NVH testing equipment

Abstract

The present invention relates to an NVH detection device, which is used in the NVH detection of a powertrain. The powertrain has a wheel hub at the end, and the outer side of the wheel hub has a plurality of docking holes or docking posts on a first circumference. The NVH detection device includes a workbench, a transfer device, a loading device, a laser distance measuring device and a detector. The loading device includes a drive shaft driven by a first motor. The laser distance measuring device detects in real time and makes the first motor and the second motor rotate synchronously in the same direction. The detector is used to perform NVH detection on the powertrain to be detected that is docked with the driving shaft of the loading device at the detection station. The advantage of the present invention is that it realizes the automation of docking or loosening the connection between the drive shaft and the docking hole or docking post of the wheel hub of the powertrain to be detected at the detection station, thereby realizing the automation of NVH detection.

Description

Technical Field

[0001] The present invention relates to the technical field of NVH detection, and in particular to an NVH detection device. Background Art

[0002] NVH is the abbreviation of Noise, Vibration and Harshness, which is a comprehensive issue to measure the quality of automobile manufacturing. Figure 1 When performing NVH testing, the output shaft of the loading device needs to be docked with the input end of the powertrain to provide power to the powertrain. At present, when performing this step, it is usually necessary to achieve docking by moving the loading device as a whole, which is not conducive to NVH testing of automobile powertrains. Therefore, the existing method needs to be further improved. Summary of the invention

[0003] The object of the present invention is to provide an NVH detection device which can automatically connect the output shaft of a loading device with the input end of a powertrain.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A NVH detection device is used in the NVH detection of a powertrain, wherein the powertrain has a wheel hub at an end, and the outer side surface of the wheel hub has a plurality of docking holes or docking posts on a first circumference, and is characterized in that the NVH detection device comprises: a workbench, a transfer device, a loading device, a laser ranging device and a detector, wherein the workbench has a first table surface and a second table surface; a rotating device is used to drive the workbench so that the first table surface and the second table surface of the workbench alternate between an adjustment station and a detection station; the loading device is arranged on a first machine base, and a first driving device is arranged on the first machine base; the loading device comprises a driving shaft extending toward the detection station and driven by a first motor to rotate around its central axis, and the first motor provides power for the powertrain to be detected; the first driving device is connected to the loading device to drive the loading device to move back and forth along the extension direction of the driving shaft, so as to dock or release the connection when the driving shaft moves to the docking hole or docking post of the wheel hub of the powertrain to be detected at the detection station; The laser distance measuring device is arranged on the first frame, and the first frame is provided with a second motor; the driving shaft of the second motor is coaxially arranged with the wheel hub of the power assembly at the adjustment position, and when the rotating device transfers the workbench to make the power assembly at the adjustment position turn to the detection position, the driving shaft of the first motor is coaxial with the wheel hub of the power assembly at the detection position; the second motor can drive the laser distance measuring device to rotate around the driving shaft of the second motor as the central axis, and the center of the laser beam of the laser distance measuring device falls on the first circumference, which is used to measure the distance between the laser distance measuring device and the obstacle encountered when the laser beam is emitted; when the outer side surface of the wheel hub is on the first circumference and has a plurality of docking holes, the distance measured by the laser distance measuring device is smaller than the distance measured by the laser distance measuring device. When the distance is set, the second motor drives the laser distance measuring device to rotate around the driving shaft of the second motor as the center axis until the distance measured by the laser distance measuring device is greater than the set distance, and the first motor and the second motor rotate synchronously in the same direction; when the outer side surface of the hub is on the first circumference and there are a plurality of docking columns, when the distance measured by the laser distance measuring device is greater than the set distance, the second motor drives the laser distance measuring device to rotate around the driving shaft of the second motor as the center axis until the distance measured by the laser distance measuring device is equal to the set distance, and the first motor and the second motor rotate synchronously in the same direction; the detector is used to perform NVH detection on the power assembly to be detected that is in the detection station and is docked with the driving shaft of the loading device.

[0006] The advantage of the present invention is that it realizes the automation of docking connection or loosening connection between the drive shaft and the docking hole or docking column of the wheel hub of the power assembly to be inspected at the inspection station, thereby realizing the automation of NVH inspection. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 Schematic diagram of the three-dimensional structure of the powertrain.

