JP2009041685A - Radial ball bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radial ball bearing for suppressing inconveniences including cage sounds, surface separation, temperature rise or seizure for a longer service life while sufficiently holding lubricant between a cage and a ball by sealing the inside of the bearing. <P>SOLUTION: The radial ball bearing 20 comprises an outer ring having an outer ring raceway surface, an inner ring having an inner ring raceway surface, the plurality of balls arranged between the outer ring raceway surface and the inner ring raceway surface, and the cage 10 formed in an annular shape as a whole and having the pockets at a plurality of positions in the circumferential direction for rollingly holding the plurality of balls in the pockets. The pockets of the cage each consist of spherical recessed face portions 11, 13 and a cylindrical recessed face portion 12 to form lubricant reservoir portions A, B near boundaries between each of the spherical recessed face portions and the cylindrical recessed face portion. Lubricant is filled in the bearing and a seal member is mounted on the fixed-side raceway ring to seal the inside of the bearing. The filled amount of the lubricant is greater than in the case that the pockets each have an almost unitary spherical recessed face. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a radial ball bearing configured to hold a plurality of balls disposed between an outer ring raceway surface and an inner ring raceway surface in a pocket of a cage so as to roll freely.

  The principal part of the conventional radial ball bearing is schematically shown in the longitudinal sectional view of the principal part in FIG. 3, and FIG. 4 shows a view of the cage pocket and ball in the direction X in FIG. As shown in FIGS. 3 and 4, in the conventional radial ball bearing, a plurality of balls 5 as rolling elements are arranged between the inner ring raceway surface 1 of the inner ring 2 and the outer ring raceway surface 3 of the outer ring 4. It has a cage 6 which is formed in an annular shape and holds a plurality of balls 5 in a pocket 18 provided at a plurality of locations in the circumferential direction so as to roll freely. FIG. 5 shows a perspective view of the cage 6 of FIGS.

  As shown in FIG. 5, the cage 6 is formed in an annular crown shape, and is manufactured by injection molding from a resin, and is used in place of a corrugated cage that is manufactured by press molding from a conventional metal. (See Patent Documents 1 and 2 below). 5 includes a pocket 18 provided to hold the balls 5 (FIGS. 3 and 4) so as to roll freely at a plurality of locations in the circumferential direction of the annular main portion 17; A plurality of pairs of elastically deformable claw-like elastic pieces (claw-like portions) 16a and 16b provided on both sides of 18 are provided. Each pocket 18 includes a concave surface portion 19 formed in a concave spherical shape toward the main portion 17 from between the pair of elastic pieces 16a and 16b. An opening T is formed between the pair of elastic pieces 16a and 16b in the upper portion of each pocket 18 in the figure.

  When the radial ball bearing as shown in FIG. 3 is assembled using the crown type cage 6 shown in FIG. 5, the ball 5 is elastically pushed to increase the distance between the tip edges of the pair of elastic pieces 16 a and 16 b of the pocket 18. It inserts so that it may push from the opening part T between elastic pieces 16a and 16b. Thus, the crown type cage 6 holds the balls 5 in the pockets 18 so that the balls 5 can roll between the inner ring raceway surface 1 and the outer ring raceway surface 3 (FIG. 3). .

As shown in FIG. 4, the concave surface portion 19 of each pocket 18 of the cage 6 has a substantially single spherical shape, and a spherical shape with a radius R centering on the center O of the ball 5 (shown by a broken line) in the pocket 18. It is concave.
Japanese Patent No. 3744663 Japanese Patent No. 3035766

  A radial ball bearing as shown in FIG. 3 is used with a lubricant filled in the bearing. During this use, the lubricant is placed between each pocket 18 and the ball 5 of the cage 6 in FIGS. 3 to 5. Supplied. However, since the concave surface portion 19 of the pocket 18 has a substantially single spherical shape as shown in FIG. 4, there is no place for retaining the lubricant between the cage 6 and the ball 5, and the lubricant tends to be insufficient. For this reason, lubrication becomes insufficient, and it becomes easy to generate cage noise, surface peeling, temperature rise, and the like, and further, there is a possibility of ball sticking.

  Further, when the inside of the radial ball bearing of FIG. 3 is sealed by providing seal members (see FIG. 1) in the portions C and D in the lateral direction (rotating shaft direction) in the drawing, thereafter, lubricant is supplied into the bearing. It is difficult. However, if the above problems occur due to insufficient supply of lubricant due to lack of lubricant, the bearing life will be reduced.

