FR2828521A1 - WINDOW REGULATOR DRIVE WITH MEANS FOR HOLDING THE DRUM IN ITS HOUSING - Google Patents

Abstract

The invention relates to a lifter drive device comprising a cable winding drum (2) accommodating in a first tank-shaped housing (3), open on one of its faces and having an orifice ( 5) provided in its bottom (4), drive means of said drum (2) accommodating in a second housing (11) disposed on the open face of said first housing (3), said second housing having a shaft (16) passing through the hub (6) of said drum (2) and the free end of which fits in said orifice (5), and means for maintaining said drum (2) in said first housing when said second housing (11) is disconnected from said first housing (3), characterized in that the means for retaining the drum (2) comprise an annular row of detents (22) formed at the periphery of a fixed sleeve (20) which extends to the inside the hub (6) of the drum (2) from the periphery of the orifice (5) and which surrounds the axle (16), and the hub of the drum (2) has an annular groove (23) in which housed said stop notches (22) with play.

Description

with another pinion driven by the single motor (12).

  The invention relates to a device for driving the window regulator

  cables for motor vehicles.

  It relates more precisely to a window lifter drive device comprising a cable winding drum housed in a first tank-shaped casing, open on one of its faces and having an orifice formed in its bottom , means for driving said drum housed in a second casing arranged on the open face of said first casing, said second casing having an axis passing through the hub of a drum and whose free end accommodates in the orifice, and means for holding said drum in said first housing when

  dissociates said second housing from said first housing.

  In general, the drive means of the drum comprise a drive wheel supported by the axis and driven by the shaft of an electric motor whose body is secured to the second cas ^ tier. This second box is then fixed on the first box which is itself fixed on a support of the vehicle door. The axis also supports the

cable winding drum.

  The gear motor is generally placed on the dry side of the vehicle. that is to say on the side of the passenger compartment. When it is necessary to repair the gear motor, the second casing is separated from the first casing. To prevent the cable winding drum from coming out of its housing, which could cause the cables to unwind, means are provided to keep the drum in its housing, in

  disassembly of the gear motor.

  EP 0 380 911, which represents the closest state of the art to the invention, describes a window lifter drive device in which the hub of the winding drum is extended on the bottom side of the bo ^ tier by a sleeve surrounding the axis and the end of which is disposed in the orifice of the first casing and includes undercuts forming stop notches which cooperate with the outer periphery of the orifice to axially retain the drum winding compared to the first

  cas ^ tier, especially when removing the axis.

  When operating the window regulator, the end of the sleeve rubs against the axis and against the wall of the housing which delimits the orifice. This can lead in the long run to untimely wear of the catch notches which

  could make them inoperative if necessary.

  The object of the invention is to avoid this drawback.

  The invention achieves its object by the fact that the means for holding the drum comprise an annular row of stop notches formed on the periphery of a fixed sleeve which extends inside the hub of the drum from the periphery of the orifice and surrounds the axis, and the hub of the drum has an annular groove in which lodge with a clearance

the stop clicks.

  This avoids friction between the sleeve and the axis and between the

sleeve and the first box.

  Very advantageously, the clearance is calculated so as to avoid friction between the catch notches and the surfaces delimiting the groove

when rotating the drum.

  Thus, the catch notches undergo no wear and preserve

  their intrinsic qualities over time.

  Advantageously, the catch notches have a conical surface in order to allow the drum to be mounted by force in the first housing. According to a first embodiment, the sleeve is made in one piece with the first housing. In this case, the case is

  advantageously made by molding a plastic material.

  According to a second embodiment, the sleeve and the first housing are produced separately. In this case, the sleeve has at one end an undercut forming a shoulder for its attachment to the periphery of the orifice of the first housing. The sleeve is produced by molding a plastic material. The first case can

  then be made by stamping a sheet.

  Other advantages and characteristics of the invention will emerge

  on reading the following description given by way of example and in

  reference to the accompanying drawings in which: - Figure 1 shows a window regulator drive device according to a first embodiment of the invention; - Figure 2 shows a window lifter drive device according to a second embodiment of the invention; - Figure 3 is a front view of the sleeve which shows the notches; - Figure 4 is a section of the sleeve along line IVIV of Figure 3, the lower part of this figure further showing the arrangement of the drum during assembly and the upper part showing the drum positioned on the sleeve, and - Figure 5 shows an alternative embodiment of the sleeve which

facilitates the installation of the window regulator.

