JP2500003Y2 - Unidirectional high load capacity asymmetric thrust bearing - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an axially fixed thrust bearing used in a rolling mill or the like for manufacturing various rolled steel materials, and more particularly to an asymmetrical thrust bearing having a high unidirectional load capacity.

[0002]

2. Description of the Related Art A radial bearing and a thrust bearing are often used in combination as appropriate for a bearing of a steel strip rolling mill, a shaped steel rolling mill or the like according to a load condition. Generally, a thrust bearing for supporting an axial load is used. Bearings are roughly classified into the following two types.

(1) A type that can be fixed in one direction (hereinafter referred to as A
Model)). (2) A type that can be fixed in both directions (hereinafter referred to as B type). When the shaft is fixed using an A type thrust bearing that can be fixed in one direction, it is generally used when the shaft is in the vertical direction and a downward load is exclusively applied. On the other hand, when there is a shaft in the horizontal direction, a thrust bearing and a radial bearing may be combined or preloaded by using a thrust bearing that can be loaded in the radial direction. B that can be fixed in both directions
When fixing with a model of thrust bearing,
It can be used both vertically and horizontally by combining with other radial bearings.

In the case of A type thrust bearings,
If the shaft is arranged in the vertical direction and only a downward load is applied, one thrust bearing will suffice, which is compact and advantageous. However, when the shaft is arranged in the horizontal direction, or when the shaft is arranged in the vertical direction and a load is applied in the vertical direction, a radial bearing is required in addition to the two thrust bearings, which becomes complicated. In such a case, if a B type thrust bearing that can support the thrust force acting on either side in the axial direction is used, only one bearing is required, so that the bearing can be made compact.

For example, various steel rolling mills such as large rolling mills and cold strip rolling mills are used in combination with thrust bearings and radial bearings, and the combinations thereof vary depending on the magnitude of thrust load and radial load. is there. Thrust bearings can be used in various ways depending on the thrust load. For example, a universal rolling mill for shaped steel that rolls by combining horizontal rolls and vertical rolls has a large thrust load, so B type thrust bearings should be used for compactness. I am trying.

Among the H-shaped steels, H-shaped steel is generally rolled as shown in FIG.
As shown in FIG. 3, a universal rolling machine is used in which a pair of upper and lower horizontal rolls 40 and 40 'and a pair of left and right vertical rolls 7 and 7'are incorporated in the same stand. When manufacturing the H-section steel 1 by such a rolling mill, the thrust load acting on the rolls of the universal rolling mill is only the unbalanced portion during rolling. The flange width can be freely changed as long as it is within the range of the roll cylinder length of the vertical roll, but the web height h is h = W + 2t _1, that is, the flange thickness t ₁
And the roll cylinder length W of the horizontal rolls 40, 40 ', the roll width of the horizontal rolls 40, 40', i.e., when the roll width is fixed, causes the following problems. It was requested to be variable.

A) Since the inner surface of the flange is rolled by the end surface of the horizontal roll, the end surface of the horizontal roll is greatly worn. Even within the same rolling opportunity, the web height becomes insufficient due to an increase in the rolling amount, and a product of a certain size is produced. It was not possible to obtain it in a stable manner, and frequent replacement of the rolls was necessary to avoid this. B) Only one size of web height can be selected per roll.

C) Web height of H-section steel (web outer width) h
In the so-called outer constant H-section steel with a constant value, there are many types of flange thickness (t ₁ ) even with the same nominal size (for example, H 6
00 × 200 is 12 to 28 mm), and the rolling width (W) of the horizontal roll needs to be appropriately changed according to the flange thickness. In order to deal with this, it is necessary to frequently replace the rolls, which hinders the productivity, and it is necessary to maintain a large number of replacement man-hours and a large number of rolls.

D) Since the rolling width (W) is frequently processed to match the inner dimension (W ₁ ) of the H-shaped steel in order to improve the dimensional accuracy, the roll unit becomes high. As an advantageous variable width rolling roll that does not cause such a problem, a structure having a structure as shown in FIG. 5 has been developed in recent years. However, with such a variable width rolling roll, the total thrust load during rolling is reduced. It is loaded with a B type thrust bearing.

