KR101594733B1 - Car wheel by forming a cavity in the inner rim - Google Patents

Abstract

The present invention relates to an automobile wheel with a cavity formed in an inner rim and, more specifically, to an automobile wheel with a cavity formed in an inner rim, which reduces the weight of the automobile wheel by forming a cavity in an inner rim, that is, an inner side of the border between a rim part and a spoke part of the automobile wheel consisting of a rim part and a spoke part and forming an undercut in the entrance, and reduces vibration and noise occurring while driving by inserting a rubber damper into the cavity.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a car wheel having a cavity formed in an inner rim portion,

The present invention relates to an automobile wheel in which a hollow portion is formed in an inner rim portion, and more particularly, to a rim portion and an inner rim portion of a spoke portion of an automobile wheel constituted by a rim portion and a spoke portion, To reduce the weight and noise of the automobile wheel and to reduce the vibration and noise generated during running of the vehicle by inserting the damper rubber into the cavity, will be.

At present, automotive wheels are made from metallic materials, usually steel or aluminum. These wheels are generally secured to the wheel mountings on the vehicle, which are comprised of brake drums or brake discs, by means of spherical head screws or conical head screws.

However, in order to improve the fuel efficiency of the automobile by reducing the weight of the automobile, the automobile wheel adopts a lightweight aluminum material as well as a technique for reducing the structural weight.

The structure such as the thickness and the design of the hub mounting portion 21 and the spoke portion 22 of the disk member 2 are designed so that the strength of the wheel is generally satisfied when the wheel is designed, The hub mounting portion 21 of the wheel, and the inner side portion of the spoke portion 22 so as to improve the fuel economy through secondary weight reduction (weight reduction).

However, since the weight of the wheel is lighter, the stiffness is insufficient. As a result, the wheel itself vibrates and becomes noisy when the vehicle travels. To prevent this, the hub mounting portion 21 and the spoke portions 22 ) Of the design member (2), thereby increasing the weight of the design member (2) and increasing the fuel consumption.

As described above, Korean Patent Laid-Open No. 10-2006-0044653 (hereinafter referred to as "Prior Art 1") discloses a technique of forming a hollow chamber in the rim to reduce weight and cut off noise. In addition to the prior art document 1, Korean Patent Laid-Open Publication No. 1999-0062973 and Japanese Patent Laid-Open Publication No. 10-2013-0044465 disclose a technique for forming a hollow in the rim and spoke. There is a problem that the durability is weakened although it is effective for sound absorption.

In Korean Patent Laid-Open Publication No. 10-2007-0053386 (hereinafter referred to as Prior Art 2), a technique has been proposed in which a hollow chamber is formed in the rim and an aluminum foam core is filled therein to absorb noise and vibration. The above-described technology of forming a hollow in the rim and spoke and filling the foam core with the hollow has a problem that the sound absorption effect is higher than that of the prior art document 1, but the effect of weight reduction is not significant.

Prior Art 1: Korean Patent Publication No. 10-2006-0044653 Prior Art 2: Korean Patent Publication No. 10-2007-0053386 Prior Art 3: Korean Patent Publication No. 1999-0062973 Prior Art 4: Korean Patent Publication No. 10-2001-0072401

SUMMARY OF THE INVENTION The present invention has been conceived to solve the above-mentioned problems, and an object of the present invention is to solve the problem of reducing the weight while maintaining the same stiffness of an automobile wheel having an inner rim portion formed therein.

In addition, the present invention is intended to solve the problems that the manufacturing of the sound absorbing material, the hollow formation, and the filling of the foaming alloy with the sound absorbing material are easy, and the causticity ratio is high, and the vibration and noise reduction effect are obtained.

In order to achieve the above object, according to the present invention, there is provided an automobile wheel including a disk member (2) to which an axle is connected and a rim member (3) to which a tire is mounted, wherein the rim member (3) And a cavity portion 37 is formed along the circumference of the cavity portion, and undercuts 38 and 39 are formed at the cavity portion entrance, and the damper rubber 4 is inserted into the cavity portion.

Further, the cavity portion is characterized in that the cross section is any one of a circle, an ellipse, and a polygon.

The cavity portion 37 is formed continuously or continuously in the entire circumference of the inner rim portion 36 along the circumference of the inner rim portion 36 without interruption, Is inserted between the entirety of the cavity (37), or inserted only for one minute.

The damper rubber may be a rubber material such as chloroprene rubber (CR), nitrile rubber (NBR), ethylene propylene rubber (EPDM), flow rubber (FPM), polybutadiene rubber (BR), styrene butadiene rubber (SBR) ) Or a chlorosulfonated polyethylene rubber (CSM).

The undercut is also characterized by a first undercut (38) extending from the well (33) and a second undercut (39) extending from the spokes (22).

