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Classification of Leaf Springs

Views:0     Author:Wondee Autoparts     Publish Time: 2021-09-14      Origin:Wondee Autoparts

A leaf spring is the most widely used elastic element of automobile suspensions. It is an approximate equal strength steel beam composed of several alloy spring sheets of equal width and unequal length. There are many kinds of leaf springs, which can be classified according to the following classification methods:


1. Classified by raw material sizes 


1) Small size leaf springs


It mainly refers to the leaf springs with material width range of 44.5 ~ 50mm and material thickness of 6 ~ 9mm.

There are mainly the following leaf springs:

Boat Trailer leaf springs, livestock Trailer leaf springs, RV leaf springs, station wagon leaf springs, utility trailer leaf springs, etc.


A single eye small size leaf spring for boat trailers from a China manufacturer/WONDEE AutopartsA double eye small size leaf spring for boat trailers from a China manufacturer/WONDEE AutopartsA small size leaf spring for agricultural trailers from a China manufacturer/WONDEE AutopartsA single eye small size leaf spring for agricultural trailers from a China manufacturer/WONDEE AutopartsA single eye small size leaf spring with flat end for boat trailersfrom a China manufacturer/WONDEE Autoparts

 2) Light duty leaf springs


It mainly refers to the leaf spring with material width of 60 ~ 70mm and material thickness of 6 ~ 16mm.

There are mainly the following leaf springs:

Pickup leaf spring, van leaf spring, agricultural trailer leaf spring, minibus leaf spring, etc.


A double eye light duty leaf spring for Toyota pickup from a China manufacturer/WONDEE AutopartsA light duty leaf spring for minibuses and light duty trailersfrom a China manufacturer/WONDEE AutopartsA light duty leaf spring for light duty trailers and trucks from a China manufacturer/WONDEE Autoparts

3) Heavy duty leaf springs 


It mainly refers to the material width of 75 ~ 120mm and the material thickness of 12 ~ 56mm. 

There are four main categories:

 

A. Semi trailer leaf springs, such as BPW / FUWA / YTE / TRAseries trailer leaf springs, with material sizes involving 75x13 / 76x14 / 90x11 / 90x13 / 90x16 / 100x12 / 100x14 / 100x16, etc.

A 75x13-9L leaf spring for light duty trailers and trucks from a China manufacturer/WONDEE AutopartsA heavy duty leaf spring for trailers and trucks from a China manufacturer/WONDEE AutopartsA 90x13-10 heavy duty leaf spring for semi trailers and trucks from a China manufacturer/WONDEE Autoparts

 B. Bogie(Single point suspension) leaf springs, involving 24t / 28T / 32t leaf springs for a boogie single point suspension, with material sizes of 90x13 / 16 / 18 and 120x14/16/18.

A heavy duty leaf spring for 24T bogie suspensions from a China manufacturer/WONDEE Autoparts


C. Bus leaf springs, involving Toyota / Ford / Fuso / Hino and other brands. Most products are parabolic leaf springs.

A double eye parabolic leaf spring for buses and trucks from a China manufacturer/WONDEE Autoparts/WONDEE AutopartsA double eye parabolic leaf spring for buses and trucks from a China manufacturer/WONDEE AutopartsA double eye parabolic leaf spring for buses and trucks from a China manufacturer/WONDEE Autoparts


D. Heavy duty truck leaf springs, including Benz / Volvo / Scania / Hino / Isuzu and other models. The main products are parabolic leaf springs.

 

 A double eye parabolic leaf spring for Hino trucks rear springs from a China manufacturer/WONDEE AutopartsA double eye parabolic leaf spring for heavy duty Hino trucks from a China manufacturer/WONDEE Autoparts


E. Agricultural leaf springs, which are mainly used on off-road transport trailers.

A light duty leaf spring for agricultural trailers from a China manufacturer/WONDEE Autoparts


F. Air linkers(Trailing arm), mainly used for air suspensions.

A air linker spring for semi trailers and truck air suspensions from a China manufacturer/WONDEE AutopartsA air linker spring for semi trailers and truck air suspensions from a China manufacturer/WONDEE AutopartsA air linker spring for semi trailers and truck air suspensions from a China manufacturer/WONDEE AutopartsA air linker spring for semi trailers and truck air suspensions from a China manufacturer/WONDEE Autoparts

2. Classified according to the section of flat bar


1) Conventional leaf springs:  they are composed of multiple leaf springs with equal width and thickness and different lengths. The product manufacturing process is relatively simple and the manufacturing cost is low.

