Novel tight fit bolt assembly

Abstract

The invention discloses a novel close fit bolt assembly in the technical field of fasteners, the novel close fit bolt assembly comprises a bolt and a nut which are matched for use, a check ring, an outer lining, an inner lining, an outer lining and a check ring are sequentially connected between the bolt and the nut in a sleeved mode, the outer lining is provided with a first conical surface, and the inner lining is provided with a second conical surface matched with the first conical surface for use. The outer lining expands outwards to be tightly attached to the inner hole wall of the connecting interlayer, the inner lining contracts inwards to be tightly attached to a polish rod of the bolt, and along with tightening of the nut, the tight fit bolt assembly and the connecting interlayer achieve the tight fit assembly effect.

Description

Technical Field

[0001] The invention relates to the technical field of fasteners, and in particular to a novel tight-fitting bolt assembly. Background Art

[0002] The connection of parts is usually done with bolts. When bolts are assembled with connected parts, they are divided into clearance fit, transition fit and interference fit. The clearance fit is easy to assemble, while the transition and interference fit are difficult to assemble. The transition and interference fit are called tight fit. Compared with the clearance fit, the tight fit provides higher connection strength and coaxiality, so it is more suitable for occasions that need to transmit larger forces or torques.

[0003] In the case of tight fit, press-in, heat-fitting and cold-fitting methods are usually used for assembly. The press-in method is to press the part to be assembled into another fixed part by applying a certain force to achieve the purpose of fastening connection. Pressing also requires the use of special installation tools, such as sliding presses, press machines, and extruders. The heat-fitting method is a method of assembling parts using the principle of thermal expansion and contraction. The cold-fitting method is an assembly method in which the enclosed part is cooled with a coolant to shrink its size, and then the enclosed part is installed to achieve an interference fit after the temperature rises. However, all of the above methods require the use of external tools (such as heating equipment or refrigeration equipment), and the assembly is difficult.

[0004] In order to facilitate assembly under tight fit conditions, a new type of tight fit bolt assembly is designed to solve the assembly difficulties under tight fit conditions. Summary of the invention

[0005] The present invention aims to provide a novel tight-fit bolt assembly to achieve a tight-fit assembly effect between the tight-fit bolt assembly and the connecting interlayer.

[0006] In order to solve the above problems, the present invention provides the following technical solutions:

[0007] A novel tight-fitting bolt assembly comprises a bolt and a nut for use together, wherein a retaining ring, an outer bushing, an inner bushing, an outer bushing and a retaining ring are sequentially sleeved between the bolt and the nut, the outer bushing is provided with a first conical surface, and the inner bushing is provided with a second conical surface for use together with the first conical surface.

[0008] Working principle and beneficial effects of the present invention:

[0009] Install a retaining ring, an outer bushing, an inner bushing and an outer bushing on the bolt in sequence; then install the whole into the hole of the connecting interlayer, then install another retaining ring on the bolt and screw in the nut.

[0010] When the nut is screwed into the thread of the bolt, the nut pushes the retaining ring, the outer sleeve, the inner sleeve and the outer sleeve to move to the left. Through the mutual extrusion between the first conical surface of the outer sleeve and the second conical surface of the inner sleeve, the outer sleeve expands outward and fits tightly against the inner hole wall of the connecting interlayer, and the inner sleeve shrinks inward and fits tightly against the bare rod of the bolt. As the nut is tightened, the tight-fitting bolt assembly and the connecting interlayer achieve a tight-fitting assembly effect.

[0011] Optimally, the bolt is a hexagonal bolt and the nut is a dodecagonal nut.

[0012] Optimally, the number of the outer bushing and the inner bushing is multiple. The number of the outer bushing and the inner bushing can be multiple according to the thickness of the connecting interlayer, so that the tight fit effect is better.

[0013] Optimally, the outer bushing includes an outer bushing with a longer length and an outer bushing with an angled length. The outer bushing with a longer length and the outer bushing with a shorter length are used in combination, and the outer bushing with a longer length is extended to both sides of the sandwich section, and the section is squeezed by the outer bushing, thereby forming an extrusion on both sides of the sandwich section, and the extrusion force between the outer bushing and the sandwich section is used to improve the assembly and fastening effect.

