A housing for an automotive fan

Abstract

The utility model relates to the technical field of automobile fan shell, disclose a kind of shell for automobile fan, including integrally formed upper shell and lower shell, upper shell and lower shell sealing connection form internal mounting cavity;The shell includes: motor interface area at first end, for connecting fan motor;Misplaced wire harness outlet structure at second end, for optimizing wire harness wiring path and reducing electromagnetic interference;Symmetrical ventilation guide groove structure is arranged along the length direction of shell, for guiding air flow to realize shell heat dissipation.The utility model solves the technical problem of insufficient assembly alignment and sealing of existing shell, increased wire harness outlet stress and electromagnetic interference and low heat dissipation efficiency.

Description

Technical Field

[0001] This utility model relates to the field of automotive fan technology, specifically to a housing for an automotive fan. Background Technology

[0002] Currently, automotive cooling systems widely employ electric fan structures, where the fan motor is typically fixed to the vehicle platform via a housing. The fan housing must not only possess sufficient structural strength to support the motor's weight and operational vibrations, but also accommodate wiring harness routing, electromagnetic shielding, and heat dissipation under high-temperature conditions. Existing technologies often employ an upper and lower housing assembly structure for fan housings, but this design frequently presents the following problems: Firstly, in terms of the housing assembly structure, conventional designs do not effectively limit the assembly alignment and sealing, which makes it easy for misalignment or poor sealing to occur at the housing connection position, thereby affecting the dustproof and waterproof performance of the fan system under complex working conditions and reducing overall reliability. Secondly, regarding the motor wiring harness lead-out structure, traditional fan housings mostly adopt a straight lead-out method, which does not fully consider the vehicle space layout and the stress problem under the movement of the wiring harness. This can easily lead to bending fatigue at the root of the wiring harness or increased electromagnetic interference, posing a safety hazard. Utility Model Content

[0003] The purpose of this invention is to provide a housing for an automotive fan to solve the problems mentioned in the background art.

[0004] To solve the above-mentioned technical problems, this utility model provides a housing for an automotive fan, including an integrally formed upper housing and a lower housing, which are sealed together to form an internal mounting cavity. The housing includes: a motor interface area at a first end for connecting a fan motor; a staggered wiring harness outlet structure at a second end for optimizing the wiring harness routing path and reducing electromagnetic interference; and a symmetrical ventilation guide groove structure arranged along the length of the housing for guiding airflow to achieve heat dissipation of the housing.

[0005] In one possible implementation, the misaligned harness outlet structure includes an inclined outlet hole and an internal guide step, the guide step being used to limit harness torsion and reduce harness stress concentration.

[0006] In one possible implementation, the symmetrical ventilation guide groove is a plurality of parallel grooves with a semi-arc cross-section. The grooves penetrate the shell wall and are used to form a convection ventilation channel.

[0007] In one possible implementation, the upper housing and the lower housing are provided with an annular limiting boss and groove mating structure on the joint surface to limit the assembly direction and improve the sealing performance.

[0008] In one possible implementation, the motor interface area is provided with a coaxial positioning post and an outwardly protruding reinforcing rib, the reinforcing rib being used to increase the mechanical strength and vibration resistance of the connection.

[0009] In one possible implementation, the housing includes at least four universal mounting holes distributed at the corners, with grounded conductive surfaces at the edges of the mounting holes, which, when tightened with screws, form a grounded electromagnetic shielding circuit.

[0010] In one possible implementation, the edge of the mounting hole is treated with electroless nickel plating to form a conductive layer, which is used to enhance the overall electromagnetic compatibility performance of the housing.

[0011] In one possible implementation, the housing is integrally die-cast from aluminum alloy, with an outer surface coated with an epoxy resin coating that provides corrosion resistance and radiation shielding. The bottom is provided with an installation and positioning platform for docking with the automotive fan mounting base.

