CN202742997U - Pneumatic tire for electric bicycle - Google Patents

Abstract

A pneumatic tire for electric bicycles, which includes a central area of the tread, two symmetrical transition areas, and two symmetrical shoulder areas, in which a number of inclined pattern grooves are uniformly distributed on both sides of the circumferential center line of the tread, corresponding to A transverse pattern groove is arranged between two adjacent inclined pattern grooves, and a branch pattern groove is arranged between each transverse pattern groove and the inclined pattern groove; the upper end of the inclined pattern groove is connected with the inner end of the transverse pattern groove and extends to the central area, The lower end and outer end of the branch groove run through and run through the edge of the tread; the branch groove is designed in an inclined inverted L shape, its upper end connects with the near middle of the inclined groove, and the lower end of the transverse groove penetrates near the inner end, while the bent The upper portion extends to the border between the central area and the transition area; three types of grooves divide the tread into central blocks, transition blocks and shoulder blocks. In order to achieve no loss of rolling resistance performance, effectively improve the overall performance of the tire such as grip performance, wear performance, drainage performance, and cornering safety.

Description

Pneumatic tires for electric bicycles

technical field

The utility model relates to a tire for a two-wheel vehicle, in particular to a pneumatic tire for an electric bicycle with balanced improvement of various performances and superior comprehensive performance.

Background technique

Electric bicycle is an emerging hot transportation means in recent years. It is safer and cheaper than motorcycle, but faster and labor-saving than pedal bicycle. As international oil prices continue to rise and urban traffic congestion becomes increasingly serious, more and more people choose to buy electric bicycles for commuting and short-distance transportation. Therefore, the performance requirements for electric bicycles on the road have been further improved in the market.

At present, most electric bicycle tires emphasize power-saving performance, and the tire tread pattern design focuses on rolling resistance performance, resulting in a relatively single function of the pattern, which cannot cope with various conditions of the vehicle's road surface.

In general, electric bicycle tires adopt a mixed pattern design: a linear pattern in the center of the tread, and inclined pattern grooves on both sides. The central area of the tread is designed as a smooth linear pattern to reduce rolling resistance, but it will make the tire's grip performance on dry and wet ground insufficient and affect the handling performance of the vehicle. In order to improve the grip performance and drainage performance of dry and wet land, the inclined pattern grooves on both sides are extended to the center line of the tread, and the circumferential pattern of the tread center is cut into several small pieces. Because the land ratio is too small. It not only reduces the circumferential rigidity of the pattern block, but also increases the rolling resistance, and also causes the rubber in this area to wear too fast, thereby shortening the service life of the tire.

In view of the use defects of the above-mentioned existing electric bicycle tires, it is necessary to comprehensively consider the various conditions and performance requirements of the road surface used by the vehicle, and optimize the combination of various performances, and this case arose from this.

Utility model content

The purpose of this utility model is to provide a pneumatic tire for electric bicycles that can effectively improve grip performance, abrasion performance, drainage performance, and cornering safety without losing rolling resistance performance, so that its comprehensive performance is superior.

To achieve the above object, the solution of the present utility model is:

A pneumatic tire for electric bicycles, the tread of which includes a central area filled with standard wind pressure tires in contact with the ground when running straight, two symmetrical transition areas where the tire contacts the ground when turning, and a tire that contacts the ground when turning sharply. There are two symmetrical shoulder areas, in which: a number of oblique grooves are uniformly distributed on both sides of the tread circumferential centerline, and lateral grooves are arranged between adjacent two oblique grooves, and between each lateral groove and There are branch grooves between the inclined grooves; the upper end of the inclined grooves extends to the central area, and the lower end runs through the edge of the tread, and the upper end of the inclined grooves gradually widens toward the lower end; the transverse grooves are V-shaped. , its inner end extends to the central area and connects with the upper end of the inclined groove, while the outer end runs through the edge of the tread and connects with the inclined groove; Through, the near inner end of the transverse groove at the lower end is penetrated, and the bending part extends to the junction line between the central area and the transition area; inclined grooves, transverse grooves and branch grooves divide the tread into central pattern blocks, transitional Pattern blocks and shoulder pattern blocks.

The included angle between the inclined groove and the tire circumferential centerline is less than 45°.

The transverse grooves are interspersed between the oblique grooves, and the distance between the inner ends of the grooves and the circumferential centerline of the tire after the two are interpenetrated is 30% to 45% of the central area width.

The edge of the central pattern block is in the shape of continuous zigzag or concave-convex drop, while the transition pattern block and the shoulder pattern block are irregular polygons, and the orientation of the transition pattern block and the shoulder pattern block is consistent with the advancing direction of the tire .

