Internal-combustion engines – Charge forming device – Supercharger
Patent
1990-02-20
1992-07-28
Bertsch, Richard A.
Internal-combustion engines
Charge forming device
Supercharger
123561, F02B 3300
Patent
active
051333252
DESCRIPTION:
BRIEF SUMMARY
The invention is concerned with a mechanical drive mechanism of a supercharger of an internal combustion engine with a rate of revolutions variator driven by the internal combustion engine's crankshaft from whose secondary disk an input shaft of a step-up gear is capable of being driven by an electromagnetically activated separating clutch, with which step-up gear a rotor shaft with a rotor of the supercharger is connected on the output side.
A mechanical drive mechanism for a supercharger of an internal combustion engine of the above-mentioned type is known from the EP-A 01 98 312 document. According to that document, a supercharger of the gyroscopic type driven by the internal combustion engine's crankshaft is supposed to be connected by means of an electromechanically activated separating clutch when a control member--the gas pedal of the motor vehicle that is driven by the internal combustion engine, for example--is moved out beyond its medium position. A switching of the internal combustion engine from suction operation to charge operation takes place as a result. During charge operation, an induction pressure sufficing for the desired increasing of the torque can be made available at low engine speed by raising the supercharger speed by comparison with the engine speed by means of a rate of revolutions variator.
The object of the invention is to arrive at a compact method of construction for a mechanical drive mechanism for a supercharger of an internal combustion engine of the above-mentioned type by means of which an arrangement of the mechanically driven supercharger in the usually very restricted engine space of a motor vehicle is made possible. In such an arrangement, the input shaft is to be supported in a favorable area in relation to the forces introduced by the drive and output mechanisms.
This object is achieved, for a mechanical drive mechanism for a supercharger of an internal combustion engine of the above-mentioned type, by letting the step-up gear be a planetary gear with an essentially cylindrical outer contour of its transmission case, with the input shaft being supported in an axially projecting collar on the transmission case and the electromagnetic separating clutch being located surrounding the collar radially, by having a clutch disk of the separating clutch fastened near the bearing on the input shaft on the one side and a ring gear of the planetary gear fastened on the other side and by having the radial dimensions of the drive mechanism combined into one unit and the supercharger essentially coincide. By using a planetary gear as a step-up gear, high rate of revolutions gear ratios in coaxial travel of the input and rotor shafts and with small radial external dimensions can be obtained when the drive comes from the input shaft through the ring gear and the secondary drive comes from a sun wheel of the planetary gear. If, as is suggested later on, the input shaft is supported in a radial collar on the transmission case that receives the electromagnetically activated separating clutch on its periphery at the same time, a very short, compact method of constructing the drive mechanism can be achieved, in which a favorable supporting of the input shaft directly between its drive mechanism by means of the separating clutch and its secondary drive mechanism by means of the ring gear can take place simultaneously. Coinciding radial dimensions of the drive mechanism--that is, of the secondary disk and the separating clutch with the supercharger--considerably improve the possibility of installing it in a motor vehicle.
According to a further object of the invention, the supporting of the input shaft can be made very compact and given great radial and axial carrying capacity if a double-line angular ball bearing with a big diameter is used. Because of its big diameter, the double-line angular ball bearing has a supporting space on the input shaft extending into the area where the ring gear and the clutch disk are located.
The use of a V-shaped gasket that is pressed onto the input shaft
REFERENCES:
patent: 1878210 (1932-09-01), Vincent
patent: 2552000 (1946-01-01), DuBois
patent: 2588462 (1949-06-01), Baker
patent: 3583825 (1971-06-01), Sadler et al.
patent: 4573891 (1986-03-01), Sakamaki et al.
Basichas Alfred
Bertsch Richard A.
Zahnradfabrik Friedrichshafen AG.
Zalkind Albert M.
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