The ratio between the speed of the turbine and the speed of the impeller is called the speed ratio of the torque converter . The speed ratio is 0 when the turbine is static and the impeller rotates, and 1 when both rotate at the same speed.
What is it called when the impeller and turbine turn at the same speed?
At cruising speeds , the impeller and turbine spin at almost the same speed with very little slippage. When the impeller is spun fast enough, centrifugal force throws oil out hard enough to almost lock the impeller and turbine.
What occurs when the speed of the turbine approaches the speed of the impeller?
As the turbine approaches the speed of the impeller, the one way clutch gradually disengages . The reactor no longer applies a torque to the turbine, so the impeller and turbine torques become equal in magnitude (see below).
What are the impeller turbine and stator elements of?
Torque converters are comprised of five main components: the impeller, the turbine, the stator, a clutch, and the fluid. The stator is what makes a torque converter a torque converter; without the stator, it’s just the fluid coupling. The impeller is a piece with tilted blades that look somewhat like a fan.
What kind of flow is occurring inside the torque converter when the turbine starts to rotate?
There are two types of fluid flow inside the torque converter. The first is the vortex flow , and the second being the rotary flow. In the below picture, the vortex flow is a spiraling flow which continues as long as there is a difference in speed between the impeller and the turbine.
What are the signs of a bad torque converter?
- Loss of Acceleration. ...
- Slipping Between Gears. ...
- Vehicle Won’t Shift at All. ...
- Transmission is Overheating. ...
- Transmission Fluid Leak. ...
- Bad Transmission Fluid.
Which of the following is another name for a torque converter impeller?
The impeller, also called the pump , is responsible for transferring the energy from the engine into the transmission oil, which the torque converter is completely full of.
What is impeller speed?
The tip speed is simply the distance that any selected point on the peripheral of the impeller travels in a set time . In other words the “speed” of that point. To calculate tip speed you simply multiply the diameter of the impeller by pi (3.14159) which gives you the circumference of the impeller at the outermost tip.
Which is better torque converter or CVT?
Modern automatics offer better fuel economy than manuals, thanks to a larger choice of drive ratios. ... Modern twin-clutch systems use seven gears, torque-converter autos are pushing as high as nine and CVTs can produce a near-infinite number of ratios, meaning they offer the best fuel economy.
Does a torque converter add horsepower?
An automatic transmission in general has a way of soaking up horsepower, but the torque converter can take a potent combination and turn it into a pig when the rubber meets the road. ... And while stall speed is important for a good launch, it’s also a place for horsepower to swirl down the drain.
Can a torque converter lock up an engine?
There are basically three ways a torque converter lockup clutch can fail: It can stay locked up , stalling the engine when the car is braked to a stop; it can never lock up, which shows up as an increase in fuel consumption and radiator temperature; or it can slip when engaged, allowing engine speed surges at a constant ...
Why does the stator only turn in one direction?
The stator sends the fluid returning from the turbine to the pump. This improves the efficiency of the torque converter. ... Because of this arrangement, the stator cannot spin with the fluid — it can spin only in the opposite direction , forcing the fluid to change direction as it hits the stator blades.
What are the disadvantages of torque converter?
Torque converters are, therefore, less fuel efficient than a manual gearbox or a CVT . Pros: Refined, smooth, reliable; more responsive than a CVT. Cons: Not the most fuel efficient; expensive. Cars offered with Torque Converter: Hyundai Creta AT, Maruti Suzuki Ciaz AT, etc.
Which of the following is an element of a single stage torque converter?
Single Stage Torque Converters
Each converter consists basically of three elements: the turbine, the stator, and the impeller . Single-stage converters come in two types of housing — stationary and rotating.
What is the single largest advantage of a modern torque converter in an automatic transmission for vehicle performance?
The torque converter provides a smooth automatic drive take-up from a standstill and a torque multiplication in addition to that provided by the normal mechanical gear transmission .
