Parking brake valve group, brake system with parking brake valve group and vehicle with parking brake valve group

Abstract

The utility model provides a parking brake valve group, a brake system with the parking brake valve group and a vehicle with the parking brake valve group. The parking brake valve group is provided with a pressure oil interface, a rear axle brake interface, a middle axle brake interface and an oil return interface, the rear axle brake interface is communicated with the rear axle parking brake, the middle axle brake interface is communicated with the middle axle parking brake, the pressure oil interface is communicated with the oil supply device, and the oil return interface is communicated with the oil storage device; when the parking brake valve group is in a first working mode, the pressure oil interface is communicated with one of the rear axle brake interface and the middle axle brake interface, so that pressure oil of the oil supply device enters one of the rear axle parking brake and the middle axle parking brake through the parking brake valve group; and the other one of the rear axle braking interface and the middle axle braking interface is communicated with the oil return interface, so that hydraulic oil of the other one of the rear axle parking brake and the middle axle parking brake is returned to the oil storage device through the parking brake valve group. According to the scheme, the problem that the service life is affected by parking abrasion of a vehicle in the prior art is solved.

Description

Technical Field

[0001] This utility model relates to the field of vehicle technology, and more specifically, to a parking brake valve assembly and a braking system and vehicle having the same. Background Technology

[0002] In the current mining truck industry, the difference between empty and fully loaded mining trucks is significant. When the vehicle load changes, the vehicle body posture will change. When all parking brakes are engaged at the same time, the change in vehicle body posture will cause relative movement between the wheels and the ground. This will lead to wear on the parking friction pads and brake discs, and additional internal forces between the suspension guide mechanism and the frame, resulting in greater vehicle wear and reduced vehicle lifespan.

[0003] There is currently no effective solution to the above problems. Utility Model Content

[0004] The main objective of this invention is to provide a parking brake valve assembly and a braking system and vehicle having the same assembly, in order to solve the problem in the prior art where vehicle parking wear affects the service life of the vehicle.

[0005] To achieve the above objectives, according to one aspect of the present invention, a parking brake valve assembly is provided. The parking brake valve assembly has a pressure oil port, a rear axle brake port, a middle axle brake port, and a return oil port. The rear axle brake port is connected to the rear axle parking brake, the middle axle brake port is connected to the middle axle parking brake, the pressure oil port is connected to the oil supply device, and the return oil port is connected to the oil storage device. The parking brake valve assembly has a first operating mode. When the parking brake valve assembly is in the first operating mode, the pressure oil port is connected to one of the rear axle brake port and the middle axle brake port, so that the pressure oil from the oil supply device enters one of the rear axle parking brake and the middle axle parking brake through the parking brake valve assembly. The other of the rear axle brake port and the middle axle brake port is connected to the return oil port, so that the hydraulic oil of the other of the rear axle parking brake and the middle axle parking brake returns to the oil storage device through the parking brake valve assembly.

[0006] Furthermore, the parking brake valve assembly also has a second working mode. When the parking brake valve assembly is in the second working mode, the rear axle brake interface and the middle axle brake interface are connected to the return oil interface so that the hydraulic oil of the rear axle parking brake and the middle axle parking brake can return to the oil storage device through the parking brake valve assembly.

[0007] Furthermore, the parking brake valve assembly also has a third working mode. When the parking brake valve assembly is in the third working mode, the rear axle brake interface and the middle axle brake interface are connected to the pressure oil interface, so that the pressure oil from the oil supply device enters the rear axle parking brake and the middle axle parking brake respectively through the parking brake valve assembly.

[0008] Furthermore, the parking brake valve assembly includes: a first solenoid valve, the first port of which is connected to the oil supply device, the second port of which is connected to the rear axle parking brake, and the first return port of which is connected to the oil reservoir; a second solenoid valve, the third port of which is connected to the oil supply device, the fourth port of which is connected to the middle axle parking brake, and the second return port of which is connected to the oil reservoir; wherein the first solenoid valve has a first connected state connecting the first port and the second port, and a first return state connecting the first return port and the second port; the second solenoid valve has a second connected state connecting the third port and the fourth port, and a second return state connecting the fourth port and the fourth port.

[0009] Furthermore, the parking brake valve assembly also includes: a third solenoid valve, the fifth port of which is connected to the oil supply device, the sixth port of which is connected to the first port of the first solenoid valve and the third port of the second solenoid valve respectively, and the third return port of which is connected to the oil reservoir; the third solenoid valve has a third connected state in which the fifth port is connected to the sixth port, and a third return state in which the third return port is connected to the sixth port.

