Abstract: A method for cleaning a storage tank to which sodium metal is adherent, the method containing: filling, with an inert oil, the storage tank to which sodium metal is adherent; subsequently adding water, water vapor, or a humidified inert gas to the inert oil; providing a gas discharge line to the storage tank and measuring the hydrogen gas concentration in the gas discharge line; regulating the amount of the water, water vapor, or humidified inert gas to be added per hour in accordance with the level of the hydrogen gas concentration; regulating the temperature of the inert oil to 0-98° C.; and converting the sodium metal into caustic soda while changing the liquid surface level of the inert oil in parallel with addition of the water, water vapor, or humidified inert gas to the inert oil.

Abstract: An axle unit for a vehicle is provided which comprises a hub that installs thereon a vehicle wheel and is rotatable together with the vehicle wheel, a hub bearing that is mounted on a vehicle body and rotatably supports the hub, a rotary encoder that is attached concentrically to the hub and is rotatable together with the hub, a cover that is made of a non-magnetic material and covers an open end of the hub bearing that is located on the side thereof where the rotary encoder is provided, a rotational speed sensor that has a detecting section that is made of a magnetic material and disposed outside the cover and so as to face the rotary encoder, and a magnetic body that is provided at a portion of the cover that is placed between the detecting section of the rotational speed sensor and the rotary encoder.

Abstract: An axle unit for a vehicle is provided which comprises a hub that installs thereon a vehicle wheel and is rotatable together with the vehicle wheel, a hub bearing that is mounted on a vehicle body and rotatably supports the hub, a rotary encoder that is attached concentrically to the hub and is rotatable together with the hub, a cover that is made of a non-magnetic material and covers an open end of the hub bearing that is located on the side thereof where the rotary encoder is provided, a rotational speed sensor that has a detecting section that is made of a magnetic material and disposed outside the cover and so as to face the rotary encoder, and a magnetic body that is provided at a portion of the cover that is placed between the detecting section of the rotational speed sensor and the rotary encoder.