CN211139025U - Coaxial integrated electric drive axle assembly and vehicle with same - Google Patents
Coaxial integrated electric drive axle assembly and vehicle with same Download PDFInfo
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- CN211139025U CN211139025U CN201921810647.5U CN201921810647U CN211139025U CN 211139025 U CN211139025 U CN 211139025U CN 201921810647 U CN201921810647 U CN 201921810647U CN 211139025 U CN211139025 U CN 211139025U
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Abstract
The utility model belongs to the technical field of electric drive axle design, a coaxial integrated form electric drive axle assembly and have vehicle of this electric drive axle assembly is disclosed. In the coaxial integrated electric drive axle assembly, a drive motor and a speed reducer assembly are designed in a coaxial integrated mode, and a drive motor oil seal is arranged in the drive motor oil seal; the left support bearing of the driving motor is shared with the right bearing of the first-stage reduction driving cylindrical gear; an output shaft of the driving motor assembly and the first-stage speed reduction driving cylindrical gear are in spline fit for torque transmission, the second-stage speed reduction driving cylindrical gear is assembled with the first-stage speed reduction driven cylindrical gear through splines, and the second-stage speed reduction driven cylindrical gear and the differential mechanism assembly are assembled in the driving motor and speed reducer integrated shell. The utility model discloses an adopt drive motor casing and retarder housing integrated design, adopt two-stage roller gear transmission and compact differential mechanism, can effectively reduce assembly cost and weight, improve assembly transmission efficiency and assembly compactedness, be convenient for stopper and shock absorber are arranged, reduce the meshing noise.
Description
Technical Field
The utility model relates to an electric drive axle designs technical field, especially relates to a coaxial integrated form electric drive axle assembly and has vehicle of this electric drive axle assembly.
Background
The prior coaxial electric drive axle adopts two schemes of planet row transmission and cylindrical gear transmission, adopts a planet row speed reduction scheme, and has compact structure, low transmission efficiency and high cost; and the cylindrical gear transmission scheme is adopted, and the independent design scheme of a driving motor assembly and a speed reducer assembly is adopted, so that the structure is not compact enough. In the transmission scheme of the cylindrical gear in the prior art, or the right side of a first-stage speed reduction driven cylindrical gear is not supported by a bearing, so that the gear is not favorably meshed; or the primary speed reduction driving cylindrical gear adopts a cantilever support structure, so that micro deformation is easy to generate in the torque transmission process, and the two schemes can generate meshing noise during high-speed transmission.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a coaxial integrated form electric drive axle assembly and have vehicle of this electric drive axle assembly to solve current electric drive axle assembly compactedness and produce the problem of meshing noise easily.
To achieve the purpose, the utility model provides a coaxial integrated electric drive axle assembly, which comprises a drive motor and a reducer assembly, wherein the coaxial integrated design is adopted, and the drive motor is internally provided with an oil seal; the driving motor and speed reducer assembly comprises a driving motor assembly, a primary speed reduction driving cylindrical gear left bearing, a bearing seat, a primary speed reduction driven cylindrical gear, a secondary speed reduction driving cylindrical gear right bearing, a spacer bush, a speed reducer left shell, a secondary speed reduction driving cylindrical gear left bearing, a secondary speed reduction driven cylindrical gear and differential mechanism assembly, a driving motor and speed reducer integrated shell and a driving motor left support bearing; the left support bearing of the driving motor is shared with the right bearing of the primary speed reduction driving cylindrical gear; the output shaft of the driving motor assembly and the primary speed reduction driving cylindrical gear are in spline fit for torque transmission, and a left bearing of the primary speed reduction driving cylindrical gear and a left support bearing of the driving motor support two ends of a shaft of the primary speed reduction driving cylindrical gear; the second-stage reduction driving cylindrical gear is assembled with the first-stage reduction driven cylindrical gear through a spline, a spacer sleeve is arranged in the middle of the second-stage reduction driving cylindrical gear, two ends of the second-stage reduction driving cylindrical gear are supported through a right bearing of the second-stage reduction driving cylindrical gear and a left bearing of the second-stage reduction driving cylindrical gear, and the first-stage reduction driving cylindrical gear is meshed with the first-stage reduction driven cylindrical gear and transmits power; the bearing block is assembled on the drive motor and speed reducer integrated shell; the secondary speed reduction driven cylindrical gear and differential assembly is assembled in the driving motor and speed reducer integrated shell through a bearing, and the secondary speed reduction driving cylindrical gear is meshed with the secondary speed reduction driven cylindrical gear and transmits power; the speed reducer left shell is connected with the driving motor assembly through the driving motor and speed reducer integrated shell bolt, the pre-tightening of the two-shaft bearing is completed, the left half axle housing is connected with the speed reducer left shell through the bolt, and the pre-tightening of the one-shaft three-shaft bearing is completed.
