JP2016037974A - gasket - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gasket showing a superior assembling characteristic against an annular groove, a stable anti-falling function and a falling prevention function.SOLUTION: This invention relates to a gasket 3 made of elastic material present between two members 1, 2 under a state in which the gasket is fitted in an annular groove 21 formed at one member 2 of the two members 1, 2 to be sealed so as to seal between the two members 1, 2. The gasket 3 comprises an annular gasket main body 30; a plurality of protrusions 31 spaced apart along a circumferential direction (a) at a side part 30a of the gasket main body 30 and formed to protrude in a width direction (b) of the gasket main body 30; and a plurality of small protrusions 32 spaced apart along the circumferential direction (a) at the protruded surfaces 31a of the protrusions 31 and protruded in the width direction (b) of the gasket main body 30. The small protrusions 32 are resiliently abutted against a groove wall 21a of the annular groove 21 under a state in which the gasket is fitted into the annular groove 21.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an elastic gasket that seals between two members in a state of being fitted into an annular groove formed in one member of two members to be sealed, for example, an engine cylinder head and a head cover. The present invention relates to a gasket interposed therebetween.

  The gasket interposed between the two members to be sealed is made of an elastic member such as rubber, and is compressed between the other member in a state of being fitted in an annular groove formed in one member. It is interposed in a state (see Patent Documents 1 to 3). Such a gasket and the annular groove are designed to have a width dimension that allows the gasket to be fitted into the annular groove with play in order to secure a clearance for the gasket accompanying elastic deformation during compression. Therefore, in the process of assembling the two members, when the gasket is fitted into the annular groove of one member and combined with the other member, the gasket may drop off, which is one factor that reduces the efficiency of the assembly work. . Further, in the process of fastening the two members, the gasket may lie down and not be in a normal compressed state, and the sealing performance may not be fully exhibited. The gaskets described in Patent Documents 1 to 3 are provided with a structure for preventing such a drop-off or a side-by-side fall.

  In Patent Document 1, a seal rubber (gasket) that is inserted into a fitting groove (annular groove) of a head cover, and a convex portion having a tooth-shaped locking groove is formed on a side portion of the gasket, It is described that the posture of the gasket is maintained when it is inserted into the fitting groove, and it is intended to prevent dropping and displacement. Further, Patent Document 2 describes a gasket in which a fall prevention convex portion is formed on a side portion of an annular gasket main body, and a small projection portion for preventing falling is formed on the convex portion surface of the fall prevention convex portion. Yes. Further, in Patent Document 3, a protruding portion that stabilizes the posture of the gasket (prevents falling) is provided continuously in the longitudinal direction of the gasket, and a plurality of drop-out preventing portions are provided at intervals in the longitudinal direction. A gasket provided with a plurality of protrusions is described.

Japanese Utility Model Publication No. 62-75262 Japanese Patent No. 3310547 Japanese Patent No. 5173732

  By the way, in the case of the gasket shown by the said patent document 1, since the clearance gap between a fitting groove is large in the part between each convex part, it is thought that the fall prevention function is not exhibited as much as the left. When the convex portions are increased to narrow the space between the convex portions, it is expected that the assembling property with respect to the locking groove is lowered. In addition, in the case of the gasket shown in Patent Document 2, each fall-preventing convex part is formed with one small protrusion part for preventing the drop-out (some of which are not formed). 1 point contact for each of the fall prevention convex portions with respect to the groove wall of the groove), there is a concern that the assembled state of the gasket becomes unstable. In this case, if the small protrusion is long enough to be in line contact along the circumferential direction of the annular groove, the fitting force with respect to the mounting groove is increased, and the assembling property is lowered. Furthermore, in the case of the gasket shown in Patent Document 3, since the protrusion for preventing the collapse is provided continuously in the longitudinal direction (circumferential direction) of the gasket, the annular shape of the gasket accompanying elastic deformation during compression is provided. There is a concern that the allowance in the groove will be reduced.

  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 good assembling property with respect to the annular groove and having a stable fall prevention function and drop-off prevention function.

