JPH02238908A - Manufacture of wheel - Google Patents

Abstract

PURPOSE:To stick tire pieces to a rim surely by a method in which the tire pieces are molded by the outer mold heated at the temperature where green rubber is vulcan ized in a short time and the core mold regulated at the temperature where green rubber is not almost vulcanized in short time, and after a rim has been nipped by the surfaces molded with the core mold of the tire pieces, the tire is molded and vulcanized. CONSTITUTION:In the manufacture of a wheel, tire pieces 130 are molded by the outer molds 11, 12 heated at the temperature where green rubber is vulcanized in a short time and the core mold 20 regulated at the temperature where green rubber is not almost vulcanized in a short time. A rim 107 is nipped with the surfaces 123' molded by the core mold 20 of the tire pieces 130, and then the tire pieces 130 are connected and are integrally molded and vulcanized. Since the surface 123' is formed with the core mold 20 regulated at the temperature where green rubber is not vulcan ized in a short time, when the tire pieces 130 are molded integrally with the rim 107, the tire pieces 130 are surely stuck to the rim 107. Since the outer molds 11, 12 are heated at the temperature where green rubber is vulcanized in a short time, the outer surface of the tire has been already vulcanized in the tire piece-molding process, and the vulcanizing time when the tire pieces 130 are integrally molded, is shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) This invention relates to a method of manufacturing a wheel in which a tire is integrally molded onto a rim. (Prior art and its problems) A method of manufacturing a wheel in which a tire is integrally molded around a rim has been disclosed in Japanese Patent Application Laid-open No. 63-260408, but the method of manufacturing a wheel in which a tire is integrally molded around a rim has been disclosed. Since the temperature of the mold is heated to approximately 120°C to 170°C when forming the pieces, the inner surface of the tire that is bonded to the rim is also vulcanized, and the tire pieces are integrally molded onto the rim in the next process. When doing so, it was not possible to properly adhere the tire piece to the rim. Therefore, when wheels manufactured using this conventional method are used, the rim and tire become misaligned, making it impossible to achieve the original driving performance, and in the worst case, the tire part is damaged. Ta. (Method for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides outer molds 11 and 12 that are heated to a temperature that vulcanizes the raw rubber in a short time, and the raw rubber is hardly vulcanized in a short time. The tire pieces 130, 130 are molded with a core mold 20 whose temperature is adjusted, and the surface 1 of the tire pieces 130, 130 molded with the core mold 20 is
23' - Hold the rim 107 between 123' and the tire piece 13
This is a manufacturing method for an axle in which 0.130 and 0.130 are joined and integrally molded and vulcanized. (Operations and Effects of the Invention) The method for manufacturing a wheel according to the present invention includes a tire piece 130.1
Since the surface 123'123' of No. 30 to be adhered to the rim 107 is molded using the core mold 20, which is adjusted to a temperature that hardly vulcanizes the raw rubber in a short period of time, the tire pieces 130, 130 are attached to the rim 107 in the next step. When integrally molding, the tire piece 13
0.130 properly adheres to the rim 107. Ma. In addition, since the outer molds 11 and 12 are heated to a temperature that vulcanizes the raw rubber in a short time, the outer surface of the tire has already been vulcanized in the process of molding the tire pieces 130 and 130, and is not ready for the next step. The vulcanization time when integrally molding the tire pieces 130, 130 is shortened, and it is possible to obtain a wheel with good overall manufacturing efficiency and at low cost. (Example) A method for manufacturing a wheel, which is an example of the present invention, will be explained in detail based on aspects. First, a hydraulic press forming apparatus 1 for press forming wheels will be explained. 2 is a machine frame constructed by fixing cylindrical frames 5 to the four corners of a pedestal 3 provided on the floor and an upper frame 4. Reference numeral 6 denotes a vertically movable frame body having through holes 7 at its four corners, and the cylindrical frame 5 is mounted so as to pass through the through holes 7. 8 is a hydraulic device that moves the vertically movable frame 6 up and down along the cylindrical frame 5 . . . The upper part of the hydraulic piston 9 is fixed to the lower surface of the vertically movable frame 6 . Reference numerals 10 and 10 denote left and right rails fixed to the upper surface of the vertically movable frame 6, on which a lower die 11 for forming the axle is placed so as to be movable in the direction of the earth. 12 is a mold for forming the axle, and is fixed to the lower surface of the upper frame 4 with bolts. 13a and 13b have a temperature of 140 to 200℃ and a pressure of 12
It is a flexible pipe that supplies steam of kg/ci to the inside of the lower mold 11 and the upper mold 12. The temperature of the lower mold 11 and upper mold 12 is 140 to 2, which vulcanizes raw rubber in a short time.
