JP4843410B2 - Oil seal - Google Patents

Description

  The present invention relates to an insert metal that forms a skeleton of an oil seal, and an oil seal including the insert metal.

  In fluid pressure equipment such as hydraulic equipment, oil seals are frequently used to prevent leakage of working fluid, and there are several types according to JIS B 2402. Of these, the insert metal that forms the skeleton of the oil seal is the seal. There are peripheral rubber types that are covered with rubber.

  5 (a), (b), and (c) are of the outer peripheral rubber type, and are diagrams illustrating oil seals as a background art of the present invention, and (d) to (f) are these oil seals. It is a figure which shows the manufacturing method of the insert metal used for.

  The oil seal 20 in FIG. 5 (a) is a spring-loaded outer peripheral rubber type, which is composed of a single lip 13 using the spring 12 and an insert metal 11, and whose outer peripheral surface is covered with rubber. It is.

  The oil seal 20A in FIG. 5 (b) is a springless outer peripheral rubber type, which is composed of a single lip 13A that does not use a spring and an insert metal 11, and whose outer peripheral surface is covered with rubber. is there.

  The oil seal 20B of FIG. 5C is a type with a spring-loaded outer peripheral rubber external dust intrusion prevention lip, and includes a single lip 13 and insert metal 11 using a spring 12, and external dust intrusion without using a spring. It consists of a lip 14 and the outer peripheral surface is covered with rubber.

  In these oil seals 20, 20A, 20B, the role of the insert metal 11 is to give rigidity to the entire mounting portion when mounting the oil seal 20, 20A, 20B, that is, when the outer peripheral portion is press-fitted into the mating housing, Appropriate tightening allowance is provided to generate appropriate sealing performance and frictional force to prevent deviation from a predetermined position.

  In any of these oil seals 20, 20A, 20B, the insert metal 11 is manufactured by a manufacturing method as shown in FIGS.

  That is, first, as shown in FIG. 5 (d), a flat plate PL as a material is prepared, and a disc 11S as a material is punched from now on. Next, as shown in FIG. 5E, a predetermined disk on the center side of the disk 11S is extracted to obtain a donut-shaped disk 11T.

  At this time, the hatched portion of the flat plate PL and the hatched portion of the disc 11T are portions that are not used for manufacturing the insert metal 11 and become a scrap and are in a poor material yield.

  Subsequently, the doughnut-shaped disk 11T is subjected to plastic working (for example, press molding) to complete an oil seal 11 that is a ring body 11L having an L-shaped cross section as shown in FIG.

  The insert metal 11 is formed of the same continuous material, has no joint portion by joining such as welding, and is excellent in strength.

  The oil seals 20, 20A, 20B described above are manufactured by using the insert metal 11 as a skeleton and covering the periphery by integral molding with rubber. The spring 12 is mounted after molding. The external dust intrusion prevention lip 14 is also formed by integral molding.

  However, in the insert metal 11 manufactured by the above-described manufacturing method, a considerable amount of scrap or scrap is generated. That is, there are few parts that are effectively utilized and much waste with respect to the original material weight, and improvements have been demanded from the viewpoint of cost and resource saving.

As for the oil seal, various prior arts including Patent Documents 1 and 2 have been proposed, but nothing related to the cost reduction from the material side of the above-described insert metal.
Japanese Patent Laid-Open No. 11-63072 JP 2005-233215 A

  An object of the present invention is to provide an insert metal capable of saving resources and reducing costs, and an oil seal using the insert metal.

The oil seal of the present invention is an oil seal in which an insert metal is covered with a rubber for sealing, and the insert metal forms a ring body having an L-shaped section from a rectangular flat plate material by plastic working. It is characterized in that the joints of the abutting states of the bodies are not joined.

Method for producing o Irushiru of the present invention is a manufacturing method of the oil seal covering the insert metal with a rubber seal,
The insert metal forms a ring body having an L-shaped cross section by plastic working from a rectangular plate-shaped material, and punches the appropriate place on the inner periphery of the ring body, so that the joints of the ring bodies touch each other. It is characterized by being in contact but not being joined .

