JP2020045938A - Lubrication oil supply device - Google Patents

Abstract

To provide a lubrication oil supply device capable of easily supplying lubrication oil to a component on an upper section of a vertically arranged rotary shaft.SOLUTION: A lubrication oil supply device comprises: a case which is mounted on a vehicle and stores lubrication oil therein; and rotary shafts 13 and 21 which are arranged in the case so as to be rotatable around vertical shaft center lines CL1 and CL2. Spiral shafts 51 and 52 are respectively pressed into the rotary shafts 13 and 21. The spiral shafts 51 and 52 respectively have: opening faces 511b and 521b positioned lower than surfaces of lubrication oil PL1 and OL2; hole sections 511c and 521c which are formed by drilling the spiral shafts from the opening faces 511b and 521b along the shaft center lines CL1 and CL2 with inner peripheral surfaces thereof provided with spiral groove sections 514 and 524; and lubrication oil outlet sections 511a and 521a which discharge the lubrication oil, brought up along the groove sections 514 and 524 by rotations of the rotary shafts 13 and 21, out of the holes 511c and 521c.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a lubricating oil supply device mounted on a vehicle.

  2. Description of the Related Art As a device of this type, a device that supplies lubricating oil stored below a rotating shaft to a rotating shaft horizontally disposed in a gear box of a vehicle has been conventionally known (Japanese Patent Application Laid-Open No. H10-163873). 1). In the device described in Patent Literature 1, the lubricating oil stored in the gear box is scraped up by rotation of a gear, guided to a lubricating oil storage space inside the rotating shaft, and further stored through a lubricating oil discharge hole. Supply lubricating oil from the space to bearings.

JP 2017-214952 A

  However, when the rotating shaft is disposed in the vertical direction, the lubricant cannot be scraped up as in the device described in Patent Document 1, and it is difficult to supply the lubricant to the bearings and the like above the rotating shaft. is there.

  A lubricating oil supply device according to one embodiment of the present invention includes a case mounted on a vehicle, in which lubricating oil is stored, and a rotating body rotatably arranged around a vertical axis in the case. Prepare. The rotating body has an opening surface located below the oil level of the lubricating oil, a hole formed along the axis from the opening surface, and a helical groove formed in the inner peripheral surface, and a rotation of the rotating body. And an oil outlet for discharging the lubricating oil rising along the groove to the outside of the hole.

  ADVANTAGE OF THE INVENTION According to this invention, lubricating oil can be easily supplied to the upper part of the rotating shaft arrange | positioned in the vertical direction.

FIG. 1 is a diagram showing a main configuration of a vehicle drive device to which a lubricating oil supply device according to an embodiment of the present invention is applied. FIG. 1 is an exploded perspective view of a vehicle drive device to which a lubricating oil supply device according to an embodiment of the present invention is applied. FIG. 2 is a side view showing an example of mounting the vehicle drive device of FIG. 1 on a vehicle. FIG. 3 is a perspective view of a housing constituting the vehicle drive device of FIG. 2. FIG. 3 is a cross-sectional view illustrating a configuration of a main part of the vehicle drive device in FIG. 2 in an assembled state. FIG. 3 is a perspective view of a lower case constituting the vehicle drive device of FIG. 2. FIG. 5 is a bottom view of the housing of FIG. 4. The perspective view of the spiral shaft which constitutes the lubricating oil supply device concerning the embodiment of the present invention. FIG. 5 is a sectional view of the housing of FIG. 4. FIG. 10 is an essential part cross-sectional view of the vehicle drive device showing the configuration of the end of the oil passage in FIG. The perspective view of the filter unit of FIG. The figure which shows an example of the flow of the lubricating oil by the lubricating oil supply apparatus which concerns on embodiment of this invention.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a cross-sectional view showing a main configuration of a vehicle drive device 100 to which a lubricating oil supply device according to an embodiment of the present invention is applied, and FIG. 2 is an exploded perspective view thereof. FIG. 1 mainly shows the configuration of components that transmit power, and illustration of a case and the like is omitted.

  As shown in FIGS. 1 and 2, the vehicle drive device 100 includes an electric motor 1 as an example of a rotating electric machine, and transmits a traveling drive torque using the electric motor 1 as a drive source to drive wheels of the vehicle. Therefore, the vehicle drive device 100 is mounted on a vehicle having the electric motor 1 as a traveling drive source, such as an electric vehicle or a hybrid vehicle. In addition, the electric motor 1 can also be used as a generator.

  FIG. 3 is a side view showing an example of mounting the vehicle drive device 100 on a vehicle. Here, an example is shown in which the vehicle drive device 100 is disposed between the left and right front wheels 103 and is used as a front wheel drive device. Note that the vehicle drive device 100 may be disposed between the left and right rear wheels 104 and used as a rear wheel drive device.

