DE3215203A1 - Window lifter, especially for motor vehicles - Google Patents

Abstract

The invention relates to window lifters, especially for motor vehicles, consisting of a driving part, a braking device, a tensioning device and a connecting member. A band in the form of a toothed belt is preferably provided as a connecting member. The tensioning device is attached to the driving device and makes it possible to tension the connecting member after installation. The braking device engages positively on a sliding rail. An overload protection is attached to the driving part. The fastening elements for the connecting member, of the braking device and on the driving part are designed so that automatic mounting is possible. As a result of the constructive design of the window lifter, cost-effective components can be used. Furthermore, mounting is simplified and can be automated. The operating safety, lifetime, freedom from maintenance and installation tolerances remain unchanged in comparison with the state of the art.

Description

Window regulators, particularly for motor vehicles The invention relates to Improvements to window regulators according to the preamble of claim 1 (see Figure 1). Such window regulators are known and, for example, in the writings Deutsches Patent OS 28 31 870 "pos 27 58 874" AS 12 85 358 U.S. Patent 4, 109, 417 4, 026, 071 described.

These systems are characterized by the fact that they are pliable Own connecting organ. The so-called. Cable window lifters have the disadvantage that the Final assembly of the window regulator is made considerably more difficult by the rope, because hardly any Subassemblies can be formed that the rope under the given conditions of use has only a limited life and that in the event of repairs the replacement of individual Components is difficult. The window regulator known from DE-AS 1285358 has the disadvantage that additional components must be housed separately in the vehicle door and that this makes assembly in the door considerably more difficult.

All known window lift systems have the further disadvantage that is braked on the drive part. This has the consequence that all braking load cases and the Burglary test must be removed via the connecting element. Another disadvantage is that the known systems have no overload protection on the drive part. This has the consequence that the connecting member is far beyond actually moving movement resistance occurring in the window is loaded, e.g. when the movable Holding device has moved against one end of the slide rail and the crank is still is further operated.

In this case, the window regulator must be connected to the door and these themselves are designed to be very stiff and complex.

The tensioning device known from DE-OS 2758874 for the wire rope has the disadvantage that it consists of a large number of parts, which is difficult as an overall system can be mounted, and the clamping process of the connecting member (11) is carried out only once can be.

The object of the invention is to provide a window regulator for motor vehicles in such a way that the system can be used through the structural design of the system allows more cost-effective components, simplifies assembly and can be automated with full maintenance of the required operational safety, service life, maintenance-free, the radial play on the crank and the required installation tolerances.

These objects are achieved by the measures of claim 1.

Further refinements of the invention are set out in the subclaims contain. The invention is explained in more detail with the aid of several exemplary embodiments. There are shown: FIG. 1: Window lifter in a schematic view.

Fig. 2: Drive unit and tensioning device of a ribbon window regulator without a device for the relative movement of the two drive drums.

Fig. 3: Drive unit and tensioning device of a ribbon window regulator with device for the relative movement of the two drive drums.

Fig. 4: Device for positive braking in the upper area the slide rail.

: Fig. 5: Driving device, holder plate, braking part.

Fig. 6: Device for positive braking in all positions on the slide rail.

Fig. 7: Overload protection in the drive part. Fig. 8: Overload protection in the hand crank Fig. 9: Device for wedging the connecting element (11) (Tape) on drive rollers and brake part / holder plate.

1 shows a window regulator in a schematic view. According to the invention, this is characterized by the combination of the following features: - The connecting member (11) can be produced in very great lengths in one operation and wound up. Practice has shown that it is precisely the handling of the connecting element (11), e.g. that of a rope, is very labor-intensive and can hardly be automated can. Next prepares the form-fitting attachment to the holding device (8) + and Significant problems with the drive roller (6), e.g. with a rope.

According to the invention, this is achieved through the use of a wedge connection (30) solved at the tape, which enables an automatic assembly.

Another problem area are the deflections (9a) and (9b) on the Slide rail (7). Here is the invention by creating a suitable Sliding connection at deflection (9a, 9b) / connecting element (11) is an inexpensive one Solution found for the tape. Additional sliding surfaces must be provided for toothed belts to be able to deflect it around smooth rollers (9a, 9b). Smooth rollers as a guide are for toothed belt drives due to the inevitable installation tolerances between Drive and output part unavoidable.

