Drive assembly for a window lifter having a stop ring for a cable drum

Abstract

A power window actuator includes a carrier element having an opening, a cable drum includes a portion is inserted into the opening of the carrier element in such a manner that the portion at least partially extends through the opening, and a cable exit housing disposed on a first side of the carrier element includes a bearing element supporting the cable drum on the first side of the carrier element so as to be rotatable about a rotation axis. At least one bearing element projects radially with respect to the rotation axis from the portion, the bearing element engaging a counter bearing on a periphery of the carrier element surrounding the opening of the carrier element.

Claims

1. A drive device for an adjustment apparatus for adjusting a vehicle part, comprising a carrier element defining an opening; a cable drum including a portion inserted into the opening of the carrier element in such a manner that the portion at least partially extends through the opening; a cable exit housing disposed on a first side of the carrier element and including a first bearing element disposed on the first side of the carrier element and the first bearing element supporting the cable drum, the cable drum being rotatable about a rotational axis; a drive wheel drivable by a motor unit; and a drive housing disposed on a second side of the carrier element facing away from the first side, the drive housing including a second bearing element supporting the drive wheel, the drive wheel being rotatable about the rotational axis; wherein the cable drum includes a plurality of support elements projecting from the portion such that the support elements are oriented radially relative to the rotational axis, the support elements extending radially across a counter section of the carrier element which comprises a peripheral edge of the carrier element surrounding the opening of the carrier element; wherein the plurality of support elements are configured to be supported on the counter section such that the counter section blocks a movement of the cable drum through the opening of the carrier element; wherein the portion of the cable drum includes a ring gear connecting the cable drum to the drive wheel such the cable drum and the drive wheel are rotationally fixed.

2. The drive device as claimed in claim 1, wherein the counter section is formed by a support ring that surrounds the opening of the carrier element.

3. The drive device as claimed in claim 1, wherein the cable exit housing is connected to the carrier element by a latch-fit connection.

4. The drive device as claimed in claim 1, wherein the cable exit housing has at least one housing portion that is radially spaced apart from the rotational axis and that is fixed on the carrier element such that the cable exit housing is held on the carrier element to be rotationally fixed in relation to the rotational axis.

5. The drive device as claimed in claim 4, wherein the housing portion includes a base portion that is attached to the carrier element, wherein one of the base portion or the carrier element includes a positive-lock element and the other of the base portion or the carrier element includes a positive-lock opening, the positive-lock element engaging with the positive-lock opening.

6. The drive device as claimed in claim 5, wherein the positive-lock element engages in a latching manner in the positive-lock opening.

7. The drive device as claimed in claim 1, wherein the cable exit housing and the drive housing are fastened to one another by a fastening element that acts between the first bearing element and the second bearing element.

8. The drive device as claimed in claim 7, wherein the fastening element is a screw element connecting the cable exit housing and the drive housing along the rotational axis.

9. The drive device as claimed in claim 1, wherein the drive housing has at least one fastening device that is radially spaced apart from the second bearing element, the fastening device fixing the drive housing on the carrier element such that the drive housing is held on the carrier element so as to be rotationally fixed in relation to the rotational axis.

10. The drive device as claimed in claim 9, wherein one of the carrier element and the fastening device includes a positive-lock element and the other of the carrier element and the fastening device includes a positive-lock opening, the positive-lock element engaging with the positive-lock opening.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The concept on which the solution is based is to be explained in more detail hereunder by means of the exemplary embodiments illustrated in the figures.

(2) FIG. 1A shows an exploded view of an exemplary embodiment of a drive device.

(3) FIG. 1B shows the exploded view according to FIG. 1A from a different perspective.

(4) FIG. 2 shows a view of a cable exit housing before being attached to a carrier element.

(5) FIG. 3 shows another view of the cable exit housing before being attached to the carrier element.

(6) FIG. 4A shows a view of the cable exit housing on the carrier element.

(7) FIG. 4B shows a view enlarged in fragments of the assembly according to FIG. 4A.

(8) FIG. 5 shows a separate view of the cable exit housing seen from obliquely below.

(9) FIG. 6 shows a plan view of the cable exit housing.

(10) FIG. 7 shows a cross-sectional view along the line 7-7 according to FIG. 6.

