CN216642906U - Hydraulic braking system of electric wheeled vehicle - Google Patents

Abstract

The utility model discloses a hydraulic braking system of an electric wheeled vehicle, which comprises an oil tank, a hydraulic pump, a pilot overflow valve, a two-way liquid filling valve, a two-way braking valve, a service braking mechanism and a parking braking mechanism, wherein the oil tank, the hydraulic pump, the pilot overflow valve, the two-way liquid filling valve, the two-way braking valve, the service braking mechanism and the parking braking mechanism are connected by a hydraulic oil path; the hydraulic pump comprises a motor oil pump and a gear oil pump which are connected in parallel and are respectively used for providing power for the hydraulic braking system when the vehicle runs normally and runs silently. The two hydraulic pumps work alternately, and when one hydraulic pump fails, the other hydraulic pump can work normally, so that the reliability of the brake system is ensured. The system has small installation space and simple structure. The emergency braking valve block is adopted, so that parking braking is automatically completed when the system pressure is lower than the set pressure, the reaction speed is high, and the braking is flexible.

Description

Hydraulic braking system of electric wheeled vehicle

Technical Field

The utility model relates to the technical field of electric vehicle braking devices, in particular to a hydraulic braking system of an electric wheeled vehicle.

Background

The development of the wheeled vehicle in the modern sense begins in the 60 th 20 th century, the real development is a modern road traffic network which is commonly built in all countries after the 70 th century, external conditions are created for the implementation of quick maneuvering operation of the wheeled vehicle, and meanwhile, the rapid development of the modern automobile industry also provides a mature technical basis for the development of the wheeled vehicle. Wheeled vehicles are thus entering a rapid development phase and the equipment in the military is also increasing in size in the major countries of the world.

In the 21 st century, wheeled vehicles are required to have the characteristics of high maneuvering speed, low oil consumption, low guarantee dependence, comfortable riding and the like, and energy consumption of brakes is required to be increased sharply with the increase of vehicle speed and vehicle weight.

At present, the brake system of domestic vehicles mostly adopts a pneumatic oil brake mode, and the defects of the pneumatic oil brake system are as follows: the required installation space is large, and the structure is complex; the wheel set of the electric wheel is driven by the wheel hub motor, so that the installation space of the brake is limited, and the brake arranged beside the wheel can not meet the requirements of driving and parking braking at the same time; slow reaction speed, soft brake and small force.

In conclusion, it is particularly important to develop a brake system suitable for modern wheeled vehicles.

SUMMERY OF THE UTILITY MODEL

In view of the above situation, the present invention aims to provide a hydraulic braking system for an electric wheeled vehicle, which solves the problems of large installation space and complex structure required by a pneumatic oil braking method; slow reaction speed, soft brake, small force and the like; meanwhile, the problem that the installation space of the electric wheel of the hub motor is small and the existing brake cannot meet the installation requirement is solved. The purpose is realized by the following technical scheme:

a hydraulic braking system of an electric wheeled vehicle comprises an oil tank, a hydraulic pump, a flow stabilizing valve, a pilot overflow valve, a two-way liquid filling valve, a two-way braking valve and a service braking mechanism which are connected by a hydraulic oil way; the hydraulic pump comprises a motor oil pump and a gear oil pump which are connected in parallel, one end of the motor oil pump and one end of the gear oil pump are connected to the oil tank, the other ends of the motor oil pump and the gear oil pump are connected to a precision filter and a one-way valve respectively, then the motor oil pump and the gear oil pump are converged into an oil path through a flow stabilizing valve, and the converged oil path enters a two-path liquid filling valve through a pilot overflow valve and then is connected to a driving brake mechanism.

The engine-driven gear oil pump is used for supplying hydraulic oil to the hydraulic brake system when the vehicle runs normally, and the motor oil pump driven by the motor is used for supplying power to the hydraulic brake system when the vehicle runs in a silent mode. The two hydraulic pumps work alternately, and when one hydraulic pump fails, the other hydraulic pump can work normally, so that the reliability of the brake system is ensured.

