Engine axial distance measurement method, control method and measurement device

Abstract

This disclosure relates to a method, control method, and measuring device for measuring engine axial distance. The measurement method includes: establishing a first reference plane (6) perpendicular to the engine axial direction; and measuring the distance U from the first reference plane (6) to the first plane to be measured through multiple first measuring holes (11) on the first reference plane (6). i And obtain the angular positions α of multiple first measuring holes (11). i The distance V from the first reference plane (6) to the second plane to be measured is measured through multiple second measuring holes (12). j And obtain the angular position β of multiple second measuring holes (12). j ; Using distance U i and angular position α i Construct a second reference plane and establish a three-dimensional coordinate system; set the distance V... j The distance W is obtained by transforming to a three-dimensional coordinate system. j and utilize distance W j and angular position β j Construct a third reference plane, and determine the axial distance between the first and second planes to be measured based on the coordinates of the intersection point of the third reference plane and the third direction.

Description

Technical Field

[0001] This disclosure relates to the field of engine parameter measurement, and in particular to a method, control method and measuring device for measuring engine axial distance. Background Technology

[0002] The assembly quality of an aero-engine determines its overall performance. During the assembly process, the axial distance between the high-pressure compressor rotor and stator is a critical dimension affecting the compressor's aerodynamic performance and the overall engine operation. Therefore, accurate measurement and control of this axial distance during assembly are essential to ensuring the quality of the aero-engine assembly.

[0003] In the related technologies known to the inventor, the axial distance between the rear mounting plane of the fan casing and the rear mounting plane of the central drive gearbox is measured by averaging the axial distances at multiple locations. Then, the size of the adjusting shim between the compressor rotor and the central drive gearbox is adjusted to control the axial distance between the rotor and stator. However, this method of axial distance measurement and control has certain errors. Summary of the Invention

[0004] The embodiments of this disclosure provide an engine axial distance measurement method, control method, and measurement device, which can reduce errors and achieve accurate measurement and control of engine axial distance.

[0005] According to a first aspect of this disclosure, a method for measuring engine axial distance is proposed, comprising:

[0006] A first reference plane perpendicular to the engine axis is established, and multiple first measuring holes and multiple second measuring holes are provided on the first reference plane;

[0007] The distance U from the first reference plane to the first plane to be measured is measured through multiple first measuring holes. i And obtain the angular positions α of multiple first measuring holes. i , i = 1, 2, 3…m;

[0008] The distance V from the first reference plane to the second plane to be measured is measured through multiple second measuring holes. j And obtain the angular positions β of multiple second measuring holes. j j = 1, 2, 3…n;

[0009] Using distance U i and angular position α i Construct a second reference plane, and establish a three-dimensional coordinate system with a third direction consistent with the axis and a first and second direction perpendicular to each other in the second reference plane;

[0010] Distance V jTransform to a three-dimensional coordinate system to obtain the distance W between each measurement point on the second plane to be measured and the second reference plane. j and utilize distance W j and angular position β j Construct a third reference plane, and determine the axial distance between the first and second planes to be measured based on the coordinates of the intersection point of the third reference plane and the third direction.

[0011] In some embodiments, using distance U i and angular position α i Constructing the second reference plane includes:

[0012] For distance U i and angular position α i The fitted plane equation for the second reference plane is obtained by fitting the data using the least squares method, to represent the second reference plane; and / or

[0013] Using distance W j and angular position β j Constructing the third reference plane includes:

[0014] For distance W j and angular position β j The fitted plane equation of the third reference plane is obtained by fitting the data using the least squares method, which represents the third reference plane.

[0015] In some embodiments, the distance V from the first reference plane to the second plane to be measured is... j Transformation to a three-dimensional coordinate system includes:

[0016] The distance V from the first reference plane to the second plane to be measured is transformed using a transformation matrix. j When transformed into a three-dimensional coordinate system, the transformation matrix is ​​related to θ1 and θ2, where θ is the angle between the first reference plane and the second reference plane, θ1 is the projection angle of the angle θ in the plane perpendicular to the first direction, and θ2 is the projection angle of the angle θ in the plane perpendicular to the second direction.

