JP2003130068A - Insulating sleeve integrated bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an insulating sleeve integrated bearing having a high airtight property at a low cost. SOLUTION: An outward flange 7a is arranged at one end of an insulating sleeve 7 fit into a bore surface of an inner ring 2, and an annular projected portion 7b is formed on a face opposing to a side end face of the flange 7a, and one side end of a gap 4 is blocked by inserting the projected portion 7b into the gap 4 between the inner ring 2 and an outer ring 3. Thus, the airtight property is improved so as to obtain labyrinth seal effects between the projected portion 7b and outer ring 3, and a piece of shield plates installed into a conventional bearing becomes unnecessary.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling bearing with a heat insulating sleeve integrated with a heat insulating sleeve fitted on the inner diameter surface of an inner ring.

[0002]

2. Description of the Related Art An electrophotographic apparatus such as a copying machine or a laser beam printer is equipped with a fixing device for fixing toner onto copy paper. In this fixing device, a heat roller having a built-in heater is pressed against a pressure roller arranged in parallel to the heat roller. By heating the heat roller and rotating both rollers, the pressure is supplied between the rollers. The toner is heat-fused to the copy paper while feeding the copy paper.

The bearing for supporting the heat roller of such a fixing device stably supports the heat roller heated to a high temperature and enables high-speed rotation in response to the demand for high-speed fixing processing. In addition, a type in which a heat insulating sleeve is fitted on the inner diameter surface of the rolling bearing is often used.

FIG. 4 shows an example of the rolling bearing integrated with the heat insulating sleeve as described above. In this bearing, a plurality of balls 54 are accommodated in a gap 53 between an inner ring 51 and an outer ring 52, and a heat insulating sleeve 55 having an outward flange 55a at one end is fitted into an inner diameter surface of the inner ring 51.

The outer peripheral ends of a metal shield plate 56 are fitted in the seal grooves 52a provided on the inner diameter surfaces of both ends of the outer ring 52, and each of these shield plates 56 has an inner peripheral end. Place the inner ring 51 close to the outer diameter surface of the inner ring 51.
Both ends of the gap 53 between the outer ring 52 and the outer ring 52 are closed.

Further, the flange 5 of the heat insulating sleeve 55
5a is for abutting against one end face of the inner ring 51 during assembly to position the sleeve 55 in the axial direction with respect to the inner ring 51, and the outer diameter of the outer ring 52 is equal to the dimensional tolerance and the axial gap. The outer diameter of the inner ring 51 is approximately the same as the outer diameter of the inner ring 51 so that it does not come into contact with the shield plate 56 even if it is moved in the axial direction.

[0007]

In the above-described bearing integrated with a heat insulating sleeve, the flange of the heat insulating sleeve extends only up to the outer diameter surface of the inner ring, and only the shield plate prevents foreign matter from entering. Since there is a minute gap between the inner peripheral edge of the shield plate and the outer diameter of the inner ring in order to keep the rotating torque low, it cannot be said that the sealability is sufficient. In addition, if the inner peripheral edge of the shield plate is disengaged from the side edge of the inner ring due to the axial movement of the outer ring, there is a problem that the sealing performance is significantly reduced.

A rubber seal may be used in place of the shield plate. In that case, the sealing property is the same as that of the shield plate and, in addition, a fluororubber or the like is used so that it can be used under the high temperature conditions as described above. It is necessary to use expensive materials, which increases costs.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a heat-insulating sleeve-integrated bearing having high sealing performance and low cost.

[0010]

In order to solve the above-mentioned problems, the heat insulating sleeve-integrated bearing of the present invention has an inner ring, an outer ring, a plurality of rolling elements accommodated between the inner and outer rings, and an inner diameter of the inner ring. A heat insulating sleeve fitted to the surface, an outward flange is provided on at least one end of the heat insulating sleeve, and the surface of the flange facing the bearing side end surface is inserted into the gap between the inner ring and the outer ring. That is, the configuration is such that a convex portion that closes one end of this gap is formed.

That is, a convex portion is formed on the surface of the flange provided on at least one end of the heat insulating sleeve, the surface facing the bearing side end surface, and the convex portion is inserted into the gap between the inner ring and the outer ring to insert one end of the gap. By closing the above, the labyrinth sealing effect can be obtained between the convex portion and the outer ring to improve the sealing performance, and at least one shield plate is not required, and the number of parts is reduced.

