CN216447394U - Planetary bevel gear limited slip differential structure - Google Patents
Planetary bevel gear limited slip differential structure Download PDFInfo
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- CN216447394U CN216447394U CN202123432535.0U CN202123432535U CN216447394U CN 216447394 U CN216447394 U CN 216447394U CN 202123432535 U CN202123432535 U CN 202123432535U CN 216447394 U CN216447394 U CN 216447394U
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- 238000003825 pressing Methods 0.000 claims description 29
- 239000003921 oil Substances 0.000 claims description 15
- 239000010687 lubricating oil Substances 0.000 claims description 5
- 238000010276 construction Methods 0.000 claims 1
- 238000009826 distribution Methods 0.000 abstract description 6
- 230000008859 change Effects 0.000 abstract description 2
- 230000004044 response Effects 0.000 abstract description 2
- 230000035945 sensitivity Effects 0.000 abstract description 2
- 230000007246 mechanism Effects 0.000 description 9
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
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- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
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Abstract
The utility model discloses a limited slip differential structure of a planetary bevel gear, which is characterized in that an inner gear shaft seat is arranged in a differential shell, a plurality of inner gear shaft holes are arrayed in the circumferential direction of an outer ring of the inner gear shaft seat, planetary gears are installed in the inner gear shaft holes on the inner gear shaft seat through planetary gear shafts, an included angle between the axis of each inner gear shaft hole and the axis of the inner gear shaft seat is an acute angle to form a planetary gear which is arranged obliquely, the working force arms of two half shaft gears of the limited slip differential of the planetary bevel gear are different, so that the torques transmitted to front and rear shafts are different in a natural state, an automobile can better exert performance, and the differential can dynamically change the distribution of the torques of the front and the rear shafts by completely depending on a mechanical structure, namely the front shaft half shaft gear and the rear shaft half shaft gear which are meshed with different tooth numbers, and has the advantages of rapid response, high sensitivity, strong reliability and light weight.
Description
Technical Field
The utility model relates to the field of planetary bevel gear differentials, in particular to a limited slip differential structure of a planetary bevel gear.
Background
In the prior art, the interaxle differential mechanism commonly used for the all-wheel drive automobile is a symmetrical planetary bevel gear type differential mechanism, a Torsen differential mechanism, a multi-disc clutch type differential mechanism and the like. But the symmetrical planetary bevel gear type differential has no limited slip function; the Torsen differential has complex parts, high cost and heavy weight; thermal degradation of the friction plates of a multi-plate clutch type differential is likely to cause failure of the differential. Conventional all-wheel drive automotive interaxle differentials have some drawbacks.
In addition, the conventional inter-axle differential does not generally consider the relationship between the power distribution and the axle load of the vehicle in a natural condition, and thus cannot sufficiently exhibit the vehicle performance.
Therefore, a new structure of the inter-axle differential is needed to solve the above problems.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a limited slip differential structure of a bevel planet gear, which overcomes the defects of the prior art, asymmetrically distributes torque in a natural state, dynamically changes the distribution of the torque by depending on a mechanical structure during differential, can better exert the performance of an automobile, and has the advantages of simple structure, light weight and easy processing.
A limited slip differential structure of a planetary bevel gear comprises a differential shell, a planetary gear, a front axle half shaft gear, a front axle gear pressing plate, a thread pressing plate, a planetary gear shaft, a shaft pin, a friction plate inner plate, a friction plate outer plate, a rear axle half shaft gear and a rear axle gear pressing plate;
the planetary gear is transversely positioned with the differential shell through a planetary gear shaft and longitudinally positioned through a shaft pin, so that the planetary gear is prevented from moving along the axial direction of the planetary gear; the front axle half shaft gear and the rear axle half shaft gear are simultaneously meshed with the planetary gears on two sides of the planetary gears;
the front axle gear pressing plate and the rear axle gear pressing plate are used for limiting the front axle half axle gear and the rear axle half axle gear respectively, grooves are formed in the end portions of the front axle gear pressing plate and the rear axle gear pressing plate respectively, bosses are arranged on the back portions of the front axle half axle gear and the rear axle half axle gear, and one sides of the grooves formed in the front axle gear pressing plate and the rear axle gear pressing plate are matched with the bosses on the back surfaces of the front axle half axle gear and the rear axle half axle gear respectively; bosses are arranged on the other sides of the front shaft gear pressing plate and the rear shaft gear pressing plate and are respectively matched with the limiting parts protruding inwards of the front friction plate inner plate and the rear friction plate inner plate; the outer plates and the inner plates of the friction plates are alternately arranged, and the outwards protruded rectangular parts of the outer plates of the friction plates are matched with the grooves of the differential shell; the screw thread pressure plate is matched with the differential shell through screw threads, and the inner side of the screw thread pressure plate is pressed on the friction plate.
