DE102019101065A1 - Spindle drive for an adjusting element of a motor vehicle - Google Patents

Abstract

The invention relates to a spindle drive for an adjusting element (2) of a motor vehicle, a tubular drive housing (5) having a housing inner tube (5a) and a housing outer tube (5b), which is moved between an extended position and a retracted position when the spindle drive (1) is adjusted Position telescoping into one another is provided, wherein in the drive housing (5) a spindle-spindle nut gear (7) with a spindle (8) and a spindle nut (9) in meshing engagement therewith for generating linear drive movements along the geometric spindle axis (4) the spindle (8) is provided, with a first drive connection (10) and a second drive connection (11) being provided for guiding out the drive movements, a sealing cap (15) being provided, which seals the drive housing (5) in the region of the first drive connection ( 10) closes and that of a drive train component (13) of the spindle drive (1), the first Drive connection (10) is penetrated, the sealing cap (15) being axially fixed to the housing inner tube (5a), an annular space (16) being formed between the radial outside of the housing inner tube (5a) and the radial inside of the sealing cap (15) into which the outer housing tube (5b) is axially immersed when the spindle drive (1) is adjusted from the extended position to the retracted position. It is proposed that the sealing cap (15) have at least one drain recess (17, 18, 19) that is radially spaced and / or offset from the geometric spindle axis (4).

Description

The invention relates to a spindle drive for an adjusting element of a motor vehicle according to the preamble of claim 1.

The spindle drive in question can be used for all types of adjusting elements of a motor vehicle. Exemplary adjustment elements are tailgates, trunk lids, side doors, bonnets or the like.

Particularly when the spindle drive is used in the wet area, for example in an area located to the side of a tailgate opening, there are particularly high demands on the spindle drive with regard to preventing moisture from entering the drive housing.

The well-known spindle drive ( DE 10 2016 120 178 A1 ), from which the invention is based, shows a tubular, two-part drive housing with two housing sections in the form of a housing inner tube and a telescopic housing outer tube running therein. The drive housing is closed in the area of a drive connection by a housing cover which is penetrated by a drive train component of the spindle drive, which comprises an assigned drive connection. As an additional sealing measure, a sealing cap is provided which is placed on the drive housing in the area of this drive connection and which is likewise penetrated by the drive train component.

While the known spindle drive generally provides a good seal of the drive housing, a certain position of the spindle drive can result in moisture between the sealing cap and the drive housing via a gap between the radial outside of the housing inner tube and the radial inside of the sealing cap into the interior of the sealing cap arrives in an annular space between the inner tube and sealing cap. If the spindle drive is then adjusted to its retracted position, the outer housing tube moves telescopically along the inner housing tube and dips into the annular space between the inner housing tube and the sealing cap, as a result of which the moisture in this annular space cannot escape. Under certain circumstances, the liquid in this annular space is compressed so much when the outer housing tube is immersed that a part gets between the inner tube and the outer tube. It is therefore a challenge to keep the area between the inner tube and sealing cap as free from moisture as possible, in order to: to avoid in the cold that the moisture freezes and this can lead to a system failure or damage to the drive.

The invention is based on the problem of designing and developing the known spindle drive in such a way that the sealing of the drive housing is improved.

The above problem is solved in a spindle drive according to the preamble of claim 1 by the features of the characterizing part of claim 1.

The fundamental consideration is to design the sealing cap in such a way that any moisture or liquid that accumulates in it can run off as optimally as possible. The drainage of accumulated liquid is improved at least for a position of the spindle drive in which the housing outer tube is not yet or at least not completely immersed in the sealing cap when the spindle drive is adjusted in the direction of its retracted position. However, it is particularly preferably possible to run off even when the housing outer tube is in its end position in the retracted position of the spindle drive. The drainage of liquid is, as proposed, achieved by drainage cutouts. A drainage recess is generally a recess in the sealing cap through which liquid can flow outwards from the inside of the sealing cap. In this case, such a recess can be a recess on the edge or an axial recess on the edge, that is to say a recess that is not completely enclosed by the material of the sealing cap. However, a recess can also be formed by an opening or a hole, that is to say by a recess which is completely surrounded by the material of the sealing cap.

