An auxiliary machine-driving device is provided for a vehicle. The auxiliary machine-driving device has a first roller, a second roller, a third roller, a fourth roller and a fifth roller. The first roller rotates integrally with a rotary shaft of an engine. The second roller rotates integrally with a rotary shaft of a motor/generator. The third roller rotates integrally with a rotary shaft of an auxiliary machine. The fourth roller is provided between the first roller and the second roller. The fifth roller that always contacts the second roller and the third roller. The actuator switches the fourth roller between a contact state with the first and second rollers and a separation state from the first and second rollers.

An auxiliary machine-driving device is provided for a vehicle. The auxiliary machine-driving device has a first roller, a second roller, a third roller, a fourth roller and a fifth roller. The first roller rotates integrally with a rotary shaft of an engine. The second roller rotates integrally with a rotary shaft of a motor/generator. The third roller rotates integrally with a rotary shaft of an auxiliary machine. The fourth roller is provided between the first roller and the second roller. The fifth roller that always contacts the second roller and the third roller. The actuator switches the fourth roller between a contact state with the first and second rollers and a separation state from the first and second rollers.

An auxiliary machine-driving device is provided for a vehicle. The auxiliary machine-driving device has a first roller, a second roller, a third roller, a fourth roller and a fifth roller. The first roller rotates integrally with a rotary shaft of an engine. The second roller rotates integrally with a rotary shaft of a motor/generator. The third roller rotates integrally with a rotary shaft of an auxiliary machine. The fourth roller is provided between the first roller and the second roller. The fifth roller that always contacts the second roller and the third roller. The actuator switches the fourth roller between a contact state with the first and second rollers and a separation state from the first and second rollers.

A magnetic gear may comprise a first gear member comprising a plurality of permanent magnets arranged to have a first number of magnetic pole pairs and a second gear member positioned relative to the first gear member. The second gear member may comprise a plurality of individually rotatable magnetized elements each driven and synchronized with one another to selectively generate a second number of magnetic pole pairs that differs from the first number of magnetic pole pairs. The magnetic gear may further comprise a plurality of interpole elements positioned between the first and second gear members. The plurality of interpole elements may be disposed to harmonically couple the magnetic pole pairs of the first gear member with the magnetic pole pairs of the second gear member for each selectively generated second number of magnetic pole pairs.

A magnetic gear may comprise a first gear member comprising a plurality of permanent magnets arranged to have a first number of magnetic pole pairs and a second gear member positioned relative to the first gear member. The second gear member may comprise a plurality of individually rotatable magnetized elements each driven and synchronized with one another to selectively generate a second number of magnetic pole pairs that differs from the first number of magnetic pole pairs. The magnetic gear may further comprise a plurality of interpole elements positioned between the first and second gear members. The plurality of interpole elements may be disposed to harmonically couple the magnetic pole pairs of the first gear member with the magnetic pole pairs of the second gear member for each selectively generated second number of magnetic pole pairs.