EP3265652A2

EP3265652A2 - Pump with vanes

Info

Publication number: EP3265652A2
Application number: EP16707923.5A
Authority: EP
Inventors: Olivier BALENGHIEN; Brice Lafon
Original assignee: PSA Automobiles SA
Current assignee: Stellantis Auto SAS
Priority date: 2015-03-02
Filing date: 2016-02-16
Publication date: 2018-01-10
Also published as: CN107438699A; CN107438699B; WO2016139400A2; FR3033370A1; WO2016139400A3; FR3033370B1

Abstract

Pump (100) with vanes (1) comprising a stator (2), a rotor (5) which is eccentric with respect to the stator (2) and rotating around the latter, each vane (1) exhibiting an angular offset with respect to a theoretical position for which this vane (1) would exhibit, together with all the other vanes (1) of the pump (100), a regular angular distribution with respect to a centre, the angular offset of the vanes (1) following a pseudo-random binary sequence, a "1" or "0" bit of this sequence corresponding respectively to an angular offset of a vane (1) in a first direction of rotation or in a second direction of rotation opposite to the first direction of rotation, this binary sequence being calculated via a sequence scrambling method Scrambler, this method being an additive method applying a pseudo-random binary sequence PRBS.

Description

VANE PUMP

The invention relates to the field of acoustics and vibration for rotary pumps in motor vehicles, such as vane pumps.

Among the existing rotary pumps, the vane pump allows the transfer of a pumped fluid, thanks to a plurality of pallets, secured to a rotor in rotation around a stator, the pallets sliding radially via a set of springs and under the effect of centrifugal force. For example, a pallet pump in a motor vehicle is in the form of:

an oil pump constituting the lubrication system of a heat engine, permitting the supply of crankshaft oil, as well as the various elements of this engine;

- pump for transporting fuel;

hydraulic pump constituting a hydraulic machine for a hybrid vehicle equipped with such a machine.

Many automotive applications include rotary pumps, which can be realized in the form of vane pumps, such as those presented above, but also in the form of radial or axial piston pumps, screw pumps, or gear pumps.

Generally, to improve the acoustic performance of rotary pumps, car manufacturers leave their suppliers to size these pumps, while imposing an overall technical specification. The acoustic specifications strongly constrain the suppliers for the choice of the components of the rotary pumps, limit the general performance of these pumps, and impose additional costs to the realization.

Moreover, a problem commonly known rotary pumps lies in the sound of siren emitted by them. For example, a pump uniformly distributed blades periodically emits harmonics, because the blades of this pump succeed each other regularly. This results in an acute noise dominating the overall noise of this pump, which can be felt as annoying by the driver and passengers of the vehicle. In order to reduce the overall noise of rotary pumps, as well as siren noise, there are many solutions in the current state of the art. By way of example, the document FR2666124 describes a pump with vanes or internal gears, the rotary elements of which are designed so that for each discharge cell, either a minimum and / or maximum volume value or a different yield.

Such an embodiment, like those of the current technological background, has the sole purpose of reducing the overall noise of rotating pumps and / or limit siren noise. The realization of these solutions therefore remains subject to the acoustic specifications of the car manufacturer, and the costs of research induced. As a result, the overall performance of these pumps is therefore limited.

A first objective is to overcome all the aforementioned drawbacks.

A second objective is to minimize the siren noise of rotary pumps.

A third objective is to reduce the overall noise stress imposed on rotary pumps by specifications, and thus allow the realization of rotary pumps at lower costs.

A fourth objective is to modify the color of the noise of the rotary pumps, and therefore the perception of this noise by the driver and the passengers of a vehicle, in order to alleviate the overall noise constraint imposed during the realization. of these pumps.

A fifth objective is to provide rotary pumps whose noise color approaching closer to the noise of a heat engine, so as to raise the maximum acceptable overall acceptable noise, and thus improve the performance of these pumps.

For this purpose, it is proposed, in a first aspect, a vane pump comprising a stator, a suction port and a fluid discharge port made through the stator, respectively allowing suction and discharge. a fluid through the pump, a rotor eccentric relative to the stator and rotating around the latter, each pallet having an angular offset from a theoretical position for which this pallet would present, with all other pallets of the pump, a regular angular distribution by relative to a center, the angular offset of the pallets according to a pseudo-random binary sequence, a "1" or "0" bit of this sequence respectively corresponding to an angular offset of a pallet in a first direction of rotation or in a second direction of rotation opposite to the first direction of rotation, this binary sequence being calculated via a scrambler sequence scrambling method, this method being an additive method applying a pseudo-random binary sequence PRBS.

