Tubular part
AssigneeDaicel Chemical Industries, Ltd.
InventorsHaruhiko Yamashita, Teruhiko Oshio
Life of this patent
Estimating the term…
Abstract
A tubular part for fixing and holding a fixing object part inserted therein, the fixing object part being fixed by inwardly crimping a circumferential wall on a side of one end opening of the tubular part, including: the tubular part having a chamfered corner on an inner peripheral side of the circumferential wall on the side of one end opening, a degree of chamfering being such that chamfering is performed between a point at a thickness T1 measured from an outer circumferential surface of the one end opening and a point at a length L1 measured from an end surface of the opening, and when a thickness of the circumferential wall of the opening is represented as T, (T−T1)/T being 0.05 to 0.9 and (T−T1)/L1 being 0.8 to 1.2.
Claims5
A tubular part for fixing and holding a fixing object part inserted therein, the fixing object part being fixed by inwardly crimping a circumferential wall on a side of one end opening of the tubular part,
- comprising:
- an annular step formed at an inner peripheral surface of the circumferential wall of the tubular part;
- a chamfered corner provided, prior to crimping, on the inner peripheral surface of the circumferential wall at the one end opening;
- a tapered portion formed, prior to crimping, on an outer peripheral surface of the circumferential wall at the one end opening;
- an inner annular surface provided in the fixing object part attached to the annular step;
- an outer annular surface provided in the fixing object opposite to the inner annular surface and opposing the one end opening;
- a degree of chamfering being such that chamfering is performed between a point at a thickness T1 measured from an outer circumferential surface of the one end opening and a point at a length L1 measured from an end surface of the opening, and when a thickness of the circumferential wall of the opening is represented as T,
- (T−T1)/T being 0.05 to 0.9,
- (T−T1)/L1 being 0.8 to 1.2,
- a length L2 of the tapered portion from the end surface of the one end opening prior to crimping being larger than L1;
- and
- a length from the end surface of the one end opening to the outer annular surface prior to crimping being larger than L1 but smaller than L2.
A structure for holding an object in a tubular part, the object being fixed by inwardly crimping a circumferential wall of one end opening of the tubular part, the structure comprising:
- an annular step formed in an inner peripheral surface of the circumferential wall of the tubular part;
- a chamfered portion extending between an end surface of the tubular part and an inner peripheral surface, a length, prior to crimping, in a longitudinal direction of the tubular part from the end surface to where the chamfered portion merges the inner peripheral surface being L1;
- a tapered portion extending between the end surface and an outer peripheral surface of the circumferential wall, a length, prior to crimping, in the longitudinal direction from the end surface to where the tapered portion merges the outer peripheral surface being L2;
- an inner annular surface provided in the object in contact with the annular step;
- an outer annular surface provided in the object opposite to the inner annular surface and opposing the one end opening;
- wherein the length L2 being larger than L1,
- a length from the end surface to the outer annular surface being larger than L1 and smaller than L2, and
- a bend is formed in the tapered portion after crimping the circumferential wall inwardly.
Dependencies are inferred from the claim text.