Lightweight output gear shaft

Abstract

A lightweight output gear shaft relates to the field of gearboxes and comprises a shaft body and a gear body which are connected, one end, away from the gear body, of the shaft body is provided with a first end face, and one end, away from the shaft body, of the gear body is provided with a second end face; the outer diameter of the first end face is smaller than that of the second end face. A lightening hole is formed in the second end surface; the profile of the cross section of each lightening hole is round, the diameter of the end, located on the second end face, of each lightening hole is D, D is larger than or equal to (Df-7M) and smaller than or equal to (Df-1. 5M), in the formula, Df is the diameter of the root circle of the gear body, and M is the gear modulus of the gear body. The structure strength of the output gear shaft can be guaranteed while the weight, the size and the cost are reduced.

Description

Technical Field

[0001] This invention relates to the field of gearboxes, and more specifically, to a lightweight output gear shaft. Background Technology Yaw and pitch gearboxes typically employ planetary transmissions. The output end is supported and positioned by two back-to-back tapered roller bearings, with the output shaft connected to the planetary carrier via external or internal splines. Specifically, the two bearings are directly mounted on the output shaft and preloaded using round nuts. The overall length of the output assembly is determined by Ls + L1 + Ln + Lb + L2. Among these, the spline fit length Ls and the bearing pair width Lb (the widths of the two bearings + the bearing span) affect the gearbox's reliability. Due to limitations in spline and bearing bore dimensions, these lengths are generally quite long. The remaining dimensions—spline relief groove width L1, round nut width Ln, and seal width L2—do not affect the gearbox's strength but increase the height and weight of the output assembly.

[0002] In summary, the output gear shafts of existing technologies are generally large in size and weight, and have high costs. Summary of the Invention

[0003] The object of the present invention includes, for example, providing a lightweight output gear shaft that can reduce weight, size and cost while maintaining the structural strength of the output gear shaft.

[0004] The embodiments of the present invention can be implemented as follows: In a first aspect, the present invention provides a lightweight output gear shaft, comprising: A shaft body and a gear body are connected. The end of the shaft body away from the gear body is designated as a first end face, and the end of the gear body away from the shaft body is designated as a second end face. The outer diameter of the first end face is smaller than the outer diameter of the second end face. A weight-reducing hole is provided on the second end face. The cross-sectional profile of the weight-reducing hole is circular, and the diameter of the end of the weight-reducing hole located on the second end face is D, where (Df-7M)≤D≤(Df-1.5M), and Df is the root circle diameter of the gear body, and M is the gear module of the gear body.

[0005] In an optional embodiment, the weight-reducing hole is coaxial with the shaft body, and the weight-reducing hole includes a first variable diameter hole section, the diameter of which gradually decreases in the direction from the second end face to the first end face; the port of the first variable diameter hole section is located on the second end face; the longitudinal cross-sectional profile of the weight-reducing hole is a first conical surface, and the central angle of the first conical surface is θ1. ; In the formula, Db is the diameter of the end where the shaft body connects to the gear body, and L1 is the axial dimension of the gear body.

[0006] In an optional embodiment, the weight-reducing hole is configured as a blind hole, and the end of the weight-reducing hole away from the second end face has a distance t1 from the first end face, where t1 ≥ 5 mm.

[0007] In an optional embodiment, the weight reduction hole further includes a second variable diameter hole section that connects to the first variable diameter hole section. The diameter of the second variable diameter hole section gradually increases in the direction from the second end face to the first end face, and the end of the second variable diameter hole section away from the second end face is located on the first end face.

[0008] In an optional embodiment, the longitudinal cross-sectional profile of the second variable diameter hole section is a second conical surface, and the central angle of the second conical surface is θ2; ; In the formula, L2 is the axial dimension of the shaft body.

[0009] In an optional embodiment, the weight reduction hole further includes a constant diameter hole section, which connects the first variable diameter hole section and the second variable diameter hole section. The length of the constant diameter hole section is t2, where t2 ≥ 5 mm.

[0010] In an optional embodiment, the shaft body is provided with an external spline; The diameter of the end of the weight-reducing hole furthest from the second end face is D1, where D1 ≤ (df1 - 2m1), df1 is the diameter of the root circle of the external spline, and m1 is the module of the external spline.

