US2003403A - Carburetor - Google Patents

Description

June 4, 1935. H. H. TIMIAN CARBURETOP 7 Filed Oct. 26, 1952 2 Sheets-Sheet l INVENTOR.

H. H. TIMIAN June 4, 1935.

CARBURETOR Filed Oct. 26, 1932 2 Sheets-Sheet 2 INVENTOF. flfi'mz'an 17am! d ATTORNEY.

Patented June 4, 1935 UNITED STATES CARBURETOR.

Harold H. Timian, Detroit, Mich., assignor to Continental Motors Corporation, Detroit,

Mich a corporation of Virginia Application October 26, 1932, Serial No. 639,731

22 Claims.

My invention relates to engines and more particularly to means for controlling the throttle valve and mixture of a carburetor associated with a hydrocarbon motor.

.Heretofore it has been customary to provide a single control for the throttle valve of the engine and a separate control for the choke valve of the carburetor most generally employed to facilitate starting of the engine. Because the throttle valve is usually adjusted for idling operation of the engine, it is customary to provide an additional throttle valve control (usually a hand device) which can be actuated when desired to partially open the carburetor throttle valve to I facilitate engine starting or road speed settings.

It has been proposed to provide means for interconnecting the throttle and choke valves of a carburetor so as to progressively open the throttle valve as thechoke valveis closed, but with such devices, it is found that in most cases the throttle valve is opened an excessive amount when the choke valve is fully closed resulting in waste of fuel and racing of the engine on starting. The speeding up of an engine after start- 0 ing is usually desirable so as to more quickly obtain a uniform distribution of the fuel mixture and more particularly it is desirable to quickly sweep out wet fuel accumulations in the manifold after starting the engine to obtain the desired efficient engine performance. The speeding up of the engine will effect this result but with engines of the aforesaid type it is necessary to open the choke valve and adjust the throttle valve by the single control employed in controlling engine operation. It will thus be noted that efiicient engine performance on starting is largely dependent on the skill of the operator and excessive amounts of fuel are usually consumed in startingthe engine as a result of carburetor flooding by improper or inaccurate manipulation of the above controls. In addition such improper manipulation of the controls often result in engine stalling due to carburetor flooding.

It is desirable to open the throttle relative to the idling position to facilitate engine starting and then to open the throttle further subsequent to starting the engine on opening the choke valve. Racing of the engine at the start is undesirable and with the constructions as heretofore used that employ separate controls for a throttle and choke valve, which are manually controlled and dependent on the skill of the operator, operation of the engine under destructive conditions usually results.

By employing a carburetor with interconnected throttle and choke valves, engine starting is materially facilitated and in view of the many difficulties and unsatisfactory results obtained with constructions of this type as heretofore proposed, it is plainly seen that improvementsin the cooperative action and control of throttle and choke valves would result in highly improved engine performance especially in starting.

An object of my present invention is to improve 1 engine performance by providing a control for the throttle valve and mixture of the carburetor whereby engine starting is facilitated and the engine performance is improved without th diiiiculties'heretofore encountered.

Another object of my invention resides in facilitating engine starting and in generally improving engine performance by p oviding a carburetor and associated throttle and'choke valve controlling means whereby to successively adjust the carburetor and choke valve and in particular to effect a closing of the throttle valve'in the direction of its idling position on closing the choke valve-and vice-versa to effect a partial opening of said throttle valve on opening the choke valve for sweeping out wet fuel accumulations in the manifold subsequent to engine starting with a minimum of fuel consumption.

Other features of my present invention relate to a carburetor and the improved means for operatively connecting the throttle valve and choke valve to a single hand device whereby to control the aforesaid valve adjustments, and further I contemplate the construction of a hand device control that may be readily located in predetermined positions for facilitating carburetor, and engine speed control. I

A further object of my invention is to construct animproved compact controlling means for the throttle valve and choke valve of a carburetor 40 by providing a single hand device operable to adjust said valves and arranged solely to'adjust the throttle valve during the first part of its movement and to adjust both the throttle and choke valves during the last part of its movement.

For a more detailed understanding of my invention, reference may be had to the accompanying drawings which illustrate one form which my invention may assume, and in which:

Fig. l is a side elevational view of an engine 5o illustrating a carburetor and my improved control mechanism associated therewith.

Fig. 2 is an enlarged side elevational view of the carburetor with the throttle valve in idling position,

Fig. 3 is an end view of the carburetor shown in Fig. 2 as seen from the section line 3-3 of Fig. 2,

Fig. 4 is a detail sectional view of the throttle valve shaft and its connections with the actuating mechanism taken on the line 4-4 of Fig. 2,

Fig. 5 is a side elevational view of the carburetor and associated control mechanism showing the throttle valve in an open position as adjusted by means of the hand device and associated connections,

Fig. 6 is another side elevation of the carburetor and associated connections illustrating V the throttle valve positioned for engine starting,

Fig.7 is a side elevational view of the carburetor and associated connections illustrating the action of the throttle control independent of the choke valve operation, I

Fig. 8 is a fragmentary elevational view of a modified form of construction showing the throttle valve in idling position,

Fig. 9 is afragmentaryelevational view of the modified construction as shown in Fig. 8 and showing the throttle valve in a position similar to the position of the throttle valve in Fig. 5,

Fig.l0 is a similar elevational View of the modified construction illustrating the throttle valve positioned for engine starting;

Fig. 11 is a similar fragmentary elevational view of the modified construction illustrating the operation of the'throttle valve adjusting means independent of-the choke valve operation, and

Fig. 12 is anend elevational view of the mechanismfor adjusting thevalves shown'inthe modified construction of Fig. 8 as seen substantially from theline -l2--l2 of Fig. 8.

In general, my improvement is adapted for assembly with a carburetor A= associate'd'with an engineB of theinternal combustion type. The engine herein illustrated 'in-Fig. 1 includes an engine block In constructed in the usual manner and providedwith intake and exhaust manifolds H and 12 respectively, said'intake manifold having a primary'fuel mixture conducting portion I3 adapted'to be connected with the outlet of the carburetor A. i 1 This carburetor A is provided with the usual throttle valve I4 of the butterfly type which is preferably fixed or otherwise secured to the shaft 15 supported by the carburetor casing: A choke valve [5 also preferably of the butterfly type, is associated with the carburetor'air intake and is adapted to control the mixture of the carburetor. A hand-device C preferably supported on the instrument board of the vehicle D is adapted for connection with a carburetor throttle valve andmixture control as will be more apparent as the description progresses. -The'hand device C preferably consists of a button If! to'which is connected apush and pull device such-as a Bowden-wire I9 which may be supported within the usual conduitZD, the end of said conduit'lfl being supported by a suitable clamp or other fastening device 2 I to the carburetor casing. The free end of the .Bowden wire I9 is positively'connected to an actuating element orcam element 22 as at 23. This'element 22 is pivoted to'the carburetor as at 24 and acts as a lever in connection with the devices for controlling-the adjustment of the choke valve 16. In the'illustrated embodiment of my invention I have provided a link 25 connected to the element 22 as at-ZB, the free end of this link beingprovided' with a slot 21 in which is engaged a pin 28'carried'bythe arm or lever 29 which is in turn positively connected with the choke valve-l 6.

A spring 30 is connected with the extension 3| of said arm 29 and tends to urge the choke valve into an open position as illustrated in Fig. 2, said extension 3! being adapted to engage a stop 32 limiting the opening movement of said choke valve. The slot 21 of the link 25 provides a lost motion connection in the mechanism which actuates the choke valve so that initial movement of the hand device will not vary the adjustment of said choke valve, but when said lost motion is taken up, actuation of the choke valve begins and in the construction herein illustrated the closing of said choke valve, by means of the hand device, preferably takes place during the final movement of the hand device C.

The throttle valve 14 is preferably actuated by means of the hand device C during the initial movement of the button [8. In the illustrated embodiment of my invention this is accomplished by means of the movement of the lever or throttle valve actuating element 35 that is positively connected to the shaft I 5 of the throttle valve structure by means of a pin or other suitable fastening device 35. The actuating element 22 is provided with a cam portion 3'! arranged for cooperative engagement with the cam surface 33 carried by the actuating lever 35. The cam has a cam surface 3! which is eccentric with respect to the axis of rotation of said cam. A spring 39 or other yielding means is provided for urging the throttle valve to its idling position as shown in Fig. 2 and preferably I have provided a spring 39 coiled on the shaft I5 exteriorly of the carburetor casing and which has one end engaged with a lug 40 of the carburetor casing and the other end engaged with the actuating lever 35 as at 4|. Preferably an adjustable stop 42 is provided for limiting the movement of the actuating lever 35 whereby to provide means for adjusting the idling position of the throttle valve [4.

