JP2004044528A - Intake device for rotary engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an intake device for a rotary engine capable of assuring pulsation effect (high intake efficiency). <P>SOLUTION: This intake device comprises two intake ports 34, 36, 35, 41; two operating chambers 31 in which each of first and second intake passages 49, 50, 53, 54 are connected to each of the intake ports 34, 36, 35, 41; junction portions 51, 55 formed by jointing the first intake passages 49, 53 of each of the operating chambers 31, 31 to the second intake passages 50, 54 on the upstream side; a communication passage 57 for communicating the intake passages of the front and rear operating chambers 31, 31 and a communication control means 58 which cuts off and open the communication passage 57 according to the running condition of the engine between the junction portions 51, 55 and a junction portion 21 of the intake passages of the front and rear operating chambers 31, 31. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
According to the present invention, there is provided a working chamber having two intake ports (intake ports), each of which is connected to a first intake passage (primary intake passage) and a second intake passage (secondary intake passage). The present invention relates to an intake device for a rotary engine.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as an intake device for a rotary engine of the above-described example, for example, there is an intake device disclosed in Japanese Patent Publication No. 5-17373.
That is, in a rotary engine having a two-rotor structure, a primary port and a secondary port as two intake ports are connected to one working chamber, and a first intake passage and a second intake passage are connected to each of these intake ports. In this case, two first intake passages and two second intake passages are connected to a total of two working chambers.
That is, two independent intake passages are provided for each rotor, and all the intake passages are connected upstream of the intake passages.
[0003]
In order to reduce the intake resistance in the intake device of the rotary engine having the above configuration, it is preferable to increase the curvature of the intake passage and extend the intake passage in one direction. However, such a configuration reduces the pulsation effect. However, there is a problem that it is difficult to sufficiently improve the intake efficiency.
[0004]
Here, the above-mentioned pulsation effect utilizes the pressure generated by the inertia of the intake air, and when the intake port of the engine starts to close, the air flowing at high speed in the intake pipe until then is blocked by the intake port. The pressure increases due to the inertia of the air itself. The high pressure generated at this time becomes a compression wave, travels back at the sonic speed in the intake pipe, and is further transmitted to the adjacent intake pipe on the rotor side through the junction of the intake passage between the cylinders. The action of pushing more air into the engine by adjusting the timing so that the compression wave reaches the intake port when the adjacent intake port on the rotor side is closing (inter-cylinder intake interference due to inertia). It is.
[0005]
[Problems to be solved by the invention]
According to the present invention, a communication passage communicating the intake passages of the front and rear working chambers is provided between a junction upstream of the first intake passage and the second intake passage and a joining portion of the intake passages of the front and rear working chambers. By providing communication control means for shutting off and opening the passage in accordance with the operation state of the engine, the curvature of the first intake passage is increased to extend the intake passage in one direction as much as possible, thereby reducing intake resistance. However, by providing a communication path and communication control means between the junction of the first and second intake passages and the junction of the intake passages of the front and rear working chambers, the pulsation effect (improvement of intake efficiency) The object of the present invention is to provide an intake device for a rotary engine capable of ensuring the above conditions.
[0006]
[Means for Solving the Problems]
An intake device for a rotary engine according to the present invention has two intake ports, each of which has two working chambers in which first and second intake passages are connected, respectively. The intake passage and the second intake passage are merged upstream to form a junction, and between the junction and the junction of the intake passages of the front and rear working chambers, the intake passages of the front and rear working chambers are connected. The communication device includes a communication passage communicating with the communication passage, and communication control means for opening and closing the communication passage in accordance with an operation state of the engine.
[0007]
The communication control means having the above configuration may be constituted by a solenoid valve and an actuator and a VDI (Variable Dynamic Intake System) valve, and the communication passage may be integrally formed inside a VDI valve having a rotary valve structure. Good.
[0008]
According to the above configuration, since the communication control means is provided upstream of the junction of the first intake passage and the second intake passage, the curvature of the first intake passage is increased to make the intake passage as small as possible. In this case, the intake resistance can be reduced.