[0008] Figure 2It is a schematic diagram of the three-dimensional state structure of the NVH detection equipment in an embodiment of the present invention (the supporting device, fixing device and power assembly on the work surface are omitted).

[0009] Figure 3 It is a schematic diagram of the three-dimensional structure of the workbench in an embodiment of the present invention (the power assembly is omitted).

[0010] Figure 4 This is a schematic diagram of the three-dimensional structure of the workbench at another angle in an embodiment of the present invention (power assembly omitted).

[0011] Figure 5 for Figure 4 Schematic diagram of the enlarged state structure at I in the figure.

[0012] Figure 6 It is a schematic diagram of the three-dimensional structure of the workbench in an embodiment of the present invention (the power assembly is omitted).

[0013] Figure 7 Schematic diagram of the three-dimensional structure when the power assembly is fixed on the first table in an embodiment of the present invention.

[0014] Figure 8 Schematic diagram of the three-dimensional state structure on the first table in an embodiment of the present invention (power assembly omitted).

[0015] Fig. 9 Schematic diagram of the three-dimensional state structure of the loading device in an embodiment of the present invention (power assembly omitted).

[0016] Fig.10 It is a schematic diagram of the three-dimensional structure of some components of the loading device in an embodiment of the present invention when they are exploded.

[0017] Fig.11 for Fig. 9 A schematic diagram of a longitudinal cross-sectional structure of the components shown.

[0018] Fig.12 for Fig.11 AA section view in.

[0019] Fig.13 for Fig.11 Schematic diagram of the amplified state structure at II in the middle.

[0020] Fig.14 It is a schematic diagram of the three-dimensional state structure of the first motor output shaft through the coupling and the docking device in an embodiment of the present invention.

[0021] Fig.15 for Fig.14 Schematic diagram of the three-dimensional structure of the components in the exploded state. DETAILED DESCRIPTION

[0022] As attached Figure 1 As shown, the power assembly 100 has a wheel hub 101 at the end, specifically, the power assembly 100 has two wheel hubs 101 at the end, and a power output end 102 located between the two wheel hubs 101, and the outer side of the wheel hub 101 has a plurality of docking holes or docking columns on a first circumference.

[0023] As attached Figure 2 As shown, an NVH detection device is used in the NVH detection of a powertrain 100. The NVH detection device includes a workbench 1, a rotating device, a loading device, a laser distance measuring device 51 and a detector.

[0024] As attached Figure 2 To Attachment Figure 8 As shown, the workbench 1 has a first table surface 11 and a second table surface 12 , and the rotating device is used to drive the workbench 1 so that the first table surface 11 and the second table surface 12 of the workbench 1 alternate between the adjustment station 201 and the detection station 202 .

[0025] The workbench 1 can be rotatably mounted on the base, and a large gear 131 is fixedly provided on the lower end surface of the workbench 1. The rotating device is a rotating motor 132, and the rotating motor 132 drives a small gear 133 through a reduction gear box. The small gear 133 and the large gear 131 are meshed and transmitted to realize the first table surface 11 and the second table surface 12 of the workbench 1 alternate between the adjustment station 201 and the detection station 202.

[0026] The first table 11 and the second table 12 are each provided with a supporting device and a fixing device for installing and fixing the power assembly 100, and the supporting device includes a left supporting frame, a right supporting frame and a middle supporting frame. The left supporting frame and the right supporting frame are arranged at opposite ends of the table, and the middle supporting frame is located in the middle of the left supporting frame and the right supporting frame and deviates from the connection arrangement of the left supporting frame and the right supporting frame; the left supporting frame and the right supporting frame each include a sliding seat 141, a connecting block 142 and a limiting block 143 which are stacked and installed together from bottom to top, and the upper end surface of the limiting block 143 is formed with a V-shaped limiting groove 144, The sliding seat 141 is installed on a guide rail and connected to the driving shaft of a linear drive mechanism. Under the action of the linear drive mechanism, the sliding seat 141 can move back and forth along the guide rail; the fixing device includes a left fixing frame 151, a right fixing frame 152 and a middle fixing frame 153 which are arranged on the table surface corresponding to the left support frame, the right support frame and the middle support frame. When the power assembly 100 is placed on the supporting device, the fixing arms of the left fixing frame 151, the right fixing frame 152 and the middle fixing frame 153 are respectively pressed against the power assembly 100 to fix the power assembly 100 on the workbench 1.

