Special tool for measuring axial clearance of aircraft synchronizer

Abstract

The invention 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] The invention belongs to the technical field of aviation equipment and relates to a special tool for measuring the axial clearance of an aircraft synchronizer. Background Art

[0002] Aircraft radio electromagnetic indicators are used to display information such as the aircraft's heading angle and the azimuth of the radio station. Each aircraft is equipped with two radio electromagnetic indicators, one in the front and rear cabins. During the overhaul process, it was found that the radio channel failure rate of this product was as high as 90%. The main phenomena were large errors, slow follow-up, and jamming of the radio channel pointer. The cause of the above failures was damage to the assembly synchronizer inside the product. However, the manufacturer of the synchronizer has a serious lack of production capacity and cannot meet the overhaul needs. Outsourcing repairs is expensive and the repair cycle cannot be guaranteed. According to the repair process requirements, the synchronizer must be accurately measured after repair to ensure that the synchronizer axial clearance is within the range of 0.07mm to 0.11mm to be qualified. Therefore, a special tooling for synchronizer axial clearance measurement is urgently needed.

[0003] The existing technology has a long and slender synchronizer shaft, a small axial clearance, and is easy to bend and deform. At the same time, the synchronizer can be fixed at a complex shape, so it is necessary to pay attention to the clamping method. The factory can provide a dial indicator and a meter stand, and the dial indicator is accurate.

[0004] Therefore, a special tool is needed to measure the axial clearance of the synchronizer after maintenance, so as to ensure the quality of the repair work of the aircraft wireless electromagnetic indicator. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a special tool for measuring the axial clearance of an aircraft synchronizer.

[0006] The technical solution of the present invention is as follows:

[0007] The special tooling for measuring the axial clearance of aircraft synchronizers comprises a dial indicator 1, a support rod 2, an adjustment frame 3, a lifting piece 5, a pressing piece 6, a tooling base 8, a pressing piece support 9 and a lifting piece placement plate 11.

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

[0009] There are two pressing plate supports 9, which are arranged vertically and symmetrically mounted on the upper surface of the tooling base 8. The distance between the two pressing plate supports 9 is greater than the diameter of the synchronizer 7. There are two pressing plates 6, which are arranged horizontally and mounted on the pressing plate supports 9 through butterfly nuts. The pressing 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, which are arranged vertically and symmetrically installed on the upper surface of the tooling base 8. The spacing between the two lifting plate placement plates 11 is greater than the spacing 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 fixing seat 13. The center of the flat plate 12 is provided with a cylindrical through hole for installing the fixing seat 13. The fixing seat 13 is a cylindrical structure with an internal thread on the inner surface. During measurement, the fixing 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 a mounting hole for the synchronizer shaft 4 , the synchronizer 7 is installed between two pressing plate supports 9 , and the synchronizer shaft 4 is coaxial with the fixing base 13 and the measuring axis of the dial indicator 1 .

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

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

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

[0015] Beneficial effects of the present invention:

[0016] (1) The tooling base is made of hard aluminum plate. In order to meet the needs of fixing other parts, it is equipped with synchronizer mounting holes, dial indicator frame fixing threads, pressure plate support fixing threads, lift plate placement plate fixing threads and base support foot fixing threads. The base and base support feet are fixedly connected by threads. The four base support feet have the same size to ensure 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. A clamping fixing pin is installed at each end of the fixing seat to clamp the synchronizer shaft and tighten the two ends to ensure uniform force.

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

[0019] (4) The present invention realizes accurate measurement of aircraft synchronizer axial clearance through mechanical operation, reduces aircraft maintenance costs, and ensures aircraft maintenance quality and repair progress. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a front view of the tooling of the present invention;

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

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

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

[0024] Fig. 5(a) and Fig. 5(b) are respectively the front view and the left view of the sheet lifting and placing plate.

[0025] In the figure: 1- dial indicator, 2- support rod, 3- adjustment frame, 4- synchronizer shaft, 5- lift plate, 6- press plate, 7- synchronizer, 8- tooling base, 9- press plate support, 10- base support foot, 11- lift plate placement plate, 12- flat plate, 13- fixed base. DETAILED DESCRIPTION

[0026] The specific implementation of the present invention is further described below in conjunction with the accompanying drawings and technical solutions.

