Sun gear and gearbox assembly

Abstract

The utility model provides a sun gear and gear box assembly, which relates to the field of gears and comprises a shaft body, an assembly tooth part and an oil guide part. An assembling inner hole is formed in the shaft body, and an annular groove is formed in the peripheral surface of the shaft body; the assembling tooth parts are arranged on the outer circumferential face of the shaft body and distributed around the axis of the shaft body, and the assembling tooth parts are used for being meshed with a planet wheel. The oil guide part is arranged on the peripheral surface of the shaft body, and a distance is formed between the oil guide part and the assembly tooth part in the axial direction of the shaft body, so that an oil storage area is formed between the oil guide part and the assembly tooth part; an oil guide through groove extending in the axial direction of the shaft body is formed in the oil guide part, and the oil guide through groove communicates with the oil storage area; a positioning face used for abutting against the bearing inner ring is arranged on the side, away from the assembling tooth part, of the oil guiding part. The annular groove is located in the side, away from the assembling tooth part, of the positioning face, and a distance is formed between the positioning face and the annular groove in the axial direction of the shaft body. The sun gear not only can position the bearing, but also can guide lubricating oil to the bearing, so that the lubricating effect of the bearing is improved, and the service life of the bearing is prolonged.

Description

Technical Field

[0001] The utility model relates to the field of gears, and in particular to a sun gear and a gear box assembly. Background Art

[0002] In the prior art, both ends of the sun gear of the electric drive planetary reduction box are mounted on the housing through bearings. The sun gear is roughly located in the middle of the gearbox, which is much higher than the oil filling level, making it difficult to lubricate the supporting bearings for mounting the sun gear. Especially under high-speed conditions, the centrifugal effect causes the lubricating oil to be quickly separated and thrown out from the sun gear and its supporting bearings, making it difficult to lubricate the bearings at both ends of the sun gear. In addition, both ends of the sun gear are supported by bearings, that is, the sun gear is supported by two bearings. To a certain extent, the axial size and number of parts of the planetary transmission mechanism are increased, which is not conducive to reducing product size and cost. In addition, the bearings for mounting the sun gear are generally supported on the housing, and the speed of the bearings is basically equal to the input speed, resulting in large vibrations and a short service life of the bearings. Utility Model Content

[0003] The purpose of the utility model is to provide a sun gear and gear box assembly, which can improve the lubrication effect of the bearing supporting the sun gear and improve the operating reliability; it can also reduce the axial size, which is conducive to miniaturization design and reduces costs; it can also reduce bearing vibration and extend the service life of the bearing.

[0004] The embodiment of the utility model is achieved as follows:

[0005] In a first aspect, the utility model provides a sun gear, comprising:

[0006] A shaft body, an assembly tooth portion and an oil guide portion, the shaft body being provided with an assembly inner hole for passing the motor output shaft, and an annular groove for mounting a clamping ring being provided on the outer circumferential surface of the shaft body; the assembly tooth portion being provided on the outer circumferential surface of the shaft body and being arranged around the axis of the shaft body, the assembly tooth portion being used to mesh with a planetary gear; the oil guide portion being provided on the outer circumferential surface of the shaft body and being spaced apart from the assembly tooth portion in the axial direction of the shaft body, so that an oil storage area is formed between the oil guide portion and the assembly tooth portion; the oil guide portion being provided with an oil guide through groove extending in the axial direction of the shaft body, the oil guide through groove being connected to the oil storage area; a positioning surface for abutting against an inner ring of a bearing is provided on a side of the oil guide portion away from the assembly tooth portion; the annular groove is located on a side of the positioning surface away from the assembly tooth portion, and the positioning surface and the annular groove are spaced apart in the axial direction of the shaft body.

[0007] In an optional embodiment, an internal spline for cooperating with an output shaft of a motor is provided on the hole wall of the assembly inner hole.

[0008] Based on the above scheme, the motor output shaft is inserted into the assembly inner hole and positioned through the assembly inner hole, and the external splines on the motor output shaft can engage with the internal splines in the assembly inner hole. The assembly is convenient and the combination is firm, which can realize stable and reliable transmission of torque.

