FI65652C - ARRANGEMANG FOER FAESTNING AV EN DRIVAXEL TILL SEKUNDAERAXELN AV EN TAPPVAEXEL - Google Patents

Description

! 65652

The present invention relates to an arrangement for attaching a drive shaft to a pinion shaft, in which case it is usually a question of attaching a machine shaft inside a hollow secondary shaft, i.e. a tubular shaft, of a pinion.

The diameter of the secondary shaft of the pin gear tends to become unnecessarily large, due to the fact that the wall thickness of the hollow shaft must be large enough to withstand the torsional stresses applied to it. In addition to its weight, the large-diameter shaft is awkward in that its bearing becomes unreasonably expensive due to the very large bearing size. The structure of the tubular shaft is further weakened by a groove made for the parallel wedge. If the fitting between the drive shaft and the pipe shaft is moderately loose, the fitting is subjected to very high stresses, especially in punching use, which in turn results in a considerably rapid fitting wear. On the other hand, it is possible to make the fitting very tight, whereby the drive shaft on its own side supports the outer bearing, but in this case it is very difficult to disassemble the fitting due to rusting and the like. Thus, no optimal solution is known in the art.

The object of the present invention is to provide an arrangement for fastening between the secondary shaft and the drive shaft of the pin gear, by means of which the outer diameter of the secondary shaft of the pin gear can be kept reasonable, in addition to which it is easy to disassemble if necessary. This is achieved by an arrangement, the characteristic features of which are given in the appended claims.

The invention will now be described in more detail with reference to the accompanying drawing, which shows a sectional view of an arrangement according to invention 65652.

In the drawing, reference numeral 1 denotes the contour of the pin gear housing. The housing thus contains the necessary bogies for changing the gear ratio, which bogies are attached to the hollow secondary shaft 2 shown in the figure and, on the other hand, to a primary shaft (not shown) with a V-belt pulley at one end to drive the pinion. For the sake of simplicity, the secondary axle 2 shown in the figure is shown as a mere smooth axle, in which the necessary carriages are not marked. The drive shaft of the implement or the like is indicated by the reference number 3. The secondary shaft 2 is mounted by means of bearings 9 on the pin gear housing.

An arrangement according to the invention for connecting the shafts to one another is obtained as follows: A drive ring 11 is fitted to the drive shaft 3, which is slightly thinned at its mounting end, after which wedge rings 6 are fitted. In the embodiment shown in the figure, there are two pairs of wedge rings. The part of the pinion shaft outside the gearbox of the secondary shaft is provided with a stiffening ring 5, which is a very tight-fitting supporting metal ring. The drive shaft 3 with its key ring is then pushed into the secondary shaft 2 of the pin gear. At the opposite end of the secondary shaft there is a bore into which a mating piece 7 is inserted, the purpose of which is to act as a stop for the screw 8 and in addition as a mating piece for the bearing 9. The screw 8 has threads and the end of the drive shaft 3 has a bore with threads corresponding to the threads of the screw. The drive shaft 3 is tightened in place to wedge the rings by means of a screw 8, whereby the shoulder 10 on the inner surface of the secondary shaft 2 prevents the mating piece 7 and the screw base 8 from sinking deeper inside the secondary shaft. . The radial thickness of the wedge ring pair increases, resulting in a high radial compressive force of their f * i 65652 3 against each other and against the drive shaft 3 and the pipe shaft 2. The thin tubular shaft is able to absorb a large radial pressure, since the stiffening ring 5 prevents it from swelling excessively.

The wedge rings 6 cannot be used directly on the bearing on the drive shaft side, as this would make it more difficult to control the bearing clearance. The above-mentioned difficulty is thus overcome according to the invention in that the stiffening ring 5 is brought completely outside the gearbox, whereby the area defined by the ring 5 at the junction of the shafts 2 and 3 transfers torque from one shaft to another by friction. As can be seen from the figure, there are no protrusions of any kind on the outside of the gearbox on the opposite side of the fitting point of the shaft 3. It follows that a V-belt pulley or the like having a diameter such that it also extends at the position of the secondary shaft 2 can be used at the end of the primary shaft.

As can be seen from the figure, disassembly of the arrangement according to the invention is simple. By loosening the screw 8 and pushing the drive shaft out of the hole in the secondary shaft 2, the fit can be disassembled. The mating piece 7 is also easy to remove by pulling it out of place, since it can be fixed to the shaft 2 by means of a suitable medium which does not prevent pulling out.

Although only one embodiment of the invention has been described above, it is self-evident that it can be modified, for example, with respect to the mutual dimensions of the parts, the shaft shoulders and other details, within the scope defined by the appended claims. It is also clear that any other radially expanding connecting member can be used for the purpose instead of the wedge rings.

4 65652

The details to be modified also include, for example, the number of wedge rings, which can be increased in the case of larger pin gears. The part 11 is also unnecessary, in the event that the shoulder against the wedge rings of the shaft 3 performs the function of the ring 11.