JP2930211B2 - Wheel manufacturing method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for manufacturing a wheel in which a tire is integrally formed on the outer periphery of a rim.

(Prior art and its problems) Conventionally, a method of manufacturing a wheel in which a tire is integrally formed around a rim as disclosed in JP-A-63-260408 has been disclosed. Since the rubber is vulcanized from the outside, the vulcanization time is long and the production efficiency is poor, and in some cases, the tire outer surface may be deteriorated due to long-term contact with the high-temperature mold. Was.

(Method for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides a method for solving the above-mentioned problems by using molds 11 and 12 heated to a temperature at which raw rubber is vulcanized.
In order to integrally mold the tire on the outer periphery of the tire, the rubber is vulcanized from the outside and the inside of the tire by putting a gas heated to a temperature at which the raw rubber is vulcanized into the hollow portion 108 provided inside the tire. This is a method for manufacturing wheels.

(Function and Effect of the Invention) The present invention relates to a mold 11 heated to a temperature at which raw rubber is vulcanized.
・ Since the rubber is vulcanized from the outside and the inside of the tire with the gas heated to the temperature that vulcanizes the raw rubber placed in the hollow part inside the tire, the molding vulcanization time of the tire is shortened, The production efficiency is good, and a good tire rubber structure is obtained, and the performance as a wheel is good.

(Example) A method of manufacturing a wheel according to an example of the present invention will be described in detail with reference to the drawings.

First, a hydraulic press forming apparatus 1 for press forming wheels
Will be described. Reference numeral 2 denotes a machine frame constituted by fixing columnar frames 5 at four corners of a pedestal 3 provided on a floor surface and an upper frame. Reference numeral 6 denotes a vertical moving frame having through holes 7 at four corners, and the columnar frames 5 are mounted so as to pass through the through holes 7. Numeral 8 denotes a hydraulic device for moving the vertical moving frame 6 up and down along the cylindrical frames 5. The upper portion of the hydraulic piston 9 is fixed to the lower surface of the vertical moving frame 6. Reference numerals 10 and 10 denote left and right rails fixedly provided on the upper surface of the vertical moving frame 6, and are mounted thereon so that the lower die 11 for wheel forming can move in the ero direction. Reference numeral 12 denotes an upper die for molding wheels, which is fixed to the lower surface of the upper frame 4 with bolts.

13a and 13b are flexible pipes that supply steam having a temperature of 140 to 200 ° C. and a pressure of 12 kg / cm ² into the lower mold 11 and the upper mold 12, and the lower mold 11 and the upper mold 12 are The temperature is maintained at 140-200 ° C, which is a temperature for vulcanizing raw rubber in a short time.

Numeral 14 denotes a temperature control cabinet installed on the floor below the left and right rails 10, 10, in which an electric heater 15 and a cooling device 16 are provided. Reference numerals 17 and 17 denote left and right rails provided between the inside and outside of the temperature control chamber 14, and a grip 18
Is mounted so that it can move along the rails. Then, while the operator places the core mold 20 on the upper surface of the moving table 19, the moving table 19 is moved along the left and right rails 17 The core mold 20 can be stored together with the moving table 19 in the temperature control chamber 14. Reference numeral 22 denotes a lid (door) that opens and closes the entrance of the temperature control cabinet 14 by being inserted and removed in the vertical direction. However, the temperature control cabinet 14 houses the core mold 20 therein, and by the action of the electric heater 15 and the cooling device 16, the temperature can be raised to a temperature of 70 ° C. to 110 ° C. at which raw rubber can be molded and not vulcanized in a short time. Subtype 20
Is configured to regulate the temperature.

Reference numeral 23 denotes a nozzle mounted at the tip of a bendable pipe 24, which has a temperature of 140 to 200 ° C. and a pressure of 12 kg / c from the tip.
It is configured so that m ² water vapor can be ejected. Note that a bubble 24 'is provided at the base of the pipe 24, and the nozzle 23
It is configured to be able to switch between a state in which water vapor is ejected from the tip of the pipe and a state in which the water vapor is shut off and the inside of the pipe 24 is opened to the atmosphere.

 Here, the lower mold 11 will be described in detail.

The lower mold 11 is configured by fixing a base 11a and a mold 11b with bolts 11c.

Reference numeral 25 denotes a mold engraved on the upper surface of the mold portion 11b, a portion 26 for forming a wheel 100 tire body 101 described later, a portion 27 for forming a lug 102, a portion 28 for forming a spoke covering portion 103, and the like. The outer shape of the rubber tire is carved, and the surface is formed as a rough surface.

