Materials for Nylon block 0GR0-052005

Table of Contents

Materials for Nylon block 0GR0-052005 of CVtech Driven Pulley

(Secondary Clutch of CFMoto Parts)

CFMOTO

Parts catalogue: CVT ASSY.

Part Name: Nylon Block

Part Number: 0GR0-052005

Other name like Driven Pulley Cam Shoe, Slider Fit, SLIDING PIECE.

The movement of Nylon block 0GR0-052005 against the Helix surface in a Driven Clutch is one kind of sliding friction.

The general common failures of Nylon block are

“Shifting not smooth and Less durability”

You can see the reason for the failed Nylon Block is its material is not good enough, as below:

Friction coefficient too high →high sliding resistance → shift not smooth
Wear too much → dimension changed → shift ratio changed → less durability
Low heat resistance → distortion →shift ratio changed → less durability
Low compression strength → distortion → shift ratio changed → less durability
Too aggressive to Aluminum-made Helix → the surface of the helix worn seriously (becomes rough, like sandpaper,) and in turn, wears the Nylon block more quickly → less durability

Friction wear testing Dr.Pulley vs OE and Aftermarket

Normal Load: 40kg

Test Temp. 130℃

Testing Speed: 250 count/min

No	Testing Cycles	Weight Loss of Weight Block	Weight Loss of counterpart	Surface of counterpart
Dr.Pulley	50,000	0.0107 g	0.0020 g	Smooth
OEM	50,000	0.0320 g	0.0104 g	Slightly Rough (small scratches)
Aftermarket	5,000*	0.0255 g	0.0625 g	Very Rough (worn seriously)

*testing stopped at 5,000 cycles, due to its wear high.

The critical properties required for the self-lubricated bearing grade part (applied for sliding friction) must involve as below: