Transfer case and integrated oil way thereof

Abstract

The utility model only discloses a transfer case and an integrated oil way thereof. The integrated oil way comprises a working oil way and a lubricating oil way which are arranged on a case body, the front side face and the rear side face of the box body are each provided with a shaft hole communicated with the interior of the box body. The lubricating oil way comprises a first oil hole formed in the box body, an oil inlet hole and an oil outlet hole, the lubricating oil way communicates with the shaft hole through the first oil hole. The cooler communicates with the oil inlet through an oil pipe. A valve is mounted at the end part of the first oil hole; the working oil path comprises an oil inlet pipe, an oil outlet pipe and a working oil pipe; the oil pump is communicated with the interior of the box body through an oil inlet pipe, connected with the operating valve through an oil outlet pipe, connected with an oil supply hole in the output shaft through a working oil pipe and communicated with the oil inlet through the cooler, and the oil outlet is communicated with the cooler through the operating valve. By means of the arrangement, the transfer case structure can be simplified, and long oil pipes and complex modeling oil pipes are avoided.

Description

Technical Field

[0001] The utility model relates to the field of hydraulic transmission, in particular to a transfer case and an integrated oil circuit thereof. Background Art

[0002] In the existing transfer cases of the same type, the power cut-off generally adopts a gear sleeve fork structure or a synchronizer structure, which has a relatively complex transmission structure, high operating requirements, large impact, and low comfort; the transfer cases used in the same transmission system field on the market have power waste and insufficient driving force for each power output to work or not work at the same time, and generally do not have a tightening function. In the case of failure of the electro-hydraulic control valve, the transfer case cannot work for power output, and the vehicle can only be towed back, especially when running on water, the failure of the power transmission system causes huge losses and harm, and there are safety hazards; the piston in the wet clutch on the market has no radial limit setting, and there is a risk of piston rotation, resulting in clutch failure and slippage. For the same type of clutch transfer cases, the oil circuit design for the oil circuit system that provides external power source and external fine filter, the external oil pipe is added to the vehicle layout, and the complexity of the oil circuit layout increases, the risk source increases, the use space of the vehicle is reduced, and it is not conducive to the layout of the vehicle structure. Utility Model Content

[0003] In order to solve the problem of complex hydraulic oil circuit layout in the prior art, the purpose of the utility model is to provide a transfer case and an integrated oil circuit thereof, in which the oil circuit is more integrated, the case as a whole is simpler, and the assembly of the whole vehicle is more convenient and refreshing.

[0004] In order to achieve the above-mentioned purpose, the utility model adopts the following technical solutions: an integrated oil circuit, the integrated oil circuit includes a working oil circuit and a lubricating oil circuit arranged on a box body; shaft holes communicating with the interior of the box body are opened on the front and rear sides of the box body, the shaft holes include a transmission shaft hole and a clutch shaft hole, the end of the transmission shaft is rotatably installed in the transmission shaft hole through a bearing, the output shaft is rotatably installed in the clutch shaft hole through a bearing, the clutch is installed on the output shaft, and an oil supply hole for supplying oil to the clutch is opened on the output shaft; an oil rib is arranged in the box body, and the two ends of the oil rib are connected to the front and rear sides of the box body;

[0005] The lubricating oil circuit includes a first oil hole, a second oil hole, an oil inlet hole and an oil outlet hole; the first oil hole is opened on the front side and the rear side of the box body, the second oil hole is arranged in the oil rib, the two ends of the second oil hole are respectively connected with the front and rear first oil holes, the third oil hole is arranged on the side of the box body, the first oil hole and the shaft hole are connected through the third oil hole, the oil inlet hole and the oil outlet hole are arranged on the box body, the oil inlet hole and the oil outlet hole are both connected with the first oil hole, and the cooler is connected with the oil inlet hole through the oil pipe; a valve is installed at the end of the first oil hole;

[0006] The working oil circuit includes an oil inlet pipe, an oil outlet pipe and a working oil pipe; the oil pump is connected to the inside of the box through the oil inlet pipe, the oil pump is connected to the control valve through the oil outlet pipe, the control valve is connected to the oil supply hole on the output shaft through the working oil pipe, the control valve is connected to the oil inlet hole through the cooler, and the oil outlet hole is connected to the cooler through the control valve.

