JPS59105934A - Intake apparatus for rotary piston engine - Google Patents

Abstract

PURPOSE:To increase the output of an engine, by raising the charging efficiency over the operational range of the engine from its medium-speed operation to high-speed operation by communicating either of low-load intake passages or high-load intake passages of each cylinder with each other on the downstream side of a throttle valve, and forming an expansion chamber on the downstream side of a throttle valve disposed in the other intake passages. CONSTITUTION:A branched portion of a main high-load intake passage 21 constitutes an expansion chamber or an enlarged chamber 26 having a connecting passage 25 on the downstream side of a high-load throttle valve 23 for communicating a first high-load intake passage 21a and a second high-load intake passage 21b with each other, while a branched portion of a main low-load intake passage 20 constitutes an enlarged chamber 28 having a connecting passage 27 for communicating a first low-load intake passage 20a and a second low-load intake passage 20b with each other on the downstream side of a low-load throttle valve 22. The volume of the enlarged chamber 28 is selected to be 0.5-2 times as large as the piston displacement of an engine. If it is smaller than one half of the piston displacement of the engine, the effect for inverting expansion wave to compression wave or vice versa cannot be obtained. On the other hand, if the volume of the chamber 28 is greater than the double of the piston displacement of the engine, the effect of natural pulsation of intake air is reduced remarkably since dispersion of compression wave is caused. Thus, since the enlarged chambers 26, 28 function as surge tanks at the time of transient operation such as acceleration or deceleration of an engine, it is enabled to obtain a good response of fuel.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an intake system for a low-repetition piston engine, and more specifically, the present invention relates to an intake system for a low-repetition piston engine, and more specifically, a side intake bow type two-cylinder engine having two independent intake passages, one for low load and one for high load. In a rotary rev engine, the intake pressure wave generated in the intake passage is used to create a supercharging effect from the mid- to high-speed range of the engine. .

In general, these two systems of side intake bow 1 to type 2
A cylinder rotary piston engine consists of a rotor housing having a two-section trochoidal inner peripheral surface and side housings located on both sides of the rotor housing. It is supported on the lentic shaft 1 and the rotation angle of the shaft is 180.
A low-load intake passage and a high-load throttle valve that rotate planetarily with a phase difference of ° and are equipped with a low-load throttle valve
The high-load intake passage d5 is located downstream of the low-load throttle valve and opens into the working chamber through low-load and high-angle intake boats independently provided in each of the reed housings. CJ between solid cylinders: 180°
1 (11) of the rotor in each cylinder while maintaining the phase difference of
As the engine rotates, the intake, compression, explosion, expansion J5, and exhaust strokes are performed in sequence. When the load of the So-01 engine is low, only the above-mentioned low-load throttle valve is opened to supply intake air only from the low-load intake passage, which has a narrow passage area, thereby increasing the intake flow rate and improving combustion stability. While improving
When the engine is under high load, the high-load throttle valve is also opened to supply intake air from the high-load intake passage, thereby increasing filling efficiency and increasing output. This is a so-called dual induction method. In addition to the model in which the above-mentioned low-load throttle valve is installed in the low-load intake passage, there is also a model in which the low-load throttle valve is installed upstream of the branch between the low-load intake passage and the high (, ', + 7 IJ intake passage). Shinoshikai is coming.

By the way, conventionally, in this J: Eel low-return piston engine, a supercharger was installed in the intake passage to supercharge the intake air. It is well known that supercharging (supercharging) is required, so f! t; There was a fear that the announcement would be loud and loud and the loss would be 1~up.

J: Conventionally, as disclosed in Japanese Utility Model Application No. 45 2321, a technology has been used to increase the supercharging effect using intake pressure waves. The pipe is divided into two passages with different dimensions, each with a separate intake boat, and when the engine is running at high speeds, two intake passages are used, and when the engine is running at low speeds, the intake passage with the slower closing position is closed. By blocking the intake air early, it is suitable over a wide range of engine speeds by utilizing the supercharging effect caused by the intake air blockage at the maximum pressure of the intake air, which is a function of the intake pipe control and engine speed. A system has been proposed that achieves a high filling efficiency. But this one is
It is designed for a 12-cylinder low revitalization engine, and it is unclear how it will utilize the intake pressure waves generated in the intake passage, so it will not be put into practical use immediately. It was something that didn't exist. Moreover, since the peripheral bow 1~ is used as the intake bow 1~, the intake bow 1~ will communicate with the exhaust working chamber before the intake working chamber closes, and the exhaust gas will be blown back from the exhaust working chamber. It was difficult to obtain the effect of the supply. In particular, in recent years on the market, cone engine exhaust pressure has increased to reduce noise and purify exhaust gas, and at high speeds and loads, normal engines can reach around 400 to 600 mTnHg (gauge 11), and engines with turbochargers. If it exceeds 1,000,100 O, it is assumed that no improvement in filling efficiency can be expected by the above-mentioned peripheral bow method.

