JPS63266158A - Suction device for engine - Google Patents

Abstract

PURPOSE:To produce an excellent suction inertia effect in a whole operation region, by a method wherein suction passages for a high speed and a low speed, being independent from each other and having different lengths, are formed at each cylinder, and are connected to a surge tank, and the middle of the suction passage for a low speed is also opened to the surge tank. CONSTITUTION:In left and right cylinder heads 2 and 3 of a V-type 6-cylinder engine, a primary port 7 and a secondary port 8 are formed at each cylinder 4, and suction passages 17 and 18 for high and a low speed, through which intake air in a surge tank 16 is fed to ports 7 and 8 are disposed independently from each other between banks L and R. A connection part 21 for a high speed, at which the suction passage 17 for a low speed is opened to a surge tank under surface 16b, is formed to the middle part, positioned in adjacent to a connection part 20 of the suction passage 18 for a high speed opened to the surge tank under surface 16b, of the suction passage 17 for a low speed. Shutter valves 23 and 22, opened during high speed rotation and closed during low speed rotation, are disposed to the connection parts 20 and 21, respectively, and are respectively coupled to a common valve stem 24.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an engine intake system, and more particularly to an improvement in the intake system in which the quality of the intake passage is made variable in accordance with the engine speed.

(Prior Art) Conventionally, as an engine intake device, for example,
As disclosed in Japanese Patent No. 119958, each cylinder has two intake passages, each intake passage is connected to a surge tank, and one intake passage is provided with a shatter valve, so that it can be used during low-load operation. While closing the shirt valve, high 0
This shirt valve is closed during load operation, and during low load operation,
It is known to achieve both reduction in pumping loss due to BI and reduction in suction resistance during high-load operation.

(Problems to be Solved by the Invention) By the way, in such an intake system, the passage length of one intake passage is made longer to make it a low-speed intake passage, and the passage length of the other intake passage is shortened to make it a high-speed intake passage. At the same time, a shatter valve is installed in the high-speed intake passage, and when the engine is running at low speeds, the shut-off valve is closed, and the intake passage is matched to the low-speed range by the low-speed intake passage. It is also known that the intake inertia effect matched to the high speed range is created by opening the shatter valve during rotation and using the high speed intake passage that functions dominantly. is connected to the surge tank, and a separate shutter valve is arranged in this communication part.If the shutter valve is closed at high engine speeds, the portion downstream of the surge tank communication part of the intake passage for low/low control can also be used in the high rotation range. It is possible to obtain an intake inertia effect that matches the engine speed, and it is possible to improve the charge LJt 'Jr rate in the high rotation range by a small amount.

However, in this case, the low-speed intake passage and the high-speed intake passage are each equipped with separate system valves, and it is necessary to move both shutter valves, so the structure of the intake system has to be changed. ! This poses a problem in that the reliability of the intake device is reduced and the intake device becomes larger.

The present invention has been made in view of this point, and its object is to improve the layout of the low-speed intake passage and the high-speed intake passage 1 so that each 19. % air) The ↑ and ivy valves arranged in the m path are provided coaxially so that the air intake system is connected to the air intake system in the cylinder.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a high-speed intake passage that is independent of each other and a low-speed intake passage that is 5 times longer than the high-speed intake passage. The target is an intake system for an engine having an intake passage and each intake passage is connected to a surge tank, and the low-speed intake passage is opened on one side of the surge tank in the middle of the low-speed intake passage. In addition to providing a connection 611 for the high-speed insect intake passage, the connection part of the high-speed insect intake passage to the surge tank is opened on the same side as the high-speed connection part, and the high-speed connection part of the low-speed intake passage and the high-speed intake At the connecting portions of the passages, there are arranged V-shaped valves that fluctuate when the engine rotates at high speeds and engage when the engine speeds at low speeds, and the respective scissetter valves are connected by the same valve shaft so as to be interlocked with each other.

