KR20180075744A - Angular contact ball bearing with improved assembly, assembling method thereof and a case for angular contact ball bearing - Google Patents

Abstract

The present invention provides an angular contact ball bearing with improved assembly characteristics, an assembling method thereof, and a case for the angular contact ball bearing. The angular contact ball bearing with improved assembly characteristics includes: an outer wheel (110) having a concave outer wheel track surface (111) formed on an inner circumferential surface while being spaced apart from one axial end, and having a counter bore (113) extending in one axial side from the outer wheel track surface (111); an inner wheel (120) having a concave inner wheel track surface (123) formed at an axial center, and having an inner wheel outer circumferential surface (121) extending in an axial direction on both sides of the inner wheel track surface (123); a plurality of balls (140) disposed between the outer wheel (110) and the inner wheel (120) while being spaced from each other in a circumferential direction; and a cage (130) spaced apart in the circumferential direction and having a pocket part (137) accommodated therein with the ball (140) to maintain a distance between the balls (140). Since the outer wheel is not provided with a sill protruding in a radial direction, an assembling process due to thermal expansion is unnecessary, so that it is easy for a user to assemble or separate the bearing to or from a shaft and a housing. In addition, a sill part is formed due to the outer circumferential surface of the inner wheel so that the inner wheel and the ball are prevented from being separated from each other even when the outer wheel is separated, and the bearing is prevented from being damaged by tilting.

Description

Technical Field [0001] The present invention relates to an angular contact ball bearing, an assembling method thereof, and an angular contact ball bearing,

The present invention relates to an angular contact ball bearing with improved assemblability, a method of assembling the same, and a cage for an angular contact ball bearing. More particularly, the present invention relates to an angular contact ball bearing in which assembly process by thermal expansion is unnecessary, To a cage for a contact ball bearing.

Generally, angular contact ball bearings are capable of receiving radial load, thrust load, and composite load, and are widely used for high-precision and high-speed rotation because of their high load capacity.

Figure 1 shows a conventional angular contact ball bearing.

1, a conventional angular contact ball bearing has a plurality of balls 6 interposed between the outer ring 2 and the inner ring 4 along a circumferential surface thereof, and the interval between the plurality of balls 6 The retainer 8 is engaged. On the outer circumferential surface of the inner ring 4 and the inner circumferential surface of the outer ring 2, the raceways 2a and 4a in contact with the balls are formed as curved surfaces.

At this time, a line L connecting the raceway surface 2a and the center of the raceway surface 4a is inclined at a predetermined angle (referred to as 'contact angle'). Therefore, the tilted balls can simultaneously receive the radial load and the thrust load.

A protruding protrusion 2b 4b having a predetermined height h1 and h2 is formed at a portion of the raceway surface 2a and 4a where the ball 6 is not engaged so that the outer ring 2 and the inner ring 4 are not separated Respectively.

However, in the conventional angular contact ball bearing, since the outer ring 2 is thermally expanded due to the protrusions 2b and 4b and then assembled to the inner ring 4 via the ball 6 and the retainer 8, There was a problem.

In addition, when excessive tilting occurs, the contact stress of the protruding jaws 2b and 4b rides over the protruding jaws 2b and 4b, causing a bearing failure.

Registered Utility Model Registration No. 20-0257340 (Dec. 24, 2001)

Disclosure of Invention Technical Problem [8] The present invention has been proposed in order to solve the above problems, and it is an object of the present invention to provide a ball- And an angular contact ball bearing cage. The angular contact ball bearing includes: an angular contact ball bearing;

An angular contact ball bearing having improved assemblability according to the present invention comprises an outer ring made up of an outer race raceway surface which is spaced apart from one axial end and which is concave on an inner race surface and a counter bore extending from the outer race raceway surface to one side in the axial direction, An inner ring having a concave inner ring raceway surface and axially extending inner ring outer race surfaces on both sides of the inner ring raceway surface; a plurality of balls spaced apart in the circumferential direction and provided between the outer ring and the inner ring; And a cage having a pocket formed therein to receive the balls and maintain a distance between the balls. The angular contact ball bearing has improved assemblability.

