KR102426920B1 - Manufacturing method of vehicle wheel resonator - Google Patents

Abstract

The present invention relates to a method for manufacturing a wheel resonator for a vehicle. Injection molding is obtained through first molding and cooling of a front cover and a back cover; bonding and fixing of the front cover and the back cover in continuous work without separating the front cover and the back cover which are individually molded in a condition of moving a variable mold from a fixing mold and re-combining the same; and a second molding process of edge finishing sealing using molding resin. Thickness uniformity and edge sealing of the wheel resonator are not affected to wheel balance when applied to the wheel for a vehicle, and implement stable sound absorption having durability. Therefore, the present invention improves quality and reliability for the wheel resonator.

Description

Manufacturing method of a vehicle wheel resonator {Manufacturing method of vehicle wheel resonator}

The present invention relates to a method of manufacturing a wheel resonator for a vehicle, and more particularly, the manufacturing of the wheel resonator is divided into a front cover and a rear cover by an injection molding method using a fixed mold and a variable mold, and the position of the variable mold from the fixed mold It relates to a method of manufacturing a wheel resonator for a vehicle that can produce a high-quality wheel resonator by converting the front cover and the rear cover together with the sealing finish of the edges at the same time.

In recent years, various methods have been mobilized to suppress noise generated during driving of a vehicle, and a wheel resonator is used among noise reduction devices of a vehicle for reducing noise of such a measure.

The wheel resonator is a component to dramatically reduce the resonance noise generated during driving of the vehicle. It is more advantageous because it provides a little better control in straightness and cornering, but the noise and vibration coming from the floor increases that much.

Therefore, wheel resonators are being applied in this respect. The wheel resonator is a sound absorbing body that applies the Helmholtz resonator principle. When the pressure drop inside the tire occurs, the air in the resonance hole acts as a mass, and the air in the resonance chamber acts as a spring to cause resonance. .

In general, high-inch wheel-applied vehicles with wheel resonators reduce noise and resonant noise so that you can enjoy quiet driving while driving.

Usually, 19-inch wheels of vehicles equipped with wheel resonators have the advantage of lowering noise by 3 to 4 decibels (db) compared to high-inch wheels without wheel resonators, so they are usually selected and used as a high-spec vehicle option.

The wheel resonator is made of a hollow tube body in an arc shape. Usually, 4 pieces are attached to the rim part of the wheel in contact with the inner side of the tire in a set and are combined with a strap to match the curve of the rim. By reducing the noise transmitted to the wheel from the tire in contact with the ground as much as possible, a resonance chamber for resonance is formed inside, a connection part is formed on both sides, and a resonance hole is formed from the resonance chamber on one side by four resonance chambers. It is designed to absorb vibration noise by entering and entering the air through the resonance hole, respectively, to have a sound-absorbing effect.

Although there is a slight difference in the shape of the wheel resonator, if you look at the source technology of the wheel resonator, Korean Patent Publication No. 10-2019-0007259 (Name: Ultrasonic Fusion Wheel Resonator, Publication Date: January 22, 2019, hereinafter referred to as ' Patent Document 1 '), Patent Publication No. 10-2019-0085333 (Name: Tire noise reduction device, Publication date: July 18, 2019, hereinafter referred to as 'Patent Document 2') and Registered Patent No. No. 10-1893350 (name: resonator wheel, registration date: August 24, 2018, hereinafter referred to as 'patent document 3') is disclosed.

The wheel resonators disclosed in Patent Documents 1 to 3 are generally manufactured by blow molding.

While blow molding has the advantage that it can be easily manufactured through a series of work processes, since the inner wall thickness of the resonance chamber constituting the body of the wheel resonator is difficult to be manufactured uniformly due to the characteristics of blow molding, it is difficult to use it by attaching it to the rim of the wheel. It is also becoming a factor affecting wheel balance.

In general, as described above, the function of the wheel resonator is to minimize the transmission of noise that is reflected between the tire and the rim and causes a resonance phenomenon as a sound having a certain peak toward the interior of the vehicle. If the thickness is not uniform, the noise reduction effect and durability are lowered.

For example, it is possible to consider the manufacture of the wheel resonator by injection molding by dividing the body of the wheel resonator, but the secondary manufacturing process of fitting the injection-molded ones and rejoining the edges of them is made. This production method Silver workability is not only significantly lowered, but also has a disadvantage in that the reliability of the product is significantly lowered due to the defect of the joint area as described above in the inspection process of good products and in the state applied to the actual wheel.