(Function) With the above configuration, in the present invention, when the engine is running at low speeds, both the A and vine valves are closed, and intake air is supplied from the surge tank to the cylinder via the low-speed intake passage. Increases the effect by 19. On the other hand, when the engine rotates at high speeds, both intake valves open, and intake air is supplied from the surge tank to the cylinder via the high-speed intake passage, and is also supplied to the cylinder via the high-speed connection downstream of the low-speed intake passage. The result is an intake inertia of 21J that matches the high rotation range while reducing intake resistance.

In that case, since the high-speed connection part of the low-speed intake passage and the connection part of the high-speed intake passage are both opened on the same side of the surge tank, the shirt tabs f arranged at each connection part can be connected with the same single shaft. ;! T! Therefore, the structure of the intake air becomes simple and compact, which overcomes the above-mentioned intake inertia effect.

(Example) Hereinafter, six actual color examples of the present invention will be explained based on the drawings.

1 and 2 show a V-type six-cylinder engine equipped with an intake system according to an embodiment of the present invention, 1 is a cylinder block, and 2.3 is arranged on each bank L, R of the cylinder block 1. A plurality of cylinders 4, 4, . . . are formed between the cylinder block 1 and each cylinder head 2, 3, and a piston 5 is fitted into each cylinder 4. A combustion chamber G is formed in the upper part of each cylinder 3. Each cylinder head 2.3 above
A primary port 7 and secondary ports 1 and 8 are provided in each cylinder 4 for supplying intake air to the cylinder 4. Each primary port 7 is provided on the rear side in the crankshaft direction of each cylinder 4, and each secondary port 1-8 is provided on the front side in the crankshaft direction in each cylinder 4, and both have one end connected to the combustion chamber 6. I'm looking forward to it! ! The ends thereof open toward the inner side of the bank of each cylinder head 2, 3. Further, each cylinder head 2.3 is provided with an exhaust boat 9.9 for discharging exhaust gas from each cylinder 4fυ. IQ valve 1 for each primary port 7 and secondary port 1 to 8 above.
0, each exhaust port 9 is provided with an exhaust valve f11, which is driven at a predetermined timing by a rib valve system member. Furthermore, a large-spot rag 12 for igniting the air-fuel mixture is disposed at the center of the top of the combustion chamber 6 of each cylinder 4. Further, 13 and 14 are cylinder head covers disposed on each cylinder head 2.3, and 15 is an injector for supplying fuel to the primary bows 1-7 of each cylinder 4.

Also, above the cylinder head cover 14 of the right bank R is a surge tank 16 for adding pulsation of intake air.
is arranged t2. As shown in FIG. 1, the surge tank 16 has a substantially triangular cross section, and its upper surface 16a
is provided horizontally, and the lower surface 16b is provided parallel to the upper surface of the cylinder head 3.

Further, between the banks, a low-speed intake passage 17 that supplies intake air from the surge tank 1G to the primary port 7 of each cylinder 4 and a high-speed intake passage 18 that supplies the secondary port 8 are independent of each other for each cylinder 4. It is arranged as follows. Each low-speed intake passage ``!817 is a high-speed intake passage 18
If the passage length is longer than b, when one intake air is co-supplied to each cylinder 4 via each low-speed intake passage 17, the intake inertia effect matched to the low rotational speed range of the engine will be 1!7, and on the other hand, When intake air is supplied to each cylinder 4 through each of the 73 consecutive intake passages 18, the intake inertia effect matched to the high rotation range is 11? The length of each passage is set so that the

