Planetary gear device and vehicle

Abstract

The invention relates to a planetary gear arrangement comprising a planetary gear set (2), a planetary gear carrier (3), a planetary pin (4), an oil collector (5) and a planetary gear cover (7), the planetary gear set being rotatably mounted on the planetary pin (4) by means of a rolling bearing (6). The planetary pin (4) penetrates through the planetary gear set (2), the planetary gear support (3), the oil collecting mechanism (5) and the planetary gear cover (7) in the axial direction, the planetary pin (4) is provided with a first axial end (41) and a second axial end (42), the planetary pin (4) is provided with a shoulder (45) at the first axial end (41), and the planetary pin (4) is provided with a second axial end (42) at the second axial end (42). The oil collecting mechanism (5) is fixedly attached to the planetary gear cover (7) through the shoulder (45), and the second axial end (42) is connected to the planetary gear cover (7) in a form-fitting manner.

Description

Technical Field

[0001] The invention relates to the technical field of vehicles, in particular to a planetary gear set that can be used for a gearbox. The invention introduces an oil collecting mechanism fixed on a planetary gear carrier for collecting oil for lubricating a planetary pin shaft and a gear on a differential pin shaft. Background Art

[0002] According to the prior art, the planetary gear device includes a plurality of planetary gear sets, pins, needle bearings and planetary gear brackets. The gears and bearings are mounted on the planetary gear bracket and fixed to the housing cover by bolts. For example, CN208885935U discloses a planetary gear bracket structure, including a bracket body, an end cover and an outer ring, wherein the bracket body includes a support portion and a connecting portion connected to one end of the support portion. An oil distribution plate is also provided on the outer end face of the end cover of the planetary gear bracket, and a plurality of axially extending and hollow oil distribution pipes are distributed in the circumferential direction near one end of the planetary gear bracket structure. The first gear pin and the second gear pin are respectively provided with oil holes, and the oil distribution pipes extend into the oil holes of the first gear pin and the second gear pin respectively, and an oil collecting ring is provided at the other end of the oil distribution plate. The main components of the planetary gear device are mounted on the planetary gear bracket and fixed through the planetary gear cover by multiple bolts. The planetary gear is supported by the planetary gear pins riveted at both ends. The differential gear is supported by the differential pin, and the differential pin is rotatably riveted to the cover side.

[0003] The planetary gear device in the prior art has the following disadvantages:

[0004] -The end cover is fixed to the planetary gear carrier by six bolts. The additional bolts will increase the manufacturing cost.

[0005] - Increased cost of machining screw holes on the planetary gear carrier and cover, and increased installation time;

[0006] -The oil collection mechanism has a special clamping structure, which requires machining matching holes on the planetary gear carrier and cover, increasing the cost and time during the machining process;

[0007] - The oil collecting mechanism is provided with a clamp and an oil guide hole, which need to be installed with high position accuracy with the matching holes on the planetary gear carrier and the cover. The high accuracy requirement will increase the cost of the oil collecting mechanism;

[0008] -Planetary pins and differential pins need to be riveted to prevent them from falling off. This operation requires additional equipment and increases installation costs;

[0009] -The oil collection mechanism is fixed to the planetary gear cover with a clip, which will be damaged during the removal process and cannot be reused, increasing the repair and maintenance costs. Summary of the invention

[0010] The technical problem to be solved by the present invention is to provide an improved planetary gear device which can overcome the above-mentioned shortcomings of the prior art.

[0011] The technical problem is solved by a planetary gear device, which includes a planetary gear set, a planetary gear bracket, a planetary pin, an oil collecting mechanism and a planetary gear cover. The planetary gear set is rotatably supported on the planetary pin through a rolling bearing, and the planetary pin passes through the planetary gear set, the planetary gear bracket, the oil collecting mechanism and the planetary gear cover in the axial direction. The planetary pin has a first axial end and a second axial end. The planetary pin has a shoulder on the first axial end, and the oil collecting mechanism is fixed against the planetary gear cover through the shoulder, and the second axial end is connected to the planetary gear cover in a shape-fitting manner. Through the design scheme of the present invention, the riveting at both ends of the planetary pin can be eliminated, the investment in assembly riveting equipment can be reduced, and the assembly cost can be reduced. The special design of the planetary pin eliminates the connecting bolts and corresponding installation features between the planetary gear cover and the planetary gear bracket, reduces the complexity of parts and part processing, and reduces processing costs.

