US577589A - Valve for explosive-engines - Google Patents

Description

(No Model.) l 42 Sheets-sheet 1.

E. L. TEUBERT. VALVE FR EXPLSIVEBNGINES.

Patented Feb. 23,1897'.

WZ JMSMQMO@ Witt/wacom I (No Model.) 2 Sheets-#Sheet 2,

E. LTEUBERT. VALVE FOREXPLOSIVE ENGINES. N0. 577,589. l Patented Feb. 23, 1897.

Si: v S Y Nrrnn STATES ATENT Ormes.

ERNEST LUDVIG TEUBERT, OF CASTLE, PENNSYLVANIA.

VALVE FOR EXPLOSIVE- ENGIN ES.

SPECIFICATION forming part of Letters Patent No. 577,589, dated February 23, 1897'.

Application filed March 16, 1896.v Serial No. 583,416. (No model.)

To @ZZ whom it may concern:

Be it known that I, ERNEST LUDWIG TEU- BERT, a citizen of the United States, residing at New Castle, county of Lawrence, and State of Pennsylvania, have invented certain new and useful Improvements in Valves, of which the following is a specification.

My invention relates to gas and gasolene engines; and it consists of the hereinafter-described construction of gear for operating the exhaust-valve of a gas -or gasolene engine.

In the accompanying drawings, Figure l is a top view, and Fig. 2 a front view, of myl improved gear for operating the exhaustvalve, showing alsoits connection to the valve and its arrangement on the engine. is a diagram of a modified construction of the valve-operating gear. Fig. 4t is a enlarged detail of the valve-head, and Fig. 5 is an elevation showing a sliding valve operated by my improved gear in the same manner as the puppet-valve shown in Fig. 2.

The necessarily quick and forcible motions of the exhaust-valve in gas and gasolene engines produce a hammering sound and cause also the valve and the valve-seat to be rapidly worn out, and as it is essential for the working of a gas or gasolene engine that the closing of the exhaust-valve should be not only timely, but also absolute, the wearing out of the exhaust-valve necessitates its replacing by another or bushing of the valve-seat. This, however, cannot be repeated very often. To

remedy this evil, concussion-springs and other devices were employed to reduce the force of the strike of the valve against its seat, and also slide valves were substituted for the more effective puppet-valves. It has been, however, found that the concussion-springs and similar means employed for thatpurpose hamper more or less the operation of the valve and that the sliding exhaust-valves are not as effective in the working of a gas or gasolene engine as a puppet-valve.

I have constructed for operating the exhaust-valve what I call a slotted cam-gear, and this, in combination with the adjustable sliding frame in the valve-head, produces a quick and absolute closing and opening of the exhaust exactly at the time required by the cycle of the engine and prevents absolutely the hammering strokes of the valve against Fig. 3

its seat. My improved valve-gear is, however, also effective in operating a non-adj ustable valve, and I shall therefore describe the adjusting contrivance independently.

The main parts of my improved gear are the cam a, oscillating on pivot b and operated by rod c from an eccentric set on the shaft of the engine, the lever d, bracket e, bolt f, and roller h. The valve is journaled in box n, set in a boss in cover p of chest E, wherein also pivot h is set. v

Lever d is connected through pin t' to sliding block q, sliding in the valve-head A, and is hinged to bracket e, cast in one piece with cover jo of the exhaust. Bolt f is setin the center of lever d, passing through boss 7c, andis secured therein by screw-nut l. On the projecting end of the boltf is set roller 7i, being held thereon by washer 'm and pin fm'. Roller h slides in the curved slot of cam a and is used to reduce friction in the operation of the valve.

Cam a is operated by rod c from an eccentric set on the shaft of the engine. The oseillating motion of cam a actuates lever d according to the curvature of the slot. It lifts the lever d when the cam ais moved by rod c in the direction indicated by the arrow shown in Fig.v 2, or moves it downward when the c urved slot of the cam Ct is shaped as shown in Fig. 5. The lifting or lowering motion is imparted to the lever d by the passing of roller h over shoulder h in the slot a. This shoulder is only about three-eighths of` an inch high, but as the bolt f sits in the center of the lever d the lift of the end connected by pini to the valve-head A will be double the lift at the center oi' roller h. Roller h is snugly fitted in the slot, and therefore no excessive motion of the valve is possible.

It will be observed from the shape of the shoulder in the slot that the motion of the valve must be instantaneous and absolutely positive.

In Fig. 2 I have shown my improved valvegear operating an exhaust puppet-valve set in the chest of an auxiliary cylinder, the motion of the valve-gear being so timed that the valve is instantly closed when piston P reaches the position indicated in the drawings, is kept closed during the following threeu fourths of the outward motion of the piston,

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and when the piston P reaches the given point the valve is lifted again instantly and kept open while the exhaust is driven out during the full inward motion of the piston.

To facilitate a perfect adjustment of the valve to its seat, I employ the adjustable frame shown in Fig. 4:. In this construction the frame fr is vertically movable in the Valvehead. Its upper bar is provided with two dovetailed grooves, wherein the heads of setscrews s are fitted. These screws s pass through the cross-bar t and have their ends projecting above squarely shouldered. By turning these screws in corresponding direction the frame r is lifted or lowered. Similar set-screws may also be used from underneath to support the frame r, but I have found this unnecessary, as there is no strain on the frame to force it downward.

In Fig. 3 I have shown the diagram of a modified construction of the valve-gear adapted to be operated by an eccentric-cam. In this construction the cam a is formed as a bell-crank lever and is linked to lever c', fulcrumed on pivot c2 and actuated by eccentriccam x, driven by a transmission from the shaft of the engine. Spring y draws lever c downward, and thereby effects the return of the valve to its normal (closing) position after the eccentric-cam has lifted it.

I- claim as myinvention and desire to secure by Letters Patentl. The eombin ation with the exhaust-valve of a gas or gasolene engine, of gear comprising a sliding block set in the head of the valve, a pin set in the sliding block, a bracket secured to the valve-chest, a lever hinged to the bracket and having its other end pivoted on the pin set in the sliding block, a bolt set in the center of the lever, a roller set on the bolt and secured thereon by a washer and a crosspin, an oscillating cam, having a curved slot, composed of two segments of different diameters, connected by a short step, the roller engaging in the slot of the oscillating cam, actuated by an eccentric and a rod from the main shaft, and the lever, thus actuated by the oscillations of the cam, opening and closing the valve with a quick motion and holding it at the same time `under control so as to prevent its hammering against the seat.

2. In a valve-gear, comprising an oscillating cam, adapted to be actuated from the main shaft of the engine and having an appropriately-curved slot; a lifting-lever, hinged to a bracket, a bolt, set in center of the lever, and secured in its place by a screw-nut, a roller, set on the projecting end of the bolt and secured thereto by a pin and a washer, the combination with the valve of a verticallyadjustable frame, screws sustaining the frame in position, a sliding block sliding therein, and adapted to be connected by a pin to the lifting-lever.

In witness that I claim the improvements described in the foregoing specification I have ,signed my name in the presence of two subscribing witnesses. Y ERNEST LUDWIG TEUBERT. Witnesses: v

J. P. LESLIE, O. J. KIRK.

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