Filtering system and tractor with same

Abstract

The utility model provides a filtering system and a tractor with the filtering system, and the filtering system comprises a supply oil path, a filtering system, a filtering system and a control system, and the flow inlet end of the supply oil path is communicated with an oil tank of a lubricating system; the flow inlet end of the filtering oil way is communicated with the flow outlet end of the supply oil way, and the flow outlet end of the filtering oil way is communicated with the drive axle oil way; the filtering oil way comprises a first filtering branch and a second filtering branch, the outflow end of the first filtering branch is connected with the outflow end of the second filtering branch to form the outflow end of the filtering oil way, and the filtering precision of the first filtering branch is smaller than that of the second filtering branch. The outflow end of the oil supply path is selectively communicated with the first filter branch or the second filter branch; when the vehicle is in a running state, the filtering oil path is communicated with the first filtering branch; and when the vehicle is in a flameout state, the filtering oil path is communicated with the second filtering branch. By adopting the technical scheme provided by the utility model, the technical problem that the filtering effect of an oil liquid filter in the prior art is poor can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of tractors, in particular to a filtering system and a tractor with the same. Background Art

[0002] At present, in the prior art, in order to ensure that the oil supplied to the drive axle in the lubrication system of the tractor is clean, an oil filtration system is usually set in the oil circuit. The oil filtration system can purify the oil in the lubrication system, thereby ensuring that the oil reaching the drive axle is clean and avoiding damage to the oil circuit in the drive axle.

[0003] However, in the prior art, the filtering effect of the oil filter in the oil filtration system of the tractor is limited. When the tractor continues to work and relative movement occurs between components to generate smaller metal debris, the oil supplied to the drive axle may have low cleanliness due to the insufficient filtering accuracy of the existing filtering system. Utility Model Content

[0004] The main purpose of the utility model is to provide a filtering system and a tractor having the same, so as to solve the technical problem that the filtering effect of the oil filtering system in the prior art is poor.

[0005] In order to achieve the above object, according to one aspect of the utility model, a filtering system is provided, the filtering system is used to filter the oil of the lubrication system of the vehicle, and the filtering system comprises:

[0006] An oil supply circuit, the inlet end of which is connected to an oil tank of a lubrication system;

[0007] A filter oil circuit, wherein the inlet end of the filter oil circuit is connected to the outlet end of the supply oil circuit, and the outlet end of the filter oil circuit is connected to the drive axle oil circuit; the filter oil circuit comprises a first filter branch and a second filter branch, the outlet end of the first filter branch is connected to the outlet end of the second filter branch to form the outlet end of the filter oil circuit, and the filtering accuracy of the first filter branch is less than the filtering accuracy of the second filter branch;

[0008] Among them, the outflow end of the supply oil circuit can be selectively connected to the inflow end of the first filter branch or the inflow end of the second filter branch; when the vehicle is in operation, the filter oil circuit is connected to the first filter branch; when the vehicle is in the off state, the filter oil circuit is connected to the second filter branch.

[0009] Furthermore, the filtering system also includes:

[0010] A switching member is arranged on the filter oil circuit, an inlet end of the switching member is connected to the inlet end of the filter oil circuit, the switching member has a first switching outlet and a second switching outlet, the first switching outlet is connected to the inlet end of the first filter branch, and the second switching outlet is connected to the inlet end of the second filter branch;

[0011] Among them, the switching element has a first conductive state and a second conductive state; when the switching element is in the first conductive state, the inlet end of the switching element is connected to the first switching outlet; when the switching element is in the second conductive state, the inlet end of the switching element is connected to the second switching outlet.

[0012] Furthermore, the filtering system also includes:

[0013] A first filter element is arranged on the first filter branch;

[0014] The second filter element is arranged on the second filter branch, and the filtering accuracy of the second filter element is greater than the filtering accuracy of the first filter element.

[0015] Further, the second filter element is a magnetic filter; and / or,

[0016] The oil suction filter is installed on the oil supply line.

