A three-piece hexagonal metal joint for carbon fiber half shafts
The design of a three-section hexagonal metal joint solves the connection reliability problem of carbon fiber half shafts under high torque conditions, achieving improved torsional performance and lightweight design, meeting the needs of high-performance racing cars.
Patent Information
- Application Number
- CN202522705076.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-22
- Publication Date
- 2026-08-25
- Estimated Expiration
- 2035-12-22
AI Technical Summary
Existing carbon fiber half-shaft connection structures are prone to adhesive aging or peeling under high torque conditions. Traditional nail connections have limited torsional resistance and cannot meet the strength, process stability and reliability requirements of high-performance racing cars.
The three-section hexagonal metal joint, including the connecting end, the transition reinforcement section and the joint assembly, is designed with a one-piece molding and rivet connection. Combined with the regular hexagonal cross section and optimized rivet configuration, it achieves a reliable connection between the carbon fiber half shaft and the titanium alloy transmission end, disperses torsional stress, and enhances torsional performance and reliability.
It significantly improves torsional resistance and structural reliability, has good process controllability, is easy to maintain, and its lightweight design meets the requirements of high-performance racing cars.
Smart Images
Figure CN224675811U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to carbon fiber half axle joint technical field, especially a three -section type hexagonal metal joint for carbon fiber half axle. BACKGROUND
[0002] In FSAE event, carbon fiber half axle has become the key lightweight scheme of improving vehicle performance because of its excellent power -to -weight ratio, but the reliability of the connecting place has been the technical difficulty. At present, the mainstream connection mode is two kinds of glue joint and nail connection: although glue joint can realize higher lightweight, but the process controllability is poor, and the maintenance is difficult, and the glue layer aging or peeling off is easy to occur under high torque working condition.
[0003] Although the traditional nail connection is convenient to assemble and maintain, but adopts the two -section type metal joint of circular section, and the stress concentration is obvious under the torsional load, and the torsional performance is limited, and the torsional failure is easy to occur under high torque working condition.
[0004] The current connecting structure of carbon half axle is still difficult to completely meet the use demand of high -performance racing car in strength, process stability and reliability, so improvement is needed. UTILITY MODEL CONTENTS
[0005] The utility model relates to a three -section type hexagonal metal joint for carbon fiber half axle.
[0006] In order to realize the above -mentioned purpose, the utility model adopts the following technical scheme: A three -section type hexagonal metal joint for carbon fiber half axle, including connecting end, transition reinforcing section and joint assembly, the transition reinforcing section is arranged between connecting end and joint assembly and the both ends of transition reinforcing section are fixedly connected with connecting end and joint assembly respectively, the connecting end, transition reinforcing section and joint assembly are integrally formed; The transition reinforcing section includes hexagonal connecting section, the upper end of hexagonal connecting section is provided with first connecting hole, the bottom in first connecting hole is provided with second connecting hole, and second connecting hole is throughly arranged on hexagonal connecting section, the connecting end includes power input shaft, the inner hole is arranged in power input shaft, and the inner hole and second connecting hole are coaxially arranged, the joint assembly includes sleeve piece, and the inner hole of sleeve piece is coaxially arranged with first connecting hole; Three positioning holes are arranged at equal intervals on the sleeve piece; The joint assembly and carbon half axle are detachably connected.
[0007] Compared with the prior art, the technical scheme of the three-section positive hexagonal metal joint is adopted, reliable connection of the carbon fiber hollow half shaft and the titanium alloy transmission end is realized through the one-piece forming mode, the core of the scheme is that the three-section structure layout is cooperated with the positive hexagonal section design, the optimized nail connection is combined, the torsional resistance and the reliability of the joint are significantly improved while the light weight is ensured.
[0008] Preferably, the sleeve member is arranged through the carbon half shaft, and three rivets are arranged through the three positioning holes and extend into the sleeve member at equal intervals at the end of the carbon half shaft connected with the sleeve member.
[0009] Further, three and positioning holes are arranged on the carbon half shaft and the joint assembly in the circumferential direction, rivets with a diameter of 8 mm and a length of 12 mm are arranged through the and positioning holes and the pipe wall of the carbon fiber half shaft to form reliable mechanical locking; The outer wall and the inner wall of the carbon fiber half shaft are connected by the nail to form a multidirectional shear plane, so that the torsional force is uniformly dispersed, and the stress concentration phenomenon of the circular section is effectively avoided; the three evenly distributed rivets cooperatively bear the shear load while providing radial fixation, so that reliable adaptation to the high alternating torque working condition is realized under the premise of structural light weight.
