Auxiliary tool for measuring travel of actuator cylinder of Boeing aircraft

Abstract

An auxiliary tool for measuring the stroke of an actuator cylinder of a Boeing aircraft comprises two sets of auxiliary measuring assemblies which are identical in structural size. The first measuring auxiliary assembly is installed on a connecting lug at the first end of the actuator cylinder, and the second measuring auxiliary assembly is installed on a connecting lug at the second end of the actuator cylinder, so that the two ends of the actuator cylinder are provided with extending clamping points, and the center distance between the two ball bearings can be measured through cooperation with a vernier caliper. The measuring auxiliary assembly comprises a positioning end cover and a reducing screw. The positioning end cover is provided with a central screw hole and a positioning groove. The reducing screw rod comprises a rod head, a thick rod part and a thin rod part which are integrally and coaxially arranged; and the diameters of the rod head, the thick rod part and the thin rod part are gradually reduced. The diameter of the thick rod part adapts to the inner diameter of the ball head bearing, and the thin rod part is provided with an external thread matched with a central screw hole of the positioning end cover. The auxiliary tool for measuring the travel distance of the actuator cylinder can be matched with a vernier caliper to measure the travel distance of the actuator cylinder, and is simple in structure, convenient to operate, high in precision and high in measuring efficiency.

Description

Technical Field

[0001] This utility model relates to the field of aircraft ground maintenance technology, and in particular to an auxiliary tool for measuring the stroke of Boeing aircraft actuators. Background Technology

[0002] The attitude adjustment of control surfaces such as flaps, slats, and ailerons on civil aircraft is achieved through the extension and retraction of actuators. Therefore, during maintenance, it is necessary to measure the center-to-center distance between the bearings of the lugs at both ends of the actuator when it is retracted / extended, according to the requirements of the Component Maintenance Manual, in order to adjust the position of the piston rod lugs during maintenance. Please refer to the appendix to the instruction manual. Figure 1 The actuating cylinder includes a cylinder body 100 and a telescopic rod 101 movably fitted inside the cylinder body 100. Lugs 102 are provided at both ends of the actuating cylinder, and ball bearings 103 are movably disposed within the lugs 102. Limiting protrusions 104 are respectively provided on the end faces of both sides of the lugs 102. In actual working conditions, if the center distance R between the two ball bearings 103 in the telescopic state is measured using conventional measuring tools or methods, the following defects exist:

[0003] 1. The manual does not mention or limit the specific measurement method, but it requires a stroke range of ±1mm and high accuracy. If the center distance between the two ball bearings 103 is calculated indirectly by measuring the dimensions of each related part through conventional methods, it will not only be difficult to operate, but also have a large error, which cannot meet the requirements of the manual.

[0004] 2. The aircraft manufacturer does not provide dedicated measuring tools, and the relevant manuals do not recommend relevant tools or dimensions. If a conventional ruler is used for measurement, the error will be large. If a high-precision vernier caliper is used for measurement, there are no suitable locking points on the two ball bearings 103, which makes measurement difficult and may lead to improper adjustment of the actuator, causing damage to relevant parts of the aircraft and resulting in huge economic losses. Utility Model Content

[0005] In view of the shortcomings of the prior art, this utility model provides an auxiliary tool for measuring the stroke of Boeing aircraft actuators, so as to overcome the deficiencies in the prior art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A Boeing aircraft actuator stroke measurement auxiliary tool includes two sets of measurement auxiliary components with identical structural dimensions;

[0008] The measurement auxiliary component includes a positioning end cap and a variable diameter screw that can be screwed together with each other;

[0009] The positioning end cap has a protruding outer edge and a central screw hole along the axial direction. The protruding outer edge of the positioning end cap is symmetrically provided with positioning grooves.

[0010] The variable diameter screw includes an integrally coaxially arranged head, a thicker rod section, and a thinner rod section; the thicker rod section is located between the head and the thinner rod section, and the diameters of the head, the thicker rod section, and the thinner rod section decrease stepwise.

[0011] The diameter of the thicker rod is adapted to the inner diameter of the ball bearing, allowing the thicker rod to pass through the ball bearing with a clearance fit.

[0012] The thin rod is provided with an external thread that is screwed into the central screw hole of the positioning end cap.

[0013] Preferably, the outer diameter of the rod head is larger than the inner diameter of the ball bearing; the diameter of the thinner rod section is smaller than the diameter of the thicker rod section.

[0014] Preferably, a drive groove is provided laterally on the outer end face of the rod head.

[0015] Preferably, the internal thread of the central screw hole of the positioning end cap is a coarse thread of M10*1.5.

[0016] Preferably, the length of the thicker rod section is 12mm, and the thicker rod section is a smooth rod.

[0017] Preferably, the thin rod portion has a length of 20 mm and a diameter of 8 mm, and the tolerance for the clearance fit between the thin rod portion and the inner diameter of the ball bearing is -0.05 mm.

[0018] Preferably, the depth of the positioning groove on the protruding outer edge of the positioning end cap is greater than the protrusion height of the upper positioning protrusion of the lug.

