DE102014207329A1 - Fluidic displacement machine - Google Patents

Abstract

The invention relates to a fluidic displacement machine (11, 12) with displacer cross sections (50) arranged on a circle, to which Umsteuerquerschnitte (55) are assigned, which allow the passage of fluid between one of the Verdrängerquerschnitte (50) and the associated Umsteuerquerschnitt (55).
In order to reduce tonality, the Umsteuerquerschnitte (55) in a defined random pattern relative to the Verdrängerquerschnitten (50) in the circumferential direction is not arranged periodically offset so that a tonality in the operation of the Verdrängermaschine (11, 12) effectively reduced at a relatively small range of variation becomes.

Description

The invention relates to a fluid displacement machine with arranged on a circle Verdrängerquerschnitten which Umsteuerquerschnitte are assigned, which allow the passage of fluid between one of the Verdrängerquerschnitte and the associated Umsteuerquerschnitt. The invention further relates to a method for designing and / or manufacturing such a displacement machine. The invention further relates to a hydraulic hybrid powertrain having an internal combustion engine and at least one fluid displacement machine described above.

State of the art

From the German patent DE 196 41 779 C1 a hydraulic working machine with a housing is known, which defines an interior, into which a stationary control body protrudes, which has separate and connected to a supply or drain port channels, with a rotatably mounted on the control body and coupled to a shaft rotor, in the cylinder-forming recesses are arranged therein with slidably guided lifting elements, and with a rotor annularly surrounding lifting device on which the lifting elements are supported with their ends facing away from the control body ends, wherein the cylinder-forming recesses of the rotor between them include different sized angle segments. From the German disclosure documents DE 10 2006 037 593 A1 and DE 10 2006 041 395 A1 Various measures are known to reduce unwanted propagation of structure-borne noise in axial piston machines. From the U.S. Patent 5,335,83888 For example, an axial piston pump with cylinder outputs is known whose leading edges are randomly disposed relative to an imaginary axis. From the Japanese publication JP 2004 116 455 A For example, a radial piston machine is known in which cylinder bores and cylinder side exits in the circumferential direction are arranged at unequal intervals to improve tonality.

Disclosure of the invention

The object of the invention is to reduce the tonality in the operation of a fluid displacement machine with arranged on a circle Verdrängerquerschnitten which Umsteuerquerschnitte are assigned, which allow the passage of fluid between one of the Verdrängerquerschnitte and the associated Umsteuerquerschnitt.

The problem is solved in a fluid displacement machine with arranged on a circle Verdrängerquerschnitten which Umsteuerquerschnitte are assigned, which allow the passage of fluid between one of the Verdrängerquerschnitte and the associated Umsteuerquerschnitt, achieved in that the Umsteuerquerschnitte in a defined random pattern relative to the Verdrängerquerschnitten in the circumferential direction arranged non-periodically staggered so that a tonality is effectively reduced in the operation of the displacement machine with a relatively small variation width. The Umsteuerquerschnitte and Verdrängerquerschnitte are preferably arranged on the same circle. The displacer cross sections preferably have a circular cross section, the center of which lies on the circle. The Umsteuerquerschnitte preferably have a substantially kidney-shaped shape and provide passageways for the fluid. Because of their kidney-shaped shape, these channels are also referred to as kidneys. Each displacer cross-section is preferably associated with exactly one Umsteuerquerschnitt. The term circumferential direction refers to the previously mentioned circle whose center preferably coincides with a rotation axis of the fluid displacement machine. The variation width is the distance or the delta between a minimum and a maximum offset in the circumferential direction. The term tonality stands for a relation of all tones to a fundamental tone. By virtue of the staggered arrangement of the Umsteuerquerschnitte in the defined random pattern relative to the Verdrängerquerschnitten a flat, noise-like noise spectrum can be achieved during operation of the fluid displacement machine, which is already effective at low harmonics. In this case, particularly advantageous undesirable effects, such as an increase in the modulation, can be avoided. According to a particularly preferred embodiment, the fluidic displacement machine is designed as an axial piston machine, as described for example in German Offenlegungsschriften DE 10 2006 037 593 A1 and DE 10 2006 041 359 A1 is disclosed. In investigations and experiments carried out in the context of the present invention, very good results were achieved in axial piston machines with the staggered arrangement according to the invention of the Umsteuerquerschnitte in the defined random pattern relative to the Verdrängerquerschnitten.

