CN112128354B - Oil seal structure of gearbox shaft hole - Google Patents
Oil seal structure of gearbox shaft hole Download PDFInfo
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- CN112128354B CN112128354B CN202010979942.4A CN202010979942A CN112128354B CN 112128354 B CN112128354 B CN 112128354B CN 202010979942 A CN202010979942 A CN 202010979942A CN 112128354 B CN112128354 B CN 112128354B
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- oil seal
- hole
- groove
- shaft hole
- oil
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
- F16H57/029—Gearboxes; Mounting gearing therein characterised by means for sealing the gearboxes, e.g. to improve airtightness
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
- F16H57/021—Shaft support structures, e.g. partition walls, bearing eyes, casing walls or covers with bearings
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
Abstract
The invention discloses an oil seal structure of a shaft hole of a gearbox, which comprises a shaft hole, wherein an oil seal hole is arranged in the shaft hole, a pressure inlet is arranged above the oil seal hole, the diameter of the oil seal hole is smaller than that of the pressure inlet, and a chamfer ring is arranged between the pressure inlet and the oil seal hole; a plurality of grooves are formed in the oil seal hole, the grooves are arranged along the inner peripheral side of the oil seal hole in a circumferential array mode, and one ends of the grooves extend to the lower end face of the oil seal hole; the invention can press the oil seal ring into the oil seal space only by small pressure, and the invention does not affect the whole sealing performance of the oil seal ring and is not easy to cause the falling of the oil seal ring and the oil seal hole due to too loose matching.
Description
Technical Field
The invention relates to the field of gearbox oil seal structures, in particular to an oil seal structure of a gearbox shaft hole.
Background
In the automobile transmission, various problems exist at present in the matching between an oil seal and a shell, and the common main problems are that: trimming when the oil seal is pressed, so that oil leakage is caused; after the gearbox runs for a long time, the oil seal is axially displaced and even falls off. The former is because the cooperation of oil blanket and casing is too tight, strikes the pressure equipment oil blanket and needs great instantaneous pressure equipment power, and the sharp limit of oil blanket and oil blanket hole takes place violent friction and leads to, and the latter is because the cooperation of oil blanket and casing is too loose and leads to.
In the prior art, a balance point is usually measured for the interference fit between the oil seal and the housing, but due to manufacturing tolerances of both parts, it is often difficult to find the optimal fit. In order to realize better matching between the oil seal and the shell, the conventional means in the field is (1) selecting larger interference to avoid the movement of the oil seal, and simultaneously using lubricating grease or using the oil seal with a coating during assembly so as to reduce the assembly pressure of the oil seal; (2) the inner peripheral side of the oil seal hole is provided with an annular anti-drop groove to prevent the axial movement of the oil seal.
The above-mentioned prior art scheme has solved the problem of oil blanket oil leak and axial displacement to a certain extent, but has following defect:
1) due to manufacturing tolerances of the components, it is difficult to find a balance point for a too loose or too tight fit;
2) the use of coated oil seals is costly;
3) lubrication with grease prior to assembly of the oil seal can introduce impurities into the mating surfaces or the interior of the transmission and can affect manufacturing tact.
4) The annular anti-drop grooves are formed in the inner peripheral sides of the oil seal holes, additional machining needs to be performed on the oil seal holes, and production cost is increased.
Disclosure of Invention
The invention aims to solve the problems in the prior art, provides an oil seal structure of a shaft hole of a gearbox, solves the problem that an oil seal is damaged due to overlarge pressure in the oil seal assembling process, and also avoids the increase of production links and production time due to the adoption of lubricating grease for pre-lubrication and the arrangement of an annular anti-slip groove in the press fitting process.
