Power transmission

Abstract

[Problem] To increase the support stability of two pumps.　[Solution] A power transmission device having a case for housing a power transmission mechanism, a control valve that controls hydraulic pressure supplied to the power transmission mechanism and that is vertically arranged within the case, and a first pump and second pump that supply oil to the control valve, wherein: the case has a first support wall that supports a rotating shaft of the power transmission mechanism, a second support wall that supports the control valve and that is oriented along the rotating shaft, a first chamber located on one side of the first support wall, a second chamber adjacent to the first chamber with the second support wall therebetween, and a third support wall extending from the second support wall along the rotating shaft to the other side of the first support wall; the first pump is attached to the first support wall within the first chamber; and the second pump is attached to the third support wall within the second chamber.

Description

[Technical field]

[0001] The present invention relates to a power transmission device. [Background technology]

[0002] Patent Document 1 discloses a drive device for a vehicle. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2015 / 107979 Summary of the Invention [Problem to be solved by the invention]

[0004] In this drive unit, the mechanical oil pump and the electric oil pump share a strainer. The strainer is supported by the mechanical oil pump in a cantilever manner. The electric oil pump and the mechanical oil pump are attached to one side and the other side of the same wall portion so that the strainer can be shared.

[0005] Both the mechanical oil pump and the electric oil pump are seismic sources. Therefore, in order to suppress vibration, it is necessary to increase the thickness of the wall and improve the support stability of the mechanical oil pump and the electric oil pump. When the mechanical oil pump and the electric oil pump are attached to the same wall, the wall needs to be thicker, but the thicker the wall, the larger the axial dimension of the drive unit becomes. For this reason, in a drive unit (power transmission unit) equipped with two pumps of this kind, there is a demand for increasing the support stability of the two pumps while suppressing an increase in size. [Means for solving the problem]

[0006] One aspect of the present invention is A case that houses a power transmission mechanism; a control valve that controls hydraulic pressure supplied to the power transmission mechanism and is disposed vertically within the case; a first pump and a second pump that supply oil to the control valve, The case is a first support wall that supports a rotation shaft of the power transmission mechanism; a second support wall that supports the control valve and is oriented along the rotation shaft; a first chamber located on one side of the first support wall; a second chamber adjacent to the first chamber with the second support wall therebetween; a third support wall extending from the second support wall along the rotation axis to the other side of the first support wall, the first pump is attached to the first support wall within the first chamber; The second pump is a power transmission device mounted within the second chamber to the third support wall. Effect of the Invention

[0007] According to one aspect of the present invention, it is possible to improve the support stability of two pumps while suppressing an increase in size. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a schematic diagram showing a schematic configuration of a power transmission device. [Diagram 2] FIG. 2 is a view of the case seen from the second cover side. [Diagram 3] FIG. 3 is a view of the case seen from the third cover side. [Figure 4] FIG. 4 is a schematic cross-sectional view of the housing taken along line AA in FIG. [Diagram 5] FIG. 5 is a schematic cross-sectional view of the housing taken along line AA in FIG. [Figure 6] FIG. 6 is a perspective view of the strainer as viewed from above the upper case side. [Figure 7] FIG. 7 is a diagram illustrating a support structure for the mechanical oil pump in the partition portion. [Figure 8] FIG. 8 is a view of the storage section as seen from the front side of the vehicle. [Figure 9] FIG. 9 is a schematic cross-sectional view of the housing taken along line AA in FIG. [Figure 10] FIG. 10 is a schematic cross-sectional view of the housing taken along line AA in FIG. [Figure 11] FIG. 11 is a schematic cross-sectional view of the housing taken along line BB in FIG. [Figure 12] FIG. 12 is a schematic cross-sectional view of the housing taken along line CC in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] First, the definitions of terms used in this specification will be explained. The power transmission device is a device that has at least a power transmission mechanism, and the power transmission mechanism is, for example, at least one of a gear mechanism, a differential gear mechanism, and a reduction mechanism. In the following embodiments, an example is given in which the power transmission device has the function of transmitting the output rotation of the engine, but the power transmission device may be one that transmits the output rotation of at least one of the engine and a motor (rotating electric machine).

[0010] "Overlapping when viewed in a predetermined direction" means that a plurality of elements are lined up in a predetermined direction, and is synonymous with "overlapping in a predetermined direction." The "predetermined direction" is, for example, the axial direction, the radial direction, the direction of gravity, the vehicle traveling direction (the vehicle forward direction, the vehicle backward direction), etc. When a drawing shows multiple elements (parts, portions, etc.) arranged in a specified direction, it may be assumed that the description in the specification contains a sentence explaining that they overlap when viewed in the specified direction.

[0011] "Not overlapping when viewed in a predetermined direction" and "offset when viewed in a predetermined direction" mean that multiple elements are not lined up in a predetermined direction, and are synonymous with "not overlapping in a predetermined direction" and "offset in a predetermined direction." Examples of the "predetermined direction" include the axial direction, radial direction, gravity direction, and vehicle travel direction (vehicle forward direction, vehicle backward direction). When a drawing shows that multiple elements (parts, portions, etc.) are not lined up in a specified direction, it may be assumed that the description in the specification contains a sentence explaining that they do not overlap when viewed in the specified direction.

[0012] "When viewed from a predetermined direction, a first element (part, section, etc.) is located between a second element (part, section, etc.) and a third element (part, section, etc.)" means that when observed from a predetermined direction, it can be observed that the first element is located between the second element and the third element. The "predetermined direction" refers to the axial direction, radial direction, gravity direction, vehicle running direction (vehicle forward direction, vehicle backward direction), etc. For example, when the second element, the first element, and the third element are arranged in that order along the axial direction, it can be said that the first element is located between the second element and the third element when viewed in the radial direction. When the drawing shows that the first element is between the second element and the third element when viewed in a specific direction, it may be deemed that the description in the specification contains a sentence explaining that the first element is between the second element and the third element when viewed in the specific direction.

[0013] When two elements (parts, portions, etc.) overlap in an axial view, the two elements are coaxial.

[0014] "Axial direction" refers to the axial direction of the rotation shaft of a component constituting the power transmission device. "Radial direction" refers to the direction perpendicular to the rotation shaft of a component constituting the power transmission device. The component is, for example, a motor, a gear mechanism, a differential gear mechanism, etc.

[0015] The "downstream side in the direction of rotation" means the downstream side in the direction of rotation when the vehicle is moving forward or when the vehicle is moving backward. It is preferable to be on the downstream side in the direction of rotation when the vehicle is moving forward, which is the more frequent case.

[0016] "Vertical placement" of a control valve means that, in the case of a control valve having a basic configuration in which a separator plate is sandwiched between valve bodies, the valve bodies of the control valve are stacked in a horizontal direction based on the installation state of the power transmission device on the vehicle. The "horizontal direction" here does not mean a horizontal direction in the strict sense, but also includes cases where the stacking direction is inclined relative to the horizontal line.

[0017] Furthermore, "vertically mounted" of the control valve means that the control valve is arranged so that the multiple pressure regulating valves within the control valve are aligned in the direction of a vertical line VL based on the installation state of the power transmission device on the vehicle. "Aligning a plurality of pressure regulating valves in the direction of the vertical line VL" means that the pressure regulating valves (valve bodies) in the control valve are arranged with their positions shifted in the direction of the vertical line VL.

[0018] In this case, the pressure regulating valves do not need to be strictly aligned in a row in the direction of the vertical line VL. For example, in the case where a control valve is formed by stacking multiple valve bodies, in a vertically oriented control valve, multiple pressure regulating valves may be aligned in the direction of the vertical line VL while being shifted in the stacking direction of the valve bodies.

