| 摘要 |
A valve timing adjusting apparatus for an engine includes a casing, magnetorheological fluid, a control device, a brake rotor, a phase adjustment mechanism, and a sealing structure. The control device changes the degree of viscosity of magnetorheological fluid in the casing. The sealing structure seals a gap between the casing and the brake rotor. The sealing structure includes an annular permanent magnet and at least one annular magnetic flux guide. The at least one magnetic flux guide defines a guide gap between the at least one magnetic flux guide and the other one of the casing and the brake rotor. The direction of magnetic flux relative to an axial center of the brake rotor, which flux is generated by the control device is similar to a direction of magnetic flux relative to the axial center generated by the permanent magnet.
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