Locomotive brake drum, bogie assembly and rack rail train

Abstract

The invention discloses a locomotive brake drum, a bogie assembly and a rack rail train, and relates to the technical field of rail trains, the locomotive brake drum comprises a brake drum body and a plurality of reinforcing parts, the brake drum body is of a cylindrical structure, the outer circumferential surface of the brake drum body is a brake working surface, and the reinforcing parts are installed on the inner circumferential surface of the brake drum body; the reinforcing pieces are used for enhancing the structural strength of the brake drum body, the structural strength and rigidity of the brake drum body are enhanced, meanwhile, the cooling airflow is driven through kinetic energy of rotation of the brake drum, the heat dissipation efficiency of the brake drum is greatly improved, and the service life of the brake drum is prolonged.

Description

Technical Field

[0001] This invention relates to the field of railcar technology, and more specifically, to a locomotive brake drum. Furthermore, this invention also relates to a bogie assembly including the aforementioned locomotive brake drum. Additionally, this invention relates to a rack train including the aforementioned bogie assembly. Background Technology

[0002] The unique operating environment of cogwheel trains on steep gradients necessitates a different braking method compared to traditional rail vehicles. When operating on tracks with gradients greater than 60‰, traditional wheel-rail adhesion braking alone is insufficient to provide adequate braking force; therefore, cogwheel trains must be equipped with non-adhesion braking systems.

[0003] The drive system of rack and pinion trains can be divided into wheel-rail combined drive, rack and pinion combined drive, and rack and pinion independent drive. Brake drums are used in both drive systems. Taking rack and pinion independent drive as an example, during operation, the motor torque is transmitted to the hollow shaft through the drive gear. The hollow shaft drives the brake drum and rack and pinion wheel to rotate. The rack and pinion wheel mesh with the rack and pinion laid on the track, thus providing power. When braking, the brake band grips and rubs against the brake drum, providing braking force and causing the vehicle to stop.

[0004] Gear trains have the following characteristics: long gradient operation, heavy load, and frequent start-stop and braking. Therefore, the harsh service environment causes the brake drum to heat up severely, which leads to a decrease in the friction coefficient between the friction pads and the brake drum, a decrease in braking efficiency, and an increase in braking distance. Over time, this affects the rigidity of the brake drum, making it prone to fatigue cracks on the surface, greatly shortening the service life of the brake drum and endangering braking safety.

[0005] In conclusion, how to extend the service life of brake drums is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] In view of this, the purpose of the present invention is to provide a locomotive brake drum that enhances the structural strength and rigidity of the brake drum body, reduces brake drum fatigue, and helps to extend the service life of the brake drum.

[0007] Another object of the present invention is to provide a bogie assembly including the above-described locomotive brake drum.

[0008] Another object of the present invention is to provide a rack train including the above-described bogie assembly.

[0009] To achieve the above objectives, the present invention provides the following technical solution:

[0010] A locomotive brake drum, comprising:

[0011] The brake drum body is a cylindrical structure, and its outer circumferential surface is the braking working surface;

[0012] A plurality of reinforcing members are mounted on the inner circumferential surface of the brake drum body;

[0013] Several of the aforementioned reinforcing members are used to enhance the structural strength of the brake drum body.

[0014] Furthermore, in this invention, several of the reinforcing members are arc-shaped fan-blade structures and are used to form a flow of air along the axial direction of the brake drum body.

[0015] Furthermore, in this invention, a plurality of the reinforcing members are arranged in at least one ring along the axial direction of the brake drum body, and each ring contains a plurality of reinforcing members evenly distributed along the axial direction of the brake drum body.

[0016] Furthermore, the present invention also includes:

[0017] The mounting protrusion is a ring-shaped structure and is coaxially arranged on the inner circumferential surface of the brake drum body.

[0018] The mounting protrusion is used to fix the brake drum body to the power shaft.

