Control device for an automated gearshift transmission

Abstract

The invention relates to a control device (10) for an automated gearshift transmission (12) of a motor vehicle, by means of which a selection or shift element of the gearshift transmission can be moved in order to set a shift gate or to engage or disengage a transmission gear, wherein the control device has a pressure medium-actuated actuator (54) which has a piston (58) and a piston rod (64) which can be connected to the selection or shift element of the gearshift transmission, wherein the piston is arranged radially tightly in a cylindrical receiving space (50) of a housing (18) of the control device and can be moved coaxially therein, wherein a sensor system (30) having a magnet (38) and a magnetic field-sensitive sensor (32) is present, and wherein the magnet is arranged on the piston at the end facing away from the piston rod by means of a holding device (44), while the sensor is arranged on the housing side diametrically opposite the magnet. Furthermore, it is provided that the holding device is connected to the piston in a manner rotatable about a longitudinal center axis (52) of the receiving space, that the holding device has a hollow-cylindrical or hollow-cylinder segment-like geometry, that a torsion-preventing element (80) in the form of a rod or plate is present, which is accommodated in an associated recess in the housing (18) in a form-locked manner at least at its two end portions, that the torsion-preventing element is held in a small-clearance secant manner with a clearance to the magnet in the holding device, and that, as a result, although axial and rotational movements of the piston are possible, a rotational movement of the holding device about the longitudinal center axis of the receiving space is prevented.

Description

TECHNICAL FIELD

[0001] The invention relates to a control device for an automated gearshift transmission of a motor vehicle, selection or shift elements of which can be moved by means of the control device in order to set a shift gate or to engage or disengage a transmission gear, wherein the control device has a pressure medium- driven actuator, which has a piston and a piston rod which can be connected to the selection or shift elements of the gearshift transmission, wherein the piston is arranged radially tightly in a cylindrical receiving space of a housing of the control device and can be moved coaxially therein, wherein a sensor system with a magnet and a magnetic field-sensitive sensor is present, and wherein the magnet is arranged on the piston at the end facing away from the piston rod by means of a holding device, while the sensor is arranged on the housing side diametrically opposite the magnet. BACKGROUND

[0002] From DE 10 2005 034 865 A1 a regulating device for a motor vehicle gearshift transmission is known. The regulating device has at least one movable regulating element, the position of which is detected by at least one sensor, wherein a code track is present, which has sections of different height, which are configured so as to be able to be scanned by the sensor. It is provided here that the sections of different height of the code track are arranged at least two-dimensionally. The sections of different height of the code track are preferably scanned without contact by the sensor. This complete mechanical decoupling is advantageous under certain environmental conditions, for example in the case of large temperature fluctuations or strong vibrations. According to the prior art, the at least one sensor can be a Hall sensor, which works without contact with a magnet.

[0003] Furthermore, from DE 10 2016 012 862 A1 a shift module for an automated gearshift transmission is known, which has a box-like module support in which an electronic control unit is arranged. A plurality of shift rods are arranged axially movably parallel to a bottom wall of the module support, which faces an interior space of the gearshift transmission. Shift forks are each fixed to the shift rods. The shift rods are in each case in operative connection with a movable part of a shift cylinder. Furthermore, a magnetic field-sensitive position sensor is present, which has a position encoder on the shift rod side and a position receiver fixed on the housing in order to detect the shift position of the associated shift sleeve. In order to improve the accuracy in detecting the shift position of the associated shift sleeve and to reduce the complexity required for protecting the position receiver and the associated sensor lines from contact with the transmission oil and mechanical damage, the position encoder is fixed on the shift fork head with a small distance to the bottom wall of the module support. Furthermore, the position sensor is arranged protected within the module support in a movement region of the position receiver moving on the inside of the bottom wall of the module support. SUMMARY

[0004] The invention is based on the task of specifying a control device of the aforementioned type, which has an actuator in the form of a piston-cylinder system, which has a magnet on its movable adjusting element, which is used as part of a sensor system for position determination of the adjusting element or for position determination of a transmission element that is actuated by the adjusting element. Here, it should be ensured that the adjusting element, although it can be moved coaxially to the longitudinal center axis of the actuator and can be rotated about the longitudinal center axis, the magnet should be prevented from rotating about the longitudinal center axis.

[0005] The invention relates to a control device of an automated gearshift transmission of a motor vehicle, by means of which a selection or shift element of the gearshift transmission can be moved in order to set a shift gate or to engage or disengage a transmission gear, wherein the control device has a pressure medium- driven actuator, which has a piston and a piston rod, which can be connected to the selection or shift element of the gearshift transmission, wherein the piston is arranged radially tightly in a cylindrical receiving space of a housing of the control device and can be moved coaxially therein, wherein a sensor system with a magnet and a magnetic field-sensitive sensor is present, and wherein the magnet is arranged on the piston on the end side facing away from the piston rod by means of a holding device, while the sensor is arranged on the housing side radially opposite the magnet.

