JPH0121164Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a wear ring, and more particularly to an improvement in a wear ring made of an aluminum alloy.

Conventionally, reciprocating internal combustion engines have used pistons made of aluminum alloy. Use of this aluminum alloy piston is effective in reducing engine weight and improving efficiency.

However, the aluminum alloys conventionally commonly used as pistons for internal combustion engines do not have sufficient heat-resistant strength and wear-resistant properties, and therefore, when used under severe operating conditions, piston rings may not be inserted. Abrasion and deformation occur on the wall surface of the ring groove, especially the lower wall surface, and the function of the piston is likely to be impaired. Therefore, in order to solve the above-mentioned drawbacks of aluminum alloy pistons, an annular body made of a material with good heat resistance and wear resistance properties and high strength is provided in the part where the piston ring is attached.
The use of aluminum alloy pistons with cast-in wear-resistant rings and enhanced heat and wear resistance on the ring groove sidewalls is increasing.

The wear-resistant ring used in this type of aluminum alloy piston needs to be made of a material that has good heat and wear resistance properties and high strength, but it is used after being cast in aluminum alloy. In this regard, it is necessary that the material be made of a material whose coefficient of thermal expansion is close to that of the aluminum alloy.

As a wear-resistant ring that satisfies these requirements, a wear-resistant ring made of high Ni austenitic cast iron called Niresist is generally used.

However, conventionally used wear rings made of high Ni austenitic cast iron contain a large amount of expensive Ni and are made of materials with poor castability, making them expensive to manufacture and uneconomical, as well as being heavy. Therefore, it is not completely satisfactory from the viewpoint of reducing the weight of the piston.

In view of the above, this invention was made for the purpose of providing a wear-resistant ring that has the above-mentioned characteristics required for a wear-resistant ring and is inexpensive. This invention relates to an aluminum alloy wear-resistant ring having a Zn-plated layer or a Sn-plated layer.

Hereinafter, the present invention will be explained in detail with reference to illustrated embodiments.

The wear ring 1 has hard particles 2, 2 as shown in FIG.
The Zn plating layer 3 is formed on its outer surface. The wear-resistant ring 1 of the present invention has a substrate made of an aluminum alloy, and since the substrate is dispersion-strengthened by fine and uniformly dispersed hard particles therein, its thermal expansion coefficient is equal to that of aluminum. Similar to that of an alloy piston body, it maintains high hardness and strength and does not deform even when exposed to high temperatures during engine operation.

In addition, the wear-resistant ring of the present invention exhibits good wear-resistant properties due to the presence of hard particles 2 that are finely and uniformly dispersed in its matrix, and even when used in pistons used under severe conditions, the wear-resistant ring Abrasion occurring on the groove wall surface can be minimized.

In the present invention, the hard particles dispersed in the aluminum alloy substrate are preferably Si particles having a particle size of at most 15 μm or less, and substantially 5 μm or less. If the particle size of the Si particles is larger than 15 μm, the machinability of the wear-resistant ring deteriorates, manufacturing costs increase, and wear of sliding mating materials such as piston rings and cylinders tends to increase. Therefore, in this invention, the particle size of the Si particles to be dispersed is set to 15 μm.
The following was made. In addition, in the present invention, by finely and uniformly dispersing intermetallic compound particles of at least one of Fe, Mn, and Ni and Al or Si with a particle size of 20 μm or less in the aluminum alloy matrix together with the Si particles. , the high temperature strength and wear resistance properties of the wear ring can be further improved. Fe, Mn, Ni, etc. dispersed in aluminum alloy matrix
The aim of intermetallic compound particles with Al or Si is to increase the high-temperature strength of the wear ring and improve the wear resistance properties at high temperatures by finely and uniformly dispersing them. If the intermediate compound particles are coarse, the effect of dispersion strengthening will not be sufficiently obtained, and machinability will be poor and manufacturing costs will increase. Therefore, in the wear-resistant ring of the present invention, it is desirable that the particle size of these intermetallic compound particles is at most 20 μm or less, and substantially 5 μm or less. The aluminum alloy constituting the substrate 3 of the wear-resistant ring of the present invention is Fe, Mn,
It is made of an Al-Si eutectic alloy containing at least one element of Ni.

