JPH064041Y2 - Intake silencer for soundproof engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention relates to a so-called soundproof engine in which the entire engine is covered with a soundproof case, and more particularly, to a structure for muffling its intake air.

2. Description of the Related Art In an engine generator or the like in which an engine and a generator are integrated, the engine and the generator are covered by a soundproof case to prevent noise from leaking to the outside. FIG. 4 shows a conventional structure of such a soundproof engine generator. In the figure, (1) is an engine, (2) is a generator driven by the engine (1), and both the engine (1) and the generator (2) are mounted on a mount (3). , A box-shaped soundproof case (4)
Is covered by. (5) is an air cleaner for the engine (1), which is directly attached to the intake port of the cylinder head (6) and has an intake pipe (7) for taking in air. It extends toward the intake duct (8) formed on the side wall of the soundproof case (4).

Further, in such a soundproof engine, in order to effectively reduce the intake sound, conventionally, an intake muffling chamber is formed on the side wall of the soundproof case (4), and the intake port side of the engine is provided through the intake muffling chamber. There is one in which intake air is taken in (see Japanese Utility Model Laid-Open No. 62-21448).

Problems to be Solved by the Invention In the conventional structure shown in FIG. 4, the air cleaner (5) is arranged in the soundproof case (4), and intake of intake air by the suction pipe (7) is performed in the soundproof case (4). Although it is carried out in the interior to prevent the intake sound from being transmitted inside, there is a drawback that such a structure does not necessarily provide a sufficient noise reduction effect. Further, in the case where the sound deadening chamber is formed in the soundproof case, although the intake sound can be reduced to some extent, there is a drawback that the entire case becomes large.

The present invention solves the above-mentioned drawbacks of the related art and provides a sound deadening device for a soundproof engine that can reduce intake noise without increasing the size of the soundproof case.

Means for Solving the Problems And, in order to achieve the above-mentioned object, in the present invention, the whole engine installed on the pedestal is covered with a soundproof case, and an intake silencer is installed in the pedestal. The feature is that the outlet of the silencer and the intake part of the engine are connected by an intake pipe.

Operation According to the configuration of the above invention, since the intake silencer is provided in the pedestal portion, it is not necessary to upsize the soundproof case, and the intake silencer can reduce intake noise and reduce noise. You can get the engine.

Embodiment Hereinafter, the structure of the present invention will be described based on an illustrated embodiment. In FIGS. 1 and 2, (11) is an engine, and (1)
2) is a generator driven by this engine (11), and as in the conventional case, this engine (11) and generator (12)
It is mounted and mounted on the frame (13), and these are covered by a box-shaped soundproof case (14). As shown in FIG. 2, a frame (26) made of a pair of left and right channel steels of the pedestal (13).
The intake silencer (15) of the present invention is installed between (26), and the intake silencer (15) also forms a part of the pedestal (13). A pair of upper and lower plates (16) (16) Is covered by. (17) is an air cleaner, and the suction pipe (18) connected to the suction side of the air cleaner (17) is a soundproof case.
It extends toward the side of the intake duct (19) formed on the side wall of (14), so that the intake air is sucked into the soundproof case (14) near the intake duct (19). The outlet side of the air cleaner (17) is connected to the intake port of the intake silencer (15) via the hose (20). As shown in FIG. 2, an intake inertia pipe (21) is arranged on the opposite side of the hose (20) across the engine (11), and the lower end of the intake inertia pipe (21) is It is connected to the outlet side of the intake silencer (15), extends upward in a substantially curved shape from this connecting portion, and is then connected to the intake port of the cylinder head (22) of the engine (11). In the figure, (23) is the fuel tank, (24)
Indicates an exhaust silencer. In addition, as shown in FIG. 3, the intake silencer (15) is provided with anti-vibration rubber (25) on both upper and lower surfaces thereof.
Is attached, and is interposed between the upper and lower plates (16) and (16) via the anti-vibration rubbers (25) and (25).

Effect of the Invention According to the present invention, as described above, the intake silencer is installed in the frame on which the engine is mounted, and therefore, unlike the conventional one in which the intake silencer is formed on the side wall of the soundproof case, There is an effect that the intake noise can be reduced without increasing the size of the entire soundproof case, and a noise reduction effect of about 8 dB can be obtained as compared with the case of FIG.
Moreover, in this invention, since the intake silencer is arranged in the cradle, which is a low temperature part under the engine, even when air in the soundproof case is taken in,
Cooling can be effectively performed in this low-temperature portion, intake charging efficiency can be improved, and output performance can be increased. Further, the intake pipe connecting the pedestal below the engine and the cylinder head on the intake side above the engine can be of a sufficient length, which can provide an intake inertia effect,
The intake inertia effect can be further improved. The intake inertia effect is determined by the length and diameter of the intake pipe. In this case, it is possible to bend the intake pipe in a soundproof case to increase the length. There is a disadvantage that the road resistance increases and the efficiency deteriorates. On the other hand, as in the invention of the present application, by providing the engine over the lower side to the upper side, a sufficient length can be obtained without causing such a line resistance. Can be an intake inertia tube. Further, since it is provided on the pedestal portion as described above, it is possible to form a sound deadening chamber of a sufficient size, and even in that case, the soundproof case is not increased in size.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view of the entire soundproof case showing an embodiment of the present invention, FIG. 2 is a vertical sectional side view of the same, and FIG. 3 is a schematic view showing an arrangement structure of an intake silencer, an air cleaner and an intake pipe. FIG. 4 is a vertical sectional front view of a conventional soundproof engine. (11) ... Engine, (13) ... Stand, (14) ... Soundproof case, (15) ... Intake silencer, (21) ... Intake (inertial) pipe.

Claims (1)

[Scope of utility model registration request] 1. A soundproof case covering the entire engine installed on a pedestal, and an intake silencer is installed in the pedestal, and the outlet of the intake silencer and the intake port of the engine are connected by an intake pipe. An air intake silencer for a soundproof engine.