Planetary gear transmission systems or components – Planet periphery surrounds axis of interacting gear – Wabbler transmission
Patent
1997-02-11
1999-06-22
Wright, Dirk
Planetary gear transmission systems or components
Planet periphery surrounds axis of interacting gear
Wabbler transmission
475162, 475177, F16H 132
Patent
active
059137444
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD OF THE INVENTION
This invention relates to an eccentric gear for transmitting a torque or force from an input or driving, rotatable element to a driven element comprising two cooperating gear rings with differing pitch diameters, of which a first, outer gear ring with the largest diameter has a certain number of inwardly directed teeth and a second, inner gear ring has a smaller number of outwardly directed teeth of which only a minor number, e.g. one, is in engagement with the outer gear ring, in that the inner gear ring is mounted in bearings eccentrically relative to the outer one, the gear change between said driving and driven elements being dependent upon the total number of teeth in each gear ring.
PRIOR ART
Eccentric gears of the sort generally related to above are previously known in different embodiments. Thus, in SE 9203101-2 an eccentric gear is disclosed that is specially, although not exclusively, suitable for being used in industrial or other robots. In this case, the gear is delivered as an independent unit, which may be inserted between a driving source, for instance an electric motor, and a driven, rotating element of the robot or the application object in order to gear down a high rotation speed of an output shaft from the driving source to a lower speed of an input shaft that forms the driven element of the application object. An essential advantage of eccentric gears is that they in one single step make possible large gear change relations. Thus, in practice they manage gear changes in the range of 50:1 to 200:1. In comparison with other types of gears, in particular multiple gears, eccentric gears have a constructional simplicity that has been considered to offer an inexpensive solution to the generally occurring problem in mechanical engineering to attain large gear changes. However, such previously known eccentric gears that have been series-produced as independent or separate units for later application with the purchaser/user have had in common that they have always included both an input shaft or shaft part centrically mounted in bearings, and an output shaft or shaft part, likewise centrically mounted in bearings. The inner gear ring has then been provided on a ring- or disk-shaped body of a small axial extension, from which the down-geared rotary motion has been transferred to the output shaft via carrier mechanisms of a more or less complicated and thereby expensive nature. Each of the two shafts of the gear require not only a bearing, but also the installation space thereof; often in opposed ends of a more or less voluminous housing in which the tooth-carrying, eccentrically movable ring or disk body is built-in. Further, costly and space-demanding connections or couplings are required not only between the driving source and the input shaft of the gear but also between the output shaft of the gear and the driven rotary element comprised by the application object of the purchaser/user.
As a further example of an eccentric gear of the sort initially related to, the gear disclosed in U.S. Pat. No. 5,030,184 (Rennerfelt) may also be mentioned.
OBJECTS AND FEATURES OF THE INVENTION
The present invention aims at removing the above-mentioned shortcomings of previously known eccentric gears of the sort related to and providing a constructionally extremely simple gear. Thus, a primary object of the invention is to provide an eccentric gear that not necessarily requires any output shaft and the bearings belonging thereto and which therefore does not require expensive couplings between the gear and the application object for its connection to the application object in question. Further, it is an object of the invention to provide an eccentric gear that may be connected to an arbitrary application object in a simple way. Still another object of the invention is to accomplish an eccentric gear which for its function requires very few components and which therefore can be produced to a very low cost with the ultimate purpose of making the use of the gear possible in
REFERENCES:
patent: 4760759 (1988-08-01), Blake
patent: 4770062 (1988-09-01), Minegishi
patent: 4843911 (1989-07-01), Minegishi et al.
patent: 4994005 (1991-02-01), Rennerfelt
patent: 5030184 (1991-07-01), Rennerfelt
patent: 5232412 (1993-08-01), Zheng et al.
patent: 5704865 (1998-01-01), Rennerfelt
Kwon Peter T.
Siemens Terrance L.
Wright Dirk
LandOfFree
Eccentric gear does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Eccentric gear, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Eccentric gear will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1704171