EP2230371A2 - Drive unit for cable window regulator - Google Patents

Abstract

The unit (1) has a gear mechanism i.e. drive worm, that is coupled to a rotatably mounted cable drum for winding and unwinding a cable of a cable window lifter. The drum is coupled to a worm wheel (10) received in a cylindrical housing section (6). A sealing unit (30) is rotationally and fixedly set either on an upper circumferential edge of the wheel or on an upper edge (29) of the section. The sealing unit bridges an annular gap between the wheel upper circumferential edge and the housing section upper edge to seal a space of the wheel against a space of the housing section.

Description

FIELD OF THE INVENTION

The present invention relates to a transmission unit and a motor-gear unit for cable power windows of motor vehicles.

BACKGROUND OF THE INVENTION

The diverse requirements for motor-gear units for cable power windows in motor vehicles require in practice relatively narrow parameter ranges with regard to their structural design. In the structural design, the following boundary conditions in particular must be adequately considered: the output power of the electric motor used for the electric drive; the available on-board voltage of motor vehicles, which has an influence on the maximum power output; the frictional forces caused by the constructive design of the windows, which dictate the required minimum output power; the structural design both for windows of motor vehicle front doors and windows of motor vehicle rear doors; the required maximum stroke for adjusting the window; the expected maximum number of operations of the window during the operating time of the motor vehicle; the optional design for both manual and electric drive of the window regulator; the flexural strength and durability of the rope used. In practice, a large number of other boundary conditions must be taken into account.

In practice, these requirements have led to window winder drives with worm gear reduction always having a reduction ratio in the range of about 1:62 to about 1:84, the cable drums having a diameter in the range of about 36 mm to about 48 mm and the power output of the electric motors about 20W. Deviations from these relatively narrow parameter ranges are in practice very difficult, because in a possible modification it is necessary to optimize a multiplicity of boundary conditions, as stated above.

Some of the above parameters, as well as other parameters, can hardly be changed because of serious technical problems. For example, there is one possible reduction of the diameter of the cable drum against the disadvantages that the rope wound relatively high on the cable drum, which in the rope guide and the structural design of rope window regulators causes great problems, and that the rope is bent much more, which is at a cost the durability of the rope goes, which should be guaranteed over the entire operating life of the motor vehicle.

The automotive industry today demands increasingly standardized components that are used universally. This reduces the effort in the design, warehousing and installation. In particular, the fact that for this reason electrical cable windows for both the front door and the rear door today uniformly equipped with electric motors with a possible power output of 20 W, but has the disadvantage that in the rear door a too large volume of construction must be maintained, which is not really necessary. Because the rear windows are usually additionally performed twice in the door and in them the driving force is usually introduced at one point, so that friction or Verkippprobleme are of minor importance. For reasons of space and also for reasons of cost, it would therefore be desirable to equip electric cable windows with electric motors of lower power output. However, this is offset by the comparatively high requirements for adjusting a front window, in particular relatively complicated window guides with a poorer mechanical efficiency and the like.

In the light of all this, it should be borne in mind that even the smallest improvements in the design of gear or motor gear units for cable window lifters are of considerable economic importance in today's cost pressure in the automotive supply industry.

The Fig. 8 shows a sectional view of a transmission unit according to the prior art for electric cable window. Shown is only the gear housing section 6 of the gear unit, in which a worm wheel 10 of a worm gear is received. Through a cylindrical bore on the right edge of the gear housing section 6 extends a motor shaft (not shown), at the front end of a drive screw 15 is seated, the toothing engages the toothing 11 of the Scheckenrads 10. The reduction ratio of the worm gear thus formed is in the prior art in the range of about 1:62 to about 1:84 for the reasons mentioned above.

