JPH02245323A - Manufacture of wheel - Google Patents

Abstract

PURPOSE:To prevent forming rubbers from shifting from the specified positions on mold surfaces by a method wherein tire pieces are formed by an outer mold and a core mold under the condition that the forming rubbers are anchored to the predetermined positions by the rubber anchoring projections, which are provided on the mold surfaces of the outer mold and of the core mold. CONSTITUTION:Band-shaped green rubbers D preheated up to a temperature, which is formable and at which no vulcanization occurs in a short time, are seated on the mold surface 25 of a lower mold 11. At that time, the band-shaped green rubbers D are anchored by projections 50 under the condition that nicks locate at the middle of each lug forming part 27 and the green rubber D is positioned so as to face to parts 27.... In addition, band-shaped green rubbers D are also seated onto the mold surface 44 of the upper face of a core mold 20. At that time, the band-shaped green rubbers D are anchored by projections 51 under the condition that nicks locate at the middle of each lug forming projected part 46 and the green rubber D is positioned so as to face to projected parts 46.... By moving a vertically moving frame upwards until an upper mold, the core mold 20 and the lower mold 11 come into tight contact with one another, the band-shaped green rubbers D are formed by pressing with the respective mold surfaces 25 and 44.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a method for manufacturing an axle.

(Prior art and its problems) A method for manufacturing an axle 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 the prior art is based on a mold. When molding tire pieces, the rubber used for molding often shifts from the specified position, resulting in parts of the tire being chipped, making it impossible to obtain a clean tire. It wasn't.

C) Method for Solving Problems) In order to solve the problems of the conventional example described above, the present invention provides rubber locking protrusions 50 and 44 provided on the mold surfaces 25 and 44 of the outer mold 11 and the core mold 20. Rubber D for molding at...51...
After molding the tire pieces 130, 130 with the outer molds 11, 12 and the core mold 20 with the tires locked in a predetermined position, the tire pieces 130, 130 are molded into the core mold with the tire pieces 130, 130 remaining in the outer molds 11, 12. 20, and use the outer molds 11 and 12 to form a tire piece 130.
This is a manufacturing method of an axle in which 130 parts are joined and integrally formed.

(Operations and Effects of the Invention) This invention provides mold surfaces 25 and 44 of the outer mold 11 and the core mold 20.
The outer mold 11 is held in a state in which the molding rubber D is locked in a predetermined position by the rubber locking protrusions 50, 51, and so on.
12 and the core mold 20, the rubber D for molding is formed on the mold surface 25.
44 from the predetermined position, and a clean tire can be obtained.

(Example) A method for manufacturing a wheel, which is an example of the present invention, will be explained in detail based on the aspects.

First, a hydraulic press forming apparatus 1 for press forming an axle will be described. Reference numeral 2 denotes 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. Reference numeral 8 denotes a hydraulic device for vertically moving the vertically movable frame 6 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 the lower die 11 for forming the wheel is placed so as to be movable in the E-port direction. Reference numeral 12 denotes an upper mold for forming an 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 1
A bendable pipe that supplies 2 kg/aJ of water vapor to the inside of the lower mold 11 and the upper mold 12.
The temperature is 140~, which vulcanizes raw rubber in a short time.
It is kept at 200℃.

Reference numeral 14 denotes a temperature control bottom installed on the floor below the left and right rails 10 and 10, and an electric heater 15 and a cooling device 16 that are activated by detection of a temperature sensor are installed inside. The temperature is always maintained at 70°C to 110°C.

, 17 are left and right rails provided between the inside and outside of the temperature control pressure 14, and a movable table 19 having a grip part 18 is placed on the top of the rail so as to be movable along the rails. There is. Then, with the core mold 20 placed on the top surface of the movable table 19, the operator holds the grip part 18 and holds the movable table 1.
9 along the left and right rails 17.
The core mold 20 can be housed together with the movable table 19 in the temperature control bottom 14 through the entrance 21 of 4. Reference numeral 22 denotes a lid (door) that opens and closes the entrance of the temperature control bottom 14 by inserting and removing it in the vertical direction. Therefore, the temperature control sole 14 has a core mold 20.
is housed inside, and an electric heater 15 and a cooling device 16 are installed.
The temperature of the core mold 20 is adjusted to a temperature of 70° C. to 110° C. at which raw rubber can be molded and not vulcanized in a short period of time.