[0007] Preferably, the oil pump is arranged on the oil inlet pipe, and the oil inlet pipe and the oil outlet pipe are connected through a fine filter.

[0008] Preferably, two lubricating oil circuits are arranged on both sides of the box body, the two lubricating oil circuits are connected through a connecting pipe, the oil inlet of one lubricating oil circuit is connected to the cooler through an oil pipe, and the oil outlet of the other lubricating oil circuit is connected to the control valve.

[0009] Preferably, an oil outlet hole is opened on the first oil hole, and the oil outlet hole can be connected with the shaft hole through the oil hole.

[0010] Preferably, the valve comprises a hydraulic safety valve, which is used to control the oil pressure in the lubricating oil circuit.

[0011] Preferably, the lubricating oil circuit is arranged at the top of the box body.

[0012] Preferably, the box body is an integral box body.

[0013] Preferably, the oil pump and the control valve are both installed on the box body.

[0014] A transfer case comprises the above-mentioned integrated oil circuit.

[0015] Preferably, the transmission shaft includes an input shaft, an intermediate shaft and an oil pump power take-off shaft; the output shaft includes a first output shaft and a second output shaft; one end of the input shaft is rotatably connected to one end of the first output shaft, and the input shaft and the first output shaft are transmission connected via a first clutch; the input shaft and the intermediate shaft are transmission via gear meshing, the intermediate shaft and the second output shaft are transmission via gear meshing, and the second output shaft and the oil pump power take-off shaft are transmission via gear meshing; wherein an output gear is rotatably mounted on the second output shaft, and the output gear and the second output shaft are transmission connected via a second clutch.

[0016] The beneficial effects of the technical solution of the utility model are as follows: by setting oil holes on the box body, the flow of lubricating oil does not require external oil pipes, thereby simplifying the transfer case structure; and the hydraulic oil used to control the operation of the clutch only needs to be distributed through the operating components, thereby avoiding long oil pipes and complex oil pipes; the oil is transported to each working point through various pipelines and internal oil circuits, and only two oil pipes are needed to connect the transfer case and the cooler on the whole vehicle, reducing the complexity of the vehicle oil system and reducing risk points, thereby improving the reliability of the oil system. In the above structure, the power of the oil pump is taken from the transfer case, and the oil pump and the second output shaft work together, thereby ensuring the effectiveness of bearing lubrication. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of the transfer case structure Figure 1 ;

[0018] Figure 2 Schematic diagram of the transfer case structure Figure 2 ;

[0019] Figure 3 The structure of the box is shown in Figure 1. Figure 1 ;

[0020] Figure 4 for Figure 3 Middle AA section view;

[0021] Figure 5 The structure of the box is shown in Figure 1. Figure 2 ;

[0022] Figure 6 is a schematic diagram of the structure of the clutch;

[0023] Figure 7 It is a schematic diagram of the structure of the piston;

[0024] Figure 8 It is a schematic diagram of the structure of the operating components;

[0025] Fig. 9 This is a schematic diagram of the transfer case lubrication oil circuit.

[0026] Figure numerals: 1, housing; 2, first housing; 3, second housing; 4, oil pump; 5, high elastic coupling; 6, input shaft; 7, input gear; 8, first clutch; 9, speed measuring gear; 10, first output shaft; 11, first output flange; 12, needle bearing; 13, first spline seat; 14, intermediate shaft; 15, intermediate gear; 16, output gear; 17, second output shaft; 19, second clutch; 20, second output flange; 21, oil pump power take-off shaft; 22, oil pump gear; 23, control valve; 24, clutch housing; 25, piston; 26, wet friction plate; 27, pressure plate; 28, return spring; 29, retaining ring seat; 30, retaining ring; 31, outer friction plate; 32, control valve; 33, fine filter; 100, working oil pipe; 101, oil rib; 102, oil outlet pipe; 1000, shaft hole; 1001, oil rib; 1002, first oil hole; 1003, second oil hole; 1004, third oil hole; 1005, valve; 1006, oil distribution hole; 1007, oil inlet hole. DETAILED DESCRIPTION

[0027] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0028] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "clockwise", "counterclockwise" 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 should not be understood as a limitation on the present invention.

[0029] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "plurality" means two or more, unless otherwise clearly defined.

