Rivet pulling assembly, rivet pulling method, middle cylinder connecting structure and electric control shock absorber

Abstract

The invention provides a rivet pulling assembly, a rivet pulling method, a middle cylinder connecting structure and an electric control shock absorber. The rivet pulling assembly comprises a positioning seat, a riveting block and a drawing piece. The positioning seat comprises a positioning surface matched with the outer side surface of the wall body and a cavity sunken in the positioning surface, a drawing hole is formed in the bottom wall of the cavity, a limiting surface is formed on the bottom wall of the cavity, the maximum size of an inner ring of the limiting surface is smaller than the diameter of the through hole, and the minimum size of an outer ring of the limiting surface is larger than or equal to the diameter of the through hole; the riveting block comprises a matching part and a stress hole; the drawing piece is connected to the stress hole, and at least part of the drawing piece is located in the drawing hole so that drawing operation can be conducted on the drawing piece. Wherein the material hardness of the riveting block is lower than the material hardness of the positioning seat, the drawing piece and the middle cylinder, the drawing piece is configured to be capable of extruding the riveting block to deform to form interference fit with the through hole when drawing the riveting block, and part of the material extruding the riveting block flows into the cavity, so that the problems that an existing middle cylinder connecting structure is large in machining process difficulty and low in machining cost can be solved. And the production cost is high.

Description

Technical Field

[0001] The invention relates to the technical field of shock absorbers, and in particular to a riveting assembly, a riveting method, an intermediate cylinder connection structure and an electronically controlled shock absorber. Background Art

[0002] Electronically controlled shock absorbers can adjust the damping by changing the throttle opening through the solenoid valve, thereby achieving "soft" or "hard" adjustment of the suspension. Therefore, with the popularization of new energy vehicles and the application of autonomous driving technology, the demand for electronically controlled shock absorbers is increasing.

[0003] The existing electronically controlled shock absorbers are divided into two types: solenoid valve external and intelligent valve internal. In the solenoid valve external structure, the intermediate cylinder is indispensable. The solenoid valve and the intermediate cylinder need to be connected through a link ring, so that when the solenoid valve is turned on, the oil flows from the inner cavity of the intermediate cylinder to the outer cavity of the intermediate cylinder. When the solenoid valve is closed, the flow transfer is blocked.

[0004] At present, there are generally two ways to connect the intermediate cylinder and the link ring. One is to make a hole on the surface of the intermediate cylinder, insert the link ring into the inner side of the flanged hole of the intermediate cylinder and seal it with an O-ring, and the upper end is pressed by a solenoid valve. The other is to stamp a plane on the surface of the intermediate cylinder, press the upper end of the link ring with a solenoid valve to make it pressed against the stamping surface of the intermediate cylinder, and seal the lower end of the link ring with the intermediate cylinder by an O-ring. These two methods are difficult to process and have high production costs. Summary of the invention

[0005] In view of the above shortcomings of the prior art, the present invention provides a rivet assembly, a rivet method, an intermediate cylinder connection structure and an electronically controlled shock absorber to improve the technical problems of the existing intermediate cylinder connection structure, such as the difficulty of processing technology and the high production cost.

[0006] To achieve the above-mentioned purpose and other related purposes, the present invention provides a rivet assembly, including a positioning seat, a rivet block and a drawing piece; the positioning seat includes a positioning surface adapted to the outer side surface of the wall body and a cavity recessed on the positioning surface, a through drawing hole is arranged on the bottom wall of the cavity, and an annular limiting surface is formed on the bottom wall of the cavity, the maximum size of the inner ring of the limiting surface is smaller than the diameter of the through hole, and the minimum size of the outer ring of the limiting surface is greater than or equal to the diameter of the through hole; the rivet block includes a matching portion and a force-bearing hole that can be matched with the through hole gap; the drawing piece is connected to the force-bearing hole and is at least partially located in the drawing hole to perform a drawing operation on the drawing piece; wherein the material hardness of the rivet block is lower than the material hardness of the positioning seat, the drawing piece and the intermediate cylinder, and the drawing piece is configured to be able to extrude the rivet block to deform and form an interference fit with the through hole when pulling the rivet block, and extrude part of the material of the rivet block into the cavity to form the intermediate cylinder connection structure.

[0007] In an example of the rivet assembly of the present invention, the positioning seat is arranged around the outer circumference of the intermediate cylinder and at least partially abuts against the wall to fix the intermediate cylinder.

