Air intake device for multiple cylinder engine

[Detailed Description of the Invention]

(Field of the Invention) The present invention relates to the suction system of a multi-cylinder engine, and relates to the thing the air intake was made to supercharge by the inertia effect and a resonance effect especially. (PRIOR ART) In order to raise engine output torque these days, improving the restoration efficiency of an air intake is performed by supercharging the air intake supplied to an engine cylinder using dynamic effects, such as an inertia effect and a resonance effect. An air intake is set in an engine predetermined rotation region (inertia alignment rotation region), when supercharging according to an inertia effect, When the negative pressure wave of an air intake occurs on an air intake boat with valve opening of an inhalation valve in early stages of the intake stroke of each cylinder, it is made to spread at acoustic velocity toward the upper stream side within the independent intake passage by which this air intake negative pressure wave was connected to the inlet port, and a positive pressure wave is made to reverse this negative pressure wave by a predetermined volume part (volume room). It is made to arrive at the inlet port of the same cylinder as the end of an intake stroke just before it makes this positive pressure wave spread at acoustic velocity to the lower stream side by the same course and an inhalation valve closes the valve, an air intake is stuffed into a combustion chamber by this positive pressure wave, and that restoration efficiency is improved. On the other hand, when supercharging an air intake by a resonance effect, a plurality of engine cylinders are divided for every cylinder used as the regular intervals of an intake stroke, and it group-izes in a plurality of cylinder groups, The independent intake passage of a plurality of cylinders of each of this cylinder group is gathered to one set intake passage (resonance intake passage) by an upstream end, and the pressure reversal part which consists of volume parts is provided in the prescribed position of this set intake passage. And the pressure wave of the air intake which carries out the both-way propagation of between a pressure reversal part and each cylinder by coinciding the phase of the basic pressure wave of the air intake which occurs in the inlet port of each cylinder of a cylinder group, and the reflective pressure wave reversed in the pressure reversal part in an engine resonance alignment rotation region is made to resonate within a set intake passage. The resonance pressure wave which has big amplitude by pressure vibration which occurs separately for every cylinder by this resonance is generated, by this resonance pressure wave, an air intake is stuffed into the combustion chamber of a cylinder, and restoration efficiency is improved. As such a suction system, it is conventionally shown in JP,62-121828,A, While connecting the independent intake passage connected to each of a plurality of cylinders to two capacity rooms in which division formation was carried out by the partition into the surge tank, respectively and making this both capacity room open for free passage by the main intake passage by the one end side of a surge tank, By establishing a free passage way in the above-mentioned partition, and allocating an opening-and-closing valve in the free passage way, the reversal part of a manifold-air-pressure wave is changed by the opening-and-closing change of an opening-and-closing valve, and there are some from which the dynamic effect was acquired in the engine large rotation region. (Object of the Invention) However, the problem of the distribution nature or the dynamic effect of an air intake on each cylinder not becoming uniform since it becomes long in what uses a surge tank like the above with the length to each independent [ of the upper stream side passage in the inside ] intake passage or the cylinder of downstream one end is To make a nose. Then, the upstream end of the independent intake passage of each cylinder group is gathered to the set intake passage prolonged to the cylinder column direction for every cylinder group, It is possible to provide the connection intake passage which connects the downstream ends of each set intake passage with this each set intake passage annularly, and to attain the distribution nature of an air intake and equalization of a dynamic effect to each cylinder, especially the cylinder by the side of the set passage lower stream. While according to this thing propagation of a resonance pressure wave is promoted by the set intake passage which serves as a narrow cross-sectional