unit

Abstract

To ensure that oil is supplied efficiently to the meshing parts of the gears. [Solution] A unit comprising a power transmission mechanism comprising a first gear and a second gear that meshes with the first gear, a bearing that supports a shaft included in the power transmission mechanism, and a guide member that guides oil ejected from the bearing side toward the axial direction of the rotating shaft to the meshing portion between the first gear and the second gear.

Description

Technical Field

[0001] The present invention relates to a unit.

Background Art

[0002] Patent Document 1 discloses a structure for supplying oil to the meshing portion of gears using a nozzle.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In a unit having a structure for supplying this type of oil, as a whole unit, it is required to supply oil to the meshing portion of the gears without waste.

Means for Solving the Problems

[0005] One aspect of the present invention is a power transmission mechanism including a first gear and a second gear meshing with the first gear, a bearing supporting a shaft included in the power transmission mechanism, and a unit having a guide member that guides oil ejected from the bearing side to the axial side of the rotation axis to the meshing portion of the first gear and the second gear.

Effects of the Invention

[0006] According to one aspect of the present invention, oil can be supplied to the meshing portion of the gears without waste.

Brief Description of the Drawings

[0007] [Figure 1]Figure 1 is a diagram illustrating the unit. [Figure 2] Figure 2 is a diagram illustrating the arrangement of the guide members. [Figure 3] Figure 3 is a diagram illustrating the arrangement of the guide members. [Figure 4] Figure 4 is a diagram illustrating the arrangement of the guide members. [Figure 5] Figure 5 is a diagram illustrating the arrangement of the guide members. [Figure 6] Figure 6 is a diagram illustrating the guide member. [Figure 7] Figure 7 is a diagram illustrating the guide member. [Modes for carrying out the invention]

[0008] First, the definitions of terms used in this specification will be explained. A "unit" is also called a "motor unit," "power transmission device," etc. A motor unit is a unit that has at least a motor. A power transmission device is a device that has at least a power transmission mechanism, and the power transmission mechanism is, for example, a gear mechanism and / or a differential gear mechanism. A unit that has a motor and a power transmission mechanism belongs to both the concepts of a motor unit and a power transmission device.

[0009] A "housing" is a component that houses the motor, gears, and inverter. A housing consists of one or more cases. A "motor" is a rotating electric machine that has both electric motor and / or generator functions.

[0010] When it is stated that element B (part, component, etc.) is connected to element A (component, component, etc.), that element B (component, component, etc.) is connected downstream of element A (component, component, etc.), or that element B (component, component, etc.) is connected upstream of element A (component, component, etc.), it means that element A and element B are connected in a way that allows for power transmission. The power input side is the upstream side, and the power output side is the downstream side. In addition, element A and element B may be connected via other elements (clutch, other gear mechanisms, etc.).

[0011] "Overlapping in a given direction" means that multiple elements are aligned in a given direction, and is synonymous with "overlapping in a given direction." The "given direction" can be, for example, the axial direction, radial direction, direction of gravity, or vehicle travel direction (vehicle forward direction, vehicle reverse direction). If a drawing shows multiple elements (parts, sections, etc.) arranged in a predetermined direction, it can be assumed that the description in the specification includes a sentence explaining that they overlap when viewed in that predetermined direction.

[0012] "Not overlapping in a given direction" and "offset in a given direction" mean that multiple elements are not aligned in a given direction, and are equivalent to writing "not overlapping in a given direction" and "offset in a given direction." "Given direction" can be, for example, the axial direction, radial direction, direction of gravity, or vehicle travel direction (vehicle forward direction, vehicle reverse direction). If a drawing shows that multiple elements (parts, sections, etc.) are not aligned in a predetermined direction, it may be assumed that the description in the specification includes a statement explaining that they do not overlap when viewed in that predetermined direction.

[0013] The statement "In a given direction of view, element A (part, etc.) is located between element B (part, etc.) and element C (part, etc.)" means that when observed from a given direction, element A can be observed to be located between element B and element C. The "given direction" is, for example, the axial direction, radial direction, direction of gravity, vehicle travel direction (vehicle forward direction, vehicle reverse direction), etc. For example, if elements B, A, and C are arranged in this order along the axial direction, then in a radial view, element A can be said to be located between elements B and C. If the drawing shows that element A is located between elements B and C in a given direction, then it can be assumed that there is a sentence in the specification explaining that element A is located between elements B and C in a given direction.

