Loading mechanism for gear pair ghost frequency noise detection

Abstract

The utility model discloses a loading mechanism for gear pair ghost frequency noise detection, which comprises a top plate and a bottom plate, the bottom plate is fixedly arranged below the top plate through a supporting piece, and the top plate is provided with a vertically arranged bearing seat. The bearing seat comprises a cylindrical shell and a main shaft rotatably arranged on the shell in a penetrating mode through a bearing, and the upper end of the main shaft penetrates out of the shell and forms a driving end used for being coaxially connected with a gear to be tested; the lower end of the main shaft penetrates through the top plate and is connected with a torque sensor through a first coupler. A loading motor coaxially arranged with the main shaft is arranged below the bottom plate, and an output shaft of the loading motor upwards penetrates through the bottom plate and is connected with the other end of the torque sensor through a second coupler; and the lower end of the main shaft is provided with a circular grating which is coaxially arranged. The device has the advantages of being reasonable in structural design, capable of applying a stable and reliable load, beneficial to guaranteeing the accuracy of a detection result and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of gear detection, in particular to a loading mechanism for detecting ghost frequency noise of a gear pair. Background Art

[0002] During the manufacturing process, the tooth surfaces of gear pairs are affected by factors such as processing and manufacturing, which introduce additional errors. This causes the gear pairs to be stimulated by the meshing force during the meshing transmission process and produce additional vibration noise. In traditional fuel vehicles, the noise from the engine and other components will mask the noise between the gear pairs. However, in new energy electric vehicles, due to the low operating noise of the motor itself, the noise of the gear pairs will be extremely obvious, seriously affecting the comfort of the entire vehicle. To this end, it is necessary to perform noise testing on the gear pairs during the off-line manufacturing stage. The two gears of the gear pair are clamped on the testing equipment at the same time, one of the gears is driven to rotate, and a load is applied to the other gear. To accurately detect the ghost frequency noise of the gear pair, a reliable and stable load needs to be applied. Therefore, how to apply a stable and reliable load has become an urgent problem to be solved. Utility Model Content

[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 loading mechanism with a reasonable structural design, which can apply a stable and reliable load and is conducive to ensuring the accuracy of the detection results.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A loading mechanism for detecting ghost noise of a gear pair, comprising a top plate and a bottom plate, wherein the bottom plate is fixedly arranged below the top plate by a support member, and a vertically arranged bearing seat is provided on the top plate, and the bearing seat comprises a cylindrical shell and a main shaft rotatably passed through the shell through a bearing, the upper end of the main shaft passes through the shell and forms a driving end for coaxially connecting to the gear to be tested; 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, and the output shaft of the loading motor passes upward through the bottom plate 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.

[0006] In this structure, a torque sensor is coaxially connected between the spindle and the drive motor to detect the output torque of the loading motor, thereby achieving more stable and reliable torque output. Simultaneously, a circular grating is installed at the lower end of the spindle to accurately measure the spindle's rotational speed.

[0007] Furthermore, the first coupling includes a tapered sleeve flange sleeved on the main shaft, the tapered sleeve flange having a tapered sleeve whose outer diameter gradually decreases in the direction away from the torque sensor, and the tapered sleeve having a radially penetrating groove; a tapered ring is sleeved on the tapered sleeve, and the inner hole of the tapered ring has an inner conical surface consistent with the taper of the tapered sleeve; the maximum inner diameter of the tapered ring is smaller than the maximum outer diameter of the tapered sleeve; the tapered ring has first threaded holes uniformly distributed along the circumferential direction, and the tapered sleeve flange has countersunk bolt holes corresponding to the first threaded holes, and is connected to the first threaded holes of the tapered ring by fastening bolts.

[0008] In this way, since the maximum inner diameter of the tapered ring is smaller than the maximum outer diameter of the tapered sleeve, the tapered sleeve moves toward the tapered sleeve flange under the axial tension of the fastening bolts, and squeezes the tapered sleeve through the inner conical surface, so that the tapered sleeve is coaxially connected to the main shaft.

[0009] Furthermore, the outer circular surface of the tapered sleeve flange has a tapered step formed inwardly in the radial direction, the outer circular surface of the tapered step has a taper matching the circular grating, and the circular grating is coaxially fitted on the tapered step; the tapered sleeve flange has a second threaded hole arranged corresponding to the bolt hole on the circular grating, and the circular grating is fixed to the tapered sleeve flange by bolts.

[0010] Furthermore, the driving end of the main shaft has a coaxially arranged centering hole, and the diameter of the centering hole gradually increases from the inside to the outside; it also includes a top, which includes a top body that is generally cylindrical, and one end of the top body has a protruding centering sleeve, and the outer diameter of the centering sleeve gradually decreases in the direction away from the top body, and the taper is consistent with the taper of the centering hole; the centering sleeve is coaxially fitted in the centering hole, and a fastening structure is provided between the top and the main shaft.

