A planetary carrier and planetary carrier assembly

Abstract

The utility model discloses a kind of planetary gear carrier and planetary gear carrier assembly, it includes: support shaft, support shaft is metal material, along the axial direction of support shaft, support shaft includes boss, installation part, output part;Multiple planet shafts, planet shaft is metal material, multiple planet shafts are set apart along the circumferential direction of support shaft, every planet shaft includes connecting part and transmission part;Non-metallic planet carrier body, by injection molding mode and be formed on the outer periphery of installation part and connecting part;Along axial direction, non-metallic planet carrier body has upper end face and lower end face;Wherein, transmission part protrudes on upper end face;Output part protrudes on lower end face, boss protrudes on upper end face.The utility model can solve the problem that planet gear carrier is complicated in prior art, assembly complex and too heavy.

Description

Technical Field

[0001] This utility model relates to the field of mechanical transmission technology, and in particular to a planetary gear carrier and a planetary gear carrier assembly. Background Technology

[0002] The planetary gear carrier is the core component of a planetary gear transmission system. Its main function is to serve as the carrier and positioning reference for the planetary gears and the sun gear. The planetary shafts are fixed to the planetary gear carrier, and the planetary gears are clearance-fitted with the planetary shafts. This ensures that all planetary gears maintain a uniform spacing and accurate phase relationship during operation, thereby maintaining stable meshing with the central sun gear.

[0003] Currently, most widely used planetary gear carriers employ a monolithic metal structure, formed through casting and subsequent machining, before the planetary shafts are assembled onto the metal planetary gear carrier. While this metal structure ensures structural strength and rigidity, its manufacturing process is cumbersome and time-consuming. Even after casting, multiple machining operations (such as turning, milling, drilling, and grinding) are required to achieve the required precision, resulting in low production efficiency and high energy consumption. Furthermore, the planetary shafts are typically assembled as independent parts using press-fitting or fastening methods, which not only adds extra machining but also easily accumulates errors leading to positional deviations in the planetary gears. Moreover, the metal planetary gear carrier results in heavy components, high material costs, and a significant increase in system rotational inertia, which is detrimental to vehicle lightweighting, energy consumption reduction, and improved power response performance, making it difficult to meet the demands of high-efficiency, high-dynamic applications such as new energy vehicles. Therefore, there is an urgent need for a lightweight planetary gear carrier with a simple manufacturing process that allows for integrated planetary shaft assembly. Utility Model Content

[0004] The purpose of this utility model is to solve the problems of cumbersome manufacturing, complex assembly, and excessive weight of planetary gear carriers in the existing technology.

[0005] To solve the above-mentioned technical problems, this utility model discloses a planetary gear carrier, comprising: a support shaft, which is made of metal and includes a boss, a mounting portion, and an output portion along its axial direction; a plurality of planetary shafts, which are also made of metal and are spaced apart circumferentially along the support shaft, each planetary shaft including a connecting portion and a transmission portion; and a non-metallic planetary carrier body, which is injection molded onto the outer periphery of the mounting portion and the connecting portion; along the axial direction, the non-metallic planetary carrier body has an upper end face and a lower end face; wherein the transmission portion protrudes from the upper end face; the output portion protrudes from the lower end face; and the boss protrudes from the upper end face.

[0006] By employing the above technical solution, the metal mounting portion and metal connecting portion are used as metal inserts. These inserts are then encapsulated and injection molded into a non-metallic planetary carrier body. Specifically, this is an insert molding injection method, forming a planetary gear carrier that integrates dissimilar materials. Compared to metal planetary carriers, the manufacturing process of planetary gear carriers is simpler, requiring no additional processing steps. It is formed in a single injection molding process and achieves lightweight design. The non-metallic planetary carrier body is made of non-metallic materials such as plastics, rubber, ceramics, and new composite materials. Furthermore, the injection molding process ensures seamless integration between components, eliminating assembly errors.

[0007] According to another specific embodiment of the present invention, a planetary gear carrier is disclosed, wherein the edge of the mounting part is provided with a plurality of protrusions, and a groove is formed between adjacent protrusions.

[0008] By employing the above technical solution, multiple protrusions are provided on the edge of the mounting portion, with grooves formed between adjacent protrusions. After injection molding, a non-metallic planetary carrier body is formed that interlocks with the protrusions and grooves of the mounting portion. This further achieves circumferential positioning of the mounting portion. Compared to a smooth edge bonding method, it can suppress relative rotation between the mounting portion and the non-metallic planetary carrier body. In addition, the structure of the protrusions and grooves increases the bonding area, thereby enhancing the bonding force of the injection molding and making the two more firmly bonded.

