JP2001208073A - Tapered roller bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tapered roller bearing with tapered rollers being built-in which makes possible accurate measurements of contour, a diameter and others of a rolling contact surface of a roller. SOLUTION: A roller 1 is provided with, on both sides, of a barrel, a heat end face 12 of spherical surface of low curvature and a tail end face 11 of flat surface, and has a conical rolling contact surface 13 on a side face between both end face 11 and 12. At the center area of the head end face 12, a concave 20 is formed. The concave 20 is shaped as two step configuration, and a shallow depth 22 of larger diameter of which is formed by accurate grinding with end mill of the periphery of the recess produced at the time of machining of the roller 1 with header. A bottom face 22a of the shallow depth 22 is serving as a plane of reference perpendicular to an axis CX of the roller 1, and a side face 22b of the shallow depth 22 is forming a cylindrical plane of reference having equal distances from the axis CX of the roller 1. By using the bottom face 22a and others, the contour or the diameter of the rolling contact surface 13 can be measured accurately during the intermediate process of manufacturing of the roller 1, the assembling process of the tapered roller bearing and other processes.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tapered roller bearing incorporating a tapered roller.

[0002]

2. Description of the Related Art For a tapered roller to be incorporated in a tapered roller bearing, a roller rolling surface is required during a manufacturing process or a bearing assembling process of disposing the tapered roller between inner and outer rings. Precise measurement of the shape, diameter, etc. is required.

[0003] In such a measurement, for example, the end face of the tapered roller (that is, the head) is used as a reference for measurement. This head is usually processed into a spherical surface, and a concave portion called a relief is formed in the center. Is formed. This recess is formed during header processing performed early in the manufacture of the tapered rollers and is not exactly located at the center of the axis of the tapered rollers. Therefore, if the position of such a concave portion is eccentric, the accuracy of shape measurement, diameter measurement, and the like of the roller rolling surface decreases. Further, when the roller rolling surface is not a straight line (for example, in the case of a circular arc, a composite circular arc, and the like), there is no portion serving as a reference for measurement.

Accordingly, an object of the present invention is to provide a tapered roller bearing incorporating a tapered roller capable of accurately measuring the shape and diameter of a roller rolling surface.

[0005]

In order to solve the above problems, a tapered roller bearing according to the present invention is a tapered roller bearing in which a tapered roller is disposed between an inner ring and an outer ring, and the tapered roller is provided on an end face of the tapered roller. It is characterized in that a reference portion serving as a reference when measuring the rollers is provided.

In the tapered roller bearing of the present invention, a reference portion is provided on the end face of the tapered roller as a reference when measuring the tapered roller. Therefore, in the process of manufacturing the tapered roller, the shape measurement and processing become precise. In the assembling process of the tapered roller bearing, the shape and diameter of the roller rolling surface can be accurately measured.

[0007] The tapered roller has a conical shape, has a pair of end faces at both ends thereof, and a conical side face serving as a roller rolling surface on the outer periphery between both end faces, and has a reference portion on at least one end face. Have. The reference portion may be a plane perpendicular to the central axis of the tapered rollers, or a cylindrical surface equidistant from the central axis of the tapered rollers.

[0008]

[First Embodiment] FIG. 1 is a side view showing a partial structure of a tapered roller bearing according to a first embodiment. The roller bearing has a radial type structure, and includes a plurality of conical rollers 1, and an outer ring 3 and an inner ring 5 that relatively rotate around the axis AX via these rollers 1.

FIG. 2 is a view for explaining the structure of the roller 1 incorporated in the tapered roller bearing of FIG. 1. FIG. 2 (a) is a longitudinal sectional view, and FIG. 2 (b) is a side view. . The illustrated roller 1 includes a head end surface 12 formed of a spherical surface having a small curvature and a tail end surface 11 formed of a flat surface.
A conical rolling surface 13 is provided on a peripheral side surface between them. Head end face 1
A recess 20 is formed at the center of 2. This recess 2
Reference numeral 0 denotes a two-stage structure, in which the small-diameter deep portion 21 retains the so-called relief formed at the time of the header processing of the roller 1, and the large-diameter shallow portion 22 includes such a relief. Is precisely ground by end milling. As a result, the bottom surface 22a of the shallow portion 22
It is a reference plane perpendicular to the central axis CX of the roller 1, and the side surface 22 a of the shallow portion 22 is a reference cylindrical surface equidistant from the central axis CX of the roller 1.

FIG. 3 is a view for explaining the processing of the head of the roller 1. First, a holding table 7 having an inner diameter surface 7a having the same taper as the rolling surface 13 of the roller 1 is prepared. Next, the roller 1 is set on the holding table 7 and centered. By centering in this manner, the center axis CX of the roller 1 can be made to coincide with the axis of the holding table 7. Next, by end milling,
A shallow portion 22 having a diameter larger than that of the concave portion is formed in the head end surface 12 having a concave portion serving as a relief. As described above, by such end milling, the bottom surface 22a of the shallow portion 22 becomes a reference plane perpendicular to the central axis CX of the roller 1, and the side surface 22b of the shallow portion 22 is separated from the central axis CX of the roller 1 and the like. It becomes the reference cylindrical surface of the distance. If this shallow part 22 is used, the head end face 12
Can be precisely finished, and the arc processing of the rolling surface 13 can also be precise. Further, at the time of assembling the tapered roller bearing, the shape and diameter of the rolling surface 13 can be accurately measured.

Second Embodiment Hereinafter, a tapered roller bearing according to a second embodiment will be described. The tapered roller bearing according to the second embodiment is a modified example of the bearing according to the first embodiment, and the same portions are denoted by the same reference numerals and the description thereof will not be repeated.

FIG. 4 is a view for explaining the structure of the roller 201 incorporated in the tapered roller bearing of the present embodiment. FIG. 4 (a) is a longitudinal sectional view, and FIG. 4 (b) is a side view. is there. At the center of the head end surface 12 of the roller 201, a concave portion 21 which is a relief formed at the time of header processing is formed, and a precision flat portion 222a is formed around the concave portion 21 by cutting or grinding. . This flat part 222a
Is a reference plane perpendicular to the central axis CX of the roller 201.

[Third Embodiment] Hereinafter, a tapered roller bearing according to a third embodiment will be described. The tapered roller bearing of the third embodiment is a modification of the bearing of the first embodiment.

FIG. 5 is a view for explaining the structure of the roller 301 incorporated in the tapered roller bearing according to the present embodiment. FIG. 5 (a) is a longitudinal sectional view, and FIG. 5 (b) is a side view. is there. A recess 321 is formed at the center of the head end surface 12 of the roller 301 by cutting or grinding the bottom of the clearance formed at the time of header processing. The bottom surface 321a of the concave portion 321 is a reference plane perpendicular to the central axis CX of the roller 301.

[Fourth Embodiment] Hereinafter, a tapered roller bearing according to a fourth embodiment will be described. The tapered roller bearing of the fourth embodiment is a modification of the bearing of the first embodiment.

FIG. 6 is a view for explaining the structure of a roller 401 incorporated in the tapered roller bearing according to the present embodiment. FIG. 6 (a) is a longitudinal sectional view, and FIG. 6 (b) is a side view. is there. At the center of the head end surface 12 of the roller 401, a recess 421 serving as a relief formed at the time of header processing remains. A flat surface 411a is formed at the center of the tail end surface 411 by cutting or grinding. The flat surface 411a is a reference plane perpendicular to the central axis CX of the roller 401.

[0017]

As is apparent from the above description, according to the tapered roller bearing of the present invention, since the end face of the tapered roller is provided with a reference portion which serves as a reference when measuring the tapered roller, The shape measurement and processing become precise during the manufacturing process and the like, and the shape and diameter of the roller rolling surface can be accurately measured during the assembly process of the tapered roller bearing and the like.

[Brief description of the drawings]

FIG. 1 is a sectional view of a tapered roller bearing according to a first embodiment.

FIG. 2 is a sectional view and a side view illustrating the structure of the tapered rollers of FIG.

FIG. 3 is a view for explaining one process of machining the tapered rollers of FIG. 2;

FIG. 4 is a cross-sectional view and a side view illustrating a structure of a tapered roller constituting a tapered roller bearing according to a second embodiment.

5A and 5B are a cross-sectional view and a side view illustrating a structure of a tapered roller constituting a tapered roller bearing according to a third embodiment.

FIG. 6 is a sectional view and a side view illustrating a structure of a tapered roller constituting a tapered roller bearing according to a fourth embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 201,301,401 Roller 3 Outer ring 5 Inner ring 7 Holder 11 Tail end surface 12 Head end surface 13 Rolling surface 20,21,321,421 Concave part 222a Flat part 411a Flat surface

Claims (1)

[Claims] 1. A tapered roller bearing having a tapered roller disposed between an inner ring and an outer ring, wherein a reference portion serving as a reference when measuring the tapered roller is provided on an end face of the tapered roller. bearing.