CN104948679B - A kind of three speed automatic transmission of compound gear train power maintenance - Google Patents
A kind of three speed automatic transmission of compound gear train power maintenance Download PDFInfo
- Publication number
- CN104948679B CN104948679B CN201510228009.2A CN201510228009A CN104948679B CN 104948679 B CN104948679 B CN 104948679B CN 201510228009 A CN201510228009 A CN 201510228009A CN 104948679 B CN104948679 B CN 104948679B
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- gear
- input shaft
- clutch
- transmission case
- axle
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H3/00—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion
- F16H3/44—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion using gears having orbital motion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
- F16H57/023—Mounting or installation of gears or shafts in the gearboxes, e.g. methods or means for assembly
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/04—Smoothing ratio shift
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H2700/00—Transmission housings and mounting of transmission components therein; Cooling; Lubrication; Flexible suspensions, e.g. floating frames
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Structure Of Transmissions (AREA)
Abstract
The present invention relates to a kind of three speed automatic transmission of compound gear train power maintenance, belongs to Technology of Automatic Transmission for vehicle field.Including input shaft, two gear input shafts, jackshaft, left half axle and right axle shaft, input shaft one end is arranged in transmission case, and the other end is connected with the left end of two gear input shafts by second clutch.The right-hand member of two gear input shafts is arranged in transmission case.The two ends of jackshaft are arranged in transmission case.The right-hand member of the left end and right axle shaft of left half axle is separately mounted in transmission case, and differential mechanism is provided between left half axle and right axle shaft.This automatic transmission, using single planetary gear system and the parallel-axes gears structure of a pair often engagements, overall dimensions are less, with lightweight advantage, are easy to arrangement；Gear switching is carried out by the sliding friction of two clutches and brake, power failure-free significantly improves smooth gear shifting；Three gear speed changes are realized, the motor efficiency of electric automobile can be effectively improved.
Description
Technical field
The present invention relates to a kind of three speed automatic transmission of compound gear train power maintenance, belongs to Technology of Automatic Transmission for vehicle
Field.
Background technology
Developing rapidly for auto industry, while bringing convenience to people's lives, also brings environment and energy crisis,
Especially in China, metropolitan prevention and control of air pollution is extremely urgent, and one of primary pollution source is exactly motor vehicle emission, the electricity of automobile
Dynamicization is expected to alleviate or part solves these problems.Promulgate within 2012 for this State Council《Energy-conservation is sent out with new-energy automobile industry
Exhibition planning (2012-2020)》,《Development plan》In clearly propose, to " pure electric automobile and plug-in hybrid-power automobile
" emphasis propulsion " is wanted in industrialization ".
Due to motor speed adjusting scope it is big, and with during low speed when permanent torque, high speed invariable power characteristic, it is electronic in theory
Machine is capable of achieving stepless speed regulation without variator.Therefore, in terms of power transmission, cancel variator electric automobile more and adopt
Fixed speed ratio.But in fact, this mode drives vehicle to there are many deficiencies：One is that motor speed adjusting scope is difficult to take into account big torsion
Square and max. speed；Two is that, in the case of direct drive of wheel, electric motor operation point is often in low efficiency region, has both wasted electricity
Can, the requirement to motor is improve again, vehicle traveling economy is bad, and course continuation mileage is limited.Therefore in order to improve motor
Efficiency during operation, while reducing electric automobile for the requirement of motor and battery, it is necessary to install multi-speed additional to electric automobile
Compare variator.
The country has part electric automobile to be equipped with variator, but basic structure automatic change still for Conventional parallel shaft type at present
Fast device, often volume is larger for this variator, and there is power interruption phenomenon when shifting gears, and comfort is poor；In theory
Multi-shifting speed variators can also be constituted using two planet circular systems, but complex structure, transmission efficiency be low, requirement on machining accuracy is high；Mesh
The electric automobile gear device of front commercialization generally only arranges two gears, is respectively used to low speed starting and the high speed of electric automobile
Cruise, but when urban traffic situation is travelled, generally require to travel with medium speed, can all be made with high gear or low gear traveling merely electronic
Engine efficiency step-down.
The content of the invention
The purpose of the present invention is to propose to a kind of three speed automatic transmission of compound gear train power maintenance, designs by single row
Three speed automatic transmission of compound gear train power maintenance of the parallel-axes gears composition of star gear train and a pair often engagements, makes electricity
Electrical automobile can be travelled with three gears, improved the operational efficiency of motor, realized that the power of electric automobile does not interrupt gearshift.
