A heat shield for automobile engines with heat and sound insulation effects

Abstract

This utility model discloses a heat insulation cover for an automobile engine with heat and sound insulation effects, including a hood. A cover frame is fixedly connected to the bottom of the hood, and a heat insulation pad is attached to the bottom edge of the hood. The heat insulation pad is made of polyether-type polyurethane heat and sound insulation foam. Inside the cover frame, from the side near the engine to the side near the hood, a high-temperature reflective layer, a high-temperature heat insulation layer, a transition layer, a damping layer, a sound-absorbing layer, and a high-density sound insulation layer are stacked in sequence, and the layers are fixedly connected by a high-temperature adhesive. Through the multi-layer material structure design, the high temperature generated by the engine is effectively isolated in the engine compartment. The design of the high-density sound insulation layer and the sound-absorbing layer greatly reduces the noise generated during engine operation. The superposition of these sound insulation and sound-absorbing layers allows engine noise to be effectively isolated and absorbed, thereby improving the comfort of the passenger compartment and reducing noise interference for the driver and passengers.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts technology, and more specifically, to a heat shield for automotive engines with heat insulation and sound insulation effects. Background Technology

[0002] The car engine is the core power system of a vehicle, responsible for generating power by burning fuel (such as gasoline, diesel, or electricity) to drive the vehicle's various functions. Engines are typically based on the internal combustion engine principle, where fuel and air are mixed and ignited in the cylinder to produce high-temperature, high-pressure gas, which drives the piston and, in turn, rotates the crankshaft. Therefore, engines tend to generate noise and heat during operation. To absorb heat from the engine compartment, reduce noise, and improve the cabin environment, engine sound and heat insulation covers are installed on car engines. However, existing automotive heat insulation covers have poor sound insulation properties, causing noise pollution to the surrounding environment and reducing user comfort. Furthermore, their poor heat insulation performance means that prolonged operation at high temperatures can lead to spontaneous combustion, posing a safety hazard. Utility Model Content

[0003] The purpose of this utility model is to provide a heat insulation and sound insulation cover for automobile engines. Through the multi-layer material structure design, it effectively isolates the high temperature generated by the engine in the engine compartment; through the design of high-density sound insulation layer and sound absorption layer, it greatly reduces the noise generated during engine operation.

[0004] The technical solution provided by this utility model is as follows: A heat insulation cover for an automobile engine with heat insulation and sound insulation effects, including a hood, a cover frame fixedly connected to the bottom of the hood, and a heat insulation pad attached to the bottom edge of the hood. The heat insulation pad is made of polyether-type polyurethane heat insulation and sound insulation foam. Inside the cover frame, from the side near the engine to the side near the hood, a high-temperature reflective layer, a high-temperature heat insulation layer, a transition layer, a damping layer, a sound-absorbing layer, and a high-density sound insulation layer are sequentially stacked, and the layers are fixedly connected by a high-temperature adhesive. The side of the high-density sound insulation layer away from the sound-absorbing layer is connected to the... The bottom of the cover fits tightly. The high-density sound insulation layer is made of lead composite board material. The sound-absorbing layer is sandwiched between the high-density sound insulation layer and the damping layer. The sound-absorbing layer is made of polyester fiber cotton. The damping layer is set between the sound-absorbing layer and the transition layer. The damping layer is made of butyl rubber damping plate material. The transition layer is located between the damping layer and the high-temperature heat-resistant insulation layer. The transition layer is made of heat-insulating cotton material. The heat-insulating cotton is glass fiber cotton or high-temperature resistant polyester cotton. The high-temperature heat-resistant insulation layer is sandwiched between the transition layer and the high-temperature reflective layer. The high-temperature heat-resistant insulation layer is made of aerogel felt material.

[0005] Preferably, the side of the high-temperature resistant reflective layer away from the high-temperature resistant heat insulation layer faces the engine, and the high-temperature resistant reflective layer is made of aluminum-plated thin film material.

[0006] Preferably, the heat insulation pad is continuously arranged around the bottom edge of the cover, and the cross-section of the heat insulation pad is trapezoidal.

[0007] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0008] 1. Through a multi-layered material structure design, the high temperatures generated by the engine are effectively isolated within the engine compartment. In particular, the high-temperature reflective layer uses an aluminum-coated thin film material, which can reflect a large amount of heat and prevent excessive heat from being transferred to the hood surface; the high-temperature insulation layer uses aerogel felt material, which has excellent heat insulation effect, significantly reducing the impact of engine high temperatures on the surrounding environment, effectively improving engine stability and extending engine life.

