US1967445A - Ignition governor - Google Patents

Description

mentes July 24, 1934 5 1,967,445

UNITED STATES PATENT OFFICE IGNITION GOVERNOR Marion Mallory, Toledo, Ohio, assigner to The Mallory Research Company, a corporation of Delaware Application May I8, 1931, Serial No. 538,187 9 Claiml. (Cl. 2GB-31) This invention relatesfto an ignition governor advance of the spark in accordance with. the capableoi controlling the timing of the .spark lincreased speed of the engine while the other in accordance with the speed of the engine. acts merely asa counterbalance. Each weight In engines of different makes and even in 22 is' provided with 'a pin 24 and the pin on d dinerent engines of the same make, in 'order to the uppermost weight is adapted to be received 00 obtain the greatest possible emciency, it has in a slot 25 in the cam plate 19. been `found necessary. to correctv or adjust the In'order that the maximum possible advance rate at which the spark isA advanced as. comof the spark may be limited in accordance with pared to the increased speed o! the engine, and the. operation of any engine to'which the gov- 1d in most cases the advance at the lower speeds, ernor may be applied, the plate 19.' is formed G6 say below 800 R. P. M., requires a dierent rate with a number of slots 25- which, in the present than at the higher speeds. Also, in some eninstance, respectively represent anadvance of gines, the'maxim'um advance at high . speed 15,20, 25, 30, 35 or 40 with-reference to should be less than in others. the rotation of the timer shaft. In Fig. 3, the 1I With the above conditions in mind, it is an pin 24 of the governor weight 22 is represented Y0 object 'of the present invention to provide a as engaging the 20 slot, the initial position of governor which may be adjusted more accuthe governor weight being represented by a rately than those heretofore used, particularly dotted line Aand the position of the governor in order to meet these various conditions. As -weightand the slot at the maximum advance .10' a result of `my improvedl construction a single of `the spark being represented bydot and dash 7i.

governor may be adapted for-use in connection lines. v l with diilerent engines which differ greatly in The position of the plate 14, with the weights 'their operation. 22, and of 'the cam plate 19 as represented in the The invention. hi itil preferred 10m. will be drawings is tor a right hand rotation of the more particularly described `in connection with timer shaft asindicated by the arrow a iii-Fig. 80 the accompanying drawing, in which` 2. Ii' the governor is. applied' to a. timer shaft Figure 1 illustrates the invention partly in having a leithand rotation the cam plate 19 elevation and partly in section;l and the plate 14 carrying the weights 22 should 'Figure 2 is aplan view of the governor with b inverted vThis change is ,easily made by a0 the cam plate and sleeve removed; removingthe screws 21 and the nut 13 respec- Figure 3 is a plan view of the cam plate and tively. sleeve, illustrating 9.180 the DOSiOn 0f the BOV- In -orde'r that the advance of the spark may ernor weight with reference thereto: v beproperly controlled at both lovv'er and higher Figure 4 is a section taken on the line 4-4 speeds, the centrifugal' action'of the weight 22 il of'Fig. 2; and is resisted first by a primary spring 26 which Figure 5 representsa chartshowing advance engages a rolier2'l onthe governor weight and curves for various adjustments oi the cam piatelater by asecondary spring 28 as the speed in-' In carrying out my invention, the timer vshaft creases. Each o! the .springs 26 and 28 may .l0 is reduced at its ,Upper end t0 form an B11- be composedof a number of thin leaves which do nular' shoulder 11. Above this Shoulder is a may be selectively removed or inserted to ad- 95 threaded portion 12 on which 1S a mit 13 adapted just the timing in accordance with'V the operation t0 clamp 51215116 14 against the shoulder 11- of the engine. Bothsprings are secured at their The smooth upper portion 15 of the shaft oor-l rear ends to an upstanding lug 29 on the pme ries a 'sleeve 16 on' which is keyed a circuit- 14 by means of Screws 30 and 31, a washer 32 -45 breaker cam 17. The lower end Iofthe sleeve and a spacer 33 By lemovmgsome of the 100.

l1611s formed with a circumferential ange 18 leaves of the rm 28 the advance wm begin towmch a universal "am plate 19 is clamped by at a lower The rate of advance will bemeans of a collar 20 and screws 21. l

obviously, the cam piste 19 maybe set in m 1 as the spring 2 engages *he mi 8. By tightening the screw 31, drawing the Boany position circumierentially of the sleeve 16 2 105 in order to secure a proper initial timing or the free end 0i me spring 28 'mud the Spring 2 spark. Two governor weights 22 i are 'disposed the 510W fate 0f advanm begin at a lower symmetrically with reference to the shaft 10 and Speed BY increin the mentire length 0f the are pivotally mounted .on pins 23 secured to the screw 31,' 0r if,` n. by inserting a M081' 5l' plate 14. One of these weights controls the 33 of greater thicknessthe slower rate of adu the secondary eii'ect only at Vance under the inuence of spring 28 may be caused to take a higher rate oi' speed.

