JP5350664B2 - Liquid material coating method and apparatus - Google Patents

Description

  The present invention relates to a liquid material coating method and apparatus, and more particularly to a liquid material coating method and apparatus suitable for coating a liquid material in a non-contact state on an annular inner peripheral surface.

  As an article provided with an annular inner peripheral surface, for example, an oil seal used for preventing leakage of a sealing fluid such as oil in a rotating part or a reciprocating part in an automobile, a motorcycle, various machines, or the like. Can be mentioned.

  FIG. 7 shows such a conventional oil seal. The oil seal 1 has a metal reinforcing ring 2 having an L-shaped cross section. The elastic ring 3 includes an elastic body 3 made of rubber so as to cover the lower side of the reinforcing ring 2. Are fixed together. The elastic body 3 is formed with an outer peripheral surface 4 positioned on the outer peripheral side of the reinforcing ring 2, and a seal lip 5 extending upward is formed inside the elastic body 3 from the reinforcing ring 2. A lip tip 6 that protrudes inward is formed on the inner peripheral surface of the seal lip 5. A mounting groove 7 is formed in the circumferential direction at a position corresponding to the lip tip 6 of the outer peripheral surface 4 of the seal lip 5, and an annular spring 8 is mounted in the mounting groove 7. ing.

  Such a conventional oil seal 1 is disposed between a predetermined cylindrical housing 9 and a shaft 10 which is held by a bearing or the like and rotates or reciprocates (hereinafter referred to as rotation) with respect to the housing 9. The outer peripheral surface 4 of the elastic body 3 is attached to one housing 9 side, and the lip tip 6 of the seal lip 5 is attached to the other shaft 10 side. Further, a spring 8 is mounted in the mounting groove 7 of the seal lip 5 to tighten the lip tip 6 inward in the radial direction. Then, the shaft 10 is rotated by interposing a lubricant such as oil or grease between the lip tip 6 of the seal lip 5 and the shaft 10, thereby sealing the sealing fluid. Yes.

  In order to apply the lubricant to the annular inner peripheral surface of the seal lip 5 of the oil seal 1, the present applicant applies a predetermined amount of lubricant in a non-contact state to a required portion of the inner peripheral surface of the seal lip 5. The sealing fluid can be properly sealed by the oil seal 1, and the lubricant is wasted by applying the lubricant only to the necessary portion of the inner peripheral surface of the seal lip 5. There has been proposed a method and apparatus for applying a lubricant that can significantly reduce the amount of lubricant consumed (see Patent Document 1).

Japanese Patent No. 2511235

  In the method and apparatus for applying a lubricant disclosed in Patent Document 1, the lubricant supplied on the application disk is rotated by rotating the application disk disposed inside the seal lip 5 at a high speed. It is scattered from the outer peripheral edge of the coating disk by centrifugal force and applied to the annular inner peripheral surface of the seal lip 5, and a predetermined amount of lubrication is made in a non-contact state on a required portion of the inner peripheral surface of the seal lip 5. The agent is applied.

  By the way, in recent years, in such an oil seal, in order to secure more stable lubricity, there is a tendency to expand the application area of the lubricant. In this case, in the lubricant application method and apparatus disclosed in Patent Document 1, the axial length of the application region where the lubricant is applied to the annular inner peripheral surface of the seal lip 5 is reduced. Therefore, in order to cope with the expansion of the lubricant application area, it is necessary to perform the coating operation twice.

  The present invention has been made in view of these points, and includes a liquid material containing a paint, a dye, and the like as well as a lubricant as a coating medium, and includes a decorative cylinder and the like as well as a seal lip of an oil seal. The annular inner peripheral surface of the annular product is to be applied, and the axial length of the coating area is increased with respect to the inner peripheral surface, so that the inner peripheral surface is not damaged, and a small amount of liquid is used. It is an object of the present invention to provide a method and an apparatus for applying a liquid material that can properly apply a liquid material to a wide area of the inner peripheral surface with an object, and that does not require a second application.

