Self-propelled irrigation system with articulated drive tower

1. A drive tower for a self-propelled irrigation system, comprising:

a base beam assembly comprising a first beam member pivotally connected to a second beam member, said first and second beam members being rotatable relative to each other about a first pivot connection;

a tower structure comprising first and second tower members, said first tower member being pivotally connected at its lower end to the first beam member about a second pivot connection, said second tower member being pivotally connected at its lower end to the second beam member about a third pivot connection, and said first and second tower members extending upwardly from said second and third pivot connections and converging together to support an elongated water pipeline above the base beam assembly; and

a plurality of drive assemblies mounted to the base beam assembly for supporting and propelling the base beam assembly over a field;

wherein said plurality of drive assemblies comprises first and second drive assemblies mounted to respective ends of the base beam assembly, and a third drive assembly mounted to said base beam assembly between said first and second drive assemblies;

wherein said third drive assembly is mounted to said base beam assembly between said second and third pivot connections; and

wherein said second pivot connection is located between and spaced from each of said first and third drive assemblies so that a weight from said first tower member is distributed through the base beam assembly to both of the first and third drive assemblies, and wherein said third pivot connection is located between and spaced from each of said second and third drive assemblies so that a weight from said second tower member is distributed through the base beam assembly to both of the second and third drive assemblies.

2. The drive tower according to claim 1 , wherein said first, second and third drive assemblies are interconnected together and driven by a common drive motor assembly.

3. The drive tower according to claim 1 , wherein said first, second and third pivot connections have respective pivot axes that extend in a generally transverse horizontal direction relative to said base beam assembly.

4. The drive tower according to claim 1 , wherein said drive assemblies each comprises a drive gear box, and a driven wheel connected to an output shaft of said drive gear box.

5. The drive tower according to claim 1 , wherein said first tower member is pivotally connected to and supported by said first beam member at a location between and spaced from the respective ends of said first beam member, and wherein said second tower member is pivotally connected to and supported by said second beam member at a location between and spaced from the respective ends of said second beam member.

6. The drive tower according to claim 1 , wherein said second and third pivot connections are located closer to said first and second drive assemblies, respectively, than to said third drive assembly to substantially balance a weight of the system between the three drive assemblies.

7. A drive tower for a self-propelled irrigation system, comprising:

a base beam assembly comprising a first beam member pivotally connected to a second beam member, said first and second beam members being rotatable relative to each other about a first pivot connection;

a tower structure comprising first and second tower members, said first tower member being pivotally connected at its lower end to the first beam member about a second pivot connection, said second tower member being pivotally connected at its lower end to the second beam member about a third pivot connection, and said first and second tower members extending upwardly from said second and third pivot connections and converging together to support an elongated water pipeline above the base beam assembly; and

a plurality of drive assemblies mounted to the base beam assembly for supporting and propelling the base beam assembly over a field;

wherein said plurality of drive assemblies comprises first and second drive assemblies mounted to respective ends of the base beam assembly, and a third drive assembly mounted to said base beam assembly between said first and second drive assemblies;

wherein said first, second and third drive assemblies are interconnected together and driven by a common drive motor assembly; and

wherein said drive motor assembly comprises a motor and a main drive gear box, and wherein said drive assemblies are interconnected by a first drive shaft connecting the main drive gear box to the first drive assembly, a second drive shaft connecting the main drive gear box to the third drive assembly, and a third drive shaft connecting the third drive assembly to the second drive assembly.

8. A drive tower for a self-propelled irrigation system, comprising:

a base beam assembly;

a tower structure supported by and extending above said base beam assembly for supporting an elongated water pipeline above the base beam assembly;

a plurality of drive assemblies for supporting and propelling the base beam assembly over a field, said drive assemblies comprising first and second drive assemblies mounted to respective first and second ends of the base beam assembly, and a third drive assembly mounted to the base beam assembly between said first and second drive assemblies; and

said base beam assembly being articulated at a location between its first and second ends to allow said third drive assembly to move vertically relative to said first and second drive assemblies when traversing uneven terrain;

wherein said tower structure comprises first and second tower members, said first tower member being pivotally connected at its lower end to the first beam member about a second pivot connection, said second tower member being pivotally connected at its lower end to the second beam member about a third pivot connection, and said first and second tower members extending upwardly from said second and third pivot connections and converging together to support an elongated water pipeline above the base beam assembly;

wherein said third drive assembly is mounted to said base beam assembly between said second and third pivot connections; and

wherein said second pivot connection is located between and spaced from each of said first and third drive assemblies so that a weight from said first tower member is distributed through the base beam assembly to both of the first and third drive assemblies, and wherein said third pivot connection is located between and spaced from each of said second and third drive assemblies so that a weight from said second tower member is distributed through the base beam assembly to both of the second and third drive assemblies.

