Special tool for measuring axial clearance of aircraft synchronizer

Abstract

The utility model belongs to the technical field of aviation equipment, and relates to a special tool for measuring the axial clearance of an aircraft synchronizer, which comprises a dial indicator, a supporting rod, an adjusting frame, a lifting sheet, a pressing sheet, a tool base, a pressing sheet support and a lifting sheet placing plate. When the tool is used, the synchronizer is installed on the tool base, a wire of the synchronizer penetrates through the installation hole of the tool base, the synchronizer shaft is installed upwards, and at the moment, attention is paid to not damage the wire. And the pressing sheet is pressed on the synchronizer, and the butterfly nut is tightened. The synchronizer shaft is sleeved with the fixing base of the lifting piece, and the compression screw is locked. The dial indicator is installed on the supporting rod, and the fixing nut of the dial indicator is locked after the measuring shaft of the dial indicator is vertically downward. The supporting rod is moved up and down through the adjusting frame, so that the measuring shaft of the dial indicator is aligned with the synchronizer shaft, and the scale value zero position is adjusted. The lifting sheet is lifted up and down, the reading of the dial indicator is observed, and the value is the axial clearance value of the synchronizer.

Description

Technical Field

[0001] This utility model belongs to the field of aviation equipment technology and relates to a special tooling for measuring the axial clearance of aircraft synchronizers. Background Technology

[0002] Aircraft radio electromagnetic indicators (MEIs) are used to display information such as the aircraft's heading angle and radio azimuth angle. Each aircraft is equipped with two MEIs, one in the forward and one in the forward cockpit. During major overhauls, it was found that the radio channel failure rate of this product was as high as 90%, with the main symptoms being large errors in the radio channel pointer, slow follow-up, and jamming. The cause of these failures was damage to the synchronizer, an internal assembly component. However, the manufacturer of this synchronizer has a severely insufficient production capacity to meet the needs of major overhauls. Outsourcing repairs is expensive and cannot guarantee the repair cycle. According to the repair process requirements, the synchronizer must be accurately measured to have an axial clearance within the range of 0.07mm to 0.11mm after repair to be considered acceptable. Therefore, there is an urgent need for specialized tooling for measuring the axial clearance of synchronizers.

[0003] Existing technology results in a synchronizer shaft that is relatively slender and long, with small axial clearance, making it prone to bending and deformation. Furthermore, the shape of the synchronizer's mounting point is complex, requiring careful attention to the clamping method. The factory can provide dial indicators and holders; the dial indicators are accurate.

[0004] Therefore, a special tooling is needed to measure the axial clearance of the synchronizer after maintenance, thereby ensuring the quality of aircraft radio electromagnetic indicator repair work. Utility Model Content

[0005] To solve the above problems, this utility model provides a special tooling for measuring the axial clearance of an aircraft synchronizer.

[0006] The technical solution of this utility model is as follows:

[0007] A special tooling for measuring the axial clearance of an aircraft synchronizer includes a dial indicator 1, a support rod 2, an adjustment frame 3, a lifting plate 5, a pressure plate 6, a tooling base 8, a pressure plate support 9, and a lifting plate placement plate 11.

[0008] The adjusting frame 3 is mounted on the upper surface of the tooling base 8; the support rod 2 is arranged horizontally, with one end mounted on the adjusting frame 3 and the dial indicator 1 mounted on the other end of the support rod 2; the height of the dial indicator 1 is adjusted by adjusting the height of the support rod 2 through the adjusting frame 3.

[0009] There are two pressure plate supports 9, arranged vertically and symmetrically installed on the upper surface of the tooling base 8. The distance between the two pressure plate supports 9 is greater than the diameter of the synchronizer 7. There are two pressure plates 6, arranged horizontally and installed on the pressure plate supports 9 by wing nuts. The pressure plates 6 are used to press on the synchronizer 7 to further fix the synchronizer 7.

[0010] There are two lifting plate placement plates 11, arranged vertically and symmetrically installed on the upper surface of the tooling base 8. The distance between the two lifting plate placement plates 11 is greater than the distance between the two pressing plate supports 9. The two ends of the lifting plate 5 are respectively located on the two lifting plate placement plates 11, including a flat plate 12 and a fixed seat 13. The center of the flat plate 12 is provided with a cylindrical through hole for installing the fixed seat 13. The fixed seat 13 is a cylindrical structure with internal threads on the inner surface. During measurement, the fixed seat 13 is threadedly connected to the synchronizer shaft 4 and locked by a clamping screw. At this time, the lifting plate 5 is not located on the lifting plate placement plate 11.

[0011] The tooling base 8 is provided with mounting holes for synchronizer shaft 4. The synchronizer 7 is installed between two pressure plate supports 9, and the synchronizer shaft 4 is coaxial with the measuring shaft of the fixed base 13 and the dial indicator 1.

[0012] The tooling base 8 is threadedly connected to the adjustment frame 3, the pressing support 9, and the lifting plate 11.

[0013] The lower surface of the tooling base 8 is fixedly connected to four base legs 10 by threads.

[0014] The tooling base 8 is made of hard aluminum plate, and the lifting plate 5 is made of stainless steel.

[0015] The beneficial effects of this utility model are:

[0016] (1) The tooling base is made of hard aluminum plate. In order to meet the fixing needs of other parts, it is equipped with synchronizer mounting holes, dial indicator bracket fixing threads, pressure plate support fixing threads, lifting plate placement plate fixing threads, and base support feet fixing threads. The base and base support feet are fixedly connected by threads. The four base support feet are the same size to ensure that the base is level.

[0017] (2) The lifting plate is made of stainless steel plate, with a cylindrical synchronizer shaft fixing seat welded in the center. Each end of the fixing seat is equipped with a clamping fixing nail to clamp the synchronizer shaft. The clamping at both ends ensures uniform force.

[0018] (3) The lifting plate placement plate is fastened to the base plate with screws. The lifting plate can be placed horizontally on the lifting plate placement plate, which helps to determine whether the synchronous shaft is vertically fixed.

[0019] (4) This utility model achieves accurate measurement of the axial clearance of the aircraft synchronizer through mechanical operation, which reduces the aircraft maintenance cost and ensures the quality and progress of aircraft maintenance. Attached Figure Description

[0020] Figure 1 This is a front view of the tooling of this utility model;

[0021] Figure 2 for Figure 1A schematic diagram of direction AA;

[0022] Figure 3 This is a schematic diagram of the base;

[0023] Figure 4 This is a schematic diagram of the lifting plate;

[0024] Figure 5(a) and Figure 5(b) are the front view and left view of the lifting plate placement board, respectively.

[0025] In the diagram: 1-Dial indicator, 2-Support rod, 3-Adjusting frame, 4-Synchronizer shaft, 5-Lifting plate, 6-Pressing plate, 7-Synchronizer, 8-Tooling base, 9-Pressing plate support, 10-Base support foot, 11-Lifting plate placement plate, 12-Plate, 13-Fixed seat. Detailed Implementation

[0026] The specific embodiments of this utility model are further described below with reference to the accompanying drawings and technical solutions.

[0027] like Figure 1 and Figure 2 As shown, the special tooling for measuring the axial clearance of an aircraft synchronizer of this utility model includes a dial indicator 1, a support rod 2, an adjustment frame 3, a lifting plate 5, a pressure plate 6, a tooling base 8, a pressure plate support 9, and a lifting plate placement plate 11.

[0028] like Figure 3 As shown, the tooling base 8 is made of hard aluminum plate. To meet the fixing requirements of other components, it has mounting holes for the synchronizer 7, fixing threaded holes for the adjusting frame 3, fixing threaded holes for the pressure plate support 9, fixing threaded holes for the lifting plate placement plate 11, and fixing threaded holes for the base support legs 10. The tooling base 8 and the base support legs 10 are fixedly connected by threads. The four base support legs 10 are the same size to ensure that the base is level. The adjusting frame 3 is fastened to the tooling base 8 by threads. The support rod 2 is arranged horizontally, with one end fixed to the adjusting frame 3. The dial indicator 1 is installed on the other end of the support rod 2 and locked by threads. The adjustment frame 3 allows the support rod 2 to slide up and down, thereby adjusting the height of the dial indicator 1.