[0008] In an example of the rivet assembly of the present invention, the positioning seat is arranged to be openable and closable along the radial direction of the intermediate cylinder.

[0009] In an example of the rivet assembly of the present invention, the cavity is configured as a circular depression, and the diameter of the cavity is greater than the diameter of the through hole.

[0010] In an example of the rivet assembly of the present invention, the pulling piece passes through the rivet block, and the pulling piece includes a pulling portion and an extrusion portion. The pulling portion protrudes from the rivet block and is located in the pulling hole. The extrusion portion includes a conical portion and a cylindrical portion. The conical portion is adapted to the force-bearing hole, and the diameter of the cylindrical portion is larger than the diameter of the large end of the conical portion and smaller than the diameter of the through hole.

[0011] In an example of the rivet assembly of the present invention, the drawing piece, the rivet block and the cavity are all coaxially arranged.

[0012] The present invention further provides a riveting method, which uses any of the above-mentioned riveting assemblies to process the intermediate cylinder connection structure, and the riveting method comprises the following steps:

[0013] The riveting block and the drawing piece are installed in cooperation with the through hole, the cooperation portion is in gap cooperation with the through hole, and one end of the riveting block protrudes outward from the wall body;

[0014] Positioning the intermediate cylinder, fitting the intermediate cylinder to the positioning surface, one end of the riveting block protruding from the outer side of the wall body abuts against the limiting surface, and along the axial projection of the through hole, the projection of the limiting surface covers the contour line of the through hole;

[0015] The drawing piece is pulled, and when the drawing piece is pulled, the matching portion is squeezed to deform and form an interference fit with the through hole, and the portion of the riveting block protruding from the middle cylinder is squeezed to deform and flow into the cavity.

[0016] The present invention also provides an intermediate cylinder connection structure, which is formed by adopting the above-mentioned riveting method to process the rivet assembly described in any one of the above-mentioned items, and the intermediate cylinder connection structure includes a mating section, a connecting section and a mating hole; the mating section is interference fit with the through hole; the connecting section and the mating portion are integrally formed and protrude from the wall; the mating hole passes through the mating section and the connecting section.

[0017] In an example of the rivet assembly of the present invention, the cross-section of the connecting section is circular, and the diameter of the connecting section is larger than the diameter of the through hole.

[0018] The present invention also provides an electronically controlled shock absorber, comprising the intermediate cylinder connection structure described in any one of the above items, wherein one end of the intermediate cylinder connection structure away from the intermediate cylinder is sealedly connected to a link ring, and one end of the link ring away from the intermediate cylinder is connected to a solenoid valve.

[0019] The rivet assembly of the present invention can form an intermediate cylinder connection structure on the through hole of the wall of the intermediate cylinder by drawing. The rivet assembly includes a positioning seat, a rivet block and a drawing piece. The positioning seat plays a role in positioning the intermediate cylinder and constructing a cavity. The material hardness of the rivet block is lower than the material hardness of the positioning seat and the material hardness of the drawing piece, so that the rivet block can be deformed under the joint action of the drawing piece and the cavity. Since the maximum size of the inner ring of the limiting surface is smaller than the diameter of the through hole, and since the matching portion of the rivet block can match with the clearance of the through hole, the limiting surface can limit the axial flow of the rivet block when the drawing piece draws the rivet block, so that it can only flow radially, and finally the rivet block is deformed to form an interference fit with the through hole, and part of the material of the rivet block is squeezed into the cavity to form the intermediate cylinder connection structure.

[0020] The intermediate cylinder connection structure is formed by deformation of the riveting block, and is fixed and sealed with the intermediate cylinder by interference fit with the through hole and the wall. Compared with the two methods of turning holes on the surface of the intermediate cylinder and punching planes on the surface of the intermediate cylinder in the prior art, this technical solution reduces the processing difficulty and production cost. In addition, the link ring in this technical solution is connected to the intermediate cylinder through the intermediate cylinder connection structure, replacing the method of directly connecting to the intermediate cylinder in the prior art, which can weaken the pressing force from the solenoid valve on the intermediate cylinder and improve the technical problem of the displacement of the intermediate cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0022] Figure 1 It is a schematic diagram of the combination of an intermediate cylinder and a rivet assembly according to an embodiment of the present invention;

[0023] Figure 2 for Figure 1 AA section view;

