KR20140060189A - Noise reduction tongue and method of manufacturing the same - Google Patents

Abstract

The present invention relates to a noise reduction type tongue of a vehicle seat belt and a manufacturing method thereof. The tongue for fixing webbing to a buckle comprises a tongue plate part which fixes the tongue by being coupled to the buckle; a first tongue mold part which is coupled to one side of the tongue plate part and through which the webbing passes through; and a second tongue mold part which reduces noise by being coupled to the outer side of the first tongue mold part and absorbing impact. The noise reduction type tongue has a soft material for the outer side of the tongue mold part compared to an existing tongue mold part using a single material. Therefore, the abrasion and noise can be reduced as the soft material absorbs the impact generated when a trim of a center pillar and the tongue collide.

Description

Noise reduction type tongue and method of manufacturing same

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tongue used in an automobile seat belt and a method of manufacturing the same. More particularly, the present invention relates to a tongue which is made of a single solid material, The present invention relates to a noise reduction type tongue for reducing noise generated when a vehicle collides with a trim of a vehicle, and a method of manufacturing the same.

BACKGROUND ART A seat belt installed on a seat of an automobile is a device for reducing an injury of a passenger seated on a seat during a vehicle collision, a collision, an overturning accident, or a sudden stoppage, and is generally provided with a webbing, a buckle, a tongue, And a retractor.

At this time, the webbing is made of synthetic fibers such as nylon or polyester and has a band shape, which serves to mitigate the impact of the occupant, and the tongue is a device for fixing the webbing to the buckle, And the retractor is mounted on a center pillar to automatically wind the webbing when the buckle and the tongue are separated from each other.

The center pillar refers to a central pillar on the side of a vehicle, including a front pillar positioned between the front glass and the side glass, a center pillar positioned between the side glass of the vehicle, Along with the rear pillar located at the rear of the car.

Background Art [0002] In recent years, as the number of cases where external noise of a vehicle is introduced into a vehicle is reduced due to the upgrading of a vehicle and technology, there is a tendency that a noise generated inside the vehicle is heard relatively relatively. Particularly, when the tongue is separated from the buckle, the tongue is returned to its original position with the trim of the center pillar by the retractor. However, when the tongue collides with the trim of the center pillar, noise is generated.

In addition, when the seat belt is operated while being released, the tongue continuously collides with the center pillar trim due to the inertia of the vehicle during vibration and rotation. The noise generated thereby may interfere with safe operation.

In addition to the noise problem, the continuous collision between the tongue and the center pillar causes mechanical wear of the component itself and thus cracks.

SUMMARY OF THE INVENTION It is an object of the present invention to overcome the above-mentioned problems by replacing the outer side of a conventional seat belt tongue mold part colliding with a trim of a center pillar with a soft material and absorbing a shock generated by collision between the tongue mold part and the center pillar trim. And to provide a noise reduction type tongue and a method of manufacturing the same that are needed to create a pleasant driving environment by reducing noise.

In order to achieve the above object, the present invention provides a tongue for fixing a webbing to a buckle, comprising: a tongue plate portion coupled with the buckle to fix the tongue; a first tongue mold coupled to one side of the tongue plate portion, And a second tongue mold part coupled to an outer side of the first tongue mold part and reducing noise by absorbing impact.

The material of the second tongue mold part may be any one selected from the group consisting of TPV (Thermoplastic vulcanizates), TPE (Thermoplastic elastomer), TPO (Thermoplastic olefinic elastomer) and TPU (Thermoplastic polyurethanes).

The apparatus may further include a separator disposed between the first and second tongue mold parts.

Further, it is preferable that the size of the spacing portion is 0.4 to 0.6 mm.

The material of the second toe mold part is characterized by comprising TPE of 3 to 6% by weight and the remainder of the TPU.

In addition, the engagement surfaces of the first and second tongue-shaped portions may be stepped.