Reference numeral 23 denotes a nozzle attached to the tip of a bendable pipe 24, and is configured to eject water vapor at a temperature of 140 to 200° C. and a pressure of 12 kg/cd from the tip. A valve 24' is provided at the base of the pipe 24, and can be switched between a state in which water vapor is jetted from the tip of the nozzle 23 and a state in which water vapor is cut off and the inside of the pipe 24 is opened to the atmosphere. It is composed of

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

The lower mold 11 connects the one part 11a and the mold part 11b with the bolt 11c.
It is configured in a fixed manner.

25 is a mold surface carved into the upper surface of the mold part 11b,
Portion 2 that forms the tire body 101 of the wheel 100, which will be described later
6, a portion 27 for forming the lugs 102, and a portion 28 for forming the spoke covering portions 103, etc., are carved out of the outer shape of the rubber tire, and the surface thereof is formed into a rough surface.

Reference numeral 29 denotes a support bottle that passes through a hole 105 of a boss 104 of the axle 100, which will be described later, and is fixed at the center of the upper surface of the one-piece portion 11a. 30 is a spoke 106 of a wheel 100 which will be described later.
These are spoke support parts that support the mold part 11b, and are provided at three locations on the upper surface of the mold part 11b. Therefore, the rim 1 of the axle 100 is supported by the support pin 29 and the three spoke support parts 30...
07 can be positioned at a predetermined position on the mold surface portion 25. A movable support body 30a that is vertically movable is provided at the center of the spoke support portion 30, and is biased in the upward movement direction by a spring 30b.

31... is the part 2 of the mold part 11b that molds the lug 102
This is a through-hole as a suction part bored in the bottom of 7. 32
is a through hole bored across the upper surface and side surface of the base portion 11a, and a pipe 33 is provided in the side portion thereof. 34, 34 are seals, and the through holes 31...
It is provided in the Nissin carved on the upper surface of the base part 11a between the openings of . and 32. However, when the pipe 33 is connected to a vacuum pump to create a vacuum state between the seals 34 and the raw rubber is placed on the mold surface 25 and press-molded, the through-hole 3
1... is applied as a negative pressure so that the rubber spreads all the way to the bottom corner of the portion 27 where the lug 102 is to be formed.

Reference numeral 35 denotes a hole provided on the outer periphery of the mold surface 25, and is provided so that when raw rubber is placed on the mold surface 25 and press-molded, the rubber spreads all the way to the outer periphery corners of the mold surface.

Reference numerals 50, . . . are rubber locking projections (thin pins) provided on the bottom surface of the mold surface 25, which prevent the raw rubber from sticking and shifting when the raw rubber is placed on the mold surface 25.

Reference numeral 36 denotes a hole provided inside the platform 11a, and the bendable pipe 13a for supplying water vapor at a temperature of 140 to 200°C and a pressure of 12 kg/- is connected to the hole entrance 36a.
The water vapor is introduced into the hole 36,
The raw rubber is discharged from the hole outlet 36b through a bendable pipe 138', and the temperature of the lower die 11 vulcanizes the raw rubber.
．． The temperature is maintained between 0 and 200°C.

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.
637b... is a through hole provided in the lower mold 11, into which the core mold 20 described later is inserted.
The positioning fitting pins 43 provided in are provided so as to fit therein.

39 has a temperature of 140 to 200°C and a pressure of 1 from the tip.
This is a stand on which the nozzle 23 that spouts 2 kg/aJ of water vapor is set, and its upper surface has a vertical groove 39a 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 jetting groove of the nozzle 23. A vertical groove 39c into which the tube 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 portion 11b is fitted.

