RU2696518C1 - Device for bimetallic bottom of cylinder head of internal combustion engine - Google Patents

Abstract

FIELD: engines and pumps.

SUBSTANCE: invention can be used in production of piston internal combustion engines, in particular, in design of covers of cylinders of forced internal combustion engines (ICE). Device of bimetallic bottom of cylinder head (1) of ICE comprises bimetallic head (1) and metal insert (2). In the upper part of insert (2) along the whole surface there are longitudinal and transverse stiffeners (3). Insert (2) is made of steel and passes through holes of attachment of head (1) to cylinder block.

EFFECT: reduced temperature deformation and higher strength and reliability of the structure.

1 cl, 2 dwg

Description

The invention relates to the field of mechanical engineering, namely to piston internal combustion engines, in particular to the cylinder head structures of forced internal combustion engines (ICE).

A bimetallic cylinder head of a diesel engine is known, comprising an aluminum body and a cast-iron insert located at the bottom of the cylinder head, in which a recess is made in the form of a truncated cone or part of a sphere from the plane of contact with the material of the cylinder head in the area of the hole for the nozzle nozzle exit (see AC USSR No. 1666795, 1989). However, due to the high deformation during thermal expansion of the head, destruction can occur.

The closest in technical essence is the device of the bimetallic bottom of the cylinder head of the internal combustion engine, containing an aluminum body and a cast-iron insert, with semicircular recesses (see patent RU No. 2 456 465,2011).

However, a cast-iron insert located in the bottom of the head and closing one cylinder is subjected to high strain stresses due to thermal expansion of the head and the load from expanding gases, which can lead to destruction of the cylinder head design.

The technical task is to create an improved bottom of the bimetallic head of an internal combustion engine with increased strength.

The technical result is an increase in strength, rigidity, reliability of the device by improving the design.

It is achieved by the fact that in the known device containing a bimetallic head and a metal insert, longitudinal and transverse stiffeners are made over the entire surface in the upper part of the insert, the insert is made of steel and passes through the holes of the head to the cylinder block.

The insert is made of steel and, depending on the design features of the internal combustion engine, closes more than one cylinder. As a result of heating and due to different temperature deformations of the insert and the aluminum base of the ICE head, the longitudinal and transverse ribs can reduce the deformation of the aluminum base of the ICE head and increase the strength and rigidity of the structure.

The proposed device is shown in the drawing (Fig. 1 is a sectional view, Fig. 2 is a perspective view). The device comprises a bimetallic cylinder head 1 with a steel insert 2 and longitudinal and transverse stiffeners 3 in the upper part over the entire surface of the insert.

The device operates as follows. The cylinder head heats up unevenly. Due to the different coefficients of thermal expansion of aluminum and steel, high stresses arise in the contact area of various materials. Stiffening ribs 3, located in the upper part of the insert 2, hold aluminum in the expansion process, thereby reducing stress in the contact area of various materials. The insert itself with stiffeners (Fig. 2) is made by stamping or milling on a CNC machine. After that, the insert is degreased and subjected to an aliasing process for 40-60 minutes for diffusion penetration of aluminum into the material of the insert. Then the insert is placed in the mold for the manufacture of the cylinder head, in which the valve stems are the base (not shown) onto which the insert is installed through the valve openings 4, made in the insert and filled with aluminum alloy.

The proposed device is the fire bottom of the cylinder head with an insert of steel that closes more than one cylinder, which improves the strength and reliability of the design of the bimetallic cylinder head.

Information sources

1. AS of the USSR No. 1666795, 1989

2. patent RU 2 456 465,2011, (prototype).

Claims (1)

The device of the bimetallic bottom of the cylinder head of an internal combustion engine, containing a bimetallic head and a metal insert, characterized in that longitudinal and transverse stiffeners are made over the entire surface of the insert along the entire surface, the insert is made of steel and passes through the holes for fastening the head to the cylinder block.

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