Internal-combustion engines – Intake manifold – Manifold tuning – balancing or pressure regulating means
Patent
1995-10-16
1998-09-29
McMahon, Marguerite
Internal-combustion engines
Intake manifold
Manifold tuning, balancing or pressure regulating means
F01L 100, F16C 2700
Patent
active
058133801
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a suction control device for a multiple cylinder internal combustion engine incorporated in a vehicle or the like, and more particularly to a suction control device for a multiple cylinder internal combustion engine with specific features in the butterfly valve opening and closing a suction path and the bearing of the rotary shaft therefor, and the tightening construction between members thereof.
2. Background Technology
Conventionally, so-called a variable suction system, in which a length of a suction pipe and a path capacity are switched in two stages according to such factors as a rotational speed of an engine or a load or the like to give an inertia supercharge effect or a resonance supercharge effect to intake air for the purpose to improve output from the engine, has been employed as a suction system for an engine.
FIG. 1 shows a cross sectional view of the suction control device wherein the variable suction system described above is employed for a six-cylinder engine. In this figure, a cross section of one suction path corresponding to one-cylinder of engine is shown, but actually the suction paths corresponding to six cylinders thereof are formed monolithically in parallel in a direction vertical to the sheet carrying this figure.
In the suction control device described above, the intake air introduced from a side end of the body into a surge tank 1 via a throttle valve (not shown herein) is introduced into an engine cylinder, passes through a roundabout suction path 3 as shown by the arrow A when a switch valve 2, which is a butterfly valve, is closed by operation of an actuator (not shown) if the speed is in a range of low or medium level (a state shown by a solid line), while, if in a range of high speed, the switch valve 2 is in the open state (a state shown by a two-dot chair line), and the intake air is directly introduced into the engine cylinder without passing through a roundabout suction path 3 as shown by the arrow B.
Namely, by opening and closing the switch valve 2, pressure inverted wave generated through a long suction pipe is synchronized in a low and medium range of speed and that generated through a short suction pipe is synchronized in a high range of speed for thereby improving the charging efficiency in the entire range of speed, thus improvement of torque in a low/medium speed range and that of maximum output power being achieved concurrently.
Also, in the suction control device employing the variable suction system as described above, a body section thereof presenting a suction path as well as a surge tank or others is molded by using aluminum material, and the changing valve 2 as well as the rotary shaft 2a therefor are molded by using steel or the like.
And because of the restrictions in the molding technology as described above, a suction control device is separated into three areas, namely a branch portion (I) forming only a suction path, a valve body portion (II) presenting a changing valve 2 therein which is a multiple butterfly valve and also forming a suction path, and a cover portion (III) forming a surge tank 1 and presenting a port shell 4 therein constituting a portion of the roundabout suction path 3, and each of the three portions is molded discretely, and then each of the mounting flange surfaces is monolithically butt-jointed to each other by using a connecting means (not shown) such as bolts and nuts or the like.
Furthermore, as for the multiple butterfly valve, as shown in FIG. 2, a concave notch is formed in a portion corresponding to each suction path of a line of the rotary shaft 2a, a valve 2 is fixed by using a tightening means such as a bolt 2b in this area, and a driving means comprising, for instance, an arm 2 and an actuator 5 is connected in one end of the rotary shaft 2a with the above-described valve 2 fixed thereto, so that all valves can monolithically be rotated.
Also, as for an assembly method and a supporting method for this multiple butterfly valve, as
REFERENCES:
patent: 4862840 (1989-09-01), Matsunaga et al.
patent: 4907547 (1990-03-01), Daly
patent: 5033417 (1991-07-01), Van Basshuysen et al.
patent: 5243933 (1993-09-01), Mukawa
patent: 5492088 (1996-02-01), Ohrnbegger
patent: 5546900 (1996-08-01), Adamek et al.
Hashimoto Toru
Ishiguro Shigeyuki
Kakinuma Hideo
Miya Hisakazu
Miyake Mitsuhiro
McMahon Marguerite
Mikuni Corporation
Mitsubishi Jidosha Kogyo Kabushiki Kaisha
Tokyo Roki Corporation
LandOfFree
Suction control device for multiple cylinder internal combustion does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Suction control device for multiple cylinder internal combustion, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Suction control device for multiple cylinder internal combustion will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-678020