JP4812001B2 - Ball equally spaced arrangement apparatus and method for ball bearing - Google Patents

Description

  The present invention relates to an apparatus and a method for arranging a plurality of balls built in a ball bearing at equal intervals.

  In general, a ball bearing is composed of an inner ring, an outer ring, a ball, and a retainer. In this ball bearing assembly process, a plurality of balls built in between the inner ring and the outer ring are arranged at equal intervals. And after this arrangement | sequence work, the operation | work which mounts a retainer to a ball | bowl is performed, and the ball bearing by which the ball | bowl of equal intervals was hold | maintained so that rolling was possible by this was assembled. By the way, conventionally, for example, a method as disclosed in the following patent document has been adopted for the operation of arranging ball bearings.

  First, the first method is a method using a guide ring in which a claw is provided. First, a plurality of balls built in the ball bearing are once brought to one side, and a guide ring is placed on the ball bearing in the justified state. And the shaft provided with the spiral step part is inserted through the inside of the guide ring. Then, the stepped portion of the shaft hits the claw and pushes down the claw, and the pushed-down claw interrupts between adjacent balls to equalize the distance between the balls (for example, see Patent Document 1).

  Next, the second method is a method using a plurality of air nozzles. First, the inner ring of the ball bearing is mounted on the inner ring mounting block, and then the outer ring is mounted on the outer ring mounting block. Then, compressed air is blown toward each ball from the same number of air nozzles as the balls arranged uniformly between both blocks. As a result, each ball moves onto the air nozzle and the balls are evenly arranged (see, for example, Patent Document 2).

JP-A-9-225757

JP 2001-241458 A

  However, the conventional method as described above has the following problems.

  First, in the case of the method of Patent Document 1, since the nail is inserted between the balls and the interval is adjusted, the ball is damaged by the contact between the nail and the ball. In other words, if the ball is damaged, there is a problem that when the ball bearing is rotated, vibration and noise are generated, leading to a malfunction of the ball bearing.

  On the other hand, in the case of the method of Patent Document 2, the distance between the balls is adjusted by the air nozzles installed in the same number as the balls, so that the compressed air blown from the air nozzles becomes local. That is, it is necessary to equalize the air pressure between the balls. For this purpose, it is necessary to adjust the installation positions and pressures of all the air nozzles, and there is a problem that the adjustment is delicate and difficult.

  Accordingly, the present invention has been made to solve the above-described problems, eliminates scratches on the ball, suppresses vibration and noise during rotation of the ball bearing, and eliminates the need for adjustment of the installation position and pressure so that the ball can be efficiently used. The purpose is to perform an even arrangement.

  In order to achieve the above object, the present invention provides a ball equidistant arrangement apparatus and method for ball bearings described below.

That is, the ball equally spaced arrangement device in the ball bearing according to the present invention is configured such that the plurality of balls are placed in the annular space in a ball bearing in which a plurality of balls are housed in an annular space between the inner ring and the outer ring arranged coaxially. A device for arranging the ball bearings at equal intervals on an inner circumference, the supporting means for supporting the ball bearings in a direction in which the inner rings and the outer rings are perpendicular to the installation surface, and the axial direction of the ball bearings Air injection means for uniformly injecting compressed air over the entire annular space from the annular injection port from one end surface side to the other end surface side , and adjacent to the plurality of balls The difference in the distance between the adjacent balls causes a difference in the flow rate and flow velocity of the compressed air flowing between the adjacent balls. As a result, the suction between the adjacent balls is different. Due to the difference in force and the Bernoulli's theorem, the attractive force between adjacent balls tries to balance each other, so the ball is affected by the attractive force and the distance between all the balls The balls are finally arranged at equal intervals on the circumference in the annular space by rolling and moving in the circumferential direction so as to be uniform .

  The ball equidistant arrangement device having the above-described configuration may further include a fixing unit that fixes the inner ring of the ball bearing, and a rotating unit that rotates the outer ring of the ball bearing around its axis. On the other hand, it may further include a fixing means for fixing the outer ring of the ball bearing and a rotating means for rotating the inner ring of the ball bearing around its axis.

