Drive arrangement for a two-cycle engine

Details Drive arrangement for a two-cycle engine Drive arrangement for a two-cycle engine

1999-11-12

2001-04-10

Wolfe, Willis R. (Department: 3747)

Internal-combustion engines

Transmission mechanism from piston

Crankshaft and connecting rod

C123S055300, C123S054300

Reexamination Certificate

active

06213082

ABSTRACT:

This invention relates to a drive arrangement for a two-cycle engine.
As is known, various types of drive arrangements have been provided for driving reciprocating pistons in internal combustion engines. In some cases, the pistons have been driven off a crank shaft. In other arrangements, such as described in U.S. Pat. No. 5,669,340, a piston/cylinder arrangement employs a gear arrangement for reciprocating piston rods for the engine. In such constructions, the gear teeth of the meshing gears can be worn over time. As a result, the efficiency of the engine and the operability of the invention can diminish over time.
Accordingly, it is an object of the invention to provide a drive arrangement for a piston of a two-cycle engine which is of improved construction.
It is another object of the invention to improve the life of a drive arrangement for the piston of a two-cycle engine.
Briefly, the invention is directed to an engine having a drive shaft for rotation about a longitudinal axis thereof and at least one reciprocally mounted piston disposed radially of the shaft and is particularly directed to a drive arrangement for driving the piston off the rotation of the drive shaft.
The drive arrangement includes a multi-lobe drive cam which is mounted on the rotatable shaft for rotation with the shaft about the axis of the shaft, a piston rod which extends radially of the shaft for rectilinear reciprocation and a roller mounted on the piston road in abutment with the drive cam for reciprocating the piston rod in synchronism with the rotation of the drive cam. Still further, a spring means is provided for biasing the piston rod towards the drive shaft. The piston rod is connected to the piston at an end opposite the rotatable shaft for reciprocation of the piston in a combustion chamber.
In accordance with the invention, a drive force is transferred between the drive cam and the roller mounted on the piston rod in an efficient manner. In this respect, during operation of the engine, the piston comes under compression for only about ¼ of the cycle of the engine. Further, the pressure of compression increases only towards the end of this ¼ cycle. The multi-lobe drive cam is thus shaped so that the maximum forces which are transferred between the drive cam and roller occur only over a small portion of a lobe.
The use of the multi-lobe drive cam eliminates a need for a crankshaft and/or gears between the drive shaft and piston rod and permits reciprocation of the piston rod in a rectilinear manner.
Should wear occur in a roller which abuts against the drive cam, the roller which is removably mounted on the piston rod can be readily replaced from time to time.


REFERENCES:
patent: 4111164 (1978-09-01), Wuerfel
patent: 5287829 (1994-02-01), Rose
patent: 5529029 (1996-06-01), Rowe et al.
patent: 5634441 (1997-06-01), Ragain

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