[0024] Figure 3 Before the riveting process begins Figure 1 BB cross-sectional view;

[0025] Figure 4 for Figure 3A partial enlarged view of point C in the middle;

[0026] Figure 5 After the riveting process is completed Figure 1 BB cross-sectional view;

[0027] Figure 6 for Figure 5 A partial enlarged view of point D in the middle;

[0028] Figure 7 It is a combined schematic diagram of an embodiment of the intermediate cylinder and the intermediate cylinder connection structure of the present invention;

[0029] Figure 8 for Figure 7 A partial enlarged view of point E in the middle;

[0030] Fig. 9 It is a structural schematic diagram of an embodiment of an electronically controlled shock absorber of the present invention;

[0031] Fig.10 for Fig. 9 A partial enlarged view of point F in the middle.

[0032] Component number description

[0033] 10. Electric shock absorber; 100. Rivet assembly; 110. Positioning seat; 111. Positioning surface; 112. Cavity; 1121. Limiting surface; 113. Drawing hole; 120. Riveting block; 121. Matching part; 122. Force hole; 130. Drawing piece; 131. Drawing part; 132. Extrusion part; 1321. Conical part; 1322. Cylindrical part; 200. Intermediate cylinder; 210. Wall; 220. Through hole; 300. Intermediate cylinder connection structure; 310. Matching section; 320. Connecting section; 330. Matching hole; 400. Linking ring; 500. Solenoid valve. DETAILED DESCRIPTION

[0034] The following is an explanation of the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the features in the following embodiments and the embodiments can be combined with each other without conflict. It should also be understood that the terms used in the embodiments of the present invention are intended to describe specific embodiments, rather than to limit the scope of protection of the present invention. The test methods for which specific conditions are not specified in the following examples are usually carried out under conventional conditions or according to the conditions recommended by the manufacturers.

[0035] When numerical ranges are given in the embodiments, it should be understood that, unless otherwise specified in the present invention, both endpoints of each numerical range and any value between the two endpoints can be selected. Unless otherwise defined, all technical and scientific terms used in the present invention are familiar to those skilled in the art and the description of the present invention, and any methods, equipment and materials of the prior art similar or equivalent to the methods, equipment and materials described in the embodiments of the present invention can also be used to implement the present invention.

[0036] It should be noted that the terms such as "upper", "lower", "left", "right", "middle" and "one" etc. used in this specification are only for the convenience of description and are not intended to limit the scope of implementation of the present invention. Changes or adjustments to their relative relationships, without substantially changing the technical content, should also be regarded as the scope of implementation of the present invention.

[0037] See also Figures 1 to 10 The present invention provides a rivet assembly 100, a rivet method, an intermediate cylinder connection structure 300 and an electronically controlled shock absorber 10. The rivet assembly 100 is processed into the intermediate cylinder connection structure 300 by adopting the above-mentioned rivet method. In the technical solution, the link ring 400 is connected to the intermediate cylinder 200 through the intermediate cylinder connection structure 300, replacing the method of directly connecting to the intermediate cylinder 200 in the prior art. The processing difficulty and production cost of the intermediate cylinder connection structure 300 can be reduced, and the pressing force from the solenoid valve 500 on the intermediate cylinder 200 can be weakened, thereby improving the technical problem of the displacement of the intermediate cylinder 200.

[0038] See also Figures 1 to 3 The present invention provides a rivet assembly 100, including a positioning seat 110, a rivet block 120 and a drawing piece 130; the positioning seat 110 plays the role of positioning the intermediate cylinder 200 and constructing the cavity 112, the rivet block 120 is clearance-matched with the through hole 220 of the wall 210 of the intermediate cylinder 200, and is deformed under the joint action of the drawing piece 130 and the cavity 112 to form an intermediate cylinder connection structure 300 that is interference-fitted with the through hole 220. Compared with the two methods of turning a hole on the surface of the intermediate cylinder 200 and stamping a plane on the surface of the intermediate cylinder 200 in the prior art, this technical solution reduces the processing difficulty and production cost.

[0039] See also Figure 3 to Figure 4 The positioning seat 110 includes a positioning surface 111 adapted to the outer side surface of the wall body 210. The shape of the positioning seat 110 is not limited. It can be a structure surrounding the intermediate cylinder 200 to fix the entire periphery of the intermediate cylinder 200, or it can be a structure fixed to only part of the periphery of the intermediate cylinder 200. The number of positioning surfaces 111 is not limited, and one or more positioning surfaces can be set. When one positioning surface 111 is set, the entire surface of the positioning seat 110 close to the intermediate cylinder 200 can be positioned in coordination with the intermediate cylinder 200.

