WO2016000452A1

WO2016000452A1 - Five-spoke large-vent hole steel wheel hub with high ventilation quantity

Info

Publication number: WO2016000452A1
Application number: PCT/CN2015/072381
Authority: WO
Inventors: 肖华; 石磊; 韩非; 张骥超
Original assignee: 宝山钢铁股份有限公司
Priority date: 2014-06-30
Filing date: 2015-02-06
Publication date: 2016-01-07
Also published as: CN104070918A; CN104070918B

Abstract

A five-spoke large-vent hole steel spoke-type hub (100) with high ventilation quantity comprises five identical spokes (1) uniformly distributed in the circumferential direction of the hub (100). Five large vent holes (2) are formed among the spokes (1). Each large vent hole (2) is located between every two spokes (1). The section of the spoke (1) perpendicular to the radial direction of the hub (100) is of a cap-shaped structure. The section of the spoke (1) in the radial direction is asymmetrical inverted U-shaped and formed of a linear section, an arc-shaped section and a diagonal section. The contour line of the spoke (1) perpendicular to the axial direction of the hub (100) is in a left and right bracket shape. The steel hub (100) has a delicate structure and moderate weight; the steel wheel is compared favorably with an aluminum alloy wheel in appearance and weight, and is superior to the aluminum alloy wheel in performance and price; and the cost and the power consumption can be reduced.

Description

Five-spoke high ventilation large ventilated steel wheel spoke

Technical field

The invention relates to the manufacture of automobile parts, in particular to a five-spoke high-ventilation large-ventilation steel wheel spoke.

Background technique

The wheel is an important safety component and appearance part of the car. As a safety component, the wheel is the carrier that bears the weight of the whole vehicle, passengers and cargo. It transmits the acceleration and deceleration of the car, the additional force when turning, and also bears the impact of the flying stone and the pit. Therefore, the wheel needs a certain strength and rigidity. As the appearance of the wheel, the shape and style of the wheel will have a significant impact on the style and effect of the vehicle. The aesthetics of the wheels directly affect the consumer's preference for the model. Therefore, the wheel pays attention to both appearance and performance.

At present, the wheels mainly include steel wheels and aluminum alloy wheels. The aluminum alloy wheels occupy most of the passenger car wheel market due to their beautiful appearance and light weight. The reason is mainly that the aluminum alloy wheels are mainly for casting production. The shape can be varied, and various complex shapes are easily obtained. The appearance of the steel wheel is mainly determined by the spokes. The spokes are stamped, the change is less, and it is not easy to obtain too complicated shapes. At the same time, more importantly, the development of complex shapes When the spokes are beautiful in appearance, it is extremely difficult to ensure that the wheel has sufficient strength and rigidity.

The traditional steel wheel is shown in Fig. 1 and Fig. 3. The spokes are equal-section rotary parts, and a small number of small vent holes are distributed on the rotating surface for ventilation and heat reduction and weight reduction. Compared with the rib structure of the aluminum wheel (as shown in Figure 2), the structure is significantly different in appearance, so the market performance is significantly different from the aluminum wheel, but the steel wheel is superior to the aluminum alloy wheel in strength, cost and energy consumption. If you can develop steel wheels with beautiful appearance and sufficient strength and performance, you will be able to obtain more markets for steel wheels, thus achieving energy saving, emission reduction and cost reduction for the automotive industry. However, there is currently no such product development in China.

Chinese patent CN201010286771.3 discloses a method for manufacturing automobile wheel spokes by using steel pipes, which is produced by a spinning process using steel pipes, and has not been greatly improved in appearance structure. Chinese patent CN200610068833.7 discloses a processing method for high-intensity spokes of heavy-duty vehicles, which is a production process of card wheel spokes which are heated and reshaped first, and is still a traditional spoke structure product.

Chinese Patent No. 200680012150.8 discloses a spoke of a prefabricated vehicle and an assembled wheel including the spoke. The wheel spoke of the patent proposes that the mounting surface has at least one rib having a straight outer surface, and it is not clear whether it is The steel spokes made by stamping do not describe the more specific structural features and dimensions of the spokes. At the same time, the rib having a straight outer surface functions like a reinforcing rib to increase the spoke strength and compensate for the strength loss after the spoke structure is changed, but the rib has a straight side, the depth is deep, and the screw hole is too close, and the stamping forming is extremely difficult. Large, not easy to obtain by stamping. Even if it is obtained, it is easy to reduce the fatigue strength due to the excessive amount of thinning, which poses a great risk to product performance. And the excessively high ribs occupy the space above the spoke mounting plane, which is not conducive to the installation of the spokes.

