CN107477098A - Spline pair dynamic engagement device - Google Patents
Spline pair dynamic engagement device Download PDFInfo
- Publication number
- CN107477098A CN107477098A CN201710884301.9A CN201710884301A CN107477098A CN 107477098 A CN107477098 A CN 107477098A CN 201710884301 A CN201710884301 A CN 201710884301A CN 107477098 A CN107477098 A CN 107477098A
- Authority
- CN
- China
- Prior art keywords
- sleeve
- spline
- mesh sleeve
- mesh
- engagement device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D3/00—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
- F16D3/02—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive adapted to specific functions
- F16D3/06—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive adapted to specific functions specially adapted to allow axial displacement
-
- 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
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D23/00—Details of mechanically-actuated clutches not specific for one distinct type
- F16D23/02—Arrangements for synchronisation, also for power-operated clutches
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mechanical Operated Clutches (AREA)
Abstract
The invention discloses a kind of spline pair dynamic engagement device, including compensating component, compensation component includes intermediate sleeve and mesh sleeve, the outside of the intermediate sleeve and output axis connection of engine, inner side and mesh sleeve outer helical formula are rotatablely connected, it is connected on the inside of mesh sleeve with the input shaft loaded by spline, in addition to is arranged at the stop nut of the first end of intermediate sleeve and mesh sleeve vertically and is arranged at the second end vertically of mesh sleeve and the elastic component for providing mesh sleeve the pretightning force towards first end；When differential seat angle be present between compensating the second spline tooth on the first spline tooth and input shaft of the driven power of component towards first end on the inside of mobile and mesh sleeve, mesh sleeve is offset under the thrust of the second spline tooth towards the second end, and predetermined angle is rotated so that the first spline tooth and the second spline tooth engage between intermediate sleeve, the pretightning force promotion mesh sleeve of elastic component moves to towards first end is close to stop nut.
Description
Technical field
The present invention relates to engaging mechanism field, especially, is related to a kind of spline pair dynamic engagement device.
Background technology
Certain novel power device need to use multi-disc friction clutch connection load and engine, under engine operating status
The break-make of load power is realized by the engagement and disengagement that control multiplate clutch.Because engine output end rotating speed is higher, work(
Rate is big, and multiplate clutch directly engages that will to cause that friction plate caloric value is excessive, temperature is too high, clutch is oversized etc. a series of
Problem.Feasible scheme is：By actively reducing engine speed first, load and engine are then realized by multiplate clutch
Rotating speed matches (small-power state), then a pair of spline pairs in clutch are engaged, and changing power transfer path, (power is by the spline
Pair is transmitted, and no longer passes through friction plate), engine speed and power are subsequently improved again.
The scheme of the function can be achieved at present a lock ring type inertia synchronizer in automobile gearbox, and this synchronizer is usual
Including synchronous ring (lock ring), splined hub, clutch collar and the gear ring being coaxially disposed, synchronous anchor ring has locking to one end of clutch collar
Angle, and it is identical with clutch collar angle of lock.Prior art crosses synchronous ring by setting angle of lock in mesh splines, in clutch collar
Afterwards, a rotating torque is produced by the steering force of driver, gear of the empty set on axle is produced angular turn, realize spline
The engagement of tooth.The technology is on automotive transmission with extensive, technology maturation.Due to multiplate clutch engage after (input shaft and
Output shaft synchronous) need to carry high torque, angular position is locked by friction plate axial compressive force between input shaft and output shaft
Firmly, as used the locking corner structure in synchronizer, then very big axial steering force and rotating torque is needed, easily causes locking surface
Larger or Fast Wearing is deformed, therefore synchronizer locking corner structure is not suitable in multiplate clutch structure.
The content of the invention
The invention provides a kind of spline pair dynamic engagement device, is needed very with solving existing synchronizer locking corner structure
Big axial steering force and rotating torque causes locking facial disfigurement larger or the technical problem of Fast Wearing.