[0009] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a planetary gear carrier, wherein the planetary shaft is directly opposite the groove and is spaced apart from the groove along the radial direction of the mounting portion.

[0010] By adopting the above technical solution, the design of the planetary shaft facing the groove increases the injection area between the mounting part and the planetary shaft compared to the design of the protrusion facing the planetary shaft, thereby enhancing the local structural strength of the non-metallic planetary carrier body formed by injection molding.

[0011] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a planetary gear carrier, wherein the outer periphery of the connecting part is provided with at least one groove, and the groove extends circumferentially along the planetary axis.

[0012] By employing the above technical solution, a circumferentially extending groove is formed on the outer periphery of the metal connecting part. The connecting part acts as an insert, and during the injection molding process, the injection molding material is embedded and solidified within the groove. This creates a mechanical interlock between the non-metallic planetary carrier body and the planetary shaft, preventing axial displacement or loosening of the planetary shaft relative to the non-metallic planetary carrier body under stress. Simultaneously, it increases the effective connection area, enhances the tightness of the non-metallic planetary carrier body's coverage of the planetary shaft, and strengthens the injection molding bond, resulting in a more robust bond between the two.

[0013] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a planetary gear carrier, wherein the boss is conical and the diameter of the boss gradually decreases from the lower end face to the upper end face.

[0014] By adopting the above technical solution, the boss is designed in a conical shape, with its diameter gradually decreasing from the lower end face to the upper end face. When the sun gear is fitted onto the boss, the natural guiding effect of the conical surface can guide the sun gear to be aligned and installed.

[0015] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a planetary gear carrier, wherein the upper surface of the mounting portion is lower than the upper end face along the axial direction.

[0016] Using the above technical solution, the sun gear is sleeved on the boss and forms a clearance fit with the boss. By making the upper surface of the mounting part axially lower than the upper end face of the non-metallic planetary carrier body, a certain axial clearance is formed between the lower surface of the sun gear and the upper surface of the mounting part. This axial clearance provides a buffer space for the sun gear to move axially towards the lower end face under vibration conditions, avoiding contact between the lower surface of the sun gear and the non-metallic planetary carrier body and the mounting part, thereby effectively preventing abnormal noise or jamming caused by contact. Even if part of the lower surface of the sun gear contacts the upper end face, it will not contact the mounting part. This axial clearance reduces the actual contact area between the lower surface and the upper end face of the sun gear, effectively reducing frictional resistance and wear. According to another specific embodiment of this utility model, this utility model discloses a planetary gear carrier, wherein the end of the transmission part away from the connecting part is provided with a first chamfer; and the end of the boss away from the mounting part is provided with a second chamfer.

[0017] By adopting the above technical solution, and by setting the first chamfer and the second chamfer, the precise alignment and smooth introduction of the planetary gear and the planetary shaft, as well as the sun gear and the boss, are achieved during the assembly process. This effectively avoids scratches, jamming, or damage to the mating surfaces caused by interference from sharp corners during assembly, thereby improving assembly efficiency and ensuring the service life of the planetary gear and the sun gear.

[0018] According to another specific embodiment of the present invention, an embodiment of the present invention discloses a planetary gear carrier, wherein the sidewall of the non-metallic planetary carrier body is provided with an outwardly extending flange along the circumferential direction, and the top surface of the flange is flush with the upper end surface along the axial direction.

[0019] By adopting the above technical solution, by setting a flange along the circumferential direction on the side wall of the non-metallic planetary carrier body, and the top surface of the flange is flush with the upper end face, the position of the upper end face of the non-metallic planetary carrier body can be located by the position of the protruding flange. When the non-metallic planetary carrier body is installed in other structures, such as gearboxes, the flange can also be stably fitted with a preset shoulder or groove to achieve limiting and fixing.