[0019] Furthermore, when viewed from the axial direction (the direction of forward and backward movement) of the valve disc provided in the pressure regulating valve, the multiple pressure regulating valves do not need to be aligned at intervals in the direction of the vertical line VL. When viewed from the axial direction (the direction of forward and backward movement) of the valve disc provided in the pressure regulating valve, multiple pressure regulating valves do not need to be adjacent to each other in the direction of the vertical line VL.

[0020] Therefore, for example, when pressure regulating valves lined up in the vertical line VL direction are arranged with their positions shifted in the stacking direction (horizontal direction) of the valve body, this also includes cases where adjacent pressure regulating valves in the vertical line VL direction are arranged in a positional relationship where they partially overlap when viewed from the stacking direction.

[0021] Furthermore, when a control valve is "vertically mounted," this means that multiple pressure regulating valves within the control valve are arranged in such a way that the movement direction of the valve body (spool valve) of the pressure regulating valve is aligned along the horizontal line. In this case, the movement direction of the valve body (spool valve) is not limited to the horizontal direction in the strict sense. The movement direction of the valve body (spool valve) in this case is the direction along the rotation axis X of the power transmission device. In this case, the direction of the rotation axis X and the sliding direction of the valve body (spool valve) are the same.

[0022] Hereinafter, an embodiment of the present invention will be described. FIG. 1 is a schematic diagram illustrating a general configuration of a power transmission device 1. As shown in FIG.

[0023] As shown in FIG. 1, a housing HS of the power transmission device 1 is composed of a case 6, a first cover 7, a second cover 8, and a third cover 9. The housing HS accommodates a torque converter T / C, a forward / reverse switching mechanism 2, a variator 3, a reduction gear mechanism 4, a differential gear 5, an electric oil pump EOP, a mechanical oil pump MOP, a control valve CV, a strainer 10, etc. Here, the torque converter T / C, the forward / reverse switching mechanism 2, the variator 3, the reduction gear mechanism 4, and the differential gear 5 are components of the power transmission mechanism of the present invention.

[0024] In the power transmission device 1, the output rotation of an engine ENG (drive source) is input to a forward / reverse switching mechanism 2 via a torque converter T / C. The rotation input to the forward / reverse switching mechanism 2 is input to a primary pulley 31 of the variator 3 in a forward or reverse rotation.

[0025] In the variator 3, the winding radius of the belt 30 around the primary pulley 31 and the secondary pulley 32 is changed, so that the rotation input to the primary pulley 31 is changed in speed at a desired gear ratio and output from the output shaft 33 of the secondary pulley 32.

[0026] The output rotation of the secondary pulley 32 is input to a differential device 5 (differential gear mechanism) via a reduction gear mechanism 4, and then transmitted to the drive wheels WH, WH via left and right drive shafts 55A, 55B.

[0027] The reduction mechanism 4 has an output gear 41 , an idler gear 42 , a reduction gear 43 , and a final gear 45 . The output gear 41 rotates integrally with the output shaft 33 of the secondary pulley 32 . The idler gear 42 is meshed with the output gear 41 so as to be capable of transmitting rotation. The idler gear 42 rotates integrally with an idler shaft 44. A reduction gear 43 having a smaller diameter than the idler gear 42 is provided on the idler shaft 44. The reduction gear 43 is meshed with a final gear 45 fixed to the outer periphery of a differential case 50 of the differential device 5 so as to be capable of transmitting rotation.

[0028] In the power transmission device 1, the forward / reverse switching mechanism 2, the torque converter T / C, and the output shaft of the engine ENG are arranged coaxially (concentrically) on the rotation axis X1 (first shaft) of the primary pulley 31. The output shaft 33 of the secondary pulley 32 and an output gear 41 are coaxially arranged on a rotation axis X2 (second shaft) of the secondary pulley 32. The idler gear 42 and the reduction gear 43 are coaxially arranged on a common rotation axis X3. The final gear 45 and the drive shafts 55A, 55B are arranged coaxially on a common rotation axis X4. In the power transmission device 1, these rotation axes X1 to X4 are set in a positional relationship in which they are parallel to one another. Hereinafter, these rotation axes X1 to X4 will be collectively referred to as the rotation axis X of the power transmission device 1 (power transmission mechanism) as necessary.

[0029] FIG. 2 is a schematic diagram showing the case 6 as viewed from the second cover 8 side. FIG. 3 is a schematic diagram showing the case 6 as viewed from the first cover 7 side. In the enlarged view of Fig. 2, the strainer 10 and the mechanical oil pump MOP are omitted, and only the area around the connection parts 625 and 627 provided in the partition part 62 is shown. Furthermore, in the enlarged view of Fig. 2 and Fig. 3, in order to make the position of the opening 620 easy to understand, the area of ​​the opening 620 is shown with cross hatching.

[0030] As shown in FIG. 2, the case 6 has a cylindrical peripheral wall portion 61 and a partition wall portion 62. 1, the partition 62 divides the space inside the peripheral wall 61 into two in the direction of the rotation axis X1. One side of the partition 62 in the direction of the rotation axis X1 is a first chamber S1, and the other side is a third chamber S3. In the case 6, the opening on the first chamber S1 side is sealed by the second cover 8 (torque converter cover) to form a closed first chamber S1. The opening on the third chamber S3 side is sealed by the first cover 7 (side cover) to form a closed third chamber S3. The first chamber S1 accommodates the forward / reverse switching mechanism 2, the reduction mechanism 4, and the differential gear 5. The third chamber S3 accommodates the variator 3.

[0031] In the case 6, a storage section 68 that forms the second chamber S2 is provided on the outer periphery of the peripheral wall section 61 on the vehicle front side. The storage section 68 is provided with an opening facing the vehicle front side. The opening of the storage section 68 is sealed with the third cover 9 to form a closed second chamber S2. The second chamber S2 is provided with a control valve CV and an electric oil pump EOP.

[0032] 1, the control valve CV has a basic structure in which a separate plate 920 is sandwiched between valve bodies 921, 921. A hydraulic control circuit (not shown) is formed inside the control valve CV. The hydraulic control circuit is provided with a solenoid that is driven based on commands from a control device (not shown), and a pressure regulating valve SP (spool valve) that is operated by a signal pressure generated by the solenoid, etc.

[0033] In the second chamber S2, the control valve CV is disposed vertically with the stacking direction of the valve bodies 921, 921 aligned along the vehicle front-rear direction. As a result, the direction of the forward and backward movement of the spool valve in the control valve is aligned along the horizontal line. Furthermore, the spool valve in the control valve is offset in position along the vertical line VL. This prevents the second chamber S2 from becoming larger in the front-rear direction of the vehicle while not impeding the forward and backward movement of the spool valve.

[0034] 2, the partition wall 62 of the case 6 is provided in a range that crosses the rotation axes (rotation axes X1 to X4) of the power transmission mechanism. The partition wall 62 is provided in a direction that is approximately perpendicular to the rotation axes (rotation axes X1 to X4).

[0035] The partition wall 62 is provided with through holes 621 , 622 , 624 and a support hole 623 . The through hole 621 is formed around the rotation axis X1. A cylindrical support wall portion 631 surrounding the through hole 621 and a peripheral wall portion 641 surrounding the outer periphery of the support wall portion 631 at a distance are provided on the surface of the partition portion 62 facing the first chamber S1 (the front side of the paper). In Fig. 2, the support wall portion 631 and the peripheral wall portion 641 protrude toward the front side of the paper (the side toward the second cover 8 in Fig. 1).

