US402923A

US402923A - Valve-gear

Info

Publication number: US402923A
Authority: US
Publication date: 1889-05-07
Anticipated expiration: 1906-05-07

Description

(No Model.) 3 Sheets-Sheet 1.

J. T. HALSEY.

VALVE GEAR.

N0. 402,923. Patented May 7, 1889.

"INVENTOR:

WITNESSES I N PETERS. Phulvulhngnpher, Wnmnhon. ole

(No Model.) 3 Sheets-Sheet 2.

- J. T. HALSEY.

VALVE GEAR.

No. 402,923. Patented May 7, 1889.

\LNVENTOR:

N4 PETERS, PhuQoJ-flhvgr lpher. Washington, 0.0.

(No Model.) 3 Sheets-Sheet 3'.

' J. T. HALSEY.

VALVE GEAR.

No. 402,923. Patented May 7, 1889.

INVENTOR:

0, m mmm N4 PETERS. PholoLilhognpher. Waihmgtnn. n. c

. UNITED STATES PATENT OFFICE.

JAMES HALSEY, OF FATERSON, NEW JERSEY.

VALVE-G EAR.

SPECIFICATION forming part of Letters Patent No. 402,923, dated May '7, 1889.

Application filed June 15, 1888. Serial No. 277,281. (No model.)

To all whom it may concern.-

Be it known that 1, JAMES T. HALsEY, a citizen of the United States, and a resident of Paterson, in the county of Passaic and State of New Jersey, have invented certain Improvements in Valve-Gear for Steam and other Engines, of which the following is a specification.

My invention relates to that class of valvegear wherein an eccentric is employed for actuating the valve of the engine; and my object is, in part, to provide a novel mode of operating both the main and cut-off valves of an engine by means of one eccentric, and, in part, to provide a shifting eccentric controlled by the governor for varyingthe lead, cut-0E, and compression, said shifting eccentric being employed to give the proper motion to the valve or valves.

My invention will be fully described hereinafter, and its novel features carefully defined in the claims.

In the drawings which serve to illustrate my invention, Figure 1 is a side elevation of an engine provided with my improved valvegear. Fig. 2 is a side elevation of the shifting eccentric detached. Fig. 3 is a side elevation of one form of the eccentric yoke or strap and its attachments for actuating the valve-rods. The eccentric is seen in section in this view. Fig. 3 is a sectional View on line 3 3 in Fig. 3. Fig. 4 is a plan view of the eccentric, its strap, and adjacent parts, the fly-wheel rim being broken away to show the parts within it. Figs. 5, 6, 7, 8, and 9 illustrate other modes of connecting the valverods to the strap of the eccentric for obtaining the proper relative motions of the main and cut-off valves. In Fig. 1 I have broken away a part of the walls of the valve-chamber and the main valve in order to show the cutoff valve.

A is the bedplate of the engine; 13, the engine-cylinder; O, the main or crank shaft, and D the fiy-wheel on shaft 0. These parts may be of the ordinary construction.

I have shown a governor carried by the flywheel. This governor comprises two like weights, a a attached, respectively, to arms b b hung at 0 a to opposite arms of the flywheel D. Rotation of the wheel tends to throw out these weights by centrifugal force, and

plate, G, (seen best in Fig. 2,) which is piV- oted at 00 to one of the fly-wheel arms and adapted to swing on said pivot m as a center of oscillation. WVhen plate G is thus swung, it changes the relative positions of the center of the eccentric with the main shaft, and thus varies the throw and the point at which the valves open and close the ports.

The carrier plate is shifted by the governor through the following-described means: In the said plate G is a slot, g, on the side of the main shaft opposite to the pivot-point m, and in this slot plays a slide-block, g, which has a hole to receive a pin or stud, g on one of the governor-weights a. The axis of the slot 9 is oblique to the path traversed by stud g when the weight a moves, and consequently any movement of said weight radially to the fly-wheel will swing the carrier-plate, and with it the eccentric, and vary the lead of the latter. The plate G is guided in its movement, and is kept up snugly to the face of the fly-wheel by means of bolts h in lugst' on the fly-wheel boss, said bolts engaging slots j in the plate G.

