JPH0510052U - Automotive weather strip - Google Patents

Abstract

(57) [Abstract] [Purpose] In a weather strip for automobiles such as a door glass run in which a molding portion is connected to an end of an extruded body having a sealing lip, the sealing lip of the sealing material is injected by a molding pressure of a molding material. The deformation of the end portion in the longitudinal direction is prevented, its appearance is improved, and the flexibility of the seal lip in the lateral direction is improved. [Structure] The seal lip 5 of the extruded body 2 is molded from EPDM solid rubber. A plurality of pores 8 having a circular cross-section extending in the longitudinal direction are provided through the inside of the seal lip 5, and the end faces thereof are opened at the interface with the molding portion. Excess molding material in the mold molding portion flows into the pores 8 and the injection pressure acting on the seal lip 5 is relieved. Since the seal lip 5 has a porous structure that is highly flexible in the lateral direction due to the pores 8, the seal lip 5 can be molded from solid rubber.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a weather strip for an automobile, which is attached to an opening / closing portion such as a door portion, and more specifically to a weather strip for an automobile in which a molding portion is connected to an end portion of an extruded body having a seal lip. is there.

[0002]

[Prior Art]

 As this type of weather strip, for example, a door glass run as shown in FIG. 4 is known. This door glass run is usually constructed by connecting two adjacent extruded bodies 2 at a corner portion of the door 1 by a molding portion 3. The conventional extruded body 2 is extruded in a cross-sectional shape as shown in FIG. 6, for example, and is made of EPDM (ethylene / propylene / diene copolymer) sponge rubber having a high flexibility in a portion in contact with the wind glass 4. A seal lip 5 and a seal wall 6 are provided, and the other parts are molded of EPDM solid rubber. On the other hand, the molding unit 3 is molded with EPDM solid rubber in a cross-sectional shape corresponding to the extruded body 2. At the time of molding, as shown in FIG. The end of each extruded body 2 is set, and an unvulcanized solid rubber material is injected into the cavity.

[0003]

[Problems to be solved by the device]

 However, according to the conventional door glass run, when the solid rubber material for molding the mold molding portion 3 is injected into the cavity, the injection pressure presses the connection interface of the pusher body 2 as shown by the arrow in FIG. Therefore, there is a problem that the end portions of the sponge rubber seal lip 5 and the seal wall 6 in the extruded body 2 are deformed and wrinkles are generated on the surfaces thereof. In particular, in the case of the seal lip 5, the surface thereof is exposed to the passenger compartment side, so that there is a disadvantage that the design is impaired if wrinkles occur here. Although attempts have been made to form an escape portion for the injection material in the mold of the molding apparatus 7 (for example, Japanese Examined Patent Publication No. 3-16253), the applicable product shape is In addition to being limited, there is a problem that the shape of the cavity becomes complicated and the manufacturing cost of the mold is high.

Therefore, an object of the present invention is to prevent the seal lip of the extruded body from being deformed in the longitudinal direction due to the injection pressure of the molding material, to improve its appearance, and to flex the seal lip in the lateral direction. It is to provide a weather strip having good properties.

[0005]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention provides a weather strip for an automobile in which a molding portion is connected to an end portion of an extruded body having a seal lip, and intersects with an interface between the sealing lip and the molding portion. A pore or a narrow groove is provided in the longitudinal direction, and the pore or the narrow groove is opened at the interface.

Here, as the above-mentioned “automobile weather strip”, various weather strips to be mounted on an opening / closing portion of an automobile such as a door opening of a body, an engine hood portion, a trunk lid portion, in addition to a door glass run. Can be illustrated. Examples of the "mold forming section" include one that connects the abutting ends of two adjacent extruded bodies at a bent portion such as a corner, or one that is formed by being connected to the end of the extruded body. ..

[0007]

[Action]

 According to the weather strip of the present invention, the pores or narrow grooves of the seal lip are formed in the direction intersecting with the interface with the molding portion, and the openings are formed at the interface. The surplus molding material of the mold molding portion flows into the inside, and the injection pressure acting on the seal lip is relaxed. The pores or narrow grooves are formed in the longitudinal direction of the seal lip, and in order to make the seal lip highly flexible in the lateral direction, the seal lip is made of a relatively hard material. Can be molded. Therefore, the end of the seal lip is less likely to be deformed in the longitudinal direction, and wrinkles on the surface are effectively prevented.

[0008]

【Example】

 A first embodiment in which the present invention is embodied in a vehicle door glass run will be described below with reference to the drawings. As shown in FIGS. 4 and 5, the door glass run of this embodiment is formed by connecting two adjacent extruded bodies 2 at a corner portion of the door 1 by a molding portion 3 as shown in FIGS. ..

