JPH04116063U - Oil ring with coil expander - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce wear on the part corresponding to the inner peripheral side of the abutment of the oil ring body of the coil expander. [Structure] The oil ring body 1 is a ring with a substantially I-shaped cross section, and the coil expander 1 is disposed in a fitting groove on the inner circumferential surface.
2 presses the ring body 1 outward in the radial direction to press the outer peripheral sliding surface of the ring body 1 against the inner wall surface of the cylinder. In this case, the abutment of the ring body 1 is arranged on the opposite side of the abutment of the coil expander 12. The entire surface of the coil expander 12 is coated with TiN, TiC, Ti(C,N), and C.
A PVD treated film of r _x N _y , Cr _x C _y, etc. is formed. In addition, the coil pitch in a range of 45 degrees on both sides centering on the side 180 degrees opposite to the abutment is made smaller and denser than the coil pitch in other parts, and the spring constant is partially reduced. It has good followability to the parts.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to an oil ring with a coil expander for an internal combustion engine.

0002

[Conventional technology]

Oil rings with coil expanders are mainly used for diesel engines. However, the oil ring body is made of martensitic steel to improve durability. Nitrided rings subjected to nitriding treatment are increasingly being used.

0003

[Problem that the idea aims to solve]

However, since the entire surface of the nitrided ring is nitrided, the coil expander does not come into contact with it. The nitrided surface also becomes the nitrided surface. As a result, it corresponds to the inner circumference of the abutment of the ring body. The wear on the coil expander is increasing. Currently, the coil expander Hard chrome plating or tuftride treatment is applied to piano wire or SUS304 material. However, if the ring body is nitrided, it has poor wear resistance. Sometimes it's not enough.

0004 This invention was made in view of the above points, and a nitride ring is used in the oil ring body. Even when used, a coil expander corresponding to the inner circumference of the abutment of the ring body The purpose is to reduce wear on the parts.

[0005]

[Means to solve the problem]

The structure of this invention is a coil expander that presses the oil ring body outward. In an oil ring with a coil expander, the coil expander is small. At least a hard PVD treated film is formed on the surface that contacts the oil ring body, and Adjust the coil pitch on the side opposite to the abutment of the coil expander to the coil pitch on other parts. It is characterized by being smaller than Chi.

[0006]

[Effect]

At least the surface of the coil expander that contacts the oil ring body is coated with PVD such as TiN, TiC, Ti(C,N), Cr _x N _y , Cr _x C _y , etc., which has better wear resistance than tuftride or hard chrome plating. Since a treated film is formed, wear resistance is improved.

[0007] In addition, coil expanders have excellent flexibility and better followability. However, wear can be reduced by partially increasing followability. That is, The coil pitch on the side opposite to the abutment of the expander is the same as the coil pitch on the other side. Since the spring constant of that part is smaller, as a result, the oil ring The followability of the coil expander part corresponding to the joint part of the main body is improved, and the oil The relative movement between the ring body and the abutment part can be reduced, and the oil ring of the coil expander can be It is possible to reduce wear on the part corresponding to the inner circumferential side of the abutment part of the main body.

[0008] In addition, in the above, if all the coil expanders are set to the above small pitch, , problems such as sludge becoming easily clogged between the pitches of the coils occur, so Unfavorable from the viewpoint of adhesion and sludge.

[0009]

【Example】

Hereinafter, one embodiment of the present invention will be described based on the drawings. Figure 1 shows coil expansion FIG. 2 is a plan view of the oil ring with a dowel, and FIG. 2 is a sectional view thereof.

0010 The oil ring body 1 has upper and lower side rails 2 and 3, and a thin wall that connects these. A ring with an approximately I-shaped cross section consisting of a straight column 4, and the upper and lower side rails 2, 3, the outer peripheral surface of the part that protrudes outward from the column 4 is pressed against the inner wall surface of the cylinder. forming the sliding surfaces 5 and 6 that are exposed to the surface, and the opposing slopes of the portions that protrude inwardly from the column portion 4. The wall surfaces 7 and 8 and the inner wall surface 9 of the column part 4 form a fitting groove 10 for the coil expander. There is. A large number of oil holes 11 are provided in the column 4 at intervals in the circumferential direction. It is.