[0006] In order to solve the task, it is provided that the holding device is connected to the piston in a manner that can be rotated about the longitudinal center axis of the receiving space, that the holding device has a hollow-cylindrical or hollow-cylinder segment geometry, that a rod- or plate-shaped anti-twist element is present, which is accommodated in a form-locked manner at least at its two end portions in an associated recess in the housing, that the anti-twist element is inserted with a small clearance into the hollow-cylindrical or hollow-cylinder segment holding device at a distance from the magnet, whereby, although axial and rotational movements of the piston are possible, a rotational movement of the holding device about the longitudinal center axis of the receiving space is prevented.

[0007] By means of the anti-twist element, a self-rotation of the holding device with the magnet arranged thereon about the longitudinal center axis of the cylindrical receiving space is reliably prevented, as a result of which the magnet is always positionally precisely aligned with the radially oppositely arranged sensor element. Furthermore, based on the preferably slightly clearance- accommodating cooperation of the holding device and the anti-twist element, axial movability of the holding device together with the piston carrying the holding device is ensured.

[0008] The anti-twist element preferably has a relatively small construction size and can be manufactured inexpensively without complex machining steps and installed in the housing of the control device. The preferably clearance- accommodating arrangement of the anti-twist element compensates for manufacturing tolerances and avoids mechanical stresses that occur as a result of temperature conditions during operation. Furthermore, the anti-twist element can also be easily integrated in existing structures in the case of the use of existing components. Furthermore, a minimization of wear can be achieved by means of the anti-twist element.

[0009] According to a technically advantageous embodiment of the actuating device, the holding device has two axially oriented longitudinal ribs, which each have a flat abutment surface pointing in the direction of the anti-twist element and which are arranged spaced apart from one another along an imaginary cutting line of the holding device. The flat and narrow abutment surfaces of the longitudinal ribs promote only slight frictional forces acting between the holding device and the anti-twist element, thereby ensuring smooth axial movability of the holding device and the piston of the actuating device.

[0010] It is furthermore preferred that the housing of the actuating device comprises a lower part and an upper part, which are sealed relative to one another by means of a sealing element. The two-part design of the housing can enable simple mounting of the components of the actuating device.

[0011] According to a further development of the actuating device, the wall of the lower part of the housing, which surrounds the accommodation space, has at least one holding pin arranged offset radially outwards and oriented axially towards the upper part of the housing, the anti-twist element has at least one pocket on the side thereof facing the lower part of the housing, and each holding pin is accommodated in a respectively assigned pocket and rests against the bottom of the pocket on the end side. A reliable positional fixing of the anti-twist element is thereby achieved, in particular when it is assembled. The at least one holding pin preferably has a cylindrical geometry, and the at least one pocket preferably has a pot-shaped geometry. There is, for example, a slight mechanical play between the pocket and the holding pin.

[0012] The anti-twist element has a trapezoidal geometry. It can thereby be manufactured simply and inexpensively. Furthermore, a reliable seating of the anti-twist element in the lower part of the housing of the actuating device is achieved by this geometry.

[0013] It is furthermore preferred that the bottom side of the anti-twist element pointing towards the holding device has an axially oriented radial deepening, and that radially inwards oriented contact surfaces are respectively formed on the anti-twist element in the vicinity of the two sides of the deepening. The abutment surfaces of the two longitudinal ribs of the holding device can rest on these two contact surfaces. A minimization of the mechanical contact surfaces between the anti-twist element and the holding device is thereby achieved, as will be further explained in connection with the embodiments.

[0014] The anti-twist element is preferably arranged form-lockingly within a niche-like and approximately trapezoidal recess in the wall of the hollow-cylindrical accommodation space of the housing. A reliable fixing of the anti-twist element in the side wall of the housing is thereby achieved.

[0015] It is furthermore preferred that the two contact surfaces of the anti-twist element are positioned at least slightly spaced apart and respectively parallel with respect to the respective abutment surfaces of the two longitudinal ribs of the holding device. The contact surfaces of the anti-twist element here extend approximately parallel to the abutment surfaces of the holding device. A particularly low-friction axial movability and rotation prevention of the holding device of the magnet is thereby achieved.

[0016] The holding device and the anti-rotation element are preferably made of the same material, whereby possible wear is avoided as far as possible.

