Power transmission device

Abstract

To inhibit increase in the size of a power transmission device.SOLUTION: A power transmission device includes: a power transmission mechanism which transmits driving force of a drive source to drive wheels; a housing which houses the power transmission mechanism; and a charging pipe for guiding an oil level gauge into the housing. The charging pipe is provided within the housing.SELECTED DRAWING: Figure 7

Description

Technical Field

[0004] , , , , , , , The outer wall portion enclosing the aforementioned power transmission mechanism, , , The aforementioned housing is , , The aforementioned cover portion is , , It has a cover portion that covers the opening in the outer wall portion, ,

[0005]

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

Background Art

[0002] Patent Document 1 discloses that a guide pipe for guiding an oil level gauge is attached to the outer wall of a casing of an automatic transmission.

Prior Art Document

[0006] According to one aspect of the present invention, it is possible to suppress the increase in size of the power transmission device. [Brief explanation of the drawing]

[0007] [Figure 1] Figure 1 is a schematic diagram illustrating the arrangement of the power transmission system in a vehicle. [Figure 2] Figure 2 is a schematic diagram showing the general configuration of the power transmission system. [Figure 3] Figure 3 shows the case as viewed from the second cover side. [Figure 4] Figure 4 shows the second cover as viewed from the case side. [Figure 5] Figure 5 shows the second cover as viewed from the engine side. [Figure 6] Figure 6 is a cross-sectional view illustrating the arrangement of the charging pipes. [Figure 7] Figure 7 is a cross-sectional view illustrating the arrangement of the charging pipes. [Figure 8] Figure 8 is a diagram illustrating the arrangement of the charging pipes. [Modes for carrying out the invention]

[0008] First, the definitions of terms used in this specification will be explained. The power transmission device is a device having 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 embodiment, we will illustrate a case where the power transmission device 1 has the function of transmitting the output rotation of the engine, but the power transmission device 1 only needs to transmit the output rotation of at least one of the engine and the motor (rotating electricity).

[0009] "Overlap in a predetermined direction view" means that a plurality of elements are arranged in a predetermined direction, and is synonymous with the case of describing "overlap in a predetermined direction". The "predetermined direction" is, for example, the axial direction, the radial direction, the gravitational direction, the vehicle traveling direction (the vehicle forward direction, the vehicle backward direction), etc. When it is illustrated on the drawing that a plurality of elements (parts, portions, etc.) are arranged in a predetermined direction, in the description of the specification, it may be regarded that there is a sentence explaining that they overlap in the predetermined direction view.

[0010] "Do not overlap in a predetermined direction view" and "offset in a predetermined direction view" mean that a plurality of elements are not arranged in a predetermined direction, and are synonymous with the case of describing "do not overlap in a predetermined direction" and "offset in a predetermined direction". The "predetermined direction" is, for example, the axial direction, the radial direction, the gravitational direction, the vehicle traveling direction (the vehicle forward direction, the vehicle backward direction), etc. When it is illustrated on the drawing that a plurality of elements (parts, portions, etc.) are not arranged in a predetermined direction, in the description of the specification, it may be regarded that there is a sentence explaining that they do not overlap in the predetermined direction view.

[0011] "In a predetermined direction view, the first element (part, portion, etc.) is located between the second element (part, portion, etc.) and the third element (part, portion, etc.)" means that when observed from the predetermined direction, it can be observed that the first element is between the second element and the third element. The "predetermined direction" is the axial direction, the radial direction, the gravitational direction, the vehicle traveling direction (the vehicle forward direction, the vehicle backward direction), etc. For example, when the second element, the first element, and the third element are arranged in this order along the axial direction, it can be said that in the radial direction view, the first element is located between the second element and the third element. When it is illustrated on the drawing that in a predetermined direction view, the first element is between the second element and the third element, in the description of the specification, it may be regarded that there is a sentence explaining that in the predetermined direction view, the first element is between the second element and the third element.

[0012] When two elements (parts, components, etc.) overlap in the axial direction view, the two elements are coaxial.

[0013] The "axial direction" means the axial direction of the rotation axis of the parts constituting the power transmission device. The "radial direction" means the direction perpendicular to the rotation axis of the parts constituting the power transmission device. The parts are, for example, a motor, a gear mechanism, a differential gear mechanism, etc.

[0014] The "downstream side in the rotational direction" means the downstream side in the rotational direction when the vehicle is moving forward or the downstream side in the rotational direction when the vehicle is moving backward. It is preferable to be on the downstream side in the rotational direction when the vehicle is moving forward frequently.

[0015] For the "vertical installation" of the control valve, in the case of a control valve having a basic configuration in which a separate plate is sandwiched between valve bodies, it means that the valve bodies of the control valve are stacked in the horizontal line direction based on the installation state of the power transmission device on the vehicle. Here, the "horizontal line direction" does not mean the horizontal line direction in the strict sense, and includes the case where the stacking direction is inclined with respect to the horizontal line.

[0016] Furthermore, the "vertical installation" of the control valve means that the control valve is arranged with a plurality of pressure regulating valves in the control valve arranged in the vertical line VL direction based on the installation state of the power transmission device on the vehicle. "Arranging a plurality of pressure regulating valves in the vertical line VL direction" means that the pressure regulating valves in the control valve are arranged with their positions shifted in the vertical line VL direction.

