US2009935A - Ignition timing governor and distributor - Google Patents

Description

July 30, 1935. M. MALLORY 2,009,935

IGNITION TIMING GOVERNOR AND DISTRIBUTOR Filed May 26, 1934 ATTORNEY Patented July 30, 1935 v UNITED STATES PATENT OFFICE IGNITION TIMING GOVERNOR AND DISTRIBUTOR Marion Mallory, Detroit, Micln, assignor to Mallory Research Company, Toledo, Ohio, a corporation of Delaware Application May 26, 1934, Serial No. 727,758 10 Claims. (Cl. 200-31) One object of this invention is to improve the therewith, a distributor terminal 49 is mounted, timing of the ignition on an internal combustion which is one of a number. engine by modifying the action of a centrifugal In order that the conductor 4'! shall engage governor by means of the friction developed in with the terminal 48 and also with the terminal the distributor so that the centrifugal force is 49, it is made in the form of a compound spring. 5 opposed at first only by this friction, which re- This form of distributor imposes a certain sults in an initial advance which is at a greater amount of friction determined by the resiliency rate per R. P. M. than is the subsequent rate. of the member 41. 41 is anchored to the dis- Another obect is to apply additional or altertributor arm 45 by means of a set screw 46.

native friction to accomplish the same result. A The characteristic feature of the governor re- 10 spring load is subsequently applied in the welld s in t O P t s 23 and 4. 23 is fixed to known manner to assist the friction in opposing the hollow shaft 24. The plate I4 is free except the centrifugal force. for the fact that the pin has only a limited The governor characteristics desired show a movement in t Slot 2| Of the p a n a 15 rapid advance at the lower engine speed and a similar way, t e D has imit dm v m t l5 much slower advance at the higher engine speed. 1' the Slot These two p l5 d are dia- Fig. 1 shows a perspective elevation view of metrically opposite to each other. the complete device except for the circuit 4 S OWS the Circuit breaker mechanism breaker, comprising cam 43, which engages with a pair of 20 Fig. 2 shows a particular plan view on plane ocke a s 9. wh ch rock a ound pivo s 2o 2-2 of Fig, 1, 606l. Flat springs 62-63 apply the necessary Fig. 3 is a plan view on the plane 3 3 of Fig, 1, pressure S0 that the rocker arms follow the move- Fig. 4 is a plan view on the plane 44 of Fig. 1. ment of the cam 43 even at 2000 R. P. M. The In the figures: springs are anchored at 61 and 68 to the circuit I0 is the driving shaft, having a serrated porbreaker plate 10. This plate 0 is mou ed rigidly 25 tion H, which engages with the disc l2 to which in h v n r ho s ha he am 43 is connected the plate I3, A second plate i4 constitutes the sole means for timing the ignition and a third plate 23 are freely mounted on the contacts 84-65 and 69'H, which are p v ded shaft I 0. They are free to move past the pins 34 to operate the ignition circuit (not shown). This and 35, which pins support the cam 33, having invention is not directed to this detail, which is 30 the two cam surfaces 3! and 32. The plate 23 the subject of other cop n i andissued P n is rigidly connected to the hollow shaft 24, which h fe t e of i nve is the ppli i n carries the timer cam 43 and also the distributo of friction as the sole initial controlling means to arm 45, which is made of a hard insulating m counteract the centrifugal force of the governor. v terial such as bakelitei Pins I1 and I8 project Operation 35 from the plate l3. These pins l1 and iii are connectedwith pins I5 and 20 on the plate I4 In the Operation of 1She governor, the friction by means f the radial Springs s and 9 imposed by the resiliency of the distribution memt if l weights and 28 are Shown pivoted her 41 and the friction pad 36 tends to retard the mounte'd on the pins 25 and 29 which project advance of the ignition camtimer 43 and to op- 40 from the plate 23 and these centrifugal weights pose the ,efiect of the cenmmgal force t have projections 25 and 30, which engage with by the welghts 21 and Wnen the centrifugal the cam surfaces 3| and force overcomes the friction,the plate 23 moves a distance determined by the slot 2|, and the pm A friction device 35 is shown in Figs. 1 and 2 I5 th d b th 1 t 23 d th 1 'th the hollow shaft 24. as is preferen engage y 6 8 an e mg 45 engaging. W1 l6 becomes operative to resist the advance of the ably a piece of leather. The friction is applied ignition cam 43. by means of a Plunger 37 and the Spring It thus happens that the number of revolutions The pluhger 37 moves in the cylinder and the per minute at which the timing increases ini- Stop 15 used apply a definite Pressure to the tially is determined by the friction of the distribu- 50 Spring 4! is threaded at 39 into the tor and of the pad 36. The subsequent advance erner housing A distributor housing 44 oi'the ignition is determined by the tension of the hard insulating material is concentrically mcuntspring I 6 and the corresponding spring l3. It will ed above the governor housing 42. In the disbe seen that the movement of the weights 21 and tributor housing 44, having a cover 5| integral 28 against the cam 33 which is fixed to the shaft l0 causes the plate 23 to rotate in two -distinct stages and to carry with it the shaft 24, which, in its turn, advances the timing cam 43' in the two distinct stages, first at a rapid rate, then at a slower rate.

