FRAMES FOR POWER MACHINES

1 . A power machine comprising:

a power source;

one or more workgroup actuators;

one or more tractive assemblies, including one or more drive actuators;

a base frame; and

a bridge frame removably secured to the base frame;

wherein the bridge frame supports the one or more workgroup actuators and the one or more tractive assemblies relative to the base frame; and

wherein the base frame supports the power source relative to the bridge frame.

2 . The power machine of claim 1 , further comprising:

a lift arm structure pivotally supported on the bridge frame relative to the base frame.

3 . The power machine of claim 2 , wherein the one or more workgroup actuators include at least one lift arm actuator arranged to move the lift arm structure relative to the bridge and base frames; and

wherein the at least one lift arm actuator is pivotally supported by the bridge frame and the lift arm structure.

4 . The power machine of claim 3 , further comprising:

a plurality of workgroup actuators that include the one or more workgroup actuators, wherein each workgroup actuator of the plurality of workgroup actuators is supported by the bridge frame.

5 . The power machine of claim 1 , wherein the bridge frame includes:

a first side box structure extending from a lower end to an upper end;

a second side box structure extending from a lower end to an upper end; and

a cross-support structure extending between the upper ends of the first and second side box structures.

6 . The power machine of claim 5 , wherein the cross-support structure and the first and second side box structures define, in combination, an internal volume that receives the power source of the power machine;

wherein the internal volume is open along one or more of a bottom side or a rear side of the bridge frame.

7 . The power machine of claim 6 , wherein the power source is an electric power source; and

wherein the base frame is removably secured to the bridge frame to support the electric power source for removal through at least one of the bottom side or the rear side of the bridge frame.

8 . The power machine of claim 5 , wherein the bridge frame further includes a central tower that extends upwardly between the first and second side box structures and includes one or more pivot mounts for one or more lift actuators included in the one or more workgroup actuators, the one or more lift actuators being arranged to raise and lower a lift arm structure of the power machine.

9 . The power machine of claim 8 , wherein the central tower further includes one or more additional pivot mounts for one or more extension actuators included in the one or more workgroup actuators, the one or more extension actuators being arranged to move, relative to the bridge frame, a link that pivotally supports the lift arm structure relative to the bridge frame.

10 . The power machine of claim 8 , wherein the central tower is arranged forward of an opening in a bottom side of the bridge frame, the opening being aligned to receive the power source into an internal volume of the bridge frame.

11 . The power machine of claim 5 , wherein the bridge frame further includes a base plate extending between the lower ends of the first and second side box structures; and

wherein the bridge frame is secured to the base frame along the base plate and along the first and second side box structures.

12 . The power machine of claim 11 , wherein the base frame includes a base pan and a rear tower extending upward from the base pan, the power source being mounted to the base pan; and

wherein the bridge frame is secured to the base plate along the base pan and along the rear tower.

13 . The power machine of claim 12 , wherein the base pan extends laterally wider than the rear tower;

wherein the first and second side box structures are secured to the rear tower at locations in which the first and second side box structures extend along first and second inboard surfaces of the rear tower; and

wherein the base pan is secured to the base plate at locations in which the base pan extends along a lower surface of the base plate.

14 . The power machine of claim 1 , wherein the cross-support structure includes a downwardly sloped shield plate extending forward from a rear end of the bridge frame; and

wherein the shield plate at least partially extends between the power source and the one or more workgroup actuators.

15 . A power machine comprising:

a multi-piece frame that includes:

a bridge frame that includes a first side structure, a second side structure, and a bridge structure extending between upper ends of the first and second side structures; and

a base frame that includes a base pan and a rear tower;

wherein the base frame is removably secured to the bridge frame along the base pan and the rear tower to support a power source of the power machine relative to the bridge frame; and

wherein the bridge frame supports a plurality of workgroup actuators and drive assemblies of the power machine relative to the base frame.

16 . The power machine of claim 15 , wherein the first and second side structures of the bridge frame are nested into the rear tower of the base frame.

17 . The power machine of claim 15 , wherein the base frame is removably secured below the bridge frame to align the power source for removal through one or more of a bottom side or rear side of the base frame while the power source is supported by the base frame.

18 . A method for a power machine, the method comprising:

removing a first power source from the power machine by removing a first base frame that supports the power source from a bridge frame that pivotably supports workgroup actuators and drive assemblies of the power machine; and

after removing the first power source, securing one of the first base frame or a second base frame to the bridge frame, with a second power source supported by the one of the first base frame or the second base frame.

19 . The method of claim 18 , wherein the one of the first or second base frames is secured along the bottom side of the bridge frame to support the power source within an internal volume of the bridge frame.

20 . The method of claim 19 , wherein the first and second power sources are electric power sources configured for hot-swappable engagement with a power system of the power machine.