US-20260128650-A1 - ROTOR

US20260128650A1US 20260128650 A1US20260128650 A1US 20260128650A1US-20260128650-A1

Abstract

This rotor includes an end plate and a supply channel provided separately from the end plate. The supply channel includes a boundary channel extending along a boundary between an outer end face of the end plate and an end plate contact surface of an axial movement restricting portion, a first connection channel provided in a rotor shaft and connecting a hollow portion and the boundary channel, and a second connection channel provided in the end plate and connecting the boundary channel and a core channel.

Inventors

Akira Matsumoto
Hiroyuki Ono
Takuma Mori
Ryosuke Nakao

Assignees

AISIN CORPORATION

Dates

Publication Date: 20260507
Application Date: 20230929
Priority Date: 20221027

Claims (6)

1 . A rotor comprising: a rotor shaft extending in an axial direction and including a hollow portion through which a coolant is supplied; a rotor core including a shaft insertion hole into which the rotor shaft is inserted, and a core channel that extends in the axial direction and through which the coolant flows; an end plate including an inner end face in contact with one end face of the rotor core in the axial direction, and an outer end face opposite to the inner end face in the axial direction; an axial movement restricting portion that is provided separately from the end plate, includes an end plate contact surface in contact with the outer end face of the end plate, and restricts movement of the end plate and the rotor core in the axial direction relative to the rotor shaft by contact with the outer end face; and a supply channel through which the coolant is supplied from the hollow portion to the core channel, wherein the supply channel includes: a boundary channel extending along a boundary between the outer end face of the end plate and the end plate contact surface of the axial movement restricting portion; a first connection channel provided in the rotor shaft and connecting the hollow portion and the boundary channel; and a second connection channel provided in the end plate and connecting the boundary channel and the core channel.
2 . The rotor according to claim 1 , wherein in a radial direction of the rotor core, a length from an outer circumferential surface of the rotor shaft to an outer circumferential surface of the axial movement restricting portion is smaller than half of a length from the outer circumferential surface of the rotor shaft to an outer circumferential surface of the rotor core.
3 . The rotor according to claim 1 , wherein the end plate includes a groove portion recessed from the outer end face toward the rotor core, and the boundary channel is formed by the groove portion and the end plate contact surface of the axial movement restricting portion.
4 . The rotor according to claim 1 , wherein the axial movement restricting portion is a fixed member positioned in the axial direction by being fixed to the rotor shaft, and a set of the end plate and the fixed member is provided on both one side and the other side in the axial direction of the rotor core.
5 . The rotor according to claim 1 , wherein the rotor core includes: a magnet hole in which a permanent magnet is disposed; and a slit provided on a radially inner side of the magnet hole and formed by a through hole extending in the axial direction of the rotor core, and the core channel through which the coolant flows is formed by the slit.
6 . The rotor according to claim 1 , further comprising a discharge member including a discharge channel through which the coolant supplied from the supply channel on one side in the axial direction of the rotor core is discharged from the other side in the axial direction, wherein the discharge channel includes an inclined surface that is inclined toward a coil end portion of a stator so that the discharged coolant is discharged toward the coil end portion.

Description

TECHNICAL FIELD The present disclosure relates to a rotor. BACKGROUND ART Hitherto, there is known a rotor having a channel through which a coolant flows. Such a rotor is disclosed in, for example, Japanese Unexamined Patent Application Publication No. 2020-120425 (JP 2020-120425 A). JP 2020-120425 A discloses a rotor including a rotor shaft having a hollow portion through which a coolant is supplied, a rotor core having cooling channels that extend in an axial direction and through which the coolant flows, and two end plates in contact with each other and provided at one axial end of the rotor core. The rotor core has magnet holes in which permanent magnets are disposed on a radially outer side of the cooling channels. Channels for guiding the coolant in the hollow portion of the rotor shaft to the cooling channels of the rotor core are provided at the boundary between the two end plates. The rotor includes a movement restricting portion that is in contact with the end plate on an axially outer side and restricts axial movement of the two end plates and the rotor core. RELATED ART DOCUMENTS Patent Documents Patent Document 1: Japanese Unexamined Patent Application Publication No. 2020-120425 (JP 2020-120425 A) SUMMARY OF THE DISCLOSURE Problem to be Solved by the Disclosure In the rotor described in JP 2020-120425 A, two (or more) end plates whose axial movement is restricted by the movement restricting portion are required to guide the coolant in the hollow portion of the rotor shaft into the cooling channels of the rotor core. It is desirable to simplify the device structure for causing the coolant to flow into the cooling channels of the rotor core extending in the axial direction. The present disclosure has been made to solve the above problem, and one object of the present disclosure is to provide a rotor that can have a simplified device structure for causing a coolant to flow into a core channel of a rotor core extending in an axial direction without providing a plurality of (two) end plates on either side in the axial direction. Means for Solving the Problem In order to achieve the above object, a rotor according to one aspect of the present disclosure includes: a rotor shaft extending in an axial direction and including a hollow portion through which a coolant is supplied; a rotor core including a shaft insertion hole into which the rotor shaft is inserted, and a core channel that extends in the axial direction and through which the coolant flows; an end plate including an inner end face in contact with one end face of the rotor core in the axial direction, and an outer end face opposite to the inner end face in the axial direction; an axial movement restricting portion that is provided separately from the end plate, includes an end plate contact surface in contact with the outer end face of the end plate, and restricts movement of the end plate and the rotor core in the axial direction relative to the rotor shaft by contact with the outer end face; and a supply channel through which the coolant is supplied from the hollow portion to the core channel. The supply channel includes: a boundary channel extending along a boundary between the outer end face of the end plate and the end plate contact surface of the axial movement restricting portion; a first connection channel provided in the rotor shaft and connecting the hollow portion and the boundary channel; and a second connection channel provided in the end plate and connecting the boundary channel and the core channel. As described above, the rotor according to the one aspect of the present disclosure includes the axial movement restricting portion that restricts the movement of the end plate and the rotor core in the axial direction relative to the rotor shaft, and the supply channel through which the coolant is supplied from the hollow portion to the core channel. The supply channel includes the boundary channel extending along the boundary between the outer end face of the end plate and the end plate contact surface of the axial movement restricting portion, the first connection channel provided in the rotor shaft and connecting the hollow portion and the boundary channel, and the second connection channel provided in the end plate and connecting the boundary channel and the core channel. Therefore, the boundary channel of the supply channel for introducing the coolant from the hollow portion of the rotor shaft to the core channel extending in the axial direction of the rotor core can be formed using the one end plate and the axial movement restricting portion that is the existing component. Thus, the number of end plates on either side in the axial direction can be reduced from two to one compared to the conventional technology. Accordingly, the device structure for causing the coolant to flow into the core channel of the rotor core extending in the axial direction can be simplified without providing a plurality of (two) end plates on either