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US 4,047,836 AGranted
Phase change means for a power driven device, such as a fan
AssigneeThe Budd Company
InventorJohn A. Germer
Life of this patent
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Abstract
This application discloses means for driving a device, such as a cooling fan of a vehicle motor, together with means for changing the phase relationship of an element moving with the driven device whereby to change the effect of the driven device; in a specific application, to change the pitch of cooling fan blades in response to the requirements of the motor; the phase change being effected by changing the angular relationship of an auxiliary adjusting shaft which is being positively driven while maintaining the main fan shaft drive means unchanged.
Claims3
A fan for moving air to provide variable cooling comprising,
- a fan hub and a pitch control hub disposed to be rotated about the same axis and at the same speed,
- a plurality of fan blades mounted to said fan hub to permit pivotal movement of said fan blades to vary the pitch thereof,
- at least one linkage connected between one of said fan blades and said pitch control hub,
- a first pulley belt mounted on a first pair of pulley wheels,
- a drive shaft connected to a first one of said first pair of pulley wheels to drive said fan hub,
- a second pulley belt mounted on a second pair of pulley wheels,
- said second pulley belt including slack portions normally held under tension,
- said pitch control hub being attached to a first one of said second pair of pulley wheels to drive said pitch control hub,
- means for driving said first and second pulley belts through second ones of said pulley wheels,
- a sleeve member slideably mounted on said drive shaft for fixedly holding said first one of said second pair of pulley wheels and said pitch control hub to permit varying the phase relationship between said pitch control hub and said fan hub,
- transducer means responsive to temperature changes connected to move the slack portions of said second pulley belt to cause said sleeve member with said first one of said pulley wheels and said pitch control hub to be moved,
- whereby a change in the angular positions of said at least one linkage changes the pitch of said plurality of fan blades.
9 more elements
Dependencies are inferred from the claim text.