In the above, the cage is annular and is circumferentially spaced apart and formed with a radially perforated pocket hole, and a first projection projecting radially outward between the pocket holes and having a concave surface facing each other is formed in an arcuate shape And second protrusions formed on both sides of the first protrusions in a circumferential direction and extending in a radially outward direction, the second protrusions being concave so as to have an arcuate surface facing each other.

The pocket portion is formed of a first inclined surface which is the inner surface of the pocket hole on both sides in the axial direction in which the first projection is not protruded. On both sides in the circumferential direction where the first projection is formed, a first inclined surface, which is the inner surface of the pocket hole, And a third inclined surface which is a surface of the second projection facing the second inclined surface.

The inclination angle of the first inclined surface with respect to the radial direction is larger than the inclination angle of the third inclined surface and smaller than the inclination angle of the second inclined surface.

In the above, the inner diameter of the cage is formed to be larger than the outer diameter of the inner ring, and is smaller than the sum of the outer diameter of the inner ring and the diameter of the ball.

According to another aspect of the present invention, there is provided a method of assembling an angular contact ball bearing having improved assemblability, comprising: A cage inserting step of inserting a cage into the inner ring; a ball inserting step of inserting the ball into the inner ring and the cage inwardly in a radially outward direction; And an outer ring assembling step of assembling the outer race of the angular contact ball bearing.

The angular contact ball bearing cage of the present invention comprises an outer ring and an inner ring each having a raceway surface and an angular contact ball bearing composed of a plurality of balls between the outer ring and the inner ring, A cage for a ball bearing, comprising: a cage body having an annular shape and a pocket hole radially spaced apart from the cage body and radially penetrating the cage body; a cage body protruding radially outwardly between the pocket holes, And a second projection formed to extend in a radially outward direction from both ends in the circumferential direction of the first projection and recessed in a circular arc shape so as to face each other; Wherein the pocket portion is formed by the inner surface of the pocket hole and the surface of the first projection facing each other with the pocket hole interposed therebetween and the surface of the second projection facing the pocket hole between the pocket portion and the inner surface of the pocket hole. A bearing cage is provided.

The pocket portion is formed of a first inclined surface which is the inner surface of the pocket hole on both sides in the axial direction in which the first projection is not protruded. On both sides in the circumferential direction where the first projection is formed, a first inclined surface, which is the inner surface of the pocket hole, And a third inclined surface which is a surface of the second projection facing the second inclined surface.

The inclination angle of the first inclined surface with respect to the radial direction is larger than the inclination angle of the third inclined surface and smaller than the inclination angle of the second inclined surface.

The angular contact ball bearing having improved assemblability according to the present invention, the method of assembling the same, and the cage for an angular contact ball bearing according to the present invention do not have a jaw protruding in the radial direction on the outer ring, It is easy to assemble or disassemble the bearing to the housing and the jaw portion can be formed due to the outer diameter surface of the inner ring so that the inner ring and the ball are prevented from being separated from each other even if the outer ring is separated and the bearing is prevented from being broken by tilting have.

1 is a sectional view showing a conventional angular contact ball bearing,
2 is a cross-sectional view showing an angular contact ball bearing with improved assemblability of the present invention,
3 is a perspective view showing a cage of an angular contact ball bearing with improved assemblability of the present invention,
4 is a cross-sectional view showing a cage of an angular contact ball bearing with improved assemblability of the present invention,
FIG. 5 illustrates a part of a ball and a cage for explaining a state in which a ball is inserted into a cage of an angular contact ball bearing with improved assemblability according to the present invention,
6 shows a part of a ball and a cage for explaining a state where a ball is inserted into a cage of a cage of an angular contact ball bearing with improved assemblability of the present invention,
7 is a flowchart showing a process of assembling an angular contact ball bearing with improved assemblability according to the present invention,
8 shows the inner ring and the cage in the cage inserting step of the angular contact ball bearing with improved assemblability according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the present embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout. In the detailed description, description of the contents described in the prior art will be omitted.