In order to achieve the purpose, the invention adopts the technical scheme that:
an oil seal structure of a shaft hole of a gearbox comprises the shaft hole, wherein an oil seal hole is arranged in the shaft hole, an integrally formed press-in opening is arranged above the oil seal hole, the diameter of the oil seal hole is smaller than that of the press-in opening, and a circle of chamfering ring is arranged between the press-in opening and the oil seal hole; the oil seal hole is internally provided with a plurality of grooves which are arranged along the inner circumference of the oil seal hole in an array manner, and one end of each groove extends to the lower end face of the oil seal hole.
In the scheme, the oil seal ring matched with the oil seal hole in a smaller interference range is selected, so that the pressure when the oil seal ring is pressed into the oil seal hole is reduced to a certain extent, and the problem that the oil seal ring is easy to cut edges in the pressing process due to the fact that the oil seal ring and the oil seal hole have larger interference range and need larger press-fitting force in the prior art is avoided; meanwhile, in the process of pressing the oil seal ring into the oil seal hole, part of oil seal material of the oil seal ring still is in interference fit with the oil seal hole to ensure the performance of the oil seal, and the other part of oil seal material (rubber and/or metal framework) of the oil seal ring is in contact with the groove of the oil seal hole to deform and fill the groove of the oil seal hole.
Further, the groove is an inverted V-shaped groove and comprises a first inclined side surface and a second inclined side surface; the size of the included angle between the first inclined side face and the second inclined side face is 30 degrees, and the lengths of the first inclined side face and the second inclined side face are equal.
In the scheme, the size of the V-shaped groove and the pressing-in depth of the oil seal ring are given by field actual experience, and the feasibility is verified through tests; in addition, the V-arrangement groove is formed through a casting mode, the oil seal hole of the gearbox is formed through casting, the lower end of the V-arrangement groove is communicated with the lower end face of the oil seal hole, the V-arrangement groove can be integrally formed with the gearbox, cost is not increased basically, an anti-dropping oil seal ring groove is formed in the inner side of the oil seal hole in the prior art, extra machining is needed, and cost is high.
Further, the number of the grooves is 8. Because the recess lets the effect that the oil blanket ring stopped taking off, consequently the recess sets up more, and then the effect that stops taking off is more obvious, nevertheless sets up too much recess and can reduce oil blanket performance, consequently, through on-the-spot actual verification, when the quantity of recess is individual, the effect of stopping taking off is obvious, and oil blanket performance is better.
Further, the depth of the groove is 1.5 mm. When the groove is too shallow, the oil seal material (rubber and/or metal framework) of the oil seal ring deforms but is not fully filled into the groove, and the anti-falling performance of the groove is affected.
Furthermore, the oil seal ring is of a half-coating exposed framework structure or a full-coating structure.
Further, the diameter of the oil seal hole is 51 mm, the height of the oil seal hole is 10 mm, the length of the first inclined side face or the second inclined side face is 7.1 mm, the included angle between the first inclined side face and the second inclined side face is 60 degrees, the area of the cross section of the V-shaped groove is 21.8 square mm, and the area of the inner peripheral side of the oil seal hole is 1601.4 square mm.
The number of the grooves is 10, the area occupying the inner periphery of the oil seal hole is 218 square millimeters, the occupation ratio is 13.6%, the oil pressure of 0.04MPa can be borne to the maximum extent, and the ratio of the area of the grooves to the area of the inner periphery of the oil seal hole is verified to be less than 15%, so that the performance of the oil seal is not affected.
When the depth of the groove is 2 mm, the oil seal material (rubber and/or metal framework) of the oil seal ring is filled into the groove to the deepest extent, and at the moment, the bottom of the groove and the oil seal material (rubber and/or metal framework) filled into the groove are in a state of being just separated.
Furthermore, a rubber bump matched with the groove is arranged on the outer peripheral side of the oil seal ring of the full-coating structure. Through set up rubber lug at the periphery side of oil seal ring, make rubber lug sink into the recess, with the recess cooperation, make more stable interference fit of oil seal ring and oil seal hole, be difficult to drop and rotate.
