Endless belt power transmission systems or components – Positive drive pulley or guide roll – Having belt-engaging surfaces on discrete circumferentially...
Reexamination Certificate
1997-12-19
2001-10-09
Hannon, Thomas R. (Department: 3682)
Endless belt power transmission systems or components
Positive drive pulley or guide roll
Having belt-engaging surfaces on discrete circumferentially...
C474S161000
Reexamination Certificate
active
06299558
ABSTRACT:
TECHNICAL FIELD
This invention relates generally to drive wheels and more particularly to drive wheels having pivotally mounted bogies to drive a chain.
BACKGROUND ART
Current designs of chain drive systems in a machine use a sprocket to drive the chain. The sprocket is typically a circular member with teeth positioned on its periphery to engage the link retaining pins of the chain. The chain is driven to perform a source of work in a machine such as a conveyor system or a track-type tractor. For example, a track-type tractor has a chain that encircles a portion of and is driven by a sprocket. Some of the problems encountered with a sprocket and chain drive system is noise and vibration and what is known as chordal action. Chordal action is defined as a rise and fall of the chain links, of the engaging portion of the chain, in a radial direction from the center of the sprocket as each of the pins are engaged by and through rotation of the sprocket. Rise is defined as travel of the links in an outwardly radial direction from the center of the sprocket as each one of the pins engages the sprocket and is carried through a portion of rotation of the sprocket. Fall is defined as the travel of the links in an inwardly radial direction toward the center of the sprocket through the remaining portion of rotation of the sprocket. The rise and fall of the chain links induces an oscillating motion in the non-engaged portion of the chain. During the fall motion of the chain, each of the pins to be engaged by the sprocket will impact the sprocket as it is engaged, thereby causing noise, vibration and wear.
The present invention is directed to overcoming one or more of the problems as set forth above.
DISCLOSURE OF THE INVENTION
In one embodiment of the present invention, a drive system has at least two wheels and a chain extending around the wheels having a plurality of links interconnected by transverse pins. At least one of the wheels drives the chain through engagement of the pins and rotation of the at least one wheel. In accordance with this invention, a plurality of bogies each having a first hook adapted to receive one of the pins is pivotally connected to a first one of the wheels. The bogies are positioned such that the hooks receive and carry pre-selected ones of the pins of the chain from an engagement position to a release position during rotation of the first wheel. An impact absorbing cushion member is disposed between each of the bogies and the first wheel, whereby the cushioning member absorbs the impact between the pins and the bogie.
REFERENCES:
patent: 780533 (1905-01-01), Sheley
patent: 1486590 (1924-03-01), Landahl
patent: 1493863 (1924-05-01), Miller
patent: 3205022 (1965-09-01), Eckert-Greifendorff et al.
patent: 3824869 (1974-07-01), Murphy
patent: 3916708 (1975-11-01), Durand
patent: 5026329 (1991-06-01), Diekevers
patent: 5443425 (1995-08-01), Korenberg et al.
Caterpillar Inc.
Hannon Thomas R.
Kercher Kevin M.
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