Machine element or mechanism – Gearing – Interchangeably locked
Patent
1982-07-12
1984-11-13
Herrmann, Allan D.
Machine element or mechanism
Gearing
Interchangeably locked
74344, F16H 322
Patent
active
044818378
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
This invention relates to a transmission providing multiple forward and reverse speeds, and more particularly to a simple and yet rugged transmission of the layshaft and sliding gear type.
2. Background Art
Conventional gear transmissions are known which include an input shaft, an output shaft coaxial therewith, and a unidirectional layshaft having a plurality of speed change gears thereon parallel thereto. A reverse idler gear mechanism is usually employed therewith on a third axis to couple one of the layshaft gears to the output shaft and to reverse the direction of the output shaft. Unfortunately most of these prior transmissions provided only a single reverse speed for vehicular use.
Another disadvantage of some of these known layshaft gear transmissions is that they use shiftable elements for changing the gear ratios on both of the primary axes. Hence, the control mechanism for axially moving the shiftable elements has been unduly complicated.
Moreover, many more of these layshaft gear transmissions have used constant mesh gearing and dog clutches of the usual type to effect a gear speed change. These clutches are subject to failure because the associated elements are often engaged with the parts moving at nonsynchronous speeds and as a consequence they are continually being made more sophisticated and complex at additional cost in order to extend the service life of the transmission.
The sliding gear transmissions of U.S. Pat. Nos. 2,966,067 and 3,025,711 issued to R. Sommer on Dec. 27, 1960 and Mar. 20, 1962, respectively, have solved some of these problems. However, these referenced transmissions do not provide an engine driven power take-off (PTO) function, an output power path function along the layshaft axis, or a simple and effective bearing system to support the rotatable elements necessary to provide these two functions. Moreover, there is no provision for reducing the speed of the input shaft to facilitate shifting of the sliding gears.
The present invention is directed to one or more of the problems set forth above.
DISCLOSURE OF THE INVENTION
In one aspect of the invention a multiple speed gear transmission of the sliding gear type includes an input shaft on a first axis, a layshaft on a second axis having a plurality of drive gears connected for joint rotation therewith, first sliding gear means for selectively driving the layshaft in either direction of rotation, a tubular output shaft on the first axis, second sliding gear means for selectively connecting one of the drive gears drivingly to the tubular output shaft, and wherein the input shaft has a distal end portion serving as a power take-off (PTO).
The instant multiple speed forward and multiple speed reverse transmission is particularly used for a vehicle such as a track-type tractor. It can provide five forward and four reverse speeds, for example, or without a direct drive mode of operation can provide an equal number of forward and reverse speeds. A, a clutch is used for disengaging the input shaft from the power source and a brake is applied to the input shaft so that the shifting elements can be conveniently moved axially solely along the first axis and the change in gear ratio effected with minimum clashing.
Advantageously, the distal end of the input shaft serves as a power take-off (PTO), and it is encircled and supported by the output shaft which is substantially tubular. A pinion gear on the output shaft drives an output gear located on the axis of the layshaft, which output gear supports one end of the layshaft within it for compactness.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a diagrammatic, vertically sectionalized, longitudinal elevational view of a multiple speed gear transmission constructed in accordance with the present invention; and
FIG. 2 is a diagrammatic, fragmentary sectionalized elevational view of a reverse idler gear operatively associated with the multiple speed gear transmission of FIG. 1 on a laterally offset axis.
BEST MODE FOR CARRYING OUT THE INVENTION
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REFERENCES:
patent: 795933 (1905-08-01), Power
patent: 841109 (1907-01-01), Bramley-Moore
patent: 1574082 (1926-02-01), Haggart, Jr.
patent: 2021404 (1930-01-01), Church
patent: 2110180 (1935-12-01), Semery
patent: 2246636 (1940-02-01), Peterson et al.
patent: 2953943 (1960-09-01), Arnold
patent: 2966067 (1960-12-01), Sommer
patent: 3025711 (1962-03-01), Sommer
patent: 3157257 (1964-11-01), Root
patent: 3364793 (1968-01-01), Eastwood
patent: 4000662 (1977-01-01), Wolfe
patent: 4033197 (1977-07-01), Shikiya et al.
Caterpillar Tractor Co.
Herrmann Allan D.
Lanchantin, Jr. Charles E.
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