The punching jig of the present invention is a punching jig used in the above-described method for manufacturing an oil seal , the receiving jig receiving the outer periphery and the side surface of the insert metal ring body to be formed, and the inner peripheral side of the ring body And a punch holder for punching at a proper position on the inner periphery of the ring body.

The oil seal and the manufacturing method thereof according to the present invention are further characterized in that the periphery of the molded insert metal is covered by integral molding with rubber so that the joint is not exposed to the outside .

According to the oil seal of the present invention, the insert metal of the oil seal, by plastic working from a rectangular flat plate-like material to form a L-shaped cross section of the ring body, joining the seam of the contact state with each other in the ring body As a result, there is no material part to be discarded in the manufacturing process, and no joining process is required, thus saving resources and reducing costs.

According to the method for manufacturing an oil seal of the present invention, a ring body having an L-shaped cross section is formed from a rectangular flat plate material by plastic working on a built-in insert metal, and punching is performed at a suitable position on the inner periphery of the ring body. As a result, the joints of the ring bodies are brought into contact with each other but are not joined, so that an insert metal that exhibits the above effects can be manufactured satisfactorily.

According to the punching jig of the present invention, it is a punching jig used in the above-described method for manufacturing an oil seal , the receiving jig receiving the outer periphery and the side surface of the formed insert metal ring body, Since a punch holder for punching is provided at a proper position on the inner periphery of the ring body from the peripheral side, a manufacturing method that exhibits the above effects can be easily realized.

According to the oil seal and the manufacturing method thereof of the present invention, the periphery of the insert metal after molding is covered by integral molding with rubber so that the seam is not exposed to the outside, so that the seam is not joined. The influence can be reduced.

  Hereinafter, embodiments (examples) of the present invention will be described with reference to the drawings.

  1A and 1B show a manufacturing method of an example of an insert metal according to the present invention, in which FIG. 1A is a diagram showing a state in which a rectangular flat plate of the material is cut out, and FIG. 1B is a diagram showing a cut out rectangular flat plate. (c) is a diagram of a state in which the rectangular flat plate is plastically processed into a cylindrical shape, and (d) is a diagram of a state in which the cylindrical shape is plastically processed into a ring body having an L-shaped cross section.

  The manufacturing method of the insert metal 1 of this invention is demonstrated using this figure. First, as shown in FIG. 1 (a), a flat plate having a width π · D and an appropriate length is prepared, and this is cut at a pitch of a dimension H in a direction orthogonal to the width π · D.

  Here, “π” is the circumferential ratio, “·” is multiplication, and “D” is the average inner and outer diameter of the circumferential portion 1c of the insert metal 1 after molding, “H”, as shown in FIG. "" Means the effective length (length before molding) obtained by adding the axial length H0 of the circumferential portion 1c of the insert metal 1 after molding and the radial length R0 of the side surface portion 1d. is there.

  In other words, the width π · D and the dimension H in this figure form the circumferential portion 1c and the side surface portion 1d of the insert metal 1 after molding.

  FIG. 1 (b) shows the rectangular flat plate (rectangular flat plate-like material) 1S after being cut. As a result, the symbol “H” is the width H, and the symbol “π · D” is the length π · D. To do.

  An annular body 1K shown in FIG. 1C is obtained by plastic processing the rectangular flat plate having the width H and the length π · D into an annular shape so that the width H becomes the width of the annular shape. At this time, the average diameter D of the torus 1K is the inside / outside average diameter D of the circumferential portion 1c of the insert metal 1 after completion of molding, as shown in FIG.

  In addition, since the toroid 1K is simply formed by plastic processing of the rectangular flat plate 1S into an annular shape, the contact portions of both end faces of the original rectangular flat plate 1S appear as a joint 1a '. The seam 1a 'is not joined by a method such as welding.

  Next, a ring body 1L shown in FIG. 1 (d) obtained by plastic processing so that the side surface portion 1d is further formed on the annular body 1K in this state is substantially completed as the insert metal 1. Yes.

