CN111634158B

CN111634158B - Electric two-wheel vehicle tire

Info

Publication number: CN111634158B
Application number: CN202010612531.1A
Authority: CN
Inventors: 严永知
Original assignee: Cheng Shin Rubber Xiamen Ind Ltd
Current assignee: Cheng Shin Rubber Xiamen Ind Ltd
Priority date: 2020-06-30
Filing date: 2020-06-30
Publication date: 2024-07-23
Anticipated expiration: 2040-06-30
Also published as: CN111634158A

Abstract

The invention discloses an electric two-wheel vehicle tire, wherein the center of the tread of the tire is provided with a center pattern block with a continuous smooth surface, the tread adopts low rolling resistance rubber, and the two sides of the center line of the tread are provided with symmetrical but staggered shallow grooves, main grooves, large pattern blocks and small pattern blocks; the shallow trench is axially at a certain distance from the tread center line, the trench width of the main trench gradually presents an increasing trend from the inner side to the outer side, the axial length of the main trench does not cross the tread center line, the shallow trench and the main trench are respectively provided with a drainage slope at the sharp angle position close to the tread, the bottoms of the drainage slopes are circular arcs, the two drainage slopes form slopes after the circular arcs, and the slopes are transited to the trench bottoms with a certain depth. By designing the tread patterns of the tire, the invention can be simultaneously suitable for good road conditions in sunny days and easy-to-slip road conditions in rainy days.

Description

Electric two-wheel vehicle tire

Technical Field

The invention relates to the technical field of pneumatic tires, in particular to a pattern structure design of a tire tread of an electric two-wheeled vehicle.

Background

The demand of electric two-wheeled vehicles in the existing market is continuously increased, and with the continuous increase of the number of electric vehicles, the demand of use cannot be met by single performance, and the demand of people for the performance of tires is also increased. At present, the existing electric vehicle tire is only suitable for the road condition of fine conscience basically, as shown in fig. 1, the tread pattern of the existing common electric two-wheel vehicle tire is as follows: the tread is provided with a continuous and smooth central pattern block 10', so that rolling resistance is low, but in rainy days and on the road surface with accumulated water, the tread is easy to sideslip and fall down, and certain potential safety hazards exist. The special anti-skid tyre for rainy season is shown in fig. 2, the pattern blocks of the tyre tread are provided with shallow groove groups 20', the pattern blocks on the two axial sides of the central pattern block 10' are provided with shallow grooves and diamond roughening 1A ', and the friction force between the tyre and the ground is increased, so that the rolling resistance of the tyre is high, and the anti-skid effect is achieved. However, the rolling resistance increases, and the riding comfort decreases, which further affects the endurance of the tire. The current market lacks an electric two-wheel tire which can simultaneously adapt to the two road conditions.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide the electric two-wheel vehicle tire which can be simultaneously suitable for good road conditions in sunny days and easy-to-slip road conditions in rainy days.

In order to achieve the above object, the solution of the present invention is:

An electric two-wheel vehicle tire is characterized in that a center pattern block with a continuous smooth surface is arranged in the center of a tire tread, the tire tread adopts low rolling resistance rubber, and shallow grooves, main grooves, large pattern blocks and small pattern blocks which are symmetrically and alternately arranged are arranged on two sides of the center line of the tire tread; the shallow ditch is "reverse V" type, and shallow ditch axial has certain distance from the tread central line, the ditch width of main ditch presents the trend of increasing gradually from inboard to outside, and main ditch axial length does not cross the tread central line, and shallow ditch and main ditch are provided with the drainage slope respectively in the closed angle department that is close to the tread, and the radial top of drainage slope is the circular arc, and two drainage slopes form the slope after the circular arc, and the slope transitions to the ditch bottom of certain degree of depth.

After the structure is adopted, the central pattern block of the continuous smooth surface of the tread center of the electric bicycle tire can increase the contact area of the tire on a normal road surface without water accumulation in a sunny day, the stability of operation and the riding comfort are better, the tread adopts low rolling resistance rubber, the rolling resistance is greatly reduced, and the endurance schedule is increased while more electricity is saved; the shallow grooves on two sides of the tread center are inverted V-shaped, the opening shape is designed to be beneficial to breaking a water film during running in rainy days, the ground grabbing force is improved, the axial direction of the shallow grooves is a certain distance from the center line of the tread, the tread center is ensured to have a larger contact area with the ground, and good linear stability is achieved; the groove widths of the main grooves at the left side and the right side gradually increase from the inner side to the outer side, the axial length of the main grooves cannot cross the center line of the tread, and the main grooves have excellent performance on normal road surfaces without ponding on sunny days in order to ensure the contact area between the center of the tread and the ground. The shallow groove and the main groove are provided with drainage slopes at sharp corners, which are close to the tread, the radial top of each drainage slope is an arc, slopes of the two drainage slopes behind the arc gradually transition to a certain depth, and the cooperation design of the shallow groove and the main groove ensures that the tire has excellent drainage and water throwing performance when running in rainy days. Through designing the tread patterns of the electric bicycle tire, the electric bicycle tire can be simultaneously suitable for good road conditions in sunny days and easy-to-slip road conditions in rainy days.

Further, be provided with parallel shallow groove on the big decorative pattern piece, play the effect of drainage, promote skid resistance. Further, the width of the inverted V-shaped shallow groove axially away from the central line of the tread is set to be 10% -30% of the half width of the tread, so that the larger contact area between the center and the bottom surface of the tread is ensured, and the tread has good linear stability. The opening angle of the inverted V-shaped shallow groove is set to be 20-40 degrees, the too small opening angle cannot play a role in draining water and breaking a water film, even water accumulation is likely to occur, and the too large opening angle has a drainage effect, but the capability of breaking the water film is lost.

Furthermore, the main ditch is in a lightning shape, the axial width of the main ditch is 65% -90% of the half width of the tread, and the main ditch has excellent performance on normal road surfaces without ponding in sunny days in order to ensure the contact area between the center of the tread and the bottom surface.

Further, the angle formed by the main groove and the tire circumferential direction is set at 20-45 degrees, abnormal abrasion may occur when the tire is excessively bent at an excessive angle, the performance of the tire is affected, the angle is too small, and the drainage performance of the tire is not ensured.

Further, the included angles between the drain slopes of the shallow groove and the main groove and the radial direction of the tire are respectively set at 20-45 degrees, the radial top of each drain slope is an arc, the R angle is set at R0.5-R2, and the groove depth of the shallow groove is set at 30-50% of the groove depth of the main groove.

Further, a plurality of longitudinal concave-convex grooves are arranged on the large pattern at parallel intervals, a plurality of transverse concave-convex grooves are arranged on the small pattern block at parallel intervals, the axial length of each longitudinal concave-convex groove is 60% -85% of the half width of the tread, the center position of the tread is ensured to have a larger contact area, rolling resistance is reduced, and the axial length of each transverse concave-convex groove is 30% -50% of the half width of the tread.

Further, the depth of the longitudinal concave-convex groove is set to be 30% -50% of the depth of the main groove, the depth of the transverse concave-convex groove is set to be 25% -40% of the depth of the main groove, and the depth of the longitudinal concave-convex groove is always larger than the depth of the transverse concave-convex groove, so that the stability of the tire when the tire is driven on a road surface in a rainy day after being bent can be ensured for a long time.

Further, the groove depths of the longitudinal concave-convex grooves and the transverse concave-convex grooves are respectively staggered at intervals, the deeper depth of the longitudinal concave-convex grooves is 40% -60% of the main groove depth, the deeper depth of the transverse concave-convex grooves is 30% -50% of the main groove depth, the shallower groove depth can ensure the rigidity of the tire, and the deeper groove depth can continuously ensure the anti-skid performance of the tire.

Further, the small pattern blocks are further provided with drainage ditches which are M-shaped, so that the local drainage performance of the tire is ensured, and the anti-skid effect of the tire is further improved.