Preferably, the driving motor and speed reducer assembly further comprises a two-axis adjusting shim, and the two-axis adjusting shim is arranged between the two-stage speed reduction driving cylindrical gear and the left shell of the speed reducer.
Preferably, the driving motor and speed reducer assembly further comprises a first shaft and third shaft adjusting shim, and the first shaft and third shaft adjusting shim is arranged between the second-stage speed reduction driven cylindrical gear and differential assembly and the speed reducer left shell.
Preferably, the coaxial integrated electric drive axle assembly further comprises a left half axle housing, a right half axle housing, a left wheel hub and brake drum assembly, a right wheel hub and brake drum assembly, a left half axle, a right half axle, a left brake assembly and a right brake assembly; the both sides of driving motor and reduction gear assembly are respectively through bolted connection left half axle housing and right half axle housing, and left wheel hub and brake drum assembly, right wheel hub and brake drum assembly symmetry respectively assemble in left half axle housing and right half axle housing outside end face, and left half axle and right half axle assemble respectively on left wheel hub and brake drum assembly and right wheel hub and brake drum assembly, and left brake assembly and right brake assembly assemble respectively on left half axle housing and right half axle housing.
Preferably, the first-stage reduction driving cylindrical gear left bearing is assembled in a bearing seat, and the first-stage reduction driving cylindrical gear left bearing, the second-stage reduction driven cylindrical gear and a differential right bearing in the differential assembly are axially positioned with each other through outer rings.
Preferably, reinforcing ribs are arranged on the upper and lower parts of the longitudinal centrosymmetric cross section of the left half-bridge shell and the right half-bridge shell.
The utility model also provides a vehicle, the vehicle has coaxial integrated form electric drive axle assembly.
The utility model has the advantages that:
the utility model provides a coaxial integrated form electric drive axle assembly through adopting driving motor casing and retarder housing integrated design, adopts two-stage roller gear transmission and compact differential mechanism, can effectively reduce assembly cost and weight, improves assembly transmission efficiency, improves the assembly compactedness, and stopper and shock absorber of being convenient for arrange, reduce the meshing noise.
Drawings
Fig. 1 is a schematic overall structure diagram of a coaxial integrated electric drive axle assembly according to an embodiment of the present invention;
fig. 2 is a schematic sectional view of a driving motor and a reducer assembly according to an embodiment of the present invention;
fig. 3 is a schematic sectional view of a driving motor assembly according to an embodiment of the present invention;
FIG. 4 is a schematic view of the connection between the bearing seat and the motor-reducer case in the embodiment of the present invention;
fig. 5 is a schematic structural diagram of a half axle housing in an embodiment of the present invention.
