JP2011012794A - Head cover gasket - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a head cover gasket that can be accurately interposed between portions to be sealed of a cylinder head and a head cover without falling or slipping off when assembling the head cover to a cylinder head.SOLUTION: The head cover gasket 3 interposed between the annular portions 1a, 2a to be sealed of the cylinder head 1 and head cover 2 includes an annular gasket body part 5 formed of a molding of an elastic member and fitted into an annular recessed groove 2b formed at the portion to be sealed of the head cover, and a plug part 6 integrally formed at the gasket body part and fitted into a notched recess 1b formed at the portion to be sealed of the cylinder head. The plug part includes a core metal formed by sheet metal working, and an outer part 8 formed of the elastic member molded integrally with the gasket body part while embedding the core metal. A portion, corresponding to the portion to be sealed of the head cover, of the outer part is protrusively provided with holding pieces 81, 82, 83 elastically holding the portion to be sealed, from a width direction.

Description

  The present invention relates to a head cover gasket. More specifically, the present invention relates to a combined surface (a part to be sealed) of a cylinder head and a cylinder head cover having a semicircular cutout recess inevitably formed for camshaft mounting. The present invention relates to a head cover gasket used for sealing.

  In the cylinder head of an engine for automobiles, motorcycles (motorcycles), industrial machines, etc., in order to mount the camshaft, the united surface with the head cover at the upper end, that is, the portion to be sealed of the cylinder head A semicircular cutout recess (semicircular) is inevitably formed. Therefore, as a head cover gasket for interposing and sealing the cylinder head and the head cover, a gasket body part and a plug part formed integrally with the gasket body part and fitted in the notch recess What consists of an integrally molded object by elastic members, such as rubber | gum, which has (plug semi-circular) is used. An annular groove is formed in a portion to be sealed of the head cover, and the gasket main body has a shape that can be fitted into the groove. When such a head cover gasket is used, the gasket body portion excluding the plug portion is elastically adhered to the mating surface of the cylinder head and the cylinder head cover, and the plug portion is closely fitted to the notch recess so that the combined portion is A seal is made. Patent Documents 1 and 2 show examples of such a head cover gasket.

JP-A 61-167148 Japanese Utility Model Publication No. 6-20937

  The head cover gaskets of Patent Literature 1 and Patent Literature 2 are configured to reinforce the plug portion by embedding a cored bar in the plug portion, and to withstand internal pressure (positive pressure and negative pressure) from within the cylinder head. ing. When the head cover is assembled to the cylinder head with the cover gasket having such a configuration interposed, first, the head cover is placed on the work table so that the portion to be sealed is facing upward, and the gasket main body portion is placed in the concave groove. Fit. Then, the head cover is inverted and placed on the cylinder head, and the plug portion is fitted into the notch recess from above, and the head cover is cylinderd in a state where the portions to be sealed are combined. Fasten to the head.

  Thus, since the core part is embedded in the plug part, the specific gravity of the plug part is larger than that of other parts. Further, in a state where the gasket main body portion is fitted in the concave groove, the plug portion is erected upward. For this reason, the plug portion has a larger specific gravity than other portions, and thus becomes unstable and may be inclined or fall down. Further, when the head cover is reversed and put on the cylinder head, the gasket main body portion of this portion may come off the concave groove and fall off due to the weight of the plug portion. As described above, in the process of assembling the head cover to the cylinder head, if the plug part falls down or the gasket falls off from the head cover, the efficiency of the head cover assembling work is significantly reduced. The gaskets disclosed in Patent Document 1 and Patent Document 2 do not have a means for preventing such a fall or drop off, and a drastic improvement has been desired.

  The present invention has been made in view of the above circumstances, and when assembling the head cover to the cylinder head, the head cover gasket can be accurately interposed between the parts to be sealed without falling down or falling off. The purpose is to provide.

