Gear pair ghost frequency noise detection table

Abstract

A gear pair ghost frequency noise detection table disclosed by the present invention comprises a base, and a first driving loading assembly and a second driving loading assembly arranged on the base, the first driving loading assembly comprises a first stand column, and the first stand column is downwards provided with a first jacking clamping mechanism in a vertically movable manner; a first driving loading mechanism which is coaxially and upwards arranged is arranged below the first jacking and clamping mechanism; the second driving loading assembly comprises a second stand column, and the second stand column is movably arranged on the base through a first linear driving mechanism extending towards the first driving loading assembly; a second driving and loading mechanism and a second jacking and clamping mechanism which are oppositely arranged in the vertical direction are arranged on the side, facing the first driving and loading assembly, of the second stand column, and the second driving and loading mechanism is movably arranged on the second stand column through a second linear driving mechanism which is vertically arranged. The device has the advantages of being reasonable in structural design, capable of conducting simulation operation on the gear pair, high in clamping efficiency, convenient to operate and use, beneficial to improving the detection accuracy and the like.

Description

Technical Field

[0001] The invention relates to the technical field of automobile component performance detection, and in particular to a gear pair ghost frequency noise detection platform. Background Art

[0002] With the support of various simulation analysis auxiliary technologies such as CAD and CAE, the theoretical design of transmission accuracy of gear pairs for domestic new energy reducers has reached the international advanced level. However, due to factors such as processing and manufacturing, there is still a large difference between the gear pair tooth surface and the theoretical design tooth surface, which leads to additional errors in the gear pair tooth surface during the manufacturing process. The errors are stimulated by the meshing force during the meshing process to produce additional vibration noise, collectively referred to as ghost noise. However, new energy electric vehicles do not have engine noise masking, and the ghost noise is abnormally obvious, which seriously affects the comfort of the whole vehicle. In order to solve the ghost noise of new energy reducer gear pairs from the source, it is necessary to inspect the quality of gear pairs in advance at the stage of gear pair manufacturing and processing, identify and intercept gear pairs with ghost noise, so as to improve the quality of factory gear pairs and reduce the rework cost of new energy reducers. To detect ghost noise on gear pairs, it is necessary to simulate the operating state of gear pairs on the detection equipment and perform online noise detection. Therefore, how to simulate the operation of gear pairs in pairs has become an urgent problem to be solved. Summary of the invention

[0003] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is: how to provide a gear pair ghost frequency noise detection platform with reasonable structural design, capable of simulating the operation of gear pairs in pairs, high clamping efficiency, easy operation and use, and conducive to improving detection accuracy.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions: A gear pair ghost frequency noise detection platform, comprising a base, a first drive loading assembly and a second drive loading assembly arranged on the base, the first drive loading assembly comprising a first column vertically arranged on the base, a first top clamping mechanism being vertically movably arranged downward on the first column, a first drive loading mechanism being coaxially arranged upward below the first top clamping mechanism, an output end of the first drive loading mechanism having a first gear clamping mechanism for coaxially transmitting and connecting to a first gear to be tested; the second drive loading assembly comprising a second column vertically arranged, the bottom of the second column being movably arranged on the base through a first linear drive mechanism extending toward the first drive loading assembly; the second column having a second drive loading mechanism and a second top clamping mechanism being coaxially arranged opposite to each other on a side facing the first drive loading assembly, the output end of the second drive loading mechanism being connected downward to a second gear clamping mechanism for coaxially transmitting and connecting to a second gear to be tested, and being movably arranged on the second column through a second linear drive mechanism arranged vertically.

[0005] With the above structure, the output end of the second drive loading mechanism faces downward, while the output end of the first drive loading mechanism faces upward, so that the second drive loading mechanism and the first drive loading mechanism are staggered at both ends of the axial direction of the gear pair to be tested, reducing the radial interference space between the second drive loading assembly and the first drive loading assembly, and reducing the minimum axial center distance between the two, so as to be suitable for use in gear pairs with smaller axial center distances. Before testing, the second column is moved in a direction away from the first drive loading assembly, the second gear to be tested is vertically placed between the second top clamping mechanism and the second gear clamping mechanism, and the second drive loading mechanism is moved to complete the clamping of the second gear to be tested; the first gear to be tested is vertically placed between the first gear clamping mechanism and the first top clamping mechanism, and the first top clamping mechanism is moved to complete the clamping of the first gear to be tested; the second column is moved toward the first drive loading assembly and the meshing of the second gear to be tested and the first gear to be tested is completed to form a gear pair; the gear pair is driven and loaded by the first drive loading mechanism and the second drive loading mechanism respectively, so that the loaded operation of the gear pair can be simulated. The above structure can detect paired gear pairs, and compared with the detection of a single gear, the detection accuracy can be improved.

