CN118669293A - Axial piston machine - Google Patents

Abstract

The invention relates to an axial piston machine (1) with a housing (2), the housing comprising a first housing part and a second housing part (2.1, 2.2), wherein the first housing part (2.1) is designed in the shape of a pot and has a flat joint surface (3) at the open end, which surrounds the interior (4) of the housing (2) in an annular manner, wherein the second housing part (2.2) rests against the joint surface (3) in a fluid-tight manner over the entire circumference of the joint surface, forming a sealing engagement, wherein the second housing part (2.2) or a separate distributor plate fastened to the second housing part forms a control surface with a first and a second kidney-shaped control structure. A particularly stable connection to a superordinate component such as a hydraulic assembly is achieved in that the first housing part has a mounting surface in which the first and second working connections are arranged.

Description

Axial piston machine

Technical Field

The present invention relates to an axial piston machine according to the preamble of claim 1, in particular an axial piston machine with a housing, the housing comprising a first housing part and a second housing part, wherein the first housing part is designed in a pot-like shape and has a flat joint surface at the open end, the flat joint surface annularly surrounding the interior space of the housing, wherein a cylinder drum is accommodated in the first housing part in a manner rotatable about a rotation axis, wherein the second housing part abuts against the joint surface in a fluid-tight manner over the entire circumference of the joint surface while forming a sealing interlocking structure, wherein the second housing part or a separate distribution plate fixed to the second housing part forms a control surface with a first kidney-shaped control structure and a second kidney-shaped control structure, wherein the cylinder drum is supported at the control surface in the direction of the rotation axis.

In the axial piston machine of the aforementioned construction type that can be operated as a pump or as a motor, a plurality of cylinders configured as bores are provided in the cylinder drum that rotates around the shaft, and each piston is guided in the cylinder. The axis of rotation is formed by the rolling of the shaft and the cylinder. The axial piston machine is designed as a swash plate type, for example, so that each piston is connected to the swash plate of the swing cradle with a so-called sliding shoe. The tilt of the swing cradle may be adjusted relative to the cylinder drum to set the stroke of the piston. When the axial piston machine is operated as a motor, the displacement and the output speed of the shaft can be set with this adjustment of the swing cradle. When the axial piston machine is operated as a pump, the delivery volume can be set with this adjustment of the swing cradle. When the swing cradle is adjusted to a position exceeding a 90° angle relative to the axis of rotation (in which the stroke of the cylinder cannot be performed), the delivery direction is switched in the pump operation and the rotation direction is switched in the motor operation. The hydrostatic axial piston machine has a first working connection or a first pressure side A and a second working connection or a second pressure side B in order to supply a fluid or a pressure medium to the axial piston machine or to discharge the fluid or the pressure medium from the axial piston machine.

Background Art

Such a swash plate axial piston machine is known from DE 10 2019 212 074 A1. The axial piston machine can be attached to the hydraulic assembly by means of a separate connecting body, so that no separate pipeline is required to connect the axial piston machine to the hydraulic assembly fluid. The connection is made in the area of a connecting surface formed in the connecting body. Bolts are also introduced into the connecting surface so that the axial piston machine can also be mechanically connected to the hydraulic assembly only via the connecting body. The axial piston machine itself is connected to the connecting body by means of a housing part of the axial piston machine. A control plate with a control surface formed thereon is arranged between the connecting body and the hydraulic machine.

The stability of this arrangement of axial piston machine and connection body, especially in the connected state with the hydraulic assembly, has not yet been designed to be optimal. Of course, the hydraulic machine is then arranged in particular with components that rotate during operation protruding from the connection surface, so that correspondingly large bending loads act on the connection body in the area of the connection surface.

Summary of the invention

The object of the present invention is to provide an axial piston machine which reduces or eliminates the problems of the prior art, in particular to enable a connection to a superordinate component such as a hydraulic assembly which is as stable as possible.

This object is achieved firstly by an axial piston machine according to claim 1 .

Further advantageous embodiments are the subject matter of the dependent claims.

More precisely, the task is solved in that the first housing part has an attachment surface, in which the first and second working connections are arranged, wherein the first fluid channel is guided from the first working connection through the joining surface toward the first kidney-shaped control structure, wherein the second fluid channel is guided from the second working connection through the joining surface toward the second kidney-shaped control structure, and the joining surface surrounds the first fluid channel and the second fluid channel respectively on the entire circumference of the fluid channel, so that the sealing interlocking structure surrounds the first fluid channel and the second fluid channel respectively in a fluid-tight manner.

