Aisin Seiki K.k.

Junichi Okuno

Michiharu Nishii

Genji Mizuno

A hydraulic braking system for an automotive vehicle having a power pressure source for generating a hydraulic power pressure, a master cylinder generating a hydraulic braking pressure in response to depression of a brake pedal, a dynamic hydraulic pressure generator for regulating the hydraulic power pressure in response to depression of the brake pedal and generating a regulated braking pressure, and a plurality of wheel brake cylinders for braking respective road wheels with one of the hydraulic braking pressure supplied from the master cylinder and the regulated braking pressure supplied from the dynamic hydraulic pressure generator. A power pressure changeover valve is provided and repeatedly changed over to be placed in one of a first operating position where a passage defining therein a closed space is communicated with a space under atmospheric pressure, and a second operating position where the passage is communicated with the power pressure source when the hydraulic power pressure exceeds a predetermined value, so that the hydraulic power pressure is reduced to a proper value.

Growing community of inventors

Kariya, Japan

Junichi Okuno