JP2501352Y2 - Engine intake system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an improvement of an intake system of an engine equipped with a pressure wave supercharger.

(Prior Art) Conventionally, as a supercharged engine provided with a supercharger for supercharging intake air, the engine is rotatably supported in a case as disclosed in, for example, JP-A-61-31652. And a large number of partition walls forming a plurality of small chambers are radially arranged, an intake inlet and an intake outlet formed in a case on one end side of the rotor, and a case on the other end side of the rotor. It is known to have a pressure wave supercharger that has an exhaust introduction port and an exhaust discharge port, and that transmits the pressure wave energy of the exhaust gas to the intake air as the rotor rotates to supercharge the intake air. There is.

(Problems to be solved by the invention) By the way, in an engine equipped with a pressure wave supercharger as described in the above publication, a passage on the intake side is connected to one end of the pressure wave supercharger and an exhaust side passage is connected to the other end. Both the intake side and the exhaust side are provided with two systems of passages for intake to the rotor chamber of the pressure wave supercharger and discharge from the rotor chamber. Further, a transmission mechanism (for example, a belt transmission mechanism) that transmits the driving force from the output shaft of the engine to drive the rotor to rotate.
Is provided on one end side of the pressure wave supercharger, and it is desirable that this transmission mechanism is provided on the intake side of the pressure wave supercharger so that the influence of exhaust heat or thermal displacement caused thereby is less likely to occur.

Since the structure of such a pressure wave supercharger and the downstream side of the exhaust passage are arranged downward, in terms of the layout,
The pressure passage is connected to two passages forming an intake passage connected to the pressure wave supercharger, that is, an intake side intake passage connected to the intake inlet and a discharge side intake passage connected to the intake outlet. It is conceivable to arrange it above the feeder and so as to be substantially parallel to the rotor axis. In this case, since one end of each of the two intake passages is connected and fixed to the pressure wave supercharger, vibration from the pressure wave supercharger is transmitted and vibration noise is generated.

As a countermeasure, it is possible to fix it at multiple points on a member that is firmly fixed in proximity to something other than the pressure wave supercharger and that does not affect the heat from the engine side (for example, inlet manifold). Conceivable. However, in this case, although the vibration noise of the intake passage is suppressed, the vibration from the pressure wave supercharger is transmitted from the fixed portion to the mounting member via these members, and the vibration of the mounting member is generated. Therefore, there is a concern that the noise and vibration intensity of the mounting member and other parts provided on the mounting member may be affected.

The present invention has been made in view of these points,
The purpose is that in an engine equipped with a pressure wave supercharger, vibrations from the pressure wave supercharger are transmitted to an intake passage connected to the pressure wave supercharger and a mounting member for fixing the intake passage. It is to prevent adverse effects.

(Means for Solving the Problems) In order to achieve the above object, in the present invention, the transmission relationship of vibrations from the pressure wave supercharger is reduced by mounting the two intake passages connected to the pressure wave supercharger. I am trying to do it.

Specifically, the solution means taken by the present invention is that a rotor is rotatably supported in a case, and a plurality of partition walls forming a plurality of small chambers are radially arranged, and a rotor is formed on a case at one end side of the rotor. The intake air intake port and the intake air discharge port, and the exhaust gas intake port and the exhaust gas exhaust port formed in the case on the other end side of the rotor, and the pressure wave energy of the exhaust gas is transmitted to the intake air as the rotor rotates. It is premised on an engine equipped with a pressure wave supercharger for supercharging intake air. The rotor shaft of the rotor is arranged parallel to the engine output shaft direction. Further, an intake air intake pipe is connected to the intake air intake port, and a discharge air intake pipe is connected to the intake air discharge port through elastic bodies, and both intake pipes are parallel to each other above the pressure wave supercharger in parallel with the engine. It is arranged so as to be substantially parallel to the output shaft direction and is fastened together with the inlet manifold in the lower part thereof at right angles to the rotor shaft in the direction of the engine body from the rotor shaft side.

