A method for preventing separation of two-piece jackets in a pivot joint and a pivot joint

Abstract

The invention relates to the field of manufacturing vibration-damping components for rail vehicles, and specifically discloses a method for preventing separation of two-flap outer shells in a swing arm node and a swing arm node, wherein a buckle structure is matched and arranged at the connection between the two-flap outer shells, and the clamping force of the buckle structure is used to balance the axial component force f generated by the reaction force of extruding rubber, which tends to separate the two-flap outer shells axially outward, thereby preventing the two-flap outer shells from separating; wherein the swing arm node comprises a core shaft, a rubber body and an outer shell, the rubber body is vulcanized between the core shaft and the outer shell, the outer shell is a two-flap paired structure comprising an outer shell 1 and an outer shell 2, and mutually matching buckle assemblies are arranged on the paired surfaces of the outer shell 1 and the outer shell 2, the buckle assembly comprises a clamping groove and a clamping block, and the outer shell 1 and the outer shell 2 are clamped by clamping the clamping block in the clamping groove.

Description

Technical Field

[0001] The invention relates to a method for preventing separation of two-petal outer sleeves in a swing arm node, which is mainly used in a primary or secondary shock absorbing system of a rail vehicle and belongs to the field of manufacturing shock absorbing components of a rail vehicle. Background Art

[0002] The swing arm node is mostly used in the bogies of light rail, subway, ordinary passenger car and high-speed EMU. It is a Class A key component of the train. It is installed in the swing arm of the axle box positioning system to transmit the traction and lateral force of the bogie. It can absorb and attenuate the vibration of the vehicle in the vertical, lateral and longitudinal directions to ensure the smooth operation of the vehicle. At the same time, it plays a role in flexible connection and axle box positioning. The swing arm node is usually made of metal and rubber vulcanization, and transmits the traction and braking force of the wheelset and the frame. At the same time, the swing arm node can also provide lateral and longitudinal stiffness, realize the lateral and longitudinal relative displacement between the wheelset and the frame, ensure the running stability and curve passability of the vehicle, and is an important suspension component in rail vehicles.

[0003] Usually, the swing arm node allows a large vertical displacement of the axle box relative to the frame, and the lateral and longitudinal relative displacement between the wheelset and the frame is achieved by the deformation of the swing arm node. Therefore, the swing arm node needs to have a large axial stiffness. In actual working conditions, in order to improve the axial stiffness of the swing arm node, it is often necessary to design Figure 1 The pivot node shown in the figure specifically includes a core shaft 1, a jacket 2, and a rubber body 3 vulcanized between the core shaft 1 and the jacket 2, wherein the middle portion of the core shaft 1 protrudes outward toward the side of the axial center line L away from the pivot node and forms an arc upper arch 4, and the arc upper arch 4 makes the distance L1 between the vertex A of the outer diameter of the core shaft 1 and the axial center line L greater than the distance L2 between the bottom point B of the inner diameter of the split-flap jacket and the axial center line L. If an integrated jacket structure is adopted, the arc upper arch 4 will affect the assembly of the jacket 2, so the jacket 2 needs to be designed as Figure 1 The two-piece structure shown includes a jacket 1 2a and a jacket 2 2b.

[0004] After the two-petal structure outer sleeve 1 2a and outer sleeve 2b are assembled, the rubber body 3 needs to be pre-compressed. There is a risk of separation between the outer sleeve 1 2a and the outer sleeve 2b under the action of the pre-compression force. Therefore, how to design a method to prevent the separation of the two-petal outer sleeves in the swing arm node and a swing arm node structure is a problem that needs to be solved urgently. Summary of the invention

[0005] The object of the present invention is to provide a method for preventing the separation of two-petal outer sleeves in a pivot arm node and a pivot arm node structure, by matching and arranging a snap-fit ​​structure at the mating surfaces of the two-petal outer sleeves to prevent the two-petal outer sleeves from separating when subjected to axial force components, thereby ensuring the stability of the pivot arm node assembly and the safety of use.

[0006] In order to achieve the above-mentioned purpose, the present invention proposes the following technical solution: a method for preventing the separation of the two-petal outer shell in the swing arm node, wherein a buckle structure is matched at the connection between the two-petal outer shell, and the clamping force of the buckle structure is used to balance the axial component force f generated by the reaction force of the extruded rubber, which tends to separate the two-petal outer shell toward the axial outside of the outer shell, thereby preventing the two-petal outer shell from separating.

[0007] Preferably, assuming that the theoretical required assembly force of the pivot node is F1, and the actual required assembly force of the pivot node is F2, then F2≥F1+2f.

