Drive, in particular spindle drive, for adjusting a locking element of a motor vehicle

Abstract

The invention relates to a drive, in particular a spindle drive, for adjusting a closure element (3) of a motor vehicle (4), wherein the drive (2) has an electric drive motor (8), a drive housing (13) and a cable grommet (1), wherein the cable grommet (1) has a body-side cable grommet connection (16), a drive-side cable grommet connection (17) and a protective hose (18) extending from the body-side cable grommet connection (16) to the drive-side cable grommet connection (17) along a geometric center line (M), wherein a guide channel (19) for guiding at least one electrical line (20) extends through the body-side cable grommet connection (16), the drive-side cable grommet connection (17) and the protective hose (18).It is proposed that the drive-side cable grommet connection (17) is designed in several parts with an axial protective hose section (21) and a clamping sleeve (22) axially secured to the drive housing (13), that the protective hose section (21) is inserted from the outside into a housing clamping section (24) formed by a housing recess (23) of the drive housing (13), and that the clamping sleeve (22) is inserted from the inside into the housing clamping section (24), so that the protective hose section (21) and the clamping sleeve (22) axially overlap in the housing clamping section (24), and that the protective hose (18) has a hose wall (25), and the hose wall (25) is radially clamped in the region of the protective hose section (21) between the clamping sleeve (22) and the housing clamping section (24) or between two sections of the clamping sleeve (22).

Description

The present invention relates to a drive, in particular a spindle drive, for adjusting a closure element of a motor vehicle according to the preamble of claim 1 and to a cable bushing for an electromotive drive, in particular a spindle drive, for adjusting a closure element of a motor vehicle according to the preamble of claim 13.The term "closure element" is to be understood broadly in the present case. It comprises, for example, a tailgate, a rear cover, a bonnet, a side door, a cargo compartment flap, a window pane, a lifting roof or the like of a motor vehicle. The field of application of the adjustment of a tailgate of a motor vehicle is in the foreground below.Especially in the field of application of the adjustment of a tailgate, the drive is arranged in the wet range, for example in a region located laterally to a tailgate opening. This results in particularly high requirements for the drive with regard to avoiding the entry of moisture into the drive housing.The known prior art (DE 10 2020 131 723 A1), on which the invention starts out, relates to a drive in the form of a spindle drive for adjusting a closure element of a motor vehicle, which has an electric drive motor, a drive housing with a housing cover and a cable bushing. The cable grommet has a protective hose which extends from a vehicle body-side cable grommet connection to a drive-side cable grommet connection and enables at least one electrical line which leads from the motor vehicle to the drive motor of the drive to be passed through.It is a challenge to design the mounting of the drive-side cable grommet connection as efficiently as possible. The drive-side cable bushing connection can be connected to the housing cover by a plug connection in the prior art. In order to prevent undesired pulling out of the housing cover, the drive-side cable bushing connection is positively secured by an engagement section on the ball socket of the drive connection. For this purpose, after the insertion of the drive-side cable bushing connection, the ball socket with the engagement section must be pushed laterally into the housing cover. In order to prevent moisture from entering the drive, the plug connection must also be sealed.The invention is based on the problem of configuring and developing the known drive in such a way that the assembly of the drive-side cable grommet connection is optimized.The above problem is solved by the features of the characterizing part of claim 1.The fundamental consideration is that a clamping connection is provided with which the protective hose is held in a frictionally locking manner. For this purpose, the protective tube is either held in a frictionally locking manner between clamping sleeve and housing clamping section or between two sections of the clamping sleeve which are radially spaced apart from one another. In the first case, in the assembled state, a constriction is provided between clamping sleeve and housing clamping section, which produces the clamping of the tube wall. For this purpose, in order to effect the clamping, the radial outer side of the clamping sleeve, in particular of the sleeve main body described below, has a cross-sectional widening and / or the housing clamping section has a cross-sectional narrowing, by means of which, when the hose wall of the protective hose section is arranged between the latter, the clamping sleeve and the housing clamping section are prestressed against one another. The prestressing force with which the clamping