JP2013095097A - Method for manufacturing tire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a tire capable of easily and precisely disposing a lug member to a tire case by maintaining an interval between lugs arranged along a circumference direction and an inclination angle to the circumference direction constant.SOLUTION: The method includes: separately forming a vulcanized lug member and a vulcanized tire case with a plurality of positioning recesses along the circumference direction respectively; arranging the obtained vulcanized lug member on the peripheral surface of the vulcanized tire case along the plurality of positioning recesses; and vulcanizing it via an adhesion layer.

Description

  The present invention relates to a method for manufacturing a tire, and more particularly to a method for manufacturing a tire capable of maintaining a constant interval between lugs formed along the circumferential direction of the tire and an inclination angle of the lug with respect to the circumferential direction.

Conventionally, as a tire adopted for agricultural vehicles used in wetlands and fragile land, or construction vehicles that frequently travel on rough terrain, from the viewpoint of obtaining high traction, the tread part A lug-equipped tire having a plurality of lugs formed at a predetermined interval along the tire rotation direction (circumferential direction) has become widespread. In manufacturing a tire with a lug, a gold having an unvulcanized green tire having a carcass layer, a tread rubber layer, etc. laminated in a toroidal shape on a pair of bead portions and having a concave portion having a predetermined shape corresponding to the lug. Generally, it is put into a vulcanizing apparatus equipped with a mold and vulcanized and molded.
The green tire put into the vulcanizer is heated in a state where the surface of the tread rubber layer is pressed to the mold side by a pressing means called a bladder, and a plurality of predetermined shapes in which the tread rubber layer is formed on the mold. By flowing into the recesses, a lug-equipped tire having a plurality of lugs protruding at predetermined intervals from each other along the tire rotation direction is formed.

WO 2009/072633 A1

In recent years, research and development have been conducted on a manufacturing method that replaces a conventional manufacturing method in which a green tire with a tread rubber layer laminated therein is put into a vulcanizer to obtain a tire with a lug. The manufacturing method is that a plurality of lug members vulcanized and molded into a predetermined shape in advance are bonded to an outer peripheral surface of a tire case that becomes a main body portion of a vulcanized and molded tire via an unvulcanized rubber for bonding. After arranging them at intervals, they are put into an elastic bag called an envelope. Then, the tire case and the lug member put into the envelope are vulcanized in a pressurized and heated state by being carried into the vulcanizing apparatus, and the tire with the lug integrated with the tire case and the lug member via the cushion rubber To get.
However, in the above manufacturing method, it is necessary to dispose a plurality of lug members at regular intervals on the outer peripheral surface of the tire case, so even a skilled worker can follow the circumferential direction of the tire case. It is difficult to arrange the lug members with high accuracy, and there may be variations in the interval (pitch) between the lug members and the inclination angle with respect to the circumferential direction. Although it is possible to place the lug member on the tire case while calculating the position to place the lug member, it is necessary to determine the position of the lug member for each tire, which is a very complicated operation. Is concerned.

  The present invention has been made in order to solve the above-described problems, and the interval between the lugs arranged along the circumferential direction and the inclination angle with respect to the circumferential direction are made constant, and the lug member is attached to the tire case. Provided is a tire manufacturing method that can be easily and accurately arranged.

As a form for solving the above-mentioned problems, a vulcanized lug member obtained by individually forming a vulcanized lug member and a vulcanized tire case having a plurality of positioning recesses along the circumferential direction, respectively. Were arranged on the outer peripheral surface of the vulcanized tire case along a plurality of positioning recesses, and vulcanized via an adhesive layer.
According to this embodiment, it is only necessary to arrange the vulcanized lug members along the plurality of positioning recesses of the vulcanized tire case formed separately from the lug members, and the lug members are spaced between the positioning recesses, It can arrange | position accurately according to the inclination-angle with respect to the circumferential direction.
Further, when forming the positioning recess, if the shape of the positioning recess matches the shape of the non-tread surface side of the lug member, the lug member can be easily and accurately fitted into the positioning recess. Become.
The summary of the invention does not enumerate all necessary features of the present invention, and sub-combinations of these feature groups can also be the invention.