The attachment surface is preferably designed to be flat. In addition, the attachment surface is preferably arranged parallel to the rotation axis of the cylinder drum. The sealing engagement structure surrounds the first fluid channel and the second fluid channel in a fluid-tight manner, especially between the first and second housing parts in the region of the joint surface. The first housing part can be connected to a superior component such as a hydraulic assembly by the attachment surface. Because the first housing part is designed to be pot-shaped so as to accommodate important elements such as cylinder drums of the axial piston machine, the attachment surface can also be designed to be large accordingly. The second housing part and/or the separate distribution plate with the control surface of the first and second kidney-shaped control structures is then smaller and designed to be very narrow with respect to the rotation axis, so that only this narrow second housing part protrudes from the attachment surface. Therefore, the bending load acting on the first housing part in the region of the attachment surface is reduced to a minimum. The vibration of the axial piston machine during the operation of the axial piston machine is also actively affected. In addition, in this housing structure of the axial piston machine and in the corresponding connection of the attachment surface with the hydraulic assembly, all necessary fluid connections between the hydraulic assembly and the axial piston machine and in the axial piston machine itself can be realized through the channels in the housing part. This also facilitates the installation of the axial piston machine on such a hydraulic assembly, since only a mechanical connection has to be established and no hoses or lines have to be installed. Fluid communication is also achieved by a corresponding arrangement of connectors in the mounting surface, which are arranged on the mounting surface in a matching manner with corresponding connectors of the hydraulic assembly.

The axial piston machine is advantageously designed as a swash plate and has a pivot cradle, the swash plate being designed on the pivot cradle, wherein the pivot cradle is accommodated in the first housing part. Alternatively, the axial piston machine is designed as a swash plate machine.

In an advantageous embodiment of the axial piston machine, an oil leakage connection is arranged in the attachment surface, which connection opens into the interior via a leakage oil channel.

Fluid, such as hydraulic oil, which collects in the interior during operation of the axial piston machine can thus be discharged via the leakage oil channel and the leakage oil connection, for example into a tank.

The control valve supply channel preferably leads from the first fluid channel or the second fluid channel through the joining surface to the control valve of the axial piston machine. The joining surface surrounds the control valve supply channel over its entire circumference so that the sealing engagement surrounds the control valve supply channel in a fluid-tight manner.

The fluid pressure generated by the pump operation of the axial piston machine or the fluid pressure used to drive the axial piston machine in motor operation is also used in this way to operate the control valve. The control valve is used in particular to adjust the swivel cradle of the axial piston machine designed as a swash plate. The angle of this swivel cradle influences the stroke of the piston of the axial piston machine guided in the cylinder drum.

In another advantageous embodiment of the axial piston machine, an actuating pressure connection is arranged in the mounting surface, wherein the actuating valve supply channel is guided from the actuating pressure connection through the joining surface to the actuating valve of the axial piston machine. The joining surface surrounds the actuating valve supply channel over its entire circumference, so that the sealing engagement surrounds the actuating valve supply channel in a fluid-tight manner.

The control pressure of the control valve is then generated externally and is provided in particular by a hydraulic assembly connected to the axial piston machine during operation. In contrast to the fluid branching off from the first fluid channel or the second fluid channel for the control valve, it is thus possible to avoid influencing the rotation of the axial piston machine, since the flow through the first fluid channel or the second fluid channel is not influenced when the control valve is supplied with fluid. The control valve can be actuated both hydraulically and electrically. For electrical actuation, a current connection is provided to provide electrical energy.

It is further preferred that a bearing flushing connection is arranged in the attachment surface. The bearing flushing channel is guided from the bearing flushing connection through the joint surface to the bearing of the shaft of the axial piston machine which is connected to the cylinder drum in a rotationally fixed manner. The joint surface also surrounds the bearing flushing channel over its entire circumference, so that the sealing engagement surrounds the bearing flushing channel in a fluid-tight manner.

The bearing is therefore always sufficiently lubricated. In contrast to this supply of fluid from the bearing flushing connection, it is also conceivable that fluid is supplied to the bearing from the interior.

Advantageously, at least one fastening interface is arranged and/or formed in the attachment surface, the at least one fastening interface being formed for connection to a fastening means, so that the first housing part can be connected to the hydraulic assembly by means of the fastening means.

The fixing means are preferably designed as screws and/or heavy-duty clamping pins. When the first housing part is mounted on the hydraulic assembly, the first housing part and the hydraulic assembly are also aligned with each other by means of such screws and/or heavy-duty clamping pins.

Preferably, at least one annular sealing structure is provided in the sealing interlocking structure, which is arranged in a groove circumferentially arranged in the joint surface, and the groove preferably annularly surrounds the interior space of the housing, the first fluid channel, the second fluid channel, the regulating valve supply channel and/or the bearing flushing channel, and/or, wherein, a planar sealing structure abutting the joint surface is provided in the sealing interlocking structure, and the planar sealing structure respectively has recesses for the interior space of the housing, the first fluid channel, the second fluid channel, in particular the regulating valve supply channel and in particular the bearing flushing channel.