In the chart 34 represented in Fig. 5, the lines 35 represent the degrees of spark advance with reference to the speed of the engine for various settings oi' the cam plate 19, the other settings of the governor remaining the same. In this chart, the abscissas represent the number of revolutions per minute and the ordinates represent the degrees of advance of the spark ahead of dead center position of the piston. The iixed setting representsv an advance of 15 and the tension oi the spring 26 is such that the governor begins to move outwardly at about 500 .R. P. M. while the secondary spring 28 takes eifect at about 800 R. P. M. 'Ihis is a correct setting for many engines 'requiring a rapid advance o f the spark between 500 and 800 R. P. M. and then a slower advance. The lgovernor may be adjusted for engines requiring a substantially straight line advance or, in other words. a uniform spark advance for all speeds, by setting the secondary spring so that its tree end substantially' touches the primary spring when at rest. By varying the strength of the springs the maximum advance may take place at any speed desired. l

From the foregoing description, it will be understood that a speed curve with any desired rate of advance, either at lower or higher speeds may be obtained merely Vby the proper adjustment. Also, by propervadjustment, the beginning and end of either rate of advance maybe caused to take'place at any desired engine speed.

While I have shown and described specifically one embodiment of the invention, it will be apparent that the same may be modified in many respects without departing from the scope of the invention as deiined in the claims.

Having thus described my invention, what I claim as new and desire to secure by United States Letters Patent is:

1. In an ignition timer for internal combustion engines, the combination with means for advancing the timing of the spark as the speed of the engine increases, of means for limiting the angle' of maximum advance, means for adjusting such limit, and means for adjusting the control of the speed responsive means, so that the limit of advance will be reached at' a higher or a lower speed.

2. In an ignition timer, the combination'with a centrifugal governor, of a circuit breaker cam, and a plate having a plurality of radiating slots with different angles of advance, said plate being adjustable with reference to said cam and governor to bring any one of said slots selectively into cooperative relation tu the governor.

3. In an ignition timer, the combination with a circuit breaker cam, of a cam plate mounted for krotation therewith and having a plurality of slots with different angles of advance, a centrifugal governor, and means for adjusting the trolling the advance of cam plate with reference to the circuit breaker so that the governor selectively cooperates with any one of said slots to advance the spark in accordance with the speed, the selected slot deiining the limit of maximum advance.

4.' In an ignition timer, the combination of a shaft.' a member mounted` for circumferential advance with reference to said shaft, a circuit breaker cam keyed to said member, a centrifugal governor mounted on saidl shaft for consaid member, and an intermediate member having a fixed circumferentially adjustable connection with said rstmentioned member and operatively connected to said governor.

5. In an ignition timer, the combination of a shaft, al member mounted for circumferential advance with reference to said shaft, a circuit breaker cam keyed to said member, a cani plate secured to said member and circumferentially adjustable with reference thereto, and a centrifugal governor operatively connected to said cam plate.

6. In an ignition timer, the combination of a shaft, a member mounted for circumferential advance with reference to said shaft a circuit breaker cam4 keyed to said member, a cam plate secured to said member and circumferentially adjustable with reference thereto, said plate having a plurality of slots of diiferent degrees of advance, and a centrifugal governor which may be operatively engaged with any one oi' said slots.

7. In an ignition timer for internal combustion engines, the combination with means for advancing theltiming of the spark as the speed of the engine increases, of a primary spring constantly resisting such advance, a secondary spring eiiective .to offer further resistance to such advance above a predetermined speed, and

adjustable means to cause the secondary spring to become effective at a vhigher or a lower speed.

8. In an ignition timer for internal combustion engines, the combination with means for advancing the timing of the spark as the speed of the engine increases-,of aprimaryspring constantly resisting such advance, a secondary spring engageable with the primaryspring after the latter has yielded to a predetermined extent to oppose further yielding thereof, and means to adjust the secondary spring to vary the position at which the primary spring becomes engaged thereby.

9. In an ignition timerv for internal combustion engines, the-combination with means for advancing the timing of the spark as the speed of the engine increases, of a primary leaf spring and a secondary leaf spring, both secured at one end, with their free ends normally spaced apart in position to successively resist such advance, and means for adjusting the free end of the secondary spring` toward or away from the primary spring.

' MARION MALLORY.

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