CN212110305U - Transmission shaft torsional vibration testing device and system of automobile - Google Patents
Transmission shaft torsional vibration testing device and system of automobile Download PDFInfo
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- CN212110305U CN212110305U CN202020718306.1U CN202020718306U CN212110305U CN 212110305 U CN212110305 U CN 212110305U CN 202020718306 U CN202020718306 U CN 202020718306U CN 212110305 U CN212110305 U CN 212110305U
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Abstract
The utility model provides a transmission shaft torsional vibration testing arrangement of car, the car includes transmission shaft, torque distributor, the transmission shaft output is equipped with and is used for connecting torque distributor's ring flange, torque distributor's input shaft install in ring flange rear end face, testing arrangement is including the test code wheel, the test code wheel install in the ring flange front end. The utility model discloses still disclose the transmission shaft torsional vibration test system of the car of the transmission shaft torsional vibration testing arrangement of including above-mentioned car. The utility model provides a transmission shaft torsional vibration testing arrangement and test system of car has guaranteed transmission shaft and torque distributor's relative installation accuracy through installing the test code wheel in the ring flange front end of transmission shaft to guaranteed that test signal is effective, reliable and stable.
Description
Technical Field
The utility model relates to a four wheel drive automobile model technical field especially relates to a transmission shaft torsional vibration testing arrangement and test system of car.
Background
Compared with a front-wheel drive vehicle, the four-wheel drive vehicle mainly has the advantages that a transfer case, a transmission shaft, a rear differential mechanism, a rear left driving shaft, a rear right driving shaft and the like are added on hardware, so that the NVH problem of the whole vehicle is more and more complex. If the torsional mode of the transmission shaft is not reasonably matched, the primary harmonic excitation of the engine will excite the mode, thereby causing rear row rolling in the vehicle. In the aspect of a solution, whether a torsional vibration absorber or a modal frequency avoidance is added, or excitation of a corresponding rotating speed is reduced by a control strategy, and the like, the excitation size and the modal region of the transmission shaft are judged by a torsional vibration signal of the transmission shaft.
The existing method is to measure the passing time of a black and white code disc by laser to calculate the torsional vibration of a transmission shaft. The main realization method comprises the following steps: fixing a black-and-white coded disc between the transmission shaft and the torque distributor, fixing a probe of a laser sensor on a shell of the torque distributor, emitting laser to the black-and-white coded disc by the probe of the laser sensor, and finally calculating the rotating speed and torsional vibration information of the position according to the reflection time of the laser. And the black-and-white coded disc with a certain thickness is arranged between the transmission shaft and the torque distributor, so that the assembly precision of a test vehicle is influenced, other types of faults are easy to occur to the vehicle, and other characteristic interferences can occur to a test signal.
The foregoing description is provided for general background information and is not admitted to be prior art.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a can guarantee transmission shaft torsional vibration testing arrangement and test system of effective, reliable and stable car of test signal.
The utility model provides a transmission shaft torsional vibration testing arrangement of car, the car includes transmission shaft, torque distributor, the transmission shaft output is equipped with and is used for connecting torque distributor's ring flange, torque distributor's input shaft install in ring flange rear end face, testing arrangement is including the test code wheel, the test code wheel install in the ring flange front end.
Furthermore, the testing device further comprises a sensing device, wherein the sensing device is fixed on the torque distributor and is arranged opposite to the testing coded disc, and is used for detecting the testing coded disc and outputting different square wave signals so as to obtain the rotating speed and torsional vibration information of the output end of the transmission shaft.
Further, the test code disc comprises a disc and a black and white disc fixed on the disc, a plurality of black strips and white strips are uniformly distributed around the center of the black and white disc, the white strips are located between every two black strips, the sensing device is a photoelectric sensor used for detecting the black strips or the white strips, and laser emitted by the photoelectric sensor is opposite to the black strips or the white strips.
Furthermore, a plurality of empty grooves and a plurality of grating strips are arranged on the test code disc, the grating strips are formed between every two empty grooves, and the grating strips are uniformly distributed around the center of the test code disc.
Furthermore, sensing device is for being used for detecting the magneto-electric sensor of grating strip or dead slot, testing arrangement still includes sensing device support, magneto-electric sensor passes through sensing device support is fixed in torque distributor.
