EP0064763A2 - Drive, in particular an adjusting drive in a motor vehicle - Google Patents

Abstract

In the case of an adjusting drive (10) for motor vehicles with a rotatably mounted drive member (16), a rotatably mounted output member (26) coaxial with the drive member and a wrap spring () which is supported against the inner circumferential surface (76) of a hollow cylindrical element (18) coaxial with the members. 22) one of the links (26) is connected in a rotationally fixed manner to a first claw part (drive disks 28) which, with a corresponding mutual rotation of the wrap spring (22) and claw part, is connected to one of the inwardly bent ends (72) of the wrap spring (22) in the sense of a Expansion of the wrap spring (22) presses. In order to connect the drive member (16) to the driven member (26) in a rotationally fixed manner via an easily releasable, particularly simply constructed coupling, it is proposed that the other member (16) be connected in a rotationally fixed manner to the hollow cylinder element (18).

Description

The invention relates to a drive, in particular an adjustment drive for motor vehicles, with a rotatably mounted drive member, a rotatably mounted output member which is coaxial with the drive member and a wrap spring which is supported against the inner circumferential surface of a hollow cylindrical element which is coaxial with the members, one of the members being non-rotatably connected to a first claw part is connected, which presses against one of the possibly inwardly bent ends of the wrap spring in the sense of widening of the wrap spring when the wrap spring and claw part are rotated accordingly.

A drive of this type is known (for example DE-OS 25 24 583 and DE-PS 487 155). Here, the hollow cylindrical element as part of a drive housing is stationary and is used in conjunction with the wrap spring and on both links brought claw parts as a wrap spring brake for a motor vehicle window regulator. The two links are coupled via the interlocking claw parts.

The object of the invention is to provide a drive of the type mentioned at the outset, in which the drive and driven member are connected to one another in a rotationally fixed manner via an easily releasable, particularly simply constructed coupling.

This object is achieved in that the other link is rotatably connected to the hollow cylinder element. If the two links are rotated against each other in such a way that the first claw part presses against the wrap spring in the sense of widening, this leads to the wrap spring being pressed against the inner circumferential surface with a radial force which increases with the torque acting between the links. Accordingly, one obtains a reliable rotational coupling of the links with a mutual twisting in the specified sense. It does not matter whether the hollow cylinder is connected to the drive element or to the output element in a rotationally fixed manner. The rotary coupling between the two links is achieved in that the wrap spring is moved away from its non-positive pressure position on the inner peripheral surface. This can be achieved, for example, by pressing on one of the wrap spring ends in the sense of a diameter reduction of the wrap spring, ie pulling on the wrap spring at this end in the circumferential direction. If this is done with the aid of the first claw part, which then presses on one end of the wrap spring in the one direction of rotation in the sense of widening and in the other direction of rotation in the sense of a diameter reduction of the wrap spring, an extremely simply constructed freewheel is obtained. In this case, the other wrap spring end is not reversed arc.

In a preferred embodiment, a separate, rotatably mounted, with the links coaxial disengagement element is provided, which is formed with a second claw part, which presses with a corresponding mutual rotation of the wrap spring and the second claw part at one of the ends of the wrap spring in the sense of a diameter reduction of the wrap spring . In this case, the rotational coupling between the links, which is also effective in both directions of rotation, can be released in a simple manner by corresponding actuation of the decoupling element.

A further preferred embodiment of the invention is characterized in that the preferably electric motor-driven drive member is connected in a rotationally fixed manner to the hollow cylinder element, in that the first claw part, which is connected in a rotationally fixed manner to the output member, is depending on the rotational position at one or the other end of the wrap spring in each case in the sense of an expansion of the wrap spring presses that the second claw part presses on one or the other end of the wrap spring in the sense of a diameter reduction of the wrap spring depending on the rotational position and that the decoupling element can be connected to an auxiliary drive (preferably a manual drive). These measures result in a compact, always effective manual override. In the event of a failure of the drive motor driving the drive member, the output member can be rotated in the desired manner in both directions of rotation by appropriate rotation of the decoupling element, the rotary coupling between the drive member possibly blocked by the stationary electric motor and the output member being released. As with the known drives mentioned at the outset, the drive element is carried along by the disengaging element in that the second Presses claw part against the first claw part via a wrap spring end and takes it with it. After the defect on the drive member has been eliminated, the drive according to the invention is immediately ready for operation again, with only the auxiliary drive, for example a hand crank, possibly being separated from the decoupling element. The entire arrangement is compact because the decoupling element is mounted coaxially to the links.