[0030] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature. Example

[0032] like Figures 1 to 3 The transfer case shown includes an integral case body, in which an input component II, an output component III, an intermediate shaft component IV, an oil pump power take-off component V and an operating component VI are installed.

[0033] The input component II includes a high elastic coupling 5, an input shaft 6, an input gear 7, a first clutch 8, a speed measuring gear 9 and a first output shaft 10. The input shaft 6 and the first output shaft 10 are both rotatably mounted on the housing 1. The input shaft 6 and the first output shaft 10 are rotatably connected. One end of the input shaft 6 extends out of the housing 1, and the end of the input shaft 6 is connected to the high elastic coupling 5. One end of the first output shaft 10 extends out of the housing 1, and a first output flange 11 is installed on the first output shaft 10. The input shaft 6 and the first output shaft 10 are connected by transmission through the first clutch 8. A first cover 2 is fixed on the outer surface of the housing 1, and the high elastic coupling 5 is located in the first cover 2.

[0034] The output component III includes a second output shaft 17, an output gear 16, a second clutch 19 and a second output flange 20; the second output shaft 17 is rotatably mounted on the housing 1, the output gear 16 is rotatably mounted on the second output shaft 17, the second output shaft 17 and the output gear 16 are transmission-connected via the second clutch 19, a second housing 3 is fixed on the outer surface of the housing 1, one end of the second output shaft 17 extends into the second housing 3 and is fixedly mounted with a second output flange 20;

[0035] The intermediate shaft component IV comprises an intermediate shaft 14 and an intermediate gear 15; the intermediate shaft 14 is rotatably mounted on the housing 1, and the intermediate gear 15 is fixed on the intermediate shaft 14;

[0036] The oil pump power take-off component V comprises an oil pump power take-off shaft 21 and an oil pump gear 22 ; the oil pump power take-off shaft 21 is rotatably mounted on the housing 1 , the oil pump gear 22 is fixed on the oil pump power take-off shaft 21 , and the oil pump power take-off shaft 21 is transmission-connected to the oil pump 4 .

[0037] The input gear 7 and the intermediate gear 15 are meshed for transmission, the intermediate gear 15 and the output gear 16 are meshed for transmission, and the output gear 16 and the oil pump gear 22 are meshed for transmission.

[0038] With such an arrangement, the transfer case can achieve a one-in-three-out power layout.

[0039] In this embodiment, Figure 1 As shown, a middle connecting groove is provided at the end of the input shaft 6, a first spline seat 13 is fixed in the connecting groove, and the end of the first output shaft is connected to the first spline seat 13. Such an arrangement facilitates the connection between the input shaft and the first output shaft, and facilitates the assembly of the transfer case.

[0040] In this embodiment, Figure 1As shown, a speed measuring gear 9 is mounted on the first output shaft 10, and a sensor for measuring the rotation speed of the speed measuring gear 9 is mounted in the housing 1. Further preferably, the input shaft 6 and the first output shaft 10 are rotatably connected via a needle bearing 12.

[0041] In this embodiment, Figure 1 As shown, the first clutch 8 and the second clutch 19 have the same structure; Figure 6 As shown, the second clutch 19 includes a clutch housing 24, a piston 25, a wet friction plate 26, a pressure plate 27, a return spring 28, a retaining ring seat 29, a retaining ring 30 and an outer friction plate 31; an annular connecting portion is protruded on the second output shaft 17, the clutch housing 24 is fixed on the connecting portion, and the piston is slidably mounted on the second output shaft 17; a second spline seat is protruded on the output gear 16, and the second spline seat extends into the clutch housing 24, a plurality of wet friction plates 26 and a plurality of outer friction plates 31 are arranged at intervals, the wet friction plates 26 and the outer friction plates 31 are located in the clutch housing 24, the wet friction plates 26 and the outer friction plates 31 are sleeved on the second spline seat, and the wet friction plates 26 are spline-connected to the second spline seat The outer friction plate and the inner wall of the clutch housing 24 are splinedly connected; the pressure plate 27 is arranged in the clutch housing 24, and the wet friction plate 26 and the outer friction plate 31 are located between the pressure plate 27 and the piston 25; the return spring 28, the retaining ring seat 29 and the retaining ring 30 are all sleeved on the second output shaft 17, the return spring 28, the retaining ring seat 29 and the retaining ring 30 are located on the inner side of the second spline seat, the retaining ring 30 is fixed on the second output shaft 17, the return spring 28 and the retaining ring seat 29 are located between the retaining ring 30 and the piston 25, and the two ends of the piston 25 are respectively against the retaining ring seat 29 and the piston 25; a piston cavity is provided between the piston 25 and the connecting part, and a working oil hole is opened on the second output shaft 17, and the working oil hole is connected to the piston cavity.