- The connecting element (11) can be turned on by turning the crank bolt After installing the entire window regulator in the vehicle door, a preload are created with a compensation of the manufacturing tolerances. Significant advantages Compared to known systems, there is, among other things, an omission of the end position safety device in both Directions so that the tensioning process repeats (which is the case with frangible systems, e.g. Shear pin, is no longer possible) and can also be automated. There the window be moved up and down anyway during assembly to check the movement there is no additional effort.

- The connecting member (11) is when braking or locking the holding device (8) in the slide rail (7) not overloaded, especially during the so-called burglary test. This is one of the; imperative to use an inexpensive Connecting member (11). Known systems brake in the drive part. Here it becomes Connecting element (11) far beyond what is actually necessary to move the window charged under different conditions.

- If an overload occurs on the connecting element (11), e.g. if the holding device (8) at the end of the slide rail (7) moves against a stop, is ensured by the overload protection (5) on the drive part that the connecting element (11) designed only for the tensile forces actually required to move the window can be. Furthermore, as a result of this measure, the connections of the window regulator in the door and the door are much easier to run without the To influence functional reliability. Such a device is in the known Window regulators not provided.

Figure 2 shows the drive unit and tensioning device of a ribbon window regulator without a device for the relative movement of the two drive drums. She is through it characterized in that the drive roller (6a) is loose, the other drive roller (6b) is radial is positively plugged onto a common crank bolt (4). The drive rollers (6a) and (6b) must not interfere with one another. Another feature of the clamping device is the clamping part (12), which is radially form-fitting onto the crank pin (4) in the Drive roller (6a) is inserted. On the outside of the clamping part (12) is a Torsion spring (13) attached. The torsion spring (13) is characterized by that one end engages inwardly in the clamping part (12 and is secured. The other The end engages outwardly in the drive roller (6a). Clamping part (12) and drive roller (6a) must have notches into which the ends of the torsion feather (13) can be inserted.

Now the drive roller (6a) against the clamping part (12) and the be rotated with this connected part (4) and (6b).

After applying one for the respective application of the window The drive roller (6a) is prevented from rotating radially with the preload selected by the lever secured by the lock (14), which is radially form-fitting on the crank pin (4) is inserted and axially secured by the spacer spring (1). The latch (14) is characterized in that it has a toothing on both the outside Circumference as well as on the side facing the drive roller (6a) several conical shapes Has cams with the same radius. The drive roller (6a) has as a counterpart the end face conical grooves that fit into the lock (14): it is further characterized in that they have a pulled forward on this side Has brim that is internally serrated in a narrow area. The prestressed The drive shaft (6a) can now move over the internal toothing, the external toothing of the Support the lock (14) and the toothing on the crank pin (4). Another one The key feature of the clamping device is the sliding nut (15), which is fitted with a Internal thread on the crank bolt (4), which has a corresponding external thread must be rotated. The sliding nut (15) also has one or more Cams that engage in the base plate (1) during assembly.

. Furthermore there is a spacer spring (16) that secures the sliding nut (15) pushes axially away from the base plate (1). The physical interaction of the individual components is explained according to the invention as follows: On the crank bolt (4) the drive roller (6b), the clamping part (12) and the lock are firmly seated in the radial direction (13).

The drive roller (6a) is radially pretensioned against the clamping part (12) and the torsion spring (13), it can support them on the subsequently pushed open Lock (14). The sliding nut (15), against radial rotation by the cams, which engage in the base plate (1), pushes the outside of the when turned crank the lock (14) out of engagement with the drive roller (6a). The now uncovered Rotational energy at the spring (13) leads to a relative movement of the roller (6a) against it the role (Sb't and thus for tensioning the connecting element (11). Turn now further, the lock (14) finally engages in the groove of the drive roller (6a) a. In this position the cams of the sliding nut (15) come free, i.e. it turns with it now. An axial securing takes place according to the invention by the Distance springs (16 and 17) depending on the installation condition. The power transmission from the crank bolt (4) on the drive roller (6a) thus takes place rigidly with a corresponding preload and installation tolerances relieved the torsion spring (13). changes to the overall length of the connecting element (11), which are determined by differences in the diameter of the drive roller (6a and 6b) (caused by the connecting organ running up or running down (11) on the associated rollers), can on the deflection elements (9a and 9b), Holding device (8) and braking device (10) by spring-loaded deflection of the connecting element (11) to be balanced. A variant of this jig must just in case the use of the form-locking braking device described in claim 14 are provided.

It differs from the clamping device described in that that the power transmission after tensioning the connecting member (11) is not over the interlocking connection between the lock (14) and the drive roller (6a) takes place, but via the tensioning part (12) and torsion spring (13) on the drive roller (6a), so springy. This enables a relative movement when the connecting element (11) is pretensioned the drive roller (6a) against the drive roller (6b! or the holder plate (8) against the lower braking part t10) and finally leads to a positive locking the braking device according to claim 14. The possibility of a relative rotation between the drive rollers (6a and 6b) via the torsion spring allow it to work on deflection devices of the connecting element (1t) for length compensation.

Fig. 4 shows a device for positive braking in the upper Area of the slide rail. It is characterized in that a holding device (8) for the window on a slide rail (7) movably mounted in one direction will. The holding device (8) is connected to a braking part via a driving pin (18) (10) connected.

The braking part (10) is like the holding device (8) on the slide rail (7) mounted movably in one direction. Next to it is the connecting organ (11) attached. To create a distance between the holding device (8) and the braking part (10) a compression spring (19) is inserted, which is guided by the drive pin (18) is. Another feature of this invention are the leaf springs (20a) and (20b), which are curved at one end and engage in the holding device (8) that they can be spread without constraints. The brake part (10) has at one Each side has a nose into which the leaf springs (20a) and (20b) engage. The leaf springs (20a) and (20b) are shaped so that the lugs of the braking part (10) can be inserted.

The function of the braking device is explained according to the invention as follows: If the pane or the holding device connected to it hits a rigid, spring-loaded stop or a stop that is offset by a device, the braking part (10) Moved via the connecting member (11) relative to the holding device (8). Through this the spring (19) is compressed and the leaf springs (20a, 20b) 'spread, the then engage in the recesses in the slide rail (7). These recesses can either rolled into the slide rail (7) or punched - also other manufacturing processes are conceivable.

Fig. 7 shows an overload protection device (5) in the drive part. She is through it characterized in that after a certain torque is exceeded on the crank bolt (4) there is no entrainment and therefore movement of the connecting element (11). To an idle rotation takes place when the connecting member (11) has a certain tensile force or a certain torque on the crank bolt (4) is not exceeded will. The overload protection (5) consists of a Mit-. receiver (21), the radial is mounted firmly and axially displaceably on the crank bolt (4). The driver (21) has two cams beveled on both sides, which are under axial pretension by the spring (23) in a drive roller (6) - or in the case of translation into a pinion (6) intervene. By choosing a suitable spring constant, a helix angle the cams and other installation conditions are set for each torque Balance of forces a. No entrainment takes place in the event that the driver (21) is pushed out of engagement ..

According to the invention by an offset arrangement of the cam on Extent further achieved that now after an idle rotation of the driver (21) in engagement comes. The hand crank (24) thus always returns to its starting position. Between According to the invention, a disk (22) is inserted into the spring (23) and the driver (21).

It serves to keep the spring (23) off the driver (21) to let it slide. Furthermore, it generates depending on the spring constant, installation condition and Type of surfaces of the disc (22) and driver (21) for an always present Frictional torque opposite to the direction of movement. It is therefore also a brake on the drive part suitable for removing small circumferential forces on the connecting element (11).

Fig. 8 shows an overload protection device (5) on the crank bolt and hand crank. It does not differ in the mode of operation from FIG. 7, but the arrangement is of the individual elements different.

An essential characteristic is the spatial relocation of the overload protection (5) from the drive part of the window regulator to the hand crank (24), i.e. the creation an assembly independent of the window regulator. The overload protection (5) exists from a driver (25), which is fixed radially and axially displaceable on the crank pin (4) is stored. The driver (21) has two beveled on both sides Cams on which are under axial preload through the spring (23) Engage in the hand crank (24). The hand crank (24) is supported axially on the Xurbelbolzen (4) - it is axially freely rotatable. Is secured axially the hand crank (24) through a cover (28) via a screw (29) in the crank bolt. The spring (27) rests on the cover (28) - a disc (26) is used as a braking part between the spring (2) and the driver (25) as provided in FIG. 7.

Fig. 9 shows a device for wedging the connecting member Belt on drive rollers (6) and brake part: (10) retaining plate (8). It is characterized by that a wedge (30) made of either plastic or die-cast zinc is so designed is that it consists of a centering and a pressing part. The centering part, attached centrally to the face of the pressing part, is semicircular and conical formed, one end protruding. The pressing part is designed in the plan view like an isosceles trapezoid or like a rectangle with beveled edges.

The connection between the holder plate (8), brake part (10) or drive roller (6) and the connecting member (11) tape is now done so that the tape is pulled taut Condition in a groove of the above

Parts is inserted that. a recess corresponding to the wedge (30) having. The wedge is now inserted from above, with the centering part being the band pushes away in a defined direction and then according to the shape of the wedge presses against the wall.

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Claims (19)