[0009] In an optional embodiment, the internal spline is located on a side of the positioning surface away from the annular groove, and a distance is provided between the internal spline and the positioning surface in the axial direction of the shaft body.

[0010] Based on the above scheme, the motor output shaft is passed through the assembly inner hole and can pass over the installation bearing position of the sun gear, so that the motor output shaft can support and position the sun gear while transmitting torque, ensuring that the force point of the sun gear is close to the center line position of the sun gear, and the sun gear is not easy to shake during rotation, and the rotation is more stable.

[0011] In an optional embodiment, the assembly inner hole includes a first hole segment, a second hole segment and a third hole segment which are connected in sequence, the hole diameters of the first hole segment, the second hole segment and the third hole segment gradually decrease, and the internal spline is arranged on the hole wall of the third hole segment; the assembly tooth portion is located on the outer peripheral surface of the shaft body corresponding to the third hole segment.

[0012] Based on the above scheme, the motor output shaft passes through the first hole section, passes through the second hole section and enters the third hole section, and meshes with the internal spline in the third hole section. Since the aperture of the first hole section is relatively large, the motor output shaft encounters less obstruction when inserted into the assembly inner hole, and is not easy to interfere with the end face of the sun gear, so the insertion is more convenient and quick. And because the internal spline is set in the third hole section, and the aperture of the third hole section is small, the wall thickness of the sun gear at the third hole section is large, the location where the internal spline is set has high structural strength, is not easy to be damaged when transmitting torque, and has a long service life.

[0013] In an optional embodiment, the assembly tooth portion has a plurality of assembly tooth grooves arranged at intervals in the circumferential direction of the shaft body, the number of the oil guiding grooves is multiple, the number of the plurality of assembly tooth grooves is equal to and corresponds one to one to the plurality of oil guiding grooves, and the corresponding assembly tooth grooves extend in the same direction as the oil guiding grooves.

[0014] Based on the above scheme, multiple oil guide grooves are arranged at intervals in the circumferential direction of the shaft body, and the lubricating oil can reach the assembly bearing from the surroundings of the sun gear, so that the surroundings of the assembly bearing can be effectively lubricated, the lubrication effect is improved, and the service life of the bearing is long. In addition, the number of oil guide grooves and assembly tooth grooves is equal and one-to-one. The oil guide grooves can be directly formed while processing the assembly tooth grooves, which reduces the processing difficulty and improves the processing efficiency.

[0015] In an optional embodiment, the oil guiding portion includes a plurality of oil deflector strips arranged at intervals in the circumferential direction of the shaft body, and the oil guiding groove is defined between adjacent oil deflector strips; the side surface of the oil deflector strip close to the assembly tooth portion is configured as an arc-shaped oil guiding surface, and the distance between the oil guiding surface and the assembly tooth portion gradually increases in the radial outward direction from the shaft body.

[0016] Based on the above scheme, during the rotation of the sun gear, the lubricating oil can move from the assembly tooth portion to the oil guide portion along the axis of the sun gear. When the lubricating oil moves to the oil storage area, it can be retained in the oil storage area, extending the time the lubricating oil stays on the sun gear, so that more lubricating oil can enter the position of the assembly bearing through the oil guide surface and the oil guide groove, effectively lubricating the assembly bearing. At the same time, under the action of the oil guide surface, the height of part of the lubricating oil increases and when leaving the edge of the oil guide surface, it can contact the radially outward area of ​​the assembly bearing, that is, the lubricating oil moves outward a greater distance, which can increase the lubrication area and improve the lubrication effect.

[0017] In an optional embodiment, an extension direction of the oil guiding groove forms an angle with the axis of the shaft body.

[0018] Based on the above scheme, within a space of a set length in the axial direction of the shaft body, the oil guide groove and the axis of the shaft body have an angle, which extends the length of the oil guide groove and the distance that the lubricating oil moves in the oil guide groove. The lubricating oil leaves the oil guide groove at a greater speed under the guidance of the oil guide groove, which is conducive to impacting the assembled bearing and is in oblique contact with the assembled bearing, thereby increasing the contact area and improving the lubrication effect.