[0017] In this case, it is not necessary for the plurality of pressure regulating valves to be strictly arranged in a line in the vertical line VL direction. For example, when a control valve is formed by stacking a plurality of valve bodies, in the vertically installed control valve, a plurality of pressure regulating valves may be arranged in the vertical line VL direction while shifting their positions in the stacking direction of the valve bodies.

[0018] Furthermore, when viewed from the axial direction (movement direction) of the valve body of a pressure regulating valve, it is not necessary for multiple pressure regulating valves to be spaced apart in the vertical direction VL. When viewed from the axial direction (movement direction) of the valve body of a pressure regulating valve, it is not necessary for multiple pressure regulating valves to be adjacent to each other in the vertical direction VL.

[0019] Therefore, for example, if pressure regulating valves arranged in the vertical direction VL are offset in the stacking direction (horizontal direction) of the valve bodies, this also includes cases where, when viewed from the stacking direction, adjacent pressure regulating valves in the vertical direction VL are positioned in a partially overlapping position.

[0020] Furthermore, if the control valve is "vertically mounted," it means that the multiple pressure regulating valves within the control valve are arranged in such a way that the direction of movement of the valve body (spool valve) of the pressure regulating valve is aligned with the horizontal line. In this case, the direction of movement of the valve body (spool valve) is not strictly limited to the horizontal direction. In this case, the direction of movement of the valve body (spool valve) is along the rotation axis X of the power transmission device. In this case, the direction of rotation axis X and the sliding direction of the valve body (spool valve) are the same.

[0021] Embodiments of the present invention will be described below. Figure 1 is a schematic diagram illustrating the arrangement of the power transmission device 1 in vehicle V. Figure 2 is a schematic diagram illustrating the general configuration of the power transmission device 1.

[0022] As shown in Figure 1, the power transmission device 1 is positioned between the left and right frames FR, FR at the front of the vehicle V. The housing HS of the power transmission device 1 consists of a case 6, a first cover 7, a second cover 8, and a third cover 9. As shown in Figure 2, the housing HS contains a torque converter T / C, a forward / reverse switching mechanism 2, a variator 3, a reduction mechanism 4, a differential gear 5, an electric oil pump EOP, a mechanical oil pump MOP, a control valve CV, and the like.

[0023] In the power transmission device 1, the output rotation of the engine ENG (drive source) is input to the forward / reverse switching mechanism 2 via the torque converter T / C. The rotation input to the forward / reverse switching mechanism 2 is input to the primary pulley 31 of the variator 3, either in forward or reverse direction.

[0024] In the variator 3, by changing the winding radius of the belt 30 on the primary pulley 31 and the secondary pulley 32, the rotation input to the primary pulley 31 is shifted to a desired gear ratio and output from the output shaft 33 of the secondary pulley 32.

[0025] The output rotation of the secondary pulley 32 is input to the differential gear 5 (differential gear mechanism) via the reduction mechanism 4, and then transmitted to the drive wheels WH, WH via the left and right drive shafts 55A, 55B.

[0026] The reduction mechanism 4 includes 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 rotatably meshed with the output gear 41. The idler gear 42 is spline-fitted to the idler shaft 44 and rotates integrally with the idler shaft 44. The idler shaft 44 is provided with a reduction gear 43, which has a smaller diameter than the idler gear 42. The reduction gear 43 is rotatably meshed with the final gear 45, which is fixed to the outer circumference of the differential case 50 of the differential 5.

[0027] 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 axis) of the primary pulley 31. The output shaft 33 of the secondary pulley 32 and the output gear 41 are arranged coaxially on the rotation axis X2 (second axis) of the secondary pulley. The idler gear 42 and the reduction gear 43 are arranged coaxially on a common rotation axis X3 (third axis). The final gear 45 and the drive shafts 55A and 55B are arranged coaxially on a common rotation shaft X4 (fourth shaft). In the power transmission device 1, these rotation shafts X1 to X4 are set to be parallel to each other. Hereafter, these rotation shafts X1 to X4 will be collectively referred to as the rotation shaft X of the power transmission device 1 (power transmission mechanism) as needed.

[0028] Figure 3 is a plan view of case 6 as seen from the second cover 8 side. Note that in the enlarged view of Figure 3, the strainer 10 and the mechanical oil pump MOP are omitted from the illustration, and the area around the connection parts 625 and 627 provided in the partition wall 62 is shown.

[0029] As shown in Figure 3, the case 6 has a cylindrical peripheral wall portion 61 and a partition wall portion 62. The partition wall portion 62 is provided in the range that crosses the rotation axis (rotation axis X1 to rotation axis X4) of the power transmission mechanism. As shown in Figure 2, the partition wall 62 divides the space inside the peripheral wall 61 into two sections in the direction of the rotation axis X1. One side of the partition wall 62 in the direction of the rotation axis X1 is the first chamber S1, and the other side is the second chamber S2.

