JP5003659B2 - Three-sided seal structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seal structure of a three-plane mating part capable of improving adhesion between a liquid gasket and a bead. <P>SOLUTION: A cylinder head gasket 4 in which the bead 4a for partitioning an area opening on the chain case side is formed, is interposed between a cylinder block and a cylinder head. While forming a groove part 1a opening on the chain case side and extending in the direction for separating from a chain case, in a part positioned inside the area while interposing the cylinder head gasket 4 in a mating face with the cylinder head of the cylinder block, a chamfering part 1b constituting a void in the three-plane mating part is formed on the edge positioned in the three-plane mating part of the cylinder block, and the liquid gasket is filled in the three-plane mating part including the void constituted of the groove part 1a and the chamfering part 1b. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a seal structure of a three-surface mating portion in which three assembly members are abutted against each other.

  In an engine for automobiles, etc., in a structure in which a chain case is attached across both end surfaces of a cylinder block and a cylinder head placed on the cylinder block, the cylinder block, the cylinder head, and the chain A three-surface mating portion is formed at a portion where the cases are butted against each other.

  These cylinder block, cylinder head, and chain case must be assembled in a liquid-tight manner. For example, a bead formed between the cylinder block and the cylinder head is slightly smaller than the mating surface of the cylinder block and the cylinder head. In addition, a liquid gasket is filled between each of the cylinder block, cylinder head, chain case and solid gasket so that the three-sided joint is sealed in a liquid-tight manner. It has been known. In such a configuration, mutual sealing is maintained by bringing the bead of the solid gasket and the liquid gasket into contact with each other.

  However, in the seal structure of such a three-sided portion, because the contact area between the bead and the liquid gasket is small, for example, the position of the cylinder block, the cylinder head, and the chain case may vary during engine operation, When a thermal displacement occurs or a relative displacement occurs between the positions, the liquid gasket peels off from the bead, and there is a problem that engine oil may leak.

  In order to solve such a problem, Patent Document 1 below provides a chamfered portion by chamfering a corner portion of the cylinder block on the three-surface mating portion side and a corner portion of the cylinder head on the three-surface mating portion side. There is disclosed a structure in which a bead of a fixed gasket is extended so that the bead and a liquid gasket filled in a chamfered portion are bonded to each other through an adhesive.

Japanese Patent Laid-Open No. 2002-257241

  However, in the seal structure of the three-surface mating portion of Patent Document 1, since the bead and the liquid gasket are bonded via an adhesive as described above, the adhesive is attached to the edge of the solid gasket. There is a possibility that the assembling process becomes complicated and the workability is lowered.

  In view of the above, an object of the present invention is to provide a seal structure of a three-sided joint that can improve the adhesion between a liquid gasket and a bead.

In order to solve the above-described problems, the seal structure of the three-surface mating portion according to the first aspect of the present invention includes a first member, a second member adjacent to the first member, the first member, and the second member. A seal structure of a three-sided joint formed by abutting a third member arranged to face the end face, and a solid gasket is interposed between the first member and the second member, The first member has a projecting portion assembled to the third member, and the solid gasket is formed with a bead so as to define an area opened on the solid member side toward the third member. the on one mating surface of at least one of said the protrusion second member, at a portion located inside the said region in a state where the solid gasket is interposed, open to the third member side And away from the third member Are formed grooves extending direction, of the protrusion or the second member to the end edge located on at least one said one of said three-surface combining portion, said from the inside of the projecting portion a predetermined outward to the three-surface combining portion A concave portion that forms a gap extending in the width is formed, the outer end portion of the concave portion is disposed so as to be located outside the solid gasket, and the tip of the bead reaches a position facing the concave portion. The three-surface mating portion that extends and includes the groove portion and the gap formed by the concave portion is filled with a liquid gasket.