[0010] Furthermore, the first and second solenoid valves are both two-position, three-position normally closed solenoid valves, and the third solenoid valve is a two-position, three-position normally open solenoid valve.

[0011] Furthermore, the parking brake valve assembly also includes: a fourth solenoid valve, the seventh port of which is connected to the oil supply device, the eighth port of which is connected to the first port of the first solenoid valve, and the fourth return port of which is connected to the oil reservoir; and a fifth solenoid valve, the ninth port of which is connected to the oil supply device, the tenth port of which is connected to the third port of the second solenoid valve, and the fifth return port of which is connected to the oil reservoir; wherein the fourth solenoid valve has a fourth connected state connecting the seventh port and the eighth port, and a fourth return state connecting the fourth return port and the eighth port; the fifth solenoid valve has a fifth connected state connecting the ninth port and the tenth port, and a fifth return state connecting the fifth return port and the tenth port.

[0012] Furthermore, the first and second solenoid valves are both two-position, three-normally closed solenoid valves, and / or the fourth and fifth solenoid valves are both two-position, three-normally open solenoid valves.

[0013] To achieve the above objectives, according to one aspect of the present invention, a braking system is provided, the braking system including the above-mentioned parking brake valve assembly.

[0014] According to another aspect of the present invention, a vehicle is provided, the vehicle including at least one of a parking brake valve assembly and a braking system, wherein the parking brake valve assembly is the aforementioned parking brake valve assembly, and the braking system is the aforementioned braking system.

[0015] Furthermore, the first working mode corresponds to the vehicle's unloading or loading status.

[0016] By applying the technical solution of this utility model, hydraulic oil can control the parking brake of the middle axle and the parking brake of the rear axle through the rear axle brake interface and the middle axle brake interface of the parking brake valve group, thereby realizing automatic braking control in the autonomous driving mode. On this basis, the parking brake valve group has a first working mode, that is, by adjusting the internal connection relationship of the parking brake valve group, the pressurized oil is input only to one of the middle axle parking brake and the rear axle parking brake, while the other of the middle axle parking brake and the rear axle parking brake is connected to the oil reservoir to achieve parking. That is, at this time, one of the middle axle parking brake and the rear axle parking brake of the vehicle is engaged in parking braking, while the other is released. This allows the vehicle to still have a certain degree of freedom when parked, which can adapt to the relative sliding between the wheels and the ground when the vehicle load changes. It allows the wheels to adjust their posture according to the load change, avoids unnecessary friction and mechanical stress, and extends the service life of the vehicle. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0018] Figure 1 A schematic diagram of the structure of a first embodiment of the parking brake valve assembly according to the present invention is shown;

[0019] Figure 2 A schematic diagram of the control logic of the parking brake valve assembly according to the present invention is shown.

[0020] The above figures include the following reference numerals:

[0021] 10. Parking brake valve assembly; 11. First solenoid valve; 12. Second solenoid valve; 13. Third solenoid valve;

[0022] 20. Rear axle parking brake;

[0023] 30. Parking brake for the middle axle;

[0024] 40. Oil supply device; 41. Accumulator; 42. Dual-way filling valve; 43. Check valve;

[0025] 50. Oil storage device;

[0026] 60. Pressure sensing element. Detailed Implementation

[0027] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0028] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0029] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0030] Exemplary embodiments according to this application will now be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments may be implemented in many different forms and should not be construed as being limited to the embodiments set forth herein. It should be understood that these embodiments are provided so that the disclosure of this application is thorough and complete, and that the concept of these exemplary embodiments is fully conveyed to those skilled in the art. In the drawings, for clarity, the thickness of layers and regions may be exaggerated, and the same reference numerals are used to denote the same devices, and therefore their description will be omitted.

[0031] Combination Figures 1 to 2 As shown, according to a specific embodiment of this application, a parking brake valve assembly is provided.