Chinese Patent No. 200580013225.X proposes a fabricated wheel and a manufacturing method thereof, wherein the main feature of the spoke is that the vent hole has two to three window portions, and must be obtained by multiple piercing (punching) for other structural sizes. No descriptions or requirements have been made. Since the wind hole needs to be obtained twice or even three times, the manufacturing difficulty is increased and the manufacturing efficiency is lowered. Moreover, there are excessive gaps between the punching holes of the wind hole, and the notch is easy to be a source of fatigue crack, which is not conducive to product strength performance.

Chinese Patent No. CN201080048554.9 discloses a spoke for an automobile which ensures the strength of the spokes without increasing the thickness of the raw material plate of the spokes and increasing the decorative hole for the purpose of improving the design. Rigid car spokes. The patented product has multiple layers of different shape cross-section features in the spokes, which can ensure the strength to meet the requirements to the greatest extent, but the V-shaped and approximately square shape features are extremely difficult to be formed by stamping, which is not conducive to actual manufacturing. Moreover, the patented product has too many levels of features and one-week wavy shape, so that the spoke shape is not clean and the appearance effect is not optimal.

The Chinese patent CN200980143310.6 discloses a spoke for an automobile which reduces the amount of protrusion protruding from the curved portion of the decorative hole toward the outside in the direction of the wheel axis to expand the selection range of the specifications of the wheel, and ensures the durability of the spoke and enables the spoke portion The spokes for automobiles that are not compatible with the number and arrangement of the bolt holes of the hub, are easy to tighten the hub nut, and are easy to form the spokes. However, the product is insufficient in strength to compensate for the structural change, and a bulging (protruding) feature is designed in the middle of the spoke to increase the strength, so that the bottom surface of the spoke is not smooth, the smoothness after painting is not good, and the overall appearance of the spoke is damaged. Performance. The ventilating hole boundary of the patented product intersects with the rounded corner of the spoke sidewall, which cuts the integrity of the rounded corner and also damages the appearance. The top rounded surface is easy to leave a sharp corner after removing the wind hole, thus becoming a source of fatigue. , reducing wheel performance. Moreover, the product is designed to increase the strength, and the moving part is designed, but this feature makes the forming difficult and increases. Scrap scrap rate, and due to part of the gap with the rim, it is easy to fall into the debris during the assembly press, affecting the assembly or bringing into the coating line and affecting the quality of the coating.

Summary of the invention

The object of the present invention is to provide five high-ventilation and large-ventilation steel wheel spokes. The steel spoke product structure has a major change compared with the traditional spoke structure, the structure is beautiful, the weight is moderate, and the performance can meet the requirements of the wheel, and finally realize The shape and weight of the steel wheel can be comparable to that of the aluminum alloy wheel, but the performance is superior to that of the aluminum alloy wheel, and the price is cheaper than the aluminum alloy, which reduces the cost and saves energy for the main engine and the end user.

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

A five-spoke, high-ventilation, large-ventilation steel wheel spoke, characterized in that the wheel spoke is a spoke-type structure, and five identical spokes are evenly arranged along the circumferential direction of the spoke, that is, the central axes of the five spokes are equal. 72 degree distribution, five large venting holes are formed between the spokes, and each large venting hole is in the middle of two spokes, that is, the central axis of each large venting hole is at an angle of 36 degrees with the central axis of the adjacent spoke; the spoke is perpendicular to the radial direction of the spoke. The cross section is a hat-shaped structure; the radial cross section of the spoke is an asymmetric inverted U shape, that is, a combined line of a straight line segment + a circular arc segment + a diagonal line segment; the contour line of the spoke perpendicular to the axial direction of the spoke is a left and right bracket shape.

Further, the spoke is perpendicular to the radial direction of the spoke, and has a hat-shaped structure with an inverted shape. The shape of the hat section is 30 mm to 50 mm at the bottom, and the radius of the bottom two corners is 1 mm to 5 mm. The radius is from 3mm to 12mm and the depth is from 12mm to 25mm.

