EP2890892A1

EP2890892A1 - Swash plate machine

Info

Publication number: EP2890892A1
Application number: EP13742181.4A
Authority: EP
Inventors: Dirk SCHNITTGER; Dirk Vahle; Timo Nafz; Frank Scholz
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2012-08-28
Filing date: 2013-07-17
Publication date: 2015-07-08
Also published as: CN104755756A; DE102012215240A1; IN2015DN01593A; WO2014032849A1; CN104755756B

Abstract

The invention relates to a swash plate machine (1) as an axial piston pump (2) and/or axial piston motor (3), comprising a cylinder drum (5), which is mounted such that it is rotatable or rotates about a rotation axis (8), having piston bores (6), pistons (7) mounted movably in the piston bores (6), a drive shaft (9) connected in a rotationally fixed manner to the cylinder drum (5), a pivoting cradle (14), which is mounted such that it can pivot about a pivot axis (15), a cradle bearing for the pivoting cradle (14), at least one pivoting device (24) for pivoting the pivoting cradle (14), which device is connected to the pivoting cradle (14) at in each case one connection point (32), a low-pressure opening for letting hydraulic liquid into and/or out of the rotating piston bores (6), a high-pressure opening for letting hydraulic liquid out of and/or into the rotating piston bores (6), wherein, in an imaginary section having an imaginary section plane in and parallel to the rotation axis (8) of the cylinder drum (5) and perpendicular to the pivot axis (15) of the pivoting cradle (14), the swash plate machine (1) is divided into an imaginary first part featuring the high-pressure opening at the cylinder drum (5) and an imaginary second part featuring the low-pressure opening at the cylinder drum (5), and the resulting force, which is exerted by the at least one pivoting device (24) on the pivoting cradle (14), in particular owing to the configuration and/or arrangement of the at least one connection point (32), can be introduced into the pivoting cradle (14) in the imaginary second part, in order to reduce the pressure forces occurring between the cradle bearing and the pivoting cradle (14) in the imaginary first part.

Description

description

title

The present invention relates to a swash plate machine according to the

The preamble of claim 1 and a drive train according to the preamble of claim 11.

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 rotatably connected to a drive shaft and on a first part of the rotating piston bores temporarily acts a hydraulic fluid under high pressure and a second part of the rotating piston bores temporarily acts a hydraulic fluid under low pressure. A pivoting cradle is around one

Swivel axis mounted pivotably 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 performs together with the cylinder drum a rotational movement about an axis of rotation and a flat bearing surface of the pivoting cradle is at an acute angle to

Example between 0 ° and + 20 ° and between 0 ° and -20 °, aligned with the axis of rotation of the cylinder barrel. In an orientation of the support surface of the pivoting cradle perpendicular to the axis of rotation, d. H. with a swivel angle of 0 °, can be from the swash plate machine no mechanical in

hydraulic energy to be converted and vice versa. With two

Pivoting means, the pivot angle of the support surface relative to the Rotation axis, for example, between -20 ° and + 20 ° to be changed and the pivoting bring it a compressive force on the pivoting cradle. The pivoting cradle is on two bearing shells of a housing

Swash plate machine stored. In this case, greater forces are applied to the pivoting cradle of the rotating piston to hydraulic fluid under high pressure than from the piston to hydraulic fluid under low pressure. The two bearing shells are thereby subjected to an uneven pressure and the bearing shell on the fictitious first part of

Swash plate machine is exposed to a greater compressive force than the bearing shell on the fictitious second part of the swash plate machine with the low-pressure opening. The swashplate machine is of a fictional type

Section plane or center plane parallel to and in the axis of rotation of the cylinder drum and perpendicular to the pivot axis of the pivoting cradle divided into the fictitious first part and the fictitious second part. Due to these occurring different pressure forces on the two bearing shells on the two fictitious parts of the swash plate machine occurs at the one

Bearing shell or the corresponding sliding bearing on a higher mechanical wear, thereby adversely the service life of the swash plate machine is reduced. In addition, complex and costly measures for the slide bearing of the