Preferably, the service brake mechanism comprises a front axle service brake circuit and a middle rear axle service brake circuit.

Furthermore, the front axle service brake circuit comprises a front axle hydraulic oil circuit output by the port A of the two-way liquid charging valve, a front axle energy accumulator is arranged on the front axle hydraulic oil circuit and connected to the port P of the two-way brake valve, and the port A of the two-way brake valve is connected to a brake of the front axle after coming out.

Furthermore, the middle and rear axle service brake circuit comprises a middle and rear axle hydraulic oil way output by the port A of the two-way liquid charging valve, a rear axle energy accumulator and a pressure gauge are arranged on the middle and rear axle hydraulic oil way, the middle and rear axle hydraulic oil way is connected to the port P of the two-way brake valve, and the port A of the two-way brake valve is connected to a brake of the middle axle and a brake of the rear axle respectively.

Preferably, the brake of the front axle, the brake of the middle axle and the brake of the rear axle are wet disc brakes;

preferably, a pressure gauge is arranged on the front axle hydraulic oil circuit and between the brake and the two-way brake valve.

Preferably, a service brake lamp switch is arranged on the hydraulic oil circuit of the middle rear axle and between the brake and the two-way brake valve. The brakes of the front axle, the middle axle and the rear axle are hydraulically driven, act on all wheels and are controlled by a brake pedal valve in a cab, and the front axle and the rear axle are separately braked independently.

Further, electronic wheeled vehicle hydraulic braking system still includes the parking braking return circuit, the parking braking return circuit includes the parking hydraulic oil circuit of the SW mouth output by double-circuit prefill valve, sets up parking energy storage ware and emergency braking valve piece on the parking hydraulic oil circuit, parking energy storage ware is connected to the A mouth of emergency braking valve piece, and parking hydraulic oil gets into parking brake through the manometer after coming out by the B mouth of emergency braking valve piece, the stopper sets up on every wheelset. The parking brake is arranged in an electric control switch in the cab for operation and is used during parking. And an emergency braking valve block is arranged, and when the system pressure is lower than the set pressure, the parking braking is automatically completed. The parking brake device can also be used as an emergency brake together with the service brake device.

Preferably, the parking brake is a disc spring type parking brake; the emergency brake valve block is connected with a parking brake alarm switch, an emergency brake switch and a low-voltage alarm switch.

Preferably, the double-circuit brake valve is an electric sensing double-circuit brake valve and comprises an electro-hydraulic brake pedal valve and an electric sensor for detecting the rotation angle of a pedal, wherein the electro-hydraulic brake pedal valve and the electric sensor are mutually connected;

the hydraulic braking system of the electric wheel type vehicle further comprises a controller, the controller is respectively connected with an electro-hydraulic brake pedal valve and an electric sensor of the electric sensing double-path brake valve, and the electric sensing double-path brake valve angle sensor feeds back a pedal opening degree signal to the controller, so that the controller controls the electric sensing double-path brake valve.

The controller is also connected with the oil pump, the two-way liquid charging valve and the emergency brake valve block respectively to control the actions of the two-way liquid charging valve and the emergency brake valve block.

Compared with the prior art, the utility model has the beneficial effects that:

1. the utility model provides a hydraulic braking system of an electric wheeled vehicle, which comprises a hydraulic pump driven by an engine and used for supplying hydraulic oil to the hydraulic braking system when the vehicle runs normally, and a hydraulic pump driven by a motor and used for supplying power to the hydraulic braking system when the vehicle runs quietly. The two hydraulic pumps work alternately, and when one hydraulic pump fails, the other hydraulic pump can work normally, so that the reliability of the brake system is ensured.

2. The braking system provided by the utility model adopts the wet disc type service brake, and has the advantages of small installation space and simple structure.

2. The utility model adopts hydraulic oil for control, and has the advantages of high reaction speed and flexible braking compared with the traditional gas cap oil braking mode.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the utility model, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the utility model and together with the description serve to explain the utility model and not to limit the utility model.

