Accessory transmission casing and detection device and detection method thereof

Abstract

The invention discloses an accessory transmission casing and a detection device and method thereof, and belongs to the technical field of aero-engine parts, the accessory transmission casing comprises a transmission frame, a transmission gear assembly and a connecting shaft, the transmission gear assembly comprises a first driving bevel gear, a first driven bevel gear and a second driving bevel gear, the first driving bevel gear is arranged in a transmission shaft hole of the transmission frame, and the first driven bevel gear is used for being meshed with the first driving bevel gear. A second mounting hole coaxial with the first mounting hole is formed in the outer ring of the accessory transmission casing, the second driving bevel gear is mounted in the second mounting hole, and the connecting shaft is used for connecting the first driven bevel gear with the second driving bevel gear. The second driving bevel gear is used for being externally connected with a driven component and meshed with a second driven bevel gear preset on the driven component. A transmission frame is arranged in an accessory transmission casing to fix and support a pair of bevel gear pairs, so that the direction of a transmission route is changed through the bevel gear pairs.

Description

Technical Field

[0001] The present application relates to the technical field of aero-engine components, and in particular, to an accessory drive casing. In addition, the present application also relates to an accessory drive casing detection device for detecting the above-mentioned accessory drive casing, and further, the present application also relates to a detection method using the above-mentioned accessory drive casing detection device. Background Art

[0002] The information provided in this part is for the purpose of generally presenting the background of the present application. To the extent described in this part, the work of the currently named inventors and aspects that may not constitute prior art descriptions at the time of filing are neither expressly nor implicitly considered prior art to the present application.

[0003] In the field of aero-engine technology, an accessory drive of a turboprop engine is located between a speed reducer and a compressor, and is used to mount engine accessories and aircraft accessories driven by the engine. The casing of the accessory drive is called an accessory drive casing. The accessory drive needs to arrange a transmission chain inside, and it involves how to reasonably arrange spiral bevel gear pairs (for example, how to arrange two pairs of bevel gear pairs with a certain shaft intersection angle β) to change the direction of the transmission route and achieve specific functions.

[0004] Spiral bevel gears have the advantages of high transmission efficiency, reliable operation, and the ability to change the direction of power transmission, etc., but their installation requirements are relatively high. Therefore, after adopting spiral bevel gear pairs, it is necessary to consider how to effectively fix the spiral bevel gears and their bearings, and it also involves how to verify whether the bevel gears are installed qualified, so as to avoid repeated adjustments during the assembly of the accessory drive casing. If the inspection tooling is not suitable and the calculation method is improper, it is easy to consume a large amount of assembly time.

[0005] It should be noted that the information disclosed in the above background art part is only used to strengthen the understanding of the background of the present application, and therefore may include information that does not constitute prior art known to those of ordinary skill in the art. Summary of the Invention

[0006] In view of at least one of the above technical problems, the present application provides an accessory drive casing, which can fixedly support a pair of bevel gear pairs by arranging a transmission rack in the accessory drive casing to change the direction of the transmission route through the bevel gear pairs.

[0007] At the same time, the present application also provides an accessory drive casing detection device for detecting the above-mentioned accessory drive casing, which verifies whether the bevel gears are installed qualified by checking the installation of the transmission rack, and the detection process is very efficient, avoiding affecting the overall assembly time.

[0008] At the same time, the present application also provides a detection method using the above-mentioned accessory drive casing detection device.

[0009] According to one aspect of the present application, an accessory drive casing is provided, which includes a casing body, a drive bracket, a drive gear assembly, and a connecting shaft. The drive bracket is fixedly installed inside the accessory drive casing. The drive gear assembly includes a first driving bevel gear, a first driven bevel gear, and a second driving bevel gear. The first driving bevel gear is installed in the transmission shaft hole of the drive bracket. The drive bracket is provided with an inclined installation part beside the transmission shaft hole. A first installation hole is opened on the inclined installation part for installing the first driven bevel gear, and the first driven bevel gear is used to mesh with the first driving bevel gear;

[0010] A second installation hole coaxial with the first installation hole is opened on the outer casing of the accessory drive casing. The second driving bevel gear is installed in the second installation hole. The connecting shaft is used to connect the first driven bevel gear and the second driving bevel gear. The second driving bevel gear is used to externally connect a driven component and mesh with a second driven bevel gear preset on the driven component.