The technical solution adopted by the present invention is as follows：
One aspect of the present invention provides a kind of spline pair dynamic engagement device, for connecting engine and load, spline pair
Dynamic engagement device includes compensation component, and compensation component includes intermediate sleeve and the mesh sleeve in intermediate sleeve, middle
The outside of sleeve is used for the output axis connection with engine, and the inner side of intermediate sleeve and the outside of mesh sleeve are helical action
Connection, the inner side of mesh sleeve are connected with the input shaft of load by spline, compensation component also including be arranged at intermediate sleeve with
And the first end of mesh sleeve vertically stop nut and be arranged at mesh sleeve the second end vertically and for pair
Mesh sleeve provides the elastic component of the pretightning force towards first end；When the compensation driven power of component is mobile towards first end and nibbles
When differential seat angle be present between the second spline tooth on the first spline tooth and input shaft on the inside of trap cylinder, mesh sleeve is in the second flower
Offset under the thrust of key teeth towards the second end, and predetermined angle is rotated so that the first spline tooth and second between intermediate sleeve
Spline tooth engages, and the pretightning force promotion mesh sleeve of elastic component moves to towards first end is close to stop nut.
As preferred embodiment therein, the inner side of intermediate sleeve and the outside of mesh sleeve are connected by the secondary rotation of helical spline
Connect.
As another optional embodiment, the inner side of intermediate sleeve and the outside of mesh sleeve pass through mutual cooperation
Helical groove is rotatably connected with spiral projection.
Further, the outside of intermediate sleeve is provided with the 3rd spline tooth for being used for engaging with the spline tooth on output shaft, in
The side of 3rd spline tooth is provided with positioning section, and positioning section coordinates with the spline tooth top on output shaft.
Further, elastic component is wavy spring, the both ends of wavy spring be connected to respectively mesh sleeve outer end and
The inner end of intermediate sleeve.
Further, spring support seat is also equiped with the outer end of mesh sleeve, bullet is fixed in one end of wavy spring
In first fixing groove of spring support seating face, the other end is fixed in the second fixing groove of the inner end of intermediate sleeve.
Further, stop nut is sheathed on outside mesh sleeve and in intermediate sleeve, and the end face of stop nut is resisted
In the first end of intermediate sleeve and the connecting portion of mesh sleeve.
Further, spline pair dynamic engagement device also includes being used for the driving machine for driving compensation component to be axially moveable
Structure.
Further, spline pair dynamic engagement device also includes being arranged to support between compensation component and drive mechanism being driven
Mechanism.
Alternatively, transmission mechanism is supported to include the ball bearing being installed on the outside of intermediate sleeve and the axle being arranged at outside ball bearing
Bearing.
The present invention is connected by will be arranged to screw type rotary on the outside of the inner side of intermediate sleeve and mesh sleeve, by nibbling
Predetermined angle is rotated between trap cylinder and intermediate sleeve to compensate the angular error between the first spline tooth and the second spline tooth, is protected
Demonstrate,proving the first spline tooth and the second spline tooth can quickly and reliably engage, simple in construction, and reliability is high, effectively substitutes existing skill
Synchronizer in art.
In addition to objects, features and advantages described above, the present invention also has other objects, features and advantages.
Below with reference to accompanying drawings, the present invention is further detailed explanation.
Brief description of the drawings
The accompanying drawing for forming the part of the application is used for providing a further understanding of the present invention, schematic reality of the invention
Apply example and its illustrate to be used to explain the present invention, do not form inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 is that the spline pair dynamic engagement device of the preferred embodiment of the present invention is assemblied in the signal between engine and load
Figure；
Fig. 2 is the structural representation of the second spline tooth on the input shaft of the preferred embodiment of the present invention.
