A helical angle end face tooth structure

Abstract

This utility model relates to the field of end face tooth technology, specifically a helical angle end face tooth structure, including end face teeth. The end face teeth are offset from the pitch circle diameter to form a helical angle, with the helical angle ranging from 0.15° to 0.25°. The offset of the center point of the end face teeth ranges from 0.05 mm to 0.15 mm. The advantages of this utility model are: through the coordinated design of the helical angle offset within the range of 0.15° to 0.25° and the displacement of the center point within the range of 0.05 to 0.15 mm, the end face teeth undergo radial elastic compensation deformation under axial locking force. Combined with the independently deformable double-tooth structure formed by U-shaped groove segmentation, the tooth surface fit is significantly improved. Compared to existing straight tooth meshing connections, this results in a tighter and less prone to loosening, eliminating starting noise during the connection of the automotive drive half-shaft housing. Furthermore, the geometric characteristic of no intersection between the tooth tip line and the tooth root line avoids local stress concentration, achieving uniform distribution of contact stress and improving overall load-bearing strength.

Description

Technical Field

[0001] This utility model relates to the field of end face tooth technology, and in particular to a helical angle end face tooth structure. Background Technology

[0002] Face gears, also known as face gears, are a special gear structure used for transmission between two intersecting or offset shafts, typically at a 90° angle. They evolved from the meshing of involute cylindrical gears and bevel gears. When the shaft angle is 90°, the teeth of the bevel gear are distributed on a circular plane, forming a face gear transmission.

[0003] However, existing face gears still have the following shortcomings in practical use:

[0004] Most existing face gears use right-angle face teeth, which results in a small contact area between the tooth surfaces during meshing, leading to insufficient meshing, weak resistance to centrifugal force, and easy generation of large vibrations at high speeds. They are also prone to abnormal noises during start-up, and the uneven stress distribution results in weak load-bearing capacity. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a helical angle end face tooth structure, which effectively solves the deficiencies of the prior art.

[0006] To achieve the above objectives, one embodiment of this utility model provides a helical angle end face tooth structure, including end face teeth. The end face teeth are offset from the pitch circle diameter to form a helical angle, the angle of which ranges from 0.15° to 0.25°. The offset of the center point of the end face teeth ranges from 0.05 mm to 0.15 mm. A U-shaped groove is formed at the center diameter of the end face teeth at 57 mm. The width of the U-shaped groove ranges from 0.8 to 1.2 mm, and the depth of the U-shaped groove ranges from 0.4 to 0.6 mm. The U-shaped groove divides the end face teeth into independently deformable first teeth and second teeth. The tooth tip line and tooth root line of the end face teeth do not intersect in three-dimensional space, and the tooth bisector of the end face teeth does not pass through the origin of the rotation axis.

[0007] This utility model has the following advantages:

[0008] This helical angle end face tooth structure, through the coordinated design of helical angle offset within the range of 0.15° to 0.25° and displacement of the center point within the range of 0.05 to 0.15 mm, enables the end face teeth to generate radial elastic compensation deformation under axial locking force. Combined with the independent deformable double tooth structure formed by U-shaped groove segmentation, it significantly improves the tooth surface fit. Compared with the existing straight tooth meshing connection, it is tighter and less prone to loosening, eliminates abnormal noise during start-up when connecting the automotive drive half shaft housing, and ensures that the geometric characteristics of the tooth end line and tooth root line have no intersection point to avoid local stress concentration, achieve uniform distribution of contact stress, and improve the overall load-bearing strength. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0010] Figure 2 This is a partial structural schematic diagram of the present invention;

[0011] Figure 3 This is a schematic diagram showing the end face parameters of this utility model;

[0012] Figure 4 This is a schematic diagram showing partial parameter annotations of this utility model;

[0013] Figure 5 This is a schematic diagram of the existing technology.

[0014] In the diagram: 1-end face tooth, 11-first tooth, 12-second tooth, 2-U-shaped groove. Detailed Implementation

[0015] The present invention will be further described below with reference to the accompanying drawings, but the scope of protection of the present invention is not limited to the following description.

