Product Description

HFF2457138/39CK1BZ 21/28 Rear Bevel Gear For CHINAMFG CHINAMFG Ankai BENZ Axle Truck Spare Parts


Detailed Photos

Number of teeth of basin angle gear 28 teeth
Number of bevel teeth 21 teeth
Number of angular teeth 31 teeth
Matching axle assembly speed ratio I=5.26, 4.26, 4.637


Product advantages & features

(1) Accessory products of the truck, use 20CrMmti material.
(2) Heat treatment and tempering, high gear root strength, stronger impact resistance.
(3) Multi-purpose CHINAMFG carburizing processing, fine grinding processing technology, effectively reducing noise.
(4) Test product 1 by one, and inspect each product on delivery to ensure 100% quality stability of the product.
(5) The unified brand carton, inner bag and integral foam packaging, which is strong and beautiful.
(6) Passed ISO/TS16949:2009 quality management system certification.
(7) Passed ISO/IEC17571:2005 certification.
(8) Certified by National Laboratory Accreditation Committee.
(9) “100 Auto Parts Suppliers” in China.
(10) China Machinery Top 500.
(11) National first-class measurement enterprise.
(12) National first-class physical and chemical enterprise.

Factory Show

Brand Culture

Packaging & Shipping

Working Principle

Single reduction gear is a driving bevel gear (commonly known as angular gear) and a basin angle gear pair. The driving bevel gear is connected with the transmission shaft, rotates clockwise, sticks to its right side from the bevel gear, and rotates downward at the meshing point, which is consistent with the CHINAMFG direction of the wheel. Due to the small diameter of the driving bevel gear and the large diameter of the bevel gear, the function of deceleration is achieved.
The double reduction has an additional intermediate transition gear.The left side of the driving bevel gear is meshed with the bevel gear of the intermediate gear. The bevel gear is coaxial with a spur gear with small diameter, and the spur gear is meshed with the driven gear. In this way, the intermediate gear rotates backward and the driven gear rotates forward. There is a two-stage deceleration process in the middle.
Due to the increase of axle volume, double reduction was mainly used in vehicles with low engine power in the past, mainly in construction machinery with low speed and high torque.
In the double reduction final drive, if the second-stage deceleration is carried out near the wheel, it actually constitutes an independent part at the 2 wheels, it is called wheel reducer. The advantage of this is that the torque transmitted by the half shaft can be reduced, which is conducive to reducing the size and quality of the half shaft. The wheel reducer can be planetary gear type or composed of a pair of cylindrical gear pairs. When the cylindrical gear pair is used for wheel side deceleration, the up-down position relationship between the wheel axis and the half shaft can be changed by adjusting the mutual position of the 2 gears. This kind of axle is called portal axle, which is often used for vehicles with special requirements for the high and low position of the axle.
According to the number of the main reducer transmission ratio, it can be divided into single-speed and double-speed. 
Domestic cars basically adopt single speed main reducer with fixed transmission ratio. On the double reduction final drive, there are 2 transmission ratios for selection, and this main reducer actually acts as an auxiliary transmission.

Honor Certificate


Q1. Are you a factory or trading company? 
We are a factory integrating research, development, production and sales.

Q2. What are the advantages of your products?
We support product customization to meet customer needs for special products. We can strictly control the products from raw materials to production, processing, product quality inspection, delivery, packaging, etc., and provide customers with high-end products and the most advantageous prices.

Q3. How about products price?
We are a factory, all products are direct sale at factory price. For the same price, we will provide the best quality; for the same quality, we have the most advantageous price.

Q4. What is your terms of packing?
We have branded packaging and neutral packaging, and we can also do what you want with authorization. This is flexible.

Q5. How to guarantee your after-sales service?
Strict inspection during production, Strictly check the products before shipment to ensure our packaging in good condition. Track and receive feedback from customer regularly. Our products warranty is 365 days.
Each product provides quality assurance service. If there is a problem with the product within the warranty period, the customer can negotiate with us in detail about the related claims, and we will do our best to satisfy the customer.

Q6. How can I accurately buy the products I need?
We need accurate product number, If you can’t provide product number, you can send us your product picture, or tell us your truck model, engine name plate, and so on. we will
determine exactly what you need products.

Q7. Do you accept third party inspection?
Yes.we do

Q8. How about your delivery time?
Generally, it will take 3 to 10 days after receiving your advance payment. The specific delivery time depends on the items and the quantity of your order.

Q9. What are your brand agency conditions and advantages?
After we CHINAMFG an agent in 1 city, we will not CHINAMFG a second company to protect the agent’s brand advantage and price advantage. And we will help the agent develop customers and solve all kinds of difficult and miscellaneous problems about products.

