JP2014145689A - Method for measuring ball circumscription distance of cage for rolling bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for measuring a ball circumscription distance of a cage for a rolling bearing in which measurement with a ball pressed against an inner diameter side of the cage can be simplified and performed in a short time.SOLUTION: A method for measuring a ball circumscription distance of a cage for a rolling bearing uses a measurement auxiliary tool 6 provided with standard balls 60 having the same outer diameter as that of balls 4, and a measurement jig 8 provided with a circular doughnut-shaped plate 80. The measurement jig 8 is provided with a cylindrical part 81 and a through hole 83. The method includes: a fixing step of fixing the standard balls 60 while pressing them against an inner diameter side of a cage 5 such that each of the standard balls 60 is mounted inside each pocket 50 and each of weights 62 hangs down due to its own weight downward in the vertical direction in the through hole 83 with an inner circumferential edge of the cylindrical part 81 as a supporting point; and a measuring step of measuring a ball circumscription distance D1 which is a maximum outer diameter circumscribing a pair of the standard balls 60 opposed to each other with an axis line C1 of the cage 5 held therebetween. The steps are sequentially implemented to perform measurement. In the measurement jig, a portion between a connecting point 61a of a connection member 61 to the standard ball 60 and the supporting point is set so as to be orthogonal to the vertical direction.

Description

  The present invention relates to a ball circumscribing that is the maximum outer diameter of a pair of balls that are opposed to each other with an axis between them. The present invention relates to a method for measuring an inter-distance.

  For example, a rolling bearing that supports a rotating shaft includes an inner ring that is externally fitted to the rotating shaft, an outer ring that is coaxially disposed with the inner ring, a plurality of balls that are circumferentially disposed in an annular space between the inner and outer rings, And a cage for holding the roll freely. This cage is formed by injection molding a slippery resin such as polyamide and has a pocket for holding a ball, and is configured as a ball guide type. The ball is put into the pocket from the outside in the radial direction, and a slight pocket gap is provided between the outer peripheral surface of the ball and the inner peripheral surface of the pocket, and is held so as to be able to roll in the pocket.

  Since the above rolling bearing is smoothly lubricated and rotated at a low torque, the size of the pocket gap needs to be appropriate. If the pocket clearance is too small, sufficient lubricant cannot be taken in between the outer peripheral surface of the ball and the inner peripheral surface of the pocket, resulting in an increase in rotational torque and abnormal wear of the ball and cage. . On the other hand, if the size of the pocket gap is too large, the cage vibrates or abnormal noise called cage noise occurs in a high-speed rotation range or the like.

  Therefore, when a mold for injection molding of the cage is newly manufactured, the first product inspection of the cage molded by the new mold is performed. As one of the initial product inspections, the following inspections are performed. In a state where a ball is put in the pocket of the cage and the ball is pressed against the inner diameter side of the cage, the distance between the ball circumscribing, which is the maximum outer diameter of a pair of balls facing each other across the axis of the cage, is measured. The size of the pocket gap is obtained from the measurement result, and it is inspected whether the size is within a predetermined range. In order to measure the distance between the balls, the ball can be pressed against the inner diameter of the cage by using a clay fixing method in which the balls and pockets are fixed with clay, or by placing an electromagnet on the axis of the cage and using a material such as iron. There is an electromagnet system that attracts magnetic balls. (For example, see Patent Document 1)

JP 2004-347545 A

  However, in the above-described method of pressing the ball against the inner diameter side of the cage, the clay fixing method is very troublesome because it is fixed manually with clay, and the operation time is long. In addition, since the electromagnet system has a large structure, the cost is increased and the preparation time is increased. Therefore, the method of measuring the distance between the ball circumscribing of the rolling bearing cage has been a problem in that the measurement in a state where the ball is pressed against the inner diameter side of the cage is simplified and performed in a short time.

  The present invention has been made in order to solve the above-described problems, and can simplify the measurement in a state where the ball is pressed against the inner diameter side of the cage, and can be performed in a short time. An object of the present invention is to provide a method for measuring the distance between ball circumscribing of a vessel.

