CN107192561A - A kind of wheel hub drives electric automobile Electric Motor Wheel suspension system testing stand - Google Patents
A kind of wheel hub drives electric automobile Electric Motor Wheel suspension system testing stand Download PDFInfo
- Publication number
- CN107192561A CN107192561A CN201710451112.2A CN201710451112A CN107192561A CN 107192561 A CN107192561 A CN 107192561A CN 201710451112 A CN201710451112 A CN 201710451112A CN 107192561 A CN107192561 A CN 107192561A
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- electric motor
- motor wheel
- swing arm
- sleeve
- goat
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M17/00—Testing of vehicles
- G01M17/007—Wheeled or endless-tracked vehicles
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M17/00—Testing of vehicles
- G01M17/007—Wheeled or endless-tracked vehicles
- G01M17/04—Suspension or damping
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Vehicle Body Suspensions (AREA)
Abstract
The present invention provides a kind of wheel hub driving electric automobile Electric Motor Wheel suspension system testing stand, including firm banking and total frame, firm banking is arranged on total frame lower end, draft hitch is provided with total frame, Electric Motor Wheel and drum apparatus, draft hitch is by upper swing arm, goat's horn and lower swing arm are constituted, realized and connected by the hinged block above total frame in one end of upper swing arm, the other end is hinged with goat's horn, the lower end of goat's horn is connected by one end of bulb and lower swing arm, the other end of lower swing arm is realized with the fixed block in total frame and is hinged, Electric Motor Wheel is arranged on the right-hand member of goat's horn, drum apparatus is arranged on below Electric Motor Wheel by roller cage.There is no mechanical transmission mechanism in integral electric wheel construction, compact conformation, transmission efficiency is high；To electric automobile under actual operating mode exercise test, vertical load simulation mechanism can simulate load, torque and the change of rotating speed of the Electric Motor Wheel under actual condition.Testing stand can carry out the electronic differential experiment and retardation test of Electric Motor Wheel.
Description
Technical field
The present invention relates to electric automobile field, more particularly to a kind of driving electric automobile Electric Motor Wheel suspension system experiment of wheel hub
Platform.
Background technology
The energy shortage of 21 century is to need two hang-ups of solution with environmental pollution.In the solution to the two problems
On, electric automobile has irreplaceable advantage.Electric automobile (BEV) refers to using vehicle power as power, and car is driven with motor
Wheel traveling, meets road traffic, the vehicle of security legislation requirements.Because the relatively conventional automobile of effect on environment is smaller, its
Prospect is had an optimistic view of extensively, but current techniques are still immature.And the current dynamic load test platform to Electric Motor Wheel, mainly concentrating is
Performance test to wheel hub motor this separate part in Electric Motor Wheel, it is impossible to the property of the complete reflection electronic wheel system of 1/4 vehicle body
Can, cause Electric Motor Wheel measurement accuracy not enough, influence the efficiency of research and development of electric automobile, therefore design a Electric Motor Wheel suspension system platform
Frame test platform, this exploitation to pure electric automobile has good reference value and application value.
The content of the invention
The present invention drives the actual demand of the exploitation of electric automobile Electric Motor Wheel suspension system and test based on wheel hub, designs a
New electric automobile Electric Motor Wheel-suspension vibration detection test platform.
The present invention provides a kind of wheel hub driving electric automobile Electric Motor Wheel suspension system vibration detection test platform, including exchange
Worm drive fixed mount, double yoke suspensions are installed in frame, total frame；It is provided with the top of worm drive fixed mount for suspension
The vertical load loading device that module applies；Double yoke suspension sides are provided with complete Electric Motor Wheel module, including goat's horn, brake
Disk, wheel hub motor, wheel rim and tire；Total bottom of the frame is fixed with the excitation system for producing accumulation signal, excitation system bag
Include driving source variable-frequency motor, amplitude regulating device；Excitation system top is provided with the drum apparatus for simulated roadway, simulation road
Surface roller device includes drum shaft, former, connects disk, cylinder skin；The worm drive fixed mount is connected firmly in total frame by bolt,
Described pair of yoke draft hitch is hinged in frame；The excitation system is connected firmly on chassis overhang by bolt.
