JP2006002894A - Seal washer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seal washer to be laid between a screw member and a partner member in a non-eccentric manner without forming a counter sinking in the partner member even when used for the partner member having a screw hole being the same in diameter and an opening portion different in inner diameter. <P>SOLUTION: A seal lip 20 is formed integrally with a guide part 30 having a contact face 32 whose axial section thickness G1 is not smaller than a thread interval G2 of the screw member 2 and not greater than the section thickness of a washer body 10. It is joined to the inner periphery of the washer body 10. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a washer having a sealing function used for seating parts of parts for automobiles, agriculture, construction machines and the like.

  The washer interposed between the screw member such as a bolt and the seating surface of the mating member coupled thereto is made of a metal ring so that the internal fluid does not leak through the screw hole formed in the mating member. The following Patent Document 1 discloses that the washer body is covered and sealed with an elastic body such as rubber.

  However, in the seal washer described in Patent Document 1, since the rubber covers the entire surface of the metal washer body, the rubber member sandwiched between the screw member and the seating surface of the mating member is subjected to compressive stress. As a result, there has been a problem that the fastening torque of the bolt is reduced, and therefore, a seal washer in which a seal lip made of an elastic body such as rubber is integrally formed and vulcanized on the inner periphery of the washer body has been proposed. .

  However, even in the case of a seal washer used for a mating member in which screw holes of the same diameter are formed, the shape of the opening varies depending on the specification. In the case of the shape shown in FIG. Since the seal washer 106 is not mounted eccentrically because it is placed on the seating surface 103, the opening 105 of the mating member 102 is large as shown in FIG. 4, and the seal lip 101 is the seating surface 103 of the mating member 102. When the washer main body 104 is detached and placed on the seating surface 103, the seal washer 106 is mounted in an eccentric state when the screw member is screwed, and the sealing effect cannot be sufficiently obtained. In order to prevent eccentricity, there is a specification corresponding to the guide lip provided on the inner periphery of the seal lip so as to be in contact with the screw member, but the axial cross-sectional thickness of the contact surface of the guide portion is equal to or less than the thread interval. Therefore, the contact surface of the guide portion falls into the valley of the screw, and the eccentricity cannot be corrected. For this purpose, a counterbore is provided on the mating seat surface and guided by the outer peripheral surface of the seal washer to prevent the eccentricity.

JP-A-11-294437

  In view of the above points, the present invention is a case where a screw hole having the same diameter and an opening having different inner diameters is used, and the screw member and the counterpart member are not provided with a counterbore. An object of the present invention is to provide a seal washer that can be interposed without being eccentric.

  To achieve the above object, a seal washer according to claim 1 of the present invention is a seal in which a seal lip made of a rubber-like elastic body is joined to the inner periphery of a washer body between a screw member and a mating member. The washer includes the seal lip in which a guide portion having a contact surface whose axial cross-sectional thickness is equal to or greater than a thread interval of the screw member is integrally formed.

  A seal washer according to claim 2 of the present invention is characterized in that, in claim 1, the axial cross-sectional thickness of the contact surface of the guide portion is equal to or less than the cross-sectional thickness of the washer body. .

  The present invention has the following effects.

  That is, the seal washer of the present invention having the above-described configuration has a seal lip integrally formed with a guide portion having a contact surface whose axial cross-sectional thickness is equal to or greater than the thread interval of the screw member. When interposed between the screw member and the mating member, even if the inner diameter of the opening of the mating member is larger than the outer diameter of the seal lip and the seal lip comes off the seating surface of the mating member, the screw member is screwed onto the mating member. Since the contact surface of the seal lip guide part simultaneously contacts the thread of the screw member and the adjacent thread, and the contact surface does not fall into the valley, the screw member and the mating member are not eccentric. It can be interposed between the members. Therefore, since the seal washer is not eccentric and is interposed between the seating surfaces of the screw member and the mating member, the seal lip can seal the leakage of the internal fluid through the screw hole formed in the mating member.

  In addition, since the axial cross-sectional thickness of the contact surface of the guide portion is equal to or less than the cross-sectional thickness of the washer body, the washer body can be tightened even when a seal washer is interposed between the screw member and the mating member. Thus, since the gap between the screw member and the mating member is secured, it is possible to prevent the contact surface of the guide portion from being deformed due to the compressive stress.

  Preferred embodiments of the present invention will be described below with reference to the drawings. However, the scope of the present invention is not intended to be limited to the contents described in this embodiment unless otherwise specified.

  FIG. 1 shows a cross section of a main part of a seal washer 1 according to an embodiment of the present invention, and FIG. 2 shows a state in which the seal washer 1 of FIG. 1 is interposed between a screw member 2 and a mating member 3. ing.

  A seal washer 1 shown in FIG. 1 includes a flat annular washer body 10 and a seal lip 20 that is vulcanized and bonded to the inner periphery of the washer body 10.

