TW530012B - Pneumatic tire - Google Patents

Abstract

Six block rows extending in a tire circumference direction are formed by a narrow groove, main grooves, and left and right lug grooves in a tread surface, the rotating direction of which is specified to one direction. The average tire circumference direction length of the blocks of the block rows in the center area of the tread surface is 4 to 5% of the tire full circumference length on the tire center line. Each of the left and right lug grooves is formed as a tapered groove having wider groove width on the side of the tire center line. Left and right main groove portions located between the lug grooves are formed as inclined grooves inclining so as to expand towards the reverse direction to the rotating direction of the tire. Subgrooves crossing the blocks in the tire width direction are formed on the surfaces of the blocks in the shoulder areas.

Description

530012 V. Description of the invention (1) Background of the invention The present invention relates to a pneumatic tire. More specifically, it relates to improving dry performance (dry road performance) while maintaining σ 喿 noise performance and partial wear performance, and Inflatable wheel platform with wet performance (wet road performance). Pneumatic tires having a linear main groove extending in the tire circumferential direction and tooth grooves extending in the tire width direction to form a plurality of blocks on the wheel surface are difficult to have both wet performance and noise performance. It is precisely because of the improvement of wet skid performance that the groove width needs to be increased. As a result, noise performance is deteriorated due to an increase in the groove area. On the other hand, it is necessary to narrow the groove width in order to improve noise performance. As a result, the reduction of the groove area deteriorates the drainage effect and reduces the wet skid performance. Therefore, in a pneumatic tire with a conventional block pattern, the wet performance and noise performance are in a contradiction between the two principles if one party improves and the other improves. Therefore, as a countermeasure, a technique has been proposed in which V-shaped grooves having a predetermined pitch are arranged in the tire circumferential direction of the wheel surface instead of the main grooves. This ensures good drainage and reduces air column resonances, improving noise to around 1 kHz. However, the block formed by the V-shaped groove relatively has the problem of deteriorating the abrasion resistance. SUMMARY OF THE INVENTION The object of the invention is to provide a pneumatic tire which has higher noise performance, partial abrasion resistance performance, and improved wet skid performance and drying performance than conventional levels. To achieve the above object, the pneumatic tire of the present invention has the following characteristics:

C: \ 2D-CODE \ 91-08 \ 91112092.ptd Page 5 530012 5. Description of the invention (2) — sign; the direction of rotation of the tire is specified at — on the tire centerline along the circumference of the tire, A two straight, thin straight grooves and two main grooves are formed on both sides of the width direction of the narrow groove, and the left and right inclined grooves extend from the aforementioned tire circumferential direction at a predetermined interval to extend from the tire rotation direction to 1. , / 冓 In the tire width direction on both outer tire circumferential directions, and the left and right tooth grooves on the ^ -direction side are arranged in the block circumferentially extending in the wheel circumferential direction in the wheel, item '项, main groove and tooth groove directions, respectively. A row is formed on the left and right shoulders of the tire; the center will be centered on the central surface. The central part forms 4 rows, and the average tire circumference long tooth groove in a block whose degree is the tire circumference of the tire center line ^ constitutes a groove width of 4 to 5% of the tire center line plus f; the aforementioned left and right grooves are located at The aforesaid tapered right main groove portion narrowed in the circumferential direction of the tire and narrowed at the shoulder constitutes a left-slope inclination to the tooth groove that rotates a predetermined distance from the tire; The way is tilted in the circumferential direction, and when the main groove is seen from the circumference of the wheel to the tire circle, one or two f = f from the circumferential direction of the main groove, the end way is to connect the aforementioned inclined groove and Structure: On the surface of the other shoulder of Zhou Fang'l, there is a width to the tire ^ to produce, to help ditch on the left and right. The average tire circumferential length of the block in the center of the auxiliary wheel surface of the block is 4-5 :. ‘This type of block is longer than the conventional block: longer’: the length of the circumference to increase the rigidity of the central block. However, it can be changed to cover two: so, but also, the grooves are tilted in the reverse direction of the tire rotation direction 0 ;: == can increase the groove width for the drainage performance of the central part of the wheat / dagger has the same groove Area of tires, which can improve wet skid, and can be better than page 6 C: \ 2D-CX) DE \ 91-08 \ 91112092.ptd 530012 5. Description of the invention (3) As mentioned above, in the center of the wheel surface The average tire circumferential length of the extended section and the widened groove area of the groove will increase noise. However, because the main groove divided by the left and right grooves forms an inclined groove, the air column resonance sound generated by the main groove is reduced. It improves noise to around 1 kHz. Moreover, because the auxiliary groove of the shoulder divides a small block, the distance between the shoulder and the groove formed by the auxiliary groove is substantially twice the distance between the central portion and the distance between the shoulder and the central portion. The difference contributes to the white noise of the pitch noise. Furthermore, since the left and right tooth grooves are gradually narrowed in the tire width direction, air noise generated by the left and right tooth grooves at the shoulders can be reduced. Therefore, it is possible to reduce the increased noise due to the improvement of the drying performance and the slip performance, and it is possible to maintain the noise performance at the same level as the conventional level. In addition, since the fine grooves, the main grooves of the wheel surface and the conventional ones continue substantially linearly along the tire circumferential direction, there is no problem of deterioration of the abrasion resistance performance like a tire having a V groove. Detailed description of a preferred specific example The pneumatic tire of the present invention shown in FIG. 1 is provided along the tire circumference on the tire center line CL of the tread 1 in a direction indicated by an arrow R in the tire rotation direction A thin groove 2 extending linearly in the direction T. On the treads 1 on both sides in the tire width direction of the narrow grooves 2, left and right main grooves 3 and 4 extending in the tire circumferential direction T are formed at predetermined intervals in the tire width direction. The left and right tooth grooves 5 extending from the narrow groove 2 to both sides in the tire width direction are arranged along the tire circumferential direction T at a predetermined pitch. Most of the blocks 6 are divided and formed on the tread 1 by using the fine grooves 2, the main grooves 3, 4 and the tooth grooves 5. These blocks 6

