JP6320378B2 - Spindle drive - Google Patents

Description

  The invention relates to a motor vehicle flap drive apparatus of the type described in the superordinate concept of claim 1 and to a motor vehicle flap device of the type of claim 21.

  The concept of “flap” has a broad meaning in this specification. This concept includes, for example, automobile tailgates, trunk lids, bonnets, side doors, trunk floor panels, lift roofs and the like. Below, it demonstrates mainly in the use range about the adjustment by the motor of the tailgate of a motor vehicle. This is not intended to be limiting.

  The use of spindle drives for motor tailgate motor adjustments has become increasingly important in recent years. In addition to high operational reliability, the highest possible compactness is a requirement that is often imposed.

  A known spindle driving device (German Patent Application Publication No. 102008062391) which is the starting point of the present invention includes a motor driving device and a spindle transmission device connected behind the motor driving device in terms of driving technology. Is provided. The spindle extending over most of the axial direction of the spindle drive meshes with the spindle nut, which moves accordingly along the spindle. The spindle transmission and the motor drive are arranged one after the other along the geometric spindle axis. Therefore, the length of the spindle drive is determined by the length of the motor drive anyway, which basically limits the compactness obtained.

  The object of the present invention is to improve the known spindle drive and to improve the compactness by simple means.

  The above problem is solved by a spindle drive device of the type described in the superordinate concept of claim 1 by means having the features described in the characterizing portion of claim 1.

  What is important is the idea that the motor drive device and the spindle transmission can be nested in a corresponding configuration, thereby reducing the length of the spindle drive device in a given stroke. .

  In particular, it is proposed that the thread of the spindle nut extends beyond the thread of the spindle and at least partially surrounds the motor drive, at least in the position of full entry in the direction of the entry movement. The In the fully advanced position, the motor drive and the spindle nut thread overlap at least partially. This ensures that in the fully advanced position, the length of the spindle drive is not extended or only slightly extended by the motor drive.

  The preferred configuration according to claims 7 to 9 relates to a particularly compact configuration in which the inner diameter of the spindle nut is defined in accordance with the corresponding extent of the part of the motor drive device surrounded by the spindle nut. The tubular drive housing according to claim 9 makes it possible to further increase the compactness in the radial direction with respect to the geometric spindle axis.

  According to a further preferred configuration of the thirteenth aspect, a more compact configuration is realized by preloading both drive connecting portions in opposite directions. In this case, the outer surface of the spindle nut acts to some extent as a guide for the coil spring device. This coil spring device is preferably a compression coil spring device.

  24. A vehicle flap apparatus comprising a flap for closing a flap opening and at least one spindle drive device according to the invention disposed on the flap according to another technique of claim 21 having independent meaning. It is described in the range. Reference may be made to the complete description of the spindle drive according to the invention which is suitable for describing the flap device.

  In the following, the invention will be described in detail with reference to the drawings which show only embodiments.

1 is a side view schematically showing a rear region of an automobile equipped with a spindle driving device according to the present invention. FIG. 2 is a longitudinal sectional view showing the spindle drive device of FIG. 1 in a fully advanced position. FIG. 2 is a longitudinal sectional view showing the spindle drive device of FIG. 1 in a fully advanced position. It is a longitudinal cross-sectional view which shows the 2nd embodiment regarding the spindle drive device of FIG. 1 in the position which approached completely. It is a longitudinal cross-sectional view which shows the 3rd embodiment regarding the spindle drive device of FIG. 1 in the position which approached completely. It is a longitudinal cross-sectional view which shows the 4th embodiment regarding the spindle drive device of FIG. 1 in the position which approached completely.

  First, it should be noted that all descriptions of the embodiments shown in FIGS. 2 and 3 basically apply to the embodiments shown in FIGS. Accordingly, the reference numerals for parts having the same function are the same in all embodiments.

  The spindle drive 1 shown is used for adjusting a flap 2 of a motor vehicle, here a flap 2 which is formed as a tailgate, by means of a motor. See the broad interpretation of the concept of “flap” above.

