Cylinder apparatus including plated component and manufacturing method thereof
AssigneeHitachi Automotive Systems, Ltd.
InventorsYuichi Kobayashi, Takeshi Murakami
Life of this patent
Estimating the term…
Abstract
A steel base material (11) is subjected to a quenching step, a machining step, a plating step, and a tempering step to form a rod (4). In the quenching step, two axially spaced portions of the steel base material are quenched to form quenched portions (12 and 13). In the machining step, plastic working or cutting is performed on a portion of the steel base material between the two quenched portions to form a full-circumferential groove (4C1) in a machined portion 4C. In the plating step, the quenched portion (12) is not plated, but a region of the steel base material including the quenched portion (13) is plated to form a coating layer (16). In the tempering step, the quenched portions are tempered.
Claims15
A cylinder apparatus comprising a cylinder having a hydraulic fluid sealed therein, a piston axially slidably fitted in the cylinder, and a rod, a first axial end of the rod being connected to the piston and a second axial end of the rod extending to an outside of the cylinder, the rod being a plated component obtained by plating one of a steel bar and a steel pipe, and the plated component comprising:
- a plated portion having been subjected to quenching and plating;
- a non-plated portion provided at a position axially different from the plated portion, the non-plated portion having been subjected to quenching and not subjected to plating;
- and
- a machined portion provided between the plated portion and the non-plated portion, the machined portion having been subjected to one of plastic working and cutting and not subjected to either of quenching and plating.
Dependencies are inferred from the claim text.