- Hub
-
- On a Bicycle, the center of a wheel consisting of a shell to which Spokes attach and contains an axle along with two sets of bearings, bearing Cones, Lockwasher, Locknuts, and parts for attaching the wheel to the Frame.
- The base of a wheel with studs protruding from its face upon which the wheel itself is mounted to an automotive vehicle.
- A rotating component at the center of a wheel that contains the wheel bearings. It is attached to, or integral with, the brake drum or rotor.
- Hub brake
- Any type of brake (Disc, Drum, or Coaster) that operates through the wheel hub rather than the rim.
- Hubcap
- The covering that fits over the end of the wheel
Spindle to keep dust and water away from the wheel
bearings and brakes. It is often a styling feature, but it also acts as a good
container for keeping the Lug nuts from being lost when
changing tires. When a vehicle becomes stuck in the snow, it can also be used as a
temporary shovel. Also called wheel cover.
Also see
- Hub cap
- See
- Hub carrier
-
- A part of the suspension system which carries a rear wheel hub on a front-wheel drive vehicle, or on a rear-wheel drive vehicle with independent rear suspension.
- Another term for Steering swivel
- Hub-center steering
- Steering system in which the wheel pivots about its center point; the axle is normally fixed
- Hub height
- In a horizontal-axis wind turbine, the distance from the turbine platform to the rotor shaft.
- Hublock
- In 4-wheel-drive vehicles, it is inefficient to have the front wheels connected
when not needed. Most older vehicles required a person to get out and manually
switch each front hub. Now these hubs can be changed remotely with a switch inside
the vehicle.
Also see
- Hubodometer
- A register mounted on the axle hub which shows the distance the vehicle traveled. It is popular to record mileage for leasing of vehicles or tires particularly on trailers, since there is no other odometer present.
- Hub puller
- A special tool, of both jaw and slide hammer design, used to remove wheel hubs on vehicles by a pulling action
- Hub spacing
- The distance from one outer cone to the other along the axle. Front bicycle hubs have a standard width of 100mm. Rear hubs on older road bikes which are set up for freewheels generally have a width of 126mm. More recent rear hubs set up for cassettes have a width of 130mm.
- HUD
- An acronym for Heads up display which is a system of mounting gauges so that the read-out is shown on the Windshield. In this way the Driver does not have to take his eyes off the road to see how his vehicle is performing.
- Hudson
-
A brand of vehicle of which the 1929 Series L is a classic car. All 1948-49 models are milestone cars. The 1951-54 Hornet models are milestone cars.
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Hudson
- Humber
- A brand of vehicle of which the 1925-1948 models, with required application, are classic cars.
- Humidity
- The moisture or dampness in the air. Usually refers to an uncomfortably high
level of humidity.
Also see
- Humidex
- (short for humidity index) is a number which combines the air temperature in
Celsius and the amount of humidity in order to give a single number to represent
the perceived discomfort of weather that is hot and humid. It was devised by
Canadian meteorologists and first used in 1965. The humidex is widely used in
Canada and has been accepted in a number of other countries.
The humidex is calculated with the following formulaRange of humidex Degree of comfort Less than 29 No discomfort 30 to 39 Some discomfort 40 to 45 Great discomfort; avoid exertion Above 45 Dangerous Above 54 Heat stroke imminent
Humidex = (air temperature) + h
where
h = (0.5555)*(e - 10.0);
e = 6.11 * exp(5417.7530 * ((1/273.16) - (1/dewpoint)))
- Hummer
-
A large SUV produced by General Motors which is based on the military High Mobility Multipurpose Wheeled Vehicle (HMMWV or Humvee). Models included are
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Hummer- H1 (1993-2006)
- H2 (2003-07)
- H3 (2006-08)
- H3 Alpha (2008)
- H3x (2008)
- Hump
- A raised portion on the rim bead seat of passenger car wheels, retaining the beads of an insufficiently inflated tubeless tire on the bead seats, thereby preventing the tire beads from jumping into the rim well.
- Hump mode
- An operating condition where the transmitted torque in a viscous coupling rises to a value several times higher than the value produced in the so-called Viscous mode, due to internal clamping, i.e., metal friction of the coupling discs
- Hump rim
- Designation for a rim featuring a safety contour (Round hump, Flat hump, combination hump) either on the outer or on both bead seats. This protection is particularly important with tubeless tires, where sudden deflation can occur if the tire beads leave the bead seats and drop into the well. Compare Hump and Safety bead seat
- Hundredweight
- (cwt) An obsolete unit of weight measurement, used in some classic-car manuals. 1 British cwt = 5080 grams; 1 US cwt = 4535 grams
- Hunting
-
- The uneven running of an engine, due to air/fuel mixture being too rich.
- The action of some automatic transmissions when a vehicle is climbing a hill. The transmission constantly shifts between fifth gear and fourth gear
- Hunting tooth
- An extra, odd tooth on a gearwheel, designed to ensure the same teeth do not always mesh together, thus reducing wear
- Hurst six-speed shifter
- Upgraded shifter for manual transmissions which make the distance between gears shorter. The power band is more continuous from the bottom of first gear to the top of sixth. This means that when you shift, the amount of acceleration you experience will be more even throughout all the levels of the transmission. The result is that you can make the car accelerate faster and gain more control (through enhanced consistency) in turns or any application of power. Hurst also manufactures many other shifters with 2 to 6 gears for a variety of cars. Linda Vaughn has been their spokeswoman for many years.