US692893A - Governing device for engines, & c. - Google Patents

Description

No. 692,893. Patented Feb. u, |902.A & H.YMGLAREN;

(Application filed Feb. 16,l 190i.)

(NoKMpdel.) y 4She'ets-Sheet 2. I

No. 692,893. Patented. Feb. 1902.

J. &. H. MGLAREN.

GUVEBNING DEVICE FOR ENGINES, &c.

(Application lsd Feb. 18, 1901.)

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No. 692,893. 5 Patented Feb'. II, 1902.

VERNING DEVICE FOR ENGINES, &c. (Application'leQ lieb. 16., 1901.)

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UNITED STATES PATENT OFFICE.

JOHN MCLAREN AND HENRY MCLAREN, OF LEEDS, ENGLAND.

GOVERNING DEVICE FOR ENGINES, 80C.

SPECIFICATION forming part of Letters Patent N o. 692,893, dated February 11, 1902. Application led February 16, 1901. Serial No. 47,607. (No model.)

To all whom, t may concern.'

Be it known that we, JOHN MCLAREN and HENRY MCLAREN, subjects of the King of Great Britain and Ireland, residing at Midland Engine Works, Leeds, in the county of York, England, have invented certain new and useful` Improvements in Governing Devices for Engines Operated by Steam or other Fluid Pressure; and we do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which i-t appertains to make and use the same.

This invention has for its object to provide governing devices for engines operated by steam or other iiuid pressure in which both the centrifugal force and inertia of the revolving parts are utilized.

The valves for regulating the admission of steam or other fluid pressure to the lengine are operated by eccentrics. rlhe eccentric which works the valves is pivoted as near to the center of rotation as practicable and has a counterweight, constituting a pendulum, formed or fixed thereon, which acts on the opposite side of the pivot in such a way as to balance the weight of the eccentric itself with its straps and rods and which also acts as an inertia-weight to absorb shocks on the eccentric caused by the working of the valve. It also acts as a momentum or inerted weight, or both momentum and inerted weight, to accelerate the movement of the eccentric in either direction in the event of the load on the engine being suddenly thrown on or off,

thus acting in conjunction with the governor- Weights to maintain uniform speed under varying conditions of load.

Figure l of theaccompanying drawings represents in elevation one side of a governing device constructed according to this invention. Fig. 2 is a transverse section of the same on the line 2 2, Fig. l. Fig. 3 is an elevation of the opposite side of the governing device to that shown in Fig. l, and Fig. 4 is a section on the line 4 4, Fig. 3. Fig. 5 is a sectional view of part of the device drawn to a larger scale, and Figs. 6 and 7 are elevations at right angles to each other of the counterweighted eccentric drawn to a larger scale.

The eccentric A has a stem or pivot-pin A' and a weight or pendulum B formed integral .therewith or fixed thereto. The stem or pivotpin A turns in an eccentric sleeve orbush C',

' mounted in a bearing in the boss of a disk or drum D, which carries the speed-regulating mechanism, the said bearing being as near as practicable to the axis of the disk or drum. The sleeve or bush C has on one end, which projects outside one face of the drum, a serrated or toothed flange C' with which a locking-plate E is caused to engage to prevent the sleeve or bush from turning in the drum. By turning the sleeve or bush C in its bearing the position of the pivot A' with relation to the axis of the drum D can be varied as may be required for purposes of adjustment. The said sleeve or bush is retained in its adjusted position by engaging the locking-plate E with the teeth or serrations in the iiange O', While the stem or pivotpin A and the sleeve or bush are secured on the boss of the drum by a clasp F. On the disk or drum D,atdiametricallyopposite sides of the axis thereof, are studs I I', on which are mounted governorweights G G', each weight being connected by rods 'J J to the eccentric A atjj, the said weights being also connected atj2 to springs H H', connected at their out-er ends to tension-regulating devices hereinafter described. In the drawings twin springs H H are shown connected to each weight G G'; but one only or more than two springs may be used for each Weight. Coaxial with the motor-shaft M is a stud L, projecting from a plate L', secured to the boss of the disk or drum D. Mounted loosely on this stud is a bevel-wheel N, with which gear corresponding wheelsO O', fixed on the inner ends of two spindles or shafts P P, arranged radially on the disk or drum D and mounted in bearings Q and R on the said disk or drum, the bearings Q being on a cylindrical bracket on the dru m D, which bracket serves as a casing to cover the gearing O O N N. Mounted loosely onythe stud L and coupled, as shown, at W to the bevel-wheel N, is a friction-wheel K, on the boss of which is mounted another friction-wheel K, having formed integral therewith a bevel-Wheel N of the same size and having the same number of teeth as the Wheel N, the said wheel N also gearing with the wheels O O. Fast on the outer ends of the radial shaft or spindles P P are bevel-wheels S S',

