Wheelset axle end grounding device and railway vehicle

Abstract

The utility model discloses a pair of wheel pair axle end grounding device and railway vehicle relates to railway vehicle technical field, this pair of wheel pair axle end grounding device includes the friction ring of fixed in the axle end part, the end cover of fixed in the axle box end part, the brush holder of fixed in the end cover side to the friction ring, a plurality of carbon brush of being along the circumferential and being located in the brush holder and a plurality of elastic pieces of being along the circumferential and being fixed in the brush holder and along the radial extrusion all carbon brush one -to -one corresponding to the friction ring. The utility model adopts the elastic radial extrusion design of all directions, makes every group carbon brush all by independent elastic piece along the radial continuous compression on the friction ring, makes every group carbon brush and the friction ring always keep close contact, ensures no matter the violent vibration of whatever direction that car body runs produces, all carbon brush can realize the stable contact of full angle with the friction ring, not only effectively suppresses the contact pressure fluctuation caused by vibration, more radically reduces the risk of sporadic grounding, thereby promotes the working stability of wheel pair axle end grounding device.

Description

Technical Field

[0001] This utility model relates to the field of rail vehicle technology, and in particular to a wheelset axle end grounding device and a rail vehicle. Background Technology

[0002] The wheelset axle end grounding device is a key electrical connection device installed at the end of the axle. Its core function is to safely and reliably conduct the current accumulated on the car body into the rail through the sliding contact between friction components (such as carbon brushes and friction discs or friction rings), thereby protecting the bearings from electrolytic corrosion damage and ensuring the integrity of the train's electrical circuit.

[0003] Currently, common grounding devices are mainly divided into two structures: end-grind type and single-carbon-brush inner-side ring-grind type. Due to the limited installation space at the axle end, both structures struggle to achieve both sufficient conductive contact area and stable contact. Specifically, the end-grind type grounding device relies on the perpendicular contact between the carbon brush end face and the friction disc to conduct current. During vehicle operation, especially under the lateral acceleration generated when passing through curves or switches, the carbon brush is prone to lateral displacement, or even momentarily separating from the friction disc. This unstable contact state directly leads to a sharp increase in contact resistance or momentary interruption of the current path, severely disrupting the continuity of the grounding circuit and making it difficult to guarantee operational stability. While the single-carbon-brush inner-side ring-grind type changes the contact method to radial contact between the carbon brush and the inner side of the friction ring, improving the brush's guidance and stability to some extent, it still relies on a single contact point. Under the complex vibration environment generated by continuous train operation, it is difficult to effectively maintain a constant contact pressure. Fluctuations in contact pressure directly cause changes in contact resistance, ultimately leading to poor contact.

[0004] Therefore, under the dual constraints of limited installation space and complex operating conditions, how to improve the working stability of the wheelset axle end grounding device has become a key technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] The purpose of this invention is to provide a wheel-axle end grounding device and a rail vehicle. Each set of carbon brushes is continuously pressed radially against the friction ring by an elastic element. All carbon brushes maintain good contact with the friction ring at all angles, reducing the risk of poor grounding and effectively improving working stability.

[0006] To achieve the above objectives, this utility model provides a wheelset axle end grounding device, comprising:

[0007] Friction ring fixed to the end of the axle;

[0008] End cap fixed to the end of the axle box;

[0009] A brush holder fixed to the side of the end cap facing the friction ring;

[0010] Several carbon brushes arranged circumferentially on the brush holder;

[0011] Several elastic elements are fixed circumferentially to the brush holder and radially press all the carbon brushes one by one against the friction ring.

[0012] In some embodiments, a positioning ring is also included, which is fixedly connected to the end of all carbon brushes away from the brush holder.

[0013] In some embodiments, a fixing plate is fixedly provided at one end of the brush holder facing the friction ring, and one end of each carbon brush is slidably inserted into the fixing plate in the radial direction and the other end is threadedly connected to the positioning ring.

[0014] In some embodiments, the elastic element is specifically a coil spring, one end of which extends to be fixedly connected to the fixing plate, and the extension is tangent to the coil spring.

[0015] In some embodiments, the end cap has a receiving groove for accommodating a brush holder, the bottom of the receiving groove having a wire hole, the brush holder having a wire fixed thereon, the wire passing through the wire hole.

[0016] In some embodiments, the brush holder has a protruding wire clamp at the end away from the carbon brush, the wire clamp being used to fix the wire; the bottom of the receiving groove has a clearance groove for avoiding the wire clamp.

