Shaft securing arrangement for a drivetrain device of a motor vehicle, drivetrain device for a motor vehicle and motor vehicle

Abstract

The invention relates to a shaft locking arrangement (10) for a drive train device (100) of a motor vehicle (K), comprising a shaft (20) designed for transmitting torque, a shaft nut (40) which is reversibly detachably coupled to the shaft (20) via a screw connection (12) formed as a result of a first relative rotation (R1) between the shaft (20) and the shaft nut (40), and a locking element (60) which is designed to prevent a second relative rotation (R2) between the shaft (20) and the shaft nut (40) opposite to the first relative rotation (R1) and serving to loosen the screw connection (12).The locking element (60) comprises a base body (62) and at least one locking section (70) connected to the base body (62), which is elastically deformable in the axial direction (A) of the shaft (20) relative to the base body (62) and relative to the shaft (20). This locking section engages in at least one shaft-side recess (22) when the screw connection (12) is engaged or when a predetermined tolerable deviation (14) from the screw connection (12) occurs. Further aspects of the invention relate to a drive train device (100) and a motor vehicle (K).

Description

[0001] The invention relates to a shaft locking arrangement for a drivetrain device of a motor vehicle, comprising a shaft designed to transmit torque, a shaft nut that is reversibly and detachably coupled to the shaft via a screw connection formed as a result of a first relative rotation between the shaft and the shaft nut, and a locking element that is designed to prevent a second relative rotation between the shaft and the shaft nut, opposite to the first relative rotation and serving to release the screw connection. Further aspects of the invention relate to a drivetrain device for a motor vehicle and a motor vehicle.

[0002] To prevent a shaft nut from accidentally coming loose from a shaft, a locking plate is typically used. Such a locking plate has an annular body from which a plurality of tab elements are arranged equidistant from one another, projecting outwards from the annular body in the radial direction of extension. A single locking tab, which engages positively in a groove on the shaft, projects inwards from the annular body in the radial direction of extension. After a screw connection has been established between the shaft nut and the shaft, one of the tab elements is plastically deformed by being bent over and engaging in one of several recesses in the shaft nut. This provides a reverse rotation lock, in other words a lock that prevents the shaft nut from rotating relative to the shaft due to a rotational movement that loosens the screw connection and thus becoming unduly loose from the shaft.

[0003] Further solutions are known from the prior art which aim to ensure a corresponding securing function. DE 10 2019 213 117 A1 describes a securing device for a screw connection of a nut with an internal thread on a shaft with an external thread. The securing device comprises locking elements arranged on the shaft or on the nut in a uniformly circumferentially distributed manner, into which, when assembled, several tabs engage which are arranged evenly distributed on the nut or on the shaft, radially and optionally circumferentially resilient and extend axially. These tabs are designed as a single piece with the nut or shaft or are connected to the nut or shaft in a rotationally fixed manner.

[0004] DE 20 2021 105 659 U1 discloses a locking nut with a securing element as an axial securing device for an attachment element of a shaft, in particular a bearing of a transmission shaft or a wheel bearing of a cardan shaft. The locking nut can be screwed onto a threaded shaft section, in particular at the end, of the shaft in a screwing-on direction in order to clamp the attachment element axially and along a screw axis on the shaft in the assembled state. The securing element has an engagement section which, in the assembled state, engages in a recess in the shaft and holds the locking nut along a loosening direction. The locking nut supports the securing element along the screw axis, wherein the locking nut is rotatable in one direction relative to the locking element along the screwing-on direction.

[0005] The object of the present invention is to provide a shaft locking arrangement for a drive train device of a motor vehicle, a drive train device with such a shaft locking arrangement and a motor vehicle of the type mentioned at the outset, which enable a particularly compact anti-rotation device in a small available installation space.

[0006] This object is achieved by a shaft locking arrangement having the features of patent claim 1, by a drive train device having the features of patent claim 14, and by a motor vehicle having the features of patent claim 15. Advantageous embodiments with expedient further developments of the invention are specified in the subclaims.

[0007] A first aspect of the invention relates to a shaft locking arrangement for a drive train device of a motor vehicle, comprising a shaft designed to transmit torque, a shaft nut which is reversibly detachably coupled to the shaft via a screw connection formed as a result of a first relative rotation between the shaft and the shaft nut, and a locking element which is designed to prevent a second relative rotation between the shaft and the shaft nut which is opposite to the first relative rotation and serves to release the screw connection.

[0008] A first thread of the shaft nut can engage with a second thread of the shaft, thereby forming the screw connection. Preferably, the first thread can be an internal thread of the shaft nut, and the second thread an external thread of the shaft.

[0009] According to the invention, the securing element comprises a base body and at least one securing section connected to the base body, which is elastically, in particular resiliently, deformable relative to the base body in the axial direction of the shaft and relative to the shaft, and which engages in at least one shaft-side recess during the screw connection or in the event of a predetermined tolerable deviation from the screw connection. This is advantageous because the elastic deformation in the axial direction of the shaft and the engagement in the corresponding recess form a connection, in particular a locking connection, between the securing element and the shaft, wherein the at least one securing section can engage in the at least one shaft-side recess.The shaft-side recess can therefore be designed with minimal effort, since this recess only accommodates the securing section deformable in the axial direction of extension and can thus be designed, for example, as a shaft-end-side recess, in particular a bulge, that is easy to manufacture and requires little installation space; in other words, as a recess arranged on an end face of the shaft. For example, the at least one securing section can be designed as a tab that can elastically engage in the shaft-side recess in a resilient manner in the axial direction of extension. When arranged in the shaft-side recess, the at least one securing section can block the second relative rotation and release the first relative rotation.A securing section-recess arrangement in which the at least one securing section is in engagement with the at least one shaft-side recess can thus form a freewheel of the shaft securing arrangement, which can release the first relative rotation, for example during the production of the screw connection, and prevent the second relative rotation.

