JPS58221069A - Endless piston ring - Google Patents

Abstract

PURPOSE:To prevent an increase of frictional loss of a ring, by providing a part, in which several notches are alternately internally and externally provided to be closely placed, partly to a main unit of the endless ring and absorbing extension and contraction of the ring due to thermal expansion or the like. CONSTITUTION:U-shaped narrow notches 2-5 are provided to a part of the main unit of an endless piston ring 1 with a rectangular section. These notches are alternately internally and externally provided and closely placed. A notched part 6 equipped with such notch is provided to the endless piston ring 1. When an external diameter of the ring 1 fitted into a cylinder is changed for an internal diameter of the cylinder due to a tempeature rise, this change is absorbed by deforming the notched part 6 equipping the many notches 2-4 to a spring shape.

Description

[Detailed Description of the Invention] A differential used in a Stirling engine, etc. Conventional piston rings made of ron, rulon, etc., have cuts that cause a large amount of gas leakage.
All continuous piston rings have definite drawbacks, such as a sharp increase in ring friction loss due to overhang due to thermal expansion.

The present invention provides a part of the main body of the end ring with a part in which several notches are closely arranged alternately inside and outside, and this part absorbs the expansion and contraction of the ring due to thermal expansion, etc., thereby increasing the friction loss of the ring. The present invention relates to a piston ring that prevents gas from leaking and that can minimize gas leakage by combining two or more such rings.

The invention will be explained with the aid of figures. FIG. 1 is a plan view of a piston ring according to an embodiment of the present invention, and FIG.
FIG. 3 is a partial cross-sectional view of the embodiment shown in the figure, viewed from the X direction. FIG. 8 is a longitudinal sectional view showing a state in which two piston rings of the embodiment shown in FIG. 1 are combined and mounted on a piston in a cylinder.

In Figures 1 and 2, ■ is an endless piston ring with a rectangular cross section, and 2.3゜4.5 etc. is a narrow U-shaped cross section provided in a part of the main body of the piston ring l. These are notches, which are placed close to each other alternately from the inside and outside as shown in the figure. Reference numeral 6 indicates the cut portion where these cuts exist, and 7 is a small hole for a rotation stopper pin.

Now, the main functions of this piston ring are as follows. In other words, when the ring 1 fitted in an arbitrary cylinder tries to expand or contract its outer diameter with respect to the cylinder's inner diameter due to a rise in temperature, the expansion or contraction is performed by cutting the ring 1 with a large number of notches 2, 8, 4, etc. It exists at the point where the portion 6 absorbs by expanding and contracting like a spring.

In addition, FIG. 8 shows the endless screw of the embodiment shown in FIG. A partial cross-sectional view of an embodiment in which the two are combined as a rotation stopper so that they are at positions deviated from each other by 180 degrees, and are fitted into a ring groove 13 provided in a piston 12 and housed in a cylinder inner surface 14. This shows that. At this time, the ring groove 18 is an assembled type in which the groove cap 1'5 can be pulled up and disassembled by removing the screws 16, 17, etc. that fix it. In this case, as shown in the figure, the piston rings 1 and 8 are pressed against the lower wall 20 of the groove and the cylinder inner surface 14 by gas pressure, and the notch 6 of the ring 1 is closed by the body of the ring 8. Since the notched portion 9 of the ring 8 is closed by the main body of the ring 1, leakage and expansion of gas passing through this composite ring is almost prevented.

Therefore, the leakage prevention effect of the piston ring of the present invention is established.

As described above, by using two or more endless piston rings according to the present invention as shown in Fig. 8, both flexibility and leakage prevention, which could not be achieved with conventional piston rings, can be simultaneously achieved. This makes it possible to obtain the optimum piston ring, especially for applications such as Stirling engines.

In addition, in the piston ring according to the present invention, it is possible to provide one or more notches in one ring,
Furthermore, it is also possible to freely combine one or more piston rings according to the present invention, or to use them in multiple stages.
Any material may be used as long as it is flexible, and the shape of the incision is also free. Moreover, either the inner or outer surface may be slid.

[Brief explanation of the drawing]

FIG. 1 is a plan view of one embodiment of the present invention, and FIG. 2 is a partial sectional view of the embodiment of FIG. 1 viewed from the X direction. 8th
The figure is a longitudinal cross-sectional view showing a situation in which two piston rings of the embodiment shown in FIG. 1 are combined and installed in a cylinder. 1.8...Endless piston ring! , 8.4
．． 5...U-shaped notch, 6...notch part,
1z... Piston/procedural amendment December 21, 1980 Kazuo Wakasugi, Commissioner of the Patent Office 1, Indication of the case 1983 Patent Application No. 103074 2, Name of the invention Endless Piston Ring 3, Make amendments Patent applicant 4, date of amendment order voluntary amendment 5, number of inventions increased by amendment 06, application subject to amendment and full text amended specification (engraving amendment)

Claims (1)

[Claims] The ring body is made of flexible material and has a rectangular cross section with an unbroken ring shape.
An endless piston ring that has one or several portions in which several letter-shaped notches are alternately provided closely from the inside and outside, and a composite piston ring that is a combination of the piston rings.