| 摘要 |
PROBLEM TO BE SOLVED: To selectively join either a hydraulic piping, having a large diameter or a hydraulic piping having a small diameter by providing a connector and with both an outside dimension of one hydraulic steel pipe and an inner diameter dimension, capable of inserting and fitting one hydraulic piping and selectively attaching the hydraulic piping. SOLUTION: Hydraulic pipings 14, 15 having reference sizesϕDp3,ϕDp4 are selectively jointed with a connector 13. An oil path 16 is opened to the core part to the connector 13, and a screw part 17 is threadably attached to the other parts through the connector 13. A neck part 18 is protruded and formed around the oil path opening part of one end side to which the oil path is opened. This shape gives an outer diameter part 180D of the neck part 18. An inside diameter part 18ID of the neck part 18 is an inner diameter dimensionϕdno of the inside diameter part 18ID. A radius of curvature R14 is the bending radius of the hydraulic piping 14. A length L14 is a direct pipe length from an end surface (d) of the hydraulic piping 14. A radius of curvature R15 is the bend radius of the hydraulic steel pipe 15. A length L15 is the length of a straight pipe part from an end surface (e) of the hydraulic piping 15.
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