US 2019/0199176 A1 · Electric Drive Device and Electric Power Steering Device

Abstract

Provided is an electric drive device in which heat-dissipating sections (15A) (15B) that transfer at least heat generated by a power supply circuit unit (17) and power conversion circuit units (16) to a motor housing (11) are formed on an end surface section (15) of the motor housing (11) on the opposite side from an output section of a rotating shaft (23) of an electric motor. In addition, a watertight lid member (35) that covers a through hole (41) through which the rotating shaft passes and the end of the rotating shaft (23) from the exterior is attached to the end surface section (15) around the through hole (41), and a waterproof breathable membrane (44) that prevents the passage of moisture while allowing the passage of air and water vapor is provided to part of the watertight lid member.

Claims15

Dependent claims

1-14. (canceled)

An electric drive device comprising:

a motor housing structured to house an electric motor, wherein the motor housing includes an end face part including a through hole, wherein an end part of a rotating shaft of the electric motor opposite to an output part of the rotating shaft extends through the through hole, and wherein the electric motor is structured to drive a controlled object of a mechanical system;
and
an electronic control part housed in an accommodation space formed by a cover attached to the end face part of the motor housing, wherein the electronic control part is placed adjacent to the end face part, and configured to drive the electric motor, wherein the electronic control part includes a control circuit part, a power supply circuit part, and a power conversion circuit part;
wherein
the end face part of the motor housing includes a power conversion part heat dissipation region and a power supply part heat dissipation region;
the power conversion circuit part is mounted to the power conversion part heat dissipation region in a manner to allow generated heat of the power conversion circuit part to be transferred to the motor housing via the power conversion part heat dissipation region;
the power supply circuit part is mounted to the power supply part heat dissipation region in a manner to allow generated heat of the power supply circuit part to be transferred to the motor housing via the power supply part heat dissipation region;
the electric drive device further comprises a watertight cover attached to a portion of the end face part of the motor housing around the through hole through which the rotating shaft extends, wherein the watertight cover covers the through hole and the end part of the rotating shaft from outside and has a watertight function;
and
the watertight cover includes a waterproof breathable member structured to suppress passing of water and allow passing of air and water vapor.

7 more elements

An electric power steering device comprising:

an electric motor structured to apply a steering assist force to a steering shaft, depending on an output from a torque sensor, wherein the torque sensor is structured to sense a direction of rotation of the steering shaft and a rotating torque applied to the steering shaft;
a motor housing structured to house the electric motor, wherein the motor housing includes an end face part including a through hole, wherein an end part of a rotating shaft of the electric motor opposite to an output part of the rotating shaft extends through the through hole;
and
an electronic control part housed in an accommodation space formed by a cover attached to the end face part of the motor housing, wherein the electronic control part is placed adjacent to the end face part, and configured to drive the electric motor, wherein the electronic control part includes a control circuit part, a power supply circuit part, and a power conversion circuit part;
wherein
the end face part of the motor housing includes a power conversion part heat dissipation region and a power supply part heat dissipation region;
the power conversion circuit part is mounted to the power conversion part heat dissipation region in a manner to allow generated heat of the power conversion circuit part to be transferred to the motor housing via the power conversion part heat dissipation region;
the power supply circuit part is mounted to the power supply part heat dissipation region in a manner to allow generated heat of the power supply circuit part to be transferred to the motor housing via the power supply part heat dissipation region;
the electric drive device further comprises a watertight cover attached to a portion of the end face part of the motor housing around the through hole through which the rotating shaft extends, wherein the watertight cover covers the through hole and the end part of the rotating shaft from outside and has a watertight function;
and
the watertight cover includes a waterproof breathable member structured to suppress passing of water and allow passing of air and water vapor.

8 more elements

Dependencies are inferred from the claim text.

Facts

Application

16/329,207Filed 31 Jul 2017

Priority

JP 2016-1714532 Sep 2016

Published

27 Jun 2019

Term ends

Not estimatedThe source records don’t support an estimate.

Classification9 codes

H02K 11/33
Structural association with control circuits or drive circuits: drive circuits, e.g. power electronics
B62D 5/0406
Characterised by constructional features, e.g. common housing for motor and gear box: including housing for electronic control unit
B62D 5/046
Characterised by control features of the drive means as such: controlling the motor
H02K 5/10
Casings or enclosures characterised by the shape, form or construction thereof: with arrangements for protection from ingress, e.g. water or fingers

Electric Drive Device and Electric Power Steering Device

Life of this patent

Electric Drive Device and Electric Power Steering Device

Life of this patent

Abstract

Claims15