The sharp protruding part of the central pattern block is provided with a short groove parallel to its edge, and the short groove is an inverted triangular pyramid.

The depth of the short grooves is 30% to 50% of the depth of the oblique or branch grooves.

A connecting rib is arranged between the concave part of the central pattern block and the transition pattern block.

The section of the connecting rib is stepped, wherein the top of the connecting rib is a first step, and the base is a second step.

The height of the connecting rib is set to be greater than 50% of the depth of the inclined groove or the branch groove, wherein the height of the first step is 30% to 70% of the height of the connecting rib; and the length of the first step is set to 30% to 70 % of the length of the second step.

The transition blocks are configured with shallow grooves.

The shoulder block is provided with a shallow groove conforming to the advancing direction of the tire, and the shallow groove is inclined downward from the bottom of the transverse groove and runs through the edge of the tread.

The total land ratio of the tread pattern of the tire is maintained at 60% to 70%, wherein the land ratio in the central area is 85% to 95%, the land ratio in the transition area is 55% to 65%, and the land ratio in the shoulder area is 50%~60%.

After adopting the above scheme, the utility model optimizes the tire tread pattern design method according to the actual use requirements of electric bicycles, divides the tire tread into several regions, and configures appropriate pattern combinations and land ratios according to the different functions of each region of the tread. In order to achieve the premise of not losing the rolling resistance performance, effectively improve the grip performance, wear performance, drainage performance and cornering safety, so that the overall performance of the tire is superior.

Description of drawings

Fig. 1 is the sectional schematic diagram of electric bicycle tire;

Fig. 2 is a schematic diagram of the first group of inclined pattern grooves of the tread pattern of the tire of the present invention;

Fig. 3 is a schematic diagram of the second group of transverse grooves of the tread pattern of the tire of the present invention;

Fig. 4 is a schematic diagram of the combination of the first group of longitudinal grooves and the second group of transverse grooves of the tread pattern of the tire of the present invention;

Fig. 5 is a schematic diagram of the third group of branch grooves of the tread pattern of the tire of the present invention;

Fig. 6 is a combined schematic diagram of the first group of longitudinal grooves, the second group of transverse grooves, and the third group of branch grooves of the tread pattern of the tire of the present invention;

Fig. 7 is a schematic diagram of the tread pattern configuration of the tire of the present invention;

Fig. 8 is A-A' sectional view of Fig. 7;

Fig. 9 is B-B' sectional view of Fig. 7;

Fig. 10 is a three-dimensional appearance view of the tire of the present invention.

Drawing No.:

Tire 1 Tread 10 Inclined Groove 11

Transverse groove 12 Branch groove 13 Central pattern block 20

Transition pattern block 21 Shoulder pattern block 22.

Detailed ways

Below in conjunction with accompanying drawing 1-10 explain the specific embodiment of the present utility model:

As shown in Figure 1 is the electric bicycle tire 1 of the present utility model, which divides the tire tread 10 into three areas on average along the tread arc direction, including a central area A, two symmetrical transition areas B, and two symmetrical shoulder areas c. Generally, the electric bicycle tire filled with standard air pressure mainly contacts the central area A when driving straight. Because the electric bicycle usually has a small turning angle and the driving speed is not too high, the transition area B is the main contact between the tire and the ground when turning, and the shoulder area C is only touched when turning sharply.

As shown in Fig. 2 to Fig. 6, the electric bicycle tire of the present invention is provided with several oblique pattern grooves 11 uniformly distributed on both sides of the circumferential centerline of the tread 10, and between two adjacent oblique pattern grooves 11 There are transverse grooves 12, and branch grooves 13 are arranged between each transverse groove 12 and the oblique groove 11; the upper end of the oblique groove 11 extends to the central area A, and the lower end runs through the edge of the tread. It should be noted that: The upper and lower ends here are defined by the direction in which the tire advances, and the upper end of the inclined groove 11 is gradually widened toward the lower end; the transverse groove 12 is designed in a V shape, and its inner end extends to the central area A and the inclined The upper end of the pattern groove 11 penetrates, while the outer end penetrates the edge of the tread 10 and penetrates the inclined pattern groove 11; the branch pattern groove 13 is designed in an inclined inverted L shape, its upper end penetrates the near middle part of the inclined pattern groove 11, and its lower end is transversely The near inner end of the groove 12 runs through, and the bending part 131 extends to the boundary line between the area A and the area B; after the oblique groove 11, the lateral groove 12 and the branch groove 13, the tread 10 is divided into three main Pattern blocks: central pattern block 20 , transition pattern block 21 , shoulder pattern block 22 (as shown in FIG. 6 ).

