DE102013212148A1 - Swash plate machine - Google Patents

Abstract

Swashplate machine (1) as axial piston pump (2) and / or axial piston motor (3), comprising a cylinder drum (5) rotatably or rotationally mounted about an axis of rotation (8) with piston bores (6), pistons movably mounted in the piston bores (6) ( 7), one with the cylinder drum (5) at least rotatably connected drive shaft (9) which is rotatably or rotatably mounted about the rotation axis (8), a about a pivot axis (15) pivotally mounted pivoting cradle (14) with a support surface (18 ), Sliding shoes (39) which are each connected to a piston connection point (22) with a respective piston (7), for the indirect mounting of the pistons (7) on the support surface (18) of the pivoting cradle (14), a retaining disc (37) with a disc opening for connection of the sliding shoes (39) and for the permanent direct or indirect contact of the sliding shoes (39) with the support surface (18), at least one retaining clip (17) which on the retaining disc (37) mi ttelbar or directly rests, for applying a retaining force on the retaining disc (37), a weighing storage (20) for the pivoting cradle (14), at least one pivoting device (24) for pivoting the pivoting cradle (14), a low-pressure opening for on and / or Discharging hydraulic fluid into and / or out of the rotating piston bores (6), a high pressure port for discharging hydraulic fluid from and / or into the rotating piston bores (6), the at least one retaining clip (17), in particular exclusively, on a radial inner end portion (23) on the disc opening (38) on the retaining disc (37) rests.

Description

The present invention relates to a swashplate machine according to the preamble of claim 1 and a drive train according to the preamble of claim 9.

State of the art

Swash plate machines serve as axial piston pumps for converting mechanical energy into hydraulic energy and as axial piston motor for converting hydraulic energy into mechanical energy. A cylinder drum with piston bores is rotatably or rotatably mounted and pistons are arranged in the piston bores. The cylinder drum is fixedly connected to a drive shaft and a hydraulic fluid acts temporarily on a first part of the rotating piston bores under high pressure and a hydraulic fluid acts temporarily on a second part of the rotating piston bores at low pressure. A pivoting cradle is pivotally mounted about a pivot axis and on the pivoting cradle is on a retaining disc with sliding shoes. The pistons are attached to the sliding shoes. The retaining disc with the sliding shoes together with the cylinder drum performs a rotational movement about an axis of rotation and a flat bearing surface of the pivoting cradle is at an acute angle, for example between 0 ° and + 20 ° and between 0 ° and -20 ° as a swivel angle aligned with the axis of rotation of the cylinder drum. The sliding blocks are mounted with a sliding bearing, which is generally hydrostatically relieved, on the support surface of the pivoting cradle and the sliding blocks are connected to the retaining disc. The pivoting cradle is pivoted by two hydraulic pivoting devices, each of which is formed by an adjusting piston and an adjusting cylinder, about a pivot axis. In an operation of the swash plate machine as an axial piston pump, the pistons are pressed at the high pressure port of the hydraulic fluid under high pressure on the support surface of the pivoting cradle. The pistons at the low pressure port act as a suction side of the axial piston pump, so that due to inertial and frictional forces and possibly forces due to a pressure difference between the hydraulic fluid in an enclosed space of the housing and the pressure in the piston bores at the low pressure port or suction side Sliding shoes, which are arranged at the low-pressure opening, the sliding shoes would lift off the support surface of the pivoting cradle, so that no contact between these sliding shoes and the support surface would exist and thus the functioning of the swash plate machine would be limited. So that the sliding shoes constantly rest on the bearing surface of the pivoting cradle, it is known to apply a retaining force with retaining clips on the radially outer end region of the retaining disk and / or with a compression spring. For this purpose, the retaining clips rest on the radially outer end region of the retaining disc. The retaining disc performs a rotational movement, so that at the radial outer end portion of a large tangential velocity of the retaining disc occurs and thus also a large friction between the rotating retaining disc and resting on the retaining disc fixed and immovable retaining clips. Due to the large friction losses occur large energy losses, thereby disadvantageously having the swash plate machine has a lower efficiency.

The EP 1 013 928 A2 shows an axial piston pump in a swash plate design with a driven rotating and a plurality of piston bores arranged therein cylinder barrel, wherein in each separated by webs piston bores are arranged between a bottom dead center and a top dead center movable pistons and a low-pressure connection kidney and a Hochdruck Hochdruck kidney having control disc provided is.

