Boeing 737NG main landing gear lower bearing installation tool

Abstract

The utility model discloses a Boeing 737NG main landing gear lower bearing installation tool which comprises a gravity cylinder and a sealing ring baffle ring, a handle is arranged on the side face of the gravity cylinder, the upper end and the lower end of the gravity cylinder are each provided with a PVC rubber gasket, and the inner diameter of each PVC rubber gasket is smaller than that of the gravity cylinder; during use, the gravity cylinder and the sealing ring baffle ring are respectively sleeved on an inner cylinder assembly of the main landing gear, the gravity cylinder is contacted with the surface of the inner cylinder assembly of the main landing gear through the inner side surface of the PVC rubber gasket, and the sealing ring baffle ring is padded between the gravity cylinder and a lower bearing of the main landing gear. According to the utility model, the mounting quality of the lower bearing of the Boeing 737NG main landing gear can be better ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of civil aircraft landing gear assembly tooling, and in particular relates to a Boeing 737NG main landing gear lower bearing installation tooling. Background Art

[0002] The landing gear is one of the key components of an aircraft and plays an extremely important role in the safe take-off and landing of the aircraft. It is a necessary support system for the aircraft's take-off, landing, taxiing, ground movement and parking. Its performance is directly related to the use and safety of the aircraft.

[0003] At present, the landing gear of civil airliners mainly adopts the method of oil and gas shock absorption for shock absorption. Therefore, the safety of the shock absorber strut of the landing gear is particularly important. Among them, the lower bearing is an important component of the shock absorber strut. The quality of its sealing performance directly affects the safety performance of the entire shock absorber strut.

[0004] During the renovation and maintenance of the landing gear, oil leakage from the lower bearing often occurs. Therefore, it is particularly important to use appropriate tooling during the installation of the lower bearing. As an important component that affects the sealing performance of the shock absorber strut, the lower bearing must ensure the sealing performance of both the static seal and the dynamic seal. If an inappropriate method is used during the installation process, the seal of the lower bearing will be damaged, resulting in oil leakage from the shock absorber strut.

[0005] In particular, when the lower bearing of the shock absorber strut of the Boeing 737NG landing gear is installed on the inner tube assembly, the installation of a dynamic seal is very critical. It contacts the chrome surface of the inner tube assembly and fits tightly. If it is not installed properly, it will easily cause oil leakage of the shock absorber strut. Therefore, corresponding tooling is designed for the installation of the lower bearing of the Boeing 737NG landing gear. Utility Model Content

[0006] The utility model aims to provide a Boeing 737NG main landing gear lower bearing installation tool, which can better ensure the installation quality of the Boeing 737NG main landing gear lower bearing.

[0007] The purpose of the utility model is achieved through the following technical solutions:

[0008] A Boeing 737NG main landing gear lower bearing installation tool, characterized in that it includes a gravity cylinder and a sealing ring, a handle is provided on the side of the gravity cylinder, and a circle of PVC rubber gasket is respectively provided at the upper and lower ends of the gravity cylinder, and the inner diameter of the PVC rubber gasket is smaller than the inner diameter of the gravity cylinder; when in use, the gravity cylinder and the sealing ring are respectively sleeved on the inner cylinder assembly of the main landing gear, the gravity cylinder contacts the surface of the inner cylinder assembly of the main landing gear through the inner side surface of the PVC rubber gasket, and the sealing ring is cushioned between the gravity cylinder and the lower bearing of the main landing gear.

[0009] Furthermore, the PVC rubber gasket is fixed on the end surface of the gravity cylinder by fixing screws.

[0010] Furthermore, handles are respectively provided on two opposite sides of the gravity cylinder, and the handles are round rods extending radially from the gravity cylinder.

[0011] Furthermore, the outer diameter of the gravity cylinder is equal to the outer diameter of the PVC rubber gasket.

[0012] Furthermore, the inner radius of the PVC rubber gasket is 2 mm smaller than the inner radius of the gravity cylinder.