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

The upper mold 12 connects the one unit part 12a and the mold part 12b with bolts 12C.
It is configured in a fixed manner.

Reference numeral 25' denotes a mold surface carved into the lower surface of the mold part 12b, which molds a part 26' for molding the tire body 101 of the axle 100, a part 27' for molding the lugs 102, and a spoke covering part 103, which will be described later. The portion 28' etc. are carved, and the surface thereof is formed into a rough and 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.

Reference numerals 31', . . . are through-holes, which serve as suction parts, formed at the bottom of the portion 27' of the mold part 12b for molding the lug 102.

Reference numeral 32' denotes a through hole bored 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 sandwich the openings of the through holes 31' and 32' and seal the base part 12.
The Nissin symbol is carved on the underside of a. Thus, the pipe 33' is connected to a vacuum pump and the seal 34'
34' is in a vacuum state, and when raw rubber is put into the mold surface 25' and press-molded, negative pressure is applied to the through holes 31' so that the rubber spreads to the bottom corner of the part 27' where the lug 102 is to be molded. It has become.

Reference numeral 35' denotes a hole provided in the outer periphery of the mold 41, and is provided so that when raw rubber is put into the mold surface 25' and press-molded, the rubber spreads all the way to the outer periphery corners of the mold surface.

Reference numeral 36' denotes 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 3.
6a', the water vapor is introduced into the hole 36', and the pipe 13b is bent freely from the hole outlet 36b'.
', and the upper die 12 is kept at a temperature of 140 to 200°C to vulcanize the raw rubber.

38 are fitting bins 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 mold surfaces 25 and 25'.

Reference 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 body 30a' that is vertically movable is provided at the center of the spoke support part 30', and is biased in the downward movement direction by a spring 30b'.

Next, the core mold 20 will be described. On its second and lower surfaces, there are a portion 45 for molding a hollow portion 108 of a tire body 101 of an axle 100, which will be described later, and lugs 102 of a lower mold 11 and an upper mold 12. When press-molding the parts 27 and 27' to be molded, apply rubber to the parts 27 and 27' so that the rubber spreads all the way to the bottom corners.
・Protrusion 46 to be pushed into 27' (the protrusion 46...
・Lug 102 formed by pressing with...Inner cavity 1
08'... are formed in communication with the hollow portion 108. ) and a cavity 123 into which the rim 107 of the axle 100 is inserted.
(If the protrusion amount of the portion 47 is Ll, the radius of the cavity 123 is also Ll.
The radius L1 of the rim 107 is set to be smaller than the radius L2 of the rim 107. ) and the spokes 10 of the axle 100
A portion 48 for forming a cavity into which 6 is inserted, and a lower mold 11
and the upper mold 12 into two half-split tire pieces 13.
Joining distance E1/E where the outer circumference and inner circumference of 0.130 are joined
A mold surface 44 consisting of annular groove portions 60 and 61 for molding 2.
・44 is carved. The surfaces of the mold surfaces 44 are subjected to silicone baking treatment (or fluorine coating treatment) so that the rubber can be easily removed after molding.

Numerals 51, . . . are rubber locking protrusions (thin pins) provided on the upper surface of the mold surface 44, which prevent the raw rubber from getting stuck and shifting when the raw rubber is placed on the mold surface 44.

42... are through holes through which the fitting pins 38... of the upper die 12 pass, and 43... are through holes 37 provided in the lower die 11.
It is a fitting pin for positioning that fits into b....

Reference numerals 49 and 49 denote left and right suspension parts on which wires of a lifting device or the like are hung 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 E mold 12 heated to 0°C, and a core mold 20 whose temperature is controlled at 70 to 110°C, which can mold raw rubber and not vulcanize in a short time. , a method for forming the axle 100 will be explained.

First, the iron cylinder boss 1 for attaching the wheel to the axle.
04, an annular rim 107 made of iron pipe, and spokes 106 made of three iron vibrators are welded together to prepare an axle body 110. still.