[0008] Preferably, the pivot joint is pre-compressed by radial pre-compression.

[0009] Preferably, the length of one lobe of the outer sleeve of the finished arm node is set to S, that is, the total length of the two lobe outer sleeves is 2S, and the elongation of the outer sleeve after radial pre-compression of the arm node is set to ξ; the axial length of the outer sleeve iron part is set to S-ξ.

[0010] Preferably, it includes a core shaft, a rubber body and a sleeve, the rubber body is vulcanized between the core shaft and the sleeve, the sleeve is a two-piece mounting structure including a sleeve one and a sleeve two, the mounting surfaces of the sleeve one and the sleeve two are provided with mutually cooperating snap-fit ​​components, the snap-fit ​​components include a slot and a block, and the sleeve one and the sleeve two are clamped by clamping the block in the slot.

[0011] Preferably, the card slot is arranged in the middle of the mounting surface one in the sleeve one, and the card block is matched and arranged in the middle of the mounting surface two in the sleeve two; the card slot includes a stop area located on the mounting surface and a clamping area located inside the stop area; the stop area includes an entrance and exit and a stop platform, and the clamping area includes a clamping blind groove connected to the entrance and exit, and the buckle can enter the clamping blind groove from the entrance and exit and be limited by the stop platform.

[0012] Preferably, the clamping blind groove includes a bottom wall 1 parallel to the radial center line, and two side walls 1 connected to the two side ends of the bottom wall 1 and evenly distributed along the axial center line; the stop platform includes an inner wall 1 parallel to the radial center line and connected to the end of the side wall 1 away from the bottom wall 1, and an entry and exit wall 1 connected between the mounting surface 1 and the inner wall 1, and the entry and exit wall 1 is connected to the end of the inner wall 1 away from the side wall 1; an entrance and exit is formed between the two entrance and exit walls 1, the width between the two side walls 1 is H1, the width of the entrance and exit 1 is H2, and H1≥1.5H2.

[0013] Preferably, the clamping blind groove is an arcuate groove structure, including an arcuate bottom wall 2 and an arcuate side wall 2 evenly distributed at the two side ends of the bottom wall 2 along the radial center line; the stop platform is an arcuate platform structure, specifically an arcuate entry and exit wall 2 connected between the arcuate side wall 2 and the mounting surface 1; the arcuate entry and exit wall 2 protrudes toward the radial center line to form an inner stop wall connected to the arcuate side wall 2, the arcuate side wall 2 protrudes toward the side away from the radial center line, and the arcuate bottom wall 2 protrudes toward the side away from the axial center line L.

[0014] Preferably, the outer sleeve 1 and the outer sleeve 2 are mounted in a radial direction, at which time the clamping block is placed into the clamping groove along the axial direction and the outer sleeve 1 and the outer sleeve 2 are locked in the axial direction.

[0015] Preferably, the outer sleeve 1 and the outer sleeve 2 are mounted opposite each other in the axial direction, at which time the clamping block is placed into the clamping groove along the radial direction and the outer sleeve 1 and the outer sleeve 2 are locked in the radial direction.

[0016] The beneficial effects of the present invention are:

[0017] The present invention arranges the outer shell into two halves, and arranges mutually matching buckles and slots on the mating surfaces 1 and 2 of the two halves of the outer shell to lock the two halves of the outer shell. This can balance the axial component force f that tends to separate the two halves of the outer shell axially outward due to the reaction force of the pre-compressed extruded rubber, prevent the two halves of the outer shell from separating, and further ensure the stability of the working performance of the swing arm node after loading.

[0018] There are two types of mounting of the two halves of the outer sleeve in the present invention, namely radial mounting and axial mounting, so as to meet the load requirements of different working conditions and prevent the two halves of the outer sleeve from being separated.

[0019] The buckle structure in the present invention includes two forms: 1) a matching structure of a rectangular slot and a rectangular block, which has low processing difficulty and strong buckling force; 2) a matching structure of an arc slot and an arc block, which is easy to assemble and has strong versatility.

[0020] After the two halves of the outer sleeve are assembled, the rubber body in the pivot arm node is pre-compressed in a radial pre-compression manner in the present invention. The pre-compression manner can improve the uniformity of the compression of the rubber body, facilitate the operation of the operator, save the cost of iron parts, and further prevent the two halves of the outer sleeve from separating during the pressing and use process, thereby improving product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the prior art in the background technology.

[0022] Figure 2 It is a structural schematic diagram of the rotating arm node in the second embodiment.

[0023] Figure 3 It is a schematic diagram of the structure of the jacket 1 and the jacket 2 in the second embodiment during the assembly process.