It is a perspective view which shows a tire with a lug and a lug member. It is sectional drawing which shows a vulcanizer. It is a perspective view which shows the tire case which has a recessed part. It is width direction sectional drawing when a tire case and a lug member are integrated. It is a perspective view when a tire case and a lug member are accommodated in an envelope.

  Hereinafter, the present invention will be described in detail through embodiments, but the following embodiments do not limit the invention according to the claims, and all combinations of features described in the embodiments are included. It is not necessarily essential for the solution of the invention.

FIG. 1 is an enlarged perspective view of a lug 10 and a lug 15 included in the lug 10.
In FIG. 1, a lug-equipped tire 10 is roughly formed of a plurality of tire body portions 11 that form the foundation of the tire and a plurality of outer circumferential surfaces 11A of the tire body portions 11 that are spaced apart from each other by a predetermined distance along the circumferential direction. And a lug 15.
The lug-equipped tire 10 in the present embodiment has a plurality of positioning recesses 22 on the outer peripheral surface 21A, and a vulcanized tire case 21 ′ corresponding to the tire body 11 and a positioning recess 22 of the tire case 21 ′. It is formed by integrating a vulcanized lug member 25 corresponding to the lug 15 with an unvulcanized cushion rubber 30 as an adhesive layer.

As shown in FIG. 2, the unvulcanized tire case 21 is folded around the pair of bead cores 12 and 12, extends between the bead cores 12 and 12 in a toroidal shape, and includes a side portion Ts and a tread portion Tt. The carcass ply 13 to be formed, the belt 14 laminated on the carcass ply 13 in the tread portion Tt, and the outermost rubber 16 positioned on the outermost side in the radial direction are provided. The carcass ply 13 and the belt 14 are formed by embedding an organic fiber or a steel cord in an unvulcanized rubber sheet, and the material and the number of sheets can be appropriately selected according to the type and application of the tire to be manufactured. It is.
For convenience of explanation, the tread portion Tt and the side portion Ts are defined. However, the range of the tread portion Tt and the side portion Ts varies depending on the use, type, size, and the like of the tire, and is set in a further subdivided region. It is also possible to do.

As shown in FIGS. 1 and 4, the lug member 25 is a member having a substantially trapezoidal cross section along the width direction of the vulcanized tire case 21 ′, and the outer peripheral surface of the tire main body 11. 11A is disposed in a state of protruding outward in the radial direction from the positioning recess 22 formed on the outer peripheral surface 21A of the tire case 21 'corresponding to 11A. Further, the non-treading surface 26 that faces the positioning recess 22 formed in the tire case 21 ′ in the lug member 25 is formed as a curved surface that gently curves in accordance with the surface shape of the tire case 21 ′. The lug sticking surface 23 is in close contact with the cushion rubber 30. The positioning recess 22, the lug attaching surface 23, and the cushion rubber 30 will be described later.
In addition, the tread surface 27 of the lug member 25 is a surface that contacts the road surface, and in the state integrated with the tire case 21 ', from the vicinity of the center (width direction center) of the tire case 21' to the shoulder (both ends in the width direction). It forms as a surface which inclines in the radial direction gradually toward the side.

In addition, the lug member 25 has a protrusion 28 that protrudes from the side surface on the center side of the tire case 21 ′ to the shoulder side. The protrusion 28 is formed by a lower surface 28A that extends radially outward from the center side end of the non-tread surface 26 and an upper surface 28B that extends in the width direction from the side surface on the center side.
The lower surface 28 </ b> A is formed as a curved surface corresponding to the shape of the circumferential end surface 22 </ b> B (see FIG. 3) of the positioning recess 22. The upper surface 28B is a surface corresponding to the shape of the outer peripheral surface 21A of the tire case 21 ', and becomes the same height as the outer peripheral surface 21A of the tire case 21' when the lug member 25 is disposed in the positioning recess 22. Formed as follows. As a result, the joint between the tire case 21 ′ and the lug member 25 is in a flush state, and the lug member 25 can be smoothly arranged with respect to the positioning recess 22 and the appearance of the joint can be improved. In addition, the whole shape of the lug member 25 is not restricted to the said example, According to the kind and application of the tire used as manufacture object, it can change suitably.

