Bogies and railcars

Abstract

To provide a bogie truck having advantages such as light weight, high strength, stable and reliable conductivity, etc. [Solution] A bogie truck is disclosed, comprising a frame including a frame body (1) and a mounting base (2), wherein the frame body (1) is made of a composite material, a portion of the mounting base (2) is a composite material mounting base (2a), and a portion of the mounting base (2) is a metallic material mounting base (2b). The composite material frame body (1) and the composite material mounting base (2a) are connected by screw fasteners (5), and are electrically conductive at the locations where the screw fasteners (5) are attached. The composite material frame body (1) and the metallic material mounting base (2b) are connected by screw fasteners (5), riveted with rivet connection elements (4), and bonded with a structural adhesive, and are insulated at the locations where the screw fasteners (5) are attached and are electrically conductive at the locations where the rivet connection elements (4) are attached. A railway vehicle is further disclosed, which includes the bogie truck.

Description

[Technical Field]

[0001] This application relates to the technical field of rail vehicles, and in particular to bogies for rail vehicles.

[0002] This application claims priority from a Chinese patent application filed with the China Patent Office on April 17, 2023, bearing application number 202310411692.8 and entitled "Bogie Truck and Railway Vehicle," the entire contents of which are incorporated herein by reference. [Background technology]

[0003] Since bogies account for more than 40% of the total weight of a railway vehicle, reducing the weight of bogies is an important point in energy conservation and cost reduction for railway vehicles. Summary of the Invention [Problem to be solved by the invention]

[0004] While reducing the weight of the bogie, it is necessary to take into consideration the strength performance, conductivity performance, etc. of the bogie, and achieving both weight reduction and these performance characteristics is a technical problem that those skilled in the art must solve. [Means for solving the problem]

[0005] In order to solve the above technical problems, the present application provides a bogie truck, comprising a frame including a frame body and a mounting base, the frame body is a composite frame body, a portion of the mounting base is a composite mounting base, and a portion of the mounting base is a metal mounting base, the composite frame body and the composite mounting base are connected by screw fasteners, and the composite frame body and the metal mounting base are connected by screw fasteners, riveted by rivet connecting elements, and bonded by structural adhesive.

[0006] In one embodiment, a conductive medium is filled in the annular gap between the outer peripheral surface of the rivet connection element and the rivet connection hole.

[0007] In one embodiment, for multiple rivet connection elements connected to the same metal mounting base, a conductive medium is filled in the annular gap between the outer surface of some or all of the rivet connection elements and the rivet connection hole.

[0008] In one embodiment, a structural adhesive is provided at least between the composite frame body and the mounting surface of the riveted element of the metal mounting base, and both ends of the riveted element and the riveted element are in close contact, thereby forming the annular gap into an enclosed space.

[0009] In one embodiment, the axis of the rivet connection element and the screw fastener connected to the same metal mounting base form an included angle of 45° to 90°.

[0010] In one embodiment, the mounting structure using screw fasteners between the composite frame body and the composite mounting base is such that metal inserts are fitted into both the composite frame body and the composite mounting base, and screw fasteners are connected to the two metal inserts, and are arranged so that the potential difference between the metal inserts and the screw fasteners is smaller than a predetermined value.

[0011] In one embodiment, the mounting structure using screw fasteners between the composite frame body and the metal mounting base is arranged so that a metal connection element is connected to the composite frame body, a screw fastener is connected to the metal connection element, and an insulating layer is provided between the metal connection element and the composite frame body.

[0012] In one embodiment, the metal connection element includes a large diameter portion and a small diameter portion, the small diameter portion is connected to a hole in the composite frame body, and a rotation prevention locking groove is provided in the large diameter portion, and a nut that engages with a threaded fastener is locked in the rotation prevention locking groove.

[0013] In one embodiment, a metal current collecting point is provided on the composite material frame body, and each conductive portion of the frame collects current at the metal current collecting point.

[0014] The present application also provides a railway vehicle, including a bogie truck, the bogie truck employing any one of the bogie trucks described above. [Effects of the Invention]

[0015] The bogie provided by the present application has advantages such as light weight, high strength, stable and reliable conductivity, etc. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a schematic diagram of the entire frame structure of a bogie truck of a railway vehicle provided by the present application; [Figure 2] FIG. 1 is a schematic diagram of the connection structure between a composite frame body and one metal mounting base. [Figure 3] FIG. 2 is a cross-sectional view of the attachment site of the rivet joint element. [Figure 4] 10 is a cross-sectional view of a mounting location of a screw fastener on a composite frame body and a composite mounting base. FIG. [Figure 5] 10 is a cross-sectional view of a mounting portion of a frame body made of a composite material and a mounting base made of a metal material, where a screw fastener is mounted. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0017] In order to make those skilled in the art better understand the technical solution of the present application, the technical solution of the present application will be further described in detail below in combination with drawings and specific embodiments.

[0018] As shown in FIG. 1, the frame of the bogie truck includes a frame body 1 and a plurality of mounting bases 2 connected to the frame body 1.

[0019] The frame body 1 is mainly composed of a cross beam and side beams, and in the illustrated embodiment, the frame body 1 is mainly composed of one cross beam and two side beams, forming an "H"-shaped structure.

[0020] The mounting base 2 provides a mounting base for other components of the bogie, and generally includes a brake suspension base, an anti-roll bar base, a positioning rotation arm base, a current collecting shoe base, a fuse box base, a lateral stopper base, a lateral damper base, a traction rod base, etc.

[0021] The frame body 1 is made of a composite material, a portion of the mount 2 is made of a composite material, and a portion of the mount 2 is made of a metal material, and this combination of materials effectively reduces the weight of the frame while improving its strength. Specifically, the composite material may be a carbon fiber reinforced composite material, and the metal material may be low alloy steel, stainless steel, titanium alloy, etc.

[0022] The composite frame body 1 is provided with one or more metal current collecting points 3, and in Figure 1, the metal current collecting points 3 are provided at the ends of the side beams. Each conductive part of the frame collects and conducts current at the metal current collecting points 3, which also ensures the reliable conduction of currents such as the frame's return current and static electricity, ensuring safety during use. Specifically, each conductive part may collect current to the metal current collecting point 3 through the conductivity of the metal parts themselves, or it may collect current to the metal current collecting point 3 via an external lead wire, copper strip, etc.

[0023] As shown in Figure 2, the composite frame body 1 and the metal mounting base 2b are connected by screw fasteners 5, riveted by rivet connection elements 4, and bonded by structural adhesive 11. This type of combination and connection method can ensure the connection strength of the two different material parts.

[0024] As shown in Figure 3, by reasonably matching the engagement size between the rivet connection element 4 and the rivet connection hole, an annular gap is formed between the outer circumferential surface of the rivet connection element 4 and the rivet connection hole, and the annular gap is filled with a conductive medium 6, which may be conductive grease, conductive paste, etc. For ease of explanation, this arrangement will hereinafter be referred to as the conductive arrangement.

[0025] When rivet holes are drilled in the composite frame body 1, the carbon fiber bundles inside the composite are exposed, and the carbon fiber threads have excellent conductivity. After adopting the above-mentioned conductive arrangement, the carbon fiber threads conduct electricity to the metal rivet connection elements 4 through the conductive medium 6, and the metal rivet connection elements 4 further conduct electricity to the metal mounting base 2b, thereby achieving excellent conductivity between the composite frame body 1 and the metal mounting base 2b.

[0026] Generally, the surface material of a composite material is made of resin, but this leads to poor conductivity of the composite material, and when connected to a metal part, good electrical conduction cannot be achieved. The above-mentioned conductive arrangement effectively solves this problem and achieves an equipotential ground connection between the composite part and the metal part.

[0027] When multiple rivet fastening elements 4 are connected to a single metal mounting base 2b (for example, four rivet fastening elements 4 are connected to the metal mounting base 2b in Figure 2), the above-mentioned conductive arrangement can be implemented for only one or some of the rivet fastening elements 4, and the normal arrangement can be adopted for the other rivet fastening elements 4, and of course, theoretically, the above-mentioned conductive arrangement can be implemented for all rivet fastening elements 4 connected to the same metal mounting base 2b.

