JP6317593B2 - Sealing device - Google Patents

Description

  The present invention relates to a sealing device according to a sealing technique. The sealing device of the present invention is used in the field of automobiles (including internal combustion engines and accessories) or in the field of general industrial machinery or construction machinery. For example, in the field of automobiles, the sealing device includes a cylinder head cover and a plug tube. Plug tube gasket that seals, injection pipe seal that seals between cylinder head cover and injection pipe, grommet that seals between inverter case / PCU case and piping, or grommet that seals between FC stack case and piping Etc.

  For example, an injection pipe seal (sealing device) 51 shown in FIG. 2 is conventionally known for sealing between a cylinder head cover and an injection pipe in an internal combustion engine. This seal 51 is provided on a head cover (seal housing) 61. The opening 62 is attached to the periphery of the opening 62 and seals between the head cover 61 and the injection pipe (insertion member) 71 inserted through the cover opening 62. The periphery of the cover opening 62 is made of a rubber-like elastic body. And a sealing lip 53 that is in close contact with the injection pipe 71 are integrally provided.

  However, in this prior art, the seal 51 is detachably attached to the peripheral edge of the cover opening 62 from the inside (lower side in the figure) of the head cover 61 (the attachment direction is indicated by an arrow C). Therefore, when replacing the seal 51 with a new one, it is necessary to first remove the head cover 61 from the cylinder block (not shown) and then remove the seal 51 from the head cover 61. is there.

  In recent years, as the head cover 61 is made of resin, a part of the seal 51 is made of a resin material, and a structure in which the head cover 61 and the seal 51 are welded has been developed. When replacing the seal 51 with a new one, it is necessary to replace the head cover 61 together. Therefore, there is a disadvantage that the head cover 61 that does not need to be replaced must also be replaced.

Japanese Utility Model Publication 5-33723

  The present invention has been made in view of the above points, and an object of the present invention is to provide a sealing device that can facilitate the replacement operation of the sealing device and can replace the sealing device alone.

To achieve the above object, a sealing device according to a first aspect of the present invention is a sealing device that is mounted on a peripheral portion of an opening provided in a seal housing and seals between the seal housing and an insertion member that passes through the opening. And comprising a mounting portion that is made of a rubber-like elastic body and is attached to a peripheral portion of the opening, a seal lip that is in close contact with the insertion member, and a connecting portion that connects the mounting portion and the seal lip. The sealing device is detachably attached to the peripheral edge of the opening from the outside of the seal housing, and the seal lip is in close contact with the insertion member with respect to a lip base end connected to the connecting portion. The tip end of the lip is disposed on the front side in the mounting direction, and the inner diameter of the seal lip is the lip base end on the rear side in the mounting direction relative to the lip tip on the front side in the mounting direction. Better is larger, the mounting portion is retained and the mounting portion main body which is connected to the connecting portion, the mounting portion main body by engaging the inner edge of the peripheral portion of the opening from the peripheral edge of the opening A claw-like retaining portion and an outer peripheral side seal portion that seals between the seal housing and the mounting portion main body by being in close contact with the inner peripheral surface of the opening, and the bracket is attached to the mounting portion main body. When the sealing device is mounted on the peripheral edge of the opening, the fitting is abutted against a stepped portion provided on the peripheral edge of the opening, thereby defining the insertion depth at the time of mounting and the mounting portion main body. Is suppressed from elastically deforming in the radial direction, and a recess into which the stepped portion is fitted is provided on the outer peripheral surface of the mounting portion main body between the metal fitting and the claw-shaped retaining portion. Toss .

The sealing device according to claim 2 of the present invention is the sealing device according to claim 1 , wherein the seal housing is a head cover, an inverter case, a PCU case, or an FC stack case, and the insertion member is attached to the head cover. It is a plug tube or injection pipe to be inserted, or a pipe to be inserted into the inverter case, PCU case or FC stack case.

  In the present invention having the above-described configuration, the sealing device is detachably attached to the peripheral edge of the opening from the outside rather than the inside of the seal housing, so that the seal housing does not have to be removed from the housing such as the cylinder block. In addition, the sealing device can be detached from the seal housing or attached to the seal housing. Therefore, since it is not necessary to remove the seal housing from the housing such as the cylinder block, the replacement work of the sealing device is facilitated.