Q10. What is your terms of payment?
By TT or LC. We’ll show you the photos of the products and packages before you pay the balance.

After-sales Service: Support
Warranty: 12 Months
Type: Chassis
Material: Steel
Model No: Hff2402038/39ck1bz
Application: Foton Auman; Ankai Axle; Benz Axle
US$ 92/Piece
1 Piece(Min.Order)

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Customized Request

bevel gear

How do you prevent backlash and gear play in a bevel gear mechanism?

In a bevel gear mechanism, preventing backlash and gear play is essential for ensuring accurate and efficient power transmission. Backlash refers to the clearance or free movement between the mating teeth of gears, resulting in a brief loss of motion or a dead zone when changing direction. Here are some methods to prevent backlash and minimize gear play in a bevel gear mechanism:

  • Precision Manufacturing: High-precision manufacturing processes are crucial for minimizing backlash and gear play in bevel gears. Accurate machining of gear teeth and precise control of tooth dimensions, profiles, and alignment help achieve tight meshing between the gears, reducing the clearance and backlash. Modern manufacturing techniques, such as CNC machining and gear grinding, can ensure the desired level of precision and minimize gear play.
  • Proper Gear Design: The design of the bevel gears can influence the amount of backlash and gear play. An optimized gear design, including suitable tooth profiles, pressure angles, and tooth contact patterns, can help distribute the load evenly and minimize the clearance between the mating teeth. By carefully considering gear design parameters, designers can reduce backlash and improve gear meshing characteristics.
  • Preload or Pre-Tension: Applying a preload or pre-tension to the bevel gears can help minimize backlash and gear play. This involves applying a slight force or tension to the gears, forcing them to maintain contact and reducing the clearance between the teeth. Preload can be achieved through various methods, such as using spring mechanisms, shimming, or adjusting the mounting position of the gears.
  • Backlash Compensation: Backlash compensation methods aim to minimize the effects of backlash and gear play by introducing mechanisms or techniques that compensate for the clearance. One common approach is to use anti-backlash gears, which have special tooth profiles or arrangements that reduce or eliminate clearance between the mating teeth. Another method is to incorporate backlash compensation devices, such as spring-loaded mechanisms or adjustable shims, that actively reduce the backlash during operation.
  • Tight Control of Tolerances: Maintaining tight tolerances during the manufacturing and assembly processes is critical for minimizing backlash and gear play. Close control of dimensions, alignment, and clearances ensures proper gear meshing and reduces the possibility of excessive play. Quality control measures, such as inspection, testing, and verification of gear dimensions, can help ensure that the gears meet the specified tolerances.
  • Regular Maintenance: Regular maintenance practices, including inspection, lubrication, and adjustment, are essential for preventing and minimizing backlash and gear play over time. Periodic checks for wear, misalignment, and proper lubrication can help identify and rectify any issues that may contribute to increased backlash. Timely maintenance and replacement of worn or damaged gears can help maintain optimal gear meshing and minimize play.

By implementing these methods, it is possible to significantly reduce backlash and gear play in a bevel gear mechanism, resulting in improved accuracy, efficiency, and longevity of the gear system.

bevel gear

How do you retrofit an existing mechanical system with a bevel gear?

Retrofitting an existing mechanical system with a bevel gear involves modifying the system to incorporate the bevel gear for improved functionality or performance. Here’s a detailed explanation of the retrofitting process:

  1. Evaluate the Existing System: Begin by thoroughly evaluating the existing mechanical system. Understand its design, components, and operational requirements. Identify the specific areas where the introduction of a bevel gear can enhance the system’s performance, efficiency, or functionality.
  2. Analyze Compatibility: Assess the compatibility of the existing system with the integration of a bevel gear. Consider factors such as available space, load requirements, torque transmission, and alignment feasibility. Determine if any modifications or adaptations are necessary to accommodate the bevel gear.
  3. Design Considerations: Based on the system evaluation and compatibility analysis, develop a design plan for incorporating the bevel gear. Determine the appropriate gear type, size, and configuration that best suits the retrofitting requirements. Consider factors such as gear ratio, torque capacity, tooth profile, and mounting options.
  4. Modify Components: Identify the components that need modification or replacement to integrate the bevel gear. This may involve machining new shafts or shaft extensions, modifying housing or mounting brackets, or adapting existing components to ensure proper alignment and engagement with the bevel gear.
  5. Ensure Proper Alignment: Proper alignment is crucial for the successful integration of the bevel gear. Ensure that the existing system components and the bevel gear are aligned accurately to maintain smooth and efficient power transmission. This may involve adjusting shaft positions, aligning bearing supports, or employing alignment fixtures during the retrofitting process.
  6. Lubrication and Sealing: Consider the lubrication requirements of the bevel gear system. Ensure that appropriate lubricants are selected and provisions for lubrication are incorporated into the retrofit design. Additionally, pay attention to sealing arrangements to prevent lubricant leakage or ingress of contaminants into the gear system.
  7. Testing and Validation: After the retrofitting process is complete, conduct thorough testing and validation of the modified mechanical system. Ensure that the bevel gear functions as intended and meets the desired performance requirements. Perform functional tests, load tests, and monitor the system for any abnormalities or issues.
  8. Maintenance and Documentation: Develop a maintenance plan for the retrofitted system, including periodic inspection, lubrication, and any specific maintenance tasks related to the bevel gear. Document the retrofitting process, including design modifications, component specifications, alignment procedures, and any other relevant information. This documentation will be valuable for future reference, troubleshooting, or potential further modifications.