[0027] The middle support frame includes a connecting block 161 and a limiting block 162 which are stacked and installed together from bottom to top. The upper end surface of the limiting block 162 is formed with a V-shaped limiting groove 163. The connecting block 161 is provided with a slide groove 164. An adjusting block 1641 is installed in the slide groove 164. The adjusting block 1641 is provided with a T-slot 165. The first table 11 and the second table 12 are each provided with a middle cylinder 166. The cylinder body of the middle cylinder 166 is installed on the first table 11 or the second table 12. The cylinder shaft of the middle cylinder is connected with a guide column 167. The guide column 167 is in an I-shape and is clamped and connected with the T-slot 165 and can slide along the length direction of the T-slot 165.

[0028] As attached Fig. 9 To Attachment Fig.15 As shown, the loading device is arranged on the first base, and the first base is provided with a first driving device. The loading device includes a driving shaft 311 extending toward the detection station 202 and driven by a first motor 31 to rotate around its central axis, and the first motor 31 provides power for the power assembly 100 to be detected. The first driving device is connected to the loading device to drive the loading device to move back and forth along the extension direction of the driving shaft, so as to dock or release the connection when the driving shaft moves to the docking hole or docking column of the wheel hub 101 of the power assembly 100 to be detected in the detection station 202.

[0029] Specifically, the first motor 31 is installed on the motor base 32, and the motor base 32 is provided with a guide block. The first base is extended toward the detection station 202 and provided with a guide rail. The guide block is slidably set on the guide rail and can slide along the guide rail. The first driving device includes a driving motor 331, a screw rod and a nut seat. The nut seat is fixedly connected to the guide block, and the screw rod and the nut seat are connected by threads. The output shaft of the driving motor 331 is connected to the screw rod. The forward and reverse rotation of the driving motor 331 drives the screw rod to move forward and reverse, so that the nut seat moves back and forth on the screw rod, thereby realizing the back and forth movement of the first base toward the detection station 202.

[0030] Details are as attached Figure 5 As shown, the laser distance measuring device 51 is arranged on the first frame 52, and the first frame 52 is provided with a second motor 53; the driving shaft of the second motor 53 is coaxially arranged with the hub 101 of the power assembly 100 at the adjusting station 201, when the rotating device transfers the workbench 1 to make the power assembly 100 at the adjusting station 201 turn to the detection station 202, by adjusting the height of the supporting device, the driving shaft of the first motor 31 is coaxial with the hub 101 of the power assembly 100 at the detection station 202; the second motor 53 can drive the laser distance measuring device 51 to rotate around the driving shaft of the second motor 53 as the central axis, and the center of the laser beam of the laser distance measuring device 51 falls on the first circumference, which is used to measure the distance between the laser distance measuring device 51 and the obstacle encountered when the laser beam is emitted.

[0031] When the outer side of the wheel hub 101 is on the first circumference and is a plurality of docking holes, when the distance measured by the laser distance measuring device 51 is less than the set distance, the second motor 53 drives the laser distance measuring device 51 to rotate around the driving shaft of the second motor 53 as the central axis until the distance measured by the laser distance measuring device 51 is greater than the set distance, and the first motor 31 and the second motor 53 rotate synchronously in the same direction; when the outer side of the wheel hub 101 is on the first circumference and is a plurality of docking columns, when the distance measured by the laser distance measuring device 51 is greater than the set distance, the second motor 53 drives the laser distance measuring device 51 to rotate around the driving shaft of the second motor 53 as the central axis until the distance measured by the laser distance measuring device 51 is equal to the set distance, and the first motor 31 and the second motor 53 rotate synchronously in the same direction. More specifically, the output shaft of the first motor 31 is also provided with an angular acceleration sensor, a torque sensor, a torque limiter and other necessary shaft system structures, and the angular acceleration sensor is used to collect the original information of the NVH test and the data of the torque sensor as a supplement to achieve more accurate docking.

