US2518658A - Engine starting device - Google Patents

Description

Aug. 15, 1950 D. BOYCE ENGINE STARTING DEViICE 4 Sheets-Sheet 1 Filed Oct. 3, 1945 III- ' IIIII I III TO IGNITION FIG.

- INVENTOR. LEONARD D. BOYCE BY Aug. 15, 1950 Filed Oct. 3, 1945 L. D. BOYCE 2,518,658

ENGINE STARTING DEVICE 4 Sheets-Sheet 2 TO IGNITION TO IGN TION IIIIIIIIIIIIIIIIIII F'IG.5.

INVENTOR. LEONARD D. BOYCE Aug. 15, 1950 D. BOYCE 2,

ENGINE STARTING DEVICE Filed Oct. 3, 1945 4-Sheets-Sheet 5 TO IGNITION FIG,6.

FIG.9.

INVENTOR.

LEONARD D. BOYCE- Aug. 15, 1950 1.. D. BOYCE 2,518,658

v ENGINE STARTING DEVICE Filed Oct. 3, 1945 4 Sheets-Sheet 4 INVENTOR. 7 LEONARD I D. BOYCE Patented Aug. 1.5, 1950 ENGINE STARTING DEVICE Leonard D. Boyce, Maplewood, Mo., assignor to Carter Carburetor Corporation, St. Louis, Mo.,' a corporation of Delaware Application October 3, Maserati No. 620,124

' 2 Claims. (01. 123-179) This invention relates to starting devices for internal combustion engines and consists, particularly, in novel means to control the richness of the fuel mixture supplied during starting.

The present types of automatic choke carburetors embody unbalanced, thermostatic-choke valves to facilitate cold starting and warm-up of the engine. The thermostat yields to permit opening of the valve during cranking because of the direct action of suction thereon. However, I have found that it is desirable, at least in some cases, to prevent such breathing of the choke valve during cranking. Previous choke locking devices have caused movement of the choke to the fully closed position during starting, regardless of temperature. This may result in excessive richness of the mixture and loading .when a, start is made after the engine is fully or partially heated.

It is an object of the present invention to provide means for locking the choke valve in whatever position it has previously assumed upon initiation of the starting'of the engine.

It is a more detailed object to provide locking device for the choke valve which is mechanically controlled with the automatic starter button or pedal.

These objects and other more detailed objects hereafter appearing are attained by the device illustrated in the accompanying drawing in which Fig. 1 is a side view of an internal combustion engine with the invention applied thereto, the

electrical system being illustrated diagrammatically.

Fig, 2 is a vertical section showing the carburetor and choke control considerably enlarged.

Fig. 3 is a vertical section on line 3--3 of Fig. 2.

Fig. 4 is a view similar to Fig. 1 but showing a modification.

Fig. 5 is a similar view showing still another modification.

, Fig.6 is a similar view showing another modification. I

Fig. 7 is a view similar to Fig. 2 but showing still another modification.

Fig. 8 is a detail section taken on line 8-3 of Fig. 7.

Fig. 9 is a side view of an engine embodying the form in Fig. 7 and showing the wiring system diagrammatically.

Fig. 10 is a view, partly in section, showing a modified form of magnetic brake for the choke valve.

The engine 5 in Fig.1 has the usual intake.

and-exhaust manifolds 3 and I, carburetor l mounted on the intake manifold, and starter 1 motor 3. The starter motor is'operated from storage battery It! by starter pedal l2 which in addition to controlling the motor circuit may also move the starter pinion against the .fly wheel in a well known manner.

The carburetor comprises a downdraft induction conduit 13 having a series of Venturl tubes- I4. The admission of air into the upper end of the conduit is controlled by an unbalanced, butterfly choke valve I5 mounted on shaft II and carrying a spring seated, inwardly opening poppet H. The choke also has a fixed opening I3. I

The discharge of mixture into the intake mani fold is controlled by the usualthrottle valve l9. Adjacent the induction conduit, there is provided a constant level bowl 2!! having a main metering element 2| through which fuel is supplied to main nozzle 22, discharging into smallest venturi l4, and idling passage 23 discharging through ports 2; and 25 in the wall of the induction conduit.

Choke shaft l-6 extends beyond the induction conduit into a housing 26 having a cover 21. A coiled, bi-metal thermostat 28 has its inner exftremity secured to a pintle 29 projecting from cover 21. The outer end of the thermostat is hooked, as at 30-, about the end 3| of an L- shaped lever 32 rigidly attached to choke shaft I6. A stove 33 mounted on the exhaust manifold is connected to a threaded boss 34 on the thermostat housing by a tube 35. A suction connection 36 also extends from the housing to a port 31 in the wall of the induction conduit posterior to throttle I9. I

A sector 40 is rigidly attached to the choke shaft within the thermostat housing, in the pres ent instance, being formed as an extension of L-shaped lever 32. Projecting laterally from the housing is a, threaded boss 4| receiving a pointed detent 42 disposed, upon inward movement thereof, to engage the periphery of toothed sec tor 40 and lock the choke in any position it has previously assumed. A Bowden wire cable 43 Other linkage means may be substituted for the Bowden wire cable shown.

