SU941658A1 - Piston - Google Patents

Description

(54) PISTON

one

The invention relates to mechanical engineering, in particular to engine-building, to the design of pistons of internal combustion engines.

The piston of an internal combustion engine is well-known, it contains a thermosache, it is lining placed on the bottom and side surface of the piston 1.

The disadvantage of such a piston is the unreliable (non-rigid) mounting of the heat insulating disk to the bottom, which in the process of operation of an adiabatic engine under the action of inertial forces and thermal stresses leads to the destruction of the piston. The possibility of cracks in the disk and the sleeve is aggravated by their solidity. In addition, a ceramic piston jacket in case of contact with the liner will contribute to intensive wear of the cylinder mirror.

The aim of the invention is to improve the reliability of the piston.

The goal is achieved by the fact that the thermal overlay of the bottom is made in the form of a central insert and adjacent segments, and the side surface coverings are in the form of separate plates, the segments being additionally provided with internal and external surfaces with radial and tangential grooves, and the plates with longitudinal and transverse grooves . In addition, the segments and plates are fastened to the ground using a dovetail connection.

FIG. 1 shows the proposed piston with thermal overlays on the bottom and side surface, a longitudinal section; in fig. 2 - the same, top view; in fig. 3 - plate, general view.

Claims (2)

Porschen 1 contains a conical center-insert 2 and adjacent segments 3 of ceramic material or heat-resistant steel with radial 4 and tangential 5 thermo-unloading grooves (Fig. 2) located with the outer surface of the segments and thermo-distribution grooves 6 located on the inner surfaces segments. On the side surface of the piston above the upper piston ring are fixed plates 7 with longitudinal 8 and transverse 9 thermal-unloading grooves (Fig. 3) and thermo-distribution grooves 10 (Fig. 1). Segments 3 and plates 7 are fixed on the piston by means of a dovetail connection with a gap between adjacent segments and plates equal to the width of the thermo-unloading grooves. When an adiabatic engine with the proposed design of a piston is lower, e and the side surface of which is above the upper compression ring covered with thermosetting in the form of segments and plates, the thermal resistance of the head increases, the heat removal and cooling medium decrease, which in turn leads to an increase in surface temperature conditions of the working process and increase the efficiency of the engine, and when used in an adiabatic engine heat exchanger leads, respectively, to itelnomu improve efficiency in connection with a high temperature exhaust gases. At the same time, the presence of thermo-unloading and thermo-distributing grooves on the ceramic elements eliminates the causes of the appearance of cracks and increases the reliability of the piston or the engine as a whole. / / Fug. Claim 1. Piston for an internal combustion engine, comprising thermal overlays placed on the bottom and side surfaces, characterized in that, in order to improve reliability, the thermal underlay of the bottom is made in the form of a central insert and adjacent segments, and on the side surface overlays in the form of separate plates, the segments being additionally provided with radial and tangential grooves along the inner and outer surfaces, and the plates with longitudinal and transverse grooves. 2. A piston according to claim 1, characterized in that the segments and plates are attached to the piston by means of a dovetail connection. Sources of information taken into account in the examination 1. Patent of England No. 1338712, cl. F 02 F3 / 12, published. 1973.