Further improvement is that：The vertical load loading device is made up of rocking handle, spiral transmissioning rod, threaded nut；Shake
Realized and connected firmly by way of key interference between handle and spiral transmissioning rod；Threaded nut passes through periphery one with worm drive fixed mount
Circle bolt is fixed；Spiral transmissioning rod engages the displacement feeding realized in vertical direction by tooth with threaded nut.
Further improvement is that：The structure of the damper is：Including spring and damper, spring is compressed by end cap up and down
In certain stroke, damper realizes fixation with end cap up and down by way of connecting firmly.
Further improvement is that：The suspension module is made up of upper swing arm, goat's horn, lower swing arm；One end of upper swing arm passes through
Hinged block above total frame realizes connection, and the other end and the goat's horn of upper swing arm are hinged；The lower end of goat's horn passes through bulb and the bottom
The fixed block of one end connection of arm, the other end of lower swing arm and total frame, which is realized, to be hinged.
Further improvement is that：The road surface simulation device by drum shaft, connect disk, former, cylinder skin and constitute；Drum shaft is with connecing
Between disk fixation is realized using the mode of key interference；Connect between disk and former and to be connected firmly using the mode of welding to realize；Former with
Connected firmly between cylinder skin using the mode of welding to realize.
For mitigate road surface simulation device structure quality, need to be opened on each former four circular holes as light weight according to
According to the diameter for opening circular hole is shown as φ 15cm according to Finite element analysis results.
Further improvement is that：The excitation system is made up of driving source variable-frequency motor, shaft coupling, amplitude regulating device；
Amplitude regulating device is made up of exciting disk, drag link, vertical push rod, clutch disk, bolt and nut；Driving source variable-frequency motor passes through
Embedded bolt is realized to be connected with firm banking fixing device；Realized by way of key interference and variable-frequency motor one end of shaft coupling
Rotating shaft is connected, and the other end is realized with amplitude regulating device by key interference mode and is connected.
Further improvement is that：The roller cage is by longitudinal cylinder guide pillar, upper bush, lower sleeve, sleeve transition branch
Support set cylinder is constituted；Longitudinal cylinder guide pillar is arranged on the firm banking of perforate；Upper bush is arranged on longitudinal direction circle by center hole
On post guide rail, upper bush side is provided with the side opening for mounting rotary drum axle；Lower sleeve is arranged on longitudinal cylinder by center hole
On guide rail, lower sleeve side is provided with the side opening for fixing drag link；Transition stop sleeve is arranged on longitudinal direction by center hole
On cylindrical guide, transition stop sleeve upper end is realized with upper bush lower end by way of welding and fixed, and transition sleeve lower end leads to
The mode and lower sleeve upper end for crossing welding realize fixation；The other end is realized with amplitude regulating device using welding and connected firmly.So as to real
The now motor coordination of whole vibrational system.
Further improvement is that：Pressure sensor, pressure are installed between the vertical load loading device and damper
Realize and connect firmly that the other end utilizes real between bolt and damper with the principle that spiral transmissioning rod is engaged using tooth in one end of sensor
Now it is fitted close.
Further improvement is that：Displacement transducer is installed at the lower swing arm bulb of described pair of yoke, displacement transducer
Bottom can carry out the fixation in lower swing arm using liquid glue.
The beneficial effects of the invention are as follows：It is wheel hub motor is integrated with wheel, it is adaptable to two-wheeled or four motorized wheels
Without mechanical transmission mechanism in the middle of electric automobile, integral electric wheel construction, with compact conformation, the advantages of transmission efficiency is high；And
In addition to carrying out endurancing to Electric Motor Wheel, the exercise test under actual operating mode is alternatively arranged as to electric automobile, herein
On platform, vertical load simulation mechanism can simulate load, torque and the change of rotating speed of the Electric Motor Wheel under actual condition, can enter
Electronic differential experiment and retardation test of row Electric Motor Wheel etc.；Excitation system can simulate road roughness under different operating modes, pass through
The research and development offer technical support that electric automobile can be completed and the throwing for reducing fund are built to 1/4 Electric Motor Wheel suspension system testing stand
Enter, electric automobile is accelerated to put goods on the market to play key effect.
