Vehicle hydraulic brake device with mechanical backup brake and application

Abstract

The invention discloses a vehicle hydraulic braking device with a mechanical backup braking function and application. The device comprises a hydraulic braking unit and a mechanical backup braking unit. The hydraulic brake unit comprises a brake piston and a brake block which are arranged in a brake shell; a hydraulic cavity between the brake piston and the brake piston cylinder is connected with a hydraulic oil way control unit and drives the brake piston and the brake block through hydraulic pressure. The mechanical backup braking unit comprises an energy storage spring, a backup braking piston rod and an unloading unit which are arranged in a backup braking shell; an energy storage hydraulic cavity is formed between the backup brake piston rod and the brake shell and connected with an energy storage oil way. The energy storage hydraulic cavity is connected with the unloading unit, and hydraulic oil in the energy storage hydraulic cavity is discharged through the unloading unit; and the rod part of the backup brake piston can be introduced into the hydraulic cavity of the brake shell to drive the brake piston and the brake block. According to the device, when a hydraulic braking oil way breaks down, the reliability and safety of braking can be improved by braking wheels through the mechanical backup braking unit.

Description

Technical Field

[0001] The present invention relates to the field of vehicle braking, and in particular to a vehicle hydraulic braking device with mechanical backup braking and applications thereof. Background Art

[0002] With the continuous development of modern industry and the increasing busyness of transportation, the reliability and safety of vehicle braking devices have become crucial factors. Among the numerous braking systems, hydraulic braking devices are widely used in various vehicles and mechanical equipment due to their efficient braking force transmission and relatively precise control performance.

[0003] At present, traditional hydraulic brake devices mainly rely on hydraulic systems to achieve braking functions. The hydraulic brake system is operated by the driver stepping on the brake pedal, which pushes the piston in the brake master cylinder through a mechanical linkage mechanism, causing the hydraulic oil to flow in the pipeline and push the brake piston, thereby causing the brake friction pad to contact the brake disc or brake drum to generate friction, thereby achieving braking of the vehicle or equipment. This hydraulic braking method can provide relatively reliable braking performance under normal circumstances.

[0004] However, the existing hydraulic brake devices also have some shortcomings. On the one hand, the hydraulic brake system has high requirements for the quality and pressure stability of the hydraulic oil. If the hydraulic oil leaks, is contaminated, or has insufficient pressure, it will seriously affect the braking effect and even cause brake failure. On the other hand, the components of the hydraulic brake system are relatively complex, including the brake master cylinder, brake wheel cylinder, brake pipeline, etc. Once any of these components fails, the entire brake system may not work properly.

[0005] In practical applications, especially in some occasions with extremely high safety requirements, such as commercial vehicles, special vehicles and some key industrial equipment, relying solely on hydraulic brakes may not meet safety requirements. Once the hydraulic brake system fails, it may cause serious accidents, resulting in casualties and property losses.

[0006] Therefore, in order to improve the reliability and safety of the braking device, there is an urgent need for a new type of braking device that can provide an effective backup braking function when a hydraulic braking system fails to ensure that the vehicle or equipment can stop safely. Summary of the invention

[0007] In order to address the deficiencies in the prior art, the present application proposes a vehicle hydraulic brake device with mechanical backup braking and its application. When a fault occurs in the hydraulic brake oil circuit and the brake pressure cannot be established, the device can brake the wheels through the mechanical backup brake device, thereby achieving the purpose of backup braking in hydraulic braking and avoiding vehicle driving accidents.