  Further, the insertion member such as an injection pipe is inserted into the inner peripheral side of the sealing device after the sealing device is mounted on the seal housing. This insertion is performed from the outside of the seal housing. In other words, the injection pipe 71 is inserted from the upper side to the lower side in the figure (the insertion direction is indicated by an arrow D). However, in the sealing device 51 of FIG. 2, the seal lip 53 has a lip distal end 53b disposed on the rear side (upper side in the drawing) in the mounting direction with respect to the lip base end 53a connected to the connecting portion 54. A tightening margin for the injection pipe 71 is set in the portion 53b. For this reason, the inner diameter of the lip tip 53b is set slightly smaller than the outer diameter of the injection pipe 71. Therefore, if the injection pipe 71 is to be inserted from above into the inner peripheral side of the sealing device 51 under such circumstances, the lower end portion of the injection pipe 71 hits the lip tip portion 53b, and thus the injection pipe 71 cannot be inserted successfully. There is concern.

  In contrast, in the present invention, as described above, the lip distal end portion is disposed not on the rear side in the mounting direction but on the front side with respect to the lip base end portion connected to the connecting portion, and the inner diameter of the seal lip is the front in the mounting direction. Since it is set larger at the lip base end on the rear side in the mounting direction than the lip tip on the side, the insertion member such as the injection pipe hits the lip tip in the form guided by the inner peripheral surface of the seal lip It is inserted without. Therefore, according to the present invention, not only the replacement operation of the sealing device but also the insertion operation of the insertion member such as the injection pipe can be facilitated.

  Further, as described above, the sealing device of the present invention has an attachment portion attached to the peripheral edge portion of the opening of the seal housing, a seal lip that is in close contact with the insertion member, and a bellows-like connection portion that connects the attachment portion and the seal lip. However, it is preferable to configure the mounting portion as follows.

  That is, the mounting portion includes a mounting portion main body connected to the connecting portion, a claw-shaped retaining portion that prevents the sealing device from coming off from the peripheral edge of the opening by engaging with an inner edge of the peripheral edge of the opening, and an opening. The seal housing and the outer peripheral side sealing portion that seals between the sealing devices are integrated with each other by being in close contact with the inner peripheral surface. A metal fitting is embedded in the mounting body. When the sealing device is mounted on the peripheral edge of the opening, the metal fitting is abutted against a step provided on the peripheral edge of the opening to regulate the insertion depth at the time of mounting. When embedded, the metal fittings act as a cored bar, so that the attachment portion main body is restrained from being elastically deformed in the radial direction. Further, a concave portion is provided on the outer peripheral surface of the mounting portion main body between the metal fitting and the claw-shaped retaining portion. The step portion is fitted into the recess. Therefore, according to this structure, the insertion depth at the time of mounting is defined by the metal fitting being abutted against the stepped portion, and the attachment main body is elastically deformed radially inward by the metal fitting acting as a metal core. Since the mounting portion main body is restrained from moving in the axial direction due to being suppressed and the stepped portion is fitted into the recess, the tightening margin for the peripheral portion of the opening is not set or set in the mounting portion main body. Even if the allowance is small, the attachment portion main body is firmly fixed to the peripheral portion of the opening. If the tightening margin is not set or the set tightening margin is small, the attachment portion main body can be easily inserted into the peripheral portion of the opening and can be easily removed from the peripheral portion of the opening. Therefore, according to the structure of the present invention, the replacement work of the sealing device can be facilitated even for such a reason.

  In the present invention, the seal housing is, for example, a head cover, an inverter case, a PCU case, or an FC stack case, and the insertion member is, for example, a plug tube that is inserted through the head cover, an injection pipe that is inserted through the head cover, or a pipe that is inserted through the inverter case. (Cooling water piping or the like), piping inserted into the PCU case (cooling water piping or the like), or piping inserted into the FC stack case (air piping or cooling water piping or the like).

  The present invention has the following effects.

  That is, as described above in the present invention, since the sealing device is detachably attached to the peripheral edge of the opening from the outside rather than the inside of the seal housing, the seal housing is removed from the housing such as the cylinder block. Even if it is not removed, the sealing device can be detached from the seal housing or attached to the seal housing. Therefore, it is not necessary to remove the seal housing from the housing such as the cylinder block, and the replacement work of the sealing device can be facilitated. Further, since the sealing device is not welded to the seal housing, it is not necessary to replace the seal housing together when replacing the sealing device with a new one, and only the sealing device can be replaced alone. In an inverter case or the like, the cooling water piping may be installed not only in the vertical direction but also in the horizontal direction or at an inclination, so that only the sealing device can be easily replaced even in a direction other than the vertical direction by the effect of the present invention. Become.

  In addition, the lip distal end is disposed not on the rear side in the mounting direction but on the front side with respect to the lip base end connected to the connecting portion, and the inner diameter of the seal lip is rearward in the mounting direction than the lip distal end on the front side in the mounting direction. Therefore, the insertion member such as an injection pipe is inserted without being abutted against the tip of the lip while being guided by the inner peripheral surface of the seal lip. Therefore, not only the replacement operation of the sealing device but also the insertion operation of the insertion member such as the injection pipe can be facilitated.

