Abstract: The invention provides a magneto-rheological grease composition which contains (a) a base oil including at least 30% by mass of an ether type synthetic oil; (b) an aliphatic diurea thickener; and (c) magnetic particles in an amount of 45 to 95% by mass based on the total mass of the composition. The magneto-rheological grease composition can show superior thermal stability, dispersion stability and magneto-rheological properties.

Abstract: Training system including: a training machine including: a Magnet Rheological fluid (MR-fluid) load generating unit generating a load to be exerted on the trainee, by using an MR-fluid having a variable viscosity depending on a magnetic field strength; mechanical arrangements; a displacement detection sensor; a power-assisting motor; a storage unit configure to store MR-fluid load characteristic information on a relationship between a current through the MR-fluid load generating unit and the load generated by the MR-fluid load generating unit; and chain and sprocket arrangements.

Abstract: Training system including: a training machine including: a Magnet Rheological fluid (MR-fluid) load generating unit generating a load to be exerted on the trainee, by using an MR-fluid having a variable viscosity depending on a magnetic field strength; mechanical arrangements; a displacement detection sensor; a power-assisting motor; a storage unit configure to store MR-fluid load characteristic information on a relationship between a current through the MR-fluid load generating unit and the load generated by the MR-fluid load generating unit; and chain and sprocket arrangements.

Abstract: A training system for training of part of a trainee's body includes a training machine, a control device controlling the training machine, and a display unit displaying a game screen. The training machine imposes a load on the trainee, with an MR-fluid load generating unit using MR fluid, which has viscosity varying with a magnetic field strength. The load is calculated on the basis of a target load and a relationship between the current in the MR-fluid load generating unit and the load generated by the MR-fluid load generating unit. The control device produces the game screen in correspondence with the trainee's training motion detected by a displacement detection sensor, and makes the display unit display the game screen, while controlling the load in the training machine.

Abstract: A training system for training of part of a trainee's body includes a training machine, a control device controlling the training machine, and a display unit displaying a game screen. The training machine imposes a load on the trainee, with an MR-fluid load generating unit using MR fluid, which has viscosity varying with a magnetic field strength. The load is calculated on the basis of a target load and a relationship between the current in the MR-fluid load generating unit and the load generated by the MR-fluid load generating unit. The control device produces the game screen in correspondence with the trainee's training motion detected by a displacement detection sensor, and makes the display unit display the game screen, while controlling the load in the training machine.