DE202009006216U1 - Spindle drive for an adjusting element of a motor vehicle - Google Patents

Abstract

Spindle drive for an adjusting element (1) of a motor vehicle with a drive motor (2), a spindle spindle nut transmission (3) connected downstream of the drive motor (2) for generating linear drive movements and with two connections (4, 5) for discharging the drive movements, at least one on the spindle longitudinal axis (7) aligned, one-piece helical compression spring (8) is provided for biasing the spindle drive in particular in the extended position, characterized in that the helical compression spring (8) to adapt to the prevailing in the spindle drive geometric conditions spring coils (9) of different diameters having.

Description

The The present invention relates to a spindle drive for an adjusting element of a motor vehicle according to the The preamble of claim 1 and a helical compression spring of a such spindle drive according to claim 19.

Of the Spindle drive in question can be for all sorts Adjustment of a motor vehicle find application. Examples this is a flap, in particular a tailgate, a trunk lid, a bonnet, a side door, a cargo compartment door, a lifting roof o. The like. A motor vehicle.

A well-known spindle drive ( DE 20 2005 003 466 U1 ), from which the invention proceeds, is used to adjust a tailgate of a motor vehicle. The spindle drive is equipped with a drive motor and a spindle spindle nut transmission connected downstream of the drive motor for generating drive movements. For discharging the drive movements two connections are provided, which are biased by means of several one-piece helical compression springs against each other.

at the known spindle drive is the spindle nut with a guide tube connected, on the one hand the leadership of the spindle nut protruding spindle serves and on the other hand over a guide sleeve of the leadership of a the helical compression springs is used.

at the adjustment of the known spindle drive in the retracted Position is always a slight side To observe buckling of helical compression springs, the above Helical compression spring over the guide sleeve is intercepted. The bulging can basically cause problems in the end region of the guide sleeve, in which the guide sleeve together with the guide tube and the spindle nut directed toward the spindle paragraph forms. If the helical compression spring by their above bulging Engaging with this paragraph can cause a snagging and come to cracking noise in the further adjustment of the spindle drive. This noise is the user as comfort loss seen.

Of the Invention is based on the problem, the known spindle drive in such a way and further develop, that the interaction between the helical compression spring and the spindle drive in the rest is optimized.

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

Essential is the realization that by the equipment of the helical compression spring with spring coils of different diameters in a simple manner an adaptation of the helical compression spring to that in the spindle drive prevailing geometrical conditions is possible. A complex adaptation of these geometrical conditions, for example through the use of additional guide sleeves o. The like., Can with the proposed solution omitted.

In particularly preferred embodiment according to claim 7, the above adaptation of the helical compression spring is due to in that the helical compression spring has longitudinal sections which have at least partially different average diameter. This allows the helical compression spring targeted to the respective free Space to be laid out.

at another preferred variant according to claim 13 it is so that the helical compression spring with guide turns is equipped to guide the helical compression spring stand in engagement with a guide surface or can be brought and that the remaining spring coils of the Guide surface free turns are. Such leadership turns replace guide sleeves cost-effectively, So far, the adaptation of prevailing in the spindle drive geometric Conditions served to the coil spring.

To another teaching according to claim 19, also independent significance, is the helical compression spring the proposed spin delantriebs as such claimed. On all designs that are suitable to explain the claimed coil spring may referenced become.

in the The invention will be described below with reference to a purely exemplary embodiment illustrative drawing explained in more detail. In the Drawing shows

1 in a very schematic representation of the rear area of a motor vehicle with a tailgate, which is equipped with a proposed spindle drive,

2 the spindle drive according to 1 in the extended position in a sectional side view,

3 the spindle drive according to 1 in the retracted position in a sectional side view,

4 the helical compression spring of the locker according to drive 1 in a side view,

5 the helical compression spring according to 4 in the sectional view A and

6 the helical compression spring according to 4 in a perspective view.

The spindle drive shown in the drawing serves for the motorized adjustment of an adjusting element designed as a tailgate 1 , This is advantageous, but not restrictive to understand. Rather, the proposed spindle drive can be used for all possible adjusting elements of a motor vehicle, as will be explained below.

