Planetary reducer and electric driving system

Abstract

The invention provides a planetary reducer and an electric driving system. The electric driving system is provided with a planetary reducer; the planetary reducer comprises a planet wheel, a planet carrier, a gear ring and a first oil ring; the first oil ring is positioned on one axial side of the gear ring and is coaxially and fixedly connected with the planet carrier; a first oil way is arranged in the first oil ring, an oil guide structure communicated with the first oil way is further arranged on the first oil ring, and the oil guide structure extends towards the gear ring so as to spray lubricating oil to the meshing face of the gear ring and the planet wheel. Therefore, the meshing surface of the planet gear and the gear ring is well lubricated, the service life of the gear ring and the planet gear is prolonged, and the failure risk of a transmission system is reduced.

Description

Technical Field

[0001] This application belongs to the field of planetary gear reducers, and more specifically, relates to a planetary gear reducer and an electric drive system. Background Technology

[0002] The electric drive systems of new energy vehicles are undergoing a technological upgrade from parallel shaft reducers to planetary reducers. Planetary reducers offer advantages such as small size, light weight, and high power density, significantly reducing the size of electric drive systems. However, the meshing surfaces of the planetary gears and the ring gear revolve with the planetary gears; when the planetary gears rotate to a higher position, the bottom lubricating oil cannot properly lubricate the gear surfaces, leading to damage due to poor lubrication and ultimately causing transmission system failure. Therefore, it is necessary to improve the lubrication method of planetary reducers. Summary of the Invention

[0003] The purpose of this application is to provide a planetary reducer and an electric drive system, which aims to improve the lubrication method of the planetary gears and achieve good lubrication of the meshing surfaces of the planetary gears and the ring gear.

[0004] To achieve the above objectives, this application provides a planetary reducer, including planetary gears, a planet carrier, and a ring gear, and further comprising:

[0005] The first oil ring is located on one axial side of the gear ring and is coaxially and fixedly connected to the planetary carrier;

[0006] The first oil ring has a first oil passage inside, and the first oil ring also has an oil guiding structure that communicates with the first oil passage. The oil guiding structure extends toward the gear ring to spray lubricating oil onto the meshing surface of the gear ring and the planetary gear.

[0007] In some embodiments, the oil guiding structure extends to the inside of the gear ring and is located on the meshing side of the planetary gear.

[0008] In some embodiments, the number of the oil guiding structures is the same as the number of the planetary gears, and / or, the first oil ring is disposed on the input shaft side of the planetary reducer.

[0009] In some embodiments, the first oil passage is a continuous and closed loop, with the inner peripheral side of the first oil passage being open.

[0010] In some embodiments, the first oil ring is snap-fitted or bolted to the planetary carrier.

[0011] In some embodiments, the planetary reducer further includes:

[0012] The second oil ring is located on the other side of the axial direction of the gear ring and is fixedly connected to the planetary carrier coaxially.

[0013] A planetary shaft is used to mount the planetary gears, and the two axial ends of the planetary shaft are fixedly connected to the first oil ring and the second oil ring, respectively.

[0014] The second oil ring has a second oil passage inside; the planetary shaft has an axially extending inner hole; the second oil passage, the inner hole of the planetary shaft, and the first oil passage are connected in sequence.

[0015] In some embodiments, the second oil passage is a continuous and closed loop, with the inner circumferential side of the second oil passage being open.

[0016] In some embodiments, the second oil ring is snap-fitted or bolted to the planetary carrier.

[0017] In some embodiments, the first oil ring has a first interface on the side near the gear ring, the first interface being connected to the first oil passage and the inner hole of the planetary shaft, and the first interface being inserted into one axial end of the planetary shaft for fixation; and / or, the second oil ring has a second interface on the side near the gear ring, the second interface being connected to the second oil passage and the inner hole of the planetary shaft, and the second interface being inserted into the other axial end of the planetary shaft for fixation.

