An automotive steering system test device

Abstract

The present invention relates to the technical field of automotive steering testing. More specifically, the present invention relates to a testing device for an automotive steering system, which includes a workbench. On one side of the workbench, there is a conveying member capable of conveying the product to be tested, and the conveying member is located at the middle notch position of the workbench; a supporting member capable of jacking up the product to be tested is installed on the conveying member; two clamping members capable of clamping the product to be tested and providing a load force are installed on the workbench, and the two clamping members are symmetrically arranged. This device can simulate the actual performance of the steering system of an automobile under real load conditions; this device can simulate the real-time torque performance of an automobile under different load conditions; this device can simulate the comprehensive performance such as real-time noise and vibration of an automobile under different load conditions; this device can simulate the functions of real-time transmission of some detection data and data analysis and adjustment corresponding to different working conditions.

Description

Technical Field

[0001] The present invention relates to the technical field of automotive steering testing, and more specifically, the present invention relates to a testing device for an automotive steering system. Background Art

[0002] The control of the driving direction of an automobile is inseparable from a crucial component - the steering system. It is like the navigator of the vehicle, ensuring that the driver's intentions can be translated into precise driving routes. The steering system mainly consists of two major parts: a steering gear with a steering wheel and a steering transmission device, which work together to achieve flexible steering of the vehicle.

[0003] With the continuous improvement of industrial levels and the continuous development of driverless technologies, whether there are uncontrollable factors in the autonomous driving of automobiles on the road. These factors were discovered and adjusted in a timely manner during the industrial manufacturing period. Therefore, some necessary tests for the automotive steering system during autonomous driving steering are still essential. Before leaving the factory, the automotive steering system needs to simulate its steering load and steering torque, and whether the noise and vibration frequencies generated by the steering system under this torque are abnormal. If the steering load is too large, it will cause inaccurate steering and incomplete steering, resulting in incorrect direction steering when the vehicle is driving automatically. If the load and steering torque are too large, it will cause additional noise, bringing an unpleasant driving experience to the driver.

[0004] Therefore, we propose a testing device for an automotive steering system to solve the above problems. Summary of the Invention

[0005] In order to overcome the above-mentioned defects of the prior art, an embodiment of the present invention provides a testing device for an automotive steering system to solve the problems raised in the above background art.

[0006] To achieve the above object, the present invention provides the following technical solution: A testing device for an automotive steering system, including a workbench. On one side of the workbench, there is a conveying member capable of conveying the product to be tested, and the conveying member is located at the middle notch position of the workbench; on the conveying member, there is a supporting member capable of jacking up the product to be tested; on the workbench, there are two clamping members capable of clamping the product to be tested and providing a load force, and the two clamping members are symmetrically arranged; on the workbench, there is an adjusting member, and on the adjusting member, there is a torque member, and the torque member can adjust the angle and position through the adjusting member; on the workbench, there is a detecting member, and the detecting member is located above the conveying member.

[0007] In a preferred embodiment, the conveying member includes a conveying bracket arranged at the middle position of the workbench. On the conveying bracket, there is a pushing conveying line, on which there is a placing member capable of placing the steering system. The steering system is an R-EPS steering system, and on the pushing conveying line, there is the same pushing member.

[0008] In a preferred embodiment, the placing member includes a moving plate placed on two pushing conveying lines. A placing plate is fixedly connected to the moving plate. Two first guide rails are fixedly connected to the placing plate. Two first guide blocks that match the first guide rails are slidably connected to the two first guide rails. The same placing seat is fixedly connected to the two first guide blocks. A support frame is fixedly connected to the placing seat. The support frame is a rectangular plate, and a V-shaped opening is provided on the side wall of the rectangular plate. A vertical block is fixedly connected to the placing plate. Two positioning pins are fixedly connected to the vertical block. Two symmetrically arranged handles are fixedly connected to the placing plate.

[0009] In a preferred embodiment, the pushing member includes two fixed blocks fixedly connected to the conveying support. The same fixing plate is fixedly connected to the two fixed blocks. A second cylinder is installed on the fixing plate. Two linear bearings penetrate through the fixing plate. Linear optical axes connected to the moving plate penetrate through the two linear bearings.

[0010] In a preferred embodiment, the supporting member includes a support frame fixedly connected to the workbench. Two second guide rails are fixedly connected to the support frame. Two second guide blocks that match the second guide rails are slidably connected to the two second guide rails. A first cylinder is installed on the workbench. A support block is installed at the output end of the first cylinder.

[0011] In a preferred embodiment, the clamping member includes a support plate fixedly connected to multiple second guide blocks. Two symmetrically arranged mounting brackets are fixedly connected to the support plate. A screw rod driving mechanism is installed on one of the mounting brackets. A push rod is installed at the output end of the screw rod driving mechanism. One end of the push rod passes through the side wall of the other mounting bracket and extends to the outside. A pressing head that matches the steering system is installed at one end of the push rod. And a part of the support block is connected to the pressing head. Multiple limiting seats are fixedly connected to the support plate. Two guide rods are provided between the multiple limiting seats. A clamping member is provided at the connection between the push rod and the screw rod driving mechanism. One ends of the two guide rods respectively pass through the clamping member and extend to one side. A clamping switch is installed on the side wall of the support frame. And a contact plate is fixedly connected to the support plate on the side of the clamping switch.

