Interlock braking system for motorcycles

Claim 1

An interlock braking system for motorcycles, comprising: a brake pedal; a single master cylinder operably connected with said brake pedal; first and second brake means connected to said master cylinder for applying first and second braking forces to a front wheel and a rear wheel, respectively, according to braking pressures corresponding to an external force applied to said brake pedal; a pressure circuit connecting said master cylinder with said first and second brake means; a braking force distribution mechanism for changing said first and second braking forces of said first and second brake means at a predetermined ratio set therebetween; anti-lock means, operably connected with said first and second brake means, for changing said first and second braking forces of said first and second brake means according to the rotational speeds of said front and rear wheels to prevent said wheels from becoming locked; said master cylinder including a first piston member operably connected to said brake pedal, a first cylinder accommodating said first piston member therein, a second piston member operably connected to said brake pedal, a second cylinder accommodating said second piston member therein, a first oil chamber defined by said first piston member and said first cylinder for generating said braking pressures, and a second iol chamber defined by said second piston member and said second cylinder; said anti-lock means being provided with a control mechanism for changing said braking forces according to said rotational speeds of said front and rear wheels; said control mechanism including a first relatively low pressure source, a second relatively high pressure source, a normally open valve disposed between said first oil chamber and said first pressure source, and a normally closed valve disposed between said second oil chamber and said second pressure source; said control mechanism closing and opening said normally open valve and said normally closed valve according to said rotational speeds of said front and rear wheels, whereby locking of said wheels is prevented; and said braking force distribution mechanism being set at a predetermined proportion in which said first braking force applied to said front wheel is greater than said second braking force applied to said rear wheel.