[0018] To achieve the above objectives, this application also provides an electric drive system equipped with any of the planetary reducers described in the previous application.

[0019] As described above, this application provides a planetary reducer. By adding a first oil ring to one axial side of the gear ring, lubricating oil can be collected directly or indirectly through a first oil passage on the first oil ring. Lubricating oil can then be sprayed onto the meshing surfaces of the gear ring and planetary gears through the oil guiding structure on the first oil ring. With this configuration, even when the planetary gears rotate to a high position, lubricating oil can still be supplied to the meshing surfaces of the planetary gears and gear ring through the oil guiding structure, preventing damage to the meshing surfaces due to poor lubrication. This improves the service life of the planetary gears and gear ring, and reduces the risk of transmission system failure.

[0020] Since the electric drive system provided in this application and the planetary reducer provided in this application belong to the same inventive concept, the electric drive system provided in this application has at least all the advantages of the planetary reducer provided in this application, and will not be repeated here. Attached Figure Description

[0021] The accompanying drawings are provided to better understand this application and do not constitute an undue limitation thereof. Wherein:

[0022] Figure 1 A schematic diagram of a planetary speed reducer;

[0023] Figure 2 This is a schematic diagram of the structure of a planetary reducer provided in some embodiments of this application. Figure 2The middle arrow indicates the direction of lubricant flow;

[0024] Figure 3 A front view of a lubrication structure provided in some embodiments of this application;

[0025] Figure 4 for Figure 2 A partially enlarged structural diagram of region D (circled in dashed circle) of the planetary reducer. Figure 4 The middle arrow A1 indicates the injection direction of the oil guide structure;

[0026] Figure 5 A front view of a first oil ring provided for some embodiments of this application;

[0027] Figure 6 for Figure 5 Side view of the first oil ring in the middle;

[0028] Figure 7 A front view of the second oil ring provided for some embodiments of this application;

[0029] Figure 8 for Figure 7 Side view of the second oil ring.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1-Sun gear, 2-Planet gear, 3-Ring gear, 2A-Meshing surface, 4-Planet carrier, 11-First oil ring, 111-First oil passage, 112-Oil guide structure, 113-First snap-fit, 114-First interface, 12-Second oil ring, 121-Second oil passage, 122-Second snap-fit, 123-Second interface, 13-Planet shaft, 131-Inner hole. Detailed Implementation

[0032] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. This application can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of this application. Therefore, the illustrations only show components related to this application and are not drawn according to the actual number, shape, and size of components in the actual implementation. In the actual implementation, the type, quantity, and proportion of each component can be arbitrarily changed, and the component layout may also be more complex.

[0033] Furthermore, while each embodiment described below possesses one or more technical features, this does not imply that users of this application must simultaneously implement all technical features in any embodiment, or can only separately implement some or all technical features in different embodiments. In other words, where implementation is possible, those skilled in the art can selectively implement some or all of the technical features in any embodiment, or selectively implement a combination of some or all of the technical features in multiple embodiments, based on the disclosure of this application and depending on design specifications or implementation requirements, thereby increasing the flexibility in implementing this application.