  The flap 2 is normally used to close the flap opening 3. In this case, the spindle drive device 1 is arranged on the side of the flap opening 3, and in this embodiment, preferably on the rain garter 4 located on the side of the flap opening 3. Only one spindle drive 1 is shown in FIG. In this case, however, one spindle drive 1 is preferably arranged on each side of the flap opening 3. The two spindle driving devices 1 are substantially identical in structure.

  As shown in FIG. 1, one end of the spindle driving device 1 shown here is pivotally attached to a vehicle body 5 of the automobile, and the other end is pivotally attached to a flap 2. The spindle drive 1 preferably has a small length. This is obtained by the configuration of the spindle driving device 1 according to the present invention.

  The spindle driving device 1 has a motor driving device 6, and a spindle transmission device 7 is connected behind the motor driving device 6 in terms of driving technology. Furthermore, the spindle drive device 1 is provided with two drive connection portions 8 and 9, and these drive connection portions 8 and 9 serve to transmit the drive motion to the outside.

  The spindle transmission device 7 is formed as a spindle / spindle nut transmission device, engages with the spindle 10 that can be rotated by the motor drive device 6, and rotates relative to the spindle drive device 1 as a whole. It has an impossible spindle nut 11. Depending on the direction of rotation of the spindle 10, the spindle nut 11 moves in the axial direction in which the distance between the drive connection parts 8, 9 is reduced, and in the axial direction in which the distance between the drive connection parts 8, 9 increases. Exercise 13 is performed.

  The spindle 10 is provided with a spindle thread 10a as usual, and the spindle nut 11 is similarly provided with a spindle nut thread 11a as usual. Depending on the structural peripheral conditions, the spindle nut thread 11a can extend over only a part of the spindle nut 11 in the axial direction.

  The concepts “axial” and “radial” always relate to the geometric spindle axis 14 in this description.

  What is important here is that the spindle nut thread 11a extends beyond the spindle thread 10a at least at the position shown in FIG. Is surrounding at least a part of As a result, as shown in FIG. 2, a nested structure of the driving device 6 and the spindle nut 11 that achieves a particularly short configuration of the spindle driving device 1 is obtained.

  FIG. 2 further shows that the motor drive 6 is surrounded over its entire axial extension at the position where the spindle nut thread 11a is fully advanced. This provides the maximum component density along the geometric spindle axis 14. In any case, it is advantageous if the spindle nut thread 11a surrounds the motor drive 6 over more than half of its axial extension in the fully advanced position.

  2 and 3, it is important that the portion of the spindle nut thread 11a “beyond” the spindle thread 10a is more than 70% of the axial extension of the spindle nut thread 11a. It is important that there are many. This means that in the embodiment shown in FIGS. 2 and 3, all the thread segments of the spindle nut thread 11a required for the advance movement 13 are provided by this “over” part. . Therefore, in the embodiment shown in FIGS. 2 and 3, the possibilities for reducing the length of the spindle drive 1 are utilized to the maximum.

  In addition, the fact that the components here are arranged substantially concentrically is particularly advantageous in the spindle drive device 1 shown in FIGS. For example, the motor drive 6 has a drive motor 15 having a drive shaft (not shown) oriented concentrically with respect to the geometric spindle axis 14. Furthermore, the motor drive 6 has an intermediate transmission 16 connected behind the drive motor 15 in terms of drive technology, which intermediate transmission 16 in a particularly preferred configuration has a geometric spindle axis 14. Oriented concentrically. The intermediate transmission 16 is preferably formed as a torque conversion transmission.

  The concentric orientation of the intermediate transmission 16 with respect to the geometric spindle axis 14 is easily realized by forming the intermediate transmission 16 as a planetary gear transmission. The concentric orientation of the planetary gear transmission 16 with respect to the geometric spindle axis 14 is preferably such that the sun gear, planetary carrier and ring gear of the planetary gear transmission 16 correspond to the geometric spindle axis 14 accordingly. It means that it is oriented concentrically.

  According to the particularly preferred configuration shown in FIG. 4, in the configuration of the drive device 6 having the intermediate transmission device 16, the spindle nut thread 11 a is at the fully advanced position in the direction of the entry motion 12. And extends to the drive motor 15 at the maximum. In this embodiment, it is clear that the drive motor 15 is not surrounded by the spindle nut transmission 11. This can be particularly advantageous if, for example, the intermediate transmission 16 has a smaller cross-section than the drive motor 15, as shown in FIG. This will be explained in more detail.

