CN111022607A - Differential gear connecting structure - Google Patents
Differential gear connecting structure Download PDFInfo
- Publication number
- CN111022607A CN111022607A CN201910954633.9A CN201910954633A CN111022607A CN 111022607 A CN111022607 A CN 111022607A CN 201910954633 A CN201910954633 A CN 201910954633A CN 111022607 A CN111022607 A CN 111022607A
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- driven gear
- shaft section
- differential
- connection structure
- spline
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- 238000006073 displacement reaction Methods 0.000 claims abstract description 6
- 230000005540 biological transmission Effects 0.000 abstract description 7
- 230000009977 dual effect Effects 0.000 abstract description 2
- 238000013461 design Methods 0.000 description 4
- 230000006872 improvement Effects 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
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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
- F16H48/00—Differential gearings
- F16H48/38—Constructional details
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
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Abstract
The invention provides a differential gear connecting structure which comprises a differential shell and a driven gear, wherein an assembling shaft section for assembling the driven gear is arranged on the differential shell, the driven gear is assembled on the assembling shaft section, the assembling shaft section and the driven gear are connected through splines, the torque transmission capacity can be greatly improved by adopting spline connection, an external spline is arranged on the assembling shaft section, an internal spline is arranged in an inner hole of the driven gear, the internal spline and the external spline are in interference fit, a step is arranged at one end of the assembling shaft section, a stop block for stopping the axial displacement of the driven gear is arranged at the other end of the assembling shaft section, and the driven gear is arranged between the step and the stop block. Adopt spline interference fit and dog axial spacing dual fail-safe, reduce the risk. The spline is connected together and then the teeth are ground, and the meshing progress of the driven gear can be improved. Can reduce cost, reduce weight and improve quality.
Description
Technical Field
The invention relates to the technical field of automobile parts, in particular to a gear connecting structure of a differential mechanism.
Background
The differential mechanism can enable left and right (or front and rear) driving wheels of the automobile to rotate at different rotating speeds, and is an essential part of the automobile. The power of the engine enters the differential through the transmission shaft, particularly, a driving driven gear is arranged on the transmission shaft, a driven gear is arranged on the differential shell, and the driven gear is meshed to transmit torque. The conventional methods for assembling the differential case and the driven gear, which are generally bolted and/or riveted by rivets, have the following problems: 1. the existing bolt connection mode is characterized in that the differential shell and the gear are connected as finished products due to the manufacturing tolerance of parts, so that the actual action precision of the gear precision is lower; 2. the differential shell and the gear need to be drilled and tapped, the working procedures are more, bolts need to be added, and the cost is high; 3. the two connecting parts need to be overlapped partially, so that the weight is heavy; 4. because the friction force generated by the pretightening force of the bolt is used for transmitting the torque, the torque transmission capacity of the bolt is limited.
Disclosure of Invention
In view of the above, the present invention provides a differential gear connecting structure, which reduces the number of bolts and the number of processing holes for reducing the cost, weight and quality of the differential gear connecting structure and the driven gear compared to the bolt or rivet structure.
The invention solves the technical problems by the following technical means: the invention provides a differential gear connecting structure which comprises a differential shell and a driven gear, wherein an assembling shaft section for assembling the driven gear is arranged on the differential shell, the driven gear is assembled on the assembling shaft section, the assembling shaft section is connected with the driven gear through a spline, an external spline is arranged on the assembling shaft section, an internal spline is arranged on an inner hole of the driven gear, the internal spline and the external spline are in interference fit, a step is arranged at one end of the assembling shaft section, a stop block for stopping the axial displacement of the driven gear is arranged at the other end of the assembling shaft section, and the driven gear is arranged between the step and the stop block.
Furthermore, the check block is a clamping ring, and one end, far away from the step, of the assembling shaft section is provided with an annular clamping groove for mounting the clamping ring.
Further, the width of rand is A3, the distance that the draw-in groove is kept away from between the side of step and the step is A2, the distance that the draw-in groove is close to between the side of step and the step is A4, driven gear wheel hub width is A1, and A3< A2-A1, A4< A1.
Further, the axial clearance H between the clamping ring and the driven gear is smaller than 0.05mm, and a gasket is selected during assembly
Assembly, i.e. H = a2-a1-A3<0.05 mm.
