Composed of multiple leaf springs, the sprung drawbar improves the ride comfort of the agricultural trailer and reduces stress on the tractor hitch. It is especially suitable for high-capacity agricultural trailers used to transport goods over long distances on the road.
When installing the sprung drawbar, use 3 U-bolts to install on the 20mm thick drawbar base plate. The top of the drawbar is further reinforced with an additional saddle at the pivot at the front of the chassis. The front pivot tube with phosphor bronze bushing is set at the top of the drawbar with easy-to-access lubrication points.
A leaf spring is the most widely used elastic element in automobile suspensions.
It is an approximate equal strength steel beam composed of several alloy spring sheets of equal width and unequal length. Its main function is to transmit all forces and moments between wheels and frames, relax impactive load caused by the road surface and realize vehicle guidance, make vehicles normal drive.
Leaf springs are widely applied to suspensions for heavy duty trucks, light duty trucks, pick-ups, cars, skeletal trailers, lowbed trailers, flatbed trailers, oil tank trailers, van trailers, wood transport trailers, gooseneck trailers, agricultrucal vehicles, etc. Classification of Leaf Springs include Conventional leaf springs, parabolic leaf springs, Z type air linkers, TRA leaf springs, trailer leaf springs,light duyt trailer spring, boat trailer springs, pickup leaf springs, semi trailer springs, truck springs, farming/agricultural trailer springs, sprung drawbar, bus springs, bogie/boogie springs, heavy truck springs, etc.
QC management system Implementing IATF 16949-2016
Services quality management system Implementing ISO 9001-2015
Product technical standards Implementing GB/T 19844-2018, GT/T 1222-2007
Warranty 12 months since shipping date
Quality testing by Stiffness Testing Machine, Arc Height Sorting Machine, and Fatigue Testing Machine, etc.
Raw material Top 3 steel mills in China
Flat bar cutting & center hole punching By fully automatic CNC cutting & punching production line
Center hole positioning tolerance: <±0.2 mm
Cutting length tolerance: <±2 mm
Leaf spring eye rolling Use automatic CNC leaf eye rolling machines, robot assistance, dedicated molds and toolings to guarantee below features:
1) Perpendicularity tolerance <1% x leaf width
2) Parallelism tolerance< 1% x leaf width
3) Eye diameter tolerance<±0.5 mm
4) Width tolerance of leaf end: -0.5mm ~ 0 mm
Leaf tapering/parabolic rolling Use automatic CNC parabolic taper rolling machines, robot assistance, dedicated molds and toolings to guarantee below features:
1) Taper thickness allowance: <±0.25mm
2) Width tolerance of leaf end: -0.5mm~0 mm
Heat treatment lines 1) Heating line:
The large-scale automatic CNC temperature control heating furnace not only ensures the heating time but also ensures that the temperature in the furnace reaches the design value (the temperature difference is within ±5 degrees), ensures that the leaf springs are heated evenly, and avoids excessively high or low temperatures, thereby ensuring the strength of the leaf springs and the service life limit meets the Crequirements.
2) Quenching & camber making line:
Use special CNC quenching equipment, mechanical oil, camber making machines and robot assistance to ensure that the quenching temperature, quenching time and cambers reach the design requirements.
3) Tempering line:
A dedicated CNC tempering production lines are used to ensure that the tempering temperature and the tempering time meet the design requirements.
So as to ensure the strength and service life of leaf springs.
Camber tolearance (mm) ≤±6 (Exceed spring industry standard ±7)
Fatigue life (cycles) >120,000+( Exceed spring industry standard 100,000 cycles)
Hardness 41HRC~48HRC
Shot peening Using special leaf spring shot blasting machines, the new and used steel shots are mixed for use. On the one hand, the new steel shots increase the deformation of the springs. On the other hand, the used steel shots have no edges and corners to avoid microcracks on the surface of the springs, thereby increasing the fatigue life.
Painting Normal painting and E-coating are available.
