CN220742232U - Carcass structure for improving air bubbles at bead of tire - Google Patents
Carcass structure for improving air bubbles at bead of tire Download PDFInfo
- Publication number
- CN220742232U CN220742232U CN202322246040.1U CN202322246040U CN220742232U CN 220742232 U CN220742232 U CN 220742232U CN 202322246040 U CN202322246040 U CN 202322246040U CN 220742232 U CN220742232 U CN 220742232U
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- China
- Prior art keywords
- inner liner
- layer
- tire
- carcass
- width
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Links
- 239000011324 bead Substances 0.000 title claims abstract description 16
- 229920001971 elastomer Polymers 0.000 abstract description 6
- 238000007142 ring opening reaction Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 description 11
- 238000000034 method Methods 0.000 description 9
- 238000003825 pressing Methods 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 238000012797 qualification Methods 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 210000004712 air sac Anatomy 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 229920000297 Rayon Polymers 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000012858 packaging process Methods 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000002964 rayon Substances 0.000 description 1
- 238000007665 sagging Methods 0.000 description 1
- 239000011265 semifinished product Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
Landscapes
- Tyre Moulding (AREA)
- Tires In General (AREA)
Abstract
The utility model discloses a carcass structure for improving air bubbles at a tire bead, which comprises an inner liner, a first rubber layer, a second rubber layer and a third rubber layer, wherein the inner liner is used for being attached to the outer circumferential surface of a forming drum; setting the width of the forming drum as A and the width of the lining layer as B, wherein the width of A-5mm is less than or equal to B and less than or equal to A+5mm; the inner side of the carcass layer is stuck with two airtight layer films, and the carcass layer is stuck to the outer side of the inner lining layer; the two airtight layer films are symmetrically arranged relative to the inner liner; the length of the overlapping part of each inner liner film and the inner liner is at least 10mm, and the length of each inner liner film beyond the edge of the forming drum is 25-35 mm; the two airtight layer films are lapped with the inner liner layer and are used for preventing air leakage in the tire. The problem that the inner liner is easy to fold and the finished tire is provided with ring-opening bubbles due to the fact that the two sides of the existing inner liner, which exceed the forming drum, are sagged is solved.
Description
[ field of technology ]
The utility model belongs to the technical field of tire structures, and particularly relates to a tire body structure for improving air bubbles at a tire bead.
[ background Art ]
With the continuous development of the automobile industry, the automobile conservation amount is continuously improved throughout the country and even the world every year. As an important part of automobiles, the demand of the market is also increasing. Tire production is a very complex process involving a combination of hundreds of raw materials and tens of processes. Under such a plurality of working procedures, a few production process problems always cause defective products in the production process, thereby reducing the qualification rate of tire production and causing cost waste. For example, when the tire blank is formed, the tire blank is formed by laminating and rolling various half parts layer by layer; when a certain half part is attached, wrinkles occur or the half part is not compacted, air is stored between the half parts, and air bubbles can occur in the finished tire after the tire blank is vulcanized, so that waste products are generated.
The inner liner is a very important part of the tyre in pure rubber, the main function of which is to ensure the air tightness of the tyre. For the secondary molding, the width of the lining layer is generally designed to be 50-60 mm (single side 25-30 mm) larger than the width of the molding drum, so that the air tightness of the ring opening part can be ensured. The inner liner is a pure film with the thickness of 1.0-1.4 mm, the part exceeding the forming drum can droop due to poor self-stiffness (as shown in figure 1), and the finished tire is folded in the reverse packaging process to cause the occurrence of ring mouth air bubbles.
At present, in the production process of the secondary method forming machine, a part of the inner liner, which exceeds the forming drum, is pressed and attached to the carcass by a side pressing roller, the carcass is a half part of the polyester or rayon framework material after glue is attached, the secondary method forming machine has certain stiffness, and the inner liner is attached to the carcass to prevent the carcass from being folded. However, the edge press roller is only a mechanical polyurethane stick, and has no motor controller rotation speed and pressure, and only drives the half part and the half part to rotate when the forming drum rotates. The liner discount still occurs when the drum rotation speed, or the pressure between it and the half-parts, does not match. In addition, for some special forming drums, such as an explosion-proof tyre forming drum and a small-size forming drum, even if an edge pressing roller is used, the probability of internal city folding is high, so that the finished tyre is provided with ring mouth bubbles, defective products are generated, and the cost is wasted.
[ utility model ]
The utility model aims to provide a carcass structure for improving air bubbles at a tire bead, which solves the problems that an existing inner liner layer is easy to fold and the finished tire is provided with the air bubbles at the bead due to sagging of the inner liner layer beyond two sides of a forming drum.
