Tractor hydraulic trailer brake auxiliary pipeline valve group and tractor

Abstract

The utility model relates to a tractor hydraulic trailer brake auxiliary pipeline valve group and a tractor, the valve group comprises a control valve and an electromagnetic valve, the electromagnetic valve is provided with a first interface, a second interface and a third interface, the second interface is communicated with one end of an oil return pipeline, and the third interface is communicated with one end of an oil supply pipeline; a fourth interface, a fifth interface and a sixth interface are arranged on the control valve, and the fourth interface is communicated with the fifth interface or the sixth interface; the interface I is communicated with a pilot cavity at one end of the control valve through a pipeline I; a spring interface on the electromagnetic valve is communicated with the pipeline I through a pipeline II; a fifth connector is communicated with the oil supply pipeline through a third pipeline, a spring connector on the control valve is communicated with the oil return pipeline through a fourth pipeline, and a sixth connector is communicated with the fourth pipeline through a fifth pipeline. A priority function, electric control pilot control, stable output pressure and electric control proportional pressure reduction are integrated in the hydraulic system, synchronous braking of a tractor and a trailer can be achieved, and traveling braking and parking braking of the trailer under unmanned driving can also be achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of tractors, in particular to a tractor hydraulic trailer brake auxiliary pipeline valve group and a tractor. Background Art

[0002] When a single oil source is used for oil supply, if multiple tasks are carried out simultaneously, the priority of trailer braking cannot be guaranteed; most of the existing direct-acting proportional pressure reducing valves have feedback pressure acting directly on both sides of the valve core, resulting in pressure oscillation problems. Utility Model Content

[0003] The utility model provides a tractor hydraulic trailer brake auxiliary pipeline valve group and a tractor, aiming to solve the problems in the prior art.

[0004] The technical solution of the utility model to solve the above technical problems is as follows:

[0005] A tractor hydraulic trailer brake auxiliary pipeline valve group includes a control valve and a solenoid valve. The solenoid valve is provided with a first interface, a second interface, and a third interface. The first interface is connected to the second interface or the third interface. The second interface is connected to one end of the oil return line, and the third interface is connected to one end of the oil supply line.

[0006] The control valve is provided with interface four, interface five and interface six, and interface four is connected with interface five or interface six; interface one is connected with the pilot chamber at one end of the control valve through pipeline one, and the spring interface on the solenoid valve is connected with pipeline one through pipeline two; interface five is connected with the oil supply pipeline through pipeline three, the spring interface on the control valve is connected with the oil return pipeline through pipeline four, and interface six is connected with pipeline four through pipeline five.

[0007] The beneficial effects of the utility model are as follows: during operation, when the solenoid valve loses power, the valve core a of the solenoid valve and the valve core b of the control valve are respectively in the lower position under the action of their own internal springs. At this time, the pilot chamber above the valve core b is connected to T through pipeline 1 and is pressureless. The P port is connected to the SL port through pipeline 3. The pressure of the SL port acts on the upper part of the valve core b through the hydraulic control oil circuit and is balanced with the spring force of the spring in the control valve, ensuring that the output pressure of the SL port is consistent with the spring force.

[0008] When the solenoid valve is energized, the valve core a moves downward under the action of the electromagnetic force, and the pressure at the P port reaches the pilot chamber of the valve core b through pipeline one. At the same time, the pressure is applied to the lower part of the valve core a through pipeline two. At this time, the electromagnetic force is balanced with the pilot force and the spring force of the self-set internal spring. Therefore, the pressure of the pilot chamber can be controlled by adjusting the current of the solenoid valve. The larger the current value, the greater the pilot pressure. At this time, the upper part of the valve core b is affected by the pilot force and SL pressure, and the lower part is affected by the spring force of the spring inside the control valve. The three work together. At this time, the pressure of the SL port is controlled by the pressure of the pilot chamber, that is, the larger the current value, the greater the pilot pressure, and the smaller the pressure at the SL port. When the pilot pressure is greater than the spring force of the spring inside the control valve, the valve core b is completely in the upper position, the SL port is connected to the T port through pipeline four, and the pressure is zero.

[0009] The utility model integrates priority function, electronic pilot control, stable output pressure, and electronic proportional pressure reduction, which can realize synchronous braking of the tractor and trailer, and can also realize driving brake and parking brake of the trailer under unmanned operation.

[0010] On the basis of the above technical solution, the present invention can also be improved as follows.

[0011] Furthermore, the interface four is connected to one end of the control pipeline, and the other end of the control pipeline is used to connect to the actuator.