[0008] The technical solution adopted by the present invention is as follows:

[0009] A vehicle hydraulic brake device with mechanical backup brake, comprising: a hydraulic brake unit and a mechanical backup brake unit;

[0010] The hydraulic brake unit comprises a brake housing, a hydraulic oil circuit control unit, and a brake unit;

[0011] A brake piston cylinder is provided inside the brake housing;

[0012] The brake unit comprises a brake piston and a brake pad; the brake piston is movably mounted in the brake piston cylinder, and a hydraulic chamber is formed between one end of the brake piston and the brake piston cylinder; the brake pad is movably mounted on the other end of the brake piston;

[0013] The hydraulic oil circuit includes a valve core hole, a valve core, a valve core electromagnetic push rod, an oil inlet, an oil return port, a brake main oil channel, and an energy storage oil channel; the oil inlet, the oil return port, and the brake main oil channel are all connected to the valve core hole; the valve core electromagnetic push rod is provided with two ends of the valve core hole, and the valve core is movably installed in the valve core hole, and the valve core electromagnetic push rod changes the position of the valve core in the valve core hole to control the opening or closing of the oil return port, the brake main oil channel, and the energy storage oil channel;

[0014] The mechanical backup brake unit includes a backup brake housing, an energy storage spring, a backup brake piston rod and a unloading unit; the backup brake housing is fixedly connected to the brake housing, and a cylinder is provided inside the backup brake housing; the piston portion of the backup brake piston rod contacts the inner wall of the cylinder through the energy storage spring, and an energy storage hydraulic chamber is provided between the rod portion of the backup brake piston rod and the brake housing, and the energy storage hydraulic chamber is connected to the energy storage oil channel; the energy storage hydraulic chamber is connected to the unloading unit, and the hydraulic oil in the energy storage hydraulic chamber is discharged through the unloading unit.

[0015] Furthermore, the two ends of the valve core are shoulder structures, and the two shoulders are connected by a valve core shaft; during the movement of the valve core, when the shoulder moves to the hole position of the oil inlet, oil return port, brake main oil channel or energy storage oil channel, the hole position will be closed; when the shoulder leaves the hole position, the hole position restores the passage.

[0016] Furthermore, a left return spring and a right return spring are respectively arranged on the left and right sides of the valve core, one end of the left return spring and the right return spring respectively contacts the end surface of the valve core hole, and the other end contacts the end surfaces of both sides of the valve core.

[0017] Furthermore, the unloading unit includes an unloading valve core hole, an unloading valve core, and an unloading solenoid push rod. The unloading valve core hole is provided with an unloading oil passage II and an unloading oil passage I, and the unloading oil passage I is connected to the energy storage hydraulic chamber; an unloading solenoid push rod is arranged on the opening side of the unloading valve core hole, and the unloading valve core is movably installed in the unloading valve core hole, and one side of the unloading valve core is connected to the unloading solenoid push rod. The unloading valve core is driven to reciprocate in the unloading valve core hole by the unloading solenoid push rod, thereby changing the position of the unloading valve core in the unloading valve core hole, and adjusting the closure or conduction of the unloading oil passage I and the unloading oil passage II.

[0018] Furthermore, a unloading valve return spring, an unloading valve core and an unloading electromagnet push rod are sequentially arranged in the unloading valve core hole from the closed end to the open end, and the three are in contact with each other.

[0019] Furthermore, a groove is arranged on the inner wall of the through hole on the brake housing along the circumferential direction, and a sealing ring is installed in the groove.

[0020] Furthermore, a groove is provided on the side wall of the piston portion of the brake piston rod, and a sealing ring is installed in the groove.

[0021] A vehicle, whose braking system adopts the above-mentioned vehicle hydraulic braking device with mechanical backup braking.

[0022] Furthermore, the oil inlet is connected to the high-pressure oil circuit of the vehicle hydraulic system, the oil return port is connected to the hydraulic oil tank, and the unloading oil passage II is connected to the vehicle hydraulic system oil tank.

[0023] Furthermore, the electromagnet push rods in the vehicle hydraulic brake device are all connected to the controller signal, and the controller regulates the working state of the electromagnet push rods according to the vehicle state.

[0024] Beneficial effects of the present invention:

[0025] (1) The present invention is a vehicle hydraulic brake device with mechanical backup brake. By controlling the electromagnets on the left and right sides, the brake can meet the needs of different working conditions, such as normal driving without braking, normal braking, and brake backup braking. The hydraulic brake device uses a solenoid valve for brake control, which can achieve precise regulation of the braking process. The solenoid valve has the characteristics of fast response speed and high control accuracy. It can accurately adjust the flow and pressure of the hydraulic oil according to different driving conditions and driver needs, thereby achieving precise control of the braking force. Whether it is light braking during daily driving or full braking in an emergency, it can ensure stable and reliable braking effect. At the same time, precise braking control can also reduce energy loss during braking and improve the fuel economy of the vehicle.

