Hydraulic system and tractor

Abstract

The application relates to a hydraulic system and a tractor and relates to the technical field of agricultural equipment, and solves the problem that the current tractors mostly use rear multi-way valve systems to control front-mounted tools, resulting in long pipelines and large pressure loss. The hydraulic system comprises a pump body, a priority valve assembly, a steering mechanism, a front-mounted multi-way mechanism and a rear-mounted multi-way mechanism; the output end of the pump body is in communication with the oil inlet end of the priority valve assembly; the first oil outlet end of the priority valve assembly is in communication with the pressure end of the priority valve assembly and the steering mechanism; the second oil outlet end is in communication with the front-mounted multi-way mechanism and the rear-mounted multi-way mechanism; when the priority valve assembly is located at a first position, the oil inlet end of the priority valve assembly is in communication with the first oil outlet end; when the priority valve assembly is located at a second position, the oil inlet end of the priority valve assembly is in communication with the first oil outlet end and the second oil outlet end.

Description

Technical Field

[0001] This application relates to the field of agricultural equipment, and more specifically, to a hydraulic system and a tractor. Background Technology

[0002] With the continuous improvement of agricultural mechanization, tractors, as an important piece of equipment in modern agriculture, are required to have more and more functions.

[0003] Tractors generally use hydraulic oil to control steering, braking, and the movement of front and rear implements. However, most conventional tractors currently lack a front multi-way valve system, typically only having a rear multi-way valve system. Therefore, they can only be equipped with hydraulically controlled implements related to the tractor's rear suspension and rear traction, and cannot accommodate front implements. To accommodate more front implements and increase functionality, hydraulic lines are typically used to route the hydraulic fluid from the rear multi-way valve system to the front of the tractor, supplying fluid to the front multi-way system. However, this method results in longer hydraulic lines, leading to greater pressure loss and higher energy consumption, making it less energy-efficient.

[0004] Therefore, there is an urgent need to provide a hydraulic system and tractor to compensate for the shortcomings of the existing technology to a certain extent. Utility Model Content

[0005] The purpose of this application is to provide a hydraulic system and a tractor that, to a certain extent, solves the problem that most tractors currently use a rear multi-way valve system to control the front implements, resulting in long pipelines and significant pressure loss.

[0006] To achieve the above objectives, the hydraulic system provided by this utility model includes a pump body, a priority valve assembly, a steering mechanism, a front-mounted multi-way mechanism, and a rear-mounted multi-way mechanism. The output end of the pump body is connected to the oil inlet end of the priority valve assembly. The first oil outlet end of the priority valve assembly is connected to both the steering mechanism and the pressure end of the priority valve assembly. The second oil outlet end is connected to both the front-mounted multi-way mechanism and the rear-mounted multi-way mechanism. When the priority valve assembly is in the first position, the oil inlet end of the priority valve assembly is connected to the first oil outlet end. When the priority valve assembly is in the second position, the oil inlet end of the priority valve assembly is simultaneously connected to both the first oil outlet end and the second oil outlet end.

[0007] The priority valve assembly includes a priority valve body and a spring cavity; the spring cavity is located at one end of the priority valve body and is disposed opposite to the pressure end of the priority valve body.

[0008] Specifically, the pump body is provided with a signal feedback interface, and the steering mechanism has a steering oil inlet and a steering signal oil inlet; the oil outlet of the priority valve body is connected to the steering oil inlet, and the steering signal oil inlet is connected to the signal feedback interface of the pump body.

[0009] Furthermore, the steering signal port is connected to one end of the spring cavity of the priority valve body.

[0010] Furthermore, the rear multi-channel mechanism includes a rear oil inlet and a rear signal oil inlet, and the front multi-channel mechanism includes a front oil inlet and a front signal oil inlet; the second oil outlet is connected to the front oil inlet and the rear oil inlet respectively, and the front signal oil inlet and the rear signal oil inlet are both connected to the signal feedback interface.

