JPH0512841U - Wire rod for piston ring - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a wire rod for a piston ring that enables weight reduction of the piston ring without causing fluttering. [Structure] S is formed on the outer periphery of the core made of Al or Al alloy.
The outer layer portion made of i-Cr steel is integrally formed to be a composite steel wire.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 TECHNICAL FIELD The present invention relates to a piston ring wire used as a material for a piston ring used in an internal combustion engine, and particularly relates to a piston ring wire that has been reduced in weight.

[0002]

[Prior Art]

 The piston ring is used to prevent the leakage of compressed gas in the cylinder, and is fitted in the ring groove provided on the outer peripheral wall surface of the piston ring. It slides.

In recent years, as the performance of internal combustion engines has increased, piston rings have been strongly desired to be lightweight in order to reduce fuel consumption and achieve high-speed rotation. For this reason, the piston ring progresses toward thinning, the material of the piston ring shifts from cast iron, which is difficult to thin in terms of workability and strength, to steel, and the piston ring manufacturing method also has the required cross-sectional shape. Piston ring wire rod made of steel is formed into a ring shape by coiling, and then surface treated to impart wear resistance.

As shown in FIG. 3, the conventional piston ring wire 6 is made of steel (mainly Si-Cr steel, piano wire) having a substantially rectangular cross section. Further, in the conventional method of manufacturing the piston ring wire 6, the φ5.5 mm wire is repeatedly heat-treated and wire-drawn several times to reduce the wire diameter, and then is rolled into a desired cross-sectional shape. Then, as a finishing treatment, quenching and tempering treatment was performed to impart strength and heat resistance.

[0005]

[Problems to be solved by the device]

 The conventional piston ring wire is designed to be lighter by making the piston ring thinner when it is made into a piston ring by reducing the thickness of the wire. However, if the plate thickness of the piston ring is made thin, the strength decreases, and the high-speed sliding of the piston causes a so-called fluttering in which the piston ring undulates in the vertical direction, so that the piston ring functions sufficiently. There was a limit to thinning because it could not be fulfilled.

Further, in order to reduce the weight of the piston ring, a method of coiling a long pipe having a rectangular cross section has been attempted, but there is a problem that the cross sectional shape is collapsed in the coiling process. , Has not been put to practical use.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a piston ring wire rod that enables weight reduction of the piston ring without causing fluttering. ..

[0008]

[Means for Solving the Problems]

 The piston ring wire according to the present invention comprises a composite steel wire in which an outer layer part made of Si—Cr steel is integrally formed on the outer periphery of a core part made of Al or Al alloy.

[0009]

[Action]

 In the piston rod wire according to the present invention, the weight of the piston ring wire is reduced by making the core part lightweight Al or an alloy containing Al as a main component. Moreover, strength and heat resistance are secured by forming the outer layer portion of Si—Cr steel into a pipe shape having excellent bending rigidity. Further, by using Al or an alloy containing Al as a main component and Si—Cr steel which have good workability, wire rod processing and piston ring processing are facilitated.

[0010]

【Example】

 A wire rod for a piston ring according to an embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 is a piston ring wire used as a pressure ring. The piston ring wire 1 is formed by integrally molding a core portion 2 made of Al and an outer layer portion 3 made of Si—Cr steel. Consists of That is, Si-Cr steel is melted and then cast into a pipe shape. Then, melted Al is injected into the hollow portion of the pipe, and heat treatment, rolling, and wire drawing are performed to form a wire of φ3.0 mm. After that, the above-mentioned wire rod is deformed and rolled, and the thickness of the core portion made of Al is placed inside the outer layer portion 3 made of Si-Cr steel having the wire rod thickness dimension A = 1.3 mm and the wire rod width dimension B = 2.8 mm. A composite steel wire having a substantially rectangular cross section is formed by integrally molding the core 2 having C = 0.7 mm and core width D = 2.1 mm. Then, as a finishing treatment, quenching and tempering treatment is performed to impart straightness and strength to the outer layer portion to form the piston ring wire 1. It is also possible to change the above-mentioned deforming rolling process to deforming die wire drawing, and to process the cross-sectional shape of the wire into a rectangular shape.

By the way, when the piston ring wire is formed into a piston ring, in order to satisfy the strength required for the piston ring, that is, the spring property, (core thickness dimension D × core width dimension E) / ( It is more preferable to have a cross-sectional shape satisfying the formula: wire thickness dimension A × wire width dimension B) ≦ 2/3. Further, instead of Al, the core portion 2 can be made of an alloy mainly containing Al, which has good workability.

Next, using the above-mentioned piston ring wire 1 obtained by the present invention, a piston ring 5 having a hard chrome plating 4 on the outer peripheral surface shown in FIG. 2 is manufactured, and a flutter ring as a piston ring is manufactured. The heat resistance was tested and evaluated.

As a result, using the conventional piston ring wire 6 of Si—Cr steel shown in FIG. 3, the piston ring 5 has the same characteristics as a piston ring of the same size plated with hard chrome. I was able to confirm that. It was also confirmed that the weight can be reduced by up to about 40% compared to the conventional piston ring made of a wire rod for piston rings of the same size.

[0015]

[Effects of the Invention] Since the piston rod wire of the present invention has the above-mentioned configuration, it is possible to significantly reduce the weight without causing fluttering, and to significantly improve the high-speed rotation of the internal combustion engine and the reduction of fuel consumption. It has an excellent practical effect that a piston ring exhibiting the effect can be obtained.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing an embodiment of a wire rod for a piston ring of the present invention.

FIG. 2 is a perspective view showing an embodiment of a piston ring using the wire rod for a piston ring of the present invention shown in FIG.

FIG. 3 is a schematic cross-sectional view showing a conventional piston ring wire.

[Explanation of symbols]

 1 Piston Ring Wire 2 Core 3 Outer Layer 4 Hard Chrome Plating 5 Piston Ring 6 Piston Ring Wire A A Wire Thickness Dimension B Wire Width Width C Core Thickness Dimension D Core Width

Claims (1)

[Scope of utility model registration request] 1. A wire rod for a piston ring made of a composite steel wire in which an outer layer portion made of Si—Cr steel is integrally formed on the outer periphery of a core portion made of Al or an Al alloy.