Meanwhile, in a method of manufacturing a tongue for fixing a webbing to a buckle, a first injection step of coupling a first tongue mold part to one side of a tongue plate part which is engaged with the buckle and fixes the tongue, And a second injection step of coupling the second toe mold part.

At this time, the description of each of the configurations used above is as described above.

The effect of the present invention having the above-described structure is that by replacing the outer side of the conventional tongue mold part which collides with the trim of the center pillar with a soft material, the material absorbs the impact generated at the time of collision between the center pillar trim and the tongue , Noise can be reduced, and a pleasant driving environment can be provided.

Further, by replacing the outer side of the tongue mold part colliding with the trim with a material capable of absorbing shock, it is possible to suppress cracks and wear due to the continuous impact of the tongue and the center pillar trim.

In addition, since the outer side of the tongue-shaped portion is used as a soft material, the tongue is improved in tactile feel by gripping by hand, thereby improving the tongue's merchantability.

1 is a photograph showing a contact portion of a general tongue.
2 is a photograph of a tongue of a conventional seat belt.
3 is a photograph of a noise reduction type tongue according to an embodiment of the present invention.
4 is a schematic view of a coupling structure of a tongue according to the present invention as an embodiment;
5A is a photograph of a TPV used as a material of the second tongue mold part according to an embodiment of the present invention.
FIG. 5B is a photograph of a TPV used as a material of a second tongue mold part according to an embodiment of the present invention. FIG.
5c is a photograph of a TPV used as a material of the second tongue mold part according to an embodiment of the present invention.
FIG. 5D is a photograph of a TPV used as a material of the second tongue mold part according to an embodiment of the present invention. FIG.
6 is an enlarged photograph of a joint surface of a first tongue mold part and a second tongue mold part according to an embodiment of the present invention.
7 is a photograph showing a noise reduction type tongue after completing a heat resistance test according to an embodiment of the present invention.
8 is a photograph showing a separation part of a noise reduction type tongue according to an embodiment of the present invention.
9 is a cross-sectional view of a tongue in which the engagement surfaces are stepped, according to one embodiment of the present invention.

The terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms and the inventor may appropriately define the concept of the term in order to best describe its invention It should be construed as meaning and concept consistent with the technical idea of the present invention. Therefore, the embodiments described in this specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention. Therefore, It should be understood that variations can be made.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

As described above, generally, the seat belt is for fixing a passenger to a seat, and is mounted on an automobile seat so that an occupant seated on the seat during a collision or impact of the automobile moves forward to prevent a second collision . Such a seat belt is classified into a two-point type or a six-point type according to the number of points to be supported, and a three-point type seat belt is most commonly used for a general passenger car.

In recent years, vehicle noise has increased in consumer choice of vehicles. Especially in the automobile interior, when the tongue is separated from the buckle or when the vehicle is operated with the seat belt released, Noise caused by collision and mechanical wear caused by the collision are a problem.

Accordingly, the present invention provides a noise reduction type tongue that absorbs impact generated when a tongue and a center pillar collide with each other, and reduces noise and wear by replacing the outer side of the conventional tongue mold part with a soft material.

FIG. 1 is a photograph showing a contact portion of a general tongue. The contact portion 500 is a portion where the tongue comes into contact with the hand at the time of tongue grasping and the tongue collides with the center pillar. To thereby improve shock absorption as well as reduction of noise and wear, as well as improvement in touch.

FIG. 2 is a tongue photograph of a conventional seat belt. As shown in FIG. 2, the tongue is composed of a tongue plate part 100 and a tongue mold part 200. At this time, the tongue plate part 100 serves to fix the tongue to the buckle, and the webbing penetrates through the tongue mold part 200 and connects the tongue to the webbing. The tongue plate part 100 is made of a steel material and the tongue mold part 200 is made of a single material of polyamide 66. The contact part 500 of the tongue part, Is made of polyamide which is a hard material, there is a problem that when the tongue collides with the trim of the center pillar, noise and wear are generated.

