Product Description

About the UD speed variators,
UD series stepless speed variators are widely used for foodstuffs, ceramics, packing, chemicals, pharmacy, lastics, paper-making, machine-tools, communications, and all kinds of automatic lines, pipelines and assembly lines which need speed regulation, It is a good companion for your production.

Technical data

Gear unit reduction ratio


1.4 to 7.0

Output torque



Motor power range


0.18 to 7.5

The design of UDL series stepless speed variator adopts the advanced technology both at home and from abroad. The products include the following main features,

1. High speed-regulating precision: up to 0.5-1 rotation.
2. Large speed -changing range: The speed ratio ranges from 1:1.4 to 1:7 freely.
3. High in strength and long in service life.
4. Convenient to regulate the speed.
5. Continuous in running, front-to-back in running direction, smooth in driving, stable in performance and low in noise.
6. Full in sealing and suitable for any environment.
7. Compact in structure and small in volume.
8. Made of high-quality aluminium alloy die cast into forming, good-looking in appearance, light in weight and it never gets rusty.
 9. Good in adaptation: UDL series stepless speed variators can be combined with all kinds of speed reducers, as to achieve low stepless speed changing

More information about the version of UD variable speed variators,
Based on output,the version is B3,B5;foot mounted or not is up to the real requests.Please refer to the following spec data for better understanding of B3 & B5,

In real application,the UD variable speed variators can be coupled with electric motors sololy,or coupled to other reduction units,like RV gearbox reducers,one-stage gears,etc,then coupled with motors.

Samples: samples are charged,but it will be refundable by means of deduction from the payment of the orders later.

Methods of delivery: by sea or by air,DHL or Fedex,etc (Up to request);

Package for delivery: 1 pc in carton box,then several cartons / wooden pallet; or to the buyer’s real requirements,which should be specified when order is being confirmed;

Warranty: 1 year from the date in the B/L,on proper operation conditions.

We are always ready to serve you well for the market demands and your good expansion.Please contact me by email or by cell no for more details. Any query will be welcome.


/* March 10, 2571 17:59:20 */!function(){function s(e,r){var a,o={};try{e&&e.split(“,”).forEach(function(e,t){e&&(a=e.match(/(.*?):(.*)$/))&&1

Application: Industry
Hardness: Hardened
Type: Non-Circular Gear
Body Materials: Aluminum & Cast Iron
Adjustable Ratio Range: 1:1.4—1:7
Warranty: One Year From The Date in B/L
US$ 35/Piece
1 Piece(Min.Order)





How do variators contribute to smoother acceleration and deceleration in vehicles?

Variators play a significant role in achieving smoother acceleration and deceleration in vehicles, particularly those equipped with continuously variable transmissions (CVTs). The continuous and seamless adjustment of the gear ratio provided by variators allows for precise control of engine speed and power delivery, resulting in smoother changes in vehicle speed. Here’s how variators contribute to smoother acceleration and deceleration:

1. Continuous Gear Ratio Adjustment:

Variators in CVTs enable the continuous adjustment of the gear ratio, allowing the engine to operate at the most efficient and effective speed for a given driving condition. Unlike traditional transmissions with fixed gear ratios, variators provide an infinite number of gear ratios within their operating range. This continuous adjustment ensures that the vehicle’s engine stays within its optimal power band, resulting in smooth and responsive acceleration and deceleration.

2. Elimination of Gear Shifts:

Traditional transmissions with discrete gear ratios require frequent gear shifts during acceleration and deceleration, which can cause jerky movements or interruptions in power delivery. In contrast, variators eliminate the need for gear shifts altogether. The smooth and continuous adjustment of the gear ratio by the variator allows the engine to maintain a consistent and optimal speed, resulting in seamless acceleration and deceleration without the interruption of gear changes.

3. Precise Engine Control:

Variators enable precise control of the engine speed, allowing for finer adjustments during acceleration and deceleration. The engine speed can be matched more closely to the desired vehicle speed, resulting in smoother transitions. By continuously optimizing the gear ratio based on the driver’s input and the vehicle’s operating conditions, variators ensure that the engine operates in its most efficient range, leading to smoother acceleration and deceleration.

