Abstract:
This invention relates to an apparatus for producing a rotary motion force by means of a compressed gas rotary engine, rotary type with pistons in the circular rotor, consisting of a housing, a rotor with cylinder chambers containing pistons that has a rod containing a bearing which rotates against a stationary cam, the rotor is connected to a shaft, and combined with a r rod guiding system This engine may be produced in any suitable size and contain as many pistons as needed. More than one engine may be attached together. The engine has many uses such as to power machinery, automobiles, motorcycles, boats, generators, etc.

Description:
BACKGROUND OF THE INVENTION 
       [0001]    This invention relates to an apparatus for producing a rotary motion force by means of a compressed gas engine of the rotary type with pistons, provided with a rotor which has a circular shape and contains pistons which reciprocate in the rotor. The rotor is rotary mounded on a centrally located engine shaft in a fixed housing having a cavity formed by a circular peripheral inner wall and two side walls. The pistons are reciprocally mounted in a cylinder in the rotor and reciprocation of the pistons are guided by a fixed piston guide plate on the piston&#39;s rod and the rotor is rotated by the piston rod putting pressure on the stationary cam. 
         [0002]    Many rotary engine have been invented in the past such as the James Watt rotary steam engine, Gilbert&#39;s engine, Cooley&#39;s engine, Selwood engine, Wankel&#39;s engine, Walter&#39;s engine, Farwell&#39;s engine, Mercer engine, Porsche rotary engines, Virmel engine, Kauertz engine, Geiger engine, Franke engine, Blount&#39;s engines and others but all of these are different than the engine of this invention. 
         [0003]    The improved engine of this invention is of the novel rotary type engine powered by means of a compressed gas. This novel compressed gas rotary engine with pistons reciprocating in the rotor as the rotor rotates, and the pistons reciprocal motions are guided by piston guide plates on each side of the piston rod and slots in the piston which reciprocates over the shaft thereby keeping the piston from rotating. The engine of this invention is entirely different from Blount&#39;s U.S. Pat. No. 6,167,850 which is a combustion engine where as the engine in this invention is powered by compressed gas and has longer power stroke of 180 degrees compared to a 90 degree power stroke in Blount&#39;s U.S. Pat. No. 6,167,850 rotary engine. In this invention&#39;s rotary engine the eccentric stationary cam is round and improves the power and smoothness of the rotation of rotor. The engines of this invention has only two strokes, a expansion (power) stroke produced by compressed gas and an exhaustion stroke. It can not utilized as combustion engine because it does not have a suction stroke or compression stroke and it does not need a cooling system. The improvements of this compressed air rotary engine over Blount&#39;s U.S. Pat. No. 6,167,840 are: 
         [0004]    1. Utilizes a compressed gas which can be re-used instead of a combustion mixture thereby producing no toxic gases; 
         [0005]    2. Has only 2 strokes, expansion and exhaustion instead of 4 strokes, suction, compression, ignition and exhaustion; 
         [0006]    3. Has a longer power (expansion) stroke of 180 degrees instead of 90 degrees; 
         [0007]    4. This engine is much simpler to manufacture, simple in construction because it doesn&#39;t require any carburetor or fuel injection system, cooling system or compression system and lighter material may be used in the construction of this engine: 
         [0008]    5. The compressed gas can be captured and re-compressed and re-used. 
         [0009]    7. The compressed gas can be produced by use of an electric compressor and not use any carbon products which produces carbon dioxide, nitrogen oxides, sulfur oxides or other toxic products 
         [0010]    8. The stationary cam of this engine is eccentric and round rather than irregular shaped and give a more smoother rotation of the rotor and reciprocation of the pistons. 
       SUMMARY OF THE INVENTION 
       [0011]    The objection of the present invention is to produce an improved rotary engine that doesn&#39;t require any combustion products. Another object is to provide a novel apparatus which is a rotary engine powered by a compressed gas that can be re-used and that can be compressed by an electric compressor. Another object is to provide a 2 stroke, expansion and exhaustion, engine. Another object is to provide an engine with a 180 degree expansion (power) stroke. Another object is to provide and engine that doesn&#39;t require any cooling, ignition or combustion fuel systems. Another object is to provide and engine with one or more cylinder chambers. Still another object is to produce multiple arrangement of the compressed gas rotary engine of this invention. 
