Adjustable truss type multi-strut landing gear

Abstract

The invention provides an adjustable truss type multi-supporting-column undercarriage, and belongs to the field of aircraft undercarriage.The adjustable truss type multi-supporting-column undercarriage comprises undercarriage supporting columns, lower rocker arms, rotating shafts, side supporting rods, supports, buffers, upper rocker arms and front supporting rods, the undercarriage supporting columns and the lower rocker arms are in pivot joint through the rotating shafts, machine wheels are installed on the lower rocker arms, and the side supporting rods are arranged on the lower rocker arms; the side supporting rod is of a length-adjustable structure, one end of the side supporting rod is hinged to the rotating shaft, the other end of the side supporting rod is connected to the aircraft body structure, the support is installed on the rotating shaft pivoted to the undercarriage supporting column and the lower rocker arm and used for supporting the undercarriage supporting column of the rear undercarriage, one end of the buffer is hinged to the lower rocker arm, and the other end of the buffer is hinged to the upper rocker arm. The upper rocker arm is pivoted to the undercarriage supporting column, the buffer is driven to move by driving the upper rocker arm, then the lower rocker arm can rotate relative to the rotating shaft, and folding and unfolding of the undercarriage are achieved.

Description

Technical Field

[0001] The present application belongs to the technical field of aircraft landing gear, and in particular relates to an adjustable truss-type multi-strut landing gear. Background Art

[0002] Nowadays, small aircraft generally use strut-type landing gear or rocker-type landing gear. When this type of landing gear is retracted or extended, all large parts of the landing gear are involved in the retraction and extension process, so a large retraction and extension actuator is required. In addition, this type of landing gear has complex force transmission and is heavy. Summary of the invention

[0003] The object of the present application is to provide an adjustable truss-type multi-strut landing gear to solve or alleviate at least one problem in the background technology.

[0004] The technical solution of the present application is: an adjustable truss-type multi-strut landing gear, comprising: a landing gear strut, a lower rocker arm, a rotating shaft, a side support rod, a bracket, a buffer and an upper rocker arm, wherein the landing gear strut and the lower rocker arm are pivotally connected by a rotating shaft, and a wheel is installed on the lower rocker arm. The side support rod is a structure with adjustable length, one end of which is hinged to the rotating shaft and the other end is connected to the body structure. The bracket is installed on the rotating shaft pivoting the landing gear strut and the lower rocker arm, and is used to support the landing gear strut of a rear group of landing gears. One end of the buffer is hinged to the lower rocker arm and the other end is hinged to the upper rocker arm. The upper rocker arm is pivoted to the landing gear strut, and the buffer is driven to move by driving the upper rocker arm, so that the lower rocker arm can be rotated relative to the rotating shaft, thereby realizing the retraction and extension of the landing gear.

[0005] Preferably, the side support rod includes a rod body, an adjusting joint, and a locking nut. The inner surface and outer surface of the rod body and the adjusting joint are respectively provided with matching internal threads and external threads. The end of the rod body is connected to the rotating shaft, and the adjusting joint is connected to the body structure. The length of the side support rod can be adjusted by rotating the rod body or the adjusting joint. The locking nut is installed on the adjusting joint and is used to apply a locking force to the rod body when the rod body and the adjusting joint are adjusted to a predetermined length.

[0006] Preferably, the front support rod has the same structure as the side support rod.

[0007] Preferably, a rotation-stopping pad is further included. A groove is provided on the adjusting joint or the rod body. The rotation-stopping pad is arranged in the groove to limit the locking nut from further rotation after the rod body and the adjusting joint are adjusted to a proper position.

[0008] Preferably, a bearing is provided on the adjusting joint.

[0009] Preferably, the bearing is a spherical plain bearing.

[0010] Preferably, an opening is provided on the body of the bracket, the buffer is placed in the opening and moves in the opening, and a first ear piece located in the middle and a second ear piece located in the corner are provided on the upper side of the opening of the bracket, the first ear piece is used to connect to the landing gear strut of the next set of landing gear, and the second ear piece is used to connect to the body structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solution provided by the present application, the following is a brief introduction to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present application.

[0012] Figure 1 This is a schematic diagram of the adjustable truss-type multi-strut landing gear of the present application.

[0013] Figure 2 It is a schematic diagram of the side support rod in this application. DETAILED DESCRIPTION

[0014] In order to make the purpose, technical solutions and advantages of the implementation of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below in conjunction with the drawings in the embodiments of this application.

[0015] like Figure 1 As shown, the present application provides an adjustable truss-type multi-strut landing gear including: a landing gear strut 1, a lower rocker arm 2, a rotating shaft 3, a side support rod 4, a bracket 5, a buffer 6, an upper rocker arm 7 and a front support rod 8.

[0016] The landing gear strut 1 is pivotally connected to the lower rocker arm 2 through a rotating shaft 3, and a wheel is installed on the lower rocker arm 2. The front support rod 8 is hinged to the front end of the landing gear strut 1, and it is a length-adjustable structure.

[0017] The side support rod 4 is also a structure with adjustable length, one end of which is hinged to the rotating shaft 3 and the other end is connected to the body structure.

[0018] The bracket 5 is mounted on the rotating shaft 3 and is used to support the landing gear struts (not shown) of the rear landing gear.

[0019] One end of the buffer 6 is hinged to the lower rocker arm 2, and the other end is hinged to the upper rocker arm 7. The upper rocker arm 7 is pivoted to the landing gear strut 1. By driving the upper rocker arm 7, the lower rocker arm 2 can be rotated relative to the rotating shaft 3, thereby retracting and lowering the wheels.

[0020] The front support rod 8 has the same structure as the side support rod 4 , and the present application takes the side support rod 4 as an example for explanation.

