Gear backlash measuring instrument

Abstract

The utility model provides a gear backlash measuring instrument, and relates to the technical field of part detection. The first mounting seat is fixedly arranged on the base, and a first through hole is formed in the surface of the first mounting seat; the axis of the rotating shaft is parallel to the long edge of the base, the rotating shaft penetrates through the first through hole and is rotationally connected with the first mounting base, the first end of the rotating shaft is connected with a wrench connector used for being matched with a torque wrench, and the second end of the rotating shaft is connected with a preset inner gear; the second mounting seat is movably connected with the base along the long side of the base, the first end of the upper part of the second mounting seat is fixedly connected with the external gear to be measured, and the axis of the external gear to be measured coincides with the axis of the preset internal gear; and the angle meter is mounted on the rotating shaft and is close to the first end of the rotating shaft. According to the scheme of the utility model, the angle reading is obtained by locking the rotating shaft, and the problem of low accuracy of gear backlash measurement is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to part detection technical field, especially a gear backlash measuring instrument. BACKGROUND

[0002] Gear backlash, that is, the gap between tooth surfaces when gears mesh, reasonable gear backlash is crucial for the smooth operation of gears, when gear backlash is too large, gears will produce greater impact force in the meshing process, thereby causing a significant increase in noise level; Excessive backlash will reduce the alignment accuracy of gear transmission, may cause mutations and jolts in transmission, damage the stable operation of equipment, cause greater relative displacement of gears when meshing, thereby exacerbating the vibration of the entire system, and too small backlash may cause excessive friction and heat of gears when meshing, which will also damage the gears.

[0003] Most of the existing technology for measuring gear backlash uses lead pressing method, the specific operation mode is to place lead wire in the gear backlash, the diameter of the lead wire should be less than or equal to the minimum value of the backlash, so that the gears mesh and roll, and the thickness of the flattened lead wire is equivalent to the value of the backlash, but the measurement result of the lead pressing method largely depends on the skills and experience of the operator, for example, the placement position, quantity, size of the lead wire and the accuracy of the reading during the measurement process may all affect the measurement result, therefore, there is an urgent need for a gear backlash measuring instrument that is simple to operate and accurate in measurement result, to solve the problem of low accuracy of gear backlash measurement. UTILITY MODEL CONTENTS

[0004] The utility model provides a gear backlash measuring instrument, aims at solving the problem of low accuracy of gear backlash measurement.

[0005] To solve the above technical problems, the technical scheme of the utility model is as follows:

[0006] The utility model provides a gear backlash measuring instrument, comprising:

[0007] A base;

[0008] A first mounting seat is fixedly arranged on the base, and a first through hole is arranged on the surface of the first mounting seat;

[0009] A rotating shaft is rotatably connected with the first mounting seat through the first through hole, a wrench joint for cooperating with a torque wrench is connected to the first end of the rotating shaft, and a preset internal gear is connected to the second end of the rotating shaft;

[0010] An adjustable second mounting base is slidably connected to the base to move closer to or further away from the first mounting base. The upper part of the second mounting base is provided with a mounting shaft, which corresponds to and is coaxially arranged with the preset internal gear. The end of the mounting shaft near the preset internal gear is detachably connected to the external gear to be tested, and the external gear to be tested meshes with the preset internal gear.

[0011] An angle gauge is mounted on the rotating shaft, with the angle gauge located near the first end of the rotating shaft.

[0012] Optionally, the second mounting base includes:

[0013] A vertically installed second column;

[0014] The first column is slidably disposed inside the second column, and the mounting shaft is connected to the first column;

[0015] The second column has a first threaded hole on its outer side, and a positioning bolt is threaded into the first threaded hole. The positioning bolt abuts against the first column.

[0016] Optionally, the mounting shaft includes:

[0017] A second slider connected to the first column has a threaded blind hole on its first end surface;

[0018] A first slider, the first end of which is fixedly connected to the external gear to be tested;

[0019] A second through hole is formed inside the first slider, and the second through hole is adjacent to the threaded blind hole and their axes coincide;

[0020] The connecting bolt passes sequentially through the center hole and the second through hole of the external gear to be tested, and the connecting bolt is threadedly connected to the threaded blind hole.