[0012] In a preferred embodiment, the adjusting member includes a placement rack fixedly connected to the workbench. A plurality of third guide rails are fixedly connected to the placement rack. A plurality of first sliders are slidably connected to the plurality of third guide rails. The same connecting plate is fixedly connected to the plurality of first sliders. A plurality of fourth guide rails are fixedly connected to the connecting plate. A plurality of second sliders are slidably connected to the fourth guide rails. The same mounting plate is fixedly connected to the plurality of second sliders. A locking screw member connected to the mounting plate is installed on the connecting plate. A fixing frame is fixedly connected to the mounting plate. Two fifth guide rails are installed on the fixing frame through a plurality of first rotating blocks. The first rotating block is rotatably connected to the fixing frame. Two inclined plates are respectively installed on the two fifth guide rails through second rotating blocks. The inclined plate is rotatably connected to the second rotating block. The second rotating block is slidably connected to the fifth guide rail. An adjusting cylinder hinged to the inclined plate is obliquely installed on the fixing frame.

[0013] In a preferred embodiment, the torque member includes two sixth guide rails installed on the side wall of the inclined plate. The same connecting fixing plate is installed on the two sixth guide rails. A third slider is slidably connected to each of the two sixth guide rails. The two third sliders are respectively connected to the connecting fixing plate. A connecting fixing frame is fixedly connected to the side wall of the connecting fixing plate. A servo motor is installed on the connecting fixing frame. A coupling is installed at the output end of the servo motor. One end of the coupling is installed with a torque protector. A cartridge is installed at the lower end of the torque protector. A third cylinder is installed on the side wall of the connecting fixing plate. A fixing vertical plate is installed at the output end of the third cylinder. A cylinder clamp is fixedly connected to the side wall of the fixing vertical plate. A jaw is installed at the output end of the cylinder clamp.

[0014] In a preferred embodiment, the detecting member includes two vertical columns fixedly connected. The same cross plate is fixedly connected to the upper ends of the two vertical columns. A notch is provided on the side wall of the cross plate. The cartridge is located below the notch. An installation vertical frame is fixedly connected to the lower end of the cross plate. An installation bracket is installed on the installation vertical frame. A connector in contact with the steering system is installed on the installation bracket.

[0015] In a preferred embodiment, the automotive steering system testing device includes the following testing methods:

[0016] Steering system noise performance test:

[0017] Step S1: Start the screw drive mechanism to provide a load to the steering system, and then start the servo motor and the fourth cylinder to provide a rotational force to the steering system;

[0018] Condition 1: The screw drive mechanism provides 50% load, that is, 8.25 KN, and the servo motor 64 has a uniform input shaft speed of 60 RPM;

[0019] Operating condition 2: The lead screw drive mechanism provides 90% of the load, i.e., 14.85 KN, and the servo motor 64 has a constant input shaft speed of 60 RPM;

[0020] Operating condition 3: The lead screw drive mechanism provides 40% of the load, i.e., 6.6 KN, and the servo motor 64 accelerates uniformly from 0 - 90 RPM;

[0021] Step S2: Use multiple patch type vibration sensors to collect noise signals at the radial direction of the motor, at the synchronous belt, and at a position 100 mm from the meshing end face;

[0022] Step S3: Analyze the noise frequency spectrum in the range of 20 - 20 kHz to determine whether there is abnormal noise, whistling or resonance. Multiple patch type vibration sensors collect data synchronously, with a sampling frequency ≥ 20 kHz. The data is subjected to high - pass filtering (cut - off frequency 100 Hz) to eliminate the interference of the servo motor;

[0023] No - load torque test:

[0024] Step S1: Rotate the input shaft of the servo motor clockwise from the straight - line position to the maximum right - turn angle at a speed of 5 rpm ± 5%, then rotate counter - clockwise to the maximum left - turn angle, then rotate the input shaft at 5 rpm in the positive direction to 90% of the maximum right - turn angle (CW) of the steering gear, and finally rotate the input shaft at 5 rpm counter - clockwise back to the starting position, while recording the torque - angle curve;

[0025] Step S2: Record and plot the rotational torque - angle curve, and record the maximum value and fluctuation of the input shaft;

[0026] After the data is processed by band - pass filtering, determine whether it meets the symmetry and hysteresis indexes (symmetry ≥ 95%, H40 ≤ 1.6 Nm and H80 ≤ 2.01.6 Nm);

[0027] Power - assist performance test method:

[0028] It includes static performance test and dynamic performance test:

[0029] The static performance test is as follows:

[0030] Step S1: Rotate the input shaft of the servo motor clockwise (CW) at a speed of 5° / s (i.e., a rotational speed of 0.833 rpm) to - 10 NM, 0 NM, and 10 NM respectively;

[0031] Step S2: Record and plot the rotational torque - angle curve;

[0032] After the data is processed by band - pass filtering, determine whether it meets the symmetry and hysteresis indexes (symmetry ≥ 95%, H40 ≤ 1.6 Nm and H80 ≤ 2.01.6 Nm);

[0033] Dynamic performance test:

[0034] Step S1: Working condition 1: The lead screw drive mechanism provides a 20% load, i.e., 3.3 KN, and the rotational speed of the input shaft of servo motor 64 is 600° / s;

[0035] Working condition 2: The lead screw drive mechanism provides a 100% load, i.e., 16.5 KN, and the rotational speed of the input shaft of servo motor 64 is 360° / s;

[0036] Step S2: Record and plot the rotational torque - angle curve;

[0037] Step S3: After the data is processed by band - pass filtering;

[0038] Judgment result: Working condition 1: The torque of the input shaft ≤ 7 NM, torque fluctuation range: TBD;

[0039] Working condition 2: The torque of the input shaft ≤ 5 NM, torque fluctuation range: TBD.

