JPH11280572A - Air duct supporting structure for engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively suppress vibration of an air duct by elastically supporting an intake manifold to an engine main body through a first elastically supporting means, and elastically supporting one end of the air duct whose the other end is connected to the intake manifold to the engine main body through a second elastically supporting means. SOLUTION: In an air duct 2 crossing an upper part of an engine main body, an upstream side duct 18 is fastened to the upstream side end part 21 of the air duct 2 through a bolt 19, and a downstream side end part 22 is connected to an inlet of a turbo charger through a downstream side duct 16. In this case, a flange part of an intake manifold 3 is elastically supported to a cylinder head 1 through elastically supporting means 60 including a spring 65 interposed between a nut 64 and the elastically supporting means 60. The upstream side end part 21 is fixedly connected to the intake manifold 3 through connecting means 40, the downstream side end part 22 is elastically supported to the cylinder head 1, and a stay part 25 of the air duct 2 is elastically supported by elastically supporting means 50 for elastically supporting through bushes 51, 52.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in an engine air duct support structure.

[0002]

2. Description of the Related Art For example, in an engine having a turbocharger attached to an engine body and an air cleaner attached to a vehicle body, it is necessary to attach an air duct connecting the turbocharger and an intercooler to the engine body.

Heretofore, as an air duct mounting structure for this type of engine, there have been ones in which the air duct is fixedly supported on the engine body or the air duct is elastically supported at a plurality of points via bushes. Further, as a structure for mounting the intake manifold to the cylinder head, a structure employing a vibration isolation structure has been proposed, for example, in Japanese Utility Model Laid-Open No. 58-113.
No. 862, Japanese Utility Model Application Laid-Open No. 61-73051, Japanese Utility Model Application Laid-Open No. 58-109550, Japanese Utility Model Application Laid-Open No. 62-154267.
And Japanese Unexamined Utility Model Publication No. Sho 58-113862.

[0004]

However, in a truck engine or the like having a heavy metal air duct, it is necessary to secure the rigidity of supporting the air duct.
There is a problem that it is difficult to balance vibration transmitted from the engine body to the air duct.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and has as its object to provide a structure for mounting an air duct of an engine, which secures rigidity of supporting the air duct and sufficiently suppresses vibration transmitted from the engine body to the air duct. I do.

[0006]

According to a first aspect of the present invention, there is provided an engine having an air duct for guiding intake air across an upper portion of an engine body and an intake manifold for distributing intake air to each intake port of the engine body. Applies to air duct support structures.

A first elastic supporting means for supporting the intake manifold on the engine body via an elastic material;
A connecting means for supporting the air duct on the intake manifold and a second elastic supporting means for supporting the air duct on the engine body via an elastic material are provided.

According to a second aspect of the present invention, there is provided an air duct supporting structure for an engine according to the first aspect, wherein the first elastic support means includes an intake manifold, a gasket with a rubber interposed in the engine body, and an intake manifold. A spring that presses against the engine body is provided.

According to a third aspect of the present invention, in the air duct support structure for an engine according to the first or second aspect, a stay portion protruding from the air duct and a hole of the stay portion are fitted as the first elastic support means. A bush, a sleeve inserted into the bush, and a bolt for fastening the sleeve to the engine body are provided.

[0010]

In the engine air duct support structure according to the first aspect, the intake manifold is elastically supported by the engine body via the first elastic support means, and one end of the air duct is an intake manifold. And the other end is elastically supported via a second elastic support means with respect to the engine main body, thereby securing the support rigidity of the air duct and the engine main body. Is prevented from being transmitted to the air duct, and the vibration of the air duct can be effectively suppressed.

In the engine air duct support structure according to the second aspect, the intake manifold is sandwiched between the rubber of the gasket and the spring and is elastically fastened, whereby vibration of the engine body is transmitted to the intake manifold. Can be suppressed.

In the engine air duct supporting structure according to the third aspect, the stay portion of the air duct is elastically supported via the bush, so that the vibration of the engine body is prevented from being transmitted to the air duct.

[0013]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in FIGS. 1 and 2, an air duct 2 is provided to cross over the in-line six-cylinder engine body, while an air cleaner (not shown) is provided on the left side of the engine body, and the air cleaner is attached to the vehicle body. . An upstream duct 18 is fastened to the upstream end 21 of the air duct 2 via six bolts 19. One end of a rubber hose (not shown) is fitted to the upstream duct 18, and the other end of the rubber hose is connected to the air cleaner. It is connected.

The turbocharger 9 is mounted on the right side wall of the cylinder head 1, and the downstream end 22 of the air duct 2 is connected to the inlet of the turbocharger 9 via the downstream duct 16.

An intercooler (not shown) is provided in front of the engine body, and the intercooler is mounted on the vehicle body. The duct 15 connected to the outlet of the turbocharger 9 is connected to the inlet of the intercooler via a rubber hose (not shown) or the like.

An intake manifold 3 is mounted on the left side wall of the cylinder head 1. An inlet of the intake manifold 3 is connected to an outlet of an intercooler via an air heater 8 and a rubber hose (not shown).

The intake air taken in from the air cleaner is guided to the turbocharger 9 via the upstream duct 18, the air duct 2 and the downstream duct 16, as indicated by white arrows in the drawing. The intake air discharged from the turbocharger 9 is guided to each cylinder via a rubber hose, an air heater 8 and the intake manifold 3.

