EP1539547A1

EP1539547A1 - Wiper system

Info

Publication number: EP1539547A1
Application number: EP03709619A
Authority: EP
Inventors: Thomas Weigold; Jan Dietrich; Armin Stubner; Claus Fleischer; Orlando Gabriel De Dias; Johannes Moosmann; Hartmut Krueger
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2002-09-12
Filing date: 2003-02-18
Publication date: 2005-06-15
Also published as: DE10242304A1; JP2005537984A; KR20050045998A; US20040216257A1; WO2004026643A1; BR0306299A

Abstract

The invention relates to a wiper system, particularly for a motor vehicle, comprising a drive motor and at least one gear mechanism, which drives at least one wiper arm, whereby the at least one gear mechanism is equipped with at least one device for arresting the at least one gear mechanism, and the at least one gear mechanism has a gearing worm (42, 52, 64) in which a toothed wheel (20, 30) engages.

Description

Seheibenwischvσ direction

DESCRIPTION

The invention relates to a windshield wiper device, in particular for a motor vehicle, with a drive motor and at least one transmission which drives at least one wiper arm.

1 shows a windshield wiper device 10 known from the prior art. A drive motor 11 drives a wiper arm 16 via a gear transmission 12 and a crank 13, which is connected by means of a coupling 14 to a rocker arm 15, on which a Wiper blade 17 is attached ^' . A disadvantage of the gear transmission 12 is that it is not self-locking, so that it could also be moved by moving the wiper arm 16 if the crank 13, the coupling 14 and the rocker arm 15 were not connected between the wiper arm 16 and the gear transmission 12 , The crank 13, together with the coupling 14 and the rocker 15, serves to convert the rotary movement of the gear transmission 12 into a pendulum movement, as a result of which the wiper blade 17 can move back and forth on the vehicle window. When the two reversal points of the wiper blade 17 on the vehicle window are reached, the crank 13 and the coupling 14 are aligned in a line, so that no torque can be exerted on the crank 13 by moving the wiper blade 17, and the wiper blade 17 by an external one Force can not be pivoted from its current position. This is particularly desirable when the wiper blade is in its parked position, that is when the wiper device is not in operation and that Wiper blade should be kept stable in its parking position when subjected to external force, for example at high vehicle speeds, through which a high wind force acts on wiper blade 17. Instead of the combination of a crank 13 and a rocker 15 for converting the rotating movement into a pendulum movement, a reversing motor is often also used, which periodically changes its direction of rotation in accordance with the pendulum movement of the wiper blade. Thus, when using a reversing

10 motor on the combination of the crank 13 and the rocker 15 are dispensed with. The disadvantage here, however, is that the wiper blade can then be easily adjusted by external forces, since the frictional forces of the gear transmission and the drive motor are too low to be applied

15 compensate the external forces acting on the wiper blade.

The object of the invention is to improve a windshield wiper device of the type mentioned at the outset such that even if a combination of a cure and / or 20th rocker is omitted, the wiper blade is held securely in its parking position when external forces act on the wiper blade.

The invention achieves the object by a divorce 25 benwischvorrichtung, in particular for a motor vehicle, with a drive motor and at least one gear, which drives at least one wiper arm, wherein - ^'the means for inhibiting the at least one transmission equipped with at least a transmission with at least is. Thus, in future the wiper blade can be in its parking position even when using a reversing motor or if a crank connected downstream of the gearwheel gear and the associated coupling are not aligned in one line in the parking position of the wiper blade, even with large ones on the wiper blade. leaf-acting external forces are held securely in its parking position.

The at least one device for inhibiting the at least one gear can be implemented very easily if the at least one gear has a gear worm in which a gearwheel engages and the gearwheel has a projection on at least one end face. In the parked position, this projection can rub against the gear housing or another non-rotating part within the gear housing, for example, so that these frictional forces counteract the external force acting on the wiper blade and thus prevent the wiper blade from pivoting undesirably.

