Lateral power take-off device and vehicle power system

Abstract

The invention relates to the technical field of power systems, and discloses a side-mounted power take-off device and a vehicle power system.The side-mounted power take-off device is characterized in that a transmission shaft is arranged on one radial side of a driving shaft and is parallel to the driving shaft, and a second gear, the transmission shaft and a pressurizing impeller are arranged in the space on one radial side of the driving shaft; the purpose of reducing the occupied space of the driving shaft in the axial direction is achieved, and the occupied space of the side power take-off device in the axial direction of the driving shaft is reduced. The pressurizing impeller is fixed to the transmission shaft, inlet oil of the pressurizing pump is pressurized through the pressurizing impeller, efficient oil suction of the pressurizing pump is guaranteed, and the cavitation phenomenon caused by insufficient oil inlet pressure of the pressurizing pump can be effectively avoided. The transmission shaft not only has the effect of taking power from the transmission shaft in cooperation with the first gear and the second gear, but also can be matched with the pressurizing impeller to pressurize inlet oil of the pressurizing pump, the transmission shaft has the two functions, independent power does not need to be additionally arranged for the pressurizing impeller, a vehicle power system is simplified, and energy consumption is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power system, in particular to a side-mounted power take-off device and a vehicle power system. BACKGROUND

[0002] In a truck, crane, tractor and other vehicles, a power transmission device obtains power from an engine to drive a plunger pump. In order to meet the power requirements of other components, a side-mounted power take-off device is generally used to take power from the power transmission device to drive the components.

[0003] In order to meet the lubrication requirements of the power transmission device, a booster impeller is generally sleeved on the input shaft of the power transmission device to stir the lubricating oil in the housing by rotating the booster impeller to lubricate the meshing gears in the power transmission device.

[0004] However, the arrangement of the booster impeller increases the axial space occupied by the power transmission device along the input shaft. SUMMARY

[0005] The present application aims to provide a side-mounted power take-off device and a vehicle power system to meet the requirements of boosting the inlet oil pressure of the booster pump while reducing the axial space occupied by the side-mounted power take-off device.

[0006] In one aspect, the present application provides a side-mounted power take-off device, which comprises:

[0007] a housing;

[0008] a drive shaft, both ends of which are rotatably mounted to the housing, the input end of the drive shaft being used to connect a driving member, the drive shaft being used to drive a booster pump to work; the drive shaft is fixed with a first gear located in the housing;

[0009] a transmission shaft located on one side of the drive shaft and parallel to the drive shaft, both ends of the transmission shaft being rotatably mounted to the housing, the transmission shaft being fixed with a second gear located in the housing, the second gear being in transmission connection with the first gear, at least one end of the transmission shaft forming a power take-off end;

[0010] a booster impeller fixed to the transmission shaft, the housing being provided with an oil supply channel and an oil suction port in communication with the inlet end of the booster impeller, the inlet end of the oil supply channel being in communication with the outlet end of the booster impeller, and the outlet end of the oil supply channel being used to communicate with the oil inlet of the booster pump.

[0011] The side-mounted power take-off device provided by the present application has at least the following beneficial effects:

[0012] The side-mounted power take-off device provided by the application has the following advantages: when the driving member works, the driving shaft rotates to drive the input shaft of the supercharging pump to rotate, so that the supercharging pump supercharges the oil; at the same time, the driving shaft drives the first gear to rotate, the first gear transmits power to the second gear, the second gear drives the transmission shaft on which the second gear is located to rotate, so that the transmission shaft transmits power to the structure connected to the power take-off end of the transmission shaft, thereby achieving power output. Since the transmission shaft is located on the radial side of the driving shaft and is parallel to the driving shaft, the second gear, the transmission shaft and the supercharging impeller are arranged on the radial side of the driving shaft, thereby reducing the axial space occupied by the driving shaft and reducing the axial space occupied by the side-mounted power take-off device.