[0011] In this way, the outer cone of the centering sleeve cooperates with the inner cone of the centering hole, so that the center can be quickly and coaxially installed in the centering hole of the drive shaft. For different models of gears to be tested, the center can be replaced and tested.

[0012] Furthermore, the end of the centering sleeve has a positioning groove that is arranged to pass through in the radial direction; the centering hole has a positioning block that protrudes radially inward, and the width of the positioning block matches the width of the positioning groove and fits in the positioning groove.

[0013] In this way, the torque can be better transmitted through the cooperation of the positioning groove and the positioning block.

[0014] Furthermore, the end of the main shaft has third threaded holes evenly distributed along the circumference of the centering hole; the top has a flange protruding radially outward along the centering sleeve, and the flange has bolt holes corresponding to the third threaded holes, and the fastening structure is a bolt passing through the bolt hole and connected to the third threaded hole.

[0015] Furthermore, the other end of the top body has a coaxially arranged top column, and the top column has a top connecting portion, the diameter of the top connecting portion gradually decreases in the direction away from the top body, the minimum diameter of the top connecting 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.

[0016] Furthermore, a first end cover is provided at one end of the shell; the inner diameter of the first end cover matches the outer diameter of the corresponding position on the main shaft, and is loosely fitted on the main shaft; the inner wall of the first end cover 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.

[0017] During use, the air inlet is connected to an air source, and positive pressure gas enters the annular groove through the air inlet, generating positive pressure. Since there is a clearance fit between the first end cover and the main shaft, the positive pressure gas in the annular groove is blown outward from the gap between the two, thereby preventing impurities from accumulating in the gap between the main shaft and the second end cover or entering the housing. This can slow down or reduce the accumulation of impurities and help extend the service life of the bearing seat.

[0018] Furthermore, the shell has a flange protruding radially outward and is mounted on the top plate by bolts.

[0019] In summary, the utility model has the advantages of reasonable structural design, the ability to apply stable and reliable loads, and the ability to ensure the accuracy of detection results. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of the structure of the loading mechanism of this embodiment.

[0021] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure.

[0022] Figure 3 Schematic diagram of the cross-sectional structure of the bearing seat.

[0023] Figure 4 It is a schematic diagram of the cross-sectional structure of the first coupling.

[0024] Figure 5 Schematic diagram of the exploded structure of the first coupling.

[0025] Figure 6 A schematic diagram of the top structure.

[0026] Figure 7 It is a structural diagram of the center and the main shaft.

[0027] Figure 8 It is a schematic diagram of the cross-sectional structure of the gear and the center. DETAILED DESCRIPTION

[0028] The present invention will be further described in detail below with reference to the embodiments.

[0029] When implementing: Figures 1 to 8 As shown, a loading mechanism for detecting ghost noise of a gear pair includes a top plate 1 and a bottom plate 2. The bottom plate 2 is fixedly arranged below the top plate 1 through a support member 3. In this embodiment, the support member 3 is a side plate arranged on both sides of the top plate 1.

[0030] The top plate 1 has a vertically arranged bearing seat 4, and the bearing seat 4 includes a cylindrical shell 41 and a main shaft 42 rotatably inserted into the shell 41 through a bearing. The upper end of the main shaft 42 passes through the shell 41 and forms a driving end for coaxially connecting to the gear to be measured; the lower end of the main shaft 42 passes through the top plate 1 and is connected to a torque sensor 6 through a first coupling 5; a loading motor 7 coaxially arranged with the main shaft 42 is provided below the bottom plate 2, and the output shaft of the loading motor 7 passes through the bottom plate 2 upward and is connected to the other end of the torque sensor 6 through a second coupling 8; a coaxially arranged circular grating 9 is installed at the lower end of the main shaft 42, and the reading head of the circular grating 9 is installed on the support 3.

[0031] like Figure 4 and Figure 5 As shown, the first coupling 5 includes a tapered sleeve flange 51 sleeved on the main shaft 41, and the tapered sleeve flange 51 has a tapered sleeve 53 whose outer diameter gradually decreases in the direction away from the torque sensor 6, and the tapered sleeve 53 has a radially penetrating groove 54; a tapered ring 52 is sleeved on the tapered sleeve 53, and the inner hole of the tapered ring 52 has an inner conical surface consistent with the taper of the tapered sleeve 53; the maximum inner diameter of the tapered ring 52 is smaller than the maximum outer diameter of the tapered sleeve 53; the tapered ring 52 has first threaded holes uniformly distributed along the circumferential direction, and the tapered sleeve flange 51 has countersunk bolt holes corresponding to the first threaded holes, and is connected to the first threaded holes of the tapered ring 52 by fastening bolts.