[0019] Furthermore, the mounting protrusion is provided with a plurality of mounting holes and a plurality of ventilation holes;

[0020] The mounting holes are used to fix the brake drum body to the power shaft;

[0021] Several of the ventilation holes are used for gas circulation;

[0022] The axes of the plurality of mounting holes and the plurality of ventilation holes are all distributed parallel to the axis of the mounting protrusion.

[0023] Furthermore, in this invention, several of the ventilation holes are oblong holes, and several of the mounting holes and several of the ventilation holes are alternately distributed.

[0024] Furthermore, in this invention, a plurality of the reinforcing members are arranged in two concentric rings along the axial direction of the brake drum body, with the two concentric rings of reinforcing members located on both sides of the mounting protrusion;

[0025] The two reinforcing members rotate in the same direction to form a unidirectional airflow along the axis of the brake drum body.

[0026] Furthermore, the inner circumferential surface of the brake drum body is in the shape of an hourglass with a small radial dimension in the middle and a large radial dimension at both ends.

[0027] A bogie assembly, comprising the locomotive brake drum as described in any of the preceding claims, further comprising:

[0028] A power shaft, on which the brake drum body is coaxially mounted;

[0029] A drive gear is coaxially mounted on the power shaft for meshing with a preset gear track.

[0030] The wheelset consists of two rollers, which are respectively mounted on both ends of the drive shaft.

[0031] A rack train includes the aforementioned bogie assembly.

[0032] The locomotive brake drum provided by this invention includes a brake drum body and several reinforcing members. The brake drum body is a cylindrical structure formed by forging or casting, with its outer circumferential surface serving as the braking working surface. Several reinforcing members are installed on the inner circumferential surface of the brake drum body. These reinforcing members enhance the structural strength of the brake drum body. They can be integrally formed with the brake drum body, which further enhances the support and reinforcement of the brake drum body. During braking, a large amount of frictional heat is generated on the braking working surface and rapidly conducted to the entire drum body. The core function of the reinforcing members is to enhance the structural strength and rigidity of the brake drum body, allowing for a significant reduction in the wall thickness of the brake drum body while ensuring the overall structural safety of the brake drum. This results in significant weight reduction, which is crucial for reducing the unsprung mass of the bogie. Furthermore, the reduced material usage lowers manufacturing costs and rotational inertia, indirectly saving traction energy.

[0033] The bogie assembly provided by the present invention includes the above-mentioned locomotive brake drum, which has the above-mentioned beneficial effects. It also utilizes the kinetic energy of the rotation of the brake drum to drive the cooling airflow, eliminating the need for additional fans or pumps, making it energy-saving and reliable. Its heat dissipation efficiency is greatly improved compared to relying solely on heat conduction and natural convection.

[0034] The present invention also provides a rack train, including the bogie assembly described above, which has the aforementioned beneficial effects. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0036] Figure 1 This is a schematic diagram of the structure of the brake drum shaft side provided by the present invention;

[0037] Figure 2 This is a schematic diagram of the side structure of the brake drum provided by the present invention;

[0038] Figure 3 A schematic diagram of the axial cross-section of the brake drum provided by the present invention;

[0039] Figure 4 This is a schematic diagram of the structure of the brake drum provided by the present invention during installation and use.

[0040] Figures 1-4 In the accompanying drawings, the reference numerals include:

[0041] 1. Brake drum body; 101. Working surface;

[0042] 2. Reinforcing components;

[0043] 3. Install the protrusion;

[0044] 4. Drive shaft;

[0045] 5. Ventilation holes;

[0046] 6. Mounting holes;

[0047] 7. Drive gear;

[0048] 8. Rotation. Detailed Implementation

[0049] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0050] The core of this invention is to provide a locomotive brake drum that enhances the structural strength and rigidity of the brake drum body, reduces brake drum fatigue, and helps to extend the service life of the brake drum.

[0051] Another core aspect of this invention is to provide a bogie assembly including the aforementioned locomotive brake drum.

[0052] Another core aspect of this invention is to provide a rack train comprising the aforementioned bogie assembly.

