Questions tagged [transmission]

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Best way to share and sell new CVT design?

What is the best way to sell an unpatented CVT design? It is hydraulic/direct drive design, and can function as a clutch mechanism. I am just one person, and not capable or inclined to build it ...
Zekchelovek's user avatar
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32 views

69kV insulator identification

Rather Specific question, is there a way or could anyone figure out what this clamp-top 69kV multipart insulator came from like who makes it or the technical name etc these are transmission lines in ...
JJMclean's user avatar
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37 views

Are double universal (Cardan) joints exactly constant velocity?

Some double universal joints use a centering joint to ensure that the angle of the input and output are equal to maintain a constant velocity through the joint. From what I can tell, this centering ...
Ryan's user avatar
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What forces act ona key in a shaft during the work of spur gears?

What forces act on a key in a shaft during the work of spur gears? Are the forces which act on key only from the torque of shaft or also forces from gears mesh and work?
Mlodzian's user avatar
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1 answer
56 views

How do I find the optimal/best Gear ratios for an 3-speed transmission of an RC car?

[was told to post here, from physics stackexchange] Says it in the title - I've done a bunch of stuff so far, but my work seems to be wrong. I'm trying to build an RC car (pretty small, about 25 cm in ...
bepispasta42069's user avatar
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1 answer
85 views

Optimal frequency for penetrating 1 meter of water using radio waves?

We are attempting to penetrate 1m of water featuring dissolved ions ( assume salinity of sea water) using radio waves. Aside for using wavelengths of very low frequency radio or below, what would be ...
Hypnos Stratagem's user avatar
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25 views

How can I transmit the force induced by magnetic torque?

So I'm working on a project where I'm trying to transmit the force induced by magnetic torque onto people's hands, thereby making it a haptic feedback system. This is the stucture that I designed to ...
NakedRaccoon's user avatar
1 vote
1 answer
87 views

Why do high speed boats have 2 speed transmission?

For example in this link you can see a 2 speed gearbox for a high speed boat http://www.coanracing.com/custom-block2/transmissions.html/xtreme-marine-transmission.html , what even is the purpose of ...
Timothy Scherer's user avatar
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1 answer
327 views

How to change the direction of a chain-sprocket system

I’m looking for a way to change the direction (90 °) of a motion transmitted by a basic chain-sprocket system. Is there such a thing as a chain-driven equivalent to straight bevel gears? I’m planning ...
Ludovik B.'s user avatar
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1 answer
21 views

What kind of system should I use to move the toroids of my CVT transmission?

I have a CVT transmission, which consists of a metal belt and four circular toroid discs, that form two pulleys. I need to be able to move the two toroids further and closer together. This movement ...
sillybilly's user avatar
-1 votes
2 answers
189 views

Wind-up toy car constant speed problem

Set Up: In a classic wind-up car we store energy in spring. The energy then used unequaly in time resulting variable speed during the ride. Max torque and power and acceleration at the begining, with ...
Yury Komarinskiy's user avatar
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2 answers
308 views

How does this transmission valve "hydraulic computer" work?

I just came across this: The claim is that it is a kind of analogue computer. But I don't see any moving parts. How does it work? EDIT: If someone could draw lines on the diagram to illustrate, that ...
spraff's user avatar
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1 answer
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Finding a gear supplier for a contra rotating boat propellor [closed]

I’m the new propulsion engineer in a solar boat team (something like this https://energyboatchallenge.com/en/home-english/, solar class). This year I have to design and build a contra rotating ...
cedric van sweeveldt's user avatar
-1 votes
2 answers
113 views

What goes into making a good automatic transmission software?

I was recently taught how an automatic transmission works (at least the main principle) and although very pleased of my new knowledge, I am now left with another unanswered question: how does the ...
t9dupuy's user avatar
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2 answers
164 views

Cogs ratio for 1:20 speed increase

Question may be a bit stupid and funny, but any kind of help would be appreciated. I need some kind of a transmission system. I have little to no experience in mechanics or similar, that's why I'm ...
faris.ibrisevic's user avatar
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2 answers
123 views

Clutch for rotating axis of mount used for astronomy

a short disclaimer that for me mechanical engineering is a hobby. Please be gentle with me, even if there may be an obvious answer. The main reason for asking here is that searching for the topic you ...
roofkid's user avatar
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1 answer
57 views

Small belt transmission: Radius difference?

I am trying to make a pulley reduction system for my project. I need it to be as quiet as possible, so I am considering pulleys. My project also has limited space, so I am trying to have as small a ...
George Menoutis's user avatar
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2 answers
48 views

Could we theoretically use much lower frequencies for fiber optic transmission?

I was thinking, fiber optic communication uses baseband signaling and even 400 gigabit Ethernet only needs ~100 GHz with the modulation that they use. So you still have 3 orders of magnitude before ...
Fiber110's user avatar
1 vote
0 answers
329 views

Gear Oil HP 85w-140 vs HP-140

I have a 4 Stroke scooter 150cc (SYM JET-14). Manufacturer recommends 85w-140 gear oil. The price difference between 85w-140 and single grade 140 is tremendous. Given that in my country and during ...
m.nasim's user avatar
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13 votes
1 answer
1k views

How does a (pulley based) continuous variable transmission (CVT) work?