[0020] The present invention also discloses a planetary gear carrier assembly, comprising the planetary gear carrier described in any of the above embodiments; a sun gear, which is sleeved on a boss in the planetary gear carrier and has a clearance fit with at least a portion of the boss; and a plurality of planetary gears, each planetary gear being sleeved on a corresponding transmission part in the planetary gear carrier and having a clearance fit with the transmission part, wherein the planetary gear meshes with the sun gear. Attached Figure Description

[0021] Figure 1 A perspective view of a planetary gear carrier according to an embodiment of the present invention is shown;

[0022] Figure 2 An exploded view of the planetary gear carrier according to an embodiment of the present invention is shown;

[0023] Figure 3 Show Figure 1 The planetary gear carrier shown is a cross-sectional view along the AA direction;

[0024] Figure 4 A perspective view of the support shaft according to an embodiment of the present invention is shown;

[0025] Figure 5 A perspective view of the support shaft including the tapered boss is shown;

[0026] Figure 6 A perspective view of the planetary axis according to an embodiment of the present invention is shown;

[0027] Figure 7 A perspective view of the planetary gear carrier assembly according to an embodiment of the present invention is shown;

[0028] Figure 8 Show Figure 7 The planetary gear carrier assembly shown is in cross-section along the BB direction. Figure 1 ;

[0029] Figure 9 Show Figure 7 The cross-sectional view along the BB direction of the planetary gear carrier assembly including the tapered boss shown. Figure 2 .

[0030] Figure label:

[0031] Planetary gear carrier 100;

[0032] Support shaft 110; boss 111; second chamfer 1111; mounting part 112; protrusion 1121; groove 1122; upper surface 1123; output part 113;

[0033] Planetary shaft 120; connecting part 121; groove 1211; transmission part 122; first chamfer 1221;

[0034] Non-metallic planetary carrier body 130; upper end face 131; lower end face 132; side wall 133; flange 134; top surface 1341; axial clearance 135;

[0035] Planetary gear carrier assembly 200;

[0036] Sun gear 210; lower surface 211; inner hole 212; planetary gear 220. Detailed Implementation

[0037] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Although the description of this utility model will be presented in conjunction with preferred embodiments, this does not mean that the features of this utility model are limited to this embodiment. On the contrary, the purpose of describing the utility model in conjunction with the embodiments is to cover other options or modifications that may be derived based on the claims of this utility model. To provide a deep understanding of this utility model, many specific details will be included in the following description. This utility model may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of this utility model, some specific details will be omitted in the description. It should be noted that, without conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0038] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0039] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use. They are only for the convenience of describing the utility model 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. Therefore, they should not be construed as limitations on the utility model.

[0040] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0041] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment based on the specific circumstances.

[0042] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0043] For ease of subsequent description, the X direction is first defined by way of example in this application embodiment. For example... Figure 1 As shown, the X direction is the axial direction of the support shaft 110.

[0044] refer to Figure 1 , Figure 2 This application provides a planetary gear carrier 100, including: a support shaft 110, the support shaft 110 being made of metal, and the support shaft 110 being positioned along its axial direction ( Figure 1 (In the X direction), the support shaft 110 includes a boss 111, a mounting part 112, and an output part 113; three planetary shafts 120, which are made of metal, are evenly spaced along the circumference of the support shaft 110, and each planetary shaft 120 includes a connecting part 121 and a transmission part 122; a non-metallic planetary carrier body 130 is formed by injection molding around the mounting part 112 and the connecting part 121; along the axial direction, the non-metallic planetary carrier body 130 has an upper end face 131 and a lower end face 132; wherein, the transmission part 122 protrudes from the upper end face 131; the output part 113 protrudes from the lower end face 132, and the boss 111 protrudes from the upper end face 131.

[0045] In this embodiment, the non-metallic planetary carrier body 130 is made of plastic. In some possible embodiments, the material of the non-metallic planetary carrier body 130 may include, but is not limited to, plastic, and may be other non-metallic materials, such as rubber, ceramics, novel composite materials, etc., which can be selected according to actual needs.

[0046] In some possible implementations, the number of planetary shafts 120 includes, but is not limited to, three, and needs to be determined according to the number of planetary gears 220 in the applicable scenario. It can be one, two, four, or more. In some possible implementations, the multiple planetary shafts 120 are spaced apart circumferentially along the support shaft 110, including but not limited to being uniformly spaced. This can be adaptively adjusted according to the application scenario of the planetary gears 220, resulting in a non-uniformly spaced arrangement of the multiple planetary shafts 120 circumferentially along the support shaft 110.

