JP2018071736A - Rolling bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rolling bearing which can inhibit heat generation of the bearing while securing dust resistance in the bearing.SOLUTION: A rolling bearing has: an outer ring serving as a rotation side bearing ring; an inner ring serving as a bearing ring which can rotate relative to the outer ring; rolling elements provided between the outer ring and the inner ring; a holder for holding the rolling elements in a state where the rolling elements are spaced away from each other in a circumferential direction; an annular seal member which is attached at its outer diameter side to the outer ring and does not contact at its inner diameter side with the inner ring; and grease enclosed in a space enclosed by the outer ring, the inner ring, and the seal member. In the inner ring, a grease holding part is formed adjacent to the seal member and the grease is enclosed between the grease holding part and the seal member.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a rolling bearing suitable for a roller transport portion of a device for transporting banknotes used in, for example, an automatic teller machine (ATM) that deposits and withdraws cash and the like.

  Conventionally, in an automatic teller machine (hereinafter referred to as “ATM”) used in financial institutions, a customer deposits cash such as banknotes and coins according to the transaction content desired by the customer, Cash is withdrawn (see Patent Document 1).

  5 to 8 show an example of such ATM described in Patent Document 1. FIG. As shown in FIG. 5, the illustrated ATM 101 has a coin deposit / withdrawal port 111, a banknote deposit / withdrawal port 112, a passbook insertion port 113, a card insertion port 114, and a display operation unit 115 on the side facing the customer. And.

  The coin deposit / withdrawal port 111 and the banknote deposit / withdrawal port 112 are portions into which coins or bills to be deposited by customers are respectively inserted or coins or bills to be dispensed to customers are respectively discharged. Moreover, the passbook insertion port 113 and the card insertion port 114 are portions into which various cards such as a passbook and a cash card used in transactions are inserted or discharged, respectively. Further, the display operation unit 115 is a part for selecting a transaction type and inputting a password, transaction amount, and the like.

  FIG. 6 is a view of the ATM 101 shown in FIG. 5 as viewed from the direction of the arrow E. As shown in FIG. 6, the ATM 101 includes a discrimination unit 104 that discriminates the denomination and authenticity of the inserted banknote, A temporary storage unit 105 that temporarily stores inserted banknotes and a banknote storage unit 106 including a denomination type cassette that stores banknotes for each denomination are provided. What is indicated by a thick line in the figure is a transport path 107 for transporting banknotes between the above-described parts related to the present invention.

  The conveyance path 107 includes a plurality of belt conveyance units 121 (121a, 121b...) And roller conveyance units 120 (120a, 120b...). The belt conveyance unit 121 is provided with two sets of loop-shaped tapes wound around between a pair of rollers arranged opposite to each other. The two sets of tapes hold the banknote from both sides. Transport. The roller conveyance unit 120 is mainly provided between the adjacent belt conveyance units 121 (for example, a roller conveyance unit 120b provided between the belt conveyance units 121a and 121b), and holds the banknotes by a pinch roller and a conveyance roller described later. Then transport.

  The automatic teller machine 101 is entirely controlled by the control unit 108 via the display operation unit 115 (see FIG. 5).

  FIG. 7 shows the roller conveyance unit 120 provided in the ATM 101 shown in FIG. 6. The left side in the figure is the front side of the ATM 101, the right side is the rear side of the ATM 101, the front side of the paper is the right side of the ATM, and the paper surface. The far side is the left side of the ATM. The roller conveyance unit 120 includes a conveyance roller 134 disposed below the drawing, and a pinch roller 136 positioned above the conveyance roller 134 in the drawing.

  The conveyance roller 134 (only the right conveyance roller on the right side in the figure is visible) is rotated clockwise and counterclockwise about a conveyance roller shaft 132 that is fixed to a frame (not shown) and extends in the direction perpendicular to the paper surface in the figure. It is provided freely. Two transport rollers 134 are arranged side by side in the direction perpendicular to the paper surface in the figure with an interval shorter than the length of the bill PM in the long side direction.

