Intermediate shaft protection mechanism
By using the interference fit between the shaft and the riveting fork and the design of the rolling deformation section, the problem of welding defects in the intermediate shaft was solved, achieving a highly reliable and stable assembly connection, reducing process complexity and cost, and improving the mechanical properties of the intermediate shaft.
Patent Information
- Application Number
- CN202521096520.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-30
- Publication Date
- 2025-12-30
- Estimated Expiration
- 2035-05-30
AI Technical Summary
The existing intermediate shaft welding structure has welding defects such as porosity, slag inclusion, incomplete penetration, lack of fusion, cracks, pits, undercut, and weld beads, resulting in inconsistent product quality and poor reliability, and making welding process control difficult.
The shaft and riveting fork are connected by an interference fit. The design of the stepped circle and ball hole, combined with the rolling deformation part and countersunk hole structure, replaces the traditional welding to achieve the assembly connection.
It avoids welding defects, improves the reliability of the intermediate shaft and the consistency of finished products, reduces process complexity and manufacturing costs, and improves assembly efficiency and mechanical properties.
Smart Images
Figure CN223739904U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the technical field of automobile steering system spare parts, and particularly relates to an intermediate shaft protection mechanism. BACKGROUND
[0002] The intermediate shaft is an important spare part of the automobile steering system and is mainly used for transmitting torque. The intermediate shaft is mostly of a welded structure, and the transmission shaft and the yoke are fused into one body by welding. The weld of the intermediate shaft has welding defects such as blowhole, slag inclusion, incomplete penetration, incomplete fusion, crack, crater, undercut and welding tumor. The early-stage cleaning of the surface of the welded spare part, the process control of the welding process parameters and the batch control of the finished product quality are difficult. CONTENT OF THE UTILITY MODEL
[0003] The utility model is just in view of the above problems, provide a kind of high reliability, there is no welding defect assembly type intermediate shaft protection mechanism.
[0004] In order to realize the above-mentioned purpose of the utility model, the utility model adopts the following technical scheme, the utility model discloses a shaft body and rivet press fork, the rivet press fork is U-shaped, and it is characterized in that: the end of the shaft body is provided with a stepped circle, the surface of the stepped circle is provided with a ball channel structure, and the diameter of the stepped circle is smaller than the diameter of the shaft body;The middle part of the rivet press fork is provided with a ball channel hole matched with the stepped circle, and the shaft body is connected integrally by the stepped circle and the ball channel hole.
[0005] As a preferred scheme of the utility model, the stepped circle and the ball channel hole are interference fit.
[0006] As another preferred scheme of the utility model, the stepped circle is provided with a supporting table at the connecting position with the shaft body, the rivet press fork is provided with a boss corresponding to the supporting table, and the supporting table is attached to the boss.
[0007] As a third preferred scheme of the utility model, the end of the stepped circle is provided with a rolling deformation part for preventing the stepped circle of the shaft body from being pulled out of the ball channel hole of the rivet press fork.
[0008] Further, the end of the stepped circle is provided with a blind hole.
[0009] Further, the rivet press fork is provided with a counterbore corresponding to the rolling deformation part.
[0010] The utility model has the advantages of simple structure, convenient assembly, interference fit between the shaft body and the rivet press fork, replacement of the traditional welding process by the structure of the rolling deformation part and the rivet press fork clamping, compact structure design, clear and simple assembly process, and high assembly efficiency.
[0011] 2. Avoid welding defects, improve reliability: the traditional welding intermediate shaft common gas hole, slag, incomplete fusion and other problems in the utility model are completely avoided, the consistency and reliability of the finished product are improved, and the performance fluctuation caused by process defects is reduced.
[0012] 3. Stable assembly quality, strong process controllability: the utility model can be matched with the shaft body and riveting fork through the servo press for press fitting, can control the pressure interval, and through the radial riveting mode, the step round end part forms a rolling deformation part, is clamped and fixed with the riveting fork, realizes stable connection, the assembly process is controllable, and the dependence on the technical level of the operator is reduced.
[0013] 4. Low requirement for part surface quality, reduce manufacturing cost: the utility model does not need complex pre-welding treatment or post-welding polishing, has lower requirement for part surface quality, can reduce machining process and related process cost, and has lower overall manufacturing cost.
[0014] 5. Optimize material deformation space: the utility model is provided with a counterbore at the ball channel hole end of the riveting fork, provides sufficient material space for the rolling deformation part, effectively relieves riveting stress concentration, and avoids structural damage or deformation in the riveting process.
[0015] 4. Improve mechanical properties and durability of intermediate shaft: the press fitting is closely attached, the rolling deformation part is connected with the counterbore of the riveting fork firmly, guarantees the overall strength and stability of the utility model in the process of bearing torque, and is helpful to improve the long-term operation performance of the whole vehicle steering system. BRIEF DESCRIPTION OF DRAWINGS
[0016] Figure 1 is a structural schematic view of the utility model.
[0017] Figure 2 is Figure 1 the right view.
[0018] Figure 3 is a structural schematic view of the shaft body.
[0019] Figure 4 is Figure 3 the right view.
[0020] Figure 5 is a structural schematic view of the riveting fork.
[0021] Figure 6 is Figure 5 the right view.
