Motion conversion device and power generation device including the same

A motion conversion device comprising:

• a planetary gear mechanism including a ring gear being a stationary internal gear, a planetary gear that meshes with the ring gear, and a carrier that rotatably supports the planetary gear;
• a crank member that is disposed in such a way as to extend in a planetary gear radial direction orthogonal to a planetary gear axis serving as a rotation axis of the planetary gear and coupled to the planetary gear in such a way as to rotate in an integrated manner;
• an input member that is supported by the crank member and disposed on an input axis spaced apart from the planetary gear axis in the planetary gear radial direction;
• and
• an output member that is coupled to a specific rotatable member that rotates in conjunction with the carrier, the specific rotatable member being a member other than the planetary gear, wherein
• a radius of the ring gear is twice as large as that of the planetary gear,
• a direction along a carrier axis serving as a rotation axis of the carrier is an axial direction and a direction orthogonal to the carrier axis is a radial direction,
• a first planetary bearing and a second planetary bearing that support the planetary gear rotatably with respect to the carrier are respectively disposed on one side and another side of the axial direction with respect to a tooth section of the planetary gear,
• a first carrier bearing and a second carrier bearing that support the carrier rotatably with respect to the ring gear are respectively disposed on one side and another side of the axial direction with respect to a tooth section of the ring gear,
• the first carrier bearing is disposed in such a way as to overlap, when viewed along the radial direction, a movement trajectory of the first planetary bearing being generated when the planetary gear revolves, and
• the second carrier bearing is disposed in such a way as to overlap, when viewed along the radial direction, a movement trajectory of the second planetary bearing being generated when the planetary gear revolves, wherein
• the ring gear includes a first supporting section and a second supporting section that respectively extend to one side and another side of the axial direction with respect to the tooth section of the ring gear,
• the first supporting section supports the first carrier bearing from outside in the radial direction and is disposed in such a way as to overlap, when viewed along the radial direction, the movement trajectory of the first planetary bearing being generated when the planetary gear revolves, and
• the second supporting section supports the second carrier bearing from outside in the radial direction and is disposed in such a way as to overlap, when viewed along the radial direction, the movement trajectory of the second planetary bearing being generated when the planetary gear revolves.

A motion conversion device comprising:

• a planetary gear mechanism including a ring gear being a stationary internal gear, a planetary gear that meshes with the ring gear, and a carrier that rotatably supports the planetary gear;
• a crank member that is disposed in such a way as to extend in a planetary gear radial direction orthogonal to a planetary gear axis serving as a rotation axis of the planetary gear and coupled to the planetary gear in such a way as to rotate in an integrated manner;
• an input member that is supported by the crank member and disposed on an input axis spaced apart from the planetary gear axis in the planetary gear radial direction;
• and
• an output member that is coupled to a specific rotatable member that rotates in conjunction with the carrier, the specific rotatable member being a member other than the planetary gear, wherein
• a radius of the ring gear is twice as large as that of the planetary gear,
• a direction along a carrier axis serving as a rotation axis of the carrier is an axial direction and a direction orthogonal to the carrier axis is a radial direction,
• a first planetary bearing and a second planetary bearing that support the planetary gear rotatably with respect to the carrier are respectively disposed on one side and another side of the axial direction with respect to a tooth section of the planetary gear,
• a first carrier bearing and a second carrier bearing that support the carrier rotatably with respect to the ring gear are respectively disposed on one side and another side of the axial direction with respect to a tooth section of the ring gear,
• the first carrier bearing is disposed in such a way as to overlap, when viewed along the radial direction, a movement trajectory of the first planetary bearing being generated when the planetary gear revolves, and
• the second carrier bearing is disposed in such a way as to overlap, when viewed along the radial direction, a movement trajectory of the second planetary bearing being generated when the planetary gear revolves, wherein
• the ring gear includes a first ring gear and a second ring gear that are disposed at different positions in the axial direction,
• the planetary gear includes a first planetary gear that meshes with the first ring gear and a second planetary gear that meshes with the second ring gear, and
• the first planetary gear and the second planetary gear are helical gears having tooth flanks being shaped in such a way that thrust force along the axial direction acting on the tooth flanks of each of the planetary gears is in directions opposite to each other.

A power generation device comprising:

• a motion conversion device comprising:
• a planetary gear mechanism including a ring gear being a stationary internal gear, a planetary gear that meshes with the ring gear, and a carrier that rotatably supports the planetary gear;
• a crank member that is disposed in such a way as to extend in a planetary gear radial direction orthogonal to a planetary gear axis serving as a rotation axis of the planetary gear and coupled to the planetary gear in such a way as to rotate in an integrated manner;
• an input member that is supported by the crank member and disposed on an input axis spaced apart from the planetary gear axis in the planetary gear radial direction;
• and
• an output member that is coupled to a specific rotatable member that rotates in conjunction with the carrier, the specific rotatable member being a member other than the planetary gear, wherein
• a radius of the ring gear is twice as large as that of the planetary gear,
• a direction along a carrier axis serving as a rotation axis of the carrier is an axial direction and a direction orthogonal to the carrier axis is a radial direction,
• a first planetary bearing and a second planetary bearing that support the planetary gear rotatably with respect to the carrier are respectively disposed on one side and another side of the axial direction with respect to a tooth section of the planetary gear,
• a first carrier bearing and a second carrier bearing that support the carrier rotatably with respect to the ring gear are respectively disposed on one side and another side of the axial direction with respect to a tooth section of the ring gear,
• the first carrier bearing is disposed in such a way as to overlap, when viewed along the radial direction, a movement trajectory of the first planetary bearing being generated when the planetary gear revolves, and
• the second carrier bearing is disposed in such a way as to overlap, when viewed along the radial direction, a movement trajectory of the second planetary bearing being generated when the planetary gear revolves;
• and
• an internal-combustion engine including a cylinder, a piston that reciprocates inside the cylinder, and a connecting rod coupled to the piston;
• and
• a rotating electric machine including a stator and a rotor, wherein
• the crank member is relatively rotatably coupled to the connecting rod through the input member,
• the output member is coupled to the rotor in such a way as to rotate in an integrated manner, and
• the motion conversion device is disposed on an inside in the radial direction with respect to the stator and at a position where the motion conversion device overlaps the stator when viewed along the radial direction.