[0019] In a second aspect, the utility model provides a gearbox assembly, the gearbox assembly comprising:

[0020] A housing, a ring gear, a planet carrier, a planetary gear, an assembled bearing and a sun gear according to any one of the aforementioned embodiments, wherein the ring gear is fixed in the housing, the planet carrier is rotatably mounted in the housing, the planetary gear is rotatably mounted on the planetary carrier, and the planetary gear is meshed with the assembled tooth portion and the ring gear at the same time; the sun gear is rotatably matched with the planet carrier through the assembled bearing; and the inner ring of the assembled bearing abuts against the positioning surface.

[0021] In an optional embodiment, the gearbox assembly further includes an oil seal installed between the sun gear and the planet carrier.

[0022] Based on the above solution, the oil seal can improve the sealing between the sun gear and the planet carrier.

[0023] In an optional embodiment, the gearbox assembly further comprises a clamping ring, the clamping ring is clamped with the annular groove, and the clamping ring abuts against a side of the inner ring of the assembled bearing away from the oil guide portion.

[0024] Based on the above solution, the inner ring of the assembled bearing is positioned by the cooperation between the positioning surface of the oil guide portion and the clamping ring. The assembled bearing has a good limiting effect in the axial direction of the shaft body and runs stably and reliably.

[0025] The beneficial effects of the embodiments of the utility model are:

[0026] In summary, the sun gear provided in this embodiment includes a shaft body and an assembly tooth portion and an oil guide portion provided on the outer peripheral surface of the shaft body. The assembly tooth portion can mesh with the planetary gear, and the assembly inner hole on the shaft body can cooperate with the motor output shaft. The motor output shaft transmits the torque to the shaft body through the assembly inner hole, and then transmits it to the assembly tooth portion through the shaft body, and finally transmits it to the planetary gear. The design of the oil guide portion forms an oil guide structure on the outer peripheral surface of the shaft body. During the rotation of the sun gear, the lubricating oil reaches the assembly tooth portion, and after passing over the assembly tooth portion, it enters the oil storage area formed between the assembly tooth portion and the oil guide portion. The lubricating oil can enter the oil guide groove on the oil guide portion from the oil storage area, and enter the assembly bearing installed on the oil guide portion away from the assembly tooth portion along the oil guide groove, thereby effectively lubricating the assembly bearing supporting the sun gear. Since the oil storage area can increase the oil storage amount of the lubricating oil liquid involved in lubricating the assembly bearing, the lubrication effect can be improved. At the same time, an assembly bearing is installed on the shaft body, and the sun gear is positioned through an assembly bearing, which not only reduces the number of parts, but also shortens the size of the sun gear in its axial direction, which is conducive to miniaturization and lightweight design and reduces manufacturing costs. The sun gear is directly matched with the planet carrier through the assembly bearing. Since the planet carrier rotates relative to the sun gear, the rotation speed of the assembly bearing can be reduced, thereby reducing the vibration of the assembly bearing during operation and extending the life of the assembly bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 A schematic diagram of a sun gear according to an embodiment of the present utility model;

[0029] Figure 2 It is a cross-sectional schematic diagram of the sun gear of an embodiment of the utility model;

[0030] Figure 3A schematic diagram of a gearbox assembly according to an embodiment of the present utility model;

[0031] Figure 4 for Figure 3 A local enlarged schematic diagram of the .

[0032] icon:

