JPH0733013Y2 - Internal combustion engine piston ring - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a piston ring of an internal combustion engine.

[Conventional technology]

The piston ring is an important component that has a gas sealing function in the cylinder of an internal combustion engine. However, the conventional piston ring often suffers breakage or abnormal wear.

FIG. 7 is a sectional view of a conventional diesel engine, where 01 is a piston, 02 is a cylinder liner, 03 is a cylinder cover,
04 is a combustion chamber, 05 is an exhaust valve, 06 is a fuel valve, and 07 is a piston ring. Of these, 07a is the top ring, 07b is the 2nd ring, 07c is the 3rd ring, and 07d is the end ring.

When fuel is injected from the fuel valve 06 into the combustion chamber 04 near the top dead center, the fuel combusts, the gas pressure pushes the piston 01 downward, rotates the crankshaft (not shown), and mainly the inertia of the flywheel. The force raises the piston again. Due to such repetitive motion, the diesel engine operates and the piston 01
The piston ring 07 attached to the side surface of the cylinder slides with the cylinder liner 02 via lubricating oil.

(Problems to be solved by the invention) However, the piston ring of the conventional internal combustion engine only moves vertically in the piston ring groove under normal operating conditions, and its circumferential movement is slow, and sometimes it causes unspecified movement. In such a case, in the conventional piston ring, the high-temperature high-pressure gas in the cylinder flows over the 2nd ring through the clearance gap of the top ring, but when this gas stagnates without moving in the circumferential direction, this gas Is locally heated to a high temperature.

In this case, the cylinder oil near the ring heated to a high temperature deteriorates at a high temperature and loses lubricity, and the high temperature strength of this locally heated ring decreases significantly, causing thermal strain and cutting damage. There is.

The object of the present invention is to eliminate the drawbacks of the conventional device described above, to prevent the occurrence of a high temperature part locally in the ring, to provide a uniform temperature distribution in the piston ring, and to prevent a cut or abnormal wear in the piston ring of an internal combustion engine. To provide.

(Means for Solving the Problem) The piston ring of the internal combustion engine according to the present invention is characterized in that a large number of pockets are continuously provided along the circumferential direction on the ring upper surface after the second ring excluding the top ring. There is.

(Operation) In FIG. 2, the gap is angle-cut and the gap is
A jet jet of high-temperature and high-pressure combustion gas flowing out through 10 collides with this pocket and the force causes the 2nd ring to rotate forcibly in one direction, causing the ring to break like a conventional piston ring. And abnormal wear can be prevented. Note that the same operation is performed for piston rings that are 2nd ring and smaller.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS.

The present invention is characterized by arranging a large number of pockets 8 and 9 along the circumference of the ring upper surface of the second ring 7b and below excluding the top ring 7a in a piston ring of an internal combustion engine with an angle cut at the abutment.

FIG. 1 is a perspective view showing a situation in which the pocket 8 of the present invention is provided on the 2nd ring.

3 to 4 show the ideal first shape of the pocket 8.
It is a detailed view of an example, one side is formed as a 90 ° wall, and the other is formed as an inclined surface of 30 °.

5 to 6 show the shape of the pocket 9 hollowed out in a cylindrical shape in the second embodiment.

Next, the operation of the above embodiment will be described.

In FIG. 2, the combustion gas w of high temperature and high pressure flows out from the gap 10 of the angle-cut top piston ring 7a as a high temperature and high pressure jet flow, and this jet flow collides with the pocket 8 of the 2nd ring 7b and the 2nd ring Move in the direction of the arrow on the circumference. Similarly, since the piston ring of the 2nd ring or less also rotates in the circumferential direction, it does not cause breakage or abnormal wear unlike the conventional ring.

[Effect of device]

In the piston ring of the internal combustion engine according to the present invention, since the piston ring after the 2nd ring always rotates in the circumferential direction during the operation of the engine, the ring does not locally become hot and abnormal wear can be prevented. Also, by adopting the above configuration, the wear rate of the ring becomes slower, the expansion of the abutment clearance after the 2nd ring is suppressed, the increase in gas leakage is not seen even after long-term operation, and the durability of the ring liner is expected to improve. it can.

[Brief description of drawings]

1 to 6 relate to the present invention. FIG. 1 is a perspective view of a 2nd ring, FIG. 2 is an explanatory view of the operation of this embodiment, and FIG. 3 is a perspective view of a pocket portion of the first embodiment. FIG. 4 is a sectional view of the same pocket, FIG. 5 is a perspective view of the pocket shape of the second embodiment, FIG. 6 is a sectional view of the same pocket shape, and FIG. 7 is a sectional view of a conventional example. 7a …… Top ring, 7b …… 2nd ring, 8,9 …… Pocket, 10 …… Abutment clearance.

Claims (1)

[Scope of utility model registration request] 1. An internal combustion engine in which a plurality of pockets are continuously provided along the circumference of the upper surface of the second and subsequent rings excluding the top ring, in the case where the abutment of the pin ring is angle cut. The piston ring