[0011] According to another aspect of the present application, an accessory drive casing detection device is also provided for detecting the above-mentioned accessory drive casing. The accessory drive casing detection device includes a coaxiality measurement mechanism for measuring the coaxiality between the first installation hole and the second installation hole, and an adjusting pad. The adjusting pad is used to be padded on the joint surface between the drive bracket and the accessory drive casing, and the adjusting pad is used to adjust the position of the drive bracket, thereby adjusting the coaxiality between the first installation hole and the second installation hole; the coaxiality measurement mechanism includes a positioning disc, a rotating shaft, and a dial indicator bracket. A support member is provided on the positioning disc. The first end of the rotating shaft is used to sequentially pass through the support member and a preset through hole on the positioning disc. The second end of the rotating shaft is connected to the dial indicator bracket. The dial indicator bracket is used to install a dial indicator. The positioning disc is used to be installed in the second installation hole. The rotating shaft is used to drive the dial indicator bracket and the dial indicator to rotate to measure the runout values at different positions of the first installation hole.

[0012] In some embodiments of the present application, a limit retaining ring is provided in the middle of the rotating shaft. The limit retaining ring is used to abut against the top of the support member after the first end of the rotating shaft sequentially passes through the support member and the positioning disc, so as to support and position the rotating shaft.

[0013] In some embodiments of the present application, the accessory drive casing detection device further includes a locking member. The locking member is sleeved on the first end of the rotating shaft and is threadedly connected to the rotating shaft. The locking member is used to abut against the side of the positioning disc away from the support member to cooperate with the limit retaining ring to limit the rotating shaft axially along the support member.

[0014] In some embodiments of the present application, a limit platform is provided on the side of the positioning disc away from the support member. The limit platform is used to abut against the side wall of the outer casing of the casing when the positioning disc is installed in the second installation hole, so as to position the positioning disc.

[0015] In some embodiments of the present application, the accessory drive gearbox detection device further includes a rotating handle, and the first end of the rotating shaft sequentially passes through the support member and the positioning disc and then is connected to the rotating handle.

[0016] In addition, the present application also discloses a detection method for an accessory drive gearbox detection device. Using the above-mentioned accessory drive gearbox detection device, the detection method includes the following steps:

[0017] S100. Select an adjusting pad and record its original size S0;

[0018] S200. Install the adjusting pad on the joint surface between the transmission frame and the accessory drive gearbox, install the positioning disc into the second mounting hole, and install a dial indicator through the dial indicator support to measure the first mounting hole;

[0019] S300. Press the head of the dial indicator against the hole wall of the first mounting hole. First, zero the dial indicator, and then rotate the rotating shaft to measure the runout values of two opposite points on the first mounting hole through the dial indicator, and calculate the difference △ between the two runout values;

[0020] S400. If the difference △ is less than or equal to the preset value, it means that the coaxiality of the first mounting hole and the second mounting hole meets the installation requirements; if the difference △ is greater than the preset value, it means that the coaxiality deviation between the first mounting hole and the second mounting hole is large, affecting the installation accuracy of the transmission gear assembly, then grind the adjusting pad to reduce its thickness;

[0021] S500. Reassemble the ground adjusting pad, and then repeat steps S300 - S400 until the difference △ is not greater than the preset value, then the relative position of the first mounting hole and the second mounting hole meets the installation requirements of the transmission gear assembly.

[0022] In some embodiments of the present application, in step S300, press the head of the dial indicator against the hole wall of the first mounting hole, select four points A, B, C, and D evenly distributed in a circular array on the hole wall of the first mounting hole. First, align with point B, zero the dial indicator through point B, and then rotate the rotating shaft to align the dial indicator with point D to measure the runout value and direction, and obtain the runout value △4 of point D. If |△4| > the preset value, replace the matching new transmission frame until |△4| ≤ the preset value, which is regarded as the new transmission frame meeting the assembly accuracy requirements.

[0023] In some embodiments of the present application, if |△4| ≤ the preset value, continue to measure the runout values and directions of points A and C respectively, record the runout values of the two points as △1 and △3 respectively, and calculate the difference △ = △1 - △3 between the two.

[0024] In some embodiments of the present application, in step S400, the final thickness S of the adjusting pad after grinding is calculated by the following formula:

[0025] S = S0 - △÷2×cosα (1)

[0026] In the formula, S0 is the initial thickness of the adjusting pad without grinding, and α is the shaft intersection angle β between the second driving bevel gear and the first driving bevel gear minus 90°, that is, α = β - 90°.