[0013] Since the supercharging impeller is fixed to the transmission shaft, the shell is provided with an oil supply channel and an oil suction port in communication with the inlet end of the supercharging impeller, the inlet end of the oil supply channel is in communication with the outlet end of the supercharging impeller, and the outlet end of the oil supply channel is used to communicate with the oil inlet of the supercharging pump. When the transmission shaft rotates, the supercharging impeller rotates synchronously with the transmission shaft, the oil enters the inlet end of the supercharging impeller through the oil suction port, and the oil in the inlet end of the supercharging impeller is thrown out of the outlet end of the supercharging impeller in the radial direction of the supercharging impeller under the centrifugal force of the rotation of the supercharging impeller. This centrifugal force causes the oil to be supercharged once, and the supercharged oil is thrown into the oil supply channel, and the oil in the oil supply channel is sucked into the inlet of the supercharging pump and output after being supercharged twice by the supercharging pump. By supercharging the oil in the inlet of the supercharging pump through the supercharging impeller, the efficient oil suction of the supercharging pump is ensured, and the cavitation phenomenon caused by insufficient oil pressure in the inlet of the supercharging pump is effectively solved.

[0014] The transmission shaft not only has the function of taking power from the transmission shaft by cooperating with the first gear and the second gear, but also can supercharge the oil in the inlet of the supercharging pump by cooperating with the supercharging impeller. The transmission shaft has both functions, and does not need to be provided with an independent power source for the supercharging impeller, thereby simplifying the vehicle power system and reducing energy consumption.

[0015] As an implementable scheme of the above-mentioned side-mounted power take-off device, the shell is provided with an oil separation structure, the oil separation structure is sealingly connected to the shell to form a supercharging cavity, the supercharging impeller is arranged in the supercharging cavity, and the second gear and the first gear are arranged outside the supercharging cavity.

[0016] As an implementable scheme of the above-mentioned side-mounted power take-off device, the side-mounted power take-off device further comprises the following components located in the shell:

[0017] A third gear, the third gear is engaged with the first gear and the second gear;

[0018] An intermediate shaft is fixed to the housing, and the third gear is rotatably sleeved outside the intermediate shaft; or the intermediate shaft is rotatably installed on the housing, and the third gear is fixedly sleeved outside the intermediate shaft.

[0019] As an implementable solution of the side-mounted power take-off device, the third gear is located outside the plenum.

[0020] As an implementable solution of the side-mounted power take-off device, the plenum impeller is installed on the second gear through a plurality of fasteners distributed along the circumference of the plenum impeller.

[0021] As an implementable solution of the side-mounted power take-off device, the drive shaft includes two coaxially arranged drive sub-shafts connected through a spline shaft.

[0022] The plenum pump is provided with two, one of the drive sub-shafts is used for connecting a driving member and one of the plenum pumps, and the other drive sub-shaft is used for connecting the other plenum pump.

[0023] As an implementable solution of the side-mounted power take-off device, the first gear is fixedly sleeved outside the spline shaft.

[0024] As an implementable solution of the side-mounted power take-off device, the oil supply channel includes:

[0025] A first oil passage, one end of the first oil passage being in communication with an oil outlet end of the plenum impeller;

[0026] Two second oil passages corresponding to the two plenum pumps, one end of the second oil passage being in communication with the other end of the first oil passage, and the other end being used for being in communication with an oil inlet of the corresponding plenum pump.

[0027] In another aspect, the present application provides a vehicle power system including a plenum pump, a driving member and a side-mounted power take-off device according to any one of the above solutions, the drive shaft being connected with an input shaft of the plenum pump, an oil inlet of the plenum pump being in communication with an outlet end of the oil supply channel, and an output end of the driving member being connected with an input end of the drive shaft.

[0028] The vehicle power system provided by the present application has at least the following beneficial effects:

[0029] The vehicle power system includes the above side-mounted power take-off device, and through adoption of the above side-mounted power take-off device, the axial space occupied by the side-mounted power take-off device can be reduced while meeting the requirement of pressurizing the oil pressure at the inlet of the plenum pump.

[0030] As one possible implementation of the aforementioned vehicle power system, two booster pumps are provided, and the two booster pumps are respectively connected to both ends of the drive shaft. The outlets of the two second oil passages of the oil supply channel are connected to the oil inlets of the two booster pumps in a one-to-one correspondence. Attached Figure Description

[0031] Figure 1 This is a cross-sectional view of the side-mounted power take-off device in an embodiment of the present invention.

