SU827826A1 - I.c. engine cylinder assembly head - Google Patents

Description

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FIELD OF THE INVENTION The invention relates to the field of engine construction, namely to engine cylinder heads (internal combustion.

A well-known cylinder head of an internal combustion engine, in the exhaust port of which a thermoisolation insert 1 is rigidly fixed.

The disadvantage of this head is that the fixed installation of a heat insulating insert in the exhaust pipe reduces the heat flux through the walls of the pipe when the engine is warming up, which increases the time the engine warms up to operating temperature.

The purpose of the invention is to reduce the warm-up time of the engine to operating temperature by providing access of exhaust gases to the walls of the exhaust pipe.

This is achieved by the fact that the heat-insulating insert is mounted with a possibility of movement relative to the outlet pipe and is equipped with a mechanism for its automatic movement, installed in the outlet pipe. In this case, the mechanism for automatically moving the insert may comprise a bimetallic spiral spring with a movable axis, kinematically connected with a thermally insulating insert.

FIG. 1 shows the cylinder head along the axis of the exhaust pipe, a section; in fig. 2 is a diagram of the automatic movement of the insert.

The cylinder head 1 comprises an outlet 2, the walls of which 3 are separated from the hot exhaust gases by a thermal insulating insert 4. To the cylinder head 1 is attached an exhaust manifold 5,

in which the heat-insulating insert 4 is partially located. Between the heat-insulating insert 4 and the walls of the pipe 3 there is an air hollow 6. The heat-insulating insert 4 contains a stop 7 which includes a lever 8 fixed on the moving axis 9. A bimetallic spiral is attached to the opposite end of the supporting shaft 9. a spring 10 and a lever 11 to which the return spring 12 is attached.

When the engine is cold, the spring 10 rotates the axis 9, and the lever 8 pushes the thermal insulator 4 to the side of the exhaust pipe 2, as a result of which the exhaust gases are allowed to access the walls of the exhaust pipe 3. As the engine warms up, the bimetallic coil spring 10 must be lowered and unwinding allows

return spring 12 rotate the movable axis 9, move the thermal insulating insert 4 to its original position and thus prevent the exhaust gases from accessing the walls of the exhaust pipe 3.

The proposed design makes it possible to shorten the engine warm-up time to the operating temperature and the engine operating time in the non-operating temperature range, which reduces the mechanical wear and engine life.

Claims (2)

1. The cylinder head of an internal combustion engine, containing an exhaust pipe with a thermal insulating insert installed therein, is characterized in that, in order to shorten the engine warm-up time to operating temperature by providing exhaust gas access to the walls of the exhaust pipe when the engine is warming up, the thermal insulating insert is installed movable relative to the outlet and equipped with a mechanism for its automatic movement, installed in the exhaust pipe. 2. A head according to claim 1, characterized in that the mechanism for automatically moving the thermally insulating insert comprises a bimetallic helical spring with a movable axis, kinematically connected with the thermally insulating insert. Sources of information taken into account in the examination 1. Application of the Federal Republic of Germany N ° 2537676, cl. F 02F 1/42, published. 1976. st /