JP6031833B2 - Vertical double row rolling bearing - Google Patents

Description

  The present invention is a double row rolling bearing used in a shaft, and more specifically, the lubricant held in the upper rolling element row by the rolling element cage flows down to the lower rolling element row by its own weight and centrifugal force. The present invention relates to a vertical double row type rolling bearing that prevents the above-described problem.

  A vertical multi-row rolling bearing applied to a steel roll for steel rolling mills has a lubricant (grease) that lubricates the upper rolling element row of the rolling element row aligned in the upper and lower double rows. May flow down to the lower rolling element row, resulting in insufficient lubrication of the upper rolling element row. As a rolling bearing that solves such a problem of lubricant flow, a flange portion is integrally formed on the outer diameter surface of the rolling element cage, and a lubricant holding space for the upper rolling element row and the lower rolling element row is formed by this flange portion. There is a rolling bearing designed to partition (see Patent Document 1).

  A specific example is shown in FIG. 4, which is a tapered roller bearing on the inner ring 2 fitted to the roll neck 1 ′ of the shaft 1, which is a saddle roll for a steel rolling mill, and the outer diameter surface of the inner ring 2. It has tapered roller rolling elements 3 and 4 arranged in two upper and lower stages, retainers 5 and 6 for holding the upper and lower rolling elements 3 and 4, and an outer ring portion 7. The outer ring portion 7 is composed of outer rings 8 and 9 divided into upper and lower two stages and an annular outer ring positioning spacer 10 interposed between the upper and lower outer rings 8 and 9, and the entire bearing is stored in the housing member 11. Is done. The bearing internal space has lubricant holding spaces of the upper rolling element row N1 and the lower rolling element row N2, and the lubricant (not shown) is held in the bearing inner space so as to be replenished and discharged.

  In the inner ring large collar portion 2a in the middle row portion N3 between the upper rolling element row N1 composed of the upper rolling element 3 and the cage 5, and the lower rolling element row N2 composed of the lower rolling element 4 and the cage 6. The tapered end surfaces of the rolling elements 3 and 4 come into contact with or approach each other. Annular flange portions 5b and 6b are integrally formed on the outer diameter side of the end portions 5a and 6a of the cages 5 and 6 located in the inner ring large collar portion 2a. 4, the ribs 5d and 6d at the tips of the annular flange portions 5b and 6b cover the inner diameter surface of the spacer 10 and are predetermined on the inner diameter surface of the spacer 10 as shown in FIG. The labyrinth seal is constructed by approaching with a small clearance S. The annular flange portions 5b and 6b partition and separate the lubricant holding space of the upper rolling element row N1 and the lower rolling element row N2, and suppress the flow of the lubricant from the upper rolling element row N1 to the lower rolling element row N2.

JP 2005-76724 A

  To prevent the lubricant from flowing from the lubricant holding space of the upper rolling element row N1 to the lubricant holding space of the lower rolling element row N2, the rib portion 5d at the tip of the flange portion 5b of the upper cage 5, the outer ring spacer 10 and The smaller the clearance S, the more effective. However, in consideration of the radial movement of the cage 5 and the amount of depression of the outer ring spacer 10 (clearance with the housing 11), it is difficult to make the clearance S extremely small. Therefore, as indicated by the arrow in FIG. 4, the lubricant in the upper rolling element row N1 is blown off by the centrifugal force by the bearing rotation, and the inner diameter surface of the spacer 10 from the gap between the inner diameter surface of the outer ring 8 and the rib portion 5d of the cage. May enter the clearance S, flow down from the clearance S to the lubricant holding space of the lower rolling element row N2, and insufficient lubrication may occur in the upper rolling element row N1. Furthermore, in order to secure the predetermined gap S, it is necessary to further increase the processing accuracy of the cage, which has been a factor in raising the manufacturing cost of the cage. Accordingly, an object of the present invention is to provide a vertical double row rolling bearing that has an improved effect of preventing the lubricant from flowing between the upper and lower rolling element rows without increasing the cost of the rolling element cage.

A first invention for solving the above problems includes an inner ring having a plurality of rolling grooves formed on an outer peripheral surface, an outer ring having a plurality of rolling grooves formed on an inner peripheral surface, and a rolling groove of the inner ring. In a vertical double-row rolling bearing comprising a plurality of rolling elements disposed between the outer ring and a rolling groove of the outer ring, and a plurality of cages that hold the rolling elements at equal intervals in the bearing circumferential direction. An annular flange member is provided at a position facing each open end of the upper rolling element cage and the lower rolling element cage, and the annular flange member has a claw-like engaging portion, an annular portion, and a cylindrical shape. A groove-like engaged portion is provided on the outer peripheral surface of the inner ring, the engaging portion and the engaged portion are engaged with each other, and a plurality of the annular flange members are provided. Each of the annular flange members is arranged so that the cylindrical portion of each of the annular flange members faces upward in the axial direction. And characterized in that arranged in opposite positions to each open end of the Danten body retainer and retainer for each said lower rolling elements.

In the second invention, the engaged portion is provided in the inner ring, and the flange member is press-fitted into the inner ring and then crimped to perform the engagement corresponding to the engaged portion. A portion is formed .

  According to the present invention, since the annular flange member, which is a separate member, is press-fitted and fixed to the outer diameter of the bearing inner ring so as to face the cage opening end, the lubricant is prevented from falling, so that the cage does not use a special shape, Conventional shapes such as those used for horizontal rolling bearings can be used. Thereby, the cost increase of the cage and the saddle type double row type rolling bearing can be prevented. Further, since the flange member is provided at a position facing the end portion of the cage opening, there is no need for a space for preventing the lubricant from flowing down, thereby contributing to space saving.

