US984361A - Starting device for compound engines. - Google Patents

Description

L. DOILLET & P. R. FAURE.

STARTING DEVICE FOR GOMPOUND ENGINES.

Patented Feb. 14, 191 1.

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L. DOILLT & P. R. FAURE.

STARTING DEVICE FOR OOMPOUND ENGINES. APPLICATION FILED sBPT.1a, 1909.

984,361 Patented Feb. 14, 1911 3 SHEETS-SHEET 2.

L. DOILLET &.P. R. FAURE.

STARTING DEVICE POR COMPOUND ENGINES.

APPLIOA'IION FILED SBPT.16, 1909.

Patented Feb. 144, 1 91 1.

3 SHEETS-SHEET 3.

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LOUIS DOILLET ANI) PAUL ROBERT FAURE, OF PARIS, FRANCE.

STARTING DEVICE FOR COMPOUND ENGINES.

lSpecification of Letters Patent.

Patented Feb. 111, 1911.

Application filed September' 16, 1909. Serial No. 518,066.

To all whom it may concern:

Be it known that we, Louis Doinnn'r and PAUL Ronnn'r FAURE, citizens of the French Republic, residing at Faris, Department of the Seine, in France, have invented certain new and useful Improvements in Starting Devices for Compound Engines, ot' which the followingis a specilication. f

This invention relates to improvements 1n starting devices ttor compound elastic lluid engines and its primary object is to provide an arrangement which not only controls the normal circulation of fluid during running but as well provides for the simultaneous admission oit fluid to both the high and low pressure cylinders at the start of the operation of the engine.

A further object of the invention is to provide for the operative combination of the starting arrangement aforesaid with the valve controlling mechanism.

The invention is illustrated in the accompanying drawings, wherein- Figure 1 is a side elevation, partly in section, showing the application of the invention to a compound engine; Fig. 2 is a plan View; Fig. 3 is a section on the line A-A ot Fig. 1; Figs. l and 5 are sections on the line B-l3 of Fig. 2, showing the controlling valves oit the starting mechanism, Fig. 4t showing the positions of these valves during normal running and Fig. 5 showing their positions tor starting.

Similar characters of reference designate corresponding parts throughout the several views.

The compound engine shown embodies the high pressure cylinder 1, the low pressure cylinder 2, and the crank shaitt 3 which has its arms at an angle ot 900. The operation o1 the engine is controlled by admission valves 5 and exhaust valves G which in the tnnbodiment shown are provided at opposite sides of the engine and are operated by cams (not shown). rlhe cam means tor operating the valves is of known construction and per .se forms no part of the invention for which reason it is not disclosed and will only be referred to in a general way. The cams are mounted on shafts 5 and (3 respectively and have an increasing profile whereby when the cams are shilfted longitudinall)Y on the shafts the duration of the admission and exhaust may be varied as desired. For shitting the cams a lever 9 is employed, the connections between this lever and the cam sleeves comin'ising a link 10 and a forked member 11. The shafts 5 and (5 are provided with gear wheels 7 and 8 which mesh with and are driven by a gear whccl l provided on the crank shaft 3. Obviously by displacing either of the gear wheels 7 or 8 with respect to the other thc relative timing of the admission and exhaust may be regulated as desired.

The starting apparatus consists of a valve box which incloses three valves 12, 13 and 14T. The stems of these valves rest on cams 15 lwhich are provided on a rock shaft that is connected by an arm and a link 1G to the lever 9 aforesaid. The cams 15 are so set that the valve 13 is held open while the valves 12 and 14: arc closed (Fig. l1A), or vice versa (Fig.

The circulation connections are as follows: A pipe 17 leads from the boiler and is provided with two branches 1S and 1S), the branch 18 opening into the inlet valve chest ot the high pressure cylinder 1 and the branch 19 opening into the valve box of the starting device above the valve 12. Said valve box is connected by a pipe 2O with the inlet valve chest ol the low pressure cylinder 2, the pipe 20 leading 'from a point iminediately below the valve 12. The exhaust valve chest of the high pressure cylinder .is connected by a pipe 21 with the valve box of the starting device, the pipe 21 opening into said valve box immediately above the valve 111-, while the exhaust pipe oit the low pressure cylinder is connected to the valve box by a pipe 22 which commimicates immediately below the valve 141. l

lVith the lever 9 in the full line position 23 (starting backward) or .in the dotted 1' line position 211 (starting forward) the valve 13 is held against its seat and the valves 12 and 1-1 al'c held open. The fluid under pressure from the boiler passes into the inlet valve chest of the high pressure cylinder through the branch 18 and also at the same time into the inlet valve chest ot' the low pressure cylinder through the branch 19 and connection 20. The exhaust from the high pressure cylinder is through the connections 21 and 22 while the exhaust from the low pressure cylinder is direct.

It will be apparent from the foregoing description that it is possible to start the engine with a greater amount of power, than could be secured il the starting were made with a circulation of fluid as in compound running. Furthermore, since the crank arms are at right angles, at least one of the pistons will be off dead center at starting, for which reason the position of the cranks at starting is immaterial. n any portion of the lever 9 between the positions 23 and 24, the valve 13 is held open while the valves l2 and let are closed, in which case the exhaust from the high pressure cylinder passes through the pipe 2l above the valve 14 through the valve 18, and through the pipe 20 to the inlet valve chest of the low pressurecylinder.

Having fully described our invention, we claim:

l. The combination with high and low pressure cylinders and their admission and exhaust valves, of a starting device structurally independent of said admission and exhaust valves comprising a valve box, three valves arranged therein, valve operating means operable to hold the central valve open while the others are closed or vice versa, a fluid conducting pipe having a branch leading to the high pressure cylinder inlet chest and a branch leading to the valve box above one of the end valves thereof, a connection leading from below said end valve to the low pressure cylinder inlet chest, a connection from the high pressure cylinder exhaust chest and the valve box above the other end valve thereof, and a connection between the valve box, leading from below said last named valve to the exhaust of the low pressure cylinder, the central valve controlling the communication of the end valve chambers.

2. rEhe combination with high and low pressure cylinders connected together for compound ruiming, their admission and exhaust valves, and means for operating the latter to control the duration oi' the admission and vthe exhaust7 the means including a hand operated actuating element, of a starting device structurally independent of said admission and exhaust valves and comprising a valve box forming an element of the iluid circulation connections between the cylinders and relatively movable valves in said box, the valves and their seats having such arrangement that the valves may by one relative positioning cause the flow of fluid directly and simultaneously into the inlet chests of the cylinders, or, by another relative positioning, through the high pressure cylinder and its exhaust to the low pressure cylinder, and means connected to the said actuating element whereby the valves may be operated in either of the positions aforesaid.

ln testimony whereof we have hereunto set our hands in presence or" two subscribing witnesses.

LOUIS DOLLET. PAUL ROBERT FAURE. litnesses H. C. Coxn, GEORGES BOUJE.

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