Member fitting structure

Abstract

The invention provides a fitting structure which can improve the joint strength of components with a simple structure and can easily decompose the fitted components. The present invention is a fitting structure for a member in which a hollow or solid first member and a hollow second member are fitted together, in which the inner diameter of the end of the second member gradually increases, the end of the first member is fitted to the inside of the end of the second member, and the end of the second member elastically deforms outward in the radial direction.

Description

Technical Field

[0001] This invention relates to a component fitting structure. Background Technology

[0002] Patent document 1 discloses a pipe fitting method, which has a connector metal part with an annular bulge and an enlarged diameter part formed by embedding an O-ring or other airtight element. The pipe is inserted into the enlarged diameter part so that the front end of the pipe is sealed with the airtight element. The outer periphery of the enlarged diameter part is locally pressurized to form multiple recesses.

[0003] Patent Document 1: Japanese Patent Application Publication No. 57-58930 Summary of the Invention

[0004] In Patent Document 1, a recess is used to improve the bonding strength between the connector metal part and the pipe, but the processing of the recess takes time. Furthermore, if a recess is formed, it is difficult to disassemble the already fitted parts.

[0005] To address this problem, the present invention provides a component fitting structure that improves the bonding strength between components with a simple structure and allows for easy disassembly of the fitted components.

[0006] The present invention is an interlocking structure for a component formed by fitting a first component that is hollow or solid and a second component that is hollow, wherein the inner diameter of the end of the second component gradually expands, the end of the first component is fitted into the inner side of the end of the second component, and the end of the second component elastically deforms radially outward.

[0007] This structure improves the bonding strength between components with a simple design and allows for easy disassembly of the fitted components.

[0008] The inner diameter of the end of the first component is formed to be larger than the inner diameter of the central portion of the second component. This structure improves the bonding strength between components with a simple structure and allows for easy disassembly of the fitted components.

[0009] The present invention is a component fitting structure, which is formed by fitting a hollow first component and a hollow second component together. In the component fitting structure, the outer diameter of the end of the second component gradually decreases, the end of the second component is fitted inside the end of the first component, and the end of the second component elastically deforms radially inward.

[0010] This structure improves the bonding strength between components with a simple design and allows for easy disassembly of the fitted components.

[0011] Invention Effects

[0012] The present invention provides a component fitting structure that improves the bonding strength between components with a simple structure and allows for easy disassembly of the fitted components. Attached Figure Description

[0013] Figure 1 It is a cross-sectional view of the first and second components before fitting together, which is the fitting structure of the components in Embodiment 1.

[0014] Figure 2 This is a cross-sectional view showing the fitting structure of the components in Embodiment 1.

[0015] Figure 3 This is a partial cross-sectional view showing the fitting structure of the components in Embodiment 1.

[0016] Figure 4 This is a cross-sectional view showing the fitting structure of the components in Embodiment 2. Detailed Implementation

[0017] The following uses Figures 1-4 The embodiments of the present invention will be described. Figure 1 It is a cross-sectional view of the first and second components before fitting together, which is the fitting structure of the components in Embodiment 1. Figure 2 This is a cross-sectional view showing the fitting structure of the components in Embodiment 1. Figure 3 This is a partial cross-sectional view showing the fitting structure of the components in Embodiment 1. Figure 4 This is a cross-sectional view showing the fitting structure of the components in Embodiment 2.

[0018] Implementation Method 1

[0019] The fitting structure 30 of the components involved in Embodiment 1 is composed of a first component 10 and a second component 20.

[0020] use Figure 1 The first component 10 and the second component 20 before fitting will be described.

[0021] The first component 10 is a cylindrical tube formed from aluminum alloy material through extrusion. That is, the first component 10 is formed into a hollow shape. The inner and outer diameters of the first component 10 are formed to be the same in the axial direction. Alternatively, the first component 10 may be formed into a solid shape instead of a hollow shape. Furthermore, the inner and outer diameters of the first component 10 may be expanded or reduced in the axial direction.

