Hydraulic braking system for an automotive vehicle

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 hydraulic fluid;
• a master cylinder having a housing defining therein a bore, a master piston slidably disposed in said bore to form a pressure chamber for introducing said hydraulic fluid thereinto from said reservoir and generating a hydraulic braking pressure in response o depression of a brake pedal;
• a regulator having a housing defining therein a regulator chamber for introducing said hydraulic power pressure thereinto from said power source and regulating said hydraulic power pressure into a regulated hydraulic pressure in response to said hydraulic braking pressure generated in said master cylinder, said housing of said regulator being integral with said housing of said master cylinder in substantially coaxial relationship therewith;
• a control piston slidably disposed between said regulator chamber of said regulator and said pressure chamber of said master cylinder, said control piston being applied at one end thereof with a hydraulic pressure in said regulator chamber and at the other end thereof with said hydraulic braking pressure in said master cylinder, so that said control piston disconnects the fluid communication between said regulator and said master cylinder;
• 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 communicated with said pressure chamber of said master cylinder and a second group of wheel brake cylinders communicated with said regulator chamber, and
• said regulator comprising a housing defining therein a bore coaxial with said pressure chamber of said master cylinder, in which said control piston is axially slidably disposed to form a regulator chamber, and valve means disposed within said regulator chamber for controlling the communication of said regulator chamber with said power source and said reservoir in response to movement of said control piston, said valve means normally allowing a flow of said hydraulic fluid from said reservoir into said regulator chamber and said valve means inhibiting the flow of said hydraulic fluid from said reservoir and introducing said hydraulic power pressure into said regulator chamber when said hydraulic braking pressure in said master cylinder exceeds said hydraulic pressure in said regulator chamber.

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 hydraulic fluid;
• a master cylinder having a housing defining therein a bore, a master piston slidably disposed in said bore to form a pressure chamber for introducing said hydraulic fluid thereinto from said reservoir and generating a hydraulic braking pressure in response to depression of a brake pedal;
• a regulator having a housing defining therein a regulator chamber for introducing said hydraulic power pressure thereinto from said power source and regulating said hydraulic power pressure into a regulated hydraulic pressure in response to said hydraulic braking pressure generated in said master cylinder, said regulator being positioned in substantially coaxial relationship with said master cylinder and responsive mechanically to depression of said brake pedal;
• a plurality of wheel brake cylinders for having respective road wheels, said wheel brake cylinders being divided into a first group of wheel brake cylinders communicated with said pressure chamber of said master cylinder and a second group of wheel brake cylinders communicated with said regulator chamber;
• and
• a changeover valve selectively placed in one of a first operating position for communicating said first group of wheel brake cylinders with said pressure chamber and a second operating position for communicating said first group of wheel brake cylinders with said regulator chamber and blocking the communication between said first group of wheel brake cylinders and said pressure chamber.