Rotary fluid motor

Abstract

A fluid motor having a fixed cylindrical casing, supporting a rotor having an output shaft extending rotatably and coaxially in the casing. The rotor includes piston chambers and reciprocable pistons in the piston chamber. A piston rod of each piston is connected to a crankshaft connected to the rotor for rotation therewith. The casing has inlet and outlet ports communicating with the piston chambers during rotation of the rotor to admit compressed fluid through the inlet-port and discharge from the outlet-port. A drive train synchronizes rotation of the crankshafts and the output shaft, a gear tooth ratio of an annular gear to pinion gears on the crankshafts is preferably twice the number of pistons in each rotor block.

1 . A rotary fluid motor comprising: 
 a fixed cylindrical casing,    a rotor in said casing, said rotor having an output shaft extending rotatably and co-axially in said casing, said rotor including a plurality of piston chambers and respective pistons in said piston chambers, said pistons being reciprocable in said chambers along lines spaced radially from an axis of rotation of said output shaft and said pistons each having a piston rod connected to a crankshaft connected to said rotor for rotation therewith,    said casing having fluid inlet-ports and outlet-ports communicating with said piston chambers during rotation of said rotor to admit pressured-fluid through said inlet-port and discharge from outlet-port,    a valve member on said piston chamber to provide respective communication between said inlet and outlet ports and said piston chamber, said valve member having cylindrically shaped end corresponding to said cylindrical casing to close said ports when said valve member is closed,    a drive train synchronizing rotation of the said crankshaft and said output shaft, the gear teeth ratio of annular gear to pinion gear to be appropriate to engine efficiency preferably twice the number of pistons in each engine block, two, three, four, five, six piston engine shall be 4:1, 6:1, 8:1, 10:1, 12:1 respectively, and    said pistons undergoing reciprocal movement in said piston chambers in synchronism in which the pistons all have the same stroke position in said chambers.    
   
   
       2 . The rotary fluid motor of  claim 1 , wherein said rotor includes a plurality of blocks each including a plurality of said pistons and piston chambers.  
   
   
       3 . The rotary fluid motor of  claim 2 , wherein said piston chambers and said pistons are arranged in said blocks in pairs in opposition to one another.  
   
   
       4 . The rotary fluid motor of  claim 1 , comprising a crank arm connected to said rotor, said piston rods being connected to respective ends of said crank arm.  
   
   
       5 . The rotary fluid motor of  claim 2 , wherein each said block includes a mounting plate rotatably supporting one end of the crankshafts of the pistons in said block, and a middle mounting plate disposed between adjacent blocks to rotatably support opposite ends of the crankshafts of the pistons in the adjacent blocks.  
   
   
       6 . The rotary fluid motor of  claim 5 , wherein said valve casings are secured to said mounting plates.  
   
   
       7 . The rotary fluid motor of  claim 1 , wherein each piston has a curved end corresponding in shape to the cylindrical casing.