[0036] An area 651 between the support wall portion 631 and the peripheral wall portion 641 is a cylindrical space that accommodates a piston (not shown) of the forward / reverse switching mechanism 2, friction plates (forward clutch, reverse brake), and the like. The input shaft 34 (see FIG. 1) of the primary pulley 31 is rotatably supported on the inner periphery of the support wall portion 631 via a bearing B.

[0037] As shown in FIG. 2, the through hole 622 is formed centered on the rotation axis X2. In the power transmission device 1 mounted on the vehicle V, the rotation axis X2 is located obliquely above and on the rear side of the vehicle when viewed from the rotation axis X1. A peripheral wall portion 632 surrounding the through hole 622 rotatably supports the output shaft 33 (see FIG. 1) of the secondary pulley 32.

[0038] As shown in FIG. 2, the support hole 623 is a bottomed hole formed around the rotation axis X3. In the power transmission device 1 mounted on the vehicle V, the rotation axis X3 is located diagonally upward and rearward of the vehicle as viewed from the rotation axis X1, and diagonally downward and rearward of the vehicle as viewed from the rotation axis X2. A peripheral wall portion 633 surrounding the support hole 623 supports the idler shaft 44 (see FIG. 1) rotatably.

[0039] As shown in FIG. 2, the through hole 624 is formed centered on the rotation axis X4. In the power transmission device 1 mounted on the vehicle V, the rotation axis X4 is located diagonally downward on the vehicle rear side as viewed from the rotation axis X1, diagonally downward on the vehicle rear side as viewed from the rotation axis X2, and diagonally downward on the vehicle front side as viewed from the rotation axis X3.

[0040] A cylindrical support wall portion 634 is provided on the surface of the partition portion 62 facing the first chamber S1 (the front side of the page) and surrounding the through hole 624. A differential case 50 (see FIG. 1) of the differential device 5 is rotatably supported on the inner periphery of the support wall portion 634 via a bearing B. A drive shaft 55A extending from the differential case 50 passes through the through hole 624. 1, a final gear 45 having a ring shape when viewed from the direction of the rotation axis X4 is fixed to the outer periphery of the differential case 50. The final gear 45 rotates integrally with the differential case 50 about the rotation axis X4.

[0041] In this manner, partition portion 62 functions as a support wall for input shaft 34 of primary pulley 31, output shaft 33 of secondary pulley 32, idler shaft 44, differential case 50, and drive shaft 55A.

[0042] In the case 6, an area on the vehicle front side of the final gear 45 and below the arc-shaped peripheral wall portion 641 serves as an accommodating portion 67 for the strainer 10 and the mechanical oil pump MOP. The storage portion 67 is located in the lower portion inside the case 6 (housing HS). Therefore, the storage portion 67 stores oil OL used for driving and cooling the components of the power transmission mechanism.

[0043] As shown in FIG. 4, the storage section 67 is a bottomed space with an opening facing the first chamber S1 side (the right side in FIG. 4). The housing portion 67 is formed in the lower part of the case 6 in a range that crosses in the direction of the rotation axis X1 below an area 651 in which the forward / reverse switching mechanism 2 is housed.

[0044] An opening 620 penetrating the partition 62 in the direction of the rotation axis X1 is formed in the lower part of the partition 62. The first chamber S1 and the third chamber S3 in the case 6 communicate with each other via this opening 620.

[0045] 2, the opening 620 is provided at a position overlapping with a tangent line Lm when viewed from the direction of the rotation axis X1. Here, the tangent line Lm is a tangent line connecting the outer periphery of the arc-shaped peripheral wall portion 641 surrounding the forward / reverse switching mechanism 2 (not shown) and the outer periphery of the final gear 45. The opening 620 is formed in a range extending from the region between the peripheral wall portion 641 and the final gear 45 along the straight line Ln, crossing the tangent line Lm from above to below, to the lower part of the case 6. Here, the straight line Ln is a straight line that passes between the peripheral wall portion 641 and the final gear 45 and is perpendicular to the tangent line Lm. In the power transmission device 1, the area between the peripheral wall portion 641 and the final gear 45 tends to be unused dead space, but the dead space is effectively utilized to provide the opening 620.

[0046] 4, in the storage section 67, a connection section 625 of the strainer 10 is provided at a position adjacent to the peripheral wall section 641. The connection section 625 is a cylindrical section with a connection port 625a facing the second cover 8 side (first chamber S1 side). 2, when viewed from the direction of the rotation axis X1, the connection portion 625 is provided in a positional relationship in which a portion of a lower region overlaps with the opening 620. When viewed from the direction of the rotation axis X1, a portion of a lower region of the connection portion 625 protrudes into the opening 620.

[0047] As shown in FIG. 4, an oil passage 626 opens at the rear side of the connecting portion 625 . 2, oil passage 626 extends linearly within partition portion 62 in a direction away from opening 620. Oil passage 626 is connected to electric oil pump EOP accommodated in accommodation portion 68 via oil passage 281 (see FIG. 10) in case 6.

[0048] 2, in the housing portion 67, a connection portion 627 for connecting to the mechanical oil pump MOP is provided below the oil passage 626. A connection port 627a of the connection portion 627 opens in the same direction as the connection port 625a of the connection portion 625. The connection port 627a of the connection portion 627 is connected to an oil passage 628 provided in the partition portion 62. The oil passage 628 extends below the oil passage 626 along the oil passage 626 toward the housing portion 68 (right side in the figure). The oil passage 628 is connected to the control valve CV (see FIG. 12) installed in the housing portion 68 via an oil passage in the case 6.

[0049] 3, on the surface of the case 6 facing the first cover 7, a partition 62 is located inside a peripheral wall 61 that surrounds the third chamber S3, and an opening 620 is formed in a lower portion of the partition 62. Furthermore, inside the peripheral wall 61, through holes 621 and 622 are formed above the partition 62. Inside the peripheral wall portion 61, in an upper region in the direction of the vertical line VL, the primary pulley 31 and the secondary pulley 32 of the variator 3 are located. The peripheral wall portion 61 has a lower portion, on the lower side of the area where the primary pulley 31 is provided, that bulges out significantly toward the lower side of the case 6, and an opening 620 is located at the bottom of this bulging area.

[0050] When the power transmission device 1 is in operation, oil OL supplied via an oil passage (not shown) is sprayed toward the belt 30 of the variator 3 in the third chamber S3 to lubricate the belt 30 of the variator 3. The oil OL that has lubricated the belt 30 moves, under its own weight, within the third chamber S3 toward the lower portion where the opening 620 is provided, and passes through the opening 620 to be returned to the lower portion of the first chamber S1 where the strainer 10 is disposed.

[0051] Fig. 4 is a schematic cross-sectional view of the housing HS taken along line AA in Fig. 2. In Fig. 4, the periphery of the connection between the strainer 10 and the partition wall portion 62 is shown. Fig. 5 is a schematic cross-sectional view of the housing HS taken along line AA in Fig. 4. In Fig. 5, the arrangement of the strainer 10 and the mechanical oil pump MOP in the housing portion 67 is shown typically. FIG. 6 is a perspective view of the strainer 10 as viewed from above the upper case 11 side.

[0052] As shown in FIGS. 4 and 5, the strainer 10 has a basic configuration in which a filter 19 is disposed in a space S10 formed between the upper case 11 and the lower case 12.

