Torque division gearing

A torque division gearing system is disclosed wherein two pairs of bevel gears are provided with each pair having a large bevel gear and a small bevel gear. One of the small bevel gears is arranged on an input shaft and the other small bevel gear is mounted on a second shaft parallel to the input shaft. Each of the small bevel gears drive the respective two large bevel gears arranged on a common axially displaceable shaft. The displaceable shaft is coupled by a gear stage to an output shaft.

BACKGROUND OF THE INVENTION 
The invention concerns a torque division gearing designed as a bevel gear 
spur wheel gearing with a primary shaft and an output shaft as well as 
with two pairs of bevel wheels. 
In driving conveyor belts, plate conveyors, travel gearing, etc., gears are 
required in which the motor is arranged in the longitudinal direction of 
the gear. The gearing itself should be constructed so as to be narrow and 
should be provided as slip-on gearing as well as stationary gearing. 
Suitable gearings are the known bevel spur wheel gearings. In the case of 
the bevel spur wheel gearings, however, limits are set with respect to the 
transferability of high outputs by means of a bevel wheel stage. 
From the German OS No. 2,544,045.3, a bevel spur wheel gearing is already 
known in which for the increasing of transferable output, two pairs of 
bevel wheels are present, each of which takes up half of the output 
transferred. For a uniform distribution of output onto the two pairs of 
bevel wheels, this known gearing has an axially shiftable drive shaft. 
SUMMARY OF THE INVENTION 
The object of the invention is to improve a multiple output gearing of the 
previously mentioned kind, and, in particular, to provide an embodiment 
which is lighter and smaller, and in which the output distribution to the 
two bevel wheel stages occurs even more uniformly. 
The object is achieved in that the two large bevel wheels of the bevel 
wheel pairs are arranged on a common axially displaceable shaft. By means 
of this arrangement the bevel wheels may be arranged directly adjacent one 
another and, further, the load distribution occurs directly in the bevel 
wheel stages. The load distribution is thus not influenced by different 
efficiency factors of gearing stages connected in series. Further, since 
the gearing output shaft is fixed axially, one can dispense with a 
coupling which equalizes the axial movement. There results a better, more 
uniform load distribution as well as an especially favorable and simple 
manner of construction for the gearing, so that the gearing can be made 
both smaller and also be, as a whole, more heavily loaded. Surprisingly, 
it has become apparent that bevel wheel stages can also be driven with 
variable tooth backlash without lowering the durability. The prerequisite 
for this is a precise manufacture of the gear wheels and an exact 
adjustment of the power branches so that the axial movements remain very 
slight. 
For the design of the invention the small bevel wheel of the one pair of 
bevel wheels is arranged on the primary shaft and the small bevel wheel of 
the other pair of bevel wheels is arranged on a second shaft running 
parallel to the primary shaft, whereby the primary shaft and the parallel 
second shaft are connected with one another by a straight toothed spur 
wheel stage. In this manner, the gearing is developed in an especially 
simple manner and the prerequisite is established for the output 
distribution in the bevel wheel stage. 
In a further development of the invention the bevel wheels are adjustably 
fastened opposite one another on the axially displaceable shaft, whereby 
the fastening of the bevel wheels occurs with a forced feed lubricator 
connection which can be operated externally. In this manner, the 
adjustment of the exact angle position and the mean backlash of the two 
power branches is especially simple and easy to accomplish. Tension 
devices which are difficult to move and which have very high friction need 
not be employed in order to attain the mutual fine adjustment. By means of 
this mounting of the bevel wheels according to the invention, the required 
exact adjustment of the two power branches to one another may occur 
especially quickly, so that the assembly costs for the gearing are also 
low. 
In a further development of the invention the axially displaceable shaft is 
shorter than the width of the housing and the axially displaceable shaft 
is supported on the one side in the housing wall and on the other side in 
a bearing block. There results, therefore, a particularly favorable 
solution which permits the use of a simply designed housing and at the 
same time lessens the gearing weight. 
In another development of the invention, the spiral directions of the bevel 
wheel tooth systems are arranged to function counter to one another. 
Therefore, the axial forces of the two bevel wheel stages are always 
directed against one another and no outward axial forces result. 
Therefore, especially small bearings can be used so that by means of this 
technique, to an extent previously unattained, a bevel spur wheel gearing 
results which is light and which can be highly loaded.

DESCRIPTION OF THE PREFERRED EMBODIMENTS 
In the drawing, 1 designates the gear housing, 2 the gearing primary shaft, 
and 3 the output shaft. 
Parallel to the primary shaft 2 the branching shaft 4 is arranged which is 
connected with the primary shaft 2 via the spur wheels 5 and 6 which are 
advantageously straight-toothed and which are geared 1:1. 
The primary shaft 2 is driven by a motor, not shown, preferably through the 
intermediary of a coupling. The drive output is then distributed between 
the primary shaft 2 and the branching shaft 4 and is transmitted to the 
large bevel wheels 9 and 10 via the bevel pinions 7 and 8 which are 
arranged upon the two shafts. 
The large bevel wheels 9 and 10 are fastened on the axially displaceable 
shaft 11 with the help of oil press connections which are supplied with 
pressure oil by means of the bores 12a and 12b, which are indicated by 
broken lines. The axially movable shaft 11 is supported on the one side in 
the housing 1 and on the other side in the inner bearing block 13. In the 
case of smaller gearings, a conventional support in both sides of the 
housing can be advantageous. Next to the two bevel wheels 9 and 10 on the 
axially displaceable shaft 11, the pinion 14 is arranged, which meshes 
with the output wheel 15. In order to avoid axial thrusts, the pinion 14 
and the output wheel 15 are provided in straight-toothed or double 
bevel-toothed fashion. The output wheel 15 is connected with the output 
shaft 3 which is provided advantageously as a hollow shaft. The hollow 
shaft is mounted on the shaft 16 of the driven apparatus. 
The separation line of the gearing according to the invention is straight 
and the individual gearing branches can first be put in, and subsequently, 
with the help of oil press connections, can be simply and easily adjusted 
with respect to their angular position to one another. Therefore, a simple 
and easy inspection of the angular position and of the backlash during a 
360.degree. rotation is possible. 
In all there results an especially light and small gearing, especially 
suited for the use of hardened gear wheels. In a manner not shown, it can 
be advantageous in the case of this gearing to cool the gearing oil 
separately in an oil cooler. 
The gearing according to the invention is particularly suited for the 
driving of conveyor belts, plate conveyors, bucket chains, etc. However, 
it can also be used advantageously as a cutting head drive or the like for 
excavators. 
Although various minor modifications may be suggested by those versed in 
the art, it should be understood that I wish to embody within the scope of 
the patent warranted hereon, all such embodiments as reasonably and 
properly come within the scope of my contribution to the art.