KR102691967B1 - Tires with grooves with multi-step wall patterns for noise reduction - Google Patents

Abstract

One embodiment of the present invention provides a tire having grooves formed with a multi-step wall pattern for noise reduction. A tire having grooves formed with a multi-step wall pattern for noise reduction according to an embodiment of the present invention includes grooves provided along a circumferential direction between tread blocks of the tire; and a plurality of stepped portions from the upper end of the groove to the lower end.

Description

Tires with grooves with multi-step wall patterns for noise reduction {Tires with grooves with multi-step wall patterns for noise reduction}

The present invention relates to a tire having a groove formed with a multi-step wall pattern for noise reduction, and more specifically, to a tire having a groove formed with a multi-step wall pattern for noise reduction in which a noise reduction structure is formed in the groove. will be.

A pneumatic tire consists of an inner liner that makes up the inside of the tire, a body ply that is laminated on the outside of the inner liner, a belt that is laminated on the outside of the body ply, a tread that is laminated on the outside of the belt, a side wall that makes up both sides of the tire, and a wheel. It consists of beads that are bonded to.

The tread that contacts the road surface of these pneumatic tires forms a specific pattern for traction, drainage, braking power, noise dispersion, etc., and depending on the shape of the pattern, it has a significant impact on rain, snow, and handling performance. This is a major factor in tire development.

In general, a car that moves forward by rolling its wheels inevitably generates noise. However, noises such as engine noise and wind noise (e.g. wind noise) coming from inside and outside the vehicle while driving are always annoying to the ears of the driver and passengers. Accordingly, work is done to block noise using soundproofing and sound-absorbing materials.

Recently, the requirements of the truck and bus tire market are gradually increasing from primary performance (durability, wear) to secondary performance (RR, Wet, PBN, R&H, etc.). In particular, as interest in and demand for electric (EV) trucks and buses has increased globally, including in the European and Chinese markets, the importance of not only basic wear and durability performance, but also noise, unlike vehicles with internal combustion engines, is also increasing.

Since tire noise is the highest among all noises in vehicles, tire noise will become the most important issue in the electric truck and bus industry in the future, creating structural problems for noise reduction.

KR 10-2149241 B1

The purpose of the present invention to solve the above problems is a multi-step wall pattern for noise reduction that further reduces noise generated between the road surface and tires by splitting and dispersing noise waves generated in the tire grooves. The aim is to provide a tire having this formed groove.

The technical problem to be achieved by the present invention is not limited to the technical problem mentioned above, and other technical problems not mentioned can be clearly understood by those skilled in the art from the description below. There will be.

The configuration of the present invention for achieving the above object includes a groove provided along the circumferential direction between the tread blocks of the tire; and a plurality of stepped portions from the upper end to the lower end of the groove.

In one embodiment of the present invention, the plurality of step portions form a step shape from the bottom to the top of the groove, and may each include a plurality of protruding surface portions spaced apart from each other along the circumferential direction of the groove.

In one embodiment of the present invention, the protruding surface portion is divided and disposed to increase in number from the top to the bottom of the plurality of steps, and may include protruding pieces with reduced width and area.

In one embodiment of the present invention, the protruding surface portion may be formed to protrude 1.5 mm to 2 mm from the step portion.

In one embodiment of the present invention, the plurality of stepped portions may be formed at a mutual step interval of 2 mm to 3 mm along the front direction.

In one embodiment of the present invention, the plurality of stepped portions may be disposed on one inner surface of the groove and may further include protrusions disposed on the other inner surface of the groove.

The effect of the present invention according to the above configuration is that a multi-step wall pattern is formed for noise reduction, which further reduces the noise generated between the road surface and the tire by splitting and dispersing the noise waves generated in the groove, which is the tire groove, than before. A tire having a groove can be provided.

The effects of the present invention are not limited to the effects described above, and should be understood to include all effects that can be inferred from the configuration of the invention described in the detailed description or claims of the present invention.

1 is a three-dimensional view of a portion of the tread of a tire having grooves in which a multi-step wall pattern is formed for noise reduction according to an embodiment of the present invention.
Figure 2 is an enlarged view of the step portion and the protruding surface portion of Figure 1.
Figure 3 is a cross-sectional view along the groove width direction of Figure 1.
Figure 4 is a three-dimensional view in the opposite direction of Figure 1.
Figure 5 is an enlarged view of the protrusion of Figure 4.