By means of the annular sealing structure and/or the flat sealing structure, a good sealing effect can be achieved with little effort. In contrast, in extreme cases, it is also conceivable to produce a sealing effect between the first and second housing parts by flat fit and without further sealing elements.

In a preferred embodiment of the axial piston machine, the first housing part is designed in one piece. The first housing part has a flange oriented substantially perpendicular to the attachment surface for connecting an electric motor or another axial piston machine. The operating vibrations of the axial piston machine thus result in particularly low noise.

The shaft advantageously projects from the first housing part and the second housing part, in particular with an external toothing, so that the shaft can be connected in a rotationally fixed manner to the electric motor or another axial piston machine, respectively.

In this way, a standard motor can be connected to an internally toothed shaft or to the shaft of an axial piston pump via a coupling. In addition, such a shaft extending on both sides also enables so-called full transmission, i.e. the series connection of two or more axial piston machines. In this case, the shafts of two adjacent axial piston machines are connected to one another, for example, by means of a coupling.

In another advantageous embodiment of the axial piston machine, the first and second kidney-shaped control structures are constructed essentially in a mirror-symmetrical manner with respect to a plane arranged parallel to the joint surface. This plane is perpendicular to the axis of rotation and can therefore be referred to as a transverse plane. The kidney-shaped control structure is then in neutral when the flow direction is switched. In particular, when the two kidney-shaped control structures are also identical, the axial piston machine can advantageously be operated in all four quadrants. That is to say, the axial piston machine can be operated as a pump or as a motor in both directions of rotation.

The first working connection is preferably arranged on a first side of a central plane of the axial piston machine extending along the rotation axis of the cylinder drum and perpendicular to the attachment surface. The second working connection is preferably arranged on a second side of this central plane opposite the first side.

The first fluid channel further preferably penetrates the joining surface in a first corner region on a first side of the central plane, and the second fluid channel penetrates the joining surface in a second corner region on a second side of the central plane.

By arranging the two fluid channels on two opposite sides of the central plane, the fluid channels can be designed to be particularly short, which has a particularly positive effect on the fluid resistance when flowing through the fluid channels. In addition, the structural space formed by the housing parts is particularly well utilized, that is to say, the housing parts can be designed to be particularly compact.

The first kidney-shaped control structure is advantageously formed on a first side of the central plane and the second kidney-shaped control structure is advantageously formed on a second side of the central plane.

The two fluid channels leading to the first and second kidney-shaped control structures can then be designed substantially in the same manner, wherein the second fluid channel is produced by the mirror image formation of the first fluid channel at the central plane. The axial piston machine can thus operate in all four quadrants in the same manner with respect to the flow conditions in the two fluid channels.

In a preferred embodiment of the axial piston machine, the first kidney-shaped control structure is configured above the rotation axis of the cylinder drum relative to the mounting surface and the second kidney-shaped control structure is configured below the rotation axis of the cylinder drum relative to the mounting surface. In this view, it is assumed that the axial piston machine stands on the mounting surface. The second fluid channel leading to the second kidney-shaped control structure is then slightly shorter than the first fluid channel leading to the first kidney-shaped control structure.

It is further preferred that the first fluid channel and the second fluid channel are at least partially arc-shaped in the first and/or second housing part.

These curved fluid channels in the housing part can be produced, for example, by a corresponding casting core with the aid of a casting method. The casting core is then removed from the casting/housing part by destroying the casting core after casting. Alternatively, an additive manufacturing method such as a 3D printing method can also be used to produce the housing part, in which case such curved fluid channels can also be produced without further measures. Usually, straight fluid channels are subsequently processed by drilling holes in the housing part. Curved fluid channels have a smaller flow resistance than sharp turns between two straight fluid channels.

BRIEF DESCRIPTION OF THE DRAWINGS

Preferred embodiments are described in more detail below with reference to the accompanying drawings.

FIG. 1 a schematically shows a first embodiment of an axial piston machine in a three-dimensional view of a flange of the axial piston machine;

FIG. 1 b schematically shows a first embodiment of an axial piston machine in a three-dimensional view of the attachment surface of the axial piston machine;

FIG. 1 c schematically shows a first housing part of a first embodiment of an axial piston machine in a three-dimensional view of a joining surface of the first housing part;

1d schematically shows a second housing part of a first embodiment of the axial piston machine in a three-dimensional view of the control surface of the second housing part;

1 e schematically shows, in a side view looking into the longitudinal side of the axial piston machine, the fluid channels and the pre-compression volume of a first embodiment of an axial piston machine with a housing part shown transparently;

1 f schematically shows, in a side view looking at the end side of the second housing part, the fluid channels and the pre-compression volume of a first embodiment of an axial piston machine with a housing part shown transparently;