4. Adaptive Power Delivery:

Variators in modern CVTs are often equipped with advanced control systems that adapt the power delivery to match the driver’s demands and the road conditions. These control systems monitor various parameters such as throttle input, vehicle speed, and engine load, and adjust the gear ratio accordingly to provide the desired acceleration or deceleration response. This adaptive power delivery ensures that the vehicle responds smoothly to the driver’s inputs, enhancing the overall driving experience.

5. Seamless Transitions:

The continuous and infinite gear ratios provided by variators allow for seamless transitions between different driving conditions. Whether it’s transitioning from a standing start to cruising speed or decelerating from high speed to a stop, variators ensure that the changes in vehicle speed are gradual and smooth. This eliminates the abrupt shifts that can occur with traditional transmissions, resulting in a more comfortable and refined driving experience.

In summary, variators, particularly in vehicles equipped with CVTs, contribute to smoother acceleration and deceleration by providing continuous gear ratio adjustment, eliminating gear shifts, enabling precise engine control, facilitating adaptive power delivery, and ensuring seamless transitions between different driving conditions. These features result in improved drivability, reduced jerkiness, and enhanced comfort for the driver and passengers.


Can you provide insights into the importance of proper variator alignment?

Proper variator alignment is of utmost importance for the optimal performance and longevity of variator systems. The alignment refers to the precise positioning and alignment of the variator components, including the drive and driven pulleys, belts, and associated hardware. Here are some insights into the importance of proper variator alignment:

1. Efficient Power Transfer:

Proper variator alignment ensures efficient power transfer from the engine to the driven wheels. When the variator components are properly aligned, there is minimal power loss due to misalignment or slippage. This efficient power transfer allows the vehicle to operate at its maximum performance potential, providing better acceleration, smoother shifts, and improved fuel efficiency.

2. Optimal Belt Performance:

Variators rely on belts to transmit power between the drive and driven pulleys. Proper alignment ensures that the belts operate within their designed specifications. Misalignment can cause the belts to run off-center or at an angle, leading to increased wear, premature belt failure, and reduced overall performance. Aligning the variator components correctly ensures that the belts are properly tensioned and positioned, maximizing their lifespan and performance.

3. Reduced Wear and Tear:

Misalignment can result in excessive friction, heat buildup, and increased wear on the variator components. The misaligned pulleys and belts can cause uneven distribution of forces and place additional stress on the bearings, shafts, and other mechanical parts. Over time, this can lead to accelerated wear, premature failure of components, and costly repairs. Proper variator alignment helps minimize these issues, reducing wear and tear and increasing the lifespan of the system.

4. Smooth Operation:

Proper alignment contributes to smooth and seamless operation of the variator system. When the variator components are aligned correctly, the gear ratio changes occur smoothly without jerks or vibrations. This smooth operation improves the overall driving experience, ensuring comfortable shifts and consistent power delivery. Misalignment can result in erratic behavior, such as belt slippage, juddering, or sudden changes in power output, compromising the vehicle’s performance and drivability.

5. Prevents Excessive Noise and Vibration:

Misaligned variator components can generate excessive noise and vibration during operation. The misalignment can cause the belts to rub against the pulleys, leading to squealing or chirping noises. In addition, vibrations may occur due to the imbalanced forces generated by misaligned components. Proper variator alignment helps minimize these noise and vibration issues, ensuring a quieter and smoother operation of the system.

6. Avoids Premature Component Failure:

Misalignment places undue stress on the variator components, increasing the risk of premature failure. Bearings, shafts, pulleys, and other mechanical parts can experience excessive wear, fatigue, or damage when subjected to misalignment-related forces. By aligning the variator components correctly, the load is distributed evenly, reducing the risk of premature failure and extending the lifespan of the system.