9. The drive tower according to claim 8 , wherein said base beam assembly comprises a first beam member pivotally connected to a second beam member at a first pivot connection, said first and second beam members being rotatable relative to each other about a pivot axis extending in a generally transverse horizontal direction relative to said base beam assembly.

10. The drive tower according to claim 8 , wherein said second and third pivot connections have respective pivot axes that extend in a generally transverse horizontal direction relative to said base beam assembly.

11. The drive tower according to claim 8 , wherein said first tower member is pivotally connected to and supported by said first beam member at a location between and spaced from the respective ends of said first beam member, and wherein said second tower member is pivotally connected to and supported by said second beam member at a location between and spaced from the respective ends of said second beam member.

12. The drive tower according to claim 8 , wherein said drive assemblies each comprises a drive gear box, and a driven wheel connected to an output shaft of said drive gear box.

13. The drive tower according to claim 8 , wherein said first, second and third drive assemblies are interconnected together and driven by a common drive motor assembly.

14. The drive tower according to claim 8 , wherein said second and third pivot connections are located closer to said first and second drive assemblies, respectively, than to said third drive assembly to substantially balance a weight of the system between the three drive assemblies.

15. A drive tower for a self-propelled irrigation system, comprising:

a base beam assembly;

a tower structure supported by and extending above said base beam assembly for supporting an elongated water pipeline above the base beam assembly;

a plurality of drive assemblies for supporting and propelling the base beam assembly over a field, said drive assemblies comprising first and second drive assemblies mounted to respective first and second ends of the base beam assembly, and a third drive assembly mounted to the base beam assembly between said first and second drive assemblies; and

said base beam assembly being articulated at a location between its first and second ends to allow said third drive assembly to move vertically relative to said first and second drive assemblies when traversing uneven terrain;

wherein said first, second and third drive assemblies are interconnected together and driven by a common drive motor assembly; and

wherein said drive motor assembly comprises a motor and a main drive gear box, and wherein said drive assemblies are interconnected by a first drive shaft connecting the main drive gear box to the first drive assembly, a second drive shaft connecting the main drive gear box to the third drive assembly, and a third drive shaft connecting the third drive assembly to the second drive assembly.

16. A self-propelled irrigation system, comprising:

an elongated pipeline supported above a field by a plurality of drive towers, at least one of said drive towers comprising:

a base beam assembly;

a tower structure supported by and extending above said base beam assembly for supporting the elongated water pipeline above the base beam assembly;

a plurality of drive assemblies for supporting and propelling the base beam assembly over a field, said drive assemblies comprising first and second drive assemblies mounted to respective first and second ends of the base beam assembly, and a third drive assembly mounted to the base beam assembly between said first and second drive assemblies; and

said base beam assembly being articulated at a location between its first and second ends to allow said third drive assembly to move vertically relative to said first and second drive assemblies when traversing uneven terrain;

wherein said tower structure comprises first and second tower members, said first tower member being pivotally connected at its lower end to the first beam member about a second pivot connection, said second tower member being pivotally connected at its lower end to the second beam member about a third pivot connection, and said first and second tower members extending upwardly from said second and third pivot connections and converging together to support an elongated water pipeline above the base beam assembly;

wherein said third drive assembly is mounted to said base beam assembly between said second and third pivot connections; and

wherein said second pivot connection is located between and spaced from each of said first and third drive assemblies so that a weight from said first tower member is distributed through the base beam assembly to both of said first and third drive assemblies, and wherein said third pivot connection is located between and spaced from each of said second and third drive assemblies so that a weight from said second tower member is distributed through the base beam assembly to both of said second and third drive assemblies.

17. The self-propelled irrigation system according to claim 16 , wherein said base beam assembly comprises a first beam member pivotally connected to a second beam member at a first pivot connection, said first and second beam members being rotatable relative to each other about a pivot axis extending in a generally transverse horizontal direction relative to said base beam assembly.

18. The self-propelled irrigation system according to claim 16 , wherein said second and third pivot connections have respective pivot axes that extend in a generally transverse horizontal direction relative to said base beam assembly.

19. The self-propelled irrigation system according to claim 16 , wherein said second and third pivot connections are located closer to said first and second drive assemblies, respectively, than to said third drive assembly to substantially balance a weight of the system between the three drive assemblies.