  The head cover gasket according to the present invention is a head cover gasket that is interposed between the respective annular sealed target portions of the cylinder head and the head cover, and is formed of a molded body of an elastic member, and is formed at the sealed target portion of the head cover. An annular gasket main body portion fitted into the annular concave groove, and a plug portion integrally formed with the gasket main body portion and fitted in a notch concave portion formed in the seal target portion of the cylinder head. The plug part includes a cored bar that has been processed by sheet metal, and an exterior part formed of the elastic member in which the cored bar is embedded and molded integrally with the gasket body part, and the cover of the head cover in the exterior part is provided. The part corresponding to the part to be sealed is provided with a projecting piece for elastically sandwiching the part to be sealed from the width direction. To.

  In the present invention, a protrusion may be formed on the surface of the clamping piece on the clamping side. Further, the core bar may be formed in a shape similar to the shape of the notch recess, and the outer shape portion may include a tongue piece portion extending within the thickness of the clamping piece. In this case, the tongue piece portion may be formed by cutting and raising, and the elastic member may be connected to each other between both surfaces of the cored bar through a cut and raised hole by the cutting and raising.

  In the present invention, a small protrusion is formed on a side portion of the gasket main body when the gasket main body is fitted in the concave groove, and is interposed between the inner wall of the concave groove in a compressed state. It is good as well.

  The head cover gasket according to the present invention is interposed between the respective sealed target portions of the cylinder head and the head cover, and seals between the sealed target portions. This head cover gasket is formed of a molded body of an elastic member, and has an annular gasket main body portion that is fitted into an annular concave groove formed in the portion to be sealed of the head cover. By being fitted in the concave groove, it is held at a position along a predetermined seal line, and by being made of an elastic member, the portion to be sealed is accurately sealed. The head cover gasket also includes a plug portion that is formed integrally with the gasket main body portion and is fitted to a notch recess formed in a portion to be sealed of the cylinder head. The gasket body portion and the plug portion are interposed between the portions to be sealed, and this portion is also reliably sealed.

  Further, since the plug portion is composed of a core metal processed by sheet metal and an exterior portion made of the elastic member embedded in the core body and molded integrally with the gasket main body portion, the plug portion is reinforced by the core metal. It can withstand the pressure applied from within the head. Further, a clamping piece for elastically sandwiching the sealed target portion in the width direction is projected from a portion of the exterior portion corresponding to the sealed target portion of the head cover, so that the head cover is attached to the cylinder head. When assembling, elastically sandwiching the clamping piece against the part to be sealed of the head cover, the head cover gasket is less likely to fall down or fall off even when the head cover is inverted, It is precisely interposed at a predetermined position between the parts to be sealed. In addition, the efficiency of the assembling work can be improved.

  If a protrusion is formed on the surface of the clamping piece on the clamping side, when the portion to be sealed of the head cover is elastically sandwiched by the clamping piece in the width direction, the plug portion is more The head cover is firmly held, and the above-described collapse and drop-off can be prevented more effectively. Moreover, if the said core metal shall be formed in the shape similar to the shape of the said notch recessed part, a plug part will be strengthened equally over substantially the whole. In addition, if the outer shape portion is provided with a tongue piece portion extending within the thickness of the sandwiching piece, the sandwiching piece is strengthened by the tongue piece portion, and the sandwiching piece is deformed during the sandwiching. There is no concern and the elastic pinching is surely expressed. In this case, if the tongue piece is formed by cutting and raising, and the elastic member is connected to each other between both surfaces of the cored bar through the cutting and raising hole by the cutting and raising, the anchor effect of this connection is achieved. Thus, strong integration between the cored bar and the exterior part is achieved.

  Further, if a small protrusion interposed between the inner wall of the concave groove and the inner wall of the concave groove is formed on the side portion of the gasket main body portion, when the gasket main body portion is fitted into the concave groove, In addition, without being affected by the dimensional accuracy (processing tolerance) of the gasket main body and the concave groove, the gasket main body is stably held in the concave groove, and when the head cover is inverted when assembled to the cylinder head, The holding force of the gasket main body portion by the concave groove is added, and the possibility of the head cover gasket falling off due to the weight of the plug portion can be further reduced.

