JP2824052B2 - Radial tires for heavy loads - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention
Tires, more specifically for trucks or buses
In connection with improving the durability of radial tires for loads,
The belt ends to strengthen the tires and the main reinforcement of the tires.
Of the separation that tends to occur at the end of the ply of the carcass
The present invention relates to a heavy-load radial tire for which prevention is intended. 2. Description of the Related Art Beads for pneumatic radial tires are generally used.
Carcass ply wrap to improve the durability of the part
Examination of the method, chafer as a reinforcing member, or
Considering the material and structure of stiffeners, etc.
Came. But all means work for some sizes
Even if it is difficult to fit other sizes,
Or there is a negative effect that leads to a significant rise in costs.
Has not reached a fundamental solution. [0003] The present invention relates to a method for filling a tire with internal pressure.
About controlling tire shape changes
Improve tire durability by introducing innovative techniques
New knowledge that the strain distribution inside the tire suitable for the vehicle can be obtained
Useful modification of radial tires for heavy loads described above
It has achieved good. [0004] The carcass shape of a tire depends on the performance of the tire.
Changes in tire shape before and after filling with internal pressure
Shows a uniform bulging deformation, so-called natural equilibrium shape
I have been. In contrast, when filling the tire with internal pressure
Conventional on controlling changes in tire shape
The following disclosure can be given as an example of the technique. That is, in US Pat. No. 4,155,392,
According to the illustration in Fig. 3, the tire
Decreasing significantly toward the radial inside of the tire
More specifically, tensile strain on sidewalls is reduced.
To improve tire life.
However, in this case the filling of the internal pressure is especially
Also move in the axial and radial directions of the tire together
As the initial tension on the belt decreases,
Exercise performance and end durability of the belt deteriorate. [0006] Japanese Patent Application Laid-Open No. 55-83604 also discloses
A similar concept was disclosed, and in this case, too,
The part from the end to the shoulder is filled with normal internal pressure.
It moves in the axial and radial direction of the tire by the balance,
As a result, the initial tension of the belt decreases,
Getting worse. Further, JP-A-58-1616 and JP-A-59-482
No. 04 publications provide information on tires by changing the tire shape.
Although a technique for reducing the rolling resistance of the yaw has been disclosed,
In the change of the tire shape, by filling the regular internal pressure
Since the upper area of the sidewall bulges and deforms, beads
The amount of swelling and deformation of the tread and tread is insufficient.
The strain distribution inside the tire is not
Sufficient durability for ears cannot be obtained. [0008] Accordingly, the present invention is claimed.
The invention described in claim 1 and claim 9 and claim 2 to claim 8
The embodiments described in the claims 10 to 16 are different from the tires in that
The durability of the belt and belt parts is simultaneously more advantageous and less expensive.
Of radial tires for heavy loads that can be improved
For the purpose of providing. [0009] To achieve the above object,
Thus, the invention described in claim 1 of the present invention
Non-extensible cord extending from the bead to the other bead
At least one ply of radial carcass using
A belt is provided around the carcass to strengthen the tread.
Heavy-duty radial tires
Rims that are narrower than the standard rim width
Apply the regular internal pressure to the tire and rim assembly attached to the standard rim.
Radial breakage of tires filled with micro pressure equivalent to 5% of
Carcass ply carcass line C
Under no load on the rim from the rim diameter line RL
The maximum height of the carcass line C is defined as height H, and the rim diameter line
0.55 times the maximum height H radially outward from the RL
A straight line parallel to the tire rotation axis that separates the distance LH corresponding to
jj ′ and the radius at the maximum width position of the carcass line C.
Intersection I with the tangent mm 'in the Al direction is the intersection point I, the tire equatorial plane M
The width W of the narrow rim is set to 0.
With respect to the perpendicular qq 'which is set up on the rim diameter line RL with a distance of 5 times.
The intersection of the carcass lines C
Are defined as intersection J and intersection K, these intersection J and intersection K
Between the carcass line C and the intersection J
To the outside of the tire, including the overlap,
The carcass line C is separated from the intersection I through the intersection K
Circle outside the tire of the arc KI that touches the tangent mm '
Separated from the arc KI, the carcass line C and the tangent m
the point A of contact with the point m ′ is radially outward with respect to the intersection point I
Point J, Point A that satisfies each relative positional relationship
And a compound curve that smoothly connects the points K.
Tire and rim having curved carcass line C
From the time of filling the assembly with low pressure to the completion of filling with regular internal pressure
The entire area of the tread crown is the radial direction of the tire.
Overhang outward and deform to reach the tread edge of the tread.
The upper part of the sidewall from the tire to the tire maximum width position is in Thailand
Dents toward the inside of the tire,
Side wall up to the point of contact with the rim flange on the ear surface
The lower region of the tire expands and deforms toward the outside of the tire.
It is a radial tire for heavy loads to be characterized. [0010] Here, the carcass line is the radiation of the tire.
Connecting the center of the thickness of the carcass ply in the cross section in the vertical direction
And the rim diameter line RL is the nominal rim diameter.
Straight line parallel to the tire rotation axis without passing through the actual rim diameter position
Say. In carrying out the invention described in claim 1,
Therefore, it is possible to specify the maximum value ranges of the above three types of separation distances.
Practical, but especially for truck and bus ties
For tires, tube-mounted tires (W / T tires)
The shape (flattening rate) of a tubeless tire (T / L tire)
), And the profile of the applied rim is significantly different
It is reasonable to specify both separately. Therefore, the rim to which the W / T tire is applied is wide.
Claim 2 for the W / T tire because it is a flat bottom rim.
Engages the bead portion of the tire as in the embodiment described in
Rim bead seat is about 5
In the tire attached to the applicable rim having an angle of °,
Maximum separation distance between the line segment JI and the carcass line C
v, with respect to the maximum height H, the following relationship 0 ≦ (240 / H) × v <3.5, and the maximum of the carcass line C separated from the arc KI.
With respect to the distance w, the following relationship 4.0 <(240 / H) × w <9.5 is satisfied with respect to the maximum height H, and the distance of the contact point A to the outside in the radial direction with respect to the intersection point I is satisfied.
The following relationship 15.0 <(240 / H) × x <35.0 must be satisfied for the maximum height H for the separation distance x.
Is suitable. Next, the applicable rim of the T / L tire is 15 ° deep.
Since it is a rim, the T / L tire is described in claim 3.
Engages the bead portion of the tire as in the embodiment shown
The bead seat of the rim is about 15 ° to the tire rotation axis.
In the tire mounted on the applicable rim having an angle,
To the maximum separation v between line segment JI and carcass line C
Accordingly, the following relationship 0 ≦ (210 / H) × v <5.0 is satisfied with respect to the maximum height H, and the maximum of the carcass line C separated from the arc KI
The distance w satisfies the following relationship with respect to the maximum height H: 2.0 <(210 / H) × w <8.0, and the distance of the contact point A to the outside in the radial direction with respect to the intersection point I.
For the separation distance x, the following relationship with respect to the maximum height H is satisfied: 6.0 <(210 / H) × x <30.0.
Fit. Further, in order to achieve the above object, another invention and
Then, the invention described in claim 9 of the present invention provides one of the
Non-extensible core extending from the bead to the other bead
At least one ply radial carcass
And a belt that strengthens the tread around the carcass
The radial tire for heavy load comprising:
The applicable rim is narrower than the standard rim width
Or the tires and rim assemblies attached to the standard rim
Radiation of tire filled with micro pressure equivalent to 5% of internal pressure
Carcass ply carcass line C in the cross section
When the rim diameter line RL is
The maximum height of the carcass line C is H, and the rim diameter is
0.5 of the maximum height H from the line RL outward in the radial direction
Parallel to the tire rotation axis, which is separated by a distance LH equivalent to 5 times
La at the maximum width position of the straight line jj 'and the carcass line C
Intersection I with tangential line mm 'in the radial direction, intersection I, rim diameter line
0.3 times the maximum height H from the RL radially outward
A straight line parallel to the rim diameter line RL at a distance MH
kk 'crosses the carcass line C below the sidewall
The point of intersection is the intersection R, from the tire equatorial plane M to the tire rotation axis direction
The rim diameter is shifted outward by 0.5 times the width W of the narrow rim.
The vertical line qq 'on the inner RL is above the sidewall
The point of intersection with the carcass line C was defined as the intersection K
When the carcass extends between these intersections R and K,
The line C passes through the intersection R and at the intersection I with the above tangent mm '.
The car is separated from the contacting arc IR by the inward of the tire.
The dashed line C passes through the intersection K and at the intersection I, the tangent m
The arc KI in contact with m 'is separated outward from the tire,
The point of contact A between the focus line C and the tangent line mm '
Radially outward with respect to each other
Point R, point A and point K satisfying the positional relationship are connected smoothly.
A carcass line consisting of a composite curve
From the time of low pressure filling of tire and rim assembly with
Until the filling of the regular internal pressure is completed, the crown of the tread
The entire area of the tire protrudes outward in the radial direction of the tire and changes.
From the tread edge of the tread to the tire maximum width.
The upper part of the sidewall is dented and deformed toward the inside of the tire
From the tire maximum width position to the rim flange on the tire surface.
The lower area of the sidewall up to the point of contact with the outside of the tire
Radial for heavy loads characterized by expansion and deformation
Tires. [0015] The carcass according to the ninth aspect of the present invention.
The line and the rim diameter line are also defined as described in claim 1.
And the invention according to claim 9 is implemented.
In doing so, specify the maximum value ranges of the above three types of separation distance.
Is practical, especially in trucks and
For bus tires, W / T tires and T / L tires
In the case of the invention described in claim 1
Is the same as [0016] First, regarding the W / T tire,
Item 10. The tire bead portion according to the embodiment described in Item 10.
The bead seat of the rim that engages with the tire rotation axis
To the tire to be attached to the applicable rim having an angle of about 5 °.
And the carcass line C separated from the arc IR
When the following relationship 6.0 <(240 / H) × y <11.5 is satisfied with respect to the maximum height H for the maximum distance y of
The maximum of the carcass line C separated from the arc KI
The distance w satisfies the following relationship with respect to the maximum height H: 4.0 <(240 / H) × w <9.5, and separates the contact point A outward in the radial direction with respect to the intersection point I.
The following relationship 15.0 <(240 / H) × x <35.0 must be satisfied for the maximum height H for the separation distance x.
Is suitable. Next, regarding the T / L tire, claim 11
Engages the bead portion of the tire as in the embodiment described in
Rim bead seat is about 15
In the tire attached to the applicable rim having an angle of °,
The maximum of the carcass line C separated from the arc IR
The distance y satisfies the following relationship with respect to the maximum height H: 3.0 <(210 / H) × y <8.0 and the maximum of the carcass line C separated from the arc KI.
The distance w satisfies the following relationship with respect to the maximum height H: 2.0 <(210 / H) × w <8.0, and the distance of the contact point A to the outside in the radial direction with respect to the intersection point I.
For the separation distance x, the following relationship with respect to the maximum height H is satisfied: 6.0 <(210 / H) × x <30.0.
Fit. According to the first and ninth aspects of the present invention,
Regarding the ear, between the time of filling with regular internal pressure and the time of filling with low pressure
Is similar to the embodiment described in claim 4 and claim 12.
In addition, regular internal pressure filling for the above tire and rim assembly
From the tire maximum width position on the carcass line C
Tie the leg n of the lowered normal and the flange of the narrow rim above.
The method of dropping on the carcass line C from the point where the surface contacts
Of the lower region of the sidewall extending between two points with the line n '
The shape of the carcass line C is a slight pressure equivalent to 5% of the normal internal pressure.
Curve or straight line with center of curvature inside the tire when filling
It is suitable to be either. Claim 1 and Claim
The composite curve described in item 9 is a composite curve of a curve and a curve
And the case of a composite curve of a curve and a straight line.
Shall be considered. Further, the invention described in claim 1 and claim 9
Regarding tires, when filling with fine pressure and when filling with regular internal pressure
In the meantime, the embodiment of claim 5 and claim 13
As described above, the tire with no load applied to the tire
And filling of the rim assembly from low pressure to regular internal pressure
Between the tread width center from one tread width end
The entire area of the crown that passes through to the other end of the contact width is
0.5 to 4.0 mm radially outward of the tire
From the tread edge of the tread
The upper area of the sidewall up to the maximum width position is inside the tire
Maximum deviation d in the range of 0.5 to 4 mm toward
At the tire width from the tire maximum width position.
The lower area of the sidewall up to the point of contact with the flange of the
Maximum tension in the range of 3-12mm towards the outside of the tire
It expands and deforms when it comes out. An embodiment according to claim 5 and claim 13.
Swelling g, maximum displacement d and maximum overhang
Actual values are shown for f.
And the tire according to the invention described in claim 9
From low pressure to regular internal pressure
Tire deformation that occurs during
Swelling in the belt area
At least the end of the cord layer having the maximum width in the tire rotation axis direction
The tension of the part, and
The swelling causes a compressive stress on the rubber near the folded end. The invention described in claim 1 and claim 9
The tire described in claim 5 and claim 13 described above.
According to the tire deformation in the embodiment, claim 6
As in the embodiment described in claim 14,
Of the tire and rim assembly under no load
Sidewalls between pressure filling and regular internal pressure filling
Contact point of cross-sectional contour before and after dent deformation in upper region of wall
Or a tire at a portion extending between the points F and G at the intersection
Preferably, the surface length c is at least 20 mm.
Combine. [0022] Further, the present invention as defined in claim 4 and claim 12 is applicable.
As a further development of the embodiment, claim 7 and the contract
As in the embodiment described in claim 15, normal internal pressure filling
Rim diameter line R at the folded end of the carcass ply after
Height HE from L is the maximum tire height after filling with regular internal pressure
It is suitable to be in the range of 10 to 35% of the SH. [0023] Further, according to claim 6 and claim 14,
As a further development of the embodiment, claims 8 and
As in the embodiment according to claim 16, normal internal pressure charging
Side wall measured from the tire maximum width position
Radial distance h to point G above
Of the maximum tire height SH after filling the internal pressure
It is suitable that it is 0.15 times or less. Embodiments of the present invention will be described below.
This will be described with reference to FIGS. FIG. 1 and FIG.
Heavy duty radial tires according to the
(T tires and T / L tires)
To the tire and rim assembly with the
Thailand in standard form with micro pressure equivalent to 5%
Radial carcass line 1 in radial section
And the tire profile 2 specified by the
The right half is shown. The radial carcass is one bead part
Non-extending from the other bead (not shown)
Sex cord, for example steel cord or aromatic polyamide
At least one ply that becomes a radial sequence such as code
Having at least one ply embedded in the bead portion
Winded around the bead core from inside the tire to outside
It has a folded part and strengthens the tread on the outer periphery of the carcass
Continuing to discuss tire deformation
Illustrations are omitted because they may complicate the illustration under the behavior.
But laying it almost all over the width of the tread
This is almost the same as the arrangement in the conventional tire. Here, the reference form of the tire is as described above.
This is what was defined in the state of micro-pressure sealing prior to shape change.
In the invention, when the rim is assembled, the bead part is slightly set in the mold.
Widen the width of the molded vulcanized bead to reduce the tire size.
Of standard rims or wider than applicable rims
When mounted on a narrow rim, the shape of the tire
To maintain a self-supporting state that is uniform throughout each section of the
This is to ensure that Here, tires that are difficult to fit when assembled on the rim
Or the tires are severely deformed due to loading storage etc.
If available, fill the tire and rim assembly with the normal internal pressure
And leave it for more than 24 hours, or it will be more deformed
And if you ca n’t get away, it ’s a few dozen kilometers more
After running the tire, it is not 5% of the normal internal pressure again
The tire is self-supporting when exhausted until it is equal to 7%
The shape in the state can be a reference shape. The tire and tire are indicated by broken lines in FIGS.
When the internal pressure is charged to the rim assembly
Carcass line 1 'and tire contour 2'
And here, of the deformed shape of the tire by filling the regular internal pressure,
The features of the present invention are clear, especially in this point
The same in the comparative tire of the so-called natural equilibrium shape according to
11 and 12 which show the state of various deformations.
More clear. FIGS. 3 to 6 and FIGS. 7 to 10 show FIGS.
W / T tire and T / L tire according to the present invention as well
The applicable rim is narrower than the standard rim or
Regarding the tire and rim assembly mounted on the standard rim,
The line is filled with a micro pressure equivalent to 5% of the normal internal pressure.
Tire radiation in the standard configuration of the tire and rim assembly
It is a right half or left half cross section in each direction, with no load in each figure.
Tire carcass line C in the state
The normative tire contours are shown by simplified illustrations. First, referring to FIG. 3 to FIG.
The maximum height of the carcass line C from the rim diameter line RL
Represented by symbol H, radial direction from rim diameter line RL
With a maximum height H outward. At a distance LH equivalent to 55 times
A straight line jj 'parallel to the tire rotation axis (not shown)
Radial tangent m passing through the maximum width position of the focus line C
The point where m ′ intersects is defined as the intersection point I, and from the tire equatorial plane M
0.5 times the width W of the narrow rim outward in the tire rotation axis direction
With respect to the vertical line qq 'standing on the rim diameter line RL
Intersect the intersection of carcass lines C in order from the radially inner side
Point J and intersection K are defined. At this time, the distance between the intersection J and the intersection K
The carcass line C is as follows: (1) The tire is applied to the line JI connecting the intersection J
(2) It passes through the intersection K and touches the above tangent line mm 'at the intersection I
Be separated from the arc KI outside the tire of the arc KI.
(3) Contact point A between carcass line C and tangent line mm '
Is separated radially outward with respect to the intersection point I,
Points that satisfy the relative relative positional relationship of the three points
J, consisting of a compound curve that smoothly connects points A and K
And require. The example of the tire shown in FIG.
A reference line (line
Having a carcass line C that substantially matches
In the area above the surface and sidewalls, the reference line (arc KI)
With carcass line C which is markedly separated to the outside of the tire
I do. On the other hand, in the tire examples shown in FIGS.
Carcass line of conventional tires above the dwall
And the reference line (arc KI) is small.
It can be seen that it represents the carcass shape of conventional tires
On the other hand, the reference line (line J
Carcass ply which is markedly separated from the tire by I)
C. The example of the tire shown in FIG.
With a carcass line C located approximately in the middle of
It is clear from the comparison of the drawings that there is something. FIGS. 3 and 5 show actual separation distances.
Rim bead seam that engages the tire bead as shown in
Is about 5 ° to the axis of rotation of the tire.
Rim, that is, a tire (W
/ T tire), the line segment JI and the carcass line C
The maximum separation distance v between 0 and (240 / H) × v <3.5 in relation to the maximum height H, and the maximum of the carcass line C separated from the arc KI.
The distance w satisfies 4.0 <(240 / H) × w <9.5 in relation to the maximum height H, and the contact point A is radially outside the intersection point I.
Distance x to the relation with the maximum height H satisfies 15.0 <(240 / H) × x <35.0
And Further, the tire bead shown in FIGS.
The bead seat on the rim that engages the bead
A rim having an angle of about 15 ° to the
For tires (T / L tires) with
The maximum separation distance v between the minute JI and the carcass line C is
0 ≦ (210 / H) × v <5.0 in relation to the maximum height H, the maximum of the carcass line C separated from the arc KI
The distance w satisfies 2.0 <(210 / H) × w <8.0 in relation to the maximum height H, and the contact point A is radially outside the intersection point I.
Distance x with respect to the maximum height H, 6.0 <(210 / H) × x <30.0.
I do. Next, referring to FIG. 7 to FIG.
Height of carcass line C from rim diameter line RL
In the radial direction from the rim diameter line RL.
A distance LH corresponding to 0.55 times the maximum height H outwards
Straight line jj 'parallel to the tire rotation axis (not shown)
And the radial direction passing through the maximum width position of the carcass line C
A point where the tangent line mm 'intersects is defined as an intersection point I, and a rim diameter line R
Equivalent to 0.3 times the maximum height H from L to the radial direction outward
Straight line k parallel to the rim diameter line RL at a distance MH
k 'crosses the carcass line C in the lower area of the sidewall
Is determined as the intersection R, and the tire rotation from the tire equatorial plane M
To the outside in the axis of rotation, at a distance of 0.5 times the width W of the narrow rim.
The vertical line qq 'on the rim diameter line RL is the sidewall
The point where the carcass line C intersects in the upper region is defined as the intersection K.
You. At this time, the distance between the intersection R and the intersection K is extended.
The carcass line C that passes is:
(5) It passes through the intersection K and comes into contact with the tangent line mm 'at the intersection I.
(6) A contact point A between the carcass line C and the tangent line mm '
Is separated radially outward with respect to the intersection point I,
Points that satisfy the relative relative positional relationship of the three points
R, a point A, and a point K
And require. The tire examples shown in FIGS.
In the area above the dwall, the same
The difference between the carcass line and the reference line (arc KI) is small,
This reference line almost represents the carcass shape of the conventional tire.
Can be seen. Also from the lower area of the sidewall
The carcass shape over the bead portion is also shown in FIGS.
As is clear from comparison with the tire example,
(Arc IR) has a shape that is far away from
Absent. In the bead portion of the tire shown in FIGS.
The rim bead seat that engages with the tire rotation axis
A rim with an angle of about 5 °, i.e.
In the tire (W / T tire) used as the rim for the
The maximum distance y of the carcass line C separated from R is
6.0 <(240 / H) × y <11.5 in relation to the maximum height H, the maximum of the carcass line C separated from the arc KI
The distance w satisfies 4.0 <(240 / H) × w <9.5 in relation to the maximum height H, and the contact point A is radially outside the intersection point I.
Distance x to the relation with the maximum height H satisfies 15.0 <(240 / H) × x <35.0
And The bead portion of the tire shown in FIGS. 8 and 10
The bead seat of the rim that engages with the tire rotation axis
Rim with an angle of about 15 °
Tires (T / L tires) with
Maximum distance of carcass line C separated from arc IR
y satisfies 3.0 <(210 / H) × y <8.0 in relation to the maximum height H, and the maximum of the carcass line C separated from the arc KI.
The distance w satisfies 2.0 <(210 / H) × w <8.0 in relation to the maximum height H, and the contact point A is radially outside the intersection point I.
Distance x with respect to the maximum height H, 6.0 <(210 / H) × x <30.0.
I do. Each minimum value in the range of the distances w and x described above.
And the value that deviates from the maximum value in the range of the distance v
As described above, a sufficient shape change can be obtained when filling with normal internal pressure.
Absent. Also, it should be from the maximum value in the range of the distance w, x
At the specified value, the deformation during filling of normal internal pressure is too large,
And the durability is rather reduced. Tire provided with the above-mentioned carcass line C
When the regular internal pressure is applied to the assembly of
2, from the tire maximum width position 6 to the carcass line
C and the normal limb n on the lower rim
Carcass line C from point 8 where the tire surface touches the lunge
Sideways extending between two points with the normal n '
The shape of the carcass line C in the lower region 9 of the
In the case of 5% micro-pressure filling, it is clear from FIGS.
A curve or straight line with a center of curvature inside the tire
It is misplaced. The carcass line C according to the present invention described above
For tires with
By filling the internal pressure, one end 4 (the other
(The end is not shown.)
At the tread 5 reaching the other end of the ground width,
Tires while producing a substantially uniform bulging g radially outwards
From the end 4 of the contact width, the tire
In the upper area 7 of the sidewall up to the large position 6,
At least a part of the tire is a part indicated by a symbol c in the figure.
Shift d inward in the axial direction of
Below the sidewall up to the point of contact 8 with the rim flange
In the area 9, the overhang f of the tire in the axial direction also occurs.
You. As a result, tires that roll under load
The uniform bulging g at the pad portion 5 causes a large
Initial tension acts on the tread so that it
The compression of the belt is reduced and the shear stress between the cord layers of the belt is reduced.
Reduces bleeding, improves belt durability and simultaneously slips in
Near the folded ply end of the carcass due to the protrusion d and the overhang f
A radially inward compression force on the
Since the initial tension of rubber near the ply end is reduced,
Near the edge of the ply located directly below or near the weight
Reduced amount of skewing and durability of folded back ply end of carcass
Property, that is, bead portion durability is improved. Like this
Advantageously improves belt durability and bead durability at the same time
It can be achieved. Preferably, the crown of the tread 5
The swelling g of the entire area is within the range of 0.5 to 4.0 mm.
The shift d in the upper region 7 of the sidewall is
Within the range of 0.5-4.0 mm, and
The overhang f of the lower area 9 is within the range of 3 to 12 mm.
You. 1 and 2, the tire and rim assembly
Side between filling with low pressure and filling with regular internal pressure
Of the cross-sectional contour before and after the dent deformation of the upper region 7 of the wall
Table of parts of contact or intersection extending between points F and G
The surface length c is at least 20 mm. Further, referring to FIGS.
Measured from the tire maximum width position 6
The radial distance h to the point G in the upper region 7 of the wall.
Is 0.15 of the maximum tire height SH when filling with regular internal pressure
And the carcass ply folded end height HE is
It is the present invention that 10 to 35% of the maximum ear height SH is used.
Complies with Before and after such normal internal pressure filling
Deformation and tread part of upper part 7 of sidewall part
5 bulge and overhang in the lower region 9 of the sidewall
The characteristic shape change according to the present invention that results in the shape
By filling the internal pressure, the tire as a whole expands, and the carcass shape (carcass line C) is naturally balanced
If you use a substantially inextensible cord for the carcass cord,
The carcass does not stretch much, and the deformation due to the filling of the carcass with normal internal pressure is
It occurs in a chain from the red part to the bead part, and
It has the general property that it does not cause deformation
It was used as is. More specifically, the present invention is realized.
For this reason, after filling the rim, apply 5% of normal internal pressure
Each carcass shape as described above
Therefore, it is easy to obtain a shape change unique to the present invention.
You. [0047] The power at the time of filling the minute pressure equivalent to 5% of the normal internal pressure is
Engage with the bead part of the tire due to the definition of the carcass shape
Wide width where the bead seat of the rim forms an angle of about 5 ° with the rotation axis
W / T tires with a flat bottom rim and an angle of about 15mm
T / L tires with 15mm deep rims
Is simply the radial height of the flanges on both rims.
Are different, the rotation axis or rim diameter line RL
The actual value of the distance from the tire to each reference point is different
Origins of the invention idea are the same. Here, a natural equilibrium shape curve (hereinafter, equilibrium shape curve)
N is a so-called equilibrium shape (hereinafter referred to as an equilibrium shape).
According to the theory, Of the equilibrium shape curves represented by
Point B, point whose position can be determined from the maximum height H and the rim width
D and equilibrium through maximum width (determined by standards etc.)
The shape curve N is used as a reference line, and is indicated by a broken line in FIGS.
Was. In this case, the height of point B is (0.15 to 0.30) · H and point D
The height will occupy (0.82-0.98) · H. Using the equilibrium shape curve N as a reference line,
The tire having the carcass line C removed is also described above.
The same effect as the tire according to the present invention can be obtained.
You. This will be described below. FIGS. 15 and 16 show a balanced carcass line.
5% normal internal pressure after rim assembly of conventional tires
Carcass in radial section when pressure is applied
Pass through the profile (solid line) and points B and D,
Equilibrium shape curve N tangent to the radial tangent mm '
(Broken line). The solid line and the dashed line match well,
Conventional tire shapes are designed based on equilibrium shape curves.
You can see that 5 mm For tires using wide flat bottom rims
In reference to FIG.
The carcass line and remove the car
When the maximum distance t between the scum and the equilibrium shape curve N is within the range of 2.0 <(240 / H) × t <10.0, the tire passes through the equilibrium shape curve N,
Greater curvature than conventional tires in the upper region of the wheel
For maximum width A of carcass profile and equilibrium shape curve
The point A is outside the point E in the tire radial direction when the distance u of the maximum width height E of the line is in the range of 5.0 <(240 / H) × u <25.0. to this
Fill more regular internal pressure,
Deformation, crown and side wall when filling with regular internal pressure
To allow sufficient expansion and deformation with the lower region of the
And the carcass line below the sidewall
And the maximum distance s of the equilibrium shape curve is within the range of 5.0 <240 / H × s <13.0, and the carcass line passes inside the tire of the equilibrium shape curve.