FIG. 2 a schematically shows a second embodiment of an axial piston machine in a three-dimensional view of a flange of the axial piston machine;

FIG. 2 b schematically shows a second embodiment of the axial piston machine in a three-dimensional view of the attachment surface of the axial piston machine;

FIG. 2 c schematically shows a first housing part of a second embodiment of an axial piston machine in a three-dimensional view of the joining surface of the first housing part;

FIG. 2 d schematically shows a second housing part of a second embodiment of the axial piston machine in a three-dimensional view of the control surface of the second housing part;

2 e schematically shows, in a three-dimensional view of a second housing part of the axial piston machine, a fluid channel and a pre-compression volume of a second embodiment of an axial piston machine with a housing part shown transparently;

FIG. 2 f schematically shows, in a side view looking at the end face of the second housing part, the fluid channels and the pre-compression volume of a second specific embodiment of an axial piston machine with a housing part shown transparently.

DETAILED DESCRIPTION

The axial piston machine 1 has a housing 2 according to each of its two embodiments in FIGS. 1a to 2f etc., which comprises a first and a second housing part 2.1, 2.2. The first housing part 2.1 is designed in a pot-like manner and has a flat joint surface 3 at the open end, which surrounds the interior space 4 of the housing 2 in an annular manner. FIGS. 1a, 1b, 2a and 2b show the two housing parts 2.1 and 2.2 in the assembled state in particular. The joint surface 3 can be seen in particular from FIGS. 1.c and 2.c.

The cylinder drum 5 is accommodated in the first housing part 2.1 in a manner that allows rotation relative to the rotation axis L. A plurality of cylinders configured as bores are provided in the cylinder drum 5, in each of which a piston is guided. The individual pistons are connected to the swash plate of the swivel cradle by means of so-called sliding shoes. The inclination of the swivel cradle can be adjusted relative to the cylinder drum 5 in order to set the stroke of the piston. When the axial piston machine 1 is operated as a motor, the displacement and thus the output speed of the cylinder drum 5 can be set with this adjustment of the swivel cradle. When the axial piston machine 1 is operated as a pump, the delivery volume can be set with this adjustment of the swivel cradle.

The second housing part 2.2 is fluid-tightly attached to the joint surface 3 on the entire periphery of the joint surface when forming a sealing engagement structure. Therefore, fluid flow cannot be achieved in the sealing engagement structure adjacent to the joint surface 3. The second housing part 2.2 or a separate distribution plate 6 fixed at the second housing part 2.2 forms a control surface 7 with first and second kidney-shaped control structures 7.1, 7.2. The cylinder drum 5 is supported at the control surface 7 in the direction of the rotation axis L. During pump operation, the cylinder drum 5 rotates and the piston moves axially. Due to the axial movement of the piston, the fluid is sucked out from one kidney-shaped control structure 7.1 or 7.2 and discharged into the other kidney-shaped control structure 7.2 or 7.1 of the two kidney-shaped control structures. During motor operation, a pressure difference is applied between the two kidney-shaped control structures 7.1, 7.2. By increasing the pressure at one of the kidney-shaped control structures 7.1 or 7.2, the piston is pressed away from the control surface 7 in this kidney-shaped control structure 7.1 or 7.2 and the cylinder drum 5 rotates accordingly.

According to two embodiments, the first housing part 2.1 has an attachment surface 8, in which the first and second working connections 9.1, 9.2 are arranged. The first fluid channel 10.1 is guided from the first working connection 9.1 through the joint surface 3 toward the first kidney-shaped control structure 7.1. The second fluid channel 10.2 is guided from the second working connection 9.2 through the joint surface 3 toward the second kidney-shaped control structure 7.2. The joint surface 3 surrounds the first and second three-dimensional channels 10.1, 10.2 respectively on its entire peripheral surface, so that the sealing interlocking structure surrounds the first fluid channel and the second fluid channel 10.1, 10.2 respectively in a fluid-tight manner. This prevents the fluid from flowing out of the two fluid channels 10.1, 10.2 between the two housing parts 2.1, 2.2 into the interior space 4 of the axial piston machine 1 and/or the surrounding environment. The housing 2 has two housing parts 2.1, 2.2 in order to be able to accommodate the cylinder drum 5 and further components such as a pivot cradle in the interior 4 of the axial piston machine 1 and subsequently to close the interior 4 by assembling the two housing parts 2.1, 2.2.

