KHK Worm Gears Catalogue - KHK - #4

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Text version of the page
IIT Worm Gear Pair
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. Use of catalog numbers when ordering will simplify and expedite the processing of your order. 1. Caution in Selecting the Mating Gears ■ The Helixes of Worms and Worm Wheels
Worms and worm wheels have either right-hand or left-hand helix. The same hand worms and worm wheels comprise sets. However, the number of threads and whether they use normal module or axial module system must also be matched. The table below shows available combinations of KHK stock worms and worm wheels.
■ Mating Worm Wheels Selection Chart
Worm
KWGDL KWGDLS
KWG
SWG
SW
SUW
Mating Worm Wheel
NOTE 1
RI
RI
R2
RI
R2
R3
RI
R2
LI
L2
RI
R2
AGDL
M
o
AG0.5~1.5 AGF
RI
o
R2
o
AG
RI
o
R2
o
R3
o
BG
RI
o
o
R2
o
o
LI
o
L2
o
CG
RI
o
o
R2
o
o
LI
o
L2
o
PG
RI
o
o
R2
o
o
DG
RI
o
o
R2
o
o
[NOTE 1] Select the same module for both members.
2. Caution in Selecting Gears Based on Gear Strength
The gear strength values shown in the product pages were computed by assuming a certain application environment as shown below. Therefore, they should be used as reference only. We recommend that each user computes their own values by applying the actual usage conditions.
■ Calculation assumptions for Surface Durability ■ Calculation assumptions for Bending Strength
"^^^^ Catalog No. Item
KWGDL-KWGDLS/AGDL KWG/AGF, SWG/AG
SW/BG
SW/CG
SUW/PG
SUW/DG
Formula note 2
Formula of worm gear's strength(JGMA405-01)
The Lewis formula
Rotations of worm
600rpm
100rpm
Allowable bending stress (kgf/mm2)
Lubricant
Lubricant for gears with proper viscosity and with anti-pressure additives
1.15 (40OC with No Lubrication)
note 3
1
(40OC with No Lubrication)
Lubrication
Oil bath
Starting condition
Starting torque less than 200% of rated torque. Less than 2 starts per hour
Durability
26000 hours
Impact from motor
Uniform load
Impact from load
Uniform load
Allowable stress factor Sdim
0.67
0.70
0.42
[NOTE 2] The gear strength formula is based on JGMA (Japanese Gear Manufacturer's Association) specifications and "MC Nylon Technical Data" by
Nippon Polypenco Limited. The units for the rotational speed (rpm) and the stress (kgf/mm2) are adjusted to the units needed in the formula. [NOTE 3] Allowable bending stress of DG worm wheel Is the value we estimated.
■ The Maximum Allowable Sliding Speed Due to Heat
Catalog No.
Max. Sliding Speed (m/s)
AGDL
*
15
AGF
*
15
AG
*
15
BG
*
5
CG
*
2.5
PG
1 (no lubrication)
The maximum allowable sliding speed for each series of worm wheels is given pn the right. Select the appropriate part by calculating the sliding speed.
Sliding speed vs (m/s)
d n
19100 cos y
:Worm pitch dia.
:Worm speed (rpm)
: Worm nominal lead angle
* JGMA405-01

pageCatalog pdf di En 2012-05-22-30