JPH0654920U - Plain bearing - Google Patents

Abstract

(57) [Abstract] [Purpose] In addition to improving impact resistance, it is possible to construct a sliding part with excellent wear resistance by easily overlaying welded hard metal even with a small inner diameter. The dimensional accuracy can be improved and the cost can be reduced. [Structure] In a slide bearing having a sliding portion 2 made of hard metal on an inner peripheral surface of a bearing body 1, a hard metal is welded to the outer peripheral surface of a round bar-shaped core material 3 along the entire circumference with a predetermined axial length. A weld overlay of hard metal, which is exposed by hollowing out and removing the core material from a material A in which a overlay 2A is formed and a weld overlay 1A of a bearing body constituting base material is formed on the outer peripheral side thereof. 2A
The sliding portion 1 is formed from the above, and the main body 1 is configured by processing the outer shape of the weld overlay portion 1A of the base material into a predetermined shape.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a plain bearing which has a relatively small inner diameter and can be used in a pump or the like without lubrication.

[0002]

[Prior art]

 Generally, many sliding bearings of this type are formed by molding a relatively hard sintered body such as silicon carbide or silicon nitride in order to secure the wear resistance of the sliding portion. However, the sliding bearing made of such a sintered body has a drawback that it is inferior in impact resistance due to its material. For this reason, conventionally, there has been known a thermal sprayed bearing in which a relatively hard metal is sprayed on the inner peripheral surface of a bearing body made of metal or the like to form a sliding portion having excellent wear resistance. There is.

[0003]

[Problems to be solved by the device]

 However, in the conventional plain bearing described above, the welding torch must be inserted inside the bearing body when the hard metal is sprayed onto the inner peripheral surface of the bearing body, so if the inner diameter of the bearing body is relatively large. Even if it is possible, there is a problem in manufacturing technology that it is difficult to spray if the inner diameter is small and the axial length is long.

Therefore, the bearing main body is divided into a plurality of pieces in the radial direction, and the hard metal is sprayed on each inner peripheral surface of each of the divided pieces, and then the plurality of divided pieces are integrated and manufactured. However, in this case, the spraying state is likely to vary among a plurality of divided bodies, and as a result, a large error is likely to occur in the inner diameter dimension of the sliding portion. In particular, the smaller the inner diameter, the smaller the clearance between the shaft and the shaft must be set, but it becomes difficult to set the clearance more strictly due to the above-described error in the inner diameter. However, by spraying each divided body, a discontinuous portion is generated in the welding bead in the circumferential direction, and it is difficult to obtain a sliding portion having a uniform thickness and a uniform hardness over the entire circumference. In addition, there is a problem that the manufacturing cost becomes high due to the labor of processing the joining surfaces of the divided bodies and the joining work.

The present invention has been made in order to solve the above problems, and it is excellent in impact resistance and hard metal regardless of the inner diameter of the bearing body. It is an object of the present invention to provide a slide bearing which has a uniform weld overlay and can be easily manufactured to obtain a sliding portion having uniform wear resistance over the entire circumference.

[0006]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the slide bearing according to the present invention is a slide bearing composed of a bearing main body and a hard metal sliding portion formed on the entire inner peripheral surface of the main body of the bearing. On the outer peripheral surface of the core material, a weld overlay of the above-mentioned hard metal is formed over the entire circumference with a predetermined axial length, and on the outer peripheral side thereof, a weld overlay corresponding to the above-mentioned base material for forming the bearing body is formed. The welded build-up portion of the hard metal exposed by hollowing out and removing the core material from the material forming the portion forms the sliding portion, and further the weld build-up portion of the base material. The outer shape of the bearing is processed into a predetermined shape to form the bearing body.

[0007]

[Action]

 According to the present invention, since the bearing main body is composed of the weld overlay of the base body, the impact resistance is improved as compared with that of a sintered body such as silicon carbide. Weld build-up of metal on the outer peripheral surface of a rod-shaped core material, hollowing out and removing the core material to form a slide part from the exposed weld build-up part, regardless of the size of the inner diameter or axial length. Welding work of hard metal can be performed easily. Furthermore, it is not necessary to divide the bearing body into two parts and the hard metal can be welded to the outer peripheral surface of the rod-shaped core material. It is possible to improve the dimensional accuracy of the inner diameter of the sliding part by using a continuous jig, and moreover, a jig for increasing the complexity and manufacturing process such as when combining multiple divided bodies. It becomes unnecessary to reduce the manufacturing cost.