[0047] Specifically, the forming process of the planetary gear carrier 100 is as follows:

[0048] First, the support shaft 110 and planetary shaft 120, as metal inserts, are partially fixed in predetermined positions within the mold cavity. Then, molten injection molding material is injected into the mold, completely covering the mounting portion 112 of the support shaft 110 and the connecting portion 121 of the planetary shaft 120, forming a non-metallic planetary carrier body 130 according to the shape of the mold cavity. Through this injection molding process, the support shaft 110, planetary shaft 120, and non-metallic planetary carrier body 130 form a planetary gear carrier 100 made of dissimilar materials. By using the metal mounting portion 112 and the metal connecting portion 121 as inserts, and using injection molding to cover the inserts and mold them into a non-metallic planetary carrier body 130, specifically through insert molding, a planetary gear carrier 100 made of dissimilar materials is formed. Compared to metal planetary carriers, the manufacturing process of the planetary gear carrier 100 is simpler, requiring no additional processing steps, and is formed in a single injection molding process, achieving lightweight design. Furthermore, the injection molding process ensures seamless connection between components, eliminating assembly errors. The output section 113 is used to output rotational power.

[0049] In some possible embodiments, the support shaft 110 and the planetary shaft 120 are both made of metal, such as steel, aluminum alloy, copper, etc. In some possible embodiments, the material of the support shaft 110 includes, but is not limited to, metal, and the material of the planetary shaft 120 includes, but is not limited to, metal. As an insert, the non-metallic planetary carrier body 130 can be injection molded to cover part of the planetary shaft 120 and the support shaft 110 through insert molding. For example, it can be high-performance engineering plastic or composite material.

[0050] refer to Figure 1 , Figure 2 In this embodiment, the sidewall 133 of the non-metallic planetary carrier body 130 is provided with a continuous, annular flange 134 extending outward in the circumferential direction. The flange 134 is along the axial direction of the support shaft 110, and the top surface 1341 of the flange 134 is flush with the upper end surface 131. In some possible embodiments, the shape of the flange 134 includes, but is not limited to, a continuous ring shape. It can also be a discontinuous or non-continuous flange 134, which can still serve a positioning function while saving costs.

[0051] By providing a flange 134 circumferentially on the side wall 133 of the non-metallic planetary carrier body 130, and having the top surface 1341 of the flange 134 flush with the upper end surface 131, the upper end surface 131 of the non-metallic planetary carrier body 130 can be positioned by the position of the protruding flange 134. When the non-metallic planetary carrier body 130 is installed in other structures, such as gearboxes, the flange 134 can also stably engage with a preset shoulder or groove (not shown in the figure) to achieve limiting and fixing.

[0052] For ease of subsequent description, the Y direction is first defined by way of example in this application embodiment. For example... Figure 3 As shown, the Y direction is the radial direction of the mounting part 112.

[0053] refer to Figure 2 , Figure 3 , Figure 4 In this embodiment, the edge of the mounting portion 112 is provided with 15 arc-shaped protrusions 1121, and an arc-shaped groove 1122 is formed between adjacent arc-shaped protrusions 1121. In some possible implementations, the number of protrusions 1121 includes, but is not limited to, 15, and the specific number can be adjusted according to actual needs, and can be one or more. The shape of the protrusions 1121 includes, but is not limited to, arc shape, and can be rectangular, conical, triangular, etc. The shape of the groove 1122 includes, but is not limited to, arc shape, and can be rectangular, conical, serrated, etc.

[0054] By providing multiple protrusions 1121 along the edge of the mounting portion 112, and forming grooves 1122 between adjacent protrusions 1121, a non-metallic planetary carrier body 130 is formed after injection molding, interlocking with the mounting portion 112, thereby further achieving circumferential positioning of the mounting portion 112. Compared to a smooth edge connection method, relative rotation between the mounting portion 112 and the non-metallic planetary carrier body 130 can be suppressed. In addition, the structure of the protrusions 1121 and grooves 1122 increases the contact area, thereby enhancing the injection molding bonding force and making the two more firmly bonded.

[0055] refer to Figure 3 In this embodiment, each planetary shaft 120 is directly opposite a groove 1122, and along the radial direction of the mounting portion 112 ( Figure 3 In the Y direction, the planetary shaft 120 and the groove 1122 are spaced apart. By designing the planetary shaft 120 directly opposite the groove 1122, compared to the protrusion 1121 directly opposite the planetary shaft 120, the injection molding area between the mounting part 112 and the planetary shaft 120 is increased, thereby enhancing the local structural strength of the non-metallic planetary carrier body 130 formed by injection molding.

[0056] In some possible implementations, the planetary shaft 120 may not be directly opposite the groove 1122. By setting the distance between the planetary shaft 120 and the mounting part 112, the injection molding process of the non-metallic planetary carrier body 130 and the hardness requirements after molding can be ensured. The planetary shaft 120 can be positioned offset from the groove 1122 or directly opposite the protrusion 1121.