Retrofitting an existing mechanical system with a bevel gear requires careful planning, engineering expertise, and attention to detail. It is recommended to involve experienced gear engineers or professionals with expertise in retrofitting processes to ensure a successful integration and optimal performance of the bevel gear within the system.

By retrofitting an existing mechanical system with a bevel gear, it is possible to enhance its capabilities, improve efficiency, enable new functionalities, or address specific performance issues. Proper analysis, design, and implementation are essential to achieve a successful retrofit and realize the desired benefits of incorporating a bevel gear into the system.

bevel gear

Can you explain the concept of straight and spiral bevel gears?

Straight and spiral bevel gears are two common types of bevel gears that have different tooth geometries and characteristics. Here’s a detailed explanation of the concept of straight and spiral bevel gears:

Straight Bevel Gears:

Straight bevel gears are a type of bevel gears with straight-cut teeth that are machined on the cone-shaped surface of the gears. The teeth of straight bevel gears are parallel to the gear axis and intersect at a 90-degree angle. These gears are often used when the intersecting shafts need to transmit rotational motion at a right angle.

Straight bevel gears have the following characteristics:

  • Tooth Engagement: In straight bevel gears, the tooth engagement occurs gradually as the gears rotate. This results in a relatively smooth and continuous transfer of power between the gears.
  • Noise and Vibration: Straight bevel gears can produce more noise and vibration compared to other types of bevel gears, particularly at higher speeds. The straight-cut teeth create impact and noise during the engagement process.
  • Efficiency: Straight bevel gears have relatively high efficiency due to their simple tooth geometry and direct engagement.
  • Applications: Straight bevel gears are commonly used in applications such as automotive differentials, hand drills, and other mechanical power transmission systems where a 90-degree change in direction is required.

Spiral Bevel Gears:

Spiral bevel gears are another type of bevel gears with curved teeth that are machined on the cone-shaped surface of the gears. The teeth of spiral bevel gears are cut in a spiral pattern, gradually curving along the gear surface. This spiral tooth geometry provides several advantages over straight bevel gears.

Spiral bevel gears have the following characteristics:

  • Tooth Engagement: Spiral bevel gears have a more gradual and smoother tooth engagement compared to straight bevel gears. The spiral-shaped teeth allow for progressive contact between the gears, resulting in reduced impact, noise, and vibration.
  • Noise and Vibration: Spiral bevel gears produce less noise and vibration compared to straight bevel gears due to their improved tooth engagement characteristics.
  • Load Capacity: Spiral bevel gears have higher load-carrying capacity compared to straight bevel gears due to the increased contact area between the gear teeth. This makes them suitable for applications that require higher torque transmission.
  • Efficiency: Spiral bevel gears have slightly lower efficiency compared to straight bevel gears due to the sliding action between the teeth during engagement. However, advancements in gear design and manufacturing techniques have improved their efficiency.
  • Applications: Spiral bevel gears are commonly used in applications where smooth and quiet operation is required, such as automotive rear axle drives, machine tools, and industrial machinery.

In summary, straight bevel gears have straight-cut teeth that intersect at a 90-degree angle, while spiral bevel gears have curved teeth that engage in a spiral pattern. Straight bevel gears are suitable for applications that require a right angle change in direction, while spiral bevel gears provide smoother engagement, reduced noise, and higher load-carrying capacity. The selection between straight and spiral bevel gears depends on the specific requirements of the application, including the desired level of noise, vibration, efficiency, and torque transmission.

China Best Sales Hff2402038/39ck1bz 21/28 Rear Bevel Gear for CZPTAnkai Benz Axle Truck Spare Parts manufacturer China Best Sales Hff2402038/39ck1bz 21/28 Rear Bevel Gear for CZPTAnkai Benz Axle Truck Spare Parts manufacturer
editor by CX 2023-11-29