JP2890775B2 - Silence structure of engine control valve - Google Patents

Description

Description: BACKGROUND OF THE INVENTION [0001] The present invention relates to a noise reduction structure for an engine control valve, and in particular, reduces the number of components by integrally forming a noise reduction wall with a surge tank. The present invention relates to a noise reduction structure for an engine control valve, which can simplify assembly, improve assembling workability, and be compact and advantageous in layout.

2. Description of the Related Art In an engine, the operating state of the engine is controlled by controlling the amount of air and the like by various engine control valves.

As an engine control valve, for example, there is an ISC valve (idle speed control valve) for controlling the amount of air to adjust the idling speed.

That is, as shown in FIG. 3, in the intake system of the engine, a throttle body 102 and a surge tank 104 provided with the throttle body 102 are provided.

On the other hand, the ISC valve 106 is operated electromagnetically to adjust the amount of bypass air to the engine, and has first and second valve ports 108 and 110. 1st valve port
The end of the first bypass pipe 112 has a first clamp 114.
Connected by In addition, the second valve port 11
0, one end of the second bypass pipe 116 is
Connected by

The other end of the second bypass pipe 116 is connected to the first
The third clamp 122 is connected to the port 120a. One end of a third bypass pipe 124 is connected to a second port 120b of the three-way pipe 120 by a fourth clamp 126. The other end of the third bypass pipe 124 is connected by a fifth clamp 130 to a tank-side port 128 provided on the side of the surge tank 104.

A third branch 120c for reducing the operation noise of the ISC valve 106 is provided at the third port 120c of the three-way pipe 120 with the sixth clamp 134.
Connected by

The second bypass pipe 116 and the side branch 132 are integrally held by a coupling clamp 136.

In order to reduce the operating noise of the ISC valve 106, as shown in FIG. 4, a volume type resonator 138 having a sound deadening chamber between the second bypass pipe 116 and the third bypass pipe 124 is separately provided. There are things. This resonator 138 is held by a mounting bracket 140, and mounting bolts 142-1, 142
-2 fixed.

Further, a method of controlling the idling speed by the ISC valve is disclosed in, for example, Japanese Patent Application Laid-Open No. 61-66836. The one described in this publication controls the amount of bypass intake air bypassing the throttle valve by the ISC valve, improves the effect of engine braking, such as providing the dashpot function to the ISC valve, or when the vehicle stops from deceleration. The purpose is to promptly perform feedback control of the engine speed to improve drivability.

[Problems to be Solved by the Invention] However, in the conventional silencing structure, since a side branch and a resonator are provided between the ISC valve and the surge tank, a plurality of bypass pipes and each bypass pipe are connected. Requires a large number of clamps, and in a structure provided with a resonator, it requires parts such as mounting brackets, so the number of parts increases, the structure becomes complicated, and the assembling work becomes difficult, Furthermore, because of the increase in size, there is also a limit on the mounting place, and improvement has been desired.

[Object of the Invention] Therefore, an object of the present invention is to eliminate the above-mentioned inconvenience, and it is necessary to separately install the sound deadening wall body by integrating the sound deadening wall body forming the sound deadening chamber with the surge tank. Another object of the present invention is to realize a noise reduction structure of an engine control valve which can reduce the number of parts, is not restricted by a mounting place, is compact, and is advantageous in layout.

Means for Solving the Problems In order to achieve this object, the present invention provides a sound deadening wall provided with a sound deadening chamber for reducing the operation sound of an engine control valve for controlling an operation state of an engine. In the muffler structure of the engine control valve, the muffler wall and the surge tank of the intake system are integrally formed via a partition wall so as to communicate the muffler chamber of the muffler wall and the tank chamber of the surge tank. A communication passage hole is formed in the partition, and a sound deadening wall side port portion connected to the engine control valve is provided in the sound deadening wall.

[Operation] According to the structure of the present invention, the operation noise generated by the operation of the engine control valve is formed integrally with the surge tank and is reduced by the noise reduction wall on the downstream side of the intake air from the engine control valve. Reduced in the room. This silencing wall is formed integrally with the surge tank, eliminating the need for a large number of connecting bypass pipes, connecting clamps, mounting brackets, and other components as in the past, thereby simplifying assembly work. Thus, the assembling workability is improved, and there is no limitation on the mounting place, the apparatus is compact, and the layout is advantageous.

Embodiment An embodiment of the present invention will be described below in detail and specifically with reference to the drawings.

1 and 2 show an embodiment of the present invention.
In the drawing, reference numeral 2 denotes an intake manifold provided to an engine (not shown), 4 denotes a surge tank provided at an upstream end of the intake manifold 2, 6 denotes a throttle body provided upstream of the surge tank 4, 8 Is an engine control valve, for example, an ISC valve (idle speed control valve).

The surge tank 4 is formed of, for example, an aluminum material by casting.