[0010] Preferably, a plurality of notches are arranged at equal intervals at the end of the power input shaft away from the transition reinforcing section, and the notches are arranged in parallel with the axis of the power input shaft. The power input shaft is provided with a ring-shaped notch at the end away from the transition reinforcing section, and the ring-shaped notch is arranged through the plurality of notches.
[0011] Further, the connecting end is a power input spline interface, the first connecting end cooperates with the three-ball pin and the differential to complete integration, the setting of the notches can fully realize insertion and connection, ensure the abutting and insertion effect, and complete stable transmission of power.
[0012] Preferably, the diameters of the second connecting hole and the inner hole are the same, the inner diameter of the first connecting hole and the sleeve member is the same, and the second connecting hole, the inner hole, the first connecting hole and the sleeve member are coaxially arranged.
[0013] Further, it is helpful to reduce the overall weight.
[0014] Preferably, the carbon half shaft comprises a carbon half insertion pipe, the sleeve member extends into the carbon half insertion pipe, three insertion holes are arranged at equal intervals at the end of the carbon half insertion pipe connected with the sleeve member, the three insertion holes are one-to-one corresponding to the three positioning holes, and three rivets are arranged through the three insertion holes, respectively.
[0015] Further, the joint assembly is a connecting section with an outer diameter in interference fit with the inner diameter of the carbon fiber half shaft, three positioning holes 31 are uniformly arranged on the circumference of the connecting section, and three high-strength rivets with a diameter of 8 mm and a length of 12 mm can penetrate the insertion hole and the corresponding positioning hole to realize three-point uniform mechanical locking with the carbon fiber half shaft.
[0016] Preferably, the connecting end and the transition reinforcing section are smoothly connected in an arc shape.
[0017] Further, the connecting strength between the connecting end and the transition reinforcing section is ensured.
[0018] Preferably, the connecting end, the transition reinforcing section and the joint assembly are all made of titanium alloy.
[0019] Further, the metal material is used to improve the overall strength.
[0020] Preferably, the power input shaft is tapered at the end away from the transition reinforcing section.
[0021] Further, the tapering facilitates insertion and improves the efficiency of insertion during installation.
[0022] The beneficial effects of the utility model are: 1. The torsional performance is significantly improved: the multi-plane bearing characteristics of the regular hexagonal cross section effectively disperse the torsional stress and avoid the stress concentration phenomenon of the traditional circular cross section. 2. The structural reliability is enhanced: the three-section integrated structure improves the overall stiffness and fatigue life, and the composite design of interference fit and three-nail uniform connection realizes multiple force transmission guarantee. 3. The process is controllable: the mechanical connection method is simple and controllable, and the assembly process is convenient for maintenance and replacement, which overcomes the problem that the glue joint process has high requirements for environment and operation. 4. Light weight and high performance: under the premise of ensuring the connection strength, the light weight design is realized through structural optimization, which meets the requirements of FSAE racing car for high power-to-weight ratio of transmission system. BRIEF DESCRIPTION OF DRAWINGS
[0023] Figure 1 The structure of the utility model is shown in the figure; Figure 2 The utility model is shown in the sectional view; Figure 3 The position relationship structure of the transition reinforcing section and the carbon half shaft in the utility model is shown in the figure; Figure 4 The connection structure of the utility model is shown in the figure; In the figure: 1 connecting end, 11 power input shaft, 12 notch, 13 annular notch, 14 inner hole, 2 transition reinforcing section, 21 first connecting hole, 22 second connecting hole, 23 hexagonal connecting section, 3 joint assembly, 31 positioning hole, 32 sleeve piece, 4 carbon half shaft, 41 insertion hole, 42 carbon half insertion pipe, 5 rivet. DETAILED DESCRIPTION
[0024] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments.
[0025] REFERENCE Figures 1-4 A three-section hexagonal metal joint for carbon fiber half shafts, comprising a connecting end 1, a transition reinforcing section 2 and a joint assembly 3, the transition reinforcing section 2 is arranged between the connecting end 1 and the joint assembly 3, and the two ends of the transition reinforcing section 2 are fixedly connected with the connecting end 1 and the joint assembly 3 respectively, the connecting end 1 and the transition reinforcing section 2 are smoothly connected in an arc shape, so as to ensure the connecting strength between the connecting end 1 and the transition reinforcing section 2; the connecting end 1, the transition reinforcing section 2 and the joint assembly 3 are integrally formed; through the integrally formed arrangement mode, the firmness of the connection can be ensured, the connecting end 1, the transition reinforcing section 2 and the joint assembly 3 are all made of titanium alloy; the metal material is used for preparation, so as to improve the overall strength.