[0053] Please refer to Figure 1 A locomotive brake drum includes a brake drum body 1 and several reinforcing members 2. The brake drum body 1 has a cylindrical structure, and its outer peripheral surface is the braking working surface 101. Several reinforcing members 2 are installed on the inner peripheral surface of the brake drum body 1. The several reinforcing members 2 are used to enhance the structural strength of the brake drum body 1.

[0054] It should be noted that, in this embodiment of the invention, the brake drum body 1 is made of high-strength, high-thermal-conductivity alloy cast iron (such as vermicular graphite cast iron) or forged steel, and has an overall cylindrical structure. Its outer circumferential surface is precision-machined to form a smooth and flat braking working surface 101, which is used to rub against the brake band (or brake pads) to generate braking force.

[0055] In addition, in this embodiment of the invention, several reinforcing members 2 can be integrally formed with the brake drum body 1.

[0056] In one embodiment, the reinforcing member 2 can be designed in various forms, such as straight ribs, mesh ribs, dotted bosses, etc., mainly to perform the reinforcing function, and the raised structure increases the contact area between the brake drum and the air, thereby improving the heat dissipation efficiency.

[0057] In the above embodiment, the mesh ribs are continuous mesh structures that are cast or machined directly from the inner wall surface of the brake drum body 1, and all intersections of the mesh ribs are firmly connected to the inner wall of the drum body. The mesh ribs are densely distributed throughout the inner circumferential surface of the entire brake drum body 1. This location is the main path for heat conduction and a key area where heat dissipation needs to be enhanced.

[0058] In one embodiment, the mesh ribs adopt a diamond-shaped intersecting mesh. Compared with a simple cross-shaped orthogonal mesh, the diamond-shaped mesh has better isotropy when subjected to complex multi-directional stress, more uniform stress distribution, and better fatigue resistance. The flow channels formed by the diamond-shaped mesh are more conducive to the generation of air vortices, enhancing the turbulent heat transfer effect.

[0059] In other embodiments, each of the dot-shaped protrusions is an independent discrete unit that protrudes directly from the inner wall substrate of the brake drum body 1. Instead, it is an attached extension structure on the inner wall surface. It can be uniformly distributed in an interlaced (or quincunx) array, rather than a simple row and column alignment. This layout can accommodate more protrusions per unit area, maximize the heat dissipation area, and at the same time generate more complex turbulence in the air flowing through it, thus disrupting the thermal boundary layer.

[0060] In the above embodiments, the density of the protrusions in the area near the center of the brake drum can be appropriately increased, or their shape can be gradually changed into radial reinforcing ribs that smoothly transition with the sidewall of the spoke, so as to ensure the local stiffness of the stress concentration area and promote the conduction and dissipation of heat from the sidewall of the drum body to the central spoke.

[0061] In one embodiment, a ceramic-based composite coating may be sprayed onto the surface of the reinforcing member 2 to improve wear resistance and thermal shock resistance.

[0062] In a specific implementation of this invention, the locomotive brake drum includes a brake drum body 1 and several reinforcing members 2. The brake drum body 1 is a cylindrical structure formed by forging or casting, with its outer circumferential surface being the braking working surface 101. Several reinforcing members 2 are installed on the inner circumferential surface of the brake drum body 1. The several reinforcing members 2 are used to enhance the structural strength of the brake drum body 1. The several reinforcing members 2 can be integrally formed with the brake drum body 1, which is beneficial to further enhance the support and reinforcement of the brake drum body 1. That is, during braking, a huge amount of frictional heat is generated on the braking working surface 101 and is quickly conducted to the entire drum body. The core function of the reinforcing members 2 is to enhance the structural strength and rigidity of the brake drum body 1, so that the wall thickness of the brake drum body 1 can be significantly reduced while ensuring the overall structural safety of the brake drum, thereby achieving significant weight reduction. This is crucial for reducing the unsprung mass of the bogie, and the reduction in material usage lowers manufacturing costs and rotational inertia, indirectly saving traction energy consumption.

