US2305772A - Diesel power ram - Google Patents

Description

met., 22, H942., K HAAGE 2,35f772 DIESEL POWER RAM Filed Sept. 19, 1940 f i f /7 fvf f 45 l Uff f f/f 9&4 /c

Patented Dec. 22, 1942 NITED STATES DIESEL POWER RAM Konrad Haage, Esslingen n the Neckar, Germany; vested in the Alien Property Custodian Application September 19, 1940, Serial No. 357,483 In Germany August 9, 1939 2 Claims.

My invention relates to power rams and the like of the Diesel engine type and more particularly to apparatus of this kind in which the ram proper constitutes the piston or cylinder of a Diesel engine and is lifted by each explosion dropping freely thereafter.

In my copending application Serial No. 332,807- filed May 1, 1940, for Diesel power ram I have disclosed a power ram of this type in which the impact of the ramk proper is utilized for the atomizing of the fuel, so that the high pressure pump and spray nozzle hitherto used for the purpose which are unfavorably influenced by the ramrning operation can be dispensed with. According to this invention the impact or blow of the ram upon a pan-like cavity arranged in the combustion chamber of the engine is utilized for atomizing the fuel deposited into this cavity.

The simplest way of operating such an engine seemed to introduce the fuel into the pan-like cavity during the upward movement of the ram proper. It has now been found that this mode of operation is unsuitable since the upward stroke of the piston and the current of fresh air sucked into the cylinder generate strong whirls which scatter unatomized fuel which is thus partly lost by escaping through the exhaust slits. Moreover atomization of the fuel then becomes very irregular, whereby the working strokes of the ram become unequal and its eiciency is considerably diminished.

These drawbacks are overcome according to the present invention by injecting the fuel into the cavity in the cylinder bottom only during the downward or compression stroke of the piston shortly before the piston reaches and covers the exhaust slits of the cylinder. By proceeding in this manner I avoid the necessity of injecting the fuel under high pressure and am enabled to correctly deposit it in the cavity, in which it is then uniformly scattered and atomized by the impact of the piston.

In the drawing affixed to this specification and forming part thereof, an embodiment of my invention is illustrated diagrammatically by way of example in longitudinal section.

Referring to the drawing, piston I which forms the ram proper, reciprocates in the cylinder 2 and, when dropping, strikes the cylinder bottom or anvil 3 which rests on the pile to be rammed. This anvil 3 is formed with a pan-like cavity 9 and the striking face I0 of the piston I is formed to t in this cavity 9. Liquid fuel deposited in the cavity 9 is scattered and atomized by the impact of the piston I so as to be immediateli7 burnt in the compressor space of the cylinder, due to the high temperature prevailing therein, and by its combustion pressure lifts the piston I. The gases of explosion are exhausted through the slits 5, whereupon fresh air is sucked in for the next combustion stroke. The exhaust ports or slits 5 are arranged at a point in the cylinder wall which is spaced from the fuel pump presently to be described by a distance greater than the axial length of the cylindrical piston walls.

The piston controls a metering pump -6 for the fuel, the fiaring top part I8 of the piston I acting on the rod I2, which projects into the cylinder 2, of the pump piston I3 which is acted upon by the spring I9. The fuel supply pipe 20 discharges from the fuel container l, provided with a check valve I5, into the space in front of the piston I3, from which a pipe 4 leads to the lower end of the cylinder. I prefer to insert another valve 2| between the pipe 4 and the metering pump 6.

In the operation of the ram fuel is allowed to flow from the container 1 into the pump cylinder whenever the pump piston I3 is forced back by the ram piston I. When this latter piston approaches the slits 5, its flaring end I8 allows the pump piston to move to the left whereby the fuel in the pump is forced through the check valve 2| into the bottom part of the cylinder 2, being deposited in the cavity 9. At the same time the air trapped below the piston I is forced out through the slits 5 until these slits are covered by the piston, but no disturbing movement of air occurs below the slits, where the fuel is discharged and collected.

In this manner the fuel is atomized in a particularly perfect and uniform manner.

I wish it to be understood that I do not desire to be limited to the exact details of construction shown and described for obvious modifications will occur to a person skilled in the art.

I claim:

l. A power ram comprising in combination, a substantially vertically arranged cylinder of a Diesel engine. a piston in said cylinder, one of said parts being stationary, the other freely reciprocable relative to the stationary part, means for depositing the quantity of fuel required for a ram stroke on the surface of the stationary part within said cylinder, which lies in the path of and is hit by said reciprocable part, when it drops, a gas exhaust port in one of said parts and means, arranged to be controlled by the other part during its downward or compression stroke, for actuating said fuel depositing means for fuel delivery onto said surface, whenever said other part approaches, but before it covers. said exhaust port.

2. The ram of claim 1, in which the cylinder is stationary, the piston reciprocable, while a mem ber operatively connected with the fuel depositing means projects into the path of the piston, a flaring portion of the piston forming the actuating means, the surface being the cylinder bottom surface and the exhaust port being spaced from said actuating means a distance greater than the length of the piston surface parallel to the inner cylinder surface.

KONRAD HAAGE.

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