[0011] Furthermore, the hydraulic system provided by this utility model also includes a first shuttle valve and a second shuttle valve; the front signal port forms a first signal oil circuit with the first end of the first shuttle valve, the rear signal port forms a second signal oil circuit with the second end of the first shuttle valve, a first confluence oil circuit is formed between the third end of the first shuttle valve and the first end of the second shuttle valve, a third signal oil circuit is formed between the steering signal port and the second end of the second shuttle valve, and a second confluence oil circuit is formed between the third end of the second shuttle valve and the signal feedback interface. The hydraulic system provided by this utility model also includes an oil tank, and the oil suction end of the pump body is connected to the oil tank.

[0012] Specifically, the steering mechanism also has a steering return port, which is connected to the oil tank.

[0013] Furthermore, the front multi-channel mechanism has a front oil return port, and the rear multi-channel mechanism has a rear oil return port. Both the front oil return port and the rear oil return port are connected to the oil tank.

[0014] Compared with existing technologies, the hydraulic system provided by this utility model has the following advantages: The hydraulic system provided by this utility model includes a pump body, a priority valve assembly, a steering mechanism, a front-mounted multi-way mechanism, and a rear-mounted multi-way mechanism. The output end of the pump body is connected to the oil inlet end of the priority valve assembly. The first oil outlet end of the priority valve assembly is connected to the steering mechanism and the pressure end of the priority valve assembly, respectively. The second oil outlet end is connected to the front-mounted multi-way mechanism and the rear-mounted multi-way mechanism, respectively. When the priority valve assembly is in the first position, the oil inlet end of the priority valve assembly is connected to the first oil outlet end. When the priority valve assembly is in the second position, the oil inlet end of the priority valve assembly is simultaneously connected to the first oil outlet end and the second oil outlet end.

[0015] Analysis shows that the hydraulic system provided in this application can supply pressurized oil to the steering mechanism, the front multi-way mechanism, and the rear multi-way mechanism through the pump body. By connecting the priority valve assembly to the output end of the pump body, the flow direction of the oil can be controlled. In the hydraulic system provided in this application, by setting the priority valve assembly, the steering mechanism can be given priority in oil supply. That is, when the engine is started, if the steering wheel is not turned, the steering mechanism has no load signal pressure, that is, the steering load signal pressure acting on the spring of the priority valve assembly is 0. Correspondingly, the pressure end of the priority valve assembly will put the priority valve assembly in the second position, so that the oil inlet end of the priority valve assembly is simultaneously connected to the first oil outlet end and the second oil outlet end. When the steering wheel is turned, causing the steering mechanism to require hydraulic fluid, the steering load signal pressure acts on the spring side, reducing the pressure difference between the spring side and the pressure end. The priority valve assembly changes from the second position to the first position, increasing the opening of the first oil outlet and decreasing the opening of the second oil outlet. This prioritizes the steering fluid supply. Correspondingly, excess hydraulic fluid flows to the second oil outlet to supply fluid to the front and rear multi-way mechanisms. In other words, the hydraulic system provided by this application can prioritize the steering mechanism and simultaneously supply fluid to the front and rear multi-way mechanisms. This balances the stroke of the hydraulic fluid reaching the front and rear multi-way mechanisms, thereby avoiding, to some extent, the problem of large pressure loss due to long hydraulic lines.

[0016] In addition, this utility model also provides a tractor including the above-mentioned hydraulic system.

[0017] The tractor using the hydraulic system provided in this application can supply oil to the steering mechanism first, and when the oil supply to the steering mechanism is sufficient, it can also simultaneously supply oil to the front multi-way mechanism and the rear multi-way mechanism. This can make the overall oil circuit layout of the tractor more reasonable to a certain extent, avoid the pressure loss caused by oil flowing in a long oil circuit, avoid the problem of energy waste, and reduce the overall energy consumption of the tractor. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the hydraulic system provided in the embodiment of this application in the state of prioritizing the supply of the steering mechanism.