A preferred embodiment of the fluid displacement machine is characterized in that the defined random pattern has a maximum variation width of 6 degrees. This means that the staggered arrangement can have an angular extent of plus / minus 3 degrees in the circumferential direction. Due to this very small variation width unfavorable effects of the staggered arrangement of Umsteuerquerschnitte can be limited to the function and life of the positive displacement machine. So can with the defined Random patterns, for example, maintain sufficient stability of the engine dynamics. Furthermore, unwanted cylinder lifting can be avoided. In addition, low-frequency torsional vibrations of a drive shaft or an output shaft of the fluid displacement machine are avoided. The danger of cavitation can also be kept low. Particularly preferred in the context of the present invention, an offset of plus / minus 2 degrees, in particular of plus / minus 1.5 degrees, in the circumferential direction. This corresponds to a variation of 4 degrees, in particular 3 degrees.

Another preferred embodiment of the fluid displacement machine is characterized in that both in a positive and in a negative direction at least two Verdrängerquerschnitte are offset by more than half of a maximum Winkellagsatzbetrages. For example, the positive direction is defined as the clockwise direction. Then the counterclockwise direction is defined as the negative direction. The maximum angular offset is the maximum angular extent of the offset in the circumferential direction from a central position. The angular offset amount is understood to mean the absolute value of the angular offset in the mathematical sense. In displacement machines with only five displacers and an offset delta which is greater than 5 degrees, it is sufficient if at least two displacers in positive and a negative displacement in the negative direction by more than half of the maximum angular displacement amount from the center position, or vice versa. The offset delta is the difference between a maximum angular offset and a minimum angular offset.

Another preferred embodiment of the fluid displacement machine is characterized in that, within a direct sequence of three displacers, two displacers have the same sign and an angular displacement amount greater than half the angular displacement amount, the third displacer having a different sign or angular displacement amount is less than half the angular displacement amount.

A further preferred embodiment of the fluid displacement machine is characterized in that, within a direct sequence of four displacements, at least two displacers have different signs and an angular offset amount that is greater than half the angular offset amount. With this subsequence, very good results were achieved in investigations carried out in the context of the present invention on fluid displacement machines with more than four displacers.

Another preferred embodiment of the fluid displacement machine is characterized in that the displacement machine comprises five displacers having one of the following offset sequences times the maximum angular displacement amount: [-1, 1, -1, 1, 0], [-1, 0.5, -0.5, 1, 0], [0, -0.5, 0, 1, 0.5]. The square brackets indicate numbers without dimensions. The five numbers separated by commas are assigned to the individual displacers. The number minus 1 stands, for example, for a maximum negative angular offset. Analogously, the number plus 1 stands for a maximum angular offset in the positive direction. The number zero stands for no angular offset. The number 0.5 represents a fifty percent angular offset with respect to the maximum angular displacement amount. The numbers in square brackets are called offset sequences.

Another preferred embodiment of the fluid displacement machine is characterized in that the displacement machine has seven displacers with an offset sequence [0.2, -1, 0.25, 1, -0.4, -1, 1] times the maximum angular offset amount. The number 0.2 represents a twenty percent angular offset. Likewise, the numbers 0.25 and 0.4 represent twenty-five percent and forty percent angular misalignment. The positive or negative signs represent an offset direction in the counterclockwise or clockwise direction.

