JP2005226692A - Seal washer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seal washer 10 inseparable from a washer body 11 even when a seal lip 12 is subjected to compressive deformation. <P>SOLUTION: The seal washer 10 comprises the seal lip 12 of a rubber elastic material integrally formed on the inner periphery of the washer body 11. Recessed portions 111a, 111b are formed on both sides of an inner peripheral portion 111 of the washer body 11 in the axial direction. A plurality of through-holes 113 communicating the recessed portions 111a, 111b with each other are opened at preset spaces in the circumferential direction. Parts 121-123 of the rubber elastic material for the seal lip 12 are filled in the recessed portions 111a, 111b and the through-holes 113. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a washer having a sealing function, which is used in a seating part of a component such as a bolt, a rivet, and an electrode.

The washer interposed between the screw member such as a bolt and the seating surface of the mating member to be tightened thereby has a seal washer having a sealing function so that the internal fluid does not leak through the screw hole, The typical prior art is disclosed in Patent Document 1 below. In this seal washer, the entire surface of an annular washer body made of metal is covered with a rubber layer.
JP-A-11-294437

  However, the seal washer described in Patent Document 1 requires that the thickness of the rubber layer be increased to some extent when a highly reliable sealing property is required, and the bolt and the mating member increase as the thickness of the rubber layer increases. The compression between the seating surfaces tends to cause stress relaxation in the rubber layer, and the fastening torque of the bolt is reduced.

  Accordingly, as another prior art, as shown in the cross-sectional perspective view of FIG. 7, a seal lip 102 made of a rubber-like elastic material is integrally formed (vulcanized and bonded) on the inner periphery of a metal washer body 101. A seal washer 100 has also been developed.

  However, in the seal washer 100 having the structure as shown in FIG. 7, both end portions 102a in the axial direction of the seal lip 102 are brought into close contact with the mating seat surface with a crushing margin corresponding to the protruding height in the axial direction from the washer body 101. Therefore, the distortion may reach the joint surface with the washer main body 101 and the seal lip 102 may be peeled off. And when such peeling arises, a sealing function will be impaired.

  The present invention has been made in view of the above points, and a technical problem thereof is to provide a seal washer that is unlikely to peel off from the washer body even when the seal lip is subjected to compression deformation. .

  The technical problem described above can be effectively solved by the present invention. That is, in the seal washer according to the first aspect of the invention, a seal lip made of a rubber-like elastic material is integrally formed on the inner periphery of the washer body, and recesses are formed on both axial sides of the inner periphery of the washer body. In addition, a plurality of through-holes communicating between the recesses are opened at predetermined intervals in the circumferential direction, and a part of the rubber-like elastic material of the seal lip is filled in the recesses and the through-holes.

  In the seal washer according to the invention of claim 2, a seal lip made of a rubber-like elastic material is integrally formed on the inner periphery of the washer body, and recesses are formed on both axial sides of the inner periphery of the washer body. An engaging portion made of a groove, a depression or an unevenness is formed in the recess, and a part of the rubber-like elastic material of the seal lip is filled in the recess.

  In the seal washer according to the invention of claim 3, a seal lip made of a rubber-like elastic material is integrally formed on the inner periphery of the washer body, and a plurality of dovetail-shaped notches are formed in the circumferential direction on the inner peripheral surface of the washer body. A part of the rubber-like elastic material of the seal lip is formed in a predetermined interval and filled in the notch.

  According to the seal washer according to the first aspect of the present invention, the joint portion of the seal lip to the washer body is formed by a part of the rubber-like elastic material filled in the recess formed in the inner peripheral portion of the washer body. The inner peripheral part of the seal is formed so as to surround from both sides and is connected by a part of the rubber-like elastic material filled in each through-hole, so that the seal lip is pressed against the mating seat with a predetermined crushing allowance. Even if it receives the compressive stress by doing, it can prevent effectively that the junction part of a seal lip peels from a washer main body. Therefore, the sealing function by the seal lip can be reliably maintained.

  According to the seal washer according to the invention of claim 2, the joint portion of the seal lip to the washer body is formed by a part of the rubber-like elastic material filled in the recess formed in the inner peripheral portion of the washer body. And is locked by a part of a rubber-like elastic material filled in an engaging portion made of a groove, a depression, or an unevenness formed in the concave portion. Since the bonding area is increased by the engaging part, even if the seal lip is pressed against the mating seat with a predetermined crushing margin, it is effective for the joint part of the seal lip to be peeled from the washer body. Can be prevented. Therefore, the sealing function by the seal lip can be reliably maintained.

