EP2064096A1

EP2064096A1 - Window wiper system with a window wiper drive, in particular for a rear window wiper of a motor vehicle with a gear arrangement which can be exchanged in a modular manner

Info

Publication number: EP2064096A1
Application number: EP07787410A
Authority: EP
Inventors: Roland Bohn; Paul Geubel
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2006-09-08
Filing date: 2007-07-12
Publication date: 2009-06-03
Also published as: JP4971448B2; KR20090051067A; CN101511651A; WO2008028710A1; BRPI0712054A2; KR101396800B1; DE102006042322A1; CN101511651B; US20090272208A1; JP2010502503A

Abstract

The invention relates to a window wiper system with a window wiper drive (1), in particular for rear window wipers of a motor vehicle, with a gear housing (10), which can be closed by means of a housing cover (14), for accommodating a gear arrangement (11), wherein the gear housing (10) and the housing cover (14) each have a run-on surface (15a, 15b) for the axial guidance of the gear arrangement (11). When the housing cover (14) is closed, an intermediate space (16) is formed between the mutually opposite run-on surfaces (15a, 15b), said intermediate space corresponding to the geometrical dimensions of an installation region of the gear arrangement (11) to be inserted.

Description

Windscreen wiper system with a windshield wiper drive, in particular for a rear window wiper of a motor vehicle with a modular interchangeable gear assembly

The present invention relates to a windshield wiper system with a windshield wiper drive, in particular for a rear window wiper of a motor vehicle according to the preamble of patent claim 1.

State of the art

Windscreen wiper systems of the above type are already known. In the patent application DE 100 14 735 Al a generic windshield wiper drive is disclosed, which has a transmission housing, in which a transmission is installed, and which is closable with a housing cover. The transmission is designed as a transfer gear, which is driven by means of a drive motor, a worm and a worm wheel. On the worm wheel, a push rod is fixed, which is pivotally connected to a web. The web provides an equally spaced connection between the hinge of the push rod and the wiper shaft.

On one side of the wiper shaft outside the gear housing, a windshield wiper is arranged rotationally. On the opposite side of the wiper shaft, a pinion is mounted within the gear housing, which meshes with a toothed segment on the push rod. Thus, in a homogeneous circular motion of the worm wheel, the wiper shaft performs a pendulum motion.

Above and below the pinion a guide bar is rotatably mounted on the wiper shaft. For axial securing or axial guidance of the transmission, the transmission housing and the housing cover each have a mutually opposite contact surface. As a result, the wiper shaft is guided or secured axially at the same time via the transmission housing-side as well as via the gear cover-side contact surface.

From the patent application DE 42 19 480 Al another wiper drive for a motor vehicle is disclosed, which for generating different wiping angle having a correspondingly designed gear arrangement. According to one embodiment, the gear arrangement is designed in the manner of a crank mechanism. One end of the toggle-type crank mechanism is driven by a worm wheel. The other end is rotationally connected to a wiper shaft. The driven wheel can at least two selectively usable articulation points for the

Have crank mechanism or have at least one with respect to the axis of rotation in the radial direction of the wheel adjustable articulation point. A combination of both may be provided. Thus, the goal is to provide a windshield wiper drive for a motor vehicle, which in different types of drives to realize different wiping angles while maintaining a predetermined parking position of

Wiper is used.

In the known versions of various windshield wiper drives, however, the problem often arises that the windshield wiper drive must be adapted to the respective embodiment of the transmission arrangement. Although in an optional use of the articulation points for the crank mechanism or at least one adjustable relative to the axis of rotation in the radial direction of the articulation pivot flexible adjustment of the windshield wiper drive to different wiping and parking positions of the wiper allows, however, this structural design brings a considerable design effort with it.

Although the transfer gear reaches, in contrast to the crank mechanism a larger paintable wiper angle. Due to the toothing between the pinion and the toothed segment but the transfer gear is more expensive and therefore more expensive.

Depending on the vehicle model, a smaller paintable wiping angle of a windshield wiper drive with a crank mechanism may be sufficient. For this purpose, it is desirable to be able to select the windshield wiper drive vehicle-specific. For this purpose, however, in the prior art, the entire windshield wiper drive and in particular the geometric design and the mechanical

Connection points on the tailgate or the body of the vehicle adapted for the particular application to the design of the wiper system and configured accordingly constructive. It is therefore an object of the present invention to provide a windshield wiper drive, which is more flexible and can be installed independently of the gear type in the tailgate or in the body of a motor vehicle with low design effort.