[0057] refer to Figure 4 In this embodiment, the boss 111 is a cylinder of uniform diameter. In some possible implementations, the shape of the boss 111 may include, but is not limited to, a cylinder, and may be a tapered shape with varying diameter, a stepped shape, a keyed shape, etc., as long as the sun gear 210 can be clearance-fitted with at least a portion of the boss 111.

[0058] For ease of subsequent description, the embodiments of this application first exemplarily define the C direction and the D direction. For example... Figure 5 As shown, direction C is the direction from the lower end face 132 to the upper end face 131, and direction D is the direction from the upper end face 131 to the lower end face 132.

[0059] refer to Figure 5 In this embodiment, the boss 111 is conical, and the diameter of the boss 111 extends from the lower end face 132 to the upper end face 131. Figure 5 The diameter gradually decreases in the C direction. Furthermore, the end of the boss 111 furthest from the mounting part 112 has a second chamfer 1111. By setting the second chamfer 1111, precise alignment and smooth insertion of the sun gear 210 and the boss 111 are achieved during the assembly process, effectively avoiding scratches, jamming, or damage to the mating surfaces caused by interference from sharp edges during assembly.

[0060] By designing the boss 111 as a cone, the diameter of the boss 111 gradually decreases from the lower end face 132 to the upper end face 131. When the sun gear 210 is fitted onto the boss 111, the natural guiding effect of the cone surface can guide the sun gear 210 to be centered and installed.

[0061] refer to Figure 6 In this embodiment, the end of the transmission part 122 away from the connecting part 121 is provided with a first chamfer 1221. The outer periphery of the connecting part 121 is provided with three grooves 1211, which extend circumferentially along the planetary shaft 120. In some possible implementations, the number of grooves 1211 includes, but is not limited to, three, and the specific number can be adjusted according to actual needs, and may be one or more.

[0062] By setting the first chamfer 1221, the planetary gear 220 and planetary shaft 120 are precisely aligned and smoothly introduced during the assembly process, effectively avoiding scratches, jamming or damage to mating surfaces caused by interference from sharp corners during assembly, thereby improving assembly efficiency and ensuring the service life of the planetary gear.

[0063] By providing a circumferentially extending groove 1211 on the outer periphery of the metal connecting portion 121, the connecting portion 121 acts as a metal insert. During injection molding, the injection molding material is embedded and solidified within the groove 1211, forming a mechanical interlock between the non-metallic planetary carrier body 130 and the planetary shaft 120. This prevents the planetary shaft 120 from undergoing axial displacement or loosening relative to the non-metallic planetary carrier body 130 under stress. Simultaneously, it increases the effective connection area, enhances the tightness of the non-metallic planetary carrier body 130's coverage of the planetary shaft 120 and the bonding force of the injection molding, resulting in a more robust bond between the two.

[0064] refer to Figure 8 In this embodiment, along the axial direction of the support shaft 110, the upper surface 1123 of the mounting part 112 is lower than the upper end surface 131.

[0065] The sun gear 210 is fitted onto the boss 111 and forms a clearance fit with the boss 111. By making the upper surface 1123 of the mounting part 112 axially lower than the upper end face 131 of the non-metallic planetary carrier body 130, an axial clearance 135 is formed between the sun gear 210 and the upper surface 1123 of the mounting part 112. In some possible embodiments, when the area of ​​the lower surface 211 of the sun gear 210 is less than or equal to the area of ​​the upper surface 1123 of the mounting part 112, when the sun gear 210 moves axially towards the lower end face 132 under vibration conditions, the axial clearance 135 provides a buffer space for the sun gear 210 to move axially towards the non-metallic planetary carrier body 130 under vibration conditions, avoiding contact between the lower surface 211 of the sun gear 210 and the non-metallic planetary carrier body 130 and the mounting part 112, thereby effectively preventing abnormal noise or jamming caused by contact.

[0066] When the area of ​​the lower surface 211 of the sun gear 210 is greater than the area of ​​the upper surface 1123 of the mounting part 112, when the sun gear 210 moves axially to the lower end face 132 under vibration conditions, even if part of the lower surface 211 of the sun gear 210 contacts the upper end face 131 of the non-metallic planetary carrier body 130, it will not contact the upper surface 1123 of the mounting part 112. The resulting axial clearance 135 reduces the actual contact area between the lower surface 211 of the sun gear 210 and the non-metallic planetary carrier body 130, effectively reducing frictional resistance and wear.