  The gasket according to the present invention is an elastic gasket that is interposed between the two members in a state of being fitted in an annular groove formed in one of the two members to be sealed, and seals between the two members. An annular gasket body, a plurality of ridges formed on the side portions of the gasket body at intervals along the circumferential direction and projecting in the width direction of the gasket body, and the ridges of the ridges A plurality of small protrusions formed on the surface so as to protrude in the width direction of the gasket body, and in a state where the small protrusions are fitted in the annular groove, It is configured to elastically contact the groove wall of the annular groove.

  According to the present invention, the plurality of raised portions formed so as to rise in the width direction of the gasket body exert a function of preventing the gasket from falling when the gasket is fitted into the annular groove and interposed between the two members. . Further, when the gasket is fitted in the annular groove, the small protrusion is configured to elastically contact the groove wall of the annular groove, and this elastic contact force prevents the gasket from falling off the annular groove. In addition, since the plurality of small projections are formed on the raised surface of each raised portion at intervals along the circumferential direction, the small projections elastically contact the groove wall at a plurality of locations in the circumferential direction for each raised portion. As a result, the drop-out prevention is stably performed. In particular, the elastic contact of the plurality of small protrusions with respect to the groove wall is performed without increasing the contact area to the left, so that the fitting force at the time of fitting is not increased and the assembling property is also improved.

In the present invention, the sum of the width dimension of the gasket main body and the height height of the raised portion is smaller than the groove width dimension of the annular groove, and the width dimension of the gasket main body, the height height of the raised portion, The sum of the protrusion height dimensions of the small protrusions may be larger than the groove width dimension of the annular groove.
According to the present invention, since the sum of the width dimension of the gasket body and the height of the raised portion of the raised portion is smaller than the groove width dimension of the annular groove, the assemblability when fitting the gasket into the annular groove and assembling is improved. It is good. Further, since the sum of the width of the gasket body, the height of the raised portion of the raised portion, and the height of the protruding portion of the small protrusion is larger than the groove width of the annular groove, the gasket is fitted into the annular groove. In this case, since the small protrusions are elastically deformed and elastically contact with the groove wall, the gasket is prevented from falling off the annular groove.

In the present invention, the small protrusion may be a straight body having a substantially semicircular cross-sectional shape and extending in the depth direction of the annular groove.
According to the present invention, since the small protrusion is a straight body extending in the depth direction of the annular groove, the drop-off preventing function is more effectively exhibited. In addition, the function of preventing the bulge from falling over the small protrusion is more effectively exhibited. Furthermore, since the cross-sectional shape of the small protrusion is a semicircular shape, since the elastic contact with the groove wall is made by substantially line contact along the depth direction of the annular groove, the gasket is inserted into the annular groove. The fitting force is not increased and the assembling property is not deteriorated.

In the present invention, the small protrusion may have a substantially semispherical shape.
According to the present invention, since the small protrusion has a substantially semispherical shape, the annular groove is elastically contacted with the groove wall by a substantially point contact, so that the fitting force when the gasket is fitted into the annular groove is large. In addition, the assembling property does not deteriorate. In addition, since the point contact elastic contact of the plurality of small protrusions for each bulging part with a gap in the circumferential direction is made stable, the assembled state is stabilized and the function of preventing falling and falling off is accurately exhibited. Is done.
In this case, the plurality of small protrusions may be arranged in a staggered pattern along the circumferential direction.
According to this, since there are small protrusions on the raised surface of the protrusions with a width also in the depth direction, the approximate points of the plurality of small protrusions with respect to the groove wall of the annular groove The elastic contact of the contact is made two-dimensionally, the assembled state is further stabilized, and the function of preventing falling and falling off is more accurately exhibited.

In the present invention, the plurality of raised portions may be formed on both side portions of the gasket body. In this case, the small protrusions may be formed on at least one of the raised portions on both sides.
According to the present invention, since the plurality of raised portions are formed on both side portions of the gasket body, the fall prevention function is more effectively exhibited. Moreover, if the small protrusion part is formed in at least one of the raised parts of the both side parts, the fitting force can be inserted into the annular groove without increasing the fitting force. In addition, if the small protrusions are formed on the raised portions on both sides, the drop-off preventing function is more effectively exhibited.

