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US 2018/0023704 A1Published application
Cylinder, cylinder device, and working vehicle
AssigneeTadano Ltd.
InventorsKoji YAMAMOTO, Hiroki MIZOBUCHI
Life of this patent
Estimating the term…
Abstract
Provided is a hydraulic cylinder using oil pressure, etc., the hydraulic cylinder being configured so that the thickness of a head cover, etc. is reduced so that the hydraulic cylinder is lighter and has a small overall length. A head cover (3) which constitutes an end of a cylinder (1) and a cylinder tube (2) which constitutes the cylindrical portion of the cylinder (1) are welded together by a laser beam applied from the outside radially of the cylinder tube (2) toward the inside radially of the cylinder tube (2).
Claims8
1-7. (canceled)
A cylinder comprising:
- a cylinder tube;
- and
- a head cover having a flat circular shape including a small diameter portion and a large diameter portion, the small diameter portion having a diameter identical to an inner diameter of the cylinder tube, the large diameter portion having an diameter identical to an outer diameter of the cylinder tube, the head cover being fit and welded to the cylinder tube such that an outer peripheral surface of the small diameter portion faces an inner peripheral surface of the cylinder tube and that an annular plane of the large diameter portion faces an axial end surface of the cylinder tube, wherein:
- a melting portion of the head cover welded to the cylinder tube extends toward a center of the circular shape from the annular plane of the large diameter portion making contact with the axial end surface of the cylinder tube up to a portion on an inside relative to the outer peripheral surface of the small diameter portion, and
- a heat-affected portion affected by a heat of laser irradiation is formed at an inner end portion of the melting portion.
2 more elements
Dependencies are inferred from the claim text.