A planetary gear transmission load-sharing test device and its installation and testing method

Abstract

The present invention relates to a planetary gear transmission load-balancing test device and its installation and testing method. The problem of how to arrange the signal line of the strain gauge in the transmission system is solved. It includes a strain gauge, a signal line, a signal chamber assembly and a data export screw. One end of the signal line is connected to the strain gauge, and the other end of the signal line passes through the signal chamber assembly and is connected to the data export screw; the signal chamber assembly includes a partition, an axial positioning pin, an anti-vibration O-ring and an electronic compartment. The right end side wall of the electronic compartment is processed with a data export hole. The data export screw is detachably connected to the electronic compartment through the data export hole. The signal line passes through the partition, the anti-vibration O-ring, the electronic compartment and is connected to the data export screw in sequence. A number of axial positioning pins are installed on the partition, and the anti-vibration O-ring is a shock-absorbing rubber ring. The present invention can not only accurately collect dynamic loads in real time, but also maintain uniform mass distribution under static and dynamic conditions, so that the overall operation of the device is stable and the test results are accurate.

Description

Technical Field

[0001] The invention relates to a load-sharing test device and an installation and testing method thereof, and belongs to the technical field of planetary gear transmission. Background Art

[0002] Strain measurement is one of the most widely used and mature stress measurement technologies. The resistance strain gauge method is based on the strain effect of the resistance wire. That is, the resistance strain gauge is pasted on the test piece. When the test piece is deformed by the external load, the resistance strain gauge also produces the same deformation, so that the length of the strain gauge sensitive grid changes, causing the change of the resistance value of the metal wire. The resistance strain gauge measures the slight change of the resistance value of the strain gauge to obtain the strain change of the test piece.

[0003] Planetary gear transmission is an important form of transmission, widely used in aviation, aerospace, shipbuilding, automobile, wind power and other fields. It has the advantages of power branching, large transmission ratio, coaxial input and output, small size, smooth transmission and high efficiency. It is mainly due to the use of multiple planetary gears to share the load in the structure, forming power diversion and reasonable use of internal meshing transmission. In the design and use process, it is theoretically required that multiple planetary gears can evenly share the load at the same time. However, due to the inevitable influence of many factors such as manufacturing, installation, deformation, temperature, etc., the ideal balanced load situation is difficult to exist in actual use. The load-sharing performance has always been one of the key issues in the study of planetary gear transmission. Monitoring the stress of planetary transmission parts is one of the most effective means to analyze the load-sharing performance of planetary gear transmission and verify the load-sharing design. In the planetary gear transmission, there are three basic components: sun gear, inner ring gear and planet carrier. The most direct way to measure the load is to directly measure the force on the teeth of the transmission gear. How to measure on the rotating gear becomes a thorny problem.

[0004] The publication number is CN117147139A, and the name of the invention is a planetary gear telemetry load-balancing coefficient test system and method. Its technical solution is that the strain gauge converts the gear change information from stress to resistance value, and obtains the load-balancing coefficient of the monitored planetary gear part, which has more efficient monitoring capabilities. In actual application, the strain gauge needs to transmit data through the signal line, and the installation of the signal line should not interfere with the action of the transmission system, nor affect the mass distribution of the transmission system. The comparative document does not provide a solution, nor does it explain the specific installation location of the strain gauge, which affects the test results.

[0005] Therefore, it is urgent to propose a planetary gear transmission load-sharing test device and its installation and testing method to solve the above technical problems. Summary of the invention

[0006] The purpose of the present invention is to solve the problem of how to arrange the signal line of the strain gauge in the transmission system, to provide a planetary gear transmission load-sharing test device and its installation and testing method, and a brief overview of the present invention is given below to provide a basic understanding of certain aspects of the present invention. It should be understood that this overview is not an exhaustive overview of the present invention. It is not intended to identify the key or important parts of the present invention, nor is it intended to limit the scope of the present invention.

[0007] The technical solution of the present invention:

[0008] A planetary gear transmission load-balancing test device comprises a strain gauge, a signal line, a signal bin assembly and a data export screw, wherein one end of the signal line is connected to the strain gauge, and the other end of the signal line passes through the signal bin assembly and is connected to the data export screw;

[0009] The signal compartment assembly includes a partition, an axial positioning pin, an anti-vibration O-ring and an electronic compartment. The right end side wall of the electronic compartment is processed with a data export hole, and the data export screw is detachably connected to the electronic compartment through the data export hole. The signal line passes through the partition, the anti-vibration O-ring, the electronic compartment and the data export screw in sequence. A number of axial positioning pins are installed on the partition, and the anti-vibration O-ring is a shock-absorbing rubber ring.

[0010] Preferably, it also includes a cable plug, the branch signal lines through which the strain gauge is connected to the main signal line, and the main signal line, the cable plug and the strain signal cable are connected in series.

[0011] Preferably: it also includes a counterweight bolt, and a positioning pin hole is processed on the symmetrical side wall of the electronic cabin data export hole, and the counterweight bolt is connected to the electronic cabin through the positioning pin hole, so that the counterweight bolt and the data export screw are symmetrically arranged.

[0012] A method for installing a planetary gear transmission load-sharing test device comprises the following steps:

[0013] Step 1: A mounting through hole arranged in a radial direction is processed on the right end side wall of the input shaft;

[0014] Step 2: Connect one end of the strain gauge signal cable to the cable plug, and the other end of the strain gauge signal cable passes through the partition and the anti-vibration O-ring in sequence and enters the electronic compartment;

[0015] Step 3: Insert the electronic cabin into the input shaft, make the data export hole of the electronic cabin correspond to the installation through hole, connect the data export screw with the other end of the strain signal cable, and install the data export screw to the installation through hole and the data export hole to fix it;

[0016] Step 4: Use the axial locating pin to connect the partition plate to the input shaft, and the anti-vibration O-ring is interference fit with the inner wall of the input shaft;

[0017] Step 5: Set a strain gauge on the teeth of the sun gear, and connect the strain gauge in parallel to the main signal line through the branch signal line.

[0018] Preferably: in step 1, the number of the mounting through holes is two, and the two mounting through holes are symmetrically arranged;

[0019] In step three, one mounting through hole corresponds to the data export hole, and the other mounting through hole corresponds to the positioning pin hole, and the counterweight bolt is installed and fixed at the mounting through hole and the positioning pin hole;

[0020] In step five, the number of strain gauges is three, and the arrangement of the strain gauges is as follows: strain gauges are pasted at selected points in the middle of the tooth width and on both sides along the axial direction of the tooth, and the three strain gauges are connected in parallel to the main signal line through corresponding branch signal lines. The main signal line is set along the radial direction of the sun gear, and then the main signal line is connected to the cable plug.

[0021] A planetary gear transmission load balancing test method comprises the following steps:

[0022] Step 1: Divide the sun gear into N equal parts along the circumferential direction, where N is a natural number. Select one tooth for each part, for a total of N teeth.

[0023] Step 2: Paste strain gauges at selected points in the middle and on both sides of the tooth width along the axial direction of the selected N teeth;

[0024] Step 3: The input shaft drives the sun gear to rotate, realizing the rotation of the planetary gears. The strain gauges on the teeth collect the load in real time, and the data can be exported regularly through the data export bolts for analysis.

[0025] Preferred: Suitable for applications where load measurement is performed on each branch of a planetary gear transmission system.

[0026] The present invention has the following beneficial effects:

[0027] (1) The present invention has an ingenious structure and low cost, and can comprehensively extract the load information of individual gears on the sun gear, making the test more accurate;

[0028] (2) The present invention avoids interference with the strain gauge during the installation process, and can intuitively observe and measure the length of the required signal line, thereby preventing the signal line from moving or scratching due to centrifugal force. The present invention has good adaptability and is suitable for load-balanced testing of planetary gear transmission systems.

[0029] (3) The present invention reasonably divides the teeth on the sun gear into equal parts, and selects one or more teeth in each equally divided tooth to install a strain gauge group. This can not only accurately collect dynamic loads in real time, but also maintain uniform mass distribution under static and dynamic conditions, so that the overall operation of the device is stable and the test results are accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a use state of a planetary gear transmission load-balancing test device;

[0031] Figure 2 It is a schematic diagram of the partial structure installation of a planetary gear transmission load-sharing test device;

[0032] Figure 3 It is a partial structural schematic diagram of a planetary gear transmission load-sharing test device;

[0033] Figure 4 Schematic diagram of the connection of strain gauges in the bridge.