On the upper end of the gear housing section 6 sits an output driver 40, which has at its upper end a conical serration 41, on which a Cable drum (not shown) with an internal toothing rotatably mounted. The worm wheel 10 is designed as a hollow body, in which at mutually angular intervals holding ribs (not shown) are arranged. In the holding ribs spaced apart from each other at corresponding angular intervals rubber damping elements 39 engage to connect the driver 40 rotatably connected to the worm wheel 10. The output driver 40 and the worm wheel 10 are rotatably mounted together about the pivot pin 9. The output driver 40 and the worm wheel 10 are verschiebegesichert in the axial direction by the locking ring 35. The cable drum (not shown) is used for winding and unwinding the rope of a rope window regulator in the known manner.

On the gear housing section 6 sits an upper housing cover 32, wherein a seal 30 is seated with sealing lips 31 in the annular gap between the inner peripheral wall of the upper housing cover 32 and the outer peripheral edge at the upper end of the Scheckenrads 10 to the worm wheel 10 and the output driver 40 against the Seal gear housing section 6.

The relatively high output power of the electric motor of 20 W according to the prior art and a correspondingly high drive torque make a certain damping in the illustrated conventional motor-gear unit mandatory. The multi-piece structure of the drive train, comprising the output driver, the deformable rubber damping elements connected to the carrier, which engage positively in corresponding holding ribs in the inner circumference of the worm wheel, and the worm wheel, is comparatively complicated and costly.

The provided between the upper end of the worm wheel 10 and the upper housing cover 32 seal 30 increases the axial length of the gear unit, which requires a larger volume in a motor vehicle door. Furthermore, a reliable and durable seal in this way can not always be easily ensured.

SUMMARY OF THE INVENTION

Object of the present invention, it should be to provide a universally applicable for rope windows gear or motor-gear unit, which is even simpler and can be made even more cost-effective.

This object is achieved by a transmission unit according to claim 1 and by a motor-gear unit according to claim 16. Further advantageous embodiments are the subject of the dependent claims.

According to the present invention, there is provided a transmission unit for power window regulators of automobiles comprising a drive and a drive cooperating gear coupled to a rotatably mounted cable drum for winding and unwinding a cable of the cable window lifter. According to the invention, a sealant is mounted in a rotationally fixed manner preferably either on an outer peripheral edge of the worm wheel or on an upper edge of the gear housing section. Thus, the gear housing portion of the transmission unit according to the invention can also be sealed much easier, especially because according to the invention coupled to the worm gear output driver is no longer required.

This feature allows a significantly changed compared to the prior art manufacturing and assembly process. Thus, the sealing means can also be formed in one operation together with other sealing means, such as seals of the electronics housing section, for sealing an electric motor against the housing and the like. For this purpose, in particular, a two-component injection molding (2K injection molding) can be used in which increases after the solidification of the first component, for example, the relatively hard housing, the cavity in the tool and then the second component, for example, the relatively soft Sealant, be sprayed with a second injection unit. Further, the worm wheel can be pushed through the already molded sealant into the gear housing section, while according to the prior art (see. Fig. 8 ) the sealant together with the upper housing cover can only be subsequently placed on the worm wheel. Thus, several operations can be saved.

According to a further embodiment, the gear unit is characterized in that a diameter of the cable drum is in a range of about 22 mm to about 30 mm and more preferably in a range of about 24 mm to about 28 mm, wherein the reduction ratio of the transmission in a Range from about 1:38 to about 1:55 and more preferably ranges from about 1:42 to about 1:51.

Due to the surprisingly simple measure, the diameter of the cable drum designed to be significantly smaller than conventional transmission units and at the same time to change the reduction ratio of the transmission, it is possible for rear cable windows smaller and less powerful drive motors, especially with a maximum power output of only about 10 W and a maximum drive torque of only about 6.0 Nm to use. It turned out that This constructive modification is crucial for the fact that the gear unit can be used for both electric and manual cable windows.

Because complex investigations in the applicant have shown that contrary to the prejudice that such a small cable drum diameter leads to an unacceptably high cable load and thus to a cable break or the like even before the end of the usual operating period of motor vehicles, the maximum cable load in the invention to be used much lower power engines is sufficiently low, so that the rope is durable until the end of the usual operating period of motor vehicles.