[0040] See also Figure 3 to Figure 4 A cavity 112 is recessed on the positioning surface 111. The structure of the cavity 112 is not limited and can be a square recess, a circular recess, a polygonal recess or a recess of other irregular shapes. A through drawing hole 113 is provided on the bottom wall of the cavity 112. The shape of the drawing hole 113 is not limited and can be a square hole, a circular hole, a polygonal hole or a hole of other irregular shapes. A ring-shaped limiting surface 1121 is formed on the bottom wall of the cavity 112. The shape of the limiting surface 1121 can be various. The shape of the outer edge of the limiting surface 1121 is consistent with the shape of the cavity 112. The inner edge of the limiting surface 1121 is in the same shape as the drawing hole 113. Considering that the limiting surface 1121 needs to be able to limit the axial movement of the riveting block 120, the maximum size of the inner ring of the limiting surface 1121 is smaller than the diameter of the through hole 220, and the minimum size of the outer ring of the limiting surface 1121 is greater than or equal to the diameter of the through hole 220. It should be noted that the maximum size of the inner ring of the limiting surface 1121 refers to the distance between the two farthest points on the inner ring, and the minimum size of the outer ring of the limiting surface 1121 refers to the distance between the two closest points on the outer ring. Under the limiting effect of the limiting surface 1121, the material of the riveting block 120 only flows radially during the drawing process.

[0041] See also Figure 3 to Figure 4 The rivet block 120 includes a fitting portion 121 that can be clearance-fitted with the through hole 220. The clearance-fitting setting makes it easy for the rivet block 120 to pass through the through hole 220. At the same time, only a slight deformation is required to change the clearance fit into an interference fit, saving time and material costs. The rivet block 120 also includes a force-bearing hole 122. The shape of the force-bearing hole 122 is not limited and can be a conical hole, a circular hole, a square hole, a circular hole, other irregularly shaped holes or a combination of multiple shapes, as long as it can be fitted with the drawing piece 130 to complete the drawing operation.

[0042] See also Figure 3 to Figure 4 The pulling piece 130 is connected to the force-bearing hole 122 , the rivet block 120 and the pulling piece 130 may be fixed or not, the pulling piece 130 may pass through the rivet block 120 or may not pass through the rivet block 120 , as long as the pulling piece 130 is partially located in the pulling hole 113 , so as to facilitate the pulling operation of the pulling piece 130 .

[0043] For further information, see Figures 3 to 6Considering that the rivet block 120 can be deformed under the joint action of the drawing piece 130 and the cavity 112 to form the intermediate cylinder connection structure 300, the material hardness of the rivet block 120 is lower than the material hardness of the positioning seat 110, the drawing piece 130 and the intermediate cylinder 200. The material of the intermediate cylinder 200 can be carbon steel, stainless steel, alloy steel or seamless steel pipe, etc. In this embodiment, the material of the intermediate cylinder is E355 steel, the material of the drawing piece 130 can be carbon steel or stainless steel, etc., the material of the positioning seat 110 can be cast iron, carbon steel or alloy steel, etc., and the material of the rivet block 120 can be aluminum or copper, etc., without limitation.

[0044] See also Figure 3 to Figure 4 and Figures 9 and 10 The pulling member 130 is configured to extrude the rivet block 120 to deform and form an interference fit with the through hole 220 when pulling the rivet block 120, and extrude part of the material of the rivet block 120 into the cavity 112 to form the intermediate cylinder connection structure 300. The intermediate cylinder connection structure 300 is formed by the deformation of the rivet block 120, and is fixed and sealed with the intermediate cylinder 200 through interference fit with the through hole 220 and the wall body 210. Compared with the two methods of turning a hole on the surface of the intermediate cylinder 200 and stamping a plane on the surface of the intermediate cylinder 200 in the prior art, this technical solution reduces the processing difficulty and production cost. In addition, in the present technical solution, the link ring 400 is connected to the intermediate cylinder 200 through the intermediate cylinder connection structure 300, replacing the method of directly connecting to the intermediate cylinder 200 in the prior art. The lateral force generated by the compression of the link ring 400 is mainly borne by the contact surface between the rivet block 120 and the link ring 400, which can weaken the compression force of the solenoid valve 500 on the intermediate cylinder 200 and improve the technical problem of the displacement of the intermediate cylinder 200. In addition, the sealing performance of the link ring 400 and the intermediate cylinder 200 is improved, and the oil inside and outside the intermediate cylinder 200 only circulates through the solenoid valve 500, thereby achieving the adjustability of the damping force.

[0045] Considering that the intermediate cylinder 200 can be better positioned and fixed when the riveting block 120 is pulled, in an example of the riveting assembly 100 of the present invention, refer to Figures 1 to 4The positioning seat 110 is arranged around the outer circumference of the intermediate cylinder 200, and at least partially abuts against the wall body 210 to fix the intermediate cylinder 200. The portion abutting against the wall body 210 is the positioning surface 111. It should be noted that the number of positioning surfaces 111 is not limited, and one or more positioning surfaces 111 can be set. When one positioning surface 111 is set, the entire surface of the positioning seat 110 close to the intermediate cylinder 200 can be used as the positioning surface 111 to cooperate with the intermediate cylinder 200 for positioning. In this embodiment, a positioning hole adapted to the intermediate cylinder 200 is provided on the positioning seat 110. The positioning hole is the positioning surface 111 that fits against the outer side of the wall body 210 of the intermediate cylinder 200. This setting can fix the intermediate cylinder 200 more stably, and can improve the accuracy of the relative position relationship between the positioning hole and the cavity 112, thereby improving the accuracy of the relative position relationship between the intermediate cylinder connecting structure 300 and the intermediate cylinder 200.

[0046] In order to facilitate the removal of the processed intermediate cylinder 200, in an example of the rivet assembly 100 of the present invention, refer to Figures 1 to 4 The positioning seat 110 is arranged to be openable and closable along the radial direction of the intermediate cylinder 200. The opening and closing method of the positioning seat 110 is not limited, and the opening and closing position is not limited, as long as the positioning seat 110 can be opened along the radial direction of the intermediate cylinder 200. In this embodiment, the positioning seat 110 is divided into two parts that can be opened and closed along the axis of the cavity 112. This arrangement facilitates the processing of the positioning seat 110, and is conducive to the processing of the cavity 112 and the positioning hole, as well as the measurement of the size and accuracy, which can improve the processing accuracy of the positioning seat 110, and further improve the matching accuracy of the intermediate cylinder connection structure 300 and the intermediate cylinder 200.

[0047] See also Figures 2 to 4 In an example of the rivet assembly 100 of the present invention, the cavity 112 is configured as a circular depression. The circular configuration is convenient for processing, has no stress concentration defects and has good versatility. Furthermore, the diameter of the cavity 112 is greater than the diameter of the through hole 220. On the one hand, this configuration increases the contact end surface area between the connecting mechanism and the link ring 400, reduces the occurrence of extrusion deformation, and ensures the coaxiality of the internal clamping components, thereby reducing various problems caused by centering. On the other hand, the diameter of the portion of the intermediate cylinder connecting structure 300 protruding from the intermediate cylinder 200 is greater than the diameter of the through hole 220, and interference compression can be achieved between the intermediate cylinder connecting structure 300 and the wall body 210, further improving the reliability, stability and sealing performance of the fixed connection between the intermediate cylinder connecting structure 300 and the intermediate cylinder 200.

[0048] See also Figures 2 to 4In an example of the rivet assembly 100 of the present invention, the drawing member 130 passes through the rivet block 120, and the drawing member 130 includes a drawing portion 131 and an extrusion portion 132. The drawing portion 131 protrudes from the rivet block 120 and is located in the drawing hole 113 to achieve the effect of convenient drawing. The extrusion portion 132 includes a cone portion 1321 and a cylindrical portion 1322. The cone portion 1321 is adapted to the force-bearing hole 122, that is, the force-bearing hole 122 is a cone hole. This setting can make the rivet block 120 have a larger deformation margin within a limited height. The diameter of the cylindrical portion 1322 is larger than the diameter of the large end of the cone portion 1321, so as to extrude the force-bearing hole 122 into a cylindrical hole with a larger diameter. The diameter of the cylindrical portion 1322 is smaller than the diameter of the through hole 220, so that the matching portion 121 has a certain wall thickness. The size of the cylindrical portion 1322 determines the size of the hole in the intermediate cylinder connection structure 300 that matches the outer wall of the link ring 400, so the size of the cylindrical portion 1322 must be compatible with the outer wall of the link ring 400. The higher the precision of the cylindricality of the cylindrical portion 1322, the higher the coaxiality of the link ring 400 and the connection mechanism, and thus the better the sealing effect between the link ring 400 and the connection mechanism. In some embodiments, after the riveting process is completed, the intermediate cylinder connection structure 300 meets the precision requirements and can be directly assembled with the link ring 400; in other embodiments, after the riveting process is completed, the important dimensions of the intermediate cylinder connection structure 300 are cut to ensure the sealing of the fit.

