In the lower limb joints brace assist the joint function of the knee joint and ankle joint that is paralyzed, to recover, to provide appliances small, sensitive, high output. And a lower limb joint brace which is connected to bending in the vertical direction of the body by joints in a position corresponding to the ankle joint and the lower structure for supporting the foot, and an upper structure mounted on the lower limbs, and short, the joint a stator enclosing the MR fluid viscosity is changed by the magnetic force to the fluid chambers of the plurality of formed in a sector shape are partitioned in the circumferential direction of the closed cylindrical space, to the stator, the shaft is rotatably supported and is set in the joint position communication path is composed of a rotor which is projected to the partition plate by securing the rear chamber and the front chamber back and forth in each fluid chamber from the part, to communicate with the rear chamber and the front chamber of the fluid chamber specific to the stator It is provided away from the fluid chamber is provided with a communication passage for communicating each of the rear chamber with each other and the front chamber between each fluid chamber to the axis of the rotor, arranged electromagnets on the side of the communication path, the power supplied to the electromagnet controls the viscosity of the MR fluid flowing through the communication passage by adjusting the magnetic force based on, to adjust the rotational resistance of the upper structure and lower structure.麻痺している足関節や膝関節の関節機能を補助、回復させる下肢継手装具において、小型、鋭敏、高出力の装具を提供する。足部を支持する下部構成体と、下肢に装着される上部構成体とを足関節に相当する位置で継手によって身体の上下方向に屈伸可能に連結した下肢継手装具であり、前記継手を、短円筒状の密閉空間を周方向に仕切って扇形に形成した複数の流体室に磁力によって粘度が変わるMR流体を封入したステータと、前記ステータに、関節位置に設定されて回転可能に支持される軸部から各流体室の中に前後に前室と後室を確保して仕切板を突設したロータとで構成し、前記ステータに特定の流体室の前室と後室とを連通する連通通路を流体室から離して設けるとともに、ロータの軸部に各流体室の前室同士及び後室同士をそれぞれ連絡する連絡通路を設け、連通通路の側面に電磁石を配し、電磁石に供給される電力に基づく磁力を調整して連通通路を流動するMR流体の粘度を制御し、下部構成体と上部構成体の回転抵抗を調整する。