area as compared with a surge tank and a resonance effect is fully pulled out, miniaturization of an air intake system can be attained by abolition of a surge tank. However, in the thing like the above, if engine number of rotations separates from the resonance alignment number of rotations of a low rpm and shifts to a high rpm, in the bottom, the restoration efficiency of an air intake will arise in the fall of output torque once under the influence of the delay of a resonance pressure wave. Therefore, in the fixed air intake system which not only a resonance effect but an inertia effect produces, When resonance alignment arose in the engine low rpm and inertia alignment arose in the high rpm rather than it, in the above-mentioned inertia alignment number-of-rotations region, an inertia effect could not be expected under the influence of a resonance effect, but there was a fall of torque in the problem that it must have been avoided. It was made in view of this point, and the present invention is the object, While fully demonstrating the resonance effect in a low rpm using the set intake passage connected annularly [ the above ], It is in Fresh(ing) certainly the resonance pressure wave (resonance effect) which is overdue between each set intake passage in an inertia alignment rotation region, establishing last means, controlling the torque fall by a resonance effect, demonstrating satisfactorily the inertia effect at the time of a high velocity revolution, and increasing engine output torque. (Means for solving problem) In order to achieve the above-mentioned object, the solving means of the present invention is premised on two or more group preparation Multi-cylinder engine for the cylinder group which comprised a plurality of cylinders from which each intake stroke serves as regular intervals mutually as a suction system of a multi-cylinder engine. And it gathers to the set intake passage for every cylinder group prolonged to a cylinder column direction in the upstream end of the independent intake passage which is open for free passage in the cylinder of each above-mentioned cylinder group, respectively, and provides the connection intake passage which connects annularly the downstream ends of each of this set intake passage with the set intake passage for every above-mentioned cylinder group. While providing the free passage way which makes the independent intake passages between each cylinder group open for free passage with a bigger cross-sectional area than a course shorter than the free passage course which connects the independent intake passages of a cylinder mutually corresponding in the center of the cylinder column direction of each cylinder group, or the above-mentioned connection intake passage between the set intake passages of each above-mentioned cylinder group furthermore, The free passage of the independent intake passages between each cylinder group is considered as the opening-and-closing To provide valves composition which Open control in an engine inertia alignment rotation region on the free passage way. (OPERATION) By the above-mentioned composition, the upstream end of the independent intake passage of each cylinder group is gathered by the present invention to the set intake passage for every cylinder group prolonged to a cylinder column direction, While providing the connection intake passage which connects annularly the downstream ends of each of this set intake passage with this each set intake passage and attaining equalization of the distribution nature of an air intake and the miniaturization of an air intake system to each cylinder, Propagation of a resonance pressure wave is promoted by the set intake passage which extracted the cross-sectional area narrowly, and the resonance effect is fully made to be demonstrated in an engine low rpm. In that case, the opening-and-closing valve Open control(ed) in an engine inertia alignment rotation region, Since the independent intake passages between each cylinder group are opened for free passage by the free passage way used as a bigger cross-sectional area than a course shorter than the free passage course which connects the independent intake passages of a cylinder mutually corresponding in the center of the cylinder column direction, or a connection intake passage, In the time of an engine high velocity revolution, the inertia alignment which makes this free passage way the reversal part of a manifold-air-pressure wave arises, and it can do [ improving the restoration efficiency of an air intake according to this inertia effect, or ]. Although the torque fall effect tends to arise in this high rpm by the resonance effect which