Drive unit and maintenance method for the same

1. A drive unit, comprising:

an actuator from which an output rod protrudes at a first end of a cylinder, the output rod being coupled to a movable part of an aircraft;

an attachment disposed on a second end of the cylinder, the second end being the end opposite the first end along an axial direction of the cylinder;

a reaction link coupled to the movable part at a first end of the reaction link and coupled to the attachment at a second end of the reaction link; and

a connection-disconnection section allowing the cylinder and the attachment to be coupled to and separated from each other,

wherein the attachment includes a first electric connector to which an external electric wire extended from the outside of the attachment is connected, and

wherein the actuator includes an actuator-side electric connector, the actuator-side electric connector being connected to the first electric connector by coupling the attachment to the cylinder.

2. The drive unit of claim 1 , wherein the connection-disconnection section includes:

a flange provided at the second end of the cylinder, the flange protruding outward in a radial direction of the cylinder;

a flange provided at an end of the attachment facing the cylinder, the flange protruding outward in the radial direction of the cylinder; and

a bolt allowing the flange of the cylinder and the flange of the attachment to be coupled to and separated from each other.

3. The drive unit of claim 1 , wherein the connection-disconnection section includes:

a tube portion disposed at one of: the second end of the cylinder and the end of the attachment facing the cylinder; and

an insertion portion disposed at the other of: the second end of the cylinder and the end of the attachment facing the cylinder, the insertion portion being fitted in the tube portion.

4. The drive unit of claim 1 , wherein the first electric connector and the actuator-side electric connector are aligned in the axial direction of the cylinder.

5. The drive unit of claim 1 , wherein a convex portion is provided at one of: the second end of the cylinder, and the end of the attachment facing the cylinder, the convex portion protrudes toward the other of: the second end of the cylinder, and the end of the attachment facing the cylinder, and

wherein a concave portion is provided at the other of: the second end of the cylinder, and the end of the attachment facing the cylinder, the convex portion is fitted in the concave portion, and

wherein a second electric connector connected to the first electric connector is disposed on one of: an end surface of the convex portion on a protruding side, and a bottom of the concave portion, and

wherein the actuator-side electric connector is disposed on the other of: the end surface of the convex portion on the protruding side, and the bottom of the concave portion.

6. The drive unit of claim 5 , wherein the convex portion is a position sensor provided at the second end of the cylinder.

7. The drive unit of claim 1 , wherein the actuator includes a manifold that is provided integrally with the cylinder and in which a hydraulic circuit is defined,

wherein the attachment includes a first hydraulic connector disposed at a first end of a flow path defined inside the attachment and a second hydraulic connector disposed at a second end of the flow path, the first hydraulic connector is connected with a hydraulic pipe outside the attachment, and

wherein the actuator includes an actuator-side hydraulic connector that is connected to the second hydraulic connector of the attachment when the attachment is coupled to the cylinder, and the actuator includes therein a passage that connects the actuator-side hydraulic connector and the hydraulic circuit.

8. The drive unit of claim 7 , wherein the second hydraulic connector includes a flow path defined therein, an attachment switching valve is provided in the flow path in the second hydraulic connector, the attachment switching valve opens the flow path in the second hydraulic connector when the attachment is coupled to the cylinder and closes the flow path in the second hydraulic connector when the attachment is separated from the cylinder, and

wherein the actuator-side hydraulic connector includes a flow path defined therein, an actuator switching valve is provided in the flow path in the actuator-side hydraulic connector, the actuator switching valve opens the flow path in the actuator-side hydraulic connector when the attachment is coupled to the cylinder and closes the flow path in the actuator-side hydraulic connector when the attachment is separated from the cylinder.

9. The drive unit of claim 7 , wherein an outer surface of the attachment has a pair of cylindrical protrusions,

wherein the pair of cylindrical protrusions are disposed on opposite sides of an axis of the cylinder,

wherein the reaction link has a pair of leg portions, a first leg portion from the pair of leg portions swings about a first cylindrical protrusion from the pair of cylindrical protrusions, and a second leg portion from the pair of leg portions swings about a second cylindrical protrusion from the pair of cylindrical protrusions,

wherein the first hydraulic connector is disposed on an end surface of the protrusion on a tip side, and

wherein a part of the flow path is defined inside the cylindrical protrusion.