Boss 104 and spokes 106... are reinforced iron plates 109
Reinforced and connected.

Then, adhesive A for bonding rubber and adhesive B for bonding iron are applied to the entire wheel body 110.

After drying, adhesive A for adhering rubber is applied to the rubber covered portions of the spokes 106 and the annular rim 107.

Next, a solution of rubber dissolved in a solvent is applied to the outer periphery of the annular rim 107, and a band-shaped natural raw rubber C with good adhesiveness is adhered to the outer circumference of the annular rim 107. Apply.

Next, the lower mold 11 is moved from the position facing the upper mold 12 on the left and right rails 10, 10 toward the opening.
10 at the tip. Then, the band-shaped raw rubber D is preheated to a temperature of 70 to 110 degrees Celsius, which is moldable and does not vulcanize in a short time. is placed on the mold surface 25 of the lower mold 11. At that time, the cut is lag 1
The band-shaped raw rubber D is locked with the protrusion 50 so that it is located in the middle of the parts 27, 27 where 02 is to be molded, and the raw rubber is positioned exactly between the parts 27, 27, .

Then, the core mold 20 is taken out from the temperature-controlled warehouse 14, and its fitting pins 43... are inserted into the through holes 37b provided in the lower mold 11.
. . and stack it on top of the bottom mold 11.

Then, the band-shaped raw rubber D is also placed on the mold surface 44 on the upper surface of the core mold 20. At that time, in the same way as when the band-shaped raw rubber D was placed on the lower mold 11, the protrusion 4 where the cut forms the lug 102 is formed.
The band-shaped raw rubber D is locked with the protrusion 51 so that the raw rubber is located in the middle of the protrusions 46 and 46.

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 fitting pins 38 of the upper mold 12 are The holes 3 of the lower mold 11 pass through the through holes 42 of the core mold 20.
7a, the hydraulic device 8 is operated to move the vertically movable frame 6 upward until the upper mold 12, the core mold 20, and the lower mold 11 are brought into close contact with each other. At that time, the press pressure between each mold is 1
00~120kg/d, about 29 times. Then, the raw rubber band D has each mold surface 25, 25', 44, 4
4 to form the tire body 10 of the wheel 100.
1. A cavity 123 into which the lugs 102, spoke covering parts 103, and rim 107 are inserted is formed.

At this time, the lug 102... portion is pressed by the protrusion 46... formed on the core mold 20 and the portion 27...27' of the lower mold 11 and upper mold 12 that molds the lug 102.・The lug 102 of the lower mold 11 and the second mold 12 is suctioned by a vacuum pump from the through hole 31 bored in the bottom of the
The rubber is sufficiently spread to the bottom corners of the parts 27...27'... to be molded neatly. After the upper mold 12 and the core mold 20 are separated by moving the vertically movable frame 6 downward by the hydraulic device 8, the lower mold 11 is moved onto the left and right rails 10, 10 while the core mold 20 is stacked. The core mold 20 is moved toward the mouth and pulled out to the tips of the left and right rails 10, 1o, and 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, core mold 2
The surfaces of mold surfaces 44 and 44 of 0 are treated with silicone baking (or fluorine coating treatment) so that the rubber can be easily removed after molding, and the mold surfaces 25 and 25 of lower mold 11 and upper mold 12 are Since the surface of ' is roughened to make it difficult for the rubber to separate, the molded half tire pieces 130 remain in the lower mold 11 and the upper mold 12, respectively.

In this way, as shown in FIG.
0.130 is molded, but the lower mold 11 and the upper mold 1
The joint allowances E and E2 of the respective half-split tire pieces 130 and 130 protrude from the joint surface with the core mold 20 (portions formed by the annular groove portions 60 and 61 of the core mold 20), and Since the joining allowances E1 and E2 are formed using the core mold 20 and have not yet been vulcanized, the halved tire pieces 13 will be formed in the next process.
When 0.130 is joined together and vulcanized, it becomes one piece,
The two half-split tire pieces 130 are firmly adhered and molded. Further, the shape of the joint allowance E1 is formed in an inclined shape such that the protrusion amount d1 is small on the outer peripheral side (outer surface side) of the tire and the protrusion amount d1 is large on the inner side of the tire.

