KR101666808B1 - Bead structure manufacturing method of heavy duty tires - Google Patents
Bead structure manufacturing method of heavy duty tires Download PDFInfo
- Publication number
- KR101666808B1 KR101666808B1 KR1020150109297A KR20150109297A KR101666808B1 KR 101666808 B1 KR101666808 B1 KR 101666808B1 KR 1020150109297 A KR1020150109297 A KR 1020150109297A KR 20150109297 A KR20150109297 A KR 20150109297A KR 101666808 B1 KR101666808 B1 KR 101666808B1
- Authority
- KR
- South Korea
- Prior art keywords
- bead
- turn
- carcass
- bead core
- edge portion
- Prior art date
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Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C15/00—Tyre beads, e.g. ply turn-up or overlap
- B60C15/02—Seating or securing beads on rims
- B60C15/028—Spacers between beads
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D30/00—Producing pneumatic or solid tyres or parts thereof
- B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
- B29D30/48—Bead-rings or bead-cores; Treatment thereof prior to building the tyre
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C15/00—Tyre beads, e.g. ply turn-up or overlap
- B60C15/0009—Tyre beads, e.g. ply turn-up or overlap features of the carcass terminal portion
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C15/00—Tyre beads, e.g. ply turn-up or overlap
- B60C15/06—Flipper strips, fillers, or chafing strips and reinforcing layers for the construction of the bead
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C15/00—Tyre beads, e.g. ply turn-up or overlap
- B60C15/06—Flipper strips, fillers, or chafing strips and reinforcing layers for the construction of the bead
- B60C2015/0617—Flipper strips, fillers, or chafing strips and reinforcing layers for the construction of the bead comprising a cushion rubber other than the chafer or clinch rubber
- B60C2015/0621—Flipper strips, fillers, or chafing strips and reinforcing layers for the construction of the bead comprising a cushion rubber other than the chafer or clinch rubber adjacent to the carcass turnup portion
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Tyre Moulding (AREA)
Abstract
Description
The present invention relates to a method of manufacturing a pneumatic tire for heavy loads, and more particularly, to a method of manufacturing a bead structure for a heavy duty tire, which not only improves the durability of the bead portion but also prevents abrasion between the bead core and the carcass.
As is well known, heavy-duty radial tires used in trucks and buses include a tread contacting a road surface, both sidewalls connected to the tread to form a side portion of the tire, and a pair And a carcass which is a skeleton structure of a tire arranged between the bead portions so as to surround the bead core.
5, the
That is, in the conventional bead structure of the heavy duty tire, the turn-up edge portion of the
Recently, among the specifications of heavy duty tires, tires having a low flatness ratio are increasing, and as the section height of a tire is lowered, the turn-up edge of the
Further, there is a disadvantage that the separations occurring at the turn-up edge of the
Accordingly, the present invention has been made in view of the above-described problems, and it is an object of the present invention to provide a tire having improved durability of a tire by preventing mechanical deformation of a carcass ply and preventing wear between bead cores and carcass, And it is an object of the present invention to provide a method for manufacturing a bead structure of a heavy duty tire.
According to another aspect of the present invention, there is provided a method of manufacturing a bead structure for a heavy duty tire in which a periphery of a bead core is turned up by a turning-up edge portion of a carcass to manufacture a bead portion, A first step of integrally adhering and manufacturing; A second step of plastic-deforming the turn-up edge portion so that joint portions are formed at an angle corresponding to the shape of the first bead core; The first bead setter and the turn-up fingers are advanced to turn up the turn-up edge portion of the carcass to the first bead core, and the turn-up edge portion of the carcass located in the forming primary drum is turned downward to the lower side of the first bead core, step; A fourth step of positioning the first bead core in the turned-down carcass, retracting the first bead setter and the turn-up finger, and maintaining the bead filler with the second bead core and the second bead setter in a standby state; A fifth step of expanding the turn-up bladder at the turn-up edge portion of the carcass wrapped around the first bead core seated on the formed primary drum to turn up the turn-up edge portion of the carcass; A sixth step of pressing the turned-up edge portion of the turned-up carcass into a press roll to completely adhere to the first bead core; A seventh step in which the bead filler having the second bead core moves by the second bead setter and is seated at the center of the first bead core; And a step of expanding and pressing the turn-up edge portion of the carcass turned up between the first bead core and the second bead core and the bead filler by a turn-up bladder.
delete
The tire manufactured by the method of manufacturing the bead structure of the heavy duty tire according to the present invention prevents the mechanical deformation of the carcass ply and the wear between the bead core and carcass to improve the durability of the bead portion and ultimately improve the durability and life of the tire Effect.
1 is a partial cross-sectional view of a tire for heavy duty manufactured by the bead structure manufacturing method according to the present invention, which is a sectional view showing a bead structure,
Figs. 2 (A) to 2 (G) are cross-sectional views showing a procedure for manufacturing a bead structure of a tire according to the present invention,
3 is a partial sectional view of a heavy duty tire showing another embodiment of the present invention,
4 is an enlarged cross-sectional view of the strip rubber applied to the present invention,
5 is a partial cross-sectional view of a conventional heavy duty tire.
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It is needless to say that the technical spirit of the present invention is not limited to the following preferred embodiments, and can be practiced by those skilled in the art.
In addition, the present invention discloses that a conventional hexagonal bead core can be used to manufacture a heavy-duty tire without further modification of a manufacturing facility.
