阅读说明：本技术 轮胎均一性的校正鼓及包括其的轮胎均一性的校正设备 (Tire uniformity correction drum and tire uniformity correction apparatus including the same ) 是由 安英俊 于 2019-07-19 设计创作，主要内容包括：一种轮胎均一性的校正鼓包括：一低部鼓,与一轮胎的一内部圆周表面的一部分相接触；一上部鼓,设置为相对于所述低部鼓可上下移动且配置用以按压所述轮胎的所述内部圆周表面的另一部分,所述另一部分未与所述下部鼓相接触；及一液压驱动单元,配置用以连接所述上部鼓及所述下部鼓,并使所述上部鼓相对于所述下部鼓上下移动。所述上部鼓与所述轮胎的所述内部圆周表面的一接触面积小于所述下部鼓与所述轮胎的所述内部圆周表面的一接触面积。(A correcting drum for tire uniformity comprising: a low drum contacting a portion of an inner circumferential surface of a tire; an upper drum disposed to be movable up and down with respect to the lower drum and configured to press another portion of the inner circumferential surface of the tire, the other portion not being in contact with the lower drum; and a hydraulic drive unit configured to connect the upper drum and the lower drum and move the upper drum up and down with respect to the lower drum. A contact area of the upper drum with the inner circumferential surface of the tire is smaller than a contact area of the lower drum with the inner circumferential surface of the tire.)

1. A correction drum for tire uniformity characterized by: the calibration drum comprises

A low drum contacting a portion of an inner circumferential surface of a tire;

an upper drum disposed to be movable up and down with respect to the lower drum and configured to press another portion of the inner circumferential surface of the tire, the other portion not being in contact with the lower drum; and

a hydraulic drive unit configured to connect the upper drum and the lower drum and move the upper drum up and down with respect to the lower drum,

wherein a contact area of the upper drum with the inner circumferential surface of the tire is smaller than a contact area of the lower drum with the inner circumferential surface of the tire.

2. A drum for correcting tire uniformity as recited in claim 1, wherein: the upper drum includes:

a drum main body;

a heater provided in the drum main body so as to heat the drum main body; and

a plurality of thermal insulators provided at both ends of the drum main body in a circumferential direction.

3. A drum for correcting tire uniformity as recited in claim 2, wherein: a plurality of groove portions are formed at the both end portions in the circumferential direction of the drum main body, and the plurality of thermal insulators are mounted in the plurality of groove portions and fixed on the drum main body.

4. A drum for correcting tire uniformity as recited in claim 3, wherein: the calibration drum further comprises:

a plurality of fastening members configured to secure the plurality of thermal insulators to the drum body while passing through the plurality of thermal insulators into the drum body.

5. A drum for correcting tire uniformity as recited in claim 2, wherein: a plurality of circular portions are provided at both ends in a circumferential direction of the upper drum.

6. A tire uniformity correcting apparatus characterized in that: the apparatus includes:

a housing;

a tire uniformity correction drum as described in any one of claims 1 to 5 disposed in said housing;

a support configured to support the tire uniformity correction drum; and

a transfer unit slidably disposed at the housing, the transfer unit for transferring a tire to fix the tire on the tire uniformity correction drum.

7. A drum for correcting tire uniformity as recited in claim 6, wherein: the support member protrudes upward from a bottom surface of the casing, and supports the tire uniformity correction drum so as to be separated from the bottom surface of the casing by a predetermined distance.

8. A drum for correcting tire uniformity as recited in claim 6, wherein: the transfer unit includes:

a transfer plate having a surface configured to face a front surface of the tire uniformity correction drum;

a plurality of guide rods rotatably protruding from the surface of the transfer plate and configured to support the tire;

a plurality of handles passing through the transfer plate and configured to fix the plurality of guide bars corresponding to each other; and

a guide track engaging the transfer plate and the housing and configured to guide movement of the transfer plate.

Technical Field

The present disclosure relates to a tire uniformity correction drum and a tire uniformity correction apparatus including the tire uniformity correction drum.

Background

Generally, a pneumatic tire appears to have a uniform internal structure in a circumferential direction. However, the pneumatic tire has a non-uniformity due to limitations in design and various manufacturing processes. Thus, a uniformity of the tire indicates a degree of uniformity of the tire and is used to determine the quality of the tire.

With respect to a method for determining the uniformity of the tire, there is a Radial Force Variation (RFV) and a Lateral Force Variation (LFV), a static balance (S/B) and a dynamic balance (D/B), and a radial deflection (RRO) and a lateral deflection (LRO), the RFV and the LFV indicating a uniformity of stiffness, the S/B and the D/B indicating a uniformity of weight, the RRO and the LRO indicating a uniformity of size.

