Pull rod type self-locking aluminum alloy sealing rivet

Abstract

The pull rod type self-locking aluminum alloy sealing rivet comprises a core rod and a sleeve, the core rod comprises a core rod head, a transition section and a core rod tail, the sleeve is arranged on the core rod in a sleeving mode and wraps the transition section, a breaking groove and a locking groove are formed in the transition section, the interior of the sleeve comprises a sealing cavity and a through hole, and the sealing cavity is communicated with the through hole. The sealing cavity is communicated with the through hole, a core rod straight groove is formed in the outer surface of the tail of the core rod, and the hardness of the core rod is larger than that of the sleeve. The core rod is axially pulled through a common riveting gun, the head of the core rod enters the sleeve, the sleeve deforms and is in interference fit with the hole to complete plugging, the core rod is locked with the sleeve in a matched mode through the locking groove, the auxiliary hole of the shell is effectively plugged, installation can be convenient and fast, and the requirement for the small-specification auxiliary hole is met.

Description

Technical Field

[0001] The utility model belongs to the technical field of sealing and plugging accessories, in particular to a pull-rod type self-locking aluminum alloy sealing rivet. Background Art

[0002] Due to the characteristics of casting or die-casting processes, aluminum alloy housings such as motor housings, heat exchangers, and oil pumps cannot achieve interconnection between the oil circuits, water circuits, coolant circuits, and other liquid circuits in each cavity. This requires opening up the various circuits through processing holes during the machining of the castings. This will result in a large number of process holes being machined on the housing, which need to be sealed after machining.

[0003] Traditional sealing processes mostly use rivet, press rivet and other sealing plugs made of alloy steel, carbon steel, stainless steel, etc. Rivet sealing plugs are favored by major OEMs for their high assembly efficiency, low dependence on personnel skills, and simple assembly tools. However, steel seals have disadvantages such as poor corrosion resistance, potential corrosion between them and aluminum alloys, and easy damage to the inner wall of the process hole during assembly. In particular, the corrosion resistance problem is a key issue that major new energy vehicle manufacturers are currently paying attention to.

[0004] Aluminum alloy has the ability of self-passivation. The material will self-passivate in the air to form a dense protective film on the surface, thereby preventing oxidizing substances from continuing to corrode the interior of the body. It also has the advantages of lightweight, good ductility in the annealed state, and high strength in the solid solution aging state. It is particularly suitable for developing seals for process holes in new energy vehicle shells. However, since its strength is lower than that of steel, there are certain technical difficulties in the development of rivet-type sealing plugs, and defects such as poor sealing performance and inadequate rivets are prone to occur.

[0005] The Chinese patent application number is 2024102168015, which discloses a detachable self-locking channel plugger, a channel plugging kit and a plugging and disassembly method. However, due to the influence of the internal thread structure, the rivet plug cannot be developed into a small-sized plug below φ10. However, the housings of motors, electronic controls, reducers, etc. of new energy vehicles also have a large number of process holes with a diameter less than φ10.

[0006] Therefore, the above problems need to be solved urgently. Utility Model Content

[0007] Purpose of the utility model: In order to overcome the above shortcomings, the utility model provides a pull rod type self-locking aluminum alloy sealing rivet, which uses a commonly used rivet gun to axially pull the core rod so that the core rod head enters the sleeve, causing the sleeve to deform and form an interference fit with the hole to complete the sealing. The core rod is locked with the sleeve through the locking groove to achieve effective sealing of the shell process hole, and can be installed conveniently and quickly, and meets the needs of small-size process holes.

[0008] Technical solution: To achieve the above-mentioned purpose, the utility model provides a pull-rod type self-locking aluminum alloy sealing rivet, comprising a core rod and a sleeve, wherein the core rod comprises a core rod head, a transition section and a core rod tail, the sleeve is sleeved on the core rod and covers the transition section, the transition section is provided with a breaking groove and a locking groove, the interior of the sleeve comprises a sealing cavity and a through hole, the sealing cavity is communicated with the through hole;

[0009] The core rod tail has a straight core rod groove on its outer surface. The core rod is harder than the sleeve. The core rod tail can be used with a common rivet gun. During riveting, as the core rod head enters the sleeve, the sleeve expands and deforms under pressure, achieving an interference fit between the sleeve and the process hole to complete the sealing.

[0010] Furthermore, the core rod head is sequentially provided with a guide surface, an expansion surface, a sealing surface, and a reinforced expansion surface from right to left. The guide surface is a smooth curved surface, while the expansion surface and the reinforced expansion surface are inclined surfaces, with the reinforced expansion surface having a greater inclination angle than the expansion surface. During riveting, the core rod tail is pulled, and the core rod head first enters the sealing cavity under the action of the guide surface, then expands the sealing cavity through the expansion surface. The sealing surface is pressed into the sealing cavity, precisely fitting with the inner wall of the sealing cavity. Finally, the reinforced expansion surface further expands the end of the sleeve and causes a certain amount of axial compression of the sleeve material, thereby making the sleeve and the sealing surface fit more precisely.