The adjustment of the throttle valve by means of the hand device C is obtained by reason of the cooperative action of the cam 31 with the cam surface 38 of lever 35. The operation of the carburetor control is as follows: In Fig. l I have illustrated the three critical positions of the button I 8, the position I in full lines shown in Fig. 1, corresponds to the position of the valves; as shown in Fig.2, the dotted position II in Fig. l corresponds to the position of the valves as shown in Fig. 5 and the position III shown in Fig. 1 corresponds to the position or" the carburetor valves as shown in Fig. 6. Movement of the button I8 from I to II may be termed the initial movement of the hand device, while movement of the button from positions II to III may be termed the final movement of the hand device.

1 The initial movement of the hand device rotates the actuating element 22 from the position shown in Fig. 2 to that shown in Fig. 5 and thus the cam 31 acts upon the lever 35 to move the same and thereby adjust the throttle valve in a relatively open position with respect to the idling position as illustrated in Fig. 2. It may be noted that movement of the actuating element during the initial movement of the hand device is such as to substantially take up the lost motion in the connections operating the choke valve, and it will be noted that the pin 28 has moved to the other end of the slot 2'! and is now positioned so that further movement of the actuating element 22 and link 25 connected therewith will move the lever 29. Movement of the button [8 from position II to III, referred to above as the final movement of the hand device, will further rotate the actuating element 22, and by reason of the link and lever connection of the element 22 with the choke valve, it will be noted that the choke valve is moved to a substantially closed position (see Fig. 6). This movement of the actuating element 22 moves the cam 31 in such a manner as to engage the lever 35 with the portion 3'! of the cam. Thus the lever 35 by reason of the spring 39 that tends to urge the same against the cam surface will be moved into a position as shown in Fig. 6, thus moving the throttle valve part way towards the idling position, that is, the passage at valve I4 is decreased in cross sectional area, with respect to the area of the passage as shown in Fig. 5, but is relatively greater than the area in Fig. 2 (idling position). This position of the throttle valve as shown in Fig. 6 may be termed the starting position of the throttle valve as the aforesaid starting position is the one most suitable for action in connection with engine starting.

In order to start an engine of the internal combustion engine type when cold, it is usually necessary to choke the carburetor, in other words, to close the choke valve so as to restrict the amount of air entering the carburetor and to provide a relatively rich mixture which may be readily ignited. With the structure as shown in the illustrated embodiment of my invention, the throttle valve is opened slightly with respect to the normal idling position to facilitate engine starting, but when the engine is started the hand device controlling the adjustment of the carburetor valves is operated to open the choke valve so as to not flood the carburetor. The return of the hand device from position III to I after starting the engine will first open the choke valve and open the throttle valve further due to the action of the cam as the high point 31 of the cam is brought into engagement with the lever 35, and then the lever 35 is returned to position shown in Fig. 2 which is reached when the button 3 is in position I as illustrated in Fig. 1 whereby to return the throttle valve It to idling position and to open the choke valve l6; When the button I8 is moved from III to II position the lever 35 is moved counterclockwise as viewed in Figs. 5 and 6 or in other words, the lever 35 is moved to the right to open the throttle valve l4 relative to the position illustrated in Fig. 6. When the button it is moved from II to I position, the lever 35 is moved clockwise or to the left, thus moving the valve M to idling position.

In the operation of the vehicle employing a power plant as shown in the accompanying drawings which is provided with a carburetor and valve controlling device as herein illustrated, it is customary to provide a separate throttle valve controlling device for regulating the speed of the engine. In my present construction I have provided a lever 50 rotatably and freely supported on the throttle valve shaft l5. The lever 35 which is positively connected to the shaft 15 is provided with an extension 5| adapted for engagement with the lever 50. A rod 52 is connected with the free end of lever 50 as at 53 and the other end of said rod is connected with a foot pedal or accelerator 5 so that on depressing the pedal 54 the rod 52 is moved to the left as shown in the drawings, thus moving the lever 50 in an anti-clockwise direction; Fig. '7 illustrates the action of the lever 50 and it will .be noted that the same has been moved the full extent of its travel and by reason of the engagement of the lever 50with the extension 5| carried by lever 35, it will benoted that the throttle valve has been opened wide. It will be also noted that the lever 35 is free to move away from the cam 31 carried by the actuating element 22 and thus the adjustment of the throttle valve I4 by meansof the aforesaid control device designated by reference characters 50 to 54 inclusive may be obtained independently of the choke valve operation. It may be further seen that this throttle valve adjustment by means of accelerator pedal 54 is also obtained independently of the operation of the hand device C.

