JP2007024205A - Oil seal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To connect a core metal and a seal part without using an adhesive in an oil seal comprising the core metal having an axial part and a radial part extending from the axial part, and the seal part, and to easily mount the oil seal without causing a fixed sealing part of the seal part to be turned up from the core metal even if contacting a valve guide when fitted to the valve guide. <P>SOLUTION: In this oil seal, through holes 13, 14, 15 formed in the axial part 11 and radial part 12 of the core metal 10 are loaded with the fixed sealing part 26 of the seal part 20 to connect the core metal 10 and the seal part 20. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an oil seal, and more particularly to a reciprocating valve stem seal used for a valve stem of an intake / exhaust valve of an internal combustion engine.

  Conventionally, a valve stem seal used for a valve stem of an intake / exhaust valve of an internal combustion engine has a valve stem on which an intake / exhaust valve is mounted on the anti-sealing fluid side, and a valve stem seal that surrounds the periphery of the valve stem seal. It is for sealing the annular space between the valve guide installed in the hole penetrating to the sealing fluid side. It is installed on the valve guide and lubricated by the seal lip sliding on the peripheral surface of the valve stem. An appropriate amount of lubricating oil is supplied to seal the lubricating oil in the oil chamber and to form an oil film in the annular space.

  The valve stem seal 101 includes a cored bar 102 and a seal portion 103 as shown in FIG. The cored bar 102 includes an axial portion 104 fitted in the housing, and a radial portion 105 extending from the end of the axial portion 104 on the sealed fluid side A toward the inner diameter direction. The seal portion 103 includes a fixed sealing portion 106 that is adhesively bonded to the core metal 102 via an adhesive (not shown), and a seal body that has a seal lip 107 that is integrally formed with the fixed sealing portion 106 and that slidably contacts a shaft stem that is a shaft. Part 108. In order to adhesively bond the seal portion 103 to the core metal 102, an adhesive is applied to the core metal 102 and then inserted into the mold, and then a rubber-like elastic body serving as the seal portion 103 is filled into the mold and vulcanized. It is done by doing.

  However, since the cored bar 102 and the seal portion 103 are adhesively bonded via an adhesive, a process of applying the adhesive to the cored bar 102 is required, which increases the process and deteriorates productivity. Since an adhesive is used, there is a disadvantage that the manufacturing cost increases.

  The following patent document also discloses a valve stem seal in which a core metal and a seal portion are bonded without using an adhesive, but the diameter of the core metal covered with the seal portion of a rubber-like elastic body is disclosed. Since only a small hole is provided in the direction part and the cored bar and the seal part are joined, as shown in FIG. 4, when inserting the anti-seal fluid side B of the valve stem seal 101 in the direction of the arrow X, There is a drawback in that the oil seal 101 cannot be attached because the shaft side fixed sealing portion 109 that is in close contact with the inner diameter side of the axial direction portion 104 of the core metal 102 comes into contact with the valve guide 111 located on the inner diameter side.

Japanese Utility Model Publication No. 02-038568

  In view of the above, the present invention provides an oil seal provided with a cored bar and a seal part used for a valve stem of an intake / exhaust valve of an internal combustion engine, without using an adhesive for the cored bar and the seal part. An object of the present invention is to provide an oil seal that can be easily mounted without being pulled from a metal core even when the fixed sealing portion of the seal portion comes into contact with the valve guide when coupled and fitted to the valve guide. .

  To achieve the above object, an oil seal according to claim 1 of the present invention is mounted to seal an annular space between two members assembled so as to be relatively movable with respect to each other. In an oil seal comprising a core bar provided with an axial part fitted to the inner peripheral surface of the member and a radial part extending therefrom, and a seal part slidably contacting another member, the axial part and the radial direction of the core metal The cored bar and the seal part are connected to each other by loading a fixed sealing part of the seal part into a through hole formed in the part.

  The present invention has the following effects.

  That is, in the oil seal of the present invention having the above-described configuration, the seal portion is fixed by loading the fixed sealing portion of the seal portion into the through holes formed in the axial portion and the radial portion of the cored bar. Since it is bonded to the core and no adhesive is used, the manufacturing cost can be reduced, and the step of applying the adhesive during the production of the oil seal can be omitted, and the productivity can be improved.

  In addition, since the fixed sealing part of the seal part is loaded in the through hole provided in the cored bar, the sealing part is coupled to the cored bar, so the fixed sealing part has a wedge-like fitting force and is bonded The seal portion can be bonded to the cored bar with the same binding force as when an agent is used.

  Furthermore, since the through hole is provided not only in the radial direction part of the cored bar but also in the axial direction part and the seal part is joined, when the oil seal is fitted to the valve guide, the valve guide located on the inner diameter side is connected to the core. Even if the fixed sealing portion of the seal portion coupled to the inner diameter side of the gold axial direction portion comes into contact, the fixed sealing portion does not come off from the core metal, and the oil seal can be easily attached.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, exemplary embodiments of the invention will be described with reference to the drawings.

  FIG. 1 is a cross-sectional view of a main part of a balm stem seal which is a kind of oil seal to which the present invention is applied. The balm stem seal 1 includes a cored bar 10, a seal part 20, and a garter spring 30. Yes.

  The valve stem seal 1 is attached to a valve stem in which a valve for intake and exhaust of an internal combustion engine is attached to the anti-sealing fluid side, and a hole penetrating from the sealing fluid side to the anti-sealing fluid side so as to surround its periphery. It is mounted to seal the annular space between the valve guides.

