Connecting device and vehicle

Abstract

The utility model belongs to the technical field of connecting parts, and particularly relates to a connecting device and a vehicle, the connecting device comprises a fastener, a first sleeve connected with a first piece to be connected and a second sleeve connected with a second piece to be connected; a first through hole is formed in the first sleeve, a threaded hole is formed in the second sleeve, and the threaded hole is communicated with a mounting hole in a second to-be-connected piece; the fastener comprises an end part and a threaded column connected with the end part; the end of the threaded column abuts against the end, away from the second to-be-connected piece, of the first sleeve, and the threaded column sequentially penetrates through the first through hole and the mounting hole and then is in threaded connection with the threaded hole. According to the utility model, the second connecting piece is pressed between the first sleeve and the second sleeve, the first sleeve can be pressed on the second connecting piece by the fastener, and the fastener is in threaded connection with the second sleeve, so that the connection tightness between the first sleeve and the second to-be-connected piece is ensured; therefore, the first sleeve and the second to-be-connected piece are not easy to loosen.

Description

Technical Field

[0001] The utility model belongs to the technical field of connecting components, in particular to a connecting device and a vehicle. Background Art

[0002] During vehicle crash tests, the subframe is typically bolted to the chassis. With increasing demands for vehicle safety, collisions occur at high speeds and with high forces. However, existing bolts have poor shear resistance, making them prone to loosening during collisions. Consequently, existing bolts fail to meet these requirements. Utility Model Content

[0003] The utility model aims to solve the technical problem in the prior art that bolts are prone to loosening during a vehicle collision test, and proposes a connecting device and a vehicle.

[0004] To solve the above problems, the first embodiment of the present invention provides a connecting device, comprising a fastener, a first sleeve connected to a first member to be connected, and a second sleeve connected to a second member to be connected; the first sleeve is provided with a first through hole, the second sleeve is provided with a threaded hole, the threaded hole communicating with a mounting hole on the second member to be connected;

[0005] The fastener includes an end and a threaded column connected to the end; the end abuts against an end of the first sleeve away from the second to-be-connected member, and the threaded column sequentially passes through the first through hole and the mounting hole and is threadedly connected to the threaded hole.

[0006] Optionally, a first protruding tooth is provided on the end surface of the first sleeve away from the end portion, and the first sleeve abuts against the second member to be connected via the first protruding tooth.

[0007] Optionally, the connecting device further comprises a gasket sleeved on the threaded column; the gasket is installed between the end portion and the second sleeve, a second protruding tooth is provided on the end surface of the gasket facing away from the end portion, and the gasket abuts against the first sleeve via the second protruding tooth.

[0008] Optionally, the first sleeve includes a first straight cylindrical portion and a first flange portion connected to the first straight cylindrical portion, the first through hole passes through the first straight cylindrical portion and the first flange portion, and the outer diameter of the first straight cylindrical portion is smaller than the outer diameter of the first flange portion;

[0009] The end portion abuts against an end of the first straight tube portion away from the first flange portion.

[0010] Optionally, an annular ridge is provided on one end of the second sleeve facing the second member to be connected, the annular ridge is arranged around the threaded hole, and the second sleeve is welded to the second member to be connected via the annular ridge.

[0011] Optionally, the second sleeve includes a second straight cylindrical portion and a second flange portion connected to the second straight cylindrical portion, and the outer diameter of the second straight cylindrical portion is smaller than the outer diameter of the second flange portion;

[0012] The threaded hole is provided on the second straight cylindrical portion, and the annular convex edge is provided on the end surface of the second flange portion facing away from the second straight cylindrical portion.

[0013] Optionally, the second sleeve is further provided with a second through hole communicating with the threaded hole, and the second through hole is coaxially arranged with the threaded hole;

[0014] One end of the threaded column away from the end portion passes through the first through hole, the mounting hole and the second through hole in sequence and is threadedly connected to the threaded hole.

[0015] Optionally, the length of the threaded hole is greater than 2 / 3 of the length of the second through hole.

[0016] Optionally, a guide portion is provided at one end of the threaded column away from the end portion.

[0017] Another embodiment of the present invention further provides a vehicle, comprising a vehicle frame, a chassis, and the above-mentioned connecting device, wherein the first sleeve is connected to the vehicle frame, and the second sleeve is connected to the chassis.