Hereinafter, the present invention will be described with reference to the attached drawings. However, the present invention may be implemented in various different forms and, therefore, is not limited to the embodiments described herein. In order to clearly explain the present invention in the drawings, parts unrelated to the description are omitted, and similar parts are given similar reference numerals throughout the specification.

Throughout the specification, when a part is said to be "connected (connected, contacted, combined)" with another part, this means not only "directly connected" but also "indirectly connected" with another member in between. "Includes cases where it is. Additionally, when a part is said to “include” a certain component, this does not mean that other components are excluded, but that other components can be added, unless specifically stated to the contrary.

The terms used in this specification are merely used to describe specific embodiments and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, terms such as “comprise” or “have” are intended to designate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, but are not intended to indicate the presence of one or more other features. It should be understood that this does not exclude in advance the possibility of the existence or addition of elements, numbers, steps, operations, components, parts, or combinations thereof.

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

Figure 1 is a partial three-dimensional view of the tread of a tire having a groove formed with a multi-step wall pattern for noise reduction according to an embodiment of the present invention, Figure 2 is an enlarged view of the step portion and protruding surface portion of Figure 1, and Figure 3 is a cross-sectional view along the groove width direction of FIG. 1.

1 to 3, a tire having grooves formed with a multi-step wall pattern for noise reduction according to an embodiment of the present invention has grooves provided along the circumferential direction between the tread blocks 10 of the tire. (20), and a plurality of step portions (100: 101, 102, 103) from the upper end to the lower end of the groove (20).

The plurality of step portions 100 (101, 102, 103) form a step shape from the bottom to the top of the groove 20, and a plurality of protruding surface portions 110 are provided to be spaced apart from each other along the circumferential direction of the groove 20. Each can be provided.

The protruding surface portion 110 may include a first protruding surface portion 111, a second protruding surface portion 112, and a third protruding surface portion 113 arranged from top to bottom.

The mini cuff 120 includes a first mini cuff 121 provided between the first protruding surface portions 111, a second mini cuff 122 provided between the second protruding surface portions 112, and a third mini cuff 122 provided between the first protruding surface portions 111. It may include a third mini cuff 123 provided between the protruding surface portions 113.

The groove 20 according to this embodiment arranges multi-level step portions 100 (101, 102, 103) on the wall of the groove 20, forms each mini-shaped protruding surface portion 110, and each step (Step) That is, it is a structure in which a mini cuff (120, Kerf) is inserted into each protruding surface portion (110). At this time, each step layer (100: 101, 102, 103) shows independent movement in the transverse force and running direction, so that the existing groove 20 and the existing single rib of each rib It distributes the movement, that is, the stress per unit area. The mini cuff 120 is a fine groove portion along the slope of the groove 20 provided between the protruding surface portions 111, 112, and 113 in each of the step portions 101, 102, and 103.

Referring to Figures 1 to 3, the protruding surface portions 110 (111, 112, 113) are divided and arranged so that the number increases from the top to the bottom of the plurality of step portions (100: 101, 102, 103), and the width and area are This may include reduced protruding pieces. Substantially, the protruding piece is a structure in which each protruding surface portion (110: 111, 112, 113) is divided into mini cuffs (120: 121, 122, 123).

In this embodiment, the protruding surface parts 110: 111, 112, 113 may be formed to protrude 1.5 mm to 2 mm from each step part 100: 101, 102, 103, and a plurality of step parts 100: 101 , 102, 103) may be formed with a mutual step spacing of 2 mm to 3 mm along the front direction. That is, the protruding surface portions 110 (111, 112, 113) protrude 2 mm to 3 mm more at each step from the top to the bottom, forming a multi-step shape. In this way, the plurality of step portions 100 (101, 102, 103) are arranged in an inclined step shape from the top to the bottom, and the relative protrusion interval may be 2 mm to 3 mm.

According to this, the noise of air passing through the groove 20 is dispersed by providing a depth difference in the upper and lower positions to each step portion 101, 102, and 103 according to the difference in the protrusion shape of the protruding surface portions 111, 112, and 113. This allows you to reduce the frequency noise related to resonance.

Figure 4 is a three-dimensional view in the opposite direction of Figure 1, and Figure 5 is an enlarged view of the protrusion of Figure 4.

