| 摘要 |
<p>A variable valve timing device uses only a reduction mechanism to transmit rotation of an electric motor to a camshaft. A reduction mechanism (5) for transmitting rotation of an output shaft (4) of an electric motor (3) to a camshaft (1) is configured such that rollers (9) held in pockets (10a) are made to be in rolling contact with an eccentric shaft section (4a) provided to the output shaft (4) and with an inner gear (8) provided to a circular tube section of a housing (7) integrated with a sprocket (2), and the above pockets (10a) are formed in a retainer section (10b) of an intermediate shaft (10) by dividing the retainer section (10b) at equal intervals at split points the number of which is less by one than the number of cam crests (8a) of the inner gear (8). The construction above allows, when the output shaft (4) is rotated one time, the rollers (9) to revolve by one pitch of the cam crests (8a) along the outer diameter surface of the eccentric shaft section (4a), and the revolution of the rollers (9) is transmitted to the camshaft (1) through the intermediate shaft (10).</p> |