(11) FIG. 8 shows the cross-sectional view according to FIG. 7, with the cable exit housing attached to the carrier element.

(12) FIG. 9 shows a cross-sectional view along the line 9-9 according to FIG. 4A, before the bracing of the cable exit housing with a drive housing by way of a fastening element.

(13) FIG. 10 shows a schematic view of an adjustment installation of a vehicle in the form of a power window actuator.

DETAILED DESCRIPTION

(14) Such a drive device has generally to be designed so as to make available a torque of sufficient strength in order for the window glass to be adjusted. The drive device herein is to be able to have a small installation space, is to be easily assembled for example on an assigned carrier element, for example the apparatus carrier of a door module, and when in operation is to have a favorable operational behavior together with a low generation of noise, for example on a door module of a vehicle door.

(15) In the case of a drive for an adjustment installation in a motor vehicle, known from DE 10 2004 044 863 A1, a cable drum is disposed on a bearing mandrel of a drive housing, wherein the drive housing by way of a fastening element in the form of a screw is connected to a carrier element in the form of an apparatus carrier.

(16) FIGS. 1A, 1B to 9 show an exemplary embodiment of a drive device 1 which can be used, for example, as a drive in an adjustment installation for adjusting a window glass, for example of a side door of a vehicle.

(17) Such an adjustment installation in the form of a power window actuator, illustrated in an exemplary manner in FIG. 10, has a pair of guide rails 11, for example, on which one entrainment element 12 which is coupled to a window glass 13 is in each case adjustable. Each entrainment element 12 is coupled to a drive device 1 by way of a traction cable 10 which is configured for transmitting (exclusively) tensile forces, wherein the traction cable 10 configures a closed cable loop and to this end, by way of the ends of said traction cable 10, is connected to a cable drum 3 (cf. FIGS. 1A and 1B, for example) of the drive device 1. The traction cable 10 extends from the drive device 1 around deflection rollers 110 on the lower ends of the guide rails 11 to the entrainment elements 12, and from the entrainment elements 12 around deflection rollers 111 at the upper ends of the guide rails 11 back to the drive device 10.

(18) When in operation, a motor unit of the drive device 1 drives the cable drum 3 in such a manner that the traction cable 10 by way of one end is wound onto the cable drum 3, and by way of the other end is unwound from the cable drum 3. On account thereof, the cable loop formed by the traction cable 10 is displaced without any change in the freely extended cable length, this leading to the entrainment elements 12 being moved in the same direction on the guide rails 11 and the window glass 13, on account thereof, being adjusted along the guide rails 11.

(19) The power window actuator in the case of the exemplary embodiment according to FIG. 10 is disposed on an apparatus carrier 4 of a door module. The apparatus carrier 4 can, for example, be established on an internal door panel of a vehicle door and represents a pre-assembled unit which, in the pre-assembled state having the power window actuator disposed on the apparatus carrier 4, can be assembled on the vehicle door.

(20) The drive device 1 of the exemplary embodiment according to FIGS. 1A, 1B to 9 is disposed on an area portion 40 of a carrier element 4 which is implemented, for example, by an apparatus carrier and has a cable exit housing 2 disposed on a first side of the carrier element 4, and a drive housing 7 disposed on a second side of the carrier element 4, said second side facing away from the first side. The cable exit housing 2 serves for mounting the cable drum 3 on the carrier element 4, while the drive housing 7 encloses inter alia a drive wheel 6 which can be driven by way of a motor unit 8 and is connected to the cable drum 3 such that the cable drum 3 can be driven by rotating the drive wheel 6.

(21) The cable drum 3 on the first side of the carrier element 4, when disposed according to the intended use on a vehicle door of a vehicle, for example, is disposed in a wet space of the vehicle door. By contrast, the drive housing 7 is located in the dry space of the vehicle door. The separation between the wet space and the dry space is established by way of the carrier element 4, and the interface between the drive wheel 6 and the cable drum 3 is accordingly to be sealed in a moisture-proof manner such that no moisture make its way from the wet space to the dry space.

(22) The cable exit housing 2 has a base 20, a cylindrical bearing element 22 in the form of a bearing dome that projects centrally from the base 20, and housing portions 21 in the form of housing webs which extend so as to be parallel to the cylindrical bearing element 22 and are radially spaced apart from the bearing element 22. The cable drum 3 is rotatably mounted on the bearing element 22 and herein is enclosed by the cable exit housing 2 in such a manner that the cable drum 3 is held on the carrier element 4.