[0017] Further, the filtration system comprises:

[0018] A first driving pump and a second driving pump are both arranged on the oil supply line, the first driving pump is driven by the driving system of the vehicle, and the second driving pump is an electric pump;

[0019] When the vehicle is in a running state, the driving system of the vehicle drives the first driving pump to work; when the vehicle is in an ignition-off state, the second driving pump works.

[0020] Further, the oil supply circuit includes:

[0021] A first oil supply branch, the first oil supply branch has a first oil supply state and a first oil return state, and the first drive pump is arranged on the first oil supply branch;

[0022] A second oil supply branch, two ends of the second oil supply branch are respectively connected to two ends of the first oil supply branch, the second oil supply branch has a second oil supply state and a second oil return state, and the second drive pump is arranged on the second oil supply branch;

[0023] Among them, when the vehicle is in a running state, the first fuel supply branch is in a first fuel supply state, and the second fuel supply branch is in a second fuel return state; when the vehicle is in an off state, the second fuel supply branch is in the second fuel supply state, and the first fuel supply branch is in a first fuel return state.

[0024] Furthermore, the oil supply circuit also includes:

[0025] A first one-way valve is arranged on the first oil supply branch to put the first oil supply branch into a first oil supply state when the vehicle is in operation; and / or,

[0026] The second one-way valve is arranged on the second oil supply branch line, so that the second oil supply branch line is in the second oil supply state when the vehicle is in the ignition-off state.

[0027] Furthermore, the drive axle oil circuit includes a front axle oil circuit and a rear axle oil circuit, the front axle oil circuit is connected to the front drive axle of the vehicle, and the rear axle oil circuit is connected to the rear drive axle of the vehicle; the filtering system also includes:

[0028] The reversing member has a first reversing state, a second reversing state and a third reversing state; when the reversing member is in the first reversing state, the reversing member is connected with the front axle oil circuit; when the reversing member is in the second reversing state, the reversing member is connected with the rear axle oil circuit; when the reversing member is in the third reversing state, both the front axle oil circuit and the rear axle oil circuit are connected with the reversing member.

[0029] Furthermore, the filtering system also includes:

[0030] An oil cooler is arranged between the oil supply circuit and the oil filter circuit, and is used to cool the oil;

[0031] The safety valve is connected to the oil cooler and is used to release the pressure of the oil cooler.

[0032] According to another aspect of the utility model, a tractor is provided, comprising the filtering system provided above.

[0033] By applying the technical solution of the utility model, a second filter branch and a first filter branch are arranged in the filter system, and the filtering accuracy of the second filter branch is made greater than the filtering accuracy of the first filter branch. When the filter system requires high-precision filtration, high-precision filtration can be achieved by connecting the outflow end of the supply oil circuit and the second filter branch. This can meet the demand for high-precision filtration and solve the technical problem of poor filtering effect of the oil filter in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0035] Figure 1 The figure shows a schematic diagram of the flow direction of oil in the oil supply circuit of the filter system provided by the embodiment of the utility model when the vehicle is in operation;

[0036] Figure 2The diagram shows the flow direction of oil in the oil supply circuit of the filter system provided in an embodiment of the utility model when the vehicle is in the ignition-off state.

[0037] The above drawings include the following reference numerals:

[0038] 10. Oil supply circuit; 11. First oil supply branch circuit; 12. Second oil supply branch circuit; 13. First check valve; 14. Second check valve;

[0039] 20. Fuel tank;

[0040] 30. Filter oil circuit; 31. First filter branch; 32. Second filter branch;

[0041] 40. Drive axle oil circuit; 41. Front axle oil circuit; 42. Rear axle oil circuit;

[0042] 50. Switching member; 51. First switching outlet; 52. Second switching outlet;

[0043] 61. first filter element; 62. second filter element; 63. oil suction filter;

[0044] 71. a first driving pump; 72. a second driving pump;