[0026] In the embodiment, the transition reinforcing section 2 comprises a hexagonal connecting section 23, the upper end of the hexagonal connecting section 23 is provided with a first connecting hole 21, the bottom of the first connecting hole 21 is provided with a second connecting hole 22, the second connecting hole 22 is arranged through the hexagonal connecting section 23, the connecting end 1 comprises a power input shaft 11, the inner hole 14 is arranged in the power input shaft 11, the inner hole 14 and the second connecting hole 22 are coaxially arranged, the joint assembly 3 comprises a sleeve piece 32, the inner hole of the sleeve piece 32 is coaxially arranged with the first connecting hole 21; through the arrangement of the inner hole 14, the second connecting hole 22 and the first connecting hole 21, the overall weight of the component can be sufficiently reduced, and the coaxial arrangement can ensure the stability of the structure, three positioning holes 31 are arranged at equal intervals on the sleeve piece 32; the joint assembly 3 and the carbon half shaft 4 are detachably connected, so as to be quickly connected and sufficiently ensure the firmness of the connection.
[0027] In the embodiment, the sleeve piece 32 is arranged through the carbon half shaft 4, three rivets 5 are arranged at equal intervals on the end of the carbon half shaft 4 connected with the sleeve piece 32, the three rivets 5 respectively pass through the three positioning holes 31 and extend into the sleeve piece 32; the carbon half shaft 4 and the joint assembly 3 are uniformly provided with three insertion holes 41 and positioning holes 31 along the circumference, the diameter of the rivet 5 is 8mm, and the length is 12mm; the rivet 5 passes through the insertion hole 41 and the positioning hole 31 and the wall of the carbon fiber half shaft, so as to form a reliable mechanical locking; The outer wall and the inner wall of the carbon fiber half shaft are connected by nails to form a multi-directional shear plane, so that the torsional force is uniformly dispersed, and the stress concentration phenomenon of the circular cross section is effectively avoided; the three evenly distributed rivets 5 provide radial fixation while cooperating to bear the shear load, so that reliable adaptation to the high alternating torque working condition is realized under the premise of lightweight structure.
[0028] In the embodiment, a plurality of openings 12 are arranged at equal intervals on the end of the power input shaft 11 away from the transition reinforcing section 2, and the openings 12 and the axis of the power input shaft 11 are arranged in parallel; a ring-shaped opening 13 is arranged on the end of the power input shaft 11 away from the transition reinforcing section 2, and the ring-shaped opening 13 is arranged through the plurality of openings 12; the connecting end 1 is a power input spline interface, and the first section of the connecting end 1 is matched with a three-ball pin to complete integration with a differential; through the arrangement of the openings 12, plug-in connection can be fully achieved, multi-section connection can be achieved, and the plug-in effect is ensured, so that stable power transmission is completed; the end of the power input shaft 11 away from the transition reinforcing section 2 is arranged in a tapered shape; through the tapered arrangement, plug-in connection is facilitated, and the efficiency of plug-in connection is improved during installation.
[0029] In the embodiment, the second connecting hole 22 and the inner hole 14 have the same diameter, the first connecting hole 21 and the sleeve member 32 have the same inner diameter, and the second connecting hole 22, the inner hole 14, the first connecting hole 21 and the sleeve member 32 are coaxially arranged, so that the overall weight of the components can be reduced while the overall strength is ensured.
[0030] In the embodiment, the carbon half shaft 4 comprises a carbon half plug-in pipe 42, the sleeve member 32 extends into the carbon half plug-in pipe 42, three plug-in holes 41 are arranged at equal intervals on the end of the carbon half plug-in pipe 42 connected with the sleeve member 32, the three plug-in holes 41 correspond to the three positioning holes 31 one by one respectively, and the three rivets 5 are arranged through the three plug-in holes 41 respectively; the joint assembly 3 is a connecting section in an interference fit with the inner diameter of the carbon fiber half shaft, three positioning holes 31 are arranged on the joint assembly 3 in a circumferential direction, and the three rivets 5 with a diameter of 8 mm and a length of 12 mm can be arranged through the plug-in holes 41 and the corresponding positioning holes 31 to realize three-point uniform mechanical locking with the carbon fiber half shaft.
