JP2582960Y2 - Current bearing - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a current-carrying bearing for electrically short-circuiting an inner ring and an outer ring.

[0002]

2. Description of the Related Art For example, a bill transporting roller shaft of an automatic teller machine (ATM) and each shaft used in an image forming apparatus need to ground charged electricity or the like. For this reason, a current-carrying bearing has been conventionally used for such a shaft bearing. FIGS. 5 and 6 show the structure of a conventional representative current-carrying bearing A. FIG.

Referring to FIGS. 5 and 6, a current-carrying bearing A has a conductive current-carrying brush 13 fitted between outer ring 11 and inner ring 12 to short-circuit outer ring 11 and inner ring 12. To ground. A rubber seal 15 is fitted in a sealing groove 15a provided in the outer ring 11, and the elasticity of the rubber seal 15 is used to press the current brush 13 and hold it between the inner and outer rings. Further, the rubber seal 15 also serves as a sealing inside the bearing A.

The energizing brush 13 is formed by forming a linear spring steel or the like into a ring shape, and bending a predetermined portion on the circumference of the ring inward to form a contact 14. The energizing brush 13 is fitted and fixed to the outer ring 11 with the contactor 14 slidably contacting the outer peripheral surface of the inner ring 12.

[0005]

However, among the places where the current-carrying bearing is used, there is a problem particularly when the bearing is used for a heat roller portion of a copying machine. That is, since the heat roller portion and the like of the copying machine are exposed to a high temperature, the rubber seal 15 is softened by heat and the elasticity is reduced, and the sealing property of the bearing is reduced. It becomes loose. As a result, the energizing brush 13 is warped, and the rubber seal 15 is detached due to rotation, or grease leaks.

On the other hand, with respect to the problem of softening of the rubber seal 15 due to heat, even if an expensive material such as fluororubber is used for the rubber seal 15, the heat-resistant temperature is limited to about 180 ° C. It cannot withstand the use for etc. It is also conceivable to perform sealing using a so-called shield plate. However, this shield plate is formed by pressing a steel plate. When the shield plate is superimposed on the conductive brush 13 formed of a wire, there is a partial gap, and sufficient sealing cannot be ensured. In addition, shield plates are generally
It is fitted in an annular groove formed in the inner peripheral portion of the outer race 11,
When the wire is fitted over the wire as described above, the shield plate may be deformed and the sealing performance may be impaired.

Accordingly, an object of the present invention is to provide a current-carrying bearing that ensures a good current-carrying state even at a high temperature and that does not deteriorate the sealing performance.

[0008]

According to the present invention, there is provided an energized bearing in which an energized brush for electrically short-circuiting an inner ring and an outer ring is fitted into an annular groove provided at an end of an outer ring. An annular metal sealing plate attached to the outer ring from the outside of the side surface of the bearing and covering and sealing between the inner and outer rings of the bearing is provided, and the sealing plate presses the energizing brush from outside the side surface of the bearing. A pressing portion for holding the contact state between the energizing brush and the outer ring, and being fitted and stopped on the outer peripheral surface of the outer ring while extending radially outward from the pressing portion and covering the end surface of the outer ring. And an extended portion for fixing the sealing plate to the outer ring.

[0009]

According to the present invention, since the extending portion of the sealing plate is fitted on the outer peripheral surface of the outer ring, which has a sufficient space and can secure a sufficient fitting width, the sealing plate is surely a bearing. Fixed to Since the energizing brush is pressed by the pressing portion of the sealing plate securely fixed, the contact state between the energizing brush and the outer ring is reliably maintained. Moreover, since the sealing plate is made of metal, the sealing plate is excellent in heat resistance, and there is no danger that the pressing of the current brush becomes loose due to a decrease in elasticity due to heat unlike a conventional rubber seal. Therefore, even at high temperatures, the contact state between the energizing brush and the outer ring is reliably maintained.

Further, as described above, since the extending portion of the sealing plate is fitted and stopped with a sufficient fitting width on the outer peripheral surface of the outer race, the sealing plate ensures sufficient sealing performance of the bearing. be able to. In addition, since the elasticity of the sealing plate does not decrease due to heat, the sealing performance of the bearing does not decrease even at a high temperature.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 is an enlarged view of a main part in a state where a current-carrying bearing B according to an embodiment of the present invention is mounted on a shaft S and fitted into a casing C. Referring to FIG. 1, this energized bearing B includes an outer ring 1 having a ring groove 11 a formed therein and an inner ring 2.
And a ball 5 as a rolling element held and interposed between the inner and outer rings by a retainer 51.
This is a so-called NR type bearing which is positioned in the casing C by the retaining ring 11 fitted in the inner ring a, and the energizing brush 3 is fitted between the inner and outer rings 1 and 2 to electrically connect the inner and outer rings 1 and 2. Short-circuited. Further, a sealing plate 4 is fitted and mounted from the outside of the side surface of the energizing bearing B, and a part of the sealing plate 4 abuts on the energizing brush 3 and the energizing brush 3 separates from the bearing B. It is structured to prevent this.

