Drive apparatus for a vehicle

Patent metadata

Field	Value
Publication number	US-9676267-B2
Application number	US-201113137925-A
Country	US
Kind code	B2
Filing date	Sep 21, 2011
Priority date	Sep 29, 2010
Publication date	Jun 13, 2017
Grant date	Jun 13, 2017

Abstract

A drive apparatus for a vehicle includes an engine output system that outputs power from an engine and a power transmission system that transmits the power from the engine output system to a driving wheel. A power transmission path including a chain mechanism and a one-way clutch is provided between an oil pump and a turbine shaft that is part of the engine output system. Another power transmission path including a corresponding chain mechanism and a corresponding one-way clutch is provided between the oil pump and a primary shaft that is part of the power transmission system.

First claim

What is claimed is:

1. A drive apparatus for a vehicle provided with an engine output system that connects an engine and a clutch mechanism, and a power transmission system that connects the clutch mechanism and a driving wheel, the drive apparatus comprising:
an oil pump that supplies a hydraulic oil to a transmission mechanism of the power transmission system;
a first power transmission path that is provided between the engine output system and a first end side of the oil pump, the first power transmission path connecting the engine output system to the first end side of the oil pump in a first gear ratio;
a first one-way clutch that is provided in the first power transmission path, the first one-way clutch transmitting a power from the engine output system to the oil pump while cutting off the power from the oil pump to the engine output system;
a second power transmission path that is provided between the power transmission system and a second end side of the oil pump, the second power transmission path connecting the power transmission system to the second end side of the oil pump in a second gear ratio;
a second one-way clutch that is provided in the second power transmission path, the second one-way clutch transmitting the power from the power transmission system to the oil pump while cutting off the power from the oil pump to the power transmission system,
wherein the power is transmitted to the oil pump through the first power transmission path or the second power transmission path,
wherein the second power transmission path is provided between an input side of the power transmission system and the oil pump,
wherein the first gear ratio of the first power transmission path is set to be less than the second gear ratio of the second power transmission path,
wherein, when the clutch mechanism is engaged, the power is transmitted to the oil pump through the first power transmission path from the engine, and
wherein the clutch mechanism is located between the first power transmission path and the second power transmission path such that the clutch mechanism is configured to synchronize a rotational speed of a turbine shaft that transfers the power from the engine output system to the first power transmission path with a rotational speed of a primary shaft that transfers the power from the power transmission system to the second power transmission path;

a first drive shaft connected between the first one-way clutch and the first end side of the oil pump;
a second drive shaft connected between the second one-way clutch and the second end side of the oil pump,
wherein the first power transmission path is connected to the first drive shaft via the first one-way clutch and the second power transmission path is connected to the second drive shaft via the second one-way clutch, a direction of an extension of the first drive shaft and a direction of an extension of the second drive shaft falling on a same line such that the first drive shaft and the second drive shaft are rotated as a single shaft, and
wherein the engine output system comprises a torque converter connected to the engine via a crank shaft;

a motor generator connected to an end of the primary shaft;
a first drive sprocket of the first power transmission path drivingly connected to the turbine shaft;
a second drive sprocket of the second power transmission path drivingly connected to the primary shaft;
a primary pulley provided on the primary shaft between the second drive sprocket and the motor generator; and
a forward/backward switching mechanism provided between the first drive sprocket and the second drive sprocket,
wherein the turbine shaft extends collinearly with the primary shaft such that the torque converter, the first drive sprocket, the forward/backward switching mechanism, the second drive sprocket, and the primary pulley are sequentially arranged between the engine and motor generator along a direction of an extension of the turbine shaft and the primary shaft.

2. The drive apparatus for a vehicle according to claim 1 , wherein a torque carrying capability of the second power transmission path is set to be less than a torque carrying capability of the first power transmission path.

3. The drive apparatus for a vehicle according to claim 1 , wherein each of the first and second power transmission paths includes a gear mechanism or a chain mechanism.

4. The drive apparatus for a vehicle according to claim 1 , wherein the motor generator is incorporated into the power transmission system.

5. The drive apparatus for a vehicle according to claim 1 , wherein the first end side of the oil pump and the second end side of the oil pump are located on opposing sides of the oil pump.

6. The drive apparatus for a vehicle according to claim 1 , wherein the oil pump comprises a rotor, the first end side of the oil pump and the second end side of the oil pump being located on opposing sides of the rotor.

7. The drive apparatus for a vehicle according to claim 1 , wherein the second power transmission path is provided between the power transmission system and the second end side of the oil pump independent of the first power transmission path that is provided between the engine output system and the first end side of the oil pump.

8. The drive apparatus for a vehicle according to claim 1 , wherein the power transmission system includes:
a primary oil chamber located on a rear side of the primary pulley;
a secondary shaft parallel to the primary shaft and provided with a secondary pulley, a secondary oil chamber being located on a rear side of the secondary pulley; and
a driving chain trained around the primary pulley and the secondary pulley for connecting the primary shaft to the secondary shaft.

9. The drive apparatus for a vehicle according to claim 8 , wherein the power is transmitted to the oil pump through the first power transmission path or the second power transmission path depending on rotational speeds of the turbine shaft and the primary shaft.

10. The drive apparatus for a vehicle according to claim 9 , wherein the turbine shaft is parallel to the secondary shaft.

11. The drive apparatus for a vehicle according to claim 10 , wherein the first end side of the oil pump and the second end side of the oil pump define opposing surfaces of a rotor of the oil pump.

12. The drive apparatus for a vehicle according to claim 11 , wherein the first drive shaft and the second drive shaft are parallel to the primary shaft and the turbine shaft.

13. The drive apparatus for a vehicle according to claim 9 , further comprising:
a first driven sprocket connected between the first one-way clutch and the turbine shaft; and
a second driven sprocket connected between the second one-way clutch and the primary shaft.

14. The drive apparatus for a vehicle according to claim 13 , wherein, when the rotation speed of the first driven sprocket driven by the turbine shaft is more than the rotation speed of the second driven sprocket driven by the primary shaft, the second one-way clutch is released and the first one-way clutch is engaged to transmit the power from the first power transmission path to the oil pump.

15. The drive apparatus for a vehicle according to claim 14 , wherein, when the rotation speed of the first driven sprocket is less than the rotation speed of the second driven sprocket, the first one-way clutch is released and the second one-way clutch is engaged to transmit the power from the second power transmission path to the oil pump.

16. The drive apparatus for a vehicle according to claim 1 , wherein the power tra

Assignees

• Hirose Takashi
• Sato Keiji
• Maruyama Keiichi
• Oki Shogo
• Inoue Satoshi
• Fuji Heavy Ind Ltd

Inventors

• Hirose Takashi
• Sato Keiji
• Maruyama Keiichi
• Oki Shogo
• Inoue Satoshi

Classifications

• F16H61/0028

  using a single pump driven by different power sources · CPC title

• B60K6/543

  the transmission being a continuously variable transmission · CPC title

• Y02T10/6221

  Cross-Sectional Technologies · mapped topic

• B60K6/48 Primary

  Parallel type · CPC title

• Y02T10/62

  Hybrid vehicles · CPC title