[0040] Technical effects and advantages of the present invention:

[0041] This device can simulate the actual performance of the steering system of an automobile under real - load working conditions; this device can simulate the real - time torque performance of an automobile under different load working conditions; this device can simulate the comprehensive performance such as real - time noise and vibration of an automobile under different load working conditions; this device can simulate the real - time transmission of some detection data and data analysis and adjustment functions corresponding to different working conditions. Brief description of the drawings

[0042] Figure 1 It is a schematic connection structure diagram of the present invention;

[0043] Figure 2 It is a schematic connection structure diagram of the first perspective of the present invention;

[0044] Figure 3 It is a schematic connection structure diagram of the conveying part in the present invention;

[0045] Figure 4 It is Figure 3 a side - view connection structure diagram of;

[0046] Figure 5 It is a partial connection structure diagram of the placing part and the pushing part in the present invention;

[0047] Figure 6 It is Figure 3 a bottom - view connection structure diagram of;

[0048] Figure 7 It is a schematic connection structure diagram of the second perspective of the present invention;

[0049] Figure 8Schematic diagram of the local connection structure of the support member and the fixture member in the present invention;

[0050] Figure 9 is Figure 8 schematic diagram of the side view connection structure;

[0051] Figure 10 Schematic diagram of the local connection structure of the clamping member in the present invention;

[0052] Figure 11 Schematic diagram of the partial sectional connection structure of the clamping member in the present invention;

[0053] Figure 12 Schematic diagram of the connection structure from the third perspective in the present invention;

[0054] Figure 13 Schematic diagram of the connection structure between the adjusting member and the torque member in the present invention;

[0055] Figure 14 Schematic diagram of the side view connection structure between the adjusting member and the torque member in the present invention;

[0056] Figure 15 Schematic diagram of the connection structure of the torque member in the present invention;

[0057] Figure 16 Schematic diagram of the local connection structure of the detection member in the present invention.

[0058] Reference numerals are: 1 workbench;

[0059] 2 conveying member, 21 conveying bracket, 22 pushing conveying line, 23 placing member, 24 steering system, 25 pushing member;

[0060] 231 moving plate, 232 placing plate, 233 first guide rail, 234 first guide block, 235 placing seat, 236 support frame, 237 vertical block, 238 positioning pin, 239 handle;

[0061] 251 fixed block, 252 fixing plate, 253 second cylinder, 254 linear bearing, 255 linear optical axis;

[0062] 3 support member, 31 support frame, 32 second guide rail, 33 second guide block, 34 first cylinder, 35 support block;

[0063] 4 fixture member, 41 support plate, 42 mounting bracket, 43 screw drive mechanism, 44 push rod, 45 pressure head, 46 limit seat, 47 guide rod, 48 clamping member, 49 clamping switch, 450 contact plate;

[0064] 481 clamping block, 482 mounting hole, 483 thin cylinder, 484 mounting disc, 485 input hole, 486 output hole;

[0065] 5 Adjusting member, 51 Placing rack, 52 Third guide rail, 53 Connecting plate, 54 Fourth guide rail, 55 Locking screw member, 56 Mounting plate, 57 Fixing bracket, 58 First rotating block, 59 Fifth guide rail, 510 Second rotating block, 511 Adjusting cylinder, 512 Inclined plate;

[0066] 6 Torque member, 61 Sixth guide rail, 62 Connecting fixing plate, 63 Connecting fixing bracket, 64 Servo motor, 65 Coupling, 66 Torque protector, 67 Cartridge, 68 Third cylinder, 69 Fixed vertical plate, 610 Cylinder fixture, 611 Claw, 612 Fourth cylinder;

[0067] 7 Detection member, 71 Vertical column, 72 Cross plate, 73 Mounting vertical frame, 74 Mounting bracket, 75 Connector. Detailed implementation manners

[0068] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0069] Refer to Figure 1 and Figure 2 , an automotive steering system test device, including a workbench 1. It should be noted in particular that the workbench 1 is concave-shaped, and the conveying member 2 is located in the middle of the workbench 1. Two fixture members 4 are respectively installed on the workbench 1, and the two fixture members 4 are respectively located on the left and right sides of the conveying member 2. The adjusting member 5 is located above one of the fixture members 4, and the torque member 6 is installed on the adjusting member 5 and is inclined. The detection member 7 is installed on the workbench 1, and a part of the detection member 7 is located above the conveying member 2. One end of the detection member 7 is lapped on the adjusting member 5 to ensure the stability of the detection member 7.

[0070] Refer to Figure 3 and Figure 4, a conveying member 2 is provided in the workbench 1. The conveying member 2 is located at the middle position of the workbench 1. The conveying member 2 includes a conveying support 21 arranged at the middle position of the workbench 1. A pushing conveyor line 22 is installed on the conveying support 21. A placing member 23 capable of placing the steering system 24 is placed on the pushing conveyor line 22. It should be particularly noted that the steering system 24 is an R-EPS steering system. A same pushing member 25 is installed on the pushing conveyor line 22. It should be particularly noted that the placing member 23 can move on the pushing conveyor line 22 through other driving devices. It should be particularly noted that two pulleys are provided in the pushing conveyor line 22. The two pulleys are connected by a belt in a transmission manner, and a motor connected thereto is provided on one side of one of the pulleys. When the motor works, the two pulleys can be rotated, and further the belt can be moved. It should be particularly noted that the belt is in contact with the placing plate 232 in the placing member 23, and there is a certain frictional force between the two, so that the placing member 23 can move normally on the pushing conveyor line 22. Two pneumatic stoppers are installed on the conveying support 21. The two pneumatic stoppers are respectively located on both sides of the moving plate 231. A stopper is installed at the output end of the pneumatic stopper. When the pneumatic stopper 23 works, the stopper can extend out, so that the stopper is located on one side of the placing plate 232, thereby enabling the moving plate 231 to be limited, and further avoiding the deviation of the moving plate 231.