[0027] The present application has the following beneficial effects:

[0028] In the present application, an accessory drive gearbox realizes the arrangement of a drive chain with a variable drive route direction in the accessory drive gearbox through a drive frame and a gear drive assembly, so as to smoothly drive a driven component arranged in a dislocation manner with the accessory drive gearbox. The drive gear assembly includes a first driving bevel gear, a first driven bevel gear and a second driving bevel gear. The first driving bevel gear is installed in the drive shaft hole of the drive frame and can be driven to rotate by the drive main shaft in the drive shaft hole. The first driven bevel gear is installed in the first mounting hole on the inclined mounting part of the drive frame. The first driven bevel gear is used to mesh with the first driving bevel gear to realize the change of the first drive route direction. The second driving bevel gear is installed in the second mounting hole on the outer ring of the gearbox of the accessory drive gearbox, and the first driven bevel gear is connected to the second driving bevel gear through a connecting shaft. Finally, the second driving bevel gear meshes with the second driven bevel gear on the externally connected driven component to realize the second direction change of the drive route and smoothly drive the driven component.

[0029] The accessory drive gearbox detection device of the present application can efficiently measure the coaxiality of the first mounting hole and the second mounting hole of the accessory drive gearbox, and then verify whether the installation of each bevel gear of the gear drive assembly is qualified through the coaxiality of the two. The overall positioning of the measuring device is realized by installing the positioning disc into the second mounting hole. The dial indicator can be conveniently driven to rotate through the rotating shaft to realize the measurement of the runout of the first mounting hole. The overall measurement is very convenient and fast, which is convenient for shortening the measurement time and improving the overall assembly and detection efficiency.

[0030] The detection method of the accessory drive casing of the present application adopts the above-mentioned accessory drive casing detection device. The position of the drive bracket is adjusted by the adjusting pad, and the thickness of the adjusting pad is ground to finely adjust the drive bracket, so that the coaxiality error between the first mounting hole and the second mounting hole is not too large, thereby ensuring that the installation of the bevel gear pair meets the requirements. Since the bevel gear pair needs to satisfy that the pitch line intersection point of the driving bevel gear coincides with the pitch line intersection point of the driven bevel gear at point P during normal operation, and the pitch line intersection point of the bevel gear is a virtual point and cannot be found during the assembly process. To verify whether the bevel gear is installed qualified, it is necessary to judge by checking the meshing backlash and tooth surface coloring of the bevel gear pair. And the present application can ensure the high precision of the overall assembly dimension chain by ensuring that the coaxiality between the first mounting hole on the drive bracket and the second mounting hole on the outer ring of the casing is within a high-precision range. By strictly controlling the high-weight error value with the greatest influence, the installation of the bevel gear is ensured within the allowable error range. Therefore, the present application solves the problem of difficult measurement of the pitch line intersection point of the bevel gear by converting the measurement method. Considering the overall transmission dimension chain and converting the measurement direction, it can realize the efficient detection of the key components of the accessory drive casing, avoid repeated assembly, and effectively improve the efficiency and precision of the assembly.

[0031] Of course, it is not necessary for any product implementing the present application to achieve all the above-mentioned advantages simultaneously. In addition to the purposes, features and advantages described above, the present application has other purposes, features and advantages. The following will refer to the drawings for a further detailed description of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The schematic embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation to the present application. In the drawings:

[0033] Figure 1 is a schematic diagram of the overall structure of the accessory drive casing of the preferred embodiment of the present application;

[0034] Figure 2 is a schematic diagram of the structure of the measuring device of the preferred embodiment of the present application;

[0035] Figure 3 is a schematic diagram of the position of the measuring point in the first mounting hole of the preferred embodiment of the present application;

[0036] Legend: 100, accessory drive casing; 101, drive bracket; 1011, drive shaft hole; 1012, inclined mounting part; 1013, first mounting hole; 102, first driving bevel gear; 103, first driven bevel gear; 104, first bearing; 105, second bearing; 106, outer casing of the casing; 1061, second mounting hole; 107, second driving bevel gear; 108, third bearing; 109, connecting shaft; 110, adjusting pad; 200, driven component; 201, second driven bevel gear; 300, coaxiality measuring mechanism; 301, positioning disc; 3011, support member; 3012, limiting platform; 302, rotating shaft; 3021, limiting retaining ring; 303, dial indicator bracket; 304, rotating handle; 305, locking member. Detailed implementation mode

[0037] The embodiments of the present application will be described in detail below with reference to the accompanying drawings. However, the present application can be implemented in many different ways defined and covered by the following.