3 to 5, the plurality of step portions 100 are disposed on one inner surface of the groove 20, and further include protrusions 130 (131, 132) disposed on the other inner surface of the groove 20. It can be included.

These protrusions (130: 131, 132) may be provided in multiple rows, and may include, for example, a first protrusion (131) and a second protrusion (132) below it.

In this embodiment, the protruding portion of each step is given a depth of at least 1.5 mm to ensure a certain level of rigidity. In addition, the same depth can be given to the protrusion in the driving direction on the opposite side of the stepped wall. That is, the protrusions 130: 131, 132 may have a shape that protrudes more than 1.5 mm from one inner surface of the groove 20.

These protrusions (130: 131, 132) are along the traveling direction, and may have a length of at least 15 mm or more in the traveling direction and a height of 3 mm or more.

In this way, by installing protrusions 130 in the driving direction on the side wall opposite the stepped wall, it is possible to reduce the frequency of air flow in the other direction.

The structure proposed in this embodiment is to place a multi-layer in the existing TBR tire groove 20 and insert a kerf in each layer to separate the tire from each layer. It is a technology that can more efficiently control forces coming from outside.

In addition, the multi-layer of the multi-step distributes the force per unit area. At this time, the Kerf inserted into each layer has the effect of an existing Kerf, ensuring uniform wear progress, and is similar to the chip-cut that occurred in existing TBR tires. Even in the case of tearing, it is possible to have a higher safety factor compared to existing block shapes through even distribution of force.

In this embodiment, in order to reduce the air column resonance sound, the multi-stage protruding surface portion 110 is applied to the groove, which is the main groove of the tire, thereby reducing the volume in the main groove through the embossed knurling shape and further impeding the flow in the main groove to reduce air column resonance. peak can be reduced.

As described above, this embodiment provides two major effects: reduction of damage to the tire surface and noise reduction.

First, damage to the tire surface is reduced by minimizing the stress transmitted to the groove 20 by providing a multi-faceted kerf in the groove 20. In other words, by dispersing the size of the force per unit area transmitted to each Kerf due to the stepped multi-faceted Kerf, the tire surface is damaged due to groove cracks, irregular wear, and chip cuts in the groove 20. Damage can be reduced.

In addition, noise reduction is achieved by reducing the frequency of noise generated by resonance by simultaneously forming a zigzag partition wall on the side wall of the groove 20 formed by a stepped kerf. By forming a partition wall with protrusions 130 in the traveling direction on the side wall opposite to the groove 20, noise is reduced by further reducing the frequency.

The description of the present invention described above is for illustrative purposes, and those skilled in the art will understand that the present invention can be easily modified into other specific forms without changing the technical idea or essential features of the present invention. will be. Therefore, the embodiments described above should be understood in all respects as illustrative and not restrictive. For example, each component described as single may be implemented in a distributed manner, and similarly, components described as distributed may also be implemented in a combined form.

The scope of the present invention is indicated by the patent claims described below, and all changes or modified forms derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included in the scope of the present invention.

10: Tread block
20: groove
100: Step part
110: protruding face part
120: mini cuff
130: protrusion

Claims (6)

a groove provided along the circumferential direction between the tread blocks of the tire; and
It includes a plurality of stepped portions from the upper end to the lower end of the groove,
The plurality of stepped portions form a step shape from the bottom to the top of the groove, and each has a plurality of protruding surface portions spaced apart from each other along the circumferential direction of the groove,
A tire having a groove in which a multi-step wall pattern is formed for noise reduction, wherein the protruding surface portion is divided and arranged to increase in number from the top to the bottom of the plurality of steps, and includes protruding pieces with reduced width and area. .
delete delete In claim 1,
A tire having a groove formed with a multi-step wall pattern for noise reduction, wherein the protruding surface portion is formed to protrude 1.5 mm to 2 mm from the step portion.
In claim 1,
A tire having grooves formed with a multi-step wall pattern for noise reduction, characterized in that the plurality of step portions are formed with a mutual step interval of 2 mm to 3 mm along the front direction.
In claim 1,
The plurality of stepped portions are disposed on one inner surface of the groove,
A tire having a groove formed with a multi-step wall pattern for noise reduction, further comprising protrusions disposed on an inner surface of the groove.