[0032] Specifically, such as Figure 1As shown, the parking brake valve assembly 10 has a pressure oil port, a rear axle brake port, a middle axle brake port, and a return oil port. The rear axle brake port is connected to the rear axle parking brake 20, the middle axle brake port is connected to the middle axle parking brake 30, the pressure oil port is connected to the oil supply device 40, and the return oil port is connected to the oil storage device 50. The parking brake valve assembly 10 has a first working mode. When the parking brake valve assembly 10 is in the first working mode, the pressure oil port is connected to one of the rear axle brake port and the middle axle brake port, so that the pressure oil from the oil supply device 40 enters one of the rear axle parking brake 20 and the middle axle parking brake 30 through the parking brake valve assembly 10. The other of the rear axle brake port and the middle axle brake port is connected to the return oil port, so that the hydraulic oil of the other of the rear axle parking brake 20 and the middle axle parking brake 30 returns to the oil storage device 50 through the parking brake valve assembly 10.

[0033] Applying the technical solution of this embodiment, hydraulic oil can control the middle axle parking brake 30 and the rear axle parking brake 20 respectively through the rear axle brake interface and the middle axle brake interface of the parking brake valve assembly 10, thereby realizing automatic braking control in the automatic driving mode. On this basis, the parking brake valve assembly 10 also has a first working mode, that is, by adjusting the internal connection relationship, the parking brake valve assembly 10 can input the pressure oil only into one of the middle axle parking brake 30 and the rear axle parking brake 20, while the other of the middle axle parking brake 30 and the rear axle parking brake 20 is connected to the oil reservoir 50 to achieve parking. That is, at this time, one of the middle axle parking brake 30 and the rear axle parking brake 20 of the vehicle is engaged in parking braking, while the other is released. This allows the vehicle to still have a certain degree of freedom when parked, which can adapt to the relative sliding between the wheels and the ground when the vehicle load changes. It allows the wheels to adjust their posture according to the load change, avoids unnecessary friction and mechanical stress, and extends the service life of the vehicle.

[0034] It should be noted that in the embodiments of this application, in the first working mode, either the rear axle parking brake 20 or the middle axle parking brake 30 is kept in parking position while the other is released. The brake used for parking in the first working mode can be adjusted according to actual needs. That is, the state of each brake in the first working mode can be fixed in advance, or the state of the brake can be changed according to the actual scenario during use, so as to make the vehicle more stable when loading and parking.

[0035] Preferably, when the parking brake valve assembly 10 is in the first working mode, the pressure oil interface is connected to the middle axle brake interface, so that the pressure oil of the oil supply device 40 enters the middle axle parking brake 30 through the parking brake valve assembly 10 to realize the middle axle release parking. The rear axle brake interface is connected to the return oil interface, so that the hydraulic oil of the rear axle parking brake 20 returns to the oil storage device 50 through the parking brake valve assembly 10 to realize the rear axle parking.

[0036] In practical applications, when the vehicle load changes (such as during loading and unloading), the rear axle remains stationary, while the middle axle releases its stationary position to have a certain degree of freedom. This allows the rear axle, which is closer to the loading / unloading position, to maintain a stable position, ensuring the normal operation of the loading / unloading process. Meanwhile, the middle axle, which is farther from the loading / unloading position, can sway due to its degree of freedom, adapting to changes in the vehicle's posture during the loading / unloading process. This effectively avoids vehicle damage caused by friction between the wheels and the ground, as well as friction between vehicle components, and extends the vehicle's service life.

[0037] Specifically, the parking brake valve assembly 10 also has a second operating mode. In this mode, both the rear axle brake interface and the middle axle brake interface are connected to the return oil interface, ensuring that the hydraulic oil from the rear axle parking brake 20 and the middle axle parking brake 30 returns to the oil reservoir 50 via the parking brake valve assembly 10. When the vehicle needs to be parked for an extended period, whether unloaded or fully loaded, the parking brake valve assembly 10 can switch to the second operating mode to ensure that the rear axle parking brake 20 and the middle axle parking brake 30 are both active, providing stable braking force and preventing vehicle slippage. The vehicle controller, by controlling the proportional valves in the parking brake valve assembly 10, distributes high-pressure hydraulic oil to the rear axle parking brake 20 and the middle axle parking brake 30 according to preset values ​​in the second operating mode, forming an effective braking torque. This allows the vehicle to be safely and stably parked under any load conditions, greatly enhancing the vehicle's adaptability in complex environments.

[0038] It should be noted that when the parking brake valve assembly 10 needs to switch to the second working mode or needs to maintain the second working mode, it is necessary to control the hydraulic oil of the rear axle parking brake 20 and the middle axle parking brake 30 to be discharged back to the oil reservoir 50, so that pressure is formed in the brake, thereby realizing the parking brake of the rear axle parking brake 20 and the middle axle parking brake 30.