  As shown in FIG. 3, the vehicle drive device 100 is disposed near the bottom surface of the vehicle body and at the center in the left-right direction of the vehicle. As a result, the position of the hood of the vehicle can be lowered, and the superiority in design and the like can be increased. Although not shown, the vehicle drive device 100 can be easily arranged below the seat and between the left and right rear wheels 104 without raising the floor surface in the vehicle, that is, without sacrificing the riding space in the vehicle. And the degree of freedom of arrangement of the vehicle drive device 100 is high.

  Hereinafter, the vehicle drive device 100 will be described using the front-rear direction (vehicle length direction), the up-down direction (vehicle height direction), and the left-right direction (vehicle width direction) of the vehicle in a state where the vehicle drive device 100 is mounted on the vehicle. The configuration of each unit will be described.

  As shown in FIG. 1, a vehicle drive device 100 includes an electric motor 1, a rotating body 2 disposed in front of the electric motor 1 (strictly, diagonally forward left), and a rotating body further disposed in front of the rotating body 2. And 3. That is, the vehicle drive device 100 includes the electric motor 1, the rotator 2, and the rotator 3 arranged side by side in the front-rear and left-right directions.

  The electric motor 1 includes a rotor 11 that rotates about an axis CL1 in the vertical direction, and a stator 12 that is arranged around the rotor 11. The electric motor 1 is, for example, an embedded magnet synchronous motor, and a plurality of permanent magnets in the circumferential direction are embedded in the rotor 11 (rotor core). Note that a synchronous reluctance motor or a switched reluctance motor having no magnet can be used as the electric motor 1.

  The stator 12 has a substantially cylindrical stator core centered on the axis CL1 and arranged from the outer peripheral surface of the rotor 11 (rotor core) via a gap having a predetermined length in the radial direction. The stator core is a stator core, and a plurality of slots in the circumferential direction are provided on the inner circumferential surface toward the outside in the radial direction, and windings (coils) are arranged in each slot by concentrated winding or distributed winding. When a three-phase alternating current flows through the winding, a rotating magnetic field is generated, and the rotor 11 rotates.

  A first rotating shaft 13 is arranged inside the rotor 11 of the electric motor 1 along the axis CL1. The first rotating shaft 13 is coupled to the rotor 11 by, for example, spline coupling, and rotates integrally with the rotor 11. The upper end of the first rotating shaft 13 projects from the upper end surface of the rotor 11, and a first gear 14 having a smaller diameter than the rotor 11 is provided at the upper end. The first gear 14 is coupled to the first rotating shaft 13 by, for example, spline coupling, and rotates integrally with the first rotating shaft 13. Note that the first gear 14 can also be formed on the outer peripheral surface of the first rotating shaft 13. The first gear 14 is composed of, for example, a spur gear or a helical gear.

  The rotating body 2 has a second rotating shaft 21 extending around the vertical axis CL2. A second gear 22 is provided at an upper end of the second rotating shaft 21. The second gear 22 is connected to the second rotating shaft 21 by, for example, a spline connection, and rotates integrally with the second rotating shaft 21. Note that the second gear 22 can be formed on the outer peripheral surface of the second rotating shaft 21.

  Like the first gear 14, the second gear 22 is formed of, for example, a spur gear or a helical gear, and the first gear 14 and the second gear 22 mesh with each other. The diameter of the second gear 22 is larger than the diameter of the first gear 14, and the first gear 14 and the second gear 22 mesh with each other above the rotor 11 (inner side than the inner peripheral surface of the stator 12). By configuring the second gear 22 to have a larger diameter than the first gear 14, the reduction ratio is increased, and the transmission torque from the first rotating shaft 13 to the rotating body 2 can be increased.

  A worm 23 constituting a worm gear is provided on the second rotating shaft 21 below the second gear 22 and beside the electric motor 1. The worm 23 is a screw-shaped gear in which teeth are continuously formed in a spiral shape. The worm 23 is coupled to the second rotation shaft 21 by, for example, a spline connection, and rotates integrally with the second rotation shaft 21. The worm 23 can be formed on the outer peripheral surface of the second rotating shaft 21.

  The worm 23 meshes with a worm wheel (helical gear) 32 that is rotatable about a left-right axis CL3. The worm wheel 32 is disposed below the second gear 22. The worm wheel 32 constitutes the rotating body 3 together with the third rotating shaft 31 extending along the axis CL3. The rotator 3 forms a differential mechanism, and the power input via the worm wheel 32 is transmitted to the left and right front wheels 103 via the third rotation shaft 31, whereby the vehicle travels. The third rotating shaft 31 is located at substantially the same height as the vertical center of the electric motor 1.