- If desired, suitable means may be employed for readily locating the cooperating parts of the mechanism in certain predetermined positions. One way in which this may be accomplished is by notching the cam element as at 31, the rounded portion or bump 35 on the lever 35 engaging in this notch. This open portion of the throttle valve may be such as to provide a vehicle speed of approximately thirty miles or any other predetermined speed found desirable. Other means may also be provided for locating or positioning the throttle valve in intermediate positions, and in the structure herein illustrated I have shown one means for accomplishing this which consists in providing a notch 35 in the cam face 38 on lever 35 adapted to be engaged by the high point 31' of cam 31.

In Figs. 8 to 12 inclusive I have illustrated a modified construction which functions in accordance with the principles incorporated in the structures shown in Figs. 1 to '7 inclusive. In this modified construction I have provided an actuating element 69 which is positively secured to the shaft 15 of the throttle valve structure. The levers 35' and 5! respectively, actuated by means of the hand device C and foot pedal 54, are freely mounted withrespect to the shaft l5. The actuating device 68 has an ear-or lug 6| adapted for engagement with the. lever 5i and a lug or ear 52 adapted for engagement with the lever 35". It will thus be seen that actuation of the hand device C moves the lever 35 by reason of the cam action as described in connection with the structure shown in Figs. 1 to 7 inclusive and this movement of lever 35 by reason of the engagement of the lug 52 moves the throttle valve I 4 and the adjustment of this valve 14 in positions shown in Figs. 8, 9, and 10' correspond to the positions shown in Figs. 2, 5

and 6. It will be noted by observing Fig. 9 that movement of the actuating device 60 will not aifect the movement of the lever 51' as the lug or ear 6! moves away from the lever 5|. However, on actuating the foot pedal 54 movement is imparted to the lever 51 and by reason of the engagement of said lever 5| with the lug 6| the actuating device 53 may be moved to adjust the throttle valve. In Fig. 11 I have illustrated movement of the lever 5i for opening the throttle valve to its fullest extent. It will be noted that on actuation of the actuating element 50 by means of the foot pedal, that the lever 35 is not actuated since the lug 62 is free to move away from engagement with the lever 35 (see Fig. 11). I have provided a spring 63 coiled about the shaft l5 for acting on the actuating element 60 and tending to return the valve H! to the idling position as shown in Fig. 8, one end of the spring 63 engaging a lug 64 carried by the carburetorcasing and the other end of the spring preferably engaging the actuating element 50, and as shown in Fig. 12, this end of the spring engages lug Bl.

The mechanism herein described and illustrated provides a control for the throttle valve and fuel mixture of the carburetor whereby engine starting is facilitated and an improved engine performance is obtained. It will be. noted that the throttle valve is so controlled by my mechanism that the-properradjustment of the same is obtained for. engine starting and the rapidity .in which the. wet fuel accumulations. in the intake manifold are-disposed of after engine starting is obtained by opening the throttle valve while opening the choke valve when thechoke button 18 is returned to its normal position as illustratedin Fig. 1 is carried out with a-rm'nimumiofiuel consumption. I find that the'construction herein illustrated provides for "an .automatic .control of carburetor. :andwill prevent excessive racing of theengine with the attendant wear and tear on the moving parts of the engine.

Although I have illustrated but one embodiment of my invention, and have describediin detail but a single application thereof, it will be apparent to those skilled in the art' to'vvhich my invention pertains that various modifications and changes may be made therein without departing from the spirit of my invention or from the scope of the appended claims.