[0032] In the picture:

[0033] 1. Outer shell; 11. First outer shell; 111. First oil passage; 112. Second oil passage; 113. Oil delivery passage; 12. Second outer shell; 121. Oil suction port;

[0034] 21. Drive sub-shaft; 22. Splined shaft; 23. First gear;

[0035] 31. Drive shaft; 32. Second gear; 33. Booster impeller; 34. First bearing; 35. Second bearing;

[0036] 41. Intermediate shaft; 42. Third gear; 43. Third bearing;

[0037] 5. Oil-separating structure;

[0038] 100, pressurization chamber; 200, mounting chamber. Detailed Implementation

[0039] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention 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 the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions. Furthermore, "above," "on top of," and "over" the first feature in relation to the second feature includes the first feature directly above and diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "under," and "below" the first feature in relation to the second feature includes the first feature directly below and diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0041] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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 mechanical connection or an electrical 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 invention based on the specific circumstances.

[0042] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0043] The embodiments of the present invention provide a side-mounted power take-off device and a vehicle power system, wherein the vehicle power system includes the aforementioned side-mounted power take-off device, which can reduce the axial space occupied by the side-mounted power take-off device while satisfying the requirement of boosting the inlet oil pressure of the booster pump.

[0044] like Figure 1As shown, the side-mounted power take-off device includes a housing 1, a drive shaft, and a booster impeller 33. Both ends of the drive shaft are rotatably mounted on the housing 1. The input end of the drive shaft is used to connect to the input end of a driving component, and the drive shaft is used to drive the booster pump. A first gear 23 is fixed on the drive shaft and located inside the housing 1. A transmission shaft 31 is located on the radial side of the drive shaft and is parallel to the drive shaft. Both ends of the transmission shaft 31 are rotatably mounted on the housing 1. A second gear 32 is fixed on the transmission shaft 31 and located inside the housing 1. The second gear 32 is connected to the first gear 23 in a transmission connection. At least one end of the transmission shaft 31 forms a power take-off end. The booster impeller 33 is fixed on the transmission shaft 31. The housing 1 is provided with an oil supply channel and an oil suction port 121 connected to the inlet end of the booster impeller 33. The inlet end of the oil supply channel is connected to the outlet end of the booster impeller 33, and the outlet end of the oil supply channel is used to connect to the oil inlet of the booster pump.

[0045] The vehicle powertrain system provided in this embodiment of the invention further includes a booster pump and a drive unit. The input shaft of the booster pump is connected to the drive shaft, and the output end of the drive unit is connected to the drive shaft. Exemplarily, the booster pump is a plunger pump.

[0046] When the drive unit is working, the drive shaft rotates, causing the input shaft of the connected booster pump to rotate, which in turn boosts the oil pressure. At the same time, the drive shaft drives the first gear 23 to rotate, and the first gear 23 transmits power to the second gear 32. The second gear 32 drives the transmission shaft 31 to rotate, so that the transmission shaft 31 transmits power to the structure connected to the power take-off end of the transmission shaft 31 to realize power output. Thus, while the drive unit drives the booster pump to work, the drive unit also drives the structure connected to the power take-off end to move.

[0047] Since the transmission shaft 31 is located on the radial side of the drive shaft and is set parallel to the drive shaft, the space on the radial side of the drive shaft is fully utilized to arrange the second gear 32, the transmission shaft 31 and the booster impeller 33, thereby reducing the space occupied by the drive shaft axially and reducing the space occupied by the side-mounted power take-off device along the drive shaft axial direction.

[0048] Since the booster impeller 33 is fixed on the drive shaft 31, the outer casing 1 is provided with an oil supply channel and an oil suction port 121 connected to the inlet end of the booster impeller 33. The inlet end of the oil supply channel is connected to the outlet end of the booster impeller 33, and the outlet end of the oil supply channel is used to connect to the oil inlet of the booster pump. This allows the booster impeller 33 to rotate synchronously with the drive shaft 31 when the drive shaft 31 rotates. The oil enters the inlet end of the booster impeller 33 through the oil suction port 121. Under the centrifugal force of the rotation of the booster impeller 33, the oil at the inlet end of the booster impeller 33 is thrown outward along the radial direction of the booster impeller 33 and out of the outlet end of the booster impeller 33. This centrifugal force causes the oil to be pressurized once. The pressurized oil is thrown into the oil supply channel, and the oil in the oil supply channel is sucked to the inlet of the booster pump. After being pressurized a second time by the booster pump, it is output to the working parts.

[0049] The booster impeller 33 pressurizes the inlet oil of the booster pump, ensuring the pump's high oil suction efficiency and effectively solving the problem of cavitation caused by insufficient inlet oil pressure.