[0011] In an optional embodiment, the weight-reducing hole is configured as a through hole of equal diameter, and the diameter of the weight-reducing hole is Dd, where Dd≤Min(Df-2M, df1-2m1, 0.9Db).

[0012] In an optional embodiment, the first end face is provided with a spline hole, and an internal spline is formed on the wall of the spline hole; The diameter of the root circle of the internal spline is df2, df2≤(dw-2m2), where dw is the diameter of the first end face and m2 is the module of the internal spline. The end of the weight-reducing hole away from the second end face is connected to the spline hole; the diameter of the end of the weight-reducing hole away from the second end face is D2, D2≤da, where da is the diameter of the tip circle of the internal spline.

[0013] In an optional embodiment, the weight-reducing hole is configured as a through hole of equal diameter, and the diameter of the weight-reducing hole is Dd, where Dd≤Min(Df-2M, df2-2m2, 0.9Db).

[0014] Secondly, the present invention provides a lightweight output gear shaft, comprising: A connected shaft body and a gear body, wherein the end of the shaft body away from the gear body is designated as a first end face, and the end of the gear body away from the shaft body is designated as a second end face; the outer diameter of the first end face is smaller than the outer diameter of the second end face; The shaft body is provided with an external spline; A weight-reducing hole is provided on the first end face; the cross-sectional profile of the weight-reducing hole is circular, and the diameter of one end of the weight-reducing hole located on the first end face is D1, where D1≤(df1-2m1), df1 is the diameter of the root circle of the external spline, and m1 is the module of the external spline.

[0015] Thirdly, the present invention provides a lightweight output gear shaft, comprising: A connected shaft body and a gear body, wherein the end of the shaft body away from the gear body is designated as a first end face, and the end of the gear body away from the shaft body is designated as a second end face; the outer diameter of the first end face is smaller than the outer diameter of the second end face; The shaft body is provided with a spline hole, and an internal spline is formed on the wall of the spline hole; A weight-reducing hole is provided on the first end face; the cross-sectional profile of the weight-reducing hole is circular; the end of the weight-reducing hole away from the second end face is connected to the spline hole; the diameter of the end of the weight-reducing hole away from the second end face is D2, D2≤da, where da is the diameter of the tooth tip circle of the internal spline.

[0016] In an optional embodiment, the diameter of the root circle of the internal spline is df2, df2≤(dw-2m2), where dw is the diameter of the first end face and m2 is the module of the internal spline.

[0017] The beneficial effects of the embodiments of the present invention include, for example: In summary, the lightweight output gear shaft provided in this embodiment includes a connected shaft body and a gear body. By opening a weight-reducing hole on the second end face of the gear body away from the shaft body, the weight of the output gear shaft can be effectively reduced, saving materials and reducing manufacturing costs. Furthermore, the diameter of the end of the weight-reducing hole on the second end face is D, where (Df-7M)≤D≤(Df-1.5M), where Df is the root circle diameter of the gear body and M is the gear module of the gear body. That is, by rationally designing the port diameter of the weight-reducing hole, sufficient strength can be ensured for both the shaft body and the gear body while reducing weight. This results in a strong load-bearing capacity for the output gear shaft, stable and reliable support, and safe and reliable operation of the entire gearbox. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention 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.

[0019] Figure 1 This is a schematic diagram of a first example of a lightweight output gear shaft in this embodiment; Figure 2 This is a schematic diagram of a second example of the lightweight output gear shaft in this embodiment; Figure 3 This is a schematic diagram of a third example of the lightweight output gear shaft in this embodiment; Figure 4 This is a schematic diagram of a fourth example of the lightweight output gear shaft in this embodiment; Figure 5 This is a schematic diagram of the fifth example of the lightweight output gear shaft in this embodiment; Figure 6 This is a schematic diagram of a sixth example of the lightweight output gear shaft in this embodiment; Figure 7 This is a schematic diagram of the seventh example of the lightweight output gear shaft in this embodiment; Figure 8 This is a schematic diagram of the eighth example of the lightweight output gear shaft in this embodiment; Figure 9 This is a schematic diagram of the ninth example of the lightweight output gear shaft in this embodiment; Figure 10 This is a schematic diagram of the tenth example of the lightweight output gear shaft in this embodiment; Figure 11 This is a schematic diagram of the eleventh example of the lightweight output gear shaft in this embodiment; Figure 12 This is a schematic diagram of the twelfth example of the lightweight output gear shaft in this embodiment; Figure 13 This is a schematic diagram of the thirteenth example of the lightweight output gear shaft in this embodiment; Figure 14 This is a schematic diagram of the fourteenth example of the lightweight output gear shaft in this embodiment; Figure 15 The stress and strain distribution diagrams of a solid shaft in the prior art are shown; Figure 16 The stress and strain distribution diagram of the lightweight output gear shaft of this embodiment is shown.