FIG. 5 shows the variable width rolling roll 2'in cross section. The roll cylinder that controls the reduction of the web portion and the inner surface of the flange of the H-shaped steel 1 has a two-part structure of a drive-side roll cylinder 9a and an operation-side roll cylinder 9b, and the roll shaft 10a of the drive-side roll cylinder 9a has a radial bearing 11a. Supported on the drive side roll chock 3 via the
The roll shaft 10b is supported by the operation side roll chock 4 via the radial bearing 12. The drive-side and operation-side roll chocks 3 and 4 are supported by a housing (not shown). The drive-side roll shaft 10a is connected to a drive device (not shown) via a spindle coupling 5 at the drive-side shaft end, and the torque required for rolling is transmitted from this drive device.

Further, the roll extension shaft of the drive side roll shaft 10a is penetrated through the hollow neck portion of the roll shaft 10b of the operation side roll cylinder 9b so that the roll shaft can be inserted / removed in the roll axial direction and the rolling torque is transmitted so that they can be synchronously rotated. In the figure, the sliding key K
The case where the torque from the drive-side roll shaft is transmitted to the operation-side roll shaft via the is illustrated. Rolling width changing devices for relatively moving the roll shafts 10a and 10b on the drive side and the operation side are relatively provided on the operation side shaft ends. This rolling width changing device has the following structure.

First, a thrust bearing 13 for receiving a thrust load at the time of rolling is fitted to the end portion of the operation side roll shaft 10b, and the operation side slide block 14 is mounted via the thrust bearing 13. The operation side slide block 14 is provided with a screw that fits into a width adjusting nut 22 described later. Further, in order to restrain the rotation of the operation side slide block 14 and allow only the sliding in the roll axial direction, the operation side slide block 14 is fitted with a fixed block 15 connected to the operation side roll chock 4 with a key or a spline.

On the other hand, a connecting bolt 16 is detachably connected to the end portion of the drive side roll shaft 10a in the axial extension direction, and a connecting block 17 is connected to the connecting bolt 16 so as to rotate coaxially in a synchronous manner. The block 17 is fitted with a thrust bearing 18 for receiving a thrust load during rolling and a radial bearing 19 for receiving a radial load, and the drive side slide block 20 is mounted through the thrust bearing 18 and the radial bearing 19. . The drive-side slide block 20 is provided with a screw that fits in a width adjusting nut 22 described later and has the same screw pitch as that of the above-mentioned operation-side slide block 20 but has a different thread cutting direction.
Further, a rotation stopper 21 is provided in order to restrain the rotation of the drive side slide block 20 and allow only sliding in the roll axis direction.

The operation side slide block 14 and the drive side slide block 20 described above are screwed to a width adjusting nut 22 provided with a screw that fits with the screw provided on these. A gear 23 and a pinion are attached to the outer circumference of one end surface of the width adjusting nut 22.
A width adjustment drive device 26 including a motor 24 and a motor 25 is provided.
It should be noted that one end surface of the driving side roll shaft 10a is a spherical surface r, and a spring 27 is inserted between the connecting bolt 16 and the connecting block 17 to apply a constant force to the connecting block 17 and the driving side roll shaft 10a. 10a and the spherical surface r are kept in contact with each other.

Further, since the roll is a variable width roll, a gap is formed between the drive-side roll cylinder 9a and the operation-side roll cylinder 9b, and scale or water enters, so that a scale seal is provided between the rolls.
28 are provided. Next, the rolling width changing operation will be described. In order to change the roll cylinder length W shown in FIG. 5, first, when the motor 25 is operated, the pinion 24 and the gear 23 meshing with the pinion 24 rotate, and the width adjusting nut 22 rotates in the operation side roll chock 4. Since the width adjusting nut 22 is restrained from moving in the roll width direction by the fixing block 15 fixed to the operation side roll chock 4 and the pressing plate 29,
The operation-side and drive-side slide blocks 14 and 20, which are screw-coupled to the width adjusting nut 22 with the same pitch but different threading directions, relatively move in the roll axis direction. Therefore, the operation side slide block 14 is provided with the thrust bearing 13 and the operation side roll shaft 10b and the operation side roll cylinder 9
connected to b, and drive side slide block 20
Is connected to the drive-side roll cylinder 9a via the thrust bearing 18 and the radial bearing 19, the connection block 17, the connection bolt 16 and the drive-side roll shaft 10a, so that the roll cylinder length W (rolling width) can be freely adjusted. be able to. The screws provided on the inner surface of the width adjusting nut 22 are usually screws in opposite directions, the pitches of the screws are the same, and the movement amounts of the drive-side roll cylinder 9a and the operation-side roll cylinder 9b are the same.