Another preferred embodiment of the fluid displacement machine is characterized in that the displacement machine has nine to eleven displacers with an offset sequence [-1, 0.6, 1, -1, 0.6, -1] as a subsequence times the maximum angular offset amount. The value 0.6 means a sixty percent angular misalignment.

Another preferred embodiment of the fluid displacement machine is characterized in that the displacement machine comprises nine displacers having one of the following offset sequences times the maximum angular offset amount: [0.6, -1, -1, 1, 1, -1, 0.6, -1, 1] , [1, 0, -1, 0.4, 1, -0.2, 0.2, -1, -1], [1, 0, -1, 1, -0.5, 0.8, -1, 0.5, -1]. Thus, good results could be achieved in the investigations and experiments carried out in the context of the present invention.

Another preferred embodiment of the fluid displacement machine is characterized in that the displacement machine comprises eleven displacers having one of the following offset sequences times the maximum angular displacement amount: [1, -1, 0, 1, -1, -1, 1, 1, -1, 1, -1], [-1, 1, 1, 1, -1, -1, 1, 1, -1, 1, -1], [0, 1, 1, -1, 0, -1, 1, 1, -1, 0.6, -1]. Thus, good results could be achieved in the investigations and experiments carried out in the context of the present invention.

Further preferred embodiments of the fluidic displacement machine are characterized in that the displacement machine has at least one of the aforementioned offset sequences or partial sequences in reverse or mirror-image order. The term mirror image refers to displacements about the central axis or central position.

Another preferred embodiment of the fluid displacement machine is characterized in that a deviation of plus / minus half the angular displacement amount is allowed. As a result, the previously described offset sequences are practically extended by half the half angular offset amount.

In a method for laying out and / or producing a fluid displacement machine with arranged on a circle Verdrängerquerschnitten, which Umsteuerquerschnitte are assigned, which allow the passage of fluid between one of the Verdrängerquerschnitte and the associated Umsteuerquerschnitt, in particular a previously described fluidic Verdrängermaschine, is the above Object alternatively or additionally achieved in that the Umsteuerquerschnitte are not periodically offset in a defined random pattern relative to the Verdrängerquerschnitten in the circumferential direction so that a tonality in the operation of the displacement machine is effectively reduced at a relatively small range of variation. Depending on the number, the previously described offset sequences are used. With a larger number of displacements, one of the offset sequences described above can also be used as a subsequence.

A preferred embodiment of the method is characterized in that, for a displacement machine having a number N equal to two high n minus 1 displacers, a maximum sequence is used to represent the defined random pattern. A maximum sequence or sequence of maximum length is also referred to in English as the Maximum Length Sequence. This is a pseudo-random, binary sequence, which is used in the context of the present invention for representing the defined random pattern.

A further preferred embodiment of the method is characterized in that for a displacement machine with a number of N not equal to two high n minus 1 displacers, a maximum sequence is used as a subsequence for representing the defined random pattern. Thus, good results could be achieved in the investigations and experiments carried out in the context of the present invention.

The invention further relates to a hydraulic hybrid powertrain having an internal combustion engine and at least one fluid displacement machine described above, which has been designed and / or manufactured in particular according to a previously described method. The inventive measures, the tonality of the fluid displacement machine can be particularly advantageous approached to the noise characteristics of an internal combustion engine. As a result, undesired noise development by the displacement machine during operation of the hydraulic hybrid drive train can be reduced or completely prevented.

Further advantages, features and details of the invention will become apparent from the following description in which, with reference to the drawings, various embodiments are described in detail.

Short description of the drawing

Show it:

1 a simplified representation of a hydraulic hybrid powertrain of a motor vehicle with a fluid displacement machine according to the invention;

2 a cross section through the fluid displacement machine according to the invention;

3 a Cartesian coordinate diagram with a sound pressure level profile of a hydrostat with new displacers represented as order spectrum;

4 a Cartesian coordinate diagram in which three offset sequences are plotted for five displacers;

5 a similar representation as in Figure four with an offset sequence for seven displacers;

6 a plot of three offset sequences for nine displacers;

7 a graphical representation of three displacement sequences for eleven displacer and

8th a graphical representation of an offset sequence for seven displacer.

