WO2014079593A1

WO2014079593A1 - Spindle drive

Info

Publication number: WO2014079593A1
Application number: PCT/EP2013/064586
Authority: WO
Inventors: Sebastian Heinze; Marcus Klopp; Alwin Macht; Sebastian Engel
Original assignee: Brose Fahrzeugteile Gmbh & Co. Kg, Hallstadt
Priority date: 2012-07-18
Filing date: 2013-07-10
Publication date: 2014-05-30
Also published as: CN104822891A; KR20150036668A; JP2015529757A; JP6320378B2; KR102121632B1; CN104822891B; DE102012014135A1

Abstract

The invention relates to a spindle drive for a valve (2) of a motor vehicle, comprising a motor drive arrangement (6), comprising a spindle gear mechanism (7) drivingly connected downstream of the motor drive arrangement (6), and comprising two drive connections (8, 9) for transmitting drive movements. The spindle gear mechanism (7) has a spindle (10) which can be rotated by the motor drive arrangement (6) and a spindle nut (11) which is engaged with the spindle in a rotationally fixed manner. The spindle nut (11) carries out an axial retraction movement (12), in which the distance between the two drive connections (8, 9) is reduced, and an axial extension movement (8, 9), in which the distance between the two drive connections (7, 8) is increased, according to the rotational direction of the spindle (10). The spindle nut thread (11a) extends beyond the spindle thread (10a) in the direction of the retraction movement (12) at least in the fully retracted position and surrounds at least one part of the motor drive arrangement (6).

Description

spindle drive

The present invention relates to a spindle drive for a flap of a motor vehicle according to the preamble of claim 1 and to a flap arrangement of a motor vehicle according to claim 14.

The term "flap" is to be understood in the present case, which includes, for example, a tailgate, a boot lid, a hood, a side door, a luggage compartment flap, a lifting roof or the like of a motor vehicle This is not meant to be limiting.

The use of spindle drives for the motorized adjustment of a tailgate of a motor vehicle has become increasingly important in recent years. In addition to a high level of operational reliability, the highest possible compactness is a frequently demanded requirement.

The known spindle drive (DE 10 2008 062 391 A I), from which the invention proceeds, is equipped with a motor drive arrangement and a drive mechanism downstream of the motor drive arrangement spindle gear. A extending over a substantial axial portion of the spindle drive spindle meshes with a spindle nut, which runs accordingly on the spindle. The spindle gear and the motor drive arrangement are arranged one behind the other along the geometric spindle axis. Thus, the length of the spindle drive is anyway determined by the length of the motor Antri ebsanordnung, which basically leads to a limitation of the achievable compactness.

The invention is based on the problem, the known spindle drive in such a way and further develop that its compactness is increased by simple means.

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. What is essential is the consideration that, with a corresponding configuration, it is possible to nest the motor drive arrangement with the spindle drive, as a result of which the length of the spindle drive can be reduced for a given stroke.

Specifically, it is proposed that the spindle nut thread, at least in the fully retracted position, extend beyond the spindle thread in the direction of its retraction movement and surround at least a part of the motor drive arrangement. In the fully retracted position, the motor drive assembly and the spindle nut thread at least partially overlap. This ensures that the motor drive assembly does not or only slightly contributes to the length of the spindle drive in the fully retracted position.

The preferred embodiments according to claims 7 to 9 relate to a particularly compact construction, in which the inner diameter of the spindle nut is matched to the corresponding extent of the spindle nut enclosed by the part of the motor drive assembly. With a tubular drive housing according to claim 8, the compactness in relation to the geometric spindle axis radial direction can be further increased.

The further preferred embodiment according to claim 12 provides a turn compact implementation of the bias of the two drive connections against each other. The outer side of the spindle nut effectively serves as a guide for a helical spring arrangement, which is preferably a helical compression spring arrangement.

According to another teaching according to claim 14, which has independent significance, a flap arrangement of a motor vehicle is claimed with a flap for closing a flap opening and with at least one, the flap associated, proposed spindle drive. On all versions of the proposed spindle drive, which are suitable to describe the flap assembly, may be referenced.