[0014] When two elements (parts, components, etc.) overlap in the axial direction view, the two elements are coaxial.

[0015] The "axial direction" means the axial direction of the rotation axis of the parts constituting the unit. The "radial direction" means the direction perpendicular to the rotation axis of the parts constituting the unit. The parts are, for example, a motor, a gear mechanism, a differential gear mechanism, etc.

[0016] Hereinafter, embodiments in a certain aspect of the present invention will be described by taking the case of the unit 1 mounted on a vehicle as an example. FIG. 1 is a schematic diagram for explaining the unit 1 in a certain aspect of the present invention. In the following description, the longitudinal direction of the vehicle shown in FIG. 2, the vertical direction, and the vehicle width direction shown in FIG. 1 will be used to explain the positional relationship of each component of the unit 1 as necessary.

[0017] As shown in FIG. 1, the unit 1 has a motor 2, a speed reduction mechanism 3, a differential mechanism 4, and drive shafts 5 (5A, 5B). The speed reduction mechanism 3 and the differential mechanism 4 constitute a power transmission mechanism 6.

[0018] In the unit 1, along the transmission path of the output rotation of the motor 2, the speed reduction mechanism 3 (input gear 31, intermediate gear 32), the differential mechanism 4, and the drive shafts 5 (5A, 5B) are arranged side by side. The speed reduction mechanism 3 is connected downstream of the motor 2. The differential mechanism 4 is connected downstream of the speed reduction mechanism 3. The drive shafts 5 (5A, 5B) are connected downstream of the differential mechanism 4.

[0019] In the unit 1, the output rotation of the motor 2 is reduced by the speed reduction mechanism 3 and input to the differential mechanism 4, and then transmitted to the left and right drive wheels WH, WH of the vehicle on which the unit 1 is mounted via the drive shafts 5 (5A, 5B).

[0020] The housing HS of unit 1 includes a motor case 11 having a motor 2 housing (motor room Sa), and a cover 16 between it and the motor case 11 that forms a housing (gear room Sb) for the reduction mechanism 3 and the differential mechanism 4.

[0021] The motor case 11 has a first circumferential wall portion 12 that surrounds the outer circumference of the motor 2, and a second circumferential wall portion 13 that surrounds the area where the reduction mechanism 3 and the differential mechanism 4 are provided. The first circumferential wall portion 12 and the second circumferential wall portion 13 are adjacent in the direction of the rotation axis X1 of the motor 2. When viewed from the direction of the rotation axis X1, the first circumferential wall portion 12 overlaps with the area of ​​the second circumferential wall portion 13 on the vehicle rear side.

[0022] In the first circumferential wall 12, a partition wall 14 is provided at a position closer to the second circumferential wall 13 in the direction of the rotation axis X1. The partition wall 14 is provided in a direction perpendicular to the rotation axis X1. The partition wall 14 completely covers the opening on the gear chamber Sb side of the first circumferential wall 12. The internal space of the housing HS is divided into two sections by a partition wall 14 of the motor case 11.

[0023] In the partition wall 14, a through hole 140 and a support cylinder 141 surrounding the through hole 140 are provided in the region where it intersects with the rotation axis X1 of the motor 2. The through hole 140 penetrates the partition wall 14 in the thickness direction (direction of the rotation axis X1). The support cylinder 141 protrudes from the motor chamber Sa side (upper side in the figure) and the gear chamber Sb side (lower side in the figure) of the partition wall 14, respectively. The output shaft 20 of the motor 2 is rotatably supported on the inner circumference of the support cylinder 141 via a bearing B1.

[0024] Viewed from the direction of the rotation axis X1, the opening in the region of the second peripheral wall 13 that does not overlap with the motor chamber Sa is closed by the side wall 15. In the motor case 11, a bottomed cylindrical space surrounded by the second peripheral wall 13 opens at the part facing the cover 16.

[0025] The cover 16 has a side wall portion 17 that is sized to close the opening in the second peripheral wall portion 13, and a peripheral wall portion 18 that surrounds the outer circumference of the side wall portion 17 all around. In the cover 16, a bottomed cylindrical space surrounded by the peripheral wall portion 18 is opened at the part facing the motor case 11.

