US643871A - Valve-gear for engines. - Google Patents

Description

No. 643;87I.' Ptented Feb. 20, I900. M. F. GUTERMUTH. VALVE GEAR FOR ENGINES.

(Applicatioxi filed Mar. 8, 1899.)

(No M del.)

UNITED STATES A PATENT OFFICE.

MAX FRIEDRICH GUTERMUTH, OF DARMSTADT, GERMANY, ASSIGNOR OF ONE-FIFTH TO FELIX LINOKE, OF SAME PLACE.

VALVE-GEAR FOR ENGINES.

SPECIFICATION forming part of Letters Patent No. 6 13,871, dated February 20, 1900.

Application filed March 3, 1899. Serial No. 707,611. (No model.)

To all whom it may concern:

Be it known that I, MAX FRIEDRICH GUTER- MUTE, professor at the Grand Ducal Technical High School of Darmstadt, residing at Darmstadt, Grand Duchy of Hesse, Germany, have invented new and useful Improvements in Detent Valve Gear for Steam Engines, (for which I have applied for Letters Patent in Germany, G. 12,683 ,dated August 18, 1898,)

of which the following is a specification.

This invention relates to an improved construction of detent-valve gear for steam-engines operated by lift-valves, whereby such mechanism is rendered of very simple con- :5 struction and operation, while at the same time the falling parts thereof are rendered as light as possible in order that such mechanism may be rendered applicable with advantage to quick-running engines.

In the drawings, Figure 1 is a side View, partly in section, illustrating the preferred form of the improved apparatus. Figs. 2 and 3 are similar views of modifications. Fig. 4.- is a plan, and Fig. 5 a vertical longitudinal 2 5 section, of a lever.

The gear for working the lift-valves consists on the one hand of an eccentric or cam 1, whose rod 2 oscillates upon a fulcrum 3, so arranged either above or below the eccentric- 0 rod, that the free end 4 of the latter has a curvilinear motion imparted to it, suitable for effecting the raising of the inlet-valve gear. This curve can be of form shown at Fig. 1 of the accompanying drawings; but it is prefer- 3 5 able to give the curve such a form, as indicated at Fig. 2, that a gradual rising of the valve-gear will be effected thereby.

The lever h, that effects the rising of the valve-spindle 5 and its valve, (not shown,) acts upon the valve-spindle through an intermediate connecting-piece 6, as shown, in which it can be shifted longitudinally by means of the movable fulcrum-lever S. The eccentric-rod lifts the free end of the lever h, 5 thus raising the valve, the duration of the opening of the latter being dependent upon the position of the lever it relatively to the end of the eccentric-rod.

If the lever 71. be moved backward to such an extent that its extremity does not lie within the path of the said lifting curve, the

valve will not be opened at all, and conse* .quently the engine will run Without steam until lever 72, is moved back into said path, While by shifting the lever more or less forward the cut-off may be made to give a filling equal to seventy per cent. or more of the stroke.

The fulcrum-rod S is fixed in arm 10, which is secured to spindle 11, to which arm 12 is also secured, and the latter arm is controlled by the governor-rod 13 and a suitable governor, the latter not being shown. I

This improved detent-valve gear has the following essential advantages: It hasv only a small number of pivots and joints, the free falling parts are reduced to a minimum weight, the pressure between the contactsurfaces of the moving parts is only small, and consequently their wear is correspond 7o ingly reduced, and the motion is a quiet one, and there is no reaction upon the governor, which acts upon the fulcrum-lever S of the lever h. In order to avoid any detrimental action of the reversing of the engine upon the 7 5 valve-gear, the lever 71., Fig. 2, is made forked, as shown at h, Fig. at, and is made to bear only in the upward direction upon the valvespindle, so that in the event of the engine running backward the eccentric-rod in coming in contact with the lever h on its downward motion can carry it down with it. A spring acting on the lever 72, as shown, causes it to be brought back to its contact with the valve-spindle after such depression. 8 5

With the arrangement of the lever h, as at Fig. 1, a simple device may be combined for forcibly closing the admission -valve. For this purpose a two-armed lever h 71, Fig. 3, q is provided, whose arm h is raised by the end 0 of the eccentric-rod on its return motion, thereby causing the arm k to press downward upon the end of the lever h, and thus to forcibly lower the valve-spindle and close the valve if from any cause it should stick 5 in the open position.

Now what I claim, anddesire to secure by Letters Patent, is the following:

1. In a detent-valve gear for steam-engin es and the like the combination with the verti- 10o cal valve-spindle,of a lever slidably connected with said spindle at a point intermediate the ends of the lever, a pivoted eccentric-rod 2 adapted to operate said lever and acting on an end of the lever projecting on one side of the valve-spindle, a movable pivot for said lever on the opposite side of the spindle, and a governor-rod for moving the pivot of the lever.

2. In a detent-valve gear for steam-engines and the like the combination of the vertical valve-spindle with a lever slidably connected between its ends with the said spindle, a pivoted eccentric-rod adapted to operate said lever, and a movable fulcrum-lever journaled to the other end of the said lever and controlled by a regulator, substantially as described.

3. In a detent-valve gear for steam-engines MAX FRIED RICH GU'IERM U'lll.

Witnesses:

RICHARD GUENTHER, FRIEDRICH QUEHLY.

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