In the following the invention will be explained in more detail with reference to a drawing showing only one exemplary embodiment. In the drawing shows 1 is a schematic side view of the rear of a motor vehicle with a proposed spindle drive and

Fig. 2 shows a spindle drive according to FIG. 1 in the fully retracted

Position in a longitudinal section,

Fig. 3 shows a spindle drive according to FIG. 1 in the fully extended

Position in longitudinal section,

4 shows a second embodiment of a spindle drive according to FIG. 1 in the completely retracted position in longitudinal section, FIG.

Fig. 5 shows a third embodiment form of a spindle drive of FIG. 1 in the fully retracted position in longitudinal section and

6 shows a fourth embodiment of a spindle drive according to FIG. 1 in the fully retracted position in longitudinal section.

It should be noted in advance that all explanations to the exemplary embodiment shown in FIGS. 2, 3 also apply to the exemplary embodiments illustrated in FIGS. 4 to 6. In that regard, the reference numerals for functionally identical parts are identical in all embodiments.

The spindle drive 1 shown in the drawing is used for the motorized adjustment of a flap 2 of a motor vehicle, which is designed here as a tailgate. Reference may be made to the above-mentioned, broad interpretation of the term "flap".

The flap 2 is used in the usual way closing a flap opening 3. Here, the spindle drive 1 is arranged laterally of the flap opening 3, here and preferably in a side of the flap opening 3 located gutter 4. Although Fig. 1 shows only a single spindle drive 1. Here and preferably, however, it is provided that both sides of the flap opening 3 each have a spindle drive 1 is arranged. The two spindle drives 1 are designed structurally essentially identical. It can be seen from the illustration according to FIG. 1 that the spindle drive 1 shown there is hinged at one end to the body 5 of the motor vehicle and at the other end to the flap 2. The spindle drive 1 advantageously has only a small length, which results from the proposed structure of the spindle drive 1.

The spindle drive 1 has a motor drive arrangement 6, which is drive-connected downstream of a spindle drive 7. Furthermore, the spindle drive 1 is equipped with two drive connections 8, 9, which serve to remove drive movements.

The spindle gear 7 is designed as a spindle-spindle nut gear and has a rotatable from the motor drive assembly 6 spindle 10 and a standing with the spindle 10 in engagement, relative to the spindle drive 1 a total rotationally fixed spindle nut 1 1. Depending on the direction of rotation of the spindle 10, the spindle nut 1 1 performs an axial retraction movement 12, in which the distance between the two drive terminals 8, 9 decreases, and an axial extension movement 13, in which increases the distance between the two drive terminals 8, 9.

The spindle 10 is in a conventional manner with a spindle thread 10 a and the spindle nut 1 1 is also provided in a conventional manner with a spindle nut thread 1 la. In any case, depending on the design constraints, the spindle nut thread 11a may extend over only an axial part of the spindle nut 11.

The terms "axial" and "radial" are in the present case always related to the geometric spindle axis 14.

It is essential that the spindle nut thread 1a extends at least in the completely retracted position shown in FIG. 2 in the direction of the retraction movement 12 beyond the spindle thread 10a and encloses at least part of the motor drive arrangement 6. Fig. 2 shows that an interleaving of the drive assembly 6 with the spindle nut 1 1 is thus achieved, which is associated with a particularly short design of the spindle drive 1. FIG. 2 further shows that the spindle nut thread 11a in the completely retracted position encloses the motor drive arrangement 6 over its entire axial extent. This achieves a maximum component density along the geometric spindle axis 14. In any case, it is advantageous if the spindle nut thread 1 la in the completely retracted position surrounds the motor drive arrangement 6 over more than half its axial extent.

2, 3 is the fact that the part of the spindle nut thread 10a "overshooting" via the spindle thread 10a constitutes more than 70% of the axial extent of the spindle nut thread 1a 2, 3, this means that the entire threaded section of the spindle nut thread 1 a required for the extension movement 13 is provided by the overshooting part of the spindle drive 1 has been fully utilized.

