US-20260126108-A1 - VEHICULAR DRIVE DEVICE

US20260126108A1US 20260126108 A1US20260126108 A1US 20260126108A1US-20260126108-A1

Abstract

A vehicular drive device includes a mechanism that transmits drive force from a source to a wheel via a shaft member, and a case housing the mechanism and at least a portion of the shaft member, the case including a gear case part in which oil scraped up by rotation of a gear is accumulated, and a wall part that bounds at least a lower side of a space around the shaft member and extends along a direction of the shaft member, a space around the shaft member has one side in an extending direction communicating with an inside of the gear case part, and has another side in the extending direction including an object disposition space with an object to be lubricated, or communicating with the object disposition space, and oil is supplied to the object in or via a space around the shaft member.

Inventors

Yuki KUMIKAWA
Motohiro TSUGE
Tomoyuki Suzuki

Assignees

AISIN CORPORATION

Dates

Publication Date: 20260507
Application Date: 20230927
Priority Date: 20221007

Claims (13)

1 . A vehicular drive device comprising: a transmission mechanism that transmits drive force from a drive source to a wheel via a shaft member; and a case that houses the transmission mechanism and at least a portion of the shaft member, wherein the case includes a gear case part in which oil that is able to be scraped up by rotation of a gear of the transmission mechanism is accumulated, and a wall part that bounds at least a lower side of a space around the shaft member and extends along an extending direction of the shaft member, a space around the shaft member has one side in an extending direction of the shaft member communicating with an inside of the gear case part, and has another side in the extending direction of the shaft member including an object disposition space in which an object to be lubricated by oil is disposed, or communicating with the object disposition space, and oil scraped up by rotation of a gear of the transmission mechanism is supplied to the object to be lubricated that is in a space around the shaft member, or to the object to be lubricated via a space around the shaft member.
2 . The vehicular drive device according to claim 1 , wherein a surface of the wall part, the surface facing a lower side of the shaft member, or an outer peripheral surface of the shaft member is lower in height on the another side of the shaft member in an extending direction than on the one side of the shaft member in the extending direction.
3 . The vehicular drive device according to claim 2 , wherein the surface of the wall part or the outer peripheral surface of the shaft member includes a tilted surface or step that forms a height difference between the another side and the one side.
4 . The vehicular drive device according to claim 1 , wherein the one side of the shaft member in an extending direction is supported by the case via a first bearing, and the case includes, on a radially outer side of the first bearing and above an axial center of the shaft member, a cavity part that allows a space around the shaft member and an inside of the gear case part to communicate with each other.
5 . The vehicular drive device according to claim 1 , wherein the another side of the shaft member in an extending direction is supported by the case via a second bearing, and the object to be lubricated includes the second bearing.
6 . The vehicular drive device according to claim 1 , wherein the case includes a communication path for returning oil used for lubrication of the object to be lubricated, into an inside of the gear case part, and the wall part includes a vent or notch that allows the object disposition space to communicate with the communication path.
7 . The vehicular drive device according to claim 1 , further comprising a rotating electrical machine that forms the drive source, wherein the transmission mechanism includes a deceleration mechanism and a differential gear mechanism, the case houses the rotating electrical machine, the deceleration mechanism, the differential gear mechanism, and the shaft member, the gear is a ring gear of the differential gear mechanism, and the wall part extends radially outer side of the rotating electrical machine.
8 . The vehicular drive device according to claim 1 , wherein the wall part has a form of a peripheral wall part that bounds a space around the shaft member over an entire circumference in at least a partial section in an extending direction of the shaft member, and an inner diameter of the peripheral wall part and an outer diameter of the shaft member increase toward the one side to the another side in an extending direction of the shaft member.
9 . The vehicular drive device according to claim 2 , wherein the wall part has a form of a peripheral wall part that bounds a space around the shaft member over an entire circumference in at least a partial section in an extending direction of the shaft member, and an inner diameter of the peripheral wall part and an outer diameter of the shaft member increase toward the one side to the another side in an extending direction of the shaft member.
10 . The vehicular drive device according to claim 3 , wherein the wall part has a form of a peripheral wall part that bounds a space around the shaft member over an entire circumference in at least a partial section in an extending direction of the shaft member, and an inner diameter of the peripheral wall part and an outer diameter of the shaft member increase toward the one side to the another side in an extending direction of the shaft member.
11 . The vehicular drive device according to claim 4 , wherein the wall part has a form of a peripheral wall part that bounds a space around the shaft member over an entire circumference in at least a partial section in an extending direction of the shaft member, and an inner diameter of the peripheral wall part and an outer diameter of the shaft member increase toward the one side to the another side in an extending direction of the shaft member.
12 . The vehicular drive device according to claim 5 , wherein the wall part has a form of a peripheral wall part that bounds a space around the shaft member over an entire circumference in at least a partial section in an extending direction of the shaft member, and an inner diameter of the peripheral wall part and an outer diameter of the shaft member increase toward the one side to the another side in an extending direction of the shaft member.
13 . The vehicular drive device according to claim 6 , wherein the wall part has a form of a peripheral wall part that bounds a space around the shaft member over an entire circumference in at least a partial section in an extending direction of the shaft member, and an inner diameter of the peripheral wall part and an outer diameter of the shaft member increase toward the one side to the another side in an extending direction of the shaft member.

