US1116955A - Motor-control mechanism. - Google Patents

Description

M; TIBBETTS,

MOTOR CONTROL MECHANISM. APPLICATION FILED-DBO. a1, 1910.

1,116,955.' Patent ed NOV.10,191 4.

Wad team srArns ratrnn'r orrroE.

- vanced relrtiveto the closing of MILTON- TIBBETTS, OF DETROIT, MICHIGAN, ASSIGNOR TO' PACKARD MOTOE CAR COMPANY, OF lilETRO IT. MIGHFLGAN, A CORPORATION OF MICHIGAN.

MOTOR-GONTIWL MECHANISM.

To all whom it may concern Be it known that I, MiL'ron'Tleenrrs, a citizen'of the United States, and res dentot- Detroit, Wayne-county, State of Michigan,

have invented certain new and useful Immovements in Motor-Control Mechanism, of which the following is a specification.

This invention relates to 'motor control mechanismand'particularly to the control of the throttle valve, the intake values and the spark advancemechanism. .The invention is illustrated as applied to a hydrocarbon motor of the type in which air is compressed in the crankcase or elsewhere and delivered-to the cylinder at or near the end of the intake stroke for the purpose of augmenting the-char e drawn in through the intake valve, and t' e valve control mechanism is particu-larly'applied to the valve in "the'channel through which this augmenting charge of air passes tromthe crank case to the-cylinder;

In a hydrocarbon motor having means for augmenting the charge as above descrrberhit is desirable that the manual control lever shall' act first upon the throttle valve and the augmenting valve to bring them into operation, w opening the augmenting valve shall be adinlet valve as the -motor reaches" higher speed. On the other hand, it is not desirable that the timing of the augmenting valve should be advanced at low speeds even though the throttle may be wide open and the augmenting valve doing full duty. It will be-seen, therefore,

with. the increase in speed of the motor rather: than with the increase in power,

otherwise the incoming charge of air would blowpart of the BXPlOSlVG' charge out through the regular intake valve and back into the carbureter, which it has not time ator or automatically as by a governor.

Itis further desirable to have the entire control of the throttle valve and augmenting- Specificationof Letters .Eatent.

and that thereafter the time of the regular- I that the timing of the augmenting valve should beadvanced- Patented Nov. 1 0, 191a.

Application-filed December 31,1910; Serial Ko.'600,293.

valve under one control lever and the operation of this lever, therefore, would firstbe to open the'throttle valvewide and move the cam shaft to operate the augmenting valve tolts greatest degree, and then to advance the time of opening of the augmenting valve, the latter step being taken only after the motor has reached comparatively high speed. With this, mechanism alone there would be no Way by which the driver or operator could certainly know when he had reached the limit of opening of the augmenting valve and his -only means of knowing that the movement o'f the control lever had passed beyond that stage and to a point where it advanced the time of opening of the augmenting-valve would be by the sand dent decrease-in the power of the motor due to part-of the explosive charge being blown back through the intake valve. To the uninitiated this-condition of affairs would be confusing, and in any event it would be diiiicult to check the progress of the control lever at t-he exact point where the lever began to advance the time of opening of the augmenting valve, and particularly is this true when the controlling lever is operated by the drivers foot. The present invention overcomes: this dii'liculty by providing a checking. device or stop for the purpose of resistingtheoperation of the control lever at a point just before it begins to eflect an advancement of the time of opening of the augmenting valve; This checking device may be in the-form of a rigid stop whereby the advancement referred to can only be eii'ectedatter the stop is withdrawn, or itmay be a yieldingstop whereby the control lever will be-yieldingly resisted at the point referred to and by further pressure thereon it may be operated to advance the timing of the augmenting valve.

