US1606170A - Controlling mechanism for carburetors - Google Patents

Description

Nov. 9 1926.

. L. W. MELCHER CONTROLLING MECHANISM FOR GARBURETORS Filed Sept. 17 1923 O wim@ Patented Nov. 9v, 1926. i

Unirsesra'rEsj LEE W. MELCHER, E WEST DE PERE, WISCONSIN, AssIeNoE vToEterna/tav I/IoToEs CORPORATION, OP DE PERE, WISCONSIN-,A CORPORATION oEWIsCoNsIN. i

CONTEOIQLING MECHANISM EOEl CAEBUEETOEsf Appiication filed september 17, 1923. `serial Nassau?.

The invention relates to controlling mechanism for carburetors used With internal combustion engines and its object is to provide improved controlling devices which are adapted to control the Vcarburetor from a remote point, such as the" cab of amotordriven railroad car. Anotherobject of the invention is to provide improved controlling devices which are adapted for very minute adjustments, so that when a plurality of motors are used on a single car, they will be accuratelycontrolled to attain the desired synchronism between the motors. Other objects of the invention will appear from the specification.

rlhe invention consists in the several novel features hereinafter set forth and more par ticularly defined by claims at the conclusion hereof. l

In the drawings: Fig. 1 is a plan of a motor providedvWith the invention. Fig. 2 is a side elevation. Fig.` 3 is a horizontal section through the controlling devices. Y The invention is exemplified in connection with a motor comprising cylinders 5in any desired number and around which is formed the usual Water jacket 6 for cooling the motor. The motor is provided With the usual Water circulating system, such as a pump 9, which receives, through the pipe 10, Water from a radiator (notshown) and forces it through a pipe 11 into the Waterjacket around the motor r cylinder and through a discharge manifold 8 into the radiator. Since these parts may be of the usual construction, it has not been deemed necessary to illustrate them indetail'. The pumpand its connections serve to circulate Water through the Water-jacket around the cylinders, and the pump is, as usual, driven by the motor... The latter is mounted on sills 12 which are supported by frame-bars 13 Which aresuitably secured to the car. Combustible fluid is 'delivered from a carburet-or 15 through the usual pipe and manir fold Which is connected in the usual manner to deliver the Huid by suction into the motor cylinders, as Well understood in the art. The carburetor is provided with the usual throttle-valve 14 for regulating the flow of combustible fluid to the cylinders and correspondingly controlling the speed of the motor. The shaft 16, on which this throttle is mounted, is provided With an arm 17 Which is operable by the controlling mechanism hereinafter set forth to regulate andvary .the speed of the motor.

` The improved controlling mechanism for the carburetor comprises a regulator', which is vadapted to be operated responsively to the pressure of the coolingliquid in the Water jacket',"a1id an air operated device, controllalble at V'Will to operate the throttle valve, subject to the variations'in' pressure .in the cooling liquid; A Vlever 20, lWhich is.`centrally pivoted at 22 to the fixed frame-bar 21, and to one endof this lever is connected at 24,'a rod 28, which has its otherl end pivotally connected to the throttle arm 17. The other end s pivoted to a stem 25 which is adapted to' be operated by a diaphragm'26 which has its margin confined between the sections ofv avcasing 27 .j An air pipe 28 is connected to deliver air into one side of the casing Ato operate the diaphragm in one direction. yPipe 28 is connected to deliver compressed vair under control of an operator-s valve from a suitable source of 'air supply, such as an air tank carried by the car and kept automatically filled by the motor, as exemplified in an application iiled by me March 5, 1923, Serial No. 622,7 51. A valve 29 exemplifies one which is located atany controllingstation and whereby the operator may "cause air under pressure to flow into the diaphragm casing 27 to operate diaphragm 26 and the controller lever 20, the ext-ent of movement of the lever depending upon the pressure of the air 'admitted to the casing 27. The diaphragmpperated stem 25 is slidably mounted in a plug 37, Which is threaded into one section of dia` phragm casing 27. This casingis supported by a fixed bar 38 which is clamped betiveen a shoulder of the plug 37 and one kend of the'casing 27. A spring 30,.coiled around a rod 31`Which has one of its ends pivoted,V as at 32, to lever 20, is interposed betweenframe-bar 21 and an adjustable nut 33, Which is screivfthreaded to rod 31." This springservesy to'normally hold the lever 20 vinposition to close the throttle, and by adjusting the nut 33, the resistance of the spring to the movement of the lever may be 1 varied Within the desired degrees.