  The pinch rollers 136 (only the right-side pinch roller is visible in the drawing) are provided on the upper portions of the respective transport rollers 134 so as to face the transport rollers 134. The pinch roller 136 is mounted in a loose (rigid fit) or rigid (tight fit) state on a pinch roller shaft 138 extending in the direction perpendicular to the paper surface in the drawing (only the right pinch roller shaft on the right side is visible in the figure). It has been. The pinch roller 136 is composed of a rolling bearing 170 as shown in FIG. The rolling bearing 170 is provided between an outer ring 172 rotatable in a clockwise direction CW and a counterclockwise direction CCW, an inner ring 174 attached to the pinch roller shaft 138, and an outer ring 172 and an inner ring 174, as indicated by arrows in the figure. A rolling element 176 and a holder 178 for holding the rolling element 176.

  Returning to FIG. 7, the pinch roller shaft 138 is movable in the vertical direction in the drawing along the rail 152 fixed to the frame, and is fixed to the frame by a leaf spring 156 having a bifurcated tip. Each is always urged in the direction of the conveying roller shaft 132 (in the direction of arrow Y in the figure) while preventing its own rotation. As a result, the pinch roller 136 and the transport roller 134 are pressed against each other.

  For example, when the banknote PM is transported along the banknote transport path 164 from the right side in FIG. 7, the roller transport unit 120 described above rotates with the transport roller 134 rotating counterclockwise and the rotation of the transport roller 134. The bill PM is sandwiched from above and below by the bearing outer ring 172 of the pinch roller 136 (rolling bearing 170) that is rotated clockwise in the drawing and is conveyed to the left in the drawing.

  At this time, the rolling bearing 170 (see FIG. 8) is filled with grease between the outer ring 172 and the inner ring 174 in order to smoothly rotate the outer ring 172. However, if the grease leaks to the outside and adheres to the banknote, the banknote may be soiled. Also, if grease is exhausted due to grease leakage, smooth rotation of the outer ring becomes difficult, and the banknotes are not smoothly transported and the banknotes are folded between the front banknotes and a paper jam occurs. There is a risk of causing this. Furthermore, if foreign matter such as paper dust from the banknotes rolls from between the outer ring and the inner ring and enters the bearing, smooth rotation of the bearing becomes difficult, which may cause paper jams as well. .

JP 2014-56596 A

  In view of the circumstances as described above, an object of the present invention is to provide a rolling bearing capable of smoothly rotating a bearing while ensuring dustproofness in the bearing.

In order to achieve the above object, the rolling bearing according to the present invention is configured as follows.
(1) an outer ring as a raceway on the rotation side;
An inner ring which is a raceway ring rotatable relative to the outer ring;
Rolling elements provided between the outer ring and the inner ring;
A cage for holding the rolling elements in a circumferentially spaced state;
An annular seal member having an outer diameter side attached to the outer ring and an inner diameter side not in contact with the inner ring;
Grease sealed in a space surrounded by the outer ring, the inner ring, and the seal member;
In a rolling bearing having
A rolling bearing, wherein a grease holding portion is formed adjacent to the seal member in the inner ring, and the grease is sealed between the grease holding portion and the seal member.
(2) The grease retaining portion formed on the inner ring includes a step portion having a small diameter portion extending substantially parallel to the axial direction of the rolling bearing and a standing wall portion extending in a direction substantially perpendicular to the axial direction of the rolling bearing. The rolling bearing according to (1), wherein at least a part of the grease is sealed between the seal member and the standing wall portion of the inner ring.
(3) The grease holding portion formed in the inner ring has a groove formed in the circumferential direction of the inner ring, and at least a part of the grease is sealed between the groove of the seal member. The rolling bearing according to (1) above.
(4) The seal member includes an attachment portion attached to the outer ring, an inclined portion extending outward from the attachment portion to the bearing, and a vertical portion extending from the inclined portion toward the inner ring. Or the rolling bearing as described in (2).
(5) The rolling bearing according to (1) or (2), wherein the seal member includes an attachment portion attached to the outer ring and a vertical portion extending from the attachment portion toward the inner ring.
(6) The seal member includes an attachment portion attached to the outer ring, a vertical portion extending from the attachment portion toward the inner ring, an outer bent portion extending from the vertical portion toward the bearing outer side, and the outer portion. The rolling bearing according to (5), further including a second vertical portion extending from the unidirectionally bent portion toward the inner ring.
(7) The rolling bearing according to (5) or (6), wherein the seal member is pressed and attached to the outer ring by a snap ring provided adjacent to the bearing outer side of the attachment portion.