sleeve is then prestressed against the housing clamping section then corresponds to the contact pressure with which the clamping sleeve, on the one hand, and the housing clamping section, on the other hand, press against the tube wall (clamping force). In the latter case, here and preferably in order to effect the clamping, the two sections of the clamping sleeve are shaped such that they are prestressed against one another when the tube wall of the protective tube section is arranged between them. The prestressing force with which the two sections are then prestressed corresponds to the contact pressure with which one section, in particular the sleeve main body, and the other section in each case presses against the tube wall. Such a clamping connection has the advantage that, in addition to the frictional engagement-based holding effect, which allows simple fixing of the protective tube on the drive housing, it simultaneously also increases the tightness in the region of the clamping and can thereby make it difficult or prevent moisture from entering the interior of the drive or drive housing.In detail, it is proposed that the drive-side cable bushing connection is designed in multiple parts with an axial protective tube section and a clamping sleeve axially secured to the drive housing, that the protective tube section is introduced from the outside into a housing clamping section formed by a housing recess of the drive housing and the clamping sleeve is introduced from the inside into the housing clamping section, so that the protective tube section and clamping sleeve overlap axially in the housing clamping section, and that the protective tube has a tube wall and the tube wall is radially clamped between clamping sleeve and housing clamping section or between two sections of the clamping sleeve in the region of the protective tube section.Claim 2 relates to preferred embodiments of the clamping sleeve. Particularly preferably, a sleeve collar is provided which serves for the positive, internal contact with the drive housing and makes it more difficult to remove the protective hose from the drive housing. In addition, the tightness can be increased by providing a sleeve collar, in particular if the sleeve collar is connected to the drive housing in a materially bonded manner, for example by welding or adhesive bonding.Claims 3 to 5 define a holding section of the clamping sleeve and indicate particularly preferred embodiments thereof. The necessary contact pressure can be generated in a simple manner via this functional section in order to hold the protective tube securely in a frictionally locking manner, namely preferably between clamping sleeve and housing clamping section (claim 4) or between two sections of the clamping sleeve (claim 5).In claims 6 and 7, further functional sections of the clamping sleeve are defined, such as a section with a cross-sectional constriction and an insertion section. These further functional sections allow the functionality of the clamping sleeve to be further optimized with regard to the clamping effect and with regard to the assembly.Claims 8 and 9 relate to particularly preferred variants of the coupling of the clamping sleeve to the drive housing, by means of which the removal of the protective tube from the drive housing can be made more difficult.In claims 10 and 11, the construction of the drive housing is more precisely described in the area of the fastening of the protective hose.According to the particularly preferred embodiment according to claim 12, the protective tube is designed at least in sections in the manner of a corrugated tube, whereby the tube wall can be clamped particularly firmly.According to a further teaching according to claim 13, which is of independent significance, a cable bushing for an electromotive drive, in particular a spindle drive, is claimed for adjusting a closure element of a motor vehicle.It is essential here that the drive-side cable bushing connection is designed in multiple parts with an axial protective hose section and a clamping sleeve axially secured to the drive housing, that the protective hose section can be introduced from the outside into a housing clamping section formed by a housing recess of the drive housing and the clamping sleeve can be introduced from the inside into the housing clamping section, so that the protective hose section and clamping sleeve overlap axially in the housing clamping section, and that the protective hose has a hose wall and the hose wall can be radially clamped in the region of the protective hose section between clamping sleeve and housing clamping section or between two sections of the clamping sleeve.Reference may be made to all explanations concerning the proposed drive.The invention is explained in more detail below with reference to a drawing which merely represents exemplary embodiments. The drawing shows FIG. 1 shows the rear region of a motor vehicle with a drive according to the proposal for adjusting a closure element which has a cable bushing according to the proposal, FIG. 2 shows the drive according to FIG. 1 in an orientation a) when the closure element is in the closed position and b) when