[0033] 001-sun gear; 011-oil storage area; 100-shaft body; 101-assembly inner hole; 102-annular groove; 103-first hole section; 104-second hole section; 105-third hole section; 110-first shaft section; 120-second shaft section; 130-internal spline; 200-assembly tooth section; 201-assembly tooth groove; 300-oil guide section; 301-oil guide groove; 310-positioning surface; 320-oil retaining strip; 321-oil guide surface; 002-housing; 003-gear ring; 004-planet carrier; 005-planetary gear; 006-assembly bearing; 007-oil seal; 008-retaining ring. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0037] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0038] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0039] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] Please refer to Figure 1 and Figure 2 , this embodiment provides a sun gear 001, which includes a shaft body 100, an assembly tooth portion 200 and an oil guide portion 300. The shaft body 100 is provided with an assembly inner hole 101 for passing the motor output shaft, and the outer peripheral surface of the shaft body 100 is provided with an annular groove 102 for assembling the clamping ring 008; the assembly tooth portion 200 is provided on the outer peripheral surface of the shaft body 100 and arranged around the axis of the shaft body 100, and the assembly tooth portion 200 is used to mesh with the planetary gear 005; the oil guide portion 300 is provided on the outer peripheral surface of the shaft body 100 and has a spacing with the assembly tooth portion 200 in the axial direction of the shaft body 100, so that the oil guide portion 300 and the assembly tooth portion 200 are spaced apart from each other in the axial direction of the shaft body 100, so that the oil guide portion 300 and the assembly tooth portion 200 are spaced apart from each other in the axial direction of the shaft body 100. An oil storage area 011 is formed between the teeth 200; an oil guiding groove 301 extending in the axial direction of the shaft body 100 is provided on the oil guiding portion 300, and the oil guiding groove 301 is connected to the oil storage area 011; a positioning surface 310 for abutting against the inner ring of the bearing is provided on the side of the oil guiding portion 300 away from the assembly tooth portion 200; the annular groove 102 is located on the side of the positioning surface 310 away from the assembly tooth portion 200, and the positioning surface 310 and the annular groove 102 are spaced apart in the axial direction of the shaft body 100.

[0041] Based on the above solution, the working mode of the sun gear 001 provided in this embodiment is as follows:

[0042] Please combine Figure 3 and Figure 4 , the sun gear 001 is used in conjunction with the planetary gear 005, the planetary carrier 004 and the motor output shaft, the motor output shaft is inserted into the assembly inner hole 101 of the sun gear 001, the assembly tooth portion 200 on the sun gear 001 meshes with the planetary gear 005, the planetary gear 005 is rotatably mounted on the planetary carrier 004, and the sun gear 001 is rotatably mounted in the middle of the planetary carrier 004 through the assembly bearing 006. After starting, the motor output shaft rotates to transmit the torque to the sun gear 001, and the sun gear 001 transmits the torque to the planetary gear 005. After the planetary gear 005 cooperates with the ring gear 003, it can revolve around the axis of the planetary carrier 004 while rotating, thereby driving the planetary carrier 004 to rotate, and the torque output is realized through the planetary carrier 004.

[0043] Since the shaft body 100 of the sun gear 001 is provided with an oil guide portion 300, an oil guide structure is formed on the outer peripheral surface of the shaft body 100. During the rotation of the sun gear 001, the lubricating oil reaches the assembly tooth portion 200, and after passing over the assembly tooth portion 200, enters the oil storage area 011 formed between the assembly tooth portion 200 and the oil guide portion 300. The lubricating oil can enter the oil guide groove 301 on the oil guide portion 300 from the oil storage area 011, and enter the assembly bearing 006 installed on the oil guide portion 300 away from the assembly tooth portion 200 along the oil guide groove 301, thereby effectively lubricating the assembly bearing 006 supporting the sun gear 001. Since the oil storage area 011 can increase the oil storage amount of the lubricating oil involved in lubricating the assembly bearing 006, the lubrication effect can be improved. At the same time, an assembly bearing 006 is installed on the shaft body 100, and the sun gear 001 is positioned by an assembly bearing 006, which not only reduces the number of parts, but also shortens the size of the sun gear 001 in its axial direction, which is conducive to miniaturization and lightweight design, and reduces manufacturing costs. The sun gear 001 is directly matched with the planet carrier 004 through the assembly bearing 006. Since the planet carrier 004 rotates relative to the sun gear 001, the rotation speed of the assembly bearing 006 can be reduced, thereby reducing the vibration of the assembly bearing 006 during operation and extending the life of the assembly bearing 006.

[0044] The following embodiments illustrate the details of the sun gear 001 provided in the present application by way of examples.