[0029] like Figure 4 As shown, the lifting plate 5 is made of stainless steel plate, and its main structure is a flat plate 12. A cylindrical fixing seat 13 for the synchronizer shaft 4 is welded to the center of the flat plate 12. Each end of the fixing seat 13 is equipped with a clamping fixing nail to clamp the synchronizer shaft 4, ensuring uniform force distribution. As shown in Figures 5(a) and 5(b), there are two lifting plate placement plates 11, which are L-shaped plates and are fixedly connected to the tooling base 8 by threads. The lifting plate 5 can be placed horizontally on the lifting plate placement plate 11, which helps to determine whether the synchronizer shaft is vertically fixed.

[0030] There are two tablet holders 9, both of which have threads. The lower end of the tablet holder 9 is fixedly connected to the tooling base 8 by threads. There are two tablets 6, which are installed on the upper end of the tablet holder 9 and further fixed by wing nuts.

[0031] In use, install synchronizer 7 on tooling base 8, pass the wires of synchronizer 4 through the mounting holes of tooling base 8, and install synchronizer shaft 4 upwards, taking care not to damage the wires. Press pressure plate 6 onto synchronizer 7 and tighten the wing nut. Fit the fixing seat 13 of lifting plate 5 onto synchronizer shaft 4 and tighten the clamping screw. Install dial indicator 1 onto support rod 2, ensuring the measuring axis of dial indicator 1 is vertically downwards, and then tighten the fixing nut of dial indicator 1. Move support rod 2 up and down using adjusting bracket 3 to align the measuring axis of dial indicator 1 with synchronizer shaft 4, and adjust the scale to zero. Raise lifting plate 5 up and down and observe the dial indicator reading; this value is the axial clearance value of synchronizer 7.

Claims

1. A special tooling for measuring the axial clearance of an aircraft synchronizer, characterized in that, The special tooling for measuring the axial clearance of the aircraft synchronizer includes a dial indicator (1), a support rod (2), an adjustment frame (3), a lifting plate (5), a pressure plate (6), a tooling base (8), a pressure plate support (9), and a lifting plate placement plate (11). The adjustment frame (3) is mounted on the upper surface of the tooling base (8); the support rod (2) is arranged horizontally, with one end mounted on the adjustment frame (3) and the dial indicator (1) mounted on the other end of the support rod (2); the height of the dial indicator (1) is adjusted by adjusting the height of the support rod (2) through the adjustment frame (3); There are two pressure plate supports (9), arranged vertically and symmetrically installed on the upper surface of the tooling base (8). The distance between the two pressure plate supports (9) is greater than the diameter of the synchronizer (7). There are two pressure plates (6), arranged horizontally and installed on the pressure plate supports (9) by wing nuts. The pressure plates (6) are used to press on the synchronizer (7) to further fix the synchronizer (7). There are two lifting plate placement plates (11), arranged vertically and symmetrically installed on the upper surface of the tooling base (8). The distance between the two lifting plate placement plates (11) is greater than the distance between the two pressing plate supports (9). The two ends of the lifting plate (5) are respectively located on the two lifting plate placement plates (11), including a flat plate (12) and a fixed seat (13). The center of the flat plate (12) is provided with a cylindrical through hole for installing the fixed seat (13). The fixed seat (13) is a cylindrical structure with an internal thread on the inner surface. During measurement, the fixed seat (13) is threadedly connected to the synchronizer shaft (4) and locked by a clamping screw. At this time, the lifting plate (5) is not located on the lifting plate placement plate (11). The tooling base (8) is provided with mounting holes for synchronizer shaft (4). The synchronizer (7) is installed between two pressure plate supports (9), and the synchronizer shaft (4) is coaxial with the measuring shaft of the fixed base (13) and the dial indicator (1).

2. The special tooling for measuring the axial clearance of an aircraft synchronizer according to claim 1, characterized in that, The tooling base (8) is threadedly connected to the adjustment frame (3), the pressing support (9), and the lifting plate (11).

3. The special tooling for measuring the axial clearance of an aircraft synchronizer according to claim 1 or 2, characterized in that, The lower surface of the tooling base (8) is fixedly connected to four base legs (10) by threads.

4. The special tooling for measuring the axial clearance of an aircraft synchronizer according to claim 1 or 2, characterized in that, The tooling base (8) is made of hard aluminum plate, and the lifting plate (5) is made of stainless steel.

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