  In order to solve the above-mentioned problems, the structural feature of the method for measuring the ball circumscribing distance of the rolling bearing cage according to claim 1 is formed by a hole penetrating in the radial direction in the rolling bearing cage. A method of measuring a ball circumscribing distance, which is the maximum outer diameter of a pair of the balls facing each other across an axis, with the balls held in a plurality of pockets so as to freely roll, and the outer diameter is the same as the balls Uses a measuring aid with a weight connected to a standard ball via a connecting member, and a measuring jig equipped with a donut-shaped disk part on which the rolling bearing retainer is placed with the axis as the vertical direction during measurement The measuring jig includes a cylindrical portion formed to extend from the inner diameter end of the disc portion to one side in the axial direction, and a through hole penetrating in the axial direction around the axis, and the cylindrical portion The above-mentioned measuring jig with the vertical direction above the above-mentioned rolling bearing cage Placing the standard ball in the pocket, and placing the weight hanging downward in the vertical direction by its own weight in the through hole with the inner peripheral end of the cylindrical portion as a fulcrum; A fixing step of pressing and fixing to the inner diameter side of the rolling bearing cage, and a measuring step of measuring a distance between the ball circumscribing that is the maximum outer diameter of the pair of standard balls facing each other across the axis of the rolling bearing cage And the measurement jig is configured to measure the connection from the connection point of the connection member to the standard ball when the standard ball is fixed to the rolling bearing retainer by the fixing step. That is, the part up to the fulcrum is set to be orthogonal to the vertical direction.

  According to the method for measuring the ball circumscribing distance of the rolling bearing retainer according to claim 1, the standard ball is orthogonal to the axis on the inner diameter side of the rolling bearing retainer by using the measurement auxiliary tool and the measuring jig. Since the pressed and fixed state can be easily created, the measurement of the ball circumscribing distance in this state can be simplified and performed in a short time.

  ADVANTAGE OF THE INVENTION According to this invention, the method of measuring the ball | bowl circumscribing distance of the rolling bearing retainer which can perform the measurement in the state which pressed the ball on the inner diameter side of the retainer in a short time can be provided.

It is sectional drawing of the axial direction of the rolling bearing which uses the holder | retainer which is one Embodiment of this invention as a component. It is AA sectional drawing of the cage assembly shown in FIG. It is a side view which shows the structure which measures the ball circumscribing distance of the holder | retainer which is one Embodiment of this invention. It is a flowchart which shows the process of measuring the ball | bowl circumscribing distance of the holder | retainer which is one Embodiment of this invention. It is a figure which shows a measurement auxiliary tool. It is a figure which shows the state which mounted the holder assembly in the measuring jig shown in FIG. It is BB sectional drawing of FIG.

DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment in which a method for measuring a ball circumscribing distance of a rolling bearing cage according to the present invention will be described with reference to the drawings.
FIG. 1 is a sectional view in the axial direction of a rolling bearing 1 having a cage 5 (roller bearing cage) according to an embodiment of the present invention as a component. 2 is a cross-sectional view of the cage assembly CA shown in FIG. This will be described with reference to FIGS.

  The rolling bearing 1 rolls a fixed outer ring 2, an inner ring 3 that rotates freely with respect to the outer ring 2, a plurality of balls 4 that are arranged in an annular space between the inner and outer rings, and a ball 4. And an annular cage 5 that is freely held. The cage 5 is formed by injection molding a slippery resin such as polyamide, has a pocket 50 formed by a hole penetrating in the radial direction, and is configured as a ball guide type. The ball 4 is made of bearing steel, and is inserted into the pocket 50 from the outside in the radial direction. A predetermined pocket gap SP is provided between the outer peripheral surface of the ball 4 and the inner peripheral surface of the pocket 50 and is held so as to be able to roll. .

  When a mold for injection molding is newly manufactured, the cage 5 performs an initial inspection of the cage 5 that has been injection molded with the new mold. As one of the initial product inspections, it is inspected whether the size of the pocket gap SP is within a predetermined range. For this inspection, a pair of balls facing each other across the axis C1 in the cage assembly CA in which the ball 4 is inserted into the pocket 50 of the cage 5 and the ball 4 is pressed against the inner diameter side of the cage 5. The ball circumscribed distance D1, which is the maximum outer diameter of 4, is measured.