Furthermore, the cross section of the groove is an oblique rectangle, the groove comprises a third oblique side face and a fourth oblique side face which are arranged in parallel, and the included angle between the third oblique side face or the fourth oblique side face and the lower end face of the oil sealing hole is 120-135 degrees.
The recess still includes the tank bottom surface, the tank bottom surface with the distance of the interior week side of oil blanket hole is crescent from left to right, the tank bottom surface is located one side of third slope side with the distance of the interior week side of oil blanket hole is zero.
In the above scheme, when the oil seal ring is located in the oil seal hole, the oil seal material (rubber and/or metal skeleton) of the oil seal ring is partially sunk into the groove, when the oil seal ring is subjected to an upward axial force, the oil seal material (rubber and/or metal skeleton) sunk into the groove applies an upward pressure to the fourth oblique side surface, but since the fourth oblique side surface has an included angle with the lower end surface of the oil seal hole, the fourth oblique side surface is actually subjected to a horizontal component of pressure, and since the fourth oblique side surface is far away from the third oblique side surface, the distance between the side of the groove bottom surface located on the fourth oblique side surface and the inner circumferential side of the oil seal hole is relatively large, the contact area between the oil seal material (rubber and/or metal skeleton) and the fourth oblique side surface is also large, so that the fourth oblique side surface provides a large friction force for the oil seal material (rubber and/or metal skeleton), the oil seal ring can be effectively prevented from dropping out of the oil seal hole.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, the oil seal ring which is matched with the oil seal hole in a smaller interference range is selected, and a part of oil seal material of the oil seal ring is contacted with the groove of the oil seal hole and is filled into the groove of the oil seal hole, so that the pressure when the oil seal ring is pressed into the oil seal hole is reduced, the sealing performance of the oil seal ring is not influenced, and the oil seal ring and the oil seal hole are not easy to fall off due to too loose matching.
2. The grooves in the oil seal holes can be formed by casting, and compared with the traditional oil seal hole design, the cost is basically not increased.
3. The oil seal hole is suitable for oil seals with half-pack and full-pack structures.
Drawings
FIG. 1 is a schematic view showing a structure of a shaft hole of an oil seal structure of a transmission shaft hole according to embodiment 1 of the present invention;
FIG. 2 is a schematic view of a fitting structure of the shaft hole and the seal ring according to embodiment 1 of the present invention;
FIG. 3 is a schematic view showing a fitting structure of a shaft hole and a seal ring according to embodiment 1 of the present invention;
FIG. 4 is a sectional view of a shaft hole in embodiment 1 of the present invention;
FIG. 5 is a cross section of a fully-enclosed oil seal structure according to embodiment 1 of the present invention;
fig. 6 is an expanded view of the inner peripheral side surface of the oil sealing hole of embodiment 1 of the present invention;
fig. 7 is an expanded view of the inner peripheral side surface of the oil sealing hole of embodiment 2 of the present invention;
FIG. 8 is a cross-sectional view taken along line A-A of FIG. 7 in accordance with the present invention;
in the figure; 1. a shaft hole; 2. a pressure inlet; 3. sealing the oil hole; 4. chamfering rings; 5. a groove; 501. a first inclined side surface; 502. A second oblique side; 503. a third oblique side surface; 504. a fourth sloped side; 505. the bottom surface of the groove; 6. an oil seal ring; 601. and a rubber bump.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, not all 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.
Example 1
In order to clearly show the structure of the shaft hole and the matching relationship between the oil seal ring and the oil seal hole, part of the gap is cut off in the shaft hole and the oil seal ring in fig. 1 to 4.
