CN1945039A

CN1945039A - Rolling bearing

Info

Publication number: CN1945039A
Application number: CNA2006101540892A
Authority: CN
Inventors: 本多正明
Original assignee: NTN Corp
Current assignee: NTN Corp
Priority date: 2005-10-07
Filing date: 2006-09-22
Publication date: 2007-04-11
Anticipated expiration: 2026-09-22
Also published as: JP2007127267A; CN1945039B

Abstract

The present invention provides a rolling bearing for supporting an electric rotating component and tabling the axes of the rotating component into one track circle of internal and external circles in clearance fit way. The rolling bearing can prevent the generation of abnormal noise caused by the creep, and do not need other earthing mechanisms. The generation of abnormal noise caused by the gliding among the metals of the tabling part causing the creep can be prevented by forming graphite cover film (6a) or PTFE-Ni compound cover film(6b) with conductivity and low friction sliding characteristic on the inner diameter surface of the inside circle of the axes of the electric rotating component tabled in clearance fit way, and the axes of the rotating component can connect with the inside circle by the tabling part, and the other earthing mechanisms are not used.

Description

Rolling bearing

Technical field

The present invention relates to a kind of rolling bearing, particularly relate to being adapted to rotate and support charged rotating member freely, and the axial region of this rotating member is entrenched in rolling bearing on a side the track circle of Internal and external cycle in the mode of Spielpassung.

Background technique

Being assembled in the rotating members such as fixing roll in the office equipment such as duplicating machine or printer, for the reason of assembling performance, is on a side the track circle of mode with the Spielpassung Internal and external cycle that its axial region is entrenched in rolling bearing mostly.Therefore, according to different service conditions, between axial region chimeric and track circle, might produce creep, in order to prevent the wearing and tearing of the embedding part that this creep causes in the mode of Spielpassung, has the rolling bearing (for example, with reference to patent documentation 1) that on the embedding part of track circle, has formed patina.The bearing that patent documentation 1 is put down in writing is under the situation of the rolling bearing of a fixing roll that is being applied to afford thermal cycle, and patina also has and prevents to cause the effect of getting rusty because of dewfall.

On the other hand, utilize heat and pressure with the duplicating machine or the fixing roll of printer of fixing toner on printing in, have metallic material formation hollows such as the steel of utilization or aluminium, the fixing roll that heats from the inboard by electromagnetic induction heating.Such fixing roll makes the roller strap electricity based on the internal current that electromagnetic induction produced, so need make roller ground connection, to discharge charged particles, is to make roller ground connection by the bearing that supports axial region in the past.

[patent documentation 1] spy opens 2001-140901 communique (second figure)

The embedding part at the track circle that patent documentation 1 is put down in writing has formed the rolling bearing of patina, though can prevent the wearing and tearing of embedding part, if but be used to support charged rotating member as above-mentioned fixing roll, then because patina does not have electric conductivity, can not make rotating member ground connection by bearing so exist, and need to adopt the problem of other earthing mechanisms.

In addition, in the embedding part of the Spielpassung that produces creep, not only produce wearing and tearing, but also produce the metal abnormal sound that slip caused each other, patina can not be brought into play sufficient inhibition effect to the generation of this abnormal sound.In order to prevent the metal abnormal sound that slip produced each other, can consider on embedding part to form the lubricated tunicle of fluororesin etc., or utilize molybdenum disulfide etc. that embedding part is carried out solid lubrication, but because these do not have electric conductivity, so, same with the situation that forms patina, needs adopt other earthing mechanism.

Summary of the invention

The objective of the invention is to, at the charged rotating member of supporting, and the axial region of this rotating member is entrenched in the mode of Spielpassung in the rolling bearing on a side the track circle of Internal and external cycle, prevents the generation of the abnormal sound that creep causes, and do not need other earthing mechanisms.

In order to solve the above problems, the present invention supports charged rotating member freely in rotation, and the axial region of this rotating member is embedded in the mode of Spielpassung in the rolling bearing of outer diametric plane of the aperture surface of inner ring or outer ring, adopted at least on outer diametric plane, be formed with the structure of tunicle with electric conductivity and low friction slip with the aperture surface of the inner ring of the axial region of the chimeric described rotating member of mode of Spielpassung or outer ring.

Promptly, by on outer diametric plane with the aperture surface of the inner ring of the axial region of the chimeric rotating member of mode of Spielpassung or outer ring, formation has the tunicle of electric conductivity and low friction slip, can prevent to produce the metal abnormal sound that slip produced each other of the embedding part of creep, and can make the axial region and the conducting of track circle of rotating member by embedding part, and not need other earthing mechanisms.

Described tunicle with electric conductivity and low friction slip can adopt the graphite tunicle.

Described tunicle with electric conductivity and low friction slip also can adopt the compound tunicle that is combined with metal powder in fluororesin.

The thickness of described tunicle is for wishing 1～10 μ m, preferred 2～10 μ m.This is for following reason: if by film thickness less than 1 μ m, then can not prevent the metal slip each other of embedding part fully, if surpass 10 μ m, then the chimeric precision with axial region reduces, and has increased the cost that forms tunicle.