[0021] Optional, also includes:

[0022] A housing, which is inserted into the first through hole;

[0023] The housing has openings at both ends, the rotating shaft is rotatably mounted inside the housing via bearings, the first end of the rotating shaft extends out of the housing, and the preset internal gear is rotatably connected to the inner cavity of the housing via bearings;

[0024] The axes of the housing, the external gear to be tested, and the preset internal gear all coincide.

[0025] Optionally, a flange is formed on the outer side of the housing, and the flange is fixedly connected to the first mounting base by bolts and nuts.

[0026] Optional, also includes:

[0027] Angle gauge mounting base,

[0028] The angle gauge mounting base is disposed on the rotating shaft, and the angle gauge mounting base is located between the shaft head and the first mounting base;

[0029] The angle gauge is mounted on the angle gauge mounting base.

[0030] Optionally, the angle gauge mounting base includes:

[0031] First arc-shaped sleeve and second arc-shaped sleeve;

[0032] The first arc-shaped sleeve and the second arc-shaped sleeve are sleeved and connected to the surface of the rotating shaft. The first arc-shaped sleeve is disposed above the second arc-shaped sleeve, and the top surface of the first arc-shaped sleeve is formed with an installation platform.

[0033] The angle gauge is mounted on the mounting platform on the top surface of the first arc-shaped sleeve.

[0034] Optional, also includes:

[0035] A slide rail is provided on the upper surface of the base, the slide rail extends toward the first mounting seat, and the bottom surface of the second column is slidably connected to the slide rail.

[0036] Optional, also includes:

[0037] Rotate the lead screw mounted above the base, the lead screw being parallel to the slide rail;

[0038] A third through hole is provided at the bottom of the first mounting base;

[0039] A lead screw thread hole is provided through the bottom of the second column;

[0040] The third through hole coincides with the axis of the lead screw thread hole;

[0041] The first end of the rotating lead screw passes through the third through hole, and the rotating lead screw is threadedly connected to the lead screw thread hole.

[0042] Optional, also includes:

[0043] A drive device is fixedly mounted on the base, and the output end of the drive device is connected to the second end of the rotating lead screw.

[0044] The above-described solution of this utility model has at least the following beneficial effects:

[0045] The base of this invention supports the first mounting seat and the second mounting seat. The first mounting seat supports and positions the rotating shaft, and the second mounting seat supports and positions the mounting shaft. The arrangement of the first and second mounting seats ensures that the axes of the preset internal gear and the external gear to be tested coincide, thereby ensuring that the preset internal gear and the external gear to be tested can mesh smoothly and improving the stability of the device operation. The rotating shaft passes through the first through hole and is rotatably connected to the first mounting seat to restrict the degree of freedom of the rotating shaft except for rotation around the axis. The second mounting seat is slidably connected to the base so that the mounting shaft can move synchronously with the second mounting seat when it moves closer to or away from the first mounting seat, thereby restricting the rotation of the external gear to be tested and controlling the external gear to be tested to enter or disengage from the meshing state, improving the flexibility of the device operation. The angle gauge is installed on the rotating shaft. When the rotating shaft starts to rotate, the angle gauge moves synchronously with the rotating shaft to obtain the offset angle of the rotating shaft. This invention obtains the angle reading by locking the rotating shaft, solving the problem of low accuracy in gear backlash measurement. Attached Figure Description

[0046] Figure 1 This is a vertical sectional view of the main view of this utility model;

[0047] Figure 2 This is the left view of this utility model;

[0048] Figure 3 This is a vertical sectional view of the first slider of this utility model;

[0049] Figure 4 This is a vertical sectional view of the second mounting base of this utility model;

[0050] Figure 5 This is a vertical sectional view of the base of this utility model.