[0030] The first chamber S1 houses the forward / reverse switching mechanism 2, the reduction mechanism 4, and the differential 5. The second chamber S2 houses the variator 3. In case 6, the opening on the first chamber S1 side is sealed with the second cover 8 (torque converter cover). The opening on the second chamber S2 side is sealed with the first cover 7 (side cover). In Case 6, oil used for operating the power transmission device 1 and for lubricating the components of the power transmission device 1 is stored in the lower part of the space between the first cover 7 and the second cover 8 (first chamber S1, second chamber S2).

[0031] As shown in Figure 3, the end face of case 6 on the side facing the second cover 8 (the side closer to the viewer) forms a joint 611 with the second cover 8. The joint 611 is a flange-like portion that surrounds the entire circumference of the opening of the partition wall portion 62 on the second cover 8 side. The joint 811 on the second cover 8 side (see Figure 2) is joined to the joint 611 around its entire circumference. Case 6 and the second cover 8 are connected by bolts (not shown) with their respective joints 611 and 811 joined to each other. This keeps the opening of case 6 sealed by the second cover 8, forming a closed first chamber S1.

[0032] As shown in Figure 3, in case 6, the partition wall portion 62 is located inside the joint portion 611. The partition wall 62 of case 6 is provided in a direction approximately perpendicular to the rotation axis (rotation axis X1 to X4). The partition wall 62 is provided with through holes 621, 622, and 624, and a support hole 623. The through-hole 621 is formed around the rotation axis X1. On the side of the partition wall 62 facing the first chamber S1 (the side facing the viewer in the paper), a cylindrical support wall 631 surrounding the through-hole 621 and a peripheral wall 641 surrounding the outer circumference of the support wall 631 at intervals are provided. In Figure 3, the support wall 631 and the peripheral wall 641 protrude toward the viewer in the paper (the side facing the second cover 8 in Figure 2).

[0033] The region 651 between the support wall 631 and the peripheral wall 641 is a cylindrical space that houses the piston (not shown) of the forward / reverse switching mechanism 2, friction plates (forward clutch, reverse brake), and the like. The input shaft 34 of the primary pulley 31 (see Figure 2) is rotatably supported on the inner circumference of the support wall 631 via a bearing B.

[0034] As shown in Figure 3, the through hole 622 is formed around the rotation axis X2. In the power transmission device 1 mounted on vehicle V, the rotating shaft X2 is located diagonally above and to the rear of the vehicle when viewed from the rotating shaft X1.

[0035] On the side of the partition wall 62 facing the first chamber S1 (the side closer to the viewer on the paper), a cylindrical support wall 632 is provided that surrounds the through hole 622. In Figure 3, the support wall 632 protrudes toward the side closer to the viewer on the paper (the side facing the second cover 8 in Figure 2). The output shaft 33 of the secondary pulley 32 (see Figure 2) is rotatably supported on the inner circumference of the support wall 632 via a bearing B.

[0036] As shown in Figure 3, the support hole 623 is a bottomed hole formed around the rotation axis X3. In the power transmission device 1 mounted on vehicle V, the rotating shaft X3 is located diagonally above and to the rear of the vehicle when viewed from the rotating shaft X1, and diagonally below and to the rear of the vehicle when viewed from the rotating shaft X2.

[0037] On the side of the partition wall 62 facing the first chamber S1 (the side closer to the viewer in the paper), a cylindrical support wall 633 is provided that surrounds the support hole 623. In Figure 3, the support wall 633 protrudes toward the viewer in the paper (the side facing the second cover 8 in Figure 2). The support wall 633 surrounds the outer circumference of the support hole 623 with a gap between them. The idler shaft 44 of the reduction mechanism 4 (see Figure 2) is rotatably supported on the inner circumference of the support wall 633 via a bearing B.

[0038] As shown in Figure 3, the through hole 624 is formed with the rotation axis X4 as its center. In the power transmission device 1 mounted on vehicle V, the rotating shaft X4 is located diagonally downward on the rear side of the vehicle when viewed from rotating shaft X1, diagonally downward on the rear side of the vehicle when viewed from rotating shaft X2, and diagonally downward on the front side of the vehicle when viewed from rotating shaft X3.

[0039] On the side of the partition wall 62 facing the first chamber S1 (the side closer to the viewer in the paper), a cylindrical support wall 634 is provided that surrounds the through hole 624. In Figure 3, the support wall 634 protrudes toward the viewer in the paper (the side facing the second cover 8 in Figure 2). The support wall 634 surrounds the outer circumference of the through hole 624 with a gap between them. The differential case 50 (see Figure 2) of the differential gear 5 is rotatably supported on the inner circumference of the support wall 634 via a bearing B. As shown in Figure 2, a final gear 45, which forms a ring shape when viewed from the direction of the rotation axis X4, is fixed to the outer circumference of the differential case 50. The final gear 45 rotates together with the differential case 50 around the rotation axis X4.

[0040] As shown in Figure 3, on the side of the partition wall 62 facing the first chamber S1 (the side closest to the viewer), a baffle plate 66 is attached below the through hole 624. When viewed from the direction of the rotation axis X4, the baffle plate 66 has a semicircular shape with its curved surface facing downwards, and has a side plate portion 661 that covers both sides of the final gear 45 in the direction of the rotation axis X4, and an arc-shaped wall portion 662 that covers the outer circumference in the radial direction of the rotation axis X4 (see Figure 10). Note that in Figure 3, the illustration of the side plate portion 661 on the side closest to the viewer is omitted.