[0010] The screw connection can be established, for example, by rotating the shaft nut and, with it, the securing element relative to the shaft through the first relative rotation, thereby screwing the shaft nut to the shaft. In the fully established screw connection, i.e., after the completion of the first relative rotation forming the screw connection, it may happen that the at least one securing section does not engage in the at least one shaft-side recess, but is arranged next to the at least one shaft-side recess, particularly in the circumferential direction of the shaft.

[0011] Starting from the established screw connection, the second relative rotation can then take place by a predetermined and thus permissible angular amount of a central angle, which can correspond to the tolerable deviation, until the at least one securing section engages in the at least one shaft-side recess as a result of the second relative rotation. During production of the shaft securing arrangement, it can happen that the second relative rotation is thus enabled in the form of a rotary movement by the predetermined angular amount of the central angle as the tolerable deviation, until the at least one securing section engages in the at least one shaft-side recess as a result of the second relative rotation. As soon as the at least one securing section engages in the at least one shaft-side recess, the further second relative rotation is blocked and thus no longer permitted.

[0012] Loosening of the screw connection can be understood as an impermissible, at least partial loosening of the shaft nut from the shaft that goes beyond the tolerable deviation. Impermissible partial loosening can also be understood as meaning when, starting from the finished screw connection, which was formed using a predetermined tightening torque to be applied for the production of the screw connection, the second relative rotation extends over less than one revolution (360°), for example over an angular amount of the central angle of more than 10°, more than 15°, or more than 20°. In this case, the screw connection is not sufficiently secured and is therefore impermissible, which means that an intolerable deviation exists.Accordingly, impermissible loosening also occurs when the respective threads of the shaft nut and the shaft are engaged with each other, but no tightening torque characterizing the screw connection has been applied to tighten the shaft nut onto the shaft and thus to complete the screw connection. Impermissible partial loosening and thus an intolerable deviation can already occur if the second relative rotation extends beyond the angular amount of the central angle, for example, more than 2°, 3°, 4°, 5°, 6°, 7°, 8°, 9° or even 10°, with an apex of the central angle lying on a rotational axis of the shaft. In general, the shaft nut, the shaft and the locking element can have a common axis of rotation. This axis of rotation can generally be arranged coaxially to the axial extension direction.The axial extension direction of the shaft can also be the axial extension direction of the shaft nut and the locking element. Likewise, the radial extension direction and circumferential direction of the shaft can generally also be the radial extension direction and circumferential direction of the shaft nut and the locking element.

[0013] The locking element can generally be free of areas that form a positive and / or frictional connection with the shaft nut, such as projections. This simplifies the manufacturing of the locking element. Preferably, the locking element can be integrally connected to the shaft nut, for example, by welding. This enables a durable connection between the shaft nut and the locking element without the need for complex machining of the shaft nut or the locking element.

[0014] The invention is based on the finding that a shaft securing arrangement can, for example, have at least one rolling bearing, which can be clamped at least partially, for example on a rolling bearing ring, in particular a rolling bearing outer ring, between the shaft nut and a shaft shoulder of the shaft. As the torque requirements for the shaft securing arrangement and / or the drive train device comprising the shaft securing arrangement increase, so do the loads in the drive train device, which can be designed, for example, as a transmission, in particular of an electric drive train, of the motor vehicle. The torque requirements are particularly high if the drive train or the drive train device comprises an electric machine for driving the motor vehicle.The respective forces and moments acting on the components of the drive train device, and in particular on the at least one rolling bearing or several rolling bearings of the shaft locking arrangement, can lead to impermissible relative movement between the rolling bearing and the shaft. To prevent this relative movement, also known as "creeping", the rolling bearing or bearings are connected to the shaft by means of the shaft nut without play and with sufficient preload using the screw connection, for example, they are clamped between the shaft nut and the shaft shoulder and thus clamped. For safety reasons, it is important to prevent the shaft nut from becoming unduly loose, which is the case as soon as an intolerable deviation from the screw connection occurs.In other words, it is important to ensure that the preload is always above a minimum value, which can be achieved if the screw connection is manufactured with a predetermined tightening torque, or if the deviation from the screw connection and thus from the predetermined tightening torque is tolerable. Where space for the shaft nut is limited, chemical threadlockers are typically used. Chemical threadlockers require a high degree of cleanliness and a grease-free environment, which is complicated by the necessary preservation measures and may not adequately ensure the required process robustness during assembly of the shaft locking assembly.

[0015] The invention is based on this principle, since the proposed shaft locking arrangement reliably prevents the shaft nut from becoming loosened from the shaft, even in confined spaces and without the use of chemical means for screw locking.

[0016] In an advantageous development of the invention, the at least one securing section forms a first acute angle with the base body, at least in a basic state in which the at least one securing section is elastically undeformed, and a second acute angle in a deformation state in which the at least one securing section is elastically deformed. This is advantageous because the respective acute angle can prevent any bending, in particular plastic bending, of the securing section when the second relative rotation occurs at high torque values ​​and thus correspondingly large forces act on the securing section engaging in the shaft-side recess. The first acute angle can preferably have angular values ​​of, for example, 5°, 6°, 7°, 8°, 9°, 10°, 11°, 12°, 13°, 14°, 15°, 16°, 17°, 18°, 19° or 20°.The second acute angle can preferably have angle values ​​of, for example, more than 0°, 1°, 2°, 3°, 4°, 5°, 6°, 7°, 8°, 9°, 10°, 11°, 12°, 13°, 14°, 15°. The first acute angle or the second acute angle can be arranged between a center plane passing through the center of the base body and a center plane, also referred to as the section center plane, which can pass through the center of a securing section end of the respective securing section facing away from the base body.

