Miter Gears M MS G 2-20 R

Transcription

1 MMSG Ground Spiral SMSG Ground Spiral MMSA MMSB Finished Bore Spiral ~ 4 Page 424 ~ 5 Page 42 m ~ 0 Page 42 MMS Spiral SMS Spiral SMZG Ground Zerol Newly added ~ 5 Page 4 m ~ Page 432 New ~ 3 Page 434 SMA SMB SMC Finished Bore MM Carburized & Hardened M Sintered Metal acks m ~ Page 43 SM Steel Newly added ~ 5 Page 43 SAM Angular m0. ~.5 Page 43 SUM Stainless Steel Catalog Number of KHK Stock The Catalog Number for KHK stock gears is based on the simple formula listed below. Please order KHK gears by specifying the Catalog Numbers. (Example) M MS G 2 - CP acks m ~ Page 4 m.5 ~ 3 Page 442 m ~ 4 Page 444 Direction of Spiral ( ) No. of teeth () SUMA Finished Bore Stainless Steel PM Plastic DM Injection Molded Module (2) s (Ground Gear) Type (Spiral Gear) Material (SCM) m ~ 4 Page 444 BB Sintered Metal Bushings m ~ 4 Page 44 Nissei KSP Ground Spiral m0.5 ~.5 Page 44 Material Type S SC M Straight M SCM MS Spiral SU SUS3 AM Angular SMF P MC90 Information D DUACON G Ground φ5 ~ Page 447 m.5 ~ Page 4 Feature Icons KHK products are available from MAYAND METICS P.O. Box 2 Owings Mills, MD 27 USA ph: ()35-3 (00)3- fx: () (00) [email protected] FQ form: ohs Compliant Product e-machinable Product Finished Product Heat Treated Product Ground Gear Stainless Product esin Product Copper Alloy Product Injection Molded Product Black Oxide coated Product 49

2 Characteristics gears are a special class of bevel gears where the shafts intersect at 90 and the gear ratio is :. KHK stock miter gears are available in two types, spiral and straight tooth, with high precision grade for demanding torques and speeds, and commercial grade for economical applications. The following table lists the main features for easy selection. Type Module No. of Teeth ( ) Shaft Angle Material Heat Treatment Tooth Surface Finish Precision JIS B 704 Secondary Operations Features Spiral MMSG 2 ~ 4 SCM SMSG 2 ~ 5 SC Carburized Note Gear teeth induction hardened Ground 2 Ground 2 MMSA MMSB ~ 0 SCM Carburized Cut 4 MMS 2 ~ 5 SCM SMS ~ SC Carburized Note Gear teeth induction hardened Cut 4 Cut 4 High strength, abrasion-resistant and compact for high speed & torque use. easonably priced ground gear, yet remachinable except for the gear teeth. eady to use without performing secondary operations. Strong and abrasion resistant. Only teeth are induction hardened, allowing user to perform secondary operations elsewhere. arge numbers of teeth and modules are offered in these affordable spiral miter gears. Zerol miter gears SMZG 2 ~ 3 SC Gear teeth induction hardened Ground 2 A spiral miter gear with a helix angle less than 0. eceives forces from the same direction as straight miter gears receive and have excellent precision properties.. SMA SMB SMC ~ SC Gear teeth induction hardened Cut 4 Usable without remachining, offered in 3 bore sizes. MM 2 ~ 5 SCM Carburized Note Cut 4 Compared to SM miters, these are stronger and less abrasive, and allow secondary operations. Straight M 0. ~.5 SMF (Equiv. to SC) Sintered 5 Mass-produced, low cost sintered products. Small and light weight. SM ~ SC Cut 3 Popular straight miter for many uses. SAM.5 ~ 3 ( 0 ) SC Cut 3 SUM ~ 4 SUS3 Cut 3 SUMA ~ 4 SUS3 Cut 3 3 types are available for shafts at, 0 and. Suitable for food machinery due to SUS3 s rust-resistant quality. Stainless steel products, usable without remachining. NOTE PM ~ 4 MC90 Cut 4 DM 0.5 ~.5 DUACON (M90-44) Although these are carburized products, secondary operations can be performed as the bore and the hub portions are masked during the carburization. However, as a precaution, high hardness (HC at maximum) occurs in some cases. Injection Molded MC nylon products are light and can be used without lubricant. Injection molded, mass-produced products, suitable for office machines. Possible Partly Possible Not possible We use Crowning method for gear cutting KHK utilizes Gleason Coniflex No.04, 02 and 4 bevel gear generating machinery, also equipped for mass production of straight miter gears. You can count on a stable supply of economically priced straight miter gears from KHK Coniflex Crowning Gleason Coniflex No.04 4

3 KHK Technical Information Selection Hints Please select the most suitable products by carefully considering the characteristics of items and contents of the product tables. It is also important to read all applicable CAUTION notes shown below before the final selection.. Caution in Selecting the Mating Among KHK stock miter gears, there are products which are not interchangeable even when the module and the number of teeth are the same. Also, spiral miter gears require additional consideration since the right-hand mates with the left-hand spiral as shown in the table below. Straight ( Allowable Not allowable) SMA SMB MM SM SUM SUMA PM DM M SAM SMC SMA SMB SMC MM SM SUM SUMA PM DM M SAM ight () eft () Spiral ( Allowable Allowable in certain cases Not allowable) Series MMSG SMSG MMSA MMSB MMS SMS Series Spiral hand MMSG SMSG MMSA MMSB MMS SMS CAUTION For selecting items in the " " category, please reconfirm with your nearest KHK dealer that the pair can work. 2. Caution in Selecting Based on Gear Strength The gear strength values shown in the product pages were computed by assuming a certain application environment. Therefore, they should be used as reference only. We recommend that each user computes their own values by applying the actual usage conditions. To learn more about the strength calculations, please refer to the technical information contained in the Bending Strength of section on page 79, and the Surface Durability of section on page 5. Calculation assumptions for Bending Strength of Item MMSG MMSA MMSB MMS MM SMSG SMZG SMS SMA SMB SMC SM SAM SUM SUMA M NOTE 3 Formula NOTE Formula of bevel gears on bending strength (JGMA3-0) The ewis formula No. of teeth of mating gear Same number of teeth --- otation 00rpm(00rpm for MMSG, SMSG and SMZG) 00rpm Durability Over 0 7 cycles --- Impact from motor Uniform load Allowable bending stress(kgf/mm 2 ) Impact from load Direction of load Uniform load Bidirectional Allowable bending stresss at root σ Flim (kgf/mm 2 ) NOTE Safety factor K.2 Formula NOTE Kinematic viscosity of lubricant Gear support Formula of bevel gears on bending strength(jgma4-0) 00cSt( ) Shafts & gear box have normal stiffness, and gears are supported on one end Allowable Hertz stress σ Hlim (kgf/mm 2 ) Safety factor C.5 PM.5 ( with No ubrication) Calculation assumptions for Surface Durability (Except those in common with bending strength) DM m m m m.5. NOTE 3 ( with Grease ubrication) NOTE The gear strength formula is based on JGMA (Japanese Gear Manufacturers Association) specifications, MC Nylon Technical Data by Nippon Polypenco imited and Duracon Gear Data by Polyplastic Co. The units for the number of rotations (rpm) and the the stress (kgf/mm 2 ) are adjusted to the units needed in the formula. NOTE 2 Since the load is bidirectional, the allowable bending stress at root σ Flim, used in JGMA 3-0 formula is set to 2/3 of the value. NOTE 3 The values of the allowable bending stresses for DM m.5 and the allowable root bending stress for M gears are our own estimates. 42