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engaging, respectively, with corresponding WheelsX X on the ends of shafts T T. The shafts T T' carry WormsU, gearing with Worm- Wheel nuts V, fitting screw-threads on rods Y, to which the springs l-I H are attached, so that by turning the Worm-Wheel nuts V on the screwed rods Y the tension of the springs -H Il' can be increased or reduced, according to the direction in which the Worm-wheels V are turned. The rods Y are cach screwed into a cross-head to which the springs are connected, and to permit of the springs bellying orcurving outward by the centrifugal force the boss of each of the Worm-Wheel nuts V is made spherical and fits in a'corresponding socket in a lug projecting from the disk or drum.

When the engine is at work, the throw of the eccentric A in one direction is varied by the centrifugal action of the Weights G G and inthe other direction by the resistance or recoil of the springs H H. The Weight or pendulum B is so hung that when the eccentric is at its minimum throw the centerof-gravity line of the said pendulum is radial to the axis of the drum D; but as the throw of the eccentric increases the centerof-gravity line of the pendulum assumes an angular position, as shown by dot-and-pick line in Fig. l, the angle increasing with the increasing throw ofthe eccentric. The Weight or pendulum thus has a controlling influence on the eccentric in addition to that exercised by the weights G G and springs H H', inasmuch that When it is revolving around the engine-shaft the centrifugal force thereof tends to bring-'the center-of-gravity line of the Weight into a radial position to the axis of the drum and so serves to assist the Weights G Gr' to maintain auniform rate of speed under varying conditions of load on the engine. The speed of the engine can be altered While running by applying retarding force to the periphery of one or other of the friction- Wheels K K", whereby rotary motion will be given through the gearing N O O S S' and X X or through N O O S S and X X tothe Worms U in one or other direction, according to which of the disks or Wheels K K is retarded, and thereby increase or diminish, as the case may be, the tension of the springs H H', and thus cause a greater or less effect of the Weights G G on the eccentric A, and consequently on the valves by which the fluidpressure is admitted to the engine.

Having now'particularly described and ascertained the nature of this invention and in what manner the same is to be performed, We declare that what We claim is- 1. A device forvarying the tension of governor-Weight springs in steam-engines While the engine is running, comprising a drum, Weights pivoted thereto, a threaded rod, springs secured to the weights at one end, and to the drum near theperiphery at the other end through the threaded rod, a Worm-Wheel nut on the rod, and a worm engaging said worm-Wheel nut, and a shaft for the Worm carrying a gear at its outer end, a radiallyplaced shaft having gears at each end, one gear meshing with the gear on the Worm-wheel shaft and the other gear meshing with a centrally-arranged means for rotating said radially-placed shaft while the engine is running, and bearings for such shaft secured to the drum at either end, substantially as described. l

2. In a governing device for engines operated by steam or other fluid pressure, the combination with a disk or drum fast on the engine-shaft; governor-Weights pivot-ed to the disk or drum on diametrically opposite sid es of the axis thereof, a counterweighted eccentric pivoted to the drum and connected by rods to the governor-weights, and springs acting in conjunction with the said governor-Weights and with the counterweighted eccentric to maintain a uniform speed under varying conditions of load, of a stud or pin, carried by the disk or drum, coaxial with the engine-shaft, friction disks or Wheels, mounted loosely on the stud or pin, toothed Wheels carried by, or formed integral with the friction disks or Wheels; and gearing With similar wheels fast on radial shafts carried in bearings on the disk or drum, other toothed Wheels on the radial shafts in gear with corresponding Wheels on shafts carrying worms; screw-threaded rods connected to springs attached to the governor-Weights; a combined Worm-wheel and nut on each of the screw-threaded rods and gearing wit-h the Worms, so that by retarding one or other of the friction disks or Wheels the tension of the springs can be increased or diminished and thereby the speed of the engine be varied as desired substantially as hereinbefore described.

IOC

In testimony whereof We affix our signatwo Witnesses. J OHN MOLAREN. HENRY MCLAREN.

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