Drawings

FIG. 1 is a schematic view of the tread pattern of a conventional electric two-wheeled vehicle;

FIG. 2 is a schematic diagram of the surface pattern of an existing electric two-wheeled tire in a common rainy season;

FIG. 3 is a schematic representation of a tread pattern of one embodiment of the tire of the present invention;

FIG. 4 is an enlarged view of a portion of the shallow trench pattern of FIG. 3;

FIG. 5 is a cross-sectional view A-A' of FIG. 3;

FIG. 6 is a section B-B' of FIG. 3;

FIG. 7 is a schematic representation of a tread pattern of another embodiment of the tire of the present invention;

FIG. 8 is a cross-sectional view of C-C' in FIG. 7;

FIG. 9 is a sectional view of D-D' in FIG. 7;

FIG. 10 is another representation of the cross-sectional view C-C' of FIG. 7;

Fig. 11 is another representation of the cross-sectional view D-D' of fig. 7.

Detailed Description

In order to further explain the technical scheme of the invention, the invention is explained in detail by specific examples.

The present invention discloses a tire for an electric bicycle as shown in fig. 3 to 11. In fig. 3, the vertical direction is set to the tire circumferential direction, the lateral direction is set to the tire axial direction, CL denotes the tread center line, the tread center line is axially inward, the tread center line is axially outward, and the vertical direction is set to the tire radial direction in fig. 8.

As shown in fig. 3, the tread center of the electric two-wheeled vehicle tire is provided with the continuous smooth pattern block 10, so that the contact area of the tire on a normal road surface without water accumulation on a sunny day is increased, the stability of operation and riding comfort are better, the tread rubber adopts a special low-rolling-resistance formula, the viscoelasticity Tan delta (60 ℃) value of the rubber is below 0.12, the viscoelasticity rolling resistance of the low-rolling-resistance formula rubber is improved by 30% -50% compared with that of the conventional common formula, the rolling resistance is greatly reduced, and the endurance mileage is increased while the electric vehicle is more saved. The tread center axial outermost side is equipped with big decorative pattern piece 30 and little decorative pattern piece 20, is provided with parallel shallow groove 31 on the big decorative pattern piece 30, plays the effect of drainage, promotes anti-skidding performance. As shown in fig. 4, the inverted V-shaped shallow grooves 21 are distributed on two sides of the tread center line CL, the inverted V-shaped design is beneficial to breaking a water film when a road surface runs in a rainy day, the grip force is improved, the opening angle alpha of the inverted V-shaped shallow grooves 21 is optimally set to 20-40 degrees, too small opening angle cannot play a role in draining water and breaking the water film, even water is likely to be generated, and too large opening angle has a drainage effect, but the capability of breaking the water film is lost. The width W4 of the inverted V-shaped shallow groove 21 axially away from the tread center line CL is set to be 10% -30% of the tread half width W, so that the tread center and the ground have a larger contact area, and good linear stability is achieved. The two sides of the tread center in the axial direction are provided with the continuous extension main grooves 22 which are like lightning, the groove width S from the inner side to the outer side in the axial direction is gradually increased, the axial width W1 of the main grooves 22 is 65% -90% of the half width W of the tread, the main grooves cannot cross the tread center line CL, the contact area of the tread center and the ground is ensured, and the normal road surface without water accumulation on a sunny day has excellent performance. The main groove 22 forms an angle lambda with the tire circumferential direction, the angle lambda is optimally set at 20-45 degrees, abnormal abrasion may occur when the tire is excessively bent, the performance of the tire is affected, and the drainage performance of the tire is not ensured when the angle is excessively small. As shown in fig. 5 and 6, the shallow grooves 21 and the main grooves 22 are provided with drain slopes 21A, 22A (shown by solid filling in the figure) at their sharp corners near the tread, respectively. The included angles of the drain slopes 21A and 22A and the radial direction of the tire are beta and gamma, the angles are set at 20-45 degrees, the radial tops of the drain slopes 21A and 22A are circular arcs RA and RB, and the R angle is set at R0.5-R3.5. Wherein the circular arc RA of the drain slope 21A gradually transits to the trench bottom 21B, the circular arc RB of the drain slope 22A gradually transits to the trench bottom 22B, and the trench depth H1 of the shallow trench is set to be 30% -50% of the trench depth H of the main trench 22. The matching design of the shallow grooves 21 and the main grooves 22 ensures that the tire has excellent water draining and throwing performance when running in rainy days.

