JPH0227525B2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Field of Industrial Application This invention relates to a method for manufacturing a bearing in which a synthetic resin sliding surface is attached to a metal outer cylinder, and the bearing has excellent dimensional accuracy, durability, and heat dissipation. The present invention relates to a method for manufacturing a bearing with improved performance through a simple process.

(b) Conventional technology The use of synthetic resin materials as the sliding surface material of bearings has a self-lubricating property compared to metal sliding surface materials, resulting in a lower coefficient of friction and higher sliding absorption ability. It is widely used because it does not generate noise, has excellent corrosion resistance, chemical resistance, electrical insulation, etc., and is easy to process and low cost. Dimensional changes cannot be ignored due to low heat resistance and high coefficient of thermal expansion, and some materials may absorb moisture and swell in high humidity atmospheres, which can cause dimensional changes as well.Additionally, consider the possibility of shaft clinging, etc. In this case, it becomes necessary to increase the design value of the clearance with the shaft, which inevitably leads to a decrease in accuracy. Furthermore, the load resistance also decreases, including creep deformation due to the above-mentioned expansion and contraction.

In order to compensate for these drawbacks of synthetic resin bearings, a synthetic resin bearing is reinforced by lining it with a metal outer cylindrical member, such as the invention described in US Pat. No. 3,552,815.

However, in all conventional bearings, the metal outer cylinder is obtained by machining, die-casting, etc., and has a relatively thick standard shape from the beginning, and a synthetic resin sliding member is inserted and attached to the inner surface of the metal outer cylinder. However, as will be explained later, there were many drawbacks.

(c) Problems to be solved by the invention As mentioned above, in conventional bearings, the outer cylinder is mainly made of cast metal, so not only is it not easy to attach a resin sliding surface, but it is also difficult to attach the resin sliding surface, especially when the bearing is small. The manufacturing operation is difficult, and furthermore, the dissipation of frictional heat is incomplete, and there is a risk that the sliding member will fall off in the axial direction, or a gap will be created between the outer cylinder and the sliding member, causing wear and tear. There were drawbacks such as the accumulation of powder, etc., which accelerated wear.

The present invention was made with the aim of solving the above-mentioned drawbacks of conventional bearings, significantly improving dimensional accuracy, durability, etc., and providing a method for manufacturing bearings that has an extremely simple process. This is the completed version.

(d) Means for Solving the Problems Hereinafter, technical measures taken in the method of manufacturing a bearing according to the present invention will be specifically explained based on the embodiment shown in the drawings.

FIG. 1 shows a perspective view of a completed bearing manufactured by the bearing manufacturing method according to the present invention, in which 1 is a metal substrate, which has a cylindrical shape, and inside thereof, each independently has an arbitrary shape. Synthetic resin sliding face plate 2,
Grooves 3 and 4 having a desired angle with respect to the axial direction are formed in the middle with a gap between them, and the metal surfaces are arranged and fixed in the grooves 3 and 4 so as to be exposed inside. be.

2 and 3 show the manufacturing process of the bearing manufacturing method according to the present invention, in which a large number of through holes 5 are bored in a band-shaped metal substrate 1, and a plurality of independent synthetic resin sliding holes are formed in each band-shaped metal substrate 1. A part of the face plate 2 is fixed to the metal substrate by integral molding, welding, gluing, etc. so as to integrally fill or fit into the through hole 5, and then the resin sliding surface is fixed to the inside. It is characterized in that it is made into a cylindrical shape by winding processing etc. so that it becomes a bearing.

That is, according to the manufacturing method according to the present invention, the bearing is completed by rolling after the sliding surfaces have been processed and fixed securely and completely in advance, so that individual independent sliding members can be attached to the cylindrical part. Not only does it eliminate the extremely difficult and complicated process and work of inserting it, making it simple and low cost, but it also improves dimensional accuracy, or allows the axial direction and angle of the grooves 3 and 4 to be adjusted, which was previously difficult. Even if you have one, you can easily install it.

Furthermore, the bearing manufactured by the manufacturing method according to the present invention has many advantages, unlike conventional products, as follows.