[0017] In some embodiments, a plurality of first measuring holes and a plurality of second measuring holes are respectively distributed along a first pitch circle and a second pitch circle, the first pitch circle and the second pitch circle are concentric, and the radius of the first pitch circle is greater than the radius of the second pitch circle.

[0018] In some embodiments, a plurality of first measuring holes and a plurality of second measuring holes are grouped together, with each group including a first measuring hole and a second measuring hole located in the same radial direction.

[0019] In some embodiments, the origin of the three-dimensional coordinate system is located on the central axis of the engine.

[0020] In some embodiments, the first reference plane is located axially outside the first and second test planes.

[0021] In some embodiments, the first plane to be measured is the rear mounting plane of the fan housing, and the second plane to be measured is the rear mounting plane of the central drive gearbox. In the engine intake direction, the first reference plane is located axially behind the rear mounting plane of the fan housing.

[0022] In some embodiments, it also includes:

[0023] During the measurement of the engine axial distance, an axial force is applied to the front end of the drive bevel gear of the central drive gearbox to eliminate bearing clearance in the central drive gearbox.

[0024] According to a second aspect of this disclosure, an engine axial distance control method is proposed, comprising:

[0025] The axial distance is measured according to the axial distance measurement method of the above embodiment;

[0026] The size of the adjusting shim is calculated based on the axial distance. The adjusting shim is located between the compressor rotor and the central drive gearbox. The size of the adjusting shim = axial distance - half of the bearing axial clearance - theoretical axial size.

[0027] Adjust the shim according to its size to control the engine axial distance.

[0028] According to a third aspect of this disclosure, an engine axial distance measuring device is proposed to implement the engine axial distance measuring method of the above embodiments. The axial distance measuring device includes a plate, any side of the plate along its own thickness direction serves as a first reference plane, and the plate is provided with a plurality of first measuring holes and a plurality of second measuring holes.

[0029] In some embodiments, a plurality of first measuring holes and a plurality of second measuring holes are distributed along a first pitch circle and a second pitch circle, respectively, the first pitch circle and the second pitch circle are concentric, and the radius of the first pitch circle is larger than that of the second pitch circle.

[0030] In some embodiments, a plurality of first measuring holes and a plurality of second measuring holes are grouped together, with each group including a first measuring hole and a second measuring hole located in the same radial direction.

[0031] Based on the above technical solution, the engine axial distance measurement method of this disclosure replaces the average distance of multiple measurement points by directly calculating the distance between the first and second measured planes. It uses the first reference plane as a precision plane as a unified reference for measurement, and obtains the corresponding distance and angle positions by using the first and second measuring holes on the first reference plane. By constructing a second reference plane, a three-dimensional coordinate system, and a third reference plane to calculate the axial distance, the error is greatly reduced and the measurement accuracy of the engine axial distance is significantly improved. Attached Figure Description

[0032] The accompanying drawings, which are included to provide a further understanding of this disclosure and form part of this application, illustrate exemplary embodiments of this disclosure and are used to explain this disclosure, but do not constitute an undue limitation of this disclosure. In the drawings:

[0033] Figure 1 This is a schematic diagram of the axial dimensions of the high-pressure compressor stator in some embodiments of this disclosure.

[0034] Figure 2 This is a schematic diagram of some embodiments of the engine axial distance measurement principle disclosed herein.

[0035] Figure 3 This is a flowchart illustrating some embodiments of the engine axial distance measurement and control method disclosed herein.

[0036] Figure 4 This is a schematic diagram of the structure of some embodiments of the engine axial distance measuring device disclosed herein.

[0037] Explanation of reference numerals in the attached figures

[0038] 1. Rotor; 2. Stator; 3. Adjusting shim; 4. Fan housing; 5. Central drive gearbox; 6. First reference plane; 7. First plane to be measured; 8. Second plane to be measured; 9. Drive bevel gear of central drive gearbox; 10. Bearing; 11. First measuring hole; 12. Second measuring hole; 13. First pitch circle; 14. Second pitch circle. Detailed Implementation

[0039] The present disclosure is described in detail below. In the following paragraphs, different aspects of the embodiments are defined in more detail. The aspects so defined may be combined with any other aspect or aspects unless expressly stated otherwise. In particular, any feature considered preferred or advantageous may be combined with one or more other features considered preferred or advantageous.