         [0012]    The basic compressed gas rotary engine with reciprocal pistons of this invention consists of stationary cylindrical housing with cylindrical inner walls, front and back side walls, circular rotor rotatable mounted in the housing on a centrally located round shaft and rotates with the shaft, rotor contains circular cylinder chambers for the reciprocating pistons which are reciprocally guided by a piston guide plate and slots in the lower portion of the piston which reciprocates over the shaft. The rotor has a centrally located chamber to house the stationary cam and oil chamber. The rotor contains expansion chambers (cylinder chambers) above the pistons which are sealed off by means of seals on the rotor and rings on the pistons. The rotor is attached to the shaft and rotates with the centrally located shaft. The round shaft extends through the center of the side walls. The cylinder chambers volume vary in size when the rotor rotates and the pistons reciprocate thereby the strokes of expansion and exhaustion takes place in the cylinder chambers. 
         [0013]    The apparatus of this invention is relatively simple in construction and operation whereby the engine can be produced at relatively low cost. Fewer parts are required in its construction when compared with conventional reciprocal engines. This new engine design improves the efficiency of the rotary engine operation, gives a longer piston power stroke, doesn&#39;t give off any undesirable exhaust fumes or carbon dioxide, carbon monoxide, nitrogen oxides and is extremely desirable. The rotor acts as a fly wheel but an addition fly wheel may be attached to the shaft. Two or more of the compressed gas rotary engines of this invention may be attached together. 
         [0014]    The one, two or more cylinder rotary compressed gas powered engine of this invention consist of: 
         [0015]    1. Housing, a stationary hollow cylindrical housing having a cylindrical inner peripheral wall which forms a circular cavity with room for a rotor to rotate, and has a front side wall and a rear side wall. The housing has passage way for admitting a compressed gas to the cylinder chamber and passage ways for discharging expanded compressed gases from the cylinder chamber. 
         [0016]    2. rotor, a rotatable cylindrical rotor with a centrally located chamber and/or oil chamber and one or more cylinder chambers extending from the rotor&#39;s peripheral wall down to the centrally located central chamber and oil chamber, front and posterior wall with means for the posterior wall of the rotor to attach to the shaft and an opening in the center of the anterior wall of the rotor for the shaft pass through and cams stationary attachment to pass thru. The rotor has compression seals and oil seals to seal the cylinder chamber (expansion chamber) and central chamber from each other. 
         [0017]    3. piston, a cylindrical piston which reciprocates in the cylinder chamber of the rotor, and has rings on the peripheral surface to seal the cylinder chamber from the centrally located central chamber containing the stationary cam, shaft and oil chamber. The piston has a piston rod containing a bearing located centrally on the bottom of the piston and has means to guide the reciprocal motions rotation of the piston and an to prevent the piston from rotating and to apply a force on the cylindrical stationary cam thereby forcing the rotor to rotate. 
         [0018]    4. engine shaft, consisting of a round shaft which passes through the center of the housing walls and extends out the center of the front and posterior walls, and has means for the rotor to be attached to the shaft. 
         [0019]    5. piston guide grove in the lower end of the piston and has means to fit over the shaft to prevent the piston from rotating 
         [0020]    6. piston rod guide, consisting of two solid plate on the end of the piston rod and extends to each side of the cam, and has means to prevent the piston from rotating. 
         [0021]    7. pressure gauge with means to regulate the pressure of the compressed gas before the gas enters the expansion chamber. 
         [0022]    8. air valve with means to control timing and volume of compressed air that enters the expansion chamber. 
         [0023]    9. Oil chamber with passages to lubricate the moving parts of the engine. 
         [0024]    The basic engine components of the engine of this invention may be used in this compressed gas rotary engine which contains one or more compression chambers. The basic engine components may vary in size based on the size of the engine but the basic shape of the engine components remains the same. 
         [0025]    The air valve to control the timing and volume of compressed gas may be of the mechanical type, magnetic type and electronic controlled type. A magnet may be attached to the shaft and the magnet waves are pickup by a pick-up coil and the magnet waves are magnified and utilized to open the air valve at the right time and for the desired length as illustrated in Blount&#39;s U.S. Pat. No. 5,734,943 and utilized in a fuel injection system. 