[0038] An accessory drive casing includes a casing main body 100, a drive bracket 101, a drive gear assembly, and a connecting shaft 109. The drive bracket 101 is fixedly installed in the casing main body 100. The drive gear assembly includes a first driving bevel gear 102, a first driven bevel gear 103, and a second driving bevel gear 107. The first driving bevel gear 102 is installed in the drive shaft hole 1011 of the drive bracket 101. The drive bracket 101 is provided with an inclined mounting part 1012 beside the drive shaft hole 1011. A first mounting hole 1013 is opened on the inclined mounting part 1012. The first mounting hole 1013 is used to install the first driven bevel gear 103, and the first driven bevel gear 103 is used to mesh with the first driving bevel gear 102.

[0039] A second mounting hole 1061 coaxial with the first mounting hole 1013 is opened on the outer casing 106 of the casing main body 100. The second driving bevel gear 107 is installed in the second mounting hole 1061. The connecting shaft 109 is used to connect the first driven bevel gear 103 and the second driving bevel gear 107. The second driving bevel gear 107 is used to externally connect a driven component 200 and mesh with a second driven bevel gear 201 preset on the driven component 200.

[0040] Here, the "first driving bevel gear 102 and the first driven bevel gear 103" are a pair of bevel gear pairs, which can realize the change of the direction of the first transmission route. The first driving bevel gear 102 is installed in the drive shaft hole 1011 through a first bearing 104, and the first driving bevel gear 102 can be driven to rotate by the drive main shaft in the drive shaft hole 1011. The first driven bevel gear 201 is installed in the first mounting hole 1013 through a second bearing 105.

[0041] Meanwhile, the second driving bevel gear 107 is installed in the second mounting hole 1061 through the third bearing 108. The second driving bevel gear 107 is connected to the first driven bevel gear 103 through the connecting shaft 109, so as to drive the second driving bevel gear 107 to rotate through the first driven bevel gear 103. The second driving bevel gear 107 meshes with the second driven bevel gear 201, so as to change the direction of the second transmission route.

[0042] The meaning of the "connecting shaft 109" here refers to the structure of the transmission shaft connecting the first driven bevel gear 103 and the second driving bevel gear 107. In some embodiments, the connecting shaft 109 is a hollow shaft structure.

[0043] In this application, a transmission chain with a changeable transmission route direction is arranged in the casing main body 100 through the transmission frame 101 and the gear transmission assembly, so as to smoothly drive the driven component 200 arranged in a dislocation manner with the casing main body 100. The transmission gear assembly includes a first driving bevel gear 102, a first driven bevel gear 103 and a second driving bevel gear 107. The first driving bevel gear 102 is installed in the transmission shaft hole 1011 of the transmission frame 101, and can be driven to rotate by the transmission main shaft in the transmission shaft hole 1011. The first driven bevel gear 103 is installed in the first mounting hole 1013 on the inclined mounting part 1012 of the transmission frame 101. The first driven bevel gear 103 is used to mesh with the first driving bevel gear 102 to change the direction of the first transmission route. The second driving bevel gear 107 is installed in the second mounting hole 1061 on the outer casing 106 of the casing main body 100, and the first driven bevel gear 103 is connected to the second driving bevel gear 107 through the connecting shaft 109. Finally, the second driving bevel gear 107 meshes with the second driven bevel gear 201 on the externally connected driven component 200 to change the direction of the transmission route for the second time, and smoothly drive the driven component 200.

[0044] According to another aspect of the present application, there is also provided an accessory drive casing detection device for detecting the above-mentioned accessory drive casing. The accessory drive casing detection device includes a coaxiality measurement mechanism 300 for measuring the coaxiality between the first mounting hole 1013 and the second mounting hole 1061, and an adjusting pad 110. The adjusting pad 110 is used to be padded on the joint surface between the transmission frame 101 and the casing body 100. The adjusting pad 110 is used to adjust the position of the transmission frame 101, and further adjust the coaxiality between the first mounting hole 1013 and the second mounting hole 1061. The coaxiality measurement mechanism 300 includes a positioning disk 301, a rotating shaft 302, and a dial indicator bracket 303. A support member 3011 is provided on the positioning disk 301. The first end of the rotating shaft 302 is used to sequentially pass through the support member 3011 and a preset through hole on the positioning disk 301. The second end of the rotating shaft 302 is connected to the dial indicator bracket 303. The dial indicator bracket 303 is used to install a dial indicator. The positioning disk 301 is used to be installed into the second mounting hole 1061. The rotating shaft 302 is used to drive the dial indicator bracket 303 and the dial indicator to rotate to measure the runout values at different positions of the first mounting hole 1013.