[0017] According to a further development of the application, the sealing element is elastically embodied and has at least two domes which are integrally configured thereon and which are oriented with their longitudinal extension parallel to the longitudinal center axis. The configuration of the approximately knob-like domes still ensures reliable sealing between the shift transmission housing and the upper part. The sealing element is preferably designed as a face seal and is made of an elastic plastic.

[0018] It can furthermore be advantageous to provide that the axial length of the two domes of the sealing element is such that, in the assembled state of the upper part and the lower part of the housing of the actuating device, the anti-rotation element is mechanically preloaded by means of the at least two domes against at least one holding pin of the lower part of the housing. Thereby, the anti-rotation element is reliably prevented from following along, in particular in the axial direction of movement.

[0019] A further technically advantageous embodiment of the actuating device can be such that the at least two domes are connected and positioned to the sealing element by means of a plurality of tabs which are integrally configured on the sealing element. Thereby, a reduction in the number of components of the actuating device is achieved, as well as a simplified manufacture and assembly of the sealing element.

[0020] In order to achieve an easily rotatable connection between the piston and the holding device, it is preferably provided that the holding device has a circular through-opening radially inward, which is delimited by an annular shoulder wall of the holding device. Furthermore, the piston has an annular collar radially inward and distal to the piston rod, which extends toward the underside of the bolt passing through the through-opening without reaching the underside of the bolt. The annular shoulder of the holding device is arranged in the circular free space thus formed between the underside of the bolt and the collar of the piston by means of only a small clamping force.

[0021] It is furthermore provided that the axial position of the piston within the hollow-cylindrical accommodation space can be measured touchlessly by means of a sensor system. The axial position is, for example, one of the two end positions and an intermediate position in the actuating path of the piston.

[0022] According to a further development of the actuating device, a magnetic field-sensitive sensor is arranged radially outside the wall surrounding the hollow-cylindrical accommodation space. Thereby, a closed hole in the wall for accommodating the magnetic field-sensitive sensor is not necessary. BRIEF DESCRIPTION OF DRAWINGS

[0023] For a better understanding of the application, the description is accompanied by drawings. In the drawings:

[0024] Figure 1 a perspective partial view of an actuating device of an automated shift transmission according to the application is shown, with a holding device for holding a magnet as part of a sensor system and with an anti-rotation element,

[0025] Figure 2 a lower part of a housing of a control device with a sealing element, a holding device arranged in a receiving space of the housing and a Figure 1 anti-twist element according to

[0026] Figure 3 a longitudinal section along the cutting plane A-A according to Figure 2

[0027] Figure 4 a strongly diagrammatic perspective view of a holding device and an anti-twist element according to Figures 1 to 3

[0028] Figure 5 a cross-sectional view along the cutting plane V-V according to Figure 4

[0029] Figure 6 a strongly diagrammatic illustration of forces acting on a holding device and an anti-twist element according to Figure 5 Specific embodiments

[0030] Figure 1 a perspective cutaway view of a control device 10 of an automated gearshift transmission 12 of a motor vehicle, with a holding device 44 for a magnet 38, which is a component of a sensor system 30. The control device 10 has a housing 18, which has a lower part 22, a cover-like upper part 20 and a sealing element 28 arranged therebetween, which serves for fluid-tight sealing of the housing 18 formed by the lower part 22 and the upper part 20.

[0031] The control device 10 has at least one pressure medium-actuable actuator 54, which is configured as a piston-cylinder system, by means of which an actuator can be actuated for shifting or selecting elements of the gearshift transmission 12 in order to select a shift groove or to engage or disengage a transmission gear. The actuator 54 has a hollow-cylindrical receiving space 50 in the lower part 22 of the housing 18, in which a piston 58 is arranged coaxially to a longitudinal center axis 52 of the receiving space 50 in a movable manner. The piston 58 is closed in a pressure-tight manner with respect to a wall 106 surrounding the receiving space 50 radially to the outside by means of a surrounding piston sealing element 60. The piston 58 is preferably produced as a sheet-metal profile, which is injection molded radially to the outside with an elastic plastic material in order to integrally form the piston sealing 60.

[0032] ​​​​The piston rod 64 is fixed on the lower side 62 of the piston remote from the upper part 20 of the housing 18, at the free end 66 of the piston rod an interface 68 for the gearshift transmission 12 is formed. By means of the sectional cylindrical piston rod 64 a selection lever, not shown, can be connected and can be actuated in order to select a shift gate. However, the piston rod 64 can also be connected with a shift shaft or a shift fork of the gearshift transmission 12, wherein the latter serves for moving a shift sleeve assigned to a transmission gearwheel, not shown, along a transmission shaft. By actuating the shift sleeve a gearshift of an automated gearshift transmission can be initiated, as is known to the person skilled in the art from DE 10 2016 012 862 Al.