[0017] The at least one securing section can be elastically undeformed and exhibit the first acute angle when it is not in contact with the shaft, i.e., when it is not in contact with the shaft, which can be the case, for example, at the beginning of the production of the screw connection. Likewise, the at least one securing section can be elastically undeformed and exhibit the first acute angle when the at least one securing section engages in the at least one shaft-side recess, provided this recess is sufficiently deep for the securing section to assume the elastically undeformed state while setting the first acute angle.However, it is also conceivable for the at least one securing section to be elastically deformed when it engages in the at least one shaft-side recess and in doing so to have the second acute angle, which can be the case if this recess has such a small depth in the axial direction of extension that the at least one securing section does not have sufficient space to assume the undeformed state at the first acute angle. In this case, the securing section can press against a recess base of the shaft-side recess. During the production of the screw connection and thus during the first relative rotation, the securing element can come into contact with the shaft, so that the at least one securing section can be pressed against the shaft, in particular against the end face of the shaft.As the first relative rotation continues, the at least one securing section can be increasingly elastically deformed, so that the second acute angle successively changes, in particular decreases, during the first relative rotation depending on a respective thread pitch of the mutually engaging threads of the shaft or shaft nut. As soon as the at least one securing section engages in the shaft-side recess, the securing section can deform elastically in the direction of the undeformed state, for example, rebound, so that the first acute angle or the second acute angle is established depending on the depth of the shaft-side recess. The first acute angle can be established when the at least one securing section can completely relax in its engagement in the shaft-side recess and can be arranged load-free in the shaft-side recess.The second acute angle can generally occur when at least one securing section is pressed against the shaft, i.e. exerts a force on the shaft.

[0018] In a further advantageous development of the invention, the at least one securing section has at least one elastically deformable tab region, which is undeformed in the basic state and elastically deformed in the deformed state. This is advantageous because such a tab region can be manufactured with particularly little effort and enables reliable protection against unwanted loosening. The tab region of the at least one securing section can be designed to be elastically deformable, in particular resilient, in the axial direction of the shaft, the shaft nut, and the securing element in a particularly advantageous, space-saving manner.

[0019] In a further advantageous development of the invention, the base body is designed as a ring element. This is advantageous because it enables even load distribution across the base body. The base body of the locking element can generally be integrally connected to the shaft nut, for example, welded. The design as a ring element allows for even force transmission between the base body and the shaft nut.

[0020] In a further advantageous development of the invention, the at least one shaft-side recess extends on an end face of the shaft facing the base body.

[0021] This is advantageous because it avoids structurally weakening machining of the shaft, for example on its circumferential side, on which a shaft thread (first thread) for receiving the shaft nut can be arranged. The at least one shaft-side recess has little or no influence on the load-bearing capacity, in particular the torsional strength, of the shaft if the at least one recess is arranged exclusively on the end face of the shaft facing the base body. The circumferential side can preferably be unaffected by the shaft-side recess and / or spaced apart, whereby an interruption of the shaft thread by the shaft-side recess can be avoided. It is also advantageous if the at least one shaft-side recess extends over a greater length in the radial direction of extension of the shaft on the end face than in the axial direction of extension of the shaft on the circumferential side.The circumferential side can also be referred to as the outer surface of the shaft or the cylindrical surface of the shaft. As a result, the at least one shaft-side recess does not extend over the circumferential side or only over a small section of the circumferential side, as a result of which the first thread, for example the external thread, of the shaft is not or only insignificantly impaired, in particular interrupted, by the at least one shaft-side recess. If the shaft-side recess also extends over the circumferential side, the at least one securing section can engage the shaft at a particularly large distance from a rotational axis (central axis, rotational axis) of the shaft, as a result of which a particularly large lever arm is present when the at least one securing section engages in the at least one shaft-side recess.

[0022] In a further advantageous development of the invention, the securing section is assigned to a plurality of securing sections of the securing element, wherein the plurality of securing sections comprises between 18 and 72 securing sections inclusive. This is advantageous because it results in two adjacent securing sections each having a central angle of between 20° and 5°. This advantageously greatly limits the second relative rotation, with the advantage of a correspondingly slight tolerable deviation from the screw connection. In general, all securing sections can be evenly distributed in the circumferential direction of the securing element, in particular arranged equidistant from one another.

[0023] In a further advantageous development of the invention, the shaft-side recess is assigned to a plurality of shaft-side recesses of the shaft, wherein the plurality of recesses comprises between one and 30 recesses. In conjunction with the plurality of securing sections, between 18 and 72 securing sections, just 1 to 30 recesses ensure an advantageous limitation of the second relative rotation. In general, all recesses can be evenly distributed in the circumferential direction of the securing element, in particular arranged equidistant from one another.

[0024] In a further advantageous development of the invention, the securing section is assigned to a plurality of securing sections of the securing element, wherein the plurality of securing sections comprises between 1 and 30 securing sections. This is advantageous because a correspondingly low-effort machining of the securing element is sufficient to provide 1 to 30 securing sections.

