Patent ID: 7721832

Claim:
A suspension system for supporting left and right longitudinally extending frame members of a tracked vehicle with respect to left and right track assemblies, comprising: a transverse support fixed to and extending between the left and right frame members, the support having a first end and a second end, the first end having a front pivot member and a rear pivot member, the front pivot member being spaced longitudinally apart from the rear pivot member, a front support pivot bore extending through the front pivot member, and a rear support pivot bore extending through the rear pivot member; a transverse swing arm having a first end pivotally coupled to the first end of the support and a second end, the swing arm having a front arm and a rear arm, the front arm being spaced longitudinally apart from the rear arm, a first front bore extending through a first end of the front arm, and a first rear bore extending through a first end of the rear arm, a second front bore extending through the front arm and spaced apart from the first front bore, and a second rear bore extending through the rear arm and spaced apart from the first rear bore; a front pivot pin received by the front support pivot bore and the first front bore; a rear pivot pin received by the rear support pivot bore and the first rear bore; a resilient unit coupled between the frame and the second end of the swing arm; a transverse walking beam having opposite ends coupled to the respective left and right track assemblies, and having a beam bore extending through the walking beam in a fore-and-aft direction; and a beam pivot pin pivotally coupling a central portion of the walking beam to a portion of the swing arm, the beam pivot pin being received by the beam bore, by the second front bore and by the second rear bore.