[0028] As shown in Figure 3, structural adhesive 11 is applied at least between the composite frame body 1 and the mounting surface of the riveted element 4 of the metal mounting base 2b, and both ends of the riveted element 4 (ends A and B in the drawing) are in close contact with the riveted element, so that the annular gap between the riveted element 4 and the rivet hole becomes an enclosed space, preventing leakage of the conductive medium 6 filled therein and delaying oxidation degradation of the conductive medium 6, making the conductive performance more stable. Furthermore, the application of structural adhesive 11 at this position effectively limits the relative radial displacement between the riveted element 4 and the rivet hole, stably maintaining the annular gap filled with the conductive medium 6 and ensuring stable conductive performance.

[0029] As shown in Figure 2, preferably, the axes of the rivet connection element 4 and the screw fastener 5 connected to the same metal mounting base 2b form an included angle of 45° to 90°. That is, the rivet connection element 4 and the screw fastener 5 are respectively attached to two mounting surfaces of the same metal mounting base 2b that form an included angle of 45° to 90° with each other. This makes full use of the axial tensile and pressing performance of the rivet connection element 4 to reduce the shear force received, and also limits the relative displacement between the rivet connection element 4 and the rivet hole, thereby further improving the stability of electrical conductivity.

[0030] As shown in FIG. 4, the mounting structure using screw fasteners 5 between the composite frame body 1 and the composite mounting base 2a has metal inserts 8 fitted into both the composite frame body 1 and the composite mounting base 2a, and the screw fasteners 5 are connected to the two metal inserts 8, and are arranged so that the potential difference between the metal inserts 8 and the screw fasteners 5 is smaller than a predetermined value. Specifically, both the metal inserts 8 and the screw fasteners 5 may be made of a high-potential metal material, such as stainless steel or titanium alloy.

[0031] With such a mounting structure, the composite material frame body 1 and the composite material mounting base 2a realize electrical conduction at the mounting locations of the screw fasteners 5, improving the reliability of electrical conductivity of the entire frame.

[0032] As shown in Figure 5, the mounting structure using a screw fastener 5 between a composite material frame body 1 and a metal mounting base 2b has a metal connection element 9 connected to the composite material frame body 1, the screw fastener 5 is connected to the metal connection element 9, and an insulating layer 12 is provided between the metal connection element 9 and the composite material frame body 1.

[0033] Specifically, in FIG. 5 , the threaded fastener 5 is a bolt. The metal connection element 9 has a central through-hole, and a large-diameter portion 9a and a small-diameter portion 9b are formed in this order along the axial direction. A rotation-preventing locking groove 9c is formed within the large-diameter portion 9a of the metal connection element 9, and the nut 10 is locked into the rotation-preventing locking groove 9c, preventing loosening. The small-diameter portion 9b of the metal connection element 9 is connected to a hole in the composite material frame body 1, and an insulating layer 12 is provided between the small-diameter portion 9b and the hole. The bolt passes through a hole in the metal mounting base 2b and the small-diameter portion 9b of the metal connection element 9, and then enters the large-diameter portion 9a of the metal connection element 9 and is fastened to the nut 10. An anti-loosening washer 7 is provided between the head of the bolt and the metal mounting base 2b. By rationally selecting materials, the potential difference between the anti-loosening washer 7, bolt, nut 10, metal connecting element 9, and metal mounting base 2b can be controlled to be smaller than a predetermined value. For example, if the metal mounting base 2b is made of low-alloy steel, low-alloy steel may also be selected for the anti-loosening washer 7, bolt, nut 10, and metal connecting element 9.

[0034] With this mounting structure, the composite frame body 1 and the metallic mounting base 2b, which are connected to each other, are insulated at the mounting location of the screw fastener 5, thereby preventing electrochemical corrosion between the two different material parts due to a large potential difference. Electrical conductivity between the composite frame body 1 and the metallic mounting base 2b, which are connected to each other, is achieved by the above-mentioned conductive arrangement at the rivet joint location.