[0034] As used herein, the singular forms “a,” “an,” and “the” include plural objects, and the plural form “multiple” includes two or more objects, unless otherwise expressly indicated. As used herein, the term “or” is generally used to include the meaning of “and / or,” unless otherwise expressly indicated, and the terms “installed,” “connected,” and “linked” should be interpreted broadly, for example, as a fixed connection, a detachable connection, or an integral connection. Connections can be mechanical or electrical. Connections can be direct or indirect through an intermediate medium, and can be internal communication between two elements or an interaction between two elements. Relational terms such as “first,” “second,” etc., are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations, nor do they indicate or imply relative importance or implicitly specify the number of indicated technical features. It should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0035] Figure 1 This is a schematic diagram of a planetary speed reducer. Figure 1As shown, the planetary reducer includes a sun gear 1, planet gears 2, a ring gear 3, and a planet carrier (not visible in the figure). The sun gear 1 is located at the transmission center and is directly connected to the input shaft, serving as the core component for power input. Three planet gears 2 are evenly distributed around the sun gear 1 and mounted on the planet carrier via bearings, meshing with both the sun gear 1 and the ring gear 3. When power is input to the sun gear 1, the planet gears 2 revolve around the sun gear 1 on the planet carrier while simultaneously rotating on their own axes, thus achieving speed reduction and torque amplification through the fixation of the ring gear 3. The ring gear 3 has internal teeth that mesh externally with the planet gears 2, forming a closed-loop power transmission system. Due to the revolution of the planet gears 2, the meshing surfaces 2A between each planet gear 2 and the ring gear 3 also revolve with the planet gears 2. Consequently, when each planet gear 2 rotates to a higher position, no lubricating oil is available to lubricate the meshing surfaces 2A, leading to damage due to poor lubrication and causing the transmission system to fail.

[0036] Based on this research, this application provides a planetary reducer to solve the lubrication problem of the meshing surfaces of planetary gears.

[0037] Based on the planetary reducer provided in the embodiments of this application, the embodiments of this application also provide an electric drive system to improve the transmission efficiency and transmission performance of the electric drive system.

[0038] To make the objectives, advantages, and features of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings. It should be noted that the drawings are all in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of this application.

[0039] Figure 2 A schematic diagram of the planetary reducer provided in an embodiment of this application is shown. Figure 3 A front view of the lubrication structure provided in an embodiment of this application is shown. Figure 4 It shows Figure 2 A partially enlarged schematic diagram of the planetary reducer. Figure 5 A front view of the first oil ring 11 provided in an embodiment of this application is shown. Figure 6 for Figure 5 Side view of the first oil ring 11. Figure 7 A front view of the second oil ring 12 provided in an embodiment of this application is shown. Figure 8 for Figure 7 Side view of the second oil ring 12. (See below for reference.) Figures 2 to 8 The structure and implementation of the planetary reducer provided in the embodiments of this application will be described.

[0040] like Figures 2 to 4As shown, the planetary reducer, in addition to common structures such as the sun gear 1, planet gears 2, ring gear 3, and planet carrier 4, also includes a lubrication structure. This lubrication structure includes a first oil ring 11, a second oil ring 12, and a planetary shaft 13. Note that in some other embodiments, the second oil ring 12 may be omitted.

[0041] The first oil ring 11 is located on one axial side of the gear ring 3 and is coaxially and fixedly connected to the planet carrier 4. The first oil ring 11 and the planet carrier 4 can be connected by various mechanical connection methods understood by those skilled in the art, such as snap-fit ​​connection, bolt connection, welding, riveting, interference fit, etc., and this application is not limited in this regard. For example, in some embodiments, the first oil ring 11 is snap-fit ​​connected to the planet carrier 4. In other embodiments, the first oil ring 11 is bolted to the planet carrier 4. The first oil ring 11 and the planet carrier 4 can be detachably or non-detachably fixedly connected, more preferably detachably fixedly connected.

[0042] When the planetary reducer is equipped with a second oil ring 12, the first oil ring 11 acts as an oil distributor and the second oil ring 12 acts as an oil collector. The oil collector directly collects the lubricating oil sprayed from the reducer housing (not shown) and then supplies lubricating oil to the first oil ring 11 through the planetary shaft 13.

[0043] When the planetary reducer is not equipped with a second oil ring 12, the first oil ring 11 acts as both an oil distributor ring and an oil collector ring. Therefore, the lubricating oil sprayed from the reducer housing is directly collected through the first oil ring 11, and there is no need to supply lubricating oil to the first oil ring 11 through the planetary shaft 13.