In order to achieve the above object, the liquid material application method according to the first aspect of the present invention is a liquid material for applying a predetermined amount of liquid material to an application region having a long axial length on the annular inner peripheral surface. In a method for applying an object, a predetermined amount of liquid material is held on an application disk having a diameter smaller than the inner diameter of the inner peripheral surface, the application disk is driven to rotate at high speed, and the liquid material is moved to the application circle. A scattering edge having an axial length corresponding to the axial length of the coating region formed on the outer peripheral end of the liquid material guiding surface of the plate, and in the direction opposite to the rotation direction of the coating disk A predetermined amount of liquid material is applied in a non-contact manner to the application region of the inner peripheral surface by scattering outside the scattering edge formed to increase the height .

  According to a second aspect of the present invention, there is provided a method for applying a liquid material, wherein the annular inner peripheral surface is an inner peripheral surface of a seal lip of an oil seal, and the liquid material is a lubricant. Features.

According to a third aspect of the present invention, there is provided a liquid material application apparatus for applying a predetermined amount of a liquid material in a non-contact manner to an application region having a long axial length on an annular inner peripheral surface. In the apparatus, a coating disk having a diameter smaller than the inner diameter of the inner peripheral surface is disposed inside the inner peripheral surface so as to be freely rotatable at high speed, and a filling portion is formed to hold the liquid substance on the coating disk. In addition, it is a scattering edge that scatters the liquid material drawn out from the filling portion by centrifugal force at an axial length corresponding to the axial length of the application region, and the rotation direction of the application disk A liquid material guiding surface having scattering edges formed so as to increase its height in the opposite direction was formed, and a liquid material supply device for supplying a predetermined amount of liquid material to the filling portion was disposed. It is characterized by.

According to a fourth aspect of the present invention, there is provided the apparatus for applying a liquid material, wherein the annular inner peripheral surface is an inner peripheral surface of a seal lip of an oil seal, and the liquid material is a lubricant. Features.

When the apparatus for applying a liquid material of the present invention according to claim 3 is operated by the method for applying a liquid material of the present invention according to claim 1, the coating disk rotates at a high speed, and a filling portion of the coating disk is obtained. The liquid material held on the outer surface is guided to the outer liquid material guiding surface by centrifugal force, and subsequently is a scattering edge having an axial length corresponding to the axial length of the application region . It is scattered toward the inner peripheral surface from the scattering edge that is formed so as to increase its height in the direction opposite to the rotation direction of the disk, and reliably to the coating region having a long axial length. A liquid material can be satisfactorily applied.

Further, when the apparatus for applying a liquid material of the present invention described in claim 4 is operated by the method for applying a liquid material of the present invention described in claim 2, the axial length of the inner peripheral surface of the seal lip of the oil seal is increased. It is possible to apply the lubricant as a liquid material in a non-contact state to a long coating area, and there is no risk of damaging the lip tip of the sharply formed seal lip, and it is properly placed in the necessary place. By applying a certain amount of lubricant, the sealing fluid can be properly sealed with an oil seal. Further, since the lubricant can be applied only to a necessary portion of the inner surface of the seal lip, there is no waste of the lubricant and the consumption of the lubricant can be significantly reduced.

  As described above, the method and apparatus for applying a liquid material according to the present invention is not limited to a lubricant, but a liquid material containing paint, dye, etc. is used as an application medium, and is not limited to an oil seal seal lip, but a decorative cylinder. The annular inner peripheral surface of the annular product including the application target, the axial length of the application region is increased with respect to the inner peripheral surface, and the inner peripheral surface is not damaged, With a small amount of liquid material, the liquid material can be appropriately applied to a wide area on the inner peripheral surface, and the effect of being able to cope with the expansion of the application area by eliminating the need for a second application and the like.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

  FIG. 1 shows an embodiment of a liquid material coating apparatus according to the present invention.

  The liquid material applicator 11 of the present embodiment is formed as an example of an oil seal 1 as an annular product to be applied, and with respect to the annular inner peripheral surface formed of the lip tip 6 of the seal lip 5, A predetermined amount of lubricant (not shown) is applied to the coating area A having a long axial length (in this embodiment, almost the entire inner peripheral surface of the seal lip 5 in the oil seal 1 shown in FIG. 7). It is formed so as to be applied in a non-contact manner.

