Inner tooth ring structure and gear box

Abstract

The application discloses an inner gear ring structure and a gear box, and relates to the field of mechanical transmission structures. The inner gear ring structure comprises an integrated gear body and an outer spline. The outer spline comprises a plurality of spline teeth, the plurality of spline teeth are distributed on the outer circumferential surface of the gear body, and the plurality of spline teeth are arranged at intervals in the circumferential direction of the gear body. Each spline tooth is drum-shaped, and the thickness of each spline tooth gradually decreases in the direction from the middle part to the two ends. The thickness direction of the spline tooth is consistent with the circumferential direction of the gear body. The application can reduce floating impact and vibration noise, and improve the spline matching eccentric load and eccentricity during the floating process of the gear ring.

Description

Technical Field

[0001] This utility model relates to the field of mechanical transmission structures, and more specifically, to an internal gear ring structure and a gearbox. Background Technology

[0002] Gearboxes, especially planetary gearboxes, transmit torque through the meshing of an internal gear ring and planetary gears. The internal gear ring is typically fixed to the gearbox housing via a spline structure.

[0003] The inventors discovered during their research that the internal gear ring of the planetary gearbox in the prior art has at least the following drawbacks:

[0004] 1. Load sharing is achieved by floating the internal gear ring with a clearance fit between the outer rectangular spline and the inner rectangular spline of the housing. Within the aforementioned spline fit clearance range, the gear ring floats by adjusting its axial angle to compensate for the gear meshing misalignment of several planetary gears, but this causes uneven load distribution in the spline fit. Similarly, it floats by radial offset to compensate for gear meshing misalignment of several planetary gears, but this causes eccentricity in the spline fit. Therefore, this floating load sharing process exacerbates wear and vibration noise in the spline fit, especially under high-speed operating conditions.

[0005] 2. The end face of the internal gear ring mates with the end face of the housing to achieve axial positioning. During the floating process of the gear ring, sliding friction and clearance impact occur at these mating surfaces. Conventional structures are simple and lack corresponding optimized designs. Excessive sliding friction and clearance impact significantly reduce the floating load-sharing performance of the gear ring, while also exacerbating wear and vibration noise at the end face mating surfaces, increasing heat loss, and reducing transmission efficiency and performance, especially noticeable at high speeds. Utility Model Content

[0006] The purpose of this invention includes, for example, providing an internal gear ring structure and gearbox that can reduce floating impact and vibration noise, and improve spline fit off-center loading and eccentricity during gear ring floating.

[0007] The embodiments of this utility model can be implemented as follows:

[0008] In a first aspect, this utility model provides an internal gear ring structure, comprising:

[0009] An integral gear body and an external spline, wherein the external spline includes multiple spline teeth, all of which are distributed on the outer circumferential surface of the gear body and are spaced apart in the circumferential direction of the gear body;

[0010] Each spline tooth is drum-shaped, and the thickness of each spline tooth gradually decreases from its center to both ends; the thickness direction of the spline tooth is consistent with the circumferential direction of the gear body.

[0011] In an optional embodiment, a spline groove is formed between any two adjacent spline teeth in the circumferential direction of the gear body. The bottom wall of the spline groove is configured as an outwardly convex arc surface, and the distance between the bottom wall of the groove and the axis of the gear body gradually decreases from the middle of the bottom wall of the groove to both sides.

[0012] Based on the above scheme, the bottom wall of the spline groove is arc-shaped along the tooth direction, that is, the tooth root of the spline tooth is arc-shaped along the tooth direction, forming the characteristics of the gear rim of the internal gear ring being thin at both ends and thick in the middle, and the spline teeth being high at both ends and low in the middle. This feature is conducive to the flexible deformation of the thin rim at both ends of the internal gear ring, so that the contact patch of the gear and spline tooth surface tends to be in the middle; it is also conducive to the elastic deformation of the spline teeth and the rim of the internal gear, improving the elastic load-sharing effect.

[0013] In an optional embodiment, the external spline has a first end face and a second end face disposed opposite to each other in the extension direction of the axis of the gear body, and a first lubrication groove communicating with the spline groove is provided on the first end face and / or the second end face.