[0040] The terms "first" and "second" used in this disclosure are merely for ease of description and to distinguish different components with the same name, and do not indicate a sequential or primary / secondary relationship.

[0041] In the description of this disclosure, it should be understood that the terms “inner,” “outer,” “upper,” “lower,” “left,” “right,” “front,” and “rear,” etc., which indicate orientation or positional relationship, are defined based on objects such as the plane to be measured, the reference plane, or the axial mounting direction of the engine, and are only for the convenience of describing this disclosure, and are not intended to indicate or imply that the device referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this disclosure.

[0042] This disclosure provides a method for measuring the axial distance of an engine, such as Figures 1 to 4 As shown, it includes:

[0043] A first reference plane 6 perpendicular to the engine axis is established, and a plurality of first measuring holes 11 and a plurality of second measuring holes 12 are provided on the first reference plane 6;

[0044] The distance U between the first reference plane 6 and the first plane to be measured 7 is measured through multiple first measuring holes 11. i And obtain the angular positions α of multiple first measuring holes 11. i , i = 1, 2, 3…m;

[0045] The distance V from the first reference plane 6 to the second plane to be measured 8 is measured through multiple second measuring holes 12. j And obtain the angular positions β of multiple second measuring holes 12. j j = 1, 2, 3…n;

[0046] Using distance U i and angular position α i Construct a second reference plane, and establish a three-dimensional coordinate system with a third direction consistent with the axis and a first and second direction perpendicular to each other in the second reference plane;

[0047] Distance V j Transform to a three-dimensional coordinate system to obtain the distance W between each measurement point on the second measured plane 8 and the second reference plane. j and utilize distance W j and angular position β j Construct a third reference plane, and determine the axial distance between the first test plane 7 and the second test plane 8 based on the coordinates of the intersection point of the third reference plane and the third direction.

[0048] In this embodiment, the distance U from the plurality of first measuring holes 11 to the first plane to be measured 7 is... i , where V is the distance from the center measuring point of the plurality of first measuring holes 11 along the engine axial direction to the opposite point of the first measured plane 7; and V is the distance from the plurality of second measuring holes 12 to the second measured plane 8. j, is the distance from the center measuring point of multiple second measuring holes 12 to the opposite point of the second measured plane 8 along the engine axial direction.

[0049] The engine axial distance measurement method of this embodiment directly calculates the distance between the first measured plane 7 and the second measured plane 8 instead of the average distance of multiple measurement points. It uses the first reference plane 6 as a precision plane as a unified reference for measurement. It uses the first measuring hole 11 and the second measuring hole 12 on the first reference plane 6 to obtain the corresponding distance and angle positions. It uses the distance and angle positions obtained through the first measuring hole 11 to construct a second reference plane. It constructs a three-dimensional coordinate system based on the second reference plane. It transforms the distance from the first reference plane 6 to the second measured plane 8 into the three-dimensional coordinate system and constructs a third reference plane. It uses the coordinates of the intersection point of the third reference plane and the third direction to determine the axial distance between the first measured plane 7 and the second measured plane 8.

[0050] This embodiment of the engine axial distance measurement method directly calculates the distance between the first measured plane 7 and the second measured plane 8 instead of averaging the distances of multiple measurement points. The axial distance between the first measured plane 7 and the second measured plane 8 is determined using the coordinates of the intersection of the third reference plane and the third direction, avoiding errors caused by multiple measurement points in related technologies. Using the same precision plane, i.e., the first reference plane 6, as the measurement reference avoids errors caused by selecting multiple different references during the measurement process. Constructing a reference plane using the distance and angle positions obtained from the first measuring hole 11 and the second measuring hole 12 on the first reference plane 6 reduces errors caused by the roughness of the measured plane and eliminates parallelism errors during the measurement process. Constructing a three-dimensional coordinate system based on the second reference plane, and transforming the distance from the first reference plane 6 to the second measured plane 8 into the three-dimensional coordinate system to construct the third reference plane, eliminates errors caused by the parallelism difference between the first measured plane 7 and the second measured plane 8. This measurement method significantly reduces errors and substantially improves the measurement and control accuracy of the engine axial distance.

[0051] In some embodiments, using distance U i and angular position α i Constructing the second reference plane includes:

[0052] For distance U i and angular position α i The fitted plane equation of the second reference plane is obtained by fitting the data using the least squares method, which represents the second reference plane.