[0051] Explanation of reference numerals in the attached figures:

[0052] 1. Base; 11. Slide rail; 2. First mounting seat; 21. First through hole; 22. Third through hole; 3. Second mounting seat; 31. First column; 311. Connecting bolt; 32. Second column; 321. First threaded hole; 322. Lead screw threaded hole; 33. Mounting shaft; 331. First slider; 3311. External gear to be measured; 3312. Second through hole; 332. Second slider; 3321. Threaded blind hole; 4. Housing; 5. Rotating shaft; 51. Shaft head; 511. Wrench connector; 52. Preset internal gear; 6. Rotating lead screw; 7. Drive device; 8. Flange; 9. Angle gauge mounting seat; 91. First arc sleeve; 92. Second arc sleeve; 10. Angle gauge. Detailed Implementation

[0053] Exemplary embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0054] like Figure 1 As shown, an embodiment of this utility model provides a gear backlash measuring instrument, comprising:

[0055] Base 1;

[0056] First mounting base 2, the first mounting base 2 is fixedly disposed on the base 1, and the surface of the first mounting base 2 is provided with a first through hole 21;

[0057] A rotating shaft 5 passes through the first through hole 21 and is rotatably connected to the first mounting base 2. The first end of the rotating shaft 5 is connected to a wrench connector 511 for cooperating with a torque wrench, and the second end of the rotating shaft 5 is connected to a preset internal gear 52.

[0058] A second mounting base 3 with adjustable position is slidably connected to the base 1 to be close to or away from the first mounting base 2. The upper part of the second mounting base 3 is provided with a mounting shaft 33, which corresponds to and is coaxially arranged with the preset internal gear 52. The end of the mounting shaft 33 near the preset internal gear 52 is detachably connected to the external gear 3311 to be tested, and the external gear 3311 to be tested meshes with the preset internal gear 52.

[0059] An angle gauge 10 is mounted on the rotating shaft 5, and the angle gauge 10 is located near the first end of the rotating shaft 5.

[0060] In this embodiment, when measuring gear backlash, the rotating shaft 5 passes through the first through hole 21 and is rotatably connected to the first mounting base 2. The rotating shaft 5 is in a state of force balance and remains stationary. Applying a tangential external force to the rotating shaft 5 can make the rotating shaft 5 overcome its own resistance and rotate around the axis. The wrench connector 511 is used to provide a force application point for the torque wrench. With the torque wrench, the preset torque that needs to be applied when the rotating shaft 5 is idling can be obtained.

[0061] The external gear 3311 to be tested is installed on the end of the mounting shaft 33 near the preset internal gear 52. The mounting shaft 33 is then fixedly installed on the upper part of the second mounting seat 3, keeping the axis of the mounting shaft 33 and the preset internal gear 52 coincident. The position of the second mounting seat 3 is adjusted, and the second mounting seat 3 is slid closer to the first mounting seat 2. The external gear 3311 to be tested, installed on the mounting shaft 33, gradually approaches the preset internal gear 52 set at the second end of the rotating shaft 5. When the preset internal gear 52 and the external gear 3311 to be tested mesh, since the external gear 3311 to be tested cannot rotate, the teeth of the external gear 3311 to be tested will apply additional resistance to the rotating shaft 5. When the torque applied by the torque wrench reaches the preset torque, it can be determined that the teeth are in a meshing state.

[0062] Place the base 1 in a flat position, install the angle gauge 10 on the rotating shaft 5 and calibrate the angle gauge 10 to zero. Rotate the torque wrench clockwise to the rated torque, and then return the angle gauge 10 to zero again. Subsequently, rotate the torque wrench counterclockwise to the rated torque and record the reading of the angle gauge 10 at this time as the measurement result. The rated torque is a different value depending on the specification or material of the external gear to be measured. Finally, select the corresponding tolerance range and subtract the offset tolerance from the measurement result to obtain the final result.