[0012] According to a preferred embodiment of the present invention, a snap ring groove is provided on the second axial end, and a snap ring is installed in the snap ring groove to fix the planetary pin. The shoulder of the planetary pin and the snap ring groove can provide additional support and fixing functions, and enhance the stability and reliability of the overall device. Through the connection mode of the snap ring groove and the snap ring, the planetary pin can correctly position and connect other components, and connect in a simpler way. It is further preferred that the oil collecting mechanism has a plurality of ears, and the ears match the shoulders, so that the precise alignment and connection of the planetary pin and the oil collecting mechanism can be achieved. The presence of the ears enables the oil collecting mechanism to be closely matched with the planetary pin to form a compact structure. The structure of the oil collecting mechanism is simplified, and the manufacturing is easier. It can be repeatedly disassembled and assembled without damaging the oil collecting mechanism, so that the oil collecting mechanism can be reused, and the maintenance cost is reduced. It is further preferred that the shoulder has a first contour surface, and the oil collecting mechanism has a second contour surface, and the first contour surface is in contact with the second contour surface to limit the rotation of the planetary pin. If the rotation of the planetary pin is not restricted, the rotation will cause the planetary pin to wear, reduce the service life, and cause NVH and other problems after wear. The abutment between the first contour surface and the second contour surface effectively limits the rotation of the planetary pin, ensuring the stability and accuracy of the device during operation. In addition, it can be considered that the planetary pin has an oil inlet on the first contour surface, and the oil collecting mechanism has an oil outlet on the second contour surface. The setting of the oil inlet and the oil outlet enables the lubricating oil to effectively enter and flow out of the key parts of the device, maintaining the lubrication and cooling of the friction surface. The reasonable layout and design of the oil inlet and the oil outlet help to achieve uniform distribution and flow of the lubricating oil, and improve the working efficiency and life of the device. It is further preferred that the planetary pin also has an oil outlet, and the oil outlet and the oil inlet are distributed at 180° in the radial direction. The oil outlet can be preferably arranged where the planetary pin is supported by the rolling bearing, the oil inlet of the planetary pin is radially inward, and the oil outlet is radially outward away from the axis, which is approximately 180°, so that during operation, the centrifugal force generated by the rotation of the planetary gear device can promote the lubricating oil to flow better, improving the working efficiency and performance stability of the device.

[0013] According to a preferred embodiment of the present invention, the planetary pin has a hollow structure. The hollow structure of the planetary pin can reduce the weight of the device and improve the operating efficiency and flexibility of the device. The hollow structure can also provide a channel for the lubrication system to facilitate the flow and distribution of lubricating oil and ensure the lubrication effect of various parts of the device.

[0014] According to a preferred embodiment of the present invention, the planetary pin is transitionally matched with the planetary gear support and the planetary gear cover. The design of the transitional fit makes the connection between the planetary pin and the planetary gear support and the planetary gear cover tight and reliable, ensuring the stability and accuracy of the device during operation. Through the transitional fit, interference fit and riveting processes are not required, thus eliminating the connecting bolts and corresponding installation features between the planetary gear cover and the planetary gear support, reducing the complexity of parts and part processing, and reducing processing costs.

[0015] According to a preferred embodiment of the present invention, the inner surface of the oil collecting mechanism contacts the end surface of the planetary gear cover, and a seal is formed between the inner surface and the end surface. The contact between the inner surface and the end surface can effectively seal the internal space of the device to prevent the leakage of lubricating oil and the entry of external contaminants. The seal design helps to maintain the lubrication and cooling effect inside the device and improve the working efficiency and reliability of the device.

[0016] In addition, the above technical problem can also be solved by a vehicle provided according to the present invention, which has the planetary gear device described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The technical solution is further described below in conjunction with the embodiments of the present invention.

[0018] Figure 1 A cross-sectional view of a planetary gear device designed according to an embodiment of the present invention is shown;

[0019] Figure 2 A perspective view showing a planetary pin designed according to an embodiment of the present invention;

[0020] Figure 3a A three-dimensional diagram showing an oil collecting mechanism designed according to an embodiment of the present invention;

[0021] Figure 3b A three-dimensional diagram showing an oil collecting mechanism designed according to an embodiment of the present invention;

[0022] Figure 4a A perspective view of a planetary gear device designed according to an embodiment of the present invention is shown;

[0023] Figure 4b A perspective view of a planetary gear device designed according to an embodiment of the present invention is shown.