[0071] Refer to Figure 4 and Figure 5 ; The placing member 23 includes a moving plate 231 placed on two pushing conveyor lines 22. A placing plate 232 is fixedly connected to the moving plate 231. Two first guide rails 233 are fixedly connected to the placing plate 232. Two first guide blocks 234 matching therewith are slidably connected to the two first guide rails 233. The same placing seat 235 is fixedly connected to the two first guide blocks 234. A support frame 236 is fixedly connected to the placing seat 235. It should be particularly noted that the support frame 236 is a rectangular plate, and a V-shaped opening is provided on the side wall of the rectangular plate, which can further place the product. A vertical block 237 is fixedly connected to the placing plate 232. Two positioning pins 238 are fixedly connected to the vertical block 237. The positioning pins are used for positioning the product. It should be particularly noted that the positioning pins 238 and the support frame 236 have the same function, and can both position the steering system 24 when it is placed on them. Two symmetrically arranged handles 239 are fixedly connected to the placing plate 232.

[0072] Refer to Figure 4 , Figure 5 and Figure 6, a pushing member 25 is installed on the conveying bracket 21. The pushing member 25 includes two fixing blocks 251 fixedly connected to the conveying bracket 21. The same fixing plate 252 is fixedly connected to the two fixing blocks 251. A second cylinder 253 is installed on the fixing plate 252. When the second cylinder 253 works, it can push the moving plate 231 to move upward, and further can make the steering system 24 move upward, thus ensuring that the steering system 24 can be normally tested. At the same time, two linear bearings 254 are penetrated through the fixing plate 252, and linear optical axes 255 connected to the moving plate 231 are penetrated through the two linear bearings 254;

[0073] Refer to Figure 7 , Figure 8 and Figure 9 , two symmetrically arranged supporting members 3 are installed on the workbench 1. The supporting member 3 includes a supporting frame 31 fixedly connected to the workbench 1. Two second guide rails 32 are fixedly connected to the supporting frame 31. A second guide block 33 matching with the second guide rails 32 is slidably connected to the two second guide rails 32. A first cylinder 34 is installed on the workbench 1. A supporting block 35 is installed at the output end of the first cylinder 34, which has the function of positioning and supporting the steering system 24.

[0074] Refer to Figure 8 and Figure 9, a fixture member 4 is installed on the support member 3. The fixture member 4 includes a support plate 41 fixedly connected to a plurality of second guide blocks 33. Two symmetrically arranged mounting brackets 42 are fixedly connected to the support plate 41. A screw drive mechanism 43 is installed on one of the mounting brackets 42, including a servo motor, a coupling, a screw rod, and a screw rod sleeve. The drive shaft of the servo motor is installed with a coupling, one end of the coupling is installed with a screw rod, the screw rod sleeve is sleeved on the screw rod, and one end of the screw rod sleeve is connected to a push rod 44. The output end of the screw drive mechanism 43 is installed with the push rod 44. One end of the push rod 44 passes through the side wall of the other mounting bracket 42 and extends to the outside. A pressing head 45 matching the steering system 24 is installed at one end of the push rod 44, and a part of the support block 35 is connected to the pressing head 45. A plurality of limit seats 46 are fixedly connected to the support plate 41. Two guide rods 47 are arranged between the plurality of limit seats 46. A clamping member 48 is arranged at the connection between the push rod 44 and the screw drive mechanism 43. One end of each of the two guide rods 47 passes through the clamping member 48 and extends to one side. A clamping switch 49 is installed on the side wall of the support frame 31. The clamping switch 49 is a sensor, and a manually locked switch is installed on the side wall of the clamping switch, similar to locking by turning a screw. When the clamping switch 49 is squeezed by the contact plate 450, the clamping member 48 can achieve the clamping function, and the manually locked switch can also achieve the purpose of manual locking. A contact plate 450 is fixedly connected to the support plate 41 on one side of the clamping switch 49. It should be noted in particular that a fixator is installed on the clamping block 481. The fixator is composed of a gear meshing mechanism, a turning handle, and a three-jaw chuck. When the push rod 44 is inserted into the fixator, the operator turns the turning handle, and with the assistance of the gear meshing mechanism, the three-jaw chuck can be rotated, and further the jaws in the three-jaw chuck can grip the push rod 44, further preventing the push rod 44 from falling off. At the same time, the gear meshing mechanism is composed of two skew gears meshing with each other, one skew gear is horizontally placed, and the other skew gear is vertically placed. When the other skew gear rotates, the driving end of the three-jaw chuck can be rotated, so that the push rod 44 can be clamped. At the same time, a pressure sensor is arranged on one side of the pressing head 45, a sleeve is installed on one side of the fixator, one end of the push rod 44 is inserted into the sleeve, and a pin is installed on the sleeve. When the operator inserts the pin, and the push rod 44 is provided with a jack matching the pin, the push rod 44 can be fixed.