FIG. 3 is a side view showing a configuration for measuring the ball circumscribed distance D1 of the cage 5 according to the embodiment of the present invention. This will be described with reference to FIG.
The tool microscope 7 for measuring the ball circumscribed distance D1 (shown in FIG. 2) of the cage 5 includes a main body 70 installed on the floor, and a table 71 provided on the upper surface of the main body 70 for placing an object to be measured. A wall 72 provided in the vertical direction (vertical direction) from the rear part of the main body 70 and an optical lens unit 73 provided on the upper part of the wall 72 for optically measuring the position of the object to be measured. The table 71 further includes an X-axis that is the left-right direction in the figure, a Y-axis direction that is orthogonal to the X-axis and the front-rear direction in the figure, and an R-axis that is rotatable in the horizontal direction. . The optical lens unit 73 is movable in the Z-axis direction, which is the vertical direction in the figure, perpendicular to the X-axis and the Y-axis.

  In measuring, a cage assembly CA1 (details will be described later) using a measurement auxiliary tool 6 having a standard ball 60 having the same outer shape as the ball 4 is used instead of the cage assembly CA. Further, a donut-shaped measuring jig 8 (details will be described later) which is a jig for placing the cage assembly CA1 is used. The measuring jig 8 on which the cage assembly CA1 is placed is placed on the table 71, and the ball circumscribed distance D1 is measured.

Next, a method for measuring the ball circumscribed distance D1 of the cage 5 will be described with reference to FIGS.
FIG. 4 is a flowchart showing a process of measuring the ball circumscribing distance D1 of the cage 5 according to the embodiment of the present invention. FIG. 5 is a diagram showing the measurement auxiliary tool 6. FIG. 6 is a view showing a state where the cage assembly CA1 is placed on the measuring jig 8 shown in FIG. 7 is a cross-sectional view taken along the line BB in FIG.

First, the measurement auxiliary tool 6 and the measurement jig 8 are prepared (step S1 in FIG. 4).
The measurement auxiliary tool 6 shown in FIG. 5 includes a standard ball 60, a metal weight 62, and a connection member 61 having one end connecting point 61 a connected to the standard ball 60 and the other end connected to the weight 62. The As a material of the standard ball 60, for example, metal or ceramic is used. As a material of the connection member 61, for example, carbon fiber having a high tensile elastic modulus is used.

  A measuring jig 8 shown in FIG. 6 includes a disc portion 80 having a step, a small-diameter cylindrical portion 81 (cylindrical portion) formed to extend from the inner diameter end of the disc portion 80 to one side in the axial direction, and a disc. A large-diameter cylindrical portion 82 formed to extend from the outer diameter end of the portion 80 to the other in the axial direction, and a through hole 83 penetrating in the axial direction around the axis C1. The disc portion 80 includes a thick portion 80a formed on the inner diameter side, and a thin portion 80c that is appropriately thinner than the thick portion 80a and is continuous with the thick portion 80a and the stepped surface 80b.

Next, the cage 5 is placed on the measuring jig 8 (step S2 in FIG. 4).
As shown in FIG. 6, the cage 5 is placed on the measuring jig 8 with one end thereof being fitted to the thin portion 80 c and the inner circumference being fitted into the stepped surface 80 b. Step S2 corresponds to the mounting process of the present invention.

Next, the measurement auxiliary tool 6 is attached to the pocket 50 (step S3 in FIG. 4).
As shown in FIG. 6 and FIG. 7, each measurement auxiliary tool 6 is mounted with each standard ball 60 mounted in each pocket 50, and each connection member 61 is a fulcrum that is the inner peripheral end of the small-diameter cylindrical portion 81. Each weight 62 passes through the position 84 as a fulcrum and hangs downward in the vertical direction by its own weight in the through hole 83. Here, the measuring jig 8 is set so that the portion from the connection point 61a of the connection member 61 to the fulcrum position 84 is orthogonal to the vertical direction. As a result, the standard ball 60 is pressed and fixed to the inner diameter side of the cage 5 perpendicular to the axis C1. Thereby, the cage assembly CA1 is formed. Step S3 corresponds to the fixing step of the present invention.

  Next, the cage assembly CA1 is placed on the table 71 of the tool microscope 7 (shown in FIG. 3) with the direction of the axis C1 as the Z axis. Then, by moving the table 71 in the X, Y, and R axis directions and moving the optical lens portion 73 in the Z axis direction, the ball circumscribed distance D1 shown in FIG. 7 is measured (step S4 in FIG. 4). ). In this way, the cage assembly CA1 has a maximum outer diameter of the pair of balls 4 facing each other across the axis C1, that is, a ball circumscribing that is a distance between the outermost diameter end P1 and the outermost diameter end P2. The distance D1 is measured. Subsequently, the ball circumscribing distance D1 of the pair of balls 4 that the adjacent balls 4 face with the axis C1 interposed therebetween is measured, and the ball circumscribing distance D1 of all the pairs of balls 4 is measured. Here, the measurement by the tool microscope 7 is performed by observing, for example, the outermost diameter end P <b> 1, which is an end surface on the outer diameter side of the ball 4, with the optical lens unit 73. Step S4 corresponds to the measurement process of the present invention.