[0012] Compared with the prior art, the beneficial effects of this utility model are: This utility model provides a housing for an automotive fan. Structurally, the upper and lower housings are integrally formed and sealed together, forming a stable and reliable internal mounting cavity, which is beneficial to improving structural strength and sealing performance. By setting motor interface areas and staggered wiring harness outlet structures at both ends of the housing, stable motor installation is achieved, the wiring harness lead-out path is optimized, and the risk of wiring harness torsional stress and electromagnetic interference is reduced. The symmetrical ventilation guide groove structure arranged along the length of the housing can guide airflow to form convection ventilation, improve the housing heat dissipation efficiency, and enhance the thermal stability of the system.

[0013] In addition, the mating surfaces of the upper and lower housings are equipped with a limiting boss and groove mating structure, which helps to improve assembly accuracy and enhance connection sealing. The motor interface area is equipped with reinforcing ribs and positioning post structures, which can enhance the vibration resistance and mechanical strength of the motor connection. Multiple universal mounting holes at the corners of the housing have grounding and conductivity functions, and the electromagnetic compatibility performance of the housing is further improved through chemical nickel plating, meeting the EMC requirements of automotive electronic control systems. The overall material is made of die-cast aluminum alloy, supplemented with an epoxy resin coating with excellent anti-corrosion and shielding properties, which can effectively improve the environmental adaptability and electromagnetic shielding capability of the housing.

[0014] In summary, the automotive fan housing provided by this utility model can effectively improve product reliability, electromagnetic compatibility performance, and assembly efficiency while achieving electrical connection, structural fixation, and thermal management. It is suitable for the structural integration and environmental adaptability requirements of high-performance fan components in modern automotive cooling systems. Attached Figure Description

[0015] Figure 1 This is the front view of the present invention; Figure 2 This is a schematic diagram of the upper and lower housings of this utility model. Figure 3 This is the left view of the present invention; Figure 4 This is a partially enlarged view of the lower shell of this utility model.

[0016] In the diagram: 1. Upper housing; 2. Lower housing; 3. Motor interface area; 4. Offset wire harness outlet structure; 5. Mounting holes; 6. Limiting boss; 7. Symmetrical ventilation guide channel structure; 8. Reinforcing rib; 9. Installation positioning platform; 10. Guide step. Detailed Implementation

[0017] 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.