Also, the ball equidistant arrangement method in the ball bearing according to the present invention is a ball bearing in which a plurality of balls are incorporated in an annular space between an inner ring and an outer ring arranged coaxially, and the plurality of balls are placed in the annular space. The ball bearings are arranged at equal intervals on an inner circumference, and the ball bearings are supported in a direction in which the inner rings and the outer rings are oriented in a direction perpendicular to the installation surface. Compressed air is uniformly injected over the entire annular space from the annular injection port from one end surface side to the other end surface side, and during the injection, between the adjacent balls in the plurality of balls The distance between the adjacent balls causes a difference in the flow rate and flow velocity of the compressed air flowing between adjacent balls, resulting in a difference in the suction force between adjacent balls. At this time, because the suction force between adjacent balls tries to keep a balance with each other by Bernoulli's theorem, the balls are affected by the suction force so that the distance between all the balls becomes uniform. By rolling and moving in the circumferential direction, the balls are finally arranged at equal intervals on the circumference in the annular space .

  In the above-described ball equidistant arrangement method, it is preferable to inject the compressed air while fixing either the inner ring or the outer ring of the ball bearing and rotating the other around the axis.

[Operation of the present invention]
In the ball equidistant arrangement device and method of the present invention, the ball bearing is supported in such a manner that the shaft centers of the inner ring and the outer ring are perpendicular to the installation surface, and the other from the end surface side in the axial direction of the ball bearing. Compressed air was sprayed uniformly over the entire annular space toward the end face side of the. As a result, when the distance between adjacent balls is different, a difference occurs in the flow rate and flow velocity of the compressed air flowing between the balls, resulting in a difference in suction force. At this time, because Bernoulli's theorem tries to keep the attraction forces between adjacent balls balanced, the balls roll in the circumferential direction so that the distance between all the balls is uniform under the influence of the attraction force. Move. Therefore, the balls are finally arranged at equal intervals on the circumference in the annular space.

  If either one of the inner ring or outer ring of the ball bearing is fixed and the other is rotated around its axis, and the compressed air is injected, the frictional force generated on the contact surface between the inner ring or outer ring and the ball decreases. . For this reason, the rolling operation of the ball in the circumferential direction is performed more smoothly, and the time until the balls are arranged at equal intervals is shortened.

  According to the present invention, since the balls of the ball bearing are arranged at equal intervals using compressed air, there is no mechanical contact between the nail and the ball as in the conventional case, and the nail is damaged by the nail. Nor. Therefore, vibration and noise at the time of rotation of the ball bearing generated due to the scratch of the ball can be suppressed, and the quality of the ball bearing is improved.

  Further, according to the present invention, unlike the conventional method of blowing air from a plurality of air nozzles toward each ball, it is not necessary to adjust the installation position of each air nozzle and the air pressure. Therefore, there is an effect that the uniform arrangement can be efficiently performed by a simple and inexpensive method.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 is an overall view showing a ball equidistant arrangement device according to the present invention, and FIG. 2 is a plan view of an air nozzle as seen from the bottom.

  As shown in the figure, the ball equidistant arrangement device (hereinafter referred to as “ball evening device” in this embodiment) 10 of this embodiment is sandwiched between the inner ring 101 and the outer ring 102 at a stage before the retainer is mounted on the ball bearing 100. Is a device for arranging a plurality of balls 103, 103,... On the circumference at equal intervals. The apparatus 10 includes a support mechanism 20, a rotation mechanism 30, and an air injection mechanism 40.

  The support mechanism 20 is for supporting the ball bearing 100 on the ball distribution device 10 in a direction in which the axial centers L of the inner ring 101 and the outer ring 102 are perpendicular to the installation surface, and the cylindrical inner ring receiving jig 21 is supported. Prepare. A convex portion 21a having a predetermined thickness is formed at the center of the upper surface of the receiving jig, and the inner ring bottom surface is placed on the step portion 21b by fitting the inner ring 101 to the convex portion 21a. Thereby, the ball bearing 100 is supported in a horizontal posture.

  The rotation mechanism 30 is for moving the inner ring 101 and the outer ring 102 relatively, and includes a drive motor 31 and a roller 32. The output shaft 31 a of the drive motor is attached to the center of the roller 32. Therefore, when the drive motor 31 is driven, the roller 32 rotates in conjunction with this, and the outer ring 102 in contact with the outer peripheral surface of the roller 32 rotates in the reverse direction around the axis L by the rotational force of the roller 32. ing.

  The air injection mechanism 40 is for uniformly injecting compressed air from one end face side in the axis L direction of the ball bearing 100 toward the other end face side (in this embodiment, from the upper end face to the lower end face). Yes, it includes a compressor 41 and an air nozzle 42, both of which are connected by an air hose 43. The air nozzle 42 has a substantially cylindrical shape. When the air nozzle 42 is lowered, a convex portion 42 a formed at the center of the bottom surface is fitted into the inner ring 101. That is, the inner ring 101 is sandwiched and fixed between the air nozzle 42 and the inner ring receiving jig 21.