The CH 405 934 shows a Schrägscheibenaxialkolbenpumpe whose non-rotating cylinder block for varying the delivery rate in dependence on the delivery pressure is longitudinally displaceable, wherein on the pressed by a spring in the direction of increasing the delivery cylinder block, a control slide unit is fixed with a spool.

The DE 27 33 870 C2 shows a control device for a Schrägenscheibenaxialkolbenpumpe, in which acts on both sides of the cradle for pivoting the swash plate depending on a hydraulically actuated swing wing on the engine, both motors are controllable by means of a pivot about the pivot axis of the cradle pivotally mounted plate-shaped control valve slide and adjusting the flow rate of the pump serve.

Disclosure of the invention

Advantages of the invention

Swash plate machine according to the invention as axial piston pump and / or axial piston motor, comprising a cylinder drum rotatable about a rotation axis with piston bores, pistons movably mounted in the piston bores, a drive shaft at least rotatably connected to the cylinder drum, which is rotatable about the rotation axis is mounted, a swivel mounted about a pivot axis mounted pivoting cradle with a bearing surface, sliding blocks, which are each connected to a piston connecting point with a piston for indirect storage of the piston on the support surface of the pivoting cradle, a retaining disc with a disc opening for connecting the sliding blocks and the permanent indirect or direct contact of the shoes with the support surface, at least one retaining clip which rests directly or indirectly on the retaining disc, for applying a retaining force on the retaining disc, a weighing storage for the pivoting cradle, at least one pivoting device for pivoting the pivoting cradle, a low pressure opening to a and / or discharge of hydraulic fluid into and / or out of the rotating piston bores, a high-pressure port for discharging and / or introducing hydraulic fluid out of and / or into the rotating piston bores, wherein the at least one retaining clip, in particular exclusively, rests on the retaining disc on a radial inner end region on the disc opening. The at least one retaining clip rests on the retaining disk on the radial inner end region, in particular exclusively, on the disk opening, so that the retaining force is thereby applied to the retaining disk at the radial inner end region with a low tangential velocity of the rotating retaining disk. Due to the low tangential velocity of the retaining disc at the radial inner end region, a small friction loss occurs between the fixed and non-rotating at least one retaining clip and the rotating retaining disc. As a result, the swash plate machine advantageously low mechanical loss, so that thereby the swash plate machine has a high efficiency.

In an additional embodiment, the sliding shoes and the retaining disc are integrally formed and in a further embodiment, the sliding shoes are formed as separate components in addition to the retaining disc.

In particular, the at least one retaining clip is attached to the pivoting cradle with a fastening device, in particular a screw, and / or the restraining force from the at least one retaining clip on the retaining plate without an elastic element, for. As a spring, can be applied and / or between the at least one retaining clip on the retaining surface and the retaining disc a slide bearing is formed. The retaining clip is thus formed as a separate component in addition to the pivoting cradle and attached to the fastening device on the pivoting cradle.

In a further embodiment, the pivoting cradle has an opening and the at least one retaining clip is completely guided through the opening and the at least one retaining clip is fastened with the fastening device to a rear side of the pivoting cradle and / or the pivoting cradle has an opening and the at least one Retaining clip is fastened to the pivoting cradle in the area of the opening. The at least one retaining clip is thus not attached to the outside of the pivoting cradle and thus requires less space.

In a supplementary embodiment, the at least one retaining clip rests on the restraining disk on a side of the retaining disk facing away from the support surface indirectly or directly on the radial inner end region. The retaining disk has a side facing away from the support surface of the pivoting cradle and a side facing the support surface of the pivoting cradle. The at least one retaining clip rests on the opposite side of the retaining disc, so that from the at least one retaining clip a retaining force on the retaining disc can be applied, so that the sliding blocks are in constant indirect contact with the support surface of the pivoting cradle. Preferably, there is a clearance in the range between 10 μm and 15 μm between the sliding shoes and the support surface. This game is required to reduce the friction and compensate manufacturing inaccuracies while ensuring sufficient permanent direct or indirect contact of the shoes with the support surface of the pivoting cradle.

Preferably, the swashplate machine comprises a plurality of retaining clips and / or the radial inner end region of the retaining disc comprises less than 40%, 30%, 20% or 10% of the radial overall extent of the retaining disc. Suitably, the plurality of retaining clips are evenly distributed in the tangential orientation.

In a variant, the retaining disc at the radial inner end region on which rests the at least one retention chamber, with a tribological coating, for. As carbon, brass, PTFE or PEEK, provided to reduce friction. By means of the tribological coating, the friction between the retaining clips and the retaining disc can be substantially reduced.

