Parking braking device and system and vehicle

Abstract

The utility model provides a parking braking device and system with high parking efficiency and a vehicle. On one hand, the provided parking braking device comprises a hydraulic hand brake valve, and an oil inlet and an oil return opening of the hydraulic hand brake valve communicate with an oil tank; and the double-promotion brake is connected with an oil outlet of the hydraulic hand brake valve, and the double-promotion brake is used for switching between a parking braking state and a braking release state under the control of the hydraulic hand brake valve. Therefore, the resource utilization efficiency and the parking efficiency of the parking brake device can be improved.

Description

Technical Field

[0001] This application relates to the field of vehicle braking technology, and in particular to a parking brake device, system and vehicle. Background Technology

[0002] The braking systems commonly used in current vehicles include either air braking or hydraulic braking.

[0003] For air pressure braking systems, the parking function is achieved through a spring energy storage structure acting on the rear wheels. The rear wheel air chamber adopts a dual-chamber structure, including a driving chamber and a parking chamber. The parking chamber is equipped with an energy storage spring, which can provide sufficient parking braking force.

[0004] For hydraulic braking systems, parking typically uses a mechanical cable-operated structure, with the actuator employing a lever-pull plate structure. The actuator has two installation locations: one is a central brake acting on the drive shaft; the other is integrated into the rear wheel drum brake.

[0005] The parking efficiency of existing pneumatic braking systems and hydraulic braking systems is relatively low. Utility Model Content

[0006] Therefore, it is necessary to provide a parking brake device, system, and vehicle with high parking efficiency to address the problems in the existing technology.

[0007] In a first aspect, this application provides a parking brake device, which adopts the following technical solution:

[0008] A parking brake device, comprising:

[0009] A hydraulic handbrake valve, wherein the oil inlet and oil return port of the hydraulic handbrake valve are respectively connected to an oil tank;

[0010] A dual-actuator brake is connected to the oil outlet of the hydraulic handbrake valve. The dual-actuator brake is used to switch between the parking brake state and the brake release state under the control of the hydraulic handbrake valve.

[0011] In one embodiment, the parking brake device further includes an oil pump, the oil pump inlet being connected to the oil tank, and the oil pump outlet being connected to the hydraulic handbrake valve.

[0012] In one embodiment, a hydraulic accumulator is further included between the oil pump and the hydraulic handbrake valve. The first end of the hydraulic accumulator is connected to the oil outlet of the oil pump, and the second end of the hydraulic accumulator is connected to the oil inlet of the hydraulic handbrake valve.

[0013] In one embodiment, the oil pump and the hydraulic handbrake valve further include a one-way valve, the first end of which is connected to the oil outlet of the oil pump, and the second end of which is connected to the oil inlet of the hydraulic handbrake valve.

[0014] In one embodiment, a hydraulic sensor is provided on the pipeline between the oil pump outlet and the hydraulic handbrake valve inlet.

[0015] In one embodiment, the dual-actuator brake includes a parking actuation mechanism and a spring energy storage cylinder, wherein a first end of the spring energy storage cylinder is connected to the oil outlet of the hydraulic handbrake valve, and a second end of the spring energy storage cylinder is connected to the parking actuation mechanism.

[0016] In one embodiment, the spring energy storage cylinder includes a piston and an energy storage spring, the energy storage spring being used to compress or release under the action of the piston.

[0017] In one embodiment, the parking brake device further includes a steering power pump, a first end of which is connected to the hydraulic handbrake valve and to the steering gear, and a second end of which is connected to the steering oil reservoir.

[0018] Secondly, this application provides a parking brake system that includes a parking brake device as described in the first aspect.

[0019] Thirdly, this application provides a vehicle including the parking brake system as provided in the second aspect.

[0020] The aforementioned parking brake device, system, and vehicle, in which the parking brake device includes: a hydraulic handbrake valve, the inlet and outlet of which are connected to an oil tank; and a dual-actuator brake connected to the outlet of the hydraulic handbrake valve, used to switch between parking brake and brake release states under the control of the hydraulic handbrake valve. In this way, the parking force is linearly adjusted using the hydraulic handbrake valve, and sufficient parking brake performance is provided using the dual-actuator brake. The overall system structure is simple, reducing the complexity of the parking brake device and thus improving the resource utilization efficiency and parking performance of the parking brake device. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the parking brake system provided in one embodiment;

[0022] Figure 2 This is a schematic diagram of the parking brake system provided in another embodiment.

