Tractor electric control parking brake valve group and tractor

Abstract

The utility model relates to a tractor electric control parking brake valve group and tractor, the tractor electric control parking brake valve group comprises a control valve and an electromagnetic valve, the control valve is provided with an oil inlet P, an oil return port T and an oil outlet, the oil outlet can be communicated with the oil inlet P or the oil return port T, a valve core mechanical push rod at one end of the control valve is used for connecting a hand brake push rod of the tractor; the electromagnetic valve is provided with an oil inlet connector, an oil outlet connector A and an oil return connector, and the oil outlet connector A can be communicated with the oil inlet connector or the oil return connector; the oil inlet connector is communicated with the oil outlet through a pipeline, and the oil outlet connector A is used for being communicated with an executing mechanism. The utility model has the beneficial effects that the structure is simple, the design is reasonable, the parking braking is controlled by electric control and manual control together, the safety is higher, and the response time is short; in addition, the device can be combined with service braking to jointly achieve emergency braking and braking under unmanned driving.

Description

Technical Field

[0001] The utility model relates to the technical field of tractor braking, in particular to an electronically controlled parking brake valve group for a tractor and a tractor. Background Art

[0002] Most existing tractor parking brakes use a handbrake cable to control the compression of the brake pads to achieve braking. This method has the following drawbacks:

[0003] 1. Relying on mechanical connection control, connection failure will cause parking brake failure;

[0004] 2. Slow response time. Utility Model Content

[0005] The utility model provides an electronically controlled parking brake valve group for a tractor and a tractor, aiming to solve the problems in the prior art.

[0006] The technical solution of the utility model to solve the above technical problems is as follows:

[0007] A tractor electronically controlled parking brake valve assembly includes a control valve and a solenoid valve. The control valve is provided with an oil inlet P, an oil return port T, and an oil outlet. The oil outlet can be communicated with the oil inlet P or the oil return port T. A valve core mechanical push rod at one end of the control valve is used to connect to the tractor's handbrake push rod.

[0008] The solenoid valve is provided with an oil inlet interface, an oil outlet interface A and an oil return interface. The oil outlet interface A can be connected to the oil inlet interface or the oil return interface; the oil inlet interface is connected to the oil outlet through a pipeline, and the oil outlet interface A is used to connect to the actuator.

[0009] The beneficial effects of the utility model are as follows: under normal circumstances, the handbrake is not actuated and the solenoid valve is not energized. At this time, the valve core of the control valve is in the lower position and the valve core of the solenoid valve is in the upper position. At this time, the oil return port T is connected to the oil outlet port A, and the vehicle is in a braking state;

[0010] When the vehicle is started and powered on, the solenoid valve is energized and the valve core is in the lower position. At this time, the oil return port T is connected to the oil outlet interface A, and the vehicle is in the braking state; when the vehicle is driving, the parking brake is released, the valve core of the control valve is in the upper position, and the solenoid valve is de-energized, so that the valve core is in the upper position. At this time, the oil inlet port P is connected to the oil outlet interface A to release the brake;

[0011] When parking on a slope, pull the handbrake and the valve core of the control valve is in the lower position. At this time, the oil return port T is connected to the oil outlet interface A, and the vehicle is in a braking state. During emergency braking, the solenoid valve is energized and the valve core is in the lower position. At this time, the oil return port T is connected to the oil outlet interface A, and the vehicle is in a braking state.

[0012] The utility model has a simple structure and a reasonable design. The parking brake is controlled by both electronic control and manual control, which is safer and has a faster response time. In addition, it can be combined with the service brake to achieve emergency braking and braking under unmanned driving.

[0013] On the basis of the above technical solution, the present invention can also be improved as follows.

[0014] Furthermore, the oil outlet is also connected to the interface at the other end of the control valve through a hydraulic oil circuit.

[0015] The beneficial effects of adopting the above further solution are simple structure, reasonable design, and hydraulic control oil circuit, which acts on the lower end of the control valve, thereby reducing the force of pulling the handbrake and making operation easier.

[0016] Furthermore, a throttle valve is installed on the hydraulic control oil circuit.

[0017] The beneficial effects of adopting the above further solution are simple structure, reasonable design, and the use of a throttle valve to control the amount of oil in the hydraulic control oil circuit to ensure stable operation of the system.

[0018] Furthermore, the oil return port T is connected to the oil return interface through a merging pipeline.