[0012] The beneficial effect of adopting the above further solution is simple structure and reasonable design. The pressure of the four interfaces acts on the upper part of the valve core b through the control pipeline and balances the spring force of the spring inside the control valve, ensuring that the output pressure of the four interfaces is consistent with the spring force.

[0013] Furthermore, a pressure sensor is fixedly installed on the control pipeline.

[0014] The beneficial effects of adopting the above further solution are simple structure, reasonable design, and the use of pressure sensors to monitor the pressure at four locations of the interface in real time.

[0015] Furthermore, the control pipeline is connected to one end of the control valve core cavity through a hydraulic control oil circuit, and a throttle valve is fixedly installed on the hydraulic control oil circuit.

[0016] The beneficial effects of adopting the above further solution are simple structure, reasonable design, and utilizing the hydraulic control oil circuit to control the position of the valve core b of the above control valve.

[0017] Furthermore, it also includes a priority valve, which is provided with an interface seven and an interface eight that are connected or disconnected to each other; the interface eight is connected to the oil supply pipeline through the pipeline six, the interface seven is connected to one end of the execution pipeline, and the other end of the execution pipeline is used to connect to other execution structures.

[0018] The beneficial effect of adopting the above further solution is that if the system is supplied by a single oil source, in order to ensure the priority of braking, the valve group can be expanded to add a priority function, adding a valve core c, a feedback oil port LS, and an output oil port AUX, where the LS port is connected to the load of the actuator such as the brake, and the AUX port is connected to other actuators;

[0019] When the pump can meet the flow requirements of the AUX port and the brake, the P port pressure pushes the priority valve c through the corresponding oil circuit, the valve core is in the left position, and the pump supplies oil to the AUX and brake at the same time. When the pump cannot meet the flow requirements of the AUX port and the brake, the plunger pump is in a flow saturation state, and the difference between the P port pressure and the LS pressure continues to decrease, △P≈0, the valve core is in the right position under the push of the spring, the P port and the AUX port are disconnected, and the brake is given priority.

[0020] Furthermore, the spring interface on the priority valve is communicated with one end of the LS feedback pipeline.

[0021] The beneficial effects of adopting the above further solution are simple structure, reasonable design, and utilizing the LS feedback pipeline to feed back relevant signals of the brake.

[0022] Furthermore, the valve core cavity interface on the priority valve is connected to the pipeline six through the pipeline seven.

[0023] The beneficial effects of adopting the above further solution are simple structure and reasonable design. The valve core cavity interface on the priority valve is connected to the pipeline 6 via the pipeline 7 to change the position of the valve core c.

[0024] Furthermore, the priority valve is a two-position two-way valve.

[0025] The beneficial effects of adopting the above further solution are that the two-position two-way valve has a simple structure, a fast response speed and strong adaptability.

[0026] Furthermore, the solenoid valve is a two-position three-way proportional solenoid valve, and the control valve is a two-position three-way valve.

[0027] The beneficial effects of adopting the above further solution are that the proportional solenoid valve has a simple structure, high-precision control, fast response and good stability; at the same time, the two-position three-way valve has a compact structure, flexible operation and long service life.

[0028] The utility model also relates to a tractor, comprising the tractor hydraulic trailer brake auxiliary pipeline valve group as described above.

[0029] The beneficial effect of adopting the above further solution is that the utility model also provides a tractor, which has an integrated priority function, electronic pilot control, stable output pressure, and electronic proportional pressure reduction, which can not only achieve synchronous braking of the tractor and the trailer, but also achieve driving braking and parking braking of the trailer under unmanned operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the utility model without the priority function;

[0031] Figure 2 This is a principle diagram of the utility model with priority function.

[0032] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0033] 1. Control valve; 2. Solenoid valve; 3. Oil return line; 4. Oil supply line; 5. Line 1; 6. Line 2; 7. Line 3; 8. Line 4; 9. Line 5; 10. Control line; 11. Pressure sensor; 12. Hydraulic control oil line; 13. Throttle valve; 14. Priority valve; 15. Line 6; 16. Actuator line; 17. LS feedback line; 18. Line 7. DETAILED DESCRIPTION

[0034] 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.

[0035] 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.

[0036] 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.

[0037] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0038] Example 1

[0039] like Figure 1 and Figure 2 As shown, this embodiment provides a tractor hydraulic trailer brake auxiliary pipeline valve group, including a control valve 1 and a solenoid valve 2. The solenoid valve 2 is provided with a first interface, a second interface, and a third interface. The first interface is connected to the second interface or the third interface; the second interface is connected to one end of the oil return line 3, and the third interface is connected to one end of the oil supply line 4.

