US2058401A - Engine control - Google Patents

Description

'R. BLUE ENGINE CONTROL Oct. 27, 1936.

Filed Feb. 16, 1935 Patented Oct. 27, 1936 PATENT OFFlCE ENGINE CONTROL Ralph Blue. Waukegan, Ill., assignor to Johnson Motor Company, Waukegan, Ill., a corporation of Delaware Application mm, 16, 1935, Serial N... 6,806

8 Claims. (01. 123-98) This invention relates in general to an internal combustion engine and has more particular reference to the synchronous'or co-incidental control of an exhaust cut-out with the carbureter throttle and the spark control of a motor of this kind.

A further object of the invention is in the provision of means for manually operating the throttle only when the controlling mechanism is in a predetermined position.

A still further object of the invention is in the provision of an exhaust cut-out in connection with a carbureter throttle.

In the accompanying drawing illustrating a preferred embodiment of the invention,

Fig. 1 is a side elevation with a portion in section of the power head of an internal combustion engine embodying the invention;

Fig. 2 is. a plan view of the controlling mech- 2 anism shown in Fig. 1 and with the spark advance mechanism shown in broken outline; and

Fig. 3 is a detail of the controlling mechanism in another position.

It is customary to have separate controlling 25 means for the spark advance and for the carbureter in certain types of internal combustion engines and sometimes these parts are connected for joint or synchronous operation. The present invention relates to an ex- 30 haust relief valve which is controlled with the carbureter so that when the engine is first started or is operated at low speed, the exhaust cut-out may be automatically opened to relieve any back pressure on the mufller, and thus interfere to starting, but is automatically closed as the engine is speeded up for automatically running conditions. After the motor is running satisfactorily provision is made for keeping the exhaust cutout closed if desired.

This invention is described more particularly in connection with the power head of an internal combustion engine of an outboard motor in which the engine exhaust is discharged through suitable piping connections beneath the surface of the water, thereby silencing the exhaust. In starting such a motor a closed exhaust tube may create such a back pressure on the mufller that it is difficult to start the engine and the present exhaust relief is provided and automatically operated to insure an atmospheric opening from the carbureter in the starting position of the spark controlling means and the'carbureter.

Referring now more particularly to the drawing, a power head for the internal combustion engine of an outboard motor is shown in the drawing and comprises an engine 5, a muiller 6, a mufller discharge 1 leading therefrom, and having relief openings 8 controlled by a perforated valve disc 9 mounted on a rotatable stem l0 and held against the outside of the openings by a spring ll. A'crank arm I2 is attached by a pin l3 to the stem Ill and has a crank portion l4 at its upper end by which the plate 9 is rotated so that perforations l 5 thereof may be moved into or out of register with the relief openings 8.

Positioned above the engine and mufller is a fuel supply tank having a pipe 2| leading therefrom to a carbureter body 22 which controls the supply of fuel to the motor crank case 23 in any well known manner by means of a throttle valve having a controlling valve stem 24 extending through the top thereof and to which a controlling arm 25 is adjustably secured by a fastening screw 26.

Mounted at the upper end of the engine shaft is a magneto 3| having a movable control plate 32 with an extending control arm 33 by means of which the plate is moved between its high and low speed conditions as indicated in Fig. 2, and adjusted to any intermediate position, depending upon the speed desired. Upon this plate 32 is a n spark coil 34, an ignition breaker arm 35, and the shaft 30 is provided with a cam portion 36 for actuating the breaker arm to produce an ignition spark for the engine, in a well known manner.

The above mentioned parts are common to all power, heads of this type with the possible exception of the exhaust relief openings of the plate 9 and its operating crank, and the present in-- vention consists more particularly in the provision of a link 40 connected at one end to a pivot 4| extending from the bottom of the plate 32 and connected at its other end by a pivot screw 42 to the extremity of the carbureter control arm 25. Also connected to the carbureter arm 25 is a link 44 having a slot 45 therein engaged by a headed screw 46 inserted through the slot 45 and into the arm 25 intermediate the ends of the arm 25. One end of the link 44 is adjacent the outer end of the slot 45 and has a turned-up extremity 41 which provides a, finger engaging portion for moving the link 44. The other end of the link has a perforation for engaging the upper crank end l4 for moving the exhaust cut-out and a small cotter pin 48 is commonly inserted through the upper .extremityof the crank portion I4 to prevent disengagement of the parts. The connection of these controlling parts is such that the exhaust cut-out is open to the atill mosphere through the perforations I! in the plate 8, the carbureter throttle is nearly closed and the ignition breaker is in the retarding position for starting the engine, and for operating it at very slow speed.

