Air pressure disc brake pressure arm with bearing limiting structure

Abstract

The invention relates to an air pressure disc brake pressure arm with a bearing limiting structure. The air pressure disc brake pressure arm comprises a pressure arm body. One end of the pressure arm body serves as a force bearing part, the other end of the pressure arm body serves as a spinning part, the inner surface of the spinning part serves as a rotary arc surface, the outer surface of the spinning part serves as a thrust arc surface, a fulcrum cylinder is arranged in a concave part formed on the rotary arc surface, the fulcrum cylinder and the rotary arc surface are concentrically arranged, a plurality of needle bearings are arranged around the fulcrum cylinder, and a positioning block is arranged on the side, away from the rotary arc surface, of the fulcrum cylinder. A limiting block is arranged on the portion, at the upper end of the rotary arc surface, of the spinning part, a liming sheet is arranged at the lower end of the rotary arc surface, and the lower end face of the limiting block is higher than the inner surface of the positioning block and lower than the tops of the needle bearings close to the limiting block. According to the air pressure disc brake pressure arm with the bearing limiting structure, through the combined action of the limiting block and the limiting piece, it is guaranteed that the needle bearings are always located in the range of the rotary arc surface of the pressure arm body, and it is guaranteed that the pressure arm body normally works.

Description

technical field [0001] The invention relates to an air pressure disc brake pressure arm, in particular to an air pressure disc brake pressure arm with a bearing limiting structure. Background technique [0002] At present, disc brakes have incomparable advantages over drum brakes, and pneumatic disc brakes are more and more widely used in the field of commercial vehicles. Pneumatic disc brakes provide stable and effective braking torque, and achieve braking by the torque that hinders the rotation of the wheel generated by the contact between the friction plate and the brake disc. As the most critical part of the booster mechanism, the pressure arm multiplies the input force input by the cylinder through the principle of leverage to provide sufficient braking torque. [0003] The pressure arm is fixed on the caliper body through the needle roller bearing, fulcrum cylinder and positioning block. When the pressure arm is actuated by the cylinder, the rotating arc surface rotat...

AI Technical Summary

Problems solved by technology

However, if the sliding bearing or needle roller bearing rolls out of the small arc of the pressure arm, the fulcrum cylinder will directly contact the small arc of the pressure arm, causing the braking system to be stuck, resulting in the failure of the entire braking system

Images