JPH10266915A - Intake system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an intake system, in which the lowering of noise suppressing capacity of a silencer, which is caused by a gas that is sucked from a branch pipe, which is erected from a connecting pipe and which is connected to a carburetor via a idling speed control valve for idle-up in the power steering, is prevented. SOLUTION: An intake system is constituted of a pipe 20, which connects an air cleaner side and an engine side, a silenser 23, a connecting pipe 24, which connects the pipe 20 with a silenser 23 in such a manner that the gas can flow through them, and a branch pipe 25, which is provided/erected to/from the connecting pipe 24 in such a manner that the pipe 25 is capable of communicating with the connecting pipe 24. In this case, a partition wall 26, which distributes the gas into the branch pipe (25) side and into the silenser (23) side, is formed inside the connecting pipe 24.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an intake device. In detail, a pipe connecting the air cleaner side and the engine side, a muffler connected to the pipe via a connecting pipe, and an idle rotation control valve erected on the connecting pipe for power steering idle up. A branch pipe connected to the carburetor;
The present invention relates to an air intake device in which the performance of a silencer is prevented from being reduced due to the interference of gas passing through a branch pipe.

[0002]

2. Description of the Related Art FIG. 4 shows a conventional intake device.
(A) is a front view, (b) is an enlarged sectional view of a B part of (a). In FIG. 1, reference numeral 1 denotes a pipe for connecting the air cleaner to the engine side, and a muffler 4 is connected to the pipe 1 via a connecting pipe 5. A first branch pipe 2 and a second branch pipe 3 are erected on the pipe 1, and a third branch pipe 6 is erected on the connecting pipe 5.

[0003] This intake device is assembled to an engine as shown in FIG. That is, the pipe 1 has one end (bellows side) connected to the air cleaner 7 and the other end connected to the carburetor 9 side of the engine 8, and the first branch pipe 2 has a crankcase or a single body via a rubber hose or the like. Oil separator PVC (Positive Crankcase Ventilati)
on) Connected to valve 10.

The second branch pipe 3 is connected to the canister 11 via a rubber hose or the like.
Is connected to the carburetor 9 via an idle rotation control valve (ISCV) 12 for power steering idle up. The canister 11 is connected to the vaporizer 9 via a canister purge valve 13.

[0005] The silencer 4 is a resonance chamber,
The intake noise of the air taken into the engine from the air cleaner side can be reduced. The idle rotation control valve 12 for power steering idle-up connected with the third branch pipe 6 has a hydraulic pressure when the engine is idle when the steering wheel is turned off when the vehicle is stopped (so-called stationary steering) in the power steering of the vehicle. It does not go up, the effect of power steering is small,
Since the handle becomes heavy, air is supplied to the carburetor 9 so as to increase the rotation speed of the engine. This air is supplied from the third branch pipe 6 according to a signal from the engine control computer 14.

[0006] The PVC valve 10 of the oil separator to which the first branch pipe 2 is connected is sucked into the carburetor 9 for reburning the blow-by gas in the crankcase, so that the pressure in the crankcase becomes negative. Introduce fresh air to make up for this. The canister 11 is filled with activated carbon, adsorbs fuel gas evaporating in the fuel tank, and further discharges the fuel gas to the vaporizer 9 through the canister purge valve 13 to remove HC gas into the atmosphere. To prevent release.

[0007]

In the conventional intake system as described above, the carburetor is provided from the third branch pipe 6 erected on the connecting pipe 5 through an idle rotation control valve 12 for idling up the power steering. When the air is sucked into the pipe 9, the air between the pipe 1 and the muffler 4 is disturbed in the connecting pipe 5, so that there is a problem that the muffler 4 cannot mute the frequency to be muffled. Although the third branch pipe 6 can be provided at a location other than the connecting pipe 5, there is a case where the third branch pipe 6 cannot be provided at a location other than the connecting pipe due to an arrangement in the engine room.

SUMMARY OF THE INVENTION In view of the above-mentioned conventional problems, the present invention draws air from a branch pipe, which is erected on a connecting pipe and connected to a carburetor via an idle rotation control valve for power steering idle-up, toward the carburetor. It is an object of the present invention to realize an intake device in which the silencing ability of a silencer is prevented from being reduced due to the influence of air.

[0009]

In the intake device of the present invention, a pipe 2 for connecting an air cleaner side and an engine side is provided.
0, a muffler 23, a connecting pipe 24 for connecting the pipe 20 and the muffler 23 so that gas can flow therethrough,
Branch pipe 25 erected so as to communicate with the connecting pipe 24
And the connecting pipe 24
, A partition wall 26 for dividing gas into the branch pipe 25 and the silencer 23 is formed.

By adopting this configuration, the partition wall 26
Is separated into a space on the side of the branch pipe 25 and a space on the side of the muffler 23, so that the air between the pipe and the muffler is not interfered by the air passing through the third branch pipe, so that the capacity of the muffler is Reduction is prevented.

