A knurled tooth limited sleeve fastener
By designing knurled teeth limit sleeve fasteners, the axial limit of knurled teeth and flange and the radial anti-rotating of the circumcision groove and limit shaft shoulder surfaces are solved, and the overall structural stiffness and performance of the frame are significantly improved.
Patent Information
- Application Number
- CN202421546063.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-02
- Publication Date
- 2025-04-01
- Estimated Expiration
- 2034-07-02
AI Technical Summary
The connection points of thin-wall aluminum alloy frames have problems such as insufficient strength, low stiffness and material corrosion during use, which is difficult to meet the needs of new energy vehicle design.
A knurled tooth limiting sleeve fastener is designed, and the first knurled tooth contacts the flange at the upper part of the thin-walled frame to form an axial limit, and combines the circumcision groove and the limiting shaft shoulder surface to contact at the lower part to form a radial anti-rotation, which enhances the overall structural stiffness of the frame.
This fastener can effectively improve the use stiffness of the thin-walled frame, enhance the axial locking force and side slip resistance, and avoid extrusion deformation caused by insufficient connection point strength during use of the frame.
Smart Images
Figure CN222702305U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of fasteners, and in particular relates to a knurled tooth limiting sleeve fastener for a thin-wall frame. Background Art
[0002] In the current family car market, new energy vehicles continue to squeeze out the share of traditional fuel vehicles, and the market share of new energy vehicles has exceeded 50%. With the rise and breakthrough of national car companies, the design technology of new energy vehicles has been continuously updated and iterated, and many new problems have encountered unprecedented challenges and tests. The overall direction of vehicle design is to move forward in the direction of component integration and lightweight under the premise of safety and reliability, and the application of hollow and lightweight thin-walled aluminum alloy skeletons (or frames) has increased generation by generation. Therefore, it is worth reflecting on whether the connection points set on the skeleton are suitable according to the traditional method. Usually, the schemes for setting connection points on one side of sheet metal (or skeleton panel) are: panel opening plus welding nuts, top arc welding bolts, panel opening plus rivet bolts, and double-sided opening through bolt nut connection. Since the frame structure is made of aluminum alloy, it is impossible to weld the cold forging of heterogeneous steel nuts, and the aluminum alloy welding seams have the problem of low stripping force and stripping torque in the connection point strength; the use of rivet bolts has the problem of electrochemical reaction caused by the potential difference between the steel and aluminum heterogeneous materials, which makes the steel fasteners easy to corrode; in addition to these problems of the single-panel connection point, the strength and rigidity of the connection are very weak, which is difficult to meet the requirements of the use conditions; the double-sided through-hole through-bolt nut connection is hollow and has no support function in the thin-walled frame. When tightening the bolts or nuts, the crushing deformation of the support surface cannot provide the normal connection preload axial force. For this reason, the connection points of thin-walled aluminum alloy frames cannot use traditional connection fasteners and need to have a structurally innovative connection design. Summary of the invention
[0003] The technical problem to be solved by the utility model is to provide a knurled tooth limiting sleeve fastener which can support the inner surface of a thin-walled frame, improve its service rigidity, and has good axial limiting and radial anti-rotation effects.
[0004] In order to solve the above technical problems, the present invention is achieved through the following technical solutions: a knurled tooth limited sleeve fastener, comprising a sleeve body, a flange is integrally formed on the top of the sleeve body, a first knurled tooth is arranged in an annular array on the top of the sleeve body, the distance dimension between the top end face of the first knurled tooth and the flange is the same as the thickness dimension of the thin-walled frame, a second sleeve is coaxially arranged at the lower end of the sleeve body, a limiting shoulder surface is formed between the lower end face of the sleeve body and the second sleeve, an annular groove is arranged on the second sleeve, the upper part of the annular groove extends to the limiting shoulder surface of the sleeve body, the sleeve body and the second sleeve are coaxially provided with interconnected through holes, and the height dimension of the second sleeve is smaller than the thickness dimension of the thin-walled frame by 0.2-1mm.
[0005] Preferably, the width of the annular groove is 1 / 3-1 / 2 of the width of the second sleeve.
[0006] Preferably, the through hole is provided with a first bevel structure and a second bevel structure at the upper and lower ends thereof, respectively.
[0007] Preferably, the height dimension of the vertex of a single first knurling tooth from the outer surface of the sleeve body is set to 0.2-0.8 mm.
[0008] Preferably, the second sleeve is configured as a frustum-shaped structure which is larger at the bottom and smaller at the top.
[0009] Preferably, the frustum-shaped structure of the second sleeve is provided with vertically penetrating grooves in a linear array.
