JPH0561448U - Joint structure of intake manifold - Google Patents

Abstract

(57) [Abstract] [Purpose] To prevent the vibration generated from the internal combustion engine from being transmitted to the intake manifold side, and to reduce the noise. [Structure] A connecting material formed by sandwiching and fixing a vibration-proof rubber between the first flange and the second flange is provided between the end portion of the intake manifold and the joint portion on the internal combustion engine side, and the first flange is provided at the intake manifold side. By separately connecting the second flange to the internal combustion engine side joint portion by a bolt, the vibration generated from the internal combustion engine is generated by the vibration isolating rubber sandwiched between the first flange and the second flange. Since the vibration is absorbed and the vibration is not transmitted to the intake manifold side, noise can be reduced.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an intake manifold joint structure that is joined to supply an air-fuel mixture to an internal combustion engine.

[0002]

[Prior Art]

 Conventionally, an intake manifold provided to supply an air-fuel mixture into the combustion chamber of an internal combustion engine is joined to the internal combustion engine by an elastic material for the purpose of absorbing vibration and improving the tightness of the internal combustion engine. For example, it is general that a rubber or the like is sandwiched, and a flange portion that is circumferentially provided on the joint side of the intake manifold is integrally joined while pressing it by utilizing the elastic force of the exterior splint.

[0003]

[Problems to be solved by the device]

 However, when connecting the joint of the intake manifold to the joint of the internal combustion engine in the above-mentioned conventional one, the rubber, which is an elastic material, is sandwiched together with the bolt to improve vibration isolation and sealing performance. Although it is fixed, the vibration generated by the internal combustion engine is absorbed to some extent by the rubber, which is an elastic material that is sandwiched and fixed with the bolt, but the bolt itself that substantially joins and fixes the intake manifold and the internal combustion engine is Since the joint portion of the intake manifold and the joint portion of the internal combustion engine are integrally joined while maintaining contact with each other, the vibration generated by the internal combustion engine cannot be sufficiently blocked, and the joint portion of the intake manifold and the internal combustion engine cannot be blocked. There is a drawback that vibrations are transmitted through bolts that join the engine joints together.

Further, in order to prevent transmission of vibration by a bolt for integrally joining and fixing such joints, a bolt for integrally joining the joints is divided, and the bolts are connected by a U-shaped stay. However, since the bolts that integrally join the joints are integrally connected by U-shaped stays, the vibration is If the brim-shaped bracket is displaced due to vibration or the like due to vibration when connecting with these divided bolts, the vibration-proof effect cannot be sufficiently improved because it is transmitted through the stay. Voids are generated in the space, and the hermeticity of the joint is easily impaired.

Therefore, the present invention aims to improve the drawbacks of the above-mentioned conventional ones, and attempts to surely prevent the vibration generated from the internal combustion engine and maintain the hermeticity at the joint with a simple structure. It is a thing.

[0006]

[Means for Solving the Problems]

 For that purpose, the engine-side joint and the intake manifold end are connected to the engine-side joint and the intake manifold end through a connecting member having a vibration-proof rubber sandwiched between the first flange and the second flange. The first flange and the second flange are integrally joined by bolts to the flanges provided on the outer periphery of the part.

[0007]

[Action]

 With the above configuration, the joint portion on the internal combustion engine side and the end portion of the intake manifold mean that the first flange and the second flange on both sides sandwiching the anti-vibration rubber are connected to the joint portion on the internal combustion engine side and the end portion of the intake manifold. Since they are fixed to the flanges around the outer circumference by bolts respectively, they can be integrally joined via this connecting material, and at the same time, the internal combustion engine side joint part and the intake manifold end part have a sealing property. The vibrations generated by the internal combustion engine are reliably absorbed by the anti-vibration rubber because they are integrally connected only by the anti-vibration rubber to be raised, and noise can be reduced.

