US2227841A - Means for cleaning ignition plugs - Google Patents

Description

Jan. 7, 1941. F, NALLINGER 2,227,841

MEANS FOR CLEANING IGNITION PLUGS Filed Nov. 19, 1938 lzvenfar'x Patented Jan. 7, 1941 UNITED STATES 2,227,841 MEANS FOR CLEANING IGNITION PLUGS Fritz Nallinger, Stuttgart, Germany, assignor to Daimler-Benz Aktiengesellschaft, Stuttgart- Unterturkheim, Germany Application November 19, 1938, Serial No. 241,401 In Germany December 17, 1937 6 Claims.

This invention relates to improved means for cleaning ignition plugs, and more particularly to the cleaning of said plugs during the running of an internal combustion engine having automatic 5 timing control.

An object of-this invention is to provide a simple arrangement for cleaning the spark plugs of an internal combustion engine while theengine is in operation.

Another object of this invention is to' provide means for cleaning the spark plugs of an internal combustion engine provided with an automatic timing control, while the engine is in operation, running at part or full load. 15 Still another object of this invention is to 'provide means for cleaning the spark plugs of an internal combustion engine provided with an automatic hydraulically operated ignition timing control, while the engine is in operation.

20 -A further object of this invention is to provide an arrangement for temporarily retarding the ignition timing of an internal combustion engine for-burning off and cleaning the impurities from the spark plugs, while the engine is in operation under the control of an automatic timing device.

set forth in the appended claims, and a preferredembodiment whereof is hereinafter described with 35 reference to the drawing which accompanies and forms part of the specification, wherein:

Fig. 1 is a sectional side elevation of an internal combustion engine with ignition-timing control means in accordance with the invention, the control lever being seen in the intermediate position;

Fig. 2 shows the position for advanced ignition; and

Fig. 3 shows the position for retarded ignition.

The engine a is provided with an ignition con- 45 trol device indicated generally at b, which can be adjusted for advanced and retardedignition by a lever r. A cylinder with piston c which is connected to the lubricating oil passage by a connection f, serves for the operation of the lever r.

50 The piston c is loaded by a spring I which moves to the right, that is tothe position for retarded ignition, upon the oil pressure being relieved. If i the revolution speed of the engine is so high that the oil pressure produced in the pipe 1 bythe 66 pump 9, overcomes the spring Z, .then the piston A. still further object of this invention is to is forced to the left and the lever r is set to' advanced ignition. The spring I is designed in such relation to the oil pressurethat retarded ignition is set at low revolution speed of the engine a and advanced ignition at higher speed, that-is at 5 partial and full load.

The'pump g disposed in the crank-casev is driven from the engine shaft w through suitable means such as the bevel wheels q and the shaft t. The oildrawn in from the sump u is forced through the passages h, i to the individual lubrieating points of the engine. The passage 1 serving the cylinder 0 preferably" has a throttling point It, and is branched ofi from the passage, 2 inadvance of the branches of the latter leading to the lubricating points, one of which is seen in Figure 1. From the cylinder 0 a discharge passage e leads back to the oil sump u, a control valve d which can be actuated by hand, for exampleby the Bowden wire n, being included in this passage. The discharge valve 0! is normally maintained in the closed position by a spring m, the valve arm abutting against a stop 0. If now, against the oil pressure obtaining in the cylinder space 0, retarded ignition is to be set at partial or full load, for example for the purpose of cleaning the plugs, the discharge valve dis opened temporarily by means of the Bowden wire n and the oil pressure in the cylinder space c is relieved, the oil being permitted to flow freely to the sump u. The piston c is then displaced to the right by the spring Z and the lever r is thereby set to retarded ignition. In the open position of the valve (1 its arm rests against a stop 11. After a short period of operation at partial or full load and with the ignition device set to retarded ignition, the Bowden wire it may be released again, whereupon. the valve d is reclos'ed under the action of the spring m, being arrested in the closed 40 position by the stop 0. The oil pressure is then restored to the piston c and which is again moved to the left so that the ignition device is again lever, the timing will again be automatically determined by the speed of the engine.

It will therefore be seen that I have provided a device which fulfills the objects primarily stated, and while I have shown a single embodiment of my invention, it is clear that other forms thereof may readily be provided without departing from my invention .as defined in the claims which follow.

I claim:

1. In combination, engine ignition timing means comprising a setting lever, a springreturned hydraulic piston device operatively connected with said lever, a pump driven from the engine, a pipe connection between the delivery of said pump and the hydraulic pressure side of said piston device, and a normally closed handcontrolled outlet operable for relieving hydraulic pressure on said piston device, forthe purpose described. I

-2. In combination, engine ignition timing means comprising a setting lever, a spring-return hydraulic piston motor operatively connected with said lever, a pipe connection between said motor and the delivery of the lubricating pump of the engine, and a hand-controlled pressure relief device for the cylinder of said motor.

3. In combination, engine ignition timing means comprising a. setting lever, a spring-return hydraulic piston motor operatively connected with said lever, a pipe connection between said 'means constantly operative in the closing direction upon said pressure relief device. a 5. In combination, an internal combustion engine, ignition timing means for said engine, fluid pressure responsive means for varying said timing means, a source of fluid pressure responsive to an operating condition of said engine for actuating said pressure-responsive means, and means for removing said pressure independently or any operating condition of said engine.

6. An internal combustion engine having a spark adjusting device, a lever for adjusting said device, a pressure-responsive device acting upon said lever, means for changing the pressure upon said pressure-responsive device in accordance with an operating condition of said engine, and means for relieving the pressure upon said pressure-responsive device independently of any operating condition of said engine.

FRITZ NALLINGER.

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