It is sectional drawing which shows the vertical type double row type rolling bearing of embodiment of this invention. It is A section explanatory drawing of the vertical double row type rolling bearing which concerns on Embodiment 1 of this invention. It is A section explanatory drawing of the vertical double row type rolling bearing which concerns on Embodiment 2 of this invention. It is a figure which shows the conventional vertical double row type rolling bearing. It is an enlarged view of a cage and outer ring spacer periphery of a conventional vertical double row type rolling bearing.

[Embodiment 1]
Hereinafter, embodiments of the present invention will be described.
As shown in FIG. 1, the vertical double row conical rolling bearing of the present embodiment includes a plurality of inner rings 21 provided with double row rolling grooves 21a on the outer peripheral surface and rolling grooves 22a provided on the inner peripheral surface. The outer ring 22, a spacer 26 for positioning the outer ring 22 at a predetermined position corresponding to the rolling groove 21a of the plurality of outer rings 22 and the rolling groove 21a of the inner ring 21, and each rolling of the outer ring and the inner ring. A plurality of rolling elements 23 that roll at positions corresponding to the grooves 21a and 22a, and a plurality of cages 24 that hold the double row rolling elements 23 at equal intervals in the circumferential direction of the rolling grooves are provided. The retainer 24 is formed by pressing a metal plate in the same manner as that used in a conventional bearing disposed in a horizontal shape. One end of the cage 24 is bent to form a bent portion 24a, is opposed to cover the end face 23a of the rolling element 23, and the other end is an open end with respect to the rolling element end face 23a.

  In order to cause the bearing 30 to roll smoothly, a lubricant (not shown) is filled in the space between the inner ring and the outer ring that accommodates the rolling elements 23. For this reason, when the bearing 30 is used in a saddle shape, the lubricant flows downward from the open end of the cage 24 due to its own weight, and the lubricant is sequentially depleted from the upper row of rolling elements. In order to prevent this, an annular flange member 25 having an L-shaped cross section is press-fitted and fixed to the inner ring 21 so as to face the cage open end, thereby suppressing the flow of the lubricant.

As shown in the partially enlarged view of FIG. 2, in order to securely fix the flange member 25 to the inner ring 21, in addition to press-fitting, the flange member 25 has a claw-like engagement portion 27a and the outer peripheral surface of the inner ring 21 has a groove-like covering. engagement portion 27 b is provided respectively, it may be the the engagement 27a and the engaged portion 27b is engaged with each other. Further, an engaged portion 27b is provided in the inner ring, and the flange member 25 is press-fitted into the inner ring 21 and then crimped, and the engaged portion 27a corresponding to the engaged portion 27b is formed and fixed on the flange member. You may be sure.

[Embodiment 2]
As shown in FIG. 3, in the vertical double row conical rolling bearing of this embodiment, the annular flange member includes an annular portion 25a, a cylindrical portion 25b, and a claw-like engaging portion 27a, and the cylindrical portion 25b. Is upward in the axial direction. Although not shown, the two flange members 25 in FIG. 1 are different from those in the first embodiment in that the cylindrical portion 25b is upward as shown in FIG. The saddle type double row conical rolling bearing is installed with scissors, and the annular portion 25a of the flange member 25 may be bent downward and deformed by its own weight. For the above-described embodiment 1 (FIG. 2), with the deformation of the annular portion 25a, the cylindrical portion 2 5 b is deformed opening of the cylinder is unfolded, the claw-like engaging portion 27a of the inner ring to be there is a possibility that peeling from the engaging portion 27 b. Accordingly, in this embodiment, in order to prevent the claw-like engaging portion 27a is detached from the engaged portion 27 b of the inner ring, the orientation of the cylindrical portion 2 5 b upward. Annular portion 25a is also deformed by bending downwards by its own weight, since the cylindrical portion 2 5 b is upwardly deformed opening of the cylinder is narrowed, the engagement portion of the claw-like engaging portion 27a and the inner ring 27 The engagement of b becomes even tighter.

  In the above description of the first and second embodiments, the vertical double row conical rolling bearing has been described as an example. However, the present invention is not limited to this, and can be applied to a cylindrical rolling bearing.

  By adopting the structure as described above, it is possible to prevent the bearing lubricant from being defective while suppressing an increase in the cost of the cage. Furthermore, since the arrangement space of the member for preventing the lubricant from flowing down is unnecessary, it can contribute to space saving.

1 竪 shaft 21 inner ring 22 outer ring 23 rolling element 24 cage 25 flange member 25a annular part 25b cylindrical part 26 spacer 27a engaging part 27b engaged part 30 bearing

Claims (2)

An inner ring having a plurality of rolling grooves formed on the outer peripheral surface, an outer ring having a plurality of rolling grooves formed on the inner peripheral surface, and the inner ring and the outer ring. In a vertical double row rolling bearing comprising a plurality of rolling elements and a plurality of cages that hold the rolling elements at equal intervals in the circumferential direction of the bearing, the upper rolling element retainer and the lower rolling element retainer An annular flange member is provided at a position facing each open end of the vessel ,
The annular flange member is provided with a claw-like engaging portion, an annular portion, and a cylindrical portion, and a groove-like engaged portion is provided on the outer peripheral surface of the inner ring, and the engaging portion and the covered portion are provided. The engaging portions are engaged with each other,
Further, the annular flange members are provided in a plurality, and the annular flange members are respectively connected to the upper rolling element cages and the lower rolling element cages so that the cylindrical portions of the annular flange members face upward in the axial direction. A vertical double row type rolling bearing characterized in that it is arranged at a position facing each open end . The engaged portion is provided in the inner ring, and the engaging portion corresponding to the engaged portion is formed by crimping after the flange member is press-fitted into the inner ring. A method for manufacturing a vertical double row rolling bearing according to claim 1.

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