the closure element is in the open position, FIG. 3 shows a detailed illustration of the cable grommet according to the proposal and an enlarged cutout illustrating the connection region of cable grommet and drive housing of the drive according to the proposal, and FIG. 4 shows in each case, in an enlarged detail of the connecting region a) corresponding to FIG. 3, a further exemplary embodiment of the drive according to the proposal and b) yet a further exemplary embodiment of the drive.The cable bushing 1 shown in FIGS. 2 to 4 is part of a drive 2, here a spindle drive shown in FIG. 2, for adjusting a closure element 3 of a motor vehicle 4 (FIG. 1 ). The closure element 3 is here and preferably a tailgate. All explanations concerning a tailgate also apply here to all other types of closure elements 3 of a motor vehicle 4.The drive 2 serves for adjusting the tailgate. For this purpose, the drive 2 is articulated on the closure element 3 on the one hand via a first drive connection 5 and on the motor vehicle body 7 on the other hand via a second drive connection 6. The drive 2 generates linear drive movements here and preferably along a geometric drive axis S, so that the closure element 3 can be adjusted between a closed position and the open position shown in FIG. 1. This adjustment is effected by means of an electric drive motor 8, which is part of a drive unit 9 of the drive 2 and generates a drive force which causes the adjustment of the closure element 3.Here and preferably, the drive unit 9, downstream of the drive motor 8, has, in terms of drive technology, one or more further drive unit components such as an intermediate transmission 10, for example a planetary transmission, a brake 11, a clutch or the like.Furthermore, a feed gear 12, which is explained in more detail below, is connected downstream of the drive unit 9 in terms of drive technology. The feed gear 12 is arranged together with at least the drive motor 8, in particular the entire drive unit 9, in a common drive housing 13 of the drive 2, which is here and preferably telescopic and in particular tubular. For this purpose, the drive housing 13 here has an in particular tubular, outer housing part 14 and an in particular tubular, inner housing part 15. The term "telescopic" in this context means that the outer housing part and the inner housing part 15 are displaceable relative to one another along the geometric drive axis S, wherein the inner housing part 15 is guided in the outer housing part.Furthermore, the drive 2, as is illustrated in the views in FIGS. 2 and 3, has said cable sleeve 1.The exemplary embodiment illustrated in the figures and thus preferred relates to a drive 2, in particular a spindle drive, for adjusting a closure element 3 of a motor vehicle 4, wherein the drive 2 has an electric drive motor 8, a drive housing 13 and a cable grommet 1, wherein the cable grommet 1 has a vehicle-body-side cable grommet connection 16, a drive-side cable grommet connection 17 and a protective hose 18 extending from the vehicle-body-side cable grommet connection 16 to the drive-side cable grommet connection 17 along a geometric center line M, wherein a guide channel 19 extends for passing at least one electric line 20 through the vehicle-body-side cable grommet connection 16, the drive-side cable grommet connection 17 and the protective hose 18.It is now essential that the drive-side cable bushing connection 17 is designed in multiple parts with an axial protective hose section 21 and a clamping sleeve 22 axially secured to the drive housing 13. It is furthermore essential that the protective tube section 21 is introduced from the outside, i.e. from the side which forms the environment of the drive 2 or drive housing 13 in the assembled state of the drive 2, into a housing clamping section 24 formed by a housing recess 23 of the drive housing 13, and the clamping sleeve 22 is introduced into the housing clamping section 24 from the inside, i.e. from the other side, in particular can also be introduced only from the inside due to its shape. This is done in such a way that protective tube section 21 and clamping sleeve 22 overlap axially in housing clamping section 24. Finally, it is also essential that the protective tube 18 has a tube wall 25 and the tube wall 25 is radially clamped between clamping sleeve 22 and housing clamping section 24 or between two sections of the clamping sleeve 22 in the region of the protective tube section 21.The drive-side cable bushing connection 17 is at least two-part, i.e. is composed of at least two separately produced parts, namely here and preferably the protective tube section 21 on the one hand and the clamping sleeve 22 on the other hand.A clamping sleeve 22 is here quite generally understood to mean a component with a structure (a material body) which, on the one hand, surrounds a space section at least partially, preferably completely, and thereby forms a passage for the electrical lines 20 in the axial direction, and which, on the other hand, provides a material section which, in the assembled state, can press against the tube wall 25 in the radial direction, i.e. orthogonally to the axial direction, and can