In particular, it has been found that the rear windows of motor vehicles are not so often served and also often the maximum lift for rear windows is smaller than that for front windows. Therefore, contrary to the aforementioned prejudice smaller rope drum diameter can be used for rear cable windows and / or the axial length of the cable drum despite their smaller diameter still sufficient without the rope winds too high on the cable drum.

At the same time, the gear unit according to the invention can also be used for front cable windows. Because of the present invention significantly smaller cable drum diameter is also for front cable windows a sufficient lever arm available to adjust the window even with a weaker electric motor with sufficient drive torque. Thus, a sufficient durability of the rope can be ensured for front cable windows.

According to the invention, the reduction ratio of the transmission, in particular of the worm gear, in the same ratio as the cable drum diameter compared to the prior art is reduced. It is advantageous that the cable force-rope speed characteristic of a cable window lifter according to the invention essentially corresponds to that of a conventional cable window lifter.

The inventively made possible significantly lower output torque of the electric motor and its lower power output make it erfmdungsgemäß possible that the cable drum preferably also directly to the transmission, in particular with a worm gear of the transmission, can be coupled. Thus, according to the invention can be dispensed with the use of additional damping elements for damping between the drive shaft and the output shaft, as they are required in the state. Thus, the surprisingly simple design modification according to the invention has the additional advantage that the gear unit can be designed less expensive, which According to the invention leads to a significant cost savings both in construction and during assembly.

According to the invention, the cable drum is coupled to the worm wheel by means of at least two engagement elements arranged on its front side, which engage in a form-fitting manner in at least two counter-elements on a front side of the worm wheel in a manner corresponding thereto. The engagement elements are preferably designed as projections, for example as claws, which engage in correspondingly formed receptacles.

Because the cable drum according to the invention is coupled directly to the worm wheel, in particular engages positively in an end face of the worm wheel, the window can be designed according to the invention either for a manual or an electric drive without further structural modifications would be required. In particular, an identical cable drum, an identical base plate (for fixing the gear or motor-gear unit, for example on a guide rail of the cable window lifter) and an identical bearing cap can be used for both manual and electric cable windows.

For receiving a brake or wrap spring for a manual cable window lifter, the one engagement element, in particular a claw, has a lug to form a receptacle for receiving the brake or wrap spring.

In accordance with another aspect of the present invention, there is also provided a motor transmission unit for automobile power cable windows. This is inventively characterized by the fact that an electric motor is coupled to the transmission unit, which has a maximum drive torque of about 5.7 Nm and / or has a maximum power output of about 10 W.

According to the invention, such a motor-gear unit can be used both for a cable window lifter for a front motor vehicle door and for a cable window lifter for a rear motor vehicle door.

Because the electric motor according to the invention can have a significantly lower maximum torque, the outer dimensions of a motor-gear unit according to the invention can be significantly smaller. The construction volume to be held ready in a vehicle door or in a door module to be integrated into the door can be reduced according to the invention by about 40% or even by 50%. Overall, this leads to a further significant cost savings compared to the prior art.

FIGURE OVERVIEW

Fig. 1

in einer Schnittansicht eine Getriebeeinheit gemäß der vorliegenden Erfindung darstellt;

Fig. 2

in einem schematischen Schnitt den Eingriff eines Schneckenrades und einer Seiltrommel gemäß der vorliegenden Erfindung darstellt;

Fig. 3

in einer perspektivischen Explosionsansicht das Schneckenrad und die Seiltrommel gemäß der Fig. 2 darstellt;

Fig. 4

in einer Schnittansicht eine Getriebeeinheit gemäß einer zweiten Ausführungsform der vorliegenden Erfindung darstellt;

Fig. 5

in einem perspektivischen Teilschnitt eine Motor-Getriebeeinheit gemäß der Fig. 4 darstellt;

Fig. 6a und 6b

in einer perspektivischen Ansicht einen elektrischen Seil-Fensterheber gemäß der vorliegenden Erfindung in zwei verschiedenen Phasen seiner Montage darstellen;

Fig. 7a und 7b

in einer perspektivischen Ansicht einen manuellen Seil-Fensterheber gemäß der vorliegenden Erfindung in zwei verschiedenen Phasen seiner Montage darstellen; und

Fig. 8

in einer Schnittansicht eine Getriebeeinheit gemäß dem Stand der Technik für einen elektrischen Seil-Fensterheber.

