초록 ▼

An assembly for changing the pitch of fan blades rotatably attached to a hub includes a main drive shaft configured to rotate the hub. The main drive shaft is rotated by a first motor. A secondary drive shaft is coupled to the main drive shaft via a gearing system located within the hub. The seconda

An assembly for changing the pitch of fan blades rotatably attached to a hub includes a main drive shaft configured to rotate the hub. The main drive shaft is rotated by a first motor. A secondary drive shaft is coupled to the main drive shaft via a gearing system located within the hub. The secondary drive shaft is also driven by a second motor. When driven by the second motor, the secondary drive shaft manipulates the gearing system to alter the pitch of the fan blades.

대표청구항 ▼

1. A fan blade pitch change mechanism comprising: a first drive shaft configured to rotate a fan hub;an actuator shaft coupled to a gear system disposed within the fan hub;the actuator shaft configured to alter a blade pitch of a fan blade attached to the fan hub via the gear system;a first motor at

1. A fan blade pitch change mechanism comprising: a first drive shaft configured to rotate a fan hub;an actuator shaft coupled to a gear system disposed within the fan hub;the actuator shaft configured to alter a blade pitch of a fan blade attached to the fan hub via the gear system;a first motor attached to the first drive shaft;the first motor configured to rotate the first drive shaft;a second motor attached to the actuator shaft; andthe second motor configured to rotate the actuator shaft;wherein the actuator shaft is disposed within the first drive shaft and the actuator shaft rotates with the first drive shaft,wherein the actuator shaft acts as a drive shaft to rotate the second motor when the actuator shaft rotates with the first drive shaft. 2. The fan assembly according to claim 1, wherein the second motor is coupled to the first drive shaft via the gear system. 3. The fan assembly according to claim 1, wherein the second motor rotates according to the rotation of the first drive shaft. 4. The fan assembly according to claim 1, wherein at least one of the first motor and the second motor comprise an electric motor. 5. The fan assembly according to claim 1, wherein the actuator shaft is disposed within the first drive shaft. 6. The fan assembly according to claim 5, wherein the actuator shaft extends from the second motor, through the first drive shaft, and into the fan hub. 7. The fan assembly according to claim 5, wherein a bearing is disposed between the actuator shaft and the first drive shaft. 8. A fan comprising: a hub;a fan blade rotatably attached to the hub via a blade gear;a pitch change gear disposed within the hub and operatively connected to the blade gear;a first motor attached to the hub via a main drive shaft;the main drive shaft configured to rotate the hub;a second motor attached to the pitch gear via a secondary drive shaft;the secondary drive shaft configured to change a blade pitch of the fan blade by rotating the pitch change gear;wherein the secondary drive shaft is disposed within the main drive shaft and the secondary drive shaft rotates with the main drive shaft;wherein the secondary drive shaft directly drives the second motor when the secondary drive shaft rotates with the main drive shaft. 9. The fan according to claim 8, wherein the secondary drive shaft is disposed within the main drive shaft. 10. The fan according to claim 8, wherein the second motor is configured to rotate the secondary drive shaft. 11. The fan according to claim 8, wherein the second motor rotates according to the rotation of the main drive shaft. 12. The fan according to claim 8, wherein the pitch change gear comprises a crown gear. 13. The fan according to claim 12, wherein the blade gear comprises a crown gear operatively engaged with the pitch change gear. 14. The fan according to claim 8, wherein the fan is configured to be incorporated into a cooling system. 15. The fan according to claim 14, wherein the cooling system is disposed in a motor vehicle. 16. A cooling system for a motor vehicle comprising: a radiator;a variable pitch fan including a hub,a fan blade rotatably attached to the hub via a blade gear,a pitch change gear disposed within the hub and operatively connected to the blade gear,a first driver attached to the hub via a main drive shaft,the main drive shaft configured to rotate the hub,a second driver attached to the pitch gear via a secondary drive shaft, andthe secondary drive shaft configured to change a blade pitch of the fan blade by rotating the pitch change gear;wherein the secondary drive shaft is disposed within the main drive shaft and the secondary drive shaft rotates with the main drive shaft;wherein the secondary drive shaft rotates the second driver when the secondary drive shaft rotates with the main drive shaft; anda control system configured to control the operation of the fan. 17. The cooling system of claim 16, wherein the control system is configured to send a signal to the first motor to manipulate a rotational speed of the hub. 18. The cooling system of claim 16, wherein the control system is configured to send a signal to the second motor to manipulate the pitch of the fan blade. 19. The cooling system of claim 16, wherein the first and second drivers are electric motors. 20. The cooling system of claim 16, wherein the second driver is configured to rotate the secondary drive shaft.