Specifically, it is proposed that the sealing cap have at least one drain recess radially spaced and / or offset from the geometric spindle axis. In particular, the respective drain recess is radially spaced and / or offset from a drive connection opening which is coaxial with the geometric spindle axis and through which the drive train component, which axially penetrates the sealing cap, is passed from the inside of the cap to the outside.

In the particularly preferred embodiment according to claim 2, at least one drain recess is an edge recess on the axial edge of the sealing cap facing the second drive connection. The sealing cap has in particular a cover section and a sleeve section, the axial edge of the sealing cap then being the axial edge of the sealing cap facing away from the cover section. Additionally or alternatively, at least one drain recess is provided, which is designed as an opening in the sealing cap, that is to say as a hole completely surrounded by material.

According to the further preferred embodiment according to claim 3, a plurality of drainage cutouts can also be arranged in the circumferential direction, in particular at uniform angular intervals over the circumference, in order to cover all positions / outlet directions in the case of a variable installation position.

Claims 4 to 7 define preferred configurations in which at least one drainage recess is designed as an edge-side recess. One or more such drain recesses on the edge form an uneven course of the end of the sealing cap facing the second drive connection. In particular, a circumferential, crown-like contour can be created here, that is to say a contour which is distinguished by projecting and recessed sections which alternate in each case. Such an uneven contour has the advantage that liquid can adhere less well to the radial inside of the sealing cap when the axial edge of the sealing cap facing the second drive connection points at least essentially in the direction of gravity than in the case of a uniform circumferential axial edge of the sealing cap. An uneven contour reduces the adhesive force, which means that water cannot flow off a surface in the direction of gravity.

Claim 8 defines a particularly preferred construction of the sealing cap with a sleeve section and a cover section. The cover section faces the first drive connection and the sleeve section extends axially from the cover section in the direction of the second drive connection. The cover section preferably has a drive connection opening which is coaxial with the geometric spindle axis and through which the drive train component, which comprises the first drive connection, is guided. The one or more drain recesses provided according to the proposal are then preferably radially spaced from the drive connection opening.

Claims 9 to 12 relate to preferred configurations in which at least one drain recess is formed by an opening in the sealing cap. At least one opening in the sleeve section and / or at least one opening in the cover section can be provided. The at least one opening forming an outlet recess opens particularly preferably into an outlet channel which is formed by a sealing cap projection. A sealing cap projection is a projection which, in addition, protrudes radially or axially with respect to the sealing cap. To this extent, it can be a radial sealing cap projection or an axial sealing cap projection. The sealing cap projection is shaped in such a way that it connects the respective opening forming a drainage recess in the cover section or in the sleeve section with the surroundings. The respective outlet channel extends from the corresponding opening in the cover section or sleeve section to a corresponding channel outlet. In principle, however, it is also conceivable to provide only the respective opening forming a drain recess, in particular in the sleeve section, and to dispense with an additional sealing cap projection with a drain channel. The opening then particularly preferably has an opening wall with two mutually opposite wall sections which, in a cross section along a plane in which the spindle axis lies, run at an angle to the spindle axis and in this respect form an oblique channel within the wall forming the sleeve section. This channel particularly preferably has a course starting from the radial inside to the radial outside of the sleeve section, which has a directional component from the first drive connection in the direction of the second drive connection. The radially inside channel entrance is thus axially closer to the cover section than the radially outside channel exit.

In the further preferred embodiment according to claim 13, a drive motor is provided in the drive housing, to which the spindle-spindle nut transmission is connected in terms of drive technology. In principle, the spindle drive can also be designed without a motor.

Claim 14 defines a particularly preferred embodiment in which a guide tube is connected axially fixed to the first drive connection and, together with the first drive connection, forms said drive train component which penetrates the sealing cap. The drive train component is axially fixed to the spindle nut. Accordingly, the sealing cap provided according to the proposal is a sealing cap provided on the spindle nut side or on the output side. In principle, however, the case is also conceivable in which the sealing cap forms a spindle-side or drive-side sealing cap. In this case, the spindle or the drive motor is axially fixed to the first drive connection and, together with the first drive connection, forms said drive train component.

In the further preferred embodiment according to claim 15, a seal of the drive housing is provided in the area of the first drive connection. The seal can be achieved via an at least sectionally elastic sealing cap, which rests sealingly on the drive train component.