generate said contact pressure force or clamping force. A clamping sleeve 22 preferably has a tubular structure and, in particular, a round cross section. The tubular structure then completely surrounds said space section through which the electrical lines 20 are guided and at the same time also enables the clamping function in question.The clamping sleeve 22 is axially secured with respect to the drive housing 13 so that the protective tube section 21, which is radially clamped in the assembled state, is securely held, even if it is only radially clamped between the sections of the clamping sleeve 22. "Axially secured" means secured to or relative to the drive housing 13 in a captive, preferably fixed (immovable) manner.The housing clamping portion 24 is formed by a housing recess 23 of the drive housing 13, that is, the housing clamping portion 24 is an axial portion of the inner wall 26 of the housing recess 23.When a "section" of the clamping sleeve 22 is mentioned here and below, a part of the clamping sleeve 22 configured otherwise in one piece with the clamping sleeve 22 is always meant, that is to say the clamping sleeve 22 is manufactured in one piece.The directional specifications "axial" and "radial" are always referred to here with respect to the direction in which the geometric center line M of the protective tube 18 extends and in which the protective tube section 21 is correspondingly joined to the clamping sleeve 22 during the assembly.As FIGS. 3 and 4 show, here and preferably the clamping sleeve 22 has a tubular, in particular substantially cylindrical, sleeve main body 27. Furthermore, here and preferably the clamping sleeve 22 has a sleeve collar 28 which extends radially outwards from the sleeve main body 27, in particular at the axial end side."Tubular" here comprises any cross-sectional shape, in particular a round cross-section."Substantially cylindrical" in this context means that the inside and outside of the clamping sleeve 22 are at least largely congruent with an imaginary cylinder, wherein, however, deviations from the cylindrical shape are also permissible in sections, for example in the region of a holding section 29 described below, or here also by the optional sleeve collar 28.A "sleeve collar" 28 is here a radial widening, that is to say a collar-shaped section which forms an axial stop for bearing against an inner-side housing shoulder 30 of the drive housing 13.By "axially at the end" is meant an arrangement of the sleeve collar 28 at an axial end of the clamping sleeve 22, which in the assembled state lies outside the protective tube 18.As already indicated above, the clamping sleeve 22 here and preferably, as the exemplary embodiments show in FIGS. 3 and 4, has a holding section 29 which, in the assembled state, protrudes radially toward the protective tube 18 at least at one point. Such a protruding point or such protruding points is or are provided here in order to exert a maximum pressing force on the protective tube 18 at the contact point or points between the holding section 29 and the protective tube section 21. "Maximum" means that the pressing force exerted by the clamping sleeve 22 on the protective tube 18 is the highest here, thus producing the relevant part of the holding effect here."Protruding" means here that the clamping sleeve 22 has a greater radial extent at this location or at these locations than in the regions adjacent thereto, in particular axially adjacent thereto.Such a holding section 29 can be provided in different regions of the clamping sleeve 22. According to FIG. 3 and according to FIG. 4 a), here and preferably the holding section 29 is provided on the sleeve main body 27. In this case, the holding section 29, as in FIG. 3, can be formed by a single, in particular partially or completely encircling, cross-sectional widening 31 of the outer cross section of the sleeve main body 27, or, as in FIG. 4 a), by a plurality of axially spaced apart, in particular partially or completely encircling, cross-sectional widenings 31 of the outer cross section of the sleeve main body 27, in particular a saw-tooth profile 32.Such a cross-sectional widening 31 or such cross-sectional widenings 31 is or are provided here in order to exert the aforementioned maximum contact force on the protective tube 18 at the respective contact point between the cross-sectional widening 31 and the protective tube section 21. A saw tooth profile 32 has the additional effect that the cross-sectional widenings 31 can dig into the material of the protective tube section 21 and thus also a form fit is produced.In principle, as illustrated in FIG. 4 b), the holding section 29 can also be formed by at least one spring element 33 which extends radially at a distance from the clamping sleeve 22, in particular from the sleeve main body 27. In this case, the at least one spring element 33 can each have at least one, in particular hook-shaped, projection 34 directed toward the sleeve main body 27 and / or, in the assembled state, toward the protective tube 18. Such a projection 34 is provided here in order to exert the aforementioned maximum contact force on the protective tube 18 at the respective contact