Brushing – scrubbing – and general cleaning – Attachments – Optical-member-attachable cleaner
Patent
1994-11-23
1996-12-31
Graham, Gary K.
Brushing, scrubbing, and general cleaning
Attachments
Optical-member-attachable cleaner
1525034, 310 89, 310 83, B60S 108, B60S 134
Patent
active
055881734
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
Field of the Invention
The invention relates to a windshield wiper system with a pivotably support wiper arm and a drive that swivels the wiper arm, the drive having a reversible electric motor mounted solidly to the vehicle and a control unit that switches the electric motor.
The windshield wiper systems are typically driven by an electric motor whose direction of rotation is converted, via a gear and a crank into a back-and-forth motion of the wiper arm. Each crank drive is designed for a certain wiping angle, and adaptations to changing environmental and operating conditions are hardly possible, or can be achieved only at major expense. Yet a windshield wiper system should be adapted to a relatively large number of different parameters, some of which cannot be made even to agree with one another, which would include for instance the wiper speed, the size of the field swept by the wipers, the parking position, the friction of the wiper blade on the wind shield, acceleration and deceleration values in the reversal region, and so forth. To avoid an overload from snow and the like, DE-A 41 04 565 discloses a wiper system of the type referred to at the output, in which a premature reversal of motion occurs if an overload is ascertained.
SUMMARY OF THE INVENTION
It is therefore the object of the invention to improve a windshield wiper system further, and in order to better meet the existing demands, it proposes that the electric motor has a two-part housing, both parts of which are rotatable relative to one another, and that a first housing part includes the stator portion of the electric motor and is mountable solidly to the vehicle, and the second housing part includes the rotor portion and is connected to the wiper arm.
The use of a two-part housing for the reversible electric motor has constructional advantages above all, since the second housing part driven by the motor can be associated directly with the wiper arm. Components such as crank drives, mounts and the like become unnecessary, saving space, and the assembly is simplified.
In a first embodiment, it is provided that connected to the second housing part is a bearing sleeve, which is supported on a supporting lug that is disposed on the housing part that is solidly mounted to the vehicle. As a result, the drive mechanism and wiper arm support form a simple, easily mounted structural unit. In a preferred embodiment, the housing part mountable solidly to the vehicle is embodied as cup-shaped, and the second housing part that is provided with the rotor portion is embodied as lidlike. In that case, the cup wall preferably has the stator portion of the electric motor.
The windshield wiper system becomes especially compact if the stator portion is provided on the supporting lug, and the second housing part is embodied as cup-shaped and forms an outer rotor portion, or if the motor power take-off shaft forms the bearing sleeve of the wiper arm. In both embodiments, the motor surrounds the supporting lug, which is fixed to the base body.
If the motor power take-off shaft is not the bearing sleeve of the wiper arm, then a further preferred embodiment provides that an intermediate gear is embodied between the motor power take-off shaft and the bearing sleeve. With respect to the pivoting angle of the wiper arm, the rotational angle of the electric motor becomes greater as a result in the gear ratio of the intermediate gear, and can be adjusted more exactly. This gear may be a spur gear, preferably a planetary gear. Moreover, the requisite drive moment of the electric motor decreases, so that the motor can be made smaller. A space-saving accommodation can be attained if the cup wall of the housing part that is mountable solidly to the vehicle, or the outer rotor portion, is provided with the ring gear of a planetary gear, and the second housing part has a supporting flange for the planet wheels.
A further embodiment provides that the supporting lug is disposed axially adjustably on the housing part that is mountable solidly
REFERENCES:
patent: 3070733 (1962-12-01), Ziegler
patent: 3978542 (1976-09-01), van Eekelen
patent: 4405887 (1983-09-01), Tamura et al.
patent: 4665488 (1987-05-01), Graham et al.
patent: 4866357 (1989-09-01), Miller et al.
Graham Gary K.
Greenberg Laurence A.
Lerner Herbert L.
Stemer Werner H.
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