[0019] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0020] 1) The Boeing aircraft actuator stroke measurement auxiliary tool in this case includes two sets of measurement auxiliary components with identical structural dimensions. The first set of measurement auxiliary components is installed in the ball bearing on the lug at the first end of the actuator, and the second set of measurement auxiliary components is installed in the ball bearing on the lug at the second end of the actuator. This allows the actuator to have extended locking points at both ends during measurement. The locking points, in conjunction with the vernier caliper, can directly and accurately measure the actuator stroke distance. The structure is simple, easy to operate, low in manufacturing cost, and high in measurement accuracy. It can effectively improve measurement efficiency and is conducive to deployment and promotion.

[0021] 2) The Boeing aircraft actuator stroke measurement auxiliary tool in this case has a positioning end cap with a protruding outer edge and symmetrical positioning grooves on the protruding outer edge. The positioning grooves avoid interference from the limiting protrusions on the lugs, so that the positioning end cap can be fastened and tightly attached to the front end face of the lugs. This ensures that the locking state between the positioning end cap and the variable diameter screw is stable, avoids measurement errors caused by the eccentricity of the variable diameter screw during the measurement process, and further improves the measurement accuracy.

[0022] 3) The Boeing aircraft actuator stroke measurement auxiliary tool in this case can measure the stroke of various actuators such as the B-737 aircraft spoiler actuator 251A1240-* and leading edge flap actuator assembly 382000-1001, realizing one tool to adapt to multiple models and has strong applicability.

[0023] To provide a clearer understanding of this invention, the preferred embodiments of this invention will be described below in conjunction with the accompanying drawings. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the actuator cylinder in the background art;

[0025] Figure 2 This is an assembly diagram of the measuring auxiliary component of this utility model installed on the actuator lug;

[0026] Figure 3 This is a reference diagram showing the usage state of this utility model;

[0027] Figure 4 , Figure 5 This is a schematic diagram of the measurement auxiliary component of this utility model.

[0028] Attached image labels:

[0029] 1-Positioning end cap; 2-Reducing diameter screw; 11-Center screw hole; 12-Positioning groove; 21-Rod head; 22-Thick rod section; 23-Thin rod section; 211-Drive groove; 231-External thread; 100-Actuating cylinder body; 101-Telescopic rod; 102-Ear; 103-Ball bearing; 104-Limiting protrusion. Detailed Implementation

[0030] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0031] Furthermore, if terms such as "first" or "second" are used for descriptive purposes only, they are mainly used to distinguish different devices, components or parts (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance or quantity of the indicated devices, components or parts, and should not be construed as indicating or implying relative importance.

[0032] Furthermore, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0033] Please also refer to Figure 1-5 This utility model provides an auxiliary tool for measuring the stroke of a Boeing aircraft actuator, including two sets of measuring auxiliary components with identical structural dimensions. The first set of measuring auxiliary components is installed in the ball bearing 103 on the lug 102 at the first end of the actuator, and the second set of measuring auxiliary components is installed in the ball bearing 103 on the lug 102 at the second end of the actuator. This allows the actuator to have extended locking points at both ends during measurement, and with the help of a vernier caliper, the center distance (R) between the two ball bearings 103 can be directly and accurately measured.

[0034] The measuring auxiliary component includes a positioning end cap 1 and a variable diameter screw 2 that can be screwed together with each other.

[0035] The positioning end cap 1 has a protruding outer edge and a central screw hole 11 is provided along the axial direction. The positioning end cap 1 has symmetrical positioning grooves 12 on the protruding outer edge. The positioning grooves 12 correspond to the limiting protrusions 104 on the ear 102, so that the positioning end cap 1 can be fastened and attached to the front end face of the ear 102.

[0036] The variable diameter screw 2 includes a rod head 21, a thick rod portion 22 and a thin rod portion 23 integrally and coaxially arranged. The thick rod portion 22 is located between the rod head 21 and the thin rod portion 23, and the diameters of the rod head 21, the thick rod portion 22 and the thin rod portion 23 decrease step by step, so that the variable diameter screw 2 forms a rod body with three-stage variable diameter.

[0037] The rod head 21 has an outer diameter larger than the inner diameter of the ball bearing 103. A drive groove 211 is provided laterally on the outer end face of the rod head 21. The drive groove 211 cooperates with a conventional screwdriver to make it easier to tighten the variable diameter screw 2.

[0038] The diameter of the thick rod portion 22 is adapted to the inner diameter of the ball bearing 103, so that the thick rod portion 22 can pass through the ball bearing 103 through a clearance fit.

[0039] The thin rod portion 23 has a smaller diameter than the thick rod portion 22, and the thin rod portion 23 is provided with an external thread 231 that is screwed into the center screw hole 11 of the positioning end cover 1.

[0040] Preferably, in this embodiment, the internal thread of the central screw hole 11 of the positioning end cover 1 is a coarse thread of M10*1.5.

[0041] Preferably, in this embodiment, the length of the thick rod portion 22 is 12mm, and the thick rod portion 22 is a smooth rod.

