JPS58131429A - Bearing material - Google Patents

Abstract

PURPOSE:To provide a bearing material which is excellent in lubrication and wear-resistance by impregnating a reinforcing agent with a mixture consisting of boron nitride, polyphenylene-sulfide, lead and/or lead oxide and polytetrafluoroethylene. CONSTITUTION:A reinforcing agent is a porous layer backed with a steel and formed of network, texile, fibrous materials of a metal, a synthetic resin, and carbon. The reinforcing agent is impregnated with 5-20vol% of boron nitride, 5-40vol% of polyphenylenesulfide, and polytetrafluoroethylene the rest vol% to obtain a desired bearing material. In this case, polyphenylenesulfide exists in the form of bonding with the network polyphenylenesulfide to be prevented from separation due to abrasion, so as to heighten load-resisting performance and wear-resistance by a large margin.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to bearing materials, particularly multilayer bearings whose main component is a polymeric resin material.

Bearing materials based on polytetrafluoroethylene, which is a polymeric resin material, have been proposed by various woodworkers in the past, and have shown excellent bearing properties in non-lubricated or oil-lubricated conditions, but they still have poor performance under these operating conditions. It wasn't satisfying. For example, a door roller bearing used without lubrication cannot exceed 100,000 cycles under the door roller standard durability conditions, i.e., running speed 300''/, reciprocating distance 1.7 degrees, 9 degrees Celsius, and a load aoKg.
Furthermore, even in an oil-lubricated state, when the surface pressure exceeds 600''/4, the bearing itself loses its self-lubricating properties and seizure may occur.

As a result of intensive research into bearing materials that can withstand such harsh conditions, the present inventor found that boron nitride, polyphenylene sulfide, lead and/or lead oxide, polytetrafluoroethylene (hereinafter P, T, Fl The present inventors discovered that a material consisting of (denoted as ) has excellent bearing properties and completed the present invention.

The present invention is characterized by boron nitride 5 to 20 volume Ti, polyphenylene sulfide 5 to 40 volume Ti, lead and/or lead oxide 5 to 20 volume Ti, P.

A bearing material is obtained by impregnating a reinforcing material with a mixture of T, F, and the remainder of E.

Here, the composition limit range of the present invention and the reason thereof will be shown.

Boron nitride: As shown in Figure 1, boron nitride is extremely stable because trivalent boron atoms and nitrogen atoms bond like B-N-B-N, and hexagonal lattices overlap in layers. It is a type of solid lubricant, and when it coexists with polyphenylene sulfide, it easily bonds at 300 to 400°C and becomes more stable. The amount of boron nitride added is 5 to 20 volumes based on the impregnating agent. If it is less than 5 volume squares, there will be no lubricating effect, and if it exceeds 20 volume squares, the mechanical strength of the bearing itself will be weakened, leading to increased wear and tear.

Lead, lead oxide: Lead, lead oxide is an excellent solid lubricant, and when dispersed in a matrix it synergistically improves its effectiveness with the lubricating properties of other materials. If it is less than 5 volume squares, it will not have this effect, and if it exceeds 20 volume squares, the material will be easily damaged.

Polyphenylene sulfide: Polyphenylene sulfide not only stabilizes the boron nitride by bonding with the boron nitride, but also forms a network in the main components P, T, F, and E, so that even if P, T, and Fl are worn out, it will not only stabilize the boron nitride. It has the effect of not allowing it to be easily separated. If the body volume is less than 5, this effect heat will be $<, and if the body volume increases by 40, then P.

This impairs the lubricating properties of T and Fl.

p, T, p, E: These are the main components, and P, T, F, and E themselves have excellent bearing properties.

Reinforcing material: Since the material having the above composition alone cannot be used as a bearing due to its weak mechanical strength, it must be impregnated with a reinforcing material before use. As the reinforcing material, a porous layer lined with steel, especially one made by sprinkling a bronze layer on steel and sintering it, is suitable, but other materials such as metals, synthetic resins, carbon, etc. can be used in the form of nets, fabrics, fibers, etc. A reinforcing material may be impregnated with the above-mentioned composition.

According to the findings of the present inventors, optimal results were obtained when a sintered layer of bronze backed by steel was impregnated with an impregnating agent having the following composition.

Boron nitride 7 volume Tipolyphenylene sulfide 15 volume Lead thioxide
10 volume attacks P, T, F, E
68 Volume ratio According to the present invention, a bearing material that is several times better in load-bearing performance and specific wear than conventional multilayer bearing materials can be obtained.
Polyphenylene sulfide exists in a network in F and E,
In addition, boron nitride exists in the form of a network-like polyphenylene sulfide bond, which prevents it from coming off due to wear. This is due to the synergistic effect of

Next, embodiments of the present invention will be described.

Example volume: 7 tbsp boron nitride, 10 tm lead oxide, 15 tlb1 polyphenylene sulfide, and P, T, F, E 68
A porous bronze layer lined with steel was impregnated with a mixture containing the following steps to obtain a multilayer bearing material.

First, add 3 to the aqueous disvergidine of P, T, F, and E particles.
Lead oxide powder of 50 min., polyphenylene sulfide powder of 350 min. or less, and boron nitride powder are mixed to have the above composition.

Then, this mixture is stirred in a laikai machine, and 14% by weight of alcohol is added to solidify the mixture. Excess liquid is removed and the slurry is applied to the surface of the porous bronze layer. This porous bronze layer was obtained by sintering bronze powder that passed through 100 mesh but not 200 mesh onto the steel strip. After applying the impregnating agent, baking is completed in a furnace maintained at 300 to 380°C. The obtained multilayer bearing material was further passed through smoothing rolls to make the thickness uniform, and was used as a bearing material.

Figures 2 and 3 show the results of looking at the amount of wear of the bearing material obtained by varying the friction speed and contact pressure. For reference, P, T, F.

The results obtained for conventional bearing materials mainly composed of E are shown in FIGS. 4 and 5. FIG. 6 shows the results obtained by conducting door roller standard tests on conventional bearing materials and the product of the present invention.

As is clear from these comparisons, the material of the present invention has excellent bearing properties.

[Brief explanation of the drawing]

Fig. 1 is a diagram explaining the crystal lattice of boron nitride, Fig. 2 is a graph showing the specific wear amount when the contact pressure is changed for the bearing material according to the present invention, and Fig. 3 is a graph showing the amount of specific wear when the contact pressure is changed. Figure 4 is a graph showing the specific wear amount when the contact pressure is changed for a conventional bearing material, and Figure 5 is the same (when the friction speed is changed for a conventional bearing material). FIG. 6 is a graph showing the relationship between conventional bearing materials and the product of the present invention, which were obtained by conducting standard tests for door rollers. 111th Friction speed (+++5ec) 3rd ml Friction speed 1m/'vx) 41st! I 11! Friction speed (?I+ formula) % formula%)

Claims (3)

[Claims] (1) Boron nitride 5 to 20 volumes, polyphenylene salsulfate 115 to 40 volumes, lead and/or lead oxide 5 to
A bearing material made by impregnating a reinforcing material with a mixture consisting of 20 vol. H and the remainder polytetrafluoroethylene. (2) The bearing material according to claim (1), wherein the reinforcing material is a porous layer lined with steel. (3) The reinforcing material is made of metal, synthetic resin, carbon, etc. in the form of a net, a fabric, or a fiber.