Suitably, the at least one retaining clip at the area for resting on the retaining disc with a tribological coating, for. As carbon, brass, PTFE or PEEK, provided to reduce friction.

In a further embodiment, the support surface of the pivoting cradle is planar and / or the at least one retaining clip and / or the retaining disc and / or the sliding blocks and / or the support surface of the pivoting cradle, at least partially, in particular completely, of metal, in particular steel or aluminum , educated.

In another embodiment, the retaining clip mounting device is formed as a rivet or weld.

Drive train according to the invention for a motor vehicle, comprising at least one swash plate machine for converting mechanical energy into hydraulic energy and vice versa, at least one pressure accumulator, wherein the swash plate machine is designed as a swash plate machine described in this patent application.

Preferably, the drive train includes two swash plate machines, which are hydraulically connected to each other and act as a hydraulic transmission and / or the drive train comprises two pressure accumulator as high-pressure accumulator and low pressure accumulator.

Brief description of the drawings

Hereinafter, embodiments of the invention will be described in more detail with reference to the accompanying drawings. It shows:

1 a longitudinal section of a swash plate machine,

2 a cross section AA according to 1 a valve disc of the swash plate machine and a view of a pivoting cradle,

3 a partial longitudinal section of the swash plate machine according to 1 in the area of the swivel cradle,

4 a view of a retaining disc of the swash plate machine according to 1 on the side facing away from a cylinder drum and

5 a drive train for a motor vehicle.

Embodiments of the invention

An in 1 in a longitudinal section shown swash plate machine 1 serves as axial piston pump 2 For conversion or conversion of mechanical energy (torque, speed) into hydraulic energy (volume flow, pressure) or as axial piston motor 3 for conversion or conversion of hydraulic energy (volume flow, pressure) into mechanical energy (torque, speed). A drive shaft 9 is by means of a storage 10 on a flange 21 one- or multi-part housing 4 and with another storage 10 on the housing 4 the swash plate machine 1 around a rotation axis 8th rotatably or rotatably mounted ( 1 ). With the drive shaft 9 is a cylinder drum 5 rotationally fixed and connected in the axial direction, wherein the drive shaft 9 and the cylinder drum 5 one or two parts are formed and the boundary between the drive shaft 9 and the cylinder drum 5 in 1 is shown in dashed lines. The cylinder drum 5 guides the rotational movement of the drive shaft 9 with out due to a non-rotatable connection. In the cylinder drum 5 are a variety of piston bores 6 with any cross-section, for example square or circular, incorporated. The longitudinal axes of the piston bores 6 are essentially parallel to the axis of rotation 8th the drive shaft 9 or the cylinder drum 5 aligned. In the piston bores 6 is each a piston 7 movably mounted. A pivoting cradle 14 is about a pivot axis 15 pivotable on the housing 4 stored. The pivot axis 15 is perpendicular to the drawing plane of 1 and parallel to the drawing plane of FIG. 2 aligned. The rotation axis 8th the cylinder drum 5 is parallel to and in the drawing plane of 1 arranged and perpendicular to the drawing plane of 2 , The housing 4 limited liquid-tight an interior 44 which is filled with hydraulic fluid.

The pivoting cradle 14 has a flat or planar support surface 18 for supporting a retaining disc 37 on. The retaining disc 37 is with a variety of sliding shoes 39 provided and every shoe 39 is there with one piston each 7 connected. For this purpose, the sliding shoe 39 a camp ball 40 ( 1 ), which in a Lagerpfanne 59 on the piston 7 is attached, so that a piston joint 22 between the bearing ball 40 and the pan 59 on the piston 7 is trained. The partially spherical bearing ball 40 and pan 59 Both are complementary or spherical, so thereby at a corresponding movement possibility to each other between the bearing ball 40 and the pan 59 to the piston 7 a permanent connection between the piston 7 and the sliding shoe 39 is available. Due to the connection of the pistons 7 with the rotating cylinder drum 5 and the connection of the bearing pans 59 with the sliding shoes 39 lead the sliding shoes 39 a rotational movement about the axis of rotation 8th with out and due to the firm connection or arrangement of the sliding shoes 39 on the retaining disc 37 also carries the retaining disc 37 a rotational movement around the axis of rotation 8th with out. So that the retaining disc 37 in constant indirect contact with the support surface 18 the pivoting cradle 14 stands, this is made of retaining clips 17 with a retention force on the support surface 18 pressed.