[0045] Please combine Figure 1 and Figure 2In this embodiment, optionally, the shaft body 100 is set as a cylinder, and a stepped assembly inner hole 101 is set in the middle of the shaft body 100. The cross-sectional profile of the assembly inner hole 101 is circular, and the cross section is a plane perpendicular to the axis of the shaft body 100. Specifically, the assembly inner hole 101 is provided with a first hole section 103, a second hole section 104 and a third hole section 105 that are connected in sequence. The apertures of the first hole section 103, the second hole section 104 and the third hole section 105 gradually decrease, and the port of the first hole section 103 is set as a tapered port, which is convenient for the motor output shaft to be inserted from the first hole section 103. At the same time, an internal spline 130 is provided on the hole wall of the third hole section 105, and the internal spline 130 is located on the side of the oil guide portion 300 away from the annular groove 102. In other words, the position of the internal spline 130 corresponds to the position of the assembly tooth portion 200 in the axial direction of the shaft body 100, that is, the internal spline 130 is provided on the hole wall of the third hole section 105, and the assembly tooth portion 200 is located on the outer peripheral surface of the shaft body 100 corresponding to the third hole section 105. The motor output shaft cooperates with the internal spline 130 to drive the sun gear 001 to rotate, and the torque of the sun gear 001 is transmitted to the planetary gear 005 through the assembly tooth portion 200. The distance between the position where the internal spline 130 transmits torque and the position where the assembly tooth portion 200 transmits torque in the axial direction of the shaft body 100 is substantially zero, and it is not easy to shake in the axial direction, and the torque transmission is more stable. Since the third hole section 105 has a small diameter and a large distance from the shaft body 100 , that is, the wall thickness of the shaft body 100 corresponding to the third hole section 105 is large and the structural strength is high, torque is transmitted here and is not easily damaged.

[0046] Optionally, the shaft body 100 includes an integrated first shaft segment 110 and a second shaft segment 120, the first shaft segment 110 and the second shaft segment 120 are coaxially arranged, the assembly inner hole 101 penetrates the first shaft segment 110 and the second shaft segment 120 at the same time, the first hole segment 103 penetrates the first shaft segment 110 and partially extends into the second shaft segment 120, and the second hole segment 104 and the third hole segment 105 both penetrate the second shaft segment 120. The outer diameter of the first shaft segment 110 is smaller than the outer diameter of the second shaft segment 120. The assembly tooth portion 200 and the oil guide portion 300 are both arranged on the outer peripheral surface of the second shaft segment 120, and the assembly tooth portion 200 is close to the end of the second shaft segment 120 away from the first shaft segment 110. The annular groove 102 is arranged on the outer peripheral surface of the second shaft segment 120.

[0047] Since the outer diameter of the second shaft segment 120 is small, when the oil seal 007 is installed on the first shaft segment 110 , the radial dimension of the oil seal 007 in the shaft body 100 can be reduced.

[0048] Please combine Figure 1 and Figure 2In this embodiment, optionally, the assembly tooth portion 200 has a plurality of assembly tooth grooves 201 arranged at intervals in the circumferential direction of the shaft body 100, and correspondingly, the number of the oil guide grooves 301 is multiple, and the number of the plurality of assembly tooth grooves 201 is equal to and one-to-one corresponds to the plurality of oil guide grooves 301, and the corresponding assembly tooth grooves 201 extend in the same direction as the oil guide grooves 301. In this way, the oil guide grooves 301 can be formed while machining the assembly tooth grooves 201 of the assembly tooth portion 200, thereby reducing machining difficulty and improving machining efficiency.