[0025] In a further advantageous development of the invention, the shaft-side recess is assigned to a plurality of shaft-side recesses of the shaft, wherein the plurality of recesses comprises between 18 and 72 recesses. This is advantageous because, as a result, any two adjacent recesses of the plurality of recesses each have a central angle relative to the shaft of between 20° and 5°. This advantageously greatly limits the second relative rotation, with the advantage of a correspondingly small tolerable deviation from the screw connection.

[0026] In a further advantageous development of the invention, a different number of shaft-side recesses and securing sections are provided. This is advantageous because it ensures that not all shaft-side recesses engage with all securing sections at the same time, thereby facilitating assembly and disassembly of the shaft nut and the securing element on or from the shaft. To avoid all shaft-side recesses engaging with all securing sections at the same time, it has proven particularly advantageous to provide either an even number of shaft-side recesses and an odd number of securing sections, or conversely, an odd number of shaft-side recesses and an even number of securing sections.For example, 24 shaft-side recesses can be evenly distributed in the circumferential direction, while 21 securing sections are evenly distributed in the circumferential direction. Conversely, alternatively, 21 shaft-side recesses can be evenly distributed in the circumferential direction, while 24 securing sections are evenly distributed in the circumferential direction.

[0027] Preferably, the locking element has a double-digit number of locking sections, and the shaft has a double-digit number of shaft-side recesses. This reliably ensures that the second relative rotation is reliably limited and thus the tolerable deviation from the screw connection can be maintained.

[0028] In a further advantageous development of the invention, the shaft locking arrangement comprises at least one rolling bearing, of which at least one bearing ring is clamped by the screw connection and between the shaft nut and a shaft section of the shaft. This allows for particularly low-friction mounting of the shaft. Preferably, the shaft locking arrangement can have at least two rolling bearings, each clamped between the shaft nut and the shaft section. Optionally, the rolling bearings can form a so-called X-arrangement, an O-arrangement, or a tandem arrangement, as required. The shaft section can be designed as a shaft shoulder.

[0029] In a further advantageous development of the invention, the at least one securing section has, at least in some regions, a substantially rectangular or trapezoidal outer contour. This is advantageous because it has been shown that, with such a shaped outer contour, improved torsional properties of the securing section occur when blocking the second relative rotation. As a result, a higher value of a reverse torque applied during the undesired reverse rotation according to the second relative rotation can be supported by the at least one securing section without causing significant deformation of the securing section in the axial direction. Instead, a targeted torsion of the securing section, at least in some regions, can occur.

[0030] In a further advantageous development of the invention, the at least one securing section has a tapered area at least in some regions. The tapered area advantageously contributes to improved spring properties of the at least one securing section.

[0031] A second aspect of the invention relates to a drivetrain device for a motor vehicle with a shaft locking arrangement according to the first aspect of the invention. Such a drivetrain device enables a particularly compact anti-rotation device in a limited available space.

[0032] A third aspect of the invention relates to a motor vehicle with a shaft locking arrangement according to the first aspect of the invention and additionally or alternatively with a drivetrain device according to the second aspect of the invention. The drivetrain device and additionally or alternatively the shaft locking arrangement of such a motor vehicle enable a particularly compact anti-rotation device in a limited available space.

[0033] The preferred embodiments and their advantages presented with respect to one of the aspects apply accordingly to the other aspects of the invention and vice versa.

[0034] The features and combinations of features mentioned above in the description as well as the features and combinations of features mentioned below in the description of the figures and / or shown alone in the figures can be used not only in the respective combination specified, but also in other combinations or on their own, without departing from the scope of the invention.

[0035] Further advantages, features and details of the invention emerge from the claims, the following description of preferred embodiments and from the drawings.

[0036] The invention is explained once again below using a specific embodiment. This shows: Fig. 1 a schematic representation of a motor vehicle with a drive train device and a shaft locking arrangement shown in a schematic perspective representation, which comprises a shaft, a shaft nut forming a screw connection with the shaft and a locking element integrally connected to the shaft nut; Fig. 2 a sectional view of the shaft securing arrangement according to a sectional plane which runs along an axial extension direction of the shaft securing arrangement and thus along an axis of rotation of a shaft of the shaft securing arrangement; Fig. 3 a further sectional view according to the sectional plane running along the axial extension direction and thus along a rotation axis, without the securing element, whereby respective shaft-side recesses arranged on an end face of the shaft can be seen; Fig. 4 a schematic perspective view of the securing element, on whose base body, designed as a ring element, a plurality of projections in the form of securing sections protrude inwards in the radial direction of extension; Fig. 5 a side view of an enlarged section of the securing element, wherein one of three securing sections shown engages at least partially in one of the shaft-side recesses; Fig. 6 an abstract representation of the shaft-side recesses and the securing sections of the securing element of a first variant of the shaft securing arrangement; Fig. 7 an abstract representation of the shaft-side recesses and the securing sections of the securing element of a second variant of the shaft securing arrangement; Fig. 8 an abstract representation of the shaft-side recesses and the securing sections of the securing element of a third variant of the shaft securing arrangement; Fig. 9 an abstract representation of the shaft-side recesses and the securing sections of the securing element of a fourth variant of the shaft securing arrangement; Fig. 10 an abstract representation of the shaft-side recesses and the securing sections of the securing element of a fifth variant of the shaft securing arrangement; Fig. 11 an abstract representation of the shaft-side recesses and the securing sections of the securing element of a sixth variant of the shaft securing arrangement Fig. 12 a schematic perspective view of a further variant of the securing element, the securing sections of which have, in plan view along the axial extension direction, at least in some regions and substantially rectangular or trapezoidal outer contour and protrude inwards in the radial extension direction; Fig. 13 a schematic perspective view of a further variant of the shaft, the shaft-side recesses of which have a substantially rectangular or trapezoidal inner contour in plan view along the axial extension direction, which corresponds to the outer contour of the variant of the shaft shown in Fig. 12 shown fuse sections; and Fig. 14 a further schematic perspective view of a variant of the shaft securing arrangement, which Fig. 12 shown variant of the securing element as well as the Fig. 13 shows the variant of the shaft.

