US1820858A - Sparking device - Google Patents

Description

Aug. 25, 1931. F. HUBER SPARKING DEVICE Filed Jan. 9, 1951 2 Sheets-Sheet l INVENTU F\:

1r ATFEI NEV.

Aug.25, 1931. F. HUBER 1,820,858-

SPARKING DEVICE Fi led Jan. 9, 1951 2 Sheets-Sheet 2 with;

i for light and heavy oil and of their Patented Aug. 25, 1931* UNITED STATES FRITZ HUBER, OF MANNHEIM,'GERMANY, ASSIGNOR TO GESELLSCHAFT, OF MANNHEIM, GERMANY SPARKING DEVICE Application filed January 9, 1931, Serial No. 507,551, and in Germany March 6, 1929, and January 2, 1930.

The present invention relates to a sparking device for starting, especially in tractors, hot bulb engines of the two-cycle type which are started by moving the flywheel several times to and fro until the necessary compression has been produced. As is generally known, it is not so important in which direction machines of this class are started. Should they start, for instance, in a direction of rotation opposite to the one desired, they are permitted to run idle until the bulb is heated to such an extent that the machine will continue working on heavy oil, whereupon the fuel is shut off .until the impulse given by the flywheel becomes too weak for a co-mplete rotation. The moment the flywheel goes back gas is given again, and the machine will move in the direction wanted. The invention consists in starting a ho bulb engine normally running on heavy oil with light oil brought to ignition at a spark plug provided in the hot'bulb and producing continuous sparks in rapid succession by means of an electric device. The electric device adapted to produce, in connection with the spark plug, continuous sparks in rapid succession may comprise a high speed mag-- net apparatus or a battery combined with a sparking coil, condenser, and buzzer.

If the continuous sparks are. produced by means of I magnet apparatus, it may be driven directly by the flywheel 01' the engine in order to attain a high speed.

One embodiment of the invention is shown in the accompanying drawings, in Which Figure 1 is a total view of the invention; Fig. 2, a detail View seen in the longitudinal direction of the machine; Figs. '3 and 4 are, respectively, a side and a top View of the pumps drive; and Fig. 5 is a sectional view of the cylinder head.

Referring to the drawing, a is the tractor, 7) are the fuel pumps, 0 is the cylinder head, (Z a heavy oil nozzle, 0 a light oil nozzle, Z the igniting unit, 61 the pump for heavy oil, and b2 the pump for light oil.

The two pumps are controlled by the lever Z: by means of which theshaft to can be turned. Firmly connected with the shaft to are the eccentricmil and the lever 102. The lever 103 is rotatably disposed on the eccentric wl, and the key 104 depends from the lever e02.

The pumps are driven by the eccentric 1' disposed on the main shaft of the motor and HEINRICH LANZ AKTIEN- moving, by means of the eccentric rod 171, I

the plunger 12 for the heavy oil pump 61 and, by means of the eccentric rod 7 3, the lever 80?, for the plunger 14 of the light oil pump 62.

The key or wedge wet is arranged between the plunger T2 and the piston 61 so as to increase, or reduce to zero, the stroke of the ump by raising and lowering the key 804.

y moving the eccentric wl by means of the shaft '10, the lever 103 can be brought into or out of engagement of the light oil pump 62.

The elements forming the groups 80 and r are adjusted relative to the lever k in such a way that, according to the central or end positions of the latter, either one or the other pump or none of them is operated. The heavy oil is injected in the known manner during the first half of the compression stroke at the end of which it is ignited. The light oil, however, is injected onlytowards the end of the compression stroke.

.The igniting element often employed in similar devices is a strong helically wound wire heated by accumulator current, the accumulator being supplied by a dynamo provided in the tractor. The purpose of such an arrangement is to make a small dynamo do corresponding to the power of the tractor.

