Structure for reducing abrupt change section stress of shaft head
By designing the joint structure of the shaft head and the shaft sleeve on the drive axle shaft head, and using the outer conical surface and the inner conical surface to form rounded corners, the problem of stress concentration at the bearing installation position is solved, and the bearing capacity and structural stability of the shaft head are improved.
Patent Information
- Application Number
- CN202420985865.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-08
- Publication Date
- 2024-12-24
- Estimated Expiration
- 2034-05-08
AI Technical Summary
In the drive axle shaft head, there is a problem of stress concentration at the bearing installation position. The existing methods such as processing the rounded corners inward to reduce the bending cross-section, resulting in a decrease in load-bearing capacity and the stress cannot be effectively reduced when the single tire is transformed into a twin tire.
Design a structure including a shaft head and a sleeve connected to the shaft head. The outer surface of the shaft head is provided with an annular fixed end face, an outer conical surface and an outer circular surface. The annular end face of the shaft sleeve is in contact with the annular fixed end face of the shaft head. , the outer conical surface and inner conical surface are used to form a rounded corner structure to reduce the stress at the bearing installation position.
The structure is simple, convenient to process, low cost, does not change the wheel pitch and bearing installation position, effectively reduces the shaft head stress and improves load bearing capacity.
Smart Images
Figure CN222223834U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of drive axle shaft heads, and more specifically to a structure for reducing stress of sudden cross-section of the shaft head. Background Art
[0002] It is known that the drive axle shaft head in engineering machinery is generally used as the main supporting component, and the drive axle shaft head of the forklift carries 90% of the total weight of the vehicle and cargo; among them, the wheel hub must be matched with the bearing and the shaft head, and the shaft head structure is generally a multi-step form as shown in the attached Figure 4 As shown, the sudden change of the bending section is more obvious. Therefore, there is often a stress concentration problem at the root of the shaft head where the bearing is installed. Generally, a transition fillet is added to avoid stress concentration. If the bearing installation requires a smaller fillet at the root of the shaft head, which cannot prevent stress concentration as expected, an inward fillet is machined inside the shaft head to achieve the expected result.
[0003] However, in actual use, the above method has two problems: 1. Inwardly processing the fillet will reduce the local bending section of the axle head, that is, it reduces the bearing capacity of the axle head; 2. This method has its own limitations. When a single-tire drive axle is converted into a dual-tire drive axle, since the early design can meet the single-tire requirements but does not leave a large margin, when the dual-tire structure is converted due to the increase in wheelbase, this method of inwardly processing the chamfer can no longer achieve the expected reduction of stress to a reasonable range; therefore, a structure for reducing the stress of the sudden change section of the axle head is proposed as a further improvement to solve the problem of stress concentration in the sudden change section of the axle head. Utility Model Content
[0004] In order to overcome the above-mentioned defects of the prior art, an embodiment of the utility model provides a structure for reducing the stress of the sudden change cross section of the shaft head, so as to solve the problems raised in the above-mentioned background technology.
[0005] To achieve the above object, the utility model provides the following technical solution: a structure for reducing the stress of the sudden change cross section of the shaft head, the structure comprising: a shaft head and a shaft sleeve sleeved on the shaft head;
[0006] The outer surface of the shaft head is provided with an annular fixed end surface, an outer conical surface and an outer cylindrical surface, and the inner ring of the annular fixed end surface is connected to the outer cylindrical surface through the outer conical surface;
[0007] The two annular end faces of the sleeve are respectively arranged as a first annular end face and a second annular end face, the inner wall of the sleeve is provided with an inner conical surface and an inner circular surface, the inner ring of the first annular end face is connected with the inner ring of the second annular end face through the inner conical surface and the inner circular surface in sequence;
[0008] The first annular end surface is in contact with the annular fixed end surface, and the shaft head is sleeved with a bearing in contact with the shaft sleeve.
[0009] Furthermore, the outer circular surface and the inner circular surface are arranged concentrically.
[0010] Furthermore, the shaft sleeve material is set to be steel.
[0011] Furthermore, the inner diameter and outer diameter of the annular fixed end face are respectively the same as the inner diameter and outer diameter of the first annular end face, and the outer diameter of the first annular end face is the same as the outer diameter of the second annular end face.
[0012] Furthermore, the minimum diameter of the outer conical surface is equal to the diameter of the outer cylindrical surface.
[0013] Furthermore, the minimum diameter of the inner conical surface is equal to the diameter of the inner circular surface.
[0014] Technical effects and advantages of the utility model:
[0015] Compared with the prior art, by setting the shaft head and the shaft sleeve, the structure is simple, the processing and disassembly are convenient, and the cost is low; moreover, the structure is compact and does not change the wheelbase of the drive axle and the bearing installation position; the structure is stable and reliable, and can effectively reduce the stress of the bearing installation position of the shaft head and improve the bearing capacity of the shaft head. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model.
[0017] Figure 2 It is a structural schematic diagram of the shaft head of the utility model.
[0018] Figure 3 It is a structural schematic diagram of the shaft sleeve of the utility model.
[0019] Figure 4 This is a structural diagram of commonly used shaft heads.
[0020] The accompanying drawings are marked as follows:
[0021] 1. Shaft head; 11. Annular fixed end face; 12. External conical surface; 13. External cylindrical surface;
[0022] 2. Bushing; 21. First annular end face; 22. Second annular end face; 23. Inner conical surface; 24. Inner cylindrical surface; 3. Bearing. DETAILED DESCRIPTION
[0023] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.
