Swing angle measuring device on variable displacement hydrostatic axial piston machine

Abstract

The invention relates to a swing angle measuring device (44) and to a hydrostatic axial piston machine (1) comprising a swash plate (26), the swing angle of which can be adjusted by means of an adjusting piston (38) guided in an adjusting cylinder (34), and a swing angle measuring device (44), by means of which the swing angle of the swash plate (26) can be detected. The pivot angle measuring device (44) has a movable transmitter formed by a permanent magnet (46) and a receiver (48) fastened to the housing. The pivot angle measuring device (44) is translated, wherein the permanent magnet (46) can be driven by the actuating piston (38) linearly and translatably in the direction of movement (45) thereof by means of a magnet coupling mechanism.

Description

Technical Field

[0001] The invention relates to the detection of the pivot angle of a hydrostatic axial piston machine of swash plate design, the displacement of which is adjustable. Background Art

[0002] From the prior art, displacement-adjustable hydrostatic axial piston machines of swash plate design are known, wherein the working piston of the axial piston machine is coupled to a swash plate which is formed on a cradle. In order to be able to adjust the displacement of the axial piston machine, the cradle is pivotably mounted in the housing of the axial piston machine.

[0003] DE 102017213457 A1 describes an axial piston machine whose cradle is coupled to an adjusting piston of a hydrostatic adjusting device via a journal formed integrally with the cradle and via a slide rotatably supported on the journal. The adjusting device has an adjusting cylinder formed as a screwable insert sleeve, in which the adjusting piston is partially accommodated. The adjusting piston has a dual function. The regulating pressure medium is provided by an external regulating pressure medium source.

[0004] For such axial piston machines, it is important for control and regulation tasks to detect the pivot angle of the cradle. Rotary pivot angle measuring devices are known from the prior art.

[0005] DE 102014200566 A1 discloses a rotary swivel angle measuring device which is positioned on the (non-physical) swivel axis of the cradle. The swivel angle is thus directly and without change (without speed increase or speed decrease ( -oderUntersetzung). The swivel angle measuring device has a shaft, which is coupled to the cradle via a rotary coupling mechanism and a cradle journal. The coupling mechanism is a leaf spring made of spring steel. A disadvantage of such a swivel angle measuring device is the required installation space.

[0006] DE 102010045540 A1 discloses an axial piston machine, whose adjusting device has an adjusting piston, to which a rotary swivel angle measuring device is coupled. The swivel angle measuring device has a permanent magnet, which moves past a swivel angle receiver having a Hall sensor on a circular track using a return rod. The return rod engages with its (free) end section in a receptacle of the adjusting piston.

[0007] Furthermore, it is known from the in-house prior art that for the aforementioned axial piston machine with a control piston and with a rotary swivel angle measuring device, the (free) end section of the return rod engages in a surrounding groove of the control piston in which the rod of the cradle also engages. The swivel angle measuring device is inserted into a through-cut recess of the housing and thereby seals off the interior of the axial piston machine in which the tank pressure prevails.

[0008] The two last-mentioned rotary swivel angle measuring devices and their conversion process of the linear and / or translational control piston movement into the rotary transmitter movement have the disadvantage that the (free) end section of the return rod always has to be moved in and out radially relative to the recess of the control piston. In addition, at the end region of the control piston path, the transmission of the longer movement of the control piston (with increasing tendency) can only be converted into a small rotary movement of the transmitter, with an increased risk of pinching. It is also disadvantageous that the bearing structure of the return rod and the clamping structure of the transmitter magnet require an increased installation space requirement in the axial direction of the bearing structure. Summary of the invention

[0009] The object of the present invention is to avoid these disadvantages. This object is achieved by a pivot angle measuring device having the features of claim 1 and by an axial piston machine having the features of claim 11 .

[0010] The claimed hydrostatic axial piston machine has a swash plate formed on a cradle, the swivel angle of which can be adjusted by means of an adjusting piston guided in an adjusting cylinder. For this purpose, the adjusting piston is mechanically coupled to the swash plate. A swivel angle measuring device, also claimed, is provided, by means of which the swivel angle of the swash plate can be detected and which can also be referred to as a swivel angle sensor device or swivel angle sensing device. The swivel angle measuring device has a movable transmitter formed by a permanent magnet and a receiver (preferably a Hall sensor) fixed to a housing. According to the invention, the swivel angle measuring device is translational, so that the permanent magnet is guided past the receiver in a translational relative movement. For this purpose, the permanent magnet can be driven (mitnehmbar) by the adjusting piston linearly and translationally along its direction of movement by means of a magnet coupling mechanism.