[0041] In case 6, the strainer 10 is located in the area of ​​the baffle plate 66 that is forward of the vehicle, and in the area below the aforementioned arc-shaped peripheral wall 641.

[0042] As shown in Figure 3, the partition wall 62 is provided with a connection part 625 for the strainer 10 and a connection part 627 for the mechanical oil pump MOP on the lower side of the peripheral wall 641. The connection port 625a of the connection part 625 and the connection port 627a of the connection part 627 open facing the same direction. The connection port 625a of the connection part 625 is connected to the oil passage 626 provided within the partition wall 62. The connection port 627a of the connection part 627 is connected to the oil passage 628 provided within the partition wall 62. Oil passages 626 and 628 extend linearly through the partition wall 62 toward the housing section 68 (right side in the figure). Oil passage 626 connects to the electric oil pump EOP (see Figure 2) housed in the housing chamber S3 via an oil passage within the case 6. Oil passage 628 connects to the control valve CV (see Figure 2) installed in the housing chamber S3 via an oil passage within the case 6.

[0043] As shown in Figure 2, the containment chamber S3 is located on the front side of the vehicle of case 6. A storage compartment 68 is attached to the front side of case 6, with its opening facing the front of the vehicle. The storage chamber S3 is formed by sealing the opening of the storage compartment 68 with the third cover 9. The storage section 68 and the third cover 9 are connected by bolts (not shown) with their joints 683 and 911 joined to each other. This forms a closed storage chamber S3 on the front side of the case 6. In containment chamber S3, the control valve CV and the electric oil pump EOP are arranged vertically.

[0044] As shown in Figure 2, the control valve CV has a basic configuration in which a separator 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 equipped with a solenoid that is driven based on a command from a control device (not shown), and a pressure regulating valve SP (spool valve) that is operated by the signal pressure generated by the solenoid.

[0045] Inside the containment chamber S3, the control valve CV is positioned vertically with the stacking direction of the valve bodies 921, 921 aligned with the vehicle's longitudinal direction (up and down direction on the paper). In the containment chamber S3, the control valve CV is mounted vertically so as to satisfy the following conditions: (a) Multiple pressure regulating valves SP (spool valves) within the control valve CV are aligned in the vertical direction VL (up and down direction) relative to the installation state of the power transmission device 1 on the vehicle V (see Figure 3); (b) The direction of forward and backward movement Xp of the pressure regulating valves SP (spool valves) is aligned with the horizontal direction (see Figure 3).

[0046] This ensures that the movement of the pressure regulating valve SP (spool valve) is not obstructed, while the control valve CV is positioned vertically within the housing chamber S3. Therefore, the housing chamber S3 is not enlarged in the longitudinal direction of the vehicle. The electric oil pump (EOP) is positioned vertically with the rotation axis of the motor (not shown) aligned along the vertical line VL. As shown in Figure 2, the electric oil pump EOP and the control valve CV are aligned in the direction of the rotation axis X of the power transmission mechanism.

[0047] Figure 4 is a plan view of the second cover 8 as seen from the case 6 side. In Figure 4, the second cover 8 is shown together with the charging pipe 200 attached to the case 6 side of the second cover 8. Figure 5 is a plan view of the second cover 8 as seen from the engine ENG side. In Figure 5, a partially cut-out torque converter T / C is superimposed to clearly show the extent of the torque converter T / C housed inside the first region 825.

[0048] As shown in Figure 4, the second cover 8 has a cylindrical peripheral wall portion 81 and a partition wall portion 82. The partition wall portion 82 is provided in a range that crosses the rotation axis (rotation axis X1 to rotation axis X4) of the power transmission mechanism. The peripheral wall portion 81 has an end face on the case 6 side (the side closer to the viewer) which serves as a joint portion 811 with the case 6. The joint portion 811 is a flange-like portion that surrounds the opening on the second cover 8 side of the partition wall portion 82 all the way around. In the second cover 8, the partition wall portion 82 is located inside the joint portion 811. The partition wall portion 82 is provided with through holes 821 and 824, and support holes 822 and 823. The partition wall 82 has a first region 825 and a second region 826. The first region 825 is a roughly circular region centered on the rotation axis X1. The first region 825 bulges out towards the front of the paper (towards the first chamber S1).

[0049] The through-hole 821, located approximately in the center of the first region 825, is formed around the axis of rotation X1. A cylindrical support wall portion 831 surrounding the through-hole 821 is provided on the surface of the partition wall portion 82 facing the first chamber S1 (the side closer to the viewer on the page).

[0050] The second region 826 is the region of the partition wall 82 excluding the first region 825. The second region 826 is provided with support holes 822 and 823 and a through hole 824. The support hole 822 is a bottomed hole formed around the rotation axis X2. In the second region 826, a cylindrical support wall portion 832 is provided surrounding the support hole 822. In Figure 4, the support wall portion 832 protrudes towards the front of the paper. The output shaft 33 of the secondary pulley 32 (see Figure 2) is rotatably supported on the inner circumference of the support wall portion 832 via a bearing B.