  According to the seal washer according to the invention of claim 3, the joint portion of the seal lip to the washer body is a part of the rubber-like elastic material filled in the recess formed in the inner peripheral portion of the washer body. The inner peripheral portion of the washer is formed so as to surround from both sides, and is locked by a part of the rubber-like elastic material filled in the dovetail notch formed on the inner peripheral surface of the washer body. Since the adhesion area increases due to the pressure, the joint of the seal lip is effectively prevented from peeling off from the washer body even if the seal lip is subjected to compressive stress due to being pressed against the mating seat with a predetermined crushing allowance. Can do. Therefore, the sealing function by the seal lip can be reliably maintained.

  Hereinafter, a preferred embodiment of a seal washer according to the present invention will be described with reference to the drawings. FIG. 1 is a sectional perspective view showing a seal washer 10 according to the first embodiment, FIG. 2 is a sectional perspective view showing a washer body 11 in FIG. 1, and FIG. 3 is a sectional view showing a mounting state.

  A seal washer 10 shown in FIG. 1 includes a flat annular washer main body 11 and a seal lip 12 integrally formed on the inner periphery of the washer main body 11.

  The washer body 11 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 bonded to the seal lip 12 as shown in FIG. On both sides in the axial direction (thickness direction) of the inner peripheral portion 111 that is a portion, annular recesses 111a and 111b that extend continuously in the circumferential direction along the inner peripheral edge are formed, in other words, the washer body 11 is The inner peripheral portion 111 is formed thinner than the outer peripheral portion 112. The annular recesses 111a and 111b correspond to the recesses described in claim 1. A plurality of through holes 113 communicating with the annular recesses 111a and 111b are formed in the inner peripheral portion 111 at predetermined intervals in the circumferential direction.

  The seal lip 12 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, and is integrally joined to the inner peripheral portion 111 of the washer body 11. It has become. Then, a part of the rubber-like elastic material (hereinafter referred to as a rubber layer) 121 and 122 at the joint portion of the seal lip 12 with the washer body 11 is filled in the annular recesses 111a and 111b of the washer body 11, and further a part thereof. 123 (hereinafter referred to as a communication portion) is filled in each through hole 113. The surfaces of the rubber layers 121 and 122 filled in the annular recesses 111a and 111b are substantially flush with the axial end surfaces 112a and 112b of the outer peripheral portion 112 of the washer body 11.

  Both axial ends 12a and 12b in the inner peripheral portion of the seal lip 12 protrude outward from the axial end surfaces 112a and 112b (rubber layers 121 and 122) of the outer peripheral portion 112 of the washer body 11, and the protruding height thereof. h is a crushing cost necessary for the seal. Further, as shown in FIG. 3, the inner diameter of the seal lip 12 is large enough to insert a shaft portion 41 such as a bolt 4 or a rivet.

  In FIG. 3 which shows the mounting state of the seal washer 10 having the above-mentioned configuration, reference numeral 1 is an outer can, 2 is an inner can, 3 is an intermediate layer interposed between the two and 1, and in a state where they are stacked on each other Are connected by bolts 4. Specifically, the bolt 4 is loosely inserted into the bolt insertion hole 1 a of the outer can 1 whose shaft portion 41 is covered with the cylindrical portion 3 a of the intermediate layer 3, and is formed on the outer peripheral surface of the shaft portion 41. The male screw groove 41a is screwed with the female screw portion 2a formed in the inner can 2, and the head portion 42 is connected to the seal washer 10 according to the configuration of FIG. 1 on the outer peripheral side of the bolt insertion hole 1a in the outer can 1. It is pressed against the surface (seat surface 1b).

  The washer body 11 of the seal washer 10 has both axial end surfaces 112 a and 112 b in pressure contact with the seat surface 42 a of the head 42 of the bolt 4 and the seat surface 1 b of the outer can 1. 12 is in close contact with the seating surfaces 42a and 1b, with both axial ends 12a and 12a being crushed in the axial direction.

  In addition to the original function as a washer for the bolt 4, the seal washer 10 has a female screw portion 2 a through which the shaft portion 41 of the bolt 4 is inserted and a cylinder sealed in the sealed inner chamber 5 of the inner can 2. It has a function of maintaining airtightness by preventing leakage through the inner circumference of the shaped portion 3a or preventing foreign matter from entering from the outside. Since the seal lip 12 is in close contact with the seating surfaces 42a and 1b with a sufficient crushing margin h, excellent sealing performance is exhibited.