[0063] The base 1 is used to support the first mounting seat 2 and the second mounting seat 3. The first mounting seat 2 is used to support and position the rotating shaft 5, and the second mounting seat 3 is used to support and position the mounting shaft 33. The arrangement of the first mounting seat 2 and the second mounting seat 3 ensures that the axes of the preset internal gear 52 and the external gear 3311 to be tested coincide, thereby ensuring that the preset internal gear 52 and the external gear 3311 to be tested can mesh smoothly, and improving the stability of the device operation.

[0064] The rotating shaft 5 passes through the first through hole 21 and is rotatably connected to the first mounting base 2 to restrict the degree of freedom of the rotating shaft 5 except for rotation around the axis. The second mounting base 3 is slidably connected to the base 1 so that the mounting shaft 33 can move synchronously with the second mounting base 3 to restrict the rotation of the external gear 3311 under test, and at the same time control the external gear 3311 under test to enter or disengage from the meshing state, thereby improving the flexibility of the device operation.

[0065] The angle gauge 10 is mounted on the rotating shaft 5. When the rotating shaft 5 starts to rotate, the angle gauge 10 moves synchronously with the rotating shaft 5 to obtain the offset angle of the rotating shaft 5.

[0066] The present invention solves the problem of low accuracy in gear backlash measurement by obtaining angle readings through locking the rotating shaft 5.

[0067] like Figure 1 , Figure 3 As shown, in an optional embodiment of the present invention, the second mounting base 3 includes:

[0068] The second vertical column 32;

[0069] The first column 31 is slidably disposed inside the second column 32, and the mounting shaft 33 is connected to the first column 31;

[0070] The second column 32 has a first threaded hole 321 on its outer side, and a positioning bolt is threaded inside the first threaded hole 321. The positioning bolt abuts against the first column 31.

[0071] In this embodiment, the first column 31 is slidably disposed inside the second column 32 to adjust the height of the second mounting base 3, thereby adjusting the axial height of the external gear 3311 to be tested. When the axes of the preset internal gear 52 and the external gear 3311 to be tested coincide, the positioning bolt is tightened to abut against the first column 31 to keep the height of the second mounting base 3 constant. This utility model can adjust the axial height of the external gear 3311 to be tested, ensuring that the preset internal gear 52 and the external gear 3311 to be tested are fully meshed, further improving the accuracy of gear backlash measurement.

[0072] like Figure 1 , Figure 3 and Figure 4 As shown, in an optional embodiment of the present invention, the mounting shaft 33 includes:

[0073] A second slider 332 connected to the first column 31 has a threaded blind hole 3321 on its first end surface;

[0074] The first slider 331, the first end of the first slider 331 is fixedly connected to the external gear 3311 to be tested;

[0075] A second through hole 3312 is formed inside the first slider 331. The second through hole 3312 is adjacent to the threaded blind hole 3321 and their axes coincide.

[0076] The connecting bolt 311 passes through the center hole of the external gear 3311 to be tested and the second through hole 3312 in sequence, and the connecting bolt 311 is threadedly connected to the threaded blind hole 3321.

[0077] In this embodiment, when installing the external gear 3311 to be tested, the second mounting base 3 is slid away from the first mounting base 2 until the first slider 331 is completely disengaged. The connecting bolt 311 is loosened, the first slider 331 and the current external gear 3311 to be tested are removed, and the other external gears 3311 to be tested are placed at the end of the first slider 331. The end of the connecting bolt 311 passes through the center hole and the second through hole 3312 of the external gear 3311 to be tested in sequence, so that the first slider 331 and the second slider 332 are connected. The connecting bolt 311 is screwed into the threaded blind hole 3321 until the connection between the first slider 331 and the second slider 332 and the clamping and fixing of the external gear 3311 to be tested are completed. The second mounting base 3 is slid close to the first mounting base 2 to re-mesh the external gear 3311 to be tested with the preset internal gear 52, thereby performing measurements cyclically.

