A spur gear backlash measuring device

Abstract

This application discloses a spur gear backlash measuring device, including a first drive unit, a first limiting unit, and an angle encoder. The first drive unit includes a drive shaft and a first gripper, with the output end of the drive shaft connected to the first gripper. The first gripper is used to connect to an input shaft. The first limiting unit is circumferentially rotatable around the drive shaft. The first limiting unit includes a second gripper, which is used to connect to the output shaft. Using the measuring device provided in this application, the position of the first limiting unit relative to the first drive unit can be adjusted to achieve rapid positioning and connection of the input and output shafts of the product to be measured, thereby improving measurement efficiency. Furthermore, the actual rotation angle of the teeth of the driving gear is obtained through the angle encoder, and the actual rotation angle is compared with the theoretical rotation angle to determine whether the meshing degree of the gear system meets the theoretical range, thereby effectively improving the measurement efficiency and accuracy of the gear system meshing degree.

Description

Technical Field

[0001] This application relates to the field of gear testing technology, and in particular to a spur gear backlash measuring device. Background Technology

[0002] Gear systems generally include two major series: fixed-axis gear systems and planetary gear systems. They can realize split-path transmission and speed change transmission, and are widely used in the automotive assembly field and the military industry.

[0003] The aircraft gearbox is a core structural component of an aero-engine, often referred to as the engine's "skeleton." It houses the gear train, and during engine operation, a major source of noise is low gear meshing precision. Specifically, during the meshing transmission between the driving and driven gears, the resulting excitations (including stiffness excitation, transmission error excitation, and meshing impact excitation) cause periodic vibrations in the gearbox, generating noise that directly impacts the engine's lifespan. Therefore, the meshing precision of the internal gear train must be tested before the engine leaves the factory. Currently, the measurement of gear meshing precision within engines is mostly done manually through random checks, resulting in low accuracy and efficiency.

[0004] Therefore, how to improve the measurement accuracy and efficiency of gear meshing degree has become a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] This application provides a spur gear backlash measuring device to improve the measurement accuracy and efficiency of gear meshing degree.

[0006] This application provides a spur gear backlash measuring device. The product to be measured includes an input shaft, a driving gear, an output shaft, and a driven gear. The input shaft is inserted into the inner hole of the driving gear, and the output shaft is inserted into the inner hole of the driven gear. The driving gear is used to mesh with the driven gear. The spur gear backlash measuring device includes a first driving part, a first limiting part, and an angle encoder. The first driving part includes a driving shaft and a first gripper. The output end of the driving shaft is connected to the first gripper. The first gripper is used to connect to the input shaft. The first limiting part is spaced apart from the first driving part along the radial direction of the driving shaft. The first limiting part can rotate circumferentially around the driving shaft. The first limiting part includes a second gripper, which is used to connect to the output shaft. The angle encoder is used to detect the rotation angle of the teeth of the driving gear.

[0007] Using the spur gear backlash measuring device provided in this application, since the angle encoder is used to detect the rotation angle of the teeth of the driving gear, and the second limiting part is used to limit the rotation of the output shaft, the driven gear is relatively stationary during the rotation of the driving gear. Therefore, the driving gear is first rotated clockwise, and stops rotating when the sidewall of the teeth of the driving gear abuts against the sidewall of the teeth of the driven gear. Then, the driving gear is rotated counterclockwise, and stops rotating when the sidewall of the teeth of the driving gear abuts against the sidewall of the teeth of the driven gear. During this process, the actual rotation angle of the teeth of the driving gear can be obtained through the angle encoder. Then, by comparing the actual rotation angle of the teeth of the driving gear with the theoretical rotation angle, it can be determined whether the meshing degree of the gear system meets the theoretical range, thereby effectively improving the measurement efficiency and accuracy of the gear system meshing degree.

[0008] Understandably, since the first limiting part can rotate circumferentially around the first mounting part, the position of the first limiting part relative to the first driving part can be adjusted to achieve rapid positioning and connection of the input and output shafts of the product to be measured, thereby improving measurement efficiency. Simultaneously, it allows the spur gear backlash measuring device to meet the positional requirements of gear systems of different specifications, which is beneficial to improving the versatility of the spur gear backlash measuring device.

[0009] In one possible implementation of this application, the spur gear backlash measuring device further includes a housing, with the drive shaft passing through the housing along the axial direction of the drive shaft and rotatably connected to the housing.

[0010] In one possible implementation of this application, the spur gear backlash measuring device further includes a second drive unit and a rotary support. The second drive unit is mounted on the housing. Along the circumference of the drive shaft, the rotary support surrounds the drive shaft and is rotatably connected to the drive shaft. The side wall of the rotary support opposite to the drive shaft is provided with a toothed surface. The second drive unit includes a drive gear that meshes with the toothed surface of the rotary support. Along the axial direction of the drive shaft, the side wall of the rotary support is connected to the first limiting part through a first connecting structure.

[0011] In one possible implementation of this application, the spur gear backlash measuring device further includes a first linear guide rail, which is disposed on the side of the first connecting structure facing the first limiting portion along the axial direction of the drive shaft and extends radially along the drive shaft; the first limiting portion is slidably connected to the first linear guide rail.

[0012] In one possible implementation of this application, the first limiting portion further includes a first mounting bracket and a second linear guide rail. Along the axial direction of the drive shaft, the first mounting bracket is located between the second gripper and the first linear guide rail. The second linear guide rail is connected to the second gripper and extends along the axial direction of the drive shaft; along the axial direction of the drive shaft, the second gripper is slidably connected to the first mounting bracket via the second linear guide rail.

[0013] In one possible implementation of this application, the spur gear backlash measuring device further includes a base structure and a second mounting bracket, which is slidably connected to the base structure along the radial direction of the drive shaft. Along the axial direction of the drive shaft, the housing is slidably connected to the second mounting bracket.

[0014] In one possible implementation of this application, the first drive unit further includes a second connecting structure and a third linear guide rail. The second connecting structure is connected to one end of the drive shaft, and the third linear guide rail is disposed on the plate surface of the second connecting structure opposite to the drive shaft and extends radially along the drive shaft; the first gripper is slidably connected to the third linear guide rail.

[0015] In one possible implementation of this application, the first driving unit further includes a third connecting structure and a fourth linear guide rail. The third connecting structure is slidably connected to the third linear guide rail, and the fourth linear guide rail is disposed on the plate surface of the third connecting structure that is away from the third linear guide rail, and its projection toward the third linear guide rail intersects with the third linear guide rail; the first gripper is slidably connected to the fourth linear guide rail.

[0016] In one possible implementation of this application, the spur gear backlash measuring device further includes an installation station and a second limiting part. The installation station is used to install the product to be measured. Along the axial direction of the drive shaft, the second limiting part is opposite to the first limiting part relative to the installation station. The second limiting part includes a third gripper, which is used to insert into the shaft hole of the output shaft and tighten the output shaft connection.

[0017] In one possible implementation of this application, the spur gear backlash measuring device further includes a base structure, a fifth linear guide rail, and a third mounting bracket. The fifth linear guide rail is disposed on the base structure and extends radially along the drive shaft. The third mounting bracket is slidably connected to the fifth linear guide rail. Along the axial direction of the drive shaft, the second limiting portion is slidably connected to the third mounting bracket. Attached Figure Description

[0018] Figure 1 A schematic diagram of a spur gear backlash measuring device provided in this application; Figure 2 for Figure 1 A schematic diagram of the first limiting part and the first driving part of the provided spur gear backlash measuring device; Figure 3 for Figure 2 A magnified view of point A in the image; Figure 4 for Figure 2 A schematic diagram along the positive Z-axis; Figure 5 for Figure 2 A schematic diagram along the negative Y-axis; Figure 6 for Figure 5A magnified view of section B in the image; Figure 7 for Figure 1 A magnified view of point C in the image; Figure 8 for Figure 1 A partial schematic diagram of the base structure of the provided spur gear backlash measuring device; Figure 9 This is a schematic diagram of a structure for the second limiting part.

[0019] Reference numerals: 01-Product to be measured; 1-First drive unit; 11-Drive shaft; 12-First gripper; 121-Pneumatic chuck; 122-Pneumatic gripper; 13-First servo motor; 14-Drive wheel; 15-Synchronous belt; 16-Second connecting structure; 17-Third linear guide; 18-Third connecting structure; 19-Fourth linear guide; 101-First slider; 102-Second slider; 2-First limiting unit; 21-Second gripper; 22-First mounting bracket; 23-Second linear guide; 24-Fourth connecting structure Structure; 3-Box; 4-Second mounting bracket; 5-Base structure; 51-Horizontal support bracket; 52-Vertical support bracket; 6-Cylinder; 61-Cylinder body; 62-Connector seat; 7-Rotating support; 8-Second drive unit; 81-Drive gear; 82-Bearing seat; 9-First connecting structure; 10-First linear guide rail; 011-Installation station; 012-Second limiting unit; 0121-Third gripper; 013-Third mounting bracket; 014-Fifth linear guide rail; 015-Sixth linear guide rail; 016-Tensioning structure. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings. However, the exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein. The same reference numerals in the figures denote the same or similar structures, and therefore repeated descriptions of them will be omitted. The terms expressing position and direction described in the embodiments of this application are illustrative based on the accompanying drawings, but changes can be made as needed, and all such changes are included within the scope of protection of this application. The accompanying drawings of the embodiments of this application are only for illustrating relative positional relationships and do not represent actual scale.

[0021] It should be noted that specific details are set forth in the following description to facilitate understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0022] Gear systems generally include two main series: fixed-axis gear systems and planetary gear systems. They can achieve split-path transmission and speed change transmission, and are widely used in automotive assembly and military industries. This application will use aircraft engines as an example to provide a detailed description of gear system testing equipment.