[0016] like Figures 1 to 2 As shown, a helical angle end face tooth structure includes an end face tooth 1. The end face tooth 1 is offset from the pitch circle diameter to form a helical angle, the angle of which ranges from 0.15° to 0.25°. The offset of the center point of the end face tooth 1 ranges from 0.05 mm to 0.15 mm. A U-shaped groove 2 is formed at the center diameter of the end face tooth 1 at 57 mm. The groove width of the U-shaped groove 2 ranges from 0.8 to 1.2 mm, and the groove depth ranges from 0.4 to 0.6 mm. The U-shaped groove 2 divides the end face tooth 1 into an independently deformable first tooth 11 and a second tooth 12. The tooth tip line and tooth root line of the end face tooth 1 have no intersection in three-dimensional space, and the tooth bisector of the end face tooth 1 does not pass through the origin of the rotation axis.

[0017] Example 1:

[0018] The helix angle is 0.191°, the center point offset of the end face tooth 1 is 0.1 mm, the U-shaped groove 2 has a groove width of 1 mm and a groove depth of 0.5 mm, the ratio of the tooth tip width of the first tooth to the second tooth is 1:1.2, and the sidewall inclination angle of the U-shaped groove 2 is 90°.

[0019] Actual test results:

[0020] Tooth surface fit: The tooth surface contact rate reaches 99.5% after assembly;

[0021] Noise and vibration resistance: After 30 hill start tests on the automobile half-shaft bench, the occurrence rate of abnormal noise was 0%.

[0022] Stress distribution: The maximum contact stress is 280 MPa, which meets the requirement of uniform distribution.

[0023] Example 2:

[0024] The helix angle is 0.15°, the center point offset of the end face tooth 1 is 0.05 mm, the width of the U-shaped groove 2 is 0.8 mm and the depth is 0.4 mm, the ratio of the tooth tip width of the first tooth to the second tooth is 1:1.2, and the sidewall inclination angle of the U-shaped groove 2 is 85°.

[0025] Actual test results:

[0026] Tooth surface fit: The contact rate reaches 98.2% after bolt pre-tightening;

[0027] Noise and vibration resistance: The occurrence rate of abnormal noise was less than 0.8% in 30 bench start-up tests;

[0028] Stress distribution: Maximum contact stress is 298 MPa, achieving stress uniformity.

[0029] In summary, this utility model, through the coordinated design of a helix angle offset within the range of 0.15° to 0.25° and a center point displacement within the range of 0.05 to 0.15 mm, enables the end face teeth to undergo radial elastic compensation deformation under axial locking force. Combined with the independent deformable double-tooth structure formed by U-shaped groove segmentation, it significantly improves the tooth surface fit, resulting in a tighter and less prone to loosening connection compared to existing straight tooth meshing connections. This eliminates abnormal noise during start-up when connecting the automotive drive half-shaft housing and ensures that the geometric characteristics of the tooth end line and tooth root line without intersection points prevent local stress concentration, achieve uniform distribution of contact stress, and improve the overall load-bearing strength.

[0030] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A helical angle end face tooth structure, characterized in that: The device includes an end face tooth (1), which is offset from the pitch circle diameter to form a helix angle. The angle of the helix angle is in the range of 0.15° to 0.25°. The offset of the center point of the end face tooth (1) is in the range of 0.05 mm to 0.15 mm. A U-shaped groove (2) is provided at the center diameter of the end face tooth (1) at 57 mm. The groove width of the U-shaped groove (2) is in the range of 0.8 to 1.2 mm. The groove depth of the U-shaped groove (2) is in the range of 0.4 to 0.6 mm. The U-shaped groove (2) divides the end face tooth (1) into a first tooth (11) and a second tooth (12) that are deformed independently. The tooth tip line and tooth root line of the end face tooth (1) have no intersection in three-dimensional space. The tooth bisector of the end face tooth (1) does not pass through the origin of the rotation axis.

2. The helical angle end face tooth structure according to claim 1, characterized in that: The helix angle is 0.191°.

3. The helical angle end face tooth structure according to claim 1, characterized in that: The offset of the center point of the end face tooth (1) is 0.1 mm.

4. The helical angle end face tooth structure according to claim 1, characterized in that: The inclination angle of the sidewall of the U-shaped groove (2) ranges from 85° to 95°, and the ratio of the tooth tip width of the first tooth (11) to the second tooth (12) is 1:1.

2.

5. The helical angle end face tooth structure according to claim 1, characterized in that: Used for connecting the drive half-shaft housing of automobiles.

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