Helicopter assembly aligning tool

Abstract

The utility model provides a helicopter assembly aligning tool which comprises a bearing support 1, an aligning support 3 and a lever dial indicator 5, the aligning support 3 is fixed to a left transmission shaft through a support fixing bolt 2, and the lever dial indicator 5 is fixed to the aligning support 3 through a dial indicator fixing bolt 4. The bearing support 1 adjusts the coaxiality of the transmission shaft by increasing or decreasing gaskets; the aligning support 3 is used for adjusting the coaxiality between the two transmission shafts of the helicopter, and the height of the opening groove fixing position of the aligning support is adjusted according to the actual conditions of the transmission shafts of the helicopter.

Description

Technical Field

[0001] The utility model belongs to the technical field of transmission alignment. In particular, it relates to an alignment tooling for helicopter assembly. Background Technique

[0002] At present, methods for aligning and measuring the coaxiality of a drive shaft include the wire-pulling method, the coordinate measuring machine, and the comprehensive gauge method. Among them, the wire-pulling method has defects such as low accuracy and a large influence of human subjective factors. Although the coordinate measuring machine has high measurement accuracy, due to the large volume of the equipment itself and high requirements for the measurement environment, the equipment to be detected needs to be disassembled and placed on its operating table for detection, which increases the operation difficulty and inconvenience. At the same time, the coordinate measuring machine itself is also relatively expensive. The comprehensive gauge method has the characteristics of small volume, high accuracy, convenient operation, simple operation, and low cost.

[0003] In recent years, in view of the needs of the combat preparation situation, the flight training of the troops has been continuously increasing, and the probability of various types of helicopters encountering serious damage has gradually increased. Among them, the probability of damage and replacement of the drive shaft will also continue to increase. In order to meet the rapid repair work of the drive shaft of severely damaged helicopters, ensure the training needs of the troops, and restore the combat effectiveness of the helicopters, there is an urgent need for a helicopter rapid transmission alignment technology with simple operation method, strong operability, and capable of being implemented in the field. Content of the Utility Model

[0004] The technical problem to be solved by the utility model: The utility model provides an alignment tooling for helicopter assembly, which can provide a rapid coaxiality detection tooling for helicopters with high precision, compact structure, small operation space, and diaphragm coupling drive.

[0005] The technical solution of the utility model: An alignment tooling for helicopter assembly, the alignment tooling for helicopter assembly includes a bearing support 1, an alignment bracket 3, and a lever dial indicator 5, wherein:

[0006] The alignment bracket 3 is fixed on the left drive shaft through a bracket fixing bolt 2, the lever dial indicator 5 is fixed on the alignment bracket 3 through a dial indicator fixing bolt 4, and the bearing support 1 adjusts the coaxiality of the drive shaft by adding or reducing shims;

[0007] The alignment bracket 3 is used to adjust the coaxiality between the two drive shafts of the helicopter, and the height of the fixed part of the open slot of the alignment bracket is adjusted according to the actual situation of the helicopter drive shaft.

[0008] Specifically, the bearing support 1 is an interference fit assembly of a bearing and the alignment bracket 3, and the drive shaft passes through the bearing, and the bracket in interference fit with the bearing is fixed on the helicopter platform.

[0009] Specifically, the bearing support 1 is an aluminum bearing support.

[0010] Specifically, the alignment bracket 3 is a 7075 aviation aluminum alignment bracket.

[0011] Specifically, the lever dial indicator 5 is used to measure the mutual position error of the transmission shaft during one full rotation.

[0012] Specifically, the alignment support 3 is provided with an opening at the fixing position of the lever dial indicator 5 to ensure that the dial indicator can adjust its measuring angle according to actual needs.

[0013] The beneficial effects of the present utility model are as follows: ① Rapidly detect coaxiality without disassembling moving parts; ② Rapidly detect coaxiality in a limited space; ③ The movable freedom design enables the free adjustment of the angle of the lever dial indicator and the height of the alignment support. The present utility model is a transmission alignment tooling designed for a helicopter with a transmission shaft, which has the functions of freely adjusting the angle and height, is convenient for installation and disassembly, has high measurement accuracy, can meet the coaxiality detection requirements in a limited space, and provides highly reliable detection data for the alignment of the transmission shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic structural diagram of a helicopter assembly alignment tooling provided by the present application;

[0015] Figure 2 It is a schematic structural diagram of another helicopter assembly alignment tooling provided by the present application;

[0016] Wherein: 1 - bearing support; 2 - support fixing bolt; 3 - alignment support; 4 - dial indicator fixing bolt; 5 - lever dial indicator. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] The transmission alignment technology involved in the present utility model adjusts the coaxiality by adjusting the bearing support 1, and gaskets can be added or subtracted at its bottom. A transmission alignment support 3 is required to fixedly connect two transmission shafts, with one end being the support and the other end being the lever dial indicator 5. At the same time, the perpendicularity direction requirements of the two connection surfaces also need to be ensured. There are many current transmission shaft alignment solutions, but the present utility model is an alignment solution for fixedly connecting and transmitting two transmission shafts of a helicopter with a diaphragm coupling drive, which has a compact structure, can adjust the height and angle simultaneously, is convenient and fast, can be applied to the transmission alignment in a narrow space, and achieves the purpose of adjusting the transmission alignment without disassembling other moving parts.