The present invention was invented to solve the problems of the related art as described above, and the wheel resonator is manufactured by dividing the front cover and the rear cover by an injection molding method using a fixed mold and a variable mold, and is manufactured from a fixed mold to a variable mold. The purpose of the present invention is to provide a method of manufacturing a wheel resonator for a vehicle that allows the production of high-quality wheel resonators by changing the position of the front cover and the rear cover and sealing the edges at the same time.

According to the present invention for achieving the above object, a resonance chamber is provided inside in an arc shape, a resonance hole communicating with the resonance chamber is provided on one side, and a strap groove for strap binding is recessed in the center of the outside. Method of manufacturing a wheel resonator for a vehicle In

In accordance with the shape of the front cover and the rear cover that divides the wheel resonator into front and back, close the fixed mold with multiple molding parts arranged up and down and the variable mold with multiple molding parts (A2, B1) arranged up and down to close the molded resin injection 160~ Forming the front cover and the rear cover under the temperature condition of 200 ℃, respectively, and cooling to 80 ~ 90 ℃; Separating the variable mold from the fixed mold to open the front cover to the forming part of the fixed mold and the rear cover to the forming part of the variable mold while maintaining a fixed state; sliding the variable mold upward to a position where the rear cover on the variable mold side coincides with the front cover molded on the fixed mold side of the variable mold with respect to the fixed mold by the forward operation of the hydraulic cylinder provided at the lower part of the variable mold; Fitting projections are formed on the rear surface of the front cover at equal intervals, and coupling grooves are formed on the front surface of the rear cover so that the fitting projections are forcibly inserted. bonding and fixing the rear cover to the rear of the front cover; On the edge side of the rear cover, a guide jaw guiding the edge of the front cover and a stepped portion into which the molding resin injected through a resin gate provided in the molding part of the fixed mold are formed are formed between the edge of the front cover in contact with the stepped portion and finishing molding the edges of the front cover and the rear cover by injecting high-temperature molding resin through the resin gate into the peripheral portions of the front cover and the rear cover; and taking out the wheel resonator in which the front cover and the rear cover are integrally bonded and molded by separating the variable mold from the fixed mold.

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In the method of manufacturing a wheel resonator for a vehicle according to the present invention, the injection molding is a front cover and a rear cover each molded under the conditions of primary molding and cooling of the front cover and the rear cover, and the movement of the variable mold from the fixed mold and reintegration. Since it is obtained through the secondary molding process of bonding and fixing the front cover and the rear cover with continuous work without separation, and edge finishing sealing using molding resin, the uniform thickness of the wheel resonator and the edge sealing are the wheel balance when applied to vehicle wheels. It is possible to improve the quality and reliability of the wheel resonator in that it can implement a more durable and stable sound absorbing body without affecting the performance.

1 is a perspective view showing a wheel resonator according to the present invention;
2 is a block process diagram illustrating step by step the manufacturing process of the wheel resonator according to the present invention;
3 is a front view showing a wheel resonator according to the present invention;
Figure 4 is a cross-sectional view of Fig. 3 explaining the body forming process of the wheel resonator according to the present invention;
5 is a side cross-sectional view schematically showing the operating state of the fixed mold and the variable mold according to the molding of the front cover and the rear cover of the wheel resonator according to the present invention;
6 is a front view showing the arrangement of the forming part of the fixed mold and the variable mold according to the manufacture of the wheel resonator according to the present invention.

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

Prior to this, the terms or words used in the present specification and claims should not be construed as being limited to conventional or dictionary meanings, and the inventor should properly understand the concept of the term in order to best describe his invention. Based on the principle that it can be defined, it should be interpreted as meaning and concept consistent with the technical idea of the present invention.

Accordingly, the embodiments described in this specification and the configurations shown in the drawings are only the most preferred embodiment of the present invention, and do not represent all of the technical spirit of the present invention, so at the time of the present application, they can be replaced It should be understood that various equivalents and modifications may exist.

A method of manufacturing the wheel resonator 10 for a vehicle of the present invention will be described with reference to the accompanying FIGS. 1 to 6 .

