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CN-110712743-B - Flap system, wing and aircraft

CN110712743BCN 110712743 BCN110712743 BCN 110712743BCN-110712743-B

Abstract

The invention relates to a flap system, a wing and an aircraft, the flap system (2) being used for driving a leading edge flap (28) between a retracted position and an extended position, the flap system (2) comprising a leading edge flap (28) having a first flap joint (34) and a second flap joint (36), a first scissor lever (8), a second scissor lever (24), a first connecting lever (18), and an actuator (48). An actuator (48) is coupled with the first scissor lever (8) or with the first connecting lever (18), wherein the first scissor lever (8) comprises a first support joint (14) for rotatably supporting the first scissor lever (8) on the first structure fixing point (10), and wherein the actuator (48), the first scissor lever (8), the second scissor lever (24) and the first connecting lever (18) are arranged to actively place the leading edge flap (28) from the retracted position into the extended position.

Inventors

  • Andreas grimminger
  • GIBBERT MARKUS
  • Bernhard Schliepf
  • Blarenko koskovic

Assignees

  • 空中客车德国运营有限责任公司

Dates

Publication Date
20260505
Application Date
20190710
Priority Date
20180712

Claims (12)

  1. 1. A flap system (2) for driving a leading edge flap (28) between a retracted position and an extended position, the flap system (2) comprising: a leading edge flap (28) having a first flap joint (34) and a second flap joint (36); A first scissor lever (8); a second scissor lever (24); A first connecting rod (18); A second connecting rod (30), and An actuator (48), Wherein the actuator (48) is coupled to the first connecting rod (18), Wherein the first scissor lever (8) comprises a first support joint (14) for rotatably supporting the first scissor lever (8) on a first structure fixing point (10), wherein an end of the first scissor lever (8) opposite to the first support joint (14) is coupled to the leading edge flap (28) by means of the second connecting rod (30), the second connecting rod (30) being rotatably supported to the first scissor lever (8) and rotatably supported to the first flap joint (34), Wherein the first connecting rod (18) comprises a second bearing joint (22) for rotatably supporting the first connecting rod (18) at a second structure fixing point (20), and wherein an end (26) of the first connecting rod (18) opposite to the second bearing joint (22) is rotatably coupled with an end of the second scissor lever (24), Wherein the end of the second scissor lever (24) opposite the end coupled to the first connecting lever (18) is coupled to the second flap joint (36), Wherein the first scissor lever (8) and the second scissor lever (24) are rotatably coupled to each other to form a scissor device, wherein the actuator (48), the first scissor lever (8), the second scissor lever (24) and the first connecting lever (18) are arranged to actively place the leading edge flap (28) from the retracted position to the extended position, Wherein, when moving the leading edge flap (28) from the retracted position to the intermediate position, the actuator (48) moves the first connecting rod (18) in a clockwise direction, the end (26) of the first connecting rod (18) opposite the second bearing joint (22) thus pushing the second scissor lever (24) in a forward direction, and the first scissor lever (8) follows the movement of the second scissor lever (24), such that an angle (γ) between an extension direction (50) of the first scissor lever (8) and an extension direction (52) of the second scissor lever (24) decreases with an increasing movement of the first connecting rod (18) and with the leading edge flap (28) in the intermediate position, an extension direction of the second connecting rod (30) is substantially parallel to an extension direction (50) of the first scissor lever (8), and Wherein, when moving the leading edge flap (28) from the intermediate position towards the extended position, the actuator (48) moves the first connecting rod (18) further in a clockwise direction such that the angle (γ) is further reduced and thus the second connecting rod (30) is rotated about the end of the first scissor lever (8) opposite the first support joint (14) and over-locked, which results in a further, substantially translational movement of the leading edge flap (28) upwards.
  2. 2. Flap system (2) according to claim 1, Wherein the length of the second connecting rod (30) is shorter than the length of the first connecting rod (18).
  3. 3. The flap system (2) according to claim 2, wherein the second connecting rod (30) has a length which is less than one third of the length of the first connecting rod (18).
  4. 4. Flap system (2) according to any of the preceding claims, Wherein one of the first scissor lever (8) and the second scissor lever (24) comprises a recess (70) along a main extension direction, the other of the first scissor lever (8) and the second scissor lever (24) passing through the recess (70), and Wherein the first scissor lever (8) and the second scissor lever (24) are rotatably coupled in the region of the recess (70).
  5. 5. The flap system (2) according to any one of claims 1 to 3, Wherein the first scissor lever (8) and the second scissor lever (24) comprise a rotary scissor joint (38) for coupling the first scissor lever (8) and the second scissor lever (24), wherein the scissor joint (38) is arranged in a central area of each scissor lever (8, 24).
  6. 6. The flap system (2) according to any one of claims 1 to 3, Wherein the second scissor lever (24) is directly coupled with the leading edge flap (28).
  7. 7. A flap system (2) according to any of claims 1 to 3, wherein only a single actuator (48) is used.
  8. 8. A wing (6), the wing (6) having a leading edge region (4) and a trailing edge region and having at least one flap system (2) according to any one of claims 1 to 7, the flap system (2) being mounted within the wing (6).
  9. 9. The wing (6) according to claim 8, wherein the flap system (2) is arranged in the leading edge region (4).
  10. 10. The wing (6) according to claim 8 or 9, wherein the flap system (2) is designed to move the leading edge flap (28) below a leading edge point (60) of the wing until the angle between the partial flap chord (56) and the partial wing chord (54) is 117 °.
  11. 11. The wing (6) according to claim 10, wherein the flap system is further designed to limit a gap (58) between a trailing edge (42) of the leading edge flap (28) and a leading edge point (60) of the wing (6) to 2% of the local wing chord (54).
  12. 12. An aircraft (76) having at least one wing (6) according to any one of claims 8 to 11.

