JP2015206433A - sealed rolling bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealed rolling bearing capable of preventing damage of a seal lip in assembly without increasing the number of components.SOLUTION: A sealed rolling bearing includes a seal member 20 contacting with the outer peripheral surface of an inner ring 14. The seal member 20 includes a core grid 21 and a seal part 22 fastened to the core grid 21. The seal part 22 includes a seal lip 23 extending from the inner peripheral edge of the core grid 21 to a radial inside and an axial outside, a dust lip 24 extending from the inner peripheral edge of the core grid 21 to the radial inside and an axial inside, and a sub lip 25 extending from the inner peripheral surface of the seal lip 23 to the radial inside between the base part and tip part of the seal lip 23. The inner diameter of the sub lip 25 is set to be smaller than the inner diameter of the seal lip 23.

Description

  The present invention relates to a sealed type rolling bearing, and more particularly to a sealed type rolling bearing used in, for example, a steel rolling mill.

  Conventionally, in a sealed type rolling bearing used in a steel rolling mill, there has been a problem that a seal lip of a seal member is damaged due to a foreign matter biting or misalignment at the time of incorporation, and the original performance cannot be exhibited. .

  Therefore, a rolling bearing is known that prevents the seal lip from being damaged by assembling the seal member and the slinger in a state where the seal member and the slinger are integrated as a separate part. (For example, refer to Patent Document 1).

JP 2010-242909 A

  However, since the rolling bearing described in Patent Document 1 requires a slinger as a separate member, the work procedure at the time of incorporation increases and the number of parts increases, resulting in an increase in manufacturing cost.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a sealed rolling bearing capable of preventing damage to a seal lip during assembly without increasing the number of parts. is there.

The above object of the present invention can be achieved by the following constitution.
(1) An outer ring, an inner ring, a plurality of rollers disposed between the outer ring and the inner ring, and a seal member that contacts the outer peripheral surface of the inner ring, the seal member being fixed to the core metal and the core metal A seal-type rolling bearing including a seal lip, a seal lip extending radially inward and axially outward from an inner periphery of the cored bar, and a base and a tip of the seal lip And a sub lip extending radially inward from the inner peripheral surface of the seal lip, and the inner diameter of the sub lip is set smaller than the inner diameter of the seal lip.
(2) The sealed type rolling bearing according to (1), wherein a concave groove that accommodates the sub lip is formed on the outer peripheral surface of the inner ring.
(3) The hermetic rolling bearing according to (1) or (2), wherein a protrusion extending outward in the axial direction is formed on a side surface of the seal lip of the sub lip.

  According to the present invention, the seal portion is radially extending from the inner peripheral surface of the seal lip between the seal lip extending radially inward and axially outward from the inner peripheral edge of the core metal, and the base portion and the distal end portion of the seal lip. And the inner diameter of the sub lip is set smaller than the inner diameter of the seal lip. Therefore, when the seal member is assembled in the bearing, the sub lip lifts the seal lip, and the seal lip is the outer peripheral surface of the inner ring. Can be avoided. Therefore, damage to the seal lip during assembly can be prevented without increasing the number of parts.

It is sectional drawing of the roll neck part of the rolling mill by which one Embodiment of the sealed rolling bearing which concerns on this invention was employ | adopted. It is sectional drawing of the sealing type rolling bearing shown in FIG. It is an expanded sectional view of the A section of FIG. It is an expanded sectional view explaining the state of the seal member before incorporating in a bearing. It is an expanded sectional view explaining the state of the sealing member currently assembled in the bearing. It is an expanded sectional view explaining the 1st modification of one Embodiment of the sealing type rolling bearing which concerns on this invention. It is an expanded sectional view explaining the 2nd modification of one embodiment of a sealed type rolling bearing concerning the present invention. It is an expanded sectional view explaining the state of the sealing member currently assembled in the bearing in the 2nd modification.

  Hereinafter, an embodiment of a sealed rolling bearing according to the present invention will be described in detail with reference to the drawings.

