JP3778077B2 - Automotive glass run - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a glass run mounted on a door frame of an automobile.
[0002]
[Prior art]
As shown in FIG. 3, a glass run 5 is attached to the door frame 2 of the door 1 of the automobile to guide the raising and lowering of the door glass 4, and when the door glass 4 is closed, its outer periphery The space between the door and the door frame 2 is sealed.
[0003]
As shown in FIG. 4, the glass run 5 has a basic structure in which seal lips 53a and 53b extend from the tips of opposite side walls 52a and 52b of the base 50 having a substantially U-shaped cross section. 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, and the channel 3 extends further downward from the door frame 2 and extends into the door body as shown in FIG.
[0004]
As shown in FIGS. 1A and 3, the glass run 5 includes an upper side portion 5 </ b> A of extrusion molding along the door frame upper frame portion 2 </ b> A that extends obliquely upward and rearward along the roof side of the vehicle body, and the front and rear doors. The vertical side portions 5B and 5C along the frame vertical frame portions 2B and 2C are formed and connected by molding at the corner portions 5D and 5E, and are attached by fitting the base portion 50 into the channel 3 as shown in FIG. The seal lips 53a and 53b sandwich the outer periphery of the door glass 4 from both sides.
[0005]
Glass run 5 is generally made of ethylene / propylene rubber (EPDM rubber), but recently, olefin thermoplastic elastomer (TPO) has been used instead. . The product made of TPO is advantageous in that it has a sealing performance comparable to that made of EPDM rubber and does not require a vulcanization step in the production process and is lightweight.
[0006]
[Problems to be solved by the invention]
By the way, when the raising and lowering of the door glass 4 is repeated, in the glass run 5 made of TPO, the corner portion, in particular, the front vertical side portion 5B on the front side and the upper side portion 5A extending obliquely upward from the upper end thereof are connected. The corner portion 5D to be lifted is shifted from the channel 3 in the removal direction, and the wavy deformation tends to occur in the seal lips 53a and 53b of the upper side portion 5B.
[0007]
The inventors have noted that the cause is as follows. That is, the upper side of the glass run 5 attached to the door frame upper frame portion 2A that is inclined with respect to the pushing-up direction (X direction) of the door glass 4 when the door glass 4 is raised to the rising end and closed. A displacement force in the direction of pushing up along the channel 3 of the door frame upper frame portion 2A (Y direction) by the pressing of the door glass 4 from below acts on the portion 5A. However, the frictional resistance against the channel 3 of the glass run made of TPO is smaller than that of the glass run made of EPDM rubber, so that a deviation occurs, the corner portion 5D is pulled linearly and floats, and the seal of the upper side portion 5A is generated. Ripple deformation occurs in the lips 53a and 53b.
[0008]
Therefore, it is conceivable that the hardness of the glass run 5 made of TPO is made lower than the commonly used Hs 75 to 85 to increase the frictional resistance against the channel 3. 50 is deformed and is difficult to assemble, and shape stability is insufficient after assembly, which is not preferable.
[0009]
In view of such circumstances, the present invention has been made with the object of providing a glass run that makes use of the advantages of TPO and that does not shift or deform at the corner and the door frame upper frame.
[0010]
[Means for Solving the Problems]
The invention of claim 1 is a glass run that is fitted to a channel provided on the inner peripheral side of a door frame of an automobile and is attached to the door frame, the vertical sides being attached to the front and rear door frame vertical frame portions, respectively. In the glass run formed by connecting the upper side portions attached to the upper frame portion of the door frame that connects between the upper ends of the front and rear door frame vertical frame portions and extends obliquely rearward and upward at the corner portions, the both vertical side portions described above Is formed of an extruded product of an olefinic thermoplastic elastomer, the upper side portion is formed of an extruded product of ethylene / propylene rubber, and each extruded product is molded and connected with an olefinic thermoplastic elastomer at a corner.
[0011]
By forming the vertical sides before and after the glass run with TPO which does not require vulcanization, the productivity of the glass run is improved. The upper side portion of the glass run is formed of EPDM rubber having a higher frictional resistance to the channel than TPO, thereby preventing the upper side portion from being displaced or deformed.
DETAILED DESCRIPTION OF THE INVENTION
As shown in FIG. 1A, the glass run 5 is formed by forming and connecting the front and rear vertical side portions 5B and 5C and the upper side portion 5A at the front and rear corner portions 5D and 5E. The glass run 5 has substantially the same cross-sectional shape over the entire length, as shown in FIGS. Seal lips 53a and 53b extending in the base 50 are provided.
[0015]
The vertical side portions 5B and 5C are TPO extrusion moldings, and the upper side portion is an EPDM rubber extrusion molding, and the corner portions 5D and 5E are located between the vertical side portions 5B and 5C and the ends of the upper side portion 5A. It is formed by molding and connecting with TPO.
[0016]