Furthermore, a first inclined plane is arranged on the side face, far away from the step, of the clamping groove, a second inclined plane with the same angle as the first inclined plane is arranged on the position, corresponding to the first inclined plane, of the clamping groove, the clamping groove is prevented from falling off by the inclined plane friction self-locking principle, and meanwhile, due to the fact that the inclined plane is arranged, the clamping ring is reasonably designed, and the clamping ring can be limited without side gaps.
Further, an included angle B between the first inclined surface and the axis of the assembling shaft section is 75-85 degrees.
Furthermore, the stop block is a pin shaft, a mounting hole for mounting the pin shaft is formed in one end, far away from the step, of the assembly shaft section, the pin shaft is in interference fit with the mounting hole, and the mounting hole is formed in the circumferential surface of the assembly shaft section.
Furthermore, the number of the pin shafts is at least 2, and the pin shafts are uniformly arranged on the circumferential surface of the assembly shaft section.
Further, driven gear's hole is being kept away from the step one side and is being provided with the chamfer, the assembly shaft section is kept away from step one end and is formed and form with the chamfer phase-match to keeping away from its axis direction slope is that the inclined plane butt forms the dog on the chamfer.
According to the technical scheme, the invention has the beneficial effects that: the invention provides a differential gear connecting structure which comprises a differential shell and a driven gear, wherein an assembling shaft section for assembling the driven gear is arranged on the differential shell, the driven gear is assembled on the assembling shaft section, the assembling shaft section and the driven gear are connected through splines, a spline connection mode is adopted, then a hot post-grinding mode is adopted, finally the design and use precision of the driven gear is greatly improved, the NVH performance is improved, the processes and parts are greatly reduced, the cost is reduced, and the weight is also reduced. The spline coupling can also greatly improve the torque transmission capability. The assembly shaft section is provided with an external spline, the driven gear inner hole is provided with an internal spline, the internal spline is in interference fit with the external spline, one end of the assembly shaft section is provided with a step, the other end of the assembly shaft section is provided with a stop block used for stopping axial displacement of the driven gear, and the driven gear is arranged between the step and the stop block. Driven gear adopts the internal spline, and differential casing adopts the external spline, and driven gear and differential casing hookup adopt the mode of internal and external spline fit to couple, for preventing that driven gear has the risk of droing because of the condition of atress axial force, adopts spline interference fit and the spacing dual fail-safe of dog axial two kinds of modes, reduces the risk. For bolt or rivet structure, differential mechanism casing and driven gear reduce the bolt, reduce the processing hole site, and the spline couples together the back gear grinding again, can also promote driven gear meshing progress. Can reduce cost, reduce weight and improve quality. And the torque transmission capacity of the spline link is higher than that of the bolt link which transmits torque by means of friction force.
Drawings
In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
FIG. 1 is a cross-sectional view of a first embodiment of a differential gear connection structure of the present invention;
FIG. 2 is an enlarged partial view of the differential gear connection shown in FIG. 1 at position D;
FIG. 3 is a sectional view of a second embodiment of the differential gear connection structure of the present invention;
FIG. 4 is an enlarged fragmentary view of the differential gear connection shown in FIG. 3 at location E;
FIG. 5 is a sectional view of a third embodiment of a differential gear connection structure according to the present invention;
FIG. 6 is an enlarged fragmentary view of the differential gear connection shown in FIG. 5 at position F;
FIG. 7 is a cross-sectional view of a fourth embodiment of the differential gear connection structure of the present invention;
FIG. 8 is an enlarged partial view of the differential gear connection shown in FIG. 7 at position G;
FIG. 9 is an enlarged fragmentary view of the differential gear connection shown in FIG. 7 at the location G when not clinched;
reference numerals:
1-a differential housing; 2-a driven gear; 11-assembling the shaft section; 21-chamfering; 31-a collar; 32-card slot; 33-a first bevel; 34-a pin shaft; 35-inclined plane; 4-spline.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
In the description of the application, it is to be understood that the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be considered limiting of the application. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art through specific situations.