         [0026]    Any suitable compressed gaseous material may be utilized to power the rotary engine of this invention but not limited to helium, hydrogen, nitrogen and air. Compressed air is the preferred gas. The gas may be compressed to 100 psi to 6000 psi or higher depending on the strength of the tank and the protection around the tank if it explodes. The pressure of the gas when it enters the cylinder chamber of this engine may be controlled by a pressure regulator. The amount of pressure of the gas entering the compression chamber will depend on the size of the engine, strength of the material of the engine and the rotors revolution desired. The amount of compressed gas that enters the cylinder chamber may be regulated by an air valve which controls the length of time that the gas is entering the cylinder chamber which allows the compressed gas to expand and exhaust at a lower psi thereby using less compressed gas. The expanded gas may be captured and kept to be re-compressed for further use. 
     
    
     
       DESCRIPTION OF THE DRAWINGS 
         [0027]    Other object of the invention will become apparent upon reading the annexed detail description in connection with the drawing in which: 
           [0028]      FIG. 1  is a cross sectional view of a 1 cylinder chamber, 1 piston, compressed gas rotary engine. 
           [0029]      FIG. 2  is a sectional view of a 1 cylinder chamber, 1 piston, compressed gas rotary engine with a magnetic pick-up coil. 
           [0030]      FIG. 3  is an exterior view of a 1 cylinder chamber, 1 piston, compressed gas rotary engine. 
           [0031]      FIG. 4  is a cross sectional view of a 2 cylinder chambers, 2 piston compressed gas rotary engine. 
           [0032]      FIG. 5  is a sectional view of a 2 cylinder chambers, 2 piston, compressed gas rotary engine. 
           [0033]      FIG. 6  is an external view of a 2 cylinder chambers, 2 piston, compressed gas rotary engine with a mechanical air valve. 
           [0034]      FIG. 7  is a cross sectional view of a 4 cylinder chambers, 4 piston, compressed gas rotary engine. 
           [0035]      FIG. 8  is a sectional view of a 4 cylinder chamber, 4 piston, compressed gas rotary engine. 
           [0036]      FIG. 9  is a plan exterior view of a 4 cylinder chambers, 4 piston, compressed gas rotary engine with a magnetic pick-up coil, magnetic air valve and a pressure regulator. 
           [0037]      FIG. 10  is a plan exterior view of a rotor for this compressed gas rotary engine with cylinder chamber which can be utilized for one or two pistons. 
           [0038]      FIG. 11  is a plan exterior side view of the rotor for this compressed gas rotary engine showing the seals and piston guides. 
           [0039]      FIG. 12  is a plan exterior view of the piston for this compressed gas rotary engine showing the rings and piston guide slots. 
           [0040]      FIG. 13  is a plan exterior under view of the piston for this compressed gas rotary engine showing the bearing and piston guides. 
           [0041]      FIG. 14  is a plan exterior front view of the cam for this compressed gas rotary engine with its stationary attachment and hole for the shaft. 
           [0042]      FIG. 15  is a plan side view of the cam for this compressed gas rotary engine. 
           [0043]      FIG. 16  is a plan view of the front of the cam stationary attachment to the front side panel of this compressed gas rotary engine. 
           [0044]      FIG. 17  is a side view of the stationary cam attachment to the cam and front side panel of this compressed gas rotary engine. 
           [0045]      FIG. 18  is a plan sectional view of the mechanical air valve showing the valve cam and the air valve for this two cylinder compressed gas rotary engine. 
           [0046]      FIG. 19  is a plan cross sectional view of the mechanical air valve showing the valve cam and the air valve for this two cylinder compressed gas rotary engine. 
           [0047]      FIG. 20  is a plan sectional view of the mechanical air valve showing the valve cam and the air valve for a one cylinder compressed gas rotary engine. 
           [0048]      FIG. 21  is a plan cross sectional view of the mechanical air valve showing the valve cam and air valve for a one cylinder compressed gas rotary engine. 
           [0049]      FIG. 22  is a plan cross sectional view of a 2 cylinder, 2 piston compressed gas rotary engine with a mechanical air valve. 
           [0050]      FIG. 23  is a plan sectional view of a double compressed gas rotary engine each containing 2 cylinder chambers. 