By trying to approach the equilibrium shape when filling with normal internal pressure
Sufficient deformation is obtained, resulting in improved durability. 15 ゜ For tires using deep rims
With reference to FIG.
The carcass line above the sidewall
The maximum distance t between the tire and the equilibrium shape curve passes through the outside of the equilibrium shape tire in the range of 1.0 <(210 / H) × t <5.0,
Greater curvature than conventional tires in the upper region of the wheel
For maximum width and height position A of carcass profile
The position A is located radially outside the position E in the tire radial direction when the distance u of the maximum width height position E is in the range of 5.0 <(210 / H) × u <25.0. This
This fills the lower area of the sidewall when filling at normal internal pressure.
Swelling deformation is possible.
In the lower region, the maximum distance between the carcass line and the equilibrium shape curve
s is set in the range of 3.0 <(210 / H) × s <9.0, and the carcass line passes through the inside of the tire of the equilibrium shape curve.
In order to approach the equilibrium shape when filling at normal internal pressure.
Deformation is sufficiently obtained, and the durability is improved. Each minimum value in the range of t, s, u described above
If the value deviates from the specified value, it will be
No improvement in durability can be expected because no proper shape change can be obtained
No. Also, the deviation from the maximum value in the range of t, s, u
Value is too large when filling at normal internal pressure
, The shear strain increases, and the durability decreases on the contrary. After the tire is assembled on the rim,
Carcass line with standard condition filled with 5% micro pressure
In the tread part 5, the power after filling the internal pressure of the equilibrium shape curve
On the inside of the tire from the focus line and on the sidewall
In region 7, the curvature is larger than the curvature of the equilibrium shape after filling the internal pressure.
Set it to the outside of the tire with a curvature, and
The carcass shape from the lower zone 9 to the bead is flat.
Set inside the tire larger than after filling the internal pressure
In addition, steel cord or aromatic polyamide
Using a substantially inextensible cord such as for the carcass ply
By filling the internal pressure,
Dent the carcass and expand the crown area in a chain
Large bulges and large deformation under the sidewalls
Can be done. For example, the upper region 7 of the sidewall has an equilibrium shape.
If the carcass is close to
Is virtually undeformed and required in the crown area
The amount of swelling and the large amount of overhang of the lower region 9 of the sidewall
Cannot be obtained, and the strain distribution necessary for improving durability can be realized.
I can't. Generally, most tire failures are caused by
Frequently occurs at the end A, that is, at the bead portion. Bead part carka
To improve the failure that occurs at the splice end,
By applying moderate compressive stress to the part under the internal pressure,
Prevents ply end failure and improves bead durability
It was clarified that it could be done. In other words, for normal internal pressure filling
Therefore, the axis in the lower side wall area 9 as described above
When the overhang f is generated outward in the direction, as shown in FIG.
In particular, the ply end e of the carcass should be within the range of about 10 to 20 mm.
With the movement to the outside in the axial direction and the inside in the radial direction,
Also, the vicinity of the carcass ply end e is within the radial direction as indicated by the broken line.
Side, the radially inward compression force is covered.
It can be applied to the edge ply end e '. In order to apply an appropriate compressive force here,
Then, assemble the tire and apply 5% of normal internal pressure
The car corresponding to the lower wall 9
Whether the center of the radius of curvature of the scum is inside the tire or
It is recommended that the carcass shape be close to a straight line.
You. The crown area, especially the maximum contact width from the equator
Bulge by filling the internal pressure to the end of
Thus, the belt tension increases. Increase in belt tension
Greatly contributes to improving the durability of the belt end,
The belt that occurs when a load is applied to the tire
Reduces the strain between the layers, which is
This is effective in preventing separation. That is, when the initial tension of the belt is large,
Figure shows the deformation behavior of the belt that occurs when a load is applied to the ear
As shown by the solid arc in Fig. 18, the belt with low initial tension
The center 0 is smaller than the center 0 '
Occupies a high position and therefore the belt deformation on the ground contact side
The amount of deformation in the region R is small, so that at least the belt
Between code cross layers with the code layer having the largest width
Reduced shear strain leads to improved belt edge durability
It is. The tire strain distribution described above is
Provided by the unique chain deformation behavior of the balance
This improves the durability of the round part and bead part.
You. EXAMPLES Examples according to the present invention, including experimental examples, will be described.
This will be described in detail below. [0061] Example 1 Tire size: 10.00 R 20 Rim size: 7.50 V 20 (5 mm wide flat bottom rim) Regular internal pressure: 7.25 kg / cm ^Two As shown in Fig. 3 as a truck / bus tire with a maximum carcass height H: 240 mm
At point I 132mm (0.55 · H), point J height 68.5
mm (0.29 · H), K point height 221mm (0.92 · H)
The relation to the carcass line C is v = 0 mm, w = 7.8 m
m, x = 23.9 mm, and as shown in FIG.
D = 1.3 mm, f = 6.7 mm, g = 2.0 mm, h = 27 mm,
Steel radial tire with c = 75.8mm and HE = 67mm
Prototype made. It is stored in. [0062] Comparative Example 1 Tire size: 10.00 R 20 Rim size: 7.50 V 20 (5 mm wide flat bottom rim) Regular internal pressure: 7.25 kg / cm ^Two As shown in Fig. 5 as a truck / bus tire with a maximum carcass height H: 240 mm
At point I height 132mm (0.55 · H), J point height 68.5mm
(0.27 · H), K point height 221.0 mm (0.90 · H)
The relation to the carcass line C 'is v = 4.3 mm, w = 3.
0 mm and x = 9.3 mm, as shown in FIG.
Steel radius showing uniform bulging deformation of natural equilibrium shape
Tires for comparison. And the pass line of the carcass line C according to the present invention.
Is far away from. [0063] Example 2 Tire size: 7.50 R 16 Rim size: 6.00 GS 16 (5 mm wide flat bottom rim) Regular internal pressure: 7.0 kg / cm ^Two For truck / bus tires with a maximum carcass height of H = 178 mm, as shown in FIG.
, I point height 97.9mm (0.55 · H), J point height 55.0
mm (0.31 · H), K point height 161.0 mm (0.9 · H)
V = 0 mm, w = 3.4
mm, x = 16.8 mm, and as shown in FIG.
= 0.8 mm, f = 5.5 mm, g = 1.2 mm
Prototype of Altire. [0064] Comparative Example 2 Tire size: 7.50 R 16 Rim size: 6.00 GS 16 (5 mm wide flat bottom rim) Regular internal pressure: 7.0 kg / cm ^Two As shown in Figure 3 as a truck / bus tire with a maximum carcass height of 178 mm
At point I, height 97.9mm (0.55 · H), point J, height 55.2
mm (0.28 · H), K point height 161.0 mm (0.85 · H)
V = 4.8 mm, w =
0.9 mm, x = 4.8 mm, conventional as shown in FIG.
Steel radial tires with natural balance
Trolled for comparison. [0065] Example 3 Tire size: 10.00 R 20 Rim size: 7.50 V 20 (5 mm wide flat bottom rim) Regular internal pressure: 7.25 kg / cm ^Two As shown in Fig. 3 as a truck / bus tire with a maximum carcass height H: 241.5 mm
At point I, height 132.8 mm (0.55 · H), point J, height 57.
5mm (0.24 · H), K point height 224 mm (0.93 · H)
For carcass line C, v = 0 mm, w = 7.5 mm, x =
28.5 mm, and d = 1.
5 mm, f = 6.5 mm, g = 1.8 mm steel radial
A prototype tire was made. [0066] Comparative Example 3 Tire size: 10.00 R 20 Rim size: 7.50 V 20 (5 mm wide flat bottom rim) Regular internal pressure: 7.25 kg / cm ^Two As shown in Fig. 5 as a truck / bus tire with a maximum carcass height H: 241.5 mm
, I point height 132.8 mm (0.55 · H), J point height 5
7.5mm (0.24 ・ H), K point height 224.0mm (0.93 ・ H)
The relation to the determined carcass line C 'is v = 4.5 m
m, w = 3.8 mm, x = 3.8 mm, as shown in FIG.
Steel radial tire with natural equilibrium shape as before
Was used for comparison as a control. The increase in belt tension affects the durability of the belt end.
The result of a comparison test to see how much
It is as follows. Test condition: Drum test with slip angle, positive
Slip angle 3 with normal internal pressure and twice the normal load
° was added and the speed was 60 km / hr. Result: Example 1 is 865km, Example 2 is 812km and Example
3 traveled 840km with a slight separation at the end of the belt
there were. Comparative Example 1 is 630 km, Comparative Example 2 is 673 km, Comparative Example
3 has a separation at the belt edge at each run of 600 km
Next, to check the durability of the bead,
The test was performed on a test machine. Test conditions: normal internal pressure, normal load, twice the load, speed
Degree 60km / h Result: Example 1 and Example 2 were 19450 km, 19000 km
A slight separation occurred at the ply end during running
However, in Example 3, there was no abnormality after completing 20,000 km
Was. Comparative Example 1 was 14500 km, 2 was 15700 km and 3 was 15
At 000 km, separation occurred. [0069] Example 4 Tire size: 11/70 R 22.5 Rim size: 8.25 x 22.5 (15 mm deep rim) Regular internal pressure: 8.0 kg / cm ^Two As shown in Fig. 4 as a truck / bus tire with a maximum carcass height H: 167.2 mm
At point I, height 92.1mm (0.55 · H), point J, height 44.3
mm (0.26 · H), K point height 146mm (0.88 · H)
The relation to carcass line C is v = 2.5 mm, w = 3.0
mm, x = 15.4 mm, and as shown in FIG.
