JPH0342032Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Field of Application) The present invention relates to a sliding member, and more particularly to a sliding member in which a sliding surface of thermal spray material is exposed on the inner wall surface.

(Conventional techniques and their problems) Thermal spraying methods, in which a sprayed material such as metal, alloy, or ceramics is melted and sprayed onto the base material to form a sprayed material layer on the surface of the base material, cause the surface of the sprayed material layer to harden and Since the thermal spray material layer is generally porous and oil-retaining, it has come to be widely used in various industries such as the aircraft industry and the automobile industry as various sliding members and sliding members.

In conventional thermal spraying, the surface of the base material is generally cleaned by carefully pre-treating it by grit blasting, etc., and then the spraying material is directly sprayed onto the cleaned base material surface from a spray nozzle to remove the base material. A sprayed material layer was formed on the surface.

This bonding between the base material and the sprayed material layer is mechanically and physically achieved by the smearing of the sprayed material onto the surface of the base material, which has irregularities on the micron scale due to the above-mentioned pretreatment such as grit blasting.

For this reason, in the thermal spraying method, although the thermal spraying material layer has the above-mentioned excellent properties, there has always been a problem that the thermal spraying material layer tends to separate from the base material. Because the bonding strength of the sprayed material layer to the base material is low,
When strong impacts are repeated, especially at points or lines, such as on the shell of a steel rolling roll, the sprayed material layer may chip or peel, or cracks may occur, and continued use may cause the cracks to spread further. It has defects and is unusable.

Moreover, especially when the thermal spraying material is ceramic, ceramics are inherently brittle, so ceramics are likely to chip in bearings and the like that are thermally sprayed with ceramics.

Furthermore, conventional sliding members of this type only have a thermal sprayed material layer formed on the outer surface of the member.
For example, there is no thermal sprayed material layer formed on sliding surfaces such as the inner wall surface of the cylinder or the inner wall surface of the shaft hole of the bearing.

The present invention has been devised to solve the above-mentioned problems, and its purpose is to provide a sliding member that has high joint strength of thermal sprayed materials and can be easily manufactured.

(Means for Solving the Problems) In the sliding member according to the present invention for the above-mentioned purpose, a large number of through holes are bored in the outer wall of the cylindrical body with an appropriate distribution, and the inner wall of the cylindrical body is located inside the through holes. It is characterized in that it is filled with thermal spray material so that the sliding surface protrudes in the opposite direction, and that the cylindrical body is fitted into a hole provided in the support body.

(Function) Since the sliding surface of the thermal spray material protrudes from the inner wall of the cylinder, a sliding object such as a piston or a rotating object such as a rotating shaft that slides on the cylinder slides or rotates smoothly. Since the sprayed material is filled in the through holes of the cylinder, the bonding strength with the cylinder is high.

(Embodiments) Hereinafter, preferred embodiments of the present invention will be described in detail based on the accompanying drawings.

In FIG. 1, 30 is a cylindrical body, and a large number of through holes 22 are formed in an appropriate distribution on the outer wall surface of the cylindrical body. The cylinder 30 may be a cylinder or a polygonal cylinder, and its shape is not particularly limited. Of course, one end may be closed depending on the use. Further, the material of the cylinder 30 is not particularly limited either.

The through hole 22 may have any shape, such as circular or square, but it is preferably conical with a trapezoidal cross section as shown in FIG.

Reference numeral 24 denotes a sprayed material, which is filled into the through hole 22. During thermal spraying, another cylindrical body is slid inside the cylindrical body 30 and used as a patch plate, and a thermal spraying material is sprayed from outside the cylindrical body 30 to form a thermal sprayed material inside the through hole 22 . After thermal spraying, remove the above caul plate. The inner end side of the sprayed material 24 is made to protrude inward from the inner wall of the cylinder 30, and serves as a sliding surface for a sliding object that slides within the cylinder 30 or a rotating object that rotates.

The sprayed material may be sprayed so as to cover the entire outer wall surface of the cylinder 30, or may be sprayed so as to fill only the inside of the through hole 22.

32 is a support cylinder serving as a support for the cover;
The cylindrical body 30 is fitted and fixed into this support cylindrical body 32. This support body is not a cylindrical body, but may be, for example, the main body of a bearing, and the cylindrical body 30 may be fitted and fixed into the hole thereof.

In the embodiment shown in FIG. 3, the sprayed material 24 filled in the through hole 22 is formed to be one step lower than the outer surface of the cylinder 30, and when the cylinder 30 is inserted into the support cylinder 32, there is no space. Part A is formed. By filling this space A with lubricating oil, the lubricating oil permeates into the small pores of the thermal spray material 34 to further improve the lubricity.

The sliding member configured as described above can be widely used in cylinder devices, bearings, and other places where the inner wall surface of the cylindrical body 30 serves as a sliding surface or sliding surface.

(Effects of the invention) As described above, according to the invention, a sliding member in which the sliding surface of the thermal spray material is exposed on the inner wall of the cylinder has been provided for the first time.

In addition, manufacturing is easy because it is sufficient to fill the through hole provided in the cylindrical body with the sprayed material and then fit and fix the cylindrical body into the hole of the support.

Furthermore, since the sprayed material is filled in the through-holes of the cylinder, the strength of the bond with the cylinder is increased, and the peeling, chipping, and cracking of the sprayed material can be effectively prevented, which has many practical benefits. It is.

[Brief explanation of the drawing]

FIG. 1 is an assembled view showing an embodiment of the sliding member according to the present invention, and FIG. 2 is a partial sectional view thereof. Third
The figure is a partial sectional view showing another embodiment. 22...Through hole, 24...Sprayed material, 30...Cylinder body, 32...Support cylinder body.

Claims (1)

[Scope of utility model registration request] A large number of through holes are formed in the outer wall of the cylinder with an appropriate distribution, and the thermal spray material is filled into the through holes so that the sliding surface protrudes inward from the inner wall of the cylinder, and the cylinder is attached to a support. A sliding member fitted into a provided hole.