Weather Strip For Motor Vehicle
Weather strip exhibiting excellent sealing properties
, of which a tubular seal portion is prevented from readily tilting when attached to a curved flange in a vehicle body. The weather strip includes a trim portion having a generally U-shaped cross-section and a tubular seal portion.
The tubular seal portion includes a first outer seal wall, a second outer seal wall, a first inner seal wall, a second inner seal wall, an outer flexing part and an inner flexing part. The thickness of the tubular seal portion decreases in the order of joint areas of the first outer seal wall and the first inner seal wall to the trim portion, the second outer seal wall and the second inner seal wall, and the outer flexing part and the inner flexing part.
A weather strip for a motor vehicle, which is to be attached to a flange around an opening in a vehicle body for sealing an opening surface of the vehicle body against afacing member, comprising: a trim portion including an outer side wall, an inner side wall and a bottom wall for attachment to the flange and holding the weather strip.
And a tubular seal portion integrally formed with said trim portion for contactingthe facing member and effecting a seal between the opening surface and the facing member, wherein said tubular seal portion comprises: an outer seal wall which extends from an outer end of the bottom wall of said trim portion and comprises a first outerseal wall and a second outer seal wall; and an inner seal wall which extends from an inner end of the bottom wall of said trim portion and comprises a first inner seal wall and a second inner seal wall, wherein a distal end of said second outer sealwall and a distal end of said second inner seal wall being joined to each other, and said outer wall is formed in an L-shaped configuration and said inner wall is formed in an L-shaped configuration, said tubular seal portion having a substantiallylozenge-shaped cross-section, wherein a joint of said first outer seal wall and said second outer seal wall defines an outer flexing part, wherein a joint of said first inner seal wall and said second inner seal wall defines an inner flexing part,wherein said outer seal wall has a thickness which is the greatest in a joint area of said first outer seal wall to said trim portion, and gradually decreases in the order of said second outer seal wall and said outer flexing part.
Inner sealwall has a thickness which is the greatest in a joint area of said first inner seal wall to said trim portion, and gradually decreases in the order of said second inner seal wall and said inner flexing part, wherein a thickness of the first outer sealwall is substantially the same as a thickness of the first inner seal wall, and a thickness of each of the first outer seal wall and the first inner seal wall is greatest in a part adjacent to the bottom wall that comprises a root thereof, and athickness of a remaining part of each or the first outer seal wall and the first inner seal wall is approximately constant or gradually decreases toward each of the flexing parts, such that a thickness of the tubular seal portion in the outer flexingpart and the inner flexing part is less than a thickness of a remaining portion of the tubular seal portion, wherein said weather strip comprises one of a trunk weather strip and a back door weather strip, and wherein said weather strip is composed ofone of an ethylene propylene diene M-class rubber (EPDM rubber) and a thermoplastic olefin elastomer.
Accordingly, it is an object of the present invention to provide a weather strip of which a tubular seal portion is difficult to tilt when attached to curved areas of a flange of a vehicle body, and exhibits excellent sealing properties.
In accordance with a first aspect of the present invention, a weather strip for a motor vehicle, which is to be attached to a flange around an opening in a vehicle body for sealing an opening surface of the vehicle body against a facing member,includes a trim portion for attachment to the flange and holding the weather strip, and a tubular seal portion integrally formed with the trim portion for contacting the facing member and effecting a seal between the opening surface and the facingmember. The tubular seal portion includes an outer seal wall which extends from an outer end of an upper part of the trim portion and is composed of a first outer seal wall and a second outer seal wall, and an inner seal wall which extends from an innerend of the upper part of the trim portion and is composed of a first inner seal wall and a second inner seal wall, an end of the second outer seal wall and an end of the second inner seal wall are jointed to each other, a joint of the first outer sealwall and the second outer seal wall defines an outer flexing part, a joint of the first inner seal wall and the second inner seal wall defines an inner flexing part, and the outer seal wall has a thickness which is the greatest in a joint area of thefirst outer seal wall to the trim portion, and gradually decreases in the order of the second outer seal wall and the outer flexing part, whereas the inner seal wall has a thickness which is the greatest in a joint area of the first inner seal wall tothe trim portion, and gradually decreases in the order of the second inner seal wall and the inner flexing part.
With this arrangement, the Weatherstripping includes a trim portion to be attached to the flange, and a tubular seal portion integrally formed with the trim portion for contacting the facing member and effecting a seal between the opening surfaceand the facing member so that when the trim portion is attached to the flange, the weather strip can be held and secured to the vehicle body. And the trim portion attached to the flange retains the posture of the weather strip without tiltingdownwardly, and consequently, the tubular seal portion securely contacts the facing member to provide a seal between the opening surface and the facing member.
by: Angela
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