[0042] In this arrangement, the piston 25 is pushed by the return spring 28 to ensure that there is a gap in the friction plate when the wet clutch is not working, thereby reducing the displacement torque of the wet clutch; a specially designed retaining ring seat 29 is used to prevent the retaining ring 30 from escaping when it is subjected to the spring force of the return spring 28.

[0043] Further preferably, Figure 7 As shown, the outer ring of the piston 25 is convex with external teeth, and the clutch housing 24 is slidably matched with the external teeth of the piston. Such an arrangement can effectively prevent the piston from rotating and can effectively prevent the clutch from failing and slipping.

[0044] In this embodiment, Figure 8As shown, the operating component VI includes an operating valve 23 installed on the housing 1, and the operating valve 23 can control the on and off of multiple oil channels. Furthermore, an emergency device 34 is also included on the operating valve 23. The emergency device 34 is used to ensure that the pressure oil can smoothly enter the first clutch 8 and the second clutch 19 when the operating valve 23 fails, so that the transfer case can work normally.

[0045] An integrated oil circuit applied to the above transfer case, the integrated oil circuit includes a working oil circuit and a lubricating oil circuit arranged on the case body 1; Figure 3 As shown, the front and rear sides of the housing 1 are provided with shaft holes 1000 connected to the interior thereof, and the shaft holes 1000 include a transmission shaft hole and a clutch shaft hole. Figure 1 and Figure 2 As shown, the end of the transmission shaft is rotatably mounted in the transmission shaft hole through a bearing, the output shaft is rotatably mounted in the clutch shaft hole through a bearing, the clutch is mounted on the output shaft, and an oil supply hole for supplying oil to the clutch is opened on the output shaft; Figure 4 As shown, an oil-passing rib 1001 is provided in the box body 1, and the two ends of the oil-passing rib 1001 are connected to the front and rear sides of the box body 1;

[0046] like Figure 4 and Figure 5 As shown, the lubricating oil circuit includes a first oil hole 1002, a second oil hole 1003, an oil inlet hole 1007 and an oil outlet hole 1008; the first oil hole 1002 is opened on the front side and the rear side of the housing 1, the second oil hole 1003 is arranged in the oil rib 1001, the two ends of the second oil hole 1003 are respectively connected with the front and rear first oil holes 1002, the third oil hole 1004 is arranged on the side of the housing 1, the first oil hole 1002 and the shaft hole 1000 are connected through the third oil hole 1004, the oil inlet hole 1007 and the oil outlet hole 1008 are arranged on the housing 1, the oil inlet hole 1007 and the oil outlet hole 1008 are both connected with the first oil hole 1002, and the cooler is connected with the oil inlet hole 1007 through an oil pipe; a valve 1005 is installed at the end of the first oil hole 1002;

[0047] like Figure 2 As shown, the working oil circuit includes an oil inlet pipe 101, an oil outlet pipe 102 and a working oil pipe 100; the oil pump 4 is connected to the interior of the casing 1 through the oil inlet pipe 101, the oil pump 4 is connected to the control valve 23 through the oil outlet pipe 102, the control valve 23 is connected to the oil supply hole on the output shaft through the working oil pipe 100, the control valve 32 is connected to the oil inlet hole 1007 through the cooler 33, and the oil outlet hole 1008 is connected to the cooler 33 through the control valve 32.