[0023] Attached image annotations:

[0024] 1. Hydraulic handbrake valve; 2. Dual-actuator brake; 3. Check valve; 4. Oil pump; 5. Hydraulic accumulator; 6. Oil tank; 61. Steering oil tank; 7. Hydraulic sensor; 8. Steering power pump; 9. Steering gear. Detailed Implementation

[0025] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0026] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0027] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0028] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0029] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0030] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0031] The following is in conjunction with the appendix Figure 1-2 The embodiments of this application will be described in further detail.

[0032] See Figure 1 , Figure 1 The diagram shows a schematic of the parking brake device according to an embodiment of the present application. The parking brake device provided in an embodiment of the present application includes a hydraulic handbrake valve 1, the oil inlet and oil outlet of the hydraulic handbrake valve 1 being connected to an oil tank 6 respectively; and a dual-actuator brake 2, which is connected to the oil outlet of the hydraulic handbrake valve 1. The dual-actuator brake 2 is used to switch between the parking brake state and the brake release state under the control of the hydraulic handbrake valve 1.

[0033] The hydraulic handbrake valve 1 consists of a valve body, a valve core, a drive mechanism, and a force transmission mechanism. The drive mechanism includes a pull rod and a cam, while the force transmission mechanism includes a valve stem and rollers. The valve body has an inlet, an outlet, and a return port, and contains a valve core cavity. The pull rod and cam are connected, driving the valve stem to push the valve core. The valve stem and valve core are connected by a balance spring, which makes the outlet pressure controllable. The valve core and valve core cavity are sealed by a sealing ring. The pull rod can be locked in two positions and can also rotate from one position to the other. When the pull rod is in the first position, the outlet has high pressure; when the pull rod is in the second position, the outlet is unloaded. During the rotation of the pull rod from the first position to the second position, hydraulic oil flows from the outlet to the return port, and the outlet pressure gradually decreases with the rotation angle of the pull rod. During the rotation of the pull rod from the second position to the first position, hydraulic oil flows from the inlet to the outlet, and the outlet pressure gradually increases with the rotation angle of the pull rod.

[0034] A balance spring is housed within the valve body. Its first end contacts the valve core, applying a linear force to it to adjust its linear position. The second end contacts the valve stem, compressing or releasing its elastic force as the stem moves. Specifically, when the control lever moves the valve stem, the balance spring compresses or releases in response, dynamically regulating the hydraulic oil pressure through its elastic force on the valve core. The force exerted by the balance spring on the valve core balances the force exerted by the hydraulic oil. Changes in outlet pressure directly correspond to the spring's compression, resulting in a linear decrease in outlet pressure as the cam rotates. This linear pressure change allows for gradual release of braking force, ensuring smooth brake release during parking.

[0035] In one possible implementation, the dual-actuator brake 2 in the provided parking brake device includes: a parking actuation mechanism and a spring energy storage cylinder, the first end of the spring energy storage cylinder being connected to the oil outlet of the hydraulic handbrake valve 1; and the second end of the spring energy storage cylinder being connected to the parking actuation mechanism.

[0036] The parking actuation mechanism is used to generate parking braking force. Optionally, the parking actuation mechanism can be a wedge-type actuator. A wedge-type actuator is a braking actuation device designed based on mechanical principles, mainly comprising: a wedge, a guide rail, and a spring mechanism. Under the power of the spring energy storage cylinder, the wedge in the wedge-type actuator can move along the guide rail and insert into the gap between the braking components. The inclined structure of the wedge converts the pushing force along the extension direction of the guide rail into pressure perpendicular to the inclined structure, acting on the braking components. Through the self-locking characteristic of the wedge, a strong parking braking force is formed.

[0037] In one possible implementation, the spring energy storage cylinder includes a piston and an energy storage spring, the energy storage spring being used to compress or release under the action of the piston. Optionally, the spring energy storage cylinder further includes: a base, one side of the upper end of the base having a first interface connected to a vent screw, and the other side having a second interface communicating with the oil outlet of the hydraulic handbrake valve 1, the first interface and the second interface being connected through an internal pipeline; a push rod at the lower end of the piston, the push rod passing through the central hole of the base, the upper end of the piston contacting a spring seat; the spring seat is located above the boss of the base, the lower end of the energy storage spring contacting the spring seat, and the upper end of the energy storage spring contacting the housing.

[0038] In one possible implementation, the provided parking brake device further includes an oil pump 4, the oil inlet of which is connected to an oil tank 6, and the oil outlet of which is connected to a hydraulic handbrake valve 1.