[0019] The beneficial effects of adopting the above further solution are simple structure, reasonable design, the oil return port T and the oil return interface are merged into one oil tank, the pipeline distribution is simpler and the cost is low.

[0020] Furthermore, the oil drain circuit in the control valve is connected to the oil return port T through an unloading oil circuit.

[0021] The beneficial effect of adopting the above-mentioned further scheme is that the unloading oil circuit is connected to the oil drain circuit inside the valve body. First, it can prevent the pressure from increasing due to leakage of the valve core of the control valve itself, which will make the handbrake heavier and affect the braking effect; in addition, during the process of pulling up the handbrake, the residual gas in the oil channel can also be discharged to prevent other problems caused by the presence of gas.

[0022] Furthermore, the control valve is a three-position three-way valve, and the solenoid valve is a two-position three-way valve.

[0023] The beneficial effects of adopting the above further solution are simple structure, reasonable design, and reasonable selection of types of control valves and solenoid valves, which ensure the smooth progress of operations.

[0024] The utility model also relates to a tractor, comprising the tractor electronically controlled parking brake valve group as described above.

[0025] The beneficial effect of adopting the above further solution is that the utility model also provides a tractor with a simple structure and reasonable design. The parking brake is controlled by both electronic and manual control, which is safer and has a faster response time. In addition, it can be combined with the service brake to jointly realize emergency braking and braking under unmanned driving.

[0026] Furthermore, it also includes a handbrake push rod, which is connected to one end of the control valve.

[0027] The beneficial effects of adopting the above further solution are simple structure and reasonable design. During operation, the operator manually operates the handbrake push rod to change the position of the control valve core, which is easy to operate and saves time and effort.

[0028] Furthermore, it also includes an actuator, which is connected to the oil outlet port A through a pipeline.

[0029] The beneficial effects of adopting the above further solution are simple structure, reasonable design, and utilizing the oil delivered from the oil outlet port A to drive the actuator to operate.

[0030] Furthermore, the actuator is a brake.

[0031] The beneficial effects of adopting the above further solution are simple structure, reasonable design, and utilizing the oil delivered from the oil outlet interface A to drive the brake to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a schematic diagram of the utility model.

[0033] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0034] 1. Control valve; 2. Solenoid valve; 3. Junction pipeline; 4. Unloading oil circuit; 5. Valve core mechanical push rod; 6. Hydraulic control oil circuit; 7. Throttle valve. DETAILED DESCRIPTION

[0035] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein can be combined with each other.

[0036] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0037] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0038] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0039] Example 1

[0040] like Figure 1 As shown, this embodiment provides an electronically controlled parking brake valve group for a tractor, comprising a control valve 1 and a solenoid valve 2. The control valve 1 is provided with an oil inlet P, an oil return port T, and an oil outlet. The oil outlet can be communicated with the oil inlet P or the oil return port T. A valve core mechanical push rod 5 at one end of the control valve 1 is used to connect to the handbrake push rod of the tractor.

[0041] The solenoid valve 2 is provided with an oil inlet interface, an oil outlet interface A and an oil return interface. The oil outlet interface A can be connected to the oil inlet interface or the oil return interface; the oil inlet interface is connected to the oil outlet through a pipeline, and the oil outlet interface A is used to connect to the actuator.

[0042] Under normal circumstances, the handbrake is not in operation and the solenoid valve is not energized. At this time, the valve core of the control valve is in the lower position and the valve core of the solenoid valve is in the upper position. At this time, the oil return port T is connected to the oil outlet port A, and the vehicle is in the braking state;

[0043] When the vehicle is started and powered on, the solenoid valve is energized and the valve core is in the lower position. At this time, the oil return port T is connected to the oil outlet interface A, and the vehicle is in the braking state; when the vehicle is driving, the parking brake is released, the valve core of the control valve is in the upper position, and the solenoid valve is de-energized, so that the valve core is in the upper position. At this time, the oil inlet port P is connected to the oil outlet interface A to release the brake;

[0044] When parking on a slope, the parking brake is applied, and the control valve's spool is in the lower position. This connects the oil return port T to the oil outlet port A, putting the vehicle in a braking state. During emergency braking, the solenoid valve is energized, the spool is in the lower position, and the oil return port T connects to the oil outlet port A, putting the vehicle in a braking state. Based on the above solution, the oil inlet P is connected to an oil supply port, such as a fuel tank, while the oil return port T is connected to the fuel tank.

