US746133A - Gas-engine. - Google Patents

Description

' No. 746,138. PATENTED DE0.8,1903.

L. H. NASH.

GAS ENGINE.

APPLIUATIOii FILED DBO. 28, 1896.

0 MODEL. I 6 SHEETS-SHEET 1.

CECE-D WITNESSES: INVENTOR no: Nonms PETERS co. Puma-Una, WASHINGTON. u c.

PATENTED DEC. a, 1903 L. H. NASH.

GAS ENGINE. APPLICATION IILBD mm. 2a, was.

6 SHEETS-33161 3.

N0 MODEL.

WITNESSES n15 NORRIS PETERS co, momuma, WASHINGTON, n. c.

No. 746,133. I PATENTED DEC. 8, 1903.

L. 'H. NASH.

GAS ENGINE.

APPLICATION FILED DEC. as, 1896. no MODEL. 6 $HEETS-SHEET 4.

WITNESSES:

:1!" NEYS v THE NORRIS versus coy. monmumu Jmsummon, n. c

0 E D D B T N E T A P T am 3 1 6 4 7 m N GAS ENGINE.

APPLICATION FILED DBO. as, 1896.

6 SHEETS-SHEE'I' 5.

0 MODEL.

./ 3 4 2 W 0 7 2 w 2 0 W9 r. v Q m 2 o oo 9 2 INVENTOR In 44 49 7 52 "@HGD 44 I v"?! \-4 WITNESSES! 2 I )7 lot and exhaust valves.

UNITED STAT S Patented December 8, 19 03.

PATENT QFFICE.

LEWIS HALLOCK NASH, OF SOUTH NORWALK, CONNECTICUT, ASSIGNOR TO THE NATIONAL METER COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK. 4

GAS-ENGINE, I

SPEGIFICATION forming' part of Letters Patent N 0. 74:6,133, dated December 8, 1903.

Application filed December 28,1896. Serial No. 617,236. (No modeld To all whom it may concern: 7

Be it known that I, LEWIS HALLOOK NASH, a citizen of the United States, andv a resident of South Norwalk,in the county of Fairfield' and State of Connecticut, haveinvented certain new and useful Improvements in Gas- Engines, of which the following is a specification.

My invention relates to gas-engines of the four-cycle type j and it consists of certain novel parts and'combinat-ions of parts particularly pointed out in the claims concluding this specification.

. The following is a description of the engine shown in the accompanying drawings, which engine embodies the several novel features of my invention in the forms which are at present preferred bymeybutit will be understood that various modifications and changes maybe made without departing from the spirit of my invention and without ex ceeding the scope of the concluding claims.

In the drawings, Figure 1 is an elevation of the engine; the engine from the line 2 2,- Fig. 1. isa section on the lines 3 3, Fig. 10. Fig. 4 is a section showing an exhaust-valve and its operating mechanism. Fig. 5 is a section showing the inlet-valve and its operating mechanism. Fig. 6 shows governor mechanism. Fig. 7. is arsection at right angles to the sections of Figs. 4 and 5, showing the in:

with Fig. 4, in the former the governor being in action and in the latter-the governor being out of action. Fig. 9 is a vertical section taken through one of the ball-joint bearings and its connections. Fig. 10 is a top view of the working cylinders, one of the cylinder-heads being removed. Fig. 11 is a section through the inlet and outlet ports.

Similar figures of reference indicate the same or corresponding parts in all the drawlugs.

The following is a description of the accompanying drawings.

Referringfto Fig. 1, 10 10 10 10 are four cylinders, which are supported on an intermediate frain'e' 11, carried on a base 12. 13 13 are fly-Wheels carried upon the main shaft Fig. 2 is a cross-section through Fig. 3

Fig. 8 corresponds l4, providedwith cranks 15 15. are connecting-rods or pitmen, each attached to its piston. 17 is the supply-pipe for air,'

and 18 is the supply-pipe for fuel, and19 is 7, 8, and 9.

