A device for detecting NVH of automobile steering gear and a working method thereof

Abstract

The present invention provides a device for detecting the NVH of an automobile steering gear and a working method thereof. The device includes a base, a support frame and a detection mechanism. The support frame is fixed above the base. A numerical control display screen is arranged on the right side of the support frame. A pendant is arranged on the left side of the support frame. The detection mechanism is located inside the support frame. A bottom plate is arranged inside the support frame. The detection mechanism includes a loading mechanism, a detection component, a driving mechanism and a bearing mechanism. The driving mechanism provides power for the bearing mechanism. A first slide rail is arranged between the bearing mechanism and the bottom plate, and a second slide rail is arranged between the loading mechanism and the bottom plate. The working method includes steps S1 to S5. When using the detection device, the detection personnel can view the various NVH indicators of the steering gear to be inspected through the numerical control display screen. At the same time, they can also manually judge whether the product has abnormal noise, thereby ensuring the production quality of the steering gear and improving production efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of detection equipment, and in particular to a device for detecting NVH of an automobile steering gear and a working method thereof. Background Art

[0002] Noise, Vibration and Harshness (NVH) is an important indicator for measuring the quality of automobile manufacturing. The NVH problem of vehicles is one of the issues that major vehicle manufacturers and parts manufacturers in the international automobile industry are concerned about. The steering gear is one of the important parts in automobile production, and the NVH index of the steering gear is particularly important for automobile production. At present, the NVH detection of the steering gear mainly relies on manual noise detection of the steering gear to determine whether the product has abnormal noise, which is likely to lead to inaccurate test results. Summary of the invention

[0003] The first object of the present invention is to provide a device capable of accurately detecting the NVH of an automobile steering gear.

[0004] The second object of the present invention is to provide a working method of the above-mentioned device.

[0005] In order to achieve the above-mentioned first purpose, the device provided by the present invention includes a base, a support frame and a detection mechanism, the support frame is fixed above the base, the detection mechanism is located inside the support frame, a bottom plate is arranged inside the support frame, the detection mechanism includes a loading mechanism, a detection component, a driving mechanism and a bearing mechanism, the detection component is arranged on the upper surface of the bottom plate, the driving mechanism is arranged inside the base, the driving mechanism provides power for the bearing mechanism, a first slide rail is arranged between the bearing mechanism and the bottom plate, the bearing mechanism can slide along the first slide rail, and a second slide rail is arranged between the loading mechanism and the bottom plate, the loading mechanism can slide along the second slide rail.

[0006] It can be seen from the above scheme that when the equipment is used to inspect the steering gear, the inspection mechanism can inspect the NVH index of the steering gear, and the inspector can view the various NVH indexes of the steering gear to be inspected through the CNC display screen, and can also manually determine whether the product has abnormal noise. In this way, the inspector can obtain more accurate test results, detect defective products more accurately, and rework the defective products in time, which ensures the production quality of the steering gear and improves production efficiency.

[0007] Preferably, the loading mechanism comprises a magnetic powder brake, a first coupling, a torque sensor, a second coupling, a connecting shaft, a spline head and a locking sleeve which are connected in sequence, and the locking sleeve is sleeved on the spline head.

[0008] A further solution is that the loading mechanism also includes a support seat, a first protective cover, a fixed plate and a first clamping cylinder, the first protective cover is arranged above the support seat, the first coupling, the torque sensor and the second coupling are arranged inside the support seat, the support seat is arranged on the upper surface of the fixed plate, and the first clamping cylinder is used to position the loading mechanism.

[0009] In the above scheme, the bearing of the steering gear is inserted into the spline head, and then the spline head is locked by the locking sleeve. The magnetic powder brake is used to apply torque to the steering gear, and the torque sensor is used to detect the magnitude of the torque. When the loading mechanism applies a load to the steering gear, the first clamping cylinder extends downward to position the loading mechanism so that the loading mechanism will not shift easily. The reason why it is necessary to apply a load to the steering gear is that the steering gear will be subject to resistance from other parts of the car during actual application. Applying a load to the steering gear is to better simulate the use environment of the steering gear. The results detected under this use environment are also more representative.