[0020] icon: 100 - Shaft body; 101 - First end face; 102 - Spline hole; 110 - First shaft section; 120 - Second shaft section; 130 - Third shaft section; 140 - External spline; 150 - Internal spline; 200 - Gear body; 201 - Second end face; 300 - Weight reduction hole; 310 - First diameter changing hole section; 320 - Second diameter changing hole section; 330 - Equal diameter hole section. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the 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 invention without inventive effort are within the scope of protection of the invention.

[0023] 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.

[0024] In the description of this invention, 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 of this invention is usually placed, they are only for the convenience of describing this invention 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 invention.

[0025] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0026] It should be noted that, where there is no conflict, the features in the embodiments of the present invention can be combined with each other.

[0027] Please refer to Figures 1-14 This embodiment provides a lightweight output gear shaft, including: The shaft body 100 and gear body 200 are connected. The end of the shaft body 100 away from the gear body 200 is set as the first end face 101, and the end of the gear body 200 away from the shaft body 100 is set as the second end face 201. The outer diameter of the first end face 101 is smaller than the outer diameter of the second end face 201. A weight reduction hole 300 is provided on the second end face 201. The cross-sectional profile of the weight reduction hole 300 is circular. The diameter of the end of the weight reduction hole 300 located on the second end face 201 is D, (Df-7M)≤D≤(Df-1.5M), where Df is the root circle diameter of the gear body 200 and M is the gear module of the gear body 200.

[0028] As described above, the lightweight output gear shaft provided in this embodiment has at least the following advantages: The lightweight output gear shaft includes a connected shaft body 100 and a gear body 200. By creating a weight-reducing hole 300 on the second end face 201 of the gear body 200 away from the shaft body 100, the weight of the output gear shaft can be effectively reduced, saving materials and lowering manufacturing costs. Simultaneously, the diameter of the end of the weight-reducing hole 300 located on the second end face 201 is D, where (Df-7M)≤D≤(Df-1.5M), where Df is the root circle diameter of the gear body 200, and M is the gear module of the gear body 200. In other words, a well-designed end diameter of the weight-reducing hole 300 ensures sufficient strength of the shaft body 100 while reducing weight, resulting in a strong load-bearing capacity, stable and reliable support for the output gear shaft, and safe and reliable operation of the entire gearbox.

[0029] It should be understood that the output gear shaft can be configured as a single-piece structure, that is, the shaft body 100 and the gear body 200 are a single-piece structure, which facilitates processing and manufacturing, is suitable for mass production, and has low processing and manufacturing costs. At the same time, it has high structural strength and long service life.

[0030] The following embodiments illustrate the details of the lightweight output gear shaft of this application by way of example.

[0031] Please refer to Figures 1-4 In one embodiment, when the shaft body 100 is configured as an elongated shaft, it can be configured as a stepped structure. For example, the shaft body 100 includes a first shaft segment 110, a second shaft segment 120, and a third shaft segment 130 connected in sequence. The first shaft segment 110, the second shaft segment 120, and the third shaft segment 130 are all shaft segments of equal diameter, with their diameters increasing sequentially. The gear body 200 is located on the end face of the third shaft segment 130 away from the second shaft segment 120. The end face of the first shaft segment 110 away from the second shaft segment 120 is the first end face 101. Simultaneously, an external spline 140 can be provided on the outer circumferential surface of the first shaft segment 110. Furthermore, bearings for supporting the shaft body 100 can be provided on both the first shaft segment 110 and the third shaft segment 130.

