Internal-combustion engines – Charge forming device – Supercharger
Patent
1990-02-20
1991-11-12
Bertsch, Richard A.
Internal-combustion engines
Charge forming device
Supercharger
123561, F02B 3300
Patent
active
050639048
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a mechanically driven supercharger for an internal combustion engine with a rotor shaft capable of being propelled by a primary shaft and a step-up gear that is a planet gear, with the rotor shaft running coaxially to the primary shaft and receiving a sun wheel of the planet gear.
BRIEF DESCRIPTION OF THE PRIOR ART
Driving a supercharger with a step-down gear of the above-mentioned type that is a planet gear is known from DE-PS 582 797. When the supercharging device is located at the front of the internal combustion engine, a shiftable friction clutch and the step-down gear are located in a first housing, while the rotor shaft that is propelled with high gearing leads to the rotor that is located in a separate housing. Structurally, the entire layout of the supercharger has large dimensions and is not suitable for use on an internal combustion engine being operated in a motor vehicle. Furthermore, the manner in which the rotor shaft driven with a very high number of revolutions is to be supported is not indicated in the prior art.
SUMMARY OF THE INVENTION
Therefore, the object of the present invention is to provide a compact mechanical driving mechanism of a supercharger whose support of the rotor shaft will achieve a long working life in spite of a high number of shaft revolutions.
That object is accomplished in accordance with the invention by letting the support of the rotor shaft have radial and axial play with respect to its location in a fixed housing section of the supercharger. The radial play of the support results in a pronounced reduction of the strain resulting from the residual imbalance of the rotor shaft and the sun wheel. Specifically, because of the radial play, the degree of freedom of the rotor shaft's support is increased in such a way that a rotation of the rotor shaft around its centroidal axis is made possible. The supporting forces come into being because the forces of gravity can be reduced considerably. The axial play makes free movement of the support within the radial play possible.
According to additional embodiments, the radial play should be up to 0.1 mm, and preferably 0.5 mm. A radial play of that order of magnitude makes the positioning of the rotation axis of the support on the centroidal axis of the rotor shaft possible. Furthermore, a damping device should be fitted in the annular gap created by the radial play, so that the support floats in the housing section. For an additional reduction of the strain, it is advantageous to support the rotor shaft between the rotor and the step-up gear. Locating the support between the rotor and the step-up gear results, on the one hand, in a very compact construction of the driving mechanism and prevents the rotor shaft from being vibrated by the primary shaft.
The support can have two sloping-shoulder bearings that are located in such a way that they enclose a large supporting space on the rotor shaft. The angular ball bearings are in position to absorb high radial and axial forces. These angular ball bearings can be located in a cylindrical guide bearing in another embodiment of the invention in which provision is made for the radial and axial play of the support between the outer jacket of the guide bearing and a location hole of the fixed housing section. Lubricating oil is delivered to the support or rings located in the annular gap which are suitable as damping means, with those rings simultaneously ensuring a secure passage of the lubricating oil to the support as sealing elements and sealing the planet gear off against the supercharger.
The guide bearing is axially fixed when the guide bearing is supported on one end with a radial collar at the fixed housing section, while a ring is fastened to it with screws or clamps on the other end. By that means, as is suggested in other embodiments of the invention, the entire unit consisting of the rotor, rotor shaft, angular ball bearings, guide bearing and sun wheel can also be preassembled and counterbalanced. Further disas
Breisch Harald
Schlichtig Karl
Winkelmann Siegfried
Basichas Alfred
Bertsch Richard A.
Zahnradfabrik Friedrichshafen AG
Zalkind Albert M.
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