Gear pair ghost-frequency noise testing platform

Abstract

Disclosed in the present invention is a gear pair ghost-frequency noise testing platform. The testing platform comprises a base, and a first driving and loading assembly and a second driving and loading assembly which are arranged on the base; the first driving and loading assembly comprises a first upright post, a first top clamping mechanism is arranged on the first upright post in a vertically movable manner and facing downwards, and a first driving and loading mechanism arranged coaxially and facing upwards is provided below the first top clamping mechanism; the second driving and loading assembly comprises a second upright post, and the second upright post is movably arranged on the base by means of a first linear driving mechanism extending towards the first driving and loading assembly; and a second driving and loading mechanism and a second top clamping mechanism which are oppositely arranged along the vertical direction are provided on the side of the second upright post facing the first driving and loading assembly, and the second driving and loading mechanism is movably arranged on the second upright post by means of a vertically arranged second linear driving mechanism. Advantages of the present invention include: a reasonable structural design, being able to perform simulated operation on gear pairs, high clamping efficiency, convenience of operation and use, and being beneficial to improving testing accuracy.

Description

Gear pair ghost frequency noise detection platform TECHNICAL FIELD

[0001] The present application relates to the technical field of automobile parts performance detection, in particular to a gear pair ghost frequency noise detection platform. BACKGROUND

[0002] The design of domestic new energy reducer gear pair has reached the international advanced level in terms of transmission precision theoretical design under the support of various simulation analysis auxiliary technologies such as CAD and CAE. However, due to the influence of factors such as machining and manufacturing, there is still a large difference between the gear pair tooth surface and the theoretical design tooth surface, thereby introducing additional errors in the manufacturing process of the gear pair tooth surface. The errors are excited by the meshing force in the meshing process to produce additional vibration noise, which is collectively referred to as ghost frequency noise. New energy electric vehicles do not have engine noise masking, and the ghost frequency noise is abnormally obvious, which seriously affects the comfort of the vehicle. In order to solve the problem of ghost frequency noise of new energy reducer gear pair from the source, it is necessary to inspect the quality of the gear pair in advance during the manufacturing and processing of the gear pair, identify and intercept the gear pair with ghost frequency noise, thereby improving the quality of the gear pair leaving the factory and reducing the repair cost of new energy reducer. In order to detect the ghost frequency noise of the gear pair, it is necessary to simulate the running state of the gear pair on the detection equipment for online noise detection. Therefore, how to simulate the running of the gear pair in pairs has become a problem to be solved. SUMMARY

[0003] In view of the above technical problems of the prior art, the technical problem to be solved by the present application is to provide a gear pair ghost frequency noise detection platform which has reasonable structure design, can simulate the running of the gear pair in pairs, has high clamping efficiency, is easy to operate and use, and is beneficial to improve the detection accuracy.

[0004] In order to solve the above technical problems, the technical scheme adopted by the present application is as follows:

[0005] The utility model provides a gear pair ghost frequency noise detection platform, including base, first drive loading assembly and second drive loading assembly set up on the base, first drive loading assembly includes vertical setting first stand on the base, first stand is vertically mobile downward with first top clamping mechanism set up, first top clamping mechanism's below has coaxial upward set first drive loading mechanism, and the output of first drive loading mechanism has first gear clamping mechanism for coaxial transmission connection to be measured first gear, second drive loading assembly includes vertical setting second stand, and the bottom of second stand is mobilely set up on the base through the first linear drive mechanism of setting and extending towards first drive loading assembly, the side of second stand towards first drive loading assembly has the second drive loading mechanism and second top clamping mechanism of vertical coaxial opposite setting, and the output of second drive loading mechanism is downwardly connected with second gear clamping mechanism for coaxial transmission connection to be measured second gear and is mobilely set up on second stand through the second linear drive mechanism of vertical setting.

[0006] With the above structure, the output of the second drive loading mechanism is downward, and the output of the first drive loading mechanism is upward, so that the second drive loading mechanism and the first drive loading mechanism are arranged at the two ends of the axial direction of the gear pair to be tested, the interference space in the radial direction of the second drive loading assembly and the first drive loading assembly is reduced, the minimum axial center distance of the two can be reduced, so as to be suitable for the gear pair with small axial center distance. Before testing, the second stand is moved 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, 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, the first top clamping mechanism is moved to complete the clamping of the first gear to be tested, the second stand is moved towards the first drive loading assembly to complete the meshing of the second gear to be tested and the first gear to be tested, forming a gear pair, and the first drive loading mechanism and the second drive loading mechanism are used to apply driving and load to the gear pair, so as to simulate the running of the gear pair under load. The above structure can detect the gear pair, and compared with the detection of a single gear, the accuracy of detection can be improved.

