Automatic brake gap regulating arm for automobile

Abstract

An automatic adjusting arm for brake gaps of automobiles belongs to the technical field of automobiles, and in particular relates to a device for automatically adjusting the gaps between brake drums and friction plates of automobiles. The automatic adjustment arm of the brake clearance of the automobile includes a housing, in which a large worm gear and a large worm are installed, and a small worm gear is sleeved on the other side of the large worm, and the end of the small worm gear is provided with teeth, and there are teeth on the large worm The teeth meshing with the teeth at the end of the small worm wheel are provided with a one-way clutch device on the side of the small worm wheel. The one-way clutch device includes a small worm and a clutch gear. Connected to the gear, the small worm meshes with the small worm wheel, and a control arm assembly is arranged at the end of the large worm wheel, and the clutch gear meshes with the control arm assembly. Due to the addition of a small worm wheel and a small worm, the automatic adjustment arm has an internal working stroke of 360 degrees, and the range of motion of the control arm can reach about 220 degrees, which improves the reliability and stability of the automatic compensation of the adjustment arm, and is very convenient to use .

Description

technical field [0001] The invention belongs to the technical field of automobiles, in particular to a device for automatically adjusting the gap between an automobile brake drum and a friction plate. Background technique [0002] When the car is running, the brakes need to be used frequently. Long-term use will cause the gap between the brake drum and the friction plate to become larger. If it is not adjusted in time, the braking distance will be too large, the brake drum will be out of round, etc., which will bring unsafe hidden dangers to driving. Therefore, in my country's national standard, it is clearly stipulated that motor vehicles such as passenger cars, trucks and trailers must be equipped with automatic brake clearance adjustment arms. [0003] For this reason, various self-adjusting arms have appeared, and some have applied for patents. Divided from the structure of various automatic adjustment arms, they can be roughly divided into two categories. One is the...

AI Technical Summary

Problems solved by technology

[0007] In the ratchet type automatic adjustment arm, since the expansion and contraction of the pin is realized by the spring, if the spring is insufficient or the pin is worn out, the adjustment will fail, which will directly affect the stability and reliability of the product.

[0008] Another disadvantage is that the number of gear teeth inside the ratchet-type adjusting arm is small, and the shoes need to wear about 0.15mm to compensate in actual use. The compensation accuracy is low, which affects the safety of driving.

[0009] In addition, whether it is a rack-type automatic adjustment arm or a ratchet-type automatic adjustment arm, there are relatively large weak links in terms of mechanical performance.

Because it is a single point of force, it is subjected to the air pressure above 0.6Mpa when braking, and its internal parts are under great force, which is very easy to cause fracture, which makes the service life of the product short and poor in reliability.

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