Oil collecting assembly for planetary gearbox and planetary gearbox

Abstract

The utility model provides an oil collecting assembly for a planetary gearbox and the planetary gearbox. The oil collecting assembly for the planetary gearbox comprises a planet carrier (1) and a plurality of oil collecting assemblies, wherein the planet carrier (1) is used for supporting a plurality of planetary gears (2); the planetary pins (4) are connected to the planetary carrier (1), each planetary pin (4) is in a hollow circular tube shape, and the planetary pins (4) are used for supporting the planetary gears (2); the multiple oil collectors (3) are arranged in the circumferential direction (C) of the planet carrier (1) at intervals, each oil collector (3) comprises an oil collecting groove (31) and an oil guiding column (32), the oil guiding columns (32) are inserted and connected to the planet pins (4), the oil collecting grooves (31) are provided with oil collecting cavities used for collecting oil, the oil collecting cavities are provided with openings facing the radial inner side of the planet carrier (1), the oil collecting grooves (31) are formed in the axial ends of the oil guiding columns (32), and the oil guiding columns (32) are provided with openings facing the radial inner side of the planet carrier (1). And the oil collecting cavity is communicated with the oil guide column (32).

Description

Technical Field

[0001] This application relates to the field of vehicle technology, and specifically to an oil collection assembly for a planetary gearbox and a planetary gearbox. Background Technology

[0002] In a planetary gearbox, planetary gears are mounted on planetary pins via gear bearings. The hollow planetary pins provide lubricating oil to the gear bearings. Typically, an oil collector is installed on the end face of the planetary carrier to collect oil splashed from the planetary gears and then guides the oil to the hollow planetary pins to lubricate the gear bearings on those pins.

[0003] DE102010051056A1 and DE102018128057A1 disclose an integrated oil collector, which is annular in shape. DE102011007800A1 discloses a split-type oil collector. The split-type oil collector is manufactured by dividing the annular integrated oil collector into several parts, and then installing and connecting them together to form an annular shape. Utility Model Content

[0004] This application aims to provide an oil collection assembly for planetary gearboxes, so that oil collectors of the same specifications can be applied to planetary gear systems with different center distances.

[0005] This application proposes an oil collection assembly for a planetary gearbox, comprising:

[0006] Planet carrier, which supports multiple planetary gears;

[0007] A plurality of planetary pins, connected to the planet carrier, wherein the planetary pins are hollow cylindrical tubes, and the planetary pins are used to support the planetary gears; and

[0008] Multiple oil collectors are arranged circumferentially spaced along the planetary carrier. Each oil collector includes an oil collection groove and an oil guide column. The oil guide column is inserted into and connected to the planetary pin. The oil collection groove has an oil collection cavity for collecting oil. The oil collection cavity has an opening facing the radially inward side of the planetary carrier. The oil collection groove is located at one axial end of the oil guide column. The oil collection cavity and the oil guide column are in communication.

[0009] In at least one possible implementation, the outer diameter of the main body of the oil guide column is smaller than the inner diameter of the planetary pin, and an oil reservoir is formed between the outer circumferential surface of the oil guide column and the inner circumferential surface of the planetary pin.

[0010] In at least one possible implementation, the oil guide column is provided with a sealing ring that protrudes from the outer circumferential surface of the main body of the oil guide column. The outer diameter of the sealing ring is the same as the inner diameter of the planetary pin, thereby sealing the oil reservoir.

[0011] In at least one possible implementation, the oil collection tank includes a bottom wall and two retaining walls, the two retaining walls being respectively connected to the bottom wall at both ends of the planetary carrier in the circumferential direction.

[0012] In at least one possible implementation, the direction of extension of the retaining wall is parallel to the radial direction of the planetary carrier.

[0013] In at least one possible implementation, the oil collecting assembly further includes a bolt, the planetary pin has a mounting protrusion on its inner side, the mounting protrusion protrudes radially inward from the inner circumference of the planetary pin, the other axial end of the oil guide column has an internal thread, and the bolt passes through the mounting protrusion and is screwed into the internal thread, thereby connecting the oil collector to the planetary pin.