point between the projection 34 and the protective tube section 21.In this context, a spring element 33 is a part of the clamping sleeve 22 that can be deflected elastically with respect to the clamping sleeve 22, in particular with respect to the sleeve main body 27, and preferably extends substantially parallel to the clamping sleeve 22, in addition, in particular with respect to the sleeve main body 27. Here and preferably, a plurality of such spring elements 33 are arranged over the circumference, which each have a hook-shaped projection 34 here.In principle, the combination of at least one such spring element 33 as a holding section 29 with at least one above cross-sectional widening 31 as a further holding section 29 is also conceivable.Furthermore, it is provided here and preferably that the clamping sleeve 22, in particular the sleeve main body 27, has a cross-sectional constriction 35 of the outer cross section of the clamping sleeve 22 adjacent to the holding section 29, in particular adjacent to the housing interior in the assembled state, preferably between the holding section 29 and the sleeve collar 28. This is illustrated by way of example in FIG. 3.In the region of such a cross-sectional constriction 35 of the clamping sleeve 22, the cross-section of the hose wall 25 of the protective hose 18 abutting the clamping sleeve 22 is widened compared to the region of the at least one cross-sectional widening, i.e. the hose wall 25 is thicker here and / or the inner cross-section of the protective hose section 21 is narrower here. In this way, it is further difficult to remove the protective tube 18.In the exemplary embodiments illustrated here and thus preferred, it is furthermore the case that the clamping sleeve 22, in particular the sleeve main body 27, has an insertion section 36 formed by an end-side tapering of the clamping sleeve 22, in particular of the sleeve main body 27. Here and preferably, the insertion section 36 is arranged at the axial end of the clamping sleeve 22 arranged in the protective tube 18 in the assembled state and / or facing away from the sleeve collar 28.Such an insertion section 36 facilitates insertion into the protective tube 18 by the tapering of the clamping sleeve 22 at this end.Furthermore, it is provided here and preferably for a clamping effect that is as optimal as possible that the clamping sleeve 22 extends in the axial direction at least over the major part of the housing clamping section 24, preferably at least as far as the outer edge of the housing recess 23. Particularly preferably, the clamping sleeve 22 in the present case even extends beyond the outer edge of the housing recess 23, as shown in FIGS. 3 and 4, protrudes axially outwards from the housing clamping section 24.The axial securing of the clamping sleeve 22 can be effected in different ways. Thus, it can be provided in principle that the clamping sleeve 22 is axially secured with respect to the drive housing 13 exclusively by frictional engagement, in particular exclusively by frictional engagement between the clamping sleeve 22 and the protective tube section 21. It is also conceivable for the clamping sleeve 22 to be axially secured to the drive housing 13 in a frictional and / or positive-locking and / or materially integral manner. Here and preferably, the clamping sleeve 22 is axially secured to the drive housing 13 in a frictional, positive-locking and firmly bonded manner.Such a positive connection is effected here in particular by axial contact of the sleeve collar 28 on the drive housing 13, preferably on the inside housing shoulder 30. The material bond has the additional advantage that the tightness can be further increased, which additionally makes it more difficult for moisture to penetrate into the interior of the drive 2 or drive housing 13.Furthermore, in the exemplary embodiments illustrated here and to this extent preferred, it is provided that the drive housing 13 has a housing cover 37 and that the housing cutout 23 of the drive housing 13 is provided in the housing cover 37.As FIGS. 3, 4 a) and 4 b) show, it is provided here and preferably additionally that the housing clamping section 24, here for the frictional radial contact of the protective tube 18, has a first housing axial section 38 with constant cross section, in particular diameter (FIGS. 3 and 4 a) ) and / or, here for bending the spring elements 33 radially inward, has a second housing axial section 39 with a cross section decreasing toward the housing outer side, in particular diameter (FIG. 4 b)).Here and preferably, it is such that the protective tube 18 is designed at least in sections and / or the entire protective tube section 21 is designed in the manner of a corrugated tube.In the manner of a "corrugated hose" means that the radially outer hose cross section alternately increases and decreases, namely with the same or alternating wall thickness.A protective tube section shaped in this way is particularly suitable for clamping in question.According to a further teaching, a cable grommet 1 for an electromotive drive 2, in particular a spindle drive, for adjusting a closure element 3 of a motor vehicle 4, is proposed, wherein the cable grommet 1 has a vehicle-body-side cable grommet connection 16, a drive-side cable grommet connection 17 and a protective hose 18 extending from the vehicle-body-side cable grommet connection 16 to the drive-side cable grommet connection 17 along a geometric center line M, wherein a guide channel 19 extends for passing at least one electrical line 20 through the vehicle-body-side cable grommet connection 16, the drive-side cable grommet connection 17 and the protective hose 18.It is essential according to this further teaching that the drive-side cable bushing connection 17 is designed in multiple parts with an axial protective hose section 21 and a clamping sleeve 22 axially secured to the drive housing 13. It is also essential that the protective tube section 21 can be introduced from the outside into a housing clamping section 24 formed by a housing recess 23 of the drive housing 13, and the clamping sleeve 22 can be introduced from the inside into the housing clamping section 24, so that the protective tube section 21 and clamping sleeve 22 axially overlap in the housing clamping section 24. Finally, it is also essential that the protective tube 18 has a tube wall 25 and the tube wall 25 can be radially clamped between clamping sleeve 22 and housing clamping section 24 or between two sections of the clamping sleeve 22 in the region of the protective tube section 21.That is, the collet 22 has a shape that causes, when the protective tube portion 21 is inserted from the outside and the collet 22 is inserted into the housing clamping portion 24 from the inside and axially overlap each other, the tube wall 25 in the region of the protective tube portion 21 to be radially clamped either between the collet 22 and the housing clamping portion 24 or between the two portions of the collet 22. Here and preferably, in the former case, in order to effect the clamping, the radial outer side of the clamping sleeve 22, in particular of the sleeve main body 27, has a cross-sectional widening 31, by means of which the clamping sleeve 22, in particular the sleeve main body 27, and the housing clamping section 24 are prestressed against one another as soon as the hose wall 25 of the protective hose section 21 is introduced between them. Thus, the shape of the clamping sleeve 22 creates a constriction between the clamping sleeve 22 and the housing clamping section 24, which produces the clamping of the hose wall 25. In the latter case, here and preferably in order to effect the clamping, the two sections of the clamping sleeve 22 are shaped such that they are prestressed against one another as soon as the hose wall 25 of the protective hose section 21 is inserted between them.Reference may be made to all explanations concerning the proposed drive 2.References included in the specificationThis list of documents cited by the applicant has been produced in an automated manner and is only included for the better information of the reader. The list is not part of the German patent application or utility model application. The DPMA does not take any adhesion for any faults or omissions.Patent Literature citedDE 10 2020 131 723 A1

[0004]

Claims

Drive, in particular spindle drive, for adjusting a closure element (3) of a motor vehicle (4), wherein the drive (2) has an electric drive motor (8), a drive housing (13) and a cable bushing (1), wherein the cable bushing (1) has a vehicle-body-side cable bushing connection (16), a drive-side cable bushing connection (17) and a protective hose (18) extending from the vehicle-body-side cable bushing connection (16) to the drive-side cable bushing connection (17) along a geometric centre line (M), wherein a guide channel (19) extends for passing at least one electric line (20) through the vehicle-body-side cable bushing connection (16), the drive-side cable bushing connection (17) and the protective hose (18), characterized in that, the drive-side cable grommet connection (17) is designed in multiple parts with an axial protective tube section (21) and a clamping sleeve (22) axially secured to the drive housing (13), the protective tube section (21) is introduced from the outside into a housing clamping section (24) formed by a housing recess (23) of the drive housing (13) and the clamping sleeve (22) is introduced from the inside into the housing clamping section (24), so that the protective tube section (21) and clamping sleeve (22) axially overlap in the housing clamping section (24), and the protective tube (18) has a tube wall (25) and the tube wall (25) is radially clamped between clamping sleeve (22) and housing clamping section (24) or between two sections of the clamping sleeve (22) in the region of the protective tube section (21).Drive according to Claim 1, characterized in that the clamping sleeve (22) has a tubular, in particular substantially cylindrical, sleeve main body (27), preferably in that the clamping sleeve (22) has a sleeve collar (28) which extends radially outwards from the sleeve main body (27), in particular at the axial end side.Drive according to Claim 1 or 2, characterized in that the clamping sleeve (22) has a retaining section (29) which, in the assembled