H is the eccentric yoke or strap. (Seen in elevation in Fig. 3.) In this yoke is fixed a laterally-projecting stud or wrist-pin, k, which has a bearing in a slide, Z, that plays in a guide, m, bolted to the side of the bed-plate. Above the pin is another pin, a, in the yoke of a similar character to pin is, and to this pin n is coupled the rod 0 of the cut-off valve I, said rod being coupled to the stem 0 of the said cut-off valve. To the slide 1 is secured the rod p of the main valve J, said rod being secured rigidly to the tubular stem 19' of said main valve. In the construction shown in the principal figures the stem of the cut-0E valve I plays through the tubular stem of the main valve 1; but this is not essential to nor does it form a part of my present invention. The main slide-valve and its cut-off valve may be constructed, in any well-known way, and not necessarily as herein illustrated.

Both valves are actuated by the same eccentric and yoke, themain valve being moved to and fro a distance substantially equal to the throw of the eccentric. The cut-off valve is moved to and fro by the rocking motion of the yoke on the pivotal point 71:. As the point n, Fig. 3, rocks or oscillates about the point as a center, it will be seen that when the eccentric revolves the cut-off valve will be carried to and fro with the main valve, and at the same time it will have imparted to it an independent movement on said main valve, thus effecting the cut-off in the usual way. 3y arranging the axis of the guide or slide way in. to pass, if prolonged, to one side of shaft C, (below as arranged in Fig. 1,) I am enabled to bring the main valve substantially to a state of rest at the end of its stroke and to maintain it at rest for a considerable time at this point.

In Figs. 5, 6, and 7 I have shown other modes of coupling the valve-rods to the yoke of the eccentric. In Fig. 5 the coupling is made direct, as in Fig. 3, but the rods p and 0 are con nected, respectively, to lugs s and t on the eccentric-yoke on opposite sides of the pivotal point of the yoke. In a slot, q, in the yoke is fitted a block, '7', which turns on a stud, r, in the bed-plate of the engine or in some other fixed part. The yoke plays on the block 4" in its movement to and fro. In Fig. 6 the stud or pin a is in a downwardly-projecting arm, and the rod 0 is connected to the stem 0 through the medium of a rock-1ever, u, fulcrumed on a block or collar on the rod 1). In Fig. 7 the eccentric-yoke is coupled to the rod 13 of the main valve in substantially the same manner as seen in Fig. 3, and the yoke imparts its motion to the stem 0 of the cut-off valve through the medium of a link, '17, which connects the yoke with one arm of an elbow-lever, n, the other arm of which is coupled to a rocklever, 11, by the rod 0. By properly proportioning the arms of the several. intermediate levers almost any desired extent of and kind of motion maybe imparted to the cut-off valve by the yoke of the eccentric, and this intervention of levers-sueh as r and u--forms an important part of my invention.

Fig. 8 is a side view similarto Figs. 5, 6, and 7, illustrating another form of my valve-gear, wherein a roekarm, Z, is substituted for the slide Z and its guide in order to get a movement in a substantially straight line. This arm and the slide Z are only two equivalent forms of carriers for coupling of the yoke to the valve rod.

Fig. 9 is a sectional front view of this device, the plane of the section being indicated by line 0 9 in Fig. 8. The rock-arm Z is coupled to the yoke at 7x, and to its upper vibrating end is coupled the upper end of a rock-lever, u, mounted on the yoke. The

lower end of this lever '21, is coupled to the stem 0' of the cutoff valve. The main valvestcm p is actuated through a rod, 1), connected to the rock-arm Z. This construction has special advantages, as it enables me to extend the arm of the eccentric-yoke out far enough to clear the fly-wheel and other parts of the mechanism of the engine.

In Figs. 5, 6, 7, S, and 9 I have omitted all the accessory parts in order to avoid obscuring the parts it was desired to fully illustrate therein. These accessories may be the same as those seen in the otherfigures of the drawings.