3 is a perspective view showing a cage of an angular contact ball bearing with improved assemblability according to the present invention, and FIG. 4 is a perspective view showing an assembled state of the angular contact ball bearing according to the present invention. FIG. 2 is a cross- FIG. 5 is a view showing a part of a ball and a cage for explaining a state where a ball is inserted into a cage of an angular contact ball bearing with improved assemblability according to the present invention, and FIG. 6 is a view showing a part of a ball and a cage for explaining a state where a ball is inserted into a cage of a cage of an angular contact ball bearing with improved assemblability according to the present invention. FIG. 8 is a flowchart showing a procedure of an assembling method of an angular contact ball bearing, and FIG. 8 is a flowchart showing a method of assembling an angular contact ball bearing The insertion step shows a state of the inner ring and the cage.

In the following description, the horizontal direction in Fig. 2 is referred to as "axial direction" and the vertical direction is referred to as "radial direction".

2, an angular contact ball bearing 100 according to the present invention includes an outer ring 110, an inner ring 120, a ball 140, and a cage 130.

The outer ring 110 is provided in a ring shape. The inner diameter surface of the outer ring 110 is composed of an outer ring raceway surface 111 formed to be inwardly concave spaced from one axial end and a counter bore 113 extending from the outer ring raceway surface 111 in one axial direction.

The inner diameter of the counter bore 113 is formed to be equal to or larger than the diameter of the circumscribed circle of the ball 140 since the counter bore 113 extends in the axial direction from the contact point 111a where the ball contacts the outer ring 110. As a result, the outer ring 110 does not have a stepped surface protruding in the radial direction, thereby facilitating assembly and disassembly.

The inner ring 120 is provided in a ring shape. The outer diameter surface of the inner ring 120 is composed of an inner ring raceway surface 123 formed concavely at the center in the outer diameter direction and inner and outer ring surfaces 121 extending in the axial direction on both sides of the inner ring raceway surface 123.

The inner ring outer circumferential surface 121 is spaced radially outward from the contact point 123a where the ball contacts the inner ring 110 so that the inner ring 120 is formed with balls 140 ) Is constrained. Therefore, even if the outer ring 110 is separated, the inner ring 120 and the ball 140 are prevented from being separated from each other.

Also, even if excessive tilting occurs, since the inner ring outer diameter surface 121 is formed radially outward than the contact point 123a, the ball 140 can not ride over the outer diameter surface 121 of the inner ring, so that breakage of the bearing is prevented.

The balls 140 are provided in a plurality of spaces between the outer ring 110 and the inner ring 120. The balls 140 are spaced along the circumferential direction.

3 to 4, the cage 130 is provided between the outer ring 110 and the inner ring 120. The cage 130 has a pocket portion 137 formed therein. The pocket portion 137 is circumferentially spaced and radially penetrated to receive the ball 140. The distance between the balls 140 is maintained by the pocket portion 137. The cage 130 includes a cage body 131, a first protrusion 133, and a second protrusion 135.

The cage body 131 is formed in a ring shape having a rectangular cross section. The inner diameter of the cage body 131 is formed to be larger than the outer diameter of the inner ring 120 and smaller than the sum of the outer diameter of the inner ring 120 and the diameter of the ball 140. The cage body 131 is formed with a pocket hole 131a which is circumferentially spaced and radially penetrated. The pocket hole 131a is formed in the center of the cage body 131 in the axial direction away from both axial ends thereof.

The first protrusion 133 is provided on the outer surface of the cage body 131 between the pocket holes 131a. The first protrusions 133 protrude radially outward from the cage body 131 and are concaved to have an arc-shaped surface facing each other with the pocket hole 131a therebetween. The first protrusion 133 is provided at a central portion of the cage body 131 in the axial direction, away from both axial ends of the cage body 131.

The second protrusion 135 extends radially outward from both ends of the first protrusion 133 in the circumferential direction. The two second protrusions 135 provided on the first protrusions 133 are spaced apart from each other in the circumferential direction. The second protrusions 135 are formed in a concave shape so as to have an arc-shaped surface facing each other with the pocket hole 131a therebetween. The two second protrusions 135 provided on the first protrusions 133 are formed to be curved away from each other in the axial direction from the center in the axial direction.