In between, the RFV indicates a change in the radial force of the tire. When a load is applied to the tire while rotating the tire in a state where a tire shaft is fixed, a vertical repulsive force between the tire and a drum is measured by mounting a load cell at an upper end and a lower end of a drum shaft. At this time, the variation of the repulsive force exhibits a regular fluctuation during a single rotation of the tire. The RFV is a difference value between a highest point and a lowest point of the fluctuation. Although the RFV particularly affects steering stability, vibration, tread wear, etc. of a vehicle, the RFV can improve a tire finish in poor quality.

As a conventional method for improving the uniformity, there is a grinding method for improving the RFV by grinding a shoulder portion of the tire corresponding to a peak point of the repulsive force in a radial direction of the tire with a grinder. However, the grinding method has disadvantages in that the outer surface of the tire is worn and a working environment is deteriorated due to dust of the tire. In addition, an additional process for removing the abrasive powder of the tire is required, thereby increasing a cycle time in a tire manufacturing process.

Therefore, there is a need for a tire uniformity correction apparatus that is effective in improving the tire uniformity.

Disclosure of Invention

In view of the above, the present disclosure provides a tire uniformity correction drum capable of improving uniformity of a tire, and a tire uniformity correction apparatus including the tire uniformity correction drum.

According to an aspect, there is provided a correction drum for tire uniformity, the correction drum comprising: a low drum contacting a portion of an inner circumferential surface of a tire; an upper drum disposed to be movable up and down with respect to the lower drum and configured to press another portion of the inner circumferential surface of the tire, the other portion not being in contact with the lower drum; and a hydraulic drive unit configured to connect the upper drum and the lower drum and move the upper drum up and down with respect to the lower drum, wherein a contact area of the upper drum with the inner circumferential surface of the tire is smaller than a contact area of the lower drum with the inner circumferential surface of the tire.

The upper drum may include: a drum main body; a heater provided in the drum main body so as to heat the drum main body; and a plurality of thermal insulators provided at both end portions in a circumferential direction of the drum main body.

A plurality of groove portions may be formed at the both end portions in the circumferential direction of the drum main body, and the plurality of thermal insulators may be mounted in the plurality of groove portions and fixed on the drum main body.

The tire uniformity correction drum may further comprise: a plurality of fastening members configured to secure the plurality of thermal insulators to the drum body while passing through the plurality of thermal insulators into the drum body.

A plurality of circular portions may be provided at both ends of the upper drum in a circumferential direction.

According to another aspect, there is provided a tire uniformity correction apparatus, the apparatus comprising: a housing; a correction drum of the above tire uniformity, provided in the casing; a support configured to support the tire uniformity correction drum; and a transfer unit slidably disposed at the housing, the transfer unit for transferring a tire to fix the tire on the correction drum for tire uniformity.

The support member may protrude upward from a bottom surface of the casing and support the tire uniformity correction drum so as to be separated from the bottom surface of the casing by a predetermined distance.

The transfer unit may include: a transfer plate having a surface configured to face a front surface of the tire uniformity correction drum; a plurality of guide rods rotatably protruding from the surface of the transfer plate and configured to support the tire; a plurality of handles passing through the transfer plate and configured to fix the plurality of guide bars corresponding to each other; and a guide rail engaging the transfer plate and the housing and configured to guide movement of the transfer plate.

The invention has the following effects:

the tire uniformity correction drum and the tire uniformity correction apparatus according to the embodiments of the present disclosure can easily improve the uniformity of the tire.

Drawings

Various objects and features of the present disclosure will become apparent from the following description of various embodiments, in view of the combination of the several drawings, in which:

FIG. 1 is a schematic perspective view of a tire uniformity correction apparatus according to one embodiment of the present disclosure;

FIG. 2 is a schematic cross-sectional view taken along a line A-A' in FIG. 1;

FIG. 3 is a schematic perspective view of a tire uniformity correction drum according to one embodiment of the present disclosure; and

fig. 4 is a schematic cross-sectional view taken along a line B-B' in fig. 3.

Detailed Description

First, it should be noted that terms or words used throughout the specification or claims should not be limited to their general definitions or lexical definitions, and may need to be understood through definitions and concepts corresponding to the technical spirit of the disclosure based on a principle that an inventor may appropriately define terms described in the present invention according to a best mode. Therefore, the embodiments of the present disclosure and the drawings are merely examples, and thus the technical spirit of the present disclosure may not be fully presented. Accordingly, it is to be understood that the scope of the present disclosure can be defined by various equivalents and modifications.

Hereinafter, various embodiments will be described in detail with reference to various drawings. Throughout the drawings, the same reference numerals will be used for the same components. Also, in the description of the present disclosure, a detailed description of known components or functions will be omitted if it is determined that the detailed description does not unnecessarily obscure the gist of the present invention. For the same reason, some components are exaggerated, omitted, or schematically illustrated in the various drawings. The dimensions of the individual components do not fully reflect the actual dimensions.