[0010] A further solution is that the detection assembly includes a support frame, the support frame includes a first main body and a second main body which are perpendicular to each other, the first main body is arranged on the upper surface of the base plate, the second main body is provided with a second clamping cylinder and a first propulsion cylinder, a clamping head is provided at the output end of the second clamping cylinder, and a detection head is provided at the output end of the first propulsion cylinder.

[0011] A further solution is that the detection head includes a first connecting plate, a third slide rail is arranged on the lower surface of the first connecting plate, a slider is arranged on the third slide rail, a second connecting plate is fixed on the slider, and an electronic stethoscope and an industrial accelerometer are arranged on the second connecting plate.

[0012] In the above scheme, when the NVH test of the steering gear begins, the second clamping cylinder is first pushed downward, and the clamping head abuts against the bearing mechanism, so that the bearing mechanism will not be offset during the test. Then the first clamping cylinder is pushed downward, so that the detection head moves downward. When the detection head moves to the specified position, the slider slides forward, driving the electronic stethoscope and the industrial accelerometer to the specified position. After reaching the specified position, the NVH test of the steering gear begins. The electronic stethoscope is used to detect whether there is any abnormal sound inside the steering gear, and the industrial accelerometer is used to detect the vibration and acoustic roughness of the steering gear.

[0013] A further solution is that the drive mechanism includes a servo motor, a reducer, a third coupling, a bearing and an output shaft connected in sequence, and the drive mechanism also includes a second protective cover, and the third coupling is arranged inside the second protective cover.

[0014] In the above scheme, the servo motor outputs power to the output shaft through various transmission mechanisms.

[0015] A further solution is that the bearing mechanism includes a mounting plate, a mounting seat, a limit seat, a support block and a fixing frame, the mounting plate is fixed on the base plate, the mounting seat is fixed on the upper surface of the mounting plate, the limit seat and the support block are arranged on the upper surface of the mounting seat, the fixing frame is arranged on the limit seat and the support block, and a limit pin is arranged on the limit seat.

[0016] A further solution is that a mounting hole is formed on the fixing frame, a driving member is arranged inside the mounting hole, a transmission shaft is arranged at the bottom of the fixing frame, and the transmission shaft is connected to the output shaft.

[0017] In the above scheme, the steering gear is placed in the mounting hole. When the steering gear needs to start rotating, the servo motor is started, the servo motor drives the output shaft to rotate, and the output shaft drives the driving member to rotate through the transmission shaft, and the driving member drives the steering gear to rotate. Through the above process, the steering gear is driven by the driving mechanism to rotate.

[0018] A further solution is that the equipment also includes running wheels and an operating box, the running wheels are arranged at the bottom of the base, and the operating box is arranged at the upper part of the supporting frame.

[0019] In the above scheme, the running wheels can drive the whole device to move forward, and the inspector can control the actions of each working mechanism of the device through the operation box, which is more convenient to use.

[0020] In order to achieve the above-mentioned second purpose, the working method provided by the present invention comprises the following steps:

[0021] Step S1: placing the steering gear on the supporting mechanism, and then locking the steering gear;

[0022] Step S2: Push the carrying mechanism forward, insert the steering gear into the detection assembly, and then lock the detection assembly;

[0023] Step S3: starting the driving mechanism, which drives the steering gear to rotate;

[0024] Step S4: starting the loading mechanism to apply a load to the steering gear;

[0025] Step S5: Start the detection component, and the detection component detects the steering gear.

[0026] It can be seen from the above scheme that in the process of executing step S1, after the steering gear is placed in the mounting hole, it is manually locked. In the process of executing step S2, after the steering gear is inserted into the spline head, the locking sleeve is manually locked. In the process of executing step S4, the load value applied to the steering gear can be adjusted according to actual needs. In the process of executing step S5, the inspection personnel can view the NVH indicators of the workpiece to be inspected through the CNC display screen. If qualified, the steering gear can be put into production. If unqualified, the steering gear needs to be reworked. Through the above-mentioned detection method, the inspection personnel can distinguish qualified products and defective products from the workpiece to be inspected more quickly and accurately, which can improve production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural diagram of an embodiment of the detection equipment of the present invention.

[0028] Figure 2 It is a structural diagram of an embodiment of the detection device of the present invention with some components hidden.