       
    
    
     DESCRIPTION OF PREFERRED EMBODIMENT 
       [0051]    Referring to the drawings and in particular to  FIG. 1 , the compressed gas rotary engine with a reciprocal piston of the present invention includes a circular engine housing  1  which has a front side wall  22  and a rear side wall  21  attached to the housing  1  by bolts. The round engine shaft  11  extends out through the center of the front and rear side walls  22 ,  21  and is attached to the posterior rotor wall  21 . The engine housing  1  of the compressed gas rotary engine has  2  exhaust ports  3  at about 225 degrees and 255 degrees and a compression air intake port  2 , The stationary circular housing  1  contains a circular rotor  4  which rotates with the shaft  11  and it has a circular cylinder chamber  12  which is also the expansion chamber, seals  8  and which are also oil seals  8 . Within the rotors cylinder chamber  12  is a circular piston  5  which reciprocates in the cylinder chamber  12  and rotates with the rotor  4 . The peripheral area of the piston  5  has rings  9  to seal off the cylinder chamber  12  from the oil in the central chamber  13  and the central chamber  32 . The piston  5  has a piston rod  31  which is also the piston guide  7  holds the bearing  6  and the piston guide rod extends on each side of the cam  10  to guide the piston around the cam  10  along with slots  7  in the bottom of the pistons which fits around the shaft  11  thereby preventing the piston  5  from rotating. The bearing  6  is held in place by a pin. The rod bearing  6  travels over a stationary round shape cam  10  and the inner rod guide  7  fits on each side of the cam  10  thereby guiding the reciprocal motion of the piston  5 . Referring to  FIG. 2  the compressed gas rotary engine is similar to  FIG. 1  except that it also has a timing pulley  25  on the shaft  11  in front of the front wall  22  and above the timing pulley  25  there is a pick-up coil  23  for magnetic waves and it is attached to the front wall  22 .  FIG. 3  is the exterior plan for  FIGS. 1 and 2  also has a timing pulley  25  attached to the shaft  11  in front, a magnetic pick-up coil  23  attached to the front wall  22 , a magnetic air valve  17  attached to the compression gas intake  2  and a pressure regulator  19  attached to the magnetic air valve  17 . 
         [0052]      FIG. 4 ,  FIG. 5  and  FIG. 6  which are plan of a compressed gas rotary engine with  2  cylinder chambers and 2 pistons  5  and they are similar to  FIG. 1  except that the rotatable rotor  4  has two cylinder chambers  12  opposite each other and has two pistons  5  which has rings  9  and seals  8  on the rotor  4  to seal off the piston chambers  12  from oil in the central chamber  32  and to prevent the loss of compressed gas. The reciprocal motion of the pistons  5  in the cylinder chambers  12  are guided by the cam  11  and by piston guides  7  on the end of the piston rod  31 , by slots  7  in the bottom of the piston  5  and by attaching the pistons  5  together with fasteners  14  which are attached to the bottom of the pistons  5  which keeps the two pistons  5  bearings  6  against the cam  10 .  FIG. 6  is a plan exterior of the compressed gas rotary engine of  FIG. 4  And  FIG. 5  which has a mechanical air valve  27  attached to the shaft in front of the engine with a pipe connected to the compressed gas intake  2  and a pressure gauge  19  to control the compressed gas pressure. 
         [0053]    Referring  FIG. 7 ,  FIG. 8  and  FIG. 9  which are plan drawings of a four cylinder compressed gas rotary engine of this invention which is similar to  FIG. 4  except that the rotatable rotor  4  has cylinder chambers  12  at 90 degrees from each other and each piston  5  in the cylinder chambers  12  has rings  9  and rotor has seals  8  on the rotor  4  to seal off the central chamber and the oil  13  in the central chamber and to prevent the loss of compressed gas. The rotor has seals to seal off one cylinder chamber for another cylinder chamber, The reciprocal motion of the pistons  5  in the cylinder chambers  12  is guided by the piston guides  7  on the end of the piston rod  31  the slots  7 in the lower end of the piston and by the stationary round cam  10 . The pistons  5  has a bearing  6  in the piston rod  31  which rotates on the stationary cam  10 . The housing has a pressure gauge  19  attached to the compressed gas intake  2  and has two exhausts  3 .  FIG. 8  is plan sectional view of the 4 cylinder compressed gas rotary engine of this invention which has a stationary cam attachment  20  which is attached to the front wall  22  and has an attachment to the cam  10  and the rotor  4  has an attachment to the shaft  11  so that the rotor  4  will rotate with the shaft  11 .  FIG. 9  is an exterior view of the 4 cylinder compressed gas rotary engine of this invention wherein the housing  1  has a pressure regulator  19  and an electronic magnet air valve  18  attached to the compressed gas intake  2  and two exhaust ports  3  and a magnetic wave pick-up coil which pick up the magnetic wave from the magnet  24  on timing pulley  25  which is attached to the front end of the shaft  11 . The shaft  11  extends out the front and back walls centrally and has bearings  6  on the front wall  22  and back wall  21 . 
