190303c Flashcards
What is another name for the reactionary member in a planetary?
Held member or being held.
What is the middle gear in a planetary called?
The sun gear.
What is the gear called that is in constant mesh with the sun and the internal gears?
Planetary gears or planet pinons.
Planetary gears are mounted, what is the member called the gears are mounted to?
Planetary carrier.
What are the two names of the outside gear that is a constant mesh with the planetary pinions?
Internal gear or ring gear.
What determines the number of planetary pinons in a gear set?
Depends on the load or torque the gearset is required to transmit. The greater the number of pinons, the greater the torque.
What is gear ratio?
Refers to the number of revolutions the input gear makes to complete one revolution of the output gear.
What is the formula for gear ratio?
Drive
What is an example of a 3 to 1 ratio gear set?
Non hunting reduction gear set.
What is an example of 4.25:1 gearset?
Partial non-hunting reduction gear set.
What is an example of a 4.11111111:1 gearset?
A hunting reduction gear set.
Why are planetary gears used in powershift and automatic transmissions?
These are used as a basic means to modify torque and speed from the engine.
In a planetary gear set how do you get 1st speed reduction?
Input is the sun gear
Output is the carrier
Held is the internal gear
How do you get a 2nd speed(mild) reduction in a planetary gear set?
Input is the internal gear
Output is the carrier
Held(reactionary) sun gear
Explain 1st speed overdrive?
Input is the planet carrier
Output is the internal
Sun gear is held
Explain 2nd speed overdrive?
Input is the carrier
Output is the sun
Internal gear is held reactionary
In a planetary gear set if the carrier is held you will always get what condition?
Reverse
Explain reverse reduction in a planetary?
Carrier is held
Sun is the input
Internal gear is the output