Xi'an Jieguan Auto Parts Co., Ltd.

China ,Shaanxi
Verified Supplier

Chat online Now



Leave a Message

we will call you back quickly!

Submit Requirement

Home>
Bus Driving Chassis System>
Rubber Bellows Air Bag Shock Absorber Air Spring, Universal Chassis Suspension

China Rubber Bellows Air Bag Shock Absorber Air Spring, Universal Chassis Suspension





Rubber Bellows Air Bag Shock Absorber Air Spring, Universal Chassis Suspension

MOQ： 10
Price： $32.5~$33.5/pc
Get Latest Price


Payment Terms	T/T,D/P,D/A,L/C
Supply Ability	5000 pieces per month
Product Model	QN-390-310
Warranty Period	1–3 Years
Delivery Time	5-8 work days
Packaging Details	Single unit: Individually packed with PE plastic dust-proof bag for protection; Outer package: Export-grade 5-layer corrugated carton, 4 pcs per carton. Carton dimension: 42cm×42cm×38cm
Brand	Firestone
Product Type	Double convolution bellows type air suspension air spring
Color	Pure black industrial rubber outer surface
Full Product Name	Firestone QN-390-310 Rubber Bellows Air Bag / Air Spring Shock Absorber
Brand Name	Firestone
Model Number	QN-390-310
Place of Origin	China

View Detail Information

Inquiry by Email Get Latest Price

Chat online Now Ask for best deal

Explore similar products

Coach Air Bag Height Valve, 3 Port Thread & Quick Connect Height Control Valve

Chat online Now
VIE Type Quick Release Valve & Automatic Drain Valve for Bus & Truck Air Brake

Chat online Now

Product Details
Company Details

Product Specification


Payment Terms	T/T,D/P,D/A,L/C	Supply Ability	5000 pieces per month
Product Model	QN-390-310	Warranty Period	1–3 Years
Delivery Time	5-8 work days	Packaging Details	Single unit: Individually packed with PE plastic dust-proof bag for protection; Outer package: Export-grade 5-layer corrugated carton, 4 pcs per carton. Carton dimension: 42cm×42cm×38cm
Brand	Firestone	Product Type	Double convolution bellows type air suspension air spring
Color	Pure black industrial rubber outer surface	Full Product Name	Firestone QN-390-310 Rubber Bellows Air Bag / Air Spring Shock Absorber
Brand Name	Firestone	Model Number	QN-390-310
Place of Origin	China

Applicable Bus Brands	King Long, Yutong, Zhongtong, Higer, Yuchai buses and other mainstream passenger coaches
Installation Position	Chassis suspension system of passenger buses, for load bearing, vibration damping and vehicle height adjustment
Main Outer Material	High-strength composite natural rubber, reinforced with multi-layer cord fabric inside
Surface Feature	Craft rubber burrs on surface; embossed Firestone logo on the side wall
Internal Structure	Sealed air chamber structure with outstanding air tightness after inflation
Structural Feature	Bellows folded design, stable telescopic and compression performance under working air pressure
Main Functions	Chassis vibration damping, load bearing support, automatic vehicle height adjustment, buffering impact from uneven road surface
Working Principle	Bear load by internal compressed air; absorb vibration via compression and rebound of air
Advantages	Flexible elastic support, reduce rigid vibration of chassis effectively, upgrade riding comfort
Pressure Adaptability	Fit the conventional working pressure range of bus air suspension systems
Installation Mode	Vertically installed between vehicle frame and axle assembly
Matching Property	Direct OEM replacement part, no modification to vehicle structure needed
Applicable Scenarios	City buses, long-distance coaches, tourist passenger buses
Environmental Resistance	Anti-aging, ozone-resistant, crack-resistant, suitable for long-term complicated chassis working environment
Air Tightness	Excellent sealing effect, low natural air leakage rate, stable long-term operation
Fatigue Resistance	Resist frequent reciprocating compression and rebound without permanent deformation or damage
Single Packaging	Packed with independent plastic protective bag
Bulk Export Packaging	Standard export carton with shockproof protection for long-distance transportation

Basic Overview & Internal Structure

This product is the Firestone QN-390-310 double convolution bellows-type air spring (air bag), a core supporting component specially designed for bus chassis air suspension systems.Its overall structure is divided into four core layers from outside to inside:

Outer rubber protective layer: Made of high-strength wear-resistant composite natural rubber. It is resistant to ozone corrosion, ultraviolet aging, mud splashing and sharp object abrasion during vehicle driving; the side wall is embossed with the official Firestone brand logo, and surface rubber burrs are standard marks of the vulcanization molding process.
Reinforced cord fabric layer: Multiple layers of high-tensile polyester cord fabric are embedded inside the rubber layer. This framework greatly improves the tensile strength of the air bag, preventing bulging deformation and rupture under long-term air pressure load.
Inner air-sealing rubber layer: High-density airtight rubber film, which locks compressed air inside the closed air chamber steadily and ensures low natural air leakage in long-term operation.
End connecting fixing rings: Metal embedded structures at the top and bottom openings of the air bag, which are used for locking connection with the upper vehicle frame support base and lower axle mounting bracket.
The folded bellows curved design allows the air bag to stretch, compress and flex freely within the rated stroke when filled with compressed air.