The thickness of described tunicle that is attached to the plane of trajectory orbital of described inner ring or outer ring is wished below 10 μ m, below the preferred 5 μ m.This is for following reason: though do not wish to adhere to described tunicle on plane of trajectory orbital, do not carry out the tunicle processing if do not shield plane of trajectory orbital in order to simplify operation, then also can adhere to tunicle on plane of trajectory orbital.If what be attached to this plane of trajectory orbital is surpassed 10 μ m by film thickness, then can peel off because of the rotation tunicle of rotor, this tunicle of peeling off embeds rotor as foreign matter, can shorten the life-span of axle thus.

Each above-mentioned rolling bearing is applicable to that described rotating member is the situation with the fixing roll of fixing toner on printing.

Rolling bearing of the present invention is because on the outer diametric plane with the aperture surface of the inner ring of the axial region of the chimeric rotating member of mode of Spielpassung or outer ring, be formed with tunicle with electric conductivity and low friction slip, so can prevent to produce the metal abnormal sound that slip produced each other of the embedding part of creep, and can make the axial region and the conducting of track circle of rotating member by embedding part, and not need other earthing mechanisms.

Description of drawings

Fig. 1 a is the longitudinal section of the mode of execution of expression rolling bearing, and b is the sectional view of wanting portion that amplifies expression a;

Fig. 2 is the longitudinal section of fixing roll of the duplicating machine of the expression rolling bearing that used Fig. 1;

Fig. 3 be on the plane of trajectory orbital of inner ring of each test specimen in the expression bearing life test by the plotted curve of thickness and L10 life relation.

Among the figure: 1-deep trouth ball bearing; The 2-inner ring; The 3-outer ring; The 4-ball; The 5-retainer; 6a, 6b-tunicle; The 11-fixing roll; The 11a-axial region; The 12-electromagnetic induction heater; The 13-framework.

Embodiment

Below, in conjunction with the accompanying drawings, embodiments of the present invention are described.This rolling bearing is shown in Fig. 1 (a) and (b), be ball 4 to be remained on deep trouth ball bearing 1 between inner ring 2 and the outer ring 3 by retainer 5, with the mode of Spielpassung chimeric the aperture surface of inner ring 2 of axial region of charged rotating member, be formed with graphite tunicle 6a or in polytetrafluoroethylene (PTFE), cooperated the compound tunicle 6b of PTFE-Ni of metal Ni powder as fluororesin with electric conductivity and low friction slip.

Fig. 2 represents to be supported with by above-mentioned deep trouth ball bearing 1 fixing roll 11 of the duplicating machine of axial region 11a.This fixing roll 11 adopts aluminium to form hollow, and utilizes the electromagnetic induction heater 12 that is arranged on hollow portion to heat, and is charged by the internal current that produces based on electromagnetic induction.The axial region 11a at fixing roll 11 two ends is entrenched in the aperture surface of inner ring 2 in the mode of Spielpassung, and outer ring 3 is fixed on the framework 13 of duplicating machine, and each axial region 11a is connected also ground connection by deep trouth ball bearing 1 with framework 13, discharges the charged particles of fixing roll 11 thus.

[embodiment 1]

As embodiment, deep trouth ball bearing that on the aperture surface of inner ring, has formed the graphite tunicle shown in Figure 1 and the deep trouth ball bearing that has formed the compound tunicle of PTFE-Ni have been prepared.As a comparative example, prepared on the aperture surface of inner ring, not form the deep trouth ball bearing of tunicle and the deep trouth ball bearing that formed the deep trouth ball bearing of patina and formed the PTFE tunicle.In addition, the thickness of each tunicle is changed in the scope of 2～10 μ m.

The inner ring of the deep trouth ball bearing of these each embodiments and comparative example is embedded in the axial region of aluminum rotating member in the mode of Spielpassung, make 1000 hours test of rotating member rotation, check to have or not the energising performance that produces between abnormal sound and axial region and the bearing.Test conditions and power on condition are as follows.

(test conditions)

Bearing size: internal diameter 25mm, external diameter 37mm, width 7mm

Axial region temperature: 200 ℃

Bearing load: 220N (radial load)

Rotational speed: 130rpm

(power on condition)

Electrified voltage: 30V

Controlling resistance: 300k Ω (being connected in parallel) with the energising determination part

Sample interval: 1 μ s

[table 1]

Ball bearing	The tunicle of inner ring aperture surface	By film thickness (μ m)	Have or not abnormal sound	The energising performance
Ball bearing	The tunicle of inner ring aperture surface	By film thickness (μ m)	Have or not abnormal sound	The energising performance	Embodiment	The graphite tunicle	10	Do not have	Very
5	Produce after 1000 hours	Very					10	Do not have	Very
5	Produce after 1000 hours	Very	3	Produce after 500 hours			Very
2	Produce after 500 hours	Very	3	Produce after 500 hours			Very
2	Produce after 500 hours	Very	The compound tunicle of PTFE-Ni	10			Do not have	Very
5	Produce after 1000 hours	Very		10			Do not have	Very
5	Produce after 1000 hours	Very		3		Produce after 500 hours	Very
2	Produce after 500 hours	Very		3		Produce after 500 hours	Very
2	Produce after 500 hours	Very		Comparative example		Do not have	-	Produce after 8 hours	Very
Patina	3	Produce after 100 hours	Bad			Do not have	-	Produce after 8 hours	Very
Patina	3	Produce after 100 hours	Bad		The PTFE tunicle	10	Do not have	Bad
5	Produce after 1000 hours	Bad				10	Do not have	Bad
5	Produce after 1000 hours	Bad	3			Produce after 500 hours	Bad