3 to 6, the pocket portion 137 is formed by the pocket hole 131a, the first protrusion 133, and the second protrusion 135. As shown in FIG. The pocket portion 137 is formed by a first inclined surface 137a which is the inner surface of the pocket hole 131a on both sides in the axial direction where the first projection 133 does not protrude, A second inclined surface 137b which is the surface of the first projection 133 facing each other with the pocket hole 131a interposed therebetween and the second inclined surface 137b which is the inner surface of the pocket hole 131a, And a third inclined surface 137c which is the surface of the second protrusion 135 facing each other with the first and second protrusions 131a and 131a therebetween.

The first inclined surface 137a is inclined so that the inner diameter of the pocket hole 131a becomes smaller as it goes radially inward. The second inclined surface 137b is formed to be inclined so that the diameter of the virtual circle formed by the second inclined surface 137b becomes smaller as it goes radially inward. The third inclined surface 137c is inclined so that the diameter of the virtual circle formed by extending the third inclined surface 137c becomes smaller as it goes radially inward.

The inclination angle of the first inclined face 137a with respect to the radial direction is larger than the inclination angle of the third inclined face 137c and smaller than the inclination angle of the second inclined face 137b. When the ball 140 is inserted into the pocket 137, the ball 140 is easily inserted by the third inclined surface 137c. However, due to the second inclined surface 137 having a large inclination angle after being inserted, So that it can not escape from the cage 130. Therefore, the balls 140 are prevented from being separated from the ball 140 even if the cage 130 does not surround the balls 140.

The gap between the cage 130 and the ball 140 increases as the cage 130 moves radially inwardly and the gap between the cage 130 and the ball 140 increases between the cage 130 and the ball 140. [ The lubricating oil (grease) provided therein flows smoothly. At this time, the center of the ball 140 is positioned radially inwardly at a size smaller than the outer diameter C1 of the cage body 131. [

A method of assembling an angular contact ball bearing with improved assemblability according to an embodiment of the present invention will now be described with reference to FIGS. 5 to 8. FIG.

5 to 8, an assembling method of an angular contact ball bearing includes an inner ring preparing step ST-110, a cage inserting step ST-120, a ball inserting step ST-130, And an assembling step (ST-140).

In the inner ring preparing step (ST-110), the inner ring 120 is prepared. An inner ring raceway surface 123 in which the balls 140 are received and an inner ring outer surface 121 extending in the axial direction on both sides of the inner ring raceway surface 123 are formed on the outer diameter surface of the inner ring 120.

In the cage inserting step ST-120, the inner ring 120 is inserted into the cage 130 so that the cage 130 is provided outside the inner ring 120. The cage 130 is inserted so that the inner ring raceway surface 123 of the inner ring 120 and the pocket portion 137 of the cage 130 are in communication with each other. Since the axial length of the cage 130 is smaller than the axial length of the inner ring 120, the assembly device J may be provided to allow the inner ring raceway 123 and the pocket portion 137 to communicate with each other. have.

The assembling device J is formed with a step protruding in the axial direction by t. t is formed to be a half of the difference between the axial length of the inner ring 120 and the axial length of the cage 130. [ The jaws are positioned on the inner ring 120 and the ends of the cage 13 are in contact with the jaws so that the axial center of the inner ring 120 and the axial center of the cage 130 The position is matched.

In the ball insertion step ST-130, as the ball 140 is radially inwardly pressed inwardly from the inner ring 120 and the cage 130 to be pressed into the pocket portion 137, the inner ring 120 and the cage 130, (130). Since the second protrusion 135 of the cage 130 is spaced apart in the circumferential direction in the ball insertion step ST-130, deformation of the pocket portion 137 is facilitated when the ball 140 is inserted.

In the outer ring assembly step (ST-140), the outer ring 110 is assembled by pressing the inner ring 110 inward from the axial direction. The counterbore 113 of the outer ring 110 does not have a portion that extends from the end portion to the outer ring raceway surface 111 when the outer ring 110 is inserted.

This assembly method eliminates the assembly process due to the thermal expansion required for assembling existing angular contact ball bearings, which is easy for the user to assemble or separate the bearings into the shaft and the housing, and is easy to manufacture due to the same assembling process of the tapered roller bearing .

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. It will be appreciated that various modifications and equivalent embodiments are possible. Accordingly, the scope of the true technical protection should be determined by the technical idea of the appended claims.