Accordingly, the present invention provides a noise reduction type tongue for solving the above problems. 3 is a photograph showing a noise reduction type tongue according to an embodiment of the present invention. As shown in the photograph, a conventional single-piece tongue mold part 200 coupled to one side of the tongue plate part 100, Into a first tongue mold part 210 and a second tongue mold part 220 for use of different materials.

Specifically, the first tongue mold part 210 is coupled to one side of the tongue plate part 100, and serves to attach the tongue to the webbing as the webbing passes therethrough.

The second tongue mold part 220 is a contact part 500 coupled to the outside of the first tongue mold part 210 and contacting the tongue with the trim of the center pillar or contacting with the hand when gripping. It absorbs noise and reduces mechanical wear.

The tongue of the present invention having the above-described structure is characterized in that the first tongue mold part 210 maintains the performance and durability of the conventional tongue, and the functionality of reducing noise by the second tongue mold part 220 It has its characteristics in things.

Therefore, the material of the second tongue mold part 220 is also important. It is necessary to use a material having superior shock absorbing ability as compared with the material of the conventional tongue mold part 200, and it is preferable to use TPV (thermoplastic vulcanizates) It is preferable to use TPE (Thermoplastic elastomer), TPO (Thermoplastic olefinic elastomer), TPU (Thermoplastic polyurethanes) or the like.

FIG. 4 is a schematic view illustrating a coupling structure of a tongue according to an embodiment of the present invention. As shown in the drawing, the tongue is manufactured by injection molding, which is a general thermoplastic polymer manufacturing method. Conventionally, a tongue is attached to one side of a tongue plate part 100 which is coupled with a buckle using a polyamide (PA66) The first tongue mold part 210 through which the webbing is passed on one side of the tongue plate part 100 is formed by using the polyamide (PA66) according to the present invention as a first injection molding Molding the second toe mold part 220 on the outer side of the first toe mold part 210 using materials having excellent shock absorbing ability.

The concrete manufacturing process includes a step 1 for storing the raw material, a step 2 for storing the raw material in the injection waiting place, a step 3 for drying the resin stored in the injection waiting place, a step for setting the mold for manufacturing the double- , The first injection step with the mold, the fifth injection step with the mold, and the sixth injection step with the second injection step based on the first injection item, and the detailed injection conditions at the first injection step and the second injection step are as follows: Are shown in Tables 1 and 2.

division Condition division Condition division Condition Injection primary speed 36% Injection primary pressure 36bar Nozzle 255 ℃ Injection secondary speed 52% Injection secondary pressure 52 bar Cylinder 1 248 ° C Injection tertiary speed 38% Injection third pressure 38 bar Cylinder 2 246 ° C Repressive 38 bar Injection time 7sec Cylinder 3 245 ° C Weighing speed 45% Cooling time 15 sec - -

Table 1 is a table showing an embodiment of the primary injection condition for the production of the first toe mold part 210.

division Condition division Condition division Condition Injection primary speed 18% Injection primary pressure 42.8 bar Nozzle 180 DEG C Injection secondary speed 18% Injection secondary pressure 42.8 bar Cylinder 1 178 ° C Injection tertiary speed 45% Injection third pressure 42.8 bar Cylinder 2 172 ℃ Repressive 60bar Injection time 10sec Cylinder 3 170 ℃ Weighing speed 62% Cooling time 8 sec - -

Table 2 above is a table showing examples of secondary injection conditions for the production 220 of the second tongue mold part.

5A to 5D are photographs showing tongues manufactured by injection molding TPV, TPE, TPO and TPU, respectively, of the second tongue mold part 220 according to an embodiment of the present invention, and FIG. 6 is a photograph The first tongue mold part 210 and the second tongue mold part 220 are enlarged. As shown in the figure, when the different materials are used, .

Therefore, it is necessary to optimize the injection conditions in order to minimize stickiness caused by the use of different materials and to improve the adhesion, which will be described in detail in Table 3 below.

division PA66 TPV TPE TPO TPU Nozzle temperature 290 ° C 290 ° C 220 ℃ 220 ℃ 220 ℃ Hot water temperature - 50 ℃ 50 ℃ 50 ℃ 50 ℃ Mold temperature - 48 ° C 48 ° C 48 ° C 48 ° C Adhesiveness - Great Great Inadequate Great Hardness - lowness height height height Degree of pollution at impact usually Bad usually Good The second tongue mold part
Forced exit test - Partly
Abandoned Partly
Abandoned Whole
Abandoned Partly
Abandoned

Table 3 is a table comparing the detailed conditions and test results of the injection molding according to the present invention, which is a method of manufacturing the tongue according to the present invention, according to the material of the second tongue mold part. Hot water temperature and mold temperature values represent optimal injection conditions obtained through multiple tests (50 times) to minimize stickiness and improve adhesion.

In the tongue produced by the optimum injection conditions, the second tongue mold departure test was performed to test the adhesion of the second tongue mold part. As a result, when the material of the second tongue mold part 220 is TPO, the entirety of the second tongue mold part 220 is separated from the first tongue mold part 210, TPV, TPE and TPU were different from the TPO. As a result, TPV, TPE and TPU were higher than TPO in terms of adhesiveness to polyamide material. I was able to confirm that it was somewhat superior.

In other words, although there are slight differences in terms of physical properties such as adhesiveness and hardness for each of the materials, all of the above materials pass the heat resistance test according to ES88800-08, indicating that there is no problem in using the tongue according to the present invention. As a method, it was left in the air for 24 hours at a temperature of 70 to 90 ° C and a relative humidity of 90 to 100 ° C, followed by drying at a temperature of 70 to 90 ° C for 24 hours. FIG. 7 shows a heat resistance test This is a photograph showing a noise reduction type tongue that finished.

However, the noise-reduced tongue tested in the above table has no gap between the first and second tongue mold parts 210 and 220, so that burrs are generated during manufacture, There is a disadvantage that an additional process for removing the bur is required.

Therefore, it is preferable to join the second tongue mold part 220 while forming a gap on the outer side of the first tongue mold part 210 in order to reduce the occurrence of the burr and improve the aesthetic appearance.

FIG. 8 is a photograph showing a spacing part of the noise reduction type tongue according to an embodiment of the present invention. As shown in FIG. 8, the spacing part 400 between the first toe mold part 210 and the second toe mold part 220 The above effect is achieved.

At this time, it is preferable that the size of the spacing part 400 is 0.4 to 0.6 mm. If the spacing part 400 is less than 0.4 mm, the effect of forming the spacing part 400 mentioned above is insignificant. If it exceeds 0.6 mm, And the second toe mold part 220 are greatly reduced, resulting in a problem that the durability of the tongue mold part is lowered.

However, since the tongue with the spacing added reduces the adhesive force between the first tongue mold portion and the second tongue mold portion as compared with the additional tongue, it is necessary to reinforce the durability of the tongue by optimizing the material and injection conditions of the second tongue mold portion Which will be described in detail in Table 4 below.

division PA66 TPU (100%) TPU + TPE (less than 3%) TPU + TPE (3-6%) TPU + TPE (greater than 6%) Nozzle temperature 290 ° C 220 ℃ 220 ℃ 220 ℃ 220 ℃ Hot water temperature - 50 ℃ 50 ℃ 50 ℃ 50 ℃ Mold temperature - 48 ° C 48 ° C 48 ° C 48 ° C Adhesiveness - Bad Bad Great Great Hardness - height height height lowness Degree of pollution at impact - Good Good Good Bad The second tongue mold part
Forced exit test - Whole
Abandoned Whole
Abandoned Partly
Abandoned Partly
Abandoned

Table 4 is a table comparing the secondary injection conditions and the test results of the second toe mold part 220 for reinforcing the durability of the tongue formed with the spacing parts according to composition. As shown in the table, To test the adhesion of the second tongue mold part, a second tongue mold part deviation test was performed.

