1. The invention:
Double cardan joint
- The problem
solved: The
main aim was to create a drive for the coupling of two shafts having
different shaft angle with a simple mechanism where the driving and
driven shafts have always the same angular velocity.
-
Definition:
The double cardan joint is
suitable for the coupling of two shafts where the two shafts can have a
larger shaft angle than that of the traditional drives and, the angular
velocities of the driving and the driven shafts are always the same.
-
Presentation: This double cardan joint compensates the varying
deviation angle between two shafts. Within a drive line the connection of
the two cardan joints in series is evidently advantageous, since due to
their co-action the angular region is doubled and, in addition, the
resulting driving movement also becomes even. This last effect is true only
if the angular deviation between the driving and driven shafts is evenly
distributed by the two cardan joints. This requirement can be realised in a
simple way only in case of fixed position cardan joints, while in case of
two cardan joints that are connected in series and where the deviation
angle between the two shafts is varying in every moment it is required to
build in an auxiliary mechanism. The characteristics of the present
solution is that the two cardan joints are connected to each other through
a double arm hinge-joint mechanism, instead of an intermediate shaft.
The arms of the hinge-joint
mechanism are embedded with bearings into the respective shafts of the two
cardan crosses. This simple mechanism automatically divides exactly in two
any actual angular deviation between the shafts and, as a result, both the
driving and driven shafts have always an equal angular velocity. An
auxiliary moving frame determines the position of the crossing point of
the two axis of revolution for both the driving and driven shafts. The
mechanism can also precisely be balanced even in case of high operating
speeds with counterweights and, at the same time, it is still operating in
a deviation angle range that is twice as much as that of a single cardan
joint and a more compact construction can be built-up as that of a double
cardan joint where these are connected to each other with an intermediate
shaft. Its lubrication and maintenance requirements are modest because it
is composed of the same elements as that of a simple cardan joint.
-
Application:
It can be used to replace
synchronous joints (e.g.: Rzeppa, Bendix, etc.) in the machine and vehicle
industry.
-
Advantages:
It
allows a higher shaft angle range than that of the single cardan joint,
with low friction, noiseless operation and low lubrication requirement in a
way that the angular velocity of the driving and the driven shafts are the
same in any moment. Its construction is simple and, thus, it can cheaply
and easily be manufactured and dimensioned for versatile use.
-
Stage of development:
Prototype is available.
-
Available documentation:
For
request
2. The inventor:
-
Name: Nádas,
Béla dr.
-
Introduction:
The inventor lives in
Budapest, he is 50 years old, he is a specialist in internal medicine. As a
HOBBY, for amusement and in his free time he is interested in and deals
with the technical questions and the mechanical engineering. He has various
inventions.
3. The
protection:
-
Form:
patent application (Reg. no.: P0203250)
-
Priority: 30 September, 2002.
- Countries:
- Owner
of patent: Inventor
4. Business
purpose: The inventor should like to
sell the patent rights.
5. Contact:
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