Metal deforming – By use of roller or roller-like tool-element – With carrier for roller-couple or tool-couple
Patent
1994-12-15
1997-03-18
Larson, Lowell A.
Metal deforming
By use of roller or roller-like tool-element
With carrier for roller-couple or tool-couple
492 15, 74397, B21B 3514
Patent
active
056112335
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a transmission unit for driving two shafts lying essentially parallel, at least one shaft being movable at right angles to its lengthwise direction.
Such a transmission unit is used for, for example, driving two rolls of a rolling mill, in which the rolls are movable relative to each other in order to adjust the desired rolling thickness. The two rolls are in this case driven by one common drive motor. The transmission unit between the drive motor and the two rolls can then consist of a gear transmission with intermediate gears and/or bevel gears. Such a transmission unit has the disadvantage that it is complex in construction and that the synchronisation between the shafts is effected by means of a long, weak gear train. Moreover, in the case of rolling mills the bottom roll is often immovably fixed in a frame, and the top roll is movable, the bottom roll being driven by means of a fixed drive shaft and the top roll by means of a drive shaft with homokinetic couplings. This has the disadvantage that the torque which can be transmitted by the drive shaft with the homokinetic couplings is limited, particularly in the case of large roll gap variations, and the torsional stiffness of said drive shaft is not satisfactory. Finally, such a transmission unit requires a large amount of space next to the rolling mill.
The object of the invention is to eliminate these disadvantages by means of a transmission unit of the type mentioned in the preamble which is characterised in that the shafts are each provided with a crown wheel which meshes with a cylindrical pinion, each pinion having a shaft of which the axis intersects or crosses the axis of the shaft belonging to the crown wheel at right angles, and the rotations of the pinions being interconnected with a fixed transmission ratio.
This arrangement ensures that when a shaft is moved, the crown wheel thereof remains meshed with the corresponding cylindrical pinion, with the result that the transmission ratio between the drive motor and the shafts to be driven and the synchronisation of said shafts do not change.
The cylindrical pinions are in this case preferably fitted on one common shaft, and the axis of said shaft lies in the plane through the axes of the two parallel shafts or at a fixed distance parallel to said plane, independent of the movement of one of the shafts or of both parallel shafts. If the shaft of the pinions lies at a distance from the plane through the axes of the two shafts to be driven, it is simple to accommodate the shafts to be driven at this side in a bearing. In this case the transmission which will take the greatest load is obtained if the direction of the tooth force on the crown wheel is towards the place where the pinion would mesh if the axis of the shaft of the pinions lay in the plane through the two axes.
Fitting the cylindrical pinions on a telescopic shaft ensures that a considerable range for moving the shafts to be driven is obtained. If such a large range is not necessary, two pinions can be combined to form one pinion with continuous toothing.
The invention will now be explained in greater detail with reference to the drawing, in which:
FIG. 1 shows diagrammatically a side view of a rolling mill which is provided with a first embodiment of a transmission unit according to the invention;
FIG. 2 shows-diagrammatically a cross-section along line II--II in FIG. 1;
FIG. 3 shows diagrammatically a second embodiment of a transmission unit according to the invention;
FIG. 4 shows diagrammatically a third embodiment of a transmission unit according to the invention;
FIG. 5 shows diagrammatically the transmission unit from FIG. 4 in a changed position; and
FIG. 6 shows diagrammatically a fourth embodiment of a transmission unit according to the invention.
FIG. 1 shows a rolling mill 1, comprising a frame 2, in which two roll bearing blocks 3, 4 are accommodated. The lower roll bearing block 3 is fixed immovably in the frame 2, while the upper roll bearing block 4 is movable vertically in the frame. In this wa
REFERENCES:
patent: 4132099 (1979-01-01), Elsener
Crown Gear B.V.
Larson Lowell A.
Schoeffler Thomas C.
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