A resonance chamber (10a) is provided inside in an arc shape, a resonance hole (10b) communicating with the resonance chamber is provided on one side, and a strap groove (10c) for strap binding is recessed in the center of the outside. Manufacturing of a wheel resonator (10) is primarily molded through an injection mold to match the shape of the front cover 10-1 and the rear cover 10-2 divided by the wheel resonator 10 into front and rear, and after such molding, the front cover and the rear surface in the mold It is designed to be molded and manufactured by joining and combining the front cover and the rear cover by moving the mold without taking out the cover.

The mold for injection molding the wheel resonator is divided into a fixed mold 2 and a variable mold 4, which divide the wheel resonator 10 into front and rear covers 10-1 and rear cover 10-2. The molding parts are arranged and formed according to the shape. In addition, although not shown in the drawing, a resin inlet through which the molding resin is supplied, an air outlet for blowing out and holding the molded product, etc. are provided on the molding part side, and these are combined in a horizontal direction or spaced apart from each other, and injection molding is performed.

As shown in the accompanying FIG. 6 , the forming portion is provided with forming portions A1 and A2 and forming portions B1 and B2, and the forming portion A2 and B1 is formed in the fixed mold 2 , and a variable mold is provided. In (4), the molding parts A1 and B2 are arranged vertically.

That is, the molding part (A2) allows the outer surface of the front cover (10-1) to be molded, and the molding part (A1) is to mold the inner surface of the front cover (10-2), and the molding part (B1) is arranged to mold the inner surface of the rear cover 10-2, and the molding part B2 forms the outer surface.

The variable mold (4) is provided with a hydraulic cylinder (1) at its lower portion and is installed to be movable up and down, and the variable mold (4) is provided to slide from the guide rail (4-2) of the fixed block (4-1). do.

The molding of the wheel resonator 10 through the fixed mold 2 and the variable mold 4 configured as described above is shown in FIGS. 2, 4 and 5 attached thereto.

By injection of molding resin in a state in which the fixed mold 2 in which a plurality of molding parts A1 and B2 are arranged vertically and the variable mold 4 in which a plurality of molding parts A2 and B1 are arranged vertically are united 160 The front cover (10-1) and the rear cover (10-2) are respectively molded under the temperature condition of ~200 ℃.

In order to maintain the shape of the molded product in the state of being molded, it undergoes a process of cooling to 80~90℃.

By separating the variable mold 4 from the stationary mold 2, the front cover 10-1 is provided on the molding part A2 of the stationary mold 2, and the rear cover 10-1 is provided on the molding part B2 of the variable mold 4 10-2) is maintained in a fixed state, and the fixed and variable molds are opened.

As described above, the maintenance of the fixed state of the front cover and the rear cover is maintained in a state in which the front cover is not taken out of the fixed mold as described above through the air inlet for fixing or taking out the molding under the air suction condition in a conventional injection mold, On the variable mold side, the rear cover is maintained in a state in which it is not taken out.

In the above state, the operating rod of the hydraulic cylinder 1 provided at the lower part of the variable mold 4 is advanced, and the variable mold is moved upward by the forward operation.

Here, upward sliding of the variable mold is performed by applying the variable mold 4 with respect to the fixed mold 2 to the front cover 10-1 formed on the fixed mold 2 side and the rear cover 10 of the variable mold 4 side. -2) stops at the same position.

When the variable mold 4 is horizontally moved from the stationary mold 2 in the state as described above and merged, the rear cover 10-2 is aligned with the rear surface of the front cover 10-1, and the bonding is fixed.

In the step (S40) of bonding and fixing the rear cover 10-2 to the rear surface of the front cover 10-1, fitting projections 10d are formed at equal intervals on the rear surface of the front cover 10-1, A coupling groove 10e is formed on the front surface of the rear cover 10-2 so that the fitting protrusion is forcibly inserted, thereby bonding and fixing the front cover 10-1 and the rear cover 10-2.

That is, in the mutual coupling of the fitting protrusion 10d and the coupling groove 10e, the central portion of the strap groove 10c of the front cover 10-1 coincides with the central side of the rear cover 10-1. , a stable assembly of the wheel resonator 10 having a resonance chamber 10a is made by forcibly bonding in a state of maintaining a predetermined temperature, and an embossed portion formed inwardly recessed in the front cover and the rear cover. The edge side of the rear cover 10-2 is seated on the guide jaw 10f formed on the edge of the front cover 10-1 together with the mutual adhesion of the front cover 10-1, and also the stepped portion 10g of the rear cover 10-2. maintains a gap (t) with the edge side of the front cover (10-1).

