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The friction clutch 1
Introduction:
Application of the friction clutch is most widely used is the oldest class of a clutch, which consists essentially of the active part the driven part, and the clamping mechanism actuating four packets. Main driven portion and the pressing mechanism is to ensure that the clutch is in an engaged state and to the basic structure of the power transmission, the clutch actuation means so that the clutch mechanism is mainly separated.
Structure:
First, the premise of ensuring the engine maximum torque transmission, the two basic properties requirements, i.e., complete separation and soft engagement;
Second, the moment of inertia of the driven clutch part as small as possible. If this large rotational inertia, so that when the shift, although due to the separation of the clutch, contact between the engine and the transmission is disengaged, the clutch is still part of a larger moment of inertia of the input to the transmission, which is equivalent to the effect incomplete separation , they can not very well play a role in mitigating the impact between the teeth.
Further, the clutch requires good heat dissipation. Because the vehicle is in motion, the clutch operated by the driver are many times, which makes the clutch due to the relative slipping between the friction surface often produce large amounts of geothermal. Is softer clutch engagement, to generate greater heat, which heat if not shed, for working the clutch will have a serious affect.
Principle:
is an active member of the engine flywheel clutch driven plate having a hub and driven by the sliding friction plates splined to the output shaft ( i.e., the transmission input shaft) is connected. Then pressing spring driven disc pressed against the end face of the flywheel. I.e., the engine torque by the friction between the flywheel and the driven plate contact surface and spread to the driven plate, and then thereby the driven shaft through a series of drive train wheels pass member. The larger the pressing force of the compression spring, the clutch can passGreater torque delivery.
As the car during running, required to keep the power transmission, the transmission is interrupted only temporary needs, thus driving part and driven part of the car is often in the clutch engaged state. Friction spring hold-down device that is employed in order to meet this requirement. When the clutch is disengaged when desired, as long as the depression of the clutch pedal actuating mechanism, the driven hub sleeve fork ring groove pushes the driven plate against the pressure of compression spring is moved in the loosening direction, and the flywheel separation, friction disappear, thereby interrupting the transmission of power.
When the need to restore the power transmission, the speed of the automobile and the engine speed variation is relatively stable, should be properly controlled recovery speed of the clutch pedal, the driven plate at a pressing pressure of the spring, in the direction of engagement moving the flywheel resume contacts. The contact pressure between the two surfaces gradually increases, the corresponding friction torque gradually increases. When the flywheel and the driven plate is not engaged tightly, the friction torque between the two is relatively small, the two may not be synchronized rotation, i.e., the clutch is in the slip state. As the flywheel and the driven plate tightness of engagement is gradually increased, the rotational speed of the two has become increasingly equal. Until the clutch is fully engaged and stopped slipping, the vehicle speed is proportional to the engine speed in order.
The maximum friction clutch torque can be heard depends on the maximum static friction torque between the friction surface, which in turn is determined by the maximum pressure force between the friction surface and the friction surface dimensions and properties. Therefore, a certain configuration of the clutch, the static friction torque is a constant value, the input torque reaches this value, the clutch will slip, thereby limiting suffered driveline torque, to prevent overloading.