[0024] Figure 4 Schematic diagram of the structure of the rotating arm node in the second embodiment (jacket 1 is not shown).

[0025] Figure 5 It is a schematic diagram of the structure of the outer sleeve 1 and the outer sleeve 2 of the rotating arm node in the second embodiment during the assembly process.

[0026] Figure 6 This is a schematic diagram of the structure of the pivot node in Example 3.

[0027] Figure 7 It is a schematic diagram of the structure of jacket 1 and jacket 2 in the third embodiment during the assembly process.

[0028] Description of reference numerals:

[0029] 1. Mandrel; 2. Outer sleeve; 2a. Outer sleeve 1; 2b. Outer sleeve 2; 3. Rubber body; 4. Arc upper arch; 5. Slot; 6. Block; 7. Inlet and outlet; 8. Stop platform; 9. Clamping blind groove; 10. Bottom wall 1; 11. Side wall 1; 12. Inner wall 1; 13. Inlet and outlet wall 1; 14. Bottom wall 2; 15. Side wall 2; 16. Inlet and outlet wall 2; 17. Inner stop wall; 18. Mounting surface 1; 19. Mounting surface 2. DETAILED DESCRIPTION

[0030] The following is combined with Figure 2-7 The present invention is further described in detail. In the figure, the direction M is the radial direction of the pivot axis 1 of the pivot node, the direction N is the axial direction of the pivot axis 1 of the pivot node, the line L is the axial centerline of the pivot axis 1 of the pivot node, and the line S is the radial centerline of the pivot axis 1 of the pivot node. Embodiment 1

[0031] A method for preventing separation of two-piece jackets in a pivot joint, such as Figure 2 or Figure 6 As shown, a buckle structure is matched and arranged at the connection between the two halves of the outer jacket 2, namely, the jacket 1 2a and the jacket 2 2b, and the clamping force of the buckle structure is used to balance the axial component force f that causes the two halves of the outer jacket 2 to separate axially outward due to the reaction force of the extruded rubber, thereby preventing the two halves of the outer jacket 2 from separating; during the processing, the arm node needs to be pre-compressed, the rubber body 3 will be compressed and squeezed, and the outer jacket 2 will also have a tendency to separate axially outward due to the reaction force of the extruded rubber, that is, there is an axial component force f. The two halves of the outer jacket 2 are locked by the buckle structure, which can avoid the two halves of the outer jacket 2 from separating due to the axial component force f, thereby ensuring the stability of the product assembly.

[0032] Assuming that the theoretical required assembly force of the pivot node is F1, and the actual required assembly force of the pivot node is F2, then F2≥F1+2f; the actual assembly force F2 is not less than the sum of the theoretical assembly force F1 and the component force 2f of the two-petal jacket 2, which can ensure the assembly force of the pivot node during assembly, further improve the stability of the two-petal jacket 2 during assembly, and prevent the two-petal jacket 2 from separating.

[0033] In this embodiment, the arm node is pre-compressed by radial pre-compression. This method is suitable for the structure and working conditions where there is no mounting gap between the mounting surfaces of the two halves of the outer sleeve 2 in this scheme. At the same time, the radial pre-compression method can improve the uniformity of the compression of the rubber body 3, facilitate the operation of the operator, and save the cost of raw material iron parts, further prevent the two halves of the outer sleeve 2 from separating during pressing and use, and improve product quality.

[0034] Suppose the length of one lobe of the outer sleeve 2 of the finished arm node is S, that is, the total length of the two lobe of the outer sleeve 2 is 2S, suppose the elongation of the outer sleeve 2 after radial pre-compression of the arm node is ξ, and the axial length of the iron part of the outer sleeve 2 is set to S-ξ; matching the length of the iron part with the elongation of the compression of the outer sleeve 2 can ensure the assembly performance of the outer sleeve 2 and further prevent the two lobe of the outer sleeve 2 from separating during the pressing process. Embodiment 2

[0035] In this embodiment, Figure 2-5 As shown, a swivel joint is designed by the method described in the first embodiment, specifically comprising a core shaft 1, a rubber body 3 and a jacket 2, wherein the rubber body 3 is vulcanized between the core shaft 1 and the jacket 2, and the jacket 2 is a two-piece mounting structure including a jacket 1 2a and a jacket 2b, wherein the jacket 1 2a includes a mounting surface 18, and the jacket 2b includes a mounting surface 2 19, and the mounting surfaces of the jacket 1 2a and the jacket 2b are provided with mutually matching buckle components, such as Figure 1 As shown, the buckle assembly includes a clamping slot 5 and a clamping block 6, and the jacket 1 2a and the jacket 2 2b are clamped by clamping the clamping block 6 in the clamping slot 5.

