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Internal combustion engine piston ring assembly

A technology for piston rings, internal combustion engines, applied in the direction of piston rings, pistons, engine components, etc.

Pending Publication Date: 2017-12-22
HUNAN CITY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To this end, one of the means is to reduce the height of the piston ring, but such a design exposes the piston ring at the head to a higher temperature

Method used

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  • Internal combustion engine piston ring assembly
  • Internal combustion engine piston ring assembly
  • Internal combustion engine piston ring assembly

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Depend on figure 1 , figure 2 It can be seen that a piston ring assembly for an internal combustion engine includes a piston ring mounted on the head of the piston 4, the piston head is provided with at least three ring grooves for installing the piston ring, and the piston ring includes a base body 1 made of a metal material. , the assembly side clearance 6 of the second piston ring adjacent to the combustion chamber is 0.15 mm to 0.65 mm.

[0027] The assembly side clearance 6 of the second piston ring of the present invention is preferably 0.35 mm to 0.65 mm.

[0028] The optimal assembly side clearance 6 of the second piston ring of the present invention is 0.35 mm to 0.45 mm.

[0029] In order to further reduce the stress concentration at the bottom 8 of the ring groove of the piston ring, the bottom 8 of the ring groove in the present invention is in the shape of an arc bottom.

[0030] In order to improve the sealing performance of the piston ring, an expansi...

Embodiment 2

[0051] Depend on Figure 4 It can be seen that in order to improve the strength of the piston ring, the surface of the piston ring substrate 1 of the present invention and the contact portion of the piston is provided with a wear-resistant coating 2, and the wear-resistant coating 2 is a tungsten-cobalt alloy deposited by a physical vapor deposition method and a chromium carbide coating. layer; in terms of weight percentage, the weight ratio of tungsten-cobalt alloy is 60% to 80%, the weight ratio of chromium carbide is 20% to 40%, the sum of each component is 100%, and the cobalt element is 25% of the total component. ﹪~45﹪; the thickness of the wear-resistant coating 2 is 10 μm-50 μm, the porosity of the wear-resistant coating 2 is 3%-12%, and the hardness of the wear-resistant coating 2 is 1850-2350 Vickers.

[0052] In order to improve the bonding force between the substrate 1 and the wear-resistant coating 2 and the bearing capacity of the wear-resistant coating, the pist...

Embodiment 3

[0069] Depend on Figure 5 It can be seen that the oil return hole 12 under the oil tank in this embodiment is a blind hole, and the lubricating oil scraped off by the piston ring can only flow back into the lubricating system through the gap between the piston and the cylinder, so that impurities in the lubricating oil can be reduced, Improve lubricity.

[0070] Remaining with embodiment 1,2.

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Abstract

The invention discloses an internal combustion engine piston ring assembly with the stress concentration at the head part of a piston and the bottom parts of ring slots being reduced. The internal combustion engine piston ring assembly comprises a piston ring arranged at the head part of the piston; the head part of the piston is at least provided with three ring slots for installing piston rings; each piston ring comprises a base body made of metal materials; and an assembly side gap of the second piston ring adjacent to a combustor is 0.15mm to 0.65mm. According to the internal combustion engine piston ring assembly provided by the invention, the assembly side gap of the second piston ring is increased, and the bottom part of each ring slot is changed to a circular arc bottom, so that the stress concentration at the head part of the piston and the bottom parts of the ring slots is reduced; an oil return passage is designed on the piston, so that a leakage phenomenon of lubricating oil is eliminated; no oil return passage is needed to be processed on the piston rings, so that the mass of the piston rings and the piston can be smaller, a stress state of the piston is improved, an engine works reliably in a more balance way, and the service life is longer; and meanwhile, after cobalt is added into wear-resistant coatings of the piston rings, the hardness, the wear resistance and the load bearing capacities of the coatings are greatly improved.

Description

technical field [0001] The invention relates to an internal combustion engine, in particular to a piston ring assembly of an internal combustion engine, in particular to a piston ring assembly of an internal combustion engine with reduced stress concentration on the piston head and the bottom of the ring groove. Background technique [0002] The main function of the internal combustion engine piston is to withstand the combustion pressure in the cylinder, and transmit this force to the crankshaft through the piston pin and connecting rod, so as to complete the predetermined work. The piston head is processed with multiple ring grooves for installing piston rings, which prevent high-temperature and high-pressure gas from entering the crankcase from the combustion chamber, and prevent engine oil from entering the combustion chamber. The number of piston rings depends on the sealing requirements. Generally, 2 to 4 gas rings and 1 oil ring are used. The piston ring far away from...

Claims

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Application Information

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IPC IPC(8): F02F3/00F02F5/00
CPCF02F3/00F16J9/00F16J9/26Y02T10/12
Inventor 廖建勇廖成勇
Owner HUNAN CITY UNIV
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