When joining the two half-shaped tire pieces 130 and 130 together, the outer circumferential side, which is in contact with the lower die 11 and the upper die 12 and affects the outer surface where vulcanization is progressing, is only necessary for adhesion. The amount of protrusion is small, so as not to apply too much pressing force to the outer surface where vulcanization is progressing during bonding to prevent wrinkles, lines, etc. from forming on the surface, and to prevent the lower mold 11 and upper mold 12 from forming wrinkles or lines. The amount of protrusion is increased on the unvulcanized inner side which is not in contact, so that when joining, excess rubber swells in the hollow part 108 and forms a raised part 111, so that sufficient adhesive strength can be obtained.6 Next, the above-mentioned The support pins 29 of the lower die 11 are inserted into the holes 105 of the bosses 104 of the wheel body 110 to which a band-shaped raw rubber C is adhered to the outer periphery of the annular rim 107, and the spokes 106 are supported by the spoke support parts 30. The rim 107 of the axle body 110 is positioned in the cavity 123 into which the rim 107 of the half-split tire pieces 130 of the lower die 11 is inserted.

Then, the lower die 11 is again moved in the direction A on the left and right rails 1o and 10 to a position facing the upper die 12, and the nozzle 2
3. Tire piece 130.1 whose tip end is halved
The base 39 of the lower mold 11 is positioned in the hollow part 108 of the lower mold 11.
The nozzle 23 is installed in the upper die 12, and the positioning fitting pins 38 of the upper die 12 are fitted into the holes 37a of the lower die 11, and the hydraulic device 8 is turned on until the upper die 12 and the lower die 11 come into close contact with each other. It is activated to move the vertically movable frame 6 upward. Both types 1 at that time
The press pressure between 1 and 12 should be higher 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.
/a! emit water vapor.

Then, the tire is heated by the lower mold 11 and the upper mold 12 (temperature 140
The tire is vulcanized from the outside at a temperature of 140 to 200° C.) and also from the inside with steam of 140 to 200° C. ejected from the nozzle 23, and the entire tire is vulcanized in 5 to 10 minutes.

At this time, the surfaces 123'123' of the cavities 123, 123 of the tire pieces 130, 130 into which the rim 107 will be 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 Lt 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. Further, a portion of the excess rubber pressed by the rim 107 bulges toward the hollow portion 108 .

Since it is in close contact with the band-shaped raw rubber C that is adhered to the rim 107, even if high-pressure water vapor is introduced into the hollow portion 108, 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 and 130 (air enters the rubber when it 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
The rubber and rim 1 are pressed by the rim 107 and bulged in the hollow part 108 by the high pressure of the water vapor contained in the rim 108.
The band-shaped raw rubber C that had been adhered to 07 is pressed against the rim 107, and the rim 107 and the tire pieces 130, 130 are even more firmly adhered.

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 inside the mold 8 is released to the atmosphere and left 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 separate 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 1°O to the tip of the lower die 11
Take it out.

Then, a hole 112 formed in the outer circumference 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 that of the hole 112, and the lower mold 1
1 and the parts 27 and 27' of the upper mold 12 where the lugs 102 are formed.
The cylindrical rubber part 114 protrudes laterally from the lug 102, which is formed by fitting excess rubber during molding into the through holes 31...31'... drilled in the bottom of the A cylindrical rubber part that is cut and removed from the root part, and that protrudes laterally from the lug 102, which is formed by fitting excess rubber during molding into the holes 35 provided in the lower mold 11 and upper mold 12. 1
No. 15... can be left as is since the amount of protrusion is small, but if it has a negative effect on the performance of the wheel, it should be cut off from its base and removed.