Swing cradle required due to the larger pressure forces. The two pivoting devices and thus also the two connection points between the pivoting devices and the pivoting cradle are arranged centrally, that is to say in the fictitious sectional plane or center plane, so that the pressure forces applied by the two pivoting devices to the pivoting cradle are distributed uniformly over the two bearing shells. However, since larger forces are applied by the pistons under high pressure to the first part of the swash plate machine than from the pistons to the second part under low pressure, just mentioned uneven pressure forces occur on the two bearing shells and the bearing shell on the first fictitious part of

Swash plate machine thus has much greater compressive forces than the bearing shell on the fictitious second part of the swash plate machine.

EP 1 013 928 A2 shows an axial piston pump in swash plate construction with a driven circumferential and a plurality of piston bores arranged therein cylinder barrel, wherein in the respective by Webs of separate piston bores are arranged linearly between a bottom dead center and a top dead center movable piston and a low-pressure connection kidney and a high pressure connection kidney having control disk is provided.

The CH 405 934 shows a Schrägscheibenaxialkolbenpumpe whose non-rotating cylinder block for varying the flow rate in dependence on the delivery pressure is longitudinally displaceable, wherein at the pressed by a spring in the direction of increasing the delivery cylinder block a

Control slide unit is attached with a spool.

DE 27 33 870 C2 shows a control device for a

Oblique disk axial piston pump, on each side of the cradle for pivoting the swash plate, each a hydraulically acted upon

Swing wing on the engine attacks, both engines by means of a

Pivot axis of the cradle pivotally mounted plate-shaped control valve spool are controllable and serve to adjust the flow rate of the pump. 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 one rotatable about an axis of rotation or

rotating cylinder drum with piston bores, in the

Piston bores movably mounted pistons, a drive shaft rotatably connected to the cylinder drum, a swivel cradle pivotally mounted about a pivot axis, a weighing storage for the pivoting cradle, at least one pivoting device for pivoting the pivoting cradle, which is connected to the pivoting cradle at each junction, a low pressure opening to a - And / or discharge of hydraulic fluid into and / or out of the rotating piston bores, a high-pressure opening for discharging and / or introducing hydraulic fluid from and / or into the rotating piston bores, wherein in a fictional section with a fictitious

Cutting plane in and parallel to the axis of rotation of the cylinder drum and perpendicular to the pivot axis of the pivoting cradle the

Swash plate machine in a fictitious first part with the high-pressure opening on the cylinder drum and a fictitious second part with the

Low pressure opening is divided on the cylinder drum and the force applied by the at least one pivoting device on the pivoting cradle resulting force, in particular due to the formation and / or arrangement of the at least one connection point on the fictitious second part in the pivoting cradle can be introduced to the pressure forces occurring between the Weighing storage and the pivoting cradle to reduce the fictitious first part.

The resultant of the at least one pivoting device on the pivoting cradle resulting force, in particular total force is applied to the fictitious second part of the pivoting cradle. The indirectly applied by the movably mounted pistons on the pivoting cradle forces are greater on the first fictitious part of the swash plate machine than on the fictitious second part of the swash plate machine, since the located on the fictitious first part of the swash plate machine piston are under high pressure and thereby on the pivoting cradle of the piston is applied to the first part a greater force. For uniform distribution of forces acting on the weighing storage between the first and second fictitious part thus acts of the at least one pivoting force applied force on the fictitious second part of the swash plate machine or pivoting cradle, thereby characterized the weighing storage compared to an application of the resulting force is less loaded on the fictitious sectional plane or median plane at the first part and is loaded to a greater extent on the fictitious second part. As a result, with a corresponding design, a substantially uniform application of force to the weighing storage between the first and second fictitious part can be achieved.

In a further embodiment, the weighing storage is to the effect

designed such that the pivot axis of the pivoting cradle in a

Swiveling the pivoting cradle a pan or rotation and

Translational movement performs. The swivel cradle thus leads to the

Pivoting both a pivoting movement and a

Translational movement off. Preferably, the at least one pivoting device is designed as a spindle drive with an electric motor for driving the spindle drive.