D = 1.1 mm, f = 4.2 mm, g = 1.7 mm, h = 13.2 m
m, c = 41mm, HE = 19mm steel radial tire
Was prototyped. In this case, (210 / H) × v ≒ 3.14 in the range of 0 to 5.0 (210 / H) × w ≒ 3.77 in the range of 2.0 to 8.0 (210 / H) × x ≒ 19.3 in the range of 6.0 to 30.0 Inside. [0070] Comparative Example 4 Tire size: 11/70 R 22.5 Rim size: 8.25 x 22.5 (15 mm deep rim) Regular internal pressure: 8.0 kg / cm ^Two Fig. 6 shows a truck / bus tire with a maximum carcass height H of 166.0 mm.
In the above, I point height 91.3mm (0.55H), J point height 44.0
mm (0.27 · H), K point height 146.4 mm (0.88 · H)
V = 6.3 mm, w =
1.2 mm, x = 2.8 mm, as shown in FIG.
Steel radial tires with natural balance
Troll 1 was used for comparison. And the pass line of the carcass line C according to the present invention.
Is far away from. [0071] Example 5 Tire size: 285/75 R 24.5 Rim size: 8.25 × 24.5 (15 mm deep rim) Regular internal pressure: 8.2 kg / cm ^Two For truck and bus tires with a maximum carcass height of H = 183 mm, as shown in FIG.
At point I, height 100.7 mm (0.55 · H), point J height 4
9.0mm (0.27 • H), K point height 165.5mm (0.91 • H)
The relation to the determined carcass line C is v = 2.0 mm, w
= 3.7 mm, x = 18.0 mm, and as shown in FIG.
And d = 2.5 mm, f = 8.0 mm, g = 1.8 mm
Prototype of radial tire. [0072] Comparative Example 5 Tire size: 285/75 R 24.5 Rim size: 8.25 × 24.5 (15 mm deep rim) Regular internal pressure: 8.2 kg / cm ^Two As shown in Fig. 6 as a truck / bus tire with a maximum carcass height of 183 mm
At point I, height 100.7 mm (0.55 · H), point J height 4
9.0mm (0.27 ・ H), K point height 166.8mm (0.91 ・ H)
The relation to the determined carcass line C ′ is v = 5.0 mm,
w = 0.8 mm, x = 4.0 mm, and
Steel radial tires with natural equilibrium shape
For comparison. [0073] Example 6 Tire size: 11 R 22.5 Rim size: 8.25 x 22.5 (15 mm deep rim) Regular internal pressure: 7.0 kg / cm ^Two As shown in FIG. 4 as a truck / bus tire having a maximum carcass height H: 210 mm.
At point I, height 115.5 mm (0.55 · H), point J height 5
4.5mm (0.30 ・ H), K point height 181.0mm (0.86 ・ H)
With respect to the determined carcass line C, v = 2.9 mm, w = 3.8
mm, x = 16.7 mm, and as shown in FIG.
And d = 1.2 mm, f = 7.5 mm, g = 1.7 mm
Prototype of radial tire. [0074] Comparative Example 6 Tire size: 11 R 22.5 Rim size: 8.25 x 22.5 (15 mm deep rim) Regular internal pressure: 7.0 kg / cm ^Two As shown in FIG. 6 as a truck / bus tire having a maximum carcass height H = 210 mm.
At point I, height 115.5 mm (0.55 · H), point J height 5
4.5mm (0.26 ・ H), K point height 180.7mm (0.86 ・ H)
The relation to the determined carcass line C ′ is v = 5.8 m
m, w = 1.2 mm, x = 5.0 mm, as shown in FIG.
Steel radial tie with natural equilibrium shape as before
For comparison. The increase in belt tension affects the durability of the belt end.
The result of a comparison test to see how much
It is as follows. Test condition: Drum test with slip angle, positive
Slip angle 3 with normal internal pressure and twice the normal load
° was added and the speed was set to 60 km / hr. Result: Example 4 is 803 km, Example 5 is 815 km and Example
6 is 833km with a slight separation at the end of the belt
Living. Comparative Example 4 is 605 km, Comparative Example 5 is 645 km, and Comparative Example 6 is
Separation at the end of belt at each run of 592 km
Living. Next, to examine the durability of the bead portion,
The test was performed on a test machine. Test conditions: normal internal pressure, normal load, twice the load, speed
Degree 60km / h Result: Example 4 and Example 5 run at 18500 km and 19200 km
Example where slight separation occurs at the ply end at the line
In 6, the vehicle completed 20,000 km without any abnormality. Comparative example
4 run 14200 km, 5 run 16500 km and 6 run 15900 km
In the row, a separation occurred. [0077] Example 7 Tire size: 10.00 R 20 Rim size: 7.50 V 20 (5 mm wide flat bottom rim) Regular internal pressure: 7.25 kg / cm ^Two Carcass maximum height H: 242mm as shown in Fig. 7 for truck and bus tires
At point I, height 133.1mm (0.55 · H), point R height 7
2.6mm (0.30 ・ H), K point height 220mm (0.91 ・ H)
The relationship with respect to the carcass line C is y = 10.0 mm, w = 7.
8 mm, x = 23.9 mm, and as shown in FIG.
D = 1.3 mm, f = 6.7 mm, g = 2.0 mm, h = 27.0 m
m, c = 75.0mm, HE = 67.1mm steel radial
Prototype ears. It is stored in. [0078] Comparative Example 7 Tire size: 10.00 R 20 Rim size: 7.50 V 20 (5 mm wide flat bottom rim) Regular internal pressure: 7.25 kg / cm ^Two Fig. 9 shows the maximum carcass height H: 242mm for truck and bus tires.
At point I, height 133.1mm (0.55H), point R, height 72.4mm
(0.30 · H), K point height 219 mm (0.90 · H)
The relation to the carcass line C 'is y = 4.4 mm, w = 3.
0 mm, x = 9.3 mm, as shown in FIG.
Control of natural radial steel tires with cages
Roll 1 was used for comparison. And the pass line of the carcass line C according to the present invention.
Is far away from. [0079] Example 8 Tire size: 7.50 R 16 Rim size: 600 GS 16 (5 ° wide flat bottom rim) Regular internal pressure: 7.0 kg / cm ^Two For truck and bus tires with a maximum carcass height of H = 178 mm, as shown in FIG.
In the above, I point height 97.9mm (0.55 · H), R point height 53.4
mm (0.30 · H), K point height 162.5mm (0.91 · H)
The relationship with respect to the carcass line C is y = 5.5 mm, w = 3.
4 mm, x = 16.8 mm, and as shown in FIG.
Steel stirrer with d = 2.8 mm, f = 5.1 mm, g = 1.0 mm
A trial tire was made. [0080] Comparative Example 8 Tire size: 7.50 R 16 Rim size: 600 GS 16 (5 mm wide flat bottom rim) Regular internal pressure: 7.0 kg / cm ^Two As shown in Fig. 9 as a truck / bus tire with a maximum carcass height of 178 mm
At point I, height 97.9mm (0.55H), point R height 53.4
mm (0.30 · H), K point height 162.5 mm (0.91 · H)
The relationship with respect to the carcass line C ′ is y = 0.8 mm, w =
0.9 mm, x = 4.8 mm, conventional as shown in FIG.
Steel radial tires with natural balance
It was used as a troll for comparison. [0081] Example 9 Tire size: 10.00 R 20 Rim size: 7.50 V 20 (5 mm wide flat bottom rim) Regular internal pressure: 7.25 kg / cm ^Two As shown in Fig. 7 as a truck / bus tire with a maximum carcass height H: 241 mm
At point I, height 132.6 mm (0.55 · H), point R height 7
2.3mm (0.30 ・ H), K point height 226mm (0.94 ・ H)
For the determined carcass line C, y = 9.8 mm, w = 6.5
mm, x = 23.5 mm, and as shown in FIG.
And d = 1.5 mm, f = 5.0 mm, g = 1.8 mm
Prototype of radial tire. [0082] Comparative Example 9 Tire size: 10.00 R 20 Rim size: 7.50 V 20 (5 mm wide flat bottom rim) Regular internal pressure: 7.25 kg / cm ^Two As shown in FIG. 9 as a truck / bus tire having a maximum carcass height H = 241 mm.
At point I, height 132.6 mm (0.55 · H), point R height 7
2.0mm (0.3 · H), K point height 226.5 mm (0.94 · H)
The relation to the carcass line C ′ defined in
mm, w = 3.8 mm, x = 3.8 mm, as shown in FIG.
Steel radial tie with natural equilibrium shape as before
For comparison. The increase in belt tension affects the durability of the belt end.
The result of a comparison test to see how much
It is as follows. Test condition: Drum test with slip angle, positive
Slip angle 3 with normal internal pressure and twice the normal load
° was added and the speed was 60 km / hr. Result: Example 7 is 890km, Example 8 is 802km and Example
9 is 851 km with a slight separation at the end of the belt
Was. Comparative Example 7 is 585 km, Comparative Example 8 is 640 km, Comparative Example 9 is
Separation at the end of the belt at each run of 612 km
Living. Next, to examine the durability of the bead portion,
The test was performed on a test machine. Test conditions: normal internal pressure, normal load, twice the load, speed
Degree 60km / h Result: Example 7 and Example 9 run at 18500 km and 19000 km
Example where slight separation occurs at the ply end at the line
In 8, the vehicle completed 20,000 km without any abnormality. Comparative example
7 was 14900 km, 8 was 16000 km and 9 was 15550 km
In the row, a separation occurred. [0085] Example 10 Tire size: 11/70 R 22.5 Rim size: 8.25 x 22.5 (15 mm deep rim) Regular internal pressure: 8.0 kg / cm ^Two As shown in Fig. 8 as a truck / bus tire with a maximum carcass height H of 168.2 mm
In the above, I point height 92.5mm (0.55 ・ H), R point height 50.5
mm (0.30 · H), K point height 148mm (0.88 · H)
The relationship to the focus line C is y = 4.8 mm, w = 3.0 mm
, X = 15.4 mm, and as shown in FIG.