[0078] The mounting shaft 33 adopts a split structure, wherein the first slider 331 is used to connect the external gear 3311 to be measured. In actual measurement work, the external gear 3311 to be measured needs to be replaced frequently. The replacement operation is carried out directly on the second mounting base 3. On the one hand, the working space is limited and it is not convenient to repeatedly disassemble and assemble. On the other hand, stress cannot be avoided during disassembly and assembly, which may affect the height of the second mounting base 3 after debugging, thereby affecting the accuracy of the measurement data.

[0079] The first end surface of the second slider 332 has a threaded blind hole 3321 for fastening the external gear 3311 to be tested by the connecting bolt 311, thereby restricting the rotational movement of the external gear 3311 to be tested and improving the reliability of the equipment.

[0080] like Figure 1 , Figure 2 As shown, in an optional embodiment of the present invention, it further includes:

[0081] Housing 4, which is inserted into the first through hole 21;

[0082] The housing 4 is open at both ends, the rotating shaft 5 is rotatably mounted inside the housing 4 via bearings, the first end of the rotating shaft 5 extends out of the housing 4, and the preset internal gear 52 is rotatably connected to the inner cavity of the housing 4 via bearings;

[0083] The axes of the housing 4, the external gear 3311 to be tested, and the preset internal gear 52 all coincide.

[0084] In this embodiment, the housing 4 provides a sealed space for the meshing of the preset internal gear 52 and the external gear 3311 to be tested, preventing interference from the external environment and improving the accuracy of gear backlash measurement.

[0085] In addition, the axes of the housing 4, the external gear 3311 to be tested, and the preset internal gear 52 are all coincident, which can further assist the axis of the preset internal gear 52 and the external gear 3311 to be tested to be coincident, thereby further improving the accuracy of gear backlash measurement.

[0086] like Figure 1 , Figure 2 As shown, in an optional embodiment of the present invention, a flange 8 is formed on the outer side of the housing 4, and the flange 8 is fixedly connected to the first mounting base 2 by bolts and nuts.

[0087] In this embodiment, a flange 8 is formed on the outer side of the housing 4. The flange 8 has strong connection stability, high reliability, good sealing performance, convenient installation and maintenance, simple and quick operation, and is easy to inspect and replace parts.

[0088] like Figure 1 , Figure 2 As shown, in an optional embodiment of the present invention, it further includes:

[0089] Angle gauge mounting base 9,

[0090] The angle gauge mounting base 9 is disposed on the rotating shaft 5, and the angle gauge mounting base 9 is located between the shaft head 51 and the first mounting base 2;

[0091] The angle gauge 10 is mounted on the angle gauge mounting base 9.

[0092] In this embodiment, the angle gauge mounting base 9 is disposed on the rotating shaft 5, and the angle gauge 10 is mounted on the angle gauge mounting base 9, so that the angle gauge mounting base 9 rotates synchronously with the rotating shaft 5, thereby driving the angle gauge 10 to rotate synchronously with the angle gauge mounting base 9, thus ensuring the accuracy of the measurement data. The angle gauge mounting base 9 is located between the shaft head 51 and the first mounting base 2, and its purpose is to place the angle gauge mounting base 9 outside the cavity of the housing 4, so as to compress the internal space of the cavity of the housing 4, and to ensure that the housing 4 and the rotating shaft 5 avoid connection gaps, thereby reducing working errors.

[0093] like Figure 2 As shown, in an optional embodiment of this utility model, the angle gauge mounting base 9 includes:

[0094] First arc-shaped sleeve 91 and second arc-shaped sleeve 92;

[0095] The first arc-shaped sleeve 91 and the second arc-shaped sleeve 92 are sleeved and connected to the surface of the rotating shaft 5. The first arc-shaped sleeve 91 is disposed above the second arc-shaped sleeve 92, and the top surface of the first arc-shaped sleeve 91 is formed with an installation platform.

[0096] The angle gauge 10 is mounted on the mounting platform on the top surface of the first arc-shaped sleeve 91.

