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Plain bearing

A technology for sliding bearings and bearing surfaces, applied in sliding contact bearings, bearings, bearings for rotating motion, etc., can solve the problems of reducing rotating torque, achieve reduced rotating torque and wear, suppress wear, and have excellent lubricity Effect

Inactive Publication Date: 2020-11-10
NTN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a limit to the reduction of torque only by improving the bearing material, so attempts have been made to reduce the rotational torque by designing the shape of the bearing surface.

Method used

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  • Plain bearing
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1、 comparative example 1～ comparative example 3

[0068] Example 1, Comparative Example 1 to Comparative Example 3 [partial cylindrical shape (U-shaped)]

[0069] Table 1 shows the resin compositions used in the production of the sliding bearings of Examples and Comparative Examples. Using the resin compositions in Table 1, each of the resins in Example 1 was produced by injection molding. figure 1 Sliding bearings of the shape shown, Comparative Example 1 and Comparative Example 2 Figure 7 For plain bearings of the shape shown, Comparative Example 3 Figure 8 Plain bearings of the shape shown. here, Figure 7 In the sliding bearing 21 shown, the bearing surface 23 of the bearing main body 22 is an arc surface (no groove) along the outer peripheral surface of the rotating shaft, and the inner diameter of the bearing (the distance between the inner wall surfaces of the bearing main body) is 8.1mm. The bearing width (the axial dimension of the bearing main body) is 6 mm. Figure 8 In the shown sliding bearing 31 , the bea...

Embodiment 2、 comparative example 4、 comparative example 5

[0074] Example 2, Comparative Example 4, Comparative Example 5 [cylindrical type]

[0075] Example 2 was produced by injection molding using the following resin composition Figure 4 A sliding bearing of the shape shown: 20% by weight of lithium phosphate, 25% by weight of PTFE resin, 5% by weight of graphite and aramid fiber, and 3% by weight of carbon black were blended in PPS resin. Using the same resin composition as in Example 2, each of Comparative Example 4 was produced by injection molding. Figure 13 In the plain bearing of the shape shown in (a), in Comparative Example 5 Figure 13 A sliding bearing of the shape shown in (b). here, Figure 13 In the sliding bearing 41 shown in (a), the bearing surface 43 of the bearing main body 42 is a cylindrical surface (no groove) along the outer peripheral surface of the rotating shaft, the inner diameter of the bearing is 20 mm, and the bearing width is 6 mm. Figure 13 In the sliding bearing 51 shown in (b), the bearing su...

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PUM

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Abstract

Provided is a low-wear and low-torque slide bearing that is provided with a bearing surface which comes into contact with the outer peripheral surface of a rotating shaft, the slide bearing being capable of reducing frictional wear between a bearing surface and a rotating shaft and discharging wear debris produced by initial wear from a sliding surface, and having an exceptional capability to be supplied with and to retain grease. A slide bearing 1 is provided with a bearing surface 3 that comes into contact with the outer peripheral surface of a rotating shaft 4, the bearing surface 3 bears an eccentric load in a direction not perpendicular to the axis line of the rotating shaft 4, the bearing surface 3 is a cylindrical surface or partially cylindrical surface extending along the outer peripheral surface of the rotating shaft 4, and the portion of the bearing surface 3 that slides against the rotating shaft 4 and bears the load has a groove 5 extending along the axial direction of therotating shaft 4.

Description

technical field [0001] The invention relates to plain bearings. In particular, it relates to a sliding bearing suitable for supporting rotation shafts of rollers such as a fixing roller and a pressure roller in a fixing unit of an image forming apparatus such as a copier, a multifunction machine, a printer (laser printer, LED printer, etc.), a facsimile machine, etc. . Background technique [0002] A fixing device of an image forming apparatus such as a copier or a printer is a device that uses heat and pressure to fix unfixed toner transferred from a photosensitive drum to paper. In general, the fixing device applies heat and pressure simultaneously by allowing the paper to enter between a fixing roller with a heat source such as a halogen heater or a ceramic heater built in a cylinder and a pressure roller disposed opposite to it. Mechanism for toner fixing. One of the outer peripheral surfaces of the fixing roller and the pressure roller is made of an elastic body such...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16C33/20F16C13/02F16C17/02F16C33/10G03G15/00G03G15/20
Inventor 广濑和夫
Owner NTN CORP