JPH02102323A - Suction device for type v engine equipped with supercharger - Google Patents

Abstract

PURPOSE:To make a suction system compact in an engine having a relief valve in a suction bypass passage for bypassing a supercharger by disposing the relief valve between both banks of the tape V engine. CONSTITUTION:A supercharger 1 is disposed on the side of an engine main body 1 of a type V engine, and a throttle body 20 is connected by a connecting tube 21 on the downstream of it. An air flow sensor 14 and the throttle body 20 positioned on the opposite side to each other with the engine main body 1 between them are connected with each other by a duct 22. The connecting tube 21 is also connected with the downstream side end part of an intake manifold 2 by a bypass passage tube 27. In this case, the other end of the bypass passage tube 27 is extended between the banks crossing over a right side head cover 6 to be connected with a connecting tube 28 connected with the downstream end of the intake manifold 12, and a valve body (relief valve) 30 provided with a negative pressure operation type actuator 29 is disposed at this connection part.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an intake system for a supercharger (;j' V-type engine).

(Prior Art) Conventionally, as described in, for example, Japanese Unexamined Patent Publication No. 59-565, it is known that an intake manifold is arranged using the space between banks in a V-type engine. .

By the way, when a supercharger, particularly a mechanical supercharger, is installed in an engine, a bypass passage for bypassing the supercharger is provided as described in, for example, Japanese Unexamined Patent Publication No. 62-178730. Normally, the supercharging pressure is controlled by opening and closing the passage with a control valve (relief valve), and natural intake without a supercharger is allowed in a specific operating range.

However, when a V-type engine with a supercharger is provided with a bypass passage that bypasses the supercharger as described above, for example, the intake manifold is placed between the banks as described above, and the bypass passage is connected to this intake manifold. When trying to do so, the problem becomes how to arrange the relief valve in the middle of this bypass passage. If the valve body that houses the relief valve protrudes significantly above the engine, the overall height of the engine will increase. Furthermore, if the bypass passage is largely detoured in an attempt to secure installation space for the relief valve, intake resistance will increase.

(Object of the Invention) The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide a relief valve provided in a bypass passage that bypasses a supercharger in a V-type engine with a supercharger in a functional and space-efficient manner. The purpose is to enable players to be cast in specific positions.

(Structure of the Invention) The present invention utilizes the space between banks in a supercharged V-type engine to functionally and efficiently arrange a relief valve. That is, the intake system for a supercharged V-type engine according to the present invention includes an intake bypass passage that bypasses a supercharger, and a relief valve that opens during a specific operation in the intake bypass passage. The intake system for a V-type engine is characterized in that the relief valve is disposed between both banks of the V-type engine.

(For I) By placing the relief valve between both banks of the V-type engine, the space between the banks is effectively used, making the intake system more compact, and a short bypass passage with low intake resistance is provided. becomes possible.

(Example) Examples will be described below based on the drawings.

FIG. 1 is an overall view of one embodiment of the present invention.

In this embodiment, the engine main body I has a cylinder block 2 formed in which three cylinders with non-consecutive ignition orders are divided into left and right banks and lined up in a row in the direction of the output shaft, and is fixed to the left and right upper parts of the cylinder block, respectively. It consists of a cylinder head 34, a head cover 5.6 that covers the top of each cylinder head 3.4, and an oil pan 7 that covers the bottom of the cylinder block 2 from below, and has a V-shaped cross section as a whole. . A generator and other auxiliary equipment 8, 9, 10 are arranged on both sides of the lower part of the engine body 1, and a compactly formed intake manifold 12 is arranged between the left and right banks at the upper part of the engine body 1. has been done.

The engine body l is vertically mounted in the center of an engine compartment 11 of an automobile. And engine room 11
An air cleaner 13 is disposed in the front part of the engine body 1 at a position to the left of the engine body 1 when viewed from the front side, and an air flow sensor 14 for detecting the amount of intake air is located behind the head cover 5 on the left bank. is arranged and connected to the air cleaner 13. A supercharger (mechanical supercharger) 15 is disposed on the right side of the engine body I opposite to the air cleaner 13, and the engine is located on the same side as the supercharger 15 and in front of the supercharger I5. An intake air cooler 17 connected to the supercharger 15 via an air pipe 16 is disposed on the side of the room 11 . A communication pipe 18 is disposed between the intake air cooler 17 and the front end of the intake manifold 12 disposed between the banks.