The first undercut 38 may include a well protrusion 381 protruding inward to reduce the inner diameter of the inner wall of the well portion 33, A first inclined portion 382, and a first engaging step 383 extending downwardly from the first inclined portion.

The second undercut 39 includes a curved portion 391 bent downward from the inner surface of the spoke 22 and a second inclined portion 392 extending from the curved portion to be inclined upward in the outward direction to expand the inner diameter, And a second latching jaw portion 393 extending upwardly and inclined to the above-mentioned recessed portion.

In addition, the damper rubber inserted into the cavity is inserted to correspond to the second undercut of the spoke portion.

The automobile wheel having the hollow portion in the inner rim according to the present invention having the above-described features forms a hollow portion in the inner side portion of the rim portion and the spoke portion, that is, the inner rim portion, and by inserting the damper rubber thereto, stiffness, while reducing the weight by about 10 to 15%.

In addition, the present invention has the effect of dramatically attenuating vibrations and noise generated during driving of the vehicle through the damper rubber.

Further, by forming the undercut at the entrance of the cavity portion, the noise can be effectively guided to the cavity portion side.

In addition, the damper rubber can be effectively inserted by forming the undercut at the cavity portion entrance, and it is also easy to replace the damper rubber when the hardening change (secular change) occurs due to hardening of the damper rubber.

Fig. 1 is a cross-
Fig. 2 is a sectional view and an enlarged view of a vehicle wheel according to an embodiment of the present invention; Fig.
Fig. 3 is an enlarged view of another embodiment of the automobile wheel according to the present invention
Fig. 4 is a partial enlarged view of another embodiment of the automobile wheel according to the present invention
Fig. 5 is a view showing an example of insertion of a damper rubber of an automobile wheel according to the present invention
6 is a cutaway perspective view of the automobile wheel according to the present invention.
Fig. 7 and Fig. 8 are exemplary views showing an embodiment of an automobile wheel according to the present invention

The term used in the present invention is a general term that is widely used at present. However, in some cases, there is a term selected arbitrarily by the applicant. In this case, the term used in the present invention It is necessary to understand the meaning.

In the description of this embodiment, the face on the side that can be seen by the eye when mounted on a vehicle is referred to as a design surface, and the design surface side is referred to as a surface side, and the opposite side to the design surface is referred to as a back surface side.

The direction toward the center axis L of the vehicle wheel is referred to as the inside, the reverse direction is referred to as the outside, and the up and down directions refer to the attitude in which the back side faces the ground, that is, the attitude in which the surface side faces the sky.

Hereinafter, the technical structure of the present invention will be described in detail with reference to preferred embodiments shown in the accompanying drawings.

Fig. 1 is a view showing a typical automobile wheel, in which a rim portion and an inner rim portion of a spoke portion, that is, an inner rim portion, are formed in a solid shape filled with a hollow.

This is because the portion of the car wheel connected to the axle (not shown) receives a load of the cantilever beam as a supporting end, so that it is designed to have strength at the hub mounting portion and the spoke portion, and the vehicle self weight and impact load So as to have a tolerable stiffness.

Referring to FIGS. 1 and 2, an automobile wheel in which an inner rim portion according to the present invention has cavities is provided with an inner rim part, that is, an inner rim part. do.

In other words, in the present invention, the inner rim portion refers to the rim portion and the spoke portion boundary inner portion (see Figs. 1 and 2).

The automobile wheel of the present invention is integrally molded by casting an aluminum alloy, and has a disc member 2 to which an axle is connected and a rim member 3 to which a tire is mounted.

When the tire 1 is mounted on the automobile wheel, an annular tire chamber sealed by the rim member 3 and the tire is formed.

The disc member 2 has a substantially disk-shaped hub mounting portion 21 and a plurality of spoke portions 22 radially outwardly from the outer peripheral edge of the hub mounting portion 21 . A hub hole 210 is formed at the center of the hub mounting portion 21 and a plurality of bolts 210 are provided at a position outside the hub hole 210 at equal intervals in the peripheral direction A hole 220 is formed. Further, a decorative hole 23 is formed between the spoke portions 22 adjacent to each other.

Further, the spoke portion 22 and the spoke extension portion 22a extending from the ornamental hole 23 and connected to the rim member are formed in a circular shape.

1 and 2, the rim member 3 has a front surface side flange 31a for holding the beads 11a and 11b of the tire 1 from the side and a front surface side flange 31b for holding the beads 11a and 11b of the tire 1 from both sides, Side flange 31b is formed. The front side bead sheet 32a and the back side bead seat 32b are formed so that the beads 11a and 11b of the tire are seated and supported and fixed so as to be coupled to the front side / back side flanges 31a and 31b .