Brief description of the drawings
Fig. 1 is the structural front view of the present invention.
Fig. 2 is the structure left view of the present invention.
Fig. 3 is the Vertical loading apparatus structure schematic diagram of the present invention.
Fig. 4 is the amplitude regulating device structural representation of the present invention.
Wherein：1- firm bankings, the total frames of 2-, 3- Electric Motor Wheels, 4- drum apparatus, 5- upper swing arms, 6- goat's horns, the 7- bottoms
Arm, 8- hinged blocks, 9- fixed blocks, 10- roller cages, 11- longitudinal directions cylinder guide pillar, 12- upper bushes, 13- lower sleeves, 14- sets
Cylinder transition stop sleeve, 15- spiral transmissioning rods, 16- threaded nuts, 17- rocking handles, 18- worm drive fixed mounts, 19- driving sources
Variable-frequency motor, 20- shaft couplings, 21- amplitude regulating devices, 22- brake discs, 23- exciting disks, 24- drag links, 25- indulges push rod,
26- clutch disks, 27- dampers, 28- pressure sensors.
Embodiment
In order to deepen the understanding of the present invention, below in conjunction with embodiment, the invention will be further described, the embodiment
It is only used for explaining the present invention, is not intended to limit the scope of the present invention..
As Figure 1-4, a kind of wheel hub driving electric automobile Electric Motor Wheel suspension system testing stand, bag are present embodiments provided
Firm banking 1 and total frame 2 are included, the firm banking 1, which is arranged in total lower end of frame 2, total frame 2, is provided with suspension dress
Put, Electric Motor Wheel 3 and the drum apparatus 4 for simulated roadway, the draft hitch is made up of upper swing arm 5, goat's horn 6 and lower swing arm 7,
Realize and connect that the other end is hinged with goat's horn 6, the goat's horn 6 by the hinged block 8 of total top of frame 2 in one end of the upper swing arm 5
Lower end be connected by bulb with one end of lower swing arm 7, the fixed block 9 in the other end of lower swing arm 7 and total frame 2, which is realized, to be cut with scissors
Connect, the Electric Motor Wheel 3 is arranged on the right-hand member of goat's horn 6, the drum apparatus 4 is arranged under Electric Motor Wheel 3 by roller cage 10
Side.
The roller cage 10 is by longitudinal cylinder guide pillar 11, upper bush 12, lower sleeve 13 and sleeve transition stop sleeve
14 are constituted, and longitudinal cylinder guide pillar 11 is arranged on the firm banking 1 of perforate；Upper bush 12 is arranged on vertical by center hole
To on cylinder guide pillar 11, the side of upper bush 12 is provided with the side opening for mounting rotary drum axle；Lower sleeve 13 is installed by center hole
On longitudinal cylinder guide pillar 11, lower sleeve（13）Side is provided with side opening, and sleeve transition stop sleeve 14 is installed by center hole
On longitudinal cylinder guide pillar 11, the upper end of sleeve transition stop sleeve 14 is realized solid by way of welding with the lower end of upper bush 12
Fixed, the lower end of sleeve transition stop sleeve 14 is realized with the upper end of lower sleeve 13 by way of welding and fixed.
Vertical loading device is provided with the draft hitch, the Vertical loading device includes spiral transmissioning rod 15, spiral shell
Spin nut 16, rocking handle 17 and worm drive fixed mount 18, pass through the side of key interference between the rocking handle 17 and spiral transmissioning rod 15
Formula realizes and connected firmly that threaded nut 16 is fixed with worm drive fixed mount 18 by peripheral bolt；Spiral transmissioning rod 15 and spiral spiral shell
Mother 16 engages the displacement feeding realized in vertical direction by tooth.
