The present invention relates to the technical field of vehicles, and more particularly, to a vehicle-used crankset composite structure.
A bicycle is a lightweight vehicle that is human-powered and pedal-driven. The drivetrain begins with pedals which rotate the chain and the crankset, enabling the wheels to rotate to move the bicycle forward. In the prior art, the bicycle crankset is integrally molded, and the molding material is usually made of hard iron. Along with the trend of lightweight design. Traditional iron-made cranksets are gradually being replaced by the crankset made from aluminum alloy.
Although aluminum alloy has a light weight, it is less durable than traditional iron cranksets. Furthermore, the fatigue performance of aluminum alloy is far lower than steel. A steel-made crankset can bear an infinite cyclic load. However, the fatigue limit of aluminum alloy is near zero, meaning that a very small cyclic load can damage the crankset made from aluminum alloy. During the movement, the point where the tooth portions of the crankset and the bicycle chain are engaged can easily be worn off. Consequently, the functional life of the crankset can be sharply decreased if the rigidity and the wear-resistance of the tooth portions are not high enough.
Thus, keeping the high rigidity and wear-resistance of the tooth portions as well achieving a lightweight crankset structure are urgent problems that need to be solved for those skilled in this field.
The purpose of the present invention is to solve the shortcomings in the prior art, and provide a vehicle-used crankset composite structure.
To achieve the above purpose, the present invention adopts the following technical solution:
A vehicle-used crankset composite structure, comprising an inner ring piece made from a lightweight metal. The inner ring piece is hollow-cored, and the inner surface of the inner ring piece is equally divided and extends to form a plurality of fixing portions in the radial direction. A first joint surface is disposed on the inner ring piece. The vehicle-used crankset composite structure further comprises a rigid tooth ring having a high wear-resistance and heat-resistance. A plurality of annular bodies is formed on the outer side of the tooth ring, and each annular body is formed between two tooth portions. An inner ring hole is provided in the middle of the tooth ring. A second joint surface is disposed on the tooth ring. Through fixing the second joint surface to the first joint surface via welding, the inner ring piece can be fixed into the tooth ring and cover the inner ring hole of the tooth ring.
In another aspect of the present invention, the vehicle-used crankset composite structure mainly comprises an inner ring piece made from a lightweight metal. The inner ring piece is hollow-cored, and the inner surface of the inner ring piece is equally divided and extends to form a plurality of fixing portions in the radial direction. A first joint surface is disposed on the inner ring piece. The vehicle-used crankset composite structure further comprises a tooth ring. A plurality of tooth portions is formed on the outer side of the tooth ring. An inner ring hole is provided in the middle of the tooth ring. A second joint surface is disposed on the tooth ring, which is welded to the first joint surface, enabling the inner ring piece to be fixed into the tooth ring to cover the inner ring hole of the tooth ring.
In another aspect of the present invention, the outer surface of the inner ring piece is provided with a first joint surface, and the inner surface of the inner ring hole of the tooth ring is provided with a second joint surface. The inner ring piece is fixed in the inner ring hole of the tooth ring. The first joint surface is fixed to the second joint surface via welding. The inner ring piece and the tooth ring are disposed in the same horizontal plane.
In another aspect of the present invention, a first joint surface is disposed on one side surface of the inner ring piece which faces towards the tooth ring. A second joint surface is disposed on one side surface of the tooth ring. The inner ring piece is stacked on the second joint surface of the tooth ring through the first joint surface. The inner ring piece is fixed to the tooth ring via welding.
In another aspect of the present invention, the first joint surface of the inner ring piece is disposed on a protruding step structure of the outer edge of the inner ring piece. A first engaging portion, which is disposed along the outer surface of the inner ring piece, is disposed at the point where the protruding step structure is located. The second joint surface of the tooth ring is disposed on a step structure which is located on the fracture surface of the inner ring hole. A second engaging portion, which is disposed on the second joint surface, is disposed along the inner surface of the tooth ring to correspond to the first engaging portion. The inner ring piece uses the first engaging portion to engage with the second engaging portion. The first engaging portion and the second engaging portion stay in the same horizontal plane, enabling the first joint surface to be conveniently fixed to the second joint surface via welding.
In another aspect of the present invention, the first joint surface is disposed on the outer surface of the inner ring piece. The first joint surface is equally divided and extends outward to form a plurality of the first locating portions. The second joint surface is disposed on the inner surface of the inner ring hole of the tooth ring. A second locating portion, which is inwardly recessed, is disposed on the second joint surface to correspond to the first locating portion. The first locating portion can be engaged with the second locating portion. The first joint surface is fixed to the second joint surface via welding, and the first locating portion is fixed to the second locating portion via welding, enabling the inner ring piece and the tooth ring to stay in the same horizontal plane.
Compared with the prior art, the present invention has the following advantages:
First, the present invention adopts an inner ring piece made from a lightweight metal, and a tooth ring having high rigidity and wear-resistance, effectively reducing the overall weight of the crankset. Meanwhile, the tooth ring, which is used to engage with the chain, is made from a material having high rigidity, wear-resistance and heat-resistance, greatly prolonging the functional life of propelling the chain. Furthermore, the tooth ring does not need to be replaced as frequently as the traditional art due to the improved rigidity; the users thus feel safe when using the present invention.
Second, the inner ring piece is fixed into the tooth ring via welding, enabling the inner ring hole of the tooth ring to be covered by the inner ring piece. Consequently, the intensity of the tooth ring can be greatly improved. Meanwhile, the traditional dismountable structure of the inner ring piece and the tooth ring is replaced by the welding structure of the present invention, effectively preventing the inner ring piece from falling out from the tooth ring. Thus, the integral reliability of the present invention can be further improved.
To clearly expound the present invention or technical solution, the drawings and embodiments are hereinafter combined to illustrate the present invention. Obviously, the drawings are merely some embodiments of the present invention and those skilled in the art can associate themselves with other drawings without paying creative labor.
Drawings and detailed embodiments are combined hereinafter to elaborate the technical principles of the present invention.
As shown in
The tooth ring 20 is made from a rigid, heat-resistant and wear-resistant material, e.g., stainless steel, heat-treated steel, iron or metal coated with Teflon or other wear-resistant material, which can effectively strengthen the tooth ring 20 and improve its rigidity. A plurality of tooth portions 21 is formed on the outer side of the tooth ring 20. An inner ring hole 211 is disposed in the middle of the tooth ring 20. The inner surface of the inner ring hole is a second joint surface 22. When the tooth ring 20 and the inner ring piece 10 are assembled, as shown in
Another embodiment of the crankset 101 is shown in
The third type of crankset 102 is shown in
The fourth type of crankset 103 is shown in
The previous descriptions are of preferred examples for implementing the invention, and the scope of the invention should not necessarily be limited by this description. The scope of the present invention is defined by the claims.
Number | Date | Country | Kind |
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201611203069.X | Dec 2016 | CN | national |