The engine is started by means of a rope or cable wound in engagement with a starter plate 50 at the upper end of ,the engine shaft and as soon as the engine is in o ration it may be accelerated by moving the andle 33 from the retard position. The slot 45 in the link it permits a considerable accelerating movement of the throttle arm 25 before it is engaged to close the exhaust cut-out openings 8, but in the normal and faster running positions the exhaust cutout is closed so that the exhaust is discharged away from the engine, and in the case of an out board motor, beneath the surface of the water.

In running the engine at very slow speed and with the controlling parts in the positions as shown in full lines in Fig. 2, the openings of the cut-out plate 9 will register with the exhaust cut-out openings 8. At this time the cut-out control link 44 may be pressed inwardly because of the slot 45 which will rotate the crank arm I! for the exhaust cut-out to a position approximately as shown in Fig. 3 in which the openings i5 of the plate 8 will be moved away from the cut-out openings 8, thereby closing the exhaust cut-out. Likewise when the carbureter controlling arm 25 is in its extreme advanced position as shown by the broken outline in Fig. 2, in which the pivoting screw 46 will beat the outer end of the slot 45 of the cut-out control arm 44, closing the exhaust cut-out, the independent movement of the link outwardly by engaging the end projection 41 will move the throttle crank l2 sumciently to register one or more of the perforations l5 with the exhaust openings 8. This last condition however, is not so necessary or useful as the movement illustrated for slow speed operation by Fig. 3.

With this construction the movement both of the throttle and the exhaust cut-out is dependent upon the spark control and the positioning of all of them is dependent upon the operating speed of the engine. A proper co-ordination of parts is thus provided which makes the operation of all of them uniform, synchronous and easily controlled. With this connection of parts an engine is started more easily and more effectively, and by providing for a separate variation of the exhaust cut-out, diflerent running or operatingconditions can be covered.

Iclaim: 1. An internal combustion engine having an engine exhaust with an exhaust cut-out valve movable between open and closed positions, a carbureter with a throttle valve movable between open and closed positions and movable ignition means for advancing and retarding the spark to the engine, of a synchronous control comprising meansconnecting the movable ignition means, the carbureter throttle and the exhaust cut-out for synchronous operation in a direction to open the cut-out valve, close the throttle valve, and retard the spark.

2. In an internal combustion engine having a throttle for governing the fuel supply, and an exhaust pipe with an atmospheric cut-out therein, the combination of means connecting the throttle and the cutout for simultaneous operation and including a lost motion connection such that when the throttle is in slow speed position the cut-out will-be open and when the throttle is in high speed position the cut-out will be closed,

the throttle being variable for other engine speeds without affecting the cut-out.

3. The combination with an internal combustion engine, of an exhaust therefor having a movable atmospheric cut-out, a fuel supply means for the engine having a movable throttle, movable spark timing means, a link connecting the spark timing means and the throttle controlling means for operating them in unison, and means forming a lost motion connection with. the throttle means for delaying the actuation of the exhaust cut-out in a closing direction following the initial movement of the link in a spark advancing and throttle opening direction.

4. A structure in accordance with claim 3 in which the exhaust cut-out operatingmeans comprises a slotted link and a projection on the throttle controlling means engaging loosely in the slot so that the link can be moved independently of. the throttle for operating the exhaust cut-out in a direction permitted by the slot in the link.

5. The combination with an internal combustion engine having a speed control comprising fuel supply means including a movable throttle and spark timing means including a movable member connected for joint operation with the throttle, of an exhaust having a movable atmospheric cut-out and means including a crank arm and a link in connection therewith having a lost motion connection with the speed controlling means for opening the cut-out in starting the engine and at low speed and for closing the cut-out when the engine has obtained a predetermined speed. I

6. The combination with an internal combustion engine, of an exhaust therefor, including an exhaust member having atmospheric openings, a valve having openings to registerwith the atmospheric openings, means to operate the valve, speed controlling means for the engine, and a connection between the speed controlling means and the valve controlling means comprising a link having a pin and slot connection at one end adapting it to bemoved independentlyof the speed controlling means for varying the operation of the cut-out from that produced by the speed controlling means.

7. In an internal engine, a fuel supply throttle having a movable controlling arm, an exhaust having an atmospheric outlet and a movable valve for controlling the outlet, a crank member for moving the valve, and a link connection between the crank member and the throttle arm for operating them in unison, the link member having a slotted connection with the arm for moving the crank member manually in a direction opposite to the position in which it is normally moved by the throttle arm.

8. In an internal combustion engine with a movable speed controlling means therefor, of an exhaust for the engine having a cut-out, a valve for controlling the cut-out and means connecting the valve to the speed controlling means for opening the cut-out at low speed and. for closing

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