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US 2004/0000413 A1Published application
Motorgrader circle drive
AssigneeVolvo Motor Graders Limited
InventorRob Walker
Life of this patent
Estimating the term…
Abstract
A circle drawbar assembly uses a series of hydraulic cylinders disposed within the circle member and attached to the drawbar frame to rotate the circle member. These cylinders can also be used to lock the circle member in a desired position. The cylinders preferably are secured to the drawbar frame at a position close to but offset from the axis of rotation of the circle member. The cylinders rotate with rotation of the circle member.
Claims20
A circle drawbar assembly for a motorgrader comprising
- a drawbar frame,
- a circle member mounted on said frame for rotation about a circle axis,
- a work implement mounted below said circle member and rotatable therewith,
- a drive arrangement secured to said frame and connected to said circle member for rotation thereof about said circle axis,
- said drive arrangement comprising a plurality of hydraulic cylinders connected to said circle member at spaced positions and each hydraulic cylinder being pivotally connected to said frame at a position adjacent to but offset from said circle axis, and
- a control arrangement for extending and retracting said cylinders in timed relationship to rotate said circle member about said circle axis.
3 more elements
A drawbar assembly for a motorgrader comprising
- a drawbar frame,
- a rotatable member mounted on said frame for rotation about a generally vertical axis,
- a work implement mounted to said rotatable member,
- a drive arrangement secured to said frame and connected to said rotatable member for rotation thereof about said vertical axis,
- said drive arrangement comprising a plurality of hydraulic cylinders with one end of each cylinder secured to said rotatable member and with an opposite end of each cylinder secured to said frame, said cylinders applying a rotational force to said rotatable member by the timed extension and retraction of said cylinders, said cylinders being disposed at different orientations to said drawbar frame,
- a control arrangement for extending and retracting said cylinders in timed relationship with each other and the position of said rotatable member to adjust the rotational position of said circle member and work implement relative to said drawbar frame.
3 more elements
Dependencies are inferred from the claim text.