Abstract: A drive device for an electric vehicle includes: a motor configured to be in a drive wheel of the electric wheel; and a reduction gear configured to reduce rotational speed of the motor and transmit resultant rotation to the drive wheel; the reduction gear including a sun gear configured to be driven by the motor, a first planetary gear that is configured to mesh with the sun gear and has a first number of teeth, a fixed ring gear that is meshed with the first planetary gear and arranged non-rotatably, a second planetary gear that is coupled to the first planetary gear and has a second number of teeth that is smaller than the first number of teeth, a movable ring gear that is meshed with the second planetary gear and arranged rotatably, and a transmission member configured to transmit rotation of the movable ring gear to the drive wheel.

Abstract: A movable body is a tricyclic movable body automatically moving and includes: a first steering wheel which is steerable but not drivable; a second steering wheel which is steerable but not drivable and provided on a side in a first direction with respect to the first steering wheel; and a drive wheel which is steerable and drivable and provided on a side in a second direction orthogonal to the first direction with respect to the first steering wheel and the second steering wheel.

Abstract: A power transmission device includes a first power transmission path for transmitting a driving force of a motor to one driven shaft, and a second power transmission path for transmitting the driving force of the motor to another driven shaft. At least one of the first power transmission path or the second power transmission path includes a first intermediate rotor fixed to an output shaft of the motor, a second intermediate rotor rotated by the first intermediate rotor and moving arcuately along an outer circumference of the first intermediate rotor, a driving shaft rotated by the second intermediate rotor and transmitting the driving force to the one driven shaft or the another driven shaft. The driving shaft is configured to move in a direction perpendicular to an axial center direction of the driving shaft in accordance with movement of the second intermediate rotor around the first intermediate rotor.

Abstract: A tooth surface shape design support device for supporting design of a tooth surface shape of a gear includes a principal component shape data acquisition unit configured to acquire a plurality of principal component shape data obtained by performing principal component analysis on a tooth surface shape sample data group including a plurality of tooth surface shape sample data indicating samples of the tooth surface shape, and a tooth surface shape evaluation unit configured to evaluate a tooth surface shape defined by using the plurality of principal component shape data acquired by the principal component shape data acquisition unit.

Abstract: A drive device for an electric vehicle includes: an in-wheel motor; and a reduction gear that reduces rotational speed of the in-wheel motor and transmits resultant rotation to a drive wheel of the electric vehicle; the reduction gear including a sun gear driven by the in-wheel motor, a first planetary gear that is arranged to be meshed with the sun gear and has a first number of teeth, a fixed ring gear that is meshed with the first planetary gear and arranged non-rotatably, a second planetary gear that is coupled to the first planetary gear and has a second number of teeth that is smaller than the first number of teeth, a movable ring gear that is meshed with the second planetary gear and arranged rotatably, and a transmission member that transmits rotation of the movable ring gear to the drive wheel.

Abstract: A power transmission device includes a first power transmission path for transmitting a driving force of a motor to one driven shaft, and a second power transmission path for transmitting the driving force of the motor to another driven shaft. At least one of the first power transmission path or the second power transmission path includes a first intermediate rotor fixed to an output shaft of the motor, a second intermediate rotor rotated by the first intermediate rotor and moving arcuately along an outer circumference of the first intermediate rotor, a driving shaft rotated by the second intermediate rotor and transmitting the driving force to the one driven shaft or the another driven shaft. The driving shaft is configured to move in a direction perpendicular to an axial center direction of the driving shaft in accordance with movement of the second intermediate rotor around the first intermediate rotor.