[0006] Furthermore, the first top clamping mechanism is movably disposed on the first column via a third linear drive mechanism disposed vertically, and the second top clamping mechanism is movably disposed on the second column via a fourth linear drive mechanism disposed vertically.

[0007] For different types of gear pairs, when the first gear to be tested is vertically clamped on the first gear clamping mechanism, the height of the meshing position of the gear pair will be different because the height of the lower end position remains unchanged. Since the second top clamping mechanism and the second drive loading mechanism can both move vertically, the second drive loading assembly can adjust the second top clamping mechanism and the second drive loading mechanism vertically according to the height of the meshing position of the gear pair, so that the first gear to be tested and the second gear to be tested can be kept at the corresponding meshing height, thereby adapting to the use of more types of gear pairs.

[0008] Furthermore, the first linear drive mechanism, the second linear drive mechanism, the third linear drive mechanism and the fourth linear drive mechanism each include two parallel linear guide rails, and a support plate is movably mounted on the two linear guide rails via a slider; the second column, the second drive loading mechanism, the first top clamping mechanism and the second top clamping mechanism are respectively installed on the corresponding support plates.

[0009] Furthermore, a clamp is provided on the linear guide rail, and the supporting plate is connected to the clamp.

[0010] In this way, the support plate can be reliably kept in a fixed position by the clamp, so that the gear pair can operate more stably, which is beneficial to improving the accuracy and reliability of detection.

[0011] Furthermore, the first top clamping mechanism and the second top clamping mechanism both include a vertically arranged tapered sleeve and a rotating center, the rotating center includes a main body that is generally cylindrical, one end of the main body has a coaxially arranged centering rod, and the other end has a coaxially arranged conical center; one end of the tapered sleeve has a vertically arranged centering hole, and the centering rod is coaxially fitted on the centering hole.

[0012] Furthermore, on the rotating top of the second top clamping mechanism, the top includes a positioning column coaxially connected to the main body, and the end of the positioning column is connected with a cone tip, and the maximum diameter of the cone tip is larger than the diameter of the end center hole of the second gear to be measured; the positioning column is equipped with an anti-tilt sleeve, and the outward end of the anti-tilt sleeve has an anti-tilt hole matching the end diameter of the second gear to be measured, and the anti-tilt hole extends inward to the positioning column; the distance from the position on the cone tip that is consistent with the diameter of the end center hole of the second gear to be measured to the outer end of the anti-tilt sleeve is smaller than the length of the end shaft section of the gear to be measured.

[0013] In this way, the anti-tilt sleeve is matched on the positioning column, and the anti-tilt hole at the end extends to the positioning column, so that the cone tip is completely in the anti-tilt hole; at the same time, the distance from the position on the cone tip that is consistent with the diameter of the center hole at the end of the gear to the outer end of the anti-tilt sleeve is less than the length of the end shaft section of the gear to be tested, so that when the gear to be tested is matched with the cone tip, the end of the anti-tilt sleeve will not interfere with the protrusion on the gear, and the end center hole of the second gear to be tested can reliably abut on the cone tip. At the same time, because the outer diameter of the anti-tilt hole matches the end diameter of the gear to be tested, the gear can be kept upright to avoid tipping, thereby facilitating quick alignment.

[0014] Furthermore, one end of the second gear to be tested has an internal spline, and the second gear clamping mechanism includes a spline head matching the internal spline on the second gear to be tested.

[0015] Furthermore, the first driving loading mechanism includes a top plate and a bottom plate, the bottom plate is fixedly arranged below the top plate by a support member, the top plate is provided with a vertically arranged bearing seat, the bearing seat includes a cylindrical shell and a main shaft rotatably passed through the shell by a bearing, the upper end of the main shaft passes through the shell and is connected to the first gear clamping mechanism; the lower end of the main shaft passes through the top plate and is connected to a torque sensor through a first coupling; a loading motor is provided below the bottom plate coaxially with the main shaft, the output shaft of the loading motor passes through the bottom plate upward and is connected to the other end of the torque sensor through a second coupling; a coaxially arranged circular grating is installed at the lower end of the main shaft.

[0016] Furthermore, the end of the main shaft has a coaxially arranged first centering hole, and the diameter of the first centering hole gradually increases from the inside to the outside; the first gear clamping mechanism includes a top body that is generally cylindrical, and one end of the top body has a protruding first centering sleeve, and the outer diameter of the first centering sleeve gradually decreases in the direction away from the top body, and the taper is consistent with the taper of the first centering hole; the first centering sleeve is coaxially fitted in the first centering hole, and a fastening structure is arranged between the first gear clamping mechanism and the main shaft.

[0017] Furthermore, the end of the first centering sleeve has a first positioning groove which is radially penetrated; the first centering hole has a positioning block which protrudes radially inward, the width of the positioning block matches the width of the first positioning groove, and is fitted in the first positioning groove.

