US 4,421,359 AGranted

Vehicular anti-lock brake device

AssigneeHonda Giken Kogyo Kabushiki Kaisha

InventorsTsutomu Hayashi, Masaie Kato, Mitsuru Saito

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Abstract

An improved anti-lock brake device of simple and compact construction adapted for use with a motorcycle having front and rear master cylinders for actuating front and rear wheel brakes, respectively. The front master cylinder has a first brake chamber for producing a brake torque for a front road wheel and a first control chamber for controlling the brake torque so as to prevent locking of the front wheel. The rear master cylinder has a second brake chamber for producing a brake torque for a rear road wheel and a second control chamber for controlling the brake torque so as to prevent locking of the rear wheel. The control chambers are each in communication with a single common source of oil pressure through a first control valve and with an oil tank through a second control valve.

Claims16

Dependent claims

A vehicular anti-lock brake device comprising a first master cylinder including a cylinder body having a pair of serially aligned first and second cylinder bores divided by a partition;

an operating piston slidable in said first cylinder bore and defining therein a brake chamber for applying brake oil pressure to said operating piston to produce a brake torque for a front wheel of the vehicle;
a control piston slidable in said second cylinder bore and defining therein a control chamber for applying control oil pressure to said control piston;
a piston rod extending through said partition between said first and second cylinder bores and operably connecting said control piston to said brake piston for applying a retracting force to said brake piston to reduce the brake torque when operating oil is introduced into said control chamber to prevent locking of the front wheel;
and an oil tank having an interior partition of given height dividing the tank into a first oil reservoir for feeding operating oil to said brake chamber and a second oil reservoir;
a second master cylinder including a cylinder body, an operating piston, a control piston and an oil tank, said operating piston of said second master cylinder defining a second brake chamber for applying brake oil pressure to the operating piston of said second motor cylinder to produce brake torque for a rear wheel of the vehicle, said control piston of the second master cylinder defining a control chamber in said cylinder body of the second master cylinder for applying control oil pressure to said control piston to prevent locking of the rear wheel, said brake chambers of the first and second master cylinders being hydraulically disconnected from one another to form independent brake systems for the front and rear wheels, an auxiliary oil tank connected to the oil tanks of the first and second master cylinders, a hydraulic pump having an inlet and an outlet, said auxiliary oil tank being connected to the inlet of said hydraulic pump;
first and second normally open control valves and first and second normally closed control valves, said outlet of said hydraulic pump being connected through said normally closed first and second control valves respectively to said control chambers of said first and second master cylinders, said auxiliary oil tank being connected through said normally closed first and second control valves respectively to said control chambers of said first and second master cylinders.

3 more elements

An anti-lock brake device for a motorcycle having front and rear wheels with respective brakes and brake cylinders, said anti-lock brake device comprising a front master cylinder having a first brake chamber connected to a front wheel cylinder for producing a brake torque applied to the front wheel and first control chamber means for controlling the brake torque produced by said first brake chamber to prevent locking of said front wheel, a rear master cylinder having a second brake chamber connected to a rear wheel cylinder for producing a brake torque applied to the rear wheel and second control chamber means for controlling the brake torque produced by said second brake chamber to prevent locking of said rear wheel, said first and second brake chambers being hydraulically disconnected from each other to form a pair of independent brake systems for said front and rear wheels;

a single common source of oil pressure connected to said first control chamber means through a first normally closed control valve and to said second control chamber means through a second normally closed control valve, a first main oil tank on said front master cylinder in communication with said first brake chamber, a second main oil tank on said rear master cylinder in communication with said second brake chamber, an oil passage connecting said first and second main oil tanks, and an auxiliary oil tank disposed in said oil passage and connected to said first control chamber means through a first normally open control valve and to said second control chamber means through a second normally open control valve.

Dependencies are inferred from the claim text.