A well portion 33 having a diameter smaller than that of the front side bead sheet is formed between the front side bead sheet 32a and the back side bead seat 32b so as to allow the bead of the tire to come off when the tire is mounted . A well wall portion 34 is formed so as to connect the surface side bead sheet 32a having different diameters to the well portion 33. [

The outer side portion of the well portion 33 forms an annular outer rim portion 35 and a surface side bit 34 through the well wall portion 34 while forming a well wall portion 34 extending outwardly. Thereby forming a sheet 32a.

The front surface side bit sheet 32a is coupled with the spoke portion 22 while continuing to form the front surface side flash portion 31a.

On the other hand, the inner side portion of the well portion 33 is coupled with the inner end portions of the spoke portion 22 and the decorative hole 23 to form an inner rim portion 36.

2, the well wall portion 34, the outer rim portion 35, and the surface side bead sheet 32a are located on the outer side corresponding to the inner rim portion 36. As shown in Fig.

An embodiment according to the present invention makes it possible to reduce the overall weight of the automobile wheel by forming the cavity portion 37 in the inner rim portion 36. [

This is because when the wheel is designed, the inner rim portion 36 is not an important factor in the strength design and is not hampered by the strength even if the cavity portion 37 is formed.

That is, the strength is determined by designing the structure such as thickness and design of the hub mounting portion 21 and the spoke portion 22 of the disk member 2 to satisfy the minimum required strength condition of the wheel, And the cavity portion 37 formed in the rim portion 36 is formed to absorb the vibration impact generated in the tire.

To this end, the cavity (R) is formed with an annular opening along the annular cavity, and the size of the inlet is smaller than that of the cavity.

As a result, the noise passing through the narrow entrance can not escape through the narrow entrance after entering into the widely formed cavity, and is canceled inside the cavity.

More specifically, by setting the shape and dimensions of the cavity and the inlet (R) so that the cavity functions as a Helmholtz-type resonant sound absorbing device, A kind of noise) can be reduced.

That is, since the frequency of a sound wave that can be attenuated is determined according to the volume of the cavity portion, the diameter of the opening of the inlet R, etc., the cavity portion has a specific frequency band (for example, 180 Hz to 270 Hz) The volume of the cavity and the opening diameter of the inlet are set so that the sound wave of the inlet can be attenuated.

Therefore, referring to FIGS. 3 and 4, the cavity is not particularly limited as long as it has a structure in which the cross section can be offset in a cavity having a wide noise such as a circular, elliptical, or polygonal shape.

The cavity portion 37 is formed continuously or continuously in the circumference of the inner rim portion 36 without interruption along the circumference of the inner rim portion 36.

Figure # shows that the cavity 37 is formed continuously along the circumference of the inner rim portion 36 without interruption between the front and rear rims of the inner rim portion 36, , And is formed only on the spoke portion 22. As shown in Fig.

However, it is noted that the cavity portion 37 may be formed only in the spoke portion 22, but may be formed only in the remaining portion except the spoke portion.

5 and 6, a damper rubber (4) may be further inserted into the cavity to absorb not only noise but also shock absorption and shock absorbing function.

For this purpose, the damper rubber is preferably made of rubber such as chloroprene rubber (CR), nitrile rubber (NBR), ethylene propylene rubber (EPDM), flow rubber (FPM), polybutadiene rubber (BR), styrene butadiene rubber (SBR) IIR) or chlorosulfonated polyethylene rubbers (CSM). Since the physical properties of the rubber are well known, a detailed description thereof will be omitted.

Here, the damper rubber inserted into the hollow portion 37 may be inserted between the entire length of the hollow portion 37, or inserted only for one minute.

The figure # indicates that the cavity # is inserted into the entire section where the cavity section 37 is formed, and # shows that the cavity section is partially inserted by being inserted into only one section of the entire section of the cavity section 37, And indicates that a plurality of insertion holes are inserted.

On the other hand, undercuts 38 and 39 can be formed at the inlet R of the cavity portion to facilitate insertion or removal of the damper rubber 4 into the cavity portion 37.

The undercut consists of a first undercut 38 extending from the well portion 33 and a second undercut 39 extending from the spokes 22.

The first undercut 38 includes a well protruding portion 381 protruding inward from the inner surface of the well portion 33, a first inclined portion 382 extending upwardly from the protruding portion to extend the inner diameter, And a first latching jaw portion 383 extending downwardly from the first inclined portion.

The protrusion 381 protrudes inward from the inner surface of the protrusion 381, thereby increasing the thickness of the protrusion 381 and increasing the rigidity of the wheel.

2 to 4, the first inclined portion 382 is formed to extend in the outward direction so as to extend to the protruding portion of the well and to extend the inner diameter, so that when the damper rubber is inserted into the cavity portion, And is inserted into the cavity portion while being compressed into the cavity portion entrance while sliding on the first inclined portion with the hinge point 393 as a hinge point.

Further, it functions as an induction surface for naturally inducing noise to the cavity portion side.