Disclosure of the invention

This object is achieved on the basis of a windscreen wiper drive for the rear window wiper of a motor vehicle according to the preamble of claim 1 in conjunction with its characterizing features. advantageous

Further developments of the inventions are specified in the dependent claims.

The invention includes the technical teaching that a space is formed for receiving also different types of gear arrangements with closed housing cover between the opposing contact surfaces, which is the geometric

Dimensions of a provided on the gear assembly installation area corresponds, wherein the installation area of the various gear arrangements is uniform.

This solution has the advantage that with an identical design of the insertion of the transfer gear and the crank gear an optional installation or replacement of various embodiments of the gear assembly within a single gear housing is possible, so that can be decided later in the project stage, which gear type, for example, dependent actually be incorporated in the wiper drive of the vehicle type.

The intermediate space corresponds to the distance between the contact surface of the gear housing and the contact surface on the housing cover. If the gear assembly is inserted into the transmission housing, then this is then closed with the housing cover. With the housing cover closed, the two abutment surfaces are mutually opposed and the gear assembly becomes axially, i. in the direction of

Wischwellenachse the wiper shaft out. As a result, both the gear arrangement is guided between the gear housing and the housing cover, as well as the wiper shaft axially fixed to the gear housing. - A -

By means of this geometric configuration, the gear arrangement can comprise, for example, a transfer gear or a crank gear.

According to one embodiment of the invention, a transfer gear is inserted into the housing. The transfer gear has a pinion mounted on the wiper shaft and upper and lower guide ribs respectively adjacent to the pinion, the insertion portion of the transfer gear being formed by the height of the pinion and the guide webs. The upper and lower guide web is in each case rotatably arranged on the wiper shaft, wherein the pinion is pressed axially and rotationally fixed to the wiper shaft. The torque which is transmitted to the wiper shaft is introduced via the pinion. Alternatively, only a single guide bar can be provided. However, the installation area formed by the individual guide web and the pinion corresponds in the same way to the intermediate space of the mutually opposite contact surfaces between the gear housing and the housing cover.

According to an alternative embodiment of the invention, a crank mechanism is inserted with its insertion in the housing. In this exemplary embodiment, the crank mechanism has a lever element pressed onto the wiper shaft, wherein the insertion region is formed by the height of the lever element. The lever element is pressed onto the wiper shaft and transmits the torque to the wiper shaft. By eliminating a toothing in this embodiment, the torque is transmitted directly to the wiper shaft via the lever element, wherein the lever element is articulated by means of a push rod. In this case, the lever element, at least in the region of the wiper shaft, the height corresponding to the installation area, wherein the

Lever element may be formed in one or more parts, so that for example the lever element in the region of the pressure on the wiper shaft can be reinforced by a correspondingly designed essay. By means of this embodiment, the lever element in the region of the wiper shaft can have a greater thickness than in the region of the articulated connection with the push rod.

According to a further advantageous embodiment of the invention, the wiper shaft is mounted in a guide bore introduced in the transmission housing. The contact surface formed on the gear housing is formed by the end face of the opening into the gear housing guide bore, so that the wiper shaft extends through the run-up surface. As a result of this arrangement, the components of the gear arrangement placed on or pressed onto the wiper shaft can be brought to the contact surface in the gear housing for plane contact. The contact surface is thus present as an annular surface in the transmission housing, so that the at least one guide web is brought to the plane contact with the contact surface of the transmission housing.

The contact surface formed on the housing cover can be formed by the end face a ring ringer formed radially around the wiper shaft axis in the inside of the housing cover. The ring elevation in the inside of the housing cover can have the same inner diameter and the same outer diameter as the contact surface in the transmission housing.

In the installation case of the transfer gear, the ring lift comes to the plan system of the outer guide bar, which is mounted end on the wiper shaft. In the installation case of

Crank gear, however, only comes the lever element for plane contact with the ring lift within the housing cover. Since the ring elevation in the inside of the housing cover is also formed radially around the wiper shaft axis, the two annular contact surfaces face each other plane-parallel.