[0029] Figure 3 It is a left view of the loading mechanism of the detection device embodiment of the present invention.

[0030] Figure 4 is along Figure 3 Cross-sectional view along the AA direction.

[0031] Figure 5 It is a structural diagram of the detection component of the detection device embodiment of the present invention.

[0032] Figure 6 It is an exploded view of the driving mechanism of the detection device embodiment of the present invention.

[0033] Figure 7 It is a structural diagram of the first viewing angle of the supporting mechanism of the detection equipment embodiment of the present invention.

[0034] Figure 8 It is a structural diagram of the supporting mechanism of the detection device embodiment of the present invention from a second viewing angle.

[0035] Fig. 9 It is a flow chart of the working method of the present invention.

[0036] The present invention is further described below in conjunction with the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0037] See also Figure 1 and Figure 2 , Figure 2 for Figure 1The structural diagram of the base 1 and the support frame 2 is hidden. The detection device provided in this embodiment includes a base 1, a support frame 2 and a detection mechanism. The support frame 2 is fixed above the base 1. A numerical control display screen 3 is arranged on the right side of the support frame 2. A hanger 4 is arranged on the left side of the support frame 2. The equipment operation instruction book is installed inside the hanger 4. The detection mechanism is located inside the support frame 2. A bottom plate 5 is arranged inside the support frame 2. The detection mechanism includes a loading mechanism 6, a detection component 7, a driving mechanism 8 and a bearing mechanism 9. The detection component 7 is arranged on the upper surface of the bottom plate 5, the driving mechanism 8 is arranged inside the base 1, and the driving mechanism 8 provides power for the bearing mechanism 9. A first slide rail 10 is arranged between the bearing mechanism 9 and the bottom plate 5, and the bearing mechanism 9 can slide along the first slide rail 10. A second slide rail 11 is arranged between the loading mechanism 6 and the bottom plate 5, and the loading mechanism 6 can slide along the second slide rail 11. A walking wheel 12 is arranged at the bottom of the equipment, and the walking wheel 12 is arranged at the bottom of the base 1. The operation box 13 is arranged on the upper part of the support frame 2. The walking wheel 12 can drive the entire device to move forward. The inspector can control the actions of each working mechanism of the device through the operation box 13, making the entire device more convenient to use.

[0038] See also Figure 3 and Figure 4 The loading mechanism 6 includes a magnetic powder brake 61, a first coupling 62, a torque sensor 63, a second coupling 64, a connecting shaft 65, a spline head 66 and a locking sleeve 67 which are connected in sequence. The locking sleeve 67 is sleeved on the spline head 66. The loading mechanism also includes a support seat 68, a first protective cover 69, a fixing plate 610 and a first pressing cylinder 611. The first protective cover 69 is arranged above the support seat 68, the first coupling 62, the torque sensor 63 and the second coupling 64 are arranged inside the support seat 68, the support seat 68 is arranged on the upper surface of the fixing plate 610, and the first pressing cylinder 611 is used to position the loading mechanism 6.

[0039] In this embodiment, the loading mechanism 6 moves to a specified position along the second slide rail 11, and the bearing mechanism 9 moves to a specified position along the first slide rail 10. The bearing of the steering gear is inserted into the spline head 66, and then the spline head 66 is locked by the locking sleeve 67. The magnetic powder brake 61 is used to apply torque to the steering gear, and the torque sensor 63 is used to detect the magnitude of the torque. When the loading mechanism 6 applies a load to the steering gear, the first clamping cylinder 611 extends downward to position the loading mechanism 6 so that the loading mechanism 6 will not be easily displaced. The reason why the steering gear needs to be loaded is that the steering gear will be subject to resistance from other parts of the car during actual application. The purpose of applying a load to the steering gear is to better simulate the use environment of the steering gear, and the results detected in this use environment are more representative. In this process, the inspector can adjust the torque applied to the steering gear according to actual needs. After the press-fitting is completed, the bearing mechanism 9 is reset along the first slide rail 10, and the loading mechanism 6 is reset along the second slide rail 11.

