An air circuit structure for a vehicle braking system

Abstract

This invention discloses an air circuit structure for a vehicle braking system, using a two-position three-way solenoid valve to control the intake and exhaust of the braking system, reducing cost and the complexity of solenoid valve placement. When a braking command is issued, the ball screw slider, driven by the drive motor, moves away from the brake actuator cylinder on the ball screw, braking the intermediate shaft and thus accelerating braking. When the intermediate shaft speed is about to synchronize and reaches the speed synchronization window, the drive motor drives the ball screw slider to move towards the brake actuator cylinder, increasing the speed synchronization window and controlling the speed more precisely. When a brake release command is issued, the brake valve closes, releasing the brake piston from the brake disc and friction pads, thereby accelerating the release of braking force. Precise speed control during braking significantly reduces delay and improves the control effect on the intermediate shaft speed, making it suitable for large-scale industrial use and promotion.

Description

Technical Field

[0001] This utility model belongs to the field of commercial vehicle braking systems, specifically relating to an air circuit structure for a vehicle braking system. Background Technology

[0002] An automotive air brake system consists of components such as an air compressor, brake cylinders, a master brake valve, and a brake pedal. The air compressor compresses air into high-pressure gas, which is then delivered to the brake cylinders through pipelines to generate braking force. The brake cylinders convert the compressed air into mechanical energy, driving the brakes. Based on air pressure control and conversion, the air brake system allows the driver to brake and release the vehicle by operating the brake pedal, improving driving safety and braking effectiveness.

[0003] However, in existing braking systems, the intake pressure is uncontrolled. When the brake valve works simultaneously with other valves, the intake pressure fluctuates, making it impossible to guarantee rapid braking. When the speed is about to reach the target speed, the maximum braking force needs to be reduced to increase the speed synchronization window, so that the speed can reach the target speed more accurately. However, the maximum braking force cannot be controlled in existing systems. Furthermore, after the speed synchronization is completed and the brake release command is issued, the exhaust force cannot be released quickly to release the braking force, resulting in a delay in brake release, which may lead to insufficient control of the intermediate shaft speed. Utility Model Content

[0004] The purpose of this utility model is to provide an air circuit structure for a vehicle braking system to solve the problem in the prior art where the uncontrolled intake pressure of the braking system causes a delay in braking and releasing the vehicle, resulting in insufficient control of the intermediate shaft speed.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: An air circuit structure for a vehicle braking system, characterized in that it includes an air intake pipe, the first end of which is connected to the air intake port of the vehicle controller, and the second end of which is connected to the first end of a two-position three-way brake valve. The second end of the two-position three-way brake valve is connected to the cavity of the vehicle controller; the third end of the two-position three-way brake valve is connected to the brake cylinder; and the two-position three-way brake valve is electrically connected to the vehicle controller. The brake cylinder has a piston that slides inside it, and a brake return spring is connected to the side of the piston away from the brake cylinder. The brake return spring enters the interior of the intermediate shaft of the vehicle; a ball screw is installed inside the intermediate shaft, and a ball screw slider is slidably installed on the ball screw via a drive motor; the brake return spring is fixedly connected to the ball screw slider. The central axes of the ball screw, intermediate shaft, and brake return spring are collinear.

[0006] This utility model also has the following features: Furthermore, the intermediate shaft is provided with multiple brake discs and friction plates.

[0007] Furthermore, the aforementioned brake discs and friction pads are arranged alternately and side-by-side on the intermediate shaft.

[0008] Furthermore, the friction plate is connected to the intermediate shaft via a spline.

[0009] Furthermore, the two-position three-way brake valve is a solenoid valve.

[0010] Compared with the prior art, this utility model has the following technical effects: The air circuit structure of the vehicle braking system of this utility model uses a two-position three-way solenoid valve to control the intake and exhaust of the braking system, which reduces the cost and the difficulty of arranging the solenoid valve.

[0011] When the braking command is issued, the ball screw slider, driven by the drive motor, moves away from the brake actuator cylinder on the ball screw, reducing the resistance of the return spring on the brake piston. The piston overcomes the smaller resistance and pushes the brake disc and friction pads to brake the intermediate shaft, thereby accelerating the braking.

[0012] When the intermediate shaft speed is about to synchronize and reaches the speed synchronization window, the drive motor drives the ball screw slider to move towards the brake cylinder, reducing the pressure of the brake piston on the brake disc and friction pads, reducing the maximum braking force, thereby increasing the speed synchronization window and controlling the speed more precisely.

[0013] When the brake release command is issued, the brake valve closes, and the drive motor drives the ball screw slider to move towards the brake cylinder on the ball screw. Together with the return spring force, the brake piston moves towards the end of the brake cylinder shaft. The gas in the brake cylinder is discharged to the exhaust port, releasing the pressure of the brake piston on the brake disc and friction pads, thereby accelerating the release of the braking force.

[0014] In summary, the air circuit structure of the vehicle braking system of this utility model can accurately control the speed during braking, greatly reducing the delay and improving the control effect on the intermediate shaft speed, making it suitable for large-scale industrial use and promotion. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the air circuit structure of the vehicle braking system of this utility model.

[0016] The meanings of the labels in the diagram are as follows: 1. Intake pipe; 2. Two-position three-way brake valve; 3. Ball screw slider; 4. Brake actuation cylinder; 5. Piston; 6. Brake return spring; 7. Intermediate shaft; 8. Ball screw; 9. Drive motor; 10. Brake disc; 11. Friction pad. Detailed Implementation

[0017] It should be noted that, unless otherwise specified, all components in this utility model are known components in the prior art. For example, the two-position three-way brake valve is a commonly known two-position three-way brake valve.

[0018] The following are specific embodiments of the present invention. It should be noted that the present invention is not limited to the following specific embodiments. All equivalent modifications made based on the technical solutions of this application fall within the protection scope of the present invention.

[0019] like Figure 1 As shown, an air circuit structure for a vehicle braking system includes an air intake pipe 1, the first end of which is connected to the air intake port of the vehicle controller, and the second end of which is connected to the first end of a two-position three-way brake valve 2. The second end of the two-position three-way brake valve 2 is connected to the cavity of the vehicle controller; the third end of the two-position three-way brake valve 2 is connected to the brake actuation cylinder 4; the two-position three-way brake valve 2 is electrically connected to the controller of the vehicle. A piston 5 is slidably installed inside the brake actuation cylinder 4, and a brake return spring 6 is connected to the side of the piston 5 away from the brake actuation cylinder 4. The brake return spring 6 enters the interior of the intermediate shaft 7 of the vehicle; a ball screw 8 is installed inside the intermediate shaft 7, and a ball screw slider 3 is slidably installed on the ball screw 8 via a drive motor 9; the brake return spring 6 is fixedly connected to the ball screw slider 3. The central axes of the ball screw 8, intermediate shaft 7, and brake return spring 6 are collinear.

[0020] Furthermore, the intermediate shaft 7 is provided with multiple brake discs 10 and friction pads 11.

[0021] As a preferred embodiment, multiple brake discs 10 and friction pads 11 are arranged alternately and side by side on the intermediate shaft 7.

[0022] The air circuit structure of the vehicle braking system in this embodiment uses a two-position three-way brake valve 2 to control the intake and exhaust of the vehicle braking system, which reduces cost and the difficulty of arranging the solenoid valve.

[0023] When the vehicle controller issues a braking command, the ball screw slider 3 moves on the ball screw 8 under the drive of the drive motor 9, reducing the resistance of the brake return spring 6 to the brake piston. The piston 5 overcomes the small resistance and pushes the brake disc 10 and friction pad 11 to brake the intermediate shaft 7, thereby accelerating the braking.

[0024] When the intermediate shaft speed is about to synchronize and reaches the speed synchronization window, the drive motor 9 drives the ball screw slider 3 to move in the opposite direction, reducing the pressure of the brake piston on the brake disc 10 and friction plate 11, reducing the maximum braking force, thereby increasing the speed synchronization window and controlling the speed more precisely.