[0011] This avoids the radial movement of the (free) end section of the return rod into and out of the recess / groove of the control piston, which is necessary in the prior art rotary swivel angle measuring devices. In particular, at the end region of the control piston path, the transmission of a relatively long movement of the control piston can be converted into an unreduced long translational or linear movement of the transmitter, with the risk of jamming being kept to a minimum.

[0012] The regulating piston housing can be penetrated by a through-hole extending in the direction of movement of the regulating piston and along or in which the permanent magnet is guided so as to be linearly movable.

[0013] The through-opening is preferably covered over its entire length by a cover, wherein a seal between the cover and the regulating piston housing continuously surrounds the through-opening.

[0014] The receiver (for example a Hall sensor) is received sealingly in the (cylindrical) aperture of the cover.

[0015] The adjusting piston can have a circumferential groove, via which the adjusting piston is coupled to the cradle (for example by means of a slide block). If the magnetic coupling is then at least partially immersed in this groove, this is also simple in terms of device technology and saves construction space. The adjusting piston can be rotated about its axis. The magnetic coupling is thus designed to be movable in the groove in the circumferential direction of the adjusting piston.

[0016] In a particularly preferred embodiment variant, the magnet coupling has a spring element, by means of which the permanent magnet is elastically clamped to mutually opposite side walls of the groove.

[0017] In a particularly preferred embodiment variant, the magnetic coupling has a spring element with two legs that are elastically movable relative to one another and that bear under prestress against mutually opposite side walls of the groove.

[0018] The spring element is preferably formed in one piece from spring steel (in particular using a stamping and bending method) or from a helical spring.

[0019] The magnet coupling preferably has a magnet housing, which preferably surrounds the permanent magnet on all sides. The magnet housing is preferably a one-piece or two-piece plastic injection-molded part. It is important that this magnet housing is optimized for sliding, so that it can slide along the perforation of the cover without jamming and with little resistance, for example in a linear guide.

[0020] In a first embodiment variant of the magnet coupling, the spring element has a planar main section, which is fastened to the side of the magnet housing facing the slot. The two legs extend from the main section.

[0021] The main section can have four webs or connecting plates, at the ends of which a through-hole is formed in each case, through which a plastically deformable lug of the magnet housing extends in each case.

[0022] In a second embodiment variant of the magnetic coupling, the magnetic coupling has the above-mentioned magnet housing. The spring element has a bent (e.g., strip-shaped or strip-shaped) main section, which surrounds the magnet housing on a plurality of, e.g., three sides not facing the groove. A leg extending from the magnet housing is formed on each of the two (free) end sections of the main section.

[0023] In a third embodiment variant of the magnetic coupling, the magnetic coupling has the above-mentioned magnet housing. Two webs or connecting plates are integrally formed on the side of the magnet housing facing the groove (preferably cast by plastic injection molding), which extend into the groove and abut against the side walls of the groove. The spring element is clamped between the two webs or connecting plates. As a result, the spring element has no direct contact with the side walls of the groove. It is particularly preferred that one of the webs or connecting plates has an increased flexibility relative to the other web or relative to the other connecting plate.

[0024] In a first improvement of the third embodiment variant, the spring element has a main section fixed to the magnet housing and two legs extending from the main section. A through-hole can be formed on the main section of the spring element, through which the plastically deformed lug of the magnet housing extends.

[0025] In a second development of the third embodiment variant, the spring element is a helical spring. The helical spring is preferably held on a circular projection of the two webs or connecting plates at each end section.

[0026] The central main section of the spring element can be developed into a groove-shaped or pot-shaped or groove-shaped receptacle for a permanent magnet. The magnet housing then surrounds the permanent magnet together with the receptacle.

[0027] In a fourth embodiment variant of the magnet coupling, the groove-shaped receptacle is provided and the two legs extend through the side of the magnet housing facing the groove.