[0009]
In addition, since the communication path and the communication control means are provided between the junction of the first and second intake passages and the junction of the intake passages of the front and rear working chambers, the pulsation effect (intake efficiency Improvement) can be secured.
[0010]
In one embodiment of the present invention, the second intake passage is provided with a first opening / closing valve for opening and closing the passage in accordance with an operation state of the engine, and each of the working chambers has a third intake port and a third intake port. A third intake passage communicating with the first intake passage is provided, and a second on-off valve for opening and closing the third intake passage in accordance with an operation state of the engine is provided.
[0011]
The first on-off valve having the above configuration may be constituted by a rotary structure SSV (secondary shutter valve), and the second on-off valve may be constituted by an APV (original port valve) having an opening formed in a cylindrical member. You may comprise.
According to the above configuration, the communication control unit, the first on-off valve, and the second on-off valve are controlled to open and close according to the operating state of the engine such as the engine speed, thereby minimizing a torque step due to a change in engine speed. Can be reduced.
[0012]
In one embodiment of the present invention, in a rotary engine having a two-rotor structure, the two second on-off valves are interlocked with each other by interlocking means, and the interlocking means is driven by a single driving means. is there.
[0013]
The interlocking means having the above configuration may be constituted by a rack and pinion mechanism, or may be constituted by a link and an arm. Further, the driving means may be constituted by a motor or an actuator.
According to the above configuration, the two second on-off valves can be simultaneously driven by a single driving unit, so that the number of parts and the number of assembling steps can be reduced.
[0014]
【Example】
An embodiment of the present invention will be described below in detail with reference to the drawings.
The drawing shows an intake device of a rotary engine. In FIG. 1, an oil pan 2 is provided at a lower portion of an engine body 1, and an intake manifold 4 is attached to one side surface of the engine body 1 via a flange 3. The exhaust passage 6 is attached via the.
[0015]
The engine body 1 is mounted on the vehicle body such as a suspension cross member via an engine mount bracket 7 and an engine mount 8. In FIG. 1, 9 is an electric secondary air pump, 10 is a secondary air supply pipe, and 11 is a flywheel. Arrow F indicates the front of the vehicle, and arrow R indicates the rear of the vehicle.
[0016]
FIG. 2 is a plan view showing only the intake system, in which an air cleaner 12 for purifying intake air is provided, and a first fresh air duct 13 and a second fresh air duct 14 are connected and connected to an intake inlet of the air cleaner 12. I have.
[0017]
The first fresh air duct 13 is bent substantially in an L-shape in plan view and extends forward of the vehicle. A second fresh air duct 14 branched from the first fresh air duct 13 is substantially linearly connected to the front portion of the vehicle. In the second fresh air duct 14, a fresh air valve 16 controlled to be opened and closed by an actuator 15 is provided.
[0018]
An air flow sensor 17 is attached to the purified air outlet of the air cleaner 12, and a throttle body 19 is disposed at the outlet via an air intake hose 18.
[0019]
An extension manifold 20 is attached to the downstream side of the above-mentioned throttle body 19, and the extension manifold 20 is branched into two passages 22 and 23 via a first junction 21. The extension manifold 20 is attached to the intake manifold 4 described above.
[0020]
FIG. 3 is a system diagram showing an intake device of the rotary engine, and FIG. 4 is an enlarged view of a main part of FIG. 1. In the above-described air cleaner 12, an element 24 is sandwiched between an upper case and a lower case. A throttle valve 25 is provided in the throttle body 19.
[0021]
As shown in FIG. 3, the above-described engine body 1 is an integrated body of a front side housing 26, a rotor housing 27, an intermediate housing (intermediate side housing) 28, a rotor housing 29, and a rear side housing 30. The rotors 32, 33 driven by eccentric shafts are arranged in the respective working chambers 31 in the two rotor housings 27, 29 to constitute a rotary engine having a two-rotor structure (a two-cylinder rotary piston engine). ing.