[0026] When viewed from the direction of the rotation axis X1, the peripheral wall portion 18 is formed in a shape that matches the second peripheral wall portion 13 on the motor case 11 side. When the peripheral wall portion 18 of the cover 16 is joined to the second peripheral wall portion 13 on the motor case 11 side from the direction of the rotation axis X1, a closed space (gear chamber Sb) is formed between the motor case 11 and the cover 16.

[0027] Inside the gear chamber Sb, the input gear 31 of the reduction mechanism 3 is positioned concentrically with the output shaft 20 of the motor 2. One end of the shaft 310 of the input gear 31 is connected to the output shaft 20 of the motor 2 in a way that prevents relative rotation. The other end of the shaft 310 is rotatably supported by a support portion 171 provided on the side wall portion 17 of the cover 16 via a bearing B1.

[0028] On the shaft 310 of the input gear 31, a transmission gear 311 is provided at a position closer to the partition wall 14. The transmission gear 311 is meshed with the large-diameter gear 321 of the intermediate gear 32 in a manner that allows for rotational transmission. The intermediate gear 32 has a shaft 320 that is oriented along the rotation axis X2. The rotation axis X2 is parallel to the rotation axis X1 of the motor 2 described above. One end of the shaft 320 in the longitudinal direction is rotatably supported by a support portion 142 provided on the partition wall 14 via a bearing B2. The other end of the shaft 320 in the longitudinal direction is rotatably supported by a support portion 172 provided on the side wall portion 17 of the cover 16 via a bearing B2.

[0029] On shaft 320, a small-diameter gear 322 is provided at a position offset from the large-diameter gear 321 toward the cover 16 side (downward in the figure). The small-diameter gear 322 has a smaller outer diameter than the large-diameter gear 321. The small-diameter gear 322 and the large-diameter gear 321 are mounted on the shaft 320 so as not to rotate relative to each other. In the intermediate gear 32, when rotation is transmitted from the transmission gear 311 to the large-diameter gear 321, the large-diameter gear 321 and the small-diameter gear 322 rotate together around a common rotation axis X2.

[0030] The small-diameter gear 322 meshes with the final gear FG on the differential mechanism 4 side in a manner that enables rotational transmission. In the differential mechanism 4, the final gear FG is fixed to the outer circumference of the differential case 40. The differential case 40 is a hollow member having an internal space capable of housing the pinion shaft 41, the pinion gears 42, 42, and the side gears 43, 43. Inside the differential case 40, the pinion shaft 41 is supported by the differential case 40 in a direction perpendicular to the rotation axis X3. The rotation axis X3 is parallel to the rotation axis X1 of the motor 2 mentioned above. The pinion shaft 41 rotatably supports the pinion gears 42, 42. The pinion gears 42, 42 rotate together with the differential case 40 around the rotation axis X1 as the differential case 40 rotates around the rotation axis X1.

[0031] Inside the differential case 40, the pinion gears 42, 42 and the side gears 43, 43 connected to the drive shafts 5A, 5B are meshed in a way that allows for rotational transmission. The differential mechanism 4 is composed of the differential case 40, pinion gears 42, 42, and side gears 43, 43.

[0032] In the differential case 40, cylindrical support portions 401 and 402 are provided on both sides in the direction of the rotation axis X3 (left and right direction in the figure). The support portions 401 and 402 extend along the rotation axis X3 in a direction away from the pinion shaft 41.

[0033] The support portion 401 extends toward the side wall portion 15 (upper side in the figure). In the side wall portion 15, a through hole 150 and a support cylinder 153 surrounding the through hole 150 are provided in the region intersecting with the rotation axis X3. The through hole 150 penetrates the side wall portion 15 in the thickness direction (direction of the rotation axis X3). The support portion 401 on the differential case 40 side is rotatably supported on the inner circumference of the support cylinder 153 via a bearing B3. Furthermore, a lip seal RS is provided on the inner circumference of the support cylinder 153. The lip seal RS is located on the outside of the bearing B3.