  Due to the high packing density, the spindle 10 and the motor drive 6 are preferably arranged directly after one another along the geometric spindle axis 14.

  The illustrated structural configuration of the spindle drive 1 not only ensures a high robustness with respect to the release of the driving force, but also with a high robustness with respect to unfavorable peripheral conditions that may arise in some cases such as moisture, dust, etc. Guarantee. In this case, the spindle nut 11 is first formed in a tubular shape and has an inner diameter that is at least slightly larger than the corresponding extent of the portion of the motor drive device 6 that is surrounded by the spindle nut 11. The spindle 10 has a correspondingly large outer diameter in order to ensure engagement with the spindle nut 11.

  In the embodiment shown in FIGS. 2 and 3, the motor drive 6 has a tubular drive housing 17, and the spindle nut 11 slides with play on the drive housing during the entry movement. The fact is important. In order to bridge the play between the spindle nut 11 and the drive device housing 17, a preferably ring-shaped slide member 18 is provided which slides along the drive device housing 17. The slide member 18 has a sealing function and / or a bearing function. The slide member 18 is located at the axial end of the spindle nut 11. Preferably, the slide member 18 is an additional portion that is attached to the spindle nut 11 by bonding or clamping.

  For the embodiment described above, in which the spindle nut thread 11a surrounds only the intermediate transmission 16 and does not surround the drive motor 15, the drive housing 17 is preferably a first housing in which the intermediate transmission 16 is accommodated. One axial section 17 a and a second axial section 17 b that houses the drive motor 15. The first axial section 17a has a smaller cross section than the second axial section 17b, and the spindle nut thread 11a is at the second maximum at the position fully entered in the direction of the entry movement 12. Extends to section 17b. FIG. 4 shows that a particularly compact configuration is obtained with respect to the outer diameter of the spindle drive.

  Particularly preferably with respect to the functionality of the spindle drive 1, the spindle nut 11 is engaged with the motor drive 6, in this case preferably with the drive housing 17 of the motor drive 6 in a relatively non-rotatable manner. In order to realize that the relative rotation is impossible, the slide member 18 can be used by providing some form of shape connection between the slide member 18 and the drive device housing 17. In the simplest case, the drive housing 17 is provided with a groove oriented parallel to the geometric spindle axis 14 in which the web provided on the slide member 18 is engaged. To do. Alternative embodiments for non-rotatable configurations are also conceivable.

  It can be seen that the tubular spindle nut 11 has a substantially circular cross section. Therefore, in this case, the tubular drive housing 17 is preferably formed in a substantially circular shape with at least a predetermined section. The tubular spindle nut and / or the tubular drive housing 17 is in a particularly preferred configuration a thin plate part produced by deep drawing, in which case the spindle nut thread is injection-molded, for example by a plastic injection molding process. Can do.

  Both drive connecting portions 8 and 9 are provided with ball sockets 8a and 9a, respectively, and these ball sockets 8a and 9a are engaged with corresponding ball heads when the spindle driving device 1 is assembled. Both drive connections 8, 9 are coupled to caps 19, 20, respectively. In this case, one drive connection portion 8 is connected to the end portion of the spindle nut 11 via a cap 19. Such a connection can be made, for example, by clamping. The other drive connection 9 is connected to the motor drive 6 via a cap 20, in this case to the drive housing 17 of the motor drive 6. In this case as well, clamp coupling is performed.

  In order to assist the motor drive 6 in adjusting the flap 2, a spring device 21 is preferably provided that preloads both drive connections 8, 9 in opposite directions. In this case, it is advantageous if a preload is applied in a direction in which the drive connection parts 8, 9 are brought close to each other or in a direction away from each other, depending on the use example. In the preferred embodiment shown in FIGS. 2 and 3, the spring device 21 is formed as a coil spring device, preferably in this case as a compression coil spring device, in the direction in which the drive connections 8, 9 are separated from each other. Is pressed. All configurations relating to the compression coil spring device apply correspondingly to the tension coil spring device. The coil spring device 21 is oriented concentrically with respect to the geometric spindle axis 14 and surrounds the spindle nut 11. In this case, the coil spring device 21 preferably surrounds the spindle nut 11 with a predetermined play.