In an additional embodiment, the one of the at least one

Pivoting means applied to the pivoting cradle resulting force exclusively on the second part in the pivoting cradle and / or the swashplate machine comprises a plurality of pivoting devices and all pivoting devices, which are applied by the pivoting devices on the pivoting cradle resulting forces exclusively at the second part in the pivoting cradle can be introduced. Preferably, the resulting forces are introduced or can be introduced from all the pivoting devices on the second part, in particular exclusively, into the pivoting cradle, so that all resulting forces applied by the pivoting devices to the pivoting cradle contribute to the uniform application of force to the cradle support.

In a supplementary variant, that of the at least one

Pivoting means applied to the pivoting cradle resulting force at a distance of at least 0.2 cm, 0.5 cm, 1 cm, 3 cm, 5 cm, 7 cm, 10 cm or 20 cm to the fictitious sectional plane at the second part in the

The pivoting cradle can be introduced and / or the at least one connection point is at a distance of at least 0.2 cm, 0.5 cm, 1 cm, 3 cm, 5 cm, 7 cm, 10 cm or 20 cm from the notional sectional plane at the second part formed and / or the swash plate machine comprises a plurality of pivoting means and in all pivoting devices, the forces applied to the pivoting cradle resulting forces at a distance of at least 0.2 cm, 0.5 cm, 1 cm, 3 cm, 5 cm, 7 cm, 10 cm or 20 cm to the fictitious sectional plane at the second part in the pivoting cradle can be introduced and / or the at least one connection point and / or the at least one pivoting device, in particular all connection points and / or all

Pivoting means, is or are formed at a distance of at least 0.2 cm, 0.5 cm, 1 cm, 3 cm, 5 cm, 7 cm, 10 cm or 20 cm to the notional sectional plane at the second part. In a supplementary variant, the amount of the difference of the distance from the geometric center of gravity of the high-pressure opening to the fictitious

Sectional plane and of the at least one connection point to the fictitious sectional plane less than 1 cm, 3 cm, 5 cm, 7 cm, 10 cm or 20 cm, wherein the distance is aligned perpendicular to the notional sectional plane.

Appropriately, the swash plate machine has two pivoting devices, in particular only two pivoting devices, on and / or on the

Swivel cradle are formed two pivot arms and the connection points are formed on an end portion of the pivot arms and / or the at least one connection point, in particular all connection points, is or are, in particular exclusively, formed outside the fictitious sectional plane. In particular, the at least one interface is thus not cut from the fictitious sectional plane.

In an additional embodiment, the at least one

Pivoting means an adjusting piston for applying a compressive force on the at least one connection point and preferably the pressure force is aligned in the direction of the axis of rotation to the pivoting cradle. The

Swivel device has an adjusting piston, which is acted upon in particular by a hydraulic fluid, and thereby is of the

Adjusting piston, in particular exclusively, applied a compressive force in the direction of the axis of rotation in the direction of the pivoting cradle of the pivoting device on the pivoting cradle at the connection point.

In an additional embodiment, the swash plate machine has a housing and the housing is formed in one or more parts and / or the weighing storage is formed by two bearing shells on soft directly or indirectly depending on a bearing portion of the pivoting cradle and the

Bearing shells are preferably arranged separately in the first and second fictitious part of the swashplate machine. The two bearing shells can also be connected to one another by means of a connecting shell of the bearing shell cut from the fictitious sectional plane. In an additional embodiment, the bearing shells are formed on the housing and / or the bearing shells and the at least one bearing portion are formed in a section parallel to the fictitious sectional plane of a circle segment. A circular segment-shaped design of the bearing shells and the bearing section in the section parallel to the fictitious sectional plane is required to pivotally mount the pivoting cradle about a pivot axis.

In a supplementary embodiment, the weighing storage is designed as a sliding bearing and between the bearing shells and the bearing sections is ever a Gleitzwischenteil made of metal, z. B. brass, plastic, z. As PTFE, or metal, z. As steel or brass, with plastic coating, z. B. PTFE, arranged. The Gleitzwischenteil, z. B. PTFE, serves to reduce the friction on the sliding bearing.