Particularly advantageous in the case of the spindle drive 1 shown in FIGS. 2, 3 is the fact that the components there are arranged substantially coaxially. For example, the motor drive assembly 6 has a drive motor 15 with a drive shaft, not shown, which is aligned coaxially with the geometric spindle axis 14. Further, the motor Antri ebsanordnung 6 a the drive motor 15 drivingly downstream intermediate gear 16, which is aligned in a particularly preferred embodiment coaxially to the geometric spindle axis 14. The intermediate gear 16 is preferably designed as a torque-transmission gear.

A coaxial alignment with the geometric spindle axis 14 of the intermediate gear 16 can be easily realized that the intermediate gear 16 is designed as a planetary gear. The coaxial orientation of the planetary gear 16 to the geometric spindle axis 14 preferably means that the sun gear, the planet carrier and the ring gear of the planetary gear 16 are aligned according to coaxial with the geometric spindle axis 14. In the embodiment of the drive assembly 6 with intermediate gear 16, it is provided in a particularly preferred embodiment of FIG. 4 that the Spindle nut gear II a in the fully retracted position in the direction of the retraction movement 12 maximum to the drive motor 15, the intermediate gear 16 comprising extends. Clarification may be made that embracing the drive motor 1 5 is not provided by the spindle nut transmission 1 la in this embodiment. This can be seen from the illustration according to FIG. 4 and can be particularly advantageous, for example, if the intermediate gear 16 is of a smaller cross section than the drive motor 17, as will be explained in detail below.

In terms of a high packing density, the spindle 10 and the motor drive assembly 6 along the geometric spindle axis 14 are preferably arranged directly behind one another.

The illustrated in the drawing structural structure of the spindle drive 1 provides a high level of robustness not only in terms of the delivery of driving forces, but also with regard to possibly unfavorable environmental conditions such as moisture, dust o. The like. It is initially provided that the spindle nut 1 1 is designed tubular with an inner diameter which is at least slightly larger than the corresponding extent of the enclosed by the spindle nut 1 1 part of the motor drive assembly 6. The spindle 10 has a correspondingly large outer diameter on to ensure engagement with the spindle nut 1 1.

Of interest in the embodiment shown in FIGS. 2, 3 is the fact that the motor A ntri ebsan order 6 has a tubular drive housing 17 through which the spindle nut 1 1 moves in the E i nfahrbe movement with play. To bridge the gap between the spindle nut 1 1 and the drive housing 17, a here and preferably annular slide assembly 1 8 is provided which slides on the drive housing 17. The slide assembly 18 may have a sealing function and / or a bearing function. The sliding assembly 1 8 is located at an axial end of the spindle nut 1 1. Preferably, in the sliding assembly 18 is an attachment which adhered to the spindle nut 1 1, clipped o. The like. Is.

For the above-mentioned case that the spindle nut thread 1 la only the intermediate gear 16, and not the drive motor 15 includes, it is preferred way, that the drive housing 17 has a first axial portion 17 a, which receives the intermediate gear 16, and a second axial portion 17 b, which receives the drive motor 15 has. The first axial portion 17 a has a smaller cross-section than the second axial portion 17 b, wherein the spindle nut thread 1 1 a in the fully retracted position in the direction of A fah rbe movement 12 extends to a maximum extent to the second portion 17 b. 4 shows that this makes it possible to achieve a particularly compact design with regard to the outer diameter of the spindle drive.

Of particular importance for the operability of the spindle drive 1 is that the spindle nut 11 with the motor drive assembly 6, here and preferably with the drive housing 17 of the motor drive assembly 6, is rotationally engaged. For the realization of the rotation, the slide assembly 18 can be used by any kind of positive connection between the slide assembly 18 and the drive housing 17 is provided. In the simplest case, the drive housing 17 is provided with a parallel to the geometric spindle axis 14 aligned groove into which a provided on the slide assembly 18 web engages. Other variants for the anti-rotation are conceivable.

It is understood that the tubular spindle nut 11 is configured in cross-section substantially circular. Accordingly, it is here and preferably such that the tubular drive housing 17 is at least partially equipped in a substantially circular manner. The tubular spindle nut and / or the tubular drive housing 17 is in a particularly preferred embodiment, a sheet metal part, which has preferably been produced by deep-drawing, wherein the spindle nut thread can be injected, for example by plastic injection molding.