  In addition, although it is confirmation, in FIG.1 (d), the code | symbol 1c is a circumference part of the ring body 1L, and the code | symbol 1d is a side part. Moreover, the code | symbol 1a is the joint of the state used as the ring body 1L, and is not joined also here.

  Further, in the manufacturing process so far, no unnecessary portions from the material are generated from the stage of the material shown in FIG. 1 (a) until it becomes the ring body 1L, and the effective use of the material does not occur. Has been.

  After this, a punching process is performed so that the joint 1a of the ring body 1L is properly in contact with the punching process. The punching process will be described below together with the description of the punching jig.

  FIG. 2 shows an example of a punching jig used in the method for producing an insert metal according to the present invention, in which (a) is a front view thereof and (b) is a longitudinal sectional view of (a). Accordingly, the same reference numerals are given to the parts that have already been described, and redundant description will be omitted.

  This punching jig 8 includes a receiving jig 6 that receives the outer periphery (outside of the circumferential portion 1c) and the side surface (outside of the side surface portion 1d) of the ring body 1L of the insert metal 1 to be formed, A punch holder 7 is provided for punching at a proper position on the inner circumference 1e (inside the circumferential portion 1c) of the ring body 1L from the circumferential side.

  The punch holder 7 includes a punch body 7b for punching on a cylindrical main body portion 7a that forms a gap that can move in a certain radial direction with respect to the inner peripheral surface 1f of the side surface portion 1d of the ring body 1L. It has become a protruding.

  When punching the inner periphery 1e of the ring body 1L with this punching jig 8, the outer periphery and the side surface of the ring body 1L are received by the receiving jig 6 as shown in FIG. The tip of the punch body 7b of the punch holder 7 on the side inner periphery 1f side is positioned at an appropriate position on the inner periphery 1e of the ring body 1L, and the punch holder 7 is moved in the direction of the thick arrow in FIG. The pressing force by 7b is applied to the inner periphery 1e of the ring body 1L.

  In this case, an example of an appropriate place for pressing the tip of the punch body 7b is the opposite side of the portion with the joint 1a of the ring body 1L, as shown in FIG.

  When the present inventor performs such punching, a compressive residual stress is generated on the inner diameter side of the punched circumferential portion 1c, and as a result, the inner diameter side of the circumferential portion 1c determines the place where the punching is performed. It was confirmed by experiments that it was found that it acts to make the seam 1a on the opposite side more abutting to bend as the center point.

  3A is a front view showing an example of an insert metal manufactured by the manufacturing method of FIGS. 1 and 2, FIG. 3B is a sectional view of FIG. 3A, and FIG. 3C is manufactured by the manufacturing method. The front view which shows the other example of insert metal, (d) is sectional drawing of (c).

  The insert metal 1 shown in FIGS. 3A and 3B has a punch portion 1b formed by punching at only one place on the opposite side of the joint 1a.

  In the insert metal 1A shown in FIGS. 3C and 3D, the punch part 1b formed by punching has a total of three places including one place opposite to the joint 1a and a pair of punch parts 1b perpendicular to the joint 1a. It is what has become.

  The reason for increasing the number of punch portions 1b in this way is to make the contact effect of the joint 1a more effective by punching, and the number is appropriately selected so that the contact effect of the joint 1a is exhibited. It may be one, two, three, or more.

  The insert metal 1 formed in this way forms a ring body 1L having an L-shaped cross section from a rectangular flat plate material by plastic working so that the joints of the ring bodies 1L that are in contact with each other are not joined. As a result, the waste part of the original material is not generated in the plastic working process, the material can be used effectively, and finally the seam is not joined. It can be omitted, saving resources and reducing costs.

  The insert metal 1, 1A of the present invention does not join the seam 1a. However, in the outer peripheral rubber type described in FIGS. 5A to 5C, the seam 1a is exposed to the outside. Without being bonded, the contact state is maintained by being covered with rubber, so that the influence of not joining the seam 1a is small, and it is sufficiently practical.

  FIG. 4 is a diagram illustrating an oil seal using the insert metal of the present invention. Three types (a), (b), and (c) are shown in FIGS. 5 (a), (b), and (c). ) Type.

