JP2002295471A - Compound slide bearing and guide roller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable free design, provide a smooth slide characteristic, and prevent the occurrence of abnormal wear. SOLUTION: Either of an inside diameter part and an outside diameter part of a bearing is made of a sintered metal, the other of them is made of a synthetic resin, and the inside diameter part and the outside diameter part are mutually integrated by fitting them mutually.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a composite slide bearing and a guide roller.

[0002]

2. Description of the Related Art A bearing is a mechanical element that supports a rotating shaft and receives the load acting on the shaft to smoothly rotate the shaft. The bearings used in the high surface pressure part include (1) rolling bearings, (2) double-layer sliding bearings in which a synthetic resin is impregnated in a sintered metal back metal, and (3) a synthetic resin sheet is attached to the back metal. In addition, multi-layer slide bearings, (4) sintered metal slide bearings and the like are frequently used. On the other hand, there is a guide roller as a guide member for traveling on the belt, and as a guide roller used for the high surface pressure portion, there are a roller bearing and a sintered metal sliding bearing.

[0003]

However, the bearing or guide roller used in the high surface pressure portion has the following problems. (1) Rolling bearings have a size standard, and there are many design restrictions at peripheral parts. Also,
When the double-layer sliding bearings (2) and (3) are used by being fitted to a support shaft, the wrapped portion may attack a mating material, and the wrapped portion may not provide smooth slidability. There is also. Further, in the case of (4) the sliding bearing made of a sintered metal, sliding or rolling may not be performed smoothly depending on a mating member and abnormal wear may be caused. The present invention has been made to address such a problem, and an object of the present invention is to provide a composite sliding bearing and a guide roller that can be freely designed, have smooth sliding characteristics, and do not cause abnormal wear. And

[0004]

According to the present invention, there is provided a composite sliding bearing in which one of an inner diameter portion and an outer diameter portion is made of a sintered metal and the other is made of a synthetic resin. Are integrated by fitting. Further, the composite slide bearing is characterized in that the inner diameter portion is slidable with the support shaft, and the outer diameter portion is rollable with respect to the mating member.

In the guide roller of the present invention, one of the inner diameter portion and the outer diameter portion is a sintered metal and the other is a guide roller made of a synthetic resin, and the inner diameter portion and the outer diameter portion are fitted to each other. It is characterized by being integrated.

[0006] By using one of the inner diameter part and the outer diameter part as a composite sliding bearing made of a sintered metal and the other as a synthetic resin, a bearing having free dimensions can be obtained without design restrictions. Further, since no groove (wound portion) is formed on the sliding surface or the rolling surface, a smooth movement is performed. By adopting the above-described configuration of the guide roller, a guide roller of any size can be obtained, smooth movement can be realized, and since the friction coefficient between the sliding portion and the rolling portion is different, sliding or rolling with the mating member is possible. Movement is smooth and no abnormal wear occurs.

[0007]

FIG. 1 shows an example of a composite sliding bearing according to the present invention. FIG. 1 is a perspective view of a composite sliding bearing that can be used as a guide roller. The composite plain bearing 1 is in sliding contact with a cylindrical shaft 4 so as to be rotatable. When used as a guide roller, flanges may be provided at both ends of the composite plain bearing 1. In the composite slide bearing 1, the inner diameter portion 2 is formed of a synthetic resin, the outer diameter portion 3 is formed of a sintered metal, and the outer diameter portion is integrally fixed to the outer circumference of the inner diameter portion by fitting. In some applications, the inner diameter part 2 can be made of sintered metal and the outer diameter part 3 can be made of synthetic resin. The integration by fitting is obtained by press-fitting the inner diameter portion 2 and the outer diameter portion 3 with each other. A preferred embodiment of the composite sliding bearing 1 is that the inner diameter part 2 is made of synthetic resin and the outer diameter part 3 is made of sintered metal. With this combination, it is possible to prevent a decrease in slidability between the inner diameter portion and the support shaft, and prevent a reduction in wear of the outer diameter portion of the bearing.

The sintered metals usable in the present invention include stainless sintered metals, iron sintered metals, copper based sintered metals such as bronze, brass and nickel silver, aluminum based sintered metals, titanium based sintered metals, A cemented carbide based sintered metal can be used. Of these, relatively soft copper-based sintered metals such as bronze, brass and nickel silver, and aluminum-based sintered metals are preferable because they have the least aggressiveness to the counterpart material.

The slidability of the sintered metal can be improved by impregnating the fine pores with a lubricating substance such as lubricating oil.

The synthetic resin that can be used in the present invention is not particularly limited, and is generally a polytetrafluoroethylene resin, a polyacetal resin, a polyamide resin, a polyphenylene sulfide resin, a phenol resin, an aromatic polyether ketone resin. , A polyimide resin, a polyethylene resin, a liquid crystalline polyester resin, and the like.
Further, a polymer alloy using two or more of these synthetic resins may be used. Further, these synthetic resins may be a resin composition containing various solid lubricants and reinforcing materials.

Examples of the solid lubricant include fluorine resin powder such as polytetrafluoroethylene resin, graphite, molybdenum disulfide and the like. As the reinforcing material, for example, as a fibrous reinforcing material, carbon fiber, glass fiber, graphite fiber,
Metal fiber such as stainless steel fiber, calcium silicate whisker, calcium carbonate whisker, calcium sulfate whisker, magnesium sulfate whisker, magnesium nitrate whisker, magnesia fiber, aluminum borate whisker,
Examples include alumina fibers, titanium oxide whiskers, zinc oxide whiskers, silicon carbide fibers, silicon nitride fibers, potassium titanate whiskers, tyranno fibers, zirconia fibers, zonolite fibers, and wollastonite whiskers.