The first latching protrusion 383 is formed to be inclined downwardly from the first inclined portion so that the inserted damper rubber can not be detached by the magnetic force during running.

The second undercut 39 includes a curved portion 391 formed to be curved downward on the inner side of the spoke 22, a second inclined portion 392 extending to the curved portion and formed to be inclined upwards in the outward direction to expand the inner diameter, And a second latching jaw 393 extending from the second inclined portion and inclined upward.

The curved portion 391 is formed to be curved downward from the inner surface of the spokes 22 so that the second hooking jaw 393 functions as a hinge point when the damper rubber is inserted and functions to guide the entry of the damper rubber, To the first inclined portion 382 side.

The second inclined portion 392 is formed to extend in the curved portion and extend upward in the outward direction so as to extend the inner diameter, and functions as a hinge point when the damper rubber is slidably inserted into the cavity while rotating on the first inclined portion.

The second latching jaw 393 is extended to the second inclined portion so as to be inclined upward so that the inserted damper rubber can not be detached by the magnetic force during running.

5, the second undercut 39 is formed in each of the plurality of spoke portions 22, and the well portion 33, to which the ornamental hole 23 is coupled, The operator first inserts the annular damper rubber into one of the second undercuts as described above, and inserts the annular damper rubber sequentially in the clockwise or counterclockwise direction.

Meanwhile, when the damper rubber is lost due to hardening or contamination due to a secular change due to the use of the wheel, it is inevitable to replace the damper rubber when removing the damper rubber. The second engaging jaw 393 is rotated to the hinge point in the reverse order of insertion after insertion into the rubber, so that forced removal can be easily performed.

On the other hand, the damper rubber may be of a single shape corresponding to the cavity, but may be inserted only in the cavity formed with the second undercut of the spoke.

That is, when the damper rubber is formed in a bar shape instead of a toroidal shape and inserted only in the cavity where the second undercut is formed, the damper rubber can be intermittently formed in the stagnant cavity portion when viewed from the whole of the wheel.

As a result, the ease of insertion of the damper rubber is ensured, the weight of the wheel is further reduced, and the vibration absorbing damping function as well as the shock absorbing and buffering function are increased through the regular arrangement of the cavity portion and the damper rubber.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the present invention. Various modifications and variations will be possible without departing from the spirit of the invention. Therefore, the scope of the present invention should be construed as being covered by the scope of the appended claims, and technical scope within the scope of equivalents thereof should be construed as being included in the scope of the present invention.

1: Tire
2: disc member
21: hub mounting portion 22: spoke portion 23: decorative ball
3: rim member
31: flange 32: bead seat 33:
34: well wall 35: outer rim 36: inner rim
37: Cavity portion 38: 1st undercut 39: 2nd undercut
4: Damper rubber

Claims (9)

A vehicle wheel comprising a disc member (2) to which an axle is connected and a rim member (3) to which a tire is mounted,
A hollow portion 37 is formed along the circumference of the inner rim portion 36 of the rim member 3,
An undercut (38, 39) is formed in the cavity entrance,
The damper rubber (4) is inserted into the cavity portion,
The hollow portion 37 is formed continuously or continuously in the circumferential direction of the inner rim portion 36 without interruption along the circumference of the inner rim portion 36,
Wherein the damper rubber inserted into the cavity portion (37) is inserted into the cavity of the cavity portion (37), or inserted only in a part of the cavity portion (37)
The method according to claim 1,
Characterized in that the cavity portion has a circular cross section, an elliptical cross section or a polygonal cross section,
delete delete The method according to claim 1,
Characterized in that the undercut comprises a first undercut (38) extending from the well portion (33) and a second undercut (39) extending from the spokes (22).
The method of claim 5,
The first undercut 38 includes a well protrusion 381 protruding inward to reduce the inner diameter at the inner side of the well portion 33,
A first inclined portion 382 extending in the outward direction so as to extend the inner diameter and extending to the well projecting portion,
And a first engaging jaw (383) extending downwardly from the first inclined portion and being inclined downward.
The method of claim 5,
The second undercut 39 includes a curved portion 391 bent downward from the inner side of the spoke 22,
A second inclined portion 392 formed to extend upward in the outward direction to extend the inner diameter,
And a second engaging jaw portion (393) extending from the second inclined portion and inclined upwardly.
The method of claim 5,
And the damper rubber inserted into the cavity is inserted to correspond to the second undercut of the spoke portion.
The method according to any one of claims 1, 2, and 5 to 8,
The damper rubber may be made of rubber such as chloroprene rubber (CR), nitrile rubber (NBR), ethylene propylene rubber (EPDM), flow rubber (FPM), polybutadiene rubber (BR), styrene butadiene rubber (SBR) And a chlorosulfonated polyethylene rubber (CSM) is contained in the inner rim portion.

Images