The lower section of drum apparatus 4 is provided with the excitation system device for producing different excited frequencies and amplitude, described
Excitation system device includes driving source variable-frequency motor 19, shaft coupling 20 and amplitude regulating device 21, the driving source variable-frequency motor
19 are connected by embedded bolt realization with the fixing device of firm banking 1, and one end of shaft coupling 20 is realized by way of key interference
It is connected with the rotating shaft of driving source variable-frequency motor 19, the other end is realized with amplitude regulating device 21 by key interference mode and is connected.
Brake disc 22 is provided between the Electric Motor Wheel 3 and goat's horn 6, the speed of Electric Motor Wheel 3 is carried out by brake disc 22
Control.
The amplitude regulating device 21 is made up of exciting disk 23, drag link 24, vertical push rod 25 and clutch disk 26, described
Drag link 24 is arranged on lower sleeve 13, and the vertical push rod 25 is arranged on the middle part of drag link 24, and the exciting disk 23 is set
In the vertical front end of push rod 25, the clutch disk 26 is arranged on exciting disk 23, the drag link（24）Installed in lower sleeve
（13）Side opening on.
The Vertical loading device lower end is provided with damper 27, is set between the Vertical loading device and damper 27
There is pressure sensor 28.
Claims (7)
1. a kind of wheel hub drives electric automobile Electric Motor Wheel suspension system testing stand, including firm banking（1）With total frame（2）, institute
State firm banking（1）It is arranged on total frame（2）Lower end, it is characterised in that：Total frame（2）On be provided with draft hitch, electricity
Driving wheel（3）With the drum apparatus for simulated roadway（4）, the draft hitch is by upper swing arm（5）, goat's horn（6）And lower swing arm（7）
Constitute, the upper swing arm（5）One end pass through total frame（2）The hinged block of top（8）Realize connection, the other end and goat's horn（6）
It is hinged, the goat's horn（6）Lower end pass through bulb and lower swing arm（7）One end connection, lower swing arm（7）The other end and total frame
（2）On fixed block（9）Realization is hinged, the Electric Motor Wheel（3）It is arranged on goat's horn（6）Right-hand member, the drum apparatus（4）Pass through
Roller cage（10）It is arranged on Electric Motor Wheel（3）Lower section.
2. a kind of wheel hub driving electric automobile Electric Motor Wheel suspension system testing stand as claimed in claim 1, it is characterised in that：Institute
State roller cage（10）By longitudinal cylinder guide pillar（11）, upper bush（12）, lower sleeve（13）With sleeve transition stop sleeve
（14）Constitute, longitudinal cylinder guide pillar（11）Installed in the firm banking of perforate（1）On；Upper bush（12）Pass through center hole
Installed in longitudinal cylinder guide pillar（11）On, upper bush（12）Side is provided with the side opening for mounting rotary drum axle；Lower sleeve（13）It is logical
Cross center hole and be arranged on longitudinal cylinder guide pillar（11）On, lower sleeve（13）Side is provided with side opening；Sleeve transition stop sleeve
（14）Longitudinal cylinder guide pillar is arranged on by center hole（11）On, sleeve transition stop sleeve（14）The side that upper end passes through welding
Formula and upper bush（12）Lower end, which is realized, to be fixed, sleeve transition stop sleeve（14）Lower end is by way of welding and lower sleeve（13）
Upper end, which is realized, to be fixed.
3. a kind of wheel hub driving electric automobile Electric Motor Wheel suspension system testing stand as claimed in claim 1, it is characterised in that：Institute
State and Vertical loading device is provided with draft hitch, the Vertical loading device includes spiral transmissioning rod（15）, threaded nut
（16）, rocking handle（17）With worm drive fixed mount（18）, the rocking handle（17）With spiral transmissioning rod（15）Between pass through key interference
Mode realize and connect firmly, threaded nut（16）With worm drive fixed mount（18）Fixed by peripheral bolt；Spiral transmissioning rod
（15）With threaded nut（16）The displacement feeding realized in vertical direction is engaged by tooth.
