JP2013224720A - Lubrication structure of power transmission device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve good lubrication even when a gear that scrapes up lubricating oil rotates at a low speed, while reducing a reserved amount of the lubricating oil in a casing of a power transmission device.SOLUTION: A lubrication structure of a power transmission device is configured to include a first shaft 54, 56 provided with a first gear 44, and a second shaft 16, which is arranged parallel to the first shaft and at a position higher than the first shaft and is provided with a parking gear 22 and a second gear 20 meshing with the first gear; and to supply lubricating oil scraped up from an oil reserving part 60 by the rotation of the first gear 44 to a lubrication required part in a casing 2. The parking gear 22 is disposed adjoining to the second gear to allow the lubricating oil scraped up by the rotation of the first gear to adhere to the parking gear; and an oil supply path 80 for guiding the lubricating oil scattered from the parking gear by the rotation of the parking gear to a lubrication required part on the second shaft 16 is arranged to pass through a space at the front along the moving direction of an upper part of the parking gear during rotation and above the axis of the second shaft.

Description

  The present invention relates to a lubrication structure for a power transmission device that uses the lifting of lubricating oil by rotation of a gear, and belongs to the field of vehicle power transmission technology.

  A vehicle is equipped with a power transmission device that transmits power output from a drive source such as an electric motor or an engine to an axle. Further, the vehicle has various lubrication structures for supplying lubricating oil to the lubrication required parts such as gears and bearings constituting the power transmission device.

  For example, Patent Document 1 discloses an annular projecting portion in which lubricating oil transmitted so as to spread one surface of the parking gear radially outward due to centrifugal force accompanying rotation of the parking gear protrudes axially from this surface. Furthermore, a technique is disclosed in which the guide is guided to a bearing adjacent in the axial direction of the parking gear.

  By the way, in a power transmission device having a differential device, lubricating oil stored in an oil tank (hereinafter also referred to as “diff oil tank”) of the differential device is used as a ring gear (hereinafter also referred to as “diff ring gear”) of the differential device. There is known a lubrication structure that is scraped up by rotation and supplied to a lubrication required portion. This type of lubrication structure is used particularly effectively in a vehicle that is not equipped with an oil pump for feeding lubricating oil to a lubrication required portion.

JP 2011-174582 A

  In the case of supplying the lubricating oil by using the scraping by the rotation of a gear such as a differential ring gear, the amount of the scraping of the lubricating oil depends on the rotational speed of the gear and the liquid level of the oil reservoir.

  For this reason, when the vehicle travels at a low speed, the number of rotations of the gear decreases and the amount of lubricating oil scraped decreases. In this state, in order to prevent insufficient lubrication, the oil storage It is necessary to raise the liquid level of the part to some extent.

  On the other hand, from the viewpoint of reducing agitation resistance and weight, it is required to reduce the amount of lubricating oil stored in the case of the power transmission device. It becomes easy to become insufficient lubrication. In particular, inadequate lubrication tends to occur at the lubrication required part far from the gear for scooping up the lubricating oil.

  Accordingly, the present invention provides a lubricating structure for a power transmission device that scrapes up the lubricating oil by rotation of a gear and supplies the lubricating oil to a required lubrication portion while reducing the amount of lubricating oil stored in the case of the power transmission device. It is an object of the present invention to achieve good lubrication even when the rotation of the gear that lifts up the gears is low.

  In order to solve the above-described problems, the lubricating structure for a power transmission device according to the present invention is configured as follows.

First, the invention according to claim 1 of the present application is
A first shaft provided with a first gear;
A second shaft provided in parallel with the first shaft and at a higher position than the first shaft, and provided with a second gear meshing with the first gear;
A parking gear provided on the second shaft and having a plurality of recesses that engage with the pawls of the parking pole on the outer peripheral surface;
A case for accommodating the first gear, the second gear, and the parking gear;
An oil reservoir is provided at the bottom of the case so that the lower portion of the first gear is immersed, and the lubricant that has been scraped up from the oil reservoir by the rotation of the first gear is contained in the case. A lubrication structure of a power transmission device configured to be supplied to a lubrication required part of
The parking gear is provided adjacent to the second gear so that the lubricating oil scraped up by the rotation of the first gear can be adhered thereto,
An oil supply path that guides the lubricating oil scattered from the parking gear by rotation of the parking gear to a lubrication required portion on the second shaft is forward in the moving direction when the parking gear is rotated and the axis of the second shaft It is provided so that it may pass through the space above.

The invention according to claim 2 is the invention according to claim 1,
A parking gear oil receiving portion that receives lubricating oil scattered from the parking gear in the oil supply path is disposed so as to overlap the parking gear in the axial direction.

Furthermore, the invention according to claim 3 is the invention according to claim 2,
The oil supply path is provided with an oil reservoir portion recessed downward in a position where the parking gear oil receiving portion and the parking gear overlap in the axial direction.

Furthermore, the invention according to claim 4 is the invention according to any one of claims 1 to 3,
In the axial direction, the second gear is disposed on one end side with respect to the central portion of the second shaft, and the parking gear is disposed on the other end side of the second shaft with respect to the second gear,
The oil supply path is arranged to guide the lubricating oil scattered from the parking gear to the lubrication required portion on the other end side of the second shaft.

