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US 11,913,478 B2Granted
Piston unit of a working cylinder
AssigneeBuemach Engineering International B.V.
InventorJosef Bueter
Life of this patent
Estimating the term…
Abstract
A piston unit of a working cylinder includes a piston and a piston rod. The piston has an axial bore hole formed therein. The piston rod is received in the axial bore hole. The piston rod and the piston are connected by a material-bond by a circumferential laser ring weld seam. The laser ring weld seam defines a pressure medium-tight sealing plane.
Claims1
A piston unit of a working cylinder, comprising:
- a piston and a piston rod, said piston having an axial bore hole formed therein, said piston rod having a chromium-plated outer lateral surface, said piston rod being received in said axial bore hole, said piston rod and said piston being connected with a material-bond by a circumferential laser ring weld seam, said laser ring weld seam defining a pressure medium-tight sealing plane;
- and
- said outer lateral surface having a non-chromium-plated cross-sectionally reduced annular section, an annular compensation layer arranged between said piston and said cross-sectionally reduced annular section, said laser weld ring seam including a radial inner laser ring weld seam connecting said piston rod to said annular compensation layer and a radial outer laser ring weld seam connecting said annular compensation layer to said piston.
Dependencies are inferred from the claim text.