Pressure-bearing connecting structure and shell

Abstract

The utility model is suitable for the technical field of machine manufacturing and assembling, and provides a pressure-bearing connecting structure and a shell, the pressure-bearing connecting structure comprises a first base body, a second base body, a pressure-bearing part and a fastener, the first base body is provided with a fixing hole, the second base body is provided with a through hole, the pressure-bearing part is a prefabricated part and is arranged in the through hole, and the peripheral surface of the pressure-bearing part is tightly pressed with the inner wall of the through hole; the rod portion of the fastener penetrates through the pressure-bearing piece and the through hole and is fixed in the fixing hole, and the head portion of the fastener abuts against the second end face of the pressure-bearing piece and the surface of the second base body. The pre-tightening force of the fastener is dispersed on the surface of the second base body, the inner wall of the through hole and the first base body, the acting force is prevented from completely and directly acting on the surface of the second base body, deformation and damage to the surface of the second base body caused by stress concentration in a small range are avoided, and the pressure bearing piece is a prefabricated piece and can be arranged in the second base body in a simpler and more convenient mode. And the manufacturing and assembling cost is low. The surface of the shell is not easy to deform and damage, and the manufacturing and assembling cost is low.

Description

Technical Field

[0001] The present application relates to the technical field of mechanical manufacturing and assembly, and in particular to a pressure-bearing connection structure and a shell. Background Art

[0002] At present, in the mechanical manufacturing, threaded engagement structures represented by bolts, screws, etc. are commonly used fixed connectors. For example, the threaded portion of the bolt is engaged in the first structure, and the head of the bolt passes through the second structure and abuts against the second structure, thereby pressing the first structure and the second structure.

[0003] In order to ensure sufficient locking force, the preload of the bolt is usually increased, but excessive preload will cause the surface of the second structure to be crushed and deformed. In order to improve this problem, gaskets, such as elastic gaskets or metal washers, are often added to the surface of the second structure. After the gasket is deformed by force, it can buffer the damage to the surface of the second structure caused by the force.

[0004] However, the cushioning effect of the above-mentioned gasket is limited; moreover, the performance of the gasket itself may decline with the increase of usage time, and continuing to increase the preload force will continue to cause the surface of the second structure to be damaged, especially when the strength of the second structure is lower than that of the first structure, such as the first structure is a metal structure and the second structure is a plastic structure. Utility Model Content

[0005] The purpose of the embodiments of the present application is to provide a pressure-bearing connection structure, aiming to solve the technical problem that the existing fastening connection method easily causes deformation and damage to the structure surface.

[0006] The first base body is provided with a fixing hole;

[0007] The second substrate is provided with a through hole, and the inner diameter of the through hole is larger than the inner diameter of the fixing hole;

[0008] A pressure-bearing member is a prefabricated member, and is disposed in the through hole, wherein the outer peripheral surface of the pressure-bearing member is pressed tightly against the inner wall of the through hole, and the first end surface of the pressure-bearing member abuts against the surface of the first substrate facing the second substrate;

[0009] The fastener comprises a stem and a head, wherein the stem passes through the pressure-bearing member and the through hole and is fixed in the fixing hole, and the head abuts against the second end surface of the pressure-bearing member and the surface of the second substrate facing away from the first substrate.

[0010] In one embodiment, a buffer portion is convexly provided on the end surface of the second base body facing the head, and the circumferential dimension and / or radial dimension of the buffer portion gradually decreases as it moves away from the first base body.

[0011] In one embodiment, an annular groove is provided on the end surface of the second base body facing the head on a side close to the inner circumferential wall of the through hole, the buffer portion is provided in the annular groove, an annular convex portion is formed on the outer periphery of the annular groove, and the height of the annular convex portion is smaller than the height of the buffer portion.

[0012] In one embodiment, the buffer portion includes a plurality of buffer ribs spaced apart along the circumferential direction, wherein the buffer ribs are triangular in shape in the circumferential direction and have a uniform radial thickness.