The pivoting cradle 14 is - as already mentioned - around the pivot axis 15 pivoted and also has an opening 42 ( 1 ) for carrying out the drive shaft 9 on. At the housing 4 is a weighing storage 20 educated. Here are at the pivoting cradle 14 formed two bearing sections. The two bearing sections of the pivoting cradle 14 lie on the weighing storage 20 on. The pivoting cradle 14 is thus by means of a sliding bearing on the weighing storage 20 or the housing 4 around the pivot axis 15 pivoted. In the illustration in 1 has the bearing surface 18 according to the sectioning in 1 a pivot angle α of approximately + 20 °. The swivel angle α is between a notional plane perpendicular to the axis of rotation 8th and one of the flat bearing surface 18 the pivoting cradle 14 spanned level exists according to the sectional formation in 1 , The pivoting cradle 14 can between two pivotal limit angle α between + 20 ° and -20 ° by means of two pivoting devices 24 be pivoted.

The first and second pivoting device 25 . 26 as pivoting devices 24 has a junction 32 between the pivoting device 24 and the swivel cradle 14 on. The two pivoting devices 24 each have an adjusting piston 29 on, which in an adjusting cylinder 30 is movably mounted. The adjusting piston 29 or an axis of the adjusting cylinder 30 is essentially parallel to the axis of rotation 8th the cylinder drum 5 aligned. At one in 1 left end portion of the adjusting piston shown 29 this has a bearing cup 31 in which a bearing ball 19 is stored. Here is the bearing ball 19 on a swivel arm 16 ( 1 to 3 ) of the pivoting cradle 14 available. The first and second pivoting device 25 . 26 is thus each with a ball bearing 19 on each one swivel arm 16 with the swivel cradle 14 connected. By opening one of the two valves 27 . 28 as the first valve 27 at the first pivoting device 25 and the second valve 28 at the second gift device 26 as shown in 1 can the swivel cradle 14 around the pivot axis 15 be pivoted, as a result of the adjusting piston 29 on the open valve 27 . 28 with a hydraulic fluid under pressure in the adjusting cylinder 30 a force is applied. Not only does the swing cradle lead here 14 but also the retaining disc 37 due to the retention force applied by the retaining clips, this pivotal movement of the pivoting cradle 14 with out.

During operation of the swashplate machine 1 as axial piston pump 2 is at constant speed of the drive shaft 9 that of the swashplate machine 1 the larger the amount of the swivel angle α and the other way around, the greater the volumetric flow delivered. This is due to the in 1 right end of the cylinder drum 5 a valve disc 11 on, with a kidney-shaped high-pressure opening 12 and a kidney-shaped low-pressure opening 13 , The piston bores 6 the rotating cylinder drum 5 thus become fluid conducting in an arrangement at the high pressure port 12 with the high-pressure opening 12 connected and in an arrangement at the low pressure opening 13 with the low-pressure opening 13 fluidly connected. At a swivel angle α of 0 ° and during operation of the swash plate machine 1 for example as axial piston pump 2 is despite a rotational movement of the drive shaft 9 and the cylinder drum 5 no hydraulic fluid from the axial piston pump 2 promoted as the pistons 7 no strokes in the piston bores 6 To run. During operation of the swashplate machine 1 both as axial piston pump 2 as well as axial piston motor 3 have the temporarily in fluid communication with the high pressure port 12 standing piston bores 6 a greater pressure on hydraulic fluid than the piston bores 6 temporarily in fluid communication with the low pressure port 13 stand. An axial end 66 the cylinder drum 5 lies on the valve disc 11 on. On a first page 64 of the housing 4 or the flange 21 of the housing 4 is an opening 63 with storage 10 trained and a second page 65 has a recess for mounting the drive shaft 9 with another storage 10 on.

The pivoting cradle 14 has the opening 42 on, through which the drive shaft 9 is guided and the annular, flat retaining disc 37 has the centric disc opening 38 on, through which the drive shaft 9 is also guided. At the swivel cradle 14 are a total of six retaining clips 17 with one screw each 34 as a fastening device 33 and additionally positively connected (not shown) firmly. Due to the sectional formation in 1 and 3 are only two retaining clips 17 shown. The pivoting cradle 14 has a back 43 on and the back 43 is the to the bearing surface 18 opposite side. The retaining clips 17 are at the back 43 with the fastening devices 33 attached ( 1 and 3 ). The screws 34 are inside a screw hole 35 at the swivel cradle 14 attached. The six retaining clips 17 are thus fixed to the pivoting cradle 14 connected and thereby perform no rotational movement, but only the pivotal movement of the pivoting cradle 14 around the pivot axis 15 , In the retaining disc 37 are holes 36 ( 3 ) educated and in the holes 36 is in each case a sliding shoe 39 arranged. The sliding shoes 39 are thus at the holes 36 positive fit with the retaining disc 37 connected and the sliding shoes 39 lie directly on the support surface 18 the pivoting cradle 14 on. This show the sliding shoes 39 a discharge channel, not shown, so that thereby hydraulic fluid from the discharge channel in the piston 7 also to the bearing surface of the shoes 39 on the support surface 18 the pivoting cradle 14 passes, so that thereby the sliding bearing of the sliding shoes 39 on the support surface 18 the pivoting cradle 14 hydrostatically relieved.