The checking device may be connected with the spark control mechanism or itmay be connected with the governor, and in either event it-Will be rendered inoperative when the motor is running at high speed, in thefirst instance becanse the spark is practically always in advanced position when theinotor is running at speed and the driver will, therefore, automatically withdraw the stop as he advances the spark, and in the.

second instance the stop will be automatically withdrawn at high speed by the action of the governor,

lhe objects of the invention are'apparent from-the above and will be brought out more valves on one side thereofg gonegof these, valves being shown in Fig, .Q-andQindiCated by the numeral 11,'an d' withv an augmenting 20. valve l2,;preferably arranged on the othertionsthroughone of the motor-cylinders;-

Fig. 3 shows another fornaof the "means for operating the checking. device; Fig. 4 shows another form of the checking ade-v vice; and Fig; 5 shows a combination ofthe' two previous checking devices.-

1 the drawings are shown two cylinders 10 of el; and exhaust of which is provided with side of the'c ylinder. The inlet and exhaust valves are operated in a well known manner by the cams on the cam shaft 13. driven by operated by a cam shaftjindicated' at 16 Y [which is driven bysimila'r gears Hand 15.

air inlet port 17 isarranged in one. side vof the cylinder so that it is uncovered by the piston '18 only when the-latter is at the top of its stroke to permit -a'- charge of air to be drawn into the crankcase 19, and this port is governed by avalv'e-QO. The.

crank shaft is shown at 2 1 and the connect-- 1 ing. rodQQ connects it with the piston 18.

;The augmenting valve. 12- controls the passage of airfrom the crankcase to the ours. M V I ranged to slide longitudinally by reason ofgas cylinder, this airpassing through the 'channel 23 and the port 24,'which latter 1s ar ranged in the cylinder to be uncovered by the piston at the bottom of its stroke.

.. The cams 25 and 26 onthe" cam shaft 16 are so arranged and proportioned relative to the position of the crank shaft that'the valve 12 is opened at the end of the firing stroke for the purpose of admitting a chargeof air from thecrank case into the cyl-- inder to scavenge the latter and again at the end of the intake stroke for the 'purpose f augmenting the charge of combustible m1xture previously drawn into the cylinder through the regular'intake valve. The. lat-' ter opening of the augmenting valveis overned entirely by} the position'of the cam which operates it, this cam 26 being tapered, as shown particularly in Fig; 1,'so that whenthe cam shaft 16 is theposition;

shown in'full linesin Fig; 1 the cam'26 is inelfective and the valve 12'is not opened;

Iwhereby nb augmentation -of th'e charge oc-' The cam shaft 16, however,'1s-, ar-.

its pin-and-slot connection 27, $8, with the gear 14: shown in Fig. 1 whereby the h gher the angular relation of the shaft l fiand the" gear- 1 11s slightly altered causing an ad- .vancement of the time of'opening the augT a hydro carbon motor 1 each cylinder i 'ble mixture is drawn.

the2 to 1. gears 14' and 15 from'the crank "shaft. The augmenting 'valve 12 is alsoportion of the cam 26 is'ihrought into action a and the valve'12 is liftedmore or less at the end of the intake stroke for the purposeof augmentingthe "charge in the -cylinder.

It willbe seen that the .slot 28 is straight throughoutthe greater part of its length, but that the extreme forward end 29 there, 7 of is arranged at-i?a;- .;fsl ight angle whereby y when the pin 27 is moved into this end 29 menting valve relative to' theposition ofthe" crankshaft or piston and consequently relative to the, time at closing of the regular inlet valve 11 through which the combusti The camshaft 16is.shifted longitudinally it" througha suitable yoke and groove con-' by the shifter rod 30 whichis connected to f 1 s5 necti0n,' the yoke bein'glshown in' Fig. 2' at .30 as entering an annular groove in'the' cam shaft 16; and this rod is connected to I I the'aocelerator edal 31 b th -1 32 and to the hand ontrolrod j33 by the bell crank lever 34' and springs '35 surrounding the link 32 and abutting .againstthe stops 36 thereon."