[0018] In the utility model, the first sleeve is connected to the first part to be connected, the second sleeve is connected to the second part to be connected, and the threaded hole on the second sleeve is connected to the mounting hole on the second part to be connected, the end of the fastener is abutted against the end of the first sleeve away from the second part to be connected, and the threaded column of the fastener passes through the first through hole and the mounting hole in sequence and is threadedly connected to the threaded hole; the second connecting part is pressed between the first sleeve and the second sleeve, and the fastener can press the first sleeve onto the second connecting part, and the fastener is threadedly connected to the second sleeve, so that the fixed connection between the first sleeve and the second sleeve can be achieved by the fastener, and the tightness of the connection between the first sleeve and the second part to be connected is guaranteed, so that the first sleeve and the second part to be connected are not prone to loosening, thereby improving the tightness and stability of the connection device connecting the first part to be connected and the second part to be connected. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] Figure 1A cross-sectional view of a connecting device provided in one embodiment of the present utility model;

[0021] Figure 2 A cross-sectional view of a first sleeve of a connecting device provided in one embodiment of the present utility model;

[0022] Figure 3 A cross-sectional view of a second sleeve of a connecting device provided in one embodiment of the present utility model;

[0023] Figure 4 An indication diagram of a gasket of a connecting device provided in one embodiment of the present utility model;

[0024] Figure 5 yes Figure 4 Cross-sectional view along the AA axis.

[0025] The reference numerals in the specification are as follows:

[0026] 1. Fastener; 11. End; 12. Threaded column; 121. Guide portion; 2. First sleeve; 21. First through hole; 22. First straight tube portion; 23. First flange portion; 3. Second sleeve; 31. Threaded hole; 32. Annular ridge; 33. Second straight tube portion; 34. Second flange portion; 35. Second through hole; 4. Gasket; 41. Second protruding tooth; 5. First part to be connected; 6. Second part to be connected; 61. Mounting hole. DETAILED DESCRIPTION

[0027] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0028] It should be understood that the terms "upper", "lower", "left", "right", "front", "back", "middle", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the utility model.

[0029] like Figures 1 to 3As shown, a connecting device provided by the first embodiment of the present invention includes a fastener 1, a first sleeve 2 connected to a first part to be connected 5, and a second sleeve 3 connected to a second part to be connected 6; a first through hole 21 is provided on the first sleeve 2, and a threaded hole 31 is provided on the second sleeve 3, and the threaded hole 31 is connected to the mounting hole 61 on the second part to be connected 6; it can be understood that the fastener 1 includes but is not limited to bolts, etc., and the first part to be connected 5 can be installed on the second part to be connected 6 through the connecting device.

[0030] The fastener 1 includes an end 11 and a threaded column 12 connected to the end 11; the end 11 abuts against the end of the first sleeve 2 away from the second part to be connected 6, and the threaded column 12 passes through the first through hole 21 and the mounting hole 61 in sequence and is threadedly connected to the threaded hole 31; it can be understood that the end 11 cannot pass through the first through hole 21, the inner diameter of the first through hole 21 is larger than the outer diameter of the threaded column 12, the first sleeve 2 and the second sleeve 3 are respectively installed at the opposite ends of the second part to be connected 6, and the first through hole 21 is connected to the threaded hole 31 through the mounting hole 61.

[0031] The first and second connecting members 5 to 6 are connected by a threaded hole 31, and the second and second connecting members 6 to 6 are connected by a threaded hole 31. The first and second connecting members 5 to 6 are connected by a threaded hole 31, and the second and second connecting members 6 to 6 are connected by a threaded hole 31.

[0032] In one embodiment, if Figures 1 to 3As shown, a first convex tooth (not shown in the figure) is provided on the end face of the first sleeve 2 away from the end portion 11, and the first sleeve 2 abuts against the second part to be connected 6 through the first convex tooth. It can be understood that the first convex tooth is a plurality of first protrusions distributed at annular intervals. In this embodiment, the fastener 1 can achieve a fixed connection between the first sleeve 2 and the second sleeve 3, and the first convex tooth on the first sleeve 2 is pressed against the second part to be connected 6. The design of the first convex tooth increases the friction and torsional preload between the first sleeve 2 and the second part to be connected 6, making it less likely for the first sleeve 2 and the second part to be connected 6 to become loose, thereby improving the tightness and stability of the connection device connecting the first part to be connected 5 and the second part to be connected 6.