That is, since the plurality of sliding face plates 2 are each independently and integrally fixed to the metal substrate 1, they are not susceptible to expansion, contraction, or moisture absorption due to frictional heat or environmental temperature.
Volume changes such as expansion and contraction due to drying etc. are absorbed by the grooves 3 and 4 which are disconnected from the sliding face plate and have a desired direction, significantly improving dimensional accuracy, and as a result, the bearing does not cling to the shaft. By preventing such problems, the design value of the clearance with the shaft can be reduced, and the precision of the bearing can be improved.

In addition, the exposed grooves 3 and 4 of the metal substrate around the sliding face plate act as cooling grooves, and the heat generated by friction etc. is directly dissipated to the outside through the metal surface with a large heat transfer coefficient. Conditions are relaxed and bearing durability is significantly improved.

That is, the metal substrate in the bearing manufactured by the manufacturing method according to the present invention not only maintains the shape and dimensions of the bearing and maintains load resistance, but also functions as a heat sink.

In addition, bearing wear is greatly accelerated by abrasion particles entering the sliding surface.
In the bearing according to the present invention, wear powder is discharged through the groove around the sliding face plate, so that it does not enter the sliding face, and the wear resistance of the bearing is significantly improved.

Furthermore, according to this manufacturing method, by changing the shape and size of the sliding face plate, the grooves 3 and 4 can be designed not only in one direction but also in any direction, thereby improving heat dissipation, wear resistance, It is possible to have a structure that takes lubrication etc. into consideration as appropriate.

Furthermore, in conventional bearings, it was difficult to process grooves such as oil grooves on the sliding surface of the bearing, but according to the manufacturing method of the present invention, this can be done extremely easily as shown in the examples described later. I can do it.

(e) Examples Below, the bearing manufacturing method according to the present invention will be specifically explained by giving examples of implementation.

For example, a suitable pitch and diameter, such as φ1 to 8 mm, pitch 2 to
A metal substrate 1 having a through hole 5 of approximately 10 mm is mounted on an injection mold 6, 6' as shown in FIG. The independent sliding face plate 2 made of synthetic resin is integrally injection molded with a metal substrate so as to form grooves 3 and 4 with a gap between them to obtain the composite substrate shown in Fig. 2, which is then pressed. A cylindrical bearing shown in FIG. 3 is manufactured by bending using a mold or the like.

The synthetic resin material used in this case may be thermoplastic or thermosetting as long as it can be injection molded.

Surface processing such as oil grooves on the sliding surface can also be easily performed at the same time as the above molding by using an injection mold.

In this case, the resin for the sliding face plate may be a thermosetting resin such as phenolic resin, a thermoplastic resin such as polyphenylene sulfide (PPS), nylon, polyethylene, or any other synthetic resin material that can be injection molded. Well, either is fine.

(f) Effects of the invention As mentioned above, the method of manufacturing a synthetic resin sliding surface bearing according to the present invention not only makes it easier and lower cost to manufacture this type of bearing, which was conventionally complicated and difficult. By implementing this manufacturing method, it also contributes to improvements in dimensional accuracy, prevention of sticking to the shaft, dissipation of frictional heat, circulation of lubricant, discharge of friction powder, etc. when the completed bearing is used. It is something that can be done.

[Brief explanation of drawings]

FIG. 1 is a perspective view of an embodiment of a bearing manufactured by the bearing manufacturing method according to the present invention, FIGS. 2 and 3 show the manufacturing process of this manufacturing method, and FIG. FIG. 2b is a cross-sectional view of an embodiment of the composite substrate fixed to the substrate and before rolling processing. FIG. 3 is a longitudinal cross-sectional view after the rolling process, and FIG. 4 is a cross-sectional view of the sliding face plate fixed by outsert injection. FIG. 5 is an embodiment diagram in which the shape of the sliding face plate is changed. In the figure, 1...Metal substrate, 2...Synthetic resin sliding face plate, 3, 4...Groove, 5...Through hole (through hole), 6,
6'...Mold.

Claims (1)

[Scope of Claims] 1. A plurality of independent synthetic resin sliding face plates 2 are provided on one side of a band-shaped metal substrate 1 having a plurality of through holes.
are arranged so as to form a groove in the middle with a gap between them, are integrally fixed to a metal substrate, and are rolled into a cylindrical shape so that the resin surface faces inside. Law. 2. The method for manufacturing a bearing according to claim 1, characterized in that the synthetic resin sliding face plate 2 is integrally molded and fixed to the metal substrate 1 by injection molding.