Description of the embodiments

In the enclosed 1 is a hydraulic hybrid powertrain 1 a motor vehicle with a driven wheel 2 shown in simplified form. The driven wheel 2 is about one for example differential 3 drivingly to the hydraulic hybrid powertrain 1 tethered. The hydraulic hybrid powertrain 1 includes a primary drive 4 , for example, an internal combustion engine 6 has, which is also referred to as an internal combustion engine. The wheel 2 can alone by the primary drive 4 are driven.

The hydraulic hybrid powertrain 1 further includes a secondary drive 10 , The secondary drive 10 includes a first hydraulic machine 11 and a second hydraulic machine 12 , The two hydraulic machines 11 and 12 are hydraulically input side with a low pressure side 13 connected. The low pressure side 13 includes a low pressure accumulator 14 with hydraulic medium, which is subjected to low pressure.

On the output side are the hydraulic machines 11 and 12 hydraulically with a high pressure side 16 connected. The high pressure side 16 includes a high pressure accumulator 17 with hydraulic medium, which is subjected to high pressure.

Through a total of six rectangles 18 are valve means referred to in a known manner the operation of the secondary drive 10 with the two hydraulic machines 11 and 12 enable.

A gearbox 20 is between the primary drive 4 and the secondary drive 10 connected. The gear 20 is as a planetary gear with a ring gear 30 a sun wheel 32 and planet wheels 34 executed. The planet wheels 34 are at a planet carrier 35 rotatably mounted.

A first wave 21 is rotatably connected via a gear stage with the planet carrier 35 connected. The first wave 21 is at her in the 1 right end over another gear stage rotation with the differential 3 connected.

A second wave 22 is non-rotatable with the ring gear 30 of the planetary gear 20 connected. The second wave 22 is driving with the primary drive 4 connectable. A third wave 23 is rotatable with the sun gear 32 of the planetary gear 20 connected.

A coupling and / or synchronizer 27 is drivingly between the second hydraulic machine on the output side 12 of the secondary drive 10 and the differential 3 with the driven wheel 2 connected. In this case, to represent additional functions, such as a reverse gear, further gear stages between the clutch and / or synchronizer 27 and the differential 3 be switched.

In the hydraulic hybrid powertrain 1 it is a mechanical-hydraulic power-split drive train. Depending on the operating point, the power of the hydraulic hybrid drivetrain 1 via the also called mechanical drive primary drive 4 or via the secondary drive, also referred to as a hydraulic drive 10 be guided. In addition, the power can also simultaneously through the two drives 4 . 10 or system branches are performed. Operating states can occur in which individual system parts are inactive or have to be deactivated.

In the 1 only symbolically represented hydraulic machines 11 and 12 are also referred to as Hydrostaten and are preferably designed as axial piston machines. The structure and function of axial piston machines are described, for example, in the German Offenlegungsschrift in DE 10 2006 037 593 A1 and DE 10 2006 041 359 A1 described.

In 2 is a designed as an axial piston hydrostat in a cross section through a cylinder 40 shown. The cylinder 40 comprises a total of nine piston bores 41 to 49 which serve to guide pistons (not shown) in the axial direction. The axial direction runs in 2 perpendicular to the drawing plane.

Every piston bore 41 to 49 represents a circular displacement cross section 50 dar. The centers of the circular Verdrängerquerschnitte 50 are on a circle 52 arranged and spaced uniformly in the circumferential direction. Each displacement cross section 50 is a reversal kid 53 associated, which allows a passage of fluid from a suction area in the respectively associated piston bore or from the respective associated piston bore in a pressure range of the displacement machine.

