JPS6242114Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is an internal combustion engine equipped with a supercharger such as an exhaust turbo supercharger or a mechanical supercharger in the intake system of the engine. The present invention relates to an intake device equipped with a surge tank.

Modern internal combustion engines are equipped with superchargers such as exhaust turbo superchargers to improve output and reduce fuel consumption, but the supercharged air compressed by the supercharger is Since there is high-frequency pulsation that occurs during compression in the feeder, guiding this to the engine through the carburetor downstream will adversely affect the fuel supply in the carburetor, and the intake air-fuel mixture will be affected. The air-fuel ratio fluctuates, and high-frequency pulsations and pulsations caused by the opening and closing of the engine's intake valve resonate in a specific rotation range, resulting in a reduction in engine filling efficiency.

Therefore, Japanese Utility Model Application Publication No. 50-27214 as a prior art proposes to provide a surge tank for eliminating pulsation between the carburetor and the supercharger upstream thereof, and to purify the intake air in this surge tank. However, since the atmospheric air containing dust and dirt passes through the turbocharger as it is, this reduces the durability of the turbocharger due to dust and dirt. This is not a good idea as it will drop significantly, and an air cleaner is required on the suction side of the supercharger. In addition, in this type of supercharged internal combustion engine,
In order to prevent overcharging when the engine decelerates, or to control the boost pressure so that it does not exceed a certain value, the downstream boost pressure is installed between the upstream and downstream sides of the turbocharger. If it exceeds a certain value, a blow-off valve must be installed to release some of the supercharged air upstream.

However, in this way, the air cleaner,
Providing the three separate surge tanks and blow-off valves significantly increases the installation space and weight, and since the surge tanks in the prior art are exposed to the atmosphere, it is difficult to eliminate pulsations in the surge tanks. The noise generated during this process is directly transmitted to the atmosphere, and furthermore, when the blow-off valve controls the supercharging pressure, the noise generated when the supercharged air is released is transmitted to the atmosphere, and the combined noise is quite large. So it was hot.

This invention has three components, an air cleaner, a surge tank, and a blow-off valve, in the intake system of a supercharged internal combustion engine.
In the case where the surge tank is provided in the cleaner case of the air cleaner, and the blow-off valve is provided in the surge tank, the installation space is reduced and the weight is reduced, and pulsation in the surge tank is eliminated. This also reduces the transmission of noise generated during boost pressure control to the atmosphere.

The present invention will be explained below with reference to the drawings of the embodiments. In the drawings, 1 indicates an intake manifold 2 on one side.
4 is an exhaust turbo supercharger directly connected to an exhaust turbine 5 and a blower compressor 6, and 7 is a carburetor with a throttle valve 8 attached to the intake manifold 2. The exhaust manifold 3 is an exhaust passage 9.
An exhaust pipe 10 is connected to the inlet side of the exhaust turbine 5 through the exhaust turbine 5, and an exhaust pipe 10 is connected to the outlet side of the exhaust turbine 5 for discharging exhaust gas to the atmosphere.

Reference numeral 11 indicates an air cleaner attached to the upper surface of the carburetor 7, and the air cleaner 11 is shown in FIGS.
As shown in the figure, there is a cylindrical cleaner case 12 with a bottom plate 13 that is open at the top, a lid 14 that can be opened and closed to close the upper opening of the cleaner case 12, and a plurality of bolts 16 attached to the lower surface of the cleaner case 12. A ring-shaped filter element 17 is disposed inside the cleaner case 12, and a gasket 18 on the upper surface thereof is on the lower surface of the lid body 14, and a gasket 19 on the lower surface is on the upper surface of the bottom plate 13. The inside of the filter element 17 is inserted into the annular dust side chamber 21 which communicates with the atmospheric air intake pipe 20 integrally formed on the outer peripheral surface of the cleaner case 12. The interior of the chamber cover 15 is divided into an intake chamber 23 and a secondary air chamber 24 in a plan view.
A through hole 2 is defined by partition walls 25 and 26, and an intake chamber 23 and a secondary air chamber 24 are formed in the bottom plate 13.
7 and 28 to the clean side chamber 22, and one intake chamber 23 is connected to the cleaner case 12.
A passage 3 is provided in an outlet pipe 29 integrally formed on the outer peripheral surface of the
0 to connect the outlet pipe 29 to the suction side of the blower compressor 6 via a passage 31;
The other secondary air chamber 24 is communicated via a passage 33 with a secondary air outlet pipe 32 integrally formed on the outer peripheral surface of the cleaner case 12.
is connected to the exhaust manifold 3 via a secondary air supply passage 35 with a check valve 34.

