US911852A - Rotary engine. - Google Patents

Description

W. D. TUTT.

ROTARY ENGINE.

v APPLICATION FILED rn.a,19os.

91 1,8252,l Patented Feb. 9, 1909. 2 sHBBTs-sHBBT 1.

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W. D. TUTT.

ROTARY ENGINE.

APPLICATION FILED I"BB.3,1908.

A. Patented Feb. 9, 1909*.

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Arron/VEN Specification of Letters Patent.

ROTARY ENGINE.

Patented Feb. 9, 1909.

Application filed February 3, 1908. Serial No. 414,010.

To all whom it may concern:

Be it known that l, WILLIAM D. TUTT, residing at Elberton, in the county of Elbert and State of Georgia, have invented certain new and useful Improvements in Rotary Engines, of which the following is a specification.

My invention-relates to certain new and useful improvements in rotary engines of the sliding piston type wherein a rotator carries sliding pistons to coperate with the steam passages of a casing in which the rotator is mounted.

The invention comprises certain novel details of construction, combination and arrangement of parts all of which will be rst described in detail, then specically pointed out in the appended claim, and illustrated in the accompanying drawings, in which Figure 1, is a perspective view of my invention. Fig. 2, is a longitudinal section taken substantially on the line 2 2 of Fig. 3. Fig. 3, is a horizontal section thereof on the line 3 3 of Fig. 2. Fig. 4, is a detail elevation of a part of my invention showing the valve controlling gear and the reverse gear mechanism.

Referring now to the accompanying drawings, in which like letters and numerals of reference indicate like parts in all of the figures, l represents the main frame of my engine which forms the casing and consists of the base la, the main frame portion 1b and the closure plates 1c, the main frame 1b and the plates lc inclosing an elliptical piston chamber 1d, as indicated, and the casing 1 is stationary and receives the rotator 2. The rotator 2, shown most clearly in Figs. 2 and 3 of the drawings comprises the annular or ring portion 2CL and the side plates 2b which are formed with apertured hubs or sleeves 20-2c respectively, the sleeves 2c being mounted on a shaft 3 that is non-rotatably held in bearings 1X supported from the base 1a of the main frame. The shaft 3 'projects through the casing l and through the hubs or sleeves 2c of the rotator, as clearly indicated in Fig 2 of the drawings. The rotator 2 is formed with an internal chamber 2d and is provided with a series of internally projecting lugs 2e formed with the annular portion 2a of the casing and provided with passages 2f for the pistons 4 4@L and 5 5@L respectively. The disks 2b of the casing have guideways 2g for the sliding pistons 4 4? and 5 5il respectively.

Mounted on the non-rotatable shaft or spindle 3 and within the piston chamber 2d isv a pair of cams 6 and 7, whose centers lie in the longitudinal aXis of the elliptical piston chamber 1d, as clearly indicated in Fig. 2 of the drawings. The piston 4 is connected with the cam 6 through a strap 8a, and link arm 8b that is pivoted at 8 to the piston 4, while the piston 4a is similarly connected with the cam 6 through a strap 9a, link arm 9b and pivotal connection 9, as will be readily understood by reference to Figs. 2 and 3 of the drawings.t The cam 7 which controls the pistons 5 5* is cooperatively connected with the pistons 5 and 5a in a manner similar to the connection between the pistons 4 4a and the cam 6, z'. c., the piston 5 is connected with the cam 7 through a strap 10a, link arm 10b which is pivoted at 10c to the piston 5 while the piston 52L is connected to the cam 7 through the strap 11a, link arm 11b and pivotal connection 11C. Thus it will be seen as the rotator rotates in the direction of the arrow in Fig. 2, the cams 6 and 7 being stationary, the pistons 5 5aL and 4a will Operate in separate sets, each set 5 5*l and 4 4a being operated by their respective cams 7 and 6 in a manner which will be presently more fully explained.

12 and 13 designate the valve mechanisms which control the operation of the engine. rlhe casing 1 is provided with a pair of ports 12a l2b, one of which communicates with the steam passage 1m and the other communicates with the steam passage l, it being understood that the rotator 2 divides the elliptical steam chamber 1d of the casing into two steam passages, lm l respectively. The ports 12a-12b communicate with a steam inlet chamber 12c to which steam is led from the steam pipe 12d, a slide valve 12v being interposed to control the communication between the ports 12a 12b and the steam inlet chamber 12c of the valve.

12e designates an exhaust which has a pair of ports 12f 12g respectively, the exhaust ports 12f and 12g being arranged to communicate, at times, with the by-passes 12h 12k respectively of the slide valve 12V, thus when the slide valve 12v is positioned as indicated in Fig. 2, the port 12a will be in communication with the steam inlet 12c while the port 12b will be in communication with the exhaust 12f through the ports 12g and the by-pass 12k. rEhe valve 12V has a stem 12s which will hereinafter be again referred to.

The construction of the valve mechanism 13 is substantially identical with that of the valve mechanism 12, it including the ports 13a-13b, steam chamber 13"/7 steam inlet 131 and exhaust 13C, exhaust ports 13 and 13g, slide valve 13V having the by- passes 13h and 13k and provided with the stem 13S, as clearly indicated in F ig. 2 of the drawings. The slide valves 12v and 13" are operated through a valve gear mechanism which is clearly shown in Fig. 4t of the drawings, by reference to which it will be seen that the valve stem 12s is connected with a lever la that is ulcrumed at 14a on a suitably projecting lug formed on the plate 1c oi' the casing. The valve stem 13S is similarly connected with a lever 15 similarly fulcrumed at 15a to the casing wall.

