Expansible chamber devices – Relatively movable working members – Interconnected with common rotatable shaft
Patent
1997-02-13
1998-11-17
Denion, Thomas E.
Expansible chamber devices
Relatively movable working members
Interconnected with common rotatable shaft
92138, 92141, 123 542, 123 543, 123 545, F01B 100
Patent
active
058362347
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a cam piston type engine.
BACKGROUND OF THE INVENTION
Conventional reciprocating piston type engines adopt a crankshaft and connecting-rod mechanism. In order to overcome the improper kinematics of such a mechanism, William Martin Waide of BCDS Corporation (European Patent Application 0,177,214) invented in 1984 a compact, double cam internal combustion engine. In 1991, the Benz Co. of Germany successfully assembled this engine on its sedans. This engine has retained the advantage of good leak tightness found in reciprocating cylindrical pistons, eliminated the crank shaft and connecting rod mechanism and made the engine more compact. However, it used two inner and outer cams, and two sets of roller pair subassemblies to replace the crankshaft and connecting-rod mechanism. Furthermore, because of this structure, the pistons cannot be made into the conventional skirt configuration and thus two sets of guides had to be added to each, piston, resulting in a more complicated structure. In 1989, a reciprocating linked piston type engine was invented which used only one outer cam and the pistons could be made into the conventional skirt configuration, so as to make the engine simpler as a whole. However, owing to the fact that two pistons of each set of linking mechanisms reciprocate simultaneously and no driving force occurs when the engine has not been started, it is necessary to add a device for starting the engine. Moreover, when the two pistons are linked in motion, there will be one stroke in which one piston is in a position to begin exhaust and the other piston is in a position to begin compression, and one piston moves outward away from the center. Since there is no restraining force towards the center at this moment, the roller attached to the piston will separate from the curved surface of the cam to produce impact phenomenon which will become more severe during high speed motion. In order to overcome this drawback, the measure of delaying discharging is uneconomical and unreasonable and only the measure of supercharging can be adopted. However, supercharging is inapplicable when designing engines with lower capacity.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a single cam reciprocating linked piston type engine which is smaller in volume (over one fourth smaller than the conventional crankshaft and connecting-rod type engine having the same capacity), of low weight, high efficiency, large torque, good braking performance, low output rotational speed, and in which a single cam and a linking mechanism with swing-link linking mechanism or linking-rod are used to replace the complicated inner cam and piston mechanism of the conventional "double cam engine", and which is also superior to the conventional "reciprocating linked piston type engine".
The engine of the present invention comprises a swing-link linking mechanism or linking-rod, a cam mounted on a main shaft and a roller pair subassembly mounted at the lower end of a piston skirt.
The swing-link linking mechanism is composed of a swing-link, two pistons, two connecting rods, two roller pins and two swing-link pins. The swing-link swings around a certain point in a plane coincident with the main shaft axis and the bisector of an angle formed by the axes of the two cylinders in which the two pistons move. At two ends of the swing-link there are two swing-link pin holes symmetric about the swing-link pivot. The included angle of the center lines of the two cylinders is equal to the included angle formed by the lines joining the apex and the lowest point of the cam with the cam center, and the axes of the two cylinders intersect at the cam axis. Both ends of the two connecting rods are provided with connecting-rod pin holes respectively having parallel axes and equal distance from the shaft. One connecting-rod pin hole is connected to the roller pin hole by a roller pin, and the other is connected to the swing-link pin hole by a swing-link pin. When the swi
REFERENCES:
patent: 1630273 (1927-05-01), Nordwick
patent: 1765237 (1930-06-01), King
patent: 1765713 (1930-06-01), Boland
patent: 1830046 (1931-11-01), White
patent: 1904680 (1933-04-01), Ferry
China Science and Technology Daily, Feb. 8, 1992 re Benz 169 HP engine.
Chen Feichang
Chen Lei
Xi Zhigeng
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