Driving and parking braking system

Abstract

The utility model discloses a traveling and parking braking system which comprises an air pump, an air storage cylinder, a two-position five-way reversing valve, a two-position switch, an electromagnetic valve, a foot brake valve, a first relay valve, a second relay valve, a booster pump, a traveling brake and a parking brake, the two-position five-way reversing valve is provided with five channel ports A, B, S, P and R, the B port is a traveling braking air inlet, the P port is a parking braking air inlet, and the S port is a parking braking air inlet. The R port is a parking release exhaust port, the A port is connected with a first relay valve, and the S port is connected with a foot brake valve; the air pump is connected with the air storage cylinder, the air storage cylinder is connected with the first relay valve, the second relay valve, the electromagnetic valve and a port B and a port P of the two-position five-way reversing valve, and the first relay valve is connected with the parking brake. The two-position switch is respectively connected with the electromagnetic valve and the two-position five-way reversing valve, the foot brake valve is connected with the second relay valve, and the second relay valve is connected with the service brake through the booster pump, so that flexible switching between brake forming and parking brake of the vehicle can be realized through the same power source, and the operation is convenient.

Description

Technical Field

[0001] This utility model relates to the technical field of braking systems for engineering machinery, and in particular to a driving and parking braking system. Background Technology

[0002] In the field of engineering machinery technology, such as single-drum road rollers, hydraulic tire rollers, loaders, and garbage compactors, the transmission route is generally: engine-transmission-drive shaft-rear axle. The parking brake is mechanical, and the handbrake lever is manually lifted for braking limit. The handbrake occupies a lot of space and requires a lot of operating force. Many markets have put forward the demand for electric handbrakes. When driving, the service brake is often of the air-to-hydraulic type. The air source is transmitted from the foot brake valve to the booster pump. The transmission path is long and the action time is long, resulting in the disadvantage of long braking distance. Utility Model Content

[0003] This application provides a driving and parking braking system that uses a single power air source and can switch between the two systems with one button to meet the driving and parking conditions of the vehicle respectively. The system has a simpler structure, is easier to operate, has a shorter braking response time, and higher braking efficiency.

[0004] This application provides a vehicle and parking brake system, including an air pump, an air reservoir, a two-position five-way reversing valve, a two-position switch, a solenoid valve, a foot brake valve, a first relay valve, a second relay valve, a booster pump, a vehicle brake, and a parking brake. The two-position five-way reversing valve has five ports: A, B, S, P, and R. Port B is the vehicle brake air inlet, port P is the parking brake air inlet, port R is the parking release exhaust port, port A is connected to the first relay valve, and port S is connected to the foot brake valve.

[0005] The air pump is connected to the air reservoir, and the air reservoir is connected to the first relay valve, the second relay valve, the solenoid valve, and the B and P ports of the two-position five-way reversing valve. The first relay valve is connected to the parking brake.

[0006] The two-position switch is connected to the solenoid valve and the two-position five-way directional valve respectively. The foot brake valve is connected to the second relay valve, and the second relay valve is connected to the service brake through the booster pump.

[0007] In one possible implementation, the driving and parking braking system further includes an oil-water separator valve, and the air pump is connected to the air reservoir through the oil-water separator valve.

[0008] In one possible implementation, the two-position switch is an electrically operated changeover switch or a mechanical manual valve.

[0009] In one possible implementation, the parking brake is a spring parking brake.

[0010] Beneficial effects: Compared with the prior art, the vehicle and parking braking system provided in this application can achieve flexible switching between vehicle braking and parking braking states by using the same power source under the cooperation of various components, realize electric normally closed parking, short braking time, high parking safety, high braking efficiency, simple overall structure and convenient operation.

[0011] These and other objects, features and advantages of this utility model will be fully realized through the following detailed description. Attached Figure Description

[0012] Figure 1 A schematic diagram of the driving and parking braking system of this application is shown. Detailed Implementation

[0013] The following description is intended to disclose the present invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art. The basic principles of the present invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the present invention.

[0014] Those skilled in the art should understand that, in the disclosure of this specification, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limitations on this utility model.

[0015] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0016] refer to Figure 1 This application provides a vehicle and parking brake system, including an air pump, an air reservoir, a two-position five-way directional valve, a two-position switch, a solenoid valve, a foot brake valve, a first relay valve, a second relay valve, a booster pump, a service brake, and a parking brake. The two-position five-way directional valve has five ports: A, B, S, P, and R. The function or connection relationship of each port is as follows:

[0017] Port B is the air inlet for the service brake, port P is the air inlet for the parking brake, port R is the air outlet for the parking release, port A is connected to the first relay valve, and port S is connected to the foot brake valve.

[0018] In addition, the air pump is connected to the air reservoir, and the air reservoir is connected to the first relay valve, the second relay valve, the solenoid valve, and the B and P ports of the two-position five-way reversing valve, and the first relay valve is connected to the parking brake.