arose according to the free passage course which connects the set intake passage between each cylinder group, Since valve opening of an opening-and-closing valve is open for free passage in a ball free passage way and it is open for free passage in the independent intake passages between cylinder groups, the above-mentioned resonance effect can be inhibited by this free passage, that influence can be lost, and, therefore, an inertia effect can be increased. (EXAMPLE) Hereinafter, the example of the present invention is described based on a drawing. Drawings 1 and 2 show the 1st example of the present invention -- 1 -- the -- the [ 1~] -- the 1st and 2nd one pairs of banks la where it is ■ type 6-cylinder engine which has 6 cylinder 2a~2f of 6, and this engine 1 counters. It has 1b, and 2c, and the 5th cylinder two ethree cylinders are formed in the 1st bank 1a, and 1st cylinder2 a the 3rd cylinder of 2b, 2d of the 4th cylinder, and the 6th cylinder three 2-f cylinders are formed in the 2nd bank 1b, respectively. [ the 2nd cylinder of ] 20-cylinder [2 ] an a~2-f intake stroke -- 1st cylinder 2a-> 6th cylinder 2f - 3rd cylinder 2 cm 2nd cylinder 2b= the 5cylinder2e-> -- an intake stroke advances in 4th cylinder 2 d order. And in this example, 6 cylinder 2a~2f, it is divided into two cylinder groups 3a and 3b every three cylinders so that an intake stroke may become at equal intervals mutually. 4 is the above -- the [ which are an intake passage which supplies an air intake to each cylinder 2a~2f / by which this intake passage 4 was connected to a downstream end or three cylinders 2a, 2c, and 2e of the 1st cylinder group 3a, respectively / three ] -- 1 independent intake passage 5a 5b. 5C and the three 2nd independent intake passages 5d, 5e, and 5f by which the downstream end was connected to three cylinders 2b, 2d, and 2f of the 2nd cylinder group 3b, respectively, It has inlet port 6 of the above-mentioned 1st independent intake passages 5a, 5c, and 5e, the 1st set intake passage 7a connected by the upstream end which serves as isometry from ..., and above-mentioned 2nd independent intake passages [ 5b, 5d, and 5f ] inlet port 6 and the 2nd set intake passage 7b connected by the upstream end which serves as isometry from .. These are arranged above the 1st bank 1a of engine 1, and the upstream end is connected to main intake passage 8, respectively. It is connected to air cleaner 9 and the upstream end of the above-mentioned main intake passage 8 is allocated in air flow meter 10 which detects an inhalation air content in the middle of this main intake passage 8. Each independent intake passage 5a~5f of above 1st and the 2nd cylinder groups 3a and 3b, each cylinder 2a~2f -- inhalation valve f illustration -- not carrying out -- it passes and an upstream end carries out an opening the [ which was formed in engine 1 ] -- 1~6th upper stream side independent intake passage part 11 a~llf, the [ the ] -- the [ which is connected to the downstream end of 1~6th upper stream side independent intake passage part 11 a~llf, and is prolonged in the method of the outside of engine 1 ] -- independent [ 1~6th lower stream side ] -- it consists of intake passage part 12a~12f. In this case, as for 58~5 f of each independent intake passage of the 1st and the 2nd cylinder groups 3a and 3b, Uniformity --ization of the isometric ratio of three independent intake passages 5a, 5c, and 5d (5b, 5e, 5f) in each cylinder group 3a and 3b and air intake flow resistance, etc. are attained by the arrangement structure like Above. the [ of both the above-mentioned cylinder groups 3a and 3b ] -- the 1. 2nd set intake passages 7g and 7b the -- the 3rd [ mutually corresponding in the center of the cylinder column direction of the 1. 2nd cylinder groups 3a and 3b ], and the 4th -- the [ cylinder 2c and 2d / the 3rd and ] -- 4 independent intake passage 5c, free passage course L1 which connects 5d, and the course length which abbreviated-A match carries out -- the -- 7g of the 1. 2nd set intake passages. Connection intake passage 13 which connects the downstream ends of 7b is provided, and the 1st butterfly valve 14 of Always closed which Open control the free passage in the downstream end of both set intake passages 7a and 7b by the midrange rpm of engine 1 is provided in the end part of the connection intake passage 13. In this case, connection intake passage 13 is used by valve opening of the 1st butterfly valve 14 as a volume part by the midrange rpm of engine 1, and a good resonance effect is obtained. the [ and / above-mentioned ] -- the [ mutually corresponding in the center of the cylinder column direction of the 1. 