Description

TECHNICAL FIELD The present disclosure relates to a vehicular drive device. BACKGROUND ART A technique is known in which a case forming a first housing chamber that houses a rotating electrical machine and a second housing chamber that houses a transmission mechanism are provided, and oil accumulated in a lower portion of the second housing chamber is scraped up by rotation of a gear of the transmission mechanism and supplied to various bearings of the transmission mechanism. CITATIONS LIST Patent Literature Patent Literature 1: JP 2021-112052 A SUMMARY OF DISCLOSURE Technical Problems However, in a conventional technique as described above, the oil scraped up by the rotation of the gear of the transmission mechanism is not utilized for lubrication or the like of an end portion of a shaft member (for example, an end portion of an intermediate shaft connected to a differential gear mechanism, the portion being on a side far from the differential gear mechanism). Accordingly, in one aspect, the present disclosure intends to supply oil scraped up by rotation of a gear of a transmission mechanism to an end portion of a shaft member. Solutions to Problems In one aspect, there is provided a vehicular drive device including a transmission mechanism that transmits drive force from a drive source to a wheel via a shaft member, anda case that houses the transmission mechanism and at least a portion of the shaft member, in whichthe case includesa gear case part in which oil that is able to be scraped up by rotation of a gear of the transmission mechanism is accumulated, anda wall part that bounds at least a lower side of a space around the shaft member and extends along an extending direction of the shaft member,a space around the shaft member has one side in an extending direction of the shaft member communicating with an inside of the gear case part, and has another side in the extending direction of the shaft member including an object disposition space in which an object to be lubricated by oil is disposed, or communicating with the object disposition space, andoil scraped up by rotation of a gear of the transmission mechanism is supplied to the object to be lubricated that is in a space around the shaft member, or to the object to be lubricated via a space around the shaft member. Advantageous Effects of Disclosure In one aspect, according to the present disclosure, it is possible to supply the oil scraped up by the rotation of the gear of the transmission mechanism to an end portion of the shaft member. BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a schematic top view showing a state of a vehicular drive device mounted on a vehicle. FIG. 2 is a cross-sectional view of the vehicular drive device. FIG. 2A is a skeleton diagram illustrating the vehicular drive device. FIG. 3 is a side view from an A1 side, schematically showing the vehicular drive device according to the present embodiment. FIG. 4 is a perspective view of a channel forming member. FIG. 5 is an enlarged view of a portion Q6 in FIG. 2. FIG. 6 is a side view from an A2 side, schematically showing the vehicular drive device according to the present embodiment. FIG. 7 is a perspective view from an A2 side, schematically showing the vehicular drive device according to the present embodiment. DESCRIPTION OF EMBODIMENTS Hereinafter, each embodiment will be described in detail with reference to the accompanying drawings. Note that dimension ratios in the drawings are merely examples and are not limited thereto, and shapes and the like in the drawings may be partially exaggerated for convenience of description. In the following description, a Y direction (refer to FIG. 3 and the like) correspond to an up-down direction in a state where a vehicular drive device 100 is in use, that is, an up-down direction with respect to an orientation in which the vehicular drive device 100 in use is disposed. Then, a Y1 side and a Y2 side correspond to an upper side and a lower side along the Y direction. Note that the up-down direction is not necessarily parallel to a vertical direction, and it is only required that a vertical direction component is predominant. Furthermore, orientations of respective members in the following description represent orientations in a state where the respective members are fitted to the vehicular drive device 100. Furthermore, terms related to dimensions, disposition orientation, disposition position, and the like of each member are concepts including a state of those having a difference due to an error (an allowable error in manufacturing). An A direction (refer to FIG. 2 and the like) corresponds to an axial direction, and an A1 side and an A2 side along the A direction are defined in FIG. 2 and the like. Furthermore, an X direction (refer to FIG. 3 and the like) is a direction orthogonal to both the A direction and the Y direction, and an X1 side and an X2 side along the X direction are defined in FIG. 3 and the like. In the present specificati