[0075] Refer to Figure 9 , Figure 10 and Figure 11, the clamping member 48 includes a clamping block 481 installed at the connection of the push rod 44 and the lead screw drive mechanism 43. There are two mounting holes 482 on the clamping block 481. Thin cylinders 483 are penetrated through the two mounting holes 482. One end of each of the two guide rods 47 passes through the side walls of the two thin cylinders 483 and extends to the outside. Mounting discs 484 are installed on the side walls of the two thin cylinders 483. A set of input holes 485 are provided on the clamping block 481, and a set of output holes 486 are provided on the clamping block 481. It should be particularly noted that both the input holes 485 and the output holes 486 are connected with oil supply pipes. When hydraulic oil enters the gap between the thin cylinder 483 and the clamping block 481 from the input hole 485, with the continuous entry of the hydraulic oil, the thin cylinder 483 can be deformed, and further the clamping block 481 can be fixed on the guide rod 47. When loosening is required, at this time, another oil supply pipe is opened, so that the hydraulic oil can be discharged accordingly. At this time, when the lead screw drive mechanism 43 works, the clamping block 481 can be moved, and further the pressure head 35 can be moved accordingly. One side of the clamping block 481 is provided with a spring block. Two springs are fixedly connected to the side wall of the spring block, and optical rods are provided in both of the two springs. The two ends of the two optical rods extend into the spring block and the clamping block 481 respectively. The optical rods and the spring block can play a buffering role. When the pressure head 45 is conveyed forward too much, the spring can retract, further achieving the purpose of protecting the pressure sensor. At the same time, the guide rods 47 pass through the side walls of the spring block and extend to the outside respectively. The spring block is on one side of the clamping block 481.

[0076] Referring to Figure 12 and Figure 13 , an adjusting member 5 is installed on the workbench 1. The adjusting member 5 includes a placement rack 51 fixedly connected to the workbench 1. The placement rack 51 is above one of the lead screw drive mechanisms 43. A plurality of third guide rails 52 are fixedly connected to the placement rack 51. A plurality of first sliders are slidably connected to the plurality of third guide rails 52, and the same connecting plate 53 is fixedly connected to the plurality of first sliders. A lead screw member is also installed on the placement rack 51, and the structure of the lead screw member here is the same as that of the locking lead screw member 55. The lead screw member is connected to the connecting plate 53, further achieving the purpose of movement and limitation.

[0077] A plurality of fourth guide rails 54 are fixedly connected to the connecting plate 53. A plurality of second sliders are slidably connected to the fourth guide rails 54, and the same mounting plate 56 is fixedly connected to the plurality of second sliders. A locking screw member 55 connected to the mounting plate 56 is installed on the connecting plate 53. It should be particularly noted that the locking screw member 55 includes a sleeve, a screw, a screw nut and a rotating handle. The sleeve is fixed to the connecting plate 53 through a fixed seat, and the screw is rotatably connected in the sleeve. A strip-shaped opening matching the screw nut is provided on the sleeve. The screw nut is composed of a nut and a connecting block. The connecting block matches the strip-shaped opening and is connected to the mounting plate 56. A rotating handle is installed at one end of the screw. When the staff rotates the rotating handle, the position of the mounting plate 56 can be changed, further facilitating the work of the staff;

[0078] A fixed frame 57 is fixedly connected to the mounting plate 56. Two fifth guide rails 59 are installed on the fixed frame 57 through a plurality of first rotating blocks 58. The first rotating blocks 58 are rotatably connected to the fixed frame 57. Two inclined plates 512 are respectively installed on the two fifth guide rails 59 through second rotating blocks 510. The inclined plates 512 are rotatably connected to the second rotating blocks 510. The second rotating blocks 510 are slidably connected to the fifth guide rails 59. An adjusting cylinder 511 hinged to the inclined plate 512 is installed obliquely on the fixed frame 57.

[0079] Referring to Figure 14 and Figure 15 , a torque member 6 is installed on the adjusting member 5. The torque member 6 includes two sixth guide rails 61 installed on the side wall of the inclined plate 512. The same connecting fixing plate 62 is installed on the two sixth guide rails 61. Third sliders are slidably connected to the two sixth guide rails 61, and the two third sliders are respectively connected to the connecting fixing plate 62. At the same time, a connecting fixing frame 63 is fixedly connected to the side wall of the connecting fixing plate 62. A servo motor 64 is installed on the connecting fixing frame 63. A coupling 65 is installed at the output end of the servo motor 64. A torque protector 66 is installed at one end of the coupling 65. It should be particularly noted that the torque protector 66 is a prior art. At the same time, a torque sensor is installed on the torque protector 66. When the torque force is relatively large, the torque protector 66 can be disengaged, further serving the purpose of protecting the product. A cartridge 67 is installed at the lower end of the torque protector 66, and the cartridge 67 can hold the product. A third cylinder 68 is installed on the side wall of the connecting fixing plate 62. A fixed vertical plate 69 is installed at the output end of the third cylinder 68. A cylinder clamp 610 is fixedly connected to the side wall of the fixed vertical plate 69. A jaw 611 is installed at the output end of the cylinder clamp 610, and the jaw 611 is located below the cartridge 67, for the purpose of clamping and limiting the product. A fourth cylinder 612 is installed on the inclined plate 512, and the output end of the fourth cylinder 612 is connected to the connecting fixing frame 63 to ensure the normal displacement of the servo motor 64.

