DE102010040452A1 - Method for adjusting a lifting ring of a vane pump - Google Patents

Abstract

A method for adjusting a cam ring of a vane pump which has a rotor which is rotatably mounted about an axis of rotation and which is arranged in a pump chamber radially delimited by the cam ring, with an imaginary connecting line between the axis of rotation of the rotor and a center point of the cam ring having a positive x-direction defined, has method steps for preparing the vane pump in such a way that the cam ring is movable, for moving the cam ring in the x direction into a reference position in which the rotor rests against the cam ring when the rotor assumes an angular position in which a maximum radius of the The rotor is oriented in the negative x-direction, for moving the cam ring from the reference position in the negative x-direction or the rotor in the positive x-direction by a value of a defined radial play, and for fixing the cam ring.

Description

The invention relates to a method for adjusting a lifting ring of a vane pump according to the preamble of patent claim 1.

State of the art

Vane or rotary vane pumps are known in the art. Typically, a vane pump has a rotor in which vanes or vanes are guided in grooves in a substantially radial direction. The rotor is mounted eccentrically and rotatably in a pump space bounded by a stator within a pump housing. The pump chamber has at least one intake and one exhaust passage. If the rotor is set in rotation, the medium to be pumped, for example air, is sucked in via the intake duct, compressed by the rotation of the rotor within a partial chamber of the pump chamber delimited by two of the vanes and discharged at the outlet duct.

Decisive for the performance of the vane pump is the so-called radial clearance between the rotor and the stator at the narrowest point. This is usually on the order of a few micrometers and determines the leakage flow from the high pressure to the low pressure side. In order to keep the leakage losses as low as possible, it is endeavored to set the radial clearance also as low as possible. However, in any case, the radial clearance must be so great that the radial play is not reduced to zero in any position of the vane pump over all operating states of the vane-cell pump. Otherwise, a loosening of the rotor threatens the stator, which can lead to damage of the vane pump.

Disclosure of the invention

Object of the present invention is therefore to provide a method for adjusting a cam ring of a vane pump. This object is achieved by a method having the features of claim 1. Preferred developments are specified in the dependent claims.

An inventive method for adjusting a cam ring of a vane pump having a rotatably mounted about a rotation axis rotor which is arranged in a radially limited by the cam ring pump chamber, wherein an imaginary line connecting the axis of rotation of the rotor and a center of the cam ring a positive x Direction defined, has steps to process the vane pump such that the cam ring is movable, for moving the cam ring in the x direction to a reference position in which the rotor rests against the cam ring when the rotor assumes an angular position in which a maximum radius of the rotor is oriented in the negative x-direction, for shifting the cam from the reference position in the negative x-direction or the rotor in the positive x-direction, by a value of a fixed radial clearance, and for fixing the cam ring. Advantageously, this method allows to compensate for manufacturing tolerances of the components of the vane pump, in particular an out-of-roundness of the rotor.

Preferably, the vane pump is prepared in the first method step such that the cam ring is movable only in the x direction. Advantageously, this facilitates the use of the method and increases the accuracy of the adjustment of the cam ring.

Also preferably, the rotor is rotated about its axis of rotation during the second process step. Advantageously, thereby facilitating the finding of those angular position of the rotor, in which the maximum radius of the rotor is oriented in the negative x-direction to the lifting ring.

It is expedient to enable the rotor in this case by means of a motor in rotation. Advantageously, an already existing in the vane pump motor for driving the rotor can be used for this purpose.

Particularly preferably, the cam ring is pressed resiliently in the x-direction against the rotor during the second method step. Advantageously, the lifting ring then executes a pendulum movement in the x-direction caused by the rotation of the rotor and minimal eccentricities of the rotor, by means of which the reference position of the lifting ring can be easily determined.

Particularly preferred for determining the reference position during the second method step with a measuring device, a maximum deflection of the cam ring is determined in the negative x direction. Advantageously, the reference position can then be read on the basis of the maximum amplitude of the oscillating movement performed by the lifting ring.

The invention will now be explained in more detail with reference to the accompanying figures. Showing:

1 a representation of a vane pump;

2 a more schematic view of the vane pump;

3 a schematic representation of a first method step for adjusting a cam ring of the vane pump; and

4 a schematic representation of a second method step in the adjustment of the cam ring of the vane pump.

