Questions tagged [wheels]

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33 views

Why is longitidunal force of tyre calculated negative in SIMULINK?

With the help of the Vehicle Dynamics Blockset of SIMULINK, it is easy to obtain longitidunal force (tractive force) of tyre by some of inputs. You can see one of examples below. In this simulation, ...
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1answer
34 views

How to mount skateboard wheels to an t-slotted framing

What is the best way to attach skateboard wheels to an t-slotted framing? Also, is there a more economical way? Bonus: How to design shock absorber for it?
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1answer
49 views

Pacejka's Magic Formula:Nominal vertical load on tire

To work with Magic Formula for load dependent conditions, we have to use some of additional parameters. In this link, you can find the formula about this. What is the meaning of Fz0 (Nominal vertical ...
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1answer
48 views

Magic Formula: Calculating of lateral forces

To obtain lateral force according to slip angles, I use Pacejka Magic Formula, but my graph's style is not similar with picture which i added. I cannot find where the mistake is. ...
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0answers
33 views

How far have we developed eco-friendly tyres alternatives?

Considering how bad rubber tires is for environment (Microplastic on tyre - NatGeo), Today tires consist of about 19 percent natural rubber and 24 percent synthetic rubber, which is a plastic polymer....
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0answers
36 views

Optimum spoke shape for wheels made of solid material

Currently I am designing a bicycle sprocket to be laser-cut out of 3mm steel. Steel is heavy, so I want to make some lightening cut-outs, and I want to optimize the shape of the cutouts. I will ...
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1answer
20 views

Does a single-wheel brake intervention from ESC cause one wheel to be not brakeable by the driver?

Source: https://www.kfz-tech.de/Engl/Buchprojekte/HBremse/ESP3.htm Firstly, I don't know if this is the right StackExchange, but I will try nevertheless. Above I posted a picture of the hydraulic ...
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1answer
59 views

How to get a wheel pump to deposit water near the top of the wheel?

Suppose I have a wheel, about 6 feet in diameter, with empty soup cans affixed around it, powered by a big windmill. This drawing only has four spokes, but there will be more: ...
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1answer
101 views

Rover Wheels: Convex or Flat?

I was comparing the wheels of the Curiosity rover and the Perseverance rover and noticed that the latter had a very flat cylindrical design as compared to the former. This got me thinking about which ...
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1answer
40 views

How does the friction on the front and rear wheels of a car vary?

Consider a Rear-Wheel Driven car. The questions refer to friction between the wheels and the road. 1.Direction of friction on the front and rear wheels when car accelerates? Is it static or kinetic? ...
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2answers
27 views

Meeting point of turning wheels with rear wheels

I was watching this video about how steering on a vehicle. It states: If you track the meeting point of the left and right wheels, you can see that the meeting point always lies on the rear wheel ...
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1answer
83 views

Determine if car is moving forward or backward

I would like to know if there is someway i can figure out if the car wheel is rotating in clockwise or anticlock wise direction. Im working on a project which determines if car rolled back on a hill ...
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6answers
7k views

What is the purpose of these “partially filled in” locomotive wheels?

I recently visited a railway museum with a lot of Soviet-era locomotives. The picture below shows the wheels on a locomotive from the 1930s or 1940s. Some of the wheels are thicker on one side (as it ...
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1answer
56 views

Car trajectory with angled rear wheels (non-Ackerman)

Consider a four-wheel steering vehicle in which: The front wheels follow Ackerman condition The rear wheel are rotated with a fixed angle (dir == dor in the picture below, and such angles do not ...
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2answers
86 views

Faster car drifting (motorsport) when using limited slip vs welded differential

I have been drifting RWD (rear wheel drive) cars for some years now. I tend to think about every engineering solution that other drivers use and how does it work before applying it to my car. What ...
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1answer
48 views

Help me build a mechanical gizmo involving a pulley (I think)

Electrical engineer here. I'm looking to build an incredibly simple mechanism that in my mind involves kind of a pulley. Below is a diagram. So it's essentially like a mechanical servo. I would like ...
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1answer
191 views

How can I calculate the power and torque required for the motor on a wheeled robot/vehicle?

How can I calculate the power and torque required for the motor on a wheeled robot or vehicle if a particular acceleration or movement up an incline is required?
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2answers
77 views

My robot is not able to maintain balance while turning

I am making a robot for my college project. For now, the robot simply has to move forward, reverse, right and left. While the forward and reverse thing is very smooth but while taking a turn it ...
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1answer
72 views

What wheel setup on a small, solar powered car, would have the least rolling friction?