[0026] (2) In the present application, by controlling the right electromagnet, the braking system can store energy in the energy storage spring in the backup braking device before braking, ensuring that the backup braking device can be put into operation quickly when the normal braking device fails, without additional startup time, greatly improving the reliability and safety of braking. Compared with other braking systems, this advance energy storage method can provide timely braking assistance at critical moments and effectively avoid accidents caused by braking system failures. When the normal braking device fails, the backup braking device uses the energy stored in the spring to push the brake piston for braking. It is independent of the normal braking system. Even under complex working conditions, such as when the conventional braking system fails, the backup braking device can still maintain stable working performance and provide reliable braking protection for the vehicle. Compared with the traditional hydraulic braking system without backup, this hydraulic braking device with backup braking is a redundant braking design, which is equivalent to double protection, greatly reducing the risk of accidents caused by braking system failures, and providing a more solid protection for the safety of life and property of drivers and passengers.

[0027] (3) Since the brake device adopts a combination of mechanical backup and solenoid valve control, its structure is relatively simple and maintenance is more convenient. In daily use, it is only necessary to regularly inspect and maintain the solenoid valve, hydraulic pipeline and backup brake device to ensure the normal operation of the brake system. Compared with complex electronic mechanical brake systems, this simple structural design reduces maintenance costs and technical difficulties and improves the convenience of vehicle use. At the same time, for different types of vehicles, the brake device can also be adjusted and optimized accordingly, improving its versatility and adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 The present invention is a structural diagram of a vehicle hydraulic brake device with mechanical backup brake.

[0029] Figure 2 This is the valve core structure diagram.

[0030] Figure 3 This is the backup brake piston rod structure diagram.

[0031] Figure 4 This is a structural diagram of the backup brake housing.

[0032] Figure 5 This is the brake housing structure diagram.

[0033] Figure 6 It is the energy storage principle diagram of energy storage spring.

[0034] Figure 7 This is the normal braking principle diagram.

[0035] Figure 8This is the backup brake schematic.

[0036] Fig. 9 This is an application case diagram.

[0037] Fig.10 This is an application case - energy storage spring energy storage principle diagram.

[0038] Fig.11 This is an application case - normal braking schematic.

[0039] Fig.12 This is an application case - mechanical backup braking principle.

[0040] In the figure, 1, backup brake housing; 2, energy storage spring; 3, backup brake piston rod; 4, sealing ring I; 5, brake housing; 6, left electromagnet push rod; 7, left return spring; 8, energy storage oil channel; 9, valve core; 10, oil inlet; 11, brake main oil channel; 12, oil return port; 13, right return spring; 14, right electromagnet push rod; 15, left brake pad; 16, right brake pad; 17, unloading oil channel I; 18, unloading electromagnet push rod; 19, unloading oil channel II; 20, Unloading valve core; 21. Unloading valve return spring; 22. Sealing ring II; 23. Brake piston; 24. Shoulder; 25. Valve core shaft; 26. Piston; 27. Piston rod; 28. Cylinder; 29. ​​Unloading valve core hole; 30. Valve core hole; 31. Brake piston cylinder; 32. Left brake pad groove; 33. Right brake pad groove; 34. High-pressure oil circuit of vehicle hydraulic system; 35. Brake disc of wheel; 36. Center line of brake disc; 37. Through hole; 38. Moving pair; 39. Controller. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0042] The present application is designed to provide a vehicle hydraulic brake device with a mechanical backup brake, the structure of which is as follows: Figure 1-5 As shown, it includes: a hydraulic brake unit and a mechanical backup brake unit.

