Hydraulically-controlled electronic parking executing mechanism

Abstract

The invention discloses a hydraulically-controlled electronic parking executing mechanism, which comprises high-pressure and low-pressure pumps driven by using a motor in a duplex way, and a hydraulic cylinder, wherein the hydraulic cylinder comprises a cylinder body, a piston, a piston rod and a locking device; one end of the cylinder body is provided with an oil outlet, and the other end of the cylinder body is provided with an oil inlet; an unlocking oil port is formed at an elastic position on the locking device; the inlet of the high-pressure pump is connected with an oil tank; the port B2 of a first two-position three-way electromagnetic reversing valve is connected with the outlet of the high-pressure pump; the port P2 of the first two-position three-way electromagnetic reversing valve is connected with the unlocking oil port of the locking device; the inlet of the low-pressure pump is connected with the oil tank; the outlet of the low-pressure pump is connected with the port P1 of a three-position four-way electromagnetic reversing valve 7 through a first one-way valve; the inlet of a throttling valve is connected with the port A1 of the three-position four-way electromagnetic reversing valve, and the outlet of the throttling valve is connected with the oil inlet of the cylinder body, so that an oil inlet pipeline is formed; and the port B3 of a second two-position three-way electromagnetic reversing valve is connected with the port B1 of the three-position four-way electromagnetic reversing valve, and the port P3 of the second two-position three-way electromagnetic reversing valve is connected with the oil outlet of the cylinder body, so that an oil outlet pipeline is formed. A braking mechanism disclosed by the invention is suitable for wide vehicle types, and has continuous and stable power transmission, large and adjustable braking force, low wear and low noise.

Description

technical field [0001] The invention belongs to the technical field of vehicle parking brake systems, in particular to a hydraulically controlled electronic parking actuator. Background technique [0002] The current electronic vehicle parking brake method generally uses a gear mechanism to drive to realize the parking brake. The driving actuator is composed of several gears with a fixed number of teeth. Since the number of teeth is fixed, it can provide a stable transmission ratio. The transmitted torque is transmitted to the parking brake of the vehicle through gear transmission, so as to achieve the effect of parking brake. But this device has such a problem, because the number of teeth is fixed, so the transmission ratio that can be provided is fixed, and it cannot meet the changing parking brake requirements, and there will be interruptions in power transmission, insufficient power, etc., which will cause Affects the effect of the parking brake. At the same time, due ...

AI Technical Summary

Problems solved by technology

[0004] 1. The transmission ratio of the gear mechanism is fixed, and it can only be used one-to-one on the car, which has great limitations

[0005] 2. Since the actuator adopts a gear mechanism, the power transmission will be interrupted and the power will be insufficient.

[0006] Due to the use of mechanical transmission, there are problems of large wear and noise between gears

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