[0008]

Embodiment An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an external perspective view showing a slide bearing according to an embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes a bearing main body made of a base material such as metal, which has a flange portion 1b at one axial end of the cylindrical base portion 1a. Reference numeral 2 denotes a sliding portion formed on the entire inner peripheral surface of the bearing body 1 and made of a hard metal. The sliding portion 2 and the bearing main body 1 are manufactured by processing the integrated material by sequentially welding and overlaying the outer peripheral surface of the round bar core material 3 (FIG. 2). Is.

That is, specifically, as shown in FIG. 2, a hard metal is formed on the outer peripheral surface of a cylindrical or cylindrical round bar-shaped core member 3 made of metal or the like and having an outer diameter substantially close to the inner diameter d of the plain bearing. 2A is welded over the entire circumference with a predetermined length in the axial direction, and as shown in FIG. 3, the base material 1A for forming the bearing body is welded over the entire circumference on the outer circumference side. Material A is prepared by overlaying. Then, the round bar-shaped core material 3 of the material A is hollowed out and removed by cutting or the like to expose the weld overlay 2A of hard metal and polish the inner surface thereof as shown in FIG. The outer shape of the weld overlay portion 1A of the base material is processed into a predetermined shape so that the base portion 1a and the flange portion 1b of the slide bearing remain. As a result, the weld overlay 1A of the base metal constitutes the bearing body 1 as shown in FIG. 1, and the sliding portion formed by the weld overlay 2A of hard metal is formed on the inner peripheral surface thereof. 2 constitutes an integrated slide bearing.

In such a plain bearing, the sliding contact formed by the hard metal weld overlay 2A on the inner peripheral surface of the bearing body 1 formed by molding the outer shape of the weld overlay 1A of the base material. Since the part 2 is integrated, the wear resistance is excellent, and the impact resistance can be improved as compared with that formed of a sintered body such as silicon carbide. Particularly, when the sliding portion 2 is formed, the hard metal is welded on the outer peripheral surface of the round bar-shaped core material 3 and then the round bar-shaped core material 3 is hollowed and removed. Welding can be easily performed regardless of the size of the shaft length, and therefore small size (diameter) can be easily accommodated. Furthermore, by welding the above-mentioned hard metal along the outer peripheral surface of the round bar-shaped core material 3, the state of the weld overlay is made uniform in thickness and uniform in the circumferential direction, so that the inner diameter dimension of the sliding portion 2 varies. Therefore, even if the inner diameter is small, it is possible to set the gap to the shaft minutely and accurately. Further, by forming the weld overlay 1A of the base material for forming the bearing body on the outer peripheral side of the weld overlay 2A of hard metal, the bearing body 1 and the sliding portion 2 are integrated. Therefore, it is possible to reduce the manufacturing cost by omitting the work of highly accurate mating surface processing and assembly required for dividing the bearing main body into a plurality of parts.

[0012]

[Effect of device]

 As described above, according to the present invention, a material is used in which the weld overlay of the hard metal is formed on the outer peripheral side of the round bar-shaped core material, and the weld overlay of the base material of the bearing main body is formed on the upper layer. In addition, since the sliding portion is formed by the weld overlay of the hard metal exposed by hollowing out the round bar core material, the weld overlay of the base metal is formed into the bearing body. In addition to being superior in impact resistance compared to those composed of sintered bodies such as silicon carbide, even if the inner diameter is small, welding overlay on the sliding parts can be done easily and uniformly. It can be installed, and moreover, it is easier to make and the cost can be reduced compared to the case where the bearing main body is divided into a plurality of parts.

[Brief description of drawings]

FIG. 1 is an external perspective view showing a slide bearing according to an embodiment of the present invention.

FIG. 2 is a front view showing a state where a hard metal is weld-laid on a round bar-shaped core material in the sliding bearing according to the embodiment.

FIG. 3 is a front view showing a material in which a base material for forming a bearing main body is weld-laid on the outer peripheral side of a weld-laid hard metal in the slide bearing according to the embodiment.

FIG. 4 is a cross-sectional view showing a state in which the slide bearing of the embodiment has been formed and processed after welding overlay.

[Explanation of symbols]

 1 Bearing main body 1A Welding overlay of base material 2 Sliding part 2A Weld overlay of hard metal 3 Round bar core

Claims (1)

[Scope of utility model registration request] 1. A slide bearing comprising a bearing main body and a sliding portion made of hard metal formed on the entire inner peripheral surface of the bearing main body, wherein a predetermined axial direction is provided on the outer peripheral surface of a round bar-shaped core material. The core material is formed by forming a weld overlay portion of the hard metal over the entire circumference and forming a weld overlay portion corresponding to the base material for forming the bearing body on the outer peripheral side thereof. The sliding portion is formed by the weld overlay of the hard metal exposed by penetrating, and the outer shape of the weld overlay of the base metal is processed into a predetermined shape to form the bearing body. Sliding bearing characterized by