[0044] When the planetary reducer is equipped with a second oil ring 12, the second oil ring 12 is located on the opposite side of the axial direction of the gear ring 3 and is coaxially and fixedly connected to the planet carrier 4. That is, the first oil ring 11 and the second oil ring 12 are located on opposite sides of the axial direction of the gear ring 3, and are directly and fixedly connected to the planet carrier 4, maintaining a coaxial relationship. In other words, the two oil rings are coaxial with the planet carrier 4 and mounted on it. It should be noted that the central holes of both the first and second oil rings allow the central shaft of the planet carrier 4 or the planetary reducer to pass through, without affecting installation and use. Both the first and second oil rings 11 and 12 remain relatively fixed to the planet carrier 4 and rotate with the planet carrier 4.

[0045] The method of fixing the second oil ring 12 to the planet carrier 4 is not limited. In some embodiments, the second oil ring 12 is snap-fitted to the planet carrier 4. In other embodiments, the second oil ring 12 is bolted to the planet carrier 4. The second oil ring 12 and the planet carrier 4 are fixedly connected in a detachable or non-detachable manner, preferably in a detachable manner.

[0046] In one or more embodiments of this application, such as Figure 2 , Figures 4 to 6As shown, the first oil ring 11 has a first oil passage 111 inside, and an oil guiding structure 112 communicating with the first oil passage 111 is provided on the first oil ring 11. The oil guiding structure 112 extends towards the gear ring 3 and can spray lubricating oil onto the meshing surface 2A of the gear ring 3 and the planetary gear 2. This application does not limit the specific structure of the oil guiding structure 112. For example, the oil guiding structure 112 can be a nozzle with spray holes for spraying lubricating oil. The position and number of spray holes on the oil guiding structure 112 are not limited. For example, one or more spray holes are provided at the end of the oil guiding structure 112 away from the first oil ring 11, and / or one or more spray holes are provided on the side of the oil guiding structure 112. Alternatively, the oil guiding structure 112 can be directly set as an oil guiding channel, and the oil guiding channel sprays lubricating oil at the outlet. The oil guiding structure 112 can be of various shapes, and this is not limited.

[0047] In some embodiments, the first oil passage 111 is a continuous and closed loop, that is, the first oil passage 111 is arranged in a complete circle around the circumference of the first oil ring 11. In other embodiments, there are multiple first oil passages 111, which are arranged in segments along the circumference of the first oil ring 11 and are not interconnected with each other.

[0048] More preferably, when the first oil ring 11 is an oil collecting ring, the first oil passage 111 is a continuous and closed loop. With this configuration, during the rotational operation of the planetary reducer, the first oil passage 111 can continuously collect lubricating oil, ensuring sufficient real-time oil supply and achieving better lubrication.

[0049] When the second oil ring 12 is an oil collecting ring, in some embodiments, the first oil passage 111 is a continuous and closed loop, and in other embodiments, there are multiple first oil passages 111, which are segmented along the circumference of the first oil ring 11 and are not interconnected.

[0050] In some embodiments, such as Figure 2 , Figure 7 and Figure 8 As shown, when the second oil ring 12 is provided, the second oil ring 12 has a second oil passage 121 inside.

[0051] In some embodiments, the second oil passage 121 is a continuous and closed loop to continuously collect the lubricating oil sprayed from the reducer housing during rotational operation, resulting in better lubrication. In other embodiments, there are multiple second oil passages 121, which are segmented along the circumference of the second oil ring 12 and are not interconnected.

[0052] In some embodiments, such as Figure 2As shown, when the second oil ring 12 is provided, the planetary shaft 13 not only mounts the planetary gears 2, but also has an axially extending inner hole 131 inside, which serves as an oil passage. The inner hole 131 of the planetary shaft 13 can be centrally located or symmetrically distributed about the central axis of the planetary shaft 13.

