Parking brake system and engineering machine
A braking system and parking technology, applied in the directions of brakes, brake transmission devices, vehicle components, etc., can solve problems such as tipping, damage to construction machinery, endangering the personal safety of operators, etc., to ensure safety and fast braking speed. , the effect of high safety
Active Publication Date: 2014-04-16
SANY MARINE HEAVY IND +1
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Problems solved by technology
[0005] In the above-mentioned parking brake system, when the power of the whole vehicle is suddenly cut off due to electrical failure during high-speed driving, the parking brake solenoid valve loses power, and the parking brake cylinder is under the action of the spring braking force. Directly return to the fuel tank, resulting in rapid parking, which will cause the danger of the construction machinery suddenly parking at high speed and tipping forward, which will not only cause damage to the construction machinery, but also seriously endanger the personal safety of the operator
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[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0030] figure 1 Shown is a hydraulic schematic diagram of the parking brake system according to an embodiment of the present invention. It can be seen from this figure that the parking brake system of the present invention at least includes a brake (not shown in the figure), a brake cylinder 1, a first electromagnetic control valve 21 and a first oil return circuit. During use, hydraulic oil enters the system from the oil inlet circuit and flows into the oil ...
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The invention discloses a parking brake system and an engineering machine. The parking brake system comprises a brake; a brake cylinder connected with the brake, wherein action of the brake cylinder controls opening and closing of the brake; a first electromagnetic control valve, wherein an oil inlet of the first electromagnetic control valve is connected with an oil inlet path and a working oil port is connected with the brake cylinder, and the first electromagnetic control valve is used to achieve a first power-on state and a second power-off state; and a first oil return path, which includes an oil path from the brake cylinder to an oil tank and is provided with a flow control device in order to reduce flow of hydraulic oil entering the oil tank. The parking brake system may also comprise a second oil return path, which is provided with a second direction control valve. When emergency parking is caused by electrical failure and the hydraulic oil flows into the oil tank by the flow control device, the parking brake system can reduce return oil speed to achieve slow parking. The system has the advantages of high safety, capability of achieving two parking modes, a stable and reliable structure and easiness in implementation.
Description
technical field [0001] The invention mainly relates to the fields of hydraulic pressure and engineering machinery, in particular to a parking brake system and engineering machinery including the parking brake system. Background technique [0002] At present, the parking brake system of construction machinery (such as reach stacker and stacker) adopts the working principle of hydraulic release and spring brake. The parking system is mainly composed of an accumulator, a parking brake solenoid valve, a parking brake cylinder, and an oil return circuit. [0003] When the vehicle is ready to shift into gear, the parking brake solenoid valve is energized, and the hydraulic oil in the accumulator enters the parking brake cylinder through the parking brake solenoid valve, overcomes the spring force, opens the parking brake, and releases parking; At the same time, the corresponding pressure relay operates to send out an electric signal, the parking brake indicator light goes out, an...
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IPC IPC(8): B60T13/14B60T13/68
Inventor 董元俊杨小华单俊峰
Owner SANY MARINE HEAVY IND