[0049] Optionally, the oil guide portion 300 includes a plurality of oil retaining strips 320 arranged at intervals in the circumferential direction of the shaft body 100, and an oil guide groove 301 is defined between adjacent oil retaining strips. The side of the oil retaining strip 320 close to the assembly tooth portion 200 is set as an arc-shaped oil guide surface 321, and the distance between the oil guide surface 321 and the assembly tooth portion 200 gradually increases in the radial outward direction from the shaft body 100. Due to the design of the oil guide surface 321, part of the lubricating oil is highly increased under the guidance of the oil guide surface 321, and when leaving the edge of the oil guide surface 321, it can contact the radial outward area of ​​the assembly bearing 006, thereby increasing the lubrication area and improving the lubrication effect. Furthermore, the oil retaining strip 320 has an angle with the axis of the shaft body 100, so that the extension direction of the oil guide groove 301 formed by two adjacent oil retaining strips 320 has an angle with the extension direction of the axis of the shaft body 100, that is, the oil guide groove 301 is inclined relative to the axis of the shaft body 100. When the lubricating oil enters the oil guiding groove 301 from the oil storage area 011, the distance moved in the oil guiding groove 301 is long, and the speed of the lubricating oil when leaving the oil guiding groove under the guidance of the oil guiding groove 301 is greater, which is conducive to impacting the assembled bearing 006, and is in oblique contact with the assembled bearing 006, thereby increasing the contact area and improving the lubrication effect.

[0050] It should be noted that the shaft body 100, the assembly tooth portion 200 and the oil guide portion 300 can be provided as an integrated structure, which has high structural strength, is easy to process and manufacture, and is suitable for mass production.

[0051] The sun gear 001 provided in this embodiment can guide more lubricating oil to the assembly bearing 006 by providing the oil guide portion 300, thereby effectively lubricating the assembly bearing 006 and extending the service life of the assembly bearing 006. The sun gear 001 is positioned and installed by an assembly bearing 006, which is beneficial to the miniaturization and lightweight design of the gearbox while reducing the number of parts. In addition, the assembly bearing 006 for positioning the sun gear 001 is matched with the planet carrier 004, and the relative rotation of the planet carrier 004 relative to the sun gear 001 is cleverly utilized to reduce the rotation speed of the assembly bearing 006, reduce vibration, and extend the service life of the assembly bearing 006.

[0052] Please combine Figure 3 and Figure 4The present embodiment further provides a gearbox assembly, comprising a housing 002, a gear ring 003, a planet carrier 004, a planetary gear 005, an assembled bearing 006, an oil seal 007, a retaining ring 008, and the sun gear 001 mentioned in the above embodiment. The gear ring 003 is fixed in the housing 002, the planet carrier 004 is rotatably mounted in the housing 002, the planetary gear 005 is rotatably mounted on the planet carrier 004, and the planetary gear 005 is meshed with the assembled toothed portion 200 and the gear ring 003 at the same time. The sun gear 001 is rotatably matched with the planet carrier 004 through the assembled bearing 006. One side surface of the inner ring of the assembled bearing 006 abuts against the positioning surface 310. The retaining ring 008 is clamped with the annular groove 102, and the retaining ring 008 abuts against the other side surface of the inner ring of the assembled bearing 006 away from the oil guide portion 300. The retaining ring 008 and the positioning surface 310 cooperate to limit the position of the assembled bearing 006 in the axial direction of the shaft body 100. The oil seal 007 is installed between the sun gear 001 and the planet carrier 004 to play a sealing role.

[0053] In the gearbox assembly provided in this embodiment, the lubricating oil can reach the assembly bearing 006 through the oil guide part 300, and can effectively lubricate the assembly bearing 006. The assembly bearing 006 cooperates with the planet carrier 004, with low speed, small vibration and long service life. In addition, the sun gear 001 relies on a single assembly bearing 006 to cooperate with the planet carrier 004, which reduces the number of parts, reduces costs, reduces the axial size of the gearbox, and is conducive to miniaturization and lightweight design.