At a predetermined position on the outer side of the inner peripheral surface 1a of the outer ring 1, a groove 12 is formed in the circumferential direction.
An electric brush 3 to be described later is fitted therein. Referring to FIG. 4, energizing brush 3 has a substantially circular shape formed by bending a wire such as spring steel, and has a circular ring portion 31.
And a contact 32. The contact 32 is formed by bending both ends of the ring portion 31 to the inside of the ring portion 31.

FIG. 2 is a sectional view of a principal part of the sealing plate 4, and FIG. Referring to FIGS. 2 and 3, this sealing plate 4 is a bottomed cylindrical member manufactured by press-forming a metal flat plate such as stainless steel. , 2, a pressing portion 42 for pressing the energizing brush 3, and an extending portion 41 which is fitted and fixed to the outer ring 1 of the bearing B and fixes the sealing plate 4 to the outer ring 1. . Further, the bearing B is provided at the center of the seal portion 43.
Hole 4 having a hole diameter slightly larger than the outer diameter of the inner ring 2
4 are provided.

The sealing portion 43 is a part of the bottom of the cylindrical sealing plate 4 having the bottom. One end 43a of the seal portion 43 is continuous with the other end 42c of the pressing portion 42, which will be described later, and the inclined portion 43b slightly projects outward from the bearing B with the sealing plate 4 mounted on the bearing B. have. The seal portion 43 covers between the inner and outer rings 1 and 2 of the bearing B, and seals the inside of the bearing B.

The pressing portion 42 has a substantially L-shaped cross section. One end 42c of the pressing portion 42 is continuous with one end 43a of the seal portion 43, and projects toward the bearing B with the sealing plate 4 mounted on the bearing B. Therefore, the bottom of the sealing plate 4 is raised by the pressing portion 42. Further, the protruding pressing portion 42
The surface perpendicular to the axial direction constitutes the pressing surface 42a. The pressing surface 42 a contacts the electric brush 3. The amount by which the pressing portion 42 protrudes toward the bearing B is determined from the outer side surface of the outer ring 1 of the bearing B.
It is set to correspond to the distance to the side of.

The extending portion 41 is provided at the other end 4 of the pressing portion 42.
2b, with the sealing plate 4 mounted on the bearing B,
The outer ring 1 covers the end face and extends radially outward from the pressing portion 42. Therefore, the outer edge of the cylindrical sealing plate 4
It has a bottom and a cylindrical wall. In addition, this extension part 4
Reference numeral 1 is substantially L-shaped in cross section, like the pressing portion 42, and includes a guide portion 41b and a fitting ring 41a which is continuous with the guide portion 41b in a direction perpendicular to the guide portion 41b. This fitting ring 4
1 a is fitted on the outer peripheral surface of the outer race 1, and the guide portion 41 b contacts the side surface of the outer race 1 to position the sealing plate 4 with respect to the bearing B. The width of the fitting ring 41a is set corresponding to the distance from the outer side surface of the outer ring 1 of the bearing B to the ring groove 11a. That is, if the extended portion 41 is fitted to the outer peripheral surface of the outer race 1 and the sealing plate 4 is positioned by the guide portion 41b, the pressing surface 42a is set so as to reliably press the energizing brush 3. I have.

The assembly of the bearing B according to this embodiment will be described with reference to FIGS.
Is reduced in the radial direction, and the ring portion 31 of the energizing brush 3 is fitted into the groove 12 formed in the outer ring 1 of the bearing B. In this state, the contact 32 of the energizing brush 3 contacts the inner ring 2 of the bearing B, thereby electrically short-circuiting the inner and outer rings 1 and 2 of the bearing B. Next, in a state where the outer ring 1 of the bearing B is pressed into the cylindrical sealing plate 4, the extending portion 41 of the sealing plate 4 is fitted and stopped on the outer ring 1. In this state, the sealing plate 4 is fitted and fixed to the outer ring 1 of the bearing B, and the pressing surface 42a of the sealing plate 4 is in contact with the side surface of the energizing brush 3 to hold down the energizing brush 3. The inner and outer rings 1 and 2 of the bearing B are electrically short-circuited.

According to this embodiment, the sealing plate 4 is fitted and stopped on the outer peripheral surface of the outer ring 1 of the bearing B by the fitting ring 41a of the extending portion 41. Since there is enough room to secure a sufficient fitting width,
The sealing plate 4 is securely fixed to the bearing B. In addition, the sealing plate 4
Has a protrusion amount corresponding to the distance from the outer side surface of the outer ring 1 of the bearing B to the side surface of the energizing brush 3, so that the pressing surface 42 a of the sealing plate 4 Make sure it touches. Therefore, the energizing brush 3 is reliably pressed against the outer ring 1 by the pressing portion 42 of the sealing plate 4 securely fixed to the bearing B, and the contact state between the energizing brush 3 and the outer ring 1 is reliably maintained. You. Further, since the sealing plate 4 is made of metal, the elasticity is reduced by heat and the pressing of the energizing brush 3 is not loosened unlike the conventional rubber seal. And the outer ring 1 is reliably held in contact with the outer ring 1.

Further, since the extending portion 41 is fitted to the outer ring 1, a sufficient sealing property between the inner and outer rings 1 and 2 of the bearing B can be ensured. Moreover, since the sealing plate 4 is made of metal, the elasticity does not decrease due to heat, and the sealing performance does not decrease even when used at high temperatures. Therefore, even when the bearing B is used under a high temperature such as a heat roller portion of a copying machine, the pressing of the energizing brush 3 is loosened by the influence of heat, and grease or the like is formed between the energizing brush 3 and the outer ring 1 of the bearing B. Can be prevented from entering, and the inner and outer rings 1 and 2 of the bearing B can be prevented from being in an insulated state, and the sealing performance of the bearing B does not deteriorate.

The present invention is not limited to the above embodiment. For example, although the sealing plate 4 is formed by press forming which is advantageous in cost, the extending portion 41, the working portion 42 and the lip portion 43 are As a separate member, it may be manufactured by welding or the like. In addition, besides manufacturing the energizing brush 3 by bending a wire, it is possible to make various design changes such as a conductive metal plate and a conductive rubber seal type within a range that does not change the gist of the present invention.

[0021]

According to the present invention, since the extending portion of the sealing plate is fitted to the outer peripheral surface of the outer ring of the bearing which can secure a sufficient fitting width, the sealing plate has good sealing performance between the inner and outer rings. In this state, it is securely fixed to the bearing. The energizing brush is reliably pressed against the outer ring by the pressing portion of the sealing plate securely fixed, so that the contact state between the outer ring and the energizing brush is reliably maintained. In addition, since the sealing plate is made of metal, it has heat resistance, and the elasticity of the sealing plate is not reduced by the influence of heat, so that the pressing of the current brush is not loosened. Therefore, even when used at a high temperature, it is possible to prevent grease or the like from entering between the energizing brush and the outer ring, and to prevent the inner and outer rings of the bearing from being insulated.

Accordingly, it is possible to provide a current-carrying bearing that can maintain a good current-carrying state even when used at a high temperature and that does not reduce the sealing performance of the bearing.

[Brief description of the drawings]

FIG. 1 is an enlarged view of a main part of a current-carrying bearing according to an embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of a sealing plate.

FIG. 3 is a part of an I-arrow view of a sealing plate.

FIG. 4 is a front view of an energizing brush.

FIG. 5 is a longitudinal sectional view of a conventional energized bearing.

FIG. 6 is a cross-sectional view of a conventional energized bearing.

[Description of Signs] 1 outer ring 2 inner ring 3 energizing brush 4 sealing plate 41 extended portion 42 pressing portion B energizing bearing

Claims (1)

(57) [Scope of request for utility model registration] 1. An energizing bearing in which an energizing brush for electrically short-circuiting an inner ring and an outer ring is fitted into an annular groove provided at an end of an outer ring, the energizing brush is fitted to the outer ring from outside the side surface of the bearing. An annular metal sealing plate is provided to cover and seal between the inner and outer rings of the bearing, and the sealing plate presses the energizing brush from outside the side surface of the bearing to abut the energizing brush and the outer ring. A pressing portion that holds the state, by being fitted to the outer peripheral surface of the outer ring while extending radially outward from the pressing portion and covering the end surface of the outer ring,
An extending part for fixing the sealing plate to the outer race.