What I claim as my invention is:

1. In a carburetor provided with a throttle valve, a choke valve for the carburetor, and means for actuating said valves including an actuating member positively connected to said throttle valve, a hand device, a lost motion connection for connecting the hand device with said choke valve, said means constructed for operative connection with said actuating member for operating said throttle valve, said lost motion connection acting to permit actuation of the throttle valve prior to actuation of the choke valve, and throttle valve actuating means acting on said actuating member for operating said throttle valve independently of said hand device operation. 7

2. In a carburetor provided with a throttle valve, a choke valve for the carburetor, a single hand operated control for said valves and including a hand device and connectionsintermediate I said hand device and valves, said connections including connecting devices for opening said throttle valve from a predetermined idling position on initial actuation of said hand device, and other connecting devices having a lost motion connection with the choke valve for closing said choke valve subsequent to the opening of said throttle valve, said first mentioned connecting devices being further actuated while closing said choke valve to move said throttle valve towards its idling position.

3. In a carburetor provided with a throttle valve, a choke valve for the carburetor, a single hand operated control for said valves and including a hand device and connections intermediate said hand device and valves, said connections including connecting devices for opening said throttle valve from a predetermined idling position on initial actuation of said hand device, and other conn cting devices having a lost motion connection with the choke valve for closing said choke valve subsequent to the opening of said throttle valve, said first mentioned connecting devices being further actuated while closing said choke valve to move said throttle valve part way only towards its idling position.

4. In a carburetor provided with a throttle valve, a choke valve .for the carburetor, a single hand operated control for said valves and including a hand device and connections intermediate said device and said valves, said connections constructed to solely actuate said throttle valve during the first part of the movement of said hand device whereby to effect a part throttle setting for-.facili-tating engine starting, and touactuate said choke valve'during the final movement of said hand device, and .other means for adjusting said throttle valve independently of said choke valve.

5. In a carburetor. provided with a throttle valve, a choke valvefor the carburetor, a single hand operated control for said valves and including a hand device and connections intermediate said device and said valves, said connections constructed to solely actuate said throttle valve-during the first part of the movement of said hand device whereby to open the throttle valve an amount sufficient to facilitate engine starting and to actuate both said choke and throttle valves during the final movements of said hand device whereby to close the choke valve.

6. Ina carburetor provided with a throttle valve, a choke valve for the carburetor, a single hand operated control for said valves and including a hand device, an actuating member positively connected with said throttle valve, and cam means operated by said hand device for progressively moving said throttle valve intermediate an idling position and a part open position, said cam means and member having cooperating notches and projections for locating said mecha- IliL-illS to position said throttle valve in one or more predetermined open positions intermediate said part open and idling positions.

7. In a carburetor provided with a throttle valve, a choke valve for the carburetor, a single hand operated control for said valves and including a hand device, apivotally supported cam and an actuating arm associated with said cam, said arm arranged for movement simultaneously with said cam, a throttle valve actuating device positively connected with said throttle valve, a lever adapted for engagement with said device and operated by said cam to adjust said throttle valve, means connecting said arm with said choke valve, and a manually operated lever having relative movement with respect to said throttle valve and adapted for engagement with said throttle valve actuating device for actuating said device independently of the choke valve operation, and spring means acting on said throttle valve actuating device tending to return said throttle valve to idling position.

8. In a carburetor provided with a throttle valve including a valve element and a shaft, a choke valve for said carburetor, a single hand operated control for said valves and including a hand device, connections between said hand device and choke valve, a cam associated with said connections and operated by said hand device, means positively connected with said shaft and operated by said cam to adjust the throttle valve, and an additional manually actuated means supported freely on said shaft, said first means having an extension engaged by said second means whereby motion of said second means is transmitted to said first means to adjust said throttle valve.

9. In a'carburetor having a throttle valve and a choke valve, control means for said valves including a hand device and associated connections between said hand device and said valves for opening said throttle valve while said choke valve is stationary in open position-and in advance of a closing movement of said choke valve, and other means for adjusting said throttle valve independently of the'choke valve.

10. In a carburetor having a throttle valve and a choke valve, control means for saidvalves including a hand device and associated connections between said hand device and said valves for opening said throttle valve in advance of a closing movement of said choke valve, said connections including a lost motion device cooperatively associated with said choke valve whereby to effect a closing of said choke valve subsequent to the initial opening movement of the throttle valve.