C: \ 2D-CODE \ 91-08 \ 91112092.ptd Page 7 530012 V. Description of the invention (4) Due to the narrow groove 2 and the left and right main collapse ^ / ^ ° / mold 3 4, divided into 6 along the tire circumferential direction Column block column. On the left and right of the main man: the central part 1A of the wheel surface 1 between the screen 4 and J ΒΊ. ^ ^, Forming the left and right two columns of blocks XI, X2; in Lumu Λ, the left and right main ditch 4 Left and right shoulders 1 β

To form a series of blocks X3. D The left and right tooth grooves 5 are used to distinguish between the main grooves ^ ^, .. nA ^ The left and right main grooves 3 a and 4 a formed by the knife are formed in the direction 疋 opposite to the tire rotation direction r. The inclination range is-n ^ ^ Η Λ 1 m The wheel surface 1 is spread toward the tire circumferential direction T to surround the tire for one circumference. From the inner circumference of the tire, ^ ^ ^., Λ, when looking at the main grooves 3 and 4 by the door gimbal, you can see the main from one end in the circumferential direction to the other, and install π ^ η m.. ^ Main, 冓 3, 4 ; In the scope of the so-called see-through state, the main grooves 3 and 4 are connected and the right groove 1 ^ ^ is a see-through groove formed by a sloping groove with a directionality. The tooth groove 5 of the left and right sides is from the Han: 2 rS It is recognized that the inclined groove is inclined in the direction opposite to the tire rotation direction R. The inclination is: Ugly, 4. & i, "θ Needle open y becomes arc-shaped convex toward the reverse direction side. The groove 5 沟 is along the tire circumferential direction τ ,,,, μ ^, w The lengths are staggered and asymmetric with respect to the tire centerline CL. The groove width of each tooth groove 5 is widened on the tire centerline CL side, and the shoulder_side is narrowed to form a tire width from the tire centerline CL side. The width gradually decreases at the outer side of the groove gradually. The average tire circumferential length L of the tire circumferential direction length L in the block row XI and block XA of the block 1A at the central portion is 4 times the tire circumferential length above the tire center line. -5% (essentially, the total number of tires in one week is 20-25), and the length in the circumferential direction of the block 6 A in the center 1 A [longer than conventional. Therefore, it is in the center as described above. The groove width of the tooth groove 5 of the section A can ensure a large and wide groove area, and a high block rigidity can be obtained in the tire circumferential direction.

