US349512A - mclellan - Google Patents

Description

(No Model.) 2 Sheets-Sheet; 1,

R. A. MOLELLAN.

ENGINE VALVE GEAR.

No. 349,512. Patented Sept. 21, 1886.

(No Model.) 2 Sheets-She'et 2.

R. A. MoLELLAN.

ENGINE VALVE GEAR.

No. 349,512. Patented Sept. 21, 1886.

.UNITED STATES PATENT OFFICE.

ROBERT A. MOLELLAN, or SAN FRANCISCO, OALIFOR'NIAr ENGINE-VALVE GEAR.

SPECIFICATION forming part of Letters Patent No. 349,512, dated September 21, 1886.

Application filed June 11, 1886. Serial No. 204,875. (No model.)

one of thesteam and one of the exhaust valves.

Figs. 2 and 3 are side views of the eccentrics and links. Fig. 4 is a rear view of the links.

Ais the bed of the engine; 13, the cylinder; 0, th e crank wheel or disk; and D D are eccentrics having the eccentric-rods E and F, as shown.

G is a rocker-arm having its upper end pivoted or fulcrumed at H to the upper end of a lever, L, which is fulcrumed at the center, and

from its lower end 'a rod, I, extends to the rockershaft J, which by suitable connections aetuates the exhaust-valves of the engine.

The eccentric-rod E is hooked or otherwise connected with the arm G by means of a pin, K, which is fixed to the arm, the eccentric which actuates this being set at one hundred and thirty-five degreesin advance of the crank.

The eccentric-rod F connects with a rockerarm, L, fulcrumed at the center, and the rod M connects the arm Gwith the rocker-arm N, which is centrally fulcrumed upon the framework of the engine, the rod M connecting its lower end and the rod 0 connecting its upper end with the rocker-arms P, which serve to lift the valves. The upper end 'of the swinging arm G is slotted, as shown at G, and the end of the arm M is connected with a block which slides in the slot.

The governor a "may be of any well-known or desired form, and is connected by a rod, 1),

with the rod M, so that when the speed of the engine increases the end of the rod will be drawn upward in the slot in the arm G, so that it and the valves will be moved to close the valves quicker. \Vhen the engine moves slower, the opposite result takes place.

The valves are of the ordinary puppet form, as shown at Q, and the stems R connect with the vertically-moving frame S, which is slotted so as to receive the outer end of the arm T. This arm is fulcruined upon a standard, as shown at U, and the toes V, which are con nected with the shaft or rocker-arm I, act to lift the lever T, and with it the guide and valve stem. The valves are set very close to the passages in the cylinder, so that there is the least possible lost space at this point. The construction of the levers T is such that the toes V commence acting upon them at the outer or free end, so that they have the most power to raise the valve from its seat when they first begin to act, and after this result is attained the valve will be lifted almost instantaneously the remainder of the distance, so that it is open to its full amount very shortly after the piston commences its movement in the cylinder.

The operation of this gear is as follows: The eccentric which moves the rod F is set to move with' the crank-pin, and the eccentric which drives the rod E is set one hundred and thirtyfive degrees in advance of the crank. The rod F connects with the lower end of the centrallyfulcrumed lever L, and the rod E with the center of the arm G, the'upper end of which is journaled to the upper end of L, so that it receives the resultant motion due to the action of the two eccentrics, and this motion is communicated to the rod M and valves, as before described.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. A lever centrally fulcrumed to the frame and having its lower end connected with an eccentric in a radial plane with the crank, and a second lever, the upper end of which is suspended from the upper end of the first and its center connected with a second eccentric set in advance of the crank, in combination with a rod adjustable upon the second lever and connected with the steam-admission valves, substantially as herein described.

2. Alever centrally fulcrumed to the engineframe and having its lower end connected with an eccentric upon the engine-shaft, and a second lever fulcrumed to the upper end of the first one, with its central portion connected with a second eccentric set at an angle with the first one, and the lower end of the second lever connected by a rod with the exhaustvalve, in links G and L, the eccentrics connected with combination with a rod adj ustably connecting them, and a governor whereby the connections the upper end of the second swinging lever of the valve-lifting toe with the link is regu- With the steam-admission valves and a govlated by the engine-speed, substantially as [5 5 ernor by which the position of the rod is deherein described.

termined, substantially as herein described. In witness whereof I have hereunto set my 3. The steam-valve with the vertical stein, hand. the lever connected with the stem at one end ROBERT A. MQLELLAN. and having the opposite end fulcrnmed, as Witnesses: 10 shown, and an oscillating lifting arm or toe act 0. 1). COLE,

ing upon the lever, in combination with the J. H. BLOOD.

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