THE SPECIFICITIES OF KINEMATICS OF ROTOR-PISTON ENGINE FOR A NEW CONSTRUCTION

Abstract

The general structure and principle of operation of the rotary-piston engine of the new design 12RPE-4,4/1,75 with adjustable spool air distribution are given. The design of the engine combines the advantages of piston and rotor engines, provides low values of the specific consumption of the working fluid and high values of efficiency. Considered a rotary-piston engine due to its technical and operational advantages has a wide range of applications in various industries and as part of power plants for various purposes, for example, in the schemes of combined power plants of vehicles. A fairly simple and compact design with a low weight of the proposed engine ensures its low price in manufacturing, as well as reliability and simplicity in operation. The rotor-piston engine due to the uniform placement of the cylinders in the rotor and the low weight of parts that move back and forth gradually, has high balance and the ability to start at any position of the central rotor. The design of the engine, as for all rotary engines, implies the absence of dead volume. That is, a virtually dead volume corresponds to the push operation at the intake pressure in the compressor cycle. In contrast to the existing serial air motors with a spool air distribution, the considered design of a rotary-piston engine has the ability to adjust the valve timing and engine operating conditions due to the degree of filling of the cylinder. Regulation of the valve timing over a fairly wide range is ensured by turning the central adjusting camshaft. In addition, the central adjusting cam allows you to change the direction of rotation of the central rotor. The kinematic scheme is considered, which differs significantly from the classical scheme of a crank mechanism. A kinematic analysis of the rotor-piston engine motion pattern is carried out. For further calculation of the acting forces in the engine, the dependencies of the definition of dimensionless displacement, velocity and acceleration of the piston depending on the angle of rotation of the central rotor φ are proposed. The coefficients of the harmonic series in these dependencies are determined.