The gear housing can also have a projection which, in the parked position of the at least one wiper arm, forms a non-positive connection with the projection on the gearwheel. Such projections attached to the gearwheel and gearbox housing can be implemented very simply in terms of construction. They do not require any additional parts on the wiper motor, so that no additional assembly and logistics work is necessary in the manufacture of the motor.

It is also possible for the at least one wiper arm to have a projection which, in the parking position of the at least one wiper arm, produces a non-positive connection. This geometry required for the non-positive connection in the vicinity of the at least one wiper arm can be produced, for example, in a very simple constructive manner in the water drain of the vehicle, so that the friction generated by the protrusion in the parking position also wipes the wiper arm when external forces act on the wiper blade holds securely in its parking position. With this- ser variant has the transmission, particularly the combination of crank and coupler, ^'not mounted in a particular location and are delivered, is cheaper whereby the transmission in its manufacture. In addition, no additional parts are required on the wiper motor. In this variant, the non-positive connection is advantageously further away from the drive shaft of the wiper arm, so that a relatively low frictional force is required in order to generate the necessary counter-torque which counteracts the torque generated by the external force acting on the at least one wiper blade. The lower frictional force consequently also results in less frictional wear. The larger the friction surface is designed, the lower the normal force acting on the friction surface.

If, in the parking position of the at least one wiper arm, the teeth of the gearwheel engaging in the gear worm have an increased material order on their tooth flanks, in the parking position between the gear worm and the gearwheel engaging in the gear worm there is increased friction, which causes an undesired pivoting of the wiper arm the parking position prevented. The additional material application on the tooth flanks is structurally very simple to implement and does not require any additional parts on the wiper motor, so that here too, additional assembly and logistics expenditure in the manufacture of the motor can be eliminated.

The gearwheel engaging in the gear worm can have a recess on its periphery, into which a locking element engages in the park position. The required torque, which swivels the wiper arm out of the parking position, can be if the locking element is an angular one Hook is formed, can be adjusted very easily via the angle of the hook. If the angle is relatively acute, the required torque is relatively high, if the angle is obtuse, the required torque is lower. This variant can be used not only on the gear wheel, but on all rotating parts of the windshield wiper device.

The locking element can be carried out very easily if it is a spring element. The spring element can be manufactured very easily as a stamped and bent part and can also be assembled very easily, for example by snapping it into the gear housing. With a corresponding design, the stamped and bent part can also serve as a safety stop in one direction of rotation. By prestressing the spring element, the required torque, which has to be applied in order to pivot the wiper arm out of its parking position, can be changed.

^• the at least one means for inhibiting the at least one transmission, a preferably co-operating with a gear worm gear, said gear along a portion of its periphery has a recess on the gespännt a spring member having a protruding in AXI aler direction of the projection, is, and the projection can engage in a locking device. The at least one device for inhibiting the at least one transmission can thus be installed in an already existing or already used transmission housing. In addition, no additional moving parts are required compared to the known gearboxes without a device for inhibition. The construction of this device for inhibiting the at least one transmission can be carried out both with left-handed and with right-handed drives realize without additional effort. It also makes no difference whether the gearbox is located to the left or right of the drive.

If the locking device has a stop against which the axial projection of the spring element abuts when the wiper arm reaches the park position, the stop prevents the wiper arm from pivoting out of the park position undesirably by a positive fit.

In order to allow the windshield wiper device to be locked and unlocked smoothly, the locking device can be provided with inclined sliding surfaces.

The device for inhibiting the at least one transmission can be implemented particularly simply and inexpensively if the locking device is arranged on the transmission housing.

