Rotary expansible chamber devices – With changeable working chamber magnitude – Spring or fluid biased movable member
Patent
1994-09-13
1996-01-16
Freay, Charles
Rotary expansible chamber devices
With changeable working chamber magnitude
Spring or fluid biased movable member
418 27, 418 30, 417220, F01C 2116
Patent
active
054842719
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a National Phase application of PCT/DE 92/01059 filed 15 Dec. 1992 based, in turn, upon German National Application P 42 00 305.9 of 9 Jan. 1992, under the International Convention.
FIELD OF THE INVENTION
The invention relates to a vane pump comprising a casing, a controlling collar guided leaktightly in the casing and movable relative to a rotor mounted in the casing and surrounded by the controlling collar, the movement being transverse to the axial direction of the rotor, wherein a suction region of the pump is defined by a volume, increasing in the direction of rotation of the rotor, of a vane cell formed between two adjacent vanes, the rotor and the controlling collar, and a pressure region is defined by a volume, decreasing in the direction of rotation, of the vane cell, and wherein at least one adjustment member is provided to adjust the position of the controlling collar in dependence on the prevailing pumping parameters.
The pumping parameters, which influence the position of the controlling collar, can include the delivery volume of the pump, and the pressure at the pressure side.
BACKGROUND OF THE INVENTION
One such vane pump is known from U.S. Pat. No. 2,318,292.
German Offenlegungsschrift No. 40 11 671 also describes a vane pump which has substantially the above mentioned features, but the arrangement and position of possible adjustment members is not described. Apart from the special arrangement of adjustment members and corresponding design of the controlling collar, the vane pump described in DE 40 11 671 Al is identical with the vane pump described in the present application so that that application, which originates from the same inventor, may be referred to as regards further design features and properties associated therewith.
The adjustment members require a large space as is shown by the nearest prior art represented by the above mentioned U.S. Pat. No. 2,318,292. Because such vane pumps are regularly used as auxiliary units for other machines, particularly as lubricating pumps in engines and other machines, the utilization of additional space is undesired and often associated with considerable drawbacks. In addition, also the weight of the pump is thereby increased which is also undesirable. Finally, the control ducts for the adjustment member or members require additional holes or passages in the casing to enable the mentioned pumping parameters to act on the adjustment members which, in turn, change the position of the controlling collar and thereby the parameter of the pump to a desired value.
OBJECT OF THE INVENTION
The object of the present invention is to provide a vane pump with the initially mentioned features which has a space-saving and/or simple and cost-saving construction.
SUMMARY OF THE INVENTION
The object is achieved, in accordance with the invention in that at least one recess, open towards the outside of the controlling collar and in the controlling direction, is provided on the controlling collar close to its pressure region to accommodate an adjustment member.
The adjustment member can therefore be integrated into the controlling collar itself or the recess provided thereon, and needs no additional space, or only small additional space in the casing outside the controlling collar.
A double-walled design of the controlling collar on the pressure side of the controlling collar leads to the provision of an additional pressure chamber between the two walls forming the double wall, which is situated radially outside the region (pressure space) swept by the rotor vanes, while radial openings in the wall facing the vane cells establish communication between the pressure space and the pressure chamber. The pressure space is thereby emptied more easily and faster, so that, even if the rotor rotates at a very high speed, no excessively high pressure builds up and hard pressure shocks are avoided.
A disadvantage of this embodiment with a double-walled controlling collar and an additional pressure chambe
REFERENCES:
patent: 2142275 (1939-01-01), Lane
patent: 2309148 (1943-01-01), Wilson et al.
patent: 2318292 (1943-05-01), Chandler
patent: 2894458 (1959-07-01), Hallman
patent: 4538974 (1985-09-01), Stich et al.
Dubno Herbert
Freay Charles
Mercedes-Benz Aktiengesellschaft
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