Electric vehicle

Patent metadata

Field	Value
Publication number	US-9415691-B2
Application number	US-201313849721-A
Country	US
Kind code	B2
Filing date	Mar 25, 2013
Priority date	Mar 30, 2012
Publication date	Aug 16, 2016
Grant date	Aug 16, 2016

Abstract

An electric vehicle can include a power unit including a speed reduction device coupled to a motor output shaft. Two systems can be provided which are a drive-power transmission path to transmit rotation of a motor to a wheel hub, and a regenerative-power transmission path to transmit rotation of the hub to the motor. A drive-side one-way clutch is provided between the hub and a second internal gear being the final-stage gear in the drive-power transmission path and is configured to transmit rotation of the drive-side final-stage gear to the hub. A regeneration-side one-way clutch is provided between the hub and a regeneration-side first-stage gear and is configured to transmit rotation of the hub to the regeneration-side first-stage gear.

First claim

The invention claimed is:

1. An electric vehicle, comprising:
a power unit including a motor and a speed reduction device coupled to a motor output shaft, wherein
the speed reduction device having gear trains of two systems respectively forming a drive-power transmission path to transmit rotation of the motor to an output rotation member, and a regenerative-power transmission path to transmit rotation of the output rotation member to the motor, the speed reduction device including
a drive-side one-way clutch provided in the drive-power transmission path at a portion between a drive-side final-stage gear and the output rotation member, and configured to transmit rotation of the drive-side final-stage gear to the output rotation member; and
a regeneration-side one-way clutch provided in the regenerative-power transmission path at a portion between the output rotation member and a regeneration-side first-stage gear and configured to transmit rotation of the output rotation member to the regeneration-side first-stage gear, wherein
gears among pluralities of gears respectively forming the gear trains of the two systems are disposed on a common shaft in such a way as to rotate together,
wherein the drive-side final-stage gear and the regeneration-side first-stage gear are separate from each other, and
wherein the drive-side final-stage gear and the regeneration-side first-stage gear are configured to operate independently of each other.

2. An electric vehicle, comprising:
a power unit including a motor and a speed reduction device coupled to a motor output shaft, wherein
the speed reduction device having gear trains of two systems respectively forming a drive-power transmission path to transmit rotation of the motor to an output rotation member, and a regenerative-power transmission path to transmit rotation of the output rotation member to the motor, the speed reduction device including
a drive-side one-way clutch provided in the drive-power transmission path at a portion between a drive-side final-stage gear and the output rotation member, and configured to transmit rotation of the drive-side final-stage gear to the output rotation member; and
a regeneration-side one-way clutch provided in the regenerative-power transmission path at a portion between the output rotation member and a regeneration-side first-stage gear and configured to transmit rotation of the output rotation member to the regeneration-side first-stage gear, wherein
gears among pluralities of gears respectively forming the gear trains of the two systems are disposed on a common shaft in such a way as to rotate together,

wherein the power unit is provided in a wheel hub forming the output rotation member,
wherein the gear trains include
a sun gear disposed on the motor output shaft,
a planetary gear including a large-gear portion meshing with the sun gear and a small-gear portion configured to rotate together with the large-gear portion,
a drive-side internal gear forming the drive-side final-stage gear and meshing with the small-gear portion, the gear trains also including
a regeneration-side internal gear forming the regeneration-side first-stage gear and meshing with the large-gear portion, wherein
the drive-side one-way clutch is disposed between the drive-side internal gear and the wheel hub, and wherein
the regeneration-side one-way clutch is disposed between the regeneration-side internal gear and the wheel hub.

3. The electric vehicle according to claim 2 , wherein the drive-side internal gear is smaller in diameter than the regeneration-side internal gear.

4. The electric vehicle according to claim 2 , wherein the planetary gear is supported on a carrier fastened to a stator of the motor.

5. The electric vehicle according to claim 2 , wherein the wheel hub includes a first hub part located on one lateral side of a vehicle body and a second hub part located on another lateral side of the vehicle body and connected to the first hub part.

6. The electric vehicle according to claim 5 , wherein the drive-side internal gear is supported on the second hub part, and the regeneration-side internal gear is supported on the first hub part.

7. The electric vehicle according to claim 6 , further comprising:
a drive-side-internal-gear supporting member supporting an outer periphery of the drive-side internal gear; and
a regeneration-side-internal-gear supporting member supporting an outer periphery of the regeneration-side internal gear,
wherein the drive-side-internal-gear supporting member and the regeneration-side-internal-gear supporting member are fastened to an inner periphery of the wheel hub.

8. The electric vehicle according to claim 7 , wherein
the drive-side-internal-gear supporting member is disposed inside the wheel hub and fastened to the wheel hub with a fastening member inserted to the wheel hub from inside, and
the regeneration-side-internal-gear supporting member is located inside the wheel hub and fastened to the wheel hub with a fastening member inserted to the wheel hub from outside.

9. The electric vehicle according to claim 7 , wherein
the first hub part includes a large-diameter portion and a small-diameter portion,
the regeneration-side-internal-gear supporting member is disposed on an inner surface of a wall portion of the wheel hub extending in a radial direction thereof and connecting the large-diameter portion and the small-diameter portion, and wherein
the fastening member penetrates the wall portion from an outer surface thereof and is joined to the regeneration-side-internal-gear supporting member.

10. An electric vehicle having a power unit including a motor and a speed reduction device coupled to a motor output shaft, wherein the speed reduction device has gear trains of two systems are respectively forming a drive-power transmission path to transmit rotation of the motor to an output rotation member, and a regenerative-power transmission path to transmit rotation of the output rotation member to the motor, the speed reduction device comprising:
drive-side clutch means for transmitting rotation of a drive-side final-stage gear to the output rotation member, said drive-side clutch means being disposed in the drive-power transmission path between the drive-side final stage gear and the output rotation member; and
regeneration-side clutch means for transmitting rotation of the output rotation member to a regeneration-side first-stage gear, said regeneration-side clutch means being disposed in the regenerative-power transmission path between the output rotation member and the regeneration-side first-stage gear, wherein
gear means for transmitting rotational power respectively form the gear trains of the two systems, said gear means being disposed on a common shaft so as to rotate together,
wherein the drive-side final-stage gear and the regeneration-side first-stage gear are separate from each other, and
wherein the drive-side final-stage gear and the regeneration-side first-stage gear are configured to operate independently of each other.

11. An electric vehicle having a power unit including a motor and a speed reduction device coupled to a motor output shaft, wherein the speed reduction device has gear trains of two systems are respectively forming a drive-power transmission path to transmit rotation of the motor to an output rotation member, and a regenerative-power transmission path to transmit rotation of the output rotation member to the motor, the speed reduction device comprising:
drive-side clutch means for transmitting rotation of a drive-side final-stage gear to the output rotation member, said drive-side clutch means being disposed in the drive-power transmiss

Assignees

• Honda Motor Co Ltd

Inventors

• Murakami Hisashi
• Yoshino Tsutomu
• Aoki Koji

Classifications

• Y02T10/72

  Electric energy management in electromobility · CPC title

• B62K11/10

  characterised by the engine being over or beside driven rear wheel · CPC title

• Y10T477/32

  Cross-Sectional Technologies · mapped topic

• Y02T10/7275

  Cross-Sectional Technologies · mapped topic

• B60L2200/12

  Bikes · CPC title