Advantageously, for this vane pump, the bits "1" and "0" of the binary pseudo-random sequence PRBS delimit a range of angular offset range for the pallets.

Advantageously, for this vane pump, the limit extent of the range of angular offset of the pallets is determined as a function of an unbalance induced by the pallets.

Advantageously, this vane pump comprises seven pallets, each pallet having an angular offset according to the following binary sequence: 1; 0; 0; 1; 0; 1; 1.

Advantageously, for this vane pump, the extent of the angular offset range of the pallets is at least 5 °.

Advantageously, when the vane pump comprises one to eight pallets, the pallets are angularly offset in a pseudo-random binary sequence PRBS 2 ³ , this sequence comprising respectively the same number of bits as pallets.

Advantageously, when this vane pump comprises pallets, with a> 8, the pallets are angularly offset in a pseudo-random binary sequence PRBS 2 ^k , with 2 ^{k "} + 1≤n≤2 ^k and an integer k> 3, the pseudo-random bit sequence comprising respectively the same number of bits as pallets.

Advantageously, the vane pump is an oil pump constituting a lubrication system.

It is proposed, in a second aspect, a motor vehicle, comprising a vane pump as summarized above.

Other objects and advantages of the invention will become apparent in the light of the description of embodiments, given below with reference to the accompanying drawings in which:

- Figure 1 is a perspective view of a vane pump;

Figure 2 is a sectional view of the same vane pump; Figure 3 is a sectional view of a vane pump according to one embodiment.

In Figure 1 is shown a pump 100 with vane 1. The pump 100 vane 1 allows the transport of a fluid, such as oil. However, any other fluid can be transported via such a pump, for example water or fuel. The vane pump 100 is formed from the following elements:

a stator 2 fixed in the body of the pump 100, the body of the pump is, for example, a cast iron body;

- A suction port 3 and a fluid discharge port 4 made through the stator 2, respectively for the suction and discharge of a fluid through the pump 100;

a rotor 5 eccentric with respect to the stator 2, and in rotation around the latter;

- The radial movable elements integral with the rotor 5. The movable elements for such a pump 100 are here pallets 1 (or blades) integral with the rotor 5, these pallets 1 sliding radially in grooves 6 of the rotor 5. As an example , the pallets 1 are of rectangular or trapezoidal shape, of small thickness, and slide in the grooves 6 of the rotor 5 via a set of springs.

The rotation of the rotor 5, in a direction of rotation R, is used to press the pallets 1 on the stator 2. Thus, each spacing between two successive pallets 1 forms a cell 7 for the transport of a fluid. According to the embodiments envisaged, each cell 7 may or may not be sealed. Advantageously, the eccentricity of the rotor 5 relative to the stator 2 allows the creation of a circular ring in the pump 100, the volume of this ring being distributed between the different cells 7. Thus, each cell 7 relates to a different volume depending on the angular position of the pallets 1 delimiting it.

When a first pallet 1 rotating in the direction of rotation R of the rotor 5 passes in front of the suction port 3, the volume of its corresponding cell 7 increases, which has the effect of creating a phase of suction of the fluid in this cell 7. The passage of a second pallet 1 succeeding the first pallet 1 in the direction of rotation R, then close the volume of the cell 7. The fluid contained in the cell 7 is then conveyed by rotation towards the port 4 of repression during a transfer phase. At the end of the transfer phase, the volume of the cell 7 decreases, which has the effect of compressing the fluid transported and therefore increasing its pressure. Thus, during the passage of the first pallet 1 in front of the discharge port 4, the fluid under the effect of its pressure, escapes from the cell 7 via the discharge port 4.

Commonly, the longitudinal axes of the pallets 1 of the rotor 5 are regularly arranged and aligned with respect to the center Cr of the rotor 5, thus having regular angular distributions. By way of example, for a pump comprising seven pallets 1, such as that illustrated in FIG. 2, the "central" axis of each pallet 1 (and its corresponding groove 6) is aligned with the center Cr of the rotor 5 and has an angular difference of 360/7 = 51.42 ° with the respective "central" axes of its two neighboring pallets 1. Such an even distribution of the pallets 1 then induces a predominant siren noise in the pump 100.