[0028] In a seventh embodiment variant of the magnet coupling, the groove-shaped or pot-shaped or groove-shaped receptacle is provided and the magnet housing is formed by a profile which (except for an optional clamping section on the side facing away from the groove) has a substantially constant cross section over its length. The profile can be displaced or displaced in the direction of movement of the control piston by the permanent magnet and the receptacle. The seventh embodiment variant is provided as a stamped and bent part made of metal.

[0029] In a fifth embodiment variant of the magnet coupling mechanism, the magnet coupling mechanism has two magnet housing halves, wherein the spring element has a main section from which the two legs and four retaining legs extend. The two magnet housing halves are clamped between the four retaining legs, wherein two retaining legs each rest against one magnet housing half. A through-hole can be formed on each retaining leg, and a through-hole can be formed on each magnet housing half, and two clamping flanges can be formed on each magnet housing half, which extend into the through-holes respectively. In order to compensate for tolerances of the magnet housing halves and when they are enlarged by the clamping flanges during installation, the retaining legs can be appropriately made in a Z-shaped or S-shaped manner so that they allow a larger deformation stroke.

[0030] In a sixth embodiment variant, a tab or a connecting plate is integrally formed on the magnet housing, the tab or the connecting plate resting on one of the side walls of the groove. Another tab or another connecting plate is preferably supported on the magnet housing in a movably manner along the movement direction of the regulating piston. The two tabs or connecting plates extend into the groove. The spring element is clamped between the two tabs or connecting plates and presses it toward the side wall of the groove. As a result, the spring element has no direct contact with the side wall of the groove.

[0031] In a sixth embodiment variant, the spring element is preferably a helical spring.

[0032] In order to prevent overloading of the spring element resulting from the large amplitude of the magnet coupling, a stop can be arranged on the magnet housing. As a result, the spring element is only loaded up to a predefined stroke.

[0033] For this purpose, two stops in the form of domes can be integrally formed on the side of the magnet housing facing the groove, which stops extend into the groove and can come into contact with the side edges of the groove.

[0034] The spring element can have a main section from which the two legs extend. In a space-saving development, the two legs have respective through-cuts through which the dome can extend when the legs are sprung inwards. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] An exemplary embodiment of the disclosure together with different implementation variants of the magnetic coupling will be described below based on the associated drawings.

[0036] Figure 1 An exemplary embodiment of a swivel angle measuring device according to the invention or an axial piston machine according to the invention is shown;

[0037] Figure 2 Shows Figure 1 An adjusting device for an axial piston machine in the invention, comprising a translational swivel angle measuring device;

[0038] Figure 3 A first embodiment variant of a permanent magnet with a magnet coupling mechanism is shown, which is used in Figure 1 In the swing angle measuring device;

[0039] Figure 4 A second embodiment of a magnetic coupling mechanism is shown, which is used in Figure 2 In the swing angle measuring device;

[0040] Figure 5 and 6 A third embodiment variant of a permanent magnet with a magnet coupling mechanism is shown, which is used in Figure 2 In the swing angle measuring device;

[0041] Figure 7 A fourth embodiment variant of a magnetic coupling mechanism is shown, which is used in Figure 2 In the swing angle measuring device;

[0042] Figure 8 Shows Figure 7 A spring element of a fourth embodiment of the magnet coupling mechanism;

[0043] Fig. 9 A fifth embodiment of a magnetic coupling mechanism is shown, which is used in Figure 2 In the swing angle measuring device;

[0044] Fig.10 Shows Fig. 9 a magnet housing half of a magnet coupling mechanism;

[0045] Fig.11 A sixth embodiment variant of a magnetic coupling mechanism is shown, wherein the magnetic coupling mechanism is used in Figure 2 In the swing angle measuring device;

[0046] Fig.12 A seventh embodiment variant of a permanent magnet with a magnet coupling mechanism is shown, which is used in Figure 2 in a swivel angle measuring device; and

[0047] Fig.13a and 13b An eighth embodiment variant of a permanent magnet with a magnet coupling mechanism is shown, which is used in Figure 2 In the swing angle measuring device.