[0045] 80. Oil cooler; 90. Safety valve. DETAILED DESCRIPTION

[0046] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0047] Please refer to Figure 1 and Figure 2 In the first embodiment of the utility model, a filtering system is provided, and the filtering system is used to filter the oil of the lubrication system of the vehicle, and the filtering system includes an oil supply circuit 10 and an oil filter circuit 30. The inlet end of the oil supply circuit 10 is connected to the oil tank 20 of the lubrication system. The inlet end of the oil filter circuit 30 is connected to the outlet end of the oil supply circuit 10, and the outlet end of the oil filter circuit 30 is connected to the drive axle oil circuit 40; the oil filter circuit 30 includes a first filter branch 31 and a second filter branch 32, and the outlet end of the first filter branch 31 is connected to the outlet end of the second filter branch 32 to form the outlet end of the oil filter circuit 30, and the filtering accuracy of the first filter branch 31 is less than the filtering accuracy of the second filter branch 32. Among them, the outflow end of the supply oil circuit 10 can be selectively connected to the inflow end of the first filter branch 31 or the inflow end of the second filter branch 32; when the vehicle is in operation, the filter oil circuit 30 is connected to the first filter branch 31; when the vehicle is in the off state, the filter oil circuit 30 is connected to the second filter branch 32.

[0048] With such a configuration, during the normal operation of the vehicle, the outflow end of the supply oil circuit 10 is connected to the inflow end of the first filter branch 31. In this case, the filtering effect of the first filter branch 31 can achieve the basic filtering requirements for the oil in the lubrication system; and after the vehicle completes the work, the outflow end of the supply oil circuit 10 can be connected to the second filter branch 32 with higher filtering accuracy, so that more effective cleaning can be achieved when the oil flows again and passes through the second filter branch 32, and fine debris in the supply oil circuit 10 can be filtered more effectively to improve the filtering effect. Therefore, the filtering system provided by this embodiment can solve the technical problem of poor filtering effect of oil filters in the prior art.

[0049] It should be noted that the vehicle in this embodiment may be a tractor. Specifically, when the vehicle is working normally, in order to ensure sufficient oil flow and flow rate to match the normal operation of the vehicle, filtering can be performed through the first filter branch 31 with a lower precision; when the vehicle is turned off, since the oil flow and flow rate do not need to be considered, the second filter branch 32 with a higher precision can be used for better filtering, thereby facilitating the filtering of impurities that are not filtered out during normal operation.

[0050] In this embodiment, the filter system further includes a switching member 50. The switching member 50 is disposed on the filter oil circuit 30, and the inlet end of the switching member 50 is connected to the inlet end of the filter oil circuit 30. The switching member 50 has a first switching outlet 51 and a second switching outlet 52. The first switching outlet 51 is connected to the inlet end of the first filter branch 31, and the second switching outlet 52 is connected to the inlet end of the second filter branch 32. The switching member 50 has a first conduction state and a second conduction state. When the switching member 50 is in the first conduction state, the inlet end of the switching member 50 is connected to the first switching outlet 51; when the switching member 50 is in the second conduction state, the inlet end of the switching member 50 is connected to the second switching outlet 52. By adopting such a setting, by respectively arranging a first switching outlet 51 connected to the first filter branch 31 and a second switching outlet 52 connected to the second filter branch 32 on the switching member 50, the supply oil circuit 10 can be connected with the first filter branch 31 or the second filter branch 32, so that the switching of the filtering accuracy in the supply oil circuit 10 can be better realized, the structure is simple, and the switching is reliable.

[0051] Specifically, the filter system further includes a first filter element 61 and a second filter element 62. The first filter element 61 is arranged on the first filter branch 31, and the second filter element 62 is arranged on the second filter branch 32. The filtering accuracy of the second filter element 62 is greater than the filtering accuracy of the first filter element 61. With such an arrangement, the first filter branch 31 and the second filter branch 32 can be filtered respectively by the arrangement of the first filter element 61 and the second filter element 62, thereby meeting the requirements of different filtering accuracies.

[0052] In this embodiment, the second filter element 62 may be a magnetic filter. With such a configuration, the second filter element 62 with a magnetic adsorption function can more effectively adsorb fine metal debris in the oil supply path 10, thereby cleaning the oil supply path 10 more thoroughly.