A conventional leaf spring for semi trailers and truck suspensions from a China manufacturer/WONDEE Autoparts

A conventional leaf spring for semi trailers and truck suspensions from a China manufacturer/WONDEE AutopartsA conventional leaf spring for semi trailers and truck suspensions from a China manufacturer/WONDEE Autoparts

2) Parabolic leaf springs:  they are composed of one or more leaf springs with thin ends, thick middle, equal width and unequal lengths. Compared with the conventional equal thickness leaf springs, they have many advantages: light weight; longer fatigue life; lower working noise; better ride comfortability and stability.

A parabolic leaf spring for heavy duty semi trailers and truck suspensions from a China manufacturer/WONDEE AutopartsA parabolic leaf spring for heavy duty semi trailers and truck suspensions from a China manufacturer/WONDEE AutopartsA parabolic leaf spring for heavy duty semi trailers and truck suspensions from a China manufacturer/WONDEE Autoparts


3. Classified according to leaf spring structure

 

A leaf spring is a relatively complex industrial product, involving tens of thousands of products models. Through the product process structure, we can make the following classification:


1) Double-eye leaf spring

A Double-eye leaf spring for trailers and truck suspensions from a China manufacturer/WONDEE AutopartsA Double-eye leaf spring for trailers and truck suspensions from a China manufacturer/WONDEE AutopartsA Double-eye leaf spring for trailers and truck suspensions from a China manufacturer/WONDEE AutopartsA Double-eye leaf spring for trailers and truck suspensions from a China manufacturer/WONDEE Autoparts


2) Single-eye leaf spring

A single-eye leaf spring for trailers and truck suspensions from a China manufacturer/WONDEE Autoparts

3) Sliding plate leaf spring(Semi trailer springs, TRA springs series, etc.)

A semi trailer leaf spring for trailers and truck suspensions from a China manufacturer/WONDEE AutopartsA TRA leaf spring for trailers and truck suspensions from a China manufacturer/WONDEE Autoparts


4) Main and help spring combined leaf springs


A Main and help spring combined leaf springs for trailers and truck suspensions from a China manufacturer/WONDEE Autoparts


(Upper help spring type)


 A Lowerhelp spring type leaf springs for trailers and truck suspensions from a China manufacturer/WONDEE Autoparts

(Lowerhelp spring type)

5) Air linker

A Straight plate type air linker for trailers and truck suspensions from a China manufacturer/WONDEE Autoparts

Straight plate type air linker


drawing -air linker02

Z-type air linker

 

6) Other leaf springs, such as sprung drawbar etc.

A sprung drawbar for agricultural trailers suspensions from a China manufacturer/WONDEE Autoparts


4. According to the raw material grade classification of leaf spring(spring steel flat bar), the following table for reference:


GB

ISO

ASTM

JIS

DIN

NF

BS

OCT

H

Applied

Usage

65Mn


1066




080A67

65Γ


Low-end aftermarket

60Si2Mn

61SiCr7

9260

SUP7

60SiCr7

60Si7

Z51A60

60C2

6~16

Small, light-duty, truck/pickup,   heavy-duty springs etc.

55CrMnA

55Cr3

5155

SUP9

55Cr3

55Cr3

525A58


16~25

Medium/heavy duty springs,

parabolic spring,

etc.

60CrMnA


51605

SUP9A



525A60




50CrVA

51CrV4

6150

SUP10A

50CrV4

51CrV4

735A51

50CrΦA

25~35

Medium/heavy duty springs,

parabolic spring,

etc.

51CrV4








35≤H≤45

Air linkers

52CrMoV4








H>45

Air linkers

 

Remarks:


Various spring end processes: 


There are many kinds of end treatments for leaf springs, such as eye rolling, eye wrapping, edge trimming, corner cutting, rib and groove pressing, bending, tapering, etc. Various processes are briefly described as follows:

 

1. Eye rolling


The eye rolling is divided into upper eye rolling, central eye rolling and lower eye rolling. As shown in the following diagram:

 leaf spring eye rolling

2. Eye wrapping


The eye wrapping is divided into 3 / 4 eye wrapping, 1 / 2 eye wrapping and 1 / 4 eye wrapping. As shown in the following diagram:

leaf spring Eye wrapping leaf spring Eye wrapping leaf spring Eye wrapping


3. End treatment


End treatment includes edge trimming, corner cutting, bending, groove pressing, hole punching, edge pressing. As shown in the following diagram:

 

leaf spring End treatment leaf spring End treatment end treatment03leaf spring End treatment

  From: Wondee Autoparts





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