  As shown in FIG. 2, the vehicle drive device 100 includes a housing 41, an upper case 42 fastened to the upper surface of the housing 41 by bolts 42a, and a lower case 43 fastened to the lower surface of the housing 41 by bolts 43a. . The housing 4, the upper case 42, and the lower case 43 constitute a case 4 as a whole. A housing space SP is formed inside the case 4, and the motor 1, the rotating body 2, and the rotating body 3 are housed in the housing space SP. Thereby, the vehicle drive device 100 is configured as a vehicle drive unit in which drive components are accommodated in the case 4. FIG. 2 shows a state in which the rotating body 2 is assembled in a state in which the electric motor 1 and the rotating body 3 are assembled in the case 4 first.

  FIG. 4 is a perspective view (a view from obliquely above) of the housing 41. As shown in FIGS. 2 and 4, the housing 41 includes a first housing part 411 having a substantially cylindrical shape, a second housing part 412 protruding leftward from the first housing part 411, and a second housing part 412. And a third housing portion 413 protruding forward from the portion 412. The upper surfaces of the first housing portion 411 and the second housing portion 412 are formed on the same plane, and the upper surface is provided with an opening 41a. Openings 41b are provided on the lower surfaces of the second housing part 412 and the third housing part 413. A seat surface 411a for attaching a hydraulic pump is provided on an outer peripheral surface of a left rear end portion of the first housing portion 411.

  When assembling the vehicle drive device 100, after the rotating body 3 is inserted into the third housing portion 413 via the opening 41b, the lower case 43 is attached to the lower surface of the housing 41 to close the opening 41b. Further, the electric motor 1 is inserted into the first housing part 411 through the opening 41a, and the rotating body 2 is inserted into the second housing part 412 through the opening 41a. Thereafter, the upper case 42 is attached to the upper surface of the housing 41 to close the opening 41a.

  At this time, as shown in FIG. 2, the second rotating shaft 21 is rotatably supported by the upper case 42 and the lower case 43 by a pair of upper and lower bearings 24, 25. The first rotating shaft 13 is rotatably supported by the upper case 42 and the first housing part 411 by a pair of upper and lower bearings 15 and 16 (see FIG. 5). Although not shown, the third rotating shaft 31 (FIG. 1) is rotatably supported by the third housing portion 413 by a pair of left and right bearings. In addition, a pair of right and left drive shafts is connected to the rotating body 3 (differential mechanism) in the third housing portion 413 through a through hole 413 a penetrating the third housing portion 413 in the left-right direction. The drive shaft forms the third rotation shaft 31.

  FIG. 5 is a cross-sectional view showing a main part configuration of the vehicle drive device 100 in an assembled state, particularly a state in which the electric motor 1 and the rotating body 2 are housed in the case 4. As shown in FIG. 5, the first rotating shaft 13 is configured to be substantially cylindrical with the axis CL1 as a center. A substantially cylindrical shaft portion 11a centered on the axis CL1 is provided on the inner diameter portion of the rotor 11. The inner peripheral surface of the shaft portion 11a and the outer peripheral surface of the first rotating shaft 13 are connected via a spline, and the rotor 11 and the first rotating shaft 13 rotate integrally. A first gear 14 having a substantially cylindrical inner peripheral surface centered on the axis CL1 is disposed above the shaft portion 11a. The inner peripheral surface of the first gear 14 and the outer peripheral surface of the first rotating shaft 13 are spline-coupled, and the first gear 14 and the first rotating shaft 13 rotate integrally.

  A substantially circular bulging portion 414 protruding upward is provided at the bottom of the housing 41 (first housing portion 411), and a concave bearing support portion 415 centered on the axis CL1 is provided on the upper surface of the bulging portion 414. Provided. A lower end of the first rotating shaft 13 below the shaft 11 a is rotatably supported by a bearing support 415 of the housing 41 via a ball bearing 16. On the lower surface of the upper case 42, a substantially cylindrical bearing support portion 416 centering on the axis CL1 is provided. The upper end of the first rotating shaft 13 above the first gear 14 is rotatably supported by the bearing support 416 of the upper case 42 via the ball bearing 15.

  A stator 12 is arranged around the rotor 11 with a gap (air gap GP) having a predetermined length. The winding 122 is arranged on the stator core 121. The lower end of the winding 122 extends below the bottom surface of the rotor 11 and is located radially outside the bulging portion 414.

  The second rotation shaft 21 is formed in a substantially cylindrical shape around the axis CL2. A worm 23 is formed on the outer peripheral surface at the center in the vertical direction of the second rotating shaft 21. Above the worm 23, a second gear 22 having a substantially cylindrical inner peripheral surface centered on the axis CL2 is arranged. The inner peripheral surface of the second gear 22 and the outer peripheral surface of the second rotating shaft 21 are spline-coupled, and the second gear 22 and the second rotating shaft 21 rotate integrally. The teeth on the outer peripheral surface of the second gear 22 mesh with the teeth on the outer peripheral surface of the first gear 14, and torque is transmitted from the first gear 14 to the second gear 22.

  FIG. 6 is a perspective view of the lower case 43 (a view as viewed from obliquely above). As shown in FIG. 6, on the upper surface of the lower case 43, a substantially cylindrical bearing support portion 431 centering on the axis CL2 (FIG. 5) is provided. As shown in FIG. 5, the lower end of the second rotary shaft 21 below the worm 23 is rotatably supported by a bearing support 431 of the lower case 43 via a tapered roller bearing 25. That is, since the second rotary shaft 21 has a larger thrust load (axial load) than the first rotary shaft 13, the tapered roller bearing 25 suitable for supporting the thrust load is used as the bearing. A substantially cylindrical bearing support portion 431 protruding from the lower surface of the upper case 42 about the axis CL2. The upper end of the second rotating shaft 21 above the second gear 22 is rotatably supported by a bearing support 421 of the upper case 42 via a tapered roller bearing 24.

  FIG. 7 is a bottom view (view from below) of the housing 41. As shown in FIGS. 4, 5, and 7, a partition wall 417 protrudes upward from the bottom left end of the first housing part 411 adjacent to the opening 41b. At the bottom of the first housing part 411, a lubricating oil storage space (first storage space SP1) defined by the partition 417 is formed. As shown in FIG. 5, the height of the oil level OL1 of the lubricating oil stored in the first storage space SP1 is defined by the height of the partition wall 417. The upper end of the partition 417 is located above the lower end of the winding 122 and below the bottom of the rotor 11. Therefore, the lower end of the winding 122 is always immersed in the lubricating oil while preventing the lubricating oil from entering the air gap GP.

  Although not shown, a cutout or a through hole reaching the bearing support portion 415 is provided in the bulging portion 414 of the first housing portion 411. Thereby, the radial outside of the bulging portion 414 and the radial inside of the bearing support portion 415 communicate with each other, and the lubricating oil in the first storage space SP1 can be guided to the space below the first rotating shaft 13. Instead of providing notches or the like in the bulging portion 414, the height of the bulging portion 414 may be entirely lower than the height of the partition wall. As shown in FIG. 4, the first housing portion 411 is provided with a mounting portion 418 of the stator core 121 so as to sandwich the partition wall 417.

  The dotted line in FIG. 7 indicates the mounting position of the lower case 43. As shown in FIGS. 5 and 7, the lower case 43 is attached to the bottom surface of the housing 41 beyond the partition 417, and the bearing support portion 431 of the lower case 43 is located below the partition 417. As shown in FIGS. 5 and 6, on the upper surface of the lower case 43, a concave portion 432 is provided around the bearing support portion 431, and a lubricating oil storage space (a second storage space SP2) is formed inside the concave portion 432. You.

  As shown by the arrow A in FIG. 5, the lubricating oil in the first storage space SP1 is guided to the second storage space SP2 beyond the partition wall 417. Therefore, the oil level OL2 of the lubricating oil in the second storage space SP2 is lower than the oil level OL1 of the first storage space SP1. The bearing support portion 431 is provided with a through hole 431a, and the radial inside and the radial outside of the bearing support portion 431 communicate with each other through the through hole 431a. Thereby, the lubricating oil in the second storage space SP2 can be guided to the space below the second rotating shaft 21.

  As a characteristic configuration of this embodiment, spiral shafts 51 and 52 are press-fitted into the first cylindrical shaft 13 and the second cylindrical shaft 21, respectively. , 21 rotate together. FIG. 8 is a perspective view of the spiral shaft 52. As shown in FIGS. 5 and 8, the spiral shaft 52 extends vertically about the axis CL2, and has a cylindrical portion 521 having an open upper end surface 521a and a lower end surface 521b, and a lower end of the cylindrical portion 521. And a substantially ring-plate-shaped cover portion 522 centered on an axis CL2 extending radially outward. The length of the cylindrical portion 521 is substantially equal to the length of the second rotation shaft 21. The cylindrical portion 521 of the spiral shaft 52 is pressed into the inner peripheral surface of the second rotating shaft 21 from below the second rotating shaft 21.

  On the inner peripheral surface of the cylindrical portion 521, that is, on the peripheral surface of the hole portion 521c, a spiral projection 523 is formed from the lower end to the upper end of the cylindrical portion 521, and a spiral groove 524 is formed via the projection 523. It is formed. The direction of the spiral from the lower end to the upper end of the cylindrical portion 521 matches, for example, the rotation direction of the second rotary shaft 21 during normal traveling (during forward traveling). By providing the spiral groove 524 inside the spiral shaft 52 in this manner, the lubricating oil can be guided upward from the lower end surface 521b along the groove 524 by centrifugal force with the rotation of the spiral shaft 52. Lubricating oil can flow out from the end face 521a. That is, the lubricating oil in the spiral shaft 52 is pressed against the inner peripheral surface of the spiral shaft 52 by the centrifugal force due to the rotation of the spiral shaft 52, so that the lubricating oil can be raised along the groove 524.