With such a configuration, when the first member, the second member, and the third member are assembled to each other, the liquid gasket filled with the groove formed in the region defined by the bead is formed in the bead. The contact area between the liquid gasket and the bead is increased by the contact, thereby preventing the liquid gasket and the bead from being separated. Furthermore, by providing the groove and the recess on at least one of the mating surfaces of the first member and the second member, the liquid gasket filled in the groove and the recess has a thickness, and the elasticity of the liquid gasket in this portion The force increases, and the followability to thermal displacement and vibration of the first member, the second member, and the third member can be improved. Further, the liquid gasket filled in the groove portion and the liquid gasket filled in the concave portion come into contact with the solid gasket, respectively, so that the sealing performance at the three-surface mating portion can be further improved.

A seal structure for a three-surface mating portion according to a second invention is characterized in that, in the seal structure for a three-surface mating portion according to the first invention, the groove portion is formed to extend in parallel with the bead .

The seal structure of the three-surface mating portion according to the third invention is the seal structure of the three-surface mating portion according to the first or second invention, wherein the recess is formed by chamfering an edge located at the three-surface mating portion. It is characterized by that.

  According to the seal structure of the three-surface mating portion according to the present invention described above, the adhesion between the liquid gasket and the bead can be improved and the three-surface mating portion can be reliably sealed.

  Hereinafter, embodiments of a seal structure for a three-surface mating portion according to the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a schematic structural diagram showing an engine body to which a seal structure of a three-surface mating portion according to the present embodiment is applied. FIG. 2 is a top view of a cylinder block to which a seal structure of a three-surface mating portion according to the present embodiment is applied. 3 is an enlarged view of a part III in FIG. 1, FIG. 4 is a sectional view taken along arrow IV-IV in FIG. 3, FIG. 5 is a sectional view taken along arrow V-V in FIG. It is sectional drawing.

  This embodiment is an example in which the seal structure of the three-surface mating portion of the present invention is applied to an engine body for automobiles or the like. As shown in FIG. 1, in this embodiment, a cylinder block 1 as a first member and a cylinder head 2 as a second member disposed on the cylinder block 1 are connected to a chain case 3 as a third member. Are attached to each other to form a three-surface mating portion A. Further, a cylinder head gasket 4 is interposed between the cylinder block 1 and the cylinder head 2 as a solid gasket formed slightly smaller than the mating surface of the cylinder block 1 and the cylinder head 2.

  As shown in FIG. 2, in this embodiment, the cylinder block 1 has projecting portions 11 and 12 projecting toward the chain case 3 on both side portions on the chain case 3 side, and these projecting portions 11 and 12 are the chain case 3. It is comprised so that it may be assembled | attached.

  As shown in FIG. 3 as an example of the protruding portion 11, a groove portion 1 a and a chamfered portion 1 b as a concave portion are formed in a portion corresponding to the three-surface mating portion A of the cylinder block 1.

  The groove portion 1a is the upper surface of the cylinder block 1, that is, the mating surface with the cylinder head 2, and the inner side of the bead 4a of the cylinder head gasket 4 to be described later is opened to the chain case 3 side formed by the bead 4a. Is provided. One end of the groove 1a opens to the chain case 3 side, and the other end extends in a direction away from the chain case 3 side. That is, in this embodiment, the groove 1a is formed so as to extend in parallel to the bead 4a from the chain case 3 side. The bottom surface of the groove 1a is formed in an arc shape as shown in FIG.

  Further, the chamfered portion 1 b is provided at a corner portion of the cylinder block 1 on the chain case 3 side so that a gap is formed between the cylinder head 2 and the chain case 3. In the present embodiment, the chamfered portion 1b is formed by chamfering the corner portion on the chain case 3 side of the cylinder block 1 by a predetermined width from the inner end portion of the protruding portion 11 (12). As a result, as shown in FIG. 5, the chamfered portion 1 b is inclined so that the height of the upper surface of the cylinder block 1 becomes lower toward the chain case 3 side. Further, the chamfered portion 1 b is set so that the outer end portion thereof is located outside the cylinder head gasket 4.