It is kept at 00℃.

Reference numeral 14 denotes an Iill heating cabinet installed on the floor below the left and right rails 10 and 10, and is equipped with an electric heater 15 and a cooling device 16 that operate based on the detection of a temperature sensor. The temperature is always kept between 70℃ and 110℃. Reference numerals 17 and 17 denote left and right rails provided between the inside and outside of the temperature-controlled warehouse 14, and a grip portion 18 is attached to the upper part of the rail.
A movable platform 19 having a . Then, with the core mold 20 placed on the top surface of the movable table 19, the operator moves the movable table 19 along the left and right rails 17 by holding the grip part 18, and moves it to the entrance 20 of the temperature-controlled warehouse 14. Therefore, the core mold 20 can be stored together with the movable table 19 in the temperature-controlled warehouse 14. 22 is a lid (door) that opens and closes the entrance of temperature control [14] by inserting and removing it in the vertical direction. However, the temperature-controlled chamber 14 houses the core mold 20 therein, and by the action of the electric heater 15 and the cooling device 16, the raw rubber is heated to a temperature of 70°C to 110°C at which it can be molded and not vulcanized in a short time. It is configured to adjust the temperature of the child mold 20. 23 is a bendable pipe 2
It is a nozzle attached to the tip of No. 4, and is configured to be able to eject water vapor from the tip at a temperature of 140 to 200°C and a pressure of 12 kg/aJ. A valve 24' is provided at the base of the pipe 24, and is configured to be able to switch between a state in which water vapor is jetted from the tip of the nozzle 23 and a state in which the inside of the pipe 24 is opened to the atmosphere by blocking the water vapor. ing. Here, the lower mold 11 will be explained in detail. The lower mold 11 is
It is constructed by fixing the base part 11a and the mold part 1lb with bolts 11c... Reference numeral 25 denotes a mold carved into the upper surface of the mold part 1lb, which is used to form the tire body 1 of the wheel 100, which will be described later.
Part 26 for molding 01 and part 2 for molding lug 102
The outer shape of the rubber tire is carved, such as the portion 28 for forming the spoke covering portions 103 and 7, and the surface thereof is formed into a rough and rough surface. A support pin 29 passes through a hole 105 of a boss 104 of the wheel 100, which will be described later, and is provided at the center of the upper surface of the base portion 11a. 3
0 are spoke support parts that support spokes 106 of a car @100, which will be described later, and are provided at three locations on the upper surface of the mold part 1lb. However, the rim 107 of the vehicle 100 is attached to the mold part 25 at the support bin 29 and the three spoke support parts 30...
It is configured so that it can be positioned at a predetermined position. still,
A movable support 30a that is vertically movable is provided at the center of the spoke support 30, and is biased upwardly by a spring 30b. 31... is a through hole as a suction part bored in the bottom of the part 27 of the mold part 1lb where the lug 102 is molded. Reference numeral 32 denotes a through hole drilled across the top and side surfaces of the base portion 11a, and a pipe 33 is provided in the side portion thereof. Seals 34 and 34 are provided in circular grooves carved on the upper surface of the base portion 11a, sandwiching the openings of the through holes 3l and 32. Therefore, the pipe 33 is connected to a vacuum pump, and the seal 34 and
34 is placed in a vacuum state, and when raw rubber is placed on the mold 25 and press-molded, the through holes 31... are set to negative pressure, and the lug 102 is placed in a vacuum state.
The rubber is made to spread all the way to the bottom corner of the part 27 where it is to be molded. Reference numeral 35 indicates a hole provided in the outer periphery of the mold 25, and is provided so that when raw rubber is placed on the mold 25 and press-molded, the rubber spreads to the outer periphery corners of the mold. 50... are thin pins provided on the bottom of the mold 25 to prevent the raw rubber from getting stuck and shifting when the raw rubber is placed on the mold 25. 36 is a hole provided inside the base portion 11a, and the temperature is 140 to 200°C.
