Clutch hydraulic system for vehicle

Patent metadata

Field	Value
Publication number	US-9869353-B2
Application number	US-201414896674-A
Country	US
Kind code	B2
Filing date	Jun 18, 2014
Priority date	Jul 2, 2013
Publication date	Jan 16, 2018
Grant date	Jan 16, 2018

Abstract

A vehicle clutch hydraulic system for a vehicle is provided with a mechanical oil pump, an electric oil pump, a forward clutch and a control valve unit. In the vehicle clutch hydraulic system, a main pump oil passage fluidly connects the mechanical oil pump to the control valve unit. A sub-pump oil passage fluidly connects the electric oil pump to a forward clutch oil passage into which an oil passage outlet opens at an inside location closer to a clutch rotational axis than a clutch oil chamber of the forward clutch.

First claim

The invention claimed is:

1. A vehicle clutch hydraulic system for a vehicle, comprising:
a mechanical oil pump configured to be actuated by a rotary drive shaft of a drive system;
an electric oil pump configured to be actuated by an electric motor independent of actuation of the mechanical oil pump;
a clutch configured to be disposed in the drive system, the clutch being operated by hydraulic pressure supplied from the mechanical oil pump and the electric oil pump as a hydraulic power source for the clutch;
a control valve unit configured to provide engagement oil pressure and lubricating oil pressure to the clutch based on a pump discharge pressure from the hydraulic power source;
a main pump oil passage fluidly connecting the mechanical oil pump to the control valve unit; and
a sub-pump oil passage fluidly connecting the electric oil pump to a clutch oil passage arranged to supply hydraulic oil to a clutch oil chamber of the clutch,
the clutch oil passage being formed inside an L-shaped plate member and including a first radial oil passage portion and an axial oil passage portion, the first radial oil passage portion extending in a radial direction of the clutch and being connected to the sub-pump oil passage, the axial oil passage portion extending toward the clutch in an axial direction of the clutch from a radially inward end of the first radial oil passage portion,
the clutch oil passage further including an oil passage outlet that opens at a radially inward location closer to a clutch rotational axis than the clutch oil chamber.

2. The vehicle clutch hydraulic system according to claim 1 , wherein
the sub-pump oil passage is fluidly connected to an output oil passage leading from the control valve unit, and the clutch oil passage is fluidly connected on a downstream side of a connection position of the sub-pump oil passage and the output oil passage.

3. The vehicle clutch hydraulic system according to claim 2 , wherein
the L-shaped plate member includes a radial plate portion disposed in a side position of the clutch, and an axial extension portion that enters an interior region of the clutch from a clutch rotational axis side end of the radial plate portion, the first radial oil passage portion being disposed in the radial plate portion and the axial oil passage portion being disposed in the axial extension portion.

4. The vehicle clutch hydraulic system according to claim 3 , further comprising
a clutch temperature sensor configured to detect a temperature of the clutch; and
a clutch cooling controller programmed to actuate the electric motor of the electric oil pump, upon the clutch temperature sensor detecting a temperature of the clutch is at a predetermined temperature or higher.

5. The vehicle clutch hydraulic system according to claim 2 , further comprising
a clutch temperature sensor configured to detect a temperature of the clutch; and
a clutch cooling controller programmed to actuate the electric motor of the electric oil pump, upon the clutch temperature sensor detecting a temperature of the clutch is at a predetermined temperature or higher.

6. The vehicle clutch hydraulic system according to claim 1 , wherein
the L-shaped plate member includes a radial plate portion disposed in a side position of the clutch, and an axial extension portion that enters an interior region of the clutch from a clutch rotational axis side end of the radial plate portion, the first radial oil passage portion being disposed in the radial plate portion and the axial oil passage portion being disposed in the axial extension portion.

7. The vehicle clutch hydraulic system according to claim 6 , wherein
the plate member is a fixing plate member that maintains a fixed state regardless of a rotation of the drive system.

8. The vehicle clutch hydraulic system according to claim 7 , further comprising
a clutch temperature sensor configured to detect a temperature of the clutch; and
a clutch cooling controller programmed to actuate the electric motor of the electric oil pump, upon the clutch temperature sensor detecting a temperature of the clutch is at a predetermined temperature or higher.

9. The vehicle clutch hydraulic system according to claim 6 , further comprising
a clutch temperature sensor configured to detect a temperature of the clutch; and
a clutch cooling controller programmed to actuate the electric motor of the electric oil pump, upon the clutch temperature sensor detecting a temperature of the clutch is at a predetermined temperature or higher.

10. A vehicle clutch hydraulic system for a vehicle, comprising:
a mechanical oil pump configured to be actuated by a rotary drive shaft of a drive system;
an electric oil pump configured to be actuated by an electric motor independent of actuation of the mechanical oil pump;
a clutch configured to be disposed in the drive system, the clutch being operated by hydraulic pressure supplied from the mechanical oil pump and the electric oil pump as a hydraulic power source for the clutch;
a control valve unit configured to provide engagement oil pressure and lubricating oil pressure to the clutch based on a pump discharge pressure from the hydraulic power source;
a main pump oil passage fluidly connecting the mechanical oil pump to the control valve unit; and
a sub-pump oil passage fluidly connecting the electric oil pump to a clutch oil passage having an oil passage outlet that opens at a radially inward location closer to a clutch rotational axis than a clutch oil chamber of the clutch, the clutch oil passage supplying hydraulic oil to the clutch oil chamber;
a clutch temperature sensor configured to detect a temperature of the clutch; and
a clutch cooling controller programmed to actuate the electric motor of the electric oil pump upon the clutch temperature sensor detecting a temperature of the clutch is at a predetermined temperature or higher.

Assignees

• Nissan Motor

Inventors

• Kuwahara Takashi
• Ishii Shigeru

Classifications

• F16D25/14

  Fluid pressure control · CPC title

• F16D25/123

  in view of cooling and lubrication · CPC title

• F16D2500/70448

  for regulating the amount of fluid flow · CPC title

• F16D2500/30404

  Clutch temperature · CPC title

• F16D2048/0245

  Electrically driven rotary pumps · CPC title