In an additional embodiment, the cradle bearing is formed as a rolling bearing and between the bearing shell and the bearing portions

Rolling elements, for example balls or rollers arranged.

In an additional embodiment, the swashplate machine comprises a valve disk with the high-pressure opening and the low-pressure opening, and the valve disk rests on the cylinder drum, and preferably

High-pressure opening and low-pressure opening kidney-shaped. The high-pressure opening is formed on the first fictitious part and the low-pressure opening is formed on the second fictitious part of the swash plate machine. The valve disc is fixed and does not rotate and is located on the rotating cylinder drum directly or indirectly. As a result, the piston bores formed in the cylinder drum can be acted upon alternately with the hydraulic fluid under high pressure or low pressure. In a supplementary embodiment, the swash plate machine has a

Retaining disc on and on the retaining disc sliding shoes are fixed on soft each a piston is fixed, so that the retaining disc together with the shoes the rotational movement of the cylinder drum with the piston carries out and the retaining disc rests directly or indirectly on the pivoting cradle. Inventive drive train 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 as one in this patent application

described swash plate machine is formed.

Preferably, the drive train comprises 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 ais

High pressure accumulator and low pressure accumulator.

Brief description of the drawings

Hereinafter, an embodiment of the invention below

With reference to the accompanying drawings described in more detail. It shows:

1 is a longitudinal section of a swash plate machine,

Fig. 2 shows a cross section A-A of FIG. 1 a valve disc of

Swashplate machine and a view of a pivoting cradle,

Fig. 3 is a perspective view of the pivoting cradle with two

Pivoting devices, a cylinder drum and a valve disc,

4 shows a cross section of a pivoting cradle and a bearing shell for

the pivoting cradle of the swashplate machine according to FIG. 1,

Fig. 5 is a bending beam model of the pivoting cradle and

6 shows a drive train for a motor vehicle.

Embodiments of the invention

A swash plate machine 1 shown in a longitudinal section in FIG. 1 serves as an axial piston pump 2 for the 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,

Rotation speed). A drive shaft 9 is by means of two bearings 10 on a one-piece or multi-part housing 4 of the swash plate machine 1 to a

Rotation axis 8 rotatably or rotatably mounted (Fig. 1). With the drive shaft 9, a cylinder drum 5 is rotatably connected, so thereby the

Cylinder drum 5, the rotational movement of the drive shaft 9 carries out with. In the cylinder drum 5, a plurality of piston bores 6 with an arbitrary cross section, for example square or circular, incorporated.

The longitudinal axes of the piston bores 6 are substantially parallel to the axis of rotation 8 of the drive shaft 9 or the cylinder drum 5

aligned. In the piston bores 6 each have a piston 7 is movably mounted. A pivoting cradle 14 is mounted pivotably about a pivot axis 15 on the housing 4. The pivot axis 15 is perpendicular to the

Drawing plane of Fig. 1 and 4 and aligned parallel to the plane of Fig. 2. The axis of rotation 8 of the cylinder drum 5 is arranged parallel to and in the plane of the drawing of FIG. 1 and perpendicular to the plane of the drawing of FIG. 2.

The pivoting cradle 14 has a planar or planned support surface 18 for the indirect support of a retaining disk 37, since between the

Retaining disc 37 and the support surface 18 of the pivoting cradle 14, an intermediate disc 38 is arranged. The retaining disc 37 is provided with a plurality of sliding shoes 39 and each sliding block 39 is connected to a respective piston 7. For this purpose, the sliding block 39 a

Bearing ball 40 (Fig. 1), which is fixed in a bearing cup 59 on the piston 7. The partially spherical bearing ball 40 and

Bearing pan 59 are both complementary or spherical, so that in a corresponding movement possibility to each other between the bearing ball 40 and the bearing cup 59 to the piston 7, a permanent connection between the piston 7 and the shoe 39 is present. The washer 38 serves to frictional forces between the rotating retaining disc 37 and the rotationally fixed and non-rotating around the