[0051] The support hole 823 is a bottomed hole formed around the rotation axis X3. In the second region 826, a cylindrical support wall portion 833 is provided surrounding the support hole 823. In Figure 4, the support wall portion 833 protrudes towards the front of the paper. The idler shaft 44 (see Figure 2) of the reduction mechanism 4 is rotatably supported on the inner circumference of the support wall portion 833 via bearing B.

[0052] The through-hole 824 is formed around the axis of rotation X4. In the second region 826, a cylindrical support wall portion 834 is provided surrounding the through-hole 824. In Figure 4, the support wall portion 834 protrudes towards the front of the paper. The differential case 50 (see Figure 2) of the differential gear 5 is rotatably supported on the inner circumference of the support wall portion 834 via bearing B.

[0053] As shown in Figure 4, in the first region 825, a recess 827 is formed on the front side of the vehicle. This recess 827 extends from the top of the second cover 8, across the horizontal line HL, to the lower side. A charging pipe 200 is provided in this recess 827. The charging pipe 200 is positioned along the vertical direction on the front side of the vehicle (left side in the figure) of the first region 825.

[0054] Figure 6 illustrates the arrangement of the charging pipe 200 in the second cover 8. Figure 6 schematically shows a cross-section of the second cover 8 cut along line AA in Figure 4. In Figure 6, the first region 825 and the second region 826 of the partition wall 82 are shown together with the cross-section of the case 6. As shown in Figure 6, the engine ENG side (left side in the figure) of the first region 825 is the torque converter T / C housing chamber S3. The first region 825 is curved to surround the radial side surface 120 of the rotation axis X1 of the torque converter T / C and the back surface 121 on the case 6 side with a gap between them. The front end 825a of the first region 825 is connected to the inner circumference of the peripheral wall portion 81.

[0055] At the end 825a of the first region 825, a curved portion 825b is formed that is recessed toward the containment chamber S3. The case 6 side (right side in the figure) of this curved portion 825b is a recess 827 in which the charging pipe 200 is placed. The recess 827 opens toward the first chamber S1. Here, the first chamber S1 formed between the case 6 and the second cover 8 is composed of a case-side region S1a inside the case 6 and a second cover-side region S1b inside the second cover 8. The recess 827 is located within the second cover-side region S1b. In this embodiment, the shape of the curved portion 825b defining the recess 827 is set such that the charging pipe 200, which is located in the recess 827, remains within the second cover side region S1b and does not bulge out into the case side region S1a.

[0056] Therefore, as shown in Figure 5, on the engine ENG side of the second cover 8, the area of ​​the curved portion 825b that forms the recess 827 bulges out towards the front of the paper. Furthermore, the height of the curved portion 825b bulging toward the front of the paper is set to a height that avoids interference with the torque converter T / C. When the torque converter T / C is placed inside the housing chamber S3, the area of ​​the curved portion 825b is hidden behind the torque converter T / C.

[0057] Figure 7 illustrates the arrangement of the charging pipe 200 between case 6 and second cover 8. Figure 7 schematically shows a cross-section of the second cover cut along line BB in Figure 4. Figure 8 illustrates the positional relationship between the tip 200a of the charging pipe 200, which serves as its outlet, and the side wall portion 162 of the baffle plate 160. Figure 8 shows the case 6 as viewed from the second cover 8 side, with the charging pipe 200 supported by the second cover 8 superimposed on it.

[0058] As shown in Figure 7, in the peripheral wall portion 81 located at the upper part of the second cover 8, a connecting portion 250 is provided in the region between the joint portion 811 on the case 6 side and the joint portion 812 on the engine ENG side. The connecting portion 250 is a cylindrical member that penetrates the peripheral wall portion 81 in the thickness direction. Inside the connecting portion 250, there is a communication hole 250a that connects the inside and outside of the second cover 8. The communication hole 250a opens on the upper surface of the peripheral wall portion 81 (see Figure 1).

[0059] As shown in Figure 7, the communication hole 250a is used as an insertion point for an oil level gauge (not shown). When the oil level gauge is not in use, the opening of the communication hole 250a is sealed with a plug (not shown).

[0060] The base end 200b of the charging pipe 200 is inserted into the communication hole 250a of the connection part 250 from inside the second cover 8. As shown in Figure 4, the charging pipe 200, viewed from the rotation axis X1, extends from the top of the second cover 8, beyond the horizontal line HL, to the bottom of the second cover 8.

[0061] As described above, a recess 827 is provided on the vehicle-front side of the first region 825. The recess 827 is slightly curved so that its approximately central part in the vertical direction bulges out toward the vehicle-front side. Therefore, the charging pipe 200 positioned within the recess 827 is curved such that the region between its base end 200b and tip end 200a bypasses the vehicle-front side of the first region 825.

[0062] Furthermore, the displacement of the region housed in the recess 827 of the charging pipe 200 in the vehicle's longitudinal direction is restricted by the curved portion 825b (see Figure 6) that forms the recess 827 in the first region 825.

[0063] As shown in Figure 4, holders 205, 205 are attached to the charging pipe 200 at the base end 200b and the tip end 200a. The holders 205, 205 are fixed to the second cover 8 with bolts (not shown). In other words, the charging pipe 200 is fixed to the second cover 8 at two points: one end in the longitudinal direction (base end 200b) and the other end (tip end 200a). In this state, as shown in Figure 7, the charging pipe 200 is located on the side of the second cover 8 beyond the joint interface (boundary line BL) between the case 6 and the second cover 8. In the first chamber S1 within the housing HS, the charging pipe 200 is located within the second cover side region S1b described above, and is not designed to bulge into the case side region S1a.