  According to the present invention, the inner ring is formed with the grease holding portion, and at least a part of the grease is sealed between the seal member and the grease holding portion, so that the bearing inner portion is interposed between the seal member and the inner ring. It is possible to prevent foreign matter such as paper dust from entering. Moreover, since the seal member is not in contact with the inner ring, the outer ring can be smoothly rotated.

It is sectional drawing of the rolling bearing which concerns on 1st Embodiment of this invention. It is the figure which showed the state before attaching a sealing member by A arrow line view of FIG. It is sectional drawing of the rolling bearing which concerns on 2nd Embodiment of this invention. It is sectional drawing of the rolling bearing which concerns on 3rd Embodiment of this invention. It is a perspective view which shows the external appearance of ATM. FIG. 6 is a view of the ATM shown in FIG. It is explanatory drawing of a roller conveyance part. It is explanatory drawing of the pinch roller currently used for the roller conveyance part.

Embodiments of the present invention will be described below with reference to the drawings as appropriate.
(First embodiment)

  FIG. 1 shows a cross-sectional view of a rolling bearing according to a first embodiment of the present invention, and FIG. 2 is a view showing a state before a seal member is attached as viewed in the direction of arrow A in FIG. The rolling bearing 10 (hereinafter, also simply referred to as “bearing”) is for use as, for example, a pinch roller 136 shown in FIG. 7, and is a single row deep groove ball bearing. The rolling bearing 10 includes a plurality of outer rings 12 that are rotating raceways, an inner ring 14 that is a raceway that can rotate relative to the outer ring, and a plurality of rolling bearings that are disposed between the outer ring 12 and the inner ring 14. Rolling element 16, a retainer 18 that holds the rolling element 16, and a pair of seal members 20 and 20.

  The outer ring 12 is preferably made of bearing steel (for example, SUJ2), and an outer ring raceway groove 12a is formed on the inner peripheral surface. Further, seal grooves 12b and 12b for attaching the seal members 20 and 20 are formed at both ends in the axial direction (left and right direction in FIG. 1). The outer ring outer peripheral surface is a clamping surface for clamping, for example, banknotes.

  The inner ring 14 is preferably made of bearing steel (for example, SUJ2), and an inner ring raceway groove 14a facing the outer ring raceway groove 12a is formed on the outer peripheral surface. Further, step portions 14 c as grease holding portions are formed at both axial ends of the inner ring 14. The step portion 14 c includes a small-diameter portion 14 d that extends substantially parallel to the axial direction of the rolling bearing 10 and a standing wall portion 14 e that extends in a direction substantially perpendicular to the axial direction of the rolling bearing 10. The inner peripheral surface of the inner ring 14 is formed in a cylindrical shape, and can be attached to the rotating shaft 4 with a loose (gap fit) or a rigid (tight fit). Regardless of the mounting state, the inner ring 14 is relative to the outer ring 12 regardless of whether the difference in relative rotation between the inner ring 14 and the outer ring 12 is small (in the case of loose) or large (in the case of rigid). It can be rotated.