The air duct 2 and the upstream duct 18 are each formed by casting using an aluminum alloy as a material. FIG.
As shown in the figure, the air duct 2 is provided with a duct portion 20 for guiding intake air.
Is formed in a curved shape, and its upstream end 21 opens toward the left side of the engine, and its downstream end 22 opens toward the front of the engine. In the air duct 2, a resonator chamber 23 is defined at a rear portion of the duct section 22. The resonator chamber 23 and the duct section 20 communicate with each other through a resonator hole 24, so that intake noise in a predetermined frequency range is reduced by a resonance effect.

The intake manifold 3 is made of aluminum alloy by casting. The intake manifold 3 has six branch portions 43 branched for each cylinder,
A collector section 42 for distributing intake air to each branch section 43;
It has a flange portion 41 and the like joined to the cylinder head 1.

Flange 4 of intake manifold 3
1 is elastically supported by the cylinder head 1 via the first elastic support means 60. As shown in FIG. 6, the first elastic support means 60 is provided on the flange 4 of the intake manifold 3.
A pair of rubber gaskets 10 interposed between the cylinder head 1 and the engine-side flange portion, fourteen stud bolts 67 screwed to the cylinder head 1, and each stud bolt 67
Nut 64 screwed into the nut, the nut 64 and the flange 41
And a spring 65 interposed therebetween in a compressed state.

Each stud bolt 67 is provided vertically above and below the six intake ports. Between the engine side flange portion and the intake manifold 3, two gaskets 10 having the same shape are provided side by side in the front-rear direction.

As shown in FIG. 7, the gasket 10 has a flat core 11 and rubbers 12 bonded to both surfaces of the core 11. Each rubber 12 is formed in an annular shape so as to surround an opening edge of each intake port, and two beads 13 are engraved on a joining surface of the rubber 12 to the cylinder head 1 or the intake manifold 3.

As shown in FIG. 3, the upstream end 21 of the air duct 2 is fixedly connected to the intake manifold 3 via a connecting means 40. The connecting means 40 includes an upstream duct 18 connected to the upstream end of the air duct 2, two bolts 45 for fastening the upstream duct 18 to the intake manifold 3, and the like. The intake manifold 3 has a boss portion 46 into which each bolt 45 is screwed.

A second elastic support means 50 for elastically supporting the downstream end 22 of the air duct 2 with respect to the cylinder head 1 is provided. As shown in FIG. 5, the second elastic support means 50 includes a stay 25 protruding downward from the downstream end 22 of the air duct 2, and a first bush 51 and a second bush 51 fitted into the hole 26 of the stay 25. Bush 52 and each bush 5
1, 52 and a second bush 5
2 and a bolt 55 which is inserted into the washer 54 and the sleeve 53 and screwed into the cylinder head 1.

Each of the bushes 51 and 52 is formed in a cylindrical shape with a flange made of an elastic material such as rubber. The flange 56 of the first bush 51 is sandwiched between the stay 25 and the cylinder head 1, and the flange 57 of the second bush 52 is sandwiched between the stay 25 and the washer 54. The sleeve 53 has one end in contact with the cylinder head 1 and the other end in contact with the washer 54, thereby regulating the amount of compression of each bush 51, 52.

The bolt 55, the sleeve 53, and the bushes 51, 52 are arranged horizontally, and the stay 25 is arranged vertically.

Next, the operation of the embodiment of the present invention configured as described above will be described.

The first elastic support means 60 sandwiches the intake manifold 3 between the rubber 12 of the gasket 10 and the spring 65 and supports it elastically, so that the vibration of the cylinder head 1 is transmitted to the intake manifold 3. Can be suppressed.

The second elastic support means 50 connects the stay 25 of the air duct 2 to the first bush 51 and the second bush 5.
By elastically supporting the cylinder head 2, transmission of vibration of the cylinder head 1 to the air duct 2 is suppressed.

The air duct 2 has its upstream end 21 fixedly connected to the intake manifold 3 via a connecting means 40, and its downstream end 22 has a second elastic supporting means 50 with respect to the cylinder head 1. By elastically supporting the air duct 2, the support rigidity of the air duct 2 is ensured, and the transmission of the vibration of the cylinder head 1 to the air duct 2 is suppressed, and the vibration of the air duct 2 is effectively suppressed.

[Brief description of the drawings]

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

FIG. 2 is a side view of the engine.

FIG. 3 is a front view of the engine.

FIG. 4 is a plan view of the air duct.

FIG. 5 is a sectional view of the second elastic support means.

FIG. 6 is a plan view of the first elastic support means.

FIG. 7 is a sectional view of the gasket.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylinder head 2 Air duct 3 Intake manifold 10 Gasket with rubber 11 Core 12 Rubber 40 Coupling means 50 Second elastic support means 51 First bush 52 Second bush 53 Sleeve 54 Washer 55 Bolt 60 First elastic support means 64 Nut 65 Spring 67 stud bolt

Claims (3)

[Claims] 1. An air duct for guiding intake air across an upper portion of an engine body, an intake manifold for distributing intake air to each intake port of the engine body, and supporting the intake manifold on the engine body via an elastic material. An engine comprising: first elastic support means; coupling means for supporting the air duct on the intake manifold; and second elastic support means for supporting the air duct on the engine body via an elastic material. Air duct support structure. 2. The first elastic support means includes: a gasket with a rubber interposed between the intake manifold and the engine main body; and a spring for pressing the intake manifold against the engine main body. The engine air duct support structure according to claim 1. 3. A stay portion protruding from the air duct, a bush fitted into a hole of the stay portion, a sleeve inserted into the bush, and the sleeve attached to the engine body as the first elastic support means. The engine air duct support structure according to claim 1 or 2, further comprising: a bolt to be fastened.