[0040] See also Figure 5 The detection assembly 7 includes a support frame 71, which includes a first main body 72 and a second main body 73 which are perpendicular to each other. The first main body 72 is arranged on the upper surface of the bottom plate 5, and a second pressing cylinder 74 and a first propulsion cylinder 75 are arranged on the second main body 73. A pressing head 76 is arranged at the output end of the second pressing cylinder 74, and a detection head 77 is arranged at the output end of the first propulsion cylinder 75. The detection head 77 includes a first connecting plate 78, a third slide rail 79 is arranged on the lower surface of the first connecting plate 78, a slider 710 is arranged on the third slide rail, a second connecting plate 711 is fixed on the slider 710, and an electronic stethoscope 712 and an industrial accelerometer 713 are arranged on the second connecting plate 711.

[0041] In this embodiment, when the NVH test of the steering gear begins, the second clamping cylinder 74 is first pushed downward, and the clamping head 76 abuts against the supporting mechanism 9, so that the supporting mechanism 9 will not be offset during the test. Then the first clamping cylinder 75 is pushed downward, so that the detection head 77 moves downward. When the detection head 77 moves to the specified position, the slider 710 slides forward, driving the electronic stethoscope 712 and the industrial accelerometer 713 to the specified position. After reaching the specified position, the NVH test of the steering gear begins. The electronic stethoscope 712 is used to detect whether there is any abnormal sound inside the steering gear, and the industrial accelerometer 713 is used to detect the vibration and acoustic roughness of the steering gear.

[0042] See also Figure 6The driving mechanism 8 includes a servo motor 81, a reducer 82, a third coupling 83, a bearing 84 and an output shaft 85 which are connected in sequence. The driving mechanism 8 also includes a second protective cover 86 and a sleeve 87. The third coupling 83 is arranged inside the second protective cover 86, and the sleeve 87 is wrapped around the outside of the bearing 84.

[0043] See also Figure 7 and Figure 8 The bearing mechanism 9 includes a mounting plate 91, a mounting seat 92, a limiting seat 93, a support block 94 and a fixing frame 95. The mounting plate 91 is fixed on the bottom plate 5, the mounting seat 92 is fixed on the upper surface of the mounting plate 91, the limiting seat 93 and the support block 94 are arranged on the upper surface of the mounting seat 92, the fixing frame 95 is arranged on the limiting seat 93 and the support block 94, and a limiting pin 96 is arranged on the limiting seat 93. A mounting hole 97 is formed on the fixing frame 95, a driving member 98 is arranged on the inner side of the mounting hole 97, a transmission shaft 99 is arranged at the bottom of the fixing frame 95, and the transmission shaft 99 is connected to the output shaft 85. A protrusion 910 is arranged on the fixing frame 95. When the detection component 7 performs NVH detection on the steering gear, the second clamping cylinder 74 is pushed downward, and the clamping head 76 moves down to abut against the protrusion 910 to achieve a positioning effect. A pressing block 911 is provided on the supporting mechanism 9 , and the pressing block 911 fixes the supporting mechanism 9 on the base plate 5 .

[0044] In this embodiment, the steering gear is placed in the mounting hole 97. When the steering gear needs to start rotating, the servo motor 81 is started, the servo motor 81 drives the output shaft 85 to rotate, and the output shaft 85 drives the driving member 98 to rotate through the transmission shaft 99, and the driving member 98 drives the steering gear to rotate. Through the above process, the steering gear is driven by the driving mechanism 8 to rotate. During the detection process, the bearing of the steering gear rotates by itself, which is to simulate the use scenario of the steering gear constantly rotating during actual use.

[0045] See also Fig. 9 The working method provided by the present invention includes the following steps: First, execute step S1, place the steering gear on the supporting mechanism, and then lock the steering gear. Next, execute step S2, push the supporting mechanism forward, insert the steering gear into the detection component, and then lock the detection component. Next, execute step S3, start the driving mechanism, and the driving mechanism drives the steering gear to rotate. Next, execute step S4, start the loading mechanism, and apply a load to the steering gear. Finally, execute step S5, start the detection component, and the detection component detects the steering gear. After executing the above steps, take out the steering gear.

[0046] In this embodiment, during the execution of step S1, the steering gear is placed in the mounting hole 97 and then manually locked. During the execution of step S2, the steering gear is inserted into the spline head 66 and then the locking sleeve 67 is manually locked. It should be noted that the specific execution process of each of the above working steps has been described in detail above, so it will not be repeated here. During the execution of step S5, the driving mechanism 8 drives the steering gear to rotate in order to simulate the use scenario of the steering gear during actual use. The data detected in this scenario is more accurate and more convincing.