[0013] Furthermore, the height of the gravity cylinder is 22 cm, the inner diameter is 19 cm, the outer diameter is 22 cm, the thickness of the PVC rubber gasket is 2 cm, and the length of the handle is 12.5 cm.

[0014] Furthermore, the inner edge of the seal retaining ring is provided with a downwardly protruding annular edge, and the annular edge is used to press against the dynamic seal ring of the main landing gear.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] The utility model presses down the dynamic sealing ring and the lower bearing through the cooperation of the gravity cylinder and the sealing ring retaining ring, so that the dynamic sealing ring and the lower bearing can be installed on the inner cylinder component more stably, and the installation quality is guaranteed.

[0017] The gravity cylinder of the utility model has an appropriate weight, which does not increase the labor intensity of workers when operating the tooling, and can be operated by a single person, and can also meet the requirements of the assembly process. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional schematic diagram of the gravity cylinder of the utility model;

[0019] Figure 2 It is a cross-sectional schematic diagram of the gravity cylinder of the utility model;

[0020] Figure 3 It is a three-dimensional schematic diagram of the sealing ring of the utility model;

[0021] Figure 4 It is a front view schematic diagram of the sealing ring of the utility model.

[0022] Meaning of reference numerals in the figure:

[0023] 1- gravity cylinder; 2- PVC rubber gasket; 3- handle; 4- fixing screw; 5- sealing ring; 6- annular edge. DETAILED DESCRIPTION

[0024] The utility model is further described below in conjunction with embodiments.

[0025] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0026] In the description of the present utility model, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0027] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0028] Example:

[0029] like Figures 1 to 4 The figure shows the Boeing 737NG main landing gear lower bearing installation tool of this embodiment, which includes a gravity cylinder 1 and a sealing ring 5.

[0030] The gravity cylinder 1 of this embodiment is made of 45# steel, which has a certain weight. Two opposite sides of the gravity cylinder 1 are respectively provided with handles 3, which are round rods extending along the radial direction of the gravity cylinder 1, and the material of the handles 3 is also 45# steel. The gravity cylinder 1 and the handles 3 can achieve a good anti-corrosion effect by blackening.

[0031] like Figure 2 As shown, a circle of PVC rubber gasket 2 is respectively provided at the upper and lower ends of the gravity cylinder 1, and the material of the PVC rubber gasket 2 is PVC material. The inner radius of the PVC rubber gasket 2 is 2mm smaller than the inner radius of the gravity cylinder 1, and the outer diameter of the gravity cylinder 1 is equal to the outer diameter of the PVC rubber gasket 2, and their outer surfaces are flush.

[0032] The specific fixing structure of the PVC rubber gasket 2 is as follows: four countersunk threaded holes are provided on the PVC rubber gasket 2, and corresponding threaded holes are provided on the end face of the gravity cylinder 1, which is fixed by four fixing screws 4. The fixing screws 4 are hexagon socket screws, and their heads will not protrude above the PVC rubber gasket 2, thereby ensuring that the fixing screws 4 will not damage the lower bearing.

[0033] The height of the gravity cylinder 1 of this embodiment is 22 cm, the inner diameter is 19 cm, the outer diameter is 22 cm, the thickness of the PVC rubber gasket 2 is 2 cm, the length of the handle 3 is 12.5 cm, and the overall weight of the tooling is about 10 kg. The weight of the tooling of this embodiment is moderate, and the labor intensity of the worker is not increased when operating the tooling, and it can be operated by one person, and it can also meet the requirements of the assembly process.

[0034] like Figure 3 and Figure 4 As shown, the inner edge of the seal ring 5 is provided with a downwardly protruding annular edge 6, and the annular edge 6 is used to press against the dynamic seal ring of the main landing gear.

[0035] When the tooling of this embodiment is in use, the gravity cylinder 1 and the sealing ring 5 are respectively sleeved on the inner cylinder assembly of the main landing gear, the gravity cylinder 1 contacts the surface of the inner cylinder assembly of the main landing gear through the inner side of the PVC rubber gasket 2, the sealing ring 5 is cushioned between the gravity cylinder 1 and the lower bearing of the main landing gear, and the annular edge 6 of the sealing ring 5 is against the dynamic sealing ring.