[0014] Based on the above scheme, by setting the first lubrication groove and combining it with the arc-shaped structure of the tooth root of the external spline, a large amount of splashed oil can be guided into the side clearance of the spline mating tooth surface. At the same time, the drum-shaped tooth feature enhances the oil storage capacity of the side clearance, forming a stable lubricating oil film and reducing spline tooth surface wear and impact.

[0015] In an optional embodiment, the first lubrication groove is configured as an arc-shaped groove.

[0016] Based on the above scheme, the first lubrication groove has a simple structure, is easy to manufacture, and can better disperse the force applied to it, thereby reducing stress concentration points, making it less prone to material fatigue or crack propagation, and extending its service life. At the same time, the arc-shaped groove can provide a smoother flow path, reducing turbulence and energy loss.

[0017] In an optional embodiment, the external spline has a first end face and a second end face opposite each other in the extension direction of the axis of the gear body, the first end face and / or the second end face protruding from the gear body in the extension direction of the axis of the gear body.

[0018] Based on the above scheme, the end face of the external spline contacts the end face of the gearbox to achieve the limiting, which reduces the wear on the end face of the gear body and also facilitates the lubricating oil to enter the first lubrication groove radially from the gear body.

[0019] In an optional embodiment, a plurality of guide slopes are provided on the first end face and / or the second end face, and the plurality of guide slopes are respectively connected to the outer peripheral surfaces of the plurality of spline teeth.

[0020] Based on the above scheme, by setting a guide slope, it is beneficial to connect the external spline of the internal gear ring structure with the internal spline of the housing, and also to guide the lubricating oil through the guide slope.

[0021] In an optional embodiment, a second lubrication groove is provided on the first end face and / or the second end face, one end of the second lubrication groove extending to the corresponding guide slope.

[0022] Based on the above scheme, lubrication grooves are provided on both sides of the external spline at the positions corresponding to the spline teeth and spline slots. This guides the oil that is radially thrown out by the gear body to fill the second lubrication groove, forming a stable lubricating oil film and reducing end face sliding friction and gap impact.

[0023] In an optional embodiment, the second lubrication groove is configured as an arc-shaped groove.

[0024] Based on the above scheme, the second lubrication groove has a simple structure, is easy to manufacture, and can better disperse the force applied to it, thereby reducing stress concentration points, making it less prone to material fatigue or crack propagation, and extending its service life. At the same time, the arc-shaped groove can provide a smoother flow path, reducing turbulence and energy loss.

[0025] Secondly, this utility model provides a gearbox, the gearbox comprising:

[0026] The housing and the internal gear ring structure described in any of the foregoing embodiments, wherein the external spline is inserted into the housing and is interference-fitted with the housing.

[0027] In an optional embodiment, the housing is provided with an internal spline, and the external spline engages with the internal spline.

[0028] Based on the above scheme, the internal gear ring structure and the housing fit together in a simple way, making assembly easy.

[0029] The beneficial effects of this utility model embodiment include, for example:

[0030] In summary, the internal gear ring structure provided in this embodiment includes an integral gear body and an external spline. The external spline includes multiple spline teeth distributed on the outer circumferential surface of the gear body, and each spline tooth is configured as a drum shape. That is, the thickness of each spline tooth gradually decreases from the middle to both ends, and the thickness direction of the spline tooth is consistent with the circumferential direction of the gear body. By configuring the spline teeth as drum shapes, each spline tooth has two drum-shaped tooth surfaces opposite each other in the circumferential direction of the gear body. The drum-shaped tooth surfaces can improve the floating ability of the internal gear ring structure, allowing it to float along a drum-shaped trajectory, reducing floating impact and vibration noise. This improves the spline fit off-center loading and eccentricity during gear ring floating, reduces wear rate, reduces vibration noise generated during operation, extends the service life of the internal gear ring structure, and reduces maintenance costs. Attached Figure Description

[0031] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the internal gear ring structure from a first-view perspective in this embodiment;

[0033] Figure 2 for Figure 1 A magnified view of a portion of the image;

[0034] Figure 3 This is a schematic diagram of the internal gear ring structure from a second perspective in this embodiment;

[0035] Figure 4 for Figure 3 A magnified view of a portion of the image;

[0036] Figure 5 This is a partial schematic diagram of the internal gear ring structure in this embodiment;

[0037] Figure 6 This is a schematic diagram of the gearbox in this embodiment.

[0038] icon:

[0039] 100-Gear body; 200-External spline; 201-First lubrication groove; 202-Second lubrication groove; 210-Annular body; 220-Spline tooth; 221-Guiding slope; 230-Spline groove; 231-Groove bottom wall; 001-Box body. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0041] 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 claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0042] It should be noted that similar labels 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.

[0043] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product is usually placed during use, they are only for the convenience of describing this 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, and therefore should not be construed as a limitation of this utility model.

[0044] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0045] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.

[0046] Please refer to Figures 1-6 This embodiment provides an internal gear ring structure, including:

[0047] The gear body 100 and the external spline 200 are integral. The external spline 200 includes multiple spline teeth 220, which are distributed on the outer circumferential surface of the gear body 100. The multiple spline teeth 220 are spaced apart in the circumferential direction of the gear body 100. Each spline tooth 220 is drum-shaped, and the thickness of each spline tooth 220 gradually decreases from the middle to both ends. The thickness direction of the spline tooth 220 is consistent with the circumferential direction of the gear body 100.

[0048] As described above, the internal gear ring structure provided in this embodiment has at least the following advantages:

[0049] The internal gear ring structure includes an integral gear body 100 and an external spline 200. The external spline 200 includes multiple spline teeth 220, which are distributed on the outer circumferential surface of the gear body 100. Each spline tooth 220 is drum-shaped, meaning that the thickness of each spline tooth 220 gradually decreases from its center to both ends, and the thickness direction of the spline tooth 220 is consistent with the circumferential direction of the gear body 100. By making the spline teeth 220 drum-shaped, each spline tooth 220 has two opposing drum-shaped tooth surfaces in the circumferential direction of the gear body 100. The drum-shaped tooth surfaces can improve the floating ability of the internal gear ring structure, allowing it to float along a drum-shaped trajectory, reducing floating impact and vibration noise. This improves the spline fit and eccentricity during gear ring floating, reduces wear rate, reduces vibration noise generated during operation, extends the service life of the internal gear ring structure, and reduces maintenance costs.

[0050] The following embodiments illustrate the details of the internal gear ring structure of this application by way of example.

[0051] Please refer to Figures 1-6 In this embodiment, optionally, the internal gear ring structure includes an integral gear body 100 and an external spline 200. The external spline 200 is located on the outer circumferential surface of the gear body 100, and the two are coaxially arranged. They can be integrally formed by casting, etc.

[0052] The gear body 100 is configured with an internal gear structure, and the gear body 100 can mesh with planetary gears and other components inserted therein to achieve torque transmission.

[0053] Optionally, the external spline 200 includes an integral annular body 210 and multiple spline teeth 220. The annular body 210 is located on the outer circumferential surface of the gear body 100 and is coaxially arranged with the gear body 100. The multiple spline teeth 220 are all located on the outer circumferential surface of the annular body 210 and are evenly spaced in the circumferential direction of the annular body 210. There is a gap between any two adjacent spline teeth 220, forming a spline groove 230. The bottom wall 231 of the spline groove 230 can be set as a convex arc surface, that is, the distance between the bottom wall 231 and the axis of the gear body 100 gradually decreases from the middle of the bottom wall 231 to both sides. The arc surface can be a circular arc surface, which is convenient for processing. The bottom wall 231 of the spline groove 230 is arc-shaped along the tooth direction, that is, the tooth root of the spline tooth 220 is arc-shaped along the tooth direction, forming the characteristics of the gear rim of the internal gear ring being thin at both ends and thick in the middle, and the spline tooth 220 being high at both ends and low in the middle. This feature is conducive to the flexible deformation of the thin rim at both ends of the internal gear ring, so that the contact patch of the gear and spline tooth 220 surfaces tends to be in the middle; it is also conducive to the elastic deformation of the spline tooth 220 and the internal gear rim, improving the elastic load-sharing effect.

