An Improved Ignition Apparatus for Explosion Motors.
Year: 1899

page_text: Date of Application, 11th Oct., 1899.
Complete Specification Left, 11th July, 1900-Accepted, 11th Aug., 1900
An Improved Ignition Apparatus for Explosion Motors.
I, WILHELM MAYBACH, of Cannstatt, in the Kingdom of Württemberg, German
Empire, Engineer, do hereby declare the nature of this invention to be as
follows:-
In explosion motors with magneto-electric ignition the spark effecting the
ignition of the gas mixture compressed within the cylinder is produced in a
well known manner by the sudden interruption of two contacts arranged within
the compression chamber and shunt in the circuit of a small magnet o-electric
engine.
The induction current produced by the magneto-electric engine not being a
constant one, but increasing firstly and decreasing afterwards, it is evident that
for obtaining ignitions of equal intensity, the above mentioned interruption of
the contact always must take place in the same moment of the oscillating or
rotating movement of the circuit exciter. In order to employ the grea test
intensity of the current for the ignition, the contact must be interrupted in
that moment, where the circuit exciter has attained its greatest rapidity.
I attain these conditions by rendering dependant from another both the circuit
exciter and the circuit interrupting device, for which purpose I employ the
shaft of the motor or an intermediate shaft, the revolution of which is dependant
of the revolutions of the motor-shaft.
In order to make my invention more clear I beg to refer to the accompanying
drawing in which:
a illustrates the shaft of the engine or an intermediate shaft rotated from
the same.
Upon this shaft a is mounted a cam which by a lever d imparts
an oscillating movement to the armature of the magnet c arranged between the
legs of this magnet, but which is not illustrated in the drawing. A connecting
rod e is movably fixed to the lever and at its top extremity is provided with
projection k.
A pin g, insulated against the motor casing, projects into the explosion
chamber of the cylinder. The said pin is connected with the circuit exciter by
means of connecting wires f. The second contact piece is formed by a lever h
rotatably arranged within the explosion chamber. The axis of the latter pro-
jects through the wall of the casing and at the outside of the same is provided
with a second lever i, which by means of a helical spring constantly is pressed
against the adjustable pusher k of the rod e.
The shaft a rotates in the direction of the indicated arrow, thereby the cam b
raises the rod e contrary to the action of the spring m surrounding the rod e.
Simultaneously herewith the armature of the electro-magnet c is rotated and
the excited current passes through the wire f. Owing to the form of the cam b,
the lever d and the rod e effect a rocking movement under the influence of the
helical spring m. Owing to this rocking movement the pusher k fixed upon the
rod e meets the lever i and thereby draws the lever h away from the pin g.
The induction current coming from the armature, thereby suddenly is inter-

page_text: rupted and owing to the spark thus produced, the explosion mixture is ignited.
Owing to the adjustability of the pusher, the moment, at which the ignition
shall take place, exactly can be predetermined...
From the drawing it can be seen that the cam is of such a form that it
also might be rotated in reverse direction, without any mechanism of the engine
being injured thereby.
Dated this Floranth Natalian 1900
COMPLETE SPECIFICATION.
An Ir proved Ignition Apparatus for Explosion Motors.
I, WILHEIM MAYBACH, of Cannstatt, in the Kingdom of Württemberg, German
Empire, Er gineer, 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:―
well k
L
In explosion motors with magneto-electric ignition the spark effecting the
ignition
of the gas-mixture compressed within the cylinder is produced in a
nown manner by the sudden interruption of two contacts arranged within
the c ompression chamber and forming part of the circuit of a small magneto-
erect ric engine.
The induction current produced by the magneto-electric engine not being a
coistant one, but increasing firstly and decreasing afterwards, it is evident that
for obtaining ignition sparks of equal intensity, the above mentioned interrup-
tion of the contact must always take place at the same moment of the oscillating
or rotating movement of the circuit exciter. in order to employ the greatest
intensity of the current for the ignition, the contact must be interrupted in that
moment, where the circuit exciter has attained its greatest rapidity.
.I attain these conditions by rendering dependant upon each other both the circuit
exciter and the circuit interrupting device, for which purpose I employ the
shaft of the motor or an intermediate shaft, the revolution of which is dependant
of the revolutions of the motor-shaft.
In order to make my invention more clear, I refer to the drawings filed with
my Provisional Specifications, in which:
a illustrates the shaft of the engine or an intermediate shaft rotated from
the same. Upon this shaft a is mounted a cam which by a lever d imparts
an oscillating movement to the armature of the magnet c arranged between the
legs of this magnet, but which is not illustrated in the drawing. A connecting
rode is movably fixed to the lever d and at its top extremity is provided with
a projection k.
A pin g, insulated against the motor casing, projects into the explosion
chamber of the cylinder. The said pin is connected with the circuit exciter by
means of connecting wires f. The second contact piece is formed by a lever h
rotatably arranged within the explosion chamber. The axle of the lever pro-
jects through the wall of the casing and at the outside of the same is provided
with a second lever i, which by means of a helical spring constantly is pressed
against the adjustable pusher k of the rod e.
The shaft a rotates in the direction of the indicated arrow, thereby the cam b
raises the rod e contrary to the action of the spring m surrounding the rod e.
Simultaneously herewith the armature of the electro-magnet c. is rotated and
the excited current passes through the wire f. Owing to the form of the cam 6,

page_text: the levered and the rod e effect a rocking movement under the influence of the
helical spring m. Owing to this rocking movement the pusher k fixed upon the
rod e meets the lever i and thereby draws the lever h away from the pin g.
The induction current coming from the armature, thereby suddenly is inter-
rupted and owing to the spark thus produced, the explosion mixture is ignited.
Owing to the adjustability of the pusher the moment at which the ignition
shall take place, exactly can be predetermined.
From the drawing it can be seen that the cam bis of such a form that it
also might be rotated in reverse direction, without any mechanism of the engine
being injured thereby.
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
1. In an electro-magnetic ignition device for explosion engines the employ-
ment of apparatus substantially such as is herein described whereby the spark
is produced in the combustion chamber at the moment of greatest intensity.
2. In a magneto-electric ignition apparatus for explosion-motors, the combina-
tion with a cam 6 located upon the engine shaft or upon a shaft dependant from
the same, a lever d linked to the axle of the armature, a pusher k adjustably
fixed upon the rod e, a contact-pin g connected with the circuit exciter by means
of wires f and arranged to project into the explosion chamber of the motor, an
ignition lever h being in contact with the pin g, a lever i mounted upon the
axle of the lever h, the pusher & influencing the lever i, the cam effecting the
rocking movement of the mechanism, so that when the lever h is displaced from
the ping a spark is produced causing the explosion of the mixture, as set forth.
3. The complete electro-magnetic ignition device substantially as described
and illustrated in the accompanying drawing.
D
AL
111 1
1000
BOULT, WADE & KILBURN,
Agents for the Applicant.