nemu

Worm Wheels

Cast Nylon Worm Wheel

  • Cast Nylon Worm Wheelサムネイル1
  • Cast Nylon Worm Wheelサムネイル2
  • Cast Nylon Worm Wheelサムネイル1
  • Cast Nylon Worm Wheelサムネイル2

Worm Wheels are materials for reduction gears made by molding resin and metal together, and are used in EPS (electric power steering) for automobiles. There are two types: cast nylon and injection molded.

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Product Details

Features

    • High clamping force is achieved by molding engineering plastic and metal together.
    • The outer diameter of the engineering plastic can be up to 120mm. Please contact us for thickness.
    • Materials with excellent sliding and abrasion resistance are used.

Friction and wear characteristics

Rough wear* sliding wear
A B C D E
Taber wear
(Wheel CS-17)		 Taber wear
(Wheel H-22)		 sand slurry wear thrust wear
［10-6cm3/(kPa)・(m/sec)・h］		 allowed PV
［(kPa)・m/sec］
Cast nylon

13

8

57

1.2

820
6 nylon

17

9

90

2.4

490
66 nylon

19

10

78

2.1

820
Polyacetal

63

36

230

1.7

490
Steel (SS400)

100

100

100

-

-

The value for rough wear is a relative value that expresses the volume of wear in terms of steel (SS400) as 100.

Measurement conditions A, B: Taber abraser, load = 9.8N, friction count = 1,000 times
C: Sand slurry wear tester, sand slurry = 50wt% No.5 silica sand + 50wt% water, 1,200rpm x 7.5h
D: Thrust tester, no lubrication, mating material = S45C (Ra: approx. 0.5μm), P=1,960kPa, V=0.25m/sec, 20h
E: Thrust testing machine, no lubrication, mating material = S45C (Ra: approx. 0.5μm), P = gradually increased every 10 min, V = 0.24m/sec

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