Three speed automatic transmission of compound gear train power maintenance proposed by the present invention, including input shaft, two gear input shafts, in
Countershaft, left half axle and right axle shaft；One end being connected with motor of described input shaft is arranged in transmission case by bearing,
The other end of input shaft is connected with the left end of two gear input shafts by second clutch；The right-hand member of two described gear input shafts passes through
Bearing is arranged in transmission case；The two ends of described jackshaft are arranged in transmission case；The left end of described left half axle and
The right-hand member of right axle shaft is arranged in transmission case by bearing respectively, and differential mechanism, left half axle are provided between left half axle and right axle shaft
Right-hand member and right axle shaft left end by bearing be arranged on differential mechanism two ends, main reducing gear driven tooth is set with differential mechanism
Wheel；It is sequentially installed with high to low gear driving gear, planetary gear system and second clutch, institute on described input shaft from left to right
The planetary gear system stated is made up of sun gear, planet carrier, planetary gear and gear ring, and described sun gear is connected with input shaft,
Described planet carrier is sleeved on input shaft, and described planetary gear has multiple, and multiple planetary gears are distributed in around sun gear,
Planet carrier is connected with planetary gear, and gear ring is arranged on the end of described first clutch, planetary gear and sun gear external toothing,
Simultaneously planetary gear and gear ring internal messing, one end of described first clutch are relatively fixed with input shaft, first clutch
The other end is relatively fixed with the gear ring of planetary gear system, and the gear ring of planetary gear system and one are arranged in transmission case
The rotating part of brake is relatively fixed, and the planet carrier being sleeved on input shaft is connected with described high to low gear driving gear；Institute
Two gear driving gear is installed on the two gear input shafts stated；It is sequentially installed with high to low gear on described jackshaft from left to right driven
Height on gear, main reducing gear driving gear and two gear driven gears, described high to low gear driven gear and described input shaft
Low gear driving gear is meshed, the main reducing gear driven tooth being set with described main reducing gear driving gear and described differential mechanism
Wheel is meshed, and two described gear driven gears are meshed with the two gear driving gear installed on two described gear input shafts.
Three speed automatic transmission of compound gear train power maintenance proposed by the present invention, its advantage is, this three gear automatic speed changing
The parallel-axes gears structure of single planetary gear system and a pair often engagements is adopted in device, the overall dimensions of variator is made than existing
Parallel-axis type speed variator and two-row planetary gear formula variator it is little, therefore have lightweight advantage, be easy to arrangement；This
Gear switching is carried out by the sliding friction of two clutches and brake in three speed automatic transmissions, power failure-free, thus
The smooth gear shifting during car steering can be significantly improved；Three gear speed changes are realized in this three speed automatic transmission, than existing
Two shift transmissions be more suitable for urban traffic situation, the motor efficiency of electric automobile can be effectively improved.
Description of the drawings
Fig. 1 is the structural representation of three speed automatic transmission of compound gear train power maintenance proposed by the present invention.
Fig. 2 is power transmission line of the automatic transmission of the present invention in a gear.
Fig. 3 is power transmission line of the automatic transmission of the present invention in two gears.
Fig. 4 is power transmission line of the automatic transmission of the present invention in three gears.
In Fig. 1-Fig. 4,1 is input shaft, and 2 is high to low gear driving gear, and 3 is planet carrier, and 4 is brake, and 5 is gear ring, 6
It is first clutch, 7 is transmission case, and 8 is second clutch, and 9 is two gear driving gear, and 10 is two gear input shafts, and 11 is too
Sun wheel, 12 is planetary gear, and 13 is two gear driven gears, and 14 is jackshaft, and 15 is main reducing gear driving gear, and 16 is right half
Axle, 17 is bearing, and 18 is main reducing gear driven gear, and 19 is differential mechanism, and 20 is left half axle, and 21 is high to low gear driven gear, and M is
Motor.