[0023] The aircraft gearbox is a core structural component of an aero-engine, often referred to as the engine's "skeleton." It houses the gear system. During engine operation, a major source of noise is low gear meshing precision. Specifically, during the meshing transmission between the driving and driven gears, the resulting excitations (including stiffness excitation, transmission error excitation, and meshing impact excitation) cause periodic vibrations in the gearbox, generating noise that directly impacts engine lifespan. Therefore, before an engine leaves the factory, the meshing precision of its internal gear system must be tested, i.e., the transmission error (TE). TE is the deviation between the actual and ideal transmission of the gears, used to describe the smoothness of gear transmission. Specifically, transmission error refers to the requirement that when the ideal tooth profiles of the driving and driven gears mesh, the driven gear should be driven at a uniform speed by the driving gear. However, due to various reasons such as manufacturing errors, assembly errors, or elastic deformation of the tooth surface under load in meshing gear pairs, the tooth profile of the driving gear needs to rotate an additional angle δ. This allows the tooth profile of the driving gear to move an additional distance along the ideal meshing line before the actual tooth profiles of the driving gear and the driven gear can mesh. This additional distance is the transmission error. Currently, the meshing degree of gear systems inside engines is mostly measured manually by random checks, which has low measurement accuracy and efficiency.

[0024] In view of this, the spur gear backlash measuring device provided in this application, by setting up multiple movable gripper structures for positioning the gear train, allows the gripper structures to be correspondingly set with the transmission shaft of the gear train during testing. One gripper structure's drive shaft drives the driving gear to rotate, while another gripper structure restricts the rotation of the driven gear, thereby achieving rapid measurement of gear meshing degree and effectively improving measurement accuracy and efficiency. To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] Generally speaking, the gear system of the product to be measured usually includes an input shaft, a driving gear, an output shaft, and a driven gear. The input shaft is inserted into the inner hole of the driving gear, the output shaft is inserted into the inner hole of the driven gear, and the driving gear is used to mesh with the driven gear.

[0026] refer to Figure 1 , Figure 1This is a schematic diagram of a spur gear backlash measuring device provided in this application. The spur gear backlash measuring device includes a first drive unit 1, a first limiting unit 2, and an angle encoder (not shown). The first drive unit 1 is positioned opposite the input shaft of the product to be measured 01 and is used to drive the input shaft to rotate forward or backward. The first limiting unit 2 is positioned opposite the output shaft of the product to be measured 01 and is used to limit the rotation of the output shaft. That is, when the first limiting unit 2 limits the rotation of the output shaft, the driven gear meshing with the driving gear remains stationary during the rotation of the driving gear driven by the input shaft. The angle encoder can be connected to the drive shaft 11 and is used to detect the rotation angle of the teeth of the driving gear.

[0027] When specifically configuring the first drive unit 1, such as Figure 2 As shown, Figure 2 For display Figure 1 A schematic diagram of the first limiting part 2 and the first driving part 1 of the provided spur gear backlash measuring device is shown. The first driving part 1 includes a drive shaft 11 and a first gripper 12, and the output end of the drive shaft 11 is connected to the first gripper 12 to drive the first gripper 12 to rotate. During the measurement process, the first gripper 12 is used to connect with the input shaft. For example, the first gripper 12 can be inserted into the shaft hole of the input shaft and tighten the shaft hole of the input shaft, or it can be used to clamp the input shaft to achieve a stable connection between the first gripper 12 and the input shaft, thereby enabling the drive shaft 11 to drive the input shaft and the drive gear to rotate synchronously through the gripper.

[0028] Additionally, the spur gear backlash measuring device may also include a housing 3, and the first drive unit 1 may also include a first servo motor 13, a drive wheel 14, a timing belt 15, and a driven wheel (not shown in the figure). Along the axial direction of the drive shaft 11, the drive shaft 11 passes through the housing 3 and is rotatably connected to the housing 3. For example, the rotatable connection between the drive shaft 11 and the housing 3 is achieved through bearings. The first servo motor 13 is mounted on the housing 3, and its output end is inserted into the connection hole of the drive wheel 14, with a fixed connection achieved through a sleeve. The input end of the drive shaft 11 is fixedly connected to the connection hole of the driven wheel, and the drive wheel 14 is connected to the driven wheel via the timing belt 15. This achieves the function of the first drive unit 1 while improving the compactness of the device.

[0029] When specifically setting the first gripper 12, such as Figure 2 and Figure 3 As shown, Figure 3 For display Figure 2The image shows a partial enlarged view at point A. The first gripper 12 may include a pneumatic chuck 121 and a pneumatic gripper 122. Specifically, the output end of the drive shaft 11 is connected to the pneumatic chuck 121, which has a structure similar to a three-jaw chuck and is driven by a cylinder. The pneumatic gripper 122 is part of the three-jaw chuck. For example, three pneumatic grippers 122 may be provided, and each gripper has an arc-shaped cross-section. The outer walls of the three pneumatic grippers 122 form a cylindrical shape. When the pneumatic grippers 122 are stably connected to the input shaft, they can extend into the shaft hole of the input shaft. The pneumatic chuck 121 drives the three pneumatic grippers 122 to move towards the side wall of the shaft hole, so that the side walls of the three pneumatic grippers 122 press against the hole wall of the shaft hole, thereby achieving the pneumatic grippers 122 tightening the shaft hole, that is, achieving a reliable connection between the gripper and the input shaft.