[0025] When the brake release command is issued, the drive motor 9 drives the ball screw slider 3 to move on the ball screw 8 toward the brake action cylinder. Together with the elastic force of the brake return spring 6, the brake piston moves toward the shaft end of the brake action cylinder 4. The gas in the brake action cylinder 4 is discharged to the exhaust port, releasing the piston 5 from the pressure on the brake disc 10 and friction pad 11, thereby accelerating the release of the braking force.

[0026] In summary, the air circuit structure of the vehicle braking system in this embodiment can accurately control the rotational speed during braking, greatly reducing delay and improving the control effect on the intermediate shaft speed, making it suitable for large-scale industrial use and promotion.

[0027] Specifically, the brake disc 10 and friction plate 11 are connected to the intermediate shaft 7 via splines, and can rotate together with the intermediate shaft 7 or move axially.

[0028] Specifically, the two-position three-way brake valve 2 is a solenoid valve.

[0029] In actual use, a ball screw slider is arranged at the rear end of the brake return spring 6 and connected to it. The ball screw slider is connected to the drive motor 9 through a ball screw. The rotation of the drive motor 9 can drive the ball screw slider to move axially, so that the force of the brake return spring 6 on the brake piston is controllable.

[0030] When the two-position three-way brake valve 2 works simultaneously with other valve groups, the air pressure on the intake side of the two-position three-way brake valve 2 fluctuates. In order to ensure rapid braking, the drive motor 9 drives the ball screw slider to move away from the brake cylinder 4, reducing the resistance of the brake return spring 6 to the piston 5, thereby accelerating the braking effect. When the speed of the intermediate shaft 7 is about to be synchronized, the maximum braking force needs to be reduced, the speed synchronization window needs to be increased, and the speed needs to be controlled more precisely. The drive motor 9 drives the ball screw slider to move towards the brake cylinder 4, reducing the pressure on the brake disc 10 and the brake friction pad 1, thereby reducing the maximum braking force. When the intermediate shaft 7 reaches the target speed, the brake release command is issued, and the gas inside the brake action cylinder 4 is discharged. At this time, the drive motor 9 works to drive the ball screw slider 3 to move in the direction of the brake action cylinder 4, and together with the brake return spring 6, accelerates the exhaust, releases the pressure on the brake disc 10 and the brake friction pad 11, and accelerates the release of the brake.

Claims

1. An air circuit structure for a vehicle braking system, characterized in that, Includes an intake pipe (1), the first end of which is connected to the air intake port of the vehicle controller, and the second end of which is connected to the first end of a two-position three-way brake valve (2). The second end of the two-position three-way brake valve (2) is connected to the cavity of the vehicle controller; the third end of the two-position three-way brake valve (2) is connected to the brake cylinder (4); the two-position three-way brake valve (2) is electrically connected to the vehicle controller. The brake cylinder (4) is equipped with a piston (5) which slides inside. A brake return spring (6) is connected to the side of the piston (5) away from the brake cylinder (4). The brake return spring (6) enters the interior of the intermediate shaft (7) of the vehicle; a ball screw (8) is provided inside the intermediate shaft (7), and a ball screw slider (3) is slidably provided on the ball screw (8) through a drive motor (9); the brake return spring (6) is fixedly connected to the ball screw slider (3). The central axes of the ball screw (8), intermediate shaft (7) and brake return spring (6) are collinear.

2. The air circuit structure of the vehicle braking system as described in claim 1, characterized in that, The intermediate shaft (7) is provided with multiple brake discs (10) and friction plates (11).

3. The air circuit structure of the vehicle braking system as described in claim 2, characterized in that, Multiple brake discs (10) and friction pads (11) are arranged alternately and side by side on the intermediate shaft (7).

4. The air circuit structure of the vehicle braking system as described in claim 3, characterized in that, The friction plate (11) is connected to the intermediate shaft (7) by a spline.

5. The air circuit structure of the vehicle braking system as described in any one of claims 1-4, characterized in that, The two-position three-way brake valve (2) is a solenoid valve.

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