Pumps – With condition responsive pumped fluid control – Fluid flow rate responsive
Patent
1997-04-17
1998-09-01
Thorpe, Timothy
Pumps
With condition responsive pumped fluid control
Fluid flow rate responsive
417308, 417310, F04B 4900
Patent
active
058001352
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a vane cell pump with a cam ring seated in a housing and a rotor with radial slits, which can be driven by means of an input driveshaft. Work slides have been inserted into the radial slits, which sealingly slide along the cam ring. Work chambers are formed between the cam ring, the rotor and the work slides which are delimited in the axial direction by control plates. A flow control valve, which on the one side is fed by the conveying pressure and on the other by the outlet pressure plus a spring force, has been installed in the housing and can provide a connection from a pressure chamber to a spray channel connected with the suction side. In addition, a suction channel is divided into two symmetrically arranged curved suction arms located in the front wall of a housing, leading to suction zones.
2. Description of the Prior Art
A vane cell pump of this type is known, for example, from U.S. Pat. No. 5,112,199. This pump has two spray channels, which branch off the flow control valve and are connected with the two suction zones. In addition, the suction zones are also connected via two grooves with an inlet bore located below the flow control valve. Such a system with two spray conduits is comparatively expensive. It is furthermore possible that because of tolerances these conduits are activated in different ways when spraying the oil. This means that one of the two suction zones is fed only after a delay. Noise can be generated by the difference in filling of the suction zones.
Therefore the invention is based on the object of improving the pump in its spray and suction areas in such a way that an advantageous noise behavior results even at high pump rpm, along with small manufacturing costs.
SUMMARY OF THE INVENTION
This object is attained by the vane cell pump of the present invention in that the suction conduit terminates in a distributing section, which is located in the center in respect to the flow control valve and from which the curved suction arms radiate, wherein the distributing section and the curved suction arms are arranged in such a way that the input driveshaft or its friction bearing bush act as flow divider. In this case the spray conduit of the flow control valve terminates in the center of the distributing section.
In accordance with the preferred embodiment, the contour of the input driveshaft constitutes the inner channel wall in the distributing section and over a part of the length of the suction arms. The oil diverted in a directed manner at the flow control valve via the spray channel into the distributing section impacts on the input driveshaft and flows on both sides of the shaft without any great resistance over the curved suction arms into the suction zones. Since only one spray conduit is located in the center of the distributing section, the oil can be evenly distributed over the suction zones. The input acting as a flow divider has yet another advantage: since the oil, which is diverted in a directed manner at high speed at the flow control valve, impacts on the input driveshaft of hard steel, no cavitation or abrasion can take place at this location. In case of making the channel walls of diecast metal, of which, as a rule, the entire housing consists, such wear in the sensitive distributing area could not be ruled out.
Practical and advantageous embodiments of the invention are described herein. However, the invention is not limited to the combination of characteristics of the invention. For one skilled in the art, further useful possibilities of combining concepts and features of the invention ensue from the definition of the object.
In an alternative embodiment in accordance with the present invention, a friction bearing bush of the input driveshaft is embodied as a flow divider, wherein the slide bearing bushing extends approximately to the inner control plate. Because the friction bearing bush is designed as a two-component bearing, the diverted stream of the spray bore again impacts on
REFERENCES:
patent: 2981067 (1961-04-01), Clark et al.
patent: 5236315 (1993-08-01), Hamao et al.
Thorpe Timothy
Tyler Cheryl J.
ZF Friedrichshafen AG.
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