  In view of the above-described problems of the prior art, the present invention sufficiently retains the lubricant between the cage pocket and the ball when the bearing is sealed, and generates cage noise, surface peeling, and temperature rise. An object of the present invention is to provide a radial ball bearing capable of suppressing the occurrence of defects such as burn-in and extending the life.

  In order to achieve the above object, a radial ball bearing according to the present invention comprises an outer ring having an outer ring raceway surface, an inner ring having an inner ring raceway surface, and a plurality of members disposed between the outer ring raceway surface and the inner ring raceway surface. A radial ball bearing comprising a ball and a cage that is formed in an annular shape as a whole and has pockets in a plurality of locations in the circumferential direction and holds the plurality of balls in a freely rolling manner in the pocket, By forming a pocket of the cage from a spherical concave surface portion and a cylindrical concave surface portion, a lubricant reservoir is formed near the boundary between the spherical concave surface portion and the cylindrical concave surface portion, and the lubricant is sealed inside the bearing. At the same time, a seal member is attached to the bearing ring on the fixed side to seal the inside of the bearing, and the amount of the lubricant enclosed is larger than that in the case where the pocket is a substantially single spherical concave surface.

  According to this radial ball bearing, the volume capable of holding the lubricant can be increased by the lubricant reservoir formed near the boundary between the spherical concave portion and the cylindrical concave portion in the pocket. Many lubricants can be supplied and retained. For this reason, more lubricant can be enclosed inside the bearing before sealing with the seal member than when the pocket is a single spherical concave surface, so that the lubricity between the ball rolling surface and the pocket inner surface can be improved and maintained. It is possible to suppress the occurrence of problems such as cage noise generation, surface peeling, temperature rise, and seizure. For this reason, the lifetime of the bearing sealed by the sealing member can be increased.

  In the radial ball bearing, the spherical concave surface portion of the pocket has a first spherical concave surface portion formed in a spherical shape, and a second spherical concave surface portion formed in a spherical shape opposite to the first spherical concave surface portion. The cylindrical concave surface portion is formed between the first spherical concave surface portion and the second spherical concave surface portion, and the lubricant reservoir portion is between the first spherical concave surface portion and the cylindrical concave surface portion and the It is preferable to form each between a cylindrical concave surface portion and the second spherical concave surface portion. Since the lubricant reservoir is formed in multiple locations, a large volume capable of retaining the lubricant can be secured.

  The first spherical concave surface portion and the second spherical concave surface portion may be configured to have a radius larger than the radius of the ball, centered on a position shifted from the center of the ball in the pocket. preferable. Further, the first spherical concave surface portion and the second spherical concave surface portion may be configured to have a radius larger than the radius of the ball, with the center of the ball in the pocket as a center.

  Moreover, it is preferable that the said cylindrical concave surface part is formed in a cylindrical shape centering | focusing on the rolling center axis | shaft which the ball in the said pocket rolls.

  According to the radial ball bearing of the present invention, the lubricant reservoir can sufficiently hold the lubricant between the pocket of the cage and the ball, and a large amount of lubricant can be sealed inside the bearing before sealing with the seal member. The lubricity between the ball rolling surface and the pocket inner surface can be improved and maintained. For this reason, generation | occurrence | production of problems, such as a cage | basket sound generation | occurrence | production, surface peeling, a temperature rise, and seizing, can be suppressed, and the lifetime improvement of the bearing sealed with the sealing member can be achieved.

  The best mode for carrying out the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view of a main part schematically showing a main part of a radial ball bearing according to the present embodiment. FIG. 2 is a plan view similar to FIG. 4 showing the main part of the pocket of the cage of FIG.

  As shown in FIG. 1, the radial ball bearing 20 of the present embodiment includes an inner ring 21 having an inner ring raceway surface 21a on an outer peripheral surface, an outer ring 22 having an outer ring raceway surface 22a on an inner peripheral surface, an outer ring 22 and an inner ring 21. And a plurality of balls 24 which are rolling elements arranged between the two and a cage 10 for holding the plurality of balls 24 at a uniform position so as to be freely rollable.

  The radial ball bearing 20 is configured with a seal in the case of inner ring rotation, and includes seal members 30 and 33 on both sides of the rotation shaft. The seal member 30 is composed of a ring-shaped cored bar 31 having a flange on the outer periphery and an elastic body 32 formed by integrally vulcanizing synthetic rubber on the outer side thereof. An annular main portion 34 composed of an elastic body 32 other than the flange portion and an outer elastic body 32 thereof, and a hook portion of the core 31 and an elastic body outside thereof are engaged with a retaining groove 25 on the inner peripheral surface of the outer ring 22. And a lip portion 36 made of an elastic body on the inner peripheral side of the core metal 31 and in contact with the receiving groove 26 on the outer peripheral surface of the inner ring 21.