Half of the Umsteuerquerschnitte 55 and displacer cross sections 50 is assigned to the print area, which is also referred to as print kidney. The other half of Umsteuerquerschnitte 55 and displacer cross sections 50 is assigned to the suction area, which is also referred to as Saugniere. The pressure kidney and the suction kidney are provided, for example, in a stationary control plate (not shown).

In 2 is by an arrow 56 hinted that the cylinder 40 rotates clockwise during operation of the positive displacement machine. By a double arrow 57 is a pitch angle between the piston bores 41 and 42 designated. The pitch angle between the piston bores 41 to 49 are equal. Due to the cylinder rotation, the displacer 50 over the Umsteuerquerschnitte 55 alternately commutated with the pressure or suction kidney.

By arrows 58 and 59 in each case an angular offset is indicated by the Umsteuerquerschnitte 55 according to an essential aspect of the invention relative to the respectively associated displacement cross-section 50 offset in the circumferential direction. The staggered arrangement of Umsteuerquerschnitte 55 relative to the Verdrängerquerschnitten 50 becomes due to the substantially kidney-shaped shape of Umsteuerquerschnitte 55 Also referred to in the English as "kidney-shifting". The relative offset of Umsteuerquerschnitte 55 in a defined random pattern produces a temporally non-periodic commutation to the pressure or suction kidney.

The Umsteuerquerschnitte 55 can from their indicated by a dotted line center position 60 either clockwise, as indicated by the arrow 59 in 2 is indicated, or counterclockwise, as indicated by the arrow 58 in 2 is indicated, offset in the circumferential direction.

The staggered arrangement of Umsteuerquerschnitte relative to the Verdrängerquerschnitten is carried out according to an essential aspect of the invention so that a tonality in the operation of the displacement machine is reduced. In 3 For example, in a Cartesian coordinate diagram on an x-axis, hydrostatics are plotted in integers from 0 to 99. The term order refers to the multiple of the rotation frequency. On the y-axis is in 3 a sound pressure level is plotted in decibels. The y-axis is divided into levels of five decibels.

Through dotted lines 63 with a point 64 in the end are in 3 Reference values shown without kidney-shifting. In comparison, there is a sound pressure level profile 65 shown with kidney-shifting. Without kidney-shifting, the Umsteuerquerschnitte are evenly distributed periodically. In 3 you see that without kidney-shifting only the multiples of the basic order occur, which is determined by the number of displacers. In the example shown, the tested fluidic displacement machine has nine displacers.

As a displacer, for example, the axially movable piston of the axial piston machine are referred to. Already by a small variation of the division of Umsteuerquerschnitte by a few degrees, as can be seen in 3 sees the twenty-seventh order reduced by three, the thirty-sixth order by five decibels. From the forty-fifth order, the piston frequencies are of the same order of magnitude as the minor harmonics. This comes very close to a noise-like spectrum, so that the tonality, in particular when superimposed with other noise sources, for example an internal combustion engine or an internal combustion engine, is noticeably less noticeable and thus more pleasant.

The kidney-shifting is used in the present invention to generate a defined random pattern, as the Umsteuerquerschnitte particularly advantageous relative to the Verdrängerquerschnitten in the circumferential direction can not be arranged periodically offset so that a tonality in the operation of Verdrängermaschine with a relatively small range of variation effectively reduced. Such a random pattern is also called a kidney-shifting pattern. In the following, the nomenclature for the following general rules and special, advantageous consequences of the optimization according to the invention is explained.