*E-coating finish line: paint film is uniform and plump, with strong adhesion and high anti-corrosion performance, to avoid dripping, flow marks, stagnation marks and other problems.
* Salt spray test >100 hours
Marks/stickers
* Clients' logo are supported
* Design marks or stickers for clients, free of charge
Other inspection equipment *Metallographic Microscope,
*Spectrophotometer
*Carbon Furnace
*Carbon & Sulfur Combined Analyzer, and
*Hardness Tester, etc.
Oversea sales volume (tons) 14,000+
Overseas market 30+ countries ( German, France, Poland, Portugal, Russia, Filand, USA, Canada, Mexico, Thailand, Vietnam, Malaysia, Singapore, The Philippines, Indonesia, Brazil, Bolivia, Argentina, Ecualor, Chile, Peru, Guatemala, Panama, Egypt, South Africa, Nigeria, Tanzania, etc)
Clients (overseas) 91+
Land area (square meters) 30,000+
Tons of annual output 35,000+
Number of equipments (sets) 200+
Number of employees 260+
Number of engineers 10+
Available certificates COC, PVOC, CIQ, SONCAP, BV, C/O, FORM E, FORM A.
The function of vehicle leaf springs:
The leaf spring is composed of many steel plates with elasticity, uniform width and different lengths. Its function is to connect the frame and the axle together in the form of suspension, expose between the frame and the axle, bear the load impact of the wheel on the frame, reduce the violent vibration of the body, maintain the stability of the vehicle and adaptability to different road conditions.
Shandong Xiaocheng Auto Parts Co., Ltd. is a modern private enterprise engaged in the design, development and production of automobile leaf spring. The company has been operating for more than ten years, focusing on the production and development of the existing leaf spring 2 production lines (annual output of more than 30,000 tons).
The company is a domestic supporting enterprise, and has close cooperation with FAW Jiefang and Sinotruk. Our raw material cooperation manufacturers include Jiangyin Xingcheng, Qingdao Special Steel, Fangda Special Steel and other large domestic steel mills to ensure the quality of raw materials.
Our production process is all in accordance with the original process, the use of rapid quenching oil for heat treatment, to ensure the level of metallographic structure. Surface shot peening, using stress shot peening machine, effectively ensure residual stress. The paint is treated by electrophoretic spraying, and the salt spray test reaches 400 hours. It has successfully passed various bench and road tests, and can be customized according to the drawings and corresponding requirements.
Company boss Mr. Zhou and technical R & D personnel engaged in more than 20 years, the company independent research and development "filial piety" brand leaf spring, committed to the "good filial piety first, integrity win the world" business philosophy, we do products to "filial piety" as the first person, to "sincere" for the business, welcome friends from all circles to visit and guide.
Main Products:
Benz Series, Single Point Trailer, RV, tractor-trailer, Light Trailer,Faw Jiefang J5, J6 dump truck, tractor full series, J7 tractor series and other leaf springs Heavy auto Haowo, Steyer, T7H, T5H, Shande heavy truck and other dump truck full series leaf springs, Auman, Dongfeng, Shaanxi auto series leaf springs, Northern Benz series leaf springs, trailer series leaf springs.
Q1: What material of the leaf spring can you supply?
A: We can supply different materials of leaf spring, including 60Si2Mn, SUP9,50CrV, 51CrV4, or any material as you require. Before placing the order, please make sure the material to us or we can advise the material to you according to your specification.
Q2: How about the quality of your product?
A: Our products are certified to ISO9001, TS16949 international quality standards. We have very strict Quality Control Systems.
Q3: What's your best price for your product?
A: We will quote you best price according to your requirements, so when you making an inquiry, please let us know the quantity and material of the product you need. The more quantity, the better price.
Q4:Can we print our own logo or label on the springs?
A: Yes, you can. We support logo print&label print&stamping, normally the print is free.
Q5: What about the package of the product?
A:The goods will be packed according to your requirements and in well protection before delivery.
