DRIVE UNIT OF BICYCLE WITH AUXILIARY POWER

• Main Authors: TAMURA YOSHITAKA, SATO SUSUMU, FURUKAWA TOSHIHARU, NISHIMURA RITSUO, SHIMADA NOBUAKI
• Format: Patent
• Language: English
• Published: 31.03.1998
• Edition: 6
• Subjects: CYCLES; LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS; PERFORMING OPERATIONS; POWERED PROPULSION OF SLEDGES OR; RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES; TRANSPORTING

PROBLEM TO BE SOLVED: To reduce the extent of vibration and noise in a reduction gear part on the motor side without adopting any expansive planetary roller type reduction gear by setting up both axes of an auxiliary power motor and a crankshaft almost parallelly, and converting a first stage geared transmission device of the motor into a belt transmission device. SOLUTION: An auxiliary power motor 15 sets up an axis of its driving shaft 15a in parallel with that of a crankshaft 5, and a geared transmission shaft 32, etc., are installed each in space between this shaft 15a and the crankshaft 5 in parallel with this crankshaft 5. In addition, a small diametral timing belt pulley 38 is attached tight to the shaft 15a of the motor 15, while a large diametral timing belt pulley 40 is installed in the shaft 32 via a one-way clutch 39, and a timing belt 41 is laid across these pulleys 38 and 40. Both these axes of the auxiliary driving motor and the crankshaft are almost parallely set up, and further a geared transmission device at the first stage of the motor is converted into a belt transmission device, so that there is less in noise occurring.