A series elastic actuator includes a gear configured to rotate, a mounting recess formed on a first surface of the gear, a plurality of elastic bodies configured to be received in the mounting recess that are made of a non-metal elastic material and spaced apart from each other in a circumferential direction, an output body configured to cover the first surface of the gear, and at least one insertion portion configured to protrude from the output body to be inserted between a pair of adjacent elastic bodies or inserted through the elastic bodies.

An elastic actuator includes a gear transmitting a rotational force; a mounting recess formed in a first side of the gear; a plurality of elastic wedges received in the mounting recess at positions that are spaced apart from each other in a circumferential direction of the mounting recess, each elastic wedge including a non-metal elastic material; a through-hole penetrating an elastic wedge among the plurality of elastic wedges; an output body configured to cover the first side of the gear; and at least one insertion bar protruding from a first side of the output body toward the first side of the gear and configured to be inserted into the through-hole. The elastic actuator further includes a shaft coupled to the output body and penetrating the gear, a protrusion having an inner space through which the shaft passes being formed to extend from the mounting recess toward the output body.

A series elastic actuator includes a gear configured to rotate, a mounting recess formed on a first surface of the gear, a plurality of elastic bodies configured to be received in the mounting recess that are made of a non-metal elastic material and spaced apart from each other in a circumferential direction, an output body configured to cover the first surface of the gear, and at least one insertion portion configured to protrude from the output body to be inserted between a pair of adjacent elastic bodies or inserted through the elastic bodies.

A flexplate includes a disc body having an inner radial portion, an outer radial portion, and a contoured profile extending between the inner radial portion and the outer radial portion. The contoured profile tapers between the inner radial and outer radial portions such that the contoured profile tapers along a radial extent of the contoured profile. Drivetrains and methods of making flexplates for drivetrains are also described.

A series elastic actuator includes a gear configured to rotate, a mounting recess formed on a first surface of the gear, a plurality of elastic bodies configured to be received in the mounting recess that are made of a non-metal elastic material and spaced apart from each other in a circumferential direction, an output body configured to cover the first surface of the gear, and at least one insertion portion configured to protrude from the output body to be inserted between a pair of adjacent elastic bodies or inserted through the elastic bodies.

A vibration isolating structure for a power unit. The power unit includes an internal combustion engine equipped with transmissions. The vibration isolation structure includes torque dampers disposed between transmission gears of the transmission and a power transmission shaft supporting the transmission gears.

A coupling unit includes an output gear, a coupling and a rubber cushion. A second rotatable shaft portion of the coupling includes a resilient projection that projects outwardly in a radial direction from an outer peripheral surface of the second rotatable shaft portion. The resilient projection is resiliently inwardly deformed in the radial direction during movement of the resilient projection along a deep side of a recessed groove of a through-hole formed in a first rotatable shaft portion of the output gear at a time of fitting the second rotatable shaft portion into the through-hole. When the resilient projection projects from the through-hole, the resilient projection is resiliently outwardly restored and is engaged to an engaging portion of the first rotatable shaft portion to limit removal of the second rotatable shaft portion from the through-hole.