[0032] The outer circumferential surface of the tapered sleeve flange 51 has a tapered step 55 formed inwardly in the radial direction. The outer circumferential surface of the tapered step 55 has a taper that matches the circular grating 9. The circular grating 9 is coaxially fitted on the tapered step 55. The tapered sleeve flange 51 has a second threaded hole corresponding to the bolt hole on the circular grating 9. The circular grating 9 is fixed to the tapered sleeve flange 51 by bolts.

[0033] like Figure 3 As shown, the housing 41 has a radially outwardly protruding flange 411, which is bolted to the top plate 1. A first end cap 412 is provided at one end of the housing 41, and a second end cap 414 is provided at the other end. Both the first and second end caps 412 and 414 have top sleeves protruding toward the housing 41. The outer diameters of these sleeves match the inner diameter of the housing 41 and abut against the corresponding bearing outer rings. Threaded holes are circumferentially distributed at both ends of the housing 41. Both the first and second end caps 412 and 414 have bolt holes corresponding to the threaded holes and are bolted to the housing 41. The inner diameter of the first end cap 412 matches the outer diameter of the corresponding positions on the main shaft 42, providing a clearance fit thereon. A circumferentially extending annular groove is formed on the inner wall of the first end cap 412. An inlet for positive-pressure gas is provided at the bottom of the annular groove. To facilitate connection to the gas source, a pneumatic connector is mounted on the inlet.

[0034] During use, the air inlet is connected to an air source, and positive pressure gas enters the annular groove through the air inlet, generating positive pressure. Since there is a clearance fit between the first end cover and the main shaft, the positive pressure gas in the annular groove is blown outward from the gap between the two, thereby preventing impurities from accumulating in the gap between the main shaft and the second end cover or entering the housing. This can slow down or reduce the accumulation of impurities and help extend the service life of the bearing seat.

[0035] The spindle 42 is fitted with an inner spacer 421, with its ends abutting the inner races of the bearings at either end. An outer spacer 413 is embedded within the housing 41. The inner diameter of the outer spacer 413 is larger than the outer diameter of the inner spacer 421, and its ends abut the outer races of the bearings at either end. Specifically, each end of the spindle 42 has two angular contact bearings mounted in opposite directions. The housing 41 has two threaded temperature measuring holes extending radially through it, each aligning with the bearings at either end. Temperature sensors 45 are mounted on each of these threaded holes.

[0036] like Figure 7As shown, the driving end of the spindle 42 has a coaxially arranged centering hole, and the diameter of the centering hole gradually increases from the inside to the outside; it also includes a tip 10, and the tip 10 includes a tip body 101 that is generally cylindrical, and one end of the tip body 101 has a protruding centering sleeve 102, and the outer diameter of the centering sleeve 102 gradually decreases in the direction away from the tip body 101, and the taper is consistent with the taper of the centering hole; the centering sleeve 102 is coaxially fitted in the centering hole, and a fastening structure is provided between the tip 10 and the spindle 42. The outer conical surface of the centering sleeve is matched with the inner conical surface of the centering hole, so that the tip can be quickly and coaxially installed in the centering hole of the drive shaft. For different models of gears to be tested, they can be tested by replacing the tip.

[0037] The end of the centering sleeve 102 has a radially extending positioning groove 103. A positioning block protrudes radially inward within the centering hole. The width of the positioning block matches the width of the positioning groove 103 and fits within the positioning groove 103. The cooperation between the positioning groove and the positioning block ensures better torque transmission. The end of the main shaft 42 has third threaded holes evenly distributed along the circumference of the centering hole. The tip 10 has a flange 104 protruding radially outward from the centering sleeve 102. The flange 104 has bolt holes corresponding to the third threaded holes. The fastening structure is a bolt that passes through the bolt holes and connects to the third threaded holes. The other end of the tip body 101 has a coaxially arranged top post 105. The top post 105 has a connecting portion 106. The diameter of the connecting portion 106 gradually decreases as it moves away from the tip body 101. The minimum diameter of the connecting 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.

[0038] During implementation, the top connection portion 106 has a coaxially arranged guide rod, the end of which has a guide block 108 protruding radially. The diameter of the guide block 108 is consistent with the inner diameter of the gear to be measured, and the end of the guide block 108 gradually decreases in diameter to form a truncated cone. Figure 8 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 alignment. The end of the tip body 101 facing the top column 105 is connected to a coaxial transmission sleeve 107. The end of the transmission sleeve 107 facing away from the tip body 101 is provided with an internal spline, which is used to cooperate with the external spline on the gear to be measured.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A loading mechanism for detecting ghost noise in a gear pair, characterized in that: The invention comprises a top plate (1) and a bottom plate (2), wherein the bottom plate (2) is fixedly arranged below the top plate (1) through a support member (3), and a vertically arranged bearing seat (4) is provided on the top plate (1), wherein the bearing seat (4) comprises a cylindrical shell (41) and a main shaft (42) rotatably passed through the shell (41) through a bearing, wherein the upper end of the main shaft (42) passes through the shell (41) and forms a driving end for coaxially connecting to a gear to be measured; the lower end of the main shaft (42) passes through the top plate (1) and is connected to a torque sensor (6) through a first coupling (5); a loading motor (7) is provided below the bottom plate (2) and is coaxially arranged with the main shaft (42), wherein the output shaft of the loading motor (7) passes through the bottom plate (2) upward and is connected to the other end of the torque sensor (6) through a second coupling (8); and a coaxially arranged circular grating (9) is installed on the lower end of the main shaft (42).

2. The loading mechanism for detecting ghost noise of a gear pair according to claim 1, characterized in that: The first coupling (5) includes a tapered sleeve flange (51) sleeved on the main shaft (42), the tapered sleeve flange (51) having a tapered sleeve with an outer diameter gradually decreasing in a direction away from the torque sensor (6), and the tapered sleeve having a groove extending through the tapered sleeve in a radial direction; a tapered ring (52) is sleeved on the tapered sleeve, the inner hole of the tapered ring (52) having an inner conical surface consistent with the taper of the tapered sleeve; the maximum inner diameter of the tapered ring (52) is smaller than the maximum outer diameter of the tapered sleeve; the tapered ring (52) has first threaded holes uniformly distributed along the circumferential direction, the tapered sleeve flange (51) has countersunk bolt holes corresponding to the first threaded holes, and is connected to the first threaded holes of the tapered ring (52) by fastening bolts.

3. The loading mechanism for detecting ghost noise of a gear pair according to claim 2, characterized in that: The outer circumferential surface of the tapered sleeve flange (51) is provided with a tapered step formed inwardly along the radial direction, the outer circumferential surface of the tapered step has a taper matching the circular grating (9), and the circular grating (9) is coaxially fitted on the tapered step; the tapered sleeve flange (51) is provided with a second threaded hole corresponding to the bolt hole on the circular grating (9), and the circular grating (9) is fixed to the tapered sleeve flange (51) by bolts.

4. The loading mechanism for detecting ghost noise of a gear pair according to claim 1, wherein: The driving end of the main shaft (42) has a coaxially arranged centering hole, and the diameter of the centering hole gradually increases from the inside to the outside; it also includes a top (10), the top (10) includes a top body (101) that is cylindrical as a whole, and one end of the top body (101) has a protruding centering sleeve (102), the outer diameter of the centering sleeve (102) gradually decreases in the direction away from the top body (101), and the taper is consistent with the taper of the centering hole; the centering sleeve (102) is coaxially fitted in the centering hole, and a fastening structure is provided between the top (10) and the main shaft (42).

5. The loading mechanism for detecting ghost noise of a gear pair according to claim 4, characterized in that: The end of the centering sleeve (102) has a positioning groove (103) that is radially through-set; the centering hole has a positioning block that protrudes radially inward, the width of the positioning block matches the width of the positioning groove (103) and fits in the positioning groove (103).

6. The loading mechanism for detecting ghost noise of a gear pair according to claim 4, characterized in that: The end of the main shaft (42) has third threaded holes uniformly distributed along the circumference of the centering hole; the top (10) has a flange (104) protruding outward along the radial direction of the centering sleeve (102), and the flange (104) has bolt holes corresponding to the third threaded holes, and the fastening structure is a bolt passing through the bolt hole and connected to the third threaded hole.

7. The loading mechanism for detecting ghost noise of a gear pair according to any one of claims 4 to 6, characterized in that: The other end of the top body (101) has a coaxially arranged top column (105), and the top column (105) has a top connection portion (106). The diameter of the top connection portion (106) gradually decreases in a direction away from the top body (101), and the minimum diameter of the top connection portion is smaller than the diameter of the center hole of the end of the gear to be measured, and the maximum diameter is larger than the diameter of the center hole of the end of the gear to be measured.

8. The loading mechanism for detecting ghost noise of a gear pair according to claim 1, wherein: A first end cover is provided at one end of the housing (41); the inner diameter of the first end cover matches the outer diameter of a corresponding position on the main shaft (42) and is loosely fitted on the main shaft (42); an annular groove extending in a circumferential direction is provided on the inner wall of the first end cover, and an air inlet hole for connecting positive pressure gas is provided through the bottom of the annular groove.

9. The loading mechanism for detecting ghost noise of a gear pair according to claim 1, wherein: The housing (41) has a flange protruding radially outward, and is mounted on the top plate (1) by means of bolts.

10. The loading mechanism for detecting ghost noise of a gear pair according to claim 1, wherein: The support member (3) is a side plate installed on both sides of the top plate (1).

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