[0033] In order to ascertain the current actuation position of the piston 58 there is the already described sensor system 30, which has, inter alia, a magnetic field-sensitive sensor 32 and a magnet 38 in contactless acting connection therewith. Here, the magnetic field-sensitive sensor 32 is, for example, a Hall sensor 40, which is connected by means of a connection line, not shown, with an electronic evaluation device or control unit, also not shown. The magnet 38 is integrated in terms of construction into the already described holding device 44, which in this embodiment has a peripheral geometry of a hollow cylindrical segment. However, the holding device can also have a complete hollow cylindrical geometry. The holding device 44 is preferably manufactured from a plastic material. The magnet 38 is preferably an arc-shaped permanent magnet 46, which is embedded in one piece into the plastic material of the holding device 44.

[0034] By means of the sensor system 30 the axial position X of the piston 58 along the longitudinal centre axis 52 of the accommodation space 50 and thus the current shift gate selection state or shift state of the gearshift transmission 12 can be ascertained precisely. Here, the magnetic field-sensitive sensor 32 is positioned, for example, diametrically opposite the magnet 38, wherein the magnetic field-sensitive sensor 32 is arranged radially outside the surrounding wall 106 of the hollow cylindrical accommodation space 50.

[0035] In order to ensure a prescribed measurement, a permanent precise alignment of the magnetic field-sensitive sensor 32 with respect to the magnet 38 integrated in the holding device 44 is to be taken into account. In particular at the time of engaging a transmission gear, the piston rod 64 together with the piston 58 and the holding device 44 fixed thereon tends to a rotational movement about the longitudinal centre axis 52, which is shown by means of the circular first double arrow 76 in Figure 1 In order to avoid this undesired effect, according to the application there is a comparatively small anti-twist element 80, which cooperates with the holding device 44 in such a way that the coaxial movement of the combined component of the piston rod 64, the piston 58 and the holding device 44 is possible, whereas the rotational movement of the holding device 44 carrying the magnet 38 is almost frictionlessly prevented.

[0036] Figure 2In an axial top view, a lower part 22 of the housing 18 of the actuating device 10 is shown, which has a sealing element 28 arranged between an upper part 20 and the lower part 22 of the housing 18, a receiving space 50 of the housing 18, a piston 58 arranged therein, a holding device 44 fixed in a rotationally movable manner on the piston remote from the piston rod, and an anti-twist element 80 cooperating with the holding device 44.

[0037] It can be clearly seen that the elastic sealing element 28 is located on the lower part 22 of the housing 18 of the actuating device 10. The holding device 44 is connected in a rotationally movable manner to the upper side of the piston 58 remote from the piston rod and is at least partially arranged in the receiving space 50, which is surrounded by the hollow-cylindrical wall 106 of the lower part 22. The holding device 44 has a first axial longitudinal rib 90 and a second axial longitudinal rib 92, which have a flat abutment face 94, 96, respectively, pointing in the direction of the anti-twist element 80. Here, the two abutment faces 94, 96 extend geometrically on the holding device 44 along an imaginary tangent 98. This tangent 98 geometrically delimits an incomplete cylindrical segment of the holding device 44.

[0038] The anti-twist element 80 has an exemplary trapezoidal geometry, wherein the bottom side 110 of the anti-twist element 80 pointing in the direction of the holding device 44 has an axial, i.e. perpendicular to the drawing plane oriented radial deepening 112, next to which a first contact face 114 pointing radially inwards and a second contact face 116 pointing radially inwards are formed. Here, the trapezoidal anti-twist element 80 is arranged in a wall recess-like and geometrically approximately trapezoidal clearance 120 in the wall 106 of the lower part 22 of the housing 18, which is complementary to the anti-twist element 80.

[0039] The anti-twist element 80 can be arranged at least partially form-fittingly or with slight clearance in the clearance 120. In the case of a slight clearance configuration, the production costs are kept as low as possible, since the machining of the component can be dispensed with.

[0040] The two contact faces 114, 116 of the anti-twist element 80 are preferably arranged at least slightly clearance with respect to the abutment faces 94, 96 of the two longitudinal ribs 90, 92. As a result, a clamping effect between the holding device 44 and the anti-twist element 80 moving coaxially to the longitudinal centre axis 52 is avoided.

[0041] The holding device 44 and the anti-twist element 80 are preferably manufactured from the same material, which is for example a plastic material. Thereby, material wear during operation of the actuating device is further avoided.