To overcome this drawback, according to various embodiments, each pallet 1 of the pump 100, and its respective groove 6, has an angular offset with respect to a theoretical position for which this pallet 1 would present, with the all other pallets 1 of the pump 100, a regular angular distribution with respect to a center. This theoretical angular distribution is, for example, carried out with respect to the center Cr of the rotor 5, with respect to the center Cs of the stator 2, or relative to any other predetermined point.

An exemplary embodiment for a pump 100 to seven pallets 1 is illustrated in Figure 3. In this figure, the pallets 1, and their groove 6, have an angular offset from the center Cr of the rotor 5. It can be seen from this figure, by comparison with FIG. 2, that the pallets 1 are offset angularly with respect to an equiangular pallet configuration 1 (without angular displacement).

According to various embodiments, the sequence scrambling method, commonly known as the Scrambler method (denomination used hereinafter), is implemented to determine the angular offset of each pallet 1, according to a binary sequence. pseudo-random generated via this method.

Advantageously, the angular offset of the pallets 1 according to a binary sequence generated via the Scrambler method allows, from an acoustic point of view, the vane pump 100 1: to approach as closely as possible the noise coloration of a combustion engine of a motor vehicle;

to attenuate the siren noise related to the harmonics of this pump 100. More specifically, the scrambler sequence scrambling method makes it possible to eliminate the dependence of the acoustic power spectrum of the pump 100 on the original signal, here the harmonics of the vane pump 100, making this spectrum more dispersed, and spreading the maximum acoustic energy, which remains constant, over a wider frequency band.

There are two types of commonly known Scrambler method:

a multiplicative method, executing a multiplication of an input signal by a Scrambler transfer function, to yield discrete linear systems;

an additive method, by the addition (via an exclusive "OR") of two-by-two modules, transforming a sequence of data into a sequence of pseudo-random data, via the application of a pseudo-random binary sequence known under the name of PRBS, acronym for "Pseudorandom binary sequence".

The additive Scrambler method has been identified here as presenting the best results for approaching the noise coloration of an automotive heat engine. This method was therefore used to determine the angular offset specific to each pallet 1 of the pump

100.

Thus, the pump 100 to seven pallets 1 of Figure 3 has angular shifts of pallets 1, determined according to the additive Scrambler method, via the application of a binary pseudo-random sequence PRBS. The term "pseudo-random" means, here, that each bit of the binary sequence is independent of the others, but that this sequence is periodic, therefore deterministic. For example, the pseudo-random binary sequence PRBS 2 ^{3 has} a sequence periodicity starting from the eighth (= 2 ³ ) value. This sequence is recalled below for purposes of understanding, and may include more values. As will be explained later, the highlighted binary sequences are preferred:

a value: 1

two values: 1; 0 three values: 1; 0; 0

four values: 1; 0; 0; 1

five values: 1; 0; 0; 1; 0

six values: 1; 0; 0; 1; 0; 1

seven values: 1; 0; 0; 1; 0; 1; 1

eight values: 1; 0; 0; 1; 0; 1; 1; 1

nine values: 1; 0; 0; 1; 0; 1; 1; 1; 0

ten values: 1; 0; 0; 1; 0; 1; 1; 1; 0; 0

eleven values: 1; 0; 0; 1; 0; 1; 1; 1; 0; 0; 1

twelve values: 1; 0; 0; 1; 0; 1; 1; 1; 0; 0; 1; 0

thirteen values: 1; 0; 0; 1; 0; 1; 1; 1; 0; 0; 1; 0; 1

fourteen values: 1; 0; 0; 1; 0; 1; 1; 1; 0; 0; 1; 0; 1; 1

fifteen values: 1; 0; 0; 1; 0; 1; 1; 1; 0; 0; 1; 0; 1; 1; 1

sixteen values: 1; 0; 0; 1; 0; 1; 1; 1; 0; 0; 1; 0; 1; 1; 1; 0;

seventeen values: 1; 0; 0; 1; 0; 1; 1; 1; 0; 0; 1; 0; 1; 1; 1; 0; 0;

eighteen values: 1; 0; 0; 1; 0; 1; 1; 1; 0; 0; 1; 0; 1; 1; 1; 0; 0; 1;

nineteen values: 1; 0; 0; 1; 0; 1; 1; 1; 0; 0; 1; 0; 1; 1; 1; 0; 0; 1; 0;

twenty values: 1; 0; 0; 1; 0; 1; 1; 1; 0; 0; 1; 0; 1; 1; 1; 0; 0; 1; 0; 1;