C: \ 2D-CODE \ 91-08 \ 91112092.ptd Page 8 53〇〇12

= The surface of each block 6β of the right shoulder IB is formed with two auxiliary tires to the tire and the second = the small and six small blocks 6B1 which are divided into front and rear are provided: Qing 7. The Hei Auxiliary 7 series extends to the block 6A of the block 16 with the shoulder 16. As shown in the figure, although the auxiliary ^^ 乂 a is located in the block ", the auxiliary groove 7 may also be

Block 6A is divided into front and back. The queen holds d A. Moreover, the tooth groove 5 is an inclined groove inclined to the side opposite to the tire rotation direction R. Its enlarged groove width has a large effect on the drainage performance of the central portion 1A, so it is the same as the conventional one. Groove area of the tire, it can improve

Therefore, in the present invention, the length is the circumference of the tire, so the supplementary drying performance is increased (driving, the 4-A length of the 6 A block in the central portion is 4-5%, compared with the performance of the block located 1 A in the central portion. Braking performance). Knowing the average tire circumference also lengthens the rigidity of block 6 A. As a result, it can be mentioned as above, 'Although the average tire circumferential direction length of the block βA is lengthened, the groove area of the tooth groove 5 of the central portion 1 A is widened, and these reasons will increase by%.' The main grooves 4 and 4 on the left and right sides of the cut are inclined grooves, so the air column resonance sound generated by the main grooves 3 and 4 can be reduced and the noise can be improved to around 1 kHz. In addition, since the auxiliary groove 7 is a small block 6 B1 that divides the block 6B of the shoulder 1B, the auxiliary groove 7 and the tooth groove 5 are spaced by the shoulder 丨 B ^ ^ ^ ^ ^ Extra shoulders 1B = 2: The difference in the number of pitches contributes to the white noise of the pitch noise (the frequency generated by the dispersion).

530012 5. Description of the invention (6) Furthermore, because the groove width of the left and right tooth grooves 5 is gradually narrowed toward the outside of the tire width direction, the air vibration generated by the tooth grooves 5 at the shoulder 1 B can be reduced. With the improvement of dry performance and wet slip performance, the deterioration of noise can be offset, and the voice performance can be maintained at the same level as the conventional level. In addition, since the fine grooves 2 and the main grooves 3 and 4 of the wheel surface 1 are arranged substantially linearly in the tire circumferential direction T as in the conventional case, there is no problem of deterioration of the abrasion resistance. If the average tire circumferential length of block 6A is less than 4%, the block rigidity will be reduced, and in effect, it will be difficult to improve the drying performance. In contrast, if it exceeds 5%, noise performance will deteriorate. If the tooth groove 5 is not a tapered groove as described above but a general groove width, not only the wet skid performance cannot be improved, but also the noise performance will be deteriorated. In the present invention, the groove width of the fine groove 2 can be set to 1 mm to 5 mm. If the groove width is narrower than 1 mm, the drainage effect will be deteriorated. On the other hand, if it is wider than 5mm, it will cause increased noise due to air column resonance. In order to whiten the pitch noise, the left and right tooth grooves 5 are preferably provided along the tire circumferential direction with a variable pitch. With this setting, the auxiliary groove 7 should be set to twice the pitch number (pitch type) of 1 A at the center. This pitch type will make the white noise of the pitch ° sound better. The groove area ratio of the entire groove on the tread 1 can be set to 26% to 36% as in the conventional case. Although the present invention is particularly suitable for a pneumatic tire for a vehicle, it is not limited thereto.