The above-mentioned check result that produces abnormal sound and energising performance that has or not of table 1 expression.In addition, in the inspection of energising performance, for during 1000 hours test period, the resistance between axial region and the bearing is maintained at the following sample of 200k Ω and is considered as switching on functional, is considered as bad for resistance as long as once surpassed the sample of 200k Ω.At first, for the generation that has or not abnormal sound, confirm to form each embodiment's the sample of graphite tunicle and the compound tunicle of PTFE-Ni and the sample that has formed the comparative example of PTFE tunicle and all obtained good result, and all be to be under the situation of 10 μ m by film thickness, do not produce abnormal sound fully,, after 1000 hours, produce abnormal sound being under the situation of 5 μ m by film thickness, being under the situation of 3 μ m and 2 μ m by film thickness, after 500 hours, produce abnormal sound.Relative therewith, the sample of comparative example that does not have tunicle is after 8 hours, and the sample of comparative example that has formed patina has all produced abnormal sound after 100 hours.

Secondly, for the energising performance, embodiment's sample and the thickness of tunicle have nothing to do, and all can stably obtain good energising performance, and it is all bad to have formed the energising performance of sample of comparative example of patina and PTFE tunicle.In addition, there is not the energising performance of sample of comparative example of tunicle good certainly.Go out according to above results verification, embedding part in Spielpassung, be the sample that has formed the embodiment of graphite tunicle or the compound tunicle of PTFE-Ni on the aperture surface of inner ring, can prevent the generation of the abnormal sound that creep causes, and need not other earthing mechanism can support charged rotating member.

[embodiment 2]

For the deep trouth ball bearing that on the aperture surface of above-mentioned inner ring, has formed the graphite tunicle, the plane of trajectory orbital ground that does not shield inner ring carries out tunicle to be handled, then, to also having adhered to the bearing of tunicle on the plane of trajectory orbital, under the condition identical, carried out the bearing life test with above-mentioned test conditions.Make in the scope of 0～15 μ m, being changed of plane of trajectory orbital, and each is by the test specimen of film thickness to have adopted ten respectively by film thickness.

Fig. 3 represents that in the test of above-mentioned bearing life each is by the L10 life-span of the test specimen of film thickness (90% unabroken pot life of sample).Do not have the sample of tunicle to have on the plane of trajectory orbital and surpass 1000 hours L10 life-span, the life-span that by film thickness is the sample of 2 μ m is 950 hours, the life-span that by film thickness is the sample of 5 μ m is 900 hours, the life-span that by film thickness is the sample of 10 μ m is 500 hours, the life-span that by film thickness is the sample of 15 μ m is 300 hours, along with by the increase of film thickness, the L10 lost of life.Can see according to this bearing life test result, in tunicle is handled, omit under the situation of shielding, allow attached to the thickness of the tunicle on the plane of trajectory orbital and wish below 10 μ m, below the preferred 5 μ m.

In the above-described embodiment, for example understand the deep trouth ball bearing that the axial region of charged rotating member is entrenched in the aperture surface of inner ring, but rolling bearing of the present invention also is applicable to the bearing that axial region is entrenched in the outer diametric plane of outer ring, nor is limited to the deep trouth ball bearing.

In addition, rolling bearing of the present invention also can be used to support because of charged fixing roll rotating members in addition such as static.

Claims

1. rolling bearing, between the plane of trajectory orbital of inner ring and outer ring, be arranged with a plurality of rotors, and charged rotating member is supported in rotation freely, the axial region of this rotating member is embedded in the aperture surface of described inner ring or the outer diametric plane of described outer ring in the mode of Spielpassung, this rolling bearing is characterised in that

At least on outer diametric plane, be formed with tunicle with electric conductivity and low friction slip with the aperture surface of the inner ring of the axial region of the chimeric described rotating member of mode of Spielpassung or outer ring.

2. rolling bearing according to claim 1 is characterized in that,

Described tunicle with electric conductivity and low friction slip is the graphite tunicle.

3. rolling bearing according to claim 1 is characterized in that,

Described tunicle with electric conductivity and low friction slip is the compound tunicle that is combined with metal powder in fluororesin.

4. according to each described rolling bearing in the claim 1～3, it is characterized in that,

The thickness of described tunicle is 1～10 μ m.

5. rolling bearing according to claim 4 is characterized in that,

The thickness of described tunicle of plane of trajectory orbital that is attached to described inner ring or outer ring is below 10 μ m.

6. according to each described rolling bearing in the claim 1～5, it is characterized in that,

Described rotating member is with the fixing roll of fixing toner on printing.