Autonomous mower

An autonomous ground working vehicle comprising:

• a chassis defining a cutting assembly opening;
• wheels coupled to the chassis;
• a motor housing coupled to the chassis, the motor housing defining a motor cavity extending in an axial direction, the motor housing comprising a first inner housing portion received by the cutting assembly opening, the first inner housing portion having a first helical thread about the motor cavity and a second inner housing portion having a second helical thread about the motor cavity that engages the first helical thread, wherein the first inner housing portion has a motor mounting surface and is axially translatable relative to the chassis and rotatably fixed relative to the chassis, and the second inner housing portion is rotatable relative to the chassis and axially fixed relative to the chassis;
• a tool motor fixed to the motor mounting surface, the tool motor having an output shaft extending in a first direction;
• a tool fixed to the output shaft;
• a bellows sealably coupled to the first inner housing portion and the chassis to seal the cutting assembly opening between the first inner housing portion and the chassis;
• a wiper seal disposed between the first inner housing portion and the chassis about the cutting assembly opening, wherein the wiper seal contacts the first inner housing portion and the chassis;
• and
• a casing fixed to the chassis, wherein the casing comprises a main section, an annular segment, and an inner wall radially spaced from the main section via the annular segment, wherein the first inner housing portion extends axially into the annular space between the inner wall and the main section of the casing.

An autonomous ground working vehicle comprising:

• a chassis;
• wheels coupled to the chassis;
• a motor housing coupled to the chassis, the motor housing defining a motor cavity extending in an axial direction, the motor housing comprising a first inner housing portion, the first inner housing portion having an outer helical thread about the motor cavity and a second inner housing portion having an inner helical thread about the motor cavity that engages the outer helical thread, wherein the first inner housing portion has a motor mounting surface and is axially translatable relative to the chassis and rotatably fixed relative to the chassis, and the second inner housing portion is rotatable relative to the chassis and axially fixed relative to the chassis;
• a tool motor fixed to the motor mounting surface, the tool motor having an output shaft extending in a first direction;
• a tool fixed to the output shaft;
• and
• a casing fixed to the chassis, wherein the casing comprises a main section, an annular segment, and an inner wall radially spaced from the main section via the annular segment, wherein the first inner housing portion extends axially into the annular space between the inner wall and the main section of the casing.