  ADVANTAGE OF THE INVENTION According to this invention, the assembly property with respect to an annular groove is good, and the gasket provided with the stable fall prevention function and drop-off prevention function can be provided.

1 is a schematic plan view showing an embodiment of a gasket according to the present invention. (A) is the AA arrow expanded sectional view of FIG. 1, (b) is the BB arrow expanded sectional view of FIG. It is an arrow line view along the C line direction in Fig.2 (a). It is a figure similar to FIG. 3 of another embodiment of the gasket which concerns on this invention. FIG. 6 is an enlarged sectional view taken along line DD in FIG. 4. It is the same figure as FIG. 4 which shows the modification of the embodiment. FIG. 7 is an enlarged cross-sectional view taken along line EE in FIG. 6. It is an enlarged plan view of the principal part which shows another embodiment of the gasket which concerns on this invention. It is the same figure as FIG. 8 which shows the modification of the embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 3 show a head cover gasket interposed between a cylinder head and a head cover of an automobile engine. That is, FIGS. 1 to 3 show that the cylinder head 1 and the head cover 2 are fitted into an annular groove 21 formed in the head cover 2 which is one member of the cylinder head 1 and the head cover 2 as two members to be sealed. A head cover gasket (gasket) 3 interposed between the cylinder head 1 and the head cover 2 is shown. The cylinder head 1 is made of a metal casting, and the head cover 2 is made of an aluminum forging or a synthetic resin molding. The cylinder head 1 is fastened integrally on a cylinder block (not shown), and the upper surface thereof is a combined surface 10 with the head cover 2. The head cover 2 is integrated with the cylinder head 1 by fastening the head cover gasket 3 via the head cover gasket 3, and the lower surface thereof is a united surface 20 with the cylinder head 1. An annular groove 21 is formed in the combined surface 20 of the head cover 2 along the circumferential direction.

  The head cover gasket 3 is made of an elastic body, and is made of, for example, a rubber molded body. The head cover gasket 3 is spaced from the annular gasket body 30 and a side portion (inner side portion 30a in the illustrated example) of the gasket body 30 along the circumferential direction a and protrudes in the width direction b of the gasket body 30. A plurality of formed ridges 31... And a plurality of ridges 31 formed on the ridge surfaces 31 a of the ridges 31 so as to protrude in the width direction b of the gasket main body 30 at intervals along the circumferential direction a (illustration example). 3) small projections 32... When the head cover gasket 3 is fitted in the annular groove 21, the small protrusions 32 are configured to elastically contact the groove wall of the annular groove 21 (inner groove wall 21a in the illustrated example). In the present embodiment, the cross-sectional shape of the gasket body 30 is an ellipse or an ellipse whose major axis is directed in the depth direction c of the annular groove 21. The tops of both ends in the major axis direction of the gasket body 30 constitute a design seal line L corresponding to a design seal line (not shown) on the merged surface 10 of the cylinder head 1 and the merged surface 20 of the head cover 2. In addition, the raised portion 31 is formed in a substantially trapezoidal shape in plan view, but may have a substantially semi-oval shape or a substantially semi-elliptical shape. Further, the small protrusions 32 of the present embodiment have a substantially semicircular cross-sectional shape and are a straight body extending in the depth direction c of the annular groove 21 as shown in FIG. In the present embodiment, the sum (d1 + d2) of the width dimension d1 of the gasket body 30 and the raised height dimension d2 of the raised portion 31 is smaller than the groove width dimension d of the annular groove 21 and the width dimension d1 of the gasket body 30. The sum (d1 + d2 + d3) of the raised height dimension d2 of the raised parts and the protruding height dimension d3 of the small protrusions 32 is larger than the groove width dimension d of the annular groove 21. Due to such a dimensional relationship, in a state where the head cover gasket 3 is fitted in the annular groove 21, the small protrusions 32... Elastically contact the inner groove wall 21 a of the annular groove 21.