[0013] In one embodiment, the first substrate is a metal part, and the second substrate is an integrally injection-molded plastic part.

[0014] In one embodiment, the pressure bearing member is provided with a notch connecting from the first end surface to the second end surface.

[0015] In one embodiment, the pressure-bearing member is a metal member, and two side surfaces of the notch are parallel to the axial direction of the fixing hole.

[0016] In one embodiment, a chamfer is provided between the outer circumferential surface of the pressure-bearing member and the first end surface; and / or a chamfer is provided between the outer circumferential surface of the pressure-bearing member and the second end surface.

[0017] In one embodiment, the fixing hole is a threaded hole, and the rod portion includes a threaded portion, and the threaded portion is engaged with the threaded hole; or, the rod portion extends axially out of the fixing hole and is fixed to the inner surface of the first substrate.

[0018] An embodiment of the present application also provides a shell, which includes an upper shell and a lower shell, and a pressure-bearing connection structure as described in the above embodiments, wherein the first base is fixedly connected to the lower shell or is a part of the lower shell, and the second base is fixedly connected to the upper shell or is a part of the upper shell.

[0019] The pressure-bearing connection structure and the housing provided in the embodiments of the present application have the following beneficial effects:

[0020] In the pressure-bearing connection structure, the pressure-bearing member is pressed against the inner wall of the through hole of the second substrate, and axially abuts against the first substrate and the head of the fastener. The preload force of the fastener is dispersed on the surface of the second substrate, the inner wall of the through hole and the first substrate. In this way, it is avoided that the force acts entirely and directly on the surface of the second substrate, thereby avoiding deformation and damage to the surface of the second substrate caused by stress concentration in a small range. Moreover, the pressure-bearing member is a prefabricated member and can be arranged in the second substrate in a simpler way, without injection molding, etc., and the manufacturing and assembly costs are low. The surface of the shell is not easily deformed or damaged, and the manufacturing and assembly costs are low. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 is a schematic diagram of the three-dimensional structure of the pressure-bearing connection structure provided in an embodiment of the present application, wherein the fastener is in an unlocked state;

[0023] Figure 2 yes Figure 1 The enlarged view of point A in the middle;

[0024] Figure 3 It is a three-dimensional exploded schematic diagram of a pressure-bearing connection structure provided in an embodiment of the present application;

[0025] Figure 4 is a schematic diagram of the surface structure of the second substrate in the pressure-bearing connection structure provided in an embodiment of the present application;

[0026] Figure 5 is a schematic axial cross-sectional view of a pressure-bearing connection structure provided in an embodiment of the present application;

[0027] Figure 6 is a schematic diagram of the three-dimensional structure of the pressure-bearing connection structure provided in an embodiment of the present application, wherein the fastener is in a locked state;

[0028] Figure 7 yes Figure 6 Enlarged view of point B in the middle.

[0029] The meanings of the marks in the figure are:

[0030] 100-pressure-bearing connection structure;

[0031] 1-first substrate, 10-fixing hole;

[0032] 2-second base, 20-through hole, 21-buffer portion, 210-buffer rib, 22-annular groove, 23-annular convex portion;

[0033] 3-pressure bearing member, 31-first end surface, 32-second end surface, 33-notch, 34-chamfer;

[0034] 4-fastener, 41-head, 42-stem. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0036] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly or indirectly fixed or disposed on the other component. When a component is referred to as being "connected to" another component, it may be directly or indirectly connected to the other component. The orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. is based on the orientation or positional relationship shown in the accompanying drawings and is only for the convenience of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation of this patent. The terms "first" and "second" are only used for the convenience of description and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. "Multiple" means two or more, unless otherwise clearly and specifically defined.

[0037] In order to illustrate the technical solution described in this application, a detailed description is given below in conjunction with specific drawings and embodiments.