In the vertical side portions 5B and 5C made of TPO, the opposing surfaces of the seal lips 53a and 53b sandwiching the outer peripheral portion of the door glass 4 are higher than the hardness (generally Hs 75 to 85) of the main body of the vertical side portions 5B and 5C. A coating layer (not shown) of hardness TPO is formed, and the sliding resistance against the door glass 4 is lowered. The coating layer of TPO is extruded integrally with the main body of the vertical side portions 5B and 5C.
[0017]
In the upper side portion 5A made of EPDM rubber, a urethane coating layer (not shown) is formed on the opposing surfaces of the seal lips 53a and 53b and the inner surface of the bottom wall 51 against which the upper edge of the door glass 4 is pressed when the door glass is closed. The sliding resistance with respect to the door glass 4 is made low. The urethane coating layer is formed by means such as spraying urethane on the extruded upper side portion 5A.
[0018]
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 the base portion 50 into the channel 3, and the seal lips 53a and 53b sandwich the outer peripheral portion of the door glass 4 from both surfaces. In the figure, 20 is a retainer for holding a door weather strip (not shown).
[0019]
In the glass run 5 configured as described above, the vertical side portions 5B and 5C do not need to be vulcanized at the time of extrusion molding, and a high hardness TPO coating layer as a glass sliding material can be formed by integral extrusion. Good sex.
[0020]
On the other hand, in the upper side portion 5A, when the door glass 4 reaches the ascending end and is closed, a force to move backward along the channel 3 acts. However, the upper side portion 5A has a friction against the channel 3 rather than TPO. Since it is formed of EPDM rubber having a high resistance, there is no deviation that causes the corner portion 5D to float up from the channel 3 or causes the wavy deformation of the seal lips 53a and 53b.
[0021]
The corner portions 5D and 5E of TPO are advantageous in that they do not need to be vulcanized at the time of mold molding connection, and are less likely to generate burrs during mold molding than rubber.
[0022]
FIG. 2 shows a reference example of a glass run in which the occurrence of displacement and deformation is prevented. The upper side portion 5A of the glass run 5 is composed of a composite of EPDM rubber and TPO. That is, the base portion 50 of the upper side portion 5A is made of EPDM rubber, the seal lips 53a and 53b having a TPO coating layer having high hardness on the opposing surfaces are made of TPO, and the upper side portion 5A is integrally extruded. After the extrusion molding, a urethane coating layer is formed on the inner surface of the bottom wall 51 of the base portion 50.
[0023]
On the other hand, the vertical side portions 5B and 5C of the glass run 5 are entirely formed of TPO as in the previous embodiment, and the molded corner portions 5C and 5D are also formed of TPO as in the previous embodiment.
[0024]
In this reference example , in the upper side portion 5A, since the base portion 50 fitted to the channel 3 is formed of EPDM rubber, the occurrence of displacement and deformation is prevented as in the previous embodiment. Further, since the seal lips 53a and 53b are formed of the same TPO as that of the molding connecting material, the bonding force with the molding corners 5D and 5E is enhanced as compared with the case where the entire upper side portion 5A is formed of EPDM rubber. The
[0025]
【The invention's effect】
Since the vertical side portion of the glass run is made of TPO and the upper side portion is made of EPDM rubber, the productivity of the glass run is improved as compared with the case where the glass run is made of EPDM rubber over the entire length. In addition, the glass run is made of TPO over the entire length, and the glass run is less displaced from the channel, especially at the corner and upper side of the glass run, ensuring good sealing performance between the channel and the door glass. can do.
[0026]
Although the said embodiment demonstrated the front door of the motor vehicle, the glass run of this invention may be applied also to a rear door.
[Brief description of the drawings]
1A and 1B show an embodiment of the present invention, in which FIG. 1A is an overall view of a glass run, FIG. 1B is a sectional view of a glass run attached at a position along the line IB-IB in FIG. (C) is an attached state sectional view of the glass run at a position along the IC-IC line of (A).
FIG. 2 shows a reference example of a glass run, and is a cross-sectional view of a glass run attached at a position along the line IB-IB in FIG.
FIG. 3 is a front view of an automobile door equipped with a glass run.
4 is a cross-sectional view of a conventional glass run in an attached state at a position along line IV-IV in FIG.
[Explanation of symbols]
2 Door frame 2A Door frame upper frame part 2B, 2C Door frame vertical frame part 3 Channel 4 Door glass 5 Glass run 5A Upper side part 5B, 5C Vertical side part 5D, 5E Corner part 50 Base part 53a, 53b Seal lip

Claims (1)

A glass run that is fitted to a channel provided on the inner peripheral side of a door frame of an automobile and is attached to the door frame, a vertical side portion that is attached to each of the front and rear door frame vertical frame portions, and the front and rear door frame vertical frames In a glass run formed by connecting the upper side portion attached to the upper frame portion of the door frame extending diagonally upward and connecting the upper ends of the portions at the corner, the both vertical side portions are made of an olefin-based thermoplastic elastomer. An automotive glass run comprising an extruded body, wherein the upper side portion is composed of an extruded body of ethylene / propylene rubber, and each extruded body is molded and connected with an olefinic thermoplastic elastomer at a corner.

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