4. a kind of wheel hub driving electric automobile Electric Motor Wheel suspension system testing stand as claimed in claim 1, it is characterised in that：Institute
State drum apparatus（4）Lower section is provided with the excitation system device for producing different excited frequencies and amplitude, the excitation system
Device includes driving source variable-frequency motor（19）, shaft coupling（20）And amplitude regulating device（21）, the driving source variable-frequency motor
（19）Realized and firm banking by embedded bolt（1）Fixing device is connected, shaft coupling（20）One end side for passing through key interference
Formula is realized and driving source variable-frequency motor（19）Rotating shaft is connected, and the other end passes through key interference mode and amplitude regulating device（21）Realize
Connection.
5. a kind of wheel hub driving electric automobile Electric Motor Wheel suspension system testing stand as claimed in claim 1, it is characterised in that：Institute
State Electric Motor Wheel（3）With goat's horn（6）Between be provided with brake disc（22）, pass through brake disc（22）Realize to Electric Motor Wheel（3）Speed is entered
Row control.
6. a kind of wheel hub driving electric automobile Electric Motor Wheel suspension system testing stand as claimed in claim 4, it is characterised in that：Institute
State amplitude regulating device（21）By exciting disk（23）, drag link（24）, vertical push rod（25）And clutch disk（26）Constitute, it is described
Drag link（24）It is arranged on lower sleeve（13）On, the vertical push rod（25）It is arranged on drag link（24）Middle part, exciting circle
Disk（23）It is arranged on vertical push rod（25）Front end, the clutch disk（26）It is arranged on exciting disk（23）On, the drag link
（24）Installed in lower sleeve（13）Side opening on.
7. a kind of wheel hub driving electric automobile Electric Motor Wheel suspension system testing stand as claimed in claim 3, it is characterised in that：Institute
State Vertical loading device lower end and be provided with damper（27）, the Vertical loading device and damper（27）Between be provided with pressure
Sensor（28）.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710451112.2A CN107192561B (en) | 2017-06-15 | 2017-06-15 | Test bed for electric wheel suspension system of hub-driven electric automobile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710451112.2A CN107192561B (en) | 2017-06-15 | 2017-06-15 | Test bed for electric wheel suspension system of hub-driven electric automobile |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107192561A true CN107192561A (en) | 2017-09-22 |
| CN107192561B CN107192561B (en) | 2023-04-07 |
Family
ID=59878090
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710451112.2A Active CN107192561B (en) | 2017-06-15 | 2017-06-15 | Test bed for electric wheel suspension system of hub-driven electric automobile |
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| CN (1) | CN107192561B (en) |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107957340A (en) * | 2017-12-22 | 2018-04-24 | 重庆长安汽车股份有限公司 | Automobile a quarter suspension and damper simulation working condition tests platform |
| CN108168902A (en) * | 2017-12-15 | 2018-06-15 | 湖南科技大学 | Drum-type multiple road conditions simulate electric boosting steering system testing stand |
| CN108362502A (en) * | 2018-01-03 | 2018-08-03 | 浙江大学 | Wheel hub motor drive/braking performance test and energy regenerating is multifunctional test bed and its method |
| CN108919114A (en) * | 2018-04-26 | 2018-11-30 | 江苏大学 | A kind of hub motor experimental stand device and its experimental system |
| CN109115514A (en) * | 2018-07-16 | 2019-01-01 | 江苏大学 | A kind of adjustable-angle road imitation tester and method for testing electric car |
| CN109263423A (en) * | 2018-10-25 | 2019-01-25 | 北京航天发射技术研究所 | A kind of independent suspension guiding mechanism and its test device and method |
