JPH0728263U - Internal combustion engine compression piston ring - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a means for preventing overheating of a ring in a compression piston ring of an internal combustion engine by increasing the thermal conductivity of the ring and sufficiently radiating heat from the compression ring to the cylinder. The purpose is to [Structure] In a compression ring 2 of a piston 1 of an internal combustion engine, a metal sodium 22 is annularly sealed inside the compression ring 2.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a compression ring for a piston of an internal combustion engine, and more particularly to a structure for increasing the thermal conductivity of the piston compression ring and promoting its cooling.

[0002]

[Prior art]

 Conventionally, various measures have been taken to cool each device in an internal combustion engine. For example, regarding cooling of an exhaust valve, it is known that the inside is hollow and sodium is enclosed. In a diesel engine with a high heat load, how to lower the piston temperature and how to deal with thermal stress and wear is a structural point. It has been devised, and methods such as spraying lubricating oil from the back surface of the crown part have been implemented.

[0003]

[Problems to be solved by the device]

 In order to lower the piston temperature, it is necessary to sufficiently radiate heat from the piston to the cylinder via the piston ring. However, in the past, this was not sufficient, and in particular, the compression ring, which is directly exposed to combustion gas and located close to the piston head where it is easy to overheat, causes seizure due to high temperature and causes ring sticking to cause piston ring. May not rotate in the ring groove, and the entire piston may burn into the cylinder, rendering the engine inoperable. In order to solve the above problems, it is an object of the present invention to provide a means capable of increasing the thermal conductivity of the compression ring and sufficiently radiating heat from the compression ring to the cylinder.

[0004]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides a piston compression ring characterized in that a compression ring of a piston of an internal combustion engine has a metal sodium sealed inside the compression ring.

[0005]

[Action]

 According to the device of the present invention, the compression ring of the internal combustion engine is filled with a metal sodium, which is a material having a higher thermal conductivity than the material of the compression ring, inside the compression ring. The heat is sufficiently dissipated and the compression ring is prevented from overheating.

[0006]

【Example】

 Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 2 shows an example of an exploded perspective view of a piston and a piston ring of a conventional internal combustion engine. In the figure, 1 is a piston, 2 is a compression ring, 3 is an oil ring, 11 is a piston head, 20 is a compression ring groove, and 30 is an oil ring groove.

FIG. 1 shows an embodiment of the present invention. In the figure, the same parts as those in FIG. 2 are designated by the same reference numerals and the description thereof will be omitted. The figure shows a partial sectional view of the piston 1 incorporated in the cylinder 4 in the vicinity of the piston head 11. As a feature of the present invention, a metal ring 22 is annularly sealed inside a compression ring 2 made of cast iron 21.

When the engine is operated in the above state, the thermal conductivity of the metallic sodium 22 is higher than that of the cast iron 21 as shown in Table 1, so that the thermal conductivity of the entire compression ring 2 is increased, and the engine is running. The amount of heat transmitted from the high temperature part of the cylinder head 11 to the cylinder 4 through the compression ring 2 is much larger than that in the case of the compression ring of the cast iron 21 alone, and the heat radiation effect is large, so that the compression ring 2 Overheating is prevented.

[0009]

[Table 1]

Due to the above, the compression ring is seized due to the high temperature, which causes the ring stick to prevent the piston ring from rotating in the ring groove. Further, the entire piston is seized in the cylinder, and the engine becomes inoperable. Nothing happens. This is particularly effective in a diesel engine with a high heat load.

[0011]

[Effect of device]

 The following effects can be obtained by implementing the present invention. (1) The piston radiates heat more sufficiently to the cylinder than the conventional cast iron compression ring, prevents overheating of the compression ring, and prevents seizing, ring sticking, etc. of the compression ring. (2) The device is simple, does not take up space, and is highly reliable.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of an embodiment of the present invention.

FIG. 2 is an example of an exploded perspective view of a piston and a piston ring of an internal combustion engine according to a conventional technique.

[Explanation of symbols]

 1 ... Piston 2 ... Compression ring 3 ... Oil ring 4 ... Cylinder 11 ... Piston head 20 ... Compression ring groove 21 ... Cast iron 22 ... Metal sodium 30 ... Oil ring groove

Claims (1)

[Scope of utility model registration request] 1. A compression piston ring of an internal combustion engine, characterized in that in a compression ring (2) of a piston (1) of the internal combustion engine, metallic sodium (22) is enclosed inside the compression ring (2).