100: Angular contact ball bearings
110: outer ring 120: inner ring
130: Cage 140: Ball
131a: pocket hole 133: first projection
135: second projection 137: pocket portion

Claims (8)

An outer ring 110 composed of an outer ring raceway surface 111 formed to be concave on the inner diameter surface and spaced from one axial end and a counter bore 113 extending from the outer ring raceway surface 111 in one axial direction,
An inner ring 120 composed of an inner ring raceway surface 123 formed concavely at the center in the axial direction and an inner ring outer diameter surface 121 extending in the axial direction on both sides of the inner ring raceway surface 123,
A plurality of balls 140 disposed between the outer ring 110 and the inner ring 120 and spaced from each other in the circumferential direction,
And a cage (130) spaced apart in the circumferential direction and having a pocket (137) formed therein for inserting the ball (140) to maintain a distance between the balls (140). The apparatus of claim 1, wherein the cage (130) is annular and is circumferentially spaced to define a pocket hole (131a) radially penetrating,
First protrusions 133 protruding radially outwardly between the pocket holes 131a and formed in a concave shape so as to face each other,
And a second protrusion (135) formed to extend radially outward from both ends in the circumferential direction of the first protrusion (133) and being concave so as to have an arcuate surface facing each other. Contact ball bearings. The portable terminal according to claim 2, wherein the pocket portion (137) is formed with a first inclined face (137a) on the inner side of the pocket hole (131a) on both sides in the axial direction in which the first projection (133)
On both sides in the circumferential direction where the first protrusions 133 are formed, a first inclined surface 137a which is an inner surface of the pocket hole 131a and a second inclined surface 137b which is a surface facing the first protrusions 133, And the third inclined surface (137c), which are the surfaces of the third inclined surface (135) facing each other. 4. The apparatus according to claim 3, wherein the inclination angle of the first inclined surface (137a) with respect to the radial direction is larger than the inclination angle of the third inclined surface (137c) and smaller than the inclination angle of the second inclined surface (137b) This improved angular contact ball bearing. The method of assembling an angular contact ball bearing according to claim 1, wherein the angular contact ball bearing has improved assemblability.
An inner ring preparing step ST-110 in which the inner ring 120 is first prepared,
A cage inserting step ST-120 in which the cage 130 is inserted into the inner ring 120,
A ball inserting step ST-130 for pushing the ball 140 inwardly from the radially outward direction into the inner ring 120 and the cage 130,
And an outer ring assembly step (ST-140) in which the outer ring (140) is inserted and assembled inward from the axially outward direction. An outer ring 110 and an inner ring 120 each having a raceway surface and a plurality of balls 140 provided between the outer ring 110 and the inner ring 120. The balls 140 The cage for an angular contact ball bearing according to claim 1, wherein the pocket portion (137)
The cage 130 is annular and has a cage body 131 formed with a pocket hole 131a circumferentially spaced from and radially penetrating the cage 130. The cage body 131 protrudes radially outwardly between the pocket holes 131a, A first protrusion 133 formed to be concave to form an arcuate shape, a second protrusion 133 formed to extend in a radially outward direction from both ends in the circumferential direction of the first protrusion 133, 135);
The pocket portion 137 is formed by the inner surface of the pocket hole 131a and the surface of the first protrusion 133 facing each other with the pocket hole 131a interposed therebetween, And the second protrusions (135) facing each other. The cage for an angular contact ball bearing according to claim 1, The portable terminal according to claim 6, wherein the pocket portion (137) is formed as a first inclined face (137a) on the inner side of the pocket hole (131a) on both axial sides where the first projection (133)
On both sides in the circumferential direction where the first protrusions 133 are formed, a first inclined surface 137a which is an inner surface of the pocket hole 131a and a second inclined surface 137b which is a surface facing the first protrusions 133, And a third inclined surface (137c) which is a facing surface of the third inclined surface (135). The angular contact according to claim 7, wherein the inclination angle of the first inclined surface (137a) with respect to the radial direction is larger than the inclination angle of the third inclined surface (137c) and smaller than the inclination angle of the second inclined surface (137b) Cage for ball bearings.

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