JP4292924B2 - gasket - Google Patents

Description

  The present invention relates to a gasket.

  For example, gaskets used in automobile intake manifolds (hereinafter referred to as intake manifolds) are compressed vertically by the intake manifold (groove side) and cylinder block (lid side) to prevent leakage and prevent the intake of air from the outside. used.

  For this reason, a gasket composed of a rubber-like elastic material whose cross section has a shape such as a convex shape, a rhombus shape, an elliptical shape, or a combination of irregularities is used between the intake manifold and the cylinder block.

  At this time, if the intake manifold is formed of a resin, variations in the compression direction of the gasket due to resin swell, strength, flatness, creep, and the like occur. For this reason, the gasket needs to absorb variations and satisfy the sealing function.

  There is also a problem of space saving of the intake manifold, and the groove section of the mounting groove for attaching the gasket is generally a vertically long section in which the groove depth is deeper than the groove width. For this reason, of course, the gasket has a longitudinally longer cross section than the groove cross section of the mounting groove.

  In the case of such a gasket, the convexity for the fall prevention etc. was provided in several places, and the fall of the gasket was prevented and the sealing performance was maintained (refer patent document 1).

As shown in FIG. 4, Patent Document 1 shows a gasket 101 in which a protrusion 102 for preventing a fall is provided on a side surface in the groove width direction of a mounting groove of a gasket cross section.
Japanese Patent No. 3300547

  Here, as a new user requirement, it is considered that the intake manifold and the cam cover are integrated. In this case, it is necessary to change the assembly direction of the intake manifold to the cylinder block from the vertical assembly to the oblique assembly. I came.

  When obliquely assembling, naturally, the intake manifold is obliquely slid and assembled on the cylinder block. At this time, since the gasket is a vertically long cross section, problems such as falling and biting out of the mounting groove occur.

  If the gasket collapses, the surface pressure is insufficient and the crushing allowance is insufficient, resulting in a poor seal. If the gasket sticks out of the mounting groove of the gasket, the gasket will be cut and crushed, resulting in a poor seal.

  Such a phenomenon causes a fall as shown in FIG. 5 even in the gasket 101 having the protrusion 102 for preventing the fall shown in FIG.

  The present invention has been made in view of the above prior art, and an object of the present invention is to provide a gasket that prevents the gasket from falling and biting out of the mounting groove.

  In order to achieve the above object, according to the present invention, the sealing target surface and the mounting groove are opposed to the opposing direction while being attached to a mounting groove facing the surface to be sealed and having a chamfered portion at the edge. A gasket that compresses and seals by being assembled close to each other in an oblique direction, and projects to the outside of the groove side wall of the mounting groove next to the seal portion and a seal portion that projects straight to the surface to be sealed A rib that protrudes within the width range of the chamfered portion and has a side surface facing the chamfered portion along the chamfered portion is provided.

  When the gasket is brought into contact with the surface to be sealed in the oblique assembly in which the surface to be sealed and the mounting groove are assembled obliquely close to the opposing direction, the contact portion slips. Although the gasket tends to fall due to the frictional force at that time, the rib collides with the chamfered portion of the edge of the mounting groove, and the rib is supported by the chamfered portion to prevent the gasket from further falling. Then, at the end of assembly, as the seal portion is compressed, a slip occurs between the chamfered portion and the side surface facing the chamfered portion of the rib, the rib is pushed back into the mounting groove, and the gasket The posture is re-established, and the gasket is securely stored in the mounting groove. Here, since the rib only protrudes within the width range of the chamfered portion, slippage between the side surface along the chamfered portion facing the chamfered portion of the rib and the chamfered portion is performed in all of the ribs. In other words, the biting out of the mounting groove of the rib does not occur.

  It is preferable that a flat bottom surface portion is provided in parallel with the groove bottom contacting the groove bottom of the mounting groove.

  According to this, a flat bottom face part contacts the groove bottom of a mounting groove firmly, and it can make it difficult to fall down a gasket.

  It is preferable that a concave portion that forms a recess between the seal portion and the rib and a tapered surface portion that obliquely connects the bottom surface portion and the gasket side surface portion are provided.

  According to this, the gasket can be compressed into the space of the recess or the space formed between the mounting groove and the tapered surface portion, and the filling rate can be ensured.

  It is preferable that the seal portion has an R shape in cross section.

  According to this, the surface pressure can be secured, and the sealing surface can be made uniform even if the gasket is somewhat twisted.

  The present invention prevents the rib from colliding with the chamfered portion of the edge of the mounting groove even when obliquely assembled, and the rib is supported by the chamfered portion so that the gasket does not fall further. Further, at the end of the oblique assembly, the rib is pushed back into the mounting groove, and the biting out of the mounting groove of the rib does not occur.