[0007] Further, the first top clamping mechanism is movably arranged on the first stand through the third linear drive mechanism arranged vertically, and the second top clamping mechanism is movably arranged on the second stand through the fourth linear drive mechanism arranged vertically.

[0008] For different types of gear pairs, the first gear to be tested is vertically clamped on the first gear clamping mechanism, and the height of the gear pair meshing position is different due to the unchanged height of the lower end position. Since the second clamping mechanism and the second driving loading mechanism can move vertically, the second driving loading assembly can adjust the second clamping mechanism and the second driving loading mechanism vertically according to the height of the gear pair meshing position, so that the first gear to be tested and the second gear to be tested are kept at the corresponding meshing height, thereby adapting to more types of gear pairs.

[0009] Further, 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 guides, and a support plate is movably arranged on the two linear guides through a sliding block; the second column, the second driving loading mechanism, the first clamping mechanism and the second clamping mechanism are respectively installed on the corresponding support plate.

[0010] Further, the linear guide is provided with a clamp, and the support plate is connected with the clamp.

[0011] In this way, the support plate can be reliably stopped at a fixed position by the clamp, so that the gear pair can operate more stably, thereby facilitating improvement of the accuracy and reliability of detection.

[0012] Further, the first clamping mechanism and the second clamping mechanism each include a vertically arranged taper sleeve seat and a rotary center, and the rotary center includes a cylindrical body, one end of the body has a coaxially arranged centering rod, and the other end is coaxially provided with a tapered center.

[0013] Further, the rotary center of the second clamping mechanism includes a positioning column coaxially connected to the body, and the end of the positioning column is connected with a tapered tip, and the maximum diameter of the tapered tip is greater than the diameter of the end center hole of the second gear to be tested; the positioning column is provided with an anti-tilt sleeve, and the outer end of the anti-tilt sleeve has an anti-tilt hole matched with the diameter of the end of the second gear to be tested, and the anti-tilt hole extends inwardly to the positioning column; the distance from the position of the tapered tip 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 is less than the length of the end shaft segment of the gear to be tested.

[0014] In this way, the anti-tilting sleeve is matched on the positioning column, the anti-tilting hole at the end extends to the positioning column, the cone tip is completely in the anti-tilting hole, and the distance from the position on the cone tip which is consistent with the hole diameter of the central hole of the gear end to the outer end of the anti-tilting sleeve is less than the length of the end shaft section of the gear to be detected, so that the end of the gear to be detected can be reliably abutted on the cone tip when the gear to be detected is matched with the cone tip, and the end of the gear to be detected can be reliably abutted on the cone tip.

[0015] Further, one end of the second gear to be detected has an internal spline, and the second gear clamping mechanism comprises a spline head matched with the internal spline on the second gear to be detected.

[0016] Further, the first driving loading mechanism comprises a top plate and a bottom plate, the bottom plate is fixedly arranged below the top plate through a support, the top plate is provided with a bearing seat arranged vertically, the bearing seat comprises a cylindrical shell and a main shaft rotatably penetrating the shell through a bearing, the upper end of the main shaft penetrates the shell and is connected with the first gear clamping mechanism, the lower end of the main shaft penetrates the top plate and is connected with a torque sensor through a first coupling, the bottom plate is provided with a loading motor coaxially arranged with the main shaft below, the output shaft of the loading motor penetrates the bottom plate upwardly and is connected with the other end of the torque sensor through a second coupling, and the lower end of the main shaft is provided with a coaxially arranged circular grating.

[0017] Further, the end of the main shaft is provided with a first centering hole coaxially arranged, and the diameter of the first centering hole gradually increases from inside to outside; the first gear clamping mechanism comprises a top center body in an overall cylindrical shape, one end of the top center body is provided with a first centering sleeve protrudingly arranged, the outer diameter of the first centering sleeve gradually decreases in the direction away from the top center body, and the taper is consistent with the taper of the first centering hole; the first centering sleeve is coaxially matched in the first centering hole, and the first gear clamping mechanism and the main shaft are provided with a fastening structure.

[0018] Further, the end of the first centering sleeve is provided with a first positioning groove arranged through in the radial direction; the first centering hole is provided with a positioning block protrudingly formed inwardly in the radial direction, the width of the positioning block is matched with the width of the first positioning groove and is matched in the first positioning groove.