  In addition, when a fitting is embedded in the attachment body and a recess is provided between the fitting and the claw-shaped retaining portion, the fastening margin for the peripheral edge of the opening is not set or set in the attachment body. Even if the allowance is small, the attachment portion main body is firmly fixed to the peripheral portion of the opening. If the tightening margin is not set or the set tightening margin is small, the attachment portion main body can be easily inserted into the peripheral portion of the opening and can be easily removed from the peripheral portion of the opening. Therefore, according to the structure, the exchanging operation of the sealing device can be facilitated even for such a reason. For example, the exchanging operation of the sealing device can be performed manually.

  In the present invention, the seal housing is, for example, a head cover, an inverter case, a PCU case, or an FC stack case, and the insertion member is a plug tube or an injection pipe that is inserted into the head cover, or an inverter case, a PCU case, or an FC stack case. It is assumed that the pipe is inserted. Therefore, the above-mentioned effects can be obtained as plug tube gaskets, injection pipe seals or grommets used for these.

Sectional drawing of the sealing device which concerns on the Example of this invention Sectional drawing of the sealing device which concerns on a prior art example

  Next, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows a half-cut section of a sealing device 1 according to an embodiment of the present invention. The sealing device 1 according to the embodiment is specifically an injection pipe seal, that is, in order to seal between the cylinder head cover (seal housing) 61 and the injection pipe (insertion member) 71 in the internal combustion engine. It is attached to the peripheral portion of the opening 62 and is in close contact with the injection pipe 71 inserted through the opening 62, and is configured as follows. The upper side of the figure is the outside of the head cover 61 (outside of the internal combustion engine), and the lower side of the figure is the inside of the head cover 61 (inside of the internal combustion engine).

  That is, the sealing device 1 is made of a rubber-like elastic body, and has an annular attachment portion 11 attached to the peripheral portion of the cover opening 62, an annular seal lip 21 in close contact with the outer peripheral surface 71 a of the injection pipe 71, and the attachment portion 11. And an annular connecting portion 31 having a bellows shape for connecting the seal lip 21.

  Further, the sealing device 1 is detachably attached to the peripheral edge of the cover opening 62 from the outside (upper side in the drawing) of the head cover 61, and accordingly, the seal lip 21 is connected to the connecting portion 31. A lip tip 21b that is in close contact with the outer peripheral surface 71a of the injection pipe 71 with respect to the lip base end 21a is disposed on the front side in the mounting direction (downward in the figure), and the inner diameter dimension of the seal lip 21 is the front side in the mounting direction ( The lip base end portion 21a on the rear side in the mounting direction (upper side in the drawing) is set larger than the lip tip portion 21b on the lower side in the drawing, and the inner peripheral surface 21c of the seal lip 21 is the lip tip on the front side in the mounting direction. It is formed in an inclined surface shape in which the inner diameter dimension gradually increases from the portion 21b to the lip base end portion 21a on the rear side in the mounting direction.

  Further, a small lip-shaped beard lip 22 is formed integrally with the lip tip 21b, and a garter spring 23 is embedded in the lip tip 21b.

  The attachment portion 11 includes an annular attachment portion main body 12 connected to the bellows-like connection portion 31, and the attachment portion main body 12 is engaged with the inner edge 63 of the peripheral edge portion of the cover opening 62 to engage with the attachment portion main body 12. An annular retaining portion 13 having a claw shape for retaining the sealing device 1 from the peripheral portion of the cover opening 62 and a lip that seals between the head cover 61 and the sealing device 1 by being in close contact with the inner peripheral surface of the cover opening 62. A ring-shaped outer peripheral side seal portion 14 having a shape is integrally formed.

  In addition, an annular metal fitting 41 is embedded in the attachment portion main body 12. When the sealing device 1 is mounted on the peripheral edge of the cover opening 62 from the outside of the head cover 61, the metal fitting 41 is abutted against an annular stepped portion 64 provided on the peripheral edge of the cover opening 62. The depth of insertion at the time of mounting is defined, and since the metal fitting 41 acts as a metal core by embedding the metal fitting 41 in the attachment portion main body 12 in this manner, the attachment portion main body 12 is elastic in the radial direction. Deformation is suppressed.

  Further, an annular recess 15 is provided on the outer peripheral surface of the mounting portion main body 12 between the metal fitting 41 and the claw-shaped retaining portion 13, and a stepped portion (projection) 64 is fitted into the recess 15. .

