Engine having rotary pistons

Abstract

The present invention relates to a mechanism ( 1 ) having rotary pistons ( 21 ), said mechanism comprising an outer enclosure ( 2 ) forming a stator in which a rotary assembly ( 20 ) forming a rotor moves, the rotary assembly ( 20 ) including: a plurality of pistons ( 21 ) forming a hinged polygon, each piston ( 21 ) defining a positive-displacement chamber ( 35 ) with the enclosure ( 2 ), and first guide ( 27, 27 a, 27 b ) that are arranged so as to engage with second guide means ( 7 a, 7 b ) comprising rolling surfaces ( 10 a, 10 b ) so as to drive the polygon to carry out a predetermined movement, the mechanism ( 1 ) being characterized in that it comprises a drawback device ( 50 ) that maintains contact between the guide means ( 27, 27 a, 27 b ) and the rolling surfaces ( 10 a, 10 b ). The invention also relates to an engine and a pump including such a mechanism ( 1 ).

1 . A rotary piston mechanism comprising;
 an outer enclosure forming a stator inside which a rotary assembly forming a rotor moves, the rotary assembly comprising:
 a plurality of pistons forming an articulated polygon, each piston delimiting a volume chamber with the enclosure, and 
 first guide means arranged to cooperate with second guide means comprising rolling surfaces, so as to stress the polygon to perform a predetermined movement, and 
   wherein the mechanism comprises a return device maintaining contact between the guide means and the rolling surfaces.   
     
     
         2 . The mechanism according to  claim 1 , wherein the return device is supported by the rotary assembly. 
     
     
         3 . The mechanism according to  claim 1 , wherein the return device comprises a plurality of dampers positioned between a stationary point of each piston and a movable fastening point of each of the first guide means comprising a guide roller axis of rotation. 
     
     
         4 . The mechanism according to  claim 1 , wherein the return device is supported by the outer enclosure. 
     
     
         5 . The mechanism according to  claim 1 , wherein the second guide means are supported by lateral flanges positioned coaxially to the outer enclosure and serving to close the latter part. 
     
     
         6 . The mechanism according to  claim 1 , wherein the second guide means comprise two sectors, a first of which is secured to the stator enclosure and a second of which is translationally movable relative to the first, a return device being positioned between a stationary point of the first sector and a movable point of the second sector of each of the second guide means. 
     
     
         7 . The mechanism according to  claim 1 , wherein a segment support device is pivotably mounted along a single axis on each apice of the polygon. 
     
     
         8 . The mechanism according to  claim 7 , wherein the segment support device comprises a device for pressing segments on the stator enclosure. 
     
     
         9 . The mechanism according to  claim 7 , wherein the segment support device comprises a complementary device for pressing segments on the stator. 
     
     
         10 . The mechanism according to  claim 1 , wherein at least one piston is connected by a single connecting rod or by several connecting rods having same hinge pins as the transmission shaft. 
     
     
         11 . The mechanism according to  claim 1 , wherein two adjacent pistons are connected to one another by a pivot link with an axis parallel to an axis of rotation of the rotary assembly. 
     
     
         12 . The mechanism according to  claim 1 , wherein the second guide means are turned toward a axis of rotation of the rotary assembly. 
     
     
         13 . The mechanism according to  claim 1 , wherein the rotary assembly comprises a lubrication circuit mounted in a closed circuit. 
     
     
         14 . A pump comprising a mechanism according to  claim 1 . 
     
     
         15 . An engine comprising a mechanism according to  claim 1 .