4 Application Hints In order to use KHK stock gears safely, carefully read the Application Hints before proceeding. If there are questions or you require clarifications, please contact our technical department or your nearest distributor. KHK Co., td. TE FAX Points of Caution in Assembling Since miter gears are cone shaped, they produce axial thrust forces. Specifically with regard to spiral miter gears, the directions of thrust change with the hand of spiral and the direction of rotation. This is illustrated below. The bearings must be selected properly to be able to handle these thrust forces. For more technical information see the section Gear Forces (Page 99).. Caution on Performing Secondary Operations If you are reboring, it is important to pay special attention to locating the center in order to avoid runout. 2 The reference datum for gear cutting is the bore. Therefore, it is best to use the bore for locating the center. If it is too difficult to do for small bores, the alternative is to use one spot on the bore and the runout of the side surface. 3 If reworking using scroll chucks, we recommend the use of new or rebored jaws for improved precision. Please exercise caution not to crush the teeth by applying too much pressure. Any scarring will cause noise during operation. Thrust Thrust Thrust Drive Drive Thrust Thrust Thrust Thrust Thrust athe operations 4 For items with induction hardened teeth, such as SMSG and SMS series, the hardness is high near the tooth root. When machining the front face, the machined area should be 4 to mm smaller than the dimension, J. 2 If a miter gear is mounted on a shaft far from the bearings, the shaft may bend. We recommend mounting bevel gears as close to the bearings as possible. This is especially important since most miter gears are supported on one end. The bending of shafts will cause abnormal noise and wear, and may even cause fatigue failure of the shafts. Both shafts and bearings must be designed with sufficient strength. Example of Assembling 5 For tapping and keyway operations, see the examples given in. Caution on Performing Secondary Operations in KHK Stock Gear section. When cutting keyways, to avoid stress concentration, always leave radii on corners. PM plastic miter gears are susceptible to changes due to temperature and humidity. Dimensions may change between during and after remachining operations. 7 When heat-treating SC products, it is possible to get thermal stress cracks. It is best to subject them to penetrant inspection afterwards. If tooth strength is not sufficient, it can be increased approximately four times by heat-treating. On the other hand, the precision of the gear will drop about one grade. 3 Due to the thrust load of miter gears, the gears, shafts and bearings have the tendency to loosen up during operation. gears should be fastened to the shaft with keys and set screws, taper pins, step shafts, etc. 4 When installing MMSA or MMSB finished bore spiral miter gears in B7 style (ring type), always secure the gears onto the mounting base with taper pins to absorb the rotational loads. It is dangerous to secure with bolts only. Gear Mounting base Taper pin 422

5 KHK Technical Information 5 KHK stock miter gears are designed such that, when assembled according to the specified mounting distance with a tolerance of H7 to H, the backlash shown in the table are obtained. Mounting distance error, offset error and shaft angle error must be minimized to avoid excessive noise and wear. Inaccurate assembly will lead to irregular noises and uneven wear. Various conditions of teeth contact are shown below. Correct Tooth Contact When assembled correctly, the contact will occur on both gears in the middle of the flank and center of face width but somewhat closer to the toe. Center contact closer to toes Mounting Distance Error When the mounting distance of the pinion is incorrect, the contact will occur too high on the flank on one gear and too low on the other. ow contact High contact Error Incorrect Tooth Contact Offset Error When the pinion shaft is offset, the contact surface is near the toe of one gear and near the heel of the other. Heel contact Error Shaft Angle Error When there is an angular error of shafts, the gears will contact at the toes or heels depending on whether the angle is greater or less than 90. Error Toe contact Toe contact High contact ow contact Error Toe contact Error Heel contact Error Heel contact Application Examples Electric components assembly line ( gears <SM and PM>) Automatic packaging machine ( gears - inset) 423

6 MMSG Ground Spiral Module 2 ~ 4 Specifications Precision grade JIS B 704 grade 2 Gear teeth Gleason G Pressure angle Helix angle 35 Material SCM G Heat treatment Carburizing acks CP acks Gear ratio Module No. of teeth Direction of spiral MMSG2- MMSG2- MMSG2.5- MMSG2.5- MMSG3- MMSG3- MMSG3.5- MMSG3.5- MMSG4- MMSG4- MMSG2- MMSG2- MMSG2.5- MMSG2.5- MMSG3- MMSG3- MMSG3.5- MMSG3.5- MMSG4- MMSG4- MMSG2- MMSG2- MMSG2.5- MMSG2.5- MMSG3- MMSG3- MMSG3.5- MMSG3.5- MMSG4- MMSG4- [Caution on Product Characteristics].5 m3 m3.5 m4.5 m3 m3.5 m4.5 m3 m3.5 m4 Tooth hardness 55 ~ 0HC Shape Bore Hub dia. Pitch dia. Outside dia. Mounting distance Total length Crown to back length AH7 B C D E F G B B B B B B B B B B B B A sets of miter gears must be identical in module and number of teeth, but opposite in spiral hands. 2 The allowable torques shown in the table are the calculated values according to the assumed usage conditions. Please see page 42 for more details. 3 Dimensions of the outside diameter, the overall length and crown to back length are all theoretical values, and some differences will occur due to the corner chamfering of the gear tips. 4 These gears produce axial thrust forces. See page 422 for more details. 424

7 Ground Spiral MMSG G G B4 Hub width ength of bore Face width Holding surface dia. Allowable torque (N m) Allowable torque (kgf m) Backlash H I J K Bending strength Surface durability Bending strength Surface durability ~ ~ ~ ~ acks CP acks ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ [Caution on Secondary Operations] (mm) Weight (kg) MMSG2- MMSG2- MMSG2.5- MMSG2.5- MMSG3- MMSG3- MMSG3.5- MMSG3.5- MMSG4- MMSG4- MMSG2- MMSG2- MMSG2.5- MMSG2.5- MMSG3- MMSG3- MMSG3.5- MMSG3.5- MMSG4- MMSG4- MMSG2- MMSG2- MMSG2.5- MMSG2.5- MMSG3- MMSG3- MMSG3.5- MMSG3.5- MMSG4- MMSG4- Please read Caution on Performing Secondary Operations (Page 422) when performing modification and/or secondary operations for safety concerns. Haguruma Kobo, the KHK's system for quick modification of KHK stock gears is also available. 2 In the illustration, the area surrounded with line is masked during the carburization process and can be modified. However, care should be exercised since the hardness is high (approx. HC, maximum). Inquiries are now being accepted on our website. 4

8 SMSG Ground Spiral Module 2 ~ 5 acks CP acks Specifications Precision grade JIS B 704 grade 2 Gear teeth Pressure angle Helix angle 35 Material Gear ratio Module No. of teeth SMSG2- SMSG2- SMSG2.5- SMSG2.5- SMSG3- SMSG3- SMSG3.5- SMSG3.5- SMSG4- SMSG4- SMSG5- SMSG5- SMSG2- SMSG2- SMSG2.5- SMSG2.5- SMSG3- SMSG3- SMSG3.5- SMSG3.5- SMSG4- SMSG4- SMSG5- SMSG5- SMSG2- SMSG2- SMSG2.5- SMSG2.5- SMSG3- SMSG3- SMSG3.5- SMSG3.5- SMSG4- SMSG4- [Caution on Product Characteristics].5 m3 m3.5 m4 m5.5 m3 m3.5 m4 m5.5 m3 m3.5 m4 Gleason SC Heat treatment Teeth induction hardened Tooth hardness ~ 55HC Direction of spiral Shape G G Bore Hub dia. Pitch dia. Outside dia. Mounting distance Total length Crown to back length AH7 B C D E F G A sets of miter gears must be identical in module and number of teeth, but opposite in spiral hands. 2 The allowable torques shown in the table are the calculated values according to the assumed usage conditions. Please see page 42 for more details. 3 Dimensions of the outside diameter, the overall length and crown to back length are all theoretical values, and some differences will occur due to the corner chamfering of the gear tips. 4 These gears produce axial thrust forces. See page 422 for more details. 42

9 Ground Spiral SMSG acks CP acks Hub width ength of bore Face width Holding surface dia. Allowable torque (N m) Allowable torque (kgf m) Backlash H I J K Bending strength Surface durability Bending strength Surface durability ~ ~ ~ v ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ [Caution on Secondary Operations] (mm) Weight (kg) SMSG2- SMSG2- SMSG2.5- SMSG2.5- SMSG3- SMSG3- SMSG3.5- SMSG3.5- SMSG4- SMSG4- SMSG5- SMSG5- SMSG2- SMSG2- SMSG2.5- SMSG2.5- SMSG3- SMSG3- SMSG3.5- SMSG3.5- SMSG4- SMSG4- SMSG5- SMSG5- SMSG2- SMSG2- SMSG2.5- SMSG2.5- SMSG3- SMSG3- SMSG3.5- SMSG3.5- SMSG4- SMSG4- Please read Caution on Performing Secondary Operations (Page 422) when performing modification and/or secondary operations for safety concerns. Haguruma Kobo, the KHK's system for quick modification of KHK stock gears is also available. 2 Due to the gear teeth being induction hardened, no secondary operations can be performed on tooth areas including the bottom land (approx. to 2 mm). Inquiries are now being accepted on our website. 427

10 MMSA MMSB Finished Bore Spiral Module ~ 0 acks CP acks Gear ratio Module MMSA- MMSB- MMSA- MMSB- MMSA.5- MMSB.5- MMSA.5- MMSB.5- MMSA2- MMSB2- MMSA2- MMSB2- MMSA2.5- MMSB2.5- MMSA2.5- MMSB2.5- MMSA3- MMS- MMSA3- MMS- MMSA3.5- MMS.5- MMSA3.5- MMS.5- MMSA4- MMSB4- MMSA4- MMSB4- MMSA5- MMSB5- MMSA5- MMSB5- MMSA- MMSB- MMSA- MMSB- MMSA- MMSA- MMSA0- MMSA0- [Caution on Product Characteristics] No. of teeth m m.5.5 m3 m3.5 m4 m5 m m m0 Specifications Precision grade JIS B 704 grade 4 Gear teeth Pressure angle Helix angle 35 Material Gleason SCM Heat treatment Overall carburizing Tooth hardness 55 ~ 0HC Direction of spiral Shape BT BT BT BT B4 B4 B4 B4 B4 B4 B4 B4 B7 B7 G Bore Hub dia. Pitch dia. Outside dia. Mounting distance Total length Crown to back length Hub width ength of bore AH7 B C D E F G H I A sets of miter gears must be identical in module and number of teeth, but opposite in spiral hands. 2 The allowable torques shown in the table are the calculated values according to the assumed usage conditions. Please see page 42 for more details. 3 Dimensions of the outside diameter, the overall length and crown to back length are all theoretical values, and some differences will occur due to the corner chamfering of the gear tips. 4 These gears produce axial thrust forces. See page 422 for more details. 5 Although the dimensions of the keyway are made to the JIS (Js9) tolerance, there may be some deviations due to the effects of heat treatment. For products having a tapped hole (Except for B7-shaped products), a tapping screw is attached as an accessory. BT 42

11 MMSA MMSB Finished Bore Spiral G G G G G Face width Holding surface dia. Keyway Set Allowable torque (N m) Allowable torque (kgf m) Backlash J K Width Depth Size Bending strength Surface durability Bending strength Surface durability 2-M4 2-M [Caution on Secondary Operations] 4 x. 4 x. 5 x x x x 2.3 x 2. x 2. x 2. x 2. x 2. x 2. x 2. x 2. x 3.3 x 3.3 x 3.3 x 3.3 x 3.3 x 3.3 x 3.3 x 3.3 x x 3.3 x x 3.3 x x 3. x x 3. 2-M4 2-M4 2-M4 M5 2-M4 M5 M5 M5 M5 M5 M M M M M M M M M M M M M M M M M M M M M M M M B4 B4 (mm) ~ ~ ~ ~ ~ ~ ~ ~ ~0.3 B7 Weight (kg) M0 -M ~ M0 -M ~ MMSA- MMSB- MMSA- MMSB- MMSA.5- MMSB.5- MMSA.5- MMSB.5- MMSA2- MMSB2- MMSA2- MMSB2- MMSA2.5- MMSB2.5- MMSA2.5- MMSB2.5- MMSA3- MMS- MMSA3- MMS- MMSA3.5- MMS.5- MMSA3.5- MMS.5- MMSA4- MMSB4- MMSA4- MMSB4- MMSA5- MMSB5- MMSA5- MMSB5- MMSA- MMSB- MMSA- MMSB- MMSA- MMSA- MMSA0- MMSA0- These products which are hardened by carburizing allow no secondary machining. However, for B7 type gear, the area surrounded with line (in the illustration) is masked during the carburization process and can be modified. Care should be exercised since the hardness is high (approx. HC, maximum). acks CP acks When installing B7 type (ring type) Spiral to the base, always secure the gears onto the mounting base with taper pins to absorb the rotational loads. Fastening and securing with only mounting screws could possibly cause the screws to snap due to heavy loads. Gear Mounting base Taper pin Inquiries are now being accepted on our website. 429

12 MMS Spiral Module 2 ~ 5 Specifications Precision grade JIS B 704 grade 4 Gear teeth Gleason Pressure angle Helix angle 35 Material SCM Heat treatment Carburizing acks CP acks New items indicated in blue letters MMS2- MMS2- MMS2.5- MMS2.5- MMS3- MMS3- MMS4- MMS4- MMS5- MMS5- MMS2- MMS2- MMS2.5- MMS2.5- MMS3- MMS3- MMS4- MMS4- MMS5- MMS5- MMS2- MMS2- MMS2.5- MMS2.5- MMS3- MMS3- MMS4- MMS4- MMS5- MMS5- [Caution on Product Characteristics] Gear ratio Module No. of teeth.5 m3 m4 m5.5 m3 m4 m5.5 m3 m4 m5 Tooth hardness 55 ~ 0HC Direction of spiral Shape Bore Hub dia. Pitch dia. Outside dia. Mounting distance Total length Crown to back length AH7 B C D E F G A sets of miter gears must be identical in module and number of teeth, but opposite in spiral hands. 2 The allowable torques shown in the table are the calculated values according to the assumed usage conditions. Please see page 42 for more details. 3 Dimensions of the outside diameter, the overall length and crown to back length are all theoretical values, and some differences will occur due to the corner chamfering of the gear tips. 4 These gears produce axial thrust forces. See page 422 for more details. 4

13 MMS Spiral Newly added Hub width ength of bore Face width Holding surface dia. Allowable torque (N m) Allowable torque (kgf m) Backlash H I J K Bending strength Surface durability Bending strength Surface durability (mm) ~ ~ ~ ~ ~ ~ ~ acks CP acks ~ ~ ~ ~ ~ ~ ~ ~ [Caution on Secondary Operations] Weight (kg) New items indicated in blue letters MMS2- MMS2- MMS2.5- MMS2.5- MMS3- MMS3- MMS4- MMS4- MMS5- MMS5- MMS2- MMS2- MMS2.5- MMS2.5- MMS3- MMS3- MMS4- MMS4- MMS5- MMS5- MMS2- MMS2- MMS2.5- MMS2.5- MMS3- MMS3- MMS4- MMS4- MMS5- MMS5- Please read Caution on Performing Secondary Operations (Page 422) when performing modification and/or secondary operations for safety concerns. Haguruma Kobo, the KHK's system for quick modification of KHK stock gears is also available. 2 In the illustration, the area surrounded with line is masked during the carburization process and can be modified. However, care should be exercised since the hardness is high (approx. HC, maximum). Inquiries are now being accepted on our website. 43

14 SMS Spiral Module ~ acks CP acks Specifications Precision grade JIS B 704 grade 4 Gear teeth Pressure angle Helix angle 35 Material Gear ratio Module No. of teeth SMS- SMS- SMS.5- SMS.5- SMS2- SMS2- SMS2.5- SMS2.5- SMS3- SMS3- SMS3.5- SMS3.5- SMS4- SMS4- SMS5- SMS5- SMS- SMS- SMS- SMS- SMS- SMS- SMS.5- SMS.5- SMS2- SMS2- SMS2.5- SMS2.5- SMS3- SMS3- SMS3.5- SMS3.5- SMS4- SMS4- SMS5- SMS5- SMS- SMS- SMS- SMS- SMS.5- SMS.5- SMS2- SMS2- SMS2.5- SMS2.5- SMS3- SMS3- SMS3.5- SMS3.5- SMS4- SMS4- SMS5- SMS5- m m.5.5 m3 m3.5 m4 m5 m m m m.5.5 m3 m3.5 m4 m5 m m m.5.5 m3 m3.5 m4 m5 Gleason SC Heat treatment Teeth induction hardened Tooth hardness ~ 55HC Direction of spiral Shape Bore Hub dia. Pitch dia. Outside dia. Mounting distance Total length Crown to back length A B C D E F G [Caution on Product Characteristics] A sets of miter gears must be identical in module and number of teeth, but opposite in spiral hands. 2 The allowable torques shown in the table are the calculated values according to the assumed usage conditions. Please see page 42 for more details. 3 Dimensions of the outside diameter, the overall length and crown to back length are all theoretical values, and some differences will occur due to the corner chamfering of the gear tips. 4 These gears produce axial thrust forces. See page 422 for more details. 5 Due to heat treating, some deformation of the bore may occur. It may be necessary to ream the bore to bring it to the stated dimensions.

15 SMS Spiral Hub width ength of bore Face width Holding surface dia. Allowable torque (N m) Allowable torque (kgf m) Backlash H I J K Bending strength Surface durability Bending strength Surface durability ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ [Caution on Secondary Operations] (mm) Weight (kg) SMS- SMS- SMS.5- SMS.5- SMS2- SMS2- SMS2.5- SMS2.5- SMS3- SMS3- SMS3.5- SMS3.5- SMS4- SMS4- SMS5- SMS5- SMS- SMS- SMS- SMS- SMS- SMS- SMS.5- SMS.5- SMS2- SMS2- SMS2.5- SMS2.5- SMS3- SMS3- SMS3.5- SMS3.5- SMS4- SMS4- SMS5- SMS5- SMS- SMS- SMS- SMS- SMS.5- SMS.5- SMS2- SMS2- SMS2.5- SMS2.5- SMS3- SMS3- SMS3.5- SMS3.5- SMS4- SMS4- SMS5- SMS5- Please read Caution on Performing Secondary Operations (Page 422) when performing modification and/or secondary operations for safety concerns. Haguruma Kobo, the KHK's system for quick modification of KHK stock gears is also available. 2 Due to the gear teeth being induction hardened, no secondary operations can be performed on tooth areas including the bottom land (approx. to 2 mm). acks CP acks Inquiries are now being accepted on our website. 433

16 SMZG Ground Zerol Module 2 ~ 3 Specifications Precision grade JIS B 704 grade 2 Gear teeth Gleason G Pressure angle Material SC Heat treatment Teeth induction hardened Tooth hardness ~ 55HC acks CP acks New items indicated in blue letters Gear ratio Module No. of teeth SMZG2- SMZG2- SMZG2.5- SMZG2.5- SMZG3- SMZG3- [Caution on Product Characteristics] Helix angle m3 5 Direction of spiral Shape Bore Hub dia. Pitch dia. Outside dia. Mounting distance Total length Crown to back length A B C D E F G A set of miter gears must be identical in module and number of teeth, but opposite in spiral hands. 2 Allowable torques shown in the table are the calculated values according to the assumed usage conditions. Please see page 42 for more details. 3 Dimensions of the outside diameter, the overall length and crown to back length are all theoretical values, and some differences will occur due to the corner chamfering of the gear tips. 4 It produces an axial thrust force, which has the same direction as straight bevel gears. For details, see page 700. Features of Zerol Zerol are spiral miter gears with a helix angle of less than 0 degree. Balanced, and good in performance as they combine the features of straight / spiral bevel gears. Allows compact design as no inward thrust force ( * eference to the figure) is produced, which causes problems on spiral miter gears. Unlike straight miter gears, grounding can be applied to Zerol, allowing higher precision, wear-resistance and are quieter, compared with straight miter gears. eplacements for SM can easily be made due to the gears have similar dimensions for the mounting distance. When replacing, please use a set of zerol miter gears with opposite spiral hands, one right-hand and the other left-hand. Performance Comparison Gear Type Bearing Design * Interchangeability SM2- Ground Zerol Mounting Distance Precision JIS B 704 Strength Bending Strength Durability Surface Durability Noise/Vibration Surface oughness/total Contact atio Price for single item Easy Many Normal Normal Bad Normal ow No thrust force produced inward SUM PM SMZG grade 3 7.3N m 0.72N m 3.2a/.2 Easy Many Good Normal Good ow Normal SMZG2-/ Ground Spiral MMSG2-/ No thrust force produced inward SM SUM PM grade 2 7.7N m 4.N m 0.4a/.74 Difficult None Good Strong Good ow Normal Thrust force produced inward ー grade 2 5.N m 2.7N m 0.4a/2.49 NOTE: The above evaluations were based on a comparison of 3 products. 434

17 SMZG Ground Zerol New Prodects acks CP acks Hub width ength of bore Face width Holding surface dia. Allowable torque (N m) Allowable torque (kgf m) Backlash H I J K Bending strength Surface durability Bending strength Surface durability ~ ~ ~ [Caution on Secondary Operations] (mm) Weight (kg) New items indicated in blue letters SMZG2- SMZG2- SMZG2.5- SMZG2.5- SMZG3- SMZG3- Care must be exercised when performing modification and/or secondary operations of miter gears. Haguruma Kobo, the KHK's system for quick modification of KHK stock gears is also available. 2 Due to gear teeth induction hardened, no secondary operations can be performed on tooth areas including the bottom land (approx. to 2 mm). Inquiries are now being accepted on our website. 435

18 SMA SMB SMC Finished Bore Module ~ acks CP acks No. of teeth Specifications Precision grade JIS B 704 grade 4 Gear teeth Pressure angle Helix angle Material Gleason SC Heat treatment Teeth induction hardened Tooth hardness ~ 55HC Bore Hub dia. Pitch dia. Outside dia. Mounting distance Total length Crown to back length Hub width ength of bore Gear ratio Module Shape AH7 B C D E F G H I SMA- BT m SMB- BT 0.07 SMA.5- BT 0 9 m SMB.5-9 SMA SMB SMA SMB SMA SM- m SMC3-35 SMA3.5-2 m SM.5- SMA4- SMB4- m SMC4- SMA5-54 SMB5- m SMC SMA- 0 SMB- m SMC- 0 SMA- m SMA- m BT SMA.5- m SMA2- SMB SMA SMB SMA3- m3 SM SMA m3.5 SM SMA4-35 m4 SMB SMA5- m SMA- m SMA- m SMA.5- m SMA2- SMB SMA SMB SMA3-32 m3 SM SMA m3.5 SM SMA4- m4 SMB SMA5- m [Caution on Product Characteristics] For products with a tapped hole, a set screw is included. 2 The allowable torques shown in the table are the calculated values according to the assumed usage conditions. Please see page 42 for more details. 3 Dimensions of the outside diameter, the overall length and crown to back length are all theoretical values, and some differences will occur due to the corner chamfering of the gear tips. 4 The keyway dimensions of items with " "marks do not conform to JIS Standards. BT 43

19 SMA Finished Bore Gear Face width Holding surface dia. Keyway Set Allowable torque (N m) Allowable torque (kgf m) Backlash J K Width Depth Size Bending strength Surface durability Bending strength Surface durability (mm) (kg) 5 9. M4 0.0 SMA ~0.3 0 M SMB M SMA ~ x. M5 0.0 SMB x 2.3 M5 0.4 SMA ~ x 2.3 M5 0.3 SMB x 2.3* M 0.27 SMA ~ x 2. M 0.2 SMB x 3* M 0.47 SMA x 3* M ~ SM x 2. M 0.49 SMC x 3* M 0.7 SMA ~ x 3.3 M 0. SM x 3* M.00 SMA x 3.3 M ~ SMB x 3.3 M.07 SMC x 3.3* M.0 SMA x 3.3 M ~ SMB x 3.3 M.93 SMC5-7.5 x 3.3* M 3.9 SMA x 3. M ~ SMB- 7.5 x 3.3 M 3.35 SMC x 4.4 M ~ SMA M ~ SMA x. M ~ SMA x 2. M 0.9 SMA ~0. 5 x 2.3 M5 0. SMB x 2.3* M 0.39 SMA ~0.7 x 2. M 0. SMB x 3* M 0.3 SMA ~0. x 3.3 M 0.9 SM x 3.3 M.04 SMA ~0. x 3.3 M.09 SM x 3.3 M.59 SMA ~0.27 x 3.3 M. SMB4-5.5 x 3.3* M ~ SMA x 4.3 M ~ SMA x. M ~ SMA x 2.3 M ~ SMA x 2. M 0.32 SMA ~0. 5 x 2.3 M SMB x 3.3 M 0. SMA ~0.7 x 2. M 0.73 SMB x 3.3 M.5 SMA ~0. x 3.3 M. SM x 3.3 M 2.0 SMA ~0. x 3.3 M 2.0 SM x 3.3 M 2. SMA ~0.27 x 3.3 M 3.03 SMB x 4.3 M ~ SMA5- [Caution on Secondary Operations] Please read Caution on Performing Secondary Operations (Page 422) when performing modification and/or secondary operations for safety concerns. Haguruma Kobo, the KHK's system for quick modification of KHK stock gears is also available. 2 Due to the gear teeth being induction hardened, no secondary operations can be performed on tooth areas including the bottom land (approx. to 2 mm). Weight acks CP acks Inquiries are now being accepted on our website. 437

20 MM Carburized & Hardened Module 2 ~ 5 Specifications Precision grade JIS B 704 grade 4 Gear teeth Gleason Pressure angle Material SCM Heat treatment Carburizing Tooth hardness 55 ~ 0HC New items indicated in blue letters Gear ratio Module No. of teeth Shape Bore Hub dia. Pitch dia. Outside dia. Mounting distance Total length Crown to back length Hub width AH7 B C D E F G H MM2- MM2.5- MM3- MM4- MM5-.5 m3 m4 m acks CP acks MM2- MM2.5- MM3- MM4- MM5- MM2- MM2.5- MM3- MM4- MM5-.5 m3 m4 m5.5 m3 m4 m [Caution on Product Characteristics] The allowable torques shown in the table are the calculated values according to the assumed usage conditions. Please see page 42 for more details. 2 Dimensions of the outside diameter, the overall length and crown to back length are all theoretical values, and some differences will occur due to the corner chamfering of the gear tips. M Sintered Metal Module 0. ~.5 Specifications Precision grade JIS B 704 grade 5 Gear teeth Gleason Pressure angle Material SMF Heat treatment Tooth hardness 70 ~ 95HB Gear ratio Module M0.- M- M.- M.5- m0. m m. m.5 No. of teeth Shape B B B B Bore Hub dia. Pitch dia. Outside dia. Mounting distance Total length Crown to back length Hub width AH B C D E F G H B [Caution on Product Characteristics] The allowable torques shown in the table are the calculated values according to the assumed usage conditions. Please see page 42 for more details. 2 Steam treatment (an effect creating surface oxidation) provides rust prevention; however, it is not a complete solution. 3 Although the sintering process allows for the inclusion of oil to maintain lubrication, these gears have not been oil impregnated. 43

21 MM Carburized & Hardened Newly added acks CP acks ength of bore Face width Holding surface dia. Allowable torque (N m) Allowable torque (kgf m) Backlash I J K Bending strength Surface durability Bending strength Surface durability (mm) 0.0~ ~ ~0. 0.~ ~0.34 Weight (kg) New items indicated in blue letters MM2- MM2.5- MM3- MM4- MM ~ ~ ~0. 0.~ ~ ~ ~ ~0. 0.~ ~ MM2- MM2.5- MM3- MM4- MM5- MM2- MM2.5- MM3- MM4- MM5- [Caution on Secondary Operations] Please read Caution on Performing Secondary Operations (Page 422) when performing modification and/or secondary operations for safety concerns. Haguruma Kobo, the KHK's system for quick modification of KHK stock gears is also available. 2 In the illustration, the area surrounded with line is masked during the carburization process and can be modified. However, care should be exercised since the hardness is high (approx. HC, maximum). M Sintered Metal ength of bore Face width Holding surface dia. Allowable torque (N m) Allowable torque (kgf m) Backlash I J K Bending strength Surface durability Bending strength Surface durability (mm) ~0. 0~0. 0~0. 0~0.22 Weight (kg) M0.- M- M.- M.5- [Caution on Secondary Operations] Please read Caution on Performing Secondary Operations (Page 422) when performing modifications and/or secondary operations for safety concerns. Haguruma Kobo, the KHK's system for quick modification of KHK stock gears is also available. Inquiries are now being accepted on our website. 439

22 SM Steel Module ~ Specifications Precision grade JIS B 704 grade 3 Gear teeth Gleason Pressure angle Material Heat treatment SC Tooth hardness less than 94HB acks CP acks Gear ratio Module SM2- SM2.5- SM3- SM4- SM5- SM- SM.- SM.5- SM2- SM2.5- SM3- SM3.5- SM4- SM5- SM-.5 m3 m4 m5 m m. m.5.5 m3 m3.5 m4 m5 m No. of teeth Shape B2 B2 B2 B2 B2 Bore Hub dia. Pitch dia. Outside dia. Mounting distance Total length Crown to back length Hub width AH7 B C D E F G H SM- m SM- SM.- SM.5- SM2- SM2.5- SM3- SM3.5- SM4- SM5- SM- SM- SM.- SM.5- SM2- SM2.5- SM3- SM3.5- SM4- SM5- [Caution on Product Characteristics] m m. m.5.5 m3 m3.5 m4 m5 m m m. m.5.5 m3 m3.5 m4 m B The allowable torques shown in the table are the calculated values according to the assumed usage conditions. Please see page 42 for more details. 2 Dimensions of the outside diameter, the overall length and crown to back length are all theoretical values, and some differences will occur due to the corner chamfering of the gear tips

23 SM Steel ength of bore Face width Holding surface dia. Allowable torque (N m) Allowable torque (kgf m) Backlash I J K Bending strength Surface durability Bending strength Surface durability (mm) Weight (kg) ~ ~ ~0. 0.~ ~ SM2- SM2.5- SM3- SM4- SM ~ ~ ~ ~ ~ ~0. 0.0~0. 0.~ ~ ~ SM- SM.- SM.5- SM2- SM2.5- SM3- SM3.5- SM4- SM5- SM ~ SM [Caution on Secondary Operations] ~ ~ ~ ~ ~ ~0. 0.0~0. 0.~ ~ ~ ~ ~ ~ ~ ~ ~0. 0.0~0. 0.~ ~ SM- SM.- SM.5- SM2- SM2.5- acks CP acks SM3- SM3.5- SM4- SM5- SM- SM- SM.- SM.5- SM2- SM2.5- SM3- SM3.5- SM4- SM5- Please read Caution on Performing Secondary Operations (Page 422) when performing modifications and/or secondary operations for safety concerns. Haguruma Kobo, the KHK's system for quick modification of KHK stock gears is also available. Inquiries are now being accepted on our website. 44

24 SAM Angular Module Specifications Precision grade JIS B 704 grade 3 Gear teeth Gleason Pressure angle Material Heat treatment SC Tooth hardness less than 94HB 22.5 acks CP acks Gear ratio Module SAM.5-0 SAM2-0 SAM2.5-0 SAM3-0 SAM.5-00 SAM2-00 SAM SAM3-00 SAM.5- SAM2- SAM2.5- SAM3- [Caution on Product Characteristics] Shaft angle m.5.5 m3 m.5.5 m3 m.5.5 m3 No. of teeth Shanft angle Shape B B B B B0 B0 B0 B0 B B B B B Bore Hub dia. Pitch dia. Outside dia. Mounting distance Total length Crown to back length AH7 B C D E F G The allowable torques shown in the table are the calculated values according to the assumed usage conditions. Please see page 42 for more details. 2 Dimensions of the outside diameter, the overall length and crown to back length are all theoretical values, and some differences will occur due to the corner chamfering of the gear tips. Shaft angle 0 Shaft angle 442

25 SAM Angular 0 B0 B Hub width ength of bore Face width Holding surface dia. Allowable torque (N m) Allowable torque (kgf m) Backlash H I J K Bending strength Surface durability Bending strength Surface durability [Caution on Secondary Operations] Angular (mm) 0.05~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~0. Weight (kg) acks CP acks SAM.5-0 SAM2-0 SAM2.5-0 SAM3-0 SAM.5-00 SAM2-00 SAM SAM3-00 SAM.5- SAM2- SAM2.5- SAM3- Please read Caution on Performing Secondary Operations (Page 422) when performing modifications and/or secondary operations for safety concerns. Haguruma Kobo, the KHK's system for quick modification of KHK stock gears is also available. The shafts of standard are at 90, with other angles are called Angular. SAM series of KHK standard Angular are available with, 0, 90 and shaft angles. shaft angles may be ordered as custom gears. However, because of the limitations of our manufacturing equipment, we may not be able to produce your specific design Shaft Angle Shaft Angle 0 Shaft Angle 90 Shaft Angle Inquiries are now being accepted on our website. 443

26 SUM Stainless Steel Module ~ 4 Specifications Precision grade JIS B 704 grade 3 Gear teeth Gleason Pressure angle Material SUS3 Heat treatment Tooth hardness less than 7HB acks CP acks Gear ratio Module SUM- SUM.5- SUM2- SUM2.5- SUM3- SUM4- SUM- SUM.5- SUM2- SUM2.5- SUM3- SUM4- [Caution on Product Characteristics] SUMA m m.5.5 m3 m4 m m.5.5 m3 m4 Finished Bore Stainless Steel Gear ratio Module SUMA- SUMA.5- SUMA2- SUMA2.5- SUMA3- SUMA4- SUMA- SUMA.5- SUMA2- SUMA2.5- SUMA3- SUMA4- m m.5.5 m3 m4 No. of teeth No. of teeth Specifications Precision grade JIS B 704 grade 3 Gear teeth Pressure angle Material Shape Heat treatment Gleason SUS3 Tooth hardness less than 7HB Shape Bore Hub dia. Pitch dia. Outside dia. Mounting distance Total length Crown to back length Hub width AH7 B C D E F G H Module ~ The allowable torques shown in the table are the calculated values according to the assumed usage conditions. Please see page 42 for more details. 2 Dimensions of the outside diameter, the overall length and crown to back length are all theoretical values, and some differences will occur due to the corner chamfering of the gear tips. m m.5.5 m3 m Bore Hub dia. Pitch dia. Outside dia. Mounting distance Total length Crown to back length Hub width ength of bore AH7 B C D E F G H I [Caution on Product Characteristics] For products with a tapped hole, a set screw is included. 2 The allowable torques shown in the table are the calculated values according to the assumed usage conditions. Please see page 42 for more details. 3 Dimensions of the outside diameter, the overall length and crown to back length are all theoretical values, and some differences will occur due to the corner chamfering of the gear tips. 444