According to the invention, the permanently glowing strong wire in this arrangement is replaced by a spark plug in order to reduce the consumption of electrical energy still more. However, normal spark plug operation is unsuited for starting heavy oil engines onlight oil for the reason that the time of ignition and the timing of injecting the light oil cannot be harmonized in the same manner as in internal combustion engines and lacks the requisite accuracy. In the modification shown in the drawings a high tension magnet apparatus operated at a high speed of approximately 4000 revolutions per minute is employed so as to insure a rapid with the plunger 14 i succession of sparks at the plug and abso- .time the fuel -is injected, i.

shown in Fig. 1, it

ignition no matterat what e., the speed of the magnet outfit is a multiple of that of the crankshaft, and, during the injection period, a large number ofsparks jumps over all the time While in the usual kind of spark plug lute certainty of ignition sparks jump over only at the mo-.

ment of in ection.

The sparks at the plug serve only for igniting the light oil'to preheat the bulb, and if the bulb is sufliciently heated'to be capable of igniting heavy oil, a change is made to the latter. In the modification shown a control device is provided which turns on the heavy oil pump "and stops the magnet apparatus. According to Figs. 1 and 2, the magne't apparatus m can be rotated with its base 'about a fixed point m1 and is operated by a frictiondisc m2 when the latter rests on the flywheel n. With the magnet apparatus m a roll m3 is connected which rests on a. cam 701 of the lever 10. If the lever is is in the left-hand position shown in Fig. 1, the friction disc m2 rests on the flywheel n andis held thereto by the spring m4. If the lever is is pressed into the right-hand position lifts off the magnet from the flywheel n by means of the cam 701. The left-hand position of the lever is corresponds therefore to the starting position of the light oil pump and the right-hand position, to heavy oil fuelling, so that, when starting the light oil pump, the lever k actuates the magnet apparatus, and stops it when the light oil pump is rendered inoperative.

., condenser,

'ment is provided witha dynamo,

. Instead 'of a high speed magnet apparatus a battery in connection with a sparking coil,

and buzzer maybe employed. Being used only for-the brief starting time, the battery may be small and handy so as to facilitate removal and charging at some other place or, if the vehicle having this arrangeit may be charged bythe latter. In view of the description given above it is thought that any further explanation of the construction and operation of such a modification is unnecessary.

It is pointed out in particular that the well-known cell ignition in four-stroke engines has nothing to do with the present invention which relates to two-stroke engines using crude oil. In four-stroke engines, there is always'an interrupter for regulating the time of ignition while, in contrast therewith, it is impossible to speak of a definite time of ignition in connection with the present invention.

I claim 1. In a two cycle heavy oil engine, means for injecting light oil during starting, a

spark plug arranged for igniting the injected l ght oil, electric means for producing a contlnuou's rapid scccession of sparks at the 2. In a two cycle heavy oil engine, means for injecting light oil during starting, a spark plug adapted to ignite the injected light oil, electric means for producing a continuous rapid succession of sparks at the spark plug, means for injecting heavy oil, and a single means operable to substantially simultaneously render the light oil injecting means and electric means inoperative and to render the heavy oil injecting means operative.

3. In a two cycle heavy oil engine, means for injecting light oil during starting, a spark plug adapted to ignite the injected light oil, electric means for producing a continuous rapid succession of sparks at the spark plug, means for injecting heavy oil, and a single means operable upon one movement to substantially simultaneously render the light oil injecting means and electric means inoperative and to render the heavy oil injecting means operative.

4. Ina two cycle heavy oil engine, a pump for supplying light oil to the engine for starting, a pump for supplying heavy oil to the engine, controllable driving connections for saidpumps, a spark plug arranging for igniting the light oil, electric means for producing a continuous rapid succession of sparks at the spark plug, and a single means operable to substantially simultaneously interrupt the driving connections to the light oil pump. and throw out said electric means and to complete the driving connections to the heavy oil pump.

In testimony whereof I have aflixed my

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