  An air passage 42b communicating with the air hose 43 is provided inside the air nozzle 42, and an air injection port 42c is opened along the circumferential direction at the lower end of the air passage 42b. As shown in FIG. 2, the air injection ports 42 c of the present embodiment are set to have substantially the same diameter as the annular space 104. When viewed from the bottom side of the air nozzle 42, the air injection ports 42 c are continuously connected on the circumference. It has an annular mouth.

  Therefore, when compressed air is discharged from the compressor 41, the compressed air is supplied into the air passage 42b of the air nozzle via the air hose 43. The compressed air passing through the air passage 42b is jetted vertically downward from the annular air injection port 42c toward the annular space 104 of the ball bearing.

  The above is the configuration of the ball distribution device according to the present embodiment. Next, a method for arranging balls at regular intervals using the ball distribution device (hereinafter referred to as “ball distribution method” in this section). explain.

  FIG. 3 is an overall view showing the ball bearing before the ball equalizing method is applied, and FIG. 4 is an enlarged view of the vicinity of the ball in the bearing.

  As shown in the drawing, the ball bearing 100 at the stage before the retainer is mounted has a plurality of (13 in the present embodiment) balls 103, 103,... In an annular space 104 between the inner ring 101 and the outer ring 102. Built in. These balls 103 are in a state where they can freely roll and move in the annular space 104 along the outer peripheral surface of the inner ring 101 and the inner peripheral surface of the outer ring 102 in the circumferential direction. Further, the distance between adjacent balls, for example, the distance between the balls 103A and 103B and the distance between the balls 103B and 103C are different.

  Then, the ball bearing 100 in this state is set in the ball distribution device 10 shown in FIG. 1, and the ball distribution method is applied as follows.

  First, in the support mechanism 20, the inner ring 101 is fitted into the inner ring receiving jig 21, and the air nozzle 42 is placed thereon to support the ball bearing 100 in a direction in which the axis L of the inner ring 101 and the outer ring 102 is perpendicular to the installation surface. . At this time, the inner ring 101 is sandwiched and fixed between the air nozzle 42 and the inner ring receiving jig 21. Next, the drive motor 31 is driven in the rotation mechanism 30 to rotate the roller 32, and the outer ring 102 is rotated around the axis L by the rotational force. Finally, in the air injection mechanism 40, compressed air is supplied from the compressor 41 to the air nozzle 42, and the compressed air is uniformly injected from the annular air injection port 42c over the entire annular space 104 of the ball bearing. At this time, it is not necessary to set the injection pressure of the compressed air finely.

  FIG. 5 is a schematic diagram showing the action during air injection.

  As shown in the figure, in the ball bearing 100, since the distance between adjacent balls is different as described above, there is a difference in the flow rate and flow velocity of the compressed air flowing between the balls. That is, since the distance between the balls 103A and 103B is long, the flow rate of the compressed air passing between the balls is large and the flow velocity is fast, as indicated by the arrow a in the figure. On the other hand, since the distance between the balls 103B and 103C is shorter than that, the flow rate of the compressed air passing between the balls is small and the flow velocity is slow, as indicated by the arrow a in the figure.

As described above, when a difference occurs in the flow rate and flow velocity of the compressed air passing between the balls, a difference in suction force is generated between the balls 103A and 103B and between the balls 103B and 103C. At this time, according to Bernoulli's theorem, the attraction forces between adjacent balls try to balance each other. 103B and 103C move by rolling in the circumferential direction (left and right in the figure) so that the distance between all the balls becomes uniform under the influence of the suction force. That is, in the example shown in the drawing, the suction force F ₁ generated between the center ball 103B and the left ball 103A is larger than the suction force F ₂ generated between the center ball 103B and the right ball 103C. center of the ball 103B is attracted towards the left side of the ball 103A more by a large suction force _{F 1.}

  FIG. 6 is an overall view showing the ball bearing after the ball equalizing method is applied, and FIG. 7 is an enlarged view of the vicinity of the ball in the bearing.

As described above, in the present embodiment, by adopting the annular injection port structure, the compressed air is uniformly injected over the entire annular space 104 of the ball bearing. Thus, since the attraction force generated between all the balls as shown to try to keep the balance with each other, the result is all the attraction force F ₃ stabilizes in a state of balanced. In this way, all the balls 103A, 103B, 103C,... Are finally arranged at equal intervals on the circumference in the annular space 104.

