JP2016109181A - Coating device for high viscous fluid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem on increase of initial torque of a bearing 1 found in a case when grease is applied to the bearing 1 by using a conventional dispenser, as the grease after coating is pressed to a cage and balls and brought into contact therewith, when a seal and a shield plate are press-fitted in a post-process.SOLUTION: In a coating device composed of a syringe filled with a high-viscous fluid, and a hollow needle attached to one end of the syringe, and discharging the high-viscous fluid through the needle to be applied to a prescribed region of a workpiece, the needle has a recessed portion recessed toward a center of the cross-sectional shape at a part of the cross-sectional shape in a plane orthogonal to a longitudinal direction, at its tip portion. Thus a recessed portion is formed also on the grease discharged from the needle, and the grease is applied in a state that the recessed portion is faced to a cage and balls, which prevents the contact of the grease with the cage and the balls.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an apparatus for applying a highly viscous fluid such as grease or adhesive to a workpiece.

  In the manufacturing process of a machine, an operation of applying a lubricant such as an adhesive or grease to a part (hereinafter referred to as a workpiece) at a predetermined position is performed. For example, in the process of attaching a window glass of an automobile, the adhesive is discharged while moving the dispenser along the outer edge of the window glass, and a minimum amount of adhesive is applied so that it does not protrude when attached to the vehicle body. It is applied (see Patent Document 1). Further, in the production of the rolling bearing 1, it is necessary to apply a specified amount of grease to a predetermined part of the bearing ring or the cage, and equipment using various application methods is used (see Patent Document 2). .

JP 2011-55610 A JP 2004-286061 A

  In the production of rolling bearings, it is necessary to apply grease accurately in a predetermined space of the bearing ring, particularly in a small-diameter bearing. In a conventional coating apparatus, a method using an annular slit nozzle, a method using a dispenser equipped with a needle nozzle having a circular cross section, and the like have been adopted.

  However, when grease is applied by the conventional application method, the upper part of the grease after application is rounded. Therefore, especially in a small-diameter bearing, when the seal or shield plate is press-fitted in the subsequent process, There has been a problem that the bearings are crushed in contact with the grease, and the grease touches the balls and the cage to increase the rotational torque of the bearing to an allowable value or more. Further, there is a problem that the grease crushed by the seal or the like enters the seal groove of the bearing outer ring, and the grease leaks out from the seal groove when the seal or the like is press-fitted.

  The present invention has been made in view of the above-mentioned problems, and its purpose is to make the upper part of the grease after application a flat shape so that the grease and the seal can be contacted even when a seal or a shield plate is press-fitted. Therefore, an object of the present invention is to provide a grease application method and an application device that can prevent an increase in rotational torque of a bearing.

The object of the present invention is achieved by the following constitution.
(1) In a coating apparatus that includes a syringe filled with a high-viscosity fluid and a hollow needle attached to one end of the syringe, the high-viscosity fluid is discharged through the needle, and is applied to a predetermined part of a workpiece. The needle has a concave portion in which a part of a cross-sectional shape in a plane orthogonal to the longitudinal direction of the tip portion is recessed toward the center of the cross-sectional shape, and a flat portion facing the concave portion. Fluid application device.
(2) A high-viscosity fluid coating apparatus including at least a work table on which a work is rotatably mounted and a control device for controlling the work table, and discharging the high-viscosity fluid from the needle while rotating the work. And applying the high-viscosity fluid to a predetermined part of the workpiece.
(3) The needle includes a concave portion in which a part of a cross-sectional shape in a plane orthogonal to the longitudinal direction of the tip portion is recessed toward the center of the cross-sectional shape, and the flat portion facing the concave portion. The high-viscosity fluid coating apparatus according to claim 2, wherein the concave portion is disposed in a direction orthogonal to a direction of relative movement between the needle and the workpiece.
(4) The height according to any one of claims 1 to 3, wherein the cross-sectional shape of the needle is a substantially rectangular shape having at least one side of the concave portion and the flat portion facing the concave portion. Application device for viscous fluid.
(5) The cross-sectional shape of the needle is a substantially oval shape having the concave portion on one of two connecting two semicircles and the flat portion on the other. The high-viscosity fluid coating apparatus according to any one of the above.

  According to the coating method and the coating apparatus according to the present invention, the grease is applied with a needle while rotating the workpiece, so that the upper part of the grease after application becomes a flat shape. It is possible to prevent the grease from coming into contact with them and thus increasing the rotational torque of the bearing. Also,

It is a perspective view which shows the structure of the grease application apparatus 10 which concerns on this invention. It is a perspective view which shows the workpiece | work W (bearing 1) used as the object of grease application. 3 is an outline diagram showing the configuration of the dispenser 20. It is a trihedral view showing the tip shape of the needle 21 according to the first embodiment of the present invention. It is a figure explaining the example of grease application concerning a 1st embodiment of the present invention. It is sectional drawing in the XY plane of the grease in FIG. It is sectional drawing in the XZ plane of the grease in FIG. It is a 3rd view which shows the front-end | tip shape of the needle 210 which concerns on 2nd Embodiment of this invention.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings. As an example of a highly viscous fluid to be applied, a grease for lubricating a bearing will be described as an example. As shown in FIG. 2, the rolling bearings 1 that are the workpieces W to be coated with grease are a plurality of inner rings 2 and outer rings 3, and a plurality of them arranged at equal intervals in the circumferential direction in a space sandwiched between the raceway surfaces 4 and 4. Ball 5 and a cage 6 for maintaining the distance between the balls 5.