[0053] Alternatively, the filtering system may further include an oil suction filter 63, which is disposed on the oil supply line 10. With such a configuration, the oil sucked into the oil supply line 10 can be filtered once by the oil suction filter 63, which can further ensure the cleanliness of the oil in the oil supply line 10.

[0054] Alternatively, the second filter element 62 may be configured as a magnetic filter, and an oil suction filter 63 may be configured in the filter system. With such a configuration, the cleaning effect of the oil in the oil supply circuit 10 can be further improved.

[0055] Specifically, the filtration system includes a first drive pump 71 and a second drive pump 72. The first drive pump 71 and the second drive pump 72 are both arranged on the oil supply circuit 10, the first drive pump 71 is driven by the drive system of the vehicle, and the second drive pump 72 is an electric pump. When the vehicle is in a running state, the drive system of the vehicle drives the first drive pump 71 to work; when the vehicle is in a flameout state, the second drive pump 72 works. It should be noted that an electric motor is arranged in the second drive pump 72, and the electric motor is driven by the battery of the tractor or vehicle. With such a setting, since the first drive pump 71 is directly driven by the engine of the tractor or vehicle, when the vehicle is in a flameout state, the engine does not work; at this time, the oil can be pumped by the electrically driven second drive pump 72, and the oil can be pumped when the vehicle is flameout to clean the oil.

[0056] In this embodiment, the oil supply circuit 10 includes a first oil supply branch 11 and a second oil supply branch 12. The first oil supply branch 11 has a first oil supply state and a first oil return state, and the first drive pump 71 is arranged on the first oil supply branch 11. The two ends of the second oil supply branch 12 are respectively connected to the two ends of the first oil supply branch 11, the second oil supply branch 12 has a second oil supply state and a second oil return state, and the second drive pump 72 is arranged on the second oil supply branch 12. Among them, when the vehicle is in the running state, the first oil supply branch 11 is in the first oil supply state, and the second oil supply branch 12 is in the second oil return state; when the vehicle is in the off state, the second oil supply branch 12 is in the second oil supply state, and the first oil supply branch 11 is in the first oil return state. With such an arrangement, since the first drive pump 71 is arranged on the first oil supply branch 11, when the vehicle is in operation, the first drive pump 71 driven by the engine is used to pump the oil through the first oil supply branch 11; and when the vehicle is in an ignition-off state, the second drive pump 72 driven by electricity is used to pump the oil through the second oil supply branch 12. In this way, the two oil circuits can avoid the situation where the engine needs to be started again to pump the oil.

[0057] Specifically, the oil supply circuit 10 may further include a first one-way valve 13, which is arranged on the first oil supply branch 11, so that when the vehicle is in a running state, the first oil supply branch 11 is in a first oil supply state. Alternatively, the supply assembly may further include a second one-way valve 14, which is arranged on the second oil supply branch 12, so that when the vehicle is in a flameout state, the second oil supply branch 12 is in a second oil supply state. Alternatively, the supply assembly may also include the first one-way valve 13 and the second one-way valve 14 at the same time. With such a setting, the return of oil can be blocked by the setting of the first one-way valve 13 and the second one-way valve 14, and the situation that the oil directly returns to the oil tank 20 through the other of the first oil supply branch 11 and the second oil supply branch 12 when one of the first oil supply branch 11 and the second oil supply branch 12 is working can be avoided, and the situation that the oil cannot reach the lubrication position of the drive axle oil circuit 40 or the filter oil circuit 30 can be avoided.

[0058] In this embodiment, the drive axle oil circuit 40 includes a front axle oil circuit 41 and a rear axle oil circuit 42, the front axle oil circuit 41 is connected to the front drive axle of the vehicle, and the rear axle oil circuit 42 is connected to the rear drive axle of the vehicle; the filtering system may also include a reversing member, the reversing member has a first reversing state, a second reversing state and a third reversing state; when the reversing member is in the first reversing state, the reversing member is connected to the front axle oil circuit 41; when the reversing member is in the second reversing state, the reversing member is connected to the rear axle oil circuit 42; when the reversing member is in the third reversing state, the front axle oil circuit 41 and the rear axle oil circuit 42 are both connected to the reversing member. With such a setting, by setting the reversing member, when the vehicle adopts different driving modes (such as front axle drive, rear axle drive or front and rear axle drive), the lubricating oil can be supplied to the front axle oil circuit 41 or the rear axle oil circuit 42, or supplied to the front axle oil circuit 41 and the rear axle oil circuit 42 at the same time, so that the supply of oil can be more adapted to the needs of vehicle driving.