Advantageously, the angular position of a pallet 1 corresponds respectively to a single bit of the sequence PRBS 2 ³ . Thus, a bit sequence is chosen that comprises the same number of bits as pallets 1. Thus, for the pump 100 with seven pallets 1, the binary sequence with seven values 1 is used; 0; 0; 1; 0; 1; 1. The angular position of each pallet 1 is then a function of this pseudo-random sequence of bits. More precisely, each bit of this sequence corresponds respectively to an angular offset of a pallet 1. This angular offset is defined with respect to a theoretical position for which this pallet 1 would present, with all the other pallets 1 of the pump 100. , a regular angular distribution with respect to a center. This center is, for example, the center Cr of the rotor 5, the center Cs of the stator 2, or any other predefined point.

For example, it is possible conventionally to associate:

each bit "1" at an angular offset of a pallet 1 in a first direction, for example the direction R of rotation of the rotor 5;

each bit "0" at an angular offset of a pallet 1, in a second direction opposite to the first direction, for example a direction opposite to the direction R of rotation of the rotor 5. Thus, in the example of Figure 3, starting from a starting position D, and reading in the clockwise direction, it is clear that the angular offsets of the pallets 1, symbolized by curved arrows, follow. the binary sequence with seven values 1; 0; 0; 1; 0; 1; 1 of the pseudo-random binary sequence PRBS 2 ³ .

Therefore, each pallet 1 is located at each end at an end of an angular offset range delimited by the angular offset values associated with the bits "0", "1" of the pseudo-random binary sequence PRBS. . The values setting the total extent of this range of angular offset are chosen according to a maximum unbalance allowed by the pump 100. This unbalance can, for example, be determined theoretically, or experimentally, according to the different possibilities of combinations of angular offsets of pallets 1.

Advantageously, the greater the allowed angular offsets, the greater the angular distribution of the pallets 1 is effective on the attenuation of the siren noise. Thus, the bits "1", "0" of the bit sequence are assigned an angular offset value to be applied to the pallets 1, these values being chosen according to the feasible / allowed extent of the offset range. By way of example, for the pump 100 with seven pallets 1 of FIG. 3, it is possible to choose the following ranges of angular ranges:

a range of angular offset range of 4 °, for example by replacing the bits "0" and "1" of the binary sequence PRBS by the values of angular offsets "-2 ° and 2 °", "-1 ° and 3 ° "," 0 ° and 4 ° "or" -3 ° and 1 ⁰ ";

a range of angular offset range of 5 °, for example by replacing the bits "0" and "1" of the binary sequence PRBS by the values of angular offsets "-2.5 ° and 2.5 °", "-2 ° and 3" ° "," 0 ° and 5 ° "or" -3 ° and 2 ° ";

a range of angular offset range of 6 °, for example by replacing the bits "0" and "1" of the binary sequence PRBS by the values of angular offsets "-3 ° and 3 °", "-4 = and 2 ° "," 0 ° and 6 ° "or" -2 ° and 4 ° ".

Advantageously, for a pump 100 to seven pallets 1, and to obtain a noticeable efficiency, is preferred an angular offset range of at least 5 °. Advantageously, the use of pseudo-random binary sequences PRBS 2 ³ of one to eight values (sequences previously highlighted) for pumps 100 with pallets 1 comprising respectively one to eight pallets 1 is favored. from the eighth value of the sequence PRBS ²³ , a "repetition" of bits related to its periodicity. Thus, for a higher number of pallets 1, higher order PRBS sequences are preferred, in order to adapt the periodicity of these sequences to the number of pallets 1 of the pump 100.

According to various embodiments, the angular offset of the pallets 1 of the pump 100 according to a sequence of the scrambler additive scrambler sequence applying a pseudo-random binary sequence PRBS, is applicable to a number n. any pallets 1.

By way of example, for 9 <n≤16, the angular offset of the pallets 1 respectively follows a pseudo-random binary sequence PRBS

2 ⁴ from nine to sixteen values preferentially, in order to obtain optimal results. The periodicity of this pseudo-random sequence is observable from the sixteenth (= 2 ⁴ ) value. For another number of pallets 1, the other PRBS 2 ⁴ sequences can also be used, but nevertheless have less good results for approximating the motor staining.

