Automotive electronic unit housing

Abstract

An automobile electronic unit shell includes an upper shell and a lower shell, a flange is arranged around the periphery of the lower shell, a sealing groove is arranged on the upper shell and seals with the first flange, a sealing element is arranged between the flange and the sealing groove, the sealing element is a first sealing ring sleeved on the top of the flange, a second sealing ring is arranged on the first sealing ring, and an elastic lug is arranged on the top of the second sealing ring and abuts against the inner wall of the sealing groove. Through the design of the double-layer composite sealing ring structure, when the automobile electronic unit shell is fastened and folded by bolts, the elastic lug and the middle arc surface of the top of the outer second sealing ring can abut against the sealing groove in multiple points and multiple surfaces with high interference, which cooperates with the rigid-flexible cooperation restriction of the inner first sealing ring and the limiting gasket, effectively solves the problems of local sealing loosening and water vapor penetration caused by external violent vibration or material temperature difference aging of the traditional shell, and greatly improves the working safety and durability of the vehicle electronic element.

Description

Technical Field

[0001] This utility model relates to a housing for an automotive electronic unit, belonging to the field of automotive parts. Background Technology

[0002] With the increasing level of automotive electronics, various automotive electronic control units (ECUs) are being used more and more widely in vehicles. As a barrier protecting the core electronic components inside, the sealing performance of the automotive ECU housing directly affects the operational stability and service life of the ECU. During driving, vehicles face harsh external environments such as bumps, alternating high and low temperatures, and humidity and mud, which places extremely high technical demands on the sealing structure of the housing.

[0003] However, traditional automotive electronic unit housings typically use simple flat rubber gaskets or single-layer sealing rings for compression sealing. During actual assembly and long-term use, uneven stress on external fasteners or aging and shrinkage of the rubber material under drastic temperature changes can easily lead to localized loosening or elastic fatigue of the single sealing contact surface. This allows external moisture and dust to seep into the housing through the gaps, causing short circuits or corrosion failure of internal electronic components. Therefore, there is an urgent need to improve existing technologies to solve the problems of sealing failure and low reliability of traditional automotive electronic unit housings under complex operating conditions. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings and deficiencies of the existing technology and to provide an automotive electronic unit housing.

[0005] An automotive electronic unit housing includes an upper housing and a lower housing. The lower housing has a raised edge around its outer periphery. The upper housing has a sealing groove that seals with the raised edge. A sealing element is provided between the raised edge and the sealing groove. The sealing element is a first sealing ring fitted on the top of the raised edge. A second sealing ring is provided on the first sealing ring. The top of the second sealing ring has an elastic protrusion that abuts against the inner wall of the sealing groove.

[0006] Preferably, the elastic protrusions are symmetrically arranged on both sides of the second sealing ring, and the top of the elastic protrusions is press-fitted with the inner wall of the sealing groove to form a sealing connection.

[0007] Furthermore, the bottom of the first sealing ring is provided with a protruding limiting part, and the bottom of the second sealing ring extends to the limiting part and is limited and connected thereto, so that the second sealing ring covers the outside of the first sealing ring.

[0008] Preferably, the bottom of the second sealing ring is constricted, and the middle part of the second sealing ring is protruding arc and abuts against the inner wall of the sealing groove.

[0009] Furthermore, a limiting gasket is provided between the first sealing ring and the second sealing ring, the limiting gasket being used to limit the elastic deformation of the first sealing ring.

[0010] Preferably, the upper housing and the lower housing are fixedly connected by bolts.

[0011] Furthermore, a mounting cavity is formed between the upper housing and the lower housing, and the mounting cavity is used to mount electronic components.

[0012] The utility model has significant advantages: by setting a double-layer sealing element composed of a first sealing ring and a second sealing ring between the convex edge of the lower housing and the sealing groove of the upper housing, multiple sealing barriers are constructed inside and outside; the elastic protrusion at the top of the second sealing ring undergoes elastic deformation under the pressure of the inner wall of the sealing groove of the upper housing during assembly, forming a high-pressure sealing contact surface, which can effectively offset the gap changes caused by housing machining tolerances or uneven bolt tightening force; at the same time, the double-ring design can slow down the erosion rate of external moisture and aging media on the inner first sealing ring. Even if the outer contact surface experiences minor wear, the inner first sealing ring can still maintain a stable sealing and cutting function, thereby significantly improving the sealing durability and overall protection level of the automotive electronic unit under long-term vibration and temperature difference environments. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, obtaining other drawings based on these drawings without creative effort still falls within the scope of this utility model.

[0014] Figure 1 This is a schematic diagram of the overall structure of an automotive electronic unit housing according to the present invention.

[0015] Figure 2 This is a cross-sectional view of the present invention.

[0016] Figure 3 for Figure 2 A magnified view of a portion of point A in the middle.