[0017] In some embodiments, the friction ring includes a connecting portion abutting against the end of the axle and a contact portion extending axially. The connecting portion is fixed at the end of the contact portion, and the connecting portion and the connecting portion form a receiving groove. All carbon brushes abut against the inner sidewall of the receiving groove.

[0018] In some embodiments, the contact portion extends axially and covers the entire carbon brush, and a gap is formed between the contact portion and the brush holder.

[0019] In some embodiments, the connecting portion is fixed to the end of the axle by a fastening bolt; the positioning ring maintains a set distance from the head of the fastening bolt.

[0020] This utility model also provides a rail vehicle, including an axle, an axle box, and the aforementioned wheelset axle end grounding device, wherein the wheelset axle end grounding device is disposed between the axle and the axle box.

[0021] Compared with the prior art, the present invention optimizes the structure of the wheelset axle end grounding device. The optimized wheelset axle end grounding device includes a friction ring, an end cover, a brush holder, several carbon brushes, and several elastic elements. The friction ring is fixed to the end of the axle, the end cover is fixed to the end of the axle box, the brush holder is fixed to the side of the end cover facing the friction ring, all carbon brushes are arranged circumferentially on the brush holder, all elastic elements are fixed circumferentially on the brush holder, and all elastic elements radially press the carbon brushes against the friction ring.

[0022] This invention employs an all-around elastic radial compression design, ensuring that each set of carbon brushes is continuously pressed radially against the friction ring by an independent elastic element. This maintains close contact between each set of carbon brushes and the friction ring, guaranteeing stable contact between all carbon brushes and the friction ring regardless of the direction of severe vibration generated during vehicle operation. This not only effectively suppresses contact pressure fluctuations caused by vibration but also fundamentally reduces the risk of occasional grounding failure, thereby improving the working stability of the wheelset axle end grounding device. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0024] Figure 1 This is a cross-sectional view of the wheelset axle end grounding device provided in an embodiment of the present utility model;

[0025] Figure 2 for Figure 1 Sectional view along line AA;

[0026] Figure 3 for Figure 1 Assembly diagram of the center positioning ring, carbon brush and brush holder;

[0027] Figure 4 for Figure 3 Exploded view;

[0028] Figure 5 for Figure 4 Front view of the positioning ring.

[0029] The attached figures are labeled as follows:

[0030] 1. Axle, 2. Friction ring, 3. Axle box, 4. End cap, 5. Brush holder, 6. Carbon brush, 7. Elastic component, and 8. Positioning ring;

[0031] Connecting part 21, contact part 22 and fastening bolt 23;

[0032] Receiving slot 41;

[0033] Clearance slot 411;

[0034] Fixing plate 51, wire 52 and wire clamp 53;

[0035] Extension 71. Detailed Implementation

[0036] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0037] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] In this text, the axial direction refers to the direction along the center line of the brush holder, the radial direction refers to the radius direction of the brush holder, and the circumferential direction refers to the direction around the center line of the brush holder.

[0039] This utility model embodiment provides a wheelset axle end grounding device, as shown in the attached figure. Figure 1 and 2 As shown, the assembly includes a friction ring 2, an end cap 4, a brush holder 5, several carbon brushes 6, and several elastic elements 7. The friction ring 2 is fixed to the end of the axle 1, and the end cap 4 is fixed to the end of the axle box 3. However, the friction ring 2 and the end cap 4 do not contact each other in the axial direction of the brush holder 5. The brush holder 5 is fixed to the side of the end cap 4 facing the friction ring 2. Specifically, a flange ring protrudes from the outer side of the brush holder 5, and a connecting bolt passes through the end cap 4, fixing the connecting bolt to the flange ring.

[0040] All carbon brushes 6 are circumferentially mounted on the brush holder 5, and all elastic elements 7 are circumferentially fixed on the brush holder 5. All elastic elements 7 radially correspond one-to-one with each other, pressing the carbon brushes 6 against the friction ring 2. It is important to note that all carbon brushes 6 and all elastic elements 7 are evenly distributed circumferentially on the brush holder 5, ensuring that all carbon brushes 6 and all elastic elements 7 are radially aligned with each other on the brush holder 5. Specifically, the brush holder 5 has eight carbon brushes 6 and eight elastic elements 7.

