An unmanned tractor power-off brake device controlled by a spring oil cylinder

Abstract

The utility model relates to the technical field of vehicle braking system especially relates to a kind of spring oil cylinder controlled unmanned tractor power-off brake device, its structure is compact, control is reliable, applicable to the power-off brake device of unmanned pure electric tractor, brake can be automatically realized when vehicle abnormal power-off;Including spring brake oil cylinder, brake pump valve group assembly, brake controller, brake connecting rod mechanism and rear axle brake.Spring brake oil cylinder spring force is preset to be slightly greater than the force value required by brake, brake pump valve group assembly includes motor, control valve and gear pump, for when driving to spring brake oil cylinder oil supply to compress spring, release brake;Brake controller receives whole vehicle signal and controls brake pump valve group action;Brake connecting rod mechanism connects spring brake oil cylinder and rear axle brake.

Description

Technical Field

[0001] This utility model relates to the technical field of vehicle braking systems, and in particular to a power-off braking device for an unmanned tractor controlled by a spring cylinder. Background Technology

[0002] Common braking methods for tractors include mechanical parking brakes, pneumatic parking brakes, and electromagnetic power-off parking brakes. Mechanical brakes require manual operation and are not suitable for unmanned vehicles; pneumatic brakes require an air pump and air storage system, resulting in a complex structure and large space requirements; electromagnetic brakes require a dedicated brake bridge, which is costly and lacks versatility. For unmanned pure electric tractors, the motor cannot provide braking force in the event of an abnormal power outage, posing a safety hazard. Existing braking methods are insufficient to meet the requirements of automatic and reliable braking for this type of vehicle in the event of a power outage. Utility Model Content

[0003] To solve the above-mentioned technical problems, this utility model provides a power-off braking device for unmanned pure electric tractors that is compact in structure, reliable in control, and suitable for use. It is a power-off braking device for unmanned tractors controlled by a spring cylinder that can automatically brake when the vehicle is abnormally powered off.

[0004] This utility model discloses a power-off braking device for an unmanned tractor controlled by a spring-loaded hydraulic cylinder, comprising a spring-loaded brake cylinder, a brake pump valve assembly, a brake controller, a brake linkage mechanism, and a rear axle brake. The spring force of the spring-loaded brake cylinder is preset to be slightly greater than the required force of the brake. The brake pump valve assembly includes a motor, a control valve, a gear pump, an accumulator, and a pressure relay. The brake controller receives signals from the vehicle and controls the operation of the brake pump valve assembly.

[0005] Preferably, the brake pump valve assembly further includes an accumulator pressure relay and a one-way throttle valve. The accumulator is used to maintain oil pressure, the pressure relay is used to detect oil pressure and control the start and stop of the motor and the on / off state of the solenoid valve, and the one-way throttle valve is installed in the return oil chamber of the spring brake cylinder to control the spring release time and reduce the impact during emergency braking.

[0006] Preferably, the spring brake cylinder is a single-acting cylinder, and the spring is disposed in the rodless chamber.

[0007] Preferably, the brake controller controls the solenoid valve to open when the vehicle is abnormally powered off, thereby depressurizing the oil circuit of the spring brake cylinder and achieving braking.

[0008] Preferably, the brake pump valve assembly is connected to the spring brake cylinder via a hydraulic pipeline.

[0009] Compared with existing technologies, the beneficial effects of this utility model are as follows: Applied to unmanned pure electric tractors, it solves the problem of the motor failing to brake when the vehicle experiences an abnormal power outage. Furthermore, it avoids the problems of traditional braking systems, such as large component size, complex control, and numerous usage limitations. The hydraulically controlled spring cylinder is small in size, has high energy density, and is easy to install and control, thus meeting the vehicle's power-off braking requirements. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of this utility model installed on the vehicle frame; Figure 2 This is a schematic diagram of the axonometric structure of this utility model mounted on the vehicle frame; Figure 3 This is a front view schematic diagram of the structure of this utility model mounted on the vehicle frame; Figure 4 This is a bottom-view three-dimensional structural diagram of the present invention after installation; Figure 5 This is a schematic diagram of the structure of this utility model; The following are labels in the attached diagram: 1. Spring brake cylinder; 2. Brake pump valve assembly; 3. Brake controller; 4. Brake linkage mechanism; 5. Rear axle brake; 6. Brake rocker arm. Detailed Implementation

[0011] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. This utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of this utility model more thorough and complete.