         [0054]      FIG. 10  thru  FIG. 17  are plan views of the parts of this compressed gas rotary engine of this invention.  FIG. 10  is an exterior view of the rotor  4  which is round and has seals and an open on top and bottom for the cylinder chambers  12 .  FIG. 11  is an external view of the side of the rotor  4  showing the seal  8  and holes to the oil chamber  13 .  FIG. 12  is and external view of the round piston  5  showing the ring  9  grooves and the piston guide  7  slot.  FIG. 13  is a plan view of the bottom of the piston  5  and showing the piston rod  31  containing the piston guide  7  on the end of the piston rod, the piston guides  7  on the sides of the piston  5  and the bearing  6  in the center of the piston rod  31 .  FIG. 14  is a plan view of the front of the round cam  10  containing a slot for the cam&#39;s stationary attachment  20  and a hole for the shaft  11  to pass thru.  FIG. 15  is the side view of the round stationary cam  10 .  FIG. 16  is a view of the end of the cam&#39;s stationary attachment  20  where it attaches to the front wall  22  and cam  10  contains a slot for the bearing  6  and has a hole for the shaft  11  to pass through.  FIG. 17  is an external side view of the cam&#39;s stationary attachment  20  which is made into two parts to be able to remove the stationary cam  10 . 
         [0055]      FIG. 18  thru  FIG. 21  are plan views of mechanical air valves.  FIG. 18  is a plan sectional of a mechanical air valve illustrating the air valve  17 , the spring  29  to close the air valve  17  and the air valve cam  28  opens and closes the air valve and is shaped for opening and closing the air valve twice per revolution. The air valve cam is attached to the shaft  11 .  FIG. 19  is a plan of a cross sectional view of an air valve for a two cylinder pressure gas rotary engine showing the compressed gas flow, the gas valve  17 , the spring  29  for closing the air valve, the air valve cam which connected to the shaft  11  and rotates with the shaft.  FIG. 20  is a plan sectional air valve for a one cylinder compressed gas rotary engine illustrating the air flow, showing the air valve  17 , the spring  29  to close the air valve, the air valve cam  28  which is attached to the shaft  11 .  FIG. 21  is a plan cross sectional view of an air valve for a one cylinder compressed gas rotary engine showing the gas flow, the air valve  17 , the spring  29  for closing the air valve, the air valve cam  28  which opens the air valve one time per rotation for a one cylinder compressed gas rotary engine and the air valve cam  28  is connected to the shaft  11 .  FIG. 22  is a cross section of a 2 cylinder chambers  12 , 2 piston  5  in a rotor  4  which rotates inside the stationary housing  1 , the housing  1  has a mechanical air valve attached to the compressed gas intake  2  which opens and closes by rotation of the rotor  4  and slot in the piston  5 .  FIG. 22  pistons  5  has rings for sealing the piston from the central chamber  32  an the rotor has seals  8  to seal the cylinder chambers from the other cylinder chambers  12  and the central chamber  32  and the piston  5  has a piston rod  31  which contains a bearing  6  and piston guides  7 . The piston&#39;s bearing  6  is against the stationary cam  10  which is attached to cam stationary attachment which passes thru the center and front wall of the rotor  4  and is attached to the anterior wall  22  of the housing  1 . 