[0053] 6, a first connection part 15 is provided on one side part 11a of the upper case 11. The first connection part 15 is a cylindrical member having an oil discharge path 151 therein. The first connection part 15 protrudes obliquely upward from the one side part 11a of the upper case 11. A second connection part 16 is provided on the base side of the first connection part 15. As shown in Fig. 4, the second connection part 16 has a bottomed tubular shape having a drainage path 161 for oil OL therein.

[0054] The first connection portion 15 and the second connection portion 16 are provided in a direction such that the opening directions of the discharge paths 151, 161 are perpendicular to each other. The discharge passage 161 in the second connection part 16 and the discharge passage 151 in the first connection part 15 open into the space S10 inside the strainer 10.

[0055] 6, upper case 11 is provided with a recess 17 (notch) recessed toward lower case 12 in a region located on an extension of discharge passage 161 in second connection portion 16. Therefore, as shown in FIG. 4, tubular member 130 for connecting strainer 10 to connection portion 625 on the partition portion 62 side can be inserted into discharge passage 161 from the side of strainer 10 without interfering with upper case 11. 2, the strainer 10 has an intake port 13 at a portion facing the bottom wall portion 613. Here, the bottom wall portion 613 is an area disposed at a lower portion of the peripheral wall portion 61 of the case 6 in the direction of a vertical line VL based on the installation state of the power transmission device 1 on the vehicle V.

[0056] 5, the strainer 10 is assembled to the mechanical oil pump MOP by inserting the tip 15a side of the first connection portion 15 into a connection port 120 on the mechanical oil pump MOP side. The mechanical oil pump MOP is adapted to be assembled to the partition portion 62, and the strainer 10 is supported by the partition portion 62 via the mechanical oil pump MOP.

[0057] 7 is a diagram illustrating the support structure of the mechanical oil pump MOP in the partition portion 62. This Fig. 7 is a schematic cross-sectional view of the mechanical oil pump MOP taken along the line AA in Fig. 5. As shown in FIG. 7, a positioning protrusion 150 and a discharge port 140 for the oil OL are provided at a portion of the mechanical oil pump MOP facing the partition wall portion 62. In the partition wall 62, an insertion hole 630 and a connection portion 627 are formed on the surface facing the mechanical oil pump MOP.

[0058] The mechanical oil pump MOP is positioned at a predetermined position on the partition wall portion 62 by inserting the protrusion 150 into the insertion hole 630 of the partition wall portion 62. In this state, the mechanical oil pump MOP is fixed to the partition wall portion 62 by a bolt (not shown). When the mechanical oil pump MOP is fixed to the partition wall portion 62, the discharge port 140 of the mechanical oil pump MOP is disposed at a position facing the connection portion 627 on the partition wall portion 62 side, and the discharge port 140 and the connection portion 627 are communicated with each other. The connection portion 627 is connected to an oil passage 628 in the partition wall portion 62. Therefore, the oil OL discharged from the discharge port 140 of the mechanical oil pump MOP is supplied to the oil passage 628 through the connection portion 627. The oil OL supplied to the oil passage 628 is supplied to the control valve CV in the accommodation portion 68 (see FIG. 12).

[0059] Here, the direction in which the mechanical oil pump MOP is attached to the partition wall portion 62 (left-right direction in FIG. 7) is the same as the direction in which the second connection portion 16 of the strainer 10 is attached to the partition wall portion 62 (left-right direction in FIG. 4). Therefore, when the mechanical oil pump MOP is attached to the partition wall portion 62, the second connection portion 16 of the strainer 10 is connected to the connection portion 625 on the partition wall portion 62 side via the tubular member 130 at almost the same time. In this state, the strainer 10 has the first connection portion 15 supported by the mechanical oil pump MOP, and the second connection portion 16 attached to the partition portion 62 via a tubular member 130 inserted into the second connection portion 16.

[0060] Fig. 8 is a view of the accommodation portion 68 as seen from the front side of the vehicle. In Fig. 8, the second chamber S2 as seen from the front side of the vehicle is shown typically together with other components of the housing HS (the case 6, the first cover 7, and the second cover 8). Additionally, the area of ​​the joint portion 683 located on the front side of the page is shown with cross hatching. The exterior of the control valve CV is shown typically. The enlarged view of FIG. 8 is an enlarged schematic view of the housing chamber 69 (third support wall) located on the rear side of the paper surface of the electric oil pump EOP.

[0061] 8, the housing 68 has a peripheral wall 681 that surrounds the entire outer periphery of the second chamber S2 when viewed from the front side of the vehicle. The end face of the peripheral wall 681 on the front side of the page forms a joint 683 with the third cover 9.

[0062] 1, the storage portion 68 is oriented along the rotation axis X of the power transmission device 1. The storage portion 68 is formed to have a range in the direction of the rotation axis X (left-right direction in the figure) that extends from a region adjacent to the peripheral wall portion 61 of the case 6 to the side of the first cover 7.

[0063] 1, approximately half of the inside of storage section 68 on the second cover 8 side (right side in the figure) is a bottom wall section 682 (second support wall), and approximately half of the inside of storage section 68 on the first cover 7 side is a bottom wall section 691 (third support wall). Bottom wall section 682 and bottom wall section 691 are provided with a shift in position in the front-rear direction of the vehicle. The bottom wall portion 682 is formed integrally with the peripheral wall portion 61 on the side of the case 6. The bottom wall portion 691 is provided on the vehicle front side of the first cover 7 with a gap between it and the outer periphery of the first cover 7.

[0064] As shown in FIG. 8, in the second chamber S2, the control valve CV is vertically disposed with the stacking direction of the valve bodies 921, 921 oriented along the vehicle front-rear direction (the front-rear direction on the paper). In the second chamber S2, the control valve CV is vertically oriented so as to satisfy the following conditions: (a) multiple pressure regulating valves SP (spool valves) in the control valve CV are aligned along a vertical line VL (up-down direction) based on the installation state of the power transmission device 1 on the vehicle V, and (b) the direction Xp of the forward and backward movement of the pressure regulating valves SP (spool valves) is oriented along the horizontal line.

[0065] This allows the control valve CV to be disposed vertically in the second chamber S2 while not hindering the back and forth movement of the pressure regulating valve SP (spool valve). This prevents the second chamber S2 from becoming large in the front-rear direction of the vehicle.

[0066] When viewed from the front side of the vehicle, the control valve CV has a generally L-shape with a notch 923 provided in a generally rectangular valve body 921. The notch 923 is provided to avoid interference with the electric oil pump EOP. When viewed from the front side of the vehicle, the electric oil pump EOP has a portion on the second cover 8 side (the left side in the figure) accommodated in the cutout portion 923. Therefore, when viewed from the direction of the vertical line VL, a portion of the electric oil pump EOP overlaps with the control valve CV.

[0067] As shown in FIG. 8, in the second chamber S2, the control valve CV and the electric oil pump EOP are arranged side by side in the direction of the rotation axis X of the power transmission device 1 (the left-right direction in the figure). When viewed from the front side of the vehicle, the control valve CV is provided in a positional relationship overlapping with the case 6. When viewed from the front side of the vehicle, the electric oil pump EOP is provided in a positional relationship overlapping with the first cover 7.

[0068] The electric oil pump EOP has a basic configuration in which a control unit 51, a motor unit 52, and a pump unit 53 are arranged in series in the direction of a rotation axis Z1 of a motor M. The electric oil pump EOP is provided with its rotation axis Z1 oriented perpendicular to the rotation axis X of the power transmission device 1. In this state, the electric oil pump EOP is vertically oriented with the pump unit 53 located on the upper side of the second chamber S2 (accommodation chamber 69) and the control unit 51 located on the lower side of the second chamber S2 (accommodation chamber 69).