As shown in FIG. 2 , the oblique grooves 11 arranged on both sides of the circumferential centerline of the tread 10 adopt a high longitudinal design, and form an included angle α with the tire circumferential centerline, and the included angle α is designed to be less than 45°. The inner end of the inclined groove extends to the central area A, the outer end runs through the edge of the tread, and the inner end gradually widens toward the outer end. The high longitudinal angle design of the oblique pattern and the gradually widening design towards the edge of the tread can effectively discharge water and improve the wet performance of the tire.

As shown in Figure 3, the transverse grooves 12 provided on both sides of the circumferential centerline of the tread 10 are interspersed between the oblique grooves 11, and the inner ends of the two grooves connected to each other reach the tire circumferential centerline. A distance L1 (as shown in FIG. 4 ) is formed, and L1 is set to be 30% to 45% of the width of the central area A. If the setting of L1 is too small, the central circumferential pattern of the tread 10 will be cut into small pieces, resulting in too small land ratio in this area, and the circumferential creep deformation of the pattern will be large when the tire runs straight, that is, the rolling resistance will increase; if the setting of L1 is too large, The land ratio in this area is too large, and the grip performance and drainage performance of dry and wet land will be affected.

As shown in FIG. 5 , the branch grooves 13 in the transition region B are arranged between the oblique grooves 11 and the transverse grooves 12, and partly extend to the boundary line between the regions A and B, so as to balance the land ratio of the transition region B, Reduce the occurrence of irregular wear. The tread is divided into the central pattern block 20, the transitional pattern block 21, and the shoulder pattern block 22. The edge of the central pattern block 20 is in the shape of a continuous zigzag or other concave-convex drop. The contact area of the continuous pattern is large, which can Effectively reduce rolling resistance; the serrated edge design enhances the marginal effect of the tire and improves the grip performance of the vehicle; in addition, the transition pattern block 21 and the shoulder pattern block 22 are both irregular polygons, and the direction of the two pattern blocks is set Consistent with the advancing direction of the tire, the drainage performance of the tread pattern is improved.

As shown in Figure 7, in order to further improve the comprehensive performance of the tire, a short groove 20a parallel to the edge is provided on the sharp protruding part 201 of the saw-toothed central pattern block 20, and the short groove 20a adopts an inverted triangular pyramid design (as shown in Fig. 8), the depth h1 of which is 30% to 50% of the depth H of the oblique groove 11 or the branch groove 13 . The setting of the short groove 20a can reduce the stress concentration on the sharp protruding part 201 of the central pattern block 20 and avoid early wear, and the inverted triangular pyramid does not lose the rigidity of the pattern block while reducing the land ratio, that is, it does not affect the rolling resistance performance. The concave part of the central pattern block 20 is relatively weak, and a connecting rib 21a can be arranged between the concave part and the pattern block 21, which is arranged at the bottom of the branch pattern groove 13, and the cross section of the connecting rib 21a is stepped (such as 8 and 9), the top of the connecting rib 21a is a first step 21c, and the base is a second step 21d. The height h2 of the connecting rib 21a is set to be greater than 50% of the depth H of the inclined groove 11 or the branch groove 13, wherein the height h3 of the first step 21c is 30%~70% of the height h2 of the connecting rib 21a; and the first step 21c The length L3 is set to be 30%-70% of the length L2 of the second step 21d. The stepped connecting rib 21a only adds a small amount of weight, but it can significantly improve the boundary strength between the central region A and the transition region B, and improve the overall feel of the tire. Shallow grooves 21b are arranged on the transitional blocks 21, and the shallow grooves 21b can improve the elasticity of the transitional blocks 21, thereby increasing the traction force of the tire and preventing lateral skidding when turning; The shallow groove 22a inclined and running through the edge of the tread 10, the shallow groove 22a follows the advancing direction of the tire, so as to improve the drainage performance of the shoulder region C. Simultaneously, the setting of shallow groove 21b, 22a has all reduced tire weight.

In addition, the fine pattern group 22b can be arranged on the surface of the transition block 21 or the shoulder pattern block 22. The fine pattern group is a triangular pyramid, a quadrangular pyramid, etc., which can roughen the surface of the pattern block, so as to improve the sharp turning or High-speed cornering grip performance increases driving safety.

Based on the above design, the total land ratio of the tread pattern 10 of the tire of the present utility model (the ground contact surface area on the surface of the pattern block is used as the land area, the groove area of the pattern block is used as the ocean area, and the land ratio is the contact surface area on the surface of the pattern block and the area of the land. The proportion of the total area of the region) should be maintained at: 60%~70%. And, configure the optimal land ratio of each region of the tread 10 respectively as follows:

Central area A: 85%~95%

Transition area B: 55%~65%

Shoulder area C: 50%~60%

The scheme disclosed by the tire of the utility model can not only be used as a structural improvement of electric bicycle tires, but also can be used as bicycle tires, and both can achieve the aforementioned use effects.