(23) The cable drum 3 has a body 30 and, on the circumferential shell face of the body 30, has a cable channel 300 for receiving the traction cable 10, said cable channel 300 being molded in the body 30. The cable drum 3 by way of a ring gear 31 is inserted in an opening 41 of the carrier element 4 and is connected in a rotationally fixed manner to the drive wheel 6 such that a rotating movement of the drive wheel 6 leads to a rotating movement of the cable drum 3.

(24) The drive housing 7 by way of an interposed sealing element 5 is attached to the other, second side of the carrier element 4 and has a housing case 70 having a bearing element 72 in the form of a cylindrical bearing dome which is configured centrally in said housing case 70 and which engages through an opening 62 of the drive wheel 6 and which in this way rotatably mounts the drive wheel 6. A worm housing 74 adjoins the housing case 70, a drive worm 81 which is connected in a rotationally fixed manner to a drive shaft 800 of an electric motor 80 of the motor unit 8 lying in said worm housing 74 and by way of a worm toothing meshing with an external toothing 600 of a body 60 of the drive wheel 6. The drive shaft 800, at the end thereof that faces away from the electric motor 80, by way of a bearing 82 is mounted in the worm housing 74. The electric motor 80 herein lies in a motor case 73 of the drive housing 7, said motor case 73 by way of a housing cover 75 being closed in relation to the outside.

(25) The drive housing 7 moreover has an electronics housing 76 in which a circuit board 760 having control electronics disposed thereon is enclosed. The electronics housing 76 is closed in relation to the outside by way of a housing plate 761 having a plug connector 762 for the electrical connection of the electronics of the circuit board 760 disposed on said housing plate 761.

(26) The drive wheel 6, so as to project axially from the body 60, has a connecting wheel 61 having an external toothing 610 molded thereon, said connecting wheel 61 engaging with the ring gear 31 of the cable drum 3 in such a manner that an internal toothing 310 of the ring gear 31 (cf. FIG. 1B, for example) connects in a meshing manner with the external toothing 610 of the connecting wheel 61. The drive wheel 6 and the cable drum 3 are in this way connected in rotationally fixed manner to one another such that the cable drum 3 is rotatable on the carrier element 4 by driving the drive wheel 6.

(27) In order for the drive device 1 to be assembled, the cable exit housing 2 is attached to the carrier element 4, on the one hand, and the drive housing 7 is attached to the carrier element 4, on the other hand. The fastening to the carrier element 4 is in this instance performed in that a fastening element 9 in the form of a screw element is inserted into an engagement opening 721 on the lower side of the drive housing 7 in such a manner that the fastening element 9 extends through an opening 720 in the bearing element 72 of the drive housing 7 (cf. FIG. 9) and engages centrally in an opening 221 within the bearing element 22 of the cable exit housing 2. The cable exit housing 2 and the drive housing 7 by way of the fastening element 9 are mutually axially braced on the bearing elements 22, 72 and are thereon established on the carrier element 4.

(28) A thread for receiving the fastening element 9 can be molded within the opening 221 of the bearing element 22 of the cable exit housing 2. However, it is also conceivable and possible for the fastening element 9 to be screwed into the opening 221 in a self-tapping manner.

(29) For assembly, the cable exit housing 2 is attached to the first side of the carrier element 4 such that the cable exit housing 2 encloses the cable drum 3 and holds the latter on the carrier element 4 as is illustrated in FIGS. 2A to 4A, 4B. The cable exit housing 2 herein, by way of the housing portions 21 thereof that are radially spaced apart from the bearing element 22, by way of base portions 210 comes to bear on a contact ring 45 which circumferentially surrounds an opening 41 in the carrier element 4. Axially projecting positive-lock elements 42 in the form of web-shaped pins are configured on the contact ring 45, said positive-lock elements 42, when attaching the cable exit housing 2 to the carrier element 4, engaging with positive-lock openings 212 (cf. FIG. 4B) on the base portions 210 of the housing portions 21, and in this way achieving an anti-rotation safeguard about the rotation axis D between the cable exit housing 2 and the carrier element 4, said rotation axis D being defined by the bearing element 22.