[0048] In this way, by setting oil holes on the housing 1, the flow of lubricating oil does not require external oil pipes, thereby simplifying the transfer case structure; and the hydraulic oil used to control the operation of the clutch only needs to be distributed through the operating components, thereby avoiding long oil pipes and complex oil pipes; the oil is transported to each working point through various pipelines and internal oil circuits, and only two oil pipes are needed to connect the transfer case and the cooler on the whole vehicle, which reduces the complexity of the vehicle oil circuit system and reduces risk points, thereby improving the reliability of the oil circuit system. In the above structure, the power of the oil pump is taken from the transfer case, and the oil pump and the second output shaft work together, thereby ensuring the effectiveness of bearing lubrication. The lubricating oil circuit is mainly integrated with the housing, and each bearing and gear working place is forced to lubricate to prevent abnormal operation of the transfer case caused by excessive lubricating oil pressure.

[0049] In this embodiment, the oil pump 4 is arranged on the oil inlet pipe 101, and the oil inlet pipe 101 and the oil outlet pipe 102 are connected through the fine filter 32. With such arrangement, the high integration of the transfer case is reflected in that the transfer case sucks oil through the oil pump 4, then filters it through the fine filter 32, and transports the oil to various working points through various pipelines and internal oil circuits.

[0050] In this embodiment, two lubricating oil circuits are arranged on both sides of the box body 1, and the two lubricating oil circuits are connected through a connecting pipe 1009. The oil inlet hole 1007 of one lubricating oil circuit is connected to the cooler 33 through an oil pipe, and the oil outlet hole 1008 of the other lubricating oil circuit is connected to the control valve 23.

[0051] In this embodiment, an oil distribution hole 1006 is opened on the first oil hole 1002, and the oil distribution hole 1006 can supply oil to the shaft hole 1000 through an oil pipe.

[0052] In this embodiment, valve 1005 includes a hydraulic safety valve, which is used to control the lubricating oil circuit. In this configuration, a safety valve is designed in the lubricating oil circuit to prevent the transfer case from working abnormally due to excessive lubricating oil pressure.

[0053] In this embodiment, the housing 1 is composed of an integral housing 1, and the lubricating oil circuit is arranged at the top of the housing 1; the oil pump 4 and the control valve 23 are both installed on the housing 1, wherein the control valve is installed at the top of the housing, and the oil pump and the fine filter are both installed at the side of the housing. Such an arrangement makes the structure of the transfer case more compact.

[0054] When the control valve 23 controls the first clutch 8 to engage, power is input from the high elastic coupling 5 and passes through the input shaft 6, the first clutch 8, the first output shaft 10 and the first output flange 11 in sequence, which is the first power output path;

[0055] When the control valve 23 controls the second clutch 19 to engage, the power is input from the high elastic coupling 5 and passes through the input shaft 6, the input gear 7, the intermediate gear 15, the output gear 16, the second clutch 19, the second output shaft and the output flange 20 in sequence, which is the second power output path;

[0056] In the above power transmission process, the power drives the oil pump 4 through the input shaft 6, the input gear 7, the intermediate gear 15, the output gear 16, the oil pump gear 22 and the oil pump power take-off shaft 21 in sequence, thereby providing power for the oil circuit system and making the transfer case work.

[0057] The control valve 23 controls the K1 clutch 8 and the K2 clutch 19 to combine power to achieve one-input and two-output power output.

[0058] like Figure 2 and Fig. 9 As shown, when the transfer case has power input, the oil pump starts synchronously, and the oil pump draws out the oil at the bottom of the case through the oil inlet pipe 101. The oil pump 4 sends the oil to the fine filter 32, and then sends it to the control valve 33 through the oil outlet pipe 102. The control valve controls the oil to enter the first clutch 8 and / or the second clutch 19 through the working oil pipe 100. The oil enters the clutch piston cavity through the clutch shaft hole in the output shaft. The oil entering the piston cavity pushes the piston to move axially. The movement of the piston drives the outer friction plate and the wet friction plate to combine, so that the power is transmitted to the output shaft through the clutch.

[0059] like Fig. 9 As shown, the transfer case sucks oil through the oil pump 4, and then enters the control valve 33 after being filtered by the fine filter 32. The oil passes through the control valve in sequence through the cooler 33, the oil inlet hole 1007, the first oil hole 1002 and the second oil hole 1003, and then passes through the third oil hole 1004 to lubricate and dissipate heat for the bearings and gears.

[0060] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0061] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and purpose of the present invention.

