US2511095A - Engine governor - Google Patents

Description

June 13 1950 I I c, BARNES 2,511,095

ENGINE GOVERNOR Filed Feb. 1, 1947 5 Sheets-Sheet 1 Elg l;.

l lnhl q limlh INVENTOR.

BAA 004% C BAR/V1; BY

ATTORNEY June ENGINE GOVERNOR I Filed Fe 1' 947 5 Sheets-Sheet 2 INVENTOR.

ATTORNEY June 13, 1950 R. c. BARNES 2,511,095

' ENGINE GOVERNOR Filed Feb. 1, 1947 3 Sheets-Sheet 3 INVENTOR.

ATTORNEY Patented June 13, 1950 ENGINE GOVERNOR Randolph C. .Barnes, Peoria, .Ill., assignor to Caterpillar Tractor. Co.,.San'Leandro, Calif.,"'a corporation of California Application February 1, 1947; Serial-No. 725,799

Claims.

'Ihis' inventionrelat'es to engine governors and particularly to improvements in. governorv vcon- I trols to enable a simplifiedsetting. of a governor eithe'rcatits position-of low enginespeed or at its. position .for enginelshut-down.

Ini'an. internal v combustion .engine, particularly. of thelcompression ignition type ,r .a spring-balanced. governor. is usually. employedfor. .controle.

ling thei quantityof fuel directed to the combustion chambers of the engine. A handthrottle or other-form ofcontrol lever is connected with the governorspringin a manner to vary its ten-v sion and thus to establish the. speedat which the.

engine operates. Ihe lowest governor setting for engine operation, generally referred toas low idleposition," effects incl-feed 'just sufficient to sustain operation of .the engineundcr no-load conditions, audit is desirable thatithegovernor control lever be. stopped at thisaposition in orderto avoid accidental stalling of the enginethrougn careless adjusting-of thecgovernor. .The low idle 1 stop for-the governorcontrol .is often .a resi1ient= stop to permit-thecontrol to be moved still lower for shutting off all of the fuel-when it is desired to shut down. the engine. The resilientstop tends to'return the control .to its low idleposition. It

is sometimes desirable; as in starting an engine, to turnit over'severaltimes'withoutfeeding fuel to itscylinders forthe purpose of raising its tern- 1 perature preparatory to startinge There are various ways of raising V the engine "temperatures such as directing exhaust-gases from. a starting engine through its intake manifold, orcirculating thecooling water betweenthe'starting engine and the main engine. To preventthe main engine from consuming fuel during the initial operation of the starting engine or during-the warm-- ing up-period,the-governor control-lever must. beheld inits shut-down position. It is therefore customary wh'erea resilient stopis employed at low idle-positiontoemploy someilatchi-ng means to hold the control lever in shut-down positionagainst-the pressure"oftheresilient stop tending toreturn it to its low:idle =po'sition..-..aIn orderto hold the control lever in Shiite-dOWlTPOSltiOIl; the

operator"ofconventional engines has to :manipulate the lever against the action oftheresilient" of the inventioneis toprovidea governor with meansfor latching it in a shut-down position. automatically whenit is moved to such'position. Still further and'morespecific objects and. advantages of the invention'are made apparent in the following specifications wherein reference. is 1 made to the accompanying drawings for a detailed descriptionthereof.

In the drawings:

Fig. 1 is a vertical, sectional view through a governor housing disclosing parts of a governor embodying the present invention;

Fig. 2 is a similarsection on a plane parallel but spaced from the plane upon 'whiclrl 'igf 1 is taken;

Fig. 3 is a similar fragmentary section illustrating a different position of the parts illu'strajted' in Fig. 2; and

Fig. 4 is a view like Fig. 3 illustrating a third position of the same'parts."

Referring first to Fig-1 of the drawings a gov ernor housing in is shown as'supportedagainst a convenient part II of an internal combustion engine which, in this case, is one wall of a con' ventional fuel pump'housin'g. A removable cover I2 is provided for the governor housing and may be secured thereon asby' cap screws; one of which" is illustrated at I3. "'A spindle shaft I4 is mounted for rotation in a bearing [5, arried'b'y'the cover" l2; and a bearing [6 "carried 'by'the housing. The

spindle shaft H is rotated in'accordance with engine speed by means of gears '11 and "icon-- necting it in this case witha fuel='pump"cam-=" shaft [9. A pair of governor fly weights "2ll'are"" pivotally connected as by pins 2 lwitha governor fitting 22 carried on and rotatable with the 'spindle shaft I4. 'Upon rotation of the shaft the fly weights 2!: tend toswin'g outwardlyabout'their pivots 2| So thatrollers 23f'carried-by "them" bear against a flange 24*fnounted for'sliding'movement longitudinally of the" spindleshaft'." The" I flange 24 moves to the'right as viewed *in'Fig." 1 upon spreading of the governor fly'weightsand; through a thrust bearing 25, exerts-pressure against rollers 26 carried bya lever 21; "The lever has a hub portion 28rotatably supported on' a shaft 29 and as this leveris urged to swing rightwardly its upper endytonnected by a link 38 with a fuel pump slide bar 3|, effects reduction in the quantity of fuel delivered to the engine" by its fuel pumps throughconventional mechanism such, for example, as metering type pumps adjusted by rotation of their plungers, as is well understood in the art.