2nd cylinder groups 3a and 3b ] -- 3. the 4 -- the [ cylinder 2c and 2d / the 3rd and ] -- 4 independent intake passage 5c. It is the 3rd and 4th independent intake passage 5c at free passage course L2 in which 5 d is shorter than free passage course L (free passage course by the side of connection intake passage 13) with which the 3rd and 4th independent intake passage 5c and 5d are connected with the 1st and 2nd set intake passages 7a and 7b located, respectively by short distance. Tube diameter X[ bigger / connecting 5d ] than tube diameter X1 of free passage course L1 : It comes out, it has a big cross-sectional area, and the 3rd and 4th independent intake passage 5c and free passage way 15 which connects 5d are connected. and -- the above-mentioned free passage way 15 -- the -- the [ between the 1. 2nd cylinder group 3a and Bb ] -- it is provided in the 2nd butterfly valve 16 (opening-and-closing valve) of Always closed which carries out valve-opening control of the free passage of the 1 * 2nd set intake passage 6 and seven comrades in an engine inertia alignment rotation region (high rpm). therefore, in this example, every cylinder group 3a and 3b are independent -- the [ which is prolonged in an intake passage 5a~5f upstream end to cylinder group 3a and the cylinder column direction for every Bb ] -- gathering the 1 * 2nd set intake passages 7a and 7b -- this each set intake passage 7a and 7b -- each set intake passage 7a. While providing connection intake passage 13 which connects the downstream ends of 7b annularly and attaining equalization of the distribution nature of each air intake to cylinder 2a~2f, and miniaturization of an air intake system, Propagation of a resonance pressure wave is promoted by each set intake passage 7a and 7b which extracted the cross-sectional area narrowly as compared with the surge tank etc., and the resonance effect is fully made to be demonstrated in the low/medium-speed-rotation region of engine 1. in that case, the 2nd butterfly valve 16 opened in the inertia alignment rotation region (high rpm) of engine 1 -- the [ of each cylinder group 3a and 3b ] -- the 1. 2nd set intake passage 7a. the 3rd to which between 7b corresponds mutually in the center of the cylinder column direction of each cylinder group 3a and 3b, and the 4th -- the [ cylinder 2c and 2d / the 3rd and ] -- 4 independent intake passage 5c Free passage course L which connects 5d by short distance]

also depending -- short free passage Path -- coming out and tying -- and tube diameter of free passage course L1 X]

also depending -- since free passage way 15 which has a big cross-sectional area by big tube diameter X2 is open for free passage, in the time of the high velocity revolution of engine 1, the inertia alignment which makes this free passage way 15 the reversal part of a manifold-air-pressure wave arises, and this inertia effect can raise the restoration efficiency of an air intake. this high rpm -- the -- the [ between the 1. 2nd cylinder group 3a and 3b ] -- although the torque fall effect tends to arise by the resonance effect which arose according to free passage course L1 which connects the 1. 2nd set intake passages 7a and 7b free passage way 15 is opened for free passage by valve opening of the 2nd butterfly valve 16 -- the -- since the 1. 2nd cylinder group 3a, and each independent intake passage 5a~5f between 3b are opened for free passage, the above-mentioned resonance effect can be inhibited by this free passage, that influence can be lost, and, therefore, an inertia effect can be increased. As a result, while a high resonance effect can be obtained in the low/medium-speed-rotation region of engine 1, the influence by a resonance effect can be eliminated in a high rpm, and a high inertia effect can be acquired. (Other examples) Drawing 3 shows the 2nd example, in Nephew and each following example, the numerals same about the same portion as each figure of the 1st example are attached, and the detailed explanation changes the free passage way to omit. this example -- the -- the [ mutually corresponding in the center of the cylinder column direction of the 1. 2nd cylinder groups 3a and 3b ] -- 3. the 4 -- cylinder 2c, The 1st and 2nd set intake passage 7a to which the upstream ends of 2 d of the 3rd and 4th independent intake passages 5c and 5d correspond, respectively, The 3rd and 4th independent intake passage 5c and two free passage ways 21.21 which connect 5d are connected to 7b in free passage course L2 shorter than free passage course L1 which connects the 3rd and 4th independent intake passage 5c and 5d by short distance. And total of the cross-sectional area of both Fast passage 21 is free passage course L].