Further, magnetoelectric sensor is including detecting the head, it is just right to detect the head grating strip setting, detect the head with the installation distance between the test code wheel is 1 ~ 2 mm.
Furthermore, a first through hole used for being sleeved in the flange plate is formed in the middle of the test coded disc, and the circumferential axis where the plurality of grating strips are located is overlapped with the axis of the first through hole.
Furthermore, the testing device also comprises two fixing pieces for fixing the testing coded disc on the flange plate after the testing coded disc is sleeved in the flange plate, and the two fixing pieces are symmetrically fixed on the left side and the right side of the testing coded disc.
Furthermore, a second through hole distributed around the center of the test code disc is formed in the test code disc, a first fixing hole is formed in the fixing plate corresponding to the second through hole, and the fixing plate and the test code disc are fixedly assembled by inserting a fastener into the second through hole and the first fixing hole; the front end of the flange plate is provided with a connecting piece, the fixing plate is further provided with a second fixing hole, and the second fixing hole is sleeved on the connecting piece to fix the fixing plate on the flange plate.
The utility model also provides a transmission shaft torsional vibration test system of car, include as above transmission shaft torsional vibration testing arrangement and data acquisition module, data acquisition module connects sensing device, data acquisition module basis the signal calculation of sensing device output the rotational speed and the torsional vibration information of transmission shaft output.
The utility model provides a transmission shaft torsional vibration testing arrangement and test system of car has guaranteed transmission shaft and torque distributor's relative installation accuracy through installing the test code wheel in the ring flange front end of transmission shaft to guaranteed that test signal is effective, reliable and stable.
Drawings
Fig. 1 is an exploded schematic view of a transmission shaft torsional vibration testing apparatus of an automobile according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a test code wheel of the transmission shaft torsional vibration test device of the automobile shown in fig. 1.
Fig. 3 is a schematic top view of a stator of the torsional vibration testing apparatus for a propeller shaft of the vehicle shown in fig. 1.
FIG. 4 is a side view of a stator of the torsional vibration testing apparatus for a driveshaft of the vehicle of FIG. 1.
Fig. 5 is a schematic perspective view of a testing code disc and a fixing plate of the torsional vibration testing device for a transmission shaft of the automobile shown in fig. 1.
Fig. 6 is a schematic top view of a sensor mount of the torsional vibration testing apparatus for a propeller shaft of the vehicle shown in fig. 1.
Fig. 7 is a side view of a sensor mount of the torsional vibration testing apparatus of the propeller shaft of the vehicle shown in fig. 1.
FIG. 8 is an exploded view of the assembly relationship between the testing code disc and the fixing plate of the second embodiment of the torsional vibration testing device for a transmission shaft of the automobile shown in FIG. 1.
Fig. 9 is a schematic structural diagram of a black and white disc of the transmission shaft torsional vibration testing device of the automobile shown in fig. 8.
Fig. 10 is a schematic top view of a disk of the propeller shaft torsional vibration testing apparatus of the vehicle shown in fig. 8.
FIG. 11 is a side view of a disk of the propeller shaft torsional vibration testing apparatus of the vehicle of FIG. 8.
Detailed Description
The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.
Fig. 1 to 4 show a first embodiment of a transmission shaft torsional vibration testing apparatus for an automobile according to the present invention. In the present embodiment, the automobile includes a propeller shaft 1 and a torque distributor 2. The output end of the transmission shaft 1 is provided with a flange 7 for connecting the torque distributor 2. The front end of the flange 7 is provided with a connector (not shown). In the embodiment, the connecting piece is a bolt, so that the connection is reliable and the assembly and disassembly are convenient. In other embodiments, the connection may also be a stud or the like. The input shaft of the torque divider 2 is mounted to the rear end face of the flange 7.
In this embodiment, the testing device includes a testing code disc 3, a sensing device 4, a sensing device bracket 5 and a fixing plate 6. The fixing piece 6 is used for fixing the test code disc 3 on the transmission shaft 1. The sensing device 4 is fixed on the torque distributor 2 through a sensing device support 5 and is arranged opposite to the test coded disc 3 to detect the test coded disc 3 and output different square wave signals, so that the rotating speed and torsional vibration information of the output end of the transmission shaft 1 are obtained.