[0053] In some embodiments, such as Figures 2 to 4 As shown, the two ends of the planetary shaft 13 are fixedly connected to the first oil ring 11 and the second oil ring 12, respectively. This arrangement enables the planetary shaft 13 to be connected to the planet carrier 4, as well as the two oil rings to be connected to the planet carrier 4, so that the planetary gear 2 revolves around the planet carrier 4 as the planet carrier 4 rotates, while the two oil rings rotate on their own axes as the planet carrier 4 rotates.

[0054] If there is no second oil ring 12, one axial end of the planetary shaft 13 is fixedly connected to the first oil ring 11, and the other axial end is fixedly connected to the planet carrier 4. Alternatively, both axial ends of the planetary shaft 13 are fixedly connected to the planet carrier 4.

[0055] The method of fixing the planetary shaft 13 to the first oil ring 11 and the second oil ring 12 is not limited, such as including but not limited to bolt connection, snap connection, etc., and more preferably a detachable fixing connection.

[0056] In some embodiments, the second oil passage 121, the inner bore 131 of the planetary shaft 13, and the first oil passage 111 are connected in sequence. It should be understood that if the second oil ring 12 is not provided, the planetary shaft 13 is retained for mounting the planetary gears 2, but the inner bore 131 of the planetary shaft 13 may be omitted or retained.

[0057] Therefore, in some embodiments, in the above planetary reducer, the lubricating oil sprayed from the reducer housing directly enters the second oil passage 121 of the second oil ring 12, then flows into the inner hole 131 of the planetary shaft 13, then enters the first oil passage 111 of the first oil ring 11, and finally is sprayed out through the oil guide structure 112 to achieve lubrication of the meshing surface 2A.

[0058] In other embodiments, in the above planetary reducer, the lubricating oil sprayed from the reducer housing directly enters the first oil passage 111 of the first oil ring 11, and then is sprayed out through the oil guide structure 112 to achieve lubrication of the meshing surface 2A.

[0059] It should be noted that the position of the first oil ring 11 or the second oil ring 12 collecting the lubricating oil sprayed from the reducer housing can be adjusted according to the oil spray position of the reducer housing.

[0060] In some embodiments, such as Figure 2As shown, when the second oil ring 12 is provided, the reducer housing sprays oil towards the second oil ring 12 along the first direction A, allowing the lubricating oil to enter the inner circumference of the second oil ring 12 through the gap and be stored in the second oil passage 121. In this case, the inner circumference of the second oil passage 121 is open and not closed. To achieve continuous oil supply, the second oil passage 121 is preferably designed as a continuous, closed loop. The first direction A is a direction parallel to the central axis of the planetary reducer.

[0061] In some embodiments, continue to refer to Figure 2 If the second oil ring 12 is not provided, the reducer housing sprays oil towards the first oil ring 11 along the second direction B, allowing lubricating oil to enter the inner circumference of the first oil ring 11 through the gap and be stored in the first oil passage 111. In this case, the inner circumference of the first oil passage 111 is open and not closed. To achieve continuous oil supply, the first oil passage 111 is preferably designed as a continuous, closed loop. The second direction B is parallel to the central axis of the planetary reducer, and the first direction A is opposite to the second direction B.

[0062] In some embodiments, such as Figure 2 and Figure 4 As shown, the oil guiding structure 112 extends to the inner region of the gear ring 3 and is located on the peripheral periphery of the planetary gear 2. In some other embodiments, the oil guiding structure 112 is located in the outer region of the gear ring 3 and does not enter the inner region of the gear ring 3; it only needs to approach the meshing surface 23A to spray lubricating oil.

[0063] The oil guiding structure 112 only needs to be located on the periphery of the planetary gear 2 to spray lubricating oil onto the meshing surface of the planetary gear 2 and the gear ring. Preferably, the oil guiding structure 112 is located on the meshing side of the planetary gear 2, which is the side where the planetary gear 2 enters the mesh. This allows lubricating oil to be sprayed onto the meshing side of the planetary gear 2, facilitating the lubricating oil to enter the meshing surface of the gear ring and the planetary gear 2 from the meshing side and then exit, resulting in better lubrication. Spraying oil on the meshing side ensures uniform oil coverage on the tooth surface, forming a continuous oil film, which effectively reduces friction and wear, lowers operating temperature, extends service life, and improves transmission efficiency.