[0053] In some embodiments, using distance W j and angular position β j Constructing the third reference plane includes:

[0054] For distance W j and angular position β j The fitted plane equation of the third reference plane is obtained by fitting the data using the least squares method, which represents the third reference plane.

[0055] For example, in some embodiments, the second reference plane can be represented by equation (1).

[0056]

[0057] a, b, c — parameters of the plane equation;

[0058] P i —The distance from the center measuring point of the i-th first measuring hole 11 to the central axis of the engine;

[0059] U i —The distance from the center measuring point of the i-th first measuring hole 11 to the first plane to be measured 7;

[0060] α i —The angular position of the center measuring point of the i-th first measuring hole 11;

[0061] n — the number of the first measuring holes 11.

[0062] For example, in some embodiments, the third reference plane can be represented by equation (2).

[0063]

[0064] u, v, w — parameters of the plane equation;

[0065] Q j —The distance from the center measuring point of the j-th second measuring hole 12 to the central axis of the engine;

[0066] W j —The distance between the j-th measuring point on the second plane to be measured (8) and the second reference plane;

[0067] α j —The angular position of the center measuring point of the j-th second measuring hole 12;

[0068] m — the number of second measuring holes 12.

[0069] This embodiment uses the least squares method to fit data to obtain fitting equations for the second and third reference planes. It can construct plane equations from parameters obtained through discrete measurement points to characterize the entire measured plane, thus improving the accuracy of axial distance measurement. Furthermore, it can also measure distance V... j The distance W between each measurement point on the second measured plane 8 and the second reference plane is obtained by transforming to a three-dimensional coordinate system.j and utilize distance W j and angular position β j Fitting a third reference plane can reduce the impact of the parallelism error between the second and third measured planes on the measurement results.

[0070] In some embodiments, the distance V from the first reference plane 6 to the second test plane 8 is... j Transformation to a three-dimensional coordinate system includes:

[0071] The distance V from the first reference plane 6 to the second test plane 8 is transformed using a transformation matrix. j When transformed into a three-dimensional coordinate system, the transformation matrix is ​​related to θ1 and θ2, where θ is the angle between the first reference plane 6 and the second reference plane, θ1 is the projection angle of the angle θ in the plane perpendicular to the first direction, and θ2 is the projection angle of the angle θ in the plane perpendicular to the second direction.

[0072] For example, in some embodiments, the transformation matrix can be represented by formula (3).

[0073]

[0074] θ — the angle between the first reference plane 6 and the second reference plane;

[0075] θ1 — The projection angle of the included angle θ onto the plane perpendicular to the first direction;

[0076] θ2 — The projection angle of the included angle θ onto the plane perpendicular to the second direction.

[0077] This embodiment uses a transformation matrix to transform the distance V from the first reference plane 6 to the second plane to be measured 8. j By transforming to a three-dimensional coordinate system and using the angle between the first reference plane 6 and the second reference plane, the error caused by the difference in parallelism of the plane to be measured can be eliminated.

[0078] In some embodiments, such as Figure 4 As shown, multiple first measuring holes 11 and multiple second measuring holes 12 are respectively distributed along the first pitch circle 13 and the second pitch circle 14. The first pitch circle 13 and the second pitch circle 14 are concentric, and the radius of the first pitch circle 13 is larger than the radius of the second pitch circle 14. For example, the center of the first pitch circle 13 and the second pitch circle 14 may be located on the central axis of the engine.

[0079] In this embodiment, multiple first measuring holes 11 are distributed along the first pitch circle 13, which can be used to calculate the distance P from the multiple first measuring holes 11 to the central axis of the engine in the fitting equation. i Convert to the radius R of the first pitch circle 13 to avoid measuring different distances P. iThe increased complexity or errors introduced by this method further improve the accuracy of the axial distance measurement method. The same technical effect can also be achieved by arranging multiple second measuring holes 12 distributed along the second pitch circle 14.

[0080] In some embodiments, a plurality of first measuring holes 11 may be evenly spaced on a first pitch circle 13, and / or a plurality of second measuring holes 12 may be evenly spaced on a second pitch circle 14. This arrangement can directly calculate the angular positions of the first measuring holes 11 and the second measuring holes 12, thereby avoiding errors caused by measuring the angular positions of the first measuring holes 11 and the second measuring holes 12.