Referring to Fig. '8, 23 is the outlet-valve. 24 isa coiled spring which keeps it normally seated. is a nut connecting two sections of the valve-stem to' p'ermitadj ustment as to length. 26 is a rocking arm pivoted to a rod 27 and provided with a compression-spring 30 is an antifriction-roller carried on the arm 26, bearing against the surface of the cam. 31 is a pivotal connection between the valve-stem 20 and the rocking arm 26. The'cam 29 is' carried on a shaft 32, which is actuated,as shown in Fig. 1, by the worm-gear 22. 33 is a rocking arm pivoted '[O' the frame, of the machine, having a projection 34 on its end adapted to engage .with a projection 35 on the rocking arm 26 when operatedby the governor. j

Referring to Fig. 9, 36 is the inlet-valve. 37 is a nut connecting the two parts of the valvestem 21 to permit adjustment as to length. 38 isa ball-bearing. 39 is agland to take up lost motion. 40 is a rocking arm pivoted to shaft 27. 41 is a roller carried by the rocking arm, bearing against the cam-surface 42, attached to shaft 32. 43 is a rocking arm provided with a roller 44, bearing upon cam 45, also attached to shaft 32. 46is a compression-spring for" normally keeping the roller 41 in contact with the cam 42. 48' is a h-it-or-miss projection carried by the rocking arm 40, engaging when in operation with a projection 46 on the valve-stem 21.

47isan" 7 28,'w hich normally throws the arm in the di- 1 "rection of the actuating-cam 29.

Referring to Fig. 6, 51 is an arm attached to a shaft 52, (see also Fig. 7,) which forms the pivot for the arms 33 and 43. This arm, as already described, is vibrated by cam 45, Fig. 9, whereby the arm 51 is vibrated in unison therewith. 53 is a clip hinged at 54, the end of which stands under the end of rod 51. 55 is a stop limiting the motion of the clip in one direction. This clip is provided with an arm 56, forming with the arm 53 a bell-crank lever. 57 is a link connecting arm 56 with an arm 58, which is a part of hellcrank lever 58 59, pivoted at 60. The arm 58 is formed of two parts, one sliding on the other, between which is a compression-spring 61, the parts forming a telescopic joint normally extended by the spring 61. In the position shown in Fig. 6 the action of the spring 61 is to keep the clip 53 pressed against the stop 55. As the rod 50 moves longitudinally downward (as viewed in the drawing) the upper end of bellcrank lever 58 moves forward until it passes the neutral point, when spring 61 extends its telescopic joint and reverses its action upon the clip, now tending to throw this clip in the position shown in Fig. 5, preventing the arm 51 from returning to its normal position-that is, the position it occupies in Fig. 6. Hence the link 57 fails to transmit any motion to the valve-operating mechanism until a certain point is reached, when the action is instantaneous.

Referring to Fig. 2, 62 is a beveled gear keyed to shaft 14. 63 63 are beveled gears operated thereby, attached to shafts 64 64, carrying at their upper ends worms 65 65, actuating worm-gears 22 22, keyed to shafts 32 32. One of the shafts 64 is provided with a beveled gear 66, coacting with gear 67, attached to rod 68, for operating a suitable governing mechanism-such, for example, as a ball-governor of the ordinary type.

Referring to Figs. 3 and 10, it will be seen that the several cylinders have an angular relation with reference to each other and are grouped together in other than right lines. The object of arranging the pistons and cylinders in this way is to permit opposite pistonsto connect withasinglecrank-pin. Asthe distance between the central lines of the cylinders is the distance between the centers of the connecting-rod boxes, the crank-pin need be of a length equal to the width of the two boxes, as shown in Fig. 1. When the cylinders are related in this way, the angular relation shown in Fig. 2 is necessary to enable the pistons both to work directly in the true line.

