Machine element or mechanism – Mechanical movements – Rotary to rotary
Patent
1982-01-21
1985-03-19
Staab, Lawrence J.
Machine element or mechanism
Mechanical movements
Rotary to rotary
74190, 74199, 74211, 74793, 74804, F16H 2112, F16H 2148, F16H 2508, F16H 1500
Patent
active
045051631
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a mechanism with continuous adjustment for the transmission of a rotary motion between an input shaft and a coaxial output shaft comprising a first concentric wheel integral with the casing and having two first wheel rims with first conical transmission surfaces, the axial distance between said two rims being adjustable, further comprising a ring with conical surfaces running on said first transmission surfaces, said ring being rotatably mounted on a hub adapted to move with the input shaft and radially displaceable, and further comprising a second wheel concentrically arranged on the output shaft, said second wheel having second wheel rims with second conical transmission surfaces, the axial distance of said second rims being adjustable.
CHARACTERISTIC OF THE KNOWN PRIOR ART
A mechanism of this kind in the form of a friction wheel mechanism has been described in an embodiment of the FR-PS No. 1 332 135. Herein, power is transmitted from the ring onto the wheel arranged on the output shaft by means of double conical disks as intermediate members adjustably spaced from one another, said intermediate members alternately coacting with the conical surfaces of the ring, on the one hand, and with the conical transmission surfaces of the second wheel, on the other hand. The radial adjustment of the hub is effected by means of an eccentric movable in the input shaft designed as a hollow shaft, a clutch being provided between the input shaft and the driving member. Further, the two wheel rims of each concentric wheel are acted upon by pressure springs so that the contact pressure between the transmission surfaces is limited and great torques are not transmissible. Because of the great number of gear members and conical surfaces, the structure of the prior art mechanism is very complicated.
A similar mechanism has also been described in the AT-PS No. 222.966. The reduction ratio therof is continuously and precisely adjustable to the infinite but this mechanism, too, has constructional deficiencies in respect of the transmission of the rotary motion between the radially adjustable and, hence, eccentrically adjustable friction ring and the output shaft, said motion being effected by means of a wobbling bell-shaped coupling member as output member. Only at an infinite reduction ratio runs the wobbling bell-shaped coupling member concentrically with the output shaft, but makes a wobbling motion at any other position, whereby a double cardan joint with the friction ring and the output shaft is obtained. The radial adjustment of the friction ring towards the input shaft is forced by the approach of the two friction rims of the friction wheel integral with the casing, away from the input shaft, however, by means of a spring biased between the input shaft and the hub. In this case, it has also been found that in the transmission of particularly great torques, the spring inserted between the input shaft and the hub is not able to exert the required contact pressure between the friction ring and the friction wheel, particularly when irregular loads occur.
OBJECT OF THE INVENTION
It is the object of the invention to improve and simplify a mechanism of the above-mentioned kind in its working part. Moreover, in a preferred embodiment, a forced displacement of the wheel rims and the hub of the ring in both directions shall be obtained in order to be able to transmit also particularly great torques.
DESCRIPTION OF THE CHARACTER OF THE INVENTION
According to the invention, this is achieved by adapting the ring to also run on the second conical transmission surfaces, the transmission ranges between the ring and the first wheel integral with the casing as well as the second wheel rotatable with the output shaft being offset by 180.degree..
The offset arrangement of the transmittion regions by 180.degree. has already been known from toothed gearings with eccentric double-toothed intermediate member, e.g. from the U.S. patent Ser. No. 546.249.
The eccentrically adjustable ring is now on the one hand, a
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Bednarek Michael D.
Staab Lawrence J.
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