Ductile iron brake drum with both heat dissipation grooves and fins

Abstract

This utility model relates to the field of brake technology, specifically a ductile iron brake drum that combines heat dissipation grooves and fins. It includes a chassis, a pair of brake shoes hinged within the chassis, brake pads mounted on the brake shoes, and a brake drum fitted onto the chassis. The brake shoes have several heat dissipation grooves, and reinforcing ribs are provided inside the brake shoes. Heat-conducting fins are mounted on the reinforcing ribs, and several heat dissipation fins are mounted on the heat-conducting fins. Several grooves are formed on the outer circumferential surface of the brake drum, and several air-collecting shrouds are mounted on the outer circumferential surface of the brake drum. This ductile iron brake drum, combining heat dissipation grooves and fins, forms a coordinated internal and external heat dissipation system by providing heat dissipation fins and air-collecting shrouds on the outer circumference of the brake drum, and heat dissipation grooves, heat-conducting fins, and heat dissipation fins on the inner side of the brake drum. This achieves efficient heat dissipation without the need for ventilation holes, preventing dust, mud, and other debris from entering the brake drum, ensuring stable and reliable braking performance, and improving driving safety.

Description

Technical Field

[0001] This utility model relates to the field of brake technology, specifically to a ductile iron brake drum that combines heat dissipation grooves and fins. Background Technology

[0002] Ductile iron brake drums are crucial components of vehicle braking systems, made from ductile iron. This material combines high strength and toughness, enabling it to withstand the frictional impacts and high temperatures generated during braking. They typically work in conjunction with brake shoes and brake pads, generating braking force through friction with the brake pads to help the vehicle decelerate or stop. Widely used in various types of motor vehicles, they provide fundamental protection for vehicle safety and are one of the key load-bearing components in the braking system that enables braking functionality.

[0003] The utility model patent with patent number CN216867361U discloses a high heat dissipation brake drum. The high heat dissipation brake drum includes a drum body, a mounting surface on one side of the drum body, mounting holes evenly arranged on the upper part of the mounting surface, a heat dissipation surface for heat dissipation on the outside of the drum body, heat dissipation components evenly arranged on the upper part of the heat dissipation surface, a ventilation surface for heat dissipation on one side of the heat dissipation surface of the drum body, and heat dissipation components and ventilation surface arranged on the upper part of the drum body. Therefore, the overall heat dissipation effect of the brake drum is improved, solving the problem that traditional brake drums have poor heat dissipation and are prone to cracking when too much heat accumulates.

[0004] This high-heat-dissipation brake drum accelerates internal airflow and assists in heat dissipation by opening ventilation holes on the ventilation surface. However, during vehicle operation, especially in complex road conditions such as dust and mud, the ventilation holes can easily allow dust, mud and other debris to enter the brake drum. These debris will adhere to the surface of key components such as brake shoes and brake pads, reducing the friction coefficient between components. In severe cases, it may even cause slippage, affecting braking performance and posing a threat to driving safety. In view of this, we propose a ductile iron brake drum that combines heat dissipation grooves and fins. Utility Model Content

[0005] The purpose of this invention is to provide a ductile iron brake drum that combines heat dissipation grooves and fins, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A ductile iron brake drum, incorporating both heat dissipation grooves and fins, includes a chassis fixedly connected to a vehicle. A pair of brake shoes are hinged within the chassis. Brake pads are mounted on the outer surfaces of the brake shoes. The brake drum is fitted onto the top of the chassis. Several heat dissipation grooves are formed on the inner surfaces of the brake shoes. A reinforcing rib is located at the center of the inner surface of the brake shoes. A heat-conducting fin is mounted on the reinforcing rib. Several heat dissipation fins are integrally formed on the top of the heat-conducting fin. The brake drum is mounted on a wheel via a wheel hub and rotates with the wheel. Several grooves are formed on the outer circumferential surface of the brake drum. Several heat dissipation fins are also fixed to the outer circumferential surface of the brake drum. Several air-collecting shrouds are mounted on the outer circumferential surface of the brake drum, covering the outside of the heat dissipation fins.

[0008] Preferably, the brake shoe has an arc-shaped plate structure, the heat dissipation groove is transparent, and a plurality of the heat dissipation grooves are distributed in a ring array on the brake shoe with the axis of the brake shoe as the center.

[0009] In this design, the arc-shaped structure adapts to the curvature of the brake drum inner wall to ensure uniform contact of the brake pads, the permeable heat dissipation grooves can accelerate the discharge of hot air, and the ring array distribution ensures that heat dissipation is even in all areas of the brake shoes.