[0048] List of reference numerals:

[0049] 1 Axial piston machine

[0050] 2 Housing

[0051] 4 Pot-shaped housing

[0052] 4a Adjusting piston housing

[0053] 4b Perforation (elongated)

[0054] 6 Housing cover

[0055] 8 Drive shaft

[0056] 10 Bottom

[0057] 12 Shaft end

[0058] 14 External teeth

[0059] 16 Cylinder

[0060] 18 Rotation axis

[0061] 19 Cylinder bore

[0062] 20 Working piston

[0063] 22 Studio

[0064] 24 Control Panel

[0065] 26 Swash Plate

[0066] 27 Through the pit

[0067] 28 Cradle

[0068] 30 Journal

[0069] 31 Sliders

[0070] 32 Adjustment mechanism

[0071] 34 Adjustment cylinder

[0072] 38 Adjusting piston

[0073] 42 Rotation axis

[0074] 43 Cover

[0075] 43b Perforation

[0076] 44 Swing angle measuring device

[0077] 45 Movement direction

[0078] 46 permanent magnet

[0079] 47 Linear guide

[0080] 48 receiver / Hall sensor

[0081] 52 Magnet housing

[0082] 52a Splice

[0083] 52b splice

[0084] 54 Spring element

[0085] 56 Main section

[0086] 58 Legs

[0087] 60 (spring element) tab

[0088] 154 Spring element

[0089] 254 Coil spring

[0090] 354 Spring element

[0091] 356 Reception Department

[0092] 452 magnet housing half

[0093] 454 Spring element

[0094] 460 Keep Outrigger

[0095] 552b splice

[0096] 654 Spring element

[0097] 561 Guide section

[0098] 652 Magnet housing / profile

[0099] 656 Reception Department

[0100] 662 Clamping section

[0101] 752 Magnet Housing

[0102] 752a Vault

[0103] 752a Vault

[0104] 754 Spring element

[0105] a Itinerary. DETAILED DESCRIPTION

[0106] Figure 1 An axial piston machine 1 with an adjustable displacement and a swash plate design is shown. The axial piston machine can be operated as a pump and as a motor. It has a housing 2, which has a substantially pot-shaped housing part 4 and a housing cover 6 with a working connection (not shown). A drive shaft 8 is rotatably supported in the housing 2. For transmitting torque, the drive shaft 8 has a shaft end 12, through which the bottom 10 of the pot-shaped housing part 4 is penetrated.

[0107] The drive shaft 8 has an external toothing 14 in the middle region, by means of which the drive shaft is connected in a rotationally fixed manner to a cylinder barrel 16. The cylinder barrel has a plurality of cylinder bores 19 arranged on a pitch circle extending concentrically to the axis of rotation 18 of the drive shaft 8 and the cylinder barrel 16, in each of which a working piston 20 is accommodated axially displaceably. The pairing of the working piston 20 and the cylinder bore 19 defines a hydrostatic working chamber 22, which, when the cylinder barrel 16 rotates, is alternately connected to the working connection via a control disk 24 penetrated by a through-hole.

[0108] On the end side of the cylinder 16 facing away from the control disk 24, the working piston 20 emerges from the cylinder 16 and is supported in a sliding manner by its piston head received in a slide on a swash plate 26, the pivot angle of which relative to the axis of rotation 18 can be adjusted. The swash plate is designed as a sliding surface of a cradle 28 which is pivotably mounted in the housing part 4. The cradle 28 has a through-hole 27, for example in the form of an elongated hole, pointing away from the swash plate 26 and with an enlarged diameter, through which the drive shaft 8 passes.

[0109] In order to be able to adjust the stroke of each working piston 20 and thus the displacement of the axial piston machine 1 (per rotation of the cylinder 16), the cradle 28 is coupled to a hydrostatic adjusting mechanism 32 via a journal 30 formed integrally therewith and a slide 31 supported on the journal 30 so as to be rotatable about an axis of rotation 42. The slide 31 is guided displaceably in a groove 33 of an adjusting piston 38 of the adjusting mechanism 32.

[0110] In order to indirectly detect the swivel angle of the swash plate 26 or the cradle 28, a swivel angle measuring device 44 is provided. The swivel angle measuring device has a substantially square cover 43, which is Figure 1 4 is shown in a transverse section. A linear guide 47 is integrally formed on the cover 43 and is inserted into the through hole 4b of the adjustment cylinder housing 4a of the pot-shaped housing part 4. A permanent magnet 46 serving as a transmitter of the swivel angle measuring device 44 is guided along the linear guide 47. The swivel angle measuring device 44 is explained in detail with reference to the following figure.