[0050] In addition, the drive shaft 31 not only has the function of taking force from the drive shaft 31 in conjunction with the first gear 23 and the second gear 32, but also can work with the booster impeller 33 to boost the inlet oil of the booster pump. This allows the drive shaft 31 to perform both functions, eliminating the need for an additional independent power source for the booster impeller 33, simplifying the vehicle's power system and reducing energy consumption.

[0051] It should be noted that the structure of the booster impeller 33 is a commonly used impeller structure in this field, and will not be described in detail here.

[0052] In some embodiments, one end of the drive shaft 31 is rotatably connected to the housing 1 via a first bearing 34, and the other end of the drive shaft 31 is rotatably connected to the housing 1 via a second bearing 35, so as to improve the smoothness of the rotation of the drive shaft 31.

[0053] In some embodiments, the drive element is an electric motor; alternatively, the drive element may also be an engine.

[0054] In some embodiments, the drive shaft includes two coaxially arranged drive sub-shafts 21, which are connected by a spline shaft 22. The two drive shafts are connected to the input shafts of two booster pumps in a one-to-one correspondence. There are two booster pumps, one of which is used to connect a drive unit and a booster pump, and the other is used to connect another booster pump.

[0055] For example, two booster pumps are disposed at both ends of the drive shaft. One end of the drive shaft away from the spline shaft 22 is connected to the input shaft of the corresponding booster pump. Taking the drive component as an electric motor as an example, the other drive shaft is the rotating shaft of the electric motor. The electric motor is a dual-shaft motor. The end of the rotating shaft of the electric motor away from the spline shaft 22 is connected to the input shaft of the corresponding booster pump. The first gear 23 is fixedly sleeved on the outside of the spline shaft 22.

[0056] As an alternative, the aforementioned booster pump can also be installed.

[0057] In some embodiments, the housing 1 is provided with an oil-separating structure 5, which is sealed to the housing 1 to form a pressurizing chamber 100. The oil outlet and oil inlet of the pressurizing impeller 33 are both located inside the pressurizing chamber 100, and the second gear 32 and the first gear 23 are both located outside the pressurizing chamber 100.

[0058] This configuration ensures that the oil pressurized by the booster impeller 33 will not pass through the second gear 32 and the first gear 23, thus preventing the first gear 23 and the second gear 32 from being submerged in the oil and increasing rotational resistance.

[0059] Specifically, the outer casing 1 includes a first casing 11 and a second casing 12. The first casing 11 and the second casing 12 are connected to form an installation space. The oil separator 5 is located in the installation space and is sealed to the first casing 11. The oil separator 5 divides the installation space into an installation cavity 200 and a pressurizing cavity 100. The spline shaft 22, the first gear 23 and the second gear 32 are all located in the installation cavity 200. The oil inlet end and the oil outlet end of the pressurizing impeller 33 are both located in the pressurizing cavity 100. The inlet end of the oil supply channel extends to the inner wall of the first casing 11 that forms the pressurizing cavity 100.

[0060] As the booster impeller 33 rotates, the oil entering the booster impeller 33 is thrown into the oil supply channel by the centrifugal force generated by the rotation of the booster impeller 33.

[0061] For example, the oil supply channel is provided on the first housing 11, and the oil suction port 121 is provided on the second housing 12.

[0062] In some embodiments, the oil separator 5 is a plate-shaped structure, which is sleeved on the mounting end of the booster impeller 33. The oil separator 5 and the booster impeller 33 are rotatably connected by a fourth bearing, and an oil seal is provided between the oil separator 5 and the mounting end of the booster impeller 33 to prevent oil in the booster chamber 100 from entering the mounting chamber 200. By providing a fourth bearing between the oil separator 5 and the booster impeller 33, the oil separator 5 can be prevented from blocking the rotation of the booster impeller 33, and the smoothness of the rotation of the booster impeller 33 can be improved.

[0063] In some embodiments, the side-mounted power take-off device further includes a third gear 42 and an intermediate shaft 41, both located within the housing 1. The third gear 42 meshes with the first gear 23 and with the second gear 32. The intermediate shaft 41 is fixedly mounted on the housing 1, and the third gear 42 is rotatably sleeved outside the intermediate shaft 41.

[0064] The rotation of the first gear 23 drives the rotation of the third gear 42 meshing with it, which in turn drives the rotation of the second gear 32 meshing with it. The second gear 32 then drives the transmission shaft 31 to rotate. By setting the third gear 42, the rotation direction of the transmission shaft 31 is made the same as the rotation direction of the drive shaft.