[0017] In the figure, 100 is the upper housing; 110 is the sealing groove; 120 is the mounting cavity; 200 is the lower housing; 210 is the protruding edge; 300 is the first sealing ring; 310 is the limiting part; 400 is the second sealing ring; 410 is the elastic protrusion; 500 is the limiting gasket; and 600 is the bolt. Detailed Implementation

[0018] To make the objectives, technical solutions and advantages of this utility model clearer, the utility model will be described in further detail below with reference to the accompanying drawings.

[0019] It should be noted that all uses of "first" and "second" in the embodiments of this utility model are for the purpose of distinguishing two entities or parameters with the same name but different names. It is clear that "first" and "second" are only for the convenience of expression and should not be construed as limiting the embodiments of this utility model. Subsequent embodiments will not explain this in detail.

[0020] The directional and positional terms used in this utility model, such as "up," "down," "front," "back," "left," "right," "inner," "outer," "top," "bottom," and "side," are merely for reference to the accompanying drawings. Therefore, the directional and positional terms used are for the purpose of explaining and understanding this utility model, and not for limiting the scope of protection of this utility model.

[0021] This application provides an automotive electronic unit housing, such as... Figures 1 to 3 As shown: It includes an upper housing 100 and a lower housing 200. The lower housing 200 is surrounded by a protruding edge 210. The upper housing 100 is provided with a sealing groove 110 that seals with the protruding edge. A sealing element is provided between the protruding edge 210 and the sealing groove 110. The sealing element is a first sealing ring 300 sleeved on the top of the protruding edge 210. A second sealing ring 400 is provided on the first sealing ring 300. The top of the second sealing ring 400 is provided with an elastic protrusion 410 that abuts against the inner wall of the sealing groove 110.

[0022] The upper housing 100 and the lower housing 200 are fastened together by external fasteners. The sealing groove 110 is an annular groove with a downward opening, and its groove width is adapted to the thickness of the convex edge 210 on the outer periphery of the lower housing 200.

[0023] When the upper and lower shells are closed, the elastic protrusion 410 deforms under pressure in the lateral and vertical directions, tightly fitting against the bottom plane and inner wall of the sealing groove 110, forming the first seal. This composite structure with double-ringed casing and elastic protrusion 410 on top can transform a single surface contact seal into a multi-point, multi-faceted barrier. By utilizing the elastic restoring force independently accumulated between the two rings, it can attenuate the chaotic high-frequency vibrations transmitted by the vehicle body in multiple stages, preventing gaps from forming at the sealing interface during resonance.

[0024] The present invention further proposes that the elastic protrusions 410 are symmetrically arranged on both sides of the second sealing ring 400, and the top of the elastic protrusions 410 is interference-fitted with the inner wall of the sealing groove 110 to form a sealing connection.

[0025] The symmetrically arranged elastic protrusions 410 are located at the left and right edges of the cross-section of the second sealing ring 400, protruding towards the inner and outer groove walls of the sealing groove 110, respectively. Specifically, when the upper housing 100 presses down on the lower housing 200, the elastic protrusions 410 on both sides exert a strong physical interference fit with the inner walls of the sealing groove 110, causing the elastic material to contract and rebound towards the center. Due to the symmetrical design, the lateral compressive forces generated in the left and right directions are balanced, which can automatically correct the central axis position of the second sealing ring 400 and the inner first sealing ring 300, preventing the seal from tilting to one side or twisting and overturning when under pressure during assembly.

[0026] The present invention further proposes that the bottom of the first sealing ring 300 is provided with a protruding limiting part 310, and the bottom of the second sealing ring 400 extends to the limiting part 310 and is limited and connected thereto, so that the second sealing ring 400 covers the outside of the first sealing ring 300.

[0027] The limiting part 310 is an annular stepped structure extending horizontally outward from the base of the first sealing ring 300. Specifically, the overall inner wall contour of the second sealing ring 400 precisely matches the outer wall contour of the first sealing ring 300, and its skirt extends to the lowest point and snaps or abuts against the stepped surface of the limiting part 310. During assembly, the upper housing 100 descends to apply downward frictional and compressive forces to the second sealing ring 400, and the limiting part 310 provides rigid blocking support for the second sealing ring 400 from the bottom, preventing the second sealing ring 400 from sliding upward and dislodging along the surface of the first sealing ring 300 or generating axial stacking wrinkles under external friction.

[0028] As an alternative embodiment, those skilled in the art can also design interlocking dovetail groove structures at the contact surfaces of the limiting part 310 and the second sealing ring 400 to achieve a stronger anti-shear and anti-disengagement locking effect.

[0029] The present invention further proposes that the bottom of the second sealing ring 400 is constricted, and the middle part of the second sealing ring 400 is protruding arc and abuts against the inner wall of the sealing groove 110.