  As shown in FIG. 5, the cover portion 522 is provided so as to cover the bottom surface of the tapered rollers 25 a of the tapered roller bearing 25. Thereby, it is possible to prevent the oil from being sucked through the tapered rollers 25a as shown by the arrow B (dotted line) in FIG. That is, since the tapered roller bearing 25 generates a speed difference in the circumferential rotation between the upper and lower portions of the tapered roller 25a, there is a possibility that the oil is sucked upward from below. However, in the present embodiment, since the cover portion 522 extends below the tapered rollers 25a to block the path where suction occurs, it is possible to prevent oil from being sucked through the tapered rollers 25a. Thereby, the flow of oil to the hole 521c can be promoted.

  Although illustration of a single unit is omitted, the spiral shaft 51 is configured similarly to the spiral shaft 52. That is, as shown in FIG. 5, the spiral shaft 51 has a cylindrical portion 511 having an open upper end surface 511a and a lower end surface 511b, and a spiral groove 514 formed on a peripheral surface of a hole 511c inside the cylindrical portion 511. Have. However, since the spiral shaft 51 does not need to cover the bottom surface of the ball bearing 16, the spiral shaft 51 is not provided with a cover. The spiral shaft 51 is pressed into the inner peripheral surface of the first rotating shaft 13 from above the first rotating shaft 13.

  As shown in FIG. 5, an oil passage LN1 for guiding the lubricating oil in the second storage space SP2 to the hydraulic pump is formed inside the partition 417. FIG. 9 is a sectional view of a single unit of the housing 41 showing a configuration of the oil passage LN1 (partially hatched), and FIG. 10 is a main part of the vehicle drive device 100 showing a configuration of an end of the oil passage LN1. 10 is a cross-sectional view (a cross-sectional view along line XX of FIG. 9).

  As shown in FIGS. 9 and 10, the partition 417 is provided with a protrusion 451 whose bottom protrudes below the oil level OL2, and the protrusion 451 has a larger diameter than other parts. A substantially cylindrical opening 452 is provided on the lower end surface of the protruding portion 451 upward. Above the opening 452, an oil hole 453 having a substantially circular cross section extending linearly in a substantially horizontal direction above the oil level OL2 and extending from the side wall of the first housing portion 411 to the opening 452 is formed. Is done.

  As shown in FIG. 9, the first housing portion 411 further extends linearly in a substantially horizontal direction through the inside of a seat surface 411 a for mounting the hydraulic pump 46, and has a substantially cross-sectional shape reaching the oil hole 453. A circular oil hole 454 is formed. Further, an oil hole 455 having a substantially circular cross section is formed in the first housing portion 411 and extends linearly in a substantially horizontal direction from the seat surface 411 a to the oil hole 454. The ends of the oil holes 453 and 454 are closed by closing members 453a and 454a such as bolts, respectively. Thus, an oil passage LN1 extending from the opening 452 to the hydraulic pump 46 is formed by the oil holes 453 to 455.

  As shown in FIGS. 7 and 10, the filter unit 60 is inserted and attached to the opening 452 from below. As shown in FIG. 7, the filter unit 60 is provided substantially at the center of the vehicle drive device 100 in the front-rear and left-right directions. Therefore, even when the oil level OL2 is inclined due to turning or acceleration / deceleration of the vehicle, a sufficient amount of lubricating oil is always present below the filter unit 60.

  FIG. 11 is a perspective view of the filter unit 60. As shown in FIGS. 10 and 11, the filter unit 60 has a substantially ring-shaped base plate 61, a filter portion 62 protruding upward from the inner side surface of the base plate 61, and being fixed to a lower end surface of the base plate 61 and protruding downward. And a cap portion 63. The filter part 62 is formed, for example, in a net shape so as to filter the lubricating oil.

  The filter unit 60 is mounted on the bottom surface of the protrusion 451 of the partition wall 417 by the snap ring 64. The cap portion 63 has a substantially cylindrical shape with a closed bottom surface, and a circular suction port 63a is opened through the cylindrical surface. The lubricating oil in the second storage space SP2 is sucked into the hydraulic pump 46 via the suction port 63a, the filter 62, and the oil passage LN1. As shown in FIG. 9, the oil discharged from the hydraulic pump 46 passes through an oil passage LN2 formed from the seat surface 411a, that is, an oil passage LN2 formed upward along the side wall of the first housing portion 411. It is guided to the upper case 42. Then, as shown in FIG. 5, it is guided to an outflow portion 42 b formed in the lower surface of the upper case 42 in the circumferential direction around the axis CL <b> 1 facing the upper end of the winding 122.