The invention will now be described by way of example and with reference to the accompanying drawings, from which further features, advantages and objects to be achieved will result and in which:

Fig. 1

in a sectional view illustrates a transmission unit according to the present invention;

Fig. 2

in a schematic section illustrating the engagement of a worm wheel and a cable drum according to the present invention;

Fig. 3

in an exploded perspective view of the worm wheel and the cable drum according to the Fig. 2 represents;

Fig. 4

in a sectional view illustrates a transmission unit according to a second embodiment of the present invention;

Fig. 5

in a perspective partial section of a motor-gear unit according to the Fig. 4 represents;

Fig. 6a and 6b

in a perspective view represent an electric cable window according to the present invention in two different phases of its assembly;

Fig. 7a and 7b

in a perspective view represent a manual cable window according to the present invention in two different phases of its assembly; and

Fig. 8

in a sectional view of a transmission unit according to the prior art for an electric cable window.

In the figures, identical reference numerals designate identical or essentially identically acting elements or groups of elements.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

The Fig. 1 shows in a sectional view a transmission unit according to the present invention. According to the Fig. 1 the worm wheel 10 is accommodated in the gearbox housing section 6 formed by a housing bottom 7 and side walls 8 extending perpendicular to the housing bottom 7. From the housing bottom 7 protrudes a pivot pin 9 from perpendicular, which may be formed as a metal or plastic pin and is rigidly connected to the housing bottom 7. The pivot pin 9 serves as a rotation axis for the worm wheel 10 and a cable drum according to the Fig. 3 , Through a cylindrical bore on the left Edge of the gear housing section 6 extends a motor shaft of an electric motor, which has at its front end a drive worm 15 which meshes with the worm wheel 10. The worm wheel 10 and the drive worm 15 form a worm gear whose reduction ratio is predetermined by the teeth of the drive worm 15 and the teeth 11 of the worm wheel 10.

According to the present invention, the reduction ratio of the worm gear is in the range of about 1:38 to about 1:55, more preferably in the range of about 1:42 to about 1:51, and more preferably about 1:47. The reduction ratio according to the present invention differs significantly from the conventional reduction ratio for cable windows, which is in the range of about 1:62 to about 1:84.

Above the toothing 11, the worm wheel 10 has a substantially smooth-walled peripheral edge, which lies opposite an upper edge 29 of the side wall 8. The upper peripheral edge of the worm wheel 10 is frictionally gripped by a substantially C-shaped seal, so that the seal 30 is seated on the worm wheel 10 substantially rotationally fixed. An annular gap formed between the upper peripheral wall of the worm wheel 10 and the upper edge 29 of the side wall 8 is bridged by two sealing lips 31 projecting from the seal 30 in a hook-shaped manner and abutting against the inner circumferential wall of the upper edge 29 of the side wall 8. Thus, the worm wheel 10 is sealed against the gear housing portion 6. To mount the worm wheel 10 can be placed together with the seal 30 on the pivot and inserted into the gear housing section 6.

According to the Fig. 1 is formed on the lower end face of the worm wheel 10, an annular bead 36 on which the worm wheel 10 is supported in the gear housing portion 6, for reducing frictional forces. Alternatively, a corresponding annular bead may also be formed on the lower end face of the worm wheel 10. The upper end face of the worm wheel 10 is formed substantially flat and has two receptacles 13, 14, which for the rotationally fixed coupling of a cable drum ( Fig. 2 ) serve with the worm wheel 10, as described below with reference to the Fig. 2 and 3 described.