The pressure is 12kg/a! A bendable pipe 13a for supplying water vapor is connected to the hole port 36a, and the water vapor is introduced into the hole 36 and discharged from the hole outlet 36b through the bendable pipe 13a'tt.
The temperature is maintained between 140 and 200 degrees Celsius, which is the temperature that vulcanizes the raw rubber. 37a... are holes provided at the four corners of the lower mold 11,
A positioning fitting pin 38 provided on the upper mold 12 described later.
It is provided so that ... is fitted into it. 37b... is a through hole provided in the lower mold 11, and is a through hole provided in the core mold 20 described later.
The positioning fitting pins 43 provided in the above are provided so as to fit therein. 39 has a temperature of 14% from the tip.
Pressure is 12kg/11 at 0-200℃! This is a stand on which the nozzle 23 that spouts water vapor of If is set, and its upper surface has a vertical groove 39h into which the cylindrical part 23a of the nozzle 23 is fitted, a horizontal groove 39b into which the flange part 23b of the nozzle 23 is fitted, and a nozzle 23.
A vertical groove 39c into which the ejection pipe 23c is inserted is provided. 40 is a groove in which the ejection pipe 23c of the nozzle 23 provided on the upper surface of the mold part 1lb is fitted. Next, the upper mold 12 will be explained in detail. The upper mold 12 is constructed by fixing a base part 12a and a mold part 12b with bolts 12c... 2
5' is a mold carved into the lower surface of the mold part 12b, and is a part 26 for molding the tire body 101 of the wheel 100, which will be described later.
', a part 27' for forming the lug 102, a part 28' for forming the spoke covering part 103, etc. are carved, and the surface thereof is formed into a rough surface. Reference numeral 41 denotes a hole into which the tip of the support pin 29 is inserted, and is provided at the center of the lower surface of the base portion 12a. 31'...
is a through-hole as a suction part bored in the bottom of the part 27' of the mold part 12b where the lug 102 is molded. Reference numeral 32' denotes a through hole drilled across the top and side surfaces of the base portion 12a, and a pipe 33' is provided in the side portion thereof.
34' and 34' are seals, which are connected to the through hole 31'.
... and 32' in a circular groove carved into the lower surface of the base 12a. However, by connecting the pipe 33' to a vacuum pump, a vacuum is created between the seals 34' and 34'', and when raw rubber is put into the mold 25' and press-molded, the through-holes 31' are set to negative pressure and the lug is removed. The rubber is spread all the way to the bottom corner of the part 27' where mold 102 is to be molded.35' is a hole provided on the outer periphery of mold 41,
It is provided so that when raw rubber is put into 5' and press-molded, the rubber spreads all the way to the outer corners of the mold. 36' is a hole provided inside the platform 12a, and a bendable pipe 13b for supplying water vapor at a temperature of 140 to 200'C and a pressure of 12 kg/cd is connected to the hole entrance 36a'. The water vapor is introduced into the hole 36', and the bendable pipe 13b is introduced from the hole outlet 36b'.
The upper mold 12 is maintained at a temperature of 140 to 200°C to vulcanize the raw rubber. 38 are fitting pins provided at the four corners of the upper mold 12, and through holes 42 and 38 provided at the four corners of the core mold 20, which will be described later.
... and is provided so as to fit into the hole 37a of the lower mold 11. Reference numeral 39' denotes a holding stand provided opposite to the stand 39 on which the nozzle 23 is set. The nozzle 23 is held by a stand 39 and a presser stand 39' during press molding, and the tip of the ejection pipe 23c is positioned to protrude into the space formed by the molds 25 and 25'. Numeral 30' denotes spoke support parts that support the spokes 106 together with the spoke support parts 30 of the lower die 11, and are provided at three locations on the lower surface of the die part 12b. A movable support 30a' that is vertically movable is provided at the center of the spoke support 30', and is biased in the downward direction by a spring 30b'. Next, the core mold 20 will be described. On its upper and lower surfaces, a portion 45 for molding a hollow portion 108 of a tire body 101 of a wheel 100, which will be described later, and lugs 102 of a lower mold 11 and an upper mold 12 are molded. When press-molding the parts 27 and 27', apply the rubber so that it spreads all the way to the bottom corners.
