Oil control ring of ferrous body for internal combustion engines

Abstract

An oil control ring for internal combustion engines, formed by a ferrous body having two external contact surfaces where each surface contains first and second extremity edges, two tilted faces where each tilted face starts from the respective second edge, a peripheral transversal section directed at the cylinder wall and an internal circular section directed at the side of the piston, where the projections of contact are directed, so that the respective tilted faces are turned facing the other, symmetrically, in a preferred concretization. The ring allows the maintenance of appropriate levels of contact pressure, even under reduced expanding loadings due to the use of profile that brings reduced contact of the ring with the cylinder interface. Additionally, it brings better dynamic stability and consequent distribution of the contact pressure of the set. It also makes it possible to apply superficial hardening treatments on oil rings with reduced contact surface.

1 : Oil control ring ( 1 ) for internal combustion engines, formed by a ferrous body ( 12 ) including two projections of contact ( 2 ), each one defining a respective external contact surface which contains a first ( 22 ) and second ( 23 ) extremity edges and each one having a tilted face ( 3 ) which starts from the respective second edge ( 23 ), the ring ( 1 ) comprising the fact that the projections of contact ( 2 ) are directed, so that the respective tilted faces ( 3 ) are directed one facing the other, symmetrically. 
     
     
         2 : Ring according to  claim 1 , further comprising the fact that it includes an intermediate section ( 4 ) which has areas to drain oil in the form of oblong rips or holes ( 33 ) positioned in order to make the flow of lubricant possible. 
     
     
         3 : Ring according to  claim 1 , further comprising the fact that it includes a solid intermediary section ( 4 ), which does not have oblong rips or holes ( 33 ). 
     
     
         4 : Ring according to  claim 1 , further comprising the fact that the projections of contact ( 2 ) are created by means of the removal of material from the region between both. 
     
     
         5 : Ring according to  claim 1 , further comprising the fact that the projections of contact ( 2 ) are obtained through the use as an alternative form, of a pre-profiled tape for manufacturing of the ring ( 1 ). 
     
     
         6 : Ring according to  claim 1 , further comprising the fact that the face ( 102 ) is obtained through the use of pre-profiled tape for manufacturing of the ring ( 1 ). 
     
     
         7 : Ring according to  claim 1 , further comprising the fact that each face ( 102 ) is obtained through machining or similar process to remove material via pulling the material. 
     
     
         8 : Oil control ring ( 1 ) for internal combustion engines, formed by a ferrous body ( 12 ) including two projections of contact ( 2 ), each one defining a respective external contact surface which contains a first ( 22 ) and second ( 23 ) extremity edges and each one having a tilted face which ( 3 ) starts from the respective second edge ( 23 ), the ring ( 1 ) comprising the fact that each contact surface ( 102 ) has a height (H) between the first ( 22 ) and second ( 23 ) extremity edges between 0.02 and 0.20 millimeter and the angle of each tilted face ( 3 ) is included between 5 and 25 degrees. 
     
     
         9 : Ring according to  claim 8 , further comprising the fact that the projections of contact ( 2 ) are directed, so that the respective tilted faces ( 3 ) are turned one facing the other, symmetrically, the inferior one directed at the top of the piston. 
     
     
         10 : Ring, according to  claim 8 , further comprising the fact that the tilted faces ( 3 ) are included between 13 and 17 degrees. 
     
     
         11 : Ring according to  claim 8 , further comprising the fact that the projections of contact ( 2 ) are directed, so that the respective tilted faces ( 3 ) are turned to the same direction, the top of the piston. 
     
     
         12 : Ring according to  claim 8 , further comprising the fact that it includes an intermediary section ( 4 ) which has areas to drain oil in the form of oblong rips or holes ( 33 ) positioned in order to make the flow of lubricant possible. 
     
     
         13 : Ring according to  claim 8 , further comprising the fact that it includes a solid intermediary section ( 4 ), that is, it does not have oblong rips or holes ( 33 ). 
     
     
         14 : Ring according to  claim 8 , further comprising the fact that the projections of contact ( 2 ) are created by means of removing material from the region between both. 
     
     
         15 : Ring according to  claim 8 , further comprising the fact that the projections of contact ( 2 ) are obtained by the use as an alternative form of a preprofiled tape for manufacturing of the ring ( 1 ). 
     
     
         16 : Ring according to  claim 8 , further comprising the fact that the face ( 102 ) is obtained by the use of pre-profiled tape for manufacturing of the ring ( 1 ). 
     
     
         17 : Ring according to  claim 8 , further comprising the fact that each face ( 102 ) is obtained by machining or similar process to remove material by pulling the material. 
     
     
         18 : Ring according to  claim 1 , further comprising the fact that the external surface of the ring receives application of coatings in order to increase resistance to wearing of the ring ( 1 ). 
     
     
         19 : Ring according to  claim 1 , further comprising the fact that the external surface of the ring receives superficial treatment in order to increase resistance to wearing of the ring ( 1 ). 
     
     
         20 : Ring according to  claim 1 , further comprising the fact that the ferrous body ( 12 ) has total height (HT) above 2 millimeters (mm).