Composite material traction rod, bogie and railway vehicle

Abstract

The present application relates to a kind of composite material traction pull rod, bogie and railway vehicle, belong to the technical field of railway vehicle.The traction pull rod includes: composite fiber rod body, metal end and wedge block;Composite fiber rod body is four prism structure, including middle part and two end parts, end part is used to connect with metal end;Composite fiber rod body includes two groups of opposite side, first group of side is parallel to each other;The middle part of second group of side is parallel to each other, and it is set angle outward in end part, forms wedge;Metal end includes insertion slot, and the end part of composite fiber rod body is inserted into insertion slot along the direction perpendicular to the length of composite material traction pull rod, first surface is attached with the bottom surface of insertion slot;Wedge block is installed in insertion slot, wedge block is installed in the inner side surface of insertion slot along the direction from middle to end part, and composite fiber rod body is constrained in insertion slot, and the inner surface of wedge block is attached with second surface.The present application is assembled by wedge structure and other mixed connection forms to metal end of composite material traction pull rod and carbon fiber rod, avoid the problem that the connecting part is prone to peeling failure, improve the connection strength, compression resistance and tensile property.

Description

A composite material traction rod, bogie, and rail vehicle Technical Field

[0001] This invention belongs to the field of rail vehicle technology, specifically relating to a composite material traction rod, bogie, and rail vehicle. Background Technology

[0002] The information disclosed in this background section is intended only to enhance understanding of the overall background of the invention and is not necessarily to be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art.

[0003] Traction rods in railway vehicle bogies play a crucial role in transmitting traction and braking forces. Their strength and reliability are critical to train operation safety, making them a key load-bearing component. Currently, most traction rods used in railway vehicle bogies are welded metal structures, which are heavy and prone to fatigue fracture during long-term service, thus affecting their service life.

[0004] Currently, the connection strength between the metal end and the composite material rod in traction rods made of composite materials has not been effectively addressed. In the utility model patent (a composite material insulated rod) with authorization announcement number CN 206022002 U, both ends of the composite material insulating core rod are provided with external threads, which connect to the metal joint. However, the tensile and compressive strength of the external threads is poor, making it difficult to apply in the rail transit field. In the invention patent (a traction rod, bogie, and rail vehicle) with application publication number CN117125106A, the end of the composite material rod is inserted into the insertion hole of the metal joint with an interference fit. This interference fit easily leads to crushing damage to the end of the composite material rod. After crushing, the interference fit fails, causing the metal end to peel off at the connection point with the composite material rod, resulting in low connection reliability. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide a composite material traction rod, bogie, and rail vehicle, which improves the overall connection reliability of the traction rod through a wedge structure and carbon fiber winding molding process.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows:

[0007] In a first aspect, a composite material traction rod includes: a composite fiber rod body, a metal end, and a wedge-shaped block;

[0008] The composite fiber rod is a quadrangular prism structure, including a middle part and two ends, the two ends being used to connect with metal end caps; the outer surface of the quadrangular prism structure includes two sets of opposing side surfaces, the first set of side surfaces including a first surface and a second surface that are parallel to each other; the middle parts of the second set of side surfaces are parallel to each other, and flare outward at a set angle at the ends to form a wedge shape.

[0009] The metal end includes a insertion groove, and the end of the composite fiber rod is inserted into the insertion groove in a direction perpendicular to the length of the composite material traction rod, and the second set of side surfaces are in contact with the inner side surface of the insertion groove, and the first surface is in contact with the bottom surface of the insertion groove.

[0010] A wedge block is installed in the insertion groove. The wedge block is installed in the wedge block mounting groove on the inner side of the insertion groove along the direction from the middle to the end, constraining the composite fiber rod in the insertion groove. The inner surface of the wedge block is in contact with the second surface.

[0011] Optionally, the second set of sides flares outward at the ends, forming an angle of 170 to 177° with the middle part, creating an outward-expanding wedge shape.

