JPH10184677A - Preload double row tapered roller bearing for receiving thrust load - Google Patents

Abstract

PROBLEM TO BE SOLVED: To apply a preload by a bearing itself by housing preload generating mechanisms due to spring force on the back sides of outer rings divided into two. SOLUTION: Preload generating mechanisms 5 are respectively housed in outer rings 1 divided into two, for example a housing hole 6 of desired depth is provided on the back 1a side of the outer ring 1 from the back 1a side toward the thrust direction, a piston 7 with flange is inserted therein, a coil spring 10 is arranged between a flange part 8 and the inner bottom face 6a of the housing hole 6, and the piston 7 is constituted so as to be movable in the thrust direction. The piston 7 is projectingly provided with a projection 9 on the back 7a side. The coil spring 10 can generate appropriate preload without shortening the fatigue life of a bearing at being pressed and enlarging friction moment or temperature rise. The housing holes 6 are provided by one or a plurality of pieces in the circumferential direction. Consequently at assembling, by pressing the projection 9 by a thrust receiving component, the preload is generated in the coil spring 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double-row tapered roller bearing used for receiving a thrust load of a rolling mill for steel.

[0002]

2. Description of the Related Art Double-row tapered roller bearings used for receiving the thrust load of a steel rolling mill with an inner ring integrated and an outer ring divided into two parts are sometimes used with an appropriate preload applied as a measure to prevent smearing. Many.

In a conventional method of applying a preload, for example, a preload mechanism 300 including a coil spring 400 and a mounting sliding bolt 500 is provided on a bearing part 200 around an outer ring 100 of a bearing. Some of them receive a preload generated from the preload mechanism 300 by the spring force of the coil spring 400 (FIG. 5). A preload mechanism 600 having a coil spring 800 built therein is installed inside the side plate 700 outside the outer ring 100 to receive a preload generated from the preload mechanism 600 by the spring force of the coil spring 800 (FIG. 6).

However, as in the above-mentioned prior art, the bearing component 20
In the case where the preload mechanism 300 is provided at 0, there is a problem that the number of bearing parts increases, and the shape becomes more complicated and larger. In the case where the preload mechanism 600 having the coil spring 800 built in is installed on the side plate 700, the net bearing width may be reduced, and the load capacity may be significantly reduced.

[0005]

The present inventor has conducted intensive research and experiments, and as a result, completed the present invention in order to eliminate the disadvantages of the prior art by incorporating a preload mechanism in the outer ring. It was just.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to provide a double row for receiving a thrust load in which an outer ring is subjected to only a thrust load having two divided outer rings. An object of the present invention is to provide a preload double-row tapered roller bearing for receiving a thrust load, which can apply a preload by itself without reducing the load capacity of the bearing, which is a tapered roller bearing.

[0007]

The technical means achieved by the present invention to achieve the above object is a double-row tapered roller bearing for receiving a thrust load in which the outer ring receives only a thrust load, which is divided into two parts. Thus, a preload generating mechanism by a spring force is built in the outer ring rear side of the bearing.

[0008]

When the bearing of the present invention is incorporated in a rolling mill by the above technical means, a preload generating mechanism built in the outer ring of the rolling mill housing is pressed from the rear side of the outer ring of the bearing by a thrust receiving part facing the outer ring of the rolling mill housing. And a preload is generated.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a preload double-row tapered roller bearing for receiving a thrust load according to the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show a first embodiment of the present invention, and FIGS.
Shows the second embodiment, respectively, and in each of the drawings,
3 shows a double-row tapered roller bearing of an outer ring split type. In the drawings, reference numerals 1 and 1 denote outer rings, 2 denotes inner rings, 3 denotes tapered rollers (front combination), 4 denotes a retainer, and 5 denotes a preload generating mechanism. In the present embodiment, the inner ring 2, the tapered rollers 3, and the retainer 4 have a well-known structure, and a description thereof will be omitted.

The preload generating mechanism 5 is incorporated in each of the outer races 1, 1, for example, on the back 1 a side of the outer race 1.
A built-in hole 6 having a desired depth is provided inward from the side (in the thrust direction), a flanged piston 7 is inserted into the built-in hole 6, and a flange portion 8 of the piston 7 and the built-in hole 6 are formed. The piston 7 is configured to be movable in the thrust direction by disposing a coil spring 10 between the piston 7 and the inner bottom surface 6a.

The piston 7 has a flange 8 for receiving one end of a coil spring 10 and a projection 9 protruding from the back surface 7a. In the drawings, the projection 9 is formed in a fine shaft shape, but its shape, length, etc. are arbitrary and are not limited at all.

The coil spring 10 is not particularly limited in its shape and the like, but it does not shorten the fatigue life of the bearing when pressing the thrust receiving part facing the outer ring of the rolling mill housing, and also increases the friction moment and temperature rise. An appropriate preload can be generated without any preload.

In this embodiment, the coil spring 10 is used to generate the preload as described above. However, the present invention is not limited to this as long as it is an elastic member that can generate an appropriate preload. Modifications such as a leaf spring and a disc spring within the scope of the present invention are free.

As described above, one or more internal holes 6 are provided in the circumferential direction on the outer ring rear surface 1a side, and the number of the internal holes 6 is set to a number suitable for applying an appropriate preload, and The shape is arbitrary, such as circular, rectangular, and elliptical. Therefore, the number and shape of the pistons 7 and the coil springs 10 are selectively changed according to the internal holes 6.

In addition, the internal hole may not be formed as a single hole as described above, but may be provided in a series of grooves on the back surface 1a side of the outer ring 1 in the circumferential direction. In this case, it is configured such that the coil spring 10 does not escape in the circumferential direction at the time of the pressing operation by the thrust receiving part facing the outer ring of the rolling mill housing (not shown). For example, although not shown, the left and right wall surfaces are respectively erected at the built-in holes of the groove-shaped built-in holes to cover the respective coil springs, so that each coil spring escapes in the groove direction (circumferential direction). To prevent or provide a fitting groove on the wall surface where the coil spring is built in, a fitting piece matching the fitting groove is protruded on the outer periphery of the piston, and the fitting piece slides along the fitting groove. This prevents the coil spring from escaping in the groove direction (circumferential direction).

In the drawing, reference numeral 11 denotes a retaining ring attached for preventing the piston 7 from coming off.

Therefore, when the above-described bearing is incorporated in a rolling mill, the projection 9 protruding from the rear surface 7a of each piston 7 is provided by a thrust receiving part (not shown) facing the outer ring of the rolling mill housing. As a result, the coil spring 10 disposed between the piston 7 and the inner bottom surface 6a of the internal hole 6 is pressed against its resilient force, thereby generating a preload.

FIGS. 3 and 4 show a second embodiment of the present invention, in which an O-ring 1 is attached to a piston 7 constituting the bearing of the first embodiment.
2 to prevent foreign substances such as metal pieces, dust, and water from entering the coil spring 10 side. Therefore, the smooth operation of the piston 7 can be achieved by preventing the foreign matter from entering.

The other components such as the built-in hole 6, the piston 7, the coil spring 10, and the like are the same as those in the first embodiment.

[0021]

As described above, according to the present invention, since a preload generating mechanism using a spring force is incorporated on the back side of the outer ring of the bearing, parts other than the bearing are not required for achieving a constant pressure preload. This eliminates the disadvantages of increasing the number of parts of the shaft box and increasing the dimensions around the bearing as in the related art, so that the number of parts of the shaft box can be reduced and the parts of the shaft box can be simplified. The shape is simplified and reduced.

Further, there is no need for a preload mechanism in which a spring is incorporated in the side plate as in the prior art, and the preload can be applied by the bearing itself, so that the net bearing width does not decrease and the load capacity does not largely decrease. . The present invention can be applied to devices other than double-row tapered roller bearings of rolling mills, as long as the devices and bearings require preload in the axial direction. Examples of other devices include thrust bearings such as reduction gears, and other types of bearings include tapered roller bearings other than double row, cylindrical thrust roller bearings, and thrust self-aligning roller bearings. The shape can be simplified and reduced in size.

[Brief description of the drawings]

FIG. 1 is a vertical sectional front view showing an embodiment of the present invention.

FIG. 2 is an enlarged vertical sectional front view of a main part.

FIG. 3 is a longitudinal sectional front view showing another embodiment of the present invention.

FIG. 4 is an enlarged vertical sectional front view of a main part.

FIG. 5 is a longitudinal sectional front view showing a conventional technique.

FIG. 6 is a vertical sectional front view showing another conventional technique.

[Explanation of symbols]

 1: Outer ring 1a: Back side 2: Inner ring 5: Preload generating mechanism 6: Built-in hole 7: Piston 10: Coil spring

Claims (1)

[Claims] 1. A double-row tapered roller bearing for receiving a thrust load, wherein the outer ring receives only a thrust load divided into two parts, wherein a preload generating mechanism by a spring force is incorporated on the back side of the outer ring of the bearing. Preload double row tapered roller bearings for receiving thrust loads.