The sequences relating to a pump 100 of nine to sixteen pallets 1, highlighted below, are therefore preferred:

a palette: 1

two pallets: 1; 0

three pallets: 1; 0; 0

four pallets: 1; 0; 0; 0

five pallets: 1; 0; 0; 0; 1

six pallets: 1; 0; 0; 0; 1; 0

seven pallets: 1; 0; 0; 0; 1; 0; 0

eight pallets: 1; 0; 0; 0; 1; 0; 0; 1

nine pallets: 1; 0; 0; 0; 1; 0; 0; 1; 1

ten palettes: 1; 0; 0; 0; 1; 0; 0; 1; 1; 0

eleven palettes: 1; 0; 0; 0; 1; 0; 0; 1; 1; 0; 1

twelve palettes: 1; 0; 0; 0; 1; 0; 0; 1; 1; 0; 1; 0

thirteen palettes: 1: 0: 0: 0: 1: 0: 0: 1: 1: 0: 1: 0: 1

fourteen palettes: 1: 0: 0: 0: 1: 0: 0: 1: 1: 0: 1: 0: 1: 1

fifteen palettes: 1: 0: 0: 0: 1: 0: 0: 1: 1: 0: 1: 0: 1: 1: 1 sixteen palettes: 1: 0: 0: 0: 1: 0: 0: 1: 1: 0: 1: 0: 1: 1: 1: 1

seventeen palettes: 1; 0; 0; 0; 1; 0; 0; 1; 1; 0; 1; 0; 1; 1; 1; 1; 0

eighteen palettes: 1; 0; 0; 0; 1; 0; 0; 1; 1; 0; 1; 0; 1; 1; 1; 1; 0; 0

nineteen palettes: 1; 0; 0; 0; 1; 0; 0; 1; 1; 0; 1; 0; 1; 1; 1; 1; 0; 0; 0;

twenty palettes: 1; 0; 0; 0; 1; 0; 0; 1; 1; 0; 1; 0; 1; 1; 1; 1; 0; 0; 0;

In another example, for 17 <n≤32, the angular offset of the pallets 1 preferably follows a pseudo-random binary sequence PRBS ²⁵ in order to obtain optimal results. For example, the PRBS May ² are highlighted below Preferred sequences for a pump 100 comprising seventeen to twenty respectively pallets 1. For another number of pallets 1, other sequences may also be used, but present less good results to approximate the motor staining,

a palette: 1

two pallets: 1; 0

three pallets: 1; 0; 0

four pallets: 1; 0; 0; 0

five pallets: 1; 0; 0; 0; 0

six pallets: 1; 0; 0; 0; 0; 1

seven pallets: 1; 0; 0; 0; 0; 1; 0

eight pallets: 1; 0; 0; 0; 0; 1; 0; 0

nine pallets: 1; 0; 0; 0; 0; 1; 0; 0; 0

ten palettes: 1; 0; 0; 0; 0; 1; 0; 0; 0; 1

eleven palettes: 1; 0; 0; 0; 0; 1; 0; 0; 0; 1; 1

twelve palettes: 1; 0; 0; 0; 0; 1; 0; 0; 0; 1; 1; 0

thirteen palettes: 1; 0; 0; 0; 0; 1; 0; 0; 0; 1; 1; 0; 0

fourteen palettes: 1; 0; 0; 0; 0; 1; 0; 0; 0; 1; 1; 0; 0; 1

fifteen palettes: 1; 0; 0; 0; 0; 1; 0; 0; 0; 1; 1; 0; 0; 1; 0

sixteen palettes: 1; 0; 0; 0; 0; 1; 0; 0; 0; 1; 1; 0; 0; 1; 0; 1;

seventeen palettes: 1; 0; 0; 0; 0; 1; 0; 0; 0; 1; 1; 0; 0; 1; 0; 1; 0

eighteen palettes: 1; 0; 0; 0; 0; 1; 0; 0; 0; 1; 1; 0; 0; 1; 0; 1; 0; 1

nineteen palettes: 1; 0; 0; 0; 0; 1; 0; 0; 0; 1; 1; 0; 0; 1; 0; 1; 0; 1; 1 twenty pallets: 1; 0; ; 0; 0; 1; 0; 0; 0; 1; 1; 0; 0; 1; 0; 1; 0; 1; 1; 1;

More generally, for n. pallets 1, when a> 8, and for an integer k> 3, when 2 ^{k ~} + 1 <n≤2 ^k , we favor an angular offset of the pallets 1 according to a binary pseudo-random sequence PRBS 2 ^k (periodic from of the ^kth value 2), comprising an even number of bit pallets 1, this sequence being obtained via the Scrambler additive sequence scrambling method.