The utility model adopts the following technical scheme: a carcass structure for improving air bubbles at a bead of a tire includes an inner liner for being applied to an outer circumferential surface of a building drum; setting the width of the forming drum as A and the width of the lining layer as B, wherein the width of A-5mm is less than or equal to B and less than or equal to A+5mm; the inner side of the carcass layer is stuck with two airtight layer films, and the carcass layer is stuck to the outer side of the inner lining layer; the two airtight layer films are symmetrically arranged relative to the inner liner;
the length of the overlapping part of each inner liner film and the inner liner is at least 10mm, and the length of each inner liner film beyond the edge of the forming drum is 25-35 mm; the two airtight layer films are lapped with the inner liner layer and are used for preventing air leakage in the tire.
Further, the thickness of each inner liner film is 1.0-1.4 mm.
Further, the length of each air-tight layer film is D, and D is more than or equal to 45mm and less than or equal to 55mm.
Further, let the spacing between each inner liner film be C, then c=a-40.
The beneficial effects of the utility model are as follows: through reducing the width of inner liner to at the attached inner liner film of matrix layer inside lining, make inner liner and inner liner film overlap each other, both can prevent the gas leakage in the child, can avoid the problem that the inner liner is folded easily again, still reduced the incidence of circle mouth bubble, thereby promote tire production qualification rate, reduction in production cost.
[ description of the drawings ]
FIG. 1 is a schematic view of the state of use of an inner liner according to the background art;
FIG. 2 is a schematic representation of the carcass structure of the present utility model in use for improving air bladder in a bead of a tire;
fig. 3 is a schematic diagram of the dimensional relationship of a carcass structure for improved bead air bladder in a tire according to the present utility model.
The tire comprises a tire body layer 1, an inner liner layer 2, an inner liner layer 3, an inner liner film and a forming drum 4.
[ detailed description ] of the utility model
The utility model will be described in detail below with reference to the drawings and the detailed description.
The present utility model provides a carcass structure for improving the air-pocket of a tire bead, as shown in fig. 2 and 3, comprising an inner liner 2 for application to the outer side of a building drum 4; the width of the forming drum 4 is A, and the width of the lining layer 2 is B, so that A-5mm is less than or equal to B and less than or equal to A+5mm. In the prior art, the width of the inner liner 2 is generally designed to be 50mm-60mm larger than the width of the forming drum 4, so that the single side of the inner liner 2 exceeds the forming drum 4 by 25mm-30mm, and the part exceeding the forming drum 4 sags due to poor self-stiffness. The width B of the inner liner 2 is reduced to be basically equivalent to the width A of the forming drum, so that the inner liner 3 cannot sag and fold due to too much protruding of the drum edge of the forming drum 4. However, the present utility model also needs to ensure the air tightness of the inside of the tire, so the width of the inner liner 2 is designed to be within the range of: a-5mm is more than or equal to B and less than or equal to A+5mm. Meanwhile, the function of supporting the excess part of the inner liner layer by using the edge pressing roller in the prior art is lost, the use of the edge pressing roller can be canceled, and the production efficiency is improved.
The utility model also comprises a carcass layer 1, wherein the inner side of the carcass layer 1 is stuck with two airtight layer films 3, and the carcass layer 1 is stuck to the outer side of the inner lining layer 2; the positions of the two inner liner films 3 are symmetrically arranged with respect to the inner liner 2.
The inner liner layer 2 and the carcass layer 1 are mutually matched, the length of the overlapping part of each inner liner film 3 and the inner liner layer 2 is at least 10mm, and the two inner liner films 3 are overlapped with the inner liner layer 2 and are used for preventing air leakage in a tire. Each inner liner sheet 3 has a length of 25mm to 35mm beyond the edge of the building drum 4, which is designed to ensure tightness of the bead, since the inner liner sheet 3 is applied to the carcass layer, it is free from buckling.
Through such a size design, it can be ensured that when the carcass layer 1 is bonded with the airtight film 3, not only the air leakage in the tire can be prevented, but also the air tightness of the opening part of the ring can be ensured. Since the inner liner film 3 is attached to the carcass layer 1 having stiffness, no folding occurs at the time of turn-up. Wherein, the stiffness of the mixed rubber is also called cold flow resistance. It is an indicator of the maintenance of shape stability of the semi-finished rubber compound from shaping to curing. The sizing material has high stiffness and small cold flow, and the semi-finished product has stable shape. Since the inner liner 2 is a plain film and the carcass layer 1 is a half part of the fiber cord fabric with upper and lower adhesive, the stiffness is better than that of the inner liner 2.
In some embodiments, each inner liner film 3 has a thickness of 1.0 to 1.4mm. The thickness design of the inner liner 2 is different for tires with different sizes, the small-size inflation pressure is smaller, the thickness of the inner liner 2 is correspondingly thinner, the large-size inflation pressure is larger, the thickness of the inner liner 2 is thicker, and therefore the air tightness of the tire can be guaranteed, design interference can be prevented, and material waste is caused. The thickness of the airtight layer film 3 and the thickness of the inner liner 2 are kept consistent, so that the airtight performance of the ring mouth parts with different specifications is ensured.