According to Figures 1b and 2b, an oil leakage connection 11 is arranged in the attachment surface 8, and the oil leakage connection leads to the inner space 4 via a leakage oil channel 12. The leakage oil channel 12 is therefore constructed only in the first housing part 2.1. The (leaking) fluid coming out of the cylinder of the cylinder drum 5 enters the inner space 4 during the operation of the axial piston machine 1 and can then be conveyed to the feed box, for example, via the leakage oil channel 12 and the leakage oil connection 11. The leakage oil connection 11 is arranged on a central plane of the axial piston machine 1 that passes through the rotation axis L of the cylinder drum 5 and extends perpendicularly to the attachment surface 8 according to the first embodiment of the axial piston machine 1 of Figure 1b. The central plane of the axial piston machine 1 that passes through the rotation axis L of the cylinder drum 5 and extends perpendicularly to the attachment surface 8 intersects with the leakage oil connection 11 according to the second embodiment of the axial piston machine 1 of Figure 2b.

According to the second embodiment of the axial piston machine 1 according to FIGS. 2a to 2f, the regulating valve supply channel 13 leads from the first fluid channel or the second fluid channel 10.1, 10.2 through the joint surface 3 to the regulating valve 14 of the axial piston machine 1. The joint surface 3 surrounds the regulating valve supply channel 13 on the entire periphery of the regulating valve supply channel, as shown in particular in FIG. 2c, so that the sealing engagement structure surrounds the regulating valve supply channel 13 in a fluid-tight manner. The regulating valve 14 of the second embodiment of the axial piston machine 1 is therefore designed as a hydraulic regulating valve 14 and is connected to the housing 2 in the area of the second housing part 2.2. According to FIG. 2d, two servo cylinders fluidically connected to the regulating valve 14 are arranged one above the control surface 7 and one below the control surface 7 for adjusting the inclination of the swivel cradle of the axial piston machine 1.

Alternatively, it is conceivable that, according to a second embodiment of the axial piston machine 1, an adjustment pressure connection 15 is arranged in the mounting surface 8, wherein the adjustment valve supply channel 13 is guided from the adjustment pressure connection 15 through the joint surface 3 toward the adjustment valve 14 of the axial piston machine 1, and the joint surface 3 surrounds the adjustment valve supply channel over its entire periphery, so that the sealing engagement surrounds the adjustment valve in a fluid-tight manner. The adjustment pressure connection 15 is prepared accordingly, but according to FIG. 2b is not connected to the adjustment valve supply channel 13. However, this preparation makes it possible to choose between two variants with particularly little effort, namely, either the fluid is supplied to the adjustment valve 14 from the fluid channels 10.1, 10.2 or it is supplied from the outside via the adjustment pressure connection 15.

According to a first embodiment of the axial piston machine 1, as shown in particular in FIG. 1a, the regulating valve 14 is connected to the housing 2 in the region of the first housing part 2.1. The regulating valve supply channel 13 is then guided only through the first housing part 2.1 and does not pass through the joint surface 3. The regulating valve supply channel 13 is formed by means of a borehole made in the first housing part 2.1, which is closed to the outside adjacent to the regulating valve 14 and in the region of the regulating pressure connection 15 for forming the regulating valve supply channel 13 with a corresponding plug.

According to FIG. 1 b , a bearing flushing connection 16 is arranged in the attachment surface 8 , wherein a bearing flushing channel is guided from the bearing flushing connection 16 to a bearing of a shaft 19 of the axial piston machine 1 which is connected rotationally fixedly to the cylinder drum 5 and faces away from the second housing part 2 . 2 .

It is also conceivable that the bearing flushing channel is guided from the bearing flushing joint 16 through the joint surface 3 toward the bearing 18 of the shaft 19 of the axial piston machine 1 which is rotationally connected to the cylinder drum 5, and that the joint surface 3 surrounds the bearing flushing channel on its entire circumference so that the sealing engagement structure surrounds the bearing flushing channel in a fluid-tight manner.

According to a second embodiment and as shown in FIGS. 2c to 2f , a bearing flushing channel 17 is guided from the interior space 4 through the joint surface 3 toward a bearing 18 of a shaft of the axial piston machine 1 which is connected in a rotationally fixed manner to the cylinder drum 5 . The joint surface 3 surrounds this bearing flushing channel 17 over its entire periphery, so that the sealing engagement surrounds the bearing flushing channel 17 in a fluid-tight manner. According to a second embodiment, two such bearing flushing channels 17 are provided. The (leakage) fluid collected in the interior space 4 can thus be used to cool and/or lubricate the bearing 18. The shape of the bearing flushing channel 17 can be seen in particular from the partially transparent views of the housing 2 in FIGS. 2e and 2f , wherein the bearing flushing channel 17 itself is symbolically represented by a solid line and the housing 2 is symbolically represented by a dotted line.