The Fig. 2 shows in a schematic section the engagement of a worm wheel and a cable drum according to the present invention. According to the Fig. 2 the cable drum 17 on its lower end face on two claws 19, 20, which protrude axially from the lower end side and extend annularly in the circumferential direction. According to the Fig. 2 engage the claws 19, 20 substantially free of play in the corresponding to this trained Receivers 13, 14 on the upper end face of the worm wheel 10, so that the cable drum 17 engages positively in the worm wheel 10.

According to the Fig. 1 protrudes in the illustrated intended position of the worm wheel 10, a conical shoulder 37 of the pivot pin 9 from the plane formed by the upper end face of the worm wheel 10. The conical shoulder 37 serves for the exact positioning of the cable drum 17 in the axial direction. Like in the Fig. 2 is shown in the intended position of the cable drum 17, when the claws 19, 20 are completely received in the receptacles 13, 14 and the conically widening portion of the passage opening 21 of the cable drum 17 abuts against the conical shoulder 37 of the pivot pin 9, a formed comparatively narrow gap in the axial direction between the upper end face of the worm wheel 10 and the lower end face of the cable drum 17, which can serve to compensate for any manufacturing tolerances.

According to the Fig. 2 is at the peripheral edge of the lower end face of the cable drum 17, a radially projecting circumferential projection 23 is formed, which in the intended position of the cable drum 17 on the inner peripheral edge of the seal 30 (FIG. Fig. 1 ) is applied or slightly overlapped and so completes the sealing of the worm wheel 10 against the gear housing section 6.

Like in the Fig. 2 shown, the cable drum 17 engages according to the invention by means of the claws 19, 20 directly into the worm wheel 10 a. According to the invention, therefore, no additional damping elements, such as deformable rubber blocks, necessary to dampen the drive torque of an electric motor. This simpler and less expensive embodiment is a direct consequence of the fact that according to the invention due to the much smaller reduction ratio of the worm gear and the same extent compared to the prior art prior art smaller diameter of the cable drum 17, the maximum drive torque of an electric motor according to the invention can be chosen significantly smaller.

The Fig. 3 shows in a perspective exploded view of the worm wheel and the cable drum according to the Fig. 2 , Like in the Fig. 3 Each of the receptacles 13, 14 is formed of two concentric with the passage opening extending peripheral walls and two of these interconnecting, extending in the radial direction side walls. According to the Fig. 3 deviates the profile of the two receptacles 13, 14 and the claws 19, 20 corresponding to these formed, so that the angular position of the cable drum 17 relative to the worm wheel 10 is clearly specified. As the skilled person readily apparent will be, any other locking or latching elements for non-rotatable connection of the cable drum 17 can be used with the worm wheel 10.

On the outer circumference of the cable drum 17 spiral guide grooves 18 in which the rope of a cable window lifter ( Fig. 7 ) to be led. On the upper end face 25 of the cable drum 17 is a substantially tangentially extending cable nipple receptacle 26 is formed to receive the cable nipple of the rope of the cable window lifter. The cable nipple receptacle 26 opens into a cable feedthrough 27 and into the deflection region 28, where the cable is deflected into the uppermost guide groove 18. A corresponding Seilnippelaufnahme is formed on the lower end face of the cable drum 17 to receive the other end of the rope of the cable window lifter.

Like in the Fig. 3 shown, the claw 20 in the axial direction on a nose or a projection 24, so that, as in the Fig. 7a shown in the case of use for a manual cable window lift a receptacle for receiving the inwardly bent end 58 of the loop or brake spring 57 of the manual cable window lifter 100 (FIG. Fig. 7a ) is available.

According to the invention, the outer diameter of the cable drum 17 is significantly smaller than in conventional cable drums for electric cable windows. According to the invention, the diameter of the cable drum 17 is in a range of about 22 mm to about 30 mm, more preferably in a range of about 24 mm to about 28 mm, and more preferably about 26 mm. According to the invention, the illustrated gear unit can be used both for a manual and for an electric cable window both for front and for the rear doors of motor vehicles.