[0034] The support portion 402 extends from the side wall portion 17 (lower side in the figure) of the cover 16. In the side wall portion 17, a through hole 170 and a support cylinder 173 surrounding the through hole 170 are provided in the region intersecting with the rotation axis X3. The through hole 170 penetrates the side wall portion 17 in the thickness direction (direction of the rotation axis X3). The support cylinder 173 protrudes from the outer circumference of the side wall portion 17 along the rotation axis X3. The support portion 402 on the differential case 40 side is rotatably supported on the inner circumference of the support cylinder 173 via a bearing B3. Furthermore, a lip seal RS is provided on the inner circumference of the support cylinder 173. The lip seal RS is located on the outside of the bearing B3.

[0035] Figures 2 to 5 illustrate the arrangement of the guide member 7 in the gear chamber Sb. Figure 2 schematically shows the positional relationship between the rotating elements (input gear 31, intermediate gear 32, final gear FG, differential case 40) arranged in the gear chamber Sb and the guide member 7, as viewed from the cover 16 side. In Figure 2, to make the positions of the second circumferential wall portion 13 of the motor case 11 and the support cylinder 153 of the side wall portion 15 easier to understand, intersecting hatching is added to the end faces of the second circumferential wall portion 13 and the support cylinder 153 on the near side of the paper. In Figure 2, the outer diameters of the rotating elements (input gear 31, intermediate gear 32, final gear FG, differential case 60) arranged in the gear chamber Sb are shown by dashed lines. In Figure 2, the positions of the bearing B3 supported on the inner circumference of the support cylinder 153, the support portion 401 of the differential case 40, and the baffle plate 8 are shown by dashed lines.

[0036] In Figure 3, the positional relationship between the rotating elements (final gear FG, differential case 40) located within the gear chamber Sb and the guide member 7 is schematically shown in a cross-section along line AA in Figure 2. Figure 4 shows the positional relationship between the rotating elements (input gear 31, intermediate gear 32, final gear FG, differential case 60) located within the gear chamber Sb and the guide member 7, as viewed from the direction of arrow BB in Figure 2. In Figure 5, the positional relationship between the meshing portion of the small-diameter gear 322 and the final gear FG, and the tip 72a of the pipe portion 72 of the guide member 7 is schematically shown in a cross-section along line AA in Figure 4.

[0037] As shown in Figure 2, inside the gear chamber Sb, the input gear 31, the intermediate gear 32, and the final gear FG are arranged in this order from the rear to the front of the vehicle. The rotation axis X2 of the intermediate gear 32 is located above the rotation axis X1 of the input gear 31 and the rotation axis X3 of the final gear FG. The rotation axis X3 of the final gear FG is located below the rotation axis X1 of the input gear 31. As shown in Figure 4, when viewed from below in the vertical direction, the transmission gear 311 and the large-diameter gear 321 of the intermediate gear 32 are positioned so that they partially overlap. The small-diameter gear 322 of the intermediate gear 32 and the final gear FG are positioned so that they partially overlap.

[0038] As shown in Figure 2, within the gear chamber Sb, the support cylinder 153 is located on the far side of the plane of the final gear FG. The support portion 401 of the differential case 40 is supported on the inner circumference of the support cylinder 153 via the bearing B3. As shown in Figure 3, the inner circumference of the support cylinder 153 is provided with a discharge groove 153a that bypasses the outer circumference of the bearing B3. The discharge groove 153a extends along the inner circumference of the support cylinder 153 in the direction of the rotation axis X3 and opens at the end 153b of the support cylinder 153.

[0039] In the support section 401, a lip seal RS is provided on the outside of the bearing B3 as viewed from the differential case 40. The lip seal RS seals the gap between the outer circumference of the support section 401 and the inner circumference of the support cylinder 153. The lip seal RS is provided with a gap in the direction of the rotation axis X3 between it and the bearing B3. An oil hole 154 is opened between the lip seal RS and the bearing B3 on the inner circumference of the support cylinder 153.

[0040] Oil discharged by an oil pump OP (not shown) is supplied to the oil hole 154. As a result, oil is supplied from the oil hole 154 between the lip seal RS and the bearing B3, lubricating the bearing B3. The oil OL that lubricated the bearing B3 is discharged into the gear chamber Sb from between the inner race B3a and outer race B3b of the bearing B3. Furthermore, a portion of the oil OL supplied from the oil hole 154 is discharged into the gear chamber Sb through the discharge groove 153a, which bypasses the outer circumference of the bearing B3.