[0045] Here, the meaning of the "dial indicator bracket 303" is a bracket for installing a dial indicator, which is prior art and will not be elaborated here. The dial indicator bracket 303 can be fixedly installed at the second end of the rotating shaft 302 through bolts or screws, etc., and can drive the dial indicator barrel rotating shaft 302 to rotate synchronously.

[0046] Here, the meaning of the "support member 3011" is a structure vertically provided on the positioning disk 301 that plays a role in limiting and guiding the rotating shaft 302. In some embodiments, the support member 3011 is a hollow rod structure for the rotating shaft 302 to pass through.

[0047] The accessory drive casing detection device of the present application can efficiently measure the coaxiality between the first mounting hole 1013 and the second mounting hole 1061 of the casing body 100, and then verify whether the installation of each bevel gear of the gear transmission assembly is qualified through the coaxiality of the two. The overall positioning of the measuring device is achieved by installing the positioning disk 301 into the second mounting hole 1061. The rotating shaft 302 facilitates driving the dial indicator to rotate to measure the runout of the first mounting hole 1013. The overall measurement is very convenient and fast, which is convenient for shortening the measurement time and improving the overall assembly and detection efficiency.

[0048] Preferably, please refer to Figure 2 As shown, a limit retaining ring 3021 is provided in the middle of the rotating shaft 302. The limit retaining ring 3021 is used to abut against the top of the support member 3011 after the first end of the rotating shaft 302 sequentially passes through the support member 3011 and the positioning disk 301 to support and position the rotating shaft 302.

[0049] It can be understood that after the first end of the rotating shaft 302 passes through the support member 3011 and the positioning disc 301 in sequence, in order to limit and support the rotating shaft 302, by providing a limiting retaining ring 3021 around the middle of the rotating shaft 302, the top of the support member 3011 can be abutted against by the limiting retaining ring 3021, which can play a role in supporting and limiting the rotating shaft 302.

[0050] In this preferred embodiment, the accessory transmission case detection device further includes a locking member 305. The locking member 305 is sleeved on the first end of the rotating shaft 302 and is threadedly connected to the rotating shaft 302. The locking member 305 is used to abut against the side of the positioning disc 301 away from the support member 3011 to cooperate with the limiting retaining ring 3021 to limit the rotating shaft 302 axially along the support member 3011.

[0051] It can be understood that the position of the locking member 305 on the rotating shaft 302 can be adjusted, so as to conveniently cooperate with the limiting retaining ring 3021 at the other end to enable the rotating shaft 302 to be rotatably passed through the support member 3011 and the positioning disc 301, but the axial direction of the rotating shaft 302 is limited to ensure the stability during the measurement with the dial indicator.

[0052] Optionally, the limiting retaining ring 3021 is threadedly connected to the rotating shaft 302. By adjusting the position of the limiting retaining ring 3021 and cooperating with the locking member 305, the length of the second end of the rotating shaft 302 extending outside the support member 3011 can be adjusted, and thus the position of the dial indicator can be adjusted.

[0053] Preferably, please refer to Figure 2 As shown, a limiting platform 3012 is provided on the side of the positioning disc 301 away from the support member 3011. The limiting platform 3012 is used to abut against the side wall of the outer casing 106 of the casing when the positioning disc 301 is installed in the second mounting hole 1061 to limit the positioning disc 301.

[0054] It can be understood that the outer diameter of the positioning disc 301 is smaller than the diameter of the second mounting hole 1061, but the outer diameter of the limiting platform 3012 is larger than the diameter of the second mounting hole 1061. Therefore, after the positioning disc 301 is inserted into the second mounting hole 1061, the limiting platform 3012 can abut against the side wall of the outer casing 106 of the casing to realize the limitation of the positioning disc 301 and ensure the stability of the measuring device during measurement.

[0055] Preferably, please refer to Figure 2 As shown, the accessory transmission case detection device further includes a rotating handle 304. The first end of the rotating shaft 302 passes through the support member 3011 and the positioning disc 301 in sequence and is connected to the rotating handle 304.

[0056] It can be understood that the rotating shaft 302 can be conveniently driven to rotate by the rotating handle 304, so as to adjust the direction of the dial indicator and realize measurements in different directions.