The invention according to claim 5 is the invention according to claim 4,
The oil supply path is a first supply path that guides the lubricating oil scattered from the first gear to the lubrication required part on the other end side of the second shaft,
As an oil supply path different from the first supply path, there is provided a second supply path that guides the lubricating oil scattered from the first gear to the lubrication required portion on the one end side of the second shaft,
An oil receiving portion for a first gear that receives lubricating oil scattered from the first gear is provided at each upstream end of the first supply passage and the second supply passage,
The oil receiving portions for the first gears of the first supply path and the second supply path are arranged in the axial direction so as to overlap with the first gear in the axial direction,
The oil receiving portion for the first gear of the first supply path is provided with a partition wall that guides the lubricating oil supplied from the first gear to the downstream side of the first supply path,
The oil receiving portion for the first gear of the second supply path is provided with a partition wall that guides the lubricating oil supplied from the first gear to the downstream side of the second supply path.

Furthermore, the invention according to claim 6 is the invention according to any one of claims 1 to 5,
An oil supply port for supplying oil into the case is provided in a portion of the case located above the upstream end of the oil supply path.

Furthermore, the invention according to claim 7 is the invention according to any one of claims 1 to 6,
A third gear is provided on the third shaft connected to the drive source;
A fourth gear meshing with the third gear is provided on the second shaft;
In the second shaft, the parking gear is disposed between the second gear and the fourth gear.

The invention according to claim 8 is the invention according to any one of claims 1 to 7,
An oil pan that receives lubricating oil provided for lubrication in the case is inclined downward toward the rear of the vehicle in a vehicle-mounted state and provided on the front side of the vehicle compared to the oil reservoir,
In the case, an oil recovery part that receives and recovers lubricating oil used for lubrication by the oil pan and a partition part that separates the oil storage part are provided,
A communication port that communicates the oil recovery part and the oil storage part is provided at a rear part of the partition part in a vehicle-mounted state.

  First, according to the first aspect of the present invention, the second gear that meshes with the first gear the lubricating oil scraped up from the oil reservoir by the rotation of the first gear on the first shaft on the second shaft. In addition, the lubricating oil scattered from the parking gear can pass through the space in front of the parking gear upper portion and in the moving direction and above the axis of the second shaft. It can supply to the lubrication required part on a 2nd axis | shaft via the provided oil supply path.

  For this reason, even when the rotational speed of the first gear is low, such as when traveling at a low speed, even if the amount of lubricant sprayed from the first gear decreases, the lubricating oil is supplied to the oil supply path using the parking gear as described above. By supplying, good lubrication in the second shaft can be realized.

  Further, even if the liquid level of the oil reservoir is not set high, the parking gear is used for lubricating the second shaft as described above, so that the second when the rotation speed of the first gear is low is used. Since insufficient lubrication of the shaft can be compensated, the amount of oil stored can be reduced.

  Furthermore, according to the second aspect of the present invention, since the parking gear oil receiving portion of the oil supply path is disposed so as to overlap the parking gear in the axial direction, it is scattered from the parking gear. Lubricating oil can be efficiently supplied to the oil supply path.

  Further, when the invention according to claim 3 is applied to the invention according to claim 2, the oil reservoir is provided in the oil supply passage at a position where the oil receiving portion for parking gear and the parking gear overlap in the axial direction. Therefore, the lubricating oil supplied from the parking gear to the parking gear oil receiving portion can be prevented from overflowing from the oil supply path.

  Furthermore, according to the fourth aspect of the present invention, when the second gear meshing with the first gear is disposed on one end side with respect to the central portion of the second shaft, the first gear is scraped by rotation. The raised lubricating oil is disposed adjacent to the other end side of the second shaft with respect to the second gear, even if it does not reach the required lubrication portion on the other end side of the second shaft far from the first gear. After adhering to the parking gear, it is guided to the lubrication required portion on the other end side of the second shaft via the parking gear and the oil supply path. Therefore, insufficient lubrication can be suppressed also on the other end side of the second shaft far from the first gear.

  Further, when the invention according to claim 5 is applied to the invention according to claim 4, the first supply path that guides the lubricating oil scattered from the first gear to the lubrication portion on the other end side of the second shaft. And a second supply path for guiding the lubricating oil scattered from the first gear to the lubrication required part on the one end side of the second shaft, and a first supply path upstream end and a second supply path upstream end, Are each provided with a first gear oil receiving portion. Since these first gear oil receiving portions are arranged side by side in the axial direction so as to overlap with the first gear in the axial direction, it is possible to reliably receive the lubricating oil scattered from the first gear. it can. Then, the lubricating oil scattered from the first gear and received by the first gear oil receiving portion of the first supply passage is separated by the partition wall provided in the first gear oil receiving portion of the first supply passage. Lubricating oil that can be reliably guided to the downstream side and is scattered from the first gear and received by the first gear oil receiving portion of the second supply path is provided in the first gear oil receiving portion. The wall can reliably lead to the downstream side of the second supply path. Therefore, the lubricating oil supplied from the first gear to the first gear oil receiving portions of the first supply path and the second supply path is divided into a lubrication required portion on one end side and a lubrication required portion on the other end side of the second shaft. Can be supplied stably.