C: \ 2D-CODE \ 91-08 \ 9m2092.ptd Page 10 530012

Table 1 uses the tire size 22 5 / 45ZR17 as the common size, and records the average tire circumferential direction length and the groove value of the block of the central 4; the ^ 7 blade has the tire 1 of the present invention shown in FIG. 1 -2. Compare the conventional tires in which the tires 4 and ⑺ tires have linear main grooves in the circumferential direction and block grooves in the tire width direction. The tires 1 to 2 of the present invention and the comparative tires have a groove width of 3 mm and a groove area ratio of 33%. In addition, the average tire circumference of a block of a known tire

The directional length is 3.5% of the tire circumference on the tire centerline, and the groove ratio is 33%. 1. Install each test tire on t on a steel ring with a steel ring size of 1 7 X 7 1/2 JJ. The air pressure is set at 220kPa and installed on a vehicle with a displacement of 2 50 0cc. The measurement conditions were evaluated and tested for drying performance, wet skid performance, noise performance and anti-abrasion performance. The results shown in Table 1 were obtained. Dry performance, driving performance, dry road test road, five drivers' driving feeling test was implemented, and the index of conventional tires was set to 丨 〇 〇 to evaluate the results. The larger the value, the better the drivability when the road surface is dry. Braking characteristics On the test course of dry roads, test the braking distance at the speed of 1000 km / h and set the index of the conventional tire to 100 to evaluate the results. The greater the value, the better the braking performance when the road surface is dry.

530012

Wet performance Rideability On the test course of wet road, the index w of the conventional tire is set. . The greater the "driving" feeling, the better the controllability when the road is wet and slippery. The value of this braking performance is on the test course of a wet road with a water depth of about 3mm and the braking distance when braking at 100km / h. And set = 速度 at a speed of 100 to evaluate the results. The larger the value, the better the road == tire index value. Braking performance when the surface is wet and slippery Drainage water: 馼 Enter the water depth average 1 ()- When the slippery surface of the road occurs, 乂 = ί degree, and the index of the conventional tire is set to 100 to evaluate the greater the value ^, the better the drainage performance when traveling in a straight line. Rotation drainage performance at a constant speed of radius 1 The speed test and the maximum acceleration test at the time when water resistance occurred on a slippery pavement with an average depth of 10 mm after a stable circumferential rotation of 0 0 m, and the index of the conventional tire was set to 0 0 0 to evaluate the results. The larger the value, the better the drainage performance during rotation. Noise performance On the test course of asphalt pavement, test the noise at a straight line break at a speed of 60km / h, and set the value of the conventional tire to 100%. Evaluate the results. The larger the value, the better the noise performance Uneven wear properties

530012 V. Description of the invention (9) On the test course of asphalt pavement, test the difference between the maximum abrasion amount and the minimum abrasion amount of the block after driving 1000 km at + average speed 40km / h, and set the known tire The index value is 1 0 0 to evaluate the results. The larger the value, the better the abrasion resistance. Each index value above 105 is effective, and 96-1104 is the same level as the conventional one. [Table 1] Known tire comparison wheel The present invention comparison wheel comparison wheel ---------- | Comparison tire 1 tire 1 tire 2 tire 2 tire 3 tire 4 block average tire ..- ----- ----- Length in the circumferential direction (° / 〇3.5 3.5 4 5 5.5 4 5 Fixed groove width gradually decreasing groove gradually decreasing groove gradually decreasing groove fixed groove width fixed groove width drying performance controllability 10 0 1 03 1 05】 08】 10 102 105 Braking performance 1 00 1 03 106】 09 1】 0 103 1 06 Wet slip performance ----- — ~ Controllability 1 00 1 03 106】 08 1 08 103 1 04 Braking performance 1 00 1 07 1 06】 05 1 03 100 10 1 straight drainage 100 1 05 1 07 1 07】 08 103 1 03 rotary drainage 1 00 1 03 105 105 104 102 1 02 noise performance 1 00】 05 1 00 9 7 94 95 92 Vol. 1 Low Hemp Dagger 1 03 1 05 1 07 ------ _ 1 朐 ΐ ΐ ΐ 1 soil moon dagger 10 0 110 102 1 05 ------ 1 ---- -From Table 1, it can be seen that the tire of the present invention can maintain noise performance and anti-abrasion performance above the conventionally known level, and can simultaneously improve wet skid performance and

