US1353656A

US1353656A - Fluid-operated motor

Info

Publication number: US1353656A
Application number: US360939A
Authority: US
Inventors: Charles L Heisler
Original assignee: General Electric Co
Current assignee: General Electric Co
Priority date: 1920-02-24
Filing date: 1920-02-24
Publication date: 1920-09-21
Anticipated expiration: 1937-09-21

Description

C. L. HEISLER.

FLUID OPERATED MOTOR.

APPtlCATlON FILED FEB. 24. 1920.

Pawnted Sept. 21,1920.

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CHARLES L. HEISLEBI, 0F SCHENECTADY, NEW YORK, ASSIGNOR T0 GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

FLUID-OPERATED Moron.

Specification of Letters Patent.

Patented Sept. 21, 1920.

Application filed. February 24, 1920. Serial No 360,939.

To allwhomitmag concern."

Be it known that I, CHARLES L. HEISLER, a citizen of the United States, residing at Schenectady, in the county of Schenectady, State of New York, have invented certain new and useful Improvements in Fluid-Operated Motors, of which-the following is a specification.

The present invention relates to fluid operated motors such as used to operate the valve gear of engines, for example, elastic fluid turbines, for regulating the admission operated motor of this character.

of operating fluid to the engines, and the object of my invention is to provide an improved structure and arrangement in a fluid For a consideration of what I believe to be novel and my invention, attention is directed to the accompanying description and the claims appended thereto. t

In the drawing, the figure is a sectional view of a fluid actuated motor embodying my invention, only as much of the engine parts being indicated as is necessary for an understanding of the invention.

Referring to the drawing, 5 indicates the cylinder of the fluid operated motor, and 6 the piston to which is connected a stem 7 which operates the valve gear of the turbine or other engine for controlling the admission of elastic fluid thereto. In the present instance, stem 7 is provided at its outer end with a rack 8 which engages a pinion 9 on a shaft 10 from which shaft the admission valve or valves of a turbine or other engine are operated by means of cams or otherwise.

Valve gear arrangements of this character are well known and need no detailed deare passages connecting the pilot valve casing to cylinder 5 on opposite sides of pistori 6. The pilot valve stem 17 is connected at its outer end to a floating lever 18 which lever is connected by a rod 19 and bell crank lever 20 to a speed governor 21. Speed gover'nor 21 is the governor of an engine, the valve gear of which is operated by the fluid actuated motor illustrated, and is used to driven from the engine shaft.

control the speed of theengine as is well understood. Floating lever 18 is connected at one end to an arm 22 which projects from stem 7.- f

The arrangement so far described forms an ordinary and well known type of fluid actuated motor arrangement for regulating the valve gear of an engine by means of a speed governor, the connections including a follow-up device to prevent over-travel of the valve gear. The operation of such a fluid actuated motor is well understood and may be briefly described as follows:

In case of increase in speed, the balls of governor 21 will fly out, thereby moving pilot valve 12 toward the right and connecting inlet conduit 13 with passage 15 and exhaust conduit 14 with passage 16. As a result actuating fluid for the motor will be admitted to the left hand side of the iston 6 and exhausted from the right hand side causing it to move in a direction to close the Valve means which is actuated-by rack 8. In case of a decrease in speed of the engine,

the same action takes place, except in the ter, it is customary to utilize as motive fluid 4 for the fluid actuated motor, oil from the forced feed lubricating system for the engine, such oil being supplied by a pump However, the fluid actuated motor requires considerably more pressure for its operation than is required for lubricating purposes. As a result, it has been the custom ,to provide a pump which would maintain a pressure in the lubricating system sufficiently high for use in the fluid-actuated motor for the valve gear although such pressure was much higher than that actually required for lubrieating purposes. This has represented a considerable waste of energy since but comparatively little fluid isused in the fluidactuated motor. I

More particularly, the object of my invention is to overcome the above difliculty and to this end I provide an arrangement of apparatus whereby the fluid-actuated motor which is operated from the forced feed lubricating system may be operated with fluid of a very much lower pressure than heretofore, z'. 6., a pressure no higher than that actually required for the lubricating system, while at the same time, ample motive power is provided for operating the valve gear. Accordingly if provide in connection with the usual fluid-actuated motor which is connected to the lubricating s stem, a second fluid-actuated motor which term a booster motor and which is operated by high pressure elastic fluid such as is supplied to operate the engine or turbine. 'llhis booster motor is arranged in such manner that it will assist the regular hydraulic motor in operating the valve gear.

