CN112298339A - Steering engine rack clearance compensation mechanism, steering engine and vehicle - Google Patents
Steering engine rack clearance compensation mechanism, steering engine and vehicle Download PDFInfo
- Publication number
- CN112298339A CN112298339A CN201910697764.3A CN201910697764A CN112298339A CN 112298339 A CN112298339 A CN 112298339A CN 201910697764 A CN201910697764 A CN 201910697764A CN 112298339 A CN112298339 A CN 112298339A
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- Prior art keywords
- rack
- groove
- steering
- compensation mechanism
- supporting seat
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- 238000007789 sealing Methods 0.000 claims description 10
- 229910001285 shape-memory alloy Inorganic materials 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 7
- 238000005381 potential energy Methods 0.000 description 5
- 230000002159 abnormal effect Effects 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 230000036316 preload Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D3/00—Steering gears
- B62D3/02—Steering gears mechanical
- B62D3/12—Steering gears mechanical of rack-and-pinion type
- B62D3/126—Steering gears mechanical of rack-and-pinion type characterised by the rack
-
- 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
- F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
- F16H55/02—Toothed members; Worms
- F16H55/26—Racks
- F16H55/28—Special devices for taking up backlash
-
- 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
- F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
- F16H55/02—Toothed members; Worms
- F16H55/26—Racks
- F16H55/28—Special devices for taking up backlash
- F16H2055/281—Cylindrical or half-cylindrical bushings around the rack, e.g. using special wedges to reduce play
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Transmission Devices (AREA)
Abstract
The present invention relates to a steering gear rack backlash compensation mechanism that is provided in a steering gear housing and includes: a support seat, the bottom end of which abuts against the rack and the top end of which abuts against a plug screw fixed to a steering gear housing, and the support seat being provided with a bottom end groove at the bottom end and a top end groove at the top end; the supporting seat base is arranged in the bottom end groove, and one end of the supporting seat base abuts against the rack; the first elastic piece is arranged in the bottom groove and connected between the other end, which is opposite to one end of the support base and is abutted against the rack, and the bottom of the bottom groove; and the second elastic piece is arranged in the top end groove and connected between the bottom of the top end groove and the screw plug. Therefore, the steering machine rack clearance compensation mechanism provided by the embodiment of the invention can solve the problems that the compensation effect is gradually reduced and the rack clearance of the steering machine is increasingly increased after the steering machine works for a long time, can reduce noise and improve the comfort of a driver when driving a vehicle.
Description
Technical Field
The invention relates to the technical field of vehicle steering machines, in particular to a steering machine clearance compensation mechanism, a steering machine and a vehicle.
Background
When a driver operates a steering wheel, the steering engine helps the driver to reduce the effort during steering, and the purpose of easily and conveniently driving a vehicle is achieved.
The steering engine has the working principle that when a driver applies torque to a steering wheel, the torque is transmitted to a steering engine gear through a steering column and applies acting force to a steering engine rack meshed with the steering engine gear, so that the steering engine rack makes linear motion and drives a steering pull rod, and finally, a wheel hub is driven by the pull rod to rotate, so that the deflection motion of a tire is realized.
However, a rack gap is generally generated due to influences such as actual machining accuracy, assembly, and wear after a long time use. Conventionally, a rack clearance compensation mechanism is provided in a steering gear so that a rack clearance of the steering gear can be adjusted.
As shown in fig. 1, a conventional steering rack backlash compensation mechanism is mounted on a steering housing 10, and a coil spring 6 is provided at one end of a support base 8 for providing a preload force. The other end of the spiral spring 6 is connected with the screw plug 5, and when the locking nut 4 arranged at the tail end of the screw plug 5 is screwed, the gap between the teeth of the steering engine is fixed; when the lock nut 4 is loosened and the plug screw 5 is adjusted, the plug screw 5 compresses the coil spring 6, and the coil spring 6 presses the rack 1 through the support base 8 to realize the compensation of the rack clearance.
However, after the existing steering gear rack clearance compensation mechanism with pretightening force provided by a single spiral spring works for a long time, the compensation effect is gradually reduced, the rack clearance of the steering gear is increased more and more, and then abnormal sound is generated, so that not only the performance of the steering gear is influenced, but also the comfort of a driver when the driver drives a vehicle is influenced.
Disclosure of Invention
Technical problem to be solved
The invention aims to provide a rack clearance compensation mechanism of a steering engine, which aims to solve the problems that the clearance compensation effect of the existing rack clearance compensation mechanism of the steering engine is not ideal, and the rack clearance is increasingly increased, so that abnormal sound is generated.
Another object of the present invention is to provide a steering gear and a vehicle including the above steering gear rack clearance compensation mechanism, so as to solve the problems that the conventional steering gear rack clearance compensation mechanism has an undesirable clearance compensation effect, and the rack clearance is increased more and more, thereby generating abnormal noise.
(II) technical scheme
In order to solve the above technical problem, in one aspect, the present invention provides a steering gear rack backlash compensation mechanism provided in a steering gear housing, the steering gear rack backlash compensation mechanism including: a support seat, the bottom end of which abuts against the rack and the top end of which abuts against a plug screw fixed to a steering gear housing, and the support seat being provided with a bottom end groove at the bottom end and a top end groove at the top end; the supporting seat base is arranged in the bottom end groove, and one end of the supporting seat base abuts against the rack; the first elastic piece is arranged in the bottom groove and connected between the other end, which is opposite to one end of the support base and is abutted against the rack, and the bottom of the bottom groove; and the second elastic piece is arranged in the top end groove and connected between the bottom of the top end groove and the screw plug.
Optionally, the bottom end groove comprises a first groove and a second groove which are communicated with each other, and the second groove is formed by extending inwards from the bottom of the first groove; the supporting seat base is arranged in the first groove and the first elastic piece is arranged in the second groove.
Optionally, the width of the first groove is greater than the width of the second groove, and the depth of the first groove is less than the depth of the second groove.
Optionally, the base of the support seat is made of memory alloy.
Optionally, the bottom surface of the support seat against the rack and the bottom surface of the support seat base against the rack each have a curved surface corresponding to the outer surface of the rack.
Optionally, the steering gear rack clearance compensation mechanism further comprises a sealing ring, and the sealing ring is arranged between the inner surface of the steering gear shell and the outer surface of the supporting seat.
Optionally, the steering gear rack lash compensation mechanism comprises at least 2 sealing rings.
Optionally, a lock nut is provided on the exterior of the plug screw to cooperate with tightening the plug screw.
In another aspect, the invention further provides a steering engine, which comprises the steering engine rack clearance compensation mechanism.
In still another aspect, the invention further provides a vehicle comprising the steering rack backlash compensation mechanism.
(III) advantageous effects
Compared with the prior art, the invention has the following advantages: the invention provides a steering gear rack clearance compensation mechanism, which is arranged in a steering gear shell, and comprises: a support seat, the bottom end of which abuts against the rack and the top end of which abuts against a plug screw fixed to a steering gear housing, and the support seat being provided with a bottom end groove at the bottom end and a top end groove at the top end; the supporting seat base is arranged in the bottom end groove, and one end of the supporting seat base abuts against the rack; the first elastic piece is arranged in the bottom groove and connected between the other end, which is opposite to one end of the support base and is abutted against the rack, and the bottom of the bottom groove; and the second elastic piece is arranged in the top end groove and connected between the bottom of the top end groove and the screw plug. Therefore, the steering machine rack clearance compensation mechanism provided by the embodiment of the invention can solve the problems that the compensation effect is gradually reduced and the rack clearance of the steering machine is increasingly increased after the steering machine works for a long time, can reduce noise and improve the comfort of a driver when driving a vehicle.
Drawings
The above and other objects, features and other advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:
fig. 1 is a schematic view showing the structure of a rack backlash compensation mechanism of a steering gear according to the prior art;
fig. 2 is a schematic structural view showing a rack backlash compensation mechanism of a steering gear according to an embodiment of the present invention.
In the figure: 1: a rack; 2: a support base; 3: a seal ring; 4: locking the nut; 5: a plug screw; 6: a coil spring; 7: a first elastic member; 8: a second elastic member; 9: a supporting seat; 10: a steering housing; 11: a gear shaft.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should 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 invention can be understood as appropriate by those of ordinary skill in the art.
In addition, in the description of the present invention, "a plurality", and "a plurality" mean two or more unless otherwise specified.
