Positioning tool for undercarriage mounting seat

Abstract

The utility model relates to the technical field of undercarriage tests, and provides a positioning tool for undercarriage mounting seats, which is used for determining the relative positions of a left mounting seat and a right mounting seat, and comprises a mandrel, a positioning block, a positioning block and a positioning block, the mounting hole of the right mounting seat is matched with the right end of the mandrel and is limited to move leftwards through a small boss; the right side locking nut is connected with the right end of the mandrel through threads and limits the right side mounting seat to move rightwards; the inner wall of the bushing is matched with the large boss, the outer wall of the bushing is matched with the mounting hole of the left mounting seat, a limiting ring is arranged at the right end of the bushing to limit the right displacement of the mandrel and the left mounting seat, and the inner diameter of the limiting ring is larger than the diameter of the small boss; the inner nut is in threaded connection with the inner wall of the bushing and limits the core shaft to move leftwards; and the left locking nut is connected to the outer wall of the bushing through threads and limits the left mounting seat to move leftwards. According to the utility model, accurate positioning of the left mounting seat and the right mounting seat is realized.

Description

Technical Field

[0001] This utility model relates to the field of landing gear testing technology, and more specifically, to a positioning fixture for a landing gear mounting base. Background Technology

[0002] In a certain type of aircraft landing gear test bench project, the aircraft landing gear needs to be installed in the test bench, and the positional accuracy requirements for each locking mechanism, actuator, linkage, etc. are very high. Due to the differences between the test bench structure and the aircraft fuselage structure, in order to ensure that the installation of the test bench can meet the requirements of subsequent tests, it is necessary to accurately locate the installation points of each mechanism.

[0003] For example, the mounting bases at both ends of the landing gear main strut serve as the initial reference, and their positioning must be accurate and the precision must be guaranteed. However, there are currently no special toolings for positioning the two relative mounting positions, so we can only rely on repeated trial installations and adjustments, which are cumbersome and have low installation efficiency. Utility Model Content

[0004] The purpose of this invention is to provide a positioning fixture for landing gear mounting base to solve the above-mentioned defects of the prior art.

[0005] This utility model is achieved through the following technical solution:

[0006] A positioning fixture for landing gear mounting seats, used to determine the relative positions of the left and right mounting seats, includes:

[0007] The mandrel has a large boss at its left end and a small boss at its right end. The mounting hole of the right mounting base mates with the right end of the mandrel and restricts its leftward displacement through the small boss.

[0008] The right-side locking nut is threaded to the right end of the spindle and restricts the right-side mounting base from moving to the right.

[0009] The inner wall of the bushing mates with the large boss, and the outer wall mates with the mounting hole of the left mounting seat. A limiting ring is provided at its right end to limit the rightward displacement of the spindle and the left mounting seat. The inner diameter of the limiting ring is larger than the diameter of the small boss.

[0010] The inner nut, connected to the inner wall of the bushing by threads, restricts the mandrel's axial displacement to the left; and

[0011] The left-side locking nut is threaded to the outer wall of the bushing and restricts the left-side mounting seat from moving to the left.

[0012] As one option, the positioning fixture also includes a bushing and an auxiliary locking nut. One end of the bushing is provided with a limiting plate. The inner wall of the bushing mates with the right end of the mandrel, and the outer wall of the bushing mates with the mounting hole of the right mounting seat. The limiting plate abuts against the right side of the right mounting seat. The right locking nut presses against the end of the bushing with the limiting plate. The auxiliary locking nut is threaded to the small boss and presses against the left side of the right mounting seat.

[0013] Optionally, the auxiliary locking nut has a groove on the side near the right mounting seat, and the diameter of the groove is larger than the diameter of the bushing.

[0014] As an alternative, the positioning fixture also includes a bushing with a limiting plate at one end. The inner wall of the bushing mates with the right end of the mandrel, and the outer wall of the bushing mates with the mounting hole of the right mounting seat. The limiting plate abuts against the left side of the right mounting seat, and the right locking nut presses the end of the bushing away from the limiting plate.

[0015] Optionally, two bushings are provided between the bushing and the mounting hole of the right mounting seat. One bushing is inserted into the mounting hole from the left side of the right mounting seat, and the other bushing is inserted into the mounting hole from the other side of the right mounting seat. The outer end of the bushing is provided with a limiting part that abuts against the side of the right mounting seat.

[0016] Optionally, the inner nut is hollow and has a spline at the end away from the spindle.