27', the protrusion 46... (the protrusion 46...
Lug 102 formed by being pressed by...Inner cavity 10
8'... are formed in communication with the hollow part 108. ) and the portion 47 that forms the cavity 123 into which the rim 107 of the wheel 100 is inserted (the amount of protrusion of the portion 47 is:
The radius of the hollow portion 123 is , where the radius L1 of the hollow portion 123 is set to be smaller than the radius L2 of the rim 107. ) and the spokes 106 of the wheel 100
The two half-split tire pieces 130 are formed by the lower mold 11 and the upper mold 12.
・Joining allowance E1 and E2 where the outer circumference and inner circumference of 130 are joined
molds 44 and 4 consisting of annular groove portions 60 and 61 for molding
4 is engraved. The surfaces of the molds 44 and 44 are subjected to silicone baking treatment (or fluorine coating treatment).
This allows the rubber to be easily separated after molding. 51... are thin pins provided on the upper surface of the mold 44 to prevent the raw rubber from getting stuck and shifting when the raw rubber is placed on the mold 44. 42... are through holes through which the fitting pins 38... of the upper mold 12 pass, and 43... are fitting pins for alignment that are fitted into the through holes 37b... provided in the lower mold 11. It is. Reference numerals 49 and 49 are left and right suspension parts that reduce the amount of wire used to secure the lift when removing the core mold 20 from the lower mold 11 and lifting it up. Next, the raw rubber is vulcanized at a temperature of 140 to 20°C for a short time.
Using a hydraulic press molding device 1, which has a lower mold 11 and an upper mold 12 heated to 0°C, and a core mold 20 whose temperature is adjusted to 70 to 110°C, which can mold raw rubber and not vulcanize in a short time. , a method for forming the car transport 100 will be explained. First, a steel cylinder-shaped boss 1 is used to attach the wheel to the axle.
04 and an annular rim 107 made of iron pipes are welded together with spokes 106 made of three iron pipes.6 Note that the boss 104 and spokes 106... are reinforced iron plates. Reinforced and connected at 109. Adhesive A for bonding rubber and adhesive B for bonding iron are applied to the entire wheel body 110, and after drying, adhesive A for bonding rubber is applied to the parts of the spokes 106 covered with rubber and the circles. Apply to the annular rim 107. Next, a solution of rubber dissolved in a solvent is applied to the outer periphery of the annular rim 107.
On top of that, glue a bow-shaped piece of natural raw rubber C with good adhesive properties, and then apply a solution of rubber dissolved in a solvent on top of it. Next, move the lower mold 11 from the position facing the upper mold 12 to the left and right rails 1.
Move the top of 0/10 towards the mouth and move the left and right rails 10/10
Place it at the tip of the Then, a band-shaped raw rubber D with cuts made in advance according to the pitch between the lugs 102 and 102 of the car transport 100 is preheated to a temperature of 70 to 110°C that can be molded and will not vulcanize in a short time. , lower mold 1
Place it on mold 25 of 1. At that time, the pin 50 is placed so that the cut is located in the middle of the parts 27, 27 where the lug 102 will be formed, and the raw rubber is positioned exactly on the parts 27.
The raw rubber band D will be sold at the market. Then, the core mold 20 is taken out from the Li warmer 14 and placed on the lower mold 1l so that its 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.
Put on. At that time, in the same way as when the band-shaped raw rubber D was placed on the lower die 11, the protrusion 46 where the cut forms the lug 102 is formed.
・So that the raw rubber is located in the middle of the protrusion 4
6..., and lock the band-shaped raw rubber D with the pin 51. Then, the lower mold 11 with the core mold 20 stacked thereon is moved in the A direction on the left and right rails 10, 10 to a position facing the upper mold 12, and the positioning and fitting bins 38 of the upper mold 12 are The upper mold 1 is passed through the through holes 42 of the core mold 20 and fitted into the holes 37a of the lower mold 11.
Hydraulic device 8 until 2, core mold 20, and lower mold 11 come into close contact with each other.
is activated to move the vertically movable frame 6. At this time, the press pressure between each mold is about 100 to 120 kg/a#, and the molding is carried out for about 2 minutes. Then, the band-shaped raw rubber D has 25 parts for each mold.