[0010] Compared with the prior art, the utility model has the following advantages: the sleeve fastener contacts the upper part of the thin-walled frame through the first knurled teeth and the flange to form an axial limiting effect, and at the same time, the sleeve body and the upper mounting hole of the thin-walled frame are matched with an interference fit of 0.05mm-0.30mm, which serves to limit the rotation of the sleeve fastener and the upper mounting hole of the thin-walled frame, and the material of the lower part of the thin-walled frame is squeezed into the annular groove, and the annular groove and the limiting shoulder surface contact the lower part of the thin-walled frame to form an axial limiting effect, and the material of the lower part of the thin-walled frame is squeezed into the annular groove, and the material of the lower part of the thin-walled frame is squeezed into the groove, which serves to limit the rotation of the sleeve fastener and the lower mounting hole of the thin-walled frame, and at the same time, the sleeve fastener can support and strengthen the thin-walled frame, thereby increasing the overall structural stiffness of the thin-walled frame during use.
[0011] The sleeve fastener is installed in conjunction with the thin-walled frame, which can ensure good rigidity at the connection between the upper and lower mounting holes of the thin-walled frame, and also has the advantage that the thin-walled frame will not be squeezed and deformed after being locked by the fastener. The sleeve fastener can provide axial locking force and greater sideslip resistance. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] The utility model is further described below in conjunction with the accompanying drawings.
[0013] Figure 1 It is a stereogram of the utility model.
[0014] Figure 2 It is the front view of the utility model.
[0015] Figure 3 It is a front view of the installation structure of the utility model and the thin-wall frame.
[0016] Figure 4 yes Figure 3 AA section view.
[0017] Figure 5 It is a schematic diagram of an upper assembly tool, a lower assembly tool and the utility model being used together but not yet pressed together.
[0018] Figure 6 It is a schematic diagram of the upper assembly tool, the lower assembly tool and the utility model being used together to complete the press assembly. DETAILED DESCRIPTION
[0019] The utility model is described in detail below in conjunction with specific implementation methods:
[0020] like Figures 1 to 6 A knurled tooth limiting sleeve fastener is shown, comprising a sleeve body 1, a flange 2 is integrally formed on the top of the sleeve body 1, a first knurled tooth 5 is arranged in a ring array on the top of the sleeve body 1, the distance dimension between the top end face of the first knurled tooth 5 and the flange 2 is the same as the thickness dimension of the thin-walled frame 8, a second sleeve 7 is coaxially arranged at the lower end of the sleeve body 1, a limiting shoulder surface 4 is formed between the lower end face of the sleeve body 1 and the second sleeve 7, an annular groove 6 is arranged on the second sleeve 7, the upper part of the annular groove 6 extends to the limiting shoulder surface 4 of the sleeve body 1, which has the advantage of being easy to process and form, the sleeve body 1 and the second sleeve 7 are coaxially provided with a through hole 3 that intersects with each other, and the height dimension of the second sleeve 7 is 0.2-1mm smaller than the thickness dimension of the thin-walled frame 8.
[0021] The width of the annular groove 6 is 1 / 3-1 / 2 of the width of the second sleeve 7, which can ensure that the metal material of the thin-walled frame 8 is squeezed and deformed to flow into the annular groove 6 to form a fixed limit, and at the same time ensure the structural strength of the second sleeve 7. In order to facilitate the guide shafts of the upper and lower assembly tools to be embedded and installed in the through hole 3, the first bevel structure 31 and the second bevel structure 32 can guide the guide shafts of the upper assembly tool 10 and the lower assembly tool 11.
[0022] The through hole 3 is provided with a first bevel structure 31 and a second bevel structure 32 at the upper and lower ends respectively, so that the guide shafts of the upper and lower assembly tools can be embedded and installed in the through hole 3. The first bevel structure 31 and the second bevel structure 32 can guide the guide shafts of the upper and lower assembly tools.
[0023] As the preferred setting size of the first knurled tooth 5, the height dimension of the vertex of a single first knurled tooth 5 from the outer surface of the sleeve body 1 is set to 0.5 mm. After the first knurled tooth 5 passes through the upper mounting hole of the thin-walled frame 8, the upper mounting hole of the thin-walled frame 8 is squeezed and deformed into a deformation structure corresponding to the first knurled tooth 5.
[0024] The material hardness of the thin-walled frame 8 is less than that of the sleeve fastener. After the thin-walled frame 8 is squeezed, its material will deform and flow into the annular groove 6. The second sleeve 7 is configured as a frustum-shaped structure with a larger bottom and a smaller top. The frustum-shaped structure facilitates the thin-walled frame 8 to flow into the annular groove 6 for limiting position after being squeezed.
