US1579296A - Rotary-valve distributing device for compressed-air and like engines - Google Patents

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A ia; a 192a, mmzw N. FRANgms ROTARY VALVE DISTRIBUTING DEVICE FOR COMPRESSED AIR'AND LIKE ENGINES Filed Feb. 1, 1924 Patented Apr. 6, l926,

TE S

NICOLAS raanoors, or nanssoox, NEAR LIEGE, BELGIUM.

ROTARY-VALVE DISTRIBUTING DEVICE FOR COMPRESSED-AIR AND LIKE ENGINES.

Application filed. February 1, 1924.

To all whom it may concern:

Be it known that I, Nroones FRANQOIS, a subject of the King of the Belgians, residing at llressoux, near Liege, Belgium, have invented new and useful Improvements in R0- tary vali 'e Distributing Devices for Cornpressed-Air and like Engines, of which the following is a specification.

The present invention relates to an improved rotary valve distributing device for compressed air and like engines with single ormultiple cylinders, and more particularly to a rotary valve distributing device. ot the cylindrical type, provided with circumferential ports and recesses or channels controlling the admission, the expansion and the exhaust ot the air or other driving fluid, asingle device of this kind being sutiicient for any number of cylinders.

The essential feature of the rotary valve distributing device according to the invention resides in the particular construction and arrangement of its parts, whereby the rotation in one direction, the stopping, and the rotation in the other direction of a compresed air engine may be obtained by impartan angular movement to one of the concentric cylinders constituting the device, the particular arrangement 0*? the ports making possible to obtain on sta ing the engine a longer period or": admission than during normal running, with a view to avoiding dead centers.

In order that the invention may be readily understood, one en'ibodilnent or same. is, by =way or" exampleonly illustrated by the accompanying drawings, wherein:

Fig. 1 is a longitudinal section of a rotary valve distributing device according to the invention, which is in the present case placed above the cylinders and coaxial therewith.

Fig. 2, Fig. 3, Fig. i, Fig. 5 and Fig. 6 are transverse sections through the same device showing the parts in the positions which they occupy respectively when the engine is stopped, during the admission period on the engine being started, during the admission period when the engine runs normally, during the expansion period and during the exhaust period.

Referring to the said drawings, the device comprises three concentric cylinders, of which the first a is driven by the engine and rotates in the present instance at the same speed as that of the latter, while the second Serial No. 689,973.

Z) is stationary and the third 0 is capable of having a predetermined angular movement or fractional rotation imparted thereto by means'ot a suitable operating lever (Z integral therewith or suitably fixed thereon.

The three cylinders a, b, 0 are mounted in a casing e which may or may not be cast integral with the cylinders 1 2, 3, l of the engine, and is provided with ports f COHlHlLlDIlCZttlDg with the said cylinders and with ports g communicating with the ex-, haust pipe 7L.

The inner cylinder at is hollow and closed at both ends; a set of ports i, which are also provided in the cylinders b and 0 permits the admission of compressed air or other driving fluid via the inlet 72 provided in the casing e and by way otthe circular groove Z cut in the said casing.

The said cylinder (4 is also provided with ports m for the admission of the air at the required moment in each cylinder of the engine via the ports a, a or 0, 0 ot' the intermediate cylinder Z), according to which one or ones of these ports register with the corresponding port 29 or p. of the outer cylinder 0, and by way of the circular grooves Q and ports f of the casing e.

The inner cylinder (6 also has longitudinal recesses or grooves r communicating with circular grooves or channels 8 which in turn communicate with the exhaust pipe it via ports tin the cylinders b and c, circular grooves a cut .in the casing e, and the ports g. x

These recesses r serve to obtain the exhaust at the required moment through the. same ports a, n or 0, 0" and in a manner similar to the admission. The ports a, n and 0 0" form two sets of ports corresponding to the two dilterent directions of rotation of the engine; the ports a and 0 are made to serve when the engine runs normally and the ports a and 0 respectively serve for obtaining a longer period of ad mission, i. e. for forcing the admission, on starting the engine.

Thus, if the outer cylinder 0, which is as stated capable of angular adjustment by means of the lever (Z, is moved in the direction of the arrow as when the inner cylinder a is rotating in the direction of the arrow 2 (see Fig. 8), at a given moment the port a and a portion of the port a will be uncovered by the port 2) and while the passage for the admission is reduced the latter will have a duration proportional to the angle 5.

If the said movement of the outer cylinder c is continued until the port p exactly registers with the port n, the additional port n at the same time becoming obturated (see Fig. 4), the period of adnii ion will be proportional to the angle a smaller than the angle [3 by the quantity y and corresponding to the norn'ia-l running of the engine. It is obvious that the size ol' the additional port a or 0 determines the ar g'le of admission proportional to the increased period oi admission on starting the engine.

l' 's hen in practice and for mechanical reasons the distributing device will hate to rotate at half or a third of the speed of the engine, the said device would be provided with two or three series of the above described distribution ports.

I claim:

1. In a rotary valve distributii device for compressed air and like cng the combination of: a casing having connnunications with the engine cylinders and the exhaust pipe an inner rotary distributing cyl inder driven by the engine and having admission ports and exhaust channels formed therein; -a stationary intermediate cylinder arranged concentrically to said inner cylinder and having ports corresponding to each direction of rotation of the engine formed therein; and an outer cylinder having communication ports tt'orn'ied therein, mounted within the aforesaid casing concentrically to the two first-named cylinders and capable o1" angular adjustment in rela tion thereto whereby said coinnninication ports may be brought to register with such of the ports of the interniediate cylinder as will correspond to the rotation of the en gine in Whatever direction is desired; snl stantially as described.

2. In a rotary Valve distributing device for compressed air and like engines, the combination of: a casing having communications with the engine cylinders and the exhaust pipe; an inner rotary distributing cylinder driven by the engine and having admission ports and exhaust channels formed therein; a stationary intermediate cylinder arranged concentrically to said inner cylinder and having )llllS of sets of ports of which each set of a pair cor sponds to one direction, ol rotation of the engine; and an outer cylinder baring comniunication ports i'ormcd therein mounted within the aforesaid casing concentrically to the two firstnained cylinders and capable of angular adjustment in relation thereto whereby Silltl. comnrunication ports may be brought to register with such sets or" the pairs of sets of ports in the intermediate cylinder as will correspond to the rotation of the engine in 'whaterer direction is desired; substantially' as described.

:3. In a rotary valve dist outing dcricc for compressed air and like engines, the combination of: a casing have coniniunications with the engine cylinders and the exhaust pipe: an inner rotary distriluiting litltl driven by the engine and hat; g ports and exhaust channels sion formed therein; a' stationary intermediate arranged concczitrically to said in nor cylinder and having pairs of sets of ports ot Which each set of a pair corresponds to one direction of rotation of the engine and comprises a port tor normal running and an i tional port for obtaining a addi forced adnns, c i on starting the engine; and an outer cylinder having con'nnunication ports rorm d therein, mounted within using coicentri ally to the the aforesaid tuo first-named cylinders and capable of angular adjustment in relation thereto whereby said communication ports may be brought to register with either the port tor normal running alone or the additional port as Well of the sets of po 5; ol the intermediate cylinder corresponding to the desired direction of rotation of the engine; substantially as do? ribed.

In testimony \rhe'eot I signed hereunto my name.

NICOLAS FRANQOIS.

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