11. In a carburetor having a throttle valve and a choke valve, control means for said valves including a hand device, means connecting said hand device and choke valve and including a lost motion connection whereby to permit initial operation of said hand device without efiecting an adjustment of said choke valve, actuating elements actuated by said hand device whereby to adjust said throttle valve during initial operation of said hand device, and means acting on said actuating elements for adjusting said throttle valve independently of the choke valve adjusting means.

12. In a carburetor having a throttle valve and a choke valve, control means for said valves including a hand device, connections between said hand device and valves including a lost motion connection associated with said choke valve, whereby operation of said hand device successively opens said throttle valve only part way to facilitate engine starting and then closes said choke valve, and yielding means tending to open said choke valve whereby to return said choke valve to open position on reverse operation of said hand device.

13. In a carburetor having a throttle valve and a choke valve, control means for said valves including a hand device and connections between said hand device and said valves, said connections including an element positively connected with said throttle valve and movable independently of the connections between said hand device and choke valve, said connections including means acting on said element for opening said throttle valve from an idling position during initial movement of said hand device, further movement of said hand device acting through said connections for adjusting said throttle valve to a relative less open position and for adjusting said choke valve to a closed position, and other means acting on said element to adjust said throttle valve independently of the adjustment of said valves by said hand device.

14. A fuel mixture forming device for a hydrocarbon motor including a throttle valve, a choke valve, a hand operated control for said valves and including a hand device and connections intermediate said hand device and valves, said connections including connecting devices for opening said throttle valve from a predetermined idling position only part way on initial actuation of said hand device to facilitate starting of said hydrocarbon motor, and other connecting devices having a lost motion connection with the choke valve for closing the choke valve subsequent to the opening of said throttle valve.

15. In a carburetor provided with a throttle valve, means positively connected to the valve for operating the latter, a manually controlled means including a hand device and associated connections operable on said throttle valve to open said valve from an idling position and then to move same towards its idling position on movement of said'hand device in the same direction, a choke valve for the carburetor, and means actuated by said device to adjustsaid choke valve.

v 16. In a carburetor provided with a throttle valve, actuating means positively connected to the valve for operating the latter, manually controlled means for operating said valve and including a hand device and an actuating element, the latter operatively connected with said actuating means to open said valve from an idling position and then to move same towards its idling position on movement of said hand device v in the same direction, and a choke valve structure for the carburetor, said actuating element operative on said choke valve structure to adjust same.

17. In a carburetor provided with a throttle valve, actuating means positively connected to the valve for operating the latter, means for operating said valve and including a hand device and an actuating element, the latter operatively connected with said actuating means to open said valve from an idling position and then to move same towards its idling position on movement of said hand device in the same direction, and a choke valve structure for the carburetor, said actuating element pivotally supported and operative on said choke valve structure to adjust same.

18. In a carburetor provided with a throttle Valve, actuating means positively connected to the valve for operating the latter, means for operating said valve and including a hand device and an actuating element, the latter operatively connected with said actuating means to open said valve from an idling position and then to move same towards its idling position on movement of said hand device in the same direction, and a choke valve structure for the carburetor, including a shaft, a valve element and a lever secured to the shaft, said actuating element operatively connected with said lever to adjust the choke valve. 7

19. In a carburetor provided with a throttle valve, actuating means positively connected to the valve for operating the latter, means for operating said valve and including a hand device and an actuating element, the latter operatively connected with said actuating means to open .said valve from an idling position and then to move same towards its idling position on movement of said hand device in the same direction, and a choke valve structure for the carburetor, said actuating element operative on said choke valve when moving the throttle valve towards its idling position as aforesaid to move the choke valve towards its closed position.

20. In a carburetor provided with a throttle valve, means operatively connected with the valve for adjusting the latter whereby to control engine power output, a choke valve for said carburetor, and other valve operating means actuated independently of said first valve operating means and including a hand device and associated connections operable in one direction to first open said throttle valve prior to any closing movement of the choke valve and subsequently to move said choke valve toward its closed position.

21. In a carburetor provided with a throttle valve, means positively connected to the valve for operating the latter, a choke valve for said carburetor, and valve operating means including a hand device and associated connections carburetor, and valve operating means including a hand device and associated connections operable in one direction to first open said throttle valve from its idling position and subsequently efiect a simultaneous closing movement of said throttle and choke valves.

HAROLD H. TIMIAN.

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