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Sprung Heavy Duty and Light Duty Drawbar for Agricultural Trailers

  • 20+ Years of experiences (since 1999)
  • Implementing IATF 16949-2016
  • Implementing ISO 9001-2015
  • Quality standards: GB/T 19844-2018, GT/T 1222-2007
  • Flat bar suppliers from top 3 steel mills in China
  • Leaf length tolerance (mm): ±2 (Exceed spring industry standard ±3)
  • Camber tolearance (mm): ≤±6 (Exceed spring industry standard ±7)
  • Fatigue life ( cycles): >120,000+ (Exceed spring industry standard 100,000 cycles)
  • Annual output (tons): 35,000+
  • SKUs : 5,000+
Availability:

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Applications

WONDEE sprung drawbars

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.


For more about WONDEE Leaf Springs Project, please click:


leaf springs project

Features


QC management systemImplementing IATF 16949-2016
Services quality management systemImplementing ISO 9001-2015
Product technical standardsImplementing GB/T 19844-2018, GT/T 1222-2007
Warranty12 months since shipping date
Quality testing byStiffness Testing Machine, Arc Height Sorting Machine, and Fatigue Testing Machine, etc.
Raw materialTop 3 steel mills in China
Flat bar cutting & center hole punchingBy fully automatic CNC cutting & punching production line
Center hole positioning tolerance: <±0.2 mm
Cutting length tolerance: <±2 mm
Leaf spring eye rollingUse 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 rollingUse 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 lines1) 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)
Hardness41HRC~48HRC
Shot peeningUsing 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.   
PaintingNormal 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 market30+ 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 output35,000+
Number of equipments (sets)200+
Number of employees260+
Number of engineers10+
Available certificatesCOC, PVOC, CIQ, SONCAP, BV, C/O, FORM E, FORM A.


Comprehensive Info of  Leaf Spring:


Leaf spring typesConventional leaf springs, parabolic leaf springs, Z type air linkers, TRA leaf springs, trailer leaf springs, 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, light duty trailer springs/small springs, etc.
Materials grade:SUP7, SUP9, SUP9A, SUP10, SUP11, SUP11A and SUP12
60Si2Mn, 55CrMnA, 60CrMnBA, 50CrVA, 60CrMnBA, 60Si2CrA
61SiCr7, 55Cr3, 60CrB3, 51CrV4
9260, 5155, 5160, 6150, 51B60, 9254
Spring width range (mm)44.5~125 mm
Spring thickness (mm)6~50 mm
Interchangeable brands (make)MERCEDES BENZ, BPW, VOLVO, TOYOTA, HONDA, NISSAN, MAN, HOWO, SCANIA, RENAULT, DAF, MAN, ISUZU, IVECO, SISU, HYUNDA, TATRA, MAZ, SAF, ROR, FRUEHAUF, HINO, YORK, FUWA, CIMC, ETC.
ColorsRed, shinning black, dark black, grey, blue, as required.
Optional parts, components, & related partsCentor bolts, clamps, 

Copper bushes, bi-metal bushes, steel rubber bushings, rubber bushes, nylon bushes. 

U-bolts, brackets, pins.

PackageFumigated wooden pallets, steel pallets, as required.
Standards implementedIATF 16949-2016, ISO 9001-2015, GB/T 19844-2018, GT/T 1222-2007
Payment termsTT, LC, DP.
Lead timeAbout 25~35 working days.
MOQ60 pcs

Parameters

WONEE Sprung drawbars (7)


Agricultural Sprung Drawbar Trailer Springs


Spring Material Section Size Qty of Total Leaf
Centre of Eye to Centre of C/Bolt Centre of C/Bolt to End of Spring Centre of Eye to   End of Spring Inner Diameter of Bush
Parts   No. Section Size Leaves Capacity A B L ID1
(mm) (mm) (kg) (mm) (mm) (mm) (mm)
WLS1201407N01 120 x 14 7 1800 870 100 970 45
WLS1201409N01 120 x 14 9 2500 870 100 970 45
WLS1201411N01 120 x 14 11 2900 870 100 970 45
WLS1201413N01 120 x 14 13 3300 870 100 970 45
WLS1201415N01 120 x 14 15 3920 870 100 970 45


WONEE Sprung drawbars (8)

Components of sprung drawbar:

U-bolt supplied with nylon nuts

1. M24x2x121x170/190/220 for 7/9/11 Leaves Drawbar Springs

2. M30x2x121x260/280 for 13/15 Leaves Drawbar Springs


Note 1: Other leaf springs for agricultural trailers are available;


Note 2: Other classification of leaf spring are available, 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.

Production

About production processes of leaf springs, please kindly visit YOUTUBE link:


How to make leaf springs


Workshops of WONDEE Autoparts leaf springs :

WONDEE leaf spring workshops

(Flat bar workshop, production processing workshop, leaf spring assembly workshop, leaf spring finished production)


Processes & equipment of WONDEE Autoparts leaf springs :

WONDEE spring equipments

(1. Flat bar cutting and hole punching→ 2. Spring ends processing→ 3. CNC automatic eye rolling→ 4. Spring heating→ 5. Spring quenching→ 6. Spring tempering→ 7. Spring shot peening→ 8. Leaf spring assembling→ 9. Spring e-painting)


QC equipment of WONDEE Autoparts leaf springs :

WONDEE spring Testing equipment

(Material Metallographic analysis, spring spectral analysis, raw material inspection, eyes inspection, spring camber inspection, spring hardness test, salt spray test, fagigue life test, spring rate test)


Warehousing & Logistics of WONDEE Autoparts leaf springs: 

WONEE Sprung drawbars (9)

(Sprung drawbar finished prodution, spring packing, spring warehousing, leaf spring container laoding)


Other spring types of WONDEE Autoparts leaf springs:


leaf spring (1)

Components

Components & spare parts of WONDEE Autoparts leaf springs 


WONDEE spring components

(Bi-metal bushings, Composite bushes, Rubber bushes, Center bolts, Spring pins, Leaf spring hangers, Spring brackets, Spring steel flat bars)


In addition to supplying leaf springs, WONDEE Autoparts also supply different types of semi trailer components as below:

                                         

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Headquarters

Xinhe Industrial Park, Xiamen, Fujian, China 361006

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