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Sliding bearing, bearing device, and image formation device

A sliding bearing and bearing device technology, applied in sliding contact bearings, rotating bearings, bearings, etc., can solve the problems of high cost and complex structure, and achieve the effects of excellent friction, elimination of uneven rotation, and fast cooling speed.

Active Publication Date: 2020-09-01
NTN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ball bearings can also be used for shafts with relatively heavy loads, and because of low friction and low heat generation, they have little influence on shaft heat generation, but the structure is complicated and expensive

Method used

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  • Sliding bearing, bearing device, and image formation device
  • Sliding bearing, bearing device, and image formation device
  • Sliding bearing, bearing device, and image formation device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0133] 80% by volume of ultra-high molecular weight PE resin powder (weight average molecular weight: 250,000 to 600,000) that can be injection molded as the base resin, 15% by volume of PTFE resin as an additive, and 5% by volume of Mohs hardness 3 Calcium carbonate whiskers of the following acicular inorganic fillers were blended, powder mixed and melt-kneaded to produce pellets, and friction and wear test pieces and test pieces for physical property measurement were molded by injection molding.

[0134]

[0135] The test was carried out using a radial type friction and wear tester. As the friction and wear test piece, a cylindrical friction and wear test piece of φ12×φ8×t10 mm was used. As the target shaft, two types of rotating shafts made of SUS303 and POM resin (no filler) were used. In a non-lubricated environment, the test conditions for the SUS shaft are surface pressure 0.7MPa, speed 0.15m / s, rotation time 30min, and test start temperature 28°C±1°C. It should be ...

Embodiment 2～ Embodiment 5

[0140] Each test piece was formed in the same manner as in Example 1 except that the same base resin as in Example 1 and the additives and inorganic fillers described in Table 1 were mixed in the compounding ratio in Table 1, and the same procedures as in Example 1 were carried out. test.

Embodiment 6

[0160] The resin composition of Example 1 was used for the sliding bearing. This sliding bearing was assembled to the housing member in which the heat dissipation groove of Comparative Example 7 was formed to form a bearing device.

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PUM

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Abstract

The present invention provides: a sliding bearing that has an exceptional low-friction property though containing no oil, and allows any increase in shaft temperature to be minimized even under continuous duty; and an image formation device comprising the sliding bearing. Sliding bearings 5a-5c rotatably support rotating shafts on cylindrical inside-diameter surfaces. The sliding bearings 5a-5c are compacts of an oil-free resin composition that contains no oil, the resin composition having an injection-moldable ultra-high molecular weight polyethylene resin as a base resin, and containing an ethylene tetrafluoride resin and an acicular inorganic filler having a Mohs hardness of 3 or less as additives. Relative to the total resin composition, the ultra-high molecular weight polyethylene resin content is 65 vol% or more, the ethylene tetrafluoride resin content is 5 to 25 vol%, and the acicular inorganic filler content is 1 to 20 vol%.

Description

technical field [0001] The present invention relates to sliding bearings, and more particularly to a developing section, a photosensitive section, a transfer section, a paper discharge section, and a paper supply section in image forming devices such as copiers, multifunction machines, printers (laser beam printers, inkjet printers, etc.), facsimile machines, etc. Sliding bearings used for supporting various rollers or shafts. In addition, the present invention relates to a bearing device and an image forming apparatus including the sliding bearing. Background technique [0002] Image forming apparatuses such as copiers and printers transfer toner to the photosensitive drum by a rotatable developing roller that develops an electrostatic latent image formed on a photosensitive drum and a supply roller that is arranged in contact with the developing roller and supplies toner. A device that transfers the electrostatic latent image on the drum, and then transfers the toner on t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16C33/20C08J5/16C08L23/06C08L27/18F16C17/02G03G15/00G03G15/08
CPCC08L23/06C08L27/18F16C17/02G03G15/00G03G15/08F16C33/201F16C17/243F16C2202/04F16C2208/02F16C2208/22F16C2208/78F16C2208/32F16C2324/16F16C35/02F16C37/00
Inventor 宗田法和广濑和夫
Owner NTN CORP