  In the sealing device 1 having the above-described configuration, the sealing device 1 is detachably attached to the peripheral edge of the cover opening 62 from the outside (in the drawing, the lower side) of the head cover 61 in the direction of arrow A. Therefore, the sealing device 1 can be detached from the head cover 61 or attached to the head cover 61 without removing the head cover 61 from the cylinder block. Therefore, it is not necessary to remove the head cover 61 from the cylinder block, and therefore, the replacement work of the sealing device 1 can be facilitated accordingly.

  Further, since the sealing device 1 having the above-described configuration does not weld the sealing device 1 to the head cover 61, it is not necessary to replace the head cover 61 together when replacing the sealing device 1 with a new one, and only the sealing device 1 is used. Can be replaced alone.

  Further, the lip tip 21b is arranged not on the rear side in the mounting direction but on the front side with respect to the lip base end 21a connected to the connecting portion 31, and the inner diameter dimension of the seal lip 21 is the lip tip 21b on the front side in the mounting direction. Therefore, the injection pipe 71 is guided by the inner peripheral surface 21c of the seal lip 21 without hitting the lip tip 21b. Is inserted in the direction of arrow B from the outside. Therefore, not only the replacement operation of the sealing device 1 but also the insertion operation of the injection pipe 71 can be facilitated.

  In addition, a metal fitting 41 is embedded in the attachment main body 12 and a recess 15 is provided between the metal fitting 41 and the claw-shaped retaining portion 13. When the metal fitting 41 acts as a metal core, it is possible to prevent the mounting portion main body 12 from being elastically deformed radially inward, and when the stepped portion 64 is fitted into the recess 15, the mounting portion main body 12 is pivoted. Since the movement in the direction is suppressed, even if the fastening margin for the peripheral portion of the cover opening 62 is not set in the mounting portion main body 12 or the fastening margin set is small, the mounting portion main body 12 is not covered by the cover opening 62. Firmly fixed to the periphery. If the tightening allowance is not set or the set allowance is small, the attachment portion main body 12 can be easily inserted into the peripheral portion of the cover opening 62 and easily removed from the peripheral portion of the cover opening 62. Therefore, according to the structure, the replacement operation of the sealing device 1 can be facilitated even for such reasons, and the replacement operation of the sealing device 1 can be performed manually.

  The sealing device 1 integrally has a bellows-like connecting portion 31 between the attachment portion 11 and the seal lip 21, and the connecting portion 31 can elastically deform to follow the eccentricity of the injection pipe 71. Therefore, it may be called an eccentric seal. Further, since the object to be sealed is mainly external dust, it may be referred to as a dust seal.

DESCRIPTION OF SYMBOLS 1 Sealing device 11 Attaching part 12 Attaching part main body 13 Retaining part 14 Outer peripheral side seal part 15 Recess 21 Seal lip 21a Lip base end part 21b Lip front end part 21c Lip inner peripheral surface 22 Beard lip 23 Garter spring 31 Connecting part 41 Metal fitting 61 Head cover (Seal housing)
62 Cover opening 63 Cover inner edge 64 Stepped portion 71 Injection pipe (insertion member)
71a outer peripheral surface

Claims (2)

A sealing device that is attached to a peripheral portion of an opening provided in a seal housing and seals between the seal housing and an insertion member that passes through the opening,
It is made of a rubber-like elastic body, and integrally includes a mounting portion that is attached to the peripheral portion of the opening, a seal lip that is in close contact with the insertion member, and a connecting portion that connects the mounting portion and the seal lip.
The sealing device is detachably attached to the peripheral edge of the opening from the outside of the seal housing, and the seal lip is in close contact with the insertion member with respect to a lip base end connected to the connecting portion. The lip tip is disposed on the front side in the mounting direction, and the inner diameter of the seal lip is set larger on the lip base end on the rear side in the mounting direction than on the lip tip on the front side in the mounting direction ,
The attachment portion is a claw-shaped retaining member that prevents the attachment portion main body from coming off from the peripheral edge portion of the opening by engaging the attachment portion main body connected to the connection portion and the inner edge of the peripheral edge portion of the opening. And an outer peripheral side seal portion that seals between the seal housing and the mounting portion main body by being in close contact with the inner peripheral surface of the opening,
A metal fitting is embedded in the mounting portion main body, and the metal fitting is inserted into the opening at the periphery of the opening when the sealing device is attached to the periphery of the opening. And restraining the mounting body from elastically deforming in the radial direction,
Furthermore, the recessed part which fits the said level | step-difference part is an outer peripheral surface of the said attaching part main body, and is provided between the said metal fitting and the said nail | claw-shaped retaining part . The sealing device according to claim 1 .
The seal housing is a head cover, an inverter case, a PCU case, or an FC stack case, and the insertion member is inserted into a plug tube or an injection pipe that is inserted into the head cover, or the inverter case, the PCU case, or the FC stack case. A sealing device characterized by being a pipe.

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