Company Filing History:
Years Active: 1990-2001
Title: Innovations by Yoshiharu Yokoyama
Introduction
Yoshiharu Yokoyama is a notable inventor based in Iwata, Japan. He has made significant contributions to the field of power-assisted bicycles, holding a total of 9 patents. His work focuses on enhancing the functionality and efficiency of pedal-operated vehicles.
Latest Patents
Yokoyama's latest patents include a sensor for bicycles with assist engines and a power-assisted bicycle. The sensor for the bicycle with an assist engine is designed for a gasoline engine power-assisted pedal-operated vehicle. It varies the amount of assist provided by the engine in response to the manual force applied by the operator to the pedal mechanism. To ensure smoother power assist, rapid changes in manual power application, particularly rapid reductions, are dampened in the engine response. Additionally, this system includes a disabling device that disconnects the engine from the vehicle propulsion system when the brakes are actuated. His power-assisted bicycle patent features several embodiments of prime mover-assisted pedal-operated vehicles. In these designs, both the prime mover and the pedal mechanism drive the rear wheel through a common transfer shaft, which is positioned vertically above the pedal-operated crankshaft axis to improve ground clearance and simplify construction. The transmission arrangement ensures that the prime mover transmission ratios are always in a step-down condition while the pedal-operated crankshaft drives the transfer shaft through a step-up transmission. Various embodiments of improved torque sensors are also utilized to provide a smooth transition and feel for the rider.
Career Highlights
Yokoyama is associated with Yamaha Hatsudoki Kabushiki Kaisha, a prominent company in the field of motorized vehicles. His innovative designs and patents have contributed to the advancement of bicycle technology, particularly in the realm of power assistance.
Collaborations
Yokoyama has collaborated with notable coworkers such as Shigeru Akiyama and Tsuyoshi Kamiya. Their combined efforts have led to the development of advanced technologies in the field of pedal-operated vehicles.
Conclusion
Yoshiharu Yokoyama's contributions to the field of power-assisted bicycles demonstrate his innovative spirit and commitment to enhancing transportation technology. His patents reflect a deep understanding of mechanics and user experience, making him a significant figure in the industry.