Reference numeral 29 denotes a support pin that penetrates a hole 105 of a boss 104 of the wheel 100 described later, and is fixed to the center of the upper surface of the base 11a. Reference numeral 30 denotes a spoke supporting portion for supporting a spoke 106 of the wheel 100 described later, and is provided at three places on the upper surface of the mold portion 11b. However, the support pins 29 and the three spoke supports 30 ...
In this configuration, the rim 107 of the wheel 100 can be positioned at a predetermined position of the mold portion 25. Note that a movable support 30a that can move up and down is provided at the center of the spoke support 30 and is urged in the upward direction by a spring 30b.

31 are through holes formed at the bottom of the portion 27 of the mold portion 11b where the lug 102 is formed. Reference numeral 32 denotes a through hole formed in the upper surface and the side surface of the base 11a, and a pipe 33 is provided on a side surface portion thereof. Reference numerals 34 and 34 denote seals, which are provided in circular grooves carved on the upper surface of the base 11a with the openings of the through holes 31 ... and 32 interposed therebetween. However, the pipe 33 is connected to a vacuum pump, and a vacuum
When press-molding with raw rubber on, the through-holes 31 are set to a negative pressure so that the rubber spreads to the bottom corner of the portion 27 where the lug 102 is formed.

Reference numeral 35 denotes a hole provided in the outer peripheral portion of the mold 25, and is provided so that the rubber spreads to the outer peripheral corner of the mold when raw rubber is placed on the mold 25 and press-molded.

50 ... are thin pins provided on the bottom of the mold 25,
When raw rubber is placed on 25, the raw rubber is inserted to prevent the raw rubber from shifting.

Reference numeral 36 denotes a hole provided inside the base 11a, and a bendable pipe 13a for supplying steam having a temperature of 140 to 200 ° C. and a pressure of 12 kg / cm ² is connected to the hole inlet 36a. ,
The water vapor is introduced into the hole 36 and discharged from the hole outlet 36b through a bendable pipe 13a '. The temperature of the lower mold 11 is maintained at 140 to 200 ° C. for vulcanizing raw rubber.

37a are holes provided at the four corners of the lower die 11, and are provided so that the positioning fitting pins 38 provided on the upper die 12 described later are fitted therein. 37b are through holes provided in the lower mold 11, and are provided so that positioning fitting pins 43 provided in the core mold 20, which will be described later, are fitted therein.

39 has a temperature of 140 to 200 ° C. and a pressure of 12 kg / cm ²
A vertical groove 39a into which a nozzle 23a of the nozzle 23 is inserted, a lateral groove 39b into which a flange 23b of the nozzle 23 is inserted, and an ejection pipe 23 of the nozzle 23 are provided on the upper surface thereof.
A vertical groove 39c into which c is inserted is provided. Numeral 40 is a groove for fitting the nozzle 23 provided on the upper surface of the mold portion 11b with the ejection pipe 23c.

 Next, the upper mold 12 will be described in detail.

The upper mold 12 is configured by fixing a base 12a and a mold 12b with bolts 12c.

Reference numeral 25 'denotes a mold engraved on the lower surface of the mold part 12b, and a part 26' for forming a tire body 101 of the wheel 100 described later and a lug.
A portion 27 'for forming 102, a portion 28' for forming the spoke covering portion 103, and the like are carved, and the surface thereof is formed as a rough surface.

Reference numeral 41 denotes a hole into which the tip of the support pin 29 is fitted.
It is provided at the center of the lower surface of 12a.

31 'are through holes formed in the bottom of the portion 27' for molding the lug 102 into the mold portion 12b. Reference numeral 32 'is a through hole formed in the upper surface and the side surface of the base 12a, and a pipe 33' is provided in a side surface portion thereof. Numerals 34 'and 34' are seals, and a base is formed between the through holes 31 'and 32'.
It is provided in a circular groove carved on the lower surface of 12a. However,
The pipe 33 'is connected to a vacuum pump, and the seals 34' and 34 '
The space is evacuated, and when the raw rubber is put into the mold 25 'and press-formed, the through-holes 31' are set to a negative pressure so that the rubber spreads to the bottom corner of the portion 27 'where the lug 102 is formed.

A hole provided in the outer peripheral portion of the 35 'mold 41, which is provided so that the rubber extends to the outer peripheral corner of the mold when press-molding raw rubber into the mold 25'.