The planetary gears are of bevel gear structures and are uniformly distributed around the central axis of the differential shell in an annular mode, and the end faces of the planetary gears are all planes, so that the planetary gears can be conveniently assembled with the differential shell.
Furthermore, the included angle between the axis of the planet gear shaft and the axis of the differential case is an acute angle, namely the planet gear shaft is obliquely arranged, and the included angle between the axis of the planet gear and the axes of the two half-shaft gears is an acute angle for ensuring the meshing condition.
The front axle half shaft gear and the rear axle half shaft gear are both in bevel gear structures, and each side half shaft gear is meshed with 4 planetary gears simultaneously.
Furthermore, the ratio of the number of teeth of the front axle side gear and the rear axle side gear is equal to the ratio of front and rear axle loads, and the front and rear axle gears are used for proportionally distributing the torque of the front and rear output shafts, so that the automobile can better exert the performance.
Furthermore, spline grooves are formed in middle holes of the front axle half shaft gear and the rear axle half shaft gear and used for being connected with driving shafts on two sides.
The differential shell is a casting part, the outermost cylindrical thin shell is used for transmitting torque, and the size of the groove is consistent with that of the rectangular part of the outer plate of the friction plate. The inner part of the shell is milled to form a corresponding hollow cylinder according to the size of the planetary gear, a hole is formed in the outer part of the shell along the direction of the planetary gear shaft, and a positioning pin hole is formed in an outer gear shaft seat.
Preferably, an axial through hole of the inner gear shaft seat in the central part of the differential shell is provided with a spline groove for connecting the differential shell with an output shaft of the gearbox, and a retainer ring is arranged on the axial through hole of the inner gear shaft seat and used for axially positioning the output shaft.
Preferably, the differential case has female threads formed at both side edge portions thereof for fixing the threaded pressure plate. The internal gear shaft seat at the central part of the differential shell is connected with the shell of the differential shell by 4 reinforced connecting parts and is used for transmitting the output torque of the gearbox.
The front shaft gear pressing plate and the rear shaft gear pressing plate are provided with holes and spline grooves for realizing radial positioning of the front output driving shaft and the rear output driving shaft. The gear pressure plate boss is provided with an oil inlet hole for lubricating the differential mechanism.
The inner plate and the outer plate of the friction plate are made of metal materials and are provided with oil grooves and oil holes, so that lubricating oil can fully play a role in heat dissipation and lubrication, and the service life of the friction plate is prolonged.
The threaded pressure plate is provided with an oil hole for injecting lubricating oil into the differential.
The working principle of the utility model is as follows:
the power input shaft inputs power to an inner gear shaft seat in a differential shell, the inner gear shaft seat drives four planetary gears, the planetary gears revolve along with the gearbox shell under the driving of a planetary gear shaft and a shaft pin, the planetary gears drive two half axle gears to rotate in a meshing mode, the half axle gears on two sides drive a front output shaft and a rear output shaft to rotate through splines, and the power is transmitted to the front shaft and the rear shaft.
The rotation of the half axle gear can drive the inner plate of the friction plate to rotate at the same time, the inner plate of the friction plate drives the outer plate to rotate through friction, and the outer plate drives the whole differential mechanism to rotate.
When the two half-axle gears have a rotation speed difference, the planetary gear can rotate to drive the two half-axle gears, the planetary gear can force the half-axle gears to generate an axial force, the axial force can enable the half-axle gears to generate axial displacement to press the metal friction plates, the metal friction plates can generate an engaging torque, and therefore the torque distribution of the front shaft and the rear shaft is changed.
Compared with the prior art, the utility model has the following beneficial technical effects:
according to the limited slip differential structure of the planetary bevel gear, the inner gear shaft seat is arranged in the differential shell, the plurality of inner gear shaft holes are arrayed in the circumferential direction of the outer ring of the inner gear shaft seat, the planetary gears are installed in the inner gear shaft holes in the inner gear shaft seat through the planetary gear shafts, the included angle between the axis of each inner gear shaft hole and the axis of the inner gear shaft seat is an acute angle, the planetary gears which are arranged in an inclined mode are formed, the working force arms of two half shaft gears of the formed limited slip differential of the planetary bevel gear are different, the torque transmitted to the front shaft and the rear shaft under the natural state is different, and the automobile can better exert the performance.