In the present specification, terms such as "upper", "lower", "side", and the like refer to directions in the drawings. These terms may be expressed differently when an object is changed in direction.

Fig. 1 is a schematic perspective view of a tire uniformity correction apparatus according to an embodiment of the present disclosure. Fig. 2 is a schematic cross-sectional view taken along a line a-a' in fig. 1.

Referring to fig. 1 and 2, a tire uniformity correction apparatus according to an embodiment of the present disclosure includes: a casing 100, a tire uniformity correction drum 200 disposed in the casing 100, a support 300 for supporting the tire uniformity correction drum 200, and a transfer unit 400 slidably disposed at the casing 100 to transfer and fix a tire on the tire uniformity correction drum.

The housing 100 may define an outer shape of a tire uniformity fixture 1, and the housing 100 may be fabricated, for example, using a metal casing. The casing 100 may have an inner space in which the correction drum 200 for improving the tire uniformity of the tire may be disposed.

The tire uniformity correction drum 200 is brought into contact with an inner circumferential surface of the tire and applies heat and pressure to reach a peak point of a Radial Force Variation (RFV) and its periphery, thereby improving the uniformity of the tire. For example, the tire uniformity correction drum 200 presses the tire with an upper drum 220, the upper drum 220 is connected to a lower drum 210 so as to be movable up and down with respect to the lower drum 210, and the lower drum 210 is in contact with a portion of the inner circumferential surface of the tire, thereby improving the uniformity of the tire. This will be described in detail later.

The support 300 may be disposed in the housing 100. The support 300 may protrude upward from a bottom surface of the casing 100 to support the tire uniformity correction drum 200 such that the tire uniformity correction drum 200 is spaced apart from the bottom surface of the casing 100 by a predetermined distance.

The transfer unit 400 may be provided to fix the tire on the tire uniformity correction drum 200. The transfer unit 400 may slide to or from the casing 100 to attach or detach the tire to or from the tire uniformity correction drum 200. The transfer unit may include, for example, a transfer plate having a surface disposed to face the tire uniformity correction drum 200, a plurality of guide rods 420 rotatably protruding from a surface of the transfer plate 410 and configured to support the tire, a plurality of handles 430 passing through the transfer plate 410 and configured to fix the respective corresponding guide rods, and a guide rail 440 engaging the transfer plate 410 and the housing 100 so as to guide the movement of the transfer plate 410.

A process of attaching the tire to the tire uniformity correction drum 200 by the transfer unit 400 will be described. First, the tire may be supported by the guide rods 420 while an outer circumferential surface of the tire is brought into contact with the guide rods 420. Then, the tire may be rotated while viewing the transfer plate 410 from a front side, so that a correction target position of the tire, for example, the peak point of the RFV, may be positioned at the 12 o' clock position. At this time, the tire may be rotated by the rotation of the plurality of guide rods 420. If the peak point of the RFV is positioned at the 12 o' clock position, the plurality of guide bars 420 and the tire may be fixed by the plurality of grips 420. Then, the transfer plate 410 is slid to the side of the housing 100 along the guide rail 440, and the tire uniformity correction drum 200 may be brought into contact with the inner circumferential surface of the tire. Through the above-described processes, the tire can be attached to the tire uniformity correction drum 200. Hereinafter, a configuration of the tire uniformity correction drum 200 according to the embodiment of the present disclosure will be described in detail with reference to fig. 3 and 4.

FIG. 3 is a schematic perspective view of a tire uniformity correction drum according to an embodiment of the present invention. Fig. 4 is a schematic cross-sectional view taken along a line B-B' in fig. 3.

Referring to fig. 3 and 4, according to the embodiment of the present disclosure, the tire uniformity correction drum 200 is provided to improve the uniformity of the tire by applying heat and pressure to the inner circumferential surface of the tire. For example, the tire uniformity correction drum 200 may include the lower drum 210, the upper drum 220, and a hydraulic drive unit 230, the lower drum 210 being in contact with a portion of the inner surface of the tire, the upper drum 220 being disposed to be movable up and down with respect to the lower drum 210 and configured to press another portion of the inner circumferential surface of the tire, which is not in contact with the lower drum 210, the hydraulic drive unit 230 being configured to connect the lower drum 210 and the upper drum 220 and move the upper drum 220 up and down with respect to the lower drum 210.

The lower drum 210 may be composed of metal and may be fixed to the support 300. An outer surface of the lower drum 210 may be curved to correspond to the circumferential surface of the tire. For example, the lower drum 210 may be formed in a horizontally extending cylindrical shape having an upper opening.