In the state as described above, a high-temperature molding resin is injected through the resin gate 4a provided in the molding part A2 of the stationary mold 2, and the edges of the front cover 10-1 and the rear cover 10-2 finish molding

On the edge side of the rear cover 10-2, a guide jaw 10f for guiding the edge of the front cover 10-1 and a stepped portion 10g through which the molding resin injected through the resin gate 4a flows are formed. Finish molding is integrally formed between the edges of the front cover 10-1 and the peripheral portions of the front cover 10-1 and the rear cover 10-2 in contact with the stepped portion 10g.

Finally, by separating the variable mold 4 from the fixed mold 2, the front cover 10-1 and the rear cover 10-2 are integrally formed by taking out the wheel resonator 10, which is a molded product required. to get

In this way, the wheel resonator manufactured by injection molding is fixedly installed as a strap on the rim of the vehicle wheel, which is not shown in a circle, as shown in FIG. 1 to absorb noise derived from the ground during vehicle driving. used

As described above, the present invention has been described with specific matters such as specific components and limited embodiments and drawings, but these are only provided to help a more general understanding of the present invention, and the present invention is not limited to the above embodiments. , various modifications and variations are possible from these descriptions by those of ordinary skill in the art to which the present invention pertains.

Therefore, the spirit of the present invention should not be limited to the described embodiments, and not only the claims to be described later, but also all those with equivalent or equivalent modifications to the claims will be said to belong to the scope of the spirit of the present invention. .

1: Hydraulic cylinder 2: Fixed mold
4: Variable mold 4-1: Fixed block
4-2: guide rail 10: wheel resonator
10-1: Front cover 10-2: Rear cover
10a: resonance chamber 10b: resonance hall
10c: Strap groove 10d: Fitting projection
10e: coupling groove 10f: guide jaw
10g: step part A1, A2, B1, B2: molded part

Claims (3)

A resonance chamber (10a) is provided inside in an arc shape, a resonance hole (10b) communicating with the resonance chamber is provided on one side, and a strap groove (10c) for strap binding is recessed in the center of the outside. Manufacturing of a wheel resonator (10) In the method,
A fixed mold (2) and a molding part ( A2, B1) close the variable mold 4 arranged in a plurality of top and bottom to mold the front cover 10-1 and the rear cover 10-2 respectively under the temperature condition of 160 ~ 200 ℃ by injection of the molding resin, , cooling to 80 ~ 90 ℃ (S10) and;
By separating the variable mold 4 from the stationary mold 2, the front cover 10-1 is provided on the molding part A2 of the stationary mold 2, and the rear cover 10-1 is provided on the molding part B2 of the variable mold 4 (B2). 10-2) maintaining each fixed state and opening (S20);
With the forward operation of the hydraulic cylinder (1) provided at the lower part of the variable mold (4), the variable mold (4) with respect to the fixed mold (2) is variable on the front cover (10-1) molded on the side of the fixed mold (2) The step (S30) of sliding the variable mold (4) upward to a position where the rear cover (10-2) of the mold (4) side coincides with each other;
Fitting projections 10d are formed at equal intervals on the rear surface of the front cover 10-1, and coupling grooves 10e are formed on the front surface of the rear cover 10-2 so that the fitting projections 10d are forcibly inserted. to close the variable mold 4 from the fixed mold 2 so that the front cover 10-1 and the rear cover 10-2 are bonded and fixed to the rear of the front cover 10-1, the rear cover 10- 2) the step of bonding and fixing (S40);
On the edge side of the rear cover 10-2, the guide jaw 10f for guiding the edge of the front cover 10-1 and the resin gate 4a provided in the molding part A2 of the fixed mold 2 are injected through Between the edges of the front cover 10-1 in contact with the stepped portion 10g and between the front cover 10-1 and the rear cover 10-2 by molding to form a stepped portion 10g into which the molded resin to be introduced is formed. A step (S50) of finishing the edges of the front cover (10-1) and the rear cover (10-2) by injecting a high-temperature molding resin through the resin gate (4a) at the periphery (S50);
Taking out the wheel resonator 10 in which the front cover 10-1 and the rear cover 10-2 are integrally formed by separating the variable mold 4 from the fixed mold 2 (S60); A method of manufacturing a wheel resonator for a vehicle, characterized in that made. delete delete

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