In a known manual override (DE-OS 27 05 627), on the other hand, the drive connection between the electric motor and the drive must be loosened in the event of a malfunction and restored after the defect has been eliminated, for example by disengaging a drive shaft from a driving position in which the drive shaft has a Plug connection with a coaxial connecting shaft is rotatably connected. The known manual override also requires more installation space, since its components are not arranged coaxially, as in the case of the invention, but on two axially parallel, spaced axes.

In a preferred embodiment, the disengaging element can be connected to the auxiliary drive via a plug-in coupling; such a coupling is easy to operate and requires little installation space, especially if the decoupling element is provided with an internal polygon for a manual control element.

In order to prevent the transmission of vibrations and / or impacts, for example stop impacts, between the drive member and the output member and thereby to reduce noise and mechanical wear, it is proposed that the drive element be axially forward on an end face perpendicular to its axis of rotation standing, distributed on a circumferential line, between which engages correspondingly formed on the hollow cylindrical element webs, wherein in the circumferential direction between the webs each have a spring element, preferably a rubber element.

A particularly compact arrangement in the axial direction is obtained in that a bearing collar for the rotary mounting of the hollow cylinder element or of the drive element is formed on the drive element or on the hollow cylinder element.

Characterized in that the hollow cylinder element, as proposed, is provided with a metallic insert sleeve having the inner peripheral surface, low-wear operation and a consistently high coefficient of friction between the wrap spring and the inner peripheral surface are achieved. The hollow cylinder element itself can be manufactured inexpensively from less wear-resistant material, for example from plastic.

In a preferred embodiment, the first claw part is formed in the region of the two ends of the wrap spring with a flat, preferably approximately dovetail-shaped driver, which is attached to an output shaft and is perpendicular to the axis of rotation of the links and projects radially beyond the inside wrap spring diameter. In this way, on the one hand, reliable contact is achieved between the inwardly bent two ends of the wrap spring and the first claw part, and, on the other hand, secure guidance of the wrap spring windings between the two drivers which project radially outward beyond the wrap spring inner diameter.

To reduce the manufacturing costs, the two drivers can be congruent and / or in one piece with the An drive shaft be formed.

Due to its compact and robust construction and the possibility of providing an always effective manual override, the drive according to the invention is particularly suitable as a drive for a motor vehicle window regulator. For this purpose, it is proposed that the output member is connected in a rotationally fixed manner to a pinion which meshes with a threaded cable of a cable window lifter or a toothed segment of a rod window lifter. However, the output member can alternatively also be connected in a rotationally fixed manner to a cable drum for the cable of a cable window lifter.

In a mechanically stable and yet easy to manufacture embodiment, the disengaging element is formed with a partial hollow cylinder which forms the second claw part and is arranged between the wrap spring and the output shaft passing through the wrap spring, the axially extending edges of which cooperate with the radially inwardly bent ends of the wrap spring.

A simple mounting of the decoupling element, which in turn requires only little installation space in the axial direction, is formed in such a way that the decoupling element is rotatably mounted in a bearing opening of a drive housing with an axial bearing bolt which may be formed with the internal polygon. To increase the endurance strength can always be ^p stored el- element additionally entraining Auskup namely on the first claw part by means of a bearing on the periphery of one of the carrier with the members in normal operation, on the drive shaft mounted drive plate adjacent Federal.

• _Fig. 1 eine Schnittansicht des erfindungsgemäßen Antriebs im Schnitt entlang der Linie I-I in Fig. 2 und 3;
• Fig. 2 eine Schnittansicht der Anordnung nach Fig. 1 im Schnitt entlang der Linie II-II; und
• Fig. 3 eine Schnittansicht eines Einzelteils der Anordnung nach Fig. 1 im Schnitt entlang der Linie III-III.

The invention is illustrated below in one embodiment game explained using the drawing. It shows:

• _F ig. 1 shows a sectional view of the drive according to the invention in a section along the line II in FIGS. 2 and 3;
• Fig. 2 is a sectional view of the arrangement of Figure 1 in section along the line II-II. and
• Fig. 3 is a sectional view of an individual part of the arrangement of FIG. 1 in section along the line III-III.

