Throttle device

A throttle device (1) which prevents the entry of foreign compounds into a slidable contact portion between a brush (45) and a commutator (44) is provided to prevent the malfunctioning of a motor (30). A first shielding portion (55) is integrally formed in a brush holder (50), which is attached to a yoke (40) of a motor (30) for holding a brush (45). The plate-shaped first shielding portion (55) covers the vicinity of the yoke (40) in the outer periphery of the yoke (40). Accordingly, the first shielding portion (55) covers a gap left between the yoke (40) and the brush holder (50), and a slidable contact portion (46) between a commutator (44) and the brush (45) on a throttle gear side. Therefore, the first shielding portion (55) prevents a foreign compound, generated in an engagement portion between the throttle gear (21) and a reduction gear (22) and falling onto a motor (30), from moving to the slidable contact portion (46), so that it is possible to prevent poor contact between the commutator (44) and the brush (45). A throttle device (1) which prevents the entry of foreign compounds into a slidable contact portion between a brush (45) and a commutator (44) is provided to prevent the malfunctioning of a motor (30). A first shielding portion (55) is integrally formed in a brush holder (50), which is attached to a yoke (40) of a motor (30) for holding a brush (45). The plate-shaped first shielding portion (55) covers the vicinity of the yoke (40) in the outer periphery of the yoke (40). Accordingly, the first shielding portion (55) covers a gap left between the yoke (40) and the brush holder (50), and a slidable contact portion (46) between a commutator (44) and the brush (45) on a throttle gear side. Therefore, the first shielding portion (55) prevents a foreign compound, generated in an engagement portion between the throttle gear (21) and a reduction gear (22) and falling onto a motor (30), from moving to the slidable contact portion (46), so that it is possible to prevent poor contact between the commutator (44) and the brush (45).