[0081] In some embodiments, a plurality of first measuring holes 11 and a plurality of second measuring holes 12 are arranged in groups, each group including a first measuring hole 11 and a second measuring hole 12 located in the same radial direction.

[0082] In this embodiment, the first measuring hole 11 and the second measuring hole 12 are arranged in groups, and the first measuring hole 11 and the second measuring hole 12 are set in the same radial direction. This arrangement will eliminate the need to measure the angle of each measuring hole, further simplifying the measurement steps and improving the accuracy of the axial distance measurement method.

[0083] In some embodiments, the origin of the three-dimensional coordinate system is located on the central axis of the engine.

[0084] This embodiment sets the origin of the three-dimensional coordinate system on the central axis of the engine, thus ignoring the influence of the distance between the origin of the three-dimensional coordinate system and the central axis of the engine on the fitting equation, making the fitting equation and the entire measurement method simpler.

[0085] In some embodiments, the first reference plane 6 is located outside the first test plane 7 and the second test plane 8.

[0086] In some embodiments, the first reference plane 6 may be located between the first test plane 7 and the second test plane 8, or the first reference plane 6 may be located on the first test plane 7 or the second test plane 8.

[0087] In some embodiments, the first test plane 7 is the rear mounting plane of the fan housing, and the second test plane 8 is the rear mounting plane of the central drive gearbox. In the engine intake direction, the first reference plane 6 is located axially behind the rear mounting plane of the fan housing.

[0088] In this embodiment, such as Figure 2As shown, in the engine intake direction, the first reference plane 6 is located axially behind the fan housing rear mounting plane. The radius of the measurable position of the fan housing rear mounting plane is the first radius, and the radius of the measurable position of the central drive gearbox rear mounting plane is the second radius. The first radius is greater than the second radius. The positions of multiple first measuring holes 11 on the first reference plane 6 correspond axially to the positions of the first radius, and the positions of multiple second measuring holes 12 on the first reference plane 6 correspond axially to the positions of the second radius.

[0089] In some embodiments, after the actual assembly is completed, such as Figure 1 The front end of the engine rotor 1 shown is inserted into, as... Figure 2 In the shown central drive gearbox, the adjusting shim 3 is located between the compressor rotor 1 and the central drive gearbox 5, inside the rear end of the driving bevel gear 9. The central drive gearbox 5 contains a bearing 10. In the above embodiment, the non-parallelism between the first test plane 7 and the second test plane 8 is caused by factors such as bearing clearance and machining errors.

[0090] If the theoretical axial dimension is L, the axial distance is H, the size of the adjusting shim is T, and half of the bearing axial clearance is Δx, then the relationship between them is: L=H+T+Δx.

[0091] In some embodiments, the engine axial distance measurement method further includes:

[0092] During the measurement of the engine axial distance, an axial force is applied to the front end of the drive bevel gear 9 of the central transmission gearbox to eliminate bearing clearance in the central transmission gearbox 5.

[0093] In this embodiment, by applying an axial force to the front end of the driving bevel gear 9 of the central transmission gearbox, the rotating part of the central transmission gearbox can be fixed axially, ensuring the stability of the bearing state during the measurement process.

[0094] In some embodiments, such as Figure 3 As shown in the flowchart, combined with Figure 1 , Figure 2 and Figure 4 Methods for measuring engine axial distance include:

[0095] Step 110: Complete the assembly of the central drive gearbox 5 into the fan housing 4;

[0096] Step 120: Apply an axial force F to the front end of the driving bevel gear 9 of the central transmission gearbox;

[0097] Step 130, Establish the first reference plane 6: After the mounting plane behind the fan casing, establish a plane perpendicular to the axial direction, such as... Figure 4 The first reference plane 6 shown has its pitch circle center located on the central axis of the engine;

[0098] Step 140: Measure distance U i Record its value and angle: Measure the distance U from the first reference plane 6 to the rear mounting plane of the fan casing through each first measuring hole 11. i and its corresponding angular position α i ;

[0099] Step 150: Measure distance V j Record its value and angle: Measure the distance V from the first reference plane 6 to the mounting plane of the central transmission gearbox through each of the second measuring holes 12. j and its corresponding angular position β j ;

[0100] Step 160: Calculate the axial distance: Calculate the axial distance H between the rear mounting plane of the fan casing and the rear mounting plane of the central drive gearbox.