  The drive device 1 of an electric window regulator with cables, shown in FIGS. 1 and 2 comprises a winding drum 2 of cables accommodating in the internal cavity of a first tank 3 in the form of a tank , of geometric axis X, the bottom 4 of which has a circular orifice 5 coaxial with the axis X. The first housing 3 has a large opening on its face opposite the bottom 4. In operation, this opening is closed by the interface a gear motor 10 consisting of a second housing 11, also in the form of a tank fixed to the first housing 3 by

  fixing means, screws 12 for example.

  The reference 13 represents the shaft of an electric motor which comprises in the second housing 11 a worm gear meshing with a toothed wheel 14 mounted in a journalled manner on a hub 15 of axis X coming from the second housing 11. An axis 16 or pin of axis X, secured to the second housing 11 passes through the hub 15 of the second housing 11 and the hub 6 of the drum 2. The free end 17 of the axis 16 is housed in the orifice circular 5 from the bottom 4 of the first housing 3. Thus, the axis 16 supports the drum

cable winding 2.

  The latter has at its periphery a helical groove 7 in which is wound the end of a drive cable and from which unwinds another drive cable, in the direction of

  rotation of the drive wheel 14.

  The connection between the drive wheel 14 and the winding drum 2 is carried out by axial lugs 18 formed on one face of one of these parts, and cooperating with cavities formed in the face opposite the 'other room with possible interposition of elastic anti-vibration means. The reference 19 designates a plate integral with the second gearbox 11 which prevents the drive wheel 14 from escaping from its housing when the geared motor is detached from the first gearbox, for repair needs for example m ple. In these conditions, the axis 16 being integral with the second box ^ tier 11, the winding drum 2 is no longer supported by the axis 16 and is capable of

get out of his accommodation.

  To prevent the drum 2 from escaping from its housing, according to a first embodiment of the invention shown in FIG. 1, the first housing 3, made of plastic material by molding, comprises a sleeve 20, of axis X which extends from the periphery of the orifice 5 towards the interior of the first bo '^ tier 3. This sleeve 20 has at the periphery of its internal end 21, as shown in FIGS. 3 and 4 , a plurality of notches 22 in the form of bevelled teeth. The hub 6 of the rolling drum 2 has an annular groove 23 in front of the n a n ula ire of stop notches 22 in which the stop notches 22 are accommodated with play after the drum 2 has been forcefully mounted on the sleeve 20. To allow easy mounting of the drum 2 on the sleeve, as shown in the lower part of Figure 4, the front face of the end 21 of the sleeve 20 is conical. The diameter of the hub 6 near the bottom 4 of the first housing 3 is substantially equal to the external diameter of the sleeve 20, and the diameter of the other part of the hub 6 outside of the groove 23, is substantially equal to the internal diameter of the sleeve 20, which is itself substantially equal to the diameter of the axis 16. The end 21 of the sleeve 20 also has axial slots 24 which allow the catch notches 22 to retract radially towards the axis X when the front face 2a of the drum 2 is in abutment on the conical front face of the end 21 of the sleeve 20 and an axial force F2 is applied to the drum 2. When the stop notches 22 are positioned in the groove 23 , these notches are not in contact with the surfaces delimiting said groove, due to the play, as can be seen on the

upper part of figure 4.

  Advantageously, the face 23a of the groove 23 located in the vicinity of the bottom 4 of the first bo '^ tier extends radially in a plane perpendicular to the axis X so as to bear against the radial faces 22a vis-à-vis notches 22, when the geared motor is detached from the first housing, which prevents the stops 22 from bending

radially inward.

  According to a second embodiment of the invention shown in Figure 2, the means for preventing the escape of the drum 2 from its housing also include a sleeve 20 'secured to the first box ^' tier 3 and which extends towards the 'interior of said bo ^' tier 3 from orifice 5. But here, the sleeve 20 'and the first bo ^' tier 3 are two pieces assembled together. The sleeve 20 'is made by molding a plastic material, and the first cas ^ tier can be made by molding the same or another plastic material or can be made by stamping a sheet. The drum 2 also has an annular groove 23 in its hub 6 and the internal end 21 of the sleeve 20 'also includes a row of catch notches 22, as described

  for the first embodiment.