[0010] Preferably, the heat-conducting sheet has a fan-shaped annular structure and is fixed to the top surface of the reinforcing rib plate with bolts, and a plurality of heat dissipation fins are distributed in a ring array on the heat-conducting sheet with the axis of the heat-conducting sheet as the center;

[0011] In this configuration, the fan-shaped heat-conducting fins can fully cover the reinforcing ribs, improving heat absorption efficiency, while the ring-shaped array of heat sinks can ensure uniform airflow and accelerate heat transfer.

[0012] Preferably, the end of the brake shoe is hinged to the chassis via a hinge shaft, and a brake wheel cylinder is provided between the beginning ends of the two brake shoes. The brake wheel cylinder is fixed on the chassis, and the beginning ends of the two brake shoes respectively abut against the beginning and end ends of the brake wheel cylinder.

[0013] In this setup, the hinge provides a stable fulcrum for the brake shoes, and the fixed brake wheel cylinder can precisely transmit thrust, causing the two brake shoes to open synchronously and ensuring stable braking performance.

[0014] Preferably, a return spring is provided between the first ends of the two reinforcing ribs of the two brake shoes, and the first and last ends of the return spring are hook-shaped and respectively hooked onto the two reinforcing ribs;

[0015] In this configuration, the hook-shaped return spring can securely connect the two reinforcing ribs, and can reliably pull the brake shoes back to their original position after braking, thus separating the brake pads from the brake drum.

[0016] Preferably, the grooves and the heat dissipation fins are both inclined on the outer surface of the brake drum, and the grooves and the heat dissipation fins are distributed in a ring array on the outer peripheral surface of the brake drum with the axis of the brake drum as the center;

[0017] In this configuration, the inclined structure guides airflow and enhances cooling, while the ring array distribution ensures uniform heat dissipation around the brake drum, preventing localized overheating that could lead to deformation or wear.

[0018] Preferably, a plurality of protruding plates are fixed in a circular array on the top wall inside the brake drum, with the axis of the brake drum as the center, and the positions of the protruding plates correspond to the positions of the heat sinks;

[0019] In this configuration, the protruding plates of the ring array rotate with the brake drum, which can push the internal air to form an airflow. The corresponding arrangement with the heat sink can directly accelerate the heat exchange of the heat sink and improve the internal heat dissipation efficiency.

[0020] Preferably, the first end of the air collecting shroud is an air inlet port, and the last end of the air collecting shroud is an air outlet port. The size of the air inlet port is larger than the size of the air outlet port. Both the top and bottom ends of the air collecting shroud are provided with protruding edges. The protruding edges are fixed to the outer surface of the brake drum by bolts. The orientation of the air inlet port is the same as the rotation direction of the wheel.

[0021] In this configuration, the air inlet port is larger than the exhaust port to create airflow velocity and improve cooling effect. The convex edge and bolts ensure that the air collector shroud is firmly fixed. The air inlet port facing the direction of wheel rotation can improve air collection efficiency.

[0022] Compared with the prior art, the beneficial effects of this utility model are:

[0023] This ductile iron brake drum, which combines heat dissipation grooves and fins, features heat dissipation fins and an air shroud on its outer periphery, and heat dissipation grooves, reinforcing ribs, heat-conducting fins, and heat dissipation fins on its inner side. This forms a coordinated internal and external heat dissipation system, achieving efficient heat dissipation without the need for ventilation holes. It also prevents dust, mud, and other debris from entering the brake drum, ensuring stable and reliable braking performance and improving driving safety. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0025] Figure 2 This is an exploded view of the overall structure of this utility model;

[0026] Figure 3 This is a schematic diagram of the brake shoe structure in this utility model;

[0027] Figure 4This is a schematic diagram of the brake drum in this utility model;

[0028] Figure 5 This is a structural schematic diagram of the brake drum from the bottom view of this utility model;

[0029] Figure 6 This is a schematic diagram of the structure of the air shroud in this utility model;

[0030] The meanings of the labels in the diagram are as follows:

[0031] 100. Chassis; 110. Brake shoe; 111. Reinforcing rib; 112. Heat dissipation groove; 113. Heat conduction plate; 114. Heat dissipation plate; 120. Brake pad; 130. Brake wheel cylinder; 140. Return spring;

[0032] 200. Brake drum; 210. Groove; 220. Heat dissipation fins; 230. Raised plate; 240. Air collector cover; 241. Air inlet port; 242. Air outlet port; 243. Raised edge. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. 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.

