Control mechanism
A control mechanism for an aircraft includes: a conversion mechanism having a translatable part and a rotatable part, the translatable part being reversibly translatable and being connectable to an inceptor; an inceptor connector connected to the translatable part of the conversion mechanism; a differential device connected to the rotatable part of the conversion mechanism, the conversion mechanism being configured to reversibly convert translational motion of the inceptor connector to rotational motion of the differential device; an adjustment member connected to the differential device; and a control member connected to the differential device; wherein the differential device is configured such that the adjustment member is maintainable in position during an aircraft control process to permit: translation of the inceptor connector from a translational neutral position; and corresponding movement of the control member, to control the aircraft through the differential device.
1. A control mechanism for an aircraft, the control mechanism comprising:
a conversion mechanism having a translatable part and a rotatable part, the translatable part being reversibly translatable;
an inceptor connector connected to the translatable part of the conversion mechanism;
a differential device connected to the rotatable part of the conversion mechanism, the conversion mechanism being configured to convert translational motion of the inceptor connector to rotational motion of the differential device;
an adjustment member connected to the differential device; and
a control member connected to the differential device;
wherein the differential device is configured such that the adjustment member is maintainable in position during an aircraft control process to permit:
translation of the inceptor connector from a translational neutral position; and
corresponding movement of the control member to control the aircraft through the differential device; and
wherein the differential device is configured such that the control member is maintainable in position during an adjustment process to permit:
translation of the inceptor connector; and
corresponding movement of the adjustment member through the differential device to adjust the translational neutral position.
2. The control mechanism as claimed in claim 1 , further comprising:
an adjustment member maintaining device, wherein the adjustment member maintaining device is configured to, during the aircraft control process, resist movement of the adjustment member; and
a control member maintaining device, the control member maintaining device being configured to, during the adjustment process, resist movement of the control member.
3. The control mechanism as claimed in claim 2 , wherein the adjustment member maintaining device is configured to, during the adjustment process, provide discrete positioning of the inceptor connector on the conversion mechanism to allow variation of the translational neutral position.
4. The control mechanism as claimed in claim 3 , wherein the control member maintaining device comprises a control member locking device configured to, during the adjustment process, lock movement of the control member.
5. The control mechanism as claimed in claim 1 , wherein the control member is rotatable during an aircraft control process, and the adjustment member is rotatable during an adjustment process.
6. The control mechanism as claimed in claim 1 , wherein the differential device comprises an epicyclic gear train.
7. The control mechanism as claimed in claim 6 , wherein the epicyclic gear train comprises:
a sun gear, wherein the rotatable part of the conversion mechanism is coupled to the sun gear such that the rotatable part of the conversion mechanism rotates with the sun gear.
8. The control mechanism as claimed in claim 7 , wherein the epicyclic gear train comprises a carrier, wherein the control member is coupled to the carrier such that the carrier rotates with the control member during the aircraft control process.
9. The control mechanism as claimed in claim 6 , wherein the epicyclic gear train comprises a ring gear, wherein the adjustment member is coupled to the ring gear such that the ring gear rotates with the adjustment member during the adjustment process.
10. The control mechanism as claimed in claim 1 , wherein the conversion mechanism is configured to be inclined relative to a longitudinal axis of an aircraft when installed on the aircraft.
11. The control mechanism as claimed in claim 1 , wherein the translatable part of the conversion mechanism is a nut and the rotatable part of the conversion mechanism is a screw, the differential device being actuatable to rotate the screw, upon translation of the inceptor connector.
12. The control mechanism as claimed in claim 1 , further comprising a guiding mechanism, the guiding mechanism configured to maintain an orientation of the inceptor connector during translation of the inceptor connector.
13. The control mechanism as claimed in claim 1 , further comprising:
a stop configured to prevent movement of the control member when the inceptor connector reaches a maximum translation distance during the aircraft control process.
14. A bilateral control mechanism comprising:
a first control mechanism; and
a second control mechanism;
wherein the first and second control mechanisms are each as claimed in claim 1 .
15. A bilateral control mechanism as claimed in claim 14 , wherein the differential device of the first control mechanism and the differential device of the second mechanism are synchronised such that:
on translation of the inceptor connector of the first control mechanism during the aircraft control process the inceptor connector of the second control mechanism translates in an opposing direction to the inceptor connector of the first control mechanism; and
on translation of the inceptor connector of the first control mechanism during the adjustment process the inceptor connector of the second control mechanism translates in the same direction as the inceptor connector of the first control mechanism.
16. A bilateral control mechanism as claimed in claim 15 , wherein the control member of the first control mechanism and the control member of the second control mechanism are the same control member; and/or
wherein the adjustment member of the first control mechanism and the adjustment member of the second control mechanism are the same adjustment member; and/or
wherein the differential device of the first control mechanism and the differential device of the second control mechanism are the same differential device.