FIG. 2 is a cross-sectional view of the vulcanizer 40. Hereinafter, a vulcanizing device 40 capable of forming a tire case 21 ′ having a positioning recess 22 by vulcanizing and molding an unvulcanized tire case 21 will be described with reference to FIG.
The vulcanizing device 40 in FIG. 1 is schematically shown as a lower platen 41, a lower mold 42, a lower bead ring 43, an upper mold 44, an upper platen 45, an upper bead ring 46, a bladder 47, a tread mold 48, and a tread segment 49. , An outer ring 50, a stationary platen 51, and an elevating mechanism 52.

  The lower platen 41 is an annular plate body, and has a flow path 41A through which a heating medium such as high-temperature and high-pressure steam or liquid is supplied from a heat source supply device (not shown). The channel 41A is an annular channel formed at a position corresponding to the lower side portion Ts of the tire case 21. The lower platen 41 functions as a heat source that heats the lower side portion Ts mainly through the lower mold 42 positioned above.

  A lower mold 42 is disposed on the upper surface side of the lower platen 41. The lower mold 42 is an annular metal body made of, for example, aluminum, and transmits heat from the lower platen 41 as a heat source located below to the tire case 21. An inner peripheral surface of the lower mold 42 facing the lower side portion Ts of the tire case 21 is formed as a die-attached surface 42A. The die-attached surface 42A is a surface that is curved so as to surround the lower side portion Ts of the tire case 21.

  A detachable lower bead ring 43 is attached to the upper side of the lower mold 42. The lower bead ring 43 is an annular body that mainly molds the periphery of the bead core 12 in the tire case 21 and holds a later-described bladder 47 through a grip portion.

  The upper mold 44 is an annular metal body that forms a pair with the lower mold 42, and transfers heat from the upper platen 45 as a heat source located above to the tire case 21. An inner peripheral surface of the upper mold 44 facing the upper side portion Ts of the tire case 21 is formed as a die-attached surface 44A. The die-attached surface 44A is a curved surface so as to surround the upper side portion Ts of the tire case 21.

  An upper platen 45 is disposed on the upper side of the upper mold 44. The upper platen 45 is arranged in parallel so as to form a pair with the lower platen 41, and can be moved up and down by an elevating mechanism 52, and can be moved up and down with respect to the lower platen 41. Similarly to the lower platen 41, the upper platen 45 is an annular plate, and has a flow path 45A through which a high-temperature and high-pressure vulcanization medium is supplied from a heat source supply device (not shown) during vulcanization. The flow path 45 </ b> A is an annular flow path formed at a position corresponding to the upper side portion Ts of the tire case 21. The upper platen 45 functions as a heat source that heats the upper side portion Ts mainly through the upper mold 44 positioned below.

  A detachable upper bead ring 46 is attached to the lower side of the upper mold 44. The upper bead ring 46 is paired with the lower bead ring 43, and is an annular body that holds the mold around the bead core 12 and the bladder 47.

The bladder 47 held by the lower bead ring 43 and the upper bead ring 46 is an elastic bag-like rubber body, and is disposed so as to be in close contact with the inner peripheral surface of the tire case 21.
A high-temperature and high-pressure heating medium is supplied to the bladder 47 from a heat source supply device (not shown) during vulcanization. When the heating medium is supplied, the bladder 47 expands outside while closely contacting the inner peripheral surface of the tire case 21 inside the tire case 21. As a result, the tire case 21 disposed in the vulcanization space formed by the lower mold 42, the lower bead ring 43, the upper mold 44, the upper bead ring 46 and the tread mold 48 described later is With the expansion of 47, the lower mold 42, the lower bead ring 43, the upper mold 44, the upper bead ring 46 and the tread mold 48 are heated and vulcanized.

