JP2002221108A - Structure of intake system for engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure the capacity of a resonator by deforming the resonator, secure an installation space for a canister, and protect a detecting part and the canister. SOLUTION: In this structure of an intake system for an engine, an air cleaner is mounted on a cylinder head cover in the upper part of the engine, an intake duct is connected to the air cleaner, and a resonator is provided on the intake duct. The intake duct and the resonator are integrally molded, and the resonator is formed into a rectangle. The resonator is disposed on the side of the air cleaner and the engine, and has a recessed part on the lower side of an inlet pipe part to make the resonator communicate with the air cleaner. A detecting part provided on the side of the engine is covered with the recessed part, and the canister is disposed on the backside of the resonator.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the structure of an intake system of an engine, and more particularly, to an engine for deforming a resonator to secure the capacity of the resonator, securing an installation space for a canister, and protecting a detection unit and a canister. It relates to the intake system structure.

[0002]

2. Description of the Related Art In an engine mounted on a vehicle,
There is a type in which an air cleaner or a resonator is provided in an intake system for supplying intake air to the engine.

As an intake system structure of the engine, there is one disclosed in Japanese Patent Application Laid-Open No. 1996-21242.
In the engine cooling pipe structure disclosed in this publication, a crank angle sensor and an engine cooling water outlet cap are provided at a rear end portion of the engine, and the engine cooling water outlet cap and the engine cooling water flow pipe are arranged in the traveling direction of the vehicle. On the other hand, a crank angle sensor is provided so as to surround the engine, an engine cooling water flow pipe extends between the crank angle sensor and an exhaust manifold attached to the engine, and the crank angle sensor is protected by a cooling pipe.

[0004] Also, there is one disclosed in JP-A-1997-112365. The intake device for an internal combustion engine disclosed in this publication includes an air cleaner designated in an engine room, an air cleaner intake hose connecting the air cleaner to the internal combustion engine and having a branch opening on a side surface of the air cleaner, and an air cleaner in the vicinity of the air cleaner. And a resonator that is juxtaposed to the side of the air cleaner intake hose and connected to the branch opening, allowing the resonator to be installed regardless of the presence of accessories in the engine room, and simplifying its capacity and support structure. ing.

[0005] Further, there is one disclosed in Japanese Utility Model Laid-Open Publication No. 1993-36062. The engine intake device disclosed in this publication extends the ends of the crankshaft and the camshaft from the end wall of the engine body to the outside, stretches a belt between these ends via a pulley, In an intake device for an engine in which a belt cover for covering a belt is disposed on an engine body, a part of an inlet pipe and a resonator are integrally formed on the belt cover to facilitate piping work in the intake device for the engine.

[0006]

By the way, in the conventional intake system structure of the engine, the air cleaner inlet hose connected to the air cleaner and the resonator are formed separately, and the air cleaner inlet hose and the resonator are connected to another rubber hose. Was connected.

[0007] At this time, the use of the above-described rubber hose for connection increases the number of assembly steps in a factory, is disadvantageous in practical use, increases the number of parts, increases the cost, and is economical. There is a disadvantage that it is disadvantageous.

Further, since the resonator is fixed in the fender above the tire house of the vehicle body, it is inconvenient that it is difficult to secure a capacity necessary for maintaining engine performance.

[0009]

Therefore, in order to eliminate the above-mentioned disadvantages, the present invention mounts an air cleaner on a cylinder head cover above an engine, connects an intake duct to the air cleaner, and attaches a resonator to the intake duct. In the provided intake system structure of the engine, the intake duct and the resonator are integrally formed, and the resonator is formed in a rectangular shape. A recessed portion below the inlet pipe portion communicating with the engine, the recessed portion covers a detecting portion provided on the side of the engine, and a canister is arranged on the back side of the resonator.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION
A rectangular resonator with a concave part on the engine side ensures the capacity of the resonator while avoiding the detection part on the side of the engine, and also allows the installation space of the canister to appear on the back of the resonator, and has a rectangular shape. The resonator protects the detector from above and from the side, and protects the canister from the front.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

1 to 11 show an embodiment of the present invention. In FIG. 1, 2 is an engine, 4 is a cylinder head, 6 is a cylinder head cover, and 8 is an air cleaner.

The engine 2 is provided on a cylinder block (not shown), a cylinder head 4 mounted on the upper surface of the cylinder block, a cylinder head cover 6 mounted on the upper surface of the cylinder head 4, and a lower portion of the cylinder block. And an oil pan.

An air cleaner 8 is mounted on the cylinder head cover 6 above the engine 2, and an air intake duct 10 is connected to the air cleaner 8.

