US 860913 A
Description (OCR text may contain errors)
No. 860,913. PATENTBD JULY 2s, 19o?.
OIL BRAKE FOR SPEED GOVERNORS.
v.uPLmATIoN FILED SEPT. 13. 1906.
//l /I ///////'y MAX ninn'iinLnrN, or Naw Yoan, N.
OIL-BRAKE FOR SFEED-GOVERNORS.
Speciioation of Letters Patent.
Patented July 23, 1907,
Application file@ :September 13, 1906. Serial No. 334,389.
To all whom it may concern:
Be it known that l, MAX HAEBERLEIN, a citizen oi the Empire of Germany, residing in N ew York, in the borough of Manhattan, county and State oi' New "fork, have invented certain ne v and useful Improvements in Oil- Brakes for Speed-Governors, oi which the following is a speoilication.
This invention relates to certain improvements in the oil-brake for speed-governors for which Letters Potent were granted to me on May 22, 1906, N o. 821,359, the improvements being designed with a view of rendering the operation of the oil-brake more reliable in the di rent positions of the piston-rod.
ln tbe oil-brake described in my prior patent, the
A piston-rod provided with longitudinal grooves which ter-urinate within the edges oi the bottoni of the piston and which, by a certain tension imparted to the pressure-springs, control accurately the time during which the piston returns into its median position. When with all motors 1whose velocity is controlled by a regulator with such an oil-brake the conditions which control. the stability oi regulation-ier instance, the ily-wheel capacity, tl, length of the pipe-connections andthe velocity oi, the water at the winter-wheels, were the saaie, then, with definite .torni of grooves and with a determined '1 d of time for the return of the piston into media positior. could be obtained the best and most 'favorable regulation, inasmuch, however', as in all motor-plants, and more especially in turbineplants, the ily-wheel capacity, length of pipeconduits und, velocity oi water, are changeable within considerable limits, it would be ne( :sary to obtain for cach plant tho p ier iorin of the lonlgitudinal grooves with ch the p .-rod to be provided, so that by d front openings for the oil and different periods of time which co' :spend lo the special conditions, the retu of .2 piston into its median position may be ol nit as is ixnpossibic to determine in every spec i for a good regulation the time required lor the p #on to returnl to its median position, and as the ruft-ur determination ol tho shape oi the grooves would talee up considerable time, it is useless to use one and they saine shape for the grooves io: all oil-brakes of this kind as thereby the proper change in the supply-openings for the oil eouid not be obtained in the proper manner.
The object oi this invention is to obviatc tho objecrini, by nio; ol a very simple dotionsy stated and nf.
vh i, th v)roher changeability or tho supply-oiinnings o ne oil-brake; and [or this purpose the invention conhorizontal section on line 2, 2, Fig. l, and lfigs. 3, 4,6,- (S and? are details showing the different positions of the parts.
Similar letters of reference indicate corresponding parts in the several iigures.
Referring to the drawings, a represents tho cylinder of my improved oil-brake and d the piston-rod, which is connected at its upper end with the lover of the speed-governor (not shown). The brake-cylinder a is open at the upper ond, its lower closed end boing provided with an eye a by which it is pivotally oonnected to a suitable standard. In thc brake-cylinder a is fitted a piston e, through the bottoni ol which the piston-rod d is passed, the piston-rod being accurately fitted into the central opening in said bottoni. At' each side of the bottoni of the piston e is arranged a between the inner and outer surfaces of tho bottoni by screw-nuts g, g that are hold by jam-nuts gl on the threaded portions of the piston-rod d, the tension of said springs being so adjusted by the scrcw-nuts g that they have always a tendency to iorco the piston e into a median position with respect to the piston-rod d. The springsf possess sullcient stiffness so as to impart to the' governor the required degree of stability. lu the median position of the piston e the pressure oi tho springs on the piston-rod d is neutralized; but with every shifting oi' piston and piston-rod towards cach other, they exert a resistance on the piston, which is gradually increased from zero upwards.
In the pistoni-od aro arranged two longitudinal grooves Il and t' which aro separated from each other by means of a narrow bridge o. In tho bottom of the piston are arranged also two grooves h and t", between which a narow bridge el ol the saine size as bridge 'o is orniod. ln tho niodian position ol' the piston the two bridges o, 'r1 are opposite to each other. and prevent the flow of oil from the oil-chamber in the lower part oi' tho cylinder a to the oil-chamber formed in tho upper parl ol' the piston. i When tho piston is shifted' for somo distance in one or tho opposite direction a connecting opening or charmel corresponding in sine to the extent oi the shifting motion is formed between tho two oilspaces referred to, so that tho play ol the piston takes place in the manner shown in my prior patent, No. 821,359. When, however', as shown in Figs. Il and 4, the piston-todd is turned on'ils axis for an anglo ol' lSO" it is obvious that as long as tho bridge 't inoves along tho central opening or bore in thtI bottom oi the piston no opening or channel. between the tyvo oil-spaces is obtained. The piston canthcreforo not be returned, after a shifting ol the piston-rod, into its median position, or, at least, only with such diminished velocity and piston-rod. the piston-rod is turned only for a small angle, so that pressure-spring f, the springs being held in position as the oil can gradually leak through between piston When, however, as shown in llig. 5,
the Width of the connecting-opening or channel is reduced from w to w1, it is obvious that the oil-passages 1 are reduced in the proportion of and that the time required for the return of the pistoninto its median position is enlarged in the proportion of uq-. It is therefore possible by a corresponding turning 'oi the piston-rod to regulate the passage of the oil so as to permit different quantities of oil to pass, and consequently also to alter thereby the time in which the piston is returned to. its median position. This turning of the piston-rod on its axis is accomplished by a hand-wheelv 1. An oil-brake for speed-governors for motors, whieh vonsists of a brake-cylinder, :i piston in said c vlinder,`:1
piston-rod adapted to be connecter1 with the governor and guided in the bottomof the piston, said piston-rod being provided with a pair of longitudinal grooves and a narrow means for turning the piston-rod so as to bring the grooves' therein at different angles to the grooves on the pistonbottom.
2. i\n oi1brake for speed-governors for motors, which consists of n brakecylinder, a piston in said cylinder', n piston-rod adapted to be connected with the governor and guided in a central opening in said piston-bottom, said piston-rod being provided with a pair of longitudinal grooves and a narrow brid between said'igrooves, the bottom of the piston beingvnlso provided with grooves and a narrow bridge between said grooves, pressure-springs at opposite sides of the bottom of the piston, and means for turning the piston-rod on its axis so as to shift the position of the grooves on the piston-rod relntlvely to the grooves in .the bottom of the piston.
In testimony, that I elaimtbe foregoing as my invention, l have signed my name in presence of'two subscribing witnesses.
Witnesses PAUL Gonrnh. HENRY yJ. Summum.