[0031] In the embodiment, the connecting end 1, the transition reinforcing section 2 and the joint assembly 3 are integrated metal pieces, which are composed of three sections connected in sequence: the connecting end 1 is a standard spline matched with a three-ball pin, is connected with a differential to realize power input; the transition reinforcing section 2 is a transition reinforcing section, and the shape thereof is smoothly transitioned from a circular shape of the connecting end 1 to a hexagonal shape; the inscribed circle diameter thereof is accurately matched with the outer diameter of the half shaft, which is 30 mm; the transition reinforcing section 2 plays a role in structural reinforcement and stress transmission optimization; the joint assembly 3 is a connecting section with the carbon fiber half shaft, and the outer diameter of the joint assembly 3 is designed to form an interference fit with the inner diameter of the carbon fiber half shaft. Meanwhile, three positioning holes 31 are arranged on the joint assembly 3 in a circumferential direction, and a rivet 5 with a diameter of 8 mm and a length of 12 mm is used to penetrate the hole and the pipe wall of the carbon half shaft to form a reliable mechanical locking.
[0032] When the torque is transmitted, the outer wall of the joint assembly 3 and the inner wall of the carbon half shaft 4 are connected by the rivet 5 to form a multi-directional shear plane, so that the torsional force is uniformly dispersed, and the stress concentration phenomenon of the circular cross section is effectively avoided; the three-section design further reduces the peak stress at the connection by increasing the torsional arm length and optimizing the cross section transition; the three evenly distributed rivets 5 provide radial fixation while cooperatively bearing the shear load, and under the premise of structural lightweight, reliable adaptation to high alternating torque conditions is achieved.
[0033] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can make equivalent replacements or changes to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, and all of them should be covered within the protection scope of the present application.
Claims
1. A three-section hexagonal metal joint for carbon fiber half-shafts, comprising a connecting end (1), a transition reinforcing section (2), and a joint assembly (3), characterized in that: The transition reinforcement section (2) is disposed between the connecting end (1) and the connector assembly (3), and the two ends of the transition reinforcement section (2) are fixedly connected to the connecting end (1) and the connector assembly (3) respectively. The connecting end (1), the transition reinforcement section (2) and the connector assembly (3) are integrally formed. The transition reinforcement section (2) includes a hexagonal connecting section (23), the upper end of which is provided with a first connecting hole (21), and the bottom of the first connecting hole (21) is provided with a second connecting hole (22), which is provided through the hexagonal connecting section (23). The connecting end (1) includes a power input shaft (11), the power input shaft (11) is provided with an inner hole (14), the inner hole (14) and the second connecting hole (22) are coaxially arranged. The connector assembly (3) includes a sleeve (32), the inner hole of which is coaxially arranged with the first connecting hole (21). The sleeve (32) is provided with three positioning holes (31) at equal intervals around its circumference. The connector assembly (3) and the carbon half-shaft (4) are detachably connected.
2. The three-section hexagonal metal joint for carbon fiber half-shafts according to claim 1, characterized in that: The sleeve (32) is installed inside the carbon half shaft (4). Three rivets (5) are installed at equal intervals at one end of the carbon half shaft (4) that is connected to the sleeve (32). The three rivets (5) are installed through three positioning holes (31) and extend into the sleeve (32).
3. A three-section hexagonal metal joint for carbon fiber half-shafts according to claim 1, characterized in that: The power input shaft (11) has multiple notches (12) at equal intervals at one end away from the transition reinforcement section (2), and the notches (12) and the axis of the power input shaft (11) are arranged parallel to each other. The power input shaft (11) has an annular notch (13) at one end away from the transition reinforcement section (2), and the annular notch (13) is provided through multiple notches (12).
4. A three-section hexagonal metal joint for carbon fiber half-shafts according to claim 1, characterized in that: The second connecting hole (22) and the inner hole (14) have the same diameter, the first connecting hole (21) and the inner diameter of the sleeve (32) have the same diameter, and the second connecting hole (22), the inner hole (14), the first connecting hole (21) and the sleeve (32) are coaxially arranged.
5. A three-section hexagonal metal joint for carbon fiber half-shafts according to claim 2, characterized in that: The carbon half shaft (4) includes a carbon half insertion tube (42), and the sleeve (32) extends into the carbon half insertion tube (42). The end of the carbon half insertion tube (42) connected to the sleeve (32) is provided with three insertion holes (41) at equal intervals. The three insertion holes (41) correspond one-to-one with the three positioning holes (31). Three rivets (5) are respectively installed through the three insertion holes (41).
6. A three-section hexagonal metal joint for carbon fiber half-shafts according to claim 1, characterized in that: The connecting end (1) and the transition reinforcement section (2) form a smooth arc transition.
7. A three-section hexagonal metal joint for carbon fiber half-shafts according to claim 1, characterized in that: The connecting end (1), the transition reinforcement section (2), and the joint assembly (3) are all made of titanium alloy.
8. A three-section hexagonal metal joint for carbon fiber half-shafts according to claim 3, characterized in that: The end of the power input shaft (11) away from the transition reinforcement section (2) is tapered.