[0030] In addition, since the cross-section of the pneumatic gripper 122 is arc-shaped and the inner sidewalls of the three pneumatic grippers 122 form a cylindrical shape, the outer sidewall of the input shaft can also be clamped by the inner sidewalls of the three pneumatic grippers 122 to achieve a reliable connection between the gripper and the input shaft and improve the versatility of the device.

[0031] When specifically setting the first limiting part 2, the first limiting part 2 may include a second gripper 21. During the measurement process, the second gripper 21 is used to connect with the output shaft. For example, the second gripper 21 may be inserted into the shaft hole of the output shaft and tighten the shaft hole of the output shaft, or it may be used to clamp the output shaft to achieve a stable connection between the second gripper 21 and the output shaft and limit the rotation of the output shaft. Optionally, the structure of the second gripper 21 can refer to the first gripper 12, which will not be described in detail here.

[0032] Furthermore, the first limiting part 2 is spaced apart from the first driving part 1 along the radial direction of the drive shaft 11, and the first limiting part 2 can rotate circumferentially around the drive shaft 11. The device also includes a displacement sensor, which can be used to detect the moving distance of the first limiting part 2 and the relative distance between the first limiting part 2 and the first driving part 1. Thus, during the circumferential rotation of the first limiting part 2 around the drive shaft 11, the displacement sensor can accurately obtain the moving distance of the first limiting part 2 and the relative distance between the first limiting part 2 and the first driving part 1, thereby achieving rapid positioning and connection of the device with the input and output shafts of the product 01 to be measured, and improving measurement efficiency.

[0033] It is worth mentioning that, such as Figure 3As shown, since the first limiting part 2 and the first driving part 1 are spaced apart along the radial direction of the drive shaft 11, the pneumatic chuck of the second gripper 21 can include two oppositely arranged pneumatic grippers. Therefore, two corresponding pneumatic grippers are also provided, and the cross-sectional shape of the pneumatic grippers is a semi-circular arc. The outer sidewalls of the two pneumatic grippers combine to form a cylinder, and the inner sidewalls also combine to form a cylinder, thereby achieving a stable connection with the output shaft. Alternatively, see further reference. Figure 3 This allows the line A1 connecting the two pneumatic grippers of the second gripper 21 to be parallel to the tangent A2 of the cross section of the cylinder formed by the outer walls of the three pneumatic grippers of the first gripper 12, in order to reduce the space occupied by the two first grippers 12 and the second gripper 21 and improve the compactness of the device.

[0034] Using the spur gear backlash measuring device provided in this application, since the angle encoder is used to detect the rotation angle of the teeth of the driving gear, and the second limiting part 012 is used to limit the rotation of the output shaft, the driven gear is relatively stationary during the rotation of the driving gear. The driving gear is first rotated clockwise, and stops rotating when the sidewall of the teeth of the driving gear abuts against the sidewall of the teeth of the driven gear. Then, the driving gear is rotated counterclockwise, and stops rotating when the sidewall of the teeth of the driving gear abuts against the sidewall of the teeth of the driven gear. During this process, the actual rotation angle of the teeth of the driving gear can be obtained through the angle encoder. Then, by comparing the actual rotation angle of the teeth of the driving gear with the theoretical rotation angle, it can be determined whether the meshing degree of the gear system meets the theoretical range, thereby effectively improving the measurement efficiency and accuracy of the gear system meshing degree.

[0035] It is understandable that, since the first limiting part 2 can rotate circumferentially around the first mounting part, the position of the first limiting part 2 relative to the first driving part can be adjusted to achieve rapid positioning and connection between the device and the input and output shafts of the product to be measured 01, thereby improving measurement efficiency and enabling the spur gear backlash measuring device to meet the position requirements of gear systems of different specifications, which is beneficial to improving the versatility of the spur gear backlash measuring device.

[0036] In one alternative implementation, such as Figure 1 and Figure 2 As shown, the spur gear backlash measuring device may also include a second mounting bracket 4, and is positioned along the axial direction of the drive shaft 11 (e.g., Figure 2 (As shown in the Z-axis direction), the housing 3, which is rotatably connected to the drive shaft 11, is slidably connected to the second mounting bracket 4. Specifically, a linear guide rail can be provided on the mounting bracket, and the linear guide rail extends along the Z-axis direction. The housing 3 is connected to the linear guide rail slide through a connecting block, so that the housing 3 drives the first drive part 1 and the first limit part 2 to move synchronously. This is beneficial to further improve the universality of the device for different models of products 01 to be measured.