The extruded body 2 is extruded with a cross-sectional shape as shown in FIG. 1, and unlike the conventional case, only the seal wall 6 is extruded from EPDM sponge rubber, and the other part including the seal lip 5 is formed. Is molded from EPDM solid rubber. A plurality of pores 8 having a circular cross section are provided in the inner portion of the seal lip 5 so as to extend in the longitudinal direction, and the end faces of the pores 8 are open at the interface with the molding portion 3. The pores 8 are formed with different diameters so that the thickness of each part of the seal lip 5 is substantially uniform. When molding the extruded body 2, the pores 8 can be formed by embedding a linear body such as a wire in the seal lip 5 and coextruding it, and then pulling out the linear body.

According to the door glass run of this embodiment configured as described above, the pores 8 of the seal lip 5 are formed in the direction intersecting with the interface with the molding part 3, and the opening is formed at the interface. Therefore, the surplus molding material of the molding part 3 flows into the pores 8 and the injection pressure acting on the seal lip 5 is relieved. Therefore, the end portion of the seal lip 5 is less likely to be deformed in the longitudinal direction, and wrinkles on the surface can be prevented to improve the appearance. Further, since a plurality of the pores 8 are formed in the longitudinal direction of the seal lip 5, the seal lip 5 has a porous structure with high flexibility in the lateral direction, and the seal lip 5 is provided in other parts. It can be molded from the same hard EPDM solid rubber as. Therefore, longitudinal deformation and wrinkles of the end portion of the seal lip 5 can be more effectively prevented. Furthermore, since the pores 8 are formed in the extruded body 2, unlike the conventional case, it is not necessary to modify the mold of the molding apparatus 7, which is advantageous in terms of manufacturing cost. The seal lip 5 may be molded of hard EPDM sponge rubber instead of EPDM solid rubber.

Next, in a second embodiment shown in FIG. 2, the seal lip 5 is made of a hard EPDM sponge rubber, and inside the seal lip 5, a plurality of pores each having a cross-section long hole shape are formed. 8 is formed in the longitudinal direction crossing the interface with the mold forming portion 3, and is open at the interface. This structure also has an effect that wrinkles on the surface of the seal lip 5 can be effectively prevented and the pores 8 are relatively large, so that they can be easily formed, as in the above-described embodiment. The pores 8 having an elongated cross section may be formed in the seal lip 5 made of EPDM solid rubber.

Next, in the third embodiment shown in FIG. 3, a plurality of fine grooves 9 are formed in the back surface of the seal lip 5 in the longitudinal direction so as to intersect with the interface with the molding portion 3, and It is open in the field. Also by this, the surplus molding material of the molding part 3 flows into the inside of the narrow groove 9, so that the injection pressure acting on the seal lip 5 can be relaxed. Of course, also in this case, the seal lip 5 may be molded from EPDM solid rubber.

It should be noted that the present invention is not limited to the above-mentioned embodiment, and for example, the shape of the pores or narrow grooves or the molding material of the seal lip can be changed appropriately, or the molding portion can be connected to the end of the extruded body. The purpose of the invention is to apply it to a weatherstrip that is installed on the vehicle, or to apply to a weatherstrip attached to each opening and closing part of an automobile such as a door opening of a body, an engine hood part, a trunk lid part, etc. It is also possible to embody by arbitrarily changing the shape or configuration of each part without departing from the scope.

[0014]

[Effect of the device]

 As described above in detail, according to the present invention, pores or narrow grooves are provided in the longitudinal direction intersecting the interface of the seal lip of the extruded body with the mold forming portion, and the pores or narrow grooves are formed at the interface. Since it is opened, it is possible to prevent the seal lip from deforming in the longitudinal direction due to the injection pressure of the molding material, improve its appearance, and improve the flexibility of the seal lip in the lateral direction. Play.

[Brief description of drawings]

FIG. 1 is a cross-sectional perspective view of an extruded body of a door glass run according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a seal lip according to a second embodiment of the present invention.

FIG. 3 is a sectional view of a seal lip according to a third embodiment of the present invention.

FIG. 4 is a front view of a door showing a mounting portion of a door glass run.

5 is an enlarged front view of the main part of FIG. 4. FIG.

FIG. 6 is a cross-sectional view of an extruded body according to a conventional door glass run.

[Explanation of symbols]

 2 Extruded body 3 Molded part 5 Seal lip 8 Pore 9 Fine groove

Claims (1)

[Claims for utility model registration] [Claim 1] A weather strip for an automobile, in which a molding portion is connected to an end portion of an extruded body having a seal lip,
A weather strip for an automobile, characterized in that pores or narrow grooves are provided in a longitudinal direction intersecting an interface with the molding portion of the seal lip, and the pores or narrow grooves are opened at the interface.