To provide a frame at the running body side having a pivotally attached portion with sufficient strength and rigidity by connecting a portion near the right and left pivotally attached portion at the running body side of a rocking arm by a lateral frame.
A base portion of the lower arm 17 is pivotally attached to a stay 19 fixed at the front side of a longitudinal frame 12 for pitching by a lateral axis (pivotally attached portion) 18 at the front side in the lateral direction. Each upper surface of the right and left longitudinal frame 12 for pitching has a base portion of the right/left cylinder 21 for rolling mounted thereon. The rod 22 of the cylinder 21 is disposed to protrude rearward such that the tip of the rod 22 is rotatively axially attached to the corresponding upper arm 14. A frame 25 for pitching is formed on the right/left longitudinal frame for pitching by fixing both sides of a plurality of pitching lateral frames in the lateral direction (lateral frames) at a predetermined interval in the longitudinal direction. The aforementioned structure provides the frame with sufficient strength and rigidity.
MATSUDA YOSHIMASA
KAMIMURA TAKAHIKO
FUJITA YASUSHI