(Operation) With the above configuration, in the present invention, the intake intake pipe and the discharge intake pipe that form the intake passage for intake and discharge of the intake air to the pressure wave supercharger are pressured through the elastic body, respectively. Since it is connected to the wave supercharger, the vibration is absorbed by this elastic body and the transmission of the vibration from the pressure wave supercharger to both the intake pipes is reduced, and the exhaust side of the pressure wave supercharger is reduced. Even if the connection position between the two intake pipes changes due to thermal displacement due to exhaust heat at 1, the elastic body allows this change and prevents the occurrence of cracks in the connection portion.

Further, since both of the intake pipes are arranged in parallel above the pressure wave supercharger and substantially parallel to the engine output shaft direction, the space above the pressure wave supercharger is effectively used and compacted. ing.

Further, since both of the intake pipes are fastened together in the lower portion thereof to the inlet manifold in a direction orthogonal to the rotor shaft and from the rotor shaft side in the engine body direction, they are directly fixed to the inlet manifold serving as a mounting member. , Its vibration is effectively suppressed. In particular, since the intake pipes are fixed in the lower portion of both intake pipes in the direction perpendicular to the rotor shaft from the rotor shaft side in the engine main body direction, vertical vibration, which is caused by the weight of the pipes, is effectively suppressed. Further, since they are fastened together at the lower part of the pipe, the dead space between the both intake pipes and the pressure wave supercharger can be used as a space for disposing the boss for fastening together.
Further, as described above, since both the intake pipes are fixed to the inlet manifold by co-fastening, the vibrations are effectively suppressed, so that the fixing points can be minimized, and the vibrations from the pressure wave supercharger are the same as the above intake airs. There are also fewer paths through the pipe to the inlet manifold, so there are fewer sources of vibration input to the inlet manifold, which reduces the transmission of vibrations from the pressure wave supercharger to the inlet manifold, reducing the noise and vibration of the inlet manifold. Planned.

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

FIG. 1 shows a schematic configuration of an engine with a pressure wave supercharger equipped with an intake device according to an embodiment of the present invention. In the figure,
1 is a 4-cylinder engine, 2 is an upstream end opened to the atmosphere, and a downstream end is branched through passages 2a to 2d to the cylinders 3, 3 ...
The intake passage 4, which opens to the cylinders 3 and 3 of the engine 1 to supply intake air, has its upstream end opened to the cylinders 3 and 3 of the engine 1 through the branch passages 4a to 4d and to the downstream. It is an exhaust passage whose end is open to the atmosphere and discharges exhaust gas from each cylinder 3, 3 of the engine 1.

Reference numeral 5 is a pressure wave supercharger which is disposed across the intake passage 2 and the exhaust passage 4 and is rotationally driven by the engine 1 via a belt transmission mechanism (not shown) provided on the engine front side. As is well known, the pressure wave supercharger 5 has a rotor rotatably supported in a case, and a large number of partition walls are radially arranged on the outer circumference of the rotor. A large number of small chambers are formed in the circumferential direction. An intake inlet 6 and an intake outlet 7 are formed in the case on one end side of the rotor. The intake inlet 6 is located upstream of the pressure wave supercharger 5 in the intake passage 2, and the intake outlet 7 is The pressure wave supercharger 5 communicates with the downstream side, respectively. An exhaust inlet 8 and an exhaust outlet 9 are formed in the case on the other end side of the rotor, and communicate with the upstream and downstream sides of the pressure wave supercharger 5 in the exhaust passage 4, respectively. Then, when the high-pressure exhaust gas flows into the small chamber in which the low-pressure intake air is confined as the rotor rotates, a pressure wave (compression shock wave) is generated due to the pressure difference and propagates in the small chamber. By transmitting the pressure wave energy of the exhaust gas to the intake air, the intake air is compressed and accelerated to be discharged from the intake air discharge port 7 to supercharge the intake air, and then the exhaust gas flowing into the small chamber is discharged to the exhaust gas discharge port 9 It is configured to repeat the process of exhausting the exhaust gas, and introducing the intake air into the small chamber from the intake air intake port 6 to perform scavenging of the exhaust gas.