  The sealed rolling bearing 10 of this embodiment is a four-row tapered roller bearing, and as shown in FIGS. 1 and 2, a pair of outer rings 12, a double-row outer ring 13, a pair of double-row inner rings 14, and a pair of And a plurality of tapered rollers 15 disposed between the outer ring 12 and the double-row outer ring 13 and the pair of double-row inner rings 14 so as to roll freely. The sealed-type rolling bearing 10 is used with a pair of double-row inner rings 14 fitted into the roll neck 2 of the roll 1 (loose fit).

  Further, an outer ring spacer 16 is disposed between the double row outer ring 13 arranged at the center in the axial direction and the outer ring 12 arranged on both sides in the axial direction, and the pair of outer rings 12 and the double row outer ring 13 are arranged. Positioning in the axial direction is performed. In addition, a fillet ring 3 that is an inner ring pressing member is disposed at one axial end of the pair of double-row inner rings 14 to position the pair of double-row inner rings 14 in the axial direction. A seal 4 such as an O-ring is disposed on the inner peripheral surface of the fillet ring 3, and the seal 4 seals between the inner peripheral surface of the fillet ring 3 and the outer peripheral surface of the roll neck portion 2. Yes. Further, housing seals 6 and 7 are arranged between one end of the housing 5 in the axial direction and the fillet ring 3 and between the other end of the housing 5 in the axial direction and the roll neck portion 2.

  Further, seal holders 18 are provided on the outer sides in the axial direction of the pair of outer rings 12 so as to be sealed with an O-ring 17 between the inner peripheral surface of the housing 5. A seal member 20 that contacts the outer peripheral surface of the double-row inner ring 14 is attached. The sealed rolling bearing 10 is sealed by the seal member 20.

  As shown in FIGS. 3 and 4, the seal member 20 is fixed to the core metal 21 having a substantially U-shaped cross section in which a metal plate such as a steel plate is formed in an annular shape, and is made of rubber or elastomer. An annular seal portion 22 made of an elastic material. The seal member 20 is attached to the seal holder 18 by press-fitting the core 21 into the inner peripheral surface of the seal holder 18.

  The seal portion 22 extends radially inward and axially outward from the inner peripheral edge of the core metal 21, and prevents the water from entering and leaking grease, and radially inward and axially inward from the inner peripheral edge of the core metal 21. And a sub lip 25 extending radially inward from the inner peripheral surface of the seal lip 23 between the base portion and the tip end portion of the seal lip 23. The tip of the sub lip 25 is formed in a sharp shape with a substantially triangular cross section. A garter spring 26 is fitted on the outer peripheral surface of the seal lip 23, and the seal lip 23 is pressed against the outer peripheral surface of the double-row inner ring 14 by the binding force of the garter spring 26.

  As shown in FIG. 4, the inner diameter D <b> 1 of the sub lip 25 is set smaller than the inner diameter D <b> 2 of the seal lip 23 in the seal member 20 before being assembled. That is, the length of the sub lip 25 is set so as to protrude radially inward from the seal lip 23. Therefore, as shown in FIG. 5, when the seal member 20 is assembled into the bearing 10, the sub lip 25 comes into contact with the outer peripheral surface of the double row inner ring 14 before the seal lip 23. It is done. Therefore, since the seal member 20 can be incorporated in the bearing 10 without bringing the seal lip 23 into contact with the outer peripheral surface of the double-row inner ring 14, damage to the seal lip 23 is prevented.

  Further, a concave groove 14 a that accommodates the sub lip 25 after the seal member 20 is assembled is formed on the outer peripheral surface of the double-row inner ring 14 over the entire circumference. The concave groove 14 a is set to a depth that does not contact the lower end of the sub lip 25. For this reason, since the lifting effect of the seal lip 23 by the sub lip 25 is lost after the seal member 20 is assembled, the seal lip 23 comes into contact with the outer peripheral surface of the double-row inner ring 14 and exhibits a sealing function (FIG. 3). reference). Further, the sub lip 25 accommodated in the concave groove 14a forms a labyrinth seal with the concave groove 14a, and the sealing performance of the bearing 10 is improved.

  As described above, according to the sealed rolling bearing 10 of the present embodiment, the sub lip 25 extending radially inward is formed on the inner peripheral surface of the seal lip 23, and the inner diameter D1 of the sub lip 25 is the inner diameter D2 of the seal lip 23. Therefore, when the seal member 20 is assembled into the bearing 10, the seal lip 23 is lifted by the sub lip 25, and the seal lip 23 can be prevented from coming into contact with the outer peripheral surface of the double row inner ring 14. Therefore, damage to the seal lip 23 during assembly can be prevented without increasing the number of parts.