[0041] Lubricating oil OL is stored in the lower part of the gear chamber Sb. When the vehicle equipped with unit 1 is running, the oil OL stored in the lower part of the gear chamber Sb is scraped up by the differential case 40 and the final gear FG which rotate around the rotation axis X3. A baffle plate 8 is provided in the lower part of the gear chamber Sb, covering the outer circumference of the lower side of the final gear FG. The baffle plate 8 is a cover member formed by assembling a first member 81, which is positioned on one side of the final gear FG in the direction of the rotation axis X3, and a second member 82, which is positioned on the other side, in the direction of the rotation axis X3. The first member 81 is a plate-shaped member positioned on the support cylinder 153 side (left side in the figure) when viewed from the final gear FG. The first member 81 is provided in a direction perpendicular to the rotation axis X3. The first member 81 is sized to cover the area below the support portion 402 of the differential case 40. When viewed from the direction of the rotation axis X3, it has a roughly fan shape (see Figure 2).

[0042] The second member 82 is positioned on the side of the support cylinder 173 (right side in the figure) when viewed from the final gear FG. The second member 82 is an integral part having a side wall portion 821 that covers the area below the support portion 401 of the differential case 40 and a peripheral wall portion 822 that covers the outer circumference of the final gear FG.

[0043] When the first member 81 and the second member 82 are assembled in the direction of the rotation axis X3, the outer circumference of the lower region of the final gear FG and both sides in the direction of the rotation axis X3 are covered by the baffle plate 8. The baffle plate 8 is provided to suppress foaming of the oil OL caused by the rotation of the final gear FG by reducing the contact area between the final gear FG and the oil OL.

[0044] A guide member 7 is provided inside the gear chamber Sb. The guide member 7 is provided to capture the oil OL discharged from the support cylinder 153 in the direction of the rotation axis X3 and to supply the captured oil OL to the gear meshing portion.

[0045] Figures 6 and 7 illustrate the guide member 7. Figure 6 is a perspective view of the guide member 7 as seen from the support cylinder 153 side. Figure 7 schematically shows a cross-section of the guide member cut along plane A in Figure 6.

[0046] As shown in Figure 2, the guide member 7 is an integrated component having an oil-catching portion 71 and a pipe portion 72 through which the oil flows. For example, the guide member 7 is made of the same material as the housing HS or a heat-resistant resin material.

[0047] As shown in Figures 6 and 7, the capturing portion 71 has a peripheral wall portion 711, a diameter reduction portion 712, and a connecting portion 713. The reduced diameter section 712 is the part that connects the peripheral wall section 711 and the connecting section 713. The reduced diameter section 712 is inclined such that its inner diameter R712 decreases as it moves away from the peripheral wall section 711. The peripheral wall section 711, the reduced diameter section 712, and the connecting section 713 are arranged concentrically on a common center line C7. The connecting portion 713 is a bottomed cylindrical shape with its opening 713a facing the peripheral wall portion 711. The connecting portion 713 is connected to the end of the reduced diameter portion 712 opposite to the peripheral wall portion 711, with its opening 713a facing the reduced diameter portion 712. The opening 713a of the connecting portion 713 is formed with an inner diameter R713 that is smaller than the inner diameter R711 of the peripheral wall portion 711.

[0048] The pipe section 72 is connected to the outer circumference of the connecting section 713 from a direction perpendicular to the center line C7. A connection port 713b for connecting to the pipe section 72 is provided on the outer circumference of the connecting section 713. The internal space S1 of the connecting section 713 is in communication with the connecting passage 720, which is the internal space of the pipe section 72, via the connection port 713b. The internal space S1 of the connecting portion 713 is in communication with the substantially conical space S2, which is surrounded by the peripheral wall portion 711 and the reduced diameter portion 712, via the opening 713a.

[0049] The pipe section 72 is a tubular member. Inside the pipe section 72, there is a connecting passage 720 that extends from the connection port 713b to the tip 72a (see Figure 5).