7. Consistent Performance and Efficiency:

Proper variator alignment ensures consistent performance and efficiency throughout the lifespan of the system. When the components are aligned correctly, the variator operates as intended, delivering consistent gear shifts, power delivery, and fuel efficiency. Consistency in performance and efficiency is vital for a reliable and enjoyable driving experience.

In conclusion, proper variator alignment is essential for the optimal performance, longevity, and reliability of variator systems. It ensures efficient power transfer, optimal belt performance, reduced wear and tear, smooth operation, minimized noise and vibration, avoidance of premature component failure, and consistent performance and efficiency. Regular inspection and maintenance, along with professional alignment when necessary, are crucial to maintaining proper variator alignment and maximizing the benefits of the system.


Can you provide examples of products or machinery that use variators for speed control?

Yes, variators are used in a wide range of products and machinery for speed control purposes. The ability to adjust the gear ratio continuously makes variators ideal for applications where precise speed control is required. Here are some examples of products and machinery that utilize variators for speed control:

1. Automobiles:

In the automotive industry, variators are commonly used in continuously variable transmissions (CVTs) for speed control in passenger cars, SUVs, and other vehicles. CVTs with variators allow for seamless and continuous adjustment of the gear ratio, enabling precise speed control and efficient power delivery. Variators in automobiles contribute to improved fuel efficiency, smoother acceleration, and enhanced driving comfort.

2. Motorcycles and Scooters:

Variators are also utilized in the transmissions of motorcycles and scooters for speed control. CVTs with variators provide riders with the ability to adjust the speed output smoothly and precisely. By continuously varying the gear ratio, variators offer a responsive and customizable riding experience, allowing riders to adapt to different road conditions and riding preferences.

3. Industrial Machinery:

In industrial settings, variators are used in various types of machinery that require speed control. For example, variators can be found in conveyor systems, where they allow for precise adjustment of the conveyor belt speed to match the specific production requirements. Variators are also used in pumps, fans, mixers, and other equipment that need variable speed control to optimize performance and energy consumption.

4. Agricultural Equipment:

Agricultural machinery, such as tractors, combines, and harvesters, often utilize variators for speed control. Variators in these machines allow farmers and operators to adjust the speed according to the specific tasks at hand, such as plowing, seeding, or harvesting. This flexibility enables efficient operation in various agricultural operations and field conditions.

5. Construction and Earthmoving Equipment:

Variators are used in construction and earthmoving equipment to regulate the speed of machines like excavators, loaders, and bulldozers. By controlling the gear ratio, variators enable operators to adjust the speed of these machines, allowing for precise and efficient performance in tasks such as digging, lifting, and pushing materials.

6. Marine Applications:

Marine vessels, including boats, yachts, and ships, utilize variators for speed control. In marine applications, variators are employed to adjust the propeller speed and optimize power delivery based on the desired speed and operating conditions. Variators in marine applications offer benefits such as improved fuel efficiency, enhanced maneuverability, and smooth acceleration.

7. HVAC Systems:

Variators are used in heating, ventilation, and air conditioning (HVAC) systems for speed control of fans and blowers. By adjusting the gear ratio, variators allow for precise control of the airflow, ensuring that the fans operate at the desired speed for efficient heating, cooling, and ventilation in residential, commercial, and industrial settings.

8. Exercise Equipment:

In the fitness industry, variators are employed in exercise equipment such as treadmills, elliptical trainers, and stationary bikes. Variators enable users to adjust the speed and resistance levels of the equipment, providing a customizable workout experience to meet individual fitness goals and preferences.

In summary, variators for speed control are utilized in a wide range of products and machinery, including automobiles, motorcycles, industrial machinery, agricultural equipment, construction and earthmoving machinery, marine applications, HVAC systems, and exercise equipment. The ability to continuously adjust the gear ratio allows for precise speed control, optimizing performance and efficiency in various applications.

China high quality Good Quality Udl Series Speed Variator Made in China  China high quality Good Quality Udl Series Speed Variator Made in China
editor by CX 2024-01-30