| 摘要 |
Even when bending stress acts on a steering gearbox 1 about attachment holes 161 and 171 of vehicle attachment boss portions 16 and 17, deformation of the vehicle attachment boss portions 16 and 17 in both the longitudinal direction and the vertical direction of the vehicle becomes small since rigidity with respect to deformation in the vicinity of the vehicle attachment boss portions 16 and 17 in both the longitudinal direction and the vertical direction of the vehicle is large due to a first rib 61 to a fourth rib 64. Accordingly, it is possible to improve steering stability at the time a steering reaction force occurs.
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