[0019] In addition, the two-position switch is connected to the solenoid valve and the two-position five-way directional valve respectively, and the foot brake valve is connected to the second relay valve, and the second relay valve is connected to the service brake through the booster pump.

[0020] The relay valves are a first relay valve and a second relay valve. Each relay valve has four ports: an air inlet, an air outlet, a control port, and an exhaust port. The air inlet is connected to an air reservoir to receive compressed air. The air outlet is used to deliver compressed air to the braking components, such as to the parking brake via the first relay valve, or to the service brake via the second relay valve through a booster pump. The control port is used to control the working state of the relay valves to achieve rapid transmission and contact of the braking signal. The exhaust port is used to discharge air from the braking system.

[0021] In actual operation, the two-position switch controls the two-position five-way directional valve and the solenoid valve respectively, switching between the two independent systems of driving and parking. When the driving brake is applied, the parking brake is released, and when the parking brake is applied, the driving brake can also be activated, as detailed below:

[0022] When the vehicle is in motion, the two switches simultaneously control the two-position five-way directional valve to the left position, the solenoid valve to the open circuit state, and the two-position five-way directional valve to conduct from port P to port A and from port B to port S. Port A is connected to the control port of the first relay valve, so that the first relay valve works, and the air tank transmits compressed air from the air inlet of the first relay valve to the parking brake to release the parking brake.

[0023] When port B is connected to port S, and the foot brake valve is depressed, compressed air is output into the control port of the second relay valve, causing the second relay valve to be in working condition. The air reservoir transmits compressed air from the air inlet of the second relay valve to the booster pump and the service brake, and the service brake is activated. If the foot brake valve is deactivated, there is no air source at the control port of the second relay valve, so the second relay valve is in the closed state, and the gas in the braking system will be discharged from the exhaust port of the second relay valve.

[0024] When the vehicle is in the parking position, both switches simultaneously control the two-position five-way directional valve to the right position, the solenoid valve is in the open position, and the P-to-A and B-to-S ports of the two-position five-way directional valve are not conductive. The first relay valve is not activated, and the parking brake is normally closed, i.e., in the parking state. Although the B-to-S port is not conductive, the solenoid valve is in the open position. When the foot brake valve is depressed, the second relay valve is activated, and compressed air from the air reservoir enters the control port of the second relay valve, activating it. Compressed air is then transmitted from the inlet of the second relay valve to the booster pump and the service brake, activating the service brake. If the foot brake valve is deactivated, there is no air supply to the control port of the second relay valve, and the second relay valve will be closed. The air in the braking system will be discharged from the exhaust port of the second relay valve.

[0025] Therefore, the vehicle braking system and parking braking system provided in this application share a single power source, namely an air pump and an air reservoir. With the cooperation of various components, they can respectively meet the vehicle's driving and parking braking needs, and can achieve electrically operated normally closed parking, resulting in higher parking safety and ease of operation. The relay valve simplifies the layer-by-layer transmission of the braking system, thereby shortening the braking response time and improving braking efficiency.

[0026] In one embodiment, the driving and parking brake system further includes an oil-water separator valve, wherein the air pump is connected to the air reservoir through the oil-water separator valve, and the compressed air can be filtered and the moisture separated through the oil-water separator valve to make the engine run more smoothly.

[0027] In one embodiment, the two-position switch is an electric changeover switch or a mechanical manual valve.

[0028] In one embodiment, the parking brake is a spring parking brake or a high-strength spring parking brake.

[0029] In the system provided in this application, the air pump is driven by the vehicle engine.

[0030] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The advantages of the present invention have been fully and effectively realized. The functions and structural principles of the present invention have been shown and explained in the embodiments, and any modifications or variations may be made to the implementation of the present invention without departing from the stated principles.

Claims

1. A vehicle service and parking brake system, characterized in that, It includes an air pump, an air tank, a two-position five-way reversing valve, a two-position switch, a solenoid valve, a foot brake valve, a first relay valve, a second relay valve, a booster pump, a service brake, and a parking brake. The two-position five-way reversing valve has five ports: A, B, S, P, and R. Port B is the service brake air inlet, port P is the parking brake air inlet, port R is the parking release exhaust port, port A is connected to the first relay valve, and port S is connected to the foot brake valve. The air pump is connected to the air reservoir, and the air reservoir is connected to the first relay valve, the second relay valve, the solenoid valve, and the B and P ports of the two-position five-way reversing valve. The first relay valve is connected to the parking brake. The two-position switch is connected to the solenoid valve and the two-position five-way directional valve respectively. The foot brake valve is connected to the second relay valve, and the second relay valve is connected to the service brake through the booster pump.

2. The service and parking braking system as described in claim 1, characterized in that, It also includes an oil-water separator valve, through which the air pump is connected to the air storage tank.

3. The service and parking braking system as described in claim 1, characterized in that, The two-position switch is either an electric changeover switch or a mechanical manual valve.

4. The service and parking braking system as described in claim 1, characterized in that, The parking brake is a spring parking brake.

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