  Further, the stress due to the axial compression of the seal lip 12 also acts on the joint portion with the washer body 11, but this joint portion is formed by the rubber layers 121 and 122 and the inner peripheral portion 111 of the washer body 11. The rubber layers 121 and 122 are formed so as to be surrounded from both sides in the axial direction, and are connected to each other via connecting portions 123 filled in the through holes 113 of the washer body 11, so that the washer is caused by the compressive stress. It does not peel from the main body 11. In particular, peeling that easily occurs when the washer body 11 is made of a synthetic resin material can be effectively prevented. Therefore, the sealing function by the seal lip 12 can be reliably maintained.

  Next, FIG. 4 is a cross-sectional perspective view showing a washer body 11 as a second embodiment of the seal washer according to the present invention.

  In this embodiment, annular recesses 111a that extend continuously in the circumferential direction along the inner peripheral edge on both sides in the axial direction (thickness direction) of the inner peripheral portion 111 that is a joint portion with the seal lip 12 in the washer body 11. 111b is formed, and annular grooves 114 continuous in the circumferential direction are formed in the annular recesses 111a and 111b in place of the through-hole 113 in FIG. 2 described above. The annular groove 114 corresponds to an engaging portion including the groove according to claim 2. The other portions are the same as in the first embodiment, and the seal lip 12 is integrally formed of a rubber-like elastic material on the inner peripheral portion 111 of the washer body 11 as indicated by a one-dot chain line in the drawing. The appearance of the seal lip 12 is the same as that shown in FIG.

  A part of the rubber-like elastic material of the seal lip 12 is filled in the annular recesses 111a and 111b of the washer body 11 at the joint with the washer body 11, and a part thereof is formed in the annular recesses 111a and 111b. The annular groove 114 is filled. The surfaces of the rubber layers 121 and 122 filled in the annular recesses 111a and 111b are substantially flush with the axial end surfaces 112a and 112b of the outer peripheral portion 112 of the washer body 11.

  For this reason, the seal washer of FIG. 4 is used as a washer of the bolt 4 as in FIG. 3, for example, so that the inner peripheral portion 111 of the washer body 11 is moved on both axial sides even when the seal lip 12 is subjected to axial compression. Since the inner surfaces of the rubber layers 121 and 122 formed so as to surround the inner surface of the rubber layer 121 are firmly engaged with the annular groove 114, and the adhesion area is increased by the annular groove 114, the sealing is performed by compressive stress. The joint portion of the lip 12 does not peel from the washer body 11. In particular, peeling that easily occurs when the washer body 11 is made of a synthetic resin material can be effectively prevented. Therefore, the sealing function by the seal lip 12 can be reliably maintained.

  Next, FIG. 5 is a cross-sectional perspective view showing a washer body 11 as a third embodiment of the seal washer according to the present invention.

  In this embodiment, annular recesses 111a that extend continuously in the circumferential direction along the inner peripheral edge on both sides in the axial direction (thickness direction) of the inner peripheral portion 111 that is a joint portion with the seal lip 12 in the washer body 11. 111 b is formed, and a large number of dimples 115 are formed in the annular recesses 111 a and 111 b in place of the through-hole 113 in FIG. 2 described above. The dimple 115 corresponds to an engaging portion formed of a depression according to claim 2. The other portions are the same as in the first embodiment, and the seal lip 12 is integrally formed of a rubber-like elastic material on the inner peripheral portion 111 of the washer body 11 as indicated by a one-dot chain line in the drawing. The appearance of the seal lip 12 is the same as that shown in FIG.

  A part of the rubber-like elastic material of the seal lip 12 is filled in the annular recesses 111a and 111b of the washer body 11 at the joint with the washer body 11, and a part thereof is formed in the annular recesses 111a and 111b. A large number of dimples 115 are filled. The surfaces of the rubber layers 121 and 122 filled in the annular recesses 111a and 111b are substantially flush with the axial end surfaces 112a and 112b of the outer peripheral portion 112 of the washer body 11.

  For this reason, the seal washer of FIG. 5 is used as a washer for the bolt 4 as in FIG. 3, for example, so that the inner peripheral portion 111 of the washer main body 11 is moved on both axial sides even if the seal lip 12 is subjected to axial compression. Since the inner surfaces of the rubber layers 121 and 122 formed so as to surround each other are firmly engaged with the multiple dimples 115 and the bonding area is increased by the annular groove 114, the inner surface of the rubber layers 121 and 122 is increased by the compressive stress. The joint portion of the seal lip 12 does not peel from the washer body 11. In particular, peeling that easily occurs when the washer body 11 is made of a synthetic resin material can be effectively prevented. Therefore, the sealing function by the seal lip 12 can be reliably maintained.

