DE2340550A1 - WIPERS, IN PARTICULAR FOR VEHICLES - Google Patents

Description

SVF special factory for car accessories, Gustav Hau £ .m.b.H., 712 Bietigheim

A 12 184

pat / j / vo / m 6.S.1973

Windshield wipers, in particular for motor vehicles

The invention relates to a windshield wiper with a wiper arm, with one attached to one end of the wiper arm Wiper blade, with a swivel arm - which is rotatably attached at one end to the other end of the wiper arm, with a with the other end of the swivel arm firmly connected output shaft, with a device for guiding the wiper arm or the wiper blade in such a way that a rectangular wiped field is created, and with one the output shaft in oscillating rotary motion setting drive device, which has a wiper motor, a crank drive and a with the output shaft Has firmly connected gear, in particular for motor vehicles.

Such windshield wipers are known from DT-OS 2 115 576 and 2 132 k96 .

In the known windshield wiper according to DT-OS 2 II5 57 <>, the device for guiding the wiper arm and the wiper blade consists of a planetary gear that pivots the wiper arm during the pendulum movement of the pivot arm around the output shaft and the movement of the wiper arm in its longitudinal direction and the wiper blade is adjusted in parallel via a guide arm · In the case of the windshield wiper * according to DT-OS 2 132 Λ96, the device for guiding the wiper arm and the wiper blade instead of the planetary gear consists of a

50980970458

- 2 - A 12 184

a toothed belt or chain drive. In these two windshield wipers, the drive device has a wiper motor with a drive crank, a drive rod operated by the drive crank, a toothed segment with external toothing that can be set in pendulum motion by the drive rod via a cross-link and a toothed segment that is firmly connected to the output shaft and that meshes with the toothed segment Tooth wheel, on. Such a drive device takes up a relatively large amount of space and requires a correspondingly large housing.

The object of the invention is to address a windshield wiper of the type mentioned at the outset, in which the drive device is more closely grouped and only requires a small housing. According to the invention, this is achieved by that a coupling rod is hinged to the crank pin of the crank drive, which is firmly connected to a toothed segment is that the toothed segment is rotatably mounted in its pivot point at one end of a rocker, that the other The end of the rocker arm is rotatably mounted around a stationary bearing pin and that two are firmly connected to one another on the bearing pin connected, unequal sized intermediate gears are stored, of which the smaller with the tooth segment and the larger is in engagement with the gear of the output shaft. Due to the oscillating gear segment and the translation with the intermediate gears a narrow design of the drive device is achieved, so that only a small housing for the drive device is needed.

For reasons of stability, the rocker exists according to another Formation of the invention from two rods arranged one above the other, between which on the one hand the intermediate gears lie and on the other hand, the toothed segment is arranged.

The rods can preferably be mounted on annular projections of the intermediate gear wheels. For the sake of simplicity,

- 3 - A 12 184

which the intermediate gears are integrally formed; the coupling rod and the toothed segment are also preferably made in one piece educated.

According to a further embodiment of the invention, a tight construction of the drive device is supported in that the crank drive is formed by a rotatably mounted worm wheel with an eccentrically arranged crank pin and that the worm wheel meshes with a worm with which one end of the shaft of the wiper motor is provided is.

The invention is explained in more detail using an exemplary embodiment. Show it

1 shows a plan view of a drive device for a windshield wiper according to of the invention with the upper part of the housing removed, "

2 shows a section through the drive device along the section line II-II in Fig. 1, the upper part of the housing is shown and the worm wheel with its crank pin in the cutting line is rotated, and.

Pig 3 shows a section through the drive device along the section line HI-III in Fig. 1, with the upper part of the housing is shown.