According to a further embodiment, it is provided that the space enclosed by the inside of the gear housing and the housing cover space for the gear assembly is geometrically such that the operation of the gear assembly is collision-free executable both in training as a transfer gear and as a lever gear. In particular, the field of

Push rod and the lever member or the pinion and the guide webs from the interior of the gear housing and the housing cover in such a way that the respective gear assembly can move without collision within the gear housing or the housing cover. On the other hand, it should be noted that the windshield wiper drive is nevertheless compact in order to keep the space as small as possible. Therefore, the outer contour of the gear housing and the housing cover should be approximated as close as possible to the envelope shape, which is formed by both the transfer gear and by the crank gear. The transfer gear and the lever mechanism may in one embodiment have a worm wheel, wherein the worm wheel of the transfer gear and the lever mechanism have a mutually identical shape. It is further provided that the windshield wiper drive comprises a drive motor with a worm, wherein the drive motor and the worm for the drive of the transfer gear or the

Lever gear have a mutually identical shape. Thus, the optional installation of the gear assembly can be limited to the components of the push rod, the pinion, the lever member and the guide webs, provided that the drive motor and the worm and the worm are designed as equal parts. The differing components between the transfer gear and the crank gear are thus limited to the push rod, the pinion and the two guide webs for the transfer gear and the push rod and the lever element for the crank gear.

Depending on the radius on which the push rod is mounted on the worm wheel by means of a hinge pin, the connection point of the push rod, which is designed for the execution of the transfer gear with a toothed segment, can be exchanged in a simple manner against a push rod, which in the case of a crank gear does not include a toothed segment. Further, the wiper shaft by removing the housing cover in the direction of the wiper shaft axis of the

Transmission housing can be removed, wherein the interference fit of the wiper shaft can be exchanged with the lever element in the case of a crank gear or the interference fit of the wiper shaft with the pinion and the assembly of the two guide webs.

According to a further embodiment of the invention it is provided that the gear housing is made of a die-cast aluminum and / or the housing cover made of a plastic material. Furthermore, it can be provided that also the gear housing itself is made of a plastic material by injection molding. Depending on the fit, which is intended for the installation area, the

Plastic housing cover, which preferably consists of a resilient material, be designed so that in the installed state of the gear assembly and screwed on housing cover to the gear housing to the gear assembly between the contact surfaces a bias is applied to bias the gear assembly within the housing backlash. Further measure improving the invention will be described in more detail below together with the description of a preferred exemplary embodiment of the invention with reference to figures.

exemplary

It shows:

Figure 1 is a plan view of a windshield wiper drive with a built-in conversion gear;

Figure 2 is a side cross-sectional view of the wiper drive with a built-in transfer gear;

Figure 3 is an illustration of a pinion, at least one guide bar and a push rod with a toothed segment of a transfer gear;

FIG. 4 shows a cross section through a side view of the transfer gear from FIG. 3;

Figure 5 is a plan view of a windshield wiper drive with a built-in this crank gear;

FIG. 6 shows a cross section through a side view of the windshield wiper drive with a crank mechanism;

Figure 7 is an illustration of a lever element, a wiper shaft axis and a push rod of a crank mechanism;

8 shows a cross section through a side view of the crank mechanism

FIG. 7.

The windshield wiper drive 1 shown in FIG. 1 comprises a transmission housing 10, in which a gear arrangement 11 is accommodated. The gear assembly 11 is used for driving a wiper shaft 13, which performs a pendulum movement about a wiper shaft axis 12. In this case, the gear assembly 11 is formed as a transfer gear, which comprises a push rod 24 which is articulated between at least one guide web 18 and a worm wheel 21. The worm wheel 21 is driven by a drive motor 22 via a worm 23, wherein the

Worm 23 meshes in the spur toothing of the worm wheel 21. Thus, the worm wheel 21 performs a continuous rotational movement. By a relation to the axis of rotation of the worm wheel 21 eccentric articulation between the push rod 24 and the worm wheel 21, a reciprocating motion is caused in the push rod 24, wherein the push rod 24 hinged to the

Guide web 18 is connected. Due to the plan view of the gear assembly 11, only one of two guide webs 18 b is shown, wherein the guide web 18 b is arranged above the push rod 24.

A second guide bar is disposed below the push rod 24 in a non-visible manner. The push rod 24 comprises a toothed segment 25, which is in engagement with a pinion 17. With the lifting pendulum movement of the push rod 24, the pinion 17 is set in a pendulum rotation. The pinion 17 is rotationally pressed onto the wiper shaft 13, so that the oscillating movement is transmitted to the wiper shaft 13. The guide bar 18b is connected to both the push rod 24 and the wiper shaft

13 rotatably connected, so that the guide web 18 b only serves for equidistant arrangement of the push rod 24 to the wiper shaft axis 12 and the toothing between the pinion 17 and the toothed segment 25 is maintained. The arrangement of the transfer gear, a pendulum rotational movement of the wiper shaft 13 can be generated by 180 °, for example. In this case, the drive motor 22 performs a continuous rotational movement in a fixed direction of rotation. The windshield wiper drive 1 further includes a housing cover 14, which has been removed in the present figure to represent the gear assembly 11. The housing cover 14 therefore encapsulates the illustrated gear assembly 11 within the transmission housing 10th