In the figure:
1. a drive motor and a reducer assembly; 2, a left half axle housing; 3, right half axle housing;
4. a left hub and brake drum assembly; a right hub and brake drum assembly; 6, a left half shaft;
7. a right half shaft; a left brake assembly; a right brake assembly;
10. reinforcing ribs;
1-1, driving a motor assembly; 1-2, a primary speed reduction driving cylindrical gear;
1-3, a first-stage speed reduction driving cylindrical gear left bearing; 1-4. bearing seat;
1-5, a first-stage speed reduction driven cylindrical gear; 1-6, a second-stage speed reduction driving cylindrical gear right bearing;
1-7, spacer bush; 1-8, a left shell of the reducer;
1-9, a two-stage speed reduction driving cylindrical gear; 1-10, a secondary speed reduction driving cylindrical gear left bearing;
1-11. a biaxial adjusting shim; 1-12, a secondary speed reduction driven cylindrical gear and a differential assembly;
1-13, adjusting the gasket in one shaft and three shafts; 1-14. a driving motor and a reducer integrated shell;
1-15. driving motor left support bearing.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As fig. 1, the utility model provides a coaxial integrated form electric drive axle assembly adopts the sectional type axle housing scheme, mainly includes driving motor and reduction gear assembly 1, left half axle housing 2, right half axle housing 3, left wheel hub and brake drum assembly 4, right wheel hub and brake drum assembly 5, left semi-axis 6, right semi-axis 7, left brake assembly 8, right brake assembly 9. The two sides of the driving motor and the speed reducer assembly 1 are respectively connected with the left half axle housing 2 and the right half axle housing 3 through bolts, the left wheel hub and brake drum assembly 4 and the right wheel hub and brake drum assembly 5 are respectively and symmetrically assembled on the outer end faces of the left half axle housing 2 and the right half axle housing 3, the left half axle 6 and the right half axle 7 are respectively assembled on the left wheel hub and brake drum assembly 4 and the right wheel hub and brake drum assembly 5, the left brake assembly 8 and the right brake assembly 9 are respectively assembled on the left half axle housing 2 and the right half axle housing 3, the driving motor transmits power to the left half axle 6 and the right half axle 7 through the speed reducer and the differential mechanism, and then transmits the power to the tire through the left wheel hub and the right wheel hub to drive the whole vehicle to.
The utility model discloses well driving motor and reduction gear assembly 1 adopts coaxial integrated form design, as fig. 2, driving motor and reduction gear assembly 1 mainly include driving motor assembly 1-1, one-level speed reduction initiative cylindrical gear 1-2, one-level speed reduction initiative cylindrical gear left bearing 1-3, bearing frame 1-4, one-level speed reduction driven cylindrical gear 1-5, second grade speed reduction initiative cylindrical gear right bearing 1-6, spacer 1-7, reduction gear left shell 1-8, second grade speed reduction initiative cylindrical gear 1-9, second grade speed reduction initiative cylindrical gear left bearing 1-10, two-axis adjusting shim 1-11, second grade speed reduction driven cylindrical gear and differential mechanism assembly 1-12, one-axis triaxial adjusting shim 1-13, driving motor and reduction gear integration shell 1-14, The left support bearing 1-15 of the driving motor. A driving motor is internally arranged in an oil seal, and a left supporting bearing 1-15 of the driving motor is shared with a right bearing of a primary speed reduction driving cylindrical gear 1-2, namely the right bearing of the primary speed reduction driving cylindrical gear 1-2 is the left supporting bearing 1-15 of the driving motor. An output shaft of the driving motor assembly 1-1 and a primary speed reduction driving cylindrical gear 1-2 are in spline fit for torque transmission, and a primary speed reduction driving cylindrical gear left bearing 1-3 and a driving motor left support bearing support two ends of a shaft of the primary speed reduction driving cylindrical gear 1-2; the two-stage reduction driving cylindrical gear 1-9 is assembled with the one-stage reduction driven cylindrical gear 1-5 through a spline, a spacer sleeve 1-7 is arranged in the middle of the two-stage reduction driving cylindrical gear 1-9, two ends of the two-stage reduction driving cylindrical gear are supported through a two-stage reduction driving cylindrical gear right bearing 1-6 and a two-stage reduction driving cylindrical gear left bearing 1-10, and the one-stage reduction driving cylindrical gear 1-2 and the one-stage reduction driven cylindrical gear 1-5 are meshed and transmit power. Referring to fig. 3 and 4, bearing blocks 1 to 4 are assembled on a driving motor and reducer integrated housing 1 to 14; the secondary speed reduction driven cylindrical gear and differential assembly 1-12 is assembled in a driving motor and speed reducer integrated shell 1-14 through a bearing, and at the moment, the secondary speed reduction driving cylindrical gear 1-9 is meshed with the secondary speed reduction driven cylindrical gear to transmit power; two-shaft adjusting gaskets 1-11 and one-shaft three-shaft adjusting gaskets 1-13 with proper thicknesses are selected by three shaft systems through size chain calculation, the left shell 1-8 of the speed reducer and the driving motor integrated shell 1-14 in the driving motor assembly 1-1 are connected through bolts, pre-tightening of two-shaft bearings is completed, the left half axle housing 2 is connected with the left shell 1-8 of the speed reducer through bolts, and pre-tightening of one-shaft three-shaft bearings is completed.