The drive shown in FIGS. 1 and 2, generally designated 10, establishes the connection between an electric drive motor, not shown, on the motor shaft of which a worm 12 shown on the right in FIG. 1 is fastened and a threaded cable window lifter in a motor vehicle, the threaded cable 14 in Fig. 1 is drawn lower left. The frictional connection between worm 12 and threaded cable 14 runs in sequence over the following coaxially mounted rotating parts: a drive member 16 in the form of a worm wheel meshing with the worm 12, a hollow cylindrical element -18, which couples torsionally vibration-damped to the drive member 16 and via a damping rubber part 20 a wrap spring 22, which is supported on the inner circumference of an insert sleeve 24 inserted into the hollow cylindrical element 18, and an output member 26, the upper end of which in FIG. 1 is provided with two drive disks 28, which form a first claw part and interact with the wrap spring 22, and at the lower end of which a pinion 30 engaging in the threaded cable 14 is pushed in a rotationally fixed manner. A further rotary member upwardly subsequent Auskuppelelement 32, is located on the driven member 26 is not in raftweg _K between the screw thread 12 and cable 14; it turns le during normal operation diglich with. As will be described in more detail, the disengaging element 32 serves to enable manual operation of the window lifter in the event of a malfunction, for example in the case of a defective drive motor.

The rotary parts 16 to 32 described above are mounted in a two-part housing with a lower housing base 34 in FIG. 1, a housing cover 36 with an intermediate sealing ring 38 and a cover 40 attached to the underside of the housing base 34, which serves as a guide for the threaded cable 14 and covers the threaded cable 14 and the pinion 30 against contamination downwards. The housing can be made of plastic or metal.

The vibration-damped, rotationally fixed connection between the drive member 16 and the hollow cylinder element 18 is illustrated in FIG. 3. . In the section of Figure 3 are merely the hollow cylindrical member 18 and the Dämpfun ^g s-rubber member 20 shown in section; the drive member 16, however, is omitted. It can be seen that the hollow cylinder element 18 is formed with a bearing disc 44 perpendicular to the axis of rotation 42 in FIG. 1, from which a hollow cylinder section 46 adjoins upwards in FIG. 1 (indicated by dotted lines in FIG. 3) in the, as already mentioned , the insert sleeve 24 is inserted. The bearing disc 44 is formed with a central bearing opening 48 with which the hollow cylinder element 18 is rotatably mounted on a correspondingly dimensioned bearing collar 50 of the drive element 16. To increase the Drehla Surface Terminal ^g in the axial direction and thus for increasing the tipping stability is still a projecting downwards, the bearing collar 50 engages around neck bearing 52 is formed, as in Fig. 3 can be seen on the bearing disc 44.

From this neck 52 go three in the radial direction webs 54 distributed on the circumference of the bearing disc 44, each of which ends shortly before the outer circumference of the bearing disc 44 is reached. As shown in FIG. 1, the webs 54 project downward in the axial direction. The drive member 16 is also formed in a corresponding manner with three webs 56, the. Axis of rotation 42 parallel side surfaces 58 in FIG. 3 are indicated with dash-dot lines. The webs 56 each lie at half an angle between the webs 54, with a space remaining between these webs 54 and 56 in the circumferential direction, which is fully filled by a correspondingly shaped section 60 of the damping rubber part 20. As shown in FIG. 1, successive sections 60 are connected to one another in each case by a correspondingly thinner connecting section 62. The damping rubber part 20 is therefore in one piece and thus inexpensive to manufacture and assemble. The hollow cylinder element 18 is thus rotatably mounted on the drive member 16 via the bearing collar 50 and the bearing neck 52, but ^g e-ring torsional vibrations which are cushioned and damped by the sections 60 are possible in both directions from the rest position shown in FIG. 3. The drive member 16 is in turn rotatably mounted on the one hand in a corresponding downwardly open bearing opening 34 i bearing neck 66 and on the other hand on a cylindrical output shaft 68 of the output member 26 which passes through a bearing opening 70 of the bearing neck 50.

The shape of the wrap spring 22 inserted into the insert sleeve 24 can be seen from FIGS. 1 and 2. Accordingly, the wrap spring 22 is wound in the manner of a solenoid, with both ends, the upper visible end 72 in FIG. 1 and that only in FIG. 2 recognizable lower ends 74 are bent radially inwards. The outer diameter of the relaxed wrap spring 22 is slightly larger than the In diameter of the insert sleeve 24, so that the wrap spring 22 inserted into the insert sleeve 24 presses radially outward against the inner peripheral surface 76 of the insert sleeve 24.

With the ends 72 and 74 of the wrap spring 22, the driving disks 28 interact in accordance with the respective rotational position, specifically the driving disk in FIG. 1 with the upper end 72 and the lower driving disk 28 with the lower end 74. For this purpose, the two driving disks 28 are each formed with an approximately dovetail-shaped driver 78 which, as shown in FIG. 2, extends to the inner circumferential surface 76 of the insert sleeve 24. In this way, it is achieved that the ends 72 and 74 are not bent over by the corresponding drivers 78 even at high torques, since the drivers 78 with their outer corners directly apply the corresponding torque to the ends 72 and 74 in each of the bent ends Transfer circumferential wrap spring section. It is also advantageous that the two catches 78 prevent the windings of the wrap spring 22 lying between them from moving axially upwards or downwards. As can be seen from FIG. 1, the two drive disks 28 are pushed onto both sides of a collar 80 of enlarged diameter of the output shaft 68 and are soldered or welded there. However, other types of connection are also possible, and the drive plates can also be formed in one piece with the output shaft.