Claims

1. An integrated oil circuit, characterized in that: The integrated oil circuit comprises a working oil circuit and a lubricating oil circuit arranged on the housing (1); shaft holes (1000) communicating with the interior of the housing (1) are provided on both the front and rear sides of the housing (1); the shaft holes (1000) comprise a transmission shaft hole and a clutch shaft hole; the end of the transmission shaft is rotatably mounted in the transmission shaft hole (1000) via a bearing; the output shaft is rotatably mounted in the clutch shaft hole (1000) via a bearing; the clutch is mounted on the output shaft; and an oil supply hole for supplying oil to the clutch is provided on the output shaft; an oil rib (1001) is provided in the housing (1); both ends of the oil rib (1001) are connected to the front and rear sides of the housing (1); The lubricating oil circuit comprises a first oil hole (1002), a second oil hole (1003), an oil inlet hole (1007) and an oil outlet hole (1008); the first oil hole (1002) is provided on the front side and the rear side of the box body (1); the second oil hole (1003) is provided in the oil rib (1001); the two ends of the second oil hole (1003) are respectively connected to the front and rear first oil holes (1002); the third oil hole (1004) is provided on the box body ( 1), the first oil hole (1002) and the shaft hole (1000) are connected via a third oil hole (1004); an oil inlet hole (1007) and an oil outlet hole (1008) are arranged on the housing (1); the oil inlet hole (1007) and the oil outlet hole (1008) are both connected to the first oil hole (1002); the cooler is connected to the oil inlet hole (1007) via an oil pipe; a valve (1005) is installed at the end of the first oil hole (1002); The working oil circuit comprises an oil inlet pipe (101), an oil outlet pipe (102) and a working oil pipe (100); the oil pump (4) is connected to the interior of the casing (1) via the oil inlet pipe (101); the oil pump (4) is connected to the control valve (23) via the oil outlet pipe (102); the control valve (23) is connected to the oil supply hole on the output shaft via the working oil pipe (100); the control valve (23) is connected to the oil inlet hole (1007) via the cooler (33); and the oil outlet hole (1008) is connected to the cooler (33) via the control valve (23).

2. An integrated oil circuit according to claim 1, characterized in that: The oil pump (4) is arranged on the oil inlet pipe (101), and the oil inlet pipe (101) and the oil outlet pipe (102) are connected via a fine filter (32).

3. The integrated oil circuit according to claim 1, characterized in that: Two lubricating oil circuits are arranged on both sides of the box body (1), and the two lubricating oil circuits are connected through a connecting pipe (1009). The oil inlet hole (1007) of one lubricating oil circuit is connected to the cooler (33) through an oil pipe, and the oil outlet hole (1008) of the other lubricating oil circuit is connected to the control valve (23).

4. The integrated oil circuit according to claim 1, characterized in that: An oil distribution hole (1006) is provided on the first oil hole (1002), and the oil distribution hole (1006) can supply oil to the shaft hole (1000) through an oil pipe.

5. The integrated oil circuit according to claim 1, characterized in that: The valve (1005) comprises a hydraulic safety valve, which is used to control the oil pressure in the lubricating oil circuit.

6. The integrated oil circuit according to claim 1, characterized in that: The lubrication oil circuit is arranged on the top of the box body (1).

7. The integrated oil circuit according to claim 1, characterized in that: The box body (1) is an integral box body.

8. The integrated oil circuit according to claim 1, characterized in that: The oil pump (4) and the control valve (23) are both mounted on the housing (1).

9. A transfer case, characterized in that: Comprising the integrated oil circuit described in any one of claims 1 to 8 above.

10. A transfer case according to claim 9, characterized in that: The transmission shaft comprises an input shaft (6), an intermediate shaft (14) and an oil pump power take-off shaft (21); the output shaft comprises a first output shaft (10) and a second output shaft (17); One end of the input shaft (6) is rotatably connected to one end of the first output shaft (10), and the input shaft (6) and the first output shaft (10) are transmission-connected via a first clutch; The input shaft (6) and the intermediate shaft (14) are driven by gear meshing, the intermediate shaft (14) and the second output shaft (17) are driven by gear meshing, and the second output shaft (17) and the oil pump power take-off shaft (21) are driven by gear meshing; wherein an output gear is rotatably mounted on the second output shaft (17), and the output gear and the second output shaft (17) are connected by a second clutch.

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