[0039] Furthermore, the parking brake valve assembly 10 also has a third operating mode. When the parking brake valve assembly 10 is in the third operating mode, the rear axle brake interface and the middle axle brake interface are both connected to the pressure oil interface, so that the pressure oil from the oil supply device 40 enters the rear axle parking brake 20 and the middle axle parking brake 30 respectively through the parking brake valve assembly 10. When the vehicle is about to start from a stationary state, the third operating mode can quickly release the brake. Under the control of the parking brake valve assembly 10, high-pressure hydraulic oil is quickly released to the brake through the pressure oil interface, so that the hydraulic oil pressure in the brake is released, thus releasing the brake and realizing the release of parking.

[0040] In one embodiment of this application, such as Figure 1As shown, a one-way valve 43 is provided on the connecting pipeline between the parking brake valve assembly 10 and the oil supply device 40. The permissible flow direction of the one-way valve 43 is from the dual-way filling valve 42 to the parking brake valve assembly 10. During the parking brake valve assembly 10 releases the parking brake, the one-way valve 43 can prevent the hydraulic oil from flowing back, ensuring the safety of the entire parking brake and the parking brake release process.

[0041] Furthermore, the parking brake valve assembly 10 includes a first solenoid valve 11 and a second solenoid valve 12. The first port of the first solenoid valve 11 is connected to the oil supply device 40, the second port of the first solenoid valve 11 is connected to the rear axle parking brake 20, and the first return port of the first solenoid valve 11 is connected to the oil reservoir 50. The third port of the second solenoid valve 12 is connected to the oil supply device 40, the fourth port of the second solenoid valve 12 is connected to the middle axle parking brake 30, and the second return port of the second solenoid valve 12 is connected to the oil reservoir 50. The first solenoid valve 11 has a first connected state that connects the first port to the second port, and a first return state that connects the first return port to the second port. The second solenoid valve 12 has a second connected state that connects the third port to the fourth port, and a second return state that connects the fourth port to the fourth port. When the first solenoid valve 11 is energized and in the first connected state, the first interface is connected to the second interface, allowing the high-pressure hydraulic oil in the oil supply device 40 to flow directly to the rear axle parking brake 20, pushing the brake piston, releasing the parking brake, and allowing the rear axle to rotate freely. When the first solenoid valve 11 is de-energized, it is in the first return state, with the first return interface connected to the second interface. This state allows the hydraulic oil in the rear axle parking brake 20 to flow back to the oil reservoir 50, thereby releasing the hydraulic pressure to achieve parking braking. When the second solenoid valve 12 is energized and in the second connected state, the third interface is connected to the fourth interface, ensuring that the high-pressure hydraulic oil in the oil supply device 40 can be delivered to the middle axle parking brake 30, similarly releasing the parking brake and allowing the middle axle wheels to rotate freely. When the second solenoid valve 12 is de-energized and in the second return state, the fourth interface is connected to the second return interface, allowing the hydraulic oil in the middle axle parking brake 30 to flow back to the oil reservoir 50, releasing the middle axle brake and completing the parking brake.

[0042] It should be noted that the switching between the states of the first solenoid valve 11 and the second solenoid valve 12 is controlled by the VCU (Vehicle Control Unit) according to the real-time needs of the vehicle. When releasing the parking brake, the VCU ensures that the first solenoid valve 11 and the second solenoid valve 12 are in an energized and connected state, allowing high-pressure hydraulic oil to flow to the rear axle parking brake 20 and the middle axle parking brake 30, thus releasing the braking state. When applying the parking brake, the VCU controls the solenoid valves to de-energize and enter the return oil mode, allowing the hydraulic oil in the brakes to flow back to the oil reservoir 50, thereby applying the parking brake on the rear axle and the middle axle. Through the VCU, parking and releasing operations can be performed accurately and safely, greatly enhancing vehicle safety and operational efficiency.