[0022] The second component 20 is a resistance-welded steel pipe formed into a cylindrical shape by roll forming of hot-rolled steel sheet. That is, the second component 20 is hollow. The second component 20 has a central portion 21 formed in the axial direction and an end portion 22 formed in the axial direction. The central portion 21 has the same inner and outer diameters in the axial direction. On the other hand, the end portion 22 gradually increases in both inner and outer diameters from the central portion 21 side toward the front end side. The inner and outer diameters of the end portion 22 increase linearly, i.e., in a reverse conical shape. The inner and outer diameters of the end portion 22 increase at an angle θ1 relative to the axial direction of the central portion 21. Alternatively, the end portion 22 can increase in a curved shape instead of a linear increase.

[0023] The inner diameter D11 of the first component 10 is larger than the inner diameter D21 of the central portion 21 of the second component 20. Furthermore, the outer diameter D12 of the first component 10 is smaller than the inner diameter D22 of the front end of the end portion 22 of the second component 20.

[0024] Next, use Figure 2 and Figure 3 The fitting structure of the components involved in Embodiment 1 will be described. For example... Figure 2 As shown, the end 11 of the first component 10 is fitted into the inner side of the end 22 of the second component 20, forming a fitting structure 30 of the components.

[0025] The end 22 of the second component 20 elastically deforms radially outward. That is, when the end 11 of the first component 10 is inserted into the inner side of the end 22 of the second component 20, the end 11 of the first component 10 is inserted up to the range of the radially outward elastic deformation of the end 22 of the second component 20. Due to the radially outward elastic deformation of the end 22 of the second component 20, the angle θ2 of the inner and outer diameters of the end 22 relative to the axial direction of the central portion 21 is larger than the angle θ1 before engagement.

[0026] The outer peripheral surface 11a of the end 11 of the first component 10 and the inner peripheral surface 22a of the end 22 of the second component 20 are in contact on the contact surface 31.

[0027] The end 22 of the second component 20 generates a restoring force in the radially inward direction through elastic deformation in the radially outward direction. Specifically, it generates a force in the direction perpendicular to the inner circumferential surface 22a of the end 22 of the second component 20. Figure 3 The restoring force (in direction A) is shown. The restoring force generated at the end 22 of the second component 20 is divided into two forces and acts on the end 11 of the first component 10.

[0028] One is that it originates in a direction perpendicular to the axis of the second component 20. Figure 3 The fastening force F1 (in the direction B shown) acts on the end 11 of the first component 10. The fastening force F1 is expressed by the following formula (1).

[0029] F1=kxcosθ2 ……Equation (1)

[0030] kx represents the magnitude of the restoring force generated at the end 22 of the second component 20.

[0031] Another is that, on the contact surface 31, the frictional force F2 acts in a direction parallel to the inner circumferential surface 22a of the end 22 of the second component 20. Figure 3 (in the direction of C shown). The frictional force F2 is represented by the following equation (2).

[0032] F2=μN ……Equation (2)

[0033] μ is the coefficient of friction between the inner circumferential surface 22a of the end 22 of the second component 20 and the outer circumferential surface 11a of the end 11 of the first component 10.

[0034] N is the normal force generated at the contact surface 31.

[0035] Through these fastening forces F1 and frictional forces F2, the first component 10 and the second component 20 are fitted together with a high bonding strength. Furthermore, if the first component 10 or the second component 20 is pulled out with a force greater than the frictional force F2, the first component 10 and the second component 20 can be easily disassembled. After disassembly, the end 22 of the second component 20 returns to its original shape and can therefore be reused.

[0036] Implementation Method 2

[0037] Next, use Figure 4 The fitting structure 40 of the components according to Embodiment 2 will be described. The fitting structure 40 is composed of a first component 10 and a second component 50. The structure of the first component 10 is the same as that in Embodiment 1, so the description is omitted.

[0038] The second component 50 is a resistance-welded steel pipe formed by roll forming a hot-rolled steel sheet into a cylindrical shape. That is, the second component 50 is hollow. The second component 50 has a central portion 51 formed in the axial direction and an end portion 52 formed in the axial direction. The central portion 51 has the same inner and outer diameters in the axial direction. On the other hand, the inner and outer diameters of the end portion 52 gradually decrease from the central portion 51 side toward the front end side. The inner and outer diameters of the end portion 52 decrease linearly, i.e., tapered. Alternatively, the end portion 52 may decrease in diameter in a curved manner, without the need for a linear decrease.