When the surge tank 4 is cast, a muffling wall 12 for reducing the operation noise of the ISC valve 8 is integrally formed on one side in the longitudinal direction with a partition 10 interposed therebetween.

As shown in FIG. 2, an intake passage hole 18 having a large passage cross-sectional area communicating between the inside of the throttle body 6 and the inside of the tank chamber 16 is formed in the other end wall 14 in the longitudinal direction of the surge tank 4.

In addition, a communication passage hole 20 having a small passage cross-sectional area is formed in the partition wall 10 so as to communicate the tank chamber 16 and the silencing chamber 18 formed by the silencing wall 12.

A tank-side port 22 is provided on the side of the surge tank 4.
Is provided. The tank inner portion 22a of the tank-side port portion 22 opens to a flow passage 26 formed by the partitioning body 24 in the tank chamber 16. Into this flow passage 26, intake air bypassing a throttle valve (not shown) in the throttle body 6 is introduced. One end of a first bypass pipe 28 is connected to the tank outer portion 22b of the tank side port portion 22 by a clamp (not shown).
The other end of the bypass pipe 28 is connected to a first valve port 30 on the upstream side of the ISC valve 8 by a clamp (not shown).

One end of a second bypass pipe 34 is connected to the second valve port 32 on the downstream side of the ISC valve 8 by a clamp (not shown), and the other end of the second bypass pipe 34 is
Outer side wall 36 of sound deadening wall side port part 36 provided on the side of 12
Connected to a.

The sound deadening chamber side port part 36b of the sound deadening wall side port part 36 is open to the sound deadening chamber 18. Therefore, the sound-absorbing-wall-side port portion 36 is
This is communicated to the ISC valve 8 via the second bypass pipe 34.

 Next, the operation of this embodiment will be described.

The intake air to the engine flows into the tank chamber 16 from the throttle body 6 side, and is supplied to the engine via the intake manifold 2.

Then, to adjust the idling speed, the ISC valve 8
Is operated, and when the intake air bypassing the throttle valve is guided into the surge tank 4 from the first and second bypass pipes 28 and 34, the ISC valve 8 generates a large operating noise.

However, this operating noise is reduced by the presence of the muffling chamber 18. That is, by reducing the pulsation caused by the operation of the ISC valve 8 in the muffling chamber 18, it is possible to reduce abnormal noise when the ISC valve 8 is operated.

Further, when a pressure hose through which pressure flows is provided in the sound deadening wall 12, even if the blow-by gas in the tank chamber 16 flows into the sound deadening chamber 18 through the communication passage hole 20 having a small passage cross-sectional area. The oil mist in the blow-by gas
And the oil mist flowing into the pressure hose side can be reduced.

Furthermore, since the surge tank 4 and the sound deadening wall 12 are integrally formed, the number of bypass pipes and connection clamps is reduced as compared with the conventional case, and components such as a mounting bracket for holding the resonator are not required. Thereby, the number of parts can be reduced, the configuration can be simplified, the assembling workability can be improved, and the cost can be reduced.

In addition, since the entire silencing structure is compact, there is no restriction on the mounting location, which is advantageous in layout.

[Effects of the Invention] As is apparent from the detailed description above, according to the present invention, the sound deadening wall and the surge tank of the intake system are integrally formed via the partition, and the sound deadening chamber of the sound deadening wall and the surge tank are formed. A communication passage hole is formed in the partition to communicate with the tank chamber of
By providing a sound-absorbing wall side port portion connected to the engine control valve on the sound-absorbing wall, there is no need to install the sound-absorbing wall separately, reducing the number of parts, simplifying the configuration, and There is no restriction on the installation location and it is compact.
This can be advantageous in layout.

[Brief description of the drawings]

1 and 2 show an embodiment of the present invention. FIG. 1 is a perspective view of a muffling structure of an engine control valve, and FIG. 2 is a sectional view of a muffling structure of an engine control valve. FIGS. 3 and 4 show a silencing structure of a conventional engine control valve, FIG. 3 is a block diagram of a silencing structure provided with a side branch, and FIG. 4 is a block diagram of a silencing structure provided with a resonator. In the figure, 2 is an intake manifold, 4 is a surge tank,
8 is an ISC valve, 10 is a partition wall, 12 is a sound deadening wall body, 16 is a tank room, 1
8 is a sound deadening room, and 20 is a communication hole.

Claims (1)

(57) [Claims] 1. A noise reduction structure of an engine control valve provided with a noise reduction wall formed with a noise reduction chamber for reducing an operation noise of an engine control valve for controlling an operation state of an engine. The body and the surge tank of the intake system are integrally formed, and a communication passage hole is formed in the partition so as to communicate the silencing chamber of the silencing wall with the tank chamber of the surge tank. A silencing wall side port portion connected to the engine control valve.