[0043] Specifically, such as Figure 1 As shown, the parking brake valve assembly 10 also includes a third solenoid valve 13. The fifth port of the third solenoid valve 13 is connected to the oil supply device 40, and the sixth port of the third solenoid valve 13 is connected to the first port of the first solenoid valve 11 and the third port of the second solenoid valve 12, respectively. The third return port of the third solenoid valve 13 is connected to the oil reservoir 50. The third solenoid valve 13 has a third connected state where the fifth port is connected to the sixth port, and a third return state where the third return port is connected to the sixth port. As the main control valve of the parking brake valve assembly 10, the third solenoid valve 13 can coordinate the operation of the first solenoid valve 11 and the second solenoid valve 12, ensuring efficient distribution and recovery of hydraulic oil, realizing overall control of the braking system, improving the system integration and reliability, simplifying the control logic, and reducing the failure rate. When the third solenoid valve 13 is energized and in the third connected state, the fifth port is connected to the sixth port. At this time, the high-pressure hydraulic oil in the oil supply device 40 can directly reach the first solenoid valve 11 and the second solenoid valve 12 through the third solenoid valve 13. Then, according to the current state (energized or de-energized) of the first solenoid valve 11 and the second solenoid valve 12, the hydraulic oil will be further distributed to the rear axle parking brake 20 and the middle axle parking brake 30 to realize the function of releasing the parking brake. When the third solenoid valve 13 is de-energized and in the third return oil state, the third return oil port is connected to the sixth port, allowing the hydraulic oil from the first solenoid valve 11 and the second solenoid valve 12 (i.e., the oil from the rear axle and the middle axle parking brakes) to flow back to the oil reservoir 50 through the third solenoid valve 13 for the purpose of implementing the parking brake. That is, the brake pistons of the rear axle and the middle axle are forced to reset by the recovery of hydraulic oil to realize the parking of the vehicle. With the precise control of the third solenoid valve 13, the entire parking brake system can efficiently perform the operations of releasing the parking brake and applying the parking brake in an unmanned driving environment, ensuring the safety and reliability of the mining truck under various working conditions.

[0044] Optionally, the first solenoid valve 11 and the second solenoid valve 12 are both two-position, three-position normally closed solenoid valves, and the third solenoid valve 13 is a two-position, three-position normally open solenoid valve. The normally open solenoid valve connects to the oil circuit when power is off, and the normally closed solenoid valve disconnects the oil circuit when power is off. This configuration ensures that the brake remains locked in the event of a power supply failure, improving system safety. It should be understood that the first solenoid valve 11, the second solenoid valve 12, and the third solenoid valve 13 can also be replaced with other solenoid valve structures, as long as they have the aforementioned interfaces and connection states.

[0045] Furthermore, the parking brake valve assembly 10 also includes a fourth solenoid valve and a fifth solenoid valve. The seventh port of the fourth solenoid valve is connected to the oil supply device 40, the eighth port of the fourth solenoid valve is connected to the first port of the first solenoid valve 11, and the fourth return port of the fourth solenoid valve is connected to the oil reservoir 50. The ninth port of the fifth solenoid valve is connected to the oil supply device 40, the tenth port of the fifth solenoid valve is connected to the third port of the second solenoid valve 12, and the fifth return port of the fifth solenoid valve is connected to the oil reservoir 50. The fourth solenoid valve has a fourth connection state where the seventh port is connected to the eighth port, and a fourth return state where the fourth return port is connected to the eighth port. The fifth solenoid valve has a fifth connection state where the ninth port is connected to the tenth port, and a fifth return state where the fifth return port is connected to the tenth port. When the fourth solenoid valve is energized and in the fourth connected state, the seventh and eighth ports are connected, allowing high-pressure hydraulic oil to flow directly to the first solenoid valve 11. When the fourth solenoid valve is de-energized and in the fourth return state, the fourth return port is connected to the eighth port, allowing hydraulic oil in the rear axle parking brake 20 to flow back to the oil reservoir 50 via the first solenoid valve 11. When the fifth solenoid valve is energized and in the fifth connected state, the ninth and tenth ports are connected, allowing high-pressure hydraulic oil to flow to the second solenoid valve 12. When the fifth solenoid valve is de-energized and in the fifth return state, the fifth return port is connected to the tenth port, allowing hydraulic oil in the middle axle parking brake 30 to flow back to the oil reservoir 50 via the second solenoid valve 12.

[0046] It should be noted that when the parking brake is released, both the fourth and fifth solenoid valves are energized, entering the fourth and fifth connected states respectively, allowing high-pressure hydraulic oil to flow directly to the first solenoid valve 11 and the second solenoid valve 12, thereby releasing the parking brakes of the rear axle and the middle axle respectively; when the parking brake is applied, the fourth and fifth solenoid valves are de-energized, entering the fourth and fifth return states respectively. At this time, the hydraulic oil in the rear axle parking brake 20 and the middle axle parking brake 30 will flow back to the oil reservoir 50 through the first and second solenoid valves to perform the parking brake. Furthermore, during loading braking, the fourth solenoid valve remains energized while the fifth solenoid valve is de-energized. This releases the rear axle parking brake 20 (via the first solenoid valve 11), while the middle axle parking brake 30 remains braked (via the second solenoid valve 12), adapting to the special needs of the vehicle during loading or unloading. In emergency situations, if either the fourth or fifth solenoid valve malfunctions, the corresponding first solenoid valve 11 or second solenoid valve 12 can be energized to ensure normal oil return or distribution, thereby ensuring the vehicle can be safely parked.