[0064] The number of oil guiding structures 112 may be the same as or different from the number of planetary gears 2. In some embodiments, the number of oil guiding structures 112 is the same as the number of planetary gears 2. In other embodiments, the number of oil guiding structures 112 is greater than the number of planetary gears 2, that is, multiple oil guiding structures 112 can be configured for the same planetary gear 2. Therefore, each planetary gear 2 can be lubricated through at least one oil guiding structure 112. Preferably, the number of oil guiding structures 112 is the same as the number of planetary gears 2, that is, each planetary gear 2 is configured with only one oil guiding structure 112, thereby simplifying the structure and reducing the difficulty of implementation.

[0065] In the above planetary reducer, when the ring gear 3 is fixed, the planet gear 2 revolves around the sun gear 1 on the planet carrier 4 and rotates on its own axis. The planet carrier 4 rotates along with the sun gear 1, driving the first oil ring 11 or the first oil ring 11 and the second oil ring 12 to rotate. During this process, lubricating oil can be collected through the first oil ring 11 or the second oil ring 12 and finally distributed to the oil guide structure 112. The oil guide structure 112 lubricates the meshing surface 2A of the planet gear 2 and the ring gear 3 in real time. This structural design ensures good lubrication of the meshing surface 2A even when the planet gear 2 rotates to a higher position, thereby improving the service life of the ring gear 3 and the planet gear 2 and reducing the risk of transmission system failure.

[0066] In some embodiments, the first oil ring 11 is fixedly connected to the planetary carrier 4, forming at least three connection points, which are evenly distributed along the circumference of the first oil ring 11. In this embodiment, the first oil ring 11 and the planetary carrier 4 are snap-fitted together to form three connection points.

[0067] As an example, such as Figure 5 and Figure 6 As shown, and in combination Figure 3 As shown, the first oil ring 11 has three first buckles 113 on the side near the toothed ring 3. The three first buckles 113 are evenly distributed in the circumferential direction and do not interfere with the oil guiding structure 112.

[0068] In conjunction with, as an example, such as Figure 2 and Figure 4 As shown, the planetary carrier 4 is provided with three first snap-fit ​​through holes (not labeled), and the first snap-fit ​​113 is matched with the first snap-fit ​​through holes one by one. During assembly, simply inserting the first snap-fit ​​113 into the first snap-fit ​​through hole can achieve a fixed connection between the first oil ring 11 and the planetary carrier 4, and it can also be disassembled.

[0069] In some embodiments, the second oil ring 12 is fixedly connected to the planetary carrier 4, forming at least three connection points, which are evenly distributed around the circumference of the second oil ring 12. In this embodiment, the second oil ring 12 forms three connection points when it is snapped together with the planetary carrier 4.

[0070] As an example, such as Figure 7 and Figure 8 As shown, and in combination Figure 3 As shown, three second buckles 122 are provided on the side of the second oil ring 12 near the toothed ring 3, and the three second buckles 122 are evenly distributed in the circumferential direction.

[0071] In conjunction with, as an example, such as Figure 2 and Figure 4As shown, the planetary carrier 4 is provided with three second snap-fit ​​through holes (not labeled), and the second snap-fit ​​122 is matched with the second snap-fit ​​through holes one by one. During assembly, simply inserting the second snap-fit ​​122 into the second snap-fit ​​through hole can achieve a fixed connection between the second oil ring 12 and the planetary carrier 4, and it can also be disassembled.

[0072] It should be noted that the first and second buckle through holes are not overlapping and are set independently of each other.

