JP2003165340A - Glass run for automobile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a shift or a drop of a corner part between a door frame vertical frame part and a door frame upper frame part extending upward diagonally or of a part along the door frame upper frame part in a glass run formed of an olefin thermoplastic elastomer (TPO) and mounted to a door frame in an automobile. <P>SOLUTION: In the part 5A along the door frame upper frame part 5A of the glass run 5, coating layers 6a, 6b, 6c, and 6d of the olefin thermoplastic elastomer TPO softer than a glass run main body are formed in the parts touching a channel 3 in a base bottom part 50 having a U-shaped cross sectional shape and fitted in the channel 3 for increasing frictional resistance to the channel 3. On contact faces with door glass 4 in seal lips 53a and 53b extending from the front edges of side walls 52a and 52b in the bottom part 50, coating layers 7a and 7b harder than the glass run main body are formed for increasing slidability to the door glass 4. <P>COPYRIGHT: (C)2003,JPO

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a glass run mounted on a door frame of an automobile. 2. Description of the Related Art As shown in FIG. 2, a glass run 5 is attached to a door frame 2 of an automobile door 1 along the door frame 2 to guide the door glass 4 up and down. When closed, the outer periphery and the door frame 2
To seal between. As shown in FIG. 3, a glass run 5 is formed by opposing side walls 52a, 52a of a base 50 having a substantially U-shaped cross section.
b has a basic structure in which the seal lips 53a and 53b extend from the tip of b. On the other hand, a channel 3 having a substantially U-shaped cross section is provided on the inner peripheral side of the door frame 2,
As shown in FIG. 2, the channel 3 extends further downward from the door frame 2 and extends into the door body. As shown in FIGS. 1A and 2, the glass run 5 includes an upper portion 5A formed by extrusion along a door frame upper frame 2A along the roof side of the vehicle body and front and rear door frame vertical frames. The vertical portions 5B and 5C along the 2B and 2C are formed and connected by molding at corner portions 5D and 5E, and are attached by fitting the base portion 50 into the channel 3. The sealing lips 53a and 53b are Is sandwiched from both sides. The glass run 5 is generally made of ethylene propylene rubber (EPDM rubber). Recently, however, a glass run made of olefin-based thermoplastic elastomer (TPO) has been used instead. It has become. TPO products are advantageous in that they have sealing properties comparable to those made of EPDM rubber, do not require a vulcanizing step in the manufacturing process, and are lightweight. [0006] Incidentally, the door glass 4
Is repeated, in the glass run 5 made of TPO,
A corner portion, particularly a vertical portion 5B, and a corner portion 5D, which connects an upper side portion 5A extending obliquely upward from the upper end thereof, floats out of the channel 3 in a detaching direction, and undulates on the seal lips 53a, 53b of the upper side portion 5A. Shape deformation tends to occur. The inventor has noticed that the cause is as follows. That is, when the door glass 4 is lifted and closed, the upper edge portion 5A of the glass run 5 attached to the upper frame portion 2A of the door frame that is inclined with respect to the direction in which the door glass 4 is pushed up (X direction). When the door glass 4 is pressed from below, a shift force in the direction of pushing up along the channel 3 of the door frame upper frame portion 2A (Y direction) acts. However, since the frictional resistance of the glass run made of TPO with respect to the channel 3 is smaller than that of the glass run made of EPDM, a deviation occurs, and the corner portion 5D is pulled straight and floats, and the sealing lip of the upper side portion 5A is formed. Wavy deformation occurs in 53a and 53b. Therefore, the base 50 of the glass run 5 is usually made of a JIS type spring hardness Hs of 75 ° to 85 °.
Although it is considered that the hardness of the base portion 50 is made lower to increase the frictional resistance to the channel 3, it is not preferable to lower the hardness because the shape stability becomes insufficient. SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it is an object of the present invention to prevent a glass run made of TPO from causing a displacement when closing and closing a door glass, and to ensure excellent sealing performance. SUMMARY OF THE INVENTION The present invention is a glass run which is mounted in series on a channel having a substantially U-shaped cross section provided on the inner periphery of a door frame of an automobile door. In a glass run having a substantially U-shaped cross section and a seal lip extending from the end of the opposite side wall of the base and sandwiching the outer periphery of the door glass from both sides, the glass run is made of an olefin-based thermoplastic elastomer. (TPO), at least the upper side of the glass run, which is attached to the channel of the upper frame portion of the door frame along the roof side of the vehicle body, has a contact portion with the channel on the outer surface of the base portion of the glass run. In addition to forming a soft TPO coating layer, the contact surface of the seal lip with the door glass is harder than the glass run body. Form a coating layer of TPO. The displacement of the glass run when the door glass is closed is mainly determined by the frictional resistance of the glass run to the channel and the sliding resistance of the seal lip to the door glass. According to the present invention, a coating layer of TPO, which is softer than the glass run main body, is formed at a contact portion of the base of the glass run with the channel to increase the frictional resistance to the channel, and the glass run main body is provided on the contact surface of the seal lip with the door glass. By forming a harder coating layer to improve the slidability with respect to the door glass, the displacement of the glass run when the door glass is closed can be prevented. DETAILED DESCRIPTION OF THE INVENTION As shown in FIG. 1A, a glass run 5 is formed by vertical portions 5B, 5B before and after extruding TPO.
C and an upper side portion 5A, which is also formed by extruding TPO, is formed by TPO at front and rear corner portions 5D and 5E. The glass run 5 has substantially the same cross-sectional shape over its entire length, and as shown in FIG. 1B, a base 50 having a substantially U-shaped cross section and opposing side walls 5 of the base 50.