[0018] Please see Figures 1 to 4The automotive fan housing is a one-piece structure consisting of two housings, upper housing 1 and lower housing 2, which are integrally die-cast using a mold. During the molding process, a unified mold cavity design allows upper housing 1 and lower housing 2 to be formed into a single structure in the same process step. This eliminates the deformation problems caused by multi-segment splicing in traditional split housings, improving overall structural strength and dimensional accuracy. Upper housing 1 and lower housing 2 are connected by a circumferential sealing structure. This sealing connection uses a boss and groove mating structure on the joint surface for limiting and positioning, achieving a tight seal at the housing joint surface. Combined with evenly distributed screw holes around the perimeter for mechanical fixation, this creates a stable, enclosed space within the mounting cavity, providing excellent dustproof and waterproof sealing capabilities. The first end of the housing is provided with a motor interface area 3. This area is pre-set with positioning holes and fixing holes that match the installation dimensions of the fan motor. The positioning holes are coaxial cylindrical structures used to insert the motor output shaft and perform coaxial alignment to ensure that the axis of the motor output shaft coincides with that of the fan shaft. The fixing holes are located around the interface and are evenly distributed to achieve a firm fixation of the motor by screw installation. In addition, the mounting surface of the motor interface area 3 is designed as a flat surface or a reinforcing rib structure according to the shape of the motor base to improve the strength of the connection surface and the vibration resistance. The second end of the housing is provided with a staggered wire harness outlet structure 4. This structure specifically includes an outlet hole and a guide structure on its inner wall. The outlet hole is arranged on the housing wall at a position not on the same central axis as the motor interface, that is, it is opened in a planar staggered manner to form spatial separation, effectively preventing the wire harness from directly passing through the motor magnetic field area and reducing the impact of electromagnetic interference. The guide structure is a stepped surface 10 injection molded on the inner wall of the outlet hole. The height of the stepped surface decreases step by step along the wire harness path direction to form an arc-shaped guide ramp, which is used to guide the wire harness to smoothly exit from the inside of the housing to the outside, and to support and limit the wire harness at the step to prevent the wire harness from being damaged by twisting, squeezing or stress concentration during operation. Along the length of the housing, from the motor interface area to the wiring harness outlet, symmetrical ventilation guide groove structures 7 are arranged on the left and right sides of the housing. These structures consist of multiple parallel semi-circular grooves, which are simultaneously die-cast into the outer wall of the housing using a mold cavity. The cross-section of the grooves is fixed as a semi-circular arc, with fixed parameters for radius of curvature, groove depth, and groove width. Typical dimensions are a width of 5mm and a depth of 2.5mm. These grooves penetrate the outer wall of the housing without penetrating the inner cavity, forming a flow channel on the outer surface of the housing. When the fan is running, ambient air flows along these guide grooves under the drive of the fan impeller, thereby accelerating the air convection heat dissipation efficiency on the housing surface, reducing the housing temperature rise, and improving the operational stability of the motor and internal components of the housing. As a preferred embodiment, the misaligned wire harness outlet structure 4 includes an inclined wire outlet hole and a guide step 10 disposed on the inner wall of the outlet hole. The inclined wire outlet hole is opened at a set angle at the second end of the housing 2. This angle is set at a fixed angle (e.g., 30°) relative to the housing axis to ensure that the wire harness can bend in a predetermined direction and avoid the main magnetic field area of ​​the motor after exiting the inner cavity. The guide step 10 is integrally die-cast inside the outlet hole through a mold core structure. Its cross-section is a stepped platform, and multiple step structures are provided along the wire exit direction. The width and height of each step decrease, with typical dimensions of 3mm width and 1.5mm height. It plays a role in segmented guidance and stress buffering, which can effectively limit the twisting path of the wire harness, reduce the local stress concentration generated by the wire harness under long-term vibration or temperature rise, and improve the mechanical stability and service life of the wire harness outlet structure.

[0019] As a preferred example, the symmetrical ventilation guide channel 7 structure consists of multiple parallel grooves. The cross-section of each groove is fixed at a semi-circular shape and is integrally formed onto the outer wall of the housing during die casting using a mold core design. The longitudinal direction of each groove is consistent with the length of the housing, symmetrically distributed on both sides. The groove spacing is uniformly 10mm, the groove depth is 3mm, and the width is 6mm. The number of grooves is determined based on the total length of the housing, typically 4 to 6. The grooves extend throughout the entire length of the housing, from the motor interface area 3 to the misaligned wiring harness outlet area 4, without penetrating the housing cavity. They only form a convection heat conduction path on the outside of the housing wall, thus creating a stable airflow channel. When the fan is running, the airflow is accelerated by the guide channels, significantly improving the housing's heat dissipation capacity.

[0020] As a preferred embodiment, an annular limiting boss 6 and a corresponding groove are provided between the mating surfaces of the upper housing 1 and the lower housing 2. This structure forms a closed ring by setting corresponding areas of the male and female molds in the mold. The limiting boss 6 is formed at the edge of the mating surface of the lower housing 2, with a boss width of 2mm and a height of 1.5mm; the corresponding groove is set at the same position on the mating surface of the upper housing 1, with a groove depth of 1.5mm and a groove width of 2mm, ensuring that the two are completely fitted. This structure is used to clarify the assembly direction, prevent rotational misalignment during assembly, and form precise positioning during mating. At the same time, it enhances the clamping force of the sealing ring or gasket, improving the overall sealing performance and mechanical connection reliability of the housing.