[0050] As shown in Figures 3 and 4, in this embodiment, the capture portion 71 of the guide member 7 is supported by the first member 81 (side plate portion 811) of the baffle plate 8 via the holder 85. As shown in Figure 3, the holder 85 positions the capturing portion 71 below the rotation axis X3, with its opening facing diagonally upward toward the support cylinder 153. Therefore, when viewed from the direction of the rotation axis X3, the capturing part 71 overlaps with the support cylinder 153 and the bearing B3. When viewed from the direction of the rotation axis X3, the capturing part 71 is positioned in a positional relationship that overlaps with the support cylinder 153 and the bearing B3.

[0051] As described above, in the region where the support cylinder 153 is provided, the oil OL that lubricated the bearing B3 and the oil OL that bypasses the outer circumference of the bearing B3 are discharged in the direction of the rotation axis X3. Therefore, by positioning the capture unit 71 opposite the support cylinder 153 and the bearing B3 in the direction of the rotation axis X3, a large portion of the oil OL discharged in the direction of the rotation axis X3 can be captured by the capture unit 71.

[0052] The oil OL that flows into the inside of the capture section 71 from the direction of the rotation axis X3 moves along the inner circumference of the reduced diameter section 712 and collects at the connecting section 713 (see Figure 7). The oil OL that has collected at the connecting section 713 flows into the connecting passage 720 in the pipe section 72 through the connection port 713b.

[0053] As shown in Figures 4 and 5, the pipe section 72 extends in a direction perpendicular to the rotation axis X3, and then bends toward the meshing portion between the final gear FG and the small-diameter gear 322. The tip 72a of the pipe section 72 is supported by a support beam 86 extending from the second member 82 (circumferential wall portion 822) of the baffle plate 8. In this state, the tip 72a of the pipe section 72 is positioned opposite the meshing portion between the final gear FG and the small-diameter gear 322.

[0054] Therefore, the oil OL captured in the capture section 71 flows into the pipe section 72, and from the tip 72a of the pipe section 72, it is supplied to the meshing section between the final gear FG and the small diameter gear 322, and used to lubricate the final gear FG and the small diameter gear 322.

[0055] Furthermore, as shown by the dashed line in Figure 1, the pipe section 72 may be extended to the meshing portion between the large-diameter gear 321 and the transmission gear 311 to lubricate both the large-diameter gear 321 and the transmission gear 311. Alternatively, the pipe section 72 may be branched midway to lubricate both the meshing portion between the final gear FG and the small-diameter gear 322, and the meshing portion between the large-diameter gear 321 and the transmission gear 311.

[0056] As described above, Unit 1 in a certain embodiment of the present invention has the following configuration. (1) A power transmission mechanism 6 comprising a small diameter gear 322 (first gear) and a final gear FG (second gear) that meshes with the small diameter gear 322, A bearing B3 supports the support portion 401 of the differential case 40, which is one of the shafts included in the power transmission mechanism 6, The differential case 40 has a guide member 7 that guides the oil OL, which is ejected from the bearing B3 side towards the axial side of the rotating shaft X, to the meshing portion between the small diameter gear 322 and the final gear FG.

[0057] For example, the bearing B3 may be lubricated by supplying oil OL to the back side of the bearing B3 as viewed from the differential case 40. In this case, the oil OL that lubricated the bearing B3 may traverse the area where the bearing B3 is located on the axial side of the rotating shaft X3 and be ejected into the unit 1 (inside the gear chamber Sb). The ejected oil OL is guided by the guide member 7 to the meshing area between the small-diameter gear 322 and the final gear FG, thereby allowing the ejected oil OL to be effectively utilized for lubrication of the gear meshing area. This provides a configuration for the entire unit 1 that allows for the efficient supply of oil OL to the gear meshing parts.

[0058] The shaft can be any of the following: the support part 401 (shaft) that rotates integrally with the final gear FG (first gear), the shaft 320 that rotates integrally with the small diameter gear 322 (second gear) of the intermediate gear 32, or the shaft 310 that rotates integrally with the transmission gear 311 (other gears) of the input gear 31; it is not limited to a specific shaft.

[0059] Therefore, (I) The guide member 7 may capture the oil OL that is ejected axially from the bearing B2 supporting the shaft 320 of the intermediate gear 32 and supply it to the meshing portion between the final gear FG and the small diameter gear 322. (II) The guide member 7 may capture the oil OL ejected axially from the bearing B1 supporting the shaft 310 of the input gear 31 and supply it to the meshing portion between the final gear FG and the small diameter gear 322. Furthermore, the destination of the captured oil OL is not limited to the meshing portion between the final gear FG and the small diameter gear 322. For example, (III) the captured oil OL may be supplied to the meshing portion between the large-diameter gear 321 of the intermediate gear 32 and the transmission gear 311 of the input gear 31.

