# Questions tagged [transmission]

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### How to prove the horizontal and vertical tension of transmission tower?

Assume there are three transmission towers,A ,B and C,and B is connected A and C with two transmission lines,$L_{AB}$ and $L_{BC}$ I have formula of horizontal and vertical tension of transmission ...
13 views

### Why is my connection over ASDL better with a vpn?

I notice that the quality of my connection over ASDL seems better when I'm connected to a VPN. Is there any specific reason to this ?
39 views

### Does moving the idler in a wheel and disk CVT conserve energy or momentum?

Consider the wheel and disk CVTs (continuous variable transmissions) below. Configuration A comprises a CVT disk coupled to the "system under control" 's', whereby a control wheel 'cw' ...
110 views

### Would you wear out the/a clutch in a modern automatic transmission if you drove 5000 km at 1 km/hr?

If you drive a (modern or old) manual transmission car for 5000 km deliberately at 1 km/hr, you will burn through the clutch (long before you reach your destination). The idea is this. If you attempt ...
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19 views

### Transfering rotation to translation in most precise way?

i am trying to make a very precise machine which will use a very precise linear encoder (nm range) and very precise servo motor. I want to use servo motor rotation to precisely move a "thing"...
53 views

### 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 ...
43 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 ...
63 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 ...
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17 views

### 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?
104 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 ...
158 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 ...
1 vote
115 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 ...
1 vote
420 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 ...
23 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 ...
268 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 ...
1 vote
399 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 ...
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1 vote
41 views

### 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 ...
145 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 ...
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226 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 ...
146 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 ...
63 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 ...
50 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 ...
1 vote
369 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 ...
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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
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266 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? ...
83 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 ...
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1 vote
51 views

### 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 ...
419 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 ...
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198 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 ...
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1 vote
1k 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-...
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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 ...
940 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 ...
1 vote
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" ...
240 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 ...
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110 views

### 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 ...
553 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 ...
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1 vote
103 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 ...
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1 vote
193 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 ...
1 vote
102 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}(\...
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30 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,...
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1 vote
650 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 ...
98 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. ...
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426 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 ...
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1 vote
106 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 ...
708 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 ...
1 vote
264 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 ...
1 vote
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 ...
1 vote
237 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/...
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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 \$...