As a result, when the material of the second toe mold part 220 is a TPU, the entirety of the second toe mold part 220 is separated from the first toe mold part 210, . Therefore, when the TPE is less than 3% by weight based on the total weight of the second toe mold part 220 and the remainder is TPU, the second toe mold When the TPE is more than 6% by weight and the remainder is TPE, a part of the second tongue mold part 220 is released, so that the adhesive property is excellent. However, Most preferably, the composition of the second tongue mold part 220 has a TPE of 3 to 6% by weight and the remainder is TPU in consideration of adhesiveness and durability against impact.

In order to improve the bonding property between the first and second tongue mold parts and the second toe mold part, not only the above-mentioned composition change but also the area and bonding properties of the bonding surfaces of the first and second tongue mold parts are generally proportional Can be used.

FIG. 9 is a cross-sectional view of a tongue in which the coupling surface is a stepped shape according to an embodiment of the present invention. As shown in FIG. 9, when the coupling surfaces of the first and second tongue- The area can be easily increased to compensate for the deterioration of the coupling due to the use of different materials.

As described above, according to the present invention, the conventional single-material tungsten mold part is made of a different material from the first tungsten mold part and the second tungsten mold part, the noise is reduced by changing the composition and the bonding relationship of the second tung- Provides durable noise-reducing tongue.

Although the present invention has been described in connection with the specific embodiments of the present invention, it is to be understood that the present invention is not limited thereto. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents. Various modifications and variations are possible.

100: Tongue plate portion
200: Tung mold part
210: first tongue mold part
220: second tongue mold part
300: coupling surface
400:
500:

Claims (12)

In a tongue for fixing a webbing to a buckle,
A tongue plate portion (100) coupled with the buckle to secure the tongue;
A first tongue mold part 210 coupled to one side of the tongue plate part 100 and passing through the webbing; And
A second tongue mold part 220 coupled to the outside of the first tongue mold part 210 to reduce noise by absorbing impact;
And a noise reduction type tongue.
The method according to claim 1,
The material of the second toe mold part 220 is any one selected from the group consisting of TPV (Thermoplastic vulcanizates), TPE (Thermoplastic elastomer), TPO (Thermoplastic olefinic elastomer) and TPU (Thermoplastic polyurethanes) Noise Reduction Type Tong.
The method according to claim 1,
Further comprising a spacing portion (400) located between the first and second tongue mold portions (210, 220).
The method of claim 3,
And the size of the spacing part (400) is 0.4 to 0.6 mm.
The method of claim 3,
Wherein the material of the second toe mold part (220) is comprised of TPE of 3 to 6% by weight and the remainder of the TPU.
The method according to claim 1,
Wherein the mating surfaces (300) of the first and second tongue mold parts (210, 220) are stepped.
A method of manufacturing a tongue for securing a webbing to a buckle,
A first injection step of coupling the first tongue mold part 210 to one side of the tongue plate part 100 coupled with the buckle to fix the tongue;
A second injection step of coupling the second tongue mold part 220 to the outside of the first tongue mold part 210;
Wherein the noise reduction type tongue is formed of a synthetic resin.
8. The method of claim 7,
Wherein the material of the second toe mold part 220 in the secondary injection step is any one selected from the group consisting of TPV, TPE, TPO, and TPU.
8. The method of claim 7,
Wherein the second injection step comprises forming the spacing part (400) on the outer side of the first tongue mold part (210) and engaging the second tongue mold part (220).
10. The method of claim 9,
Wherein the size of the spacing part (400) is 0.4 to 0.6 mm.
10. The method of claim 9,
Wherein the material of the second tongue mold part (220) is composed of 3 to 6% by weight of TPE and the remainder of the TPU.
8. The method of claim 7,
Wherein the second injection step couples the second tongue mold part 220 such that the mating surfaces 300 of the first and second tongue mold parts 210 and 220 are stepped A method for manufacturing a noise reduction type tongue.

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