Working diagram of shock absorber
A – recoil force; B – force during compression stroke
1. To determine the performance of the shock absorber, check its operating diagram on a dynamometer stand.
2. The working diagrams are taken according to the instructions attached to the stand, after completing at least 5 working cycles, at a shock absorber working fluid temperature of 20±50°C, and a flywheel rotation speed of 60 min–1 and a stroke length of 80 mm for the front shock absorber and 100 mm for the rear.
3. The curve of the diagram should be smooth, and at the transition points (from recoil stroke to compression stroke) without sections parallel to the zero line.
4. Evaluate the results on the diagram. The rebound stroke resistance at a scale of 47 N (4.8 kgf) per 1 mm should be located from the zero line at a distance A equal to: 21–28 mm for front shock absorbers, 19–26 mm for rear shock absorbers. The highest point of the compression stroke curve at the same scale should be located from the zero line at a distance B equal to: 3.5–6.5 mm for front shock absorbers; 4.5–7.5 mm – for the rear. The control values of the ordinates on the diagrams of the front and rear shock absorbers are specified for cold shock absorbers at a shock absorber fluid temperature of 20±50°C.
5. After checking, remove the shock absorber from the stand and, if necessary, overhaul and replace damaged parts.
6. Repeat the test to ensure the shock absorber is working properly.