D = 1.1 mm, f = 4.2 mm, g = 1.7 mm, h = 13.2 m
m, c = 41mm, HE = 19mm steel radial tie
Ya prototype. In this case, (210 / H) × y ≒ 5.99 in the range of 3.0 to 8.0 (210 / H) × w ≒ 3.75 in the range of 2.0 to 8.0 (210 / H) × x ≒ 19.22 in the range of 6.0 to 30.0 Inside. [0086] Comparative Example 10 Tire size: 11/70 R 22.5 Rim size: 8.25 x 22.5 (15 mm deep bottom rim) Regular internal pressure: 8.0 kg / cm ^Two The tire shown in Fig. 10 is used as a truck / bus tire with a maximum carcass height H: 167.5 mm.
In the filter, I point height 92.1mm (0.55 ・ H), R point height 50.3
mm (0.3 · H), K point height 147.8 mm (0.9 · H)
The relation to the carcass line C 'is y = 2.0 mm, w = 1.
2 mm, x = 2.8 mm, as shown in FIG.
Control of natural radial steel radial tires
For comparison. And the pass line of the carcass line C according to the present invention.
Is far away from. [0087] Example 11 Tire size: 285/75 R 24.5 Rim size: 8.25 × 24.5 (15 mm deep rim) Regular internal pressure: 8.2 kg / cm ^Two For truck and bus tires with a maximum carcass height of H = 183 mm, as shown in FIG.
At point I, height 100.7 mm (0.55 · H), point R height 5
4.9mm (0.30 ・ H), K point height 165.5mm (0.90 ・ H)
The relation to the determined carcass line C is y = 5.1 mm, w
= 3.7 mm, x = 18.3 mm, and as shown in FIG.
And d = 2.5 mm, f = 7.3 mm, g = 1.8 mm
Prototype of radial tire. [0088] Comparative Example 11 Tire size: 285/75 R 24.5 Rim size: 8.25 × 24.5 (15 mm deep rim) Regular internal pressure: 8.2 kg / cm ^Two Carcass maximum height: 183 mm for truck and bus tires as shown in Fig. 10
In the filter, I point height 100.7 mm (0.55 · H), R point height
54.9mm (0.30 ・ H), K point height 165.1mm (0.90 ・ H)
The relation to the determined carcass line C ′ is y = 1.9 mm,
w = 0.8 mm, x = 4.0 mm, as shown in FIG.
Steel radial tires with natural equilibrium shape as before
Control was used for comparison. [0089] Example 12 Tire size: 11 R 22.5 Rim size: 8.25 x 22.5 (15 mm deep rim) Regular internal pressure: 8.0 kg / cm ^Two As shown in Fig. 8 as a truck / bus tire with a maximum carcass height H: 210 mm
At point I, height 115.5 mm (0.55 · H), point R height 5
4.9mm (0.30 ・ H), K point height 181.0mm (0.86 ・ H)
With respect to the determined carcass line C, y = 4.9 mm, w = 3.8
mm, x = 16.7 mm, and as shown in FIG.
And d = 1.2 mm, f = 7.5 mm, g = 1.7 mm
Prototype of radial tire. [0090] Comparative Example 12 Tire size: 11 R 22.5 Rim size: 8.25 x 22.5 (15 mm deep rim) Regular internal pressure: 8.0 kg / cm ^Two Carcass maximum height H = 210 mm As shown in FIG.
In the filter, I point height 115.5 mm (0.55 · H), R point height
54.5mm (0.31 ・ H), K point height 181.4mm (0.86 ・ H)
The relation to the determined carcass line C 'is y = 1.8 m
m, w = 1.2 mm, x = 4.4 mm, as shown in FIG.
Steel radial tie with natural equilibrium shape as before
For comparison. The increase in belt tension affects the durability of the belt end.
The result of a comparison test to see how much
It is as follows. Test condition: Drum test with slip angle, positive
Slip angle 3 with normal internal pressure and twice the normal load
° was added and the speed was 60 km / hr. Result: Example 10 is 865 km, Example 11 is 802 km and actual
Example 12 is 845km with a slight separation at the end of the belt
Occurred. Comparative Example 10 is 620 km, Comparative Example 11 is 629 km,
Comparative Example 12 separates the belt edge at each point of 598 km running.
Occurs. Next, to examine the durability of the bead portion,
The test was performed on a test machine. Test conditions: normal internal pressure, normal load, twice the load, speed
Degree 60km / h Result: Example 10 and Example 11 were 18500 km, 18550 km
The slight separation at the end of the ply
In Example 12, there was no abnormality after completing 20,000 km.
Comparative Example 10 is 14200 km, 11 is 15950 km and 12 is
At 16050 km, separation occurred. [0093] Experimental example 1 Tire size: 10.00 R 20 Rim size: 7.50 V 20 (5 mm wide flat bottom rim) Regular internal pressure: 7.25 kg / cm ^Two The tire shown in Fig. 13 is used as a truck / bus tire with a maximum carcass height H: 240 mm.
At point B, height 53.2mm (0.22 · H), point D height 22
For carcass line C set to 6.2 mm (0.94 · H)
The relationships are s = 10.0mm, t = 7.8mm, u = 23.9mm.
As shown in FIG. 1, d = 1.3 mm and f = 6.
7 mm, g = 1.9 mm, h = 26.5 mm, c = 75 mm, HE = 67.2
mm steel radial tires were prototyped. It is stored in. [0094] Comparative Example 1 Tire size: 10.00 R20 Rim size: 7.50V20 (5mm wide flat bottom rim) Regular internal pressure: 7.25kg / cm ^Two The tire shown in Fig. 15 is used as a truck / bus tire with a maximum carcass height H: 240 mm.
B point height 49.0mm (0.20 · H), D point height 224.
2mm (0.91 · H) to the carcass line C '
The relationships are s = 1.5 mm, t = 0.3 mm, u = 0.2 mm,
Uniform expansion of the natural equilibrium shape as shown in FIG.
Steel radial tires exhibiting out-of-deformation were provided for comparison. And the pass line of the carcass line C according to the present invention.
Is far away from. [0095] Experimental example 2 Tire size: 7.50 R 16 Rim size: 600 GS 16 (5 mm wide flat bottom rim) Regular internal pressure: 7.0 kg / cm ^Two For truck and bus tires with a maximum carcass height of H = 178mm,
At point B, height 41.6mm (0.23 · H), point D height 16
6 mm (0.93 · H) for carcass line C
Assuming that s = 4.6 mm, t = 2.8 mm, u = 8.5 mm, and FIG.
Where d = 0.8 mm, f = 5.0 mm, g =
A 1.0 mm steel radial tire was prototyped. [0096] Comparative Example 2 Tire size: 7.50 R 16 Rim size: 600 GS 16 (5 mm wide flat bottom rim) Regular internal pressure: 7.0 kg / cm ^Two As shown in Fig. 15 as a truck / bus tire with a maximum carcass height of 178 mm
At point B, height 41.0mm (0.23 · H), point D height 16
For carcass line C 'set to 6.0 mm (0.91 · H)
S = 1.2 mm, t = 0 mm, u = 0.5 mm
A conventional natural equilibrium shaped steam as shown in FIG.
A radial tire was provided for comparison. [0097] Experimental example 3 Tire size: 10.00 R 20 Rim size: 7.50 V 20 (5 mm wide flat bottom rim) Regular internal pressure: 7.25 kg / cm ^Two The tire shown in Fig. 13 is used as a truck / bus tire with a maximum carcass height H: 241 mm.
At point B, height of point B is 50.0mm (0.21 · H), height of point D is 22
For carcass line C set to 9.7mm (0.95 · H)
S = 7.0mm, t = 5.9mm, u = 16.7mm
In addition, as shown in FIG. 1, d = 1.5 mm, f = 5.0
mm, g = 1.8mm steel radial tire prototype
Was. [0098] Comparative Example 3 Tire size: 10.00 R 20 Rim size: 7.50 V 20 (5 mm wide flat bottom rim) Regular internal pressure: 7.25 kg / cm ^Two As a truck / bus tire having a maximum carcass height H = 240 mm, the tire shown in FIG.
At point B, point B height 50.0mm (0.20 · H), point D height 22
For the carcass line C 'set to 9.5 mm (0.94 · H)
Are s = 3.0 mm, t = 0.9 mm, and u = 2.5 mm.
As shown in FIG.
Using the teal radial tire as a control for comparison
Was. Comparison with the tire of Experimental Example 1 of the above
Of the initial tension of the belt on the radial cross section of the tire for Example 1
FIG. 19 shows the result of the distribution obtained by the finite element method. So
Each tire has four belt layers from the radial inner side
The first belt layer, the second belt layer, the third belt layer, the fourth belt layer
Belt layers, tension of the second and third belt layers
The distribution was determined. In this case, the conditions for measuring the belt tension distribution
Of course, it was filled with normal internal pressure and no load. As is clear from FIG. 19, the tire of Experimental Example 1 was used.
Indicates that the tension in the circumferential direction is higher than Comparative Example 1,
This tendency is related to the relationship between Experimental Examples 2 and 3 and Comparative Examples 2 and 3.