The tread mold 48 is an annular metal body that is located radially outside the lower mold 42 and the upper mold 44, and is individually held with respect to a tread segment 49, which will be described later, divided radially. It is a type. The tread mold 48 transmits heat generated from the flow path 50 </ b> A of the outer ring 50 to the tread portion Tt side of the tire case 21.
On the inner peripheral surface of each tread mold 48, a die-attached surface 48 </ b> A that faces the outer peripheral surface 21 </ b> A of the tire case 21, and a die-attached surface 48 </ b> B that faces the positioning recess 22 formed in the outer peripheral surface 21 </ b> A of the tire case 21. Is formed.

The die-attached surface 48A is a surface extending from the end in the width direction of the tread portion Tt to the center position in the width direction. The die-attached surface 48A is formed as a curved surface so as to surround the outer peripheral surface 21A of the tire case 21, and forms the outer peripheral surface 21A (the outer peripheral surface 11A of the tire main body 11) of the tire case 21 'after vulcanization is completed. It is a surface to do.
The die-attached surface 48B is a surface protruding radially inward from the die-attached surface 48A facing the outer peripheral surface 21A of the tire case 21. The mold surface 48B is a surface for molding the positioning recess 22 of the tire case 21 'after vulcanization, and matches the shape of the lug member 25 described later on the non-treading surface 26 side. Further, the die-attached surface 48B is formed as a curved surface so as to surround the positioning recess 22 of the tire case 21 as with the die-attached surface 48A.

  A plurality of tread segments 49 corresponding to the respective tread dies 48 are arranged on the outer side in the radial direction from the plurality of tread dies 48. The tread segment 49 is a fixing member for the tread mold 48 that is radially divided along the circumferential direction. The tread segment 49 is located between the tread mold 48 and an outer ring 50 described later, and can be moved in the radial direction on the lower platen 41 by rolling means (not shown). The outer peripheral surface of the tread segment 49 is formed as an inclined surface 49A that is gradually inclined inward in the radial direction from below to above. The inclined surface 49A is formed as a tapered surface that faces the inclined surface 50B of the outer ring 50 in a state where the outer ring 50 that moves up and down by an elevating mechanism 52 described later is lowered.

  The outer ring 50 is an annular body having a lower opening that extends perpendicularly to the stationary platen 51 fixed to the elevating mechanism 52 so as to surround the upper mold 44 and the upper platen 45 from the outside in the radial direction. Similar to the lower platen 41 and the upper platen 45, the outer ring 50 has a flow path 50A through which a high-temperature and high-pressure vulcanization medium is supplied from a heat source supply device (not shown) during vulcanization. The channel 50 </ b> A is an annular channel formed at a position corresponding to the tread portion Tt of the tire case 21. The flow path 50A mainly functions as a heat source for heating the tread portion Tt via the tread mold 48 located on the radially inner side.

Further, the inclined surface 50B facing the inclined surface 49A of the tread segment 49 in the outer ring 50 is formed as an inversely tapered surface that gradually inclines radially outward from above.
That is, the inclined surface 49 </ b> A and the inclined surface 50 </ b> B are inclined surfaces having the same gradient, and the elevating mechanism 52 starts to descend along with the vulcanization start operation, and the outer surface is integrally attached via the fixed platen 51. When the inclined surface 50B of the ring 50 is in sliding contact with the inclined surface 49A of the tread segment 49, the plurality of tread segments 49 are radially reduced in diameter, and the tread mold 48 surrounds the outer peripheral surface 21A of the tire case 21. It becomes. On the other hand, when the vulcanization is completed and the elevating mechanism 52 starts to rise, the plurality of tread segments 49 are expanded radially outward, and the tire case 21 ′ is released from the tread mold 48 to complete the vulcanization. The rear tire case 21 'can be removed.