At the lower end of the output shaft 68, the pinion 30 is non-positively pushed onto a reduced-diameter, corrugated section 82.

The disengaging element 32 consists of a circular disk 84 perpendicular to the common axis of rotation 42, from which an axial bearing pin 86 projects upwards in FIG central polygonal socket 88 is provided for receiving a corresponding external polygon of a Hilfsbetätigun not shown sschlüssels ^g. The bearing pin 86 is rotatably mounted in a corresponding bearing opening 90 in the housing cover 36. A partial hollow cylinder 92, whose cylinder axis coincides with the axis of rotation 42, extends downward from the circular disk 84. As can be seen in FIG. 1, the partial hollow cylinder 92 almost reaches in the axial direction up to the bearing disk 44 of the drive member 16. The cross section of the partial hollow cylinder 92 shown in FIG. 2 corresponds to a circular ring from which a sector has been cut out. The edges of the partial hollow cylinder 92, which run in the axial and radial directions, are designated by 94 in the figures. As can be seen from Fig. 2, these edges 94 cooperate with the corresponding ends 72 and 74 of the wrap spring 22 depending on the direction of rotation, as will be explained in more detail.

1 also shows a collar 96, which is formed at the upper axial end of the partial hollow cylinder 92 and protrudes slightly radially inwards and rests on the outer circumference of the drive plate 28 and in this way provides for an additional rotary bearing of the decoupling element 32, specifically on the output member 26.

The mode of operation of the drive described above will be explained below. In normal operation, ie when a power window operation by the not shown electric drive motor via associated with this worm 12, the frictional connection runs as set forth in the introduction, over the rotating members 16 to 30 to _G e-threaded cable 14. Thereby, the hollow cylinder member 18 via the coil spring 22 non-rotatably coupled to the output member 26 regardless of the direction of rotation. Namely, when the drive motor is running via the worm 12, the drive member 16 and the Dämpfun ^g sgummiteil 20, the hollow cylindrical element 18, for example, rotated in a clockwise direction (arrow A), thus arrives after a short rotation, the end 72 to bear against the not yet stationary carrier 78. In a further rotation in direction A from the carrier 78 exerted on the wrap spring 22 in the longitudinal direction of a force corresponding to the acting torque, which the spring 22 attempts to expand, which leads to the spring 22 being pressed against the inner peripheral surface 76 with increasing force. The result is a reliable frictional engagement between wrap spring 22 and insert sleeve 24, wherein the frictional force increases with the torque applied.

Relieving elements 18 ^y also upon rotation of the Hohlz in the opposite direction of rotation A rotation direction is a driving of the driven element 26, wherein the wrap spring 22 cooperates in this case, the lower in Fig. 1 the end 74 with the lower engagement 78th In both cases, the disengaging element 32 is only rotated.

If there is a defect in the drive motor, the window lifter can still be operated by hand immediately by bringing in the manual override key already mentioned with the vehicle tool kit and inserting it with its polygonal socket into the polygonal socket 88. When the key is rotated, for example in direction B, the partial hollow cylinder 92 accordingly also rotates in this direction (see FIG. 2). After a short rotation, the edge 94 lying further down in FIG. 2 comes to bear against the upper end 72 of the wrap spring 22. When the winder spring 22 is turned further, the edge 94 pulls on the wrap spring 22 in its longitudinal direction, which causes the wrap spring 22 to lift off from the inner peripheral surface 76 and thus a loosening of the frictional engagement between wrap spring 22 and hollow cylinder element 18 results. With a further rotation of the disengaging element 32, the entrained upper end 72 comes to rest against the entrainer 78, which is also entrained during the further rotational movement. The output member 26 is thus rotationally coupled to the disengaging element 32. In contrast, the rotary coupling between the drive member 16 and the output member 26 is released, since the wrap spring 22 is no longer in frictional engagement with the hollow cylinder element 18. The adjustment movement of the window lifter with the aid of the disengaging element 32 is therefore not impeded by a possibly blocking electric drive motor.

