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Variable displacement pump with electric control of displacement regulation and method of regulating pump displacement

a variable displacement pump and electric control technology, applied in the direction of liquid fuel engines, machines/engines, rotary piston liquid engines, etc., can solve the problems of inability to modify the displacement presetting, high fuel consumption and a greater stress on the components, and high cost of electro-hydraulic systems

Inactive Publication Date: 2016-08-04
VHIT SPA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a variable displacement pump and a way to regulate its displacement. This solves issues with previous methods.

Problems solved by technology

Of course, the discharged oil volume has already been compressed, whereby high power absorption occurs, with a consequent higher fuel consumption and a greater stress of the components due to the high pressures constantly generated in the pump.
Generally, the provision of the hydraulic actuators makes electro-hydraulic systems complex and expensive.
Moreover, when the engine is off, it is impossible to modify the displacement presetting, since no control pressure is available.

Method used

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  • Variable displacement pump with electric control of displacement regulation and method of regulating pump displacement
  • Variable displacement pump with electric control of displacement regulation and method of regulating pump displacement
  • Variable displacement pump with electric control of displacement regulation and method of regulating pump displacement

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Experimental program
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first embodiment

[0021]FIG. 1 is a plan view of the pump according to the invention, from which the cover and the regulation actuator have been removed, in the minimum displacement position;

[0022]FIG. 2 is a view similar to FIG. 1, in the maximum displacement position;

[0023]FIG. 3 is a plan view similar to FIG. 2, showing the delivery rate regulation mechanism integrated in the cover;

[0024]FIG. 4 is a cross-sectional view of the pump taken according to a plane passing through line Y-Y in FIG. 3;

second embodiment

[0025]FIGS. 5 and 6 are views similar to FIGS. 1 and 2, relating to the pump according to the invention; and

[0026]FIG. 7 is a principle block diagram of the displacement regulating circuit.

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Abstract

A rotary positive displacement pump for fluids, in particular, for the lubrication of a motor vehicle engine (61), has a displacement that can be regulated through the rotation of a stator ring (42) having an eccentric cavity (43) in which the rotor (15) of the pump (1) rotates. The stator ring (42) is housed within an in eccentric cavity (13) of an external ring (12). A rotor actuator (50), controlled by the electronic control unit of the motor vehicle, causes a synchronous rotation by an equal amount in opposite directions of both rings. A method of regulating the displacement of the pump (1) and lubrication system for a motor vehicle engine in which the pump is used are also provided.

Description

TECHNICAL FIELD[0001]The present invention relates to variable displacement pumps, and more particularly it concerns a rotary positive displacement pump of the kind in which the displacement variation is obtained by means of the rotation of an eccentric ring (stator ring).[0002]The invention also concerns a method of regulating the displacement of such a pump.[0003]Preferably, but not exclusively, the present invention is employed in a pump for the lubrication oil of a motor vehicle engine.PRIOR ART[0004]It is known that, in pumps for making lubricating oil under pressure circulate in motor vehicle engines, the capacity, and hence the oil delivery rate, depends on the rotation speed of the engine. Hence, the pumps are designed so as to provide a sufficient delivery rate at low speeds, in order to ensure lubrication also under such conditions. If the pump has a fixed geometry, at high rotation speed the delivery rate exceeds the necessary rate, so that part of the delivered flow is t...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F04C14/22F01M1/02F04C2/344
CPCF01C21/106F04C2/3441F01M2001/0238F04C2240/81F01M1/02F04C14/223
Inventor CADEDDU, LEONARDOFAUDA, ALESSANDRO
Owner VHIT SPA