[0043] The hydraulic brake unit includes a brake housing 5, a hydraulic oil circuit control unit, and a brake unit; wherein the brake unit includes a brake piston 23 and a brake pad. The brake pad is symmetrically provided with two pieces, namely a left brake pad 15 and a right brake pad 16.

[0044] A brake piston cylinder 31 is provided inside the brake housing 5, and the brake piston cylinder 31 is a semi-enclosed structure; the brake piston 23 is movably installed inside the brake piston cylinder 31; one end of the brake piston 23 forms a hydraulic cavity with the inner wall of the brake piston cylinder 31, and the other end of the brake piston 23 can extend from the opening side of the brake piston cylinder 31. A left brake block 15 is movably installed outside the opening side of the brake piston cylinder 31, and a right brake 16 is provided at a position opposite to the left brake block 15, and the right brake 16 is fixedly connected to the brake housing 5.

[0045] The hydraulic oil circuit control unit includes a valve core hole 30, a valve core 9, a valve core solenoid push rod, an oil inlet 10, an oil return port 12, a brake main oil passage 11, and an energy storage oil passage 8. The valve core hole 30 is provided inside the brake housing 5, and the valve core hole 30 is provided with an oil inlet 10 and an oil return port 12. The valve core hole 30 is connected to the hydraulic chamber of the brake piston cylinder 31 through the brake main oil passage 11.

[0046] A valve core 9 is movably installed inside the valve core hole 30, and both ends of the valve core 9 are shaft shoulder 24 structures, and the two shaft shoulders 24 are connected by a valve core shaft 25; during the movement of the valve core 9, if the shaft shoulder 24 of the valve core 9 moves to the corresponding hole position (such as the oil inlet 10, the oil return port 12 or the brake main oil channel 11), the hole position will be closed; when the shaft shoulder 24 leaves the hole position, the hole position restores the passage, thereby realizing the control of the oil circuit.

[0047] Valve core electromagnetic push rods are arranged at both ends of the valve core hole 30, and the valve core electromagnetic push rods are used to push the valve core 9 to move in the valve core hole 30, change the position of the valve core 9 and thus realize the control of the on-off of the oil circuit.

[0048] In this embodiment, a left electromagnet push rod 6 and a right electromagnet push rod 14 are respectively arranged on the left and right sides of the valve core hole 30; by controlling the extension or shortening of the left electromagnet push rod 6 and the right electromagnet push rod 14, the position of the valve core 9 in the valve core hole 30 can be adjusted.

[0049] In this embodiment, in order to achieve rapid resetting of the valve core 9, the present application sets valve core resetting springs at both ends of the valve core 9, more specifically, sets a left resetting spring 7 and a right resetting spring 13 at the left and right sides of the valve core 9, one end of the left resetting spring 7 and the right resetting spring 13 are in contact with the end surface of the valve core hole 30, and the other end is in contact with the end surfaces of both sides of the valve core 9. In the initial position, the left electromagnet push rod 6 and the right electromagnet push rod 14 are both at a certain stroke distance from both ends of the valve core 9, and do not contact the end surfaces of both sides of the valve core 9; at this time, the left resetting spring 7 and the right resetting spring 13 are also at natural length; when the electromagnet push rod on one side pushes the valve core 9 to move to the other side, the resetting spring on the same side as the working electromagnet push rod is stretched, and the resetting spring on the other side is compressed; if the pushing process is finished, when the electromagnet push rod retracts and resets, the valve core 9 is driven back to the initial position under the action of the resetting spring.

[0050] The mechanical backup brake unit includes a backup brake housing 1, an energy storage spring 2, a backup brake piston rod 3 and a unloading unit; wherein the backup brake housing 1 is fastened and installed with the brake housing 5 by bolts; the interior of the backup brake housing 1 is a semi-enclosed cylinder 28 structure, and the center line of the cylinder 28 is coaxial with the center line of the brake piston cylinder 31. The backup brake piston rod 3 includes a piston part and a rod part, and the piston part is movably installed in the cylinder 28. The energy storage spring 2 is installed between the closed end of the cylinder 28 and one side of the piston part, and the other side of the piston part and the brake housing 5 are connected to the valve core hole 30 through the energy storage oil channel 8. The rod part of the backup brake piston rod 3 is located in the energy storage hydraulic chamber, and the rod part extends from the through hole 37 on the brake housing 5 to the hydraulic chamber of the brake piston cylinder 31, realizing a movable connection with the brake housing 5.