[0032] Optionally, a weight-reducing hole 300 is provided on the second end face 201 of the gear body 200. The weight-reducing hole 300 can be a blind hole. Furthermore, the weight-reducing hole 300 may include a first variable diameter hole section 310, one end of which is located on the second end face 201. The diameter of the first variable diameter hole section 310 gradually decreases in the direction from the second end face 201 to the first end face 101. The port of the first variable diameter hole section 310 is located on the second end face 201. The longitudinal cross-sectional profile of the first variable diameter hole section 310 is a first conical surface.

[0033] Meanwhile, the diameter of the port of the first variable diameter bore section 310 located on the second end face 201 is D, (Df-7M)≤D≤(Df-1.5M), where Df is the root circle diameter of the gear body 200 and M is the gear module of the gear body 200. The diameter of the port of the first variable diameter bore section 310 away from the second end face 201 is D1, D1≤(df1-2m1), where df1 is the root circle diameter of the external spline 140 and m1 is the module of the external spline 140. Since the weight reduction hole 300 is a blind hole, the end of the weight reduction hole 300 away from the second end face 201 has a distance t1 from the first end face 101, t1≥5mm. This design can reduce the weight of the output gear shaft while ensuring the structural strength of the gear body 200.

[0034] Furthermore, the central angle of the first conical surface is θ1; ; In the formula, Db is the diameter of the end where the shaft body 100 connects to the gear body 200, that is, Db is the outer diameter of the third shaft segment 130; L1 is the axial dimension of the gear body 200, that is, the distance between the end face of the third shaft segment 130 away from the second shaft segment 120 and the second end face 201. This design can reduce weight, facilitate the processing and manufacturing of the output gear shaft, reduce processing and manufacturing costs, and ensure that the output gear shaft has sufficient structural strength.

[0035] Optionally, the weight-reducing hole 300 may further include a constant-diameter section connecting the first variable-diameter hole section 310. In some embodiments, the diameter of the constant-diameter section may be equal to the diameter of the port of the weight-reducing hole 300 away from the second end face 201.

[0036] In another embodiment, optionally, the shaft body 100 can be a short and thick equal-diameter shaft, and an external spline 140 is provided on the outer peripheral surface of the end of the shaft body 100 away from the gear body 200. In this case, the weight reduction hole 300 can be set as a through hole, that is, the end of the weight reduction hole 300 away from the second end face 201 can extend to the first end face 101.

[0037] Please refer to Figure 5For example, in one embodiment, optionally, the weight-reducing hole 300 further includes a second variable-diameter hole section 320 communicating with the first variable-diameter hole section 310. The diameter of the second variable-diameter hole section 320 gradually increases in the direction from the second end face 201 to the first end face 101, and the end of the second variable-diameter hole section 320 away from the second end face 201 is located on the first end face 101. The longitudinal cross-sectional profile of the second variable-diameter hole section 320 is a second conical surface, and the central angle of the second conical surface is θ2. ; In the formula, L2 is the axial dimension of the shaft body 100, that is, L2 is the sum of the axial dimensions of the first shaft segment 110, the second shaft segment 120 and the third shaft segment 130. This design can reduce weight and facilitate the forming of the weight-reducing hole 300, thereby reducing the processing and manufacturing cost of the output gear shaft, and also ensuring that the output gear shaft has sufficient structural strength.

[0038] Please refer to Figure 6 In another embodiment, optionally, the weight-reducing hole 300 further includes a constant-diameter hole section 330 communicating with the first variable-diameter hole section 310 and a second variable-diameter hole section 320 communicating with the constant-diameter hole section 330. That is, in the axial direction of the shaft body 100, the weight-reducing hole 300 includes the first variable-diameter hole section 310, the constant-diameter hole section 330, and the second variable-diameter hole section 320 connected in sequence. The length of the constant-diameter hole section 330 is t2, where t2 ≥ 5 mm. The constant-diameter hole section 330 can be a smooth through hole or a threaded hole, capable of screwing in a magnetic plug. Furthermore, the design of the constant-diameter hole section 330 facilitates the timely discharge of quenching liquid during heat treatment, improving the heat treatment effect. The diameter of the constant-diameter hole section 330 is smaller than the diameter of the first variable-diameter hole section 310 and the second variable-diameter hole section 320.