[0111] Figure 2 The hydrostatic adjustment mechanism 32 for the swivel angle is shown. The adjustment mechanism has an adjustment cylinder 34 which is designed as a screwable insert sleeve and an adjustment piston 38 which is partially accommodated therein. The adjustment piston 38 plays a dual role, since it can be effectively loaded with adjustment pressure medium in two directions. As a result, the adjustment piston moves along its center axis which defines the movement direction 45. When the adjustment piston 38 moves, the slide 31 which is eccentrically inserted (at the outer periphery) into the groove 33 is driven along the movement direction 45. As a result, the journal 30 inserted into the slide 31 is driven, which performs a rotational movement relative to the slide 31. Since the journal 30 is formed integrally on the cradle 28, the swivel angle is adjusted by the movement of the adjustment piston 38.

[0112] The permanent magnet 46 is coupled to the groove 33 of the control piston 38 via a so-called magnet coupling. The essential components of the magnet coupling (in all embodiments) are the magnet housing 52 and the spring element 54; 154; 354; 454; 554; 654. The magnet housing 52 surrounds the permanent magnet 46 on all sides and is optimized for sliding, so that it can move along the linear guide 47 without getting stuck and with low resistance. The spring element 54; 154; 354; 454; 554; 654 is inserted into the groove 33 under prestress. In this case, the spring element 54; 154; 454; 554; 654 can directly rest on the groove 33, but this is not mandatory. This ensures that the position of the control piston relative to the measuring element (driven device) is transmitted without clearance.

[0113] In accordance with Figure 3 In a first embodiment variant of the magnet coupling mechanism, the spring element 54 has a planar main section 56 which is fixed on the side of the magnet housing 52 facing the groove 33 (at Figure 3 Two resilient legs 58 extend from the main section 56 to (at Figure 233 (shown in FIG. 3 ). The main section 56 has four tabs 60, which are located in a plane together with the main section 56. A through-hole is formed at each end of the tabs 60 that is away from the main section 56, and two through-holes are formed in the main section 56. A lug (for example, plastically deformed) of the magnet housing 52 extends through the through-holes, and the lugs are used to fix the spring element 54 on the magnet housing 52.

[0114] according to Figure 4 A second embodiment of the magnetic coupling mechanism has the above-mentioned magnet housing 52. The spring element 154 of the magnetic coupling mechanism has a bent strip-shaped or strip-shaped main section 156, which is in three non-directional (in Figure 2 The magnet housing 52 is surrounded on the side of the groove 33 (shown in FIG. 1 ). On the two free end regions of the main section 156 of the spring element 154, an elastic leg 58 is formed, which is away from the magnet housing 52 (at Figure 4 The inner surface of the groove 33 extends downwardly in the groove 33.

[0115] according to Figure 5 and 6 The third embodiment variant of the magnet coupling mechanism also has the above-mentioned magnet housing 52, in which the permanent magnet 46 is enclosed. Two webs 52a, 52b are integrally molded on the side of the magnet housing 52 facing the groove 33 (shown in FIG. 32) by a plastic injection molding method, which extend into the groove 33 and abut against the side walls of the groove 33. One of the webs 52b has an increased flexibility compared to the other web 52a.

[0116] The spring element 54; 254 of the magnetic coupling is clamped between the two webs 52a, 52b. As a result, the spring element 54; 254 has no direct contact with the side walls of the groove 33, but nevertheless clamps the permanent magnet 46 in the groove and centers it relative to the groove 33.

[0117] Figure 5 A first improvement of the third embodiment variant is shown. The spring element 54 has a main section 56 fixed to the magnet housing 52 and two legs 58 extending from the main section. A through-hole is formed on the main section of the spring element 54, through which the lug of the magnet housing 52 extends.

[0118] Figure 6A second development of the third embodiment variant is shown, in which the spring element is a helical spring 254. The helical spring is held at each end section on a circular projection of the two webs 52a, 52b.