[0024] The “axial direction” and “radial direction” mentioned in the present invention both refer to the axial direction and the radial direction of the rotation shaft of the planetary gear device. DETAILED DESCRIPTION

[0025] like Figure 1 As shown, the planetary gear device 1 has a planetary gear set 2, a planetary gear carrier 3, a planetary pin 4 and an oil collecting mechanism 5. The planetary gear set 1 is rotatably supported on the planetary pin 4 via a rolling bearing 6, and the planetary pin 4 passes through the planetary gear set 2, the planetary gear carrier 3, the oil collecting mechanism 5 and the planetary gear cover 7 in the axial direction.

[0026] Figure 2A stereoscopic view of the planetary pin 4 is shown. The planetary pin 4 has a first axial end 41 and a second axial end 42, wherein the oil collecting mechanism 5 is fixed against the planetary gear support 3 by the first axial end 41. Therefore, during operation, the oil collecting mechanism 5 will rotate with the planetary gear support 3, but will not rotate relative to the planetary gear support 3. The planetary pin 4 has a shoulder 45 at the first axial end 41, and an oil inlet hole 46 is machined in the circumferential direction of the shoulder 45. The shoulder 45 has a first contour surface 47 in the radial direction of the oil inlet hole 46, which is used to abut against the second contour surface 51 of the oil collecting mechanism 5, thereby limiting the rotation of the planetary pin 4, so that the oil inlet hole 46 of the planetary pin 4 is always facing the inside of the oil collecting mechanism 5. A retaining ring groove 43 is provided on the second axial end 42, and the planetary pin 4 is fixed by an additionally arranged retaining ring 44. The planetary pin 4 has a hollow structure, and the oil collected by the oil collecting mechanism 5 is guided into the hollow hole. As shown Figure 1 As shown, the oil outlet hole 49 of the planetary pin 4 is arranged in the middle of the planetary pin 4, and it can be seen in the cross-sectional view that the opening of the oil inlet hole 46 faces the planetary shaft, that is, radially inward, while the opening of the oil outlet hole 49 faces away from the planetary shaft, that is, radially outward. In other words, the oil inlet hole 46 and the oil outlet hole 49 are distributed at 180 degrees in the cross-sectional view, so that during operation, the oil flows out of the oil outlet hole by centrifugal force to lubricate the rolling bearing 6 on the pin shaft.

[0027] FIG3 shows the oil collecting mechanism 5 from different perspectives. The oil collecting mechanism 5 has three ears 52, which match the planetary pin 4. There is a step between the ear 52 and the body of the oil collecting mechanism 5, forming a second contour surface 51. This stepped space is used to accommodate the first axial end of the planetary pin 4. In this way, the axial space of the oil collecting mechanism 5 is fully utilized, making the entire structure more compact. During installation, the planetary pin 4 passes axially through the ear 52, so that the radial surface 48 of the planetary pin shaft contacts the ear surface 53 of the oil collecting mechanism 5, the first contour surface 47 contacts the second contour surface 51 of the oil collecting mechanism 5, and then the retaining ring 44 is installed on the second axial end 42 of the planetary pin 4. The inner surface 54 of the oil collecting mechanism 5 contacts the end surface of the planetary gear cover 7, and a sealing surface is formed between them. An oil outlet 56 is provided on the second contour surface 51. The inward flange of the oil collecting mechanism 5 can collect the oil through the oil inlet 56 into the oil storage space 55 formed by the oil collecting mechanism 5 and the planetary gear cover 7, and then guide the oil to the hollow hole of the planetary pin 4 and the hollow hole of the differential pin.