  In the embodiment shown in FIGS. 2 and 3, the compression coil spring device 21 has only one compression coil spring. However, it is conceivable that the compression coil spring device 21 has a plurality of compression coil springs that result in a very well defined spring characteristic tailored to the kinematics of the flap 2. In an alternative configuration with a tension coil spring device, at least one tension coil spring is provided, which can be twisted on both sides, on the caps 19, 20, etc. via approximately three spring coils on both sides. it can.

  More importantly, in the embodiment shown in FIGS. 2 and 3, the compression coil spring of the compression coil spring device 21 is a spring wire having a polygonal cross section, preferably a rectangular or square cross section. Is the fact that With such a configuration, the radial dimension with respect to the geometric spindle axis 14 can be further reduced.

  In the preferred embodiment shown in FIG. 4, a particularly compact spring device 21 support is provided. In this embodiment, the spring device 21 is in this case preferably supported by a stepped transition 17c between the first section 17a and the second section 17b of the drive housing 17. This support can be performed directly by the spring device 21 being directly engaged with the transition portion 17c. However, particularly preferably, as shown in FIG. 4, the spring device 21 and the transition part 17c are indirectly engaged via a spring guide tube 21a. With such a device, the spring device 21 can be attached to the spindle driving device 1 without substantially increasing the cross section of the spindle driving device 1.

  5 and 6 show another basic means for incorporating the spring device 21 into the spindle driving device 1 in a compact manner. In this case, the spring device 21, preferably formed as a coil spring device, is a compression coil spring device in a particularly preferred configuration and is also concentrically oriented with respect to the geometric spindle axis 14. In this case, what is important is the fact that the spring device 21 is surrounded by the spindle nut 11. The axial section of the spindle nut 11 surrounding the spring device 21 is preferably a section without the spindle nut thread 11a. In the embodiment shown in FIGS. 5 and 6, the spindle nut 11 is accommodated for accommodating the spring device 21 between the drive connecting portion 8 on the opposite side of the motor drive device 6 and the motor drive device 6. A space 11b is provided. As shown in FIGS. 5 and 6, the spring device 21 having almost any configuration can be accommodated by the accommodation space 11 b formed in this way. In the embodiment shown in FIGS. 5 and 6, the spring device 21 has two compression coil springs 21b and 21c, and these compression coil springs are arranged concentrically with each other. Further, in this case, preferably, a spring guide tube 21a for guiding the inner spring 21b is provided.

  In both embodiments shown in FIGS. 5 and 6, the spring device 21 is supported on the spindle 10 on the one hand and on the spindle nut 11 on the other hand. Therefore, during the adjustment operation of the spindle driving device 1, a relative movement as rotation about the spindle axis 14 occurs between the spring device 21 and the spindle 10. In order to avoid friction loss, in the embodiment shown in FIGS. 5 and 6, a bearing device 22 is provided between the spindle 10 and the spring device 21. In a very simple configuration, the bearing device consists of just two plates 22a, 22b forming a thrust slide bearing between the spindle 10 and the spring device 21.

  In the embodiment shown in FIG. 5, the accommodation space 11 b is used exclusively for accommodating the spring device 21. The accommodation space 11b does not affect the adjustment movement mechanism of the spindle driving device 1.

  In the embodiment shown in FIG. 6, the accommodation space 11 b is used to increase the adjustment distance of the spindle driving device 1. In this case, the spindle screw thread 10a preferably extends in the axial direction inside the receiving space 11b, and preferably the spindle screw thread 10a is connected to the motor drive device 6 when viewed from the motor drive device 6. Extends in the direction of the drive connection 8 on the opposite side. In a particularly preferred configuration, the spindle 10 is substantially pot-shaped, and the pot-shaped spindle 10 accommodates at least a part of the spring device 21.