Drawing reference numeral explanation：
1st, output shaft；2nd, input shaft；20th, the second spline tooth；201st, chamfering；3rd, intermediate sleeve；30th, the 3rd spline tooth；31、
Positioning section；32nd, the second fixing groove；4th, mesh sleeve；40th, the first spline tooth；5th, stop nut；6th, elastic component；7th, spring supporting
Seat；70th, the first fixing groove；8th, transmission mechanism is supported；80th, ball bearing；81st, bearing block；9th, drive mechanism；A, helical spline pair.
Embodiment
It should be noted that in the case where not conflicting, the feature in embodiment and embodiment in the application can phase
Mutually combination.Describe the present invention in detail below with reference to the accompanying drawings and in conjunction with the embodiments.
Reference picture 1, the preferred embodiments of the present invention provide a kind of spline pair dynamic engagement device, for connecting engine
With load.Specifically, spline pair dynamic engagement device is connected between the output shaft 1 of engine and the input shaft 2 of load.Spline
Secondary dynamic engagement device includes being connected to compensation component between output shaft 1 and input shaft 2, is arranged at the branch for compensating component side
Support transmission mechanism 8 and the drive mechanism for driving support transmission mechanism 8 and then driving compensation component in axial direction to move
9.Compensation component is connected with output shaft 1 by floating spline structure, compensates the side of component by supporting transmission mechanism 8 to support.
It is worth noting that, the spline pair dynamic engagement device of the present invention is coaxial mounted symmetrical structure, for convenience of describing and marking,
The half of symmetrical structure is only illustrated in Fig. 1.
Specifically, compensation component includes：Intermediate sleeve 3, mesh sleeve 4, stop nut 5 and elastic component 6.
The outside of intermediate sleeve 3 is connected by floating spline structure with output shaft 1, the inner side of intermediate sleeve 3 and engaging sleeve
The outside of cylinder 4 connects for screw type rotary.The inner side of mesh sleeve 4 is connected with input shaft 2 by spline.Stop nut 5 is set
In the first end (i.e. left end in Fig. 1) of intermediate sleeve 3 and mesh sleeve 4 vertically.Elastic component 6 is arranged at mesh sleeve 4
The second end (i.e. right-hand member in Fig. 1) vertically, for providing mesh sleeve 4 pretightning force and reset force towards first end.
When having drive force intermediate sleeve 3 and mesh sleeve 4 mobile towards left end and the first spline tooth 40 of the inner side of mesh sleeve 4
When differential seat angle be present between the second spline tooth 20 on input shaft 2, mesh sleeve 4 is under the thrust of the second spline tooth 20
Offset towards right-hand member, and predetermined angle is rotated so that the first spline tooth 40 and the second spline tooth 20 engage between intermediate sleeve 3, bullet
Property part 6 pretightning force promote mesh sleeve 4 move to initial position towards left end.
In this preferred embodiment, the inner side of intermediate sleeve 3 is rotated with the outside of mesh sleeve 4 by helical spline secondary A to be connected
Connect.
In other embodiments, the inner side of intermediate sleeve 3 and the outside of mesh sleeve 4 can also pass through the spiral shell of mutual cooperation
Rotation groove is rotatably connected with spiral projection, is rotated against as long as can be realized between mesh sleeve 4 and intermediate sleeve 3.
Specifically, the outside of intermediate sleeve 3 is provided with the 3rd spline tooth 30 for being used for engaging with the spline tooth on output shaft 1.
In this preferred embodiment, the 3rd spline tooth 30 in the outside of intermediate sleeve 3 is involute spline, and bearing capacity is strong, easy self-centering.
Be provided with positioning section 31 in the left side of the 3rd spline tooth 30, positioning section 31 coordinates with the spline tooth top on output shaft 1, play support and
The effect of centering.
In this preferred embodiment, elastic component 6 is wavy spring, and the both ends of wavy spring are connected to mesh sleeve 4 respectively
Outer end and the inner end of intermediate sleeve 3.Use small volume but the big wavy spring of positive force can using the confined space for
Mesh sleeve 4 provides larger axial precompression.Certainly, in other embodiments, cylindrical spring or other can also be used
The elastic-like structure of axial precompression can be provided.