How does the (pulley based) CVT achieve the following? no requirement for a clutch fuel economy smooth gear transition
NMech's user avatar
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4 votes
3 answers
225 views

How does my automatic car shift without complete temporary loss of acceleration

When my car shifts gears, the car's acceleration never goes to 0. I feel that there is constant torque to the wheels throughout the entire shift. How is this possible during a gear change? ...
Ardalan G.'s user avatar
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70 views

Double Stub Matching Impedance

I'm trying to understand the double stub matching impedance using Smith Chart. Here is the diagram for the double stub impedance: The impedance on the right has to appear purely resistive. So ...
Orpheus's user avatar
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Where do I start with learning how to transfer data via RF

So I literally have no idea where to start but I know what I want to make. The goal is to somehow transmit 25mb/s of data across 15km with high penetration. Acceptable for reaching through trees and ...
Karekin_FPV's user avatar
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0 answers
340 views

How does tractor achieve constant PTO speed?

Tractors have a PTO shaft which supplies power to implements. Most implements are rated 540 or 1000 RPM. I'd like to know more about transmission that is used to convert variable motor shaft rotation ...
sanjihan's user avatar
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3 answers
172 views

What is a gearbox with switchable outputs called?

I need a mechanism with which one motor can drive one of two outputs. So only one output should be active at a time, but the mechanism should be able to switch between the outputs. What is a mechanism ...
Dakkaron's user avatar
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1 vote
3 answers
813 views

Engaging and disengaging drive power

I'm looking for a solution to selectively engage and disengage a drive shaft with a number of output pulleys, one-at-a-time, like a clutch. Speed would be around 1000 RPM, and torque less than 20 inch-...
PProteus's user avatar
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Typical dirt bike clutches - is there a norm?

I have several of the typical 49cc 2 stroke engines used for dirt bikes. They all have the same type of centrifugal clutch. Recently I have ordered a Honda GX-35 (4 stroke) engine and - what a ...
Yanick Salzmann's user avatar
2 votes
3 answers
697 views

Bandwidth vs Capacity

Two questions on wireless transmission, packed into one. First: I am confused about the meaning of the term 'Bandwidth' in a wireless transmission environment. The two most common definitions I could ...
user27435's user avatar
1 vote
0 answers
26 views

Is there any way to simulate belt transsmition with non-circular cog?

I want to do a simulation of a transmission with toothed belt and elliptical gear. I've tried in Autodesk inventor by modeling wheels separately and then adding a belt with the "synchronous belt tool" ...
szymonbiela's user avatar
0 votes
2 answers
195 views

Why does the synchromesh in manual transmissions act on the output shaft?

Wikipedia has a good animation of a manual transmission, but something irks me. If I understood correctly, in the animation, the input shaft is in green, and the output shaft is in cyan. The dog ...
setun-90's user avatar
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1 answer
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Transmission line length with sag

I have a straight-line distance of 250 km between two towers and want to find the length of the transmission line that is between these two towers while accounting for the sag. The line should be ...
OmarAI's user avatar
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2 votes
4 answers
482 views

How can a clutch engage gradually without wearing away very quickly?

Here's an animation of a gearbox and clutch from Wikipedia. I learned to drive recently, and was surprised at how the clutch worked, engaging gradually as I moved the pedal by fractions of a ...
spraff's user avatar
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1 vote
0 answers
94 views

Clutch for high-speed operation (>40 000 rpm)

I'm currently working on a setup where at some operations my motor has to drive a shaft up to the motor's maximum operating speed (12,000rpm) and a torque of ~0.14Nm but at other conditions this shaft ...
steinc's user avatar
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1 vote
1 answer
140 views

Inertia and friction between gears

I have a question regarding inertia and friction between gears. I have a gear which is connected to the rod at one end and an electric motor which is connected to the other end. I know the torque of ...
Nick Chernuha's user avatar
1 vote
1 answer
85 views

How does free space path loss change with receiver's antenna's height

I have a question which seems like an easy one, but I couldn't find anything on Internet to be 100% sure. The free space path loss equation is: $$FSPL=20\text{log}(d)+20\text{log}(f)+20\text{log}(\...
Scavenger23's user avatar
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0 answers
29 views

Torque output of transmission when accounting for moment of inertia

A cable drum is driven by 3 electric motors via a bull gear arrangement. Gear ratio, total motor inertia (including pinion gears) and total drum inertia are known. From the motor variable speed drives,...
K0ICHI's user avatar
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1 vote
0 answers
527 views

Electronic Pressure Control, EPC

In short, the question is: How the EPC affects an automatic transmission? I'm planning to build an automatic transmission controller module, TCM for 4F27E Ford transmission. So far I haven't found an ...
kerob_labs's user avatar
3 votes
1 answer
94 views

How are water-tight transmissions made, like the kind you see on inboard boats, pumps or food blenders?

I want to replicate the kind of interface you see on inboard boats, pumps, or food blenders. Basically, I want put a motor in a sealed vessel, and have it turn a prop outside the vessel, in water. ...
Alex's user avatar
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0 votes
2 answers
376 views

How don't dog clutches collide?

I'm learning about how dog clutches work particularly in sequential transmissions. I'm having a hard time understanding the principle which ensures dogs will always mesh correctly. I can easily ...
php_nub_qq's user avatar
1 vote
1 answer
100 views

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 ...
Marino Klisovich's user avatar
-1 votes
2 answers
675 views

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 ...
Dominik Serbinek's user avatar
1 vote
3 answers
243 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 ...
user avatar
1 vote
2 answers
1k 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 ...
Dominik Serbinek's user avatar
1 vote
4 answers
232 views

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/...
rumple's user avatar
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0 votes
1 answer
76 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?
Dominik Serbinek's user avatar
2 votes
0 answers
170 views

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 $...
Chandan Pradhan's user avatar
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0 answers
698 views

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/...
Gregory Leo's user avatar
0 votes
2 answers
43 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 ...
PhilSheppard's user avatar
-1 votes
2 answers
103 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 - ...
Flywheel's user avatar
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1 answer
80 views

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 ...
W.K's user avatar
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