When the engine is started at low temperature, the choke valve will be yieldingly held in its closed position by the thermostat. Upon depression of pedal II, the starter motor will be energized to crank the engine and, coincidentally, to engage detent 42 and sector 40 and lock the choke. This locking action occurs in what ever position the choke may have assumed previously and prevents the opening or breathing" of the choke valve under the influence of the cranking suction. .Some air for starting will be admitted through fixed orifice It. When the engine fires and runs under its own power, poppet I! will be opened to admit additional air. Promptly, pedal I! will be released, withdrawing detent 42 from the locking segment and releasing the choke to be further opened by direct action of suction to the extent permitted by the thermostat. Thereafter, the choke is under the exclusive control of the thermostat and the pressure in the'induction conduit until starter pedal 12 is again actuated.

In Fig. 4, a starter button 41 is substituted for pedal I! in the previous form. This button closes the starter circuit through solenoid II. The solenoid armature has an extension 48 which, when the solenoid is energized, actuates a button 49 and, through spring 50 shifts Bowden wire cable 43a to engage the choke locking detent and sector as in the previous form.

The form in Fig. is similar to that in Fig. 4 except that choke locking Bowden wire cable 431: is actuated by a collar 5| on starter motor shaft 52. This collar is loose on the motor shaft and moves with the starter pinion toward the engine fly wheel when the starter motor is energized. When the engine starts to run under its own power, the pinion and collar 5| automatically retract under the influence of the usual bending spring 53.

In this figure, as well as the previous form, a wire 54 leads from starter button 41 to the battery and a second wire 55 supplies battery current to the usual ignition circuit containing ignition switch 56. A generator cut-out is shown a 51.

Fig. 6 shows controlling elements, as in Fig. 1, but starter pedal 60 first actuates a yoke 6! inside the starter motor housing to move the starter pinion against the fly wheel teeth and then closes switch. 52 to supply current to the starter motor. The final movement of the starter pedal after engagement of the pinion and which closes the switch also actuates a choke locking detent, as 42 in Fig. 3, through Bowden wire cable 430.

In Fig.7, choke shaft 65 extends sidewardly into a control housing including inner part 66 and outer part 61 separated by a non-magnetic wall 68. The end of the choke shaft within portion 66 of the housing carries a disk 69 having a pair of openings, as at 19, loosely receiving pins ll projecting from a metallic disk 12. Portion 61 of the casing mounts an electro-magnet 13 having pole pieces H extending toward metallic disk 12 and normally spaced therefrom by non-magnetic wall 68.

As shown in Fig. 9, wires 15 and 15 for energizing the electro-magnet are connected one to starter switch TI and the other to a lead 18 which extends to the battery. Thus, upon closing of the starter switch ll, metallic disk I2, which serves as an armature, is drawn against wall 68 and applies substantial braking force resisting opening of the choke valve. When the starter button is opened, the brake is released and the unbalanced choke plate permitted to open under' th direct action of air flow as far as permitted by thermostat I9 mounted in a housing opposite the brake housing. A tube 8| leads from a stove forming depression 82 in the exhaust manifold to housing 80 and the latter is connected by an orifice 83 to the outlet portion I of the carburetor induction conduit.

Fig. 10 shows a modified form of magnetic brake for the choke valve. In this figure, a housing projecting from thermostat housing 9| mounts a solenoid coil 92' having an armature 93 which operates detent 94. The armature and detent are normally'urged towards the right or active position by a coil spring 95. Wires I5 and Ii are connected to the coil, as in the previous form for supplying energizing current thereto. When the solenoid is energized, detent 94 is-urged to the left into locking engagement with the toothed or serrated edge 96 of sector 91 rigid with the choke shalt. When so energized, the solenoid locks the choke valve in whatever position it has previously assumed.

Various features may be modified as will occur to those skilled in the art and the exclusive use of all modifications as come within the scope of the appended claims is contemplated.

I claim:

1. In combination with an internal combustion engine having an induction conduit provided with an unbalanced choke valve for controlling the admission oi. air thereto, a thermostat for urging said valve toward closed position when the temperature is low, a sector carried by said valve and movable therewith, said sector having a toothed periphery, a braking detent device mounted in position to cooperate with the periphery of said sector, a manual control for initiating starting of the engine, and linkage connecting said control and said device for moving said detent device into engagement with said sector to lock said choke valve.

2. In combination with an internal combustion engine having an induction conduit provided with an unbalanced choke valve for controlling the admission of air thereto, a thermostat for urging said valve toward closed position when the temperature is low, a sector carried by said valve and movable therewith, a braking device associated with said sector, a manual control for initiating starting of the engine, and linkage forming an overrunning connection between said control and said device for moving said device into engagement with said sector to lock said choke valve.

LEONARD D. BOYCE.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,528,484 Holley Mar. 3, 1925 1,799,792 Hoepner Apr. 7, 1931 2,127,345 Roualet Aug. 16, 1938 2,127,653 Sisson Aug. 23, 1938 4 2,134,421 Sisson Oct. 25, 1938

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