fThus, the present inventors studied the intake characteristics of the side intake port in a rotary piston engine and found that (i) When the intake port is closed, the intake air is compressed due to the inertia of the intake air, and the intake air in the intake passage is compressed. It was found that a compression wave was generated in the bow 1 ~ part, and that an expansion wave was generated in the intake passage due to the intake sensation of (1;) intake bow) ~.From this, it was found that the above If the /-iE contraction wave at the time of (1) closing is applied to the intake bow i of the other cylinder, especially just before full opening, where intake air blowback occurs, the supercharging effect can be effectively achieved (hereinafter referred to as intake air (referred to as inertia effect), and if the expansion wave (ii) above in each cylinder is reversed into a compression wave and acts on the intake boat just before full opening of the air conditioner 1, the supercharging effect can be reduced. (hereinafter referred to as the "inhalation individual right pulse effect").

And, as mentioned above, there are 2 lead-id intake boat type 2 systems.
In the cylinder rotary piston engine d''3, in order to obtain the intake inertia effect d3 and the intake unique pulsation effect,
By creating two separate intake passages for high-load and low-load guns, each of the above effects can be effectively achieved in each intake system.゜In addition, unlike the side intake boat type, in the case of the peripheral intake bow 1 type in which the intake passage is located in the rotor housing, the intake bow °1 ~ is always located in the working chamber. Therefore, the above effects are not the same as 4I.

In other words, an object of the present invention is to provide a side intake boat type two-cylinder rotary vis 1 engine with 12 systems as described above, in which each cylinder is The position of the communication passage that communicates one of the intake passages for high angle motion or low load, the position of the expansion chamber for reversing the expansion wave generated in the other intake passage into a compression wave, and the Passage between cylinder intake boats 1.
By appropriately setting the length of the passage from the risa d3 and the expansion chamber to the intake bow 1, it is possible to
At high engine speeds of 0 to 7000 ppm, the supercharging effect can be obtained due to the intake inertia effect in one intake system DC.
;=, On the lower rotation side, the supercharging effect is obtained due to the unique pulsation effect of the intake air in the other intake system, and therefore it can be easily achieved by making slight design changes to the existing intake system without using low supercharging etc. With this configuration, the -C charging efficiency is increased from the engine's medium engine speed to the high rotation range, and the C output direction is effectively achieved.

In order to achieve this objective, the inner peripheral surface of the 4+, r, or 2-section 1-locoid of the present invention is placed on both sides of the rotor housing on the right side. Four approximately triangular D-Yu are arranged in the casing formed by the Idhausink, and the
(This is supported, and the rotation angle of the shirt 1- moves into a planetary rotation 1 (with a phase difference of 180 degrees, and the intake passage for load and the intake passage for high load 2 air H151: I-crivis 1~ which is opened to the working chamber by the low angle and high load intake bow 1~ provided in the housing.
I am in the engine A3, and the frontage period of the high-load intake ball l- is 19s. The rotation angle of the electric trick shaft should be set within the range of 270 to 320 degrees, 1) The period θp of the low-load intake boat should be set within the range of 230 to 290 degrees (1) with the rotation angle of the electric trick shaft.
C0. One of the low-load and high-load intake passages of each cylinder should be connected through a communication passage downstream of the throttle valve. d. The intake passage of each cylinder should be set within the throttle II-flow of the capacity of each cylinder. Providing an enlarged chamber, C1 J is formed in the above-mentioned communication passage d3 and its one-flow intake passage.A passage length l-3 between the intake bow 1 and the solid cylinder is formed.
(One is set between 5000 and 7000rI) When the engine is running at high speed, one of the stun intake bows 1 and 1 and closed D [
(li) Setting is made so that the compression wave generated in the intake passage is propagated through the communication passage to the intake bow 1~ of the other cylinder just before full opening; f. from the expansion chamber; Passage length of the intake passage from intake bow I to each cylinder 91]
(s) at r g between 5000 and 7000 rpHI above.
i determined rotation 29. J, Rimo 100 Q When the engine rotates at 3500 to 50001' p Ill on the low rotation side above rpm, the expansion wave generated in the intake passage by the intake air 511 of the intake boat of each cylinder is reversed in the expansion chamber. By setting the secondary pulsating wave of the compression wave reflected by the cylinder to avoid propagation to the intake bow 1~ of each cylinder just before full opening, the low angle 6.1 and High f'', J I1jl The L'' propagated to the intake bow 1~ by the wave contraction makes the supercharging ?1, so that one intake system is connected to the engine and the [see 1 person 114 1 stage (shown) on the living floor J: and on the other intake system
＞+; engine mid-rotation・mu1)・) intake individual right pulsation effect Song from engine mid-rotation 1i7 (5 times 1pmuj 1) (this effectively increases filling efficiency-2) ：Yes, there is something wrong.