・25' ・44 Press-formed at 44 and transported by car 1
00 tire body 101, lugs 102..., spoke covering parts 103..., and cavity 123 into which the rim 107 is inserted.
is formed. At that time, the lug 102... portion is pressed against the protrusion 46... formed on the core mold 20 and the lower mold 1
l and the portion 27 of the upper mold 12 that molds the lug 102...2
The lower mold 11 and the upper mold 12 are removed by suction with a vacuum pump from the through holes 31 bored in the bottom of the
The portions 27...27'... for forming the lugs 102 of
The rubber spreads sufficiently to the bottom corners of the mold and is molded neatly. After the upper die l2 and the core die 20 are separated by moving the vertically movable frame 6 downward using the hydraulic system R8, the lower die 11 is moved onto the left and right rails 10 and 10 with the core die 20 stacked on top of each other. Move it toward the mouth and pull it out to the tips of the left and right rails 10 and 10. Then, the core mold 20 is separated from the lower mold 12 using a lift device, and the core mold 20 is stored in the temperature-controlled warehouse 14 again. At this time, the surfaces of the molds 44, 44 of the core mold 20 are silicone baked (or fluorine coated) so that the rubber after molding can be easily separated, and the lower mold 11.
The surfaces of the molds 25 and 25' of the upper mold 12 are roughened to make it difficult for the rubber to separate, so that the molded half-tire pieces 130 and 130 are attached to the lower mold 11 and the upper mold, respectively. 12 and remains. In this way, half-split tire pieces 130, 130 are molded as shown in No. 14Iiii. The margins E, ·E, protrude (portions formed by the annular groove portions 60 and 61 of the core mold 20). Since the joining allowances E1 and E2 have not been vulcanized yet because they are formed using the core mold 20, in the next process, when the half tire pieces 130 and 130 are joined together and vulcanized. Two half-split tire pieces 13 are integrated into one piece.
0.130 is molded with strong adhesive. Further, the shape of the joint allowance E1 is formed in an inclined shape, with the protrusion amount d2 being small on the outer circumferential side of the tire and the protrusion amount d being large on the inner side of the tire. it is,. Two half tire pieces 13
When joining 0.130 together, the lower mold 11 and the upper mold 12
The outer circumferential side, which is in contact with and affects the vulcanized outer surface, should protrude as little as necessary for gI adhesion, and avoid applying too much pressing force to the vulcanized outer surface during bonding. In addition to preventing wrinkles or streaks from forming on the surface, the unvulcanized inner side that is not in contact with the lower mold 11 and the upper mold 12 is made to protrude a large amount so that excess rubber flows into the hollow part 108 at the time of joining. A raised raised portion 111 is formed to provide sufficient adhesive strength. Next, a wheel body 11 with a band-shaped raw rubber C adhered to the outer periphery of the annular rim 107
The hole 105 of the boss 104 of 0 is inserted into the support pin 29 of the lower mold 11
The spoke 106 is inserted into the spoke support portion 30...
The rim 107 of the wheel body 110 is supported by the lower die 11
The rim 107 of the half-split tire pieces 130 and 130 is positioned in the cavity 123 into which the rim 107 is inserted. Then, the lower mold 11
is again moved in the direction A on the left and right rails 10, 10 to a position facing the upper die 12, and the ejection pipe 23c of the nozzle 23 is
Hollow part 10 of tire piece 130, 130 whose tip is half-split
The nozzle 23 is installed on the base 39 of the lower mold 11 so as to be positioned at 8, and the positioning fitting pins 38 of the upper mold 12 are fitted into the holes 37a of the lower mold 11. The hydraulic device 8 is operated to move the vertically movable frame 6 upward until the lower die 11 and the lower die 11 come into close contact with each other. The press pressure between the dies 11 and 12 at this time should be greater than the pressure of 12 kg/cd of the steam jetted from the tip of the nozzle 23, but in this embodiment it is set to about 100 to 120 kg/d. ．． Then, operate the valve 24' of the pipe 24 to open the nozzle 2.
From the tip of No. 3, the temperature is 140-200℃ and the pressure is 12kg.
