Brake system pump with a damper chamber with leaf spring and cup closure
AssigneeRobert Bosch GmbH
InventorsUrsula Eckstein, Martin Eggenmueller, Wolfgang Schuller, Rolf Hummel
Life of this patent
Estimating the term…
Abstract
The object is to shorten the installation length of the pump. The high-pressure pump has a pump housing with a bore, in which a pump element having a cylinder, a piston longitudinally movable therein and an outlet valve is received. The cylinder is screwed into the bore and axially fixed at a bore step. The outlet valve has a ball, received in a hollow-cylindrical extension of the cylinder and loaded on its end remote from the valve seat by a leaf spring secured to the cylinder. The hydraulic high-pressure pump is usable in particular in motor vehicle brake systems having an anti-lock and possibly traction control system.
Claims3
A hydraulic high-pressure pump (10) for motor vehicle brake systems having an anti-lock and traction control system, comprising at least one pump element (13), a cylinder (14) and a piston (15), longitudinally movable in said cylinder and defining a positive displacement chamber (32), and an outlet valve (17),
- the cylinder (14) is received in a bore (12) of a pump housing (11) and is axially fixed on a bore step (23),
- the cylinder (14) is screw-threaded into the bore (12) of the pump housing (11) and has a collar (21) provided with an external thread, which collar is provided on a free face end (24) remote from the bore step (23) with recesses for engagement of a screwdriving tool,
- on an outlet side of the positive displacement chamber (32), the cylinder (14) has a valve seat (51), which is engaged by a spring-loaded ball (50) as a closing element of the outlet valve (17),
- the ball (50) of the outlet valve (17) is guided in a coaxial hollow-cylindrical extension (49) of the cylinder (14) and the hollow-cylindrical extension (49) of the cylinder (14) has on an end face an annular disk-shaped body (55) from which at least two evenly distributed and at least approximately radially extending leaf spring tongues (57) extend, and from which at least three evenly distributed at least approximately axially oriented spring clasps (54) are at an outer circumference of the annular disk-shaped body (55) and engage a circumferential groove (53) of the hollow-cylindrical extension (49).
Dependencies are inferred from the claim text.