INTERNAL COMBUSTION ENGINE

WIPO Patent Application WO/2024/062841

A1

In order to realize an internal combustion engine capable of efficiently transmitting torque from a piston to an output shaft of a crank mechanism, a crank mechanism 14 of an internal combustion engine 10 has: a crank 21 having a crank pin 28; a movable member 22 that is movably connected to another end part of a connecting rod 13 and is rotatably connected to the crank pin 28; and a transmission mechanism 14 that includes a fixed gear 31 fixed to the movable member 22, and that transmits a rotation force of the crank 21 to the movable member 22 via the fixed gear 31 to thereby move the movable member 22 with respect to the connecting rod 13 and rotate the movable member 22 with respect to the crank 21. A second crank 22 is provided as the movable member 22. The second crank 22 has a sub-axis A3 as a rotation axis thereof with respect to the other end part 13b of the connecting rod 13. At the top dead center, the angle formed by the connecting rod 13 with respect to a straight line L3 extending from a rotation axis A1 of the crank 21 to the sub-axis A3 is in an angle range of 90°±70°. The distance between the axial center of a cylinder 11 for allowing the piston 12 to reciprocate and the center of the rotational movement of the crank pin 28 is longer than the distance between the center of the rotational movement and the axial center of the crank pin 28.

NAKAYAMA YOSHITAKA (JP)

PCT/JP2023/030850

March 28, 2024

August 28, 2023

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NAKAYAMA YOSHITAKA (JP)

F02B75/32; F16C3/06

JP2019027362A	2019-02-21
JP2008196358A	2008-08-28
JP2000080901A	2000-03-21
JP2008151152A	2008-07-03

OIKE Bunpei (JP)

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