/aj steam is spewed out. Then, the tire is lower mold 1
1 and the upper mold 12 (temperature 140 to 200° C.) from the outside, and is ejected from the nozzle 23.
It is also vulcanized from the inside with steam at ~200℃, and the
The entire tire is cured in minutes. At this time, the surfaces 123'123' of the cavities 123, 123 of the tire pieces 130, 130 into which the rim 107 is inserted are not yet vulcanized since they have been molded with the core mold 20, so they are suitable for the rim 107. Adhere firmly. Furthermore, rim 1
Since the radius L1 of the cavity 123 of the tire pieces 130, 130 into which 07 is inserted is smaller than the radius L3 of the rim 107, the rubber is pressed by the rim 107 during pressing.
Adhesion between the rim 107 and the tire pieces 130 is performed accurately. Also, a part of the excess rubber pressed by the rim 107 bulges toward the hollow part 108 and comes into close contact with the band-shaped raw rubber C adhered to the rim 107.
Even if high-pressure water vapor is introduced into the rim 8, the water vapor is prevented from entering between the rubber and the rim 107. Therefore, the adhesion between the rim 107 and the tire pieces 130 is very strong. In addition, air that has entered the rubber of the tire pieces 130, 130 (air enters the rubber when the rubber is rolled) and gas generated inside the rubber due to heat expand at the temperature applied during vulcanization. Since this is suppressed by the high pressure of the water vapor contained in the hollow portion 108, a stable and uniform rubber structure can be obtained and a high quality tire can be molded. And hollow part 1
Due to the high pressure of water vapor in 08. Rubber and rim 1 that are pressed by the rim 107 and bulge in the hollow part 108
The band-shaped raw rubber C that had been in contact with the tire 07 is pressed against the rim 107, and the rim 107 and the tire pieces 130, 130 are even more firmly in contact with each other. In this way, after vulcanizing for 5 to 10 minutes by spouting steam at 140 to 200°C from the nozzle 23, the valve 24
' to stop the ejection of steam and open the hollow part 10.
The water vapor in the mold 8 is released to the atmosphere and left in that state for about 1 minute to bring the inside of the hollow part 108 to atmospheric pressure, and then the hydraulic device 8 moves the vertically movable frame 6 downward to connect the upper mold 12 and the lower mold. After separating the mold 11 and removing the nozzle 23, move the lower mold 11 toward the mouth on the left and right rails 10,
0.10. Pull out the wheel 100 to the tip of the lower mold 11.
Take it out. Then, the hole 112 formed in the outer circumferential part of the tire is inserted into the hole 112 formed in the outer circumference of the tire by the ejection pipe 23G of the nozzle 23. 1* A cylindrical rubber 113 with a diameter larger than the diameter of the hole 112 is press-fitted and closed, and the parts 27 and 27 of the lower mold 11 and the upper mold 12 where the lugs 102 are formed
The cylindrical rubber portions 114 that protrude laterally from the lugs 102 formed by fitting excess rubber during molding into the through holes 31...31' bored at the bottom of the Cut and remove it from its base.In addition, the cylindrical rubber protrudes laterally from the lugs 102, which are formed by fitting excess rubber during molding into the holes 35 provided in the lower mold 11 and upper mold 12. Since the amount of protrusion is small, the portions 115 may be left as they are, but if they have an adverse effect on the performance of the wheel, they are cut off from the base and removed.
A wheel 100 as shown in FIG. 19 is manufactured, and since a hollow portion 108 is formed inside the tire body 101, when mounted on a running vehicle, it provides good cushioning and good running performance. Furthermore, even if the tire body 101 is punctured by a nail or the like, there will be no problem because the inside of the hollow part 108 is originally at atmospheric pressure, and unlike conventional high-pressure pneumatic wheels, the tire will not become unable to run. , you can continue driving. This is because the shapes of the tire body 101 and lugs 102 of the wheel 100 left behind as described above are such that they support the running vehicle body almost in the same way as solid tires, even though there is a hollow part 108 inside. It is from.
More specifically, the thickness t of the portion 120 of the tire body 101 that is bonded to the rim 107 (the lower portion of the hollow portion 108) is formed to be thicker than the thickness t' of the upper portion 121 of the hollow portion 108. The upper portion 121 of the thin-walled hollow portion 108 is deformed by the reaction force of the load of the traveling vehicle body received from the road surface, and exhibits good cushioning properties of the wheel 100. Portion (lower portion of hollow portion 108) 12 of body portion 101 to be adhered to rim 107
Blocked at 0. Therefore, the tire of the wheel 100 has a hollow portion 108 inside while exhibiting good cushioning properties.
