CN105597285A - Basketball - Google Patents

Abstract

The invention provides a basketball. The basketball comprises a liner, a winding yarn, a middle tire, a surface layer and an air nozzle, wherein a balance cushion block for guaranteeing that the gravity center of the basketball is approximately overlapped on the circle center is arranged on the circumference, which is on the opposite side of the air nozzle, on the inner side of the liner; the roundness of the basket wound by the yarn is controlled to a radius difference which is smaller than or equal to 1.0%; concave and convex patterns are uniformly arranged on the surface layer; and the convex parts of the concave and convex patterns are oval. According to the technical scheme, the gravity center of the basketball is approximately overlapped on the sphere center of the basketball by using a gasket, so that the basketball keeps good stability in a spinning process; the basketball is wound by the yarn so that the roundness of the basket is controlled to the radius difference which is smaller than or equal to 1.0%; and the patterns of the surface layer are oval so that the accuracy and the aerodynamic property of the basketball are improved.

Description

A kind of basketball

Technical field

The present invention relates to a kind of sports goods, refer in particular to a kind of basketball.

Background technology

Current basketball construction comprises inner bag, twines yarn, middle tire, epidermis and valve, valve is arranged on monolateral, the decorative pattern of epidermis mostly also is irregular polygon, the monolateral deviation of gravity center centre of sphere that can cause basketball that arranges of valve, look for the balance of basketball center of gravity and increased certain difficulty to the follow-up yarn process that twines, the circularity of basketball also has certain difference, at present the basketball of epidermis decorative pattern, in the time of shooting, move also comparatively unstable, lowered the precision of shooting.

Summary of the invention

The invention solves above-mentioned technical problem, the basketball that a kind of precision is high and aerodynamic performance is good is provided.

In order to solve the problems of the technologies described above, technical scheme of the present invention is: a kind of basketball, comprise inner bag, twine yarn, middle tire, epidermis and valve, on the circumference on inner side of liner valve opposite, be provided with the approximate balance cushion block that overlaps the center of circle of a guarantee basketball center of gravity, twine the circularity of basketball after yarn and be controlled at semidiameter≤1.0%, uniform ridge design on described epidermis, the part ovalize of said ridge design projection.

Further, the oval-shaped major semiaxis of described ridge design is of a size of a, and semi-minor axis is of a size of b, and the size range of a is between 1mm-3.5mm, and the size range of b is between 0.5mm-2.5mm.

Further, the ellipse of described ridge design is evenly spaced.

Preferably, described balance gasket adopts bipeltate.

Further, even many, interval groove on described epidermis.

Technical scheme of the present invention, utilize balance gasket that the centre of sphere of the center of gravity of basketball and basketball is approximate overlapping, give basketball good stability in rotary course, the circularity of guaranteeing basketball by twining yarn reaches semidiameter≤1.0%, the decorative pattern of epidermis adopts oval, improves precision and the aerodynamic performance of basketball.

Brief description of the drawings

Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.

Fig. 1 basketball construction schematic diagram of the present invention;

Fig. 2 is epidermis ridge design figure of the present invention;

Fig. 3 is the resistance broken line graphs of three balls of the present invention in the time not rotating;

Fig. 4 is the resistance broken line graphs of three balls of the present invention in the time of turn/s of rotary speed 1;

Fig. 5 is the resistance broken line graphs of three balls of the present invention in the time of turn/s of rotary speed 2;

Fig. 6 is the resistance broken line graph of A ball under three kinds of rotary speeies;

Fig. 7 is the resistance broken line graph of B ball under three kinds of rotary speeies;

Fig. 8 is the resistance broken line graph of basketball of the present invention (C ball) under three kinds of rotary speeies;

Fig. 9 is the side force broken line graphs of three balls of the present invention in the time not rotating

Figure 10 is the side force broken line graphs of three balls of the present invention in the time of turn/s of rotary speed 1

Figure 11 is the side force broken line graphs of three balls of the present invention in the time of turn/s of rotary speed 2

Figure 12 is the side force broken line graph of A ball under three kinds of rotary speeies;

Figure 13 is the side force broken line graph of B ball under three kinds of rotary speeies;

Figure 14 is the side force broken line graph of basketball of the present invention (C ball) under three kinds of rotary speeies.

Detailed description of the invention

Below in conjunction with the drawings and specific embodiments, the present invention will be further described.

As shown in Figure 1 basketball comprise inner bag 1, twine yarn 2, middle tire 3, epidermis 4 and valve 5, on the circumference on inner bag 1 inner side valve 5 opposites, be provided with the approximate balance cushion block 6 that overlaps the center of circle of a guarantee basketball center of gravity, twine the circularity of basketball after yarn and be controlled at semidiameter≤1.0%, the weight of balance gasket 6 is identical with the weight of the pad of valve 5 belows, and preferred balance gasket 6 adopts bipeltate.