[0042] The sealing element 28 is of resilient construction and can be made, for example, of an elastic plastic material. Here, the sealing element 28 has, by way of example, two pin-like domes 126, 128 integrated thereon and oriented axially, i.e. oriented perpendicular to the plane of the drawing. The anti-rotation element 80 is axially clamped between the upper part 20 and the lower part 22 of the housing 18 of the actuation device 10 by means of the two domes 126, 128 in the fully assembled state. This is particularly important when the anti-rotation element 80 is accommodated, by way of example, in the trapezoidal recess 120. The at least two domes 126, 128 are integrally connected to the sealing element 28 with the aid of a plurality of tabs 130, 132, 134, 136 which are integrally constructed on the sealing element 28 and are thereby precisely aligned.

[0043] On the basis of the partial abutment of the anti-rotation element 80 against the chord 98 of the retaining device 44, any self-rotation of the retaining device 44 is prevented. Since the retaining device 44 is connected in a rotatable manner to the piston 58, the piston 58 can still be rotated about its longitudinal axis or about the longitudinal centre axis 52 during the axial movement required for the engagement of a gearwheel of the transmission. The here shown circumferential orientation of the retaining device 44 with respect to the sensor 32 remains unchanged in all operating conditions of the actuation device 10, as a result of which an exact determination of the axial position X of the piston 58 of the actuation device 10 can be carried out by means of the sensor system 30.

[0044] Figure 3 A longitudinal section along the tangent A-A according to Figure 2 is shown. It is thereby clearly visible that the accommodation space 50 of the lower part 22 of the housing 18 of the actuation device 10 which is surrounded by the wall 106 of the lower part 22 of the housing 18. The piston 58 is accommodated in this accommodation space 50 in a coaxially movable manner with respect to the longitudinal centre axis 52 and is guided hermetically by means of the piston seal 60 which is designed here by way of example as a double-lip seal. The hermetic sealing between the lower part 22 and the upper part 20 of the housing 18 is carried out as already described by means of the sealing element 28.

[0045] The retaining device 44 which has the magnet 38 integrated thereon is of approximately hollow-cylindrical or hollow-cylinder segment-like design and is arranged at least section-wise in the accommodation space 50 of the lower part 22 of the housing 18 and is connected in a rotatable manner about the longitudinal centre axis 52 to the side of the piston 58 which is remote from the piston rod. The piston 58 is fixedly connected to the piston rod 64 by means of a bolt 142. The piston rod 64 has an interface 68 which is clearly visible here on its free end 66 which is directed away from the lower side 62 of the piston for a not shown actuation element of the gearshift transmission 12. This actuation element is, for example, a shift lever for the engagement and disengagement of a gearwheel of the transmission.

[0046] The retaining device 44 has a radially inward circular through-hole 188, which is wall-bounded by an annular shoulder 190 of the retaining device 44. The shoulder 190 of the retaining device 44 is arranged in an annular chamber between the underside of the bolt 142 and the annular neck 192 of the piston 58 with only a relatively small clamping force. The neck 192 of the piston 58 is formed radially inward on the piston 58 and extends radially outward in a direction under the bolt 142, but does not reach the underside of the bolt. The neck 192 is, for example, composed of an elastomer injection-molded into the metal region of the piston 58.

[0047] The clamping force that holds the retaining device 44 on the piston 58 is set to be such that the retaining device 44 moves with the piston without clearance when the piston 58 moves axially, and to be such that the retaining device 44 is fixedly held by the anti-torsion element 80 without damage when the piston 58 rotates, that is, the friction is very small to prevent it from rotating with the piston.

[0048] The receiving space 50 of the housing 18 is also clearly visible here, radially limited by the surrounding, generally hollow cylindrical wall 106. The wall 106 has a cylindrical retaining pin 150 formed radially outwardly and axially pointing upward in the direction of the upper portion 20 in the region of the bottom surface 148 where the opening 120 is located axially outwardly or upwardly. The anti-torsion element 80 is received in the retaining pin 150 by means of a can-shaped pocket 152 formed on the underside of the anti-torsion element 80 and attached thereto, and in particular, is fixed in position thereby.

[0049] In the upper part 20 and lower part 22 of the housing 18 of the operating device 10 Figure 3 In the fully assembled state shown, the anti-torsion element 80 is secured by at least two domes 126, 128 (wherein, Figure 3 Only the arch 128 is visible. The axial direction is pre-tightened relative to the retaining pin 150. As a result, with the anti-torsion element 80 partially accommodated within the clearance 120 of the lower portion 22, the axial movement of the anti-torsion element with respect to the components consisting of the piston 58, piston rod 64, and retaining device 44 is reliably fixed within the accommodating space 50, coaxial with the longitudinal central axis 52. This prevents clamping and / or overturning effects, particularly between the anti-torsion element 80 and the retaining device 44 of the magnet 38.