[0057] Optionally, the rotating handle 304 is mounted on the first end of the rotating shaft 302 through bolts or screws, which facilitates the removal of the rotating handle 304 for the disassembly and assembly of the rotating shaft 302.

[0058] In addition, the present application also discloses a detection method for an accessory drive gearbox detection device. Using the above-mentioned accessory drive gearbox detection device, the detection method includes the following steps:

[0059] S100. Select an adjusting pad 110 and record its original size S0;

[0060] S200. Install the adjusting pad 110 on the joint surface between the transmission frame 101 and the housing body 100, install the positioning disc 301 into the second mounting hole 1061, and install a dial indicator through the dial indicator bracket 303 to measure the first mounting hole 1013.

[0061] S300. Press the head of the dial indicator against the hole wall of the first mounting hole 1013. First, zero the dial indicator, and then rotate the rotating shaft 302 to measure the runout values of two opposite points of the first mounting hole 1013 through the dial indicator, and calculate the difference △ between the two runout values.

[0062] S400. If the difference △ is less than or equal to the preset value, it indicates that the coaxiality of the first mounting hole 1013 and the second mounting hole 1061 meets the installation requirements; if the difference △ is greater than the preset value, it indicates that the coaxiality deviation between the first mounting hole 1013 and the second mounting hole 1061 is relatively large, affecting the installation accuracy of the transmission gear assembly, and then grind the adjusting pad 110 to reduce its thickness.

[0063] S500. Reassemble the ground adjusting pad 110, and then repeat steps S300 - S400 until the difference △ is not greater than the preset value, then the relative position of the first mounting hole 1013 and the second mounting hole 1061 meets the installation requirements of the transmission gear assembly.

[0064] The detection method of the accessory drive casing of the present application adopts the above-mentioned accessory drive casing detection device. The position of the drive bracket 101 is adjusted by the adjusting pad 110, and the thickness of the adjusting pad 110 is ground to finely adjust the drive bracket 101, so that the coaxiality error between the first mounting hole 1013 and the second mounting hole 1061 is not too large, thereby ensuring that the installation of the bevel gear pair meets the requirements. Since the pitch line intersection points of the driving bevel gear and the driven bevel gear need to coincide at point P when the bevel gear pair is working normally, and the pitch line intersection points of the bevel gears are virtual points and cannot be found during the assembly process, to verify whether the bevel gears are installed qualified, it is necessary to judge by checking the meshing backlash and tooth surface coloring of the bevel gear pair. And the present application can ensure the high precision of the overall assembly dimension chain by ensuring that the coaxiality between the first mounting hole 1013 on the drive bracket 101 and the second mounting hole 1061 on the casing outer ring 106 is within a high-precision range, and by strictly controlling the high-weight error value with the greatest influence, it ensures that the installation of the bevel gears is within the allowable error range. Therefore, the present application solves the problem of difficult measurement of the pitch line intersection points of the bevel gears by converting the measurement method. Considering the overall transmission dimension chain and converting the measurement direction, it can realize the efficient detection of the key components of the casing body 100, avoid repeated assembly, and effectively improve the assembly efficiency and precision.

[0065] In some embodiments, in step S100, multiple adjusting pads 110 with different thicknesses can be selected and grouped to form gasket groups with multiple thickness ranges. If the thickness deviation of the initially selected adjusting pad 110 is too large, one of the adjusting pads 110 in the adjacent thickness range can be selected and reinstalled, so that the adjusting pad 110 with a smaller thickness deviation can be found more quickly. In this way, the workload of subsequent grinding can be effectively reduced, which is beneficial to further improving the overall measurement and assembly efficiency.

[0066] Preferably, in step S300, the head of the dial indicator is abutted against the hole wall of the first mounting hole 1013, and four points A, B, C, and D evenly distributed in a circular array on the hole wall of the first mounting hole 1013 are selected. First, align with point B, zero the dial indicator through point B, and then rotate the rotating shaft 302 to align the dial indicator with point D to measure the runout value and direction, and obtain the runout value △4 of point D. If |△4| > the preset value, replace it with a new matching drive bracket 101 until |△4| ≤ the preset value, which is regarded as the new drive bracket 101 meeting the assembly accuracy requirements.

[0067] In this preferred embodiment, point A is in the direction close to the front of the engine, then point C is in the direction close to the rear of the engine.