In some embodiments, the length of each inner liner film 3 is D,45 mm.ltoreq.D.ltoreq.55 mm. The width of the air-tight layer film 3 is designed to be D, the width of the air-tight layer film 3 is 45mm less than or equal to D less than or equal to 55mm, the air-tight layer film 3 is ensured to be overlapped with the forming drum 4 by 20mm in combination with the positioning C=A-40 mm of the film, the width (single side) of the part exceeding the edge of the forming drum 4 is 25-35 mm, and the air tightness of the opening part of the ring is ensured.
In some embodiments, let the spacing between each inner liner film 3 be C, then c=a-40. The width and the positioning of all the half parts of the secondary forming machine are based on the width of the forming drum, and the overlapping amount of the single-side airtight layer film and the forming drum can be ensured to be 20mm by C=A-40 mm. The relationship between the width of the inner liner and the width of the forming drum is as follows: the A-5mm is less than or equal to B and less than or equal to A+5mm, so that the overlap joint amount of the air-tight layer film and the air-tight layer is 15-25mm, and the requirement that the overlap joint part of the air-tight layer film 3 and the inner liner 2 is at least 10mm is satisfied.
The utility model relates to a use method of a carcass structure for improving air bubbles at a tire bead, which comprises the following steps: the present utility model changes the size of the innerliner, as well as the carcass layer structure, but still uses a secondary process tire production process. Firstly, cutting a carcass layer 1 into a width required by construction on a cutting machine when the carcass layer 1 is sent to a forming workshop for forming; then in the process of cutting and winding the carcass layer 1, attaching two inner liner films 3 with corresponding widths and thicknesses on the inner side of the carcass layer 1 according to the positioning requirements of the inner liner films 3 and the inner liner 2; after the inner liner film 3 is attached, each half part is sent to a forming workshop, the inner liner 2 and the carcass layer 1 attached with the inner liner film 3 are sequentially attached on the forming drum 4 according to the process flow, and a section of carcass barrel is formed after forward packaging, reverse packaging and rolling.
According to the carcass structure for improving the air bubbles at the bead opening of the tire, the width of the inner liner is reduced, and the inner liner is adhered with the inner liner film, so that the inner liner and the inner liner film are mutually overlapped, the air leakage in the tire can be prevented, the problem that the inner liner is easy to fold can be avoided, the occurrence rate of the air bubbles at the bead opening is reduced, the production qualification rate of the tire is improved, and the production cost is reduced.
Claims (4)
1. Carcass structure for improving the air-pocket of a tyre bead, characterized in that it comprises an inner liner (2) for being applied to the outer circumferential surface of a building drum (4); setting the width of the forming drum (4) as A and the width of the lining layer (2) as B, wherein A-5mm is less than or equal to B and less than or equal to A+5mm; the inner side of the carcass layer (1) is stuck with two airtight layer films (3), and the carcass layer (1) is used for being stuck to the outer side of the inner liner layer (2); the two airtight layer films (3) are symmetrically arranged relative to the inner liner layer (2);
wherein the overlapping part of each air-tight layer film (3) and the inner liner (2) is at least 10mm in length, and the length of each air-tight layer film (3) exceeding the edge of the forming drum (4) is 25-35 mm; the two airtight layer films (3) are overlapped with the inner liner layer (2) and are used for preventing air leakage in the tire.
2. A carcass structure for improving air-pockets of a tyre according to claim 1, wherein each of said inner liner strips (3) has a thickness comprised between 1.0 and 1.4mm.
3. A carcass structure for improving air-bubbles at the bead of a tyre as claimed in claim 1 or 2, wherein each of said inner liner strips (3) has a length D of 45mm +.d +.55 mm.
4. A carcass structure for improving air-pockets of a tyre according to claim 1 or 2, wherein the spacing between each of said inner liner strips (3) is set to C, C = a-40.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322246040.1U CN220742232U (en) | 2023-08-21 | 2023-08-21 | Carcass structure for improving air bubbles at bead of tire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322246040.1U CN220742232U (en) | 2023-08-21 | 2023-08-21 | Carcass structure for improving air bubbles at bead of tire |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220742232U true CN220742232U (en) | 2024-04-09 |
Family
ID=90558914
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322246040.1U Active CN220742232U (en) | 2023-08-21 | 2023-08-21 | Carcass structure for improving air bubbles at bead of tire |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220742232U (en) |
-
2023
- 2023-08-21 CN CN202322246040.1U patent/CN220742232U/en active Active
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant |