Screw Gears S N 1-13 R. Table of Contents. Catalog Number of KHK Stock Gears. Screw Gears. (Example) Hand of Helix (R) No. of teeth (13) Module (1)

Transcription

1 Table of Contents Special Characteristics, Points of Caution in Selecting and Using... page 78 S Steel... page 80 SU Stainless Steel... page 84 A Aluminum-Bronze... page 86 P Plastic... page 88 umber of KHK Stock The umber for KHK stock gears is based on the simple formula listed below. Please order KHK gears by specifying the umbers. 8 (Example) S 1 - Hand of Helix () o. of teeth () Module (1) Type ( ) Material (S45C) Material S S45C SU SUS A CAC70 P MC901 Type 77

2 Many Types Are Offered for Changing Gear Train Directions. Characteristics Selection Hints KHK stock screw gears come in four materials, S45C, SUS, CAC70 (formerly AlBC) and MC nylon, in modules 1~4 and numbers of teeth from to. Main Features of Types of Offered 1 In terms of materials, we offer high abrasion-resistant aluminum bronze (CAC70) A series, chemical-resistant MC nylon (MC901) P screw gears, superior antirust stainless steel (SUS) SU series and commonly used machine carbon steel (S45C) S series. The helix angle of 45 is used with both right- hand and lefthand helixes so that any direction of rotation and axial thrusts can be selected. When the same helix hand is used as a set (right with right or left with left) they can be used as a skewed shaft drive, while the opposite hand set (right with left) can be used as a parallel shaft drive. The efficiency depends on the application, but is approximately 80 to 90%. Because they have high friction, it is essential that lubrication. (gear oil JIS type, o. 5~7) is used. 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 CAUTIO notes shown below before the final selection. Since screw gears come in rightor left-hand helix, make sure to include the letter or in the catalog number when you order. 1.Caution in Selecting the Mating gears are used for offset shafts. Whether the shafts are paralleled offset or skewed offset depends on the helix hands of the mating gears. Direction of shaft Skewed shafts Parallel shafts Arrangement of helix hands H-H or H-H H-H ight () eft () Arrangements of helix hands of screw gears. Caution with egard to Special Characteristics of 1 S steel screw gears made of S45C with black oxide finish are somewhat effective in preventing rust but are not rustproof. SU stainless steel screw gears have high degrees of antitrust property, but are not totally rustproof. Due to the characteristics of MC nylon, P plastic screw gears product quality may be affected by heat or moisture absorption. 4 A aluminum-bronze screw gears material (CAC70) has the tendency to abrade and scuff when mated together. KHK recommends mating A screw gears with those of different material for the best results. 78

3 KHK Technical Information. Caution in Selecting Based on Gear Strength The allowable surface strength listed in the product pages were derived using the iemann formula as reference values (for the case of skewed offset shafts). There is paucity of data on the strength of screw gears. The values of constant K0 used in the calculations, which depend on the material of the mating gears, are our estimates. The following are the equations used. (OTE 1) Where U1=1.4d1 fz Ks U1 : allowable tangential force (n) d1 : standard pitch diameter of pinion (mm) fz : coefficient based on no. of teeth combination (see table below) Ks : coefficient based on materials and sliding d1+d a = Ks = K0 +υs Where Where K0 : coefficient based on materials combination (see table below) a = center distance υs : sliding speed (m/s) d1 = pitch diameter of pinion d = pitch diameter of gear p nd1 υs = 60000cos b Where n : rotational speed(min -1 ) β : helix angle(45 ) Application Hints In order to use KHK stock screw gears safely, read the Application Hints carefully before proceeding. Also 1. Caution on Performing Secondary Operations,. otes on Starting Operations, 4. Other Points to Consider in Applications in the spur gear section should be consulted. 1. Points of Caution in Assembling 1 KHK stock screw gears are designed to give the proper backlash when assembled using the center distance given by the formula below with a tolerance of H7~H8. The amount of backlash is given in the product table for each gear. Overall length tolerance of Total ength (mm) Tolerance Above Below Due to the helix of screw gears, they produce axial thrust forces. The bearings must be selected properly to be able to handle these thrust forces. The directions of thrust change with the hand of helix and the direction of rotation as illustrated below. OTE 1: The equations in iemann Elements of Mechanical Transmission have been converted to SI units. Value of fz Z Z K0 values depending on material combination o. Mating gear K0 The maximum allowable sliding speed o. of teeth of mating gears otation S S SU S 0.00 OTE Same no. A S of teeth 0min -1 P S 0.00 OTE OTE : K0 values of SU and P are set by KHK. Direction of rotation and thrust force CAUTIO: For parallel shaft applications, see the Application Hints for KHK Helical. 4. Other Points to Consider in the Selection Process Please see the similarly titled section for spur gears. 79

4 S Steel Modules 1~ H Shape H Module 1 o. S1 - S1 - S1 - S1 - S1 - S1 - S1-6 S1-6 S1 - S1 - Hand of helix Module o. of teeth Bore Hub dia. Pitch dia. Outside dia. Face width Hub width Total length m z AH7 B C D E F G Module S S- S- S- S- S- S- S- S- S-6 S-6 S- S Module S - S - S - S - S - S - S - S - S -6 S -6 S - S - 6 CAUTIO: For skewed shaft applications, H and H or H and H are meshed to make up a set of screw gears or crossed-helical gears. For parallel shaft applications, mesh opposite hands of helical gear sets. See the Selection Hints on page 78. CAUTIO: The maximum allowable sliding speed of S gears mated to S gears is.5 m/s due to heat buildup

5 Steel Specifications Precision grade JIS 9 grade (JIS B170-1: 1998) OD JIS 5 grade (JIS B170: 1976) Heat treatment eference section of gear ormal plane Surface treatment Black oxide Gear teeth Standard full depth Tooth surface finish Cut ormal pressure angle Datum reference surface for gear cutting Bore Helix angle 45 Secondary Operations Possible Material S45C Shape Allowable torque (.m) OTE 1 Allowable torque (kgf.m) Bending strength Surface durability Bending strength Surface durability Backlash (mm) OTE Weight (kgf) o (0.0) (0.0) (0.07) (0.14) (0.) 0.08 ~ ~ ~ ~ ~ S1 - S1 - S1 - S1 - S1 - S1 - S1-6 S1-6 S1 - S (0.0) (0.06) (0.) (0.) (0.46) (0.69) 0. ~ ~ ~ ~ ~ ~ S- S- S- S- S- S- S- S- S-6 S-6 S- S-. S (0.07) 0. ~ S - S (0.14) 0. ~ S - S (0.) 0. ~ S - S (0.49) 0. ~ S - S -. (1.0) 0.14 ~ S -6 S () 0.14 ~ S - S - OTE 1: The allowable torques shown in the table are calculated from the iemann formula. Please see the Selection Hints (page 78) for further details. OTE : The backlash values shown in the table are the theoretical values in the normal direction of a pair of identical gears in mesh. 81

6 S Steel Modules.5~4 H Shape H Module.5 o. S.5- S.5- S.5- S.5- S.5- S.5- S.5- S.5- S.5-6 S.5-6 S.5- S.5- Hand of helix Module o. of teeth Bore Hub dia. Pitch dia. Outside dia. Face width Hub width Total length m z AH7 B C D E F G Module S S - S - S - S - S - S - S - S - S -6 S -6 S - S Module 4 S4 - S S4 - S S4 - S S4 - S S4-6 S S4 - S CAUTIO: For skewed shaft applications, H and H or H and H are meshed to make up a set of screw gears or crossed-helical gears. For parallel shaft applications, mesh opposite hands of helical gear sets. See the Selection Hints on page 78. CAUTIO: The maximum allowable sliding speed of S gears mated to S gears is.5 m/s due to heat buildup. 8

7 Steel Specifications Precision grade JIS 9 grade (JIS B170-1: 1998) OD JIS 5 grade (JIS B170: 1976) Heat treatment eference section of gear ormal plane Surface treatment Black oxide Gear teeth Standard full depth Tooth surface finish Cut ormal pressure angle Datum reference surface for gear cutting Bore Helix angle 45 Secondary Operations Possible Material S45C Shape Allowable torque (.m) OTE 1 Allowable torque (kgf.m) Bending strength Surface durability Bending strength Surface durability (0.) (0.7) (0.41) (0.9) (1.91) (.8) Backlash (mm) OTE 0. ~ ~ ~ ~ ~ ~ 0.4 Weight (kgf) o. S.5- S.5- S.5- S.5- S.5- S.5- S.5- S.5- S.5-6 S.5-6 S.5- S (0.) (0.46) (0.69) () (.14) (4.6) 0.14 ~ ~ ~ ~ ~ ~ S - S - S - S - S - S - S - S - S -6 S -6 S - S - S (0.49) 0. ~ S4 - S4 -. (1.0) 0. ~ S4 - S () 0. ~ S4 - S4 -.0 (.7) 0. ~ 0.. S4 - S (6.80) 0. ~ S4-6 S (9.90) 0. ~ S4 - S4 - OTE 1: The allowable torques shown in the table are calculated from the iemann formula. Please see the Selection Hints (page 78) for further details. OTE : The backlash values shown in the table are the theoretical values in the normal direction of a pair of identical gears in mesh. 8

8 SU Stainless Steel Modules 1~ H H Shape Module 1 o. SU1 - SU1 - SU1 - SU1 - Hand of helix Module o. of teeth Bore Hub dia. Pitch dia. Outside dia. Face width Hub width Total length m z AH7 B C D E F G Module SU- SU- SU- SU- SU- SU S U Module SU - SU - SU - SU - SU - SU Module.5 SU.5- SU.5- SU.5- SU.5- SU.5- SU Module SU SU - SU - SU SU SU - CAUTIO: For skewed shaft applications, H and H or H and H are meshed to make up a set of screw gears or crossed-helical gears. For parallel shaft applications, mesh opposite hands of helical gear sets. See the Selection Hints on page

9 Stainless Steel Specifications Precision grade JIS 9 grade (JIS B170-1: 1998) OD JIS 5 grade (JIS B170: 1976) Heat treatment eference section of gear ormal plane Surface treatment Gear teeth Standard full depth Tooth surface finish Cut ormal pressure angle Datum reference surface for gear cutting Bore Helix angle 45 Secondary Operations Possible Material SUS *Available on special order: Same gears except made from SUS4. Shape Allowable torque (.m) OTE 1 Allowable torque (kgf.m) Bending strength Surface durability Bending strength Surface durability Backlash (mm) OTE Weight (kgf) o (0.0) (0.0) 0.08 ~ ~ SU1 - SU1 - SU1 - SU (0.0) (0.06) (0.) 0. ~ ~ ~ SU- SU- SU- SU- SU- SU (0.07) (0.14) (0.) 0. ~ ~ ~ SU - SU - SU - SU - SU - SU - S U (0.) (0.7) (0.41) 0. ~ ~ ~ SU.5- SU.5- SU.5- SU.5- SU.5- SU (0.) 0.14 ~ SU - SU (0.46) 0. ~ SU - SU (0.69) 0. ~ SU - SU - OTE 1: The allowable torques shown in the table are calculated from the iemann formula. Please see the Selection Hints (page 78) for further details. OTE : The backlash values shown in the table are the theoretical values in the normal direction of a pair of identical gears in mesh. 85

10 A Aluminum-Bronze Modules 1~4 Module 1 H Shape H o. A1 - A1 - A1 - A1 - Module Hand of helix Module o. of teeth Bore Hub dia. Pitch dia. Outside dia. Face width Hub width Total length m z 1 1 AH7 6 6 B C D E F G A- A- A- A- A- A Module A - A - A - A - A - A - Module A A.5- A.5- A.5- A.5- A.5- A Module A - A - A - A - A - A Module 4 A4 - A4 - A4 - A4 - A4 - A CAUTIO: For skewed shaft applications, H and H or H and H are meshed to make up a set of screw gears or crossed-helical gears. For parallel shaft applications, mesh opposite hands of helical gear sets. Please see the Selection Hints on page 78. CATUIO: The maximum allowable sliding speed of A gears mated to S gears is 5m/s due to heat buildup

11 Aluminum-Bronze Specifications Precision grade JIS 9 grade (JIS B170-1: 1998) OD JIS 5 grade (JIS B170: 1976) Heat treatment eference section of gear ormal plane Surface treatment Gear teeth Standard full depth Tooth surface finish Cut ormal pressure angle Datum reference surface for gear cutting Bore Helix angle 45 Secondary Operations Possible Material CAC70 (formerly JIS AlBC) CAUTIO: AlBC is aluminum bronze. Shape Allowable torque (.m) OTE 1 Allowable torque (kgf.m) Bending strength Surface durability Bending strength Surface durability Backlash (mm) OTE Weight 0.1 (0.0) 0.08 ~ (0.05) 0.08 ~ (kgf) o. A1 - A1 - A1 - A (0.05) 0. ~ (0.) 0. ~ (0.) 0. ~ A- A- A- A- A- A- 1. (0.11) 0. ~ (0.4) 0. ~ (0.6) 0. ~ (0.1) 0. ~ (0.46) 0.14 ~ (0.69) 0.14 ~ A - A - A - A - A - A - A.5- A.5- A.5- A.5- A.5- A.5- A.56 (0.6) 0.14 ~ (0.77) 0. ~ (1.) 0. ~ A - A - A - A - A - A (0.8) 0. ~ A4 - A (1.7) (.56) 0. ~ ~ A4 - A4 - A4 - A4 - OTE 1: The allowable torques shown in the table are calculated from the iemann formula. Please see the Selection Hints (page 78) for further details. OTE : The backlash values shown in the table are the theoretical values in the normal direction of a pair of identical gears in mesh. 87

12 P Plastic Modules ~ Module H Shape H o. P- P- P- P- P- P- P- P- Hand of helix Module o. of teeth Bore Hub dia. Pitch dia. Outside dia. Face width Hub width Total length m z A B C D E F G Module P - P - P - P - P - P - P - P P Module.5 P.5- P.5- P.5- P.5- P.5- P.5- P.5- P Module P - P P - P P - P P - P CAUTIO: For skewed shaft applications, H and H or H and H are meshed to make up a set of screw gears or crossed-helical gears. For parallel shaft applications, mesh opposite hands of helical gear sets. See the Selection Hints on page 78. CAUTIO: The quality of plastic gears (MC ylon) can be affected by the temperature and humidity. Please see page on Characteristics of Plastic for additional information. 88

13 Plastic Specifications Precision grade JIS 9 grade(jis B ) OD JIS grade 5 ( JIS B ) Material MC901 eference section of gear ormal plane Surface treatment Gear teeth Standard full depth Tooth surface finish Cut ormal pressure angle Datum reference surface for gear cutting Bore Helix angle 45 Secondary Operations Possible Shape Allowable torque (.m) OTE 1 Allowable torque (kgf.m) Bending strength Surface durability Bending strength Surface durability (0.0) (0.06) (0.) (0.) Backlash (mm) OTE 0.14 ~ ~ ~ ~ 0. Weight (kgf) o. P- P- P- P- P- P- P- P (0.07) (0.14) (0.) (0.49) 0. ~ ~ ~ ~ P - P - P - P - P - P - P - P - P (0.) (0.7) (0.41) (0.9) 0. ~ ~ ~ ~ P.5- P.5- P.5- P.5- P.5- P.5- P.5- P (0.) 0.8 ~ P - P (0.46) 0. ~ P - P (0.69) 0. ~ P - P -.04 () 0. ~ P - P - OTE 1: The allowable torques shown in the table are calculated from the iemann formula. Please see the Selection Hints (page 78) for further details. OTE : The backlash values shown in the table are the theoretical values in the normal direction of a pair of identical gears in mesh. 89