[0042] Preferably, in this embodiment, the thin rod portion 23 has a length of 20 mm and a diameter of 8 mm, and the tolerance of the clearance fit between the thin rod portion 23 and the inner diameter of the ball bearing 103 is -0.05 mm.

[0043] Preferably, in this embodiment, the depth of the positioning groove 12 on the protruding outer edge of the positioning end cap 1 is greater than the protrusion height of the upper limit protrusion 104 on the ear 102, so that the limiting protrusion 104 on the ear 102 can be completely embedded in the positioning groove 12 of the positioning end cap 1, so that the positioning end cap 1 can be fastened and adhered to the front end surface of the ear 102.

[0044] Working principle or auxiliary measurement operation procedure:

[0045] 1. Align the positioning groove 12 of the positioning end cover 1 with the limiting protrusion 104 on the ear 102, and press the positioning end cover 1 onto the front end face of the actuator ear 102. Since the positioning groove 12 avoids the interference of the limiting protrusion 104, the positioning end cover 1 can fit tightly against the front end face of the ear 102.

[0046] 2. Insert the reducing screw 2 into the ball bearing 103 of the actuating cylinder from the rear end face side of the lug 102. Since the central screw hole 11 of the positioning end cover 1 can be screwed into the thin rod part 23 of the reducing screw 2, the positioning end cover 1 and the reducing screw 2 can be locked by simply rotating the reducing screw 2 clockwise. The locking end cover 1 is located on the front end face side of the lug 102, while the reducing screw 2 is on the rear end face side of the lug 102. The thin rod part 23 of the reducing screw 2 passes through the ball bearing 103 and the central screw hole 11 of the positioning end cover 1 and extends to the outside of the actuating cylinder lug 102, forming a check point that can be measured by a vernier caliper.

[0047] 3. After installing the first and second locking points at both ends of the actuator cylinder, the distance between the two ball bearings 103 of the lug 102 can be directly measured with the help of a vernier caliper when fully retracted / fully extended. The center distance between the two ball bearings 103 of the lug 102 can be obtained by subtracting the diameter of the thin rod 23 from the reading of the vernier caliper.

[0048] Compared to existing technologies, the Boeing aircraft actuator stroke measurement auxiliary tool in this case can construct auxiliary measurement points at both ends of the actuator. The points, in conjunction with vernier calipers, can directly and accurately measure the actuator stroke distance. It has a simple structure, is easy to operate, and has low manufacturing cost, which can effectively improve measurement efficiency and is conducive to deployment and promotion.

[0049] The embodiments described above are merely examples of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.

Claims

1. A Boeing aircraft actuator stroke measurement auxiliary tool, comprising two sets of measurement auxiliary assemblies with the same structural size, characterized in that: the measurement auxiliary assembly comprises a positioning end cover (1) and a variable diameter screw (2) that can be screwed together; the positioning end cover (1) has a convex outer edge, and a center screw hole (11) is arranged in the axial direction of the positioning end cover (1), and a positioning groove (12) is symmetrically arranged on the convex outer edge of the positioning end cover (1); the variable diameter screw (2) comprises a rod head (21), a thick rod part (22) and a thin rod part (23) arranged coaxially; the thick rod part (22) is located between the rod head (21) and the thin rod part (23), and the diameters of the rod head (21), the thick rod part (22) and the thin rod part (23) gradually decrease; the diameter of the thick rod part (22) is adapted to the inner diameter of the ball head bearing (103), so that the thick rod part (22) can pass through the ball head bearing (103) in a clearance fit manner; the thin rod part (23) is provided with external threads (231) which are screwed with the center screw hole (11) of the positioning end cover (1).

2. A Boeing actuator travel measuring aid as defined in Claim 1, wherein: The outer diameter of the rod head (21) is greater than the inner diameter of the ball head bearing (103).

3. A Boeing actuator travel measuring aid as defined in Claim 1, wherein: The outer end surface of the rod head (21) is transversely provided with a driving groove (211).

4. The Boeing actuator travel measuring aid of Claim 1, wherein: The internal thread of the center screw hole (11) of the positioning end cover (1) is M10*1.5 thick thread.

5. The Boeing actuator travel measuring aid of Claim 1, wherein: The length of the thick rod part (22) is 12mm, and the thick rod part (22) is a light rod.

6. A Boeing actuator travel measuring aid as defined in Claim 1, wherein: The length of the thin rod part (23) is 20mm, and the diameter of the thin rod part (23) is 8mm, and the clearance fit tolerance between the thin rod part (23) and the inner diameter of the ball head bearing (103) is -0.05mm.

7. A Boeing actuator travel measuring aid as defined in claim 1, wherein: The depth of the positioning groove (12) on the convex outer edge of the positioning end cover (1) is greater than the protruding height of the limiting protruding part (104) on the lug (102).

8. A Boeing actuator travel measuring aid as defined in claim 1, wherein: The diameter of the thin rod part (23) is smaller than the diameter of the thick rod part (22).

Images