Further, spring support seat 7 is also equiped with the outer end of mesh sleeve 4, one end of wavy spring is fixed on
In first fixing groove 70 on the surface of spring support seat 7, the other end is fixed on the second fixing groove 32 of the inner end of intermediate sleeve 3
It is interior.Using the structure of spring support seat 7 so that wavy spring be fixed on more solid and reliablely mesh sleeve 4 and intermediate sleeve 3 it
Between, ensure that it can normally provide axial precompression and reset strength.
Further, stop nut 5 is sheathed on outside mesh sleeve 4 and in intermediate sleeve 3, the end face of stop nut 5
Resist the left end of the connecting portion in intermediate sleeve 3 Yu mesh sleeve 4.Stop nut 5 is used for intermediate sleeve 3 and mesh sleeve
4 realize axial limiting.Specifically, in the present embodiment, the right side of stop nut 5 is connected to intermediate sleeve 3 and mesh sleeve 4
The left end of helical spline secondary A spline tooth.
In the present invention, being arranged at the support transmission mechanism 8 of compensation component side includes ball bearing 80 and is arranged at ball bearing
Bearing block 81 outside 80.Specifically, ball bearing 80 is installed in the end outside of keeping right of intermediate sleeve 3, and bearing block 81 is arranged at ball axle
Hold outside 80.The compensation component thrust of axial direction passed in rotating is realized by ball bearing 80, supports and is driven and be more reliable.
Drive mechanism 9 is used to drive support transmission mechanism 8 in axial direction to move, so as to drive compensation component to move vertically
It is dynamic.In this preferred embodiment, drive mechanism 9 includes the pressurized strut being connected with control system, and pressurized strut directly acts on bearing block
81。
Further, the first flower for guiding the inner side of mesh sleeve 4 is provided with the second spline tooth 20 on input shaft 2
The chamfering 201 that key teeth 40 is engaged with.The first spline tooth 40 and the nothing of the second spline tooth 20 of need engagement in this preferred embodiment
Self-locking angle, only the tooth top chamfering 201 in the second spline tooth 20 that need to be engaged need to be set, to compensate the radially installed between splined shaft
Error.Specifically, as in Fig. 2, the tooth top of the second spline tooth 20 sets chamfering 201 in right side, and angle is about 5 °.
Reference picture 1, when compensation component of the invention is assembled between output shaft 1 and input shaft 2, give wavy spring one axle
To pre compressed magnitude, the left side of mesh sleeve 4 is set to compress stop nut 5.The axial direction that the axial pre compressed magnitude of wavy spring is formed
Power need to ensure that mesh sleeve 4 overcomes the frictional force between helical spline, to ensure that the left side of mesh sleeve 4 can compress really
Stop nut 5.
Its specific engagement of the spline pair dynamic engagement device of the present invention is as follows with exiting the start process engaged：
The output shaft 1 of engine is connected with load input shaft 2.After engine speed reduces, multiplate clutch engagement makes
Input shaft 2 reaches consistent with the rotating speed of output shaft 1.Due to compensation component by spline connect output shaft 1, therefore compensate component with
The rotating speed of input shaft 2 is consistent.Now control system gives pressurized strut one instruction, and pressurized strut promotes bearing block 81 to be driven to left movement
Dynamic compensation component is moved to the left (movement of floating spline).The outside of the inner side of mesh sleeve 4 and input shaft 2 is the flower that need to be engaged
Key, when compensation component is moved to the left, if differential seat angle be present between the first spline tooth 40 and the second spline tooth 20, both occur
Collision, gives the power of mesh sleeve 4 to the right.With the increase of start barrel stroke, power to the right increases therewith, as more than wavy spring
Frictional resistance between pretightning force and helical spline, the helical spline of mesh sleeve 4 will rotate an angle automatically, automatic to mend
Repay the angular error of spline.After first spline tooth 40 engages with the second spline tooth 20, the resistance of mesh sleeve 4 disappears, and it is in ripple
Rigging position is returned in the presence of shape initial tension of spring, i.e. mesh sleeve 4 returns to its left side and compresses stop nut 5 to the left relatively
Position.