  The ball 16 as the rolling element is preferably made of bearing steel (eg, SUJ2), and is disposed between the outer ring raceway groove 12a and the inner ring raceway groove 14a so as to be able to roll.

  The cage 18 is used for arranging a plurality of balls 16 at substantially equal intervals in the circumferential direction, and is a crown type cage having one end side in the axial direction (left side in FIG. 1) opened. The cage 18 is made of synthetic resin such as nylon 46, nylon 66, polyphenylene sulfide (PPS), polytetrafluoroethylene (PTFE), polyetheretherketone (PEEK). In addition, it may replace with a crown type holder | retainer and may use the press holder | retainer made from an iron plate.

  The shields 20 and 20 as a pair of seal members are each made of metal (for example, SUS material), and the whole is an annular shape. The shield 20 includes an attachment portion 20a attached to the seal groove 12b of the outer ring 12, an inclined portion 20b extending outward from the bearing from the attachment portion 20a, and a vertical portion 20c extending from the inclined portion 20b to the inner ring 14 side. ,have.

The outer diameter side end of the mounting portion 20a of the shield 20 is an inclined bent portion 20d that is bent obliquely toward the bearing outer side. The shield 20 is attached to the outer ring 12 by pressing and crimping the inclined bent portion 20d in the direction F in the drawing.

  The grease G is sealed so that at least a part thereof is positioned between the vertical portion 20c of the shield 20 and the inner ring step portion 14c. Further, the grease G is also enclosed in a region of the bearing inner space adjacent to the space between the vertical portion 20c of the shield 20 and the standing wall portion 14e of the inner ring 14 so as not to protrude outward from the bearing. As the type of the grease G, for example, urea grease using urea as a thickener and having a low consistency that makes it difficult for the grease G to soften can be used.

  The grease G is sealed before the shield 20 is attached to the outer ring 12. As shown in FIG. 2A, the grease G is applied in a bead shape on the outer peripheral surface 14b of the inner ring by a nozzle unit (not shown). As shown in b), it is applied in a ring shape. Thereafter, as described above, the shield 20 is caulked in the direction F of FIG. As a result, at least a portion is located between the vertical portion 20c of the shield 20 and the inner ring 14, and the grease G is also sealed in the adjacent bearing internal space.

  Next, the operation of the bearing 10 will be described.

The bearing 10 of the present embodiment is used with an inner ring 12 attached to a rotating shaft 4 such as a pinch roller shaft of a roller transport unit. In use, the conveyance roller and the pinch roller (rolling bearing) pressed against the conveyance roller are rotated together to convey the banknote.

At this time, the shield 20 provided between the inner ring 14 and the outer ring 12 is not in contact with the inner ring 14. Therefore, regardless of whether the inner ring 14 is loosely or rigidly attached to the rotating shaft, the outer ring 12 that rotates relative to the inner ring 14 rotates smoothly.

Further, at least a part of the grease G is located between the inner diameter side end of the vertical portion 20 c of the shield 20 and the small diameter portion 14 d of the inner ring 14 and between the vertical portion 20 c of the shield 20 and the standing wall portion 14 e of the inner ring 14. Therefore, it is possible to prevent foreign matter such as scattered paper dust from entering the bearing 10. When the inner ring 14 is loosely attached to the rotation shaft, centrifugal force acts on the grease G due to the rotation of the inner ring that rotates with the outer ring 12, but the inner diameter side end of the shield 20 and the small diameter portion 14 d of the inner ring 14. The grease G located between the inner ring side and the inner ring side is prevented from moving toward the outer ring 12 by the inner diameter side end. Further, since the grease positioned between the shield 20 and the inner ring standing wall portion 14e is further prevented from moving toward the outer ring 12 by the grease G covering the outside, the dustproof effect is maintained. When the inner ring 14 is rigidly attached to a rotation shaft that is prevented from rotating, the inner ring 14 does not rotate, so that the inner ring 14 is positioned between the inner diameter side end portion of the shield 20 and the small diameter portion 14d of the inner ring 14. The centrifugal force does not act on the grease G.