[0097] In this embodiment, the arcuate surfaces of the first arcuate sleeve 91 and the second arcuate sleeve 92 are designed according to the shaft diameter of the rotating shaft 5, so that the first arcuate sleeve 91 and the second arcuate sleeve 92 fit tightly against the rotating shaft 5. The top surface of the first arcuate sleeve 91 is formed with a mounting platform to provide mounting space for the angle gauge 10. At the same time, the upper surface of the mounting platform is horizontal, which makes it easier to zero the angle gauge 10 and measure data.

[0098] like Figure 1 , Figure 5 As shown, in an optional embodiment of the present invention, it further includes:

[0099] A slide rail 11 is provided on the upper surface of the base 1, the slide rail 11 extends toward the first mounting seat 2, and the bottom surface of the second column 32 is slidably connected to the slide rail 11.

[0100] In this embodiment, the slide rail 11 provides motion guidance for the movement direction of the second column 32 to prevent the movement path from deviating, while reducing the relative friction between the second column 32 and the upper surface of the base 1, thus increasing its service life.

[0101] like Figure 1 , Figure 5 As shown, in an optional embodiment of the present invention, it further includes:

[0102] Rotate the lead screw 6 mounted above the base 1, the lead screw 6 being parallel to the slide rail 11;

[0103] A third through hole 22 is provided through the bottom of the first mounting base 2;

[0104] The bottom of the second column 32 is provided with a lead screw thread hole 322;

[0105] The third through hole 22 coincides with the axis of the lead screw thread hole 322;

[0106] The first end of the rotating lead screw 6 passes through the third through hole 22, and the rotating lead screw 6 is threadedly connected to the lead screw thread hole 322.

[0107] In this embodiment, the external gear 3311 to be tested is installed on the end of the first slider 331 near the preset internal gear 52. Then, the connecting bolt 311 passes through the center hole of the external gear 3311 and the second through hole 3312 in sequence, and the connecting bolt 311 is threadedly connected to the threaded blind hole 3321 to keep the axis of the external gear 3311 to be tested and the preset internal gear 52 coincident. The rotating screw 6 is rotated to make the second mounting seat 3 slide close to the first mounting seat 2. Every time the rotating screw 6 rotates, the screw thread hole 322 will drive the second mounting seat 3 to move precisely a preset distance until the preset internal gear 52 and the external gear 3311 to be tested mesh.

[0108] The rotating lead screw 6 is used to convert rotary motion into linear motion with high conversion efficiency. A threaded hole 322 is provided through the bottom of the second column 32, and a third through hole 22 is provided through the bottom of the first mounting base 2. This ensures that when the rotating lead screw 6 rotates, it only drives the second column 32 to move horizontally without affecting the working state of the first mounting base 2. The rotating lead screw 6 has high positioning accuracy, accurately controlling the moving distance of the second column 32. The rotating lead screw 6 transmission can withstand large loads, has relatively stable motion characteristics, and can ensure the stability of the machining process. Moreover, the structure of the lead screw transmission is relatively simple, easy to maintain and adjust.

[0109] like Figure 1 , Figure 5 As shown, an optional embodiment of this utility model further includes:

[0110] A drive device 7 is fixedly mounted on the base 1, and the output end of the drive device 7 is connected to the second end of the rotating lead screw 6.

[0111] In this embodiment, the driving device 7 can be a device such as a geared motor that can drive the rotating lead screw 6 to rotate. The driving device 7 converts electrical energy into mechanical energy to provide power to rotate the rotating lead screw 6. The driving device 7 has stable performance, high reliability, and good flexibility. By replacing the manual rotary wheel with the driving device 7, automated measurement is achieved, reducing costs and improving efficiency.

[0112] The embodiment of this utility model provides a gear backlash measuring instrument, the specific operation process of which is as follows: the rotating shaft 5 passes through the first through hole 21 and is rotatably connected to the first mounting base 2; the housing 4 is inserted into the first through hole 21; the housing 4 has openings at both ends; the rotating shaft 5 is rotatably mounted in the housing 4 through bearings; the first end of the rotating shaft 5 protrudes from the housing 4; the preset internal gear 52 is rotatably connected to the inner cavity of the housing 4 through bearings; the rotating shaft 5 is in a state of force balance and remains stationary; applying a tangential external force to the rotating shaft 5 can make the rotating shaft 5 overcome its own resistance and rotate around the axis; the wrench connector 511 is used to provide a force application point for the torque wrench; with the torque wrench, the preset torque that needs to be applied when the rotating shaft 5 is idling can be obtained.

[0113] Adjust the sliding position of the first column 31 inside the second column 32, thereby adjusting the axial height of the external gear 3311 to be tested. When the axes of the preset internal gear 52 and the external gear 3311 to be tested coincide, since the axes of the housing 4, the external gear 3311 to be tested, and the preset internal gear 52 all coincide, the position of the external gear 3311 to be tested corresponds to the opening at the second end of the housing 4. At this time, tighten the positioning bolt to abut against the first column 31 to keep the height of the second mounting base 3 constant.

[0114] The external gear 3311 to be tested is installed on the end of the first slider 331 near the preset internal gear 52. Then, the connecting bolt 311 passes through the center hole of the external gear 3311 and the second through hole 3312 in sequence, and the connecting bolt 311 is threadedly connected to the threaded blind hole 3321 to keep the axis of the external gear 3311 to be tested and the preset internal gear 52 coincident. The rotating screw 6 is rotated to make the second mounting seat 3 slide close to the first mounting seat 2. Every time the rotating screw 6 rotates, the screw thread hole 322 will drive the second mounting seat 3 to move precisely a preset distance until the preset internal gear 52 and the external gear 3311 to be tested mesh. When the preset internal gear 52 and the external gear 3311 to be tested mesh, since the external gear 3311 to be tested cannot rotate, the teeth of the external gear 3311 to be tested will apply additional resistance to the rotating shaft 5. When the torque applied by the torque wrench reaches the preset torque, it can be determined that the teeth are in a meshing state.

[0115] Place the base 1 in a flat position, install the angle gauge 10 on the rotating shaft 5 and calibrate the angle gauge 10 to zero. Rotate the torque wrench clockwise to the rated torque, and then return the angle gauge 10 to zero again. Subsequently, rotate the torque wrench counterclockwise to the rated torque and record the reading of the angle gauge 10 at this time as the measurement result. The rated torque is a different value depending on the specification or material of the external gear to be measured. Finally, select the corresponding tolerance range and subtract the offset tolerance from the measurement result to obtain the final result.

[0116] Rotate the lead screw 6 in the opposite direction to move the second mounting seat 3 away from and closer to the first mounting seat 2. Slide the second mounting seat 3 away from the first mounting seat 2 until the first slider 331 is completely disengaged. Loosen the connecting bolt 311, remove the first slider 331 and the current external gear 3311 to be tested, replace it with another external gear 3311 to be tested and reinstall it on the second slider 332, then tighten it with the connecting bolt 311. Slide the second mounting seat 3 closer to the first mounting seat 2 to re-mesh the external gear 3311 to be tested with the preset internal gear 52, thereby repeating the measurement cycle.

[0117] The present invention provides a gear backlash measuring instrument that obtains an angle reading by locking the rotating shaft 5, thereby solving the problem of low accuracy in gear backlash measurement.

[0118] The above are preferred embodiments of this utility model. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A gear backlash measuring instrument, characterized in that, include: Base (1); The first mounting base (2) is fixedly mounted on the base (1), and the surface of the first mounting base (2) is provided with a first through hole (21); A rotating shaft (5) passes through the first through hole (21) and is rotatably connected to the first mounting base (2). The first end of the rotating shaft (5) is connected to a wrench connector (511) for use with a torque wrench, and the second end of the rotating shaft (5) is connected to a preset internal gear (52). A second mounting base (3) with adjustable position is slidably connected to the base (1) to be close to or away from the first mounting base (2). The upper part of the second mounting base (3) is provided with a mounting shaft (33). The mounting shaft (33) corresponds to and is coaxially arranged with the preset internal gear (52). The end of the mounting shaft (33) near the preset internal gear (52) is detachably connected to the external gear (3311) to be tested. The external gear (3311) to be tested meshes with the preset internal gear (52). An angle gauge (10) is mounted on the rotating shaft (5) and the angle gauge (10) is located near the first end of the rotating shaft (5).