The heat insulating sleeve may be formed of a resin having heat resistance.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIGS. 1 and 2 show a first embodiment. As shown in FIGS. 1A and 1B, the heat insulating sleeve-integrated bearing 1 accommodates a plurality of balls 5 as rolling elements in a gap 4 between an inner ring 2 and an outer ring 3 to retain a cage 6.
The heat-insulating sleeve 7 made of a heat-resistant resin having an outwardly facing flange 7a at one end is fitted to the inner diameter surface of the inner ring 2 through the heat-insulating sleeve 7 and a high-temperature rotating body (not shown). ) Is supported.
A retaining ring 8 for fixing the axial position of the bearing 1 to a fixing member (not shown) is fitted in an annular groove provided on the outer diameter surface of the outer ring 3.

The outer ring 3 is provided with seal grooves 3a for assembling a shield plate on the inner diameter surfaces of both ends thereof. On the side where the outer ring 3 and the flange 7a at one end of the heat insulating sleeve 7 do not face each other, the outer peripheral end of the metal shield plate 9 is fitted in the seal groove 3a, and this shield plate 9 is The side edge of the gap 4 between the inner ring 2 and the outer ring 3 is closed by bringing the peripheral end close to the outer diameter surface of the inner ring 2.

Although not shown, the heat insulating sleeve 7 is divided at one position in the circumferential direction by a slit. The heat insulating sleeve 7 is fitted into the inner diameter surface of the inner ring 2 while being bent so as to narrow the slit. It is pressed against the inner diameter surface of the inner ring 2 by the elastic restoring force that occurs and is integrated with the bearing. And
This facilitates handling, such as transporting as a unit with the bearing. Further, since the slit is provided, the expansion of the inner diameter is small even when expanded by heat transmitted from the supporting rotating body, and rattling with the rotating body is less likely to occur. The heat-resistant resin forming the heat insulating sleeve 7 may be polyphenylene sulfide, polyimide, polyether ether ketone, or the like.

The flange 7a of the heat insulating sleeve 7 abuts on one end surface of the inner ring 2 and projects to the outer diameter surface of the outer ring 3 to cover one end surface of the outer ring 3. The thickness of the portion that covers the end surface of the outer ring 3 is slightly smaller than the thickness of the portion that contacts the end surface of the inner ring 2 so that the outer ring 3 does not come into contact with the outer ring 3 even if the outer ring 3 moves axially by the dimensional tolerance and the axial gap. It is thinly formed.

Further, an annular convex portion 7b is formed on the surface of the flange 7a which faces the inner and outer races 2, 3 end surface, and the convex portion 7b is inserted into the gap 4 between the inner race 2 and the outer race 3. Thus, one end of the gap 4 is closed. The size of the convex portion 7b is
The outer ring 3 is formed so as to be close to the inner wall of the seal groove 3a of the outer ring 3 within a range in which the outer ring 3 does not come into contact with the outer ring 3 even if the outer ring 3 moves in the axial direction or vibrates in the radial direction.

That is, the heat insulating sleeve-integrated bearing 1
Then, the convex portion 7b formed on the flange 7a of the heat insulating sleeve 7 is inserted so as to come close to the outer ring 3 up to the inner side of the gap 4 between the inner ring 2 and the outer ring 3. Therefore, on the side of the heat insulating sleeve 7 where the flange 7a is provided, due to the labyrinth sealing effect between the convex portion 7b and the outer ring 3,
The sealing performance is higher than that of the conventional bearing in which the shield plates are installed on both sides, and the sealing performance is maintained even if the outer ring 3 moves in the axial direction. Moreover, one of the two shield plates, which was required in the prior art, is no longer required, so the cost is low and maintenance is simple.

The seal groove 3a in which the shield plate is not incorporated in the outer ring 3 is provided in order to divert the cost of the outer ring of the conventional bearing. Therefore, when importance is attached to the sealing performance, the sealing groove 3a on the side where the convex portion 7b of the heat insulating sleeve 7 is inserted can be eliminated and the gap between the convex portion 7b and the sealing groove 3a can be reduced to further improve the sealing performance. .