[0041] This invention employs an all-around elastic radial compression design, ensuring that each set of carbon brushes 6 is continuously pressed radially against the friction ring 2 by an independent elastic element 7. This ensures that each set of carbon brushes 6 maintains close contact with the friction ring 2 at all times, guaranteeing stable contact between all carbon brushes 6 and the friction ring 2 regardless of the direction of severe vibration generated during vehicle operation. This not only effectively suppresses contact pressure fluctuations caused by vibration but also fundamentally reduces the risk of occasional grounding failure, thereby improving the working stability of the wheelset axle end grounding device.

[0042] As a preferred embodiment, as shown in the appendix Figures 1 to 5As shown, the wheelset axle end grounding device also includes a positioning ring 8, which is fixedly connected to the end of all carbon brushes 6 away from the brush holder 5. The positioning ring 8 constrains the position of all carbon brushes 6 along the axial direction of the brush holder 5, effectively suppressing the axial movement and sway of the carbon brushes 6, and ensuring that the radial clamping force generated by the elastic element 7 can be efficiently transmitted to the contact surface of the friction ring 2, avoiding contact instability caused by axial displacement.

[0043] In a preferred embodiment, a fixing plate 51 is fixedly mounted on one end of the brush holder 5 facing the friction ring 2. One end of each carbon brush 6 is radially slidably inserted into the fixing plate 51, and the other end is threadedly connected to the positioning ring 8. Specifically, the fixing plate 51 is provided with a radial groove, and one end of the carbon brush 6 is embedded in the radial groove and slidably engaged with the radial groove, providing radial guidance for the carbon brush 6. This effectively prevents the carbon brush 6 from tilting, getting stuck, or detaching under complex working conditions, thereby ensuring that the carbon brush 6 maintains stable floating contact with the friction ring 2 under the support of the elastic element 7. The threaded connection between the positioning ring 8 and the carbon brush 6 not only limits the axial movement of the carbon brush 6 but also allows for radial fine-tuning of the carbon brush 6, thereby compensating for dimensional errors generated during manufacturing and assembly, further optimizing the contact state between the carbon brush 6 and the friction ring 2, and improving the adaptability and reliability of the entire grounding device.

[0044] In a preferred embodiment, the elastic element 7 is specifically a coil spring, with one end of the coil spring extending into an extension 71 that is fixedly connected to the fixed plate 51. The extension 71 is tangential to the coil spring. The extension 71 serves as a direct force transmission path between the coil spring and the fixed plate 51, efficiently converting the elastic force into the radial clamping force of the carbon brush 6. On the one hand, this ensures that the torque of the coil spring can be smoothly and without abrupt changes transmitted to the fixed plate 51 during compression and rebound, avoiding local stress concentration caused by end torsional deformation, which is beneficial to improving the fatigue life of the coil spring. On the other hand, the fixed design of the extension 71 greatly enhances the constraint rigidity of the coil spring end, preventing the coil spring from slipping as a whole or warping at the end during operation, thereby ensuring a more stable radial pressure applied by the coil spring to the carbon brush 6.

[0045] In a preferred embodiment, the end cap 4 has a receiving groove 41 for accommodating the brush holder 5. A wire hole is provided at the bottom of the receiving groove 41. A wire 52 is fixedly mounted on the brush holder 5. The wire 52 passes through the wire hole, allowing the equipment on the vehicle to be grounded sequentially via the wire 52, brush holder 5, carbon brush 6, friction ring 2, axle 1, wheel, and rail. The wire hole positions and holds the wire 52, limiting its range of motion and effectively preventing problems such as tangling or wear of the wire 52 due to continuous vibration during long-term vehicle operation, thus significantly improving the safety of the electrical connection.

[0046] In a preferred embodiment, the brush holder 5 has a protruding wire clamp 53 at the end away from the carbon brush 6, which is used to fix the wire 52; the bottom of the receiving groove 41 is provided with a relief groove 411 to avoid the wire clamp 53, so as to prevent the end cap 4 from squeezing the wire clamp 53 and the wire 52, eliminating the potential risk of short circuit due to insulation wear, and reducing the grounding failure rate caused by the connection problem of the wire 52.

[0047] In a preferred embodiment, the friction ring 2 includes a connecting portion 21 that abuts against the end of the axle 1 and a contact portion 22 extending axially. The connecting portion 21 is fixed to the end of the contact portion 22 and is responsible for installation positioning and torque transmission. The connecting portion 21 and the connecting portion 22 form a receiving groove, and all the carbon brushes 6 abut against the inner wall of the receiving groove. This provides a protected sealed environment for the carbon brushes 6, blocking most of the external contaminants such as splashed water, dust and debris from the wheel side from entering, reducing the risk of abnormal wear and arc erosion. At the same time, the inner wall of the receiving groove provides circumferential guidance for the carbon brushes 6, enhancing the stability of the carbon brushes 6 against lateral vibration, ensuring that the carbon brushes 6 and the friction ring 2 can maintain continuous and uniform close contact when the vehicle is running at high speed, and improving the service life of the entire grounding device.