[0047] Optionally, the first solenoid valve 11 and the second solenoid valve 12 are both two-position, three-position normally closed solenoid valves, and the fourth solenoid valve and the fifth solenoid valve are both two-position, three-position normally open solenoid valves. It should be understood that the first solenoid valve 11, the second solenoid valve 12, the fourth solenoid valve, and the fifth solenoid valve can also be replaced with other solenoid valve structures, as long as they have the above-mentioned interfaces and on / off states.

[0048] In one embodiment of this application, the parking brake valve assembly 10 further includes a plurality of pressure sensing elements 60. At least one pressure sensing element 60 is used to detect the oil pressure in the connecting line between the first solenoid valve 11 and the rear axle parking brake 20, and at least one pressure sensing element 60 is used to detect the oil pressure in the connecting line between the second solenoid valve 12 and the middle axle parking brake 30. By setting the pressure sensing elements 60 in the aforementioned positions of the parking brake valve assembly 10, the oil pressure in the lines can be continuously detected to ensure that the hydraulic system can provide sufficient pressure to drive the brake piston when the parking brake is released or applied. At the same time, during the parking brake process, the pressure sensing elements 60 can also monitor whether the brake response time and braking pressure reach preset values ​​to verify whether the braking effect meets safety standards.

[0049] According to another specific embodiment of this application, a braking system is provided, which includes the parking brake valve assembly in the above embodiments.

[0050] Furthermore, the braking system also includes an oil supply device 40, which includes an accumulator 41 and a dual-way filling valve 42. The accumulator 41 and the dual-way filling valve 42 are respectively connected to the pressure oil interface of the parking brake valve assembly 10. A one-way valve 43 is installed on the connecting pipeline between the dual-way filling valve 42 and the parking brake valve assembly 10. The permissible flow direction of the one-way valve 43 is from the dual-way filling valve 42 to the parking brake valve assembly 10. The accumulator 41 plays the role of energy storage and pressure buffering in the hydraulic system. It can quickly provide high-pressure hydraulic oil when the system needs it. Especially in the case of rapid response to braking demand, the accumulator 41 can compensate for the insufficient instantaneous oil supply capacity of the oil pump. The high-pressure oil in the accumulator can quickly flow to the parking brake valve assembly 10 through the pressure oil interface to drive the first solenoid valve 11 and the second solenoid valve 12, thereby controlling the braking or release of the rear axle parking brake 20 and the middle axle parking brake 30. Through the coordinated operation of the above components, the oil supply device 40 can ensure that the parking brake system has a stable and sufficient hydraulic oil source under various working conditions.

[0051] According to another specific embodiment of this application, a vehicle is also provided, comprising at least one of a parking brake valve assembly and a braking system. The parking brake valve assembly is the same as that in the above embodiments, and the braking system is the same as that in the above embodiments. By combining the parking brake valve assembly and braking system from the above embodiments with the overall vehicle architecture, a comprehensive improvement in vehicle braking performance is achieved, ensuring safety and reliability for the vehicle in both parked and loaded states, enabling it to cope with various emergencies and ensure operational safety. Preferably, the vehicle is a 6×4 mining truck.

[0052] Furthermore, the first working mode corresponds to the vehicle's unloading or loading state. When the vehicle is in the loading or unloading state, the parking brake valve group is in the first working mode. At this time, one of the vehicle's middle axle parking brake 30 and rear axle parking brake 20 applies the parking brake, while the other releases the brake to accommodate the relative slippage between the wheels and the ground during loading, releasing the vehicle's degrees of freedom and allowing the wheels to adjust their posture according to load changes, thus facilitating the loading and unloading of goods.

[0053] This application also provides a preferred embodiment of a parking brake valve assembly. Figure 1 The structure of the parking brake valve assembly is shown. Figure 2 The diagram shows the energization and de-energization of each valve under different braking conditions. In this embodiment, the parking brake valve group is equipped with loading brake and emergency braking schemes in addition to parking brake.