[0054] Meanwhile, the spline teeth 220 are configured with a drum-shaped structure, and the thickness of each spline tooth 220 gradually decreases from the middle to both ends. The thickness direction of the spline teeth 220 is consistent with the circumferential direction of the gear body 100. By configuring the spline teeth 220 with a drum shape, each spline tooth 220 has two opposing drum-shaped tooth surfaces in the circumferential direction of the gear body 100. The drum-shaped tooth surfaces can improve the floating ability of the internal gear ring structure, allowing it to float along the drum-shaped trajectory, reducing floating impact and vibration noise. This improves the spline fit off-center loading and eccentricity during gear ring floating, reduces wear rate, reduces vibration noise generated during operation, extends the service life of the internal gear ring structure, and reduces maintenance costs.

[0055] Furthermore, each spline tooth 220 has guide ramps 221 on both sides of the outer spline 200 in the axial direction. The outer sides of the two guide ramps 221 move inward, which facilitates the meshing of the spline tooth 220 with the inner spline in the housing 001 and also facilitates the guidance of lubricating oil.

[0056] It should be understood that the number of spline teeth 220 is designed as needed, and no specific limit is made in this embodiment.

[0057] Please refer to Figures 1-2Optionally, the external spline 200 has a first end face and a second end face disposed opposite to each other in its axial direction. A plurality of first lubrication grooves 201 and a plurality of second lubrication grooves 202 are provided on the first end face and / or the second end face. Both the first lubrication grooves 201 and the second lubrication grooves 202 can be configured as arc-shaped grooves, that is, the cross-sectional profile of the first lubrication grooves 201 and the second lubrication grooves 202 is arc-shaped, and the cross-section is a plane perpendicular to its own length direction. The plurality of first lubrication grooves 201 are evenly spaced apart in the circumferential direction of the annulus 210, and the plurality of second lubrication grooves 202 are also evenly spaced apart in the circumferential direction of the annulus 210. Furthermore, multiple first lubrication grooves 201 and multiple second lubrication grooves 202 are arranged alternately in the circumferential direction of the annulus 210. That is, in the circumferential direction of the annulus 210, there is a second lubrication groove 202 between any two adjacent first lubrication grooves 201, and similarly, there is a first lubrication groove 201 between any two adjacent second lubrication grooves 202. Simultaneously, the number of first lubrication grooves 201 is equal to the number of spline grooves 230, and one end of each first lubrication groove 201 is connected to the corresponding spline groove 230. The number of second lubrication grooves 202 is equal to the number of spline teeth 220, and one end of each second lubrication groove 202 extends to the guide slope 221 of the corresponding spline tooth 220. With this design, the first lubrication groove 201, the second lubrication groove 202 and the arc-shaped groove bottom wall 231 cooperate to guide the lubricating oil to the meshing position between the external spline 200 and the housing 001, thereby lubricating the external spline 200 and forming a lubricating oil film on the surface of the external spline 200. This reduces the wear and impact on the tooth surface and end face of the external spline 200, extends its service life, and improves the stability and reliability of operation.

[0058] It should be understood that a first lubrication groove 201 and a second lubrication groove 202 can be provided on both the first end face and the second end face to improve the oil guiding ability and improve the lubrication effect.

[0059] Optionally, the spline teeth 220 and the annular body 210 have equal dimensions in the axial direction of the external spline 200. Simultaneously, both the first and second end faces are planar. One side of each spline tooth 220 mates with one annular surface of the annular body 210 to form the first end face, and the other side of each spline tooth 220 mates with another annular surface of the annular body 210 to form the second end face. The distance between the first and second end faces is equal to the thickness of the external spline 200. The thickness of the external spline 200 is greater than the thickness of the gear body 100. Furthermore, after the external spline 200 and the gear body 100 are integrally formed, the first and second end faces of the external spline 200 both protrude from the corresponding end faces of the gear body 100. With this design, when the internal gear ring structure is assembled with the housing 001, the end face of the external spline 200 contacts the end face of the gearbox to achieve limiting, reducing the wear on the gear end face of the gear body 100. It also facilitates the entry of lubricating oil from the radial direction of the gear body 100 into the first lubrication groove 201 and the second lubrication groove 202, thereby lubricating the tooth surface and end face of the external spline 200.