(30) The web-shaped positive-lock elements 42, when viewed along the circumferential direction about the bearing element, on the lateral edges thereof can extend in an oblique manner (at a minor angle) such that the housing portions 21 when plug-fitting the base portions 210 onto the positive-lock elements 42 are established on the positive-lock elements 42 so as to be free of play along the circumferential direction.

(31) Latching clearances 420 (cf. FIG. 1A, for example) in which latching elements 211 in the form of outwardly projecting latching cams on the housing portions 21 engage in the case of an attached cable exit housing 2 are provided on the internal side of the positive-lock elements 42, as can be seen, for example, in FIG. 6 to FIG. 8. The cable exit housing 2, conjointly with the cable drum 3 enclosed therein, is held on the carrier element 4 in a pre-assembly position by way of said latching connection, even when the drive housing 7 is not yet braced in relation to the cable exit housing 2 by way of the fastening element 9. The latching connection thus simplifies the assembly and prevents the cable exit housing 2 from falling off in the case of an as yet unassembled drive housing 7.

(32) The cable drum 3 in the pre-assembly position, by way of radially projecting bearing elements 32 on the upper periphery of the ring gear 31 (cf. FIG. 1A, for example) comes to bear on a bearing ring 46 within the opening 41 of the carrier element 4 (cf. FIG. 8, for example), such that the cable drum 3 in the pre-assembly position cannot slip through the opening 41 and is held on the carrier element 4 by way of the cable exit housing 2.

(33) The bearing elements 32 serve in particular for securing the position of the cable drum 3 on the carrier element 4 in the pre-assembly position. Upon complete assembly of the drive device 1 the cable drum 3 is connected to the drive wheel 6 by way of the ring gear 31 and is axially established between the cable exit housing 2 and the drive housing 7.

(34) Axially extending securing elements 23 that project in a radially inward manner are disposed on the internal sides of the housing portions 21, said securing elements 23 facing the cable channel 300 on the shell face of the body 30 and when in operation, sliding along said shell face. It is ensured by way of said securing elements 23 that the traction cable 10 received in the cable channel 300 cannot jump out of the cable channel 300.

(35) The drive housing 7 is attached to the other, second side of the carrier element 4 in such a manner that the motor case 73 comes to lie in a molding 44 in the area portion 40, and the worm housing 74 comes to lie in a molding 440 in the area portion 40 that is adjacent to said worm housing 74 (cf. FIGS. 1A, 1B and 2). Fastening installations 71 in the form of engagement bushes having positive-lock openings molded therein engage with positive-lock elements 43 in the form of pins projecting from the lower side of the carrier element 4 when the drive housing 7 is attached. On account of the positive-lock openings of the fastening installations 71, exactly like the positive-lock elements 43 in the form of the pins on the carrier element 4, being radially spaced apart from the rotation axis D defined by the bearing element 72 of the drive housing 7, the drive housing on account of said positive-locking engagement is established in a rotationally fixed manner on the carrier element 4 such that an anti-rotation safeguard for the drive housing 7 is provided.

(36) Engagement portions 51 are disposed on an annular seal 50 of the sealing element 5 on the positive-lock elements 43 of the carrier element 4, such that the positive-locking engagement of the positive-lock elements 43 with the positive-lock openings on the fastening installations 71 is performed with the intervention of the engagement portions 51. The serves for the acoustic decoupling.

(37) A curved portion 52 which comes to lie in the region of the molding 45 for receiving the worm housing 74 is configured on the sealing element 5. The curved portion 52 forms an intermediate layer between the worm housing 74 and the carrier element 4 such that an acoustic decoupling of the drive housing 7 from the carrier element 4 is also achieved thereon.

(38) When the drive housing 7 has been attached to the carrier element 4 with the intervention of the sealing element 5, the drive housing 7 by way of the fastening element 9 is braced in relation to the cable exit housing 2 such that the cable exit housing 2 and the drive housing 7 thereby are mutually established and established on the carrier element 4. As is illustrated in FIG. 9, the fastening element 9 is inserted into the engagement opening 721 within the bearing element 72 of the drive housing 7 such that the fastening element 9 by way of a shank 90 engages through the opening 720 at the head of the bearing element 72 and engages in the opening 221 of the bearing element 22 of the cable exit housing 2. A head 91 of the fastening element 9 herein comes to lie on the side of the opening 720 that faces away from the bearing element 22 such that the cable exit housing 2 is braced in relation to the drive housing 7 by screwing the fastening element 9 into the opening 221 within the bearing element 22.