[0063] Please refer to Figure 1 In some embodiments, several reinforcing members 2 are arc-shaped fan blade structures and are used to form airflow along the axial direction of the brake drum body 1. That is, the cross section of each fan blade is streamlined arc-shaped, similar to the blade of a fan. When the brake drum rotates at high speed with the axle, these arc-shaped fan blades are no longer passive static reinforcing ribs, but become active aerodynamic elements.

[0064] According to the principles of fluid mechanics, the rotating arc-shaped fan blades do work on the surrounding air, driving the air to move along the arc-shaped surface of the fan blades. Since all the fan blades have the same arc-shaped curvature direction (i.e., they have the same "rotation direction"), they work together to form a stable airflow along the axis of the brake drum body 1 in the axial space inside the brake drum. This airflow flows from one end of the brake drum to the other end. Therefore, this axial flow airflow generated spontaneously by rotation continuously flows through the high-temperature brake drum cavity and fan blade surface, carrying away heat through convection heat transfer, thus achieving active and self-driven air cooling.

[0065] In one embodiment, the arc shape can be a single circular arc, a multi-segment circular arc, or a parabola, or a combination of single and multi-segment circular arcs can be used to optimize aerodynamic efficiency at different speeds.

[0066] In the above embodiments, the multi-segment circular arc composite profile is formed by smoothly connecting two or three segments of circular arcs with different radii. A larger radius is used at the root of the blade (where it bears greater stress) to ensure strength, while a smaller radius is used at the tip of the blade (where it dominates aerodynamic performance) to increase curvature and improve the pumping efficiency at low speeds.

[0067] The reinforcing member 2 with its arc-shaped blade structure solves both the problem of strengthening the brake drum body 1 and the problem of efficient heat dissipation. It also utilizes the kinetic energy of the rotating brake drum to drive the cooling airflow, eliminating the need for additional fans or pumps. This method is energy-efficient, reliable, and its heat dissipation efficiency is significantly improved compared to relying solely on heat conduction and natural convection.

[0068] In other embodiments, a hybrid layout of guide ribs and fan blades can be adopted. In the inlet contraction section and outlet expansion section of the inner circumference of the brake drum, straight ribs or guide plates that emphasize the guiding and strengthening effect are mainly arranged to regulate the airflow, reduce inlet impact loss and outlet vortex, while in the throat area, which is the narrowest and hottest in the middle, aerodynamically optimized arc-shaped fan blades are concentrated to achieve precise allocation of heat dissipation resources.

[0069] In other embodiments, an adjustable fan blade structure can be adopted. Specifically, the fan blade is connected to the inner wall through a micro-shaft, or a micro-adjustment mechanism driven by a shape memory alloy or a thermistor bimetallic strip can be used. When the temperature inside the brake drum exceeds a certain threshold, the mechanism drives the fan blade to fine-tune the installation angle, dynamically increasing the airflow and achieving adaptive intelligent heat dissipation.

[0070] Specifically, the fan blade structure consists of three layers, located in the first, second, and third sections respectively. The first section is fixedly connected to the inner circumference of the brake drum and is integrally molded. The second section uses shape memory metal or a rotating shaft structure. The third section is the fan blade body, which is fixedly connected to the second section. Therefore, when the temperature inside the brake drum exceeds a certain threshold, the shape memory metal takes on a preset shape, thus achieving adjustment of the fan blade position and angle, giving it a wider heat dissipation temperature range.

[0071] Please refer to Figure 1 In some embodiments, a plurality of reinforcing members 2 are arranged in at least one ring along the axial direction of the brake drum body 1, and each ring contains a plurality of reinforcing members 2 evenly distributed along the axial direction of the brake drum body 1. Specifically, one ring means one ring along the circumference of the brake drum body 1, and at least one ring makes the plurality of reinforcing members 2 arranged in multiple rows.

[0072] In the above embodiment, each ring contains a number of reinforcing members 2 evenly distributed around the circumference of the brake drum body 1. For example, 24 reinforcing members 2 are arranged in one ring, and the included angle between adjacent reinforcing members 2 is 15 degrees. The even distribution ensures rotational dynamic balance, prevents vibration caused by uneven mass, and makes the airflow and strength enhancement effect uniform in the circumference.