Specific embodiment
Three speed automatic transmission of compound gear train power maintenance proposed by the present invention, its structure is as shown in figure 1, including input
The gear input shaft 10 of axle 1, two, jackshaft 14, left half axle 20 and right axle shaft 16.One end being connected with motor M of input shaft 1 is passed through
Bearing 17 is arranged in transmission case 7, and the other end of input shaft 1 is by second clutch 8 and the two left end phases for keeping off input shafts 10
Even.The right-hand member of two gear input shafts 10 is arranged in transmission case 7 by bearing 17.The two ends of jackshaft 14 are arranged on transmission case
On 7.The right-hand member of the left end and right axle shaft 16 of left half axle 20 is arranged in transmission case 7 by bearing 17 respectively, 20 He of left half axle
Differential mechanism 19 is provided between right axle shaft 16, the left end of the right-hand member and right axle shaft 16 of left half axle 20 is arranged on differential mechanism by bearing 17
19 two ends, are set with main reducing gear driven gear 18 on differential mechanism 19.It is sequentially installed with high to low gear on input shaft 1 from left to right
Driving gear 2, planetary gear system and second clutch 8.Planetary gear system is by sun gear 11, planet carrier 3, planetary gear 12
Constitute with gear ring 5, sun gear 11 is connected with input shaft 1, and planet carrier 3 is sleeved on input shaft 1, and planetary gear 12 has multiple, many
Individual planetary gear 12 is distributed in around sun gear 11, and planet carrier 3 is connected with planetary gear 12, and gear ring 5 is arranged on first clutch 6
End, planetary gear 12 and 11 external toothing of sun gear, while planetary gear 12 and 5 internal messing of gear ring, the one of first clutch 6
End is relatively fixed with input shaft 1, and the other end of first clutch 6 is relatively fixed with the gear ring 5 of planetary gear system, planetary gear
The gear ring 5 of system is relatively fixed with the rotating part of a brake 4 being arranged in transmission case 7, is sleeved on input shaft 1
Planet carrier 3 be connected with high to low gear driving gear 2.Two gear driving gear 9 is installed on two gear input shafts 10.On jackshaft 14 from
Left-to-right is sequentially installed with high to low gear driven gear 21, main reducing gear driving gear 15 and two gear driven gears 13, high to low gear from
Moving gear 21 is meshed with the high to low gear driving gear 2 on input shaft 1, is set with main reducing gear driving gear 15 and differential mechanism 19
Main reducing gear driven gear 18 be meshed, two gear driven gears 13 keep off the two gear driving gear 9 installed on input shafts 10 with two
It is meshed.
Three speed automatic transmission of compound gear train power maintenance of the present invention, when first clutch therein 6 is engaged, makes defeated
The gear ring 5 for entering axle 1 and planetary gear system is interconnected；When second clutch 8 is engaged, interconnect input shaft 1 and two gear input shafts 10；
When brake 4 is engaged, the gear ring 5 and transmission case 7 for making planetary gear system is interconnected.
First clutch therein 6 can adopt electromagnetic clutch or mechanical clutch.
Second clutch therein 8 can adopt electromagnetic clutch or mechanical clutch.
Brake therein 4 can adopt electromagnetic brake or mechanical brake.
Below in conjunction with accompanying drawing, the work of three speed automatic transmission of compound gear train power maintenance proposed by the present invention is described in detail
Make principle and the course of work：
Fig. 2 show power transmission line when described variator one keeps off, and the one of automatic transmission keeps off for automobile
Walk, climb, run at a low speed and move backward.When variator is located at a gear, first clutch 6, second clutch 8 disconnect, brake 4
Engagement, so that transmission case 7 is interconnected with the gear ring 5 of planetary gear system, the power of motor M is delivered to row through input shaft 1
The sun gear 11 of star gear train, now as gear ring 5 is fixed in transmission case 7, the sun gear 11 of planetary gear system
A speed ratio more than 1 is produced by planetary gear 12 between planet carrier 3, power is transmitted through planetary gear 12, planet carrier 3
To high to low gear driving gear 2, then by high to low gear driven gear 21, jackshaft 14, main reducing gear driving gear 15, main reducing gear
Driven gear 18, differential mechanism 19 are delivered to left half axle 20, right axle shaft 16, so as to driving moment.
Fig. 3 show power transmission line when automatic transmission two is kept off, and the two of automatic transmission keeps off for automobile middling speed
Traveling.Variator positioned at two gears when, brake 4, first clutch 6 disconnect, and second clutch 8 is engaged so that input shaft 1 with
Two gear input shafts 10 are interconnected, and the power of motor M is delivered to two gear input shafts 10 through input shaft 1, then by two gear driving tooths
Wheel 9, two keeps off driven gear 13, jackshaft 14, main reducing gear driving gear 15, main reducing gear driven gear 18, differential mechanism 19 and passes
Left half axle 20, right axle shaft 16 are delivered to, so as to driving moment.In the process, by two gear driving gear 9 and two gear driven gears
13 engagement, can produce one more than 1 but less than the speed ratio of a gear, form two and keep off.