The present invention provides a rack backlash compensation mechanism for a steering gear, which is provided in a steering gear housing 10, and includes: a support seat 9 having a bottom end abutting against the rack 1 and a top end abutting against a plug screw 5 fixed to a steering housing 10, and the support seat 9 being provided with a bottom end groove at the bottom end and a top end groove at the top end; the supporting seat base 2 is arranged in the groove at the bottom end, and one end of the supporting seat base abuts against the rack 1; the first elastic piece 7 is arranged in the bottom end groove and connected between the other end opposite to one end, abutted against the rack 1, of the supporting seat base 2 and the bottom of the bottom end groove; and a second elastic member 8 disposed in the top end groove and connected between the bottom of the top end groove and the plug screw 5.
Specifically, as shown in fig. 2, the steering gear rack backlash compensation mechanism is provided in a steering gear housing 10, and a rack bar 1 and a pinion shaft 11 are included in the steering gear housing 10, and the rack bar 1 and the pinion shaft 11 are in meshing transmission with each other.
According to the embodiment of the present invention, the bottom end of the support seat 9 abuts against the rack bar 1, and the top end of the support seat 9 abuts against the plug screw 5 fixed on the steering housing 10, and both the bottom end surface of the support seat 9 abutting against the rack bar 1 and the bottom end surface of the support seat base 2 abutting against the rack bar 1 correspond to the curved surface of the outer surface of the rack bar 1. In addition, the supporting seat 9 according to the embodiment of the present invention is provided with a bottom groove at the bottom end and a top groove at the top end. The bottom end groove of the support seat 9 comprises a first groove and a second groove which are communicated with each other, the second groove extends inwards from the bottom of the first groove, the width of the first groove is larger than that of the second groove, and the depth of the first groove is smaller than that of the second groove. The supporting seat base 2 is arranged in the first groove, and the first elastic piece 7 is arranged in the second groove to release elastic potential energy, so that the supporting seat base 2 and the rack 1 abutting against the supporting seat base 2 are pushed to move towards the gear shaft 11, and a gap between the rack 1 and the gear shaft 11 is kept.
The supporting seat base 2 adopts memory alloy to make the supporting seat base 2 can carry out the deformation of different degree under different situation, and the supporting seat base 2 can also avoid the deformation of the supporting seat 9 bottom that the collision of 1 surface of rack and the curved surface of supporting seat 9 bottom leads to. In addition, the durable plating layer of the support base 2 needs to be thickened so that it can be durable under the pressure of the first elastic member 7, the support 9, and the rack 1.
Be provided with second elastic component 8 in the top recess of supporting seat 9, and second elastic component 8 is connected between the bottom of top recess and plug screw 5, uses when the steering gear leads to the working capability decline of first elastic component 7 for a long time, releases elastic potential energy through second elastic component 8 and promotes whole supporting seat 9, makes the rack 1 of connecting at supporting seat 9 remove to gear shaft 9.
The screw plug 5 connected with the second elastic member 8 is used for supporting the second elastic member 8, so that the second elastic member 8 can release elastic potential energy. The plug screw 5 is externally provided with a lock nut 4 to fittingly fasten the plug screw 5 to the steering housing 10. The screw plug 5 can be moved by screwing and unscrewing the lock nut 4, and the degree of compression of the second elastic member 8 can be adjusted, thereby adjusting the rack clearance of the steering gear.
In addition, the steering gear rack clearance compensation mechanism according to the embodiment of the invention further comprises a sealing ring, wherein the sealing ring is arranged between the inner surface of the steering gear shell 10 and the outer surface of the supporting seat 9 and used for stabilizing the supporting seat 9, so that the supporting seat 9 can not easily move when being impacted, the supporting seat 9 and the steering gear shell 10 are prevented from colliding to generate abrasion, and noise generated by collision can be prevented. Alternatively, at least 2 sealing rings 3 are used in order to be stable. In addition, a gasket is arranged between the supporting seat 9 and the screw plug 5 to play a role in sealing and fastening.