  The elevating mechanism 52 is a cylinder that is located in the center of the vulcanizing apparatus 1 in the radial direction and has a piston inside. The elevating mechanism 52 extends through the fixed platen 51 to the upper platen 45. A movable plate 53 is connected to the lower end of the lifting mechanism 52. The movable plate 53 is a plate that extends in the same direction as the fixed platen 51, and is attached to the lower end of the lifting mechanism 52. Both end portions of the movable plate 53 are connected to the annular upper platen 45. As a result, the upper mold 44, the upper platen 45, and the outer ring 50 connected to the fixed platen 51 are integrally moved up and down by the lifting and lowering operation of the lifting mechanism 52, and the lower platen 41 and the lower mold 42 positioned below are moved up and down. Can be approached or separated.

As described above, when the plurality of tread segments 49 are reduced in diameter as the outer ring 50 is lowered, the tread mold 48 fixed to each tread segment 49 is in a state of surrounding the circumferential direction of the tire case 21. A sealed vulcanization space is formed by the plurality of tread molds 48, the lower mold 42, the lower bead ring 43, the upper mold 44, and the upper bead ring 46.
The unvulcanized tire case 21 accommodated in the vulcanization space is gradually vulcanized by the heat supplied from the lower platen 41, the upper platen 45, and the outer ring 50. Then, a vulcanized tire case 21 ′ having a plurality of positioning recesses 22 along the circumferential direction is formed on the outer peripheral surface 21 </ b> A by the molding surface 48 </ b> B of the tread mold 48.
In the present embodiment, the tread mold 48 is formed with the die-attached surface 48B that protrudes inward in the radial direction. However, the present invention is not limited to this. For example, after forming a new tire case, the positioning recess 22 can also be formed by cutting the outer peripheral surface of the new tire case at a predetermined interval with a cutting device (not shown). Thus, by using the cutting device, it is not necessary to form the die surface 48B on the tread mold 48 of the vulcanizing device 40 described above, and a new tire case is vulcanized using an existing tread mold. Is possible. Moreover, since the positioning recessed part 22 is formed by cutting, the lug sticking surface 23 mentioned later can be formed simultaneously, and it is possible to abbreviate | omit a cutting process.

FIG. 3 is a perspective view showing a vulcanized tire case 21 ′ having a positioning recess 22 and a cushion rubber 30 disposed in the positioning recess 22.
As shown in the figure, the outer peripheral surface 21A of the tire case 21 'removed from the vulcanizer 40 has a plurality of intervals along the circumferential direction and a predetermined inclination angle with respect to the circumferential direction. A positioning recess 22 is formed. The positioning recess 22 is a recess into which a vulcanized lug member 25 described later can be fitted, and is formed by a bottom surface 22A, a circumferential end surface 22B, and a width direction end surface 22C; 22C. The bottom surface 22 </ b> A is a surface facing the non-tread surface 26 of the lug member 25 and has the same gradient as the non-tread surface 26 of the lug member 25. The circumferential end surface 22 </ b> B is a surface that extends radially outward from the bottom surface 22 </ b> A so as to face the shape of the lower surface 28 </ b> A of the protrusion 28 formed on the lug member 25. The width direction end surfaces 22C; 22C are surfaces that extend radially outward from the bottom surface 22A so as to face the shape of the side surface in the width direction of the lug member 25 in a state where the lug member 25 is fitted in the positioning recess 22. is there.
That is, the positioning recess 22 matches the non-treading surface 26 side of the lug member 25 in a state where the lug member 25 is fitted in the positioning recess 22.

  Hereinafter, a method for manufacturing the tire with lugs 10 from the vulcanized tire case 21 'and the vulcanized lug member 25 will be described with reference to FIG. The lug-equipped tire 10 is manufactured through a cutting process, a lug member attaching process, and a vulcanizing process described below.