[0025] The second sleeve 7 has a frustum-shaped structure with grooves 9 extending vertically in a linear array. When the thin-walled frame 8 is squeezed, its material will deform and flow into the grooves 9, thereby preventing the sleeve fastener and the thin-walled frame 8 from rotating.
[0026] The outer diameters of the sleeve body 1 and the second sleeve 7 match the apertures of the upper and lower mounting holes of the thin-walled frame 8. First, the guide shaft of the upper assembly tool 10 is slidably embedded in the upper part of the through hole 3 to push the sleeve fastener to slide and embed in the upper mounting hole of the thin-walled frame 8. After the first knurled teeth 5 on the top of the sleeve body 1 pass through the mounting hole on the upper part of the thin-walled frame 8, the first knurled teeth 5 squeeze and deform the inner wall of the mounting hole on the upper part of the thin-walled frame 8 into a corresponding indentation groove structure. The second sleeve 7 at the lower part of the sleeve fastener is placed in the mounting hole at the lower part of the thin-walled frame 8. After the sleeve body 1 is rotated so that the first knurled teeth 5 and the indentation groove structure squeezed and deformed by the upper mounting hole are in a non-longitudinal alignment position, the upper part of the thin-walled frame 8 can be clamped by cooperating with the first knurled teeth 5 and the flange 2 to tighten the upper part of the thin-walled frame 8. An axial limiting effect is formed, and at the same time, the sleeve body 1 and the upper mounting hole of the thin-walled frame 8 are matched with an interference fit of 0.05mm-0.30mm, which serves the purpose of limiting the anti-rotation of the sleeve fastener and the upper mounting hole of the thin-walled frame 8. At this time, the limiting shoulder surface 4 at the bottom end of the sleeve body 1 contacts and limits the thin-walled frame 8, and is slidably embedded in the lower part of the through hole 3 through the guide shaft of the lower assembly tool 11. Under the extrusion action of the upper assembly tool 10 and the lower assembly tool 11, the lower material of the thin-walled frame 8 is squeezed into the annular groove 6, and the annular groove 6 and the limiting shoulder surface 4 cooperate to clamp the lower part of the thin-walled frame 8, forming an axial limiting effect on the lower part of the thin-walled frame 8, and the lower material of the thin-walled frame 8 is squeezed into the groove 9, which serves the purpose of limiting the anti-rotation of the sleeve fastener and the lower mounting hole of the thin-walled frame 8. The guide shaft of the lower assembly tool 11 is set as a frustum-shaped structure with a small bottom and a large top. After the limiting end surface of the lower assembly tool 11 contacts the lower end of the thin-walled frame 8, the lower part of the guide shaft can squeeze the second sleeve 7 outward, thereby achieving a better limiting effect. The bolt slides through the matching component and the through hole 3 on the thin-walled frame 8, and the lower end of the bolt is locked and fixed by a lock nut.
Claims
1. A knurled tooth limited sleeve fastener, characterized in that: The invention comprises a sleeve body (1), wherein the top of the sleeve body (1) is integrally formed with a flange (2), the top of the sleeve body (1) is provided with first knurled teeth (5) in an annular array, the distance between the top end surface of the first knurled teeth (5) and the flange (2) is the same as the thickness of a thin-walled frame (8), a second sleeve (7) is coaxially arranged at the lower end of the sleeve body (1), a limiting shoulder surface (4) is formed between the lower end surface of the sleeve body (1) and the second sleeve (7), an annular groove (6) is arranged on the second sleeve (7), the upper part of the annular groove (6) extends to the limiting shoulder surface (4) of the sleeve body (1), the sleeve body (1) and the second sleeve (7) are coaxially provided with intersecting through holes (3), and the height of the second sleeve (7) is 0.2-1 mm smaller than the thickness of the thin-walled frame (8).
2. The knurled tooth limited sleeve fastener according to claim 1, characterized in that: The width of the annular groove (6) is 1 / 3 to 1 / 2 of the width of the second sleeve (7).
3. The knurled tooth limited sleeve fastener according to claim 1, characterized in that: The through hole (3) is provided with a first oblique angle structure (31) and a second oblique angle structure (32) at the upper and lower ends respectively.
4. The knurled tooth limited sleeve fastener according to claim 1, characterized in that: The height dimension of the vertex of a single first knurled tooth (5) from the outer surface of the sleeve body (1) is set to be 0.2-0.8 mm.
5. The knurled tooth limited sleeve fastener according to claim 1, characterized in that: The second sleeve (7) is configured as a frustum-shaped structure that is larger at the bottom and smaller at the top.
6. The knurled tooth limited sleeve fastener according to claim 5, characterized in that: The second sleeve (7) has a frustum-shaped structure provided with grooves (9) extending vertically in a linear array.