Piston pump having a hardened piston with a wavy profile

Details Piston pump having a hardened piston with a wavy profile Piston pump having a hardened piston with a wavy profile

1997-10-10

1999-11-23

Freay, Charles G.

Pumps

Expansible chamber type

Valved piston

417549, 92159, 92172, F04B 3910

Patent

active

059889977

ABSTRACT:
A piston pump for delivering hydraulic fluid for ABS brake systems having at least one pump piston. The pump piston is driven to execute an axial stroke motion and which, with a sliding face embodied on its circumference, slides against the inner wall of a guide bore in order to assure a favorable sliding friction between the pump piston and the guide bore for the purpose of noise reduction and to achieve longer service lives for the seal. Viewed in the longitudinal section of the pump piston, the slide face is embodied as wavy, wherein wave crests and wave troughs follow one another in succession in the longitudinal direction of the pump piston.

REFERENCES:
patent: 2895773 (1959-07-01), McConnaughey
patent: 3792518 (1974-02-01), Cross et al.
patent: 4075934 (1978-02-01), Wacker et al.
patent: 5395219 (1995-03-01), Hosoya et al.
patent: 5628625 (1997-05-01), Dokas
Karl Schimidt GmbH, SCH. 5976/46c/ dated 2/27/51.

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