[0080] Refer to Figure 16 , a detecting member 7 is installed on the workbench 1. The detecting member 7 includes two vertical columns 71 fixedly connected thereto. The upper ends of the two vertical columns 71 are fixedly connected to the same cross plate 72. A notch is provided on the side wall of the cross plate 72, and the cartridge 67 is located below the notch. The lower end of the cross plate 72 is fixedly connected to an installation vertical frame 73. An installation bracket 74 is installed on the installation vertical frame 73. A connector 75 in contact with the steering system 24 is installed on the installation bracket 74. A noise mechanism at the motor, a noise mechanism at the synchronous belt, and a noise mechanism at the meshing part are installed on the installation bracket 74. It should be particularly noted that the connector 75 includes an electrical plug and a cylinder. The cylinder can drive the electrical plug to insert into the steering system 24 to provide power to the steering system 24. The noise mechanism at the motor, the noise mechanism at the synchronous belt, and the noise mechanism at the meshing part are all patch-type vibration sensors. They are not shown in the figure. This is the prior art and will not be elaborated here. The electrical plug can be inserted into the product for power supply to the product;

[0081] The automotive steering system testing device includes the following testing methods:

[0082] Testing of the noise performance of the steering system:

[0083] Step S1: Start the lead screw drive mechanism 43 to provide a load to the steering system 24, and then start the servo motor 64 and the fourth cylinder 612 to provide a rotational force to the steering system 24;

[0084] Condition 1: The lead screw drive mechanism 43 provides a 50% load, i.e., 8.25 KN, and the servo motor (64) has a uniform input shaft speed of 60 RPM;

[0085] Condition 2: The lead screw drive mechanism 43 provides a 90% load, i.e., 14.85 KN, and the servo motor 64 has a uniform input shaft speed of 60 RPM;

[0086] Condition 3: The lead screw drive mechanism 43 provides a 40% load, i.e., 6.6 KN, and the servo motor 64 accelerates uniformly from 0 to 90 RPM;

[0087] Step S2: Use multiple patch-type vibration sensors to collect noise signals at the radial direction of the motor, at the synchronous belt, and at a position 100 mm from the meshing end face;

[0088] Step S3: Analyze the noise frequency spectrum band of 20 - 20 kHz to determine whether there is abnormal noise, whistling, or resonance. Multiple patch-type vibration sensors collect data synchronously, the sampling frequency ≥ 20 kHz, and the data is subjected to high-pass filtering (cut-off frequency 100 Hz) to eliminate the interference of the servo motor;

[0089] No-load torque test:

[0090] Step S1: The input shaft of the servo motor 64 rotates clockwise from the straight position to the maximum right turn angle at a speed of 5 rpm ± 5%, then rotates counterclockwise to the maximum left turn angle, then the input shaft rotates forward at 5 rpm to 90% of the maximum right turn angle (CW) of the steering gear, and finally the input shaft rotates counterclockwise at 5 rpm back to the starting position, while recording the torque and angle curve;

[0091] Step S2: Record and plot the rotational torque-angle curve, and record the maximum value and fluctuation of the input shaft;

[0092] Step S3: After the data is processed by band-pass filtering, determine whether it meets the symmetry and hysteresis indexes (symmetry ≥ 95%, H40 ≤ 1.6 Nm and H80 ≤ 2.01.6 Nm);

[0093] Power assist performance test method:

[0094] Including static performance test and dynamic performance test:

[0095] The static performance test is as follows:

[0096] Step S1: The input shaft of the servo motor 64 rotates clockwise CW to -10 Nm, 0 Nm and 10 Nm at a speed of 5° / s, that is, 0.833 rpm;

[0097] Step S2: Record and plot the rotational torque-angle curve;

[0098] Step S3: After the data is processed by band-pass filtering, determine whether it meets the symmetry and hysteresis indexes (symmetry ≥ 95%, H40 ≤ 1.6 Nm and H80 ≤ 2.01.6 Nm);

[0099] Dynamic performance test:

[0100] Step S1: Condition 1: The screw drive mechanism 43 provides a 20% load, that is, 3.3 KN, and the rotational speed of the input shaft of the servo motor 64 is 600° / s;

[0101] Condition 2: The screw drive mechanism 43 provides a 100% load, that is, 16.5 KN, and the rotational speed of the input shaft of the servo motor 64 is 360° / s;

[0102] Step S2: Record and plot the rotational torque-angle curve;

[0103] Step S3: After the data is processed by band-pass filtering;

[0104] Judgment result: Condition 1: Input shaft torque ≤ 7 Nm, torque fluctuation range: TBD;

[0105] Condition 2: Input shaft torque ≤ 5 Nm, torque fluctuation range: TBD.

[0106] In the present invention, when the staff needs to use this device, the robotic arm can be used to place the steering system 24 on the support frame 236 first. With the assistance of the positioning pin 238 and the support frame 236, the steering system 24 can be supported and positioned. There are two pulleys provided in the pushing conveyor line 22. The two pulleys are connected by a belt drive, and a motor is provided on one side of one of the pulleys. When the motor works, the two pulleys can rotate, and further the belt can move. It should be particularly noted that the belt is in contact with the placing plate 232 in the placing member 23, and there is a certain frictional force between the two, so that the placing member 23 can move normally on the pushing conveyor line 22, and further the steering system 24 can be moved to a suitable position. Then, at this time, the second cylinder 253 works, so that the steering system 24 can move upward, so that the steering system 24 can reach a suitable height, thus preparing for the subsequent detection of the steering system 24.