[0037] It is worth mentioning that, please refer to the following: Figure 1 and Figure 2 The spur gear backlash measuring device also includes a base structure 5, which extends radially along the drive shaft 11 (e.g., Figure 1 (As shown in the Y-axis direction), the second mounting bracket 4 is slidably connected to the base structure 5. Specifically, the base structure 5 may include intersecting horizontal support bracket 51 and vertical support bracket 52, and a linear guide rail is provided on the vertical support bracket 52, extending along the Y-axis. The second mounting bracket 4 is connected to the vertical support bracket 52 of the base structure 5 via the linear guide rail, so that the second mounting bracket 4 can drive the first driving part 1 and the first limiting part 2 to move synchronously through the housing 3. This is beneficial to further improve the versatility of the device for measuring different models of products 01. In addition, the spur gear backlash measuring device can be equipped with multiple displacement sensors to detect the moving distance of the first limiting part 2 and the first driving part 1 respectively, thereby effectively improving the assembly efficiency and assembly accuracy between the device and the product 01 to be measured.

[0038] It should be noted that this application does not limit the form of the power source used to drive the movement of the second mounting bracket 4 and the housing 3; exemplary examples are also provided. Figure 1 and Figure 4 , Figure 4 For display Figure 2 A schematic diagram along the positive Z-axis. The power source can be either an electric actuator or a cylinder 6. The electric actuator and cylinder body 61 are mounted on the second mounting bracket 4, while the cylinder connector is connected to the housing 3 via a connector seat 62 to drive the housing 3 to move along the Z-axis. Understandably, the power source for the movement of the second mounting bracket 4 along the Y-axis can also be achieved using an electric actuator, which will not be elaborated here.

[0039] In one alternative implementation, such as Figure 2 As shown, the spur gear backlash measuring device may further include a rotary support 7 and a second drive unit 8. The rotary support 7 surrounds the drive shaft 11 along the circumference of the drive shaft 11 and is rotatably connected to the drive shaft 11. The rotary support 7 has a toothed surface on its sidewall away from the drive shaft 11. Specifically, the structure of the rotary support 7 may be similar to that of a spur gear. The drive shaft 11 passes through the gear inner hole of the rotary support 7 axially. There is a gap between the inner wall of the rotary support 7 and the sidewall of the drive shaft 11. The two can be connected by bearings or other structural components.

[0040] Additionally, along the axial direction of the drive shaft 11, the side wall of the rotary support 7 (hereinafter referred to as the bottom wall of the rotary support 7) is connected to the first limiting part 2 via the first connecting structure 9. The side wall of the rotary support 7 can be, for example, a plane perpendicular to the Z-axis, and the first connecting structure 9 can be, for example, a plate structure. Meanwhile, the second drive part 8 is mounted on the housing 3, and the second drive part 8 includes a drive gear 81. The drive gear 81 meshes with the tooth profile of the rotary support 7. Thus, when the drive gear 81 of the drive part rotates, the rotary support 7 can rotate around its own axis. Furthermore, along the radial direction of the drive shaft 11, the first limiting part 2 is spaced apart from the first drive part 1. Simultaneously, the first limiting part 2 is connected to the rotary support 7 via the first connecting structure 9. Therefore, the first limiting part 2 can rotate circumferentially around the drive shaft 11 and the first gripper 12. This allows for adjustment of the relative positions of the first gripper 12 and the second gripper 21 based on the center distance and relative angle of the input and output shafts of the product to be measured 01, while simultaneously simplifying the device structure.

[0041] Understandably, since the first limiting part 2 and the first driving part 1 are spaced apart along the radial direction of the drive shaft 11, and the rotary support 7 surrounds the drive shaft 11 of the first driving part 1, and the bottom wall of the rotary support 7 is connected to the first limiting part 2 through the first connecting structure 9, the first connecting structure 9 will extend a certain length relative to the bottom wall of the rotary support 7 along the radial direction of the drive shaft 11. For example, if it extends along the X-axis direction, then along the Z-axis direction, a portion of the extended portion of the first connecting structure 9 is arranged opposite to the first limiting part 2 to meet the connection requirements between the first limiting part 2 and the first connecting structure 9.

[0042] It should be noted that this application does not limit the specific form of the second drive unit 8. For example, the second drive unit 8 includes a drive spindle, a coupling, a reducer, and a servo motor. The drive spindle is mounted on the side wall of the housing 3 through a bearing seat 82. The servo motor is mounted on the housing 3 and connected to the drive spindle through the reducer and the coupling. The drive spindle is fixedly connected to the gear hole of the drive gear 81. The drive gear 81 extends out of the housing 3 along the Z-axis to meet the meshing requirements with the rotary support 7.

[0043] Continue to refer to Figure 2 Optionally, the spur gear backlash measuring device may further include a first linear guide 10, which is located along the axial direction of the drive shaft 11. The first linear guide 10 is disposed on the side of the first connecting structure 9 facing the first limiting portion 2, and extends radially along the drive shaft 11, for example, along... Figure 2 The first limiting part 2 extends along the X-axis direction, and the first limiting part 2 is slidably connected to the first linear guide rail 10, so that the first limiting part 2 can also move along the X-axis direction. This is beneficial to further improve the assembly efficiency and assembly accuracy between the second gripper 21 and the product 01 to be measured, as well as improve the versatility of the device.