The gear worm can have a polygon on one end face against which a spring element presses in the parking position of the at least one wiper arm. The pressure of the spring element against the polygon causes the gearbox to be inhibited so that the wiper arm cannot be swiveled out of its parking position by external force. Furthermore, the spring element braces the gear worm and any motor armature that may be connected to it in the bearing parts, so that the bearing friction thereby increases and an undesired pivoting of the wiper arm out of the parking position is additionally prevented. Since such worm gears in windshield wiper devices generally have a gear ratio of approximately 50: 1 to 70: 1 and the escapement of the worm gear multiplied by the gear ratio Inhibition of the drive shaft of the wiper arm results, the inhibition of the worm gear can be correspondingly low to prevent the wiper arm from undesired pivoting.

In a structurally very simple way, the force acting on the polygonal spring element allows the gear ^'or fastened to the transmission housing.

Some exemplary embodiments are explained in more detail below with reference to the accompanying drawings.

Show in detail:

Fig. 1 a known from the prior art

Windshield wiper device, -

2 shows a first embodiment of a device for inhibiting a transmission;

3 shows a second embodiment of a device for inhibiting a transmission;

Fig. 4 shows a third embodiment of a Einrich- ^• processing for inhibiting a transmission;

5 a shows a fourth embodiment of a device for inhibiting a transmission before its activation of the inhibition,

5 b shows the fourth embodiment of the device for inhibiting the transmission in the activated state; 6 a shows a fifth embodiment of a device for inhibiting a transmission when it is activated;

Fig. 6 b, the fifth embodiment of the device for inhibiting the transmission after its activation.

7 a shows a view of the end face of a gear wheel of a sixth embodiment of the

Device for inhibiting the transmission;

7 b is a plan view of the gear from FIG.

7a;

8 a is a plan view of a locking device of the sixth embodiment of the device for inhibiting the transmission;

8 b shows a side view of the locking device from FIG. 8 a;

9 a is a plan view of the sixth embodiment of the device for inhibiting the transmission during locking;

9 b shows a side view of the sixth embodiment of the device for inhibiting the transmission during the locking;

Figure 10 a is a plan view of the sixth embodiment of the device for inhibiting the transmission during unlocking. 10 b shows a side view of the sixth embodiment of the device for inhibiting the transmission during unlocking;

11 a is a top view of the sixth embodiment of the device for inhibiting the transmission in a more advanced stage of unlocking;

Fig. 11 b is a side view of the sixth embodiment of the device for inhibiting the transmission in a more advanced stage of unlocking.

Fig. 2 shows a gear 20 which engages in a gear worm, not shown here. The gear wheel 20 has teeth 21 and teeth 22. The teeth 22 are provided with an increased material application in the area of their flanks 23. The gearwheel 20 is in the parked position of the wiper arm with its teeth 22 in engagement with the gear worm (not shown here). Due to the increased material application on the flanks _. 23 creates an increased friction between the gear 20 and the worm gear in the park position. This increased friction prevents an external force acting on the wiper blade from pivoting the wiper blade out of its parking position.

Fig. 3 shows a gear 30, which also cooperates with a worm gear not shown here. The gearwheel 30 has a projection 31 which rubs against a projection 32 attached to a gear housing 33. This friction prevents the wiper blade from being swiveled out of its parking position by external forces. The projection is advantageously 31st only in the area on the gear 30 which is opposite the projection 32 in the parked position of the wiper blade. The projections 31 and 32 are structurally very easy to implement and do not require any additional parts on the wiper motor. The larger the friction surfaces of the projections 31 and 32, the lower the normal force that is also required for the friction, so that the bearing of the gear 30 does not have to absorb any significant stresses in its axial direction.

FIG. 4 shows a gear housing 40 in which a gear 41 is arranged which engages in a gear worm 42. The gear worm 42 is connected to a shaft 43 which is driven by a motor (not shown here). The gearwheel 41 has a recess 44 on its periphery, in which a latching element 45 engages. The latching element 45 is advantageously designed as a spring element, which is connected to the gear housing 40, for example by latching. As soon as the locking element 45 engages in the recess 44, it prevents the gearwheel 41 from rotating when a force acts on the wiper arm from the outside. The wiper arm can thus be prevented from undesired pivoting due to external force.