  4 and 5, the annular groove 114 or a large number of dimples 115 is formed as the engaging portion. However, by forming a very large number of irregularities by roughening or the like, the inner surfaces of the rubber layers 121 and 122 are formed. And the area of adhesion can be increased. A plurality of annular grooves 114 may be formed.

  FIG. 6 is a cross-sectional perspective view showing a washer body 11 as a fourth embodiment of the seal washer according to the present invention.

  In this embodiment, annular recesses 111a that extend continuously in the circumferential direction along the inner peripheral edge on both sides in the axial direction (thickness direction) of the inner peripheral portion 111 that is a joint portion with the seal lip 12 in the washer body 11. 111b is formed, and a plurality of dovetail-shaped notches 116 are formed on the inner peripheral surface 111c at predetermined intervals in the circumferential direction. That is, each of the notches 116 has a larger circumferential width on the outer circumferential side than a circumferential circumferential width on the inner circumferential side. The other portions are the same as in the first embodiment, and the seal lip 12 is integrally formed of a rubber-like elastic material on the inner peripheral portion 111 of the washer body 11 as indicated by a one-dot chain line in the drawing. The appearance of the seal lip 12 is the same as that shown in FIG.

  A part of the rubber-like elastic material of the seal lip 12 is filled in the annular recesses 111 a and 111 b of the washer body 11 at the joint portion with the washer body 11, and is filled in the notches 116. The surfaces of the rubber layers 121 and 122 filled in the annular recesses 111a and 111b are substantially flush with the axial end surfaces 112a and 112b of the outer peripheral portion 112 of the washer body 11.

  For this reason, the seal washer of FIG. 6 is used as a washer for the bolt 4, for example, as in FIG. 3, so that the rubber layers 121 and 122 can be The portion 111 is surrounded from both sides in the axial direction, and the portion between the rubber layers 121 and 122 is firmly engaged with each notch 116 formed in a dovetail shape and bonded by the notch 116. Since the area increases, the joint portion of the seal lip 12 does not peel from the washer body 11 due to the compressive stress. In particular, peeling that easily occurs when the washer body 11 is made of a synthetic resin material can be effectively prevented. Therefore, the sealing function by the seal lip 12 can be reliably maintained.

It is a section perspective view showing the 1st form of the seal washer concerning the present invention. It is a cross-sectional perspective view which shows the washer main body in the form of FIG. It is sectional drawing which shows the example of mounting | wearing with the seal washer by the form of FIG. It is a cross-sectional perspective view which shows the washer main body of a seal washer as a 2nd form which concerns on this invention. It is a cross-sectional perspective view which shows the washer main body of a seal washer as a 3rd form which concerns on this invention. It is a cross-sectional perspective view which shows the washer main body of a seal washer as the 4th form which concerns on this invention. It is a cross-sectional perspective view which shows the seal washer by a prior art.

Explanation of symbols

10 seal washer 11 washer main body 111 inner periphery 111a, 111b annular recess (recess)
111c inner peripheral surface 112 outer peripheral part 113 through-hole 114 annular groove (engagement part)
115 Dimple (engagement part)
116 Notch 12 Seal lip 121, 122 Rubber layer 123 Contact part

Claims (3)

  A seal lip (12) made of a rubber-like elastic material is integrally formed on the inner periphery of the washer body (11), and recesses (111a, 111b) are formed on both axial sides of the inner periphery (111) of the washer body (11). Are formed, and a plurality of through holes (113) communicating between the recesses (111a, 111b) are opened at predetermined intervals in the circumferential direction, and a part of the rubber-like elastic material of the seal lip (12) is A seal washer filled in the recess (111a, 111b) and the through hole (113).   A seal lip (12) made of a rubber-like elastic material is integrally formed on the inner periphery of the washer body (11), and recesses (111a, 111b) are formed on both axial sides of the inner periphery (111) of the washer body (11). Is formed in the recesses (111a, 111b), and an engaging portion made of a groove (114), a recess (115) or an unevenness is formed, and a part of the rubber-like elastic material of the seal lip (12) is A seal washer filled in the recess (111a, 111b). A seal lip (12) made of a rubber-like elastic material is integrally formed on the inner periphery of the washer body (11), and a plurality of dovetail-shaped notches (116) are formed on the inner peripheral surface (111c) of the washer body (11). Is formed at predetermined intervals in the circumferential direction, and a part of the rubber-like elastic material of the seal lip (12) is filled in the notch (116).

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