How to maintain the electric shock absorber
Electric vehicles are modern means of transportation, with many types and different uses. In order to ensure its good performance, it must be equipped with shock absorbers in structure. The shock absorber is an important part of the suspension of an electric vehicle. It is an important part of an electric bicycle.
First, the design principle of the shock absorber
1. What is shock absorber?
The component that acts as a damper in hydraulic throttling is called a shock absorber.
2, the role of the shock absorber
A, support body.
B, pass the road against the body's reaction.
C, to ease the impact of the body, weakening the body vibration.
D, to prevent the vehicle from jumping, to improve the grounding of the tire to the ground, and to ensure the safety of the vehicle.
3 、 the working principle of the shock absorber
The shock absorber in the up and down movement process, the cavity pressure difference between Delta P, forcing the damping oil through the damping hole or valve system, generate damping force to the damping effect.
4, in order to fully match the performance of the whole vehicle and the continuous development of the shock absorber, the inverted front reduction and oil-gas separation reduction are developed and studied. Under the action of the high pressure air chamber, it can prevent the damping characteristic from the empty course and distortion, and give full play to its shock absorption performance.
Two 、 shock absorber fault determination and maintenance
1, the shock absorber return bad
A, and the relative size of the gear train before reduction, does it cause poor back position?. If the opening of the front fork is too large, the corresponding size shim is added; if the opening of the front fork is too small, the corresponding size is corrected. Improper opening of the front fork can lead to early wear and oil leakage of the oil seal and even cause the possibility of pre reduction fracture.
B and post reduction detect upper and lower loading axle pin dimensions, whether the upper and lower dimensions are “ eight ” glyph, and then correct the corresponding size to solve. Serious “ eight character ” shape installation, easy to cause oil seal early wear, oil leakage, and even cause shock absorber fracture.
C, before the reduction in assembly size to meet the requirements of the situation, there are about 20~40mm can not return, that is normal, because of its weight due to bear.
2, shock absorber abnormal sound
A, first of all, check whether other relevant accessories of the vehicle have abnormal sound.
B, it is incorrect for some individual users to judge the shock return of the shock absorber as abnormal sound at present. As an oil shock absorber, there must be a return of oil.
C, prior to the existence of gaps in the valve system is too large, the metal percussion sound, should be judged to be abnormal sound.
There is a gap between the inner hole of the decorative cover and the small gap between the plastic lining and the damping spring in the D, so that the whistling sound of mechanical friction should be judged as abnormal sound.
3, the shock absorber soft and hard
A, the user reflects the shock absorber soft, first of all to detect other relevant parts of interference. Such as interference, mud, mud, plastic parts and other phenomena, the phenomenon is not caused by the shock absorber soft. If the replacement of the hard shock absorber can not solve the problem, only from the overall structural design of vehicles or consider the use of long shock absorbers.
B, the user reflects the shock absorption is soft, the former can be added to the appropriate length of the liner about the solution, increase the pre pressure value of the spring, but should not be too large, or else affect the safety of driving.
C, the user reflects the shock absorption soft, in some areas after-sales service to increase the shock absorber oil to temporary solution, the method is undesirable, will cause excessive internal pressure, affect the normal use of oil seals, resulting in early oil spills.
D and rear shock absorber reflect soft, adjust the gear of the rear shock absorber and increase the pre pressure value of spring, but the two sides must be consistent. Otherwise, it will affect the safety of the whole vehicle.
E, after the shock absorber reflects hard, first to detect the upper and lower shaft pin assembly size is “ eight ” font or decreasing installed at both ends of hanging ear whether interference phenomenon and the frame, and then eliminate them, otherwise it will cause the shock absorber fracture.
4 shock absorber oil leakage
A, shock absorber oil leakage judgment: static rider pressure 3-5 times shock absorber observation, oil in front fork pipe or after the reduction of the connecting rod downward flow, and the former to cut off the dust cover, the oil seal end of the oil, to determine the oil leakage. At this point, such as the front fork pipe surface quality is good, can replace the oil seal to solve, should pay attention to the installation direction of oil seal and installation notes, and later reduce the shock absorber. Before replacing parts, they must be cleaned with kerosene, filled with spare parts, injected with special damping oil or 4T engine oil instead. Oil level: fork pipe down to the bottom, the oil level and fork pipe mouth size: short before minus (center distance 500mm below), for about 85mm; long before the reduction is about 150mm.
Judge B, illusion: static pressure oil shock absorber 3-5 driver, no obvious oil dripping, just dust cover mouth has oily phenomenon, and open the dust cover, seal end surface of oil spill is false. This is the initial stage of the shock absorber, without replacing the shock absorber or oil seal, continue to use for some time, this phenomenon disappears naturally.