The Fig. 4 shows a sectional view of a transmission unit according to a second embodiment of the present invention. Like in the Fig. 4 shown, surrounds according to the second embodiment, the annular seal 30, the upper edge 29 of the side wall 8 of the gear housing section 6. From the seal 30 protrudes an upper sealing lip 31 radially inwardly and protrudes a lower sealing lip 31 in a substantially hook-shaped manner radially inwardly. In the illustrated intended position of the worm wheel 10, the sealing lips 31 abut against the upper peripheral edge of the worm wheel 10 in order to seal the worm wheel 10 against the gear housing section 6. For assembly, first the seal 30 can be placed on the upper edge 29 or formed there. Subsequently, the worm wheel 10 is placed on the pivot pin 9 and inserted into the gear housing section 6 through the seal 30 therethrough.

Preferably, the gear unit is manufactured in a two-component injection molding process. In this case, first the housing is sprayed with a first relatively rigid component in a tool, then the cavity of the tool enlarged and injected a second relatively soft component with a second injection unit to all seals (for example, for sealing a plug-in electronics and an electric motor (see. Fig. 6b ) and to seal the worm wheel) in one operation to the housing to inject.

The Fig. 5 shows in a perspective partial section a motor gear unit for cable window according to the Fig. 4 , Like in the Fig. 5 5, the gear housing section 6 is located at the front end of the housing 2, which has a motor housing section 3 for fastening an electric motor (FIG. Fig. 6a ) and for receiving the motor shaft 14 has. On the housing 2, a plurality of mounting portions 4 are provided for fixing the motor gear unit 1 to a vehicle door. Through an insertion opening 5 carbon brushes and a plug-in electronics controlling the electric motor are laterally inserted into the housing 2, so that the carbon brushes abut the commutator on the motor shaft 14. At the front end of the motor shaft 14 sits a drive worm (not shown) which meshes with the worm wheel 10.

Due to the considerably smaller diameter of the cable drum and the correspondingly smaller selected reduction ratio of the worm gear in comparison to the prior art, electric motors with significantly lower maximum drive torque and lower power output can be used according to the invention. Overall, the motor gear unit 1 is thus characterized by a significantly lower volume, so that in a vehicle door or in this of a male door module according to this invention a significantly smaller volume for holding the motor gear unit of a cable window lifter must be kept.

The Fig. 6a and 6b show in a perspective view of an electric cable window according to the invention in two different phases of its assembly. The cable window lifter 100 comprises the circumferentially guided cable 53, which is deflected at the deflection areas 55 by means of deflection rollers 56 and whose ends are received in the upper cable nipple receptacle 26 and the lower cable nipple receptacle of the cable drum 17. For attachment of the motor gear unit 1 to the guide rail 54 and / or a door module and / or a door is the base plate 52. For assembly is first, as in the Fig. 6a shown, the cable drum 17 is placed on a pivot of the base plate 52 and the two cable nipple of the rope 53 hooked into the cable nipple shots. Subsequently, as in the Fig. 6b shown, the motor gear unit 1 with the attached to the housing 2 electric motor 50 so mounted on the base plate 52, that the claws 19, 20 of the cable drum 17 engage in the corresponding receptacles of the worm wheel. Subsequently, the motor gear unit is connected to the base plate 52.

The Fig. 7a and 7b show in a perspective view of a manual cable window according to the present invention in two different phases of its assembly. According to the invention, the cable window lifter 100 is preconfigured identically. According to the invention, a base plate 52 which is identical to the base plate of the in Fig. 6a and 6b shown electric rope window lifter is to be used. According to the Fig. 7a the cable drum 17 is attached to a pivot of the base plate 52 and the cable nipple of the rope 53 are hooked into the associated Seilnippelaufnahmen the cable drum 17. Again Fig. 7a can be removed, the claw 20 of the cable drum 17 has a nose 24, so that a receptacle for receiving the inwardly bent end 58 of the in the Fig. 7a shown Schling- or brake spring 57 is available. On the cable drum 17, as in the Fig. 7b shown, a cylindrically shaped housing or a brake pot 61 fitted with a plate 62, in which engages the crank pin 59 of a manual window lifter. The crank pin 59 carries at its front end a toothing 60. The wrap or brake spring 57 is mounted in the known manner.

