JPH04133063U - Piston ring with coil expander - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent oil from rising in the intermediate ring portion and reduce oil consumption. [Structure] Two compression rings 2 and 3 and one oil ring 4 are attached to a piston 1. second ring 3
has an undercut shape with an interrupted outer periphery, and the abutment structure includes a notch 9 that is open to the ring outer circumferential surface 5 and the abutment end surface on the ring top surface 7 at one abutment end, and a notch 9 at the abutment end surface of the other abutment end. A protrusion 11 disposed in the portion 9 is formed.
A coil expander 16 is attached to the inner periphery of the second ring 3, and the second ring 3 is pressed radially outward, so that the outer peripheral surface 5 of the ring is pressed against the inner wall surface 22 of the cylinder.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is an intermediate ring installed between the top ring and oil ring of an internal combustion engine. For example, second ring, etc.

0002

[Conventional technology]

Generally, internal combustion engines have one or more intermediate rings between the top ring and the oil ring. Rings are provided, such as a top ring, second ring, and oil ring. In the case of a three-ring configuration, there is not enough space for the oil scraped off by the second ring to collect. When this happens, the pressure increases and the oil may flow back upwards. Path through the outer sliding surface Route passing through the abutment There is.

0003 Therefore, by making the outer periphery of the second ring into an interrupted undercut shape, The volume of the space where the oil accumulates is increased to prevent the pressure from increasing. is publicly known. In addition, by devising the structure of the abutment, we have created a path that passes through the abutment. There are also known ones that block the In other words, the outer periphery is placed on the upper surface of one abutment end. It is provided with a cutout that opens on the surface and the end face, and is arranged in the cutout on the end face of the other abutment end. By providing an abutment structure with a protrusion that allows the upper surface of the ring to When it comes into close contact with the surface, the abutment gap on the top surface is closed, blocking the path for oil to pass through the abutment. It is something that

0004

[Problem that the idea aims to solve]

However, the above measures alone may not be sufficient. Therefore, this idea was revised. This prevents oil from flowing through the outer sliding surface, further reducing oil consumption. aimed to.

[0005]

[Means to solve the problem]

The present invention is an intermediate ring provided between a top ring and an oil ring. , the outer periphery has an interrupted undercut shape, and the abutment part has an outer circumferential surface on the top surface of one abutment end. and a cutout that opens on the end face, and a cutout that opens on the end face of the other abutment end. It has an abutment structure with a protrusion that is arranged, and an intermediate ring is placed on the inner circumference of this intermediate ring. It is characterized by comprising a coil expander that urges the coil radially outward.

[0006]

[Effect]

Intermediate rings, such as second rings, have interrupted undercut shapes and predetermined fittings. In addition to the effect of reducing oil consumption by providing a mouth structure, this invention By including an expander, the intermediate ring can be used more easily than the intermediate ring alone. Even if the thickness is made thinner, the tension applied to the outside by the coil expander is increased. This improves the followability of the intermediate ring to the cylinder inner wall surface and increases the surface pressure. This prevents oil from flowing through the outer circumferential surface of the ring, further reducing oil consumption. Wear.

[0007]

【Example】

An embodiment of the present invention will be described below based on the drawings. Figure 1 shows a pin with a three-ring configuration. FIG. 2 is a sectional view of the main part of the stone, and FIG. 2 is a perspective view showing the abutment part of the second ring.

[0008] In Fig. 1, there are two compression ring grooves 2A, 3A and one compression ring groove on the outer peripheral surface of the piston 1. An oil ring groove 4A is formed, and a top compression ring groove 2A is formed in the uppermost compression ring groove 2A. Ring 2 is in the compression ring groove 3A below it, and second ring 3 is in the compression ring groove 3A below it. An oil ring 4 is attached to the oil ring groove 4A.

[0009] The top ring 2 has a barrel-shaped outer periphery and a right-angled abutment structure, and the outer periphery of the ring is shaped like a cylinder. It is pressed against the inner wall surface 22 of the cylinder 21. Second ring 3 has an under-interrupted outer circumference. It has a cut shape and a special joint structure. The interrupted undercut shape is shown in Figure 2. As shown in FIG. It was formed over a period of time. The abutment structure is as shown in Figure 2. A notch 9 is formed on the ring top surface 7 at the abutment end that opens to the ring outer peripheral surface 5 and the abutment end surface 8. and a notch is provided at a position opposite to the notch 9 on the abutment end face 10 of the other abutment end. A protrusion 11 disposed in the portion 9 is formed to protrude. The notch 9 and the protrusion 11 are half-shaped. The vertical cross section cut in the radial direction has the same triangular shape, and it projects on the slope 12 of the notch 9. The slope 13 of the exit part 11 is arranged, and there is a predetermined abutment gap between both the abutment end surfaces 8 and 10. It is attached to the ring groove 3A.

0010 Note that although the cross-sectional shapes of the notch 9 and the protrusion 11 are triangular in the above description, However, the shape is not limited to this, and the shape may be any other shape, such as a rectangular shape.

[0011] The inner circumferential surface 14 of the second ring 3 has a groove 15 having an arcuate cross section all around the circumference. A coil expander 16 is installed in this inner circumferential groove 15, and a coil expander 16 is installed in this inner circumferential groove 15. The second ring 3 is pressed radially outward by the oil expander 16, The ring outer circumferential surface 5 is pressed against the inner wall surface 22 of the cylinder 21 .

0012 Therefore, the thickness of the second ring 3 is better than that of the second ring alone. Even if it is made thinner, the tension applied to the outside by the coil expander 16 can be increased. This improves the followability of the second ring 3 to the cylinder inner wall surface 22 and increases the surface pressure. This prevents oil from rising through the ring outer circumferential surface 5, reducing oil consumption. can.

[0013] Oil ring 4 is a two-piece steel combination oil ring, with rails 1 on top and bottom. 7, 18 and an oil ring body 19 having a substantially I-shaped cross section; It consists of a coil expander 20 fitted on the inner periphery of the rails 17 and 18. is pressed against the inner wall surface 22 of the cylinder 21 by the coil expander 20.

[0014]

[Effect of the idea]

As explained above, according to the present invention, the intermediate ring such as the second ring Oil dissipation is achieved by providing an interrupted undercut shape and a predetermined abutment structure. In addition to the cost reduction effect, this invention has a coil expander, which reduces intermediate costs. By improving the ring's ability to follow the cylinder's inner wall surface and increasing the surface pressure, the outer circumference of the ring This prevents oil from flowing through the surface, further reducing oil consumption.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a main part of a piston having a three-ring configuration.

FIG. 2 is a perspective view showing an abutment portion of the second ring.

[Explanation of symbols]

1 piston 2 Top ring 2A, 3A, 4A ring groove 3 Second ring 4 Oil ring 5 Ring outer surface 6, 9 Notch 7 Top of ring 8, 10 Abutment end face 11 Projection part 12, 13 Slope 14 Ring inner surface 15 Ring inner groove 16, 20 Coil expander 17, 18 rail 19 Oil ring body 21 cylinder 22 Cylinder inner wall surface

Claims (1)

[Scope of utility model registration request] [Claim 1] An intermediate ring provided between a top ring and an oil ring, wherein the outer periphery has an interrupted undercut shape, and the abutment part is open to the outer circumferential surface and the end face on the upper surface of one abutment end. A coil extractor having an abutment structure including a notch and a protrusion disposed in the notch on the end face of the other abutment end, and biasing the intermediate ring radially outward on the inner periphery of the intermediate ring. A piston ring with a coil expander characterized by having an expander.