Rotary axis 8 mounted pivoting cradle 14 to reduce. Due to the

Connection of the piston 7 with the rotating cylinder drum 5 and the Connection of the bearing cups 59 with the shoes 39 lead the shoes 39 a rotational movement about the axis of rotation 8 with and due to the fixed connection or arrangement of the shoes 39 on the retaining disc 37 and the retaining plate 37 performs a rotational movement about the

Rotation axis 8 with out. Thus, the retaining plate 37 is in constant indirect contact with the support surface 18 of the pivoting cradle 14, this is pressed by a compression spring 41 under a compressive force on the support surface 18. The pivoting cradle 14 is - as already mentioned - pivotally mounted about the pivot axis 15 and also has an opening 42 (Fig. 1 and 3) for the implementation of the drive shaft 9. On the housing 4, a weighing storage 20 is formed and this weighing storage 20 is shown only dashed due to the sectional formation in Fig. 1. At the weighing storage 20 is a

Bearing shell 21 (Fig. 4) is formed, which in a section perpendicular to the

Pivot axis 15 of FIG. 1 and 4 is formed circular segment. In this case, 14 two bearing portions 17 are formed on the pivoting cradle, which are circular segment-shaped in this section. The two bearing portions 17 of the pivoting cradle 14 are located on the two bearing shells 21 of the weighing storage 20 indirectly, since between the bearing shell 21 and the bearing portion 17 of the

Pivoting cradle 14 is arranged in each case a Gleitzwischenteil 23 made of plastic. The pivoting cradle 14 is thus by means of a sliding bearing 22 at the

Weighing 20 and the housing 4 about the pivot axis 15th

pivoted. In the illustration in Fig. 1, the support surface 18 according to the sectional formation in Fig. 1 has a pivot angle α of approximately + 20 °. The pivot angle α is between a fictitious plane perpendicular to the axis of rotation 8 and one of the flat bearing surface 18 of

The pivoting cradle 14 can be pivoted between a pivoting angle α between + 20 ° and -20 ° by means of two pivoting devices 24. A notional sectional plane 33 is oriented perpendicular to the pivot axis 15 of the pivot cradle 14 and parallel to and in the axis of rotation 8 of the cylinder barrel 5, d. H. the axis of rotation 8 lies in the fictitious

Section plane 33. In Fig. 1, the plane of the notional cutting plane 33 corresponds to 33 and in Fig. 2, the fictitious sectional plane 33 is shown by dashed lines and perpendicular to the plane of Fig. 2. The fictitious sectional plane 33 divides the Swash plate machine 1 in a first notional part 34 and a second notional part 35. The first notional part 34 is shown in Fig. 1 above the plane and in Fig. 2 left of the fictitious sectional plane 33 and the second fictitious part 35 is below the drawing plane of Fig. 1 and in Fig. 2 right of the fictitious sectional plane 33. The two pivoting devices

24 are arranged off-center or not on the fictitious sectional plane 33 or fictitious center plane 34, but on the second fictitious part 35. As a result, the two pivoting devices 24 are shown only in broken lines in the sectional view of FIG. 1, since they are actually in the section are not cut according to FIG. 1.

The first and second pivoting means 25, 26 as pivoting means 24 are arranged on the second fictitious part 35 and thereby has a

Junction 32 as the middle junction 32 between the

Swivel device 24 and the pivoting cradle 14 to the fictitious

Cutting plane 33 a distance 36 (Fig. 2 and 5). The distance 36 is perpendicular to the notional sectional plane 33 and represents the minimum distance from the middle connection point 32 to the fictitious sectional plane 33. The two pivoting devices 24 each have an adjusting piston 29, which is movably mounted in an adjusting cylinder 30. The adjusting piston 29 or an axis of the adjusting cylinder 30 is aligned substantially parallel to the axis of rotation 8 of the cylinder drum 5. At one in Fig. 1 left end portion of the adjusting piston 39 has this one