[0019] In summary, the present application has the advantages of reasonable structure design, can simulate the running of gear pairs, has high clamping efficiency, is convenient to operate and use, and is favorable for improving detection accuracy. BRIEF DESCRIPTION OF DRAWINGS

[0020] Fig. 1 is a schematic diagram of the overall structure of the gear pair ghost frequency noise detection station of the present embodiment.

[0021] Fig. 2 is a schematic diagram of the overall structure of the first drive loading assembly in Fig. 1.

[0022] Fig. 3 is a schematic diagram of the overall structure of the second drive loading assembly in Fig. 1.

[0023] Fig. 4 is a schematic diagram of the cross-sectional structure of the gear pair.

[0024] Fig. 5 is a schematic diagram of the exploded structure of the second top clamping mechanism.

[0025] Fig. 6 is a schematic diagram of the exploded structure of the second gear clamping mechanism.

[0026] Fig. 7 is a schematic diagram of the structure of the drive shaft.

[0027] Fig. 8 is a schematic diagram of the cross-sectional structure of the second top clamping mechanism and the second gear clamping mechanism.

[0028] Fig. 9 is a schematic diagram of the structure of the first drive loading mechanism.

[0029] Fig. 10 is a schematic diagram of the cross-sectional structure of the first drive loading mechanism.

[0030] Fig. 11 is a schematic diagram of the cross-sectional structure of the first coupling.

[0031] Fig. 12 is a schematic diagram of the exploded structure of the first coupling.

[0032] Fig. 13 is a schematic diagram of the cross-sectional structure of the bearing seat.

[0033] Fig. 14 is a schematic diagram of the structure of the first gear clamping mechanism.

[0034] Fig. 15 is a schematic diagram of the exploded structure of the first gear clamping mechanism and the transmission spline sleeve.

[0035] Fig. 16 is a schematic diagram of the cross-sectional structure of the first gear clamping mechanism and the transmission spline sleeve.

[0036] Fig. 17 is a schematic diagram of the structure of the transmission spline sleeve.

[0037] Fig. 18 is another schematic diagram of the structure of the transmission spline sleeve. DETAILED DESCRIPTION

[0038] The present application will be further described in detail below in conjunction with the embodiments.

[0039] In particular implementation: a gear pair ghost frequency noise detection station, as shown in Figures 1-3, comprising a base 1, a first driving loading assembly 2 and a second driving loading assembly 3 arranged on the base 1, the first driving loading assembly 2 comprising a first vertical column 21 vertically arranged on the base 1, a first top clamping mechanism 22 vertically movably arranged downward on the first vertical column 21, the first top clamping mechanism 22 having a coaxial first driving loading mechanism 23 arranged upward below, the output end of the first driving loading mechanism 23 having a first gear clamping mechanism 4 for coaxial transmission connection of a first gear to be tested; the second driving loading assembly 3 comprising a second vertical column 31, the bottom of the second vertical column 31 being movably arranged on the base 1 through a first linear driving mechanism 32 extending toward the first driving loading assembly 2; the second vertical column 31 having a coaxial second driving loading mechanism 33 and a second top clamping mechanism 34 arranged opposite in vertical direction on one side of the second vertical column 31, the output end of the second driving loading mechanism 33 being downwardly connected with a second gear clamping mechanism 5 for coaxial transmission connection of a second gear to be tested, and the second driving loading mechanism 33 being movably arranged on the second vertical column 31 through a second linear driving mechanism 35 arranged vertically.

[0040] With the above structure, the output end of the second driving loading mechanism is downward, and the output end of the first driving loading mechanism is upward, so that the second driving loading mechanism and the first driving loading mechanism are arranged at opposite ends of the gear pair to be tested in the axial direction, the interference space of the second driving loading assembly and the first driving loading assembly in the radial direction is reduced, and the minimum axial center distance of the two can be reduced, so as to be applicable to gear pairs with small axial center distance, as shown in Figure 1. Before testing, the second vertical column is moved away from the first driving loading assembly, the second gear to be tested is vertically placed between the second top clamping mechanism and the second gear clamping mechanism, the second driving loading mechanism is moved to complete 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, the first top clamping mechanism is moved to complete clamping of the first gear to be tested; the second vertical column is moved toward the first driving loading assembly to complete meshing of the second gear to be tested and the first gear to be tested, forming a gear pair; driving and load are applied to the gear pair by the first driving loading mechanism and the second driving loading mechanism respectively, so that the running of the gear pair under load can be simulated. The above structure can detect a pair of gear pairs, and compared with single gear detection, the accuracy of detection can be improved.