[0014] In at least one possible implementation, the bolt is completely housed inside the hollow planetary pin.

[0015] In at least one possible implementation, the oil collecting trough is provided with an anti-rotation part, and the end face of the planetary carrier is provided with an anti-rotation mating part. The anti-rotation part and the anti-rotation mating part cooperate to prevent the oil collector from rotating relative to the planetary carrier around the oil guide column.

[0016] This application also proposes a planetary gearbox, comprising:

[0017] The oil collection component described in any one of the above technical solutions; and

[0018] Multiple planetary gears.

[0019] In at least one possible implementation, the planetary gear is a double gear, and the oil collection groove is located on one axial side of the planet carrier. In the axial direction of the planet carrier, the oil collection groove is located on the side of the double gear with the larger radial dimension.

[0020] By adopting the above technical solution, multiple oil collectors are arranged at intervals along the circumference of the planetary carrier, so that oil collectors of the same specification can be used for planetary gear systems with different center distances. Attached Figure Description

[0021] Figure 1 A partial structural schematic diagram of a planetary gearbox according to an embodiment of this application is shown.

[0022] Figure 2 A partial structural schematic diagram of a planetary gearbox according to an embodiment of this application is shown from another angle.

[0023] Figure 3A partial cross-sectional view of a partial structure of a planetary gearbox according to an embodiment of this application is shown.

[0024] Figure 4 It shows Figure 3 A magnified view of a portion of the image.

[0025] Figure 5 An exploded view of a partial structure of a planetary gearbox according to an embodiment of this application is shown.

[0026] Figure 6 A schematic diagram of the structure of an oil collector for a planetary gearbox according to an embodiment of this application is shown.

[0027] Figure 7 A schematic diagram of the structure of an oil collector for a planetary gearbox according to an embodiment of this application is shown.

[0028] Figure 8 A schematic diagram of the planet carrier of a planetary gearbox according to an embodiment of this application is shown.

[0029] Explanation of reference numerals in the attached figures

[0030] 1. Planetary carrier; 11. Planetary pin mounting hole; 12. Anti-rotation pin hole

[0031] 2 planetary gears, 21 gear bearings

[0032] 3 oil collectors

[0033] 31 Oil collecting trough; 311 Bottom wall; 312 Oil collecting wall; 313 Support wall; 314 Retaining wall; 315 Anti-rotation pin; 316 Oil collecting cavity

[0034] 32 oil guide column, 321 sealing ring, 322 internal thread, 323 oil inlet hole

[0035] 4 planetary pins; 41 oil reservoir; 42 oil outlet; 43 mounting protrusion.

[0036] 5 bolts

[0037] Axial direction C circumferential direction R radial direction Detailed Implementation

[0038] To more clearly illustrate the above-mentioned objectives, features, and advantages of this application, specific embodiments of this application are described in detail in conjunction with the accompanying drawings in this section. Besides the embodiments described in this section, this application can also be implemented in other different ways. Those skilled in the art can make corresponding improvements, modifications, and substitutions without departing from the spirit of this application; therefore, this application is not limited to the specific embodiments disclosed in this section. The scope of protection of this application should be determined by the claims.

[0039] In the following description, unless otherwise specified, axial direction A refers to the axial direction of the planet carrier, circumferential direction C refers to the circumferential direction of the planet carrier, and radial direction R refers to the radial direction of the planet carrier.

[0040] like Figures 1 to 8 As shown, embodiments of this application propose a planetary gearbox, which can be used in a vehicle powertrain, such as a coaxial electric axle drive unit. The planetary gearbox includes an oil collection assembly, planetary gears 2, and a housing. The oil collection assembly includes a planet carrier 1, an oil collector 3, planetary pins 4, and bolts 5.

[0041] It is understandable that the planetary gearbox here may, but does not necessarily, include gears or gear pairs other than planetary gear mechanisms.