[0069] Fig. 9 is a schematic cross-sectional view of the housing HS taken along line AA in Fig. 8. In Fig. 9, a cross-section of the accommodation chamber 69 in the second chamber S2 is shown, together with a cross-section of the peripheral wall portion 71 of the first cover 7 located on the vehicle rear side.

[0070] As shown in FIG. 8, in a bottom wall portion 682 of the accommodation portion 68, an accommodation chamber 69 for the electric oil pump EOP is provided in an area overlapping with the first cover 7 when viewed from the front side of the vehicle. As shown in Fig. 9, the accommodation chamber 69 is formed by causing the bottom wall portion 682 to bulge towards the first cover 7 side (the right side in Fig. 9). When viewed from the bottom wall portion 682, the bottom wall portion 691 of the accommodation chamber 69 is located a distance D69 away from the first cover 7 side. A wall portion 693 connected to the upper side of the bottom wall portion 682 extends towards the front side of the vehicle above the electric oil pump EOP. A wall portion 692 connected to the lower side of the bottom wall portion 682 extends towards the front side of the vehicle below the electric oil pump EOP, It is located on the extension of the peripheral wall portion 681 of the storage portion 68.

[0071] In this embodiment, a portion of the electric oil pump EOP on the first cover 7 side is accommodated in the accommodation chamber 69. As shown in the enlarged view of FIG. 8, a bottom wall portion 691 of the accommodation chamber 69 is provided with two boss portions 21, 22 each having a bolt hole 21a, 22a. In the accommodation chamber 69, the boss portions 21, 21 are arranged horizontally and spaced apart above the vertical line VL. The boss portions 22, 22 are arranged horizontally and spaced apart below the boss portions 21, 21 in the vertical line VL. Bolts BL1, BL1 passing through the electric oil pump EOP are screwed into the bolt holes 21a, 21a of the boss portions 21, 21. Bolts BL2, BL2 passing through the electric oil pump EOP are screwed into the bolt holes 22a, 22a of the boss portions 22, 22. As a result, the electric oil pump EOP is positioned and fixed at a predetermined position on the bottom wall portion 691 within the accommodation chamber 69. In the bottom wall portion 691, a reinforcing rib 23 is provided so as to straddle the boss portions 21 and 21. The rib 23 is provided so as to be oriented along the horizontal line.

[0072] A boss portion 26 is provided in the bottom wall portion 691 at a position adjacent to the boss portion 22 on the control valve CV side. The boss portion 26 has an oil supply port 26a opening therein for supplying oil OL. A reinforcing rib 24 is provided at the lower part of the bottom wall portion 691, straddling the boss portion 26 and the boss portion 22. The rib 24 is provided in a direction along the horizontal line.

[0073] On the side of the boss portion 22 to which the rib 24 is connected (the right side in the drawing), a boss portion 25 is provided above the boss portion 22. The boss portion 25 has a discharge port 25a for the oil OL opened therein. A bulging portion 27 that bulges out toward the front side of the page is provided on the control valve CV side (left side in the figure) as viewed from the boss portion 25. The bulging portion 27 extends toward the control valve CV side along a horizontal line.

[0074] 9, a bottom wall 691 of the housing chamber 69 is provided with a gap between it and the peripheral wall 71 of the first cover 7. A bulging portion 28 that bulges toward the peripheral wall 71 (right side in the figure) is provided on the outer periphery of the bottom wall 691. The bulging portion 28 is located on the opposite side of the boss portion 26, with the bottom wall 691 in between. An oil passage 281 is provided inside the bulging portion 28. The oil passage 281 is connected to an oil OL supply port 26a provided in the boss portion 26.

[0075] FIG. 10 is a cross-sectional view of the housing HS taken along the line AA in FIG. 10, the oil passage 281 extends linearly in the direction of the rotation axis X of the power transmission device within the bulge portion 28 provided on the bottom wall portion 691. The bulge portion 28 is provided across the bottom wall portion 691 and the partition portion 62. The oil passage 281 is a blind hole provided in the bulge portion 28. A base end 281a of the oil passage 281 opens into an end face of the bulging portion 28. The opening of the oil passage 281 on the side of the base end 281a is sealed by a plug PL. The tip 281 b of the oil passage 281 intersects with the oil passage 626 in the partition portion 62 described above.

[0076] The oil passage 626 extends linearly within the partition wall portion 62. The oil passage 626 is a blind hole provided in the partition wall portion 62. A base end 626a of the oil passage 626 opens into the second chamber S2. The opening of the oil passage 626 on the side of the base end 626a is sealed by a plug PL. An end 626 b of the oil passage 626 communicates with the connection port 625 a of the connection portion 625 described above.

[0077] Here, the term "blind hole" in this specification means a linear oil hole with one end (tip) closed. The oil passages 281, 626 are formed, for example, by drilling the case 6 (bulge 28) after casting. In the case of the oil passage 281, a hole with a dead end at the tip is machined without penetrating the region of the bulge 28. In other words, a "blind hole" is a hole formed so that the tip is a dead end without penetrating the processed region of the oil passage, and is formed, for example, by processing such as drilling. In this embodiment, oil passages 626, 281 that connect the electric oil pump EOP and the strainer 10 are formed by communicating two blind holes.

[0078] When the electric oil pump EOP is driven, the oil OL stored in the lower part of the housing HS is sucked through the strainer 10. The oil OL sucked into the strainer 10 flows into the oil passage 626 from the second connecting portion 16. The oil OL that has flowed into the oil passage 626 flows into an oil passage 281 that opens on the second chamber S2 side in the oil passage 626, and is supplied from an oil OL supply port 26a that communicates with the oil passage 281 into the electric oil pump EOP.

[0079] FIG. 11 is a cross-sectional view of the housing HS taken along line BB in FIG. 11, the oil passage 271 extends linearly in the direction of the rotation axis X of the power transmission device within the bulge portion 27 provided on the bottom wall portion 691. The bulge portion 27 is provided across the bottom wall portion 691 and the partition portion 62. The oil passage 271 is a blind hole provided in the bulge portion 27. A base end 271a of the oil passage 271 opens into an end face of the bulge portion 27. The opening on the side of the base end 271a of the oil passage 271 is sealed by a plug PL.

[0080] An end 271 b of the oil passage 271 intersects with an oil passage 629 in the partition portion 62 . The oil passage 629 extends linearly inside the partition wall 62. The oil passage 629 is a blind hole provided in the partition wall 62. A base end 629a of the oil passage 629 communicates with the control valve CV located in the second chamber S2.

[0081] The oil passage 271 is connected to an oil discharge port 25a. When the electric oil pump EOP is driven, the oil OL pressurized in the electric oil pump EOP is supplied into the oil passage 271 from the discharge port 25a. The oil OL supplied to the oil passage 271 is supplied to the control valve CV through an oil passage 629.

[0082] FIG. 12 is a cross-sectional view of the housing HS taken along line CC in FIG. As shown in FIG. 12, a rib 29 is provided on the outer periphery of the bottom wall portion 691. 9, the rib 29 extends from the lower region of the bulging portion 28 in a direction approaching the peripheral wall portion 71 of the first cover 7. The rib 29 is provided substantially parallel to the lower wall portion 692 of the accommodation chamber 69.