Behind the supercharger 15, a throttle valve 19 is located above the right-hand side bank cover 6.
A throttle body 20 is installed, and this is connected to the Suhar Charger I5 by a connecting pipe 21.

Further, the air flow sensor 14 and the throttle body 20 located on the opposite side of the engine room with the engine body 1 in between are connected by a duct 22. This duct 22 extends rearward from both sides above the engine main body 1,
It is arranged along the gap between the engine body 1 and the dash panel 23 at the rear of the engine room, and forms an intake passage that communicates the air flow sensor 14 and the throttle body 20.

The air flow sensor 14 and the throttle body 20 are located just inside the left and right suspension towers 2425 and above the left and right head covers. The air cleaner 13, supercharger 15, and intake air cooler 17 are located in front of the left and right suspension towers 24, 25, avoiding the left and right suspension towers 24, 25, and are jutted out to the left and right. The air intake port 26 of the air cleaner 13 extends inwardly and upwardly from the front side, and opens forward into the upper part of the engine room 11 in front of the engine body I.

The connecting pipe 21 connecting the throttle body 20 and the supercharger 15 is also connected to the downstream end of the intake manifold I2 by a bypass passage pipe 27. This bypass passage pipe 27 is connected to the rad cover to the right side.
A connecting pipe 28 extends across three sides of the intake manifold 12 to between the banks and is connected to the downstream end of the intake manifold 12.
is connected to. A valve body 30 equipped with a negative pressure-responsive actuator 29 is provided at the connecting portion thereof.
is interposed. In addition, the intake manifold 12
A negative pressure-responsive actuator 32 for driving the gloss valve in each branch pipe section 3I is disposed at the downstream end of the engine body 1. Three-way solenoid valves 33, 34 are provided for selectively introducing pressure or atmospheric pressure.

Next, the detailed structure of the two-part intake manifold 12 will be explained with reference to FIGS. 2 to 6.

Figures 2 and 3 show the above intake manifold 12.
FIG. 4 is a plan view and a front view of FIG.
The sectional view and FIG. 5 are the same BB sectional views. Further, FIG. 6 is a schematic diagram illustrating the main structure of this embodiment.

The intake manifold 12 includes independent intake passages 35 each composed of six branch pipe sections 31 corresponding to each cylinder of the left and right banks of the V-type engine, and left and right intake passages that collect these independent intake passages 35 for each bank. Gathering passage 3
6.37. Each intake collecting passage 36, 37 is compactly formed so as not to become an enlarged part in order to perform supercharging by utilizing the resonance effect of the intake system, and is formed in a compact manner so as not to become an enlarged part, and extends in the axial direction corresponding to the left and right banks. They extend in the longitudinal direction of the intake manifold 12 adjacent to each other and offset by a predetermined amount. And each intake collective passage 36.
The independent intake passages 35 of each bank are connected to openings 38 formed in the side wall of the bank 37 at intervals in the longitudinal direction.

Each intake collecting passage 36,37 is provided with an artificial opening 36a, 37a at its front end. These inlet openings 3
6a and 37a are located above the front end of the intake manifold 12, and each intake collecting passage 36.37 extends horizontally rearward from these inlet openings 36a and 372L. Almost directly above the opening 38 of the intake passage 35, the step portions 36b and 37b are curved downward. And this stepped portion 36
b, downstream of 37b, the opening 3 located most downstream
It extends straight to the rear position of 8. Above step part 3
6b and 37b are directly ``1'' of the opening 38 located at the most upstream position.
With the installation located in the flow, the intake air flows through these stepped portions 36b, 3.
It is deflected downward at 7b.

Said inlet openings 36a, 3 of each intake collecting passage 36.37
6b is connected to the intake air cooler 1 through the communication pipe 18 described above.
7 is connected. The communication passage formed inside this communication pipe 18 is divided into two at the connection portion with each intake air collecting passage 36, 37, and is gathered into one on the upstream side and communicates with the intake air cooler 17. As a result, the left and right intake passages 3
6.37' communicate with each other on the second-stream side.