[0022]
Further, primary ports 34 and 35 as intake ports are formed in the intermediate housing 28 so as to communicate with the front and rear working chambers 31, 31, and the first cylinder working chamber 31 ( A secondary port 36 and an auxiliary port 37 are formed so as to communicate with a front working chamber, and a side intake port type is formed. In the auxiliary port 37, an opening 39 (a so-called window) is formed in a cylindrical member 38. ) Is provided with an auxiliary port valve 40 as a second on-off valve.
[0023]
Similarly, a secondary port 41 and an auxiliary port 42 are formed in the rear side housing 30 so as to communicate with a working chamber 31 (rear working chamber) of the second cylinder, and a side absorption port type is formed. In the auxiliary port 42, an auxiliary port valve 45 as a second opening / closing valve having an opening 44 formed in the cylindrical member 43 is provided.
[0024]
On the other hand, two auxiliary intake passages 47 and 48 are formed from the branch portion 46 upstream of the first junction 21 in the extension manifold 20, and these auxiliary intake passages 47 and 48 are provided downstream of the throttle body 19. We are communicating.
[0025]
In the first cylinder on the front side, a first intake passage 49 communicating the primary port 34 and the passage 22 of the extension manifold 20 is provided, and the upper end of the second intake passage 50 connected to the secondary port 36 is connected to the first intake passage 49. The second merging portion 51 is formed by merging at the upstream portion.
Further, a third intake passage 52 communicating with the auxiliary port 37 via the auxiliary port valve 40 is provided, and the third intake passage 52 is connected to the auxiliary intake passage 47 on the front side.
[0026]
Similarly, in the second cylinder on the rear side, a first intake passage 53 communicating the primary port 35 and the passage 23 of the extension manifold 20 is provided, and the upper end of the second intake passage 54 connected to the secondary port 41 is connected to the first intake passage. The second merging portion 55 is formed by merging at an upstream portion of the passage 53.
Further, a third intake passage 56 communicating with the auxiliary port 42 via the auxiliary port valve 45 is provided, and the third intake passage 56 is connected to the auxiliary intake passage 48 on the rear side.
[0027]
FIG. 5 shows a cross-sectional structure of the second junction 51 on the front side. The second junction 51 is formed in an elliptical shape, and has a substantially circular first intake passage 49 and second It is branched into an intake passage 50. Note that the rear junction 55 has the same configuration.
[0028]
As shown in FIG. 3, second merging portions 51 and 55 where the first intake passages 49 and 53 of the working chambers 31 and the second intake passages 50 and 54 join each other, and the front and rear working chambers 31 and 31 Between the first junction (the junction between the cylinders) 21 of the intake passage, the intake passages of the front and rear working chambers 31, 31 (in this embodiment, the first upstream of the second junctions 51, 55). A communication path 57 that communicates between the upper end portions of the intake paths 49 and 53) and a rotary valve type VDI valve 58 that opens and closes the communication path 57 according to the operating state of the engine are provided.
[0029]
In this embodiment, the communication path 57 is integrally formed inside the VDI valve 58, and the VDI valve 58 includes a communication control means 59 (see FIG. 10) composed of an actuator and a solenoid valve.
[0030]
Since the VDI valve 58 is provided on the upstream side of the above-mentioned second merging sections 51 and 55, the first intake passages 49 and 53 have a large curvature as shown in FIG. It can be configured to extend in one direction.
[0031]
Further, the second intake passages 50, 55 are configured to be close to each other at a substantially middle portion in the vertical direction of the first intake passages 49, 53, and the two second intake passages 50, 55 are provided in the proximity of the engine. Is provided with a shutter valve 60 as a first opening / closing valve that opens and closes simultaneously according to the operation state of.
[0032]
As shown in FIG. 6, the shutter valve 60 has a valve body 61 formed with a passage portion 62 and a blocking portion 63 corresponding to one second intake passage 50, and a passage portion corresponding to the other second intake passage 54. This is a rotary valve formed with a shut-off portion 64 and a shut-off portion 65, and is opened and closed by an actuator 66 shown in FIG.