[0107] At this time, the lead screw drive mechanism 43 works accordingly, so that the pressing head 45 can be stuck on the steering system 24, and further a certain load force can be provided to the steering system 24;

[0108] When the steering system 24 is limited and has a load force, at this time, the staff can move the connecting plate 53 according to the actual situation, so that the position of the connecting plate 53 can be changed accordingly. At the same time, the staff can start the adjusting cylinder 511, so that the angle of the inclined plate 512 can be changed, further facilitating the staff to adjust the position and angle of the servo motor 64. At this time, the staff starts the third cylinder 68, so that the clamping cylinder 67 can be inserted into the steering system 24. Then, when the servo motor 64 works, the steering system 24 can be detected. At the same time, during the detection process, the electrical plug can be inserted into the steering system 24 under the drive of the cylinder, so that the steering system 24 can obtain power to ensure the normal detection of the steering system 24.

[0109] Finally, several points should be noted: First, in the description of the present application, it should be noted that unless otherwise specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense, which can be a mechanical connection or an electrical connection, or the communication inside two components, and can be directly connected. "Up", "down", "left", "right", etc. are only used to represent the relative position relationship. When the absolute position of the described object changes, the relative position relationship may change;

[0110] Second: In the drawings of the disclosed embodiments of the present invention, only the structures related to the disclosed embodiments of the present disclosure are involved. For other structures, reference can be made to the usual designs. Without conflict, the same embodiment and different embodiments of the present invention can be combined with each other;

[0111] Finally, the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. An automotive steering system testing device, comprising a workbench (1), characterized in that; On one side of the workbench (1), there is a conveying member (2) capable of conveying the product to be measured. The conveying member (2) is located at the middle notch position of the workbench (1), and the conveying member (2) includes a steering system (24). A supporting member (3) capable of lifting the product to be measured is installed on the conveying member (2). The supporting member (3) includes a support frame (31) and two second guide rails (32). Two fixture members (4) capable of clamping the product to be measured and providing a load force are installed on the workbench (1). The two fixture members (4) are symmetrically arranged. The fixture member (4) includes a support plate (41) fixedly connected to a plurality of second guide blocks (33). Two symmetrically arranged mounting frames (42) are fixedly connected to the support plate (41). A lead screw driving mechanism (43) is installed on one of the mounting frames (42). The output end of the lead screw driving mechanism (43) is provided with a push rod (44). One end of the push rod (44) passes through the side wall of the other mounting frame (42) and extends to the outside. A pressing head (45) matching the steering system (24) is installed at one end of the push rod (44). And a support block (35) is connected to a part of the pressing head (45). A plurality of limit seats (46) are fixedly connected to the support plate (41). Two guide rods (47) are arranged between the plurality of limit seats (46). A clamping member (48) is arranged at the connection between the push rod (44) and the lead screw driving mechanism (43). And one ends of the two guide rods (47) respectively pass through the clamping member (48) and extend to one side. A clamping switch (49) is installed on the side wall of the support frame (31). And a contact plate (450) located on one side of the clamping switch (49) is fixedly connected to the support plate (41). An adjusting member (5) is installed on the workbench (1). The adjusting member (5) includes a placement rack (51) fixedly connected to the workbench (1). A plurality of third guide rails (52) are fixedly connected to the placement rack (51). A plurality of first sliders are slidably connected to the plurality of third guide rails (52). The plurality of first sliders are fixedly connected to the same connecting plate (53). A plurality of fourth guide rails (54) are fixedly connected to the connecting plate (53). A plurality of second sliders are slidably connected to the fourth guide rails (54). The plurality of second sliders are fixedly connected to the same mounting plate (56). A locking lead screw member (55) connecting the connecting plate (53) and the mounting plate (56) is installed on the connecting plate (53). A fixing frame (57) is fixedly connected to the mounting plate (56). The fixing frame (57) is provided with two fifth guide rails (59) through a plurality of first rotating blocks (58). The first rotating block (58) is rotatably connected to the fixing frame (57). The two fifth guide rails (59) are respectively provided with a sloping plate (512) through a second rotating block (510). The sloping plate (512) is rotatably connected to the second rotating block (510). The second rotating block (510) is slidably connected to the fifth guide rail (59). An adjusting cylinder (511) hinged to the sloping plate (512) is obliquely installed on the fixing frame (57). A torque member (6) is installed on the adjusting member (5). The torque member (6) can adjust the angle and position through the adjusting member (5). A detection piece (7) is installed on the workbench (1), and the detection piece (7) is located above the conveying piece (2); the detection piece (7) includes two vertical columns (71) fixedly connected, and the upper ends of the two vertical columns (71) are fixedly connected with the same cross plate (72). There is a notch on the side wall of the cross plate (72), and the clamping cylinder (67) is located below the notch. The lower end of the cross plate (72) is fixedly connected with an installation vertical frame (73), an installation bracket (74) is installed on the installation vertical frame (73), and a connector (75) in contact with the steering system (24) is installed on the installation bracket (74).

2. The automotive steering system testing device according to claim 1, wherein: The conveying piece (2) includes a conveying bracket (21) arranged at the middle position of the workbench (1). A pushing conveying line (22) is installed on the conveying bracket (21). A placing piece (23) capable of placing the steering system (24) is placed on the pushing conveying line (22). The steering system (24) is an R-EPS steering system, and the same pushing piece (25) is installed on the pushing conveying line (22).