[0038] See also Figure 1 , Figure 3 and Figure 5 As shown, the embodiment of the present application provides a pressure-bearing connection structure 100, which includes a first substrate 1, a second substrate 2, a pressure-bearing member 3 and a fastener 4. The first substrate 1 and the second substrate 2 are two structures that need to be fixedly connected together. The first substrate 1 is provided with a fixing hole 10, and the second substrate 2 is provided with a through hole 20, and the inner diameter of the through hole 20 is larger than the inner diameter of the fixing hole 10; the pressure-bearing member 3 is a prefabricated member, which is arranged in the through hole 20, and the outer peripheral surface of the pressure-bearing member 3 is pressed against the inner wall of the through hole 20, that is, there is no gap between the pressure-bearing member 3 and the inner wall of the through hole 20, but they are pressed against each other to generate a certain static friction between the two; in addition, the pressure-bearing member 3 The component 3 has a first end face 31 and a second end face 32 along the axial direction (referring to the axial direction of the fixing hole 10), and the first end face 31 abuts against the surface of the first substrate 1 facing the second substrate 2; the fastener 4 includes a rod 42 and a head 41, the size of the head 41 is larger than the size of the rod 42, after the rod 42 passes through the pressure-bearing component 3 and the through hole 20, it partially enters the fixing hole 10 and is fixed in the fixing hole 10, and the head 41 abuts against the second end face 32 of the pressure-bearing component 3 and the surface of the second substrate 2 (the size of the head 41 is also larger than the inner diameter of the through hole 20).

[0039] In the pressure-bearing connection structure 100 provided in the embodiment of the present application, the pressure-bearing member 3 is pressed against the inner wall of the through hole 20 of the second substrate 2, and axially abuts against the first substrate 1 and the head 41 of the fastener 4. The preload force of the fastener 4 is dispersed on the surface of the second substrate 2, the inner wall of the through hole 20 and the first substrate 1. In this way, it is avoided that the entire force acts directly on the surface of the second substrate 2, thereby avoiding deformation and damage to the surface of the second substrate 2 caused by stress concentration in a small range. In addition, the pressure-bearing member 3 is a prefabricated member and can be arranged in the second substrate 2 in a simpler manner, without the need for injection molding, etc., and the manufacturing and assembly costs are relatively low.

[0040] The materials of the first substrate 1 and the second substrate 2 are not limited. The first substrate 1 can be a metal part or a non-metal part, such as a plastic part or a ceramic part; the second substrate 2 can also be a metal part or a non-metal part, such as a plastic part or a ceramic part.

[0041] Generally, when the strength of the second substrate 2 is low, the head 41 of the fastener 4 is more likely to cause surface deformation of the second substrate 2. Therefore, the pressure-bearing connection structure 100 provided in the embodiment of the present application is particularly suitable for the case where the strength of the second substrate 2 is lower than that of the first substrate 1.

[0042] In a specific embodiment, the first substrate 1 is a metal part, such as a steel part, and the second substrate 2 is a plastic part.

[0043] Furthermore, the first substrate 1 and the second substrate 2 may be integrally formed by injection molding, that is, the second substrate 2 is formed by injection molding on the basis of the first substrate 1. In this way, the surfaces where the first substrate 1 and the second substrate 2 contact each other also provide further connection between the two, and overall, the connection between the first substrate 1 and the second substrate 2 is more stable.

[0044] The pressure bearing member 3 is mainly used to bear the pre-tightening force of the fastener 4. Therefore, the material of the pressure bearing member 3 is preferably a high-strength material. For example, the pressure bearing member 3 can be a metal member, a ceramic member, or other plastic member that can withstand a large pressure. The selection is based on the connection and fastening requirements between the first substrate 1 and the second substrate 2.

[0045] In this embodiment, the first substrate 1 is a metal part, and the pressure-bearing part 3 is also a metal part, such as a steel part.

[0046] As mentioned above, the outer circumference of the pressure-bearing member 3 is pressed against the inner wall of the through hole 20, which can be achieved by matching the outer diameter of the pressure-bearing member 3 with the inner diameter of the through hole 20. Specifically, the outer circumference of the pressure-bearing member 3 is greater than or equal to the inner diameter of the through hole 20. Optionally, the outer circumference of the pressure-bearing member 3 is greater than the inner diameter of the through hole 20.

