Compact actuator for vehicle electronic parking system

Abstract

The invention relates to a compact actuator for a vehicle electronic parking system. The compact actuator is characterized by comprising an outer shell, a driving motor, a transmission gear set and aplanetary gear set, a full-gear transmission mode is adopted, a belt transmission mode adopted by traditional transmission is canceled, a middle idle wheel is adopted, the transmission center distancecan be better guaranteed. The system assembly has lower transmission noise and higher transmission efficiency; the planetary gears have the same structure, so that the assembly process is optimized,the transmission structure is simpler and more compact, and the cost is lower; the gear ring structure and the middle shell are integrally formed, and the problem that the output shaft is broken due to the fact that the coaxiality of the middle shell of the planetary gear set is poor and gears bear large lateral force is solved; Meanwhile, all parts in the planetary gear set are simultaneously mounted in the gear ring of the outer shell at a time in the same assembling procedure, and the driving motor can be mounted in the middle shell in the same procedure under the condition that the outer shell is not needed.

Description

technical field [0001] The invention relates to the technical field of vehicle parking brakes, in particular to a compact actuator for vehicle electronic parking systems. Background technique [0002] The electronic parking brake system traditionally has two kinds of motor actuators, one is based on the traditional handbrake cable parking, the handbrake handle is removed, and the motor is used instead of the handle to apply the cable force to the brake; the other is the caliper type. Electronic parking brake, this kind of actuator is directly assembled to the brake caliper, and then installed to the wheel side of the axle together with the caliper. This structural form of electronic parking has high power transmission efficiency and saves the parking cable. It can directly transmit the braking force to the brake calipers and the braking system, and is easy to install and operate. It is currently used by most vehicles and will be a widely respected form of electronic parking ...

AI Technical Summary

Problems solved by technology

The so-called integrated transmission mechanism mentioned in this patent is actually two shells, one external shell, and another shell is added for internal transmission, and the way of the shell covering the shell solves the problem of positioning to a certain extent. , but it did not solve the problem of large size of the actuator, but made the size larger, and the planetary gear transmission is a two-stage ring gear structure with different sizes, so the assembly process is more complicated and its cost is higher

[0011] Furthermore, the connection method between the motor and the shell terminal is generally connected by a wire harness. The motor is connected to the shell terminal by resistance welding process or tin welding. Either way, welding slag is easy to be generated during the welding process, and the Between the gear transmission, it causes abnormal noise, and the control of welding current and depth is not good, it is easy to weld through, holes, resulting in poor conduction

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