Engine coaxiality inspection device

Abstract

The utility model relates to the field of transmission system installation, in particular to an engine coaxiality inspection device. The device comprises an auxiliary bracket and a fixed support, during use, the auxiliary support is fixed to the power transmission shaft, and the inner side of the auxiliary support is attached to the outer surface of the power transmission shaft. During installation, the auxiliary support is tied to the power shaft through a tying belt. A fixing support is arranged on the auxiliary support, a groove is formed in the top end of the fixing support, and the groove is used for being in positioning fit with a non-standard detection gauge outfit; a notch is formed in the middle of the support, and a tying belt penetrates through the notch during installation to fix the non-standard detection gauge outfit on the groove.

Description

Technical Field

[0001] The utility model relates to the field of transmission system installation, and particularly relates to a device for checking the coaxiality of an engine. Background Art

[0002] At present, when adjusting the coaxiality of a certain type of helicopter engine, an engine simulation part needs to be installed. The weight and center of gravity of the engine simulation tooling are the same as those of the engine. The engine simulation part needs to be connected to the engine bracket, and the other end is connected to the sleeve of the helicopter power shaft. The main reduction input target plate is used to simulate the engine output axis and the main reduction input axis. Then, by measuring the center deviation between the center crosshair of the measuring telescope and the two target plates, it is possible to check whether the concentricity of the engine output shaft and the main reduction input shaft meets the assembly requirements.

[0003] Since the engine simulation tooling is large in volume, heavy in weight, inconvenient to carry, and has cumbersome operation and low assembly efficiency, it directly affects the assembly progress of the transmission system of a certain type of helicopter. Therefore, with the company's helicopter scientific research and mass production requirements, there is an urgent need to develop a set of adjustment devices for engine coaxiality that are small, light, convenient to carry, and easier to implement on-site troubleshooting. Summary of the Invention

[0004] Object of the Invention: To design a device for measuring and adjusting the angular deviation of the power shaft, which can make the inspection and adjustment processes of coaxiality more convenient, improve the assembly efficiency, and thus meet the adjustment requirements of engine coaxiality.

[0005] Technical Solution

[0006] The utility model provides an engine coaxiality inspection device, including: an auxiliary bracket and a fixed support;

[0007] The auxiliary bracket conforms to the shape of the power transmission shaft. When in use, the auxiliary bracket is fixed on the power transmission shaft, and the inner side is attached to the outer surface of the power shaft; when installing, the auxiliary bracket is tied to the power shaft with a lacing;

[0008] A fixed bracket is arranged on the auxiliary bracket, and a groove is arranged at the top end of the fixed support. The groove is used for positioning and cooperating with the non-standard inspection meter head; a notch is arranged in the middle of the support. When installing, the lacing is passed through the notch to fix the non-standard inspection meter head on the groove.

[0009] The device further includes: a positioning boss;

[0010] The positioning bosses are arranged at the front and rear ends of the auxiliary bracket, and the axes of the two positioning bosses are parallel to the axis of the auxiliary bracket;

[0011] The lacing for tying the auxiliary bracket needs to be wound around the auxiliary bracket between the fixed support and the boss.

[0012] The device further includes: a film pasted on the auxiliary bracket.

[0013] The auxiliary support is made of aluminum alloy through machining.

[0014] When the engine coaxiality inspection device is used in conjunction with a high-precision non-standard inspection instrument, when the power transmission shaft rotates one circle, the angular deviation value is read through the laser ranging of the pointer of the high-precision non-standard inspection tool.

[0015] Calculation formula for angular deviation αESG:

[0016] αESG = arctan(X / 2R);

[0017] Wherein, R is the distance between the axis of the drive shaft mounting bolt and the axis of the drive shaft, and X is the yaw value read by the high-precision non-standard inspection device.

[0018] Beneficial effects:

[0019] The device has a simple structure and is easy to operate. When operating, there is no need to install an engine simulation part. The device can be directly used in conjunction with a high-precision non-standard inspection instrument to detect the angular deviation value, and then the adjustment can be directly carried out according to the measured value. This avoids the large workload of disassembling and assembling the engine simulation part and installing the engine, can meet the adjustment requirements of a certain type of helicopter transmission system, ensure the reliability of the adjustment process and improve work efficiency. At the same time, it enables the troubleshooting in the field to be completed more easily, greatly saves manpower, and greatly improves the assembly efficiency. Description of the drawings

[0020] Figure 1 is a physical schematic diagram of the coaxiality adjustment device; Figure 1 ;

[0021] Figure 2 is a physical schematic diagram of the coaxiality adjustment device; Figure 2 ;

[0022] Figure 3 is a connection schematic diagram of the coaxiality adjustment device and the drive shaft;

[0023] Figure 4 is a schematic diagram of the conversion formula for angular deviation and yaw measurement value;

[0024] Among them, 1 - auxiliary support, 2 - positioning boss, 3 - film, 4 - fixed support. Detailed implementation manners

[0025] Through research and development, an installation and adjustment device for the coaxiality of the helicopter power transmission shaft system is developed to solve the difficult problem of low assembly efficiency of the simulation tooling. It can conveniently measure the concentricity of the engine output shaft and the main reduction input shaft, achieve rapid and accurate inspection and convenient operation and adjustment, and meet the assembly quality and progress requirements for the coaxiality adjustment of the helicopter engine.