[0059] Specifically, the filtering system further includes an oil cooler 80 and a safety valve 90. The oil cooler 80 is arranged between the oil supply circuit 10 and the filter oil circuit 30, and is used to cool the oil. The safety valve 90 is connected to the oil cooler 80, and is used to release the pressure of the oil cooler 80. With such a setting, the oil cooler 80 can be used to cool the oil, and the safety valve 90 can be used to ensure that the oil will not damage the oil cooler 80 due to excessive pressure when the oil passes through the oil cooler 80.

[0060] In this embodiment, when the vehicle is in operation, the second drive pump 72 is in the closed state, and the switching element 50 is in the right position. When the whole machine is started, the first drive pump 71 delivers the oil in the oil tank 20 to the second one-way valve 14 through the oil suction filter 63, and then connects to the oil cooler 80, and delivers it to the switching element 50 after passing through the oil cooler 80; delivers it to the first one-way valve 13, and closes the first one-way valve 13. At this time, the switching element 50 is in the right position (corresponding to the first conduction state), and the oil is connected to the primary return oil filter (corresponding to the first filter element 61), and the oil is delivered to the front axle oil circuit 41 and the rear axle oil circuit 42 respectively, and then returns the oil to the oil tank 20.

[0061] Specifically, when the vehicle is in a flameout state and electric auxiliary filtering is required, after the whole vehicle is flameout and parked, the switching element 50 is opened to be in the left position, the second driving pump 72 is started, the oil is delivered to the first one-way valve 13, and then reaches the oil cooler 80, and then delivered to the switching element 50; it is delivered to the second one-way valve 14, and the second one-way valve 14 is closed. Because the switching element 50 is in the left position, the oil will be connected to the high-level magnetic return oil filter (corresponding to the second filter element 62), and the filtered oil is respectively delivered to the front axle oil circuit 41 and the rear axle oil circuit 42, and then returned to the oil tank 20. Compared with the primary return oil filter, the high-level magnetic return oil filter not only has high filtering accuracy, but also has magnetic function.

[0062] A tractor is provided in a second embodiment of the present invention, comprising the filtering system provided in the first embodiment.

[0063] From the above description, it can be seen that the above-mentioned embodiments of the utility model achieve the following technical effects: by arranging a first filter branch 31 and a second filter branch 32 with a higher filtering accuracy than the first filter branch 31 in the oil supply circuit 10, a finer filtering effect can be achieved through the second filter branch 32, which can solve the technical problem of poor filtering effect of the oil filter in the prior art.

[0064] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0065] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the application. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0066] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0067] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0068] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0069] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A filtration system, characterized in that: The filtering system is used to filter the oil of the lubrication system of the vehicle, and the filtering system comprises: An oil supply circuit (10), wherein an inlet end of the oil supply circuit (10) is connected to an oil tank (20) of a lubrication system; A filter oil circuit (30), wherein an inlet end of the filter oil circuit (30) is connected to an outlet end of the supply oil circuit (10), and an outlet end of the filter oil circuit (30) is connected to a drive axle oil circuit (40); the filter oil circuit (30) comprises a first filter branch (31) and a second filter branch (32), the outlet end of the first filter branch (31) is connected to an outlet end of the second filter branch (32) to form the outlet end of the filter oil circuit (30), and the filtering accuracy of the first filter branch (31) is smaller than the filtering accuracy of the second filter branch (32); The outlet end of the oil supply circuit (10) can be selectively connected to the inlet end of the first filter branch (31) or the inlet end of the second filter branch (32); when the vehicle is in a running state, the oil filter circuit (30) is connected to the first filter branch (31); when the vehicle is in an ignition-off state, the oil filter circuit (30) is connected to the second filter branch (32).