First, in the cutting process, the lug attaching surface 23 is formed by cutting the positioning recess 22 of the tire case 21 ′ with a cutting device (not shown). The lug application surface 23 is a surface on which the lug member 25 can be applied, and is roughened so that an unvulcanized cushion rubber 30 described later can be easily fixed.
In addition, in this embodiment, although it decided to roughen by cutting the inside of the positioning recessed part 22 of tire case 21 ', it is not limited to this. For example, a member having a predetermined surface roughness such as a fiber, a heat-resistant resin, or a metal mesh may be provided on the surface of the die surface 48B of the tread mold 48 in the vulcanizer 40. As a result, the positioning recess 22 can be roughened simultaneously with the vulcanization molding of the tire case 21, and the cutting step can be omitted.

Tire case 21 'in which the lug sticking surface 23 was formed is conveyed to a lug sticking process. In the lug pasting step, an unvulcanized cushion rubber 30 as an adhesive layer is disposed on the lug pasting surface 23 of the tire case 21 '. The cushion rubber 30 is a plate-like rubber member formed in a shape substantially the same as the shape of the positioning recess 22 (on the non-treading surface 26 side of the lug member 25). By disposing the cushion rubber 30 on the lug attaching surface 23, the tire case 21 ′ and a lug member 25 described later are preliminarily integrated by the adhesive force of the cushion rubber 30.
In the present embodiment, the cushion rubber 30 has been described as being disposed on the lug pasting surface 23. However, after the cushion rubber 30 is pasted on the non-treading surface 26 side of the lug member 25, the cushion rubber 30 is pasted. The worn lug member 25 may be disposed on the lug pasting surface 23.

FIG. 4 is an enlarged cross-sectional view of the tire case 21 ′ and the lug member 25 that are preliminarily integrated via the cushion rubber 30.
When the arrangement of the cushion rubber 30 is completed, a plurality of lug members 25 vulcanized and molded in advance by a vulcanizing device (not shown) are pasted on the lug pasting surface 23 via the cushion rubber 30 described above. The lug member 25 is fitted onto the lug application surface 23 at a predetermined interval along the circumferential direction so as to correspond to the positioning recess 22 formed in the tire case 21 ′. The lug member 25 is preliminarily integrated with the tire case 21 ′ by the adhesive force of the cushion rubber 30.

As described above, the positioning recess 22 is formed on the outer peripheral surface 21A of the vulcanized tire case 21 'so as to match the non-treading surface 26 of the lug member 25, so that the positioning recess 22 becomes the outer periphery of the tire case 21'. Since it becomes a mark at the time of fitting the lug member 25 to the surface 21A, the lug member 25 can be easily arranged on the outer peripheral surface 21A of the tire case 21 '.
In addition, since the plurality of positioning recesses 22 are formed with a predetermined interval along the circumferential direction and a predetermined inclination angle with respect to the circumferential direction, the interval between the lug members 25 and the inclination angle with respect to the circumferential direction. Can always be kept constant, and the lug member 25 can be accurately arranged with respect to the outer peripheral surface 21A of the tire case 21 '.
Furthermore, by using the positioning recess 22 formed on the outer peripheral surface 21A of the tire case 21 'as a mark when arranging the lug members 25, the time required for arranging the lug members 25 is shortened, and the productivity is improved. It is possible to reduce human errors such as forgetting to attach the lug member 25.

FIG. 5 is a perspective view when the tire case 21 ′ and the lug member 25 that are preliminarily integrated via the cushion rubber 30 are put into the envelope 31. Hereinafter, the vulcanization process will be described.
The tire case 21 ′ and the lug member 25 that are preliminarily integrated through the lag attaching process are conveyed to the vulcanization process. The vulcanization step is a step in which the tire case 21 'preliminarily integrated by vulcanizing the unvulcanized cushion rubber 30 and the plurality of lug members 25 are firmly coupled and integrated.
In the vulcanization step, first, the tire case 21 ′ and the lug member 25 that are preliminarily integrated via the cushion rubber 30 are put into the envelope 31. The envelope 31 is a bag that can cover the tire case 21 ′ and the lug member 25 from the outer periphery. The envelope 31 presses the non-treading surface 26 of the lug member 25 against the lug attaching surface 23 of the tire case 21 ′ by sucking the internal air in a sealed state and reducing the pressure.