[0073] In other embodiments, the multiple rings of different reinforcing members 2 can be axially aligned or staggered. The staggered arrangement is preferred as it can better disrupt the airflow boundary layer and enhance heat transfer efficiency.

[0074] Therefore, the axial multi-ring layout ensures that the entire heat load zone of the brake drum has a reinforced structure and cooling airflow, and the circumferential uniform distribution ensures extremely high dynamic balance accuracy, making it suitable for high-speed rotation scenarios.

[0075] Please refer to Figure 1 In some embodiments, the vehicle brake drum further includes a mounting protrusion 3, which is an annular structure. The mounting protrusion 3 is coaxially located on the inner circumferential surface of the brake drum body 1. The mounting protrusion 3 is used to fix the brake drum body 1 to the drive shaft 4. The mounting protrusion 3 is the key connection interface between the brake drum and the vehicle drive shaft 4 (i.e., the rotating shaft that transmits torque, which is often a hollow shaft in a rack train). Its inner hole is a precision-machined cylindrical surface. By using interference fit, key connection, or flange connection with the corresponding shaft segment on the drive shaft 4, the brake drum is firmly fixed to ensure reliable torque transmission.

[0076] In the above embodiment, the thickness and width of the mounting protrusion 3 need to be strictly calculated to withstand all the braking torque and part of the axial force. Its position is located in the center of the axial direction of the brake drum body 1, which helps to balance the force.

[0077] Please refer to Figure 1 In some embodiments, the mounting protrusion 3 is provided with a plurality of mounting holes 6, which are used to fix the brake drum body 1 to the power shaft 4. Specifically, the mounting holes 6 are smooth holes or threaded holes, and the number can be determined according to the size of the brake drum (e.g., 8-16). The axis of the mounting holes 6 is parallel to the axis of the mounting protrusion 3, and they are distributed in a ring array for inserting high-strength bolts to fasten the brake drum to the flange on the power shaft 4. This is one of the main torque transmission paths.

[0078] In some embodiments, the mounting protrusion 3 is provided with a plurality of ventilation holes 5 for gas circulation. Specifically, the plurality of ventilation holes 5 are oblong holes, and there are multiple ventilation holes 5. The axis of the ventilation holes 5 is parallel to the axis of the mounting protrusion 3. The preferred shape is an oblong hole (long oval hole). The stress concentration coefficient of the oblong hole is much smaller than that of the round hole under the same opening area, and the fatigue resistance is better.

[0079] In one embodiment, the axes of several mounting holes 6 and several ventilation holes 5 are all distributed parallel to the axis of the mounting protrusion 3, and the mounting holes 6 and several ventilation holes 5 are distributed alternately. For example, there are a total of 16 holes, with 8 mounting holes 6 and 8 ventilation holes 5 arranged at 22.5 degrees interval. This layout makes the bolt tightening force evenly distributed, and the ventilation holes 5 are also evenly distributed, ensuring that the airflow can pass through the mounting protrusion 3 evenly.

[0080] In practice, the mounting protrusion 3 forms two cavities on the inner circumferential surface of the brake drum body 1. The axial airflow generated by the arc-shaped fan blades flows through one cavity of the brake drum, passes through these ventilation holes 5, passes through the mounting protrusion 3, and enters the other cavity. Finally, it is discharged by the fan blades on the other side, forming a complete axial ventilation channel. The alternating layout ensures connection rigidity while providing the maximum ventilation area. Furthermore, the waist-shaped ventilation hole 5 design reduces the risk of crack initiation under cyclic thermal stress and mechanical stress.