[0042] Planet carrier 1 is used to support planet gear 2. Planet gear 2 is rotatably connected to planet carrier 1 relative to planet carrier 1. Multiple (e.g., 3) planet gears 2 can be provided along the circumferential direction C of planet carrier 1. For example, planet gear 2 can be a double gear. The double gear can include a large diameter gear and a small diameter gear arranged coaxially.

[0043] The planetary carrier 1 can be provided with multiple planetary pin mounting holes 11, each containing one planetary pin 4. Multiple planetary pins 4 are connected to the planetary carrier 1, and planetary gears 2 can be fitted onto the planetary pins 4. The planetary pins 4 support the planetary gears 2. The planetary gears 2 and planetary pins 4 are connected by gear bearings 21 (e.g., needle roller bearings), which are fitted onto the planetary pins 4. Oil collectors 3 can be connected to the planetary pins 4, with each planetary pin 4 having an independent oil collector 3. Multiple oil collectors 3 are arranged at intervals along the circumference C of the planetary carrier 1. Specifically, there can be three planetary pins 4 and three oil collectors 3. The multiple oil collectors 3 are independent and identical. The spaced-apart oil collectors 3 are suitable for planetary gear systems with different center distances, offering strong adaptability and saving materials, reducing costs, and lightening weight. Each oil collector 3 can be manufactured using the same mold, resulting in lower mold costs.

[0044] like Figure 3 , Figure 4 , Figure 6 and Figure 7 As shown, the oil collector 3 includes an oil collecting groove 31 and an oil guide column 32. The oil guide column 32 is a hollow circular tube. The oil collecting groove 31 has an oil collecting chamber 316 for collecting oil. The oil collecting chamber 316 has an opening radially inward toward the planetary carrier 1. Oil agitated by the planetary gear 2 or other gears in the gearbox can enter the oil collecting chamber 316 through the opening. The oil collecting groove 31 can be connected to one axial end of the oil guide column 32. Figure 3 and Figure 4The left end of the guide column 32 connects the oil guide column 32 and the oil collection cavity 316 of the oil collection groove 31, and the other axial end of the guide column 32 ( Figure 3 and Figure 4 The right end of the device can be provided with an internal thread 322. The oil collector 3 is fixedly connected to the planetary pin 4 by the engagement of the bolt 5 and the internal thread 322.

[0045] The oil collector 3 and planetary pin 4 are connected by bolts 5. The oil collector 3 is easy to disassemble and is not easily damaged even with repeated disassembly. Furthermore, the bolted connection structure has better temperature adaptability. Compared with the use of interference fit, there is no problem of the interference amount changing with temperature, making it easier to assemble and less prone to problems such as loose connection and cracking of parts.

[0046] Optionally, the oil collection groove 31 is located at the axial end of the planetary carrier 1, for collecting oil stirred up by the planetary gear 2 or other gears in the gearbox. Optionally, on the axial direction A of the planetary carrier 1, the oil collection groove 31 can be located on the side of the gear with the larger radial dimension (larger diameter gear) in the double gear set. Figure 3 (On the left side of the image), the gear with a larger radial dimension stirs up more oil, so the oil collection tank 31 can collect more oil.

[0047] The oil collection tank 31 includes a bottom wall 311, an oil collection wall 312, a support wall 313, two retaining walls 314, and an anti-rotation pin 315.

[0048] The bottom wall 311, the oil collecting wall 312, the supporting wall 313, and the two retaining walls 314 form the oil collecting cavity 316 of the oil collecting groove 31. The oil collecting wall 312, the supporting wall 313, and the retaining walls 314 are all connected to the bottom wall 311. The bottom wall 311 can be a V-shaped or arc-shaped sheet, and the oil guide column 32 can be located at the tip of the V-shape or the middle of the arc.