• 1 den Heckbereich eines Kraftfahrzeugs mit einem vorschlagsgemäßen Spindelantrieb,
• 2 ein erstes Ausführungsbeispiel des vorschlagsgemäßen Spindelantriebs mit im Bereich des ersten Antriebsanschlusses vorgesehener Dichtkappe a) in einer nahezu ausgefahrenen Stellung, b) in einer Zwischenstellung und c) in einer nahezu eingefahrenen Stellung,
• 3 ein weiteres Ausführungsbeispiel eines vorschlagsgemäßen Spindelantriebs mit einer im Bereich des ersten Antriebsanschlusses vorgesehenen Dichtkappe a) in einer Perspektivansicht in einer nahezu ausgefahrenen Stellung des Spindelantriebs, b) in einer Schnittansicht in der nahezu ausgefahrenen Stellung des Spindelantriebs und c) in einer Schnittansicht in einer nahezu eingefahrenen Stellung des Spindelantriebs und
• 4 noch ein weiteres Ausführungsbeispiel eines vorschlagsgemäßen Spindelantriebs mit einer im Bereich des ersten Antriebsanschlusses vorgesehenen Dichtkappe a) in einer Perspektivansicht in einer nahezu ausgefahrenen Stellung des Spindelantriebs, b) in einer Schnittansicht in der nahezu ausgefahrenen Stellung des Spindelantriebs und c) in einer Schnittansicht in einer nahezu eingefahrenen Stellung des Spindelantriebs.

The invention is explained in more detail below on the basis of a drawing which merely shows exemplary embodiments. In the drawing shows

• 1 the rear area of a motor vehicle with a proposed spindle drive,
• 2nd a first embodiment of the proposed spindle drive with a sealing cap provided in the area of the first drive connection a) in an almost extended position, b) in an intermediate position and c) in an almost retracted position,
• 3rd a further embodiment of a proposed spindle drive with a sealing cap provided in the area of the first drive connection a) in a perspective view in an almost extended position of the spindle drive, b) in a sectional view in the almost extended position of the spindle drive and c) in a sectional view in an almost retracted position Position of the spindle drive and
• 4th yet another embodiment of a proposed spindle drive with a sealing cap provided in the area of the first drive connection a) in a perspective view in an almost extended position of the spindle drive, b) in a sectional view in the almost extended position of the spindle drive and c) in a sectional view in an almost retracted position of the spindle drive.

The spindle drive shown in the drawing 1 is an adjustment element 2nd assigned to a motor vehicle, which is here and preferably a tailgate 3rd acts. All versions of a tailgate 3rd apply to all other types of adjustment elements 2nd a motor vehicle. In this respect, reference may be made to the exemplary list in the introductory part of the description.

The spindle drive 1 is used for motorized adjustment of the tailgate 3rd . The spindle drive is for this 1 on the vehicle body on the one hand and on the tailgate 3rd on the other hand, each spaced from a pivot axis 3a the tailgate 3rd , articulated. The spindle drive 1 generates linear drive movements along the geometric spindle axis 4th so that the tailgate 3rd between a closed position and the in 1 motor position shown can be adjusted.

1 shows that the spindle drive 1 a tubular drive housing 5 with two housing sections 5a , 5b having. Here and preferably there are a housing inner tube as housing sections 5a and a housing outer tube 5b provided when adjusting the spindle drive 1 run telescopically between an extended position and a retracted position.

Here and preferably are in the drive housing 5 along the spindle axis 4th a drive motor in a row 6 and the drive motor 6 downstream spindle-spindle nut gear 7 intended. Between the drive motor 6 and the spindle-spindle nut gear 7 if necessary, an intermediate gear can be provided. The drive motor 6 drives the spindle 8th of the spindle-spindle nut gear 7 so that the spindle nut 9 of the spindle-spindle nut gear 7 that are non-rotatable but axially movable in the spindle drive 1 is mounted, performs an axial movement.

A first drive connection is used to derive the drive movements 10th and a second drive connection 11 provided here and preferably on the spindle axis 4th are arranged.

A guide tube 12th is with the first drive connection 10th connected and forms together with the first drive connection 10th a combined powertrain component 13 out. Here and preferably is the drive connection 10th with a ball socket and with an extension adjoining the ball socket 10b fitted. The first drive connection can be used instead of the ball socket 10th also be designed with a ball head or another connection element. The process 10b is with the guide tube 12th axially and non-rotatably connected. At its the first drive connection 10th opposite end is the guide tube 12th with the spindle nut 9 of the spindle-spindle nut gear 7 axially fixed and non-rotatably connected, so that the axial movements of the spindle nut 9 over the guide tube 12th to the first drive connection 10th to get redirected.