[0041] In the embodiment, the first top clamping mechanism 22 is movably arranged on the first vertical column 21 through a third linear driving mechanism 24 arranged vertically, and the second top clamping mechanism 34 is movably arranged on the second vertical column 31 through a fourth linear driving mechanism 36 arranged vertically.

[0042] For different types of gear pairs, the vertical clamping of the first gear to be tested on the first gear clamping mechanism will have different heights of the meshing position of the gear pair due to the unchanged height of the lower end position. Since the second clamping mechanism and the second driving loading mechanism can move vertically, the second driving loading assembly can adjust the second clamping mechanism and the second driving 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 more types of gear pairs.

[0043] Specifically, the first linear driving mechanism 32, the second linear driving mechanism 35, the third linear driving mechanism 24 and the fourth linear driving mechanism 36 each include two parallel linear guides, a supporting plate movably arranged on the two linear guides through a sliding block, a ball screw mechanism arranged in parallel between the two linear guides, one end of the ball screw mechanism connected with a motor, and the supporting plate mounted on a screw nut of the ball screw mechanism through bolts; a clamp is arranged on the linear guide, and the supporting plate is connected with the clamp. The second column 31, the second driving loading mechanism 33, the first clamping mechanism 22 and the second clamping mechanism 34 are respectively mounted on the corresponding supporting plates.

[0044] In this way, the supporting plate can be reliably stopped at a fixed position by the clamp, so that the gear pair can run more stably, thereby facilitating the improvement of the accuracy and reliability of the detection.

[0045] Generally, the shaft ends of the two gears on the gear pair each have an end center hole, and in this embodiment, one end of one gear has an internal spline, as shown in FIG. 4. The first clamping mechanism 22 and the second clamping mechanism 34 each include a vertically arranged taper sleeve seat 61 and a rotary center 62, the rotary center 62 including a cylindrical body 621, one end of the body 621 having a coaxially arranged centering rod 622, and the other end coaxially arranged with a tapered center 623; as shown in FIG. 5, the diameter of the centering rod 622 gradually decreases in the direction away from the body 621, one end of the taper sleeve seat 61 has a vertically arranged centering hole, the centering hole has the same taper as the centering rod 622, and the centering rod 622 is tightly coaxially fitted on the centering hole.

[0046] In the embodiment, the second top clamping mechanism 34 is vertically upwardly arranged, and the top tip has a taper, so that the second gear to be measured placed on the top tip is easy to fall down, and it is inconvenient to center the second gear clamping mechanism at the upper end. Therefore, the rotating top tip 62 of the second top clamping mechanism 34 comprises a positioning column coaxially connected to the body 1, and a taper tip is arranged at the end of the positioning column in a matched manner, and the maximum diameter of the taper tip is greater than the diameter of the end center hole of the second gear to be measured; a anti-falling sleeve 624 is matched on the positioning column, and the outer end of the anti-falling sleeve 624 has an anti-falling hole matched with the diameter of the end of the second gear to be measured, and the anti-falling hole extends inwardly to the positioning column; and the distance from the position on the taper tip consistent with the diameter of the end center hole of the gear to the outer end of the anti-falling sleeve 624 is less than the length of the end shaft section of the gear to be measured.

[0047] In this way, the anti-falling sleeve is matched on the positioning column, and the anti-falling hole at the end extends to the positioning column, so that the taper tip is completely in the anti-falling hole; at the same time, the distance from the position on the taper tip consistent with the diameter of the end center hole of the gear to the outer end of the anti-falling sleeve 624 is less than the length of the end shaft section of the gear to be measured, so that it can be ensured that when the gear to be measured is matched with the taper tip, the end of the anti-falling sleeve does not interfere with the protruding part on the gear, and the end center hole of the second gear to be measured can reliably abut on the taper tip. At the same time, since the outer diameter of the anti-falling hole is matched with the diameter of the end of the gear to be measured, the gear can be kept standing, and falling down is avoided, so that the centering is facilitated and fast.

[0048] In the embodiment, the anti-falling sleeve 624 has a through positioning hole at one end thereof towards the body 1, the inner diameter of the positioning hole is matched with the outer diameter of the positioning column, and the positioning hole is sleeved on the positioning column, and the end of the anti-falling hole has a gradually increasing diameter guide part. In specific implementation, the anti-falling sleeve 624 and the positioning column can also adopt a threaded connection structure, for example, the positioning column has an external thread, and the anti-falling sleeve 624 has a through threaded hole at one end thereof towards the body 621, and is screwed on the positioning column.

