FD120-20 Contitech Double Convoluted Style Air Spring 77-270mm Lift Axle Air Bags

FD120-20 Contitech Double Convoluted Style Air Spring 77-270mm Lift Axle Air Bags

Product Description

FD 120-20 Rubber Air Spring Technical Data

Top cover plate diameter: 141mm
Bottom cover plate diameter: 141mm
Threaded holes: M8X15mm

Center distance between threaded holes:70mm
Air hole specifications:G1/4,G3/4
Maximum outer diameter of bladder: 218mm
Maximum height: 270mm
Minimum height: 77mm
Compressed height: 193mm

FD 120-20 736 Cross Automann SP2B08RA-C736

FD 120-20 736 Cross Automann SP 2B08RA-C736

FD 120-20 736 Cross MAC 2380 Z7

Double Convoluted Air Spring For Lift Axle

A Double Convoluted Air Spring is a specific type of air spring commonly used as the lifting mechanism for lift axles on trucks and trailers. Here's a breakdown of why it's well-suited for this application:

1.What is a Lift Axle?
An axle that can be mechanically raised off the road surface when not needed (e.g., when the vehicle is unladen or partially laden).
Purpose:To reduce tire wear, improve fuel efficiency, decrease wear on roads, and comply with axle weight regulations by only deploying the axle when the load requires the extra capacity.

2. Why is a Double Convoluted Spring Ideal for Lift Axles?

High Lift Capability: The long stroke is the primary reason. Lift axles need to retract completely, raising the tires high off the ground to avoid contact. Double convoluted springs excel at providing the necessary vertical travel to achieve this significant lift height.

Sufficient Load Capacity: While prioritizing lift height, they still provide sufficient air volume and pressure capacity to support the axle's share of the load effectively when lowered and inflated.

Reliable Deployment: When air pressure is applied, the spring extends predictably and forcefully to lower the axle smoothly onto the road surface.

Compactness: The design allows the necessary stroke within the spatial constraints around the axle and suspension components, especially when retracted.

Articulation: Provides the flexibility needed as the suspension moves over uneven terrain when the axle is lowered and loaded.

Durability (in this context): While they have more exposed rubber than sleeve springs, the intermittent use of a lift axle (spending much of its time retracted and unpressurized) generally means the double convoluted design offers sufficient lifespan for this specific application. The benefits of high lift outweigh potential wear concerns.

3. How it Works in a Lift Axle System?

1. Lifting (Axle Retracted): Air is exhausted from the spring(s). The spring collapses to its minimum height under the weight of the axle assembly. The double convolution design allows it to compress down significantly, pulling the axle and tires up high off the road.

2. Lowering (Axle Deployed): Compressed air is supplied to the spring(s). The spring inflates, extending its height. The long stroke of the double convoluted spring pushes the axle assembly downward forcefully until the tires contact the road and the spring reaches the pressure needed to support its share of the vehicle's load.

Guangzhou Guomat Air Spring Co., Ltd. is located in Guangzhou, about 15min’s drive from Baiyun Airport. Our mainly products are air spring, rubber bellows, air suspension spring, air suspension compressor and refitted suspension system. They are widely used in bus, truck, cabin, vehicles’ seat, luxurious car and industrial machine field.

GUOMAT Factory gate：

Established in 2008, Our company covers 20,000㎡ and is located in Taihe Town Baiyun District. With the rapid development of our company, we are equipped with modernized workshop and advanced rubber air springs equipments now. We are the first company who started air spring business and has become one of the largest air spring manufacturing bases in China.

In 2017, we launched a collaboration with High Tech of US customers to customize the products of our customers and the logo of our customers. Every year, there are about 10,000 orders. In continuous cooperation, the products meet the international inspection standard ISO/TS16949:2009, and the customers are very satisfied with the products produced. This is our high recognition from American customers and also gives us Great motivation.

In 2018, we started cooperation with German GmbH, mainly industrial air springs, which are suitable for industrial equipment. We have successfully developed and produced the natural air-seal of the skin to reach the 700mm flanged air spring, the customer's annual demand is a few hundred.

With the development of business and demand for customers, our company introduced business with TomLog Corporation in 2010, our strategic cooperative partner in Taiwan. Then we developed air compressor program and air spring related business, in 2015, America Goodyear Corporation met with the transfer of shares in the North American plant, our company was granted with sale agent for air springs in China, providing more choice for our customers. Our company adopts the most advanced domestic air spring processing equipment and international production technology. Combined with unique production process, our company strictly execute international standards for production and spare no efforts to create the world-class products. We will endeavor to make air spring widely used at home and abroad, and let more and more customers to enjoy the best damping effect.