[0028] Fig. 4 shows a three-dimensional view of a planetary gear device designed according to an embodiment of the present invention at two different angles. In this embodiment, three planetary pins 4 are used, and the present application does not limit the number of planetary pins 4, and any number can be used according to design requirements. Figure 4a A front perspective view showing a first axial end 4 of a planet pin 4, Figure 4bThe front perspective view of the second axial end 42 of the planetary pin 4 is shown. With this design of the planetary pin 4, the riveting at both ends of the planetary pin 4 can be eliminated, the investment in assembly riveting equipment can be reduced, and the assembly cost can be reduced. Figure 4a It can be seen that, since the first contour surface 47 of the planetary pin 4 is in contact with the second contour surface 51 of the oil collecting mechanism 5, the planetary pin 4 is prevented from rotating, and the oil inlet hole 46 of the planetary pin 4 is positioned toward the inside of the oil collecting mechanism 5, especially aligned with the oil outlet 56 of the oil collecting mechanism 5. In addition, since the axial direction and rotation direction of the planetary pin 4 are restricted, the planetary pin 4 can be designed to be transitionally matched with the planetary carrier 3 and the planetary gear cover 7, without the need for interference fit and riveting processes, thereby eliminating the connecting bolts and corresponding installation features between the planetary gear cover 7 and the planetary gear carrier 3, reducing the complexity of parts and part processing, and reducing processing costs.

[0029] Reference numerals list

[0030] 1 Planetary gear unit

[0031] 2 Planetary gear sets

[0032] 3 Planetary gear bracket

[0033] 4 Planetary pins

[0034] 41 First axial end

[0035] 42 Second axial end

[0036] 43 Snap ring groove

[0037] 44 Snap ring

[0038] 45 Shoulder

[0039] 46 Oil inlet hole

[0040] 47 First contour surface

[0041] 48 Radial surface

[0042] 49 Oil outlet

[0043] 5 Oil gathering mechanism

[0044] 51 Second contour surface

[0045] 52 Ear

[0046] 53 Ear surface

[0047] 54 Inner surface

[0048] 55 Oil storage space

[0049] 56 Oil outlet

[0050] 6 Rolling bearings

[0051] 7 Planetary gear cover

Claims

1. A planetary gear device, comprising a planetary gear set (2), a planetary gear support (3), a planetary pin (4), an oil collecting mechanism (5) and a planetary gear cover (7), wherein: The planetary gear set (2) is rotatably supported on the planetary pin (4) via a rolling bearing (6); the planetary pin (4) axially passes through the planetary gear set (2), the planetary gear support (3), the oil collecting mechanism (5) and the planetary gear cover (7); wherein the planetary pin (4) has a first axial end (41) and a second axial end (42); the planetary pin (4) has a shoulder (45) on the first axial end (41); the oil collecting mechanism (5) is fixed against the planetary gear cover (7) via the shoulder (45); and the second axial end (42) is connected to the planetary gear cover (7) in a shape-fitting manner.

2. The planetary gear device according to claim 1, characterized in that: The planetary pin (4) has a snap ring groove (43) on the second axial end (42), and a snap ring (44) is installed in the snap ring groove (43) to fix the planetary pin (4).

3. The planetary gear device according to claim 2, characterized in that: The oil collecting mechanism (5) has a plurality of ears (52), and the ears (52) match the shoulders (45).

4. The planetary gear device according to claim 3, characterized in that: The shoulder (45) has a first contour surface (47), and the oil collecting mechanism (5) has a second contour surface (51), wherein the first contour surface (47) and the second contour surface (51) are in contact with each other to limit the rotation of the planetary pin (4).

5. The planetary gear device according to claim 4, characterized in that: The planetary pin (4) has an oil inlet hole (46) on the first contour surface (47), and the oil collecting mechanism (5) has an oil outlet (56) on the second contour surface (51).

6. The planetary gear device according to claim 5, characterized in that: The planetary pin (4) has an oil outlet hole (49), wherein the oil outlet hole (49) and the oil inlet hole (46) are distributed at an angle of 180° in the radial direction.

7. The planetary gear device according to any one of claims 1 to 6, characterized in that: The planetary pin (4) has a hollow structure.

8. The planetary gear device according to any one of claims 1 to 6, characterized in that: The planetary pin (4) is in transition fit with the planetary gear support (3) and the planetary gear cover (7).

9. The planetary gear device according to any one of claims 1 to 6, characterized in that: The inner surface (54) of the oil collecting mechanism (5) contacts the end surface of the planetary gear cover (7), and a seal is formed between the inner surface (54) and the end surface.

10. A vehicle, characterized in that The vehicle has a planetary gear arrangement according to any one of claims 1 to 9.

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