Novel hydraulic braking system of backhoe loader

Abstract

The utility model relates to a novel hydraulic brake system of a backhoe loader. The novel hydraulic brake system comprises a brake pedal, a double-cavity booster, a gearbox and a brake, the brake pedal is connected with the double-cavity booster through a mechanical connecting rod; the double-cavity booster comprises a hydraulic boosting end and a pressure output end which are connected through a first oil way pipeline. The gearbox conveys hydraulic oil to the hydraulic power assisting section through an oil inlet pipeline. The brake is connected with the pressure output end of the double-cavity booster through a brake pipeline, and vehicle braking is achieved. The double-cavity booster is adopted to replace a vacuum pump and a braking oil tank, the problem of invalid braking is solved through a hydraulic braking mode, more braking force can be provided, and the hydraulic booster is suitable for high-speed driving and emergency braking.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic brakes, and specifically to a new hydraulic brake system for an excavator loader. Background Art

[0002] The statements herein merely provide background art related to the present invention and do not necessarily constitute prior art.

[0003] Existing backhoe loaders often use vacuum boosters for gas braking, but due to the poor sealing performance in the booster cavity, gas leakage is easy to occur, which leads to the problem of ineffective braking when the brake pedal is pressed during braking, which poses certain safety hazards. In addition, the gas braking process requires more components, which has poor reliability, and the brake oil tank and vacuum pump will take up a large space, affecting the overall layout. Utility Model Content

[0004] The purpose of the utility model is to provide a new hydraulic brake system for an excavator loader, comprising: a brake pedal, a double-chamber booster, a gearbox and a brake;

[0005] The brake pedal is connected to the dual-chamber booster via a mechanical connecting rod;

[0006] The dual-chamber booster comprises a hydraulic boosting end and a pressure output end, which are connected via a first oil pipeline;

[0007] The gearbox delivers the hydraulic oil to the hydraulic booster section through the oil inlet pipeline;

[0008] The brake is connected to the pressure output end of the dual-chamber booster through a brake pipeline to achieve vehicle braking.

[0009] As a further technical solution, the dual-chamber booster includes an oil inlet, an oil outlet and a working oil port.

[0010] As a further technical solution, the hydraulic booster end includes two two-position three-way valves, and the two two-position three-way valves are connected to the oil inlet pipeline.

[0011] As a further technical solution, the brake pedal includes two left and right pedals, which are respectively connected to two two-position three-way valves at the hydraulic booster end.

[0012] As a further technical solution, the pressure output end includes a first chamber and a second chamber, the two chambers have the same structure and are connected through a first one-way valve.

[0013] As a further technical solution, the two chambers both include a piston column, which divides the first chamber and the second chamber into a first active chamber and a second active chamber.

[0014] As a further technical solution, one side of the bottom end of the piston column is connected to the inner wall of the chamber via a spring.

[0015] As a further technical solution, the second active chamber is also connected to the oil return pipeline.

[0016] As a further technical solution, one end of the second active chamber is also connected to the two-position three-way valve through a second one-way valve.

[0017] As a further technical solution, there are two brakes.

[0018] Beneficial effects of one or more of the above technical solutions:

[0019] (1) By using a dual-chamber booster instead of a vacuum pump and a brake oil tank, the hydraulic braking mode does not have the problem of ineffective braking, can provide more braking force, and is suitable for high-speed driving and emergency braking.

[0020] (2) Fewer components are used, which reduces costs and makes the space structure more reasonable, making the structure simpler and more operable. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings in the specification, which constitute a part of the present application, are used to provide a further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute a limitation on the present application.

[0022] Figure 1 It is a schematic diagram of the hydraulic brake system of the utility model.

[0023] In the figure, 1 is a brake pedal; 2 is a dual-chamber booster; 3 is a gearbox; 4 is a brake; 5 is a two-position three-way valve; 6 is a first chamber; 7 is a second chamber; 8 is a first movable chamber; 9 is a second movable chamber; 10 is a piston rod; 11 is a first non-return valve; 12 is a second non-return valve; 13 is an oil inlet pipeline; 14 is an oil return pipeline; 15 is a brake pipeline; 16 is a first oil pipeline; 17 is a second oil pipeline; 18 is a spring DETAILED DESCRIPTION

[0024] The following is combined with Figure 1 , describing the specific implementation of this embodiment.

[0025] The present application embodiment provides a new hydraulic brake system for an excavator loader, referring to Figure 1 , the dotted line in the figure indicates the oil inlet pipeline. A new hydraulic brake system for an excavator loader includes: a brake pedal, a double-chamber booster, a gearbox and a brake;

[0026] The brake pedal 1 comprises two left and right pedals, which are respectively connected to two hydraulic booster ends of a dual-chamber booster 2 through mechanical connecting rods.

[0027] The dual-chamber booster includes a hydraulic boosting end and a pressure output end, and the hydraulic boosting end and the pressure output end are connected through a first oil pipeline. The hydraulic boosting end includes two two-position three-way valves 5, and the corresponding oil pipeline connection can be controlled by changing the valve core of the two-position three-way valve 5. The two-position three-way valve is also connected to the oil inlet pipeline 13, and hydraulic oil is pumped into the two-position three-way valve 5 through the gearbox 3.