Description

Flap system, wing and aircraft Technical Field The present invention relates to a system for driving a flap arrangement between a retracted position and an extended position, a wing with such a system, and an aircraft. Background In commercial aircraft, so-called high lift systems are often provided on the wing, so that the lift generating area of the wing can be increased and the camber of the wing can be increased. Mainly, these high lift systems comprise trailing edge flap devices and leading edge flap devices. For example, a leading edge flap arrangement comprises a flap extending from a recess at the underside of the wing to a position upstream of the wing. There are many different actuation mechanisms for such so-called krueger flaps. The krueger flap is typically stowed at the underside of the wing with the trailing edge pointing in a forward direction and the leading edge pointing aft. During deployment of the flap, the flap generally follows a rotational movement to reach a position in front of the leading edge of the wing with clearance from the leading edge of the wing, wherein the leading edge of the flap points in the direction of flight and wherein the trailing edge points in the aft direction. DE102011018906A1 shows an example of a leading edge flap system with krueger flaps. Here, an additional retaining element is attached to the trailing edge of the flap to influence the gap between the flap and the leading edge of the wing. EP2509859B1 shows a high-lift system which may also comprise a krueger flap having a specific design which shapes the gap created between the flap and the leading edge of the wing to a tight convergence. Disclosure of Invention Common kinematics for extending a leading edge flap in the form of a krueger flap generally provide a strict movement of the leading edge flap attached to a lever which rotates about a rotation axis. Thus, the angle between the flap chord axis and the wing chord axis is substantially proportional to the position of the lever. However, it may be advantageous to provide different movements to optimise the gap between the leading edge flap and the leading edge of the wing and to optimise the airflow over the flap and the wing. It is therefore an object of the invention to propose an improved flap system for providing a movement of a leading edge flap, which improves the airflow in the flap region, while the system should be as simple as possible. This object is met by a flap system according to the application. Advantageous embodiments and further developments can be gathered from the following description. A flap system for driving a leading edge flap between a retracted position and an extended position is proposed, the system comprising a leading edge flap with a first flap joint and a second flap joint, a first scissor lever, a second scissor lever, a first connecting lever, and an actuator, wherein the actuator is coupled to the first scissor lever or to the first connecting lever, wherein the first scissor lever comprises a first support joint for rotatably supporting the first scissor lever on a first structure fixation point, wherein an end of the first scissor lever opposite to the first support joint is coupled to the first flap joint, wherein the first connecting lever comprises a second support joint for rotatably supporting the first connecting lever on a second structure fixation point, and wherein an end of the first connecting lever opposite to the second support joint is rotatably coupled to an end of the second scissor lever, and wherein an end of the second scissor lever opposite to the end coupled to the first connecting lever is coupled to the second joint, wherein the first scissor lever and the second scissor lever are rotatably coupled to each other, wherein the first scissor lever and the first scissor lever are arranged to be in an active position and the first scissor lever and the extended position. The main advantage of the flap system according to the invention is that proportional or strict coupling of the leading edge flap angle and the flap deployment state is eliminated. The scissor device coupled to the first structure fixation point on only one end of one of the scissor levers will rotate about the first structure fixation point and will change the angle between the flap and the wing chord until a specific relationship between the rotational position of the scissor device and the closed state of the scissor device. This may be considered as an intermediate position. In this regard, a scissor device is "closed" if the scissor levers are positioned substantially flush with each other and do not enclose an angle. The closed state is considered to be the degree to which the scissor device is closed. After reaching the intermediate position, the flap angle may remain substantially constant or may change only slightly. This means that the desired flap deployment angle can be achieved almost before the flap is fully dep