[0032] The output shaft of the first motor 31 is docked with the docking connector 35 through a coupling 34. The front end surface of the docking connector 35 is concavely or convexly provided with a plurality of accommodating holes or accommodating columns corresponding to the docking holes or docking columns of the wheel hub 101. When the first motor 31 provides power for the power assembly 100 to be tested, the docking holes or docking columns of the wheel hub 101 dock with the corresponding accommodating columns or accommodating holes.

[0033] In this embodiment, the NVH detection equipment has two loading devices and a laser ranging device 51. With the rotation center axis of the workbench 1 as the center axis, the two loading devices and the laser ranging device 51 are distributed in a clockwise direction as a first laser ranging device, a second laser ranging device, a first loading device, and a second loading device; the driving shaft of the second motor 53 of the first laser ranging device is coaxial with the driving shaft of the second motor 53 of the second laser ranging device, the driving shaft of the first loading device is coaxial with the driving shaft of the second loading device, and the center axis of the wheel hub 101 of the powertrain 100 on the first table 11 and the second table 12 is coaxial with the driving shaft of the corresponding second motor 53 and the second loading device.

[0034] When the power assembly 100 on the first table 11 is fixed, the first motor 31 and the second motor 53 rotate synchronously in the same direction, and the first table 11 and the second table 12 alternate between the adjustment station 201 and the detection station 202, the power assembly 100 on the first table 11 is moved to the detection station 202. At this time, the center axis of the hub 101 of the power assembly 100 on the first table 11 will be coaxial with the drive shaft of the loading device. More specifically, the center axis of the left hub 101 of the power assembly 100 on the first table 11 will be coaxial with the drive shaft of the first loading device, and the center axis of the right hub 101 of the power assembly 100 on the first table 11 will be coaxial with the drive shaft of the second loading device. Because the first motor 31 and the second motor 53 rotate synchronously in the same direction, after the first table 11 and the second table 12 alternate between the adjustment station 201 and the detection station 202, the docking hole or docking column of the wheel hub 101 is just matched with the corresponding receiving column or receiving hole, and then under the action of the first driving device, the docking hole or docking column of the wheel hub 101 is docked in the corresponding receiving column or receiving hole, thereby realizing automatic docking connection. After the detection is completed, under the action of the first driving device, the docking hole or docking column of the wheel hub 101 is separated from the corresponding receiving column or receiving hole, thereby realizing automatic separation from each other.

[0035] A bearing tray 36 is also butt-connected between the coupling 34 and the docking device 35, and a bearing bracket 37 is provided on the first machine base corresponding to the bearing tray 36, and a bearing block that can slide up and down is provided on the bearing bracket 37, and a V-shaped bearing groove is formed on the upper top surface of the bearing block. The cylinder body of the horizontal cylinder is provided on the bearing bracket 37, and the cylinder shaft of the lifting cylinder is connected with a tilting block 381, and the tilting block 381 has an inclined surface, and an abutment column 382 is formed by extending downward from the bottom surface of the bearing block, and the abutment column 382 abuts on the inclined surface. Under the action of the lifting cylinder, the tilting block 381 moves forward and the abutment column 382 slides on the inclined surface, so that the bearing block can move up and down along the bearing bracket 37. When the first motor 31 provides power for the power assembly 100 to be tested, the bearing tray abuts in the V-shaped bearing groove of the bearing block to overcome the problem that the end of the first motor 31 may fall due to excessive couplings and docking devices being connected to it, resulting in the inability to align the central axis.

[0036] The loading device also includes a third motor 71 installed on the machine. The loading device includes a driving shaft extending toward the detection station 202 and driven by the third motor 71 to rotate around its central axis. The driving shaft of the third motor 71 is connected to the power output end 102 to provide power for the power assembly 100 to be detected; a second driving device is connected to the machine to drive the machine to move back and forth along the extension direction of the driving shaft, so as to connect or release the driving shaft when it moves to the power output end 102 of the power assembly 100 to be detected at the detection station 202.