The first embodiment of the invention, referring to fig. 1-2, provides a differential gear connection structure, which includes a differential housing 1 and a driven gear 2, wherein an assembly shaft section 11 for assembling the driven gear 2 is arranged on the differential housing 1, the driven gear 2 is assembled on the assembly shaft section 11, the assembly shaft section 11 and the driven gear 2 are connected through a spline 4, a spline 4 connection mode is adopted, then a hot post-grinding mode is adopted, and finally the design and use precision of the driven gear 2 is greatly improved, the NVH performance is improved, the processes and parts are greatly reduced, the cost is reduced, and the weight is also reduced. The spline 4 can be used for connection, so that the torque transmission capacity can be greatly improved. Set up external splines 4 on the assembly shaft section 11, set up internal splines 4 on the 2 holes of driven gear, internal splines 4 and 4 interference fit of external splines, the one end of assembly shaft section 11 is provided with the step, and the dog that is used for blockking 2 axial displacement of driven gear is installed to the other end, driven gear 2 installs between step and dog. Driven gear 2 adopts internal spline 4, and differential housing 1 adopts external spline 4, and driven gear 2 and the hookup of differential housing 1 adopt the mode of internal and external splines 4 complex to couple, has the risk of droing for preventing driven gear 2 because of the condition of atress axial force, adopts 4 interference fit of splines and the spacing two kinds of modes double insurance of dog axial, reduces the risk. Compared with a bolt or rivet structure, the differential case 1 and the driven gear 2 are provided with less bolts and less processing hole positions, the spline 4 is connected together and then the gear is ground, and the meshing progress of the driven gear 2 can be improved. Can reduce cost, reduce weight and improve quality.
As a further improvement to the above technical solution, the stopper is a collar 31, and an end of the assembling shaft segment 11 away from the step is provided with an annular clamping groove 32 for mounting the collar 31. Spline 4 adopts interference design and adopts the spacing mode of rand 31 to carry out the axial spacing, can improve the security by a wide margin.
As a further improvement to the above technical solution, the width of the collar 31 is A3, the distance between the side of the slot 32 far from the step and the step is a2, the distance between the side of the slot 32 near the step and the step is a4, the width of the hub of the driven gear 2 is a1, A3< a2-a1, and a4< a 1. During installation, the distance A2-A1 is calculated through measurement, so that the selection of the collar 31 is carried out, the width of the collar 31 is smaller than A2-A1, the installation of the collar 31 is facilitated, but in order to effectively control the direction size of the driven gear 2, the gap between the collar 31 and the driven gear 2 after the collar 31 is installed is preferably smaller, the axial gap H between the collar 31 and the driven gear 2 is smaller than 0.05mm, namely H = A2-A1-A3 is smaller than 0.05mm, the installation of the collar 31 and the axial size of the driven gear 2 can be considered simultaneously, the product precision is effectively improved, and the assembly difficulty is effectively reduced.
In the second embodiment, referring to fig. 3 to 4, a first inclined plane 33 is disposed on a side surface of the locking groove 32 away from the step, and a second inclined plane having the same angle as the first inclined plane 33 is disposed on a position of the locking groove 32 corresponding to the first inclined plane 33. The clamping groove 32 and the clamping ring 31 are provided with the corresponding first inclined surface 33 and the corresponding second inclined surface, so that the clamping ring 31 has a self-locking function, a pad does not need to be selected, the falling is prevented by utilizing an inclined surface friction self-locking principle, and meanwhile, the clamping ring is reasonably designed due to the inclined surface, so that the clamping ring is limited without side gaps. Simultaneously because the effect of holding tightly of snap ring, can effectively eliminate driven gear 2's axial clearance F control driven gear 2's axis size to can effective control, prevent driven gear 2's axial drive, make driven gear 2's axial dimension precision higher simultaneously.
As a further improvement to the technical scheme, the included angle B between the first inclined surface 33 and the axis of the assembling shaft section 11 is 75-85 degrees. The included angle B between the first inclined surface 33 and the axis of the assembling shaft section 11 is controlled to be 75-85 degrees, so that the self-locking can be realized under the condition of axial force, the installation is convenient, and the strength of the clamping ring 31 is not influenced.
