Apta (Draft) Specification For: 30-ft, 35-ft, 40-ft, 45-ft, 60-foot (articulated) Transit Buses
IP 33.Wheels and tires 33.1Wheels
Download 0.56 Mb.
|
- Navigate this page:
- 33.2Tires
- IP 34.Steering
- 34.1Steering axle
- IP 35.Drive axle
- 35.1Non-drive axle
- IP 37.Steering
IP 33.Wheels and tires33.1WheelsDefault Painted steel Wheels and rims shall be hub-piloted with powder coated steel (maximum 3.5 mil) and shall resist rim flange wear. Alternative
Alternative One-sided polished aluminum Alternative Two-sided polished aluminum rims Alternative Tire pressure monitoring system All wheels shall be interchangeable and shall be removable without a puller. Wheels shall be compatible with tires in size and load-carrying capacity. Front wheels and tires shall be balanced as an assembly per SAE J1986. 33.2TiresTires shall be suitable for the conditions of transit service and sustained operation at the maximum speed capability of the bus. Load on any tire at GVWR shall not exceed the tire supplier’s rating. alternative The tires shall be provided under a lease agreement between the procuring agency and the tire supplier. Alternative The tires shall be supplied by the contractor.
Hydraulically assisted steering shall be provided. The steering gear shall be an integral type with the number and length of flexible lines minimized or eliminated. Alternative Electrically assisted steering shall be provided to reduce steering effort. 34.1Steering axleDefault Solid beam axle and grease-type front bearings and seals The front axle shall be solid beam, non-driving with a load rating sufficient for the bus loaded to GVWR and shall be equipped with grease type front wheel bearings and seals. Alternative
The front axle shall be non-driving with a load rating sufficient for the bus loaded to GVWR and shall be equipped with sealed, oiled-type front wheel bearings. Alternative
The front axle shall be of an independent suspension design, non-driving, with a load rating sufficient for the bus loaded to GVWR and shall be equipped with grease type front wheel bearings and seals. All friction points on the front axle shall be equipped with replaceable bushings or inserts and, if needed, lubrication fittings easily accessible from a pit or hoist.
The drive shaft shall be guarded to prevent hitting any critical systems, including brake lines, coach floor or the ground, in the event of a tube or universal joint failure. 35.1Non-drive axleThe non-drive axle is the drive axle without the drive gear with a load rating sufficient for the load to GVWR. IP 36.Turning radius
IP 37.Steering37.1Turning effortSteering effort shall be measured with the bus at GVWR, stopped with the brakes released and the engine at normal idling speed on clean, dry, level, commercial asphalt pavement and the tires inflated to recommended pressure. Under these conditions, the torque required to turn the steering wheel 10 degrees shall be no less than 5 ft-lbs and no more than 10 ft-lbs. Steering torque may increase to 70 ft-lbs when the wheels are approaching the steering stops, as the relief valve activates. Power steering failure shall not result in loss of steering control. With the bus in operation, the steering effort shall not exceed 55 lbs at the steering wheel rim, and perceived free play in the steering system shall not materially increase as a result of power assist failure. Gearing shall require no more than seven turns of the steering wheel lock-to-lock. Caster angle shall be selected to provide a tendency for the return of the front wheels to the straight position with minimal assistance from the driver. Directory: swc swc -> Packet Tracer Configure Initial Router Settings (Instructor Version) Instructor Note swc -> Chapter 50 Aircraft swc -> Conservation Security Program swc -> Click on enter the exhibition swc -> Southwest Christian – Tinley Park Invitational Meet Boys Cross Country Race Friday, September 30, 2016 Cool and Cloudy – 60 Degrees swc -> Date: October 28 – December 5, 2003 Project Website swc -> Publication and presentation log swc -> Ncdmf chpp chapter Shell bottom Ecological Role and Functions Ecosystem enhancement swc -> Directions: use the map in Download 0.56 Mb. Share with your friends:
| |||||||||||||||||||||||||