[0036] like Figure 2 As shown, the slot 5 is arranged in the middle of the mounting surface 18 in the outer sleeve 2a, and the clamping block 6 is matched and arranged in the middle of the mounting surface 19 in the outer sleeve 2b. The structure of the clamping block 6 is matched with the structure of the slot 5 and the buckle 6 is smaller than the slot 5 as a whole. The buckle 6 can be inserted into the slot 5 and can be clamped in the slot 5; the slot 5 includes a stop area located on the mounting surface and a clamping area located inside the stop area; the stop area includes an entrance and exit 7 and a stop platform 8, and the clamping area includes a clamping blind groove 9 connected to the entrance and exit 7. The clamping block 6 of the outer sleeve 2b is assembled from the entrance and exit 7 into the clamping blind groove 9 and is clamped in the slot 5 by the stop platform 8.

[0037] like Figure 2 and Figure 5As shown, the outer sleeve 1 2a and the outer sleeve 2b in this embodiment are mounted in the axial direction N. At this time, the clamping block 6 is placed in the clamping groove 5 along the axial direction N and the outer sleeve 1 2a and the outer sleeve 2b are locked in the axial direction N; the clamping blind groove 9 includes a bottom wall 10 parallel to the radial center line S, and two side walls 11 connected to the two side ends of the bottom wall 10 and evenly distributed along the axial center line L; the stopper 8 includes a side wall 11 parallel to the radial center line S and connected to the side wall 11 away from the bottom wall 10. The inner wall 12 at the end is connected to the entry and exit wall 13 between the mounting surface 18 and the inner wall 12, and the entry and exit wall 13 is connected to the end of the inner wall 12 away from the side wall 11; an entrance and exit 7 is formed between the two entrance and exit walls 13, the width between the two side walls 11 is H1, the width of the entrance and exit 7 is H2, H1≥1.5H2, so that the card block 6 has enough assembly space to be smoothly assembled into the card slot 5, and at the same time it can be stopped on the stop platform 8 without falling out.

[0038] Assembly steps:

[0039] Step 1: Place the mandrel 1 in the mold and fix it;

[0040] Step 2: Place the jacket 1 2a between the mandrel 1 and the mold, and then assemble the jacket 2b with the jacket 1 2a through the clamp 6. At this time, the clamp 6 is clamped in the clamping groove 5, and the jacket 1 2a and the jacket 2 2b are assembled.

[0041] Step 3: vulcanize the rubber body 3 between the core shaft 1, the outer sleeve 2a and the outer sleeve 2b to complete the vulcanization assembly of the swing arm node parts;

[0042] Step 4: After vulcanization, the arm node is radially extruded through a radial pre-compression process to improve the overall performance of the product and the fatigue life of the product. Embodiment 3

[0043] like Figure 6-7 As shown, the difference between this embodiment and the second embodiment is that the outer sleeve 1 2a and the outer sleeve 2b are matched in the radial direction M. At this time, the clamping block 6 is placed in the clamping groove 5 along the radial direction M and the outer sleeve 1 2a and the outer sleeve 2b are locked in the radial direction M; the clamping blind groove 9 in this embodiment is an arc groove structure, specifically including an arc bottom wall 2 14 and arc side walls 2 15 evenly distributed on both side ends of the bottom wall 2 14 along the radial center line S, the arc bottom wall 2 14 protrudes toward the side away from the axial center line L, and the arc side wall 2 15 protrudes toward the side away from the radial center line S; the stop platform 8 is an arc platform structure, specifically an arc entry and exit wall 2 16 connected between the arc side wall 2 15 and the matching surface 1 18; the arc entry and exit wall 2 16 protrudes toward the radial center line S to form an inner stop wall 17 connected to the arc side wall 2 15, and when the clamping block 6 is assembled into the clamping groove 5, the clamping block 6 is clamped on the inner stop wall 17.