In the third embodiment, referring to fig. 5 to 6, the stopper is a pin 34, the spline 4 is axially limited by adopting an interference design and a pin limiting manner to improve safety, an end of the assembly shaft segment 11, which is far away from the step, is provided with a mounting hole for mounting the pin 34, the pin 34 is in interference fit with the mounting hole, so that the pin 34 is prevented from falling off in the rotation process due to the interference fit between the pin 34 and the mounting hole, and the mounting hole is formed in the circumferential surface of the assembly shaft segment 11. The stop block is provided with the pin shaft 34, only a small amount of drilling is needed to be carried out on the assembly shaft section 11 to obtain the mounting hole, and meanwhile, the pin shaft 34 is simple and convenient to mount.
As a further improvement of the above technical solution, at least 2 pin shafts 34 are provided, and the pin shafts 34 are uniformly installed on the circumferential surface of the assembling shaft segment 11. A plurality of pins 34 are provided and uniformly mounted on the mounting shaft segment 11, so that the driven gear 2 is evenly stressed in the axial direction. Preferably, set up 3 round pin axles 34 as axial spacing to install 3 even installing of round pin axle 34 at assembly shaft section 11, use 3 round pin axles 34 to reduce the quantity of punching when effectively restricting driven gear 2's axial displacement, reduce the processing degree of difficulty and improve machining efficiency.
In a fourth embodiment, referring to fig. 7 to 9, a chamfer is arranged on the side, away from the step, of the inner hole of the driven gear, and the end, away from the step, of the assembling shaft section inclines towards the direction away from the axis of the assembling shaft section to form a stop which is matched with the chamfer in a manner that the inclined surface abuts against the chamfer. After the gear is installed on the differential shell, the differential shell is pressed and riveted to form an inclined plane to be used as a stop block for axial limiting, and safety is improved.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.
Claims (9)
1. The utility model provides a differential gear connection structure, includes differential casing (1) and driven gear (2), be provided with assembly shaft section (11) that are used for assembling driven gear (2) on differential casing (1), driven gear (2) assemble on assembly shaft section (11), its characterized in that: assembly shaft section (11) and driven gear (2) are connected through spline (4), set up external splines (4) on assembly shaft section (11), set up internal splines (4) on driven gear (2) hole, internal splines (4) and external splines (4) interference fit, the one end of assembly shaft section (11) is provided with the step, and the dog that is used for blockking driven gear (2) axial displacement is installed to the other end, driven gear (2) are installed between step and dog.
2. A differential gear connection structure as defined in claim 1, wherein: the stop block is a clamping ring (31), and one end, far away from the step, of the assembling shaft section (11) is provided with an annular clamping groove (32) for mounting the clamping ring (31).
3. A differential gear connection structure as defined in claim 2, wherein: the width of rand (31) is A3, the distance that the draw-in groove (32) is kept away from between the side of step and the step is A2, the distance that the draw-in groove (32) is close to between the side of step and the step is A4, driven gear (2) wheel hub width is A1, and A3< A2-A1, A4< A1.
4. A differential gear connection structure as defined in claim 3, wherein: the axial clearance H between the collar (31) and the driven gear (2) is less than 0.05mm, namely H = A2-A1-A3<0.05 mm.
5. A differential gear connection structure as defined in claim 2, wherein: the side face, far away from the step, of the clamping groove (32) is provided with a first inclined face (33), a second inclined face with the same angle as the first inclined face (33) is arranged at the position, corresponding to the first inclined face (33), of the clamping groove (32), and the clamping groove is prevented from falling off by means of the friction self-locking principle.
6. A differential gear connection structure as defined in claim 5, wherein: and the included angle B between the first inclined surface (33) and the axis of the assembling shaft section (11) is 75-85 degrees.
7. A differential gear connection structure as defined in claim 1, wherein: the stop block is a pin shaft (34), a mounting hole for mounting the pin shaft (34) is formed in one end, far away from the step, of the assembly shaft section (11), the pin shaft (34) is in interference fit with the mounting hole, and the mounting hole is formed in the circumferential surface of the assembly shaft section (11).
8. A differential gear connection structure as defined in claim 7, wherein: the number of the pin shafts (34) is at least 2, and the pin shafts (34) are uniformly arranged on the circumferential surface of the assembly shaft section (11).