[0037] The detector is used to perform NVH detection on the power assembly 100 to be detected which is at the detection station 202 and has been docked with the driving shaft of the loading device. The detector is an existing conventional NVH detection device and will not be described in detail here.

[0038] During use, the third motor 71 simulates the main shaft rotation of the vehicle under actual working conditions, and the first motors located on the left and right simulate the vehicle wheel end load at a low speed. During the test, the equipment collects and analyzes the test data through the sensors installed on the shaft system to determine the noise level of the main reduction. The design of the large-mass base can control its resonance frequency outside the test frequency range to maximize the effect of the NVH test. The equipment also provides an electrical cabinet for power distribution and data acquisition system. The NVH test bench is a fully automatic device that can realize automatic clamping and automatic docking of the tested axle. After the test is completed, the test results will pop up automatically. No manual operation is required throughout the test, and the test can be completed by pressing buttons on the touch screen.

[0039] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited thereto. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principles of the present invention are all equivalent replacement modes and are included in the protection scope of the present invention.

Claims

1. An NVH testing device, used in NVH testing of a powertrain, wherein the powertrain has a wheel hub at an end, and the outer side of the wheel hub has a plurality of docking holes or docking posts on a first circumference, characterized in that: NVH testing equipment includes: A workbench having a first tabletop and a second tabletop; A rotating device, used for driving the workbench so that the first table surface and the second table surface of the workbench are alternately positioned between the adjustment station and the detection station; The loading device is arranged on the first machine base, and the first machine base is provided with a first driving device; the loading device includes a driving shaft extending toward the detection station and driven by a first motor to rotate around its central axis, and the first motor provides power for the power assembly to be detected; the first driving device is connected to the loading device to drive the loading device to move back and forth along the extension direction of the driving shaft, so as to dock or release the connection when the driving shaft moves to the docking hole or docking column of the wheel hub of the power assembly to be detected at the detection station; The laser distance measuring device is arranged on the first frame, and the first frame is provided with a second motor; the driving shaft of the second motor is coaxially arranged with the wheel hub of the power assembly at the adjustment position, and when the rotating device transfers the workbench to make the power assembly at the adjustment position turn to the detection position, the driving shaft of the first motor is coaxial with the wheel hub of the power assembly at the detection position; the second motor can drive the laser distance measuring device to rotate around the driving shaft of the second motor as the central axis, and the center of the laser beam of the laser distance measuring device falls on the first circumference, which is used to measure the distance between the laser distance measuring device and the obstacle encountered when the laser beam is emitted; When the outer side surface of the wheel hub is on the first circumference and is a plurality of docking holes, when the distance measured by the laser distance measuring device is less than the set distance, the second motor drives the laser distance measuring device to rotate around the driving shaft of the second motor as the center axis until the distance measured by the laser distance measuring device is greater than the set distance, and the first motor and the second motor rotate synchronously in the same direction; when the outer side surface of the wheel hub is on the first circumference and is a plurality of docking columns, when the distance measured by the laser distance measuring device is greater than the set distance, the second motor drives the laser distance measuring device to rotate around the driving shaft of the second motor as the center axis until the distance measured by the laser distance measuring device is equal to the set distance, and the first motor and the second motor rotate synchronously in the same direction; A detector, used for performing NVH detection on the power assembly to be detected which is at the detection station and has been docked with the driving shaft of the loading device; The output shaft of the first motor is docked with the docking device through a coupling, and the front end surface of the docking device is concavely or convexly provided with a plurality of accommodating holes or accommodating columns corresponding to the docking holes or docking columns of the wheel hub. When the first motor provides power for the power assembly to be detected, the docking holes or docking columns of the wheel hub dock with the corresponding accommodating columns or accommodating holes; A bearing tray is also butt-connected between the coupling and the docking device, a bearing bracket is provided on the first machine base corresponding to the bearing tray, a bearing block which can slide up and down is provided on the bearing bracket, a V-shaped bearing groove is formed on the upper top surface of the bearing block, a cylinder body of a horizontal cylinder is provided on the bearing bracket, a tilting block is connected to the cylinder shaft of the lifting cylinder, the tilting block has an inclined surface, an abutment column is formed by extending downward from the bottom surface of the bearing block, and the abutment column abuts on the inclined surface. Under the action of the lifting cylinder, the tilting block moves forward and the abutment column slides on the inclined surface, so that the bearing block can move up and down along the bearing bracket. When the first motor provides power for the power assembly to be detected, the bearing tray abuts in the V-shaped bearing groove of the supporting block.

