Rotary shafts – gudgeons – housings – and flexible couplings for ro – Overload release coupling – Torque transmitted via frictional engagement of conical or...
Reexamination Certificate
1997-04-04
2001-09-04
Browne, Lynne H. (Department: 3629)
Rotary shafts, gudgeons, housings, and flexible couplings for ro
Overload release coupling
Torque transmitted via frictional engagement of conical or...
Reexamination Certificate
active
06283863
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention concerns a drive unit, and more particularly concerns a drive unit having a housing, gearing, shaft, actuator, and slip clutch.
In the case of a conventional drive unit of the usual type, there is provided an electric motor with a multi-step, RPM reducing drive enclosed in one housing. Between a drive shaft from the stepped down transmission and a driven component designed as a rotary actuator, a slip clutch is inserted which is comprised of several disks, i.e., a disk clutch. The disks are pressed together by a screw compressed spring, which, on the one side presses against the disks, and on the other side against the head of a screw, which is threadedly engaged in the drive shaft facility.
Motor-gear drive-units of this kind are installed for the activation of external mirrors on motor vehicles and particularly on trucks. The slip clutch is necessary so that the motor vehicle mirror, which is usually positioned by the motor driven actuator, can be also set by hand. The step-down gear drives are, naturally, self limiting.
The sliding moment, by the overstepping of which the frictional connection of the slip clutch is overcome, is not exactly defined, but varies within a non-reproducible range. In the case of a rotary movement contrary to the normal rotation, the screw will loosen itself, whereby the clutch will fail to hold. Moreover, there is a high cost of installation related to the many parts which must be handled.
OBJECTS AND SUMMARY OF THE INVENTION
Thus the present invention has the fundamental purpose of creating a drive unit for this general application which is comprised of few parts, is simple to install, and exhibits a very exact, predictable slip moment. This purpose will be achieved by means of the features of the claimed invention.
By means of the measures taken in accord with the invention, the achievement has been gained, that on conical frustum shaped friction surfaces, a very exact, definable friction moment is given, so that in turn, also a very exact, definable slip moment is available, thus, inside the tolerance limits within which the slip clutch operates, the moment is generally constant.
Additional objects and advantages of the invention will be set forth in part in the following description, or may be obvious from the description, or may be learned from practice of the invention.
Further features, advantages and details of the invention are to be gained from the following description of an embodiment with the assistance of drawings.
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Lang Heinrich
Seiboth Wolfgang
Binda Greg
Browne Lynne H.
Dority & Manning P.A.
Mekra Lang GmbH & Co. KG
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