Fig. 4 show power transmission line when automatic transmission three is kept off, and the three of automatic transmission keeps off for automobile high-speed
Traveling, alternatively referred to as direct gear.When variator is located at three gears, brake 4, second clutch 8 disconnect, and first clutch 6 connects
Close, so that input shaft 1 is interconnected with the gear ring 5 of planetary gear system, the power of motor M is delivered to planet tooth through input shaft 1
The sun gear 11 and gear ring 5 of wheel system, now as gear ring 5 is interconnected with sun gear 11, therefore planetary gear system is whole with one
Body synchronous rotary, the speed between the sun gear 11 and planet carrier 3 of planetary gear system compare for 1, and power is transferred to through planet carrier 3
High to low gear driving gear 2, then by high to low gear driven gear 21, jackshaft 14, main reducing gear driving gear 15, main reducing gear from
Moving gear 18, differential mechanism 19 are delivered to left half axle 20, right axle shaft 16, so as to driving moment.
When first clutch 6, second clutch 8, brake 4 are all off, variator is in neutral, can meet electronic
The needs that automobile is towed or keeped in repair.
Variator is kept off from one when switching to two gears, and brake 4 is gradually turned off, while second clutch 8 is gradually engaged, first
Clutch 6 is remained off, so that gear ring 5 is gradually disconnected with transmission case 7, input shaft 1 is gradually mutual with two gear input shafts 10
Even, when input shaft 1 and two gear input shafts 10 are interconnected completely, complete the switching from a gear to two gears.
Variator is kept off from two when switching to a gear, and second clutch 8 is gradually turned off, while brake 4 is gradually engaged, first
Clutch 6 is remained off, so that input shaft 1 is gradually disconnected with two gear input shafts 10, gear ring 5 is gradually mutual with transmission case 7
Even, when gear ring 5 is interconnected completely with transmission case 7, complete the switching from two gears to a gear.
Variator is kept off from two when switching to three gears, and second clutch 8 is gradually turned off, while first clutch 6 is gradually engaged,
Brake 4 is remained off, so that input shaft 1 is gradually disconnected with two gear input shafts 10, and is gradually interconnected with gear ring 5, is worked as tooth
When circle 5 is interconnected completely with input shaft 1, the switching from two gears to three gears is completed.
Variator is kept off from three when switching to two gears, and first clutch 6 is gradually turned off, while second clutch 8 is gradually engaged,
Brake 4 is remained off, so that input shaft 1 is gradually disconnected with gear ring 5, and is gradually interconnected with two gear input shafts 10, when defeated
Enter axle 1 and when two gear input shafts 10 are interconnected completely, complete the switchings from three gears to two gears.
Variator is kept off from one when switching to three gears, and brake 4 is gradually turned off, while first clutch 6 is gradually engaged, second
Clutch 8 is remained off, so that gear ring 5 is gradually disconnected with transmission case 7, and is gradually interconnected with input shaft 1, when gear ring 5
When interconnected with input shaft 1 completely, the switching from a gear to three gears is completed.
Variator is kept off from three when switching to a gear, and first clutch 6 is gradually turned off, while brake 4 is gradually engaged, second
Clutch 8 is remained off, so that gear ring 5 is gradually disconnected with input shaft 1, and is gradually interconnected with transmission case 7, when gear ring 5
When interconnected with transmission case 7 completely, the switching from three gears to a gear is completed.
Claims (1)
1. a kind of three speed automatic transmission of compound gear train power maintenance, it is characterised in that three speed automatic transmission includes input
Axle, two gear input shafts, jackshaft, left half axle and right axle shaft；One end being connected with motor of described input shaft passes through bearing
In transmission case, the other end of input shaft is connected with the left end of two gear input shafts by second clutch；Described two
The right-hand member of gear input shaft is arranged in transmission case by bearing；The two ends of described jackshaft are arranged in transmission case；Institute
The right-hand member of the left end and right axle shaft of the left half axle stated is arranged in transmission case, between left half axle and right axle shaft by bearing respectively
Differential mechanism is provided with, the left end of the right-hand member and right axle shaft of left half axle is arranged on the two ends of differential mechanism by bearing, is set with differential mechanism
There is main reducing gear driven gear；It is sequentially installed with high to low gear driving gear, epicyclic train on described input shaft from left to right
System and second clutch, described planetary gear system is made up of sun gear, planet carrier, planetary gear and gear ring, it is described too