  Furthermore, according to the sixth aspect of the present invention, the lubricating oil injected into the case from the oil supply port first falls to the upstream end of the oil supply path, and passes through the oil supply path to the main shaft. Since it is supplied to the lubrication part, the initial lack of lubrication of the power transmission device can be suppressed.

  Furthermore, according to the seventh aspect of the present invention, the lubricating oil scraped up by the rotation of the first gear and scattered between the second gear and the fourth gear of the second shaft is supplied to the second gear. It can be efficiently attached to the parking gear disposed between the fourth gear and the amount of lubricating oil supplied from the parking gear to the oil supply path can be effectively ensured.

  According to the eighth aspect of the present invention, the lubricating oil in the oil recovery portion received and recovered by the oil pan is guided to the rear portion of the oil recovery portion using the downward inclination of the oil pan. Thus, it is possible to smoothly return to the oil storage part from the communication port provided at the rear part of the partition wall part separating the oil recovery part and the oil storage part, thereby effectively maintaining the liquid level of the oil storage part can do. In addition, since the lubricating oil that has become hot due to lubrication is cooled in the oil recovery unit by running wind or the like and then returned to the oil storage unit, the temperature rise of the lubricating oil in the oil storage unit is suppressed. Can do. Therefore, the lubricating action of the lubricating oil can be exhibited well and the deterioration of the lubricating oil can be suppressed.

It is sectional drawing which looked at the power transmission device provided with the lubricating structure which concerns on one Embodiment of this invention from the vehicle side side. It is the sectional view on the AA line of FIG. It is a perspective view which shows the principal part of the power transmission device shown in FIG. It is a perspective view which shows the rear side oil path used for lubrication of the power transmission device shown in FIG. It is a perspective view which shows the front side oil path used for lubrication of the power transmission device shown in FIG. It is the BB sectional view taken on the line of FIG. 1 which shows the motion of the lubricating oil at the time of normal driving | running | working. It is a figure for demonstrating in detail the movement of the lubricating oil at the time of normal driving | running | working. FIG. 3 is a cross-sectional view taken along the line BB in FIG. 1 illustrating the movement of the lubricating oil during traveling at an extremely low vehicle speed. It is a figure for demonstrating in detail the motion of the lubricating oil at the time of a very low vehicle speed driving | running | working.

  Hereinafter, embodiments of the present invention will be described.

  1 and 2 show a power transmission device 1 having a lubrication structure according to the present embodiment, and FIG. 3 shows a main part of the power transmission device 1.

  The power transmission device 1 is mounted on an electric vehicle. As shown in FIGS. 1 and 2, a speed reducer 5 that decelerates and outputs power input from a motor (not shown) as a drive source. And a differential device 40 that further decelerates the power input from the speed reducer 5 and transmits the power to the axles 54 and 56, and a case 2 that houses the components of the speed reducer 5 and the differential device 40.

  In the cross-sectional view of FIG. 2, the output shaft of the motor and the coupling for coupling the motor and the speed reducer 5 are not shown.

  Further, the output shaft of the motor is assumed to extend in the vehicle width direction, and in the following description, the side approaching the motor in the vehicle width direction is the “front side” and the side away from the motor is the “rear side”. That's it.

  As shown in FIG. 2, the case 2 of the power transmission device 1 includes a front side case 4 that accommodates the coupling, and a rear side case 3 that is disposed on the rear side of the front side case 4. The front side case 4 and the rear side case 3 are coupled by a plurality of bolts.

  The speed reducer 5 of the power transmission device 1 includes an input shaft 6 that extends in the vehicle width direction and is connected in series to the output shaft of the motor, and an output shaft 16 that is arranged in parallel to the input shaft 6. Have. The output shaft 16 is disposed on the vehicle rear side and at a higher position than the input shaft 6.

  The front end of the input shaft 6 is rotatably supported by the front case 4 via the front bearing 10, and the rear end of the input shaft 6 is rotatably supported by the rear case 3 via the rear bearing 12. Has been. Similarly, the front side end portion of the output shaft 16 is rotatably supported by the front side case 4 via the front bearing 24, and the rear side end portion of the output shaft 16 rotates to the rear side case 3 via the rear bearing 26. Supported as possible.

  The front bearings 10 and 24 that support the input shaft 6 and the output shaft 16 are supplied with lubricating oil from a front side wall oil passage 70 formed in the wall of the front side case 4. The lubricating oil supplied from the front side wall oil passage 70 to the front bearing 10 of the input shaft 6 is received by an oil catch tray 68 (see FIGS. 1 and 6) disposed below the input shaft 6. Lubricating oil overflowing from the oil catch tray 68 is received by the oil pan 61 (see FIG. 1). On the other hand, the rear bearings 12 and 26 that support the input shaft 6 and the output shaft 16 are supplied with lubricating oil from a rear side wall oil passage 72 formed in the wall of the rear case 3. .