[0027] like Figure 1 and Figure 2 As shown, the special tool for measuring the axial clearance of the aircraft synchronizer of the present invention includes a dial indicator 1, a support rod 2, an adjustment frame 3, a lifting plate 5, a pressing plate 6, a tool base 8, a pressing 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. In order to meet the fixing needs of the other parts, it is provided with mounting holes for the synchronizer 7, fixing threaded holes for the adjustment frame 3, fixing threaded holes for the pressing plate support 9, fixing threaded holes for the lifting plate placement plate 11 and fixing threaded holes for the base legs 10. The tooling base 8 is fixedly connected to the base legs 10 by threads. The four base legs 10 are of the same size to ensure that the base is level. The adjustment frame 3 is fastened to the tooling base 8 by threads. The support rod 2 is arranged horizontally, and one end of it is fixed on the adjustment frame 3. The dial indicator 1 is installed at the other end of the support rod 2 and the threads are locked. The support rod 2 can slide up and down through the adjustment frame 3, thereby adjusting the height of the dial indicator 1.

[0029] like Figure 4 As shown, the lifting plate 5 is made of a stainless steel plate, and its main structure is a flat plate 12. A cylindrical fixed seat 13 of the synchronizer shaft 4 is welded in the center of the flat plate 12. A clamping and fixing nail is installed at each end of the fixed seat 13 to clamp the synchronizer shaft 4. The two ends are clamped to ensure uniform force. 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 can help determine whether the synchronizer shaft is fixed vertically.

[0030] There are two pressing plates support 9, both upper and lower ends of the pressing plates support 9 are threaded, and the lower end is fixedly connected with the tooling base 8 by threads. There are two pressing plates 6, which are mounted on the upper end of the pressing plates support 9 and further fixed by butterfly nuts.

[0031] When in use, install the synchronizer 7 on the tooling base 8, pass the wires of the synchronizer 4 through the mounting holes of the tooling base 8, and install the synchronizer shaft 4 upwards. Be careful not to damage the wires at this time. Press the pressing plate 6 onto the synchronizer 7 and tighten the butterfly nut. Slide the fixing seat 13 of the lifting plate 5 onto the synchronizer shaft 4 and tighten the clamping screw. Install the dial indicator 1 onto the support rod 2, and tighten the fixing nut of the dial indicator 1 after the measuring axis of the dial indicator 1 is vertically downward. Move the support rod 2 up and down through the adjustment frame 3 to align the measuring axis of the dial indicator 1 with the synchronizer shaft 4, and adjust the scale value to zero. Lift the lifting plate 5 up and down, and observe the indication of the dial indicator. This value is the axial clearance value of the synchronizer 7.

Claims

1. Special tooling for measuring the axial clearance of aircraft synchronizers, characterized in that: The special tooling for measuring the axial clearance of an aircraft synchronizer comprises a dial indicator (1), a support rod (2), an adjustment frame (3), a lifting plate (5), a pressing plate (6), a tooling base (8), a pressing plate support (9) and a lifting plate placement plate (11); The bottom of the adjusting frame (3) is mounted on the upper surface of the tooling base (8); the support rod (2) is arranged horizontally, one end of which is mounted on the adjusting frame (3), and the dial indicator (1) is mounted on the other end of the support rod (2); the height of the support rod (2) is adjusted by the adjusting frame (3), thereby adjusting the height of the dial indicator (1); There are two pressing plate supports (9), which are arranged vertically and symmetrically mounted on the upper surface of the tooling base (8), and the distance between the two pressing plate supports (9) is greater than the diameter of the synchronizer (7); there are two pressing plates (6), which are arranged horizontally and mounted on the pressing plate supports (9) through butterfly nuts, and the pressing plates (6) are used to press on the synchronizer (7) to further fix the synchronizer (7); There are two lifting plate placement plates (11), which are arranged vertically and symmetrically installed on the upper surface of the tooling base (8). The spacing between the two lifting plate placement plates (11) is greater than the spacing 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. When measuring, 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 a mounting hole for the synchronizer shaft (4), the synchronizer (7) is mounted between two pressing plate supports (9), and the synchronizer shaft (4) is coaxial with the fixing base (13) and the measuring axis of the dial indicator (1).

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

3. The special tool for measuring the axial clearance of aircraft synchronizers 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) via threads.

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

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