A thrust bearing 13 installed between the operating roll shaft 10a and the operating slide block 14
As shown in FIG. 4, the roller 32 is mainly composed of an inner race 31, a large number of rollers 32 arranged on both sides of the inner race 31, and an outer race 33 arranged outside thereof.
As the outer race 32, a general left-right symmetrical type is used in terms of production and use. Such a symmetrical thrust bearing 13 is fixed to the outer circumference of the shaft end portion of the operation side roll shaft 10b by a nut 35a via a fitting collar 34, and on the inner circumference of the operation side slide block 14 by a nut 35b. It is fixed. 36 is color,
37 indicates a sealing material.

[0017]

In FIG. 5, the H-section steel 1 has a rolling force when the left and right flanges are rolled by a pair of upper and lower horizontal rolls 2 and 2'and a pair of left and right vertical rolls 7 and 7 '. Will act on the side surfaces of the driving-side roll cylinder 9a and the operating-side roll cylinder 9b that face each other with a gap. Even if such a rolling action is applied, the drive-side roll cylinder 9a has no mechanism for moving and is fixed in the axial direction so as to be firmly fixed to the drive-side roll shaft 10a, so that there is no problem even if a thrust load is applied. There is no.

However, the total thrust load applied from the vertical roll 7'through the flange portion of the H-shaped steel 1 to the operating-side roll cylinder 9b during rolling is applied to the left-right symmetrical thrust bearing 13 via the operating-side roll shaft 10b. It only works in one direction. However, when using a symmetrical B-type bearing that only applies a small thrust load in the opposite direction, it is necessary to design a bearing that matches the large load side, so the anti-load side has a larger load capacity than necessary. In addition, the external dimensions of the bearing are unnecessarily large, resulting in a lack of compactness.

The present invention has been made in view of the above circumstances, and is used under a thrust load condition in which a large thrust load acts only in one direction and a small thrust load acts in the opposite direction. The present invention provides a one-way high load capacity asymmetrical thrust bearing suitable for.

[0020]

According to the present invention, in a thrust bearing for axially fixing a rotating body, a rolling element having a high load capacity and an outer race are arranged on one side of an inner race provided in a central portion of the thrust bearing. A one-way high load capacity asymmetric thrust bearing, wherein a rolling element having a low load capacity and an outer race are disposed on the other side of the inner race. In addition,
Slide metal can be used instead of rolling elements and outer races with low load capacity

[0021]

[Operation] In the present invention, a small rolling element having a low load capacity and an outer race or a slide metal are arranged on the other side where only a small thrust load is applied. It is possible to increase the volume of the moving body. Therefore, a rational structure with improved strength on the one-way high load side can be obtained, and strength against a one-way thrust under a high load can be improved as compared with the case where the external dimensions are the same as those of the conventional symmetrical thrust bearing.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An asymmetric thrust bearing in the case where the unidirectional high load capacity asymmetric thrust bearing of the present invention is applied to a variable width horizontal roll of a universal rolling mill for H-section steel will be described below with reference to the drawings. FIG. 1 shows an embodiment of the present invention. The same parts as those of the conventional example shown in FIG. 4 are designated by the same reference numerals to simplify the description.

As shown in FIG. 1, in the present invention, as described with reference to FIG. 5, the vertical roll 7'is being rolled.
To the variable width rolling roll 40 through the flange of H-section steel 1
The operation side roll cylinder 9b and the operation side roll shaft 10b in this order apply a high unidirectional thrust load to the asymmetric thrust bearing 40 in the direction of thrust load larger than the inner race 31 of the conventional example shown in FIG. Outer race 33A as well as race 31A and large diameter roller 32A
Also increase the thickness. Further, a roller 32B having a small diameter and an outer race 33B having a small thickness are arranged on the opposite side where only a small thrust load is applied.

With such a structure, the thrust load acting on the operating-side roll cylinder 9b by the vertical roll 7'through the flange portion of the H-shaped steel 1 passes through the operating-side roll shaft 10b, and the asymmetric thrust bearing. Loaded at 40. The large thrust load applied to the thrust bearing 40 in this manner is transmitted through the inner race 31A, the roller 32A and the outer race 33A to the operation side slide block.
It will be supported by the nut 35b attached to 14.

As described above, the thickness of the inner race 31A and the outer race 33A in the thrust direction is made large and the diameter of the roller 32A is made larger than before, so that the load applied per unit volume should be made smaller. As a result, it is possible to withstand a high thrust load. In this way, the one-way high load capacity can be achieved by the roller 32B on the opposite side on which only small thrust load acts
This is because the diameter of the outer race 33B is made smaller and the thickness of the outer race 33B is made much smaller than the conventional one.

FIG. 3 shows the relationship between the thickness of the inner race and the stress acting on the inner race due to the unidirectional thrust load caused by the rolling force of the vertical rolls. By reducing the size of 32B and outer race 33B, it is possible to increase the thickness of symmetrical thrust bearings with the same outer diameter from 32mm to 55mm, and the stress acting per unit area is 30kg / mm.
It can be reduced from ² to 10 kg / mm ² and its strength can be improved at least about 2.5 times. As a result, the life of the thrust bearing has been extended and it has become possible to continue operation without replacing the thrust bearing for more than 6 months.

In particular, when the thrust capacity on the anti-load side is small, the slide metal 39 may be arranged on the side on which only a small thrust load is applied as shown in FIG. Can be miniaturized, and similar operations and effects can be obtained.

[0028]

As described above, since the asymmetric thrust bearing of the present invention has a high load capacity in one direction, it can be used in one direction like a horizontal roll with a variable width of a universal rolling mill for manufacturing H-section steel. If it is applied to a bearing part where only a high thrust load acts and only a small thrust load acts in the opposite direction, the structure can be kept compact and the life can be dramatically improved compared to the conventional symmetrical thrust bearing. .

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional view showing another embodiment of the present invention.

FIG. 3 is a graph showing the relationship between the thickness of inner race and stress.

FIG. 4 is a cross-sectional view showing a conventional example.

FIG. 5 is a cross-sectional view of a universal rolling mill provided with variable width rolling rolls.

FIG. 6 is an explanatory diagram of rolling of H-section steel by a universal rolling mill.

[Explanation of symbols]

 1 H-section steel 2, 2'Variable width rolling roll 3, 3'Drive side roll chock 4, 4'Operating side roll chock 9a Driving side roll cylinder 9b Operating side roll cylinder 10a Driving side roll shaft 10b Operating side roll shaft 11,12 Radial Bearing 13 Thrust bearing 14 Operating side slide block 31A Inner race 32A Large diameter roller 32B Small diameter roller 33A Large outer race 33B Small thickness outer race 34 Color 35a, 35b Nut 40 Asymmetric thrust bearing

Continued Front Page (72) Hideo Baba Inventor Hideo Baba 1-chome, Mizushima Kawasaki-dori, Kurashiki-shi, Okayama (No house number) Kawasaki Steel Co., Ltd. Inside Mizushima Works (56) Reference JP-A-4-33709 (JP, A) Flat 4-33709 (JP, Y2)

Claims (2)

(57) [Scope of utility model registration request] 1. A thrust bearing for axially fixing a rotating body, wherein a rolling element having a high load capacity and an outer race are arranged on one side of an inner race provided at a central portion of the thrust bearing, and the other side of the inner race is provided. A one-way high load capacity asymmetric thrust bearing characterized in that a rolling element having a low load capacity and an outer race are disposed on the side. 2. The asymmetric thrust bearing of one-way high load capacity according to claim 1, wherein a slide metal is arranged instead of the rolling element having a low load capacity.