[0022] In the drawings, 1 is the shaft body, 2 is the riveting fork, 3 is the ball channel structure, 4 is the blind hole, 5 is the end face, 6 is the supporting table, 7 is the step circle, 8 is the ball channel hole, 9 is the boss, and 10 is the counterbore. DETAILED DESCRIPTION
[0023] The utility model discloses a shaft body 1 and riveting fork 2, the riveting fork 2 is U-shaped, the shaft body 1 end is provided with the step circle 7, the step circle 7 surface is provided with the ball channel structure 3, and the diameter of step circle 7 is less than the diameter of shaft body 1, the middle part of riveting fork 2 is provided with the ball channel hole 8 that cooperates with step circle 7, and the shaft body 1 is connected integrally through step circle 7 and ball channel hole 8.
[0024] The step circle 7 and the ball channel hole 8 are interference fit. The interference fit mode enhances the fastening strength of the connecting piece, avoids loose connection, and improves the reliability and durability of the overall structure.
[0025] The step circle 7 is provided with a support table 6 at the connection with the shaft body 1, the riveting fork 2 is provided with a boss 9 corresponding to the support table 6, and the support table 6 is attached to the boss 9. The setting of the boss 9 ensures the close contact of the support table 6 on the shaft body 1 and the riveting fork 2, effectively disperses the load, reduces stress concentration, prolongs the service life of the connecting component, and is stable and reliable in connection.
[0026] The end of the step circle 7 is provided with a rolling deformation part to prevent the step circle 7 of the shaft body 1 from being pulled out of the ball channel hole 8 of the riveting fork 2. The rolling deformation part effectively prevents the step circle 7 from being pulled out, ensures the firmness of the connection, and increases the anti-vibration performance through deformation locking.
[0027] The end of the step circle 7 is provided with a blind hole 4. The rolling deformation part can be processed by rolling deformation through the riveting process, the blind hole 4 structure provides a stress area for rolling deformation, promotes uniform deformation, ensures stable stress at the connection part, and improves the reliability of the overall structure.
[0028] The riveting fork 2 is provided with a counterbore 10 corresponding to the rolling deformation part. The counterbore 10 provides sufficient space for the rolling deformation part, reduces the extrusion deformation of the riveting fork 2, protects the structural integrity of the riveting fork 2, and improves the assembly quality.
[0029] Embodiment: As shown in the drawings, the utility model discloses a shaft body 1, riveting fork 2. One end of the shaft body 1 is provided with a step circle 7 with a ball channel structure 3, and the end face 5 of the step circle 7 is provided with a circular blind hole 4; the riveting fork 2 is provided with a ball channel hole 8 in the middle, and the end face 5 of the ball channel hole 8 on one side of the U-shaped opening of the riveting fork 2 is provided with a circular counterbore 10.
[0030] The step circle 7 of the shaft body 1 and the ball channel hole 8 of the riveting fork 2 are interference fit, and are pressed and assembled by a private service press. The pressing process can monitor the interference fit pressure value interval while ensuring that the support table 6 of the shaft body 1 and the boss 9 of the riveting fork 2 are effectively attached.
[0031] The step circle 7 part of the shaft body 1 leaking out of the ball channel hole 8 can adopt the radial riveting mode to crush the end face 5 of the blind hole 4 of the step circle 7 to make the end face 5 force deformation, and crush the shaft body 1 and the riveting fork 2 together.
[0032] The circular counterbore 10 of the riveting fork 2 can provide sufficient material space to reduce the extrusion deformation of the riveting fork caused by the radial riveting.
[0033] It can be understood that the above specific description of the present application is only used to illustrate the present application and is not limited to the technical solutions described in the embodiments of the present application. Those skilled in the art should understand that the present application can still be modified or replaced equivalently to achieve the same technical effect. As long as it meets the use needs, it is within the protection scope of the present application.
Claims
1. An intermediate shaft protection mechanism comprising a shaft body (1) and a rivet fork (2), the rivet fork (2) being U-shaped, characterized in that: The shaft body (1) is provided with a stepped circle (7) at the end, the surface of the stepped circle (7) is provided with a ball channel structure (3), the diameter of the stepped circle (7) is smaller than the diameter of the shaft body (1); the middle part of the riveting fork (2) is provided with a ball channel hole (8) matched with the stepped circle (7), the shaft body (1) is connected integrally through the stepped circle (7) and the ball channel hole (8).
2. A propeller shaft protection mechanism according to claim 1, characterized in that: The stepped circle (7) and the ball channel hole (8) are in interference fit.
3. A mechanism for protecting a countershaft as defined in claim 1, characterized in that: The stepped circle (7) is provided with a supporting table (6) at the connecting part with the shaft body (1), the riveting fork (2) is provided with a convex table (9) corresponding to the supporting table (6), and the supporting table (6) is attached to the convex table (9).
4. A countershaft guard according to claim 1, wherein: The end of the stepped circle (7) is provided with a rolling deformation part to prevent the stepped circle (7) of the shaft body (1) from being taken out of the ball channel hole (8) of the riveting fork (2).
5. A propeller shaft protection mechanism according to claim 4, wherein: The end of the stepped circle (7) is provided with a blind hole (4).
6. A propeller shaft protection mechanism according to claim 4, wherein: The riveting fork (2) is provided with a counterbore (10) corresponding to the rolling deformation part.