JPS58170649A - Weather strip for automobile - Google Patents

Abstract

PURPOSE:To prevent deformation or the like in a connection part of weather strips whose end parts are connected to each other by the method of injection molding, by forming a rib in a bridged state to a reverse side of the connection end part of a seal lip in each weather strip. CONSTITUTION:A weather strip 1 consists of a welt part 3 embedding a core metal 2, holding lip 4 provided to the internal face of said part 3, soft seal lip 5 formed by sponge rubber or the like to the external side, and a water drain lip 6, and is formed to a long size by the method of continuous extrusion vulcanization molding. When the strip 1 as formed in such way is connected, a binding agent of unvulcanized rubber or hot melt system resin or the like is filled in an injection molding connection part 9. Here in a part not influencing to a seal characteristic of a seal reverse side 5d of the lip 5, a rib 12 is formed in a bridged state to a connection end part of each lip 5 to prevent deformation or the like of the connection part.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automotive featherstrip in which the ends of an extruded weatherstrip having a sealing lip are joined together by injection molding.

A weather strip having a sealing lip as shown in FIG. 1 is used. In other words, 1.1 is a weather strip for the side window of an automobile, which has a substantially U-shaped cross section that fits into the 7 flange of the opening of the vehicle body, and has a base 9 elbow portion 8 and a core metal 2 embedded therein. , a retaining snug 4 provided on the inner surface of the cough welt i8, and a flexible sealing rib 15 formed of sponge rubber or the like on the outer surface. It is molded into a long length using the continuous extrusion vulcanization molding method. In the process of processing such a long weather piece to be attached to a specific side window, when joining the ends of each other, it is necessary to Using a mold 8 having a cavity 7 having the same cross-sectional space as the cross-sectional shape of the weather strip 1, the weather strip that is continuous with the KW inside the cavity 7 is placed oppositely with a metal film interposed between its end surfaces. And this gap trap is made of unvulcanized rubber.

Alternatively, a bonding agent such as hot melt resin such as ethylene vinyl acetate (1, V, M) is injected to form an injection molded joint, and the end surfaces of both weatherstrips are bonded to the core injection molded III joint. They are joined by interposing them in between. In addition, 8m, 8b.

8C and 8(l are the respective split molds of the mold 8, which are joined together by bottles, knocks, etc., and form a cavity 71 having the shape described above.

However, in the first conventional example, which is molded using the above mold, (1) the seal lip 16 is molded from flexible sponge rubber, and (2) the cavity 7 in which the seal lip 5 is accommodated is (3) The bonding agent should be injected into a larger area than the volume of the injection molded joint, and the excess bonding agent should be released as a liquid before molding. For some reason, when the bonding agent is injected into the cavity 7, a large pressure is applied to the bonding shoulder surface before the bonding agent escapes as particles, causing the seal litz 5t.
The injection molded joint 9 is molded in the state 11, and as a result, as shown in FIG. There is a drawback that deformation, shrinkage, etc. occur when molding is performed in a state that has not yet been deformed.

A second conventional example devised to solve this drawback is a weather strip molded using a round mold, as shown in FIG. In this mold 8.

The seal lift receiving portion 71Lt of the cavity 7 has a narrower gap than the normal thickness of the seal lip 5 shown by the chain line. According to this mold, the flexible seal lip 5Fi
Since it is supported under pressure by the accommodation portion 7 & of the cavity 7, deformation due to the bonding agent injection pressure as in the previous case does not occur.

However, in the conventional example of @2, the end N3 of the seal lip b etc. is formed into the injection molded connection part 9 in a widely compressed state due to the pinching pressure of the housing part 7, so that it does not meet the lake surface in the compressed state. The connection s9 is formed only on the 9th part, and in the restored state released from the mold as shown in FIG.

111b, 10a, and lOd', and there is a problem that the step S deteriorates the sealing performance of the lip and may cause water leakage.

The present invention simultaneously solves the problems shown in FIG. 8 of the first conventional example and the problems shown in FIG. 6 of the second conventional example. , by forming a bridging-like lip at the seal lip pleat joint end 85 of both weatherstrips to be joined, in a portion that does not affect the sealing properties. This is aimed at solving the problems of the second conventional example.

The structure of the present invention will be explained below according to an embodiment shown in the drawings from FIG. 6 onwards.

