Abstract
The paper presents a qualitative analysis of a crank-and-rocker piston mechanism. In comparison to a conventional piston assembly the mechanism is composed of more elements necessary to convert the reciprocating motion of the pistons to rotary motion of the crankshaft. A greater complexity of the system is balanced by a greater number of advantages particularly visible in the module, composed of four cylinders coupled by the rocker with a single crank journal. A greater number of elements allow an obtainment of better functional flexibility of the mechanism, particularly in terms of the piston movement. This feature can be used to control the course of the engine torque, the heat losses to the cooling system, the reduction of the piston pressure on the cylinder liners (friction and mechanical losses) as well as variation of the compression ratio easily performed during engine operation. The natural characteristics of the four-cylinder module have been highlighted through an internal balancing of the mass forces. The analysis does not contain the elements of design. The design parameters in the analysis are random. They were selected to highlight the properties of the design and show negative and positive features. The relations and remarks included in the paper may turn out useful when designing the mechanism.
Highlights
The paper presents a qualitative analysis of a crank-and-rocker piston mechanism
In comparison to a conventional piston assembly the mechanism is composed of more elements necessary to convert the reciprocating motion of the pistons to rotary motion of the crankshaft
A greater number of elements allow an obtainment of better functional flexibility of the mechanism, in terms of the piston movement
Summary
The theory of operation of the crank and rocker piston assembly is based on forcing the rotary movement of the crank through reciprocating motion of the pistons in piston machines (internal combustion engines and piston compressors). The discussed design is a subject of a patent claim [1]. The essence of the idea is the separation of the direct connection of the crankshaft journal with the piston (as is in regular mechanisms). The base of the connecting rod (4) (Fig. 1) of the rocker mechanism is coupled with the crankshaft journal (3), fitted to the arm (2) of the crankshaft (1), as in a conventional mechanism. The upper end of the connecting rod fitted on a pivot (5) is not connected with the piston wristpin but with the arm of the rocker (10) of length R
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