At this time, a resonator (which can be referred to as an “intake silencer”) 12 is integrally formed with the intake duct 10.

The intake system of the engine 2 includes an intake duct 1
The air cleaner 8 has an intake port 14 at an upstream end thereof, and a downstream end of the intake duct 10 is connected to the air cleaner 8. A throttle body 18 is provided downstream of the air cleaner 8 via an outlet pipe 16. It is connected and provided in communication with the intake manifold 20. At this time, the throttle body 18 is provided at a central portion of a surge tank (not shown) of the intake manifold 20 and a forward portion of the vehicle.

A resonator 12 integrally formed with the intake duct 10 is formed in a rectangular shape.
2 is disposed on the side of the air cleaner 8 and the engine 2, and the resonator 12 and the air cleaner 8
Pipe section 22 of the intake duct 10 that communicates with the
Has a concave portion 24 below, and the concave portion 24 covers a detecting portion provided on the side of the engine 2, for example, a crank angle sensor 26, and a canister 28 is provided on the back side of the resonator 12. .

More specifically, the intake duct 10 is configured as shown in FIG.
As shown in FIG. 5, the intake pipe section 30 is formed integrally with the inlet pipe section 22 and the resonator 12, and an air introduction section 32 connecting the resonator 12 and the intake port 14. Are arranged diagonally.

At this time, in FIG. 2 and FIG.
Indicates the vehicle width direction, arrow Y indicates the front-back direction of the vehicle, arrow Z indicates the up-down direction, and the intake pipe section 30 is disposed so as to be directed obliquely forward of the vehicle.

Further, as shown in FIG. 4, the inlet pipe portion 22 is formed in an elliptical shape elongated in the lateral direction.

Further, the resonator 12 is connected to each of FIGS.
As shown in FIG. 1, the inside of the resonator 12 is divided into a first low-frequency chamber 34 and a second high-frequency chamber 36, and the interior of the resonator 12 is formed by the first low-frequency chamber 34 and the intake pipe 30. First
The communication part 38 and the second communication part 40 of the second high-frequency chamber 36 and the intake pipe part 30 are arranged to be vertically different.

At this time, in the outer peripheral portion of the resonator 12, the low-frequency first chamber 34 is located on the side of the intake pipe 30.
As shown in FIG. 10, a concave relief portion 42 is formed.

Then, the air cleaner 8 and the resonator 12 are fixed to the engine 2 through a first bracket 44 which is a bracket attached to the intake manifold mounting flange 20f of the intake manifold 20. A first mounting boss 45-1 and a second mounting boss 45-2 are provided above the intake manifold mounting flange 20f, and the first mounting boss 45-1 on the engine 2 side is the second mounting boss 45-1 on the resonator 12 side.
It is formed above the mounting boss 45-2.

That is, the air cleaner 8 is fixed at two places. The first place is fixed to the cylinder head cover 6 via the connecting arm 46 by the mounting bolt 48, and the second place is the air cleaner. 8 is fixed to the first bracket 44 by an attachment bolt 50 via an air cleaner attachment portion 49 provided on the resonator 12 side. The first mounting bracket 44 is formed in an L shape, and has mounting bolts 50-1 and 50-2 for the intake manifold mounting flange 20f, a mounting bolt 56-1 for the air cleaner 8, and a mounting bolt 56-2 for the resonator 12. Mounting holes 50a-1, 50a-2 and 56a-
1, intake manifold mounting flange 2 having 56a-2
Horizontal portion 44-1 having mounting holes 50a-1 and 50a-2 into which mounting bolts 50-1 and 50-2 for 0f are inserted.
Mounting holes 56a- into which mounting bolts 56-1 for the air cleaner 8 and mounting bolts 56-2 for the resonator are inserted.
1, a vertical wall portion 44-2 including a vertical wall portion 44-2 having a vertical portion 44a and a vertical wall portion 44-2 extending in a vertical direction via a bent portion 44-3. Is formed. The vertical wall portion 44-2 has an air cleaner mounting portion 49 mounted on the upper surface of the cylinder head cover 6 and a first of an intake manifold mounting flange 20f of the cylinder head 4 and
The second mounting bosses 45-1 and 45-2 extend in the up-down direction so as to be connected thereto.

The resonator 12 is also fixed at two places. That is, the first place is to connect the connecting leg 12-2 formed on the main body 12-1 of the resonator 12 in which the inlet pipe 22 is integrally formed with the mounting bolt 5
4 to the second bracket 52, the second place,
Like the air cleaner 8, a resonator mounting portion 12-4 formed on a lid portion 12-3 that covers the main body portion 12-1.
Is fixed to the first bracket 44 by the mounting bolt 50.

The first bracket 44 is attached to the cylinder head 4 together with the intake manifold 20 by the head mounting bolts 5.
6 and the second bracket 52 is fixed to the cylinder head 4 with a head mounting bolt 58.

For this reason, the resonator 12 has a structure that can be attached to the engine 2.

Reference numeral 60 denotes an air cleaner inlet pipe connected to the upstream end of the intake duct 10, and 62 denotes the inside of the resonator 12 as a first low-frequency chamber 34 and a second high-frequency chamber 36. It is a partition wall for partitioning.

Next, the operation will be described.

When the air cleaner 8 is mounted on the engine 2, the air cleaner 8 is fixed to the cylinder head cover 6 via the connecting arm 46 by mounting bolts 48, and is also fixed to the first bracket 44 by mounting bolts 50.
The air cleaner 8 is fixed at two places, and the air cleaner 8 is mounted on the cylinder head cover 6 above the engine 2.

When attaching the vertically formed resonator 12, similarly to the air cleaner 8, the resonator 12 is fixed to the first bracket 44 by a mounting bolt 50, and is fixed to the second bracket 52 by a mounting bolt 54. The resonator 12 is fixed at two places, is disposed on the side of the air cleaner 8 and the engine 2, and the resonator 12 is attached to the engine 2.

Thus, the vertical wall portion 44 extending vertically.
The air cleaner 8 disposed on the upper surface of the cylinder head cover 6 and the resonator 12 disposed on the side of the air cleaner 8 can be mounted on the intake manifold mounting flange 20f mounted on the cylinder head 4 by the first bracket 44 having -2. In addition, the rectangular shape of the resonator 12 having the concave portion 24 on the engine 2 side can secure the capacity of the resonator 12 while avoiding the detection unit such as the crank angle sensor 26 on the side of the engine 2. The installation space for the canister 28 can be exposed on the back of the resonator 12, which is practically advantageous.

The vertically long resonator 12 protects the detection unit, for example, the crank angle sensor 26 from above and from the side.
Can be protected from the front, and the crank angle sensor 26
And the canister 28 can be prevented from being damaged or deformed as much as possible, and the service life of the crank angle sensor 26 and the canister 28 can be extended.

Further, the intake duct 10 is constituted by an intake pipe part 30 in which the inlet pipe part 22 and the resonator 12 are integrally formed, and an air introduction part 32 connecting the resonator 12 and the intake port 14, By arranging the intake pipe section 30 obliquely, the length of the intake duct 10 in the resonator 12 can be sufficiently ensured, and when the intake duct 10 in the resonator 12 and the resonator 12 are integrally formed. , A wide surface area can be secured.

Further, the inlet pipe portion 22
Is formed in an elliptical shape elongated in the horizontal direction,
It is possible to suppress the height of the inlet pipe portion 22 connected to the air cleaner 8 while securing a necessary cross-sectional area,
The height of the air cleaner 8 can be reduced, which is practically advantageous.

The resonator 12 is divided into a first low-frequency chamber 34 and a second high-frequency chamber 36, and a first communication section 38 between the low-frequency first chamber 34 and the intake pipe 30. When,
The distance between the first communication part 38 and the second communication part 40 is increased by disposing the second communication part 40 for the high frequency and the second communication part 40 of the intake pipe part 30 vertically different from each other. This facilitates formation of the partition wall 62 provided between the first communication portion 38 and the second communication portion 40.

Further, the air cleaner 8 and the resonator 12 are fixed to the engine 2 via a first bracket 44 which is a bracket attached to an intake manifold mounting flange (not shown) of the intake manifold 20, so that the air cleaner 8 and the resonator 12 are fixed. The engine 2 is connected to the resonator 12 by the first bracket 44 which is one bracket.
, And the resonator 12 and the air cleaner 8 can be vibrated integrally with the engine 2, thereby eliminating problems such as noise and deterioration of the mounting state caused by different vibrations.

It should be noted that the present invention is not limited to the above-described embodiment, and various application modifications are possible.

For example, in the embodiment of the present invention, a notch-shaped concave portion 24 is formed below the inlet pipe portion 22 of the intake duct 10 that communicates the resonator 12 and the air cleaner 8 integrally formed with the intake duct 10. Although the configuration is formed, a special configuration in which the hole-shaped concave portion 72 is formed is also possible.

That is, as shown in FIG. 12, a hole-shaped concave portion 72 is formed in the resonator 12 so as to conform to the outer peripheral shape of the crank angle sensor.

By locating the end of the crank angle sensor in the hole-shaped concave portion 72 formed in the resonator 12, the entire circumference of the crank angle sensor can be protected. Deformation can be prevented as much as possible, and the capacity of the resonator can be secured, which is practically advantageous.

It is also possible to provide a special structure in which an arm 82 projecting toward the canister 28 is provided on the back surface of the resonator 12.

That is, as shown in FIG. 13, an arm 82 projecting horizontally, for example, is provided integrally on the back and lower part of the resonator 12, as shown in FIG.

Then, the arm portion 82 can function as a canister mount or a canister mounting bracket, and the number of parts can be reduced, mounting workability can be improved, and usability can be improved. Things.

[0045]

As described above in detail, according to the present invention, the air cleaner is mounted on the cylinder head cover at the upper part of the engine, and the air cleaner is connected to the intake duct.
In the intake system structure of an engine that has a resonator in the intake duct, the intake duct and the resonator are integrally formed, the resonator is formed in a rectangular shape, and the resonator is disposed on the side of the air cleaner and the engine. Has a recess on the lower side of the inlet pipe section that communicates with it, and covers the detection section provided on the side of the engine with the recess, and the canister is arranged on the back side of the resonator, so it has a rectangular shape with a recess on the engine side With the formed resonator, the capacity of the resonator can be ensured while avoiding the detection unit on the side of the engine, and the installation space for the canister can be made to appear on the back of the resonator, which is practically advantageous. In addition, a rectangular resonator can protect the detector from above and from the side, and can protect the canister from the front, preventing the detector and the canister from being damaged or deformed as much as possible. Thus, the service life of the detection unit and the canister can be extended.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing an embodiment of the present invention in a state where an intake system of an engine is mounted.

FIG. 2 is a plan view of an intake duct and a resonator.

FIG. 3 is a front view of an intake duct and a resonator.

FIG. 4 is a left side view of an intake duct and a resonator.

FIG. 5 is a right side view of an intake duct and a resonator.

FIG. 6 is a schematic bottom view of only a resonator.

FIG. 7 is a schematic partially cutaway rear view of only a resonator.

FIG. 8 is a sectional view taken along line 8-8 in FIG. 5;

FIG. 9 is a sectional view taken along line 9-9 in FIG. 5;

FIG. 10 is a sectional view taken along line 10-10 in FIG. 2;

FIG. 11 is a sectional view taken along line 11-11 of FIG. 2;

FIG. 12 is a left side view of an intake duct and a resonator showing another first embodiment of the present invention.

FIG. 13 is a right side view of an intake duct and a resonator showing another second embodiment of the present invention.

[Explanation of symbols]

 2 Engine 4 Cylinder head 6 Cylinder head cover 8 Air cleaner 10 Intake duct 12 Resonator 14 Intake port 16 Outlet pipe section 18 Throttle body 20 Intake manifold 22 Inlet pipe section 24 Concave 26 Crank angle sensor 28 Canister 34 Low frequency first chamber 36 High frequency Second chamber 42 Escape 44 First bracket 46 Connecting arm 52 Second bracket 60 Air cleaner inlet pipe

Claims (5)

[Claims] An air cleaner is mounted on a cylinder head cover at an upper part of an engine, an intake duct is connected to the air cleaner, and a resonator is provided in the intake duct. In the intake system structure of an engine, the intake duct and the resonator are integrally formed. The resonator is formed in a rectangular shape, and the resonator is disposed on a side of the air cleaner and the engine, and has a concave portion below an inlet pipe portion that communicates the resonator with the air cleaner. An intake system structure for an engine, wherein a canister is arranged on a rear side of the resonator, covering a detection unit provided on a side of the engine. 2. The intake duct comprises an intake pipe section in which the inlet pipe section and the resonator are integrally formed, and an air introduction section connecting the resonator and the intake port, and the intake pipe section is inclined. 2. An arrangement as claimed in claim 1, wherein:
The intake system structure of the engine described in the above. 3. The intake system structure for an engine according to claim 1, wherein said inlet pipe portion is formed in an elliptical shape elongated in a lateral direction. 4. The resonator is partitioned into a first low-frequency chamber and a second high-frequency chamber, and a first communication portion between the low-frequency first chamber and the intake pipe section; 3. An intake system structure for an engine according to claim 1, wherein a chamber and a second communication portion between the intake pipe portion and the second communication portion are vertically arranged differently. 5. The intake system structure for an engine according to claim 1, wherein the air cleaner and the resonator are fixed to the engine via a bracket attached to an intake manifold attachment flange.