         [0056]      FIG. 23  is a plan view of a double 2 cylinder compressed gas rotary engine which are two compressed gas 2 cylinder engines that is contained in the same housing  1  and has a posterior wall  21  separating the two engines. The two engine has the same parts and function the same as the engine of FIGS.  4 , 5  and  6 . The cylinder chambers  12  with the minimum volume and with the piston  5  is under the compressed gas intake  2  are filled with compressed gas at the same time. The cylinder chambers  12  with the maximum volume is over the exhaust ports  3  and the expanded gas is exhausted at the same time. The double engines may be modified wherein one of the engines may be rotated so that the intake port  2  at a different location such as being rotated 90 degrees clockwise and the second engine has a minimum volume at 90 degrees. The rotated second engine power stroke would start when the first engine&#39;s power stroke was half way finished. 
       Operation  
       [0057]    The one cylinder chamber compressed gas rotary engine of  FIGS. 1 ,  2  and  3  operates with the rotor  4  rotating in the clockwise direction and starting from the position of the rotor  4  and piston  5  illustrated in  FIG. 1  is in a position wherein the cylinder chamber is at its minimum volume, then the shaft  11  and rotor  4  with it&#39;s piston  5  are rotated clockwise 180 degrees by means of compressed gas through compressed air intake port  2  into the compressed gas expansion stroke and then rotates 180 degrees thru the exhaust stroke to push out the remaining gas thru the exhaust ports in the housing  1  and rotates back to the compressed gas intake port. The rotor  4  is attached to the shaft  11  by means of a rotor stationary attachment  26  and rotates in the stationary housing  1  by means of compressed gas which enters the compression gas intake port  2  thereby putting pressure against the piston  5  in the rotor  4  which expands the cylinder&#39;s expansion space thereby putting a force against the round stationary eccentric cam  10  by means of a bearing  6  which is attached to the piston rod  31  and this force creates a rotary motion on the rotor  4  and shaft  11 . The piston&#39;s  5  bearing  6  is guided around the stationary cam  10  by means of a piston guide  7  on the lower end of the piston rod  31  and two groves in the bottom of the piston  7  straddle the shaft in front and in back thereby preventing the piston from rotating. The rotor  4  with the piston  5  acts as a fly wheel.  FIG. 3  illustrates using a timing pulley  25  containing a magnet attached to the front of the shaft  11 , a magnet pick-up waves which controls the magnet valve  18  opening and the duration that it stays open also there is a pressure regulator  19  to adjust the compressed gas pressure. The compressed gas is confined to the cylinder chamber (expansion chamber)  12  by means of seals  8  on the rotor  4  and rings  9  on the piston. The compressed gas valve  17  may also be controlled by means of a mechanical gas valve, electronic controlled gas valve or by means of confining the pressured gas in the area of the cylinder chamber  12  by means of seals  8  on the rotor and rings on the piston. The moving parts in this compressed gas rotary engine is lubricated by means of lubricant in the central chamber  32  and by means of lubricant passages  13  to the moving parts. 
         [0058]      FIGS. 4 ,  5  and  6  are plan views of a two piston compressed gas rotary engine which functions similar to the compressed gas rotary engine of  FIGS. 1 ,  2  and  3 .  FIG. 3  which is a plan cross sectional view of the compressed air rotary engine of this invention containing two cylinder chambers  12  with 2 pistons  5  and when the upper piston cylinder  12  is at it minimum volume and is under the compressed gas intake  2  the second cylinder chamber  12  volume is at it maximum and the expanded gas is being exhausted thru the exhaust port  3 . When the cylinder volume is at its minimum and the piston is under the compressed gas intake  3  compressed gas enters pressure regulator  19  then passes thru the timed air valve  26 , which is attached to the anterior portion of the shaft, into the cylinder chamber  12  thereby putting a pressure on the top of the piston  5  which pushes against the piston bearing  6  which pushes against the round stationary cam  10  thereby producing a rotary force on the rotor  4  which contains the pistons  5  in the cylinder chamber  12  and the rotor  4  is attached to the shaft  11  which rotates with the rotor  4  inside the housing  1  and the shaft  11  and rotor  4  is rotated 180 degrees then rotated pass the exhaust port exhausting the expanded gas and the chamber volume is decreased to its minimum volume by the means of the eccentric stationary cam  10  creating a force on the piston&#39;s bearing  6  as it rotates 180 degrees back to under the compressed gas intake port. The shaft  11  extends thru the posterior wall  21  and anterior wall  22  of this compressed air rotary engine. As the rotor  4  rotates the gas in the second cylinder chamber  12  is exhausted thru the exhaust ports  3  and the cylinder chamber&#39;s volume is minimized by means of the stationary cam  10  which by it&#39;s shape pushes the against the piston&#39;s bearing  6  forcing the piston toward the housing  1  thereby reducing expansion chamber  12  which is under the compressed gas intake and compressed air enters the cylinder chamber  12  and another rotation starts. The first cylinder  12  is rotated by the rotary force of the second piston and exhausts the spent gas in the cylinder while turning another 180 degree to where it is under the compressed gas intake port  2  and the air control valve  17  is opened and the compressed gas enters the cylinder chamber  12  starting another revolution cycle. 
