| 摘要 |
A steering shaft (2) penetrates a head tube (1) fixed to a vehicle body (A) of a motorcycle. The steering shaft (2) is coupled to a front wheel and handlebars of the motorcycle. A linear damper of a double-rod type is enclosed in the steering shaft (2). When the steering shaft (2) rotates with respect to the vehicle body (A), a feed screw (12) engaged with a screw portion (11) on the outer circumference of one of the piston rods (6a, 6a) causes the linear damper to operate. By enclosing the linear damper in the steering shaft (2), a space for disposing the steering damping device can be minimized. The feed screw (12) converts a rotational displacement of the steering shaft (2) into an axial displacement of the piston rods (6a, 6b) such that a bending load does not act on the piston rods (6a, 6b).
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