  A transfer gear 8 is provided on the input shaft 6, and a transfer gear 18 that meshes with the transfer gear 8 and has a larger diameter than the transfer gear 8 is provided on the output shaft 16. As a result, the power input from the motor to the input shaft 6 is transmitted to the output shaft 16 while being decelerated via the transfer gears 8 and 18.

  The transfer gear 18 is provided at a substantially central portion in the axial direction of the output shaft 16, and the output gear 20 is provided on the front side of the central portion in the axial direction of the output shaft 16.

  Further, a parking gear 22 is provided on the rear side of the output gear 20 of the output shaft 16. That is, the parking gear 22 is provided between the transfer gear 18 and the output gear 20 on the output shaft 16 and adjacent to both the gears 18 and 20. On the outer peripheral surface of the parking gear 22, a plurality of recesses 28 with which the pawl portions 32 of the parking pole 30 are engaged are provided. A base end portion of the parking pole 30 is rotatably supported by a bracket 34 fixed to the case 2 via a support shaft 36 extending in the vehicle width direction. When the driver operates the vehicle traveling range to be the P range, the parking pole 30 rotates about the support shaft 36, and the pawl portion 32 of the parking pole 30 moves to any one of the parking gears 22. By engaging with the recess 28, the power transmission system is mechanically locked, and the P range is realized.

  The differential device 40 of the power transmission device 1 includes a differential case 42 and a differential ring gear 44 fixed to the outer peripheral surface of the differential case 42.

  The diff ring gear 44 meshes with the output gear 20 of the speed reducer 5 and has a larger diameter than the output gear 20. Thereby, power is transmitted from the reduction gear 5 to the differential device 20 while being decelerated.

  The differential case 42 accommodates a pair of pinion gears 46, 48 facing each other and a pair of side gears 50, 52 meshing with the pinion gears 46, 48. The axles 54, 56 are splined to the side gears 50, 52, respectively. It is mated. The axles 54 and 56 are disposed at a lower position on the vehicle rear side than the input shaft 6 and the output shaft 16 of the speed reducer 5 so as to coincide with the center of the differential ring gear 44.

  The power transmitted from the speed reducer 5 to the differential device 40 is transmitted to the left and right axles 54 and 56 so as to have a rotational difference corresponding to the traveling state, and thereby, the drive wheels connected to the axles 54 and 56 ( (Not shown) is driven.

  As shown in FIG. 1, a differential oil tank 60 for storing lubricating oil is provided at the bottom of the case 2 so that the lower part of the differential ring gear 44 is immersed, and the differential oil tank is rotated by the rotation of the differential ring gear 44 while the vehicle is running. Lubricating oil scooped up from 60 is supplied to the lubrication required portion in the case 2.

  Further, in the output shaft 16 of the speed reducer 5, the parking gear 22 is provided adjacent to the output gear 20 so that the lubricating oil scraped up by the rotation of the diff ring gear 44 can adhere to the output gear 16. 20 and the transfer gear 18. Therefore, the lubricating oil scraped up by the rotation of the diff ring gear 44 and scattered between the output gear 20 and the transfer gear 18 efficiently adheres to the parking gear 22 and scatters from the parking gear 22 as will be described later. Lubricating oil can also be used for lubrication in the case 2.

  Further, the lubricating oil in the oil catch tray 68 is also supplied to the transfer gear 18 of the output shaft 16 via the transfer gear 8 of the input shaft 6, and the lubricating oil scattered from the diffring gear 44 and the parking gear 22 is also present. Since it can adhere, the lubricating oil scattered from the transfer gear 18 can also be used for lubrication in the case 2 as will be described later.

  The oil pan 61 that receives the lubricating oil used for lubrication in the case 2 is inclined downward toward the rear of the vehicle in a vehicle-mounted state and is provided on the front side of the vehicle compared to the differential oil tank 60. Further, in the case 2, there are provided an oil recovery part 62 that receives and recovers lubricating oil used for lubrication by an oil pan 61, and a partition wall part 64 that separates the oil recovery part 62 and the differential oil tank 60. Yes. The oil catch tray 68 is fixed to the partition wall 64.

  A communication port 66 for communicating the differential oil tank 60 and the oil recovery part 62 is provided at the rear part of the partition wall part 64 in the vehicle mounted state. As a result, the lubricating oil in the oil recovery part 62 received and recovered by the oil pan 61 is guided to the rear part of the oil recovery part 62 by using the rear downward inclination of the oil pan 61, and the partition wall part 64. It is possible to smoothly return to the differential oil tank 60 from the communication port 66 provided in the rear part. Therefore, the liquid level of the differential oil tank 60 can be effectively maintained. In addition, since the lubricating oil that has become hot due to lubrication is cooled by the oil recovery unit 62 by running wind or the like and then returned to the differential oil tank 60, the temperature rise of the lubricating oil in the differential oil tank 60 is suppressed. can do. Therefore, the lubricating action of the lubricating oil can be exhibited well and the deterioration of the lubricating oil can be suppressed.

  As shown in FIG. 3, above the diff ring gear 44, there are a rear side oil path 80 for guiding the lubricant scattered from the diff ring gear 44 to the rear bearings 12 and 26, and the lubricant scattered from the diff ring gear 44. Is provided as an oil supply path with a front-side oil path 100 for guiding the oil to the front bearings 10 and 24.