[0044] The above embodiments are merely explanations of the present invention and are not limitations of the present invention. After reading this specification, those skilled in the art may make modifications to the embodiments of the present invention without any creative contribution as needed. However, such modifications are protected by the patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A method for preventing a two-piece outer jacket from separating in a pivot node, wherein a buckle structure is matched at a connection point between the two-piece outer jacket (2), and a clamping force of the buckle structure is used to balance a component force f generated by a reaction force of extruding the rubber, which tends to separate the two-piece outer jacket (2) toward the outside of the outer jacket (2), thereby preventing the two-piece outer jacket (2) from separating; wherein the pivot node comprises a core shaft (1), a rubber body (3) and an outer jacket (2), the rubber body (3) being vulcanized between the core shaft (1) and the outer jacket (2), the outer jacket (2) being a two-piece matching structure comprising an outer jacket 1 (2a) and an outer jacket 2 (2b), and a buckle assembly that cooperates with each other is provided on the matching surfaces of the outer jacket 1 (2a) and the outer jacket 2 (2b), the buckle assembly comprising a clamping groove (5) and a clamping block (6), and the outer jacket 1 (2a) and the outer jacket 2 (2b) are clamped by clamping the clamping block (6) in the clamping groove (5); the clamping groove (5) is provided in the outer jacket 1 (2a) and the outer jacket 2 (2b) are matched with each other. The clamping block (6) is matched and arranged in the middle of the second mounting surface (19) in the second outer sleeve (2b); the clamping slot (5) includes a stopper area located on the mounting surface and a clamping area located inside the stopper area; the stopper area includes an inlet and outlet (7) and a stopper platform (8); the clamping area includes a clamping blind groove (9) connected to the inlet and outlet (7); the clamping block (6) can enter the clamping blind groove (9) from the inlet and outlet (7) and be limited by the stopper platform (8); when When the outer sleeve 1 (2a) and the outer sleeve 2 (2b) are mounted in a radial direction M, the clamping block (6) is placed into the clamping groove (5) along the axial direction N and the outer sleeve 1 (2a) and the outer sleeve 2 (2b) are locked in the radial direction M; or when the outer sleeve 1 (2a) and the outer sleeve 2 (2b) are mounted in a radial direction N, the clamping block (6) is placed into the clamping groove (5) along the radial direction M and the outer sleeve 1 (2a) and the outer sleeve 2 (2b) are locked in the axial direction N.

2. The method for preventing separation of the two-petal jacket in the pivot joint according to claim 1, characterized in that: Assume that the theoretical required assembly force of the pivot joint is F1, and the actual required assembly force of the pivot joint is F2, then F2≥F1+2f.

3. The method for preventing separation of the two-piece jacket in the pivot joint according to claim 2, characterized in that: When the outer sleeve 1 (2a) and the outer sleeve 2 (2b) are mounted in the axial direction N, the joint of the rotating arm is pre-compressed by radial pre-compression.

4. The method for preventing separation of the two-piece jacket in the pivot joint according to claim 3, characterized in that: When the first outer sleeve (2a) and the second outer sleeve (2b) are mounted in the axial direction N, the length of one outer sleeve (2) of the finished arm node is assumed to be S, that is, the total length of the two outer sleeves (2) is assumed to be 2S, and the elongation of the outer sleeve (2) after radial pre-compression of the arm node is assumed to be ξ; the axial length N of the iron part of the outer sleeve (2) is assumed to be S-ξ.

5. A boom node, designed by the method according to any one of claims 1 to 4, characterized in that: When the outer sleeve 1 (2a) and the outer sleeve 2 (2b) are mounted in the axial direction N, the clamping blind groove (9) includes a bottom wall 1 (10) parallel to the radial center line S, and two side walls 1 (11) connected to the two side ends of the bottom wall 1 (10) and evenly distributed along the axial center line L; the stop platform (8) includes an inner wall 1 (12) parallel to the radial center line S and connected to an end of the side wall 1 (11) away from the bottom wall 1 (10), and an inlet and outlet wall 1 (13) connected between the mounting surface 1 (18) and the inner wall 1 (12), and the inlet and outlet wall 1 (13) is connected to an end of the inner wall 1 (12) away from the side wall 1 (11); an inlet and outlet (7) is formed between the two inlet and outlet walls 1 (13), the width between the two side walls 1 (11) is H1, and the width of the inlet and outlet (7) is H2, and H1≥1.5H2.

6. A boom node, designed by the method according to any one of claims 1 to 2, characterized in that: When the outer sleeve 1 (2a) and the outer sleeve 2 (2b) are mounted in the radial direction M, the clamping blind groove (9) is an arcuate groove structure, comprising an arcuate bottom wall 2 (14) and arcuate side walls 2 (15) uniformly distributed on both side ends of the bottom wall 2 (14) along the radial center line S; the stop platform (8) is an arcuate platform structure, specifically an arcuate entry and exit wall 2 (16) connected between the arcuate side wall 2 (15) and the mounting surface 1 (18); the arcuate entry and exit wall 2 (16) protrudes toward the radial center line S to form an inner stop wall (17) connected to the arcuate side wall 2 (15); the arcuate side wall 2 (15) protrudes toward the side away from the radial center line S, and the arcuate bottom wall 2 (14) protrudes toward the side away from the axial center line L.

Images