[0020] Icons: 1-Pump body; 101-Signal feedback interface; 2-Priority valve body; 201-Spring chamber; 3-Steering inlet; 4-Steering return port; 5-Steering signal port; 501-Third signal circuit; 6-Front multi-way mechanism; 601-Forward port; 602-Front return port; 603-Front signal port; 604-First signal circuit; 7-Rear multi-way mechanism; 701-Rear inlet; 702-Rear return port; 703-Rear signal port; 704-Second signal circuit; 8-First shuttle valve; 801-First merging circuit; 9-Second shuttle valve; 901-Second merging circuit; 10-Oil tank. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0022] In the description of this application, it should be noted that the terms "inner" and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this application and for 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. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0023] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "setup" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0024] like Figure 1As shown, the hydraulic system provided in this application includes a pump body 1, a priority valve assembly, a steering mechanism, a front multi-way mechanism 6, and a rear multi-way mechanism 7. The output end of the pump body 1 is connected to the oil inlet end of the priority valve assembly. The first oil outlet end of the priority valve assembly is connected to the steering mechanism and the pressure end of the priority valve assembly, respectively. The second oil outlet end is connected to the front multi-way mechanism 6 and the rear multi-way mechanism 7, respectively. When the priority valve assembly is in the first position, the oil inlet end of the priority valve assembly is connected to the first oil outlet end. When the priority valve assembly is in the second position, the oil inlet end of the priority valve assembly is simultaneously connected to the first oil outlet end and the second oil outlet end.

[0025] Compared with existing technologies, the hydraulic system provided by this utility model has the following advantages: The hydraulic system provided by this utility model includes a pump body 1, a priority valve assembly, a steering mechanism, a front multi-way mechanism 6, and a rear multi-way mechanism 7. The output end of the pump body 1 is connected to the oil inlet end of the priority valve assembly. The first oil outlet end of the priority valve assembly is connected to the steering mechanism and the pressure end of the priority valve assembly, respectively. The second oil outlet end is connected to the front multi-way mechanism 6 and the rear multi-way mechanism 7, respectively. When the priority valve assembly is in the first position, the oil inlet end of the priority valve assembly is connected to the first oil outlet end. When the priority valve assembly is in the second position, the oil inlet end of the priority valve assembly is simultaneously connected to the first oil outlet end and the second oil outlet end.

[0026] Analysis shows that the hydraulic system provided in this application can supply pressurized oil to the steering mechanism, the front multi-way mechanism 6 and the rear multi-way mechanism 7 through the pump body 1. By connecting the priority valve assembly to the output end of the pump body 1, the flow direction of the oil can be controlled. In the hydraulic system provided in this application, by setting the priority valve assembly, the steering mechanism can be given priority in oil supply. That is, when the engine is started, if the steering wheel is not turned, the steering mechanism has no load signal pressure, that is, the steering load signal pressure acting on the spring of the priority valve assembly is 0. Correspondingly, the pressure end of the priority valve assembly will put the priority valve assembly in the second position, so that the oil inlet end of the priority valve assembly is simultaneously connected to the first oil outlet end and the second oil outlet end. When the steering wheel is turned, causing the steering mechanism to require hydraulic fluid, the steering load signal pressure acts on the spring side, reducing the pressure difference between the spring side and the pressure end. The priority valve assembly changes from the second position to the first position, increasing the opening of the first oil outlet and decreasing the opening of the second oil outlet. This prioritizes the steering fluid supply. Correspondingly, excess hydraulic fluid flows to the second oil outlet, providing hydraulic fluid supply to the front multi-way mechanism 6 and the rear multi-way mechanism 7. In other words, the hydraulic system provided by this application can prioritize the steering mechanism and simultaneously supply hydraulic fluid to the front multi-way mechanism 6 and the rear multi-way mechanism 7. This balances the stroke of the hydraulic fluid reaching the front multi-way mechanism 6 and the rear multi-way mechanism 7, thereby avoiding, to some extent, the problem of large pressure loss due to long hydraulic lines.

[0027] Optionally, such as Figure 1 As shown, the priority valve assembly in this application includes a priority valve body 2 and a spring cavity 201; the spring cavity 201 is located at one end of the priority valve body 2 and is disposed opposite to the pressure end of the priority valve body 2.

