CN221879986U - A tapered roller bearing with a straight arc combined with a curved rib - Google Patents

Abstract

A tapered roller bearing with a straight arc combined with a curved rib, comprising an inner ring, an outer ring, and a tapered roller and a retainer installed between the inner ring and outer ring raceway surfaces. The large end face of the tapered roller is a spherical surface, and the rib surface on the inner ring is composed of a straight line and a circular arc tangent to each other. The straight line segment of the rib surface is close to the inner ring raceway and forms a certain angle with the raceway. Through the matching design of the end face spherical radius and the angle of the rib straight line segment, the theoretical contact point between the spherical end face of the tapered roller and the rib is the tangent point. Through the combination of straight line segments and circular arcs, the contact area is smaller than the existing full straight line, and the friction is smaller; the rib portion close to the raceway has a large contact area and relatively large friction, which makes the roller maintain the tendency to squeeze the raceway, while reducing the probability of the roller detaching from the raceway, making the bearing run more smoothly.

Description

A tapered roller bearing with a straight arc combined with a curved rib

Technical Field

The utility model relates to the technical field of tapered roller bearings, in particular to a tapered roller bearing with a straight line arc combined curve rib.

Background Art

The ribs of tapered roller bearings are in contact with the roller end faces, sharing part of the axial force of the bearing. At present, the rib surface in engineering is a plane. There are many literatures on the contact between the base surface of the tapered roller ball and the ribs, which mainly focus on the contact position of the ribs and the calculation of elastic-hydrodynamic lubrication friction. The starting point is to reduce the contact friction between the ribs and the rollers; although it is generally believed that friction is an unfavorable factor and needs to be reduced as much as possible. On the other hand, the friction of the ribs has a positive significance for guiding the rotation of the rollers and controlling the roller posture. Therefore, the goal of lowering the friction and better controlling the roller posture has better engineering significance.

Utility Model Content

The utility model aims to provide a tapered roller bearing with a straight line arc combined with a curved rib.

The technical solution adopted by the utility model is: a tapered roller bearing with a straight-line arc combined curve rib, comprising an inner ring, an outer ring, a tapered roller and a retaining frame, the large end face of the tapered roller is a spherical surface, the inner ring is provided with a rib, the surface of the rib in contact with the large end face of the tapered roller is a rib surface, the cross-sectional shape of the rib surface is composed of a straight line segment L1 and an arc segment of a radius R, the straight line segment is close to the inner ring raceway and is tangent to the arc segment, and the contact point between the spherical surface and the rib is the tangent point where the straight line segment and the arc segment are tangent.

As a preferred solution, the angle between the surface where the straight line segment is located and the inner ring raceway surface is an acute angle.

As a preferred solution, the tangent point is located in the middle of the flange surface.

The beneficial effects of the utility model are:

Based on the defects of the prior art, a tapered roller bearing with a straight-arc combined curve rib is provided. By optimizing the structural design, the spherical end face of the tapered roller described in this scheme contacts the tangent point of the straight line segment and the arc segment on the rib, and the straight line segment is close to the inner ring raceway surface. Since the contact ellipse formed by the extrusion of the spherical surface and the plane is larger than the contact ellipse formed by the extrusion of the balls, the spherical end face of the tapered roller at the rib tangent point will form the following result: the contact area with the straight line segment is larger than the contact area with the arc segment, and then the friction force in the straight line segment will be greater than the friction force in the arc segment. Therefore, during the rotation of the roller, the friction force of the rib close to the raceway is larger, so that the roller maintains the tendency to squeeze the raceway and keeps the posture of not leaving the raceway.

Furthermore, the rib of this solution is a combination of straight line segments and circular arcs, so the contact area is smaller than that of the existing full straight line, that is, the friction is smaller; at the same time, the roller posture can be controlled to make the bearing run more smoothly.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

Figure 1 is a schematic diagram of the cooperation between the inner ring and the tapered roller in the utility model;

FIG2 is a partial enlarged schematic diagram of the rib in FIG1 ;

Figure 3 is a theoretical diagram of rib contact;

Figure 4 is a schematic diagram of roller disengagement.

Reference numerals: 1, inner ring, 1.1, rib, 1.2, inner ring raceway, 2, cone

Roller, 2.2, spherical surface, L1 is the length of the straight line segment, and R is the radius of the arc segment.

DETAILED DESCRIPTION

The present invention is described in detail below by way of exemplary embodiments. However, it should be understood that, without further description, elements, structures and features in one embodiment may also be beneficially combined in other embodiments.

It should be noted that: unless otherwise defined, the technical terms or scientific terms used in this article should be understood by people with ordinary skills in the field to which the utility model belongs. The words "one", "an" or "the" and the like used in the specification and claims of the utility model patent application do not express quantitative restrictions, but indicate the existence of at least one; "include" or "includes" and the like indicate that the elements or objects appearing before "include" or "includes" include the elements or objects listed after "includes" or "includes" and their equivalents, but do not exclude other elements or objects with the same function.

Embodiment 1

In order to more clearly describe the specific structural composition of the tapered roller bearing with a straight arc combined curved rib, this embodiment is described in conjunction with Figures 1-4:

As shown in FIG1 , a tapered roller bearing with a straight arc combined curved rib comprises an inner ring 1, an outer ring, and a tapered roller 2 and a cage assembly installed between the inner ring 1 and the outer ring raceway surface. The outer ring and the cage assembly are not shown in FIG1 , and the large end surface of the tapered roller 2 is a spherical surface 2.2.

As shown in Figure 2, the inner ring 1 has a flange 1.1, and the surface where the flange 1.1 contacts the tapered roller 2 is the flange surface. The cross-sectional shape of the flange surface is composed of a straight line segment L1 and an arc segment with a radius R; wherein the straight line segment L1 is close to the inner ring raceway 1.2 and the angle between the surface where the straight line segment is located and the inner ring raceway surface is an acute angle, the straight line segment and the arc segment are tangent, and the tangent point is located in the middle of the flange surface.

Through the matching design of the spherical radius of the tapered roller end face and the angle of the straight section of the rib, the contact point between the spherical end face of the tapered roller and the rib (the contact point shown in Figure 3) is the tangent point. The contact point described in this article is the theoretical contact point achieved through the matching design. At the same time, this contact point is the contact position between the tapered roller and the inner ring rib when it is not under load.

As shown in Figure 3, when a load is applied to the tapered roller bearing, the contact ellipse formed by the extrusion of the ball and the plane is larger than the contact ellipse formed by the extrusion of the ball and the ball. Then the tapered roller spherical surface 2.2 will form the following result at the tangent point of the rib: the contact area formed with the straight segment L1 is larger than the contact area with the arc segment, and then the friction force in the straight segment will be greater than the friction force in the arc segment. Therefore, during the rotation of the tapered roller 2, the friction force of the rib part close to the inner ring raceway 1.2 is larger, so that the tapered roller 2 maintains the tendency to squeeze the inner ring raceway, thereby reducing the probability of the tapered roller detaching from the inner ring raceway as shown in Figure 4.

By implementing the above technical means, the spherical end face of the tapered roller of the utility model contacts the rib in the middle, and can keep the roller from being separated from the raceway. Through the combination of straight line segments and circular arcs, the contact area is smaller than the existing full straight line, that is, the friction is smaller; at the same time, the roller posture can be controlled. Make the bearing run more smoothly and have better value.

The parts not described in detail in this embodiment are prior art.

It should be noted that although the utility model is described through the above embodiments, the utility model can also have other multiple embodiments. Without departing from the spirit and scope of the utility model, it is obvious that those skilled in the art can make various corresponding changes and deformations to the utility model, but these changes and deformations should all fall within the scope of protection of the attached claims of the utility model and their equivalents.

Claims (3)

1. The utility model provides a tapered roller bearing of sharp circular arc combination curve flange, includes inner circle, outer lane, tapered roller and holder, its characterized in that: the large end face of the tapered roller is a spherical surface, the inner ring is provided with a flange, the surface, which is contacted with the large end face of the tapered roller, of the flange is a flange surface, the section shape of the flange surface is composed of a straight line section L1 and an arc section with a radius R, the straight line section is close to the inner ring raceway and is tangent with the arc section, and the contact point of the spherical surface and the flange is a tangent point of the straight line section and the arc section.

2. The tapered roller bearing with a straight-line circular arc combined curve flange according to claim 1, wherein: the included angle between the surface of the straight line section and the inner ring roller way surface is an acute angle.

3. The tapered roller bearing with a straight-line circular arc combined curve flange according to claim 1, wherein: the tangent point is positioned in the middle of the flange surface.