  As shown in FIGS. 4 to 6, the cylinder head gasket 4 is formed by overlapping two bead substrates 41 and 42, and is formed so as to partition at least a region opened to the chain case 3 side. Beads 41a and 42a (hereinafter, beads 41a and 42a are collectively referred to as beads 4a) are provided.

  The bead 4a is arranged in a U-shape when viewed from the top along the end shape of the cylinder block 1 on the chain case 3 side. And the edge part of this bead 4a is comprised so that the center of the width direction (direction orthogonal to a paper surface in FIG. 1) of the protrusion part 11 may pass. That is, the end portion of the bead 4 a is disposed at a distance from both side surfaces 1 c and 1 d of the protruding portion 11. In addition, the groove part 1a is provided in the middle of the inner surface 1c of the protrusion part 11, and the bead 4a. Although not shown, the protrusion 12 has the same configuration.

  As shown in FIGS. 4 to 6, in the vicinity of the three-surface mating portion A, the gap between the cylinder block 1 and the cylinder head 2 and the space between the cylinder block 1 and the cylinder head 2 and the chain case 3. The liquid gasket 5 is filled in the gap and the gap between the cylinder head gasket 4 and the cylinder block 1 and the cylinder head 2 including the groove 1a and the chamfer 1b.

  That is, when assembling the cylinder block 1, the cylinder head 2 and the chain case 3 in the present embodiment, first, after applying the liquid gasket 5 to the groove 1a and the chamfer 1b so as to have a predetermined width and height, A cylinder head gasket 4 is placed on the cylinder block 1, and the cylinder head 2 is assembled on the cylinder head gasket 4. Thereafter, the cylinder block 1 and the cylinder head 2 assembled to each other are tightened by the chain case 3 to complete the assembly.

  At this time, the liquid gasket 5 applied to the groove portion 1 a and the chamfered portion 1 b in the vicinity of the three-surface mating portion A is between the cylinder block 1 and the cylinder head 2, and between the cylinder block 1 and the cylinder head 2 and the chain case 3. And the gap between the cylinder head gasket 4 and the cylinder block 1 and the cylinder head 2 to fill these gaps. Thereby, the three-surface mating part A formed by the cylinder block 1, the cylinder head 2, and the chain case 3 being butted against each other is sealed in a liquid-tight manner.

  Below, the effect by the seal structure of the three surface matching part which concerns on a present Example is demonstrated. According to the seal structure of the three-surface mating portion according to the present embodiment, the groove 4a is formed so as to be parallel to the bead 4a, and the liquid gasket 5 is filled in a region including the groove 1a, whereby the bead 4a and the liquid gasket are filled. 5, the liquid gasket 5 does not peel from the bead 4 a even if vibration or thermal displacement occurs in the cylinder block 1, cylinder head 2, or chain case 3 during engine operation. The sealing performance of the three-surface mating part A can be maintained.

  Furthermore, when the liquid gasket 5 is filled in the three-surface mating portion A including the groove portion 1a and the chamfered portion 1b, the liquid gasket 5 filled in the groove portion 1a and the chamfered portion 1b becomes thick. Therefore, the liquid gasket 5 filled in the groove portion 1a and the chamfered portion 1b has an elastic force, and the relative positions of the cylinder block 1, the cylinder head 2, and the chain case 3 are slightly shifted due to vibration and thermal displacement that occur during engine operation. Even if there is nothing, it becomes possible for the liquid gasket 5 to follow these and maintain the sealed state of the three-surface joining portion A. Thereby, oil bleeding and oil leakage at the three-surface mating portion A can be reliably prevented.

  In the above-described embodiment, the example in which the chamfered portion 1b is formed in the portion constituting the three-surface mating portion A of the cylinder block 1 as the concave portion is shown. Needless to say, the shape can be such that the liquid gasket 5 can be easily applied to the portion A, and various modifications can be made without departing from the spirit of the present invention.