Figure 2 shows a side cross-sectional view of a windshield wiper drive. In this view, the area of the drive motor is not shown. The sectional plane of the illustration in FIG. 2 extends through the wiper shaft axis 12 as well as through the axis of rotation of the worm wheel 21. In the gear housing 10, there is a contact surface 15a formed, wherein opposite to the contact surface 15a in the housing cover 14, a stop surface 15b is provided. Thus, both contact surfaces 15a and 15b face each other. Between the two contact surfaces 15a and 15b, the gear assembly 11 is guided axially in the direction of the wiper shaft axis 12, wherein the gear assembly 11 is designed as a transfer gear. The between the

Run-up surfaces 15a and 15b guided components of the transfer gear comprise a guide web 18a adjacent to the gear housing 10 and a guide web 18b adjoining the contact surface 15b of the housing cover 14 and the pinion 17 arranged between the guide webs 18a and 18b. The height of the gear assembly 11 between the contact surfaces 15a and 15b corresponds to a mounting area 16, which at the same time includes the spacing of the two contact surfaces 15a and 15b.

The pinion 17 is pressed on a knurled area on the wiper shaft 13, so that the torque for driving the oscillating movement of the wiper shaft 13 is transferable. The housing cover 14 encapsulates the transmission housing 10 over the entire

Area of the gear assembly 11, and also takes over the function of the axial guidance means of the ring elevation 20, on the end face of the stop face 15b is formed. The ring elevation 20 is formed radially symmetrically about the wiper shaft axis 12, so that the two stop faces 15a and 15b each extend concentrically around the wiper shaft axis 12.

Figure 3 shows an arrangement of a transfer gear with a pinion 17 and a push rod 24, which are arranged by means of a guide web 18b equally spaced from each other. The push rod 24 has a toothed segment 25 which meshes in the toothing of the pinion 17. The toothed segment 25 extends around a

Angular range, which corresponds at least to the pendulum angle or the pivot angle of the push rod 24, so that in the pinion 17, a pendulum angle of up to 180 ° can be achieved. In the push rod 24, a bore is provided in the lower region, by means of which the push rod 24 is connected via a bolt connection with the worm wheel.

FIG. 4 shows a cross-section of a side view of the arrangement of the transfer gear according to FIG. 3. Here again, the pinion 17 is shown meshing with the toothed segment 25 of the push rod 24. The pinion 17 is connected via a press fit with the wiper shaft 13 axially and rotationally fixed, wherein the Press Association comprises a knurling. The guide webs 18a and 18b are respectively arranged adjacent to the left and right sides of the pinion 17 and rotatably received on the wiper shaft 13. Furthermore, the guide webs 18a and 18b are each arranged laterally adjacent to the push rod 24 and rotatably guided about a connecting pin 26. The pinion 17 and the guide webs 18a and 18b together form a mounting area

16, which extends from the first stop face 15a on the gear housing 10 to the second stop face 15b in the housing cover 14.

Figure 5 shows a windshield wiper drive 1 in a plan view, wherein the illustrated gear assembly 11 is designed as a crank mechanism. The gear arrangement 11 essentially comprises a lever element 19, which is arranged rotationally fixed on a wiper shaft 13 in order to initiate a pendulum movement in the wiper shaft 13, which is executable around a wiper shaft axis 12. The lever element 19 is in articulated connection with a push rod 24 which introduces the torque into the lever element 19. The pendulum lifting movement of the push rod 24 is caused by an articulated connection with a worm wheel 21, wherein the hinge connection between the worm wheel 21 and the lever member 19 eccentrically rotates about the axis of rotation of the worm wheel 21. The worm wheel 21 is driven by a drive motor 22, wherein the drive motor 22 performs a continuous rotational movement in a fixed direction of rotation and the

Worm wheel 21 via a worm 23 drives.

