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Piston ring

A piston ring and curved surface technology, applied in the field of pressure rings, can solve the problem of not taking the piston or piston ring abrasion countermeasures or edge load countermeasures, and achieve the effect of avoiding major damage, avoiding abrasion, and excellent wear resistance.

Active Publication Date: 2017-05-10
RIKEN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, the piston rings of JP-A 57-196238, JP-A 2002-39384 and JP-A 2009-91927 use smooth curves to connect the outer peripheral barrel face to the corner, or increase the barrel face compared to the past. Radius of curvature, but measures against galling or edge loads that focus on the trajectory of the piston or piston rings are not taken, so it cannot be said to be sufficient

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Embodiment 1 (first piston ring)

[0044] Composed of materials Containing C: 0.48%, Si: 0.21%, Mn: 0.79%, Cr: 1.02%, V: 0.22% in mass %, bar steel with an outer diameter of 110mm and a length of 200mm, rolled by rings Processing is used to manufacture cylindrical raw materials, and mechanical processing is performed to produce a steel top ring with a rectangular cross-section with a nominal diameter (d1) of 330 mm, a width (h1) of 5 mm, and a thickness (a1) of 9 mm. Next, by gas nitriding at 460°C for 5 hours, a nitride layer of about 70 μm is formed on the entire surface of the ring, and a cermet spray protection film of about 500 μm is formed on the outer periphery. Composite material particles in which fine Cr carbide particles are dispersed in a Ni alloy substrate by flame spraying are the main constituent particles (SM5241 powder from Sulzer Metco Co., Ltd.), and finishing grinding to spraying is finally performed. The film thickness of the protective film was ab...

Embodiment 2

[0052] Embodiment 2 (second piston ring)

[0053] In addition to setting the parameters of the deformed involute curve as a=6000, b=3, α=1, β=1.5, and inverting the first curved surface so that the radius of curvature decreases from the crank chamber side to the combustion chamber side A steel top ring was produced in the same manner as in Example 1 except for formation. In this case, the radius of curvature at a position 0.5 mm from the lower side is 340 mm, the radius of curvature at the top is 270 mm, and the radius of curvature at a position 0.5 mm from the upper side is 100 mm. The retreat amount (t) of the outer peripheral sliding surface on the combustion chamber side was 0.016 mm, which was 0.0048% of the nominal diameter (d1). In addition, the same actual machine test as in Example 1 was carried out, and as a result, there was no failure in any of the cylinders, and there was no abnormality in the sliding surface of the top ring.

Embodiment 3-5

[0054] Embodiment 3-5 (first piston ring)

[0055] Steel top rings of Examples 3 to 5 were manufactured in the same manner as in Example 1 except that parameters a, b, α, and β of the deformation involute curve were set to the values ​​shown in Table 1. Regarding the radius of curvature at the lower side (0.5 mm from the lower side), the apex position, and the upper side (0.5 mm from the upper side), the radius of curvature and the amount of retreat (t) in Examples 3 to 5 are also the same as The results of Examples 1 and 2 are shown in Table 1 together. In addition, when the top rings of Examples 3 to 5 were attached to two cylinders each, a real machine test was carried out in the same manner as in Example 1. As a result, all the cylinders using the top rings had no failure, and the slipping of the top rings There is no abnormality in the face.

[0056] [Table 1]

[0057]

[0058] *The amount of retraction refers to the amount of retraction (t) of the outer peripheral ...

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PUM

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Abstract

The invention discloses a piston ring. In order to provide a piston ring that has excellent scuffing resistance and abrasion resistance, even when used in harsh environments wherein pressure and thermal load are increased, and in order to provide a piston ring that can also avoid edge loading, a first curved surface of an outer peripheral sliding surface according to the present invention protrudes to the outside in a cross-section that passes through the central axis of a piston ring and that is parallel to said central axis, and the radius of curvature of said first curved surface continuously increases or decreases from a crank chamber side to a combustion chamber side.

Description

technical field [0001] The present invention relates to a piston ring, and more particularly to a pressure ring having a barrel-shaped outer peripheral sliding surface. Background technique [0002] In recent years, large diesel engines, including marine engines, have become increasingly higher in output and higher in efficiency (CO 2 decrease) tendency. Specifically, it is planned to increase the effective pressure or maximum pressure of the cylinder, the increase of the stress caused by the increase of thermal load, or the increase of the average piston speed, etc. In particular, it is planned that the maximum pressure in the cylinder will reach 22MPa, and it will be further increased in the future. to 30MPa. The load that presses the first pressure ring (hereinafter also referred to as "top ring") to the cylinder liner surface (hereinafter also referred to as "ring load") increases approximately in proportion to the highest pressure in the cylinder, so the pressure ring...

Claims

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Application Information

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IPC IPC(8): F16J9/20F02F5/00
CPCF02F5/00F16J9/20
Inventor 川西实掛川聪清水大志
Owner RIKEN CO LTD
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