The differential mechanism can dynamically change the distribution of the torque of the front axle and the rear axle by completely depending on a mechanical structure, namely a front axle half shaft gear and a rear axle half shaft gear which are meshed by different tooth numbers, and has the advantages of rapid response, high sensitivity, strong reliability and light weight.
The inner gears of the differential are all bevel gears, so that the structure is simple, the process is mature, and the production and the processing are easy.
Drawings
Fig. 1 is a sectional view of a differential structure according to the present invention.
FIG. 2 is a front view of the differential case of the present invention.
FIG. 3 is a side view of the differential case of the present invention.
Fig. 4 is a cross-sectional view of a rear axle gear pressure plate in accordance with the present invention.
Fig. 5 is a side view of the rear axle gear press plate of the present invention.
FIG. 6 is a schematic view of the inner plate of the friction plate of the present invention.
FIG. 7 is a schematic view of the outer plate of the friction plate of the present invention.
FIG. 8 is a schematic view of a threaded platen of the present invention.
Fig. 9 is a schematic perspective view of the differential case according to the present invention.
Fig. 10 is a schematic view of the assembly structure of the integrated device of the present invention.
In the figure: 1-a differential housing; 2-a planetary gear; 3-front axle half shaft gear; 4-front axle gear pressing plate; 5-a threaded platen; 6-planetary gear shaft; 7-axle pin; 8-inner plate of friction plate; 9-outer plate of friction plate; 10-rear axle side gear; 11-rear axle gear press plate; 12-internal gear shaft seat; 13-a reinforcing connection; 14-external gear shaft seat; 15-a power take-off shaft; 16-front axle output shaft; 17-rear axle output shaft; 18-friction plate groove.
Detailed Description
In order to make those skilled in the art better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the utility model described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
As shown in fig. 1 and 9, a limited slip differential structure of a planetary bevel gear comprises a differential shell 1, a planetary gear 2, a front axle half-shaft gear 3, a front axle gear pressure plate 4, a threaded pressure plate 5, a planetary gear shaft 6, a shaft pin 7, a friction plate inner plate 8, a friction plate outer plate 9, a rear axle half-shaft gear 10 and a rear axle gear pressure plate 11;
an inner gear shaft seat 12 is arranged in the differential shell 1, the inner gear shaft seat 12 is connected with the inside of the differential shell 1 through a plurality of reinforcing connecting parts 13 which are arrayed in the circumferential direction to form an integral structure, an outer gear shaft seat 14 is correspondingly arranged on the inner wall of the differential shell 1, each inner gear shaft seat 12 and each outer gear shaft seat 14 are respectively provided with a gear shaft hole, the inner gear shaft seats 12 and the gear shaft holes on the outer gear shaft seats 14 are in one-to-one correspondence to form a plurality of groups of coaxial gear shaft holes, and the planetary gear shafts 6 are arranged in the gear shaft holes of the same group;
the planetary gear 2 is transversely positioned with the differential housing 1 through a planetary gear shaft 6, a positioning pin hole is formed in the outer gear shaft seat 14 along the radial direction, the planetary gear shaft 6 is fixedly connected with the outer gear shaft seat 14 through a shaft pin 7, and the planetary gear 2 is longitudinally positioned through the shaft pin 7; the front axle half-shaft gear 3 and the rear axle half-shaft gear 10 are simultaneously meshed with the planet gear 2 at two sides of the planet gear 2; one side of the front shaft gear pressing plate 4 and one side of the rear shaft gear pressing plate 11, which are provided with grooves, are respectively matched with bosses on the back surfaces of the front shaft half-shaft gear 3 and the rear shaft half-shaft gear 10, and bosses on the other side are respectively matched with inward protruding oval parts of the front friction plate inner plate and the rear friction plate inner plate 8; the outer plates 9 and the inner plates of the friction plates are alternately arranged, and the outwards protruded rectangular parts of the outer plates 9 of the friction plates are matched with the grooves of the differential shell 1; the threaded pressure plate 5 is matched with the differential case 1 through threads, and the inner side of the threaded pressure plate is pressed on the friction plate.
The planet gears 2 are of bevel gear structures and are uniformly distributed around the central axis of the differential shell 1 in an annular mode; the end faces of the planet gears 2 are flat surfaces, so that the planet gears are convenient to assemble with the differential case 1.
Preferably, the axis of the planet gear shaft 6 is inclined relative to the axis of the differential case, the front axle half-shaft gear 3 and the rear axle half-shaft gear 10 are coaxially arranged, the included angle between the axis of the planet gear shaft 6 and the axis of the front axle half-shaft gear 3 is an acute angle for ensuring the meshing condition, the planet gear 2 adopts a bevel gear, and the front axle half-shaft gear 3 and the rear axle half-shaft gear 10 have different tooth numbers to form a meshing difference.