Reference numeral 36 'denotes a hole provided in the base 12a, and a flexible pipe 13b for supplying steam having a temperature of 140 to 200 ° C. and a pressure of 12 kg / cm ² is connected to the hole inlet 36a'. The water vapor is introduced into the hole 36 ', discharged from the hole outlet 36b' through a bendable pipe 13b ', and the temperature of the upper mold 12 is maintained at 140 to 200 ° C for vulcanizing the raw rubber. ing.

38 are fitting pins provided at the four corners of the upper mold 12 and penetrate through through holes 42 provided at the four corners of the core mold 20 described later;
The lower mold 11 is provided so as to fit into the hole 37a.

Reference numeral 39 'denotes a holding table provided opposite to the table 39 on which the nozzle 23 is set. The nozzle 23 is held by the table 39 and the pressing table 39 'at the time of press molding, and the tip of the ejection pipe 23c projects and protrudes into the space formed by the dies 25 and 25'.

Reference numeral 30 'denotes a spoke supporting portion which supports the spoke 106 in cooperation with the spoke supporting portion 30 of the lower mold 11, and is provided at three places on the lower surface of the mold portion 12b. A movable support 30a 'is provided at the center of the spoke support 30' so as to be movable up and down, and is urged downward by a spring 30b '.

Next, the core mold 20 will be described. On the upper surface and the lower surface, a portion 45 for forming a hollow portion 108 of a tire body 101 of a wheel 100 described later, and a lug 102 for the lower mold 11 and the lower mold 12 are formed. Projections 46 that press the rubber into the 27 and 27 'so that the rubber spreads to the bottom corners during press molding.
(The cavity portion 108 'inside the lug 102 formed by being pushed by the protrusion portions 46 is formed in communication with the hollow portion 108.) and the hollow portion 123 into which the rim 107 of the wheel 100 enters. the amount of projection of the portion 47 (portion 47 for molding When L ₁ a, as is also the radius of the cavity 123 becomes L _1, the radius L ₁ of the cavity portion 123 is smaller than the radius L ₂ of the rim 107 Is set.), And a portion 48 for forming a cavity into which the spoke 106 of the wheel 100 enters.
And annular groove portions 60 and 61 for forming joining margins E ₁ and E _{2 in} which the outer peripheral portion and the inner peripheral portion of the two half-shaped tires formed by the lower mold 11 and the upper mold 12 are joined. Types 44 and 44 are carved.
The surfaces of the molds 44 are subjected to a silicon baking treatment (or a fluorine coating treatment), so that the rubber after molding is easily separated.

51 are thin pins provided on the upper surface of the mold 44,
When raw rubber is placed on 44, the raw rubber is inserted to prevent the raw rubber from shifting.

42 ... are through holes through which the fitting pins 38 ... of the upper die 12 pass, 43 ...
Are positioning fitting pins that fit into the through holes 37b provided in the lower mold 11.

Reference numerals 49 and 49 denote left and right suspension portions for hanging wires and the like of the lift device when the core mold 20 is detached from the lower mold 11 and lifted.

Next, the temperature for vulcanizing the raw rubber in a short time is 140 to 200 ° C.
Core mold 20 adjusted to a temperature of 70 to 110 ° C, which can mold lower rubber 11 and upper mold 12 and raw rubber that have been heated to a temperature and does not vulcanize in a short time
A method of forming the wheel 100 using the hydraulic press forming apparatus 1 having the following will be described.

First, an iron tubular boss for attaching the wheel to the wheel
Wheel body 110 in which 104 and an annular rim 107 made of an iron pipe are welded and connected to spokes 106 made of three iron pipes.
Prepare The boss 104 and the spokes 106 are reinforced iron plates
Reinforced connection at 109.

Then, an adhesive A for bonding the rubber and an adhesive B for bonding the iron are applied to the entire wheel body 110, and after drying, the adhesive A for bonding the rubber is applied to a circle of the spoke 106 with the rubber-covered portion. Apply to the annular rim 107. Next, the annular rim 1
07 A solution obtained by dissolving rubber in a solvent is applied to the outer periphery, a strip-shaped natural raw rubber C having good adhesiveness is adhered thereon, and a liquid obtained by dissolving rubber in a solvent is applied thereon.