What I claim is:-

i. In an ignition timing governor, circuit breakerand distributor, a governor housing having a closed end, a driving shaft, a driven shaft coaxial therewith, a plate fixed to said driving shaft, pins projecting from said plate, a loose plate mounted on said driven shaft, pins mounted on said loose plate, resilient means connecting said pins with the first mentioned pins, a third plate fixed to the driven shaft, and having a pair of pins projecting therefrom, a pair of centrifugal weights pivotedly mounted to rotate thereon and having cam faces pro ecting therefrom, openings through which they in the edge of said third plate pins of said loose plate project so that the loose plate may rotate a limited number of degrees before engaging with the fixed plate, a cam rigidly connected withthe drivingshaft and engaging with the cam faces of said centrifugal weights, a circuit breaker cam, circuit breaker mechanism mounted in said governor housing, a distributor arm mounted on said driven shaft, friction means associated with said distributor arm for the purpose described;

2. In an ignition timing governor, circuit breaker and distributor, a governor housing having a closed end, a driving shaft, a driven shaft coaxial therewith, a plate fixed to said driving shaft, pins projecting from said plate, a loose plate mounted on said driven shaft, pins mounted on said loose plate, resilient means connecting said pins with the first mentioned pins, a third plate fixed to the driven shaft and having a pair of pins projecting therefrom, a pair of centrifugal weights pivotedly mounted to rotate thereon and. having cam faces projecting therefrom, openings in the edge of said third plate through which the pins of said loose plate project so that the loose plate may rotate a limited number of degrees before engaging with the fixed plate, a cam rigidly connected with the driving shaft and engaging with the cam faces of said centrifugal weights, a circuit breaker cam, circuit breaker mechanism mounted in said governor housing, friction means engaging with said driven shaft for the purpose described.

3. Inan ignition timing governor and distributor, a housing therefor having a closed end, a dri Jing shaft, a driven shaft coaxial therewith, a plate fixed to said driving shaft, pins projecting from said plate, a loose plate mounted on said driven shaft, pins mounted on said plate, springs connecting said pins with the first mentioned pins, a plate fixed to the driven shaft, a pair of centrifugal weights pivotedly mounted to rotate thereon and having cam faces integral therewith, means permitting the loose plate to freely rotate a limited number of degrees and then to engage with the fixed plate, a cam rigidly connected with the driving shaft and engaging with the cam faces of said centrifugal weights, a circuit breaker cam, a distributor arm mounted on said driven shaft, friction means associated with said distributor arm comprising an electrical conductor yieldably mounted on said arm, a central conductor and a series of conductors mounted in a circle around said first conductor in the closed end of said housing.

4. In an ignition timing governor, a driving shaft, a plate rigidly mounted thereon, a second plate mounted for relative circumferential move-- ment with reference to the first plate, a third plate mounted to turn freely through a limited angle on said shaft, a circuit breaker cam rigidly connected with the third plate, spring means connecting the first plate to the second plate, a governor for advancing the third plate, and a lost motion connection between the second and third plates to relieve spring tension from the second plate when the thirdplate is only partially advanced.

5. In an ignition timing governor, a driving shaft, a plate rigidly mounted thereon, a cam rigidly connected to said plate, a second plate driven by said shaft, a third plate having limited free circumferential movement on said shaft, a timing cam rigidly connected to the third plate,

centrifugal members'mounted on the. third plate and engaging the first cam to cause relative advance of the third plate as said members move outwardly, and spring meansconnecting the first and second plates to oppose the relativeadvance of the latter. 1

6. In an ignition timing governor, a driving shaft, 2. plate rigidly mounted thereon, a second plate mounted for advance movement with relation to the first plate, a third plate mounted for limited advance movement with reference to the second plate, a circuit breaker cam rigidly connected to the third plate, centrifugal means for advancing the third plate, frictional means resisting the advance of the third plate, and spring means resisting the influence of the centrifugal means upon the second plate.

.7. In an ignition timing governor, a driving shaft, a plate rigidly mounted thereon, a second plate mounted for advance movement with relation to the first plate, a third plate mounted for limited advance movement with reference to the second plate, a circuit breaker cam: rigidly connected to the third plate, centrifugal means for advancing the third plate, and spring means operable to resist such advance only aftera predetermined initial advance has been completed.

8. In an ignition timing governon'a driving shaft, 9, member mounted for advance movement with reference to said shaft, a plate mounted for advance movement with reference to said member, a circuit breaker cam rigidly connected to said plate, centrifugal means for advancing said plate and cam, a pin and slot connectionlimiting the advance of said to said member, and spring means resisting the advance of said member with reference to the shaft.

-9. In an ignition timing governor, a shaft, a circuit breaker cam mounted for relative advance movement with reference to the shaft, a governorv for effecting the advance of said cam, frictional means opposing the initial advance of the cam, and spring means opposing further advance thereof only after the initial advance has been completed. V

10. In an ignition timing governor, a shaft, a circuit breaker cam mounted for relative advance movement with reference to the shaft, a governor for effecting the advance of said cam, and spring means operable to resist such advance only after a predetermined initial advance has been 7 completed.

' MARION MALLORY.

plate with reference

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