[0014] Optimally, the retaining ring is provided with a conical hole and a circular hole connected to each other. The conical hole provides a space for the outer bushing to deform, and the circular hole provides a space for installing the bolt. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of assembling a new type of tight-fit bolt group;

[0016] Figure 2 It is a schematic diagram of a new type of tight-fit bolt assembly after assembly;

[0017] Figure 3 It is a schematic diagram of a hexagonal bolt;

[0018] Figure 4 It is a schematic diagram of the outer bushing (short);

[0019] Figure 5 Schematic diagram of the inner sleeve. DETAILED DESCRIPTION

[0020] The following is further described in detail through specific implementation methods:

[0021] The figure marks in the drawings of the specification include: hexagonal bolt 1, retaining ring 2, outer bushing (short) 3, inner bushing 4, outer bushing (long) 5, dodecagonal nut 6, hexagonal head 1-1, bare rod 1-2, external thread 1-3, first cone surface 3-1, first notch 3-2, second cone surface 4-1, second notch 4-2.

[0022] In the following statements, directional words such as "left", "right", "up", and "down" are all based on the directions shown in the diagram. In practice, if the corresponding structures are changed in the same direction based on the directions while keeping the relative positions unchanged, it will not affect the implementation of the plan.

[0023] Example: Figure 1 As shown, a new type of tight-fit bolt assembly includes a hexagonal bolt 1, two retaining rings 2, two outer bushings (short) 3, two inner bushings 4, an outer bushing (long) 5, and a dodecagonal nut 6. The hexagonal bolt 1 includes a hexagonal head 1-1, a plain rod 1-2, and an external thread 1-3.

[0024] like Figure 4 and Figure 5 As shown, the outer bushing (short) 3 and the outer bushing (long) 5 are provided with a first notch 3-2, and the inner bushing 4 is provided with a second notch 4-2. The first notch 3-2 and the second notch 4-2 provide deformation space.

[0025] A first conical surface 3 - 1 is provided at the contact points of the outer bushing (short) 3 , the outer bushing (long) 5 and the inner bushing 4 , and a second conical surface 4 - 1 is provided at the inner bushing 4 .

[0026] A new type of tight-fit bolt assembly is used: the retaining ring 2, the outer bushing (short) 3, the inner bushing 4, the outer bushing (long) 5, the inner bushing 4, the outer bushing (short) 3 are sequentially installed on the hexagonal bolt 1; then the whole is installed in the hole of the connecting interlayer, and then the retaining ring 2 is installed on the hexagonal bolt 1, and the twelve-pointed nut 6 is screwed in. Figure 2 , Figure 3 .

[0027] When the dodecaagonal nut 6 is screwed into the external thread 1-3 of the hexagonal bolt 1, the dodecaagonal nut 6 pushes the retaining ring 2, the outer bushing (short) 3, the inner bushing 4, and the outer bushing (long) 5 to move to the left, and through the first conical surface 3-1 of the outer bushing (short) 3, the outer bushing (short) 3 expands outward and fits tightly against the inner hole wall of the connecting interlayer. Similarly, through the first conical surface 3-1 of the outer bushing (long) 5, the outer bushing (long) 5 expands outward and fits tightly against the inner hole wall of the connecting interlayer. Through the conical surface 4-2 of the inner bushing 4, the inner bushing 4 shrinks inward and fits tightly against the bare rod 1-2 of the hexagonal bolt 1. As the dodecaagonal nut 6 is tightened, the tight-fitting bolt assembly and the connecting interlayer achieve a tight-fitting assembly effect.

[0028] The outer bushing (short) 3 and the outer bushing (long) 5 can be provided in plurality according to the thickness of the connecting interlayer to achieve a better tight fit effect. The lengths of the outer bushing (short) 3 and the outer bushing (long) 5 and the inner bushing 4 can be selected.

[0029] The standard parts used in the present invention can all be purchased from the market, and special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the prior art. The machinery, parts and equipment all adopt conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, which will not be described in detail here.

Claims

1. A novel tight-fitting bolt assembly, characterized in that: It comprises a bolt and a nut used in combination, wherein a retaining ring, an outer bushing, an inner bushing, an outer bushing and a retaining ring are sequentially sleeved between the bolt and the nut, the outer bushing is provided with a first conical surface, and the inner bushing is provided with a second conical surface used in combination with the first conical surface.

2. A novel tight-fit bolt assembly according to claim 1, characterized in that: The bolts are hexagonal bolts, and the nuts are dodecagonal nuts.

3. A novel tight-fit bolt assembly according to claim 2, characterized in that: The number of the outer bushing and the inner bushing is plural.

4. A novel tight-fit bolt assembly according to claim 3, characterized in that: The outer bushing includes an outer bushing with a longer length and an outer bushing with an angled length.

5. A novel tight-fit bolt assembly according to any one of claims 1 to 4, characterized in that: The outer bushing and the inner bushing are provided with notches in the circumferential direction.

6. A novel tight-fit bolt assembly according to claim 5, characterized in that: The retaining ring is provided with a conical hole and a circular hole connected to each other.

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