Vehicle power transmission system

Patent metadata

Field	Value
Publication number	US-9546697-B2
Application number	US-201615137738-A
Country	US
Kind code	B2
Filing date	Apr 25, 2016
Priority date	May 12, 2015
Publication date	Jan 17, 2017
Grant date	Jan 17, 2017

Abstract

A vehicle power transmission system includes a clutch having a friction plate, a clutch plate, and a pressure plate for elastically pressing the friction plate or the clutch plate by a pressure elastic body, a clutch actuator that applies a clutch OFF pressing force to the pressure plate, and a control device. When causing the clutch to shift to a clutch ON state, the control device controls operation of the clutch actuator to make the clutch OFF pressing force less than an elastic force of the pressure elastic body and apply an anti-assist force to the pressure plate.

First claim

What is claimed is:

1. A vehicle power transmission system comprising:
a transmission for transmitting a driving force of an engine mounted in a vehicle to a drive wheel of the vehicle while changing a rotational speed;
a clutch for transmitting or shutting off the driving force transmitted from the engine to or from the transmission, the clutch including: a clutch hub for holding a clutch plate placed facing a friction plate to be rotationally driven by the driving force transmitted from the engine and for transmitting the driving force to the transmission; and a pressure plate placed adjacently to the clutch hub so as to be approachable to and separable from and relatively rotatable with respect to the clutch hub, the pressure plate elastically pressing the friction plate or the clutch plate by a pressure elastic body;
a hub-side assist cam portion and a pressure-side assist cam portion included in the clutch hub and the pressure plate of the clutch respectively, the hub-side assist cam portion and the pressure-side assist cam portion each including an inclined surface for generating an assist force to increase a pressing force between the friction plate and the clutch plate upon generation of a relative rotation between the clutch hub and the pressure plate when the clutch shifts to a state where the driving force is transmitted;
a clutch actuator for applying, to the pressure plate, a clutch OFF pressing force to separate the pressure plate from the friction plate or the clutch plate against an elastic force of the pressure elastic body in order to put the clutch in a state where the driving force is shut off; and
a control device for controlling operation of the clutch actuator and controlling the transmission and shutting off of the driving force in the clutch, the control device, when the clutch is caused to shift to the state where the driving force is transmitted, controlling the operation of the clutch actuator to make the clutch OFF pressing force to be applied to the pressure plate less than the elastic force of the pressure elastic body and apply, to the pressure plate, an anti-assist force being less than the assist force against the assist force, in order to suppress the increase of the assist force.

2. The vehicle power transmission system according to claim 1 , wherein
the control device controls the operation of the clutch actuator and applies the anti-assist force to the pressure plate before the clutch enters a half clutch state.

3. The vehicle power transmission system according to claim 1 , wherein
the control device controls the operation of the clutch actuator and applies, to the pressure plate, the anti-assist force oriented toward the assist force after the assist force is generated and before the assist force reaches its maximum value.

4. The vehicle power transmission system according to claim 2 , wherein
the control device controls the operation of the clutch actuator and applies, to the pressure plate, the anti-assist force oriented toward the assist force after the assist force is generated and before the assist force reaches its maximum value.

5. The vehicle power transmission system according to claim 3 , wherein
the control device controls the operation of the clutch actuator and applies the anti-assist force to the pressure plate at a midpoint between after the assist force is generated and before the assist force reaches its maximum value.

6. The vehicle power transmission system according to claim 4 , wherein
the control device controls the operation of the clutch actuator and applies the anti-assist force to the pressure plate at a midpoint between after the assist force is generated and before the assist force reaches its maximum value.

7. The vehicle power transmission system according to claim 1 , wherein
the control device controls the operation of the clutch actuator and increases the anti-assist force applied to the pressure plate over time.

8. The vehicle power transmission system according to claim 1 , wherein
the control device controls the operation of the clutch actuator and continues applying the anti-assist force to the pressure plate until the clutch shifts to a clutch ON state where the driving force is fully transmitted to the transmission.

Assignees

• Fcc Kk

Inventors

• Chiba Ryohei
• Makita Shouji
• Iida Kaoru
• Sato Makoto
• Miyachi Kazuyoshi

Classifications

• F16D48/06

  Control by electric or electronic means, e.g. of fluid pressure · CPC title

• F16H2063/3093

  Final output elements, i.e. the final elements to establish gear ratio, e.g. coupling sleeves or other means establishing coupling to shaft · CPC title

• F16D2500/3023

  Force · CPC title

• F16H63/30

  Constructional features of the final output mechanisms · CPC title

• F16H61/0204

  for gearshift control, e.g. control functions for performing shifting or generation of shift signal · CPC title