[0033] In one embodiment, if Figure 1 、 Figure 4 as well as Figure 5 As shown, the connection device further includes a washer 4 sleeved on the threaded column 12; the washer 4 is installed between the end 11 and the second sleeve 3. The end surface of the washer 4 facing away from the end 11 is provided with second protruding teeth 41. The washer 4 abuts against the first sleeve 2 via the second protruding teeth 41. It can be understood that the second protruding teeth 41 are a plurality of second protrusions distributed in an annular manner.

[0034] In this embodiment, the gasket 4 is pressed between the end 11 and the first sleeve 2, and the second protruding teeth 41 on the gasket 4 are pressed against the first sleeve 2. The design of the second protruding teeth 41 increases the friction and torsional preload between the gasket 4 and the first sleeve 2, making it less likely for the gasket 4 and the first sleeve 2 to loosen, further improving the tightness and stability of the connecting device in connecting the first part to be connected 5 and the second part to be connected 6.

[0035] To further illustrate, the gasket 4 can be pre-sleeved on the threaded column 12. During the process of connecting the fastener 1 with the first sleeve 2 and the second sleeve 3, the gasket 4 can be pressed between the end 11 and the first sleeve 2, thereby reducing the workload during the assembly of the first part to be connected 5, the second part to be connected 6 and the connecting device, and improving the assembly efficiency.

[0036] In one embodiment, if Figure 1 and Figure 2 As shown, the first sleeve 2 includes a first straight cylindrical portion 22 and a first flange portion 23 connected to the first straight cylindrical portion 22, the first through hole 21 passes through the first straight cylindrical portion 22 and the first flange portion 23, and the outer diameter of the first straight cylindrical portion 22 is smaller than the outer diameter of the first flange portion 23; it can be understood that the first straight cylindrical portion 22 and the first flange portion 23 are an integrally formed part.

[0037] The end portion 11 abuts against an end of the first straight cylindrical portion 22 away from the first flange portion 23, and the first protruding teeth are provided on the end surface of the first flange portion 23 facing away from the first straight cylindrical portion 22. In this embodiment, the first flange portion 23 provides a larger accommodating area for the first protruding teeth, thereby having a larger cross-sectional area, further increasing the friction and torsional preload between the first sleeve 2 and the gasket 4.

[0038] In one embodiment, if Figure 1 and Figure 3 As shown, an annular ridge 32 is provided at one end of the second sleeve 3 facing the second part to be connected 6. The annular ridge 32 is arranged around the threaded hole 31, and the second sleeve 3 is welded to the second part to be connected 6 via the annular ridge 32. It can be understood that the annular ridge 32 protrudes toward the second part to be connected 6, and projection welding is used between the second sleeve 3 and the second part to be connected 6, eliminating the need for arc welding. The design of the annular ridge 32 can effectively eliminate the contact resistance generated during arc welding, which would seriously affect the stability of the connection between the second sleeve 3 and the second part to be connected 6. During the welding process, the annular ridge 32 is compressed and increased in an orderly manner, but is always in a pressure-maintaining state. Through experiments, it has been verified that the flatness of the mounting surface where the second part to be connected 6 and the second sleeve 3 contact is significantly improved by projection welding using the annular ridge 32. The weld strength is high, the quality is stable and reliable, the cost is low, and the false torque generated by arc welding is avoided, effectively improving the axial clamping force and lateral shear force of the fastener 1.

[0039] In one embodiment, if Figure 1 and Figure 3 As shown, the second sleeve 3 includes a second straight cylindrical portion 33 and a second flange portion 34 connected to the second straight cylindrical portion 33. The outer diameter of the second straight cylindrical portion 33 is smaller than the outer diameter of the second flange portion 34. It can be understood that the second straight cylindrical portion 33 and the second flange portion 34 are an integrally formed part.

[0040] The threaded hole 31 is provided on the second straight cylindrical portion 33, and the annular ridge 32 is provided on the end surface of the second flange portion 34 facing away from the second straight cylindrical portion 33. In this embodiment, the second flange portion 34 provides a larger accommodating area for the second protruding teeth 41, thereby providing the second protruding teeth 41 with a larger cross-sectional area, further increasing the friction and torsional preload between the second sleeve 3 and the second member to be connected 6.

[0041] In one embodiment, if Figure 1 and Figure 3As shown, the second sleeve 3 is further provided with a second through hole 35 communicating with the threaded hole 31, and the second through hole 35 is coaxially arranged with the threaded hole 31. The end of the threaded column 12, away from the end portion 11, sequentially passes through the first through hole 21, the mounting hole 61, and the second through hole 35, and is threadedly connected to the threaded hole 31. It is understood that after the first sleeve 2 and the second sleeve 3 are installed at opposite ends of the second member to be connected 6, the first through hole 21 communicates with the second through hole 35 via the mounting hole 61, and the threaded section of the threaded column 12 is threadedly connected to the threaded hole 31. In this embodiment, the connecting device has a simple structure and low manufacturing cost.