  As shown in FIG. 1, the grease application apparatus 10 is provided with a work table 11 that is rotated with a work W placed thereon. The work table 11 can be rotated by a motor 12 and a spindle 13. A dispenser 20 for discharging grease is installed above the work table 11. The dispenser 20 is supported by the two linear motion mechanisms 27 and 28 so that the dispenser 20 can move in the radial direction and the axial direction of the workpiece W, and grease can be discharged to an optimum position according to the size of the workpiece W.

  The dispenser 20 has a function of discharging a predetermined amount of grease. In general, the operation mode of the dispenser 20 can be roughly classified into an air type and an electric type. In the air type, grease is contained in a syringe 22 provided with a hollow needle 21 at the tip, and the upper surface of the grease is pressurized by a piston 23. The air type further includes a type in which high-pressure air directly acts on the back surface of the piston 23 and a type in which the piston 23 is pushed by an air cylinder 24 (see FIG. 3).

  Some types of electric dispensers drive a pump with a motor to discharge grease, and others use a screw mechanism driven by a motor to advance the piston and pressurize the grease to discharge from the needle. The electric type is more expensive than the air type, but is often expensive. Therefore, the operation type of the dispenser 20 is determined in consideration of necessary accuracy and cost.

  The dispenser 20 may be provided with a large grease tank 24 and a grease pump 25 for supplying the grease to the dispenser 20 so that a continuous discharge operation can be performed on a large number of workpieces W. The grease stored in the grease tank 25 is sent to the syringe 22 by the grease pump 26 when the grease in the syringe 22 decreases (see FIG. 4).

  Next, the application operation of the high-viscosity fluid application apparatus according to the present invention will be described. The workpiece W is placed on the workpiece table 11 by a transfer device (not shown) so that the center of the workpiece W and the rotation center of the workpiece table 11 are concentric.

  And the front-end | tip of the needle 21 is moved to the position which should be apply | coated by the linear motion mechanisms 27 and 28. FIG. The dimensions and application position of the workpiece W are registered in advance in the control device 30 (not shown), and the needle 21 can be automatically moved to an appropriate position by inputting the model number of the workpiece W.

  When the movement of the needle 21 is completed, the motor 12 rotates and the workpiece W placed on the workpiece table 11 rotates. When the rotation of the work table 11 reaches a constant speed, the dispenser 20 starts to discharge grease, and after the work W has made exactly one rotation, the discharge is stopped. Thereafter, the work table 11 stops, and the transfer device transfers the work W to a subsequent process.

  The high-viscosity fluid coating apparatus according to the present invention is characterized in that the cross section perpendicular to the discharge direction of the needle 21 has a substantially rectangular shape having a concave portion 21a recessed in the central direction of the cross section, as shown in FIG. The direction of the cross section is such that the pair of sides are orthogonal to the relative movement direction D of the needle 21 and the workpiece W as viewed from above, and the recess 21a is disposed on the upstream side in the relative movement direction D of the workpiece W. . The opposite side of the recess 21a has a linear shape. The angle of the needle 21 as viewed from the radial direction of the workpiece W is generally parallel to the rotation axis of the workpiece table 11.

  Next, the effect of having such a cross-sectional shape will be described. When grease is discharged from the needle 21 while rotating the workpiece W, the grease discharged downward in the vertical direction is applied to the position where the workpiece W is applied, in the example shown in FIG. 7, the axial direction of the track surface 3b on the inner peripheral surface 3a of the outer ring 3. It adheres to the cylindrical surface portion 3c provided on the side and moves in the horizontal direction.

  In the XYZ coordinate system shown in FIG. 5, the position where this grease is applied is the origin, the X axis is in the radial direction of the workpiece W, the Y axis is in the circumferential direction of the workpiece W, and the Z axis is in the workpiece base 11. In this coordinate system, when the grease is discharged from the needle 21, the cross-sectional shape of the grease in the XY plane is a substantially rectangular shape similar to that of the needle 21.

  The grease discharged from the needle 21 adheres to the cylindrical surface portion 3c provided on the inner surface of the outer ring 3 at a position corresponding to the origin of the XYZ coordinate system and moves in the Y-axis direction. At this time, the above-mentioned oval cross-sectional shape of the grease is converted into a cross-sectional shape in a plane parallel to the XZ plane. That is, the cross section of the grease attached to the cylindrical surface portion 3 c in the XZ plane has a substantially rectangular shape similar to the cross section of the needle 21. At this time, the recess 21a faces the ball 5 and the cage 6 of the bearing 1 with a gap.