Preferably, the asymmetric inverted U-shaped cross-section of the spoke along the radial section is: the bottom length is 30 mm to 60 mm, and the upper two corners have a radius of 20 mm to 30 mm, a depth of 50 mm to 65 mm, and a side wall angle of the oblique line segment. It is 35 degrees to 45 degrees.

Moreover, the contour of the spoke perpendicular to the axial direction of the spoke is an embracing shape or a left and right bracket shape, and the rounded corners on both sides are tapered rounded corners, and the maximum rounded corner gradually transitions to no rounded corners, and the radius of the rounded corner is 3 to 12 mm.

Preferably, the large venting hole is composed of a 4-segment arc + a 2-segment straight segment, and each adjacent line is tangent; wherein the first arc corresponds to the axle hole side, and the first and second straight segments are respectively connected a second arc and a fourth arc are respectively connected to the first and second straight segments, and the third arc is connected to the second and fourth arcs; and the first and second straight segments are opposite to the spoke sidewall The angle is ≤5 degrees, and the side arc edge is 3~5mm; the first arc radius is 30mm~70mm, the second and fourth The radius of the arc is the same, the size ranges from 10mm to 20mm; the third arc is tangent to the outer edge of the spoke, and the radius is 90-100mm.

Preferably, the large venting hole is formed by a 4-segment arc + a 2-segment straight segment, wherein the first arc corresponds to the axle hole side, and the first and second straight segments are respectively connected to the first arc ends, Second, the fourth arc is respectively connected to the first and second straight segments, and the third arc is connected to the second and fourth arcs; and the third arc is on the rim, and the adjacent lines are tangent to each other, first The second straight line segment is at an angle of <=5 degrees to the side wall of the spoke, and is 3 to 5 mm from the side edge of the side wall; the third arc is parallel to the outer edge of the spoke, and the radius is the same; the first arc The radius is 30mm to 70mm, the second and fourth arcs have the same radius, and the radius is 5mm to 15mm.

In addition, the spoke mounting plane is evenly distributed with five air guiding and water guiding grooves, and the groove shape is a cylindrical surface or a tapered surface, and the groove cross section is gradually reduced from the inner side to the outer side in the radial direction, and the vertical axis is vertical. The cross section is U-shaped.

Preferably, the wheel spokes are stamped from a high-strength steel plate having a thickness of 4.0 mm to 6.0 mm and a tensile strength of ≥600 MPa.

Preferably, the ventilation area of the large ventilation hole is >70 cm ² , and the total ventilation area of the five large ventilation holes is >350 cm ² .

In view of the disadvantages of steel wheels relative to aluminum wheels, the present invention proposes a new structure of steel wheel spokes, which can greatly improve the appearance of steel wheels, and the fatigue performance meets the requirements. The new structure of five high-ventilation and large ventilated steel wheels is characterized by changing the structure of small ventilating holes on the curved surface of the traditional steel wheel spokes, and developed into a spoke-type, large ventilating, high-ventilation new structure. There are five spokes with uniform shape and equal division, and a high ventilation and large ventilation hole are distributed between the spokes. The five high ventilation and large ventilation holes have a specific shape, the same, and a uniform distribution. Five high-ventilation large vent spokes are manufactured by stamping.

In the design of the spokes of the present invention:

The spokes are spoke-shaped structures with five identical spokes. The spoke-like structure makes the overall wheel look more powerful and rigid.

The spokes of the present invention have a large venting structure and have five large venting holes. The large venting holes make the overall wheel spokes look more boney, and the large venting holes ensure that the spoke product weight is as light as possible.

The five large vents ensure high spoke venting and improve brake cooling. It should be as large as possible on the basis of guaranteed strength.

The five spokes are evenly distributed in one week, that is, the central axis of the five spokes is equal to 72 degrees, as shown in the following figure. Show.

Each spoke has a certain shape along the radial, vertical radial, and vertical axes of the spoke to ensure sufficient fatigue performance to ensure aesthetics.

The spokes are hat-shaped in a section perpendicular to the radial direction, and have an asymmetric U-shape in the radial section (a combined line of a straight line + an arc + a diagonal line), and the vertical axial contour is an embracing shape, or a left-right bracket. The combination of the cross-sections in the above directions constitutes the spoke structure, that is, the shape of the spoke spokes is ensured to be sufficiently beautiful, and the spokes are ensured to have sufficient strength and fatigue performance when removing a large number of ventilation holes.