[0068] In some embodiments, the preset value is 0.05. It should be noted that if ∣△4∣> the preset value, the purpose of replacing and matching the new drive rack 101 is to ensure that the intersection point formed by the rotation axis of the rotating shaft 302 of the measuring device, i.e., the coaxiality gauge, and the plane of the first mounting hole 1013 is no more than 0.025 mm away from the line connecting points A and C (eccentricity). In this case, it can be approximately considered that the intersection point is located on the line connecting points A and C.

[0069] In this preferred embodiment, if ∣△4∣≤ the preset value, then continue to measure the runout values and directions of points A and C respectively, record the runout values of the two points as △1 and △3 respectively, and calculate the difference △ = △1 - △3.

[0070] Preferably, in step S400, the final thickness S of the adjusting pad 110 after grinding is calculated by the following formula:

[0071] S = S0 - △÷2×cosα (1)

[0072] In the formula, S0 is the initial thickness of the adjusting pad 110 before grinding, and α is the shaft intersection angle β of the second driving bevel gear 107 and the first driving bevel gear 102 minus 90°, that is, α = β - 90°.

[0073] It should be noted that since the assembly procedure of the drive rack 101 of the engine casing main body 100 is: trial assembly - coaxiality inspection of the first mounting hole 1013 and the second mounting hole 1061 - calculation of the final thickness of the adjusting pad 110 - grinding of the adjusting pad 110 - re-assembly - coaxiality inspection. If the inspection tooling is not suitable or the calculation method is improper, then the adjusting pad 110 needs to be adjusted repeatedly, thus consuming a large amount of assembly time. Therefore, it is necessary to design a convenient coaxiality gauge and, through a fast inspection and calculation method, quickly calculate the thickness of the adjusting pad that meets the coaxiality requirements of the drive rack, reduce the steps of repeated adjustment, thereby saving assembly time and improving production efficiency. The detection device and detection method of the present application can be applied to a drive rack for the accessory drive of a turboprop engine.

[0074] It should be noted that in this article, the terms "including", "comprising" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0075] In this text, specific examples are used to elaborate on the principles and implementation manners of this application. The description of the above examples is only used to help understand the method and its core idea of this application. The above is only the preferred implementation manner of this application. It should be noted that due to the limitation of literal expression and objectively there are infinite specific structures. For those of ordinary skill in the art in this technical field, without departing from the principle of this application, several improvements, embellishments or changes can also be made, or the above technical features can be combined in an appropriate manner; these improvements, embellishments, changes or combinations, or directly applying the concept and technical solution of the invention to other occasions without improvement, should all be regarded as the protection scope of this application.

Claims

1. An accessory drive casing, characterized in that, It includes a casing main body (100), a transmission frame (101), a transmission gear assembly, and a connecting shaft (109). The transmission frame (101) is fixedly installed inside the casing main body (100). The transmission gear assembly includes a first driving bevel gear (102), a first driven bevel gear (103), and a second driving bevel gear (107). The first driving bevel gear (102) is installed in a transmission shaft hole (1011) of the transmission frame (101). The transmission frame (101) is provided with an inclined installation part (1012) beside the transmission shaft hole (1011). A first installation hole (1013) is opened on the inclined installation part (1012). The first installation hole (1013) is used to install the first driven bevel gear (103), and the first driven bevel gear (103) is used to mesh with the first driving bevel gear (102). A second installation hole (1061) coaxial with the first installation hole (1013) is opened on the outer casing (106) of the casing main body (100). The second driving bevel gear (107) is installed in the second installation hole (1061). The connecting shaft (109) is used to connect the first driven bevel gear (103) and the second driving bevel gear (107). The second driving bevel gear (107) is used to externally connect a driven component (200) and mesh with a second driven bevel gear (201) preset on the driven component (200).

2. An accessory drive gearbox detection device, characterized in that, For detecting the accessory drive casing as described in claim 1, the accessory drive casing detection device includes a coaxiality measuring mechanism (300) for measuring the coaxiality of the first installation hole (1013) and the second installation hole (1061), and an adjusting pad (110). The adjusting pad (110) is used to be padded on the joint surface between the transmission frame (101) and the casing main body (100). The adjusting pad (110) is used to adjust the position of the transmission frame (101), and further adjust the coaxiality of the first installation hole (1013) and the second installation hole (1061). The coaxiality measuring mechanism (300) includes a positioning disc (301), a rotating shaft (302), and a dial indicator bracket (303). A support (3011) is provided on the positioning disc (301). The first end of the rotating shaft (302) is used to sequentially pass through the support (3011) and a through hole preset on the positioning disc (301). The second end of the rotating shaft (302) is connected to the dial indicator bracket (303). The dial indicator bracket (303) is used to install a dial indicator. The positioning disc (301) is used to be installed in the second installation hole (1061). The rotating shaft (302) is used to drive the dial indicator bracket (303) and the dial indicator to rotate to measure the runout values at different positions of the first installation hole (1013).