[0037] Fig. 1 shows an abstract representation of a motor vehicle K with a drive train device 100, which is also shown in an abstract representation. The drive train device 100 can be a component, for example a transmission or an electric drive machine, also called an electric motor, of a drive train of the motor vehicle K. In a schematic perspective view, Fig. 1 also a shaft securing arrangement 10 of the drive train device 100 and thus also of the motor vehicle K.

[0038] The shaft locking assembly 10 has a shaft 20 which is designed to transmit torque. A shaft nut 40 of the shaft locking assembly 10 is screwed to the shaft 20, thereby forming a Fig. 2, a screw connection 12 is formed between the shaft 20 and the shaft nut 40. A first thread of the shaft nut 40, designed as an internal thread, engages with a second thread of the shaft 20, designed as an external thread, and forms the screw connection 12, via which the shaft 20 and the shaft nut 40 are reversibly detachably coupled to one another. Between a Fig. Two roller bearings 96, 98 of the shaft locking arrangement 10 are clamped and thus locked between the shaft section 23 of the shaft 20, which can be seen in FIG. 2 and is designed as a shaft shoulder, and the shaft nut 40 by the screw connection 12, which can also be referred to as a screw connection. Of these roller bearings 96, 98, an unnumbered bearing ring in the form of an inner ring of the respective roller bearings 96, 98 is clamped by the screw connection 12 and between the shaft nut 40 and the shaft section 23 of the shaft 20, i.e., subjected to a predetermined preload.

[0039] In order to produce and thus form the screw connection 12, the respective first and second threads are contacted with each other and a relative rotational movement in the form of a first relative rotation R1 is carried out between the shaft 20 and the shaft nut 40.

[0040] The Fig. 1 with a curved arrow refers here to the shaft nut 40. A second relative rotation R2, which serves to loosen the screw connection and is opposite to the first relative rotation R1, is indicated by a further curved arrow in Fig. 1 clarifies and also refers to the shaft nut 40.

[0041] If the shaft locking arrangement 10 is to be disassembled - for example to replace the rolling bearings 96, 98 - it may be necessary to loosen the screw connection 12 by performing the second relative rotation R2 between the shaft 20 and the shaft nut 40 until the respective first and second threads no longer engage with each other and thus the shaft nut 40 is released from the shaft 20.

[0042] However, in order to avoid an undesirable reduction in the preload, which is maintained by the screw connection 12 formed with sufficient tightening torque and by which the rolling bearings 96, 98 are reliably and properly clamped between the shaft nut 40 and the shaft section 23 (here: shaft shoulder), even during dynamic driving of the motor vehicle K, for example, the shaft locking arrangement 10 additionally has a locking element 60. The locking element 60 can advantageously be manufactured as a stamped and bent part with particularly low expenditure.

[0043] The securing element 60 can generally be integrally connected to the shaft nut 40, thereby creating a particularly durable connection between the shaft nut 40 and the securing element 60. This also results in advantages during assembly and disassembly of the shaft securing arrangement 10, especially since the securing element 60 can be moved in conjunction with the shaft nut 40 and can be assembled and disassembled in the process. Preferably, the securing element 60 can be integrally connected to the shaft nut 40 in a particularly stable manner by means of a welded connection.

[0044] Examples include Fig. 2, an axial extension direction A, a radial extension direction R and a circumferential direction U of the securing element 60, the shaft 20 and the shaft nut 40 are each indicated by double arrows.

[0045] The securing element 60, which is designed to prevent the second relative rotation R2 between the shaft 20 and the shaft nut 40, which is opposite to the first relative rotation R1 and serves to release the screw connection 12, is in Fig. 4 isolated and shown in schematic perspective view, whereas Fig. 5 shows an enlarged section of the securing element 60 in side view and thus along the radial extension direction R.

[0046] The securing element 60 has a base body 62 designed as a ring element. At this base body 62, the securing element 60 is integrally connected to the shaft nut 40. Numerous securing sections 70 of a plurality of securing sections 80 of the securing element 60 extend inwardly from this base body 62 in the radial direction R.

[0047] The securing sections 70, which are generally connected in one piece to the base body 62, some of which are Fig. 5 can be seen in an enlarged view, are elastically deformable in the axial extension direction A relative to the base body 62 and relative to the shaft 20.

[0048] At least one, preferably several, securing sections 70 engage, at least in part, in respective shaft-side recesses 22 of the shaft 20 in the finished screw connection 12 or in the case of a predetermined tolerable deviation 14 from the screw connection 12, for example with a respective securing section end 71 of the respective securing sections 70. The shaft-side recesses 22 are arranged on an end face 21 of the shaft 20 facing the securing element 60.

[0049] In general, the shaft-side recesses 22 extend on the end face 21 associated with the shaft 20, wherein the end face 21 faces the base body 62, as can be seen, for example, by looking at Fig. 1 and Fig. 2 is recognizable.

[0050] All securing sections 70 are assigned to the securing section plurality 80 of securing sections 70 of the securing element 60. In contrast, all shaft-side recesses 22 are assigned to a recess plurality 30 of shaft-side recesses 22 of the shaft 20.