It is a partial notch disassembled perspective view which shows the assembly structure of the cylinder head and head cover using the head cover gasket which concerns on one Embodiment of this invention. It is an enlarged plan view of the head cover gasket. (A) is the enlarged plan view of the A section in FIG. 2, (b) is the same enlarged front view. It is arrow sectional drawing corresponding to the BB line in FIG. FIG. 5 is a schematic view of only the cored bar constituting the head cover gasket of the example of FIG. 4 as viewed from the direction of arrow C in FIG. 4. It is a figure similar to FIG. 4 of other embodiment. It is the schematic which looked at only the metal core which comprises the head cover gasket of the example of FIG. 6 from the arrow D direction of FIG. (A) is a figure similar to FIG. 3 (a) of another embodiment, (b) is a figure similar to FIG.3 (b). FIG. 6 is a perspective view of a main part of a modification of the head cover gasket of the example shown in FIGS. 1 to 5.

  Embodiments of the present invention will be described below with reference to the drawings. 1 to 5 show an embodiment of the head cover gasket of the present invention. A cylinder head 1 and a head cover 2 shown in FIG. 1 constitute, for example, an engine for a motorcycle (motorcycle). Such a head cover gasket 3 is interposed in a compressed state. An annular sealed target portion 1a of the cylinder head 1 includes a semicircular cutout recess 1b that is inevitably formed for mounting a camshaft (not shown) supported inside. An annular groove 2b is formed in the annular seal target portion 2a of the head cover 2 over the entire circumference.

  The head cover gasket 3 includes a strip-shaped annular gasket base 4 that matches the overall shape of each of the annular seal target portions 1a and 2a of the cylinder head 1 and the head cover 2, and an upper surface of the annular gasket base 4 along the seal line. And an annular gasket body portion 5 having a mountain-shaped cross section, and a plug portion 6 formed integrally with the annular gasket base portion 4 and the annular gasket body portion 5 and elastically fitted to the notch recess 1b. Here, the seal line refers to an annular line in the combined portion of the cylinder head 1 and the head cover 2 and along a substantially central portion of a predetermined width to be sealed with each other. The annular gasket body 5 has a shape that can be fitted into the groove 2b of the head cover 2, and is formed of a molded body of an elastic member made of rubber or a synthetic resin (elastomer) having rubber elasticity together with the annular gasket base 4. The upper part of the plug part 6 constitutes a part of the gasket base part 4 and the gasket body part 5. The plug portion 6 includes a metal core 7 processed by sheet metal, and an exterior portion 8 made of the elastic member embedded in the metal core 7 and molded integrally with the gasket base 4 and the gasket main body 5.

The exterior portion 8 is sandwiched so as to project from the upper surface of the head cover 2 corresponding to the site to be sealed 2a so as to elastically sandwich the site to be sealed 2a in the width direction (thickness direction). The pieces 81, 82, and 83 are provided. The sandwiching piece 81 is formed in a horizontally long shape along the longitudinal direction of the gasket body 5, and the sandwiching pieces 82 and 83 are formed in a short shape spaced along the longitudinal direction of the gasket body 5, The sandwiching piece 81 and the sandwiching pieces 82 and 83 are arranged so as to face each other with an interval substantially equal to the thickness of the sealed target portion 2a. The projections 81a and 81a are provided on the two surfaces of the sandwiching piece 81 facing the sandwiching pieces 82 and 83 (surfaces on the sandwiching side). Protruding portions 82a and 83a are respectively formed at one location on the wear side surface.
4 is a cross-sectional view taken along the line BB in FIG. 3B, but both drawings are schematic views, and the dimensional relationships of the respective parts do not necessarily match.