  FIG. 12 is a diagram illustrating an example of the flow of the lubricating oil by the lubricating oil supply device according to the present embodiment. When the rotor 11 rotates, the second rotating shaft 21 rotates via the first rotating shaft 13, the first gear 14, and the second gear 22, and the spiral shaft 52 pressed into the second rotating shaft 21 accordingly. Rotate. At this time, the lubricating oil stored in the second storage space SP2 flows into the hole 521c in the spiral shaft 52 via the lower end surface 521b of the spiral shaft 52 as indicated by an arrow A1 in FIG. This lubricating oil rises along the spiral groove 524 as shown by the arrow A2 while being pressed against the peripheral surface of the hole 521c by the centrifugal force, and as shown by the arrow A3, the upper end surface 521a of the spiral shaft 52. Spill out of.

  Thereby, lubricating oil can be easily supplied to the tapered roller bearing 24 at the upper end of the second rotating shaft 21. The lubricating oil that has passed through the tapered roller bearings 24 flows radially outward on the upper surface of the hub portion of the second gear 22 as shown by the arrow A4, and is supplied to the teeth of the second gear 22 and the like. At this time, the bottom surface of the tapered roller bearing 25 at the lower end of the second rotary shaft 21 is covered by the cover 522 at the lower end of the spiral shaft 52. Therefore, it is possible to prevent the oil from being sucked through the tapered roller bearing 25, and to promote the flow of the oil to the hole 521c.

  When the rotor 11 rotates, the spiral shaft 51 pressed into the first rotating shaft 13 also rotates. At this time, as shown by the arrow B1, the lubricating oil stored in the first storage space SP1 flows into the hole 511c in the spiral shaft 51 via the lower end surface of the spiral shaft 51. The lubricating oil rises along the spiral groove 514 on the peripheral surface of the hole 511c as shown by the arrow B2 while being pressed against the inner peripheral surface of the spiral shaft 51 by the centrifugal force, as shown by the arrow B3. At the upper end surface 511a of the spiral shaft 51. Thereby, lubricating oil can be easily supplied to the ball bearing 15 at the upper end of the first rotating shaft 13. The lubricating oil that has passed through the ball bearings 15 flows radially outward on the upper surface of the hub portion of the first gear 14 as shown by the arrow B4, and is supplied to the teeth of the first gear 14 and the like.

  When the hydraulic pump 46 (FIG. 9) is driven, the lubricating oil in the second storage space SP2 is sucked into the hydraulic pump 46 via the filter unit 60 and the oil passage LN1 inside the partition 417. As shown in FIG. 10, the filter unit 60 is mounted on a protrusion 451 protruding downward from the partition 417, and the suction port 63 a of the filter unit 60 is provided further below the protrusion 451. Therefore, in FIG. 12, even when the oil level OL2 of the lubricating oil in the second storage space SP2 is inclined, the suction port 63a is always filled with the lubricating oil, and aeration can be prevented. The lubricating oil discharged from the hydraulic pump 46 is guided to the upper case 42 via the oil passage LN2, and flows out of the outflow portion 42b as indicated by an arrow C1 in FIG. Thereby, lubricating oil is supplied to the winding 122, and the winding 122 can be cooled effectively.

  The height of the oil level OL1 of the first storage space SP1 is defined by the partition 417, and the oil level OL1 is located below the bottom surface of the rotor 11 and above the lower end of the winding 122. Thereby, the winding 122 is always immersed in the lubricating oil without filling the air gap GP with oil, and the winding 122 can be efficiently cooled. The lubricating oil flowing out of the outflow portion 42b is stored in the first storage space SP1, and the lubricating oil that has passed through the partition 417 flows from the first storage space SP1 to the second storage space. Thereby, the lubricating oil circulates through the case 4.

According to the present embodiment, the following effects can be obtained.
(1) The lubricating oil supply device according to the present embodiment is mounted on a vehicle and has a case 4 in which lubricating oil is stored, and is disposed inside the case 4 so as to be rotatable around vertical axes CL1 and CL2. And a first rotating shaft 13 and a second rotating shaft 21 (FIG. 5). Spiral shafts 51 and 52 are press-fitted into the first rotating shaft 13 and the second rotating shaft 21, respectively. The spiral shaft extends along lower surfaces 511b and 521b, which are open end surfaces located below the oil surfaces OL1 and OL2 of the lubricating oil, and axial grooves CL1 and CL2, and has a spiral groove 514 on the inner peripheral surface. The lubricating oil that has risen along the grooves 514 and 524 with the rotation of the first rotating shaft 13 and the second rotating shaft 21 and the holes 511c and 521c in which the 524 is formed is discharged to the outside of the holes 511c and 521c. And upper end surfaces 511a and 521a that are open end surfaces (FIG. 5).