[0034] In the figure: 1-output flange, 2-first end cover, 3-first bearing, 4-lower housing, 5-output shaft, 6-input shaft, 7-sun gear, 8-planet carrier, 9-inner ring gear, 10-second bearing, 11-connecting bolt, 12-pin, 13-second end cover, 14-upper housing, 15-planet gear, 16-planet gear shaft, 17-cable plug, 19-sealing strip, 20-signal compartment assembly, 21-counterweight bolt, 22-data export screw, 18, 23-small bolt, 24-partition, 25-axial positioning pin, 26-anti-vibration O-ring, 27-electronic compartment, L1, L2, L3-sub-signal lines, L4-total signal line, L5-strain signal cable, P1, P2, P3-strain gauge. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is described below by the specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0036] Specific implementation method 1: Combination Figure 1-4 The present embodiment is described. A planetary gear transmission load balancing test device of the present embodiment comprises a strain gauge, a signal line, a signal bin assembly 20 and a data export screw 22. One end of the signal line is connected to the strain gauge, and the other end of the signal line passes through the signal bin assembly 20 and is connected to the data export screw 22.

[0037] The signal compartment assembly 20 includes a partition 24, an axial positioning pin 25, an anti-vibration O-ring 26 and an electronic compartment 27. The right end side wall of the electronic compartment 27 is processed with a data export hole, and the data export screw 22 is detachably connected to the electronic compartment 27 through the data export hole. The signal line passes through the hole in the middle of the partition 24, the anti-vibration O-ring 26, the inner cavity of the electronic compartment 27 and is connected with the data export screw 22 in sequence. A plurality of axial positioning pins are installed on the partition 24. The anti-vibration O-ring 26 is fitted with the left end of the electronic compartment 27. The anti-vibration O-ring 26 is a shock-absorbing rubber ring. The present invention fixes the position of the signal line without excess installation length to prevent interference with the movement of the transmission system. In the process of rotating with the sun gear, the signal line is not subject to bending and scratching, the signal transmission is stable and reliable, and the influence of centrifugal force is overcome, so that the mass can still be evenly distributed, ensuring the smooth operation of the entire transmission system.

[0038] Specific implementation method 2: Combination Figure 1-4 To illustrate this embodiment, a planetary gear transmission load balancing test device according to this embodiment also includes a cable plug 17, and the branch signal line through which the strain gauge is connected to the main signal line, the main signal line, the cable plug 17, and the strain signal cable L5 are connected in series, and the signal line includes a branch signal line, a main signal line, and a strain signal cable.

[0039] Specific implementation method three: Combination Figure 1-4 To explain this embodiment, a planetary gear transmission load balancing test device according to this embodiment also includes a counterweight bolt 21. A radial positioning pin hole is processed on the symmetrical side wall of the data export hole of the electronic cabin 27. The counterweight bolt 21 is connected to the electronic cabin 27 through the positioning pin hole, so that the counterweight bolt 21 and the data export screw 22 are symmetrically arranged; the signal compartment assembly is axially fixed to the end face of the sun gear by bolts, and the signal compartment assembly is radially fixed by the counterweight bolts and the data export bolts to prevent the signal compartment from rotating, and the weight balance in the sun gear is achieved by the counterweight bolts and the data export bolts to avoid the imbalance of the sun gear due to uneven weight distribution, resulting in adverse consequences such as increased vibration.