  The seal member 30 is inserted into the retaining groove 25 on the inner peripheral surface of the outer ring 22 while being elastically deformed while the lip portion 36 is in contact with the receiving groove 26 on the outer peripheral surface of the inner ring 21. It is disposed between the 20 outer rings 22 and the inner ring 21. The seal member 33 has the same structure as the seal member 30 and is similarly disposed between the outer ring 22 and the inner ring 21. As a general material for such seal members 30 and 33, a steel plate such as SPCC or SECC is used as a core metal, and nitrile rubber, acrylic rubber, silicone rubber, fluorine rubber or the like as an elastic body forming a lip or the like. Synthetic rubber is used. The seal members 30 and 33 are not limited to the contact rubber seal type as shown in FIG. 1, but may be a non-contact rubber seal or a non-contact steel plate type.

  The cage 10 shown in FIGS. 1 and 2 is formed in an annular shape as in FIG. 5, and a plurality of pockets 18 for holding a plurality of balls 24 are formed side by side at equal intervals in the circumferential direction. However, the same components as those in FIG.

  As shown in FIG. 2, the concave surface portion 29 of the pocket 18 of the cage 10 is provided on the bottom surface side facing the opening T, and centered on a center O <b> 1 shifted on the rolling center axis v from the center O of the ball 24. The first spherical concave surface portion 11 having a radius R1 (R1> r (r: radius of the ball 24)), and provided on both sides of the opening T on the right side of FIG. In the middle portion between the second spherical concave surface portions 13 and 13 having a radius R2 (R2> r) centered on the center O2 shifted on v, and the first spherical concave surface portion 11 and the first spherical concave surface portions 13 and 13 And cylindrical concave surface portions 12 and 12 respectively formed in a cylindrical shape. The cylindrical concave surface portions 12 and 12 are formed in a cylindrical shape having the rolling central axis v as a central axis. The cage 10 can be manufactured by injection molding with a resin.

  As shown in FIG. 2, in the concave portion 29 of the pocket 18, the boundary region between the first spherical concave portion 11 and the cylindrical concave portions 12, 12, and the second spherical concave portion 13, 13 and the cylindrical concave portion. When the ball 24 is incorporated and positioned in each of the boundary regions between the balls 12 and 12, as shown by the broken line in the figure, a gap is formed with respect to the ball 24. For this reason, the first lubricant reservoir A is formed between the first spherical concave surface portion 11 and the cylindrical concave surface portions 12, 12, and the second spherical concave surface portions 13, 13 and the cylindrical concave surface portions 12, 12 are formed. A second lubricant reservoir B is formed therebetween.

  As described above, a plurality of lubricant reservoirs A and B can be formed by forming the pocket 18 from a composite shape of two spherical concave surfaces and a cylindrical concave surface, and the lubricant reservoirs A and B are lubricated. Can store and hold the agent. With the plurality of lubricant reservoirs A and B, the cage 10 can hold a larger volume capable of holding the lubricant in the pocket 18 than the concave surface portion 19 made of a single spherical concave surface as shown in FIG. A lot of lubricant can be supplied and held between the pocket 18 and the ball 24 of the vessel 10.

  After the lubricant such as grease is sealed in the radial ball bearing 20, the inside of the bearing is sealed by the seal members 30 and 33 as shown in FIG. 1. In this case, the amount of lubricant sealed is the concave surface of the pocket 18. Since the portion 29 has a plurality of lubricant reservoirs A and B, the number can be increased as compared with the case of a single spherical concave surface as shown in FIG. For this reason, the lubricity between the rolling surface of the ball 24 and the concave surface portion 29 of the pocket 18 is improved, and it is possible to suppress the occurrence of problems such as cage sound generation, surface peeling, temperature rise, and seizure.

