Clutch working principle and semi-linkage use skills

For a manually-operated vehicle, the clutch is an important component of the vehicle's powertrain and it is responsible for the work of disconnecting and connecting the power to the engine. When driving on urban roads or in complex road sections, clutches have become one of the most frequently used components. The use of clutches directly reflects the level of driving and reflects the protection of vehicles. The correct use of clutches, mastering the principle of clutches and using clutches to solve problems in special circumstances is something that every rider of a manual transmission model should master.

The so-called clutch, as the name suggests, means to use "exclusive" and "conformable" to transmit the right amount of power. Clutch consists of friction plate, spring plate, pressure plate and power output shaft. It is arranged between the engine and gearbox. It is used to transmit the torque stored on the engine flywheel to the gearbox to ensure that the vehicle is transmitted to the drive under different driving conditions. The right amount of driving force and torque are in the category of powertrains. In the semi-linkage, the power input end and the power output end of the clutch are allowed to have a difference in rotation speed, that is, to transmit an appropriate amount of power through the difference in rotation speed.

The clutch is divided into three working states, that is, full linkage without depressing the clutch, half-linkage with some depressing clutches, and non-linkage with depressing the clutch. When the vehicle is running normally, the pressure plate is tightly pressed against the friction plate of the flywheel. At this time, the friction force between the pressure plate and the friction plate is the largest, and the relative static friction is maintained between the input shaft and the output shaft. Both have the same rotation speed. . When the vehicle starts, the driver depresses the clutch, and the movement of the clutch pedal pulls the pressure plate backwards, that is, the pressure plate is separated from the friction plate. At this time, the pressure plate and the flywheel are not in contact with each other and there is no relative friction.

The last kind is the semi-coupled state of the clutch. At this time, the friction force between the pressure plate and the friction plate is less than the fully linked state. There is a sliding friction between the clutch pressure plate and the friction plate on the flywheel. The speed of the flywheel is greater than the speed of the output shaft, and the power transmitted from the flywheel is transmitted to the transmission. At this point, the engine and the drive wheel are equivalent to a soft connection.

In general, the clutch is used when the vehicle starts and shifts. At this time, there is a rotational speed difference between the one shaft and the second shaft of the transmission. After the power of the engine is cut off from the shaft, the synchronizer can work well. The speed of a shaft is kept synchronized with the two shafts. After the gear is hung in, the shaft is combined with the engine power through the clutch so that the power continues to be transmitted.

In the clutch, there is also an indispensable cushioning device, which is composed of two pairs of disks similar to the flywheel. A rectangular groove is formed on the disk, and a spring is arranged in the groove. When the impact occurs, the springs between the two disks elastically interact with one another to buffer the external stimuli. Effective protection of the engine and clutch. In the various parts of the clutch, the strength of the pressure plate spring, the friction coefficient of the friction plate, the clutch diameter, the position of the friction plate and the number of clutches are the key factors that determine the performance of the clutch. The greater the stiffness of the spring, the higher the friction coefficient of the friction plate. The larger the diameter of the clutch, the better the clutch performance.

After knowing the principle, how do we properly use the clutch in everyday driving? According to the above principles, no linkage and full linkage do not require any skill. The real test skills, there are some wrong operation in daily driving, are in the semi-coupled state of the clutch. Therefore, the use of clutch technology is actually a semi-linked use of skills.

There must be a certain amount of semi-linkage time at the start to ensure a smooth start. Sitting novice car has this experience, or turn off at the start, or a trembling out, these are semi-linked skills do not have a good performance. When the car starts, the two axles of the gearbox are stationary. Before we hang a gear, we need to step on the clutch. At this time, the axis of the gearbox is separated from the power. After the first gear is hung by the synchronizer, the axle is also It also becomes static. The power comes out of the flywheel with a certain speed, and there is a huge difference in speed between the shaft and the shaft. This is why the requirement for semi-linkage at the start is much higher than that at the time of the shift. The front and rear parts of the clutch are stationary. A movement.

This kind of speed difference must be digested by semi-linkage, that is, when power is partially transmitted to a shaft, so that the vehicle can start with a more stable posture. Once the vehicle is up, the speed difference will become very small. When the clutch is fully lifted, there will be no impact.

Starting the ramp requires a higher half linkage skill. Semi-linking can digest the difference between the engine speed and the wheel speed, that is to say, there may be situations where the power has been transmitted to the wheels but the wheels are not running. This often happens on the ramp. Generally speaking, for drivers who are not skilled in driving skills, the handbrake will be pulled up at the start of the ramp, and then the clutch will be in a semi-linked state, the hand brake will be loosened, the vehicle will remain stationary, and the car will be prevented from rolling and trailing. The gravity of the vehicle sliding backwards is counterbalanced by the power provided by the engine, and the clutch is responsible for eliminating the rotational speed difference existing here.