A clutch connecting/disconnecting device comprises: a clutch pedal; a clutch cylinder; a depression force transmission mechanism; and an actuator. The depression force transmission mechanism is configured to include a cylinder device. The cylinder device includes an input piston, an output piston, a first oil chamber, and a second oil chamber. A pressure receiving area on the first oil chamber side of the output piston is male equal. to a pressure receiving area on the second oil chamber side of the output piston. The first oil chamber and the second oil chamber are connected via an electromagnetic valve connecting and disconnecting between the first oil chamber and the second oil chamber, and the actuator is connected to the output piston in a power transmitting manner.

A clutch-side transmission circuit transmits, from a clutch pedal, a restoring action of the depressed clutch pedal. A switching device connects a first clutch-side hydraulic circuit to the pedal-side hydraulic circuit when a shift lever SL is tilted forwards and connects a second clutch-side hydraulic circuit to the pedal-side hydraulic circuit when the shift lever SL is tilted rearwards. A first clutch is engaged in response to the restoring action of the clutch pedal being transmitted from the first clutch-side transmission circuit. A second clutch is engaged in response to the restoring action of the clutch pedal being transmitted from the second clutch-side transmission circuit.

A device for hydraulic control of a clutch for a motor vehicle, including a master cylinder controlled by a clutch pedal, a mechanism supplying the master cylinder with hydraulic fluid, a receiving cylinder for actuation of the clutch, the master cylinder linked to the receiver cylinder by a hydraulic pipe, the cylinder for actuation of the clutch being positioned in a rear of the vehicle and the pedal and the master cylinder being placed at a front of the vehicle, the hydraulic pipe linking the front and rear of the vehicle including a plurality of pipe offset devices along its length to encourage return of air bubbles to the mechanism supplying the master cylinder with hydraulic fluid.

A product that may include a clutch. A multi-chamber hydraulic unit may define a first chamber, a second chamber and a third chamber, each within the multi-chamber hydraulic unit. A first piston may separate the first chamber from the second chamber. The clutch may open in response to movement of the first piston. A second piston may separate the second chamber from the third chamber. A powered pump and a control valve may be provided wherein one of the second or third chambers may be in interruptible fluid communication with the powered pump through the control valve.

A system and method for actuation of a clutch in a transmission of a vehicle including an electronic clutch actuator adapted to be in fluid communication with a clutch slave cylinder coupled to the clutch of the transmission and the electronic clutch actuator including an integrated manual override assembly adapted to be in fluid communication between the clutch footpedal and the clutch slave cylinder, wherein the integrated manual override assembly prevents fluid flow from the clutch footpedal to the clutch slave cylinder when the electronic clutch actuator is being used to electronically actuate the clutch slave cylinder and allows fluid flow from the clutch footpedal to the clutch slave cylinder when the electronic clutch actuator is not being used to manually actuate the clutch slave cylinder.

An electronic clutch actuator for actuation of a clutch in a transmission of a vehicle includes a clutch master cylinder having a fluid cavity therein and adapted to be in fluid communication with a clutch slave cylinder coupled to the clutch of the transmission and a clutch footpedal of the vehicle, the clutch master cylinder having a first port fluidly communicating with the fluid cavity and adapted for fluid communication with the clutch slave cylinder, a second port fluidly communicating with the fluid cavity and adapted for fluid communication with the clutch footpedal, and a third port fluidly communicating with the fluid cavity and adapted for fluid communication with a fluid bypass, and a movable piston disposed in the fluid cavity of the clutch master cylinder to act as a switch valve to allow fluid flow from the second port to the third port when the electronic clutch actuator is being used and to allow fluid flow from the second port to the first port when the electronic clutch actuator is not being used.

An expansion chamber device for clutch pedal vibration attenuation includes a cylindrical body having an inlet line integrally connected to and penetrating through a first end wall of the body. At an opposite end of the body from the first end wall is a discharge line integrally connected to and penetrating a second end wall of the body. A diameter of the expansion chamber device is approximately 3.8 cm and a length of the expansion chamber device ranges between approximately 10.2 cm to 15.2 cm. The expansion chamber device reduces vehicle and engine vibrations in a path including a clutch pedal over a frequency range between approximately 50 Hz to approximately 225 Hz.

An expansion chamber device for clutch pedal vibration attenuation includes a cylindrical body having an inlet line integrally connected to and penetrating through a first end wall of the body. At an opposite end of the body from the first end wall is a discharge line integrally connected to and penetrating a second end wall of the body. A diameter of the expansion chamber device is approximately 3.8 cm and a length of the expansion chamber device ranges between approximately 10.2 cm to 15.2 cm. The expansion chamber device reduces vehicle and engine vibrations in a path including a clutch pedal over a frequency range between approximately 50 Hz to approximately 225 Hz.