(39) As can be seen from FIGS. 2 and 6, for example, the cable exit housing 2 on the base 20 thereof on the side that faces away from the carrier element 4 has structural elements 200, 201 in the form of reinforcement ribs which extend radially in relation to the rotation axis D defined by the bearing element 22, or extend circumferentially about the rotation axis D, and reinforce the base 20. Local recesses 202 for weakening the material on the structural elements 200 are achieved herein in the radially extending structural elements 200, said recesses 202 being disposed along a ring about the rotation axis D and achieving a predetermined deforming line for the elastic deformation of the base 20.

(40) When the fastening element 9 is screwed into the bearing element 22 from the side of the drive housing 7, the base 20 can thus be at least slightly deformed such that production-related tolerances can be equalized and the cable exit housing 2 by way of the base portions 210 on the housing portions 21 is established in a play-free manner on the carrier element 4.

(41) The bearing element 22 on an end that faces away from the base 20 moreover has a conical portion 220 in the form of a centering cone (cf. FIGS. 8 and 9) which when bracing the cable exit housing 2 in relation to the drive housing 7 engages in a centering engagement, shaped in a complementary manner, on the bearing element 72 of the drive housing 7, and in this way sets a centered position of the bearing element 22 of the cable exit housing 2 in relation to the bearing element 72 of the drive housing 7. Both the conical portion 220 on the end of the bearing element 22 as well as the centering engagement 722 on the head of the bearing element 72, are conically shaped and herein are mutually complementary, such that the bearing element 22 of the cable exit housing 2 in the event of an engagement is aligned so as to be centered in relation to the bearing element 72 of the drive housing 7.

(42) The bearing element 22 of the cable exit housing 2 and the bearing element 72 of the drive housing 7 herein define a common rotation axis D for the cable drum 3, on the one hand, and for the drive wheel 6, on the other hand, such that the cable drum 3 and the drive wheel 6 when in operation can rotate in a mutually coaxial and conjoint manner.

(43) The concept on which the solution is based is not fundamentally limited to the exemplary embodiments set forth above but can fundamentally also be implemented in an entirely different manner.

(44) A drive device of the type described is in particular not limited to the use in a power window actuator but can also serve for adjusting another adjustment element, for example a sliding roof or the like, in a vehicle.

(45) The drive device can be assembled in a simple manner particularly while using a (single) axially braced fastening element. An assembly comprising few assembly steps which can be simple and cost-effective paired with a reliable establishment of the cable exit housing and of the drive housing on the carrier element results.

LIST OF REFERENCE SIGNS

(46) 1 Drive device 10 Cable 11 Guide rail 110, 111 Deflection 12 Entrainment element 13 Window glass 2 Cable exit housing 20 Base 200, 201 Structural element (reinforcement rib) 202 Recess (material weakening) 21 Housing portion 210 Base portion 211 Latching element 212 Positive-lock opening (slot opening) 22 Bearing element (bearing dome) 220 Centering cone 221 Opening 23 Safeguard 3 Cable drum 30 Body 300 Cable channel 31 Ring gear 310 Toothing 32 Bearing element 4 Carrier element (apparatus carrier) 40 Area portion 41 Opening 42 Positive-lock element 420 Latching clearance 43 Positive-lock element 44 Molding 440 Molding 45 Contact ring 46 Counter bearing (bearing ring) 5 Sealing element 50 Annular seal 51 Engagement portion 52 Curved portion 6 Drive wheel 60 Body 600 External toothing 61 Connecting wheel 610 Toothing 62 Opening 7 Drive housing 70 Housing case 71 Fastening installation (engagement bush) 72 Bearing element (bearing dome) 720 Opening 721 Engagement opening 722 Centering engagement 73 Motor case 74 Worm housing 75 Housing cover 76 Electronics housing 760 Circuit board 761 Housing plate 762 Plug connector 8 Motor unit 80 Electric motor 800 Drive shaft 81 Drive worm 82 Bearing 9 Fastening element 90 Shank 91 Head D Rotation axis X1, X2, X3 Play