| 摘要 |
PROBLEM TO BE SOLVED: To provide a joint mechanism which can achieve weight reduction. SOLUTION: The joint mechanism is formed of a first member 2 and a second member 4 rotatably coupled to the first member 2 via a first shaft portion 8, and the second member 4 is relatively rotated on the first shaft portion 8 with respect to the first member 2 by pressure of hydraulic fluid, to thereby change an angle between the first member 2 and the second member 4. The first member 2 has arranged therein a hydraulic fluid chamber 2d to/from which the hydraulic fluid is supplied/delivered, and the second member 4 has a first piston portion 4f that divides a space in the hydraulic fluid chamber 2d of the first member 2 into two sections. Then by supplying the hydraulic fluid into one of the space sections in the hydraulic fluid chamber 2d of the first member 2 divided by the first piston portion 4f, and delivering the hydraulic fluid from the other space section, the first piston portion 4f is moved to the other space section, and the second member 4 is relatively rotated on the first shaft portion 8 with respect to the first member 2. COPYRIGHT: (C)2008,JPO&INPIT
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