[0051] The unloading unit includes an unloading valve core hole 29, an unloading valve core 20, and an unloading solenoid push rod 18; wherein, the backup brake housing 1 is provided with a semi-enclosed unloading valve core hole 29, the unloading valve core hole 29 is connected to the energy storage hydraulic chamber through the unloading oil passage I17, and the unloading valve core hole 29 is also provided with an unloading oil passage II 19. An unloading solenoid push rod 18 is provided on the opening side of the unloading valve core hole 29, and the unloading valve core 20 is movably installed in the unloading valve core hole 29, and one side of the unloading valve core 20 is connected to the unloading solenoid push rod 18, and the unloading valve core 20 is driven to reciprocate in the unloading valve core hole 29 by the unloading solenoid push rod 18, so as to change the position of the unloading valve core 20 in the unloading valve core hole 29. In the process of the unloading valve core 20 moving along the unloading valve core hole 29, the unloading valve core 20 will close or conduct the unloading oil passage I17 or the unloading oil passage II 19.

[0052] In this embodiment, in order to achieve rapid resetting of the unloading valve core 20, the unloading valve resetting spring 21, the unloading valve core 20 and the unloading solenoid push rod 18 are arranged in sequence from the closed end to the open end in the unloading valve core hole 29, and the three are in contact with each other; the unloading valve core 20 is pushed inward by the unloading solenoid push rod 18 to move along the unloading valve core hole 29, and the unloading valve resetting spring 21 is compressed at the same time; when the unloading solenoid push rod 18 retracts, the unloading valve core 20 is pushed to reset under the action of the unloading valve resetting spring 21.

[0053] In this embodiment, in order to ensure the sealing between the hydraulic chamber and the energy storage hydraulic chamber, a groove is provided on the inner wall of the through hole 37 on the brake housing 5 along the circumferential direction, and a sealing ring 22 is installed in the groove.

[0054] In this embodiment, in order to ensure the sealing between the energy storage hydraulic chamber and the chamber where the energy storage spring 2 is located, a groove is provided on the side wall of the piston portion of the brake piston rod 3, and a sealing ring 4 is installed in the groove.

[0055] In this embodiment, the oil inlet 10 is connected to the high-pressure oil circuit 34 of the vehicle hydraulic system, the oil return port 12 is connected to the hydraulic oil tank, and the unloading oil passage II 19 is connected to the vehicle hydraulic system tank.

[0056] The working principle of the present invention is further described below in conjunction with the working principle diagram of the hydraulic brake device with mechanical backup brake designed by the present invention:

[0057] (1) Principle of energy storage spring

[0058] like Figure 6 As shown, when the right electromagnet push rod 14 is energized, the right electromagnet push rod 14 extends and pushes the valve core 9 to move to the left, the oil inlet 10 is connected with the energy storage oil channel 8, and the main brake oil channel 11 is connected with the return oil port 12; at this time, the pressure oil enters the energy storage oil channel 8 from the oil inlet 10, and enters the hydraulic oil tank of the cylinder 28 through the energy storage oil channel 8. Under the action of the high-pressure oil, the backup brake piston rod 3 moves to the left, compressing the energy storage spring 2, so that the energy storage spring 2 stores energy; at the same time, the push rod of the brake piston rod 3 is away from the end face of the brake piston 23.

[0059] (2) Principle of brake non-braking condition

[0060] like Figure 1 As shown, when the left solenoid push rod 6 and the right solenoid push rod 14 are both in non-powered working condition, the valve core 9, under the action of the left return spring 7 and the right return spring 13, the shaft shoulder of the valve core 9 separates the oil inlet 10 and the energy storage oil channel 8, and at the same time separates the oil inlet 10 and the main brake oil channel 11, and the oil return port 12 is connected to the main brake oil channel 11.

[0061] At this time, the pressure in the brake piston cylinder 31 is in a unloading state, and the pressure is approximately 0; the thrust of the brake piston 23 on the left brake pad 15 is 0, and the brake is in a non-braking condition.

[0062] (3) Brake normal braking principle

[0063] like Figure 7 As shown, when the hydraulic system of the vehicle is normal, when the left electromagnet push rod 6 is energized, the left electromagnet push rod 6 extends and pushes the valve core 9 to move a distance to the right. At this time, the shaft shoulder on the valve core 9 separates the return oil port 12 from the main brake oil channel 11, and at the same time separates the oil inlet 10 from the energy storage oil channel 8. At this time, the oil inlet 10 and the main brake oil channel 11 are in a connected state; the high-pressure oil at the oil inlet 10 enters the brake piston cylinder 31 through the main brake oil channel 11. Under the action of the high-pressure oil, the brake piston 23 moves to the left and pushes the left brake block 15 to move a distance X to the left, completing the braking action.

[0064] (4) Brake backup braking condition

[0065] like Figure 8 As shown, when the hydraulic system of the vehicle fails and cannot supply high-pressure oil to the oil inlet 10, the unloading electromagnet push rod 18 is energized, the unloading electromagnet push rod 18 extends and pushes the unloading valve core 20 to move a distance to the right. At this time, the unloading oil channel I17 and the unloading oil channel II 19 are connected, and the energy-accumulated high-pressure oil in the cylinder 28 of the backup brake housing 1 flows out from the unloading oil channel 19. There is no high-pressure oil in the cylinder 28. Under the thrust of the energy storage spring 2, the backup brake piston rod 3 moves to the right, contacts and pushes the brake piston 23 to move to the right, and the brake piston 23 pushes the left brake block 15 to move a distance X to the left, completing the backup braking action.

[0066] Application examples:

[0067] The application of the vehicle hydraulic brake device with mechanical backup brake described in the present invention in a vehicle aims to improve the reliability and stability of the braking system, enable the vehicle to meet different road conditions and driving requirements, and ensure the safety performance of the vehicle.

[0068] Specific implementation: Fig. 9As shown, a vehicle hydraulic brake device with mechanical backup brake designed by the present invention is installed on the vehicle chassis through a moving pair 38, the brake disc 35 of the vehicle wheel is installed between the left brake block 15 and the right brake block 16, and the end surface of the brake block 15 and the end surface of the brake disc 35 are in a parallel state, and the moving direction of the moving pair 38 is parallel to the center line 36 of the brake disc; the brake housing oil inlet 10 is connected to the vehicle hydraulic system high-pressure oil circuit 34 through a hydraulic hose, the oil return port 12 is connected to the hydraulic oil tank through a hydraulic hose, and the unloading oil channel II 19 is connected to the vehicle hydraulic system tank through a hydraulic hose; the controller 39 is connected to the left electromagnet push rod 6, the right electromagnet push rod 14, and the unloading electromagnet push rod 18 through a signal line;

[0069] Purpose of the application case: To realize the application of the designed hydraulic brake device with mechanical backup brake on the vehicle to meet the braking performance and ensure vehicle safety.

[0070] The first step, such as Fig.10 As shown, the working principle of the energy storage spring in the application case is demonstrated. After the vehicle is started, the controller 39 sends a signal to the right electromagnet push rod 14, so that the right electromagnet push rod is energized, the right electromagnet push rod 14 extends and pushes the valve core 9 to move a distance to the left, the oil inlet 10 is connected with the energy storage oil channel 8, and the main brake oil channel 11 is connected with the oil return port 12; at this time, the pressure oil enters the energy storage oil channel 8 from the oil inlet 10, and enters the cylinder 28 of the backup brake housing through the energy storage oil channel 8. Under the action of the high-pressure oil, the backup brake piston rod 3 moves to the left, compressing the energy storage spring 2, so that the energy storage spring 2 is stored; at the same time, the push rod of the brake piston rod 3 is away from the end face of the brake piston 23, completing the energy storage action of the backup brake device.