1. (1) Die Getriebeeinheit kann wahlweise für einen manuellen oder elektrischen Antrieb von Seil-Fensterhebern verwendet werden.
2. (2) Die Motorgetriebeeinheit kann wahlweise für vordere oder hintere Fenster von Kraftfahrzeugen verwendet werden.
3. (3) Die Seiltrommel, die Grundplatte und der Getriebegehäuseabschnitt können identisch ausgebildet sein.
4. (4) Es können Elektromotoren mit deutlich niedrigerem maximalen Antriebsmoment eingesetzt werden.
5. (5) Dämpfungselemente in dem Getriebegehäuse, beispielsweise zwischen dem Schneckenrad und der Seiltrommel, können entfallen; ein konische Kerbverzahnung an der Seiltrommel zur Verbindung mit dem Schneckenrad oder Dämpfungselemente tragenden Bauelement ist nicht erforderlich.
6. (6) Das Bauvolumen einer Motorgetriebeeinheit gemäß der vorliegenden Erfindung ist deutlich kleiner.
7. (7) Sämtliche Dichtungen können an dem Getriebegehäuse mittels Zwei-Komponenten-Spritzgießens in einem Arbeitsgang angeformt werden.
8. (8) Ein zusätzlicher Lagerdeckel zum Abdecken des in dem Getriebegehäuseabschnitt aufgenommenen Schneckenrads kann entfallen.

In summary, the following advantages can thus be achieved in accordance with the invention:

1. (1) The gear unit can optionally be used for manual or electric driving of rope window regulators.
2. (2) The engine gear unit can be optionally used for front or rear windows of automobiles.
3. (3) The cable drum, the base plate and the gear housing portion may be formed identically.
4. (4) Electric motors with significantly lower maximum drive torque can be used.
5. (5) damping elements in the gear housing, for example between the worm wheel and the cable drum, can be omitted; a conical serration on the cable drum for connection to the worm wheel or damping elements bearing component is not required.
6. (6) The construction volume of a motor gear unit according to the present invention is significantly smaller.
7. (7) All gaskets can be formed on the gearbox by two-component injection molding in one operation.
8. (8) An additional bearing cap for covering the worm wheel received in the gear housing portion may be omitted.

As those skilled in the art will readily appreciate upon reading the foregoing description, numerous variations and modifications can be made without departing from the spirit and scope of the present invention as defined by the appended claims. Such variations and modifications are therefore expressly intended to be embraced by the present invention.

LIST OF REFERENCE NUMBERS

1

Engine transmission unit

2

casing

3

Motor housing portion

4

fastening area

5

insertion opening

6

Transmission case portion

7

caseback

8th

Side wall

9

pivot

10

worm

11

gearing

12

admission

13

admission

14

motor shaft

15

drive worm

16

Through opening

17

cable drum

18

guide grooves

19

claw

20

claw

21

Through opening

22

admission

23

circumferential projection

24

nose

25

upper end side

26

Rope nipple unit

27

Rope through

28

deflection

29

upper edge

30

poetry

31

sealing lips

32

upper housing cover

35

circlip

36

peripheral bead

37

paragraph

39

Rubber damping elements

40

Driven output driver

41

Conical serration

50

electric motor

51

plug-in electronic

52

baseplate

53

rope

54

guide rail

55

deflection

56

idler pulley

57

wrap

58

inward bent end

59

crank pin

60

gearing

61

Housing / brake pot

62

plate

100

Cable window

Claims (16)

