DE102013221701A1 - WING CELL PUMP WITH FORCED WINGS - Google Patents

Abstract

A vane pump (100) with a pump housing (101), a stroke contour ring (105) arranged therein and a rotor (110) rotatably mounted therein are proposed. The rotor has radial slots (111) in which vanes (115) are arranged so as to be displaceable in a radially displaceable manner, wherein, during operation of the vane pump (100), the vanes (115) lie with their outer ends against the inner wall of the lifting contour ring (105) along the Slide stroke contour rings (105). The rotor (110) has on one of its end faces an annular groove (122) in which an elastic clamping ring (120) is inserted, which has a meandering shape in the circumferential direction and the wings (115) at their rear or front side edges ( 115a) engages and pushes radially outward, whereby even at standstill of the vane pump (100) the wings (115) abut with their outer ends on the inner wall of Hubkonturrings (105).

Description

The invention relates to a vane pump according to the preamble of claim 1. In particular, the invention relates to a vane pump with positively driven wings.

Usually, such vane pump are constructed as follows: In a pump housing essentially a Hubkonturring and a rotatably mounted rotor are arranged. The rotor has radial slots in which wings are radially displaceable and forcibly guided through the slots. During operation of the vane pump thus the wings with their outer ends on the inner wall of the Hubkonturrings fittingly slide along the Hubkonturrings.

A vane pump of the type mentioned is eg from the DE 31 22 598 C1 known. There will be in 1 such a construction is shown. At both ends of the rotor so-called "Andrückringe 13 and 14" are attached (see also text column 2, lines 39 ff 2 ), which engage behind the wings at their side edges and hold in abutment with the inner circumference of the cam ring.

From the DE 10 2004 030 481 A1 a similar construction is known, bring in the so-called. "Unterflügelkontüringe 23" the wings to rest on the stroke contour (see there text [0016], last two sentences).

Furthermore, the DE-OS 1 751 462 a rotary vane machine with a control flange, which has so-called "cams 23", which are geometrically parallel to the lifting curve (see page 6 ff 6 - 8th ). On each cam is an oil-resistant elastomer 20 attached and thereon is an elastically resilient preformed band 22 vulcanized. The rotary wings can identify side-mounted pins (see also 12 - 14 , Elements " 38 "), The tape 42 may be formed bent in the region of the pin so that it must forcibly rotate with the rotor. This structure is constructed quite expensive.

The object of the invention is to improve a vane pump of the type mentioned so that is achieved with a low-cost construction that the wings abut even at low speed or even at a standstill close to the Hubkonturring.

The object is achieved by a vane pump with the features of claim 1.

Accordingly, a vane pump is proposed in which the rotor has on one of its end faces an annular groove in which an elastic clamping ring is inserted, which has a meandering shape in the circumferential direction. The clamping ring engages under the wings at their rear or front side edges and presses the wings radially outward, whereby even with the vane pump at standstill, the wings abut with their outer ends on the inner wall of Hubkonturrings.

As a result, a cost-effective solution is created, because such a clamping ring can be produced inexpensively; it can also be used on each end face of the rotor and the provision of an annular groove on the rotor is an easy-to-implement measure.

Preferably, the vane pump can be operated as a reversing pump, wherein the drive can be an electric motor. When starting the pump from a standstill and at slow speeds, it is now ensured by the at least one clamping ring, that the wings stet closely abut the cam ring or Hubkonturring.

The clamping ring pushes the wings according to the stroke contour to the outside and brings them into abutment (clearance compensation), which has advantages especially when cold start the vane pump, if the wings can not be pressed by a sufficient centrifugal force or Hinterflügeldruckversorgung to the outside.

Preferably, the vane pump is used in a power steering system as a steering pump, in particular as an electrically driven steering pump, which fills the steering cylinder.

The invention ensures that the wings permanently abut the cam ring to always promote even at cold start, slow turning and change of direction in reversing a sufficient volume of oil and to be tight even when bumping from the steering cylinder.

Further advantageous embodiments of the invention will become apparent from the dependent claims.

Accordingly, it is advantageous if the elastic clamping ring has an axially symmetrical, in particular sternfömige, shape with bulges and indentations. In this context, preferably corresponds to the number of indentations of the number of wings. Furthermore, it is advantageous if each of the indentations engages under one of the wings at its rear or front side edge. Thus, each wing of one of the indentations is elastically engaged, and the clamping ring rotates fixed with the rotor.

Preferably, the elastic clamping ring has a residual stress to the wings radially outward against the inner wall of Hubkonturrings to press with a sufficient contact force. It has been found that it is sufficient if the contact force generated by the clamping ring corresponds to at least 1.5 times the weight of a wing.

When dimensioning the elastic clamping ring, the following should preferably be considered: The bulges define an outer circumference and the indentations an inner circumference of the clamping ring, wherein the difference between outer circumference and inner circumference corresponds to 3 times to 5 times a wing stroke.

The elastic clamping ring can correspond to a self-contained annular body (with indentations and bulges); but it can be shaped into an annular body. In this case, it is made of a flat corrugated material which is bent in a circle so that two opposite ends of the material overlap and are joined together in the overlapping area, in particular by caulking, punching or spot welding.