C: \ 2D-CODE \ 91-08 \ 91112092.ptd Page 13 53012 V. Description of the invention (ίο) Drying performance is as described above. The length of the cigarette in the circumferential direction is compared; 'The average of the blocks in the central part is The central part of the block is rigid, so you can ask for two; this "in place, the tooth groove is made of wood along the direction of tire rotation, and the central part of the groove is widened, so: The left and right main grooves are formed into a slant, cover, and goods. ≫ Singing sounds, and auxiliary grooves 7 are arranged on the shoulders to make the pitch noise stand. The shoulders are made * / dull, and the average tire circumference of the block in the center of the wheel surface is also vibrated to prevent the noise from deteriorating due to the increase in area, so it can be used only for degrees. The performance of the Yu Yuyin is like the tire component number description of the V-shaped groove. 1 Tread 1A Central portion 1B Shoulder 2 Fine groove 3 Main groove 3 a Part of the main groove 4 Main groove 4a Part of the main groove The narrow groove and main groove provided on the wheel surface are the same as the self-knowledge. Λ, it was made in the direction of the tire circumference.

Λ C: \ 2D-OODE \ 91-O8 \ 91112092.ptd Page 14 53012 V. Description of the invention (11) 5 Gully 6 Block 6 A Block 6B Block 6B1 Block 7 Auxiliary groove CL Tire centerline L Tire circumferential length R Tire rotation direction T Tire circumferential direction XI Block column X2 Block column X 3 Block column

mm

C: \ 2D-CODE \ 91-08 \ 91112092.ptd Page 15 530012 Brief Description of Drawings Figure 1 is an expanded view of the main part of the tread of a pneumatic tire of the present invention 1111 C: \ 2D-CODE \ 91-08 \ 91112092 .ptd Page 16

Claims (1)

53〇〇2 /, 'Scope of patent application, h A pneumatic tire whose tire rotation direction is specified in one direction = the wheel surface, and a linear thin groove extending in the tire circumferential direction along the tire circumferential direction is provided, and Two left and right main grooves extending in the circumferential direction of the wheel i are formed on both sides of the tire width direction of the narrow groove, and the predetermined distance will be from the front: the narrow groove will extend obliquely to the tire width direction outside, and The left and right tooth grooves are arranged in the tire circumferential direction, and four rows are formed from the aforementioned groove, main groove, and tooth groove to the center of the block in the tire circumferential direction, and are formed on the left and right shoulders. The average length in the circumferential direction of the block in the block row of the central part is set ;;; the shoulder length I on the center line of the tire circumference I II! The left and right u grooves form a tapered groove whose groove width is widened on the tire centerline side and narrowed on the chip β side; τ right main im: the left oblique inclination between the tooth grooves arranged in the circumferential direction according to the prescribed pitch; And the direction of 丄 he expands in the opposite direction and the direction of inclination 屝 P 卩 ,,, A • The wheel surface is seen around the tire 〆 circumferential direction of the tire circumference through this: groove ii: the tire circumferential direction when looking at the main groove above , Connect the aforementioned inclination: to the other side of the circumferential direction = to the aforementioned main groove on the left and right shoulders; cut the auxiliary groove of the block. On the ghost surface, there are pneumatic tires that are transverse to the width of the tire. 2. As for the left and right main grooves of the patent application range, the pneumatic tires have an inclination ^ f toward each tire groove and the tire rotation direction. Expansion in the opposite direction, such as the pneumatic tire according to item 1 of the patent application scope, wherein the aforementioned fine grooves my C: \ 2D-CODE \ 91-08 \ 91112092.ptd Page 17 530012 VI. The groove width for patent application is lmm ~ 5mm. 4. The pneumatic tire according to item 1 of the patent application, wherein the inner end of the auxiliary groove is located in a block adjacent to the central portion of the shoulder block row. 5. The pneumatic tire according to item 1 of the patent application scope, wherein the inner end of the auxiliary groove is connected to the main groove inside the main groove. 6. The pneumatic tire according to item 1 of the patent application, wherein the left and right tooth grooves are staggered along the tire circumferential direction. 7. The pneumatic tire according to item 1 of the patent application scope, wherein the left and right tooth grooves are arranged along the tire circumferential direction according to a variable pitch. 8. The pneumatic tire according to item 7 of the scope of patent application, wherein the pitch type that is twice the pitch type distinguished by the aforementioned tooth groove is formed by the aforementioned auxiliary groove and tooth groove on the shoulder portion. And configuration. iiii m C: \ 2D-CODE \ 91-08 \ 91112092.ptd Page 18