As shown in FIG. 1, the testing coded disc 3 is arranged at the front end of the flange 7, the relative installation precision of the transmission shaft 1 and the torque distributor 2 is not changed, and therefore the stability and reliability of testing signals are guaranteed. In the embodiment, the test code disc 3 is a grating code disc, the concentricity of the grating code disc is high, and the grating code disc can be directly processed with precision. In other embodiments, the test code disc 3 can also be other code discs. In the embodiment, the diameter of the test code disc 3 is 163mm, the material is 45 steel, and the test code disc has high strength and good cutting machinability.
As shown in fig. 1, 2, and 5, in the present embodiment, the test code wheel is circular. The middle part of the test code disc 3 is provided with a first through hole 33 which can be sleeved into the flange 7, and the disc surface is provided with a plurality of empty grooves 31, a plurality of grating strips 32 and second through holes 34 distributed around the center of the test code disc 3. The first through hole 33 has a diameter of 100 mm. In this embodiment, a grating strip 32 is formed between every two empty grooves 31. A plurality of grating strips 32 are evenly distributed around the center of the test code disc 3 so that the sensing means 4 detects the test code disc 3. The circumferential axis where the grating strips 32 are located is overlapped with the axis of the first through hole 33, so that the concentricity of the grating strips 32 and the first through hole 33 is ensured, and the coaxiality of the grating strips 32 and the input shaft of the torque distributor 2 during operation is ensured.
In the present embodiment, as shown in fig. 2, the number of grating strips 32 is 60, and the angle θ formed by the left and right sides of each grating strip 32 and the center of the test code disc 3 is 3 °, so as to obtain a plurality of sets of different test data. In other embodiments, the number of grating strips 32 of the test code wheel 3 can be other values, such as 36 or 90. In this embodiment, the outer circle of the circumference where the plurality of grating strips 32 are located has a diameter of 158mm, and the inner circle has a diameter of 128 mm.
As shown in fig. 2 and 5, the second through hole 34 is located between the empty groove 31 and the grating strip 32 and the first through hole 33. In this embodiment, the number of the second through holes 34 is four, and the second through holes are symmetrically distributed at the upper end, the lower end, the left end and the right end of the test code disc 3, and are assembled by matching with the fixing plate 6. Wherein the distance L from the second through hole 34 at the upper end and the lower end to the center of the test code disc 3148.58mm respectively, and the distance L from the second through holes 34 on the left side and the right side to the center of the test code disc 32Respectively 27.58 mm. In this embodiment, the diameter of the second through hole 34 is 4.5 mm.
As shown in fig. 1, in this embodiment, the sensing device 4 is a magnetoelectric sensor, and is used to detect the grating strips 32 or the empty slots 31 of the test code wheel 3, so that the equipment cost is low, the detection signal is accurate, and the durability is strong. In other embodiments, the sensing device 4 may also be other sensors such as photoelectric sensors. In this embodiment, the magnetoelectric sensor includes a detection head (not shown).
As shown in fig. 1, 6, and 7, in the present embodiment, the sensor device holder 5 is a magneto-electric sensor holder. The sensor unit holder 5 is provided with a holder mounting hole 51 through which the sensor unit 4 passes and a holder fixing hole 52. The bracket mounting hole 51 is sized according to the outer dimensions of the sensor device 4. In this embodiment, the bracket mounting hole 51 has a diameter of 7 mm. The width W of the sensor device holder 5 is 18mm and the thickness is 1.5 mm.
The magnetoelectric sensor is fixed in torque distributor 2 through sensing device support 5, can overcome the influence that the vibration of transmission shaft 1 brought. The detection head is arranged on the grating strips 32 to output different signals, so as to obtain the rotating speed and torsional vibration information of the output end of the transmission shaft 1. The mounting distance between the detection head and the test code disc 3 is 1-2 mm, so that the test code disc 3 is ensured to be detected, and the test is ensured to be effective. In other embodiments, the detection head and the test code disc 3 can be arranged at other distances, as long as the working distance range specified by the magnetoelectric sensor is ensured.