[0012] Optionally, the two inner sides of the insertion slot have wedge-shaped block mounting slots. The cross-section of the wedge-shaped block perpendicular to the length direction of the composite material traction rod is trapezoidal, and the large base of the trapezoid fits into the second surface; the inclined side of the trapezoid fits into the inclined surface inside the wedge-shaped block mounting slot.

[0013] Optionally, the wedge block gradually tapers inward along the installation direction, and the inclined surface of the wedge block mounting groove gradually tapers inward along the wedge block installation direction.

[0014] Optionally, a carbon fiber circumferential reinforcing layer is wound around the outer side of the middle portion of the composite fiber rod. The carbon fiber circumferential reinforcing layer is flush with the outer surface of the insertion groove and with the outer surface of the wedge block.

[0015] Optionally, the metal end includes an annular portion that smoothly transitions to the outer surface of the insertion groove.

[0016] Optionally, the outer side of the annular portion is provided with a groove, the grooves of the metal end annular portions at both ends are aligned, and a longitudinal carbon fiber bearing layer is wrapped around the groove, the outer side of the insertion slot and the outer side of the carbon fiber circumferential reinforcing layer.

[0017] Optionally, the outer side of the wedge block is covered with a carbon fiber circumferential reinforcing layer along the circumferential direction perpendicular to the length of the composite material traction rod, and the circumferential reinforcing layer covers the joint between the carbon fiber circumferential reinforcing layer and the metal joint.

[0018] Optionally, the carbon fiber circumferential reinforcing layer, the carbon fiber longitudinal tensile layer, the carbon fiber circumferential strengthening layer, and the composite fiber rod are fused together with resin material.

[0019] Secondly, a bogie is provided with the composite material traction rod described in the first aspect.

[0020] Thirdly, a rail vehicle equipped with the bogies described in the second aspect.

[0021] The beneficial effects of this invention are as follows:

[0022] 1. This invention assembles the metal end of the composite traction rod with the carbon fiber rod using a hybrid connection method such as a wedge structure, avoiding the problem of easy peeling failure at the connection point and improving the connection strength. The wedge structure at the end of the composite fiber rod increases the contact area between the rod and the metal end, increasing the compressive strength of the composite traction rod. When the composite traction rod is subjected to tensile force, the tensile force can be converted into frictional force between the side of the carbon fiber rod and the metal end, thus improving the tensile strength of the composite traction rod.

[0023] 2. This invention applies a preload to the metal end through a carbon fiber tension layer, further enhancing the tensile strength of the composite traction rod. Furthermore, the wedge-shaped blocks on the side of the metal end and the circumferential carbon fiber reinforcement layer ensure that the carbon fiber rod is not easily detached from the metal end, guaranteeing overall connection reliability. This can be achieved using currently mature winding technology, ensuring product quality and production efficiency. Attached Figure Description

[0024] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0025] Figure 1 is a schematic diagram of the composite material traction rod in Example 1.

[0026] Figure 2 is a cross-sectional schematic diagram of the composite material traction rod in Example 1.

[0027] Figure 3 is a partial view of Figure 2.

[0028] Figure 4 is a cross-sectional view of the composite material traction rod in Example 1 from another direction.

[0029] Figure 5 is a schematic diagram of the carbon fiber circumferential reinforcement layer in Example 1.

[0030] Figure 6 is a schematic diagram of the carbon fiber circumferential reinforcing layer and the carbon fiber longitudinal tensile layer in Example 1.

[0031] Figure 7 is a schematic diagram of the composite material traction rod in Example 1.

[0032] Figure 8 is a schematic diagram showing the position of the wedge-shaped block mounting groove and the composite fiber rod in Example 1.

[0033] Among them, 1. Metal end; 11. Insertion groove; 12. Circular part; 13. Wedge block mounting groove; 14. Groove; 2. Longitudinal carbon fiber bearing layer; 3. Circumferential carbon fiber reinforcing layer; 4. Circumferential carbon fiber reinforcement layer; 5. Wedge block; 6. Composite fiber rod; 61. First side; 62. Second side; 63. Second set of side surfaces. Detailed Implementation

[0034] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0035] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0036] Example 1

[0037] A composite material traction rod, as shown in Figure 1, includes: a composite fiber rod body 6, a metal end 1, and a wedge block 5;

[0038] The composite fiber rod 6 has a quadrangular prism structure, including a middle part and two ends; as shown in Figure 2, the two ends are used to connect with the metal end 1; the composite fiber rod 6 includes two sets of opposing sides, the first set of sides includes a first surface 61 and a second surface 62 that are parallel to each other; as shown in Figure 3, the middle part of the second set of sides 63 is parallel to each other, and the ends flare outward, forming an outward wedge shape with the middle part at a 177° angle.