[0054] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A sun gear, characterized in that: include: A shaft body (100), an assembly tooth portion (200) and an oil guide portion (300), wherein the shaft body (100) is provided with an assembly inner hole (101) for passing a motor output shaft, and an annular groove (102) for assembling a clamping ring (008) is provided on the outer circumferential surface of the shaft body (100); the assembly tooth portion (200) is provided on the outer circumferential surface of the shaft body (100) and is arranged around the axis of the shaft body (100), and the assembly tooth portion (200) is used to mesh with a planetary gear (005); the oil guide portion (300) is provided on the outer circumferential surface of the shaft body (100) and has a spacing with the assembly tooth portion (200) in the axial direction of the shaft body (100), so that the assembly tooth portion (200) is arranged ... on the outer circumferential surface of the shaft body (100) and is arranged with the assembly tooth portion (200) in the axial direction of the shaft body (100), so that the assembly tooth portion (200) is arranged on the outer circumferential surface of the shaft body (100) and is arranged on the outer circumferential surface of the shaft body (100) and is arranged with the assembly tooth portion (200) in the axial direction of the shaft body (100), so An oil storage area (011) is formed between the oil guide portion (300) and the assembly tooth portion (200); an oil guide groove (301) extending in the axial direction of the shaft body (100) is provided on the oil guide portion (300), and the oil guide groove (301) is connected to the oil storage area (011); a positioning surface (310) for abutting against the inner ring of the bearing is provided on the side of the oil guide portion (300) away from the assembly tooth portion (200); the annular groove (102) is located on the side of the positioning surface (310) away from the assembly tooth portion (200), and a spacing is provided between the positioning surface (310) and the annular groove (102) in the axial direction of the shaft body (100).

2. The sun gear according to claim 1, characterized in that: An internal spline (130) for matching with the output shaft of the motor is arranged on the hole wall of the assembly inner hole (101).

3. The sun gear according to claim 2, characterized in that: The internal spline (130) is located on a side of the positioning surface (310) away from the annular groove (102), and a distance is provided between the internal spline (130) and the positioning surface (310) in the axial direction of the shaft body (100).

4. The sun gear according to claim 2, characterized in that: The assembly inner hole (101) comprises a first hole section (103), a second hole section (104) and a third hole section (105) which are connected in sequence, the hole diameters of the first hole section (103), the second hole section (104) and the third hole section (105) gradually decrease, and the internal spline (130) is arranged on the hole wall of the third hole section (105); the assembly tooth portion (200) is located on the outer peripheral surface of the shaft body (100) corresponding to the third hole section (105).

5. The sun gear according to claim 1, characterized in that: The assembly tooth portion (200) comprises a plurality of assembly tooth grooves (201) arranged at intervals in the circumferential direction of the shaft body (100); the number of the oil guide grooves (301) is multiple, the number of the plurality of assembly tooth grooves (201) and the number of the plurality of oil guide grooves (301) are equal and correspond one to one, and the corresponding assembly tooth grooves (201) and the oil guide grooves (301) extend in the same direction.

6. The sun gear according to claim 5, characterized in that: The oil guide portion (300) comprises a plurality of oil deflector strips (320) arranged at intervals in the circumferential direction of the shaft body (100), and the oil guide groove (301) is defined between adjacent oil deflector strips (320); the side surface of the oil deflector strip (320) close to the assembly tooth portion (200) is arranged as an arc-shaped oil guide surface (321), and the distance between the oil guide surface (321) and the assembly tooth portion (200) gradually increases in the radial outward direction from the shaft body (100).

7. The sun gear according to claim 1, characterized in that: The extension direction of the oil guiding groove (301) forms an angle with the axis of the shaft body (100).

8. A gearbox assembly, characterized in that: The gearbox assembly comprises: A housing (002), a ring gear (003), a planet carrier (004), a planet wheel (005), an assembled bearing (006), and a sun wheel (001) according to any one of claims 1 to 7, wherein the ring gear (003) is fixed in the housing (002), the planet carrier (004) is rotatably mounted in the housing (002), the planet wheel (005) is rotatably mounted on the planet carrier (004), and the planet wheel (005) is meshed with the assembled tooth portion (200) and the ring gear (003) at the same time; the sun wheel (001) is rotatably matched with the planet carrier (004) through the assembled bearing (006); and the inner ring of the assembled bearing (006) is in contact with the positioning surface (310).

9. The gearbox assembly according to claim 8, characterized in that: The gearbox assembly further comprises an oil seal (007), wherein the oil seal (007) is installed between the sun gear (001) and the planet carrier (004).

10. The gearbox assembly according to claim 8, characterized in that: The gearbox assembly further comprises a clamping ring (008), wherein the clamping ring (008) is clamped with the annular groove (102), and the clamping ring (008) abuts against a side of the inner ring of the assembled bearing (006) away from the oil guide portion (300).

Images