[0051] Fig. 4 and Fig. 5 shows the securing sections 70 of the plurality of securing sections 80 partially in a basic state 72, in which the securing sections 70 are elastically undeformed. In this basic state 72, the securing section ends 71 ​​of the respective securing sections 70 form a first acute angle α1 with the base body 62. In the present case, each of the securing sections 70 has an elastically deformable tab region 76, which is undeformed in the basic state 72. The securing section ends 71 ​​are assigned to the respective tab regions 76.

[0052] It is generally particularly advantageous that the tab regions 76, in particular in a flag-like manner, are oriented in the direction of the second relative rotation R2, i.e. in other words in the direction of an arrow marking the second relative rotation R2, as well as in the circumferential direction U. In other words, the securing section ends 71 ​​protrude in the direction of the second relative rotation R2 and in the circumferential direction U. As a result of this orientation, the securing sections 70, when they come into contact with the shaft 20, in particular the end face 21 of the shaft 20, form a freewheel which permits the first relative rotation R1, in that the securing section ends 71 ​​can sweep over the shaft-side recesses 22 - for example during the production of the screw connection 12.In this case, the securing sections 70 can briefly engage with their securing section ends 71 ​​in the shaft-side recesses 22, but can slide out of the respective recess 22 again upon continued first relative rotation R1. However, during the opposite second relative rotation R2, the securing sections 70 with their securing section ends 71 ​​do not slide out of the respective shaft-side recesses 22 again upon engagement. During assembly, the securing sections 70 slide along the end face 21 while the screw connection 12 is being tightened.

[0053] If a respective securing section 70 with its respective securing section end 71 is in engagement with a respective shaft-side recess 22, such an arrangement of the securing section 70 in the shaft-side recess is described below and with respect to various variants in Fig. 6, Fig. 7, Fig. 8, Fig. 9, Fig. 10 and Fig. 11 as the securing section-recess arrangement 90. This securing section-recess arrangement 90 prevents the second relative rotation R2. In other words, as soon as one of the securing sections 70 overlaps with one of the shaft-side recesses 22 in the axial direction of extension A, the corresponding securing section 70 engages, forming the securing section-recess arrangement 90.

[0054] In a deformation state 74 in which the securing sections 70 are elastically deformed, the securing section ends 71 ​​of the respective securing sections 70 form a second acute angle α2 with the base body 62. In the present case, the respective elastically deformable tab regions 76 are elastically deformed in the deformation state 74.

[0055] The first acute angle α1 or the second acute angle α2 can be arranged between a center plane 64 passing through the center of the base body 62 and a center plane, also referred to as section center plane 66, which can pass through the center of a securing section end 71 of the securing section 70 facing away from the base body 62.

[0056] In order to clarify the ground state 72, the deformation state 74 and the respective first and second acute angles α1 and α2, Fig. 5, in addition to the enlarged section of the securing element 60, also schematically and in detail the end face 21 of the shaft 20, as well as one of the shaft-side recesses 22 are shown, in which in the present case the lowest of the Fig. 5, engages at least partially. It can be seen that two of the three securing sections 70 shown there exhibit the deformation state 74. The deformation state 74 arises in the present case because these two securing sections 70 are pressed against the end face 21 of the shaft in the finished screw connection 12 and are thereby elastically deformed, resulting in the second acute angle α2 between the center plane 64 and the section center plane 66.

[0057] The lowest security section 70 of the Fig. 5, however, is elastically undeformed, whereby the first acute angle α1 is established between the center plane 64 and the section center plane 66. This lowermost securing section 70 engages in the Fig. 5, which can be deep enough in the axial direction of extension A for the securing section 70 to assume the elastically undeformed basic state 72 while setting the first acute angle α1. Alternatively, however, it can also be provided that the at least one securing section 70 is elastically deformed when it engages in the at least one shaft-side recess 22 and in doing so has the second acute angle α2, although this is not shown in more detail here. This can occur if this recess 22 has such a small depth in the axial direction of extension A that the at least one securing section 70 does not have sufficient space to assume the basic state 72, also referred to as the undeformed state, at the first acute angle α1.

[0058] In general, it can be provided that the securing section plurality 80 comprises between 18 and 72 securing sections 70, while the recess plurality 30 can comprise between 1 and 30 recesses 22.

[0059] Alternatively, the securing section plurality 80 may comprise between 1 and 30 securing sections 70, while the recess plurality 30 may comprise between 18 and 72 recesses 22.

[0060] Based on Fig. 6, Fig. 7, Fig. 8, Fig. 9, Fig. 10 and Fig. 11 shows an abstract representation of various variants, each with a different number of shaft-side recesses 22 and a different number of securing sections 70. The shaft-side recesses 22 are shown as points arranged next to one another in the radial direction R, whereas each securing section 70 is shown as a single cross.

[0061] Within the framework of these abstract representations, which serve to improve recognition, the securing section-recess arrangements 90 are shown below, i.e. those arrangements in which one of the securing sections 70 engages in one of the shaft-side recesses 22 and thereby secures the proper screw connection 12 against loosening, i.e. prevents the undesired rotational movement according to the second relative rotation R2. Fig. 6 to Fig. 11 of one of the securing sections 70 or securing elements 60 shown as a respective cross between respective points arranged next to one another in the radial direction of extension R, which illustrate one of the shaft-side recesses 22, then one of the securing section-recess arrangements 90 is present, in which one of the respective securing sections 70 preferably engages with its securing section end 71 and thus with its tab area 76 in one of the respective shaft-side recesses 22. For reasons of clarity, only in Fig. 6 a central angle δ is shown, whereby a tolerable deviation 14 can correspond to an angular amount of the central angle δ of, for example, 2°.