[0011] Furthermore, the diameter of the sealing cavity is larger than that of the through hole, and a reducing section is provided at the tail end of the through hole, the diameter of which gradually increases from left to right. During the riveting process, the end surface of the core rod head cooperates with the end surface of the sealing cavity to squeeze the through hole, causing the sleeve material to flow into the locking groove to achieve self-locking. The reducing section is to facilitate the removal of the core rod after it breaks.

[0012] Furthermore, the diameter of the core rod head is larger than that of the transition section and the core rod tail, and the diameter of the core rod head is larger than the diameter of the sealing cavity.

[0013] Furthermore, the depth of the sealing cavity is the same as the length of the core rod head.

[0014] Furthermore, the depth of the breaking groove is greater than the depth of the locking groove. The breaking force of the breaking groove is stable, the assembly consistency is good, and the fracture is neat.

[0015] Furthermore, the two sides of the locking groove are smoothly transitioned inclined surfaces, and the slope of the inclined surface close to the breaking groove is greater than the slope of the inclined surface away from the breaking groove. After riveting is completed, part of the sleeve material flows into the locking groove, and the above design can effectively prevent retreat.

[0016] Furthermore, the sleeve is an aluminum alloy sleeve, and the core rod is carbon steel.

[0017] It can be seen from the above technical solution that the utility model has the following beneficial effects:

[0018] 1. The utility model provides a pull-rod type self-locking aluminum alloy sealing rivet. The sleeve is made of aluminum alloy with good plasticity, and the core rod is made of carbon steel or other materials with high strength. The core rod is pulled axially by a rivet gun, and the core rod is forced to expand radially. The core rod and the sleeve diameter have an interference fit and are automatically locked by the locking groove. After the sleeve is expanded, it has an interference fit with the process hole to achieve sealing, which has high efficiency and reliability.

[0019] 2. The core rod in the present invention eliminates the internal thread structure, and its overall specifications can be made smaller, meeting the sealing requirements of small-sized process holes. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a structural diagram of a pull-rod type self-locking aluminum alloy sealing rivet described in the utility model;

[0021] Figure 2 This is a structural diagram of the core rod described in the utility model;

[0022] Figure 3 This is a partial enlarged view of the core rod head of the utility model;

[0023] Figure 4 It is a partial enlarged view of the transition section described in the present utility model;

[0024] Figure 5 This is a partial enlarged view of the tail of the core rod shown in the present invention;

[0025] Figure 6 This is a schematic structural diagram of the sleeve described in the utility model;

[0026] Figure 7 This is a schematic diagram of the assembly of the core rod and the sleeve before riveting;

[0027] Figure 8 This is a schematic diagram of the assembly after the core rod and the sleeve are riveted.

[0028] In the figure: 1-core rod, 11-core rod head, 111-guide surface, 112-expansion surface, 113-sealing surface, 114-reinforced expansion surface, 12-transition section, 121-breaking groove, 122-locking groove, 13-core rod tail, 131-core rod straight groove, 2-sleeve, 21-sealing cavity, 22-through hole, 221-diameter reducing section. DETAILED DESCRIPTION

[0029] 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.

[0030] like Figure 1 、 Figure 2 and Figure 4 As shown, a pull-rod type self-locking aluminum alloy sealing rivet includes a core rod 1 and a sleeve 2. The core rod 1 includes a core rod head 11, a transition section 12, and a core rod tail 13. The sleeve 2 is sleeved on the core rod 1 and covers the transition section 12. The transition section 12 is provided with a breaking groove 121 and a locking groove 122. The sleeve 2 includes a sealing cavity 21 and a through hole 22 inside. The sealing cavity 21 is connected to the through hole 22.

[0031] like Figure 5 As shown, a core rod straight groove 131 is opened on the outer surface of the core rod tail 13, and the hardness of the core rod 1 is greater than that of the sleeve 2.

[0032] In this embodiment, if Figure 3 As shown, the core rod head 11 is provided with a guide surface 111, an expansion surface 112, a sealing surface 113 and a strengthening expansion surface 114 from right to left in sequence. The guide surface 111 is a smooth curved surface, the expansion surface 112 and the strengthening expansion surface 114 are inclined surfaces, and the inclination angle of the strengthening expansion surface 114 is greater than that of the expansion surface 112.