As shown in fig. 1 to 6, an oil seal structure of a shaft hole of a transmission includes a shaft hole 1, an oil seal hole 3 is arranged in the shaft hole 1, an integrally formed press-in opening 2 is arranged above the oil seal hole 3, the diameter of the oil seal hole 3 is smaller than that of the press-in opening 2, and a circle of chamfer ring 4 is arranged between the press-in opening 2 and the oil seal hole 3; a plurality of grooves 5 are formed in the oil seal hole 3, the grooves 5 are arranged along the inner circumference of the oil seal hole 3 in an array mode, and one end of each groove 5 extends to the lower end face of the oil seal hole 3.
In the scheme, the oil seal ring 6 which is matched with the oil seal hole 3 in a smaller interference fit mode is selected, so that the pressure when the oil seal ring 6 is pressed into the oil seal hole 3 is reduced to a certain extent, and the problem that in the prior art, the oil seal ring 6 is easy to cut edges in the pressing process due to the fact that the oil seal ring 6 and the oil seal hole 3 need larger press-fitting force due to the fact that the oil seal ring 6 and the oil seal hole 3 have larger interference is avoided; meanwhile, in the process of pressing the oil seal ring 6 into the oil seal hole 3, part of the oil seal material of the oil seal ring 6 is still in interference fit with the oil seal hole 3 to ensure the performance of the oil seal, and the other part of the oil seal material (rubber and/or metal framework) of the oil seal ring 6 is in contact with the groove 5 of the oil seal hole 3 to deform and fill the groove 5 of the oil seal hole 3, so that when the oil seal ring 6 is subjected to an axial force, the groove 5 of the oil seal hole 3 blocks the oil seal material (rubber and/or metal framework) filled therein, and the oil seal ring 6 is not easy to fall out of the oil seal hole 3, therefore, although the interference fit between the selected oil seal ring 6 and the oil seal hole 3 is small, the sealing performance of the oil seal ring 6 is not affected, and the oil seal ring 6 and the oil seal hole 3 are not easy to fall off due to too loose fit.
Further, the groove 5 is an inverted V-shaped groove, and the groove 5 includes a first inclined side 501 and a second inclined side 502; the included angle between the first inclined side surface 501 and the second inclined side surface 502 is 30 degrees, and the lengths of the first inclined side surface 501 and the second inclined side surface 502 are equal.
In the scheme, the size of the V-shaped groove and the pressing depth of the oil seal ring 6 are given by field practical experience, and the feasibility is verified through tests; in addition, the V-arrangement groove is formed through a casting mode, the oil seal hole of the gearbox is formed through casting, the lower end of the V-arrangement groove is communicated with the lower end face of the oil seal hole, the V-arrangement groove can be integrally formed with the gearbox, cost is not increased basically, an anti-dropping oil seal ring groove is formed in the inner side of the oil seal hole in the prior art, extra machining is needed, and cost is high.
Further, the number of the grooves 5 is 8. Because recess 5 lets the effect of 6 check-out of oil seal ring, consequently more that recess 5 set up, then the effect of check-out is more obvious, but sets up too much recess and can reduce the oil blanket performance, consequently, through on-the-spot actual verification, when the quantity of recess 5 is 8, the check-out effect is obvious, and the oil blanket performance is better.
Further, the depth of the groove 5 is 1.5 mm. When the groove 5 is too shallow, the oil seal material (rubber and/or metal skeleton) of the oil seal ring 6 is deformed but not fully filled in the groove 5, which affects the anti-falling performance of the groove 5.
Further, the oil seal ring 6 is of a half-coating exposed framework structure or a full-coating structure.
Example 2
The difference between this embodiment and embodiment 1 is that the diameter of the oil sealing hole 3 is 51 mm, the height of the oil sealing hole 3 is 10 mm, the length of the first inclined side surface 501 or the second inclined side surface 502 is 7.1 mm, the included angle between the first inclined side surface 501 and the second inclined side surface 502 is 60 degrees, the area of the cross section of the V-shaped groove is 21.8 square mm, and the area of the inner peripheral side of the oil sealing hole 3 is 1601.4 square mm.