[0081] In one embodiment, several reinforcing members 2 are arranged in two concentric rings along the axial direction of the brake drum body 1. The two rings of reinforcing members 2 are located on both sides of the mounting protrusion 3, and the two rings of reinforcing members 2 have the same rotation direction to form a unidirectional airflow along the axial direction of the brake drum body 1. Specifically, the two rings of reinforcing members 2 are respectively the first ring of fan blades and the second ring of fan blades, and the rotation direction of the first ring of fan blades and the second ring of fan blades is exactly the same, that is, their bending direction is the same when viewed from the axial direction. Since the two rings of fan blades have the same rotation direction, when the brake drum rotates, the first ring of fan blades on the left is the intake fan blade, which draws in external air. Cold air is drawn into the left cavity, and the airflow passes through the left cavity and absorbs heat. Then, it enters the right cavity through the ventilation hole 5 on the mounting protrusion 3. Since the second ring of fan blades on the right side rotates in the same direction, they form exhaust fan blades, which accelerate the discharge of hot air from the right cavity, thereby forming a strong, unidirectional axial cooling airflow. The heat dissipation efficiency is much higher than that of turbulent or unorganized flow. Moreover, as long as the rotation direction design is matched, the airflow direction is always fixed, and the heat dissipation effect is stable and reliable. It is perfectly adapted to the frequent reversing conditions of the rack train, and the heat dissipation performance has no directional difference.

[0082] Please refer to Figure 1 In some embodiments, the inner circumferential surface of the brake drum body 1 is an hourglass shape with a small radial dimension in the middle and a large radial dimension at both ends. Specifically, the inner circumferential surface of the brake drum body 1 is a double cone shape or a throat-constriction shape, that is, when viewed from the axial section, the inner cavity outline is a symmetrical "X" shape.

[0083] As airflow flows from the wide inlet into the narrow "throat" in the middle, the velocity increases. The high-speed airflow can more effectively disrupt the thermal boundary layer of the high-temperature wall, enhancing convective heat transfer. Subsequently, the airflow decelerates in the expansion section, partially recovering dynamic pressure and reducing flow resistance. In this embodiment, the axial airflow driven by the arc-shaped fan blades is accelerated when flowing through the hourglass-shaped contraction section, greatly enhancing the heat exchange intensity with the central high-temperature area (corresponding to the main friction area of ​​the outer surface) that needs the most heat dissipation. This targeted cooling of the area with the highest heat load, along with the reasonable flow channel shape, reduces the energy consumption of gas flow, making the self-cooling system operate more efficiently.

[0084] A bogie assembly includes a locomotive brake drum, a drive shaft 4, a drive gear 7, and wheelsets 8. The brake drum body 1 is coaxially mounted on the drive shaft 4, and the drive gear 7 is coaxially mounted on the drive shaft 4 for meshing with a preset gear track. The wheelsets 8 consist of two rollers, which are respectively mounted at both ends of the drive shaft 4. The torque of the traction motor is transmitted to the drive gear 7 through a reducer. The drive gear 7 meshes with the gear track, driving the drive shaft 4, brake drum, and the entire bogie forward, with the wheels following. In emergency or steep slope braking, the brake band grips the outer working surface 101 of the brake drum, generating a huge non-adhesive braking force. At this time, the self-cooling system inside the brake drum is immediately activated, efficiently dissipating heat and preventing thermal fade of braking performance. The integrated high-efficiency heat dissipation brake drum ensures stable and reliable non-adhesive braking force under the most severe continuous braking conditions, which is the fundamental guarantee for driving safety.

[0085] A rack train, including a bogie assembly, features brake drums with superior heat dissipation capabilities that allow for more frequent braking and shorter braking intervals, improving operational efficiency and scheduling flexibility on complex mountain lines. Real-time and effective heat dissipation also prevents downtime accidents caused by brake overheating.

[0086] The key point of this invention is that the brake drum includes a brake drum body 1 and several reinforcing members 2. The brake drum body 1 is a cylindrical structure formed by forging or casting, and its outer peripheral surface is the braking working surface 101. Several reinforcing members 2 are installed on the inner peripheral surface of the brake drum body 1. The several reinforcing members 2 are used to enhance the structural strength of the brake drum body 1. The several reinforcing members 2 can be integrally formed with the brake drum body 1, which is beneficial to further enhance the support of the brake drum body 1. That is, during braking, a huge amount of frictional heat is generated on the braking working surface 101 and is quickly conducted to the entire drum body. The core function of the reinforcing members 2 is to enhance the structural strength and rigidity of the brake drum body 1, so that the wall thickness of the brake drum body 1 can be significantly reduced while ensuring the overall structural safety of the brake drum, thereby achieving significant weight reduction. This is crucial for reducing the unsprung mass of the bogie, and the reduction in material usage reduces manufacturing costs and rotational inertia, indirectly saving traction energy consumption.