  Exemplary embodiments of the present invention will be described in detail below with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention only to those unless otherwise specified. Absent.

With reference to FIGS. 1-3, the gasket which concerns on embodiment of this invention is demonstrated. FIG. 1 is a sectional view showing a gasket according to an embodiment of the present invention. FIG. 2 is a cross-sectional view showing a deformation process when the gasket according to the embodiment of the present invention is assembled. FIG. 3 is a view showing a main part of the intake manifold using the gasket according to the embodiment of the present invention.

  In the present embodiment, an intake manifold (hereinafter referred to as an intake manifold) and a cam cover are integrated, and the assembly direction of the intake manifold to the cylinder block is not vertical compression but diagonal compression.

  Specifically, as shown in FIG. 3, the intake manifold 32 is integrated with a diagonally lower side of the cam cover 31. Then, the cam cover 31 is assembled to the cylinder block 33 in the vertical direction as indicated by an arrow P. At this time, since the intake manifold 32 is inclined with respect to the cylinder block 33 in an oblique direction, if the intake manifold 32 is also assembled together with the cam cover 31, the intake manifold 32 cannot be assembled vertically with the inclined opposed surface. It can be assembled while sliding diagonally (called diagonal assembly).

  The gasket 1 according to the present embodiment is applied in the case of the oblique assembly described above, and is attached to the attachment groove 32a of the intake manifold 32.

  The gasket 1 is made of an annular rubber-like elastic material. Among the rubber-like elastic materials, it is preferable that the rubber-like elastic material is composed of silicon rubber, fluorine rubber, or hydrogenated nitrile rubber.

  FIG. 1 shows a cross section of the gasket 1. The gasket 1 is attached to the attachment groove 32 a of the intake manifold 32 that faces the sealing target surface of the cylinder block 33. The mounting groove 32a has a chamfered portion 32a1 with a chamfered edge.

  The gasket 1 generally includes a seal portion 2, a rib 3, a bottom surface portion 4, a concave portion 5, and a tapered surface portion 6.

  When the seal portion 2 is mounted in the mounting groove 32a, the seal portion 2 protrudes straight from the groove bottom 32a2 to the sealing target surface side M in a straight line. The seal portion 2 has a R-shaped cross section.

  The rib 3 protrudes toward the outside of the groove side wall 32a3 of the mounting groove 32a next to the seal portion 2.

  In particular, the rib 3 protrudes outside the groove side wall 32a3 within the width range of the chamfered portion 32a1. That is, the protruding length of the rib 3 protrudes from the groove side wall 32a3 when the center of the mounting groove 32a and the center of the gasket 1 are aligned as shown in FIG. 1, but the cylinder block facing surface 32b of the chamfered portion 32a1. The edge E is not so small.

  A side surface of the rib 3 facing the chamfered portion 32a1 extends along the chamfered portion 32a1 and extends in substantially the same direction as the chamfered portion 32a1.

  Further, the ribs 3 are respectively formed on both sides of the seal portion 2 so that the gasket 1 can be reversed and attached.

  The bottom surface portion 4 is a flat plane parallel to the groove bottom 32a2 and in contact with the groove bottom 32a2 of the mounting groove 32a.

  The recess 5 forms a recess between the seal portion 2 and the rib 3. For this reason, since the seal part 2 and the rib 3 protrude on the basis of the recessed part 5, in the gasket 1 of this embodiment, the seal part 2 and the two ribs 3 protrude in three directions from the mounting groove 32a. .

  The tapered surface portion 6 is connected obliquely between the bottom surface portion 4 and the gasket side surface portion 7 so that the gasket cross-sectional width on the bottom surface portion 4 side is smaller than the gasket side surface portion 7 side. Due to the tapered surface portion 6, a space S having a triangular cross section is formed between the attachment groove 32 a and the tapered surface portion 6.

  Next, the behavior when the gasket 1 is obliquely assembled will be described with reference to FIG. FIG. 2 is an enlarged view of the periphery of the mounting groove 32a when the intake manifold 32 is assembled obliquely according to FIG.

  First, the gasket 1 is attached to the attachment groove 32 a of the intake manifold 32. Next, the cam cover is assembled to the cylinder block in the vertical direction. At this time, as shown in FIG. 2A, the inclined opposing surface is assembled obliquely in the intake manifold 32 having the mounting groove 32a.