[0062] In the Fig. In the first variant shown in Figure 6, the shaft 22 has a total of 21 shaft-side recesses 22 of the recess plurality 30, whereas the securing element 60 has a total of 24 securing sections 70 of the securing section plurality 80.

[0063] In the Fig. In the second variant shown in Figure 7, the shaft 22 has a total of 15 shaft-side recesses 22 of the recess plurality 30, whereas the securing element 60 has a total of 36 securing sections 70 of the securing section plurality 80.

[0064] In the Fig. In the third variant shown in Fig. 8, the shaft 22 has a total of 21 shaft-side recesses 22 of the recess plurality 30, whereas the securing element 60 has a total of 27 securing sections 70 of the securing section plurality 80.

[0065] In the Fig. In the fourth variant shown in Fig. 8, the shaft 22 has a total of 15 shaft-side recesses 22 of the recess plurality 30, whereas the securing element 60 has a total of 27 securing sections 70 of the securing section plurality 80.

[0066] Fig. 10 shows a variant according to the first Fig. 6 reversed arrangement in the form of a fifth variant, in which the shaft 22 has a total of 24 shaft-side recesses 22 of the recess plurality 30, whereas the securing element 60 has a total of 21 securing sections 70 of the securing section plurality 80.

[0067] In the Fig. In the sixth variant shown in Figure 11, the shaft 22 has a total of 12 shaft-side recesses 22 of the recess plurality 30, whereas the securing element 60 has a total of 45 securing sections 70 of the securing section plurality 80.

[0068] In the overview of the different variants in Fig. 6 to Fig. 11 it can be seen that in each variant there are advantageously at least three securing section-recess arrangements 90 evenly distributed in the circumferential direction U, wherein all shaft-side recesses 22 are arranged evenly on the shaft 20 in the circumferential direction U and all securing sections 70 are arranged evenly along the base body 62 in the circumferential direction U.

[0069] In summary, the securing element 60 forms a fan-shaped locking disc, which is preferably welded to the shaft nut 40 or connected by other joining techniques.

[0070] Each securing section 70 may be designed as a resilient fan element, as in Fig. 4. At least one of the securing sections can engage in at least one of the shaft-side recesses 22, which are formed as a correspondingly shaped groove and arranged on the end face 21 of the shaft 20, as soon as the shaft nut 40 has reached its final position and the screw connection 12 is thus completed. This engagement forms the securing section-recess arrangement 90.

[0071] Alternatively, the securing section-recess arrangement 90 can only be formed in the form of a reverse rotation at the tolerable deviation 14, i.e., at the second relative rotation R2, as soon as the tolerable deviation 14 is reached. The positive connection then created by the securing section-recess arrangement 90 between the shaft 20 or its respective shaft-side recess 22 and the respective securing section 70 prevents further reverse rotation of the shaft nut 40 during the second relative rotation R2.In order to ensure that the possible reverse rotation does not exceed the tolerable deviation 14 specified by a defined and thus predetermined angle, the grooves in the form of the shaft-side recesses 22 formed on the end face 21 of the shaft 20 are not arranged at the same angular distance as the securing sections 70 formed as individual compartments on the annular base body 62, but with other angular distances that are smaller or larger than those of the securing sections 70 arranged next to one another in the circumferential direction U.

[0072] For example, 36 securing sections 70 (compartments) can have a uniform angular spacing of 10° in the circumferential direction U, as is the case, for example, in Fig. 7. The back rotation may, for example, only occur within the tolerable deviation 14 of 5° and may not exceed this. In this case, for example, two approximately opposite shaft-side recesses 22 in the form of grooves would be required, one of which would be in a basic position of 0° and a second in a further basic position at 180°-10°+5° = 175° rotated in the circumferential direction U. If the permissible back rotation were 2°, then the second groove (recess 22) would have to be arranged at a distance of 180°-10°+2°=172°.

[0073] Fig. 12, Fig. 13 and Fig. 14 each show a schematic perspective view of a further variant of the securing element 60, the shaft 20 and the shaft securing arrangement 10. With reference to Fig. 14 and when viewed perpendicularly along the axial extension direction A and thus perpendicular to the end face 21, it can be seen that the securing element 60 has essentially rectangular or trapezoidal tab regions 76, in other words tab regions 76 with an essentially rectangular or trapezoidal outer contour 77. The expression "essentially rectangular or trapezoidal" in this context is to be understood as meaning that respective corner angles deviate by less than 20° from an exact rectangular shape, in which the corner angles amount to 90°. Accordingly, the corner angles can have values ​​between 70° and 110° inclusive, so that, for example, a diamond-shaped outer contour 77 can also be understood by this expression. The shaft-side recesses 22 of the further variant of the shaft 20 are shaped in a complementary manner.

