JP2009264566A - Gasket - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To inexpensively provide a gasket not causing one-sided falling and having a plug part provided with rigidity. <P>SOLUTION: The gasket includes an annular gasket body part 3 comprising a rubber molding, and the plug part 4 integrally formed on the gasket body part 3 with it in a cutout recessed part 1b of a sealing object portion 1a. The plug part 4 includes a core bar 5 processed from sheet metal, and a rubber outer package part 6 embedded in the core bar 5 and molded integrally with the gasket body part 3. The core bar 5 includes a core bar body part 5a of a similar figure with a shape of the cutout recessed part 1b and of a shape and size for fitting in the cutout recessed part 1b, a flange part 5b bent and continuously formed so as to correspond to one 1ba of rim side parts of the cutout recessed part 1b from an edge rim part of the core bar body part 5a, and a tongue piece part 5c bent and formed by cutting and raising the core bar body part 5b in correspondence to another 1bb of the rim side parts of the cutout recessed part 1b in parallel with the flange part 5b. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a gasket, for example, a cylinder that is interposed in a combined surface of a cylinder head and a cylinder head cover having a semicircular cutout recess inevitably formed for mounting a camshaft, and is used to seal the both. The present invention relates to a head cover gasket.

For example, in a cylinder head of an automobile engine, a semicircular notch recess (semicircular) is inevitably formed on the surface to be sealed with the cylinder head cover, that is, a portion to be sealed, for camshaft mounting. Is done. Therefore, as a cylinder head cover gasket for interposing and sealing the cylinder head and the cylinder head cover, the gasket main body is integrally formed with the gasket main body and fitted into the notch recess. What consists of the integral molding of the rubber | gum which has a plug part (plug semicircular) is used. When such a cylinder head cover gasket is used, the gasket main 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, whereby the combined portion is The seal is made. Patent Documents 1 and 2 show examples of such cylinder head cover gaskets.
JP 61-167148 A Japanese Utility Model Publication No. 6-20937

  The cylinder head gasket of Patent Document 1 reinforces the plug part by embedding a cored bar in the plug part to secure a seal of the notch recess, and forms a flange on the cored bar, and on the opposite side of the flange. Forms a flange made of rubber that covers the metal core, and when fitting the plug part into the notch recess, both flanges are brought into contact with both edges (periphery sides) of the notch recess to restrict the movement of the cylinder head cover gasket. Like to do. In this case, the flange made of the metal core is in contact with one of the peripheral side portions of the notch recess, but the other is only in contact with the flange made of rubber. Was concerned about falling apart. From this point of view, the rocker cover gasket (cylinder head cover gasket) of Patent Document 2 is composed of two cored bar members, a flange is formed on each cored bar member, and both cored bar members are back-to-back. It is embedded in the plug part as a solid unit. In this case, when the plug portion is fitted into the notch recess, both flange portions are positioned so as to sandwich both sides of the peripheral edge of the notch recess, so that the above-mentioned one-side fall does not occur and rigidity is also obtained. For this reason, it is possible to ensure the sealing performance of the notch recess. However, since man-hours are required for the molding process and the fixing and integration of the both core members, it cannot be denied that the manufacturing cost is increased.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a gasket having a plug portion that does not fall down and has rigidity, at a low cost.

  The gasket according to the present invention is a gasket for sealing at least one member interposed between two members to be sealed having a notch recess at a portion to be sealed, and made of a rubber molded body. A main body portion, and a plug portion integrally formed with the gasket main body portion and fitted into the notch recess, the plug portion including a metal core processed with a metal plate and the gasket main body portion embedded in the core metal And a metal core body portion having a shape and size similar to the shape of the notch recess and capable of being inserted into the notch recess, A flange portion that is bent and coupled from the edge portion of the core metal body portion to correspond to one of the peripheral side portions of the cutout recess portion, and the core metal main body portion is cut up to correspond to the other of the peripheral side portion of the cutout recess portion. And parallel to the flange. Characterized in that it comprises a so bent formed tongues.

  In the present invention, the rubber exterior part may be connected to both surfaces of the cored bar body part through the cut and raised hole of the tongue piece part in the cored bar body part. It is also possible to provide a plurality of tongue pieces. Furthermore, a positioning through-hole for molding the rubber exterior part may be formed in the core metal main body part.

  Moreover, in this invention, when the other of the two members to be sealed is provided with a groove on the entire portion to be sealed, a portion corresponding to the portion to be sealed of the gasket main body portion. It is desirable to provide a ridge inserted into the groove. In the gasket of the present invention, the two members to be sealed are an engine cylinder head and a cylinder head cover, and the notch recess is a semicircular recess formed in the cylinder head for mounting the camshaft. Desirably adopted in some cases.

  In the gasket according to the present invention, since the gasket main body portion is formed of a rubber molded body, the two members are sealed by the elastic surface pressure of the gasket main body portion when interposed between the two members to be sealed. Further, since the plug portion is fitted in the notch recess, the notch recess is also closed and this portion is sealed. Further, the plug portion is composed of a core metal processed by sheet metal and a rubber exterior portion in which the core metal is embedded and molded integrally with the gasket main body portion. Therefore, the rubber exterior portion is reinforced by the core metal and is rigid. Even if external pressure is applied, the occlusion function is maintained without sagging. In this case, the cored bar is provided with a cored bar main body having a shape and size that is similar to the shape of the notch recess and can be inserted into the notch recess. The fitting is performed in a state where the desired shape is maintained without deformation of the rubber exterior portion. The cored bar is bent and coupled to correspond to one of the peripheral side part of the notch recess from the edge of the cored bar body part, and the notch recess A tongue piece portion that is bent and formed so as to be parallel to the flange portion, and the flange portion and the tongue piece portion are attached to both sides of the notch recess. Even if an external force is applied to the plug portion from either side of the plug portion, the plug portion is stably held without falling down. Therefore, the sealing performance at the notch recess is ensured. In addition, since the flange portion of the core metal is formed during the above-described sheet metal processing, and the tongue piece portion is formed by cutting and raising and bending, man-hours such as fixing and integration as in Patent Document 2 are required. Therefore, the gasket of the present invention including the core is easily obtained without causing an increase in manufacturing cost.

  In the present invention, when the rubber exterior part is connected to both surfaces of the core metal body part through the cut-and-raised hole of the tongue piece part in the core metal body part, the rubber exterior molded in an embedded state. The part is firmly integrated with the cored bar by the anchor effect of the connecting part, and the rubber pressure on both sides of the cored bar main body during rubber molding is kept in balance. Moreover, when the said tongue piece part is provided with two or more, the stable holding | maintenance of a plug part is made more reliably. Furthermore, when a through hole for positioning when molding the rubber exterior portion is formed in the core metal body, the core metal is placed at a predetermined position when the core metal is placed in the molding die and the rubber material is injected and molded. In this state, the rubber exterior part is molded, and the core metal is accurately embedded in a predetermined position with respect to the rubber exterior part.

  In addition, when the other two members to be sealed are provided with a groove extending over the entire circumference of the portion to be sealed, the gasket main body portion includes a protrusion that is inserted into the groove. If so, the interposition of the groove between the groove and the ridge makes it possible to more stably interpose the gasket between the two members to be sealed, and the seal between the two members to be sealed becomes more stable. Certainly done. And when the gasket of this invention is used as the cylinder head cover gasket used for the seal between the cylinder head of an engine and a cylinder head cover, the suitability improves drastically.

  The best mode for carrying out the present invention will be described below with reference to the drawings. FIG. 1 is a partially broken perspective view showing a state in which a cylinder head cover gasket as an embodiment of the gasket of the present invention is assembled to a cylinder head, and FIG. 2 shows a state in which the gasket is assembled between a cylinder head and a cylinder head cover. 1 is a cross-sectional view corresponding to the line XX in FIG. 1, FIG. 3 is a front view showing an example of a core bar used in the gasket, FIG. 4 is a cross-sectional view taken along the line Y-Y in FIG. It is the same figure as FIG. 3 which shows the modification of a metal core.

  In the illustrated example, a gasket according to the present invention is interposed between an engine cylinder head (one of the members to be sealed) 1 and a cylinder head cover (the other of the members to be sealed) 2 to seal both 1 and 2. An example of a cylinder head cover gasket A is shown. The cylinder head 1 is inevitably formed in an annular sealed target portion (a combined surface with the cylinder head cover 2) 1a at the upper end thereof for the purpose of assembling a camshaft (not shown) supported inside. The notch recess 1b is provided. Moreover, the cylinder head cover 2 is provided with an annular groove 2b extending over the entire circumference in an annular sealed target portion (a combined surface with the cylinder head 1) 2a at its lower end.