The coating device 11 has a diameter smaller than the inner diameter of the seal lip 5 of an oil seal 1 formed by integrally fixing an elastic body 3 in which a seal lip 5 having a lip tip 6 is formed on a reinforcing ring 2. A working disk 12 is disposed horizontally. As shown in FIGS. 2 to 4, the coating disk 12 is formed with an annular filling groove 13 for holding a liquid material on the center side of the upper surface, and the outer peripheral side of the filling groove 13. The liquid material guiding surface is provided with a scattering edge 15 for scattering the liquid material fed out from the inside of the filling groove 13 by centrifugal force at an axial length corresponding to the axial length of the application region A. 14 is formed. In the present embodiment, the liquid material guiding surfaces 14 are formed at positions that divide the upper surface of the coating disk 12 into six equal parts. Each liquid material guiding surface 14 is formed so as to increase the height of the scattering edge 15 in the direction opposite to the rotation direction of the coating disk 12 (see the arrow direction in FIGS. 2 and 3). In the present embodiment, the liquid material guiding surface 14 is formed as a gently sloping inclined surface 14a having a small inclination angle θ1. Further, a steeply inclined surface 14b having a large inclination angle θ2 is connected between the top of the gently inclined inclined surface 14a and the lowest part of the adjacent gently inclined inclined surface 14a.

  In addition, a rotating shaft 16 extending upward is attached to the center of the coating disc 12, and the rotating shaft 16 is composed of, for example, an air motor and has a speed of 20000 to 30000 r. p. m. A motor 17 that can be driven to rotate at a high speed is connected.

In addition, a liquid material supply device 18 for supplying a liquid material to the filling groove 13 of the application disk 12 is disposed above the application disk 12. The liquid material supply device 18 is made of grease. And a storage tank 19 for storing a predetermined liquid material (oil seal lubricant). The liquid supply device 18 is provided with a discharge nozzle 20 for dropping the liquid material into the filling groove 13. The base of the discharge nozzle 20 is formed of, for example, an electromagnetic valve or the like in the storage tank 19. A discharge controller 21 that is opened and closed to send a fixed amount of liquid material to the discharge nozzle 20 is provided. Further, the liquid supply device 18 is provided with a pump 22 for discharging the liquid in the storage tank 19 from the discharge nozzle 20. Instead of the pump 22, the liquid material may be discharged from the discharge nozzle 20 by guiding the driving fluid with an air source (not shown) or the like.

  Further, an elevating device 23 that moves the oil seal 1 up and down is disposed below the application disk 12. The elevating device 23 includes a holding arm 25 that is moved up and down by a lifting cylinder 24. Yes. A holding body 26 that holds the lower surface and the outer peripheral surface portion of the oil seal 1 is fixed to the distal end portion of the holding arm 25.

  Further, the liquid material coating apparatus 11 is provided with a control circuit 27, and the control circuit 27 drives and controls the motor 17, the discharge controller 21 of the liquid material supply device 18, the pump 22, and the elevating cylinder 24. Have been to.

  Next, a liquid coating method using the coating apparatus 11 of this embodiment will be described.

  In the present embodiment, the storage tank 19 is filled with a desired liquid substance (lubricant for oil seal), the desired oil seal 1 is held by the holding body 26 of the lifting device 23, and the lifting cylinder 24 is operated. By raising the holding arm 25, the inner peripheral surface of the lip tip 6 of the seal lip 5 of the oil seal 1 is positioned on the outer peripheral side of the coating disk 12.

  In this state, the control circuit 27 operates the pump 22 and also operates the discharge controller 21 to discharge a predetermined amount of liquid material from the discharge nozzle 20 to the filling groove 13 of the coating disk 12. Thereafter, by operating the motor 17, the coating disk 12 is instantaneously rotated at high speed. Due to the high-speed rotation of the coating disc 12, the liquid material held in the filling groove 13 is fed out onto the gentle inclined surface 14a of the outer liquid material guiding surface 14 by the centrifugal force, and then the gentle A seal lip is formed from the scattering edge 15 which is guided outwardly over the inclined surface 14a of the gradient and finally has an axial length corresponding to the axial length of the application region A (see FIG. 7). 5 is scattered toward the inner peripheral surface of the lip tip 6 and uniformly applied to the application region A. At this time, since the inclined surface 14a of the liquid material guiding surface 14 is formed so as to increase the height of the scattering edge 15 in the direction opposite to the rotation direction of the coating disk 12, the length in the axial direction is surely increased. The liquid material can be uniformly and uniformly applied to the long application region A.