[0044] When specifically setting the first limiting part 2, the options are as follows: (Continue to refer to...) Figure 2 , Figure 3 and Figure 4 The first limiting part 2 may further include a first mounting bracket 22, which is located between the second gripper 21 and the first linear guide rail 10 along the axial direction of the drive shaft. (See also...) Figure 2 and Figure 5 , Figure 5 For display Figure 2 A schematic diagram along the negative Y-axis. The spur gear backlash measuring device may further include a second linear guide 23, which is connected to the second gripper 21 and extends axially along the drive shaft 11. Specifically, an L-shaped fourth connecting structure 24 may be provided, with its vertical portion fixedly connected to the second linear guide 23 and its horizontal portion fixedly connected to the fixing portion of the second gripper 21. Meanwhile, a sliding groove may be provided on the side wall of the first mounting bracket 22, extending axially along the drive shaft 11, and the second linear guide 23 is inserted into the groove to achieve a sliding connection between the second gripper 21 and the first mounting bracket 22 along the Z-axis, thereby further improving the assembly efficiency and accuracy between the second gripper 21 and the product 01 to be measured, as well as enhancing the versatility of the device.

[0045] Understandably, linear guides are equipped with limit structures, such as stop blocks, to improve the reliability of the device. The power source for moving the second gripper 21 along the Z-axis can be an electric actuator; this application does not impose specific limitations.

[0046] In one alternative implementation, such as Figure 5 , Figure 6 and Figure 7 As shown, Figure 6 For display Figure 5 A magnified view of section B in the image; Figure 7 For display Figure 1A partial enlarged view at point C. The first drive unit 1 may further include a second connecting structure 16 and a third linear guide rail 17. The second connecting structure 16 is connected to one end of the drive shaft 11. Specifically, the second connecting structure 16 may be disposed at the end of the drive shaft 11 near the first gripper 12. The second connecting structure 16 may be a plate structure, and the drive shaft 11 may be connected to the second connecting structure 16 by fasteners. The third linear guide rail 17 is disposed on the plate surface of the second connecting structure 16 away from the drive shaft 11 and is connected to the second connecting structure 16 by fasteners. The third linear guide rail 17 extends radially along the drive shaft 11, and the first gripper 12 is slidably connected to the third linear guide rail 17. After the first gripper 12 is stably connected to the input shaft, the first gripper 12 may move along the third linear guide rail 17 to achieve fine adjustment of the position of the first gripper 12, thereby improving the coaxiality of the first gripper 12 and the drive shaft 11 relative to the input shaft and effectively improving the measurement accuracy.

[0047] It is worth mentioning that the first drive unit 1 also includes a third connecting structure 18 and a fourth linear guide rail 19. The third connecting structure 18 is slidably connected to the third linear guide rail 17. Specifically, a slider is provided on the plate surface of the third connecting structure 18 facing the third linear guide rail 17, and is slidably connected to the third linear guide rail 17 through the slider. The fourth linear guide rail 19 is provided on the plate surface of the third connecting structure 18 away from the third linear guide rail 17, and is connected to the connecting structure through fasteners. The projection of the fourth linear guide rail 19 toward the third linear guide rail 17 intersects with the third linear guide rail 17, and the first gripper 12 is slidably connected to the fourth linear guide rail 19. For example, the pneumatic chuck 121 of the first gripper 12 can be slidably connected to the fourth linear guide rail 19 through the mounting plate and the slider provided on the mounting plate. In addition, when specifically setting the third linear guide 17 and the fourth linear guide 19, the third linear guide 17 can optionally extend along the X-axis direction and the fourth linear guide 19 can extend along the Y-axis direction. After the first gripper 12 is stably connected to the input shaft, the first gripper 12 can be finely adjusted by moving it along the third linear guide 17 or along the fourth linear guide 19. This further improves the coaxiality of the first gripper 12 and the drive shaft 11 relative to the input shaft, thereby effectively improving the measurement accuracy.

[0048] It should be noted that, Figures 2 to 6 Only a portion of the structure of the first driving part 1 and the first limiting part 2 is shown, in which, Figure 7 The third linear guide 17 shown in the image and Figure 6 The first slider 101 is slidably connected, and the fourth linear guide rail 19 is slidably connected to the second slider 102.

[0049] like Figure 1 As shown, the spur gear backlash measuring device may also include an installation station 011 and a second limiting part ( Figure 1 (not shown in the image), please refer to the following: Figure 1 , Figure 8 and Figure 9 , Figure 8 For display Figure 1 A partial schematic diagram of the base structure 5 of the provided spur gear backlash measuring device; Figure 9 A structural schematic diagram illustrating the second limiting part 012. The mounting station 011 is used to mount the product 01 to be measured. Based on this, the mounting station 011 can be set on the horizontal support frame 51 of the aforementioned base structure 5. A linear guide rail can be installed on the horizontal support frame 51, and the linear guide rail is along the direction from the mounting station 011 to the first driving part 1 (e.g., ...). Figure 8 Extending along the X-axis (as shown), the product to be measured 01 can be slidably connected to the linear guide rail via the tooling structure to improve the convenience of the device. Furthermore, along the axial direction of the drive shaft 11, the second limiting part 012 is positioned away from the first limiting part 2 relative to the mounting station 011. Simultaneously, the second limiting part 012 includes a third gripper 0121, which is used to insert into and tighten the shaft hole of the output shaft, or to clamp the output shaft.