[0048] In a preferred embodiment, the contact portion 22 extends axially and covers the entire carbon brush 6, completely shielding the sliding contact section between the carbon brush 6 and the friction ring 2. This effectively blocks the direct impact and intrusion of most foreign objects such as rain, snow, dust, and gravel from the wheel direction, reducing poor contact or abnormal wear caused by contamination. A gap is formed between the contact portion 22 and the brush holder 5, ensuring that the brush holder 5 will never mechanically interfere with the high-speed rotating friction ring 2 during operation, preventing potential short-circuit risks and effectively improving the operational safety of the grounding device.

[0049] In a preferred embodiment, the connecting part 21 is fixed to the end of the axle 1 by the fastening bolt 23; the positioning ring 8 and the head of the fastening bolt 23 maintain a set distance to ensure that there is a sufficient safe insulation distance between the positioning ring 8 and the fastening bolt 23 of the friction ring 2, avoid any form of contact between the positioning ring 8 and the friction ring 2, effectively prevent short circuit problems caused by carbon powder accumulation or humid environment, and help improve operational reliability.

[0050] This utility model embodiment also provides a rail vehicle, including an axle 1, an axle box 3, and the aforementioned wheel axle end grounding device. The wheel axle end grounding device is located between the axle 1 and the axle box 3. The optimized structure of the wheel axle end grounding device improves the reliability of the entire vehicle.

[0051] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0052] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A wheelset axle end grounding device, characterized in that, include: Friction ring (2) fixed to the end of axle (1); End cap (4) fixed to the end of the axle box (3); A brush holder (5) is fixed to the end cap (4) on the side facing the friction ring (2); Several carbon brushes (6) are arranged circumferentially on the brush holder (5); Several elastic elements (7) are fixed circumferentially to the brush holder (5) and radially press all the carbon brushes (6) one by one against the friction ring (2).

2. The wheelset axle end grounding device according to claim 1, characterized in that, It also includes a positioning ring (8) fixedly connected to one end of all the carbon brushes (6) away from the brush holder (5).

3. The wheelset axle end grounding device according to claim 2, characterized in that, The brush holder (5) is fixedly provided with a fixing plate (51) at one end facing the friction ring (2), and one end of each carbon brush (6) is slidably inserted into the fixing plate (51) in the radial direction and the other end is threadedly connected to the positioning ring (8).

4. The wheelset axle end grounding device according to claim 3, characterized in that, The elastic element (7) is specifically a coil spring, one end of which extends to be fixedly connected to the fixed plate (51) and the extension (71) is tangent to the coil spring.

5. The wheelset axle end grounding device according to any one of claims 1 to 4, characterized in that, The end cap (4) has a receiving groove (41) for accommodating the brush holder (5), and the bottom of the receiving groove (41) is provided with a wire hole. The brush holder (5) is fixed with a wire (52), and the wire (52) passes through the wire hole.

6. The wheelset axle end grounding device according to claim 5, characterized in that, The brush holder (5) has a wire clip (53) protruding at one end away from the carbon brush (6), and the wire clip (53) is used to fix the wire (52); the bottom of the receiving groove (41) is provided with a clearance groove (411) for avoiding the wire clip (53).

7. The wheelset axle end grounding device according to claim 2, characterized in that, The friction ring (2) includes a connecting part (21) that abuts against the end of the axle (1) and a contact part (22) that extends axially. The connecting part (21) is fixed to the end of the contact part (22). The connecting part (21) and the connecting part (22) form a receiving groove. All the carbon brushes (6) abut against the inner sidewall of the receiving groove.

8. The wheelset axle end grounding device according to claim 7, characterized in that, The contact portion (22) extends axially and covers the entire carbon brush (6), and a gap is formed between the contact portion (22) and the brush holder (5).

9. The wheelset axle end grounding device according to claim 7, characterized in that, The connecting part (21) is fixed to the end of the axle (1) by a fastening bolt (23); the positioning ring (8) maintains a set distance from the head of the fastening bolt (23).

10. A rail vehicle, characterized in that, It includes an axle (1), an axle box (3), and a wheelset axle end grounding device as described in any one of claims 1 to 9, wherein the wheelset axle end grounding device is disposed between the axle (1) and the axle box (3).

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