Steering damper device for saddle riding vehicle

1. A steering damper device for a saddle riding vehicle, the steering damper device giving a damping force to rotate a steering shaft of the saddle riding vehicle and comprising:

a tubular damper including a cylindrical damper cylinder and a piston rod slidably passed through the damper cylinder, either the damper cylinder or the piston rod being supported on an upper frame or a down frame of the saddle riding vehicle, the upper frame extending rearwardly from a head pipe through which the steering shaft passes and which holds the steering shaft therein rotatably about an axis of the steering shaft, the down frame extending downwardly from the head pipe, and the steering shaft rotating with a bottom bridge;

a linkage mechanism to connect the bottom bridge to the tubular damper; and

a sub-upper pipe extending in a fore-aft direction so as to connect the upper frame and the head pipe through a frame connecting member,

wherein the tubular damper is disposed such that an axis thereof is disposed on a vehicle width direction central plane,

wherein the tubular damper extends or contracts as the bottom bridge rotates,

wherein the tubular damper extends or contracts within a space between the upper frame and the down frame in a side view, and

wherein the tubular damper is disposed so as to extend along the sub-upper pipe.

2. The steering damper device for the saddle riding vehicle according to claim 1 , wherein the linkage mechanism includes

a link rod extending rearwardly from the bottom bridge and

a linkage member to connect the tubular damper to the link rod.

3. The steering damper device for the saddle riding vehicle according to claim 2 ,

wherein the linkage member has an axis of rotation that extends in parallel with a vehicle width direction, and

wherein a connecting point between the link rod and the linkage member is disposed downwardly of a plane that passes through the axis of rotation of the linkage member and that is perpendicular to the steering shaft.

4. The steering damper device for the saddle riding vehicle according to claim 2 , further comprising:

a cross pipe extending across a pair of left and right frames, the down frame including the pair of left and right frames, and the pair of left and right frames extending downwardly from the head pipe,

wherein the tubular damper is supported on the cross pipe.

5. The steering damper device for the saddle riding vehicle according to claim 1 , further comprising:

a cross pipe extending across a pair of left and right frames, the down frame including the pair of left and right frames, and the pair of left and right frames extending downwardly from the head pipe,

wherein the tubular damper is supported on the cross pipe.

6. A steering damper device for a saddle riding vehicle, the steering damper device giving a damping force to rotate a steering shaft of the saddle riding vehicle and comprising:

a tubular damper including a cylindrical damper cylinder and a piston rod slidably passed through the damper cylinder, either the damper cylinder or the piston rod being supported on an upper frame or a down frame of the saddle riding vehicle, the upper frame extending rearwardly from a head pipe through which the steering shaft passes and which holds the steering shaft therein rotatable about an axis of the steering shaft, the down frame extending downwardly from the head pipe, and the steering shaft rotating with a bottom bridge;

a linkage mechanism to connect the bottom bridge to the tubular damper; and

a cross pipe extending across a pair of left and right frames, the down frame including the pair of left and right frames, and the pair of left and right frames extending downwardly from the head pipe,

wherein the tubular damper is disposed such that an axis thereof is disposed on a vehicle width direction central plane,

wherein the tubular damper extends or contracts as the bottom bridge rotates,

wherein the tubular damper extends or contracts within a space between the upper frame and the down frame in a side view, and

wherein the tubular damper is supported on the cross pipe.

7. A steering damper device for a saddle riding vehicle, the steering damper device giving a damping force to rotate a steering shaft of the saddle riding vehicle and comprising:

a tubular damper including a cylindrical damper cylinder and a piston rod slidably passed through the damper cylinder, either the damper cylinder or the piston rod being supported on an upper frame or a down frame of the saddle riding vehicle, the upper frame extending rearwardly from a head pipe through which the steering shaft passes and which holds the steering shaft therein rotatably about an axis of the steering shaft, the down frame extending downwardly from the head pipe, and the steering shaft rotating with a bottom bridge;

a linkage mechanism to connect the bottom bridge to the tubular damper; and

a bottom stay protruding rearwardly from a crosswise center of a rear portion of the bottom bridge,

wherein the tubular damper is disposed such that an axis thereof is disposed on a vehicle width direction central plane,

wherein the tubular damper extends or contracts as the bottom bridge rotates,

wherein the tubular damper extends or contracts within a space between the upper frame and the down frame in a side view,

wherein the linkage mechanism includes a link rod extending rearwardly from the bottom bridge and a linkage member to connect the tubular damper to the link rod, and

wherein the link rod has a front end connected to the bottom stay and a rear end connected to the linkage member.

8. The steering damper device for the saddle riding vehicle according to claim 7 , further comprising:

a sub-upper pipe extending in a fore-aft direction so as to connect the upper frame and the head pipe through a frame connecting member,

wherein the tubular damper is disposed so as to extend along the sub-upper pipe.