[0049] In implementation, one end of the second gear to be measured has an internal spline, and the second gear clamping mechanism 5 comprises a spline head 51 matched with the internal spline on the second gear to be measured.

[0050] As shown in FIG. 6 and FIG. 8, 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. The one end of the centering shaft 53 towards the driving shaft 52 is provided with a spring cavity 531 arranged coaxially, and the bottom of the spring cavity 531 is provided with a transmission hole arranged coaxially and penetratively, and the transmission hole is provided with a guide structure arranged in the axial direction. The transmission hole is axially movably fitted with a transmission shaft 54, and the inner end of the transmission shaft 54 abuts against the driving shaft 52 with a spring 55 therebetween. 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.

[0051] In the embodiment, the guide mechanism is a spline arranged on the transmission hole, and the transmission shaft 54 is provided with an outer spline matched with the spline. The outer spline is arranged penetratively along the axial direction of the transmission shaft 54, and the inner end of the transmission shaft 54 is provided with an outer snap spring groove extending in the circumferential direction, and the outer snap spring groove is fitted with an outer snap spring stopper. The spline head 51 is coaxially provided with a spline hole matched with the outer spline, and the spline head 51 is detachably fitted on the outer 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 gear to be tested, so as to adapt to more models of gears for detection.

[0052] The spline hole is arranged penetratively on the spline head 51, and the one end of the spline hole towards the outside is provided with an inner snap spring groove extending in the circumferential direction and fitted with an inner snap spring stop ring. At the same time, the one end of the spline head 51 towards the outside gradually decreases in diameter to be in the shape of a circular truncated cone. In this way, the spline head can be better fitted with the internal spline of the gear to be tested by using the end of the circular truncated cone.

[0053] The one end of the centering shaft 53 towards the spline head 51 is provided with a top connecting section in the shape of a cone with gradually decreasing diameter, and the maximum diameter of the top connecting section is greater than the hole diameter of the end center hole of the second gear to be tested, and the minimum diameter is less than the hole diameter of the end center hole of the second gear to be tested. In this way, the top connecting section in the shape of a cone can be used to realize coaxial connection by fitting with the internal hole of the gear to be tested.

[0054] With the above structure, the second driving loading mechanism drives the spline head to slowly rotate during the process of slowly moving the spline head towards the internal spline of the gear to be tested. When the spline head abuts against 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 is rotated to the position matched with the internal spline, the transmission shaft and the internal spline are pushed out under the action of the spring, so as to complete the fitting of the spline head and the internal spline. This structure can avoid impact between the spline head and the internal spline, which can not only avoid damage to the equipment or parts, but also improve the fitting efficiency of the spline.

[0055] As shown in FIG. 6 and FIG. 7, the end of the driving shaft 52 has a coaxially arranged second centering hole 521, the diameter of which gradually increases from inside to outside; the end of the centering shaft 53 has a coaxially arranged second centering sleeve 532 protruding towards the end of the driving shaft 52, the outer diameter of which gradually decreases in the direction towards 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 arranged through in the radial direction; the second centering hole 521 has a second positioning block 522 protruding inward in the radial direction, the width of which matches the width of the second positioning groove 533 and is fitted in the second positioning groove 533.

[0056] The end of the driving shaft 52 has screw holes arranged uniformly along the circumference of the second centering hole 521; the centering shaft 53 has a second flange 534 protruding outward in the radial direction of the second centering sleeve 532, the second flange 534 has bolt holes arranged correspondingly with the screw holes, and the locking mechanism is a bolt connected through the bolt holes to the screw holes.

[0057] For the other gear on the gear pair, the first driving loading mechanism 23 includes a top plate 231 and a bottom plate 232, the bottom plate 232 is fixedly arranged below the top plate 231 through a support 233, the support 233 is a side plate arranged on both sides of the top plate 231, as shown in FIG. 9 and FIG. 10. 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 penetrating in the shell 2341 through a bearing, the upper end of the main shaft 2342 penetrates out of the shell 2341 and is connected with the first gear clamping mechanism 4; the lower end of the main shaft 2342 penetrates through the top plate 231 and is connected with a torque sensor 236 through a first coupling 235; the bottom plate 232 has a loading motor 237 coaxially arranged with the main shaft 2342 below, the output shaft of the loading motor 237 penetrates upwards through the bottom plate 232 and is connected with the other end of the torque sensor 236 through a second coupling 238; the lower end of the main shaft 2342 is installed with a coaxially arranged circular grating 239.