| CN113188809A (en) * | 2021-03-31 | 2021-07-30 | 江苏兰菱机电科技有限公司 | Mecanum wheel dynamic performance detection platform |
| CN113281057A (en) * | 2021-04-30 | 2021-08-20 | 西南交通大学 | Dynamic performance test platform for electric wheel and suspension system |
| CN113593393A (en) * | 2021-07-31 | 2021-11-02 | 北京智扬北方国际教育科技有限公司 | Damping-adjustable automobile spring multipath condition simulation device |
| CN113874230A (en) * | 2019-03-29 | 2021-12-31 | 普罗蒂恩电子有限公司 | Double-fork arm suspension system for in-wheel motor |
| CN114705459A (en) * | 2022-06-01 | 2022-07-05 | 山东美晨工业集团有限公司 | Chassis suspension vibration detection device |
| CN117686240A (en) * | 2024-02-04 | 2024-03-12 | 山东科技大学 | Hub electric wheel test bed capable of simulating multi-path surface working conditions and test method |
| CN118583489A (en) * | 2024-08-07 | 2024-09-03 | 湖南工程学院 | New energy automobile reduction gear vibration noise testing arrangement |
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Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108168902A (en) * | 2017-12-15 | 2018-06-15 | 湖南科技大学 | Drum-type multiple road conditions simulate electric boosting steering system testing stand |
| CN107957340A (en) * | 2017-12-22 | 2018-04-24 | 重庆长安汽车股份有限公司 | Automobile a quarter suspension and damper simulation working condition tests platform |
| CN108362502A (en) * | 2018-01-03 | 2018-08-03 | 浙江大学 | Wheel hub motor drive/braking performance test and energy regenerating is multifunctional test bed and its method |
| CN108362502B (en) * | 2018-01-03 | 2023-09-08 | 浙江大学 | Multifunctional test stand for testing driving/braking performance of hub motor and energy recovery and method thereof |
| CN108919114A (en) * | 2018-04-26 | 2018-11-30 | 江苏大学 | A kind of hub motor experimental stand device and its experimental system |
| CN109115514A (en) * | 2018-07-16 | 2019-01-01 | 江苏大学 | A kind of adjustable-angle road imitation tester and method for testing electric car |
| CN109263423B (en) * | 2018-10-25 | 2021-12-07 | 北京航天发射技术研究所 | Independent suspension guide mechanism and test device and method thereof |
| CN109263423A (en) * | 2018-10-25 | 2019-01-25 | 北京航天发射技术研究所 | A kind of independent suspension guiding mechanism and its test device and method |
| CN113874230A (en) * | 2019-03-29 | 2021-12-31 | 普罗蒂恩电子有限公司 | Double-fork arm suspension system for in-wheel motor |
| CN113874230B (en) * | 2019-03-29 | 2024-05-24 | 普罗蒂恩电子有限公司 | Double-fork arm suspension system for in-wheel motor |
| CN113188809A (en) * | 2021-03-31 | 2021-07-30 | 江苏兰菱机电科技有限公司 | Mecanum wheel dynamic performance detection platform |
| CN113281057A (en) * | 2021-04-30 | 2021-08-20 | 西南交通大学 | Dynamic performance test platform for electric wheel and suspension system |
| CN113281057B (en) * | 2021-04-30 | 2022-02-15 | 西南交通大学 | Dynamic performance test platform for electric wheel and suspension system |
| CN113593393A (en) * | 2021-07-31 | 2021-11-02 | 北京智扬北方国际教育科技有限公司 | Damping-adjustable automobile spring multipath condition simulation device |
| CN114705459A (en) * | 2022-06-01 | 2022-07-05 | 山东美晨工业集团有限公司 | Chassis suspension vibration detection device |
| CN117686240A (en) * | 2024-02-04 | 2024-03-12 | 山东科技大学 | Hub electric wheel test bed capable of simulating multi-path surface working conditions and test method |
| CN117686240B (en) * | 2024-02-04 | 2024-04-26 | 山东科技大学 | Hub electric wheel test bed capable of simulating multi-path surface working conditions and test method |
| CN118583489A (en) * | 2024-08-07 | 2024-09-03 | 湖南工程学院 | New energy automobile reduction gear vibration noise testing arrangement |
| CN118583489B (en) * | 2024-08-07 | 2024-10-15 | 湖南工程学院 | New energy automobile reduction gear vibration noise testing arrangement |
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| CN107192561B (en) | 2023-04-07 |
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