| 摘要 |
<p>Even when a cheap magnetic responsive element is used for a magnetic detecting portion, a rotation detector excellent in vibration resistance is provided, a housing (1) being provided with a tubular insertion portion (1a) through which an axle (13) is inserted. A rotor (5) is provided with a cylindrical portion (5a) through which the insertion portion (1a) is inserted and that has a plurality of magnetic poles and rotates synchronously with a front wheel (wheel) (11) fitted to the axle (13). The magnetic detecting portion (rotation detecting portion) (3) detects a change of magnetic poles accompanying the rotation of the cylindrical portion (5a). A spacer (magnetic member) (4) is disposed in the surroundings of the insertion portion (1a) of a bottom portion (1g) of the housing (1), and holds the rotor (5) at the bottom portion (1g) when the cylindrical portion (5a) is fitted into the insertion portion (1a).
To reduce vibration caused errors, a projection or protrusion is arranged on the rotation transmitting portion on the rotor or on a rotation-biasing portion on the hub.
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