[0024] As attached Figure 1 , Attachment Figure 2 and attached Figure 3 The structure shown is a structure for reducing the stress of the sudden change cross section of the shaft head, the structure comprising: a shaft head 1 and a shaft sleeve 2 sleeved on the shaft head 1;
[0025] The outer surface of the shaft head 1 is provided with an annular fixed end surface 11, an outer conical surface 12 and an outer cylindrical surface 13. The inner ring of the annular fixed end surface 11 is connected to the outer cylindrical surface 13 through the outer conical surface 12.
[0026] Among them, the stress of the sudden change of the cross section of the shaft head 1 at the position where the bearing 3 is installed is reduced mainly by forming a rounded structure with the outer conical surface 12 and the outer cylindrical surface 13 provided on the shaft head 1, so that the outer conical surface 12 ensures a smooth transition of the contour of the shaft head 1 at the position where the bearing 3 is installed, avoiding stress concentration caused by the sudden change of the bending section at this position, thereby reducing the stress at the shaft head bearing installation position;
[0027] The two annular end faces of the sleeve 2 are respectively set as a first annular end face 21 and a second annular end face 22. The inner wall of the sleeve 2 is provided with an inner conical surface 23 and an inner circular surface 24. The inner ring of the first annular end face 21 is connected to the inner ring of the second annular end face 22 through the inner conical surface 23 and the inner circular surface 24 in sequence.
[0028] The first annular end face 21 is in contact with the annular fixed end face 11 , and the shaft head 1 is sleeved with a bearing 3 in contact with the shaft sleeve 2 .
[0029] The inner conical surface 23 and the positioning step on the shaft sleeve 2 cooperate with the shaft head 1, and the positioning step cooperates with the shaft head 1 to achieve the unchanged installation position of the bearing 3, thereby reducing the stress of the shaft head 1 at the installation position of the bearing 3;
[0030] The first annular end surface 21 cooperates with the annular fixed end surface 11 on the shaft head 1 to achieve axial positioning to ensure that the installation position of the bearing 3 remains unchanged, and the inner conical surface 23 ensures that there is no interference with the shaft head 1;
[0031] The outer cylindrical surface 13 and the inner cylindrical surface 24 are arranged concentrically, so that the inner cylindrical surface 24 and the outer cylindrical surface 13 on the shaft head 1 are centered.
[0032] In a preferred embodiment, as shown in the attached Figure 1 , Attachment Figure 2 and attached Figure 3 As shown, the material of the sleeve 2 is steel.
[0033] Embodiment: The material of the shaft head 1 is QT450-10; the material of the shaft sleeve 2 is 45# steel;
[0034] In a preferred embodiment, as shown in the attached Figure 1 , Attachment Figure 2 and attached Figure 3As shown, the inner diameter and outer diameter of the annular fixed end face 11 are respectively the same as the inner diameter and outer diameter of the first annular end face 21 , and the outer diameter of the first annular end face 21 is the same as the outer diameter of the second annular end face 22 .
[0035] The minimum diameter of the outer conical surface 12 is equal to the diameter of the outer cylindrical surface 13 .
[0036] The minimum diameter of the inner conical surface 23 is equal to the diameter of the inner circular surface 24 .
[0037] Embodiment: The sudden change position of the shaft head 1: that is, the outer diameter of the annular fixed end surface 11 is 120mm, and the diameter of the outer cylindrical surface 13 is 100mm;
[0038] The inner circular surface 24 of the sleeve 2 has a diameter of 100 mm, and the outer diameters of the first annular end surface 21 and the second annular end surface 22 are both 120 mm;
[0039] Furthermore, the stress value of the conventional structure of the shaft head 1 is 500MPa, and after adding this structure, the stress value is reduced to 375MPa.
[0040] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.
[0041] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A structure for reducing the stress of the sudden change section of the shaft head, characterized in that: The structure comprises: a shaft head (1) and a shaft sleeve (2) sleeved on the shaft head (1); The outer surface of the shaft head (1) is provided with an annular fixed end surface (11), an outer conical surface (12) and an outer cylindrical surface (13); the inner ring of the annular fixed end surface (11) is connected to the outer cylindrical surface (13) via the outer conical surface (12); The two annular end surfaces of the shaft sleeve (2) are respectively arranged as a first annular end surface (21) and a second annular end surface (22); the inner wall of the shaft sleeve (2) is provided with an inner conical surface (23) and an inner circular surface (24); the inner ring of the first annular end surface (21) is connected to the inner ring of the second annular end surface (22) via the inner conical surface (23) and the inner circular surface (24) in sequence; The first annular end surface (21) is in contact with the annular fixed end surface (11), and the shaft head (1) is sleeved with a bearing (3) in contact with the shaft sleeve (2).
2. The structure for reducing the stress of the sudden change cross section of the shaft head according to claim 1, characterized in that: The outer circular surface (13) and the inner circular surface (24) are arranged concentrically.
3. The structure for reducing the stress of the sudden change cross section of the shaft head according to claim 1, characterized in that: The material of the shaft sleeve (2) is set to be steel.
4. The structure for reducing the stress of the sudden change cross section of the shaft head according to claim 1, characterized in that: The inner diameter and outer diameter of the annular fixed end surface (11) are respectively the same as the inner diameter and outer diameter of the first annular end surface (21), and the outer diameter of the first annular end surface (21) is the same as the outer diameter of the second annular end surface (22).
5. The structure for reducing the stress of the sudden change cross section of the shaft head according to claim 1, characterized in that: The minimum diameter of the outer conical surface (12) is equal to the diameter of the outer cylindrical surface (13).
6. The structure for reducing the stress of the sudden change cross section of the shaft head according to claim 1, characterized in that: The minimum diameter of the inner conical surface (23) is equal to the diameter of the inner circular surface (24).