The number of the grooves 5 is 10, the area occupying the inner peripheral side of the oil seal hole 3 is 218 square millimeters, the occupation ratio is 13.6%, the oil pressure of 0.04MPa can be borne to the maximum extent, and the ratio of the area of the grooves 5 to the area of the inner peripheral side of the oil seal hole 3 is verified to be less than 15%, and the performance of the oil seal is not affected.
When the depth of the groove 5 is 2 mm, the oil seal material (rubber and/or metal framework) of the oil seal ring 3 is filled into the groove 5 to the deepest extent, and at the moment, the bottom of the groove 5 and the oil seal material (rubber and/or metal framework) filled in the groove are in a state of being just separated.
Example 3
As shown in fig. 5, the present embodiment is different from embodiment 1 in that the outer peripheral side of the oil seal ring 6 of the all-coated structure is provided with a rubber bump 601 matching with the groove 5. The rubber bump 601 is arranged on the outer peripheral side of the oil seal ring 6, so that the rubber bump 601 sinks into the groove 5 and is matched with the groove 5, the oil seal ring 6 and the oil seal hole 3 are in more stable interference fit, and the oil seal ring is not easy to fall off and rotate.
Example 4
As shown in fig. 7 to 8, the present embodiment is different from embodiment 1 in that the cross section of the groove 5 is an oblique rectangle, the groove 5 includes a third oblique side surface 503 and a fourth oblique side surface 504 which are arranged in parallel, and an included angle between the third oblique side surface 503 or the fourth oblique side surface 504 and the lower end surface of the oil sealing hole 3 is 120 degrees to 135 degrees.
The groove 5 further comprises a groove bottom surface 505, the distance between the groove bottom surface 505 and the inner periphery of the oil sealing hole 3 is gradually increased from left to right, and the groove bottom surface 505 is located on one side of the third inclined side surface 503 and the distance between the inner periphery of the oil sealing hole 3 is zero.
In the above scheme, when the oil seal ring 6 is located in the oil seal hole 3, the oil seal material (rubber and/or metal skeleton) of the oil seal ring 6 is partially sunk into the groove 5, when the oil seal ring 6 is subjected to an upward axial force, the oil seal material (rubber and/or metal skeleton) sunk into the groove 5 applies an upward pressure to the fourth inclined side 504, but since the fourth inclined side 504 forms an angle with the lower end face of the oil seal hole 3, the fourth inclined side 504 is actually subjected to a horizontal component of pressure, and since the fourth inclined side 504 is far away from the third inclined side 503, the distance between the side of the groove bottom 505 located on the fourth inclined side 504 and the inner peripheral side of the oil seal hole 3 is relatively large, so that the area of contact between the oil seal material (rubber and/or metal skeleton) and the fourth inclined side 504 is also large, and the fourth inclined side 504 provides a large friction force to the oil seal material (rubber and/or metal skeleton), the oil seal ring 6 can be effectively prevented from being removed from the oil seal hole 3.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. The oil seal structure of the shaft hole of the gearbox is characterized by comprising the shaft hole, wherein an oil seal hole is arranged in the shaft hole, a pressure inlet is arranged above the oil seal hole, the diameter of the oil seal hole is smaller than that of the pressure inlet, and a chamfer ring is arranged between the pressure inlet and the oil seal hole; a plurality of grooves are formed in the oil seal hole, the grooves are arranged along the inner peripheral side of the oil seal hole in a circumferential array mode, and one ends of the grooves extend to the lower end face of the oil seal hole;
the cross section of the groove is an oblique rectangle, the groove comprises a third oblique side face and a fourth oblique side face which are arranged in parallel, and the included angle between the third oblique side face or the fourth oblique side face and the lower end face of the oil seal hole is 120-135 degrees.
2. The oil seal structure of a transmission shaft hole according to claim 1, wherein the groove further includes a groove bottom surface, a distance between the groove bottom surface and an inner peripheral side of the oil seal hole increases gradually from left to right, and a distance between one side of the groove bottom surface located on the third inclined side surface and the inner peripheral side of the oil seal hole is zero.