state, protrudes radially towards the protective tube (18) at least at one point.Drive according to Claim 3, characterized in that the holding section (29) is provided on the sleeve main body (27), preferably in that the holding section (29) is formed by a single, in particular partially or completely encircling, cross-sectional widening (31) of the outer cross section of the sleeve main body (27), or in that the holding section (29) is formed by a plurality of axially spaced-apart, in particular partially or completely encircling, cross-sectional widenings (31) of the outer cross section of the sleeve main body (27), in particular a saw-tooth profile (32).Drive according to Claim 3 or 4, characterized in that the retaining section (29) is formed by at least one spring element (33) which extends radially at a distance from the clamping sleeve (22) otherwise, in particular towards the sleeve main body (27), preferably in that the at least one spring element (33) has in each case at least one, in particular hook-shaped, projection (34) which is directed towards the sleeve main body (27) and / or, in the assembled state, towards the protective tube (18).Drive according to one of Claims 3 to 5, characterized in that the clamping sleeve (22), in particular the sleeve main body (27), has a cross-sectional constriction (35) of the outer cross section of the clamping sleeve (22) adjacent to the holding section (29), in particular adjacent to the housing interior in the assembled state, preferably between the holding section (29) and the sleeve collar (28).Drive according to one of the preceding claims, characterized in that the clamping sleeve (22), in particular the sleeve main body (27), has an insertion section (36) formed by an end-side tapering of the clamping sleeve (22), in particular of the sleeve main body (27), preferably in that the insertion section (36) is arranged at the axial end of the clamping sleeve (22) which is arranged in the protective tube (18) in the mounted state and / or is remote from the sleeve collar (28).Drive according to one of the preceding claims, characterized in that the clamping sleeve (22) extends in the axial direction at least over the major part of the housing clamping section (24), preferably at least as far as the outer edge of the housing recess (23), further preferably beyond the outer edge of the housing recess (23).Drive according to one of the preceding claims, characterized in that the clamping sleeve (22) is axially secured to the drive housing (13) exclusively in a frictional manner, in particular exclusively by means of a frictional connection between the clamping sleeve (22) and the protective tube section (21), or in that the clamping sleeve (22) is axially secured to the drive housing (13) in a frictional and / or positive-locking and / or firmly bonded manner.Drive according to one of the preceding claims, characterized in that the drive housing (13) has a housing cover (37) and in that the housing cutout (23) of the drive housing (13) is provided in the housing cover (37).Drive according to one of the preceding claims, characterized in that the housing clamping section (24) has a first housing axial section (38) with a constant cross section, in particular diameter, and / or a second housing axial section (39) with a cross section, in particular diameter, which decreases towards the housing outer side.Drive according to one of the preceding claims, characterized in that the protective tube (18) is designed at least in sections and / or the entire protective tube section (21) is designed in the manner of a corrugated tube.Cable grommet for an electric motor drive (2), in particular a spindle drive, for adjusting a closure element (3) of a motor vehicle (4), wherein the cable grommet (1) has a vehicle-body-side cable grommet connection (16), a drive-side cable grommet connection (17) and a protective sleeve (18) extending from the vehicle-body-side cable grommet connection (16) to the drive-side cable grommet connection (17) along a geometric centre line (M), wherein a guide channel (19) for passing at least one electrical line (20) extends through the vehicle-body-side cable grommet connection (16), the drive-side cable grommet connection (17) and the protective sleeve (18), characterized in that the drive-side cable grommet connection (17) is configured in multiple parts with an axial protective sleeve section (21) and a clamping sleeve (22) axially secured to the drive housing (13), the protective tube section (21) can be introduced from the outside into a housing clamping section (24) formed by a housing recess (23) of the drive housing (13) and the clamping sleeve (22) can be introduced from the inside into the housing clamping section (24), so that the protective tube section (21) and the clamping sleeve (22) axially overlap in the housing clamping section (24), and the protective tube (18) has a tube wall (25) and the tube wall (25) can be radially clamped in the region of the protective tube section (21) between the clamping sleeve (22) and the housing clamping section (24) or between two sections of the clamping sleeve (22).

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