[0065] For example, the third gear 42 is rotatably connected to the intermediate shaft 41 via the third bearing 43, which helps to reduce the wear between the third gear 42 and the intermediate shaft 41 during the rotation of the third gear 42 and extend the service life of the third gear 42.

[0066] It is understandable that the intermediate shaft 41 can also be installed in other ways, with the intermediate shaft 41 rotatably mounted on the housing 1 and the third gear 42 fixedly sleeved on the outside of the intermediate shaft 41. Specifically, the third gear 42 can be integrally formed into the intermediate shaft 41, and each of the axial ends of the intermediate shaft 41 can be rotatably mounted on the housing 1 via a third bearing 43. It should be noted that, depending on the power take-off requirements, the third gear 42 can also be omitted, and the first gear 23 and the second gear 32 can be directly meshed.

[0067] In some embodiments, the second gear 32 is integrally formed on the drive shaft 31, which helps to reduce the number of parts, simplify the assembly process, and improve assembly efficiency. In other embodiments, the second gear 32 can also be fixedly sleeved on the outside of the drive shaft 31, for example, by interfering with the second gear 32 and the drive shaft 31, or by using a key to connect the second gear 32 and the drive shaft 31 to restrict the rotation of the second gear 32 relative to the drive shaft 31, and a retaining ring is provided on one side of the second gear 32. The retaining ring and the key are used to axially limit the second gear 32, thereby ensuring that when the second gear 32 rotates, it drives the drive shaft 31 to rotate, so that the drive shaft 31 drives the booster impeller 33 to rotate.

[0068] In some embodiments, the third gear 42 is located outside the pressure chamber 100, that is, the third gear 42 is located inside the mounting cavity 200. This arrangement can prevent the third gear 42 from being immersed in oil when it is located inside the pressure chamber 100, thus avoiding an increase in the rotational resistance of the third gear 42.

[0069] In some embodiments, the booster impeller 33 is mounted to the second gear 32 by a plurality of fasteners spaced apart circumferentially. The mounting method is simple and efficient. Exemplarily, four fasteners are provided, and the four fasteners are equally spaced circumferentially along the booster impeller 33. It should be noted that the number of fasteners is not limited to four; it can also be three, five, or more, which will not be listed here.

[0070] In other embodiments, the mounting end of the booster impeller 33 may be interference-fitted onto the drive shaft 31.

[0071] In some embodiments, the oil supply channel includes a first oil passage 111 and two second oil passages 112, wherein one end of the first oil passage 111 is connected to the oil outlet of the booster impeller 33; the two second oil passages 112 correspond one-to-one with two booster pumps, one end of the second oil passage 112 is connected to the other end of the first oil passage 111, and the other end of the second oil passage 112 is connected to the oil inlet of the corresponding booster pump.

[0072] As the booster impeller 33 rotates, the oil entering the booster impeller 33 is thrown into the first oil passage 111 by the centrifugal force generated by the rotation of the booster impeller 33. Then it is diverted to two second oil passages 112. As the oil continuously enters the first oil passage 111, the oil in the second oil passage 112 continuously enters the oil inlet of the corresponding booster pump, so that the booster pump can pressurize it.

[0073] It should be noted that, Figure 1 The red arrow in the middle indicates the direction of oil flow in the side-mounted power take-off device.

[0074] In some embodiments, an internal spline is provided at each of the axial ends of the drive shaft 31, and an external spline is provided on the structure to be driven. The drive shaft 31 and the structure to be driven are connected by the spline engagement of the internal and external splines, so that the drive shaft 31 can transmit power to the two structures to be driven. Specifically, the structure to be driven is located outside the housing 1.

[0075] In other embodiments, an internal spline may be provided only at one axial end of the drive shaft 31, so that the drive shaft 31 is connected to only one structure to be driven. That is, a drive shaft 31 with internal splines at both ends may be selected according to actual needs, or a drive shaft 31 with internal splines at one end may be selected.

[0076] In some embodiments, the central axis of the oil suction port 121 is set at an angle to the central axis of the drive shaft 31, and along the direction of oil flow in the oil suction port 121, the central axis of the oil suction port 121 gradually approaches the oil inlet end of the booster impeller 33.

[0077] This configuration facilitates the flow of oil into the booster chamber 100 through the oil suction port 121. Under the guidance of the inner wall of the oil suction port 121, the oil flows towards the oil inlet of the booster impeller 33, thereby reducing the flow resistance of the oil and improving the smoothness of the oil flow.