9. A differential gear connection structure as defined in claim 1, wherein: the hole of driven gear is being kept away from the step one side and is being provided with the chamfer, the assembly shaft section is kept away from step one end and is formed and chamfer phase-match with keeping away from its axis direction slope is that the inclined plane butt forms the dog on the chamfer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910954633.9A CN111022607A (en) | 2019-10-09 | 2019-10-09 | Differential gear connecting structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910954633.9A CN111022607A (en) | 2019-10-09 | 2019-10-09 | Differential gear connecting structure |
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| Publication Number | Publication Date |
|---|---|
| CN111022607A true CN111022607A (en) | 2020-04-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910954633.9A Pending CN111022607A (en) | 2019-10-09 | 2019-10-09 | Differential gear connecting structure |
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| CN (1) | CN111022607A (en) |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0647789A1 (en) * | 1993-10-12 | 1995-04-12 | Société Anonyme dite: REGIE NATIONALE DES USINES RENAULT | Differential casing |
| FR2805482A1 (en) * | 2000-02-25 | 2001-08-31 | Renault | Crown wheel and case for motor vehicle differential has mating splines on inner surface of gar ring and outer surface of casing |
| KR20050011130A (en) * | 2003-07-22 | 2005-01-29 | 현대자동차주식회사 | Differential gear |
| KR20110040482A (en) * | 2009-10-14 | 2011-04-20 | 현대위아 주식회사 | Differential apparatus for automobile |
| CN202451611U (en) * | 2012-01-16 | 2012-09-26 | 浙江吉利汽车研究院有限公司 | Limiting mechanism of automobile transmission bearing |
| CN103003132A (en) * | 2011-07-04 | 2013-03-27 | 日本精工株式会社 | Bearing affixation structure and steering gear unit using bearing affixation structure |
| CN103380316A (en) * | 2011-06-29 | 2013-10-30 | 丰田自动车株式会社 | Press-fit structure and press-fit method |
| CN205155115U (en) * | 2015-12-04 | 2016-04-13 | 四川柳河齿轮有限公司 | Excavator walking motor reducer's planet shaft fastening device |
| CN105983641A (en) * | 2015-03-17 | 2016-10-05 | 丰田自动车株式会社 | Method of attaching ring gear to differential case, jig, and differential case |
| CN109578554A (en) * | 2018-12-19 | 2019-04-05 | 芜湖世特瑞转向***有限公司 | Reducer output shaft anti-backlash mechanism and electric boosting steering system retarder |
| CN210661266U (en) * | 2019-10-09 | 2020-06-02 | 重庆神箭汽车传动件有限责任公司 | Differential gear connecting structure |
-
2019
- 2019-10-09 CN CN201910954633.9A patent/CN111022607A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0647789A1 (en) * | 1993-10-12 | 1995-04-12 | Société Anonyme dite: REGIE NATIONALE DES USINES RENAULT | Differential casing |
| FR2805482A1 (en) * | 2000-02-25 | 2001-08-31 | Renault | Crown wheel and case for motor vehicle differential has mating splines on inner surface of gar ring and outer surface of casing |
| KR20050011130A (en) * | 2003-07-22 | 2005-01-29 | 현대자동차주식회사 | Differential gear |
| KR20110040482A (en) * | 2009-10-14 | 2011-04-20 | 현대위아 주식회사 | Differential apparatus for automobile |
| CN103380316A (en) * | 2011-06-29 | 2013-10-30 | 丰田自动车株式会社 | Press-fit structure and press-fit method |
| CN103003132A (en) * | 2011-07-04 | 2013-03-27 | 日本精工株式会社 | Bearing affixation structure and steering gear unit using bearing affixation structure |
| CN202451611U (en) * | 2012-01-16 | 2012-09-26 | 浙江吉利汽车研究院有限公司 | Limiting mechanism of automobile transmission bearing |
| CN105983641A (en) * | 2015-03-17 | 2016-10-05 | 丰田自动车株式会社 | Method of attaching ring gear to differential case, jig, and differential case |
| CN205155115U (en) * | 2015-12-04 | 2016-04-13 | 四川柳河齿轮有限公司 | Excavator walking motor reducer's planet shaft fastening device |
| CN109578554A (en) * | 2018-12-19 | 2019-04-05 | 芜湖世特瑞转向***有限公司 | Reducer output shaft anti-backlash mechanism and electric boosting steering system retarder |
| CN210661266U (en) * | 2019-10-09 | 2020-06-02 | 重庆神箭汽车传动件有限责任公司 | Differential gear connecting structure |
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Application publication date: 20200417 |