[0042] In one embodiment, the length of the threaded hole 31 is greater than 2 / 3 of the length of the second through hole 35; that is, the length of the threaded hole 31 is greater than 2 / 5 of the total length of the second through hole 35 and the threaded hole 31; in this embodiment, the threaded hole 31 has a longer length, so that the threaded connection portion between the threaded column 12 and the threaded hole 31 is longer, ensuring the tightness of the connection between the fastener 1 and the second sleeve 3.

[0043] In one embodiment, if Figure 1 As shown, a guide portion 121 is provided at one end of the threaded column 12 away from the end portion 11. It is understandable that the guide portion 121 includes but is not limited to a guide cone, etc. The design of the guide portion 121 ensures that the threaded column 12 is smoothly inserted into the threaded hole 31.

[0044] Another embodiment of the present invention provides a vehicle comprising a frame, a chassis, and the aforementioned connecting device, wherein the first sleeve 2 is connected to the frame, and the second sleeve 3 is connected to the chassis. In this embodiment, the first component to be connected 5 is the frame, and the second component to be connected 6 is the chassis. The connecting device can achieve a secure connection between the frame and the base plate, ensuring the securement and stability of the connection between the frame and chassis.

[0045] In one embodiment, if Figure 1 As shown, the first sleeve 2 is welded to the vehicle frame, and the second sleeve 3 is welded to the chassis. It is understood that the vehicle frame and the outer wall of the first sleeve 2 are connected by welding, ensuring the tightness and stability of the first sleeve 2 connected to the vehicle frame; and the annular protrusion of the second sleeve 3 is connected to the chassis by projection welding, ensuring the tightness and stability of the second sleeve 3 connected to the chassis.

[0046] The fastener 1 is upgraded from an ordinary high-strength bolt to an ultra-high-strength bolt, and the performance level is upgraded from 10.9 to 14.9. The specific implementation process and requirements of the fastener 1 are as follows: the fastener 1 is made of high-quality alloy steel SAE4140 material (the specific chemical composition of the material is: C: 0.38-0.43%, Si: ≤0.15-0.35%, Mn: 0.75-0.95%, P: ≤0.015%, S: ≤0.010%, Cr: 0.8-1.1%, Cu: ≤0.25%, Ni: ≥0 .25%, Mo: 0.15-0.30%; grain size: ≥7; macrostructure: no shrinkage, cracks, delamination, white spots, bubbles, peeling and inclusions on the macro specimen; general looseness, central looseness and ingot segregation are all ≤2.0 level; decarburization: no ferrite decarburization is allowed; hardness: spheroidizing annealing hardness (HB) ≤180; no cracks shall appear in the cold forging test; non-metallic inclusions ≤1 level) cold heading forming, then machining the guide part 121 thereon, and then undergoing isothermal salt bath heat treatment (specific process: quenching temperature 890℃, Carbon potential 0.40, time 90 minutes, salt bath temperature 320℃, time 300 minutes), then automatically put on the toothed flat washer on the thread rolling machine and roll the thread, and finally perform non-electrolytic zinc flake coating surface treatment, which can finally meet the 14.9 grade ultra-high strength metallographic structure (metallographic structure is lower bainite, of which the screw thread column 12 has at least 90% bainite structure, and a maximum of 10% island martensite is allowed. The martensite should not appear continuously, and the diameter of the island martensite shall not exceed 80μm), performance (tensile strength: 1400-1550MPa; yield strength: 1400-1550MPa; yield strength: 1400-1550MPa) and performance (tensile strength: 1400-1550MPa; yield strength: 14.9 The test should be conducted in accordance with the following standards: strength: ≥1260Mpa; hardness: 425-475HV), hydrogen embrittlement requirements (tighten using an axial force testing machine to reach the yield point of fastener 1 and record the torque value, retighten once every 24 hours, and apply the tightening torque at the initial test. The test should last at least 48 hours. After 48 hours, there should be no visible cracks or fractures in the bolt 100) and fatigue requirements (average stress is 75% of the proof load, SN curve under average stress of 92.3KN, number of cycles >5 million times, amplitude 80-130HZ).

