JP2016080013A - High viscous fluid application device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem that in a case where grease is applied to a bearing by using a conventional dispenser, an upper part of the applied grease is rounded and thus contacts with a seal and a shield plate when the seal or the shield plate is press-fitted in a post-process.SOLUTION: An application device comprises: a syringe filled with a high viscous fluid; and a hollow needle attached to one end of the syringe. The application device discharges the high viscous fluid through the needle to apply the high viscous fluid to a predetermined position of a workpiece. A cross section of a tip part of the needle has a substantially square shape on a plane perpendicular to a longitudinal direction.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 manufacture of rolling bearings, it is necessary to apply a specified amount of grease to a predetermined part of a race or 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. A high-viscosity fluid coating apparatus, wherein the needle has a polygonal cross-sectional shape in a plane perpendicular to the longitudinal direction at the tip.
(2) The applicator according to claim 1, wherein a cross-sectional shape of the needle is substantially square.
(3) A coating device comprising a syringe filled with a high-viscosity fluid and a hollow needle attached to one end of the syringe, and discharging the high-viscosity fluid through the needle, and a work table on which the work is rotatably mounted A high-viscosity fluid application apparatus including at least a control device for controlling the high-viscosity fluid, and discharging the high-viscosity fluid from the needle while rotating the work to apply the high-viscosity fluid to a predetermined part of the work A coating apparatus characterized by:
(4) The needle has a substantially square cross-sectional shape in a plane perpendicular to the longitudinal direction at the tip, and at least a pair of sides of the substantially square is in a direction perpendicular to the direction of relative movement between the needle and the workpiece. The coating apparatus according to claim 3, wherein the coating apparatus is arranged.

  According to the coating method and the coating apparatus according to the present invention, since the upper part of the grease after application has a flat shape, when the seal or the shield plate is press-fitted, the grease does not come into contact therewith, and therefore the rotational torque of the bearing is reduced. It is possible to prevent the increase.

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 bearing W used as the object of grease application. 3 is an outline diagram showing the configuration of the dispenser 20. It is a 3rd view which shows the front-end | tip shape of the needle 21 which concerns on this invention. It is a figure explaining the Example of grease application which concerns on this 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.

  Hereinafter, embodiments 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 bearing 1 which is the workpiece W to which the grease is applied has a plurality of inner rings 2 and outer rings 3 and a plurality of rolling bearings 1 arranged in the circumferential direction at equal intervals in a space between the raceway surfaces 2b and 3b. 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 25 and a grease pump 26 for supplying the grease to the dispenser 20 so that a continuous discharge operation can be performed on a large amount 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.

  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 is substantially rectangular as shown in FIG. The direction of the cross section is such that two sides facing each other are orthogonal to the relative movement direction D of the needle 21 and the workpiece W viewed from above, and the other two sides are parallel. 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 the position where the workpiece W is applied, in the example shown in FIG. 6, the axial direction of the raceway 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 as shown in FIG. 6.

  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 that time, the substantially square 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 adhering to the cylindrical surface portion 3c in the XZ plane is a substantially square shape similar to the cross section of the needle 21 as shown in FIG.

  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 adhering to the cylindrical surface portion 3c becomes a substantially rectangular shape with a small thickness with respect to the direction of the rotation axis of the workpiece W. By arbitrarily setting the speed difference between V1 and V2, the volume and cross-sectional shape of the grease adhered to the cylindrical surface portion 3c can be controlled.

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

Claims (4)

  In a coating apparatus comprising 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 applied to a predetermined part of the workpiece. The high-viscosity fluid coating apparatus is characterized in that, in the section, the cross-sectional shape in a plane orthogonal to the longitudinal direction is a polygon.   The coating device according to claim 1, wherein a cross-sectional shape of the needle is substantially square.   A syringe filled with a high-viscosity fluid, and a hollow needle attached to one end of the syringe, the application device discharging the high-viscosity fluid through the needle, a work table on which the work is rotatably mounted, and A high-viscosity fluid application device including at least a control device for controlling, wherein the high-viscosity fluid is applied to a predetermined portion of the work by discharging the high-viscosity fluid from the needle while rotating the work. A characteristic coating apparatus.   The needle has a substantially square cross-sectional shape in a plane orthogonal to the longitudinal direction at the tip, and at least a pair of sides of the substantially square is arranged in a direction perpendicular to the direction of relative movement between the needle and the workpiece. The coating apparatus according to claim 3, wherein

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