May 11, 2025
The development history of the expanding brake in the braking heat – dissipation system of electric bicycles
The EcoE 5000W electric bike
Powerful Motor: EcoE is equipped with a 60V 5000W high-speed brushless motor. Due to different loads and road conditions, the electric bike drive system provides adjustable assistance, allowing you to stay healthy, relax, and exercise.
Accessories: This electric bike accessory set includes a rearview mirror, water bottle holder and bottle, a sturdy phone mount, and a waterproof phone pouch. The reinforced cargo rack allows you to easily carry extra items needed for your ride. Additionally, if you need more accessories, you can purchase a detachable storage rack, passenger safety seat, trailer, and more.
60V 32AH Battery: The bike is equipped with a high-capacity, removable 32AH battery, providing longer range per charge and over 1000 charge cycles. With pedal assist, the fat tire e-bike can travel 35-80 miles, depending on riding mode, load, and terrain. You can also purchase a spare battery for extended trips.
Comfort and Versatility: This fat tire electric bike comes with dual front suspension and rear shocks to reduce impact and strain during rides. Its 26-inch wheels, 4-inch tires, and SHIM 7-speed system offer excellent grip across diverse terrains. Front and rear disc brakes ensure safe, responsive stopping, whether on mountain trails or city streets.
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- Early Application Stage: The expanding brake was applied to electric bicycles in the early days. Its structure is relatively simple and the cost is low. It adopts a cable – operated design, which drives the brake by pulling force. By pulling the brake cable, the half – moon brake pads inside are separated to both sides, and the outer side of the brake pads rubs against the wheel hub to generate resistance to restrain the vehicle speed, thus achieving braking. In the early stage of the development of electric bicycles, due to the relatively slow speed, the requirement for braking performance was not particularly high. The expanding brake was widely used in various electric bicycles due to its better braking effect and better heat – dissipation performance than the clasp brake, and became one of the mainstream braking methods at that time.
- Widespread Use Stage: With the development of the electric bicycle industry, during the period of rapid development of China’s electric bicycle industry from 2004 to 2014, the expanding brake was still the braking choice for many electric bicycles because of its stability and applicability. In this stage, the output and sales volume of electric bicycles increased significantly, the expanding brake technology was relatively mature, the production process was continuously improved, and the product quality gradually stabilized. However, with the increase in the speed and use frequency of electric bicycles, some disadvantages of the expanding brake gradually emerged, such as relatively insufficient single – time braking force and loud braking sound.
- Gradual Replacement Stage: After the implementation of the “New National Standard” in 2019, higher requirements were put forward for the safety performance of electric bicycles. Braking systems with better braking effects and higher safety, such as disc brakes, gradually became popular. Due to its relatively poor braking effect and high replacement cost, the application of the expanding brake in the mainstream electric bicycle field is getting less and less, and it is gradually being replaced by disc brakes and drum brakes. However, it is still used in some low – speed and small – sized electric bicycles.
The following is the relevant table:
| Stage | Time | Characteristics |
|---|---|---|
| Early Application Stage | The early stage of the development of electric bicycles | Simple structure, low cost, good braking effect, better heat dissipation than the clasp brake, widely used |
| Widespread Use Stage | 2004 – 2014 | Mature technology, stable product quality, but some disadvantages emerged with the development |
| Gradual Replacement Stage | After the implementation of the “New National Standard” in 2019 | Due to problems such as braking effect and cost, the application is gradually decreasing, and there is an obvious trend of being replaced by disc brakes and drum brakes |
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