FIG. 7 is another embodiment of a tire tread pattern of the present invention: the structure and principle of this embodiment are substantially the same as those of the first embodiment, and the same parts will not be described in detail, except that: in order to further increase the stability in the case of over-bending in a rainy day and prevent slipping, the large blocks 30 and the small blocks 20 are provided with longitudinal concave-convex grooves 30 'and transverse concave-convex grooves 20' which are densely and parallelly arranged at intervals. The axial length W2 of the longitudinal concave-convex groove 30 'is set to be 60-85% of the half width W of the tread, a larger contact area is ensured at the center of the tread, rolling resistance is reduced, and the axial length W3 of the transverse concave-convex groove 20' is set to be 30-50% of the half width W of the tread. As shown in fig. 8 and 9, the depth H2 of the longitudinal concave-convex groove 30 'is set to 30% to 50% of the groove depth H of the main groove 22, the depth H3 of the transverse concave-convex groove 20' is set to 25% to 40% of the groove depth H of the main groove 22, and the depth H2 of the longitudinal concave-convex groove 30 'is always larger than the depth H3 of the transverse concave-convex groove 20', so that the stability of the tire during road surface over-bending running in a rainy day can be ensured for a long time. Fig. 10 and 11 show another expression of the longitudinal concave-convex grooves 30 'and the transverse concave-convex grooves 20', and the groove depths thereof are changed into a structure with staggered depth and shallow intervals. The depth H2 'of the longitudinal concave-convex groove 30' is set to 40% -60% of the groove depth H of the main groove 22, and the depth H3 'of the transverse concave-convex groove 20' is set to 30% -50% of the groove depth H of the main groove 22. The shallower groove depths H2, H3 can ensure rigidity of the tire, and the deeper groove depths H2', H3' can continuously ensure anti-skid performance of the tire. The small pattern block 20 is also provided with a drain ditch 23, the drain ditch 23 is shaped like an M, the local drainage performance of the tire is ensured, and the anti-skid effect of the tire is further improved.

In summary, the electric bicycle tire of the present invention has a center block 10 with continuous smooth surface at the tread center, and shallow grooves 21, main grooves 22, large blocks 30, and small blocks 20 are alternately distributed along both sides of the tire center line CL. The center block 10 with continuous smooth surface is arranged in the center of the tread, so that the contact area of the tire on a normal road surface without accumulated water on a sunny day is increased, and the steering stability and riding comfort are better. The tread rubber adopts a special low rolling resistance formula, so that rolling resistance is greatly reduced, and the endurance mileage can be increased while more power is saved. The shallow grooves 21 on the two sides of the tread center line CL are in an inverted V shape, the opening angle of the shallow grooves is optimally set to be 20-40 degrees, and the opening shape is favorable for breaking a water film and improving the grabbing force during running in rainy days. The width of the shallow groove 21 axially away from the tread center line CL is set to be 10% -30% of the half width of the tread, so that the tread center and the ground have a larger contact area, and good linear stability is achieved. The main grooves 22 on the left and right sides gradually show increasing trend from the inside to the outside, the axial length of the main grooves does not cross the tread center line CL, and the main grooves have excellent performance on normal road surfaces without water accumulation on sunny days in order to ensure the contact area between the tread center and the ground. The main groove 22 forms an angle λ with the tire circumferential direction, and the optimum angle is 20 ° to 45 °. The shallow grooves 21 and the main grooves 22 are provided with drainage slopes 21A and 22A at sharp corners of the shallow grooves and the main grooves, which are close to the tread, the included angles between the drainage slopes 21A and 22A and the radial direction of the tire are beta and gamma, and the radial tops of the drainage slopes 21A and 22A are circular arcs. The two drainage slopes 21A and 22A gradually transition to the bottom of a ditch with a certain depth after being circular arcs, and the cooperation design of the shallow ditch 21 and the main ditch 22 ensures that the tire has excellent drainage and water throwing performance when running in rainy days. The large blocks 30 and the small blocks 20 are provided with the longitudinal concave-convex grooves 30 'and the transverse concave-convex grooves 20' which are densely and parallelly spaced, and the depth of the longitudinal concave-convex grooves 30 'is always larger than that of the transverse concave-convex grooves 20', so that the stability of the tire when the tire is in the road surface over-bending running in the rainy day can be ensured for a long time. The longitudinal concave-convex grooves 30 'and the transverse concave-convex grooves 20' can be in a structure mode of interval, staggering and one depth to one shallow, the rigidity of the tire is ensured by the shallow depth, and the long-time anti-skid performance of the tire is ensured by the deep depth. The small pattern blocks 30 are also provided with drainage ditches 23, so that the local drainage performance of the tire is ensured, and the anti-skid effect of the tire is further improved. The longitudinal concave-convex grooves 30', the transverse concave-convex grooves 20' are matched with the design of the shallow grooves and the main grooves, so that the anti-skid performance is achieved, and the drainage performance is also achieved.