According to Figures 1b and 2b, at least one fixing interface 20 is arranged and/or constructed in the attachment surface 8, and at least one fixing interface is constructed for connecting with a fixing device, so that the first housing part 2.1 can be connected to the hydraulic assembly by means of the fixing device. In particular, heavy-duty clamping pins and bolts are used as fixing devices, wherein a plurality of fixing interfaces 20 configured as blind drilled holes are arranged in the attachment surface 8 to accommodate each heavy-duty clamping pin or bolt. The heavy-duty clamping pins are used in particular to align the components to be connected with each other. The fixing interface 20 is especially arranged and constructed at two end regions of the attachment surface 8 extending parallel to the rotation axis L and opposite to each other. Fluid connections, such as two working connections 9.1, 9.2, leakage oil connection 11, adjustment pressure connection 15 and/or bearing flushing connection 16 are located between the two end regions formed by the fixing interfaces 20. Therefore, the sealing of these fluid connections, for example relative to the hydraulic assembly, is facilitated.

In the sealing engagement structure, at least one annular sealing structure 21 is provided, which is arranged in a groove 22 circumferentially in the joint surface 3 according to FIG. 2c, and the groove preferably surrounds the interior space 4 of the housing 2, the first fluid channel 10.1, the second fluid channel 10.2 in an annular manner. The regulating valve supply channel 13 and/or the bearing flushing channel 17. According to FIG. 2c, four annular sealing structures 21 with associated grooves 22 are provided, one groove each for the interior space 4, the first fluid channel 10.1, the second fluid channel 10.2 and the regulating valve supply channel 13. The bearing flushing channel 17 branching off from the interior space 4 is also sealed against the interior space 4 by means of the annular sealing structure 21.

As shown in FIGS. 1c and 1d, it is also conceivable that the groove 22 belonging to the annular sealing structure 21 is not machined into the first housing part 2.1, but into the second housing part 2.2, which itself rests against the joint surface 3 in a fluid-tight manner over the entire periphery of the joint surface, forming a sealing engagement structure. Therefore, it is irrelevant to the sealing effect whether the groove 22 is machined in the first housing part 2.1 or in the second housing part 2.2. According to FIG. 1d, each annular sealing structure 21 and the associated groove 22 are arranged around each of the two fluid channels 10.1, 10.2. The annular sealing structure 21 that seals the inner space 4 rests on the outer periphery of the distribution plate 6 that at least partially extends from the second housing part 2.2 into the inner space 4.

Alternatively, it is conceivable to provide a flat seal in the sealing engagement, which bears against the joining surface and has respective recesses for the interior of the housing, the first fluid channel, the second fluid channel, in particular the regulating valve supply channel and in particular the bearing flushing channel.

The first and second housing parts 2.1, 2.2 can also be connected to one another by means of a fixing interface and associated fixing means such as heavy-duty clamping pins, bolts, nuts and/or screws.

The first housing part 2 . 1 is designed in one piece and has a flange 23 oriented essentially perpendicularly to the attachment surface 8 for connecting an electric motor or another axial piston pump.

The shaft 19 protrudes from the first housing part 2.1 and the second housing part 2.2, in particular with external toothing, so that the shaft 19 can be connected to an electric motor or another axial piston pump in a rotationally fixed manner. The shaft 10 here protrudes so far from the respective housing part 2.1, 2.2 that a standard motor can be connected to an internally toothed drive shaft flange or by means of a clutch, and another axial piston pump can be connected to the shaft 19 with a standardized coupling connection. The shaft 19 is not freely accessible in the area of the second housing part 2.2, but a plane extending perpendicularly to the axis of rotation L and through the end side of the shaft 19 also intersects the second housing part 2.2. However, the housing part 2.2 is designed in such a way that there is sufficient space around the shaft 19 outside the housing 2 for the standardized connection described.

The first and second kidney-shaped control structures 7.1, 7.2 are designed essentially mirror-symmetrically with respect to a plane arranged parallel to the joint surface 3. The shape of the kidney-shaped control structures 7.1, 7.2 can be seen in particular from the partially transparent views of the housing 2 in FIGS. 1e, 1f, 2e and 2f, wherein the kidney-shaped control structures 7.1, 7.2 themselves and the associated fluid channels 10.1, 10.2 are symbolically shown with solid lines and the housing 2 is symbolically shown with dashed-dotted lines.

According to both embodiments of the axial piston machine 1, the first working connection 9.1 is arranged on a first side of a central plane of the axial piston machine 1 extending through the rotation axis L of the cylinder drum 5 and perpendicular to the attachment surface 8. The second working connection 9.2 is arranged on a second side of this central plane opposite the first side. The first fluid channel 10.1 penetrates the joint surface 3 in a first corner region 24.1 on the first side of the central plane, and the second fluid channel 10.2 penetrates the joint surface 3 in a second corner region 24.2 on the second side of the central plane.