  As shown in FIG. 5, the cored bar 7 is similar in shape to the notch recess 1b and has an outer shape and size (slightly smaller than the notch recess 1b) that can be inserted into the notch recess. A cored bar main body 70 drawn into a letter shape is provided. A tongue piece 71 extending within the thickness of the sandwiching piece 81 is formed at the upper side of the outer shape portion of the core metal main body portion 70 and located outside the cylinder head 1 so as to be folded back by cutting and raising. ing. A cut-and-raised hole 71a is formed in the metal core main body 70 by cutting and raising the tongue piece 71, and the elastic member constituting the exterior portion 8 is interposed between both surfaces of the metal core 7 through the cut-and-raised hole 71a. They are connected to each other. Thus, the elastic member of the exterior part 8 is mutually connected between both surfaces of the cored bar 7 through the cut-and-raised hole 71a, and due to the anchor effect of the connected part, the cored bar 7 and the exterior part 8 are firmly connected. Integration is achieved. In addition, tongue pieces 72 and 73 that extend within the thickness of the sandwiching pieces 82 and 83 are formed at the upper side portion of the outer shape portion of the core metal main body portion 70 and located inside the cylinder head 1. ing. Further, a narrow tongue piece 74 having a shape along the inner wall 1ba of the cylinder head 1 at the peripheral edge of the notch recess 1b from the lower edge of the outer shape of the core metal body 70 is bent and coupled. .

  The exterior portion 8 is formed so as to embed the entire cored bar 7, and the outer shape of the portion corresponding to the peripheral edge portion of the notch recess 1b is semicircular. The semicircular portion includes a flange portion 84 that includes the tongue piece portion 74 and is in close contact with the inner wall portion 1ba of the cylinder head 1, and a flange portion that is in close contact with the outer wall portion 1bb of the cylinder head 1 at the peripheral edge portion of the notch recess 1b. 85, a recess 86 is formed. In this recess 86, the peripheral edge of the notch recess 1b is fitted. Then, three small protrusions 86a along the circumferential direction are formed on the bottom of the recess 86, and in the state where the peripheral edge of the notch recess 1b is fitted, the small protrusion 86a is inside the notch recess 1b. This portion is elastically contacted with the peripheral surface, and this portion is sealed.

When the gasket main body 5 is fitted in the concave groove 2b of the head cover 2, the gasket main body 5 is interposed between the inner wall of the concave groove 2b in a compressed state. A plurality of small protrusions 5a are formed at appropriate intervals along the circumferential direction. In addition, a positioning projection 87 is formed at the approximate center of the upper side of the exterior portion 8 in the plug portion 6. A positioning hole (not shown) for receiving the positioning protrusion 87 is formed in the sealed portion 2a of the head cover 2. When the head cover gasket 3 is attached to the head cover 2, the relative position of the plug portion 6 is determined by receiving the positioning protrusion 87 in the positioning hole, and when the head cover 2 is attached to the cylinder head 1, the plug portion 6 is notched into the notch recess 1b. Will be properly fitted. In this case, the shape of the positioning protrusion 87 and the formation position thereof are not limited to those shown in the drawing. For example, the cross-sectional shape may be a shape other than a semicircular shape as shown in the figure, and the formation position may be a position along the holding piece 81 or the holding pieces 82 and 83. Accordingly, the shape and position of the positioning hole of the head cover 2 are also formed so as to match this.
In the illustrated example, the small protrusions 5a are formed on both sides of the gasket body 5, but may be formed only on either the inner or outer side.

  The elastic member constituting the head cover gasket 3 is made of rubber or synthetic resin having rubber elasticity as described above. More specifically, NBR, H-NBR, ACM, AEM, FKM, etc. are used as the rubber material. A thermoplastic elastomer (TPE) such as SBS, TPO, TPVC, TPV, TPEE, or TPAE is used as the elastic synthetic resin. Moreover, the core metal 7 is obtained by sheet metal processing of a steel plate material such as SPCC, SECC, SUS.