[0028] The pressure output end includes a first chamber 6 and a second chamber 7, wherein the first chamber 6 and the second chamber 7 have the same structure. The chamber structure is a "convex" shape, and the first chamber 6 and the second chamber 7 are connected by two first one-way valves 11 to achieve the purpose of pressure balance in the chamber during braking. A piston column 10 is also provided in the first chamber 6 and the second chamber 7, and the first chamber and the second chamber are divided into two parts by the piston column 10, wherein the part located on the left side of the piston column 10 and directly connected to the two-position three-way valve 5 is the first active chamber 8; the part located on the right side of the piston column 10 and directly connected to the brake 4 is the second active chamber 9.

[0029] The piston column 10 can move in the first chamber 6 and the second chamber 7 under the action of the hydraulic oil pressure. The second active chamber 9 is also provided with a brake pipe 15 connected to the brake 4. The hydraulic oil in the second active chamber 9 is transmitted to the brake 4 through the two working oil ports A1 and A2 of the dual-chamber booster 2 to realize the braking function of the vehicle. The second active chamber 9 is also connected to the second one-way valve 12, which is connected to the two-position three-way valve 5 through the second oil pipeline 17. After the braking is completed, the hydraulic oil in the first active chamber 8 can be replenished to the second active chamber 9 to prevent the second active chamber 9 from being sucked empty. The lower end of the piston column 10 is also connected to the inner wall of the chamber through a spring 18. After the braking is completed, the rebound of the spring 18 can drive the piston column 10 to move to the left. The upper end of the second active chamber 9 is also connected to the return oil pipeline 14. After the braking is completed, a part of the hydraulic oil in the second active chamber 9 is returned to the oil tank through the return oil pipeline 14.

[0030] Working principle:

[0031] When the left and right brake pedals 1 are stepped on at the same time, under the action of the mechanical connecting rod, the valve core is located in the left position of the two-position three-way valve 5, so that the pumped hydraulic oil flows to the first active chamber 8 through the first oil pipeline 16. Under the action of the hydraulic oil pressure, the piston rod 10 in the first chamber 6 and the second chamber 7 moves, so that the hydraulic oil in the second active chamber 9 flows to the brake 4 through the working oil ports A1 and A2, and hydraulic braking is realized. In this process, the second check valve 12 is closed. Since the first chamber 6 and the second chamber 7 are connected through the first check valve 11, the first check valve 11 plays a role in balancing the pressure of the second active chamber 9 during the braking process; when the brake pedal is released, the valve core of the two-position three-way valve 5 is switched to the right position. At this time, under the action of the spring 18, the piston rod 10 moves to the left, and the volume of the second active chamber 9 increases. In order to prevent the second active chamber 9 from being sucked empty, the hydraulic oil in the first active chamber 8 is replenished from the second check valve 12 to the second active chamber 9 through the two-position three-way valve 5 along the second oil pipeline 17.

[0032] Although the above describes the specific implementation methods of the utility model in combination with the accompanying drawings, it is not intended to limit the scope of protection of the utility model. Technical personnel in the relevant field should understand that on the basis of the technical solution of the utility model, various modifications or deformations that can be made by technical personnel in this field without creative work are still within the scope of protection of the utility model.

Claims

1. A new hydraulic brake system for an excavator loader, characterized in that: include: brake pedal, dual chamber booster, gearbox and brakes; The brake pedal is connected to the dual-chamber booster via a mechanical connecting rod; The dual-chamber booster comprises a hydraulic boosting end and a pressure output end, which are connected via a first oil pipeline; The gearbox delivers the hydraulic oil to the hydraulic booster section through the oil inlet pipeline; The brake is connected to the pressure output end of the dual-chamber booster through a brake pipeline to achieve vehicle braking.

2. A new hydraulic brake system for an excavator loader as claimed in claim 1, characterized in that: The dual-chamber booster comprises an oil inlet, an oil outlet and a working oil port.

3. A new hydraulic brake system for an excavator loader as claimed in claim 1, characterized in that: The hydraulic boosting end includes two two-position three-way valves, and the two two-position three-way valves are both connected to the oil inlet pipeline.

4. A new hydraulic brake system for an excavator loader as claimed in claim 1, characterized in that: The brake pedal comprises two left and right pedals, which are respectively connected to two two-position three-way valves at the hydraulic booster end.

5. A new hydraulic brake system for an excavator loader as claimed in claim 1, characterized in that: The pressure output end comprises a first chamber and a second chamber, the two chambers have the same structure and are connected through a first one-way valve.

6. A new hydraulic brake system for an excavator loader as claimed in claim 5, characterized in that: The first chamber and the second chamber both include a piston column, and the piston column divides the first chamber and the second chamber into a first active chamber and a second active chamber.

7. A new hydraulic brake system for an excavator loader as claimed in claim 6, characterized in that: One side of the bottom end of the piston column is connected to the inner wall of the chamber through a spring.

8. A new hydraulic brake system for an excavator loader as claimed in claim 6, characterized in that: The second active chamber is also communicated with the oil return pipeline.

9. A new hydraulic brake system for an excavator loader as claimed in claim 6, characterized in that: One end of the second active chamber is also connected to the two-position three-way valve through a second one-way valve.

10. The novel hydraulic brake system for an excavator loader as claimed in claim 1, characterized in that: There are two brakes.

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