[0119] Figure 7 A fourth embodiment of the magnetic coupling mechanism is shown, and Figure 8 The spring element 354 is shown separately. The central main section of the spring element 354 is modified into a groove-shaped receiving portion 356 for the permanent magnet 46. The magnet housing 52 surrounds the permanent magnet 46 together with the receiving portion 356. To be precise, the receiving portion 356 is poured into the magnet housing 52 together with the permanent magnet 46 by a plastic injection molding method. The two legs 58 of the spring element 354 extend through the side of the magnet housing 52 facing the groove 33.

[0120] Fig. 9 A fifth embodiment variant of the magnet coupling is shown. The magnet coupling has two magnet housing halves 452, wherein the spring element 454 has a central main section 56, from which the two legs 58 and four Z-shaped or S-shaped retaining legs 460 extend. The two magnet housing halves 452 are clamped between the four retaining legs 460, wherein two retaining legs 460 in each case form a pair and rest against the magnet housing halves 452.

[0121] Each pair of retaining legs 460 is integrally arranged on one of the two edges, the edges being about (at Figure 2 The movement directions of the regulating piston 38 (shown in FIG. 1 ) are opposite to each other. A pair of retaining legs 460 are bent from the relevant edges of the main section 56 (at Figure 2 ) extends away from the groove 33 shown in FIG. Fig.11 Only one of the edges of the main section 56 and a pair of retaining legs 460 are shown.

[0122] A through recess is formed on each retaining leg 460 , and two clamping flanges are formed on each magnet housing half 452 , the clamping flanges respectively extending into the through recesses.

[0123] Fig.10 Shown separately Fig. 9 One of the two magnet housing halves 452 in the magnet housing. It can be seen that the magnet housing half 452 has two clamping holes facing the other magnet housing half 452 and two clamping journals facing the other magnet housing half 452. The symmetrical arrangement can achieve that the two magnet housing halves 452 have the same structure.

[0124] Fig.11 A sixth embodiment of the magnet coupling mechanism is shown, in which a single tab 52a is integrally formed on the magnet housing 52 and abuts against one of the side walls of the groove 33. Another tab 552b can be formed on the magnet housing 52 along (at Figure 2 To this end, the other link 552b is formed integrally on the guide section 561, which is arranged along (in Figure 2 The regulating piston 38 (shown in FIG. 1 ) is supported on the magnet housing 52 in a manner that it can move in the direction of movement. The guide section 561 has a long hole, through which the guide journal and the other connecting piece 52a extend. The guide journal and the other connecting piece 52a are integrally cast on the magnet housing 52.

[0125] The two webs 52a, 552b extend into the groove 33. The spring element is designed as a helical spring 354 and is clamped between the two webs 52a, 552b. As a result, the two webs 52a, 552b are clamped against the side walls of the groove 33. As a result, the helical spring 254 has no direct contact with the side walls of the groove 33.

[0126] In accordance with Fig.12 In a seventh embodiment variant of the magnetic coupling mechanism, the central main section of the spring element 654 is improved into a groove-shaped receiving portion 656 for the permanent magnet 46.

[0127] The magnet housing 652 is formed by a profile which, with the exception of a clamping section 662 on the side facing away from the groove 33, has a substantially C-shaped cross section which remains essentially the same over its length. When the magnet coupling is installed, the profile 652 is pushed onto the permanent magnet 46 and the receptacle 656 in the (later) movement direction 45 of the regulating piston 38 and surrounds the permanent magnet 46 and the receptacle 656 on multiple sides. Fig.12 On one side (in the middle and lower part), the profile 652 has an opening, through which the two legs 58 move during installation, and through which the two legs 58 extend when the magnet coupling mechanism is installed.

[0128] Fig.13a and 13b The permanent magnet 46 ( Fig.13b ) together with Figure 2An eighth embodiment variant of the magnetic coupling mechanism used in the swivel angle measuring device in FIG. 1 is provided. In order to prevent overloads on the spring element 754, in particular on its legs 58, caused by the large amplitude of the magnetic coupling mechanism, stops in the form of domes 752a, 752b are integrally formed on the magnet housing 752. As a result, the spring element 754 is only subjected to a stroke a ( Fig.13b ) load.

[0129] The spring element 754 has corresponding through-holes on the legs 58, through which the domes 752a, 752b of the magnet housing 752 protrude. As a result, the travel a of the magnet coupling in the groove 33 of the control piston 38 is limited.