[0018] In summary, the present invention has the advantages of reasonable structural design, ability to simulate the operation of a gear pair, high clamping efficiency, convenient operation and use, and being conducive to improving detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the overall structure of the gear pair ghost frequency noise detection platform of this embodiment.

[0020] Figure 2 for Figure 1 Schematic diagram of the overall structure of the first drive loading component.

[0021] Figure 3 for Figure 1 Schematic diagram of the overall structure of the second drive loading component.

[0022] Figure 4 It is a schematic diagram of the cross-sectional structure of the gear pair.

[0023] Figure 5 It is a schematic diagram of the exploded structure of the second top clamping mechanism.

[0024] Figure 6 It is a schematic diagram of the exploded structure of the second gear clamping mechanism.

[0025] Figure 7 Schematic diagram of the drive shaft structure.

[0026] Figure 8 It is a schematic cross-sectional structural diagram of the second top clamping mechanism and the second gear clamping mechanism.

[0027] Fig. 9 It is a structural schematic diagram of the first drive loading mechanism.

[0028] Fig.10 It is a schematic cross-sectional structural diagram of the first drive loading mechanism.

[0029] Fig.11 It is a schematic diagram of the cross-sectional structure of the first coupling.

[0030] Fig.12 Schematic diagram of the exploded structure of the first coupling.

[0031] Fig.13 It is a schematic diagram of the cross-sectional structure of the bearing seat.

[0032] Fig.14 It is a structural schematic diagram of the first gear clamping mechanism.

[0033] Fig.15 It is a schematic diagram of the exploded structure of the first gear clamping mechanism and the transmission spline sleeve.

[0034] Fig.16 It is a schematic cross-sectional structural diagram of the first gear clamping mechanism and the transmission spline sleeve.

[0035] Fig.17 It is a structural schematic diagram of the transmission spline sleeve.

[0036] Fig.18It is another structural schematic diagram of the transmission spline sleeve. DETAILED DESCRIPTION

[0037] The present invention is further described in detail below in conjunction with embodiments.

[0038] Specific implementation: a gear pair ghost frequency noise detection platform, such as Figure 1 to Figure 3 As shown, it includes a base 1, a first drive loading assembly 2 and a second drive loading assembly 3 arranged on the base 1, the first drive loading assembly 2 includes a first column 21 vertically arranged on the base 1, a first top clamping mechanism 22 is vertically movably arranged downward on the first column 21, a first drive loading mechanism 23 is coaxially arranged upward below the first top clamping mechanism 22, and the output end of the first drive loading mechanism 23 has a first gear clamping mechanism 4 for coaxially connecting to the first gear to be tested; the second drive loading assembly 3 includes a second column 31 vertically arranged, the bottom of the second column 31 is movably arranged on the base 1 through a first linear drive mechanism 32 extending toward the first drive loading assembly 2; the second column 31 has a second drive loading mechanism 33 and a second top clamping mechanism 34 arranged vertically coaxially opposite to each other on the side facing the first drive loading assembly 2, the output end of the second drive loading mechanism 33 is downwardly connected to a second gear clamping mechanism 5 for coaxially connecting to the second gear to be tested, and is movably arranged on the second column 31 through a second linear drive mechanism 35 vertically arranged.

[0039] With the above structure, the output end of the second drive loading mechanism faces downward, while the output end of the first drive loading mechanism faces upward, so that the second drive loading mechanism and the first drive loading mechanism are staggered at both ends of the axial direction of the gear pair to be tested, reducing the interference space between the second drive loading assembly and the first drive loading assembly in the radial direction, and can reduce the minimum axial center distance between the two, so that it is suitable for use in gear pairs with smaller axial center distances, such as Figure 1 As shown. Before the test, move the second column in a direction away from the first drive loading assembly, vertically place the second gear to be tested between the second top clamping mechanism and the second gear clamping mechanism, and move the second drive loading mechanism to complete the clamping of the second gear to be tested; vertically place the first gear to be tested between the first gear clamping mechanism and the first top clamping mechanism, and move the first top clamping mechanism to complete the clamping of the first gear to be tested; move the second column toward the first drive loading assembly and complete the meshing of the second gear to be tested and the first gear to be tested to form a gear pair; apply drive and load to the gear pair through the first drive loading mechanism and the second drive loading mechanism respectively, so as to simulate the loaded operation of the gear pair. The above structure can detect paired gear pairs, which can improve the accuracy of detection compared to the detection of a single gear.

[0040] In this embodiment, the first top clamping mechanism 22 is movably disposed on the first column 21 via a vertically disposed third linear drive mechanism 24 , and the second top clamping mechanism 34 is movably disposed on the second column 31 via a vertically disposed fourth linear drive mechanism 36 .

