Transmission/Gear setup with constant output and variable input?

In summary, the conversation discusses the existence of a device called a CSD, or Constant Speed Drive, which is used in jet engines to maintain a constant speed for main aircraft generators. There are also newer versions called IDGs, or Integrated Drive Generators, which combine the generator and CSD into one unit. The conversation also mentions the desire for a smaller version of this device, for example the size of a shoe box, with lower torque capabilities.
  • #1
infamous_Q
99
0
is there such a thing as what's mentioned in the subject heading? Preferably a small device would be wanted...

Thanx!
 
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  • #2
What's meant by constant and variable? Speed? Torque?
 
  • #3
well speed primarily, but information on a device that has the constant/variable setup with torque would be useful also.
 
  • #4
Yes there is. It is called a CSD, or Constant Speed Drive. They are used on jet engines. The main aircraft generators are driven off of the engines accessory gear drive. When the engine changes speeds due to operating requirements (i.e. takeoff vs cruise speed) the generator must maintain the same speed. That is where the CSD comes in. There are newer versions also called IDG for Integrated Drive Generator which is the same thing essentially excapet the generator and CSD are combined into one single unit. You can look these up for information on their principles of operation to give you ideas.

What do you mean when you say "small size?"
 
  • #5
thanks for the help!

and by small size i mean definitely not a jet engine lol, and more along the lines of a shoe box perhaps. but it would not be for an huge amount of torque.
 

1. What is a transmission/gear setup with constant output and variable input?

A transmission/gear setup with constant output and variable input is a mechanism used to transfer power from a source (usually an engine) to the wheels of a vehicle. It consists of a series of gears that can be engaged or disengaged to vary the speed and torque of the output shaft, while keeping the input speed constant.

2. How does a transmission/gear setup with constant output and variable input work?

The input shaft is connected to the engine, while the output shaft is connected to the wheels. As the engine rotates at a constant speed, the gears in the transmission rotate at different speeds depending on which gear is engaged. This allows for a greater range of speeds and torque to be transmitted to the wheels, making it easier to drive the vehicle at different speeds and on different terrains.

3. What are the advantages of a transmission/gear setup with constant output and variable input?

One of the main advantages is that it allows for a more efficient use of the engine's power. By varying the gear ratio, the engine can operate at its most efficient speed for a given driving condition. This can result in improved fuel efficiency and lower emissions. Additionally, the ability to switch between gears allows for better control and handling of the vehicle.

4. What are the different types of transmissions/gear setups with constant output and variable input?

The most common types are manual transmissions, which require the driver to manually shift gears, and automatic transmissions, which use a hydraulic system to shift gears automatically based on driving conditions. There are also variations such as continuously variable transmissions (CVT) and dual-clutch transmissions (DCT), which offer different ways of achieving variable gear ratios.

5. How do I know when to shift gears in a transmission/gear setup with constant output and variable input?

This will depend on the specific type of transmission and the driving conditions. In general, most vehicles will have a recommended shifting pattern in the owner's manual. Additionally, paying attention to the engine's RPM (revolutions per minute) can help determine when to shift gears. It is important to shift gears smoothly and avoid lugging (driving in a higher gear at low speeds) or over-revving (driving in a lower gear at high speeds), as this can cause damage to the transmission and decrease fuel efficiency.

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