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2. Locking hubs - Wikipedia

   en.wikipedia.org/wiki/Locking_hubs

   The hub is a component where the wheel is directly mounted to, and is outside the axle. The benefits of unlocking hubs for normal road use are mainly found in increased fuel efficiency . When the front hubs are locked, even if no power is sent to the front axle (by means of a transfer case ), the turning of the wheels will still spin the front ...

3. Hot box - Wikipedia

   en.wikipedia.org/wiki/Hot_box

   A hot box is the term used when an axle bearing overheats on a piece of railway rolling stock. [1] The term is derived from the journal-bearing trucks used before the mid-20th century. The axle bearings were housed in a box that used oil-soaked rags or cotton (collectively called "packing") to reduce the friction of the axle against the truck ...

4. Fifth-wheel coupling - Wikipedia

   en.wikipedia.org/wiki/Fifth-wheel_coupling

   After all, the purpose of the fifth wheel is to link the tractor and the trailer; indeed, trailers existed before Charles H. Martin introduced the Martin Rocking Fifth Wheel in 1915. At the time, the fifth wheel literally was a wheel that moved with the trailer—unlike today’s technology that secures a kingpin.

5. Kingpin (automotive part) - Wikipedia

   en.wikipedia.org/wiki/Kingpin_(automotive_part)

   Kingpins were always clamped in the centre and the swivel bearings at the ends, to increase the lever arm and so reduce the bearing load. Independent front suspension developed through the 1930s, for high-performance cars at least, often using double wishbone suspension. This performance also encouraged the reduction of unsprung weight.

6. Wheel bearing - Wikipedia

   en.wikipedia.org/wiki/Wheel_bearing

   Wheel bearing may refer to: Ball bearing; Bearing (mechanical) Fluid bearing; Jewel bearing; Journal bearing; Needle roller bearing; Plain bearing; Rolling-element ...

7. Caravan (trailer) - Wikipedia

   en.wikipedia.org/wiki/Caravan_(trailer)

   A fifth-wheel is a travel trailer supported by a hitch in the centre of the bed of a pickup truck instead of a hitch at the back of a vehicle. The special hitch used for fifth-wheels is a smaller version of the one used on 18-wheeler trucks and can be connected by simply driving (backing) the tow vehicle under the trailer. Fifth-wheel trailers ...

8. Heartland Recreational Vehicles - Wikipedia

   en.wikipedia.org/wiki/Heartland_Recreational...

   Presently, Heartland produces 20,000 units a year and is the 3rd largest 5th wheel manufacturer and 5th largest travel trailer manufacturer in the United States. [ 3 ] Catterton Partners, a Connecticut-based private equity firm that focuses on consumer business, made an equity investment in Heartland in February 2007.

9. Rolling resistance - Wikipedia

   en.wikipedia.org/wiki/Rolling_resistance

   Railroads normally use roller bearings which are either cylindrical (Russia) [63] or tapered (United States). [64] The specific rolling resistance in bearings varies with both wheel loading and speed. [65] Wheel bearing rolling resistance is lowest with high axle loads and intermediate speeds of 60–80 km/h with a Crr of 0.00013 (axle load of ...