[0039] The cross-sectional position in Figure 2 is located in the middle of the second side 63 and is parallel to the length direction of the composite material traction rod. This cross-sectional position is the same as that in Figure 3.

[0040] Figure 4 shows a cross section perpendicular to the length direction of the composite material traction rod: As shown in Figure 4, the metal end 1 includes a insertion groove 11, the end of the composite fiber rod 6 is inserted into the insertion groove 11 along the direction perpendicular to the length of the composite material traction rod, and the second set of side surfaces 63 are in contact with the inner side surface of the insertion groove, and the first surface 61 is in contact with the bottom surface of the insertion groove 11.

[0041] As shown in Figure 4, a wedge block 5 is installed in the insertion groove 11. The wedge block 5 is installed in the inner side of the insertion groove 11 along the installation direction from the middle to the end, constraining the composite fiber rod 6 in the insertion groove. The inner surface of the wedge block 5 is in contact with the second surface 62.

[0042] Through the above design, the wedge-shaped structure of the second set of side surfaces 63 increases the contact area between the composite fiber rod 6 and the metal end 1, reduces the compressive stress on the contact surface, alleviates the crush damage of the composite fiber rod 6, and increases the compressive strength of the composite material traction rod. Furthermore, when the composite material traction rod is subjected to tension, it can convert the tension into friction between the second set of side surfaces 63 and the metal end 1, improving the tensile strength of the composite material traction rod. To solve the assembly problem between the composite fiber rod 6 and the metal end 1, this solution pre-cuts a wedge-shaped groove on the side of the metal end 1 and inserts a metal wedge block 5 along the axial direction after assembly. The metal wedge block 5 structurally avoids the risk of the composite fiber rod 6 detaching from the metal end 1, enhancing the connection reliability between the composite fiber rod 6 and the metal end 1.

[0043] Among them, the composite fiber rod body 6 is integrally formed by laying T 700 grade carbon fiber prepreg at 0° along the length direction. During assembly, the metal end 1 is assembled with the composite fiber rod body 6 by means of adhesive bonding and wedge connection. The hybrid connection form enhances the connection strength and avoids the problem of easy peeling failure at the connection part.

[0044] As shown in Figure 4, the two inner sides of the insertion slot 11 have wedge block mounting slots 13. The cross-section of the wedge block 5 perpendicular to the length direction of the composite material traction rod is trapezoidal. The large base of the trapezoid fits against the second surface 62. The inclined side of the trapezoid fits against the inclined surface inside the wedge block mounting slot 13 to prevent the composite fiber rod 6 from coming out.

[0045] As shown in Figure 8, the wedge block 5 gradually tapers inward along the installation direction, and the inclined surface of the wedge block mounting groove 13 gradually tapers inward along the wedge block installation direction. Thus, the trapezoidal cross-sections of the wedge block 5 and the wedge block mounting groove gradually decrease in the wedge block installation direction, and the small end of the wedge block 5 is larger than the outwardly expanding end of the composite fiber rod 6. Since the installation directions of the wedge block 5 and the composite fiber rod 6 are perpendicular to each other, the above arrangement allows the wedge block 5 to completely cover the end of the composite fiber rod 6, preventing gaps from causing bridging and affecting the wrapping effect of the outer carbon fiber material.

[0046] Among them, the material of the wedge block 5 is the same as that of the metal end 1, and has the same physical properties such as the coefficient of thermal expansion, so as to avoid the expansion of the assembly gap due to temperature and other reasons.