  When the intake manifold 32 approaches the cylinder block 33, the seal portion 2 side of the gasket 1 comes into contact with the cylinder block 33. At this time, the opposed surface of the intake manifold 32 approaches the cylinder block 33 so as to slide obliquely. Then, as shown in FIG. 2 (b), the gasket 1 is dragged by the frictional force with the gasket 1 by the seal portion 2 in contact with the cylinder block 33, and the gasket 1 tends to fall down.

  However, if the gasket 1 further falls down, as shown in FIG. 2B, the rib 3 on the upper side of the figure hits the chamfered portion 32a1 at the edge of the mounting groove 32a, and the rib 3 is supported by the chamfered portion 32a1, The gasket 1 is prevented from falling further.

  At the end of the assembly of the intake manifold 32, the side surface of the rib 3 on the concave portion 5 side is compressed by the cylinder block 33 as it is compressed from the seal portion 2 side by the approaching cylinder block 33 as shown in FIG. As a result, slippage occurs between the side surface along the chamfered portion 32a1 on the chamfered portion 32a1 side (opposite the chamfered portion 32a1) of the rib 3 and the chamfered portion 32a1, and the mounting groove 32a in which the rib 3 is opened. It is pushed back in and the posture of the gasket 1 is restored.

  After that, when the intake manifold 32 and the cylinder block 33 are firmly assembled, the gasket 1 is also securely stored in the mounting groove 32a.

  Here, as shown in FIG. 1, in the gasket 1, since the rib 3 protrudes only from the groove side wall 32a3 within the width range of the chamfered portion 32a1, the side surface of the rib 3 on the chamfered portion 32a1 side and the chamfered portion 32a1. The entire rib 3 is slipped between the rib 3 and the entire rib 3 is accommodated in the mounting groove 32a, and the biting out of the mounting groove 32a of the rib 3 does not occur.

  Here, in all the states of FIGS. 2A to 2C, the bottom surface portion 4 is flat in parallel with the groove bottom 32a2, so that the flat bottom surface portion 4 firmly contacts the groove bottom 32a2 of the mounting groove 32a. In addition, the gasket 1 can be made difficult to fall.

  In addition, since the gasket 1 includes the concave portion 5 and the tapered surface portion 6, the gasket 1 is compressed into a space in the concave portion 5 and a space S having a triangular cross section formed between the mounting groove 32 a and the tapered surface portion 6. It is possible to compress to the state of FIG. 2 (c) to ensure the filling rate.

  Further, since the seal portion 2 has an R-shaped cross section, the surface pressure can be secured in the compressed state of the gasket 1 in FIGS. 2B and 2C, and the seal surface can be provided even if the gasket 1 is somewhat twisted. It can be made uniform.

  In addition, although the said embodiment demonstrated the gasket 1 attached to the attachment groove | channel 32a in the intake manifold 32, in addition to this, in the automobile industry, an auxiliary machine maker, general industry, household appliances, etc., it is diagonally assembled like the above. The effect can be exhibited in some cases.

  It can be applied to diagonally assembled gaskets in the automobile industry, accessory manufacturers, general industries, and home appliances.

It is sectional drawing which shows the gasket which concerns on embodiment of this invention. It is sectional drawing which shows the deformation | transformation progress at the time of the diagonal assembly | attachment of the gasket which concerns on embodiment of this invention. It is a perspective view which shows the principal part of the intake manifold using the gasket which concerns on embodiment of this invention. It is sectional drawing which shows the gasket of a prior art. It is sectional drawing which shows the deformation | transformation state at the time of the diagonal assembly | attachment of the gasket of a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Gasket 2 Seal part 3 Rib 4 Bottom face part 5 Recessed part 6 Tapered surface part 7 Gasket side part 31 Cam cover 32 Inner manifold 32b Cylinder block opposing surface 32a Mounting groove 32a1 Chamfered part 32a2 Groove bottom 32a3 Groove side wall 33 Cylinder block

Claims (4)

It is attached to the mounting groove that faces the surface to be sealed and has a chamfered portion on the edge, and is compressed by being assembled close to the facing direction and the mounting groove in an oblique direction. A gasket for sealing,
A seal portion projecting straight toward the surface to be sealed;
A rib that protrudes within the width range of the chamfered portion to the outside of the groove side wall of the mounting groove next to the seal portion and that faces the chamfered portion along the chamfered portion, and
A gasket characterized by comprising:   The gasket according to claim 1, further comprising a flat bottom surface parallel to the groove bottom that contacts the groove bottom of the mounting groove. A recess that forms a recess between the seal portion and the rib;
A tapered surface portion that obliquely connects between the bottom surface portion and the gasket side surface portion;
The gasket according to claim 2, further comprising:   The gasket according to claim 3, wherein the seal portion has an R-shaped cross section.

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