[0050] In cases where there is at least a partial form-locking (not shown here) between the anti-torsion element 80 and the lower portion 22 of the housing 18 of the operating device 10, the axial clamping between the retaining pin 150 of the lower portion 22 and the upper portion 20 of the housing 18 by means of the domes 126, 128 of the sealing element 28 is not mandatory.

[0051] Figure 4 Showing according to Figures 1 to 3A perspective view strongly illustrating the retaining device 44 and the anti-torsion element 80. Here one can also see that... Figure 4 The retaining device 44 of the invisible magnet 38 is housed within the receiving space 50 of the lower portion 22 of the housing 18 of the operating device 10 and is coaxially movable relative to the longitudinal central axis 52. The two mating surfaces 94, 96 of the retaining device 44 (which are in close contact with the two contact surfaces 114, 116 of the anti-torsion element 80 for preventing rotation of the retaining device 44) are here simplified as parallel-extending flat surfaces 164, 166 for the purpose of clearer overview of the drawings. Here, the trapezoidal anti-torsion element 80 is exemplary only partially shaped-locked within the similarly trapezoidal recess 120 of the lower portion 22 of the housing 18 of the operating device 10. Furthermore, the recess 120 here exemplary has two aligned protrusions 160, 162 within the wall 106 of the lower portion 22 of the housing 18, which laterally overlap the flat surface 166 of the anti-torsion element 80 oriented towards the retaining device 44. As a result, the anti-torsion element 80 cannot move parallel to the upper side 168 of the lower part 22 of the housing 18; instead, it is accommodated in the recess 120 in a form-locking manner as much as possible.

[0052] Figure 5 According to Figure 4 The tangent VV shows a simplified cross-section. The retaining device 44, having a magnet 38, is axially housed within the receiving space 50 of the lower portion 22 of the housing 18, coaxial with respect to the longitudinal central axis 52, or in the direction of the second double arrow 174. The receiving space 50 is closed by means of the upper portion 20 of the housing 18. An anti-torsion element 80 is exemplarily housed within the recess 120 of the lower portion 22 of the housing 18, and thus moves at least slightly parallel to the upper side 168 of the lower portion 22 of the housing 18. To prevent this parallel movement, the anti-torsion element 80 is axially clamped between the bottom surface 148 of the recess 120 within the upper portion 20 and the lower portion 22 of the housing 18 by means of a pin-shaped dome 128, which serves as a component of the sealing element 28 and is visible only here. This ensures that the anti-torsion element 80 is reliably fixed in position within the recess 120 when the retaining device 44 moves axially within the receiving space 50.

[0053] Figure 6 The diagram is illustrated in a highly suggestive way. Figure 5The forces acting on the retaining device 44 and the anti-rotation element 80. The anti-rotation element 80, which is arranged here with a gap, is visible arranged between the upper part 20 and the lower part 22 of the housing 18 and is axially clamped by means of the only visible dome 128 of the sealing element 28. The retaining device 44, which has the magnet 38 arranged thereon or is completely injection molded with plastic, strives, together with the piston 58 and the piston rod 64, to react to the effect of the anti-rotation element 80 rotating about the longitudinal center axis 52 according to the rotational arrow 180. In addition, the retaining device 44 (as is shown using the third double arrow 182) performs an axial movement coaxially with respect to the longitudinal center axis 52. There is a first point of contact PI, which is described in simplified terms, between the retaining device 44 and the anti-rotation element 80, in the area of which there is a first sliding friction μι. In addition, there is a second point of contact P2, which is described in simplified terms, between the dome 128 and the anti-rotation element 80, in the area of which there is a second sliding friction μ2 between the dome 128 and the anti-rotation element 80. Finally, there is a bearing point P A about which the anti-rotation element 80 can be flipped. Based on the axial movement of the retaining device 44, the anti-rotation element 80 strives to move upwards or downwards towards the direction of the fourth double arrow 184, which results in a compression movement of the elastic dome 128 towards the direction of the fifth double arrow 186.

[0054] The retaining device 44, when in contact with the anti-rotation element 80, acts on the anti-rotation element 80 with a horizontal force FI, which is oriented perpendicular to the longitudinal center axis 52, whereby an equal and opposite reaction force F T acts in the first point of contact PI. The upper part 20 of the housing 18 presses the dome 128 of the sealing element 28 with a normal force N C acting parallel to the longitudinal center axis 52, which there results in an equal and opposite normal reaction force R C1 . The pressure R C2 is thus transmitted by the dome 128 of the sealing element 28, which acts vertically on the anti-rotation element 80 at the point P2 and is equal in size to the normal force N C .

