US2450037A - Governor - Google Patents

Description

. Sept. 28; 1948.

R. R. DULONG common Filed Sept. 25, 1946 mmvron.

- ROGER R. DULONG ATTORNEY Patented Se t. 28, 1948 Roger R. Dulong, St. Louis, Mo.,

assignor to Carter Carburetor Corporation, St. Louis, Mo., a corporation of Missouri Application September 2a, 1946. Serial No. 898,779

7 Claims. (Cl. 137153) This invention relates to governors, particularly for internal combustion engines, in which the governing function is performed by a valve located in the fuel intake conduit. In a co-pende ing application, Serial No. 545,344, filed July 1'1, 1944, in the name of the present inventor, there is illustrated such a governor in which the governing valve is controlled by a diaphragm operated .by the difference of static pressure on opposite sides of the 'valve. Various means are provided therein for adjusting the torque applied to the valve in accordance with its position,- including a manually adjustable air bleed in the suction connection. It has been found, however, that although this device operates satisfactorily when adjusted for a certain locality, further adjustment must be made when the governor is used in a region at a different altitude. Specifically, at a higher altitude, the governcr is affected so as to permit the engine to operate faster than v of the engine.

the intended governed speed. This is because the difference of pressure for a given speed on opposite sides of the valve decreases as the altitude increases.

Accordingly, it is an object of the present invention to provide a governor of the above type including means to compensate for changes of altitude.

A more specific object is to provide for moderating and adjusting a governor control, specifically of the static suction type, so that the governed speed is maintained irrespective of altitude.

These objects and other more detailed objects hereafter appearing are attained by the device illustrated in the accompanying drawing in which 2 its other end to arm l2 so as "to constantly urge the governing valve open.

Chamber i is connected by a suction tube It to the intake conduit posterior to valve 3. Chamber 8 is connected byan air bleed tube l to this conduit anterior to valve 3 and the venturi tube. The diflerential pressures thus produced during operation of the engine act on the diaphragm and cooperate with spring ii to balance the governing valve 'so as to maintain the governed speed Tubes I 4 and I! are connected through a chamber I! having a valve seat ila controlled by a needle valve i 8. Adjacent chamber i1 there i provided a second pressure casing l9 having a piston working therein and constantly urged toward the left by a coiled spring 2 i This piston is connected by a link 22. to metering pin It which adjusts the effective size of the air bleed. Casing I! at the left side of piston 20 is connected by a tube 24 to cross passage l8. Cylinder It on the opposite side ofthe piston is connected by a tube 25 to suction connection it.

The extent of movement of the piston maybe adjusted by one or more screws threaded into the cylinder, as at 26, and spring 2| may be adjusted by screw 21.

In operation, diaphragm 8 responds to variations in the pressure differential in tubes l4 and II to actuate the throttle valve in opposition to spring IS. The system of pressures and forces acting on the throttle is such that this valve will be balanced to maintain the governed peed under the figure is a diagrammatic elevation illustratingan internal combustion engine intake conduit with a governing valve and control according to the present invention.

The drawing shows a section-l of an engine intake conduit including a venturi tube 2 into which a fuel nozzle (not shown) may open, and a butterfly throttle valve 3 mounted on shaft '4 posterior to the Venturi tube. The conduit is flanged at thelower end as at 5 for attachment to the usual engine intake manifold (not shown) Mounted-adjacent to the intake conduit is a control housing formed by a pair of cup-shaped members i and I clamped about the periphery of a flexible diaphragm I which divides the housina into diflerential pressure chamber t and ill. Diaphragm I is-connected by linkage II to an arm l2 rigidly secured to a throttle shaft 4. A tension spring it, anchored atone end, is connected at all load conditions. As in the above mentioned co-pending application, the positioning and shaping of lever I2 additionally aid in balancing the throttle. When the device is operated at higher altitudes, the atmospheric pressure acting on the right side of diaphragm 8 is reduced tending to further open the throttle and increase the governed speed. However, the consequent leftward movement of piston 20 and metering pin ll reduces the effective size of orifice Ila so as to increase the effectiveness of the suction in tube It acting on the left side of the diaphragm to close the throttle. All change in atmospheric pressure acting through tube I! are compensated in this manner by the automatic control of cross pas sage It.

Thus, the governor will operate uniformly regardless of altitude changes. 0! course, the governing control may incorporate other modifying or compensating features, such as shown 'in'the above mentioned coepending application, for instance, while retaining the advantages of the novel air bleed control above described. The

engine having an intake conduit, a governing valve in said conduit, a device responsive to pressures in said conduit for actuating said valve. means tending to moderate'the efl'ect of said device, and means independently responsive to the intake conduit pressures for adjusting said mod; crating means.

2, In a governor for an engine having an intake conduit, a governing valve, a device responsive to pressures in said conduit for actuating said valve, said device including an air bleed tor moderating the effect of said device, and means independently responsive to intake conduit pressures for adjusting said bleed.

3. In a governor for an engine having an intake conduit, a governing valve in the conduit, 8. device responsive to intake conduit pressures for actuating said valve, said device having an air bleed for moderating the eflect thereof, a metering valve associated with said bleed, and means independently responsive to intake conduit pressures for actuating saidmetering valve.

4. In a governor for an engine having an intake conduit, a governing valve in the conduit, a device responsive to static pressures produced in said conduit for actuating said valve, said device including an air bleed for aflecting the action thereof, a metering valve for adjusting said bleed,

and means responsive to intake conduit pressures for operating said metering valve.

5. In a governor for an engine having an intake conduit, a governing valve in said conduit, a device responsive to increases 01' suction in said conduit for closing said valve and responsive to decreases of suction therein for opening said valve, said device including a suction connection to said conduit and an air bleed in said connection, a metering control for said bleed, and a de- -vice independently responsive to intake conduit suctions for operatin said metering control.

6. In a governor for an engine havingan intake conduit, a governing valve in said conduit, means responsive to pressures in said conduit on opposite sides of said valve for controlling the same, said means including a suction chamber having a movable wail, connections to said conduit, and an air bleed in one of said connections, and a second suction operated device for controlling said air bleed.

7. In a governor for an engine having an intake conduit, a governing valve in said conduit, pressure chambers separated by a movable well connected to said valve for operating the same,

connections between said chambers and said conduit, respectively, anterior and posterior to said valve, a cross passage between said connections, an air bleed in said cross passage, a metering control for said bleed, and a device responsive to suction in said conduit posterior to said valve for adjustin said bleed control.

ROGER R. DULONG.

No references cited.

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