  The metal core 10 is formed of a metal sheet metal, and has an axial portion 11 fitted to a valve guide (not shown) as a housing, and an inner diameter from the end A of the sealed fluid side of the axial portion 11. The axial direction portion 11 is formed with an anti-sealing fluid side through hole 13 and a sealing fluid side through hole 14, and the radial direction portion 12 is also formed with a radial direction through hole 15. Has been. A plurality of through holes (13, 14, 15) are formed evenly on the circumference.

  The seal portion 20 includes a seal body portion 21 and a fixed sealing portion 26 that are integrally formed of a rubber-like elastic body. The seal body 21 is in sliding contact with a valve stem (not shown) which is a shaft on the inner diameter side, and is located on the sealing fluid side A, and the sub seal lip located on the anti-sealing fluid side B from the main seal lip 22. 23, a recess 24 is formed on the outer diameter side of the lip edge of the main seal lip 22, and a garter spring 30 that presses the seal main body 21 in the radial direction is attached to the recess 24.

  The fixed sealing portion 26 is formed by integrally forming a shaft-side fixed sealing portion 27 covering the axial portion 11 of the core metal 10 and a seal fixing sealing portion 28 covering the radial portion 12. It is. The shaft-side fixed sealing portion 27 includes an inner diameter fixed sealing portion 27 a located on the inner diameter side of the axial direction portion 11 of the core metal 10 and an outer diameter fixed sealing portion 27 b located on the outer diameter side. The anti-sealing fluid side through-fixing sealing portion 27c loaded in the anti-sealing fluid side through hole 13 formed in the portion 11 and the sealing fluid side through fixing sealing portion 27d loaded in the sealing fluid side through hole 14 It is connected. That is, the anti-sealing fluid side through fixed sealing portion 27c and the sealing fluid side through fixed sealing portion 27d exert a wedge effect to connect the axial side fixed sealing portion 27 to the axial direction portion 11 of the core metal 10 in the axial direction. An outer diameter fixed sealing portion 27b is provided on the outer diameter side of the portion 11 in a thin shape.

  The seal fixing sealing portion 28 includes a sealing fluid fixing sealing portion 28a positioned on the sealing fluid side A of the radial portion 12 of the core metal 10 and an anti-sealing fluid fixing sealing portion 28b positioned on the anti-sealing fluid side B. They are connected by a radial portion through fixed sealing portion 28 c that is loaded in a radial portion through hole 15 formed in the radial portion 12 of the cored bar 10. That is, the seal fixing sealing portion 28 is coupled to the radial direction portion 12 of the core metal 10 by the wedge effect by the radial direction through fixing sealing portion 28c.

  Therefore, in the above configuration, the shaft-side fixed sealing portion 27 is fitted to the axial portion 11 of the core metal 10 by a wedge-like fitting force by the anti-sealing fluid side through-fixing sealing portion 27c and the sealing fluid side through-fixing sealing portion 27d. Since the seal fixing sealing portion 28 is connected to the radial direction portion 12 of the core metal 10 with a wedge-like fitting force by the radial direction penetration fixing sealing portion 28c, the same degree as that without using an adhesive. The seal portion 20 can be coupled to the cored bar 10 with a coupling force.

  In addition, since the seal portion 20 is coupled to the metal core 10 with a wedge-like fitting force, it becomes possible to eliminate the need for an adhesive, and since no adhesive is used, an adhesive is applied to the metal core 10. It becomes possible to dispense with a process for applying.

  Further, since the shaft-side fixed sealing portion 27 is coupled to the axial direction portion 11 of the core metal 10 by the wedge effect, when the valve stem seal 1 is fitted, the shaft-side fixed sealing portion 27 of the seal portion 20 is Even if it contacts the valve guide located on the inner diameter side, it is possible to prevent the core bar 10 from being bent from the axial direction portion 11.

  In this case, the axial position of the anti-sealing fluid side through-hole 13 formed in the axial direction portion 11 is sealed with the seal assembly portion on the inner diameter side of the axial side fixed sealing portion 27 as shown in FIG. It is good to form in the anti-sealing fluid side B from the convex part 29a located in the most anti-sealing fluid side B among the convex parts (29a, 29b) formed in order to ensure property.

  Since the anti-sealing fluid side B is inserted at the head when the valve stem seal 1 is fitted, the axial position of the anti-sealing fluid side through-hole 13 is determined from the convex portion 29a formed in the shaft side fixed sealing portion 27. By adopting the anti-sealing fluid side B, the portion where the shaft side fixed sealing portion 27 is coupled to the axial direction portion 11 by the wedge effect comes into contact with the valve guide before the convex portion 29a. It is possible to prevent the portion 27 from being twisted from the axial direction portion 11 of the cored bar 10.

  In the present embodiment, two through holes (13, 14) formed in the axial portion 11 of the cored bar 10 have been described. However, the number is not limited to two, and three or more through holes may be used. It may be one or one.

Sectional drawing of the principal part of the valve stem seal which concerns on this invention Sectional drawing of the principal part of the valve stem seal which concerns on another embodiment of this invention. Sectional view of the main part of a valve stem seal according to a conventional example Explanatory drawing about malfunction of valve stem seal according to conventional example

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Valve stem seal 10 Core metal 11 Axial direction part 12 Radial direction part 13, 14, 15 Through-hole 20 Seal part 21 Seal main body part 22, 23 Seal lip 24 Recessed part 26, 27, 28 Fixed sealing part 29 Convex part 30 Spring A Sealed fluid side B Anti-seal fluid side

Claims (1)

It is mounted to seal an annular space between two members assembled so as to be movable relative to each other,
In an oil seal comprising a mandrel comprising an axial part fitted to the inner peripheral surface of one member and a radial part extending therefrom, and a seal part slidably contacting the other member,
The cored bar and the seal part are combined by loading a fixed sealing part of a seal part into a through hole formed in the axial part and the radial part of the cored bar. Oil seal.

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