Electric booster device

Application Number  00128422 Application Date  2000.10.13
Publication Number  1293139 Publication Date  2001.05.02
Priority Information   1999/10/13 JP 290743/1999; 1999/10/13 JP 290843/1999  
Applicant(s) Name  Honda Giken Kogko K.K.  
Inventor(s) Name  Isoarashi Masashi;Yahagi Kunio;Ise Hiromitsuru  
Patent Agency Code  11038 Patent Agent  ma jiangli
AbstractThe invention provides a motor-driven assist unit capable of enhancing the cooling performance of a control board contained in the unit and also of lowering the center of gravity of the unit, and shortening the lengths of a signal line and a power supply line. The motor-driven assist unit contains an electric motor for generating an assist-power in response to a leg-power inputted to a crank shaft and a control board or control unit for controlling the electric motor, wherein the assist-power and the leg-power are synthesized and the resultant power is transmitted to a drive wheel. The motor-driven assist unit is characterized in that the control board is located at a position offset forwardly, downwardly from the crank shaft in a posture of the motor-driven assist unit mounted on a body frame, and that at least a rotation sensor for detecting the rotational speed of the crank shaft is mounted on the control board, and the control board is disposed near a rotor rotated in synchronization with the crank shaft in such a manner that a positional relationship between the rotation sensor and the rotor is kept at a predetermined relation.