[0050] It should be noted that since the output shaft and input shaft of the product to be measured 01 can be located on the same side or arranged axially opposite to the input shaft, by making the second limiting part 012 away from the first limiting part 2 relative to the mounting position 011, the versatility of the spur gear backlash measuring device can be effectively improved when the output shaft and input shaft are arranged axially opposite to each other. Furthermore, the structure of the third gripper 0121 can refer to the first gripper 12 or the second gripper 21, and will not be described in detail here.

[0051] It is worth mentioning that the spur gear backlash measuring device also includes a third mounting bracket 013. Along the axial direction of the drive shaft 11, the second limiting part 012 is slidably connected to the third mounting bracket 013. Specifically, a linear guide rail can be set on the third mounting bracket 013, and the guide rail extends along the Z-axis. For products 01 of different specifications to be measured, the second limiting part 012 can be moved to adapt to the position of the shaft system of products of different specifications, thereby effectively improving the versatility of the device.

[0052] In addition, the spur gear backlash measuring device also includes a fifth linear guide rail 014, which is disposed on the base structure 5 and extends radially along the drive shaft 11. The third mounting bracket 013 can be slidably connected to the fifth linear guide rail 014 via a slider to further improve the versatility of the device. Furthermore, the spur gear backlash measuring device may also include a sixth linear guide rail 015 and a connecting structure. The sixth linear guide rail 015 is disposed on the connecting structure and fixedly connected by fasteners. The projection of the sixth linear guide rail 015 toward the fifth linear guide rail 014 intersects with the fifth linear guide rail 014. For example, the fifth linear guide rail 014 can extend along the X-axis, and the sixth linear guide rail 015 can extend along the Y-axis to further improve the versatility of the device.

[0053] In one alternative implementation, such as Figure 1 As shown, the spur gear backlash measuring device also includes a tensioning structure 016. When the gripper cannot directly extend into the shaft hole of the input shaft or the shaft hole of the output shaft, or cannot directly clamp the side wall of the input shaft or the side wall of the output shaft, the tensioning structure 016 can be inserted into the shaft hole of the input shaft or the shaft hole of the output shaft, and the shaft hole is tightened to achieve a stable connection with the input shaft or the output shaft. For example, the robot can pre-complete the insertion of the tensioning structure 016 into the shaft hole. Furthermore, the tensioning structure 016 is provided with a coaxial column structure along the axial direction of the input shaft or the output shaft, and the column structure is provided with a mounting hole. The gripper can achieve a stable connection with the input shaft or the output shaft by tightening the mounting hole or clamping the side wall of the column structure, thereby expanding the applicability of the device. In addition, the spur gear backlash measuring device provided in this application also includes a cable chain to improve the ease of cable installation.

[0054] Having understood the structure of the spur gear backlash measuring device provided in this application, the device will now be further described in conjunction with the measurement process: First, power on the equipment, adjust the equipment to the preset mode, and determine whether the product to be measured 01 is located at the installation station 011 by the photoelectric switch set at the installation station 011; if it is in place, the clamping cylinder 6 clamps the tooling used to install the product to be measured 01. Next, the tooling is slid along the slide rail to the bottom of the first drive unit 1, and the positions of the first drive unit 1 and the first limiting unit 2 are adjusted. First, the drive shaft 11 of the gripper of the first drive unit 1 is connected to the corresponding input shaft. At this time, the first limiting unit 2 is separated from the output shaft. Then, the drive shaft 11 of the first drive unit 1 drives the input shaft to rotate 360 ​​degrees forward and 360 degrees in reverse to fully mesh the drive gear and the driven gear; Afterwards, the gripper of the first limiting part 2 rises or falls and connects to the output shaft, causing the drive shaft 11 to drive the input shaft forward / reverse to measure the meshing clearance between the driving gear and the driven gear. Afterwards, the grippers of the first drive unit 1 and the first limit unit 2 are separated from the input shaft and the output shaft, and the meshing clearance after the drive gear rotates 90°, 180° and 270° is measured and the average value is taken; in addition, this method can also directly screen out gears with damaged teeth.

[0055] In summary, by using the spur gear backlash measuring device provided in this application, during the circumferential rotation of the first limiting part 2 around the first mounting part, the displacement sensor can accurately obtain the moving distance of the first limiting part 2 and the relative distance between the first limiting part 2 and the first driving part 1, so as to achieve rapid positioning and connection of the input shaft and output shaft of the product 01 to be measured. Furthermore, since the angle encoder is used to detect the rotation angle of the teeth of the driving gear, and the second limiting part 012 is used to limit the rotation of the output shaft, the driven gear is relatively stationary during the rotation of the driving gear. Therefore, the driving gear is first rotated clockwise, and when the side wall of the teeth of the driving gear abuts against the side wall of the teeth of the driven gear, the driving gear stops rotating. Then, the driving gear is rotated counterclockwise, and when the side wall of the teeth of the driving gear abuts against the side wall of the teeth of the driven gear, the driving gear stops rotating. During this process, the actual rotation angle of the teeth of the driving gear can be obtained through the angle encoder. Then, by comparing the actual rotation angle of the teeth of the driving gear with the theoretical rotation angle, it can be determined whether the meshing degree of the gear system meets the theoretical range, thereby effectively improving the measurement efficiency and measurement accuracy of the meshing degree of the gear system.