The retaining disc 37 has one to the bearing surface 18 facing side and one to the bearing surface 18 the pivoting cradle 14 opposite side 61 on ( 1 and 3 ). At a radial inner end region 23 as part of the opposite side 61 the retaining disc 37 lie the retaining clips 17 with retention surfaces 41 on. The retaining clips 17 are distributed tangentially evenly, so that the retaining clips 17 tangential evenly distributed on the radially inner end portion 23 rest. The radial extent 62 the radial inner end portion 23 starts at the disc opening 33 and the radial extent 62 the radial end portion 23 is about 20% of the total radial extent 67 the retaining disc 37 ( 4 ). Between the bearing surface of the sliding shoes 39 on the support surface 18 the pivoting cradle 14 There is a clearance of about 10 μm to 15 μm. This is due to the fact that the sum of the thickness of the retaining disc 37 and the part of the sliding shoes 39 between the support surface 18 and the retaining disc 37 is about 10 μm to 15 μm smaller than the distance between a retention surface 41 the retaining clips 17 and the bearing surface 18 the pivoting cradle 14 ,

In 5 is an inventive drive train 45 shown. The drive train according to the invention 45 has an internal combustion engine 46 on which by means of a wave 47 a planetary gear 48 drives. With the planetary gear 48 become two waves 47 driven, being a first shaft 47 with a clutch 49 with a differential gear 56 connected is. A second or other shaft, which of the planetary gear 48 powered by a clutch 49 a first swash plate machine 50 on and the first swash plate machine 50 is by means of two hydraulic lines 52 with a second swashplate machine 51 hydraulically connected. The first and second swashplate machine 50 . 51 thereby form a hydraulic transmission 60 and from the second swash plate machine 51 can by means of a wave 47 also the differential gear 56 are driven. The differential gear 56 drives with the wheel shafts 58 the wheels 57 at. Furthermore, the drive train 45 two accumulators 53 as a high-pressure accumulator 54 and as a low-pressure accumulator 55 on. The two accumulators 53 are here by means not shown hydraulic lines with the two swash plate machines 50 . 51 hydraulically connected, so that mechanical energy of the internal combustion engine 46 in the high-pressure accumulator 54 hydraulically stored and further in a recuperation operation of a motor vehicle with the drive train 45 also kinetic energy of the motor vehicle in the high-pressure accumulator 54 can be stored hydraulically. By means of the high-pressure accumulator 54 stored hydraulic energy can be used with a swash plate machine 50 . 51 in addition the differential gear 56 are driven.

Overall, considered with the swash plate machine according to the invention 1 significant benefits. The retaining clips 17 lie with the retention surfaces 41 on the radially inner end portion 23 the retaining disc 37 on. At the radial inner end region 23 the rotating retaining disc 37 occurs at a low tangential velocity, so that thereby between the retention surfaces 41 the retaining clips 17 and the radially inner end portion 23 a low friction occurs. Between the rotating radial inner end region 23 and the fixed non-rotating retention surfaces 41 on the retaining clips 17 As a result, the friction power start is reduced and low, so that thereby the swash plate machine 1 low resulting energy losses and the efficiency of the swash plate machine 1 is significantly improved.

