CH135847A - Device for the recovery of flammable gases found in the crankcase of internal combustion engines. - Google Patents

Description

Device for the recovery of flammable gases found in the crankcase of internal combustion engines. The object of the present invention is a device for 1a. recovery of flammable gases in the crankcase of internal combustion engines.

Flammable gases are known to be found in the crankcases of internal combustion engines, partly from leaking cylinders during the engine. compression of the mixture explos.i. These leaks occur in all engines and are more or less important. Another part of these gases is obtained by vaporization of the lubricating oils contained in the crankcase, gräte ä. the heat c-reee during 1a. engine running.

It already exists. devices for recovering these gases. That according to the invention is distinguished therefrom in that it comprises a cylinder communicating on the one hand with the crankcase of the engine by an opening formed in this crankcase and on the other hand. with the admission of the engine, a piston controlled by a spring, moves in this cylinder under the suction action of the engine, so as to uncover a more or less large section of at least one groove formed in the internal wall of the cylinder and increasing in section from the end of the stroke of the piston, the release being the most relaxed, so that the quantity of gas passing through the varies automatically according to suction, at least one adjustable air intake being provided for the addition of air to the sucked crankcase gases.

The appended drawing shows, by way of example, one embodiment of the device.

The, fig. 1 is a top view of the device; fig. 2 is a section taken along the line q-B of la. fig. 1; fig. 3 is a section made along line C-D of 1a. fig. 2, and La. fig. 4 is a detail view.

The device represented comprises a cylindrical tube C communicating at its lower end, by a tube T, with any opening formed at a suitable place in the casing of a motor (not shown). The upper end of the tube C communicates, via a sieve 1i, with a tube J which leads to the inlet tube of the explosive mixture in the engine. A piston P can move in cylinder C under the suction action of the engine. This piston is guided by a rod H and compresses during its movement. ascending, a spring 11 whose tension is adjustable according to each type of motor to which the device is adapted. Three R grooves are made in the inner face of the cylinder. The section of these grooves increases from their lower end to the highest point that the piston can reach. <I>Ar</I> holes are provided at the base of the cylinder for the air intake and their opening is controlled by a disc G fixed to the cylinder by a locking nut V. The gas sucked from the crankcase is mixed lange completely with the air admitted through the holes Ai-, when it passes through the grooves R. This gas, once mixed with air, passes through the orifice U to mix with that coming from the carburettor. also provide for tube J to terminate between the air intake and the carburettor, instead of to terminate between the latter and the engine.

I:e functioning. of the device which has just been described is easily understood. The depression created in the cylinder C, by the suction of the engine, raises the piston P more or less against the action of the spring ïbl, which reveals a more or less large section of the grooves R. It is it follows that the aspiration is communicated in the. part of the cylinder below the piston P and thence through the tube T to the crankcase. The crankcase gases thus sucked in are led to the engine while being mixed with it. air, the latter being admitted through the <I>Ar</I> holes, the flow of which is adjustable by means of disc G. This disc can be operated automatically to adjust the intake according to the intensity engine suction.

The present device can be used with most internal combustion engines, especially automobile and airplane engines. It makes it possible to achieve a very appreciable saving of gasoline, as proven by tests.

Thanks to the fact that the piston P moves along the grooves R providing a passage section for the mixture of flammable gases from the crankcase and air which is variable according to the position of the piston, which position depends on the suction of the engine, one obtains an automatic distribution or control of the mixture in accordance with. the momentary speed of the motor. Thanks to the fact that this automatic control is carried out on the mixture and not on the flammable gases only, we obtain, in addition to fuel savings, an increase in energy pa.i# a better displacement. In addition, the deposit of soot on the spark plugs and in the engine explosion chamber, due to excess fuel, is also avoided, thanks to this automatic control, which does not require, as in certain similar devices known. f driver's attention.

The device described above can be modified according to the various types of engines to which it is to be applied. The main difference between the various embodiments of the device relates to the size and construction details of the automatic mechanism for varying the admission of gases. On the other hand, the tube J can be replaced by a flange joitn to fix the device. the engine intake pipe; but such a joint is more difficult to fit, since it must conform exactly to the dimensions of the flanges of the engine to which the positive device is applied. The sieve K can be omitted in certain cases, but its. presence is preferable since it effectively ensures good mixing of flammable gases with air and prevents the. propagation of a flashback in the device and the casing. The disc G, instead of being arranged in the cylinder C, could be placed at. the outside of the latter, but in this case it might accidentally be rotated:

Claims (3)

CLAIM Device for the recovery of flammable gases found in the crankcase of internal combustion engines, characterized in that it comprises a cylinder communicating on the one hand with 'the crankcase of the engine by an opening formed in this crankcase and on the other part with the intake of the engine, a piston controlled by a spring moving: in this cylinder under the suction action of the engine, so as to uncover a more or less large section of at least one groove provided in the inner wall of the cylinder and increasing in section from the end of the piston stroke, the spring being the most relaxed, so that the. The amount of gas passing through the device varies automatically depending on the suction, at least one adjustable air intake being provided for adding air to the crankcase gases sucked in. SUB-CLAIMS 1 Device according to claim, characterized in that the adjustable air intake consists of at least one hole provided in the cylinder on the same side, relative to the piston, as that through which the gas, and closed in an adjustable manner by a perforated disc. 2 Device according to claim, character ized in that the air intake is automatically adjustable according to the intensity of the motor suction. 3 Device according to. claim, characterized in that the cylinder is connected to the engine intake, downstream of. carburetor. .1 Device according to claim, characterized in that the cylinder is connected to the engine intake between the carburettor and its air intake. 5 Device according to claim, characterized in that the connection of the cylinder to the admission of the engine is carried out. using a flange joint. b Device according to claim, characterized in that a screen is arranged in the cylinder near its end communicating with the engine intake. 7 Device according to claim, as described with reference to the accompanying drawing.