[0101] In this embodiment, steps 120 and 130 are not distinguished by any order, steps 140 and 150 are not distinguished by any order, and the remaining steps are executed in sequence.

[0102] In some embodiments, there are two calculation methods. The first method utilizes distance U. i and its corresponding angular position α i A second reference plane J is constructed, which serves as the XY coordinate system. The intersection of the engine's central axis and the second reference plane J is taken as the origin O. Any first measuring hole 11 is selected. The line connecting the projection of the center measuring point of this first measuring hole 11 onto the second reference plane along the engine axis direction and the origin is designated as the first direction, marked as the X-axis. A second direction on the second reference plane is perpendicular to the first direction and is marked as the Y-axis. A third direction aligns with the engine axis and is marked as the Z-axis, thus constructing the OXYZ coordinate system. The distance V is... j Transform to the OXYZ coordinate system to obtain the distance W between each measurement point and the reference plane J. j and utilize distance W j and angular position β j Construct a third reference plane K, and the coordinates of the intersection point of the third reference plane K and the third direction (Z-axis) are the axial distance H;

[0103] The second method: using distance V j and its corresponding angular position β jA second reference plane J is constructed, which serves as the XY coordinate system. The intersection of the engine's central axis and the second reference plane J is taken as the origin O. Any second measuring hole 12 is selected. The line connecting the projection of the center measuring point of this second measuring hole 12 onto the second reference plane along the engine axis direction and the origin is designated as the first direction, marked as the X-axis. A second direction perpendicular to the first direction is also designated as the Y-axis on the second reference plane. A third direction aligned with the engine axis is designated as the Z-axis, thus constructing the OXYZ coordinate system. The distance U is... i Transform to the OXYZ coordinate system to obtain the distance W between each measurement point and the reference plane J. i and utilize distance W i and angular position α i Construct a third reference plane K, and the coordinates of the intersection point of the third reference plane K and the third direction (Z-axis) are the axial distance H.

[0104] In some embodiments, the number of the first measuring hole 11 and the second measuring hole 12 are both n. The first method can be described as follows: firstly, the second reference plane J is fitted using the least squares method.

[0105]

[0106] a, b, c — parameters of the plane equation;

[0107] R—the radius of the first pitch circle 13;

[0108] U i — The distance from the center measuring point of the i-th first measuring hole 11 to the rear mounting plane of the fan casing;

[0109] α i —The angular position of the center measuring point of the i-th first measuring hole 11;

[0110] n — the number of the first measuring holes 11.

[0111] After constructing the OXYZ coordinate system, the distance V i Transform to the OXYZ coordinate system to obtain the distance W between each measurement point and the second reference plane J. i The transformation matrix is:

[0112]

[0113] θ — the angle between the first reference plane 6 and the second reference plane J;

[0114] θ x —The projection angle of the included angle θ onto the YZ plane;

[0115] θ y—The projection angle of the included angle θ onto the XZ plane.

[0116] Distance V j Multiplying by the transformation matrix T yields the distance W. j ,

[0117] W j =V j ·T (6)

[0118] Then, the third reference plane K is fitted using the least squares method.

[0119]

[0120] In the formula, u, v, and w are parameters of the plane equation.

[0121] u, v, w — parameters of the plane equation;

[0122] r—the radius of the second pitch circle 14;

[0123] W j — The distance between the measuring point on the mounting plane of the j-th central transmission gearbox and the second reference plane J;

[0124] β j —The angular position of the center measuring point of the second measuring hole 12 of the j-th hole;

[0125] n — the number of second measuring holes 12.

[0126] H is the coordinate of the intersection point of the reference plane K and the Z-axis of the coordinate system.

[0127] Secondly, based on the axial distance measured by the engine axial distance measurement method in the above embodiments, this disclosure provides an engine axial distance control method, including:

[0128] The size of the adjusting shim is calculated based on the axial distance. The adjusting shim 3 is located between the compressor rotor 1 and the central transmission gearbox 5. The size of the adjusting shim = axial distance - half of the bearing axial clearance - theoretical axial size.

