Internal-combustion engines – Charge forming device – Supercharger
Patent
1981-02-08
1983-11-15
Cuchlinski, Jr., William A.
Internal-combustion engines
Charge forming device
Supercharger
60611, F02B 3302
Patent
active
044149522
DESCRIPTION:
BRIEF SUMMARY
SUMMARY OF THE INVENTION
The present invention relates to an actuator for an air valve in the boost air duct of an IC engine.
BACKGROUND OF THE INVENTION
From the prior art it is known to provide a butterfly valve in the boost air duct of, for example, a supercharged diesel engine for help in starting up the engine. Such a valve is shut at least till the engine has fired, and then the valve is opened, at the latest, by the time the engine has run up to a speed outside the idling range. The valve is then kept open till the engine is shut down again. More specially, diesel engines with pressure wave superchargers must have a butterfly valve at this position working in this manner, as otherwise, if transfer of gas and air between the supercharging air and exhaust gas sides of the supercharger occurs during the start-up stage at the time of the first strokes of the engine on starting, such transfer of exhaust gas would be likely to cause exhaust gas to enter the boost air duct of the engine and cause immediate stoppage of the engine.
German Published Application No. 2,631,257 discloses an actuator for a butterfly air valve in the boost air duct of a diesel engine, more specially a diesel engine with a pressure wave supercharger. The actuator has a shut-off valve in an actuator line running from an oil pressure line of the diesel engine to an actuator space for an actuator piston of the butterfly valve, the other side of this piston being acted upon by a force at all times. The shut-off valve is designed to be moved in the opening direction by a piston (which is acted upon on one side by air from the boost air duct for moving the piston in the said opening direction, and acted on on its other side by a spring) and may only be closed when there is no oil pressure. The shut-off valve is actuated by the actuator piston and may be closed in the rest position of the actuator piston (in which the butterfly air valve is closed), when there is no oil pressure present in the system.
OBJECT OF THE INVENTION
The object of the present invention is an actuator of the type described hereinabove which, while simple in structure, enables automatic actuation of the air valve, in a way fully in harmony with desired functions, even without connection with the pressure oil line of the IC engine.
In one embodiment of the invention, the air valve is fixed to a shaft extending out of the boost air duct so that the air valve is swingably supported in the wall of the boost air duct and, for turning the shaft into the closed position of the air valve, there is at least one spring acting on the shaft, while for turning the shaft in the opposite direction into the open position of the air valve, the shaft is connected by a lever system to at least one piston actuated by the pressure of the supercharging air and/or by vacuum.
BRIEF INTRODUCTION TO THE DRAWINGS
In order that the invention may be more clearly understood, reference will now be made to the accompanying drawings, wherein several embodiments are shown for purposes of illustration.
FIG. 1 is a view of the actuator connected to a diesel engine, for example.
FIG. 2 is a section through the actuator of FIG. 1 on the line II--II of FIG. 1.
FIG. 3 is a section on the line III--III of FIG. 2.
FIGS. 4 to 9 are sections, taken in the same direction as the section of FIG. 2, through further embodiments of actuators.
DESCRIPTION OF PREFERRED EMBODIMENT
In FIG. 1, a diesel engine (not shown in detail) is numbered 1. An intake or induction pipe 3 extends from an intake filter 2 to a supercharger 4 which is connected on one of its sides by way of a boost air duct 5 and on its other side by way of an exhaust pipe 6 with engine 1. Through a pipe 7 it is possible for the exhaust gases to escape from the supercharger 4 to atmosphere. In the boost air duct 5, there is a butterfly air valve 8 having an actuator. The valve 8 is next to a housing part 10 for the air valve actuator. The housing part 10 is connected to air pipe 5' for driving the actuator, the pipe 5 being branched off fro
REFERENCES:
patent: 2853987 (1958-09-01), Berchtold et al.
patent: 3180330 (1965-04-01), Barnes
Fried Reinhard
Heller Rudolf
Hubner Heimo
BBC Aktiengesellschaft Brown, Boveri & Cie.
Cuchlinski Jr. William A.
Knorr-Bremse GmbH
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