In this way, an axle 100 as shown in FIGS. 17 to 19 is manufactured, and the tire body 10 is
Since a hollow part 108 is formed inside the tire body, when it is mounted on a running vehicle, it provides good cushioning and good running performance, and even if there are some holes caused by nails or the like stuck in the tire body 1. Since the inside of the hollow portion 108 is originally at atmospheric pressure, there is no problem, and the vehicle can continue to travel without becoming unable to travel unlike a conventional high-pressure pneumatic axle. This is because the shape of the tire body 101 and the lug 102 of the axle 100 manufactured as described above is such that even if there is a hollow part 108 inside, it supports the running vehicle body almost in the same way as a solid tire. 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 part 121 of the thin-walled hollow part 108 is deformed by the reaction force of the load of the traveling vehicle body received from the road surface, and the axle 100 exhibits good cushioning properties. 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 axle 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 lug 102
The stress applied to the lug 10 due to the presence of the cavity 108'
2. It is absorbed by the flexure of the entire base, and the hollow part 108
Since the hollow part 108' is in communication with the hollow part 1
08, the base of the lug is less likely to be cracked and damaged, and the existence of the hollow portion 108' and the hollow portion 108 improves cushioning properties and provides good running performance as an axle.

Finally, the boss 104 and spokes 106 of the axle 100...
・The reinforcing steel 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 only to the outer side of the wheel (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 adjusted to lug 1.
When specified by the shape of 02 (almost all axles with lugs for agricultural machinery have a fixed rotational direction when mounted on the vehicle body.

), when it is installed on a vehicle, a ring-shaped conspicuously colored paint is applied only to the outer side, which prevents it from being installed in the wrong direction on the vehicle.

[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 5l-S1 in Fig. 2. Cross-sectional view, Figure 4 is the second
S, -S in the figure are cross-sectional views, FIG. 5 is a view taken in the direction of arrow F in FIG. 2, FIG.
9 is a plan view of the core mold 20, FIG. 10 is a sectional view of S, -S in FIG. 9, and FIG. S, -S, sectional view of Fig. 9; Fig. 12 is S, -8, sectional view of Fig. 9; Fig. 13 is S, -S of Fig. 9;
-S. 14 is a sectional view illustrating the action during molding, FIG. 15 is a perspective view of the raw rubber strip D, FIG. 16 is a side view of the axle body 110 to which raw rubber C is adhered, and FIG. 17 is the formed axle. 100 is a partially sectional side view, FIG. 18 is a plan view of FIG. 17, FIG. 19 is a cross-sectional view of S, -S of FIG. 17, and FIG. A plan view showing the condition,
FIG. 21 is a plan view showing a state in which the raw rubber band D is placed on the core mold 20. Symbols in the figure: 1 is a hydraulic press molding device, 11 is a lower mold, 1
2 is the upper mold, 20 is the core mold, 23 is the nozzle, 25 is the lower mold 1
1 is the mold surface, 25' is the mold surface of the mold 12, 31 and 31' are the through holes, and 44 is the mold surface of the core mold 20. 46 is a protrusion, 50 and 51 are protrusions (thin pins), 100
1 is a wheel, 104 is a tire body, 102 is a lug, 103 is a spoke covering part, 104 is a boss, 106 is a spoke, 1
07 is a rim, 108 is a hollow part, 123 is a hollow part, 130
indicates a tire piece.

Claims (1)

[Claims] (1) Rubber D for molding is provided at the rubber locking protrusions 50..., 51... provided on the mold surfaces 25, 44 of the outer mold 11 and the core mold 20.
After molding the tire pieces 130, 130 with the outer molds 11, 12 and the core mold 20 with the tires locked in a predetermined position, the tire pieces 130, 130 are molded into the core mold with the tire pieces 130, 130 remaining in the outer molds 11, 12. 20, and use the outer molds 11 and 12 to form a tire piece 130.
A method of manufacturing a wheel by joining 130 parts and molding them into one piece.