[0129] Adjustment shim 3 is set according to the size of the adjustment shim to control the axial distance of the engine.

[0130] In some embodiments, such as Figure 3 As shown in the flowchart, combined with Figure 1 , Figure 2 and Figure 4 Engine axial distance control methods include:

[0131] Perform steps 110-160 to measure the axial distance H;

[0132] Step 170: Calculate the adjusting shim size and adjust the adjusting shim accordingly: The required adjusting shim size T can be calculated based on the axial distance H.

[0133] T=H-Δx-L (8)

[0134] L—theoretical axial dimension

[0135] △x — half of the bearing's axial clearance.

[0136] The corresponding adjustment shim size is T, thereby achieving precise control of the engine axial distance.

[0137] This embodiment calculates the adjustment shim size by accurately measuring the engine axial distance, and then achieves precise control of the engine axial distance by adjusting the adjustment shim size.

[0138] Furthermore, this disclosure also provides an engine axial distance measuring device for implementing the engine axial distance measuring method in the above embodiments. The axial distance measuring device includes a plate, with any side of the plate along its own thickness direction serving as a first reference plane 6, and the plate is provided with a plurality of first measuring holes 11 and a plurality of second measuring holes 12.

[0139] The axial distance measuring device in this embodiment can be used to provide a first reference plane 6 to obtain a unified reference for measurement, and can also be used to provide a first measuring hole 11 and a second measuring hole 12 to obtain the distance and angular position of the reference plane, thereby reducing measurement error and avoiding errors caused by parallelism differences, and realizing accurate measurement and precise control of engine axial distance.

[0140] In some embodiments, a plurality of first measuring holes 11 and a plurality of second measuring holes 12 are distributed along a first indexing circle 13 and a second indexing circle 14, respectively. The first indexing circle 13 and the second indexing circle 14 are concentric, and the radius of the first indexing circle 13 is greater than that of the second indexing circle 14.

[0141] like Figure 4 As shown, in this embodiment, the plate is arranged with multiple first measuring holes 11 distributed along the first pitch circle 13, which can measure the distance P from the multiple first measuring holes 11 to the central axis of the engine in the fitting equation. i Convert to the radius R of the first pitch circle 13 to avoid measuring different distances P. i The increased complexity or errors introduced by this method further improve the accuracy of the axial distance measurement method. The same technical effect can also be achieved by arranging multiple second measuring holes 12 distributed along the second pitch circle 14.

[0142] In some embodiments, a plurality of first measuring holes 11 may be evenly spaced on a first pitch circle 13, and / or a plurality of second measuring holes 12 may be evenly spaced on a second pitch circle 14. This arrangement can directly calculate the angular positions of the first measuring holes 11 and the second measuring holes 12, thereby avoiding errors caused by measuring the angular positions of the first measuring holes 11 and the second measuring holes 12.

[0143] In some embodiments, a plurality of first measuring holes 11 and a plurality of second measuring holes 12 are arranged in groups, each group including a first measuring hole 11 and a second measuring hole 12 located in the same radial direction.

[0144] In this embodiment, the first measuring hole 11 and the second measuring hole 12 are arranged in groups, and the first measuring hole 11 and the second measuring hole 12 are set in the same radial direction. This arrangement allows the angle between the first measuring hole 11 and the second measuring hole 12 to be calculated directly without the need for additional measurement of the angle of the measuring holes, further simplifying the measurement steps and improving the accuracy of the axial distance measurement method.

[0145] The foregoing has provided a detailed description of an engine axial distance measurement method, control method, and measuring device. Specific embodiments have been used to illustrate the principles and implementation methods of this disclosure. These embodiments are merely illustrative and are intended to aid in understanding the method and its core concepts. It should be noted that those skilled in the art can make various improvements and modifications to this disclosure without departing from its principles, and these improvements and modifications also fall within the scope of protection of the claims of this disclosure.