[0064] As shown in Figure 7, when viewed from the radial direction of the rotation axis X1, the tip 200a of the charging pipe 200 is located between the opposing region 825d in the first region 825 that faces the baffle plate 160 and the side wall portion 162 of the baffle plate 160. At the tip 200a of the charging pipe 200, displacement in the direction of the rotation axis X1 is suppressed by the opposing region 825d and the side wall portion 162.

[0065] At the lower part of the second cover 8, the lower end portion 825c of the first region 825 is provided with a gap between it and the peripheral wall portion 81 in the radial direction of the rotation axis X1. At the lower part of the second cover 8, an oil capture portion S4 is formed that extends to the lower part of the torque converter T / C. The oil capture unit S4 is located below the charging pipe 200 and is connected to the first chamber S1. On the case 6 side (right side in the figure) as viewed from the oil capture section S4, the mechanical oil pump MOP, driven by the rotation transmission mechanism 150, is located. The mechanical oil pump MOP is located within the case-side region S1a of the first chamber S1.

[0066] The rotational transmission mechanism 150 consists of a drive sprocket 151, a driven sprocket 152, and a chain 153. The drive sprocket 151 rotates around the rotation axis X1 with rotational driving force input via the pump impeller sleeve 155 of the torque converter T / C.

[0067] The rotation input to the drive sprocket 151 is transmitted to the driven sprocket 152 via the chain 153. The driven sprocket 152 rotates around the rotation axis X5 with the transmitted rotation. When the driven sprocket 152 rotates, the rotation axis of the mechanical oil pump MOP, to which the driven sprocket 152 is connected, rotates, and the mechanical oil pump MOP is driven. As a result, the oil OL stored at the bottom of case 6 is drawn in through the strainer 10 (see Figure 3).

[0068] A baffle plate 160 is provided between the mechanical oil pump MOP and the second cover 8. The baffle plate 160 is provided to suppress the agitation of the oil OL by the rotating driven sprocket 152. The baffle plate 160 consists of side wall portions 161 and 162 that cover both sides of the driven sprocket 152 in the direction of the rotation axis X5, and a peripheral wall portion 163 that covers the outer circumference of the lower side of the driven sprocket 152.

[0069] As shown in Figure 8, the side wall portion 162 completely covers the side surface of the driven sprocket 152. The peripheral wall portion 163 is provided in an area that covers the outer circumference of the lower side of the driven sprocket 152.

[0070] In the side wall portion 162, an extension portion 164 is provided at the upper part on the front side of the vehicle. The extension portion 164 extends diagonally upward in a forward direction along the tip 200a side of the charging pipe 200. When viewed from the direction of the rotation axis X1, the extension portion 164 is positioned in a location that overlaps with the area on the tip 200a side of the charging pipe 200. When the oil level gauge (not shown) is inserted into the charging pipe 200, the tip of the oil level gauge is inserted into the housing HS from the tip 200a of the charging pipe 200. At this time, the baffle plate 160 is provided so that the inserted oil level gauge does not interfere with the driven sprocket 152.

[0071] Furthermore, as shown in Figure 7, the tip 200a of the charging pipe 200 is located along the boundary line BL. The side wall portion 162 of the baffle plate 160 is located on the case 6 side of the boundary line BL. On the opposite side from case 6, there is an oil capture portion S4 that is recessed away from case 6. Therefore, the oil OL supplied from the tip 200a of the charging pipe 200 does not flow towards the driven sprocket 152, but instead flows quickly into the oil capture section S4.

[0072] Thus, since there is nothing obstructing the flow of oil OL on the extension of the tip 200a of the charging pipe 200, oil OL can be quickly injected into the housing HS using the charging pipe 200.

[0073] As described above, the vehicle power transmission device 1 according to this embodiment has the following configuration. (1) Power transmission device 1 is A power transmission mechanism (torque converter T / C, forward / reverse switching mechanism 2, variator 3, reduction mechanism 4, differential 5) that transmits the driving force of the engine ENG (drive source) to the drive wheels WH, WH, A housing HS that accommodates the power transmission mechanism, It includes a charging pipe 200 for guiding the oil level gauge into the housing HS. The charging pipe 200 is located inside the housing HS.

[0074] With this configuration, the charging pipe 200 is located inside the housing HS, thus limiting the size increase of the power transmission device that would occur if the charging pipe were located outside the housing HS.

[0075] (2) The power transmission mechanism includes a variator 3 (continuously variable speed mechanism) and a differential 5 (differential mechanism). The housing HS case 6 has a peripheral wall portion 61 (outer wall portion) that encloses the variator 3 and the differential gear 5, The peripheral wall portion 61 has a partition wall portion 62 that divides the space inside it into a second chamber S2 (space) on the variator 3 side and a first chamber S1 (space) on the differential gear 5 side. The charging pipe 200 is located in the first chamber S1.