  As shown in FIG. 4, the rear-side oil path 80 includes a bottom portion 81 disposed so as to gradually become lower from the upstream end toward the downstream end, and a pair of side wall portions rising from both widthwise end portions of the bottom portion 81. 82 and 83.

  The rear oil path 80 includes an upstream portion 84 extending from the upstream end to the vehicle width direction rear side, and an intermediate portion extending from the downstream end of the upstream portion 84 toward the vehicle width direction rear side in a direction inclined forward of the vehicle. 85 and a downstream portion 86 extending from the downstream end of the intermediate portion 85 to the rear side in the vehicle width direction.

  A differential ring gear oil receiving portion 90 that receives lubricating oil scattered from the differential ring gear 44 is provided at the upstream end portion of the upstream portion 84 so as to rise from the bottom portion 81. The oil receiving portion 90 for the diff ring gear is provided at a position that overlaps the diff ring gear 44 in the axial direction, whereby the lubrication is scraped up by the rotation of the diff ring gear 44 and scattered from the diff ring gear 44. The oil can be reliably received by the oil receiving portion 90 for the diff ring gear.

  Partition walls 91 and 92 extending toward the rear of the vehicle are provided at both ends in the vehicle width direction of the oil receiving portion 90 for the diff ring gear. These partition walls 91 and 92 allow the oil receiving portion 90 for the diff ring gear to The received lubricating oil is reliably guided to the bottom portion 81 of the rear-side oil path 80 while being regulated so as not to leak from the differential ring gear oil receiving portion 90 to both sides in the vehicle width direction.

  In particular, the front partition wall 91 has a function of guiding the lubricating oil received by the differential ring gear oil receiving portion 90 to the downstream side of the rear oil path 80. Further, the front side partition wall 91 prevents the lubricating oil scattered from the diff ring gear 44 from entering the rear side oil path 80 toward the space close to the front side in the vehicle width direction of the diff ring gear oil receiving portion 90. To the front oil path 100 adjacent to the front side of the rear oil path 80.

  Furthermore, the upstream end of the upstream portion 84 is an open portion 93 that opens to the front side in the vehicle width direction. Therefore, the excess amount of lubricating oil received by the oil receiving portion 90 for the diff ring gear is supplied from the upstream end opening portion 93 of the upstream portion 84 to the front side oil path 100 located below the upstream end opening portion 93. It is like that.

  Due to the functions of the front side partition wall 91 and the upstream end opening portion 93, the lubricating oil scattered from the diff ring gear 44 can be supplied to one of the rear side oil path 80 or the front side oil path 100 in a biased manner. It is suppressed.

  Further, the upstream portion 84 is disposed so as to pass through a space in front of the moving direction at the time of rotation of the upper portion of the parking gear 22 and above the axis of the output shaft 16, and not only the diff ring gear 44 but also the parking gear. Lubricating oil scattered from 22 is also guided to the rear bearings 12 and 26. In order to achieve this purpose effectively, an upstream portion 84 is provided with a parking gear oil receiving portion 94 that receives lubricating oil scattered from the parking gear 22 so as to overlap the parking gear 22 in the axial direction. Has been. The parking gear oil receiving portion 94 is configured by a portion in which the side wall portion 83 on the vehicle rear side extends upward so as to be higher than the upper end of the side wall portion 82 on the vehicle front side. The parking oil receiving portion 94 can effectively receive the lubricating oil scattered from the parking gear 22.

  The parking gear oil receiving portion 94 is also disposed so as to overlap the transfer gear 18 of the output shaft 16 in the axial direction, thereby effectively receiving the lubricating oil scattered from the transfer gear 18. Can be done.

  Further, the rear side oil path 80 can also receive the lubricating oil scattered from the parking gear 22 and the transfer gear 18 toward the upper side of the parking oil receiving portion 94 by the bottom 81 and flowing down the inner surface of the case 2. .

  Further, the upstream portion 84 is provided with an oil reservoir portion 95 in which the bottom portion 81 is recessed downward. The upstream end of the oil reservoir 95 is disposed at a position where the oil receiving portion 90 for the diff ring gear and the diff ring gear 44 overlap in the axial direction, and the downstream end of the oil reservoir 95 is in the axial direction. The parking gear oil receiving portion 94 and the parking gear 22 are disposed in an overlapping position (see FIG. 6). Therefore, even if a large amount of lubricating oil is simultaneously supplied from the diff ring gear 44 and the parking gear 22 to each of the oil receiving portions 90 and 94, a part of the lubricating oil can be temporarily retained in the oil reservoir 95. Therefore, the lubricating oil can be prevented from overflowing from the rear oil path 80.

  Thus, the lubricating oil supplied to the upstream portion 84 of the rear-side oil path 80 due to scattering from the gears 18, 22, 44 passes through the intermediate portion 85 using the downward inclination of the bottom portion 81. To the downstream portion 86.

  The downstream portion 86 of the rear oil path 80 is inserted into the wall of the rear case 3 so as to be connected to the rear side wall oil passage 72 (see FIG. 6). At the downstream end of the downstream portion 86, a notch 88 is provided in the bottom 81, and the lubricating oil that has flowed through the rear oil path 80 to the downstream end falls from the notch 88 and is disposed in the rear side wall oil passage 72. To be supplied.

  The downstream portion 86 is also provided with an oil sump portion 96 formed by recessing the bottom portion 81 downward, and even if a large amount of lubricating oil flows to the downstream portion 86 at the same time, a part of the lubricating portion is removed. By temporarily retaining in the oil reservoir 96, it is possible to prevent the lubricating oil from overflowing from the rear oil path 80.

  The upstream portion 84 and the intermediate portion 85 of the rear-side oil path 80 are provided with protruding portions 98 and 99 that protrude from the side wall portion 83 on the vehicle rear side, respectively, and these protruding portions 98 and 99 are attached to the rear side case 3 by bolts. It is fixed.

  As shown in FIG. 5, the front-side oil path 100 has a floor portion 102 disposed substantially along the horizontal direction at the upstream end portion thereof, and a side wall rising from the front-side end portion in the vehicle width direction of the floor portion 102. Part 104, an oil receiving part 112 for a diff ring gear rising from the vehicle front side end part of floor part 102, and a flange part 108 connected to a corner part on the vehicle front side of floor part 102 and on the front side in the vehicle width direction.

  The floor portion 102 is disposed below the upstream end opening portion 93 and the front side partition wall 91 of the rear side oil path 80 described above, and the lubricating oil falling from the upstream end opening portion 93 and the front side partition wall 91 is removed. It can be received.

  The side wall portion 104 is provided from the rear end portion of the floor portion 102 to the middle portion in the vehicle front-rear direction, and the lubricating oil supplied onto the floor portion 102 leaks out to the front side in the vehicle width direction. There are no restrictions. A protruding portion 106 that protrudes upward is provided at the upper end portion of the side wall portion 104, and the protruding portion 106 is fixed to the front side case 4 with a bolt.

  The oil receiving portion 112 for the diff ring gear is disposed so as to be aligned in the axial direction with the oil receiving portion 90 for the diff ring gear of the rear side oil path 80 at a position overlapping the def ring gear 44 in the axial direction. As a result, the lubricating oil scattered from the diff ring gear 44 can be effectively received by the diff ring gear oil receiving portion 112 and supplied to the front bearings 10 and 24 via the front oil path 100. .

  A partition wall 114 is provided at an end of the differential ring gear oil receiving portion 112 on the rear side in the vehicle width direction. The partition wall 114 is disposed along the vehicle front-rear direction. The width of the partition wall 114 in the vehicle front-rear direction is substantially constant at the upper part 116 of the partition wall 114 and gradually decreases downward at the lower part 118 of the partition wall 114. Is getting bigger. By this partition wall 114, the lubricating oil supplied from the differential ring gear 44 is effectively guided to the flange 108 on the downstream side of the front oil path 100 without leaking to the rear side in the vehicle width direction. Yes.

  The eaves part 108 has, for example, a semicircular cross-sectional shape extending in the vehicle width direction from an open portion between the vehicle front side end part of the side wall part 104 and the vehicle width direction front side end part of the oil receiving part 112 for the diff ring gear. Is formed. The bottom portion of the flange portion 108 is disposed at a lower position than the floor portion 102 so that the lubricating oil falling from the floor portion 102 is received by the flange portion 108.

  The flange portion 108 is inserted into the wall of the front side case 4 so as to be continuous with the oil passage 70 in the front side wall (see FIG. 6). A notch 110 is provided at the downstream end of the flange 108, and the lubricating oil that has flowed through the front oil path 100 to the downstream end falls from the notch 110 and is supplied to the oil passage 70 in the front side wall. It is like that.

  As shown in FIG. 6, the oil supply port 58 for supplying oil into the case 2 is located above the portion of the case 2 that spans the upstream end of the rear oil path 80 and the upstream end of the front oil path 100. It is provided in the part to do. Therefore, the lubricating oil injected into the case 2 from the oil supply port 58 falls directly to the upstream end portion of the rear side oil path 80 and the upstream end portion of the front side oil path 100, and each oil path 80, 100 is caused to fall. Since the bearings 10, 12, 24, and 26 are supplied to each other, initial lack of lubrication can be suppressed.

  The flow of the lubricating oil in the case 2 during normal traveling of the vehicle will be described with reference to FIGS. In this specification, traveling at a vehicle speed of 5 km / h or less is referred to as “very low speed traveling”, and traveling at a higher speed than extremely low speed traveling is referred to as “normal traveling”.

  As shown in FIGS. 6 and 7, during normal running, the diff ring gear 44 rotates at a relatively high speed, so that a sufficient amount of lubricating oil can be secured by the def ring gear 44. Therefore, the lubricating oil scattered from the diff ring gear 44 can be sufficiently supplied to the rear side oil path 80 and the front side oil path 100 located above the diff ring gear 44.