Reference numeral 10 denotes an intake valve that opens and closes the openings of the branch passages 2a to 2d of the intake passage 2 at a predetermined timing.
By opening and closing 10, 10, ..., intake air is introduced into each cylinder 3, 3, ... at a predetermined timing. Reference numeral 11 denotes an air-cooling type intercooler provided on the downstream side of the pressure wave supercharger 5 in the intake passage 2, and uses high-temperature intake air supercharged from the pressure wave supercharger 5 as outside air (running wind). It is cooled by heat exchange with. Further, 12 is a pressure wave supercharger 5 in the intake passage 2.
The air cleaner is provided on the upstream side, and the intake air inlet 6 of the pressure wave supercharger 5 is communicated with the atmosphere via the air cleaner 12. Further, an intake bypass passage 13 that communicates with the intake passage 2 upstream of the intercooler 11 by bypassing the pressure wave supercharger 5 from the air cleaner 12 is provided. A one-way valve 14 that allows the flow of intake air from the upstream side to the downstream side of the bypass passage 13 and blocks the reverse flow thereof is provided, and the downstream end opening of the intake bypass passage 13 is formed from this downstream end opening. Valve 15 for selectively switching communication between the intake bypass passage 13 with respect to the downstream side intake passage 2 or the intake passage 2 upstream with respect to the downstream end opening.
Are arranged. When the engine is started, the switching valve 15 is switched so that the intake passage 2 upstream of the downstream end opening is closed and the intake bypass passage 13 communicates with the intake passage 2 downstream of the downstream end opening. By controlling, the intake bypass passage 13 is opened, and the intake air upstream of the pressure wave supercharger 5 is not sucked into the pressure wave supercharger 5 and is bypassed to the downstream of the pressure wave supercharger 5 via the intake bypass passage 13. The starting valve device 16 is configured to flow down, thereby reducing the engine load at the time of starting and ensuring good startability.

On the other hand, exhaust valves 17, 17, ... Are arranged at the openings of the branch passages 4a to 4d at the upstream end of the exhaust passage 4, and the above-mentioned openings are opened and closed at predetermined timings for the respective cylinders 3,3. I try to derive the exhaust from. Reference numeral 18 denotes a catalyst for purifying exhaust gas, which is provided upstream of the pressure wave supercharger 5 in the exhaust passage 4, and exhausts the exhaust gas discharged from the engine 1 through the catalyst 18 to an exhaust introduction port. It has been introduced into the pressure wave supercharger 5 from 8. Reference numeral 19 denotes a recirculation passage for recirculating a part of the exhaust gas to the intake system, one end of which opens to the exhaust passage 4 immediately downstream of the catalyst, and the other end of which is located downstream of the intercooler 11. A recirculation control valve 20 that opens into the intake passage 2 and controls the opening / closing of the recirculation passage 19 is provided in the middle of the recirculation passage 19. Then, by controlling the recirculation control valve 20, the exhaust gas recirculation amount is adjusted according to the operating state. Further, in the exhaust passage 4, the upstream side and the downstream side of the pressure wave supercharger 5 are communicated with each other via an exhaust bypass passage 21 so as to bypass the pressure wave supercharger 5, and the exhaust bypass A waste gate valve 22 is provided in the middle of the passage 21 to control the opening and closing of the exhaust bypass passage. When the supercharging pressure of the intake air by the pressure wave supercharger 5 becomes higher than or equal to the set pressure, the waste gate valve 22 is controlled in the opening direction so that the exhaust gas bypasses the pressure wave supercharger 5 and flows down. , The boost pressure is adjusted so that it does not exceed the set pressure.

