JPS5823949Y2 - Engine with soundproof cover - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a low noise type engine in which the entire engine body is surrounded by a sound insulating cover.

This type of engine is extremely quiet because the noise generated by the engine can be shut off by a sound insulating cover, and it contributes fully to the improvement of noise pollution, which has become a problem in recent years.

Such a low-noise engine generates only a small amount of exhaust noise, intake noise, rotation noise (operation noise) of auxiliary equipment, etc.

Various improvements have been studied and implemented to reduce these sounds.

In other words, we improved the muffler to reduce exhaust noise, connected the intake duct to the air intake of the air cleaner to reduce intake noise, and increased the capacity of auxiliary equipment to reduce the operating noise of auxiliary equipment. Various improvements have been made, such as lowering the rotational speed.

However, when an intake duct is provided, the external size of the engine becomes large.For example, in an engine installed in a car, it is difficult to install an intake duct of the necessary length due to the engine lumen.

In addition, if a sound insulating cover is installed, the engine body, which is the heat source, is thermally isolated from the engine room, and the temperature of the engine room decreases, so in winter when the outside temperature is low, the intake air temperature becomes too low and the fuel is drained. Providing a sound insulating cover sometimes worsened engine drivability (combustion conditions), such as worsening vaporization.

This idea was made in view of the above-mentioned circumstances, and the interior of the sound insulating cover is normally used as an intake duct to reduce intake noise.

The intake action of the engine allows the air to flow inside the sound insulation cover to cool the inside, while at the same time, when the outside temperature is high such as in the summer, outside air is taken in from the engine room where the temperature is low to prevent a drop in intake efficiency. The aim is to provide an engine that can do this.

The invention will be described in detail below with reference to one embodiment shown in the drawing.

In the figure, reference numeral 1 denotes a fuel injection water-cooled engine body, and the entire engine body 1 is covered with a sound insulating cover 2.

An air intake port 3 is provided at the front end of the sound insulation cover 20, an air exhaust port 4 is provided at the rear end of the sound insulation cover 20, and an engine body 1 is provided on the top surface of the sound insulation cover 2.
Inspection.

An inspection lid 5 for maintenance etc. is attached as necessary.

In addition, by pasting a sound absorbing material 6 on the entire inner surface of the sound insulation cover 2, the sound insulation effect of the sound insulation cover 2 is doubled, and the intake pipe 7 and exhaust pipe 8 attached to the engine body 1 are
and are each led out to the outside of the sound insulating cover 2.

9 and 10 suck. This is an elastic sealing material that closes off the portions through which the exhaust pipes 7 and 80 pass, and these sealing materials 9 and 10 and the sound absorbing material 6 are made of a material with high heat resistance.

Then, the air intake port of the intake pipe 7 led out to the outside of the sound insulation cover 2 as described above is connected to the outlet of the air cleaner 11 installed outside the sound insulation cover 2, and the air cleaner 1
By connecting the air inlet 1 to the air outlet 4 provided on the cover 2 and providing a switching valve 14 to the air outlet 4, the air can be switched between the air cleaner 11 flowing out from the air outlet 4 and the outside air. I'm trying to guide you.

In addition, an internal cooling fan 13 is removably installed inside the sound insulation cover 2, and an outside air intake port 1 equipped with an on-off valve 15 is provided.
6 is provided in the air cleaner 11.

The exhaust pipe 8 is opened to the outside air via a muffler (not shown) or the like.

12 is a strainer stretched over the air intake port 3 of the sound insulating cover 2.

In the above structure e:, VC, the switching valve 14 is used in winter and at all times.
Since the on-off valve 15 is maintained in the state shown by the solid line in the figure, the intake pipe 7 of the engine body 1 is communicated with the air outlet 4 of the sound insulating cover 2 via the air cleaner 11.

For this reason, when the engine is operated, air within the sound insulating cover 2 is drawn into the combustion chamber via the air cleaner 11.

Then, since the inside of the sound insulating cover 2 becomes negative pressure, outside air flows into the cover 2 through the air intake port 3.

Here, the intake air flow rate of the engine increases approximately in proportion to the increase in rotational speed, or when the engine is a gasoline engine or the like, the intake air flow rate increases as the load increases.

For this reason, as the engine speed or load increases and the amount of heat generated increases, a larger amount of outside air flows into the sound insulation cover 2, so when the outside temperature is low, such as in winter, the internal cooling fan 13 is turned off. Even without it, overheating inside the cover 2 is prevented.

In addition, since the air whose temperature has increased inside the sound insulation cover 2 flows into the air cleaner 11, the air cleaner 11 is closed even during snowy seasons.
Air cleaner 1 as there is no risk of snow being sucked into the interior.
The freezing accident and lack of fuel vaporization described in 1 can be prevented, and the sound insulating cover 2 also attenuates intake noise.

On the other hand, when the outside temperature is high, such as during the summer.

An internal cooling fan 13 is attached to increase the amount of ventilation (cooling capacity) inside the sound insulating cover 2, and the switching valve 14 and the on-off valve 15 are switched as shown by chain lines in the figure.

Then, the air exhaust port 4 of the sound insulation cover 2 and the outside air intake port 16 of the air cleaner 11 are both opened to the outside air, so the air whose temperature has increased inside the sound insulation cover 2 (high temperature air) is discharged to the outside air, and the air cleaner 11 has a temperature Outside air with a low temperature is introduced.

For this reason, the engine can be operated with the desired intake efficiency even when the outside temperature is high, such as during the summer.

In the embodiment, the internal cooling fan is rotationally driven by the engine, but the internal cooling fan may be configured with an electric fan, or an electromagnetic clutch or the like may be interposed in the fan drive system to control the temperature inside the sound insulation cover. The cooling capacity inside the cover may be automatically increased by driving the internal cooling fan once only when the internal cooling fan reaches a predetermined value or more. Alternatively, the switching valve and the on-off valve may be switched and operated in synchronization with the driving of the internal cooling fan.

As detailed above, in this invention, a sound insulating cover that surrounds the entire engine body is used as a passage for reducing intake noise and a passage for heating intake air. Since the center of the intake air can be heated manually or automatically when the sound insulation cover is high), the operating performance of the engine equipped with this type of sound insulation cover can be improved.

[Brief explanation of the drawing]

The figure is a longitudinal sectional view of the main parts of an embodiment of this invention. 1... Engine body, 2... Sound insulation cover, 3... Air intake port, 4... Air exhaust port, 6... Sound absorption Material, 7...Intake pipe,
11...Air cleaner, 14...Switching valve, 15...Opening/closing valve, 16...Outside air intake.

Claims (1)

[Scope of utility model registration request] An air inlet is provided at one end of the sound insulating cover that surrounds the entire engine body, and a switching valve is provided to switch and connect the air outlet provided at the other end of the cover to the air cleaner inlet and the outside air. An engine equipped with a sound insulation cover, characterized in that an air cleaner is provided with an outside air intake port equipped with a valve, and a sound absorbing material is pasted on at least the inner surface of the air intake port of the sound insulation cover.