SANAA
UREMBO NA USTAWI
UJANJA
UTAMADUNI NA HISTORIA
BURUDANI
MAZINGIRA
CHAKULA NA VINYWAJI
UHANDISI WA KINYUME
SAYANSI
MICHEZO
TEKNOLOJIA
VAZI
The Disc Brake: A Stop Is Heat, and the Disc Can Get Rid of It
Frederick Lanchester, in Birmingham in 1902, fitted a car with a brake that clamped a disc between two pads, like a bicycle's calliper brake closing on a flat plate instead of a rim. The idea came back strongly in the 1950s, when faster cars were fading their drum brakes on long descents.
A brake turns the car's energy of motion into heat, and in a hard stop that heat has nowhere to go but into the brake itself. A disc's friction faces are open to the air, and a ventilated disc pumps air through its middle as it turns; there is no self-servo, so the braking stays steady as the pads heat.
This rung works out how hot a disc gets per stop and how hard the calliper must clamp, and measures a real disc's temperature after braking.
Kati
About 2 hours
Maagizo
1
1
Energy per stop and clamping force
Energy per stop and clamping force
Inapakia daftari la Jupyter…
2
2
Measure a disc after braking
Measure a disc after braking
On a bicycle with disc brakes (or a car, with its owner's help and on private ground), measure the disc temperature with the infrared thermometer before a stop, then brake firmly from a steady speed to a halt and measure again straight away — on the braking surface, not the shiny spokes. Repeat three stops in quick succession and watch the temperature climb: each stop adds heat faster than the disc can lose it.
Wait five minutes and measure again: most of the heat has gone. That cooling rate is what a ventilated disc improves.
Do not touch a disc after braking; it can be well over 100 °C. Look at the pads through the calliper: glazed, shiny pads have been overheated.
Zana zinazohitajika:
Kipimajoto cha infrared
Saa ya kupima muda
Glavu za Kazi za Ngozi3
3
History and context
History and context
**Frederick William Lanchester, Birmingham, 1902** — a calliper disc brake on a motor car. No patent number is asserted here. Disc brakes spread in aircraft in the 1930s and 40s; in cars they came back in the 1950s, when Jaguar raced with them at Le Mans in 1953, and from the 1960s they became standard at the front.
**Honest limits.** No self-servo, so a disc needs more clamping force than a drum — hence the servo assistance on most cars. Exposed discs collect water and dirt. And a disc can only absorb so much before its pads fade too: sustained descents still call for engine braking.
Zana Zinazohitajika
3- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
Blueprint zinazohusiana
Blueprint hizi zinashiriki maarifa — mbinu, vifaa au kanuni
The Drum Brake: Shoes That Push Themselves Harder
na Martin
Mitambo
11
0
0
0
0
0
Hydraulic Brake
na Emma
TEKNOLOJIA
35
0
0
0
0
0
The Eddy Current Brake
na Emma
Nguvu ya Sumaku
32
0
0
0
0
0
Fins and the Heat Sink: A Fin That Is Too Long Does Nothing
na Emma
Mitambo
4
0
0
0
0
0
Freewheel and Coaster Brake
na Spartan
Uchimbaji chuma
41
0
0
0
0
0
CC0 Umma Wote
Mchoro huu umetolewa chini ya CC0. Uko huru kunakili, kubadilisha, kusambaza, na kutumia kazi hii kwa madhumuni yoyote, bila kuomba ruhusa.
Saidia Mtengenezaji kwa kununua bidhaa kupitia Mchoro wao ambapo wanapata Kamisheni ya Mtengenezaji iliyowekwa na Wachuuzi, au unda marudio mapya ya Mchoro huu na uiunganishe kama kiungo katika Mchoro wako kuchangia mapato.