24 indicates a cylinder in which is a piston 25 provided with a stem 26 which is connected to piston 6, the two cylinders 5 and 2% being arranged in axial alinement. Connected to cylinder 24 is a smallercylinder 27 in which is a pilot valve 27A. The'admission conduit for pilot valve 2'? is indicated at 28 and the discharge conduit at, 29. The pilot valve casing 27 is connectedto cylinder 24 on the two sides of piston 25 by

passages

30 and 31. The stem 32 of pilot valve 27 is connected to a fluid actuated abutment 33 which is shown in the form of a piston which moves in the cylinder 34:. One side of abutment 33 is subjected to the pressure in cylinder 5 on one side of piston 6 through a passage 35, and the other side of the abutment is subjected to the pressure on the other side of the piston 6 through a passage 36' Abutment 33 is normally maintained in an intermediate position in cylinder 34 by means of springs 37 which at opposite ends engage spaced collars 38 loosely mounted on pilot valve stem 32, and normally held against shoulders 39 which are fixed on stem 32. The loose collars 38 are positioned by means of spaced stops 4:0 and 41.

Assume that the engine is operating and the various parts are in the positions shown in the drawing. If now speed governor 21 moves pilot valve 12 in one direction or the other, it will result in admitting fluid pressure to one side of piston 6 and permitting it to exhaust from the other side of piston 6 in the usual manner. As aresult the pressures on opposite sides of abutment 33 become unbalanced and consequently abutment 33 will be moved in one direction or the other, thereby moving pilot valve 27 to connect inlet conduit 28 to one side of piston 25 and discharge conduit 29 to the other side, the connections being such that piston 25 will move in a direction to assist the movement of piston 6. For example, assuming that pilot valve 12 is moved to connect inlet conduit 13 to passage 15, discharge conduit 14: to passage 16, then the pressure will be increased on the left hand side of piston 6 and decreased on the right hand sidethereof. As a result fluid actuated abutment 33 will be forced toward the left connecting inlet conduit 28 through passage 30 to the left hand side of piston 25 and discharge conduit 29 to the right hand side,

whereupon actuating fluid, as elastic fluid from the engine, will be admitted to the left hand end of cylinder 24 so that piston 25 will move toward the right and in a direction to assist the movement of piston 6. As soon as the pressures on opposite sides of piston 6 become balanced, then abutment 33 will be brought back to its intermediate position by springs 37. As is clear, when abutment 33 moves to the left, left hand collar 38 will be held from movement by the stop 4C0, while the right hand collar 38 will be forced toward the left by shoulder 39 to put spring 37 under compression, the stem 32 at such time sliding through left hand collar 38.

With the above described arrangement,

therefore, it will be seen that I utilize fluid of comparatively lovi pressure, such as would normally be supplied through the force feed lubricating system of an engine, in the main fluid actuated motor, while at the same time i am'enabled to obtain ample power for operating the valve gear by utilizing in series with the fluid-actuated motor, a booster motor which may be operated by high pressure fluid such as the elastic fluid used in the engine, for example, steam.

In accordance with the provisions of the patent statutes, l have described the principle of operation of my invention, together with the apparatus which ll now consider to represent the best embodiment thereof, but I desire to have it understood that the apparatus shown is only illustrative and that the invention may be carried out by other means.

What ll claim as new and desire to secure by Letters Patent of the United States, is

1. in an apparatus of the character described, the combination of a fluid actuated motor having a pilot valve, a second fluid actuated motor having its moving element connected to the moving element of the first-named motor, and means controlled by the fluid pressure of the first-named motor for admitting fluid pressure to the secondnamed motor.

2. In an apparatus of the character described, the combination of a fluid actuated motor having a pilot valve a second fluid actuated motor having its moving element connected to the moving element of the first-named motor, and valve means controlled by the pressure of the first-named motor for admitting fluid pressure to the second-named motor.

3. In combination, a fluid actuated motor comprising a cylinder, a piston therein, and a pilot valve for controlling the passage of actuating fluid to the cylinder, 2. second fluid actuated motor comprising a cylinder, a piston and a pilot valve for controlling the passage of actuating fluid to such cylinder,

fluid actuated motor comprising a cylinder,

a piston and a pilot valve for controlling the passage of actuating fluid to such cylinder, means connecting said two pistons together, a movable abutment, a cylinder in 15 which it moves, conduits connecting opposite ends of the last named cylinder to opposite ends of the cylinder of the first-named motor, a stem which connects said abutment to the pilot valve of the second-named 20 motor, and means for normally maintain ing said abutment in a central-position in its cylinder sothe pilot valve of the secondnamed motor is closed In Witness whereof, I have hereunto set 25 my hand this 20th day of February, 1920.

CHAR-LES L. HEISLER.