Due to the symmetry of the arrangement, the window lifter can of course also be actuated in the opposite direction without any problems, in which case the partial hollow cylinder 92 with its upper edge 94 in FIG. 2 via the lower end 74 of the wrap spring 22 in FIG. 1 to the lower driver 78 presses. In both cases, the window can be quickly adjusted using the key, since the key acts directly on the output member 16 and the pinion 30 connected to it without large intermediate translation.

After the defect in the drive motor has been remedied, the drive 10 is immediately ready for operation again; you only have to remove the key.

Claims (16)

1. Drive, in particular adjusting drive for motor vehicles, with a rotatably mounted drive member, a rotatably mounted, with the drive member coaxial output member and against the inner circumferential surface of a coaxial hollow cylinder element supported with the links, one of the links being rotatably connected to a first claw part that with appropriate mutual rotation of Schlin spring ^g- and-mouth part of one of the possibly inwardly bent ends of the wrap spring presses in the sense of expansion of the wrap spring, characterized in that the other member (16) rotatably connected to the hollow cylinder element (18) is. 2. Drive according to claim 1, characterized by a rotatably mounted at one, with the limbs (16, 26) coaxial Auskuppelelement (32) formed second warm part _K, which second at a corresponding mutually _en rotation of the wrap spring (22) and Claw part presses on one of the ends (72, 74) of the wrap spring (22) in the sense of reducing the diameter of the wrap spring (22). 3. Drive according to claim 2, characterized in that the preferably electric motor-driven drive member (16) with the hollow cylindrical element (18) is rotatably connected, that with the output member (26) rotatably connected first claw part depending on the rotational position to one or the other End (72,74) of the wrap spring (22) in each case in the sense of an expansion of the wrap spring (22) presses that the second claw part depending on the rotational position to one or the other end (72,74) of the wrap spring (22) in each case in the sense a reduction in diameter of the wrap spring (22) and that the decoupling element (32) can be connected to an auxiliary drive, preferably a manual drive. 4. Drive according to claim 3, characterized in that the disengaging element (32) can be connected to the auxiliary drive via a plug-in coupling. 5. Drive according to claim 4, characterized in that the decoupling element (32) is provided with an internal polygon (88) for a manual actuator. 6. Drive according to one of claims 1 to 5, characterized in that the drive element (16) is formed on an end face perpendicular to its axis of rotation (42) with axially projecting webs (56) distributed on a circumferential line, between which on the hollow cylindrical element (18 ) engage appropriately designed webs (54), an intermediate space having a spring element, preferably a damping rubber part (20), being formed in the circumferential direction between the webs (54, 56). 7. Drive according to one of claims 1 to 6, characterized in that on the drive member (16) or on the hollow cylinder element, a bearing collar (50) for rotary mounting of the hollow cylinder element (18) or the drive element is formed. 8. Drive according to one of claims 1 to 7, characterized in that the hollow cylindrical element (18) with an inner peripheral surface (76) having a metallic insert sleeve (24) is provided. 9. Drive according to one of claims 1 to 8, characterized in that the first claw part in the region of the two ends (72, 74) of the wrap spring (22) each with a flat, on an output shaft (68) attached to the axis of rotation (42 ) of the links (16, 26) is formed vertically, radially projecting over the wrap spring inner diameter driver (78), which is preferably approximately dovetail-shaped. 10. Drive according to claim 9, characterized in that the two drivers (78) are congruent. 11. Drive according to claim 9 or 10, characterized gekennzeich- - that the two drivers are integrally formed with the output shaft. 12. Drive according to one of claims 1 to 11, characterized in that the output member (26) is rotatably connected to a pinion (30) which meshes with a threaded cable (14) of a cable window lifter or a toothed segment of a rod window lifter. 13. Drive according to one of claims 1 to 11, characterized in that the output member rotatably with a Cable drum for the cable of a cable window lifter is connected. 14. Drive according to one of claims 3 to 13, characterized in that the decoupling element (32) with a second claw part, between the wrap spring (12) and one or the wrap spring (12) passing through output shaft (68) arranged partial hollow cylinder (92) is formed, the edges (94) of which extend in the axial direction interact with the radially inwardly bent ends (7 ₂ , ₇₄ ) of the wrap spring (12). 15. Drive according to one of claims 3 to 14, characterized in that the Auskup ^p elelement (32) with a possibly with the inner polygon (88) formed axial bearing pin (86) is rotatably mounted in a Laaer opening ( ₉₀ ) of the drive housing. 16. Drive according to claim 15, characterized in that the decoupling element (32) is mounted on the first claw part by means of a collar (96) attached to the periphery of one of the drivers (78) carrying on the output shaft (68) attached drive plate (28).

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