Oil pump, more particularly for a chain saw

Pumps – Expansible chamber type – Pumping member position controlled port

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Details

F04B 706

Patent

active

054113822

ABSTRACT:
The claimed invention is an oil pump (18), more particularly for a chain saw (100). The oil pump has a cylindrical pump chamber (20) constructed in a pump housing (19). The pump housing has an intake slot (21) and an outlet slot (23). A pump piston (25) is slidably and rotatably mounted in the pump chamber (20), and is rotatable by means of a gearing (30). The pump piston has a sloping terminal surface (35) that wobbles when the pump piston (25) rotates. The surface area (35) is springably supported against a stop (36). The stop (36), which is located on a rotating element (40), is disposed in the direction of a central longitudinal axis (L) of the pump piston (25) at a fixed distance (R) from the central longitudinal axis (L). The distance (R) predetermines the pump stroke. The angular position of the stop (36) is adjustable by rotating the rotating element (40) about its axis of rotation, thereby causing a phase shift in which the degree of overlap in the opening of the inlet slot and outlet slot change. This makes possible an accurately defined adjustment in pump flow volume, so that the minimum and maximum oil flow rate can be readily defined. This regulating means is simple in its construction, uses but a few component parts, and can be simply altered with regard to the oil volume to be delivered so as to adapt the oil pump to different chain saw types.

REFERENCES:
patent: 3285192 (1966-11-01), Gutkowski
patent: 3938622 (1976-02-01), Densow
patent: 4034830 (1977-07-01), Makai et al.
patent: 4043711 (1977-08-01), Seino
patent: 4231716 (1980-11-01), Kubota
patent: 4465440 (1984-08-01), Thomsen et al.
patent: 4797073 (1989-01-01), Kubota
patent: 4801253 (1989-01-01), Johansson
patent: 5236314 (1993-08-01), Nagashima

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