Next, detailed arrangement and mounting relationship of the intake passage 2 according to the intake device of the present invention will be described with reference to FIGS. FIG. 2 shows the pressure wave supercharger and the intake system as seen from the engine front side, FIG. 3 shows the intake system connected to the pressure wave supercharger as seen from above the engine, and FIG. Figure A
-A line cross section is shown. In FIGS. 2 and 3, first,
The pressure wave supercharger 5 is arranged such that its rotor shaft is parallel to the output shaft direction (cylinder row direction) of the engine 1.
At the one end side (engine front side) of the pressure wave supercharger 5, an intake inlet 6 and an intake outlet 7, which open upward, are discharged side by side. The intake / exhaust port 7 is arranged at. In addition, the pressure wave supercharger 5 is connected to the pressure wave supercharger 5.
The intake intake pipe 30 and the discharge intake pipe 31, which form the intake passage 2 immediately upstream and downstream of the engine, are arranged in parallel above the pressure wave supercharger 5 and substantially parallel to the output axis direction of the engine 1. There is. Then, one end of the intake air intake pipe 30 is opened downward at a position corresponding to the intake air intake port 6 and is connected to the intake air intake port 6 by a rubber hose 32.
The other end is connected to the intake passage 2 on the downstream side of the air cleaner 12. Further, one end of the discharge intake pipe 31 is opened downward at a position corresponding to the intake discharge port 7 and is connected to the intake discharge port 7 by a rubber hose 33, and the other end is an intake passage upstream of the intercooler 11. Connected to 2.
Further, 34 is constituted by branch passages 2a to 2d having one end branched to supply intake air to each cylinder 3, 3 of the engine 1 and fixedly connected to the engine 1, and the other end is downstream of the intercooler 11. Inlet manifold connected to the intake passage 2
34. Further, as shown in FIG. 3 and FIG. 4, bosses 30a and 31a respectively correspond to the lower portions of the intake pipes 30 and 31 on the side opposite to the connection side with the pressure wave supercharger 5. The inlet manifold 34 is provided with
A mounting seat 34a is provided at a position corresponding to these bosses 30a and 31a. The bosses 30a and 31a are fastened together with the mounting seat 34a by bolts 35 to fix the intake pipes 30 and 31 to the inlet manifold 34 at one place. At this time, the bolt 35 is orthogonal to the rotor shaft of the pressure wave supercharger 5 and fastens the bosses 30a, 31a from the rotor shaft side toward the main body of the engine 1.

The intake passage 2 is configured as described above, whereby the intake air is introduced into the rotor chamber of the pressure supercharger 5 from the intake introduction port 6 through the intake intake pipe 30 after passing through the air cleaner 12. Then, here, the high pressure energy of the exhaust gas is transmitted to the intake air, and after being pressurized and accelerated, the intake air discharge port 7
Is discharged from the intercooler through the discharge intake pipe 31.
Inlet manifold 34
Is supplied to each cylinder 3,3 ....

Therefore, in the above-described embodiment, since the intake air intake pipe 30 and the discharge air intake pipe 31 forming the intake passage 2 are connected to the pressure wave supercharger 5 by the rubber hoses 32 and 33, the pressure wave supercharger 5 Vibration is caused by the above rubber hoses 32,3
It is possible to reduce the transmission of vibration to the intake pipes 30 and 31 which are absorbed by the intake pipe 3, and at the same time, due to thermal displacement due to exhaust heat on the exhaust side of the pressure wave supercharger 5, the intake pipes 30 and 31
Even if the connection position with the fluctuates, the fluctuation is allowed by the rubber hoses 32 and 33, and the occurrence of cracks at the connection part can be prevented.

Further, since both of the intake pipes 30 and 31 are arranged in parallel above the pressure wave supercharger 5 and substantially parallel to the output shaft direction of the engine 1, the space above the pressure wave supercharger 5 can be effectively used. It can be used and compacted.