Nomenclature:

• N single events within one period (equal to number of displacers)
• Δτ pitch angle Angle between two piston bores evenly distributed (360 ° / N)
• γ _i KS kidney-shifting angle (displacement of the cylinder kidney from the middle position opposite to the direction of rotation with respect to the piston bore)
• γ _min , γ _max KS limit Lower or upper limit of the largest occurring KS angle
• Δγ = γ _max - γ _min KS-wide upper KS boundary minus lower KS boundary

General specifications:

• • The center position is set so that γ _min = -γ _max . Usually, the middle position coincides with the bore axis.
• • Due to the periodicity, the pattern can be continued after the last displacer at the first: γ _i = γ _{N + i} for i = 1 ... N)
• • It is understood that the patterns or subsequences described also in reverse order (ie γ * / i = γ _{N-i + 1} for i = 1 ... N) and in a mirror-image arrangement of the displacements about the central axis ( γ * / i = -γ _i for i = 1 ... N) without any disadvantages in terms of effectiveness. For a description of the corresponding modified sample variants γ * / i to the original arrangement is therefore omitted.
• • Robustness studies have shown that the pattern sequences still show good to very good efficacy even in case of deviations. Therefore, variants within a certain tolerance deviation are included in the sample sequences according to the invention, without to leave the scope of the invention. There may be individual deviations of γ * / i = γ _i ± 0.5γ _max and a mean deviation of
  
  be admitted within the set (partial) sequence without reducing the effectiveness of the invention.

General Rules for the Beneficial Embodiments of Kidney Shifting

• 1. Of all displacers, the displacements are selected so that both in pos. as well as in neg. Direction ever mind. 2 displacer by more than half of the max. KS amount deviate from the middle position. The position and order of i, j, k, l within the overall sequence is irrelevant. → γ _{i, j} > 0.5γ _max and γ _{k, l} <0.5γ _min . For units with only 5 displacers and Δγ> 5 °, it is sufficient if at least 2 displacers i, j in pos., And a displacer k in neg. Direction by more than half of the max. KS amount deviates from the middle position (or vice versa). → γ _{i, j} > 0.5γ _max and γ _k <0.5γ _min
• 2. If, within a direct sequence of 3 displacers i, j, k, the following constellation is chosen: 2 displacers i, j with the same sign and large amplitude, the third displacer k must have a small amplitude or a different sign. The order of i, j, k within the 3-series is irrelevant. → for γ _{i, j} > 0.5γ _max must be valid γ _k <0.5γ _max
• 3. Within a direct sequence of 4 displacers i, j, k, l, at least one displacer γ _i > 0.5γ _max and for at least one displacer γ _j <0.5γ _min . Ie. there must be at least two displacers i and j with large amplitude and different sign. The order of i, j, k, l within the 4-series is irrelevant.

Special, beneficial consequences (from the optimization):

• 4. For N = 5: The sequence is γ _max * [-1, 1, -1, 1, 0], where a deviation of ± 0.5γ _{max is} still within the scope of the invention for each γ _i .
• 5. For N = 5: the sequence is γ _max * [-1, 0.5, -0.5, 1, 0], wherein for each γ _i a deviation of ± 0.5γ _{max is} still within the scope of the invention.
• 6. For N = 5: the sequence is γ _max * [0, -0.5, 0, 1, 0.5], whereby for every γ _i a deviation of ± 0.5γ _{max is} still within the scope of the invention.
• 7. For N = 7: The sequence is γ _max * [0.2, -1, 0.25, 1, -0.4, -1, 1], where for each γ _i a deviation of ± 0.5γ _{max is} still within the scope of the invention lies. Especially for γ ₃ , the robustness test showed a particularly wide tolerance field with γ ₃ = (0.25 ± 0.7) γ _max .
• For N = 9-11: The sequence contains a subsequence γ _max * [-1, 0.6, 1, -1, 0.6, -1], wherein for each γ _i a deviation of ± 0.5γ _{max is} still within the scope of the invention lies.
• 9. For N = 9: The sequence is γ _max * [0.6, -1, -1, 1, 1, -1, 0.6, -1, 1], where for each γ _i a deviation of ± 0.5γ _max still within the scope of the invention.
• 10. For N = 9: The sequence is γ _max * [1, 0, -1, 0.4, 1, -0.2, 0.2, -1, -1], where for each γ _i a deviation of ± 0.5γ _max still within the scope of the invention.
• 11. For N = 9: The sequence is γ _max * [1, 0, -1, 1, -0.5, 0.8, -1, 0.5, -1], where for each γ _i a deviation of ± 0.5γ _{max still within the scope of the invention.}
• 12. For N = 11: The sequence is γ _max * [1, -1, 0, 1, -1, -1, 1, 1, -1, 1, -1], where for each γ _i a deviation of ± 0.5γ _{max is} still within the scope of the invention.
• 13. For N = 11: The sequence is γ _max * [- 1, 1, 1, 1, -1, -1, 1, 1, -1, 1, -1], where for each γ _i a deviation of ± 0.5γ _{max is} still within the scope of the invention.
• 14. For N = 11: The sequence is γ _max * [0, 1, 1, -1, 0, -1, 1, 1, -1, 0.6, -1], where for each γ _i a deviation of ± 0.5γ _{max is} still within the scope of the invention.
• 15. Using one of the o. G. Sequences as subsequences in applications with larger numbers N.
• 16. Using a maximum length sequence as a consequence in hydrostatic applications with a number of displacers N = 2 ⁿ -1. In particular, for N = 7, the sequence γ _max * [1, -1, -1, 1, -1, 1, 1].
• 17. Using a maximum length sequence as a subsequence in applications with a larger number N for N ≠ 2 ⁿ - 1.

