申林|浙江申林|浙江申林汽车部件有限公司

what is a shock absorber

shenlin — Sat, 24 Jun 2023 02:24:09 +0000

The shock absorber is mainly used to suppress the shock when the spring rebounds after absorbing the shock and the impact from the road surface. When passing through uneven roads, although the shock-absorbing spring can filter the vibration of the road surface, the spring itself will reciprocate, and the shock absorber is used to suppress this spring jumping.
In the suspension system, due to the shock of the elastic element, vibration is generated. In order to improve the ride comfort of the car, a shock absorber is installed in parallel with the elastic element in the suspension. In order to attenuate the vibration, the shock absorber used in the automobile suspension system is mostly hydraulic The working principle of the shock absorber is that when the frame (or body) and the axle are vibrated and there is relative movement, the piston in the shock absorber moves up and down, and the oil in the shock absorber chamber repeatedly passes through different chambers from one chamber to the other. The pores flow into another cavity. At this time, the friction between the hole wall and the oil and the internal friction between the oil molecules form a damping force on the vibration, so that the vibration energy of the car is converted into heat energy of the oil, which is then absorbed by the shock absorber and released into the atmosphere. When the oil passage section and other factors are constant, the damping force increases or decreases with the relative movement speed between the frame and the axle (or wheel), and is related to the viscosity of the oil.

What kind of gearboxes are there?

shenlin — Sat, 24 Jun 2023 02:22:49 +0000

There are generally five types of gearboxes, namely: 1. Manual gearbox; 2. Automatic manual gearbox; 3. CVT continuously variable gearbox/CVT gearbox with gears; 4. Dual clutch gearbox; 5. , AMT gearbox.
The classification of gearboxes is as follows: manual gearbox, automatic manual gearbox, CVT continuously variable gearbox/CVT gearbox with gears, dual clutch gearbox, AMT gearbox.
1. Manual gearbox. Advantages: simple structure, low manufacturing cost and maintenance cost, high reliability, fuel economy, high transmission efficiency, quick shift response, compared with other transmissions, manual transmission is more fun to drive. Disadvantages: Compared with automatic transmission, the operation of manual transmission is more cumbersome, and the frustration accompanied by shifting gears cannot be changed.
2. Automatic manual gearbox. Advantages: Manual and automatic switching freely, good fuel economy and comfort. Disadvantages: The manual mode cannot be completely manual, and the cost of use and maintenance is high.
3. CVT continuously variable transmission. Advantages: It feels smooth to use, the gear setting is more free, and the fuel economy is higher than other automatic transmissions, second only to manual transmissions. The exhaust gas emission is relatively low and more environmentally friendly. Disadvantages: 1. Because the cost of CVT is high, if it is not operated properly, the probability of problems will be higher. 2. Because the steel belt of the CVT transmission can bear limited force, many CVT models will have insufficient stamina.
4. Dual clutch gearbox. Advantages: fast shifting, almost no torque loss, 15% reduction in fuel consumption, and almost no frustration. Disadvantages: high cost and poor stability.
5. AMT. Advantages: high transmission efficiency, low manufacturing cost, simple structure and low fuel consumption. Disadvantages: large shifting impact, poor comfort.

The role of the rocker arm of the car engine

shenlin — Sat, 24 Jun 2023 02:20:15 +0000

The function of the rocker arm of the automobile engine is to change the direction of the movement of the push rod, push or release the valve, and make the valve open or close, thereby controlling the operation of introducing the combustible mixer into the cylinder.
The function of the rocker arm of the engine is to introduce the combustible mixture (or fresh air) into the cylinder, and then compress the combustible mixture (or fresh air) entering the cylinder, and ignite the combustible mixture (or inject diesel into the cylinder at high pressure) Form a combustible mixture and ignite), the combustible mixture is ignited and burned, the expansion pushes the piston down to perform external work, and finally discharges the burned exhaust gas.
The valve rocker arm is a double-arm lever, with the rocker shaft as the fulcrum, and the two arms are unequal in length. The end of the short arm is processed with a threaded hole for screwing in the valve clearance adjustment screw. The end of the long arm is processed into a circular arc surface, which is the working surface for pushing the valve.
The rocker arm seat is a part of the intake and exhaust mechanism in the overhead valve engine. The intake and exhaust mechanism is composed of camshaft, tappet, rocker arm, rocker shaft, rocker seat, valve, valve spring and other parts. The opening and closing of the valve is completed by the action of the tappet and the rocker arm. The rocker arm is installed on the rocker arm seat through the rocker shaft. One end is driven from the camshaft through the tappet, and the other end is pressed against the valve stem together with the spring. The function controls the opening and closing of the valve.
The valve rocker arms need to be connected by a metal connecting rod, and the cam lifts the connecting rod to push the rocker arm to realize the opening and closing of the valve. But too high rotation speed can easily cause the ejector pin to break, so this design is mostly used in engines with large displacement, low rotation speed and high torque output. The overhead camshaft can omit the ejector rod, which simplifies the transmission mechanism from the camshaft to the valve, and is more suitable for the power performance of the engine at high speed. The overhead camshaft is widely used.