[0055] Based on the upward and downward oriented axial movement of the retaining device 44, there is an unwanted tipping force F x obtained as F x = FI * μι, which is proportional to the size of the horizontal force FI and the sliding friction μι between the retaining device 44 and the anti-rotation element 80.

[0056] There is a first lever length a between the first point of contact PI and the second point of contact P2, and a second lever length b between the second point of contact P2 and the bearing force P Aextends between the two abutments 126, 128. In order to ensure a reliable position fixing of the anti-twist element 80 accommodated with play in the recess 120 of the lower part 22 of the housing 18 also in the presence of axial movements of the actuating device 44, the inequality F x *(a+b)<R C2 *b must be fulfilled. This means that the torque formed by the overturning force F x and the product of the sum a+b of the two lever lengths must always be smaller than the torque formed by the pressure R C2 or the normal force N C and the product of the second lever length b. The pressure R C2 formed by the dome 128, the upper part 20 and the lower part 22 of the housing 18 and acting on the anti-twist element 80 must thus always be greater than the overturning force F x .

[0057] The compliance with the inequality can be ensured approximately by a corresponding material selection to set the two sliding frictions μ1, μ2, by selecting an elastic plastic with an appropriate elasticity for the at least one dome 128 and by a corresponding axial mechanical clamping or pre-tensioning of the dome 128.

[0058] List of reference signs (component of the description)

[0059] 10 actuating device of an automated gearshift transmission

[0060] 12 automated gearshift transmission

[0061] 18 housing of the actuating device

[0062] 20 upper part of the housing

[0063] 22 lower part of the housing

[0064] 28 sealing element

[0065] 30 sensor system

[0066] 32 magnetic field-sensitive sensor

[0067] 38 magnet

[0068] 40 Hall sensor

[0069] 44 holding device of the magnet

[0070] 46 permanent magnet

[0071] 50 accommodation space in the lower part of the housing

[0072] 52 longitudinal center axis

[0073] 54 actuator

[0074] 58 piston

[0075] 60 piston seal

[0076] 62 underside of piston

[0077] 64 piston rod

[0078] 66 free end of piston rod

[0079] 68 interface

[0080] 76 first double arrow

[0081] 80 anti-twist element

[0082] 90 first axially longitudinal rib of holding device

[0083] 92 second axially longitudinal rib of holding device

[0084] 94 first contact surface of holding device

[0085] 96 second contact surface of holding device

[0086] 98 secant of holding device

[0087] 106 wall of accommodation space

[0088] 110 underside of anti-twist element

[0089] 112 deepening within anti-twist element

[0090] 114 first contact surface of anti-twist element

[0091] 116 second contact surface of anti-twist element

[0092] 120 recess within lower part of housing

[0093] 126 first arch

[0094] 128 second arch

[0095] 130 first tab

[0096] 132 second tab

[0097] 134 third tab

[0098] 136 fourth tab

[0099] 142 screw

[0100] 148 bottom surface of recess

[0101] 150 holding pin

[0102] 152 pocket in anti-twist element

[0103] 160 first protrusion

[0104] 162 second protrusion

[0105] 164 flat surface of retaining device

[0106] 166 flat surface of anti-twist element

[0107] 168 upper side of lower part of housing

[0108] 174 second double arrow

[0109] 180 rotating arrow

[0110] 182 third double arrow

[0111] 184 fourth double arrow

[0112] 186 fifth double arrow

[0113] 188 through opening of retaining device

[0114] 190 annular shoulder of retaining device

[0115] 192 annular neck of piston

[0116] a first rod length

[0117] b second rod length

[0118] N C normal force

[0119] R C1 reaction force (normal force)