[0047] In this case, the pressure member 3 can be installed by being squeezed into the through hole 20. Alternatively, a certain matching margin can be pre-made between the pressure member 3 and the second substrate 2 by cooling the pressure member 3 and / or heating the second substrate 2, and then the pressure member 3 can be placed.

[0048] In one embodiment, see Figure 3 As shown, the pressure-bearing member 3 is provided with a notch 33 which is connected from the first end face 31 to the second end face 32. The notch 33 is provided so that the pressure-bearing member 3 will deform and shrink inward when subjected to radial force. In this way, the pressure-bearing member 3 can be conveniently placed in the through hole 20. When the pressure-bearing member 3 enters the through hole 20 and the radial force is cancelled, the pressure-bearing member 3 can automatically return and be pressed against the inner wall of the through hole 20 by its own elasticity. This simultaneously realizes the simple assembly of the pressure-bearing member 3 in the through hole 20 and the tight fit between the pressure-bearing member 3 and the through hole 20.

[0049] Any side wall of the notch 33 may be parallel to the axial direction or inclined at a certain angle to the axial direction. No specific limitation is made here, and the specific selection is preferably made to facilitate the process and enhance the operability when processing the pressure bearing member 3 and the notch 33 thereof.

[0050] In a specific embodiment, both side walls of the notch 33 are parallel to the axial direction. Further, the two side walls are also parallel to each other.

[0051] See also Figure 3 As shown, a chamfer 34 is provided between the outer circumference of the pressure-bearing part 3 and the first end face 31, and a chamfer 34 is also provided between the outer circumference of the pressure-bearing part 3 and the second end face 32. The purpose of such arrangement is that, firstly, the inclined surface formed by the chamfer 34 can be used as a guide surface, which also makes the outer dimensions of the two ends of the pressure-bearing part 3 smaller. When the pressure-bearing part 3 is placed in the through hole 20, the end of the pressure-bearing part 3 can be aligned with the through hole 20 more quickly, and the inclined surface can play a certain guiding role, so that the pressure-bearing part 3 can be placed in the through hole 20 more quickly and accurately; secondly, for the pressure-bearing part 3 formed by machining, the surface edge may be rough and sharp in general. The chamfer 34 between the two ends and the outer circumference can blunt the edge to avoid harm to operators, assemblers, etc.

[0052] In other optional embodiments, it is also possible to set only one of the chamfer 34 between the outer circumferential surface of the pressure-bearing member 3 and the first end surface 31 and the chamfer 34 between the outer circumferential surface of the pressure-bearing member 3 and the second end surface 32 according to actual application conditions.

[0053] As mentioned above, the head 41 of the fastener 4 is pressed against the second end face 32 of the pressure-bearing member 3 and the surface of the second substrate 2 at the same time. Therefore, the axial height of the pressure-bearing member 3 should be equal to the height of the through hole 20, that is, the second end face 32 of the pressure-bearing member 3 is flush with the surface of the second substrate 2. In addition, when the material of the second substrate 2 is, for example, plastic, the plastic material will undergo a certain slight deformation when subjected to force. Therefore, in the non-locked state, the axial height of the pressure-bearing member 3 is designed to be slightly smaller than the axial height of the through hole 20, so that the second end face 32 is slightly lower than the surface of the second substrate 2.

[0054] In one embodiment, in order to improve the adaptive fit between the pressure-bearing member 3 and the through hole 20 in the axial height, it is convenient to process the pressure-bearing member 3 and the second substrate 2, such as Figure 3 , Figure 4 As shown, a buffer portion 21 is protruded on the end face of the second substrate 2 facing the head 41. The buffer portion 21 is axially higher than the second end face 32 of the pressure-bearing member 3 (in the non-locked state). The circumferential dimension and / or radial dimension of the buffer portion 21 gradually decreases as it moves away from the first substrate 1 in the axial direction.