[0034] Please see Figures 1-6The brake drum, made of ductile iron and incorporating both heat dissipation grooves and fins, includes a chassis 100 fixedly connected to the vehicle. The chassis 100 provides the mounting base for the entire braking system, stably supporting components such as brake shoes 110 and brake wheel cylinders 130, ensuring positional stability during braking. A pair of brake shoes 110 are hinged within the chassis 100, rotating around a hinge axis to provide a mounting carrier for brake pads 120, enabling them to contact the inner wall of the brake drum 200 for braking. Brake pads 120 are mounted on the outer surface of the brake shoes 110, directly contacting the inner wall of the brake drum 200, generating braking force through friction to decelerate or stop the vehicle. The brake drum 200 is fitted onto the top of the chassis 100, acting as a rotating component during braking; its inner wall engages with the brake pads 120 to produce a frictional braking effect. The brake drum 200 is mounted on the wheel via a wheel hub and travels with the vehicle. The rotation of the wheel can synchronously transmit the rotational motion of the wheel, ensuring stable friction between the brake shoe 120 and the brake pad 120 during braking. The end of the brake shoe 110 is hinged to the chassis 100 through a hinge shaft. This hinge structure provides a rotation fulcrum for the brake shoe 110, ensuring that the brake shoe 110 can smoothly open towards the brake drum 200 under the action of the brake wheel cylinder 130. The brake wheel cylinder 130 is provided between the heads of the two brake shoes 110. The brake wheel cylinder 130 can hydraulically push the heads of the two brake shoes 110 to open outward, providing power for the rotation of the brake shoes 110. The brake wheel cylinder 130 is fixed on the chassis 100, which can ensure that the position of the brake wheel cylinder 130 is fixed during operation, avoiding the impact of displacement on the transmission of thrust. The heads of the two brake shoes 110 respectively abut against the heads and tails of the brake wheel cylinder 130, ensuring that the thrust of the brake wheel cylinder 130 can directly act on the brake shoes 110, realizing the synchronous opening action of the brake shoes 110. A reinforcing rib 111 is provided at the middle position of the inner surface of the brake shoe 110. The reinforcing rib 111 can enhance the structural strength of the brake shoe 110 and prevent the brake shoe 110 from deforming due to force during braking. A return spring 140 is provided between the first ends of the two reinforcing ribs 111 of the two brake shoes 110. The return spring 140 pulls the first ends of the two brake shoes 110 closer to each other through its own elastic tension after braking, so that the brake pad 120 separates from the inner wall of the brake drum 200. The first and last ends of the return spring 140 are hook-shaped and are respectively hooked on the two reinforcing ribs 111. The hook-shaped structure can ensure that the return spring 140 and the reinforcing rib 111 are firmly connected and prevent the spring from falling off and affecting the return function.

[0035] As shown in Figures 2 and 3, in this invention, the brake shoe 110 has an arc-shaped plate structure. The arc-shaped structure is adapted to the curvature of the inner wall of the brake drum 200, which can ensure that the brake pad 120 and the inner wall of the brake drum 200 are in uniform contact, thus improving the braking effect. Several heat dissipation grooves 112 are formed on the inner surface of the brake shoe 110. The heat dissipation grooves 112 can increase the heat dissipation area of ​​the brake shoe 110 and facilitate the exhaust of hot air inside the brake drum 200. The heat dissipation grooves 112 are transparent, which can reduce the accumulation of hot air inside the brake shoe 110 and accelerate the heat dissipation. Several heat dissipation grooves 112 are distributed in a ring array on the brake shoe 110 with the axis of the brake shoe 110 as the center. The ring array distribution can make the heat dissipation of each area of ​​the brake shoe 110 uniform, avoiding local overheating and thus preventing the performance of the brake shoe 110 from deteriorating.

[0036] As shown in Figures 2 and 3, specifically, a heat-conducting plate 113 is installed on the reinforcing rib 111. The heat-conducting plate 113 can quickly absorb the heat from the brake shoe 110 and the reinforcing rib 111 and transfer the heat to the heat sink 114. The heat-conducting plate 113 has a fan-shaped annular structure and is fixed to the top surface of the reinforcing rib 111 with bolts. The fan-shaped annular structure is compatible with the arc-shaped structure of the brake shoe 110 and can fully cover the surface of the reinforcing rib 111, improving the heat absorption efficiency. The bolt fixing method facilitates the installation and replacement of the heat-conducting plate 113. Several heat sinks 114 are integrally formed on the top of the heat-conducting plate 113. The heat sinks 114 can further increase the heat dissipation area and accelerate the transfer of heat from the heat-conducting plate 113 to the air. Several heat sinks 114 are distributed in a ring array on the heat-conducting plate 113 with the axis of the heat-conducting plate 113 as the center. The ring array distribution can make the airflow around the heat sink 114 more uniform and avoid local heat accumulation.