The two drive connections 8, 9 are each equipped with a ball socket 8a, 9a, which can be brought into engagement with corresponding ball heads during assembly of the spindle drive 1. The drive terminals 8, 9 are each connected to a cap 19, 20. In this case, one drive connection 8 is connected via the cap 19 to one end of the spindle nut 11. This compound can be done, for example, by crimping or the like. The other drive conclusion 9 is connected via the cap 20 with the motor drive assembly 6, here with the drive housing 17 of the motor drive assembly 6. Here, too, offers a crimp connection.

In order to assist the motor drive arrangement 6 in the adjustment of the flap 2, a spring arrangement 21 is preferably provided, which biases the two drive connections 8, 9 against each other. It may be advantageous depending on the application, that the two drive terminals 8, 9 towards each other, or just apart, are biased. In the exemplary embodiment shown in FIGS. 2, 3, the spring arrangement 21 is designed as a helical spring arrangement, here and preferably as a helical compression spring arrangement, which presses apart the two drive connections 8, 9. All versions of a helical compression spring arrangement apply accordingly to a helical tension spring arrangement. The coil spring assembly 21 is concentrically aligned with the geometric spindle axis 14 and surrounds the spindle nut 1 1. Here and preferably, it is such that the coil spring assembly 2 1 surrounds the spindle nut 1 1 with a certain play.

In the embodiment shown in FIGS. 2, 3, the helical compression spring arrangement 21 has only a single helical compression spring. It is conceivable, however, that the helical compression spring assembly 2 1 comprises a plurality of helical compression springs, which result in a very specific, tailored to the kinematics of the flap 2 spring characteristic. In the alternative embodiment with Schraubenzugfederanordnung at least one helical tension spring is provided, wherein the spring on both sides over about three spring coils on the caps 19, 20 o. The like. May be screwed.

Interesting in the embodiment shown in FIGS. 2, 3 is still the fact that the helical compression spring of the helical compression spring assembly 2 1 has a spring wire of polygonal cross-section, here and preferably of rectangular or even square cross-section. With such a configuration, the compactness in relation to the geometric spindle axis 14 radial direction can be further reduced. The preferred embodiment shown in FIG. 4 is equipped with a particularly compact support of the spring arrangement 21. Here it is provided that the spring arrangement 21 is supported on the here and preferably step-shaped transition 17 c between the first section 17 a and the second section 17 b of the drive housing 17. This support can be done directly by the spring assembly 21 is directly engaged with the transition 17c. However, particularly preferred is an indirect engagement of the spring assembly 21 and the transition 17c via a spring guide tube 21 a, as shown in Fig. 4. The spring guide tube 21a surrounds the spring assembly 21 at least in sections and forms in the region of the transition 17c a collar 21b, which is in engagement with the transition 17c. With this arrangement has been achieved that the equipment of the spindle drive 1 with a spring assembly 21 pulls almost no increase in the cross section of the spindle drive 1 by itself.

FIGS. 5 and 6 show a further basic possibility of the compact integration of a spring arrangement 21 in the spindle drive. The here and preferably configured as a helical spring assembly spring assembly 21, which is in a particularly preferred embodiment, a Schraubendruckfe- deranordnung, in turn, concentric with the geometric spindle axis 14 aligned. Interesting here is the fact that the spring assembly 2 1 is enclosed by the spindle nut 1 1. The spring assembly 21 enclosing axial portion of the spindle nut 1 1 is preferably a section without spindle nut thread 1 la. In the embodiments shown in FIGS. 5 and 6, it is such that the spindle nut 1 1 between the engine drive assembly 6 remote drive end 8 and the motor drive assembly 6 has a receiving space 1 1 b for receiving the spring assembly 21. The representations according to FIGS. 5 and 6 it can be seen that with the receiving space Hb thus formed spring arrangements 21 of almost any configuration can be accommodated. In the exemplary embodiments illustrated in FIGS. 5 and 6, the spring arrangement 21 has two helical compression springs 25b, 21c, which are arranged concentrically and interlaced with one another. Further, here and preferably a spring guide tube 21 a is provided which provides a guide for the inner spring 21 b. In the two, in Figs. 5 and 6 illustrated embodiments, the spring assembly 21 is supported on the spindle 10 on the one hand and on the spindle nut 1 1 on the other hand. In that regard, results during the adjustment operation of the spindle drive 1, a relative movement between the spring assembly 21 and the spindle 10 in the form of rotation about the spindle axis 14. To avoid friction losses, in the i to Figs. 5 and 6 illustrated embodiments, a bearing assembly 22 between Spindle 10 and spring assembly 21 is provided. In the simplest case, the bearing assembly consists simply of two discs 22a, 22b, which provide an axial sliding bearing between the spindle 10 and the spring assembly 21.