  The washer body 10 is formed of a metal plate such as SPCC or SUS or a hard synthetic resin such as polyphenylene sulfide (PPS) or phenol resin, and is an inner peripheral shaft that is a joint with the seal lip 20. On both sides in the direction (vertical direction in the figure), annular recesses 11 are formed that continuously extend in the circumferential direction along the inner peripheral edge.

  The seal lip 20 is formed of a rubber-like elastic material selected from, for example, EPDM (ethylene propylene rubber), fluorine rubber, urethane rubber, silicone rubber, and the like. 30 is a structure integrally formed.

  The seal lip main body 21 has an outer peripheral portion 22 vulcanized and joined to the washer main body 10 at an end surface on the outer peripheral side where the axial cross-sectional thickness gradually increases toward the inner periphery and the axial cross-sectional thickness is minimum. The guide portion 30 is joined to the end surface on the inner peripheral side by integral molding vulcanization, the axial cross-sectional thickness is equal to or larger than the cross-sectional thickness of the washer main body 10, and protrudes from the washer main body 10 in the axial direction so And an inner peripheral portion 24 having lip portions 23a and 23b for preventing the leakage of the internal fluid by being compressed when screwed into the mating member 3. The outer peripheral portion 22 joined to the washer body 10 is filled with a part of the rubber-like elastic material in the annular recess 11 of the washer body 10 during vulcanization joining, and the surface of the filled rubber layer is the surface of the washer body 10. Forms substantially the same plane as both axial end faces.

  The guide portion 30 is connected to the inner peripheral portion 24 of the seal lip main body portion 21 by integral molding on the outer peripheral side, and a contact surface 32 that contacts the thread 4 of the screw member 2 is formed on the inner peripheral end surface 31. Yes. As shown in FIG. 2, the inner diameter D <b> 1 of the contact surface 32 is the thread 4 of the screw member 2 so that the contact surface 32 contacts the thread 4 of the screw member 2 when the screw member 2 is screwed to the counterpart member 3. The outer diameter D2 is equal to or slightly smaller than the outer diameter D2. Further, the axial cross-sectional thickness G1 of the contact surface 32 is a value equal to or greater than the thread interval G2 so as to be able to simultaneously contact the thread 4b adjacent to the thread 4a of the screw member 2, and the seal It is formed to a value equal to or smaller than the axial cross-sectional thickness G3 of the main body.

  Accordingly, as shown in FIG. 2, when the seal washer 1 having the above-described configuration is used to interpose between the screw member 2 and the mating member 3, the inner diameter of the opening 4 formed in the mating member 3 is the seal lip main body portion. If it is larger than the outer diameter of 21, the seal lip 20 is placed off the seating surface 5 of the mating member 3 and eccentric. However, even in this case, the screw thread 4 abuts against the contact surface 32 of the guide portion 30 when the screw member 2 is screwed, and the axial cross-sectional thickness G1 of the contact surface 32 is equal to or larger than the screw thread interval G2, so that 2 simultaneously. More than four screw threads 4 come into contact with the contact surface 32. Therefore, since the contact surface 32 is maintained parallel to the center line μ of the screw member 2 without being inclined, correction is made when the screw member 2 is screwed even if the seal washer 1 is initially placed in an eccentric state. Thus, the screw member 2 and the mating member 3 can be interposed without being eccentric.

  In addition, in a state where the screw member 2 is coupled to the mating member 3, the lip portions 23 a and 23 b of the seal lip main body 21 protrude from the outer peripheral end surface of the washer body 10, so that the coupling surface of the screw member 2 and the mating member 3 The axial cross-sectional thickness G1 of the contact surface 32 of the washer body 10 is the axial cross-sectional thickness G3 of the washer body 10, although it functions to prevent leakage of internal fluid by being compressed in the axial direction with the seating surface 5. Therefore, the contact surface 32 is not subjected to compressive stress due to the axial gap secured by the highly rigid washer body 10 between the screw member 2 and the counterpart member 3, and deformation can be prevented. It becomes possible.

Sectional view of a seal washer according to the present invention Sectional view with the seal washer of FIG. 1 installed Sectional drawing which mounted the seal washer which concerns on a prior art example on the other party member Sectional drawing which mounted the seal washer which concerns on another prior art example on the other party member

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Seal washer 2 Screw member 3 Opposing member 4a, 4b Thread 5 Seating surface 10 Washer main body 11 Annular recessed part 20 Seal lip 21 Seal lip main body 22 Outer peripheral part 23a, 23b Lip part 24 Inner peripheral part 30 Guide part 31 End surface 32 Contact Surface D1 Contact surface inner diameter D2 Thread outer diameter G1 Contact surface axial section thickness G2 Thread spacing

Claims (2)

In the seal washer interposed between the screw member and the mating member, the seal lip made of a rubber-like elastic body is joined to the inner periphery of the washer body.
A seal washer comprising the seal lip integrally formed with a guide portion having a contact surface whose axial cross-sectional thickness is equal to or greater than a thread interval of the screw member.   2. The seal washer according to claim 1, wherein an axial sectional thickness of a contact surface of the guide portion is equal to or less than a sectional thickness of the washer body.

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