Bearing pan 31, in which a bearing ball 19 is mounted. In this case, the bearing ball 19 on a pivot arm 16 (Fig. 1 to 3) of the pivoting cradle 14 is present. The first and second pivoting means 25, 26 is thus connected to a respective pivot ball 19 on a respective pivot arm 16 with the pivoting cradle 14. By opening one of the two valves 27, 28 as the first valve 27 on the first pivoting device 25 and the second valve 28 on the second counter 26 as shown in FIG

Pivoting cradle 14 are pivoted about the pivot axis 15, since a force is applied to the adjusting piston 29 at the open valve 27, 28. It leads not only the pivoting cradle 14, but also the

Retaining disc 37 due to the pressurization with the compression spring 41, this pivotal movement of the pivoting cradle 14 with. During operation of the swash plate machine 1 as axial piston pump 2, the larger the absolute value of the volume flow delivered by the swash plate machine 1, the larger the absolute value of the

Swivel angle α is and vice versa. For this purpose, a valve disk 1 1 is located on the end of the cylinder drum 5 shown on the right in FIG. 1, with a kidney-shaped high-pressure opening 12 and a kidney-shaped

Low-pressure opening 13. The piston bores 6 of the rotating cylinder drum 5 are thus fluidly connected in an arrangement on the high-pressure opening 12 with the high-pressure opening 12 and in an arrangement on the

Low-pressure port 13 fluidly connected to the low pressure port 13. The

High-pressure opening 12 is at the first fictitious part 34 and the

Low pressure port 13 formed on the second fictitious part 35. In a swivel angle α of 0 ° and in an operation of the swash plate machine, for example, as axial piston 2, despite a rotational movement of the drive shaft 9 and the cylinder drum 5 no hydraulic fluid from the

Axial piston pump 2 promoted because the piston 7 perform no strokes in the piston bores 6.

When the swash plate machine 1 is operated both as an axial piston pump 2 and as an axial piston motor 3, they are temporarily in the first fictitious part 34 in fluid-conducting connection with the high-pressure opening 12

Piston holes 6 a greater pressure on hydraulic fluid than the piston bores 6 on the second fictitious part 35, which are temporarily in fluid communication with the low-pressure port 13. The

resulting force as a compressive force, which is applied by all the pistons 7 in the direction of the axis of rotation 8 on the pivoting cradle 14 is thus eccentrically as a resultant force F _z , that is not arranged on the fictitious sectional plane 33 of FIG. 2, but as shown in FIG 2 left of the fictitious sectional plane 33. As a result, the two bearing shells 21st

unevenly acted upon by the resulting compressive force F _z , that is the

Bearing shell 21 on the first fictitious part 34 has a larger

Pressurization due to the resultant force F _z , as the

Bearing shell 21 on the second fictitious part 35. Furthermore, bring the two pivoting means 24 a resultant force as a compressive force F _s in the direction of the axis of rotation 8 on the pivoting cradle 14 on. The two

Junctions 32 have the distance 36 to the fictitious sectional plane 33 and thereby also indicates the resulting pressure force F _s of

Swiveling 24 on the distance 36 to the notional sectional plane 33. In this case, the distance 36 of the two connection points 32 is chosen such that the resultant force F _L at the two bearing shells 21 is substantially equal, so that the two bearing shells 21 act on the first and second notional part 34, 35 respectively with the substantially same compressive force are. In Fig. 5, a bending beam model for the pivoting cradle 14 is shown. A bending beam 43 is mounted on two beam bearings 44, which correspond to the two bearing shells 21. On the bending beam 44, the resulting pressure force F _{z of} all pistons 7 and the resulting pressure force acts

F _{s of} the two pivoting devices 24. The resulting force F _L as a bearing force of the two beam bearings 44 is substantially equal.