[0017] This practical technical solution has at least the following advantages and beneficial effects:

[0018] In this invention, the large boss, the left locking nut, the bushing, and the inner nut work together to fix the relative position of the left mounting seat and the mandrel. The small boss and the right locking nut work together to fix the relative position of the right mounting seat and the mandrel. In this way, not only are the relative positions of the left and right mounting seats determined (i.e., precise positioning is achieved), avoiding repeated trial installations and adjustments when installing them onto the test bench, thus improving installation efficiency, but also, because the inner diameter of the limiting ring at the right end of the bushing is larger than the diameter of the small boss, the mandrel can be moved to the left and removed without damage after the left and right mounting seats are installed and fixed on the test bench. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 A schematic diagram of the structure of a positioning fixture for a landing gear mounting base provided by this utility model;

[0021] Figure 2 A cross-sectional view of a positioning fixture for a landing gear mounting base provided by this utility model;

[0022] Figure 3 for Figure 2 Enlarged view of point A;

[0023] Figure 4 for Figure 2 Enlarged view of point B;

[0024] Figure 5 This is a schematic diagram of the internal nut structure;

[0025] Figure 6 This is a schematic diagram of the bushing structure;

[0026] Figure 7 A schematic diagram of the structure for assisting in locking the nut;

[0027] Figure 8 This is a schematic diagram of the bushing structure;

[0028] Icons: 1-Left mounting base, 2-Right mounting base, 3-Mandrel, 301-Large boss, 302-Small boss, 4-Sleeve, 401-Limiting plate, 5-Right locking nut, 6-Auxiliary locking nut, 601-Sunk, 7-Bushing, 701-Limiting part, 8-Shell, 801-Limiting ring, 9-Inner nut, 901-Spline, 10-Left locking nut, 11-Washer. Detailed Implementation

[0029] Example 1

[0030] refer to Figures 1-4 A positioning fixture for landing gear mounting seats, used to determine the relative positions of left mounting seat 1 and right mounting seat 2. It is easy to understand that the two mounting seats are defined as left mounting seat 1 and right mounting seat 2 for ease of description and understanding. Accordingly, in the following descriptions, if the descriptions of left and right directions such as "left side", "right side", "left end", "right end" are involved in the various components, they are all based on the side mounting seat and right mounting seat 2.

[0031] The positioning fixture includes a mandrel 3, a right-side locking nut 5, a bushing 8, an inner nut 9, and a left-side locking nut 10.

[0032] The left end of the mandrel 3 is provided with a large boss 301. The inner wall of the bushing 8 mates with the large boss 301, and the outer wall of the bushing 8 mates with the mounting hole of the left mounting seat 1. The right end of the bushing 8 is provided with a limiting ring 801, which abuts against the right side of the large boss 301 and the right side of the left mounting seat 1, thereby limiting the rightward displacement of the mandrel 3 and the left mounting seat 1. The inner nut 9 is threaded to the inner wall of the bushing 8. After tightening, it presses against the left side of the large boss 301, thereby limiting the leftward displacement of the mandrel 3. The left locking nut 10 is threaded to the outer wall of the bushing 8. After tightening, it presses against the left side of the left mounting seat 1, thereby limiting the leftward displacement of the left mounting seat 1. In this way, the left mounting seat 1, under the combined action of the large boss 301, the left locking nut 10, the bushing 8, and the inner nut 9, achieves a fixed relative position with the mandrel 3.

[0033] Alternatively, in this embodiment, the inner nut 9 is hollow, and a spline 901 is provided at the end of the inner nut 9 away from the spindle 3 (see reference). Figure 5 This design facilitates the tightening of the inner nut 9. Of course, in other embodiments, the inner nut 9 can also be designed with other structures to facilitate tightening. For example, the end of the inner nut 9 away from the spindle 3 may have an internal hexagonal hole, which facilitates tightening with a hexagonal wrench.

[0034] The right end of the mandrel 3 is provided with a small boss 302. The mounting hole of the right mounting seat 2 is engaged with the right end of the mandrel 3 and its displacement to the left is restricted by the small boss 302. In this embodiment, the mounting hole of the left mounting seat 1 and the mounting hole of the right mounting seat 2 are approximately the same size. The mounting hole of the right mounting seat 2 cannot be directly engaged with the right end of the mandrel 3. Therefore, the positioning fixture in this embodiment also includes a bushing 4 and an auxiliary locking nut 6.

[0035] One end of the bushing 4 is provided with a limiting disc 401 (reference). Figure 4 and Figure 6 The inner wall of the bushing 4 mates with the right end of the spindle 3, and the outer wall of the bushing 4 mates with the mounting hole of the right mounting seat 2. After the bushing 4 is installed, the limiting plate 401 abuts against the right side of the right mounting seat 2, and the end of the bushing 4 away from the limiting plate 401 abuts against the right side of the small boss 302. The right locking nut 5 is threaded to the right end of the spindle 3. After tightening, the right locking nut 5 presses against the end of the bushing 4 with the limiting plate 401 (easy to understand; in actual applications, a washer 11 can also be set to cooperate with the right locking nut 5 to achieve locking), restricting the right mounting seat 2 from moving to the right. The auxiliary locking nut 6 is threaded to the small boss 302. After tightening, it presses against the left side of the right mounting seat 2, restricting the right mounting seat 2 from moving to the left. In this way, the right mounting seat 2, under the combined action of the small boss 302, the bushing 4, the right locking nut 5, and the auxiliary locking nut 6, achieves a fixed relative position with the spindle 3.