27 SUM Stainless Steel acks ength of bore Face width Holding surface dia. Allowable torque (N m) Allowable torque (kgf m) Backlash I J K Bending strength Surface durability Bending strength Surface durability [Caution on Secondary Operations] (mm) 0.03~ ~ ~ ~ ~0. 0.~ ~ ~ ~ ~ ~0. 0.~0.27 Weight (kg) SUM- SUM.5- SUM2- SUM2.5- SUM3- SUM4- SUM- SUM.5- SUM2- SUM2.5- SUM3- SUM4- Please read Caution on Performing Secondary Operations (Page 422) when performing modifications and/or secondary operations for safety concerns. Haguruma Kobo, the KHK's system for quick modification of KHK stock gears is also available. SUMA Finished Bore Stainless Steel CP acks Face width Holding surface dia. Keyway Set Allowable torque (N m) Allowable torque (kgf m) Backlash J K Width Depth Size Bending strength Surface durability Bending strength Surface durability (mm) x. 5 x x 2.3 x 2. 4 x. 5 x 2.3 x 2. x 3.3 M4 M4 M4 M5 M5 M5 M4 M4 M4 M5 M5 M ~ ~ ~ ~ ~0. 0.~ ~ ~ ~ ~ ~0. 0.~0.27 Weight (kg) SUMA- SUMA.5- SUMA2- SUMA2.5- SUMA3- SUMA4- SUMA- SUMA.5- SUMA2- SUMA2.5- SUMA3- SUMA4- [Caution on Secondary Operations] Please read Caution on Performing Secondary Operations (Page 422) when performing modification and/or secondary operations for safety concerns. Haguruma Kobo, the KHK's system for quick modification of KHK stock gears is also available. Inquiries are now being accepted on our website. 4

28 PM Plastic Module ~ 4 acks CP acks Gear ratio Module PM- PM.- PM.5- PM2- PM2.5- PM3- PM3.5- PM4- PM- PM.- PM.5- PM2- PM2.5- DM m m. m.5.5 m3 m3.5 m4 m m. m.5.5 No. of teeth Specifications Precision grade JIS B 704 grade 4 * Gear teeth Pressure angle Material Injection Molded Heat treatment Gleason MC90 Tooth hardness 5 ~ H * The precision grade of this product is equivalent to the value shown in the table. Shape Bore Hub dia. Pitch dia. Outside dia. Mounting distance Total length Crown to back length Hub width A B C D E F G H PM3- m [Caution on Product Characteristics] Significant variations in temperature or humidity can cause dimensional changes in plastic gears (MC Nylon gears), including bore size (H when produced), tooth diameter, and backlash. Please see the section Design of Plastic in the technical reference (Page 93). 2 The allowable torques shown in the table are calculated values according to the assumed usage conditions. Please see page 42 for more details. 3 Dimensions of the outside diameter, the overall length and crown to back length are all theoretical values, and some differences will occur due to the corner chamfering of the gear tips. 4 Without lubrication, using plastic gears in pairs may generate heat and dilation. It is recommended to mate with steel gears. Specifications Precision grade JIS B 704 grade Gear teeth Pressure angle Material Heat treatment Gleason Duracon(M90-44) Tooth hardness 0 ~ H Module 0.5 ~.5 B Gear ratio Module No. of teeth Shape DM0.5- DM0.- DM- DM.5- [Caution on Product Characteristics] [Caution on Secondary Operations] Hub width ength of bore Face width Holding surface dia. Allowable torque (N m) Allowable torque (kgf m) Backlash H I J K Bending strength Bending strength (mm) m0.5 m0. m m B B B B Bore Hub dia. Pitch dia. Outside dia. Mounting distance Total length Crown to back length AH7 B C D E F G The allowable torques shown in the table are the calculated values according to the assumed usage conditions. Please see page 42 for more details. 2 The bore tolerance is generally to -0. but may be + values at the central portion of the hole. 3 To find the dimensional tolerance of these gears, please see the Dimensional Tolerance Table. Avoid performing secondary operations as reworking material may expose air bubbles (voids) ~ ~0. 0.0~0. 0.0~0. Weight (kg) ange DM0.5- DM0.- DM- DM.5- Dimensional tolerance table(unit : mm) Tolerance below 3 mm ± 0. 3 up to mm ± 0. up to 0 mm ± 0. 0 up to mm ± 0.35 up to mm ± 0. mm up ± 0.

29 PM Plastic ength of bore Face width Holding surface dia. Allowable torque (N m) Allowable torque (kgf m) Backlash I J K Bending strength Surface durability Bending strength Surface durability BB Sintered Metal Bushings (mm) 0~0.23 0~0.24 0~0. 0~0.2 0~0.27 0~0.2 0~0. 0~0.32 0~0.23 0~0.24 0~0. 0~0.2 0~0.27 Weight (kg) PM- PM.- PM.5- PM2- PM2.5- PM3- PM3.5- PM4- PM- PM.- PM.5- PM2- PM ~ PM3- [Caution on Secondary Operations] Please read Caution on Performing Secondary Operations (Page 422) when performing modifications and/or secondary operations for safety concerns. Haguruma Kobo, the KHK's system for quick modification of KHK stock gears is also available. 2 Plastic gears are susceptible to the effects of temperature and moisture. Dimensional changes may occur while performing secondary operations and during post-machining operations. acks CP acks The table shows a series of standard metal bushings that can be pressed into standard Injection Molded. They can be used as bearing metal on idler gears or to reduce the bore of the gears. T B07 B00 BB09 BB4 I.D. of bushing O.D. of bushing ength that can use the bushing d 0 D Material : Oil impregnated sintered bronze DM0. DM DM DM.5 Inquiries are now being accepted on our website. 447

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