[0039] Among them, the oil pump 4 converts the oil in the oil tank 6 into high-pressure oil, which flows into the hydraulic handbrake valve 1 through the oil inlet, flows into the double-actuator brake 2 from the oil outlet of the hydraulic handbrake valve 1, and flows back to the oil tank 6 from the oil return port of the hydraulic handbrake valve 1.

[0040] When it is necessary to release the parking brake, the hydraulic handbrake valve 1 is activated, connecting the oil inlet and outlet of the hydraulic handbrake valve 1. The high-pressure oil in the oil pump 4 passes through the oil inlet, internal passage and oil outlet of the hydraulic handbrake valve 1, and enters the spring energy storage cylinder through the second interface of the spring energy storage cylinder of the double-actuator brake 2. The piston is pushed upward, and the piston pushes the spring seat, compressing the energy storage spring and thus releasing the parking brake.

[0041] When parking brake is required, the hydraulic handbrake valve 1 is activated, connecting the oil outlet and return port of the hydraulic handbrake valve 1. The high-pressure oil in the spring energy storage cylinder flows from the second interface through the oil outlet, internal passage and return port of the hydraulic handbrake valve 1 to the oil tank 6. The energy storage spring is released, pushing the spring seat and piston in the spring energy storage cylinder to move downward. The push rod at the lower end of the piston moves downward accordingly, realizing parking brake.

[0042] In one possible implementation, the dual-actuator brake 2 in the provided parking brake device further includes a service actuation mechanism, which can optionally be a hydraulic caliper. Upon receiving an external braking signal, such as when the driver depresses the brake pedal, the hydraulic braking system activates. The brake fluid transmits pressure to the hydraulic caliper, which pushes the brake pads or clamps the brake disc, generating friction with the wheels to achieve service braking. During this process, the energy storage spring in the spring energy storage cylinder is in a compressed state and does not participate in direct braking.

[0043] In one possible implementation, the driving actuation mechanism can be of various types, such as vacuum-assisted, pneumatic-assisted, hydraulic-assisted, or EHB (Electric Hydraulic Brake).

[0044] In this way, the parking brake device combines the parking brake performance with the service brake performance through the dual-actuator brake 2. One device can realize both service braking and parking braking at the same time, which can effectively simplify the design of the braking system and support the use of hydraulic braking systems for trucks with larger total weight, thereby reducing costs and improving efficiency.

[0045] The parking brake device provided in the above embodiments includes: a hydraulic handbrake valve 1, the inlet and outlet of which are respectively connected to an oil tank 6; and a dual-actuator brake 2, connected to the outlet of the hydraulic handbrake valve 1, which is used to switch between the parking brake state and the brake release state under the control of the hydraulic handbrake valve 1. In this way, the parking force is linearly adjusted using the hydraulic handbrake valve 1, and sufficient parking brake efficiency is provided using the dual-actuator brake 2. The overall system structure is simple, reducing the complexity of the parking brake device and thus improving the resource utilization efficiency of the parking brake device.

[0046] In an exemplary embodiment, the provided parking brake device further includes a hydraulic accumulator 5 between the oil pump 4 and the hydraulic handbrake valve 1. The first end of the hydraulic accumulator 5 is connected to the oil outlet of the oil pump 4, and the second end of the hydraulic accumulator 5 is connected to the oil inlet of the hydraulic handbrake valve 1.

[0047] The hydraulic accumulator 5 is pre-filled with hydraulic oil at a certain pressure. When the parking brake needs to be released, the hydraulic oil stored in the accumulator 5 is guided through the hydraulic handbrake valve 1 into the spring energy storage cylinder of the dual-actuator brake 2, compressing the energy storage spring and thus releasing the parking brake. The hydraulic accumulator 5 can provide a stable hydraulic source for a short time, maintaining the pressure of the parking brake device and ensuring continuous operation of the parking brake device. This ensures that even if the oil pump 4 fails to work in time, the parking brake device can still quickly release the parking brake using the hydraulic oil stored in the hydraulic accumulator 5, avoiding failure to release the parking brake due to insufficient pressure or pressure fluctuations in the oil pump 4. The hydraulic accumulator 5 can also absorb pressure fluctuations or instantaneous pressure changes that may occur during the operation of the parking brake device, playing a buffering role in pressure fluctuations, thereby protecting the hydraulic components such as the oil pump 4 and the hydraulic handbrake valve 1 in the parking brake device from impact.

[0048] In one possible implementation, the provided parking brake device further includes a one-way valve 3 between the oil pump 4 and the hydraulic handbrake valve 1. The first end of the one-way valve 3 is connected to the oil outlet of the oil pump 4, and the second end of the one-way valve 3 is connected to the oil inlet of the hydraulic handbrake valve 1.