[0040] The control valve 1 is provided with interface four, interface five and interface six, and the interface four is connected to the interface five or the interface six; the interface one is connected to the pilot chamber at one end of the control valve 1 through pipeline one 5, and the spring interface on the solenoid valve 2 is connected to the pipeline one 5 through pipeline two 6; the interface five is connected to the oil supply pipeline 4 through pipeline three 7, the spring interface on the control valve 1 is connected to the oil return pipeline 3 through pipeline four 8, and the interface six is connected to the pipeline four 8 through pipeline five 9.

[0041] During operation, when the solenoid valve loses power, the solenoid valve core a and the control valve core b are in the lower position under the action of their own internal springs. At this time, the pilot chamber on the upper part of the valve core b is connected to T through pipeline 1 and there is no pressure. The P port is connected to the SL port through pipeline 3. The pressure of the SL port acts on the upper part of the valve core b through the hydraulic control oil circuit and balances with the spring force of the spring in the control valve, ensuring that the output pressure of the SL port is consistent with the spring force;

[0042] When the solenoid valve is energized, the valve core a moves downward under the action of the electromagnetic force, and the pressure at the P port reaches the pilot chamber of the valve core b through pipeline one. At the same time, the pressure is applied to the lower part of the valve core a through pipeline two. At this time, the electromagnetic force is balanced with the pilot force and the spring force of the self-set internal spring. Therefore, the pressure of the pilot chamber can be controlled by adjusting the current of the solenoid valve. The larger the current value, the greater the pilot pressure. At this time, the upper part of the valve core b is affected by the pilot force and SL pressure, and the lower part is affected by the spring force of the spring inside the control valve. The three work together. At this time, the pressure of the SL port is controlled by the pressure of the pilot chamber, that is, the larger the current value, the greater the pilot pressure, and the smaller the pressure at the SL port. When the pilot pressure is greater than the spring force of the spring inside the control valve, the valve core b is completely in the upper position, the SL port is connected to the T port through pipeline four, and the pressure is zero.

[0043] Based on the above scheme, Figure 2 The P pipe and PP pipe in the figure are both oil supply pipes.

[0044] This embodiment integrates a priority function, electronic pilot control, stable output pressure, and electronic proportional pressure reduction, which can achieve synchronous braking of the tractor and trailer, as well as service braking and parking braking of the trailer under unmanned operation.

[0045] Example 2

[0046] On the basis of Example 1, in this embodiment, the interface 4 is connected to one end of the control pipeline 10, and the other end of the control pipeline 10 is used to connect to the actuator.

[0047] This solution has a simple structure and reasonable design. The pressure at the four interfaces acts on the upper part of the valve core b through the control pipeline and balances the spring force of the spring inside the control valve, ensuring that the output pressure of interface four is consistent with the spring force.

[0048] Based on the above solution, the control pipeline 10 is the SL pipeline in the accompanying drawings.

[0049] Example 3

[0050] On the basis of Example 2, in this embodiment, a pressure sensor 11 is fixedly installed on the control pipeline 10 .

[0051] The solution has a simple structure and reasonable design, and uses pressure sensors to monitor the pressure around the interface in real time.

[0052] Example 4

[0053] On the basis of any one of Examples 2 to 3, in this embodiment, the control pipeline 10 is connected to one end of the valve core cavity of the control valve 1 through a hydraulic oil circuit 12 , and a throttle valve 13 is fixedly installed on the hydraulic oil circuit 12 .

[0054] This solution has a simple structure and a reasonable design, and utilizes a hydraulic control oil circuit to control the position of the valve core b of the control valve.

[0055] Example 5

[0056] On the basis of the above embodiments, this embodiment further includes a priority valve 14, on which are provided an interface seven and an interface eight that are connected or disconnected to each other; the interface eight is connected to the oil supply pipeline 4 through the pipeline six 15, and the interface seven is connected to one end of the execution pipeline 16, and the other end of the execution pipeline 16 is used to connect to other execution structures.

[0057] If the system is supplied by a single oil source, in order to ensure the priority of braking, the valve group can be expanded to add a priority function, adding a valve core c, feedback oil port LS, and output oil port AUX. The LS port is connected to the load of the actuator such as the brake, and the AUX port is connected to other actuators.