[0041] For different types of gear pairs, when the first gear to be tested is vertically clamped on the first gear clamping mechanism, the height of the meshing position of the gear pair will be different because the height of the lower end position remains unchanged. Since the second top clamping mechanism and the second drive loading mechanism can both move vertically, the second drive loading assembly can adjust the second top clamping mechanism and the second drive loading mechanism vertically according to the height of the meshing position of the gear pair, so that the first gear to be tested and the second gear to be tested can be kept at the corresponding meshing height, thereby adapting to the use of more types of gear pairs.

[0042] Specifically, the first linear drive mechanism 32, the second linear drive mechanism 35, the third linear drive mechanism 24 and the fourth linear drive mechanism 36 each include two parallel linear guide rails, a support plate is movably mounted on the two linear guide rails through a slider, a parallel ball screw mechanism is provided between the two linear guide rails, one end of the ball screw mechanism is connected to a motor, and the support plate is mounted on the screw nut of the ball screw mechanism through bolts; a clamp is provided on the linear guide rail, and the support plate is connected to the clamp. The second column 31, the second drive loading mechanism 33, the first top clamp mechanism 22 and the second top clamp mechanism 34 are respectively mounted on the corresponding support plates.

[0043] In this way, the support plate can be reliably kept in a fixed position by the clamp, so that the gear pair can operate more stably, which is beneficial to improving the accuracy and reliability of detection.

[0044] Usually, the shaft ends of the two gears on the gear pair have end center holes. In this embodiment, one end of one of the gears has an internal spline, such as Figure 4 The first clamping mechanism 22 and the second clamping mechanism 34 both include a vertically arranged conical sleeve 61 and a rotating top 62, wherein the rotating top 62 includes a cylindrical body 621, one end of the body 621 has a coaxially arranged centering rod 622, and the other end has a coaxially arranged conical top 623; Figure 5 As shown, the diameter of the centering rod 622 gradually decreases in the direction away from the main body 621, and one end of the tapered sleeve 61 has a vertically arranged centering hole, and the centering hole has a taper consistent with the centering rod 622, and the centering rod 622 is tightly coaxially fitted on the centering hole.

[0045] In this embodiment, since the second top clamping mechanism 34 is vertically arranged upward, and since the top has a taper, the second gear to be tested placed on the top is easy to tip over, which makes it inconvenient for the second gear clamping mechanism at the upper end to be centered. To this end, on the rotating top 62 of the second top clamping mechanism 34, the top 623 includes a positioning column coaxially connected to the body 1, and the end of the positioning column is connected with a cone tip, and the maximum diameter of the cone tip is larger than the diameter of the end center hole of the second gear to be tested; the positioning column is equipped with an anti-tilt sleeve 624, and the outward end of the anti-tilt sleeve 624 has an anti-tilt hole matching the end diameter of the second gear to be tested, and the anti-tilt hole extends inward to the positioning column; the distance from the position on the cone tip that is consistent with the diameter of the end center hole of the second gear to be tested to the outer end of the anti-tilt sleeve 624 is less than the end shaft length of the gear to be tested.

[0046] In this way, the anti-tilt sleeve is matched on the positioning column, and the anti-tilt hole at the end extends to the positioning column, so that the cone tip is completely in the anti-tilt hole; at the same time, the distance from the position on the cone tip that is consistent with the diameter of the center hole at the end of the gear to the outer end of the anti-tilt sleeve is less than the length of the end shaft section of the gear to be tested, so that when the gear to be tested is matched with the cone tip, the end of the anti-tilt sleeve will not interfere with the protrusion on the gear, and the end center hole of the second gear to be tested can reliably abut on the cone tip. At the same time, because the outer diameter of the anti-tilt hole matches the end diameter of the gear to be tested, the gear can be kept upright to avoid tipping, thereby facilitating quick alignment.

[0047] In this embodiment, the anti-tilt sleeve 624 has a through-set positioning hole at one end facing the body 1, the inner diameter of the positioning hole matches the outer diameter of the positioning post, and is sleeved on the positioning post, and the end of the anti-tilt hole has a guide portion with a gradually increasing diameter. In specific implementation, a threaded connection structure can also be used between the anti-tilt sleeve 624 and the positioning post, such as: the positioning post has an external thread, and the anti-tilt sleeve 624 has a through-set threaded hole at one end facing the body 621, and is screwed onto the positioning post.

[0048] During implementation, one end of the second gear to be tested has an internal spline, and the second gear clamping mechanism 5 includes a spline head 51 that matches the internal spline on the second gear to be tested.

[0049] like Figure 6 and Figure 8As shown, the output end of the second driving loading mechanism 33 is coaxially connected with a driving shaft 52, and a centering shaft 53 is detachably connected to the driving shaft 52, and the centering shaft 53 has a coaxially arranged spring cavity 531 at one end facing the driving shaft 52, and a transmission hole is coaxially arranged through the bottom of the spring cavity 531, and the transmission hole has a guide structure arranged axially; a transmission shaft 54 ​​is axially movably matched on the transmission hole, and a spring 55 is abutted between the inner end of the transmission shaft 54 ​​and the driving shaft 52; the outer end of the transmission shaft 54 ​​is provided with a spline head 51 for matching with the internal spline of the gear to be tested.

