JPS6223558A - Sound-proof type piston, liner and head for internal-combustion engine - Google Patents

Abstract

PURPOSE:To reduce noise from an internal-combustion engine, by absorbing noise and impacts which are generated accompanied by detonation-like combus tion of the internal-combustion engine, with the use of sound-proof members for a head, a piston and a liner, and by using the sound-proof members indepen dently or in combination. CONSTITUTION:Sound-proof gaskets 3 for a head 1, sound-proof gaskets 11 for a piston and a sound-proof gasket 16 for a liner absorb noise and impact so that noise from an internal-combustion engine may be reduced. As to the sound-proof gaskets 3, 11 for the head and the piston, carbon gaskets made of relatively high heat-conductive and soft materials are used for high tempera ture parts of a head plate 2 and a piston top plate 10. Further, asbestos gaskets made of relatively high heat-insulative materials are used for low temperature parts thereof. Thereby thermalstrains induced in the head plate 2 and the piston top plate 10 are reduced. In the case of that the sound-proof gasket 16 for the liner 14 is made of heat-insulative materials, a copper sleeve 17 and a brass plate 18 are used to promote the uniform distribution of temperature thereover.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The present invention provides a head for reducing the noise of an internal combustion engine by absorbing the noise and shock generated by explosive combustion in the internal combustion engine into a sound insulating material; Regarding pistons and liners.

(B) Prior Art In conventional internal combustion engines, no soundproofing measures are taken using sound absorbing materials for the head, piston, and liner that constitute the combustion chamber.

(c) Problems to be Solved by the Invention The present invention provides a soundproof head, a piston, and a liner that reduce the noise of an internal combustion engine by absorbing the noise and shock generated by explosive combustion in the internal combustion engine into a soundproofing material. The purpose is to obtain.

(d) Means for Solving the Problems An embodiment in which the present invention is applied to a pre-combustion chamber type water-cooled diesel engine will be described below with reference to the drawings.

In FIGS. 1, 2, and 3, the combustion chamber component of the head 1 is attached as a head plate 2 (made of heat-resistant steel) via a soundproof gas get 3 and a cylinder gasket 4, and the head plate 2 has an air inlet. Holes for an exhaust valve 5 and a precombustion chamber 6 and a main combustion chamber 7 are provided. In FIG. 4, the soundproof gasket 3 is composed of an asbestos gasket 8 and a soft carbon gasket 9.

In FIG. 5, the piston top plate 10 is connected to the soundproof gasket 1.
It is screwed to the piston via 1. In FIG. 6, the soundproof gasket 11 is an asbestos gasket 12.
and a soft carbon gasket 13.

In FIG. 7, the liner 14 is shrink-fitted to the cylinder 15 via a soundproof gasket 16. liner 14
A copper sleeve 17 is shrink-fitted to a part of the outer periphery of the cylinder 15, and a true plate 18 is attached to the upper ends of the liner 14 and cylinder 15.

(e) Function The soundproof gasket 3 of the head, the soundproof gasket 11 of the piston, and the soundproof gasket 16 of the liner reduce the noise of the internal combustion engine by respectively soundproofing and absorbing shock.

For the head soundproofing gasket 3 and the piston soundproofing gasket 11, soft carbon gaskets 9 and 13 with relatively good thermal conductivity are used for the high temperature parts of the head plate 2 and piston top plate 10, respectively, and soft carbon gaskets 9 and 13 are used for the low temperature parts. Asbestos gasket 8 has relatively high insulation properties.
and 12 are used to reduce thermal strain generated in the head plate 2 and the piston top plate 10.

When the soundproof gasket 16 of the liner 14 is made of a heat insulating material (for example, an asbestos gasket), the heat of the liner 14 is difficult to transfer to the cylinder 15, so heat is transferred from the high temperature part of the liner 14 to the low temperature part, and the temperature of the liner 14 is made uniform. copper sleeve 17 and true plate 18.
promotes this tendency for liner temperature uniformity.

Although the average temperature of the liner 14 and the lubricating oil temperature tend to rise slightly, the average temperature of the liner 14 can be lowered by lowering the lubricating oil temperature using an oil cooler or the like, if necessary.

(C) Effects of the Invention As explained above, the present invention provides that the soundproofing materials of the head, piston, and liner absorb the noise and shock generated due to the explosive combustion of the internal combustion engine, and that each can be used alone or in combination. It has the effect of reducing internal combustion engine noise.

[Brief explanation of drawings]

Figure 1 is a plan view of the soundproof head, Figure 2 is A-A in Figure 1.
3 is a sectional view taken along line BB in FIG. 1, FIG. 4 is a plan view of the soundproof gasket on the head plate, FIG. 5 is a sectional view of the soundproof piston, and FIG. 6 is a plan view of the soundproof gasket on the top plate of the piston. , FIG. 7 is a cross-sectional view of the soundproof liner. 2...Head plate, 3...Head plate soundproof gasket 8, 12...Asbestos gasket,
9, 13... Soft carbon gasket 10... Piston top plate, 11... Piston soundproofing gasket, 14
... Liner, 15... Cylinder, 16... Liner soundproofing gasket

Claims (1)

[Claims] 1. The combustion chamber component of the head is plate-shaped (head plate).
A head with a structure in which the head plate is attached to the head via soundproofing material. 2 Piston with top plate attached via soundproofing material. 3 Liner attached to the cylinder via soundproofing material.