[0009] 2. Through the design of high-density sound insulation and sound absorption layers, the noise generated during engine operation is greatly reduced. The superposition of these sound insulation and sound absorption layers allows engine noise to be effectively isolated and absorbed, thereby improving the comfort of the cabin and reducing noise interference for the driver and passengers. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of this utility model;

[0011] Figure 2 This is a schematic diagram of the structure of the cover in this utility model;

[0012] Figure 3 This is a partial unfolded view of the structure of this utility model.

[0013] The labels in the diagram are as follows: 1. Cover; 2. Frame; 3. High-temperature resistant reflective layer; 4. High-temperature resistant heat insulation layer; 5. Transition layer; 6. Damping layer; 7. Sound-absorbing layer; 8. High-density sound insulation layer; 9. Heat insulation pad. Detailed Implementation

[0014] Example: Please refer to Figure 1-3 A heat insulation cover for an automobile engine with heat insulation and sound insulation effects includes a hood 1, a cover frame 2 fixedly connected to the bottom of the hood 1, and a heat insulation pad 9 attached to the bottom edge of the hood 1. The heat insulation pad 9 is made of polyether-type polyurethane heat insulation and sound insulation foam. The inside of the cover frame 2 is arranged in layers from the side near the engine to the side near the hood 1, including a high-temperature reflective layer 3, a high-temperature heat insulation layer 4, a transition layer 5, a damping layer 6, a sound absorption layer 7, and a high-density sound insulation layer 8, and the layers are fixedly connected by a high-temperature adhesive.

[0015] The hood 1 is the external structure of the heat shield, its function being to protect the components inside the engine compartment and provide a certain degree of physical protection. The frame 2 supports the hood 1 and other layers of the heat shield structure, ensuring each layer is securely mounted on the hood 1 while maintaining the required heat and sound insulation. The heat insulation pad 9, located at the bottom edge of the hood 1, is made of polyether-type polyurethane heat and sound insulation foam, serving a dual purpose of heat and sound insulation. Its trapezoidal cross-section effectively covers the bottom edge of the hood 1, preventing engine heat from directly transferring to the outside of the hood 1 and absorbing or reducing noise.

[0016] The high-density sound insulation layer 8 is tightly fitted to the bottom of the hood 1 on the side away from the sound absorption layer 7. The high-density sound insulation layer 8 is made of lead composite board material. The sound absorption layer 7 is sandwiched between the high-density sound insulation layer 8 and the damping layer 6. The sound absorption layer 7 is made of polyester fiber cotton. The damping layer 6 is set between the sound absorption layer 7 and the transition layer 5. The damping layer 6 is made of butyl rubber damping plate material. The transition layer 5 is located between the damping layer 6 and the high-temperature heat insulation layer 4. The transition layer 5 is made of heat insulation cotton material, which is either glass fiber cotton or high-temperature resistant polyester cotton. The high-temperature heat insulation layer 4 is sandwiched between the transition layer 5 and the high-temperature reflective layer 3. The high-temperature heat insulation layer 4 is made of aerogel felt material. The side of the high-temperature reflective layer 3 away from the high-temperature heat insulation layer 4 faces the engine. The high-temperature reflective layer 3 is made of aluminum-plated film material. The heat insulation pad 9 is continuously wrapped around the bottom edge of the hood 1, and the cross-section of the heat insulation pad 9 is trapezoidal.

[0017] The high-temperature reflective layer 3, made of aluminized film, is located on the side closest to the engine. It reflects high temperatures, preventing heat generated by the engine from dissipating outwards through the hood 1. The aluminized film has excellent heat reflection properties, effectively reducing heat transfer to other layers and mitigating the risk of increased surface temperature on the hood 1. The high-temperature insulation layer 4 is made of aerogel felt. Aerogel has extremely low thermal conductivity, effectively blocking heat conduction and maintaining a stable temperature inside the engine compartment. The choice of aerogel felt improves the durability and insulation effect of the heat shield in high-temperature environments. The transition layer 5, located between the high-temperature insulation layer 4 and the damping layer 6, is made of insulating cotton (such as fiberglass or high-temperature resistant polyester). This layer provides additional insulation and helps alleviate thermal stress differences between different materials, enhancing the overall structural stability. The damping layer 6 is made of butyl rubber damping plate, primarily used to reduce vibration and noise. Butyl rubber has excellent damping properties, effectively absorbing mechanical vibrations and noise generated during engine operation, further improving the comfort of the vehicle interior. The sound-absorbing layer 7, sandwiched between the high-density sound insulation layer 8 and the damping layer 6, is made of polyester fiber cotton. The function of the sound-absorbing layer 7 is to absorb and reduce engine noise, improving the quietness of the vehicle interior. Polyester fiber cotton has excellent sound wave absorption properties, effectively reducing the propagation of high-frequency noise. The high-density sound insulation layer 8, made of lead composite board, is located at the bottom closest to the hood 1. Lead composite board is a high-density sound insulation material that effectively isolates and reduces sound wave propagation, further improving the sound insulation effect in the engine compartment. This layer is tightly fitted to the bottom of the hood 1, directly isolating engine noise and reducing noise pollution inside the vehicle.