[0076] Inside the housing HS, the second chamber S2 on the variator 3 side does not have enough space to lay out the charging pipe 200 vertically along the vertical line VL. The first chamber S1 on the differential gear 5 side has more space than the second chamber S2. In other words, by placing the charging pipe 200 on the side of the first chamber S1, where there is more space in the layout, the charging pipe 200 can be positioned while avoiding interference with the rotating elements that make up the power transmission mechanism. That is, it becomes easier to prevent interference between the charging pipe 200 and the rotating elements that make up the power transmission mechanism.

[0077] (3) Housing HS is, The case 6 has a second cover 8 (cover portion) that covers the opening on the differential gear 5 side in the peripheral wall portion 61 of the case 6. The charging pipe 200 is supported by the second cover 8.

[0078] When attempting to install the charging pipe 200 inside the peripheral wall 61 or bulkhead 62 where many components of the power transmission mechanism are located, care must be taken to avoid interference with each component when bolting or fastening the charging pipe 200. By attaching the charging pipe 200 to the second cover 8, the inconvenience of having to install the charging pipe 200 on the case 6 is eliminated. This improves the ease of assembling the charging pipe 200 to the housing HS.

[0079] (4) Cover 8 of the second page is A first region 825 (first wall portion) along the outer circumference of the torque converter T / C, It has a peripheral wall portion 81 (second wall portion) that surrounds the outer periphery of the first region 825 and is connected to the peripheral wall portion 61 of the case 6. The charging pipe 200 is positioned in the recess 827 (space) between the first region 825 and the peripheral wall portion 81.

[0080] Since no components of the power transmission mechanism or rotating parts are placed in the radial gap (recess 827) between the first region 825 and the peripheral wall portion 81, there is no need to worry about interference with these. Therefore, the ease of assembly of the charging pipe 200 in the housing HS can be improved.

[0081] (5) The recess 827 (space) between the first region 825 and the peripheral wall portion 81 is formed in a shape that follows the outer circumference of the torque converter T / C when viewed from the direction of the rotation axis X1 of the torque converter T / C. The recess 827 is connected to the first chamber S1 of case 6. The charging pipe 200 is positioned within the recess 827 between the first region 825 and the peripheral wall portion 81, oriented along a vertical line VL based on the installation state of the power transmission device 1 on the vehicle V. The charging pipe 200 extends from the top of the second cover 8, across the horizontal line HL passing through the rotation axis X1, to the lower side of the second cover 8.

[0082] With this configuration, the charging pipe 200 is arranged in an arc shape along the outer circumference of the torque converter T / C. When the oil level gauge is inserted into the charging pipe 200, the measuring part at the tip of the charging pipe 200 can be smoothly guided from the top of the housing HS to the bottom where the oil OL is stored.

[0083] (6) In the second cover 8, the radial displacement of the rotation axis X1 of the torque converter T / C is restricted by the first region 825 (first wall portion) and the peripheral wall portion 81 (second wall portion) of the charging pipe 200.

[0084] This configuration makes it possible to suppress the radial displacement of the rotation axis X1 of the charging pipe 200.

[0085] (7) The recess 827 (space) between the first region 825 and the peripheral wall portion 81 is connected to the first chamber S1 of case 6. In the second cover 8, the charging pipe 200 is supported in the section opposite the first chamber S1.

[0086] The first chamber S1 formed between case 6 and second cover 8 consists of a case-side region S1a, which is the space on the case 6 side, and a second cover-side region S1b, which is the space on the second cover 8 side. With the configuration described above, the charging pipe 200 is located in the second cover-side region S1b. The second cover-side region S1b is a separate space from the case-side region S1a in which the differential gear 5 is housed. This reduces the possibility of the charging pipe 200 interfering with components of the power transmission mechanism, such as the rotating bodies that make up the differential gear 5 or the reduction gear 4.

[0087] (8) The charging pipe 200 is a cylindrical member having openings at both ends. The tip 200a (one end) of the charging pipe 200 is located laterally to the rotation axis X5 of the driven sprocket 152, which is a rotating body located inside the case 6. The side wall portion 162 (plate) of the baffle plate 160 is positioned between the driven sprocket 152 and the tip 200a of the charging pipe 200.

[0088] With this configuration, interference between the oil level gauge protruding from the opening of the charging pipe 200 and the driven sprocket 152 can be prevented by the side wall portion 162.

[0089] (9) The base end 200b (other end) of the charging pipe 200 is open to the upper part of the peripheral wall portion 81 in the direction of the vertical line VL.

[0090] The base end 200b of the charging pipe 200 is connected to a connecting portion 250 which has a communication hole 250a that opens in the upper part of the peripheral wall portion 81. With the above configuration, the opening for inserting the oil level gauge is located at the top of the housing HS, making it easy to insert the oil level gauge into the charging pipe 200. Furthermore, the oil level gauge can be smoothly guided to the bottom of the housing where the oil OL is stored, and interference between the guided oil level gauge and the rotating body inside the housing HS can be prevented.

[0091] (10) The first region 825 (first wall portion) is, The driven sprocket 152 has a facing region 825d that faces the side wall portion 162 of the baffle plate 66 in the direction of the rotation axis X5. The region on the tip 200a side of the charging pipe 200 is restricted from displacement in the direction of the rotation axis X5 by the opposing region 825d and the side wall portion 162.