The spoke of the invention has an axially embracing shape, is more dynamic, and is beneficial for transmitting loads, thereby ensuring better wheel fatigue life. The R rounded corners on both sides are tapered rounded corners, which gradually transition from the maximum rounded corner to the outer edge without the rounded corners. The radius of the rounded corner is 3~12mm.

The five large vents can be as large as possible to ensure high ventilation, where each vent has an area of >70 cm ² and a total venting area of >350 cm ² .

Five air guiding and water guiding grooves are uniformly arranged on the spoke mounting plane, and the shape of the groove may be various surfaces such as a cylindrical surface and a tapered surface. Moreover, in order to ensure that the mounting plane has a sufficient area, the groove section is gradually reduced in the radial direction from the inside to the outside, and the vertical axial section is U-shaped.

Advantageous effects of the present invention

The invention proposes a brand-new five high-ventilation and large-ventilation steel wheel spokes. The new type of spokes have a great change in the outer structure and the shape is greatly improved, so that the five high ventilations of the spokes are adopted. The steel wheel has a beautiful appearance, which is comparable to the shape of the aluminum wheel to a certain extent, and at the same time, sufficient strength and rigidity are ensured by the complicated spoke structure. The new wheel is made of high-strength steel with large venting holes and the shape and weight are close to the aluminum wheel. Therefore, the new wheel can be used to replace the aluminum wheel, thereby achieving energy saving and cost reduction.

DRAWINGS

Figure 1 is a photograph of a conventional steel wheel.

Figure 2 is a photograph of a ribbed structure of an aluminum wheel.

3 is a schematic view showing the structure of a conventional wheel spoke.

Figure 4 is a front elevational view of the spoke of the present invention.

Figure 5 is a perspective view of five high ventilation and large ventilating spokes of the present invention.

Figure 6 is a front elevational view of five high ventilation, large vent spokes of the present invention.

Fig. 7 is a cross-sectional view taken along line A-A of Fig. 2;

Fig. 8 is a cross-sectional view taken along line B-B of Fig. 2;

Fig. 9 is a cross-sectional view taken along line C-C of Fig. 2;

Figure 10 is an enlarged schematic view of five high ventilation and large ventilation holes of the present invention.

Figure 11 is a diagram showing the installation of five new high-ventilation venting new steel spokes of the present invention.

Figure 12 shows the original standard aluminum alloy wheels.

detailed description

Referring to Figures 4-11, the five-spoke, high-ventilation, large-ventilation steel wheel spoke 100 of the present invention has a spoke-like structure in which five identical spokes 1 are uniformly disposed along the circumferential direction of the spoke (with spokes) 1 for example, the same below), that is, the central axis of the five spokes is equal to 72 degrees, and five large ventilation holes 2 are formed between the spokes (taking the large ventilation holes 2 as an example, the same below), and each large ventilation hole 2 is at In the middle of the two spokes, that is, the central axis of each large venting hole 2 is at an angle of 36 degrees with the central axis of the adjacent spoke 1; the radial section of the spoke 1 perpendicular to the spoke 100 is a hat-shaped structure (as shown in FIG. 8); spokes 1 The radial section is an asymmetrical inverted U shape (as shown in FIG. 9), that is, a combination line of a straight line segment + a circular arc segment + a diagonal line segment; the contour line of the spoke perpendicular to the axial direction of the spoke is an embracing shape or a left and right bracket shape.

Further, the spoke 1 is perpendicular to the radial direction of the spoke 100 and has a hat-shaped structure with an inverted buckle. As shown in FIG. 8 , the shape of the hat section is: the width W of the bottom is 30 mm to 50 mm, and the radius of the bottom two rounded corners. R1 is 1 mm to 5 mm, and the radius R2 of the top two rounded corners is 3 mm to 12 mm, and the depth H1 is 12 mm to 25 mm.

As shown in FIG. 9, the asymmetric inverted U-shaped cross-sectional dimension of the spoke 1 in the radial section is: the bottom length L1=30 mm-60 mm, and the upper two corner radiuses are 20 mm to 30 mm, and the depth H2=50 mm. 65 mm, the side wall of the diagonal line segment L2 is at an angle of 35 to 45 degrees with respect to the vertical direction.

Moreover, the contour of the spoke 1 perpendicular to the axial direction of the spoke 100 is an embracing shape or a left and right bracket shape, as shown in FIG. 10, the rounded corners on both sides are gradually rounded, and the maximum rounded corner gradually transitions to no round. The corner, the maximum radius of the fillet is 3 ~ 12mm.