In Fig. 6, an inventive drive train 45 is shown. Of the

Drive train 45 according to the invention has an internal combustion engine 46, which drives a planetary gear 48 by means of a shaft 47. With the

Planetary gear 48, two shafts 47 are driven, wherein a first shaft 47 is connected to a clutch 49 with a differential gear 56. A second or other shaft driven by the planetary gear 48 drives a first swash plate machine 50 through a clutch 49, and the first swash plate machine 50 is hydraulically connected by means of two hydraulic lines 52 to a second swash plate machine 51. The first and second swash plate machines 50, 51 thereby form a hydraulic gear 60, and from the second swash plate machine 51, the differential gear 56 can also be driven by means of a shaft 47. The

Differential gear 56 drives the wheels 57 with the wheel shafts 58. Furthermore, the drive train 45 has two pressure accumulators 53 as a high-pressure accumulator 54 and as a low-pressure accumulator 55. The two accumulators 53 are hydraulically connected by means not shown hydraulic lines with the two swash plate machines 50, 51, thereby mechanical energy of the

Internal combustion engine 46 can be hydraulically stored in the high pressure accumulator 54 and also in a recuperation 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 hydraulic energy stored in the high-pressure accumulator 54 can with a Swash plate machine 50, 51 additionally the differential gear 56 are driven.

Overall, significant advantages are associated with the swash plate machine 1 according to the invention. The two pivoting devices 24 are eccentrically formed on the second fictitious part 35 of the swash plate machine 1, thereby characterized by the two bearing shells 21st

absorbed bearing forces are substantially equal. As a result, an unnecessarily large wear on the bearing shell 21 on the first notional part 34 can be avoided in an advantageous manner. The plain bearing 22 is thus equipped with a longer life and the cost of producing the swash plate machine 1 can be reduced because the sliding bearing 22 is to be dimensioned only to lower pressure forces.

Claims

claims

1 . Swash plate machine (1) as axial piston pump (2) and / or

Axial piston engine (3), comprising

a cylinder drum (5) rotatably or rotationally mounted about a rotation axis (8) and having piston bores (6),

- in the piston bores (6) movably mounted pistons (7),

- one with the cylinder drum (5) rotatably connected drive shaft (9),

- One about a pivot axis (15) pivotally mounted

Pivoting cradle (14),

a weighing support (20) for the pivoting cradle (14),

- At least one pivoting device (24) for pivoting the pivoting cradle (14) which is connected to the pivoting cradle (14) at a respective connection point (32),

- A low-pressure opening (13) for entry and / or exit from

Hydraulic fluid in and / or out of the rotating

Piston bores (6),

- A high-pressure opening (12) for discharging and / or discharge of

Hydraulic fluid from and / or into the rotating

Piston bores (6), characterized in that in a notional section with a notional sectional plane (33) in and parallel to the axis of rotation (8) of the cylinder drum (5) and perpendicular to the

Pivot axis (15) of the pivoting cradle (14)

Swash plate machine (1) in a fictitious first part (34) with the high pressure opening (12) on the cylinder drum (5) and a fictitious second part (35) with the low pressure opening (13) on the cylinder drum (5) is divided and the of the at least one pivoting device

(24) force applied to the pivoting cradle (14), in particular due to the formation and / or arrangement of the at least one connection point (32) on the fictitious second part (35) in the pivoting cradle (14) can be introduced to the pressure forces between the weighing storage (20) and the pivoting cradle (14) to reduce the fictitious first part (34).

Swash plate machine according to claim 1, characterized in that the at least one pivoting device (24) on the

Pivoting cradle (14) applied resultant force exclusively on the second part (35) in the pivoting cradle (14) can be introduced and / or

the swashplate machine (1) comprises a plurality of pivoting devices (24) and in all pivoting devices (24) the resultant forces exerted by the pivoting devices (24) on the pivoting cradle (14) can be introduced into the pivoting cradle (14) exclusively at the second part (35) ,

Swash plate machine according to claim 1 or 2, characterized in that the at least one pivoting device (24) on the