Example:

The following uses the embodiment to describe in further detail.

Tire specification: 16X1.95

The following table shows the results obtained by testing and comparing the design of the existing electric bicycle tire pattern with the tire of the utility model. The index value is used as the evaluation standard. The larger the value, the better the performance.

The key point of the utility model is to optimize the tire tread pattern design method, divide the tire tread into several regions, and configure appropriate pattern combinations and land ratios according to the different functions of each region of the tread.

Claims (12)

1. automobile-used air-inflation tyre of electrical salf-walking, the transitional region of two symmetries that tire contacts with ground when the central area that its tyre surface contacts with ground when comprising a normal wind pinch roller tire straight-line travelling, turning, the two symmetrical shoulder zone that tire contacts with ground when reaching turn sharp, it is characterized in that: be provided with several uniform inclination grooves in the both sides of the circumferential line of centers of tyre surface, be provided with cross groove between the adjacent two inclination grooves, between each cross groove and inclination groove, be provided with branch's groove; This inclination groove upper end extends to the central area, and tread edge is run through in the lower end, and the upside down end of inclination groove is the design that broadens gradually; The upper end that the design that is in the shape of the letter V of this cross groove, its inner extend to central area and inclination groove connects, and tread edge and the perforation of inclination groove are run through in the outer end; This branch's groove is the inverted L shape design of inclination, and its upper end connects with the nearly middle part of inclination groove, and the nearly inner end of its lower end cross groove connects, and kink extends to the boundary line of central area and transitional region; Inclination groove, cross groove and branch's groove are divided into core piece, transition pattern block and pattern block on tire shoulder with tyre surface.

2. the automobile-used air-inflation tyre of electrical salf-walking as claimed in claim 1, it is characterized in that: the angle of described inclination groove and the circumferential line of centers of tire is less than 45 °.

3. the automobile-used air-inflation tyre of electrical salf-walking as claimed in claim 1 or 2, it is characterized in that: described cross groove interts between the inclination groove, and the inner distance to the circumferential line of centers of tire of the groove after the mutual perforation of the two is 30% ~ 45% central area width.

4. the automobile-used air-inflation tyre of electrical salf-walking as claimed in claim 1, it is characterized in that: described core block edge is continuous zig-zag or the shape of concavo-convex drop, and transition pattern block, pattern block on tire shoulder are the fitfull polygon, and transition pattern block, pattern block on tire shoulder to move towards setting consistent with the working direction of tire.

5. such as claim 1 or the automobile-used air-inflation tyre of 4 described electrical salf-walkings, it is characterized in that: the sharp-pointed outshot of described core piece is provided with the with it parallel short ditch in edge, and this short ditch is the inverted triangle cone.

6. the automobile-used air-inflation tyre of electrical salf-walking as claimed in claim 5 is characterized in that: the degree of depth of described short ditch is 30% ~ 50% inclination groove or the degree of depth of branch's groove.

7. the automobile-used air-inflation tyre of electrical salf-walking as claimed in claim 4 is characterized in that: between described core piece recessed portion and the transition pattern block connection rib is set.

8. the automobile-used air-inflation tyre of electrical salf-walking as claimed in claim 7, it is characterized in that: the cross section of described connection rib is step, and wherein the top of connection rib is first step, and base portion is second step.

9. the automobile-used air-inflation tyre of electrical salf-walking as claimed in claim 8 is characterized in that: the height of described connection rib is set to greater than 50% inclination groove or the degree of depth of branch's groove, and wherein the height of first step is 30% ~ 70% of connection rib height; And first step length is set to the length of 30% ~ 70% second step.

10. the automobile-used air-inflation tyre of electrical salf-walking as claimed in claim 1 is characterized in that: described transition pattern block configuration shallow ridges.

11. the automobile-used air-inflation tyre of electrical salf-walking as claimed in claim 1 is characterized in that: dispose the shallow ridges of complying with the tire working direction on the described pattern block on tire shoulder, this shallow ridges is downward-sloping and run through tread edge from cross groove bottom.

12. the automobile-used air-inflation tyre of electrical salf-walking as claimed in claim 1, it is characterized in that: the total land of the tread contour of described tire ratio maintains 60% ~ 70%, wherein the land of central area ratio is 85% ~ 95%, and the land ratio of transitional region is 55% ~ 65%, and the land ratio of shoulder zone is 50% ~ 60%.

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