Axial piston machine with individual pre-compression structures

Abstract

The invention relates to an axial piston machine having a separate pre-compression assembly (50), which comprises a pre-compression chamber (53) and a first through-hole (65). According to the invention, the pre-compression chamber (53) comprises a first sub-chamber and a separate second sub-chamber (61; 62) which are permanently fluidically connected to one another by means of a second connection channel (52), a first through-hole (65) being arranged between the first and second sub-chambers (61; 62), and wherein the second connection channel (52) extends at a distance through the first perforation (65).

Description

Technical Field

[0001] The present invention relates to an axial piston machine according to the preamble of claim 1. Background Technology

[0002] An axial piston machine is known from DE 10 2022 202 520 A1, in which a separate pre-compression structure assembly is installed at the housing of the axial piston machine. The pre-compression structure assembly includes a pre-compression chamber that can enter into fluid exchange connection with the cylinder chamber of the axial piston machine when the manifold opening of the cylinder chamber is located in the reversing region of the axial piston machine. The pre-compression structure assembly has a base including a first perforation oriented in alignment with the working interface at the housing of the axial piston machine.

[0003] An axial piston machine is known from EP 2 104 786 B1, which includes a working interface with a flat, corresponding abutment surface oriented at 45° relative to the pivot axis of a pivoting cradle. If a pre-compression structural assembly according to DE 102022 202 520 A1 is fastened there, the pre-compression structural assembly will extend far from the housing. Summary of the Invention

[0004] The object of the present invention is to provide a pre-compression structural assembly that abuts against the housing of an axial piston machine, particularly when the pre-compression structural assembly is fastened at a working interface that is tilted relative to the pivot axis.

[0005] According to claim 1, the pre-compression chamber includes a first sub-chamber and a separate second sub-chamber, the first and second sub-chambers being permanently fluidly connected to each other via a second connecting channel, wherein a first perforation is arranged between the first and second sub-chambers, and wherein the second connecting channel extends through the first perforation at a distance.

[0006] Advantageous modifications and improvements of the invention are specified in the dependent claims.

[0007] It can be specified that the first and second sub-chambers are constructed identically to each other. Therefore, the pre-compression structure assembly can be manufactured particularly easily. This pre-compression structure assembly can be constructed substantially mirror-symmetrically, so that there is no difference whether the associated tilt-oriented working interface is arranged on the left or right side of the axial piston mechanism.

[0008] It can be specified that the precompression structural assembly includes a one-piece base that abuts against a corresponding flat abutment surface on the housing, wherein a first through-hole is fully disposed within the base and extends out at the abutment surface, and a second connecting channel is fully disposed within the base. Therefore, the base is the only component of the precompression structural assembly that must be manufactured separately. All other components of the precompression structural assembly are standard parts or readily available on the market. Therefore, the precompression structural assembly is particularly inexpensive.

[0009] It can be specified that the first and second sub-chambers each comprise cylindrical sections, wherein the cylindrical sections are formed directly from the matrix, and wherein each cylindrical section is closed at its end using at least one first closing thread, wherein the two cylindrical sections are arranged parallel to each other. Preferably, the first and / or second sub-chambers are constructed as blind holes, such that only one end must be closed with a first closing thread. However, they can also be constructed as through holes, wherein both opposing end sides are closed with first closing threads.

[0010] It can be specified that the two cylindrical sections are arranged parallel to the abutment surface. Therefore, the pre-compression structure assembly is particularly tightly abutted against the housing, especially when the relevant working interface is arranged at an angle relative to the pivot axis. Preferably, the cylindrical sections are oriented parallel to the rotation axis of the axial piston.

[0011] It can be specified that the first or second thickness of the substrate is measured perpendicular to the abutment surface, wherein the first thickness in the region of the first perforation is less than the second thickness in the region of the first or second sub-chamber. Therefore, the first thickness can be designed to be particularly small, such that the connection dimensions of the axial piston machine with the pre-compression structure assembly differ only slightly from those of the axial piston machine without the pre-compression structure assembly.

[0012] It can be specified that the substrate has a constant first thickness in the region of the first perforation, and a constant second thickness in the regions of the first and second sub-chambers. Correspondingly, the surface facing the abutment is flat and parallel to the abutment surface. Therefore, this surface can be easily manufactured. A geometry corresponding to a standardized interface, particularly an SAE interface, is produced in the region of the first thickness.

[0013] It can be specified that the second connecting channel is cylindrically constructed, wherein the second connecting channel is closed at at least one end using a second closing thread. Therefore, the second connecting channel can be provided in a cost-effective manner through a single straight hole.