  Further, according to the sealed type rolling bearing 10 of the present embodiment, since the concave groove 14a for accommodating the sub lip 25 is formed on the outer peripheral surface of the double row inner ring 14 after the seal member 20 is assembled, the sub lip 25 is worn away. In addition, a labyrinth seal is formed between the sub lip 25 and the groove 14a, and the sealing performance of the bearing 10 can be improved.

  Further, according to the sealed type rolling bearing 10 of the present embodiment, since the tip of the sub lip 25 is formed in a sharp shape with a substantially triangular cross section, the sub lip 25 is in contact with the outer peripheral surface of the double-row inner ring 14. 25 curved deformations can be easily generated. Thereby, since the incorporation force of the seal member 20 can be reduced, the seal member 20 can be easily incorporated into the bearing 10.

  As a first modification of the present embodiment, as shown in FIG. 6, the concave groove 14 a may not be formed on the outer peripheral surface of the double-row inner ring 14. Even in this case, the sealing lip 23 can provide sufficient sealing performance. Note that this modification is premised on the wear of the sub lip 25 and the replacement of the seal member 20 during disassembly and cleaning.

  Further, as a second modification of the present embodiment, as shown in FIG. 7, a protrusion 25 a that extends outward in the axial direction may be formed on the side surface on the distal end side of the seal lip 23 of the sub lip 25. In this case, as shown in FIG. 8, when the seal member 20 is assembled into the bearing 10, the seal lip 23 is lifted by the sub lip 25 as described above, and the sub lip 25 is inclined so that the protrusion 25 a is the inner peripheral surface of the seal lip 23. The seal lip 23 is lifted also by the protrusion 25a.

  Therefore, according to the present modified example, when the seal member 20 is assembled in the bearing 10, the seal lip 23 is lifted by the sub lip 25 and the protrusion 25a, so that the seal lip 23 is in contact with the outer peripheral surface of the double row inner ring 14. It can be avoided reliably. Therefore, damage to the seal lip 23 during assembly can be further prevented without increasing the number of parts.

In addition, this invention is not limited to what was illustrated by said each embodiment, In the range which does not deviate from the summary of this invention, it can change suitably.
For example, in the above-described embodiment, the case where the present invention is applied to a four-row tapered roller bearing is illustrated. However, the present invention is not limited to this, and the single-row rolling bearing, two-row rolling bearing, six-row rolling bearing, and eight-row The present invention may be applied to a multi-row rolling bearing such as a rolling bearing.
Moreover, in the said embodiment, although the sealing member is attached to the seal holder, it is not limited to this, You may be directly attached to the outer ring | wheel.

DESCRIPTION OF SYMBOLS 10 Sealing type rolling bearing 12 Outer ring 13 Double row outer ring 14 Double row inner ring 14a Recessed part 15 Tapered roller 18 Seal holder 20 Seal member 21 Core metal 22 Seal part 23 Seal lip 24 Dustrip 25 Sub lip 25a Protrusion 26 Garter spring D1 Inner diameter of sub lip D2 Inside diameter of seal lip

Claims (3)

Outer ring,
Inner ring,
A plurality of rollers disposed between the outer ring and the inner ring;
A seal member in contact with the outer peripheral surface of the inner ring,
The seal member is a sealed rolling bearing comprising a cored bar and a seal part made of an elastic member fixed to the cored bar,
The seal portion is
A seal lip extending radially inward and axially outward from the inner periphery of the core metal;
A sub lip extending radially inward from an inner peripheral surface of the seal lip between a base portion and a tip end portion of the seal lip;
A sealed type rolling bearing, wherein an inner diameter of the sub lip is set smaller than an inner diameter of the seal lip.   The sealed rolling bearing according to claim 1, wherein a concave groove that accommodates the sub lip is formed on an outer peripheral surface of the inner ring.   The sealed rolling bearing according to claim 1, wherein a protrusion extending outward in the axial direction is formed on a side surface of the sub lip on the tip side of the seal lip.

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