[0018] Embodiment 1

[0019] The present utility model provides a helicopter transmission shaft alignment tooling, including a bearing support 1, an alignment support 3, and a lever dial indicator 5, wherein:

[0020] The alignment support 3 is fixed on the left transmission shaft through the support fixing bolt 2, the lever dial indicator 5 is fixed on the alignment support 3 through the dial indicator fixing bolt 4, and the bearing support 1 adjusts the coaxiality of the transmission shaft by adding or subtracting gaskets.

[0021] Specifically, the bearing support 1 is an interference fit assembly of a bearing and a bracket. The transmission shaft is fixed to the helicopter platform through the bearing and the bracket that is in interference fit with the bearing.

[0022] Specifically, the bearing support 1 is an aluminum bearing support 1.

[0023] In practical applications, a relatively high precision is selected for the bearing, and the assembly with the bracket can also meet the requirements of coaxiality and perpendicularity, ensuring that it does not interfere with the coaxiality adjustment of the transmission shaft itself. At the same time, considering the problem of gravity, in addition to supporting the height of the transmission shaft and not affecting rotation, the bearing support 1 has also been designed for weight reduction in terms of structure, and aluminum parts are selected for manufacturing.

[0024] The alignment bracket 3 is a machined part used to adjust the coaxiality between two transmission shafts of the helicopter. The fixed position of the open slot of the alignment bracket 3 is adjusted in height according to the actual situation of the helicopter transmission shaft. At the same time, an opening is provided at the fixed position of the dial indicator of the alignment bracket 3 to ensure that the dial indicator can adjust its measuring angle according to actual needs.

[0025] Specifically, the alignment bracket 3 is a 7075 aviation aluminum alignment bracket 3.

[0026] In practical applications, the alignment bracket 3 is suitable for coaxiality measurement in different temperature environments. Since the bracket is a fixed part, existing bolts on the helicopter transmission shaft can be selected for fixation during use, and all structures on the helicopter can be avoided during the adjustment process. The fixed position of the open slot of the alignment bracket 3 can be adjusted in height according to the actual situation of the helicopter transmission shaft. At the same time, an opening design is also selected for the fixed position of the dial indicator of the alignment bracket 3 to ensure that the dial indicator can adjust its measuring angle according to actual needs. The design with two degrees of freedom enables this bracket to be suitable for the adjustment requirements of transmission shafts of various models of helicopters. Considering lightweight, the non-essential parts of the structure have been optimized, 7075 aviation aluminum is selected for the material, and at the same time, corresponding rib designs are made to ensure sufficient rigidity during use.

[0027] The lever dial indicator 5 is used to measure the mutual position error of the transmission shaft during one full rotation.

[0028] It should be noted that the lever dial indicator 5 is also known as a lever gauge or a contact gauge. It is a measuring instrument that uses a lever-gear transmission mechanism or a lever-screw transmission mechanism to convert dimensional changes into angular displacements of the pointer and indicate the length dimension value. It is used to measure the mutual position error of the transmission shaft during one full rotation and make comparisons. The lever dial indicator includes three types: front type, side type, and end face type. The front type lever dial indicator 5 is selected in this patent because of its small size and high precision, which is suitable for places with a compact structure and small measurement space in the helicopter transmission system.

[0029] The utility model adopts the comprehensive gauge method to design a tooling fixture to fix the measuring tool used, so that the coaxiality of the transmission shaft can be effectively measured without removing the transmission shaft. Considering the high precision and complexity of the helicopter transmission shaft, the designed measuring tool is required to have an accuracy of 0.01 mm, that is, an ordinary lever dial indicator can meet the use requirements. The designed tooling fixture has two degrees of freedom, namely fixed height adjustment and measuring angle adjustment of the measuring tool. At the same time, the volume of the tooling fixture cannot be too large, and the designed envelope size is 103 mm * 20 mm * 54 mm, as shown in the figure below, and it is necessary to bypass the elastic flange, fuselage structure, installation bolts, etc. between the helicopter transmission shafts. For the installation of the scheme, using the existing bolts on the helicopter transmission shaft, the tooling fixture is fixed by bolts in an open slot type, so that the bolts do not need to be completely unscrewed, and only need to be loosened to the clamping thickness of the tooling fixture.