[0018] Working principle of this utility model:

[0019] During engine operation, the engine generates a large amount of heat. Through a layered design of multiple materials, the high temperatures generated by the engine can be effectively insulated, preventing them from affecting the hood 1 and surrounding components. High-temperature reflective layer 3: This aluminized film high-temperature reflective layer 3 is located closest to the engine and has strong heat reflection capabilities, reflecting a large amount of heat and preventing direct heat transfer to the surface of the hood 1. High-temperature insulation layer 4: Located between the reflective layer and the transition layer 5, this aerogel felt material has excellent heat insulation properties, significantly reducing heat transfer and protecting the surrounding environment from high temperatures. Transition layer 5 and heat insulation pad 9: The transition layer 5 uses heat insulation cotton (such as fiberglass cotton or high-temperature resistant polyester cotton) to effectively regulate temperature changes, while the heat insulation pad 9 at the bottom of the hood 1 uses polyether-type polyurethane foam, adhered to the bottom edge to form a trapezoidal heat insulation structure, further isolating heat.

[0020] During operation, the engine generates not only high temperatures but also significant noise. The design of the high-density sound insulation layer 8 and the sound-absorbing layer 7 effectively isolates and absorbs this engine noise. The high-density sound insulation layer 8, made of lead composite board material, has high density and excellent sound insulation performance, effectively reducing the propagation of engine noise. The sound-absorbing layer 7, sandwiched between the high-density sound insulation layer 8 and the damping layer 6, uses polyester fiber cotton material, effectively absorbing noise, reducing noise interference inside the passenger compartment, and improving passenger comfort.

[0021] 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 heat insulation and sound insulation cover for an automobile engine, comprising a hood (1), characterized in that: The bottom of the hood (1) is fixedly connected to a frame (2). A heat insulation pad (9) is attached to the bottom edge of the hood (1). The heat insulation pad (9) is made of polyether-type polyurethane heat insulation and sound insulation foam. The inside of the frame (2) is arranged in layers from the side near the engine to the side near the hood (1): a high-temperature reflective layer (3), a high-temperature heat insulation layer (4), a transition layer (5), a damping layer (6), a sound-absorbing layer (7), and a high-density sound insulation layer (8). The layers are fixedly connected by a high-temperature adhesive. The side of the high-density sound insulation layer (8) away from the sound-absorbing layer (7) is tightly attached to the bottom of the hood (1). The sound-absorbing layer (7) is sandwiched between the high-density sound insulation layer (8) and the damping layer (6) using lead composite board material. The sound-absorbing layer (7) is made of polyester fiber cotton. The damping layer (6) is set between the sound-absorbing layer (7) and the transition layer (5). The damping layer (6) is made of butyl rubber damping board material. The transition layer (5) is located between the damping layer (6) and the high-temperature heat-resistant insulation layer (4). The transition layer (5) is made of heat-insulating cotton material, which is glass fiber cotton or high-temperature resistant polyester cotton. The high-temperature heat-resistant insulation layer (4) is sandwiched between the transition layer (5) and the high-temperature reflective layer (3). The high-temperature heat-resistant insulation layer (4) is made of aerogel felt material.

2. The heat insulation and sound insulation cover for an automobile engine according to claim 1, characterized in that: The high-temperature resistant reflective layer (3) is positioned with the side away from the high-temperature resistant heat insulation layer (4) facing the engine, and the high-temperature resistant reflective layer (3) is made of aluminum-plated thin film material.

3. A heat insulation and sound insulation cover for an automobile engine according to claim 1, characterized in that: The heat insulation pad (9) is continuously arranged around the bottom edge of the cover (1), and the cross-section of the heat insulation pad (9) is trapezoidal.

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