초록 ▼

A wheel cylinder is formed in the brake caliper for each wheel of a vehicle and brake fluid is supplied from a master cylinder to this wheel cylinder by way of a fluid passage. A brake piston is provided inside the wheel cylinder and includes a piezoelectric piston device inside. By the application

A wheel cylinder is formed in the brake caliper for each wheel of a vehicle and brake fluid is supplied from a master cylinder to this wheel cylinder by way of a fluid passage. A brake piston is provided inside the wheel cylinder and includes a piezoelectric piston device inside. By the application of voltage, this piezoelectric piston device expands and contracts the brake piston. A control valve is provided in the fluid passage to open and close it to selectively partition off the master cylinder. When the control valve has closed the passage, a voltage is applied to the piezoelectric piston device to expand it and control the pressure acting on the brake piston in the wheel cylinder to vary the braking force.

대표청구항 ▼

A vehicle braking control apparatus, comprising: a wheel cylinder, which is formed in a brake caliper and is provided for each wheel, and to which a fluid is supplied to exert a braking force; a brake piston movably provided in and coaxial with said wheel cylinder to exert a braking force on the whe

A vehicle braking control apparatus, comprising: a wheel cylinder, which is formed in a brake caliper and is provided for each wheel, and to which a fluid is supplied to exert a braking force; a brake piston movably provided in and coaxial with said wheel cylinder to exert a braking force on the wheel in response to the pressure of the fluid in said wheel cylinder; a control cylinder positioned coaxial with said brake piston; a piezoelectric piston device, which is provided in said control cylinder and includes a plurality of laminated thin-plate piezoelectric elements, and which is expanded and contracted by the supply of voltage; a hydraulic chamber, which is formed in said control cylinder by partitioning said control cylinder with said piezoelectric piston device, and the pressure which corresponds to the expansion and contraction of said piezoelectric piston device; a displacement amplifying mechanism, which amplifies the expansion and contraction of said piezoelectric piston device in response to changes in the fluid pressure in said hydraulic chamber generated by the expansion and contraction of said piezoelectric piston device; and a displacement member, which is driven by said displacement amplifying mechanism in response to changes in pressure in said hydraulic chamber to vary the braking force of said brake piston by the amount of movement of said displacement member.