Motor vehicle master cylinder with device for detecting actuation of a braking system
AssigneeRobert Bosch GmbH
InventorsOlivier Masson, Jean Fourcade
Life of this patent
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Abstract
The invention proposes a master cylinder 1 with a device for detecting actuation of a braking system. The detection device is fixed to a body 2 of the master cylinder 1 at a pressure chamber 5. The detection device comprises a magnetic circuit 9 able to be opened and closed by a moving magnetic piece 19. The moving magnetic piece 19 is, for example, fixed to a piston 4 of the master cylinder 1. Actuation of a brake pedal causes the piston 4 and the moving piece 19 to advance in the master cylinder 1. The magnetic circuit 9 therefore changes state (opened or closed). The change in state of the magnetic field switches the brake lights on and off.
Claims13
A Master cylinder for a motor vehicle braking system, comprising
- a master cylinder (1) body (2) made of non-magnetic material,
- a bore (3) formed in the body of the master cylinder,
- a variable-volume pressure chamber (5) inside the bore,
- a piston (4) sliding in the bore and varying the volume of the pressure chamber,
- a detection device (9) detecting actuation of the braking system, fixed to the body of the master cylinder, facing a passage of the piston, the detection device being equipped with at least one magnetic circuit (9) that can be opened or closed by a magnetic piece (19), characterized in that the magnetic circuit comprises at least two pole pieces (10, 11), a magnet (12) and a magnetically sensitive element (13).
Dependencies are inferred from the claim text.