Here, in J-3, one intake system has an i pumping effect of 11, which is 5000 to 7 at high engine speed.
000 rl)m's ↓A semi-rotation INh is generally limited when the maximum output d5 and maximum speed are set within this range (-(
This is due to the fact that the engine's high load, high rotation range requires high output, and is an effective area for improving charging efficiency and output. j, 3500 to 500 when the engine is running at mid-speed when the intake system uses external power to create a unique pulsation effect on the intake air.
The setting of the number of rotations N9 at 0 rpm is because the maximum torque is generally set in this rotation range, it is difficult to obtain the intake pulsation effect in the low rotation range, and the intake inertia effect at the above reference rotation speed Nh. 111 fund, its effect (supercharging effect) (
, 1st base 1-11-rotation speed N IT is 1000' more than toj1):'
0 +゛pm or more on the low rotation side (N 9 ≦N h -10
00rp111) -C" It depends on -C to improve the intake-specific pulsation effect or to improve the overall output.

J, t, above setting” high angle in j term a? + & intake bow 1
- The opening period O5 of 320°, which is the upper limit, is set to 320°, which is the upper limit of 320°, in order to prevent communication between the preceding operation dormitory and the connecting room fjj through the lead air intake boat. During this period, the opening distance between the side seals will be approximately 40 degrees smaller, and it is necessary to provide an interval of 40 degrees or more between them to avoid the overlap during this lead seal opening period, so it is less than this. [;1] By suppressing the gap, a minute gap (usually about 200μ) is created between the sliding surface inside the lead housing on the outside of the lead seal and the side surface of the rotor.
This prevents communication between the intake working chamber and the following exhaust working chamber through the t(1゛TJ'
D C) to bottom dead center <131 C) Fl, Geometric 4. - There is an interval of 1 (ilj) at the beginning of the intake stroke, 11!
In order to do this in the Song dynasty, it is necessary to set ((), at least set the Ming period in II Ming period from now on).

At this height) when setting the opening/opening timing of the front intake bow 1. L, l1il li:'i! ! IF wo upper/E Point J: ',') 'b, mata, 1σ when closed' from bottom dead center) 1. What is the lid requirement? This is due to the fact that the effect of the geometrical intake stroke shifts to which side due to the li''l nature of the intake air amount, , side intake port (- (other lid Il, +i!! If you move the II to the top dead center side) ~ the rotation side tip of the seal falls into the port, so - L death +::j i, *This is because the IJ should not be set after about 30'.

On the other hand, 2. Since the intake bow 1 for low angle 71η mainly has a low rotation range where the amount of intake air is small and the inertia is small,
While closing lυ] to approximately 50° before bottom dead center to prevent intake air from blowing back, at least that opening! ! I] 230° between
It is necessary to ensure the necessary intake air by going through the above steps. Therefore, the opening period 01) of the low-load intake bow 1 is set to 230 to 290 degrees (setting item 1).