FIG. 6 shows the windshield wiper drive 1 according to the embodiment in FIG. 5 with a crank mechanism in a cross-sectional side view. In the gear housing 10, a gear assembly 11 is inserted and with a

Housing cover 14 closed. The wiper shaft 13, which rotates about the wiper shaft axis 12, firstly projects from the transmission housing 10 on the left side, the wiper shaft 13 projecting into the interior of the transmission housing 10 on the right side. On the wiper shaft 13, the lever element 19 is pressed against rotation at the end. The lever member 19 has a mounting portion 16 which extends from the first

Run-up surface 15a on the gear housing 10 extends to the second contact surface 15b in the housing cover 14. The contact surface 15b in the housing cover 14 is formed by a ring lift 20, which is arranged around the wiper shaft axis 12 around. By each adjacent arrangement of the contact surface 15a of the gear housing, the lever member 19 and the contact surface 15b in the housing cover 14, the gear assembly 11 is guided axially, wherein furthermore the wiper shaft 13 is arranged axially fixed between the gear housing 10 and the housing cover 14.

FIG. 7 shows the components of the crank mechanism which comprise the lever element 19 and the push rod 24. Since the lever member 19 is rotationally and axially fixed pressed on the wiper shaft 13, the torque for generating a pendulum motion about the wiper shaft axis 12 around by the lever member 19 can be applied. The lever member 19 is pivotally connected to the push rod 24, which performs a pendulum stroke movement, which is generated by the articulated connection with the worm wheel.

FIG. 8 shows a cross-section through a side view of the components of the crank mechanism from FIG. 7. In the area of the wiper shaft 13, a mounting region 16 is formed, whereby the height of the lever element 19 in the area of the connecting bolt 26 is reduced in order to minimize the overall height of the gear arrangement. The lever member 19 is pivotally connected by means of the connecting pin 26 with the push rod 24.

The invention is not limited in its execution to the preferred embodiment given above. Rather, a number of variants is conceivable, makes use of the solution shown even with fundamentally different types of use.

Claims

claims

1. Windscreen wiper system with a windshield wiper drive (1), in particular for rear window wiper of a motor vehicle, with a by means of a housing cover (14) closable gear housing (10) for receiving a gear assembly (11), wherein the transmission housing (10) and the housing cover (14) respectively a contact surface (15a, 15b) for axial guidance of the gear arrangement (11), characterized in that for receiving various gear arrangements (11) with the housing cover (14) closed between the opposite

Run-up surfaces (15a, 15b), a gap (16) is formed, which corresponds to the geometric dimensions of a provided on the gear assembly (11) mounting area (16), wherein the installation area (16) of the various gear arrangements (11) is uniform.

2. Windscreen wiper drive (1) according to claim 1, characterized in that the gear arrangement (11) comprises a transfer gear or a crank gear.

3. Windscreen wiper drive (1) according to claim 2, characterized in that the transfer gear has a on the wiper shaft (13) pressed-on pinion (17) and an upper and lower respectively to the pinion (17) adjacent guide web (18 a, 18 b), wherein the installation area (16) is formed by the height of the pinion (17) and the guide webs (18a, 18b).

4. windshield wiper drive (1) according to claim 2, characterized in that the crank gear on the wiper shaft (13) pressed-lever element (19), wherein the installation area (16) by the height of the lever element (19) is formed.

5. Windscreen wiper drive (1) according to one of the preceding claims, characterized in that the wiper shaft (13) is mounted in a in the transmission housing (10) introduced guide bore, and the gear housing (10) formed contact surface (15 a) through the end face of in the transmission housing (10) opening guide bore is formed so that the wiper shaft (13) through the contact surface (15 a) extends therethrough.

6. Windscreen wiper drive (1) according to one of the preceding claims, characterized in that the housing cover (14) formed contact surface

(15b) is formed by the end face of a ring lift (20) formed radially around the wiper shaft axis (12) in the inside of the housing cover (14).

7. windshield wiper drive (1) according to one of the preceding claims, characterized in that by the inside of the gear housing (10) and the housing cover (14) enclosed space for the gear assembly (11) is geometrically such that the operation of the gear assembly ( 11) is collision-free executable both in training as a conversion gear and as a lever mechanism.

8. Windscreen wiper drive (1) according to one of the preceding claims, characterized in that the wiper shaft (13) is guided axially in the direction of the wiper shaft axis (12) by means of the stop surfaces (15).

9. windscreen wiper drive (1) according to one of the preceding claims, characterized in that the transfer gear and the lever mechanism a

Schneckerad (21), wherein the worm wheel (21) of the transfer gear and the lever mechanism has a mutually identical shape.

10. Windscreen wiper drive (1) according to one of the preceding claims, characterized in that the windshield wiper drive (1) comprises a drive motor (22) with a worm (23), wherein the drive motor (22) and the worm (23) for driving the Umsetzgetriebes or the lever mechanism have a mutually identical shape.