  As shown in FIGS. 1 and 4, the head cover gasket 3 configured as described above is disposed between the cylinder head 1 and the respective annular sealed target portions 1 a and 2 a of the head cover 2. The head cover 2 is fastened and integrated with a bolt (not shown) or the like so as to be integrated between the cylinder head 1 and the portions to be sealed 1a and 2a of the head cover 2. Prior to this fastening integration, the head cover 2 is placed on the work table so that the portion to be sealed 2a faces upward, and the plug portion 6 is positioned by the positioning projection 87 and the positioning hole, while the plug portion 6 is positioned. A portion to be sealed 2b corresponding to the notch recess 1b in the head cover 2 is press-fitted between the sandwiching piece 81 and the sandwiching pieces 82 and 83, and the portion to be sealed 2b is sandwiched between the sandwiching piece 81 and the sandwiching pieces 82 and 83. Is sandwiched more elastically than in the width direction. Since the projecting portions 81a, 81a and the projecting portions 82a, 83a are formed so as to face each other on the surface of each sandwiching piece 81, 82, 83, the projecting portions 81a, 82a, 83a Elastic restoring elasticity is applied, and the clamping is made stronger. Further, since the tongue pieces 71, 72, 73 of the cored bar 7 are embedded in the thickness of each of the holding pieces 81, 82, 83, this portion is strengthened, and the elastic reaction force is suppressed to suppress the holding pieces. A strong clamping force due to the clamping of the 81 and the clamping pieces 82 and 83 is expressed.

  Next, the gasket main body 5 is fitted into the concave groove 2b. At this time, a plurality of small protrusions 5a formed at appropriate intervals along the circumferential direction are formed on the side of the gasket main body 5. Since the gasket main body 5 is fitted so as to be interposed between the inner wall of the groove 2b in a compressed state, the gasket main body 5 is firmly held in the concave groove 2b. Therefore, despite the fact that the plug portion 6 embeds the cored bar 7 and has a large weight, the standing state is maintained by the firm clamping by the clamping piece 81 and the clamping pieces 82 and 83, and the gasket body portion Coupled with the fact that 5 is firmly held in the concave groove 2b, the plug portion 6 is stabilized, and the head cover gasket 3 does not tilt or fall during the mounting process of the head cover gasket 3 on the head cover 2.

  In this way, the head cover 2 with the head cover gasket 3 attached to the part to be sealed 2a is inverted so that it is placed on the cylinder head 1, and the plug portion 6 is fitted into the notch recess 1b of the cylinder head 1. Let Even during this reversal, the head cover gasket 3 may fall off together with the plug portion 6 due to the strong clamping state by the clamping piece 81 and the clamping pieces 82 and 83 and the holding state in the concave groove 2b of the gasket body 5. Absent. When the plug portion 6 is fitted into the notch recess 1b, the flanges 84 and 85 of the exterior portion 8 are in contact with and along the inner and outer wall portions 1ba and 1bb at the peripheral edge of the notch recess 1b. The formed small protrusion 86a is elastically brought into contact with the inner peripheral surface of the notch recess 1b. Since the cored bar 7 is completely embedded in the exterior part 8, the fitting to the notch recess 1 b and the contact with the inner and outer wall parts 1 ba and 1 bb are performed by the rubber exterior part 8 interposed between the cored bar 7. Made elastic.

  Thus, in the process from the mounting of the head cover gasket 3 to the head cover 2 to the fitting of the plug portion 6 to the notch recess 1 b, the plug portion 6 may fall down or the head cover gasket 3 may fall off together with the plug portion 6. Since there is no, it can transfer to the following fastening process smoothly. Then, by fastening the head cover 2 to the cylinder head 1 with a bolt (not shown) or the like, the gasket main body 5 is interposed in a compressed state between the parts to be sealed 1a and 2a, and the notch recess 1b and the head cover 2 are The space between the portion to be sealed 2a is closed by the plug portion 6, and a sealing structure between the cylinder head 1 and the head cover 2 is established.

  Since the plug portion 6 is reinforced by a cored bar 7 in which the exterior portion 8 is embedded and integrated, and is given rigidity, the plug portion 6 does not undergo deformation such as sag even when an external force such as internal or external pressure is applied. Function is maintained. In particular, the sandwiching pieces 82, 83 and the collar part 84 positioned inside the cylinder head 1 are formed with tongue pieces 72, 73, 74 forming a part of the core metal 7 within the thickness thereof. Even if an internal pressure is applied to the cylinder head 1, the plug portion 6 is prevented from jumping out.