The spindle drive is equipped with a drive motor 2 , a drive motor 2 downstream spindle spindle nut transmission 3 for generating linear drive movements and with two connections 4 . 5 equipped to remove the drive movements. Between the drive motor 2 and the spindle-spindle nut transmission 3 is here and preferably an especially as Plane tenradgetriebe ausgestaltetes intermediate gear 6 switched, which plays no role for the proposed solution.

The spindle drive points to the spindle axis 7 aligned, one-piece helical compression spring 8th on, which serves the bias of the spindle drive here and preferably in the extended position. In principle, several helical compression springs can also be used here.

The helical compression spring 8th the proposed spindle drive is particularly important in the field of application of the motorized adjustment of tailgates special importance. It affects the weight of the tailgate 1 opposite. Preferably, the helical compression spring 8th with regard to the weight of the tailgate 1 designed so that the resulting state comes as close as possible to a state of equilibrium. In terms of an optimal approach, as mentioned above, several, in particular different helical compression springs 8th be provided. The following is representative of possibly several helical compression springs 8th only from a single helical compression spring 8th the speech.

It can be the representations in the 4 to 6 infer that the proposed helical compression spring 8th deviates from the usual embodiment in so far as they spring coils 9 having different diameters. This can be realized on the one hand longitudinal sections of different diameters, over which the helical compression spring 8th can be adapted to the available space. It is also conceivable that the helical compression spring 8th even with geometries to their own leadership can be equipped. In all cases it is so that the equipment of the helical compression spring 8th with spring coils 9 different diameter serves to the helical compression spring 8th optimally adapted to the prevailing geometric conditions in the spindle drive.

Around better present the proposed teaching first, the above mentioned, explained in the spindle drive geometric conditions.

The 2 and 3 show that the proposed spindle drive housing 10 in which the spindle spindle nut transmission 3 , the helical compression spring 8th and the drive motor 2 are arranged. Accordingly, there is also the above-mentioned intermediate gear 6 in the case 10 , Basically, the drive motor 2 and / or the intermediate gear 6 as well as other drive components and couplings o. The like. Outside the housing 10 be arranged. Possibly. Then another housing for these drive components is provided.

The detailed representation in 2 shows that the case 10 one with one of the two connections 4 connected inner tube 10a and one with the other connection 5 connected, telescopic against the inner tube 10a movable outer tube 10b having.

The spindle 11 of spindle spindle nut transmission 3 is opposite one of the two ports 4 . 5 , here and preferably with the inner tube 10a connected connection 4 , axially fixed and rotatably mounted. The spindle nut 12 of spindle spindle nut transmission 3 on the other hand is with the other connection 5 , here and preferably with the outer tube 10b connected connection 5 , via a guide tube 13 connected, depending on the position of the spindle drive, a spindle portion outside the guide tube 13 and a spindle portion within the guide tube 13 is located.

The helical compression spring 8th encloses the spindle 11 and extends substantially the entire length of the spindle 11 , It is conceivable that the helical compression spring 8th also only over a longitudinal section of the spindle 11 extends. In the embodiment shown is accompanied by the fact that the helical compression spring 8th also the guide tube 13 encloses and that the helical compression spring 8th over the entire length of the guide tube 13 extends. Again, it may be provided that the helical compression spring 8th only over a longitudinal section of the guide tube 13 extends.

The guide tube 13 forms inside an additional guide for the spindle 11 of spindle spindle nut transmission 3 , This is the spindle 11 end with a sliding element 11a fitted. The guide tube 13 also serves with its outside the leadership of the helical compression spring 8th , It can be a synopsis of 2 and 3 Take that out of the guide tube 13 a buckling of the helical compression spring 8th counteracts. For this purpose, the guide tube 13 as is generally known from the prior art, be surrounded by a guide sleeve, not shown.