[0074] The tab regions 76 are connected, in particular in one piece, to the base body 62 via a respective tapered region 78, i.e. a region of the respective securing section 70 which, when viewed from above along the axial extension direction A, is tapered compared to the tab region 76. It has been shown that such a tapered region 76 generally and independently of the shape of the securing section 70 brings with it the advantage of a deliberately reduced rigidity, in particular torsional rigidity, which results in improved deformation properties during the anti-rotation lock, for example during a torsion of the securing section end 71 relative to the base body 62 during the anti-rotation lock, i.e. while the securing section 70, with its tab region 76, is in engagement with the shaft-side recess 22 and blocks the second relative rotation R2.A further advantage of the essentially rectangular or trapezoidal tab regions 76, which are preferably inclined in a ramp-like manner in the basic state 72 in the axial extension direction A, is that a tolerable back torque during the second relative rotation R2 is higher than during the second relative rotation R2. Fig. 1, Fig. 2, Fig. 4 and Fig. 5. In addition, the deformation from the basic state 72 to the deformation state 74 is possible with less space requirement, since the rectangular or trapezoidal tab areas 76 are deformed less in the axial direction A, but instead the securing sections 70 can be twisted more strongly. The corresponding, in Fig. The shaft-side recesses 22 shown in Figure 13 according to the variant can be produced with little effort by means of a form milling cutter on the end face 21 of the shaft 20. List of reference symbols 10 Shaft securing arrangement 12 screw connection 14 tolerable deviation 20 Wave 21 Front side 22 shaft-side recess 23 wave section 30 Recess-plurality 40 shaft nut 60 securing element 62 basic bodies 64 Middle Level 66 Section center plane 70 security section 71 End of security section 72 Ground state 74 Deformation state 76 tab area 77 Outer contour 78 Rejuvenation area 80 Security section plurality 90 Fuse section recess arrangement 96 first rolling bearing 98 second rolling bearing 100 Drivetrain device K Motor vehicle A Axial extension direction R radial extension direction R1 first relative rotation R2 second relative rotation U circumferential direction α1 first acute angle α2 second acute angle δ central angle QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] DE 10 2019 213 117 A1

[0003] DE 20 2021 105 659 U1

[0004]

Claims

[1] Shaft securing arrangement (10) for a drive train device (100) of a motor vehicle (K), with a shaft (20) designed to transmit torque, with a shaft nut (40) which is reversibly detachably coupled to the shaft (20) via a screw connection (12) formed as a result of a first relative rotation (R1) between the shaft (20) and the shaft nut (40), and with a securing element (60) which is designed to prevent a second relative rotation (R2) between the shaft (20) and the shaft nut (40) which is opposite to the first relative rotation (R1) and serves to release the screw connection (12), characterized byin that the securing element (60) has a base body (62) and at least one securing section (70) which is elastically deformable relative to the base body (62) and relative to the shaft (20) in the axial extension direction (A) of the shaft (20), is connected to the base body (62) and engages in at least one shaft-side recess (22) in the case of the screw connection (12) or in the case of a predetermined tolerable deviation (14) from the screw connection (12). [2] Shaft securing arrangement (10) according to claim 1, characterized by that the at least one securing section (70) encloses a first acute angle (α1) with the base body (62) at least in a basic state (72) in which the at least one securing section (70) is elastically undeformed, and a second acute angle (α2) in a deformation state (74) in which the at least one securing section (70) is elastically deformed. [3] Shaft securing arrangement (10) according to claim 2, characterized by that the at least one securing section (70) has at least one elastically deformable tab region (76) which is undeformed in the basic state (72) and elastically deformed in the deformation state (74). [4] Shaft securing arrangement (10) according to one of the preceding claims, characterized by that the base body (62) is designed as a ring element. [5] Shaft securing arrangement (10) according to one of the preceding claims, characterized by that the at least one shaft-side recess (22) extends on an end face (21) of the shaft (20) facing the base body (62). [6] Shaft securing arrangement (10) according to one of the preceding claims, characterized bythat the securing section (70) is assigned to a securing section plurality (80) of securing sections (70) of the securing element (60), wherein the securing section plurality (80) comprises between 18 and 72 securing sections (70) inclusive. [7] Shaft securing arrangement (10) according to one of the preceding claims, characterized by that the shaft-side recess (22) is assigned to a plurality of recesses (30) of shaft-side recesses (22) of the shaft (20), wherein the plurality of recesses (30) comprises between 1 and 30 recesses (22) inclusive. [8] Shaft securing arrangement (10) according to one of claims 1 to 5, characterized by that the securing section (70) is assigned to a securing section plurality (80) of securing sections (70) of the securing element (60), wherein the securing section plurality (80) comprises between 1 and 30 securing sections (70) inclusive. [9] Shaft securing arrangement (10) according to one of claims 1 to 5 or according to claim 8, characterized by that the shaft-side recess (22) is assigned to a plurality of recesses (30) of shaft-side recesses (22) of the shaft (20), wherein the plurality of recesses (30) comprises between 18 and 72 recesses (22) inclusive. [10] Shaft securing arrangement (10) according to claim 7 in its reference to claim 6 or according to claim 9 in its reference to claim 8, characterized by that different numbers of shaft-side recesses (22) and securing sections (70) are provided. [11] Shaft securing arrangement (10) according to one of the preceding claims, characterized by that the shaft securing arrangement (10) comprises at least one rolling bearing (96, 98), of which at least one bearing ring is clamped by the screw connection (12) and between the shaft nut (40) and a shaft section (23) of the shaft (20). [12] Shaft securing arrangement (10) according to one of the preceding claims, characterized by that the at least one securing section (70) has, at least in some regions, a substantially rectangular or trapezoidal outer contour (77). [13] Shaft securing arrangement (10) according to one of the preceding claims, characterized by that the at least one securing section (70) has a tapered region (78) at least in some areas. [14] Drive train device (100) for a motor vehicle (K) with a shaft securing arrangement (10) according to one of claims 1 to 13. [15] Motor vehicle (K) with a shaft securing arrangement (10) according to one of claims 1 to 13 and / or with a drive train device (100) according to claim 14.

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