In addition, the high load J3 of the present invention and the low load intake bow 1~
The I) 110 period is a substantial gap between the intake bows 1 and 111 on the side surface of the rotor, and is not caused by the lead seal. This is due to the small gap (4 f) on the outside of the 1-side seal that has no substantial effect on the generation and propagation of effective pressure waves in the medium and high rotation range, which is the problem of the present invention. Also, the communication path J5 J:σ at the above setting 1j″jC (Jj term [1 downstream of the throttle valve el i of the expansion chamber;
The purpose of the Ω constant is to avoid the presence of the high-angle J1 river J5 and the throttle valve that controls the air flow in the low-load intake passage, which creates resistance to the propagation of pressure waves. This is to reduce the attenuation and propagate the I1 effect.

Roughly speaking, the passage length l-3 (r) between the intake ports 1 and 1 of the solid cylinder of one intake system in the above setting e is the reference rotation set within the engine speed range of 5000 to 7000 rpm. At several Nh, the intake inertia effect is reduced to 11
J, set to 12 things~C1L,S (P
) = < 18 (tsu -01) x (60/36
ONb ) xa - (J )'s friend is shushing her/
This is ``1. That is,'' 2 (], ) 3
'Cd3,'180° is the phase difference of the inner cylinder,
Also, when θ0 (J, open to the intake boat), the compression wave is at the top lj:
In order to effectively supercharge the period from when it occurs to full opening, the closed compression wave is transmitted (t)li to the intake bow (
-Total (31) ir16g (7) rib Jio
+3 e fVJ, -1 teno ii! l (75 and 1: I' and invalid 1υ) is θo-20',
Therefore, (180-θO) iJI - Closing in one cylinder [1, Required from compression wave generation to propagation to intake bow 1 of the other cylinder - [kisen l ~ ricsi ■・) 1 ~
represents the rotation angle of 7J', and Nh = 5000
to 7000rph+ 7:Yes, 60/360N
h represents the number of seconds required to rotate 1 degree.

In addition, a is the propagation speed of the pressure wave (sonic speed), which is 20℃
and a -343'm/s.

Furthermore, the passage length between the enlargement point in the above setting f and the intake port of each cylinder 9. l) (s) (,:J,
Engine speed is high, □Pi (1 - speed N11 (5)
000~7000ppm) than '1000r p I
More than n! (GQ is determined to effectively reduce the secondary intake J pulsation effect at 3.500 ~ ○QQ rpm on the rotation side, so 9 rl (S) = (θl)
(S)-01)X (60/36ON intersection) 'J nawachi, above (II
) in the formula, low. ] Cargo handling intake -1- bl1 opening IjjlθI) = 230 to 290°, high load intake boat opening u11θs = 270 to 320'', θ1
is the period from intake bow 1 to i'jl1 until the expansion wave is substantially pulled out from the opening, and the intake air which propagates the secondary pulsating wave of the compression wave which is the inversion of the expansion wave in order to effectively perform supercharging. This is the invalid period that combines the period immediately before the boat closes until the boat is fully opened, and is θ+-100', so (0p<s)
-θ1) represents the rotation angle of the eccentric shaft required from the generation of the expansion wave to the propagation of the secondary pulsating wave of the compression wave. Also, engine speed NR=3500~5000rp
m r, 60/36ON9 represents the time (seconds) required to rotate 1 degree, -931, and the pressure wave propagation speed 1ffa = 3 / I 3 m / 5 (20 ° C -
(). Roughly speaking, 1/4 is the second-order 1 of the j11 k dynamic wave.
Since it uses 11 pl movement, there are 2 secondary pulsations (S!
Express the reciprocal of the process.

Here, in the present invention (1j, suction 2 (side stone 111i)
<Reasons for using second-order 1ii reno when calculating H'l motion effect (,1, '1st-order pulsation is the opposite m1, where the above effect is human)
Brave h: 81 (sa') p (S) is long, 2
Pickpocketing in case of next pulsation 2? 3 is too long to be mounted on a vehicle, and also has an fψ tendency that increases intake resistance. On the other hand, 3rd 11iit! l'JJ Ij, passage length 91
) (:;) lfi For the second pulsation, y□(j is 4), but for the second pulsation, the above effect is about 15 to 25% less (-d). J, 1.: The intake resistance is the same as J, which is low.From this, in order to make the passage length Ul) (S) as short as possible to effectively exert the unique intake pulsation effect. It is.

Note that in the above equations (I) and (IT), the influence of the flow of intake air on the propagation of the pressure J wave is ignored.

This is because the flow velocity is smaller than the speed of sound, and the length of the intake passage hardly changes.1 The present invention will now be described in detail with reference to the embodiments shown in the drawings.