The embodiments described above refer to a pump 100 with vane 1. Nevertheless, the siren noise rotary pumps is known to result, more generally, movable elements integral with the rotor 5 when these elements have a constant angular distribution. Thus, to reduce this noise, the embodiments described above are applicable not only to the vane pumps 1, but also to pumps having similar structures, namely radial movable elements integral with the rotor 5. The angular offset of mobile elements of a rotor 5, according to the scrambler sequence scrambling method, via the application of a pseudo-random binary sequence PRBS, is particularly applicable to the following rotary pumps: radial piston pumps, by applying the shift method angular proposed to the pistons of these pumps;

screw pumps, by applying the angular offset method proposed at the screw thread of these pumps, so as to modify the pitch of screws at each turn of the screw;

centrifugal pumps, by applying the proposed angular offset method to the vanes of these pumps;

peristaltic pumps, by applying the proposed angular offset method to the rollers of these pumps;

gear pumps with internal teeth, by applying the proposed angular offset method to the integral teeth of the rotor 5.

Advantageously, the angular disposition of pallets 1 proposed below is applicable to any pump 100 with pallets 1 embedded in a motor vehicle. By way of nonlimiting examples, the pump 100 to pallets 1 previously described is a:

- Oil pump constituting the lubrication system of a heat engine, allowing the oil supply of the crankshaft, as well as the various elements of the engine;

fuel pump for transporting fuel from an internal combustion engine or an internal combustion engine;

hydraulic pump constituting a hydraulic machine for a hybrid vehicle equipped with such a machine. Advantageously, the embodiments proposed above make it possible both to reduce the siren noise of the rotary pumps and to approach the coloration of the engine noise of a vehicle, such as a heat engine. Thus, for the driver and the passengers of a vehicle, the noise of a pump 100 with pallets 1 merges with the noise of the engine. This is particularly advantageous for car manufacturers: it is thus possible to raise the overall noise threshold of this type of pump, without disturbing the occupants of the vehicle. Indeed, the acoustic energy, while remaining constant, is spread over a wider range of frequencies.

Advantageously, the embodiments described above, allow car manufacturers, to reduce the constraints of acoustic criteria rotary pumps with mobile radial elements, thus allowing suppliers of this type of pumps to optimize their performance, as well as the associated achievement costs.

Claims

A vane pump (100) comprising a stator (2), a suction port (3) and a fluid delivery port (4) made through the stator (2), respectively allowing suction and the delivery of a fluid through the pump (100), a rotor (5) eccentric to and rotatable about the stator (2), each pallet (1) having an angular offset with respect to a theoretical position for which this pallet (1) would present, with all the other pallets (1) of the pump (100), a regular angular distribution with respect to a center, characterized in that the angular offset of the pallets (1) follows a pseudo-random bit sequence, a "1" or "0" bit of this sequence respectively corresponding to an angular offset of a pallet (1) in a first direction of rotation or in a second direction of rotation opposite to the first direction of rotation, this binary sequence being calculated via a scrambler sequence scrambling method, this method being an additive method applying a PRBS pseudo-random bit sequence.

The vane pump (100) according to claim 1, wherein the "1" and "0" bits of the pseudo-random binary sequence PRBS define a range of angular offset range for the pallets (1). -

3. pump (100) vane (1) according to claim 2, wherein the limit extent of the angular offset range of the pallets (1) is determined according to an unbalance induced by the pallets (1).

4. Pump (100) with pallets (1) according to claim 3, comprising seven pallets (1), each pallet (1) having an angular offset in the following bit sequence: 1; 0; 0; 1; 0; 1; 1.

The vane pump (100) according to claim 4, wherein the extent of the angular offset range of the pallets (1) is at least

5 °.

6. Pump (100) with pallets (1) according to any one of claims 1 to 3, comprising one to eight pallets (1), these pallets (1) being angularly offset in a pseudo-random binary sequence PRBS 2 ³ , this sequence comprising respectively the same number of bits as pallets (1).

The vane pump (100) (1) according to any one of claims 1 to 3, comprising n. pallets (1), with n> 8, these pallets (1) being angularly shifted in pseudo-random binary sequence PRBS 2 ^k , with 2 ^{k "} + 1≤n≤2 ^k and an integer k> 3, the pseudo-binary sequence random pattern comprising respectively the same number of bits as pallets (1).

8. pump (100) vane (1) according to any one of claims 1 to 7, this pump (100) being an oil pump constituting a lubrication system.

9. A motor vehicle, comprising a vane pump (100) (1) according to any one of claims 1 to 8.