Principle of automobile automatic adjusting arm
Release time:
2023-07-21 08:38
Source:
1. design idea
The function of the automatic adjusting arm should be to record the increase in clearance due to friction lining wear and adjust the brake clearance to the normal working range.
Angular stroke during 2. braking
The angular stroke of the adjusting arm during braking can be divided into three parts:
1. The clearance angle corresponds to the normal clearance between the brake drum and the friction lining; 2. The excess clearance angle, Corresponds to the gap increased by the wear of the friction lining;
3. Elastic angle, corresponds to the elasticity caused by the brake drum, friction lining, brake cylinder and brake system power transmission.
The elastic angle in the angular stroke should be avoided as much as possible when the gap is automatically adjusted. If the superstar gap angle and the elastic angle are not distinguished, they will be compensated at any time, which will cause excessive adjustment, resulting in "dragging" or even "locking".
3. automatic adjustment arm working process
When braking starts, the adjustment arm drives the camshaft to rotate through the gap angle and the excess gap angle, and record the wear generated. At this time, the cam angular stroke is in the gap area, and the gap area is characterized by little change in braking torque. When
continues to brake, the cam angle stroke enters the elastic deformation zone, and the braking torque rises sharply until the car stops. Release the pedal, the brake returns, the braking torque decreases, and the cam angle stroke returns to the clearance area. According to the excessive clearance recorded during braking, the automatic adjustment arm, the internal adjustment mechanism drives the camshaft to rotate through a certain angle through the worm gear to complete an adjustment.
automatic adjusting arm
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