  Further, when the present embodiment is specialized for applying the lubricant to the oil seal, the liquid is applied in a non-contact state to the application region A in which the axial length of the inner peripheral surface of the seal lip 5 of the oil seal 1 is long. The lubricant as an object can be applied, and there is no risk of damaging the lip tip 6 of the seal lip 5 formed sharply. Sealing of the sealing fluid by the seal 1 can be performed appropriately. Further, since the lubricant can be applied only to a necessary portion of the inner peripheral surface of the seal lip 5, there is no waste of the lubricant and the consumption of the lubricant can be remarkably reduced.

  As shown in FIG. 5 and FIG. 6, the application disc 12 applies the liquid material uniformly and uniformly to the application region A having a long axial length in both the forward and reverse rotation directions. You may form so that it can do. Specifically, as shown in FIGS. 5 and 6, a position where a tapered surface 28 whose height increases radially outward from the center-side filling groove 13 and further divides the circumferential direction into six equal parts is formed. Each of the liquid material guiding surfaces 14 is formed by forming a liquid material guiding surface 14 formed of a concave portion that forms a part of a symmetrical ridge in the forward / reverse rotation direction so that the depth increases toward the radially outer side. The intersection with the outer peripheral surface of the working disk 12 is a scattering edge 15. By making the height difference between the lowest position and the highest position of the scattering edge 15 the same as the height of the application area A, the length in the axial direction in any of the forward and reverse rotation directions of the application disk 12 is achieved. The liquid material can be uniformly and uniformly applied to the coating area A having a long length.

  In the embodiment, the case where the lubricant is applied to the oil seal has been described. However, the liquid material as the application medium includes not only the lubricant but also a paint, a dye, and the like. Not only the seal lip of the oil seal but also an annular inner peripheral surface of an annular product including a decorative cylinder and the like.

  The present invention is not limited to the above-described embodiments, and various modifications can be made as necessary.

The schematic block diagram which shows one Example of the coating device of the liquid substance which concerns on this invention The perspective view which shows the application disc of FIG. FIG. 2 is a plan view showing the coating disk of FIG. Front view showing the application disk of FIG. The top view which shows the other disc for application of the present invention Front view showing the coating disk of FIG. Longitudinal sectional view showing a conventional general oil seal

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Oil seal 2 Reinforcement ring 5 Seal lip 11 Liquid material applicator 12 Coating disc 13 Filling groove 14 Liquid material guide surface 15 Splashing edge 17 Motor 18 Liquid material supply device

Claims (4)

In the liquid material application method for applying a predetermined amount of liquid material to the application region having a long axial length of the annular inner peripheral surface,
A coating material disk having a diameter smaller than the inner diameter of the inner peripheral surface holds a predetermined amount of liquid material, the coating disk is rotated at high speed, and the liquid material is guided to a liquid material guide surface of the coating disk. A scattering edge having an axial length corresponding to the axial length of the coating region formed at the outer peripheral edge of the coating disk so as to increase its height in the direction opposite to the rotation direction of the coating disk. A liquid material coating method, wherein a predetermined amount of liquid material is applied in a non-contact manner to the application region of the inner peripheral surface by being scattered outside the scattering edge formed on the inner surface.   2. The method for applying a liquid material according to claim 1, wherein the annular inner peripheral surface is an inner peripheral surface of a seal lip of an oil seal, and the liquid material is a lubricant. In a liquid material application apparatus for non-contact application of a predetermined amount of liquid material to an application region having a long axial length of an annular inner peripheral surface, a coating disk having a diameter smaller than the inner diameter of the inner peripheral surface Is disposed inside the inner peripheral surface so as to be freely rotatable at high speed, and a filling portion for holding the liquid material on the coating disc is formed, and the liquid material fed out by centrifugal force from the filling portion is A scattering edge that is scattered at an axial length corresponding to the axial length of the application region, and is formed to increase its height in the direction opposite to the rotation direction of the application disk. A liquid material applicator characterized in that a liquid material supply surface is provided, and a liquid material supply device for supplying a predetermined amount of liquid material to the filling portion is disposed.   4. The liquid material applicator according to claim 3, wherein the annular inner peripheral surface is an inner peripheral surface of a seal lip of an oil seal.

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