Referring to FIG. 10, the large venting hole 2 is formed by a 4-segment arc + a 2-segment straight line segment, and each adjacent line is tangent; wherein the first circular arc 21 corresponds to the axle hole side, and the first and second straight segments are 22, 23 are respectively connected to the two ends of the first arc 21, the second and

fourth arcs

24, 25 are respectively connected to the first and second

straight segments

22, 23, and the third arc 26 is connected to the second and fourth arcs 24 25; and, first, The second

straight line segments

22, 23 are at an angle of ≤ 5 degrees to the side wall of the spoke, such as parallel or approximately parallel, and are 3 to 5 mm from the side edge of the side wall; the first arc 21 has a radius of 30 mm to 70 mm, second. The

fourth arc

24 and 25 have the same radius and the size ranges from 10 mm to 20 mm; the third arc 26 is tangent to the outer edge of the spoke 100, and the radius is 90-100 mm.

Preferably, the large venting hole 2 is formed by a 4-segment arc + a 2-segment straight line segment, wherein the first circular arc 21 corresponds to the axle hole 101 side, and the first and second

straight segments

22, 23 are respectively connected to the first The second and

fourth arcs

24, 25 are respectively connected to the first and second

straight segments

22, 23, and the third arc 26 is connected to the second and

fourth arcs

24, 25; and, the third The arc 26 is on the rim, and the adjacent lines are tangent to each other, and the first and second

straight segments

22 and 23 are at an angle of <=5 degrees to the side wall of the spoke, and are 3 to 5 mm from the side edge of the side wall; The three arcs 26 are parallel to the outer edge of the spoke and have the same radius; the first arc 21 has a radius of 30 mm to 70 mm, and the second and

fourth arcs

24 and 25 have the same radius, and the radius is 5 mm to 15 mm.

In addition, the spokes 1 are uniformly arranged with five air guiding and water guiding grooves 3 on the mounting plane, and the grooves 3 are in the shape of a cylindrical surface or a tapered surface, and the cross section of the groove 3 is gradually reduced from the inside to the outside in the radial direction. The vertical axial section is U-shaped.

Preferably, the ventilation area of the large ventilation hole 2 is >70 cm ² , and the total ventilation area of the five large ventilation holes 2 is >350 cm ² .

One of the best-selling models is equipped with aluminum wheels. The five high-ventilation and large-ventilation steel wheels proposed by the present invention are made of 5.5mm DP600.

The material used for the spoke of the invention is a high-strength steel plate, and the tensile strength is ≥600 MPa. In order to ensure sufficient strength, the thickness must be 4.0 mm to 6.0 mm. The five high-ventilation and large-ventilation steel wheel spokes using the spokes have a total weight of about 4.5 to 6 kg.

As shown in Fig. 11, the five new wheels of the new high-ventilation ventilated new steel spokes of the present invention are installed. Figure 12 shows the original standard aluminum alloy wheels.

It can be seen from the figure that the new steel wheel of the invention is close to the aluminum alloy wheel in the shape performance, the strength requirement satisfies the original design requirement, and, after evaluation, the procurement cost of the main engine factory can be reduced by 1/3 to 1/2.

As the competition in China's auto industry intensifies, the requirements for performance, reduction, and energy conservation are getting higher and higher. At present, the domestic passenger car market, despite the performance of steel wheels, procurement costs, energy consumption for manufacturing, recycling, etc. Both are better than aluminum alloy wheels, but steel wheels are due to manufacturing process and fatigue. The reason for the request is extremely difficult to achieve the aesthetic and variability of the aluminum alloy wheels, and the steel wheel market has been shrinking. Aluminum alloys occupy most of the market by virtue of their beautiful and changeable shape. Therefore, the development of steel wheels with the shape comparable to aluminum alloy wheels has become the bottleneck for the development of the steel wheel market. Prior to the present invention, there was no relevant steel wheel product development in China.

By adopting the steel wheel of the steel wheel spoke of the invention, the shape can be close to the aluminum alloy wheel, and can still meet the performance requirements of wheel fatigue, thereby being able to replace the aluminum alloy wheel, thereby assisting the main engine factory to achieve performance improvement and procurement cost. Reduced, reduced manufacturing energy consumption, and ultimately achieved energy saving and environmental protection, and the products are better and cheaper.

