Powder-Metallurgically Produced Piston Body Comprising Support Webs

Abstract

A powder-metallurgically produced piston body for a piston-cylinder arrangement, in particular a shock absorber piston, has a one-part piston body, a revolving or circumferential web that protrudes radially outwardly from outer surface of the piston body, longitudinal webs, and at least one traverse groove. A collar-shaped seal, made of thermally deformable material, is formed onto the piston body such that the revolving or circumferential web and the support webs are formed into the seal over at least a part of their heights.

1 . A powder-metallurgically produced piston body for a piston-cylinder arrangement, in particular a shock absorber piston, having a one-part piston body that is provided on its peripheral surface in an area adjacent to a terminal piston area, with a revolving web that protrudes beyond the peripheral surface, to which longitudinal support webs are adjacent that extend to the other terminal piston area and that are disposed parallel to and at a distance from each other, at least a part of said support webs being provided with at least one transverse groove between the two terminal piston areas, each pair of adjacent support webs delimiting a groove-shaped recess, the ends opposite the revolving web of said recesses being open in the longitudinal direction, a collar-shaped seal made of a thermally deformable sealing material being able to be formed onto the piston body in such a way that both the revolving web and also the support webs are formed into the material of the collar-shaped seal at least over a part of their vertical direction. 
   
   
       2 . The piston body according to  claim 1 , wherein the depth of the groove-shaped recesses is less at an area adjacent to the revolving web than in the area of the final area opposite the revolving web. 
   
   
       3 . The piston body according to  claim 1 , wherein at least two transverse grooves are provided. 
   
   
       4 . The piston body according to  claim 1 , wherein the at least one transverse groove has a depth less than that of the groove-shaped recess. 
   
   
       5 . The piston body according to  claim 1 , wherein a collar-shaped seal made of a thermally deformable plastic, preferably PTFE, is formed onto the piston body by means of thermal deformation in such a way that the seal does not completely fill the groove-shaped recess and does completely fill the transverse grooves. 
   
   
       6 . A shock-absorber comprising: a one-part piston body having through openings formed therein and including: an outer surface that includes a first terminal portion and an opposing second terminal portion; a circumferential web, adjacent to the first terminal portion, protruding radially beyond the outer surface; longitudinal support webs, adjacent the circumferential web, extending between the first and second terminal portions, the support webs delimiting recesses that are open on their ends opposite the support web; at least a portion of the support webs providing at least one transverse groove disposed between the first and second terminal portions a collar-shaped seal formed of a thermally deformable sealing material, the seal being formed to a portion of the piston body such that a least a portion of the circumferential web and at least a portion of the support webs are impressed into the seal; and a cylinder in which the piston body is moveably disposed. 
   
   
       7 . The shock absorber according to  claim 6 , wherein the support webs are mutually spaced apart and disposed mutually parallel, and each pair of adjacent support webs delimit a recess. 
   
   
       8 . The shock absorber according to  claim 7  wherein the recesses are groove-shaped. 
   
   
       9 . The shock absorber according to  claim 8 , wherein depths of the groove-shaped recesses are less adjacent to the circumferential web than near the second terminal portion. 
   
   
       10 . The shock absorber according to  claim 8 , wherein the at least one transverse groove has a depth less than a depth of the groove-shaped recess. 
   
   
       11 . The shock absorber according to  claim 6 , wherein the support webs provide least two of said transverse grooves. 
   
   
       12 . The shock absorber according to  claim 6 , wherein the collar-shaped seal is formed of a thermally deformable plastic, said seal being formed onto the piston body by thermal deformation such that the seal does not completely fill the groove-shaped recesses and does completely fill the transverse grooves. 
   
   
       13 . The shock absorber according to  claim 12 , wherein the plastic is PTFE.