Furthermore, the wear-resistant ring 1 of the present invention has Zn on its outer surface.
A plating layer or Sn plating layer 6 is formed.
The wear-resistant ring is cast in the area where the first pressure ring of the piston made of aluminum alloy is mounted, and is used by cutting a ring groove 5 for the piston ring (first pressure ring). The wear-resistant ring 1 has a Zn plating layer or a Sn plating layer 6 on its outer surface, which prevents the formation of an oxide film, and when it is cast into the piston body, it is completely diffusion bonded and integrated. It is enveloped in This is not only advantageous in enabling a strong connection between the wear ring and the piston body, but is also effective in improving the heat release characteristics from the piston to the piston ring and reducing the heat load on the piston. .

As explained above, the wear ring of the present invention is substantially made of an aluminum alloy, and its coefficient of thermal expansion is close to that of the piston body. Therefore, heating. Even if cooling is repeated, the wear ring will not separate from the piston body.

In addition, the wear-resistant ring of the present invention has a microstructure in which hard particles are finely and uniformly dispersed in a matrix made of an aluminum alloy, so it has high high-temperature strength and good wear-resistant properties. On the outer surface
Since a Zn plating layer or a Sn plating layer is formed, it is diffusion bonded and cast into the piston body. Therefore, the ring groove will not be worn or deformed even when used under severe operating conditions.

Next, a method for manufacturing the wear ring of the present invention will be described. The inventors of the present invention previously proposed ``heat-resistant, wear-resistant, high-strength aluminum alloy powder, compacted body of said alloy powder, and manufacturing method thereof'' (Japanese Patent Application No. 119901/1982 and Japanese Patent Application No. 119902/1983).

The wear-resistant ring of the present invention can be easily manufactured, for example, according to the method for manufacturing a heat-resistant, wear-resistant, high-strength aluminum alloy powder compact.

That is, Si10.0~30.0% and Fe3.0~15.0% by weight.
%, 1 of Mn5.0~15.0% or Ni5.0~15.0%
Seed or higher (however, the total of Ni + Fe + Mn is 6.0 to 15.0%)
It is desirable to do so. ) and, if necessary, 0.5 to 5.0% Cu and 0.3 to 3.0% Mg, is dispersed and rapidly solidified to obtain an alloy powder, and then the obtained alloy powder is hot extruded. After forming a cylindrical body, the cylindrical body is cut into rings to form an annular body. Next, a wear-resistant ring 1 can be obtained by forming a Zn plating layer or a Sn plating layer 6 on the outer surface of the annular body by a conventional method such as melt-melting.

In the case of the above method, hard and fine primary crystal Si
Particles 2 and intermetallic compound particles 22 of Fe, Mn, Ni, etc., and Al or Si form a microstructure in which they are finely and uniformly dispersed in an Al-Si eutectic alloy matrix containing Fe, Mn, Ni, etc. , Zn plating layer or Sn on the outer surface
A wear-resistant ring having a plating layer 6 can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the wear ring. FIG. 2 shows the structure of the wear ring of the present invention. Figure 3 is a cross-sectional view of the wear ring. FIG. 4 is a sectional view of a piston with a wear-resistant ring. In the figure: 1... wear-resistant ring, 2... hard particles, 22...
...hard particles, 3...aluminum alloy substrate, 4...
...Piston, 5...Ring groove, 6...Plating layer.

Claims (1)

[Claims for Utility Model Registration] (1) A ring made of an extruded Al alloy powder made by dispersing and rapidly solidifying a molten Al alloy containing at least Si so that hard fine particles are finely and uniformly dispersed. A wear-resistant ring with a Zn or Sn plating layer on the outer surface. (2) The wear-resistant ring according to item 1, wherein the hard fine particles are Si particles with a particle size of 15 μm or less. (3) The wear resistance according to item 1, wherein the hard fine particles are Si particles having a particle size of 15 μm or less, and intermetallic compound particles of Al or Si and at least one of Fe, Mn, and Ni and having a particle size of 20 μm or less. ring.