The figures 5a and 5b show a gear worm 52 which interacts with a gearwheel 50 designed as a gearwheel segment. The gear worm 52 is driven via an armature 53 connected to it, which belongs to a motor drive. Consequently, the gear wheel 50 is rotated by the gear worm 52, whereby a wiper arm connected to a shaft 51 is driven. A polygon 54 connects to the gear worm 52. When the wiper arm moves towards its parking position, it moves Gear 50 with a spring element 55 arranged thereon toward the polygon 54. As soon as the wiper arm has reached its parking position, the spring 55 is pressed against the polygon 54, as a result of which the wiper arm in its parking position is prevented from pivoting, which is caused by an external force acting on the wiper arm (see FIG. 5b). , By pressing the spring element 50 against the polygon 54, the bearing points of the armature 53 are also tensioned, so that the bearing friction in the tensioned bearing points is increased, as a result of which the wiper arm is additionally inhibited against undesired pivoting of the wiper arm. As soon as the wiper arm is moved out of its parking position by the drive, the spring element moves away from the polygon 54 so that it relaxes again. This device for inhibiting the wiper arm is particularly advantageous when the wiper arm is driven by a reversing drive. The angle 56 shows the reversing angle by which the gearwheel 50 swings back and forth during operation of the windshield wiper device.

The figures 6 a and 6 b show a further embodiment based on the device for inhibiting the wiper arm, as shown in FIGS. 5 a and 5 b is shown. However, in FIGS. 6 a and 6 b, a spring element 60 is not arranged on a gear 61, but on a gear housing, not shown here. Furthermore, an actuating cam 62 is arranged on the gear 61, which during movement, .des. Wiper arm presses into the parking position against the spring element 60 and consequently presses the spring element 60 against a polygon 63 as soon as the parking position is reached (see FIG. 6 b). As soon as a motor driving a worm wheel 64 moves the wiper arm out of its park position again, the actuating cam 62 is guided upwards along the spring element 60, whereby the spring element ment 60 is relaxed. An angle 65 corresponds to the reversing angle by which the gearwheel 61 swings back and forth during operation of the windshield wiper device.

The figures 7 a, 7 b, 8 a and 8 b show a gear 70 and a locking device 80 cooperating therewith of another embodiment for inhibiting the transmission. The gearwheel 70 has a gearwheel body 71 which is provided with an axis 72. Along part of the periphery of the toothed wheel 70, the latter is equipped with a spring element 73, the spring element 73 being tensioned via a recess 74. A projection 76 is attached to the spring element 73 and extends in the direction of the axis 72. Along the other part of the periphery of the gear 70 there is a toothing 75, which preferably interacts with a gear worm (not shown here). The locking device 80 is preferably arranged above the gearwheel 70 on the gear housing, which is not shown here. It has slanted sliding surfaces 81, 82 and 84 and sliding surfaces 85 and 86. The inclined sliding surface 81 merges into a stop 83 at one end. Holes 87 serve to receive connecting means in order to fix the locking device 80 to the gear housing.

The figures 9 a and 9 b show the locking process in order to lock the gearbox when the wiper arm has reached the parking position. The spring 73 and the projection 76 are shown here schematically in different positions during the locking process. During the locking process, the projection 76 moves in the direction of the arrow 90. The projection 76 slides along the oblique sliding surface 81, so that the spring element 73 is tensioned in the axial direction (FIG. 9 a). At the same time, the glides Projection 76 along the oblique sliding surfaces 82, whereby the spring element 73 is tensioned in the radial direction (FIG. 9 b). After the wiper arm has reached its parking position, the projection 76 reaches the stop 83 at the end of the oblique sliding surface 81. The projection 76 then leaves the oblique sliding surface 81, so that the projection 76 snaps back in the axial direction, so that the spring element 73 snaps axially Relaxed direction. By snapping back the spring element 73 in the axial direction, the toothed wheel 70 is prevented from moving back against the locking direction by the stop 83, so that an undesired pivoting of the wiper arm out of the park position is excluded. In the locked state, the spring element 73 remains tensioned in the radial direction.