There are provided seal lips 53a, 53b extending from the tips of 2a, 52b to the inside of the base 50. A small lip 54 protrudes from an end of the bottom wall 51. A channel 3 having a substantially U-shaped cross section is formed on the inner peripheral side of the door frame 2. The glass run 5 is attached by fitting its base 50 into the channel 3, and the sealing lips 53a, 53b sandwich the outer periphery of the door glass 4 from both sides. In the drawings, reference numeral 20 denotes a retainer for holding an unillustrated door weather strip. The base 50 and the sealing lips 53a, 53b
Is made of a solid material of TPO having a hardness Hs of 75 ° to 85 ° like the glass run of the conventional TPO. Of the glass run 5, an upper side portion 5A attached to the door frame upper frame portion 2A has a coating layer 6a made of TPO softer than the glass run body on outer surfaces of both side walls 52a and 52b that come into contact with the channel 3 in an attached state.
6b are formed. When the door glass is closed, the bottom wall 5 is pushed up by the door glass 4 and comes into contact with the channel 3.
A similar soft coating layer 6c is also formed on the outer surface at the center in the width direction of No. 1. A soft coating layer 6d is also formed at the tip of the small lip 54. Coating layers 6a, 6b, 6c, 6d
Hardness is JIS type spring hardness Hs 30 ° -5
0 °. At the upper side 5A of the glass run 5, seal lips 53a, 53b contacting the door glass 4 are provided.
On the opposite surface of the TPO harder than the glass run body
Coating layers 7a and 7b are formed. Coating layers 7a, 7b
Has a Shore D type hardness of about 40 °. The hardness of TPO is adjusted by changing the blending ratio of the polypropylene resin, which is the main component of TPO, and EPDM rubber, and becomes soft by relatively increasing the rubber component. In addition, TPO can be softened by chemical foaming or water foaming. The soft coating layers 6a, 6b, 6c, 6d, 7a, 7b are extruded integrally with the glass run body. The portions of the glass run 5 which are in contact with the channels 3 on the upper side portion 5A are soft coating layers 6a, 6b, 6c, 6
In the glass run of TPO in which the hard coating layers 7a and 7b are formed at the places in contact with the door glass 4 while forming d, when the door glass 4 is raised and closed, the frame is inclined obliquely upward toward the rear. In the upper side portion 5A attached to the channel 3 of the upper frame portion 2A (FIG. 2),
When the door glass 4 is pushed in, a force to move the door glass 4 rearward acts. However, the slippage is prevented by the frictional resistance of the soft coating layers 6a, 6b, 6c and 6d which are in close contact with the channel 3, and the sliding properties of the hard coating layers 7a and 7b, and the glass run main body is formed in the corner. No lifting from the channel 3 occurs in the section 5D. And the soft coating layer 6
Since a, 6b, 6c, and 6d are in close contact with the channel 3, good sealing performance against water and outside noise is maintained.
Also, the hardness required for the shape retention of the glass run main body is secured. In the above embodiment, the soft coating layer is formed on almost all of the contact portion of the upper side portion 5A of the glass run 5 with the channel 3. However, even if only the coating layers 6a and 6b of the side walls 52a and 52b are used, The effect of preventing displacement is exhibited well. In the above embodiment, the soft coating layer is formed only on the upper side portion 5A. However, the soft coating layer may be formed also on the vertical portions 5B and 5C. In particular, the soft coating layers 6a and 6b may be formed on the outer surfaces of the side walls 52a and 52b. The formation of 6b is useful for preventing the glass run 5 from shifting as the door glass 4 moves up and down. It is desirable to form hard coating layers 7a, 7b on the seal lips 53a, 53b over the entire length of the glass run 5. In the above embodiment, the present invention is applied to the glass run of the front door. However, the same effect can be obtained by applying the present invention to the rear door. According to the present invention, in a glass run made of TPO which is mounted on a door frame of an automobile, the door glass for the upper side of the glass run mounted on the upper frame portion of the door frame when the door glass is closed. Of the glass run and the door frame can be satisfactorily maintained.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a glass run of the present invention, (A) is an overall view, and (B) is a state in which a door glass is closed at a position along the line IB-IB of (A). FIG. 4 is a sectional view of a mounted state of the glass run. FIG. 2 is a front view of an automobile door on which a glass run is mounted. FIG. 3 is a sectional view of a conventional glass run when the door glass is closed at a position along the line III-III in FIG. 2; [Description of Signs] 1 Door 2 Door frame 2A Door frame upper frame 2B, 2C Door frame vertical frame 3 Channel 4 Door glass 5 Glass run 50 Bases 53a, 53b Seal lip 54 Small lip 6a, 6b, 6c, 6d Soft coating layers 7a, 7b Hard coating layers

Continuation of front page    F term (reference) 3D201 AA01 AA13 CA19 DA03 DA21                       DA34 DA61 EA06D EA07B                       EA12

Claims (1)

Claims: 1. A glass run which is mounted in series on a substantially U-shaped channel provided on the inner periphery of a door frame of an automobile door, wherein the glass run is fitted into the channel. And a glass run having seal lips extending from both ends of the opposite side walls of the base and sealing the outer periphery of the door glass from both sides, wherein the glass run is made of an olefin-based thermoplastic elastomer (TPO). At least the upper side portion of the glass run, which is attached to the channel of the upper frame portion of the door frame along the roof side of the vehicle body, has a contact portion with the channel on the outer surface of the base portion covered with a TPO softer than the glass run body. In addition to forming a layer, a TPO coating layer harder than the glass run body is formed on the contact surface of the seal lip with the door glass. Automotive glass run, characterized in that it was.