A caliper with parking brake function

Abstract

The invention discloses a caliper with a parking brake function, which includes a caliper body, a piston and a parking brake device. The parking brake device includes a parking brake pull arm that rotates. The parking brake The device also includes a two-stage axial displacement transmission mechanism that converts the rotational motion input from the parking brake pull arm into linear motion and transmits the linear motion to the piston. The caliper of the present invention uses a two-stage axial displacement transmission mechanism to convert the rotary motion input from the parking brake pull arm into linear motion, and transmit the linear motion to the piston to drive the piston to move linearly, so as to realize the axial movement during parking. Axial displacement transmission can cancel the complex anti-rotation structure, thereby simplifying the design and manufacturing process of parts, reducing the failure mode of the product, and improving the assembly process, reliability and performance of the product.

Description

technical field [0001] The invention relates to a motor vehicle brake component, in particular to a component in a motor vehicle parking brake system. Background technique [0002] Compared with the drum-in-disk brake, the caliper with integrated parking function has gradually occupied a larger share in the passenger car and light commercial vehicle market due to its excellent performance in system layout and light weight. The technical research and development of calipers for vehicle functions has gradually attracted the attention of various brake industry manufacturers. [0003] The patent document with the publication number CN1600609 discloses a brake caliper with a parking brake. In this patent document, the axial displacement is realized by relying on the movement of the steel ball on the slope set between the steel ball disc and the steel ball seat. Transmission, during the parking action, there is no relative rotation between the multi-head screw and the multi-head ...

AI Technical Summary

Problems solved by technology

[0003] The patent document with the publication number CN1600609 discloses a brake caliper with a parking brake. In this patent document, the axial displacement is realized by relying on the movement of the steel ball on the slope set between the steel ball disc and the steel ball seat. Transmission, during the parking action, there is no relative rotation between the multi-head screw and the multi-head screw sleeve, and the spring seat is fixedly connected with the cylinder through the collar, steel ball seat, anti-rotation pin and cylinder. The technical problems of this scheme mainly include: spring seat The caliper, steel ball seat, anti-rotation pin and cylinder block are fixedly connected by the collar, which requires high precision of the parts. When the cumulative tolerance of each part in the axial dimension is too large, the collar cannot be assembled, and the axial dimension is too small. As a result, the system has a large axial movement and is in an unstable state. The structure of the spring seat is complex, there is sliding friction in the system, and the transmission efficiency is low.

[0004] The patent document with the notification number CN100507303C discloses a disc brake caliper. In this patent document, in order to prevent the screw from rotating, a sleeve chuck formed by stamping, deep drawing or pressing is used to cooperate with the screw, so that The structure of the screw and the collet chuck become complicated and difficult to assemble. In order to reduce the friction during parking, a cap structure is added between the shaft and the screw, so that the original surface contact becomes point contact, but this The structure is more difficult to realize, with more parts and difficult to assemble

[0005] The parking transmission mechanism in the brake caliper disclosed in the above two patent documents is a single-stage transmission structure, that is, in this structural design, there is only one stage of the mechanism that can transmit the axial displacement during the parking action, so that in the following In a series of structural designs, it is necessary to carry out anti-rotation design for the self-referring sliding screw pair. Due to the design of the anti-rotation structure, the structure of the parts is complicated, the precision of the parts is high, the failure modes of the product are many, the reliability is reduced, and the assembly The process is complicated. In addition, there is sliding friction in the single-stage axial displacement transmission mechanism. When parking, the output efficiency of the parking mechanism will be reduced due to the loss of sliding friction.

In addition, in the Ball In Ramp integrated parking function caliper, due to space constraints, the size of the ball track cannot be further reduced, which will affect the parking magnification ratio of the entire product

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