FIG. 2 shows a state in which the heat roller 10 equipped with the bearing 1 of this embodiment is incorporated in a fixing device of a copying machine. The heat roller 10 arranged in parallel with the pressure roller 11 and having the heater 12 and the drive gear 13 attached thereto,
Both ends thereof are supported by the bearing 1, and the positions of the bearing 1 in the axial direction are fixed by the retaining rings 8 of the bearing 1. The bearing 1 is mounted on the heat roller 10 with the flange 7a of the heat insulating sleeve 7 facing the outside of the device, and has high sealing performance against foreign matter entering from the outside of the housing 14.

FIG. 3 shows a second embodiment. In this heat insulating sleeve-integrated bearing, flanges 15a are provided at both ends of the heat insulating sleeve 15, and the heat insulating sleeve 15 is divided into two in the axial center, and each flange 15a has an inner ring as in the first embodiment. 2 is inserted into the gap 17 between the outer ring 16 and the outer ring 16 to close the side end of the gap 17
5b is formed. Insulation sleeve 15 divided into two
Can be easily fitted from both sides of the bearing. Outer ring 1
No seal groove is provided on the inner diameter surface of 6, and no shield plate is incorporated. The configuration of other parts is the same as that of the first embodiment.

In this embodiment, the both ends of the gap 17 between the inner ring 2 and the outer ring 16 are provided with the convex portions 15b of the heat insulating sleeve 15.
Since it is closed by and there is no seal groove for the outer ring 16, the sealability is further superior to that of the first embodiment. Moreover, since it is not necessary to incorporate a shield plate and a general-purpose open type bearing can be used, the cost can be further reduced and the maintainability is further improved.

In each of the above-mentioned embodiments, the convex portion of the heat insulating sleeve is provided in an annular shape. However, the convex portion may be divided into two or more in the circumferential direction as long as it does not greatly affect the sealing performance. it can.

[0024]

As described above, in the heat insulating sleeve-integrated bearing of the present invention, a convex portion is formed on the flange provided at at least one end of the heat insulating sleeve, and the convex portion is inserted into the gap between the inner ring and the outer ring. Since the one end of the gap is closed and the labyrinth seal effect is obtained between the convex part and the outer ring, the sealing performance is higher than that of the conventional bearing that incorporates shield plates on both sides. In addition, the number of parts is small, and it can be manufactured at low cost.

[Brief description of drawings]

1A is a vertical sectional view of a heat insulating sleeve-integrated bearing of a first embodiment, and b is an enlarged vertical sectional view of a main part of a.

FIG. 2 is a front view of a fixing device that uses the heat insulating sleeve-integrated bearing according to the first embodiment.

FIG. 3 is a vertical cross-sectional view of a main part of a heat insulating sleeve-integrated bearing according to a second embodiment.

FIG. 4 is a vertical cross-sectional view of a main part of a conventional heat insulating sleeve-integrated bearing.

[Explanation of symbols]

1 Bearing with integrated heat insulating sleeve 2 inner ring 3 outer ring 3a Seal groove 4 gap 5 balls 6 cage 7 sleeve 7a flange 7b convex part 8 retaining rings 9 Shield plate 10 heat roller 11 Pressure roller 12 heater 13 gears 14 housing 15 sleeves 15a flange 15b convex part 16 outer ring 17 Gap

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yama-saki, Masayuki             7-22-17 Nishigotanda, Shinagawa-ku, Tokyo d             Inside Nutien Co., Ltd. F-term (reference) 2H033 AA23 BB36                 3J016 AA01 BB02 CA07                 3J017 AA02 DA02                 3J103 AA02 BA02 DA05 FA22 GA52                       GA57 GA58

Claims (2)

[Claims] 1. An inner ring, an outer ring, a plurality of rolling elements accommodated between the inner and outer rings, and a heat insulating sleeve fitted to an inner diameter surface of the inner ring, wherein at least one end of the heat insulating sleeve has an outward flange. And a heat-insulating sleeve-integrated bearing in which a convex portion that is inserted into a gap between the inner ring and the outer ring and closes one side end of the gap is provided on a surface of the flange facing the bearing-side end surface. 2. The heat insulating sleeve-integrated bearing according to claim 1, wherein the heat insulating sleeve is formed of a resin having heat resistance.