Set up 4 planetary gears in this application differential mechanism casing, front axle side gear 3, rear axle side gear 10 all adopt the bevel gear structure, and each side gear meshes with 4 planetary gears simultaneously.
The ratio of the number of teeth of the front axle side gear 3 to the rear axle side gear 10 is equal to the ratio of the front and rear axle loads, and is used for distributing the torque of the front and rear output shafts in proportion, so that the automobile can better exert the performance.
As shown in fig. 10, preferably, the differential case 1 has spline grooves on its axis at the central portion for connecting the case to the output shaft of the transmission case, and a position of the retaining ring is set aside for axial positioning of the output shaft. Spline grooves are formed in middle holes of the front axle half shaft gear 4 and the rear axle half shaft gear 10 and are used for being connected with driving shafts on two sides; the axial through hole of the internal gear shaft seat 12 is in key connection with the power output shaft 15; the front axle half shaft gear 3 is connected with a front axle output shaft 16 through a key, the rear axle half shaft gear 10 is connected with a rear axle output shaft 17 through a key, and the power output shaft 15 is coaxially nested with the front axle output shaft 16 or the rear axle half shaft gear 10.
Preferably, the differential case 1 has female threads formed at both side edge portions thereof for fixing the threaded pressure plate 5. The central part is connected with the outer shell by 4 ribbed plates and is used for transmitting the output torque of the gearbox.
The central parts of the front shaft gear pressing plate 4 and the rear shaft gear pressing plate 11 are provided with holes and spline grooves for realizing the radial positioning of the front output driving shaft and the rear output driving shaft. The gear pressure plate boss is provided with an oil inlet hole for lubricating the differential mechanism.
The inner plate 8 and the outer plate 9 are made of metal materials and are provided with oil grooves and oil holes for ensuring that lubricating oil can fully play a role in heat dissipation and lubrication and prolonging the service life of the friction plate.
And the threaded pressure plate 5 is provided with an oil hole for injecting lubricating oil into the differential.
Fig. 2 and 3 are schematic views of the differential housing of the present invention employing an inclined planet carrier for lateral and longitudinal positioning of the planet gears, ensuring that two half-axis gears with different working arms can simultaneously mesh with the planet gears. The grooves on the shell are used for being matched with the rectangular protruding parts of the outer plates of the friction plates to transmit torque, and dynamic distribution of the torque of the front shaft and the torque of the rear shaft is achieved.
Fig. 4 and 5 are schematic diagrams of the rear axle gear pressure plate of the utility model, which is structurally characterized in that one side of the rear axle gear pressure plate is processed into a circular boss, the radius of the circular boss is the same as that of the inner ring of the inner plate of the friction plate, a plurality of circular grooves are formed, and the other side of the rear axle gear pressure plate is processed into a groove, the radius of the groove is the same as that of the thin boss on the end surface of the rear axle half-shaft gear. The gear pressing plate is provided with a plurality of through oil holes, and the center part of the gear pressing plate is provided with a spline groove.
FIG. 6 is a schematic diagram of the inner plate structure of the friction plate of the present invention, in which the shape of the inner ring is the same as the shape of the groove on the boss of the gear pressing plate, and the inner plate is provided with oil grooves and oil holes.
FIG. 7 is a schematic structural view of the outer plate of the friction plate of the present invention, in which the rectangular protrusions of the outer ring have the same width as the grooves of the outer portion of the differential case, and are provided with oil grooves and oil holes.
FIG. 8 is a schematic view of the structure of the screw pressing plate of the present invention, which is a thin circular ring with a screw thread on the side and a plurality of oil holes on the end surface.
Referring to fig. 1, the asymmetric bevel planet gear limited slip differential structure of the present invention is installed as follows:
firstly, a planetary gear is arranged in a differential shell, and a planetary gear shaft and a shaft pin are used for positioning;
secondly, two side gears are arranged in the differential shell from two sides, so that the side gears are meshed with a plurality of planet gears simultaneously;
then, matching one side of the groove of the gear pressing plate with a boss on the back of the half axle gear;
then, the oval bulges of the inner plates of the friction plates are clamped in the oval grooves of the gear pressing plate, the rectangular bulges of the outer plates of the friction plates are clamped in the grooves of the differential shell, and the inner plates and the outer plates of the friction plates are alternately arranged;
finally, the threaded pressure plate is screwed to the differential housing.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the utility model as defined in the appended claims.