[0049] The oil collecting wall 312 and the support wall 313 are arranged opposite to each other. The oil collecting wall 312 and the support wall 313 can be respectively connected to the two ends of the bottom wall 311 along the axial direction A of the planetary carrier 1. The support wall 313 is closer to the planetary carrier 1 than the oil collecting wall 312. The cross-section of the oil collecting groove 31 can be U-shaped, wherein the bottom wall 311 forms the bottom of the U, and the oil collecting wall 312 and the support wall 313 form the wall portion of the U. Two retaining walls 314 can be respectively connected to the two ends of the bottom wall 311 along the circumferential direction C of the planetary carrier 1. The retaining wall 314 and the bottom wall 311 can form an angle, for example, greater than 80 degrees and less than 180 degrees. Furthermore, the extending direction of the retaining wall 314 can be parallel (including approximately parallel) to the radial direction R of the planetary carrier 1. The retaining wall 314 can block and slow down the flow of oil in the oil collecting cavity 316 out of the oil collecting cavity 316 as the planetary carrier 1 rotates. It is understandable that without the retaining wall 314, the oil in the oil collecting chamber 316 could flow out along the bottom wall 311 if the angle of the oil collector 3 is such that (for example) Figure 1 The two oil collectors located at the bottom of the oil collection chamber 316 are prone to leakage of oil. The retaining wall 314 and the bottom wall 311 of this application form a certain angle, which can block the oil that originally flowed out along the bottom wall 311, thereby reducing or slowing down the flow of oil out of the oil collection chamber 316.

[0050] It is understandable that, since the planetary carrier 1 is rotating in many cases, the oil tends to collect near the oil guide column 32 under the action of centrifugal force, and the retaining wall 314 is not necessary.

[0051] like Figure 3 and 4 As shown, the planetary pin 4 can be a hollow cylindrical tube, and the oil guide column 32 can be inserted into the planetary pin 4. The outer diameter of the main body of the oil guide column 32 is smaller than the inner diameter of the planetary pin 4, thereby forming an oil reservoir 41 between the outer circumferential surface of the oil guide column 32 and the inner circumferential surface of the planetary pin 4.

[0052] The oil guide column 32 may be provided with an oil inlet hole 323, which can penetrate the peripheral wall of the oil guide column 32. The oil collected in the oil collecting chamber 316 can flow into the oil storage chamber 41 through the oil inlet hole 323.

[0053] The planetary pin 4 has a mounting protrusion 43 on its inner side. The mounting protrusion 43 protrudes radially inward from the inner circumference of the planetary pin 4, and the mounting protrusion 43 can be annular. The bolt 5 can pass through the mounting protrusion 43 and be screwed into the internal thread 322 of the oil guide column 32, thereby connecting the oil collector 3 to the planetary pin 4. Through the preload applied to the oil guide column 32 by the bolt 5, the support wall 313 can be tightly attached to one end face of the planetary carrier 1. Figure 3 and Figure 4 (Left end face of the middle). Bolt 5 is completely housed inside the hollow planetary pin 4, so that bolt 5 does not add extra axial dimension to the oil collection assembly.

[0054] The oil guide column 32 may be equipped with a sealing ring 321, which may protrude from the outer circumferential surface of the main body of the oil guide column 32. The sealing ring 321 is located at the connection between the oil guide column 32 and the support wall 313. The outer diameter of the sealing ring 321 is the same as the inner diameter of the planetary pin 4, and a seal is formed through dimensional fit to prevent oil leakage in the oil reservoir 41.

[0055] Here, the sealing ring 321 can be integrally formed with the oil guide column 32, or it can be a separate part fitted onto the oil guide column 32.

[0056] The planetary pin 4 may have an oil outlet hole 42 on its peripheral wall, which may penetrate the peripheral wall of the planetary pin 4. In the axial direction A, the oil outlet hole 42 may be aligned with the gear bearing 21 (including aligning with the gaps between multiple gear bearings, ensuring that the oil flowing from the oil outlet hole 42 can lubricate the gear bearing). The oil outlet hole 42 allows the oil in the oil reservoir 41 to flow to the gear bearing 21 for lubrication.