It was the same. The above-described increase in the belt tension is caused by the bell.
Results of a comparative test
The results are as follows. Test condition: Drum test with slip angle, positive
Slip angle 3 with normal internal pressure and twice the normal load
° was added and the speed was set to 60 km / hr. Result: Experimental example 1 was 895 km, Experimental example 2 was 802 km, Experimental example 3
Completed 840 km. Comparative Example 1 was 630 km, Comparative Example 2 was 6
25km, Comparative Example 3 separates the belt edge at each running point of 592km.
Has occurred. Next, to examine the durability of the bead portion,
The test was performed on a test machine. Test conditions: normal internal pressure, normal load, twice the load, speed
Degree 60km / h Result: Test example 1 completed 2000km and no abnormality occurred
However, in Experimental Examples 2 and 3, running at 19800 km and 19500 km, respectively
A slight separation occurred at the ply end. Comparison
Example 1 is 14500 km, 2 is 14450 km and 3 is 15000 km
During the run, a separation occurred. [0103] Experimental example 4 Tire size: 11/70 R 22.5 Rim size: 8.25 x 22.5 (15 mm deep rim) Regular internal pressure: 8.0 kg / cm ^Two As a truck / bus tire having a maximum carcass height H of 166 mm, as shown in FIG.
At point B, height 30.5mm (0.18 ・ H) at point B, height 15 at point D
Carcass line C defined at 7.2 mm (0.94 · H)
The relationships are s = 5.8 mm, t = 1.7 mm, u = 9.0 mm, and
In FIG. 2, d = 1.1 mm and f = 4.2
mm, g = 1.7 mm, h = 13.2 mm, c = 41 mm, HE = 19 mm
Made a steel radial tire. In this case, (210 / H) × s ≒ 7.34 within the range of 3.0 to 9.0 (210 / H) × t ≒ 2.15 within the range of 1.0 to 5.0 (210 / H) × u ≒ 11.39 and the range of 5.0 to 25.0 It is stored in. [0104] Comparative Example 4 Tire size: 11/70 R 22.5 Rim size: 8.25 x 22.5 (15 mm deep rim) Regular internal pressure: 8.0 kg / cm ^Two As a truck / bus tire having a maximum carcass height H: 166 mm, the tire shown in FIG.
30.5mm height (0.18 ・ H) at point B and 157.
For carcass line C 'set to 2 mm (0.94 · H)
The relationships are s = 1.2 mm, t = 0.5 mm, u = −1.0 mm.
As shown in FIG.
Control tires for comparison.
Was. And the pass line of the carcass line C according to the present invention.
Is far away from. [0105] Experimental example 5 Tire size: 285/75 R 24.5 Rim size: 8.25 × 24.5 (15 mm deep rim) Regular internal pressure: 8.2 kg / cm ^Two For truck and bus tires with a maximum carcass height of H = 183 mm,
At point B, point B height 38.8mm (0.21 · H), point D height 17
2.5 mm (0.94 · H) for carcass line C
The relationship is s = 5.0 mm, t = 2.5 mm, u = 9.0 mm, and FIG.
Where d = 2.5 mm, f = 7.3 mm, g
= 1.8 mm steel radial tires were prototyped. [0106] Comparative Example 5 Tire size: 285/75 R 24.5 Rim size: 8.25 x 24.5 (15 mm deep rim) Regular internal pressure: 8.2 kg / cm ^Two As shown in Fig. 16 as a truck / bus tire with a maximum carcass height of 183 mm.
At point B, height 39.0mm (0.21 · H), point D height 17
For carcass line C 'set to 2.2 mm (0.94 · H)
Are s = 1.5 mm, t = 0.0 mm, u = 0.0 mm
As shown in FIG.
Control the teal radial tires for comparison
Was. [0107] Experimental example 6 Tire size: 11 R 22.5 Rim size: 8.25 x 22.5 (15 mm deep rim) Regular internal pressure: 7.0 kg / cm ^Two As a truck / bus tire having a maximum carcass height H: 210 mm, the tire shown in FIG.
At point B, point B height 40.5mm (0.19 · H), point D height 19
For carcass line C set to 0 mm (0.90 · H), s
= 7.0 mm, t = 3.5 mm, u = 12.5 mm
Where shown, d = 1.2 mm, f = 7.5 mm, g = 1.
An 8 mm steel radial tire was prototyped. [0108] Comparative Example 6 Tire size: 11 R 22.5 Rim size: 8.25 x 22.5 (15 mm deep rim) Regular internal pressure: 7.0 kg / cm ^Two As shown in Fig. 16, the maximum carcass height is 210 mm for truck and bus tires.
At point B, point B height 40.5mm (0.19 · H), point D height 19
0.0mm (0.90 · H) for carcass line C '
Are s = 0.8 mm, t = 0.5 mm, and u = 1.8 mm.
As shown in FIG.
Control the teal radial tires for comparison
Was. The increase in belt tension affects the durability of the belt end.
The result of a comparison test to see how much
It is as follows. Test condition: Drum test with slip angle, positive
Slip angle 3 with normal internal pressure and twice the normal load
° was added and the speed was set to 60 km / hr. Result: Experimental example 4 is 806 km, experimental example 5 is 818 km and experimental example
6 ran 828km. Comparative Example 4 was 605 km, and Comparative Example 5 was
640 km and Comparative Example 6 set the belt edge at each running point of 603 km.
A paration has occurred. Next, to examine the durability of the bead portion,
The test was performed on a test machine. Test conditions: normal internal pressure, normal load, twice the load, speed
Degree 60km / h Result: Experimental example 4 is 19,050 km, Experimental examples 5 and 6 are respectively
19300 km, a slight separation at the end of the ply at the line of 19750 km
Solution occurred. Comparative Example 4 was 14500 km, and Comparative Example 4 was 15700 km.
km and 6 are running at 16400 km and separation
I was born. According to the present invention, there is provided the invention as set forth in claims 1 to 12.
Heavy-duty radial tires according to the
This results in a significant improvement in durability at the ends.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a right half cross-sectional view showing a specific shape change occurring in a tire of the present invention. FIG. 2 is a right half cross-sectional view showing the outline of a specific shape change occurring in the tire of the present invention. FIG. 3 is a left half sectional view showing an embodiment of a tire according to the present invention. FIG. 4 is a right half sectional view showing an embodiment of a tire according to the present invention. FIG. 5 is a left half sectional view showing an embodiment of the tire according to the present invention. FIG. 6 is a right half sectional view showing an embodiment of a tire according to the present invention. FIG. 7 is a left half sectional view showing an embodiment of a tire according to the present invention. FIG. 8 is a right half sectional view showing an embodiment of a tire according to the present invention. FIG. 9 is a left half sectional view showing an embodiment of a tire according to the present invention. FIG. 10 is a right half sectional view showing an embodiment of a tire according to the present invention. FIG. 11 is a right half sectional view showing a shape change capacity occurring in a conventional tire. FIG. 12 is a right half sectional view showing a capacity of a shape change occurring in a conventional tire. FIG. 13 is a left half sectional view showing a different embodiment. FIG. 14 is a right half sectional view showing a different embodiment. FIG. 15 is a left half sectional view of a conventional tire. FIG. 16 is a right half sectional view of a conventional tire. FIG. 17 is an explanatory diagram of a deformation behavior of a tire due to internal pressure filling. FIG. 18 is an explanatory diagram of a deformation behavior of a tire due to a load. FIG. 19 is a comparison diagram of a belt tension distribution over a width direction of a tread portion. [Description of Signs] 1, 1 'Carcass Line 2, 2' Tire Outer Profile 4 Tread End 5 Tread 6 Maximum Width 7 Upper Wall 9 Lower Wall

──────────────────────────────────────────────────続 き Continuation of the front page (31) Priority claim number Japanese Patent Application No. 62-263756 (32) Priority date October 21, 1987 (33) Priority claim country Japan (JP) (56) References JP-A-55-11996 (JP, A) JP-A-61-163004 (JP, A) Japanese Patent Publication No. 2-14201 (JP, B2) Japanese Patent Publication No. 1-16680 (JP, B2) (58) (Int.Cl. ⁶ , DB name) B60C 11/00 B60C 13/00 B60C 9/00-9/08

Claims (1)

(57) [Claims] A heavy-duty radial tire comprising at least one ply of a radial carcass using a non-extensible cord extending from one bead portion to the other bead portion, and a belt for reinforcing a tread portion around the outer periphery of the carcass, A carcass ply in a radial cross section of a tire in which a rim narrower than the width of the standard rim or a tire and a rim assembly attached to the standard rim among the applicable rims is filled with a slight pressure equivalent to 5% of a normal internal pressure. Is the maximum height of the carcass line (C) from the rim diameter line (RL) and the radial height from the rim diameter line (RL). A straight line (j) parallel to the tire rotation axis and separated outwardly by a distance (LH) corresponding to 0.55 times the maximum height (H)
j ′) and the intersection of the radial tangent (mm ′) at the maximum width position of the carcass line (C) with the intersection (I), and the width of the narrow rim from the tire equatorial plane (M) outward in the tire rotation axis direction. Rim diameter line (R
The intersection of the carcass line (C) with respect to the perpendicular (qq ′) set up in L) is the intersection (J) in order from inside in the radial direction,
When the intersection (K) is determined, the carcass line (C) extends between the intersection (J) and the intersection (K) with respect to a line (JI) connecting the intersection (J) with the intersection (I). The carcass line (C) is spaced apart from the tire including the overlap, and the carcass line (C) passes through the intersection (K) and contacts the tangent (mm ') at the intersection (I).