  As described above, the spring guide tube 21a is provided inside the spindle nut 11, and the spring guide tube 21a is surrounded by the spring device 21, particularly the compression coil spring device 21b.

  In a particularly preferred configuration, at least one spindle drive 1 is arranged on the side of the flap opening 3, in this case preferably in the rain garter 4. The above description is also referred to regarding such a particularly preferable configuration.

  By means of another technique having an independent meaning, an automotive flap device comprising a flap 2 for closing the flap opening 3 and at least one spindle drive 1 described above arranged on the flap 2 is claimed. be written. Reference can be made to all descriptions of the spindle drive device 1 according to the invention.

Claims (39)

A spindle drive for a motor vehicle of the flap (2), a motor drive unit (6), connected to the spindle drive at the rear of the motor drive (6) and (7), the drive motion to the outside The spindle transmission device (7) has a spindle (10) rotatable by the motor drive device (6), and the spindle (10). A spindle nut (11) which is engaged and cannot be relatively rotated, and the spindle nut (11) is arranged between the drive connecting portions (8, 9) according to the rotation direction of the spindle (10). In the spindle driving device, an axial approach movement (12) that reduces the distance between the two drive connections (8, 9) and an axial advance movement (13) that increases the distance between the two drive connections (8, 9).
The thread (11a) of the spindle nut extends beyond the thread (10a) of the spindle, at least in a position where it has completely entered in the direction of the approach movement (12), and the motor drive (6) In order to assist the motor drive device (6) in adjusting the flap (2), preloading the drive connection portions (8, 9) in opposite directions to each other. A spindle driving device, characterized in that a spring device (21) is provided. The spindle nut thread (11a) is completely in entered position surrounds Ri preparative said motor driving apparatus (6) over more than half the extension in the axial direction, a spindle drive system according to claim 1, wherein. 3. Spindle drive according to claim 2, wherein the spindle nut thread (11a) surrounds the motor drive (6) over its entire axial extension in a fully advanced position. The spindle nut thread (11a) extends beyond the spindle thread (10a) in a fully advanced position over 70% of its axial extension in the direction of the approach movement (12). The spindle driving device according to any one of claims 1 to 3, wherein The motor drive device (6) has a drive motor (15) having a drive shaft which is oriented concentrically with respect to the geometric axis of the spindle (14), of claims 1-4 The spindle drive device according to any one of the above. The motor drive device (6), the intermediate gear has a (16), the spindle drive according to claim 5, which is connected to the rear of the drive motor (15). The spindle drive according to claim 6, wherein the intermediate transmission is formed as a torque conversion transmission. 8. Spindle drive according to claim 6 or 7, wherein the intermediate transmission (16) is formed as a planetary gear transmission. 9. Spindle drive according to claim 8, wherein the planetary gear transmission is oriented concentrically with respect to the geometric spindle axis (14). The spindle nut thread (11a) surrounds the intermediate transmission (16) and extends up to the drive motor (15) at a position fully entered in the direction of the approach movement (12). It is, spindle drive according to any one of claims 6 to 9. Wherein the spindle (10) and said motor drive unit (6) are arranged one behind directly phases along the geometrical axis of the spindle (14), according to claim 5, or, citing claim 5 spindle drive according to any one of claims 6 to 10. The spindle nut (11) is tubular and has an inner diameter that is at least slightly larger than the corresponding extent of the portion of the motor drive (6) that is surrounded by the spindle nut (11). has been that, a spindle driving device according to any one of claims 1 to 11. The motor drive (6) has a tubular drive housing (17), and the spindle nut (11) has play along the drive housing (17) during the entry movement (12). slides, the spindle drive according to any one of claims 1 to 12. 14. The spindle drive device according to claim 13, wherein the spindle nut (11) is provided with a slide member (18), and the slide member (18) slides along the drive device housing (17). The spindle driving device according to claim 14, wherein the spindle nut (11) is provided with the ring-shaped slide member (18). The spindle driving device according to claim 14 or 15, wherein the slide member (18) is located at an axial end of the spindle nut (11). The drive housing (17) has a first axial section (17a) and a second axial section (17b), the first axial section (17a) being the second axial section (17a). The spindle nut thread (11a) is the largest in the fully advanced position and the second axial direction of the drive housing (17). 