[0050] In this embodiment, the guide mechanism is a spline arranged on the transmission hole, and the transmission shaft 54 ​​has an external spline matching the spline. The external spline is arranged to penetrate inward along the axial direction of the transmission shaft 54, and the inner end of the transmission shaft 54 ​​has an external retaining ring groove extending in the circumferential direction, and the external retaining ring groove is matched with an external retaining ring baffle. The spline head 51 is coaxially provided with a spline hole matching the external spline, and the spline head 51 is detachably matched with the external spline of the transmission shaft 54 ​​through the spline hole. In this way, the spline head can be replaced according to the model of the internal spline of the different gears to be tested, so as to adapt to more models of gears for testing.

[0051] The spline hole is provided through the spline head 51, and the outward end of the spline hole has an internal retaining ring groove extending in the circumferential direction, and is matched with an internal retaining ring. At the same time, the diameter of the outward end of the spline head 51 gradually decreases to a truncated cone shape. Thus, the spline head can better match the internal spline of the gear to be tested by using the truncated cone end.

[0052] The end of the centering shaft 53 facing the spline head 51 has a tapered top connection section with a gradually decreasing diameter, the maximum diameter of the top connection section is larger than the diameter of the end center hole of the second gear to be measured, and the minimum diameter is smaller than the diameter of the end center hole of the second gear to be measured. In this way, the tapered top connection section can be used to cooperate with the inner hole of the gear to be measured to achieve a coaxial connection.

[0053] With the above structure, the second drive loading mechanism drives the spline head to rotate slowly while slowly moving the spline head toward the internal spline of the gear to be tested. When the spline head contacts the internal spline of the gear, the transmission shaft compresses the spring inward to avoid impact between the spline head and the internal spline. When the spline head rotates to a position that matches the internal spline, the transmission shaft and the internal spline are pushed out by the spring, thereby completing the matching between the spline head and the internal spline. This structure can avoid the impact between the spline head and the internal spline, which can not only avoid damage to equipment or parts, but also improve the efficiency of spline matching.

[0054] like Figure 6 and Figure 7 As shown, the end of the driving shaft 52 has a coaxially arranged second centering hole 521, and the diameter of the second centering hole 521 gradually increases from the inside to the outside; the end of the centering shaft 53 has a second centering sleeve 532 protruding toward one end of the driving shaft 52, and the outer diameter of the second centering sleeve 532 gradually decreases in the direction toward the driving shaft 52, and the taper is consistent with the taper of the second centering hole 521; a locking mechanism is arranged between the driving shaft 52 and the centering shaft 53, so that the second centering sleeve 532 is tightly and concentrically fitted in the second centering hole 521. The end of the second centering sleeve 532 has a second positioning groove 533 that is radially through; the second centering hole 521 has a second positioning block 522 that protrudes radially inward, and the width of the second positioning block 522 matches the width of the second positioning groove 533, and fits in the second positioning groove 533.

[0055] The end of the driving shaft 52 has threaded holes evenly distributed along the circumference of the second centering hole 521; the centering shaft 53 has a second flange 534 protruding radially outward along the second centering sleeve 532, and the second flange 534 has bolt holes arranged corresponding to the threaded holes, and the locking mechanism is a bolt passing through the bolt hole and connected to the threaded hole.

[0056] For another gear on the gear pair, the first driving loading mechanism 23 includes a top plate 231 and a bottom plate 232, wherein the bottom plate 232 is fixedly arranged below the top plate 231 through a supporting member 233, and the supporting member 233 is a side plate arranged on both sides of the top plate 231. Fig. 9 and Fig.10 As shown. The top plate 231 has a vertically arranged bearing seat 234, the bearing seat 234 includes a cylindrical shell 2341 and a main shaft 2342 rotatably arranged on the shell 2341 through a bearing, the upper end of the main shaft 2342 passes through the shell 2341 and is connected to the first gear clamping mechanism 4; the lower end of the main shaft 2342 passes through the top plate 231 and is connected to a torque sensor 236 through a first coupling 235; a loading motor 237 coaxially arranged with the main shaft 2342 is provided below the bottom plate 232, the output shaft of the loading motor 237 passes through the bottom plate 232 upward, and is connected to the other end of the torque sensor 236 through a second coupling 238; a coaxially arranged circular grating 239 is installed at the lower end of the main shaft 2342.

[0057] like Fig.11 and Fig.12As shown, the first coupling 235 includes a tapered sleeve flange 2351 sleeved on the main shaft 2342, the tapered sleeve flange 2351 has a tapered sleeve with an outer diameter gradually decreasing in the direction away from the torque sensor 236, and the tapered sleeve has a groove arranged radially through; a tapered ring 2352 is sleeved on the tapered sleeve, and the inner hole of the tapered ring 2352 has an inner conical surface consistent with the taper of the tapered sleeve; the maximum inner diameter of the tapered ring 2352 is smaller than the maximum outer diameter of the tapered sleeve; the tapered ring 2352 has first threaded holes uniformly distributed along the circumferential direction, and the tapered sleeve flange 2351 has countersunk bolt holes arranged corresponding to the first threaded holes, and is connected to the first threaded holes of the tapered ring 2352 by fastening bolts.

[0058] The outer circumferential surface of the tapered sleeve flange 2351 has a tapered step formed inwardly along the radial direction, and the outer circumferential surface of the tapered step has a taper matching the circular grating 239, and the circular grating 239 is coaxially fitted on the tapered step; the tapered sleeve flange 2351 has a second threaded hole arranged corresponding to the bolt hole on the circular grating 239, and the circular grating 239 is fixed to the tapered sleeve flange 2351 by bolts.

[0059] like Fig.13 As shown, the housing 2341 has a flange 2346 protruding outward in the radial direction, and is mounted on the top plate 231 by bolts. A first end cover 2347 is provided at one end of the housing 2341, and a second end cover 2349 is provided at the other end. The first end cover 2347 and the second end cover 2349 both have a top sleeve protruding toward the housing 2341, and the outer diameter of the top sleeve matches the inner diameter of the housing 2341, and abuts against the corresponding outer ring of the bearing; the two ends of the housing 2341 have threaded holes distributed in the circumferential direction, and the first end cover 2347 and the second end cover 2349 both have bolt holes corresponding to the threaded holes, and are mounted on the housing 2341 by bolts. The inner diameter of the first end cover 2347 matches the outer diameter of the corresponding position on the main shaft 2342, and is loosely fitted on the main shaft 2342; the inner wall of the first end cover 2347 has an annular groove extending circumferentially, and the bottom of the annular groove is provided with an air inlet hole for connecting positive pressure gas. In order to facilitate the connection of the air source, a pneumatic joint is installed on the air inlet hole.

[0060] When in use, the air inlet is connected to the air source, and positive pressure is formed after the positive pressure gas enters the annular groove through the air inlet. Since the first end cover and the main shaft are clearance-matched, the positive pressure gas in the annular groove will be blown outward from the gap between the two, thereby preventing impurities from staying in the gap between the main shaft and the second end cover or entering the housing, thereby slowing down or reducing the accumulation of impurities, which is beneficial to extending the service life of the bearing seat.

[0061] The main shaft 2342 is sleeved with an inner sleeve 2350, and the two ends of the inner sleeve 2350 are respectively abutted against the inner rings of the bearings at the two ends; the housing 2341 is embedded with an outer sleeve 2348, and the inner diameter of the outer sleeve 2348 is larger than the outer diameter of the inner sleeve 2350, and the two ends are respectively abutted against the outer rings of the bearings at the two ends. Specifically, the two ends of the main shaft 2342 each have two angular contact bearings mounted back to back. The housing 2341 has a temperature measuring threaded hole set in a radial direction, and the temperature measuring threaded hole is provided with two holes, which are respectively opposite to the bearings at the two ends, and the temperature sensor 2345 is installed on the temperature measuring threaded hole.

[0062] like Figure 14 to Figure 16 As shown, the end of the main shaft 2342 has a first centering hole coaxially arranged, and the diameter of the first centering hole gradually increases from the inside to the outside; the first gear clamping mechanism 4 includes a top body 41 that is cylindrical as a whole, and one end of the top body 41 has a first centering sleeve 42 protrudingly arranged, and the outer diameter of the first centering sleeve 42 gradually decreases in the direction away from the top body 41, and the taper is consistent with the taper of the first centering hole; the first centering sleeve 42 is coaxially fitted in the first centering hole, and a fastening structure is provided between the first gear clamping mechanism 4 and the main shaft 2342. The outer conical surface of the first centering sleeve is matched with the inner conical surface of the first centering hole, so that the first gear clamping mechanism can be quickly coaxially installed in the first centering hole of the drive shaft. For different models of gears to be tested, they can be tested by replacing the first gear clamping mechanism.

