DE62475C - Device for adjusting the working piston in gas engines - Google Patents

Description

IMPERIAL

PATENT OFFICE.

The present invention relates to a crank mechanism, which should preferably be used in gas engines and through which the cylinder piston is actuated in such a way, that he z. B. only goes into the cylinder to a certain depth during the compression stroke and leave a certain empty space free to compress the gas mixture, while at the exhaust stroke it goes all the way down to the bottom of the cylinder and therefore all the combustion gases out expels the cylinder, for the purpose of admitting an always fresh gas mixture to explode.

On the accompanying drawing, FIG. 1 illustrates a partially drawn in section Side view of a gas engine equipped with the arrangement, FIG. 2 shows a detailed section the crank, Figs. 3, 4 and 5 show a modification thereof; Fig. 6 illustrates another Modification and the organs for the operation of the exhaust valve. · Figs. 7, 8, 9 and 10 illustrate another construction variant in its different working positions.

A is the upright machine frame with its shaft bearings aa ¹ .. In the same the shaft DD \ which is equipped with crank P and crank pin ρ rotates. B is the piston working in cylinder C , on which the oscillating piston rod H engages. The latter is not connected in the usual way, ie directly with the crank pin, but through the intermediary of an eccentric G, which is enclosed by the ring g attached to the piston rod. The eccentric disk G is attached to a hollow pin S and the latter rotates on the crank pin p, while the gears F and F ¹ are firmly keyed to the hollow pin. The wheels FF ¹ are in mesh with the gears E and E \ which are fixed on the shafts d and d ^{1 in} such a way that they cannot rotate, on which the inner shafts dd ¹ by any suitable means, in the present example by the Screw with nut N, are prevented. The diameter of the fixed gears EE ¹ is equal to half that of the wheels FF ¹ .

. In the modification illustrated in Fig. 3, the crankshaft consists of two separate parts DD ¹ and each part has its crank PP ¹ . The eccentric shown in Fig. 1 is replaced by two plates G, in which eccentric grooves V are cut. The plates G are firmly connected to the rotating cogwheels FF ¹ and are attached to the cranks with the latter by pins SS ^1. The fixed drives EE ^τ are pushed over the crankshaft and screwed to the machine frame by means of the splash ee ^1. The crank pin p, Fig. 1, is replaced in Fig. 3 by a pin ρ ^J which, going through the slots 5 s ^{1 made} in the crank arms, is supported with its ends in the eccentric grooves V. The oscillating piston rod H is attached to this pin p ^{1 by} means of the perforated head g ^l.

As before, here too the fixed drives EE ¹ have half the diameter of the gear wheels FF ¹ engaging in them.

Another modification illustrated in FIG. 6 is with connecting organs for

the exhaust valve fitted. A part. The crankshaft is solid, while the other part of it is hollow. Through this hollow shaft half the engine E the fixed supporting rod passes d ^1; ' the same is held in place by a nut N as above. On the hollow part D ^{1 of} the crankshaft a gearwheel / is keyed, the latter engaging in the gearwheel K seated on shaft k in order to actuate the exhaust valve as required by one of the known transmission means. .

In the third modification, illustrated in FIGS. 7 to 10, part of the toothing on the fixed drives is omitted, so that only half M is set with teeth, the other half being smooth.

In this case, the rotating gears F exceptionally have half the diameter of the fixed drives E.

In the mechanisms illustrated in FIGS. 1 to 6, it is assumed that the eccentric G is positioned upwards, namely in the initial position of the working stroke, ie the stroke in which the piston is advanced by the explosion of the mixture. During the following revolution of the crankshaft, the rotating gears have executed half a revolution as a result of their unwinding on the fixed drives E. When the piston descends, the eccentric G has been set down, which now pushes the piston down to the bottom of the cylinder and the combustion gases are completely blown out. During the following revolution, the upward movement of the piston causes the suction and the subsequent downward movement to compress the gas mixture, because during this period the eccentric has moved upwards again due to the corresponding rotation of the gears F , so that the piston is able to compress the Mixture leaves the required free space above the cylinder base in order to then start the four-stroke again.

In the machine illustrated in FIGS. 7 to 10, the piston in FIG. 7 is at the starting point of the explosion stroke with the eccentric turned upward. The rotating gear F remains untouched during the following ascending stroke, in that there are no teeth on the relevant half of the fixed gear E. The pressure exerted here on the piston rod in the cylinder keeps the eccentric in an unchanged position, so that it assumes the position shown in FIG. 8 at the end of the first stroke. During the decline, in which the fiery gases are expelled, the rotating drive engages in the toothed part M of the fixed gear. Since the diameters are in the ratio of 1 to 2, the said drive F is given a rotation which turns the eccentric downwards so that the piston at the end of the exhaust stroke is just above the cylinder base (Fig. 9). With the next half turn the rotating drive F is free again, and since the suction of the fresh mixture exerts a certain tension on the piston rod H , the eccentric remains in the same position. The piston therefore assumes the position shown in FIG. 10 at the end of the suction stroke. When descending during the compression stroke, the eccentric makes a turn in order to be directed upwards again, in order to free the compression space (Fig. 7), whereupon the same cycle begins again. Of course, in the arrangement illustrated in FIGS. 7 to 10, the toothing could also be omitted entirely and simple friction rollers could be used instead.

Claims (4)

Patent Claims: ι. A crank device for adjusting the cylinder piston in gas engines, in which the piston rod is connected to the crank pin by an eccentric G , which assumes a position diametrically opposite to the crank pin with each revolution of the crankshaft, so that once between the piston and cylinder base a double eccentric stroke corresponding to the double eccentric stroke Space remains free for the compression of the gas mixture, while the piston descends to the cylinder base during the next rotation in order to expel the gas residues. 2. In the crank device marked under 1. the device for actuating the eccentric G, consisting of the gear wheels FF ¹ rotating with the eccentric on the crank pin , which mesh with the stationary, half as large gear wheels EE ¹ , whereby the Crank also takes place a full turn of the eccentric. 3. A modification of the movement device marked under 2., in which the crank pin runs in eccentric grooves V of the discs GG ¹ , which rotate together with the gears FF ^u on the corrugated pin 5 S ¹ on the cranks, the crank pin in longitudinal slots ss ¹ the crank slides and immediately with the piston _r Rod is connected, while the fixed gear EE ¹ are screwed to the machine frame. 4. A modification of the movement device identified under 2. and 3., in which the fixed drives EE ^{1 are} only provided with teeth over half their circumference, while the gear wheels FF ¹ rotating with the eccentric G on the crank pin are toothed over their entire circumference , but only half as large as the solid shoots EE ¹ (Fig. 7 to 10).
The arrangement of the fixed drive wheel E on a plane passing through the hollow crankshaft D ¹ d bar ¹ in connection with the D? driven transmission wheels JK for actuating the exhaust valve (Fig. 6). For this purpose ι sheet of drawings.