ATTACHMENT FOR ROTARY ACTUATOR TO WING

Abstract

A rotary actuator mounting system configured to attach a rotary actuator to and between two relatively moveable parts, the rotary actuator being attached to a first of the two relatively moveable parts and to a second of the relatively moveable parts such that operation of the actuator causes one of the first and second relatively movable parts to rotate relative to the other of the first and second relatively movable parts about an axis of the rotary actuator. The system includes a compliant attachment component connecting the actuator to the first relatively moveable part, the compliant attachment component having a first end attached to the first movable part and a second end attached to the actuator, and wherein at least one of the first and the second end is in the form of a ball bearing arranged to be received in a complementary socket on the actuator and/or the first movable part.

Claims

1. A rotary actuator mounting system configured to attach a rotary actuator to and between two relatively moveable parts, the rotary actuator being attached to a first of the two relatively moveable parts and to a second of the relatively moveable parts such that operation of the actuator causes one of the first and second relatively movable parts to rotate relative to the other of the first and second relatively movable parts about an axis of the rotary actuator, the system comprising: a compliant attachment component connecting the actuator to the first relatively moveable part, the compliant attachment component having a first end attached to the first movable part and a second end attached to the actuator, wherein at least one of the first and the second end is in the form of a ball bearing arranged to be received in a complementary socket on the actuator and/or the first movable part.

2. The rotary actuator mounting system of claim 1, wherein both the first end and the second end is a ball bearing.

3. The rotary actuator mounting system of claim 1, wherein the rotary actuator comprises one or more earth members and wherein the first end of the attachment component is attached to an earth member.

4. The rotary actuator mounting system of claim 1, wherein the compliant attachment component comprises two compliant attachment components, wherein a first compliant attachment component is attached between a first location of the actuator and a first side of the first relatively movable part and a second compliant attachment component is attached between a second location of the actuator and a second side of the first relatively movable structure.

5. The rotary actuator mounting system of claim 4, wherein the actuator comprises a first earth member at the first location, to which the first compliant attachment component is attached, and a second earth member at the second location, to which the second compliant attachment component is attached.

6. The rotary actuation mounting system of claim 1, wherein the rotary actuator comprises an output rotor attached to the second relatively moveable part.

7. The rotary actuation mounting system of claim 1, wherein the rotary actuator is a rotary geared actuator.

8. An aircraft wing comprising: a main wing body part; a second wing part movable relative to the main wing body part; and a rotary actuator mounting system as claim in claim 1 arranged to mount the rotary actuator to one of the main wing body part and the second wing part to cause rotation of the second wing part relative to the main wing body part.

9. An aircraft wing as claimed in claim 8, wherein the actuator is mounted to the main wing body part.

10. An aircraft wing as claimed in claim 8, wherein the second wing part is a wing tip.

Description

BRIEF DESCRIPTION

[0011] Examples according to the disclosure will now be described in more detail with reference to the drawings. These are examples only, and variations are possible within the scope of the claims.

[0012] FIG. 1 is a planar view of a geared rotary actuator mounted to a wing structure using conventional attachment.

[0013] FIG. 2 is a planar view of a geared rotary actuator mounted to a wing structure using an attachment according to the disclosure.

[0014] Whilst the attachment according to the disclosure will be described for mounting a rotary geared actuator to an aircraft wing with a foldable tip, for moving the wing tip relative to the main body of the wing, this is but one example of where the attachment of the disclosure can be used. The attachment can be used to mount other types of actuators and also between other pairs of relatively moveable surfaces.

DETAILED DESCRIPTION

[0015] FIG. 1 shows a rotary actuator 10 positioned between and attached to two relatively moveable wing parts 1,2. The actuator is located on the first part 1 which, in this example, is the main body of the aircraft wing. The actuator can be any known type of rotary actuator having a stator part and a rotor part. Input rotation is provided to the actuator (not shown) by a drive means such as a motor. This causes rotation of the gears of the actuator which result in rotation of the rotor 11. The rotor 11 is fixed to the second relatively movable part which may be, e.g. a foldable wing tip. The actuator operation is known in the art and will not be described in any detail. The drawing is schematic only. Different types of rotary actuator are possible. With a geared actuator, as shown, the gears of the actuator operate such that the output rotor 11 rotates in response to, but at a different speed to the input rotation to cause relative rotation of the other part 2, to which the output rotor 11 is attached.

[0016] In a conventional arrangement, the actuator is mounted to the first relatively moveable part 1 via earth members 12 on the actuator. The earth members around the body of the actuator are secured to the wing part 1 in any known way by a fixed fastener such as a bolt or trunnion mount 13 attached to the earth member by an external housing (not shown). A trunnion mount provides rotational and axial degrees of freedom but does not allow for any twisting of the structural parts relative to the actuator assembly.

[0017] As mentioned above, deflections (shown by the arrows in FIG. 1) in the wing parts 1,2 due to e.g. wind bending and/or unequal thermal expansion will be transferred to the attached actuator causing damage and/or affecting its operation.

[0018] In the attachment design according to the disclosure, an example of which is shown in FIG. 2, the fixed mounting to the wing parts is replaced by a compliant attachment 30 between the actuator 10 and the first relatively movable part 1. The same reference numerals are used as FIG. 1 for the same parts. The compliant attachment 30 comprises an elongate body portion 300, a first end 301 and a second end 302.

[0019] The first end 301 is arranged to attach to the first relatively movable part 1 and the second end 302 is arranged to attach to the actuator e.g. at the earth member 12. The compliant attachment 30 is designed to accommodate relative movement between the wing part and the actuator whilst retaining a secure attachment between the two.

[0020] At least one of the two ends 301,302 is in the form of a ball or spherical bearing that can be rotatably received in a complementary socket (not shown) provided on the wing/actuator part to which that end is attached. In the example shown, both ends 301 and 302 are formed as spherical bearings able to form a rotatable attachment to both the wing part and the actuator to allow some relative movement between the attachment and the parts, thus allowing there to be some relative movement between the wing part and the actuator. In this way, deflections of the wing or expansion movement will not be directly transferred to the actuator as they will be taken up by movement of the attachment. It is also feasible that only one of the ends is formed as a ball bearing. The other end could be attached to the wing/actuator in the conventional manner.

[0021] The attachment, therefore, allows the actuator to be securely mounted to the wing structure but isolates the actuator from wing bending forces and thermal expansion movement.

[0022] Any number of compliant attachments may be provided to attach the earth members 12 to the wing structure 1. The attachment can be attached directly to the earth members 12 without the need for external housings. In the example shown, two compliant attachments are provided—a first 30, attached to a first side 1 of the wing and a second, 30′ attached to a second side 1′ of the wing.

[0023] The design of the attachment is such that it could be made to have adjustable length or size to allow for rigging to different systems.

[0024] Whilst FIG. 2 shows the actuator mounted to the main body of the wing and the rotor attached to the wing tip, it is also feasible that the actuator could be mounted, via the compliant attachment, to the wing tip and the rotor attached to the wing body 1.

[0025] The compliant attachment is a simple component that can be quickly and easily installed and removed, if necessary, for maintenance etc. The component can have reduced weight and complexity compared to conventional attachment structures.

[0026] While the present disclosure has been described with reference to an exemplary embodiment or embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the present disclosure. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the present disclosure without departing from the essential scope thereof. Therefore, it is intended that the present disclosure not be limited to the particular embodiment disclosed as the best mode contemplated for carrying out this present disclosure, but that the present disclosure will include all embodiments falling within the scope of the claims.