Claims 1. Window lifters, in particular for motor vehicles, with a drive part, which consists of a base plate (1), cover (2), clamping device (3), Crank pin (4), overload protection device (5), drive roller (6a, 6b), slide rail (7), to which a movable holding device (8) is attached, two deflection elements (9a, 9b), for the connecting element (11) and a form-locking braking device (10) consists of a connecting member (11) which is attached to the drive roller (6a, 6b) and is attached to the holding device (8) or braking part (10), characterized by the combination of the following features a) That a connecting element (11) is used comes from which large lengths can be produced and rolled up in one operation let that can be easily cut to length and handled, its elongation in the longitudinal direction is low under operating conditions and a form-fitting, slip-free as possible Connection enables., Preferably a band is provided. b) That a Spannvorrichtunq (3) on the drive drum (6a, 6b) is provided, the tension of the connecting member (11r made possible by turning the crank bolt (4) after installing the window regulator. c) That a form-fitting braking device (10) acts on the slide rail. d) That an overload protection device (5), connected to the crank pin (4) on the drive part is provided. e) That the fastening elements for the connecting member (11> on the holding device (8), the braking device (10) and on the drive roller (6a, 6b) are designed so that automatic assembly is possible. 2. Window lifter according to claim 1, characterized in that Cias The connecting element (11) is an open flat band which is connected via the deflection elements (9a, 9b), which are bolt-shaped at the run-up points, slides at a on the connecting member (11) matched material pairing. The ribbon is made made of woven polyester. 3. Window lifter according to claim 1 and 2, characterized in that the connecting element is made of woven polyester and covered on both sides with neoprene is coated. 4. Window lifter according to claim 1, 2 and 3, characterized in that the connecting member (11) is an open flat band, which at its ends as well as in the middle has driver. 5. Window lifter according to claim 1, 2, 3 and 4, characterized in that that both deflection elements (9a, 9b) are smooth rollers. Another characteristic is that a loosening of the connecting member (11) by the introduction of a bracket is no longer possible. 6. Window lifter according to claim 1 and 5, characterized in that the connecting member (11) is an open toothed belt, the upper surface of which is additional Has sliding surfaces. 7. Window lifter according to claim 1 to 5, characterized in that the connecting member (11) is open and each on separate drive rollers (6a) and (6b) runs up, with the drive roller (6b) fixed and the drive roller (6a) pretensioned and is secured on the crank bolt (4). Another hallmark is there by axial displacement of the lock (14) on the crank bolt (4) via a counter Rotating secured sliding nut (15) released the fuse and the connecting member (11) is tensioned by turning the roller (6a) against the roller (6b), the stored energy of the preloaded torsion spring (13) is used to this rotary movement to execute. If there is further axial displacement, there is a form-fit entrainment the drive roller (6a) over the lock. 8. Window lifter according to claim 7, characterized in that according to the tensioning of the connecting member (11) a resilient entrainment via the torsion spring (13) takes place. 9. Window lifter according to claim 7 and 8, characterized in that the system is secured axially by the base plate (1) and the cover (2). 10. Window lifter according to claim 7 and 9, characterized in that the drive roller (6a) an inevitable relative movement during the lifting or lowering process against the drive roller (6b). This is achieved in that a sliding nut (14) Axial movement is generated on the crank pin (4) via the lock (14) is inevitably transformed into a relative rotation of the drive roller (6a): is. By Choice of a suitable preload and a drive between the clamping part (12) and Drive roller (6a) ensures that a relative rotation is only due to the axial movement occurs. 11. Window lifter according to claim 7, 9 and 10, characterized in that that the tensioning part (12) is omitted and the torsion spring (13) n the drive roller (6b) is laid, one end engaging the drive roller (6a). 12. Window lifter according to claim 1, characterized in that if the disc or the associated holding device (8) against a (spring-loaded) Stop moves, the braking part (10) via the connecting member (11) relative to Holding device (8) moves, compresses the spring (19) and thus the Spread leaf springs (20a and 20b), which then form-fit into recesses in the slide rail (7) intervene. The invention is further characterized in that when in this Position a force is introduced into the disc, this is via the leaf springs (20a and 20b) supported on the sliding bar without loading the connecting member (11). The brake is achieved according to the invention in that the brake part (10) in another Direction is pulled and thus the braking part (10) against the holding device (8) executes a relative movement and thereby the leaf springs (20a) and (20b) via lugs to the braking part (10) contracts. 13. Window lifter according to claim 12, characterized in that one additional non-positive braking device is provided on the drive member. By a suitable choice of the braking torque and the stiffness of the spring (19) is achieved, that in every position of the holding device (8) small forces in both directions force fit and high forces are positively absorbed in one direction can. 14. Window lifter according to claim 1 and 7, characterized in that when on the disc or the holding device (8) connected to it in any Position a downward force is introduced, the holding device (8) moves relative to the braking part (10). This causes the leaf springs (20a) and (20b) spread, which form-fit into the recesses of the slide rail (7) intervention. A prerequisite for the relative movement is that the drive roller (6a) according to claim 7 can move against the drive roller (6b). It is released by pulling on the connecting element (11). The leaf springs (20a and 20b) are out of their position, guided over Lugs on the brake part (10), open. 15. Window lifter according to claim 1 to 14, characterized in that a driver (21) radially fixed and axially movable on the crank pin (4) is mounted, the driver (21) having two cams beveled on both sides has, which have different diameters and in the drive roller (6) (or with gear ratio pinion) non-positive with axial preload of the spring (23) intervention. When a certain torque is exceeded on the crank pin (4) the driver (21) is pushed axially out of engagement and engages after a Idle rotation back into the drive roller (6). A disc (22) between the radially secured and axially pretensioned spring (23) and the driver (21) introduced, Depending on the nature of the surface, it generates a frictional torque against the direction of movement and thus serves as a brake for low forces in both directions. 16. Window lifter according to claim 1 to 14, characterized in that a driver (25) radially fixed and axially displaceable on the crank pin (4) is mounted, the driver (25) having two cams beveled on both sides has, which have different diameters and the hand crank (24) non-positively engage with the spring (23) being axially pretensioned. When a certain torque is exceeded on the hand crank (24) the driver (25) is pushed axially out of engagement and engages after a Idle rotation again ion engages the hand crank (24). 17. Window lifter according to claim 1 to 3, 5 and 7 to 16, characterized in that that the connecting member (11) by a wedge (30) which is shaped so that he consists of a centering and a pressing part, in the drive rollers (6a, 6b) and the holding device (8) or braking device (10) is pressed in. 18. Window lifter according to claim 17, characterized in that the Wedge (30) on the drive roller (6a, 6b) and the holding device (8) or the braking device (10) is injected 19. Window lifter according to claim 1 to 4 and 7 to 18, characterized characterized in that as a spacer element between the driven part in each case of the deflecting elements above (9a) and below (9b) and the drive part a plastic tube open to one side is introduced, in which the connecting member (11), preferably runs in the band.