Main Functions & Application Scope

Core Functions

Load-bearing support: The compressed air inside the air bag bears the weight of the bus body, replacing traditional rigid steel leaf springs; the bearing capacity can be adjusted by changing internal air pressure.
Vibration damping & shock buffering: When the vehicle passes bumpy roads, speed bumps and uneven pavement, the compression and rebound of internal air absorb road vibration and impact force, weaken rigid jolts transmitted to the carriage, and significantly improve passenger riding comfort.
Automatic vehicle height adjustment: Cooperating with the vehicle’s air supply system and height sensor, the air bag inflates or deflates automatically to keep the chassis height stable no matter the vehicle is empty or fully loaded.
Noise reduction & chassis protection: Reduce rigid collision noise between chassis components; buffer instantaneous impact to protect axles, shock absorbers and other chassis parts from excessive impact damage.

Applicable Vehicles

It is perfectly matched for Yutong, King Long, Zhongtong, Higer, Yuchai and other mainstream domestic large & medium-sized passenger buses, including city buses, long-distance intercity coaches and tourist buses; it can be used as a direct OEM replacement part for original vehicle air suspension air springs.

Standard Installation Steps

Preparation before installation

Lift the whole bus steadily with a professional lifting machine, fully unload the pressure on the target air spring; cut off the vehicle air supply system and release residual compressed air inside the old air bag completely.
Prepare matching bolts, sealing gaskets, torque wrench and new air spring; check the new air bag for cracks, air leakage damage or structural deformation before installation.

Step 1 Disassemble the old air bag

Remove the fixing bolts connecting the top of the air bag to the frame base and the bottom to the axle bracket one by one, take down the aged air spring carefully, clean dirt, rust and sediment on the upper and lower mounting bases thoroughly.

Step 2 Position the new air spring

Place the Firestone QN-390-310 air bag vertically between the upper frame support seat and lower axle mounting support; align the positioning holes at both ends of the air bag with the mounting holes of the vehicle brackets accurately.

Step 3 Lock and fasten fittings

Install special fixing bolts and anti-loose gaskets in sequence; tighten bolts with a torque wrench according to the factory specified torque value to prevent loose air leakage caused by insufficient fastening or thread slipping from over-tightening.

Step 4 Air circuit connection & inflation test

Reconnect the air pipeline to the air bag air inlet port; turn on the vehicle air supply system slowly to inflate the air bag to the standard working pressure specified by the bus manufacturer. Check the joint positions of pipelines and fixing ends for air leakage with soapy water.

Step 5 Debugging & acceptance

Lower the bus slowly to let the chassis bear load naturally; start the vehicle’s height adjustment system to test automatic inflation and deflation functions; drive the vehicle for a short trial run to confirm no abnormal air leakage, abnormal noise or unstable height deviation.

Company Details

Bronze Gleitlager

Bronze Sleeve Bushings

and

Graphite Plugged Bushings

from Quality China Factory



Business Type:

Manufacturer,Trading Company 


Year Established:

2010 


Total Annual:

80000000-90000000


Employee Number:

48~50 


Ecer Certification：

Verified Supplier 

Xi'an Jieguan Trading Co., Ltd.Founded 22 years ago, we are an integrated manufacturer & foreign trade enterprise specializing in full-range commercial vehicle spare parts, located in Xi'an, Shaanxi Province, China. Our company owns a 300-square-meter modern office space, paired with a self... Xi'an Jieguan Trading Co., Ltd.Founded 22 years ago, we are an integrated manufacturer & foreign trade enterprise specializing in full-range commercial vehicle spare parts, located in Xi'an, Shaanxi Province, China. Our company owns a 300-square-meter modern office space, paired with a self...

+ Read More

Reach Us
Xi'an Jieguan Auto Parts Co., Ltd.
No. 221 Zaoyuan West Road, Zaoyuan Subdistrict, Lianhu District, Xi’an, Shaanxi Province (Next to East of Sanqiao Auto Parts City)
https://www.sparepartsbus.com/

Chat online Now

Leave a Message, we will call you back quickly!