The valves shown in Fig. 1 are embodied in another application of mine, and I have not deemed it necessary to fully illustrate them in the accompanying drawings.

The slot g in carrier-plate G" (see Fig. 2) may be formed integrally in the plate; but I prefer to form it as illustrated in the drawings, for convenience in dressing its faces and for repairing it when worn away.

The regulator F of the governor is a closed cylinder filled with oil or other liquid, in which loosely plays a piston on the prolongation of rod f which enters the cylinder through a stuffing-box. This device prevents the governor-weights from moving in or out too suddenly when actuated by antagonistic forces.

The block '1' (seen in Fig. and the block g on the stud in the governor-weight a are only contrivances of a well-known kind to provide a bearing-surface and prevent the wear of the pin. They are not essential to the working of the invention.

Having thus described my invention, I claim-- 1. A valve gear comprising a shifting eccentric loosely embracing and carried by the engineshaft, a governor connected with and cont-rolling the shifting movements of said eccentric, the yoke of said eccentric, and the rods of the main valve and cut-off valve of the engine, both coupled to and actuated by said yoke, whereby the movements of both of said valves are controlled simultaneously by the governor.

2. The combination, with a shaft driven. by an engine and a wheel thereon, of an eccentric loosely embracing said shaft, a carrierplate which bears said eccentric, said carrierplate being pivotally mounted on said wheel and provided with a slot, the governor-weight carried around by said shaft and provided.

said plate, the spring attached to said weight, the yoke of the eccentric, and the valve-rods coupled to said yoke, substantially as set forth.

4. In a valve-gear wherein the main and cut-off valves are both actuated by one eccentric and its yoke, the combination, with said eccentric and yoke and the valve-rods and valves, of a rock-lever arranged intermediate between one of said valves and the yoke of the eccentric which actuates said valve.

5. In a valve-gear, the combination, with an eccentric carried by the engine-shaft and its yoke, of a carrier to which said yoke is coupled, the main-valve rod coupled to said carrier, and the cut-off-valve rod coupled to said yoke, the axis of the path in which said coupling plays being arranged to pass, if prolonged, to one side of the axis of the shaft carrying the eccentric, substantially as and for the purposes set forth.

6. In a valve-gear, the combination, with an eccentric carried by the engine-shaft and its yoke, of the main-valve rod operated by said eccentric, the stem and rod of the cut-off valve, an d intermediate levers between the said yoke and the stem of the cut-off valve, substantially as set forth.

7. .In a Valve-gear, the combination, with an eccentric carried by the engine-shaft and its yoke, of a carrier coupled to the yoke, the main-valve rod coupled to said carrier, a rocklever fulcrumed on and carried by the mainvalve rod, the cutoff-valve stein coupled to one end of said rook-lever, and the cut-offvalve rod coupling the other end of said rocklever with the yoke of the eccentric, substantially as set forth.

8. In a valve-gcar,tl1c combination, with an eccentric carried by the engine-shaft and its yoke, of a carrier to which said yoke is coupled, the main-Valve rod coupled to said carrier, the vibrating elbow-lever, the link coupling one arm of said elbow-lever to the yoke, and

.the cut-off-valve rod coupled to the other arm elbow-lever, as '0', a link coupling one arm of said lever to the eccentric-yoke, and the rod 0, coupling the other arm of said elbow-lever with the other arm of the rock-lever a, substantially as set forth.

10. In a valve-gear wherein the main and cut-off valves are both driven from the same eccentric and its yoke, the combination, with said eccentric and yoke, of a rock-arm to which the said yoke is coupled, the main-valve rod coupled to said rock-arm, a rock-lever pivotally mounted on the yoke and coupled at its upper end to the upper end of said rock-arm, and the cut-off-valve stem coupled to the other end of said rock-lever, substantially as set forth.

In witness whereof I have hereunto signed my name in the presence of two subscribing witnesses.

JAMES T. HALSEY.

Witnesses:

Jos. A. BERGEN, HENRY E. SAMUELS.