  As a result, the lubricating oil supplied from the differential ring gear 44 to the front-side oil path 100 passes through the front side wall oil passage 70 and supports the front bearings 10 and 24 that support the input shaft 6 and the output shaft 16 of the speed reducer 5. Thus, the lubrication of the front bearings 10 and 24 can be realized satisfactorily.

  On the other hand, the lubricating oil supplied from the diff ring gear 44 to the rear oil path 80 passes through the rear side wall oil passage 72 to the rear bearings 12 and 26 that support the input shaft 6 and the output shaft 16 of the speed reducer 5. As a result, the lubrication of these rear bearings 12 and 26 can be realized satisfactorily.

  Lubricating oil is supplied to the rear oil path 80 not only by scattering from the differential ring gear 44 but also by scattering from the transfer gear 18 and the parking gear 22 provided on the output shaft 16 of the speed reducer 5.

  Further, during normal traveling, the front bearings 10 and 24 disposed relatively close to the diff ring gear 44 are not only supplied with lubricating oil via the front oil path 100 and the oil passage 70 in the front side wall. It is also possible to directly supply the lubricating oil scattered from the diff ring gear 44.

  Next, the flow of the lubricating oil in the case 2 when the vehicle is traveling at an extremely low speed will be described with reference to FIGS. 8 and 9.

  As shown in FIGS. 8 and 9, during extremely low speed traveling, the amount of the lubricating oil scooped up by the diff ring gear 44 decreases as the rotational speed of the diff ring gear 44 decreases. Therefore, the lubricant scattered from the diff ring gear 44 is difficult to reach the rear side oil path 80 and the front side oil path 100 located above the diff ring gear 44.

  Accordingly, when traveling at an extremely low speed, the supply of lubricating oil to the front bearings 10 and 24 via the front-side oil path 100 and the oil passage 70 in the front side wall is likely to be insufficient, but the front bearings 10 and 24 have a differential ring gear 44. Since the lubricating oil splashed from the diff ring gear 44 is directly supplied, the lubrication of the front bearings 10 and 24 can be maintained satisfactorily.

  On the other hand, since the rear bearings 12 and 26 are disposed relatively far away from the diff ring gear 44, the lubricating oil scattered from the diff ring gear 44 is directly supplied when the rotational speed of the diff ring gear 44 is significantly reduced. It is difficult. However, according to the present embodiment, the lubrication of the rear bearings 12 and 26 during extremely low speed traveling can be maintained well for the following reasons.

  First, a part of the lubricating oil scraped up from the differential oil tank 60 by the rotation of the differential ring gear 44 adheres to the parking gear 22 adjacent to the differential ring gear 44 in the axial direction. In particular, since the parking gear 22 is sandwiched between the transfer gear 18 and the output gear 20 on the output shaft 16 and is disposed adjacent to both the gears 18 and 20, the diff ring gear 44 is used even at extremely low speeds. The lubricating oil scattered from the vehicle can be effectively attached to the parking gear 22.

  Further, even during extremely low speed traveling, a part of the lubricating oil scattered from the diff ring gear 44 is supplied to the oil catch tray 68, and the lubricating oil on the oil catch tray 68 is transferred to the transfer gear 8 of the input shaft 6 of the speed reducer 5. And is supplied to the transfer gear 18 of the output shaft 16 that meshes with the transfer gear 8.

  Further, since the rotational speed of the output shaft 16 of the speed reducer 5 is about several times the rotational speed of the diffring gear 44, the parking gear 22 and the transfer gear 18 provided on the output shaft 16 even during extremely low speed traveling. Rotates at a higher rotational speed than the diff ring gear 44.

  Therefore, the lubricating oil scattered from the parking gear 22 and the transfer gear 18 can be effectively supplied to the rear oil path 80 even during extremely low speed traveling. Therefore, in the rear bearings 12 and 26 disposed relatively far from the diff ring gear 44 in the axial direction, the rear side oil path 80 and the rear side wall oil passage 72 are routed from the parking gear 22 and the transfer gear 18. Good lubrication can be achieved by supplying the lubricating oil.

  In addition, since the above configuration can achieve good lubrication even during extremely low speed traveling, it is not necessary to set the liquid level of the differential oil tank 60 high, and the oil storage amount can be reduced. .

  While the present invention has been described with reference to the above-described embodiments, the present invention is not limited to the above-described embodiments.

  For example, in the above-described embodiment, the configuration in which the diff ring gear is used as the first gear that scoops up the lubricating oil stored in the oil storage portion has been described. However, in the present invention, the type of gear used as the first gear is particularly limited. It is not something.

  In the above-described embodiment, the lubricating structure of the power transmission device that is mounted on the electric vehicle and transmits the power input from the motor has been described, but the present invention is a power transmission device that is mounted on a vehicle other than the electric vehicle, That is, the present invention can also be applied to a power transmission device that transmits power input from a driving source (for example, an internal combustion engine) other than a motor.

  Furthermore, in the above-described embodiment, the power transmission device that does not include the speed change mechanism has been described. However, the present invention can also be applied to a power transmission device that includes the speed change mechanism.