[0058] When the pump can meet the flow requirements of the AUX port and the brake, the P port pressure pushes the priority valve c through the corresponding oil circuit, the valve core is in the left position, and the pump supplies oil to the AUX and brake at the same time. When the pump cannot meet the flow requirements of the AUX port and the brake, the plunger pump is in a flow saturation state, and the difference between the P port pressure and the LS pressure continues to decrease, △P≈0, the valve core is in the right position under the push of the spring, the P port and the AUX port are disconnected, and the brake is given priority.

[0059] Based on the above solution, the AUX pipeline in the accompanying drawings is the execution pipeline 16.

[0060] Example 6

[0061] On the basis of Example 5, in this embodiment, the spring interface on the priority valve 14 is communicated with one end of the LS feedback line 17 .

[0062] The solution has a simple structure and reasonable design, and utilizes the LS feedback pipeline to feed back relevant signals of the brake.

[0063] Example 7

[0064] On the basis of any one of Examples 5 to 6, in this embodiment, the valve core cavity interface on the priority valve 14 is connected to the pipeline 6 15 through the pipeline 7 18 .

[0065] This solution has a simple structure and a reasonable design. The valve core cavity interface on the priority valve is connected to the pipeline 6 via the pipeline 7 to change the position of the valve core c.

[0066] Example 8

[0067] On the basis of any one of Examples 5 to 7, in this embodiment, the priority valve 14 is a two-position, two-way valve.

[0068] The two-position two-way valve has a simple structure, fast response speed and strong adaptability.

[0069] Example 9

[0070] On the basis of the above embodiments, in this embodiment, the solenoid valve 2 is a two-position three-way proportional solenoid valve, and the control valve 1 is a two-position three-way valve.

[0071] The proportional solenoid valve has a simple structure, high-precision control, fast response and good stability; at the same time, the two-position three-way valve has a compact structure, flexible operation and long service life.

[0072] Example 10

[0073] On the basis of the above embodiments, this embodiment further provides a tractor, comprising the tractor hydraulic trailer brake auxiliary pipeline valve group as described above.

[0074] This embodiment also provides a tractor, which has an integrated priority function, electronic pilot control, stable output pressure, and electronic proportional pressure reduction. It can not only achieve synchronous braking of the tractor and trailer, but also achieve service braking and parking braking of the trailer under unmanned operation.

[0075] The working principle of this utility model is as follows:

[0076] During operation, when the solenoid valve loses power, the solenoid valve core a and the control valve core b are in the lower position under the action of their own internal springs. At this time, the pilot chamber on the upper part of the valve core b is connected to T through pipeline 1 and there is no pressure. The P port is connected to the SL port through pipeline 3. The pressure of the SL port acts on the upper part of the valve core b through the hydraulic control oil circuit and balances with the spring force of the spring in the control valve, ensuring that the output pressure of the SL port is consistent with the spring force;

[0077] When the solenoid valve is energized, the valve core a moves downward under the action of the electromagnetic force, and the pressure at the P port reaches the pilot chamber of the valve core b through pipeline one. At the same time, the pressure is applied to the lower part of the valve core a through pipeline two. At this time, the electromagnetic force is balanced with the pilot force and the spring force of the self-set internal spring. Therefore, the pressure of the pilot chamber can be controlled by adjusting the current of the solenoid valve. The larger the current value, the greater the pilot pressure. At this time, the upper part of the valve core b is affected by the pilot force and SL pressure, and the lower part is affected by the spring force of the spring inside the control valve. The three work together. At this time, the pressure of the SL port is controlled by the pressure of the pilot chamber, that is, the larger the current value, the greater the pilot pressure, and the smaller the pressure at the SL port. When the pilot pressure is greater than the spring force of the spring inside the control valve, the valve core b is completely in the upper position, the SL port is connected to the T port through pipeline four, and the pressure is zero.

[0078] If the system is supplied by a single oil source, in order to ensure the priority of braking, the valve group can be expanded to add a priority function, adding a valve core c, feedback oil port LS, and output oil port AUX. The LS port is connected to the load of the actuator such as the brake, and the AUX port is connected to other actuators.

[0079] When the pump can meet the flow requirements of the AUX port and the brake, the P port pressure pushes the priority valve c through the corresponding oil circuit, the valve core is in the left position, and the pump supplies oil to the AUX and brake at the same time. When the pump cannot meet the flow requirements of the AUX port and the brake, the plunger pump is in a flow saturation state, and the difference between the P port pressure and the LS pressure continues to decrease, △P≈0, the valve core is in the right position under the push of the spring, the P port and the AUX port are disconnected, and the brake is given priority.