It win be understood matte madam-r01 ,7 7 rod 33' maybe-locked in any desired p'o'si-l tionby any of' the well ",known devices for this ur ose,- andJ.th e;. accelerator.pedal 31 may e epressed to "operate the shifter .30 v

without disturbin'gthepo'sition of the hand 7 controlrod 33.; I t I s In Fig.1 the intake ipe is shown' at 37 in wh ch is the butter y throttle valve 38' operated by the arm' 39 through the link 40 I v and'rod 41, which latter is connected to the rod 32 through .the spring 42. 'whichis 'ar-- ranged between the. stop 43- on theiod 41 is provided to limit'the opening movement of the throttle valve. 1

and the stop .44 on the rod 32. A; stop 5 7 From the above description will be seen 4 that upon depression'of the accelerator;

pedal 31 the camshaft, 16 is'shifted simulj" v 'ta'neously with the 'opening'o f the throttle 'valve 38 until the latter reaches-its full opening and thereafter the cam shaft 16 is shifted independently, leaving the throttle in Wide open position. It will beunderstood that the low portion of the augmenting cam' may be longer than shown to permit the throttle to be opened 'wide. before theaugmentingvalve'is brought into operation, if desired. When the 'c'am' shaft-'.16 reaches the, position shown in dotted lines in Fig. 1,,a1e augmenting valve 12 isiopening to' the greatest degree, and from said positlononwardly the 'pin27 moves in the-angular part 29 of the slot 28 causing-the timing of theaugment-1 ingaa'zalve'lZto be advanced relative to the position ofthe crank shaft, as above sugv geste d. It will'be observed that with only the mechanism above described-,{the operator is in no position to know when the shaft 16 has reached the position in which it is shown in dotted lines in-Fig. 1, and if he moves the cam shaft 16 to its extreme forward position when the ihotor'is running at low speed, the opening of the augmentmg valve would be sufiiciently advanced-to vancement of the opening of the augmenting alve is useful pnly at high motor blowvpartof the combustible charge out of the cylinder through .the carburetor before the. regular. intake valve was .closed. This could not take place, however, when the motor was runnin menting'air to blow through the cylinder, and it will'be seen, therefore,tha t the ad 'an abutment 47 formed as a part of the mo.

'tor base or crank case, and a block 48 on the shifter rod 30 whereby the'forward movement of the rod 30 is resisted or arrested when the cam shaft 16 reaches the position shown in dotted linesin Fig.1.

In Fi l the wedge 46 is connected throu h'iell crank 49, arm 50 and rod 51 with-t 1e spark advance mechanism, it being understood that the spark advance mechanism mav be eithermanually or governor controlled as in either case the spark is advanced with the s eed of the motor.

As shown in ig. 1 the spark advance mechanism consists of a control lever 52,

bell crank lever 53, rod 54 and 'linkage 55' connected to the rocking part. 56 ofthe mag.- neto 57. The connection of the arm 50 with the spark advance mechanism is 'such that there is no movement of the arm 50 until the control lever 52 is partly advanced-as shown in Fig. 1', but thereafter the bell crank .53

. spring 46*.

strikes the arm 50 and carries the latter with it whereby the wedge 46 is withdrawn and the shifter rod 30 is permitted to continue its forward movement and advance the position of the crank shaft 16. A spring'49 retains the wedge normally in operative posit-ion.

In Fig. -3 the wedge 46 is directly. coupled to a governor 58 of the hydraulic type, which is shown as operating to its' maximum extent whereby the wedge 46 has been withdrawn and the shifter rod 30 may be moved to its fullest extent forwardly for advancing the position of the cam shaft 1-6. v

- Fig. 4 shows anotherform ofchecking de vice comprising a yielding stop '46 and It will be seen that with th s form, the movement of the shifterrod 30 .1s resisted at the proper-point, but by using additional force on the accelerator pedal the 65, 'resistance may be overcome n 1= cam at high speed as there' would not be su' cient, time for the aug--' operative.

shaft 16-advanced to its limit. This checking .device acts to notify the operator that. he has reached the point where the cam shaft 16 is about to be its advance movement.

