KR101666808B1 - Bead structure manufacturing method of heavy duty tires - Google Patents

Bead structure manufacturing method of heavy duty tires Download PDF

Info

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
Application number
KR1020150109297A
Other languages
Korean (ko)
Inventor
박준현
Original Assignee
한국타이어 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 한국타이어 주식회사 filed Critical 한국타이어 주식회사
Priority to KR1020150109297A priority Critical patent/KR101666808B1/en
Application granted granted Critical
Publication of KR101666808B1 publication Critical patent/KR101666808B1/en

Links

Images

Classifications

    • 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
    • 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
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Tyre Moulding (AREA)

Abstract

The present invention relates to a manufacturing method for a bead structure of a heavy tire, which improves the durability of a bead part and prevents abrasion between a bead core and a carcass. The manufacturing method for a bead structure of a heavy tire allows manufacture of a bead part (1) by turning up the edge of a bead core to a turn-up edge part (2b) of a carcass (2).

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a bead structure manufacturing method for heavy duty tires,

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 carcass 102 of the conventional heavy duty tire and the bead core 101a of the bead portion 101 are engaged with each other so that both ends of the carcass 102 surround the bead core 101a The durability of the bead portion 101 of the tire is mainly affected by the turned up ends of the carcass 102. [

That is, in the conventional bead structure of the heavy duty tire, the turn-up edge portion of the carcass 102 turns up at the center of the bead core 101a and is located outside the bead core 101a and the bead filler 104 , And the height thereof is set differently according to the tire standard.

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 carcass 102 is also lowered, but there is a limit.

Further, there is a disadvantage that the separations occurring at the turn-up edge of the carcass 102 structurally of the tire, as well as the height of the lower section of the tire, are disadvantageously deteriorated.

Registration No. 10-1231729 (Feb. Registration No. 10-1069319 (September 26, 2011)

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 edge portion 2b of the carcass 2, which is turned up by the carcass ply 2a around the bead core, Wherein a turn-up edge portion (2b) of the carcass (2) comprises a bead portion (1) composed of a first bead core (1a) and a second bead core (1b) The first bead core 1a and the second bead core 1b are horizontally disposed between the two bead cores, and between the bead wire 1c and the turn-up edge of the carcass 2 through the tension increasing and buffering action between the first bead core 1a and the second bead core 1b, And a strip rubber 3 is inserted to prevent damage to the cord steel of the portion 2b.

Here, the strip rubber 3 is formed in the shape of a strip rubber 3a having a right triangular section as shown in Figs. 1 to 2 and Fig. 4, Sectional shape of the strip rubber 3a. In the case of the strip rubber 3a having the right-angled triangular cross-section, the acute angle alpha of one of the hypotenuses is preferably 15 degrees.

The second bead core 1a is integrally mounted on the bead filler 4 and the first bead core 1a and the second bead core 1b are made of beads having different bead inner circumference Core.

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 primary drum 5 is manufactured in the same manner as the known method from the inner liner to the carcass 2, A strip rubber 3a is integrally attached to the end of the edge portion 2b.

The turn-up edge portion 2b of the carcass 2, which is turned up on the first bead core 1a, is produced by plastic deformation so that the joint portions 2c are formed at an angle.

Turn-up bladers 6 and turn-up fingers 7 are positioned as shown in FIG. 2 (B) to turn up the turn-up edge portion 2b of the carcass 2 about the first bead core 1a The first bead core 1a is advanced to the forming primary drum 5 like the first bead setter 8a and the carcass 2 is turned down from the dotted line position to the solid line position, .

Then, the first bead core 1a is positioned in the carcass 2 turned down as shown in Fig. 2 (C), the first bead setter 8a is moved backward together with the turn-up finger 7 to complete the operation, The bead filler 4 having the two bead setter 8b and the first bead core 1b is in a standby state.

2 (D), after the first bead core 1a is seated on the molded primary drum 5 in the carcass 2 that has been turned down, the turn-up bladder 6 expands and the carcass 2 At this time, when the turn-up operation is performed around the first bead core 1a while the plastic joints 2c, which have been plastically deformed beforehand, are aligned with the hexagonal corners of the first bead core 1a, Up state of the turn-up edge portion 2b of the carcass 2 in the first bead core 1a is completed.