The elastic clamping ring is preferably made of an injection-moldable material, in particular of a POM plastic, a PEEK plastic or a PI plastic. The abbreviation POM denotes a polyoxymethylene (also called polyacetal, polyformaldehyde or merely acetal), which corresponds to a high molecular weight thermoplastic. PEEK is a polyetheretherketone, ie a high-temperature-resistant thermoplastic material. And PI is a polyimide, another high-performance plastic, which is also particularly well suited for the production of the clamping ring.

It is also advantageous if the elastic clamping ring is provided with notches or slots. This increases the softness of the preload.

It may be advantageous if the Hubkonturring is installed in a multi-stroke, in particular doppelhubigen, execution in the pump housing. Also, it may be advantageous if the Hubkonturring is installed in an oval mounting position in the pump housing.

In the following, the invention will be described by way of example in detail with reference to the accompanying drawings, in which:

1 shows a vane pump according to the invention with a clamping ring inserted on the front side of the rotor;

2a shows the clamping ring according to the invention with its meandering shape;

2 B shows the rotor according to the invention with a frontally disposed groove for insertion of the clamping ring;

3a shows in a cross-sectional view the clamping ring inserted in the groove of the rotor;

3b shows in a detailed view of the clamping ring inserted in the groove of the rotor;

4 shows in a further cross-sectional view of the clamping ring inserted in the groove of the rotor;

5 corresponds to a partial section 1 and illustrates the wing stroke from the innermost to outermost position of the respective wing; and

6 shows as an alternative to 2a a further embodiment of the clamping ring according to the invention.

As in 1 shown, the vane pump according to the invention 100 a pump housing 101 in which a Hubkonturring 105 is arranged and a rotor 110 (see also 2 B ) is mounted rotatably mounted. The rotor has a plurality of radially aligned slots 111 on, in each case a wing 115 slidably inserted. The wings are thus positively guided and move during operation of the vane pump due to the centrifugal force to the outside, so that each wing 115 with its outer end close to the inner wall of Hubkonturring 105 is applied.

In order to achieve a concern of the wings on the Hubkonturring now even at low speed or even at standstill of the vane pump, has the rotor 110 at its front end an annular groove 112 on (see also 2 B ), into which a clamping ring 120 (see also 2a ) is inserted, which the wings 115 engages under their rear or front side edges and presses radially outward. This ensures that even at standstill of the vane pump, the wings with their outer ends closely to the inner wall of Hubkonturrings 105 issue.

It is therefore in the vane pump rotor (rotor) on at least one side surface an annular groove 112 introduced, in which the Hinterflügelkanten plunge during their entire stroke. In this ring groove 112 is the clamping ring 120 inserted, which engages under the wings at the trailing edge and presses direction curve (Hubkonturring) on investment.

How the particular 2a shows, has the clamping ring 112 in the present example, a star-shaped form. This ensures that the tension ring does not buckle inward during play compensation and when wings are retracting, but nevertheless actively supports and compensates for the large wing movements. This design also prevents the tension ring slipping due to inertia at abrupt speed changes. Preferably, the clamping ring 112 constructed axially symmetrical and has bulges 120a and indentations 120b on, with the number of indentations 120b the number of wings 115 corresponds and in the example shown is 10. Due to the symmetrical design of the clamping ring 120 It can be used in both right- and left-handed operation.

The meandering shape of the clamping ring has the advantage that the material paths from one wing to the next are quite wide and thus the stresses and the rigidity of the ring can be kept low. To increase the softness of the bias of the clamping ring may be slotted (not shown).

The clamping ring 120 is shaped so that it applies the respective contact force F of the wings from its own stress (see also 3b ). He is also designed to be stationary to the rotor 110 and the wings 115 is arranged, that rotates in the rotor. This ensures that no circumferential sliding movement of the wings on the clamping ring can come about. The clamping ring 120 only needs the lifting movement of the wings 115 in the cam ring (Hubkonturring 105 ) with its own elastic preload force to understand.

especially the 3a and 3b show the (undeformed) clamping ring, as he the wings 115 engages and this already at standstill of the rotor to the cam ring 105 with a contact force F applies. During operation of the vane pump additionally has the advantage that the blades are pressed at an increased speed of a (not shown in detail) Hinterflügeldruckversorgung to the outside, so that then the clamping ring 120 supported in terms of strength.

Due to the oval mounting position in the rotor results in a higher speed and the respective wing 115 supporting centrifugal component. This has the advantage that the Flügelanpressung must be designed only on the lower speed range, so can be relatively soft, which in turn does not increase the frictional forces of the wings in the cam ring unduly and makes the proportion at high speeds in ratio negligible.

The 4 shows in another cross section again the structure of the vane pump according to the invention, which is designed here doppelhubig.