Claims (10)
1. A limited slip differential structure of a planetary bevel gear is characterized by comprising a differential shell (1), wherein an inner gear shaft seat (12) is arranged in the differential shell (1), the inner gear shaft seat (12) is connected with the inside of the differential shell (1) through a plurality of reinforced connecting parts (13) in a circumferential array, the inner gear shaft seat (12) is provided with an axial through hole, the inner gear shaft seat (12) is coaxial with the differential shell (1), a plurality of inner gear shaft holes are circumferentially arrayed on the outer ring of the inner gear shaft seat (12), a planetary gear (2) is installed in the inner gear shaft hole on the inner gear shaft seat (12) through a planetary gear shaft (6), the included angle between the axis of the inner gear shaft hole and the axis of the inner gear shaft seat (12) is an acute angle, a front half shaft gear (3) and a rear half shaft gear (10) which are meshed with the planetary gear (2) are respectively arranged at two ends of the inner gear shaft seat (12), the end parts of the front axle side gear (3) and the rear axle side gear (10) are respectively installed and positioned through gear pressing plates.
2. The limited slip differential structure of a planetary bevel gear according to claim 1, characterized in that the inner wall of the differential case (1) is circumferentially arrayed with outer gear shaft seats (14) equal in number to the inner gear shaft holes, each outer gear shaft seat (14) is provided with an outer gear shaft hole, each outer gear shaft hole is correspondingly and coaxially provided with an inner gear shaft hole, and the other end of the planetary gear shaft (6) in each inner gear shaft hole is inserted into the outer gear shaft hole.
3. The limited slip differential structure of the planetary bevel gear according to claim 2, wherein the external gear shaft seat (14) is provided with a pin hole whose axis is perpendicular to the axis of the external gear shaft hole, the planetary gear shaft (6) is provided with a positioning pin hole, and the planetary gear shaft (6) is fixedly connected with the external gear shaft seat (14) through a shaft pin (7).
4. A limited slip differential arrangement as claimed in claim 1, wherein the axial through bore of the internal gear shaft seat (12) is keyed to the power take-off shaft (15).
5. A limited slip differential architecture for bevel planet gears as defined in claim 4 wherein the front axle side gear (3) is keyed to a front axle output shaft (16) and the rear axle side gear (10) is keyed to a rear axle output shaft (17), the power output shaft (15) being nested coaxially within the front axle output shaft (16) or the rear axle side gear (10).
6. A limited slip differential structure of a planetary bevel gear according to claim 1, characterized in that the outside of both ends of the differential case (1) are arrayed with limit grooves along the circumferential direction, and the limit grooves are opened along the axial direction of the differential case (1).
7. The bevel planet gear limited slip differential structure according to claim 1, wherein the outer ring of the end of the gear pressing plate is provided with a friction plate groove (18), the friction plate groove (18) is arrayed along the circumference of the gear pressing plate, the gear pressing plate is sleeved with a plurality of friction plate inner plates (8) and friction plate outer plates (9) which are sequentially arranged at intervals, the inner ring of each friction plate inner plate (8) is provided with a limiting part positioned in the friction plate groove (18), the outer ring of each friction plate outer plate (9) is provided with a boss positioned in the limiting groove of the end of the differential housing (1), and the end face of the innermost friction plate inner plate (8) is in contact with the end face of the gear pressing plate.
8. A limited slip differential structure for bevel planet gears according to claim 1, wherein the differential case has internal threads at both side edge portions thereof, and the outer ends of the gear presser plates are provided with screw thread pressure plates (5) which are connected to the internal threads at both sides of the differential case.
9. A limited slip differential arrangement for bevel planet gears according to claim 1, characterised in that four planet gears (2) are mounted in a circumferential array within the differential housing (1).
10. A limited slip differential construction for bevel planet gears according to claim 8, characterized in that the threaded pressure plate (5) is provided with oil holes for feeding lubricating oil into the differential.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123432535.0U CN216447394U (en) | 2021-12-30 | 2021-12-30 | Planetary bevel gear limited slip differential structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123432535.0U CN216447394U (en) | 2021-12-30 | 2021-12-30 | Planetary bevel gear limited slip differential structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216447394U true CN216447394U (en) | 2022-05-06 |
Family
ID=81377528
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123432535.0U Expired - Fee Related CN216447394U (en) | 2021-12-30 | 2021-12-30 | Planetary bevel gear limited slip differential structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216447394U (en) |
-
2021
- 2021-12-30 CN CN202123432535.0U patent/CN216447394U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20220506 |