[0080] The advantages of the valve group provided by the utility model are as follows:

[0081] 1. Electronic pilot control, stable output pressure;

[0082] 2. Electronically controlled proportional pressure reduction can achieve synchronous braking of the tractor and trailer;

[0083] 3. It can realize the driving brake and parking brake of the trailer without any driver;

[0084] 4. The valve group with priority function is integrated inside, with high integration.

[0085] The protection point of the valve group provided by the present invention lies in the use of pilot-type pressure reducing. The control pressure first passes through the pilot proportional valve a and then acts on the main valve core b. Compared with the previous direct-acting pressure reducing valve, the control pressure directly acts on both ends of the valve core, which can reduce the fluctuation of the output pressure and is more stable. The pilot valve adopts electronic control, and the pedal displacement signal of the service brake can be associated with the solenoid valve SV3, which has a faster response. When hydraulic control is not adopted, the control pressure is reduced due to leakage and pipeline loss. Problems such as unmanned driving can be solved. In addition, for unmanned driving, the current of the solenoid valve can be controlled to achieve synchronous braking of the tractor and trailer under unmanned driving.

[0086] It should be noted that the letters involved in the drawings of the present invention, such as AUX, T, P and PP, have no substantial meanings.

[0087] In addition, 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.

[0088] 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.

[0089] 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.

[0090] 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 hydraulic trailer brake auxiliary pipeline valve group, characterized by: The invention comprises a control valve (1) and a solenoid valve (2), wherein the solenoid valve (2) is provided with a first interface, a second interface and a third interface, wherein the first interface is in communication with the second interface or the third interface; the second interface is in communication with one end of an oil return line (3), and the third interface is in communication with one end of an oil supply line (4); The control valve (1) is provided with a fourth interface, a fifth interface and a sixth interface, wherein the fourth interface is connected to the fifth interface or the sixth interface; the first interface is connected to the pilot chamber at one end of the control valve (1) through the first pipeline (5); the spring interface on the solenoid valve (2) is connected to the first pipeline (5) through the second pipeline (6); the fifth interface is connected to the oil supply pipeline (4) through the third pipeline (7); the spring interface on the control valve (1) is connected to the oil return pipeline (3) through the fourth pipeline (8); the sixth interface is connected to the fourth pipeline (8) through the fifth pipeline (9).

2. The tractor hydraulic trailer brake auxiliary pipeline valve group according to claim 1, characterized in that: The interface 4 is connected to one end of the control pipeline (10), and the other end of the control pipeline (10) is used to connect to the actuator.

3. The tractor hydraulic trailer brake auxiliary pipeline valve group according to claim 2, characterized in that: A pressure sensor (11) is fixedly mounted on the control pipeline (10).

4. The tractor hydraulic trailer brake auxiliary pipeline valve group according to claim 2, characterized in that: The control pipeline (10) is connected to one end of the valve core cavity of the control valve (1) through a hydraulic control oil circuit (12), and a throttle valve (13) is fixedly installed on the hydraulic control oil circuit (12).

5. The tractor hydraulic trailer brake auxiliary pipeline valve group according to any one of claims 1 to 4, characterized in that: The utility model also includes a priority valve (14), wherein the priority valve (14) is provided with an interface 7 and an interface 8 which are connected or disconnected with each other; the interface 8 is connected with the oil supply pipeline (4) through a pipeline 6 (15), and the interface 7 is connected with one end of an execution pipeline (16), and the other end of the execution pipeline (16) is used to connect with other execution structures.

6. The tractor hydraulic trailer brake auxiliary pipeline valve group according to claim 5, characterized in that: The spring interface on the priority valve (14) is communicated with one end of the LS feedback pipeline (17).

7. The tractor hydraulic trailer brake auxiliary pipeline valve group according to claim 5, characterized in that: The valve core cavity interface on the priority valve (14) is connected to the pipeline six (15) through the pipeline seven (18).

8. The tractor hydraulic trailer brake auxiliary pipeline valve group according to claim 5, characterized in that: The priority valve (14) is a two-position, two-way valve.

9. The tractor hydraulic trailer brake auxiliary pipeline valve group according to any one of claims 1 to 4, characterized in that: The solenoid valve (2) is a two-position three-way proportional solenoid valve, and the control valve (1) is a two-position three-way valve.

10. A tractor, characterized in that: The invention comprises a tractor hydraulic trailer brake auxiliary pipeline valve group as described in any one of claims 1 to 9.

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