[0039] It should be noted that the longitudinal cross-sectional profile of the second variable diameter hole section 320 is a second conical surface, and the central angle of the second conical surface is θ2. ; In the formula, L2 is the axial dimension of the shaft body 100, that is, L2 is the sum of the axial dimensions of the first shaft segment 110, the second shaft segment 120 and the third shaft segment 130. This design can reduce weight and facilitate the forming of the weight-reducing hole 300, thereby reducing the processing and manufacturing cost of the output gear shaft, and also ensuring that the output gear shaft has sufficient structural strength.

[0040] Please refer to Figure 7It should be understood that in some embodiments, when the shaft body 100 is provided with an external spline 140, the weight reduction hole 300 can also be set as a through hole of equal diameter, the diameter of the weight reduction hole 300 is Dd, Dd≤Min(Df-2M, df1-2m1, 0.9Db), Df is the root circle diameter of the gear body 200, M is the gear module of the gear body 200, df1 is the root circle diameter of the external spline 140, m1 is the module of the external spline 140, and Db is the diameter of the end of the shaft body 100 connected to the gear body 200.

[0041] Please refer to Figures 8-9 It should be noted that, under the premise that the shaft body 100 is set as a short and thick equal diameter shaft and the weight reduction hole 300 is set as a through hole, the external spline 140 on the shaft body 100 can be adjusted to an internal spline 150. That is, a spline hole 102 is provided on the first end face 101 of the shaft body 100 away from the gear body 200, and an internal spline 150 is formed on the hole wall of the spline hole 102.

[0042] Meanwhile, the diameter of the root circle of the internal spline 150 is df2, df2≤(dw-2m2), where dw is the diameter of the first end face 101 and m2 is the module of the internal spline 150. It should be understood that under the condition that the shaft body 100 is a shaft of constant diameter, dw=Db, that is, both dw and Db represent the outer diameter of the shaft body 100.

[0043] Due to the design of the spline hole 102, it occupies part of the internal space of the shaft body 100. At this time, the end of the second variable diameter hole section 320 away from the first variable diameter hole section 310 is connected to the spline hole 102. The end of the second variable diameter hole section 320 away from the first variable diameter hole section 310 has a gap with the first end face 101, which is the axial dimension of the spline hole 102. The diameter of the end of the second variable diameter hole section 320 away from the first variable diameter hole section 310 is D2, that is, the diameter of the end of the second variable diameter hole section 320 connected to the spline hole 102 is D2, D2≤da, where da is the diameter of the tooth tip circle of the internal spline 150.

[0044] It should be understood that, in this embodiment, optionally, the weight reduction hole 300 can also be set as a through hole of equal diameter, the diameter of the weight reduction hole 300 is Dd, Dd≤Min(Df-2M, df1-2m1, 0.9Db), Df is the root circle diameter of the gear body 200, M is the gear module of the gear body 200, df1 is the root circle diameter of the external spline 140, m1 is the module of the external spline 140, and Db is the diameter of the end of the shaft body 100 connected to the gear body 200.

[0045] Please combine Figure 10In some embodiments, optionally, when the shaft body 100 is provided with a spline hole 102 and an internal spline 150 is formed on the hole wall of the spline hole 102, the weight reduction hole 300 can also be set as a through hole of equal diameter. The diameter of the weight reduction hole 300 is Dd, Dd≤Min(Df-2M, df2-2m2, 0.9Db), where Df is the root circle diameter of the gear body 200, M is the gear module of the gear body 200, df2 is the root circle diameter of the internal spline 150, m2 is the module of the internal spline 150, and Db is the diameter of the end of the shaft body 100 connected to the gear body 200, that is, the outer diameter of the shaft body 100.

[0046] Please combine Figures 11-14 In other embodiments, optionally, when the shaft body 100 is configured as a short and thick shaft and is provided with an external spline 140, a variable-diameter weight-reducing hole 300 can be provided on the first end face 101. The diameter of the weight-reducing hole 300 gradually decreases in the direction from the first end face 101 to the second end face 201, and the weight-reducing hole 300 can be a blind hole. The weight-reducing hole 300 and the second end face 201 have a distance t3, where t3 ≥ 5 mm. The diameter of the end of the weight-reducing hole 300 located on the first end face 101 is D1, where D1 ≤ (df1 - 2m1), df1 is the diameter of the root circle of the external spline 140, and m1 is the module of the external spline 140. The longitudinal cross-sectional profile of the weight-reducing hole 300 is a second conical surface, and the central angle of the second conical surface is θ2. ; In the formula, L2 is the axial dimension of the shaft body 100, and Db is the outer diameter of the shaft body 100. This design can reduce weight and facilitate the forming of the weight-reducing hole 300, thereby reducing the processing and manufacturing cost of the output gear shaft, while also ensuring that the output gear shaft has sufficient structural strength.