2. The NVH detection device according to claim 1, characterized in that: The workbench is rotatably mounted on the base, a large gear is fixedly arranged on the lower end surface of the workbench, the rotating device is a rotating motor, the rotating motor is connected to drive a small gear through a reduction box, and the small gear and the large gear are meshed and driven.

3. The NVH detection equipment according to claim 1, characterized in that: The first motor is installed on the motor base, and the motor base is provided with a guide block. The first motor base is provided with a guide rail extending toward the detection station, and the guide block is slidably set on the guide rail and can slide along the guide rail. The first driving device includes a driving motor, a screw rod and a nut seat. The nut seat is fixedly connected to the guide block, the screw rod and the nut seat are connected by threads, and the output shaft of the driving motor is connected to the screw rod.

4. The NVH detection device according to claim 1, characterized in that: The first table and the second table are each provided with a supporting device and a fixing device for installing and fixing the power assembly, the supporting device comprises a left supporting frame, a right supporting frame and a middle supporting frame, the left supporting frame and the right supporting frame are arranged at opposite ends of the table, the middle supporting frame is in the middle of the left supporting frame and the right supporting frame and deviates from the connection arrangement of the left supporting frame and the right supporting frame; the left supporting frame and the right supporting frame each comprise a sliding seat, a connecting block and a limiting block stacked and installed together from bottom to top, the upper end surface of the limiting block is formed with a V-shaped limiting groove, the sliding seat is installed on a guide rail and connected to the driving shaft of a linear driving mechanism, under the action of the linear driving mechanism, the sliding seat can move back and forth along the guide rail; the fixing device comprises a left fixing frame, a right fixing frame and a middle fixing frame arranged on the table corresponding to the left supporting frame, the right supporting frame and the middle supporting frame, when the power assembly is placed on the supporting device, the fixing arms of the left fixing frame, the right fixing frame and the middle fixing frame are respectively pressed against the power assembly.

5. The NVH detection device according to claim 4, characterized in that: The middle support frame includes a connecting block and a limit block which are stacked and installed together from bottom to top, the upper end surface of the limit block is formed with a V-shaped limiting groove, the connecting block is provided with a slide groove, an adjustment block is installed in the slide groove, the adjustment block is provided with a T-slot, the first table top and the second table top are each provided with a middle cylinder, the cylinder body of the middle cylinder is installed on the first table top or the second table top, the cylinder shaft of the middle cylinder is connected with a guide column, the guide column is in an I-shape and is connected to the T-slot and can slide along the length direction of the T-slot.

6. The NVH detection device according to any one of claims 1 to 5, characterized in that: The powertrain has two wheel hubs at the ends. The NVH detection equipment has two loading devices and laser ranging devices. With the rotation center axis of the workbench as the center axis, the two loading devices and the laser ranging device are distributed in a clockwise direction as a first laser ranging device, a second laser ranging device, a first loading device and a second loading device; the driving shaft of the second motor of the first laser ranging device is coaxial with the driving shaft of the second motor of the second laser ranging device, the driving shaft of the first loading device is coaxial with the driving shaft of the second loading device, and the center axes of the wheel hubs of the powertrain on the first table and the second table are coaxial with the driving shafts of the corresponding second motor and second loading devices.

7. The NVH testing device according to claim 6, characterized in that: The power assembly also includes a power output end located between the two wheel hubs, the loading device also includes a third motor installed on the machine, the loading device includes a drive shaft extending toward the detection station and driven by the third motor to rotate around its central axis, the drive shaft of the third motor is connected to the power output end to provide power for the power assembly to be detected; a second drive device is connected to the machine to drive the machine to move back and forth along the extension direction of the drive shaft, and is used to connect or release the drive shaft when it moves to the power output end of the power assembly to be detected at the detection station.

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