1st (ZJ +1') J: hiFig. The first and second cylinders connected to the engine, each cylinder 1△.

1B is 21 each! i5 Toro = 1 id-shaped inner peripheral surface; 2a
The rotor housing 2 is located on the right side of the rotor housing 2, and the intake ports 3 and 3 for the low-mounted rotor 1 are located on both sides of the rotor housing 2 and have low-load intake passages 20a, 20b and high-load intake passages 21a, 211), which will be described later, respectively. A substantially triangular rotor 7 is supported by a single eccentric shaft 8 in a casing 6 formed by a relay 1 and a housing 5, which is provided with intake bows 1 to 1 for high loads. At the beginning, the rotors 7.7 of each cylinder 1A, IB have a phase difference of 180° in the rotation angle of the eccentric shaft 8, and as the rotors 7 rotate, the inside of the casing 6 is divided into three working chambers 9, 7.
9.9, and in each cylinder 1A, 1B, the above 18O''
I% light exposure, expansion j3J: σIJI ki steps are performed in sequence (゛.In addition, 10(J Aikit, 'l 1△, 1[
3 to J3 - (' 1.1-Kuhousink 2 (This was set up 1J1 Kan, Elementary - 1 ~, 11 OJ: Hi 12 is Lee T-ing side J3 and 1 ~ Lelyshik side Lij fire plaque,
7. On the side of the 13-piece loaf 7. Tanisarari・Idshiru,
1 = 1 Apex seal on top of each i5i Roke 7, 15 let ml -9717) B
Top 8i! Both m'! There is a corner seal 'C' that has been 'ta'ed.

Upper 1 side housing 5, 5 facing (low-load J: > J: high-load intake boat 3,
4 is 1' Ai by the side surface of the rotor 7, and the opening of the load intake boat 4 to 1 is θs. and the frontage period θp of intake bow 1-3 for low load
is set in the range of 230 to 290°.

In addition, the opening timing of intake bows 1 to 4 for high loads is set earlier than the opening timing of intake bows 1 to 3 for low loads, so that the JJI air scum from the working chamber 9 can be blown back under high loads. By concentrating it on the side of the intake boat 4 for use, a strong expansion wave is generated at the intake boat 1 to 3 for the low knee load, thereby reducing the strong stone pulsation effect on the intake side. 'Near I'i'i?+: i river intake -1-/I closed [ko11.1 friend, Jl (f, (load intake bow 1~
If the closing time of 3 is the same? 1ilJ-like l;1
119 fixed like g4j? are doing.

-Bus J and 1G have one end connected through air cleaner 17'i-(
The main intake passage opens to the atmosphere and supplies intake air to the solid cylinders 1Δ, 1B, and the main intake passage 1G is provided with a near flow meter 1B that detects the amount of intake air. . The main intake passage '16 is partitioned into a main low-load intake passage 20 and a main high-load intake passage 21 by a partition wall 11) downstream of the meter 18, and the main low-load intake passage 20 includes: The engine opens as the engine load increases and opens fully when the load exceeds a predetermined Q load.However, 1:'a
? -: Low load throttle valve 2 that controls the amount of intake air at time i
2 is arranged in the main high-load intake passage 21,
Opens when the engine load exceeds the specified load! ji~・
A high-load throttle valve 23 is provided to control the amount of intake air when the engine is under high load. Furthermore, is the main low load 1st grain) D) road 20 similar to the above? I-load aperture block'i゛22-1・
In the flow, 1i) l-shape/j-method 1a'3 and 2nd
The low-load intake passages 20a, 201) are connected to the working chamber 99 through the low-load intake bows 1 to 3, 3 of each cylinder IA and IB. The intake passage 21 for high-angle A (η is high-angle A +: the first and second high-angle intake passages 21τ of the same shape N method downstream of the throttle valve 23 for i.
1, 21+) are connected to the working chamber 9.9 through the high-load intake bows 1 to /I, 4 of each cylinder 1△, 1[3, so that each cylinder 1A, 1B In contrast, the low-load intake passages 20a, 201) and the high-load intake passages 21
a and 21b are low-load throttle valves 221;

- Each height <Q f & small passage of intake passages 21a, 21b for grapes
), and the passage length ps of each high-load intake passage 21a, 21b is the same as that of each low-load intake passage 20a.