[0047] As shown in Figure 5 (the cross-sectional position is the same as in Figure 2), the outer side of the middle part of the composite fiber rod 6 is wrapped with a carbon fiber circumferential reinforcing layer 3. The carbon fiber circumferential reinforcing layer 3 is flush with the outer surface of the insertion groove and with the outer surface of the wedge block 5. This can prevent the wedge block 5 from coming out in the opposite direction of the installation direction and prevent gaps from affecting the wrapping effect of the outer carbon fiber material, thereby improving the compressive strength of the composite material traction rod.

[0048] Among them, the carbon fiber circumferential reinforcing layer 3 is obtained by circumferentially winding and curing T 700 grade carbon fiber bundles mixed with resin along the composite fiber rod 6.

[0049] As shown in Figure 5, the metal end 1 includes an annular portion 12, which smoothly transitions to the outer surface of the insertion groove 11.

[0050] As shown in Figure 4, a circumferentially arranged groove 14 is provided on the outer side of the annular part 12. The grooves 14 of the annular parts of the metal ends 1 at both ends are aligned, as shown in Figure 6 (the cross-sectional position is the same as in Figure 2). A carbon fiber longitudinal tensile layer 2 is wrapped around the groove 14, the outer side of the insertion groove 11 and the outer side of the carbon fiber circumferential reinforcing layer 3. The fiber direction of the longitudinal tensile layer 2 is consistent with the winding direction and is consistent with the force direction of the outer surface of the composite material traction rod, which can effectively enhance the tensile strength of the traction rod.

[0051] Among them, the longitudinal tensile layer 2 is obtained by coating and curing T 700 grade carbon fiber tow mixed resin along the winding direction.

[0052] As shown in Figure 6, on the outer side of the wedge block 5, a carbon fiber circumferential reinforcement layer 4 is wrapped around the circumferential reinforcement layer 4 along the direction perpendicular to the length of the composite material traction rod. The circumferential reinforcement layer 4 covers the joint between the carbon fiber circumferential reinforcement layer 3 and the metal joint 1, further strengthening the weak links in the entire structure.

[0053] Among them, the circumferential reinforcing layer 4 is obtained by coating and curing T700 grade carbon fiber tow mixed resin along the winding direction.

[0054] The resins of the carbon fiber circumferential reinforcing layer 4, the carbon fiber longitudinal tensile layer 2, the carbon fiber circumferential reinforcing layer 3, and the composite fiber rod 6 are all hot-melt resins with the same composition, so the resin materials of the carbon fiber circumferential reinforcing layer 4, the carbon fiber longitudinal tensile layer 2, the carbon fiber circumferential reinforcing layer 3, and the composite fiber rod 6 are fused together.

[0055] The installation method of the above-mentioned composite material traction rod includes the following steps:

[0056] S1. As shown in Figure 4, the wedge-shaped end of the composite fiber rod 6 is coated with adhesive and inserted into the insertion slots of the two metal ends 1 according to the insertion direction, with the insertion direction perpendicular to the first surface 61 and the second surface 62.

[0057] S2. As shown in Figure 4, the wedge block 5 is installed in the wedge block mounting groove 13, with the installation direction parallel to the length direction of the composite material traction rod.

[0058] S3. As shown in Figure 5, a carbon fiber circumferential reinforcing layer 3 is wrapped around the outer side of the middle part of the composite fiber rod 6 until the carbon fiber circumferential reinforcing layer 3 is flush with the outer surface of the insertion groove 11 and the outer surface of the wedge block 5, and then heated and cured.

[0059] S4. As shown in Figure 6, carbon fiber longitudinal tensile layer 2 is wrapped around the outer side of the outer groove 14 of the circular part, the outer side of the insertion groove 11 and the outer side of the carbon fiber circumferential reinforcing layer 3, and then heated and cured.

[0060] S5. As shown in Figure 6, a carbon fiber circumferential reinforcing layer 4 is wrapped around the outside of the wedge block 5 in a circumferential direction perpendicular to the length of the composite material traction rod. The circumferential reinforcing layer 4 covers the joint between the carbon fiber circumferential reinforcing layer 3 and the metal joint 1. The product is obtained by heating and curing.