I) is separated from the arc (KI) outside the tire, and the contact point (A) between the carcass line (C) and the tangent (mm ') is separated radially outward from the intersection (I). , A complex curve that smoothly connects points (J), points (A) and (K) satisfying the respective relative positional relationships.
A carcass line (C) composed of the composite curve
Normal internal pressure filling from the time of micro pressure filling of ear and rim assembly
Until completion, the entire area of the tread crown is outside the radial direction of the tire
Sideward from the tread contact width end to the tire maximum width position
The upper region of the wall is depressed and deformed toward the inside of the tire.
Saidowo Lumpur lower range up contacts towards the tire outside
A heavy duty radial tire characterized by expanding and deforming . 2. A tire mounted on an applicable rim, wherein a bead seat of a rim engaged with a bead portion of the tire has an angle of about 5 ° with respect to a rotation axis of the tire, wherein the line segment (JI) and the carcass line (C) , The following relationship 0 ≦ (240 / H) × v <3.5 is satisfied with respect to the maximum height (H), and the carcass line is separated from the arc (KI). For the maximum distance (w) of (C), the following relationship 4.0 <(240 / H) × w <9.5 is satisfied with respect to the maximum height (H), and the intersection of the contact point (A) The radially outward separation distance (x) with respect to (I) satisfies the following relationship with respect to the maximum height (H): 15.0 <(240 / H) × x <35.0. tire. 3. A tire mounted on an applicable rim, wherein a bead seat of a rim engaged with a bead portion of the tire has an angle of about 15 ° with respect to the tire rotation axis, wherein a distance between the line segment (JI) and the carcass line (C) is For the maximum separation distance (v), the following relationship 0 ≦ (210 / H) × v <5.0 with respect to the maximum height (H), and the carcass line (C) separated from the arc (KI) ) Satisfies the following relationship with respect to the maximum height (H): 2.0 <(210 / H) × w <8.0, and the intersection (I) of the contact point (A) 2. The tire according to claim 1, wherein the following relationship is satisfied with respect to the maximum height (H): 6.0 <(210 / H) × x <30.0. 4. Regular internal pressure filling for the above tire and rim assembly
Carcass line (C) from the tire maximum width position after
Leg (n) with normal lowered above and franc with narrow rim
On the carcass line (C) from the point where the tire surface touches
Side between two points with the normal foot (n ') lowered to
The shape of the carcass line (C) below the wall is normal
Curvature inside the tire when filling with 5% of internal pressure
2. The method of claim 1, wherein the curve is a curved line or a straight line.
Tires. 5. The above tires with no load on the tires and
From filling the rim assembly with slight pressure to filling with regular internal pressure
From the tread width end to the tread width center
The entire crown area up to the other contact width end is
Radially outward in the range of 0.5 to 4.0 mm
The side from the contact width end of the tread to the tire maximum width position
The upper area of the wall is 0.5-4m toward the inside of the tire
Deforms at the maximum displacement d within the range of m, from the tire maximum width position to the rim flange of the tire surface
The lower area of the sidewall up to the contact points toward the outside of the tire
Expansion deformation at the maximum overhang f within the range of 3 to 12 mm
The tire according to claim 1, wherein the tire is shaped. 6. The above tires with no load on the tires and
From filling the rim assembly with low pressure to filling with regular internal pressure
Before and after the dent deformation in the upper region of the side wall
Point (F) and point (G) of the point of contact or intersection of the surface contour
The tire surface length (c) of the portion extending between them is at least
The tire according to claim 1, which is 20 mm. 7. Folding of carcass ply after filling with regular internal pressure
The height (HE) from the end rim diameter line (RL) is
10 to 35% of the tire maximum height (SH) after filling with internal pressure
The tire according to claim 4, which is within the range of: 8. Measured from tire maximum width position after filling with regular internal pressure
Up to the point (G) above the sidewall
The radial distance (h) of the
Less than 0.15 times the maximum tire height (SH)
Item 7. The tire according to item 6. 9. A heavy-duty radial tire comprising at least one ply of a radial carcass using a non-extensible cord extending from one bead portion to the other bead portion, and a belt for reinforcing a tread portion around the outer periphery of the carcass, A carcass ply in a radial cross section of a tire in which a small rim corresponding to 5% of a normal internal pressure is applied to a tire and a rim assembly mounted on the rim narrower than the standard rim or the standard rim among the applied rims. Is the maximum height of the carcass line (C) from the rim diameter line (RL) and the radial height from the rim diameter line (RL). A straight line (j) parallel to the tire rotation axis and separated outwardly by a distance (LH) corresponding to 0.55 times the maximum height (H)
j ') and the tangent (mm') in the radial direction at the maximum width position of the carcass line (C) to the intersection (I) and the maximum height (H) of the maximum height (H) from the rim diameter line (RL) outward in the radial direction. The intersection (R) is defined as the point where a straight line (kk ') parallel to the rim diameter line (RL) intersects the carcass line (C) in the lower region of the sidewall at a distance (MH) corresponding to three times the distance (MH). M), a vertical line (qq ′) standing on the rim diameter line (RL) at a distance of 0.5 times the width (W) of the narrow rim outward in the tire rotation axis direction is a carcass line (C ) At the intersection (K)
When these are defined respectively, these intersection (R) and intersection (K)
The carcass line (C) passes through the intersection (R) and the intersection (I)
At a distance from the arc (IR) in contact with the tangent line (mm ') into the tire, and the carcass line (C) passes through the intersection (K) at the intersection (I). And the contact point (A) between the carcass line (C) and the tangent line (mm ') is separated radially outward with respect to the intersection (I) with respect to the arc (KI) that contacts the tire. It consists of a complex curve that smoothly connects points (R), points (A) and points (K) satisfying the respective relative positional relationships.
A carcass line (C) composed of the composite curve
Normal internal pressure filling from the time of micro pressure filling of ear and rim assembly
Until completion, the entire area of the tread crown is outside the radial direction of the tire
Sideward from the tread contact width end to the tire maximum width position
The upper region of the wall is depressed and deformed toward the inside of the tire.
The lower part of the sidewall up to the contact points toward the outside of the tire
A heavy duty radial tire characterized by expanding and deforming . 10. A carcass line (C) separated from the arc (IR) in a tire mounted on an applicable rim, wherein a bead seat of the rim engaging a bead portion of the tire has an angle of about 5 ° with respect to the rotation axis of the tire. The following relationship 6.0 <(240 / H) × y <11.5 is satisfied with respect to the maximum height (H) for the maximum distance (y), and the carcass line is separated from the arc (KI). For the maximum distance (w) of (C), the following relationship is satisfied with respect to the maximum height (H): 4.0 <(240 / H) × w <9.5, and the intersection of the contact point (A) per distance in the radial outward direction (x) with respect to (I), according to claim 9, satisfying the following relationships 15.0 <(240 / H) × x <35.0 with respect to the maximum height (H) tire. 11. In a tire mounted on an application rim, wherein a bead seat of a rim engaged with a bead portion of the tire has an angle of about 15 ° with respect to the tire rotation axis, a carcass line (C) separated from the arc (IR) is provided. For the maximum distance (y), the following relationship 3.0 <(210 / H) × y <8.0 with respect to the maximum height (H) and the carcass line ( For the maximum distance (w) of C), the following relationship 2.0 <(210 / H) × w <8.0 is satisfied with respect to the maximum height (H), and the intersection (I) of the contact point (A) is satisfied. ) Satisfies the following relationship with respect to the maximum height (H): 6.0 <(210 / H) × x <30.0.
9. The tire described in 9 above. 12. Appropriate internal pressure for the above tire and rim assembly
Carcass line from the tire maximum width position
(C) The foot (n) of the normal drawn down and the narrow rim
Carcass line from the point where the tire surface touches the flange
(C) A point extending between two points with the foot (n ') of the normal dropped down.
Of the carcass line (C) below the sidewall
However, when filling with low pressure equivalent to 5% of the normal internal pressure, the inside of the tire
Which is either a curve or a straight line having a center of curvature
9. The tire described in 9 above. 13. The above tires with no load on the tires
From filling of the rim assembly with low pressure to filling with regular internal pressure
From the tread width end to the tread width center
The entire crown area up to the other contact width end is
Radially outward in the range of 0.5 to 4.0 mm
The side from the contact width end of the tread to the tire maximum width position
The upper area of the wall is 0.5-4m toward the inside of the tire
Deforms at the maximum displacement d within the range of m and deforms from the maximum width position of the tire to the rim flange on the tire surface.
The lower area of the sidewall up to the contact points toward the outside of the tire
Expansion deformation at the maximum overhang f within the range of 3 to 12 mm
10. The tire according to claim 9, wherein the tire is shaped. 14． The above tires with no load on the tires
From filling of the rim assembly with low pressure to filling with regular internal pressure
Before and after dent deformation in the upper region of the sidewall
Phase of point (F) and point (G) at the point of contact or intersection of the cross-sectional contour
Tire surface portion over between each other in length (c) is less when the
10. The tire according to claim 9, wherein the diameter is also 20 mm. 15. Turnback of carcass ply after filling with regular internal pressure
The height (HE) from the rim diameter line (RL) at the
10 to 35 of the maximum tire height (SH) after filling the internal pressure
The tire according to claim 12, which is in the range of%. 16. From the tire maximum width position after filling the regular internal pressure
Up to the point (G) measured above the sidewall
The radial distance (h) at
Not more than 0.15 times the maximum tire height (SH)
The tire according to claim 14.