[0055] That is, the width of the buffer portion 21 (referring to the dimension in the circumferential direction) is gradually reduced, and / or the thickness of the buffer portion 21 (referring to the dimension in the radial direction) is gradually reduced. The purpose of such a setting is that the end of the buffer portion 21 is narrower and / or thinner, and when subjected to the force from the head 41 of the fastener 4, the end is more likely to deform, and as the head 41 continues to approach, the entire buffer portion 21 is more likely to deform (please refer to Figure 1 , Figure 2 as well as Figure 6 and Figure 7 As shown). In this way, the buffer portion 21 is compressed by the head portion 41 after deformation, until the head portion 41 abuts against the second end surface 32 of the pressure-bearing member 3, and the buffer portion 21 is no longer deformed. At this time, the head portion 41 compresses the pressure-bearing member 3 and the second base 2 at the same time.

[0056] The material of the buffer portion 21 can be selected to be a material that can be deformed after being subjected to a certain pressure but is not easily broken, such as a plastic material, specifically PVC (Polyvinyl chloride), PE (Polyethylene), etc.

[0057] The buffer portion 21 may be integrally injection-molded on the second substrate 2. That is, the second substrate 2 is made of plastic material, and the buffer portion 21 is integrally formed during the injection molding process.

[0058] Optionally, the buffer portion 21 is disposed on the second end surface 32 at a position close to the inner peripheral edge. Figure 4As shown. Further optionally, the radial inner side surface of the buffer portion 21 and the inner side surface of the through hole 20 are flush with each other (being flush with each other does not mean that both are planes, but means that the radial inner side surface of the buffer portion 21 is an axial extension of the inner side surface of the through hole 20). The purpose of such a design is that the buffer portion 21 is arranged as close to the inside as possible to ensure that it can be pressed more by the head 41, and further improve the adaptive fit between the pressure-bearing member 3 and the through hole 20 in the axial height.

[0059] Among them, see Figure 3 and Figure 4 As shown, the inner side of the surface of the second substrate 2 forms an annular groove 22 surrounding the through hole 20. Accordingly, the outer portion of the annular groove 22 is relatively protruding, which is defined as an annular convex portion 23. The height of the annular convex portion 23 is less than the height of the buffer portion 21 (referring to the free height when not pressed), and the buffer portion 21 is arranged in the annular groove 22. The purpose of this design is that after the buffer portion 21 is pressed and deformed by the head 41, its height will be reduced, but it will not disappear completely. At this time, the surrounding annular convex portion 23 can actually serve as a circle of retaining wall structure to cover the deformed buffer portion 21, so that the user can observe the deformed buffer portion 21 as little as possible, and the appearance is more complete and beautiful.

[0060] Please continue reading Figure 4 As shown, in one embodiment, the buffer portion 21 includes a plurality of buffer ribs 210 arranged at intervals along the circumferential direction, and the buffer ribs 210 are triangular in the circumferential direction and have a uniform radial thickness. The uniform radial thickness is conducive to the convenient processing and manufacturing of the second substrate 2. The plurality of buffer ribs 210 are arranged at intervals, so that the annular groove 22 and the through hole 20 are interconnected in the radial direction, which is also conducive to the processing and manufacturing of the annular groove 22.

[0061] In other optional embodiments, the buffer portion 21 may be in other shapes, such as a trapezoid in the circumferential direction or a triangle in the radial direction; or, the buffer portion 21 may be continuously arranged in a closed loop in the circumferential direction.

[0062] The connection between the rod portion 42 and the fixing hole 10 of the first substrate 1 can be achieved in a variety of ways.

[0063] One way is that the fixing hole 10 is a threaded hole, and the rod 42 includes a threaded portion (not shown). After the threaded portion is engaged with the threaded hole, the rod 42 is fixed. Figure 5 shown.

[0064] Another way is that a cavity (not shown) is formed in the first substrate 1, the cavity is connected to the fixing hole 10, the rod 42 protrudes axially, extends out of the fixing hole 10 and is located in the cavity, the part of the rod 42 extending out of the fixing hole 10 has a threaded portion, the nut engages with the threaded portion, and the nut is abutted against the bottom wall of the cavity, thereby being fixed to the inner surface of the first substrate 1.