[0087] In addition to the locomotive brake drums disclosed in the above embodiments, the present invention also provides a bogie assembly including the above-mentioned locomotive brake drums. The structures of other parts of the bogie assembly are described in the prior art and will not be repeated here.

[0088] In addition to the bogie assemblies disclosed in the above embodiments, the present invention also provides a rack train including the above-described bogie assembly. The structures of other parts of the rack train are described in the prior art and will not be repeated here.

[0089] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0090] The present invention has provided a detailed description of a locomotive brake drum, bogie assembly, and rack train. Specific examples have been used to illustrate the principles and implementation methods of the invention. The descriptions of these embodiments are merely illustrative of the methods and core ideas of the invention. It should be noted that those skilled in the art can make various improvements and modifications to the invention without departing from its principles, and these improvements and modifications also fall within the scope of protection of the invention.

Claims

1. A locomotive brake drum, characterized in that, include: Brake drum body (1), the brake drum body (1) is a cylindrical structure, and its outer peripheral surface is the braking working surface (101). A plurality of reinforcing members (2) are mounted on the inner circumferential surface of the brake drum body (1); Several of the reinforcing members (2) are used to enhance the structural strength of the brake drum body (1).

2. The locomotive brake drum according to claim 1, characterized in that, Several of the reinforcing members (2) are arc-shaped fan blade structures and are used to form a flow of air along the axial direction of the brake drum body (1).

3. The locomotive brake drum according to claim 2, characterized in that, Several reinforcing members (2) are arranged in at least one circle along the axial direction of the brake drum body (1), and each circle contains several reinforcing members (2) evenly distributed along the axial direction of the brake drum body (1).

4. The locomotive brake drum according to claim 3, characterized in that, Also includes: The mounting protrusion (3) is a ring-shaped structure and is coaxially arranged on the inner circumferential surface of the brake drum body (1). The mounting protrusion (3) is used to fix the brake drum body (1) to the power shaft (4).

5. The locomotive brake drum according to claim 4, characterized in that, The mounting protrusion (3) is provided with a number of mounting holes (6) and a number of ventilation holes (5); Several mounting holes (6) are used to fix the brake drum body (1) to the power shaft (4). Several of the ventilation holes (5) are used for gas circulation; The axes of the plurality of mounting holes (6) and the plurality of ventilation holes (5) are all distributed parallel to the axis of the mounting protrusion (3).

6. The locomotive brake drum according to claim 5, characterized in that, The ventilation holes (5) are waist-shaped holes, and the mounting holes (6) and ventilation holes (5) are distributed alternately.

7. The locomotive brake drum according to claim 6, characterized in that, Several of the reinforcing members (2) are arranged in two rings along the axial direction of the brake drum body (1), and the two rings of reinforcing members (2) are respectively located on both sides of the mounting protrusion (3); The two reinforcing members (2) rotate in the same direction to form a unidirectional airflow along the axis of the brake drum body (1).

8. The locomotive brake drum according to any one of claims 4-7, characterized in that, The inner circumferential surface of the brake drum body (1) is hourglass-shaped with a small radial dimension in the middle and a large radial dimension at both ends.

9. A bogie assembly, characterized in that, Including the locomotive brake drum as described in any one of claims 4-8, it further includes: The power shaft (4) is coaxially mounted on the brake drum body (1). A drive gear (7) is coaxially mounted on the power shaft (4) for meshing with a preset gear track. The wheelset (8) consists of two rollers, which are respectively installed at both ends of the power shaft (4).

10. A rack train, characterized in that, Includes the bogie assembly as described in claim 9.

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