[0014] It can be specified that the second connecting channel extends perpendicular to the two cylindrical sections and parallel to the abutment surface. This results in a particularly compact pre-compressed structural assembly.

[0015] It can be specified that the axial piston machine includes a pivoting rocker arm capable of pivoting about a pivot axis, by means of which the displacement volume of the axial piston machine can be adjusted, wherein the pivot axis is oriented perpendicular to the rotation axis, wherein the corresponding abutment surface is arranged parallel to the rotation axis, and wherein the corresponding abutment surface is arranged at an angle between 30° and 60°, preferably 45°, relative to the pivot axis. It is precisely in this structural form of the axial piston machine that the advantages of the pre-compression structural assembly according to the invention are particularly evident.

[0016] It can be specified that the first connecting channel extends through the area where the abutment surface contacts the corresponding abutment surface, wherein the first connecting channel only leads into the first sub-chamber. Therefore, the first connecting channel, which is composed of only a few straight holes not only in the base but also in the shell, can be guided particularly easily.

[0017] It goes without saying that the features mentioned above and those to be described below can be used not only in their respective combinations, but also in other combinations or individually, without departing from the scope of the invention. Attached Figure Description

[0018] The invention will now be explained in more detail with reference to the accompanying drawings. Wherein:

[0019] Figure 1 A longitudinal sectional view of an axial piston machine according to the present invention is shown;

[0020] Figure 2 It shows that according to Figure 1 A three-dimensional view of an axial piston engine;

[0021] Figure 3 A perspective view of the substrate of the pre-compressed structure assembly is shown;

[0022] Figure 4 A perspective sectional view of the pre-compression structure assembly 50 is shown;

[0023] Figure 5 A cross-sectional view of the first housing component is shown; and

[0024] Figure 6 A perspective view of the control panel as seen from the control surface is shown. Detailed Implementation

[0025] Figure 1A longitudinal sectional view of an axial piston machine 10 according to the invention is shown. The axial piston machine 10 includes a housing 30 having a first housing component and a second housing component 33; 34. The first housing component 33 is canister-shaped, wherein corresponding openings are covered by the second housing component 34, thereby creating a closed internal space. In the housing 30, a drive shaft 13 is rotatably supported relative to a rotation axis 11, more specifically by means of two rotary bearings 35, which are currently constructed as roller bearings. The drive shaft 13 extends from the housing 30 with a drive shaft head 14.

[0026] The drive shaft 13 is surrounded by a cylinder 20, which is anti-rotatably connected to the drive shaft 13 relative to the axis of rotation 11, for example, by means of splined shaft teeth. A plurality of pistons 21, for example nine, are linearly movably accommodated in the cylinder 20, such that each piston, together with the cylinder 20, defines a cylinder chamber 22. A corresponding control surface 25 of the cylinder 20, pointing along the axis of rotation 11, abuts against a control surface 43, which is fixed in position relative to the housing 30. The control surface 43 is currently arranged at a separate control plate 40. Each cylinder chamber 22 exits through a correspondingly associated manifold opening 26 at the corresponding control surface 25. The corresponding control surfaces 25 and 43 are fluid-tightly fitted together, wherein the corresponding control surfaces are currently spherically constructed, but can also be constructed flat.

[0027] Pistons 21 extend from cylinder 20 along the axis of rotation 11, where they are connected to slippers 23 via ball joints. Slippers 23 abut against a surface that can rotate relative to the pivot axis (…). Figure 2 (See attached figure 12) The pivoting cradle 24, wherein the pivoting axis is perpendicular to... Figure 1 The plane is therefore oriented perpendicular to the axis of rotation 11.

[0028] The current axial piston press 10 has a fixed pressure side, and the present invention can also be used for axial piston presses with a variable pressure side. The second working port 32 is currently a low-pressure port. Pressure fluid, particularly hydraulic oil, is drawn in from there. An optional supply pump 15 in the form of an impeller is currently provided, which delivers the drawn-in pressure fluid to the second control port (…). Figure 6 (See figure 42).

[0029] It should also be noted that the regulating valve 16 is used to control the regulating cylinder 27, which in turn causes the pivoting rocker arm 24 to pivot.

[0030] Figure 2 It shows that according to Figure 1A perspective view of the axial piston press 10. A notable feature of the current axial piston press 10 is that the first working interface 31 is arranged at a 45° angle relative to the pivot axis 12. Because the axial piston press 10 does not have a pre-compression chamber integrated into the housing 20, an external pre-compression chamber should be installed there within the scope of this invention. The corresponding pre-compression structure assembly 50 is constructed in a particularly space-saving manner.

[0031] The pre-compression structural assembly 50 includes a one-piece base 60. The base 60 has a circular first through-hole 65 that extends aligned with the first working interface 31. Two second through-holes 66, currently configured as countersunk holes, are arranged on opposite sides adjacent to the first through-hole 65. Each of the second through-holes 66 is penetrated by a fastening thread 54, currently configured as a countersunk bolt. The base 60 is clamped to a flat, corresponding abutment surface using the two fastening threads 54. Figure 5 As shown by reference numeral 36 in the attached drawing, a fastening threaded part is screwed into the housing 30. Furthermore, four circular third through holes 67 are arranged around the first through hole 65, these third through holes aligningly continuing the corresponding fastening threaded portion at the first working interface 31. It should be noted that the first working interface 31 is constructed as a standardized SAE interface. The flat surface 69 at the base 60 forms a connection structure compatible with the first working interface 31 directly disposed at the housing 30.

[0032] Figure 3 A perspective view of the base 60 of the pre-compression structural assembly is shown, more specifically, a perspective view from the flat abutment surface 68, with which the base 60 abuts against a corresponding abutment surface at the housing. Figure 5 At reference numeral 36 in the attached figure. A flat surface 69 is arranged parallel to the abutment surface 68 according to a constant first thickness 75. In the region of the abutment surface 68, a first perforation 65 is surrounded by a first sealing ring 73, preventing pressurized fluid from flowing out there. It should be noted here that the corresponding first working interface currently guides high pressure.

[0033] Furthermore, the first connecting channel 51 penetrates the abutment surface 68 and the corresponding abutment surface ( Figure 5 The contact portion between reference numerals 36 in the attached figure. Because the first connecting channel 51 can also guide high pressure, the first connecting channel 51 is surrounded by the second sealing ring 74 in the area of ​​the abutment surface 68.

[0034] In addition, Figure 3The first and second sub-chambers 61 and 62 are visible, together forming a pre-compression chamber 53. A first perforation 65 is disposed between the first and second sub-chambers 61 and 62. In the region of the first and second sub-chambers 61 and 62, the substrate 60 has a constant second thickness 76, which is designed to be greater than the first thickness 75, so that the volume of the pre-compression chamber 53 has a desired value.

[0035] Figure 4 A perspective sectional view of the pre-compression structural assembly 50 is shown. The cutting plane is parallel to the abutment surface. Figure 3 Reference numeral 68) extends and centrally passes through the second connecting channel 52. The second connecting channel 52 is cylindrically constructed, wherein the second connecting channel is parallel to the abutment surface ( Figure 3 (See attached figure 68) and perpendicular to the axis of rotation ( Figure 1 Reference numeral 11) indicates orientation. This second connection channel is in... Figure 3 It is drilled from below, and the corresponding opening is closed by the second closing threaded part 72.

[0036] The first and second sub-chambers 61 and 62 are constructed identically to each other. Each of the first and second sub-chambers includes a cylindrical segment 63, the central axis of which is parallel to the abutment surface. Figure 3 Reference numeral 68 in the attached figure) and oriented parallel to the axis of rotation. The first and second sub-chambers 61 and 62 are each constructed as blind holes. A first connecting channel 51 permanently connects the first and second sub-chambers 61 and 62 to each other, more precisely, in the bottom region of the aforementioned blind holes. The open sides of the blind holes are respectively provided with internal threads 64, into which first closing threaded members 71 are screwed, thereby fluid-tightly sealing the pre-compression chamber 53. The only opening of the pre-compression chamber 53 is formed by the first connecting channel 51, which directly merges into the first sub-chamber 61. The corresponding merging location is in Figure 4 It is not shown because the confluence location is in Figure 4 The first connecting channel 51 is cylindrical or constructed as a straight hole in the region of the substrate 60.

[0037] Figure 5 A cross-sectional view of the first housing component 33 is shown, wherein the cutting plane is oriented perpendicular to the axis of rotation, and wherein the cutting plane is arranged slightly in front of the support surface 80. (Control panel) Figure 1Reference numeral 40) rests against a flat support surface 80. The support surface 80 is oriented perpendicular to the axis of rotation 11. Currently, three first confluence openings 84 are arranged in the support surface 80, which are permanently connected to a first working interface 31 via a working channel 83. The first working interface 31 includes a flat corresponding abutment surface 36, which is currently arranged relative to the pivot axis (…). Figure 2 Reference numeral 12) is tilted at 45°. The second working interface 32 is connected to the kidney-shaped second manifold opening 85. Because a low pressure is applied here, a single large second manifold opening 85 can be used. A high pressure is applied in the first manifold opening 84, therefore, for component strength, multiple small first manifold openings 84 are preferred.

[0038] A first drill hole 81, extending parallel to the axis of rotation 11, is located at the support surface 80. This first drill hole is a component of the first connecting channel 51. The first connecting channel 51 extends in a straight line from the bottom of the first drill hole 81, which is implemented as a blind hole, to the corresponding abutment surface 36.

[0039] The second drill hole 82 is also oriented parallel to the rotation axis 11, and extends through the support surface 80. A cylindrical pin is received there, which is used to engage the control panel in a form-locking manner. Figure 1 The reference numeral 40 in the attached diagram is used to stop it from rotating about the axis of rotation 11. In the radial direction, the control plate ( Figure 1 The reference numeral 40 in the attached figure can be held at the adjacent rotating bearing.

[0040] Figure 6 A perspective view of the control plate 40 as seen from the control surface 43 is shown. The control surface 43 is constructed in a convex spherical shape, wherein the center point of the corresponding sphere coincides with the rotation axis 11. A kidney-shaped second control opening 42 is formed by a perforation in the control plate 40, which is relative to the second confluence opening ( Figure 5 The reference numerals 85 in the attached figures are aligned. A kidney-shaped first control opening 41 is formed by a recess in the control plate 40. At the bottom of the recess, three additional perforations are arranged in the control plate 40, these additional perforations being respectively aligned with the associated first confluence opening (…). Figure 5 The reference numerals 84 in the attached figures are arranged in alignment.

[0041] The first and second control openings 41 and 42 are spaced apart from each other by two reversing regions 44 in the circumferential direction about the rotation axis 11. Currently, three pressure balancing openings 45 are arranged there, each formed by a circular borehole penetrating the control plate 40. The aforementioned borehole is related to the first borehole (…). Figure 5Reference numeral 81) in the attached diagram exits from the control panel 40. The corresponding fluid transition section is designed such that virtually no pressurized fluid can flow from the first connecting channel ( Figure 5 Reference numeral 51) directly reaches the first control opening 41. Small, unavoidable leaks are possible, in which these leaks do not substantially impede the function of the pre-compression chamber in reducing pressure pulsations.

[0042] The number and size of the pressure balance openings 45 are selected based on the desired throttling effect of the pressure balance openings 45.

[0043] It should also be noted that the pressure balancing groove 47 at the first control opening and the second control opening 41; 42 also helps to minimize pressure pulsation.

[0044] List of reference numerals in the attached diagram:

[0045] 10 Axial Piston Press

[0046] 11. Rotation axis

[0047] 12 Pivot axis

[0048] 13 drive shafts

[0049] 14 Drive shaft head

[0050] 15. Supply pump

[0051] 16. Control valve

[0052] 20 cylinders

[0053] 21 Pistons

[0054] 22 cylinder chambers

[0055] 23. Ski boots

[0056] 24 Pivot Cradle

[0057] 25 Corresponding control surfaces

[0058] 26. Convergence opening

[0059] 27 Adjusting cylinder

[0060] 30. Housing

[0061] 31 First working interface (high voltage, pre-compression structural assembly)

[0062] 32 Second working interface (low voltage)

[0063] 33 First shell component (can-shaped)

[0064] 34 Second housing component

[0065] 35 Rotary bearing

[0066] 36 Corresponding contact surfaces

[0067] 40 Control Panel

[0068] 41 First control opening

[0069] 42 Second control opening

[0070] 43 Control Surface

[0071] 44 Reversing Area

[0072] 45 Pressure balance opening

[0073] 46. ​​Opening at the bottom

[0074] 47 Pressure Balance Groove

[0075] 50 Pre-compressed structural components

[0076] 51 First Connection Channel

[0077] 52 Second Connection Channel

[0078] 53 Pre-compression chamber

[0079] 54 Fastening threaded parts

[0080] 60 matrix

[0081] 61 First Sub-chamber

[0082] 62 Second Sub-chamber

[0083] 63 Cylindrical section

[0084] 64 Internal Thread

[0085] 65 First perforation

[0086] 66 Second perforation

[0087] 67 Third perforation

[0088] 68. Abutment surface

[0089] 69 Flat surface

[0090] 71 First closed threaded component

[0091] 72 Second closed threaded component

[0092] 73 First sealing ring

[0093] 74 Second sealing ring

[0094] 75 First Thickness

[0095] 76 Second Thickness

[0096] 80 Support surface

[0097] 81 First Drill Hole

[0098] 82 Second Drill Hole

[0099] 83 Work Channel

[0100] 84 First Confluence Opening

[0101] 85 Second Confluence Opening

Claims

1. An axial piston machine (10) having a housing (30) in which a cylinder (20) is rotatably received about a rotation axis (11), wherein, Multiple pistons (21) are linearly movably received in the cylinder (20) such that these pistons, together with the cylinder (20), define a cylinder chamber (22), wherein the cylinder (20) has a corresponding control surface (25) pointing in the direction of the rotation axis (11), wherein each cylinder chamber (22) extends through the corresponding control surface (25) with a correspondingly associated manifold opening (26), wherein the corresponding control surface (25) is slidably abutted against a control surface (43), which is arranged antirotationally about the rotation axis (11), wherein the control surface (43) has a first control opening and a second control opening (41; 42), the first control opening and the second control opening having a kidney-shaped profile, wherein the first control opening (41) is fluidly connected to a first working interface (31), and the second control opening (42) is fluidly connected to a second working interface (32), wherein the first... The control opening and the second control opening (41; 42) are spaced apart from each other by a reversing region (44) in the circumferential direction about the axis of rotation. At least one pressure balancing opening (45) is provided, which is connected to an associated pre-compression chamber (53) via a first connecting channel (51). The at least one pressure balancing opening (45) is arranged at the control surface (43) in the associated reversing region (44) such that each manifold opening (26) covers the aforementioned pressure balancing opening (45) in at least one rotational position of the cylinder (20). The pre-compression chamber (53) is a component of a separate pre-compression structure assembly (50), which is fixedly connected to the housing (30) such that a first perforation (65) in the pre-compression structure assembly (50) aligns with and continues the associated first or second working interface (31; 32). The pre-compression chamber (53) is characterized in that it comprises a first sub-chamber and a separate second sub-chamber (61; 62), which are permanently fluidly connected to each other by a second connecting channel (52), wherein a first perforation (65) is arranged between the first sub-chamber and the second sub-chamber (61; 62), and wherein the second connecting channel (52) extends through the first perforation (65) at a distance.

2. The axial piston machine (10) according to claim 1, in, The first sub-chamber and the second sub-chamber (61; 62) are constructed identically to each other.

3. The axial piston machine (10) according to any one of the preceding claims, in, The pre-compression structure assembly (50) includes an integral base (60) that abuts against a flat corresponding abutment surface (36) of the housing (30) with a flat abutment surface (68), wherein a first perforation (65) is completely disposed in the base (60) and extends through the abutment surface (68), wherein a second connecting channel (52) is completely disposed in the base (60).

4. The axial piston machine (10) according to claim 3, in, The first sub-chamber and the second sub-chamber (61; 62) each include a cylindrical section (63), wherein the cylindrical section (63) is formed directly from the substrate (60), wherein the cylindrical section is closed at its end by at least one first closing thread (71), and wherein the two cylindrical sections (63) are arranged parallel to each other.

5. The axial piston machine (10) according to claim 4, in, The two cylindrical sections (63) are arranged parallel to the abutment surface (68).

6. The axial piston machine (10) according to any one of claims 3 to 5, in, The first thickness or the second thickness (75; 76) of the substrate (30) is measured perpendicular to the abutment surface (68), wherein the first thickness (75) in the region of the first perforation (65) is less than the second thickness (76) in the region of the first sub-chamber or the second sub-chamber (61; 62).

7. The axial piston machine (10) according to claim 6, in, The substrate (60) has a constant first thickness (75) in the region of the first perforation (65), wherein the substrate has a constant second thickness (76) in the regions of the first sub-chamber and the second sub-chamber (61; 62).

8. The axial piston machine (10) according to any one of claims 3 to 7, in, The second connecting channel (52) is cylindrically constructed, wherein the second connecting channel is closed at at least one end using a second closing thread (72).

9. The axial piston machine (10) according to claim 8, referencing claim 4. in, The second connecting channel (52) extends perpendicular to the two cylindrical sections (63) and parallel to the abutment surface (68).

10. The axial piston machine (10) according to any one of claims 3 to 9, in, The axial piston machine (10) includes a pivoting rocker (24) capable of pivoting about a pivot axis (12), by means of which the displacement volume of the axial piston machine (10) can be adjusted, wherein the pivot axis (12) is oriented perpendicular to the rotation axis (11), wherein the corresponding abutment surface (36) is arranged parallel to the rotation axis (11), wherein the corresponding abutment surface is arranged at an angle between 30° and 60°, preferably at 45°, relative to the pivot axis (12).

11. The axial piston machine (10) according to any one of claims 4 to 10, in, The first connecting channel (51) extends through the region in which the abutment surface (68) contacts the corresponding abutment surface (36), wherein the first connecting channel extends only into the first sub-chamber (61).

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