  With this configuration, the lubricating oil stored at the bottom of the case 4 can be guided upward through the inside of the spiral shafts 51 and 52. For this reason, lubricating oil can be easily supplied to components (bearings 15, 24, etc.) arranged at the upper end of the first rotating shaft 13 and the second rotating shaft 21 arranged in the vertical direction.

(2) The holes 511c and 521c of the spiral shafts 51 and 52 penetrate vertically along the axes CL1 and CL2 (FIG. 5). The lubricating oil supply device further includes bearings 15 and 24 that rotatably support the upper ends of the first rotating shaft 13 and the second rotating shaft 21 (FIG. 5). As a result, the lubricating oil that has passed through the inside of the spiral shafts 51, 52 flows out from the upper end surfaces 511a, 521a of the spiral shafts 51, 52, and the length of the rotating shafts 13, 21 (the distance from the oil surfaces OL1, OL2). Regardless, lubricating oil can be easily supplied to the bearings 15 and 24 located at the uppermost part in the case 4.

(3) The lubricating oil supply device further includes a tapered roller bearing 25 that rotatably supports the lower end of the second rotating shaft 21 (FIG. 5). The spiral shaft 52 has a cover 522 so as to cover the lower part of the tapered roller bearing 25 (FIG. 5). Accordingly, the flow of oil from below through the tapered roller bearing 25 can be suppressed, and the flow of lubricating oil to the hole 521c in the spiral shaft 52 can be promoted.

(4) The first rotating shaft 13 and the second rotating shaft 21 have, on their outer peripheral surfaces, a first gear 14 and a second gear 22 located below the upper end surfaces 511a, 521a of the spiral shafts 51, 52 ( (Fig. 5). This makes it possible to easily supply the lubricating oil to the gears 14 and 22 located at the upper part in the case 4.

(5) The case 4 has a partition 417 that divides the lubricating oil storage space at the bottom into a first storage space SP1 on the first rotating shaft 13 side and a second storage space SP2 on the second rotating shaft 21 side. . Thereby, the oil level OL1 of the lubricating oil stored in the first storage space SP1 and the oil level OL2 of the lubricating oil stored in the second storage space SP2 can be set to different heights.

(6) The lubricating oil supply device further includes a hydraulic pump 46 (FIG. 9). The first rotating shaft 13 is provided integrally with the rotor 11 of the electric motor 1 (FIG. 5). The case 4 has an outflow portion 42b for discharging the oil sucked by the hydraulic pump 46 from above the first storage space SP1, and a lower case 43 is attached below the housing 41, and a bottom surface of the first storage space SP1. Is located above the bottom surface of the second storage space SP2. Thereby, the oil level OL1 of the lubricating oil stored in the first storage space SP1 can be set at a higher position than the oil level OL2 of the lubricating oil stored in the second storage space SP2, and the height of the oil level OL1 can be increased. Can be kept constant. As a result, by arranging the bottom surface of the rotor 11 at a position higher than the oil surface OL1 and arranging the lower end of the winding 122 of the electric motor 1 at a position lower than the oil surface OL1, lubrication to the air gap GP is achieved. The winding 122 can be cooled with the lubricating oil while preventing oil from entering.

(7) The lubricating oil supply device communicates with the oil passage LN1 formed inside the partition 417 and the hydraulic pump 46 via the oil passage LN1, and sucks the lubricating oil stored in the second storage space SP2. It further has 60 suction ports 63a (FIGS. 9 and 10). Thereby, the lubricating oil stored in the second storage space SP2 can be easily guided to the hydraulic pump 46. Since the filter 60 is provided on the protruding portion 451 protruding below the partition 417, the suction port 63a can be arranged at a low position, and aeration can be prevented.

  The above embodiment can be modified into various forms. Hereinafter, modified examples will be described. In the above embodiment, the lubricating oil flowing into the holes 511c, 521c from the lower end surfaces 511b, 512b of the spiral shafts 51, 52 is discharged from the upper end surfaces 511a, 512a. That is, although the lower end surfaces 511b and 512b are configured as opening surfaces and the upper end surfaces 511a and 512a are configured as oil outlet portions, the configurations of the opening surface and the oil discharge portion are not limited thereto. For example, a through hole may be provided below the upper end of the rotating shaft so as to penetrate the rotating shaft in the radial direction, and this may be used as an oil discharge unit. Therefore, the hole may be a low hole having a predetermined depth instead of a through hole.

  In the above embodiment, the first rotating shaft 13 and the second rotating shaft 21 and the spiral shafts 51 and 52 are separately provided to constitute a rotating body. That is, the spiral shafts 51 and 52 as the internal rotation shafts are fitted (press-fitted) inside the rotation shafts 13 and 21 as the external rotation shafts. For example, a spiral groove is formed on the inner peripheral surface of the rotation shafts 13 and 21. The spiral shaft may be provided. In the above embodiment, the upper ends of the first rotating shaft 13 and the second rotating shaft 21 are rotatably supported by the ball bearings 15 and the tapered roller bearings 24, respectively. Although the second gear 22 is arranged, the configurations of the bearing and the gear portion are not limited to those described above.