[0037] As shown in Figure 5, further, several protruding plates 230 are fixed in a circular array on the top wall inside the brake drum 200 with the axis of the brake drum 200 as the center. When the protruding plates 230 rotate synchronously with the brake drum 200, they can push the air inside the brake drum 200 to flow, forming an axial airflow. The position of the protruding plates 230 corresponds to the position of the heat sink 114. The corresponding position allows the airflow pushed by the protruding plates 230 to directly act on the surface of the heat sink 114, accelerating the heat exchange between the heat sink 114 and the air.

[0038] As shown in Figures 1, 2, 4, and 5, the brake drum 200 has several grooves 210 on its outer peripheral surface. These grooves 210 increase the heat dissipation area of ​​the brake drum 200 and facilitate airflow around it, accelerating heat dissipation. Several heat dissipation fins 220 are also fixed to the outer peripheral surface of the brake drum 200. These fins further expand the heat dissipation area and increase the rate at which the brake drum 200 dissipates heat to the outside air. Both the grooves 210 and the heat dissipation fins 220 are inclined on the outer surface of the brake drum 200. This inclined structure guides airflow along the inclined direction when the brake drum 200 rotates, enhancing the cooling effect on the grooves 210 and the heat dissipation fins 220. The grooves 210 and the heat dissipation fins 220 are arranged in a ring array around the axis of the brake drum 200 on its outer peripheral surface. This ring array ensures uniform heat dissipation in all areas of the brake drum 200, preventing localized overheating that could lead to deformation or increased wear of the brake drum 200.

[0039] As shown in Figures 1, 2 and 6, it is worth noting that several air collection shrouds 240 are installed on the outer peripheral surface of the brake drum 200. The air collection shrouds 240 can guide the outside air to the heat dissipation fins 220, increasing the amount of air flowing through the heat dissipation fins 220. The air collection shrouds 240 are installed on the outside of the heat dissipation fins 220. The installation structure can reduce the interference of external debris on the heat dissipation fins 220, while ensuring that the air is concentrated on the heat dissipation fins 220.

[0040] As shown in Figure 6, it is worth noting that the first end of the air collector shroud 240 is the air inlet port 241, which is used to collect outside air and provide cooling airflow for the heat dissipation fins 220; the last end of the air collector shroud 240 is the exhaust port 242, which is used to exhaust the hot air after heat exchange with the heat dissipation fins 220, preventing hot air from accumulating inside the air collector shroud 240; the size of the air inlet port 241 is larger than the size of the exhaust port 242, and the size difference allows the air to form a certain flow velocity inside the air collector shroud 240, enhancing the cooling effect on the heat dissipation fins 220; Both the top and bottom ends of the air shroud 240 are provided with protruding edges 243. The protruding edges 243 can increase the contact area between the air shroud 240 and the brake drum 200, making it easier to fix with bolts. The protruding edges 243 are fixed to the outer surface of the brake drum 200 with bolts. The bolt fixing method can ensure that the air shroud 240 and the brake drum 200 are firmly connected and prevent the air shroud 240 from falling off when the brake drum 200 rotates. The air inlet port 241 faces the same direction as the rotation direction of the wheel. The same orientation can make the air driven by the wheel rotation enter the air inlet port 241 more smoothly and improve the air collection efficiency.

[0041] In this embodiment, the ductile iron brake drum, which combines heat dissipation grooves and fins, operates as follows: First, when the vehicle needs to brake, the brake wheel cylinder 130 hydraulically pushes the ends of the two brake shoes 110 outward, causing the brake shoes 110 to rotate around their end hinges. This causes the outer brake pads 120 to contact the inner wall of the brake drum 200, which rotates with the wheel, generating braking force through friction to decelerate or stop the vehicle. Then, during braking, some of the heat generated by the friction between the brake pads 120 and the brake drum 200 is dissipated directly outward through the heat dissipation grooves 112 on the brake shoes 110, while the other part is transferred through the brake shoes 110 to the reinforcing ribs 111, and then conducted to the heat sinks 11 by the heat-conducting plates 113. 4. Simultaneously, the convex plate 230 inside the brake drum 200 rotates with the brake drum 200, pushing the airflow and accelerating the heat dissipation of the heat sink 114. Then, the heat generated by the brake drum 200 itself is transferred to the outside air through the groove 210 and heat sink 220 on the outer periphery. The air collector shroud 240 guides the outside air to flow through the heat sink 220, further accelerating the heat dissipation speed of the brake drum 200. Finally, after braking, the brake wheel cylinder 130 is hydraulically released, and the return spring 140 pulls the ends of the two brake shoes 110 closer together through its own elastic tension, causing the brake pad 120 to separate from the inner wall of the brake drum 200. The braking system returns to its initial state, waiting for the next braking operation.