[0060] (2) The guide member 7 has a conical portion (catching portion 71) that opens in the axial direction of the rotating shaft X3 so as to face the bearing B3.

[0061] According to one aspect of the present invention, the oil OL is ejected so as to scatter in the axial direction of the rotating shaft X3. Therefore, by providing a capture unit 71 having a weight-shaped reduced-diameter portion 712 whose inner diameter R712 increases as it approaches the bearing B3, more oil OL can be collected and supplied to the gear meshing portions (such as the meshing portion between the final gear FG and the small-diameter gear 322, or the meshing portion between the large-diameter gear 321 and the transmission gear 311).

[0062] (3) The baffle plate 8 has a final gear FG (second gear) and a side plate portion 811 (axial side plate portion) that faces the rotation axis X3 in the axial direction. The guide member 7 is fixed to the baffle plate 8.

[0063] According to one aspect of the present invention, the baffle plate 8 (side plate portion 811) covering the lower region of the side surface of the final gear FG is positioned opposite the bearing B3 in the axial direction of the rotating shaft X3. Therefore, by supporting the guide member 7 on the baffle plate 8, the gripping portion 71 (conical portion) of the guide member 7, and the opening of the gripping portion 71, can be appropriately positioned to face the bearing B3 from the axial direction of the rotating shaft X3. This allows the guide member 7 to capture much of the oil OL discharged from bearing B3 in the axial direction of the rotating shaft X3 and supply it to the gear meshing area. Furthermore, using the baffle plate 8 makes it easier to provide a fixing point for the guide member 7 near the bearing B3, which is preferable.

[0064] (4) The guide member 7 has a conical portion (capture portion 71) that opens to face the bearing B3 in the axial direction of the rotating shaft X3, and a pipe portion 72 that connects to the capture portion 71. The baffle plate 8 has a circumferential wall portion 822 (tooth surface side plate portion) that faces the tooth surface of the final gear FG in the radial direction of the rotation axis X3. The capturing section 71 is fixed to the side plate section 811. The pipe section 72 is fixed to the peripheral wall section 822.

[0065] According to one aspect of the present invention, the guide member 7 is fixed to the baffle plate 8 at two locations: the holder 85 and the support beam 86. This firmly fixes the guide member 7 to the baffle plate 8, making it less prone to wobbling. If the guide member 7 becomes loose, it may interfere with a rotating body such as a gear, but by suppressing the wobbling, the possibility of the guide member 7 interfering with a rotating body such as a gear can be reduced.

[0066] Although embodiments of the present invention have been described above, these embodiments are merely examples of how the present invention can be applied, and are not intended to limit the technical scope of the present invention to the specific configurations of these embodiments. Modifications can be made as appropriate within the scope of the technical concept of the invention. [Explanation of Symbols]

[0067] 1: Unit 6: Power transmission mechanism 7: Guide member 8: Baffle plate 71: Capture part (cone-shaped part) 72: Pipe section 322: Small diameter gear (1st gear) 401: Support part (shaft) 811: Side plate section (axial side plate section) 822: Peripheral wall portion (tooth surface side plate portion) B3: Bearing FG: Final Gear (Second Gear)

Claims

1. A power transmission mechanism comprising a first gear and a second gear that meshes with the first gear, A bearing that supports the shaft included in the power transmission mechanism, A unit having a guide member that guides oil ejected from the bearing side toward the axial direction of the rotating shaft to the meshing portion between the first gear and the second gear.

2. In claim 1, The guide member is a unit having a conical portion that opens so as to face the bearing in the axial direction.

3. In claim 1, The baffle plate has an axial-side plate portion that faces the second gear in the axial direction, The unit is fixed to the baffle plate by the guide member.

4. In claim 3, The guide member has a conical portion that opens to face the bearing in the axial direction, and a pipe portion that connects to the conical portion. The baffle plate has a tooth surface side plate portion that faces the tooth surface of the second gear, A unit in which the conical portion is fixed to the axial-side plate portion and the pipe portion is fixed to the tooth-side plate portion.

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