FIELD OF THE INVENTION
The present invention relates to a power transmission system and ,in particular, to a
power transmission system adapted to increase the efficiency of power transmission
while transferring power from a power generating source to a power receiving
source. Preferably, the power transmission system of the invention would favour
transferring power from a power generating source such as a source
sprocket/pulley/gear/sheave or the like (hereinafter referred to as 'source SPGS') to
a recipient sprocket/pulley/gear/sheave or the like (hereinafter referred to as
'recipient SPGS'). Importantly, the power transmission system of the invention is
directed to save power which otherwise usually get lost due to the limitations of
dimension of the diameter of the recipient SPGS vis-a-avis the dimension of the
diameter of the source SPGS required under existing system of power transmission
system. Advantageously, the present power transmission system of the invention
would while on one hand continue to provide for the working dimensional relation
between a recipient SPGS and a source SPGS on the other hand ensure that the loss
of power from the source SPGS to the recipient SPGS is controlled so as to achieve in
valuable saving of the power loss during transmission of power and in fact save
valuable power which would otherwise been wasted as transmission loss and in the
process improve the performance of such efficient power transmission system for
variety of end use and applications.
BACKGROUND ART
It is well known that a conventional power transfer mechanism involves the transfer
of power from the source generating such power to a recipient through
pulley/sprocket/gear/sheave assembly.

Usually such power transmission mechanism involve a source
sprocket/pulley/gear/sheave or the like and a recipient sprocket/pulley/gear/sheave
where the diameter of the source SPGS is always greater than the diameter of the
recipient SPGS. Such dimensional limitations of the source SPGS vis-a-vis the
recipient SPGS and , in particular, the required diameter of the recipient SPGS being
smaller compared to the diameter of the source SPGS is directed to gain higher
rotational speed at the axel of the recipient SPGS compared to that of the source
SPGS.
However, while such afore discussed diametric limitations of the source SPGS and
the recipient SPGS does provide for gain of higher rotational speed at the axel of the
recipient SPGS compared to the source SPGS, the magnitude of the power that get
transferred from the source to the recipient equals to the power delivered by the
source SPGS multiplied by the ratio of diameter of the recipient SPGS and source
SPGS. Thus, considering that the recipient SPGS is required to have much less
diameter than the source SPGS, the recipient SPGS receives less power than what is
transmitted by the source SPGS based on such diametric limitation of the recipient
SPGS.
Therefore, in a conventional power transmission system where the diameter of the
receiving pulley/sprocket/gear/sheave is smaller than that of the source
pulley/sprocket/gear/sheave for achieving higher speed at the receiver end
compared to that of the source end, the transmission is subject to power loss in the
ratio of the diameter of the receiver to that of the source.

OBJECTS OF THE INVENTION
It is thus the basic object of the present invention to provide for a power
transmission system such as those involving said source SPGS and recipient SPGS
which would on one hand achieve the desired higher speed at the receiver end
compared to that of the source end and on the other hand adapted to favour power
saving which otherwise would have lost due to the reduced diameter of the receiving
system compared to the power generating/source system.
A further object of the present invention is directed to improving the efficiency of
transmission system such as those involving source SPGS and recipient SPGS by way
of saving the loss of power during transmission of power and thereby benefit cost
effective and more efficient end use and application of such power generating
systems for varieties of end use and applications.
Yet further object of the present invention is directed to improve the power
utilization in power transmission system such as those involving said source SPGS
and recipient SPGS maintaining the same diametric ratio of the recipient SPGS and
source SPGS to ensure increased speed and at the same time gaining almost double
the torque at the axel of the recipient SPGS.
BRIEF DESCRIPTION OF THE NATURE INVENTION
The present invention is thus directed to a power transmission systems wherein
power is transferred from the source to the receiver in a belt - pulley, chain -
sprocket, gear - gear or belt - sheave type power transmission systems. In such
systems the diameter of the receiving pulley, sprocket, gear or sheave (receiver) is

smaller than that of the source pulley, sprocket, gear or sheave (source) so as to
achieve higher speed at the receiver end compared to that at the source end.
According to the basic object of the present invention, in order to on one hand
achieve and maintain the above said higher speed at the receiver end compared to
that at the source end and ,importantly, on other hand achieve power saving that
otherwise would have been lost due to the reduced diameter of the receiving system
compared to the source system, the axel from the center of the receiver system
(recipient SPGS) is shifted to the perimeter of the receiver system (recipient SPGS)
and located opposite to the point of contact of the belt, chain, gear etc. to the
recipient SPGS.
Importantly, the above disclosed shift of axel in the recipient SPGS in the present
system of the invention is provided such that the effective distance between the line
of action of the force and the axel goes up to almost double compared to the
distance between the force and the center of the receiver which is usually provided in
existing systems of power transmission.
Advantageously, since the above selective provision of the axel near the perimeter of
the receiver provides for achieving almost double the distance between the force and
the axel, the available torque at the receiver axel also goes up to almost double. It is
thus possible by way of such an arrangement of power transmission system to
achieve power in the receiving end of almost double that which can be achieved in
the existing power transmission system under similar situation.