[0042] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A nodular cast iron brake drum with heat dissipation grooves and fins, comprising a chassis (100) fixedly connected with a vehicle, a pair of brake shoes (110) hingedly connected in the chassis (100), brake pads (120) mounted on the outer side surfaces of the brake shoes (110), and a brake drum (200) sleeved on the top of the chassis (100), characterized in that: The inner side surface of the brake shoe (110) is provided with a plurality of heat dissipation grooves (112), the middle position of the inner side surface of the brake shoe (110) is provided with a reinforcing rib plate (111), the reinforcing rib plate (111) is provided with a heat conducting sheet (113), the top of the heat conducting sheet (113) is integrally formed with a plurality of heat dissipation fins (114), the brake drum (200) is installed on the wheel through the hub and rotates with the wheel, a plurality of grooves (210) are formed on the outer peripheral surface of the brake drum (200), a plurality of heat dissipation fins (220) are also fixed on the outer peripheral surface of the brake drum (200), a plurality of wind collecting covers (240) are installed on the outer peripheral surface of the brake drum (200), and the wind collecting cover (240) covers the outside of the heat dissipation fin (220).

2. The spheroidal graphite cast iron brake drum with both a cooling fin and a cooling groove according to claim 1, characterized in that: The brake shoe (110) is in an arc plate structure, the heat dissipation grooves (112) are in a permeable shape, and a plurality of the heat dissipation grooves (112) are distributed in a ring array shape on the brake shoe (110) with the axis of the brake shoe (110) as the center.

3. The spheroidal graphite cast iron brake drum with both cooling grooves and fins according to claim 1, characterized in that: The heat conducting sheet (113) is in a fan ring structure and is fixed on the top surface of the reinforcing rib plate (111) through bolts, and a plurality of heat dissipation fins (114) are distributed in a ring array shape on the heat conducting sheet (113) with the axis of the heat conducting sheet (113) as the center.

4. The spheroidal graphite cast iron brake drum with both a cooling fin and a cooling groove according to claim 1, characterized in that: The end of the brake shoe (110) is hinged to the chassis (100) through a hinge shaft, a brake cylinder (130) is arranged between the first ends of the two brake shoes (110), the brake cylinder (130) is fixed on the chassis (100), and the first ends of the two brake shoes (110) abut against the first and second ends of the brake cylinder (130) respectively.

5. The spheroidal graphite cast iron brake drum with both cooling grooves and fins according to claim 1, characterized in that: A reset spring (140) is arranged between the first ends of the two reinforcing rib plates (111) of the two brake shoes (110), and the first and second ends of the reset spring (140) are in a hook shape and are hung on the two reinforcing rib plates (111) respectively.

6. The spheroidal graphite cast iron brake drum with both cooling grooves and fins according to claim 1, characterized in that: The grooves (210) and the heat dissipation fins (220) are inclined on the outer surface of the brake drum (200), and the grooves (210) and the heat dissipation fins (220) are distributed in a ring array shape on the outer peripheral surface of the brake drum (200) with the axis of the brake drum (200) as the center.

7. The spheroidal graphite cast iron brake drum with both cooling grooves and fins according to claim 1, characterized in that: A plurality of convex plates (230) are fixed in a ring array shape on the top wall inside the brake drum (200) with the axis of the brake drum (200) as the center, and the positions of the convex plates (230) correspond to the positions of the heat dissipation fins (114).

8. The spheroidal graphite cast iron brake drum with both cooling grooves and fins according to claim 1, characterized in that: The first end of the wind collecting cover (240) is an air inlet port (241), the end of the wind collecting cover (240) is an air outlet port (242), the size of the air inlet port (241) is larger than the size of the air outlet port (242), the top and bottom ends of the wind collecting cover (240) are provided with a convex edge (243), the convex edge (243) is fixed on the outer surface of the brake drum (200) through bolts, and the direction of the air inlet port (241) is the same as the rotation direction of the wheel.

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