Automatic gap adjusting arm of automobile brake and rotation angle control device thereof

Abstract

The invention relates to an automatic gap adjusting arm of an automobile brake and a rotation angle control device thereof. A first through hole, a second through hole and a third through hole are formed in a shell, a turbine is installed in the first through hole, a first worm matched with the turbine is installed in the second through hole, the rotation angle control device is installed in the third through hole, and the rotation angle control device comprises a mandrel and further comprises a transmission gear, a pulling block, tension springs and a second worm which are sequentially connected to the mandrel in a sleeving manner; the left-handed tension spring is adopted as a one-way clutch, infinite equal dividing can be carried out in the circumferential direction, infinite adjustment can be carried out during work, the conditions that in the prior art, the rotation angle of an adjustment arm is greater than a set value alpha angle but cannot be large enough to drive a one-way ratchet tooth to be meshed to a next tooth, and compensation can only be made by other mechanisms slowly are avoided, quick adjustment to the set value alpha angle can be achieved, the problem of lag ofthe automatic adjustment function of the adjustment arm is avoided, and the driving safety is ensured; and the quantity of accessories is small, machining and manufacturing are simple, and the manufacturing cost is low.

Description

【Technical field】 [0001] The invention relates to the technical field of automobile brakes, in particular to an automatic clearance adjusting arm of an automobile brake and a rotation angle control device thereof. 【Background technique】 [0002] The automatic gap adjustment arm of the automobile brake realizes the automatic adjustment function by controlling the rotation angle of the adjustment arm, and the automatic adjustment function is triggered when the rotation angle of the adjustment arm is greater than the set value. In the prior art, the rotation angle control device is realized by intermeshing one-way ratchet teeth. Due to considerations such as strength, the one-way ratchet can only be provided with N teeth in the circumferential direction (usually N is 10-20 teeth) As an adjustment transmission mechanism. When the rotation angle of the adjustment arm is greater than the set value, the ratchet meshes over one tooth, and the rotation drives the adjustment mechanis...

AI Technical Summary

Problems solved by technology

When the rotation angle of the adjustment arm is greater than the set value, the ratchet meshes over one tooth, and the rotation drives the adjustment mechanism to compensate for the gap during the braking return stroke. In the case of the next tooth, it can only be compensated slowly through other mechanisms, and the automatic adjustment action of the adjustment arm is lagging behind. For example, after a car is newly equipped with an automatic adjustment arm and the initial gap is adjusted, it needs to step on the brake for 40-60 feet to reach the set position. gap, and there are many accessories in the existing design, the processing and manufacturing are difficult, and the cost is heavy

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