3. The accessory drive gearbox detection device according to claim 2, characterized in that A limit retaining ring (3021) is arranged in the middle of the rotating shaft (302). The limit retaining ring (3021) is used to abut against the top of the support (3011) after the first end of the rotating shaft (302) sequentially passes through the support (3011) and the positioning disc (301), so as to support and position the rotating shaft (302).

4. The accessory drive gearbox detection device according to claim 3, wherein, The accessory drive gearbox detection device further includes a locking member (305). The locking member (305) is sleeved on the first end of the rotating shaft (302) and is threadedly connected to the rotating shaft (302). The locking member (305) is used to abut against the side of the positioning disc (301) away from the support member (3011) to cooperate with the limit retaining ring (3021) to limit the rotating shaft (302) axially along the support member (3011).

5. An accessory drive gearbox detection device according to claim 2, characterized in that A limit platform (3012) is provided on the side of the positioning disc (301) away from the support member (3011). The limit platform (3012) is used to abut against the side wall of the gearbox outer ring (106) when the positioning disc (301) is installed in the second mounting hole (1061) to limit the positioning disc (301).

6. The accessory drive gearbox detection device according to claim 2, characterized in that, The accessory drive gearbox detection device further includes a rotating handle (304). The first end of the rotating shaft (302) passes through the support member (3011) and the positioning disc (301) in sequence and is connected to the rotating handle (304).

7. A detection method for a detection device of an accessory drive casing, characterized in that, When using the accessory drive gearbox detection device according to any one of claims 2-6, the detection method includes the following steps: S100. Select an adjusting pad (110) and record its original size S0; S200. Install the adjusting pad (110) on the joint surface between the transmission rack (101) and the gearbox main body (100), install the positioning disc (301) in the second mounting hole (1061), and install a dial indicator on the first mounting hole (1013) through the dial indicator bracket (303) for measurement; S300. Press the head of the dial indicator against the hole wall of the first mounting hole (1013). First, zero the dial indicator, and then rotate the rotating shaft (302) to measure the runout values of two opposite points on the first mounting hole (1013) through the dial indicator, and calculate the difference △ between the two runout values; S400. If the difference △ is less than or equal to the preset value, it means that the coaxiality of the first mounting hole (1013) and the second mounting hole (1061) meets the installation requirements; if the difference △ is greater than the preset value, it means that the coaxiality deviation of the first mounting hole (1013) and the second mounting hole (1061) is large, affecting the installation accuracy of the transmission gear assembly, then grind the adjusting pad (110) to reduce its thickness; S500. Reassemble the ground adjusting pad (110), and then repeat steps S300-S400 until the difference △ is not greater than the preset value, then the relative positions of the first mounting hole (1013) and the second mounting hole (1061) meet the installation requirements of the transmission gear assembly.

8. The detection method of an accessory drive gearbox detection device according to claim 7, characterized in that, In step S300, press the head of the dial indicator against the hole wall of the first mounting hole (1013). Select four points A, B, C, and D evenly distributed in a circular array on the hole wall of the first mounting hole (1013). First, align with point B, zero the dial indicator through point B, and then rotate the rotating shaft (302) to align the dial indicator with point D to measure the runout value and direction, and obtain the runout value △4 of point D. If |△4| > the preset value, replace the matching new transmission rack (101) until |△4| ≤ the preset value, and consider that the new transmission rack (101) meets the assembly accuracy requirements.

9. The detection method of an accessory drive gearbox detection device according to claim 8, characterized in that If |Δ4| ≤ the preset value, continue to measure the runout values and directions of point A and point C respectively, record the runout values of the two points as Δ1 and Δ3 respectively, and calculate the difference Δ = Δ1 - Δ3 between the two.

10. The detection method of an accessory drive gearbox detection device according to claim 7, characterized in that, In step S400, the final thickness S of the adjusting pad (110) after grinding is calculated by the following formula: S = S0 - Δ÷2×cosα (1) In the formula, S0 is the initial thickness of the adjusting pad (110) before grinding, and α is the shaft intersection angle β of the second driving bevel gear (107) minus 90° from the first driving bevel gear (102), that is, α = β - 90°.

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