1 shows a section of a vane pump 100 in partially assembled condition. The vane pump 100 can also be referred to as a rotary vane pump. The vane pump 100 can be used as a vacuum pump to evacuate a room. For example, the vane pump 100 serve for evacuating a brake booster in a motor vehicle.

The vane pump 100 has an in 1 only partially illustrated pump housing 130 on. In the pump housing 130 is a pump room 110 provided, which is radially by a lifting ring 300 is limited. The pump room 110 has at least one inlet or suction and an outlet channel, which in 1 are not recognizable.

Inside the pump room 110 is a rotor 200 arranged. The rotor 200 has a circular disc or cylindrical disc-shaped basic shape and is about an axis of rotation 210 rotatably mounted. The rotor 200 is eccentric in the pump room 110 arranged. That means the rotation axis 210 of the rotor 200 not with the center of the pump room 110 or the center of the pump room 110 radially limiting cam ring 300 coincides. The rotor 200 can by a motor, not shown in a rotation about the axis of rotation 210 in one direction of rotation 220 be offset.

The rotor 200 has at least one groove 240 , usually a plurality of grooves 240 , on, in which each wing 250 are arranged displaceably in a substantially radial direction. In the example of 1 points the rotor 200 three grooves 240 on, in which three wings 250 are arranged. In the example of 1 are the grooves 240 not exactly oriented in the radial direction, but by a certain angle against the direction of rotation 220 tilted. The grooves 240 and wings 250 However, they could also be oriented differently. It could also be more or less than three grooves 240 and three wings 250 be provided.

Will the rotor 200 through the motor in a rotation in the direction of rotation 220 offset, so the medium to be pumped, for example, air is sucked on the intake passage, not shown, and by the rotation of the rotor 200 within one of two of the wings 250 limited sub-chamber of the pump chamber 110 compressed until the medium to be pumped reaches the outlet channel and is released there against the pressure prevailing on the outlet side.

Decisive for the pumping capacity of the vane pump 100 is the so-called radial play 120 So the distance between the pump room 110 limiting inner wall of the cam ring 300 and the peripheral surface of the rotor 200 at the point of the smallest distance between the lifting ring 300 and rotor 200 , This radial clearance should be on the order of one micron and determines the leakage flow from the high pressure side of the pump chamber 110 to the low pressure side of the pump room 110 , Is this radial play 120 too big, so there is a strong leakage, what the pumping power of the vane pump 100 reduced. Is this radial play 120 too low, so there is a risk that the rotor 200 under certain operating conditions, for example when heating the vane pump 100 , in contact with the cam ring 300 comes, causing damage to the vane pump 100 can cause. When setting the radial play 120 It should also be noted that the rotor 200 due to manufacturing tolerances does not have a perfect circular disk shape. Instead, the radius of the rotor varies 200 around the axis of rotation 210 ,

2 shows a more schematic view of the vane pump 100 , It was on a representation of the grooves 240 and wings 250 of the rotor 200 waived. It is recognizable that a center 310 of the cam ring 300 not with the rotation axis 210 of the rotor 200 coincides, the rotor 200 so eccentric in the pump room 110 is arranged. An imaginary connecting line between the axis of rotation 210 of the rotor 200 and the center 310 of the cam ring 300 defines a positive x-direction.

The range of the smallest distance between the rotor 200 and the cam ring 300 , the radial play 120 defined, then also lies on the x-axis. If the rotor 200 does not have a perfect circular shape, as in 3 and 4 shown in strong elevation, so is the radial play 120 from the angular position of the rotor 200 dependent. However, the radial play should 120 in no angular position of the rotor 200 fall below a specified minimum value. The following explains a method, the radial play 120 adjust so that this condition is met.

For this purpose, the vane pump 100 initially constructed or partially assembled in a device such that at least the lifting ring 300 remains mobile. The lifting ring is preferred 300 However, it led so that he only in the in 2 defined x-direction is displaceable.

Subsequently, the lifting ring 300 in positive x-direction against the rotor 200 pressed. The pressing of the cam ring 300 For example, by a spring-mounted Andrück- and measuring device 400 done as in 3 and 4 is indicated schematically.