[0030] In the locked state of the shell, the protruding arc in the middle is forcibly flattened under the restriction of the groove wall, forming a surface abutment band with a certain width.

[0031] The engagement between the central arc surface and the top elastic protrusion 410 forms a stepped, progressive sealing band in the longitudinal direction, extending the fatigue life of the sealing rubber and perfectly adapting to the displacement of the housing caused by thermal expansion and contraction, ensuring that the seal does not loosen. As an alternative embodiment, those skilled in the art can also smoothly transition the central protruding arc surface into a polygonal ridge with multiple micro-sections to achieve a similar purpose of dispersing pressure.

[0032] The present invention further proposes that a limiting gasket 500 is provided between the first sealing ring 300 and the second sealing ring 400, and the limiting gasket 500 is used to limit the elastic deformation of the first sealing ring 300.

[0033] The limiting gasket 500 is preferably made of high-hardness engineering plastic or stainless steel sheet and is sandwiched between the outer wall of the first sealing ring 300 and the inner wall of the second sealing ring 400. Specifically, during the forceful tightening of the bolt 600, the downward pressure of the upper housing 100 causes the entire sealing assembly to bear a huge vertical load. Under pressure, the inner first sealing ring 300 tends to expand excessively outward and its volume expands laterally. The presence of the limiting gasket 500 acts as a rigid constraint wall, firmly limiting the excessive outward deformation of the first sealing ring 300 due to overload from the outside, and strictly controlling the deformation of the first sealing ring 300 within the preset safe elastic-plastic range. This effectively prevents the first sealing ring 300 from irreversible fatigue damage or crushing due to excessive plastic deformation. At the same time, the limiting gasket 500 converts part of the vertical pressure from above into a reaction force on the top of the convex edge 210 of the lower housing, ensuring that the contact pressure of the inner main sealing interface is always maintained at a constant high pressure, thereby ensuring the long-term ultra-high airtightness of the system.

[0034] The present invention further proposes that the upper shell 100 and the lower shell 200 are fixedly connected by bolts 600.

[0035] The upper housing 100 and the lower housing 200 are symmetrically provided with several bolt holes on their edges, and bolts 600 pass through the bolt holes to rigidly lock the two together. The continuous mechanical locking force provided by the bolts 600 keeps the first sealing ring 300 and the second sealing ring 400 in the designed pre-tight compression state for a long time, preventing the housing gaps from cracking instantly under the action of external force.

[0036] The present invention further proposes that a mounting cavity 120 is formed between the upper housing 100 and the lower housing 200, and the mounting cavity 120 is used to mount electronic components.

[0037] The mounting cavity 120 is a sealed hollow chamber formed by aligning and joining the concave cavities of the upper housing 100 and the lower housing 200. Specifically, key electronic components such as the vehicle's integrated circuit boards and sensor core microchips are securely mounted within the mounting cavity 120.

[0038] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the claims of the present utility model shall still fall within the scope of the present utility model.

[0039] Although the present invention has been described with reference to several specific embodiments, it should be understood that the present invention is not limited to the specific embodiments disclosed. The present invention is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims

1. A housing for an automotive electronic unit, characterized in that: The device includes an upper housing and a lower housing. The lower housing is surrounded by a raised edge, and the upper housing is provided with a sealing groove that seals with the raised edge. A sealing element is provided between the raised edge and the sealing groove. The sealing element is a first sealing ring fitted on the top of the raised edge. A second sealing ring is provided on the first sealing ring, and an elastic protrusion abuts against the inner wall of the sealing groove on the top of the second sealing ring.

2. The automotive electronic unit housing as described in claim 1, characterized in that: The elastic protrusions are symmetrically arranged on both sides of the second sealing ring, and the top of the elastic protrusions is press-fitted with the inner wall of the sealing groove to form a sealing connection.

3. The automotive electronic unit housing as described in claim 1, characterized in that: The bottom of the first sealing ring is provided with a protruding limiting part, and the bottom of the second sealing ring extends to the limiting part and is limited and connected thereto, so that the second sealing ring covers the outside of the first sealing ring.

4. The automotive electronic unit housing as described in claim 3, characterized in that: The bottom of the second sealing ring is tapered, and the middle part of the second sealing ring is a protruding arc that abuts against the inner wall of the sealing groove.

5. The automotive electronic unit housing as described in claim 1, characterized in that: A limiting gasket is provided between the first sealing ring and the second sealing ring, and the limiting gasket is used to limit the elastic deformation of the first sealing ring.

6. The automotive electronic unit housing as described in claim 1, characterized in that: The upper and lower housings are fixedly connected by bolts.

7. The automotive electronic unit housing as described in claim 6, characterized in that: A mounting cavity is formed between the upper housing and the lower housing, and the mounting cavity is used to install electronic components.

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