Joined body, method of manufacturing joined body, and shock absorber
AssigneeHitachi Astemo, Ltd.
InventorsMasato Higuma, Atsushi Koshizaka, Keiji Kawahara, Yu Ishimaru
Life of this patent
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Abstract
A first annular groove is filled with a material of a solenoid case and a first joined portion is formed after a second annular groove is filled with the material of the solenoid case and a second joined portion is formed. This allows a load applied to a piston rod when the material of the solenoid case flows into the first annular groove to be partially received by the second joined portion, thereby contributing to reducing a reaction force received by the piston rod and thus preventing the deformation of an upper-end portion of the piston rod due to the reaction force received by the piston rod.
Claims6
A joined body of two members, the joined body comprising:
- a rod-like member;
- and
- a counterpart member,
- wherein the rod-like member and the counterpart member are joined by fitting a one-end portion of the rod-like member into a fitted hole of the counterpart member and pressing a material of the counterpart member to thus cause the material to plastically flow into a groove provided on a circumferential surface of the rod-like member,
- wherein the groove includes a first groove provided on a one-end side of the rod-like member and a second groove provided so as to be axially spaced apart from the first groove, and
- wherein a depth of the first groove is greater than a depth of the second groove.
A joined body of two members, the joined body comprising:
- a rod-like member;
- and
- a counterpart member,
- wherein the rod-like member and the counterpart member are joined by fitting a one-end portion of the rod-like member into a fitted hole of the counterpart member and pressing a material of the counterpart member to thus cause the material to plastically flow into a groove provided on a circumferential surface of the rod-like member,
- wherein the groove includes a plurality of first grooves provided on a one-end side of the rod-like member and a second groove provided so as to be axially spaced apart from the first grooves, the number of second groove(s) is smaller than the number of first grooves,
- wherein the counterpart member includes a first recessed portion formed near the first grooves by pressing a surface on one axial side, and a second recessed portion formed near the second groove by pressing a surface on an opposite axial side, and
- wherein a volume of the first recessed portion is greater than a volume of the second recessed portion.
A method of manufacturing a joined body of two members,
- the joined body including a rod-like member and a counterpart member,
- the rod-like member and the counterpart member being joined by fitting a one-end portion of the rod-like member into a fitted hole of the counterpart member and pressing a material of the counterpart member to thus cause the material to plastically flow into a groove provided on a circumferential surface of the rod-like member,
- the method of manufacturing the joined body comprising:
- a first plastic flow step of causing the material of the counterpart member to plastically flow into a second groove provided at a position spaced apart from one end of the rod-like member;
- and
- a second plastic flow step of causing the material of the counterpart member to plastically flow into a first groove including a groove deeper than the second groove provided on a one-end side of the rod-like member.
A shock absorber comprising:
- a cylinder sealingly containing hydraulic fluid therein;
- a piston mechanism partitioning an inside of the cylinder into two chambers;
- a piston rod having a one-end portion joined with the piston mechanism and an opposite-end portion extending out of the cylinder;
- and
- a joined portion formed by fitting the one-end portion of the piston rod into a fitted hole of the piston mechanism and pressing a material of the piston mechanism to thus cause the material to plastically flow into a groove provided on a circumferential surface of the piston rod,
- wherein the groove includes a first groove provided on a one-end side of the piston rod and a second groove provided so as to be axially spaced apart from the first groove, and
- wherein a depth of the first groove is greater than a depth of the second groove.
Dependencies are inferred from the claim text.