Further, both of the intake pipes 30 and 31 are provided at one place on the mounting seat 34a of the inlet manifold 34 by the bolts 35 in the engine body direction from the rotor shaft side orthogonal to the rotor shaft in the bosses 30a and 31a provided in the lower part. Since they are fastened, they are fixed directly to the inlet manifolds 34 serving as mounting members, and even if they are fixed at one place, their vibrations can be effectively suppressed. In particular, since the intake pipes 30 and 31 are fixed in the lower portion of the intake pipes 30 and 31 in the direction of the engine body from the rotor shaft side orthogonal to the rotor shaft, it is possible to effectively suppress the vertical vibration that is caused by the weight of the pipe itself. . Further, since the bosses 30a and 31a provided at the bottoms of the intake pipes 30 and 31 are fastened together, the intake pipes 30 and 31 are provided as space for disposing the bosses 30a and 31a.
A dead space between the pressure wave supercharger 5 and the pressure wave supercharger 5 can be used. Further, since there is only one fixing point to the inlet manifold 34, there is also one path where the vibration from the pressure wave supercharger 5 is transmitted to the inlet manifold 34 via both the intake pipes 30 and 31. Since there is only one vibration input source to the inlet manifold 34, transmission of vibration from the pressure wave supercharger 5 to the inlet manifold 34 can be reduced, and vibration noise of the inlet manifold 34 can be reduced.

The rubber hoses 32 and 33 in the above embodiment may be connection members made of an elastic body other than rubber. Further, the positions of the intake introduction port 6 and the intake discharge port 7 of the pressure wave supercharger 5 may be reversed.

(Effects of the Invention) As described above, according to the intake device of the engine with a pressure wave supercharger of the present invention, the intake intake pipe and the discharge intake pipe forming the intake passage are pressure waved through elastic bodies. While being connected to the supercharger, both of the intake pipes are arranged above the pressure wave supercharger in parallel and substantially parallel to the engine output shaft direction, and below the rotor shaft of the pressure supercharger. Since they are orthogonally fastened together with the inlet manifold in the engine body direction from the rotor shaft side, it is possible to fix both intake pipes to the inlet manifold while reducing transmission of vibrations from the pressure wave supercharger. Vibration noise of the intake manifold and the intake system such as the intake pipes due to the vibration from the pressure wave supercharger can be suppressed. Further, the space above the pressure wave supercharger can be effectively used without forming a dead space.

[Brief description of drawings]

1 to 4 show an embodiment of the present invention, FIG. 1 is an overall schematic configuration diagram thereof, FIG. 2 is a front view of an essential part seen from the engine front side, and FIG. 3 is seen from above the engine. 4 is a sectional view taken along the line AA in FIG. 3. 1 ... Engine 2 ... Intake passage 4 ... Exhaust passage 5 ... Pressure wave supercharger 6 ... Intake inlet 7 ... Intake discharge port 30 ... Intake intake pipe 31 ... Discharge intake pipe 32, 33 ... … Rubber hose 34 …… Inlet manifold

Claims (1)

(57) [Scope of utility model registration request] 1. A rotor, which is rotatably supported in a case, in which a large number of partition walls that form a large number of small chambers are radially arranged, and an intake port and an intake port formed in the case on one end side of the rotor. It has an outlet, an exhaust inlet and an exhaust outlet formed in the case on the other end side of the rotor, and transmits the pressure wave energy of the exhaust to the intake air to supercharge the intake air as the rotor rotates. In an engine equipped with a pressure wave supercharger, the rotor shaft of the rotor is arranged parallel to the engine output shaft direction, and the intake intake pipe is elastically connected to the intake air intake port and the discharge intake pipe is elastically connected to the intake air discharge port. Both of the intake pipes are connected in parallel with each other above the pressure wave supercharger in parallel and substantially parallel to the engine output shaft direction, and are orthogonal to the rotor shaft at the lower part thereof. An intake system for an engine, characterized by being fastened together from the rotor shaft side to the engine body direction to the inlet manifold.