Next, the lower die 11 is moved from the position facing the upper die 12 to the left and right rails.
Move the upper part of 10.10 in the direction of B and position it at the tip of the right and left rails 10.10. And, in advance, the wheels 10
It is possible to mold the band-shaped raw rubber D cut in accordance with the pitch between the lugs 102 and 102 at a temperature of 70 which does not cure in a short time.
The preheated to ~ 110 ° C is placed on the mold 25 of the lower mold 11. At this time, the band-shaped raw rubber D is locked with the pin 50 so that the cut is located in the middle of the portions 27, 27 on which the lugs 102 are formed, and the raw rubber is positioned exactly on the 27.

Then, the core mold 20 is taken out from the temperature control cabinet 14, and is put on the lower mold 11 such that the fitting pins 43 are fitted into the through holes 37b provided in the lower mold 11.

Then, the band-shaped raw rubber D is also placed on the mold 44 on the upper surface of the core mold 20. At this time, in the same manner as when the belt-shaped raw rubber D is placed on the lower mold 11, the cut is located in the middle of the projections 46, 46 for forming the lugs 102, so that the raw rubber is just positioned on the projections 46. Then, the band-shaped raw rubber D is locked by the pin 51.

Then, the lower mold 11 on which the core mold 20 is overlapped is
Move the upper part of the upper die 12 to the position facing the upper die 12 so that the alignment fitting pins 38 of the upper die 12 pass through the through holes 42 of the core die 20 to the holes 37a of the lower die 11. So that it fits
Hydraulic device 8 until upper mold 12, core mold 20 and lower mold 11 come into close contact
Is operated to move the vertical moving frame 6 upward. The pressing pressure between the dies at that time is about 100 to 120 kg / cm ² and the molding is performed for about 2 minutes. Then, the band-shaped raw rubber D is 25, 25 ', 44, 44 of each type.
Press molded at the tire body 101 of the wheel 100, lug 1
02 ..., spoke cover 103 ..., and cavity into which rim 107 enters
123 is molded. At that time, the lug 102 ... part is a core type
Pressing of the projections 46 formed on 20 and suctioning by a vacuum pump through through holes 31 formed at the bottom of the portions 27... 27 ′ forming the lugs 102 of the lower mold 11 and the upper mold 12. And by the lower mold
The rubber sufficiently spreads to the bottom corners of the lugs 102 of the upper mold 12 and the lugs 102 of the upper mold 12 so that they can be molded neatly. Then, the vertical frame 6 is moved downward by the hydraulic device 8 to separate the upper mold 12 and the core mold 20, and then the lower mold 11 is placed on the left and right rails 10, 10 while the core mold 20 is stacked. To the left and right rails 10 and 10 to the end. Then, the core mold 20 is separated from the lower mold 12 by the lift device, and the core mold 20 is stored in the temperature control cabinet 14 again. At this time, the surfaces of the molds 44, 44 of the core mold 20 are silicon-baked (or fluorine-coated) so that the rubber after molding is easily separated, and the molds of the lower mold 11 and the upper mold 12 Due to the fact that the surface of 25 ・ 25 ′ is treated as a rough surface and rubber is difficult to separate,
The molded half-split tires remain in the lower mold 11 and the upper mold 12, respectively.

In this way, a half-split tire is formed as shown in FIG. 14, and the joining allowances E ₁ and E _{2 of} each half-split tire are determined from the joining surface of the lower mold 11 and the upper mold 12. Protruding (core type 20
Part formed by the annular groove portions 60 and 61). And since the joining margins E ₁ and E ₂ are not yet vulcanized because they are molded in the core mold 20, they are integrally joined when the half-split tires are integrally joined and vulcanized in the next step. That is, the two half-split tires are firmly adhered and formed. The shape of the bonding margins E ₁ is the outer circumferential side of the tire inner side reduce its projecting amount d ₂ of the tire are formed on the projection amount d ₁ is larger inclined.
When joining two half-split tires together,
The outer peripheral side, which affects the outer surface where vulcanization is in contact with the lower mold 11 and the upper mold 12, has a small protrusion amount necessary for adhesion, and a pressing force is applied to the outer surface surface where vulcanization is in progress during joining. In order to prevent wrinkles or streaks from entering the surface so as not to give too much, the uncured inner side that is not in contact with the lower mold 11 and the upper mold 12 has a large protrusion and extra The rubber swells in the hollow part 108 to form a swelled part 111 so that a sufficient adhesive force can be obtained.