As shown in fig. 3, 4 and 5, the fixing piece 6 is used to fix the test code wheel 3 to the flange 7 after the test code wheel 3 is inserted into the flange 7. In this embodiment, the fixing piece 6 is made of 45 steel, and has high strength and good machinability. In this embodiment, the thickness of the fixing piece 6 is 2 mm. In this embodiment, the number of the fixing pieces 6 is two. The two fixing pieces 6 are symmetrically fixed on the left side and the right side of the test code disc 3 to ensure that the test code disc 3 is fixed on the transmission shaft 1 in a balanced manner.
The fixing piece 6 is provided with a second fixing hole 62 and a first fixing hole 61 corresponding to the second through hole 34. The first fixing hole 61 and the second fixing hole 62 are respectively located at the upper and lower ends of the fixing piece 6, and the central distance L between the first fixing hole and the second fixing hole4Is 21 mm.
As shown in fig. 3, in the present embodiment, the number of the first fixing holes 61 is two, and the diameter thereof is 4.5 mm. The number of the second fixing holes 62 is two, and the diameters thereof are 10.5 mm. The distance L from the center of the two second fixing holes 62 to the central axis of the fixing sheet 63Respectively 27.58 mm. The center of the second fixing hole 62 is spaced from the lower bottom surface of the fixing piece 6 by a distance of27 mm. The fixing piece 6 and the test code disc 3 are fixedly assembled by inserting the fastener 8 into the second through hole 34 and the first fixing hole 61; the second fixing hole 62 is sleeved on the connecting piece of the flange 7 to fix the fixing piece 6 on the flange 7, so that the test code disc 3 is mounted at the front end of the flange 7. In the embodiment, the fastener is an M4 bolt, so that the structure is simple and the connection is reliable. In other embodiments, the fasteners may also be screws or the like.
The specific assembling steps of the torsional vibration testing device for the transmission shaft of the embodiment are as follows:
(1) firstly, the testing coded disc 3 is arranged at the front end of the flange 7. Firstly, sleeving a first through hole 33 of a test coded disc 3 into the front end of a flange 7 at the output end of a transmission shaft 1 in advance; the two fixing pieces 6 are tightly attached to the test code disc 3 and are respectively inserted into the four second through holes 34 of the test code disc 3 and the four first fixing holes 61 of the two fixing pieces 6 through fasteners; the fixing plate 6 and the test code wheel 3 are then fixedly assembled by screwing M4 nuts (not shown) into the fasteners. Then, the second fixing hole 62 of the fixing plate 6 is sleeved on the connecting piece of the flange 7, that is, the fixing plate 6 is fixed on the flange 7, and finally, the test code disc 3 is installed at the front end of the flange 7.
(2) The input shaft of the torque divider 2 is then mounted to the rear end face of the flange 7. And according to the assembly requirement, the input shaft of the torque distributor 2 and the rear end face of the flange 7 at the output end of the transmission shaft 1 are normally assembled and connected.
(3) Finally, the magnetoelectric sensor is fixed to the torque distributor 2. Fixing the sensing device bracket 5 to the shell of the torque distributor 2 through the bracket fixing hole 52, and then fixing the magneto-electric sensor to the sensing device bracket 5 through the bracket mounting hole 51, so that the magneto-electric sensor is fixed on the torque distributor 2; then, the detection head of the magnetoelectric sensor is ensured to be opposite to the grating strip 32, and the distance between the detection head and the grating strip is within the range of 1-2 mm.
This embodiment transmission shaft torsional vibration testing arrangement carries out test work during: the test coded disc 3 is integrated with the output end of the transmission shaft 1 and the input shaft of the torque distributor 2 and rotates along with the transmission shaft 1; the sensor device bracket 5 is arranged on the shell of the torque distributor 2, so that the transverse motion consistency of the magnetoelectric sensor and the test coded disc 3 is ensured, and the detection head of the magnetoelectric sensor and the grating strip 32 are relatively static except the rotating direction of the transmission shaft 1. When the magnetoelectric sensor detects the grating strips 32, the magnetoelectric sensor outputs a high-level signal; when the empty slot 31 is detected, the magnetoelectric sensor outputs a low level signal, along with the fluctuation of the rotating speed of the transmission shaft 1, the magnetoelectric sensor outputs a series of square wave signals with different interval durations, and the rotating speed and the torsional vibration signals at the rear end of the transmission shaft 1 can be obtained through a corresponding signal processing method. The testing device is convenient to test and stable in work, can measure the rotating speed and torsional vibration of the output end of the transmission shaft 1 in the running state, and provides data support for torsional mode matching of the transmission shaft 1 and NVH (noise, vibration and sound vibration roughness) analysis of the whole vehicle.