Approximately rectangular openings 39, 4.0 are formed at the bottom of the downstream end of each intake air collecting passage 36.37, and these openings 39.40
are connected to each other by a lower communication path 4I. As shown in FIG. 4, this downstream communication passage 41 utilizes the space created between the left and right independent intake passages 31 below the intake collection passages 36 and 37 between the left and right banks, and is a curved intake passage. The intake manifold 12 is integrally formed at the bottom of the intake manifold 12 so as to extend largely toward the front side along lines 36 and 37. In this way, the left and right intake passages 3
Since the downstream sides of the 6.37s communicate with each other and this downstream communication path is long, the natural frequency of the intake system becomes small and the supercharging effect due to resonance increases in the low rotation range.

In order to prevent water and oil from accumulating at the bottom of the downstream communicating path 41, drain ports 42 are provided on the left and right toward the connecting portion with each bank.

At the lower front side of the intake manifold 12 located between the left and right banks, adjacent to the downstream communication passage 41, and between the left and right intake passages 35 below each intake collection part 36.37, as shown in FIG. A closed vacuum chamber 43 as shown is formed. This vacuum chamber 43 stores the operating negative pressure of the actuator 32 that drives the shutter valve 44 provided in each independent intake passage 35, the actuator 29 that drives the relief valve in the valve body 30, and the like.
Intake negative pressure from the left and right independent intake passages 35 is introduced and stored through the check valve 45.

The shutter valve 44 is provided to prevent intake air from blowing back at low speeds and low loads. At low speeds and low loads, the negative pressure stored in the vacuum chamber 43 is transferred via the three-way solenoid valve 34.
This actuator 3
2, each shutter valve 44 is closed to a predetermined opening degree.

At the front end of the intake manifold 12, the inlet openings 36a, 37a of the intake collective passage 36, 37 are provided.
A cooling water passage 46 is formed at a position directly below. The cooling water passage 46 has one end opened at the center of the front end surface of the intake manifold I2, extends downward, bifurcates into two, and opens at a connecting portion with the left and right banks. Cooling water enters through the upper opening and flows downward to be directed to each bank.

Bypass openings 47 and 4.8 are respectively provided in the upper walls of the downstream ends of the left and right intake collective passages 36.37, and the connecting pipe 28 is connected to the upper surface of the intake manifold 12 where these openings 47.48 are located. There is. The connecting pipe 28 forms two independent passages 28a and 28b that communicate with the left and right intake collective passages 3637, respectively, and is inverted toward the front side at three sides of the intake manifold 12, and the valve body 30 is attached to the tip of the connecting pipe 28. Connected horizontally. A horizontal inlet pipe portion 49 is formed in the valve body 30 on the side corresponding to the right bank, and the bypass passage pipe 27 is connected to this inlet pipe portion 49. A passage in the bypass passage pipe 27 and a passage 28a in the connecting pipe 28
, 28b constitute an intake bypass passage that bypasses the superfan tire 15.

A relief valve 50 connected to a negative pressure responsive actuator 29 is provided within the valve body 30, as shown in FIG. This relief valve 50 opens when the boost pressure reaches a predetermined value (06 to 07 kg/cm) or more to relieve the boost pressure, and also opens at low load (for example, when the intake negative pressure is 100 mmHg or more) to relieve the supercharging pressure. Charger 15 is bypassed and intake air flows. This prevents overcharging during high loads and reduces pump loss during low loads.

In this embodiment, as described above, the air cleaner 13
is disposed on one side in front of the suspension tower in the engine room 11, so it is possible to use an air cleaner with a sufficiently large capacity and to introduce cold air from the front to improve filling efficiency.

Since the intake air cooler 17 is also disposed in the front part of the engine room 11 on the opposite side from the air cleaner 13,
You can use enough space to install a large one and increase the cooling effect by drawing cold air from the front.

The throttle body 20 must be placed close to the passenger compartment in order to operate the throttle valve 19 with an accelerator wire or the like, and the supercharger 15 is required to be installed downstream of the throttle body 20. Since the supercharger 15 is located on the opposite side of the air cleaner 13, the throttle body 20 can be located behind the supercharger 15 and sufficiently close to the passenger compartment. Since the air cleaner I3 can be connected to the air cleaner I3 side by the duct 22 which is gently curved, an intake system can be obtained that can be sufficiently accommodated within the bonnet line without creating a sharp bend that increases intake resistance.