It can be the detail view in 2 Take that out of the spindle nut 12 together with the guide tube 13 end a radial, to the spindle 11 directed paragraph 14 forms, which is hereinafter referred to as "spindle nut heel". It can also be seen from this illustration that the spindle nut heel 14 to the helical compression spring 8th is exposed and that with the adjustment of the spindle drive an axial displacement of the spindle nut paragraph 14 relative to the spring coils 9 the helical compression spring 8th accompanied.

In addition to the spindle nut heel 14 forms the inner tube 10a a radial end to the outer tube 10b directed paragraph 15 hereafter referred to as "housing heel". Again, it is so that with the adjustment of the spindle drive an axial displacement of the housing paragraph 15 relative to the spring coils 9 the helical compression spring 8th accompanied.

The detail view in 2 shows that the inner tube 10a end with the outer tube 10b is positively engaged in the sense of rotation. This is addressed here only in terms of a complete presentation and is not relevant to the proposed teaching.

It is essential now that the helical compression spring 8th lengths 16 . 17 . 18 having, here and preferably all different average diameters, in such a way that the helical compression spring 8th free of predetermined parts of the spindle drive, here and preferably of the spindle nut paragraph 14 and the housing shoulder 15 , remains. This will now be explained in detail.

It can best be seen in the illustrations 5 and 6 Take that out of the helical compression spring 8th a length section 16 having smaller mean diameter, which will be referred to as "inner portion" hereinafter. To the interior section 16 closes over a transitional section 17 a lengthened section 18 larger average diameter, which is hereinafter referred to as "outer section". The transition section 17 can in principle also be omitted, so that the transition between the inner section 16 and the outside section 18 then takes place only at a crossing point.

In a particularly preferred embodiment, the average diameter of the transition section 17 between the mean diameter of the inner section 16 and the mean diameter of the outer portion 18 ,

Now is the spindle drive in the extended position in which the helical compression spring 8th is minimal or not tensioned, so is the spindle nut heel 14 in the transition section 17 located. This is the spindle nut heel 14 already in one opposite the interior section 16 expanded length section of the helical compression spring 8th so that the radial distance between the spindle nut shoulder 14 and the spring coils 9 is increased accordingly. In the in 3 shown, retracted position of the spindle drive is the spindle nut heel 14 even in the additionally widened outer section 18 located. This reduces the risk of entanglement between the spindle nut heel 14 and the spring coils 9 , The spindle nut heel 14 remains at one on the tensioning of the helical compression spring 8th receding lateral bulges of the helical compression spring 8th free from the helical compression spring 8th ,

Similarly good results can be achieved by the fact that the spindle nut heel 14 in the extended position already in the outer section 18 or, if a transitional section 17 is missing, located in the area of the appropriate crossing point.

The above basic principle of avoiding the engagement between the helical compression spring 8th and a part of the spindle drive can also be on the housing paragraph 15 apply. It leaves again the detail view in 2 take that the housing paragraph 15 in the extended position in the transition section 17 is located and that the housing paragraph 15 in the retracted position ( 3 ) in the interior section 16 is located. This also ensures that the radial distance between the housing paragraph 15 and the spring coils is comparatively large.

This remains with a suitable design of the housing paragraph 15 even at a on the tensioning of the helical compression spring 8th receding lateral bulges of the helical compression spring 8th free from the helical compression spring 8th ,

The different diameters of the spring coils 9 the helical compression spring 8th can also in the context of the leadership of the helical compression spring 8th play an important role in particular to avoid their buckling. Preferably, the guide tube forms 13 then a guide surface 19 for the interior section 16 the helical compression spring 8th and the housing inner wall, here and preferably the inner surface of the inner tube 10a , a guide surface 20 for the outer section ( 18 ) of the helical compression spring ( 8th ).

The guide of the helical compression spring 8th can be influenced in particular by the respectively realized winding pattern. Every length section 16 . 17 . 18 is basically equipped with such a winding pattern. This also applies in the event that the helical compression spring 8th at all only consists of a single length.