  A cylinder head cover gasket (hereinafter simply referred to as a gasket) A is an annular gasket main body 3 made of a rubber molded body having a shape matching the overall shape of each of the annular sealed target portions 1a and 2a of the cylinder head 1 and the cylinder head cover 2. And a plug portion 4 that is integrally formed with the gasket body portion 3 and elastically fitted into the notch recess 1b, and an annular gasket body 2 that is inserted into the groove 2b on the upper surface of the annular gasket body portion 3. The ridge 3a is formed. The upper part of the plug part 4 constitutes a part of the gasket body part 3. The plug part 4 includes a cored bar 5 processed by sheet metal and a rubber exterior part 6 embedded with the cored bar 5 and molded integrally with the gasket main body part 3. The metal core 5 has a shape similar to the shape of the notch recess 1b and is drawn into a substantially U-shaped cross section having an outer shape and size (slightly smaller than the notch recess 1b) that can be inserted into the notch recess. Cut the main body 5a, the flange 5b bent and coupled from the semicircular lower edge of the metal core main body 5a to one side 1ba of the peripheral edge of the cutout recess 1b, and the metal core main body 5a. A piece of tongue piece 5c that is bent so as to correspond to the other edge 1bb of the peripheral edge of the cutout recess 1b and to be parallel to the flange portion 5b is provided. The cored bar main body 5a is formed with a cut-and-raised hole 5d of the tongue piece 5c and two positioning through-holes 5e described later on both sides thereof. Since the core 5 is obtained by sheet metal processing such as drawing, punching, cutting and bending of a single core member, it can be manufactured at low cost and the manufacturing cost of the gasket A is increased. There is nothing.

  The gasket exterior 3 of the gasket body 3 and the plug 4 is made of an integrally vulcanized molded body made of a rubber material such as FKM, NBR, H-NBR, EPDM, CR, ACM, AEM, VMQ and FVMQ. The cored bar 5 is obtained by sheet metal processing of a steel plate material such as SPCC, SECC, or SUS. Here, the outline of molding and preparing the gasket A will be outlined. First, a mold (not shown) having a cavity having a shape corresponding to the gasket main body 3 and the plug part 4 is prepared, and the core metal 5 is placed in the plug part cavity (not shown). 5e is arranged in a state of being supported by positioning pins (not shown) provided in the cavity. At this time, the metal core 5 is supported in a suspended state in the plug portion cavity. Next, the unvulcanized rubber material is injected into the cavity and vulcanized to obtain a gasket A in which the gasket body 3 and the plug 4 are integrated. In the plug part 4, the core metal 5 is integrated in a substantially complete embedded state in the rubber exterior part 6. The rubber exterior part 6 covers the flange part 5 a and the tongue piece part 5 c of the core metal 5 and projects downward. A pair of parallel arc-shaped flanges 6a and 6b are formed, and further, a cavity 6c (see FIG. 2) is formed as a trace of the positioning pin. Further, in the cut-and-raised hole 5d of the tongue piece portion 5c, the rubber exterior portion 6 is connected on both surfaces of the core metal main body portion 4a, and the core metal 5 and the rubber exterior portion 6 are connected by the anchor effect of this connection portion. While strong integration is achieved, the rubber pressure of the rubber exterior portion 6 inside and outside the core metal main body portion 5a is balanced.

  As shown in FIGS. 1 and 2, the gasket A 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 cylinder head cover 2. The cylinder head cover 2 is fastened and integrated with a bolt (not shown) or the like, so that the cylinder head cover 2 is integrated between the two. At this time, the plug portion 4 of the gasket A is fitted into the notch recess 1 b of the cylinder head 1. The fitting is performed so that the flange portions 5b and 6b of the rubber exterior portion 6 containing the flange portion 5b and the tongue piece portion 5c of the metal core 5 are in contact with and along the inner and outer peripheral side portions 1ba and 1bb of the notch recess 1b. Made. Since the cored bar 5 is almost completely embedded in the rubber exterior part 6, the rubber exterior is interposed between the cored bar 5 and the fitting to the notch recess 1 b and the contact with the inner and outer peripheral side parts 1 ba and 1 bb. It is made elastic by the part 6. An annular ridge 3a formed on the upper surface of the gasket body 3 is fitted into the groove 2b of the cylinder head cover 2, and the cylinder head 1 and the cylinder head cover 2 together with the gasket body 3 are fastened by the fastening. The parts to be sealed 1a and 2a are integrated with each other in a compressed state.

  In the above-mentioned fitting state of the plug part 4, the notch recess 1 b is closed by the plug part 4. Therefore, in combination with the compression state between the cylinder head 1 and the cylinder head cover 2 of the gasket main body 3, the annular sealed target portions 1a and 2a of the cylinder head 1 and the cylinder head cover 2 are caused by the compression surface pressure. Sealed. Further, since the plug portion 4 is reinforced by the core metal 5 in which the rubber exterior portion 6 is embedded and integrated, rigidity is imparted, so that deformation such as sag does not occur even when an external force such as internal or external pressure is applied. Its occlusion function is maintained. Moreover, the plug portion 4 has the flange portions 5b and the tongue pieces 5c of the metal core 5 with respect to the notched recess portion 1b, and the flange portions 6a and 6b of the rubber exterior portion 6 including the inner and outer peripheral edge side portions 1ba of the notched recess portion 1b. Since 1bb is fitted so as to be sandwiched and abutted, even if a large force acts on the inner and outer surfaces of the plug portion 4, the flange portions 5b and the tongue portions 5c are clamped between the flange portions 6a and 6b. Due to the force, the plug portion 4 does not fall down, so that the plug portion 4 is firmly fitted and fixed to the notch recess 1b, and the above-described blocking function is more reliably maintained. Further, when a liquid gasket is applied to a portion to be sealed at the time of assembling the gasket, the liquid gasket may flow into the notch recess 1b and flow out from there, but as described above, the flange portion 6a, Since the 6b is fitted so as to sandwich and abut the inner and outer peripheral side portions 1ba and 1bb of the notch recess 1b, the liquid gasket is prevented from flowing out, and a so-called lateral flow prevention function is also achieved.