201) is shorter than the path length 9p < (Qs <Up
) is set to J5, high load intake passage 2ia, 21
1) Inhalation (<'I effect of compression waves in the Song Jiii
This is done effectively by reducing the attenuation.

In addition, upper 51: Each intake passage 20a, 2Qb has a 1t-1VG valve type fuel whose fuel injection amount is controlled according to the output (intake air amount) of the air flow make 18. The first NR4 injection nozzle 24, 271 is arranged -
(There is.

Is the branch part of the main high-load intake passage 21 at a high angle?
Located downstream of the i& throttle valve 23, a communication passage 25 that communicates the first high-load intake passage 21a and the second high-load intake passage 211 is configured by an enlarged graduation 26 on the right. has been done. The passage area △CS of the above-mentioned communication passage 25) is set so that the compression wave 1 due to the intake inertia effect is effectively transmitted by reducing the width of the pressure wave. Equal to or greater than the minimum passage area As of the intake passages 21a, 21b (
ΔCS≧AS> is set.

Similarly, the branch part of the main low-load intake passage 20 is located downstream of the low-load throttle valve 22, and is connected to the first low-load intake passage 20a and the second low-load intake passage 20a. Intake passage 20b
A communication path 27 communicating with the VFi is formed by an enlarged chamber 28 of +111. The volume of the expansion chamber 28 is equal to 1 air volume of engine J (1 (1 - bleed air volume of working chamber x 2)
The inversion effect between the expansion wave and the compression wave is not 1!7 at 0°511°1 tree (lδ1), and on the other hand, 2 (i: If i exceeds i, the pressure wave will diffuse and the unique pulsation effect of the intake will be reduced by 2.
It functions as a glue tank during transient rotations such as during acceleration of the engine or at speeds of 1.1 to 6.28, ensuring good twisting properties.

Furthermore, the high load intake ports 1 to 1 of the solid cylinders 1A and IB are
4. /I [S is the passage length 9 of the communication passage 25
cs and the first downstream of the communication path 25. Each passage length US of the second high-angle load intake passages 21a and 21b.

9S), 5000~7000rptn (D range fffl
(7) W tlj The above (I
> From the formula, Ls = 1.31 to 1.83 (T11) In addition, the above 1. Second low load intake passage 20a, 2. O
b passage length 9p, that is, each low angle intake passage 20a
, 20b's expansion chamber 28'\]' Frontage from the end face to the operating seedling 9 (low 1'ji A intake bows 1 to 3) -7000rp
Reference rotation % within the range of il 1000 than N h
rpm 3500 to 50001' on the low rotation side 1
) From the above formula <n>, Lp is determined to be Lp = 0.37 to 0.78 (m) based on the engine intermediate rotation M at the rotation speed N9 within the range of III.

In Fig. 2, 29 is an exhaust passage connected to the III cylinders 1 to 10, and 30 is a Jllll exhaust passage that assists a catalyst device (not shown) interposed in the middle of the exhaust passage 29. This is an enlarged manual.

Next, the operation of the above embodiment will be explained as shown in FIG.
When the engine is under high load, the high load throttle valve 23 is opened. The second high-load intake passages 21a and 21b are opened, and the high-angle I/JI first-stage cylinders 1. Bow 1-/I, <Garamo low angle suction・, Bow 1-3.33
Intake air is supplied independently from the 11. High engine speed of 5,000 to 7,000 rpm that requires high output.
1 [-t high f) Song intake port 1-41 For male verse, intake 1', l t! The intake air is compressed by the high-load intake ports 1 to 1 in the second high-angle intake passages 211 for
A compression wave occurs at the time of closing 10 in the 1 part 3. This compression wave at the time of closing occurs in the high load intake bow 1~= of the solid cylinders 1A and 1B.
1. , <The path length between l-s is 5000 to 7000 above.
The above is based on the engine high time of rpn+ 117 o'clock.
By setting i-s=L, 31 to 1.83 m according to the formula (2), the second high-load intake passage 21b'il passage 2
5→The first high-load intake passage 21a is propagated to the high-load intake bow 1 to /I just before full opening of the first cylinder 1A, which has a phase difference of 180°. As a result, due to this compression wave at the time of closing, the intake air is forced into the working air 9 by the high-load intake boat 3 just before the first cylinder 1A is fully opened, and supercharging is performed. Similarly, in the second cylinder 1B, λJ'(-first cylinder 1△
The supercharging effect is increased by 1!1 due to the propagation of the opening (1, pressure 1.1' wave) from the

