US1833908A - Controlling device for carburetors of internal combustion engines - Google Patents

Description

K. MAYBACH Dec. 1, 1931.

CONTROLLING DEVICE FOR CARBURETORS OF INTERNAL COMBUSTION ENGINES Filed March 12, 1930 2 Sheets- Sheet 1 fnwnfor:

K. MAYBACH 1,833,908

CONTROLLING DEVICE FOR CARBURETORS INTERNAL COMBUSTION ENGINES Filed March 12, 1930 2 Sheets-Shee 2 fn enior;

mm Dec. 1, 19::

PATENT- OFFICE my ASSIGNOB 1'0 lumena B M17176, FRIEDRICH} DIVIOI 1'03 WWO OI INTERNAL COI BUSTIOR miemm Application lle'd latch 12, 1930, Serial 30. 485,221, and in Germany Kat-ch 18, 1989.

My invention relates to controlling devices for internal combustion engines and has special reference to devices of this kind in which the control mechanism ofv the carburetor is influenced by means depending on the number of revolutions of the engine, especially in automobiles.

Generally such means comprise a centrifugal governor driven by the engine and working directly on the control mechanism of its carburetor or carburetors. My invention refers to a device in which the centrifugal governor does not directly influence the control mechanism but works on a valve or the like controlling a vacuum by means of which the influence on the carburetor is exerted. It will be understood best when having reference to the drawings which represent an exam le embodying my invention.

he figures are drawn in a diagrammatical manner because in this way the nature of my invention can be explained best. All of them represent the same example, only in difierent ositions of the'workingparts.

Fig. 1 s ows the parts of the device before the motor is started. In Fig. 2 the relative positions of the component parts of the device are. shown when the motor is running at normal speed; whereas Fig. 3 represents the positions with the motor running at higher S ec The motor is indicated at M and there is an auxiliary machine, for example a dynamo for lighting and or ignition driven by the motor in any usual way by gears or by means of a chain. To this latter machine a centrifugal governor is attached. Attaching the centrifugal governor to such an auxiliary machine having a free shaft end for example has the advantage that my device need not be provided for the motor from the beginning but can be attached later without difficulty to any motor for which my device may be desired.

The outcoming shaft of the machine is indicated at 1. By means of a bush 2 or the like arms 3 having weights 4 at their ends are connected to shaft 1. Other arms 5 connect to member 6 and on rotation tend to draw this member towards shaft 1 against the pressure of com ress'ion spring 7.

Mem er 6 is connected to a non-rotating shaft 8 belonging to a kind of slide valve or the like. There are discs or projections 31, 32 and 33 fixed to said shaft 8 adapted to slide within space 30 and to open or close the ends of pipe lines 10, 10', 11, 13 and 13'. Pipe lines 10 and 10 lead to the open air or some place within the motor in which the normal atmospheric pressure predominates, for exampleto the crank case or the like. Pipe line 11 leads to a place of reduced air pressure, for example to the gas intake 12 of the motor or to a vacuum accumulator which may be exhausted by a special vacuum pump for instance. Pipe line 13 is connected to one end of cylinder 14, whereas pipe line 13' is connected to the other end thereof. Piston 15 is adapted to be moved within cylinder 14 by means of the vacuum bein connected to one end or to the other end 0% cylinder 14, depending on the position of shaft 8 and its projections 31, 32 and 33. Piston rod 16 is adapted to push against onearm of crank lever 17 connected to shaft 18. The other arm of crank lever 17 is connected to piston rod 23 and piston 24 sliding within cylinder 21 against the pressure of compression spring 22. The upper end of cylinder 21 is shaped into a rod 21 which is connected to one end of crank lever 20, the other end being provided with a pedal This crank lever is journaled at 19.

There is a lever 25 rigidly connected to shaft 18 and to its end rod 26 is fastened.

The upper end of this rod is connected to one arm of crank lever 27 journaled at 28. The other arm of crank lever 27 b means of rod 29 is connected to lever 39 w ich is inifixed connection to throttle valve 40. The operation of the entire as follows:

Fig. 1 represents the positionbefore starting the motor. Pipe line 11 is in connection with line 13 and pipe line 10 is connected to line 13'. Consequently piston 15 is drawn to the right hand side and rod 16 is held from m'oving to the left.

Upon starting the motor by pushing down mechanism is pedal and bringing lever 20 into the'dotted position, lever 17 is moved into its dotted position also. Upon increase of speed governor 2, 3, 4, 5 begins to work and to shift shaft 8 towards the left hand side into the position represented in F ig. 2. This position may be called the middle position; because upon further increase in speed the position represented in Fig. 3 will be reached, where- 1 as a decrease of velocity causes the positionv pushing down pedal 20, but spring 22 is compressed within cylinder 21 thus allowing for shaft 18 to be turned. Rod 26. by this turning of shaft 18 is moved upward and by means of crank lever 27, rod 29 and lever 39 throttle 40 is closed. Consequently the speed of the motor is reduced; within a short time the mechanism comes again to the position represented in Fig. 1 and immediately to that of Fig. 2. Thus the motor tends to stick to a uniform velocity of revolutions as long as the pedal is held in its downward position. Of course, the centrifugal governor together with its slide valve may be attached to any shaft revolving constantly with the motor.

said piston and said control lever; a lever adapted to be operated by foot; and a. oneway resilient connection between said foot lever and said control lever.

KARL MAYBACH.

Instead of controlling the throttle in the I intake, the air or fuel feeding openings in the carburetor may be. controlled also.

I do not Want to be limited to the details described or shown in the drawings as many variations will occur to those skilled in the art.

What I claim is:

1. In a motor a device of the kind described comprising a centrifugal governor driven by said motor; a vacuum container; a valve operated by said governor; a cylinder and a piston therein; said valve being adapted alternately to connect the two sides of said cylinder with said vacuum container; and one-way connecting means for transmitting the movement of said piston to the lever controlling the fuel mixture entering said motor.

2. In a motor a device of the kind described comprising a centrifugal governor driven by said motor; a vacuum container; a valve operated by said governor; a cylinder and piston therein; said valve being adapted alternately to connect the two sides of said cylinder with said vacuum container; a lever for controlling the fuel mixture entering said motor; one-way connecting. means between

Images