KR-102960300-B1 - Ventilation cap

KR102960300B1KR 102960300 B1KR102960300 B1KR 102960300B1KR-102960300-B1

Abstract

A ventilation cap is provided. A ventilation cap according to one embodiment of the present invention is a ventilation cap coupled to the outer surface of a housing protrusion having an inner surface that forms an opening communicating with the outside and inside of the housing, formed on the outer surface of a housing of an automobile part by a first length from the outer surface of the housing, and comprising: a body including an inner surface coupled to the outer surface of the housing protrusion and a plurality of vent holes located radially outward with respect to the inner surface; and a cover formed in a tubular shape having a closed end, having an inner surface in contact with the outer surface of the body and a step at the closed end that restricts the insertion of the body so that when the body is inserted, the vent holes communicate with the opening. The vent holes penetrate one surface of the body located at one end of the body along the direction of protrusion of the housing protrusion and the other surface of the body located at the other end of the body along the direction of protrusion of the housing protrusion.

Inventors

한영식
우병찬
엄광현

Assignees

(주)상아프론테크

Dates

Publication Date: 20260507
Application Date: 20250724

Claims (12)

A ventilation cap coupled to the outer surface of a housing protrusion having an inner surface that forms an opening communicating the outside and inside of the housing, formed on the outer surface of the housing of an automobile part in a shape protruding by a first length from the outer surface of the housing. A body comprising an inner surface coupled to the outer surface of the housing protrusion and a plurality of vent holes located radially outward with respect to the inner surface; and A cover formed in a tubular shape having a closed end, comprising an inner surface that contacts the outer surface of the body, and a step on the closed end that restricts the insertion of the body so that when the body is inserted, the vent hole communicates with the opening. The above vent hole is, Penetrating one surface of the body located at one end of the body along the protrusion direction of the housing protrusion, and the other surface of the body located at the other end of the body along the protrusion direction of the housing protrusion, The above body is formed such that the distance between the above one surface and the above other surface is a second length shorter than the first length, and A ventilation cap in which the end end opposite to the direction of protrusion of the housing protrusion of the above cover, the other surface of the body, and one end of the vent hole are located on the same plane.
delete
In Article 1, A ventilation cap having a membrane filter installed at one end of the above body.
In Paragraph 3, A ventilation cap, wherein the end of the housing protrusion along the direction of the protrusion of the housing protrusion contacts one surface of the membrane filter.
In Paragraph 3, The above body has a filter groove formed by being recessed from the one side to the other side, the shape corresponding to the membrane filter, The above membrane filter is a ventilation cap installed in the filter groove.
In Article 1, A ventilation cap, wherein the body is formed of an elastic material, and the outer surface has an uneven portion formed that protrudes radially outward from the body.
In Article 6, A ventilation cap, wherein the above-mentioned protrusions are formed at two or more locations on the outer surface of the body along the protrusion direction of the housing protrusions.
In Article 6, The above-mentioned uneven portion is formed continuously along the circumference of the outer surface, forming a ventilation cap.
In Article 1, The above cover is a ventilation cap formed in a shape extending from the step by the second length along the direction opposite to the protrusion direction of the housing protrusion.
delete
In Article 1, The outer surface of the body and the inner surface of the cover are formed as circular shapes with corresponding cross-sections cut in a direction perpendicular to the protrusion direction of the housing protrusion at a position equidistant from the outer surface of the housing. A ventilation cap, wherein the outer surface of the above cover is formed to include two or more sides, the cross-sections cut in a direction perpendicular to the protrusion direction of the housing protrusion are formed at a predetermined angle relative to each other.
In Article 1, A ventilation cap in which the inner surface of the body is coupled to the outer surface of the housing protrusion so as not to be exposed on the ventilation path.

Description

Ventilation cap The present invention relates to a ventilation cap, and more specifically, to a ventilation cap that is coupled to a housing of an automobile part to form a compact ventilation structure. Automotive ventilation caps are installed on automotive electronic components, lamps, sensors, etc., and perform the function of stably regulating pressure changes inside the housing due to changes in the external environment, while effectively preventing the ingress of contaminants such as external moisture and dust. Electrical components used in automobiles are exposed to extremely harsh environments, such as rapid temperature changes due to starting and stopping, continuous vibrations while driving, and moisture penetration during rain and car washes. These environmental changes cause the air inside the component housing to expand or contract, inducing pressure changes, which can stress the seal portion of the housing, thereby reducing durability or causing malfunction of sensitive internal components. Therefore, the role of the ventilation cap in rapidly maintaining pressure equilibrium inside and outside the housing is crucial for ensuring the reliability of the vehicle. In particular, recent automotive technology, coupled with the advancement of autonomous driving, infotainment systems, and the transition to electric vehicles, is leading to an exponential increase in the number of components installed in vehicles, such as electronic control units (ECUs), various sensors, battery packs, and lamps. Consequently, the design requirement to integrate numerous components at a high density within the limited space of a vehicle is becoming increasingly significant. This technological trend applies without exception even to small parts such as ventilation caps, and the need for compact structures that minimize overall size and, in particular, the height protruding outward (Z-axis) is increasing day by day. It is important for the ventilation cap to possess high durability and reliability, enabling stable long-term operation in any environment, while maintaining a high level of water and dust resistance as a foundation and having a simple structure for high productivity. For this purpose, various types of ventilation caps have been proposed in the past. Korean Patent No. 10-1701469 (hereinafter referred to as 'Prior Art 1') discloses a ventilation cap that is coupled to the outer surface of a protrusion provided in an automobile part housing. The above prior art document 1 is characterized by a body formed as a 'two-stage structure' consisting of an upper part and a lower part having different diameters, and a shape in which the body extends long downwards from the lower part of the upper part where a ventilation hole is formed. Due to these structural features, a space of a certain volume, namely the 'first gap (dead space),' is formed between the lower surface of the filter and the end of the housing protrusion. This 'first gap' is included in the total internal volume of the ventilation cap and can act as a factor affecting the path and time until pressure changes inside the housing are relieved through the filter. In addition, in environments where temperature changes occur, the space had the potential to become a condensation point for water vapor. Meanwhile, Japanese Patent No. 4555217 (hereinafter referred to as 'Prior Art 2') discloses a ventilation cap that is coupled to the outer surface of a protrusion of a housing, similar to Prior Art 1. However, prior art 2 formed the body into a 'multilayer composite structure' by combining two or more materials with different properties (e.g., a rigid resin part and an elastic resin part) for rigid sealing and fixation. This structure required precise mold technology and expensive multi-injection molding equipment, causing a significant increase in manufacturing costs. In addition, the structure of prior art 2 can cause a 'delamination' phenomenon in which the bonding surface between dissimilar materials with different coefficients of thermal expansion accumulates fatigue under repeated thermal shock of the automobile. This is a critical failure mode that causes a complete loss of the ventilation cap's sealing performance, which can pose a fundamental threat to the product's long-term reliability. In addition, prior art 2 also has an empty space between the filter and the housing protrusion, similar to the 'first gap' of prior art 1, and has the same problem of reducing air circulation reactivity by acting as a de facto 'dead space'. Accordingly, there is an urgent need to develop a new ventilation cap that is structurally simple and highly reliable, while minimizing unnecessary internal space to overcome the structural characteristics of Prior Art 1 and the existence of the first gap resulting therefrom, as well as the complex multi-material structure of Prior Art 2 and the resulting issues of reduced reliability and high cost, and to maximize reactivity, which