One end of each of the low-speed intake passages 171 is connected to the primary bows 1 and 7 of each cylinder 4, and the other end extends toward the upper part of the bank, then turns to the right bank R1111, and the surge Mounted on the lower surface 161) of the tank 1G and the outer side of the bank 1. : Extends to the outer end of the bank on the lower surface 16b! The connecting portion 19 is formed in this manner. On the other hand, one end of each single intake passage 18 is connected to the secondary bows 1 and 8 of each cylinder 4, and the other end extends toward the upper part between the banks, and then the right bank r<11
113, and the above I energy tank 16 remains approximately horizontal.
The connecting portion 20 is opened at the inner end of the bank on the lower surface of the bank.
is formed. And these low speed fumarole passages 1
7°17... and high-speed intake passages 18, 18... are fixed to the cylinder head 2.3 via J3 at the upper part between the punctures and via the 7 langes. Furthermore, the low-speed intake passage 17 of each cylinder 4 in the left bank L is located between the low-speed intake passage 17 of the opposite cylinder 4 in the right bank R and the high-speed intake passage 18 of the cylinder 4 on the rear side of the cylinder 4. In addition, the high-speed intake passages 18 of each cylinder 4 in the left bank [-] are arranged between the low-speed intake passages 17 and the high-speed intake passages 18 of the opposing cylinders 4 in the right bank R. Therefore, the low-speed intake passages 17 and 17 of the opposing cylinders 4 and 4 of each bank L and R are connected to each other and i! ! The i-speed intake passages 18 and 18 are connected together in parallel between the flange and the surge tank 16.

Further, in each of the low-speed intake passages 17, a portion 43 facing the bank outer end of the lower surface 16b of the serger tank, that is, a portion connected to the connecting portion 20 of the high-speed intake passage 18, is provided with the low-speed intake passage. 17 above ・Bottom side of nage tank 1
6b is provided with a high-speed connection part 21 having a width of V, and when the intake air from the surge tank 16 is supplied from this connection part 21 to each cylinder 4 via the low-speed intake passage 17, it is matched to the high speed range of the engine. The intake inertia effect is 1!
? It is made so that it can be done.

Furthermore, the high speed connection portion 21 of each of the low speed intake passages 17
A shutter valve 22, 23 is disposed at the connecting portion 20 of each high-speed intake passage 18, respectively. The shutter valves 22, 22..., 23, 23... are connected by the same valve shaft 24 arranged in the direction of the crankshaft so as to interlock with each other, and an actuator connected to the valve shaft 24 (
(not shown), and when the engine is running at high speed, each of the V ivy valves 22 and 23 is set in the solid line J in FIG. High-speed connection part 2 of each low-speed side intake passage 17
1 to each cylinder 4 through the downstream side, and when the engine is running at low speeds, the intake valves 22 and 23 are closed as shown in the imaginary line in Figure 1 to direct the intake air from the surge tank 16 to each low-speed intake passage. 17 to each cylinder 4.

In addition, in the surge tank 16, the il filter 4 is connected in parallel.
'L/: Low speed +91 air passage 17. Between the 17 groups, one end opens into the surge tank upper surface 16a, and the curved end penetrates the surge tank 1G toward the spark plug 12 of each cylinder 4 and connects to the surge tank lower surface. 1-25.25 is provided with a spark plug 16b that opens to J3.
Workability during demolition is maintained at 611.

Therefore, in the J3 of the above embodiment, both the intake valves 22 and 23 are closed at low engine speeds, and the intake inertia effect matched to the low speed range is achieved by each low speed intake passage 17. Both shutter valves 22 at high engine speed
．． 23 is opened and the intake inertia effect of not only each high-speed intake passage 18 but also the high-speed connection part 21 downstream of each low-speed intake passage 17 is extended to the high-speed range (7), the low-speed engine It is possible to achieve both improvement in filling efficiency and reduction in pumping 1st at engine speed, and improvement in filling efficiency and reduction in suction resistance in a3 at high engine speed.

In the case of A, each connection is It is now possible to use the same valve shaft 24 for the shaft valves 22 and 23 arranged in the valves 20 and 21, and the intake air of 1 meter, which eliminates the above-mentioned intake inertia effect, enters the bloodstream and increases its reliability. When the size is lowered, it can be made more compact.

Furthermore, the low-speed intake passages 17.17 of the opposing cylinders 4°4 of each bank L and R, and the high-speed intake passages 18.
18 are connected together in parallel between the seven lunges and the cylinder 1G, so that the low-speed intake passage 17 and the high-speed intake passage 18 of each cylinder 4 are connected to both intake passages 17. of the cylinders 4 facing each other. Compared to the case where the intake passages 17 and 18 are arranged in a detour manner, each intake passage 17, 18 can be made into a straight one, and intake resistance can be reduced.