When needing the spline pair between mesh sleeve 4 and input shaft 2 to depart from, control system gives pressurized strut one instruction,
Pressurized strut promotes bearing block 81 to move right, and is integrally extracted by ball bearing 80 by component is compensated, the first spline tooth 40 and second
Spline tooth 20 exits engagement.
The present invention is connected by the screw type rotary between intermediate sleeve 3 and mesh sleeve 4 so that the inner side of mesh sleeve 4
The first spline tooth 40 and second spline tooth 20 in the outside of input shaft 2 run at high speed at the same time under (geo-stationary) state, when two
Person occurs in the case of contradicting (angular error), is rotated to an angle and can compensated automatically with respect to intermediate sleeve 3 using mesh sleeve 4
Random angles error between first spline tooth 40 and the second spline tooth 20, makes this that spline is quickly and reliably engaged and exited
Engagement, it is simple in construction, reliability is high.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.Within the spirit and principles of the invention, that is made any repaiies
Change, equivalent substitution, improvement etc., should be included in the scope of the protection.
Claims (10)
1. a kind of spline pair dynamic engagement device, for connecting engine and load, it is characterised in that the spline pair dynamic is nibbled
Attach together and put including compensating component,
The compensation component includes intermediate sleeve (3) and the mesh sleeve (4) in the intermediate sleeve (3), the centre
The outside of sleeve (3) is used to be connected with the output shaft (1) of engine, inner side and the mesh sleeve of the intermediate sleeve (3)
(4) outside is connected for screw type rotary, and the inner side of the mesh sleeve (4) is connected with the input shaft (2) loaded by spline,
The compensation component also includes the limit for being arranged at the first end of the intermediate sleeve (3) and the mesh sleeve (4) vertically
Position nut (5) and it is arranged at the second end vertically of the mesh sleeve (4) and for being carried to the mesh sleeve (4)
For the elastic component (6) of the pretightning force towards the first end；
When the driven power of component that compensates is towards the first spline on the inside of first end movement and the mesh sleeve (4)
When differential seat angle be present between the second spline tooth (20) on tooth (40) and the input shaft (2), the mesh sleeve (4) is described
Offset under the thrust of second spline tooth (20) towards second end, and preset angle is rotated between the intermediate sleeve (3)
Spend so that first spline tooth (40) and second spline tooth (20) engagement, the pretightning force of the elastic component (6) promote institute
State mesh sleeve (4) and moved to towards the first end and be close to the stop nut (5).
2. spline pair dynamic engagement device according to claim 1, it is characterised in that the inner side of the intermediate sleeve (3)
It is rotatably connected with the outside of the mesh sleeve (4) by helical spline secondary (A).
3. spline pair dynamic engagement device according to claim 1, it is characterised in that the inner side of the intermediate sleeve (3)
It is rotatably connected with the outside of the mesh sleeve (4) by the helical groove of mutual cooperation with spiral projection.
4. spline pair dynamic engagement device according to claim 1, it is characterised in that the outside of the intermediate sleeve (3)
Provided with the 3rd spline tooth (30) for being engaged with the spline tooth on the output shaft (1), in the 3rd spline tooth (30)
Side is provided with positioning section (31), and the positioning section (31) coordinates with the spline tooth top on the output shaft (1).
5. spline pair dynamic engagement device according to claim 1, it is characterised in that the elastic component (6) is waveform bullet
Spring, the both ends of the wavy spring are connected to the outer end of the mesh sleeve (4) and the inner of the intermediate sleeve (3) respectively
Portion.