On the other hand, due to base semi-rotation of 5000 to 70001-11 m, N h , J: Rimo 11000 rp or more, 35 on the low rotation side.
00~5000r l] nl engine medium rotation 0, r
tJ, each air heel) 1Δ, 1B, the 1st. Expansion waves are generated in the second low negative A/row suction (passages 20a and 2Qb), and this expansion wave extends over the passage length 91 between the low load suction bows 1 to 3 and the expansion chamber 28. ) to 0.37 to 0°7 using the above formula (■)
I set it to 81η. Negative '12 Low load 1st air passage 20a, 2Qb → Expansion chamber 28 (step change to compression wave and foul) → 1st. Second low negative intake passage 20a, 2
0b->low-load intake boat 3 (reverses to expansion wave and reflects 2->1st. Second low-load intake passages 20a, 20b->expansion chamber 28 (reverses to compression wave and reverses 9A)->1st. Via the second low-load intake passage 208.20b, it propagates as a secondary pulsating wave of the compression wave to the low-load intake boat 3 just before each cylinder 1A, IB is fully opened, and supercharging is performed.

(Nol; In the past, there was a d5 gap between cylinders 1△ and 'IB. 1A for each cylinder.

1 [J3 on 3 itself] - Low angle 'lI during resin medium rotation
The supercharging effect due to the intake air pulsation effect of the simulated air system-C for l is as shown in Fig. 4, and as shown in FIG. It is possible to decrease the output due to the increase in the 1st effect.
Yu, Aiki C:) 1Δ, 1[3's low 'i'3 Idj 7
11 a3 and high load intake passage 20F1.201)
, 218.2'lb are each independent (indicated by the broken line).
1. 1. Lower OOO rpm to J, t f-%. j
The i intake system has a secondary intake full pulsating effect of 1! ? The figure shows the output torque characteristics of the engine in A3 in the case of the example of the present invention (indicated by the solid line).

In that case, especially the high-load intake passage 21a.

21b has a larger passage area than the low-load intake passages 20a and 20b, and has a shorter passage length, so E
L: The resistance to the propagation of the force (compression wave) is small, and the light 1; 1?
You can make noise.

J, T, The communication passage 25 is located downstream of the high-load stem valve 23, and L/IJ' is also the same as the passage area AC of the communication passage 25.
Since S is made equal to or larger than the 1μ small passage area A S of the surface load intake passages 21a and 21b, the −1 force wave is reduced due to the high angle load calibration valve 23 and the white of the communication passage 25. Intake inertia effect 4 without taking effect on light Jrff T
'Monkey. In addition, the expansion chamber 28 is
Since the intake air is positioned two downstream, similarly, the unique pulsation effect of the intake air can be effectively exerted.

Roughly speaking, is the opening timing of intake bow 1 to 4 for high load mentioned above at a low angle? By making the intake bow for 1 to 1 earlier than 1 to 3,
Since the blowback of the IJ1 air gas is concentrated on the high-load intake bows 1 to 4, expansion waves, that is, secondary pulsating compression waves, can be strongly generated at the low-load intake bows I to 3, and the above-mentioned The supercharging effect due to the intake-specific pulsation effect can be made even stronger.

J, the supercharging effect due to the above-mentioned intake inertia effect a3 and intake individual pulsation effect is 1'; i! []flI! Bilθ[
], θS, first high negative I:jIll suck (passage?-)d
and the second high girl A, B;
” +iB, +j82 b's 0'4 position and 1st generation construction 4: j i'i] Eve of the expansion chamber 28 of the intake passage 20a+ 201+!
B height s” AI; 1 for intake bow 1 to 4° 1 passage
By setting the passage length 2p between the length 2ε3 and the load intake bows 1 and 3 as J-i!8) 1. C4'J and supercharged τ
Since it does not require 5Ω, the existing intake system's 1I/Kana 9Ωi
] Change C゛ Already completed, t/'S 3 Notice is extremely simple -
C, so it can be implemented easily and inexpensively.

It should be noted that the present invention includes: 1 [) Examples (I 1 is not limited to this, and also includes various other modifications) 3
For example (J1), unlike the above embodiment, the intake inertia effect at high engine speeds is applied to the low-load intake system;
1. Intake system for ~ j pulsation effect e high angle i ■ u intake system r
i! Of course, it is also possible to do so.