  In addition, when the inner ring 14 is rotated around the outer ring 12, the rotational speed of the inner ring 14 is not so high, so that the centrifugal force acting on the grease G is relatively small, and the low consistency grease G is shielded 20 by so-called channeling. Form a wall between them. And the dustproof effect is further heightened by forming a labyrinth between this wall and the shield 20.

  As described above, according to the present embodiment, a step portion is formed in the inner ring, and at least a part of the grease G is sealed between the step portion and the shield 20, and the grease G is held by the step portion 14c. Thus, foreign matter such as toner can be prevented from entering the bearing from between the shield 20 and the inner ring 14. Furthermore, the dust-proof effect is enhanced by channeling the grease G moving to the vicinity of the shield 20. Further, since the shield 20 is not in contact with the inner ring 14, the bearing (outer ring 12) can be smoothly rotated.

(Second Embodiment)
Next, a second embodiment in which the structure of the seal member and the inner ring is changed will be described with reference to FIG. In the following embodiments, members that are substantially the same as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. In the rolling bearing 30 of the present embodiment, the shield 40 as a seal member is bent at the radial intermediate portion. An upper end portion of the shield 40 is an attachment portion 40a attached to the seal groove 32b of the outer ring 32, a vertical portion 40c extending toward the inner ring 34 on an extension line of the attachment portion 40a, and from the vertical portion 40c to the bearing outer side. The outer bent portion 40d extends and the second vertical portion 40e extends from the outer bent portion 40d toward the inner ring 34.

The shield 40 is attached to the outer ring 32 by being pressed inward of the bearing by the adjacent snap ring 41. That is, the snap ring 41 is in contact with the tapered portion 32c of the seal groove 32b of the outer ring 32 in a state in which a spring force acts in the diameter increasing direction, and due to the component force in the axial direction of the reaction force acting from the tapered portion 32c, The shield 40 is pressed into the seal groove 32b.

Further, a step provided with both ends of the inner ring 34 in the axial direction is provided with a small diameter portion 34d extending substantially parallel to the axial direction of the rolling bearing 30 and a standing wall portion 34e extending in a direction substantially perpendicular to the axial direction of the rolling bearing 30. The part 34 c is formed over the entire circumference of the inner ring 34 in the circumferential direction. The small diameter portion 34d of the stepped portion 34c is opposed to the inner diameter side end portion of the second vertical portion 40e of the shield 40, and the standing wall portion 34e is opposed to the second vertical portion 40e of the shield 40.

In such a configuration, in addition to the effect exhibited by the first embodiment, the grease G that is about to move to the outer ring 32 side due to the centrifugal force is prevented from moving by the outward bent portion 40d, so that the dustproof effect is achieved. Can be increased.

(Third embodiment)
Next, a third embodiment in which the structure of the grease holding portion is changed will be described with reference to FIG. In the rolling bearing 50 of the present embodiment, a groove 54c extending in the circumferential direction is formed in the inner ring 54 as a grease holding portion. Thereby, the grease G sealed in the bearing 50 is held at a predetermined position in the axial direction of the bearing 50. The shield 60 is attached to the outer ring 52 by pressing and curling the curled attachment portion 60a in the direction P in the drawing.

Even in such a configuration, since the grease G can be held at a predetermined position by the groove 54c, the same effect as the first embodiment can be obtained. That is, at least a part of the grease G held by the groove 54c is held between the inner diameter side end of the vertical portion 60c of the shield 60 and the inner ring 54 and between the vertical portion 60c of the shield 60 and the groove 54c of the inner ring 54. By doing so, it is possible to prevent foreign matter such as scattered paper dust from entering the bearing 50. When the inner ring 54 rotates around the outer ring 52, centrifugal force acts on the grease G. However, the grease G located between the inner diameter side end of the shield 60 and the inner ring outer peripheral surface 54b is smaller than the inner diameter side. The movement toward the outer ring 52 side is prevented by the end portion. Further, since the grease G positioned between the shield 60 and the groove 54c of the inner ring 54 is further prevented from moving toward the outer ring 52 by the grease G covering the outer side, the dustproof effect is maintained.