[0021] like Figure 2As shown, the side support rod 4 comprises a rod body 41, an adjustment joint 42, a locking nut 43 and a stop washer 44. The inner and outer surfaces of the rod body 41 and the adjustment joint 32 are respectively provided with matching internal and external threads. The end of the rod body 41 is connected to the rotating shaft 3, and the adjustment joint 42 is connected to the body structure. The length of the side support rod 4 is adjusted by rotating the rod body 41 or the adjustment joint 42. The locking nut 43 is installed on the adjustment joint 42. By rotating the locking nut 43, a locking force is applied to the rod body 41 when the rod body 41 and the adjustment joint 42 are adjusted to a predetermined length. A groove may be provided on the adjustment joint 42 or the rod body 41, and the stop washer 44 is provided in the groove. When the rod body 41 and the adjustment joint 42 are adjusted to an appropriate position, the stop washer 44 provided in the groove limits the locking nut 43 from continuing to rotate.

[0022] It should be noted that the front strut 8 and the side strut 4 have the same structure but different lengths and loads. The adjustable truss-type multi-strut landing gear adjusts the lateral and vertical positions of the landing gear through the side strut 4, and adjusts the directional position of the landing gear through the front strut 8, so that each set of landing gear can achieve independent position adjustment in three directions.

[0023] In some embodiments of the present application, a bearing is provided on the adjustment joint 42 connected to the body structure, which is used to adjust the swing angle of the side support rod 4. Further, the bearing is a spherical bearing.

[0024] In the present application, an opening is provided on the body of the bracket 5, and the buffer 6 is placed in the opening and can move in the opening. The upper side of the opening of the bracket 5 is provided with a first ear piece 51 located in the middle and a second ear piece 52 located in the corner. The first ear piece 51 is used to connect to the landing gear strut of the next set of landing gear, and the second ear piece is used to connect to the body structure.

[0025] The adjustable truss type multi-strut landing gear of the present application adopts a fixed truss support, and the horizontal state and lateral support state of the wheel axle are adjusted by the length-adjustable side support rod 4. The retractable actuator (not shown) provides a force and acts on the upper rocker arm 7, and the upper rocker arm 7 drives the buffer 6 to move, and the buffer 6 drives the lower rocker arm 2 to rotate around the rotating shaft 3, thereby meeting the retractable function of the landing gear. The landing gear struts of the rear group of landing gears are supported by the upper side of the bracket 5, so that multiple groups of landing gears can be connected in series, but the multiple groups of landing gears are relatively independent (independent load-bearing, independent retractable, and independent adjustment of the wheel axle level).

[0026] The adjustable truss-type multi-strut landing gear provided in the present application bears large lateral loads through the side support rods that play a lateral supporting role, and at the same time adjusts the level of the wheel axle of the landing gear; secondly, the three-point joint bearing in the same plane along the heading can release the heading load, so that the bracket 5 only bears lateral and vertical loads, so that each set of truss-type landing gear can bear independently, and the number of truss-type landing gears can be expanded according to the size of the aircraft or the take-off weight requirements.

[0027] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. An adjustable truss-type multi-strut landing gear, characterized in that: include: A landing gear strut, a lower rocker arm, a rotating shaft, a side strut, a front strut, a bracket, a buffer and an upper rocker arm, wherein the landing gear strut and the lower rocker arm are pivotally connected by the rotating shaft, a wheel is installed on the lower rocker arm, the side strut is a length-adjustable structure, one end of which is hinged to the rotating shaft and the other end is connected to the body structure, the bracket is installed on the rotating shaft pivoting the landing gear strut and the lower rocker arm, and is used to support the landing gear strut of a rear group of landing gears, one end of the buffer is hinged to the lower rocker arm, and the other end is hinged to the upper rocker arm, the upper rocker arm is pivoted to the landing gear strut, and the buffer is driven to move by driving the upper rocker arm, so that the lower rocker arm can be rotated relative to the rotating shaft, thereby realizing the retraction and extension of the landing gear.

2. The adjustable truss-type multi-strut landing gear according to claim 1, characterized in that: The side support rod includes a rod body, an adjusting joint, and a locking nut. The inner and outer surfaces of the rod body and the adjusting joint are respectively provided with matching internal and external threads. The end of the rod body is connected to the rotating shaft, and the adjusting joint is connected to the body structure. The length of the side support rod can be adjusted by rotating the rod body or the adjusting joint. The locking nut is installed on the adjusting joint and is used to apply a locking force to the rod body when the rod body and the adjusting joint are adjusted to a predetermined length.

3. The adjustable truss-type multi-strut landing gear according to claim 1, characterized in that: The front support rod has the same structure as the side support rod.

4. The adjustable truss-type multi-strut landing gear according to claim 2, characterized in that: It also includes a rotation-stopping pad. A groove is provided on the adjusting joint or the rod body. The rotation-stopping pad is arranged in the groove to limit the locking nut from further rotation after the rod body and the adjusting joint are adjusted to a proper position.

5. The adjustable truss-type multi-strut landing gear according to claim 1, characterized in that: A bearing is arranged on the adjusting joint.

6. The adjustable truss-type multi-strut landing gear according to claim 1, characterized in that: The bearing is a spherical plain bearing.

7. The adjustable truss-type multi-strut landing gear according to claim 1, characterized in that: An opening is provided on the body of the bracket, and the buffer is placed in the opening and moves in the opening. A first ear piece located in the middle and a second ear piece located in the corner are provided on the upper side of the opening of the bracket. The first ear piece is used to connect with the landing gear strut of the next set of landing gear, and the second ear piece is used to connect with the body structure.

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