Power unit

Abstract

To provide a power unit suppressing the deterioration of cooling performance.SOLUTION: A power unit includes a transmission, a transmission case, a motor, a motor case, and a cooling device. The transmission includes an output gear, an idler gear, and an input gear successively disposed in a first direction. The cooling device includes an electric oil pump, an oil cooler, an oil discharge port provided in the transmission case, and an oil inflow port provided in the motor case. The oil discharge port is provided between a center shaft of the output gear and a center shaft of the idler gear in the first direction. The oil inflow port is provided between a center shaft of the input gear and the center shaft of the idler gear in the first direction. The electric oil pump and the oil cooler are disposed on a line connecting the oil discharge port and the oil inflow port in the first direction. The motor case includes a terminal stand on the opposite side to the oil inflow port with respect to the center shaft of the input gear, in the first direction.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a power unit including a motor, a transmission, and a cooling device for cooling them. [Background technology]

[0002] Patent Document 1 discloses a device that cools a transaxle with oil. The cooling device in Patent Document 1 circulates oil between the transaxle and a water jacket using an electric oil pump. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-060037 Summary of the Invention [Problem to be solved by the invention]

[0004] In cooling systems that use oil, the oil flow path becomes longer, which causes pressure loss and a decrease in the oil flow rate and flow velocity, resulting in a decrease in the cooling performance of the system.

[0005] The present disclosure aims to provide a power unit having a cooling device in which deterioration of cooling performance is suppressed. [Means for solving the problem]

[0006] A first aspect of the present disclosure relates to a power unit. The power unit includes a transmission having an output gear, an idler gear, and an input gear, a transmission case that houses the transmission, a motor connected to the input gear, a motor case that houses the motor and has a terminal block, and a cooling device that circulates oil inside the transmission case and inside the motor case. The cooling device is provided in a motor case, with an output gear, an idler gear, and an input gear arranged in that order, and includes an oil inlet arranged between the central axis of the idler gear and the central axis of the input gear in a first direction perpendicular to the axial direction of each gear, an oil discharge outlet arranged in the transmission case and between the central axis of the output gear and the central axis of the idler gear in the first direction, an electric oil pump connected to the oil discharge outlet by a hose, and an oil cooler connected to the outlet of the electric oil pump and connected to the oil inlet by a hose. The electric oil pump and the oil cooler are each disposed on a line connecting the oil inlet and the oil outlet. The terminal block is disposed on the opposite side of the oil inlet with respect to the central axis of the input gear in the first direction. [Effects of the Invention]

[0007] According to the power unit of the present disclosure, the oil outlet and oil inlet can be installed close to each other, thereby shortening the oil cooling system path and preventing a decrease in the cooling performance of the cooling device. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a schematic diagram of a power unit according to an embodiment of the present invention; [Figure 2] 3 shows the positional relationship of each part in a first direction in the power unit of this embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] FIG. 1 is a schematic diagram of a power unit according to this embodiment.

[0010] The power unit 1 includes a transmission 2 housed in a transmission case 3. The transmission 2 further includes an input gear 4, an idler gear 5, and an output gear 6.

[0011] In Fig. 1, the gears provided in the transmission 2 are arranged in the following order from the top of the page: output gear 6, idler gear 5, and input gear 4. In Fig. 1, the direction from the input gear 4 to the output gear 6, pointing upward on the page and perpendicular to the axial direction of each gear, is defined as a first direction.

[0012] The power unit 1 further includes a motor 7 housed in a motor case 8. The motor 7 is connected to an input gear 4 provided in the transmission 2. The motor case 8 includes a terminal block 17.

[0013] The power unit 1 further includes a cooling device C.

[0014] The cooling device C includes an electric oil pump 9 and an oil cooler 10. The electric oil pump 9 is connected to an oil discharge port 11 provided in the transmission case 3 by a hose 13. The oil cooler 10 is connected to the outlet of the electric oil pump 9, and is also connected to an oil inlet 12 provided in the motor case 8 by a hose 13.

[0015] In the cooling device C, the electric oil pump 9 and the oil cooler 10 may be connected by a hose 13 or may be directly connected. Alternatively, the electric oil pump 9 and the oil cooler 10 may be an integrated device.

[0016] The transmission 2 is a component that receives input from the motor 7 and obtains a desired output.

[0017] Specifically, the input gear 4 receives input from the motor 7 and transmits the rotational force to the output gear 6 via the idler gear 5. The output gear 6 outputs the received power to the outside. The idler gear 5 plays a role in converting the rotational direction of the rotational force.

[0018] In this embodiment, the cooling device C cools the transmission 2 and the motor 7 by circulating oil inside the transmission case 3 and the motor case 8. Specifically, the oil is pumped from the electric oil pump 9, cooled in the oil cooler 10, flows into the motor case 8 from the oil inlet 12, passes through the transmission case 3, and is discharged from the oil outlet 11, and returns to the electric oil pump 9.

[0019] In the cooling device C, if the distance from the oil discharge port 11 to the oil inlet 12 is long, a pressure loss of the oil and a decrease in the flow rate and flow velocity will occur, resulting in a decrease in the cooling performance of the cooling device C.

[0020] 2 shows the positional relationship of each part in a first direction in the power unit of this embodiment. In FIG. 2, the first direction is the direction from right to left on the paper, and corresponds to the first direction in FIG.

[0021] The oil discharge port 11 is disposed between the central axis 16 of the output gear 6 and the central axis 15 of the idler gear 5 in the first direction.

[0022] The oil inlet 12 is disposed between the central axis 14 of the input gear 4 and the central axis 15 of the idler gear 5 in the first direction.

[0023] The electric oil pump 9 is disposed on a line connecting the oil discharge port 11 and the oil inlet 12 .

[0024] The oil cooler 10 is disposed on a line connecting the oil discharge port 11 and the oil inlet 12 .

[0025] By arranging the electric oil pump 9, oil cooler 10, oil discharge port 11, and oil inlet 12 as described above, the path through which the oil circulates, i.e., the cooling path, is minimized in the cooling device C. By shortening the oil circulation path, i.e., optimizing the cooling path, oil pressure loss is suppressed, and cooling performance is improved.

[0026] Optimizing the cooling path shortens the length of the hose 13 connecting the oil outlet 11 and the electric oil pump 9, and the length of the hose 13 connecting the oil cooler 10 and the oil inlet 12. As a result, the hose 13 can be fixed to the motor case 8 and other vehicle components with a reduced number of fasteners. This improves the workability of assembling and replacing each component, and also reduces the risk of foreign matter contamination.

[0027] The terminal block 17 is disposed at a position far from the oil inlet 12 to avoid interference with the oil inlet 12. Therefore, the terminal block 17 is disposed on the opposite side of the oil inlet 12 in the first direction with respect to the central axis 14 of the input gear 4. By disposing the terminal block 17 in this way, it is possible to ensure a distance between the cooling path and the terminal block 17. [Explanation of symbols]

[0028] 1 power unit 2 Transmission 3 Transmission case 4 input gear 5 Idler Gear 6 output gears 7 motors 8 Motor case 9 Electric oil pump 10 Oil cooler 11 Oil outlet 12 Oil inlet 13 hose 14 Input gear center axis 15Idler gear center axis 16. Center axis of output gear 17 terminal block C cooling device

Claims

[Claim 1] a transmission including an output gear, an idler gear, and an input gear; a transmission case that houses the transmission; a motor connected to the input gear; a motor case that houses the motor and has a terminal block; a cooling device that circulates oil inside the transmission case and the motor case; Equipped with The cooling device is an oil inlet provided in the motor case, the output gear, the idler gear, and the input gear being arranged in that order, and the oil inlet being positioned between a central axis of the idler gear and a central axis of the input gear in a first direction perpendicular to an axial direction of each gear; an oil discharge port provided in the transmission case and positioned between a central axis of the output gear and a central axis of the idler gear in the first direction; an electric oil pump connected to the oil discharge port by a hose; an oil cooler connected to an outlet of the electric oil pump and connected to the oil inlet by a hose; Equipped with the electric oil pump and the oil cooler are respectively disposed on a line connecting the oil inlet and the oil outlet on a projection plane perpendicular to the axial direction of each gear, The terminal block is disposed on the opposite side of the oil inlet with respect to the central axis of the input gear in the first direction. A power unit characterized by:

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