The bead structure of the heavy duty tire manufactured by the bead structure manufacturing method according to the present invention is characterized in that the turn-up
Here, the
The
A method of manufacturing a heavy duty tire having a bead structure according to the present invention will now be described with reference to FIG.
First, as shown in Fig. 2 (A), a known large-diameter forming
The turn-up
Turn-up
Then, the
2 (D), after the
2 (E), the pressing operation of the
2 (F), the
The turn-up
That is, the manufacturing process of the present invention, which is manufactured in the above-described manner, will be described again. The tire for heavy load, which makes up the
After the eighth step, the heavy duty tire is manufactured by applying the tire semi-finished products as known in the art.
In the first step, when the
The turn-up
In the method of manufacturing a bead structure for a heavy duty tire according to the present invention, since the turn-up edge portion of the carcass and the strip rubber are disposed between the two bead cores, contact wear between the wire of the bead core and the cord steel It is possible to prevent mechanical deformation of the carcass and to enhance the durability of the tire bead portion.
1: Bead portion, 1a: First bead core,
1b: second bead core, 1c: bead wire,
2: Carcass, 2a: Carcass fly,
2b: turn up edge portion, 2c: joint portion,
3: strip rubber, 4: bead filler,
5: forming primary drum, 6: turn-up bladder,
7: Turn-up finger,
8a: a first bead setter ring,
8b: second bead setter, 9: roll over can,
10: Press roll.
Claims (7)
A first step of integrally attaching a strip rubber (3) to the turn-up edge portion (2b) of the carcass (2); A second step of plastic-deforming the turn-up edge portion 2b such that the joint portions 2c are formed at an angle corresponding to the shape of the first bead core 1a; The first bead setter 8a and the turn-up fingers 7 are advanced to turn on the turn-up edge portion 2b of the carcass 2 to the first bead core 1a, A third step of turning down the turn-up edge portion 2b of the carcass 2 located below the first bead core 1a; The first bead setter 8a and the turn-up fingers 7 are moved backward and the bead filler 4b with the second bead core 1b is positioned on the carcass 2, ) And the second bead setter 8b in a standby state; The turn-up bladder 6 is inflated by the turn-up edge portion 2b of the carcass 2 wrapped around the first bead core 1a that is seated on the forming primary drum 5, A fifth step of turning up the part 2b; A sixth step of pressing the turned-up edge portion 2b of the turned up carcass 2 to the press roll 10 so as to completely adhere to the first bead core 1a; The seventh step in which the bead filler 4 having the second bead core 1b is moved by the second bead setter 8b and seated at the center of the first bead core 1a; The turn-up edge portion 2b of the carcass 2 turned up between the first bead core 1a and the second bead core 1b and the bead filler 4 are expanded and compressed by the turn- Wherein the step of preparing the bead structure comprises the steps of:
In the first step, when the strip rubber 3 is integrally attached to the end of the turn-up edge portion 2b of the carcass 2, the end surface of the strip rubber has a right triangle shape or a straight shape Wherein the bead structure is made of a synthetic resin.
Wherein the turn-up edge portion (2b) of the carcass (2) disposed between the first bead core (1a) and the second bead core (1b) is fitted in the horizontal direction. Way.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020150109297A KR101666808B1 (en) | 2015-08-03 | 2015-08-03 | Bead structure manufacturing method of heavy duty tires |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020150109297A KR101666808B1 (en) | 2015-08-03 | 2015-08-03 | Bead structure manufacturing method of heavy duty tires |
Publications (1)
Publication Number | Publication Date |
---|---|
KR101666808B1 true KR101666808B1 (en) | 2016-10-17 |
Family
ID=57250123
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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KR1020150109297A KR101666808B1 (en) | 2015-08-03 | 2015-08-03 | Bead structure manufacturing method of heavy duty tires |
Country Status (1)
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KR (1) | KR101666808B1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101922349B1 (en) * | 2017-10-23 | 2019-02-20 | 금호타이어 주식회사 | Heavy duty radial tire with improved durability |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006123765A (en) * | 2004-10-29 | 2006-05-18 | Yokohama Rubber Co Ltd:The | Heavy duty pneumatic tire |
JP2006240384A (en) * | 2005-03-01 | 2006-09-14 | Sumitomo Rubber Ind Ltd | Tire for heavy load |
KR101069319B1 (en) | 2008-12-02 | 2011-10-05 | 한국타이어 주식회사 | Heavy duty vehicle tire improved bead member |
KR101231729B1 (en) | 2010-12-08 | 2013-02-15 | 한국타이어월드와이드 주식회사 | Vehicle tire improved bead member |
-
2015
- 2015-08-03 KR KR1020150109297A patent/KR101666808B1/en active IP Right Grant
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006123765A (en) * | 2004-10-29 | 2006-05-18 | Yokohama Rubber Co Ltd:The | Heavy duty pneumatic tire |
JP2006240384A (en) * | 2005-03-01 | 2006-09-14 | Sumitomo Rubber Ind Ltd | Tire for heavy load |
KR101069319B1 (en) | 2008-12-02 | 2011-10-05 | 한국타이어 주식회사 | Heavy duty vehicle tire improved bead member |
KR101231729B1 (en) | 2010-12-08 | 2013-02-15 | 한국타이어월드와이드 주식회사 | Vehicle tire improved bead member |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101922349B1 (en) * | 2017-10-23 | 2019-02-20 | 금호타이어 주식회사 | Heavy duty radial tire with improved durability |
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