Transmission unit for cable power windows of motor vehicles, comprising a drive (14, 50, 59, 60) and a drive (15, 10) cooperating with the drive, which is provided with a rotatably mounted cable drum (17) for winding and unwinding a cable (53 ) of the cable window lifter (100) is coupled, wherein the cable drum (17) is coupled to a worm wheel (10) which is received in a cylindrical housing portion (6) of the gear unit, characterized in that the sealing means (30) rotationally fixed either sitting on an upper peripheral edge of the worm wheel or on an upper edge (29) of the housing portion (6) and bridges an annular gap formed therebetween to seal the space of the worm wheel (10) against the space of the housing portion (6). Transmission unit according to claim 1, wherein the upper peripheral edge of the worm wheel (10) is smooth-walled and the upper edge (29) of the housing portion (6) opposite to form the annular gap. Transmission unit according to one of the preceding claims, wherein an inner diameter of the sealing means (30) corresponds to an outer diameter of the worm wheel (10). Transmission unit according to one of the preceding claims, wherein the sealing means (30) has a substantially axially directed sealing lip, which is designed to be supported against an associated wall, in particular a wall of the cable drum (17) housing receiving. Transmission unit according to one of claims 1 to 4, wherein the sealing means (30) engages around the upper peripheral edge of the worm wheel (10) in particular by frictional engagement, sealing lips (31) projecting radially outward from the sealing means (30) at the upper edge of the housing section (6 ) issue. Transmission unit according to one of claims 1 to 4, wherein the sealing means (30) engages around the upper edge (29) of the housing portion (6), wherein from the sealing means radially inwardly projecting sealing lips (31) against the upper peripheral edge of the worm wheel (10) , Transmission unit according to one of the preceding claims, in which the cable drum (17) is coupled to the worm wheel (10) directly and without the use of additional damping elements. Transmission unit according to claim 7, wherein the cable drum (17) is integrally formed and on an end face (25) at least two engaging elements (19, 20), the form-fitting in corresponding to these formed at least two counter-elements (12, 13) on one end side engage the worm wheel (10). Transmission unit according to claim 8, wherein the engagement elements are arranged on diametrically opposite sides of the cable drum (17) with respect to a central through-hole of the cable drum. Transmission unit according to claim 8 or 9, wherein the engagement elements as projections (19, 20) on the end face (25) of the cable drum (17) and the counter elements as corresponding to the projections formed receptacles (12, 13) on the end face of the worm wheel ( 10) are formed, wherein the projections are received substantially free of play in the recordings. Transmission unit according to claim 10, wherein each of the receptacles (12, 13) has two concentric peripheral walls, which are concentric with respect to a central through-bore of the worm wheel (10) and are interconnected by means of two side walls. Transmission unit according to claim 5, wherein at the peripheral edge of the lower end face of the cable drum (17) a radially projecting circumferential projection (23) is formed, which rests against an inner peripheral wall of the sealing means (30) or covers it slightly. Transmission unit according to one of the preceding claims, wherein the sealing means (30) is formed by a two-component injection molding in which a housing of the gear unit is injection molded in a first step of a comparatively hard plastic and then the sealing means of a relatively soft plastic in a second step is molded onto the housing. Transmission unit according to one of the preceding claims, wherein a diameter of the cable drum (17) is in a range of about 22 mm to about 30 mm and more preferably in a range of about 24 mm to about 28 mm, and that a reduction ratio of the transmission (15, 10) is in a range of about 1:38 to about 1:55, and more preferably in a range of about 1:42 to about 1:51 is lying. Transmission unit according to one of the preceding claims, wherein the cable drum (17) is designed so that the transmission unit (1) is selectively usable for an electric or manual drive, and / or in which the cable drum (17) optionally for a cable pull window (100) is designed for a front motor vehicle door or for a cable window lifter (100) for a rear motor vehicle door. Transmission unit according to one of the preceding claims, which is designed optionally for a manual (59, 60) or an electric (14, 50) drive, wherein mounting areas (4) for fastening the gear unit (1) are provided on a housing (2), wherein the mounting portions (4) for a manual and for a motor gear unit (1) are identical.

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