JPH064098Y2 - Split type rotary bearing unit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention mainly relates to a rotary bearing unit used in a pinch roll supporting portion of a continuous casting facility.

[Conventional technology]

The pinch rolls used in continuous casting equipment are supported at both ends in addition to being supported at both ends due to the large load applied, but the bearings at the center support part are divided into two types due to assembly and rotation. Bearing units must be used.

Conventionally, this type of rotary bearing unit has an upper housing 11A of a housing which is divided into upper and lower parts as shown in FIG.
In the lower housing 11B, the inner ring 14C, the outer ring 14B, the rolling element 14A, and the fastening ring 15 (clamp ring) for fixing the inner ring 14C divided into two parts are also formed in the lower housing 11B. The fastening ring 15
And a labyrinth ring 21 divided into two is inserted between the upper and lower housings 11A and 11B. Further, in this rotary bearing unit, two grooves 16 and 17 are annularly provided on the outer surface of the fastening ring 15, and the groove 16
A string-shaped packing 30 made of asbestos is attached to the groove, and a groove 17 has a seal structure in which three iron rings 31 cut at one place are attached in an overlapped manner with the cut portions dispersed. In the rotary bearing unit having such a structure, new grease is constantly supplied from the outside to the place where the rolling elements 14A are arranged between the fastening rings 15 on both sides, while the grease whose lubricity is lost passes through the seal member at any time. It is designed to be discharged to the outside.

[Problems to be solved by the invention]

In the seal structure of the rotary bearing unit as described above, the conventionally used asbestos string packing 30 has excellent heat resistance, but has low strength, tends to be damaged early, and has low followability, so that it has a sealing effect. There is a difficulty, and even if a plurality of iron rings 31 that are cut at one place are stacked and mounted, the upper and lower housings 11A, 11A are rotated as the pinch roll 12 rotates.
The sliding part of B wears and the cutting part 31A is cut as shown in FIG.
Tend to open. Therefore, there is a problem that the gap at the ring cut portion becomes large and the sealing property deteriorates.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention provides a bearing having a structure in which a rolling element is arranged between a halved inner ring and an outer ring and the inner ring is integrally coupled by a fastening ring in a halved housing. In a two-part rotary bearing unit that is fitted to the housing and has a seal body that seals the bearing between the housing and the fastening ring, a packing groove and a seal groove are provided on the outer peripheral surface of the fastening ring. The seal body is made of a high-strength organic fiber and is fitted in the packing groove. The elastic packing is made of a high-strength organic fiber, and the elastic material composite has a lip portion having an outer radius slightly larger than the inner radius of the housing fitted in the seal groove. It is characterized by consisting of a lip seal.

[Action]

It is possible to provide a seal having excellent heat resistance and durability by fitting a lattice-woven elastic packing made of high-strength organic fiber into one packing groove of the two grooves formed on the outer peripheral surface of the fastening ring. In addition, since the packing has elasticity and the multiple lip seal fitted in the seal groove at another place is also mounted in an elastically deformed form, the sealing property is improved as a whole.

In addition, since the lip portion of the double lip seal is mounted outward, in particular, as in the conventional inward lip seal, a direction opposite to the tightening force, that is, an outward force is generated to open the cut portion of the seal. Since the force always acts in the closing direction of the cut portion of the seal, the sealing effect does not deteriorate over time.

〔Example〕

Specific embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of a split type bearing unit according to the present invention, and FIG. 2 is a partially enlarged view of a seal portion of this bearing unit. In these figures, 11 is a split housing, 11A is an upper housing of the split housing 11, and 11B is a lower housing. Reference numeral 12 is a pinch roll, and 14 is a bearing that supports the pinch roll 12 in a housing and is incorporated into the split type rotary bearing unit according to the present invention.
4A, 14A and outer ring 14B, 14B and inner ring 14C, 14
This is a self-aligning roller bearing composed of C and cages 14D and 14D. All of these are of the upper and lower halves, like the housing 11. 15 and 15 are inner rings 14C,
14C is a fastening ring (clamp ring) fixed around the outer peripheral end of 14C and having an outer diameter slightly smaller than the inner diameter of the housing 11. The fastening ring 15 is the outer ring 1
4B and the inner ring 14C, the inner ring 1 is provided with a slight gap so as to cover the side surface of the space where the roller 14A exists.
After being attached to 4C, the inner ring 14C is fixed.