         [0059]      FIGS. 7 ,  8  and  9  are plan views of a 4 cylinder compressed gas rotary engine of this invention is powered by compressed gas and the cylinder chamber  12  with the minimum volume is under the compressed gas intake port, the next cylinder chamber  12  which is at 90 degrees from the cylinder chamber  12  with the minimum volume has a cylinder volume of 50% more then the minimum volume the next cylinder chamber which is 180 degrees from the minimum volume cylinder chamber  12  contains the maximum volume and the next cylinder chamber which is 270 degrees from the minimum volume cylinder chamber  12  has a cylinder chamber  12  volume of 50% more than the minimum volume cylinder chamber  12 . The rotor  4  and shaft  11  rotates in the stationary housing  1  by means of compressed gas that passed thru a pressure regulator into a controlled gas valve and enters the cylinder chamber  12  with the minimum volume. This pressured gas in the cylinder chamber  12  puts a pressure force on the piston  5  and the piston bearing  6  which pushes against the stationary cam  10  creating a rotary force on the rotor  4  which is attached to the shaft  11  which rotates 180 degrees and the expanded gas is exhausted thru the exhaust ports  3  and the cylinder chamber volume is decreased by means of the piston bearing  6  against and rotating around the stationary eccentric round cam  10  and by expanding gas in another cylinder chamber  12  and centrifugal force. When the rotor rotates 90 degree another cylinder chamber  12  with a minimum volume is rotated to under the compressed gas intake port  2  and the air valve  19  is opened and the compressed air enters the cylinder chamber  12  thereby putting a pressure force on the piston  5  and the piston&#39;s bearing  6  which pushes against the stationary cam  10  creating a rotary force on the rotor  4  which rotates the rotor  4  and shaft  11  for 180 degrees then the expanded gas exhausted thru the exhaust ports  3 . The cylinder with the expanded gas is further rotated by the force of expanding gas in the other two cylinder chambers  12  and the cylinder chamber&#39;s  12  volume is decreasing in the other two cylinder chambers  12  which is produced by the force of the piston&#39;s bearing against the eccentric round stationary cam  10  thereby forcing out the expanded gas thru the exhaust ports  3 . There are  4  compressed gas power stroke per revolution of the rotor  4 . 
         [0060]      FIG. 23  is a plan sectional view of a double compressed gas rotary engine wherein each engine contains two cylinder chambers  12  which has the same parts and function the same at the same time. Both engines cylinder chambers with the minimum cylinder chamber  12  volume are under the compressed gas intake  2  and both cylinder chambers are filled with compressed gas at the same time. The engine&#39;s cylinder chamber  12  with the maximum volume is under the exhaust port  3  and is exhausting the expanded gas at the same time. Both engines function the same as the compressed gas rotary engine in FIGS.  4 , 5  and  6 . This double engine may be modified wherein one of the engine may be rotated so that the intake port  3  with the minimum volume cylinder chamber  12  under it may be located different from the other engine such as being rotated 90 degree clockwise then the rotated engine&#39;s power stroke starts when the other engine&#39;s compressed gas in the power stroke has increased in volume by 50% and rotated 90 degrees. Two compressed gas rotary engine may just be attached together by means of connecting the shafts  11  together. 
         [0061]    It will be understood that various changes and modifications may be made in the constructions described which provide the characteristics of this invention without departing from the spirit thereof particularly as defined in the following Claims.