In addition, setting the intake/exhaust overlap period to 1 m in the rotation angle of O to 20' to the eccentric shirt 1 improves the filling efficiency and reduces the amount of carry-in. Especially if the engine is placed low*? ＋l
1- (preferable) to prevent l'l misfire.

In the above embodiment, the low-load throttle valve 22 was installed in the main low-load intake passage 20, but the low-load throttle valve 22 was installed in the main low-load intake passage. A type provided in the main intake passage 16 of the flow between the main intake passage 20 and the main load intake passage 21 is also possible.

As explained above, according to the present invention, a lead intake bow 1~ type 2 air 1:) low re-piston engine equipped with two independent intake passages, one for low load and one for high angle Iro 7: When the engine speed of I T, 5000-700Q rpIII is high, one intake system is connected to the cylinder for J.
The intake inertia effect for 7 hours (with the supercharging effect being taken into consideration)
This is 350Qrpm, which is 11000p or more lower than the reference rotation speed of 5000 to 7000r111T+ above.
When the engine is running at ~5000 rl]m, the supercharging effect is obtained by the pulsation of the intake air in each cylinder in the air intake system, so there is no need for a supercharger, etc.
Due to the modification of the existing intake system (5), the f! This makes it possible to effectively improve the output of low-revise engines, making it easy to implement measures to improve output and reducing costs.
A'c' can be achieved.

[Brief explanation of the drawing]

Drawings (J) Showing an embodiment of the present invention, Fig. 1 is an overall tM construction explanatory diagram, Fig. 2 is an overall +11i% schematic sectional view, and Fig. 3 is an explanatory diagram showing the intake stroke of the first and second cylinders. , FIG. 4 is a graph showing the output torque characteristics according to the present invention. 1Δ...first cylinder, 1B...second cylinder, 2...1
Coke housing, 2a... 2 i tower ~ lochoidal inner circumferential surface, 3... low load intake bow 1 ~. 4...Intake bow for high load 1-15...Side housing, 6...
・Casing, 7... Rotor, 8... Eccentric left, 9... Operation release, 16... Main intake passage, 20... Main low load intake passage, 20a... 1st Low-load intake passage, 20b...second low-load intake passage,
21... Main high-load intake passage, 21a... First high-load intake passage, 211]... Second high-load intake passage,
22... Throttle valve for low angle bending, 23... Throttle valve for high angle bending, 25... Communication path, 28... Expansion chamber.

Claims (1)

[Claims] (1) Approximately triangular rotors each disposed within a casing formed by a rotor housing with a locoidal inner peripheral surface on the right and υ-oid housings arranged on both sides of the rotor housing. is supported by the eccentric shirt l~ and rotates planetarily with a phase difference of -°C 180°, and the low-load intake passage and the high-load intake passage are independently connected to each side housing. The low load and high load intake boats installed in the
In the J3 cylinder rotary piston engine, a. Setting the opening period of the high-load intake bow 1 to a range of 270 to 320 degrees at the rotation angle of the rick shaft, b. Opening of the low-load intake boat setting the period in the range of 230 to 290° in rotation angle to the eccentric shirt 1; communicating one of the low load and high angle 6S1 intake passages of each cylinder C1 with a 3qi passage downstream of the throttle valve; d. An enlarged chamber is provided downstream of the throttle valve in the other intake passage of each cylinder; 5000
~7000 rllm"c F=2 When the engine is running at a constant high speed, the overlapping compression wave generated in the intake passage when the intake bow mill of one cylinder is closed is transmitted to the intake bow of the other cylinder just before opening via the communication passage. f. The length of the intake passage from the expansion chamber to the intake boat of each cylinder is set to 10 o o rpm or more above the rotation speed set between 5000 and 7000 ppm. When the engine rotates at 3500-5000 rpm+ on the low rotation side, the expansion polarized wave generated in the intake passage due to the start of intake bow 1- of each cylinder is inverted and reflected by the expansion wave 2 of the compression wave.
By setting the next pulsating wave to propagate to the intake boat of each cylinder just before full opening, the compression wave propagated to the low-load and high-load intake boats of each cylinder just before full opening causes overload. The intake system of a low-repetition piston engine that uses I8 to supply air.