DE714241C - Pressurized gas tightening device - Google Patents

Description

Pressurized gas turning device The invention relates to a pressurized gas turning device for a one- or two-cylinder two-stroke internal combustion engine equipped with a crank bäusepiiinp, c. Such internal combustion engines regularly stop after the run-out so that the The piston stops a little before or after the lower tip. There are already procedures known for cranking such machines, in which the compressed gases in the crankshaft chamber are directed so that they act on the lower side of the piston. With this one However, there is still the shortcoming that starting is not possible if The piston. stops exactly at bottom dead center. In this case it is necessary that the crankshaft of the internal combustion engine first rotated a certain amount will. In the case of multi-cylinder machines that are started by means of pressurized gas Devices known to: the machine in the position suitable for starting bring to. However, these devices are very cumbersome and require a whole Number of machine elements.

According to the invention, this results in an advantageous one, the shortcomings the known devices remedial cranking device that vin in the pressurized gas supply line arranged spring-loaded control piston when turning against # -, iner spring force is shifted by the compressed gases, on the one hand the way for the compressed gases into the crankcase, on the other side an overflow channel, between the crankcase andHulbraum locked and at the same time opened when moving if necessary rotate one with the crankshaft (fen part, e .g. a counterweight, twisting acts.

In the drawing is an embodiment example with the features according to of the invention shown.

Fig. I shows a single-cylinder two-stroke internal combustion engine in section. Fig. 2 and 3 show different positions during cranking.

a is the cylinder and b is the piston of a single-cylinder two-stroke internal combustion engine with the connecting rod c and the counterweight of the usual type. e is the exhaust line, j the intake line, in which a non-return valve g sits, and li is the overflow channel. At the end of the overflow channel opening into the crankcase, a channel 1 is provided in the crankcase which is connected to a cartridge chamber by a pressure line k. From the channel there is another channel ii, which also opens into the crankcase. In the channel i sits a small piston o which is pulled into the channel by a spring j, lb where it rests against a stop q. In the retracted position, the piston o covers the channel ji. 'And is flush with the channel 1 on the inner wall of the crankcase.

The cranking process takes place as follows: When a single-cylinder internal combustion engine runs down, the piston always remains in the vicinity of bottom dead center, either before or after it. To throw the machine - the driver ignites a cartridge in the chamber . The cartridge can be ignited mechanically by a firing pin or electrically by a small battery or a crank inductor. The compressed gases developed during the explosion of the cartridge first throw the small piston o against the counterweight d (Fig. 2) and turn the crank so much that the piston b is in any case after bottom dead center. When the piston o pushes forward, the channel ji is opened and the overflow channel h. closed. The pressure nose: then flow through channel ii into the crankcase and drive piston b upwards. When the piston b goes up, the overflow channel k is closed at the confluence with the cylinder a. Since the same pressure prevails in the crankcase and in the channel i shortly after the cartridge has been fired, the small piston o is pulled back into its rest position by the spring p immediately after it hits the weight d. so that it is not in the way of the rotating weight and closes the channel ti again. When the piston b has reached top dead center, a small gap r is opened at the exhaust line z, so that the compressed powder gases can escape before the piston closes the exhaust line, c Z, again when it goes down. The charge of the cartridge must be so strong that the machine makes at least three revolutions. In the zweinn movement of the piston b upwards by d. - * e Ansauuleitung f fuel Toggle the beini - Esau-t, the second descent of the piston b through the overflow li in the cylinder a overall suppressed, and then the third high-Go of the piston b is compressed. The di2 machine is then set to normal operating status and continues to run on its own.

D. The advantage of the invention is that it is no longer necessary to bring the piston b by hand into the appropriate position before turning.

Claims (1)

PA TEiN TAN S P R UC 11 Pressurized gas tightening device for a one- or two-cylinder two-stroke internal combustion engine equipped with a crankcase pump, in which the pressurized gases are introduced into the crankcase and act on the underside of the piston. characterized by a disposed in the pressurized gas supply line fed2r 'is displaced is tightened, counter to a spring force by the compressed gases) ellase-eii control piston (o), on the one hand the way for the Dru' clgase releases in the Kurhelgehäuse., on the other hand überstromImnal (h ) between, crankcase and cubic capacity shut off and at the same time when moving, if necessary, to a part with the crankshaft umlaufendev part ' z. B. the counter-advertised «1 .. acts twisting.