Internal-combustion engines – Charge forming device – Supercharger
Patent
1990-02-20
1992-04-21
Bertsch, Richard A.
Internal-combustion engines
Charge forming device
Supercharger
123561, 415203, F03B 316, F02B 3300
Patent
active
051057930
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a mechanical driving mechanism of a supercharger for an internal combustion engine in which a rotor located in a supercharger housing is capable of being propelled by the internal combustion engine through a step-up gear that is a planetary gear, and by a rotor shaft.
BRIEF DESCRIPTION OF THE PRIOR ART
In a driving mechanism of a supercharger of this type (DE-PS 582 797), a clutch connected with the internal combustion engine's crankshaft and having a step-up gear in the form of a planetary gear and a supercharger are provided as separate structural units. By means of the clutch and a pawl free-wheeling mechanism, the supercharger can be shifted into two different revolutions-per-minute-stages--that is, a direct drive through the pawl free-wheeling mechanism and a geared stage with propulsion of the pinion cage with a stationary ring gear and secondary drive through a sun wheel fixed with the rotor shaft.
The known mechanical driving mechanism of a supercharger is not suitable for use on an internal combustion engine that is installed in a motor vehicle because of its large axial overall length. Since the pinion cage serves simultaneously as a coupling element for the friction coupling that is encumbered axially--because of a coupling operation--by way of a pressure plate and friction disks, pressure that has a negative influence on the noise and the working life of the planetary gear develops in the seating of the planetary wheels and also in the gear-tooth system of the planetary gear. Furthermore, imbalance at the rotating pinion cages with planetary wheels resting on them cannot be avoided, and when that is the case these balance deficiencies trigger vibrations in the rotor shaft that is meshed with the planetary wheels through a sun wheel, and those vibrations result in the destruction of the sealing of the rotorshaft. Another problem results from the fact that, when the pinion cage is rotating, a greater expenditure is necessary to deliver lubricating oil to the seating of the planetary wheels in sufficient quantities resulting in lubricating oil being thrown off in an undesired manner by the centrifugal force appearing in the seating. Finally, in addition to the rotating secondary carrier, a separate supporting wall is necessary to receive the rotor shaft's seating, and as a result the cost for construction and the dimensions of the driving device are increased considerably.
The object of the present invention is to avoid the above-mentioned disadvantages and to create a mechanical driving mechanism of a supercharger in which the dimensions and the costs for construction are reduced while overloading of structural parts in the planetary gear are avoided.
SUMMARY OF THE INVENTION
This object is achieved in a mechanical driving mechanism of a supercharger of the above-mentioned type by having the supercharger and the planetary gear assembly form one structural unit, with a ring gear of the planetary gear assembly being fixed with a primary shaft and the rotor shaft receiving a sun wheel accommodated in a hub part of a pinion cage of the planetary gear assembly. By this construction, the planetary wheels act as buffers between the ring gear that is fastened to the primary shaft and the sun wheel of the driven rotor shaft strongly geared to revolutions per minute, so that a stimulation of the rotor shaft by the primary shaft or the planetary gear to cause vibration is avoided. Furthermore, rotation deficiencies in the gear-tooth system in the planetary gear assembly are kept low because of the propulsion through the ring gear. The pinion cage, in addition to supporting the planetary wheels, simultaneously takes over the function of supporting the rotor shaft as a compact structural unit in an advantageous manner.
The planetary wheels can perform their function as vibration-damping members between the primary shaft and the rotor shaft by providing a floating support to their trunnions that are secured in the pinion cage, and when that is the cas
REFERENCES:
patent: 4802820 (1989-02-01), Komatsu
Breisch Harald
Schlichtig Karl
Winkelmann Siegfried
Basichas Alfred
Bertsch Richard A.
Zahnradfabrik Friedrichshafen AG.
Zalkind Albert M.
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