Power transmission apparatus for hybrid vehicle

Patent metadata

Field	Value
Publication number	US-9358971-B2
Application number	US-201213420481-A
Country	US
Kind code	B2
Filing date	Mar 14, 2012
Priority date	Mar 17, 2011
Publication date	Jun 7, 2016
Grant date	Jun 7, 2016

Abstract

A power transmission apparatus for a hybrid vehicle. An engine output shaft and a motor output shaft are coupled to a primary shaft of a continuously variable transmission installed in the power transmission apparatus. An output clutch is disposed between an output transmission shaft coupled to a drive wheel and a secondary shaft in order to switch these shafts between a coupled state and a released state, and a drive changeover clutch is disposed between the primary shaft and the output transmission shaft in order to switch these shafts between a coupled state and a released state. In a direct coupling mode where the output clutch is released and the drive changeover clutch is coupled, an engine output is transmitted to the drive wheel without passing through the continuously variable transmission.

First claim

What is claimed is:

1. A power transmission apparatus for a hybrid vehicle that transmits an engine output and a motor output to a drive wheel, the power transmission apparatus comprising:
a continuously variable transmission that includes a primary shaft coupled to an engine output shaft and a motor output shaft, and a secondary shaft to which a rotation of the primary shaft is transmitted after being varied continuously by a power transmission element;
an output clutch that is disposed between an output transmission shaft coupled to the drive wheel and the secondary shaft in order to switch the secondary shaft and the output transmission shaft to a coupled state in which a coupling is formed therebetween and a released state in which the coupling is released; and
a drive changeover clutch that is disposed between the primary shaft and the output transmission shaft in order to switch the primary shaft and the output transmission shaft to a coupled state in which a coupling is formed therebetween and a released state in which the coupling is released,
wherein, in a direct coupling mode where the output clutch is released and the drive changeover clutch is coupled, at least one of the engine output and the motor output is transmitted to the drive wheel without passing through the continuously variable transmission, and
wherein the primary shaft is coupled to one end of the motor output shaft, and the drive changeover clutch is coupled to another end of the motor output shaft.

2. The power transmission apparatus for a hybrid vehicle according to claim 1 , wherein, in a shift mode where the output clutch is engaged and the drive changeover clutch is released, at least one of the engine output and the motor output is transmitted to the drive wheel via the continuously variable transmission.

3. The power transmission apparatus for a hybrid vehicle according to claim 2 , wherein an electric motor including the motor output shaft is a motor/generator, and
in the direct coupling mode where the output clutch is released and the drive changeover clutch is coupled, the electric motor is driven by the drive wheel to collect regenerative energy.

4. The power transmission apparatus for a hybrid vehicle according to claim 3 , wherein the output transmission shaft includes:
a transfer shaft coupled to the drive changeover clutch to be coaxial with the motor output shaft;
a rear wheel output shaft that is coupled to the transfer shaft via a transfer clutch and transmits power to a rear wheel; and
a front wheel output shaft that is coupled to the transfer shaft and transmits power to a front wheel.

5. The power transmission apparatus for a hybrid vehicle according to claim 2 , wherein the output transmission shaft includes:
a transfer shaft coupled to the drive changeover clutch to be coaxial with the motor output shaft;
a rear wheel output shaft that is coupled to the transfer shaft via a transfer clutch and transmits power to a rear wheel; and
a front wheel output shaft that is coupled to the transfer shaft and transmits power to a front wheel.

6. The power transmission apparatus for a hybrid vehicle according to claim 1 , wherein an electric motor including the motor output shaft is a motor/generator, and
in the direct coupling mode where the output clutch is released and the drive changeover clutch is coupled, the electric motor is driven by the drive wheel to collect regenerative energy.

7. The power transmission apparatus for a hybrid vehicle according to claim 6 , wherein the output transmission shaft includes:
a transfer shaft coupled to the drive changeover clutch to be coaxial with the motor output shaft;
a rear wheel output shaft that is coupled to the transfer shaft via a transfer clutch and transmits power to a rear wheel; and
a front wheel output shaft that is coupled to the transfer shaft and transmits power to a front wheel.

8. The power transmission apparatus for a hybrid vehicle according to claim 1 , wherein the output transmission shaft includes:
a transfer shaft coupled to the drive changeover clutch to be coaxial with the motor output shaft;
a rear wheel output shaft that is coupled to the transfer shaft via a transfer clutch and transmits power to a rear wheel; and
a front wheel output shaft that is coupled to the transfer shaft and transmits power to a front wheel.

9. A power transmission apparatus for a hybrid vehicle that transmits an engine output and a motor output to a drive wheel including at least one of a front wheel and a rear wheel, the power transmission apparatus comprising:
a continuously variable transmission that includes a primary shaft coupled to an engine output shaft and a motor output shaft, and a secondary shaft to which a rotation of the primary shaft is transmitted after being varied continuously by a power transmission element;
an output clutch that is disposed between an output transmission shaft coupled to the drive wheel and the secondary shaft in order to switch the secondary shaft and the output transmission shaft to a coupled state in which a coupling is formed therebetween and a released state in which the coupling is released; and
a drive changeover clutch that is disposed between the primary shaft and the output transmission shaft in order to switch the primary shaft and the output transmission shaft to a coupled state in which a coupling is formed therebetween and a released state in which the coupling is released,
wherein, in a direct coupling mode where the output clutch is released and the drive changeover clutch is coupled, at least one of the engine output and the motor output is transmitted to the drive wheel without passing through the continuously variable transmission, and
wherein the output transmission shaft includes:
a transfer shaft coupled to the drive changeover clutch to be coaxial with the motor output shaft;
a front wheel output shaft that is coupled to the transfer shaft and transmits power to the front wheel; and,
a rear wheel output shaft that is coupled to the transfer shaft via a transfer clutch and transmits power to the rear wheel.

10. A power transmission apparatus for a hybrid vehicle that transmits an engine output and a motor output to a drive wheel including at least one of a front wheel and a rear wheel, the power transmission apparatus comprising:
a continuously variable transmission that includes a primary shaft coupled to an engine output shaft and a motor output shaft, and a secondary shaft to which a rotation of the primary shaft is transmitted after being varied continuously by a power transmission element;
an output clutch that is disposed between an output transmission shaft coupled to the drive wheel and the secondary shaft in order to switch the secondary shaft and the output transmission shaft to a coupled state in which a coupling is formed therebetween and a released state in which the coupling is released; and
a drive changeover clutch that is disposed between the primary shaft and the output transmission shaft in order to switch the primary shaft and the output transmission shaft to a coupled state in which a coupling is formed therebetween and a released state in which the coupling is released,
wherein, in a direct coupling mode where the output clutch is released and the drive changeover clutch is coupled, at least one of the engine output and the motor output is transmitted to the drive wheel without passing through the continuously variable transmission, and
wherein the output transmission shaft includes:
a transfer shaft coupled to the drive changeover clutch to be coaxial with the motor output shaft; and
a front wheel output shaft that is coupled to the transfer shaft and transmits power

Assignees

• Oki Shogo
• Fuji Heavy Ind Ltd

Inventors

• Oki Shogo

Classifications

• Y02T10/62

  Hybrid vehicles · CPC title

• B60W20/00

  Control systems specially adapted for hybrid vehicles {(hybrid vehicle design, B60K6/00; electric vehicles B60L)} · CPC title

• B60W10/02 Primary

  including control of driveline clutches · CPC title

• Y02T10/626

  Cross-Sectional Technologies · mapped topic

• Y02T10/6221

  Cross-Sectional Technologies · mapped topic