Device for stabilizing the lower steering arms of a tractor
AssigneeGKN Walterscheid GmbH
InventorsWolfgang Adamek, Herbert Coenen, Jürgen Vollmer
Life of this patent
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Abstract
The invention relates to a device for stabilizing the two lower steering arms (1) of a tractor. The lower steering arms (1) can be actuated by a hydraulic power lift (9). Each lower steering arm (1) is associated with a side strut (6) which includes a single-acting hydraulic cylinder (7) to stabilize and secure the lower steering arm (1). A pre-selection valve (12) and a control valve (13) enable the hydraulic cylinders to be connected to the power lift (9) either via a line or loaded separately by a second pressure source (P2). Thus, independently of the actuation of the power lift (9), the two lower steering arms can be centrally centered by the hydraulic cylinders (7).
Claims3
A control device in combination with two lower steering arms of a tractor, a hydraulic power lift for lifting or lowering the two lower steering arms, each lower steering arm actuable by one side strut, each side strut having a hydraulic cylinder, said hydraulic power lift connected to a first pressure source and said control device comprising:
- a second pressure source;
- a switchable pre-selection valve;
- and
- a switchable control valve;
- said pre-selection valve having a first port connected to the first pressure source, a second port connected to the second pressure source and an outlet port connected to an inlet port of the control valve, and said pre-selection valve switchable to connect either the first pressure source or the second pressure source to the inlet port of the control valve;
- said control valve switchable to a first position jointly connecting the two hydraulic cylinders to the inlet port and to a second position jointly connecting the two cylinders to a return flow means wherein said two hydraulic cylinders enable the two lower steering arms of the tractor to float sideways.
Dependencies are inferred from the claim text.