[0049] Among them, the one-way valve 3 is used to ensure that hydraulic oil can only flow from the hydraulic pump to the hydraulic handbrake valve 1, which can ensure the single direction of hydraulic oil flow, prevent hydraulic oil from flowing back to the oil pump 4 from the oil inlet of the hydraulic handbrake valve 1, maintain the stability of the pressure in the parking brake device, and avoid operation failure due to hydraulic backflow when parking brake is applied or released.

[0050] In one possible implementation, in the parking brake device, the first end of the one-way valve 3 is connected to the oil outlet of the oil pump 4, and the second end of the one-way valve 3 is connected to the first end of the hydraulic accumulator 5. In this way, the one-way valve 3 can prevent the backflow of hydraulic oil after pressure release, thereby effectively maintaining the high-pressure state in the hydraulic accumulator 5. Even if the oil stops working, it can ensure that the parking brake device uses the hydraulic oil in the hydraulic accumulator 5 for parking braking when needed. The one-way valve 3 can also prevent the back impact of high-pressure hydraulic oil from damaging the oil pump 4, thereby extending the service life of the oil pump 4.

[0051] Optionally, the check valve 3 can be integrated inside the oil pump 4.

[0052] In one possible implementation, the provided parking brake device has a hydraulic sensor 7 on the pipeline between the oil pump 4 outlet and the hydraulic handbrake valve 1 inlet.

[0053] The hydraulic sensor 7 monitors the pressure of the high-pressure oil in the pipeline between the oil pump 4 outlet and the hydraulic handbrake valve 1 inlet and outputs a corresponding electrical signal. When the oil pressure reaches a preset condition, it controls the oil pump 4 to start or stop. The hydraulic sensor 7 includes sensing elements such as strain gauges, piezoresistive elements, or capacitive elements to sense changes in hydraulic oil pressure; it also includes a signal conversion module to convert the pressure signal into an electrical signal.

[0054] In the event of abnormal conditions such as oil pump 4 failure, pipeline leakage, or hydraulic accumulator 5 failure, hydraulic sensor 7 can detect insufficient or excessive pressure in the parking brake system's pipeline, and promptly adjust the working state of oil pump 4 to improve the safety of the parking brake system.

[0055] In an exemplary embodiment, the provided parking brake device further includes a steering power pump 8, the first end of which is connected to the hydraulic handbrake valve 1 and to the steering gear 9, and the second end of which is connected to the steering oil reservoir 61.

[0056] The steering fluid reservoir 61 serves as a return and storage device for the vehicle's steering system, collecting return fluid and providing hydraulic power to the parking brake. The steering power pump 8 provides hydraulic power to the steering system, converting the hydraulic fluid in the reservoir 61 into high-pressure hydraulic fluid, which is then supplied to the hydraulic handbrake valve 1 in the parking brake and the steering gear 9 in the steering system. The steering gear 9 is a key component of the steering system, converting the hydraulic energy from the reservoir 61 and the steering power pump 8 into mechanical steering action.

[0057] In one possible implementation, the parking brake device also includes a one-way valve 3, which is used to prevent the hydraulic oil in the pipeline from flowing back, ensuring that the high-pressure oil in the current pipeline flows from the power steering pump 8 to the hydraulic handbrake valve 1 in the parking brake device, and does not flow back to the power steering pump 8, thereby improving the pressure stability in the parking brake device and protecting the steering system from pressure back shock.

[0058] When it is necessary to release the parking brake, the hydraulic handbrake valve 1 is activated, connecting the oil inlet and outlet of the hydraulic handbrake valve 1. The hydraulic oil in the steering oil tank 61 passes through the steering power pump 8, the one-way valve 3, the oil inlet, internal passage and oil outlet of the hydraulic handbrake valve 1, and further enters the spring energy storage cylinder of the dual-actuator brake 2, compressing the energy storage spring and realizing the release of the parking brake.

[0059] When parking brake is required, the hydraulic handbrake valve 1 is activated, connecting the oil outlet and return port of the hydraulic handbrake valve 1. The high-pressure oil in the spring energy storage cylinder of the dual-actuator brake 2 is discharged to the steering oil tank 61 through the hydraulic handbrake valve 1, the energy storage spring is released, and braking force is applied to complete the parking brake.

