| 摘要 |
In an electric power steering apparatus, an intermediate member of a shaft coupling connecting an assisting electric motor and a speed reduction mechanism together includes a cylindrical intermediate boss portion, a plurality of arm portions extending radially from the intermediate boss portion, and engagement spaces each defined by a pair of the adjacent arm portions. Furthermore, the intermediate member includes a center portion, a first cover portion, and a second cover portion. The center portion slightly protrudes toward the engagement space side with respect to the first cover portion and the second cover portion. |
| 主权项 |
1. An electric power steering apparatus comprising:
an electric motor that generates a rotation assist force in accordance with a steering operation of a driver; a shaft coupling that has a first end coupled to an output shaft of the electric motor; and a speed reduction mechanism coupled to a second end of the shaft coupling to reduce a rotation speed of the output shaft of the electric motor to transmit a reduced rotation speed to a steering mechanism; wherein the shaft coupling includes a first yoke having the first end; a second yoke having the second end; and an intermediate member provided between the first yoke and the second yoke, wherein the intermediate member includes a cylindrical intermediate boss portion, a plurality of arm portions extending radially from the intermediate boss portion, and an engagement space defined by a pair of the adjacent arm portions, wherein the intermediate member includes a center portion, a first cover portion disposed on an electric motor side with respect to the center portion, and a second cover portion disposed on a speed reduction mechanism side with respect to the center portion, wherein the center portion includes a center boss portion that configures a part of the intermediate boss portion, a center arm portion that configures a part of the arm portion, and a center engagement space that configures a part of the engagement space, the first cover portion includes a first cover boss portion that configures a part of the intermediate boss portion, a first cover arm portion that configures a part of the arm portion, and a first cover engagement space that configures a part of the engagement space, the second cover portion includes a second cover boss portion that configures a part of the intermediate boss portion, a second cover arm portion that configures a part of the arm portion, and a second cover engagement space that configures a part of the engagement space, and the center portion is configured to protrude toward an engagement space side with respect to the first cover portion and the second cover portion. |
