US2410474A - Governor - Google Patents

Description

Nov. 5, 1946. D. L.. zE'lGLr-:R @43,474

GOVERNOR Filed June 22,`1944 2 sheets-sheet 1 l 1 s? 37 m/ l l i .ze -az l 35 2T 4l fe e 55 Ta .sa 24 ,e5 ,26' //`f2? r1:5 ll .'z

9e/bert la el' Patente Nov. 5, V1946 GGVERNQR Delbert L. Zeigler, Rockford, Ill., assignor to Woodward Governor Company,

corporation ol' Elinois Application .lune 22, 1944, Serial No. 541,542

, I 3 Claims.

This invention relates generally to governors having mechanism operable while the governor is operating to adjust the governor speed setting.

One object is to provide a governor having' a plurality of speed adjusting mechanisms interconnected in a novel manner to enable the speed setting to be adjusted in predetermined inerements and also progressively.

Another object is to provide for Yactuating one of the adjusting mechanisms manually andthe other by a uid pressure actuator.

The invention also resides in the simple construction of the adjusting mechanisms and their novel arrangement with the governor into a coinpact unit.

Other objects and advantages of the invention will become apparent from the following' detailed description taken in connection with the acconi-` panying drawings, in which Figure 1 is a vertical sectional View or" a governor embodying the novel features of the present invention, the section being taken along the line l-l of Fig. 2.

Fig. 2 is a section taken along the line E- of Fig. l. Y Y' Fig. 3 is airagmentary view similar to Fig. i showing a different position of the parts,

\ il member are transmitted differentially to the plunger through a lever 35 fulcrumed lntei'-,

In the drawings, the invention is shownor purposes of illustration embodied in a centrifugal governor in which the controllingiorce is derived centrifugally by the rotation or" yweights These project upwardly and are fulcrumed on pins E on a ball-head l xed to the upper end oi? a drive sleeve 8 which is journaledin a bore in a casing lo. The sleeve projects from the lower end of the'casing and is coupled to the rotary parts whose speed is to be measured.

Horizontal arms H on the flyballs bear upwardly against the outer race of a ball bearing l2 whose inner race supports the head i3 on a stem lll reciprocable endwise in the sleeve 8 and carrying lands l and I6. These coact respectively with ports ll and with the lower end oi the sleeve bore I9. If, in response to a detected vspeed increase, the valve stem ld is raised from the position shown, iiuid delivered under pressure -by a pump 20a to a supply chamber 2li ows past the Iand l5 and through a port'2l to a hydraulic servo actuator 22. Lowering of the valve stem from the position shown allows duid from the servo lto drain past the land i6 out of Vthe lower end of the sleeve U -The vertically directed force of the iiyballs is opposed by and balanced against the stress of a coiled compression sp1-ing' 23 bearing at its lower Las Rockford, lll., al

end against the valve stem head i3, and at its upper end against a plunger 2t guided for movement axially of-the speeder spring. The reduced lower, end of the plunger slides in a bore 25 in ahorizontal partition 2 in a casting 2l having a skirt fitting' over the ilyballs and secured to the top of the casing lll, The casting El is formed with a central vertical bore whose wall 28 forms a guide for the larger upper end of the plunger di which is movable upwardly and downwardly to respectively increase and decrease lthe governor speed setting. An adjustable stop screw 25 'threading through a cover 3i! on the casting il serves to limit the upward plunger movement.

Such axial adjustment of the plunger may be effected by movement of either of two actuating members il and 32 disposed on opposite sides of the plunger t and guided for vertical reciprocation in hores 33 and 3d formed in the casting parallel to the ocre 23. The motions of the mediate its ends on the plunger 2i with its ends plvotally connected to the respective actuating members. Herein, the lever constitutes a spur gear projecting through a transverse slot 35 in 'the plunger' and registering slots 3l in the bores 33 and Sil. arcuate series of teeth 33 and 3d on the ends of the gear element mesh with rack teeth d' and @l formed on the adjacent sides ofthe actuating members. antirictien bearings di received on steel shafts '43 pinned tothe plunger 2t and projecting into the slot 3S.

vWith the dierential connection thus provided between the plunger andthe two actuating members, it will be apparent that when either member is held iixed, the lever A35 will fulcrum about this member and the plunger will move up and down as the other member is raised and lowered.

The plunger motion will, of course, be half that of the actuating member.

1n the present instance, the actuating member 3i .is adapted to be moved manually and'by mechanical means. For this purpose, rack teeth ad formed on one side of the member mesh with a pinion d5 fast on a shaft i8 which projects into the casting 2l' and is journaled in bearings 4l. On its outer end, the shaft carries a wheel i8 which may be turned through the mediumA of a cable or the like. Downward movement of the member 3l is limited by a stoy t9, on the lower end of a rod 50 which projectsup through a The gear is fulcrumed on hole i in the member and is adiustably any chored in the cover 30. Y.