[0063] The end of the first centering sleeve 42 has a first positioning groove 43 which is radially through-set; the first centering hole has a positioning block which is radially protruding inwardly, the width of which matches the width of the first positioning groove 43 and fits in the first positioning groove 43. The torque can be better transmitted by the cooperation of the first positioning groove and the first positioning block. The end of the main shaft 2342 has third threaded holes which are evenly distributed along the circumference of the first centering hole; the first gear clamping mechanism 4 has a first flange 44 which protrudes radially outwardly along the first centering sleeve 42, the first flange 44 has bolt holes which are arranged corresponding to the third threaded holes, and the fastening structure is a bolt which passes through the bolt holes and is connected to the third threaded holes. The other end of the top body 41 has a coaxially arranged top column 45, the top column 45 has a top connection portion 46, the diameter of which gradually decreases in the direction away from the top body 41, the minimum diameter of the top connection portion is smaller than the center hole diameter of the end of the gear to be measured, and the maximum diameter is larger than the center hole diameter of the end of the gear to be measured.

[0064] like Figure 4 As shown, since the lower end of the gear on the right side of the gear pair does not have an internal spline or an external spline, the first driving loading mechanism 23 cannot apply a load to it. For this reason, a transmission spline sleeve 7 is also provided in this embodiment. Fig.17 As shown, it includes a cylindrical sleeve 71, one end of which is coaxially provided with an axial hole 72 that matches the shaft end diameter of the gear to be measured, and the shaft hole 72 is provided with a clamping mechanism 73 for reducing the aperture, so that the minimum aperture of the shaft hole 72 is smaller than the shaft end diameter of the gear to be measured; the outer circumferential surface of the other end of the sleeve 71 is provided with an external spline 74 protruding outward. In this embodiment, the end of the sleeve 71 away from the external spline 74 has a semicircular ring 711 extending in the axial direction, and the clamping mechanism 73 includes a semicircular holding ring as a whole, the inner diameter of the holding ring and the inner diameter of the semicircular ring 711 are both equal to the diameter of the shaft end of the gear to be measured, the holding ring and the semicircular ring 711 are spliced ​​in the radial direction to form the shaft hole 72, and there is a gap on the opposite side of the two; the two ends of the holding ring have bolt holes set through toward the semicircular ring 711, and the semicircular ring 711 has threaded holes set corresponding to the bolt holes, and the holding ring is connected to the threaded holes of the semicircular ring 711 by bolts passing through the bolt holes. Since there is a gap between the holding ring and the semicircular ring, and the inner diameters of the two are equal to the diameter of the shaft end of the gear to be measured, when force is applied to the bolt, the holding ring will continue to approach the semicircular ring, thereby clamping the shaft end of the gear to be measured.

[0065] In specific implementation, a hydraulic clamping mechanism can also be used, such as Fig.18As shown, the clamping mechanism 73 includes an annular pressure chamber 731 which is circumferentially arranged in the end of the sleeve 71 away from the external spline 74, and the side wall between the annular pressure chamber 731 and the axial hole 72 forms a deformable expansion sleeve wall 732; the sleeve 71 is provided with a cylindrical piston chamber 733, and is equipped with a piston 734, the piston chamber 733 is connected to the annular pressure chamber 731 through an oil channel, and is filled with hydraulic oil; the outer end side wall of the piston chamber 733 is provided with a thread, and is equipped with a locking bolt 735, and the locking bolt 735 abuts against the piston 734.

[0066] The top connection portion 46 has a coaxially arranged guide rod, and the end of the guide rod has a guide block 48 protruding in the radial direction. The diameter of the guide block 48 is consistent with the inner hole diameter of the gear to be measured, and the end diameter of the guide block 48 gradually decreases to form a truncated cone. Fig.16 As shown, the guide block on the guide rod can be used to cooperate with the inner hole of the gear to be measured to assist in centering. The end of the top body 41 facing the top column 45 is connected to a coaxial transmission sleeve 47, and the end of the transmission sleeve 47 facing away from the top body 41 is provided with an internal spline, which is used to cooperate with the external spline on the gear to be measured.

[0067] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A gear pair ghost frequency noise detection platform, characterized in that: The invention comprises a base (1), a first drive loading assembly (2) and a second drive loading assembly (3) arranged on the base (1), wherein the first drive loading assembly (2) comprises a first column (21) arranged vertically on the base (1), a first top clamping mechanism (22) being arranged vertically and movably downward, a first drive loading mechanism (23) being arranged coaxially upward below the first top clamping mechanism (22), and an output end of the first drive loading mechanism (23) having a first gear clamping mechanism (4) for coaxially driving and connecting to a first gear to be tested; the second drive loading assembly (3) comprises a second column (21) arranged vertically and a first gear clamping mechanism (4) being arranged vertically and a first gear clamping mechanism (4) being arranged coaxially and connecting to a first gear to be tested; The second column (31) is provided with a first linear drive mechanism (32) extending toward the first drive loading assembly (2), and the bottom of the second column (31) is movably arranged on the base (1); the second column (31) has a second drive loading mechanism (33) and a second top clamping mechanism (34) arranged vertically coaxially opposite to each other on one side of the second column (31) facing the first drive loading assembly (2); the output end of the second drive loading mechanism (33) is downwardly connected to a second gear clamping mechanism (5) for coaxially connecting to a second gear to be tested, and is movably arranged on the second column (31) through a second linear drive mechanism (35) arranged vertically.

