Work machine

A work machine, comprising:

• a telescopic boom including a first boom element and a second boom element that are telescopically overlapped with each other;
• a telescopic cylinder that includes a fixing-side member and a movable-side member and extends and retracts the telescopic boom;
• a housing fixed to the telescopic cylinder;
• an electric drive source that is supported by the housing and drives using power supplied from a power source;
• a first connecting mechanism that is housed in the housing and operates based on the power of the electric drive source and switches between a connected state and a disconnected state of the first boom element and the telescopic cylinder;
• a second connecting mechanism that is housed in the housing and operates based on the power of the electric drive source and switches between the connected state and the disconnected state of the first boom element and the second boom element;
• an electric circuit capable of switching between a drive state in which a supply of power from the power source to the electric drive source is allowed to drive the electric drive source, and a braking state in which the supply of power from the power source to the electric drive source stops to generate a braking force to be applied to the electric drive source;
• and
• a control unit that controls the switching between the drive state and the braking state, wherein
• the electric drive source is one electric motor,
• the work machine further comprises a switch gear that selectively transmits the power of the one electric motor to any one of the first connecting mechanism and the second connecting mechanism,
• the drive state includes a first drive state in which the one electric motor rotates in a first direction and a second drive state in which the one electric motor rotates in a second direction,
• in the first drive state, the first connecting mechanism operates based on an output of the one electric motor transmitted via the switch gear,
• in the second drive state, the second connecting mechanism operates based on an output of the one electric motor transmitted via the switch gear,
• in the first drive state, the switch gear is connected to the first connecting mechanism and is not connected to the second connecting mechanism, and
• in the second drive state, the switch gear is connected to the second connecting mechanism and is not connected to the first connecting mechanism.