Fig. 8 to fig. 11 show a second embodiment of the transmission shaft torsional vibration testing apparatus for an automobile according to the present invention. In this embodiment, the test code disc is a black and white code disc. In the present embodiment, the test code wheel 3 includes a circular disk 36 and a black-and-white disk 37 fixed to the circular disk 36. The black and white disk 37 and the circular disk 36 have the same diameter. In this embodiment, the black-and-white disc 37 is adhered to the circular disc 36, and the concentricity of the two is ensured to ensure that the test signal is not interfered.
In this embodiment, the disc 36 has a diameter of 163mm and a thickness of 1.5mm, as shown in FIGS. 10 and 11. The disc 36 is provided with a disc mounting hole 361 for passing the drive shaft 1 therethrough and disc through holes 362 distributed around the center of the disc 36. The disc mounting hole 361 is located in the middle of the disc 36 and has a diameter of 100 mm. The specific arrangement position and diameter of the disk through hole 362 on the disk 36 in the present embodiment are the same as the arrangement position and diameter of the second through hole 34 on the test code wheel 3 in the first embodiment, and are not repeated here.
As shown in fig. 8 and 9, in the present embodiment, the black-and-white tray 37 is formed by black-and-white printing on a white sticker printing paper. The black-and-white disc 37 is provided with a plurality of black strips 371 and white strips 372 which are evenly distributed around the center of the black-and-white disc 37, and the white strips 372 are positioned between every two black strips 371. The black stripes 371 and white stripes 372 are the same height and are each 60 in number. The diameter of the inner circle of the circumference where the black strip and the white strip are located is 100 mm.
In this embodiment, the sensing device 4 is a photoelectric sensor for detecting the black strip 371 or the white strip 372 of the test code wheel 3, and has less limitation on the detected object and short response time. That is, in the present embodiment, the sensor device holder 5 is a photosensor holder. The photoelectric sensor is fixed to the torque distributor 2 by a sensor mount 5.
The laser that photoelectric sensor sent just faces black strip 371 or white strip 372, and when this embodiment transmission shaft torsional vibration testing arrangement carried out test work, photoelectric sensor can export different square wave signal to obtain the rotational speed and the torsional vibration information of transmission shaft 1 output.
The rest of the structure, the assembly steps and the working principle of the embodiment are the same as those of the first embodiment, and are not described herein again. (fixing piece 6 is mounted on the side of the black and white plate 37)
The utility model also provides an embodiment of transmission shaft torsional vibration test system of car, it includes the transmission shaft torsional vibration testing arrangement and the data acquisition module (not shown) that above-mentioned embodiment is disclosed, and sensing device 4 is connected to the data acquisition module, and the different square wave signal that data acquisition module exported according to sensing device 4 calculates the rotational speed and the torsional vibration information of 1 output of transmission shaft.
In this document, the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", "vertical", "horizontal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for the sake of clarity and convenience of description of the technical solutions, and thus, should not be construed as limiting the present invention.
As used herein, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, including not only those elements listed, but also other elements not expressly listed.
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. The utility model provides a transmission shaft torsional vibration testing arrangement of car, the car includes transmission shaft, torque distributor, the transmission shaft output is equipped with and is used for connecting torque distributor's ring flange, torque distributor's input shaft install in ring flange rear end face, a serial communication port, testing arrangement includes the test code wheel, the test code wheel install in the ring flange front end.
2. The torsional vibration testing apparatus for a transmission shaft of an automobile of claim 1, further comprising a sensing device fixed to the torque distributor and disposed opposite to the testing code disc for detecting the testing code disc and outputting different square wave signals to obtain the rotational speed and torsional vibration information at the output end of the transmission shaft.
3. The torsional vibration testing device for the transmission shaft of the automobile as claimed in claim 2, wherein the testing code disc comprises a disc and a black and white disc fixed on the disc, a plurality of black strips and white strips are uniformly distributed around the center of the black and white disc on the black and white disc, the white strips are positioned between every two black strips, the sensing device is a photoelectric sensor for detecting the black strips or the white strips, and laser emitted by the photoelectric sensor is opposite to the black strips or the white strips.