[0011]

1 and 2 show an embodiment of the present invention. FIG. 1 (a) is a front view, FIG. 1 (b) is a view taken in the direction of the arrow Z in FIG. 1 (a), 2A is an enlarged sectional view of a portion A in FIG. 1A, and FIG. 2B is a sectional view taken along line bb in FIG. 2A. In each figure, 20 is a pipe, 21 is a first branch pipe, 22 is a second branch pipe, 23 is a silencer,
24 is a connecting pipe, 25 is a third branch pipe, and 26 is a partition wall.

The pipe 20 has a bellows portion 20a formed of a soft resin such as an elastomer and a main body portion 20b formed of a hard resin such as a glass fiber-containing polypropylene.
Are integrally formed by blow molding. Also the first
The branch pipe 21 is erected substantially at the center of the pipe 20 so as to communicate with the pipe 20 by insert molding.
The second branch pipe 22 is formed by insert molding.
The main body 20b is erected near an end of the main body 20b so as to communicate with the main body 20b.

The silencer 23 has a flat box shape, and has an opening at one end. The opening is connected to a connecting pipe 24. The connecting pipe 24 has a tubular shape with both ends opened, one end of which is inserted into the pipe main body 20b, and the other end connected to the muffler 23 to connect the muffler 23 to the pipe main body 20b. A third branch pipe 25 is provided upright on the connecting pipe 24, and a partition wall 26 is provided over the entire length of the connecting pipe 24, and a space 27 on the third branch pipe side partitioned by the partition wall 26 is provided. The muffler side is closed by the muffler wall, and the pipe 20 side of the space 27 is open and communicates with the pipe 20. The partition wall 26 is formed integrally with the muffler in FIG. 2, but may be formed integrally with the connecting pipe 24 as shown in FIG.

When the present embodiment thus formed is used, similarly to the conventional example described with reference to FIG. 5, the end of the pipe 20 on the bellows portion 20a side is connected to the air cleaner 7, and the other pipe body is used. The end on the 20b side is connected to the carburetor 9 side of the engine. Further, the first branch pipe 21 is connected to a crankcase of the engine or a PVC valve 10 for forced ventilation of a crankcase provided alone via a rubber hose or the like. It is connected to the canister 11 via a rubber hose or the like.
Is connected to the carburetor 9 via an idle rotation control valve 12 for power steering idle-up.

During operation of the engine, the pipe 2
No. 0 supplies the air from which dust and the like have been removed by the air cleaner to the engine side. Further, the first branch pipe 21 is used to compensate for the negative pressure of the crankcase caused by sucking into the carburetor to reburn the blow-by gas of the engine, and
Fresh air is supplied to the crankcase via the C valve.

The second branch pipe 22 feeds the air cleaned by the canister 11 to the vaporizer 9. Further, when the power steering is stopped when the power steering is stopped (so-called stationary), the third branch pipe 25 has a low rotation speed when the engine is in an idling state and a shortage of hydraulic pressure for the power steering, thereby increasing the rotation speed of the engine. It serves to supply air to the carburetor 9 as much as possible.

The silencer 23 acts to reduce the intake noise of the air taken into the engine from the air cleaner. At this time, the partition wall 26 of the connecting pipe 24 is connected to the passage from the pipe 20 to the muffler 23 and the third
Is separated from the passage leading to the branch pipe 25, so that the third branch pipe 25 can be prevented from adversely affecting the muffler 23, and the performance of the muffler 23 can be prevented from lowering.

[0018]

According to the intake device of the present invention, a pipe connecting the air cleaner side and the engine side, a muffler, a connecting pipe connecting the pipe and the muffler, and an upright communication with the connecting pipe are provided. In the intake device including the branched branch hype, a partition wall for dividing gas into the branch pipe and the muffler is provided inside the connection pipe, so that the third branch pipe 25 adversely affects the muffler. , And a decrease in the performance of the silencer can be prevented.

[Brief description of the drawings]

FIGS. 1A and 1B are views showing an embodiment of the present invention, wherein FIG. 1A is a front view, and FIG.

FIG. 2 is an enlarged view of a portion A in FIG. 1A, wherein FIG.
(B) is sectional drawing in the bb line of (a) figure.

FIG. 3 is a diagram showing another example of the connection pipe according to the embodiment of the present invention.

FIG. 4 is a diagram showing a conventional intake device.

FIG. 5 is a diagram showing a usage state of a conventional intake device.

[Explanation of symbols]

 Reference Signs List 20 pipe 21 first branch pipe 22 second branch pipe 23 muffler 24 connecting pipe 25 third pipe 26 partition wall

Claims (1)

[Claims] 1. A pipe (20) connecting an air cleaner side and an engine side, a muffler (23), and a connecting pipe (24) connecting the pipe (20) and the muffler (23) so that gas can flow therethrough. ), And a branch pipe (25) erected in the connecting pipe (24) so as to be able to communicate with the connecting pipe (24). The branch pipe (25)
An intake device characterized in that a partition wall (26) for diverting the flow to a side and a muffler side (23) is formed.