Working principle of hydraulic damping shock absorber

Hydraulic shock absorber is the most commonly used shock absorber in motorcycles. Its working principle is briefly introduced.
1. Hydraulic damping rear shock absorber
The structure of the hydraulic shock absorber is basically similar to that of the suction pump, except that the upper end of the steel body of the hydraulic shock absorber is closed, and a small hole is left on the valve. When the rear wheel is impacted by the raised road surface, the cylinder barrel moves upward and the piston moves relatively downward in the inner cylinder barrel. At this time, the piston valve is flushed upward, and the oil on the lower side of the piston in the inner cylinder barrel flows to the upper side of the piston without any resistance. At the same time, this part of oil also flows into the oil chamber between the inner and outer cylinder barrels through the small hole on the bottom valve. This effectively attenuates the impact load of the concave convex Road on the vehicle. When the wheel falls over the raised ground, the cylinder barrel will also move downward, and the piston will move upward relative to the cylinder barrel. When the piston moves upward, the oil rushes open the valve at the bottom and flows to the inner cylinder barrel. At the same time, the oil on the upper side of the piston of the inner cylinder barrel flows to the lower side through the small hole on the piston valve. here
When the oil flows through the small hole, it will be subject to great resistance, which will produce better resistance
It plays an important role in shock absorption.
2. Telescopic tube front fork hydraulic shock absorber
The telescopic front fork is connected with the front wheel and frame. It not only plays a part of the skeleton support, but also plays the role of shock absorber. With the mutual expansion and contraction between the handle tube and the casing, the oil in the front fork flows through the small hole set in the next door. When the handle tube is compressed, with the movement of the handle tube (as shown in Figure 1), the oil in chamber B is pressurized and flows to chamber C through the small hole on the handle tube. At the same time, it flows to chamber a through the free valve. When the oil flows, the resistance attenuates the compression force. When the compression stroke is close to the limit, the conical oil seal at the end of the handle tube will be inserted, thus closing the oil passage in chamber B. At this time, the oil pressure in chamber B rises sharply, making it in a closed state, which limits the stroke of the handle tube and effectively prevents the instantaneous machine between the movable parts on the front fork
Mechanical collision. When the handle tube is extended (i.e. rebounded), the oil in chamber a is set at the upper part of the front fork piston (* near the front fork piston)
The small hole near the piston ring flows to chamber C. At this time, the resistance to oil flow attenuates the tensile force. When the extension stroke is close to the limit, the extension of the rebound spring absorbs the vibration energy, and in this process, the oil is supplemented to chamber B through the small hole at the lower part of the front fork piston, which is ready for the next work.