Grease is supplied to the places where the rollers 14A, 14A are arranged between the fastening rings 15, 15 through a passage 31 provided at the center of the inner periphery of the upper and lower housings 11A, 11B and a passage 32 formed in the outer ring 14B. It is like this.
Further, the inner ring 1 is passed through the passage 35 formed in the inner ring 14C from the position where the rollers 14A and 14A are arranged.
The grease is also supplied to the contact surface between the 4C and the pinch roll 12.

Further, the packing groove 1 is formed on the outer peripheral surface 15A of the fastening ring 15.
6 and a seal groove 17 is provided inward of the packing groove 16 in the axial direction.

Next, 18 is a ring-shaped gland packing, and high-strength and elastic high-strength organic fibers (for example, aramid fibers) are woven in a lattice pattern and the surface thereof is made of PT
It is treated with a FE (polytetrafluoroethylene) resin liquid. Reference numeral 19 denotes a ring-shaped compound lip seal, which is made of an elastic material such as synthetic rubber and cut at one place.

Thus, the gland packing 18 is fitted in the packing groove 16 provided in the outer peripheral surface 15A of the fastening ring 15, and the multiple lip seal 19 having an outward lip is fitted in the seal groove 17. In this case, the gland packing 18
It is desirable to insert a gland packing in which the stitch direction is forward with respect to the rotation direction. That is, when the stitch direction of the gland packing is opposite to the rotation direction of the pinch roll 12, the fibers cut by abrasion during rotation stick out sideways and the overall shape collapses, impairing the sealability and lowering the durability. Because it does. Further, since the compound lip seal 19 is sealed in a state where it is elastically deformed by the resistance force to the inside of the housing 11A, the cut portion of the seal does not open with the rotation of the pinch roll 12, and the sealing effect does not deteriorate.

As another embodiment of the seal structure in the split type rotary bearing unit according to the present invention, as shown in FIG. 3, the gland packing 1 is provided in the packing groove 16 of the above embodiment.
It is also possible to insert 8 in the order of 18A of the order and 18B of the reverse order.

In this case, when fitting the gland packing 18 into the packing groove 16, it is not necessary to pay attention to whether it is the front side or the reverse side. Therefore, one gland packing is always attached on each side, so that it is good for a long time. Excellent sealing performance is obtained, and there is no imbalance in sealing performance and durability on both sides.

The details of the present invention have been described above, and the case where the present invention is used for the pinch roll supporting portion of the continuous casting equipment has been described as an example. However, the present invention is not limited to supporting pinch rolls of continuous casting equipment, and can be applied to the case of using such bearing units in other equipment.

[Effect of device]

As described above in detail, in this invention, as shown in FIGS. 1 to 3, in the split rotary bearing unit, the packing groove 16 and the seal groove 17 are provided in the outer peripheral surface 15A of the fastening ring 15. Then, a lattice-woven elastic packing 18 made of high-strength organic fiber is fitted in the packing groove 16, and an elastic material compound lip seal 19 having an outer radius slightly larger than the inner radius of the housing 11 is fitted in the seal groove 17.
Since it is characterized in that it is inserted, the sealing effect is improved and the life of the bearing portion and the entire rotary bearing unit is also improved.
Also, the maintenance period of the bearing unit is extended and the amount of replenishing lubricant can be reduced.

[Brief description of drawings]

FIG. 1 is a sectional view of a split type bearing unit according to the present invention, and FIG. 2 is a partially enlarged view of a seal portion of this bearing unit. FIG. 3 is another embodiment of the rotary bearing unit according to the present invention, FIG. 4 is an embodiment of a conventional split bearing unit, and FIG. 5 is an example of a conventional iron seal ring. Is. 14 ... Bearing, 15 ... Fastening ring 16 ... Packing groove, 17 ... Seal groove 18 ... Lattice elastic packing 19 ... Double lip seal

Claims (1)

[Scope of utility model registration request] 1. A bearing having a structure in which a rolling element is arranged between a halved inner ring and an outer ring and the inner ring is integrally coupled by a fastening ring is fitted in the halved housing and In a split rotary bearing unit having a seal body for sealing the bearing with the fastening ring, a packing groove and a seal groove are provided on an outer peripheral surface of the fastening ring, and the seal body is the packing. A lattice-woven elastic packing made of high-strength organic fiber fitted in the groove, and an elastic compound lip seal having a lip portion having an outer radius slightly larger than the inner radius of the housing fitted in the seal groove. A split bearing unit.