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Upper part with assembled piston

A part and piston technology, applied in the field of the upper part of the assembled piston, can solve the problems of high cost and so on

Active Publication Date: 2011-12-28
MAHLE INT GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The downside is that both the materials for the layers and the cost of this detonation spraying process are very expensive

Method used

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  • Upper part with assembled piston
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  • Upper part with assembled piston

Examples

Experimental program
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Embodiment Construction

[0008] figure 1 The upper part 1 of the piston is shown, the lower part of which is not shown in the schematic diagram, in figure 1 A bottom side view of half of the upper part 1 is briefly shown in , which shows the inner radial contact surface 2 and the outer radial contact surface 3 , wherein the upper part bears against the piston 1 via the contact surfaces 2 and 3 on the lower part. The upper part 1 is produced from steel. The lower part can be made of steel, aluminum or cast iron with nodular graphite.

[0009] The upper part 1 has a piston crown pocket 5 formed in its piston crown 4 . The radially outer region of the upper part 1 on the piston top side is designed as a refractory blunt 6 to which a piston ring 7 with three annular grooves 8 , 9 , 10 is connected in the direction away from the piston top.

[0010] The underside of the upper part 1 facing away from the piston crown has a screw 12 coaxial to the piston axis 11 , by means of which the upper part 1 is sc...

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Abstract

The invention relates to an upper part (1) of an assembled piston, which has a radial inner contact surface (2) arranged on the underside of an annular rib (15) and a lower A laterally arranged, radially outer contact surface (3), wherein the outer contact surface (3) and the inner contact surface (2) each have a rib-shaped profile in the form of a concentric rib with an average roughness between Rz10 and Rz30 Spend. This reduces the wear on the contacting surfaces of the upper part and the lower part of the assembled piston.

Description

technical field [0001] The invention relates to an upper part of an assembled piston according to the preamble of claim 1 . Background technique [0002] In the patent application document DE 36 33 134 C2, an assembled piston consisting of an upper part and a lower part is disclosed, in which piston, in order to reduce the wear of the surfaces of the upper part and the lower part which come into contact with each other, between the two A high wear-resistant layer is arranged between the faces. The layer is applied on one of the two contact surfaces according to the detonation spraying process to ensure good adhesion of the layer to the contact surfaces. This layer can be formed from a tungsten carbide-cobalt alloy or from a copper-nickel-indium alloy. A disadvantage of this is that both the material of the formed layer and the cost of this detonation spraying process are very expensive. Contents of the invention [0003] The object of the invention is to avoid this disa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02F3/00
CPCF02F3/0023F16J1/09F02F3/00
Inventor 迪特尔·梅斯默克里斯托夫·盖斯勒罗兰德·施密特
Owner MAHLE INT GMBH