초록 ▼

A hydraulic braking system for an automotive vehicle having a power source for generating a hydraulic power pressure, a reservoir, a master cylinder, a hydraulic booster for actuating the master cylinder in response to depression of a brake pedal and a plurality of wheel brake cylinders for braking

A hydraulic braking system for an automotive vehicle having a power source for generating a hydraulic power pressure, a reservoir, a master cylinder, a hydraulic booster for actuating the master cylinder in response to depression of a brake pedal and a plurality of wheel brake cylinders for braking respective road wheels, which are divided into a first group of wheel brake cylinders communicating with the master cylinder and a second group of wheel brake cylinders communicating with the hydraulic booster. An auxiliary cylinder is disposed between the hydraulic booster and the second group of wheel brake cylinders. The auxiliary cylinder includes a cylinder body having a cylinder bore defined therein and a piston axially slidably disposed within the cylinder bore. The piston forms within the cylinder bore a first chamber and a second chamber, and blocks a fluid communication therebetween. The first chamber communicates with the hydraulic booster and the second chamber communicates with the second group of wheel brake cylinders to which a braking force is applied in response to operation of the hydraulic booster. Thereby, the brake fluid filled in the hydraulic booster is prevented from flowing out, even if leakage of the brake fluid occurs in the second group of wheel brake cylinders.

대표청구항 ▼

A hydraulic braking system for an automotive vehicle comprising: a power source for generating a hydraulic power pressure; a reservoir for storing an amount of brake fluid; a master cylinder for introducing said brake fluid thereinto from said reservoir and generating a hydraulic braking pressure in

A hydraulic braking system for an automotive vehicle comprising: a power source for generating a hydraulic power pressure; a reservoir for storing an amount of brake fluid; a master cylinder for introducing said brake fluid thereinto from said reservoir and generating a hydraulic braking pressure in response to operation of a manually-operated member; a hydraulic booster for actuating said master cylinder by said hydraulic power pressure supplied from said power source in response to operation of said manually-operated member; a plurality of wheel brake cylinders for braking respective road wheels, said wheel brake cylinders being divided into a first group of wheel brake cylinders communicating with said master cylinder through a first hydraulic circuit and a second group of wheel brake cylinders communicating with said hydraulic booster through a second hydraulic circuit; and an auxiliary cylinder disposed in said second hydraulic circuit, said auxiliary cylinder comprising a cylinder body having a cylinder bore defined therein and a piston axially slidably disposed within said cylinder bore, said piston dividing said cylinder bore into a first chamber communicating with said hydraulic booster and a second chamber communicating with said second group of wheel brake cylinders, and said piston blocking a fluid communication between said first chamber and said second chamber, wherein said piston of said auxiliary cylinder forms within said cylinder bore a third chamber communicating with said reservoir through a drain circuit, and wherein said piston is equipped with a valve mechanism for normally communicating with second chamber with said third chamber, and blocking the communication therebetween when a hydraulic pressure supplied from said hydraulic booster to said first chamber exceeds a hydraulic pressure in said second chamber.