Brake force regulator for a motorcycle hydraulic brake system
AssigneeITT Industries, Inc.
InventorVolker Berisch
Life of this patent
Estimating the term…
Abstract
In a known motorcycle brake system, the pedal master cylinder acts on the front-wheel brakes, and the hand master cylinder acts only on the front-wheel brake. The brake force regulator's control behavior is influenced by the hand master cylinder. Known regulators have operational disadvantages and require a relatively high hand master cylinder pressure for shifting the stepped piston back to its rest position. Also, this pressure must be transmitted by the valve seat. These disadvantages are eliminated by the brake force regulator of the present invention which includes a pressure piston actuated by the pressure of the hand master cylinder and is in permanent interaction with the end surface of the smaller step of the stepped piston.
Claims9
A brake force regulator for a motorcycle hydraulic brake system having a rear-wheel brake and a first front-wheel brake actuated by pressure from a pedal master cylinder, and a second front-wheel brake actuated by pressure from a hand master cylinder, said brake force regulator controlling the pressure supplied to said rear-wheel brake dependent on the pressure produced by said hand master cylinder during the time when said pedal master cylinder and said hand master cylinder are simultaneously actuated, said brake force regulator comprising:
- a control piston including
- a stepped piston portion disposed in and coaxial of a longitudinal axis of a housing axially slidable against the force of a control spring, said stepped piston portion having a first effective area exposed to the pressure from said pedal master cylinder and a second effective area exposed to the pressure in said rear-wheel brake, and
- a pressure piston portion disposed in said housing coaxial of said axis in tandem relationship with said stepped piston portion, said pressure piston portion having one end surface thereof in permanent association with the end surface of the smaller step of said stepped piston portion and the other end surface receiving pressure supplied by said hand master cylinder;
- and
- a valve disposed in a bore of said stepped piston portion coaxial of said axis, said valve being closed upon displacement of said stepped piston portion and said pressure piston portion against the force of said control spring to interrupt a fluid connection through said bore from said pedal master cylinder to said rear-wheel brake.
Dependencies are inferred from the claim text.