The winding pattern describes in the present sense the course of the diameter of the spring coils 9 over the length of the respective length section 16 . 17 . 18 or over the length of the helical compression spring 8th ,

The transition section 17 for example, has a winding pattern with turns of constant diameter. The outer section 18 and the interior section 16 on the other hand, turn patterns with turns of periodically alternating different diameters. The reason for this is clear from the following explanations.

The interior section 16 and the outside section 18 the helical compression spring 8th show leadership turns 9b . 9c on, leading to the helical compression spring 8th in engagement with a respective guide surface 19 . 20 stand or be brought. The remaining spring coils 9a the two sections 16 . 18 are designed as free spring coils, with respect to the respective guide surface 19 . 20 are set back radially and thus disengaged from the respective guide surface 19 . 20 stand. The free spring coils 9a of the interior section 16 are radially outward, the free spring coils 9a of the outer section 18 are set back radially inwards. Here are and preferably the diameter of the free spring coils 9a of the interior section 16 and the outer section 18 In essence, essentially identical.

The guide surfaces 19 . 20 are here and preferably of a housing inner wall, in particular of the inner surface of the inner tube 10a and, alternatively or additionally, from the outer surface of the guide tube 13 educated. Other guiding surfaces 19 . 20 are conceivable depending on the configuration of the spindle drive.

In detail, the outer section now points 18 the helical compression spring 8th leadership turns 9c and free turns 9a on, wherein here and preferably the inner surface of the inner tube 10a the these leadership turns 9c associated guide surface 20 provides.

Furthermore, it is so that the inner section 16 the helical compression spring 8th leadership turns 9b and free spring coils 9a having, wherein the outer surface of the guide tube 13 the these leadership turns 9b associated guide surface 19 provides.

In 5 are those through the guide tube 13 on the one hand and the inner tube 10a on the other hand provided guide surfaces 19 . 20 shown schematically. From this representation shows that the leadership turns 9b of the interior section 16 with the guide tube 13 provided guide surface 19 are engaged or bringable and that the guiding turns 9c of the outer section 18 with the inner tube 10a provided guide surface 20 are engaged or can be brought.

It is noticeable that in the respective length section 16 . 18 the helical compression spring 8th the number of free turns 9a much larger than the number of guide turns 9b . 9c is. Here and preferably, the ratio of the number of free turns 9a to the number of guide turns 9b . 9c in a range between 3: 1 and 5: 4, in particular in a range between 2: 1 and 3: 2. This ensures that a large part of the spring coils 9 not at all engaged with the guide surfaces 19 . 20 comes, which has beneficial effects on the noise.

Furthermore, in particular with regard to the leadership of the helical compression spring 8th in the outer section 18 advantageous to mention that one with the tensioning of the helical compression spring 8th basically connected diameter increase no jamming with respect to the housing 10 caused, as with the diameter difference between the guide turns 9c and the free turns 9a always a sufficient "diameter reserve" is available.

Above all, from the representation in 5 but clear that the helical compression spring 8th by a suitable design of the guide turns 9b . 9c on almost any geometry of external guide surfaces 19 and internal guide surfaces 20 can be adjusted.

A look at the illustration in 5 also shows that the transition section 17 has not been equipped with guide turns and free turns in the above sense. The reason for this is that the potential, the transitional section 17 attributable guide surfaces in any case with extended spindle drive in the region of the guide tube 13 the spindle nut shoulder 14 and in the housing inner wall, the housing shoulder 15 exhibit. It was explained above that an engagement of the helical compression spring 8th with these paragraphs 14 . 15 to avoid, so that the transition section 17 preferably has a winding pattern of constant diameter for all windings. The diameter of the spring coils corresponds 9a of the transitional section 17 preferably the diameter of the free turns 9a of the outer section 18 and the interior section 16 ,

With regard to the representation according to 5 It should be noted that for ease of understanding the free spring coils of the outer section 18 and the interior section 16 provided with the symbol "0" are that the guide turns 9b of the interior section 16 are provided with the symbol "-" and that the guide turns 9c of the outer section 18 are marked with the symbol "+". Thus smaller "-", middle "0" and larger "+" diameters are recognizable at first glance.

It was explained above that the proposed spindle drive in all possible adjusting elements 1 a motor vehicle application can find. In a particularly preferred embodiment, it is in the adjustment 1 a flap, in particular a tailgate, a trunk lid, a door, in particular a side door, an engine hood o. The like. Of a motor vehicle.

According to another teaching, which has independent significance, the helical compression spring 8th the proposed spindle drive claimed as such. Reference may be made to the above statements, as far as they are suitable, the proposed helical compression spring 8th to describe.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 202005003466 U1 [0003]

Claims (19)

Spindle drive for an adjusting element ( 1 ) of a motor vehicle with a drive motor ( 2 ), a drive motor ( 2 ) downstream spindle spindle nut transmission ( 3 ) for generating linear drive movements and with two connections ( 4 . 5 ) for discharging the drive movements, wherein at least one on the spindle longitudinal axis ( 7 ) aligned, one-piece helical compression spring ( 8th ) is provided for biasing the spindle drive in particular in the extended position, characterized in that the helical compression spring ( 8th ) to adapt them to the prevailing geometric conditions in the spindle drive spring coils ( 9 ) of different diameters. Spindle drive according to claim 1, characterized in that a housing ( 10 ) is provided in which the spindle spindle nut transmission ( 3 ), the helical compression spring ( 8th ) and preferably the drive motor ( 2 ) are arranged, preferably, that the housing ( 10 ) with one of the two connectors ( 4 ) connected inner tube ( 10a ) and one with the other connection ( 5 ) connected, telescopically with respect to the inner tube ( 10a ) displaceable outer tube ( 10b ) having. Spindle drive according to claim 1 or 2, characterized in that the spindle ( 11 ) of the spindle spindle nut transmission ( 3 ) opposite one of the two connections ( 4 . 5 ), in particular with the inner tube ( 10a ) connected connection ( 4 ), axially fixed and rotatably mounted, that the spindle nut ( 12 ) of the spindle spindle nut transmission ( 3 ) with the other connection ( 5 ), in particular with the outer tube ( 10b ) connected connection ( 5 ), via a guide tube ( 13 ) and that a spindle section outside the guide tube ( 13 ) and a spindle portion is located within the guide tube. Spindle drive according to one of the preceding claims, characterized in that the helical compression spring ( 8th ) at least over a longitudinal section of the spindle ( 11 ), preferably substantially over the entire length of the spindle ( 11 ), the spindle ( 11 ) in each case enclosing, extending and / or that the helical compression spring ( 8th ) at least over a longitudinal section of the guide tube ( 13 ), preferably substantially over the entire length of the guide tube ( 13 ), the guide tube ( 13 ) each enclosing extends. Spindle drive according to one of the preceding claims, characterized in that the spindle nut ( 12 ) and / or the guide tube ( 13 ) and / or a guide tube ( 13 ) surrounding guide sleeve end a radial, to the spindle ( 11 ) - Spindle nut heel ( 14 ) - forms and that with the adjustment of the spindle drive an axial displacement of the spindle nut paragraph ( 14 ) relative to the spring coils ( 9 ) of the helical compression spring ( 8th ). Spindle drive according to one of the preceding claims, characterized in that the inner tube ( 10a ) end a radial, to the outer tube ( 10b ) paragraph - housing sales ( 15 ) - forms and that with the adjustment of the spindle drive an axial displacement of the housing sales ( 15 ) relative to the spring coils ( 9 ) of the helical compression spring ( 8th ). Spindle drive according to one of the preceding claims, characterized in that the helical compression spring ( 8th ) Has length sections which at least partially have different average diameters such that the helical compression spring ( 8th ) free of predetermined parts of the spindle drive, in particular of the spindle nut paragraph ( 14 ) and / or the housing paragraph ( 15 ), remains. Spindle drive according to claim 7, characterized in that the helical compression spring ( 8th ) a length portion of smaller mean diameter - inner portion ( 16 ) - and at a crossing point or a transitional section ( 17 ) thereafter a length section of larger average diameter - outer