  A procedure for fitting the head cover gasket 30 configured as described above into the annular groove 21 of the head cover 2 and interposing between the cylinder head 1 and the head cover 2 will be described. First, the head cover 2 is placed on a work table (not shown) so that the combined surface 20 faces upward, and the head cover gasket 3 is fitted into the annular groove 21. In a state where the head cover gasket 3 is fitted in the annular groove 21, the small protrusions 32... Elastically contact the inner groove wall 21 a of the annular groove 21. Next, the head cover 2 is turned upside down and placed on the cylinder head 1 so that the combined surface 20 is combined with the combined surface 10 of the cylinder head 1. When the head cover gasket 3 is turned upside down, since the small protrusions 32 of the head cover gasket 3 are in elastic contact with the inner groove wall 21a of the annular groove 21, the head cover gasket 3 is prevented from falling off the annular groove 21 by this elastic contact force. . Moreover, since the plurality of small projections 32 are formed on the raised surface 31a of each raised portion 31 at intervals along the circumferential direction a, the small projections are formed at a plurality of locations in the circumferential direction a for each raised portion 31. 32 ... will elastically contact the inner groove wall 21a, thereby preventing dropouts stably. In particular, since the small protrusions 32 are semicircular in cross section and are a straight body extending in the depth direction c of the annular groove 21, elastic contact with the inner groove wall 21 a is substantially along the depth direction c of the annular groove 21. Since it is made by line contact, the drop-off prevention function is more effectively exhibited. In addition, due to the substantially line contact, the fitting force when the head cover gasket 3 is fitted into the annular groove 21 is not increased and the assembling property is not deteriorated. Further, the elastic contact of the plurality of small protrusions 32 to the inner groove wall 21a is performed without increasing the contact area to the left, so that the fitting force at the time of fitting does not increase and the assembling property is also good. Become.

Then, the cylinder head 1 and the head cover 2 are fastened with a bolt (not shown) so as to be in a predetermined fastening state. 2 (a) and 2 (b) indicate a state in which the cylinder head 1 and the head cover 2 are fastened to a predetermined fastening state. In this fastening process, the gasket body 30 is compressed by a predetermined fastening allowance in the fastening direction (depth direction c), the lower part is elastically deformed, and is elastically adhered to the united surface 10 of the cylinder head 10, while the upper part is It elastically deforms so as to fill the space in the annular groove 21, and elastically adheres to the outer groove wall 21b and the groove bottom wall 21c. In addition, the gasket body 30 tends to fall sideways toward the inner groove wall 21 a, but the small protrusions 32 are in elastic contact with the inner groove wall 21 a, and the small protrusions 32 are the raised surfaces 31 of the raised parts 31. Since the raised portion 31 functions like a base, the small protrusions 32 are less deformed, and this lateral fall is effectively prevented. Therefore, in a predetermined fastening state, the design seal line L of the cylinder head gasket 3 interposed between the united surface 10 of the cylinder head 1 and the united surface 20 of the head cover 2 is the design of the cylinder head 1 and the head cover 2. Deviation from the upper seal line (not shown) is suppressed, and the desired sealing function is exhibited accurately.
2 shows the original shape of the head cover gasket 3. When the cylinder head 1 and the head cover 2 are in a predetermined fastening state, the cylinder head 1 and the head cover 2 are elastically deformed as described above. Intervene in between.