FIG. 6 shows a head cover gasket according to another embodiment, and FIG. 7 conceptually shows a core bar applied to the head cover gasket. In this embodiment, the tongue piece portion 71 as in the above-described embodiment does not reach the thickness of the sandwiching piece 81 located outside the exterior portion 8, and therefore the cut-and-raised hole 71a as described above also exists. do not do. In addition, a tongue piece portion 74 that is bent at the peripheral edge portion of the outer shape portion of the cored bar main body portion 70 is formed in a fan shape having a wider angle than that of the above embodiment. The tongue piece 74 is formed so as to extend within the thickness of the flange portion 84 that is in close contact with the inner wall portion 1ba of the cylinder head 1 as described above. In the case of this embodiment, there is no effect due to the presence of the tongue piece 71 and the cut-and-raised hole 71a as in the case of the above embodiment, but there is an advantage that the metal core 7 can be easily processed into a sheet metal. Moreover, since the tongue piece part 74 is large, the said effect by this tongue piece part 74 becomes more remarkable. In addition, it is possible to enlarge the tongue piece part 74 of the said embodiment in this way.
Since other configurations are the same as those of the above-described embodiment, the same reference numerals are given to common portions, and descriptions thereof are omitted.

8 (a) and 8 (b) show still another embodiment, in which the clamping piece 81 located outside the cylinder head 1 extends along the longitudinal direction of the gasket body 5 from the example shown in FIGS. Further, it is formed wider. That is, the sandwiching piece 81 extends from the upper side portion of the exterior portion 8 so as to protrude along the longitudinal direction of the gasket body 5, and the extending portions 81 b and 81 b are formed at both ends of the sandwiching piece 81 in the longitudinal direction. Is formed. By forming the sandwiching piece 81 in such a shape, the liquid crystal gasket (not shown) of the cylinder head 1 applied to the notched corners 1bc and 1bc (see also FIG. 1) of the notched portion 1b formed in the cylinder head 1 is used. The exudation part along an outer wall part can be covered with the extension parts 81b and 81b. The notched corners 1bc and 1bc and their peripheral parts have a complicated seal structure due to their shape characteristics, and the head cover gasket 3 alone may not provide sufficient sealing performance. Therefore, in order to ensure the sealing performance, the plug portion 6 is fitted after applying the liquid gasket, but a part of the applied liquid gasket oozes along the outer wall portion of the cylinder head 1. It is inevitable to do. By covering this with the extension parts 81b and 81b sandwiched from both sides, the liquid gasket is prevented from leaking and the sealing performance of this part is maintained, the appearance is prevented from being deteriorated, or the user's clothes are soiled. Can be prevented.
Since the other configuration is the same as that of the above-described embodiment, the same reference numerals are given to the common parts, and the description thereof is omitted here.

  FIG. 9 is a modified example of the head cover gasket of the example shown in FIGS. In this example, in the exterior portion 8 similar to the above, the sandwiching piece 81 located outside the cylinder head 1 has a short shape having the same width as the one sandwiching piece 82 located inside the cylinder head 1, It is provided at a position facing the clamping piece 82. Further, a clamping piece 81 ′ having the same shape and the same size as the clamping piece 81 is provided at a position facing the other clamping piece 83 located inside the cylinder head 1. These sandwiching pieces 81, 81 ′, 82, 83 are formed with projections 81 a, 81 a ′ and projections 82 a, 83 a similar to those described above. In the exterior portion 8, a core bar 7 having the same outer shape as that described above is completely embedded, and the core bar 7 is a tongue piece extending within the thickness of the sandwiching pieces 81, 81 ′, 82, 83. Parts 71, 71 ′, 72 and 73. The tongue pieces 71 and 71 ′ are formed by cutting and raising the core body 70 in the same manner as described above, and the elastic members constituting the exterior portion 8 through the cut and raised holes 71 a and 71 a ′ by the cutting and raising. Are connected to each other between both surfaces of the cored bar 7.

