Shock absorber with welded piston

Claim 2

A combination piston and piston rod assembly for use in a double direct-acting hydraulic shock absorber of the type including a pressure cylinder filled with oil comprising: a hollow piston member having a base portion and an open ended flange portion thereon, said base portion having a closed center weld surface thereon, an annular dam surrounding said closed center surface, a piston rod having a tip welded in fused relationship with said piston on the closed center weld surface, a plurality of flow openings directed through said base into the interior of said hollow piston, said annular dam defining a barrier between weld material at said piston rod and said openings, each of said openings being inclined with respect to the longitudinal axis of said piston rod and serving to direct oil from the rod side of said piston in a converging direction into the center interior of said piston, means including an inclined internal surface forming a control chamber within said piston adjacent the base portion thereof, said openings intersecting with said inclined surface to afford an unrestricted flow path into said control chamber, an orifice plate located within said control chamber, a first valving element on one side of said orifice plate, a spring for maintaining said first valving element closed during a first movement of the piston and piston rod, an annular support shoulder in said piston at a point radially outward of said chamber, a second valving element on the opposite side of said orifice plate and spring means on said support shoulder for maintaining said second valving element closed during an opposite movement of said pIston and said piston rod, said spring means and said second valving element being located by said shoulder radially outwardly of said control chamber away from fluid flow centrally therethrough, said orifice plate including a first and second plurality of openings therein each freely communicating with said open control chamber for allowing flow of fluid from said control chamber to opposite sides of said orifice plate within said hollow piston.

Claim 3

A combination piston and piston rod assembly for use in a double direct-acting hydraulic shock absorber of the type including a pressure cylinder filled with oil comprising: a hollow piston member having a base portion and an open ended flange portion thereon, said base portion having a closed center weld surface thereon, an annular dam surrounding said closed center surface, a piston rod having a top welded in fused relationship with said piston on the closed center weld surface, a plurality of flow openings directed through said base into the interior of said hollow piston, said annular dam defining a barrier between said weld material at said piston rod and said openings, each of said openings being inclined with respect to the longitudinal axis of said piston rod and serving to direct oil from the rod side of said piston in a converging direction into the center interior of said piston, means including an inclined internal surface forming a control chamber within said piston adjacent the base portion thereof, said openings intersecting with said inclined surface to afford an unrestricted flow path into said control chamber, an annular support shoulder in said piston at a point radially outward of said chamber, an orifice plate located within said control chamber, a first valving element on one side of said orifice plate, a spring for maintaining said first valving element closed during a first movement of the piston and piston rod, a second valving element on the opposite side of said orifice plate and spring means on said support shoulder for maintaining said second valving element closed during an opposite movement of said piston and said piston rod, said spring means and said second valving element being located by said shoulder radially outwardly of said control chamber away from fluid flow centrally therethrough, said orifice plate including a first and second plurality of openings therein each freely communicating with said open control chamber for allowing flow of fluid from said control chamber to opposite sides of said orifice plate within said hollow piston, an inclined outer surface on said piston formed continuously around said piston, said flow openings being directed through said outer inclined surface to locate the entrance to the openings on the rod side of the piston away from interferring fluid flow relationship with the outer surface of said piston rod at the point it is welded to said base portion.

Claim 4

A combination piston and piston rod assembly for use in a double direct-acting hydraulic shock absorber of the type including a pressure cylinder filled with oil comprising: a hollow piston member having a base portion and an open ended flange portion thereon, said base portion having a closed center weld surface thereon, an annular dam surrounding said closed center surface, a piston rod having a top welded in fused relationship with said piston on the closed center weld surface, a plurality of flow openings directed through said base into the interior of said hollow piston, said annular dam defining a barrier between said weld material at said piston rod and said openings, each of said openings being inclined with respect to the longitudinal axis of said piston rod and serving to direct oil from the rod side of said piston in a converging direction into the center interior of said piston, means including an inclined internal surface forming a control chamber within said piston adjacent the base portion thereof, said openings intersecting with said inclined surface to afford an unrestricted flow path into said control chamber, an annular support shoulder in said piston at a point radially outward of said chamber, an orifice plate located within said control chamber, a first valving element on one side of said orifice plate, a spring for maintaining said first valving element closed during a first movement of the piston and piston rod, a second valving element on the opposite side of said orifice plate and spring means on said support shoulder for maintaining said second valving element closed during an opposite movement of said piston and said piston rod, said spring means and said second valving element being located by said shoulder radially outwardly of said control chamber away from fluid flow centrally therethrough, said orifice plate including a first and second plurality of openings therein each freely communicating with said open control chamber for allowing flow of fluid from said control chamber to opposite sides of said orifice plate within said hollow piston, an inclined outer surface on said piston formed continuously around said piston, said flow openings being directed through said outer inclined surface to locate the entrance to the openings on the rod side of the piston away from interferring fluid flow relationship with the outer surface of said piston rod at the point it is welded to said base portion.