[0054] Specifically, the parking brake valve assembly includes an oil supply device 40, an oil storage device 50, and a parking brake valve assembly 10. The oil supply device 40 includes a hydraulic oil tank for storing hydraulic oil; an oil suction filter for filtering the hydraulic oil before the pump; a pump body for converting low-pressure hydraulic oil into high-pressure hydraulic oil; an accumulator 41, which starts filling when the hydraulic oil pressure in the accumulator is lower than a set value and stops filling when the hydraulic oil pressure in the accumulator is higher than the set value. The accumulator 41 is used to store high-pressure hydraulic oil; and a dual-way filling valve 42 for filling the accumulator 41 with hydraulic oil. When the pressure in the accumulator 41 is lower than the set value, the motor drives the pump body to start working, storing hydraulic oil in the accumulator 41 through the dual-way filling valve 42. At the same time, as the pump body continues to work, the hydraulic oil pressure in the accumulator 41 continuously increases. When it exceeds the set value, the motor and pump body stop working, and the filling stops.

[0055] The parking brake valve assembly 10 includes a first solenoid valve 11, a second solenoid valve 12, and a third solenoid valve 13. Figure 2 In this context, the parking valve assembly refers to the aforementioned parking brake valve assembly. Y1 is the third solenoid valve 13, Y2 is the first solenoid valve 11, and Y3 is the second solenoid valve 12. When parking brake is required, the VCU controls all solenoid valves in the parking brake valve assembly 10 to be de-energized. The hydraulic oil in the middle axle parking brake 30 and the rear axle parking brake 20 flows back to the oil reservoir 50 through the second solenoid valve 12, the first solenoid valve 11, and then through the third solenoid valve 13. When parking brake release is required, the VCU controls the third solenoid valve 13 to be energized. The pressurized oil flows from the accumulator 41 through the third solenoid valve 13, then through the second solenoid valve 12 and the first solenoid valve 11 to the middle axle parking brake 30 and the rear axle parking brake 20, respectively, thus realizing the parking brake release function for the middle and rear axles.

[0056] When loading braking is required, the VCU controls the first solenoid valve 11 and the third solenoid valve 13 to be energized. The pressurized oil flows from the accumulator 41 through the third solenoid valve 13 and then through the second solenoid valve 12 to the middle axle parking brake 30. The middle axle parking brake 30 is released. Since the first solenoid valve 11 is energized, the hydraulic oil in the rear axle parking brake 20 is drained back to the oil storage device 50 through the first solenoid valve 11, and the rear axle parking brake 20 is engaged, thus realizing the loading braking function.

[0057] When emergency parking is required, if the third solenoid valve 13 malfunctions, the VCU controls the second solenoid valve 12 and the first solenoid valve 11 to be energized, causing the hydraulic oil in the middle axle parking brake 30 and the rear axle parking brake 20 to drain back into the oil reservoir 50, ensuring vehicle safety.

[0058] For example, in the existing vehicle loading / unloading process, the empty and fully loaded weight of mining trucks differs greatly. During loading and unloading, the change in load will cause changes in the vehicle body posture. When parking brake is used during loading or unloading, the middle and rear axles are parked at the same time. Due to the change in vehicle body posture, relative movement will occur between the wheels and the ground. This will cause wear on the parking friction pads and brake discs, and additional internal forces will be borne between the suspension guide mechanism and the frame, resulting in severe vehicle wear.

[0059] The following technical effects can be achieved by using the vehicle in the above embodiments for loading / unloading: the parking brake valve group has a parking brake scheme in the unmanned driving mode, and also has a parking brake scheme when loading brake. While ensuring the safety of the unmanned vehicle, it releases the degree of freedom of the whole vehicle, which is convenient for loading and unloading goods; pressure detection elements 60 are set at key positions of the hydraulic system oil circuit to detect the pressure at various points at any time, and monitor and analyze the working status and fault conditions of the system.

[0060] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0061] In addition to the above, it should be noted that the terms "one embodiment," "another embodiment," and "embodiment" used in this specification refer to specific features, structures, or characteristics described in connection with that embodiment, which are included in at least one embodiment described in the general description of this application. The appearance of the same expression in multiple places in the specification does not necessarily refer to the same embodiment. Furthermore, when a specific feature, structure, or characteristic is described in connection with any embodiment, the intention is to suggest that implementing such a feature, structure, or characteristic in conjunction with other embodiments also falls within the scope of this utility model.