[0040] Specific implementation method four: Combination Figure 1-4The present embodiment is described. The present embodiment is a method for installing a planetary gear transmission load balancing test device. The planetary gear transmission load balancing test device is used. The planetary gear transmission structure includes an output flange 1, a first end cover 2, a first bearing 3, a lower housing 4, an output shaft 5, an input shaft 6, a sun gear 7, a planet carrier 8, an inner gear ring 9, a second bearing 10, a connecting bolt 11, a pin 12, a second end cover 13, an upper housing 14, a planetary gear 15 and a planetary gear shaft 16. The middle of the right side of the housing is connected by a second The bearing 10 is connected to the planet carrier 8. The input shaft 6 is a hollow shaft. One end of the input shaft 6 is connected to the sun gear 7 through an arc key. A strain gauge is bonded to the teeth of the sun gear 7. After bonding, the signal lines are gathered and placed in the signal compartment assembly 20. The mounting through hole on the input shaft 6 is correspondingly arranged with the data export hole on the electronic compartment 27. The data export screw 22 passes through the mounting through hole and is detachably connected to the data export hole. The other end of the input shaft 6 is extended out of the box body through the through hole in the middle of the planet carrier 8, so that the data export screw 22 is arranged on the outside of the box body for easy disassembly. Uninstall, install and use, then install the planetary gear 15 on the planetary carrier 8, the planetary gear 15 and the planetary carrier 8 are rotatably connected through the planetary gear shaft 16. During installation, the planetary gear 15 meshes with the teeth of the sun gear 7 without the strain gauge installed to prevent the strain gauge from being axially scratched and affecting the subsequent test results. The inner gear ring 9 is connected to the right side of the box through the pin 12, and the inner gear ring 9 is coaxially arranged on the outside of the planetary carrier 8. The inner gear ring 9 meshes with the planetary gear 15. The other end of the output shaft 5 is provided with an output flange 1 on the outside of the box. The output shaft 5 is connected to the box through the first bearing 3. The left side is connected, one end of the output shaft 5 is bolted to the planetary frame 8, one end of the output shaft 5 is connected to the planetary gear 15 through the planetary gear shaft 16, the output flange 1 is coaxially arranged with the planetary frame 8, the lower box body 4 and the upper box body 14 are symmetrically connected to form a box body, the above structure can be connected before the upper box body, and the lower box body is installed after the assembly is completed, the second end cover 13 presses the outer ring of the second bearing 10 and is detachably connected to the right side of the box body through the connecting bolts 11, and the first end cover 2 presses the outer ring of the first bearing 3 and is detachably connected to the left side of the box body; it includes the following steps:

[0041] Step 1: A mounting through hole arranged in a radial direction is processed on the right end side wall of the input shaft 6, the axis of the mounting through hole passes through the axis of the input shaft 6 and is perpendicular to it, and a mounting groove is processed on the left end face of the input shaft 6, and a connecting hole parallel to the axis of the input shaft 6 is processed in the mounting groove;

[0042] Step 2: The storage unit is connected to the signal cable L6, one end of the strain signal cable L5 is connected to the storage unit, the storage unit is placed in the electronic compartment 27, the signal cable L6 is arranged at the data export hole, the other end of the strain signal cable L5 extends from the electronic compartment 27, passes through the anti-vibration O-ring 26, the partition plate 24 and is connected to the cable plug 17 in sequence, so that the strain signal cable L5 is arranged axially;

[0043] Step 3: Insert the electronic compartment 27 into the input shaft 6, set a sealing strip 19 between the electronic compartment 27 and the input shaft to prevent oil, make the data export hole of the electronic compartment 27 correspond to the installation through hole, connect the data export screw 22 to the storage unit through the radial signal cable L6, and install the data export screw 22 to the installation through hole and the data export hole to fix;

[0044] Step 4: The partition 24 is set in the installation groove, and the axial positioning pin 25 is inserted into the connecting hole in the installation groove to connect the partition 24 to the left end face of the input shaft 6. The partition 24 further tightens the electronic cabin 27 by pressing the anti-vibration O-ring 26, and the anti-vibration O-ring 26 is interference fit with the inner wall of the input shaft 6;

[0045] Step 5: A strain gauge is arranged on the teeth of the sun gear 7 . The strain gauge is connected in parallel to the main signal line L4 through a branch signal line. The radial main signal line L4 is connected to the cable plug 17 .

[0046] Specific implementation method five: Combination Figure 1-4 This embodiment is described. In this embodiment, a method for installing a planetary gear transmission load-sharing test device is provided. In step 1, the number of the installation through holes is two, and the two installation through holes are symmetrically arranged. The axis of the installation through hole passes through the axis of the input shaft 6 and is perpendicular to it.