17. Spindle drive according to any one of claims 13 to 16 , which extends to the section (17b). The transition (17c) from the first axial section (17a) to the second axial section (17b) is located in the transition area from the intermediate transmission (16) to the drive motor (15). 18. The spindle driving device according to claim 17, which is cited in claim 6. The spindle nut (11) is engaged with the rotation fixed manner the motor drive device (6), the spindle drive according to any one of claims 1 to 18. 20. Spindle drive device according to claim 19, wherein the spindle nut (11) is non-rotatably engaged with a drive device housing (17) of the motor drive device (6). One drive connection (8), said be connected to the end of the spindle nut (11), the other drive connection (9) is connected to the motor drive unit (6), wherein both 20. The drive connection (8, 9) is located on the geometric spindle axis (14) , or claim 6 or any one of claims 6 to 19 quoting claim 5. Spindle drive device. 22. Spindle drive device according to claim 21, wherein the other drive connection (9) is connected to a drive device housing (17) of the motor drive device (6). The spring device (21) have been made form as a coil spring devices, the coil spring device have oriented concentrically with respect to the geometric axis of the spindle (14), the spindle nut (11) surrounding the has claim 5, or the spindle drive of any one of claims 6 to cite claims 5 to 22. 24. Spindle drive according to claim 23, wherein the spring device (21) is formed as a compression coil spring device. The coil spring device (21) has at least one helical compression spring having a field ne wire cross-section of polygonal shape, spindle drive according to claim 23 or 24, wherein. 26. Spindle drive according to claim 25, wherein the coil spring device (21) comprises at least one compression coil spring with a spring wire of rectangular or square cross section. The spring device (21) is supported by the front Symbol transition between the driving device of the first axial section of the housing (17) (17a) and said second axial segment (17b) (17c) It is, claim 18, or, spindle drive according to any one of claims 23 to cite claims 18 to 26. 28. The spindle driving device according to claim 27, wherein the spring device (21) is supported by the stepped transition part (17c). The spring device (21) have been made form as a coil spring devices, the coil spring device have oriented concentrically with respect to the geometric axis of the spindle (14), the spindle nut (11) that it is surrounded by any one of claims 23 to 26, or, spindle drive according to claim 27 or 28, wherein cite claim 23 or 24. 30. Spindle drive according to claim 29, wherein the spring device (21) is formed as a compression coil spring device. The spindle nut (11) accommodates the spring device (21) between the drive connecting portion (8) opposite to the motor drive device (6) and the motor drive device (6). 31. The spindle driving device according to claim 29 or 30, wherein the spindle driving device has a receiving space (11b). 27. The spring device (21) is supported on the spindle (10) on the one hand and on the spindle nut (11) on the other hand, according to any one of claims 23 to 26, or 23 or 24. 32. The spindle driving device according to claim 27 or 28, or 29 to 31 . The spindle screw thread (10a) extends in the axial direction inside the receiving space (11b), according to claim 31, or spindle drive according to claim 32 wherein the cited claim 31. 34. Spindle drive device according to claim 33, wherein the spindle (10) is substantially pot-shaped and the pot-shaped spindle (10) houses at least part of the spring device (21). . Wherein the inside of the spindle nut (11) a spring guide tube (21a) is provided, the spring guide tube (21a) is surrounded by the spring device (21), any of claims 23 to 26 Or claim 27 or 28 citing claim 23 or 24, or any one of claims 29 to 31, or claim 32 or claim 23 or 24 35. A spindle driving apparatus according to claim 33 or 34 . The vehicle flap device, the flap (2) for closing the flap opening (3), disposed on the flap (2), according to any one of claims 1 to 35 at least one spindle A flap device for an automobile, characterized in that it has a drive device (1). Wherein the at least one spindle drive (1), the has been placed on the side of the flap opening (3), the flap apparatus according to claim 36, wherein. 38. A flap device according to claim 37, wherein the at least one spindle drive (1) is arranged on a rain garter (4). 39. Flap device according to claim 37 or 38, wherein there are two spindle drives (1) arranged on opposite sides of the flap opening (3).

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