[0065] Another way is that a cavity (not shown) is formed in the first substrate 1, the cavity is connected to the fixing hole 10, the rod 42 protrudes axially, extends out of the fixing hole 10 and is located in the cavity, and a blocking member such as a latch (not shown) radially passes through the rod 42 and abuts on the bottom wall of the cavity, thereby being fixed to the inner surface of the first substrate 1.

[0066] In addition, the embodiment of the present application further provides a housing (not shown), which includes an upper housing and a lower housing, and a pressure-bearing connection structure 100 as described in the above embodiments, wherein the first substrate 1 is fixedly connected to the lower housing or is a part of the lower housing, and the second substrate 2 is fixedly connected to the upper housing or is a part of the upper housing. Thus, through the pressure-bearing connection structure 100, a fixed connection between the upper housing and the lower housing is achieved, and the surface of the upper housing is not easily deformed or damaged.

[0067] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A pressure-bearing connection structure, characterized in that: include: The first base body is provided with a fixing hole; The second substrate is provided with a through hole, and the inner diameter of the through hole is larger than the inner diameter of the fixing hole; A pressure-bearing member is a prefabricated member, and is disposed in the through hole, wherein the outer peripheral surface of the pressure-bearing member is pressed tightly against the inner wall of the through hole, and the first end surface of the pressure-bearing member abuts against the surface of the first substrate facing the second substrate; The fastener comprises a stem and a head, wherein the stem passes through the pressure-bearing member and the through hole and is fixed in the fixing hole, and the head abuts against the second end surface of the pressure-bearing member and the surface of the second substrate facing away from the first substrate.

2. The pressure-bearing connection structure according to claim 1, characterized in that: A buffer portion is convexly disposed on the end surface of the second base body facing the head, and a circumferential dimension and / or a radial dimension of the buffer portion gradually decreases as it moves away from the first base body.

3. The pressure-bearing connection structure according to claim 2, characterized in that: An annular groove is provided on the end surface of the second base body facing the head on one side close to the inner peripheral wall of the through hole, the buffer portion is provided in the annular groove, an annular convex portion is formed on the outer periphery of the annular groove, and the height of the annular convex portion is smaller than the height of the buffer portion.

4. The pressure-bearing connection structure according to claim 2, characterized in that: The buffer portion includes a plurality of buffer ribs spaced apart along the circumferential direction, wherein the buffer ribs are triangular in shape in the circumferential direction and have a uniform radial thickness.

5. The pressure-bearing connection structure according to any one of claims 2 to 4, characterized in that: The first substrate is a metal part, and the second substrate is an integrally injection-molded plastic part.

6. The pressure-bearing connection structure according to claim 1, characterized in that: The pressure bearing member is provided with a notch which connects the first end surface to the second end surface.

7. The pressure-bearing connection structure according to claim 6, characterized in that: The pressure-bearing member is a metal member, and the two side surfaces of the notch are parallel to the axial direction of the fixing hole.

8. The pressure-bearing connection structure according to claim 1, characterized in that: A chamfer is provided between the outer circumferential surface of the pressure-bearing member and the first end surface; and / or a chamfer is provided between the outer circumferential surface of the pressure-bearing member and the second end surface.

9. The pressure-bearing connection structure according to any one of claims 1 to 4, characterized in that: The fixing hole is a threaded hole, and the rod portion includes a threaded portion, and the threaded portion is engaged with the threaded hole; or, the rod portion extends out of the fixing hole along the axial direction and is fixed to the inner surface of the first substrate.

10. A housing, characterized in that It comprises an upper shell and a lower shell, and a pressure-bearing connection structure as described in any one of claims 1 to 9, wherein the first substrate is fixedly connected to the lower shell or is a part of the lower shell, and the second substrate is fixedly connected to the upper shell or is a part of the upper shell.

Images