Improvements in Balancing Devices for Power Engines with Thrust Crank Driving.
Year: 1897

page_text: Date of Application, 21st Dec.,
1897
Complete Specification Left, 21st Sept., 1898-Accepted, 26th Nov.,
1898
Improvements in Balancing Devices for Power Engines with
Thrust Crank Driving.
I, ROBERT CONRAD, Engineer, of Berlin, Ackerstreet, 63, Germany, do hereby
declare the nature of this invention to be as follows:-
Up to now it has been the general endeavour to prevent in movable power
installations the commotion produced by the acceleration of the working piston and
the guide rod (the consequences of which partially are the sensible horizontal and
partially vertical vibrations of the engine and its subconstructions) these drawbacks
have been sougth to be prevented by the fact that the crank or the fly wheel was
provided with corresponding counterweights. But this way of keeping the
movable masses as much as possible in balance, leaves, as is well known, on a stroke
part of the length of the guide rod, say, for instance, in a six times length on one
sixth part, the alternating masses unbalanced. Hereto must still be added, that
the faster the engine runs, the more unfavourably the centrifugal power of the
unbalanced masses operates on the stability of the engine. The deficiency of a
complete equilibrium offers therefore great difficulties in the construction of
movable and automobile power engines if carburet of hydrogen working power is
chosen, as here a larger number of revolutious of the motor is unavoidable and as
the installation costs would considerably be increased by the increase of the weight
of the fly wheel and carriage-which measures would indeed make the said
drawbacks more tolerable.
The subject of the present invention now forms a device by which, without
having recourse to the said measures, a novel kind of balancing the movable masses
is obtained, and which, as compared with the one known up to now, proves
by far the more perfect one.
In the annexed drawing there are shown as examples of carrying the invention
into effect:
Fig. 1 is the vertical section.
Fig. 2 the view from on high of a motor suspended on a frame.
Figs. 3 and 4 a side view and a view from on high of another modification of the
invention.
The cylinder a, piston b, guide rod c and the crank shaft
may represent the
motion organs of a known motor. According to Figs. 1 and 2 there is now a
weight-body e sliding freely to and fro along a bar el by means of guide
rods ff engaging at the points g, g¹, as it were, as if the body e were a second
If the counter weight
piston b, located on the opposite side of the crank shaft.
for the rotating parts of the engine has been fixed in the gudgeons g¹, if half
the weight of the guide rod c conforms in any point with the weight of the guide
rods ff, and if finally the weigth of the body e is the same as that of the piston b,
a complete balancing of the engine will take place. If the crank radius of the
gudgeons be chosen n-times larger or smaller than the crank radius d, the
weight of e will be larger or smaller in an inverse proportion to this size.

page_text: By the Figs. 3 and 4 there is shown a device in which the balance weigth e has
to make oscillating motions around a fixed point e²; the actuating takes place by
the eccentrich, whose rod h¹ controls the guide d', uninfluenced by the amplitude
of oscillation, which is here chosen smaller than the piston stroke, the weight e
will oscillate synchronously with the piston b, but in a direction opposite to the
motion of the latter, the accelerated masses of b and c will consequently be
maintained in balance, provided the body e gets an increase of weight corresponding
to the reduction of the way.
Dated this 15th Tonaw
1007
I
Improvements in Balancing Devices for Power Engines with
Thrust Crank Driving.
ROBERT CONRAD, Engeneer, Berlin, N., Acker Strasse, 68, do hereby declare the
nature of this invention and in what manner the same is to be performed, to be
particularly described and ascertained in and by the following statement :-
Up to now it has been the general endeavour to prevent in movable power
installations the commotion produced by the acceleration of the working piston and
the connecting rod (the sensible horizontal and partially vertical vibrations of the
engine and its foundation) these drawbacks have been sought to be prevented by
the fact that the crank or the fly wheel was provided with corresponding counter-
weights. But this way of keeping the movable masses as much as possible in balance,
leaves, as is well known, part of the length of the connecting rod, say, for instance,
in a six times length on one sixth part, the alternating masses unbalanced. Hereto
must still be added, that the faster the engine runs, the more emfavourably the
centrifugal power of the unbalanced masses operates on the stability of the engine.
The deficiency of a complete equilibrium offers therefore great difficulties in the
construction of movable and automobile power engines if carburet of hydrogen working
power is chosen, as here a larger number of revolutions of the motor is unavoidable
and as the installation costs would considerably be increased by the increase of the
weight of the fly wheel and carriage-which measures would indeed make the said
drawbacks more tolerable..
The subject of the present invention now forms a device by which, without
having recourse to the said measures, a novel kind of balancing the movable
masses is obtained, and which, as compared with the one known up to now, proves
by far the more perfect one.
In the drawing, filed with my Provisional Specification, there are shown as
examples of carrying the invention into effect:
Fig. 1 is the vertical section
Fig. 2 the plan of a motor suspended on a frame,
Fig. 3 and 4 a side view and a plan of another modification of the invention.
The cylinder a, piston b, connecting rod c, and the crank shaft d, may represent
the motion organs of a known motor. According to Fig. 1 and 2 there is now a
weight body e sliding freely to and fro along a bar e' by means of connecting
rods ff engaging at the points y g', as it were, as if the body e were a second
piston b, located on the opposite side of the crank shaft. If the rotating parts of
the engine are balanced by means of the formation of the cranks g g¹, if further

page_text: half the weight of the connecting rod e conforms in any point with the weight of the
connecting rods ff, and if finally the weight of the body e is the same as that of
the piston b, a complete balancing of the engine will take place. If the radius of the
cranks gg¹ be chosen n times larger or smaller than the crank radius d, the
weight of e will be larger or smaller in an inverse proportion to this size.
By Fig. 3 and 4 there is shown a device in which the balance weight e has to
make oscillating motions around a fixed point e; the actuating takes place by the
eccentric h, whose rod h¹ controls the guide d', uninfluenced by the amplitudo of
oscillation, which is here chosen smaller than the piston stroke, the weight e will
oscillate synchronously with the piston b, but in a direction opposite to the motion
of the latter, the accelerated masses of band e will consequently be maintained in
balance, provided the body e gets an increase of weight corresponding to the
reduction of the way.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is
In a balancing device for power engines with thrust crank driving the
combination of a balance weight e having the same amplitude of motion as the
engine piston as a mass, but in au inverse sense, with the crank shaft by means of
an especial crank or an eccentric, and the said balancing weight e further in
combination with one or more rods e¹ or with a lever oscillating around a fixed
point e².