[0058] As shown in FIG. 11 and FIG. 12, the first coupling 235 comprises a taper sleeve flange 2351 sleeved on the main shaft 2342, the taper sleeve flange 2351 has a taper sleeve with a gradually decreasing outer diameter in a direction away from the torque sensor 236, the taper sleeve has a radial through groove; the taper sleeve is sleeved with a taper ring 2352, the inner hole of the taper ring 2352 has an inner taper surface consistent with the taper of the taper sleeve; the maximum inner diameter of the taper ring 2352 is smaller than the maximum outer diameter of the taper sleeve; the taper ring 2352 has first threaded holes uniformly distributed in the circumferential direction, the taper sleeve flange 2351 has counter-holes for the first threaded holes, and the taper sleeve flange 2351 is connected to the first threaded holes of the taper ring 2352 by fastening bolts.

[0059] The outer circular surface of the taper sleeve flange 2351 has a taper step formed by radially concave, the outer circular surface of the taper step has a taper matching the circular grating 239, and the circular grating 239 is coaxially fitted on the taper step; the taper sleeve flange 2351 has second threaded holes corresponding to the bolt holes on the circular grating 239, and the circular grating 239 is fixed on the taper sleeve flange 2351 by bolts.

[0060] As shown in FIG. 13, the shell 2341 has a flange plate 2346 protruding radially outward, and is installed on the top plate 231 by bolts. One end of the shell 2341 is provided with a first end cover 2347, and the other end is provided with a second end cover 2349, the first end cover 2347 and the second end cover 2349 both have a top sleeve protruding towards the shell 2341, the outer diameter of the top sleeve matches the inner diameter of the shell 2341, and abuts against the corresponding bearing outer ring; both ends of the shell 2341 have threaded holes distributed in the circumferential direction, the first end cover 2347 and the second end cover 2349 both have bolt holes corresponding to the threaded holes, and are installed on the shell 2341 by bolts. The inner diameter of the first end cover 2347 matches the outer diameter of the corresponding position of the main shaft 2342, and is clearance-fitted on the main shaft 2342; the inner wall of the first end cover 2347 has an annular groove extending in the circumferential direction, the bottom of the annular groove is provided with an inlet hole for connecting the positive pressure gas, and a pneumatic connector is installed on the inlet hole for convenient connection of the gas source.

[0061] In use, the air inlet hole is connected with the air source, and the positive pressure gas enters the annular groove through the air inlet hole to form a positive pressure. Since the first end cover and the main shaft are in clearance fit, the positive pressure gas in the annular groove blows out from the gap between the two, thereby avoiding the impurities staying or entering the housing from the gap between the main shaft and the second end cover, thereby slowing down or reducing the accumulation of impurities, and prolonging the service life of the bearing seat.

[0062] The inner spacer sleeve 2350 is sleeved on the main shaft 2342, and the two ends of the inner spacer sleeve 2350 abut on the inner rings of the bearings at the two ends, respectively. The outer spacer sleeve 2348 is embedded in the housing 2341, the inner diameter of the outer spacer sleeve 2348 is greater than the outer diameter of the inner spacer sleeve 2350, and the two ends abut on the outer rings of the bearings at the two ends, respectively. Specifically, the two ends of the main shaft 2342 each have two angular contact bearings installed in a back-to-back manner. The housing 2341 has a temperature measuring threaded hole penetrating in the radial direction, the temperature measuring threaded hole is provided with two temperature measuring threaded holes and is opposite to the bearings at the two ends, respectively, and a temperature sensor 2345 is installed on the temperature measuring threaded hole.

[0063] As shown in FIGS. 14-16, the end of the main shaft 2342 has a coaxially arranged first centering hole, the diameter of the first centering hole gradually increases from inside to outside; the first gear clamping mechanism 4 includes a top body 41 which is in the shape of a cylinder as a whole, one end of the top body 41 has a first centering sleeve 42 which is protruding, 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 the first gear clamping mechanism 4 and the main shaft 2342 are provided with a fastening structure. Through the cooperation of the outer taper surface of the first centering sleeve and the inner taper surface of the first centering hole, the first gear clamping mechanism can be quickly coaxially installed in the first centering hole of the driving shaft. For different models of gears to be tested, the first gear clamping mechanism can be replaced for testing.