[0047] In other embodiments, optionally, when the shaft body 100 is configured as a short and thick shaft and is provided with a spline hole 102, an internal spline 150 is formed on the hole wall of the spline hole 102. A variable-diameter weight-reducing hole 300 communicating with the spline hole 102 can be provided inside the shaft body 100. The weight-reducing hole 300 is located at the end of the spline hole 102 away from the first end face 101. The diameter of the weight-reducing hole 300 gradually decreases in the direction from the first end face 101 to the second end face 201, and the weight-reducing hole 300 can be a blind hole. The weight-reducing hole 300 and the second end face 201 have a distance t3, where t3 ≥ 5 mm. The diameter of the end of the weight-reducing hole 300 communicating with the spline hole 102 is D1, where D1 ≤ (df2 - 2m2), df2 is the diameter of the root circle of the external spline 140, and m2 is the module of the external spline 140. The longitudinal cross-sectional profile of the weight reduction hole 300 is a second conical surface, and the central angle of the second conical surface is θ2; ; In the formula, L2 is the axial dimension of the shaft body 100, and Db is the outer diameter of the shaft body 100. This design can reduce weight and facilitate the forming of the weight-reducing hole 300, thereby reducing the processing and manufacturing cost of the output gear shaft, while also ensuring that the output gear shaft has sufficient structural strength.

[0048] Please refer to Figure 15 and Figure 16 ,in, Figure 15 The stress and strain distribution diagram of a solid shaft in the prior art is shown. Figure 16 The stress and strain distribution diagrams of the lightweight output gear shaft of this embodiment are shown. Comparative analysis shows that, compared with the existing robust shaft, the maximum stress of the lightweight output gear shaft design of this embodiment is increased by about 1%, the local maximum strain is increased by about 3.3%, and the strength and stiffness remain basically unchanged. The optimized stress and strain distribution of the output shaft is reasonable, meets the allowable requirements of most surface-hardening steels, and can more effectively and fully utilize the material properties, possessing both economic viability and conditions for widespread application.

[0049] The lightweight output gear shaft provided in this embodiment is not only lightweight, requires less material, and has low processing and manufacturing costs, but also has high structural strength, long service life, and is safe and reliable to use.

[0050] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention 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 the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A lightweight output gear shaft, characterized in that, include: A shaft body (100) and a gear body (200) are connected. The end of the shaft body (100) away from the gear body (200) is set as a first end face (101), and the end of the gear body (200) away from the shaft body (100) is set as a second end face (201). The outer diameter of the first end face (101) is smaller than the outer diameter of the second end face (201). A weight-reducing hole (300) is provided on the second end face (201). The cross-sectional profile of the weight-reducing hole (300) is circular. The diameter of the end of the weight-reducing hole (300) located on the second end face (201) is D, (Df-7M)≤D≤(Df-1.5M), where Df is the root circle diameter of the gear body (200), and M is the gear module of the gear body (200).

2. The lightweight output gear shaft according to claim 1, characterized in that: The weight-reducing hole (300) is coaxial with the shaft body (100). The weight-reducing hole (300) includes a first variable diameter hole section (310), the diameter of which gradually decreases from the second end face (201) to the first end face (101). The port of the first variable diameter hole section (310) is located on the second end face (201). The longitudinal cross-sectional profile of the weight-reducing hole (300) is a first conical surface, and the central angle of the first conical surface is θ1. ； In the formula, Db is the diameter of the end where the shaft body (100) is connected to the gear body (200), and L1 is the axial dimension of the gear body (200).

3. The lightweight output gear shaft according to claim 2, characterized in that: The weight reduction hole (300) is set as a blind hole, and the end of the weight reduction hole (300) away from the second end face (201) has a distance t1 from the first end face (101), where t1 ≥ 5 mm.