[0030] In practical applications, the helicopter transmission shaft includes a left transmission shaft and a right transmission shaft. Compared with a whole transmission shaft, the segmented transmission can improve the rigidity of the transmission shaft, ensure the straightness of the shaft parts, and reduce the processing difficulty of the parts. At the same time, the later maintenance can also be carried out in segments, which can improve the maintenance efficiency of the helicopter and ensure the training needs of the troops for the helicopter.

[0031] Embodiment 2

[0032] The utility model provides a debugging method for the transmission shaft alignment tooling fixture, and the implementation steps are as follows:

[0033] Step 1: Fix the alignment bracket 3 on the left transmission shaft with the bracket fixing bolt 2;

[0034] Step 2: Fix the lever dial indicator 5 on the alignment bracket 3 through the dial indicator fixing bolt 4;

[0035] Step 3: Make the head of the lever dial indicator 5 contact with the right transmission shaft, rotate the head of the lever dial indicator 5 for one week, then gently press the head and there is a data change, and it can return to the original position after releasing the hand;

[0036] Step 4: Rotate the transmission shaft for one circle and record the reading range of the lever dial indicator 5;

[0037] Step 5: Judge whether the coaxiality meets the requirements according to the reading range of the lever dial indicator 5. If it does not meet the requirements, it can be adjusted by increasing or decreasing the shims at the bottom of the bearing support 1, and repeat steps 4 and 5;

[0038] Specifically, Step 5 includes: The coaxiality can be converted through trigonometric functions, and the angle value can be correspondingly converted into the displacement of the dial indicator generated. For example, the displacement requirement of the lever dial indicator should be controlled within 1 mm. If it is found during the measurement process that after the lever dial indicator rotates one full circle, the displacement change is 0.93 mm, it indicates that the displacement limit requirement is met, that is, the coaxiality requirement is met. If the displacement change is 1.03 mm, it indicates that the displacement limit requirement is not met. At this time, the transmission shaft needs to be adjusted. After adjustment, the pressing position of the lever dial indicator needs to be readjusted to ensure that it is within a certain pressing amount range, such as pressing 0.8 mm. Otherwise, during the rotation of the transmission shaft, the dial head of the lever dial indicator will be disengaged from the transmission shaft, and the measured data will be unusable or misused. After ensuring that the pressing is correct, the measurement can continue.

[0039] Step 6: Disassemble the centering tooling for the transmission shaft.

[0040] In summary, the present utility model provides a centering tooling for a helicopter transmission shaft, which can quickly measure the coaxiality of the helicopter transmission shaft within a narrow space range. It can also measure the coaxiality of the transmission shaft without disassembling the transmission shaft, and has no requirements for the environment such as temperature and humidity. And it does not require electricity, can be used for a long time effectively, and is easy to store. At the same time, the centering tooling is provided with two degrees of freedom, which can adjust the height of the bracket and the angle of the lever dial indicator. Therefore, it is applicable to multiple types of helicopters. When the adjustment and maintenance amount of the helicopter transmission system is large, this utility model patent can quickly and effectively solve the problem of adjusting and maintaining the helicopter transmission shaft, and effectively guarantee the combat effectiveness of the helicopter.

Claims

1. A helicopter assembly centering tooling, characterized in that, The helicopter assembly centering tooling includes a bearing support (1), a centering bracket (3), and a lever dial indicator (5), where: The centering bracket (3) is fixed on the left transmission shaft through a bracket fixing bolt (2), the lever dial indicator (5) is fixed on the centering bracket (3) through a dial indicator fixing bolt (4), and the coaxiality of the transmission shaft is adjusted by adding or reducing shims to the bearing support (1); The centering bracket (3) is used to adjust the coaxiality between the two transmission shafts of the helicopter, and the height of the fixed part of the opening slot of the centering bracket is adjusted according to the actual situation of the helicopter transmission shaft.

2. The helicopter assembly centering tooling according to claim 1, wherein The bearing support (1) is an interference fit assembly of the bearing and the centering bracket (3), and the transmission shaft is fixed on the helicopter platform through the bearing and the bracket that is in interference fit with the bearing.

3. The helicopter assembly centering tooling according to claim 1, characterized in that, The bearing support (1) is an aluminum bearing support.

4. The helicopter assembly centering tooling according to claim 1, wherein The centering bracket (3) is a 7075 aviation aluminum centering bracket.

5. The helicopter assembly centering tooling according to claim 1, wherein, The lever dial indicator (5) is used to measure the mutual position error of the transmission shaft during one revolution.

6. The helicopter assembly centering tooling according to claim 1, characterized in that, The centering bracket (3) is provided with an opening at the fixed position of the lever dial indicator (5) to ensure that the dial indicator can adjust its measuring angle according to actual needs.

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