Device for longitudinally balancing an agricultural vehicle

1. A device for longitudinally balancing an agricultural vehicle, in particular a tractor, the device comprising:

at least one ballast carried on one of a front end of the vehicle or a rear end of the vehicle and movable longitudinally along the agricultural vehicle;

a first actuating device carried on the other of the front end of the vehicle or the rear end of the vehicle, the first actuating device configured to move a load on an implement connected to the vehicle upward or downward;

a sensor for detecting stress of the load on the end of the vehicle affecting a longitudinal attitude of the agricultural vehicle; and

a second actuating device connected to the ballast to move the ballast longitudinally in such a way as to at least partly compensate for the stress in response to a signal from the sensor, wherein the second actuating device moves the ballast to an extended position at least partially away from one end of the vehicle to offset the load from the other end of the vehicle, and wherein the second actuating device is positioned substantially within the ballast when in a non-extended position, and a portion of the second actuating device is disposed outside of the ballast when the ballast is in the extended position.

2. A device as claimed in claim 1 , wherein the sensor emits signals of an intensity proportional to the stress.

3. A device as claimed in claim 1 , wherein the first actuator device is a hydraulic actuator.

4. A device as claimed in claim 3 , and comprising a central control unit connected to the sensor and a hydraulic feed circuit for feeding pressurized fluid to the hydraulic actuator, the circuit comprising a valve controlled by the central control unit.

5. A device as claimed in claim 4 , wherein the hydraulic actuator and the hydraulic feed circuit communicate with each other via the valve.

6. A device as claimed in one of claim 1 , wherein the sensor is configured to detect a pressure in a hydraulic feed circuit of the first actuating device for lifting the implement which is connected to and projecting from one end of the agricultural vehicle.

7. A device as claimed in claim 1 , further comprising an inclinometer.

8. A device as claimed in claim 1 , wherein the device further comprises a bracket connected integrally to one end of the agricultural vehicle and a guide fitted to the bracket and extending longitudinally with respect to the agricultural vehicle, the ballast being mounted on the guide to slide along the guide between a non-actuated position and an actuated position in which the ballast extends at least partially away from the end of the vehicle, the second actuating device being interposed between the ballast and the bracket, and the guide substantially contained within the ballast when the ballast is in the non-extended position, and the guide partially exposed when the ballast is in the extended position.

9. A device as claimed in claim 1 , wherein the sensor is a pressure sensor.

10. An agricultural vehicle, in particular a tractor, having a longitudinal balancing device comprising:

at least one ballast movable longitudinally along the agricultural vehicle, the ballast carried on one of a front end of the vehicle or a rear end of the vehicle;

at least a first sensor and a second sensor for detecting stress affecting a longitudinal attitude of the agricultural vehicle;

a first actuating device carried on the other of the front end of the vehicle or the rear end of the vehicle, the first actuating device configured to move a load on an implement connected to the vehicle upward or downward; and

a second actuating device connected to the ballast to move the ballast longitudinally in such a way as to at least partly compensate for the stress in response to a signal from the first sensor or the second sensor, wherein the second actuating device moves the ballast to an extended position at least partially away from one end of the vehicle to offset the load from the other end of the vehicle, and wherein the second actuating device is positioned substantially within the ballast when in a non-extended position, and a portion of the second actuating device is disposed outside of the ballast when the ballast is in the extended position.

11. An agricultural vehicle as claimed in claim 10 , wherein at least one of the first sensor and the second sensor emits signals of an intensity proportional to the stress.

12. A device as claimed in claim 11 , wherein one of the first and second sensors comprises a pressure sensor.

13. A device as claimed in claim 11 , wherein the other of the first and second sensors comprises an inclinometer.

14. A device as claimed in claim 10 , wherein the first actuator device is a hydraulic actuator.

15. A device as claimed in claim 14 , and comprising a central control unit connected to the sensor and a hydraulic feed circuit for feeding pressurized fluid to the hydraulic actuator, the circuit comprising a valve controlled by the central control unit.

16. A device as claimed in claim 15 , wherein the hydraulic actuator and the hydraulic feed circuit communicate with each other via the valve.

17. A device as claimed in one of claim 10 , wherein the sensor is configured to detect a pressure in a hydraulic feed circuit of the first actuating device for lifting the implement which is connected to and projecting from one end of the agricultural vehicle.

18. A device as claimed in claim 10 , wherein the device further comprises a bracket connected integrally to one end of the agricultural vehicle and a guide fitted to the bracket and extending longitudinally with respect to the agricultural vehicle, the ballast being mounted on the guide to slide along the guide between a non-actuated position and an actuated position in which the ballast extends at least partially away from the end of the vehicle, the second actuating device being interposed between the ballast and the bracket, and the guide substantially contained within the ballast when the ballast is in the non-extended position, and the guide partially exposed when the ballast is in the extended position.