It has set up more greatly than the cross-sectional area of Of pipe diameter X1. moreover -- both above-mentioned Fast passage 21 -- the -- the [ between 1. 2nd cylinder group 3a3b ] -- the 2nd butterfly valve 22.22 (opening-and-closing valve) of Always closed which carries out valve-opening control of the free passage of 1. 2nd set intake passage 6.7 comrades in an engine inertia alignment rotation region is provided. therefore -- this example -- a high rpm -- every -- free passage way 21.21 is opened for free passage by valve opening of the 2nd butterfly valve 22 -- the -- since the 1. 2nd cylinder group 3a, and each independent intake passage 5a~5f between 3b are opened for free passage the [ between the 1st, the 2nd cylinder group 3a, and 3b ] -- the torque fall effect by the resonance effect which arose according to free passage course L1 which connects the 1. 2nd set intake passages 7a and 7b is inhibited, the influence is lost, and an inertia effect can be increased. Also in this example, the same effect as the above-mentioned example can be acquired. Drawing 4 shows the 3rd example and is at this example, the -- the [ of the both-sides end of the cylinder column direction of the 1. 2nd cylinder groups 3a and 3b ] -- 1. the 2 -- cylinder 2a, the [ of 2b / the 1st and ] -- the upstream ends of 2 independent intake passages 5a and 5b, the 5th, and the 6th -- cylinder 2e, The 1st and 2nd set intake passage 7a to which the upstream ends of 2 f of the 5th and 6th independent intake passages 5e and 5f correspond, respectively, Connection intake passage 13 side which connects the 5th and 6th independent intake passage 5e and 5f with 7b by short distance (both set intake passages 7a) The 5th and 6th independent intake passage 5e and two free passage ways 31.31 which connect 5f are connected by free passage course L:! shorter than the 1st free passage course L1 by the side of 7b lower stream, both set intake passages 7a, and the 2nd free passage course L3 by the side of 7b upper stream. And total of the cross-sectional area of both Fast passage 31 has set up to become larger than the cross-sectional area of tube diameter X1 of the 1st free passage course L1. moreover -- both above-mentioned Fast passage 31 -- the -- the [ between the 1. 2nd cylinder group 3a and 3b ] -- the 2nd butterfly valve 32 and 32 of Always closed which carries out valve-opening control of the free passage of 1. 2nd set intake passage 6.7 comrades in an engine inertia alignment rotation region is provided. therefore -- this example -- a high rpm -- every -- valve opening of the 2nd butterfly valve 32 is open for free passage in free passage way 31.31 -- the -- since the 1. 2nd cylinder group 3a, and each independent intake passage 5a~5f between 3b are opened for free passage the 1st -- the [ between the 2nd cylinder group 3a and 3b ] -- free passage course L] which connects the 1. 2nd set intake passages 7a and 7b

The torque fall effect by the resonance effect which was boiled and carried out raw more is inhibited, the influence is lost, and an inertia effect can be increased. Also in this example, the same effect as the above-mentioned example can be acquired. Drawing 5 shows the 4th example and changes connection of the main intake passage 8 to both set intake passages 7a and 7b. namely, -- adding to the composition of the 3rd example of the above in this example -- the both ends of the 1st and 2nd set intake passages 7a and 7b -- the -- the 1. 2nd cylinder group 3a. the 3rd the 4 [ mutually corresponding in the center of the cylinder column direction of 3b ] -- the [ cylinder 2c and 2d / the 3rd and ] -- 4 independent intake passage 5c and connection intake passage 41.41 which connects annularly the 1st and 2nd set intake passages 7a and 7b by the course length which is abbreviated-in agreement in 5d are provided. They are both set intake passages 7a to the end part of connection [ on the other hand / (a figure right-hand side) ] intake passage 41 among this each connection intake passage 41. The 1st butterfly valve 42 of Always closed which Open control the free passage between 7b by an engine midrange rpm is provided. the [ and ] -- the 3rd mutually located in the center in the cylinder column direction of the 1. 2nd cylinder groups 3a and 3b -- the 4th -- cylinder 2c, The upstream ends of 2 d of the 3rd and 4th independent intake passages 5c and 5d have connected the downstream end branched to two of the main intake passages 8 to the 1st and 2nd set intake passages 7a and 7b located, respectively, respectively. or [ having carried out ] -- this example -- a high rpm -- every -- valve opening of the 2nd butterfly valve 32 is open for free passage in free passage way 31.31 -- the -- since the 1. 