  4 and 5 show another embodiment of the gasket according to the present invention. In the present embodiment, a plurality of (five in the illustrated example) small protrusions 32 are all substantially semispherical, and are spaced from the raised surface 31a of the raised portion 31 along the circumferential direction a of the gasket body 30. And are arranged in a staggered pattern alternately arranged at different depth positions in the depth direction c of the annular groove 21. In the present embodiment, since the small protrusions 32 are substantially semicircular, elastic contact with the inner groove wall 21a of the annular groove 21 is made by substantially point contact, and therefore, the annular groove 21 of the cylinder head gasket 3 is made. The fitting force at the time of fitting with respect to the sheet is not increased, and the assembling property is not deteriorated. Further, since the point contact elastic contact with the inner groove wall 21a of the plurality of small protrusions 32 for each of the raised portions 31 is made at intervals along the circumferential direction a, the assembled state is stabilized, and the collapse and The drop-off prevention function is demonstrated accurately. Further, since the plurality of small protrusions 32 are arranged in a zigzag pattern along the circumferential direction a, the protrusions 31a of the protrusions 31 have small protrusions with a width in the depth direction c. Therefore, the elastic contact of the point contact with the inner groove wall 21a of the annular groove 21 of the plurality of small protrusions 32 is made two-dimensionally, the assembled state is further stabilized, and the The drop-off prevention function is more accurately demonstrated. The width dimension d1 of the gasket main body 30, the raised height dimension d2 of the raised portion 31, and the protruding height dimension d3 of the small protruding portions 32 are set to the same dimensional relationship as in the example shown in FIGS. . Therefore, the operation and effect of this dimensional relationship are the same as in the above example. Since other configurations are the same as the example shown in FIGS. 1 to 3, the same reference numerals are given to the common parts, and descriptions of the operations and effects are omitted.

  6 and 7 show a modification of the embodiment. In this example, as in the example shown in FIGS. 4 and 5, a plurality of (three in the illustrated example) small protrusions 32... Have a substantially semispherical shape. Are arranged in one row. Also in this example, since the small protrusions 32 are substantially semi-spherical, the elastic contact with the inner groove wall 21a of the annular groove 21 is made by a substantially point contact, and therefore, the cylinder head gasket 3 is in contact with the annular groove 21. The fitting force at the time of fitting does not increase and the assembling property does not deteriorate. Further, since the point contact elastic contact with the inner groove wall 21a of the plurality of small protrusions 32 for each of the raised portions 31 is made in a line at intervals along the circumferential direction a, the assembled state is stabilized. In addition, the function of preventing falling and falling off can be exhibited accurately. Other configurations are the same as those in the example shown in FIGS. 4 and 5, and thus, common portions are denoted by the same reference numerals, and description of the operations and effects thereof is omitted here.

  8 and 9 show still another embodiment of the gasket according to the present invention and its modification. In the present embodiment, the plurality of raised portions 31 are formed on the inner and outer side portions 30 a and 30 b of the gasket body 30 at intervals along the circumferential direction a. Further, the raised portions 31 of the inner and outer side portions 30 a and 30 b are formed so as to be symmetrical with respect to the seal line L of the gasket body 30.

  In the example shown in FIG. 8, three small projections 32 are formed on the raised surface 31a of each of the inner and outer raised portions 31 so as to protrude in the width direction b of the gasket body 30, and the inner and outer small projections 32 are also formed. It is formed so as to be symmetrical with respect to the seal line L. The shape and arrangement of the small protrusions 32 in this case are the same as those in any of the examples shown in FIGS. The sum (d1 + d2 × 2) of the width dimension d1 of the gasket body 30 and the height dimension d2 of the raised portion 31 is smaller than the groove width dimension d of the annular groove 21, and the width dimension d1 of the gasket body 30 and the raised portion. The total height (d1 + d2 × 2 + d3 × 2) of the protruding height dimension d2 and the protruding height dimension d3 of the small protrusions 32 is larger than the groove width dimension d of the annular groove 21. With such a dimensional relationship, when the head cover gasket 3 is fitted in the annular groove 21, the small protrusions 32... Elastically contact the inner groove wall 21 a and the outer groove wall 21 b of the annular groove 21.

  In the example shown in FIG. 9, a plurality of small protrusions 32 are formed on the raised surface 31a of the raised portion 31 formed on the inner portion 30a of the gasket body 30 in the same manner as described above, but are formed on the outer portion 30b. The small protruding portion 32 is not formed on the raised portion 31. The sum (d1 + d2 × 2) of the width dimension d1 of the gasket body 30 and the height dimension d2 of the raised portion 31 is smaller than the groove width dimension d of the annular groove 21, and the width dimension d1 of the gasket body 30 and the raised portion. The total height (d1 + d2 × 2 + d3) of the protruding height dimension d2 and the protruding height dimension d3 of the small protrusions 32 is larger than the groove width dimension d of the annular groove 21. Due to such a dimensional relationship, in a state where the head cover gasket 3 is fitted in the annular groove 21, the small protrusions 32... Elastically contact the inner groove wall 21 a of the annular groove 21.