In the embodiment shown in FIG. 5, the receiving space 1 lb is used exclusively for receiving the spring arrangement 21. It has no influence on the adjustment kinematics of the spindle drive 1.

In the game Ausführungsbei shown in Fig. 6, the receiving space 1 lb is used to increase the displacement of the spindle drive 1. Here, and preferably, it is such that the spindle thread 10a extends axially within the receiving space Ib, wherein, preferably, the spindle thread 10a extends from the motor drive arrangement 15 in the direction of the drive connection 8 facing away from the motor drive arrangement 15. In a particularly preferred embodiment, the spindle 10 is substantially pot-shaped, wherein the cup-shaped spindle 10 receives at least a portion of the spring assembly 21.

As already indicated above, a spring guide tube 21a is provided within the spindle nut 11, which is enclosed by the spring arrangement 21, in particular by the helical compression spring 21b.

In a particularly preferred embodiment, the at least one spindle drive 1 is arranged laterally of the flap opening 3, here and preferably in a gutter 4. Also with regard to this particularly preferred embodiment may be made to the above statements.

According to another teaching, which also has independent significance, a flap arrangement of a motor vehicle with a flap 2 is disclosed. closing a flap opening 3 and with at least one associated with the flap 2, discussed above spindle drive 1 claimed. On all versions of the proposed spindle drive 1 may be referenced.

Claims

claims:

1. Spindle drive for a flap (2) of a motor vehicle with a motor drive arrangement (6), with one of the motor drive assembly (6) drivingly downstream spindle gear (7) and with two drive terminals (8, 9) for discharging drive movements, wherein the spindle gear (7) has a spindle (10) rotatable by the motor drive arrangement (6) and a rotary spindle nut (11) in engagement therewith, the spindle nut (11) depending on the direction of rotation of the spindle (10) an axial retraction movement (12), in which the distance between the two drive connections (8, 9) decreases, and an axial extension movement, in which the distance of the two drive connections (8, 9) increases, takes place,

characterized,

in that the spindle nut thread (11a) extends beyond the spindle thread (10a) at least in the completely retracted position in the direction of the retraction movement (12) and at least part of the motor drive arrangement

(6) encloses.

2. Spindle drive according to claim 1, characterized in that the spindle nut thread (I I a) in the fully retracted position, the motor drive assembly (6) over more than half their axial Hrstreckung, preferably over its entire axial Hrstreckung encloses.

3. Spindle drive according to claim 1 or 2, characterized in that the spindle nut thread (I Ia) extends in the fully retracted position with more than 70% of its axial extent in the direction of retraction (12) via the spindle thread (10 a) addition.

4. Spindelatitieb according to one of the preceding claims, characterized in that the motor-drive arrangement (6) has a drive motor (15) with a drive shaft which is aligned coaxially with the geometric spindle axis (14).

5. Spindle drive according to one of the preceding claims, characterized in that the motor drive arrangement (6) a the drive motor (15) an driving technically downstream intermediate gear (16), preferably that the intermediate gear (16) is designed as a torque-transmission gear, more preferably, that the intermediate gear (16) is designed as a planetary gear. more preferably, that the planetary gear is aligned coaxially with the geometric spindle axis (14).

6. Spindle drive according to one of the preceding claims, characterized in that extending the spindle nut thread (1 1 a) in the fully retracted position in the direction of retraction (12), the intermediate gear 16, maximum to the drive motor (1 5).

7. Spindle drive according to one of the preceding claims, characterized in that the spindle (10) and the motor drive arrangement (6) along the geometric spindle axis (14) are arranged directly behind one another.