  FIG. 5 shows a modification of the metal core 5 and differs from the above in that it includes two tongue pieces 5c. Thus, when there are a plurality of tongue pieces 5c, the above-mentioned fitting and fixing to the cutout recess 1b (see FIGS. 1 and 2) of the plug portion 4 that embeds and integrates the metal core 5 is made stronger. Also in this example, the two positioning through holes 5e are provided. However, the positioning through holes 5e are formed, and a part of the two cut-and-raised holes 5d of the tongue piece 5c is formed in the rubber exterior portion 6 (FIG. 2) may be substituted for the positioning of the cored bar 5 at the time of molding. Since other configurations are the same as described above, common portions are denoted by the same reference numerals, and descriptions thereof are omitted.

  The gasket of the above embodiment is applied to a cylinder head cover gasket of an engine. However, the present invention is not limited to this, and at least one of the gaskets is interposed between two members to be sealed having a notch recess in the portion to be sealed. If the two members are sealed, the same can be applied. Further, the shape of the notch recess 1b is not limited to a semicircular shape, and may be an oval, an ellipse, a square or other shapes that are a part of a polygon. Accordingly, the outer shapes of the plug portion 4 and the cored bar 5 are Needless to say, it is set in accordance with the shape of these notch recesses 1b. Further, the shape of the flange portion 5b, the tongue piece portion 5c (cutting and raising hole 5d) and the positioning through hole 5e in the core bar 5, the tongue piece portion 5c (cutting and raising hole 5d) and the positioning through hole 5e The number is not limited to the example.

It is a partial fracture perspective view showing the state where the cylinder head cover gasket as one embodiment of the gasket of the present invention is attached to the cylinder head. It is sectional drawing corresponding to the XX arrow of FIG. 1 which shows the state which assembled | attached the gasket between the cylinder head and the cylinder head cover. It is a front view which shows an example of the metal core used for the gasket. FIG. 4 is a cross-sectional view taken along line YY in FIG. 3. It is a figure similar to FIG. 3 which shows the modification of a concentric metal.

Explanation of symbols

1 Cylinder head (member to be sealed)
1a Site to be sealed 1b Notch recess 1ba, 1bb Peripheral side of notch recess 2 Cylinder head cover (member to be sealed)
2a Site to be sealed 2b Groove 3 Gasket body 3a Projection 4 Plug 5 Core metal 5a Core metal body 5b Flange 5c Tongue piece 5d Cut-and-raise hole 5e Positioning through hole 6 Rubber exterior part A Cylinder Head cover gasket (gasket)

Claims (6)

A gasket for sealing at least one member interposed between two members to be sealed having a notch recess in the portion to be sealed;
An annular gasket body made of a molded rubber body, and a plug portion formed integrally with the gasket body portion and fitted in the notch recess,
The plug part is composed of a cored bar that is processed into a sheet metal, and a rubber exterior part that is embedded in the cored body and is molded integrally with the gasket body part. The cored bar is similar to the shape of the notch recess. And a core metal body portion having an outer shape and a size that can be fitted into the notch recess, and a bending coupling so as to correspond to one of the peripheral side portion of the notch recess from the edge portion of the core metal body portion. A flange portion and a tongue piece portion that is bent and formed so as to correspond to the other peripheral edge portion of the cutout recess and to be parallel to the flange portion. Gasket to do. The gasket according to claim 1,
A gasket characterized in that the rubber exterior part is connected to both surfaces of the cored bar body part through the cut-and-raised hole of the tongue piece part in the cored bar body part. The gasket according to claim 1 or 2,
A gasket comprising a plurality of tongue pieces. The gasket according to any one of claims 1 to 3,
The gasket according to claim 1, wherein the cored bar body is formed with a positioning through-hole for molding the rubber exterior part. The gasket according to any one of claims 1 to 4,
The other of the two objects to be sealed is provided with a groove on the part to be sealed over the entire circumference, and the part corresponding to the part to be sealed of the gasket main body is inserted into the groove. A gasket characterized by having a protruding ridge. The gasket according to any one of claims 1 to 5,
The gasket to be sealed is characterized in that the two members to be sealed are a cylinder head and a cylinder head cover of an engine, and the notch recess is a semicircular recess formed in the cylinder head for mounting a camshaft.

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