  Since the pocket of the conventional cage 6 as shown in FIG. 4 has a single spherical concave surface, there is no place for retaining the lubricant between the cage 6 and the ball 5, and the lubrication is insufficient and lubrication is not possible. It becomes sufficient, and it becomes easy to cause cage noise generation, surface peeling, temperature rise, seizure, etc., especially for bearings using seal members, it is difficult to supply lubricant after sealing, so much lubrication from the beginning It was necessary to encapsulate the agent. On the other hand, according to the radial ball bearing 20 of the present embodiment, the concave portion 29 of the pocket 18 of the cage 10 is constituted by two spherical concave portions and a cylindrical concave portion, so that a plurality of lubricant reservoirs are formed. A and B are formed, so that the space volume holding the lubricant becomes larger than that in the case of a single spherical concave surface, and a large amount of lubricant can be supplied. In this way, in the bearing in which the inside of the bearing is sealed with the seal members 30 and 33, a larger amount of lubricant can be sealed from the beginning, so that the lubrication between the rolling surface of the ball 5 and the concave surface portion 29 of the pocket 18 is achieved. Can be improved and maintained. As a result, it is possible to suppress the occurrence of problems such as cage noise, surface peeling, temperature rise and seizure due to lack of lubricant, and to extend the life of the radial ball bearing 20 sealed by the seal members 30 and 33. Can do.

  As described above, the best mode for carrying out the present invention has been described. However, the present invention is not limited to these, and various modifications are possible within the scope of the technical idea of the present invention. For example, in FIG. 2, the centers O1 and O2 of the radii of the first spherical concave surface portion 11 and the second spherical concave surface portion 13 are off, but they may be matched. That is, for example, as shown in FIG. 6, the first spherical concave surface portion 11 has a radius R3 (R3> r) centered on the center O of the ball 5, and the second spherical concave surface portions 13 and 13 also have the center O. You may comprise so that it may have the radius R4 (R4> r) made into the center.

  In FIG. 1, the inner ring 21 of the radial ball bearing is on the rotating side, but the outer ring 22 may be on the rotating side. In this case, a stop groove is formed on the inner peripheral surface of the inner ring 21, and the seal is sealed. Attach the member by fitting.

It is a principal part longitudinal cross-sectional view which shows roughly the principal part of the radial ball bearing by this Embodiment. It is a figure similar to FIG. 4 which shows the principal part of the pocket of the holder | retainer of FIG. It is a principal part longitudinal cross-sectional view which shows schematically the principal part of the conventional radial ball bearing. It is the figure which looked at the principal part of the pocket of the holder | retainer of FIG. 4 from the direction X of FIG. It is a perspective view which shows the whole holder | retainer of FIG. 3, FIG. It is a figure similar to FIG. 2 which shows the modification of the pocket of the holder | retainer of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Cage 11 1st spherical concave surface part 12 Cylindrical concave surface part 13 2nd spherical concave surface part 18 Pocket 20 Radial ball bearing 21 Inner ring 21a Inner ring raceway surface 22 Outer ring 22a Outer ring raceway surface 24 Ball 29 Concave part 30, 33 Seal member A, B Lubricant reservoir T Opening v Rolling center axis

Claims (5)

An outer ring having an outer ring raceway surface, an inner ring having an inner ring raceway surface, a plurality of balls arranged between the outer ring raceway surface and the inner ring raceway surface, and a plurality of balls in the circumferential direction formed in an annular shape as a whole. A radial ball bearing comprising a pocket at a location and a holder that holds the plurality of balls so as to roll freely in the pocket;
By forming a pocket of the cage from a spherical concave surface portion and a cylindrical concave surface portion, a lubricant reservoir is formed in the vicinity of the boundary between the spherical concave surface portion and the cylindrical concave surface portion,
The inside of the bearing is filled with lubricant and a seal member is attached to the stationary ring to seal the inside of the bearing.
A radial ball bearing characterized in that the amount of the lubricant enclosed is larger than when the pocket has a substantially single spherical concave surface. The spherical concave surface portion of the pocket has a first spherical concave surface portion formed in a spherical shape, and a second spherical concave surface portion formed in a spherical shape away from the first spherical concave surface portion, and the cylindrical concave surface A portion is formed between the first spherical concave surface portion and the second spherical concave surface portion,
The radial ball according to claim 1, wherein the lubricant reservoir is formed between the first spherical concave surface portion and the cylindrical concave surface portion and between the cylindrical concave surface portion and the second spherical concave surface portion. bearing.   3. The radial ball according to claim 2, wherein the first spherical concave surface portion and the second spherical concave surface portion each have a radius larger than the radius of the ball, centered on a position shifted from the center of the ball in the pocket. bearing.   3. The radial ball bearing according to claim 2, wherein the first spherical concave surface portion and the second spherical concave surface portion each have a radius that is larger than a radius of the ball, and that is substantially centered on the center of the ball in the pocket.   The radial ball bearing according to any one of claims 1 to 4, wherein the cylindrical concave surface portion is formed in a cylindrical shape around a rolling center axis on which balls in the pocket roll.

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