Robot

A robot comprising:

• a chest;
• a pair of right and left upper limbs, each of the upper limbs including an upper arm, a forearm, and a hand, the upper arm, the forearm, and the hand being connected in series to either a right or a left of an upper portion of the chest;
• and
• a pair of right and left shoulders connecting the right and left upper arms rotatably to the chest with two rotational degrees of freedom, respectively,
• wherein the shoulder includes:
• a shoulder joint connecting the upper arm rotatably to the chest with two rotational degrees of freedom, the shoulder joint including a rotation axis extending from either a right end or a left end of the upper portion of the chest to the side far from the center of the chest and the rear side, the shoulder joint allowing rotation around the rotation axis and rotation changing an angle formed by the rotation axis and the upper arm;
• a chest-side main link attaching unit provided in the chest at a position below the shoulder joint;
• an upper arm main link attaching unit provided in the upper arm;
• an upper arm drive main actuator including an upper arm drive main link having a variable length and a power source for generating force changing the length of the upper arm drive main link, one end of the upper arm drive main link being attached rotatably to the upper arm main link attaching unit, the other end of the upper arm drive main link being attached rotatably to the chest-side main link attaching unit;
• a chest-side auxiliary link attaching unit provided in the chest at a position being below the shoulder joint and sandwiching the shoulder joint in a front-back direction together with the upper arm main link attaching unit;
• an upper-arm-drive-main-link-side auxiliary link attaching unit provided in the upper arm drive main link;
• and
• an upper arm drive auxiliary actuator including an upper arm drive auxiliary link having a variable length and a power source for generating force changing the length of the upper arm drive auxiliary link, one end of the upper arm drive auxiliary link being attached rotatably to the upper-arm-drive-main-link-side auxiliary link attaching unit, the other end of the upper arm drive auxiliary link being attached rotatably to the chest-side auxiliary link attaching unit.