[0045] In addition, the valve core mechanical push rod 5 of the control valve 1 is connected to the handbrake push rod of the tractor. By pulling up or releasing the handbrake, the push rod is controlled, and then the reversing of the valve core of the valve 1 is controlled.

[0046] Moreover, the solenoid valve 2 controls the valve core to switch by being energized or de-energized.

[0047] This embodiment has a simple structure and reasonable design. The parking brake is controlled by both electronic and manual control, which is safer and has a faster response time. In addition, it can be combined with the service brake to achieve emergency braking and braking under unmanned driving.

[0048] Example 2

[0049] On the basis of Example 1, in this embodiment, the oil outlet is further connected to the interface at the other end of the control valve 1 through the hydraulic control oil circuit 6 .

[0050] This solution has a simple structure and a reasonable design. The hydraulic control oil circuit 6 acts on the lower end of the control valve 1, which reduces the force of pulling the handbrake and makes the operation easier.

[0051] Example 3

[0052] On the basis of Example 2, in this embodiment, a throttle valve 7 is installed on the hydraulic control oil circuit 6 .

[0053] This solution has a simple structure and a reasonable design. The throttle valve 7 is used to control the amount of oil in the hydraulic control oil circuit 6 to ensure stable operation of the system.

[0054] Example 4

[0055] On the basis of the above embodiments, in this embodiment, the oil return port T is communicated with the oil return interface through a merging pipeline 3 .

[0056] This solution has a simple structure and reasonable design. The oil return port T and the oil return interface are merged into one oil tank, which makes the pipeline distribution simpler and the cost low.

[0057] Alternatively, the oil return port T and the oil return interface may also be connected to the oil tank through pipelines respectively, but the pipeline distribution of this solution is relatively complicated.

[0058] Example 5

[0059] On the basis of embodiment 4, in this embodiment, the oil drain circuit in the control valve 1 is connected to the oil return port T through the unloading oil passage 4 .

[0060] The unloading oil circuit 4 is connected to the oil drain circuit inside the valve body of the control valve 1. Firstly, it can prevent the pressure from increasing due to leakage of the valve core of the control valve 1 itself, which will make the handbrake heavier and affect the braking effect; in addition, during the process of pulling up the handbrake, the residual gas in the oil channel can be discharged to prevent other problems caused by the presence of gas.

[0061] Example 6

[0062] On the basis of the above embodiments, in this embodiment, the control valve 1 is a three-position three-way valve, and the solenoid valve 2 is a two-position three-way valve.

[0063] This solution has a simple structure and reasonable design. The types of control valve 1 and solenoid valve 2 are reasonably selected to ensure the smooth progress of the operation.

[0064] Example 7

[0065] On the basis of the above embodiments, this embodiment further provides a tractor, comprising the tractor electronically controlled parking brake valve assembly as described above.

[0066] This embodiment also provides a tractor with a simple structure and reasonable design. The parking brake is controlled by both electronic and manual control, which is safer and has a faster response time. In addition, it can be combined with the service brake to achieve emergency braking and braking under unmanned driving.

[0067] Example 8

[0068] On the basis of Example 7, this embodiment further includes a handbrake push rod, which is connected to one end of the control valve 1.

[0069] The solution has a simple structure and a reasonable design. During operation, the operator manually operates the handbrake push rod to change the position of the control valve core, which is easy to operate and saves time and effort.

[0070] Example 9

[0071] On the basis of any one of Examples 7 to 8, this embodiment further includes an actuator, which is connected to the oil outlet port A through a pipeline.

[0072] This solution has a simple structure and reasonable design, and utilizes the oil delivered from the oil outlet port A to drive the actuator to operate.

[0073] Example 10

[0074] Based on Example 9, in this embodiment, the actuator is a brake.

[0075] This solution has a simple structure and reasonable design, and utilizes the oil delivered from the oil outlet interface A to drive the brake to operate.

[0076] The working principle of this utility model is as follows:

[0077] Under normal circumstances, the handbrake is not in operation and the solenoid valve is not energized. At this time, the valve core of the control valve is in the lower position and the valve core of the solenoid valve is in the upper position. At this time, the oil return port T is connected to the oil outlet port A, and the vehicle is in the braking state;

[0078] When the vehicle is started and powered on, the solenoid valve is energized and the valve core is in the lower position. At this time, the oil return port T is connected to the oil outlet interface A, and the vehicle is in the braking state; when the vehicle is driving, the parking brake is released, the valve core of the control valve is in the upper position, and the solenoid valve is de-energized, so that the valve core is in the upper position. At this time, the oil inlet port P is connected to the oil outlet interface A to release the brake;

[0079] When parking on a slope, pull the handbrake and the valve core of the control valve is in the lower position. At this time, the oil return port T is connected to the oil outlet interface A, and the vehicle is in a braking state. During emergency braking, the solenoid valve is energized and the valve core is in the lower position. At this time, the oil return port T is connected to the oil outlet interface A, and the vehicle is in a braking state.

[0080] This valve group is controlled by the valve core a of the control valve 1 and the valve core b of the solenoid valve 2. To release the parking brake, the following conditions must be met simultaneously: ① When the parking brake is released, the valve core b is in the upper position under the action of the push rod; ② When the solenoid valve 2 loses power, the valve core a is in the upper position under the action of the spring or the electromagnetic force of the energized solenoid valve. At this time, the oil inlet P and the oil outlet A are connected, which expands the disc spring in the brake and releases the brake.

[0081] Parking: During normal tractor driving, the brakes are released, and at the same time, conditions ①② are met, valve core a and valve core b are in the upper position. At this time, ③ the handbrake is pulled up, and the valve core b moves up under the action of the push rod and moves to the lower position. At this time, the oil outlet interface A is connected to the oil return port T, and the disc spring of the brake is tightened to form a brake; or ④ the solenoid valve 2 is energized, and the valve core a moves to the lower position under the action of the electromagnetic force. At this time, the oil outlet interface A is connected to the oil return port T through the internal oil circuit of the valve body, and the disc spring of the brake is tightened to form a brake.

[0082] In addition, since the valve core a can be reversed by electronic control, it can be achieved in emergency braking and unmanned driving situations. By associating the solenoid valve 2 with the emergency braking signal or the unmanned driving braking signal, braking can be achieved together with the tractor's service braking system, thereby improving braking performance and providing a layer of safety protection.

[0083] It should be noted that all electronic components involved in the present invention adopt existing technologies, and the above components are electrically connected to the controller, and the control circuits between the controller and the components are existing technologies.

[0084] The dotted boxes in the accompanying drawings have no other substantial meanings and merely indicate that the components within the boxes constitute the brake valve group.

[0085] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0086] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0087] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A tractor electronically controlled parking brake valve assembly, characterized in that: The invention comprises a control valve (1) and a solenoid valve (2); the control valve (1) is provided with an oil inlet P, an oil return port T and an oil outlet; the oil outlet can be communicated with the oil inlet P or the oil return port T; a valve core mechanical push rod (5) at one end of the control valve (1) is used to connect to a handbrake push rod of a tractor; The solenoid valve (2) is provided with an oil inlet interface, an oil outlet interface A and an oil return interface, wherein the oil outlet interface A can be communicated with the oil inlet interface or the oil return interface; the oil inlet interface is communicated with the oil outlet via a pipeline, and the oil outlet interface A is used to communicate with an actuator.

2. The tractor electronically controlled parking brake valve assembly according to claim 1, characterized in that: The oil outlet is also connected to the interface at the other end of the control valve (1) through a hydraulic oil circuit (6).

3. The tractor electronically controlled parking brake valve assembly according to claim 2, characterized in that: A throttle valve (7) is installed on the hydraulic control oil circuit (6).

4. The tractor electronically controlled parking brake valve assembly according to claim 1, characterized in that: The oil return port T is communicated with the oil return interface via a merging pipeline (3).

5. The tractor electronically controlled parking brake valve assembly according to claim 4, characterized in that: The oil drain circuit in the control valve (1) is connected to the oil return port T via an unloading oil circuit (4).

6. The tractor electronically controlled parking brake valve assembly according to any one of claims 1 to 5, characterized in that: The control valve (1) is a three-position three-way valve, and the solenoid valve (2) is a two-position three-way valve.

7. A tractor, characterized in that: The utility model comprises the tractor electronically controlled parking brake valve group as described in any one of claims 1 to 6.

8. The tractor according to claim 7, characterized in that: It also includes a handbrake push rod, which is connected to one end of the control valve (1).

9. The tractor according to claim 7, characterized in that: It also includes an actuator, which is connected to the oil outlet port A through a pipeline.

10. The tractor according to claim 9, characterized in that: The actuator is a brake.

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