The above examples and drawings are not intended to limit the form or form of the present invention, and any suitable variations or modifications thereof by those skilled in the art should be construed as not departing from the scope of the present invention.

Claims

1. An electric two-wheeled vehicle tire, characterized in that: the center of the tread of the tire is provided with a center pattern block with a continuous smooth surface, the tread adopts low rolling resistance rubber, and the two sides of the center line of the tread are provided with shallow grooves, main grooves, large pattern blocks and small pattern blocks which are symmetrically and alternately arranged; the large pattern blocks and the small pattern blocks are arranged on the outermost side of the central axial direction of the tread, the shallow grooves are axially at a certain distance from the central line of the tread, the groove width of the main groove gradually increases from the inner side to the outer side, the axial length of the main groove does not cross the central line of the tread, the shallow grooves and the main groove are respectively provided with drainage slopes at sharp corners close to the tread, the radial tops of the drainage slopes are circular arcs, the two drainage slopes form slopes after the circular arcs, and the slopes are transited to the groove bottom with a certain depth; the large pattern is provided with a plurality of longitudinal concave-convex grooves at parallel intervals, the small pattern block is provided with a plurality of transverse concave-convex grooves at parallel intervals, and the groove depths of the longitudinal concave-convex grooves and the transverse concave-convex grooves are respectively staggered at intervals.

2. An electric bicycle tire as in claim 1, wherein: the width of the shallow groove along the axial direction of the tread is 10% -30% of the half width of the tread, and the opening angle of the inverted V-shaped shallow groove is 20-40 degrees.

3. An electric bicycle tire as in claim 1, wherein: parallel shallow grooves are formed in the large pattern blocks.

4. An electric bicycle tire as in claim 1, wherein: the main ditch is in a lightning shape, and the axial width of the main ditch is 65% -90% of the half width of the tread.

5. An electric bicycle tire as in claim 1, wherein: the angle formed by the main groove and the circumferential direction of the tire is 20-45 degrees.

6. An electric bicycle tire as in claim 1, wherein: the included angles between the drain slopes of the shallow grooves and the main grooves and the radial direction of the tire are respectively set at 20-45 degrees, and the groove depth of the shallow grooves is set to be 30-50% of the groove depth of the main grooves.

7. An electric bicycle tire as in claim 1, wherein: the maximum axial length of the longitudinal concave-convex groove is set to be 60% -85% of the half width of the tread, and the maximum axial length of the transverse concave-convex groove is set to be 30% -50% of the half width of the tread.

8. An electric bicycle tire as in claim 7, wherein: the depth of the longitudinal concave-convex groove is set to be 30-50% of the depth of the main groove, the depth of the transverse concave-convex groove is set to be 25-40% of the depth of the main groove, and the depth of the longitudinal concave-convex groove is always larger than the depth of the transverse concave-convex groove.

9. An electric bicycle tire as in claim 7, wherein: the depth of the longitudinal concave-convex groove is set to 40-60% of the depth of the main groove, and the depth of the transverse concave-convex groove is set to 30-50% of the depth of the main groove.

10. An electric bicycle tire as in claim 7, wherein: and the small pattern blocks are provided with drainage ditches which are M-shaped.