[0039] The inner diameter D11 of the first component 10 is smaller than the inner diameter D51 of the central portion 51 of the second component 50. Furthermore, the inner diameter D11 of the first component 10 is larger than the outer diameter D52 of the front end of the end portion 52 of the second component 50. Alternatively, the inner diameter D11 of the first component 10 may also be larger than the inner diameter D51 of the central portion 51 of the second component 50.

[0040] The end 52 of the second component 50 is fitted into the inside of the end 11 of the first component 10 to form a fitting structure 40.

[0041] The end 52 of the second component 50 elastically deforms radially inward. That is, when the end 52 of the second component 50 is inserted into the inside of the end 11 of the first component 10, the end 52 of the second component 50 is inserted until the end 52 of the second component 50 elastically deforms radially inward.

[0042] The inner peripheral surface 11b of the end 11 of the first component 10 contacts the outer peripheral surface 52a of the end 52 of the second component 50 on the contact surface 41.

[0043] The end 52 of the second component 50 generates a restoring force in the radially outward direction through elastic deformation in the radially inward direction. Specifically, a restoring force is generated in a direction orthogonal to the outer peripheral surface 52a of the end 52 of the second component 50. The restoring force generated at the end 52 of the second component 50 is divided into two forces and acts on the end 11 of the first component 10.

[0044] One is that a pressing force F3, generated in a direction orthogonal to the axis of the second component 50, acts on the end 11 of the first component 10. The pressing force F3 can be expressed by equation (1) in the same way as the fastening force F1 in embodiment 1.

[0045] Another aspect is that, on the contact surface 41, the frictional force F4 acts in a direction parallel to the outer peripheral surface 52a of the end 52 of the second component 50. The frictional force F4 can be expressed by equation (2) in the same way as the frictional force F2 in embodiment 1.

[0046] Through these pressing forces F3 and frictional forces F4, the first component 10 and the second component 50 are engaged with a high bonding strength. Furthermore, if the first component 10 or the second component 50 is pulled out with a force greater than the frictional force F4, the first component 10 and the second component 50 can be easily disassembled. After disassembly, the end 52 of the second component 50 returns to its original shape and can therefore be reused.

[0047] In the above embodiments, both the first and second components are cylindrical in shape, but their cross-sections can be rectangular or polygonal. Furthermore, both the first and second components are tubes, but either one can also be a connector.

[0048] In the above embodiments, the first component is formed of aluminum alloy and the second component is formed of iron alloy. However, the first component can also be made of iron alloy and the second component can be made of aluminum alloy. Alternatively, both the first component and the second component can be made of iron alloy or aluminum alloy.

[0049] The materials for the first and second components can be metals other than aluminum and iron, such as titanium, and can also be resins such as polyvinyl chloride, polypropylene, polyethylene, phenolic resin, or polymers such as butadiene rubber.

[0050] To improve the insertionability between the first and second components, a triangular or rounded chamfer can be provided at the front end of the first component.

[0051] Furthermore, the present invention is not limited to the above-described embodiments, and appropriate modifications can be made without departing from the spirit of the invention.

[0052] Symbol Explanation

[0053] 10 - First component, 11 - End, 20, 50 - Second component, 21, 51 - Central part, 22, 52 - End, 30, 40 - Fitting structure of components.

Claims

1. A component fitting structure comprising fitting a first component, which is formed as hollow or solid, and a second component, which is formed as hollow, wherein the component fitting structure is characterized in that... The inner diameter of the end of the second component gradually increases. The end of the first component fits inside the end of the second component. The end of the second component undergoes elastic deformation radially outward.

2. The fitting structure of the component according to claim 1, characterized in that, The inner diameter of the end of the first component is formed to be larger than the inner diameter of the central portion of the second component.

3. A component fitting structure comprising fitting a first hollow component and a second hollow component together, wherein the component fitting structure is characterized in that... The outer diameter of the end of the second component gradually decreases. The end of the second component fits inside the end of the first component. The end of the second component undergoes elastic deformation radially inward.

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