[0011] This oil ring body 1 is formed by fabricating an irregular wire rod having the cross-sectional shape shown in FIG. 2, and subjecting the irregular wire rod to prescribed processing and treatment. The hard and brittle surface oxide layer and white layer of the nitrided layer generated by the nitriding treatment were removed to form an effective nitrided layer having a hardness of _HV 700 to 1250 and a thickness of 90 μm.

0012 The coil expander 12 has an annular shape and is fitted around the inner periphery of the oil ring body 1. It is disposed in the groove 10 and presses the oil ring main body 1 radially outward to provide the above-mentioned support. The outer peripheral sliding surfaces 5 and 6 of the idle rails 2 and 3 are brought into pressure contact with the inner wall surface of the cylinder. in this case , the abutment of the oil ring body 1 is placed on the opposite side of the abutment of the coil expander 12. (See Figure 1). Note that 13 is inserted across the abutment of the coil expander 12. This is the guide rod that was placed.

A PVD treated film of TiN, TiC, Ti(C,N), Cr _x N _y , Cr _x C _y , etc. is formed on the entire surface of the coil expander 12, and as shown in FIG. As shown, the coil pitch in a range of 45 degrees on both sides of the side 180 degrees opposite to the abutment is smaller than the coil pitch in other parts, and is formed densely. Therefore, in the part of the coil expander 12 that contacts the abutment part of the oil ring body 1, the coil pitch is formed densely, so the spring constant is partially reduced, and the followability to the abutment part of the ring body 1 is good. become. Due to this good followability and hard PVD treated film, wear of the portion of the coil expander 12 corresponding to the abutment of the oil ring body 1 can be reduced.

[0014] The results of the wear test will be explained below. The engine is 119mmφ, operating condition The case is 2500rpm x Full and 1000Hr, and the oil ring body is as above. It is a ring with a structure that has undergone tufftride treatment on the entire surface, and is a coil expander. In the conventional example, the coil pitch is 2.2 mm, and the entire surface is treated with tuftride (thickness 2 0 μm), and the comparative example is a coil pin in a range of 45 degrees on both sides centered on the opposite side of the abutment. The pitch is 1.5mm, the coil pitch in other parts is 2.2mm, and the entire surface is tufted. treatment (thickness: 20 μm), this invention focuses on the opposite side of the abutment and covers a 45-degree range on both sides. The coil pitch of the surrounding area is 1.5mm, and the coil pitch of the other part is 2.2mm. It is a PVD-treated TiN (thickness: 5 μm). Figure 3 shows each coil expander. This shows the amount of wear on the part corresponding to the inner circumferential side of the abutment of the oil ring body. look at this Therefore, the coil expander of the present invention is compared to the conventional and comparative coil expanders. It can be seen that the wear is reduced in all cases.

[0015]

[Effect of the idea]

As explained above, according to the present invention, the coil expander is treated with hard PVD. The coil expander In the attached oil ring, there is a The wear of corresponding parts can be reduced.

[Brief explanation of drawings]

FIG. 1 is a plan view of an oil ring with a coil expander.

FIG. 2 is a sectional view of an oil ring with a coil expander.

FIG. 3 is a graph showing the results of a wear test.

[Explanation of symbols]

1 Oil ring body 2 Side rail 3 Side rail 4 Pillar part 5 Sliding surface 6 Sliding surface 7 Slanted wall surface 8 Slanted wall surface 9 Column inner wall surface 10 Fitting groove 11 Oil hole 12 Coil expander 13 Guide rod

Claims (1)

[Scope of utility model registration request] Claim 1: An oil ring with a coil expander that has a coil expander that presses the oil ring body outward, wherein a hard PVD treated film is formed on at least the surface of the coil expander that contacts the oil ring body. An oil ring with a coil expander, characterized in that the coil pitch at the side opposite to the abutment of the coil expander is smaller than the coil pitch at other parts.