[0028] The spring chamber 201 is positioned opposite to the pressure end of the priority valve body 2, thereby providing thrust to the priority valve body 2. In this application, the priority valve body 2 is a two-position three-way valve. When in the first position, the inlet end is only connected to the first outlet end, and the oil flows only towards the steering mechanism, thus supplying oil to the steering mechanism. When the steering mechanism's demand is met, the oil acts on the pressure end of the priority valve body 2, causing the priority valve body 2 to change from the first position to the second position. Since the second position of the priority valve body 2 in this application connects the inlet end to both the first and second outlet ends, after the oil flows out, because the steering mechanism's demand is met, the oil flows to the front multi-way mechanism 6 and the rear multi-way mechanism 7, thus supplying oil to the front multi-way mechanism 6 and the rear multi-way mechanism 7.

[0029] Optionally, such as Figure 1 As shown, the pump body 1 in this application is provided with a signal feedback interface 101, and the steering mechanism is formed with a steering oil inlet 3 and a steering signal oil inlet 5; the oil outlet end of the priority valve body 2 is connected to the steering oil inlet 3, and the steering signal oil inlet 5 is connected to the signal feedback interface 101 of the pump body 1.

[0030] The steering mechanism feeds back the pressure demand to the pump body 1 through the steering signal port 5, so that the pump body 1 can output hydraulic oil according to the pressure demand of the steering mechanism, thus ensuring the stable operation of the steering mechanism.

[0031] Preferably, such as Figure 1 As shown, the steering signal port 5 in this application is connected to one end of the spring cavity 201 of the priority valve body 2.

[0032] Since the pump body 1 provided in this application can preferentially supply hydraulic oil to the steering mechanism, by connecting the steering signal oil port 5 to one end of the spring cavity 201 of the priority valve body 2, the priority valve body 2 can be pushed together with the spring cavity 201, so that the priority valve body 2 can change to the first position. When the demand of the priority valve body 2 is met, the pressure at the pressure end of the priority valve body 2 increases, while the pressure at one end of the spring cavity 201 decreases, so that it can be switched to the second position, thereby achieving the purpose of supplying oil to the front multi-way mechanism 6 and the rear multi-way mechanism 7.

[0033] Optionally, such as Figure 1As shown, the rear multiplexing mechanism 7 in this application includes a rear oil inlet 701 and a rear signal oil inlet 703, and the front multiplexing mechanism 6 includes a front oil inlet 601 and a front signal oil inlet 603; the second oil outlet is connected to the front oil inlet 601 and the rear oil inlet 701 respectively, and the front signal oil inlet 603 and the rear signal oil inlet 703 are both connected to the signal feedback interface 101.

[0034] The required pressure oil can be fed back to the signal feedback interface 101 of the pump body 1 through the front signal oil port 603 and the rear signal oil port 703, so that the pump body 1 can accurately output pressure oil and ensure the overall system oil balance.

[0035] Preferably, such as Figure 1 As shown, the hydraulic system provided by this utility model also includes a first shuttle valve 8 and a second shuttle valve 9; a first signal oil passage 604 is formed between the front signal oil port 603 and the first end of the first shuttle valve 8, a second signal oil passage 704 is formed between the rear signal oil port 703 and the second end of the first shuttle valve 8, a first confluence oil passage 801 is formed between the third end of the first shuttle valve 8 and the first end of the second shuttle valve 9, a third signal oil passage 501 is formed between the steering signal oil port 5 and the second end of the second shuttle valve 9, and a second confluence oil passage 901 is formed between the third end of the second shuttle valve 9 and the signal feedback interface 101. This application enables the highest pressure oil state to be fed back to the signal feedback interface 101 through the first shuttle valve 8 and the second shuttle valve 9. That is, the highest oil demand between the front signal oil port 603 and the rear signal oil port 703 can be selected through the first shuttle valve 8, and then the highest oil demand between the second shuttle valve 8 and the steering signal oil port 5 can be selected through the second shuttle valve 9. Finally, the feedback is sent to the signal feedback interface 101 of the pump body 1, so that the pump body 1 can output the oil output pressure that meets the highest demand, thereby ensuring the stability of the overall hydraulic system.

