Rubber Bellows Air Bag Shock Absorber Air Spring, Universal Chassis Suspension Damper for King Long, Yutong, Zhongtong, Higer and Yuchai Buses
Basic Properties
Place of Origin:
China
Brand Name:
Firestone
Model Number:
QN-390-310
Trading Properties
Minimum Order Quantity:
10
Price:
$32.5~$33.5/pc
Payment Terms:
T/T,D/P,D/A,L/C
Supply Ability:
5000 pieces per month
Product Summary
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 ...
Product Details
Full Product Name:
Firestone QN-390-310 Rubber Bellows Air Bag / Air Spring Shock Absorber
Product Model:
QN-390-310
Brand:
Firestone
Product Type:
Double Convolution Bellows Type Air Suspension Air Spring
Color:
Pure Black Industrial Rubber Outer Surface
Warranty Period:
1–3 Years
Product Description
| 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.
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