[0060] In this embodiment, the parking brake system and the steering system share the steering oil reservoir 61. The hydraulic resources in the steering system provide the hydraulic power source for the parking brake device. Simultaneously, a well-designed hydraulic pipeline achieves an organic integration of the two systems, reducing the need for a separate hydraulic power source and oil pump 4, thereby simplifying the vehicle structure. The cooperation between the one-way valve 3 and the hydraulic handbrake valve 1 ensures the flow direction and pressure control of the hydraulic oil, improving the reliability of the parking brake device.

[0061] See Figure 1 and Figure 2 The parking brake device provided in one embodiment of this application includes:

[0062] Hydraulic handbrake valve 1, the oil inlet and oil return port of hydraulic handbrake valve 1 are respectively connected to oil tank 6;

[0063] A dual-actuator brake 2, connected to the outlet of the hydraulic handbrake valve 1, is used to switch between the parking brake state and the brake release state under the control of the hydraulic handbrake valve 1. The dual-actuator brake 2 includes a parking actuation mechanism and a spring accumulator cylinder. The first end of the spring accumulator cylinder is connected to the outlet of the hydraulic handbrake valve 1; the second end of the spring accumulator cylinder is connected to the parking actuation mechanism. The spring accumulator cylinder includes a piston and an energy storage spring, the energy storage spring being compressed or released under the action of the piston.

[0064] Oil pump 4, the oil inlet of oil pump 4 is connected to oil tank 6, and the oil outlet of oil pump 4 is connected to hydraulic hand brake valve 1.

[0065] The oil pump 4 and the hydraulic handbrake valve 1 are further connected by a hydraulic accumulator 5. The first end of the hydraulic accumulator 5 is connected to the oil outlet of the oil pump 4, and the second end of the hydraulic accumulator 5 is connected to the oil inlet of the hydraulic handbrake valve 1.

[0066] The oil pump 4 and the hydraulic handbrake valve 1 are further connected by a check valve 3. The first end of the check valve 3 is connected to the oil outlet of the oil pump 4, and the second end of the check valve 3 is connected to the oil inlet of the hydraulic handbrake valve 1.

[0067] A hydraulic sensor 7 is installed on the pipeline between the oil outlet of the oil pump 4 and the oil inlet of the hydraulic handbrake valve 1.

[0068] In one exemplary embodiment, a parking brake system is provided, including the parking brake device provided in the above embodiments.

[0069] In one exemplary embodiment, a vehicle is provided that includes the parking brake system provided in the above embodiments.

[0070] In the description of this specification, references to terms such as "some embodiments," "other embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative descriptions of the above terms do not necessarily refer to the same embodiments or examples.

[0071] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0072] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A parking brake device characterized by comprising: The parking brake device comprises: a hydraulic hand brake valve, an oil inlet and an oil return of which are communicated with an oil tank; a double-boost brake connected with an oil outlet of the hydraulic hand brake valve, which is used to switch between a parking brake state and a brake release state under the control of the hydraulic hand brake valve.

2. The parking brake device according to claim 1, characterized in that The parking brake device further comprises an oil pump, an oil inlet of which is communicated with the oil tank, and an oil outlet of which is connected with the hydraulic hand brake valve.

3. A parking brake device according to claim 2, characterised in that The oil pump and the hydraulic hand brake valve further comprise a hydraulic accumulator, a first end of which is communicated with the oil outlet of the oil pump, and a second end of which is communicated with the oil inlet of the hydraulic hand brake valve.

4. The parking brake device according to claim 2, characterized in that The oil pump and the hydraulic hand brake valve further comprise a one-way valve, a first end of which is communicated with the oil outlet of the oil pump, and a second end of which is communicated with the oil inlet of the hydraulic hand brake valve.

5. The parking brake device according to claim 2, characterized in that A hydraulic sensor is arranged on a pipeline between the oil outlet of the oil pump and the oil inlet of the hydraulic hand brake valve.

6. The parking brake device according to claim 1, characterized in that The double-boost brake comprises a parking boost mechanism and a spring energy storage cylinder, a first end of the spring energy storage cylinder is communicated with the oil outlet of the hydraulic hand brake valve, and a second end of the spring energy storage cylinder is connected with the parking boost mechanism.

7. The parking brake device according to claim 1, characterized by The spring energy storage cylinder comprises a piston and an energy storage spring, which is used to compress or release under the action of the piston.

8. The parking brake device according to claim 1, characterized in that The parking brake device further comprises a steering power pump, a first end of which is connected with the hydraulic hand brake valve and a steering gear, and a second end of which is connected with a steering oil tank.

9. A parking brake system characterized by, The parking brake device comprises the parking brake device according to any one of claims 1-8.

10. A vehicle characterized by comprising: The parking brake system comprises the parking brake system according to claim 9.

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