[0047] In step 3, one mounting through hole corresponds to the data export hole, and the other mounting through hole corresponds to the positioning pin hole, and the counterweight bolt 21 is installed and fixed at the mounting through hole and the positioning pin hole, which plays a positioning role, makes the connection more stable, and can counterweight to balance the weight distribution;

[0048] In step five, the number of strain gauges is three, and three strain gauges form a group. One group of strain gauges is installed on the same tooth. The arrangement of strain gauges P1, P2, and P3 is as follows: strain gauges are respectively pasted at selected points in the middle and on both sides of the tooth width along the axial direction of the tooth. The present invention has an ingenious structure and low cost, and can comprehensively extract the load information of individual gears on the sun gear, making the test more accurate. The strain gauge is bridged, and the specification length of the appropriate sub-signal line and the total signal line can be intuitively observed after the strain gauge is installed. The three strain gauges are respectively connected in parallel to the total signal line through the corresponding sub-signal lines. The total signal line is arranged along the radial direction of the sun gear, and then the total signal line is connected to the cable plug 17 at the axial position. Several sun gear teeth can be selected to install strain gauges as needed.

[0049] Specific implementation method six: Combination Figure 1-4 This embodiment is described. A planetary gear transmission load balancing test method of this embodiment adopts the planetary gear transmission load balancing test device, and includes the following steps:

[0050] Step 1: Divide the sun gear 7 into N equal parts along the circumferential direction, where N is a natural number, and select one tooth for each part, for a total of N teeth;

[0051] Step 2: Strain gauges are respectively attached to the selected N teeth at the middle and both sides of the tooth width along the axial direction, and the sub-signal lines are respectively led out. After being aggregated into the total signal line, they are led to the center hole of the sun gear along the diameter direction of the sun gear and aggregated to the signal cable plug 17. The signal cable plug is fixed to the signal bin or the partition 24 installed in the center hole of the sun gear by a small bolt 18 to make the mass distribution uniform and ensure that the signal line will not be affected by the centrifugal force and move randomly. The data is stored in the storage unit in the electronic compartment 27 of the signal bin assembly;

[0052] Step 3: The input shaft 6 drives the sun gear 7 to rotate, so as to realize the rotation of the planetary gear 17. The strain gauges on the teeth collect the load in real time. There is a gap between the teeth when meshing. Therefore, the dynamic load is collected through three force postures. The data can be exported regularly through the data export bolt for analysis to determine whether the dynamic load is uniform, the meshing state, and the wear of the main force-bearing parts of the individual teeth. Problems can be discovered in time and early warning can be provided to provide sufficient time for fault resolution. It is used in the occasion of planetary gear transmission load testing to solve the problem that it is difficult to test the planetary gear transmission with balanced load, and provide a solution for the evaluation of the balanced load performance of the planetary gear transmission. The data is stored in the storage unit in the signal compartment 20, and the storage unit is fixedly connected to the electronic compartment. The strain signal cable, the storage unit, and the signal cable are connected in sequence. The data can be exported regularly from the data export bolt through the signal cable for analysis.

[0053] Specific implementation method seven: Combination Figure 1-4 The present embodiment is described. A planetary gear transmission load-balanced testing method of the present embodiment is suitable for application occasions of load measurement of various branches of a planetary gear transmission system. At the same time, the length of the required signal line can be intuitively observed and measured, and the adaptability is good. The present testing method can be used for the measurement of axial stress or radial stress of high-speed shafts in other occasions, and the measurement of various branches of the planetary gear transmission can be realized. The force of the transmission components within a certain operating cycle can be obtained, and the changes in the force of the transmission components during the operation of the planetary gear transmission system can be analyzed, and corresponding protective measures can be taken in time to avoid further failures and damages, which will bring adverse consequences to the use of the equipment.

