Self-propelled drive mechanism
AssigneeThe Manitowoc Company, Inc.
InventorsJames G. Morrow, Sr., David J. Pech, Norman J. Kutz
Life of this patent
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Abstract
A self-propelled drive mechanism for a crawler crane or the like including a variable displacement pump and one fixed and one variable displacement motor for each crawler assembly. The displacement of the variable displacement motor may be regulated to alter the combined driving torque and speed imparted by the motors to the crawler assemblies and includes automatic self-balancing feedback means for maintaining the hydraulic pressure within predetermined limits.
Claims5
A self-propelled drive mechanism for a load handling vehicle having a central body portion, a pair of side frames and a crawler assembly mounted on each of the side frames, comprising in combination, hydraulic drive means for each crawler assembly including a drive sprocket around which a crawler track is trained, hydraulic pump means mounted on said body portion and detachably connected to said respective drive means for supplying hydraulic fluid thereto, said drive means each including two hydraulic motors coupled to said drive sprocket, one of said motors being a fixed displacement type, the other being a variable displacement type and both being connected in parallel to said pump means, control means for selectively reversing the flow of hydraulic fluid supplied by said pump means to said respective drive means to independently drive said tracks in forward and reverse directions as desired, and means for regulating the displacement of said variable displacement motor to effectively alter the combined driving torque and speed imparted by said motors to said sprocket.
Dependencies are inferred from the claim text.