Assist mechanism and electric power steering device
AssigneeNsk Ltd.
InventorYasushi Honda
Life of this patent
Estimating the term…
Abstract
An assist mechanism includes: an electric motor; a shaft-shaped member in which a worm engaged with a worm wheel is formed; and a coupling that couples an output shaft of the electric motor and the shaft-shaped member to each other. The smallest rotation order among rotation orders of the electric motor and a rotation order of the worm are prime to each other. The smallest rotation order among the rotation orders of the electric motor and a rotation order of the coupling are prime to each other. The rotation order of the worm and the rotation order of the coupling are prime to each other. The rotation order of the worm is 3. The rotation order of the coupling is 5 or 7.
Claims7
An assist mechanism comprising:
- an electric motor;
- a shaft-shaped member in which a worm engaged with a worm wheel is formed;
- and
- a coupling that couples an output shaft of the electric motor and the shaft-shaped member to each other, wherein
- a smallest rotation order among rotation orders of the electric motor and a rotation order of the worm are prime to each other, the smallest rotation order among the rotation orders of the electric motor and a rotation order of the coupling are prime to each other, and the rotation order of the worm and the rotation order of the coupling are prime to each other,
- the rotation order of the worm is 3, and
- the rotation order of the coupling is 5 or 7.
Dependencies are inferred from the claim text.