KR101508443B1 - Roller Bearing Cage - Google Patents

Abstract

Provided is a roller bearing cage having an upper rime, a lower rim, and ribs. The ribs connecting the upper rim and the lower rim vertically are formed at regular distances so that multiple rib holes housing rollers respectively can be formed along a side circumference between the upper rim and the lower rim. The rib has both surfaces curved like the appearance of the roller. When the rib is partitioned into an upper and a lower part with respect to the center of the length thereof, both surfaces of a portion at the center of the upper part and both surfaces of a portion at the center of the lower part have chamber parts formed thereon respectively and preventing the misalignment of the roller. The roller bearing cage is capable of preventing the generation of a negative tilt angle in the case of driving the roller, is capable of reducing a friction force and a friction heat by minimizing the slip of the roller and a contact stress between the roller and an inner ring race, and is capable of improving the performance of a bearing and extending the service life of the bearing by reducing the friction torque and the vibration of the bearing and reducing the abrasion and the noise of the bearing.

Description

Roller Bearing Cage {Roller Bearing Cage}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roller bearing cage, and more particularly, to a roller bearing cage capable of preventing slippage during driving of a roller and reducing frictional force and frictional heat with the roller, will be.

Generally, a roller bearing is composed of an outer ring, an inner ring, a cage, and a roller, and even if misalignment occurs due to the spherical shape of the outer ring raceway surface of the bearing The geometry of the bearings is characterized by self-centering within 1 to 2.5 degrees.

In order to increase the durability and load capacity, the roller bearings generally use a high carbon chromium bearing steel (KS-STB2) for inner and outer rings and roller materials, and the cage is made of a pressed steel cage pressed steel cage, light metal and machined cage, and the inner ring structure is designed in the range of 4 to 18 ° around the vertical axis, so that the combined axial and radial loads Is used.

Particularly, the roller bearings with self-aligning feature are characterized by their geometrical structure, which is large in radial load capacity, suitable for heavy load and impact load, and also used for deflection or deflection of shafts. .

Here, the cage serves to hold the roller between the inner ring and the outer ring of the bearing to a predetermined position, thereby uniformly distributing the load to the outer ring raceway surface of the bearing. It also minimizes frictional heat and torque generated during rotation, and plays an important role in low vibration and low noise.

However, the conventional cage has a structure in which when the roller is assembled with the roller, the outer surface of the roller contacts the entire sash of the window name. Therefore, as the roller is rotated and has a large contact area, the bearing torque and vibration must be large. The large bearing torque and vibration means that the performance of the bearing used for the smooth rotation of the mechanical elements such as the drive shaft is poor and the excessive load is concentrated on the cage during use, Resulting in deterioration of the lifetime of the battery.

In order to solve the above problems, the present applicant has proposed a spherical roller bearing retainer in a prior application No. 10-2012-0145354.

1, the sphere roller bearing retainer 10 is formed by forming the sash 12 side of the window 11 in which the roller 20 is received to have a curved surface like that of the roller 20, And the frictional torque and the vibration of the bearing are reduced by reducing the frictional force and the frictional heat of the roller 20 and reducing the wear and noise, Improvement and life span.

However, in roller bearings with self-aligning function, a skew angle is generated when the roller is driven in a specific geometric shape. If the skew angle is negative, friction and heat are generated on the bearing raceway surface And causes rolling contact fatigue, thereby shortening the life of the bearing.

In addition, the roller bearing having an automatic pivot function has a larger slip at high surface pressure than the other bearings, and the slip has a spin slip caused by the rotation axis angle of the inner ring and the roller, and a differential slip 2 Type slip is generated.

Such slip has a classic failure mechanism in which rib marking is formed on the raceway surface to develop into an initial stage of fatigue failure, rib marking appears on the raceway surface, and micro fatigue cracks are generated and finally peeled off. That is, the rib marking, which is a main factor of the breakage mechanism, affects the contact stress occurring on the raceway surface, slip of the roller, and the like.

However, since the conventional retainer used in the roller bearing having an automatic alignment function is formed only at the center of the sash, the tangential speed is different when the roller rotates and revolves on the spherical raceway surface, This is easy.

In addition, skewing motion of the roller occurs when the roller is driven, so that the contact stress generated on the surface of the track and the slip of the roller are large, thereby shortening the life of the bearing.

Korean Patent Publication No. 10-2011-0118457 (published on October 31, 2011)

Korea registered patent: 10-0921138 (Notice day October 10, 2009)

SUMMARY OF THE INVENTION The present invention has been made to solve the conventional problems,

It is an object of the present invention to provide an image forming apparatus in which a side surface of a window in which a roller is accommodated is formed into a curved surface like a roller and a chamber portion for preventing rollers from sliding on upper and lower sides of the window, The present invention is to provide a roller bearing cage which can prolong the service life of the bearing by minimizing the contact stress between the roller and the inner ring raceway surface and the slip of the roller to reduce frictional force and frictional heat.

It is also an object of the present invention to provide a roller bearing cage capable of reducing the friction torque and vibration of the bearing and reducing wear and noise to improve the performance of the bearing.

According to an aspect of the present invention, there is provided a roller bearing cage comprising: a roller bearing cage for vertically connecting an upper edge and a lower edge of the roller bearing cage, Wherein the cage has curved surfaces such that both side surfaces of the crate are the same as the outer shape of the roller, and when the crate is divided into an upper portion and a lower portion with respect to the center of the crate length, And a chamber portion formed on both side surfaces of the sash at both sides of the sash and at the center of the sash to prevent the roller from being twisted.

Here, the chamber part may include a slope inclined from the inside to the outside of the grate, and a support surface formed of a curved surface such as the outer shape of the roller, and protrude from the side of the grate.

The inclined surface is inclined at an angle of 13 to 17 degrees.

In addition, the inclined surface and the support surface of the chamber portion are formed in a ratio of 7: 3.

According to the roller bearing cage of the present invention, both sides of the sash are formed into curved surfaces similar to the outer shape of the roller, and when the sash is divided into upper and lower portions with respect to the center of the sash length, And the slip of the rollers is minimized, so that the frictional force of the rollers can be minimized, and the frictional force of the rollers can be reduced, And reduces frictional torque and vibration of the bearing, as well as reduces wear and noise, thereby improving the performance of the bearing and extending the service life of the bearing.

FIG. 1 (a) is a side view showing a conventional roller bearing cage, and FIG. 1 (b) is a side view showing a state in which a negative inclination angle is generated due to rotation of a roller accommodated in a conventional roller bearing cage.
2 is a perspective view illustrating a roller bearing cage according to an embodiment of the present invention;
3 is a perspective view showing a state in which a roller is housed in a window of a roller bearing cage according to an embodiment of the present invention;
FIG. 4 is a side view showing a state in which rollers are stably assembled by a chamber portion formed on a sash of a roller bearing cage according to an embodiment of the present invention. FIG.
5 is an enlarged cross-sectional view showing the roller bearing of the self-aligning function using the roller bearing cage of the present invention.

These and other objects, features and other advantages of the present invention will become more apparent by describing in detail preferred embodiments of the present invention with reference to the accompanying drawings. Hereinafter, the roller bearing cage of the present invention will be described in detail with reference to the accompanying drawings. For purposes of this specification, like reference numerals in the drawings denote like elements unless otherwise indicated.

FIG. 2 is a perspective view illustrating a roller bearing cage according to an embodiment of the present invention, FIG. 3 is a perspective view illustrating a state where a roller is housed in a window of a roller bearing cage according to an embodiment of the present invention, FIG. 5 is a side view of the roller bearing cage according to the embodiment of the present invention. FIG. 5 is a side view of the roller bearing cage according to the embodiment of the present invention. Roller bearing. Fig.

In the following description, the large-diameter side of the cage having the frustum-shaped outward direction with respect to the direction will be referred to as an upper portion and the small-diameter side will be described as a lower portion.

2 to 3, the roller bearing cage 100 of the present invention is configured such that the upper edge 110 of the large diameter and the lower edge 120 of the small diameter are arranged vertically and vertically, and the upper edge 110, A sash 130 vertically connecting the upper frame 110 and the lower frame 120 so as to form a plurality of window frames 140 that respectively receive the rollers 200 along the side edges of the upper frame 110 and the lower frame 120 And are provided at regular intervals.

When both sides of the grate 130 are curved like the outer shape of the roller 200 and the grate 130 is divided into the upper part a and the lower part b with respect to the center of the grate length, a chamber part 150 is provided on both sides of the grate 130 at the center of the lower part b and at both sides of the grate 130 at the center of the lower part b to prevent the roller 200 from being twisted.

Here, when both side surfaces of the grate 130 are formed in the same curved surface as the outer shape of the roller 200, there is no friction in driving the roller 200 accommodated in the window name 140.

The chamber part 150 is provided so as to protrude toward the window 140 with a predetermined width within the thickness range of the window 130 in order to prevent the roller 200 accommodated in the window 140 from being detached or distorted .

The chamber part 150 includes a slope 151 inclined outwardly from the inside of the grate 130 and a support surface 152 formed of a curved surface such as the contour of the roller 200.

Here, the inclined surface 151 preferably has an appropriate inclination with the roller 200 to minimize friction when the roller 200 is driven, and preferably has an inclination angle of 13 to 17 degrees.

The inclined surface 151 should be in a range of 70% or less of the thickness ratio of the grate 130 and the support surface 152 should be in a range of 30% or less of the thickness ratio of the grate 130. [ That is, it is preferable that the slope 151 and the support surface 152 are in a ratio of 7: 3 within the thickness range of the grate 130. The ratio between the inclined surface 151 and the supporting surface 152 plays a very important role in smooth rotation of the roller 200 and movement of the lubricant.

In addition, the bottom surface 160 of the cage 100 is formed at the same angle as the bottom surface angle of the roller 200. The bottom surface 160 of the cage 100 is formed at the same angle as the bottom surface contact angle of the roller 200 to prevent the roller 200 from being twisted or warped when the roller 200 is driven.

3 to 5, when the roller 200 is assembled to the window 140 of the cage, the chamber part 150 formed on the sash 130 holds the upper and lower sides of the roller 200 Thereby preventing negative inclination angles from occurring due to the roller 200 being slid when the roller 200 is driven.

The inclined surface 151 of the chamber part 150 minimizes the contact area of the roller 200 with the roller 200 and prevents the roller 200 from being separated from the roller 200. The side surface of the grate 130, The supporting surface 152 of the chamber part 150 guides the rotation of the roller 200 and smoothly rotates the roller 200. The lubricant flowing between the window 140 and the gap between the roller 200 The frictional heat of the roller 200 is reduced.

As described above, according to the present invention, both side surfaces of the grate are formed as curved surfaces as the outer shape of the roller, and when the grate is divided into the upper part and the lower part based on the center of the grate length, the roller is prevented from being twisted on both sides of the upper center and both sides of the lower center A negative inclination angle is not generated when the roller is driven, and the contact stress between the roller and the cage and the slip of the roller are minimized, thereby reducing the frictional force and frictional heat.

In addition, the friction torque and vibration of the bearing can be reduced, as well as wear and noise can be reduced, thereby improving the performance of the bearing and extending the service life of the bearing.

Although the preferred embodiments of the present invention have been described, the present invention is not limited to the specific embodiments described above. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the appended claims, And equivalents may be resorted to as falling within the scope of the invention.

100: cage 110: upper rim
120: lower edge 130:
140: window 150: chamber part
151: sloped surface 152: support surface
160: bottom surface 200: roller

Claims (4)

A cage having vertical ribs for vertically connecting an upper rim and a lower rim at regular intervals so that a plurality of window names for respectively accommodating rollers are formed along a side edge between an upper rim and a lower rim,
The cage has two sides of the sash formed in the same curved surface as the outer shape of the roller, and when the sash is divided into upper and lower portions with respect to the center of the sash length, And a chamber portion for preventing the rollers from being rotated,
Wherein the chamber part is composed of a slope surface inclined from the inside to the outside of the grate within a thickness range of the grate and a support surface composed of a curved surface such as the outer shape of the roller, and the inclined surface and the support surface of the chamber are in a ratio of 7: 3 And the roller bearing cage. The method according to claim 1,
Wherein the inclined surface is formed at an inclination angle of 13 DEG to 17 DEG. delete delete

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