[0062] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0063] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A parking brake valve group, characterized in that, The parking brake valve assembly has a pressure oil port, a rear axle brake port, a middle axle brake port and a return oil port, wherein the rear axle brake port is connected to the rear axle parking brake (20), the middle axle brake port is connected to the middle axle parking brake (30), the pressure oil port is connected to the oil supply device (40), and the return oil port is connected to the oil storage device (50). The parking brake valve assembly has a first working mode. When the parking brake valve assembly is in the first working mode, the pressure oil port is connected to one of the rear axle brake port and the middle axle brake port, so that the pressure oil of the oil supply device (40) enters one of the rear axle parking brake (20) and the middle axle parking brake (30) through the parking brake valve assembly. The other of the rear axle brake port and the middle axle brake port is connected to the return oil port, so that the hydraulic oil of the other of the rear axle parking brake (20) and the middle axle parking brake (30) returns to the oil storage device (50) through the parking brake valve assembly.

2. The parking brake valve assembly according to claim 1, characterized in that, The parking brake valve group also has a second working mode. When the parking brake valve group is in the second working mode, the rear axle brake interface and the middle axle brake interface are connected to the return oil interface so that the hydraulic oil of the rear axle parking brake (20) and the middle axle parking brake (30) are returned to the oil storage device (50) through the parking brake valve group.

3. The parking brake valve group of claim 1, wherein, The parking brake valve group also has a third working mode. When the parking brake valve group is in the third working mode, the rear axle brake interface and the middle axle brake interface are connected to the pressure oil interface so that the pressure oil of the oil supply device (40) enters the rear axle parking brake (20) and the middle axle parking brake (30) respectively through the parking brake valve group.

4. The parking brake valve group according to any one of claims 1 - 3, characterized in that The parking brake valve assembly includes: The first solenoid valve (11) has a first port connected to the oil supply device (40), a second port connected to the rear axle parking brake (20), and a first return port connected to the oil storage device (50). The second solenoid valve (12) has a third port connected to the oil supply device (40), a fourth port connected to the middle bridge parking brake (30), and a second return port connected to the oil storage device (50). The first solenoid valve (11) has a first connected state that connects the first interface to the second interface, and a first return state that connects the first return oil interface to the second interface; the second solenoid valve (12) has a second connected state that connects the third interface to the fourth interface, and a second return state that connects the fourth interface to the fourth interface.

5. The parking brake valve group of claim 4, wherein, The parking brake valve assembly also includes: The third solenoid valve (13) has its fifth port connected to the oil supply device (40), its sixth port connected to the first port of the first solenoid valve (11) and the third port of the second solenoid valve (12), and its third return port connected to the oil storage device (50). The third solenoid valve (13) has a third connection state that connects the fifth interface to the sixth interface, and a third return state that connects the third return oil interface to the sixth interface.

6. The parking brake valve group of claim 5, wherein, The first solenoid valve (11), the second solenoid valve (12), and / or the third solenoid valve (13) are two-position three-way normally open solenoid valves.

7. The parking brake valve group of claim 4, wherein, The parking brake valve assembly also includes: The fourth solenoid valve has its seventh port connected to the oil supply device (40), its eighth port connected to the first port of the first solenoid valve (11), and its fourth return port connected to the oil storage device (50). The fifth solenoid valve has its ninth port connected to the oil supply device (40), its tenth port connected to the third port of the second solenoid valve (12), and its fifth return port connected to the oil storage device (50). The fourth solenoid valve has a fourth connection state that connects the seventh interface to the eighth interface, and a fourth return state that connects the fourth return oil interface to the eighth interface; the fifth solenoid valve has a fifth connection state that connects the ninth interface to the tenth interface, and a fifth return state that connects the fifth return oil interface to the tenth interface.

8. The parking brake valve group of claim 7, wherein, The first solenoid valve (11) and the second solenoid valve (12) are both two-position three-normally closed solenoid valves; and / or, the fourth solenoid valve and the fifth solenoid valve are both two-position three-normally open solenoid valves.

9. A brake system characterized by, The braking system includes the parking brake valve assembly as described in any one of claims 1-8.

10. A vehicle, characterized in that, The vehicle includes at least one of a parking brake valve assembly and a braking system, wherein the parking brake valve assembly includes the parking brake valve assembly according to any one of claims 1-8, and the braking system includes the braking system according to claim 9.

11. The vehicle of claim 10, wherein, The first working mode corresponds to the unloading or loading state of the vehicle.

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