[0092] Since the displacement of the charging pipe 200 in the direction of the rotation axis X5 at the tip 200a can be restricted, vibration of the charging pipe 200 can be effectively prevented, and interference between the charging pipe 200 and surrounding parts can be appropriately prevented.

[0093] In the embodiment described above, the power transmission device 1 is shown as an example in which it transmits the rotation of the engine ENG to the drive wheels WH, WH. However, the power transmission device 1 may also transmit the rotation of at least one of the engine ENG and the motor (rotating electric) to the drive wheels WH, WH. For example, it may be a one-motor, two-clutch type power transmission device (a type in which a motor is placed between the engine ENG and the power transmission device, a first clutch is placed between the engine ENG and the motor, and a second clutch is placed inside the power transmission device 1). Furthermore, although the above-described embodiment illustrates a case where the power transmission device 1 has a speed change function, the power transmission mechanism may not have a speed change function and may simply reduce speed (or increase speed). If the power transmission device does not have a speed change function and is configured to reduce the rotation of the motor and transmit it to the drive wheels WH, WH, then the hydraulic control circuit for supplying the cooling oil OL for the motor and the lubricating oil OL for the reduction mechanism will be placed in the housing chamber S3 together with the electric oil pump EOP. Also, although the above-described embodiment illustrates a case where the control unit of the power transmission device 1 is equipped with a control valve CV, if the power transmission device 1 does not have a speed change mechanism and the drive source is a motor (rotating electricity) rather than an engine ENG, then the control unit may be equipped with an inverter or the like for driving and controlling the motor.

[0094] Although embodiments of the present invention have been described above, the present invention is not limited to the embodiments shown. It can be modified as appropriate within the scope of the technical idea of ​​the invention. [Explanation of Symbols]

[0095] 1. Power transmission device 2. Forward / reverse switching mechanism (power transmission mechanism) 3. Variator (continuously variable speed control mechanism, power transmission mechanism) 4. Reduction mechanism (power transmission mechanism) 5. Differential gear (differential mechanism, power transmission mechanism) 6 cases 61 Peripheral wall (outer wall) 62 Bulkhead 7. Cover 1 8. Second cover (cover section) 81 Peripheral wall (second wall) 82 Bulkhead 825 1st area (1st wall) 825d Opposing area 827 Recess (space between the first and second wall sections) 9. Third Cover S1 First chamber (space on the differential mechanism side) S2 Second chamber (space on the side of the continuously variable transmission mechanism) T / C Torque Converter (Power Transmission Mechanism) HS Housing 152 Driven sprocket (rotating body) 160 Baffle Plate (Plate) 200 Charging pipe (cylindrical member) 200a Tip (one end) 200b Base (other end)

Claims

1. A power transmission mechanism that transmits the driving force from the drive source to the drive wheels, A housing that accommodates the power transmission mechanism, The housing includes a charging pipe for guiding the oil level gauge into the housing, The aforementioned housing is The outer wall portion enclosing the aforementioned power transmission mechanism, It has a cover portion that covers the opening in the outer wall portion, The aforementioned cover portion is A first wall portion along the outer circumference of the torque converter, It has a second wall portion that surrounds the outer periphery of the first wall portion and is connected to the outer wall portion of the housing, The charging pipe is a power transmission device provided within the housing in the space between the first wall and the second wall.

2. In claim 1, The power transmission mechanism includes a continuously variable transmission mechanism and a differential mechanism. The aforementioned housing is The outer wall portion enclosing the continuously variable transmission mechanism and the differential mechanism, The outer wall portion has a partition wall portion that divides the space inside the outer wall portion into a space on the continuously variable transmission mechanism side and a space on the differential mechanism side, The charging pipe is a power transmission device located in the space on the differential mechanism side formed between the partition wall and the cover.

3. In claim 2, The charging pipe is a power transmission device supported by the cover portion.

4. In claim 2 or claim 3, The space between the first wall and the second wall is formed in a shape that follows the outer circumference of the torque converter when viewed from the direction of the rotation axis of the torque converter, and is connected to the space on the differential mechanism side. The charging pipe is arranged in the space between the first wall and the second wall in a direction along the vertical line with respect to the installation state of the power transmission device on the vehicle, in a power transmission device.

5. In any one of claims 2 to 4, The charging pipe is a power transmission device in which the radial displacement of the rotation axis of the torque converter is restricted by the first wall portion and the second wall portion.

6. In any one of claims 2 to 5, The space between the first wall and the second wall is connected to the space on the differential mechanism side. A power transmission device in which the charging pipe is supported in the cover portion opposite to the space on the differential mechanism side.

7. In any one of claims 2 to 6, The charging pipe is a cylindrical member having openings at both ends, One end of the charging pipe is located to the side of the rotating body disposed within the housing, A plate is positioned between the rotating body and one end of the charging pipe. Power transmission device.

8. In claim 7, The other end of the charging pipe is an opening in the upper part of the housing, which is a power transmission device.

9. In claim 8, The first wall portion is, The rotating body has a region facing the plate in the direction of its rotation axis, A power transmission device in which one end of the charging pipe is restricted from displacement in the direction of the rotation axis by the opposing region and the plate.

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