Next, the hole 105 of the boss 104 of the wheel body 110 having the belt-shaped raw rubber C adhered to the outer periphery of the annular rim 107 is inserted into the support pin 29 of the lower mold 11 to support the spoke 106 on the spoke support 30. Thus, the rim 107 of the wheel main body 110 is positioned in the hollow portion 123 in which the rim 107 of the half-shaped tire of the lower mold 11 enters.

Then, the lower mold 11 is moved again on the left and right rails 10 and 10 in the direction A so as to face the upper mold 12, and the tip of the ejection pipe 23c of the nozzle 23 is located in the hollow portion 108 of the half-shaped tire. The nozzle 23 is set on the base 39 of the lower die 11 so that the alignment pin 38 of the upper die 12 fits into the hole 37a of the lower die 11, so that the upper die 12 and the lower die 11 are in close contact with each other. The vertical movement frame 6 is moved upward by operating the hydraulic device 8 until the operation is completed. Both types at that time11
Pressing pressure between 12 may be greater than the pressure 12 kg / cm ² of steam to be ejected from the tip of the nozzle 23, but in the present embodiment is set to about 100~120kg / cm ^2.

Then, by operating a bubble 24 ′ of the pipe 24, steam having a temperature of 140 to 200 ° C. and a pressure of 12 kg / cm ² is ejected from the tip of the nozzle 23.

Then, the tire heats the lower mold 11 and the upper mold 12 (temperature 140-200).
C) from the outer surface, and vulcanized from the inside with steam of 140-200 ° C ejected from the nozzle 23.
The entire tire is vulcanized in ~ 10 minutes.

At this time, the radius L ₁ of the cavity 123 of the tire that enters the rim 107
Than is formed smaller than the radius L ₂ of the rim 107, the rubber is pressed by the rim 107 at the time of pressing, the adhesion between the rim 107 and the tire is carried out accurately. Also, a part of the excess rubber pressed by the rim 107 swells toward the hollow part 108 side,
Because it comes into close contact with the band-shaped raw rubber C that is adhered to the rim 107,
Even if high-pressure steam is put in the hollow portion 108, the steam is prevented from entering between the rubber and the rim 107. Therefore, the adhesion between the rim 107 and the tire becomes very strong.

In addition, the air that has entered the rubber inside the tire (air enters the rubber when rolling the rubber) and the gas generated inside the rubber due to heat expands at the temperature applied during vulcanization. Since the water vapor contained in the hollow portion 108 is suppressed by the high pressure, a stable and uniform rubber structure can be obtained and a good-quality tire can be formed. Then, by the high pressure of the water vapor contained in the hollow portion 108, the rubber bulged in the hollow portion 108 by being pressed by the rim 107 or the band-shaped raw rubber C bonded to the rim 107 is pressed against the rim 107, 107 is more firmly bonded to the tire.

In this way, after steam of 140 to 200 ° C. is jetted from the nozzle 23 and vulcanization is performed for 5 to 10 minutes, the jet of steam is stopped by operating the valve 24 ′, and the steam in the hollow portion 108 is released to the atmosphere. The inside of the hollow portion 108 is kept at the atmospheric pressure for about 1 minute in a state where it starts inside, and then the upper and lower molds 12 and 11 are separated by moving the vertical moving frame 6 downward by the hydraulic device 8 to separate the nozzle. twenty three
After removing the lower mold 11, the lower mold 11 is moved on the left and right rails 10 and 10 in the direction B, pulled out to the tip of the left and right rails 10 and 10, and the wheel 100 is taken out from the lower mold 11.

Then, the hole 112 formed in the outer peripheral portion of the tire by the ejection pipe 23C of the nozzle 23 is closed by press-fitting a cylindrical rubber 113 having a diameter larger than the diameter of the hole 112, and the lower mold 11 and the upper mold 12 are closed. A cylindrical rubber portion protruding laterally from the lug 102 formed when excess rubber is fitted into the through holes 31... 31 ′ formed in the bottoms of the portions 27. 114… is cut and removed from the fundamental. In addition, lower mold 11 and upper mold 12
The cylindrical rubber portions 115 protruding laterally from the lugs 102 formed by fitting excess rubber into the holes 35 provided in the holes at the time of molding.
May be left as it is because its projection amount is small, but if it adversely affects the performance as a wheel, it is cut off from its root.