, 1 Disposed in a bore 52 in the member 3l is a coiled compression spring 53 acting between a lower end wallr 54 and-a head 55 held by a snap ring 5B on the upper end of a rod 5l projecting upwardly through and guided by the end 54 of the member 3| and having a head 58 on its lower end. A screw-stop 68 on the cover 3o limits the upward movement .of the rod 51. The spring 53 is made substantially stronger than the speeder spring 423 so as to be capable of overcoming the latter spring and moving the plunger 2d to a j. predetermined lposition in therevent that the cable or other part of the connections to the wheel 4B is broken. This position is determinedV by the stops 68 and 59 agamt which the spring '52 expands when the memberl 3l is freed.

Herein, the other actuating member 32 is arranged to be actuated by power controllable from a remote point. For this purpose, it is made in the form of a sleeve and closed at its upper end by a piston si) depressed as indicated at iii and engageable with an adjustable screw stop 62 on the cover 34. A spring 66 enclosed within the sleeve 32 acts between the piston 6o and a pro- .iection 63 on the partition 28 to supplement the4 force of the speeder spring 23 in urging the sleeve and piston upwardly toward the stop S2. The member may be forced downwardly by admitting pressure fluid through a pipe Bt into the cylinder 34 between the cover 30 and the piston et. Under pressure suicient to overcome the spring 66 and the speeder spring 22J the piston is moved downwardly until the lower end of the member 32 strikes a stop shoulder B1.

Let it be assumed that the parts are positioned i as shown in Fig. 3, the spring SB-holding the actuating member 32' upwardly against the stop 62 in the low speed position of the latter.

` Changes in the governor'speed vsettling may then be made by turning the wheel 4a, thereby moving.

the member 3l up or down. In this movement, the lever 35 fulcrums on the then ilxed member I2 and the plunger 24 is moved in the same direction as the member 3| but through half the (Fig.r 3) and through a high speed range when the member 32 is in its high speed position (Fig.

l). .By energizing the hydraulic actuator, the

i, deflection of the Speeder spring .may be increased ordecreased in a fixed increment and the speed setting of the governor shifted from one range -to the other. Such shift may be effected quickly and is controllable from a remote point.

I claim as my invention:

1. Agovernor comprisinga Speeder spring, ro-

tary speed responsive means opposing the force of said spring. a member mounted for movement in a rectilinear path and in opposite directions to increase or decrease the force applied by said spring, a gear element mounted on said member to turn relative thereto about an axis extending transversely of said path, said gear element having arcuate rows oi teeth arranged on opposite sides thereof concentric with said axis, rack element meshing with said gear element on opposite sides of said member so as to have a rolling connection therewith, means guiding said elements for rectilinear movements parallel to said path, means selectively operable to movevone to turn relative thereto about an axis extending distance. When the member 3l is in its lower limit position against the stop 49, the maximum speed setting obtainable by movement of thisv member obtains. As the member is raised, the control speed of the governor is decreased progressively. If the member 3l is raised above the position at which the rod $1 engages the stop 59, the spring 53 is compressed in the continued rise of the member to a high speed position which may be limited by stops (not shown) associated with the cable actuator.

transversely of said path, said gear element having arcuate rows of teeth arranged on opposite sidesthereof concentric with said axis, rack ele ments meshing with said gear element on opposite sides ofl said member so as to have a rolling connection therewith, means guiding said elements for rectilinear movements parallel to said path; means for moving one of said rack elements back and forth to fulcrum said gear element about the other rack element and thereby move said member, and means for actuating said otherl rack element to fulcrum said gear element about the iirst rack element and correspondingly move 4said member.

Now if it is desired to increase the governor speed setting quickly, fluid at a pressure sumcient to overcome the springs 23 and 66 is admitted to j the cylinder 24 whereupon the member 32 is forced downwardly to its high speed position (Fig. 1). The lever 35 will fulcrum on the member 3i and the plunger 24 will be moved downwardly a corresponding distance further compressing the lSpeeder spring 28 -a iixed amountl With the member 82 in its new position, the member 3l may be moved up or down to effect a further adjustment of the governor speed setting. In this way, the governor is adjustable by the member 3| through a lower speed range when the member 32 is in its low speed position 3. A governor comprising a resilient speeder element, rotary speed responsive means opposing the force of said element, a 'member guided for movement in a rectilinear path and in opposite directions to increase or decrease the force applied by said element, a lever ulcrumed intermediate its ends on said member to turn relative thereto about an axis extending transversely of said path, an actuating member pivotally connected to one end of said lever and guided-for movement parallel to said 'path between two spaced positions, a spring urging said actuating member to one of said limit positions, power actuated means adapted when energized to overcome said spring and move said actuating member to said other limit position, a second actuating member pivotally connected to the other end of said lever, and mechanism selectively operable to 4adjust the position of said second actuating member progressively.

' lDElIJBER'l` L. ZEIGLER.

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