[0073] In some embodiments, such as Figures 2 to 6 As shown, when the second oil ring 12 is provided, the first oil ring 11 also has a first interface 114 on the side near the gear ring 3, which is fixedly connected to one axial end of the planetary shaft 13. The first interface 114 has an inner cavity, which communicates with the first oil passage 111 and the inner hole 131 of the planetary shaft 13. The first interface 114 and the planetary shaft 13 can be fixedly connected in various ways, including but not limited to snap-fit ​​connection, bolt connection, etc.

[0074] As an example, the first interface 114 is inserted into one axial end of the planetary shaft 13 and fixedly connected to the planetary shaft 13, such as by a snap-fit. Alternatively, the axial end of the planetary shaft 13 is inserted into the first interface 114 for fixation.

[0075] Optionally, the first interface 114 can be designed as a notch to facilitate assembly. For example, in this embodiment, the first interface 114 is a semi-open cylindrical structure, and its notch surface can be a bevel. In other examples, the first interface 114 is a circumferentially closed cylindrical structure or other shapes.

[0076] In some embodiments, such as Figures 2-3 and such Figure 7 and Figure 8 As shown, the second oil ring 12 has a second interface 123 on the side near the gear ring 3, which is fixedly connected to the other axial end of the planetary shaft 13. Similar to the first interface 114, the second interface 123 has an inner cavity for guiding oil, and this cavity communicates with the second oil passage 121 and the inner hole 131 of the planetary shaft 13. The second interface 123 and the planetary shaft 13 can be fixedly connected in various ways, including but not limited to snap-fit ​​connections and bolt connections.

[0077] As an example, the second interface 123 is inserted into the other axial end of the planetary shaft 13 and fixedly connected to the planetary shaft 13, such as by a snap-fit. Alternatively, the configuration can be reversed, with the other axial end of the planetary shaft 13 inserted into the second interface 123 for fixation.

[0078] Optionally, the second interface 123 is designed as a slit, which facilitates assembly and improves the utilization rate of oil in the oil circuit. For example, in this embodiment, the second interface 123 is inserted as a semi-open cylindrical structure, and its slit surface can be set as a slope. In other examples, the second interface 123 is a circumferentially closed cylindrical structure or other shapes.

[0079] In some embodiments, such as Figure 2 As shown, the first oil ring 11 is located on the input shaft side of the planetary reducer, which is not easy to interfere with the surrounding structure, easy to implement, and highly feasible. The second oil ring 12 is located on the output shaft side of the planetary reducer, which facilitates the collection of lubricating oil.

[0080] In summary, the planetary reducer provided in this application embodiment directly collects the lubricating oil sprayed from the reducer housing through the first oil ring 11 or the second oil ring 12, and finally distributes the lubricating oil to the meshing surface 2A of the planetary gear 2 and the gear ring 3 through the oil guiding structure 112 on the first oil ring 11, so as to achieve good lubrication of the meshing surface 2A, which can improve the service life of the planetary gear 2 and the gear ring 3 and reduce the risk of transmission system failure.

[0081] A second aspect of this application also provides an electric drive system. For example... Figures 2 to 8 As shown, the electric drive system may include the planetary reducer provided in any embodiment of this application. This electric drive system is mainly used in new energy vehicles and is suitable for pure electric vehicles and hybrid electric vehicles.

[0082] The planetary reducer in the electric drive system is provided with a lubrication structure, which includes at least a first oil ring 11, and may further include a second oil ring 12 and a planetary shaft 13.

[0083] In some embodiments, when the planetary reducer in the electric drive system is not equipped with a second oil ring 12, the first oil ring 11 is used as an oil collecting ring and an oil distributing ring to directly collect the lubricating oil sprayed from the reducer housing and store the collected lubricating oil in the first oil passage 111. Under the action of centrifugal force, the lubricating oil in the first oil passage 111 is thrown into the oil guiding structure 112, and finally the oil guiding structure 112 sprays the lubricating oil to the meshing surface 2A of the gear ring 3 and the planetary gear 2 to achieve lubrication.