4. The lightweight output gear shaft according to claim 2, characterized in that: The weight reduction hole (300) further includes a second variable diameter hole section (320) that connects to the first variable diameter hole section (310). The diameter of the second variable diameter hole section (320) gradually increases in the direction from the second end face (201) to the first end face (101), and the end of the second variable diameter hole section (320) away from the second end face (201) is located on the first end face (101).

5. The lightweight output gear shaft according to claim 4, characterized in that: The longitudinal cross-sectional profile of the second variable diameter hole section (320) is a second conical surface, and the central angle of the second conical surface is θ2; ； In the formula, L2 is the axial dimension of the shaft body (100).

6. The lightweight output gear shaft according to claim 5, characterized in that: The weight reduction hole (300) also includes a constant diameter hole section (330), which connects the first variable diameter hole section (310) and the second variable diameter hole section (320). The length of the constant diameter hole section (330) is t2, where t2 ≥ 5 mm.

7. The lightweight output gear shaft according to claim 1, characterized in that: An external spline (140) is provided on the shaft body (100); The diameter of the end of the weight reduction hole (300) away from the second end face (201) is D1, D1≤(df1-2m1), where df1 is the diameter of the root circle of the external spline (140) and m1 is the module of the external spline (140).

8. The lightweight output gear shaft according to claim 7, characterized in that: The weight reduction hole (300) is set as a through hole of equal diameter, and the diameter of the weight reduction hole (300) is Dd, Dd≤Min(Df-2M, df1-2m1, 0.9Db).

9. The lightweight output gear shaft according to claim 1, characterized in that: The first end face (101) is provided with a spline hole (102), and an internal spline (150) is formed on the hole wall of the spline hole (102). The diameter of the root circle of the internal spline (150) is df2, df2≤(dw-2m2), where dw is the diameter of the first end face (101) and m2 is the module of the internal spline (150). The end of the weight-reducing hole (300) away from the second end face (201) is connected to the spline hole (102); the diameter of the end of the weight-reducing hole (300) away from the second end face (201) is D2, D2≤da, where da is the diameter of the tooth tip circle of the internal spline (150).

10. The lightweight output gear shaft according to claim 9, characterized in that: The weight reduction hole (300) is set as a through hole of equal diameter, and the diameter of the weight reduction hole (300) is Dd, Dd≤Min(Df-2M, df2-2m2, 0.9Db).

11. A lightweight output gear shaft, characterized in that, include: A connected shaft body (100) and gear body (200) are provided, wherein the end of the shaft body (100) away from the gear body (200) is provided as a first end face (101), and the end of the gear body (200) away from the shaft body (100) is provided as a second end face (201); the outer diameter of the first end face (101) is smaller than the outer diameter of the second end face (201); An external spline (140) is provided on the shaft body (100); A weight-reducing hole (300) is provided on the first end face (101); the cross-sectional profile of the weight-reducing hole (300) is circular, and the diameter of the end of the weight-reducing hole (300) located on the first end face (101) is D1, D1≤(df1-2m1), df1 is the diameter of the root circle of the external spline (140), and m1 is the module of the external spline (140).

12. A lightweight output gear shaft, characterized in that, include: A connected shaft body (100) and gear body (200) are provided, wherein the end of the shaft body (100) away from the gear body (200) is provided as a first end face (101), and the end of the gear body (200) away from the shaft body (100) is provided as a second end face (201); the outer diameter of the first end face (101) is smaller than the outer diameter of the second end face (201); The shaft body (100) is provided with a spline hole (102), and an internal spline (150) is formed on the hole wall of the spline hole (102). A weight-reducing hole (300) is provided on the first end face (101); the cross-sectional profile of the weight-reducing hole (300) is circular; the end of the weight-reducing hole (300) away from the second end face (201) is connected to the spline hole (102); the diameter of the end of the weight-reducing hole (300) away from the second end face (201) is D2, D2≤da, where da is the diameter of the tooth tip circle of the internal spline (150).

13. The lightweight output gear shaft according to claim 12, characterized in that: The diameter of the root circle of the internal spline (150) is df2, df2≤(dw-2m2), where dw is the diameter of the first end face (101) and m2 is the module of the internal spline (150).

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