Despite this, they can support the vehicle body in roughly the same way as solid tires. Since the lug 102 has a hollow portion 108' communicating with the hollow portion 108 inside the base thereof, the stress applied to the lug 102 is applied to the hollow portion 108'.
' Due to the presence of the lug, the lug 102's entire base is absorbed by the bending, and since the hollow part 108' is in communication with the hollow part 108, the lug is absorbed by the hollow part 108, so the lug's base cracks and breaks. The cavity 1
08' and the hollow portion 108, the cushioning properties are improved and the running performance as a wheel is good. Finally, the boss 104 and spokes 106 of Car Import 100...
・The reinforcing iron plate 109 is colored with black paint of the same color as the rubber, and an annular groove 122 is formed on the side surface of the tire.
If a yellow or white paint is applied to only one side of the wheels (the side that is located on the outside when mounted on a running vehicle), the product value will increase and the direction of rotation of the wheel 100 will be set at lug 1.
If it is specified by the shape of 02 (almost all wheels with lugs for industrial machinery have a fixed rotation direction when mounted on the vehicle body), the wheel will be located on the outside when mounted on the vehicle body. A ring of conspicuous colored paint is applied only to the sides, which prevents the product from being installed in the wrong direction on the vehicle body. In the above embodiment, the core type 20k14Q
The core mold 20 is placed in the chamber 14 and adjusted to a temperature of 70°C to 110°C at which the raw rubber can be molded and not vulcanized in a short period of time. In addition, a temperature sensor may be provided on the surface of the core mold 20, and the temperature of the core mold 20 may be adjusted to 70° C. to 110° C. by controlling the electric heater and the cooling device based on the detection of the temperature sensor. ．．

[Brief explanation of drawings]

The figures show an embodiment of the present invention, in which Fig. 1 is a side view of a hydraulic press molding device, Fig. 2 is a plan view of the lower die 11, and Fig. 3 is a side view of the S and I parts in Fig. 2. S. Cross-sectional view, Figure 4 is the second
S, -S in the figure. 5 is a view taken in the direction of arrow F in FIG. 2, FIG. 6 is a bottom view of the upper mold 12, and FIG. 7 is a view taken in the direction of arrow F in FIG. -S.
The sectional view, FIG. 8, is taken from S4-S in FIG. 9 is a plan view of the medium size 20, and FIG. 10 is a cross-sectional view of S, -S. The sectional view, FIG. 11, is the S. -S. 12 is a sectional view taken along line 87-87 in FIG. 9, and FIG. 13 is a sectional view taken along S. −
S. Cross-sectional view, Figure 14 is a cross-sectional view explaining the action during molding, Part 1
5 is a perspective view of the raw rubber band D, FIG. 16 is a side view of the wheel body 110 to which the raw rubber C is adhered, FIG. 17 is a partially sectional side view of the molded axle 100, and FIG. The plan view and FIG. 19 are cross-sectional views taken from S-S in FIG. 17. Symbols in the figure, 14 is a hydraulic press molding device, 11 is a lower mold,
12 is the upper mold, 20 is the core mold. 23 is a nozzle, 31.31
' is a through hole (suction part), 46 is a protrusion, 100 is an axle,
101 is a tire body, 102 is a lug, 103 is a spoke covering part, 104 is a boss, 106 is a spoke, 107 is a rim, 108 is a hollow part, 123 is a hollow part, 123' is the surface of the hollow part 123, and 130 is a tire Show a piece.

Claims (1)

[Claims] (1) Tire pieces 130 and 130 are formed by outer molds 11 and 12 heated to a temperature that vulcanizes raw rubber in a short time and core mold 20 that is adjusted to a temperature that hardly vulcanizes raw rubber in a short time.
manufacturing a wheel by joining the tire pieces 130, 130 together by sandwiching the rim 107 between the surfaces 123', 123' formed by the core mold 20 of the tire pieces 130, 130, and integrally molding and vulcanizing them. Method.