6. spline pair dynamic engagement device according to claim 5, it is characterised in that in the outer end of mesh sleeve (4)
Spring support seat (7) is also equiped with, first fixation on the spring support seat (7) surface is fixed in one end of the wavy spring
In groove (70), the other end is fixed in the second fixing groove (32) of the inner end of the intermediate sleeve (3).
7. spline pair dynamic engagement device according to claim 1, it is characterised in that the stop nut (5) is sheathed on
The mesh sleeve (4) outside and in the intermediate sleeve (3), resist in the centre by the end face of the stop nut (5)
The first end of sleeve (3) and the connecting portion of the mesh sleeve (4).
8. spline pair dynamic engagement device according to claim 1, it is characterised in that the spline pair dynamic engagement device
Also include being used for the drive mechanism (9) for driving the compensation component to be axially moveable.
9. spline pair dynamic engagement device according to claim 8, it is characterised in that the spline pair dynamic engagement device
Also include the support transmission mechanism (8) being arranged between the compensation component and the drive mechanism (9).
10. spline pair dynamic engagement device according to claim 9, it is characterised in that support transmission mechanism (8) bag
Include the ball bearing (80) being installed on the outside of the intermediate sleeve (3) and be arranged at the bearing block (81) of ball bearing (80) outside.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710884301.9A CN107477098B (en) | 2017-09-26 | 2017-09-26 | Spline pair dynamic engagement device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710884301.9A CN107477098B (en) | 2017-09-26 | 2017-09-26 | Spline pair dynamic engagement device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107477098A true CN107477098A (en) | 2017-12-15 |
| CN107477098B CN107477098B (en) | 2019-07-26 |
Family
ID=60586200
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710884301.9A Active CN107477098B (en) | 2017-09-26 | 2017-09-26 | Spline pair dynamic engagement device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107477098B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB970881A (en) * | 1960-12-05 | 1964-09-23 | Maag Zahnraeder & Maschinen Ag | Self-engaging synchronous clutch |
| US3441116A (en) * | 1966-12-13 | 1969-04-29 | United Aircraft Corp | Electrically operated clutch mechanism |
| US4053038A (en) * | 1976-08-12 | 1977-10-11 | Philadelphia Gear Corporation | Self-synchronizing clutch |
| JP2004125030A (en) * | 2002-10-01 | 2004-04-22 | Fuji Heavy Ind Ltd | Transmission |
| US20160160937A1 (en) * | 2013-07-19 | 2016-06-09 | Renk-Maag Gmbh | Synchronizing clutch |
-
2017
- 2017-09-26 CN CN201710884301.9A patent/CN107477098B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB970881A (en) * | 1960-12-05 | 1964-09-23 | Maag Zahnraeder & Maschinen Ag | Self-engaging synchronous clutch |
| US3441116A (en) * | 1966-12-13 | 1969-04-29 | United Aircraft Corp | Electrically operated clutch mechanism |
| US4053038A (en) * | 1976-08-12 | 1977-10-11 | Philadelphia Gear Corporation | Self-synchronizing clutch |
| JP2004125030A (en) * | 2002-10-01 | 2004-04-22 | Fuji Heavy Ind Ltd | Transmission |
| US20160160937A1 (en) * | 2013-07-19 | 2016-06-09 | Renk-Maag Gmbh | Synchronizing clutch |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107477098B (en) | 2019-07-26 |
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Inventor after: Zhu Chu Inventor after: Kang Lixia Inventor after: Wang Yonghong Inventor after: Tang Xin Inventor after: Yang Zhenrong Inventor after: Yin Mei Inventor after: Xiong Xingbo Inventor before: Zhu Chu Inventor before: Wang Yonghong Inventor before: Tang Xin Inventor before: Yang Zhenrong Inventor before: Yin Mei Inventor before: Xiong Xingbo |
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