SU827820A1 - I.c. engine production method - Google Patents

Description

one

The invention relates to the field of mechanical engineering, in particular to the technology of manufacturing and assembling internal combustion engines.

A known method of manufacturing internal combustion engines is that the crankshaft is installed in the crankcase, the distance between the upper plane of the cylinder block or an individual cylinder and the connecting rod neck is measured at its upper position, the connecting rod and piston are sized with dimensions corresponding to the measured distance, and install them in cylinder 1.

However, this method is not used under mass production conditions due to the large laboriousness of selecting a connecting rod and piston with appropriate dimensions, providing the necessary piston clearance, and the impossibility of obtaining identical piston clearances both in the cylinders of one engine and in cylinders of different engines.

The purpose of the invention is to reduce the complexity of selective assembly.

This is achieved in that the cylinder heads are made at least

two size groups along the depth of the groove, mark them and after installing the crankshaft and the connecting rod-piston group measure the distance between

end surface of the cylinder and the bottom of the piston at the position of the latter at the top dead center, after which the head of the corresponding size group is selected and mounted on the cylinder.

In the drawings (e depicts an engine cylinder with a head mounted on it.

The internal combustion engine contains a crankcase, a crankshaft (not shown), a connecting rod-piston group, which includes a rod 1 and a piston 2, a cylinder 3 and a head 4 with a landing groove 5.

The size "and the distance between the end surface 6 of cylinder 3 and the bottom 7 of the bottom 2 at the position of the latter in the dead center is equal to the sum of the sizes" to the depths of the mounting groove 5 and "from the size of the piston gap 8.

The engine is manufactured as follows.

A crankshaft (not shown) and a connecting rod crank assembly consisting of a connecting rod 1 are installed in the crankcase.

and piston 2, after which the distance "a" between the end surface 6 of the cylinder 3 and the bottom of the piston 7 is measured at the position of the latter in the upper dead point. According to the distance obtained as a result of the measurement, “and select the head 4 with a corresponding depth“ in the landing groove 5. Then install the head 4 on the cylinder 3, ensuring the optimum size “from the over piston clearance 8..

The use of the proposed method of manufacturing an internal combustion engine will reduce the deviation from a predetermined size of the piston gap in the cylinders of one engine, ensure the same deviation from the predetermined size of the piston clearance in different engines and reduce the laboriousness of the connecting rod-piston assembly as a result of eliminating the size measurement operation from the center of the lower head connecting rod to the plane of the piston head.

Claims (1)

Invention Formula A method of manufacturing an internal combustion engine with separate heads  cylinders by installing a crankshaft, a connecting rod-piston group and a cylinder head with a mounting groove in the crankcase, the predetermined amount of the piston clearance provided by selective assembly, characterized in that, in order to reduce the complexity of the selective assembly, groups along the depth of the groove, mark them and after installing the crankshaft and the connecting rod and piston group measure the distance between the end surface of the cylinder and the bottom of the piston at the position of the latter in the upper dead center, after which the head of the corresponding size group is selected and installed on the cylinder. Information sources, taken into account during the examination 1. Technical Report of NATI 16053 on a foreign trip to England’s factories "Leyland," Perkins, "Rawls-Royce, Moscow, 1971.