  As described above, according to the present invention, in the lubricating structure of the power transmission device that scrapes up the lubricating oil by the rotation of the gear and supplies it to the required lubrication part, the amount of lubricating oil stored in the case of the power transmission device can be reduced. It is possible to achieve good lubrication even when the rotation of the gear that scoops up the lubricating oil is at a low speed, and may be suitably used in the manufacturing industry of this type of power transmission device. .

DESCRIPTION OF SYMBOLS 1 Power transmission device 2 Case 5 Reduction gear 6 Input shaft (3rd axis) of reduction gear
8 Input shaft transfer gear (third gear)
10 Front bearing (lubrication required part)
12 Rear bearing (lubrication required part)
16 Reducer output shaft (second shaft)
18 Output shaft transfer gear (4th gear)
20 Reducer output gear (second gear)
22 Parking gear 24 Front bearing (lubrication required part)
26 Rear bearing (lubrication required)
28 Parking Gear Recess 30 Parking Pole 32 Claw 40 Differential Device 44 Defring Gear (First Gear)
54,56 axle (first axis)
58 Refueling port 60 Differential oil tank (oil reservoir)
61 Oil pan 62 Oil recovery part 64 Partition part 66 Communication port 68 Oil catch tray 80 Rear oil path (first supply path)
90 Oil receiving part for diff ring gear (oil receiving part for first gear)
94 Oil receiving part for parking gear 95 Oil reservoir part 100 Front side oil path (second supply path)
112 Oil receiving part for differential ring gear (oil receiving part for first gear)

Claims (8)

A first shaft provided with a first gear;
A second shaft provided in parallel with the first shaft and at a higher position than the first shaft, and provided with a second gear meshing with the first gear;
A parking gear provided on the second shaft and having a plurality of recesses that engage with the pawls of the parking pole on the outer peripheral surface;
A case for accommodating the first gear, the second gear, and the parking gear;
An oil reservoir is provided at the bottom of the case so that the lower portion of the first gear is immersed, and the lubricant that has been scraped up from the oil reservoir by the rotation of the first gear is contained in the case. A lubrication structure of a power transmission device configured to be supplied to a lubrication required part of
The parking gear is provided adjacent to the second gear so that the lubricating oil scraped up by the rotation of the first gear can be adhered thereto,
An oil supply path that guides the lubricating oil scattered from the parking gear by rotation of the parking gear to a lubrication required portion on the second shaft is forward in the moving direction when the parking gear is rotated and the axis of the second shaft A lubricating structure for a power transmission device, characterized in that the lubricating structure is provided so as to pass through an upper space.   2. An oil receiving portion for a parking gear that receives lubricating oil scattered from the parking gear in the oil supply path is disposed so as to overlap the parking gear in the axial direction. The lubrication structure of the power transmission device described in 1.   3. The oil supply path is provided with an oil reservoir portion recessed downward in a position where the parking gear oil receiving portion and the parking gear overlap in the axial direction. A lubricating structure of the power transmission device described. In the axial direction, the second gear is disposed on one end side with respect to the central portion of the second shaft, and the parking gear is disposed on the other end side of the second shaft with respect to the second gear,
4. The oil supply path according to claim 1, wherein the oil supply path is arranged so as to guide the lubricating oil scattered from the parking gear to a lubrication required portion on the other end side of the second shaft. A lubricating structure for a power transmission device according to any one of the preceding claims. The oil supply path is a first supply path that guides the lubricating oil scattered from the first gear to the lubrication required part on the other end side of the second shaft,
As an oil supply path different from the first supply path, there is provided a second supply path that guides the lubricating oil scattered from the first gear to the lubrication required portion on the one end side of the second shaft,
An oil receiving portion for a first gear that receives lubricating oil scattered from the first gear is provided at each upstream end of the first supply passage and the second supply passage,
The oil receiving portions for the first gears of the first supply path and the second supply path are arranged in the axial direction so as to overlap with the first gear in the axial direction,
The oil receiving portion for the first gear of the first supply path is provided with a partition wall that guides the lubricating oil supplied from the first gear to the downstream side of the first supply path,
5. A partition wall for guiding the lubricating oil supplied from the first gear to the downstream side of the second supply path is provided in the oil receiving portion for the first gear of the second supply path. The lubrication structure of the power transmission device described in 1.   6. The fuel supply port according to claim 1, wherein an oil supply port for supplying oil into the case is provided in a portion of the case located above the upstream end portion of the oil supply path. A lubricating structure for the power transmission device according to the item. A third gear is provided on the third shaft connected to the drive source;
A fourth gear meshing with the third gear is provided on the second shaft;
The power transmission device lubrication according to any one of claims 1 to 6, wherein the parking gear is disposed between the second gear and the fourth gear on the second shaft. Construction. An oil pan that receives lubricating oil provided for lubrication in the case is inclined downward toward the rear of the vehicle in a vehicle-mounted state and provided on the front side of the vehicle compared to the oil reservoir,
In the case, an oil recovery part that receives and recovers lubricating oil used for lubrication by the oil pan and a partition part that separates the oil storage part are provided,
8. The communication port according to claim 1, wherein a communication port that communicates the oil recovery portion and the oil storage portion is provided at a rear portion of the partition wall portion in a vehicle-mounted state. Lubrication structure of the power transmission device.

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