DE102008054009A1 - Vane pump for use as lubricant pump in internal combustion engine, has four flanks comprising only line contact with corresponding groove, where flanks of spring elements are pressable against rotation direction and against line contact - Google Patents

Abstract

The pump (10) has a cage (2) and a rotor (5) that stay in effective connection with each other via four flanks (3). The flanks extend in a direction of rotation axes (8, 9) and guide grooves (11) corresponding to the flanks, where the rotation of fluid is conveyed from a fluid inlet (6) to a fluid outlet (7). The flanks have smaller thickness than the inner width of the grooves in an area that protrudes into the grooves. Each flank has only a line contact with the corresponding groove, where the flanks of spring elements (4) are pressable against a rotation direction and against the contact.

Description

The The invention relates to a vane pump with the features from the preamble of claim 1.

It is based on the German utility model DE 295 14 202 U1 out. From this document, a usable as a pump or hydraulic motor, adjustable pendulum pusher or vane pump is known. The vane pump according to the prior art has a machine housing with a fluid inlet and a fluid drain arranged substantially diametrically to the fluid inlet. In the machine housing a, about a first axis of rotation rotatably arranged, largely tubular cage is arranged. In the interior of the cage turn around a second, to the first axis of rotation arranged in parallel rotary axis rotatable rotor is arranged. The cage and the rotor are operatively connected to each other via eight pivotally mounted wings, such that upon rotation of the rotor about its axis of rotation, the tubular cage is likewise rotated over the wings. For this purpose, the wings are rotatably mounted in the tubular cage, while at the other end they are guided in grooves of the rotor. By moving the two axes of rotation to each other, the flow rate of a conveying fluid, for. As a lubricant, which is funded by the fluid inlet to the fluid drain, can be varied.

adversely on the known construction is a relatively high internal friction the vane pump, due to manufacturing tolerances. Next, the vane pump has a high internal pumping resistance at high speed and high sensitivity to contamination.

task It is the object of the present invention that o. g. To avoid disadvantages.

These The object is achieved by the features in the characterizing part of the claim 1 solved.

by virtue of the embodiment of the invention is the inner Reduces friction by minimizing rubbing surfaces and sliding speeds, because of the inventive design only there is still a line contact between the friction partners. At the same time, the internal pumping resistances are replaced by a Reduction of the working stroke of the blades in the rotor reduced. Advantageously, there is no fit for the wings necessary in the rotor, whereby the inventive Vane pump largely insensitive to dirt is. In addition, the volumes are advantageously the secondary chambers (formed by the grooves and the wings) reduced by the arrangement and shape of the wings, whereby a rotational nonuniformity of the vane pump is significantly reduced. In addition, it is advantageous the radial stroke of the wings due to the overlay reduced with a tangential movement. This allows the rotor with the same size of the vane pump be made much more stable.

The Embodiment according to claim 2 is a particularly robust and preferred embodiment.

With The embodiment according to claim 3 can the flow rate of the vane pump varies become.

in the The following is the vane pump according to the invention using a particularly preferred embodiment explained in two figures.

1 shows a section through an inventively designed vane pump.

2 shows a detailed view 1 ,

1 shows a section through an inventively designed vane pump 10 , In a machine housing 1 is a tubular, in the machine housing 1 around a first axis of rotation 8th rotatably mounted cage 2 arranged. In an unnumbered interior volume of the cage 2 is a about a second axis of rotation 9 rotatably mounted rotor 5 arranged. The Ka 2 and the rotor 5 For example, in the present embodiment, there are six wings 3 , where only one wing is numbered, in operative connection with each other. For this are the wings 3 parallel to the axes of rotation 8th . 9 swiveling in the cage 2 while at the other end they are in grooves 11 in the rotor 5 are stored. In the area of the pivotable bearing in the rotor 5 become the wings 3 of spring elements 4 against a direction of rotation of the rotor symbolically represented by an arrow 5 against a side wall of the groove 11 pressed. When operating the vane pump 10 becomes the rotatable rotor 5 driven, causing the cage 2 over the wings 3 is turned. In this case, a fluid from a fluid flow shown in dashed lines 6 to a likewise shown in dashed lines fluid drain 7 promoted. By changing the distance of the first axis of rotation 8th to the second axis of rotation 9 , substantially perpendicular to a connecting line from the fluid inlet 6 to the fluid drain 7 , a fluid delivery rate is changeable.

According to the invention, the wings 3 at least in the area that is in the grooves 11 protrudes, a smaller thickness than a clear width of the grooves 11 is, each wing 3 a single line contact with the corresponding groove 11 has and the wings 3 of spring elements 4 against a direction of rotation against the line contact can be pressed.

