RU198607U1 - Forged internal combustion engine piston - Google Patents

Abstract

The utility model is a stamped piston of an internal combustion engine (ICE) with a nirisist insert and a thermal barrier ceramic coating. N-resist insert 1 is made by isothermal stamping. To do this, a workpiece is stamped, processed in a place to fit the size for a ni-resist insert 1 with a reverse cone, then it is heated in an oven, stamped, as a result, stamping with two transitions is obtained, the first - with a thickened bottom on the stamped workpiece, and the second transition where the insert is stamped and occurs formation of the combustion chamber (i.e. the piston crown). On the surface of the bottom and skirt of a stamped piston of an internal combustion engine with a ni-resist insert 1, by the method of micro-arc (plasma electrolytic) oxidation, a two-layer catalytically active thermobarrier ceramic coating 2, 15-150 μm thick, is formed. The first (inner) coating layer, 5-100 microns thick, consists mainly of aluminum (at least 90 mol.%) And contacts directly with the metal from which the piston and the head of the sphere of the internal combustion engine chamber are made. The first layer has high hardness and wear resistance. The second (outer) porous layer, 10-100 microns thick, consists of aluminum oxide, silicon oxide and cerium oxide in a molar fraction of 1 to 50%. The second layer has high adhesive strength, resistance to thermal shock and thermal cycling, and also has a thermal barrier and catalytic effect. 3 ill.

Description

The utility model relates to engine building, and in particular to stamped pistons of an internal combustion engine (ICE).

Known is a stamped internal combustion engine piston with an installed ni-resist ring holder (SU 1473898, IPC B21K 1/18).

The disadvantage of the analogue is the lack of resistance to thermal cycling and thermal dynamic protection.

Known internal combustion engine piston with catalytically active thermal barrier ceramic coating. On the surface of the bottom and skirt of the internal combustion engine piston, by the method of micro-arc (plasma electrolytic) oxidation, a two-layer catalytically active thermal barrier ceramic coating, μm thick, is formed. (RU 155143, IPC F02F 3/12; F02B 77/02; F02B 77/11, publ. 09/20/2015)

The disadvantage of the analogue is that with increasing pressure, when the engine is forcing, the grooves of the compression rings are destroyed.

The challenge facing the author is to create a stamped piston with thermal dynamic protection, resistant to thermal cycling and a durable insert with grooves for compression rings.

The task is solved due to the formation of a ceramic thermal barrier coating on the stamped piston, based on aluminum oxide and cerium oxide, by the method of microarc oxidation, and thanks to a ni-resist insert installed by isothermal stamping in place of the grooves for the piston compression rings.

The essence of the utility model is the creation of a reliable, wear-resistant stamped piston with thermal dynamic protection, resistant to thermal cycling and a strong insert with grooves for compression rings, due to the formation of a ceramic thermal barrier coating on the stamped piston of the internal combustion engine, based on aluminum oxide and cerium oxide, using the microarc (plasma electrolytic ) oxidation, and thanks to a ni-resist insert installed by isothermal stamping in place of the grooves for the piston compression rings.

In FIG. 1 shows a stamped internal combustion engine piston (in section) with a thermal barrier ceramic coating and a non-resist isothermal insert, with a groove for one (upper) compression ring.

In FIG. 2 shows a stamped internal combustion engine piston (in section) with a thermal barrier ceramic coating and a non-resist isothermal insert, with a groove for two (upper and lower) compression rings.

In FIG. 3 shows the external view of a stamped internal combustion engine piston with a thermal barrier ceramic coating and a non-resist isothermal insert, with a groove for two (upper and lower) compression rings.

Forged pistons with a non-resist insert under the upper or upper and lower compression rings can be used in engines, depending on the degree of their load. So, for example, in gasoline engines of passenger cars, a stamped internal combustion engine piston with a non-resist insert is used, only under the upper compression ring, and in diesel engines of trucks, a stamped internal combustion engine piston with a non-resist insert under the upper and lower compression ring is used.

Implementation of the utility model:

N-resist insert 1, made by isothermal stamping. To do this, a workpiece is stamped, processed in a place to match the size for a ni-resist insert 1 with a reverse cone, then heated in an oven, stamped, as a result, stamping with two transitions is obtained, the first with a thickened bottom onto the stamped workpiece, and the second transition where the insert is stamped and the formation takes place combustion chambers (i.e. piston crown). This method of stamping ensures the production of precise blanks from light alloys, in particular, aluminum alloys, and also provides the production of blanks with a complex profile, including those with thin walls, ribs, elements of asymmetry, etc. This is possible due to the creation of conditions in the stamping tool close to isothermal. In this case, the plasticity of the deformable material increases significantly; resistance of the material to deformation - decreases. The resulting blanks are characterized by enhanced mechanical properties, good microstructure development and minimal allowances for subsequent cutting.

On the surface of the bottom and skirt of the stamped piston of an internal combustion engine with a ni-resist insert 1, by the method of micro-arc (plasma electrolytic) oxidation, a two-layer thermal barrier ceramic coating 2, 15-150 μm thick, is formed. The first (inner) layer of the coating, 5-100 microns thick, consists mainly of aluminum (not less than 90 mol.%) And is in direct contact with the metal from which the piston and the head of the sphere of the internal combustion engine chamber are made. The first layer has high hardness and wear resistance. The second (outer) porous layer, 10-100 microns thick, consists of aluminum oxide, silicon oxide and cerium oxide in a molar fraction of 1 to 50%. The second layer has high adhesive strength, resistance to thermal shock and thermal cycling, and also has a thermal barrier and catalytic effect. Additionally, the coating can contain oxides of copper and magnesium, and be catalytically active.

The technical effect of using a stamped internal combustion engine piston with a non-resist insert and a thermal barrier ceramic coating is:

- temperature rise in the combustion chamber;

- increasing the completeness of fuel combustion;

- reducing the level of emissions of carbon monoxide (CO), carbon dioxide (CO2) and hydrocarbons into the environment;

- reducing the heat load on the cooling system and other engine parts;

- increasing the efficiency of the internal combustion engine;

- increasing the reliability, wear-resistant and efficiency of the forged internal combustion engine pistons;

- reduction of the overall weight and inertia of the engine, compared to engines with steel and composite pistons.

Thus, the task assigned to the author has been completed.

Claims (1)

A stamped piston of an internal combustion engine (ICE), characterized by the presence of a ni-resist insert installed by the isothermal stamping method under at least one compression ring, while a two-layer thermal barrier ceramic coating is formed on the surface of the piston bottom and skirt.

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