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

• EP 1013928 A2 [0003]
• CH 405934 [0004]
• DE 2733870 C2 [0005]

Claims (10)

Swashplate machine ( 1 ) as axial piston pump ( 2 ) and / or axial piston motor ( 3 ), comprising - one about an axis of rotation ( 8th ) rotatably or rotationally mounted cylindrical drum ( 5 ) with piston bores ( 6 ), - in the piston bores ( 6 ) movably mounted pistons ( 7 ), - one with the cylinder drum ( 5 ) at least rotatably connected drive shaft ( 9 ), which around the axis of rotation ( 8th ) is rotatably or rotationally mounted, - one about a pivot axis ( 15 ) pivotally mounted pivoting cradle ( 14 ) with a bearing surface ( 18 ), - sliding shoes ( 39 ), which at each a piston connection point ( 22 ) with one piston each ( 7 ), for the indirect storage of the pistons ( 7 ) on the support surface ( 18 ) of the pivoting cradle ( 14 ), - a retention disc ( 37 ) with a disc opening ( 38 ) for connecting the sliding shoes ( 39 ) and for the permanent direct or indirect contact of the sliding shoes ( 39 ) with the support surface ( 18 ), - at least one retaining clip ( 17 ), which on the retaining disc ( 37 ) rests directly or indirectly, for applying a retention force on the retaining disc ( 37 ), - a weighing storage ( 20 ) for the pivoting cradle ( 14 ), - at least one pivoting device ( 24 ) for pivoting the pivoting cradle ( 14 ), - a low-pressure opening ( 13 ) for introducing and / or discharging hydraulic fluid into and / or out of the rotating piston bores ( 6 ), - a high-pressure opening ( 12 ) for discharging and / or introducing hydraulic fluid from and / or into the rotating piston bores ( 6 ), characterized in that the at least one retaining clip ( 17 ), in particular exclusively, on a radial inner end region ( 23 ) at the disc opening ( 38 ) on the retaining disc ( 37 ) rests. Swash plate machine according to claim 1, characterized in that the at least one retaining clip ( 17 ) on the pivoting cradle ( 14 ) with a fastening device ( 33 ), in particular a screw ( 34 ) and / or the restraining force of the at least one retaining clip (FIG. 17 ) on the retaining disc ( 37 ) without an elastic element, z. B. a spring, can be applied. Swash plate machine according to claim 2, characterized in that the pivoting cradle ( 14 ) an opening ( 42 ) and the at least one retaining clip ( 17 ) completely through the opening ( 42 ) is guided by and the at least one retaining clip ( 17 ) with the fastening device ( 33 ) on a back side ( 43 ) of the pivoting cradle ( 14 ) is attached and / or the pivoting cradle ( 14 ) an opening ( 42 ) and the at least one retaining clip ( 17 ) in the region of the opening ( 42 ) on the pivoting cradle ( 14 ) is attached. Swash plate machine according to one or more of the preceding claims, characterized in that the at least one retaining clip ( 17 ) at one to the bearing surface ( 18 ) facing away ( 61 ) of the retaining disc ( 37 ) on the retaining disc ( 37 ) directly or indirectly at the radial inner end region (FIG. 23 ) rests. Swash plate machine according to one or more of the preceding claims, characterized in that the swash plate machine ( 1 ) several retaining clips ( 17 ) and / or the radial inner end region (FIG. 23 ) of the retaining disc ( 37 ) less than 40%, 30%, 20% or 10% of the total radial extent ( 67 ) of the retaining disc ( 37 ). Swash plate machine according to one or more of the preceding claims, characterized in that the retaining disc ( 37 ) at the radial inner end region (FIG. 23 ) on which the at least one retention chamber ( 37 ) rests, with a tribological coating, for. B. carbon, brass, PTFE or PEEK, is provided to reduce friction Swash plate machine according to one or more of the preceding claims, characterized in that the at least one retaining clip ( 17 ) at the area to rest on the retaining disc ( 37 ) with a tribological coating, for. B. carbon, brass, PTFE or PEEK, is provided to reduce friction. Swash plate machine according to one or more of the preceding claims, characterized in that the bearing surface ( 18 ) of the pivoting cradle ( 14 ) is formed and / or the at least one retaining clip ( 17 ) and / or the retention disc ( 37 ) and / or the sliding shoes ( 39 ) and / or the bearing surface ( 18 ) of the pivoting cradle ( 14 ), at least in part, in particular completely, made of metal, in particular steel or aluminum. Powertrain ( 45 ) for a motor vehicle, comprising - at least one swashplate machine ( 1 ) for the conversion of mechanical energy into hydraulic energy and vice versa, - at least one pressure accumulator ( 53 ), characterized in that the swash plate machine ( 1 ) is formed according to one or more of the preceding claims. Drive train according to claim 9, characterized in that the drive train ( 45 ) two swashplate machines ( 1 ), which are hydraulically connected to each other and as a hydraulic transmission ( 60 ) and / or the powertrain ( 45 ) two accumulators ( 53 ) as a high-pressure accumulator ( 54 ) and low-pressure accumulator ( 55 ).

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