The embodiment shown in FIG. 6 is made by joining the southern parts of the weather strip 1.1 having the structure shown in FIG. a welt s8, a retaining lip 4 provided on the inner surface of the welt portion 8, and a flexible sealing lip 15 made of sponge rubber or the like on the outer surface. It is molded into a long length using the continuous extrusion molding method.

Reference numeral 9 denotes an injection molded joint, which is molded by injecting a bonding agent such as P1 unvulcanized rubber and a hot melt resin containing -Fi and ethylene vinyl acetate (E, V, A).

12Fi lip, seal back side 6d of seal lip 15
Five weather strips 71.10 and 5.5 weather strips are formed across the joints of the seal lips 5.5 and 71.5 in portions that do not affect the sealing properties of the seals. In other words, Seallip 75Fi,,
The seal surface bc is placed in close contact with the gold glass surface, and the base end is subjected to a draining force, and sealing is performed by the reaction force. It is provided at the tip of the skin and does not affect the bending.

In this embodiment with the above configuration, when joining, as shown in FIG. 7, the space shape is the same as the cross section of the feather striso 71 shown in FIG. A mold 8t having grooves 11 and a companion cavity 7 is used. Same as the conventional example, 1w! The weather strips 1 to be joined are placed opposite each other leaving a gap corresponding to the injection molded joint 9 to be formed between the joint end faces, and each is divided! ! 18m, 8b, 8c, 8d
(i) Cavity surface (t) Place the surface in contact with the shell portion of the weather strip 1 and fix it.

Since the cavity 7 is the same space as the cross section of the seal lip 5, if the injection pressure inside the cavity 7 exceeds a predetermined value, It is conceivable that deformation as shown in FIG. 8 will occur. However, cavity 7
Since the groove groove 11 is provided, the bending agent flows into the groove 11 after forming the injection molding joint ff1s9, and the lip 12 is formed.

In this embodiment with the above configuration, since the lip 12 is provided in a spanning manner on the seal back surface 6d of the seal lip 15, the joint end of the seal lip 15.6 and the injection molded joint s9 are homogeneous. By reinforcing the molded joint 9, it is possible to obtain the same sealing reaction force and sealing performance as other seal lips 16. Also, Rip 12 has a negative effect on the cool characteristics lol
ft. Since it is provided at the end binding portion with the back side 5 of the seal, the bending load will not increase, the sealing characteristics will not be adversely affected, and the appearance will not be damaged. Furthermore, in the bonding and forming process, even if the injection amount of the bonding agent is not constant, the excessive injection pressure will be absorbed by the concave concave part 11 of the cavity 7, so the excessive injection l1tT/C Deformation of the seal lip 15 is prevented.

As explained above, in the present invention, a lip joint is formed in a extending shape at the joint end of both seal lips on the back side of the seal lip in a portion that does not affect the sealing characteristics, so that the appearance is improved. It is possible to obtain the same sealing reaction force and sealing performance as other seal rinpros at the joint end of the seal lip 5.5 and the injection molded joint υ without any problems. It is possible to prevent deformation, "shrinkage" and the occurrence of steps in the seal ring 1 due to the amount of heat, and it is possible to improve the sealing performance at the joint by making the seal surface of the seal lip planar.

[Brief explanation of drawings]

FIG. 1(A) is a sectional view of a weather strip having injection molded joints according to the first conventional example, FIG. 1(B) is a flat curved view thereof, and FIG. 2 is a mold used in the first conventional example. Cross-sectional view, Figure 3 is a plan view of the joint of the conventional example of @i, Figure @4 is a cross-sectional view of the mold used in the second conventional example, and Figure 5 is the seal lip joint of the second conventional example. 6(a) is a sectional view of one embodiment of the present invention, (b) is a plan view of the same, and FIG. 7 is a sectional view of a mold used in the embodiment shown in FIG. 6. be. 1... Weather strip, 6... Seal lip,
5m, 5b...Joining end, 5c...Seal surface, 5
(1...back side of seal, υ...2E large contact area, 1
2... Reply. Figure 5

Claims (1)

[Claims] (1) The ends of the extrusion-molded weather strip 7 having a seal lip [in the weather strip 7 which is joined by injection molding, the seal back surface of the seal lip that affects the V-ru% property qII A feather strip for an automobile, in which a bridge-like rib is formed at the joint end of the two-car seal rim 7 in a portion that does not affect the area.