Fig. 1 is a schematic structural diagram of a hydraulic braking system of an electric wheeled vehicle provided by the utility model.

Wherein, 1, an oil tank; 2. an oil pump; 3. a precision filter; 4. a one-way valve; 5. a flow stabilizing valve; 6. a pilot overflow valve; 7. a two-way liquid filling valve; 8. a rear axle accumulator; 9. a front axle accumulator; 10. an electric sensing two-way brake valve; 11. a service brake light switch; 12. a wet disc brake; 13. an emergency braking valve block; 14. a parking brake alarm switch; 15. a parking accumulator; 16. an emergency brake switch; 17. a low-voltage alarm switch; 18. a disc spring parking brake; 19. an electrical sensor.

Detailed Description

It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the utility model as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the utility model. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

A hydraulic braking system of an electric wheeled vehicle is shown in figure 1 and comprises an oil tank 1, an oil pump 2, a precision filter 3, a one-way valve 4, a flow stabilizing valve 5, a pilot overflow valve 6, a two-way liquid charging valve 7, a rear axle energy accumulator 8, a front axle energy accumulator 9, an electric sensing two-way brake valve 10, a service brake lamp switch 11, a wet disc brake 12, an emergency brake valve block 13, a parking brake alarm switch 14, a parking energy accumulator 15, an emergency brake switch 16, a low-pressure alarm switch 17, a disc spring type parking brake 18 and an electric sensor 19;

the oil pump 2 comprises a motor oil pump and a gear oil pump which are connected in parallel, one end of the motor oil pump and one end of the gear oil pump are connected to the oil tank 1, the other ends of the motor oil pump and the gear oil pump are connected to a precision filter 3 and a one-way valve 4 respectively, then the motor oil pump and the gear oil pump are converged into an oil path through a flow stabilizing valve 5, one path of the converged oil path enters a double-path liquid filling valve 7 through a pilot overflow valve 6, hydraulic oil is divided into three paths at the double-path liquid filling valve 7, one path of the hydraulic oil enters a front axle service braking circuit, the other path of the hydraulic oil enters a rear axle service braking circuit, and the other path of the hydraulic oil enters a parking braking circuit.

The front axle service braking loop comprises a front axle hydraulic oil circuit output by an A2 port of the two-way liquid charging valve 7, a front axle energy accumulator 9 is arranged on the front axle hydraulic oil circuit and connected to a P port of the electric sensing two-way braking valve 10, the A port of the electric sensing two-way braking valve 10 is connected to a brake of a front axle, as a typical embodiment, the brake of the front axle adopts a wet disc type brake 12, and a pressure gauge 9 is arranged on the front axle hydraulic oil circuit and between the brake and the electric sensing two-way braking valve 10.

The middle and rear axle service brake circuit comprises a middle and rear axle hydraulic oil way output by an A1 port of the two-way liquid charging valve 7, a rear axle energy accumulator 8 is arranged on the middle and rear axle hydraulic oil way and connected to a P port of the two-way brake valve 10, the A port of the two-way brake valve 10 is connected to a brake of the middle axle and a brake of the rear axle respectively, as a typical embodiment, the brake of the middle axle and the brake of the rear axle adopt wet disc type brakes 12, and a service brake lamp switch 11 is arranged on the middle and rear axle hydraulic oil way and between the brake and the two-way brake valve 10.

Parking brake return circuit includes the parking hydraulic oil circuit by the SW mouth output of double-circuit prefill valve 7, sets up parking energy storage ware 15 and emergency braking valve piece 13 on the parking hydraulic oil circuit, parking energy storage ware 15 is connected to the A mouth of emergency braking valve piece 13, and parking hydraulic oil gets into parking brake through manometer 9 after coming out by the B mouth of emergency braking valve piece 13, the stopper sets up on every wheelset, as a typical embodiment, parking brake is disc spring formula parking brake 18. The emergency brake valve block 13 is connected with a parking brake alarm switch 14, an emergency brake switch 16 and a low-voltage alarm switch 17.

