Questions tagged [transmission]

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Electric engine and transmission

What kind of automatic transmission would be the best to connect an electric engine with the rear axle of a RWD car? Specifications: 200HP, 3000rpm electric motor top speed 220km/h The automatic ...
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Is it ok for clutch to slip in DCT in certain situations?

When driving a car with manual transmission on start you slowly release the clutch so the car doesn't jerk. So clutch slippage here is not that bad if I understand this correctly? And also couldn't ...
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In an automatic transmission would it be better to have less shift elements applied in order to achieve gear ratio or more?

On ZF's website they stated that in their ZF8HP transmission they can achieve gear ratios with only 2 shift elements open which reduces drag losses. But what is bothering me is that drag loss isn't ...
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3answers
26 views

How to accumulate torque of multiple independent gears?

I did not find any answers to this simple problem across the web, maybe seeking help in this forum helps: As an example, let's assume we have multiple windmills, each of them producing torque, but ...
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2answers
37 views

Is it possible to design automatic transmission without torque converter?

So the reason why torque converter is needed is because it disconnects engine from transmission. It has also extra benefit of multiplying torque but that is not 100% necessary. From what I have seen ...
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2answers
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How does ferranti effect occur?

I search and read about Ferranti effect online, but none seems to be clear enough for me to understand how it actually happens. I must say, I do not have much prior knowledge about inductive/...
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1answer
34 views

Why aren't detent clutches used in car transmissions?

In automatic transmissions some parts need to be moving with the engine in one moment and in the other they need to be stopped. Why don't transmisisons then use detent clutches to accomplish this?
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Why does DSG have low torque capacity?

Why does DSG have low torque capacity? They are very simillar to manuals but manual transmissions can handle greater torque. Why js that? What determines the torque capacity of transmission?
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0answers
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Negative transmit power in dBM

I am calculating the transmit power for $K$ single antenna IoT devices in an Indoor scenario. The receiver has 64 antennas. I am trying to minimize the transmit sum-power, i.e., $\sum_k p_k$, where $...
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Why do instructions on creation of roller chain sprocket tooth profile require redundant measurements?

I'm CADing a tooth profile for a bicycle chainring model and I'm referring my measurements and formulas to these sources: http://www.gearseds.com/files/design_draw_sprocket_5.pdf https://data.epo.org/...
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2answers
35 views

Would some manufacturing processes be more efficient if driven differentially by a single motor, up to ~150 kW, than multiple lower-rated motors?

I'm writing a discussion paper on the potential energy efficiency benefits of integrating different manufacturing processes by co-location on the same site. One possible field for integration is in ...
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2answers
24 views

Transmission for variable-speed flywheel to output a steady output speed?

If you had a flywheel acting as a mechanical battery in an all mechanical system, such that you could pump energy into the flywheel up to a desired speed and then slowly drain its kinetic energy - ...
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1answer
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Calculations of compound gears?

Recently I've been scratching my head over an assignment, and I have trouble understanding a couple of the parts. The issue I have is with the overall calculations, since we've just started on ...
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2answers
68 views

How to fix this gear

This is a gear that transfers force from a motorcycle kickstarter to the transmission. What method should I use to repair the missing teeth.
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1answer
47 views

Measuring intensity of a radio wave reflected from a metal plate

I am building a Project that can pinpoint location of a pen or any object (something as small as 0.5 mm radius sphere) placed on a flat screen. I am using a ultrasound sensor (initially but i can ...
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3answers
482 views

Manual transmission: Why downshifting is less smooth than shifting up?

Today while driving I had to make a quick shift to a lower gear that was not as smooth as it should've been. I've been taught that while shifting to a lower gear you have to be more careful when ...
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2answers
2k views

Friction clutch and the force required

I recently learned the basics of automotive clutches, more specifically friction clutches. Here is a simplified version of their operation explained to me (the car starts at rest): The engine and the ...
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1answer
25 views

Automatic translation of either-sided rotation to fixed directions?

Is there a purely mechanical device that takes in clockwise or counter-clockwise rotation 'indiscriminately' and outputs in both cases clockwise rotation?
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2answers
48 views

Equal power transmission in 4x4 vehicles?

If a 4x4 (true 4x4 not AWD) has 3 wheels slipping, does the one tire with traction receive all the torque available from the transmission? Is there typically a reduction in power transmission in 4x4 ...