[0049] See also Figure 3 to Figure 4 In an example of the rivet assembly 100 of the present invention, the pulling piece 130, the rivet block 120, and the cavity 112 are all coaxially matched. This arrangement improves the assembly accuracy between the mating surfaces of the intermediate cylinder connection structure 300 and the link ring 400, which improves the sealing performance on the one hand, and improves the orderly assembly between the components of the intermediate cylinder 200 on the other hand, thereby improving the qualified rate of the product.

[0050] See also Figures 1 to 6 The present invention further provides a riveting method, using any of the riveting assemblies 100 described above to process the intermediate cylinder connection structure 300, the riveting method comprising the following steps:

[0051] See also Figures 2 to 4 , the rivet block 120 and the drawing piece 130 are installed in cooperation with the through hole 220, the cooperation portion 121 is clearance-fitted with the through hole 220, the clearance-fitting setting makes it easy for the rivet block 120 to pass through the through hole 220, and only a slight deformation is required to change the clearance fit into an interference fit, saving time and material costs, and one end of the rivet block 120 protrudes from the outside of the wall body 210;

[0052] See also Figures 2 to 4 , positioning the intermediate cylinder 200, making the intermediate cylinder 200 fit the positioning surface 111, the end of the riveting block 120 protruding from the outer side of the wall body 210 abuts against the limiting surface 1121, and along the axial projection of the through hole 220, the projection of the limiting surface 1121 covers the contour line of the through hole 220. Under the limiting effect of the limiting surface 1121, the material of the riveting block 120 only flows radially during the drawing process;

[0053] See also Figure 5 to Figure 6 , pulling the drawing piece 130, when the drawing piece 130 is pulled, the matching portion 121 is squeezed to deform, and an interference fit is formed with the through hole 220, and the part of the rivet block 120 protruding from the intermediate cylinder 200 is squeezed to deform and flow into the cavity 112 to form the intermediate cylinder connection structure 300, which is formed by the deformation of the rivet block 120, and is fixed and sealed with the intermediate cylinder 200 through the interference fit with the through hole 220 and the wall body 210. Compared with the two methods of turning a hole on the surface of the intermediate cylinder 200 and stamping a plane on the surface of the intermediate cylinder 200 in the prior art, this technical solution reduces the difficulty of processing and production costs.

[0054] See also Figures 5 to 8 The present invention also provides an intermediate cylinder connection structure 300, which is processed by the above-mentioned rivet assembly 100 by adopting the above-mentioned riveting method. The intermediate cylinder connection structure 300 includes a matching section 310, a connecting section 320 and a matching hole 330; the matching section 310 is interference fit with the through hole 220; and a fixed and sealed connection between the intermediate cylinder connection structure 300 and the intermediate cylinder 200 is achieved. The connecting section 320 is integrally formed with the mating section 310 and protrudes from the wall body 210. The connecting section 320 is used for connection with the link ring 400. The mating hole 330 passes through the mating section 310 and the connecting section 320. The mating hole 330 is the mating surface between the intermediate cylinder connection structure 300 and the link ring 400. The size of the cylindrical portion 1322 determines the size of the mating hole 330, so the size of the cylindrical portion 1322 must be compatible with the outer wall of the link ring 400. The higher the accuracy of the cylindricity of the cylindrical portion 1322, the higher the accuracy of the cylindricity of the mating hole 330, the higher the coaxiality of the link ring 400 and the connection mechanism, and thus the better the sealing effect between the link ring 400 and the connection mechanism. In some embodiments, after the riveting process is completed, the matching hole 330 can meet the accuracy requirements of size and shape and position tolerances and can be directly assembled with the connecting ring 400; in other embodiments, after the riveting process is completed, important dimensions such as the matching hole 330 and the connecting section 320 are cut to ensure the sealing of the fit.