8. Spindle drive according to one of the preceding claims, characterized in that the spindle nut (1 1) is configured tubular with an inner diameter which is at least slightly larger than the corresponding extent of the spindle nut (1 1) enclosed part of the motor drive assembly ( 6).

9. Spindle drive according to one of the preceding claims, characterized in that the motor drive arrangement (6) has a tubular drive housing (17) over which the spindle nut (1 1) pushes during the retraction movement (12) with play, preferably, that at the lockers! nut (1 1) a particular annular slide assembly (18) is provided which slides on the drive housing (17), preferably, that the slide assembly (18) at one axial end of the spindle nut (1 1) is located.

10. Spindle drive according to one of the preceding claims, characterized in that the drive housing (17) has a first axial portion (17 a) and a second axial portion (17 b) that the first axial portion (17 a) has a smaller cross-section than the second axial Section (17b) and that the spindle nut thread (II a) in the fully retracted position maximally extends to the second axial portion (17b) of the drive housing (17), preferably that the transition (17c) from the first axial Ab Section (17a) to the second axial portion (17b) in the region of the transition from the intermediate gear (16) to the drive motor (15) is located.

11. locker drive according to one of the preceding claims, characterized in that the spindle nut (1 1) with the motor drive assembly (6), in particular with a drive housing (17) of the motor drive assembly (6), is rotationally engaged.

12. Spindle drive according to one of the preceding claims, characterized in that a drive connection (8) with one end of the spindle nut (1 1) is connected, that the other drive connection (9) with the motor drive assembly (6), in particular with a drive housing (17) of the motor drive assembly (6), is connected and that both drive terminals (8, 9) on the geometric spindle axis (14) are located.

13. Spindle drive according to one of the preceding claims, characterized in that a spring arrangement (21) is provided, which biases the two drive connections (8, 9) against each other.

14. Spindle drive according to claim 13, characterized in that the spring arrangement (21) is designed as a helical spring arrangement, in particular as a helical compression spring arrangement, which is concentrically aligned with the geometric spindle axis (14) and which surrounds the spindle nut (1 1).

15. Spindle drive according to claim 14, characterized in that the helical spring arrangement (21) has at least one helical compression spring with spring wire of polygonal cross-section, in particular rectangular or square cross-section.

16. Spindle drive according to claim 10 and according to one of claims 14 or 15, characterized in that the spring arrangement (21) on the particular stepped transition (17c) between the first portion (17a) and the second portion of the drive housing (17) is supported.

17. Spindle drive according to claim 14 and optionally according to claim 1 5 or 16, characterized in that the spring arrangement (21) as Schraubenfederano- is designed, in particular as Scliraubendruckfederanordnung, which is concentric with the geometric spindle axis (14) and is surrounded by the spindle nut (1 1), preferably, that the spindle nut (14) between the motor-drive assembly (6) facing away from the drive - End (8) and the motor drive assembly (6) encloses a receiving space (I Ib) for receiving the spring assembly (21).

18. Spindle drive according to claim 14 and optionally according to one of claims 15 to 17, characterized in that the spring arrangement (21) on the spindle (10) on the one hand and on the spindle nut (1 1) on the other hand supported.

19. Spindle drive according to one of the preceding claims, characterized in that the spindle thread (10a) extends axially within the receiving space (1 lb), preferably, that the spindle (10) is substantially pot-shaped and that the cup-shaped spindle (10). at least part of the spring assembly (21) receives.

20. Spindle drive according to claim 14 and optionally according to one of claims 15 to 19, characterized in that within the spindle nut (1 1) a spring guide tube (21 a) is provided, which is enclosed by the spring assembly (21).

21, flap assembly of a motor vehicle with a flap (2) for closing a flap opening (3) and at least one, the flap (2) associated with spindle drive (1) according to one of the preceding claims.

22. K lappenanordnung according to claim 21, characterized in that the at least one spindle drive (1) laterally of the flap opening (3), in particular in a gutter (4) is arranged, preferably, that two spindle drives (1) are provided which on opposite sides of the flap opening (3) are arranged.