  In the present embodiment, since the plurality of raised portions 31 are formed on both side portions 30a and 30b of the gasket body 30, the anti-falling function is more effective due to the antagonistic action of the raised portions 31 and 31 on both the inner and outer sides. Is demonstrated. Further, as in the example shown in FIG. 8, when the small protrusions 32 are formed on the raised portions 31 and 31 of the both side portions 30a and 30b, the drop-off preventing function is more effectively exhibited. On the other hand, when the small protrusions 32 are formed on the raised portion 31 on the inner side 30a side as in the example shown in FIG. 9, the fitting of the head cover gasket 3 into the annular groove 21 increases the fitting force. Made without. Since other configurations are the same as those of the above-described embodiments, common portions are denoted by the same reference numerals, and description of operations and effects thereof is omitted here.

  In the embodiment, the example in which the gasket according to the present invention is the head cover gasket 3 that seals between the cylinder head 1 and the head cover 2 of the automobile engine is described. However, the present invention is not limited to this, and the gasket is formed on one member. Other gaskets may be used as long as they are interposed between the two members while being fitted in the annular groove and seal the two members. For example, an oil pan gasket interposed between a cylinder block and an oil pan can be used. The present invention is equally applicable to any gasket that is interposed between two members to be sealed that are similarly configured in other industrial fields, not limited to automobile engines. Moreover, the planar shape and cross-sectional shape of the gasket main body 30, the raised part 31, and the small protrusion part 32 are not limited to the example of a figure, and can be suitably changed according to the shape etc. of an object site | part. Further, the numbers and intervals of the raised portions 31 and the small protruding portions 32 are appropriately determined in consideration of the prevention of falling off, the prevention of falling down, the mounting property, and the like.

1 Cylinder head (the other member of the two members to be sealed)
2 Head cover (one member of two members to be sealed)
21 annular groove 21a, 21b groove wall 3 head cover gasket (gasket)
30 Gasket body 30a, 30b Side part 31 Raised part 31a Raised surface 32 Small protrusion part a Circumferential direction b Width direction c Depth direction d Groove width dimension d1 Gasket body width dimension d2 Raised height dimension d3 Small projection part Projection height dimension

Claims (7)

An elastic gasket that is interposed between the two members in a state of being fitted in an annular groove formed on one of the two members to be sealed, and seals between the two members,
An annular gasket body;
A plurality of raised portions formed on the side portions of the gasket body at intervals along the circumferential direction and formed to rise in the width direction of the gasket body;
A plurality of small protrusions formed on the raised surface of the raised portion at intervals along the circumferential direction and projecting in the width direction of the gasket body,
The gasket, wherein the small protrusion is configured to elastically contact a groove wall of the annular groove when fitted in the annular groove. The gasket according to claim 1,
The sum of the width dimension of the gasket body and the height height of the raised portion is smaller than the groove width dimension of the annular groove, and the width dimension of the gasket body, the height height of the raised portion, and the small protrusion portion. A gasket characterized in that the total projecting height dimension is larger than the groove width dimension of the annular groove. The gasket according to claim 1 or 2,
The small protrusion is a gasket having a substantially semicircular cross section and extending in the depth direction of the annular groove. The gasket according to claim 1 or 2,
The gasket according to claim 1, wherein the small protrusion has a substantially semispherical shape. The gasket according to claim 4,
The gasket, wherein the plurality of small protrusions are arranged in a zigzag pattern along the circumferential direction. In the gasket according to any one of claims 1 to 5,
The plurality of raised portions are formed on both side portions of the gasket main body. The gasket according to claim 6,
The gasket, wherein the small protrusion is formed on at least one of the raised portions on both sides.

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