According to a second exemplary embodiment of an axial piston machine 1 , as shown in particular in FIGS. 2 d and 2 f , the first kidney-shaped control structure 7 . 1 is formed on a first side of the central plane and the second kidney-shaped control structure 7 . 2 is formed on a second side of the central plane.

According to a first embodiment of the axial piston machine 1, as shown in particular in Figures 1d and 1e, the first kidney-shaped control structure 7.1 is constructed above the rotation axis L of the cylinder drum 5 with respect to the attachment surface 8 and the second kidney-shaped control structure 7.2 is constructed below the rotation axis L of the cylinder drum 5 with respect to the attachment surface 8.

The first fluid channel 10.1 and the second fluid channel 10.2 are at least partially arcuately configured in the first and/or second housing part 2.1, 2.2. These arcuate fluid channels 10.1, 10.2 are produced, for example, with a casting core during a casting method. The arcuate shape is designed to facilitate flow, so that dead zones and correspondingly increased flow losses are avoided.

The partially transparent illustrations of the housing 2 according to Figures 1e, 1f, 2e and 2f, shown with dotted lines, show four pre-compression volumes 25 in addition to the fluid channels 10.1, 10.2 and kidney-shaped control structures 7.1, 7.1 shown with solid lines. Each pre-compression volume 25 is designed by means of a cavity formed in the second housing part 2.2. Each pre-compression volume 25 has a connecting channel to the control surface 7, which leads to the control surface 7 adjacent to the kidney-shaped control structure 7.1, 7.1. One of the connecting channel confluences in the connecting channels is arranged adjacent to each end region of the kidney-shaped control structure 7.1, 7.1, as shown in particular in Figure 2d. With the help of the pre-compression volume 25, the pressure peak in the cylinder of the cylinder drum 5 can be reduced, so that a constant speed of the cylinder drum 5 with small speed fluctuations can be achieved during the operation of the axial piston machine 1. The pre-compression volume 25 can also be generated, for example, during the casting method using the relevant casting core. The pre-compression volume 25 is preferably arranged mirror-symmetrically with respect to the central plane.

Reference numerals list

1 Axial piston machine

2 Housing

2.1 First shell part

2.2 Second shell part

3 Joint surface

4. Internal Space

5 cylinder roller

6 Distribution board

7 Control Surface

7.1 The first kidney-shaped control structure

7.2 Second kidney-shaped control structure

8 Attachment surface

9.1 First working joint

9.2 Second working joint

10.1 First fluid channel

10.2 Second Fluid Channel

11 Oil leakage joint

12 Oil leak channel

13 Adjustment valve supply passage

14 Adjustment valve

15 Adjust the pressure fitting

16 Bearing flushing connector

17 Bearing flushing channel

18 Bearings

19 Shaft of axial piston machine 1

20 Fixed interface

21. Annular sealing structure

22 slots

23 Flange

24.1 First corner area

24.2 Second Corner Area

25 Pre-compression volume

L Rotation axis

Claims (15)

1. An axial piston machine (1) with a housing (2), the housing comprising a first housing part and a second housing part (2.1, 2.2), wherein the first housing part (2.1) is designed in the shape of a pot and has a flat joint surface (3) at the open end, the flat joint surface annularly surrounding the interior space (4) of the housing (2), wherein a cylinder drum (5) is accommodated in the first housing part (2.1) in a manner rotatable about an axis of rotation (L), wherein the second housing part (2.2) bears against the joint surface (3) in a fluid-tight manner over the entire circumference of the joint surface while forming a sealing engagement structure, wherein the second housing part (2.2) or a separate distribution plate (6) fixed to the second housing part (2.2) forms a control surface (7) with a first and a second kidney-shaped control structure (7.1, 7.2), wherein the cylinder drum (5 ) is supported at the control surface (7) along the direction of the rotation axis (L), characterized in that the first housing part (2.1) has an attachment surface (8), in which the first and second working joints (9.1, 9.2) are arranged, wherein the first fluid channel (10.1) is guided from the first working joint (9.1) through the joint surface (3) toward the first kidney-shaped control structure (7.1), wherein the second fluid channel (10.2) is guided from the second working joint (9.2) through the joint surface (3) toward the second kidney-shaped control structure (7.2), and the joint surface (3) surrounds the first fluid channel and the second fluid channel (10.1, 10.2) respectively on the entire periphery of the first fluid channel and the second fluid channel, so that the sealing interlocking structure surrounds the first fluid channel and the second fluid channel (10.1, 10.2) respectively in a fluid-tight manner. 2. The axial piston machine (1) according to claim 1, characterized in that an oil leakage joint (11) is arranged in the mounting surface (8), and the oil leakage joint leads to the internal space (4) through an oil leakage channel (12). 3. An axial piston machine (1) according to any one of the preceding claims, characterized in that an adjusting valve supply channel (13) is guided from the first fluid channel or the second fluid channel (10.1, 10.2) through the joining surface (3) toward the adjusting valve (14) of the axial piston machine (1), and the joining surface (3) surrounds the adjusting valve supply channel (13) on the entire periphery of the adjusting valve supply channel, so that the sealing embedding structure surrounds the adjusting valve supply channel (13) in a fluid-tight manner. 4. An axial piston machine (1) according to any one of claims 1 to 2, characterized in that an adjustment pressure connection (15) is arranged in the attachment surface (8), wherein the adjustment valve supply channel (13) is guided from the adjustment pressure connection (15) through the joint surface (3) toward the adjustment valve (14) of the axial piston machine (1), and the joint surface (3) surrounds the adjustment valve supply channel (13) on the entire periphery of the adjustment valve supply channel, so that the sealing embedding structure surrounds the adjustment valve supply channel (13) in a fluid-tight manner. 5. An axial piston machine (1) according to any one of the preceding claims, characterized in that a bearing flushing joint (16) is arranged in the attachment surface (8), wherein a bearing flushing channel (17) is guided from the bearing flushing joint (16) through the joint surface (3) toward a bearing (18) of a shaft (19) of the axial piston machine (1) which is rotationally connected to the cylinder drum (5), and the joint surface (3) surrounds the bearing flushing channel (17) on the entire circumference of the bearing flushing channel so that the sealing embedding structure surrounds the bearing flushing channel (17) in a fluid-tight manner. 6. An axial piston machine (1) according to any one of the preceding claims, characterized in that at least one fixed interface (20) is arranged and/or constructed in the attachment surface (8), and the at least one fixed interface is constructed for connection with a fixing device so that the first housing part (2.1) can be connected to the hydraulic assembly by means of the fixing device. 7. An axial piston machine (1) according to any of the preceding claims, characterized in that at least one annular sealing structure (21) is provided in the sealing embedding structure, and the annular sealing structure is arranged in a groove (22) circumferentially in the joining surface (3), and the groove preferably annularly surrounds the interior space (4) of the housing (2), the first fluid channel (10.1), the second fluid channel (10.2), the regulating valve supply channel (13) and/or the bearing flushing channel (17), and/or wherein a planar sealing structure abutting the joining surface is provided in the sealing embedding structure, and the planar sealing structure respectively has recesses for the interior space of the housing, the first fluid channel, the second fluid channel, in particular the regulating valve supply channel and in particular the bearing flushing channel. 8. The axial piston machine (1) according to any of the preceding claims, characterized in that the first housing part (2.1) is designed as a single piece and has a flange (23) oriented essentially perpendicular to the attachment surface (8) for connecting an electric motor or another axial piston machine. 9. An axial piston machine (1) according to any one of claims 5 to 8, characterized in that the shaft (19) extends from the first housing part (2.1) and the second housing part (2.2), in particular with external gearing, so that the shaft (19) can be connected to the electric motor or another axial piston machine in a rotationally fixed manner. 10. The axial piston machine (1) according to claim 1, characterized in that the first and second kidney-shaped control structures (7.1, 7.2) are designed essentially mirror-symmetrically with respect to a plane arranged parallel to the joining surface (3). 11. An axial piston machine (1) according to any one of the preceding claims, characterized in that the first working joint (9.1) is arranged on a first side of a central plane of the axial piston machine (1) extending along the rotation axis (L) of the cylinder drum (5) and perpendicular to the attachment surface (8), and the second working joint (9.2) is arranged on a second side of the central plane opposite to the first side. 12. An axial piston machine (1) according to any of the preceding claims, characterized in that the first fluid channel (10.1) penetrates the joining surface (3) in a first corner area (24.1) on a first side of the central plane or a central plane extending perpendicular to the attachment surface (8), and the second fluid channel (10.2) penetrates the joining surface (3) in a second corner area (24.2) on a second side of the central plane. 13. An axial piston machine (1) according to any of the preceding claims, characterized in that the first kidney-shaped control structure (7.1) is constructed on a first side of the central plane or a central plane extending perpendicular to the attachment surface (8) and the second kidney-shaped control structure (7.2) is constructed on a second side of the central plane or a central plane extending perpendicular to the attachment surface (8). 14. An axial piston machine (1) according to any one of claims 1 to 12, characterized in that the first kidney-shaped control structure (7.1) is constructed on the side of the rotation axis (L) of the cylinder drum (5) facing the attachment surface (8) and the second kidney-shaped control structure (7.2) is constructed on the side of the rotation axis (L) of the cylinder drum (5) facing away from the attachment surface (8). 15. The axial piston machine (1) according to any one of the preceding claims, characterized in that the first fluid channel (10.1) and the second fluid channel (10.2) are at least partially arcuately constructed in the first and/or second housing part (2.1, 2.2).