In this way, the wheels as shown in FIGS.
100 is made, but since the hollow portion 108 is formed inside the tire body 101, when mounted on a running vehicle body, the cushion is good and the running performance is good. Also, even if a small hole is made by a nail or the like pierced into the tire body 101, there is no problem because the inside of the hollow portion 108 is originally at atmospheric pressure, and it does not become impossible to run like a conventional high pressure pneumatic wheel. ,
You can continue running. This is because the shape of the tire body 101 and the lug 102 of the wheel 100 manufactured as described above is such that even if there is a hollow portion 108 inside, the solid tire substantially supports the traveling vehicle body. is there. More specifically, the thickness t of the part (lower part of the hollow part) 102 of the tire body 101 to be bonded to the rim 107 is the same as the thickness t of the hollow part 108.
Is formed thicker than the thickness t ′ of the upper portion 121 of
The upper portion 121 of the thin hollow portion 108 is deformed by the reaction force of the load of the traveling vehicle body received from the road surface to exhibit good cushioning properties of the wheel 100. It is blocked at a portion (lower portion of the hollow portion) 120 of the body portion 101 that is bonded to the rim 107. Therefore, the tire of the wheel 100 can support the traveling vehicle body substantially in the same manner as the solid tire, despite the fact that the hollow portion 108 is provided inside, while discarding good cushioning properties.

Finally, the boss 104, the spokes 106, and the reinforcing iron plate 109 of the vehicle body 100 are colored with black paint of the same color as rubber, and one side of the annular groove 122 formed on the side surface of the tire (the traveling vehicle body). Applying a paint such as yellow or white only to the outer side surface when mounting on the vehicle increases the commercial value and the direction of rotation of the wheel 100 is specified by the shape of the lug 102 (agricultural machinery Most of the lug-equipped wheels have a fixed rotation direction when mounted on the vehicle body.) When the vehicle is mounted on the vehicle body, only the outer side is coated with a paint that is prominent in a ring shape. It is possible to prevent the mounting direction from being mistaken.

Note that, in the above embodiment, the hollow portion 108
Although steam was used as the gas to be charged into the gas, any gas may be used as long as it is heated to a temperature at which rubber can be vulcanized.

[Brief description of the drawings]

Figure shows one embodiment of the present invention, a side view of FIG. 1 is a hydraulic press forming apparatus, FIG. 2 is a plan view of the lower mold 11, FIG. 3 is a second view S ₁ - S ₁ sectional view, FIG. 4 is a view of FIG.
S ₂ -S ₂ sectional view, Fig. 5 F arrow view of FIG. 2, FIG. 6 is a bottom view of the upper mold 12, FIG. 7 is S ₃ -S ₃ cross-sectional view of FIG. 6, 8 figure S ₄ -S ₄ cross-sectional view of FIG. 6, FIG. 9 is a plan view of the medium-sized 20, the
10 Figure S ₅ -S ₅ cross-sectional view of FIG. 9, FIG. 11 S ₆ of FIG. 9 -S ₆
FIG. 12 is a sectional view taken along the line S ₇ -S _{7 of} FIG. 9, and FIG.
S ₈ -S ₈ cross-sectional view of FIG, Fig. 14 acts explanatory cross-sectional view at the time of molding,
FIG. 15 is a perspective view of the belt-shaped raw rubber D, FIG. 16 is a side view of the wheel main body 110 to which the raw rubber C is adhered, and FIG.
Partially sectional side view of the 00, FIG. 18 is a plan view of FIG. 17, FIG. 19 is a S ₉ -S ₉ sectional view of FIG. 17. In the figure, 1 is a hydraulic press forming apparatus, 11 is a lower mold, 12 is an upper mold, 20 is a core mold, 23 is a nozzle, 100 is a wheel, 101 is a tire body, 102 is a lug 102, 103 is a spoke. A covering portion, 104 is a boss, 106 is a spoke, 107 is a rim, and 108 is a hollow portion.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Satoru Satoru 3-6-1, Matsuhama-cho, Fukuyama-shi, Hiroshima Fukuyama Rubber Industry Co., Ltd. Document JP-A-63-260408 (JP, A) JP-A-1-1131211 (JP, A) JP-A-47-11693 (JP, A) JP-A-49-98482 (JP, A) JP-A-62 127210 (JP, A)

Claims (1)

(57) [Claims] A mold heated to a temperature at which raw rubber is vulcanized.
In order to integrally mold the tire on the outer circumference of the rim 107 with 12,
A method for manufacturing a wheel, comprising: introducing a gas heated to a temperature at which raw rubber is vulcanized into a hollow portion 108 provided inside the tire to vulcanize the rubber from outside and inside the tire.