[0078] In some embodiments, the housing 1 is further provided with an oil delivery channel 113, the inlet end of the oil delivery channel 113 is connected to the outlet end of the booster pump, and the outlet end of the oil delivery channel 113 is used to deliver the oil pressurized by the booster pump to the working parts, such as the oil cylinder.

[0079] For example, the oil delivery channel 113 is provided on the first housing 11, and the oil delivery channel 113 and the second oil passage 112 are provided in a one-to-one correspondence. The two oil delivery channels 113 correspond to the two booster pumps, and the oil inlet end of the oil delivery channel 113 is connected to the oil outlet end of the corresponding booster pump.

[0080] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A side-mounted power take-off device, characterized in that, include: Outer shell (1); A drive shaft is rotatably mounted on the housing (1) at both ends. The input end of the drive shaft is used to connect to a drive component. The drive shaft is used to drive the booster pump. A first gear (23) is fixed on the drive shaft inside the housing (1). A drive shaft (31) is located on the radial side of the drive shaft and is parallel to the drive shaft. Both ends of the drive shaft (31) are rotatably mounted on the housing (1). A second gear (32) is fixed on the drive shaft (31) and located inside the housing (1). The second gear (32) is connected to the first gear (23) in a transmission connection. At least one end of the drive shaft (31) forms a power take-off end. A booster impeller (33) is fixed on the drive shaft (31). The housing (1) is provided with an oil supply channel and an oil suction port (121) that is connected to the inlet end of the booster impeller (33). The inlet end of the oil supply channel is connected to the outlet end of the booster impeller (33). The outlet end of the oil supply channel is used to connect to the oil inlet of the booster pump.

2. The side-mounted power take-off device according to claim 1, characterized in that, The outer shell (1) is provided with an oil-separating structure (5), which is sealed to the outer shell (1) to form a pressurizing chamber (100). The pressurizing impeller (33) is located inside the pressurizing chamber (100), and the second gear (32) and the first gear (23) are both located outside the pressurizing chamber (100).

3. The side-mounted power take-off device according to claim 2, characterized in that, The side-mounted power take-off device also includes a component located within the housing (1): The third gear (42) meshes with the first gear (23) and with the second gear (32); An intermediate shaft (41) is fixed to the outer casing (1), and the third gear (42) is rotatably sleeved on the outside of the intermediate shaft (41); or the intermediate shaft (41) is rotatably mounted on the outer casing (1), and the third gear (42) is fixedly sleeved on the outside of the intermediate shaft (41).

4. The side-mounted power take-off device according to claim 3, characterized in that, The third gear (42) is located outside the pressure chamber (100).

5. The side-mounted power take-off device according to any one of claims 1 to 4, characterized in that, The booster impeller (33) is mounted to the second gear (32) by a plurality of fasteners spaced apart along its circumference.

6. The side-mounted power take-off device according to any one of claims 1 to 4, characterized in that, The drive shaft includes two coaxially arranged drive sub-shafts (21), and the two drive sub-shafts (21) are connected by a spline shaft (22); The booster pump is provided in two parts, one of which is a drive subshaft (21) for connecting a drive unit and a booster pump, and the other of which is a drive subshaft (21) for connecting another booster pump.

7. The side-mounted power take-off device according to claim 6, characterized in that, The first gear (23) is fixedly sleeved on the outside of the spline shaft (22).

8. The side-mounted power take-off device according to claim 6, characterized in that, The oil supply channel includes: The first oil passage (111) has one end connected to the oil outlet of the booster impeller (33); Two second oil passages (112) correspond one-to-one with the two booster pumps. One end of the second oil passage (112) is connected to the other end of the first oil passage (111), and the other end is used to connect to the oil inlet of the corresponding booster pump.

9. A vehicle powertrain system, characterized in that, It includes a booster pump, a drive unit, and a side-mounted power take-off device as described in any one of claims 1-8, wherein the drive shaft is connected to the input shaft of the booster pump, the oil inlet of the booster pump is connected to the outlet end of the oil supply channel, and the output end of the drive unit is connected to the input end of the drive shaft.

10. The vehicle power system according to claim 9, characterized in that, The booster pump is provided in two parts, and the input shafts of the two booster pumps are respectively connected to the two ends of the drive shaft. The outlets of the two second oil passages (112) of the oil supply channel are connected to the oil inlets of the two booster pumps in a one-to-one correspondence.

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