[0047] Although the present invention has been shown and described in conjunction with the present embodiment and the preferred embodiment, it should be understood by those skilled in the art that various changes may be made to the present invention in form and detail without departing from the spirit and scope of the present invention as defined by the appended claims, and all of these changes are within the scope of protection of the present invention.

Claims

1. A device for detecting NVH of an automobile steering gear, comprising a base, a support frame and a detection mechanism, wherein the support frame is fixed above the base, the detection mechanism is located inside the support frame, and a numerical control display screen is provided on the right side of the support frame, characterized in that: A bottom plate is arranged inside the support frame, the detection mechanism comprises a loading mechanism, a detection assembly, a driving mechanism and a bearing mechanism, the detection assembly is arranged on the upper surface of the bottom plate, the driving mechanism is arranged inside the base, the driving mechanism provides power for the bearing mechanism, a first slide rail is arranged between the bearing mechanism and the bottom plate, the bearing mechanism can slide along the first slide rail, a second slide rail is arranged between the loading mechanism and the bottom plate, the loading mechanism can slide along the second slide rail, and the bearing mechanism can clamp the diverter into the detection assembly when it is pushed forward, and then lock the detection assembly; The loading mechanism comprises a magnetic powder brake, a first coupling, a torque sensor, a second coupling, a connecting shaft, a spline head and a locking sleeve which are connected in sequence, and the locking sleeve is sleeved on the spline head; The loading mechanism further comprises a support seat, a first protective cover, a fixing plate and a first pressing cylinder, wherein the first protective cover is arranged above the support seat, the first coupling, the torque sensor and the second coupling are arranged inside the support seat, the support seat is arranged on the upper surface of the fixing plate, and the first pressing cylinder is used to position the loading mechanism; The detection assembly includes a support frame, the support frame includes a first main body and a second main body perpendicular to each other, the first main body is arranged on the upper surface of the bottom plate, a second pressing cylinder and a first propulsion cylinder are arranged on the second main body, a pressing head is arranged at the output end of the second pressing cylinder, and a detection head is arranged at the output end of the first propulsion cylinder; The detection head comprises a first connecting plate, a third slide rail is arranged on the lower surface of the first connecting plate, a slider is arranged on the third slide rail, a second connecting plate is fixed on the slider, and an electronic stethoscope and an industrial accelerometer are arranged on the second connecting plate.

2. The device according to claim 1, characterized in that: The driving mechanism includes a servo motor, a reducer, a third coupling, a bearing and an output shaft which are connected in sequence. The driving mechanism also includes a second protective cover, and the third coupling is arranged inside the second protective cover.

3. The device according to claim 2, characterized in that: The bearing mechanism includes a mounting plate, a mounting seat, a limiting seat, a support block and a fixing frame, wherein the mounting plate is fixed to the base plate, the mounting seat is fixed to the upper surface of the mounting plate, the limiting seat and the support block are arranged on the upper surface of the mounting seat, the fixing frame is arranged on the limiting seat and the support block, and a limiting pin is arranged on the limiting seat.

4. The device according to claim 3, characterized in that: A mounting hole is formed on the fixing frame, a driving member is arranged inside the mounting hole, a transmission shaft is arranged at the bottom of the fixing frame, and the transmission shaft is connected to the output shaft.

5. The device according to any one of claims 1 to 4, characterized in that: The equipment also includes running wheels and an operation box, wherein the running wheels are arranged at the bottom of the base, and the operation box is arranged at the upper part of the supporting frame.

6. A working method of a device for detecting NVH of an automobile steering gear, using the device as claimed in claim 1, characterized in that: The working method comprises the following steps: Step S1: placing the steering gear on the supporting mechanism and locking the steering gear; Step S2: pushing the carrying mechanism forward, inserting the diverter into the detection assembly, and then locking the detection assembly; Step S3: starting the driving mechanism, and the driving mechanism drives the steering gear to rotate; Step S4: starting the loading mechanism to apply a load to the steering gear; Step S5: Start the detection component, and the detection component detects the steering device.

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