The regulator, which is responsive to the fiucutations of pressure in the Water-jacket, comprises a diaphragm 34: which has its margin secured in a casing 35 whch is `formed of sections. One side of said casing is contese side of the casing 35'and said stem isl pivoted, as at 42, to the controller lever 20, Head 40 is adapted-to be operated in one direction by diaphragm 34, so that the pressure of the fluid in the water jacket and against said diaphragm will constitute a resilient resistance which is automatically variedby thepressure of the cooling liquid to automatically control, in conjunction with the pressure against diaphragm 26, the operation of lever 20 to control the throttle 14. Lever 2O is guided in a loop 44 which is fixedto frame-bar 21 and an adjustable-screw 45 is secured inthe outer end of said loop to limit the outward movement of the inner end of'tlie'lever. A valve 47 is included in pipe 36 between the water-diaphragm and the water jacket, so that the water-operatedV regulator may be rendered inoperative if desired.

In operation, the pressure against diaphragm 34 is variable and in accordance with the speed of the motor, since this varying pressure is generated through the circulating pump which is driven by the motor. The operator will control the throttle through valve 29 by which compressed air will be delivered against one side of' the diaphragm 26 which will cause -it to operate stem 25 and lever 20' against the force of spring 3() and also against the force. of the water pressure against diaphragm 34, The operation of the lever 20 by the compressed air will sh-ift rod 23 to correspond-v ingly open the throttle 14 which controls the supply of combustible fluid to the motor cylinders. Assuming air of a given pressure to have been admitted to the casing of diaphragm 26, to operate the throttle for a given speed of the motor, any fluctuations in the speed of the motor will cause corresponding variation in the pressure of water against the diaphragm 34 to automatically regulate the position of lever 2() so as to operate the lever 2O to partially close the throttle in degree correspondingl to the pressure variation of the water in thewater-jacke't. Thev pressure of air` against the diaphragm 26, which is variable, atfthe Vwillof the opera-tor through valve V29,l regulates the speed of the motor generally. The variation of the water pressure against diaphragm 34 exerts the ground pressure to lever 2O which is variable according to the variation in the speed of the motor and consequently th-e controlling mechanism is adapted to provide a very minute adjustment by which the desired speed may be maintained and which is of advantage in instances where it is desired to" synchronize the operation of a plurality of motors.

TheV invention exemplifies improved controlling mechanism for an internal combustion motor which is adapted to be controlled .from a remote point and in which the varying pressure of the cooling liquid .in the water-jacket is used in regulating the speed rot the motor under control of the air-operated diaphragm which is controllable at the will of the operator. rlhe purpose of providing an adjustable spring pressure for the lever 20 is to permita plurality of motors toibo identically adjusted to operate atthe same speeds, notwithstanding a variabler action in the governor, due to friction or otherwise.

rlhe invention is not to be understood as restricted to details set forth, since the-se may be modified within the scope of the appended claims, without departing from the spirit and scope of the invention.

Having thus described the invention, what I claim as new and desire to secure by Letters Patent, is: I

1. The combination with a water-jaclreted motor, of a throttle for controllingA the supply of fuel thereto, and mea-ns for controlling t-he throttle comprising a lever connected to said throttle, a fluid regulator connected to said lever and responsive to Huctuations of pressure in the Water-jacket, a device operable by compressed` air and connected to shift the lever to open said throttle, and an adjustable spring tension device connected to and adapted to retract said lever.

2. The combination with a water-jacleted motor, of a throttle for controlling the supply of fuel thereto, and means for controlling the throttle comprising a lever connected to said throttle, a fluid regulator con- :nectedV to said lever and responsive to fluctuationsY of pressure in the water-jacket, a diaphragm operable by compressed air and connectedto shift the lever to open said throttle, and adjustable spring means connected to and adapted to retract said lever.

Signed at Green Bay, iVis., this 5th day of September, 1923. l

LEE W. MELCHER.'

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