As a typical embodiment, the electric sensing dual-way brake valve 10 is an electric sensor 19 connected with an electro-hydraulic brake pedal valve and used for detecting the rotation angle of a pedal, the electric sensor 19 is an angle sensor, the resistance value is converted into the angle of the pedal of the electric sensing dual-way brake valve 10 stepped by a driver by changing the resistance value of a sliding resistor, when the angle of the pedal of the electric sensing dual-way brake valve 10 stepped by manpower is less than or equal to 6 degrees, a port P and a port a of the electric sensing dual-way brake valve 10 are not communicated, the port a does not contain hydraulic oil and is mainly braked by the reverse dragging of a motor, when the stepping angle is greater than 6 degrees, the port P and the port a of the electric sensing dual-way brake valve 10 are communicated, the port a has hydraulic oil flowing out, the hydraulic oil acts on a wet disc brake to enable the mechanical brake to act, and at the same time, the reverse dragging of the motor and the mechanical brake act simultaneously.

The connection mode of the electro-hydraulic brake pedal valve and the angle sensor is disclosed in the prior art, and the connection can also be carried out by referring to an electric control accelerator operating mechanism (publication number: CN203864455U) in a patent publication.

The hydraulic oil enters a rear axle service energy accumulator 8 from a port A1 of the two-way charging valve 7, enters a port P1 of an electric sensing two-way brake valve 10 installed in a cab after exiting from the rear axle service energy accumulator 8, enters a wet disc brake 12 of a middle and rear axle through a service brake lamp switch 11 after exiting from a port A1 of the electric sensing two-way brake valve 10, and directly returns to the oil tank 1 after exiting from a port T1 of the electric sensing two-way brake valve 10.

The hydraulic control system enters a front axle accumulator 9 from a port A2 of the two-way charging valve 7, enters a port P2 of an electric sensing two-way brake valve 10 arranged in a cab after exiting from the front axle accumulator 9, enters a wet disc brake 12 of a front axle after exiting from a port A2 of the electric sensing two-way brake valve 10, and directly returns to a tank 1 after exiting from a port T2 of the electric sensing two-way brake valve 10. Hydraulic oil enters a port P of an emergency braking valve block 13 from a port SW of the two-way liquid filling valve 6, and after the hydraulic oil exits from a port B of the emergency braking valve block 13, the hydraulic oil respectively enters disc spring type parking brakes 18 of all the wheel sets through a pressure gauge 9.

The hydraulic braking system further comprises a controller, the controller is respectively connected with an electro-hydraulic brake pedal valve and an electric sensor of the electric sensing double-path brake valve 10, and signals of pedal opening degree are fed back to the controller through an angle sensor of the electric sensing double-path brake valve 10, so that the controller controls the electric sensing double-path brake valve 10.

The controller is also connected with the oil pump, the two-way liquid filling valve and the emergency brake valve block respectively to control the actions of the two-way liquid filling valve and the emergency brake valve block.

The working process of the brake system provided by the utility model is as follows:

service braking: when the pedal of the electric sensing two-way brake valve is stepped on manually, a valve port is opened to conduct a port P and a port A of the valve piece, and hydraulic oil enters a pipeline behind the electric sensing two-way brake valve and reaches a brake, so that service braking is realized;

parking and braking: the driver presses down the parking brake rocker switch of driver's cabin for the valve block is promptly braked, makes the P mouth and the B mouth of valve member switch on, and oil outlet B mouth is crossed oil, and hydraulic oil leads to parking brake, thereby makes disc spring formula parking brake's disc spring open, realizes parking brake.

Silent running: in order to avoid the detection technology of the heat sensing technology and hide the vehicle, the pure electric mode is adopted for driving, and the operation is as follows: the engine is turned off, high voltage is supplied to the vehicle, the electric hydraulic pump is started, the electric hydraulic pump starts to work, and a hydraulic oil source of a braking system is converted into an electric hydraulic pump for supplying oil through a connected flow stabilizing valve, so that the braking in a silent driving state is realized.