A- combination of the two previously described forms of checkin devices is shown in Fig. 5 wherein. the we ge 46 is controlled by the spark advance mechanism as in the other case and the yielding stop 46 acts the same as that shown in Fig. 4 until the spark is fully advanced when said stop 46 is ren dered inoperative! I Havingthus described my invention, what I claim is:

1. In a hydrocarbon motor, the combination with the cylinder and a valve mechanism for admitting. thev charge-to the cylin Her. and for'subsequently augmenting said charge, said mechanism having a variable action as regards the augmenting feature thereof, of a'checking device adapted to resist the variable action of said mechanism.

2..-Ina hydrocarbon motor, thecombina tion with t e cylinder and ports therein, means for controlling said ports .to admit a combustible. charge andrto augment said charge, the timiniof said means being variable relative to t e motor crank shaft, and means for varying said timing, of a checking device adapted to resist the operation of said varying means. 3. The combination with a hydrocarbon motor having intake and exhaust valves and a valve for admittin an augmentin charge of air to. the cylin or after thea mission of the explosive charge through the intake valve, of means for. operating said valves including means for advancing the opening of the augmentin valve relativeto the time of closing of the intake valve, means for shift ing the advancing mechanism, and avchecking device adapted to resist the operationlo'f. the shifting means.

4.- The combination with a hydrocarbon motor having intake and exhaust valves and a valve for admitting an augmenting charge of air to the cylinder after the admission of the explosive charge through the intake valve, of means for operating said valves including means for advancing the opening of theaugmenting valve relative to the time of closing of the intake'valve, means for shifting the advancing mechanism, a checking device adapted to resist the operation, of the shifting means, and manually controlled means for rendering the checking device in- 5. The combination with a hydrocarbon motor having intake and exhaust valves and a valve for admitting an au enting charge of air to the cylinder after t e admission of the explosive "charge through the intake valve, of meansfor operating said valves,in eluding means for-advancing the opening of the augmenting valve relative to the time of closing of the intake tnvameahsfr shift-.

ing the advancing mechanism, -a"che.cking device adapted to resist theoperation of the shifting means, and automatic means for ren'dering the checking device inoperative. 6. The combination with a hydrocarbonmotor having intake and exhaust valves and a valve for admitting an augmenting charge of air to the cylinder afterthe admission of the explosive charge through -the intake valve, of means for operating said valves in'-: .cludingmeans for-advancing the opening of the augmenting valve relative to the time of closing offthe intake valve," means forshifting the advancing mechanism, a checking device adapted to resistjthe operation of the shifting means, sparkadvance-mechwnism, and means controlled bythe position of the'spnrk advance mechanism for rendering-th-echecking device inoperative. I

7. In a-h drocarbon motor the combination with t e, cylinder-and the "intake and exhaust mechanism, of a valve mechanisni having a part arranged normally in inoperative position, a, control lever connected to;

brin said part into-operative position, a chec 'n device adaptedto resist ,themo vement 0 said control lever, and means for rendering said checking device inefiective.

8. In a hydrocarbon motor, the combination with the cylinder, theintake and-exhaust mechanism and the throttle valve, of;- a

valve mechanism having a part arranged normally in inoperative position, a control lever adapted to open said throttle valve, a'nd' connections from said control lever to said valve mechanism for moving said partto operative position afterthe throttle-valve is opened a predetermined amount.

9 The combination with a h 'drocarbon motor having a valve, a valveshaft geared to the crankshaft and having means con nected therewith to o erate said valve,,sa1d

' valve shaft -being shiftabl'e to a predeter-.

mined point to increasethe length of time for the opening of said 'valve, means inthe connection between said valve shaft andthe crank shaft whereby; shifting said valve shaft beyond said point causes an advanced opening of said .valve relative to, the crank shaftposition, a manually controlled le'yer. for'shifting said valve shaft,a'nd achecking [mechanism including. an augmentin .valve v device adapted to come into 0 eration to check the shifting movement o; said valve shaft at said predetermined point; 1

10. The combination. vv'th ar'hydrocarbon ,mOtOr having valves and valve operating and a .taperedcam foroperatmg it,o means for shifting said tapered. .cam to increasethe opening of saidvalveland then. advance the time of opening thereof, and a checking .device to resist the shifting movement of said cam for the advance timing eifect witho sxout afiiectingf-the increased open ng efiect.

