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  2. Wheel hub assembly - Wikipedia

    en.wikipedia.org/wiki/Wheel_hub_assembly

    The axle hub spins along with the wheels bolted to it and provide power to the wheels in order to rotate. A roller bearing between the axle hub and axle shaft ensures easy rotation of the non-drive wheels. On the axle side, it is mounted to the holding bracket from the chassis; on the disc side, the wheel is mounted to the bolts of the WHA ...

  3. Pitot tube - Wikipedia

    en.wikipedia.org/wiki/Pitot_tube

    This example, from an Airbus A380, combines a pitot tube (right) with a static port and an angle-of-attack vane (left). Air-flow is right to left. Types of pitot tubes A pitot-static tube connected to a manometer Pitot tube on Kamov Ka-26 helicopter A Formula One car during testing with frames holding many pitot tubes Location of pitot tubes on ...

  4. Wheel stud - Wikipedia

    en.wikipedia.org/wiki/Wheel_stud

    Wheel hub with disc brake and 5 wheel studs. Wheel studs are the threaded fasteners that hold on the wheels of many automobiles. They are semi-permanently mounted directly to the vehicle hub, usually through the brake drum or brake disk. Lug nuts are fastened onto the wheel stud to secure the wheel. When a wheel is removed for tire changes etc ...

  5. Portal axle - Wikipedia

    en.wikipedia.org/wiki/Portal_axle

    Comparison between normal and portal axles Pinzgauer portal axle. A portal axle (or portal gear lift) is an off-road vehicle suspension and drive technology where the axle tube or the half-shaft is offset from – usually above – the center of the wheel hub and where driving power is transferred to each wheel via a simple gearbox, built onto each hub. [1]

  6. Leading wheel - Wikipedia

    en.wikipedia.org/wiki/Leading_wheel

    The leading wheel or leading axle or pilot wheel of a steam locomotive is an unpowered wheel or axle located in front of the driving wheels. The axle or axles of the leading wheels are normally located on a leading truck. Leading wheels are used to help the locomotive negotiate curves and to support the front portion of the boiler.

  7. Spoke - Wikipedia

    en.wikipedia.org/wiki/Spoke

    For an asymmetric wheel such as a front wheel with disc brake or a rear wheel with chain derailleur, the value of d is different for the left and right sides. a is the angle between (1) the radius to a nipple hole in the rim to which a spoke is attached, and, (2) the radius to the flange hole holding the spoke.

  8. Mallet locomotive - Wikipedia

    en.wikipedia.org/wiki/Mallet_locomotive

    This came to be understood as a "Mallet" locomotive: an articulated locomotive in which the rear set of driving wheels were fixed in the main frame of the locomotive; an articulated truck carrying a second set of driving wheels; and compounding in which the high-pressure cylinders drove the axles on the main frame and the articulated axles were ...

  9. Pilot-operated relief valve - Wikipedia

    en.wikipedia.org/wiki/Pilot-operated_relief_valve

    The pressure at which the control pilot relieves is the functional set pressure of the PORV. When the pilot valve reaches set pressure it opens and releases the pressure from the dome. The piston is then free to open and the main valve exhausts the system fluid. The control pilot opens either to the main valve exhaust pipe or to atmosphere ...

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