(Modification)
As a modification of the above-described embodiment, in the first embodiment shown in FIG. 1, a groove of the third embodiment shown in FIG. 4 is formed in the inner ring instead of the stepped portion, or the shield is shown in the second embodiment shown in FIG. The inner ring, the outer ring, and the shield (and the snap ring) of each embodiment may be changed to those of other embodiments, such as changing to a shield and a snap ring of the form. Moreover, you may make it extend straight toward the level | step-difference part of an inner ring, without bending the radial direction intermediate part in FIG. Even in these cases, the effects described in the embodiments can be obtained.

  Note that the rolling bearing of the present invention is not limited to those exemplified in the above embodiment, and can be appropriately changed without departing from the gist of the present invention. For example, in the above-described embodiment, an example of an ATM roller conveyance unit has been described. However, the medium to be conveyed is a paper medium, such as a copying machine or a facsimile machine, and a foreign substance such as paper dust enters. The present invention is also applicable to an apparatus used in such an environment.

10, 30, 50 Rolling bearings 12, 32, 52 Outer rings 14, 34, 54 Inner rings 14c, 34c Stepped portions 14d, 34d Small diameter portions 14e, 34e Standing wall portion 16 Rolling element 18 Cage 20, 40, 60 Shields 20a, 40a, 60a Mounting portion 20b, 60b Inclined portion 20c, 40c, 60c Vertical portion 40d Outward bent portion 40e Second vertical portion 41 Snap ring G Grease

Claims (7)

An outer ring as a rotating raceway,
An inner ring which is a raceway ring rotatable relative to the outer ring;
Rolling elements provided between the outer ring and the inner ring;
A cage for holding the rolling elements in a circumferentially spaced state;
An annular seal member having an outer diameter side attached to the outer ring and an inner diameter side not in contact with the inner ring;
Grease sealed in a space surrounded by the outer ring, the inner ring, and the seal member;
In a rolling bearing having
A rolling bearing, wherein a grease holding portion is formed adjacent to the seal member in the inner ring, and the grease is sealed between the grease holding portion and the seal member.   The grease retaining portion formed on the inner ring has a step portion including a small diameter portion extending substantially parallel to the axial direction of the rolling bearing and a standing wall portion extending in a direction substantially perpendicular to the axial direction of the rolling bearing. 2. The rolling bearing according to claim 1, wherein at least a part of the grease is sealed between the seal member and the standing wall portion of the inner ring.   The grease holding portion formed on the inner ring has a groove formed in a circumferential direction of the inner ring, and at least a part of the grease is sealed between the seal member and the groove. The rolling bearing described.   The said seal member has an attaching part attached to the said outer ring | wheel, the inclination part extended to the bearing outer side from this attachment part, and the perpendicular | vertical part extended to the said inner ring | wheel side from this inclination part. Rolling bearing.   The rolling bearing according to claim 1, wherein the seal member has an attachment portion attached to the outer ring and a vertical portion extending from the attachment portion toward the inner ring.   The seal member includes an attachment portion attached to the outer ring, a vertical portion extending from the attachment portion toward the inner ring, an outer bent portion extending from the vertical portion toward the bearing outer side, and the outer bent portion. The rolling bearing according to claim 5, further comprising a second vertical portion extending from the inner ring side to the inner ring side. The rolling bearing according to claim 5, wherein the seal member is pressed and attached to the outer ring by a snap ring provided adjacent to the bearing outer side of the attachment portion.

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