[0071] The second step is, Fig.11 The figure shows how the application case works during normal braking. When the driver steps on the pedal, the controller 39 sends a signal to the left electromagnet push rod 6, so that the left electromagnet push rod is energized, and the left electromagnet push rod 6 extends and pushes the valve core 9 to move a distance to the right. At this time, the shaft shoulder on the valve core 9 separates the oil return port 12 from the main brake oil channel 11, and at the same time separates the oil inlet 10 from the energy storage oil channel 8. At this time, the oil inlet 10 and the main brake oil channel 11 are in a connected state; the high-pressure oil in the oil inlet 10 enters the brake piston cylinder 31 through the main brake oil channel 11. Under the action of the high-pressure oil, the brake piston 23 moves to the right and pushes the left brake block 15 to move a distance X to the right relative to the brake housing 5. When the end face of the left brake block 15 contacts the end face of the brake disc 35, under the reaction force of the brake disc 35, the brake housing 5 moves to the left along the direction of the moving pair 37, thereby driving the right brake block 16 to move to the left. The right brake block 16 contacts and presses the brake disc 35 to complete the braking action of the brake disc 35 of the wheel.

[0072] The third step is Fig.12 As shown, the principle of the backup brake device braking when the conventional brake fails in the application case is demonstrated. When the hydraulic system of the vehicle fails and cannot supply high-pressure oil to the oil inlet 10, when the driver's pedal brake signal is received, the controller 39 sends a signal to the unloading electromagnet push rod 18, so that the unloading electromagnet push rod 18 is energized, and the unloading electromagnet push rod 18 extends and pushes the unloading valve core 20 to move a distance to the left. At this time, the unloading oil channel I17 is connected to the unloading oil channel II 19, and the high-pressure oil stored in the cylinder 28 of the backup brake housing passes through the unloading oil channel I17 and the unloading oil channel II 19 flows out, and there is no high-pressure oil in the cylinder 28. Under the thrust of the energy storage spring 2, the backup brake piston rod 3 moves to the right, contacts and pushes the brake piston 23 to move to the right, and the brake piston 23 pushes the left brake block 15 to the left for a distance X. When the end face of the left brake block 15 contacts the end face of the brake disc 35, under the reaction force of the brake disc 35, the brake housing 5 moves to the left along the direction of the moving pair 37, thereby driving the right brake block 16 to move to the left. The right brake block 16 contacts and presses the brake disc 35, completing the backup braking of the brake disc 35 of the wheel.

[0073] The above embodiments are only used to illustrate the design ideas and features of the present invention, and their purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. The protection scope of the present invention is not limited to the above embodiments. Therefore, any equivalent changes or modifications made based on the principles and design ideas disclosed by the present invention are within the protection scope of the present invention.

Claims

1. A vehicle hydraulic brake device with mechanical backup brake, characterized in that: include: Hydraulic brake unit and mechanical backup brake unit; The hydraulic brake unit comprises a brake housing (5), a hydraulic oil circuit control unit, and a brake unit; a brake piston cylinder (31) is provided inside the brake housing (5); the brake unit comprises a brake piston (23) and a brake block; the brake piston (23) is movably mounted in the brake piston cylinder (31), and a hydraulic chamber is formed between one end of the brake piston (23) and the brake piston cylinder (31); the brake block is movably mounted at the other end of the brake piston (23); the hydraulic oil circuit comprises a valve core hole (30), a valve core (9), and a valve core electromagnet A push rod, an oil inlet (10), an oil return port (12), a brake main oil channel (11), and an energy storage oil channel (8); the oil inlet (10), the oil return port (12), and the brake main oil channel (11) are all connected to a valve core hole (30); the valve core solenoid push rod is provided with two ends of the valve core hole (30), and the valve core (9) is movably installed in the valve core hole (30), and the valve core solenoid push rod changes the position of the valve core (9) in the valve core hole (30) to control the opening or closing of the oil return port (12), the brake main oil channel (11), and the energy storage oil channel 8; The mechanical backup brake unit comprises a backup brake housing (1), an energy storage spring (2), a backup brake piston rod (3) and a unloading unit; the backup brake housing (1) is fixedly connected to the brake housing (5), and a cylinder (28) is provided inside the backup brake housing (1); the piston portion of the backup brake piston rod (3) contacts the inner wall of the cylinder (28) through the energy storage spring (2), an energy storage hydraulic chamber is formed between the rod portion of the backup brake piston rod (3) and the brake housing (5), and the energy storage hydraulic chamber is connected to an energy storage oil channel (8); the energy storage hydraulic chamber is connected to the unloading unit, and the hydraulic oil in the energy storage hydraulic chamber is discharged through the unloading unit; the rod portion of the backup brake piston rod (3) is movably connected to the brake housing (5).