Pivoting cradle (14) applied resultant force at a distance of at least 0.2 cm, 0.5 cm, 1 cm, 3 cm, 5 cm, 7 cm, 10 cm or 20 cm to the notional sectional plane (33) on the second part (35) in the pivoting cradle (14) can be introduced

and or

the at least one joint (32) at a distance of at least 0.2 cm, 0.5 cm, 1 cm, 3 cm, 5 cm, 7 cm, 10 cm or 20 cm from the notional sectional plane (33) at the notional second Part (35) is formed

and or

the swash plate machine (1) several pivoting devices (24) and at all pivot means (24), the resultant forces applied to the pivoting cradle (14) are at a distance of at least 0.2 cm, 0.5 cm, 1 cm, 3 cm, 5 cm, 7 cm, 10 cm or 20 cm to the fictitious sectional plane (33) on the second part (35) in the pivoting cradle (14) can be introduced

and or

the at least one connection point (32) and / or the at least one pivoting device (24), in particular all connecting points (32) and / or all pivoting devices (24), at a distance of at least 0.2 cm, 0.5 cm, 1 cm , 3 cm, 5 cm, 7 cm, 10 cm or 20 cm to the notional sectional plane (33) is or are formed on the notional second part (35).

Swash plate machine according to one or more of

preceding claims, characterized in that the swash plate machine (1) has two pivoting devices (24), in particular only two pivoting devices (24)

and or

on the pivoting cradle (14) has two pivot arms (16) are formed and the connecting points (32) at an end region of the pivot arms (16) are formed

and or

the at least one connection point (32), in particular all connection points (32), outside the fictitious sectional plane (33), in particular exclusively, are formed.

Swash plate machine according to one or more of

preceding claims, characterized in that the at least one pivoting device (24) has an adjusting piston (29) for applying a compressive force to the at least one Junction (32) and preferably the compressive force in the direction of the axis of rotation (8) to the pivoting cradle (14) is aligned.

Swash plate machine according to one or more of

previous claims, characterized in that the swash plate machine (1) has a housing (4) and the

Housing (4) one or more parts is formed

and or

the weighing bearing (20) of two bearing shells (21) is formed on which directly or indirectly depending on a bearing portion (17) of the pivoting cradle (14) and the bearing shells (21) preferably separated in the first and second fictitious part (34, 35) of the

Swash plate machine (1) are arranged.

A swashplate machine according to claim 6, characterized in that the bearing shells (21) are formed on the housing (4)

and or

the bearing shells (21) and the at least one bearing section

Bearing portion (17) are formed in a section parallel to the fictitious sectional plane (33) of a circular segment.

A swashplate machine according to claim 6 or 7, characterized in that the weighing bearing (20) is designed as a slide bearing (22) and between the bearing shells (21) and the bearing sections (17) each have a Gleitzwischenteil (23) made of metal, for. B. brass, plastic, z. As PTFE, or metal, z. As steel or brass, with Plastic coating, z. B. PTFE, is arranged.

9. swashplate machine according to one or more of

previous claims, characterized in that the swash plate machine (1) a valve disc (1 1) with the

High-pressure opening (12) and the low pressure opening (13) and the valve disc (1 1) rests on the cylinder drum (5) and preferably the high pressure opening (12) and low pressure opening (13) are kidney-shaped.

10. swash plate machine according to one or more of

preceding claims, characterized in that the swash plate machine (1) has a retaining disc (37) and on the retaining disc (37) sliding shoes (39) are fixed on each of which a piston (7) is fixed, so that the retaining disc (37) together with the sliding shoes (39) performs the rotational movement of the cylinder drum (5) with the piston (7) and the

Retaining disc (37) on the pivoting cradle (14) rests directly or indirectly.

1 1. Drive train (45) for a motor vehicle, comprising

at least one swash plate machine (1) for converting mechanical energy into hydraulic energy and vice versa,

- At least one pressure accumulator (53), characterized in that the swash plate machine (1) is designed according to one or more of the preceding claims.

12. Drive train according to claim 1 1, characterized in that the drive train (45) comprises two swash plate machines (1), which are hydraulically connected to each other and act as a hydraulic transmission (60)

and or

the drive train (45) comprises two pressure accumulators (53) as high-pressure accumulator (54) and low-pressure accumulator (55).