Chapter 22 Suspension 同©大学 TONGII UNIVERSTTY Double action telescopic shock absorber >Rebound valve and compression valve are 与车架 (身)相连 unloading valves.The spring is stronger and the preload is big.Only the oil pressure rises to a certain level can they open.And when the 活 防尘罩 oil pressure reduces to a certain level the 油封 valves close automatically. 导向座 >Compensating valve and flow valve are one- 伸张阀 way valves.The spring is weak.When the oil 活塞 流通阀 pressure force is the same direction as spring force,the valves close.When the oil pressure 储油缸 工作缸 force is opposite direction to spring force,just a small oil pressure can open the valves. 压缩阀 补偿阀 >The function is compensation the oil in extension stroke and compression stroke to 与车桥相连 avoid appearing vacuum in the upper and under lumens
Chapter 22 Suspension Rebound valve and compression valve are unloading valves. The spring is stronger and the preload is big. Only the oil pressure rises to a certain level can they open. And when the oil pressure reduces to a certain level the valves close automatically. Compensating valve and flow valve are oneway valves. The spring is weak. When the oil pressure force is the same direction as spring force，the valves close. When the oil pressure force is opposite direction to spring force, just a small oil pressure can open the valves. The function is compensation the oil in extension stroke and compression stroke to avoid appearing vacuum in the upper and under lumens. Double action telescopic shock absorber
Chapter 22 Suspension 大学 The working process of double action telescopic shock absorber >Connecting rod moves downwards with the piston Compression stroke 与车架 (身)相连 >The oil pressure of working cylinder's under lumen increases 活 防尘罩 >Rebound valve and compensating valve close 油封 >The high pressure of the under lumen opens the 导向座 杆 flow valve 伸张阀 >The liquid outflows from the normal open hole of the 活塞 流通阀 compression to oil storage cylinder >The damping force increases gradually 储油缸 工作缸 压缩阀 补偿阀 >When the velocity of piston is very quick,the oil pressure of under lumen is high.It overcomes the retainer spring of the compression and the compression 与车桥相连 valve open completely.The damping force doesn't increase,so playing a role of unloading
Chapter 22 Suspension The working process of double action telescopic shock absorber Connecting rod moves downwards with the piston The oil pressure of working cylinder’s under lumen increases Rebound valve and compensating valve close The high pressure of the under lumen opens the flow valve The liquid outflows from the normal open hole of the compression to oil storage cylinder The damping force increases gradually Compression stroke When the velocity of piston is very quick, the oil pressure of under lumen is high. It overcomes the retainer spring of the compression and the compression valve open completely. The damping force doesn’t increase, so playing a role of unloading
Chapter 22 Suspension 日大学 The working process of double action telescopic shock absorber >Connecting rod moves upwards with the piston Extension stroke >The oil pressure of working cylinder's upper lumen 与车架 increases. (身)相连 >The flow valve and compression valve close. 活 防尘罩 >The oil flows into under lumen through rebound 油封 导向座 valve's normal open holes. 杆 伸张阀 >The compensating valve open,the oil in the oil 活塞 流通阀 reservoir casing flows into the under lumen.The damping force increases gradually 储油缸 工作缸 压缩阀 补偿阀 >When the velocity of piston is very quick,the oil pressure of the upper lumen is high.It overcomes the retainer spring of the rebound valve and the rebound 与车桥相连 valve opens completely.Then the damping force doesn't increase,so playing a role of unloading
Chapter 22 Suspension Connecting rod moves upwards with the piston The oil pressure of working cylinder’s upper lumen increases. The flow valve and compression valve close. The oil flows into under lumen through rebound valve’s normal open holes. The compensating valve open, the oil in the oil reservoir casing flows into the under lumen. The damping force increases gradually Extension stroke When the velocity of piston is very quick, the oil pressure of the upper lumen is high. It overcomes the retainer spring of the rebound valve and the rebound valve opens completely. Then the damping force doesn’t increase, so playing a role of unloading. The working process of double action telescopic shock absorber
Chapter 22 Suspension 日大学 The working process of double action telescopic shock absorber >There are small normal open holes on the compression valve and rebound 与车架 (身)相连 valve.When the vibration velocity is lower,only relying on these small holes to work.The valves open to work only 活 防尘罩 when the vibration velocity is higher. 油封 The damping force changes with the 导向座 vibration velocity. 杆 伸张阀 活塞 流通阀 >Because the spring stiffness of rebound 储油缸 valve is bigger than compression valve's, 工作缸 and the diameter of normal open hole on 压缩阀 rebound valve is smaller than 补偿阀 compression valve's.These ensure that the damping force produced in extension stroke is bigger than that produced in 与车桥相连 compression stroke
Chapter 22 Suspension There are small normal open holes on the compression valve and rebound valve. When the vibration velocity is lower, only relying on these small holes to work. The valves open to work only when the vibration velocity is higher. The damping force changes with the vibration velocity. Because the spring stiffness of rebound valve is bigger than compression valve’s, and the diameter of normal open hole on rebound valve is smaller than compression valve’s. These ensure that the damping force produced in extension stroke is bigger than that produced in compression stroke. The working process of double action telescopic shock absorber
Chapter 22 Suspension 日大学 The working process of double action telescopic shock absorber 与车架 (身)相连 压缩行程 活 防尘罩 油封 流通阀开启 压缩阀开启 导向座 杆 伸张阀 活塞 流通阀 储油缸 伸张行程 工作缸 压缩阀 补偿阀 伸张阀开启 补偿阀开启 与车桥相连 双向作用筒式减振器工作原理
Chapter 22 Suspension The working process of double action telescopic shock absorber