Claims

1. A swivel angle measuring device (44) for a hydrostatic axial piston machine (1) having a swivel plate (26), the swivel angle of which can be adjusted by means of an adjusting piston (38) guided in an adjusting cylinder (34), wherein the swivel angle of the swivel plate (26) can be detected by means of the swivel angle measuring device (44), wherein the swivel angle measuring device (44) has a movable transmitter formed by a permanent magnet (46) and a receiver (48) fixed to a housing, characterized in that: The pivot angle measuring device (44) is translatory, wherein the permanent magnet (46) can be driven by the regulating piston (38) linearly and translatorily in its direction of movement (45) by means of a magnet coupling.

2. A swivel angle measuring device (44) according to claim 1, wherein the regulating piston housing (4a) is penetrated by a through hole (4b) extending along the movement direction (45) of the regulating piston (38), and the permanent magnet (46) is guided linearly and translationally along the through hole or in the through hole.

3. The swivel angle measuring device (44) according to claim 2, wherein the through hole (4b) is covered by a cover (43), wherein a seal located between the cover (43) and the regulating piston housing (4a) continuously surrounds the through hole (4b).

4. The swivel angle measuring device (44) according to claim 3, wherein the receiver (48) is received in a through hole (43b) of the cover (43).

5. A swivel angle measuring device (44) according to any one of the preceding claims, wherein the regulating piston (38) has a circumferential groove (33) via which the regulating piston is coupled to the swash plate (28), wherein the magnet coupling mechanism is at least partially and movably immersed in the groove (33).

6. A swivel angle measuring device (44) according to claim 5, wherein the magnet coupling mechanism has a spring element (54; 154; 254; 354; 454; 654; 754), by means of which the permanent magnet (46) is elastically clamped together with two opposing side walls of the groove (33), or wherein the magnet coupling mechanism has a spring element (54; 154; 354; 454; 654; 754), the spring element having two legs (58) that can be elastically moved relative to each other, the legs resting on the opposing side walls of the groove (33) under prestress.

7. A swivel angle measuring device (44) according to claim 6, wherein the magnet coupling mechanism has a magnet housing (52), which surrounds the permanent magnet (46), wherein two webs (52a, 52b) are integrally formed on the side of the magnet housing (52) facing the groove (33), the webs extend into the groove (33) and the webs abut against the side walls of the groove (33), wherein the spring element (54; 254) is clamped between the two webs (52a, 52b).

8. A swivel angle measuring device (44) according to claim 6, wherein the spring element (354; 654) has a pot-shaped or groove-shaped receiving portion (356, 656) for the permanent magnet (46), wherein the magnet coupling mechanism has a magnet housing (52; 652), which surrounds the permanent magnet (46) and the pot-shaped or groove-shaped receiving portion (356, 656).

9. A swivel angle measuring device (44) according to claim 6, wherein the magnet coupling mechanism has a magnet housing (52) surrounding the permanent magnet (46), wherein a web (52a) is formed integrally on the magnet housing (52), the web abutting against one of the side walls of the groove (33), and wherein another web (552b) is provided, the other web being supported on the magnet housing (52), wherein the web (52a, 552b) extends into the groove (33), and wherein the spring element (254) is clamped between the two webs (52a, 552b).

10. A swivel angle measuring device (44) according to claim 6, wherein the magnet coupling mechanism has a magnet housing (752) surrounding the permanent magnet (46), wherein two stops in the form of domes (752a, 752b) are integrally formed on the side of the magnet housing (752) facing the groove (33), the stops extending in the direction of the groove (33) and being able to abut against the side edge of the groove (33), wherein the spring element (754) has a main section (56) and the two legs (58) extend from the main section.

11. A hydrostatic axial piston machine (1) comprising a swash plate (26) and a pivot angle measuring device (44), wherein the pivot angle of the swash plate can be adjusted by means of an adjusting piston (38) guided in an adjusting cylinder (34); and the pivot angle of the swash plate (26) can be detected by means of the pivot angle measuring device, wherein the pivot angle measuring device (44) comprises a movable transmitter formed by a permanent magnet (46) and a receiver (48) fixed to a housing, characterized in that: The pivot angle measuring device (44) is translatory, wherein the permanent magnet (46) can be driven by the regulating piston (38) linearly and translationally in its direction of movement (45) by means of a magnet coupling.

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