[0012] like Figures 1 to 5 As shown, this utility model includes a spring brake cylinder 1, a brake pump valve assembly 2, a brake controller 3, a brake linkage mechanism 4, and a rear axle brake 5. The spring brake cylinder 1, brake pump valve assembly 2, brake controller 3, and brake linkage mechanism 4 are fixed to the axle by a bracket. The spring brake cylinder 1 is a single-acting cylinder, with the spring located in the rodless chamber, and its spring force slightly greater than the force required by the brake. The brake pump valve assembly 2 includes a motor, a control valve, a gear pump, an accumulator, and a pressure relay. The brake controller 3 receives the start signal from the vehicle controller and controls the operation of the brake pump valve assembly 2; a one-way throttle valve is installed in the spring return chamber. The accumulator extends the spring cylinder's pressure holding time, and the one-way throttle valve controls the spring's release time, thus controlling the impact during emergency braking of the tractor. These components are all integrated into the control valve assembly. The input end of the rear axle brake 5 is connected to a brake rocker arm 6, which is connected to the brake linkage mechanism 4 to transmit braking force.

[0013] This utility model discloses a power-off braking device for an unmanned tractor controlled by a spring-cylinder. During operation, when the vehicle is parked, the spring-cylinder 1 is in the extended state. The spring force is transmitted to the rear axle brake 5 through the brake linkage mechanism 4 and the brake rocker arm 6, achieving parking brake. During driving, the brake controller 3 controls the brake pump valve assembly 2 to start, and oil pressure enters the rod chamber of the spring-cylinder 1, compressing the spring, causing the cylinder to retract and releasing the brake. An accumulator is used to maintain system pressure, and a pressure relay controls the motor's start / stop and the solenoid valve's on / off state based on the oil pressure.

[0014] When the vehicle experiences an abnormal power outage, the solenoid valve in the brake pump valve assembly 2 de-energizes and opens, depressurizing the hydraulic circuit. The spring brake cylinder 1 extends under the action of the spring, pushing the brake linkage mechanism 4 to achieve emergency braking. The one-way throttle valve effectively reduces braking impact by controlling the return oil speed and adjusting the spring release time.

[0015] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. An unmanned tractor power-off brake device controlled by a spring oil cylinder, characterized in that, include: The spring brake cylinder (1) has a spring force preset to be slightly greater than the force required by the brake, and is used to push the brake linkage mechanism to achieve braking when the power is off; the brake pump valve assembly (2) includes a motor, a control valve and a gear pump, and is used to supply oil to the spring brake cylinder to compress the spring and release the brake when the vehicle is in motion; the brake controller (3) is used to receive the start signal of the vehicle controller and control the action of the brake pump valve assembly; the brake linkage mechanism (4) connects the spring brake cylinder and the rear axle brake and transmits the spring force to the brake.

2. A power-off brake device for unmanned tractor controlled by spring oil cylinder as claimed in claim 1, wherein, The brake pump valve assembly (2) also includes an accumulator pressure relay and a one-way throttle valve. The accumulator is used to maintain oil pressure and can extend the pressure holding time of the spring cylinder. The pressure relay is used to detect oil pressure and control the start and stop of the motor and the on and off of the solenoid valve. The one-way throttle valve is installed in the return oil chamber of the spring brake cylinder and is used to control the spring release time and reduce braking impact.

3. A power-off brake system for unmanned tractor controlled by spring cylinder as claimed in claim 1 wherein, The spring brake cylinder (1) is a single-acting cylinder, and the spring is located in the rodless chamber.

4. The unmanned tractor power-off braking device controlled by a spring cylinder as described in claim 1, characterized in that, When the vehicle is abnormally powered off, the brake controller (3) controls the solenoid valve to open and de-energize, thereby depressurizing the oil circuit of the spring brake cylinder (1) and achieving braking.

5. A power-off brake system for unmanned tractor controlled by spring cylinder as claimed in claim 1 wherein, The brake pump valve assembly (2) is connected to the spring brake cylinder (1) via a hydraulic pipeline.

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