  When the discharge speed V1 from the needle 21 and the relative speed V2 between the needle 21 and the outer ring 3 are equal, the cross-sectional shape of the grease in the cylindrical surface portion 3c is substantially equal to the cross-sectional shape of the needle 21, but V1 is smaller than V2. In this case, the grease attached to the cylindrical surface portion 3c has a rectangular shape with a small thickness with respect to the rotation axis direction of the workpiece W. By arbitrarily setting the speed difference between V1 and V2, it is possible to control the volume and cross-sectional shape of the grease adhered to the cylindrical surface portion 3c and the gap amount between the recess 21a, the ball 5 and the cage 6.

  A space in which grease can be enclosed in the workpiece W is a space surrounded by the inner ring 2 and the outer ring 3, the plurality of balls 5, and a seal or shield. Therefore, in order to fill the space with grease to the maximum extent, the cross-sectional shape of the grease after filling in the XZ plane is close to the shape of the space surrounded by the inner ring 2 and the outer ring 3, the plurality of balls 5, and the seal or shield. It is desirable. On the other hand, since the needle 21 according to the present invention has a concave portion 21a on one side of a substantially rectangular cross section, the amount of grease can be increased, and the concave portion 21a can be connected to the ball 5 and the cage 6 of the bearing 1. Can be prevented, and an increase in the initial torque of the bearing 1 can be prevented. It is desirable that the curvature on the inner peripheral side of the recess 21a is equal to or larger than the radius of curvature of the ball 5 of the bearing 1. Since the curvature of the inner peripheral side of the recess 21a is smaller than the curvature radius of the ball 5 of the bearing 1, the grease and the ball 5 are likely to come into contact with each other, which is not preferable.

(Second Embodiment)
FIG. 8 is a diagram showing a second embodiment of the present invention. In this embodiment, a cross-sectional shape of the needle, which is a difference from the first embodiment, will be described. Other components of the present invention are the same as those in the first embodiment, and thus description thereof is omitted.
As shown in FIG. 7, the cross-sectional shape of the needle 210 is an oval shape in which two semicircles are connected by two lines, and one of the two lines has a recess 210a recessed in the center of the cross section. This is different from the first embodiment. When the bearing 1 that is the workpiece W is reduced, the gap between the inner ring 2 and the outer ring 3 is also reduced, and the necessary dimensions of the needle 210 are also required to be reduced. In order to form a metal tube having a square cross section with a length of several millimeters on one side, a high technique is required, which may increase the manufacturing cost. On the other hand, since the needle 210 according to the present embodiment can be manufactured by crushing a metal tube having a circular cross section, an increase in manufacturing cost can be suppressed.

1 (W) Bearing 2 Inner ring 3 Outer ring 3a Outer ring inner peripheral surface 3b Outer ring raceway surface 3c Cylindrical surface portion (outer ring inner periphery)
DESCRIPTION OF SYMBOLS 4 Track surface 5 Ball 6 Cage 10 Grease application apparatus 11 Work stand 12 Motor 13 Spindle 20 Dispenser 21,210 Needle 21a, 210a Recess 22 Syringe 23 Piston 24 Air cylinder 25 Grease tank 26 Grease pump 26

Claims (5)

In a coating apparatus that includes a syringe filled with a high-viscosity fluid and a hollow needle attached to one end of the syringe, the high-viscosity fluid is discharged through the needle, and is applied to a predetermined part of the workpiece. Application of a highly viscous fluid, characterized in that a part of a cross-sectional shape in a plane perpendicular to the longitudinal direction of the tip part has a concave part that is recessed toward the center of the cross-sectional shape and a flat part that faces the concave part. apparatus. A high-viscosity fluid coating apparatus including at least a work table on which a work is rotatably mounted and a control device for controlling the work table, and discharging the high-viscosity fluid from the needle while rotating the work. A high-viscosity fluid coating apparatus that applies the high-viscosity fluid to a predetermined part of The needle includes a concave portion in which a part of a cross-sectional shape in a plane orthogonal to the longitudinal direction of the tip portion is recessed toward the center of the cross-sectional shape, and the flat portion facing the concave portion. The device for applying a highly viscous fluid according to claim 2, wherein the needle is disposed in a direction orthogonal to a direction of relative movement between the needle and the workpiece. The high-viscosity fluid according to any one of claims 1 to 3, wherein the cross-sectional shape of the needle is a substantially rectangular shape having at least one side of the concave portion and the flat portion facing the concave portion. Coating device.   The cross-sectional shape of the needle is a substantially oval shape having the concave portion on one of two connecting two semicircles and the flat portion on the other. The high-viscosity fluid coating apparatus according to one item.

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