The invention is described hereunder in greater detail in relation to non-limiting
exemplary illustrations as per the following accompanying figures:
BRIEF DESCRIPTION OF THE ACCOMPANYING FIGURES
Figures 1A & 1B: illustrate a standard mechanism for transferring power from a
source SPGS to a recipient SPGS;
Figure 2: illustrates the arrangement of the recipient SPGS in particular the location
of the axel at the periphery adapted to achieve power saving in spite of maintaining
reduced diameter of the recipient SPGS with respect to the source SPGS; and
Figure 3: illustrates by way of a comparative illustration, the provision of the
recipient SPGS with the center of the axel concentric to the center of the recipient
sprocket/pulley/gear and the provision of recipient SPGS with axel towards the
perimeter away from the center of the sprocket/pulley/gear in accordance with the
present transmission system of the invention.
Reference is first invited to accompanying figures 1A & 1B which shows the standard
mechanism provided for transferring power from a source SPGS (which receives
power from the shaft or axel that rotates it) to the recipient SPGS. As clearly
illustrated in the figures in such conventional power transmission systems, the
diameter of the recipient SPGS is smaller compared to the diameter of the source
SPGS so as to gain higher rotational speed at the axel of the recipient SPGS
compared to that of the source SPGS. However, as already discussed hereinbefore,
in such conventional power transmission system the torque at the recipient SPGS get

reduced compared to that of the source SPGS by the ratio of their diameter. Thus,
under such conventional system power is lost in the ratio of the diameter of the
receiver to that of the source.
In accordance with the objects of the invention there is thus provided for a power
transmission system involving similar source SPGS and recipient SPGS maintaining
same ratio of their diameters and yet achieve almost double the torque at the axel of
the recipient SPGS thereby avoiding unwanted power loss during transmission from
the source SPGS to the recipient SPGS.
As clearly illustrated in Figure 2, such advantages in the power transmission system
of the invention is achieved by way of provision of the axel of the recipient SPGS
eccentrically located opposite to the point of contact of the chain/belt etc. which
transfers power from the source SPGS to the recipient SPGS. The figure also
illustrates that the recipient SPGS according to the present system basically
comprises of two separate pieces, the inner layer L1 and outer layer L2 connected
through a third layer L3 between them. The circular inner layer L1 is rigidly fixed
with the axel located eccentrically towards the perimeter of the inner layer and outer
layer is in the form of a ring and is rotatively placed around the inner layer such
that the outer layer can freely rotate around the inner layer. A ball bearing or similar
other arrangement can be provided between the inner and outer layer so as to
minimize the friction between the surfaces of the inner and outer layers facing
towards each other. There is one crank that transfers power from the outer later L2
to the axel, which is rotatably connected to the outer layer L2 and slidingly
connected to the axel. One end of the crank is rotatively connected to the outer layer
and the other end of the crank is slidingly inserted inside a hole/groove on the axel
of the recipient SPGS so that when the outer layer of the recipient SPGS rotates, the

crank also moves alongwith it and effects transfer of power to the axel so as to
rotate the axel in same angular movement i.e. as the outer layer is rotated the crank
rotates the axel to that the power received from the source SPGS gets transferred to
the axel. Such an arrangement and selective disposition of the axel in the recipient
SPGS is adapted such that the effective distance between the force and the axel goes
up to almost double compared to the distance between the force and the center of
the receiver which is usually provided in existing systems as shown in figures 1A &
1B. Thus, since distance between the force and the axel goes up to almost double,
the available torque at the receiver axel also goes up to almost double in the power
transmission system of the invention shown in figure 2.
Reference is now invited to figure 3 which is a comparative illustration of a
conventional recipient SPGS with a centrally disposed axel and the recipient SPGS
according to the invention having the axel shifted towards the perimeter of the
recipient SPGS and away from the point of contact of the chain/belt/tooth with the
recipient SPGS. Importantly, as would be apparent from the comparative illustrations
since in the power transmission system of the invention, the axel is now shifted
towards the perimeter, the effective distance from the center of the axel to the point
at which force is exerted by the chain/belt/gear is almost equal to the diameter of
the recipient SPGS at any point of the crank although the actual diameter of the
recipient SPGS is maintained the same and lower than the source SPGS to ensure
that the increased speed is also maintained in the same ratio as that of the existing
systems while gaining double the torque at the axel of the recipient SPGS.
It is thus possible by way of the present invention to provide for a power
transmission system such as those involving said source SPGS and recipient SPGS
which would on one hand achieve the desired higher speed at the receiver end

compared to that of the source end and on the other hand adapted to favour power
saving which otherwise would have lost due to the reduced diameter of the receiving
system compared to the power generating/source system.The invention would favour
improving the power utilization in power transmission system such as those involving
said source SPGS and recipient SPGS maintaining the same diametric ratio of the
recipient SPGS and source SPGS to ensure increased speed while at the same time
gaining double the torque at the axel of the recipient SPGS.