2. The gear pair ghost frequency noise detection platform as claimed in claim 1, characterized in that: The first top clamping mechanism (22) is movably arranged on the first upright column (21) via a third linear drive mechanism (24) arranged vertically, and the second top clamping mechanism (34) is movably arranged on the second upright column (31) via a fourth linear drive mechanism (36) arranged vertically.

3. The gear pair ghost frequency noise detection platform as claimed in claim 2, characterized in that: The first linear drive mechanism (32), the second linear drive mechanism (35), the third linear drive mechanism (24) and the fourth linear drive mechanism (36) each comprise two parallel linear guide rails, on which a support plate is movably mounted via a slider; the second upright column (31), the second drive loading mechanism (33), the first top clamping mechanism (22) and the second top clamping mechanism (34) are respectively mounted on the corresponding support plates.

4. The gear pair ghost frequency noise detection platform as claimed in claim 3, characterized in that: A clamp is arranged on the linear guide rail, and the supporting plate is connected to the clamp.

5. The gear pair ghost frequency noise detection platform as claimed in claim 1 or 2, characterized in that: The first top clamping mechanism (22) and the second top clamping mechanism (34) both comprise a vertically arranged tapered sleeve seat (61) and a revolving centering point (62); the revolving centering point (62) comprises a body (621) which is generally cylindrical; one end of the body (621) comprises a coaxially arranged centering rod (622); and the other end comprises a coaxially arranged conical centering point (623); one end of the tapered sleeve seat (61) comprises a vertically arranged centering hole, and the centering rod (622) is coaxially fitted on the centering hole.

6. The gear pair ghost frequency noise detection platform as claimed in claim 5, characterized in that: On the rotary top (62) of the second top clamping mechanism (34), the top (623) includes a positioning column coaxially connected to the body (1), the end of the positioning column is connectedly provided with a cone tip, the maximum diameter of the cone tip is larger than the diameter of the end center hole of the second gear to be measured; the positioning column is matched with an anti-tilt sleeve (624), the outward end of the anti-tilt sleeve (624) has an anti-tilt hole matching the end diameter of the second gear to be measured, and the anti-tilt hole extends inwardly to the positioning column; the distance from the position on the cone tip that is consistent with the end center hole diameter of the second gear to be measured to the outer end of the anti-tilt sleeve (624) is smaller than the length of the end shaft section of the gear to be measured.

7. The gear pair ghost frequency noise detection platform as claimed in claim 6, characterized in that: One end of the second gear to be tested has an internal spline, and the second gear clamping mechanism (5) comprises a spline head (51) matching the internal spline on the second gear to be tested.

8. The gear pair ghost frequency noise detection platform as claimed in claim 1 or 2, characterized in that: The first driving loading mechanism (23) comprises a top plate (231) and a bottom plate (232), wherein the bottom plate (232) is fixedly arranged below the top plate (231) via a support member (233), and a vertically arranged bearing seat (234) is provided on the top plate (231), wherein the bearing seat (234) comprises a cylindrical shell (2341) and a main shaft (2342) rotatably passed through the shell (2341) via a bearing, wherein the upper end of the main shaft (2342) passes through the shell (2341) and is connected to the first gear clamping mechanism. The main shaft (2342) is connected to a structure (4); the lower end of the main shaft (2342) passes through the top plate (231) and is connected to a torque sensor (236) via a first coupling (235); a loading motor (237) is provided below the bottom plate (232) and is coaxially arranged with the main shaft (2342); the output shaft of the loading motor (237) passes through the bottom plate (232) upwards and is connected to the other end of the torque sensor (236) via a second coupling (238); and a coaxially arranged circular grating (239) is installed at the lower end of the main shaft (2342).

9. The gear pair ghost frequency noise detection platform as claimed in claim 8, characterized in that: The end of the main shaft (2342) has a first centering hole coaxially arranged, and the diameter of the first centering hole gradually increases from the inside to the outside; the first gear clamping mechanism (4) includes a top body (41) that is generally cylindrical, and one end of the top body (41) has a first centering sleeve (42) protruding therefrom, and the outer diameter of the first centering sleeve (42) gradually decreases in a direction away from the top body (41), and the taper is consistent with the taper of the first centering hole; the first centering sleeve (42) is coaxially fitted in the first centering hole, and a fastening structure is arranged between the first gear clamping mechanism (4) and the main shaft (2342).

10. The gear pair ghost frequency noise detection platform as claimed in claim 9, characterized in that: The end of the first centering sleeve (42) has a first positioning groove (43) which is radially through-set; the first centering hole has a positioning block which protrudes radially inwards; the width of the positioning block matches the width of the first positioning groove (43) and fits in the first positioning groove (43).

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