[0083] 12, the rib 29 is provided across the bottom wall portion 691 and the partition wall portion 62. The rib 29 is formed in a shape such that a bulging width W29 from the bottom wall portion 691 becomes wider as it approaches the partition wall portion 62. Therefore, when viewed from the vertical line direction, the rib 29 is provided at an angle. The peripheral wall portion 71 of the first cover 7 is joined to the partition portion 62 of the case 6, and the bottom wall portion 691 extends from the partition portion 62 on the side of the peripheral wall portion 71 in a direction away from the partition portion 62. The rib 29 is provided by utilizing the gap between the peripheral wall portion 71 , the partition wall portion 62 and the bottom wall portion 691 . An oil passage 628 is provided in the partition wall portion 62 in a region overlapping with the rib 29 when viewed from the mechanical oil pump MOP side (the right side in the figure). The oil passage 628 is a blind hole provided in the partition wall portion 62. A base end 628a of the oil passage 628 communicates with the control valve CV located in the second chamber S2.

[0084] When the mechanical oil pump MOP is driven, the oil OL stored in the lower part of the housing HS is sucked into the mechanical oil pump MOP through the strainer 10. The oil OL sucked into the strainer 10 flows into the mechanical oil pump MOP from the first connection part 15. Then, the oil OL pressurized by the mechanical oil pump MOP is supplied into the oil passage 628 through the discharge port 140 and the connection part 627. The oil OL supplied to the oil passage 628 is supplied to the control valve CV through the oil passage 628.

[0085] Thus, in the power transmission device 1, the electric oil pump EOP is supported by the bottom wall portion 691. The bottom wall portion 691 is a wall portion separate from the partition wall portion 62 which is involved in supporting the mechanical oil pump MOP. The bottom wall portion 691 along the rotation axis X of the power transmission device 1 and the partition wall portion 62 perpendicular to the rotation axis X are provided in directions perpendicular to each other. Furthermore, the rib 29 provided on the outer periphery of the bottom wall portion 691 is provided straddling the bottom wall portion 691 and the partition wall portion 62, thereby increasing the rigidity strength of the bottom wall portion 691 and the partition wall portion 62. By mounting the mechanical oil pump MOP on the first chamber S1 side of the partition wall portion 62 and mounting the electric oil pump EOP on the second chamber S2 side of the bottom wall portion 691, the support stability of the mechanical oil pump MOP and the electric oil pump EOP is improved.

[0086] When the mechanical oil pump MOP and the electric oil pump EOP are provided on one side and the other side of the same wall, the noise and vibration caused by the natural vibration frequency of each pump tends to become louder. As described above, the mechanical oil pump MOP and the electric oil pump EOP are provided on different walls, and are provided in a positional relationship in which the rotation axis of the mechanical oil pump MOP and the rotation axis of the electric oil pump EOP are perpendicular to each other (not parallel or coaxial). Therefore, it is expected that the noise and vibration caused by the natural vibration frequency of each pump will be reduced.

[0087] Furthermore, in the bottom wall portion 691 supporting the electric oil pump EOP, the bulge portion 28 is located on one surface in the thickness direction, and the bulge portion 27 is located on the other surface. When supporting the electric oil pump EOP, the thickness of the bottom wall portion 691 is not made thicker overall, but is made thicker locally, and the bulging directions of the thickened portions are staggered in the vertical direction. This ensures the rigidity and strength of the bottom wall portion 691 without increasing the overall thickness of the bottom wall portion 691. Therefore, the support stability of the electric oil pump EOP on the bottom wall portion 691 is improved without significantly increasing the weight of the power transmission device 1.

[0088] Furthermore, since there is a gap between the bottom wall portion 613 and the first cover 7, there is a sufficient space between the bottom wall portion 691 and the first cover 7 to dispose the bulging portion 28 and the rib 29. This makes it possible to provide the bulge 28 and the rib 29 across the bottom wall 691 and the partition 62, thereby increasing the rigidity of the bottom wall 691 and the partition 62, without increasing the size of the housing HS.

[0089] Unlike the case where the electric oil pump EOP and the mechanical oil pump MOP are provided on one surface and the other surface of the same wall portion, there is no need to increase the thickness of the bottom wall portion 691 and the partition wall portion 62. Increasing the thickness of the partition portion 62 may result in an increase in size of the power transmission device 1 in the direction of the rotation axis X (vehicle width direction), and increasing the thickness of the bottom wall portion 691 may result in an increase in size of the power transmission device 1 in the radial direction of the rotation axis X (vehicle front-rear direction). As described above, by providing the electric oil pump EOP and the mechanical oil pump MOP in different wall portions, it is possible to suitably prevent the power transmission device 1 from becoming larger in size due to an increase in the thickness of the wall portions.

[0090] As described above, the power transmission device 1 according to this embodiment has the following configuration. (1) A power transmission device 1 includes: The housing HS (case) that houses the power transmission mechanism, The control valve CV controls the hydraulic pressure supplied to the power transmission mechanism and is vertically mounted in the housing HS. This is a power transmission device having a mechanical oil pump MOP (first pump) that supplies oil OL to a control valve CV, and an electric oil pump EOP (second pump). Housing HS is A partition wall portion 62 (first support wall) that supports a rotating shaft of the power transmission mechanism; A bottom wall portion 682 (second support wall) that supports the control valve CV and is disposed along the rotation axis; A first chamber S1 located on one side of the partition wall portion 62; A second chamber S2 adjacent to the first chamber S1 with a bottom wall portion 682 therebetween; and a bottom wall portion 691 (third support wall) extending from the bottom wall portion 682 to the other side of the partition portion 62 along the rotation axis. The mechanical oil pump MOP is attached to the partition wall portion 62 in the first chamber S1. The electric oil pump EOP is attached to the bottom wall portion 691 in the second chamber S2.

[0091] With this configuration, in the housing HS, the electric oil pump EOP is provided on the bottom wall portion 691, which is a wall portion different from the partition portion 62 involved in supporting the mechanical oil pump MOP. In other words, the electric oil pump EOP and the mechanical oil pump MOP are supported by different walls (the bottom wall portion 691 and the partition portion 62) in the housing HS. In this case, the rigidity required for each wall is lower than when the electric oil pump EOP and the mechanical oil pump MOP are supported by the same wall. If the electric oil pump EOP and the mechanical oil pump MOP are supported by the same wall, for example, the partition wall 62, it becomes necessary to increase the thickness of the partition wall 62 to increase its rigidity. In this case, the power transmission device 1 becomes larger by the amount of the thicker partition wall 62, and the weight of the entire power transmission device 1 increases.