In the above synthetic resin, calcium carbonate, mica, silica, talc,
One or more powdered fillers such as calcium sulfate, kaolin, clay, glass beads, glass powder and the like can be mixed and used. Furthermore, various additives that can be added include a release agent, a lubricant, a heat stabilizer, an antioxidant, an ultraviolet absorber, a crystal nucleating agent, a foaming agent, a rust inhibitor, an ion trapping agent, a flame retardant, and a flame retardant. Examples include one or more auxiliary agents, coloring agents such as dyes and pigments, and antistatic agents. The above-mentioned solid lubricants, reinforcing materials, and the like can be used not only alone but also in a mixture of a plurality of types.

The amount of the synthetic resin composition can be varied depending on the use of the composite sliding bearing or guide roller. For example, the solid lubricant is 5 to 40% by weight, and the reinforcing material is 1 to 40% by weight. It is preferable to mix them.

[0014]

Example 1 The outer diameter portion was made of an oil-impregnated sintered metal (containing 20% by volume of bronze-turbine oil No. 2) and the inner diameter portion was made of a polyacetal resin composition (carbon fiber and polytetrafluoroethylene resin powder, respectively).
10% by weight) to produce a concentric cylindrical composite sliding bearing shown in FIG. The outer diameter part was integrated with the outer periphery of the inner diameter part by fitting. In this composite slide bearing, an outer diameter portion is applied to a guide rail made of cast iron, and the outer diameter portion rolls with respect to the guide rail. A support shaft made of stainless steel is fitted into the inner diameter portion, and the inner diameter portion and the support shaft slide by rolling the outer diameter portion. The obtained composite slide bearing is pressed against the guide rail at 13 kgf, and the guide rail is
An endurance test was performed by operating 100,000 strokes at 2 sec / stroke. After the durability test, the guide rail, the support shaft, and the composite sliding bearing were observed, and the presence or absence of wear was visually inspected.
Table 1 shows the results.

Comparative Example 1 Without using a polyacetal resin composition for the inner diameter part,
Oil-impregnated sintered metal (bronze-turbine oil No. 2 2)
0% by volume) to produce a concentric cylindrical sliding bearing shown in FIG. FIG. 2 is a perspective view of the sliding bearing 5 made of a single material. The obtained slide bearing was subjected to the same durability test as in Example 1. After the durability test, the guide rail, the support shaft, and the slide bearing were observed, and the presence or absence of wear was visually examined. Table 1 shows the results.

Comparative Example 2 A polyacetal resin composition (carbon fiber and polytetrafluoroethylene resin powder were mixed at 10% by weight each) without using an oil-impregnated sintered metal in the outer diameter portion.
Thus, a concentric cylindrical sliding bearing shown in FIG. 2 was produced. The obtained slide bearing was subjected to the same durability test as in Example 1. After the durability test, the guide rail, the support shaft, and the slide bearing were observed, and the presence or absence of wear was visually examined. Table 1 shows the results.

[0017]

[Table 1]

As a result of the durability test, in Example 1, no abrasion was observed in each sliding portion. In Comparative Example 1 in which the whole was formed of a sintered oil-impregnated bearing, wear was recognized on the guide rail and the outer diameter of the bearing. This is presumably because slippage between the guide rail and the outer diameter portion occurred due to reduced slidability between the inner diameter portion and the support shaft. In Comparative Example 2 in which the whole was formed of a synthetic resin bearing, wear was recognized in the outer diameter portion of the bearing. It is considered an attack by the guide roller material.

[0019]

According to the composite sliding bearing or the guide roller of the present invention, one of the inner diameter portion and the outer diameter portion is made of a sintered metal and the other is made of a synthetic resin, and is integrated by fitting each other. Therefore, free design is possible, and there is no need to design restrictions on peripheral parts. In addition, smooth slidability is obtained because there is no winding portion. In particular, when used as a guide roller, sliding or rolling is performed smoothly and abnormal wear does not occur.

[Brief description of the drawings]

FIG. 1 is a perspective view of a composite plain bearing.

FIG. 2 is a perspective view of a sliding bearing made of a single material.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Composite sliding bearing 2 Inner diameter part 3 Outer diameter part 4 Shaft 5 Single-part sliding bearing

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3J011 DA01 JA02 KA02 LA01 MA02 PA02 RA03 SB04 SC02 SC03 SC12 SC16 3J103 AA13 DA01 EA05 FA23 GA02 GA32 HA17 HA41

Claims (3)

[Claims] 1. A composite sliding bearing in which one of an inner diameter portion and an outer diameter portion of a bearing is a sintered metal and the other is a synthetic resin, wherein the inner diameter portion and the outer diameter portion are integrated by fitting. A composite sliding bearing characterized by being made into a composite. 2. The method according to claim 1, wherein the inner diameter portion is slidable with a support shaft.
The composite sliding bearing according to claim 1, wherein the outer diameter portion is rollable with respect to a mating member. 3. The guide roller according to claim 1, wherein one of an inner diameter portion and an outer diameter portion is a sintered metal, and the other is a guide roller made of a synthetic resin, wherein the inner diameter portion and the outer diameter portion are integrated by fitting. A guide roller characterized in that it is formed.