According to the steering gear rack clearance compensation mechanism provided by the embodiment of the invention, the positions of the plug screw 5, the second elastic piece 8, the supporting seat 9, the first elastic piece 7 and the supporting seat base 2 are fixed by screwing the lock nut 4, so that the rack clearance of the steering gear is fixed; in the earlier stage of the operation of the steering engine, because the compression amount of the first elastic part 7 is larger, the first elastic part 7 can release elastic potential energy to push the support to serve as the base 2 and the rack 1 to compensate the gap of the rack of the steering engine; after the steering engine is used for a long time, the working capacity of the first elastic part 7 is reduced, and the second elastic part 8 pushes the supporting seat 9, the supporting seat base 2 and the rack 1 by releasing elastic potential energy to keep the stability of the rack gap. Meanwhile, the support base 2 adopting the memory alloy also begins to deform, and the rack clearance of the steering engine is further compensated.
On the other hand, the invention also provides a steering engine, which comprises the steering engine rack clearance compensation mechanism, so that the noise can be reduced and the service life can be prolonged while the steering engine rack clearance is effectively compensated.
In still another aspect, the present invention further provides a vehicle including the steering gear rack clearance compensation mechanism, so as to reduce noise and prolong service life while effectively compensating for the steering gear rack clearance.
Compared with the prior art, the invention has the following advantages: the invention provides a steering gear rack clearance compensation mechanism, which is arranged in a steering gear shell, and comprises: a support seat, the bottom end of which abuts against the rack and the top end of which abuts against a plug screw fixed to a steering gear housing, and the support seat being provided with a bottom end groove at the bottom end and a top end groove at the top end; the supporting seat base is arranged in the bottom end groove, and one end of the supporting seat base abuts against the rack; the first elastic piece is arranged in the bottom groove and connected between the other end, which is opposite to one end of the support base and is abutted against the rack, and the bottom of the bottom groove; and the second elastic piece is arranged in the top end groove and connected between the bottom of the top end groove and the screw plug. Therefore, the steering machine rack clearance compensation mechanism provided by the embodiment of the invention can solve the problems that the compensation effect is gradually reduced and the rack clearance of the steering machine is increasingly increased after the steering machine works for a long time, can reduce noise and improve the comfort of a driver when driving a vehicle.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A steering gear rack clearance compensation mechanism is arranged in a steering gear shell, and is characterized in that: the steering gear rack clearance compensation mechanism comprises:
a support seat having a bottom end abutting against the rack and a top end abutting against a plug screw fixed to the steering housing, and provided with a bottom end groove at the bottom end and a top end groove at the top end;
the supporting seat base is arranged in the bottom end groove, and one end of the supporting seat base abuts against the rack;
the first elastic piece is arranged in the bottom end groove and connected between the other end, which is opposite to one end of the support seat base and abuts against the rack, and the bottom of the bottom end groove; and
and the second elastic piece is arranged in the top end groove and connected between the bottom of the top end groove and the screw plug.
2. The steering rack backlash compensation mechanism according to claim 1, wherein:
the bottom end groove comprises a first groove and a second groove which are communicated with each other, and the second groove is formed by extending inwards from the bottom of the first groove; the supporting seat base is arranged in the first groove and the first elastic piece is arranged in the second groove.
3. The steering rack backlash compensation mechanism according to claim 2, wherein:
the width of the first groove is greater than the width of the second groove, and the depth of the first groove is less than the depth of the second groove.
4. The steering rack backlash compensation mechanism according to claim 1, wherein:
the base of the supporting seat is made of memory alloy.
5. The steering rack backlash compensation mechanism according to claim 1, wherein:
the supporting seat supports against the bottom end surface of the rack and the supporting seat base supports against the bottom end surface of the rack, and curved surfaces corresponding to the outer surfaces of the racks are arranged on the supporting seat base.
6. The steering rack backlash compensation mechanism according to claim 1, wherein:
the steering gear rack clearance compensation mechanism further comprises a sealing ring, and the sealing ring is arranged between the inner surface of the steering gear shell and the outer surface of the supporting seat.
7. The steering rack backlash compensation mechanism according to claim 6, wherein:
the steering gear rack clearance compensation mechanism comprises at least 2 sealing rings.
8. The steering rack backlash compensation mechanism according to claim 1, wherein:
and a locking nut is arranged outside the screw plug to be matched and fastened with the screw plug.
9. A steering machine characterized by:
comprising a steering rack lash compensation mechanism according to any of claims 1-8.
