US1998379A - Ignition governor - Google Patents

Description

April 15, 19395- M. MALLORY 1,998,379

IGNITION GOVERNOR Filed Jan. 4, 1934 ATTORNEY.

UNITED STATES PATENT QFFICE IGNITION GQVERNOB Marlon Mallory, Detroit, Mich., asslgnor to Mallory Research Company, Toledo, Ohio, a corporation of Delaware Application January 4, 1934, Serial No. 705,240

8 Claims. (Cl. (i4-90.5)

The obiectvof this invention is to advance the ignition with engine speed and to simplify the cam timing mechanism, and, at .the Sametime to permit variation in load to modify the advance 5 due to speed acting alone.

Figure 1 is a. plan view looking down a completely assembled governor and spark control mechanism.

Figure 2 shows a cross-sectional elevation in which the section follows the plane 2-2 of Figure l.

Figure 3 shows a plan view taken on plane 3-3 of Figure 2.

Figure 4 shows a plan view taken onplane 4-4 5 of Figure 2. l

Figure 5 is a modified sectional elevation taken on plane 5-5 of Figure 3 with the governor weights suspended from the cam Iplate instead of being supported from below as shown in Fig 0 ure 2.

Figure 6 shows a plan view of a modified form of the governor shown in Figures l to 5.

Figure 7 shows a cross-sectional elevation taken on plane 1-1 of Figure 6.

5 Figure B shows a plan view of another alternative construction.

Figure 9 shows a cross-sectional elevation taken on plane-9 9 of Figure 8.

In the Figures 1, 2, 3 and 4:-

J I0 is the driving shaft and 54 (Fig. 2) is the ignition timing cam which is driven thereby as follows:-

Shaft I0 drives a plate I I on which are mounted two pins I4I4. A portion of the shaft I0 may i be flattened, as at I 0, to secure the plate II g against rotation relative to the shaft. These pins I AI4--I4 project through slots 6|);60 in the governor control plate I6. After passing through this slotted plate I6, the pins I4-I4 engage with the cam plate 28. This cam plate 28 is shown in Fig. 3 and rotates with the driving plate II and shaft The centrifugal Weights 21-22 are pivotally mounted on the pins 26-23, which pins are mounted on the governor control plate 16. 'I'he Fig. 3. The face 24 of weight 22 rolls over the face of the cam plate 28 and the weight 21 vhas a similar action.

The governor control plate I6 is anchored by means of the two radial springs I8-I8 to the friction disc I5. This disc I5 is also connected with the driving plate II through the circumferential spring I2. (See Figs. 2 and 4.) The relative movement permitted between I5 and II is deterweights engage with the cam plate 28 as shown in mined by the clearance of the. slot 66 in the disc I5, through which slot the pin I4 passes on. its way from the driving plate I I to the cam plate 28. The springs I8--I 8 are stretched between the pins I1I1 located on the governor control plate I6, 5 and the pins I9-I9 located on the friction disc I5. I2 isanchored to II at I3.

On one of the governor weights is a pin 2 I ,which engages with one of the slots 53 in the plate 52 which is locked to thetiming cam 54, which cam 10 controls the time of ignition in a Well-known way. (See my co-pending case, Serial #538,187, filed May 18, 1931.)

The friction disc I5 engages with` the friction pad 18, which is pressed against I5 by means of 15 the piston 28 and the coil spring 30. This piston is operated by the inlet vacuum as described in my Patent #1,896,714, issued February 7, 1933.

In Fig. 5,v the weights 21-22 are suspended from the plate 56, which is made solid with the cam 54 by means of the piece 55. Governor weight pins 51-2-58 project down from 56 and provide Apivots for the centrifugal weights 22-21, which engage with the cam plate 28 exactly as the weights 22-21 do with the cam plate 28 in Fig. 3. 25 A friction disc 59 is provided corresponding to the disc I5 of Figs. 1, 2, 3 and 4. The cam plate 28 is connected to the driving plate II by the pins I4 as in Figs. 1, 2, 3 and 5, and the plate 56 is advanced directly by the movement of the pins 30 51-58, because in this construction there is no slotted plate 52 with slots 53. A similar direct. motion without the intervention of a slotted plate is obtained in the constructions shown in Figs.

6, "I, 8 and 9. t 35 In Figs. 6 and 7, a centrifugal weight 35 is shown pivoted at 31 to the plate 38, which is made solid with the bushing 39, which, in its turn, is made solid with the ignition timing cam 48. 35 engages with the pin 36 on disc 3|.

The plate 38 is anchored to the friction disc which are stretched between the pins 34 and 32, 34 being mounted on the plate 3/8, and 32 on the friction disc 3|. 4,.

cam 50 through the connecting piece 99. The portion 48 of this plate 48 rolls against the cam face 88 of the weight 41, being held nrmly against the face 88 by means of the spring 5I, which spring is anchored to the friction plate 4l by the pin 91.

Operation In Figures 1, 2, 3 and 4:-

vThe weights 21, 22 fly out and roll on the cam plate 28, thus advancing the control plate I6 and stretching th'e springs I8I8. At the same time, the pin 2| on the weight 22 engages with one of the slots 53 in the plate 52, which has been selected to give the' desired angular rate of advance to the cam 84. Thus the total advance of the circuit breaker cam 54 with reference to the shaft Il), or in other words the total spark advance, is equal to the advance of the governor control plate I6 on the shaft, caused by the cam action of the weights 22, 21 against the edge of the plate 28, plus the advance of the plate 52 with reference ,to the plate I8, caused by the inclination of the selected slot 58 with reference to the path of the pin 2| as the weights swing outwardly about their pivots 2l, 28. Meanwhile, the tension of the spring I8 has by its distortion from a true radius subjected the friction disc I5 to a circumferential component, which overcomes this circumferential spring I2 and causes a hop in the governor characteristic, which is the feature characterizing another application, Serial Number 703,705, led December 23, 1933.