  The outer end 30 of the sleeve 20 'has at its periphery an annular groove 31 delimited by radial shoulders and in

  which houses the periphery of the orifice 5 of the first housing 3.

  The front face of the outer end of the sleeve 20 ′ also has a conical surface 33, and this end also has axial slots 34 in order to allow easy mounting of this end 32 around the periphery of the orifice 5, in the manner indicated above for mounting the drum 2 on the sleeve 20 according to the first embodiment. The mounting of the drum 2 on the first box 3 is done in the following order, the external end 32 of the sleeve 20 'is first mounted in the orifice 5 of the first box 3 by exerting on the sleeve 20 'an axial force F1, then the drum 2 is mounted on the sleeve 20' by applying an axial force F2 to the drum. Then the second housing 11 is mounted on the first housing 3, sliding the axis 16 through the bore of axis X of the hub of the drum 2 and the bore of axis X of the sleeve 20 and possibly exerting an F3 force on the second

housing 11.

  When the second box 11 is separated from the first box 3, the pin 16, integral with the second box 11, is withdrawn from the orifice 5 and from the hub 6 of the winding drum 2. But this the latter is held captive in the first box 3 thanks to the retaining catches 22

  on the radial face 23a of the groove 23.

  Figure 5 shows an alternative embodiment of the sleeve 20 or 21 '. The internal diameter of the sleeve 20 is greater than the diameter of the axis 16 in the vicinity of its internal end 21 and equal to the diameter of the axis 16 in the orifice 5. The presence of the axial slots 24 and the increase in the internal diameter of the sleeve 20 in the vicinity of its internal end 21 allow the catch notches 22 to retract radially towards the axis X, during the mounting of the second housing 11 on the first housing ^ tier 2, the drum 2 having been previously mounted on the axis 16. During a subsequent disassembly of the second cas ^ tier 11, the stop notches

  22 will keep the drum 2 in the first housing 3.

Claims (10)

  1. Window-lifter drive device comprising a cable winding drum (2) housed in a first tank-shaped casing (3), open on one of its faces and having an orifice (5 ) formed in its bottom (4), means for driving said drum (2) accommodating in a second housing (11) disposed on the open face of said first housing (3), said second housing having an axis ( 16) passing through the hub (6) of said drum (2) and the free end of which is housed in the orifice (5), and means for holding said drum (2) in said first housing when said second bo is separated ^ front (11) of said first box ^ tier (3), characterized in that the means for holding the drum (2) comprise an annular row of notches (22) formed at the periphery of a sleeve (20 ) fixed which extends inside the hub (6) of the drum (2) from the periphery of the orifice (5) and which surrounds the axis (16), and the hub of the drum (2) comprises rte an annular groove (23) in   which house said stops (22) with play.   2. Device according to claim 1, characterized in that the play is calculated so as to avoid friction between the catch notches (22) and the surfaces delimiting the groove (23) during the rotation of the drum (2) .   3. Device according to any one of claims 1 or 2,   characterized by the fact that the catch notches (22) have a conical surface in order to allow the drum (2) to be force fitted in the first box '^ tier (3).   4. Device according to any one of claims 1 to 3,   characterized in that the sleeve (20) is made in one piece with the first box (3).   5. Device according to claim 4, characterized in that   the first housing (3) is made of a plastic material by molding.   6. Device according to any one of claims 1 to 3,   characterized by the fact that the first housing (3) and the sleeve (20 ') are made in two pieces, the sleeve (20') comprising an undercut (31) forming a shoulder for its fixing on the periphery of the orifice (5) of the first box (3).   7. Device according to claim 6, characterized in that   the sleeve (20 ') is made of plastic material by molding.   8. Device according to one of claims 6 or 7, characterized   by the fact that the first cas ^ tier (3) is made by stamping a sheet.   9. Device according to any one of claims 1 to 8,   characterized by the fact that the internal end (21) of the sleeve (20, 20 ') has axial slots (24).   10. Device according to claim 9, characterized in that the internal diameter of the sleeve (20, 20 ') is greater than the diameter of