10. A vehicle, characterized in that:
comprising a steering rack lash compensation mechanism according to any of claims 1-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910697764.3A CN112298339A (en) | 2019-07-30 | 2019-07-30 | Steering engine rack clearance compensation mechanism, steering engine and vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910697764.3A CN112298339A (en) | 2019-07-30 | 2019-07-30 | Steering engine rack clearance compensation mechanism, steering engine and vehicle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112298339A true CN112298339A (en) | 2021-02-02 |
Family
ID=74485713
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910697764.3A Withdrawn CN112298339A (en) | 2019-07-30 | 2019-07-30 | Steering engine rack clearance compensation mechanism, steering engine and vehicle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112298339A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11345393B1 (en) * | 2021-12-08 | 2022-05-31 | Super ATV, LLC | Dual bushing steering rack |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3950006A (en) * | 1972-09-11 | 1976-04-13 | Trw Inc. | Rack and pinion steering assembly |
| JP2003291808A (en) * | 2002-04-08 | 2003-10-15 | Nippon Sharyo Seizo Kaisha Ltd | Journal box support device for railroad rolling stock |
| CN101032977A (en) * | 2006-03-08 | 2007-09-12 | 株式会社万都 | Apparatus for automatically compensating for clearance of support yoke in rack-and-pinion steering system |
| JP2008049756A (en) * | 2006-08-23 | 2008-03-06 | Nsk Ltd | Rack/pinion type steering device |
| CN101698417A (en) * | 2009-09-25 | 2010-04-28 | 荆州恒隆汽车零部件制造有限公司 | Steering mechanism capable of improving friction performance and abnormal sound |
| JP2013086528A (en) * | 2011-10-13 | 2013-05-13 | Nsk Ltd | Rack and pinion type steering device |
| CN103889822A (en) * | 2011-10-28 | 2014-06-25 | 韩国德尔福汽车系统公司 | Rack bar support device of a steering gear |
| KR20160112849A (en) * | 2015-03-20 | 2016-09-28 | 현대자동차주식회사 | Rack support device for power steering system |
| CN109436084A (en) * | 2018-12-05 | 2019-03-08 | 贵州长江汽车有限公司 | A kind of automobile gear rack gear backlash of steering gear adjustment mechanism |
-
2019
- 2019-07-30 CN CN201910697764.3A patent/CN112298339A/en not_active Withdrawn
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3950006A (en) * | 1972-09-11 | 1976-04-13 | Trw Inc. | Rack and pinion steering assembly |
| JP2003291808A (en) * | 2002-04-08 | 2003-10-15 | Nippon Sharyo Seizo Kaisha Ltd | Journal box support device for railroad rolling stock |
| CN101032977A (en) * | 2006-03-08 | 2007-09-12 | 株式会社万都 | Apparatus for automatically compensating for clearance of support yoke in rack-and-pinion steering system |
| JP2008049756A (en) * | 2006-08-23 | 2008-03-06 | Nsk Ltd | Rack/pinion type steering device |
| CN101698417A (en) * | 2009-09-25 | 2010-04-28 | 荆州恒隆汽车零部件制造有限公司 | Steering mechanism capable of improving friction performance and abnormal sound |
| JP2013086528A (en) * | 2011-10-13 | 2013-05-13 | Nsk Ltd | Rack and pinion type steering device |
| CN103889822A (en) * | 2011-10-28 | 2014-06-25 | 韩国德尔福汽车系统公司 | Rack bar support device of a steering gear |
| KR20160112849A (en) * | 2015-03-20 | 2016-09-28 | 현대자동차주식회사 | Rack support device for power steering system |
| CN109436084A (en) * | 2018-12-05 | 2019-03-08 | 贵州长江汽车有限公司 | A kind of automobile gear rack gear backlash of steering gear adjustment mechanism |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11345393B1 (en) * | 2021-12-08 | 2022-05-31 | Super ATV, LLC | Dual bushing steering rack |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Address after: Gyeonggi Do, South Korea Applicant after: Hanna Wandu Co.,Ltd. Applicant after: MANDO CHINA HOLDINGS Ltd. Address before: Gyeonggi Do, South Korea Applicant before: MANDO Corp. Applicant before: MANDO CHINA HOLDINGS Ltd. |
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| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20210202 |