2. The gear backlash measuring instrument according to claim 1, characterized in that, The second mounting base (3) includes: A vertically installed second column (32); The first column (31) is slidably disposed inside the second column (32), and the mounting shaft (33) is connected to the first column (31); The second column (32) has a first threaded hole (321) on its outer side, and a positioning bolt is threaded inside the first threaded hole (321), which abuts against the first column (31).

3. The gear backlash measuring instrument according to claim 2, characterized in that, The mounting shaft (33) includes: A second slider (332) is connected to the first column (31), and a threaded blind hole (3321) is opened on the first end surface of the second slider (332); The first slider (331) has its first end fixedly connected to the external gear (3311) to be tested; A second through hole (3312) is formed inside the first slider (331), and the second through hole (3312) is arranged adjacent to the threaded blind hole (3321) and their axes coincide. The connecting bolt (311) passes through the center hole and the second through hole (3312) of the external gear to be tested in sequence, and the connecting bolt (311) is threadedly connected to the threaded blind hole (3321).

4. The gear backlash measuring instrument according to claim 3, characterized in that, Also includes: The housing (4) is inserted into the first through hole (21); The housing (4) has openings at both ends. The rotating shaft (5) is rotatably installed inside the housing (4) through bearings. The first end of the rotating shaft (5) extends out of the housing (4). The preset internal gear (52) is rotatably connected to the inner cavity of the housing (4) through bearings. The axes of the housing (4), the external gear to be tested (3311), and the preset internal gear (52) all coincide.

5. The gear backlash measuring instrument according to claim 4, characterized in that, A flange (8) is formed on the outside of the housing (4), and the flange (8) is fixedly connected to the first mounting base (2) by bolts and nuts.

6. The gear backlash measuring instrument according to claim 1, characterized in that, Also includes: Angle gauge mounting bracket (9), The angle gauge mounting base (9) is disposed on the rotating shaft (5), and the angle gauge mounting base (9) is located between the shaft head (51) and the first mounting base (2); The angle gauge (10) is mounted on the angle gauge mounting base (9).

7. The gear backlash measuring instrument according to claim 6, characterized in that, The angle gauge mounting base (9) includes: First arc-shaped sleeve (91) and second arc-shaped sleeve (92); The first arc-shaped sleeve (91) and the second arc-shaped sleeve (92) are sleeved and connected to the surface of the rotating shaft (5). The first arc-shaped sleeve (91) is disposed above the second arc-shaped sleeve (92). The top surface of the first arc-shaped sleeve (91) is formed with an installation platform. The angle gauge (10) is mounted on the mounting platform on the top surface of the first arc-shaped sleeve (91).

8. The gear backlash measuring instrument according to claim 2, characterized in that, Also includes: A slide rail (11) is provided on the upper surface of the base (1), the slide rail (11) extends toward the first mounting seat (2), and the bottom surface of the second column (32) is slidably connected to the slide rail (11).

9. The gear backlash measuring instrument according to claim 8, characterized in that, Also includes: Rotate the lead screw (6) mounted above the base (1), the lead screw (6) being parallel to the slide rail (11); A third through hole (22) is provided through the bottom of the first mounting base (2); The bottom of the second column (32) is provided with a lead screw thread hole (322); The third through hole (22) coincides with the axis of the lead screw thread hole (322); The first end of the rotating lead screw (6) passes through the third through hole (22), and the rotating lead screw (6) is threadedly connected to the lead screw thread hole (322).

10. The gear backlash measuring instrument according to claim 9, characterized in that, Also includes: A drive device (7) is fixedly mounted on the base (1), and the output end of the drive device (7) is connected to the second end of the rotating lead screw (6).

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