[0064] The end of the first centering sleeve 42 has a first positioning groove 43 arranged through the radial direction; the first centering hole has a positioning block protruding inward in the radial direction, the width of the positioning block matches the width of the first positioning groove 43 and is fitted in the first positioning groove 43. Through the cooperation of the first positioning groove and the first positioning block, the torque can be better transmitted. The end of the main shaft 2342 has a third threaded hole arranged along the circumference of the first centering hole; the first gear clamping mechanism 4 has a first flange 44 protruding outward in the radial direction of the first centering sleeve 42, the first flange 44 has a bolt hole corresponding to the third threaded hole, and the fastening structure is a bolt connected to the third threaded hole through the bolt hole. The other end of the center body 41 has a top column 45 coaxially arranged, the top column 45 has a top joint 46, the diameter of the top joint 46 gradually decreases away from the center body 41, the minimum diameter of the top joint is smaller than the diameter of the center hole of the end of the gear to be measured, and the maximum diameter is greater than the diameter of the center hole of the end of the gear to be measured.

[0065] As shown in Figure 4, the lower end of the gear on the right side of the gear pair does not have an inner spline or an outer spline, so the first driving load mechanism 23 cannot apply a load to it. Therefore, the present embodiment also provides a transmission spline sleeve 7, as shown in Figure 17, which includes a sleeve body 71 in the shape of a cylinder, one end of the sleeve body 71 is coaxially provided with a shaft hole 72 matching the diameter of the shaft end of the gear to be measured, a clamping mechanism 73 for reducing the hole diameter is arranged at the shaft hole 72, so that the minimum hole diameter of the shaft hole 72 is smaller than the diameter of the shaft end of the gear to be measured; the other end of the sleeve body 71 has an outer spline 74 protruding outward on the outer circular surface. In the present embodiment, the end of the sleeve body 71 away from the outer spline 74 has a semicircular ring 711 extending in the axial direction, the clamping mechanism 73 includes a semicircular clamping ring, the inner diameter of the clamping ring and the inner diameter of the semicircular ring 711 are equal to the diameter of the shaft end of the gear to be measured, the clamping ring and the semicircular ring 711 are directly opposite and spliced to form the shaft hole 72, and the opposite sides of the two have a gap; the two ends of the clamping ring have bolt holes arranged through the semicircular ring 711, the semicircular ring 711 has a threaded hole corresponding to the bolt hole, and the clamping ring is connected to the threaded hole of the semicircular ring 711 through the bolt passing through the bolt hole. Because there is a gap between the clamping 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 the bolt is forced, the clamping ring will continuously approach the semicircular ring, thereby clamping the shaft end of the gear to be measured.

[0066] In actual implementation, a hydraulic clamping mechanism can also be used, as shown in FIG. 18. The clamping mechanism 73 includes an annular pressure cavity 731 provided through the sleeve 71 in a circumferential direction at an end of the sleeve 71 away from the external spline 74. A side wall between the annular pressure cavity 731 and the shaft hole 72 forms a deformable expansion sleeve wall 732. The sleeve 71 has a cylindrical piston cavity 733, and a piston 734 is fitted in the piston cavity 733. The piston cavity 733 is connected to the annular pressure cavity 731 through an oil channel and filled with hydraulic oil. The outer end side wall of the piston cavity 733 is provided with a thread, and a locking bolt 735 is fitted in the thread and abuts against the piston 734.

[0067] The top end portion 46 has a guide rod coaxially provided thereon, and the end of the guide rod has a guide block 48 formed in a 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 is gradually reduced in a circular truncated cone shape. As shown in FIG. 16, the guide block on the guide rod can be fitted in the inner hole of the gear to be measured, and used for assisting centering. The top end body 41 is drivingly connected to a transmission sleeve 47 coaxially provided at one end of the top column 45. The end of the transmission sleeve 47 away from the top end body 41 is provided with an internal spline, which is used for being fitted with the external spline on the gear to be measured.

[0068] The above description is only the preferred embodiment of the present application, and is not intended to limit the present application. Any modification, equivalent replacement and improvement within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A gear pair ghost noise detection station, characterized in that, The utility model provides a first driving loading assembly (2) and a second driving loading assembly (3) are arranged on the base (1), the first driving loading assembly (2) includes the first stand (21) vertically arranged on the base (1), the first stand (21) is vertically movably arranged with the first top chucking mechanism (22) downward, the first top chucking mechanism (22) has coaxially arranged first driving loading mechanism (23) upward below, the output end of first driving loading mechanism (23) has the first gear clamping mechanism (4) for coaxial transmission connection to be measured first gear, the second driving loading assembly (3) includes the second stand (31) vertically arranged, the bottom of second stand (31) is movably arranged on the base (1) through the first linear drive mechanism (32) arranged and extended towards the first driving loading assembly (2), the side of second stand (31) towards the first driving loading assembly (2) has coaxially arranged second driving loading mechanism (33) and second top chucking mechanism (34) vertically opposite, the output end of second driving loading mechanism (33) is downwardly connected with the second gear clamping mechanism (5) for coaxial transmission connection to be measured second gear, and is movably arranged on the second stand (31) through the second linear drive mechanism (35) vertically arranged.