[0057] As the planetary carrier 1 rotates, when the opening of the oil collecting chamber 316 faces downwards (e.g.) Figure 1 The oil collector located at the top ensures that even if the oil collected in the oil collection chamber 316 flows out, the oil in the oil storage chamber 41 will not easily leak, and can still provide lubrication for the gear bearing 21, so that the gear bearing is in good working condition and has a long service life.

[0058] like Figures 5 to 8 As shown, the end face of the planetary carrier 1 is provided with an anti-rotation pin hole 12 (anti-rotation mating part), and the support wall 313 is provided with an anti-rotation pin 315 (anti-rotation part). The anti-rotation pin 315 can protrude from the support wall 313 toward the planetary carrier 1. The anti-rotation pin 315 can be inserted into the anti-rotation pin hole 12 (anti-rotation part and anti-rotation mating part cooperate), thereby preventing the oil collector 3 from rotating relative to the planetary carrier 1 around the oil guide column 32.

[0059] When the planetary gearbox is running normally, both planetary gear 2 and planet carrier 1 rotate. Planetary gear 2 or other gears in the gearbox can agitate and splash the oil at the bottom of the gearbox to the oil collection chamber 316. The oil in the oil collection chamber 316 flows into the oil guide column 32, flows into the oil storage chamber 41 from the oil inlet 323, and then flows to the gear bearing 21 through the oil outlet 42 to provide lubrication for the gear bearing 21.

[0060] The oil collecting assembly and planetary gearbox of this application have the following beneficial effects.

[0061] (1) Multiple oil collectors 3 are arranged at intervals along the circumferential direction C of the planetary carrier, so that oil collectors 3 of the same specification can be used for planetary gear systems with different center distances, which has strong adaptability and can save materials, reduce mold costs and reduce weight.

[0062] (2) The oil collector 3 is fixedly connected to the planetary pin 4 by the engagement of bolt 5 and internal thread 322. The oil collector 3 is easy to disassemble and is not easily damaged even with repeated disassembly. Compared with the snap-fit ​​installation of the oil collector 3, it is less likely to generate fragments during installation, and has less impact on the cleanliness of the oil. Compared with the use of interference fit installation, there is no problem of interference amount changing with temperature. The bolt connection structure is easier to assemble and less likely to have problems such as loose connection and cracking of parts.

[0063] (3) The retaining wall 314 can block and slow down the flow of oil in the oil collecting chamber 316 as the planetary carrier 1 rotates out of the oil collecting chamber 316.

[0064] (4) The oil in the oil reservoir 41 is not easy to leak, and can continuously provide lubrication for the gear bearing 21, so that the gear bearing is in good working condition and has a long service life.

[0065] This application is not limited to the above embodiments. Those skilled in the art can make various modifications to the above embodiments of this application under the guidance of this application, without departing from the scope of this application. In addition, the following description is provided.

[0066] (1) In the above embodiment, the anti-rotation part is a raised anti-rotation pin 315 and the anti-rotation mating part is an anti-rotation pin hole 12. However, this application is not limited to this. In other possible embodiments, the anti-rotation part can be in the form of a hole and the anti-rotation mating part can be in the form of a raised part.

[0067] (2) It can be understood that the mounting protrusion 43 can be continuous in the circumferential direction of the planetary pin to form a ring, or it can be multiple discontinuous protrusions. The mounting protrusion can hold the head of the bolt.

[0068] It should be understood that at least some aspects or features of the above-described implementation methods, embodiments, or examples can be appropriately combined.

[0069] It is understood that, in this application, when the number of parts or components is not specifically limited, the number can be one or more, where multiple refers to two or more. For cases where the number of parts or components shown in the drawings and / or described in the specification is, for example, two, three, four, etc., this specific number is generally exemplary and not restrictive, and can be understood as multiple, i.e., two or more; however, this does not mean that this application excludes the case of one.