section ( 18 ), Preferably, that the mean diameter of the transition section ( 17 ) between the mean diameter of the inner section ( 16 ) and the mean diameter of the outer section ( 18 ) lies. Spindle drive according to claim 5 and optionally according to one of claims 6 to 8, characterized in that the spindle nut shoulder ( 14 ) in the extended position in the outer section ( 18 ) or in the transitional period ( 17 ) or in the region of the transition point and, preferably, that the spindle nut shoulder ( 14 ) in the retracted position in the outer section ( 18 ), so that the spindle nut heel ( 14 ) even with a slight, on the tensioning of the helical compression spring ( 8th ) receding lateral bulges of the helical compression spring ( 8th ) free of the helical compression spring ( 8th ) remains. Spindle drive according to claim 6 and optionally according to claim 7 to 9, characterized in that the housing shoulder ( 15 ) in the extended position in the inner section ( 18 ) or in the transitional period ( 17 ) and, preferably, that the housing heel ( 15 ) in the retracted position in the inner section ( 16 ), so that the housing shoulder ( 15 ) even with a slight, on the tensioning of the helical compression spring ( 8th ) receding lateral bulges of the helical compression spring ( 8th ) free of the helical compression spring ( 8th ) remains. Spindle drive according to claims 3 and 8 and optionally according to claim 9 or 10, characterized in that the guide tube ( 13 ) a guide surface ( 19 ) for a length section ( 16 ), in particular the inner section ( 16 ) of the helical compression spring ( 8th ), and the housing inner wall, in particular the inner surface of the inner tube ( 10a ), a guide surface ( 20 ) for a different length of section ( 18 ), in particular the outer section ( 18 ) of the helical compression spring ( 8th ). Spindle drive according to one of the preceding claims, characterized in that the helical compression spring ( 8th ) has at least one winding pattern that at least one length section ( 17 ) has a winding pattern with spring turns of constant diameter and / or that at least one length section ( 16 . 17 ) a winding pattern with spring coils ( 9 ) of periodically alternating different diameters. Spindle drive according to one of the preceding claims, characterized in that at least one longitudinal section ( 16 . 18 ) of the helical compression spring ( 8th ) Guide turns ( 9b . 9c ), the compression spring for guiding the screws ( 8th ) in engagement with a guide surface ( 19 . 20 ) or can be brought and that this length section ( 16 . 18 ) otherwise with regard to the guide surface ( 19 . 20 ) radially recessed, free spring coils ( 9a ), which disengage from the guide surface ( 19 . 20 ) stand. Spindle drive according to claims 8 and 13, characterized in that the outer section ( 18 ) of the helical compression spring ( 8th ) Guide turns ( 9c ) and free spring coils ( 9a ) and that a housing inner wall, in particular the inner surface of the inner tube ( 10a ), these leadership turns ( 9c ) associated guide surface ( 20 ). Spindle drive according to claims 8 and 13 and optionally according to claim 14, characterized in that the inner portion ( 16 ) of the helical compression spring ( 8th ) Guide turns ( 9b ) and free spring coils ( 9a ) and that the outer surface of the guide tube ( 13 ) that guide turns ( 9b ) associated guide surface ( 19 ). Spindle drive according to claim 13 and optionally according to one of claims 14 or 15, characterized in that in the respective longitudinal section ( 16 . 18 ) of the helical compression spring ( 8th ) the number of free spring coils ( 9a ) greater than the number of guide turns ( 9b . 9c ), preferably, that the ratio of the number of free spring coils ( 9a ) to the number of guide turns ( 9b . 9c ) is in a range between 3: 1 and 5: 4, in particular in a range between 2: 1 and 3: 2. Spindle drive according to claim 8 and optionally according to one of claims 9 to 16, characterized in that the transition section ( 17 ) a winding pattern with constant diameter for all spring coils ( 9 ) having. Spindle drive according to one of the preceding claims, characterized in that the adjusting element ( 1 ) a tailgate, a trunk lid, a door, in particular a side door, an engine hood o. The like., Of a motor vehicle. Helical compression spring of a spindle drive after a of the preceding claims.