This rightward swingingmovement: of the lever 2'! is resisted by .a governor'spring illus-. trated at 32 in Fig. '2. The lower end. ofthis. spring is anchored to a lever33 fixed to th'e'same hub .28 asthe lever 2land its upper end. is an-.. chored. through an adjustable .'connection 34 to an arm 35 of a lever 36. The lever 36 as shown in Fig. 1 is secured as by a set screw 31 to a shaft 38 which shaft also carries and is rotatable by a lever 39. Lever 39 may be operated by a remotely positioned control lever 40 with which it is connected as, for example, by a connecting rod illustrated at 4|. Thus the control lever 40 may be employed for rotating the shaft 38 to vary the tension on the governor spring 32. In the position illustrated in Fig. 2, the setting of the governor spring is for high speed or high idle, and a high idle stop is provided by a screw 42 threaded through the upper portion of the housing I and engageable against a pad 43 on the lever 35 to prevent further movement of the governor spring in this direction. The stop screw 42 has a hexagonal head and may be locked in its adjusted position by a cap 44 fitting on the governor housing and provided with a hexagonal recess 45 to receive and prevent rotation of the head of the screw 42. Cap 44 may be retained in place by one or more cap screws as shown at 46.

In order to provide a low idle stop for the governor spring adjustment, the lever 35 is provided with a second arm 41 with a squared end 48 engageable in the low idle position of the governor control with a face 49 on a pivoted stop dog 50. A pivot pin supports this stop dog relative to a block 52. A spring 53 is anchored at one end of the stop dog 50 in an off-center position and is anchored at its opposite end to a spring anchor 54.

In operation when the control lever 40 is swung from its high idle position, shown in Fig. 2, to its low idle position illustrated in Fig. the end 48 of the lever arm 41 engages the stop as shown in Fig. 3. and a definite stop position is established. However, by exerting somewhat greater ressure on the control lever 40, its movement in the same direction may be continued until the shut-down position illustrated in Fig. 4 is reached. During this movement the lever arm 41 bears against the face 49 01' the pivoted stop dog with sufiicient force to overcome the tension of the spring 53 and to swing the dog about its pivot and move the upper end of spring 53 past the center of the pin 5! so that the stop dog is swung to and resiliently retained in the position illustrated in Fig. 4 with the lever end 48 on the lever arm 4! bearing in the opposite direction or downwardly against a shoulder 55 on the stop dog. In this position the tension of the spring 53 retains the governor in its shut-down position, though upon application of sufiicient force to the control lever 40 in the opposite direction the normal operating position of the governor may be reestablished.

As it is desirable that the low idle governor position be an adjustable one, the position of the stop dog 50 may be varied without varying tension on the spring 53 and without otherwise interfering with its automatic function. This is accomplished by supporting both the block 52. carrying the stop dog, and the spring anchor 54 on a single plate 58. As shown in Fig. 2, this plate 58 is slidably supported in a bracket 59 secured to the interior of the housing as by cap screws 50. To vary the effective position of the low idle stop face 49, a screw 61 is threaded into the block 52. A shoulder 62 on this screw abuts the inside of the housing In and a hexagon nut 63 is threaded on the screw to abut the outside of the housing and is then pinned to the screw against relative rotation thereon. Thus,

by rotation of the nut 63 the entire screw is rotated and through its threaded connection with the block 52, the stop dog and its associated mechanism is raised and lowered in order to adjust the low idle setting of the governor. The housing cap 44 includes a hexagonal recess 64 which embraces and prevents accidental rotation of the nut 63.

I claim:

1. In an engine governor, a stop member, a part engageable with the stop member at low idle governor position, means supporting the stop member for movement by said part upon adjustment of the governor to shut down position, and means on the stop member engageable with said part for preventing return thereof toward low idle position, and an oiT-center spring resisting movement of the stop member in either direction.

2. In a spring balanced engine governor, means including a moveable part for setting the tension of the governor spring, a pivoted stop member engageable by said part when the spring is set for low idle operation, an off-center spring connected with said stop member for resisting its pivotal movement, and means whereby upon setting of the governor spring to shut down position said part will pivot the stop and the offcenter spring will hold the stop in a position preventing return of said part toward low idle position. v

3. In combination with an engine governor having a part moveable upon changing the governor setting from low idle to shut down, a pivoted stop member with opposed stop faces engageable by said part in one position as a low idle stop and in the opposite position as a shut down stop, and an off-center spring associated with the stop member to resist its movement from one position to the other.

- 4. In combination with an engine governor having a part moveable upon changing the governor setting from low idle to shut down, a pivoted stop member with opposed stop faces engageable by said part in one position as a low idle stop and in the opposite position as a shut down stop, and an oiT-center spring associated with the stop member to resist its movement from one position to the other, and means supporting the pivoted stop for adjustment to vary its eifective low idle stop position.

5. In combination with an engine governor having a part moveable upon changing the governor setting from low idle to shut down, a pivoted stop member with opposed stop faces engageable by said part in one position as a low idle stop and in the opposite position as a shut down stop, and an off-center spring associated with the stop member to resist its movement from one position to the other, and means mounting the pivotal stop and its oiI-center spring for adjustment as a unit to vary its effective low idle stop position.

RANDOLPH C. BARNES.

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

UNITED STATES PATENTS Number Name Date 1,337,865 Wells Apr. 20, 1920 2,009,995 Engel Aug. 6, 1935 2,047,577 Crafts July 14, 1936 2,231,059 Douglass Feb. 11, 1941 2,270,100 Adler Jan. 13, 1942 2,307,974 Turner Jan. 12, 1943

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