Driving-Driven Cone Gear Set 1-3 Modulus For Seven Speed Bicycle

Appearance & Structure
Shape: The gears are in the shape of a cone, and the teeth are distributed on the surface of the cone. The smaller bevel gear above, the teeth gradually shrink from the big end to the small end; The same goes for larger bevel gears. The modulus and pressure angle of the big end are standard parameters, the modulus is generally 1 - 3, the pressure angle is 20°, these parameters determine the basic size and transmission characteristics of the gear.
The small bevel gear has a shaft at one end, which is convenient to be installed in the center shaft position to receive foot power; There is a round hole in the middle of the bevel gear, which is fitted to the rear wheel hub. Together, they transfer power from the pedal to the rear wheels.
Tooth profile: Both are helical tooth design, and the tooth direction has an angle with the gear axis. This kind of tooth shape has a high degree of coexistence, stable transmission, can bear large loads, and has low noise during operation. The helical tooth design allows the gear to gradually change the contact line of the tooth surface during the meshing process, which is smoother than the straight tooth, which is suitable for the daily use of seven-speed bicycles.
The tilt angle of the helical teeth is precisely designed to ensure efficient engagement of the transmission in different gears. The inclination of the helical teeth of the pinion and the large gear match each other to ensure the accuracy and stability of power transmission.
Combinations: These two gears form an active-driven bevel gear set. The small bevel gear acts as a driving wheel and receives pedaling power; The bevel gear is installed as a driven wheel in the rear wheel hub, and the two are meshed to achieve power transmission and speed conversion. Different gear ratios correspond to different gears, the number of pinion teeth is less, the number of large gear teeth is more, the reduction ratio is large, and it is suitable for climbing; On the contrary, it is suitable for fast riding on flat roads.

Materials & Manufacturing
Material: The material is medium carbon steel or alloy steel. If medium carbon steel is used, it can ensure certain strength and toughness after quenching and tempering; If it is alloy steel, through carburizing, quenching and other heat treatment, the surface hardness and wear resistance can be greatly improved, and the use requirements of long-term riding can be met.
Manufacturing process: The forging process gives the gear a dense internal structure and improves the overall strength. Cutting to ensure the accuracy of the tooth shape, so that the tooth shape accurately meets the design standards. Heat treatment further improves material properties and increases the durability of the gears, allowing them to work stably in different environments and riding intensities.

DINGSCO Precision Gear Solutions — Pioneering Force in Equipment Transmission

Core Advantages: Cutting-Edge Equipment × Digitalized Processes × Full-Cycle Services

As a leading precision gear manufacturer, DINGSCO specializes in customized production of micro high-precision spiral bevel gears and hypoid gears through our multiple CNC seven-axis five-linkage spiral bevel gear grinding/milling machines and Gleason spiral bevel cutter technology. With DIN 6 precision class (tooth profile error ≤ ±5μm), 95%+ transmission efficiency, and ultra-high reduction ratios, we deliver reliable transmission solutions for robotics, motor drives, new energy vehicles, and more.

Why Choose DINGSCO?
✅ High Precision: Achieving DIN 6 grade accuracy, leading the industry in controlling tooth profile errors.

✅ High Efficiency: With a single - stage reduction ratio of up to 300:1, and a transmission efficiency of over 95%.

✅ Durability: 40% lower lifecycle cost, <0.5% failure rate.
✅ Fast response: The digital process can shorten the delivery cycle to 20 working days.

Contact Us Soon for gear optimization proposals and 3D meshing simulations!

Our company was formerly known as Changsha Double Star Gear Industrial Co., Ltd, which was established in 1994. It is a directly affiliated university-run enterprise founded by Central South University Professor Zeng Tao, the leading expert on spiral bevel gears in China. It was later renamed as Changsha Senjie Gear Co., Ltd (abbreviated as "CSG") in 2016. CSG is a production R&D base specializing in professional design, reserch, manufacture and sales of high-quality small module spiral bevel gears and high reduction hypoid gears and cylindrical gears. In 2023, Hunan Dinghan New Material Technology Co., Ltd. was established as a specialized international export business department. CSG has strong scientific research and development capabilities and is also equipped a full set of advanced equipment including seven-axis five-linkage CNC spiral bevel gear grinding machines and gear milling machines. By making the best use of the scientific and technological achievements and equipment of the Gear Research Institute of Central South University, machanical processing, heat treatment and testing. We have developed high-quality products featuring high reduction, high speed, heavy load, low noise and less teeth for users.

With the quality policy of "scientific and technological innovation, quality first, being first-class firm and customer‘s satisfaction", we have won the trust of well-known domestic and abroad enterprises with stable and excellent quality. It is committed to be a pioneer of the industry of China's small-module spiral bevel gears, and is dedicated to providing service for any related industry requiring industrial robots, CNC turning and milling compound power tool turrets, industrial sewing machines, reducers, bicycles, power tools and aeromodelling. We sincerely look forward to your cooperation!