[0033]
FIG. 7 is a bottom view of a main part of FIG. 1. As shown in FIGS. 7 and 3, auxiliary port valves 40 and 45 as second on-off valves are inserted into side housings 26 and 30. It is configured to rotate by a predetermined angle while being supported by the side housings 26 and 30.
[0034]
FIGS. 8 and 9 show a structure in which the two auxiliary port valves 40 and 45 are simultaneously driven by a single driving means, and a plate provided between the flange 3 of the intake manifold 4 and the engine body 1. The auxiliary port valves 40 and 45 described above are rotatably disposed on the plate 67.
[0035]
Each of these auxiliary port valves 40, 45 has a projection 40a, 45a integrally or integrally formed on the outer periphery thereof. Each of the projections 40a, 45a is connected to a rack member via a link 68, 69. 70 is pin-connected. That is, the respective ends of the links 68 and 69 are connected to the protruding portions 40a and 45a and the ends of the rack member 70 using the pins.
[0036]
A pinion 72 meshing with the rack 71 of the above-described rack member 70 is provided, and a driving gear 75 fitted to a rotating shaft 74 of a motor 73 is meshed with the pinion 72.
[0037]
The above-described motor 73 is arranged between the downstream portions of the first intake passage 49 and the second intake passage 50, as shown in FIGS.
Further, stoppers 76, 77, 78, 79 for restricting the rotation amounts of the valves 40, 45 are fixed upright on the plate 67 near the outer periphery of the above-mentioned auxiliary port valves 40, 45.
[0038]
The above-described auxiliary port valves 40 and 45 are valves for varying the intake port timing to obtain an output, and these auxiliary port valves 40 and 45 are driven by a motor 73 as a single driving unit. Are simultaneously opened and closed via a rack and pinion mechanism as an interlocking means.
[0039]
FIG. 10 shows a control circuit of the intake device of the rotary engine. The CPU 80 as the control means is enabled in the ROM 82 based on the engine speed Ne from the distributor 81 and the intake air amount Qa from the air flow sensor 17. according to the program, the actuator 15, the communication control unit 59, actuator 66, drives and controls the motor 73, also RAM83 engine speed driving each element _{15,59,66,73 N 1, N 2, N} 3, N 4 (However, this is storage means for storing necessary data such as data corresponding to N ₁ <N ₂ <N ₃ <N ₄ ) (see FIG. 11).
[0040]
Figure 11 shows a characteristic diagram of the engine output to the engine rotational speed Ne, the fresh air valve 16, VDI valve 58 is in the range the engine speed Ne is _N 0 to N _1, the shutter valve 60, the auxiliary port valve 40 and 45 respectively Since the intake passage is closed, intake is performed only from the first intake passages 49 and 53.
[0041]
That is, in the low rotation region of the engine, by performing intake only from one first intake passage 49, 53 per cylinder, the intake flow velocity is increased, the combustibility is improved, and the torque on the low speed side is improved. Things.
[0042]
When the engine speed Ne is in the range of N _{1 to} N ₂ , the shutter valve 60 provided in the second intake passages 50 and 54 is opened, and both the first intake passages 49 and 53 and the second intake passages 50 and 54 are opened. Perform inspiration from.
In the range the engine speed Ne is N ₂ or by opening the auxiliary port valve 40, 45 in conjunction with the opening of the shutter valve 60, to ensure output by varying the intake timing.
[0043]
In the range the engine speed Ne is N ₃ or opens the VDI valve 58 in conjunction with the opening of the shutter valve 60 and the auxiliary port valves 40 and 45, to improve the intake efficiency by pulsation effect.
[0044]
In the range the engine speed Ne is _{N 4} or in conjunction with the opening of the above valves of 60,40,45,58, opens the fresh air valve 16, maneuverability is long, the first fresh air duct 13 is large intake resistance In addition, fresh air is sucked from both the second fresh air duct 14 having a small intake resistance and a sufficient intake amount in a high engine speed region.
[0045]
Each valve 60,40,45,58,16 described above have been always open at each rotation threshold _{N 1, N 2, N 3} , N 4 or more, and P in FIG. 11 is a primary (Primary) indicates that the intake from the first intake passages 49 and 53 is to be executed, S indicates the secondary (secondary) and indicates that the intake from the second intake passages 50 and 54 is to be executed, and A Is an abbreviation of auxiliary (auxiliary), and indicates that intake from the third intake passages 52 and 56 is executed.
[0046]
By controlling the opening and closing of the fresh air valve 16, the VDI valve 58, the shutter valve 60, and the auxiliary port valves 40 and 45 in accordance with the operation state of the engine, the engine output corresponding to the engine speed Ne (characteristic a in FIG. Reference) can be obtained, and a torque step due to a change in engine speed can be reduced as much as possible.
[0047]
As described above, the intake device of the rotary engine according to the embodiment shown in FIGS. 1 to 10 has two intake ports (see intake ports 34, 35, 36, and 41). There are provided two working chambers 31 to which the second intake passages 49, 53, 50, 54 are connected, and the first intake passages 49, 53 and the second intake passages 50, 54 of the respective working chambers 31, 31 are connected to each other. They are merged upstream to form a merging portion (see second merging portions 51 and 55) and a merging portion (see first merging portion 21) between the merging portions 51 and 55 and the intake passages of the working chambers 31 before and after. ), A communication passage 57 that communicates the intake passages of the front and rear working chambers 31, and communication control means 59 that shuts off and opens the communication passage 57 according to the operating state of the engine (however, the VDI valve 58 (Including).
[0048]
According to this configuration, the communication control means 59 is provided upstream of the second junctions 51, 55 between the first intake passages 49, 53 and the second intake passages 50, 54. By increasing the curvature of 53, the intake passages 49 and 53 can be extended in one direction as much as possible to reduce intake resistance.
[0049]
However, the communication between the second junctions 51, 55 of the first and second intake passages 49, 53, 50, 54 and the first junction 21 of the intake passages of the front and rear working chambers 31, 31 is performed. Since the passage 57 and the communication control means 59 are provided, a pulsating effect (improvement of intake efficiency) can be ensured at the time of communication.
[0050]
Further, the second intake passages 50, 54 are provided with a first opening / closing valve (see a shutter valve 60) for opening and closing the passages 50, 54 in accordance with the operating state of the engine. (See auxiliary ports 37, 42) and third intake passages 52, 56 communicating with the intake ports are provided. The second opening / closing opening / closing the third intake passages 52, 56 according to the operating state of the engine A valve (see auxiliary port valves 40 and 45) is provided.
[0051]
According to this configuration, the communication control means 59 (including the VDI valve 58), the first on-off valve (see the shutter valve 60), and the second on-off valve (see the auxiliary port valves 40 and 45) are connected to the engine. By controlling the opening and closing according to the operating state of the engine such as the number of revolutions, it is possible to minimize the torque step due to the change in the engine rotation as shown by the characteristic a in FIG.
[0052]
Further, in a rotary engine having a two-rotor structure (a two-cylinder rotary piston engine), the two second on-off valves (see auxiliary port valves 40 and 45) are interlocked with each other by interlocking means (see rack member 70 and pinion 72). , The interlocking means is driven by a single driving means (see the motor 73).
[0053]
According to this configuration, the two second on-off valves (see the auxiliary port valves 40 and 45) can be simultaneously driven by a single driving means (see the motor 73), so that the number of parts and the number of assembling steps are reduced. Can be achieved.
[0054]
FIG. 12 shows another embodiment of the intake device of the rotary engine, in which a main link 84 is used instead of the rack member 70 shown in FIGS. The pin 86 provided at the free end of the arm 85 is inserted into the long hole 84a of the main link 84, and the swing of the arm 85 is converted into a linear reciprocating motion of the main link 84. The auxiliary port valves 40 and 45 are configured to open and close.