In the general case, the rotor 200 no perfect circular disk shape. This is in 3 and 4 shown greatly exaggerated. Will the rotor 200 around its axis of rotation 210 turned and the cam ring 300 simultaneously by the Andrück- and measuring device 400 resilient in positive x-direction against the rotor 200 pressed, follows the cam ring 300 the outer contour of the rotor 200 , In an angular position of the rotor 200 in which a maximum radius 230 of the rotor 200 not exactly oriented in negative x-direction, take the stroke ring 300 and thus also the center 310 of the cam ring 300 a first position 320 a, like in 3 shown. In an angular position of the rotor 200 in which its maximum radius 230 oriented exactly in negative x-direction, as in 4 shown, take the lifting ring 300 and thus also the center 310 of the cam ring 300 a second position as the reference position 330 is designated, and the opposite to the first position 320 is shifted in negative x-direction.

Will the rotor 200 So acted upon by a speed, for example by the in the vane pump 100 anyway existing engine, so the center leads 310 of the cam ring 300 an oscillating movement along the x-axis against that by the Andrück- and measuring device 400 exerted force. The reference position 330 , ie the position of the center furthest in the negative x-direction 310 of the cam ring 300 can then simply by means of Andrück- and measuring device 400 be determined. Alternatively, the devices for pressing the cam ring 300 to the rotor 200 and for determining the reference position 330 also be carried out separately. For example, a measuring device could be arranged at the opposite end of the pressing device.

Once the reference position 330 is determined, the rotation of the rotor 200 to be ended. Starting from the reference position 330 becomes the lifting ring 300 now by means of an adjusting device, for example by means of a micrometer screw to the desired radial clearance 120 proceed in negative x-direction. Alternatively, the lifting ring 300 also in the reference position 330 held and the pump housing 130 the vane pump 100 together with the rotor 200 be moved in positive x-direction.

Now the lifting ring 300 relative to the rotor 200 be fixed. This can be done, for example, by screwing a pump head of the vane pump 100 respectively. The radial play 120 the vane pump 100 is then set to be the specified minimum value around which the cam ring 300 compared to the determined reference position 330 was shifted, in any angular position of the rotor 200 below. As a result, despite any existing manufacturing tolerances, a safe and low leakage operation of the vane pump 100 guaranteed.

Claims (6)

Method for adjusting a cam ring ( 300 ) a vane pump ( 100 ), whereby the vane pump ( 100 ) one about a rotation axis ( 210 ) rotatably mounted rotor ( 200 ), which in one through the lifting ring ( 300 ) radially limited pump space ( 110 ), wherein an imaginary connecting line between the axis of rotation ( 210 ) of the rotor ( 200 ) and a midpoint ( 310 ) of the cam ring ( 300 ) defines a positive x-direction, characterized by the following method steps: 1) Preparation of the vane pump ( 100 ) such that the lifting ring ( 300 ) is movable; 2) Moving the cam ring ( 300 ) in the x-direction into a reference position ( 330 ), in which the rotor ( 200 ) on the stroke ring ( 300 ) is applied when the rotor ( 200 ) assumes an angular position in which a maximum radius ( 230 ) of the rotor ( 200 ) is oriented in negative x-direction; 3) Moving the cam ring ( 300 ) from the reference position ( 330 ) in the negative x-direction or the rotor ( 200 ) in the positive x-direction by a value of a fixed radial clearance ( 120 ); 4) fixing the cam ring ( 300 ). Method according to claim 1, characterized in that the vane pump ( 100 ) is prepared in the first method step such that the lifting ring ( 300 ) is movable only in the x direction. Method according to one of claims 1 or 2, characterized in that the rotor ( 200 ) during the second process step about its axis of rotation ( 210 ) is rotated. Method according to claim 3, characterized in that the rotor ( 200 ) is rotated by means of a motor. Method according to one of claims 3 or 4, characterized in that the lifting ring ( 300 ) during the second method step resiliently in the x-direction against the rotor ( 200 ) is pressed. A method according to claim 5, characterized in that for determining the reference position ( 330 ) during the second method step with a measuring device a maximum deflection of the cam ring ( 300 ) in negative x-direction.

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