[0060] The internal gear ring structure provided in this embodiment, by setting the spline teeth 220 as a drum-shaped structure, has two drum-shaped tooth surfaces facing each other in the circumferential direction of the gear body 100. The drum-shaped tooth surfaces can improve the floating ability of the internal gear ring structure, allowing it to float along the drum-shaped trajectory, reducing floating impact and vibration noise, thereby improving the spline fit off-center loading and eccentricity during the gear ring floating process, reducing wear rate, and reducing vibration noise generated during operation. At the same time, the spline groove 230 of the external spline 200 is a convex arc-shaped surface. On the two end faces of the external spline 200 in the axial direction, a first lubrication groove 201 and a second lubrication groove 202 are arranged alternately in sequence. When the gearbox is running, when the lubricating oil agitated by the gear moves radially, it can pass through the first lubrication groove 201 and the second lubrication groove 202, thereby effectively lubricating the external spline 200 and reducing wear and impact. Because the side of the spline 220 is provided with a guide slope 221, it not only facilitates the meshing of the external spline 200 with the internal spline of the housing 001, but also improves the oil storage capacity and lubrication effect.

[0061] Please refer to Figure 6 This embodiment also provides a gearbox, which includes a housing 001 and an internal gear ring structure, with an external spline 200 inserted into the housing 001 and having an interference fit with the housing 001.

[0062] Optionally, the housing 001 is equipped with an internal spline, with the external spline 200 meshing with the internal spline. During gearbox operation, lubricating oil is easily guided to the meshing position of the external spline 200 and the internal spline, resulting in good lubrication and reducing clearance wear and impact. Simultaneously, because the spline teeth 220 are drum-shaped, the floating capability of the internal gear ring structure is enhanced, allowing it to float along a drum-shaped trajectory, reducing floating impact and vibration noise. This improves the off-center loading and eccentricity of the spline fit during gear ring floating, reduces wear rate, and decreases vibration noise generated during operation.

[0063] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. An internal gear ring structure, characterized in that, include: The gear body (100) and external spline (200) are integrated. The external spline (200) includes multiple spline teeth (220). The multiple spline teeth (220) are distributed on the outer peripheral surface of the gear body (100). The multiple spline teeth (220) are arranged at intervals in the circumferential direction of the gear body (100). Each of the spline teeth (220) is drum-shaped, and the thickness of each spline tooth (220) gradually decreases from the middle to both ends; the thickness direction of the spline tooth (220) is consistent with the circumferential direction of the gear body (100).

2. The internal gear ring structure according to claim 1, characterized in that: In the circumferential direction of the gear body (100), a spline groove (230) is formed between any two adjacent spline teeth (220). The bottom wall (231) of the spline groove (230) is set as an outwardly convex arc surface. The distance between the bottom wall (231) of the groove and the axis of the gear body (100) gradually decreases from the middle of the bottom wall (231) to both sides.

3. The internal gear ring structure according to claim 2, characterized in that: The external spline (200) has a first end face and a second end face that are disposed opposite to each other in the extension direction of the axis of the gear body (100), and a first lubrication groove (201) communicating with the spline groove (230) is provided on the first end face and / or the second end face.

4. The internal gear ring structure according to claim 3, characterized in that: The first lubrication groove (201) is configured as an arc-shaped groove.

5. The internal gear ring structure according to claim 1, characterized in that: The external spline (200) has a first end face and a second end face opposite each other in the extension direction of the axis of the gear body (100), the first end face and / or the second end face protruding from the gear body (100) in the extension direction of the axis of the gear body (100).

6. The internal gear ring structure according to claim 5, characterized in that: Multiple guide slopes (221) are provided on the first end face and / or the second end face, and the multiple guide slopes (221) are respectively connected to the outer peripheral surfaces of the multiple spline teeth (220).

7. The internal gear ring structure according to claim 6, characterized in that: A second lubrication groove (202) is provided on the first end face and / or the second end face, and one end of the second lubrication groove (202) extends to the corresponding guide slope (221).

8. The internal gear ring structure according to claim 7, characterized in that: The second lubrication groove (202) is configured as an arc-shaped groove.

9. A gearbox, characterized in that, The gearbox includes: The housing (001) and the internal gear ring structure according to any one of claims 1-8, wherein the external spline (200) is inserted into the housing (001) and is interference-fitted with the housing (001).

10. The gearbox according to claim 9, characterized in that: The housing (001) is provided with an internal spline, and the external spline (200) engages with the internal spline.

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