The first shaft is an output shaft of a driving motor, the second shaft is a rotating shaft of a secondary speed reduction driving cylindrical gear 1-9, the third shaft is an output shaft of a secondary speed reduction driven cylindrical gear and a differential mechanism assembly 1-12, a two-shaft adjusting gasket 1-11 is arranged between the secondary speed reduction driving cylindrical gear 1-9 and a left shell 1-8 of a speed reducer, and a one-shaft and three-shaft adjusting gasket 1-13 is arranged between the secondary speed reduction driven cylindrical gear and the differential mechanism assembly 1-12 and the left shell 1-8 of the speed reducer and is used for realizing pre-tightening and sealing of a one-shaft three-shaft bearing and a two-shaft bearing respectively.
As shown in fig. 5 is the utility model discloses the structural schematic diagram of well half-bridge shell, half-bridge shell includes left half-bridge shell 2 and right half-bridge shell 3, and the two structure is the same, and the symmetric connection is in driving motor and reduction gear assembly 1's both sides. The utility model discloses set up strengthening rib 10 on left half-bridge shell 2 and right half-bridge shell 3, in order to improve the utility model discloses a parallel shaft integrated form electric drive axle assembly's support rigidity. Use right half axle housing 3 as an example, all be provided with strengthening rib 10 from top to bottom in the vertical centrosymmetric cross-section of right half axle housing 3, strengthening rib 10 is close to driving motor and one side of reduction gear assembly 1, can improve the bending resistance of right half axle housing, guarantees assembly support rigidity.
By adopting a coaxial integrated design, a motor end cover can be shared with a reducer shell, a motor rotor left supporting bearing can be shared with a reducer first shaft right bearing, bearing seats 1-4 and a driving motor and reducer integrated shell 1-14 are assembled and then are integrally processed with related bearing holes, the coaxiality of a motor rotor shaft and a first-stage reduction driving cylindrical gear 1-2 is favorably ensured, the rotation precision of the motor rotor shaft is ensured, meanwhile, a first-stage reduction driving cylindrical gear left bearing 1-3 is assembled in the bearing seats 1-4 and is mutually axially positioned with a second-stage reduction driven cylindrical gear and a differential right bearing in a differential assembly 1-12 through an outer ring, the axial size can be reduced, meanwhile, a first shaft and three shaft adjusting gaskets 1-13 can be used for pre-tightening a first shaft and three shaft bearings, and the electric drive axle assembly is more compact in structural, The cost is lower, and the assembly adjustment of the assembly is convenient.
The utility model adopts a sectional type axle housing scheme to carry out integrated design on the driving motor and the reducer assembly 1, and adopts a motor oil seal built-in scheme, so that a left supporting bearing of the driving motor and a right bearing of a primary speed reduction driving cylindrical gear are shared, and the structural size of the electric drive axle assembly is more compact; the driving motor shell and the right reducer shell are integrally designed, so that the motor part is effectively supported, and the assembly process is simplified; the left bearing 1-3 of the first-stage speed reduction driving cylindrical gear and the right bearing of the differential are mutually axially positioned through the outer ring, so that the assembly is convenient to assemble and adjust.
The utility model also provides a vehicle with coaxial integrated form electric drive axle assembly. Adopt the utility model discloses a coaxial integrated form electric drive axle assembly owing to adopt driving motor and reduction gear integration shell 1-14, can effectively reduce vehicle assembly cost and weight, improves assembly compactedness and transmission efficiency, can reduce the vehicle whole assembly degree of difficulty and meshing noise simultaneously.
It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, rearrangements and substitutions will now occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (7)
1. A coaxial integrated electric drive axle assembly is characterized by comprising a drive motor and a reducer assembly (1), wherein the coaxial integrated design is adopted, and an oil seal of the drive motor is internally arranged; the driving motor and speed reducer assembly (1) comprises a driving motor assembly (1-1), a primary speed reduction driving cylindrical gear (1-2), a primary speed reduction driving cylindrical gear left bearing (1-3), a bearing seat (1-4), a primary speed reduction driven cylindrical gear (1-5), a secondary speed reduction driving cylindrical gear right bearing (1-6), a spacer bush (1-7), a speed reducer left shell (1-8), a secondary speed reduction driving cylindrical gear (1-9), a secondary speed reduction driving cylindrical gear left bearing (1-10), a secondary speed reduction driven cylindrical gear and differential assembly (1-12), a driving motor and speed reducer integrated shell (1-14) and a driving motor left support bearing (1-15); the left support bearing (1-15) of the driving motor is shared with the right bearing of the primary speed reduction driving cylindrical gear (1-2); an output shaft of the driving motor assembly (1-1) and the primary speed reduction driving cylindrical gear (1-2) are in spline fit for torque transmission, and a left bearing (1-3) of the primary speed reduction driving cylindrical gear and a left support bearing of the driving motor support two ends of a shaft of the primary speed reduction driving cylindrical gear (1-2); the two-stage reduction driving cylindrical gear (1-9) is assembled with the one-stage reduction driven cylindrical gear (1-5) through a spline, a spacer bush (1-7) is arranged in the middle of the two-stage reduction driving cylindrical gear (1-9), two ends of the two-stage reduction driving cylindrical gear are supported through a right bearing (1-6) of the two-stage reduction driving cylindrical gear and a left bearing (1-10) of the two-stage reduction driving cylindrical gear, and the one-stage reduction driving cylindrical gear (1-2) is meshed with the one-stage reduction driven cylindrical gear (1-5) and transmits power; the bearing seats (1-4) are assembled on the driving motor and speed reducer integrated shell (1-14); the secondary speed reduction driven cylindrical gear and differential assembly (1-12) is assembled in the driving motor and speed reducer integrated shell (1-14) through a bearing, and the secondary speed reduction driving cylindrical gear (1-9) is meshed with the secondary speed reduction driven cylindrical gear and transmits power; the speed reducer left shell (1-8) is connected with the driving motor and speed reducer integrated shell (1-14) in the driving motor assembly (1-1) through bolts, so that pre-tightening of a two-shaft bearing is completed, and the left half axle housing (2) is connected with the speed reducer left shell (1-8) through bolts, so that pre-tightening of a one-shaft three-shaft bearing is completed.
2. The coaxially integrated electric drive axle assembly according to claim 1, wherein the drive motor and reducer assembly (1) further comprises a two-axis adjusting shim (1-11), the two-axis adjusting shim (1-11) being disposed between the two-stage reduction drive cylindrical gear (1-9) and the reducer left shell (1-8).
3. The coaxially integrated electric drive axle assembly of claim 1, wherein said drive motor and speed reducer assembly (1) further comprises a one-axis, three-axis adjustment shim (1-13), said one-axis, three-axis adjustment shim (1-13) being disposed between said two-stage reduction driven spur gear and differential assembly (1-12) and said speed reducer left shell (1-8).
4. The coaxially integrated electric drive axle assembly of claim 1, further comprising a left axle housing half (2), a right axle housing half (3), a left wheel hub and brake drum assembly (4), a right wheel hub and brake drum assembly (5), a left axle shaft (6), a right axle shaft (7), a left brake assembly (8), a right brake assembly (9); the both sides of driving motor and reduction gear assembly (1) are respectively through bolted connection left half axle housing (2) and right half axle housing (3), left wheel hub and brake drum assembly (4), right wheel hub and brake drum assembly (5) symmetry respectively assemble in left half axle housing (2) and right half axle housing (3) outside end face, left half axle (6) and right half axle (7) assemble respectively on left wheel hub and brake drum assembly (4) and right wheel hub and brake drum assembly (5), left brake assembly (8) and right brake assembly (9) assemble respectively on left half axle housing (2) and right half axle housing (3).
5. The coaxial integrated electric drive axle assembly according to claim 1, wherein the first reduction driving spur gear left bearing (1-3) is fitted in a bearing housing (1-4), and the first reduction driving spur gear left bearing (1-3) and the second reduction driven spur gear and differential right bearing in the differential assembly (1-12) are axially positioned with respect to each other by an outer race.
6. The coaxial integrated electric drive axle assembly according to claim 1, characterized in that the longitudinal centrosymmetric sections of the left axle housing half (2) and the right axle housing half (3) are provided with reinforcing ribs (10) at the upper and lower parts.
7. A vehicle characterized by having a coaxial integrated electric drive axle assembly of any one of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921810647.5U CN211139025U (en) | 2019-10-25 | 2019-10-25 | Coaxial integrated electric drive axle assembly and vehicle with same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921810647.5U CN211139025U (en) | 2019-10-25 | 2019-10-25 | Coaxial integrated electric drive axle assembly and vehicle with same |
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| Publication Number | Publication Date |
|---|---|
| CN211139025U true CN211139025U (en) | 2020-07-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921810647.5U Active CN211139025U (en) | 2019-10-25 | 2019-10-25 | Coaxial integrated electric drive axle assembly and vehicle with same |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112918236A (en) * | 2021-03-18 | 2021-06-08 | 中国重汽集团济南动力有限公司 | Integrated double-motor two-gear electric drive bridge assembly mechanism and driving method |
| CN113459728A (en) * | 2021-07-08 | 2021-10-01 | 上海众联能创新能源科技股份有限公司 | Highly integrated electric drive axle system |
| CN113910881A (en) * | 2021-11-24 | 2022-01-11 | 中国重汽集团济南动力有限公司 | Electric drive axle based on clutch planet shifts |
| CN114087349A (en) * | 2021-11-19 | 2022-02-25 | 一汽解放汽车有限公司 | Vehicle drive axle assembly |
| CN115723480A (en) * | 2022-11-03 | 2023-03-03 | 临沂万和精工机械有限公司 | Driving axle assembly structure of one-axle crawler machine |
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2019
- 2019-10-25 CN CN201921810647.5U patent/CN211139025U/en active Active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112918236A (en) * | 2021-03-18 | 2021-06-08 | 中国重汽集团济南动力有限公司 | Integrated double-motor two-gear electric drive bridge assembly mechanism and driving method |
| CN112918236B (en) * | 2021-03-18 | 2023-01-24 | 中国重汽集团济南动力有限公司 | Integrated double-motor two-gear electric drive bridge assembly mechanism and driving method |
| CN113459728A (en) * | 2021-07-08 | 2021-10-01 | 上海众联能创新能源科技股份有限公司 | Highly integrated electric drive axle system |
| CN114087349A (en) * | 2021-11-19 | 2022-02-25 | 一汽解放汽车有限公司 | Vehicle drive axle assembly |
| CN114087349B (en) * | 2021-11-19 | 2023-12-29 | 一汽解放汽车有限公司 | Vehicle drive axle assembly |
| CN113910881A (en) * | 2021-11-24 | 2022-01-11 | 中国重汽集团济南动力有限公司 | Electric drive axle based on clutch planet shifts |
| CN113910881B (en) * | 2021-11-24 | 2023-12-12 | 中国重汽集团济南动力有限公司 | Electric drive axle based on clutch planet gear shifting |
| CN115723480A (en) * | 2022-11-03 | 2023-03-03 | 临沂万和精工机械有限公司 | Driving axle assembly structure of one-axle crawler machine |
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