Vehicle steering apparatus

A vehicle steering apparatus, comprising:

• an electric motor including a cylindrical motor housing and a rotatable shaft;
• a control device that controls the driving of the electric motor;
• a first housing and a second housing that define an accommodation chamber that accommodates the control device and contact each other;
• a transmission mechanism that transmits power from the electric motor to a steering mechanism;
• a transmission mechanists housing that houses the transmission mechanism;
• and
• a preload applying mechanism,
• wherein the first housing is at least a part of the motor housing,
• the first housing includes a first interior wall surface that partially partitions the accommodation chamber,
• the second housing includes a second interior wall surface that partially partitions the accommodation chamber,
• the first interior wall surface and the second interior wall surface are opposite to each other in an axial direction of the rotatable shaft,
• the transmission mechanism includes a driving member coaxially connected to the rotatable shaft together rotatably via a connection member, and a driven member that is driven by the driving member,
• the driving member includes a first end relatively closer to the rotatable shaft, and a second end relatively farther from the rotatable shaft,
• the first end of the driving member is rotatably supported by a first bearing held in the transmission mechanism housing,
• the second end of the driving member is rotatably supported by a second bearing held in the transmission mechanism housing,
• the preload applying mechanism presses the second bearing, to apply a preload to the first bearing and the second bearing,
• the second housing is provided in the transmission mechanism housing,
• the electric motor includes a rotor that rotates together with the rotatable shaft, and a stator opposite to the rotor,
• the control device is arranged between the rotor and the first bearing in the axial direction of the rotatable shaft,
• the rotatable shaft includes an end connecting to the connection member,
• the end of the rotatable shaft is rotatably supported by a third bearing held in the motor housing,
• the control device includes a power substrate having a power circuit for supplying power to the electric motor mounted thereon, and
• at least a of the power substrate and at least part of the third bearing are arranged at positions that overlap each other in the axial direction of the rotatable shaft.