The operation of the device may be thus described: The valve mechanism, both for introducing 'and for exhausting the charge, is positively operated by power taken from the main shaft through the gears 62 63 65 22, actuating shaft 32, which carries the valve- operating cams 29, 42, and 45. Cam 45 oscillates rocking arm 43 and hit-or-miss mech- When projection 48 engages anism 46 48.

with projection 46 onthe valve-stem, the inlet-valve 36 is opened to admit a charge, and as the projection 48 recedes it is closed by its spring 75. In the normal operation of the device the arm 43 is oscillated backward and forward by cam 45 and by a spring (not shown) which keeps the roller 44. in contact with said cam in such a way that the projection 46 is always in the engaging position with the projection 48 at the time when the cam is ready to lift the' valve. In other words, normally the projection 48 always hits the projection 46 at each oscillation of the rocking arm 40. \lVhen the governor acts, however, to control the speed of the engine, this projection 43 misses the projection 46, and the valve 36 does not lift, The position of the parts when operating in normal condition is shown in Figs. 6 and 9, and in Fig. 5 the position of the parts is shown when controlled by the governor. The exhaustvalve is also positively acting and under the control of the governor. In this case the valve is caused to open and close at the proper time through the agency of the cam 29, which when theengineis in normal operation reciprocates the valve-stem 20. This is the condi tion of the parts as shown in Fig. 8. When, however, the governor acts, as already described, the projection 34 is raised, so as to come into an engaging position with projection 35, and the exhaust-valve 23 is then held open as long as the governor is controlling the output, as shown in Fig. 4.

An analysis of the mechanisms shown and described for operating and controlling the valve will show that they may be divided into three groups. The first group consists of the parts which act to open and close the valves, as the arms 26 and 40 and cams 29 and 42. These are power-driven and constantly in action. The second group consists of what may be called a make-and-break device, which is power-driven and constant in action, said device acting to connect and disconnect the valve-stems from their actuating devices at each cycle of their operation-that is, the connection is broken and made once for each normal period of operation of the valvesand consists of rocking frame 33 43 and cam 45. The third group consists of the mechanism actuated by the governor, consisting of the catch or stop 53 and the mechanism connecting the same with the governor. The mechanisms of the first and second group--that is, the valve-operating mechanisms and the make and break device-are both powerdriven, so that none of the labor of operating them is thrown upon the governor. The governor has to actuate only the catch or look by which the make-and-break device is restrained from movement in one direction, and may therefore be much smaller and weaker than Would be required if the makeand break device were actuated directly thereby, as well as be more sensitive and accurate.

In the foregoing specification'I have incidentally referred to some of the modifications which might be adopted in the practice of my invention; but I have not endeavored to specify all the modifications which might be employed, the object of this specification being to instruct persons skilled in the art to practice my invention in the form at present preferred by me' and to enable them to understand its nature, and I desire it to be distinctly understood that mention by me of a few modifications is in noway intended to exclude others not referred to, but which are within the spirit and scope of my invention.

Many of the details and combinations illustrated and above described are not essential to the several inventions broadly considered. All this will be indicated in the concluding claims, where the omission of an element or the omission of reference to the detail features of the elements mentioned is intended to be a formal declaration of the fact that the omitted elements or features are not essen-.

tial to the inventions therein severally covered.

What I claim is- 1. In a gas-engine the combination with admission and exhaust valves and means for operating them, of power-actuated means adapted to break the operating connectionsof said valves during each cycle of their operation and a stop controlled by the governor to engage the said operating means to hold it in inoperative positions.

2. In a gas-engine the combination with admission and exhaust valves and means for operating them, of a governor, a power-driven device containing a member adapted to engage the admission-valve-operating mechanism to prevent its action, and a stop thrown into action by the governor to hold said member into engagement with the exhaust-valveoperating mechanism to hold the valve open.

mechanism adapted to break the continuity of the valve-operating mechanisms during each cycle thereof, a governor and a stop or lock controlled by the governor to engage said auxiliary mechanism to hold it in position to retain the admission-valve'closed and the exhaust-valve open. 5. The combination in a gas-engine with admission and exhaust valves, and means for operating them, of power-driven means for suspending the action of the opening devices for one valve and the closing devices for the other valve, a governor, and means controlled by the governor for throwing said power-driven valve-controlling means into action.

6. The combination in a gas-engine with admission and exhaust valves and independent opening and closing devices for said valves, of a power-driven mechanism adapted to suspend the action of the opening device for one valve and aclosing device for the other valve,

a governor and means actuated thereby for controlling the action of the valve-controlling mechanisms.

LEWIS HALLOOK NASH.

Witnesses:

FRED S. KEMPER, M. WILSON.

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