The hydraulic drive unit 230 may be provided in the lower drum 210. The hydraulic drive unit 230 may connect the lower drum 210 and the upper drum 220. When the hydraulic driving unit 230 is driven, the upper drum 220 may be moved up and down. The hydraulic drive unit 230 may be, for example, a hydraulic cylinder. The driving of the hydraulic drive unit 230 may be controlled by a controller (not shown). The controller may include a manipulation unit including one or more microprocessors, a memory, a communication unit, and the like. A configuration of the controller is well known in the art, and a detailed description thereof will be omitted.

When the tire is attached to the tire uniformity correction drum 200, the lower drum 210 may be in contact with a portion of the inner circumferential surface of the tire, i.e., a lower portion of the inner circumferential surface of the tire.

The heated upper drum 220 may press another portion of the inner circumferential surface of the tire, i.e., an upper portion of the inner circumferential surface of the tire, so as to improve the uniformity of the tire. The upper drum 220 may be composed of metal and may include, for example, a drum main body 221, the drum main body 221 defining an outer shape of the upper drum 220, a heater 222 provided in the drum main body 221 so as to heat the drum main body 221, and a plurality of heat insulators 223 provided at both ends of the drum main body in a circumferential direction. Here, the circumferential direction may be indicated as a direction extending along an outer circumferential surface of the tire uniformity correction drum in fig. 3.

The drum main body 221 may form the outer shape of the upper drum 220. The drum main body 221 is connected to the hydraulic driving unit 230 and is disposed at an upper side of the lower drum 210, and the lower drum 210 is cut and opened. An outer circumferential surface of the drum main body 221 may be curved to correspond to the inner circumferential surface of the tire. Accordingly, a combination of the upper drum 220 and the lower drum 210 may have a horizontally extending cylindrical shape. An upper surface of the drum main body 221 may be brought into contact with the inner circumferential surface of the tire and press the tire when the upper drum 220 is moved up and down by the hydraulic drive unit 230. Therefore, the uniformity of the tire can be improved. More specifically, when the heated drum main body 221 presses the inner circumferential surface of the tire, a plastic deformation occurs at a rim on a tire bead side. By using the drum main body 221 to plastically deform the rim on the tire bead side, the uniformity of the tire can be improved.

One or more of the heaters 222 for heating the drum main body 221 may be provided in the drum main body 221. The drum main body 221 may be heated by a plurality of the heaters 222. Therefore, when the drum main body 221 presses the inner circumferential surface of the tire, the inner circumferential surface of the tire can be plastically deformed by the heated drum main body 221. Therefore, the uniformity of the tire can be improved.

A circular portion R may be provided at the both end portions in the circumferential direction of the drum main body 221. By providing the plurality of the rounded portions R in the drum main body 221, it is possible to avoid the correction drum 200 of the tire uniformity according to an embodiment of the present disclosure from damaging the tire during the correction process of the tire uniformity. In other words, when the upper drum 220 is moved upward and presses the inner circumferential surface of the tire, a stress may be concentrated on portions of the inner circumferential surface of the tire, which are in contact with ends of the upper drum 220 and the lower drum 210 in a circumferential direction. By providing a plurality of the circular portions R at the both ends in the circumferential direction of the drum main body 221, the concentration of the stress on the inner circumferential surface of the tire can be reduced.

Further, the plurality of thermal insulators 223 may be provided at the both end portions in the circumferential direction of the drum main body 221 along the edge. For example, a plurality of groove portions 221a may be formed at the both ends in the circumferential direction of the drum main body 221, and the plurality of groove portions 221a extend in a width direction along the edge of the drum main body 221, and the plurality of heat insulators 223 are installed in the plurality of groove portions 221a and fixed on the drum main body 221 by, for example, a plurality of fastening members 224 passing through the plurality of heat insulators 223 into the drum main body 221. The plurality of thermal insulators 223 may be comprised of, for example, a Polyetheretherketone (PEEK) material. By providing the plurality of thermal insulators 223, it is possible to avoid an excessive deformation of the inner circumferential surface of the tire brought into contact with the both end portions of the drum main body 221.

The upper drum 220 may have a relatively small circumferential surface compared to a circumferential surface of the lower drum 210. Specifically, a contact area of the upper drum 220 brought into contact with the inner circumferential surface of the tire may be smaller than a contact area of the lower drum 210 brought into contact with the inner circumferential surface of the tire. Therefore, according to the embodiment of the present disclosure, the correction drum 200 using the tire uniformity can concentrate the application of heat and pressure to a portion of the tire that needs to be plastically deformed.

While the disclosure has been shown and described with respect to several embodiments, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the scope of the disclosure as defined in the following claims.