[0070] In this application, unless otherwise expressly stated or limited, terms such as "installation," "assembly," "connection," "linking," "joining," "linking," "abutment," "communication," "connection," "conduction," "fixing," and "fastening" should be interpreted broadly, for example, they can be direct or indirect. For instance, regarding connection, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal communication of two components or the interaction between two components, unless otherwise expressly stated or limited. For instance, regarding communication / conduction, it can be direct communication / conduction or indirect communication / conduction through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0071] In this application, unless otherwise expressly stated or limited, a component being disposed / installed / located / enclosed / placed within, inside, or incorporated in another component can be either of the following two situations: a portion or a majority of the one component is located within the other component; or the one component is completely enclosed within the other component.

[0072] Although the present application has been described in detail using the above embodiments, it will be apparent to those skilled in the art that the present application is not limited to the embodiments described herein. The present application can be modified and implemented as alternative embodiments without departing from the spirit and scope of the present application as defined by the claims. Therefore, the description in this specification is for illustrative purposes only and does not have any limiting meaning for the present application.

Claims

1. An oil collection assembly for a planetary gearbox, characterized by, The oil collecting assembly comprises: a planet carrier for supporting a plurality of planet gears; a plurality of planet pins connected to the planet carrier, the planet pins being hollow and tubular, the planet pins being used for supporting the planet gears; and a plurality of oil collectors arranged at intervals along the circumference of the planet carrier, the oil collectors comprising an oil collecting groove and an oil guide column, the oil guide column being inserted into and connected to the planet pin, the oil collecting groove having an oil collecting cavity for collecting oil, the oil collecting cavity having an opening towards the radially inner side of the planet carrier, the oil collecting groove being arranged at an axial end of the oil guide column, the oil collecting cavity and the oil guide column being in communication. The outer diameter of the main body portion of the oil guide column is smaller than the inner diameter of the planet pin, and an oil storage chamber is formed between the outer circumferential surface of the oil guide column and the inner circumferential surface of the planet pin.

2. An oil collection assembly for a planetary gearbox according to claim 1, characterized in that, The oil guide column is provided with a sealing ring protruding from the outer circumferential surface of the main body portion of the oil guide column, the outer diameter of the sealing ring being the same as the inner diameter of the planet pin, thereby sealing the oil storage chamber.

3. An oil collection assembly for a planetary gearbox according to claim 2, characterized in that, The oil collecting groove comprises a bottom wall and two retaining walls connected to the bottom wall at both ends in the circumferential direction of the planet carrier.

4. An oil collection assembly for a planetary gearbox according to claim 1, characterized in that, The extending direction of the retaining walls is parallel to the radial direction of the planet carrier.

5. An oil collection assembly for a planetary gearbox according to claim 4, characterized in that, The oil collecting assembly further comprises a bolt, the inner side of the planet pin is provided with a mounting protrusion protruding radially inward from the inner circumferential surface of the planet pin, the other axial end of the oil guide column is provided with an internal thread, the bolt is screwed into the internal thread through the mounting protrusion, thereby connecting the oil collector to the planet pin.

6. The oil collection assembly for a planetary gear box of claim 1, wherein, The bolt is completely accommodated inside the hollow planet pin.

7. An oil collection assembly for a planetary gearbox according to claim 6, characterized in that, The oil collecting groove is provided with an anti-rotation portion, and the end surface of the planet carrier is provided with an anti-rotation matching portion, the anti-rotation portion and the anti-rotation matching portion are matched, thereby preventing the oil collector from rotating around the oil guide column relative to the planet carrier.

8. The oil collection assembly for a planetary gear box of claim 1, wherein, The oil collecting assembly comprises:

9. A planetary gearbox, characterised in that, any one of claims 1 to 8; and a plurality of planet gears. The planet gears are double gears, the oil collecting groove is located at one axial side of the planet carrier, and in the axial direction of the planet carrier, the oil collecting groove is located at the side of the gear with a larger radial dimension among the double gears.

10. A planetary gearbox as claimed in claim 9, characterised in that, ​

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