Drive shaft, insertion instrument and insertion device
First Claim
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1. A drive shaft which extends along a central axis, and which is configured to transmit a driving force to a driven portion by being rotated around the central axis by a driving source, the drive shaft comprising:
- a coil-layer extension which includes one or more coil layers, the one or more coil layers being formed spirally around the central axis and extending along the central axis from a driving source side toward a driven portion side in the coil-layer extension, the coil-layer extension including;
a plurality of extension sections which extend along the central axis, and which are arranged in line in a direction along the central axis; and
a hard section which connects end portions of two of the extension sections in the direction along the central axis, and which has a higher rigidity in comparison to the extension sections, an outer peripheral surface of an outermost layer of the one or more coil layers being brazed to form the hard section,wherein the one or more coil layers extend along the central axis over the plurality of extension sections and over the hard section.
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Abstract
A drive shaft extends inside a tubular section along a shaft axis, and the drive shaft rotates around the shaft axis while transmitting a driving force generated in a driving source to a driven portion. The drive shaft includes multiple extension sections, and a hard section. Each of the extension sections extends along the shaft axis. The hard section is interposed between two of the extension sections in a direction along the shaft axis, and has a higher rigidity in comparison to that of the extension sections.
17 Citations
11 Claims
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1. A drive shaft which extends along a central axis, and which is configured to transmit a driving force to a driven portion by being rotated around the central axis by a driving source, the drive shaft comprising:
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a coil-layer extension which includes one or more coil layers, the one or more coil layers being formed spirally around the central axis and extending along the central axis from a driving source side toward a driven portion side in the coil-layer extension, the coil-layer extension including; a plurality of extension sections which extend along the central axis, and which are arranged in line in a direction along the central axis; and a hard section which connects end portions of two of the extension sections in the direction along the central axis, and which has a higher rigidity in comparison to the extension sections, an outer peripheral surface of an outermost layer of the one or more coil layers being brazed to form the hard section, wherein the one or more coil layers extend along the central axis over the plurality of extension sections and over the hard section. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification