CN219191909U - Vehicle traveling driving device - Google Patents
Vehicle traveling driving device Download PDFInfo
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- CN219191909U CN219191909U CN202320787260.2U CN202320787260U CN219191909U CN 219191909 U CN219191909 U CN 219191909U CN 202320787260 U CN202320787260 U CN 202320787260U CN 219191909 U CN219191909 U CN 219191909U
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Abstract
The utility model belongs to the technical field of vehicles, and particularly relates to a vehicle traveling driving device. Aiming at the defect that the output gear shaft is supported by a bearing at one side and easily deflects, the utility model adopts the following technical scheme: a vehicle travel drive device comprising: a motor including an output shaft; the output gear shaft is coaxially arranged with the output shaft; a gear assembly linking the output shaft and the output gear shaft; a rim mounted on the output gear shaft; two first bearings; the gear part of the output gear shaft faces the center of the end face of the output shaft, a bearing groove is formed in the bearing groove, a second bearing is arranged in the bearing groove, an inner ring of the second bearing is matched with the output shaft, and an outer ring of the second bearing is matched with the output gear shaft. The beneficial effects of the utility model are as follows: the stress of the output gear shaft is improved, deflection of the output gear shaft is reduced or avoided, noise is reduced, and coaxiality of the output gear shaft and an output shaft of the motor is ensured.
Description
Technical Field
The utility model belongs to the technical field of vehicles, and particularly relates to a vehicle traveling driving device.
Background
Referring to fig. 1, a conventional walking driving device of a forklift (electro-hydraulic) is used for driving the forklift to walk, and the basic working principle is as follows: the output shaft of the motor rotates, and the gear set drives the output gear shaft and the rim on the output gear shaft to rotate, so that the forklift can walk.
The applicant has found that after a period of use, the following conditions are liable to occur: 1. the gear set is severely worn, even the situation of tooth breakage occurs; 2. the contact part of the rim and the gear set is severely worn; 3. the noise is larger.
After analytical studies, the applicant has reached the following conclusions: 1. the output gear shaft is only supported by a bearing at one side, the output gear shaft is not firmly fixed, deflection (particularly obvious during heavy load) is easy to occur, the gear set is worn after the deflection of the output gear shaft, certain noise is generated, and concentricity problem is caused; 2. after the output gear shaft and the rim are fixedly connected through the nuts, the two bearings between the output gear shaft and the rim are also locked (force transmission between the two bearings is realized by a boss on the output gear shaft) so that the two bearings cannot rotate, and the walking driving device cannot work normally.
Disclosure of Invention
The utility model provides the vehicle traveling driving device aiming at the defect that the deflection easily occurs because the output gear shaft is only supported by the bearing at one side, improves the stress of the output gear shaft, reduces or avoids the deflection of the output gear shaft and ensures the concentricity of the output gear shaft and the output shaft of the motor.
In order to achieve the above purpose, the utility model adopts the following technical scheme: a vehicle travel drive device, the vehicle travel drive device comprising:
a motor including an output shaft;
an output gear shaft coaxially arranged with the output shaft and having a gear portion and a connecting portion;
a gear assembly linking the output shaft and the output gear shaft;
a rim mounted on the output gear shaft;
the two first bearings are positioned on the same side of the axial direction of the gear part, the inner ring is matched with the output gear shaft, and the outer ring is matched with the gear assembly;
the gear part of the output gear shaft faces the center of the end face of the output shaft, a bearing groove is formed in the bearing groove, a second bearing is arranged in the bearing groove, an inner ring of the second bearing is matched with the output shaft, and an outer ring of the second bearing is matched with the output gear shaft.
According to the vehicle traveling driving device, the bearing groove is formed in the center of the end face of the output gear shaft, which faces the output shaft, the second bearing is arranged in the bearing groove, the inner ring of the second bearing is matched with the output shaft of the motor, the outer ring of the second bearing is matched with the output gear shaft, the second bearing and the first bearing simultaneously support the output gear shaft, the stress of the output gear shaft is improved, the deflection of the output gear shaft is reduced or avoided, the noise is reduced, and the coaxiality of the output gear shaft and the output shaft of the motor is ensured.
As an improvement, the end part of the output gear shaft is fixedly connected with the rim through a lock nut; the output gear shaft is connected with the rim key. The output gear shaft is fixedly connected with the rim through the lock nut, the output gear shaft and the rim form a compact whole, the relative movement between the output gear shaft and the rim is reduced or avoided, the abrasion is reduced, and the noise is reduced.
As an improvement, a force transmission piece is arranged between the inner rings of the two first bearings, and an oil seal piece is arranged on the radial outer side of the force transmission piece. The force transmission piece is arranged between the inner rings of the two first bearings, and the locking force of the locking nut is transmitted to the output gear shaft through the rim, the inner rings of the two first bearings and the force transmission piece, so that the two first bearings can work normally without locking. And an oil seal is arranged to ensure sealing.
As an improvement, the force transmission piece is sealed with the output gear shaft, or a sealing piece is arranged on the radial inner side of the force transmission piece. The force transmission piece can be in interference fit with the output gear shaft for sealing. For maintenance reasons, a seal may be provided radially inside the force-transmitting member for sealing. The force-transmitting member is preferably a ring-shaped member. The sealing element can be an O-shaped sealing ring.
As an improvement, an axial gap exists between the outer ring of the outer first bearing and the rim, and an axial gap exists between the inner first bearing and the output gear shaft, so that the two first bearings can work normally without locking.
As an improvement, the gear assembly comprises a gear meshed with the output shaft, a toothed shaft synchronously rotating with the gear, and a retainer, wherein the toothed shaft is meshed with the output gear shaft. The gear, the toothed shaft and the retainer are connected into a whole through assembly, so that the respective processing is convenient. As the process advances, two or three of the gear, toothed shaft and cage may be one piece.
As a modification, the cage extends radially inwardly to form a boss located axially between the two first bearings.
As an improvement, the gear assembly further comprises a third bearing provided on the gear and a fourth bearing provided on the toothed shaft.
As an improvement, the retainer is provided with an oil hole; a sealing ring is arranged between the retainer and the end cover of the motor; the retainer is fixed with the end cover of the motor through screws.
As an improvement, the vehicle traveling driving device further comprises a tire, the rim is fastened with the tire through screws, and a fifth bearing is arranged between the tire and the motor in the radial direction.
The vehicle traveling driving device has the beneficial effects that: the bearing groove is formed in the center of the end face of the output gear shaft, the second bearing is arranged in the bearing groove, the inner ring of the second bearing is matched with the output shaft of the motor, the outer ring of the second bearing is matched with the output gear shaft, the second bearing and the first bearing support the output gear shaft at the same time, stress of the output gear shaft is improved, deflection of the output gear shaft is reduced or avoided, noise is reduced, and coaxiality of the output gear shaft and the output shaft of the motor is guaranteed. Further, the output gear shaft is tightly connected with the rim by adopting the lock nut, a force transmission piece is arranged between the two first bearings in the axial direction, an axial gap is reserved between the two first bearings and the rim as well as between the two first bearings and the output gear shaft, and the two first bearings cannot be locked, so that normal work is ensured.
Drawings
Fig. 1 is a cross-sectional view of a conventional wheel travel drive device.
Fig. 2 is a schematic perspective view of a vehicle travel driving device according to a first embodiment of the present utility model.
Fig. 3 and 4 are exploded views of the vehicle travel drive device according to the first embodiment of the present utility model, which is different in angle.
Fig. 5 is a cross-sectional view of a vehicle travel drive device according to a first embodiment of the present utility model.
Fig. 6 is an enlarged partial schematic view of fig. 5.
Fig. 7 is a cross-sectional view of a vehicle travel drive device according to a second embodiment of the present utility model.
In the figure, 1, a motor; 11. an output shaft;
2. a gear assembly; 21. a gear; 22. a toothed shaft; 23. a retainer; 24. a force transmitting member; 25. an oil seal; 26. a seal; 27. a third bearing; 28. a fourth bearing;
3. an output gear shaft; 31. a gear portion; 32. a connection part; 33. a bearing groove;
4. a rim;
5. a first bearing;
6. a second bearing;
7. a lock nut;
8. a tire;
9. and a fifth bearing.
Detailed Description
The technical solutions of the inventive embodiments of the present utility model will be explained and illustrated below in conjunction with the drawings of the inventive embodiments of the present utility model, the following examples are merely preferred embodiments of the utility model and are not all examples. Based on the examples in the implementation manner, other examples obtained by a person skilled in the art without making any inventive effort fall within the scope of protection created by the present utility model.
A vehicle travel drive device, the vehicle travel drive device comprising:
a motor including an output shaft;
an output gear shaft coaxially arranged with the output shaft and having a gear portion and a connecting portion;
a gear assembly linking the output shaft and the output gear shaft;
a rim mounted on the output gear shaft;
the two first bearings are positioned on the same side of the axial direction of the gear part, the inner ring is matched with the output gear shaft, and the outer ring is matched with the gear assembly;
the gear part of the output gear shaft faces the center of the end face of the output shaft, a bearing groove is formed in the bearing groove, a second bearing is arranged in the bearing groove, an inner ring of the second bearing is matched with the output shaft, and an outer ring of the second bearing is matched with the output gear shaft.
According to the vehicle traveling driving device, the bearing groove is formed in the center of the end face of the output gear shaft, which faces the output shaft, the second bearing is arranged in the bearing groove, the inner ring of the second bearing is matched with the output shaft of the motor, the outer ring of the second bearing is matched with the output gear shaft, the second bearing and the first bearing simultaneously support the output gear shaft, the stress of the output gear shaft is improved, the deflection of the output gear shaft is reduced or avoided, the noise is reduced, and the coaxiality of the output gear shaft and the output shaft of the motor is ensured.
Example 1
Referring to fig. 2, a vehicle travel driving device according to a first embodiment of the present utility model includes:
a motor 1 including an output shaft 11;
an output gear shaft 3 coaxially provided with the output shaft 11 and having a gear portion 31 and a connecting portion 32, the gear portion 31 being located closer to the output shaft 11 than the connecting portion 32, the diameter of the gear portion 31 being larger than the diameter of the connecting portion 32;
a gear assembly 2 that links the output shaft 11 and the output gear shaft 3;
a rim 4 mounted on the output gear shaft 3;
the two first bearings 5 are positioned on the same side of the axial direction of the gear part 31, the inner ring is matched with the output gear shaft 3, and the outer ring is matched with the retainer 23 of the gear assembly 2;
the gear portion 31 of the output gear shaft 3 is provided with a bearing groove 33 toward the center of the end face of the output shaft 11, a second bearing 6 is provided in the bearing groove 33, an inner ring of the second bearing 6 is matched with the output shaft 11, and an outer ring of the second bearing 6 is matched with the output gear shaft 3.
In the present embodiment, the end of the output shaft 11 of the motor 1 is inserted into the bearing 6.
In the embodiment, the end part of the output gear shaft 3 is fixedly connected with the rim 4 through a lock nut 7; the output gear shaft 3 is connected with the rim 4 in a key way. The output gear shaft 3 is fixedly connected with the rim 4 through the lock nut 7, the output gear shaft 3 and the rim 4 form a compact whole, the relative movement between the output gear shaft 3 and the rim 4 is reduced or avoided, the abrasion is reduced, and the noise is reduced. The connecting portion 31 of the output gear shaft 3 is formed with a spline, the rim 4 is formed with a spline, and the output gear shaft 3 is connected with the rim 4 through the spline.
In this embodiment, the connecting portion 32 of the output gear shaft 3 includes a first connecting section with the rim 4 and a second connecting section with the lock nut 7, the diameter of the second connecting section being smaller than that of the first connecting section.
In this embodiment, a force transmission member 24 is disposed between the inner rings of the two first bearings 5, and an oil seal member 25 is disposed radially outside the force transmission member 24. By arranging the force transmission piece 24 between the inner rings of the two first bearings 5, the locking force of the locking nut 7 is transmitted to the output gear shaft 3 through the rim 4, the inner rings of the two first bearings 5 and the force transmission piece 24, so that the two first bearings 5 can work normally without locking. An oil seal 25 is provided to ensure sealing.
In this embodiment, the force transmission member 24 is sealed with the output gear shaft 3, or a sealing member 26 is provided radially inside the force transmission member 24. The force-transmitting member 24 may be sealed with an interference fit with the output gear shaft 3. For maintenance reasons, a seal 26 may be provided radially inside the force-transmitting member 24 for sealing. The force-transmitting member 24 is preferably a ring-shaped member. The seal 26 may be an O-ring seal.
In this embodiment, an axial gap exists between the outer ring of the outer first bearing 5 and the rim 4, and an axial gap exists between the inner first bearing 5 and the output gear shaft 3, so that the two first bearings 5 can work normally without locking.
In this embodiment, the gear assembly 2 includes a gear 21 meshed with the output shaft 11, a toothed shaft 22 rotating in synchronization with the gear 21, and a cage 23, the toothed shaft 22 being meshed with the output gear shaft 3. The gear 21 and the toothed shaft 22 are integrally connected by assembly to facilitate the respective processing. As the process progresses, the gear 21 and toothed shaft 22 may be one piece. The output shaft 11 is a gear shaft having teeth.
In this embodiment, the radially inner side of the cage 23 extends to form a boss located axially between the two first bearings 5.
In this embodiment, the gear assembly 2 further comprises a third bearing 27 provided on the gear 21 and a fourth bearing 28 provided on the toothed shaft 22.
In this embodiment, the retainer 23 is provided with an oil hole; a sealing ring is arranged between the retainer 23 and the end cover of the motor 1; the cage 23 is sealed with the end cap of the motor 1 by a plurality of axially arranged screws. In the figures, a plurality of screws connecting the cage 23 and the end cap of the motor 1 are not shown. An oil plug is arranged in the oil hole.
In this embodiment, the vehicle running driving device further includes a tire 8, the rim 4 is fastened to the tire 8 by screws, and a fifth bearing 9 is disposed between the tire 8 and the motor 1 in a radial direction. In fig. 3 and 4, the fifth bearing 9 is not shown.
The working principle of the vehicle traveling driving device of the embodiment is as follows: the output shaft 11 of the motor 1 rotates, the output shaft 11 is provided with teeth, the teeth are meshed with the gear 21 to drive the gear 21 to rotate, the gear 21 is connected with the toothed shaft 22 through a flat key, the gear 21 drives the toothed shaft 22 to rotate, the toothed shaft 22 is meshed with the output gear shaft 3, the toothed shaft 22 drives the output gear shaft 3 to rotate, the output gear shaft 3 is fixedly connected with the rim 4, the output gear shaft 3 drives the rim 4 to rotate, the rim 4 is fixedly connected with the tire 8, and the rim 4 drives the tire 8 to rotate. When the output gear shaft 3 has a tendency of deflection during heavy load, the output shaft 11 of the motor 1, the second bearing 6, the first bearing 5 and the retainer 23 simultaneously play a direct or indirect supporting and limiting role on the output gear shaft 3 due to the arrangement of the first bearing 5 and the second bearing 6, and deflection of the output gear shaft 3 is reduced or avoided. The output gear shaft 3 and the rim 5 are connected into a compact whole through the lock nut 7, so that no or almost no relative motion is generated between the output gear shaft 3 and the rim 5, the abrasion between the output gear shaft 3 and the rim 5 is reduced or avoided, and the noise is reduced.
In this embodiment, the motor 1 is provided with an electromagnetic braking device.
In this embodiment, a spring washer is provided between the lock nut 7 and the rim 5.
The vehicle traveling driving device of the first embodiment of the utility model has the beneficial effects that: a bearing groove 33 is formed in the center of the end face of the output gear shaft 3, which faces the output shaft 11, a second bearing 6 is arranged in the bearing groove 33, the inner ring of the second bearing 6 is matched with the output shaft 11 of the motor 1, the outer ring is matched with the output gear shaft 3, the second bearing 6 and the first bearing 5 simultaneously support the output gear shaft 3, the stress of the output gear shaft 3 is improved, the deflection of the output gear shaft 3 is reduced or avoided, the noise is reduced, and the coaxiality of the output gear shaft 3 and the output shaft 11 of the motor 1 is ensured. Further, the output gear shaft 3 is tightly connected with the rim 4 by adopting the lock nut 7, a force transmission piece 24 is arranged between the two first bearings 5 in the axial direction, an axial gap is reserved between the two first bearings 5 and the rim 4 as well as between the two first bearings 5 and the output gear shaft 3, and the two first bearings 5 are not locked, so that normal work is ensured; the output gear shaft 3 and the rim 4 are fastened through the lock nut 7, so that relative movement between the output gear shaft 3 and the rim 4 is avoided, and abrasion caused by the relative movement is reduced; a force transmission piece 24 is arranged between the two first bearings 5, so that the two first bearings 5 are prevented from being blocked, and normal work is ensured; the force-transmitting member 24 is provided radially inwardly with a sealing member 26 to ensure sealing.
Example 1
Referring to fig. 2, the vehicle travel drive device of the second embodiment is different from that of the first embodiment in that: the force transmission piece 24 and the sealing piece 26 are not arranged, only the oil sealing piece 25 is arranged between the two first bearings 5 in the axial direction, and the locking nut 7 is not screwed.
In this embodiment, the difference from the prior art is only that the bearing groove 33 is provided on the end face of the output gear shaft 3, the second bearing 6 is provided in the bearing groove 33, the inner ring of the second bearing 6 is fitted with the output shaft 11 of the motor 1, and the outer ring is fitted with the circumferential inner wall of the bearing groove 33 of the output gear shaft 3.
Compared with the first embodiment, the present embodiment has no force transmission member 24 and sealing member 26, and has a simpler structure, and compared with the prior art, the deflection of the output gear shaft 3 is reduced or avoided after the second bearing 6 is provided, and the coaxiality of the output shaft 11 and the output gear shaft 3 is ensured, thereby reducing abrasion and noise.
While the utility model has been described in terms of specific embodiments, it will be apparent to those skilled in the art that the utility model is not limited to the specific embodiments described. Any modifications which do not depart from the functional and structural principles of the present utility model are intended to be included within the scope of the appended claims.
Claims (10)
1. The vehicle walking driving device is characterized in that: the vehicle travel drive device includes:
a motor (1) comprising an output shaft (11);
an output gear shaft (3) coaxially provided with the output shaft (11) and having a gear portion (31) and a connecting portion (32);
-a gear assembly (2) linking the output shaft (11) and the output gear shaft (3);
a rim (4) mounted on the output gear shaft (3);
the two first bearings (5) are positioned on the same side of the axial direction of the gear part (31), the inner ring is matched with the output gear shaft (3), and the outer ring is matched with the gear assembly (2);
the gear part (31) of the output gear shaft (3) faces to the center of the end face of the output shaft (11), a bearing groove (33) is formed in the bearing groove (33), a second bearing (6) is arranged in the bearing groove (33), the inner ring of the second bearing (6) is matched with the output shaft (11), and the outer ring is matched with the output gear shaft (3).
2. The vehicle travel drive device according to claim 1, characterized in that: the end part of the output gear shaft (3) is fixedly connected with the rim (4) through a lock nut (7); the output gear shaft (3) is connected with the rim (4) through a key.
3. The vehicle travel drive device according to claim 2, characterized in that: a force transmission piece (24) is arranged between the inner rings of the two first bearings (5), and an oil seal piece (25) is arranged on the radial outer side of the force transmission piece (24).
4. A vehicle travel drive according to claim 3, wherein: the force transmission piece (24) is sealed with the output gear shaft (3), or a sealing piece (26) is arranged on the radial inner side of the force transmission piece (24).
5. A vehicle travel drive according to claim 3, wherein: an axial gap exists between the outer ring of the outer first bearing (5) and the rim (4), and an axial gap exists between the inner first bearing (5) and the output gear shaft (3).
6. The vehicle travel drive device according to claim 5, characterized in that: the gear assembly (2) comprises a gear (21) meshed with the output shaft (11), a toothed shaft (22) synchronously rotating with the gear (21) and a retainer (23), and the toothed shaft (22) is meshed with the output gear shaft (3).
7. The vehicle travel drive device according to claim 6, characterized in that: the retainer (23) extends radially inwards to form a boss located axially between the two first bearings (5).
8. The vehicle travel drive device according to claim 6, characterized in that: the gear assembly (2) further comprises a third bearing (27) provided on the gear (21) and a fourth bearing (28) provided on the toothed shaft (22).
9. The vehicle travel drive device according to claim 6, characterized in that: an oil hole is formed in the retainer (23); a sealing ring is arranged between the retainer (23) and the end cover of the motor (1); the retainer (23) is fixed with the end cover of the motor (1) through screws.
10. The vehicle travel drive device according to claim 1, characterized in that: the vehicle running driving device further comprises a tire (8), the rim (4) is fastened with the tire (8) through screws, and a fifth bearing (9) is arranged between the tire (8) and the motor (1) in the radial direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320787260.2U CN219191909U (en) | 2023-04-07 | 2023-04-07 | Vehicle traveling driving device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320787260.2U CN219191909U (en) | 2023-04-07 | 2023-04-07 | Vehicle traveling driving device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219191909U true CN219191909U (en) | 2023-06-16 |
Family
ID=86720473
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320787260.2U Active CN219191909U (en) | 2023-04-07 | 2023-04-07 | Vehicle traveling driving device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219191909U (en) |
-
2023
- 2023-04-07 CN CN202320787260.2U patent/CN219191909U/en active Active
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