  Moreover, although the example which forms the groove part 1a in the part which comprises the three-surface mating part A of the cylinder block 1 as a 1st member was shown in the Example mentioned above, for example, as shown to Fig.7 (a), a groove part is shown. Instead of 1a, a groove 2a may be formed in the portion constituting the three-surface mating portion A of the cylinder head 2 as the second member, or the three-surface mating portion A of the cylinder block 1 as shown in FIG. The groove portion 1a may be formed in a portion constituting the groove portion, and the groove portion 2a may be formed in a portion constituting the three-surface matching portion A of the cylinder head 2.

  Moreover, in the Example mentioned above, although the example which forms the chamfering part 1b (recessed part) in the part which comprises the three-surface mating part A of the cylinder block 1 as a 1st member was shown, for example, it shows to Fig.8 (a) Thus, instead of the chamfered portion 1b, a chamfered portion (recessed portion) 2b may be formed in a portion constituting the three-surface mating portion A of the cylinder head 2 as the second member, or as shown in FIG. A chamfered portion (concave portion) 1b is formed in a portion constituting the three-surface mating portion A of the cylinder block 1, and a chamfered portion (concave portion) 2b is formed in a portion constituting the three-surface mating portion A of the cylinder head 2. Also good.

  The present invention is applicable to a seal structure of a three-sided joint portion in which three assembling members are abutted against each other, such as an engine for automobiles.

1 is a schematic structural diagram showing an automobile engine or the like to which a seal structure for a three-surface mating portion according to an embodiment of the present invention is applied. It is a top view of the cylinder block to which the seal structure of the three-surface mating portion according to the embodiment of the present invention is applied. It is the III section enlarged view of FIG. 4A is a cross-sectional view taken along the line IV-IV in FIG. 3, and FIG. 4B is an enlarged view of a portion B in FIG. 4A. 5A is a cross-sectional view taken along the line V-V in FIG. 3, and FIG. 5B is an enlarged view of a portion C in FIG. 6A is a cross-sectional view taken along the line VI-VI in FIG. 3, and FIG. 6B is an enlarged view of a portion D in FIG. 6A. 7A is another example of the sectional view taken along the arrow IV-IV in FIG. 3, and FIG. 7B is still another example of the sectional view taken along the arrow IV-IV in FIG. 8A is another example of the sectional view taken along the line VV in FIG. 3, and FIG. 8B is still another example of the sectional view taken along the line VV in FIG.

Explanation of symbols

A Three-sided section 1 Cylinder block 1a Groove 1b Chamfer 2 Cylinder head 2a Groove 2b Chamfer 3 Chain case 4 Cylinder head gasket 4a Bead 5 Liquid gasket

Claims (3)

A seal structure of a three-surface mating portion formed by abutment of a first member, a second member adjacent to the first member, and a third member arranged to face the end surfaces of the first member and the second member Because
A solid gasket is interposed between the first member and the second member,
The first member has a protrusion that is assembled to the third member;
In the solid gasket, a bead is formed so as to define an area opened on the third member side on the solid gasket,
Wherein the one mating surface of at least one of said the protrusion second member, at the site where the solid gasket is located inside the said region in a state of being interposed, is open to the third member side And the groove part extended in the direction away from the said 3rd member is formed,
Wherein the at least one edge located at the one of said three-surface combining portion of the protruding portion or the second member, the concave portion constituting a predetermined width extending gap from the inside to the outside of the projecting portion in the three-surface combining portion Formed,
The outer end of the recess is disposed so as to be located outside the solid gasket, and
The tip of the bead extends to a position facing the recess,
A sealing structure for a three-surface mating portion, wherein the three-surface mating portion including the groove and the gap formed by the concave portion is filled with a liquid gasket. The groove is formed to extend in parallel with the bead.
The seal structure for a three-surface mating portion according to claim 1. The concave portion is formed by chamfering an edge located at the three-surface mating portion.
The seal structure of the three-surface mating portion according to claim 1 or 2.

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