[0092] In particular, when the electric oil pump EOP and the mechanical oil pump MOP are supported on one side and the other side of the same wall (opposite arrangement of the pumps), and the rotation shafts of the electric oil pump EOP and the mechanical oil pump MOP are arranged parallel to each other or coaxially and oriented along the rotation shaft of the power transmission device, it is necessary to increase the thickness of the wall in the direction of the rotation shaft, which increases the size of the power transmission device in the direction of the rotation shaft. For example, if the power transmission device 1 is installed in a front-engine, front-drive vehicle (FF vehicle), if the power transmission device 1 becomes larger in the vehicle width direction along the rotation axis, there is a concern that this will affect the mountability on the vehicle. In a front-wheel drive vehicle, the power transmission device is disposed between the left and right drive wheels WH, WH. Not only the power transmission device 1 but also the drive source (engine) and other components are arranged between the left and right drive wheels WH, WH. Therefore, the dimension of the power transmission device 1 in the direction of the rotation axis is an important factor that affects mountability, and it is desirable to keep the dimension of the power transmission device 1 in the direction of the rotation axis as small as possible. As described above, by supporting the electric oil pump EOP and the mechanical oil pump MOP on different walls (the bottom wall 691 and the partition 62), it is possible to prevent the power transmission device 1 from becoming larger in size in the rotational axis direction. This makes it possible to suitably prevent an increase in the weight of the power transmission device 1 while minimizing the impact on vehicle mountability. Furthermore, when the electric oil pump EOP and the mechanical oil pump MOP are arranged on one side and the other side of the thickness direction of the same partition wall, problems with noise and vibration due to the natural vibration frequency of each pump occur. In order to reduce noise caused by noise and vibration, measures such as thickening the wall and reviewing the positional relationship of the pumps are necessary. Increasing the thickness of the wall will cause problems with the size and weight of the power transmission device. Reviewing the positional relationship of the pumps will reduce the freedom of layout. As described above, by supporting the electric oil pump EOP and the mechanical oil pump MOP on different wall portions, it is possible to suitably prevent the power transmission device 1 from becoming larger and to prevent an increase in weight, while ensuring freedom of layout.

[0093] (2) The third chamber S3 is located on the other side of the partition wall 62. The bottom wall portion 691 (third support wall) is located on the side of the third chamber S3. The bottom wall portion 691 and the bottom wall portion 682 form a second chamber S2. When viewed from the radial direction of the rotation axis X, the second chamber S2 is provided in a positional relationship where it overlaps with the first chamber S1 and the third chamber S3.

[0094] With this configuration, the second chamber S2 is disposed radially outward of the first chamber S1 and the third chamber S3 in the rotational axis X. The second chamber S2 is provided over substantially the entire length of the housing HS in the direction of the rotational axis X. In the second chamber S2, the control valve CV attached to the bottom wall portion 682 and the electric oil pump EOP attached to the bottom wall portion 691 are disposed side by side in the direction of the rotational axis X of the power transmission device 1. In the case where the second chamber S2 is provided adjacent to the first chamber S1, if the second chamber S2 is formed only by the bottom wall portion 682, an unused space will be left on the side of the third chamber S3. As described above, if the bottom wall portion 691 is provided and the second chamber S2 is formed using both the bottom wall portion 682 and the bottom wall portion 691, the second chamber S2 is formed extending from the side of the first chamber S1 to the side of the third chamber S3. This makes it possible to secure a space in the second chamber S2 in which the electric oil pump EOP can be disposed. Therefore, the components of the power transmission device 1 can be disposed without leaving a large unused space around the housing HS. Here, if the control valve CV and the electric oil pump EOP cannot be arranged side by side in the direction of the rotation axis X, the control valve CV and the electric oil pump EOP will be arranged side by side in the radial direction of the rotation axis X (the front-to-rear direction of the vehicle). In such a case, the power transmission device 1 will become larger in size in the radial direction of the rotation axis X (the front-to-rear direction of the vehicle). As described above, since the control valve CV and the electric oil pump EOP can be arranged side by side in the direction of the rotation axis X, it is possible to preferably prevent the power transmission device 1 from becoming larger in size in the radial direction of the rotation axis X (the front-to-rear direction of the vehicle).

[0095] (3) a strainer 10 attached to the partition wall portion 62; The strainer 10 and an electric oil pump EOP (second pump) are connected to each other through an oil passage (oil passage 626, oil passage 281) for the electric oil pump EOP. The second pump oil passage (oil passage 626, oil passage 281) is an oil passage 626 (first oil passage) extending linearly within the partition wall portion 62; The oil passage 281 (second oil passage) extends linearly within the bottom wall portion 691 and communicates with the oil passage 626. The oil passage 626 is a blind hole that opens into the second chamber S2. The oil passage 281 is a blind hole that opens to the end of the bottom wall portion 691 . An opening of a base end 626a of the oil passage 626 and an opening of a base end 281a of the oil passage 281 are each sealed with a plug PL.

[0096] When the electric oil pump EOP and the mechanical oil pump MOP are provided in different wall portions (bottom wall portion 691, partition portion 62), oil passage 626 and oil passage 281 can be merged simply by forming oil holes in each wall portion (bottom wall portion 691, partition portion 62) so that linearly provided oil passage 626 (first oil passage) and linearly provided oil passage 281 (second oil passage) intersect. This makes it easier to form the oil passages compared to when the electric oil pump EOP and the mechanical oil pump MOP are provided in the same wall portion.

[0097] (i) The oil passage 626 is a linear machined hole whose tip is closed and ends in a dead end, and whose base end opens into the second chamber S2. The oil passage 281 is a linear machined hole whose tip is closed and forms a dead end, and whose base end opens at the end of the bottom wall portion 691 . The two machined holes with dead ends intersect to form an oil passage that connects the strainer 10 and the electric oil pump EOP.

[0098] With this configuration, the oil passage connecting the strainer 10 and the electric oil pump EOP can be easily formed by simply providing two linear machined holes so that they intersect.

[0099] (4) The mechanical oil pump MOP is supported by the partition wall 62 near the bottom wall portion 682 in the first chamber S1.

[0100] With this configuration, the mechanical oil pump MOP is disposed in the second chamber S2 at a position closest to the control valve CV. In the second chamber S2, the electric oil pump EOP is disposed adjacent to the control valve CV, so that when viewed from the control valve CV, the electric oil pump EOP is disposed adjacent to the control valve CV in the direction of the rotation axis X, and the mechanical oil pump MOP is disposed adjacent to the control valve CV in the radial direction of the rotation axis X. This allows the lengths of the oil passages (oil passage 271, oil passage 629) connecting the electric oil pump EOP and the control valve CV, and the oil passage 628 connecting the mechanical oil pump MOP and the control valve CV to be shortened. This shortens the time required to supply oil OL from the pumps (mechanical oil pump MOP, electric oil pump EOP) to the control valve CV, and is expected to improve the hydraulic response of the control valve CV.

[0101] (5) The bottom wall portion 691 is formed so that the thickness of the area in which the oil passage 281 (second oil passage) is provided is greater than the other areas.

[0102] With this configuration, even if oil passage 281 is formed inside bottom wall portion 691, the rigidity of bottom wall portion 691 can be ensured. In addition, because oil passage 281 reaches partition wall portion 62, the thickened region of bottom wall portion 691 also reaches partition wall portion 62. Therefore, the thickened region of bottom wall portion 691 also functions as a reinforcing rib for bottom wall portion 691, so that the supporting strength of bottom wall portion 691 for electric oil pump EOP can be ensured.

[0103] (6) A third oil passage (oil passage 271, oil passage 629) is provided connecting the electric oil pump EOP and the control valve CV. In the bottom wall portion 691, the oil passage 281 (second oil passage) and the oil passage 271 (third oil passage) are aligned vertically. The bottom wall portion 691 is also formed thicker in the area where the oil passage 271 is provided. In the bottom wall portion 691 , the bulging direction of the region of the oil passage 281 is one side of the bottom wall portion 691 , and the bulging direction of the oil passage 271 is the other side of the bottom wall portion 691 .

[0104] When configured in this manner, for example, the bulging direction of the region of oil passage 281 (bulge portion 28) is toward the third chamber S3 located on one side of the bottom wall portion 691, and the bulging direction of the region of oil passage 271 (bulge portion 27) is on the opposite side to the third chamber S3. This ensures the rigidity of the bottom wall portion 691.

