| 摘要 |
A temperature-sensitive actuator particularly for varying the pitch of blades spaced around a cooling fan hub. The actuator, as applied to a fan, includes at least first and second circular or part-circular elongate members within the hub, restraining means on the hub for one end of the first elongate member, support means for the first elongate member having a coefficient of expansion different from that of the first elongate member, and which inhibits radial deformation of the first elongate member during thermal expansion or contraction whereby the free end of the first elongate member moves circumferentially, means for transmitting movement of the first elongate member to the second elongate member, and further means between the second elongate member and the blades to vary the pitch of the blades in response to the combined thermal expansion or contraction of the elongate members. |