4. The automotive transmission shaft torsional vibration testing apparatus of claim 2, wherein the test code wheel is provided with a plurality of empty slots and a plurality of grating strips, the grating strips are formed between every two empty slots, and the grating strips are uniformly distributed around the center of the test code wheel.
5. The torsional vibration testing device for the transmission shaft of the automobile according to claim 4, wherein the sensing device is a magnetoelectric sensor for detecting the grating strips or the empty slots, the testing device further comprises a sensing device bracket, and the magnetoelectric sensor is fixed to the torque distributor through the sensing device bracket.
6. The automobile transmission shaft torsional vibration testing device of claim 5, wherein the magnetoelectric sensor comprises a detection head, the detection head is arranged right opposite to the grating strips, and the installation distance between the detection head and the testing code disc is 1-2 mm.
7. The automobile transmission shaft torsional vibration testing device as claimed in claim 4, wherein a first through hole for being sleeved in the flange plate is formed in the middle of the testing code disc, and a circumferential axis where the plurality of grating strips are located is overlapped with an axis of the first through hole.
8. The automobile transmission shaft torsional vibration testing device of claim 7, characterized in that the testing device further comprises two fixing pieces for fixing the testing coded disc on the flange plate after the testing coded disc is sleeved in the flange plate, and the two fixing pieces are symmetrically fixed on the left side and the right side of the testing coded disc.
9. The automotive transmission shaft torsional vibration testing device of claim 8, wherein the test code disc is provided with a second through hole distributed around the center of the test code disc, the fixing plate is provided with a first fixing hole corresponding to the second through hole, and the fixing plate and the test code disc are fixedly assembled by inserting a fastener into the second through hole and the first fixing hole; the front end of the flange plate is provided with a connecting piece, the fixing plate is further provided with a second fixing hole, and the second fixing hole is sleeved on the connecting piece to fix the fixing plate on the flange plate.
10. A transmission shaft torsional vibration test system of an automobile, characterized by comprising the transmission shaft torsional vibration test device according to any one of claims 2 to 9 and a data acquisition module, wherein the data acquisition module is connected with the sensing device, and the data acquisition module calculates the rotating speed and torsional vibration information of the output end of the transmission shaft according to the signal output by the sensing device.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020718306.1U CN212110305U (en) | 2020-04-30 | 2020-04-30 | Transmission shaft torsional vibration testing device and system of automobile |
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| CN202020718306.1U CN212110305U (en) | 2020-04-30 | 2020-04-30 | Transmission shaft torsional vibration testing device and system of automobile |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114441167A (en) * | 2021-12-30 | 2022-05-06 | 潍柴动力股份有限公司 | Code wheel support tool |
| CN116519115A (en) * | 2023-06-28 | 2023-08-01 | 江铃汽车股份有限公司 | Torsional vibration testing device of automobile hybrid power system |
| CN116793400A (en) * | 2023-08-18 | 2023-09-22 | 微传智能科技（常州）有限公司 | High-precision single-coding-disc absolute magnetic encoder measurement system |
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2020
- 2020-04-30 CN CN202020718306.1U patent/CN212110305U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114441167A (en) * | 2021-12-30 | 2022-05-06 | 潍柴动力股份有限公司 | Code wheel support tool |
| CN114441167B (en) * | 2021-12-30 | 2023-09-19 | 潍柴动力股份有限公司 | Code wheel support tool |
| CN116519115A (en) * | 2023-06-28 | 2023-08-01 | 江铃汽车股份有限公司 | Torsional vibration testing device of automobile hybrid power system |
| CN116519115B (en) * | 2023-06-28 | 2023-09-19 | 江铃汽车股份有限公司 | Torsional vibration testing device of automobile hybrid power system |
| CN116793400A (en) * | 2023-08-18 | 2023-09-22 | 微传智能科技（常州）有限公司 | High-precision single-coding-disc absolute magnetic encoder measurement system |
| CN116793400B (en) * | 2023-08-18 | 2023-11-03 | 微传智能科技（常州）有限公司 | High-precision single-coding-disc absolute magnetic encoder measurement system |
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