Claims

A five-spoke, high-ventilation, large-ventilation steel wheel spoke, characterized in that the wheel spoke is a spoke-type structure, and five identical spokes are evenly arranged along the circumferential direction of the spoke, that is, the central axes of the five spokes are equal. 72 degree distribution, five large venting holes are formed between the spokes, and each large venting hole is in the middle of two spokes, that is, the central axis of each large venting hole is at an angle of 36 degrees with the central axis of the adjacent spoke; the spoke is perpendicular to the radial direction of the spoke. The cross section is a hat-shaped structure; the radial cross section of the spoke is an asymmetric inverted U shape, that is, a combined line of a straight line segment + a circular arc segment + a diagonal line segment; the contour line of the spoke perpendicular to the axial direction of the spoke is a left and right bracket shape.
The five-spoke high-ventilation and large-ventilation steel wheel spoke according to claim 1, wherein the spoke is perpendicular to the radial direction of the spoke, and the hat-shaped cross-sectional dimension is: The bottom width is 30mm ~ 50mm, the radius of the bottom two round corners is 1mm ~ 5mm, the radius of the top two round corners is 3mm ~ 12mm, the depth is 12mm ~ 25mm.
The five-spoke high-ventilation and large-ventilation steel wheel spoke according to claim 1 or 2, wherein the asymmetric inverted U-shaped cross section of the spoke in the radial section is: the bottom length is 30 mm to 60 mm, The upper two corners have a radius of 20 mm to 30 mm and a depth of 50 mm to 65 mm, and the side wall angle of the oblique line segment is 35 to 45 degrees.
The five-spoke high-ventilation and large-ventilation steel wheel spoke according to claim 1 or 2 or 3, wherein the spokes are perpendicular to the axial direction of the spoke, and the left and right brackets are rounded on both sides. For the gradient fillet, the transition from the maximum fillet to no fillet, the maximum radius of the fillet is 3 ~ 12mm.
The five-spoke high-ventilation and large-ventilation steel wheel spoke according to claim 1 or 2 or 3 or 4, wherein the large vent hole is formed by a 4-segment arc + a 2-segment straight line segment, each of which The adjacent lines are tangent; wherein the first arc corresponds to the side of the axle hole, the first and second straight segments are respectively connected to the two ends of the first arc, and the second and fourth arcs are respectively connected to the first and second straight segments, The third arc is connected to the second and fourth arcs; and the angle between the first and second straight segments and the spoke sidewall is ≤5 degrees, and the side arc edge is 3 to 5 mm; the first arc radius is 30mm ~ 70mm, the second and fourth arcs have the same radius, the size range is 10mm ~ 20mm; the third arc is tangent to the outer edge of the spoke, the radius is 90 ~ 100mm.
Five-spoke high-ventilation large ventilated steel wheel wheel according to claim 1 or 2 or 3 or 4 The spoke is characterized in that: the large venting hole is composed of a 4-segment arc + a 2-segment straight segment, wherein the first arc corresponds to the axle hole side, and the first and second straight segments are respectively connected to the first arc The second and fourth arcs are respectively connected to the first and second straight segments, the third arc is connected to the second and fourth arcs; and the third arc is on the rim, and the adjacent lines are tangent to each other. The first and second straight line segments are at an angle of <=5 degrees to the side wall of the spoke, and are 3 to 5 mm from the side edge of the side wall; the third arc is parallel to the outer edge of the spoke, and the radius is the same; The radius of a circular arc is 30 mm to 70 mm, and the radius of the second and fourth arcs is the same, and the radius is 5 mm to 15 mm.
The five-spoke high-ventilation and large-ventilation steel wheel spoke according to any one of claims 1 to 6, wherein the spoke mounting plane is uniformly distributed with five air guiding and water guiding grooves, The groove shape is a cylindrical surface or a tapered surface, and the groove cross section gradually decreases from the inner side to the outer side in the radial direction, and the vertical axial section is U-shaped.
The five-spoke high-ventilation and large-ventilation steel wheel spoke according to claim 1 or 5 or 6, wherein the large ventilation hole has a ventilation area of >70 cm 2 and a total ventilation area of five large ventilation holes. Is >350cm 2 .
The five-spoke high-ventilation and large-ventilation steel wheel spoke according to any one of claims 1 to 8, wherein the wheel spoke adopts a thickness of 4.0 mm to 6.0 mm and a tensile strength of ≥ 600 MPa. High-strength steel plate is stamped.