[0055] See also Figures 5 to 8 The intermediate cylinder connection structure 300 is formed by deformation of the riveting block 120. Compared with the two methods of turning holes on the surface of the intermediate cylinder 200 and punching planes on the surface of the intermediate cylinder 200 in the prior art, this technical solution reduces the processing difficulty and production cost. In addition, the link ring 400 in this technical solution is connected to the intermediate cylinder 200 through the intermediate cylinder connection structure 300, replacing the method of directly connecting to the intermediate cylinder 200 in the prior art. The lateral force generated by the compression of the link ring 400 is mainly borne by the contact surface of the riveting block 120 and the link ring 400, which can weaken the compression force of the electromagnetic valve 500 on the intermediate cylinder 200 and improve the technical problem of the displacement of the intermediate cylinder 200. In addition, the sealing performance of the link ring 400 and the intermediate cylinder 200 is improved, and the oil inside and outside the intermediate cylinder 200 only circulates through the electromagnetic valve 500, so as to achieve the adjustability of the damping force.

[0056] See also Figures 9 and 10 When the link ring 400 is assembled with the intermediate cylinder connection structure 300, the lower end of the link ring 400 is inserted into the matching hole 330, and the step surface of the link ring 400 matches with the upper end surface of the connection section 320. Considering that the end surface size of the intermediate cylinder connection structure 300 obtained by surface turning and the step surface of the link ring 400 matched with each other in the prior art is small, it is easy to deform when subjected to the pressing force of the electromagnetic valve 500, and it is difficult to align, which reduces the assembly efficiency. In an example of the rivet assembly 100 of the present invention, the cross section of the connection section 320 is circular, and the circular setting is easy to process, has no stress concentration defects, and has good versatility. The diameter of the connecting section 320 is greater than the diameter of the through hole 220. This arrangement increases the area of ​​the upper end surface of the connecting section 320, which can alleviate the problem of deformation when subjected to the clamping force of the solenoid valve 500. In addition, since the connecting section 320 protrudes radially from the through hole 220, the riveting process can achieve interference compression between the connecting section 320 and the wall body 210, further improving the reliability of fixation and sealing between the intermediate cylinder connection structure 300 and the intermediate cylinder 200.

[0057] See also Figures 9 and 10The present invention also provides an electronically controlled shock absorber 10, comprising the intermediate cylinder connection structure 300 described in any one of the above items, wherein the intermediate cylinder connection structure 300 is sealedly connected to a link ring 400 at one end away from the intermediate cylinder 200, and the link ring 400 is connected to a solenoid valve 500 at one end away from the intermediate cylinder 200. The specific structure of the electronically controlled shock absorber 10 can refer to the structure in the prior art. In this embodiment, by adopting the intermediate cylinder connection structure 300 described in any one of the above items, the connection method between the link ring 400 and the intermediate cylinder 200 is changed. The link ring 400 is connected to the intermediate cylinder 200 through the intermediate cylinder connection structure 300, replacing the method of directly connecting to the intermediate cylinder 200 in the prior art. The lateral force generated by the compression of the link ring 400 is mainly borne by the contact surface between the rivet block 120 and the link ring 400, which can weaken the compression force of the intermediate cylinder 200 from the solenoid valve 500 and improve the technical problem of the displacement of the intermediate cylinder 200. In addition, the sealing performance of the link ring 400 and the intermediate cylinder 200 is improved. The oil inside and outside the intermediate cylinder 200 only circulates through the solenoid valve 500, so as to achieve the adjustability of the damping force and improve the assembly efficiency and product qualification rate of the electronically controlled shock absorber 10. In addition, the intermediate cylinder connection structure 300 can be applied to the double-valve shock absorber to improve the adjustment range and response time of the damping force of the shock absorber.