  In the above embodiment, the first rotating shaft 13 and the spiral shaft 51 are provided as the first rotating body so as to be rotatable around the vertical axis CL1 (first axis), and the second rotating shaft 21 is provided as the second rotating body. And the spiral shaft 52 are provided so as to be rotatable about a vertical axis CL2 (second axis), but the configuration of the first rotating body and the second rotating body is not limited to this. In the above-described embodiment, the oil is caused to flow out from the outflow portion 42b of the upper case 42. However, if the oil sucked by the hydraulic pump flows out from above the first storage space, any configuration of the oil outflow portion can be used. It may be something. In the above embodiment, the lubricating oil is sucked from the suction port 63a of the filter unit 60, but the configuration of the oil suction section is not limited to this. In the above embodiment, the oil passage is formed in the partition wall 417 of the housing 41. However, the oil passage may be formed in the lower case 43 or the like, and the configuration of the case is not limited to the above.

  In the above-described embodiment, an example in which the lubricating oil supply device is applied to the rotating shafts 13 and 21 of the vehicle driving device 100 has been described. The present invention can be similarly applied to various types of rotating bodies arranged so as to be rotatable about a vertical axis.

  The above description is merely an example, and the present invention is not limited by the above-described embodiments and modifications as long as the features of the present invention are not impaired. It is also possible to arbitrarily combine one or more of the above-described embodiment and the modifications, and it is also possible to combine the modifications.

DESCRIPTION OF REFERENCE NUMERALS 1 motor, 4 cases, 11 rotor, 13 first rotating shaft, 14 first gear, 15 ball bearing, 21 second rotating shaft, 22 second gear, 24, 25 tapered roller bearing, 46 hydraulic pump, 51, 52 spiral Shaft, 63a suction port, 417 partition, 511a, 521a upper end surface, 511b, 521b lower end surface, 511c, 521c hole, 514, 524 groove, 522 cover, LN1 oil passage, OL1, OL2 oil surface, SP1 first storage Space, SP2 Second storage space

Claims (8)

A case in which lubricating oil is stored inside the vehicle,
A rotating body disposed rotatably around a vertical axis in the case,
The rotating body is
An opening surface located below the oil level of the lubricating oil,
A hole formed along the axis from the opening surface and having a spiral groove formed on an inner peripheral surface thereof;
A lubricating oil supply device comprising: an oil outlet for discharging the lubricating oil that has risen along the groove along with the rotation of the rotating body to the outside of the hole. The lubricating oil supply device according to claim 1,
The hole is a through hole that penetrates the rotating body along the axis,
The lubricating oil supply device further comprises a bearing that rotatably supports an upper end portion of the rotating body. The lubricating oil supply device according to claim 1 or 2,
The rotating body is
A substantially cylindrical external rotation axis centered on the axis,
A substantially cylindrical internal rotating shaft centered on the axis, which is integrally fitted to the external rotating shaft inside the external rotating shaft,
The lubricating oil supply device, wherein the groove is formed on an inner peripheral surface of the internal rotation shaft. The lubricating oil supply device according to claim 3,
Further comprising a tapered roller bearing rotatably supporting the lower end of the rotating body,
The lubricating oil supply device, wherein the internal rotation shaft has a cover so as to cover below the tapered roller bearing. The lubricating oil supply device according to any one of claims 1 to 4,
The lubricating oil supply device, wherein the rotating body has a gear portion on an outer peripheral surface thereof below the oil outlet portion. The lubricating oil supply device according to any one of claims 1 to 5,
The rotator is disposed in the case so as to be rotatable about a first axis, and is disposed in the case so as to be rotatable about a second axis parallel to the first axis. And a second rotating body,
The lubricating oil supply device, wherein the case has a partition for dividing a lubricating oil storage space at a bottom thereof into a first storage space on a first rotating body side and a second storage space on a second rotating body side. The lubricating oil supply device according to claim 6,
Further equipped with a hydraulic pump,
The first rotating body is provided so as to be rotatable integrally with a rotor of the electric motor,
The case has an oil outflow portion through which the lubricating oil sucked by the hydraulic pump flows out from above the first storage space, and a bottom surface of the first storage space is higher than a bottom surface of the second storage space. A lubricating oil supply device configured to be located. The lubricating oil supply device according to claim 7,
An oil passage formed inside the partition,
A lubricating oil supply device, further comprising: an oil suction unit that communicates with the hydraulic pump via the oil passage and sucks lubricating oil stored in the second storage space.

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