3. The automotive steering system testing device according to claim 2, characterized in that: The placing piece (23) includes a moving plate (231) placed on two pushing conveying lines (22). A placing plate (232) is fixedly connected to the moving plate (231). Two first guide rails (233) are fixedly connected to the placing plate (232). Two first guide blocks (234) matching with the first guide rails (233) are slidably connected to the two first guide rails (233). The same placing seat (235) is fixedly connected to the two first guide blocks (234). A support frame (236) is fixedly connected to the placing seat (235). The support frame (236) is a rectangular plate, and there is a V-shaped opening on the side wall of the rectangular plate. A vertical block (237) is fixedly connected to the placing plate (232). Two positioning pins (238) are fixedly connected to the vertical block (237). Two symmetrical handles (239) are fixedly connected to the placing plate (232).

4. The automotive steering system testing device according to claim 2, characterized in that: The pushing piece (25) includes two fixed blocks (251) fixedly connected to the conveying bracket (21). The same fixing plate (252) is fixedly connected to the two fixed blocks (251). A second cylinder (253) is installed on the fixing plate (252). Two linear bearings (254) penetrate through the fixing plate (252). Linear optical axes (255) connected to the moving plate (231) penetrate through the two linear bearings (254).

5. The testing device for an automotive steering system according to claim 1, wherein: The support piece (3) includes a support frame (31) fixedly connected to the workbench (1). Two second guide rails (32) are fixedly connected to the support frame (31). Second guide blocks (33) matching with the second guide rails (32) are slidably connected to the two second guide rails (32). A first cylinder (34) is installed on the workbench (1). A support block (35) is installed at the output end of the first cylinder (34).

6. The testing device for an automotive steering system according to claim 1, characterized in that: The torque member (6) includes two sixth guide rails (61) mounted on the side wall of the inclined plate (512). The same connecting fixed plate (62) is mounted on the two sixth guide rails (61). Third sliders are slidably connected to the two sixth guide rails (61), and the two third sliders are respectively connected to the connecting fixed plate (62). At the same time, a connecting fixed frame (63) is fixedly connected to the side wall of the connecting fixed plate (62). A servo motor (64) is mounted on the connecting fixed frame (63). A coupling (65) is mounted on the output end of the servo motor (64). A torque protector (66) is mounted at one end of the coupling (65). A clamping cylinder (67) is mounted at the lower end of the torque protector (66). A third cylinder (68) is mounted on the side wall of the connecting fixed plate (62). A fixed vertical plate (69) is mounted on the output end of the third cylinder (68). A cylinder clamp (610) is fixedly connected to the side wall of the fixed vertical plate (69). A clamping jaw (611) is mounted on the output end of the cylinder clamp (610).

7. The test method of an automotive steering system test device according to any one of claims 1-6, characterized in that: Steering system noise performance test: Step S1: Start the lead screw drive mechanism (43) to provide a load to the steering system (24), and then start the servo motor (64) and the fourth cylinder (612) to provide a rotational force to the steering system (24); Condition 1: The lead screw drive mechanism (43) provides a 50% load, i.e., 8.25 KN, and the servo motor (64) has a uniform input shaft speed of 60 RPM; Condition 2: The lead screw drive mechanism (43) provides a 90% load, i.e., 14.85 KN, and the servo motor (64) has a uniform input shaft speed of 60 RPM; Condition 3: The lead screw drive mechanism (43) provides a 40% load, i.e., 6.6 KN, and the servo motor (64) accelerates uniformly from 0 to 90 RPM; Step S2: Use multiple patch type vibration sensors to collect noise signals at the radial direction of the motor, at the synchronous belt, and at a position 100 mm from the meshing end face; Step S3: Analyze the noise frequency spectrum band of 20 - 20 kHz to determine whether there is abnormal noise, whistling or resonance. Multiple patch type vibration sensors collect data synchronously, the sampling frequency ≥ 20 kHz, and the data is filtered by high-pass filter to eliminate the interference of the servo motor; No-load torque test: Step S1: Rotate the input shaft of the servo motor (64) clockwise from the straight position to the maximum right turn angle at a speed of 5 rpm ± 5%, then rotate counterclockwise to the maximum left turn angle, then rotate the input shaft at 5 rpm and then rotate forward to 90% of the maximum right turn angle (CW) of the steering gear, and finally rotate the input shaft at 5 rpm and then rotate counterclockwise back to the starting position, while recording the torque and angle curve; Step S2: Record and draw the rotational torque angle curve, and record the maximum value and fluctuation amount of the input shaft; Step S3: After the data is processed by band-pass filtering, determine whether it meets the symmetry and hysteresis indexes; Power assist performance test method: It includes static performance test and dynamic performance test: The static performance test is as follows: Step S1: The input shaft of the servo motor (64) rotates clockwise (CW) at a speed of 5° / s (i.e., 0.833 rpm) to -10 Nm, 0 Nm, and 10 Nm respectively; Step S2: Record and plot the rotational torque - angle curve; Step S3: After the data is processed by band - pass filtering, determine whether it meets the symmetry and hysteresis indices; Dynamic performance test: Step S1: Condition 1: The lead - screw drive mechanism (43) provides a 20% load, i.e., 3.3 kN, and the rotational speed of the input shaft of the servo motor (64) is 600° / s; Condition 2: The lead - screw drive mechanism (43) provides a 100% load, i.e., 16.5 kN, and the rotational speed of the input shaft of the servo motor (64) is 360° / s; Step S2: Record and plot the rotational torque - angle curve; Step S3: After the data is processed by band - pass filtering; Judgment result: Condition 1: The torque of the input shaft ≤ 7 Nm, torque fluctuation range: TBD; Condition 2: The torque of the input shaft ≤ 5 Nm, torque fluctuation range: TBD.

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