[0058] The rivet assembly of the present invention can form an intermediate cylinder connection structure on the through hole of the wall of the intermediate cylinder by drawing. The intermediate cylinder connection structure is formed by deformation of the riveting block, and is fixed and sealed with the intermediate cylinder by interference fit with the through hole and the wall. Compared with the two methods of turning the hole on the surface of the intermediate cylinder and punching the plane on the surface of the intermediate cylinder in the prior art, the technical solution reduces the processing difficulty and production cost. In addition, the link ring in the technical solution is connected to the intermediate cylinder through the intermediate cylinder connection structure, replacing the method of directly connecting to the intermediate cylinder in the prior art, which can weaken the pressing force from the solenoid valve on the intermediate cylinder and improve the technical problem of the displacement of the intermediate cylinder. Therefore, the present invention effectively overcomes some practical problems in the prior art and has high utilization value and use significance. The above embodiments are only illustrative of the principles and effects of the present invention, and are not used to limit the present invention. Any person familiar with this technology can modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the relevant technical field without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A pull rivet assembly, used to form an intermediate cylinder connection structure by drawing on a through hole of a wall of an intermediate cylinder, characterized in that: include: A positioning seat, comprising a positioning surface matched with the outer side surface of the wall body and a cavity recessed on the positioning surface, a through drawing hole is arranged on the bottom wall of the cavity, an annular limiting surface is formed on the bottom wall of the cavity, the maximum size of the inner ring of the limiting surface is smaller than the diameter of the through hole, and the minimum size of the outer ring of the limiting surface is greater than or equal to the diameter of the through hole; A riveting block, comprising a matching portion capable of matching with the through hole gap and a force-bearing hole; A drawing member connected to the force-bearing hole and at least partially located in the drawing hole to perform a drawing operation on the drawing member; The material hardness of the rivet block is lower than the material hardness of the positioning seat, the pulling member and the intermediate cylinder. The pulling member is configured to squeeze the rivet block to deform and form an interference fit with the through hole when pulling the rivet block, and squeeze part of the material of the rivet block into the cavity to form the intermediate cylinder connection structure.

2. The pull rivet assembly according to claim 1, characterized in that: The positioning seat is arranged around the outer circumference of the middle cylinder and at least partially abuts against the wall to fix the middle cylinder.

3. The pull rivet assembly according to claim 2, characterized in that: The positioning seat is arranged to be openable and closable along the radial direction of the intermediate cylinder.

4. The pull rivet assembly according to claim 1, characterized in that: The mold cavity is configured as a circular depression, and the diameter of the mold cavity is greater than the diameter of the through hole.

5. The pull rivet assembly according to claim 4, characterized in that: The pulling piece passes through the rivet block, and the pulling piece includes a drawing portion and an extrusion portion. The drawing portion protrudes from the rivet block and is located in the drawing hole. The extrusion portion includes a conical portion and a cylindrical portion. The conical portion is adapted to the force-bearing hole, and the diameter of the cylindrical portion is larger than the diameter of the large end of the conical portion and smaller than the diameter of the through hole.

6. The pull rivet assembly according to claim 5, characterized in that: The drawing piece, the riveting block and the cavity are all coaxially arranged.

7. A riveting method, using the riveting assembly according to any one of claims 1 to 6 to process the intermediate cylinder connection structure, characterized in that: The following steps are involved: The riveting block and the drawing piece are installed in cooperation with the through hole, the cooperation portion is in gap cooperation with the through hole, and one end of the riveting block protrudes outward from the wall body; Positioning the intermediate cylinder, fitting the intermediate cylinder to the positioning surface, one end of the riveting block protruding from the outer side of the wall body abuts against the limiting surface, and along the axial projection of the through hole, the projection of the limiting surface covers the contour line of the through hole; The drawing piece is pulled, and when the drawing piece is pulled, the matching portion is squeezed to deform and form an interference fit with the through hole, and the portion of the riveting block protruding from the middle cylinder is squeezed to deform and flow into the cavity.

8. An intermediate cylinder connection structure, which is formed by processing the rivet assembly according to any one of claims 1 to 6 using the rivet method according to claim 7, characterized in that: include: A matching section, which is interference-fitted with the through hole; A connecting section, which is integrally formed with the matching portion and protrudes from the wall; A matching hole passes through the matching section and the connecting section.

9. The intermediate cylinder connection structure according to claim 8, characterized in that: The cross section of the connecting section is circular, and the diameter of the connecting section is larger than the diameter of the through hole.

10. An electronically controlled shock absorber, characterized in that: It comprises the intermediate cylinder connection structure according to any one of claims 8 to 9, wherein one end of the intermediate cylinder connection structure away from the intermediate cylinder is sealedly connected to a link ring, and one end of the link ring away from the intermediate cylinder is connected to a solenoid valve.

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