Further, in the clean side chamber 22, a cylindrical partition plate 36 with an open top is provided integrally with the bottom plate 13, and a lid plate 37 is provided on the top surface of the partition plate 36.
By fastening with multiple bolts 38,
The inside of the partition plate 36 is connected to the clean side chamber 22.
and a surge tank chamber 39 that does not communicate with the intake chamber 23 or the secondary air chamber 24, and communicates the surge tank chamber 39 with an inlet pipe 40 integrally formed on the outer peripheral surface of the cleaner case 12 via a passage 41. A supercharging passage 42 from the discharge side of the blower compressor 6 is connected to the inlet pipe 40, while an outlet pipe 43 communicating with the surge tank chamber 39 is integrally connected to the lower surface of the chamber cover 15. The outlet pipe 43 is connected to the inlet pipe part 4 of the vaporizer 7.
Join to 4.

The bottom plate 13, which is a part of the partition wall that separates the surge tank chamber 39 from the secondary air chamber 24 and further from the clean side chamber 22, has a structure that connects the surge tank chamber 39 to the clean side chamber via the secondary air chamber 24. A through hole 51 is provided that communicates with the surge tank chamber 39, and an opening of the through hole 51 into the surge tank chamber 39 is provided with a through hole 51 that communicates with the surge tank chamber 39 when the boost pressure downstream of the blower compressor 6 exceeds a certain value. A part of the supercharged air is passed through the secondary air chamber 24 and the clean side chamber 22 to the intake chamber 2 which is upstream of the blower compressor 6.
3 is provided with a blow-off valve 50 designed to release water to the air.

The air cleaner 11 has two bolts 45 erected from the top surface of the inlet pipe section 44 of the carburetor 7.
a nut 46 protruding from the upper surface of the lid plate 37 of the surge tank chamber 39 and screwed onto the upper end of the bolt 45.
By fastening the inlet pipe part 4 of the carburetor 7
4, and the air cleaner 11
The lid plate 14 is the lid plate 3 of the surge tank chamber 39.
7 with a bolt 47. Further, on the lower surface of the chamber cover 15, a blow-by gas inlet pipe 4 for guiding blow-by gas from the engine 1 to the intake chamber 23 via a passage 48 is provided.
9 is provided. Furthermore, the through hole 51 is connected to the intake chamber 23.
It may also be communicated with the clean side chamber 22 through the , or directly communicated with the clean side chamber 22 .

In this configuration, atmospheric air that flows from the air intake pipe into the dust side chamber 21 of the cleaner case 12 as the engine 1 is operating is filtered and purified by the filter element 17, and then flows from the clean side chamber 22 into the through hole 27. The air enters the blower compressor 6 of the exhaust turbo supercharger 4 through the intake chamber 23 and is compressed, causing dust and dirt in the atmosphere to enter the blower compressor 6 and reduce the durability of its impeller, bearings, etc. Then, the supercharged air compressed by the blower compressor 6 enters the surge tank chamber 39 through the passage 41, where the pulsation is attenuated and eliminated, and the supercharged air is transferred to the next fuel such as the carburetor 7. After the fuel is appropriately supplied at the supply point, it is sucked into the combustion chamber of the engine 1, making it possible to prevent fluctuations in the air-fuel ratio during fuel supply and to avoid a decrease in charging efficiency in a specific rotation range. In addition, when the boost pressure downstream of the blower compressor 6 is reduced during engine deceleration or in a high load area,
When supercharging exceeds a predetermined value, the blow-off valve 5
0 opens, and the supercharged air in the surge tank chamber 39 on the downstream side of the blower compressor 6 passes through the air hole 51 to the intake chamber 23 on the upstream side of the blower compressor 6.
This prevents the supercharging pressure from increasing further.