In the 3 to 8th For example, in addition to general rules 4 through 7, 9 through 14, and 16 described above, the associated sequences, also referred to as offset sequences, are graphically represented using Cartesian coordinate diagrams.

The displacer numbers are plotted on the x-axis of the coordinate diagrams. On the y-axis of the coordinate diagrams, the offset or the kidney-shifting is dimensionlessly plotted. Where plus is one for a maximum positive offset and minus one for a maximum negative offset. The zero means that no offset or no kidney-shifting occurs.

In 4 are consequences 74 to 76 to the general rules 4 to 6 for a displacement machine with five displacers graphed.

In 5 is an offset sequence 77 to the general rule 7 with seven pistons or displacers graphed.

In 6 are offset sequences 79 to 81 to the rules 9 to 11 for a displacer with nine displacers graphed.

In 7 are offset sequences 82 to 84 to the general rules 12 to 14 for a displacer with eleven pistons plotted.

In 8th is an offset sequence 85 to rule 16 for a displacement machine with seven displacers graphed.

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 19641779 C1 [0002]
• DE 102006037593 A1 [0002, 0004, 0039]
• DE 102006041395 A1 [0002]
• US 5358388 [0002]
• JP 2004116455 A [0002]
• DE 102006041359 A1 [0004, 0039]

Claims (17)