The utility model has the beneficial effects that:

1. the braking system provided by the utility model adopts the wet disc type service brake, and has the advantages of small installation space and simple structure.

2. The utility model adopts hydraulic oil for control, and has the advantages of high reaction speed and flexible braking compared with the traditional gas cap oil braking mode. The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A hydraulic braking system of an electric wheeled vehicle is characterized by comprising an oil tank, a hydraulic pump, a flow stabilizing valve, a pilot overflow valve, a two-way liquid filling valve, a two-way braking valve and a service braking mechanism which are connected by a hydraulic oil way; the hydraulic pump comprises a motor oil pump and a gear oil pump which are connected in parallel, one end of the motor oil pump and one end of the gear oil pump are connected to the oil tank, the other ends of the motor oil pump and the gear oil pump are connected to a precision filter and a one-way valve respectively, then the motor oil pump and the gear oil pump are converged into an oil path through a flow stabilizing valve, the converged oil path enters a double-path liquid filling valve through a pilot overflow valve and then is connected to a driving brake mechanism.

2. The hydraulic electric wheeled vehicle braking system of claim 1, wherein the dual brake valve is an electric sensing dual brake valve including an electro-hydraulic brake pedal valve and an electric sensor coupled to the electro-hydraulic brake pedal valve, the electric sensor being an angle sensor.

3. A hydraulic braking system for electrically powered wheeled vehicles as claimed in claim 2 wherein the service braking mechanism includes a front axle service braking circuit and a rear axle service braking circuit.

4. A hydraulic braking system for electrically powered wheeled vehicles as claimed in claim 3 wherein the front axle service braking circuit includes a front axle hydraulic fluid circuit from port a2 of the dual charge valve, a front axle accumulator is provided in the front axle hydraulic fluid circuit and connected to port P of the electric sensing dual brake valve, and a brake connected to the front axle from port a of the electric sensing dual brake valve.

5. An electrically powered wheeled vehicle hydraulic braking system according to claim 4 characterised in that the intermediate rear axle service braking circuit includes an intermediate rear axle hydraulic fluid circuit output from port A1 of the dual charge valve, the intermediate rear axle hydraulic fluid circuit having a rear axle accumulator disposed thereon connected to port P of the electrically sensitive dual brake valve and from port A of the dual brake valve to the brake of the intermediate axle and the brake of the rear axle respectively.

6. An electrically powered wheeled vehicle hydraulic braking system according to claim 5 wherein the brakes of the front axle, the brakes of the intermediate axle and the brakes of the rear axle are wet disc brakes.

7. The hydraulic brake system for electric wheeled vehicles according to claim 6, wherein a service light switch is provided on the hydraulic oil path of the middle rear axle and between the brake and the two-way brake valve.

8. The hydraulic braking system for electric wheeled vehicles as claimed in claim 7, further comprising a parking braking circuit, wherein the parking braking circuit comprises a parking hydraulic oil path output from the SW port of the two-way charging valve, a parking accumulator and an emergency braking valve block are arranged on the parking hydraulic oil path, the parking accumulator is connected to the a port of the emergency braking valve block, the parking hydraulic oil enters the parking brake after coming out from the B port of the emergency braking valve block, and the parking brake is arranged on each wheel set.

9. An electric wheeled vehicle hydraulic brake system as claimed in claim 8, characterised in that the parking brake is a disc spring parking brake; the emergency brake valve block is connected with a parking brake alarm switch, an emergency brake switch and a low-voltage alarm switch.

10. Hydraulic brake system for electrically powered wheeled vehicles according to claim 9,

the hydraulic braking system of the electric wheeled vehicle further comprises a controller, and the controller is respectively connected with an electro-hydraulic brake pedal valve and an electric sensor of the electric sensing double-path brake valve;

the controller is also connected with the oil pump, the two-way liquid filling valve and the emergency brake valve block respectively to control the actions of the two-way liquid filling valve and the emergency brake valve block.

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