[0033] In this embodiment, if Figure 6 As shown, the diameter of the sealing cavity 21 is larger than the diameter of the through hole 22 , and a diameter-reducing section 221 is provided at the tail end of the through hole 22 , and the diameter of the diameter-reducing section 221 gradually increases from left to right.

[0034] In a further optimized solution, the diameter of the core rod head 11 is larger than the transition section 12 and the core rod tail 13 , and the diameter of the core rod head 11 is larger than the diameter of the sealing cavity 21 .

[0035] In a further optimized solution, the depth of the sealing cavity 21 is the same as the length of the core rod head 11 .

[0036] Further optimization solutions, such as Figure 4 As shown, the depth of the breaking groove 121 is greater than the depth of the locking groove 122 .

[0037] Please refer again Figure 4 The two sides of the locking groove 122 are smoothly transitioned inclined surfaces, and the slope of the inclined surface close to the breaking groove 121 is greater than the slope of the inclined surface away from the breaking groove 121.

[0038] In this embodiment, the sleeve 2 is an aluminum alloy sleeve, and the core rod 1 is carbon steel. It should be noted that the sleeve 2 in this embodiment is not limited to aluminum alloy, but can also be other metal materials that are easy to flow and have good sealing performance. Similarly, the core rod 1 is not limited to carbon steel, but can also be other high-strength metal materials.

[0039] The utility model provides a pull rod type self-locking aluminum alloy sealing rivet. Figure 7 The figure is a schematic diagram of the assembly of the core rod 1 and the sleeve 2 before riveting. When riveting, the core rod tail 13 is matched with the rivet gun, the sleeve 2 is inserted into the process hole to be sealed, and the rivet gun is started to pull the core rod tail 13 to drive the core rod head 11 into the sealing cavity 21 and make the sealing cavity 21 expand radially until the core rod 1 breaks from the breaking groove 121. Figure 8 As shown, at this time, the sleeve 2 and the process hole are interference fit to complete the blocking, the core rod head 11 and the sleeve 2 are interference fit and the two are self-locking through the locking groove 122 and the inner surface of the through hole 22.

[0040] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements can be made without departing from the principles of the present invention. These improvements should also be regarded as within the scope of protection of the present invention.

Claims

1. A pull rod type self-locking aluminum alloy sealing rivet, characterized in that: The invention comprises a core rod (1) and a sleeve (2), wherein the core rod (1) comprises a core rod head (11), a transition section (12) and a core rod tail (13), the sleeve (2) is sleeved on the core rod (1) and covers the transition section (12), the transition section (12) is provided with a breaking groove (121) and a locking groove (122), the sleeve (2) comprises a sealing cavity (21) and a through hole (22), and the sealing cavity (21) is communicated with the through hole (22); A core rod straight groove (131) is provided on the outer surface of the core rod tail (13), and the core rod (1) has a harder hardness than the sleeve (2).

2. The pull rod type self-locking aluminum alloy sealing rivet according to claim 1, characterized in that: The core rod head (11) is provided with a guide surface (111), an expansion surface (112), a sealing surface (113) and a strengthening expansion surface (114) in sequence from right to left. The guide surface (111) is a smooth curved surface, the expansion surface (112) and the strengthening expansion surface (114) are inclined surfaces, and the inclination angle of the strengthening expansion surface (114) is greater than that of the expansion surface (112).

3. The pull rod type self-locking aluminum alloy sealing rivet according to claim 1, characterized in that: The diameter of the sealing cavity (21) is larger than the diameter of the through hole (22), and a diameter-reducing section (221) is provided at the tail end of the through hole (22), and the diameter of the diameter-reducing section (221) gradually increases from left to right.

4. The pull rod type self-locking aluminum alloy sealing rivet according to claim 1, characterized in that: The diameter of the core rod head (11) is larger than that of the transition section (12) and the core rod tail (13), and the diameter of the core rod head (11) is larger than that of the sealing cavity (21).

5. The pull rod type self-locking aluminum alloy sealing rivet according to claim 1, characterized in that: The depth of the sealing cavity (21) is the same as the length of the core rod head (11).

6. The pull rod type self-locking aluminum alloy sealing rivet according to claim 1, characterized in that: The depth of the breaking groove (121) is greater than the depth of the locking groove (122).

7. The pull rod type self-locking aluminum alloy sealing rivet according to claim 1, characterized in that: Both sides of the locking groove (122) are smoothly transitioned inclined surfaces, and the slope of the inclined surface on the side close to the breaking groove (121) is greater than the slope of the inclined surface on the side away from the breaking groove (121).

8. The pull rod type self-locking aluminum alloy sealing rivet according to claim 1, characterized in that: The sleeve (2) is an aluminum alloy sleeve, and the core rod (1) is carbon steel.

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