JP2000320550A - Double row tapered roller bearing - Google Patents

Abstract

(57) [Problem] To provide a double-row tapered roller bearing capable of easily obtaining an appropriate preload while adopting a relatively simple configuration. A double row tapered roller bearing (31) includes a pair of outer rings (1).
And an inner ring 3 having a double row raceway, and two rows of tapered rollers 5 interposed between the outer ring 1 and the inner ring 3. A plurality of spring engaging portions 7 are formed at the inner ends of both outer rings 1, and both outer rings 1 are urged in directions approaching each other by tension coil springs 9 bridged over these spring engaging portions 7. I have.

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, and more particularly to a technique for simplifying the structure and improving performance.

[0002]

2. Description of the Related Art In mechanical devices such as rolling mills and machine tools, rolls and spindles are rotatably supported.
Various rolling bearings are used. For example, as a thrust bearing for a roll neck of a rolling mill, a double-row tapered roller bearing in which tapered rollers as rolling elements are arranged in two rows facing each other is generally used. In the case of this type of double-row tapered roller bearing, the non-loaded side tapered roller that is in a no-load state may be damaged by so-called roller sliding generated between the bearing ring and the
A method of applying a preload between the inner and outer wheels by a biasing member such as a spring is employed.

For example, in a double row tapered roller bearing (conventional device 1) 31 shown in FIG. 3, a plurality of spring holding holes 25 are formed in inner surfaces of housings (bearing chocks) 21 and 23 holding the double row tapered roller bearing 31. And these spring holding holes 25
A compression coil spring 15 for urging both outer rings 1 inward is housed therein. Thereby, both outer rings 1, tapered rollers 5 and inner rings 3
And a predetermined preload is applied between the tapered rollers 5 on the non-load side.
Does not cause roller slip on the outer ring 1 or the inner ring 3. Further, in the double row tapered roller bearing (conventional device 2) 31 shown in FIG.
7 are mounted, and both outer rings 1 are attached to these spring holders 27.
Is housed therein.
Further, the double row tapered roller bearing (conventional device 3) 3 shown in FIG.
1, a spring holding hole 25 for accommodating the compression coil spring 15 is formed in the outer surfaces of both outer rings 1 themselves, and a spring falling-off prevention mechanism (not shown) is provided.

[0004]

As described below, the conventional double row tapered roller bearings 31 have problems in equipment cost and performance. First, in the double row tapered roller bearing 31 of the conventional apparatus 1, since it is necessary to form the spring holding holes 25 on the housings 21 and 23 side, it is inevitable that the equipment cost is increased due to an increase in the number of processing steps, and the inspection and inspection is also performed. There have been problems such as difficulty in assembling the compression coil spring 15 so as not to fall off during maintenance or the like. Conventional device 2
In the double-row tapered roller bearing 31, the problem raised in the conventional device 1 is eliminated, but the width of the outer ring 1 is reduced by the thickness of the spring holder 27, so that the bearing life can be restricted with a decrease in the rated load. Sex arises anew. Further, the double-row tapered roller bearing 31 of the conventional device 3 does not have the same problems as those of the conventional devices 1 and 2. However, since the spring holding holes 25 are formed, the strength of the outer race 1 is not affected. There is a need to. For this reason, the double row tapered roller bearing 31 which receives a thrust load is designed so that the outer ring 1 is not broken by circumferential tensile stress when the outer ring expands, for example, when the outer ring is loosely fitted. A need arises. On the other hand, in order to obtain an appropriate amount of preload with the conventional devices 1 to 3, it is necessary to accurately adjust the gap between the housings 21 and 23 and the outer ring 1 (indicated by t / 2 in FIG. 6). This is a factor that increases the burden on workers and installers. The present invention has been made in view of the above circumstances, and has as its object to provide a double-row tapered roller bearing that can easily obtain an appropriate preload while adopting a relatively simple configuration.

[0005]

According to the present invention, in order to solve the above-mentioned problems, an inner ring fitted to a rotating shaft, a plurality of outer rings fitted to a bearing housing, and a plurality of outer rings are provided between the inner ring and the outer ring. A double-row tapered roller bearing having a plurality of rows of tapered rollers interposed therebetween is proposed in which a biasing member for causing the outer rings to approach or separate from each other is interposed between the plurality of outer rings.

According to the present invention, for example, a compression coil spring or a tension coil spring is interposed between outer races, so that a desired amount of preload can be applied to a double row conical roller without performing a large process on the outer race or the housing. It can be set arbitrarily according to the form of the bearing.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a double-row tapered roller bearing according to a first embodiment of the present invention in a longitudinal section. As shown in the figure, the double row tapered roller bearing 31 of the first embodiment includes a pair of outer races 1, an inner race 3 having a double row raceway, two outer races 1 and an inner race 3 similarly to the above-described conventional device. And two rows of tapered rollers 5 interposed therebetween. In the case of the present embodiment, a plurality of spring engaging portions 7 are formed on the inner ends of both outer rings 1, and the outer rings 1 approach each other by a tension coil spring 9 bridged over these spring engaging portions 7. Biased in the direction.

In the double row tapered roller bearing 31 of the first embodiment, by adopting such a configuration, the spring is held on the outer ring 1 and the housing (not shown), which causes a decrease in strength and an increase in the number of processing steps. A preload can be applied between the outer ring 1, the tapered rollers 5, and the inner ring 3 without drilling holes. Further, in the present embodiment, the preload amount is uniquely determined by the distance between the two outer rings 1 and the specification (wire diameter, spring constant, etc.) of the tension coil spring 9, so that the axial gap between the outer ring 1 and the housing is strictly determined. No longer need to be set. Further, in the present embodiment, the number of springs for obtaining the same preload amount is only half that of the conventional device, so that the number of components can be significantly reduced. There is no danger of 9 falling off.

FIG. 2 is a longitudinal sectional view of a double row tapered roller bearing according to a second embodiment of the present invention. As shown in the drawing, the double-row tapered roller bearing 31 of the second embodiment differs from the above-described conventional device in that the tapered rollers 5 are combined outward. In the case of the present embodiment, the tapered rollers 5 are arranged between each pair of the outer races 1 having the single-row raceway and the inner race 3 without using the outer race having the double-row raceway often used in this embodiment. An annular spacer 13 in which a plurality of spring holding holes 11 are drilled is sandwiched between the two outer rings 1.
A compression coil spring 15 is fitted in each spring holding hole 11. The inner rings 3 are connected and integrated by an inner ring connecting ring 17. Incidentally, the reference numeral 19 in the drawing denotes the outer ring 1.
2 shows a rib extending from the outer end of the lip.

In the double row tapered roller bearing 31 of the second embodiment, similarly to the first embodiment, the outer ring 1 and the tapered roller 5 are formed without making a spring holding hole in the outer ring 1 or the housing. And a preload between the inner ring 3 and the inner ring 3. Further, it is not necessary to strictly set the axial gap between the outer race 1 and the housing, and it is also possible to reduce the number of springs and to prevent the compression coil spring 15 from dropping off at the time of inspection and maintenance in the same manner as in the first embodiment. did it. In the present embodiment, the inner rings 3 are connected by the inner ring connecting ring 17. However, if a method of tightening the end faces of the inner rings 3 when assembling the inner ring 3 and the shaft is adopted, the inner ring connecting ring 17 is omitted. It is possible to In this embodiment, the rib 1 is assumed to be incorporated in a housing for a conventional device.
The ribs 9 are provided on the outer race 1, but the ribs 19 can be omitted depending on the form of the housing.

The description of the specific embodiment has been completed.
The aspects of the present invention are not limited to these embodiments. For example, in the above embodiment, a tension coil spring or a compression coil spring is used as the urging member. However, a synthetic rubber or a synthetic resin having appropriate elasticity, such as a disc spring or a wave washer, may be used. Also, the specific shape and the like of each component member is not limited to the example in the above embodiment, and can be appropriately changed according to design convenience and the like.

[0012]

As is apparent from the above description, according to the present invention, the inner race fitted to the rotating shaft, the plurality of outer races fitted to the bearing housing, and the outer race between the inner race and the outer race. In a double-row tapered roller bearing having a plurality of rows of tapered rollers interposed, a biasing member that causes the outer rings to approach or separate from each other is interposed between the plurality of outer rings. By interposing a compression coil spring, a tension coil spring, or the like, a desired amount of preload can be arbitrarily set according to the form of the double-row tapered roller bearing without performing large processing on the outer ring or the housing. In addition, it is possible to prevent an increase in equipment cost and a decrease in outer ring strength.

[Brief description of the drawings]

FIG. 1 is a half longitudinal sectional view showing a double-row tapered roller bearing according to a first embodiment of the present invention.

FIG. 2 is a half longitudinal sectional view showing a double row tapered roller bearing according to a second embodiment of the present invention.

FIG. 3 is a half cut longitudinal sectional view showing a conventional double row tapered roller bearing.

FIG. 4 is a half cut longitudinal sectional view showing a conventional double row tapered roller bearing.

FIG. 5 is a half cut longitudinal sectional view showing a conventional double row tapered roller bearing.

FIG. 6 is an enlarged vertical sectional view showing a main part of a conventional double-row tapered roller bearing.

[Explanation of symbols]

 Reference Signs List 1 outer ring 3 inner ring 5 tapered roller 7 spring engaging part 9 tension coil spring 11 spring holding hole 13 spacer 15 compression coil spring 17 inner ring connecting ring 19 {Rib 31} Double row tapered roller bearing

Claims (1)

[Claims] 1. A double row comprising: an inner ring fitted externally to a rotating shaft; a plurality of outer rings fitted internally to a bearing housing; and a plurality of rows of tapered rollers interposed between the inner ring and the outer ring. In a tapered roller bearing, a double-row tapered roller bearing is characterized in that an urging member that causes the outer rings to approach or separate from each other is interposed between the plurality of outer rings.