The drive device shown in Figs. 1 to 3 is in housed a housing, which consists of a motor housing part 10, a part of the motor housing at the same time

-U-

0 9 8 0 9/0458

■ - h - A 12 184

and, to the motor housing part 10 fasten the lower housing part 11 and an upper housing part 12 (FIGS. 2, 3) fastened to the lower housing part 11. The shaft of the wiper motor accommodated in the motor housing part is provided at one end with a short worm 13 (FIG. 1) which meshes with a worm wheel I ^ rotatably mounted in the lower housing part 11. A coupling rod 16 is articulated eccentrically on the worm wheel 1 * 1 by means of a crank pin 15 and forms a component in one piece with a toothed segment 17. The toothed segment 17 is rotatably mounted in its pivot point 18 at one end of a rocker 19, which consists of two rods 20, 21 (Pig. 3) arranged one above the other. These rods are rotatably mounted with their other ends on annular lugs 22, 23 of two intermediate gear wheels 2h, - 25, which in turn are rotatably mounted on a bearing pin 2.6 . These two intermediate gears are of different sizes and can be made in one piece. The bearing bolt 26 can be injected or riveted into the lower housing part 11 as a stud bolt. The smaller intermediate gear 25 meshes with the toothed segment 17, while the larger intermediate gear 2h meshes with a gear 27. The gear wheel 27 is firmly connected to an output shaft 28 which is rotatably supported on the one hand in the lower housing part 11 in a bearing 29 and on the other hand in the upper housing 12 in a bearing 30. The end of the output shaft 28 protruding from the housing is provided with a knurled cone 31 on which the pivot arm, not shown, can be fastened. This swivel arm carries the wiper arm, also not shown, at its other end. Part of the device (not shown) for guiding the wiper arm and the wiper blade is formed by a sun gear 32 (FIG. 3) which is arranged concentrically to the output shaft 28 and which is provided with a ring gear 33.

50980

- 5 - A 12

As can be seen from the figures, when the wiper motor is running, the toothed segment 17, which is rotatably attached to the rocker 19, is set in an oscillating rotary movement and a sliding movement via the worm 13 »the worm wheel i4 and the coupling rod 16, with the intermediate gears 25, Zh and the gear 27, the output shaft 28 is also set in an oscillating rotary motion. The angle of rotation from one to the other reversal position of the output shaft 28 can be 390, for example. As can also be seen, the drive device takes up little space - so that only a small housing is necessary. A favorable drive movement is also achieved with such a drive device.

- 6 509809/0458

Claims (6)

- 6 - A 12 pat / j / vo / m 6/8/1973 Expectations μ] Windshield wiper with a wiper arm, with a wiper blade attached to one end of the wiper arm, with a swivel arm that is rotatably attached at one end to the other end of the wiper arm, with an output shaft firmly connected to the other end of the swivel arm, with a device for guiding the wiper arm or the wiper blade in such a way that a rectangular wiping field is created, and with a drive device which sets the output shaft in oscillating rotary motion and which has a wiper motor, a crank drive and a gearwheel firmly connected to the output shaft, especially for motor vehicles, characterized indicates overall that the crank drive a coupling rod to the crank pin (15) (i6.) is angej.enkt that determines ■ it a toothed segment (i7) is connected, that the toothed segment in its fulcrum on the one end of a rocker arm (1 °) is rotatably mounted, so that the other end of the rocker arm (1 °) can be rotated about a stationary bearing pin (26) is stored and that two firmly connected, unequal sized intermediate gears (2 * 1, 25) are mounted on the bearing pin, of which the smaller (25) ■ it the tooth segment (17) and the larger {zh) with the gear. (27) the output shaft is engaged - 7 ή 509809/045/8 - 7 - A 12 184 2. Windshield wiper according to claim 1, characterized in that the rocker arm (19) consists of two arranged one above the other Rods (2O, 21), between which on the one hand the Intermediate gears (2 ^, 25) lie and on the other hand that Toothed segment (17) is arranged. 3 windshield wiper according to claim 2, characterized in that that the rods (20, 21) on annular lugs (22, 23) of the intermediate gears are mounted. k. Windshield wiper according to one of Claims 1 to 3 »characterized in that the intermediate gear wheels {2k, 25) are designed in one piece. 5. Windshield wiper according to one of Claims 1 to h, characterized in that the coupling rod (16) and toothed segment (17) are constructed in one piece. 6. Windshield wiper according to one of claims 1 to 5 »characterized in that the crank drive is rotatably mounted Worm wheel (i4) with an eccentrically arranged Crank bolt (15) is formed and that the worm wheel is in engagement with a screw (13) with which one end of the shaft of the wiper motor is provided. 509809/0458 Blank page