[0047] The specific implementation process and requirements of the gasket 4 are as follows: the gasket 4 is made of high-quality spring steel 65Mn material (the specific chemical composition of the material is: C: 0.62-0.70%, Si: ≤0.17-0.37%, Mn: 0.90-1.20%, P: ≤0.035%, S: ≤0.035%, Cr: ≤0.25%, Cu: ≤0.25%, Ni: ≤0.30%) and is stamped and then subjected to isothermal salt bath heat treatment (the specific process is: quenching temperature 890°C, carbon potential 0.67, time 60 minutes, salt bath temperature 320°C, time 60 minutes), which can finally meet the metallographic structure (metallographic structure is lower bainite) and performance (hardness: 425-475HV) of the ultra-high strength gasket 4. The surface of the gasket 4 contacting the fastener 1 is smooth and flat, and the surface contacting the first sleeve 2 is serrated; the surface between the end 11 of the fastener 1 and the upper surface of the gasket 4 is smooth and flat, and the contact surface is changed from the non-electrolytic zinc flake coating + electrophoretic paint contact surface of the original ordinary high-strength bolt to the non-electrolytic zinc flake coating + non-electrolytic zinc flake coating contact surface.

[0048] The connection device in the present application is used to connect the vehicle frame and the chassis. When the vehicle is subjected to a collision test, no stick-slip phenomenon occurs between the gasket 4 and the first conductor during the entire test process, false torque is avoided, and the consistency after tightening is very good, which effectively improves the axial clamping force and radial shear force of the fastener 1, and its collision performance is significantly improved; and the fastener 1 has sufficient strength and rigidity, and will not break during the collision test.

[0049] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A connecting device, characterized in that: The invention comprises a fastener, a first sleeve connected to a first part to be connected, and a second sleeve connected to a second part to be connected; the first sleeve is provided with a first through hole, the second sleeve is provided with a threaded hole, and the threaded hole is connected to the mounting hole of the second part to be connected; The fastener includes an end and a threaded column connected to the end; the end abuts against an end of the first sleeve away from the second to-be-connected member, and the threaded column sequentially passes through the first through hole and the mounting hole and is threadedly connected to the threaded hole.

2. The connecting device according to claim 1, characterized in that A first protruding tooth is provided on an end surface of the first sleeve away from the end portion, and the first sleeve abuts against the second member to be connected via the first protruding tooth.

3. The connecting device according to claim 1, characterized in that The connecting device also includes a gasket sleeved on the threaded column; the gasket is installed between the end and the second sleeve, and a second convex tooth is provided on the end surface of the gasket away from the end, and the gasket abuts against the first sleeve through the second convex tooth.

4. The connecting device according to claim 1, characterized in that The first sleeve includes a first straight cylindrical portion and a first flange portion connected to the first straight cylindrical portion, the first through hole passes through the first straight cylindrical portion and the first flange portion, and the outer diameter of the first straight cylindrical portion is smaller than the outer diameter of the first flange portion; The end portion abuts against an end of the first straight tube portion away from the first flange portion.

5. The connection device according to claim 1, characterized in that An annular convex edge is provided on one end of the second sleeve facing the second member to be connected. The annular convex edge is arranged around the threaded hole. The second sleeve is welded to the second member to be connected via the annular convex edge.

6. The connecting device according to claim 5, characterized in that The second sleeve includes a second straight cylindrical portion and a second flange portion connected to the second straight cylindrical portion, and the outer diameter of the second straight cylindrical portion is smaller than the outer diameter of the second flange portion; The threaded hole is provided on the second straight cylindrical portion, and the annular convex edge is provided on the end surface of the second flange portion facing away from the second straight cylindrical portion.

7. The connection device according to claim 1, characterized in that The second sleeve is further provided with a second through hole communicating with the threaded hole, and the second through hole is coaxially arranged with the threaded hole; One end of the threaded column away from the end portion passes through the first through hole, the mounting hole and the second through hole in sequence and is threadedly connected to the threaded hole.

8. The connecting device according to claim 7, characterized in that The length of the threaded hole is greater than 2 / 3 of the length of the second through hole.

9. The connecting device according to any one of claims 1 to 8, characterized in that: A guide portion is provided at one end of the threaded column away from the end portion.

10. A vehicle, characterized in that: It comprises a vehicle frame, a chassis, and the connecting device according to any one of claims 1 to 9, wherein the first sleeve is connected to the vehicle frame, and the second sleeve is connected to the chassis.

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