2. The gear pair ghost noise detection station of claim 1, wherein, The first top chucking mechanism (22) is movably arranged on the first stand (21) through the third linear drive mechanism (24) vertically arranged, and the second top chucking mechanism (34) is movably arranged on the second stand (31) through the fourth linear drive mechanism (36) vertically arranged.

3. The gear pair ghost noise detection station of claim 2, wherein, 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) all include two parallel linear guides, and the two linear guides movably support a supporting plate through a sliding block; the second stand (31), the second driving loading mechanism (33), the first top chucking mechanism (22) and the second top chucking mechanism (34) are respectively installed on the corresponding supporting plate.

4. The gear pair ghost noise detection station of claim 3, wherein, The linear guide is provided with a clamp, and the supporting plate is connected with the clamp.

5. The gear pair ghost noise detection station according to claim 1 or 2, wherein, The first top chucking mechanism (22) and the second top chucking mechanism (34) all include a vertically arranged taper sleeve seat (61) and a rotary center (62), the rotary center (62) includes a cylindrical body (621), one end of the body (621) is provided with a coaxial centering rod (622), and the other end is provided with a tapered center (623) coaxially; one end of the taper sleeve seat (61) is provided with a vertically arranged centering hole, and the centering rod (622) is coaxially fitted on the centering hole.

6. The gear pair ghost noise detection station of claim 5, wherein, The rotating top center (62) of the second top clamping mechanism (34) comprises a positioning column coaxially connected to the body (1), and a tapered tip is arranged at the end of the positioning column in a connecting manner, wherein the maximum diameter of the tapered tip is greater than the diameter of the end center hole of the second gear to be measured; a anti-tilt sleeve (624) is matched with the positioning column, and the outer end of the anti-tilt sleeve (624) has an anti-tilt hole matched with the diameter of the end of the second gear to be measured, and the anti-tilt hole extends inward to the positioning column; the distance from the position of the tapered tip 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 (624) is less than the length of the end shaft section of the gear to be measured.

7. The gear pair ghost noise detection station of claim 6, wherein, One end of the second gear to be measured has internal splines, and the second gear clamping mechanism (5) comprises a spline head (51) matched with the internal splines on the second gear to be measured.

8. The gear pair ghost noise detection station of claim 1 or 2, wherein, The first driving loading mechanism (23) comprises a top plate (231) and a bottom plate (232), the bottom plate (232) is fixedly arranged below the top plate (231) through a support (233), the top plate (231) is provided with a bearing seat (234) arranged vertically, the bearing seat (234) comprises a cylindrical shell (2341) and a main shaft (2342) rotatably penetrating the shell (2341) through a bearing, the upper end of the main shaft (2342) penetrates the shell (2341) and is connected with the first gear clamping mechanism (4), the lower end of the main shaft (2342) penetrates the top plate (231) and is connected with a torque sensor (236) through a first coupling (235), the bottom plate (232) is provided with a loading motor (237) arranged coaxially with the main shaft (2342) below, the output shaft of the loading motor (237) penetrates the bottom plate (232) upwardly and is connected with the other end of the torque sensor (236) through a second coupling (238), and the lower end of the main shaft (2342) is provided with a coaxially arranged circular grating (239).

9. The gear pair ghost noise detection station of claim 8, wherein, The end of the main shaft (2342) is provided with a first centering hole arranged coaxially, and the diameter of the first centering hole gradually increases from inside to outside; the first gear clamping mechanism (4) comprises a top center body (41) in the shape of a cylinder as a whole, one end of the top center body (41) is provided with a first centering sleeve (42) protruding outward, the outer diameter of the first centering sleeve (42) gradually decreases in the direction away from the top center body (41), and the taper is consistent with the taper of the first centering hole; the first centering sleeve (42) is coaxially matched 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 noise detection station of claim 9, wherein, The end of the first centering sleeve (42) is provided with a first positioning groove (43) arranged through in the radial direction; the first centering hole is provided with a positioning block protruding inward in the radial direction, the width of the positioning block is matched with the width of the first positioning groove (43) and is matched in the first positioning groove (43).

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