[0036] Optionally, such as Figure 1 As shown, the hydraulic system provided by this utility model also includes an oil tank 10, and the oil suction end of the pump body 1 is connected to the oil tank 10.

[0037] In this application Figure 1 The two oil tanks 10 shown are the same oil tank 10, which can realize the return and output of oil of the whole system.

[0038] Accordingly, such as Figure 1 As shown, the steering mechanism in this application also has a steering return port 4, which is connected to the oil tank 10; the front multi-way mechanism 6 has a front return port 602, and the rear multi-way mechanism 7 has a rear return port 702, both of which are connected to the oil tank 10.

[0039] In addition, this utility model also provides a tractor including the above-mentioned hydraulic system.

[0040] The tractor using the hydraulic system provided in this application can supply oil to the steering mechanism first, and when the oil supply to the steering mechanism is sufficient, it can also simultaneously supply oil to the front multi-path mechanism 6 and the rear multi-path mechanism 7. This can make the overall oil circuit layout of the tractor more reasonable to a certain extent, avoid pressure loss caused by oil flowing in a long oil circuit, avoid energy waste, and reduce the overall energy consumption of the tractor.

[0041] It should be noted that, where there is no conflict, the features in the embodiments of this application can be combined with each other.

[0042] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A hydraulic system, characterized in that, Includes pump body, priority valve assembly, steering mechanism, front multi-way mechanism and rear multi-way mechanism; The output end of the pump body is connected to the oil inlet end of the priority valve assembly. The first oil outlet end of the priority valve assembly is connected to the steering mechanism and the pressure end of the priority valve assembly, respectively. The second oil outlet end is connected to the front multi-way mechanism and the rear multi-way mechanism, respectively. When the priority valve assembly is in the first position, the oil inlet end of the priority valve assembly is connected to the first oil outlet end. When the priority valve assembly is in the second position, the oil inlet end of the priority valve assembly is connected to both the first oil outlet end and the second oil outlet end.

2. The hydraulic system according to claim 1, characterized in that, The priority valve assembly includes a priority valve body and a spring chamber; The spring cavity is located at one end of the priority valve body and is positioned opposite to the pressure end of the priority valve body.

3. The hydraulic system according to claim 2, characterized in that, The pump body is provided with a signal feedback interface, and the steering mechanism has a steering oil inlet and a steering signal oil inlet; The oil outlet of the priority valve body is connected to the steering oil inlet, and the steering signal oil port is connected to the signal feedback interface of the pump body.

4. The hydraulic system according to claim 3, characterized in that, The steering signal port is connected to one end of the spring cavity of the priority valve body.

5. The hydraulic system according to claim 3, characterized in that, The rear multiplexing mechanism includes a rear oil inlet and a rear signal oil inlet, and the front multiplexing mechanism includes a front oil inlet and a front signal oil inlet. The second oil outlet is connected to the inlet and the outlet, respectively, and the inlet and outlet are both connected to the signal feedback interface.

6. The hydraulic system according to claim 5, characterized in that, It also includes a first shuttle valve and a second shuttle valve; The front signal port forms a first signal oil path with the first end of the first shuttle valve, the rear signal port forms a second signal oil path with the second end of the first shuttle valve, the third end of the first shuttle valve and the first end of the second shuttle valve form a first confluence oil path, the steering signal port forms a third signal oil path with the second end of the second shuttle valve, and the third end of the second shuttle valve and the signal feedback interface form a second confluence oil path.

7. The hydraulic system according to claim 1, characterized in that, It also includes an oil tank, and the oil suction end of the pump body is connected to the oil tank.

8. The hydraulic system according to claim 7, characterized in that, The steering mechanism also has a steering return port, which is connected to the oil tank.

9. The hydraulic system according to claim 7, characterized in that, The front multi-channel mechanism has a front oil return port, and the rear multi-channel mechanism has a rear oil return port. Both the front oil return port and the rear oil return port are connected to the oil tank.

10. A tractor, characterized in that, The hydraulic system comprising any one of claims 1-9 above.

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