[0084] In other embodiments, when the planetary reducer in the electric drive system is equipped with a second oil ring 12, the first oil ring 11 is used as an oil distribution ring and the second oil ring 12 is used as an oil collection ring. The second oil ring 12 directly collects the lubricating oil sprayed from the reducer housing and stores the collected lubricating oil in the second oil passage 121. Under the action of centrifugal force, the lubricating oil in the second oil passage 121 is thrown into the planetary shaft 13, and then the planetary shaft 13 delivers the lubricating oil to the first oil passage 111. Similarly, under the action of centrifugal force, the lubricating oil in the first oil passage 111 is thrown into the oil guide structure 112, and finally the oil guide structure 112 sprays the lubricating oil to the meshing surface 2A of the gear ring 3 and the planetary gear 2 to achieve lubrication.

[0085] In summary, the electric drive system provided in this application includes a planetary reducer with a lubrication structure. The lubricating oil sprayed from the reducer housing can be directly collected by the first oil ring 11 or the second oil ring 12, and then the lubricating oil is distributed to the meshing surface 2A of the planetary gear 2 and the gear ring 3 through the oil guiding structure 112 of the first oil ring 11, so as to achieve good lubrication of the meshing surface 2A, thereby improving transmission efficiency and transmission performance.

[0086] While this application discloses the above, it is not limited thereto. Those skilled in the art can make various modifications and variations to this application without departing from its spirit and scope. Therefore, this application also intends to include any modifications and variations that fall within the scope of this application's specification and its equivalents.

Claims

1. A planetary reducer, comprising planetary gears, a planet carrier, and a ring gear, characterized in that, Also includes: The first oil ring is located on one axial side of the gear ring and is coaxially and fixedly connected to the planetary carrier; The first oil ring has a first oil passage inside, and the first oil ring also has an oil guiding structure that communicates with the first oil passage. The oil guiding structure extends toward the gear ring to spray lubricating oil onto the meshing surface of the gear ring and the planetary gear.

2. The planetary reducer according to claim 1, characterized in that, The oil guiding structure extends to the inner side of the gear ring and is located on the meshing side of the planetary gear.

3. The planetary reducer according to claim 1, characterized in that, The number of oil guiding structures is the same as the number of planetary gears, and / or the first oil ring is disposed on the input shaft side of the planetary reducer.

4. The planetary reducer according to claim 1, characterized in that, The first oil circuit is a continuous and closed loop, and the inner circumference of the first oil circuit is open.

5. The planetary reducer according to claim 1, characterized in that, The first oil ring is snap-fitted or bolted to the planetary carrier.

6. The planetary reducer according to claim 1, characterized in that, Also includes: The second oil ring is located on the other side of the axial direction of the gear ring and is fixedly connected to the planetary carrier coaxially. A planetary shaft is used to mount the planetary gears, and the two axial ends of the planetary shaft are fixedly connected to the first oil ring and the second oil ring, respectively. The second oil ring has a second oil passage inside; the planetary shaft has an axially extending inner hole; the second oil passage, the inner hole of the planetary shaft, and the first oil passage are connected in sequence.

7. The planetary reducer according to claim 6, characterized in that, The second oil circuit is a continuous and closed loop, with its inner circumference open.

8. The planetary reducer according to claim 6, characterized in that, The second oil ring is connected to the planetary carrier by a snap-fit ​​or bolt.

9. The planetary reducer according to claim 6, characterized in that, The first oil ring has a first interface on the side near the gear ring, the first interface is connected to the first oil passage and the inner hole of the planetary shaft, and the first interface is inserted into one axial end of the planetary shaft for fixation; and / or, the second oil ring has a second interface on the side near the gear ring, the second interface is connected to the second oil passage and the inner hole of the planetary shaft, and the second interface is inserted into the other axial end of the planetary shaft for fixation.

10. An electric drive system, characterized in that, It is equipped with a planetary reducer as described in any one of claims 1-9.

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