[0067] refer to Figure 7 , Figure 8 In this embodiment, this application provides a planetary gear carrier assembly 200, including: a planetary gear carrier 100 as described in any of the above embodiments; a sun gear 210, which is sleeved on a boss 111 in the planetary gear carrier 100 and has a clearance fit with the boss 111. In this embodiment, the boss 111 is as follows: Figure 4 The cylindrical boss 111 shown has a height lower than that of the sun gear 210. In some possible embodiments, the height of the boss 111 may be higher than or equal to the height of the sun gear 210, as long as the sun gear 210 can fit over the boss 111; the specific height is not limited. Multiple planetary gears 220 are mounted on the transmission part 122 in the corresponding planetary gear carrier 100, with a clearance fit between them. The planetary gears 220 mesh with the sun gear 210.

[0068] refer to Figure 9 In this embodiment, the boss 111 in the planetary gear carrier 100 is as follows: Figure 5 The conical boss 111 shown has a diameter extending from the lower end face 132 to the upper end face 131. Figure 5 The diameter gradually decreases in the C direction. The inner hole 212 of the sun gear 210 is clearance-fitted with a portion of the boss 111, while another portion of the boss 111 can contact the inner wall of the inner hole 212. Under vibration conditions, the tapered boss 111 can also act as a unidirectional limiting device, preventing the sun gear 210 from colliding with the non-metallic planetary carrier body 130. Specifically, by setting the maximum diameter b of the boss 111... Figure 9 (As shown in b) is larger than the diameter c of the inner hole 212 of the sun gear 210. Figure 9 As shown in Figure c), when the sun gear 210 vibrates from the upper end face 131 to the lower end face 132 (as shown in Figure c), Figure 5 When the sun gear 210 moves in the D direction, it will be stopped on the inclined surface of the conical boss 111, thereby preventing the sun gear 210 from continuing to move from the upper end face 131 to the lower end face 132, and avoiding collision between the sun gear 210 and the non-metallic planetary carrier body 130.

[0069] Although the present invention has been illustrated and described with reference to certain preferred embodiments, those skilled in the art should understand that the above description is a further detailed explanation of the present invention in conjunction with specific embodiments, and should not be construed as limiting the specific implementation of the present invention to these descriptions. Those skilled in the art can make various changes in form and detail, including some simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A planetary gear carrier, characterized in that, include: The support shaft is made of metal and includes a boss, a mounting part, and an output part along its axial direction. Multiple planetary shafts, made of metal, are arranged circumferentially along the support shaft, and each planetary shaft includes a connecting part and a transmission part; A non-metallic planetary carrier body is injection molded onto the outer periphery of the mounting portion and the connecting portion; along the axial direction, the non-metallic planetary carrier body has an upper end face and a lower end face; The transmission part protrudes from the upper end face; the output part protrudes from the lower end face; and the boss protrudes from the upper end face.

2. The planetary gear carrier as described in claim 1, characterized in that, The mounting portion has multiple protrusions on its edge, and grooves are formed between adjacent protrusions.

3. The planetary gear carrier as described in claim 2, characterized in that, The planetary shaft is directly opposite the groove and is spaced apart from the groove along the radial direction of the mounting portion.

4. The planetary gear carrier as described in claim 1, characterized in that, The outer periphery of the connecting part is provided with at least one groove, which extends circumferentially along the planetary axis.

5. The planetary gear carrier as described in claim 1, characterized in that, The boss is conical, and its diameter gradually decreases from the lower end face to the upper end face.

6. The planetary gear carrier as claimed in claim 1, characterized in that, Along the axial direction, the upper surface of the mounting portion is lower than the upper end face.

7. The planetary gear carrier as claimed in claim 1, characterized in that, The transmission part has a first chamfer at the end away from the connecting part; the boss has a second chamfer at the end away from the mounting part.

8. The planetary gear carrier as described in claim 6, characterized in that, The sidewall of the non-metallic planetary carrier body is provided with an outwardly extending flange along the circumferential direction, and the top surface of the flange is flush with the upper end surface along the axial direction.

9. A planetary gear carrier assembly, characterized in that, include: The planetary gear carrier as described in any one of claims 1 to 8; The sun gear is fitted onto a boss in the planetary gear carrier and is clearance-fitted with at least a portion of the boss. Multiple planetary gears, each planetary gear being fitted onto the transmission part in the corresponding planetary gear carrier, with a clearance fit to the transmission part, and the planetary gear meshing with the sun gear.

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