Moreover, in addition to the parallel arrangement of the low-speed intake passage 17 and the high-speed intake passage 18, the long-length low-speed intake passage 17 is arranged on the bottom surface 16b of the surge tank at the outer end of the bank. On the other hand, since the short overall length of the high-speed intake passage 18 was opened at the bank inner end of the surge tank bottom surface 161), the low-speed intake passage 1 arranged in parallel
7. The plug service boat 25 can be installed between the 17 shafts, and workability when installing and removing the spark plug 12 can be ensured.

In addition, since the +J-di tank 16 is arranged on one bank R, by bending the low-speed intake passage 17 and the high-speed intake passage 18 at the upper part between the banks, a sufficient pipe length can be obtained without increasing the overall height of the engine. can be secured.

Furthermore, since the upper surface 16a of the surge tank 16 is provided horizontally and the lower surface 161 is provided parallel to the upper surface of the cylinder head 3, interference with the bonnet 1 etc. when the engine is activated (automatically, etc.) is prevented. The denomination of the surge tank 16 can be made as large as possible while avoiding this, and the effectiveness of the intake inertia effect can be greatly improved.

Further, the lower surface 16b of the surge tank is inclined upward toward the inner side of the bank, and the inner end of the bank (A) is located at a higher position, so that the high-speed intake passage 18 that opens at this end is gently curved. This can contribute to reducing the intake resistance.

Furthermore, the connecting portion 21 and the connecting portion 21 to 1 of the low speed intake passage 17 and The shutter valves 22 and 23I provided at the connection part 20 of the triple intake passage 18 are opened.
Since it is maintained horizontally so as to be substantially parallel to the intake air passages 17 and 18 near J3, the intake resistance at J3 can be reduced when the engine rotates at high speed.

(Results of the Invention) As explained above, according to the engine intake system of the present invention, each cylinder has a high-speed intake passage and a low-speed intake passage having a longer passage length than the high-speed intake passage. A high-speed connection part is provided between one side of the nerge tank in the middle of the low-speed intake passage, and a connection part of the high-speed intake passage to the surge tank is opened on the side surface, of the intake passage? 11 ivy valves that open at high engine speeds and open at low engine speeds are arranged at the 3rd speed connection and the high speed intake passage connection, and the same 11 ivy valves are arranged so that the respective shack valves are interlocked with each other. Since they are connected by a shaft, at low engine speeds, the low speed intake passage matches the low speed range, reducing the intake inertia effect by 111, and at high engine speeds, the high speed intake passage and the low speed intake passage are connected downstream of the high speed connection. This allows the intake inertia effect to be reduced to 1:1 by reducing the intake drag and matching the high rotational speed range, while simplifying the structure of this intake device, increasing its reliability, and making it more compact.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a longitudinal sectional front view of the engine, and FIG. 2 is a plan view of the engine. 4...Cylinder, 16...Surge tank, 1G1)
...Bottom surface, 17...Low speed intake passage, 18...?
3rd speed intake passage, 20...Connection part, 21...High speed connection part, 22゜23...Shutter valve, 24...Valve stem, L...bank, R...ti bank. Patent applicant Mazda Motor Corporation 1st generation J! I! Person Katamushi Mae 1
) Hiro ゛, 2′, :l ', :'

Claims (1)

[Claims] (1) An engine intake system comprising an independent high-speed intake passage for each cylinder and a low-speed intake passage having a longer passage length than the high-speed intake passage, and each intake passage is connected to a surge tank. , a high-speed connection part is provided in the middle of the low-speed intake passage to open the low-speed intake passage to one side of the surge tank, and a connection part of the high-speed intake passage to the surge tank is connected to the high-speed connection part. Shutter valves that open on the same side and open at high engine speeds and close at low engine speeds are disposed at the high-speed connection part of the low-speed intake passage and the connection part of the high-speed intake passage, respectively, and the shutter valves are interlocked with each other. An engine intake system characterized in that they are connected by the same valve shaft.