[0021] As a preferred embodiment, the motor interface area 3 is equipped with a coaxial positioning post and an outwardly protruding reinforcing rib 8. The positioning post is located at the center of the interface area, with a diameter matching the size of the fan motor output shaft hole (e.g., φ8mm) and a height of 5mm. This ensures that the output shaft is strictly aligned with the fan's center hole during motor installation, preventing eccentric vibration. The outwardly protruding reinforcing rib 8 is a rib structure distributed radially along the circumference of the motor interface. The rib thickness is 3mm, and the length extends to the outer edge of the motor mounting area. There are 4 to 6 ribs in total, which serve to support and reinforce the motor, dispersing the vibration stress and installation torque brought by the motor during fan operation, improving the mechanical strength of the interface, and preventing deformation or cracking during long-term operation.

[0022] As a preferred embodiment, the housing has at least four mounting holes 5, evenly distributed at the corners of the upper housing 1 and the lower housing 2. These mounting holes are M6 standard holes, with flat, pressure-pressing surfaces at their edges. The surfaces of these holes undergo roughness control and flatness processing to ensure conductivity with the screw contact surface. Each mounting hole 5 has a grounding conductive surface at its edge. This conductive surface is the exposed metal substrate after the coating has been removed. During assembly, it is pressed against the vehicle chassis ground wire by screws, achieving grounding connection between the housing and the vehicle's electrical system. This forms an electromagnetic shielding loop, effectively guiding high-frequency interference current to the ground wire and improving the system's electromagnetic compatibility.

[0023] As a preferred embodiment, the edge of mounting hole 5 is treated with electroless nickel plating to form a conductive layer. The thickness of this conductive layer is controlled between 5 and 10 μm, and its surface resistivity is less than 0.01 Ω, exhibiting excellent conductivity and corrosion resistance. This conductive layer covers the surface of the grounding contact area and ensures that its conductivity will not decrease due to oxidation or corrosion during long-term use. The presence of this conductive layer further enhances the overall electromagnetic compatibility performance of the housing, effectively shielding external electromagnetic radiation and suppressing the outward radiation of electromagnetic interference generated by electronic equipment within the housing.

[0024] As a preferred option, the housing is entirely die-cast from aluminum alloy, specifically ADC12 or an equivalent aluminum-silicon alloy. This material possesses excellent formability, thermal conductivity, and corrosion resistance. High-pressure die-casting is used during the molding process to ensure structural density. After molding, the surface is cleaned and coated with an epoxy resin layer, with a thickness controlled between 50 and 80 μm, providing corrosion resistance. Conductive powder is also incorporated to enhance its electromagnetic shielding performance. The bottom of the housing features a mounting platform 9, a rectangular raised surface whose dimensions perfectly match the mating dimensions of the automotive fan mounting base. The surface is smoothly machined and used to position and fix the relative position between the housing and the automotive fan, preventing misalignment or wobbling during assembly and ensuring stable fan installation. Working Principle: The automotive fan housing is integrally die-cast from upper and lower shells. The upper and lower shells are sealed together by a limiting fit structure, forming a closed internal mounting cavity. This cavity houses and protects the automotive fan motor and its associated components. The motor interface area features coaxial positioning posts for motor mounting and reinforcing ribs for reinforcement. The positioning posts ensure precise coaxial alignment between the motor output shaft and the fan shaft, preventing operational misalignment and improving rotational stability. The reinforcing ribs provide structural support to the mounting area, enhancing seismic resistance and ensuring connection strength under high-frequency vibration and long-term loads.

[0025] The second end of the housing is equipped with a staggered wire harness outlet structure. This structure, by positioning the outlet hole off-axis, prevents the wire harness from directly passing through the main magnetic field region of the motor, thereby reducing the risk of electromagnetic interference caused by magnetic field disturbances. Simultaneously, a guide step structure is formed within the outlet hole. Each step guides the wire harness out smoothly, preventing problems such as excessive twisting, bending, or stress concentration, thus ensuring the mechanical reliability and electrical stability of the wire harness connection.