Furthermore, the intake air cooler 17 and the inlet openings 36a of the intake air collecting passages 36, 37 are arranged so as to introduce intake air into the intake manifold 12 from the front side.

37a are connected by the communication pipe 18, while ensuring the length of the branched passage portion to obtain the resonance effect, the overall length of the communication passage can be suppressed and the discharge resistance of the supercharger 15 can be reduced. Be able to do it.

Also, from air cleaner I3 to supercharger 15
Since the intake passage is long, the attenuation of the pulsating waves transmitted from the supercharger 15 to the second flow side is increased, so that the intake flow noise leaking to the outside via the air cleaner 13 is reduced. Moreover, Super Genoya 15
Since the second flow is throttled by the slot/sotorhalve 19, the effect of attenuating intake flow sound becomes large, especially at low loads.

Therefore, there is no need to particularly increase the size of the air cleaner in order to reduce intake air flow noise.

Furthermore, since the throttle valve 19 is provided upstream of the supercharger 15, when the intake valve 44 of each independent intake passage 35 is closed in a low load region, the load applied to the supercharger 15 is reduced. can improve fuel efficiency.

Moreover, the bypass pipe 27 that constitutes the intake bypass passage is
It is installed at almost the shortest distance from the direct flow of the supercharger I5 to the right side, across the upper part of the rad cover 6, and to the valve body 30 between the banks of the engine body 1, thereby reducing the intake resistance of the intake bypass passage. Filling efficiency under load can be increased. Since this bypass pipe has a relatively small diameter, it does not add much to the height of the engine.

The downstream side communication passage 41 of the left and right intake passages is formed integrally with the lower part of the intake manifold 12 by utilizing the space between the banks as described above, so that a sufficient passage length is ensured by curving toward the front side. Therefore, not only a compact intake system is obtained, but also the rigidity of the lower part of the intake manifold 12 including the independent intake passage 35 and the communication passage 4I is increased.

In addition, each intake collective passage 36, 37 is provided with stepped portions 36b, 37b that deflect the intake air flow immediately upstream of the opening 38 of the independent intake passage 35 that opens at the most upstream side. Since the flow velocity of the intake air flowing in is suppressed and the flow is changed downward, the phenomenon in which the intake air flows straight due to a large inertial force and biasedly flows into the independent intake passage 35 that opens at the rear end is alleviated. Further, by providing the stepped portions 36b and 37b, a space for providing the cooling water passage 46 at the front end of the intake manifold 12 is secured.

The valve body 30 is connected to the rear end of the intake manifold I2 to the front inverted part of one of the connecting pipes 28, and the bypass passage pipe 27 is connected to the inlet pipe part 49 formed laterally. Therefore, the space between the banks can be used effectively, and the intake bypass system and the entire intake system can be formed compactly.

Note that the present invention is not limited to the above embodiments,
It can be implemented in various other ways.

(Effect of the invention) Since the present invention is configured as described above, by arranging the relief valve using the space between the banks,
By arranging the supercharger bypass system functionally and efficiently, the entire intake system can be made more compact.

[Brief explanation of drawings]

FIG. 1 is an overall view of an embodiment of the present invention, FIG. 2 is a plan view of an intake manifold in the same embodiment, FIG. 3 is a front view of the same, and FIG. 4 is a sectional view taken along line A-Δ in FIG. 2. Figure 5 is the same B
-B sectional view, FIG. 6 is a schematic diagram of the main part of the same embodiment, and FIG. 7 is a diagram of the control area of the relief valve in the same embodiment. 1: Engine, I2: Intake manifold, 15 Varnish-percharger (mechanical supercharger), 27 Intake bypass passage, 28, Connecting pipe, 29: Acticoator, 3
0: Valve body 50. Relief valve.

Claims (1)

[Claims] (1) Provide an intake bypass passage that bypasses the supercharger,
An intake system for a supercharged V-type engine in which the bypass passage is provided with a relief valve that opens during a specific operation, characterized in that the relief valve is disposed between both banks of the V-type engine. Intake system for V-type engine.