Uniform ridge design on epidermis 4 as shown in Figure 2, the part ovalize of said ridge design projection, the oval-shaped major semiaxis of ridge design is of a size of a, semi-minor axis is of a size of b, and the size range of a is between 1mm-3.5mm, and the size range of b is between 0.5mm-2.5mm, the ellipse of illustrated embodiment ridge design is evenly spaced, oval-shaped arrangement and the size of space are not limited to shown in diagram, also can be provided with evenly spaced many grooves on epidermis, improve the feel of basketball.

Fig. 3-Figure 14 is that basketball of the present invention and commercially available basketball A and B have done basketball Wind Tunnel Data and embody, wherein A basketball is without cushion block, the ridge design of epidermis is comparatively dense polygon, B basketball is without cushion block, the ridge design of epidermis is loose polygon, in basketball diagram of the present invention, be C, by basketball wind tunnel experiment, at specific air, under specific speed, basketball is the relation between suffered power and feature area aloft, experimental selection low-speed wind tunnel, the parameter of selecting: air velocity is selected between 5-15m/s, interval 1m/s, the controllability of basketball when the air force situation major embodiment of basketball between 5-10m/s shot, the controllability of basketball movement track when the air force situation major embodiment of basketball between 10-15m/s passed fast, basketball is rotated around the axle of vertical bottom face, and rotary speed fixes on 0,1,2 turn/s, and different rotation status carries out dynamometry analysis, checks that the side force that basketball brings due to rotation under different air velocities changes.

Fig. 3 is the comparison of A, B, tri-balls of C resistance under different rotating speeds to Fig. 5, and as can be seen from the figure, along with the increase of speed, the resistance of three balls is the trend of increase, and the resistance difference of three balls is little; When rotary speed is 0 turn/s, C ball at wind speed the resistance during lower than 11m/s smaller, in the time of turn/s of rotary speed 1 and 2 turn/s, three balls at wind speed the resistance difference during lower than 10m/s little, the slightly difference of resistance at wind speed during higher than 10m/s, stability is all good.

Fig. 6 to Fig. 8 is the comparison of this resistance under different rotating speeds separately of A, B, tri-balls of C, can find out the difference of rotary speed, do not bring violent variation to the resistance of three balls, but C ball is in speed, the resistance during lower than 10m/s is not subject to the impact that rotary speed is different.

Fig. 9 to Figure 11 is the comparison of A, B, tri-balls of C side force under different rotating speeds, along with the change of rotary speed, the performance of A, B, tri-ball side forces of C is all not identical, in the time that rotary speed is 0 turn/s, the side force of C ball can be ignored, and the side force performance of A ball and B ball is extremely unstable. The in the situation that of turn/s of rotary speed 1 and 2 turn/s, wind speed is during lower than 10m/s, and the side force of B ball and C ball is all less than the side force of A ball, and wind speed is during higher than 10m/s, and the side force of A ball is less than normal with respect to C ball.

Figure 12 to Figure 14 is this comparison of side force under different rotating speeds separately of A, B, tri-balls of C, rotary speed difference, and it is violent giving the variation of three ball side forces, but the variation of C ball side force during lower than 10m/s in speed is very little.

Can find out in conjunction with above-mentioned experimental data, in the time of shooting, be basketball speed during lower than 10m/s, the suffered resistance of C ball is less, and little with rotary speed relation, suffered side force is relatively little, after pitching, ball kinetic stability is better, and B ball takes second place relatively, but A asks, to be greater than side force after 10m/s in speed lower, in the time that sportsman tells pass, club shows good stability. But the speed of selling when shooting is between 8-10m/s, after selling, be approximate parabolic path and travel forward, due to basketry, to be positioned at 3.05mm high, and the speed that basketball is sold is the highest, thereafter speed is between 5-8m/s, and first and last the aerodynamic performance of C ball is better.

Although specifically show and introduced the present invention in conjunction with preferred embodiment; but those skilled in the art should be understood that; not departing from the spirit and scope of the present invention that appended claims limits; in the form and details the present invention is made a variety of changes, be protection scope of the present invention.

Claims (5)

1. a basketball, comprise inner bag, twine yarn, middle tire, epidermis and valve, it is characterized in that: on the circumference on inner side of liner valve opposite, be provided with the approximate balance cushion block that overlaps the center of circle of a guarantee basketball center of gravity, twine the circularity of basketball after yarn and be controlled at semidiameter≤1.0%, uniform ridge design on described epidermis, the part ovalize of said ridge design projection.

2. a kind of basketball according to claim 1, is characterized in that: the oval-shaped major semiaxis of described ridge design is of a size of a, and semi-minor axis is of a size of b, and the size range of a is between 1mm-3.5mm, and the size range of b is between 0.5mm-2.5mm.

3. a kind of basketball according to claim 1 and 2, is characterized in that: the ellipse of described ridge design is evenly spaced.

4. a kind of basketball according to claim 3, is characterized in that: described balance gasket adopts bipeltate.

5. a kind of basketball according to claim 4, is characterized in that: even many, interval groove on described epidermis.