2 (E), the pressing operation of the press roll 10 is carried out for complete attachment of the turn-up edge portion 2b of the carcass 2 and the strip rubber 3a to the bead core 1a.

2 (F), the bead filler 4 equipped with the second bead core 1b advances to the molded primary drum 5 by the second bead setter 8b and is moved to the solid line position Up-edge portion 2b of the carcass 2 turned up around the first bead core 1a.

The turn-up edge portion 2b of the carcass 2 turned up with the strip rubber 3a between the first bead core 1a and the second bead core 1b as shown in Fig. 2 (G) The turn-up bladder 6 turns on the wrapped bead filler 4, and the adhesion of the remaining semi-finished products acts in the same manner as the conventional molding method, thereby forming a heavy-duty tire.

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 bead portion 1 by turning up the periphery of the bead core by the turn-up edge portion 2b of the carcass 2, The method comprising: a first step of integrally attaching a strip rubber (3) to a 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- Step.

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 strip rubber 3 is integrally attached to the end of the turn-up edge portion 2b of the carcass 2, the cross-section of the strip rubber has a right triangle or a straight shape have.

The turn-up edge portion 2b of the carcass 2 disposed between the first bead core 1a and the second bead core 1b has a structure that is fitted in the horizontal direction.

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)

delete delete delete delete A method for manufacturing a bead structure for a heavy duty tire in which the periphery of a bead core is turned up by a turning-up edge portion (2b) of a carcass (2) to manufacture a bead portion (1)
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: 6. The method of claim 5,
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. 6. The method of claim 5,
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.

KR1020150109297A 2015-08-03 2015-08-03 Bead structure manufacturing method of heavy duty tires KR101666808B1 (en)

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
KR1020150109297A KR101666808B1 (en) 2015-08-03 2015-08-03 Bead structure manufacturing method of heavy duty tires

Country Status (1)

Country Link
KR (1) KR101666808B1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Patent Citations (4)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Similar Documents

Publication Publication Date Title
US7819157B2 (en) Tire bead structure
KR101666808B1 (en) Bead structure manufacturing method of heavy duty tires
US20100263780A1 (en) Pneumatic tire manufacturing method and pneumatic tire
KR20110015536A (en) Process and apparatus for building tyres
JP6475485B2 (en) Pneumatic tire and manufacturing method thereof
JP2007015330A (en) Method of manufacturing pneumatic tire, and pneumatic tire
JP4488792B2 (en) Pneumatic tire manufacturing method
JP6186245B2 (en) Green tire molding apparatus and pneumatic tire manufacturing method
JP2013078966A (en) Tire and vulcanizing mold for the tire
JP4788252B2 (en) Manufacturing method of rigid core for tire vulcanization molding and pneumatic tire
US9290062B2 (en) Tyre and tyre building method
JP2012131168A (en) Method for manufacturing cross-ply tire
JP5798319B2 (en) Method for forming cylindrical green tire
JP6484107B2 (en) Raw tire forming method
JP5216832B2 (en) Vulcanized tread
JP2019077079A (en) Green tire manufacturing method
JP3329568B2 (en) Manufacturing method of super flat pneumatic radial tire
CN104903085A (en) Process and apparatus for producing tyres for vehicle wheels
JP6147650B2 (en) Pneumatic tire manufacturing method
JP2007301830A (en) Method for producing pneumatic radial tire for heavy load and pneumatic radial tire for heavy load
JP2018114646A (en) Tire molding apparatus
JP3329571B2 (en) Molding method of flat pneumatic radial tire
JPH10138708A (en) Pneumatic radial tire
WO2007102441A1 (en) Method of manufacturing pneumatic tire, and pneumatic tire
JPH07266452A (en) Production of ultra-flat pneumatic radial tire

Legal Events

Date Code Title Description
GRNT Written decision to grant
FPAY Annual fee payment

Payment date: 20181206

Year of fee payment: 6