Fluidic displacement machine ( 11 . 12 ) with on a circle ( 52 ) arranged Verdrängerquerschnitten ( 50 ), which Umsteuerquerschnitte ( 55 ), the passage of fluid between one of the Verdrängerquerschnitte and the associated Umsteuerquerschnitt ( 55 ), characterized in that the Umsteuerquerschnitte ( 55 ) in a defined random pattern relative to the Verdrängerquerschnitten ( 50 ) are non-periodically offset in the circumferential direction so that a tonality in the operation of the displacement machine ( 11 . 12 ) is effectively reduced with a relatively small variation width. Fluidic displacement machine ( 11 . 12 ) according to claim 1, characterized in that the defined random pattern has a maximum variation width of 6 degrees. Fluidic displacement machine ( 11 . 12 ) according to one of the preceding claims, characterized in that both in a positive and in a negative direction in each case at least two Verdrängerquerschnitte ( 50 ) are staggered by more than one half of a maximum angular displacement amount. Fluidic displacement machine ( 11 . 12 ) according to any one of the preceding claims, characterized in that, within a direct sequence of three displacers, two displacers have the same sign and an angular displacement amount greater than half the angular displacement amount, the third displacer having a different sign or angular displacement amount which is smaller is the half angle offset amount. Fluidic displacement machine ( 11 . 12 ) according to one of the preceding claims, characterized in that, within a direct sequence of four displacements, at least two displacers have different signs and an angular offset amount which is greater than half the angular offset amount. Fluidic displacement machine ( 11 . 12 ) according to one of the preceding claims, characterized in that the displacement machine ( 11 . 12 ) has five displacers with one of the following offset sequences times the maximum angular offset amount: [-1, 1, -1, 1, 0], [-1, 0.5, -0.5, 1, 0], [0, -0.5, 0, 1, 0.5]. Fluidic displacement machine ( 11 . 12 ) according to one of the preceding claims, characterized in that the displacement machine ( 11 . 12 ) has seven displacers with an offset sequence [0.2, -1, 0.25, 1, -0.4, -1, 1] times the maximum angular offset amount. Fluidic displacement machine ( 11 . 12 ) according to one of the preceding claims, characterized in that the displacement machine ( 11 . 12 ) has nine to eleven displacers with a subsequence [-1, 0.6, 1, -1, 0.6, -1] times the maximum angular offset amount. Fluidic displacement machine ( 11 . 12 ) according to one of the preceding claims, characterized in that the displacement machine ( 11 . 12 ) comprises nine displacers having one of the following offset sequences times the maximum angular offset amount: [0.6, -1, -1, 1, 1, -1, 0.6, -1, 1], [1, 0, -1, 0.4, 1, -0.2, 0.2, -1, -1], [1, 0, -1, 1, -0.5, 0.8, -1, 0.5, -1]. Fluidic displacement machine ( 11 . 12 ) according to one of the preceding claims, characterized in that the displacement machine ( 11 . 12 ) has eleven displacers with one of the following offset sequences times the maximum angular offset amount: [1, -1, 0, 1, -1, -1, 1, 1, -1, 1, -1], [-1, 1, 1 , 1, -1, -1, 1, 1, -1, 1, -1], [0, 1, 1, -1, 0, -1, 1, 1, 1, 0.6, -1]. Fluidic displacement machine ( 11 . 12 ) according to one of the preceding claims, characterized in that the displacement machine ( 11 . 12 ) has at least one of the aforementioned offset sequences or partial sequences in reverse order. Fluidic displacement machine ( 11 . 12 ) according to one of the preceding claims, characterized in that the displacement machine ( 11 . 12 ) has at least one of the aforementioned offset sequences or partial sequences with the opposite sign. fluidic Positive displacement machine ( 11 . 12 ) according to one of the preceding claims, characterized in that a deviation of plus / minus half the angular displacement amount is permitted. Method for laying out and / or producing a fluid displacement machine ( 11 . 12 ) with arranged on a circle Verdrängerquerschnitten ( 50 ), which Umsteuerquerschnitte ( 55 ), the passage of fluid between one of the Verdrängerquerschnitte ( 50 ) and the associated Umsteuerquerschnitt ( 55 ), in particular a fluidic displacement machine ( 11 . 12 ) according to one of the preceding claims, characterized in that the Umsteuerquerschnitte ( 55 ) in a defined random pattern relative to the Verdrängerquerschnitten ( 50 ) in the circumferential direction are not periodically offset so arranged that a tonality in the operation of the displacement machine ( 11 . 12 ) is effectively reduced with a relatively small variation width. Method according to claim 14, characterized in that for a displacement machine ( 11 . 12 ) with a number N equal to two high n minus 1 displacers, a maximum sequence is used to represent the defined random pattern. Method according to claim 14, characterized in that for a displacement machine ( 11 . 12 ) with a number of N not equal to two high n minus 1 displacers a maximum sequence is used as a subsequence for representing the defined random pattern. Hydraulic hybrid powertrain with an internal combustion engine ( 6 ) and at least one fluid displacement machine ( 11 . 12 ) according to one of claims 1 to 13, which has been designed and / or manufactured in particular according to a method according to one of claims 14 to 16.

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