Toyota Jidosha Kabushiki Kaisha

Kyomi Shimada

Eiji Yamada

Yasutomo Kawabata

Shoichi Sasaki

Takao Miyatani

Shigetaka Nagamatsu

Masanao Shiomi

Ryouji Mizutani

Hidetsugu Hamada

Shigeru Matsuhashi

Nuio Tsuchida

Shigeru Matuhashi

Power transmission apparatus, four-wheel drive vehicle with power

A rotational actuator includes an actuator case, a first rotor supported on the actuator case for rotation about an axis of rotation, a second rotor supported on the actuator case coaxially with the first rotor and for rotation independent of the first rotor, an expandable member having one end secured to the second rotor and the other end secured to the first rotor for relatively rotating the first and second rotors by expansion or contraction thereof, and an expandable member controller for controlling the extent of expansion and contraction of the expandable member. The momentum of the first rotor in the rotational direction thereof when the expandable member is expanded or contracted is set to be higher than the momentum of the second rotor in the rotational direction thereof at this time.

Rotational actuator

In order to prevent a looseness of bolts after main clamping, a nut runner of the present invention comprises a torque sensor for detecting a clamping torque T of a clamping unit, and a torque comparison means for comparing the clamping torque T with a clamping completion torque ST. The nut runner further includes a torque control means which gradually reduces a rotational torque of the motor until a resilience such as a torsion accumulated in the clamping unit is entirely nullified when the clamping torque T reaches the clamping completion torque ST. This ensures an effective cancellation of an inverse torque arising from the resilience and acting in the direction loosening the bolt, thus preventing the bolt from loosening.

Nut runner for clamping bolts with predetermined torque and bolt

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Toyota, Japan

Kyomi Shimada