In the event that the engine throttle is wide open, the depression in the inlet manifold is destroyed and the piston 28 pushes 18, which is usually a leather pad, against the friction disc I5, and thus puts the spring I2 out of laction as the drag imposed by the friction and the spring 30 makes the pin I4 close up the gap in the slot 66. plication referred to above. After the "hop referred to has taken placepthe centrifugal force continues to act on the weights 22-21, which continue to roll over the cam plate 28. and the point of contact between the weights and the -plate continues to approach the axis and hence the springs I8--I8 offer an increasingly stiff restraining influence and so complete with the tendency of the centrifugal force, which increases with the square of the speed to overwhelm the spring.

In Fig. 5, the action is similar to that described in Figs. 1, 2, 3 and 4, except that the spring I2 and piston 28 .have been omitted for the sake of simplicity.

In Figs. 6 and '1, the weight 88 nies out and engages with the pin 38, and thus rotates the cam plate 38 and advances the ignition. The two radial springs 83 act to restrain the advance and the cam surface of the weight I8, engaging with pin 38, causes' an increasingly great restraining action on the rotation of the governor weight around the pin 81 to be imposed by the springs 33-33.

In Figs. 8 and 9, the weight 41 flies out and stretches the spring meanwhile the spring II, which is a relatively light spring, causes the cam 58 to rotate with and to follow after the rotation of the` weight 41 around its pivot l2' on the .plate 43.

Figs. 6, 7, 8 and 9 are shown with the vacuum control 28, 88 and 18 acting in conjunction with the circumferential spring I2.

What I claim is:-

This feature is also the subject of the ap l. In an ignition governor, a driving shaft, a. cam and a plate both rigidly connected to said shaft, a governor control plate rotatably mounted on said shaft, a pair of governor weights pivotaily mounted on said control plate and engaging said cam to advance the control plate with the weight pivots as the Weights move under the infiuence of centrifugal force, ignition timing means adapted to be advanced by such movement of the weights, spring means resisting the advance of said control plate, and means for progressively increasing the distance between the weight pivots and the points of engagement of the weights with said cam, as the weights are thus moved.

2. In an ignition governor, a driving shaft, a driving plate mounted thereon, ignition timing means concentric therewith, a driven plate in fixed relation to the timing means, a concentric governor control plate, a centrifugal governor weight pivotally mounted on said control plate and operable to advance the driven plate according to the speed of rotation, and substantially radial spring means acting between the driving plate and the governor control plate to oppose the centrifugal force.

3. In an ignition governor, a driving shaft, a driving plate mounted thereon, ignition timing means concentric therewith, a driven plate in fixed relation to said timing means and having a plurality of slots, a plurality of centrifugal governor weights located between said driven and driving plates, a governor control plate upon which said weights are pivotally mounted, substantially radial springs acting between the governor control plate and said driving plate, a cam mounted on the driving shaft adapted to engage with said governor weights, and a single driving means mounted on one of the governor weights and engaging one of the slots in the driven plate.

4. In an ignition governor, a driving shaft, a driving plate mounted thereon, a second plate loosely mountedon the driving shaft and concentric with the driving plate, yieldable driving means for said second plate and rigid driving means therefor, the latter being operative after the second plate has moved a limited number of degrees relative to the driving plate, ignition timing means, a driven plate fixed with reference to the timing means and having a plurality of timing slots, a plurality of centrifugal governor weights located between the driving and driven plates, a governor control plate upon which said weights are pivotally mounted, substantially radial springs extending between said second plate and the govemorcontrol plate, a cam mounted on the driving shaft and adapted to be engaged by said governor weights, and a single driving means on one of the governor weights and engaging one of the slots in said driven plate.

5. Anignition governor for internal combustion engines, comprising a driving plate,a driving cam in xed relation thereto, a driven plate, a governor weight control plate, a plurality of governor weights mounted on said control plate, said control plate and weights being located between the driving and driven plates and the weights engaging between the cam and the driven plate to advance the latter, and means including a radial springl acting between said control plate and said driving plate.

i 8. An ignition governor for internal combustion engines, comprising a driving plate, a driving cam in fixed relation thereto, a. driven plate, a governor weight control plate located between the driving and driven plates, a governor Weight pivotally mounted on said governor weight control plate and engaging said cam, and spring means acting between the control plate and said driving plate.

'7. An ignition governor for internal combus tion engines, comprising a driving plate, a driving cam iniixed relation thereto, a driven plate, a' governor weight control 4plate located between the driving and driven plates, a. governor weight pivotally mounted on said control plate and en gaging said cam, and means including a radial spring connecting the control plate to said driva ing plate.

8. An ignition governor for internal combus tion engines, comprising a drive shaft, a driving plate in fixed relation thereto, a second plate. a governor weight pivotally mounted thereon, means including a tension spring connecting the second plete to the driving plate, and a projection from the driving plate adapted to engage the governor weight at a progressively increasing distance from the governor Weightr pivot as the weight swings outwardly.

MARION MALLORY.

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