[0036] In practical applications, during installation, the left mounting base 1 and the right mounting base 2 are placed on two parallel mounting platforms to ensure that their relative positions in the circumferential direction of the mandrel 3 are fixed. Then, the left mounting base 1 and the right mounting base 2 are fixed to the mandrel 3 using the aforementioned components, thus determining the relative positions of the left mounting base 1 and the right mounting base 2. This achieves precise positioning of the two, avoiding repeated trial installations and adjustments when installing them onto the test bench, and improving installation efficiency.

[0037] In this embodiment, the inner diameter of the limiting ring 801 is larger than the diameter of the small boss 302. With this setting, after the left mounting seat 1 and the right mounting seat 2 are installed and fixed on the test bench, the inner nut 9 and the right locking nut 5 can be removed, and the mandrel 3 can be moved to the left and taken out without damage (it is easy to understand that the auxiliary locking nut 6 should be removed before the mandrel 3 is taken out of the left mounting seat 1).

[0038] Based on the above, two bushings 7 are provided between the bushing 4 and the mounting hole of the right mounting seat 2. One bushing 7 is inserted into the mounting hole from the left side of the right mounting seat 2, and the other bushing 7 is inserted into the mounting hole from the other side of the right mounting seat 2. The outer end of the bushing 7 is provided with a limiting part 701 that abuts against the side of the right mounting seat 2 (see reference). Figure 4 and Figure 8 Based on this, the auxiliary locking nut 6 abuts against the bushing 7 on the left side, and the limiting plate 401 of the bushing 4 abuts against the bushing 7 on the right side.

[0039] In addition, in this embodiment, the auxiliary locking nut 6 is provided with a recess 601 on the side near the right mounting base 2 (see reference). Figure 4 and Figure 7 The diameter of the sink 601 is larger than the diameter of the bushing 4. This design prevents the auxiliary locking nut 6 from hitting the bushing 4 when it is tightened.

[0040] Example 2

[0041] The difference between this embodiment and embodiment 1 is that the positioning fixture does not include the auxiliary locking nut 6 in addition to the bushing 4. Similarly, one end of the bushing 4 is provided with a limiting plate 401. The inner wall of the bushing 4 cooperates with the right end of the spindle 3, and the outer wall of the bushing 4 cooperates with the mounting hole of the right mounting seat 2. The limiting plate 401 abuts against the left side of the right mounting seat 2. The right locking nut 5 presses the end of the bushing 4 away from the limiting plate 401, which is the direction of bushing 4 installation in embodiment 1. With this setting, the right mounting seat 2 and the spindle 3 can be fixed without the auxiliary locking nut 6.

[0042] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A positioning fixture for landing gear mounting seats, used to determine the relative positions of the left mounting seat and the right mounting seat, characterized in that, include: The mandrel has a large boss at its left end and a small boss at its right end. The mounting hole of the right mounting base mates with the right end of the mandrel and restricts its leftward displacement through the small boss. The right-side locking nut is threaded to the right end of the spindle and restricts the right-side mounting base from moving to the right. The inner wall of the bushing mates with the large boss, and the outer wall mates with the mounting hole of the left mounting seat. A limiting ring is provided at its right end to limit the rightward displacement of the spindle and the left mounting seat. The inner diameter of the limiting ring is larger than the diameter of the small boss. The inner nut, connected to the inner wall of the bushing by threads, restricts the mandrel's axial displacement to the left; and The left-side locking nut is threaded to the outer wall of the bushing and restricts the left-side mounting seat from moving to the left.

2. The positioning fixture for landing gear mounting base according to claim 1, characterized in that, The positioning fixture also includes a bushing and an auxiliary locking nut. One end of the bushing is provided with a limiting plate. The inner wall of the bushing mates with the right end of the mandrel, and the outer wall of the bushing mates with the mounting hole of the right mounting seat. The limiting plate abuts against the right side of the right mounting seat. The right locking nut presses against the end of the bushing with the limiting plate. The auxiliary locking nut is threaded to the small boss and presses against the left side of the right mounting seat.

3. The positioning fixture for landing gear mounting base according to claim 2, characterized in that, The auxiliary locking nut has a groove on the side near the right mounting base, and the diameter of the groove is larger than the diameter of the bushing.

4. The positioning fixture for landing gear mounting base according to claim 1, characterized in that, The positioning fixture also includes a bushing with a limiting plate at one end. The inner wall of the bushing mates with the right end of the mandrel, and the outer wall of the bushing mates with the mounting hole of the right mounting seat. The limiting plate abuts against the left side of the right mounting seat, and the right locking nut presses the end of the bushing away from the limiting plate.

5. The positioning fixture for a landing gear mounting base according to any one of claims 2-4, characterized in that, Two bushings are provided between the bushing and the mounting hole of the right mounting seat. One bushing is inserted into the mounting hole from the left side of the right mounting seat, and the other bushing is inserted into the mounting hole from the other side of the right mounting seat. The outer end of the bushing is provided with a limiting part that abuts against the side of the right mounting seat.

6. The positioning fixture for a landing gear mounting base according to any one of claims 1-4, characterized in that, The inner nut is hollow and has a spline at the end away from the spindle.

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