To unlock the locked state, the gear 70 with the projection 76 is first moved again in the direction of the arrow 90 (FIGS. 10 a and 10 b). The projection 76 slides along the sliding surface 85. After the end of the sliding surface 85 is reached, the projection 76 snaps back, so that the spring 73 is relaxed in the radial direction (Fig. 10 b). Then the direction of rotation of the gear 70 is reversed so that the projection 76 moves in the direction of the arrow 110 (FIGS. 11 a and 11 b), which is opposite to the direction of the arrow 90. During the unlocking process, the projection 76 slides along the inclined sliding surface 84, the spring element 73 being tensioned in the axial direction and thus being guided past the stop 83. After the projection 76 has reached the end of the inclined sliding surface 84, it slides along the sliding surface 86. After reaching the end of the sliding surface 86, the projection 76 snaps back in the axial direction, the spring element 73 moving axially Relaxed direction (Fig. 11 a). The gear 70 is then no longer in contact with the locking device 80.

Claims

1. Windshield wiper device, in particular for a motor vehicle, with a drive motor and at least one gear that drives at least one wiper arm, characterized in that the at least one gear is equipped with at least one device for inhibiting the at least one gear.

2. Windscreen wiper device according to claim 1, characterized in that the at least one gear has a gear worm (42, 52, 64) into which a gear (20, 30) engages, and the gear (20, 30) a at least one end face Has projection (31).

3. Windshield wiper device according to claim 2, characterized in that a housing (33) surrounding the transmission also has a projection (32) 'which, in' the parking position of the at least one wiper arm with the projection (31) on the gearwheel (30) forms a positive connection.

4. Windshield wiper device according to one of claims 1 to 3, characterized in that in a parking position of the at least one wiper arm, teeth (22) of the gearwheel (20) engaging in the worm gear have an increased material application on their tooth flanks (23).

Windscreen wiper device according to one of claims 1 to 4, characterized in that the at least one wiper arm has a projection which in the Parking position of the at least one wiper arm generates a non-positive connection.

6. Windshield wiper device according to one of claims 1 to 5, characterized in that the gearwheel (41) engaging in the gear worm (42) has on its periphery a recess (44) into which a latching element (45) engages in the parking position, or that the gear wheel (41) has on its periphery a latching element (45) which, in the parking position, engages in a recess (44), which is arranged in particular in a fixed manner in the gear housing.

7. Windscreen wiper device according to claim 6, characterized in that the latching element (45) is a spring element.

8. Windshield wiper device according to one of claims 1 to 5, characterized in that it has a preferably with a gear worm cooperating gear (70), the gear (70) along a part of its periphery has a recess (74) over which a spring element (73), which has a projection (76) projecting in the axial direction, is tensioned, and the projection (76) can be engaged in a locking device (80).

9. Windscreen wiper device according to claim 8, characterized in that the locking device (80) has a stop (83).

10. Windshield wiper device according to claim 8 or 9, characterized in that the locking device (80) is provided with inclined sliding surfaces (81, 82, 84).

11. Windshield wiper device according to one of claims 8 to 10, characterized in that the locking device (80) can be arranged on the gear housing.

12. Wiper device according to one of claims 1 to 11, characterized in that the gear worm (52, 64) on ^'an end face of a polygon (54, 63) against which in the park position of the at least one wiper drive a spring element (55 , 60) presses.

13. Windscreen wiper device according to claim 12, characterized in that the spring element (55, 60) on the gear (50, 61) or on the gear housing is attached.