[0036] The specific process of installing the lower bearing using the tooling of this embodiment is as follows:

[0037] 1. According to the requirements of CMM (Component Maintenance Manual), use special tooling to fix the inner barrel assembly of the main landing gear and keep it in a vertical state.

[0038] 2. Refer to the CMM manual requirements and install all seals to the corresponding positions of the lower bearing. There are seals on the inner and outer diameters of the lower bearing.

[0039] 3. After the sealing ring is installed, install the lower bearing from the top of the inner cylinder assembly downwards. When it reaches the mirror surface of the inner cylinder assembly, install the lower bearing scraper. Due to the resistance between the lower bearing scraper and the inner cylinder assembly, the lower bearing is stuck on the inner cylinder assembly.

[0040] 4. Fix the lower bearing vertically on the inner cylinder assembly, install the dynamic seal ring of the lower bearing, and insert the seal ring retaining ring 5 from the top of the inner cylinder assembly.

[0041] 5. Insert the gravity cylinder 1 from the top of the inner cylinder assembly and begin to press the lower bearing downward evenly. The maintenance personnel hold the tooling with both hands, apply downward force evenly, and slowly press the lower bearing onto the chrome surface of the inner cylinder assembly, and finally complete the installation of the lower bearing.

[0042] After installation, remove the gravity cylinder 1 and the seal retaining ring 5, and check whether the dynamic seal is damaged. If there is no defect, continue the remaining assembly steps according to the CMM manual.

[0043] The above-mentioned embodiments of the utility model are not intended to limit the protection scope of the utility model, and the implementation methods of the utility model are not limited to these. All other various forms of modifications, replacements or changes made to the above-mentioned structure of the utility model based on the above-mentioned contents of the utility model, in accordance with the common technical knowledge and customary means in the field, without departing from the above-mentioned basic technical ideas of the utility model, should fall within the protection scope of the utility model.

Claims

1. A Boeing 737NG main landing gear lower bearing installation tool, characterized in that: It comprises a gravity cylinder and a sealing retaining ring, wherein a handle is arranged on the side of the gravity cylinder, and a circle of PVC rubber gasket is respectively arranged at the upper and lower ends of the gravity cylinder, and the inner diameter of the PVC rubber gasket is smaller than the inner diameter of the gravity cylinder; when in use, the gravity cylinder and the sealing retaining ring are respectively sleeved on the inner cylinder assembly of the main landing gear, and the gravity cylinder contacts the surface of the inner cylinder assembly of the main landing gear through the inner side surface of the PVC rubber gasket, and the sealing retaining ring is cushioned between the gravity cylinder and the lower bearing of the main landing gear.

2. The Boeing 737NG main landing gear lower bearing installation tool according to claim 1, characterized in that: The PVC rubber gasket is fixed on the end surface of the gravity cylinder by fixing screws.

3. The Boeing 737NG main landing gear lower bearing installation tool according to claim 1, characterized in that: The handles are respectively arranged on two opposite sides of the gravity cylinder, and the handles are round rods extending radially from the gravity cylinder.

4. The Boeing 737NG main landing gear lower bearing installation tool according to claim 1, characterized in that: The outer diameter of the gravity cylinder is equal to the outer diameter of the PVC rubber gasket.

5. The Boeing 737NG main landing gear lower bearing installation tool according to claim 1, characterized in that: The inner radius of the PVC rubber gasket is 2 mm smaller than the inner radius of the gravity cylinder.

6. The Boeing 737NG main landing gear lower bearing installation tool according to claim 3, characterized in that: The height of the gravity cylinder is 22 cm, the inner diameter is 19 cm, and the outer diameter is 22 cm. The thickness of the PVC rubber gasket is 2 cm. The length of the handle is 12.5 cm.

7. The Boeing 737NG main landing gear lower bearing installation tool according to claim 1, characterized in that: The inner edge of the sealing ring is provided with a downwardly protruding annular edge, and the annular edge is used to press against the dynamic sealing ring of the main landing gear.

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