Expansible chamber devices – Piston – With separable means for pivotally mounting connecting rod...
Patent
1991-11-29
1994-05-03
Denion, Thomas E.
Expansible chamber devices
Piston
With separable means for pivotally mounting connecting rod...
92216, 92219, 92238, 92239, 1231936, F16J 114
Patent
active
053077326
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates generally to a piston assembly for use in an internal combustion engine, compressor or the like and more particularly to the retention of a piston member to a piston pin.
BACKGROUND ART
The last several years has seen an increasing emphasis being placed on the design of engines to make them more compact, lighter and yet with improved fuel economy, efficiency, reduced emissions, greater service life and increased power output per cylinder. As present day engines are converted or upgraded, the piston assembly is subject to even higher combustion chamber pressures and temperatures.
Attempts have been made to overcome the effects of higher combustion chamber pressures by altering the design of the piston member to include perforated gussets and increased cooling ribs. An example is disclosed in U.S. Pat. No. 4,502,422 issued to David E. Brann on Mar. 5, 1985. A piston and a carrier member are removably attached together and retained by a snap ring. A trunnion pin is positioned within a pair of struts members in the carrier member and is bolted to the connecting rod. Thus, the struts surround the pin and are in rotational relationship thereto.
Another example of a piston assembly is disclosed in U.S. Pat. 4,644,853 issued to Robert A. Russell et. al. on Feb. 24, 1987 wherein a piston assembly has a head member and a skirt member being connected with a pin which is bolted to a connecting rod. The piston head member includes a piston pin connecting section having a pair of arms encircling the pin and structurally connecting the pin to the piston head member in a generally conventional manner.
In another example, U.S. Pat. No. 4,013,057, issued to William D. Guenther on Mar. 22, 1977, discloses a piston assembly. The piston assembly includes separate head and skirt portions. The head portion includes a generally tubular-shaped bearing member having a wrist pin positioned therein and the wrist pin being bolted to the connecting rod. The bearing member, although having an opening therein, extends cylindrically around the pin a sufficient distance to insure that the head portion and the pin remain connected during operation of the piston assembly.
Each of the above described patents discloses a high performance piston assembly. In the structures described, the components are heavy, include excessive structural material and increase the complexity of the engine design by contributing to increased inertia, stresses and weight. For example, each of the pistons include a pair of struts or connecting members which surround or at least partially surround the wrist pin.
The present invention is directed to overcome one or more of the problems as set forth above.
DISCLOSURE OF THE INVENTION
In one aspect of the invention, a piston assembly is comprised of a piston member including a crown having a top surface, a bottom surface, a tubular member depending away from the top surface and having an outer surface defining a plurality of grooves therein. The piston member further includes a pair of leg members being positioned radially inwardly of the tubular member, extending from the bottom surface and being spaced one from the other a preestablished distance. Each of the leg members has a mounting surface thereon positioned at an end of the leg member opposite the bottom surface of the crown and has a threaded bore in the mounting surface. The piston assembly further includes a wrist pin having an outer surface with at least a portion thereof in contacting relationship to the mounting surfaces of the piston member. The wrist pin has a pair of bores therethrough. The piston assembly further includes means for fastening the wrist pin to the piston member being positioned in the bores.
In another aspect of the invention, a piston assembly is adapted for use with an internal combustion engine including a block having a bore therein, a crankshaft rotatably mounted in the block, and a connecting rod rotatably connected to the crankshaft. The piston assembly is connected to the connecting r
REFERENCES:
patent: 1228048 (1917-05-01), Rich
patent: 1548329 (1925-08-01), Nelson
patent: 1681494 (1928-08-01), Noble
patent: 2059713 (1936-11-01), Schneider
patent: 4644853 (1987-02-01), Russell et al.
patent: 5072654 (1991-12-01), MacGregor
Cain Larry G.
Caterpillar Inc.
Denion Thomas E.
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