A clutch engagement booster system is an apparatus used to support and improve clutch engagement on motor vehicles, both as a modification to existing clutch assemblies or as a standalone installation in various embodiments. The clutch engagement booster system utilizes a casing and pressure housing supporting a diaphragm, an expansion chamber, an engagement member, and at least one clutch element. The expansion chamber is formed between the diaphragm and the pressure housing in fluid communication with at least one pressure source through the at least one regulator device. The at least one clutch element is positioned within the casing, opposite the diaphragm across the engagement member. As the expansion chamber is pressurized the diaphragm deforms towards the engagement member, thereby forcing the at least one clutch element into engagement to transfer power through a host transmission.

A clutch engagement booster system is an apparatus used to support and improve clutch engagement on motor vehicles, both as a modification to existing clutch assemblies or as a standalone installation in various embodiments. The clutch engagement booster system utilizes a casing and pressure housing supporting a diaphragm, an expansion chamber, an engagement member, and at least one clutch element. The expansion chamber is formed between the diaphragm and the pressure housing in fluid communication with at least one pressure source through the at least one regulator device. The at least one clutch element is positioned within the casing, opposite the diaphragm across the engagement member. As the expansion chamber is pressurized the diaphragm deforms towards the engagement member, thereby forcing the at least one clutch element into engagement to transfer power through a host transmission.

A clutch control method for a vehicle includes: increasing, by a controller, a clutch torque to a refill execution torque at a predetermined first inclination when a predetermined first reference time period has elapsed in a micro-slip state of a clutch; increasing, by the controller, the clutch torque to a refill torque at a predetermined second inclination to initiate refilling of a pressure chamber of a hydraulic-driving actuator with oil in a reservoir tank when the clutch torque reaches the refill execution torque; and maintaining the clutch torque at the refill torque during a predetermined second reference time period.

Braking systems and methods having above atmospheric pressure applied to the working hydraulic fluid of the braking system. In certain preferred arrangements, the braking system includes at least one source of pressure, which pressurizes a fluid. The pressurized fluid acts on respective pressure surfaces of the master plunger(s) and the slave piston(s) that are opposite the active or working surfaces of the master plunger(s) and the slave piston(s).

Braking systems and methods having above atmospheric pressure applied to the working hydraulic fluid of the braking system. In certain preferred arrangements, the braking system includes at least one source of pressure, which pressurizes a fluid. The pressurized fluid acts on respective pressure surfaces of the master plunger(s) and the slave piston(s) that are opposite the active or working surfaces of the master plunger(s) and the slave piston(s).

A clutch actuating device has an actuating cylinder with piston and rod-side chamber, a multiplier cylinder with piston-side and rod-side chambers separated by a piston, a rod(s) interconnecting the pistons, and a directional control valve. The valve has a pilot port, ports in fluid connection with piston-side and rod-side chambers of the multiplier cylinder, and a port in fluid connection with a secondary source. When a first fluid pressure (P1) from a first pressure source is applied to the pilot port and rod-side chamber of the actuating cylinder, a second fluid pressure (P2) is applied to the piston-side chamber of the multiplier cylinder by the secondary source. This results in the first and second fluid pressures (P1 and P2) acting on the piston of the actuating cylinder to produce a clutch actuation fluid pressure.

A drive device for a PTO shaft includes a parking switch to detect a parking state of a vehicle body, a permission switch constituted of a self-returning switch and connected to the parking switch, the permission switch being configured to be switched to permit driving a PTO shaft, the PTO shaft being configured to be driven by a power of a prime mover disposed on the vehicle body, and a first switch device to be switched to enable the PTO shaft to be driven when the permission switch is switched to permit driving the PTO shaft under a state where the parking switch detects the parking state of the vehicle body.

A drive device for a PTO shaft includes a parking switch to detect a parking state of a vehicle body, a permission switch constituted of a self-returning switch and connected to the parking switch, the permission switch being configured to be switched to permit driving a PTO shaft, the PTO shaft being configured to be driven by a power of a prime mover disposed on the vehicle body, and a first switch device to be switched to enable the PTO shaft to be driven when the permission switch is switched to permit driving the PTO shaft under a state where the parking switch detects the parking state of the vehicle body.

A drive device for a PTO shaft includes a parking switch to detect a parking state of a vehicle body, a permission switch constituted of a self-returning switch and connected to the parking switch, the permission switch being configured to be switched to permit driving a PTO shaft, the PTO shaft being configured to be driven by a power of a prime mover disposed on the vehicle body, and a first switch device to be switched to enable the PTO shaft to be driven when the permission switch is switched to permit driving the PTO shaft under a state where the parking switch detects the parking state of the vehicle body.

An electric booster may include: a motor part configured to be driven by power applied thereto; a body part mounted and fixed onto the motor part; a cylinder part coupled to the body part; a screw part connected to the motor part and rotated; a nut part embedded in the body part, and screwed to the screw part so as to linearly move; a first piston part constraining an end of the screw part, and moved to the cylinder part while being pressed by the nut part; a first elastic part supporting the first piston part; a second piston part supported by the first elastic part; and a second elastic part supporting the second piston part.