3. The oil seal structure of the shaft hole of the gearbox is characterized by comprising the shaft hole, wherein an oil seal hole is arranged in the shaft hole, a pressure inlet is arranged above the oil seal hole, the diameter of the oil seal hole is smaller than that of the pressure inlet, and a chamfer ring is arranged between the pressure inlet and the oil seal hole; a plurality of grooves are formed in the oil seal hole, the grooves are arranged along the inner peripheral side of the oil seal hole in a circumferential array mode, and one ends of the grooves extend to the lower end face of the oil seal hole; the groove is an inverted V-shaped groove and comprises a first inclined side face and a second inclined side face.
4. The oil seal structure of the shaft hole of the gearbox as claimed in claim 3, wherein the included angle between the first inclined side surface and the second inclined side surface is 30 degrees to 60 degrees, and the length of the first inclined side surface is equal to that of the second inclined side surface.
5. An oil seal structure of a transmission shaft hole according to claim 3, wherein the number of said grooves is 8 to 10.
6. An oil seal structure of a transmission shaft hole according to claim 1 or 3, wherein the depth of said groove is at least 1.5 mm.
7. The oil seal structure of the shaft hole of the gearbox as claimed in any one of claims 1 to 5, comprising an oil seal ring, wherein the oil seal ring is of a half-coating exposed framework structure or a full-coating structure.
8. An oil seal structure for a shaft hole of a transmission according to claim 7, wherein an outer peripheral side of the oil seal ring of the full cladding structure is provided with a rubber projection matching the groove.
9. The oil seal structure of the shaft hole of the gearbox according to claim 1 or 3, wherein the groove and the shaft hole are integrally formed, and the groove and the shaft hole are both formed by casting.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010979942.4A CN112128354B (en) | 2020-09-17 | 2020-09-17 | Oil seal structure of gearbox shaft hole |
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| CN202010979942.4A CN112128354B (en) | 2020-09-17 | 2020-09-17 | Oil seal structure of gearbox shaft hole |
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| CN112128354A CN112128354A (en) | 2020-12-25 |
| CN112128354B true CN112128354B (en) | 2022-08-30 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN207554790U (en) * | 2017-10-31 | 2018-06-29 | 潍柴动力股份有限公司 | A kind of oil sealing |
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| CN200965017Y (en) * | 2006-11-14 | 2007-10-24 | 万向钱潮股份有限公司 | Oil seal structure gimbal |
| JP4293263B2 (en) * | 2007-04-19 | 2009-07-08 | トヨタ自動車株式会社 | Power transmission device for vehicle |
| CN103307187B (en) * | 2013-06-27 | 2015-05-13 | 富奥汽车零部件股份有限公司 | Vibration damper sealing structure |
| JP6333872B2 (en) * | 2016-03-03 | 2018-05-30 | 本田技研工業株式会社 | Vehicle seal ring |
| CN109357016A (en) * | 2018-09-28 | 2019-02-19 | 重庆春阳密封制品有限公司 | Dust-proof grease proofing combination oil seal |
| CN209943483U (en) * | 2019-04-29 | 2020-01-14 | 高科橡塑工业有限公司 | Split type sealing device for speed reducer output shaft |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN207554790U (en) * | 2017-10-31 | 2018-06-29 | 潍柴动力股份有限公司 | A kind of oil sealing |
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Effective date of registration: 20230506 Address after: 430000 No. 339 Zhuanyang Avenue, Wuhan Economic and Technological Development Zone, Hubei Province Patentee after: Zhixin Technology Co.,Ltd. Address before: 239 houguanhu Avenue, Wuhan Economic and Technological Development Zone, 430056 Patentee before: DONGFENG GETRAG TRANSMISSION CO.,LTD. |