[0035] In the illustrated embodiment of the present application, the composite frame body 1 and the composite mounting base 2a are connected by screw fasteners 5, achieving electrical conductivity at the screw fastener 5 attachment locations, and the composite frame body 1 and the metal mounting base 2b are connected by screw fasteners 5 and riveted to be bonded, achieving insulation at the screw fastener 5 attachment locations and electrical conductivity at the riveted attachment locations.

[0036] The above describes the principles and embodiments of the present application using specific examples, and the description of the above examples is only used to understand the method and gist of the present application. Here, those skilled in the art may make some improvements and modifications to the present application without departing from the principles of the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application. [Explanation of symbols]

[0037] 1 ···Frame body; 2 ··· Mounting base; 2a ···Composite mounting base; 2b: Metal mounting base; 3 ···Metal current collecting point; 4 ···Rivet joint elements; 5 ···Threaded fasteners; 6...conductive medium; 7 ···Anti-loosening washer; 8 ···Metal inserts; 9 ···Metallic connection elements; 9a ···Large diameter section; 9b...Small diameter part; 9c ···Anti-rotation locking groove; 10 ···nut; 11 ···Structural adhesives; 12. Insulating layer.

Claims

1. 1. A bogie bogie comprising a frame including a frame body (1) and a mounting base (2), wherein the frame body (1) is a composite material frame body, a portion (2) of the mounting base is a composite material mounting base (2a), and the portion (2) of the mounting base is a metallic material mounting base (2b), the composite material frame body (1) and the composite material mounting base (2a) are connected by screw fasteners (5), and the composite material frame body (1) and the metallic material mounting base (2b) are connected by screw fasteners (5), riveted by rivet connecting elements (4) and bonded by a structural adhesive (11).

2. 2. The bogie according to claim 1, wherein an annular gap between the outer peripheral surface of the rivet connection element and the rivet connection hole is filled with a conductive medium.

3. 3. The bogie according to claim 2, wherein for a plurality of rivet fastening elements (4) connected to the same metal mounting base (2), a conductive medium (6) is filled in the annular gap between the outer peripheral surface of some or all of the rivet fastening elements (4) and the rivet fastening hole.

4. 4. The bogie truck according to claim 3, wherein a structural adhesive (11) is provided at least between the composite frame body (1) and the mounting surface of the riveted element (4) of the metal mounting base (2b), and both ends of the riveted element (4) and the riveted element are in close contact with each other, thereby forming the annular gap into a sealed space.

5. 2. The bogie according to claim 1, wherein the axes of the rivet connection elements (4) and the screw fasteners (5) connected to the mounting base (2b) made of the same metal material form an included angle of 45° to 90°.

6. The bogie truck according to any one of claims 1 to 5, characterized in that the mounting structure between the composite material frame body (1) and the composite material mounting base (2) using screw fasteners (5) is such that metal inserts (8) are fitted into both the composite material frame body (1) and the composite material mounting base (2a), the screw fasteners (5) are connected to the two metal inserts (8), and the potential between the metal inserts (8) and the screw fasteners (5) is set to be smaller than a predetermined value.

7. 6. The bogie according to claim 1, wherein the mounting structure between the composite material frame body (1) and the metal mounting base (2b) using the screw fasteners (5) is arranged such that a metal connection element (9) is connected to the composite material frame body (1), the screw fasteners (5) are connected to the metal connection element (9), and an insulating layer (12) is provided between the metal connection element (9) and the composite material frame body (1).

8. 8. The bogie truck according to claim 7, wherein the metal connection element (9) comprises a large diameter portion (9a) and a small diameter portion (9b), the small diameter portion (9b) is connected to a hole in the composite material frame body, the large diameter portion (9a) is provided with an anti-rotation locking groove (9c), and a nut (10) engaging with the threaded fastener (5) is locked in the anti-rotation locking groove (9c).

9. The bogie truck according to any one of claims 1 to 5, characterized in that a metal current collecting point (3) is provided on the composite material frame body, and each conductive portion of the frame collects current at the metal current collecting point (3).

10. A railway vehicle including a bogie bogie, characterized in that the bogie bogie is a bogie bogie according to any one of claims 1 to 9.

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