2. A vehicle hydraulic brake device with mechanical backup brake according to claim 1, characterized in that: Both ends of the valve core (9) are shaft shoulders (24) structures, and the two shaft shoulders (24) are connected by a valve core shaft (25); During the movement of the valve core (9), when the shaft shoulder (24) moves to the hole position of the oil inlet (10), the oil return port (12), the brake main oil channel (11) or the energy storage oil channel (8), the hole position will be closed; when the shaft shoulder (24) leaves the hole position, the hole position will restore the passage.

3. A vehicle hydraulic brake device with mechanical backup brake according to claim 1, characterized in that: A left return spring (7) and a right return spring (13) are respectively arranged on the left and right sides of the valve core (9); one end of the left return spring (7) and the right return spring (13) are respectively in contact with the end surface of the valve core hole (30), and the other end is in contact with the end surfaces of both sides of the valve core (9).

4. A vehicle hydraulic brake device with mechanical backup brake according to claim 1, characterized in that: The unloading unit comprises an unloading valve core hole (29), an unloading valve core (20), and an unloading electromagnetic push rod (18). The unloading valve core hole (29) is provided with an unloading oil passage II (19) and an unloading oil passage I (17). The unloading oil passage I (17) is connected to the energy storage hydraulic chamber. An unloading electromagnetic push rod (18) is arranged on the opening side of the unloading valve core hole (29). The unloading valve core (20) is movably installed in the unloading valve core hole (29). One side of the unloading valve core (20) is connected to the unloading electromagnetic push rod (18). The unloading valve core (20) is driven to reciprocate in the unloading valve core hole (29) by the unloading electromagnetic push rod (18), so as to change the position of the unloading valve core (20) in the unloading valve core hole (29), and adjust the closing or conduction of the unloading oil passage I (17) and the unloading oil passage II (19).

5. A vehicle hydraulic brake device with mechanical backup brake according to claim 4, characterized in that: An unloading valve return spring (21), an unloading valve core (20) and an unloading electromagnet push rod (18) are arranged in sequence from the closed end to the open end in the unloading valve core hole (29), and the three are in contact with each other.

6. A vehicle hydraulic brake device with mechanical backup brake according to claim 1, characterized in that: A groove is arranged on the inner wall of the through hole (37) on the brake housing (5) along the circumferential direction, and a sealing ring (22) is installed in the groove.

7. A vehicle hydraulic brake device with mechanical backup brake according to claim 1, characterized in that: A groove is provided on the side wall of the piston portion of the brake piston rod (3), and a sealing ring (4) is installed in the groove.

8. A vehicle, characterized in that: The vehicle's braking system adopts the vehicle hydraulic braking device with mechanical backup braking as described in claim 1.

9. A vehicle according to claim 8, characterized in that: The oil inlet (10) is connected to the high-pressure oil circuit (34) of the vehicle hydraulic system, the oil return port (12) is connected to the hydraulic oil tank, and the unloading oil passage II (19) of the unloading unit is connected to the vehicle hydraulic system oil tank.

10. A vehicle according to claim 1, characterized in that: The electromagnet push rods in the vehicle hydraulic brake device are all connected to the controller (39) by signal, and the controller (39) regulates the working state of the electromagnet push rods according to the vehicle state.

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