[0054] It should be noted that in the above embodiments, as long as the technical solutions are not contradictory, they can be arranged and combined, and those skilled in the art can exhaust all possibilities based on the mathematical knowledge of arrangement and combination. Therefore, the present invention will no longer describe the technical solutions after arrangement and combination one by one, but it should be understood that the technical solutions after arrangement and combination have been disclosed by the present invention.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for installing a planetary gear transmission load-sharing test device, characterized in that: A planetary gear transmission load-balancing test device is used, comprising a strain gauge, a signal line, a signal chamber assembly (20), and a data export screw (22), wherein one end of the signal line is connected to the strain gauge, and the other end of the signal line passes through the signal chamber assembly (20) and is connected to the data export screw (22); The signal compartment assembly (20) comprises a partition (24), an axial positioning pin (25), an anti-vibration O-ring (26) and an electronic compartment (27); a data export hole is processed on the right end side wall of the electronic compartment (27); a data export screw (22) is detachably connected to the electronic compartment (27) through the data export hole; a signal line sequentially passes through the partition (24), the anti-vibration O-ring (26), the electronic compartment (27) and is connected to the data export screw (22); a plurality of axial positioning pins are installed on the partition (24); and the anti-vibration O-ring (26) is a shock-absorbing rubber ring; It also includes a cable plug (17), through which the strain gauge is connected to the main signal line (L4), and the main signal line (L4), the cable plug (17), and the strain signal cable (L5) are connected in series; It also includes a counterweight bolt (21), a positioning pin hole is processed on the symmetrical side wall of the data export hole of the electronic cabin (27), and the counterweight bolt (21) is connected to the electronic cabin (27) through the positioning pin hole, so that the counterweight bolt (21) and the data export screw (22) are symmetrically arranged; The method comprises the following steps: Step 1: a radially arranged mounting through hole is machined on the right end side wall of the input shaft (6); Step 2: One end of the strain signal cable (L5) is connected to the cable plug (17), and the other end of the strain signal cable (L5) passes through the partition (24) and the anti-vibration O-ring (26) in sequence and enters the electronic compartment (27); Step 3: Insert the electronic compartment (27) into the input shaft (6) so that the data export hole of the electronic compartment (27) corresponds to the mounting through hole, connect the data export screw (22) to the other end of the strain signal cable (L5), and install the data export screw (22) to the mounting through hole and the data export hole to fix; Step 4: Use the axial locating pin (25) to connect the partition plate (24) to the input shaft (6); Step 5: A strain gauge is arranged on the teeth of the sun gear (7), and the strain gauge is connected in parallel to the main signal line (L4) through the branch signal line, and the radial main signal line is connected to the cable plug.

2. The method for installing a planetary gear transmission load-sharing test device according to claim 1, characterized in that: In step 1, the number of mounting through holes is two, and the two mounting through holes are symmetrically arranged; In step 3, one mounting through hole corresponds to the data export hole, and the other mounting through hole corresponds to the positioning pin hole, and the counterweight bolt (21) is installed and fixed at the mounting through hole and the positioning pin hole; In step five, the number of strain gauges is three, and the arrangement of the strain gauges is as follows: the strain gauges are respectively pasted at selected points in the middle and on both sides of the tooth width along the axial direction of the tooth, and the three strain gauges are respectively connected in parallel to the main signal line (L4) through corresponding branch signal lines (L1, L2, L3). The main signal line (L4) is set along the radial direction of the sun gear, and then the main signal line (L4) is connected to the cable plug (17).

3. A planetary gear transmission load balancing test method, characterized in that: A planetary gear transmission load balancing test device according to any one of claims 1 to 2 is used, comprising the following steps: Step 1: Divide the sun gear (7) into N equal parts along the circumferential direction, where N is a natural number, and select one tooth from each part, for a total of N teeth; Step 2: Paste strain gauges at selected points in the middle and on both sides of the tooth width along the axial direction of the selected N teeth; Step 3: The sun gear (7) is driven to rotate by the input shaft (6), thereby realizing the rotation of the planetary gear (15). The strain gauges on the teeth collect the load in real time, and the data can be exported regularly through the data export bolt for analysis.

4. A planetary gear transmission load balancing test method according to claim 3, characterized in that: Suitable for applications where load measurement is required on various branches of a planetary gear transmission system.

Images