[0026] To achieve the heat dissipation function of the housing, multiple longitudinal ventilation channels are symmetrically arranged on the left and right sides of the housing exterior. Each channel is a semi-circular groove structure with a fixed cross-section. This structure is consistent with the airflow direction. When the fan operates and drives the surrounding air to circulate, these channels form a convection channel on the housing surface, which can accelerate the dissipation of heat from the housing surface to the external environment, achieve efficient heat dissipation, and reduce the temperature rise of the housing and the internal motor.

[0027] Multiple standard-sized mounting holes are provided at the four corners or edges of the housing. The edges of the holes have conductive ground planes, which are electroplated with nickel to form a stable conductive layer. During assembly, these mounting holes are pressed into the mounting base of the automotive fan with screws, forming good electrical contact through the grounded conductive surface, effectively grounding the housing. This constructs a complete electromagnetic shielding circuit, shielding external interference sources and guiding internal high-frequency interference current to safely discharge to ground, thus improving electromagnetic compatibility.

[0028] In addition, to adapt to the structural requirements of the automotive fan base, an installation and positioning platform is set at the bottom of the housing. The surface of the platform is precision machined and its dimensions match the base, enabling rapid positioning and assembly. The entire housing is integrally formed using an aluminum alloy die-casting process and coated with an epoxy resin coating. This coating has anti-corrosion capabilities and certain electromagnetic shielding characteristics, providing long-term protection and stable shielding effects under harsh working conditions, further ensuring the reliable operation of the automotive fan system under multiple stress environments such as thermal, electrical, mechanical, and electromagnetic interference.

[0029] As described above, although the present invention has been shown and described with reference to specific preferred embodiments, it should not be construed as limiting the present invention itself. Various changes in form and detail may be made to the present invention without departing from the spirit and scope of the appended claims.

Claims

1. A housing for an automotive fan, characterized by, It includes an integrally formed upper housing (1) and a lower housing (2), which are sealed together to form an internal mounting cavity. The housing includes: The motor interface area (3) located at the first end is used to connect the fan motor; The staggered wire harness exit structure (4) located at the second end is used to optimize the wire harness wiring path and reduce electromagnetic interference; A symmetrical ventilation guide channel structure (7) is provided along the length of the shell to guide airflow and achieve heat dissipation of the shell.

2. The housing for an automotive fan according to claim 1, characterized in that, The misaligned wire harness outlet structure (4) includes an inclined outlet hole and an internal guide step (10), which is used to limit the twisting of the wire harness and reduce the stress concentration of the wire harness.

3. The housing for an automotive fan according to claim 1, characterized in that, The symmetrical ventilation guide structure (7) consists of multiple parallel grooves with a semi-arc cross-section. The grooves penetrate the shell wall and are used to form a convection ventilation channel.

4. The housing for an automotive fan according to claim 1, characterized in that, The upper housing (1) and the lower housing (2) are provided with an annular limiting boss (6) and a groove matching structure on the joint surface, which are used to limit the assembly direction and improve the sealing performance.

5. The housing for an automotive fan according to claim 1, characterized in that, The motor interface area (3) is provided with a coaxial positioning post and an outwardly protruding reinforcing rib (8). The reinforcing rib (8) is used to increase the mechanical strength and vibration resistance of the connection.

6. The housing for an automotive fan according to claim 1, characterized by The housing includes at least four universal mounting holes (5) distributed at the corners. The edges of the mounting holes (5) are provided with grounded conductive surfaces, which form a grounded electromagnetic shielding circuit after being pressed with screws.

7. The housing for an automotive fan according to claim 6, characterized by The edge of the mounting hole (5) is formed with a conductive layer by chemical nickel plating, which is used to enhance the overall electromagnetic compatibility performance of the housing.

8. The housing for an automotive fan according to claim 1, characterized in that, The housing is made of die-cast aluminum alloy and coated with an epoxy resin coating that has anti-corrosion and radiation shielding functions on the outer surface. The bottom is provided with an installation and positioning platform (9) for docking with the car fan mounting base.

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