Sun wheel is connected with input shaft, and described planet carrier is sleeved on input shaft, and described planetary gear has multiple, multiple planetary gears
Be distributed in around sun gear, planet carrier and planetary gear are connected, gear ring is arranged on the end of first clutch, planetary gear with too
Sun wheel external toothing, while planetary gear and gear ring internal messing, one end of described first clutch is relatively fixed with input shaft, the
The other end of one clutch is relatively fixed with the gear ring of planetary gear system, and the gear ring of planetary gear system and one are arranged on and become
The rotating part of the brake on fast device shell is relatively fixed, the planet carrier being sleeved on input shaft and described high to low gear driving tooth
Wheel is connected；Two gear driving gear is installed on two described gear input shafts；It is sequentially installed with described jackshaft from left to right
High to low gear driven gear, main reducing gear driving gear and two gear driven gears, described high to low gear driven gear are defeated with described
The high to low gear driving gear entered on axle is meshed, and the master being set with described main reducing gear driving gear and described differential mechanism subtracts
Fast device driven gear is meshed, and two described gear driven gears keep off the two gear driving gear phase installed on input shafts with described two
Engagement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510228009.2A CN104948679B (en) | 2015-05-07 | 2015-05-07 | A kind of three speed automatic transmission of compound gear train power maintenance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510228009.2A CN104948679B (en) | 2015-05-07 | 2015-05-07 | A kind of three speed automatic transmission of compound gear train power maintenance |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104948679A CN104948679A (en) | 2015-09-30 |
| CN104948679B true CN104948679B (en) | 2017-04-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510228009.2A Expired - Fee Related CN104948679B (en) | 2015-05-07 | 2015-05-07 | A kind of three speed automatic transmission of compound gear train power maintenance |
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| Country | Link |
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| CN (1) | CN104948679B (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105299169A (en) * | 2015-12-09 | 2016-02-03 | 重庆先友科技开发有限公司 | Three-level variable speed main reducer assembly for electric vehicle |
| CN105485262A (en) * | 2016-01-22 | 2016-04-13 | 吉林大学 | Two-gear transmission for electric vehicle |
| CN106499779B (en) * | 2016-11-04 | 2019-03-01 | 浙江大众齿轮有限公司 | A kind of Multilayer-tooth geared automated gearbox based on centrifugal force |
| CN106523606B (en) * | 2016-11-04 | 2019-03-15 | 浙江大众齿轮有限公司 | A kind of Multilayer-tooth geared automated gearbox based on scroll spring |
| CN106926693A (en) * | 2017-04-14 | 2017-07-07 | 南京越博动力系统股份有限公司 | A kind of pure electric vehicle integrated dynamic assembly |
| CN109018178A (en) * | 2017-06-11 | 2018-12-18 | 枣庄宝武机电科技开发有限公司 | Bicycle three keeps off automatic internal speed variator of real |
| CN107139717A (en) * | 2017-06-27 | 2017-09-08 | 南京越博动力系统股份有限公司 | Electric car two keeps off transaxle and its driving method |
| CN109578534B (en) * | 2017-09-29 | 2020-10-23 | 比亚迪股份有限公司 | Three-gear transmission and three-gear electric assembly |
| CN109578532B (en) * | 2017-09-29 | 2020-11-06 | 比亚迪股份有限公司 | Three-gear transmission and three-gear electric assembly |
| CN109578533B (en) * | 2017-09-29 | 2022-03-15 | 比亚迪股份有限公司 | Three-gear electric assembly and speed ratio determination method thereof |
| CN107725700B (en) * | 2017-10-20 | 2024-03-22 | 宁波彰星智能科技有限公司 | Internal three-speed double-clutch transmission |
| CN108189665A (en) * | 2018-02-11 | 2018-06-22 | 浙江华亦海汽车电子科技有限公司 | A kind of drive system of electric automobile configuration |
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| CN203082135U (en) * | 2013-01-23 | 2013-07-24 | 清华大学 | Power-keeping-type mechanical car second-gear automatic speed changer |
| CN103291859A (en) * | 2013-01-16 | 2013-09-11 | 清华大学 | Automatic power-preserving mechanical three-gear transmission of automobile |
| CN203926675U (en) * | 2014-06-11 | 2014-11-05 | 杭州前进齿轮箱集团股份有限公司 | A kind of planet difference speed reducer used for electric vehicle |
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2015
- 2015-05-07 CN CN201510228009.2A patent/CN104948679B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103291859A (en) * | 2013-01-16 | 2013-09-11 | 清华大学 | Automatic power-preserving mechanical three-gear transmission of automobile |
| CN203082135U (en) * | 2013-01-23 | 2013-07-24 | 清华大学 | Power-keeping-type mechanical car second-gear automatic speed changer |
| CN203926675U (en) * | 2014-06-11 | 2014-11-05 | 杭州前进齿轮箱集团股份有限公司 | A kind of planet difference speed reducer used for electric vehicle |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104948679A (en) | 2015-09-30 |
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Granted publication date: 20170405 |