The second drive connection 11 is on the motor side of the spindle drive 1 arranged so that a motorized adjustment of the spindle nut 9 an adjustment of the drive connections 10th , 11 against each other along the spindle axis 4th generated.

The figures also show that the spindle drive 1 also a case cover 14 can have the drive housing 5 in the area of the first drive connection 10th closes and that of the drive train component 13 is permeated.

Next is a sealing cap 15 provided the drive housing 5 in the area of the first drive connection 10th closes and that of the powertrain component 13 of the spindle drive 1 that the first drive connection 10th includes, is permeated. The sealing cap 15 is with the inner tube 5a axially connected, being between the radial outside of the housing inner tube 5a and the radial inside of the sealing cap 15 an annulus 16 is formed, in which the housing outer tube 5b when adjusting the spindle drive 1 axially immersed from the extended position to the retracted position.

For the sake of completeness, it should be noted that here the guide tube 12th with the first drive connection 10th is axially fixed and together with the first drive connection 10th the powertrain component 13 that the sealing cap 15 penetrates, trains, the powertrain component 13 with the spindle nut 9 of the spindle-spindle nut gear 7 is axially connected. Alternatively, it can also be provided in an embodiment not shown here that the spindle 8th or the drive motor 6 with the first drive connection 10th is axially fixed and together with the first drive connection 10th the powertrain component 13 that the sealing cap 15 penetrates, trains.

Up to this point, the structure of the proposed spindle drive corresponds 1 the structure of the in the DE 10 2016 120 178 A1 shown spindle drive, which goes back to the applicant and the content of which is made the subject of the present application.

It is now essential for the proposed solution that the sealing cap 15 at least one to the geometric spindle axis 4th radially spaced and / or offset drain recess 17th , 18th , 19th having. A drainage cutout is generally a cutout in the sealing cap 15 accumulated moisture or liquid can flow out of the inside of the cap. In this way, moisture inside the cap is minimized compared to a completely closed sealing cap. This prevents the spindle drive from retracting accordingly 1 from its extended position to its retracted position, liquid between the housing inner tube 5a and the housing outer tube 5b reached. There is also a risk of freezing in the case of freezing temperatures in the retracted position of the spindle drive 1 minimized.

The 2nd on the one hand and the 3rd and 4th on the other hand, they differ in the design of the drain recess 17th , 18th , 19th . In case of 2nd are several cutouts on the edge 17th on the second drive connection 11 facing axial edge 15a the sealing cap 15 intended. The 3rd and 4th on the other hand show an embodiment in which several drain recesses 18th , 19th in the form of an opening, i.e. a hole, in the sealing cap 15 are provided. In principle, only one such drain recess can be used 17th , 18th , 19th be provided or there may be several such drain recesses 17th , 18th , 19th be provided. In principle, one or more cutouts on the edge can also be made 17th with one or more openings forming a drain recess 18th , 19th be combined. Are several drainage cutouts 17th , 18th , 19th provided, these are in particular in the circumferential direction around the geometric spindle axis 4th distributed, in particular evenly distributed, arranged.

In the following, the embodiment according to FIG 2nd To be received. Here are a variety of marginal cutouts 17th provided, which are arranged at regular angular intervals in the circumferential direction. The respective recess on the edge 17th has two recess side edges 17a on, each with the axial edge 15a forming axially outer edge of the sealing cap 15 each in a corner 20 , here an outside corner, meet. Additionally or alternatively, it can also be provided that the respective drain recess 17th a corner 20 has in the form of an inner corner, which is formed at a point at which a recess base edge 17b , i.e. the deepest edge of the drain recess 17th , with the respective recess side edge 17a meets. By here and preferably corners 20 and just no rounding is provided, the adhesive force, the liquid on the inside of the sealing cap 15 holds, noticeably reduced. Liquid can be like this 2 B) shows, particularly easy to drain when the spindle drive 1 is moved in the direction of its retracted position and the sealing cap is arranged so that you the second drive connection 11 facing axial edge 15a points at least partially in the direction of gravity.

The cutouts on the edge 17th have the additional advantage that at the beginning of the immersion of the housing outer tube 5b in the annulus 16 Liquid first from the annulus 16 through the recesses 17th is pushed out before the recesses 17th from the housing outer tube 5b be covered or closed on the inside.

The recess side edges 17a run here and preferably parallel to the geometric spindle axis 4th . The recess base edge 17b runs here in one to the geometrical spindle axis 4th orthogonal plane. A circumferential, crown-like contour with essentially rectangular projections and depressions is thereby formed. But there are also other configurations of the radial recesses 17th conceivable, for example those in which the two recess side edges 17a a recess 17th meet immediately and form an inner corner between them, in this case no recess base edge is provided. In addition or as an alternative, there are also configurations of the radial cutouts 17th conceivable where a recess side edge 17a a recess 17th and a recess side edge 17a the adjacent recess 17th meet immediately and form an outside corner.

An as irregular as possible contour, preferably with corners, is therefore preferred 20 , in the area of the axial edge 15a the sealing cap 15 created, which facilitates the drainage of liquid due to reduced adhesive forces.

Here and preferably is the outer casing tube 5b when the spindle drive is retracted 1 with the recess on the edge 17th in at least partial, here complete, radial overlap.

Here and preferably it is further provided that the axial edge 21 of the housing outer tube 5b , the first drive connection 10th is facing a circumferential bevel 21a has, which is here and preferably directed radially outwards. Such a bevel 21a improves the displacement of liquid radially outwards at the beginning of the immersion of the housing outer tube 5b in the annulus 16 .

The following is now based on 3rd another embodiment explained. Here and preferably one or more are a drain recess 18th forming openings, i.e. from the material of the sealing cap 15 Surrounded holes in the sealing cap 15 provided, namely in a sleeve section 15b and / or in a cover section 15c the sealing cap 15 . According to the representation 3rd is just one such opening 18th shown, but such an opening at one or more other locations 18th can be provided.

As in 3b) is recognizable, the cover section 15c here and preferably one to the geometric spindle axis 4th coaxial drive connection opening 22 through which the powertrain component 13 that the sealing cap 15 axially penetrates axially. For sealing between the drive connection opening 22 and the powertrain component passed through it 13 is the sealing cap 15 here, and preferably at least in sections, is elastic and lies sealingly on the drive train component 13 on.

The at least one, here exactly one, drain opening or opening 18th is here and preferably from the drive port opening 22 radially spaced. The only drain recess or opening here 18th is, as shown here, particularly preferably in an extended and / or retracted position of the spindle drive 1 in the direction of gravity or towards the bottom of the spindle drive 1 arranged, which has the advantage that no rainwater through this opening 18th from the outside into the sealing cap 15 can penetrate.

In the embodiment according to 3rd it is further provided that the at least one opening 18th into a drain channel 23 opens out from a radial sealing cap projection 24th , ie one in the radial direction with respect to the sleeve section 15b projecting section of the sealing cap 15 , is formed. The drain channel 23 extends outside of the sleeve section 15b forming sealing cap wall. The sealing cap projection 24th is here and preferably on the sleeve section 15b arranged. The drain channel 23 runs here and preferably at least in sections, in particular in an end section, axially in the direction of the second drive connection to a channel outlet, in particular to an axial channel outlet.

How 3b illustrates, with the spindle drive in its extended position 1 into the sealing cap 15 liquid immediately coming out of this via the drain channel 23 flow out and does not accumulate there, at least not to a significant degree.

It is further here and preferably so that the annulus 16 from the second drive connection 11 facing side of the sealing cap 15 to the lid section 15c enough and sticking to the opening 18th extends axially past. Now dives when adjusting the spindle drive 1 the housing outer tube in its retracted position 5b in the annulus 16 any liquid from the housing outer tube 5b axially in the direction of the cover section 15c displaced, causing the liquid to enter the area of the opening 18th arrives and there via the drain channel 23 from the sealing cap 15 can flow out.

Additionally or alternatively, what is not shown here can also have at least one drain recess 18th forming opening open into a drainage channel, which by an axial sealing cap projection, that is one in the axial direction with respect to the cover portion 15c projecting section of the sealing cap 15 , is formed. This sealing cap projection can thus on the cover section 15c be arranged and protrude axially, in particular axially outwards, with respect to this, the outlet channel then preferably running at least in sections, in particular in an end section, radially outwards to a channel outlet, in particular to a radial channel outlet.

A further exemplary embodiment is described below with the aid of 4th explained. Here and preferably are like at 3rd one or more a drainage recess 19th forming openings, i.e. from the material of the sealing cap 15 surrounded holes in the in a sleeve section 15b and / or in a cover section 15c the sealing cap 15 intended. Here are an example of several such openings 19th provided, but again only a single such opening 19th can be provided.

Here and preferably the at least one opening 19th one of the material of the sleeve portion 15b formed opening wall. In this embodiment, there is preferably no sealing cap projection with an outside of the sleeve section 15b forming sealing cap wall provided drain channel, but the opening 19th is designed to have a channel inside the sleeve section 15b forming sealing cap wall.

The opening wall preferably has, as in 4c shown, two opposite wall sections 19a , 19b on that in a cross section along a plane in which the geometric spindle axis 4th lies at an angle to the geometric spindle axis 4th run. The wall sections 19a , 19b run here and preferably starting from the radial inside of the sleeve section 15b to the radial outside of the sleeve section 15b in a direction that is a directional component from the first drive connector 10th in the direction of the second drive connection 11 having. The wall sections 19a , 19b thus form a channel that extends radially from the inside out through the material of the sleeve portion 15b extends and one to the geometric spindle axis 4th angular course with a directional component from the first drive connection 10th in the direction of the second drive connection 11 having. As a result, liquid runs out of the sealing cap 15 sloping downwards.

How 4b illustrates, can also in this embodiment with the spindle drive in its extended position 1 into the sealing cap 15 liquid immediately coming out of this through the opening 19th flow out.

It is further here and preferably so that the annulus 16 from the second drive connection 11 facing side of the sealing cap 15 only up to about the axial height of the opening 19th enough. The sleeve section has a further axial course 15b then here and preferably a larger wall thickness, the sealing cap wall radially inwards almost to the inner tube of the housing 5a or preferably even up to the inner tube of the housing 5a enough. So here is a constriction between the inside of the sleeve section 15b and the outside of the housing inner tube 5a educated. Now dives when adjusting the spindle drive 1 the housing outer tube in its retracted position 5b in the annulus 16 any liquid from the housing outer tube 5b from the annulus 16 axially past the constriction in the direction of the cover section 15c displaced, causing the liquid to enter the area of the opening 19th arrives and there from the sealing cap 15 can flow out.

QUOTES INCLUDE IN THE DESCRIPTION

This list of documents listed by the applicant has been generated automatically and is only included for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• DE 102016120178 A1 [0004, 0029]

Claims (15)

Spindle drive for an adjusting element (2) of a motor vehicle, a tubular drive housing (5) with a housing inner tube (5a) and a housing outer tube (5b) which telescopically run into one another when the spindle drive (1) is adjusted between an extended position and a retracted position, A spindle-spindle nut gear (7) with a spindle (8) and a spindle nut (9) in meshing engagement with it in the drive housing (5) for generating linear drive movements along the geometric spindle axis (4) of the spindle (8 ) is provided, with a first drive connection (10) and a second drive connection (11) being provided for leading out the drive movements, a sealing cap (15) being provided which closes the drive housing (5) in the region of the first drive connection (10) and that of a drive train component (13) of the spindle drive (1), which comprises the first drive connection (10) st, is penetrated, the sealing cap (15) being axially fixed to the housing inner tube (5a), an annular space (16) being formed between the radial outside of the housing inner tube (5a) and the radial inside of the sealing cap (15) the housing outer tube (5b) is immersed axially when the spindle drive (1) is moved from the extended position to the retracted position, characterized in that the sealing cap (15) has at least one drain recess () which is radially spaced and / or offset from the geometric spindle axis (4) 17, 18, 19). Spindle drive after Claim 1 characterized in that at least one drain recess (17) is an edge-side recess (17) on the axial edge (15a) of the sealing cap (15) facing the second drive connection (11), and / or that at least one drain recess (18, 19) there is an opening (18, 19) in the sealing cap (15). Spindle drive after Claim 1 or 2nd , characterized in that several drain recesses (17, 18, 19) are provided in the circumferential direction, in particular evenly distributed over the circumference. Spindle drive according to one of the preceding claims, characterized in that the respective edge-side recess (17) has recess side edges (17a) and that at least one recess side edge (17a), preferably both recess side edges (17a), each with an axially outer edge (15a) of the sealing cap (15), which faces the second drive connection (11), meet in a corner (20), and / or that the respective edge-side recess (17) has recess side edges (17a) and that at least one recess side edge (17a), preferably Both recess side edges (17a), each with a recess base edge (17b) of the recess (17) facing the second drive connection (11), meet in a corner (20). Spindle drive according to one of the preceding claims, characterized in that at least one recess side edge (17a), preferably both recess side edges (17a), run parallel to the geometric spindle axis (4), and / or that the recess base edge (17b) in one to the geometric spindle axis ( 4) orthogonal plane. Spindle drive according to one of the preceding claims, characterized in that the housing outer tube (5b) is in the retracted position with the edge-side recess (17) in at least sections, preferably in complete, radial overlap. Spindle drive according to one of the preceding claims, characterized in that the axial edge (21) of the housing outer tube (5b) which faces the first drive connection (10) has a circumferential chamfer (21a) which is preferably directed radially outwards. Spindle drive according to one of the preceding claims, characterized in that the sealing cap (15) has a sleeve section (15b) and a cover section (15c), preferably that the cover section (15c) has a drive connection opening (22) which is coaxial with the geometric spindle axis (4) through which the drive train component (13) which penetrates the sealing cap (15) is passed, further preferably that the at least one drain recess (17, 18, 19) is radially spaced from the drive connection opening (22). Spindle drive according to one of the preceding claims, characterized in that at least one opening forming an outlet recess (18, 19) is formed in the sleeve section (15b) and / or at least one opening forming an outlet recess (18, 19) in the cover section (15c) . Spindle drive after Claim 9 , characterized in that at least one opening forming an outlet recess (18) opens into an outlet channel (23) which is formed by a radial sealing cap projection (24) which is arranged on the sleeve section (15b) and radially, in particular radially outwardly, with respect thereto protrudes, preferably that the drain channel (23) at least in sections, in particular in one end section, axially in the direction of the second Drive connection (11) to a channel outlet (23a), in particular to an axial channel outlet (23a). Spindle drive after Claim 9 or 10th , characterized in that at least one opening forming an outlet recess (18) opens into an outlet channel which is formed by an axial sealing cap projection which is arranged on the cover section (15c) and projects axially, in particular axially outwards, preferably, that the drainage channel extends at least in sections, in particular in an end section, radially outward to a channel outlet, in particular to a radial channel outlet. Spindle drive according to one of the Claims 9 to 11 , characterized in that at least one opening forming a drainage recess (19) has an opening wall formed by the material of the sleeve section (15b), preferably that the opening wall has two opposite wall sections (19a, 19b), which are in a cross section along a plane , in which the geometric spindle axis (4) lies, run at an angle to the geometric spindle axis (4), further preferably that the wall sections (19a, 19b) proceed from the radial inside of the sleeve section (15b) to the radial outside of the sleeve section (15b) in run in a direction which has a direction component from the first drive connection (10) in the direction of the second drive connection (11). Spindle drive according to one of the preceding claims, characterized in that a drive motor (6) is provided in the drive housing (5), to which the spindle-spindle nut gear (7) is connected in terms of drive technology, the drive housing (5) and the spindle-spindle nut gear (7 ) are arranged one behind the other in the drive housing (5) along the spindle axis (4), preferably that the spindle (8) is coupled to the drive motor (6), possibly via an intermediate gear, in terms of drive technology. Spindle drive according to one of the preceding claims, characterized in that a guide tube (12) is axially fixed to the first drive connection (10) and, together with the first drive connection (10), forms the drive train component (13) which penetrates the sealing cap (15) , wherein the drive train component (13) is axially fixed to the spindle nut (9) of the spindle-spindle nut transmission (7), or that the spindle (8) or the drive motor (6) is connected axially fixed to the first drive connection (10) and together with the first drive connection (10) forms the drive train component (13) which penetrates the sealing cap (15). Spindle drive according to one of the preceding claims, characterized in that for sealing between the drive connection opening (22) and the drive train component (13) passed through it, the sealing cap (15) is at least partially elastic and is sealingly in contact with the drive train component (13).

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