[0105] (7) A peripheral wall portion 71 surrounding the outer periphery of the third chamber S3; The bottom wall portion 691 has a rib 29 that bulges out toward the peripheral wall portion 71 side. The peripheral wall portion 71 is provided so as to be connected to the partition wall portion 62, and is provided with a gap between it and the bottom wall portion 691. The rib 29 is provided straddling the bottom wall portion 691 and the partition portion 62 in the gap between the peripheral wall portion 71 and the bottom wall portion 691 (gap in the radial direction of the rotation axis X).

[0106] Since the range of the third chamber S3 in the adjacent direction between the first chamber S1 and the second chamber S2 (in the radial direction of the rotation axis X) is smaller than that of the first chamber S1, a gap is left between the third chamber S3 and the second chamber S2, providing ample space. By forming the thicker area of ​​the bottom wall portion 691 as a rib 29 that bulges into the space between the third chamber S3 and the second chamber S2, it is possible to effectively utilize the unused space around the housing HS while ensuring the rigidity of the bottom wall portion 691.

[0107] (8) The rib 29 is formed in a shape such that the width W19 of the rib 29 protruding from the bottom wall portion 691 increases as the rib 29 approaches the partition wall portion 62.

[0108] With this configuration, the rigidity of the partition wall 62 and the bottom wall 691 can be ensured while suppressing an increase in the weight of the housing HS.

[0109] (ii) In the second chamber S2, the control valve CV is arranged in such a manner that the multiple pressure regulating valves SP are aligned vertically. When viewed from the direction of the rotation axis X of the power transmission device 1, the control valve CV is provided in a positional relationship overlapping with the electric oil pump EOP.

[0110] If the control valve CV is arranged in such a manner that a plurality of pressure regulating valves SP are aligned horizontally, the control valve CV will take up a large amount of space in the horizontal direction. As described above, when the control valves CV are arranged so that multiple pressure regulating valves SP are lined up in the vertical direction, the horizontal area required for installing the control valves is smaller than when the control valves are arranged so that multiple pressure regulating valves are lined up in the horizontal direction. This reduces the thickness of the second chamber S2 in the horizontal direction, and therefore makes it possible to preferably prevent the power transmission device 1 from becoming large in size in the horizontal direction. Furthermore, when the electric oil pump EOP is disposed vertically in the second chamber S2 with the rotation axis Z1 aligned vertically, the electric oil pump EOP can be provided within the range of the thickness of the control valve CV as viewed from the direction of the rotation axis Z1. As a result, even if the electric oil pump EOP is provided in the second chamber S2, the second chamber S2 does not become larger in the horizontal direction. This also makes it possible to preferably prevent the power transmission device 1 from becoming larger in the horizontal direction.

[0111] In the above embodiment, the power transmission device 1 transmits the rotation of the engine ENG to the drive wheels WH, WH, but the power transmission device 1 may transmit the rotation of at least one of the engine ENG and a motor (rotating electric machine) to the drive wheels WH, WH. For example, the power transmission device 1 may be of a one-motor, two-clutch type (a type in which a motor is disposed between the engine ENG and the power transmission device, a first clutch is disposed between the engine ENG and the motor, and a second clutch is disposed within the power transmission device 1). In the above embodiment, the power transmission device 1 has a speed change function, but the power transmission mechanism may not have a speed change function and may simply decelerate (or may increase) the speed. In the case where the power transmission device does not have a speed change function and is configured to reduce the speed of the motor and transmit the rotation to the drive wheels WH, WH, a hydraulic control circuit for supplying oil OL for cooling the motor and oil OL for lubricating the speed reduction mechanism is disposed in the second chamber S2 together with the electric oil pump EOP. In the above embodiment, the control unit of the power transmission device 1 has a control valve CV, but in the case where the power transmission device 1 does not have a speed change mechanism and the drive source is a motor (rotating electric machine) instead of the engine ENG, the control unit may have an inverter or the like for driving and controlling the motor.

[0112] Although the embodiments of the present invention have been described above, the present invention is not limited to the aspects shown in these embodiments. Appropriate modifications are possible within the scope of the technical concept of the invention. [Explanation of symbols]

[0113] 1 Power transmission device 2. Forward / reverse switching mechanism (power transmission mechanism) 3 Variator (power transmission mechanism) 4. Reduction mechanism (power transmission mechanism) 5 Differential (power transmission mechanism) 29 Ribs 69 Partition wall (first support wall) 682 Wall section (second support wall) 682B Wall (3rd support wall) 626 Oil path (2nd pump oil path: 1st oil path) 626a proximal end 281 Oil path (2nd pump oil path: 2nd oil path) 281a proximal end 271 Oil road (3rd oil road) 629 Oil road (3rd oil road) CV Control Valve HS housing (case) MOP Mechanical Oil Pump (1st Pump) EOP Electric Oil Pump (2nd Pump) PL plug S1 Room 1 S2 Room 2 S3 Room 3

Claims

1. a case that houses a power transmission mechanism; a control valve that controls hydraulic pressure supplied to the power transmission mechanism and is disposed vertically within the case; a first pump and a second pump that supply oil to the control valve, The case is a first support wall that supports a rotation shaft of the power transmission mechanism; a second support wall that supports the control valve and is oriented along the rotation shaft; a first chamber located on one side of the first support wall; a second chamber adjacent to the first chamber with the second support wall therebetween; a third support wall extending from the second support wall along the rotation axis to the other side of the first support wall, the first pump is attached to the first support wall within the first chamber; The second pump is attached to the third support wall within the second chamber.

2. In claim 1, A third chamber is located on the other side of the first support wall, The third support wall is located on a side of the third chamber, the third support wall forms the second chamber together with the second support wall; A power transmission device, wherein the second chamber is provided in a positional relationship overlapping with the first chamber and the third chamber when viewed in a radial direction of the rotating shaft.

3. In claim 2, A strainer attached to the first support wall; a second pump oil passage connecting the strainer and the second pump, The second pump oil passage is a first oil passage extending linearly within the first support wall; a second oil passage that extends linearly within the third support wall and communicates with the first oil passage, the first oil passage is a blind hole that opens into the second chamber, the second oil passage is a blind hole that opens to an end portion of the third support wall, a power transmission device, wherein an opening at a base end of the first oil passage and an opening at a base end of the second oil passage are each sealed with a plug.

4. In claim 3, The first pump is supported by the first support wall adjacent the second support wall within the first chamber.

5. In claim 3, a region of the third support wall where the second oil passage is provided being thicker than other regions of the third support wall;

6. In claim 4, a region of the third support wall where the second oil passage is provided being thicker than other regions of the third support wall;

7. In claim 6, a third oil passage connecting the second pump and the control valve; In the third support wall, the second oil passage and the third oil passage are vertically aligned, The third support wall is formed so as to have a large thickness in a region where the third oil passage is provided, In the third support wall, a bulging direction of a region of the second oil passage is one side of the third support wall, A power transmission device, wherein a bulging direction of the third oil passage region is to the other side of the third support wall.

8. In claim 7, A peripheral wall portion surrounding an outer periphery of the third chamber; a rib protruding from the third support wall toward the peripheral wall portion, The peripheral wall portion is provided on the first support wall and is provided with a gap between the peripheral wall portion and the third support wall, The rib is provided across the third support wall and the second support wall.

9. In claim 8, The rib is formed in a shape such that a width of the rib protruding from the third support wall increases as the rib approaches the first support wall.

10. In any one of claims 1 to 9, A power transmission device, wherein the first pump and the second pump are provided in a non-overlapping positional relationship when viewed from a rotational axis direction of the power transmission mechanism.

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