The 5 illustrates the oval mounting position of the clamping ring 120 who wends the wings outward against the contour ring 105 suppressed. Depending on the position of the rotor are some of the wings, such as the wing 115 ' , in outer position, leaving the wing maximally out of the slot (here 111 ' ), while others of the wings, such as the wing 115 '' , are in an inner position, so that the wing is not or only slightly out of the slot (here 111 '' ) stands out.

The vane pump presented here is designed to deliver out of zero (stall) as the pump at lowest speeds. Will, as in 1 represented, the cam ring or Hubkonturring 105 installed in double-stroke design, so reduced at the same flow volume of the wing stroke, which is the clamping ring 120 unloaded, or it doubles the geometric displacement at the same wing stroke.

If the cam ring and the adjacent functional surfaces are still axisymmetric to the section lines II and II-II (s. 1 ), so you get with the symmetrical clamping ring 120 a particularly effective vane reversing pump.

Due to the shaping of the meander (curves or indentations and bulges) and their dimensioning, a different rigidity and elasticity of the clamping ring can be achieved with the same starting material.

The 6 shows as an alternative to 2a a further embodiment of the clamping ring according to the invention. The clamping ring 120 * is formed of a flat piece of material with the ends of the piece of material overlapping. In the overlapping area, the ends are preferably connected to each other by caulking.

The invention is designed for any type of vane pump, but is particularly suitable to be installed as a steering pump within a power steering system.

LIST OF REFERENCE NUMBERS

100

Vane pump

101

pump housing

105

stroke contour ring

108

Rotor shaft (electrically driven)

110

rotor

111

Slots for wings

112

Groove (ring-shaped for clamping ring)

115

Wing (radially movable, positively driven)

115a

Side surfaces of the wings

120

elastic tension ring (meandering shape, star-shaped)

120 *

 slotted embodiment

120a

bulges

120b

 indentations

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 3122598 C1 [0003]
• DE 102004030481 A1 [0004]
• DE 1751462 A [0005]

Claims (13)

Vane pump ( 100 ) with a pump housing ( 101 ), a Hubkonturring arranged therein ( 105 ) and a rotatably mounted therein rotor ( 110 ), the radial slots ( 111 ), in which wings ( 115 ) are arranged so that they can be displaced in a radially displaceable manner, wherein during operation of the vane pump ( 100 ) the wings ( 115 ) with their outer ends on the inner wall of Hubkonturrings ( 105 ) adjacent to the Hubkonturrings ( 105 ), characterized in that the rotor ( 110 ) at one of its end faces an annular groove ( 122 ), in which an elastic clamping ring ( 120 ) is inserted, which has a meandering shape in the circumferential direction and the wings ( 115 ) at their rear or front side edges ( 115a ) engages and presses radially outward, whereby even at standstill of the vane pump ( 100 ) the wings ( 115 ) with their outer ends on the inner wall of Hubkonturrings ( 105 ) issue. Vane pump ( 100 ) according to claim 1, characterized in that the elastic clamping ring ( 120 ) an axisymmetric, in particular sternfömige, shape with bulges ( 120a ) and indentations ( 120b ) having. Vane pump ( 100 ) according to claim 2, characterized in that the number of indentations ( 120b ) the number of wings ( 115 ) corresponds. Vane pump ( 100 ) according to claim 2 or 3, characterized in that the bulges ( 120a ) an outer circumference (Da) and the indentations ( 120b ) determine an inner circumference (Di) of the clamping ring, wherein the difference between the outer circumference (Da) and inner circumference (Di) corresponds to 3 times to 5 times a wing stroke. Vane pump ( 100 ) according to one of the preceding claims, characterized in that each of the recesses ( 120b ) one of the wings ( 115 ) at its rear or front side edge ( 115a ). Vane pump ( 100 ) according to one of the preceding claims, characterized in that the elastic clamping ring ( 120 ) has a residual stress around the wings ( 115 ) radially outwardly against the inner wall of Hubkonturrings ( 105 ) with a contact force (F) of at least 1.5 times the weight of a wing ( 115 ) corresponds. Vane pump ( 100 ) according to one of the preceding claims, characterized in that the elastic clamping ring ( 120 ) is provided with notches or slots. Vane pump ( 100 ) according to one of the preceding claims, characterized in that the elastic clamping ring (120 *) is made of a flat corrugated material which is bent in a circle so that two opposite ends of the material overlap and are interconnected in the overlapping area (X), in particular by caulking, punching or spot welding. Vane pump ( 100 ) according to one of the preceding claims, characterized in that the elastic clamping ring ( 120 ) is made of an injection-moldable material, in particular of a POM plastic, a PEEK plastic or a PI plastic. Vane pump ( 100 ) according to one of the preceding claims, characterized in that the Hubkonturring ( 105 ) in a multi-stroke, in particular double-stroke, design in the pump housing ( 101 ) is installed. Vane pump ( 100 ) according to one of the preceding claims, characterized in that the Hubkonturring ( 105 ) in an oval mounting position in the pump housing ( 101 ) is installed. Vane pump ( 100 ) according to one of the preceding claims, characterized in that the vane pump is designed as a reversing pump. Power steering with a vane pump ( 100 ) according to any one of the preceding claims.

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