  In the ball distribution method as described above, it is preferable to inject compressed air while fixing the inner ring 101 and rotating the outer ring 102 around the axis L as in this embodiment. The reason is that when the outer ring 102 rotates, the frictional force generated on the contact surface between the outer ring 102 and the ball 103 is reduced, and the ball 103 is likely to roll in the circumferential direction. Therefore, when the compressed air is jetted while rotating the outer ring 102, the balls 103 move smoothly. Therefore, the time until the balls 103 are arranged at equal intervals is shortened, and the uniform arrangement can be made efficiently.

  The present invention is not limited to the above-described embodiments, and various modifications such as the following are possible. For example, with respect to the rotation mechanism 30, the inner ring 101 is fixed and the outer ring 102 is rotated. However, the inner ring 101 and the outer ring 102 may be moved relatively, and conversely, the outer ring 102 is fixed. The inner ring 101 may be rotated. In addition, regarding the air injection mechanism 40, compressed air is injected vertically downward from the upper end surface side of the ball bearing 100 with respect to the annular space 104. However, the ball bearing 100 is provided with an axial center L between the inner ring 101 and the outer ring 102. Is supported in a direction perpendicular to the installation surface, on the contrary, the same effect can be obtained even if the compressed air is jetted vertically upward with respect to the annular space 104 from the lower end surface side.

1 is an overall view showing a ball equidistant arrangement device according to the present invention. The top view which looked at the air nozzle from the bottom face. The whole figure which shows the ball bearing before a ball | bowl is arranged at equal intervals. The elements on larger scale of the ball bearing of FIG. The schematic diagram which shows the effect | action at the time of air injection. The whole figure which shows the ball bearing after a ball | bowl is arranged at equal intervals. The elements on larger scale of the ball bearing of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Ball equal arrangement device 20 Support mechanism 21 Inner ring receiving jig 30 Rotating mechanism 31 Drive motor 32 Roller 40 Air injection mechanism 41 Compressor 42 Air nozzle 43 Air hose 100 Ball bearing 101 Inner ring 102 Outer ring 103 Ball 104 Toroidal space

Claims (5)

In a ball bearing in which a plurality of balls are incorporated in an annular space between an inner ring and an outer ring arranged coaxially, the plurality of balls are arranged at equal intervals on a circumference in the annular space. ,
Supporting means for supporting the ball bearing in a direction in which the axial centers of the inner ring and the outer ring are perpendicular to the installation surface;
And an air ejection means for uniformly injecting the compressed air over the entire area of the ball bearing in the axial direction of the one end face side from the other annular toward the end face of the injection port from the annular space,
Due to the difference in distance between adjacent balls in the plurality of balls, a difference occurs in the flow rate and flow velocity of the compressed air flowing between adjacent balls, resulting in a difference in suction force between adjacent balls. And at this time, because the attractive force between adjacent balls tries to balance each other according to Bernoulli's theorem, the balls are affected by the attractive force so that the distance between all the balls becomes uniform. A ball equidistant arrangement device in a ball bearing , wherein the balls are finally arranged at equal intervals on the circumference in the annular space by rolling and moving in the circumferential direction .   The ball equal interval in the ball bearing according to claim 1, further comprising: a fixing means for fixing the inner ring of the ball bearing; and a rotating means for rotating the outer ring of the ball bearing about its axis. Array device.   The ball equal interval in the ball bearing according to claim 1, further comprising: a fixing unit that fixes the outer ring of the ball bearing; and a rotating unit that rotates the inner ring of the ball bearing about its axis. Array device. In a ball bearing in which a plurality of balls are incorporated in an annular space between an inner ring and an outer ring arranged coaxially, the plurality of balls are arranged at equal intervals on a circumference in the annular space. ,
The ball bearing is supported in such a manner that the shaft centers of the inner ring and the outer ring are perpendicular to the installation surface. Compressed air is uniformly sprayed from the injection port over the entire annular space ,
During the injection, the distance between adjacent balls in the plurality of balls is different, resulting in a difference in the flow rate and flow velocity of the compressed air flowing between the adjacent balls, resulting in suction between the adjacent balls. Due to the difference in force and the Bernoulli's theorem, the attractive force between adjacent balls tries to balance each other, so the ball is affected by the attractive force and the distance between all the balls The balls are arranged at equal intervals on the circumference in the annular space by rolling and moving in the circumferential direction so that the ball is uniform. . 5. The ball bearing according to claim 4, wherein either one of an inner ring and an outer ring of the ball bearing is fixed, and the compressed air is injected while the other is rotated around its axis. Method.

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