[0055]
With this configuration, the number of components can be further reduced and the number of assembling steps can be further reduced as compared with the structure shown in FIGS.
[0056]
In the embodiment of FIG. 12, the other configurations, operations, and effects are the same as those of the previous embodiment. Therefore, in FIG. Omitted.
[0057]
In correspondence between the configuration of the present invention and the above-described embodiment,
The two intake ports of the present invention correspond to primary ports 34, 35 and secondary ports 36, 41 as intake ports of the embodiment,
The junctions of the first and second intake passages correspond to the second junctions 51 and 55,
The junctions of the intake passages of the front and rear working chambers correspond to the first junction 21,
The first on-off valve corresponds to the shutter valve 60,
The third intake port corresponds to the auxiliary ports 37 and 42,
The second on-off valve corresponds to the auxiliary port valves 40 and 45,
The interlocking means corresponds to the rack member 70 and the pinion 72, or the main link 84 and the arm 85,
The single driving means corresponds to the motor 73,
The present invention is not limited only to the configuration of the above embodiment.
[0058]
【The invention's effect】
According to the present invention, the communication path that connects the intake passages of the front and rear working chambers between the junction of the upstream of the first intake passage and the second intake passage and the joining part of the intake passages of the front and rear working chambers. And communication control means for shutting off and opening the communication passage in accordance with the operation state of the engine, so that the curvature of the first intake passage is increased to extend the intake passage in one direction as much as possible to reduce the intake resistance. However, by providing a communication path and communication control means between the junction of the first and second intake passages and the junction of the intake passages of the front and rear working chambers, the pulsation effect (intake of intake air) can be reduced. (Improvement of efficiency).
[Brief description of the drawings]
FIG. 1 is a side view of a rotary engine provided with an intake device of the present invention.
FIG. 2 is a plan view showing an intake system.
FIG. 3 is a system diagram showing an intake device of the rotary engine.
FIG. 4 is an enlarged view of a main part of FIG. 1;
FIG. 5 is a plan view showing a cross section of a second junction.
FIG. 6 is a perspective view of a shutter valve.
FIG. 7 is a bottom view of the intake manifold.
FIG. 8 is an explanatory view showing an interlocking structure for driving an auxiliary port valve.
FIG. 9 is an explanatory diagram at the time of driving.
FIG. 10 is a control circuit block diagram.
FIG. 11 is a characteristic diagram showing a change in engine output with respect to the engine speed.
FIG. 12 is an explanatory view showing another embodiment of an interlocking structure for driving an auxiliary port valve.
[Explanation of symbols]
21: First merging section (merging section)
31 ... working chambers 34, 35, 36, 41 ... intake ports (intake ports)
37, 42 ... Auxiliary ports (third inlet)
40, 45 ... Auxiliary port valve (second on-off valve)
49, 53 ... first intake passages 50, 54 ... second intake passages 51, 55 ... second junction (junction)
52, 56 third intake passage 57 communication path 58 VDI valve 59 communication control means 60 shutter valves 70 and 72 interlocking means 73 motor (drive means)
84, 85 ... interlocking means

Claims (3)

Two working chambers each having two intake ports, each of which is connected to the first and second intake passages,
The first intake passage and the second intake passage of each of the working chambers are joined upstream to form a junction,
A communication path for communicating the intake passages of the front and rear working chambers between the junction and the junction of the intake passages for the front and rear working chambers, and a communication control means for shutting off and opening the communication passage according to the operating state of the engine An intake device for a rotary engine comprising: A first on-off valve for opening and closing the second intake passage in accordance with an operating state of the engine,
Each of the working chambers is provided with a third intake port and a third intake passage communicating with the intake port,
2. The intake device for a rotary engine according to claim 1, further comprising a second on-off valve that opens and closes the third intake passage according to an operation state of the engine. In a rotary engine having a two-rotor structure, the two second on-off valves are interlocked with each other by interlocking means,
3. The intake device for a rotary engine according to claim 2, wherein said interlocking means is driven by a single driving means.

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