  That is, the oil seal 10 in FIG. 4A is a spring-loaded outer peripheral rubber type, which is composed of a single lip 3 using the spring 2 and the insert metal 1 and whose outer peripheral surface is covered with rubber. belongs to.

  The oil seal 10A in FIG. 4 (b) is a springless outer peripheral rubber type, which is composed of a single lip 3A that does not use a spring and an insert metal 1, and whose outer peripheral surface is covered with rubber. is there.

  The oil seal 10B of FIG. 4C is a type with a spring-loaded outer peripheral rubber external dust intrusion prevention lip, which is a single lip 1 and insert metal 1 using a spring 2, and external dust invasion prevention without using a spring. It consists of a lip 4 and has an outer peripheral surface covered with rubber.

  The role of the insert metal 1 in these oil seals 10, 10A, 10B is the same as the insert metal 11 in the oil seals 20, 20A, 20B in FIGS. 5 (a), (b), (c), Here, since the insert metal 1 having the characteristics described in FIGS. 1 to 3 and having an effect is used, these oil seals 10, 10A, and 10B exhibit the effect of the insert metal 1 as an oil seal. .

  In addition, the insert metal and oil seal of this invention are not limited to said Example, A various modification and combination are possible in the range described in the claim and the range of Example.

  The insert metal and oil seal of the present invention can be used in an industrial field where a seal is required in a fluid pressure device using a working fluid, and resource saving and cost reduction are required.

The manufacturing method of an example of the insert metal of this invention is shown, (a) is a figure of the state which cuts out the rectangular flat plate of the raw material, (b) is a figure which shows the cut-out rectangular flat plate, (c) is the figure The figure of the state which carried out the plastic processing of the rectangular flat plate to the cylindrical shape, (d) is the figure of the state which plastically processed the cylindrical thing to the ring body of L-shaped section An example of the punching jig used in the manufacturing method of the insert metal of this invention is shown, (a) is the front view, (b) is a longitudinal cross-sectional view of (a). (A) is a front view which shows an example of the insert metal manufactured with the manufacturing method of FIG.1 and 2, (b) is sectional drawing of (a), (c) is the insert metal manufactured with the manufacturing method. Front view showing another example, (d) is a sectional view of (c) The figure which illustrates the oil seal using the insert metal of the present invention (A), (b), (c) is a figure which illustrates the oil seal used as background art, (d)-(f) is a figure which shows the manufacturing method of the insert metal used for these oil seals

Explanation of symbols

1, 1A Insert metal
1a seam
1b Punch part
1c circumference
1d side part
1e Inner circumference
1f Side circumference
1S rectangular flat plate (rectangular flat plate material)
1L ring body
6 Receiving jig
7 Punch holder
8 Punching jig 10, 10A, 10B Oil seal

Claims (4)

An oil seal in which the insert metal is covered with rubber for sealing,
The insert metal is formed by forming a ring body having an L-shaped cross section from a rectangular flat plate material by plastic working so as not to join the seams in a contact state between the ring bodies . An oil seal characterized in that the periphery is covered by integral molding with rubber so that the seam is not exposed to the outside . An oil seal manufacturing method in which an insert metal is covered with a rubber for sealing ,
The insert metal forms a ring body having an L-shaped cross section by plastic working from a rectangular plate-shaped material, and punches the appropriate place on the inner periphery of the ring body, so that the joints of the ring bodies touch each other. It was made to contact but not joined,
A method for producing an oil seal , characterized in that the insert metal is covered with an integral molding of rubber so that the joint is not exposed to the outside . 3. The method for producing an oil seal according to claim 2, wherein the punching is performed at a position facing the joint of the ring body. A punching jig used in the method of manufacturing an oil seal according to claim 2 or 3 ,
A receiving jig for receiving the outer periphery and the side surface of the ring body of the insert metal to be formed, and a punch holder for punching from the inner peripheral side of the ring body to an appropriate position on the inner periphery of the ring body. Punching jig characterized by

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