US1518673A - Engine - Google Patents

Description

Dec. 9, 1924. 1,518,673

P. A. PEARCE ENGINE Filed p l 1924 2 Sheets-Sheet 1 "II-mumm- B H. Pearce m INVENTOR My WITNESS: ATTORNEY Dec. 9,

P. A. PEARCE ENGINE Filed April 12 1924 2 Sheets-Sheet 2 .8. Pearce INVENTOR ATTORN Q- JZ .5 v /m/m/m m ll mmm WWII WITNESS:

Patented Dec. 9 1924.

UNITED STATES PRINCE ALBERT PEARCE, 0F NORRIS CITY, ILLINOIS.

i ENGINE.

Application filed April 12, 1924.

To all whom it may concern:

Be it known. that I, PRINoE ALBERT PEARoE, a citizen of the United States, residing at Norris City, in the county of White and State of Illinois, have invented new and useful Improvements in Engines, of which the following is a specification.

This invention relates to internal combustion engines and has for its object the provision of an engine so constructed and arranged as to eliminate all necessity for the employment of the usual valves, rocker arms, cams and other devices involved in valve actuation, the advantage being that losses caused by leakage at various points will be prevented.

An important and more specific object is the provision of an engine of this character in which the valve arrangement consists of ports in the engine cylinders successively covered and uncovered by ported pistons whereby the intake and exhaust will be controlled automatically.

A further object is the provision of an engine of this character which will be simple and inexpensive in construction, easy to control and operate, smooth and powerful in action, eflicient and durable in service and a general improvement in the art.

With the above and other objects and advantages in view the invention consists in the details of construction to be hereinafter more fully described and claimed and illustrated in the accompanying drawings, in which:

Figure 1 is a longitudinal section through an engine constructed in accordance with my invention,

Figure 2 is a horizontal cross section on the line 2-2 of Figure 1,

Figure 3 is a horizontal cross section on the line 33 of Figure 1 and Figure 4 is a detail section through the intake valve taken on the line 4-4 of Figure 1.

Referring more particularly to the drawings I have shown the engine as comprising a base or crank case 10 on which is bolted at 11 the cylinder structure 12. In the present instance one twin cylinder is shown and it is obvious that as many units as desired may be provided. Within the crank case is the usual crank shaft 13 mounted in suitable bearings 14 and formed with a crank portion 15 with which is engaged a connecting rod 16 in turn connected with a cross-head Serial No. 706,155.

17 movable longitudinally within the case 10.

The cylinder structure or unit 12 includes two compartments or cylinders 18 and 19 separated by a division wall 20 which terminates short of the center of the cylinder head 21. All the walls are formed with passages 22 and the head is formed with a space 23 therein, all for the purpose of providing: space for the circulation of water to effect cooling. A spark plug 24 or other ignition device is threaded through the usual hole in the cap at a point immediately above the division wall 20. Mounted for reciprocation within the cylinders 18 and 19 are pistons 25 and 26 respectively carried by piston rods 27 which are connected with the slide 17. The piston 25 is formed with a passage 28 extending therethrough from top to bottom while the piston 26 is formed with an l.- shaped passage 29. At the top of the piston 25 is an upwardly opening normally spring closed'check valve 30 for a purpose to be described. Quite naturally the pistons are provided with the usual packing rings 31 to prevent leakage.

At one side of the cylinder unit is an intake manifold 32 connected with a suitable carburetor not shown and communicating with the interior of the cylinder 18 through upper and lower ports 33 and 34 respectively, which ports are adapted to be covered and uncovered successively by the piston 25- A spring pressed upwardly opening check valve 35 is located in the intake manifold 32 as shown. The cylinder 19 has its wall formed with an exhaust port 36 communicating with an exhaust pipe 37 for the outlet of exploded or burnt gas.

In the operation, it will be seen that both pistons operate in unison. On the upstroke of the piston 25, suction is produced below it and a charge of mixture is sucked in through the port 34. The previously admitted charge in advance of the piston 25 is compressed between both pistons and the cylinder head is exploded by the spark plug 24. As both pistons successively move downwardly on the working stroke, the L-shaped passage 29 will come into registration with the port 36 so that the exhaust gases will escape. On this working stroke, the previously admitted charge of mixture below the piston 25 will pass through the passage 28 and enter the space above the piston. When the piston 25 reaches its lowermost position, the port 33 is uncovered which Will. permit an additional supplyto enter the cylinder. At all times the operation of the pistons in unison together With the transferring of a fresh charge through the piston 25 will operate to insure proper action so that there will be great smoothness in the running of the motor combined With maximum power. The principal teature of advantage is that there are no elaborate valves and valve actuating mechanisms to get out of order and cause leakage, uneven running, noise and the like.

While I have shown and described the preferred embodiment of my invention it is of course to he understood that I reserve the right to make such changes in the form, construction and arrangement of parts as Will not depart from the spirit of the in vention or the scope of the suhjoined claims.

I claim:

1. In an internal combustion engine, a crank case having a crank shaft therein formed With a crank portion, a slide mounted Within the crank case and connected with said crank portion, a cylinder unit divided into similar cylinders, one cylinder having spaced intake ports communicating with an intake manifold and the other having an exhaust port, and pistons mounted within the respective cylinders and connected with said slide, one piston having a transfer passage therethrough and the other having an exhaust passage.

2. In an internal combustion engine, twin cylinders arranged side by side, an intake port for one cylinder, an exhaust port for the'other, said cylinders having communication at their outer ends, pistons mounted ithin the cylinders for simultaneous movement, an exhaust port in one piston adapted to register f ith the first named exhaust port and a valved transfer passage'in the other piston.

3. In an internal combustion engine, a

pair of similar cylinders, a division Wall separating the cylinders and terminating short of the ends thereof, a head, an ignition device extending through the head at a point opposite the division Wall, one cylinder having upper and lower intake ports and the other having a single exhaust port, pistons slidalole Within said cylinders and one having a valved transfer passage and the other having an exhaust passage adapted to register With said exhaust port, and means connecting the pistons for simultaneous movement.

i. in an internal combustion engine, a pair of similar cylinders, a division Wall separating the cylinders and terminating short of the ends thereof, a head, an igni tiondevice extending through the head at a point opposite the division Wall, one cylinder having upper and lower intake ports and the other having a single exhaust port, pistons slidahle Within said cylinders and one having a valved transfer passage and the other having an exhaust passage adapted to register With said exhaust port, and means connecting the pistons for simultaneous movement, including a slide, rods connected with the slide and the pistons, and a crankshaft having crank portion connected With the slide.

5/111 an engine, a pair of cylinders arranged side by side and communicating at their outer ends, one cylinder having a pair of intake ports therein arranged in longitudinally spaced. relation and the other cylinder having an exhaust port, a pair oi simultaneously moving pistons Within the cylinders, the piston Within the first named cylinder having a valved transfer passage therein and the other piston having a port adapted to register With said exhaust port. In testimony whereof I a'liix my s1gna ture.

PRINCE ALBERT PEARCE.

Images