  According to the method of measuring the ball circumscribed distance D1 of the cage 5 of the present embodiment, the standard ball 60 is placed on the axis C1 on the inner diameter side of the cage 5 by using the measurement auxiliary tool 6 and the measurement jig 8. Since a state of being orthogonally pressed and fixed can be easily created, measurement of the ball circumscribing distance D1 in this state can be simplified and performed in a short time.

  Further, according to the method of measuring the ball circumscribed distance D1 of the cage 5 of the present embodiment, the measuring jig 8 is fixed so that the standard ball 60 is pressed and fixed to the inner diameter side of the cage 5 at right angles to the axis C1. Is set, it is possible to accurately measure the ball circumscribed distance D1.

In addition, this invention is not limited to this embodiment, In the range which does not deviate from the summary of this invention, it can implement with a various form.
In the present embodiment, the ball is the ball 4, but is not limited thereto, and may be applied to a configuration of a cylindrical roller, for example.

  In the present embodiment, the ball 4 is a magnetic bearing steel. However, the present invention is not limited to this, and the measurement method does not use magnetism. For example, the ball is made of a nonmagnetic ceramic. You may apply to a structure.

  In this embodiment, the cage 5 is made of a non-magnetic resin. However, the present invention is not limited to this, and the measurement method is not affected by magnetism. For example, the cage is made of magnetic bearing steel. You may apply to the structure which becomes.

  In the present embodiment, the measurement means is the tool microscope 7 including the optical lens unit 73. However, the present invention is not limited to this. For example, the present invention is applied to the configuration of a measuring instrument using a camera or a measuring instrument using a laser. May be.

1: rolling bearing, 2: outer ring, 3: inner ring, 4: ball, 5: cage (rolling bearing cage), 6: measuring aid, 7: tool microscope, 8: measuring jig, 50: pocket, 60: Standard ball, 61: Connection member, 61a: Connection point, 62: Weight, 70: Main body, 71: Table, 72: Wall, 73: Optical lens part, 80: Disc part, 80a: Thick part, 80b : Stepped surface, 80c: Thin-walled part, 81: Small-diameter cylindrical part (cylindrical part), 82: Large-diameter cylindrical part, 83: Through-hole, 84: Position of fulcrum, C1: Axis, CA, CA1: Cage assembly, D1 : Ball circumscribed distance, P1, P2: Outermost diameter end, SP: Pocket clearance

Claims (1)

A ball circumscribing distance which is the maximum outer diameter of a pair of the balls facing each other across the axis is held in a plurality of pockets formed by holes penetrating in the radial direction in a rolling bearing cage. A method of measuring,
A measurement auxiliary tool in which a weight is connected to a standard ball having the same outer diameter as the ball via a connecting member, and a donut-shaped disk portion in which the rolling bearing retainer is placed with the axis as the vertical direction during measurement Using a measuring jig with
The measuring jig includes a cylindrical portion formed to extend from the inner diameter end of the disc portion to one side in the axial direction, and a through hole penetrating in the axial direction around the axis.
A mounting step of mounting the rolling bearing retainer on the measuring jig with the cylindrical portion positioned vertically above;
The standard ball is mounted in the pocket, the weight hangs down in the vertical direction due to its own weight in the through hole with the inner peripheral end of the cylindrical portion as a fulcrum, and the standard ball is placed on the inner diameter side of the rolling bearing cage Fixing process to press against and fix,
Measuring by measuring the ball circumscribing distance which is the maximum outer diameter of the pair of standard balls facing each other across the axis of the rolling bearing retainer,
In the measuring jig, when the standard ball is fixed to the rolling bearing retainer by the fixing step, a portion from the connection point of the connection member to the standard ball to the fulcrum is perpendicular to the vertical direction. A method for measuring a ball circumscribing distance of a rolling bearing cage characterized by being set as follows.

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