2. The filtration system according to claim 1, characterized in that: The filtration system further comprises: a switching element (50) disposed on the oil filter circuit (30), wherein an inlet end of the switching element (50) is connected to an inlet end of the oil filter circuit (30), and the switching element (50) has a first switching outlet (51) and a second switching outlet (52), wherein the first switching outlet (51) is connected to an inlet end of the first filter branch circuit (31), and the second switching outlet (52) is connected to an inlet end of the second filter branch circuit (32); The switching element (50) has a first conducting state and a second conducting state; when the switching element (50) is in the first conducting state, the inlet end of the switching element (50) is connected to the first switching outlet (51); when the switching element (50) is in the second conducting state, the inlet end of the switching element (50) is connected to the second switching outlet (52).

3. The filtration system according to claim 1, characterized in that: The filtration system further comprises: A first filter element (61) is arranged on the first filter branch (31); The second filter element (62) is arranged on the second filter branch (32), and the filtering accuracy of the second filter element (62) is greater than the filtering accuracy of the first filter element (61).

4. The filtration system according to claim 3, characterized in that: The second filter element (62) is a magnetic filter; and / or, An oil suction filter (63) is provided on the oil supply passage (10).

5. The filtration system according to claim 1, characterized in that: The filtration system comprises: A first driving pump (71) and a second driving pump (72) are both arranged on the oil supply circuit (10), the first driving pump (71) is driven by the driving system of the vehicle, and the second driving pump (72) is an electric pump; Wherein, when the vehicle is in the running state, the driving system of the vehicle drives the first driving pump (71) to work; when the vehicle is in the ignition-off state, the second driving pump (72) to work.

6. The filtration system according to claim 5, characterized in that: The oil supply circuit (10) comprises: A first oil supply branch (11), the first oil supply branch (11) having a first oil supply state and a first oil return state, the first drive pump being arranged on the first oil supply branch (11); a second oil supply branch (12), wherein two ends of the second oil supply branch (12) are respectively connected to two ends of the first oil supply branch (11), the second oil supply branch (12) has a second oil supply state and a second oil return state, and the second drive pump is arranged on the second oil supply branch (12); Wherein, when the vehicle is in the running state, the first fuel supply branch (11) is in the first fuel supply state, and the second fuel supply branch (12) is in the second fuel return state; when the vehicle is in the shutdown state, the second fuel supply branch (12) is in the second fuel supply state, and the first fuel supply branch (11) is in the first fuel return state.

7. The filtration system according to claim 6, characterized in that: The oil supply circuit (10) further comprises: a first one-way valve (13) disposed on the first fuel supply branch (11) so as to place the first fuel supply branch (11) in the first fuel supply state when the vehicle is in the running state; and / or A second one-way valve (14) is arranged on the second oil supply branch (12) so as to place the second oil supply branch (12) in the second oil supply state when the vehicle is in the ignition-off state.

8. The filtration system according to claim 1, characterized in that: The drive axle oil circuit (40) comprises a front axle oil circuit (41) and a rear axle oil circuit (42), wherein the front axle oil circuit (41) is connected to a front drive axle of the vehicle, and the rear axle oil circuit (42) is connected to a rear drive axle of the vehicle; The filtration system further comprises: A switching element, wherein the switching element has a first switching state, a second switching state and a third switching state; When the reversing element is in the first reversing state, the reversing element is connected to the front axle oil circuit (41); when the reversing element is in the second reversing state, the reversing element is connected to the rear axle oil circuit (42); when the reversing element is in the third reversing state, both the front axle oil circuit (41) and the rear axle oil circuit (42) are connected to the reversing element.

9. The filtration system according to claim 1, characterized in that: The filtration system further comprises: an oil cooler (80), the oil cooler (80) being arranged between the oil supply circuit (10) and the oil filter circuit (30), the oil cooler (80) being used to cool the oil; A safety valve (90) is connected to the oil cooler (80), and the safety valve (90) is used to release the pressure of the oil cooler (80).

10. A tractor, characterized in that: A filtration system comprising any one of claims 1 to 9.

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