The vane pump according to the invention 10 may for example be made of a plastic such as ABS (Acrylbuthadienstyrol) or a metal, such as a light metal, such as aluminum or composite materials. The vane pump according to the invention 10 For example, it can be used as a lubricant pump for an internal combustion engine.

The inventive design, the internal friction is reduced by minimizing the rubbing surfaces (only line contact) and sliding speeds. Further, the internal pumping resistance by reducing the working stroke of the wings 3 in the rotor 2 minimized. In addition, advantageously no fit of the wings 3 in the rotor 2 necessary, whereby the vane pump according to the invention 10 Insensitive to dirt. In addition, the volumes of the secondary chambers are determined by the arrangement and shape of the wings 3 reduced, whereby a reduction in rotational nonuniformity is achieved. Next is the radial stroke of the wings 3 reduced by superposition of a tangential movement. This allows the rotor 2 , with the same size of the vane pump 10 , be made more stable.

The basic operating principle of the vane pump according to the invention 10 with one-sided wing system with line contact corresponds to the previously known prior art. The innovation lies in the over a wider range of a circulation one-sided investment of the wing 3 in a groove 11 in the rotor 2 , It slides or rolls the wing 3 in the groove 11 of the rotor 2 from. So that the rotor 5 the rotary motion on the cage 2 , about the wings rotatably anchored therein 3 is a coordinated shape of wings 3 and groove 11 in the rotor 5 required. The shape of the wings 3 and the grooves 11 influence each other. In addition, the shape of the wings 3 and the grooves 11 from the eccentricity (rotor 5 , Cage 2 ) and the angle of attack of the wing 3 in the cage 2 affected. For a continuous power transmission is possible, the groove 11 be shaped so that the degree of freedom of the wing 3 is limited over a range of one revolution (360 ° divided by the number of blades) so far that the force can be transmitted via positive engagement.

It is also conceivable, however, a kinematic reversal, ie the wings 3 are pivotable in the hub 5 stored and the working stroke compensation is by appropriately shaped grooves 11 in the cage 2 guaranteed.

2 shows a detail view of a grand piano 3 with a spring element 4 out 1 ,

• – Verringerung der inneren Reibung, weniger Verschleiß;
• – Innerer Pumpwiderstand wird reduziert;
• – Unempfindlichkeit gegen Schmutz;
• – Geringere Anfälligkeit gegen Kavitation;
• – Geringere innere Verschäumung des Fluids.

Again the advantages of the vane pump according to the invention 10 in keywords:

• - Reduction of internal friction, less wear;
• - Internal pumping resistance is reduced;
• - insensitivity to dirt;
• - Less susceptibility to cavitation;
• - Lower internal foaming of the fluid.

1

machine housing

2

Cage

3

wing

4

spring element

5

rotor

6

fluid inflow

7

fluid outflow

8th

first axis of rotation

9

second axis of rotation

10

Vane pump

11

groove

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 29514202 U1 [0002]

Claims (3)

Vane pump ( 10 ) in a machine housing ( 1 ) with a fluid inflow ( 6 ) and a largely diametrically to the fluid flow ( 6 ) arranged fluid outflow ( 7 ) and with one, in the machine housing ( 1 ) about a first axis of rotation ( 8th ) rotatably arranged, largely tubular cage ( 2 ) and with one, in an interior of the cage ( 2 ), to a second, to the first axis of rotation ( 8th ) parallel axis of rotation ( 9 ) rotatable rotor ( 5 ), with the cage ( 2 ) and the rotor ( 5 ) over at least four, on the one hand coaxial with the axes of rotation ( 8th . 9 ) pivotally mounted and on the other hand in the direction of the axes of rotation ( 8th . 9 ), to the wings ( 3 ) corresponding grooves ( 11 ) guided wings ( 3 ) are in operative connection with one another in such a way that upon rotation of the rotor ( 5 ) the cage ( 2 ) is rotatable, wherein the rotation of a fluid from the fluid inlet ( 6 ) to the fluid drain ( 7 ), characterized in that the wings ( 3 ) at least in the region that enters the grooves ( 11 ) protrudes, have a smaller thickness than a clear width of the grooves ( 11 ), each wing ( 3 ) a single line contact with the corresponding groove ( 11 ) and the wings ( 3 ) of spring elements ( 4 ) are pressed against a direction of rotation against the line contact. Vane pump according to claim 1, characterized in that the wings ( 3 ) in the rotor ( 5 ) or in the cage ( 2 ) are pivotally mounted and the spring elements ( 4 ) are arranged in the region of the pivotable bearings. Vane pump according to claim 1 or 2, characterized in that the second axis of rotation ( 9 ) of the rotor ( 5 ) to the first axis of rotation ( 8th ) of the cage ( 2 ) substantially transversely to a connecting line from the fluid inlet ( 6 ) to the fluid drain ( 7 ) is displaceable in parallel.