[0008]

【Example】

 The invention will be further described with reference to the embodiments shown in the drawings. (1) is a joint portion of an internal combustion engine (2) and an intake manifold (4) according to an embodiment of the present invention, and this joint portion (1) is an internal combustion engine side joint portion (3) and an intake manifold (4). 4) end portion (5) and a connecting member (9) formed by integrally joining the internal combustion engine side joint portion (3) and the intake manifold (4) end portion (5).

Then, the connecting material (9) is attached to flanges (6) and (7) provided around the outer periphery of the internal combustion engine side joint portion (3) and the end portion (5) of the intake manifold (4), respectively. On the other hand, a first flange (10) and a second flange (11), which are screwed and fixed by respective bolts (8) and are provided corresponding to the flanges (6) and (7), respectively. The anti-vibration rubber (12) is sandwiched and fixed by an adhesive agent or a rubber baking.

Since the present invention has the above-mentioned structure, when joining the internal combustion engine side joining portion and the intake manifold end portion, the first flanges on both sides sandwiching the antivibration rubber (12). The bolt (10) and the second flange (11) are respectively attached to the flange (6) (7) provided around the end portion (5) of the intake manifold (4) and the outer periphery of the internal combustion engine side joint portion (3). 8) and the nut (13), the intake manifold (4) and the internal combustion engine (2) are sealed with the vibration isolating rubber (12) via the connecting material (9). They can be joined together in the assembled state.

Furthermore, the internal combustion engine side joint portion (3) and the end portion (5) of the intake manifold (4) are connected to the first flange (10) and the second flange (11) which form the connecting material (9). The vibrations generated by the internal combustion engine (2) are reliably absorbed by the anti-vibration rubber (12) because they are sandwiched and fixed, and are integrally connected only by the anti-vibration rubber (12) that improves hermeticity. Therefore, the noise can be reduced.

By using a liquid packing, an O-ring or a gasket between the flanges (7) provided around the outer periphery of the internal combustion engine side joint portion (3), the hermeticity can be further improved. It can also be used for other couplings that require vibration proofing and hermeticity, and for the failure of mechanical joining caused by deterioration of the vibration proof rubber (12) that absorbs vibration due to heat, etc., For example, the first flange (10) and the second flange (11) sandwiching the vibration-proof rubber (12) are provided with engaging portions formed at intervals by extending the edges of the first flange (10) and the second flange (11). Even if the connecting material (9) is pulled toward the intake manifold (4) and the internal combustion engine (2) due to the failure of (12), the edges of the first flange (10) and the second flange (11) are not removed. Mutual relationship formed by extending The tightness between the intake manifold (4) and the internal combustion engine (2) is maintained by engaging and fixing the joints.

[0013]

[Effect of the device]

 As described above, by using the connecting material composed of the first flange and the second flange that sandwich the anti-vibration rubber at the place where vibration is generated greatly, for example, at the joint between the intake manifold and the internal combustion engine, the structure can be easily constructed. With this, it is possible to join them together while maintaining the airtightness, and it is possible to reduce noise without transmitting the vibration generated from the internal combustion engine to the intake manifold side.

[Brief description of drawings]

FIG. 1 is a front view of an embodiment of the present invention.

FIG. 2 is an enlarged AA cross-sectional view of a main part thereof.

[Description of Reference Signs] 1 joint 2 internal combustion engine 3 joint on internal combustion engine side 4 intake manifold 5 end of intake manifold 6 flange (on intake manifold side) flange 7 (on internal combustion engine side joint) 8 bolt 9 connecting material 10 First flange 11 Second flange 12 Anti-vibration rubber

Claims (1)

[Scope of utility model registration request] 1. An engine-side joint portion and an intake manifold through a connecting member formed by sandwiching a vibration-proof rubber between a first flange and a second flange between the joint portion on the internal combustion engine side and an end portion of the intake manifold. An intake manifold joint structure in which the first flange and the internal combustion engine side are integrally joined to the intake manifold side with respect to each flange provided on the outer circumference of the end portion by a bolt.