[0056] Understandably, since the first limiting part 2 rotates circumferentially around the first mounting part, the position of the first limiting part 2 relative to the first driving part 1 can be adjusted to achieve rapid positioning and connection of the input and output shafts of the product to be measured, thereby improving measurement efficiency. Simultaneously, it allows the spur gear backlash measuring device to meet the positional requirements of gear systems of different specifications, which is beneficial to improving the versatility of the spur gear backlash measuring device.

[0057] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A spur gear backlash measuring device, wherein the product to be measured includes an input shaft, a driving gear, an output shaft, and a driven gear, the input shaft being inserted into the inner hole of the driving gear, the output shaft being inserted into the inner hole of the driven gear, and the driving gear being used to mesh with the driven gear; characterized in that, The spur gear backlash measuring device includes a first drive unit, a first limiting unit, and an angle encoder, wherein: The first drive unit includes a drive shaft and a first gripper, the output end of the drive shaft being connected to the first gripper; the first gripper is used to connect to the input shaft; Along the radial direction of the drive shaft, the first limiting part is spaced apart from the first driving part; the first limiting part can rotate circumferentially around the drive shaft. The first limiting part includes a second gripper, which is used to connect to the output shaft; The angle encoder is used to detect the rotation angle of the teeth of the drive gear.

2. The spur gear backlash measuring device according to claim 1, characterized in that, The spur gear backlash measuring device also includes a housing, with the drive shaft passing through the housing along the axial direction of the drive shaft and being rotatably connected to the housing.

3. The spur gear backlash measuring device according to claim 2, characterized in that, The spur gear backlash measuring device further includes a second drive unit and a rotary support, wherein the second drive unit is mounted on the housing; Along the circumference of the drive shaft, the rotary support surrounds the drive shaft and is rotatably connected to the drive shaft; The slewing support has a toothed surface on its sidewall facing away from the drive shaft. The second drive unit includes a drive gear, which meshes with the tooth profile of the rotary support; Along the axial direction of the drive shaft, the sidewall of the rotary support is connected to the first limiting part through a first connecting structure.

4. The spur gear backlash measuring device according to claim 3, characterized in that, The spur gear backlash measuring device further includes a first linear guide rail, which is disposed on the side of the first connecting structure facing the first limiting part along the axial direction of the drive shaft and extends radially along the drive shaft. The first limiting part is slidably connected to the first linear guide rail.

5. The spur gear backlash measuring device according to claim 4, characterized in that, The first limiting part further includes a first mounting bracket and a second linear guide rail. Along the axial direction of the drive shaft, the first mounting bracket is located between the second gripper and the first linear guide rail. The second linear guide is connected to the second gripper and extends along the axial direction of the drive shaft; along the axial direction of the drive shaft, the second gripper is slidably connected to the first mounting bracket via the second linear guide.

6. The spur gear backlash measuring device according to claim 2, characterized in that, The spur gear backlash measuring device also includes a base structure and a second mounting bracket, which are slidably connected to the base structure along the radial direction of the drive shaft. Along the axial direction of the drive shaft, the housing is slidably connected to the second mounting bracket.

7. The spur gear backlash measuring device according to any one of claims 1 to 6, characterized in that, The first drive unit further includes a second connecting structure and a third linear guide rail. The second connecting structure is connected to one end of the drive shaft, and the third linear guide rail is disposed on the plate surface of the second connecting structure opposite to the drive shaft and extends radially along the drive shaft. The first gripper is slidably connected to the third linear guide rail.

8. The spur gear backlash measuring device according to claim 7, characterized in that, The first driving unit further includes a third connecting structure and a fourth linear guide rail. The third connecting structure is slidably connected to the third linear guide rail. The fourth linear guide rail is disposed on the plate surface of the third connecting structure that is away from the third linear guide rail, and its projection toward the third linear guide rail intersects with the third linear guide rail. The first gripper is slidably connected to the fourth linear guide rail.

9. The spur gear backlash measuring device according to claim 1, characterized in that, The spur gear backlash measuring device further includes an installation station and a second limiting part. The installation station is used to install the product to be measured. Along the axial direction of the drive shaft, the second limiting part is opposite to the first limiting part relative to the installation station. The second limiting part includes a third gripper, which is used to connect with the output shaft.

10. The spur gear backlash measuring device according to claim 9, characterized in that, The spur gear backlash measuring device further includes a base structure, a fifth linear guide rail, and a third mounting bracket. The fifth linear guide rail is disposed on the base structure and extends radially along the drive shaft. The third mounting bracket is slidably connected to the fifth linear guide rail. Along the axial direction of the drive shaft, the second limiting portion is slidably connected to the third mounting bracket.

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