Further, the envelope 31 has a convex portion 32 corresponding to the shape of the tread surface 27 and the side surface of the lug member 25. The convex portions 32 are formed at the same interval and inclination angle as the interval between the lug members 25 arranged along the circumferential direction and the inclination angle with respect to the circumferential direction. As described above, when the tire case 21 ′ and the lug member 25 are introduced into the envelope 31, the tread surface 27 and the side surface of the lug member 25 are fitted into the convex portion 32. That is, the convex part 32 covers the lug member 25 protruding outward in the radial direction from the outer peripheral surface 21 </ b> A without any gap, is in close contact with the surface of the lug member 25, and presses the tread surface 27 from the outer side in the radial direction.
Thereby, even if it is the lug member 25 which protrudes largely radially outward from 21 A of outer peripheral surfaces of tire case 21 ', the convex part 32 of the envelope 31 closely_contact | adheres to the tread surface 27 and side surface of the lug member 25, and radial direction Since the tread 27 of the lug member 25 is pressed from the outside, it is possible to prevent the lug member 25 from being misaligned during vulcanization and the tire case 21 'and the lug member 25 from being poorly bonded.
In addition, in this embodiment, although the convex part 32 was demonstrated as a shape corresponding to the shape of the tread surface 27 and side surface of the lug member 25, it is not limited to the said embodiment. For example, even if the inner surface of the envelope 31 corresponds to the shape of the tread surface 27 of the lug member 25 and has a shape that slightly bulges outward in the radial direction, it is possible to effectively prevent misalignment and poor adhesion.

With reference to FIG. 5, the vulcanization process will be described.
After covering the tire case 21 ′ and the lug member 25 with the envelope 31, a bead ring 36 is fitted into the inner diameter portion of the tire case 21 ′. The bead ring 33 is a member for sealing the tire case 21 ′, the lug member 25, and the envelope 31.

The tire case 21 ′ and the lug member 25 put into the envelope 31 are carried into a vulcanizing device called a vulcanizing can (not shown) and vulcanized in a state where a predetermined pressure and heat are applied. The cushion rubber 30 at the time of vulcanization gradually melts as the temperature inside the vulcanization can rises. Thereby, the lug pasting surface 23 formed in the positioning recess 22 of the tire case 21 ′ and the non-treading surface 26 of the lug member 25 are cross-linked and firmly bonded.
When vulcanization for a predetermined time is completed under a predetermined pressure and temperature, the tire case 21 ′ and the lug member 25 are integrated by a crosslinking reaction of the cushion rubber 30, and can exhibit product performance after a cooling time. The lug-equipped tire 10 as a product tire is completed.

10 tires with lugs, 11 tire body parts, 11A outer peripheral surface, 15 lugs,
21, 21 ′ tire case, 21A outer peripheral surface, 22 positioning recess,
23 lug application surface, 25 lug member, 26 non-tread surface, 27 tread surface, 28 protrusion,
30 cushion rubber, 31 envelope, 32 convex part,
40 Vulcanizer, 48 tread mold, 48B surface with mold.

Claims (2)

Forming a vulcanized lug member;
Separately from the vulcanized lug member, forming a vulcanized tire case having a plurality of positioning recesses along the circumferential direction;
Arranging the vulcanized lug members on the outer peripheral surface of the vulcanized tire case along the plurality of positioning recesses, and vulcanizing via an adhesive layer. 2. The tire manufacturing method according to claim 1, wherein when forming the positioning recess, the positioning recess has a shape that matches a shape on the non-tread surface side of the vulcanized lug member.

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