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City Bus

Product

Overview

The city bus is a 40-foot low-floor diesel transit vehicle for high-frequency urban service. Its defining feature is a step-free entrance: the Low-Floor Center Section drops the cabin floor to near curb height, and a kneeling Air Suspension plus a fold-out Wheelchair Ramp make the vehicle accessible to wheelchair users, strollers, and passengers with limited mobility. It is engineered for durability under stop-and-go duty cycles, frequent door operation, and high passenger turnover.

Construction

The bus is built around the Low-Floor Chassis Frame, a welded steel ladder frame whose center section is dropped to create the low floor. A rear-mounted Diesel Engine drives through an Automatic Transmission to the Drive Axle, a portal axle whose hub-reduction gearboxes raise the halfshafts clear of the aisle. Steering loads are carried by the Front Portal Axle.

Braking and ride quality depend on two air systems. The Air Brake System supplies dual-circuit pneumatic brakes with ABS, fed from an engine-driven compressor and reservoir tanks. The same supply feeds the Air Suspension, which levels the body and kneels at stops. The passenger envelope is formed by the aluminum-framed Body Shell, entered through pneumatic Passenger Door units. Inside, the Passenger Seating provides fixed transit seats and grab rails, while the driver works from the Driver Area. Route information is shown on the front Destination Sign, and the rear-mounted Cooling System pack manages engine temperature.

Bill of materials for City Bus

17 top-level lines as of r193283
# Item / sub-assembly Part no. Qty/assy Ext. qty Parts Type
1 Low-Floor Chassis Frame 7 parts city-bus-chassis 1× 1 0 assembly
2 Diesel Engine 28 parts city-bus-engine 1× 1 0 assembly
3 Automatic Transmission 5 parts city-bus-transmission 1× 1 0 assembly
4 Drive Axle 4 parts city-bus-drive-axle 1× 1 0 assembly
5 Front Portal Axle 3 parts city-bus-front-axle 1× 1 0 assembly
6 Air Brake System 13 parts city-bus-air-brake-system 1× 1 0 assembly
7 Air Suspension 7 parts city-bus-air-suspension 1× 1 0 assembly
8 Body Shell 22 parts city-bus-body-shell 1× 1 0 assembly
9 Passenger Door 9 parts city-bus-passenger-door 2× 2 0 assembly
10 Passenger Seating 9 parts city-bus-passenger-seating 1× 1 0 assembly
11 Driver Area 7 parts city-bus-driver-area 1× 1 0 assembly
12 Destination Sign 6 parts city-bus-destination-sign 1× 1 0 assembly
13 Wheelchair Ramp 4 parts city-bus-wheelchair-ramp 1× 1 0 assembly
14 HVAC Unit 5 parts hvac-unit 1× 1 0 assembly
15 Electrical System 19 parts city-bus-electrical 1× 1 0 assembly
16 Cooling System 9 parts city-bus-cooling 1× 1 0 assembly
17 Wheel Assembly 5 parts wheel-assembly 6× 6 0 assembly

267-word article