2nd cylinder group 3a, and each independent intake passage 5a~5f between 3b are opened for free passage the [ between the 1st, the 2nd cylinder group 3a, and 3b ] -- the torque fall effect by the resonance effect which arose according to the free passage course through connection intake passage 41 which connects annularly the 1. 2nd set intake passages 7a and 7b is inhibited, the influence is lost, and an inertia effect can be increased. Also in this example, the same effect as the above-mentioned example can be acquired. in addition -- each above-mentioned example -- the -- the [ of every 1. 2nd cylinder group 3a3b ] -- the 1. 2nd set intake passages 7a and 7b -- the [ its 3rd / the / and ] -- free passage course L2 shorter than 4 independent intake passage 5c and free passage course L1 which connects 56 comrades by short distance, and a bigger cross-sectional area than the cross-sectional area of tube diameter X1 of free passage course L1 -- the -- the 1. 2nd set intake passage 7a. Although free passage way 15.21.31 which connects 7b was connected, respectively, the -- the [ for every 1. 2nd cylinder group ] -- the 1. 2nd set intake passage -- the [ its 3rd / the / and ] -- a free passage course shorter than the free passage course which connects 4 independent intake passages by short distance -- the -- the free passage way which connects the 1. 2nd set intake passages, the [ or / the 3rd and ] -- a bigger cross-sectional area than the cross-sectional area of the tube diameter of the free passage course which connects 4 independent intake passages by short distance -- the -- the free passage way which connects the 1. 2nd set intake passages may be made to be connected. The above-mentioned example is an example applied to V type 6-cylinder engine 1, or, in addition to this, it can apply the present invention also to engines, such as each engine (an in-series type 4-cylinder, 6-cylinder, and 8 cylinders), 8 cylinders of V models, a 12-cylinder engine. For example, in the case of V type 12-cylinder engine, it collects for every two cylinder groups by 6-cylinder [ which an intake stroke becomes at equal intervals / every ], and also it is possible to collect a 3 cylinder every and to divide into four cylinder groups. (EFFECT OF THE INVENTION) According to the suction system of the multi-cylinder engine in the present invention, like the above, miniaturization of an air intake system is attained by providing the connection intake passage which gathers the upstream end of the independent intake passage of each cylinder group to the set intake passage for every cylinder group prolonged to a cylinder column direction, and connects annularly the downstream ends of each of this set intake passage. Propagation of a resonance pressure wave is promoted by the set intake passage which extracted the cross-sectional area narrowly, While a high resonance effect can be obtained in an engine low rpm, Between the set intake passages of each cylinder group is made to open for free passage in an engine inertia alignment rotation region by the free passage way used as a bigger cross-sectional area than a course shorter than the free passage course which connects the independent intake passages of the cylinder which corresponds mutually in the center of the cylinder column direction of each cylinder group by an opening-and-closing valve, or the above-mentioned free passage course. It can do [ losing the influence by the above-mentioned resonance effect, when the inertia alignment which makes a free passage way the reversal part of a manifold-air-pressure wave arises, and acquiring a high inertia effect in an engine high rpm, or ].

[Brief Description of the Drawings]

Drawings 1 and 2 show the 1st example of the present invention, Drawing 1 is a top view of an engine and an air intake system, and Drawing 2 is the Model type top view. Drawings 3 thru/or 5 are 1st [ The ] figure equivalent figures showing other examples, respectively. 1 ... Engine 2a~2f ... Cylinder 3a 3b ... Cylinder group 4 ... Intake passage 5a~5f [ ... Free passage way ] ... Independent intake passages 7a and 7b ... Set intake passage 13.41 ... Connection intake passage 15.21.31 16.22.32 ... The 2nd butterfly valve (opening-and-closing valve) Ll, L3 ... Free passage course L2 by the side of a connection intake passage ... Free passage course by the side of a free passage way