1. * GB780057 (A)
Description: GB780057 (A) ? 1957-07-31
Improvements in or relating to torque-limiting couplings
Description of GB780057 (A)
PATENT SPECIFICATION
Date of Application and filing Complete Specification: Nov. 22, 1955.
780,057 No. 33452155.
Application made in Germany on March 23, 1955.
Complete Specification Published: July 31, 1957.
Index at acceptance:-Class 80(2), C1B, S2(B2:D1).
International Classification:-FO6d.
COMPLETE SPECIFICATION
Improvements in or relating to Torque-limiting Couplings I, KURT
SCHROTER, of 3a Strassen, Herkenrath bei Bergisch-Gladback, Germany,
of German nationality, do hereby declare the invention, for which I
pray that a patent may be granted to me, and the method by which it is
to be performed, to be particularly described in and by the following
statement:The invention relates to a torque-limiting coupling.
According to the present invention there is provided a torque-limiting
coupling with rollable drive bodies displaceable parallel to the axis
of the coupling against spring pressure and serving for transmitting
motion between two coupling members, wherein the first of the coupling
members is constructed as the internal ring of an inclined bearing
employing rollable bodies, on which bearing the second coupling member
is rotatably car-, ried and axially supported, and wherein the drive
bodies provide positive connection by engaging in depressions in part
of one of the coupling members.
-The term "rollable drive bodies" as used herein is intended to
include balls and rollers.
For a better understanding of the invention and the method of carrying
the same into effect, reference will now be made to the accompanying
drawings, in which:
Fig. 1 is a side view, partly in section, of a torque-limiting
coupling, and also diagrammatically illustrates a running track for

2. the 35rolling drive bodies; Fig. 2 is a side view partly in section,
of a modified form of coupling as regards connection to a splined
shaft spigot; and Fig. 3 is a cross-sectional view along A-A of Fig.
2.
In all the figures adjustable projections 1 serve for adjustably
positioning plate springs 8. In Fig. 1 the adjustable projection 1 is
formed by a flange projection on a splined shaft spigot 17, whereon an
internal part or r e vhub 11 of the coupling is secured. In Fig.
2 the projection is formed by an adjusting nut 1. This nut 1 is
screwed on to the internal part 11 of the coupling, which part 11
takes the form of a hub, and simultaneously 50 forms an axial securing
means on the splined shaft spigot 17 with the help of a locking pin 2.
The locking pin 2 is positioned in a transverse bore in the adjusting
nut 1, and is axially displaceable in the bore against 55 the action
of a spring 3. In the locking position shown in Fig. 3, the pin 2 is
held by the spring 3, and engages in an annular groove 18 in the
splined shaft spigot 17. The locking pin 2 has a cut-out which frees
the axial 60 locking on the splined shaft spigot 17 when the locking
pin 2 is displaced in the bore against the action of the spring 3. The
coupling can then be displaced on the splined shaft spigot 17 or
removed therefrom. The 65 adjusting nut 1 has a further transverse
bore on the opposite side. A stop pin 5 is so inserted into this, that
it also cuts the part 4 of the hub 11. This prevents the nut 1 from
being put out of adjustment. A securing wire 70 :6 with a lead seal 7
protects the stop pin against falling out and unauthorised removal.
The limiting torque of the coupling depends on the position of the
adjusting nut, and is given by a number stamped into the 75 lead seal.
The construction described makes it possible to see at once whether
unauthorised alteration has been made to the adjustment of limiting
torque.
The plate spring 8 presses spherical rolling 8D drive bodies 16 into
depressions in an annular plate 9, and simultaneously holds the bodies
16 in the guide bores in a flange-like projection 12 on the coupling
hub 11. The plate 9 forms the external ring of a ball bear- 8j ing 10
and is bolted to an articulated fork 15.
The ball bearing 10 supports the plate 9 and hub 11 against all mutual
axial and radial forces, and allows the plate 9 and fork 15 to be
rotated as desired in relation to the hub. 9g 780,057 The ball bearing
is externally closed by a seal 14. An elastic oil-resisting protective
cap 13 (Fig. 1) with two sealing lips is inserted between the
peripheral edges of the plate spring 8 and the annular plate 9, and
surrounds the projection 12, and externally seals the bodies 16.
The running track for the bodies 16 diagrammatically illustrated in
the lower part of Fig. 1 is arranged concentrically with the axis of

3. the shaft, and is provided with depressions. This ensures longer life
for the annular plate 9, because the spherical bodies 16 have a large
area of contact, and end pressure on the abutment is small. The
running track can be so constructed that the balls 16 have an abutment
in one direction of movement only. This causes a freewheel action,
which is very important for a number of agricultural machines with
rapidly rotating parts. If, for example, a winch or drum in an
agricultural machine is accelerated to high speed, and the speed of
the driving shaft subsequently falls, very heavy stresses arise 25in
the transmission members, and this is avoided by the construction of
the running track described.
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