[0026] The utility model provides a device for checking the coaxiality of an engine, as Figures 1-3 shown, which includes an auxiliary bracket 1, a positioning boss 2, a film 3, and a fixed support 4.

[0027] Among them, the auxiliary bracket 1 is made of aluminum alloy through machining and is semi-cylindrical. The diameter of the semi-cylinder is designed according to the diameter of the installed transmission shaft. When in use, after the transmission shaft is installed, the inner side of the semi-cylindrical shape of the auxiliary bracket 1 is fitted to the outer circular surface of the power shaft, and it is fixed on the power transmission shaft by pressing with the positioning boss 2 and the film 3. It is used in cooperation with a high-precision non-standard detection instrument, and the non-standard meter head is fixed on the fixed support 4. The power transmission shaft is rotated one circle, and the angular deviation value is read out through the laser ranging of the needle of the high-precision non-standard detection tool.

[0028] More specifically, positioning bosses 2 are arranged at both ends of the outer side of the cylindrical surface of the auxiliary bracket 1. When installing, the auxiliary bracket is tied to the power shaft with a lace, and the positioning boss 2 is used to prevent the lace from slipping off;

[0029] More specifically, a film 3 is pasted at the joint surface between the auxiliary bracket 1 and the transmission shaft. When designing, the thickness of the film 3 is taken into account in the total radius. The film 3 is used to avoid damaging the shaft when installing the auxiliary bracket;

[0030] More specifically, a fixed support 4 is arranged at the extension end of the auxiliary bracket 1. A groove is arranged at the top of the fixed support 4 for positioning and matching with the non-standard detection meter head. A notch is arranged in the middle of the support. When installing, a lace is passed through the notch to fix the non-standard detection meter head on the support. The meter head is aligned with the end face of the installation bolt head of the transmission shaft, and the angular deviation value is read out through the laser ranging of the needle of the high-precision non-standard detection tool.

[0031] More specifically, as Figure 4 shown, through the angular deviation calculation formula: αESG = arctan(X / 2R), where R is the distance between the axis of the installation bolt of the transmission shaft and the axis of the transmission shaft, and the X value is the yaw value read out by the high-precision non-standard detection device. The coaxiality is qualified if it satisfies the X value formula converted to X ≤ 2R(tanαESG).

[0032] Example: For a certain type of engine, the size of the transmission shaft R = 52mm, and αESG = 4'. Substituting into the formula, it can be calculated that X ≤ 0.12mm = 120μm; that is, the reading of the high-precision non-standard detection device needs to be ≤ 120μm. If not satisfied, the coaxiality can be adjusted to be qualified according to the detection result.

[0033] Technical effects of the utility model: The device has a simple structure and is easy to operate. When operating, there is no need to install an engine simulation component. This device can be directly used in combination with a high-precision non-standard detection instrument to detect the angular deviation value, and then adjustments can be directly made according to the measured value. This avoids the large workload of disassembling and assembling the engine simulation component and installing the engine, can meet the adjustment requirements of a certain type of helicopter transmission system, ensure the reliability of the adjustment process and improve work efficiency. At the same time, it enables the troubleshooting in the field to be completed more easily, greatly saves manpower, and greatly improves the assembly efficiency.

Claims

1. An engine coaxiality inspection device, characterized in that: include: Auxiliary support (1), fixed support (4); The auxiliary bracket (1) is formed in the same shape as the power transmission shaft. When in use, the auxiliary bracket (1) is fixed on the power transmission shaft, with the inner side being in contact with the outer surface of the power shaft; During installation, tie the auxiliary bracket to the power shaft with a tie strap; A fixed bracket is arranged on the auxiliary bracket (1), and a groove is arranged on the top of the fixed support (4), and the groove is used for positioning and matching with the non-standard detection meter head; a notch is arranged in the middle of the support, and a tie is used to pass through the notch during installation to fix the non-standard detection meter head on the groove.

2. The device according to claim 1, characterized in that Also includes: Positioning boss (2); The positioning bosses (2) are arranged at the front and rear ends of the auxiliary bracket (1), and the axes of the two positioning bosses (2) are parallel to the axis of the auxiliary bracket (1); The tie strap for tying the auxiliary bracket needs to be wound around the auxiliary bracket (1) between the fixed support (4) and the positioning boss (2).

3. The device according to claim 1, characterized in that Also includes: The film (3) is attached to the auxiliary bracket (1).

4. The device according to claim 1, characterized in that The auxiliary bracket (1) is made of aluminum alloy through machining.

5. The device according to claim 1, characterized in that When the engine coaxiality inspection device is used in conjunction with a high-precision non-standard testing instrument, the power transmission shaft rotates one circle, and the angular deviation value is read out through the high-precision non-standard testing tool needle laser ranging.

6. The device according to claim 5, characterized in that Angular deviation αESG calculation formula: αESG = arctan(X / 2R); Among them, R is the distance between the axis of the transmission shaft mounting bolt and the axis of the transmission shaft, and X is the runout value read by the high-precision non-standard detection device.

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