I 11. The combination with a hydrocarbon motor having valves and valve operating mechanism including an .au'gmentin valve and a tapered cam for operating it, 0 means forshifting said tapered cam to increase the openin ofsaid valve and thenadvance the time of opening thereof, a checking device to resist the shift-ing'movement of said cam for the advance timing effect without affecting the increased openin effect, and means for rendering the chec"ng device inoperative.

- .12..The combination with ajhydrocarbon motor having means-for, augmenting'the charge,: ineans.for regulating the degree of augmentation andmeans for varying the timing of said augmentin vice connected to shift said re lating and .varying means, the partsbelng so construct'ed and arranged that the movement of ,the'shifting device first operates the regulating means to give the greatest degree of augmentation and. thereafter operates the varying 'means to advance the 'timing'of the "augmentingmeans and -a checkin device arranged to resistthe movement of the shiftmg device as it is about to operate. upon the varyin means. Y

' 13. he'combination witha hydrocarbon motor having means for. augmenting the charge, means for varying the timing of said augmenting means, and a spark. advance mechanism, of means for shifting said spark advance mechanism and said varying means whereby the timing of said augmenting means depends upon the position of the spark advance mechanism. a

14;"lhe combination with a hydrocarbon motor having means for augmenting the charge and means for varying the degree {of augmentation and the timing thereof, of .a rod connected to shift said varying means to first increase the degree of augmentation and then to advance the timing thereof, an

abutment, a block on said IO(1 adapted to move toward and from said abutment with the shifting movements of-said rod, a wedge ,betweensald block and said abutment and forming-a check or stop to arrest the move mentLofsaid rod before it begins to effect an advance in 'thetim ing of the augmenting means, a spark advance -mechan1sm,- and means, of a de-.

\ the timing of the augmenting means.

move toward and from said abutment with the shifting movements of said rod, and a yielding stop between said blockjand said abutment for resisting the movement ofsaid ligrod before it begins'to effect an advance in 16, The combination with "a hydrocarbon motor having means for augmenting the charge-and means for varying the degree of augmentation and the timing thereof, a rod connected to shift said varying means to first increase the degree of augmentationand then to advance the timin thereof, an abutment, a block on said ro adapted to 15 move toward and from said abutment with 1 the shifting movements of said rod, a yielding stop between said block and said abut-- yment for resisting the movement of said rod before it be'fiins'to effect an advance in the timing :of t e augmentin means, a-wedge betiweensaid yieldingfievlceand said abutment, a spark advance mechanism, and connections from the. latter to said wed whereby the. wedge is withdrawn when t e sffark is advanced, to permit said rod to' c act an'advancement of the augmenting means'witho'ut interference from said .yield- I a f 7. ahydrocarbon motor thecombinavaryin means.

tionwith the cylinder, means for admitting 3'0 the main charge thereto, means for subsequently' augmentin the admitted charge,- and means adjustab e for varying the timing of said augmenting means, of a checking device adapted to resist the operation'o'f said 85 18. as hydrocarbon motor the Combines tion with the cylinder, means for-admitti mg the main charge thereto,,means'for Subsu- I quently augmenting the admitted charge, 40 and means for varying the timing, of said augmenting means, .of a device for. shifting said timing means, and acheckin device adapted to resist the operationof said Siiliftr 'ing device. y 19. In a'hydrocar'oon motor, the combination with the cylinder, variable means for introducing into the cylinder a volume of air under pressure in addition to the regular charge due to .piston displacement, of a 50 checking device adapted to resist the varyin action of said means.

11 testimony whereof I afiix my signature inthe presence of two witnesses. MILTON TIBBETTS.

Witness es:

" GEO. H. FoUnNmR,

Enwnnn. MILLER.

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