  Similarly, the exterior portion 8 includes flange portions 84 and 85, and the core metal 7 has tongue pieces 74 and 75 that extend within the thickness of the flange portions 84 and 85. The tongue piece portion 74 is the same as that shown in FIGS. 3 to 5, but the tongue piece portion 75 is formed by cutting and raising the core metal main body portion 70, and through the cut and raised hole 75 a by the cut and raised portion, Elastic members constituting the exterior portion 8 are connected to each other between both surfaces of the cored bar 7.

In the case of the head cover gasket 3 of this example, the same effect as described above is obtained. In particular, since the tongue piece 75 extending into the thickness of the flange portion 85 is formed, the pressure resistance against negative pressure in the cylinder head 1 is formed. Will be strengthened. And when the notch 1b of the target cylinder head 1 is small, if the tongue piece portion is formed by cutting and raising the wide clamping piece 81 and the flange portion 85 as shown in FIGS. The cut and raised holes are overlapped, and the reinforcing effect of the cored bar 7 is reduced. Therefore, if the sandwiching piece located outside is constituted by short sandwiching pieces 81 and 81 'as illustrated, the cut-and-raised holes 81a and 81a' and the cut-and-raised 75 do not overlap, and the core While suppressing a decrease in strength of the gold 7, the core bar 7 can be easily processed.
Since other configurations are the same as described above, common portions are denoted by the same reference numerals, and descriptions thereof are omitted.

  The shape of the cutout recess 1b is not limited to a semicircular shape, and may be an ellipse, an ellipse, a square, or a shape that forms part of another polygon. The outer shapes of the plug 6 and the cored bar 7 are It is set to fit the shape of Moreover, in the example shown in FIGS. 1-5, it is also possible to reverse the relationship between the clamping piece 81 and the clamping pieces 82 and 83 from the example. The shape (including size and width), the number, and the like of the sandwiching pieces 81 (81 ′), 82, 83 can be appropriately changed as design matters. In addition, the shape and the like of the tongue pieces 74 and 75 extending to the flange portions 84 and 85 of the exterior portion 8 are not limited to those shown in the drawings, and a plurality of narrow pieces can be formed radially.

DESCRIPTION OF SYMBOLS 1 Cylinder head 1a Site to be sealed 1b Notch recess 2 Head cover 2a Site to be sealed 2b Groove 3 Head cover gasket 5 Gasket body portion 5a Small protrusion 6 Plug portion 7 Metal core 71, 72, 73 Tongue piece portion 71a Cut-up hole 8 Exterior part 81, 82, 83 Clamping piece 81a, 82a, 83a Projection part

Claims (5)

A head cover gasket interposed between each of the annular sealed target portions of the cylinder head and the head cover,
An elastic gasket molded body, which is formed integrally with the gasket main body portion, and an annular gasket main body portion that is fitted in an annular concave groove formed in the portion to be sealed of the head cover. A plug portion fitted in a notch recess formed in a site to be sealed,
The plug part is composed of a metal core processed sheet metal, and an exterior part by the elastic member embedded in the metal core and molded integrally with the gasket main body part,
A head cover gasket characterized in that a clamping piece for elastically sandwiching the portion to be sealed from the width direction is provided at a portion corresponding to the portion to be sealed of the head cover in the exterior portion. The head cover gasket according to claim 1,
A head cover gasket, wherein a protrusion is formed on a surface of the clamping piece on the clamping side. The head cover gasket according to claim 1 or 2,
The core metal is formed in a shape similar to the shape of the notch recess, and the outer shape portion thereof is provided with a tongue piece portion extending within the thickness of the clamping piece. The head cover gasket according to claim 3,
The gasket is characterized in that the tongue piece is formed by cutting and raising, and the elastic member is interconnected between both surfaces of the metal core through a cut and raised hole by the cutting and raising. The head cover gasket according to any one of claims 1 to 4,
A small protrusion is formed on a side portion of the gasket main body when the gasket main body is fitted in the concave groove so as to be interposed between the inner wall of the concave groove in a compressed state. And head cover gasket.

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