Mounted on each of the levers 14 and 15 are sliding carriages 16 and 17 respeo tively that are linked together through a link 18 and connected with the reversing rod 19 that is controlled by the reverse lever 20, as clearly shown in Figs. 1 and loi the drawings. The sliding carriage 16 is con nected with a cam operated plunger 21 through a pitman 22, the plunger 21 havinga cam engaging face 212L and mounted in a bearing 2lb. A coil spring 21C is interposed to normally hold the plunger 21 in a given position. A second plunger 23 is provided to cooperate with the carriage 17 to which it is connected through a pitman The plunger 23 has a cam engaging face 23a and is slidable in a bearing 23b and is spring pressed by a spring 23c to its normal position.

25 and 26 designate cams carried by gears 25a--26a respectively that are mounted on the stub shafts 25h-26b respectively formed on the casing wall 1c. The gears 25a-26a mesh with a master gear 27 keyed to the sleeve 2c of the rotator so as to rotate therewith and impart the rotary motion oit the rotator to the cams 25 and 26 respectively. The cams 25 and 26 are so arranged as to operate the plungers 21 and 23 at certain definite intervals to move the valves 12"-13b to close orf the ports 12--132L at proper times.

S0 far as described, the manner in which my invention operates can be best explained by reference to F ig. 2 of the drawings. Assume the rotator 2 to be rotating in the direction of the arrow, the piston 5 being in its position of greatest extension the port 12@L being in communication with the source of steam supply from the chamber 12C, as indicated, while the port 13a of the valve mechanism 13 is closed. its the rotator rotates and as the piston d passes the port 13a the cam 26 will become disengaged trom the plunger to allow it to return to its normal position and rock the lever 15 to move the slide valve 13" to open the port 13:L into communication with the steam chamber 13u so as to allow a charge of live steam to enter the steam passage 1 between the piston 4a and the port 13a. is the piston reaches the port 13" and ust prior to passing the saine, the cam 2f; engages the plimgcr 21 and shifts the valve 12 to close the port 12nl from communication with the steam chamber 12, thus cutting oit the steam supply in the passage lm. ihe valve 12" is so timed as to leave the port 12a' cut oit until the piston 5QL passes the saine, after which the cani 25 releases the plunger 21 to permit the valve 12b to return to the position shown in Fig. 2 of the drawings. its the piston et@ on its travel about reaches the port 12b the valve 13v will again cut oii" the port 13"L until the piston 1- has passed the port 13a, when a new charge steam will be admitted therethrough to the piston 4t.

From the foregoing it will be seen that live steam is admitted to one passage 1m until the piston in suoli passage has reached the limit of its stroke in such passage and the steam therein has become more or less eX- panded and as soon as this condition in the iirst pz 'sage is reached the steam will be supplied to the other passage, 1, to cop Y erate with its Jiston at the beeinnin` of its active stroke, thus always keeping a full head ot steam operating on a piston, causing a very steady and eifective running of the engine.

tir" course, the cams 25 and 26 may be so set and arranged that the valves 12V and 13v will be operated to close the ports 12L and respectively at any desired time, such for instance as when the piston 5 is in the position shown in Fig. 2, the valve 12v may be made to close and remain closed until the piston 5a passes the port 12 by simply changing the position of the cam 12, as will be readily apparent to those skilled in the art; similarly the valve 13V may be arranged and operated, as l do not contine myself to any speciiic valve gear or valve controlling mechanism.

l'n order to reverse the engine the lever 2O is simply thrown over from the position shown in 1 and t to the position shown in dotted lines in Fig. 4t to bring the Asliding carriages 17 and 16 to the right of the pivot centers 15aL and la of the respective levers 15 and 14;.

From the foregoing description taken in connection with the accompanying drawings it is thought the complete construction operation and numerous advantages of my invention will be readily understood by those skilled in the art to Which the invention appertains.

What I claim is:

In a rotary engine, a casing inclosing a substantially elliptical chamber, a rotator mounted centrally in said chamber and dividing the chamber into a pair of steam passages of equal area, said rotator consisting of a closed hollow drum formed of side Walls and a peripheral Wall, a series of in- Wardly projecting portions carried by the peripheral Wall and provided With radial piston passages, said side Walls of the rotator also provided with radial grooves on their inner surfaces to cooperate With their respective piston passages, two sets of diametrically opposite pistons mounted to slide in said passages and said radial grooves and form a closure for said passages, one set of slide pistons cooperating with one steam passage of the casing and the other set cop erating with the other steam passage of the casing, said rotator having laterally projected apertured hubs passing through apertures in the side Walls of the casing, a shaft 25 passing through said hubs and said rotator, means for holding said shaft from rotation, a pair of stationary cams carried by said shaft Within the rotator, one cam for each set of pistons, straps passing around said cams and having arms pivotally connected With the respective pistons and valve devices for admitting steam to the steam passages and exhausting steam therefrom and means for operating said valve devices.

WILLIAM D. TUTT.

Witnesses:

ALBERT R. DIETERICH, JOHN T. SCHROTT.

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