[0061] Example 2

[0062] A bogie is provided with the composite material traction rod of Embodiment 1.

[0063] Example 3

[0064] A rail vehicle equipped with the bogie shown in Embodiment 2.

[0065] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A composite material traction rod, characterized in that, include: The composite fiber rod comprises a composite fiber rod body, a metal end cap, and a wedge-shaped block. The composite fiber rod body is a quadrangular prism structure, including a middle section and two ends, the two ends of which are used to connect to the metal end cap. The outer surface of the quadrangular prism structure includes two sets of opposing side surfaces. The first set of side surfaces includes a first surface and a second surface that are parallel to each other. The middle sections of the second set of side surfaces are parallel to each other and flare outward at a set angle at the ends to form a wedge shape. The metal end cap includes an insertion groove, and the end of the composite fiber rod body is inserted into the insertion groove in a direction perpendicular to the length of the composite material traction rod. The second set of side surfaces is in contact with the inner surface of the insertion groove, and the first surface is in contact with the bottom surface of the insertion groove. A wedge-shaped block is installed in the insertion groove, and the wedge-shaped block is installed in a wedge-shaped block mounting groove on the inner surface of the insertion groove in a direction from the middle to the end. The composite fiber rod is constrained within the insertion slot, and the inner surface of the wedge block is in contact with the second surface. The cross-section of the wedge block perpendicular to the length direction of the composite traction rod is trapezoidal, with the base of the trapezoid in contact with the second surface. The hypotenuse of the trapezoid is in contact with the inclined surface within the wedge block mounting slot. The wedge block gradually tapers inward along the installation direction, and the inclined surface of the wedge block mounting slot gradually tapers inward along the installation direction of the wedge block, so that the wedge block completely covers the end of the composite fiber rod. A carbon fiber circumferential reinforcing layer is wound around the outer side of the middle portion of the composite fiber rod, and a carbon fiber longitudinal tensile layer is wrapped around the metal end, the outer side of the insertion slot, and the outer side of the carbon fiber circumferential reinforcing layer. A carbon fiber circumferential reinforcing layer is wrapped around the outer side of the wedge block in a circumferential direction perpendicular to the length direction of the composite traction rod.

2. The composite material traction rod as described in claim 1, characterized in that, The second set of sides flares outward at the ends, forming an angle of 170-177° with the middle part, creating an outward-expanding wedge shape.

3. The composite material traction rod as described in claim 1, characterized in that, The composite fiber rod is integrally formed by laying T 700 grade carbon fiber prepreg in a 0° layup along the length direction, and is assembled with the metal end by adhesive during assembly.

4. The composite material traction rod as described in claim 1, characterized in that, The wedge block is made of the same material as the metal end.

5. The composite material traction rod as described in claim 1, characterized in that, The carbon fiber circumferential reinforcing layer is flush with the outer surface of the insertion groove and with the outer surface of the wedge block.

6. The composite material traction rod as described in claim 1, characterized in that, The carbon fiber circumferential reinforcement layer is obtained by circumferentially winding and curing T 700 grade carbon fiber bundles mixed with resin along the composite fiber rod.

7. The composite material traction rod as described in claim 1, characterized in that, The metal end includes a circular portion that smoothly transitions to the outer surface of the insertion groove. A groove is provided on the outer side of the circular portion, and the grooves of the circular portions of the metal ends at both ends are aligned.

8. The composite material traction rod as described in claim 7, characterized in that, A longitudinally supporting carbon fiber layer covers the outer side of the groove, the insertion slot, and the outer side of the carbon fiber circumferential reinforcing layer; the circumferential reinforcing layer covers the joint between the carbon fiber circumferential reinforcing layer and the metal joint.

9. The composite material traction rod as described in any one of claims 6-8, characterized in that, The carbon fiber circumferential reinforcing layer, the carbon fiber longitudinal tensile layer, the carbon fiber circumferential strengthening layer, and the composite fiber rod are fused together as a single resin material.

10. A bogie, characterized in that, Includes the composite material traction rod as described in any one of claims 1-9.

11. A rail vehicle, characterized in that, Includes the bogie as described in claim 10.

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