[0120] R C2 pressure

[0121] F1 horizontal force

[0122] F T reaction force

[0123] F X overturning force

[0124] P1 first point of contact

[0125] P2 second point of contact

[0126] P A support point

[0127] μ1 first sliding friction

[0128] μ2 second sliding friction

[0129] X axial position of the piston

Claims

1. An operating device (10) for an automatic shift transmission (12) of a motor vehicle, wherein the operating device enables the selection or shifting element of the shift transmission to move, for setting a shift slot or engaging or disengaging a transmission gear, wherein, The operating device (10) has a pressure medium-driven actuator (54) having a piston (58) and a piston rod (64) connectable to the selection or shifting element of the gearbox. The piston (58) is radially hermetically arranged within a cylindrical housing (50) of the housing (18) of the operating device (10) and is coaxially movable there. A sensor system (30) with a magnet (38) and a magnetic field sensor (32) is present. The magnet (38) is arranged on the piston (58) at an end away from the piston rod by means of a holding device (44), while the magnetic field sensor (32) is arranged radially opposite the magnet (38) on the housing side. The holding device (44) is characterized in that... The retaining device (44) is connected to the piston (58) in a manner that allows it to rotate about the longitudinal central axis (52) of the receiving space (50). The retaining device (44) has a hollow cylindrical or hollow cylindrical segment geometry and contains a rod-shaped or plate-shaped anti-torsion element (80). The anti-torsion element is fitted in a corresponding recess (120) in the housing (18) with at least two of its ends locked in place. The anti-torsion element (80) is spaced from the magnet (38) and interlocked with the hollow cylindrical or hollow cylindrical segment retaining device (44) with a small gap. Thus, although axial and rotational movement of the piston (58) is possible, rotational movement of the retaining device (44) about the longitudinal central axis (52) of the receiving space (50) is prevented.

2. The operating device according to claim 1, characterized in that, The retaining device (44) has two axially oriented longitudinal ribs (90, 92), each having a flat mating surface (94, 96) pointing toward the anti-torsion element (80), and the mating surfaces (94, 96) are arranged spaced apart from each other along an imaginary secant line (98) of the retaining device (44).

3. The operating device according to claim 1 or 2, characterized in that, The housing (18) includes a lower portion (22) and an upper portion (20), which are sealed to each other by means of a sealing element (28).

4. The operating device according to claim 3, characterized in that, The lower portion (22) of the housing (18) has a wall (106) surrounding the receiving space (50) with at least one retaining pin (150) arranged radially outward and oriented axially toward the upper portion (20) of the housing (18). The anti-torsion element (80) has at least one pocket (152) on its side facing the lower portion (22) of the housing (18), and each retaining pin (150) is received in its respective associated pocket (152) and abuts against the bottom of the pocket (152) at its end.

5. The operating device according to claim 1 or 2, characterized in that, The anti-torsion element (80) has a trapezoidal geometry.

6. The operating device according to claim 5, characterized in that, The anti-torsion element (80) has an axially oriented radially deepened portion (112) on its bottom side (110) pointing toward the retaining device (44), and radially inwardly oriented contact surfaces (114, 116) are formed on the anti-torsion element (80) near both sides of the deepened portion (112).

7. The operating device according to claim 5, characterized in that, The anti-torsion element (80) is arranged in a shape-locking manner within a niche-shaped and approximately trapezoidal recess (120) in the wall (106) of the hollow columnar receiving space (50).

8. The operating device according to claim 6, characterized in that, The contact surfaces (114, 116) of the anti-torsion element (80) are positioned at least slightly gapped and parallel to the mating surfaces (94, 96) of the longitudinal ribs (90, 92) of the retaining device (44).

9. The operating device according to claim 5, characterized in that, The retaining device (44) and the anti-torsion element (80) are made of the same material.

10. The operating device according to claim 3, characterized in that, The sealing element (28) is elastically constructed and has at least two integrated structures thereon and an arch (126, 128) extending longitudinally and oriented parallel to the longitudinal central axis (52).

11. The operating device according to claim 10, characterized in that, The axial length of the two domes (126, 128) of the sealing element (28) is such that, with the upper part (20) and lower part (22) of the housing (18) of the operating device (10) assembled, the anti-torsion element (80) is mechanically pre-tightened axially relative to at least one retaining pin (150) of the lower part (22) of the housing (18) by means of the at least two domes (126, 128).

12. The operating device according to claim 10, characterized in that, The at least two domes (126, 128) are connected to and positioned with the sealing element (28) by means of a plurality of tabs (130, 132, 134, 136) integrated on the sealing element (28).

13. The operating device according to claim 1 or 2, characterized in that, The retaining device (44) has a circular through-hole (188) radially inward, and the circular through-hole is wall-bound by the annular shoulder (190) of the retaining device (44).

14. The operating device according to claim 13, characterized in that, The piston (58) has an annular neck (192) radially inward and away from the piston rod, the neck extending toward the underside of the bolt (142) but not reaching the underside of the bolt, and the annular shoulder (190) of the retaining device (44) is arranged between the underside of the bolt (142) and the neck (192) of the piston (58).

15. The operating device according to claim 1 or 2, characterized in that, The sensor system (30) can be used to measure the axial position (X) of the piston (58) within the hollow cylindrical receiving space (50) without contact.

16. The operating device according to claim 1 or 2, characterized in that, The magnetic field sensitive sensor (32) is radially arranged outside the wall (106) surrounding the hollow cylindrical receiving space (50).

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