Claims

1. A method for measuring the axial distance of an engine, comprising: A first reference plane (6) perpendicular to the engine axis is established, and a plurality of first measuring holes (11) and a plurality of second measuring holes (12) are provided on the first reference plane (6). The distance U from the first reference plane (6) to the first plane to be measured (7) is measured through multiple first measuring holes (11). i And obtain the angular positions α of multiple first measuring holes (11). i , i =1,2,3…m; The distance V from the first reference plane (6) to the second plane to be measured (8) is measured through multiple second measuring holes (12). j And obtain the angular positions β of multiple second measuring holes (12). j , j =1,2,3…n; a plurality of first measuring holes (11) and a plurality of second measuring holes (12) are respectively distributed along the first indexing circle (13) and the second indexing circle (14), the first indexing circle (13) and the second indexing circle (14) are concentric, and the radius of the first indexing circle (13) is greater than the radius of the second indexing circle (14); Using distance U i and angular position α i Construct a second reference plane, and establish a three-dimensional coordinate system with a third direction consistent with the axis and a first and second direction perpendicular to each other in the second reference plane; Distance V j Transform to the three-dimensional coordinate system to obtain the distance W between each measurement point on the second measured plane (8) and the second reference plane. j and utilize distance W j and angular position β j Construct a third reference plane, and determine the axial distance between the first test plane (7) and the second test plane (8) based on the coordinates of the intersection point of the third reference plane and the third direction.

2. The engine axial distance measurement method according to claim 1, characterized in that, The utilization distance U i and angular position α i Constructing the second reference plane includes: For distance U i and angular position α i The fitted plane equation of the second reference plane is obtained by fitting the data using the least squares method, to represent the second reference plane; and / or The utilization distance W j and angular position β j Constructing the third reference plane includes: For distance W j and angular position β j The fitted plane equation of the third reference plane is obtained by fitting the data using the least squares method, so as to represent the third reference plane.

3. The engine axial distance measurement method according to claim 1, characterized in that, The distance V from the first reference plane (6) to the second plane to be measured (8) j Transforming to the three-dimensional coordinate system includes: The distance V from the first reference plane (6) to the second test plane (8) is transformed using a transformation matrix. j Transformation into the three-dimensional coordinate system, the transformation matrix and and Related, among which It is the angle between the first reference plane (6) and the second reference plane. It is the included angle The projection angle in the plane perpendicular to the first direction. It is the included angle The projection angle in a plane perpendicular to the second direction.

4. The engine axial distance measurement method according to claim 1, characterized in that, Multiple first measuring holes (11) and multiple second measuring holes (12) are grouped together, and each group includes the first measuring hole (11) and the second measuring hole (12) located in the same radial direction.

5. The method for measuring engine axial distance according to any one of claims 1 to 3, characterized in that, The origin of the three-dimensional coordinate system is located on the central axis of the engine.

6. The method for measuring engine axial distance according to any one of claims 1 to 3, characterized in that, The first reference plane (6) is located outside the first test plane (7) and the second test plane (8) along the axial direction.

7. The engine axial distance measurement method according to claim 6, characterized in that, The first test plane (7) is the rear mounting plane of the fan housing, and the second test plane (8) is the rear mounting plane of the central transmission gearbox. In the engine intake direction, the first reference plane (6) is located behind the rear mounting plane of the fan housing along the axial direction.

8. The engine axial distance measurement method according to claim 7, characterized in that, Also includes: During the measurement of the engine axial distance, an axial force is applied to the front end of the drive bevel gear (9) of the central transmission gearbox to eliminate bearing clearance in the central transmission gearbox (5).

9. A method for controlling the axial distance of an engine, characterized in that, include: The axial distance is measured by the axial distance measurement method according to any one of claims 1 to 8; The size of the adjusting shim is calculated based on the axial distance. The adjusting shim (3) is located between the compressor rotor (1) and the central transmission gearbox (5). The size of the adjusting shim = the axial distance - half of the bearing axial clearance - theoretical axial size. The adjustment shim (3) is set according to the size of the adjustment shim to control the axial distance of the engine.

10. An engine axial distance measuring device, characterized in that, For implementing the axial distance measurement method as described in any one of claims 1 to 8, the axial distance measuring device includes a plate, any side of the plate along its own thickness direction serves as the first reference plane (6), and the plate is provided with a plurality of first measuring holes (11) and a plurality of second measuring holes (12).

11. The engine axial distance measuring device according to claim 10, characterized in that, Multiple first measuring holes (11) and multiple second measuring holes (12) are grouped together, and each group includes the first measuring hole (11) and the second measuring hole (12) located in the same radial direction.

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