In this case, the present invention provides an internal combustion engine 1 having the blower compressor 6 and the air cleaner 11 in the intake system as described above.
1, a ring-shaped filter element 17 is provided in the cleaner case 12, and the outside of the filter element 17 is connected to the dust side chamber 21 communicating with the atmospheric air intake pipe 20, and the inside of the filter element 17 is connected to the blower compressor 6. A surge tank 39 is provided inside the clean side chamber 22 and is separated from the clean side chamber 22 by a partition wall 36 to absorb the surge. A tank 39 is inserted into the intake passage from the discharge side of the supercharger to the engine 1, and a blow-off valve 50 for controlling supercharging pressure is provided in the surge tank 39.
The clean side chamber 22 inside the ring-shaped filter element 17 is connected to a surge tank 39 for eliminating pulsation.
Since the inside of the surge tank 39 can be used for installing the air cleaner, the surge tank, and the blow-off valve 50, the space required for installing the air cleaner, the surge tank, and the blow-off valve becomes significantly smaller.
Since the bulkhead constituting the surge tank is surrounded by a cleaner case in the air cleaner, the cleaner case can reduce transmission of noise generated when pulsation in the surge tank is eliminated to the atmosphere. On the other hand, the noise generated when the boost pressure is controlled by the blow-off valve is prevented from being transmitted to the atmosphere by the blocking effect by the bulkhead of the surge tank and the cleaner case.

Therefore, according to the present invention, it is possible to reduce the size and weight of a supercharged internal combustion engine that has an intake system equipped with a supercharger, an air cleaner, a surge tank, and a blow-off valve for controlling boost pressure. This has the effect of eliminating pulsation caused by the tank and reducing noise when controlling supercharging pressure using the blow-off valve.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a schematic diagram of the entire engine, Fig. 2 is a vertical front view of the air cleaner, and Fig. 3 is a sectional view taken from the - side of Fig. 2. 4 is a cross-sectional view of FIG. 2, FIG. 5 is a cross-sectional view of FIG. 3, FIG. 6 is a cross-sectional view of FIG. 3, and FIG. 7 is a cross-sectional view of FIG. 3. FIG. 8 is a cross-sectional view taken from - in FIG. 3. 1...engine, 2...intake manifold, 4...
Exhaust turbo supercharger, 6...Blower compressor, 11
...Air cleaner, 12 ...Cleaner case, 1
7... Filter element, 21... Dust side chamber, 20... Atmospheric air intake pipe, 22... Clean side chamber, 36... Partition wall, 39... Surge tank, 50... Blow-off valve, 51... Through hole .

Claims (1)

[Scope of utility model registration request] In an internal combustion engine having an intake system including a supercharger and an air cleaner, a ring-shaped filter element is provided in a cleaner case of the air cleaner, and the dust side chamber communicates the outside of the filter element with an atmospheric air intake pipe. The inside of the filter element is formed into a clean side chamber communicating with the suction side of the supercharger, and the clean side chamber is provided with a surge tank separated from the clean side chamber by a partition wall. A surge tank is inserted into the intake passage leading from the discharge side of the supercharger to the engine, and a partition wall that separates the surge tank and the clean side chamber is provided with a through hole that communicates the two. An intake system for a supercharged internal combustion engine, which includes a blow-off valve for controlling boost pressure at the opening into the surge tank.