We are attempting to design a solar car. The solar panel 4 1/2" x 13". I like to break these problems into their simplest form, in order to eliminate the least amount of possibilities. So, the goal ...
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3answers
2k views

Why is a cart with swiveling casters in front stable, but not if the swiveling casters are in back?

Consider a four-wheeled cart that has swiveling casters for the two front wheels, and has wheels that don't swivel in back. For example, a common shopping cart, or trolley if you prefer. If such a ...
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3answers
211 views

Dead mans brake on a hand-pushed wheelchair

Would it be possible to install a dead-mans brake on a wheelchair? I have been calling around and wheelchairs do not seem to come with a dead-mans brake. With that i mean the brake found on airport ...
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1answer
83 views

Pacejka “Magic Formula” tire models origin of the name

It might be a little off topic but I'm trying to find source for why is that model called magic formula? I read that it's a simple function of commonplace functions, a data fitting. Is it simply an ...
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1answer
60 views

Calculate Rolling Resistance Experimentally

I am trying to calculate the exact rolling resistance ($F_{rr}$) of my car. The approach I am going with is a coastdown test at a low speed so no drag slows down the car. From there I am going to ...
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1answer
503 views

Can a rolling wheel create a side force without first rotating on a vertical axis at its contact patch? [closed]

There is something wrong with the way we describe how a cornering vehicle wheel creates a cornering force. I think a rolling wheel must first rotate on a vertical axis to then create the cornering ...
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3answers
186 views

Why is the rear wheel of the Penny-farthing so small?

I see a lot of people asking why the Penny-farthing's front wheel is so big, and I think I've read enough materials to understand why (at least, at the most basic level). But even so, I feel that the ...
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5answers
657 views

What makes scooters unstable at high speeds?

Scooters and skateboards are obviously meant for slower speeds, below 5 MPH. Typically if you go faster than that, it becomes harder and harder to control the scooter, and you will fall off. An ...
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0answers
336 views

How to regulate torque/RPM on an IWD vehicle

Generally, I'm interested in simple (DIY) electric vehicle design problems. I saw some photos of electric vehicles as in the following pic: or also you could check this youtube video. The vehicle is ...
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0answers
97 views

Cone shaped train wheels

I was watching this Feynman video and (as usual) his explanations make a lot of sense. Now I just took a train, and am not so sure anymore. Looking at the train wheels they did not appear cone ...
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2answers
514 views

What is an advantage/disadvantage of difference wheels size in front and rear of a bicycle?

Suppose there is a vehicle with difference size of wheels in front and in rear. Specifically bicycle, There would be 2 cases that front wheel larger than rear wheel and vice versa I would like to ...
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3answers
224 views

What mechanism can make a wheel turn in discrete steps?

I want to make a wheel that behaves pretty much like a mouse wheel does — when you rotate it with your finger and release, it rotates back or forward by itself to match a nearest discrete position. ...
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1answer
405 views

How do I attach an electric motor to a trailer wheel?

I have an electric motor which is intended for a bicycle/scooter and has a 11-teeth chain sprocket. I plan to use it to spin a trailer wheel (which have 4 holes for bolts about 3'' from the center). ...
2
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0answers
90 views

Torque needed to keep a wheel spinning at high RPM

I have a treaded wheel which is 16'' diameter and 4'' across (trailer wheel). If I want it to spin constantly at 2750 RPM, what amount of torque do I need to apply to combat friction and air ...
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2answers
154 views

Surprisingly Low Efficiency of Compound Machine [Project Help]

I'm working on a school project that requires us to build a compound machine with a mechanical advantage of 9. It should be able to lift a 10oz soup can three or more inches by using the weight of ...
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1answer
29 views

Compression and check valves

Pressure pumps are used to apply pressure to a system. What would happen if someone attempted to fill, for example, a bicycle tire (with a check valve) to 2 ATM of pressure using a pressure pump that ...
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1answer
114 views

How To Mount a Large Diameter Tire To A Smaller Diameter Axle? [closed]

I am building a cart from (What Type of Tires and Wheels Do I Need to Make a PVC Beach Cart?). I have a wheel whose central diameter is 3 inches and the PVC for the axle is 1 inch in diameter. I am ...
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3answers
3k views

Reason of Using exactly 5 Wheel Studs per Wheel

So today when I was taking a taxi and looked at the vehicles, I observed that the majority of the light vehicles (i.e. 16-person minibus/ 4-6 person cars) use 5 (or less frequently, 6) wheels studs ...
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3answers
168 views

Why are automotive brakes set inside the wheels, and not on the axles?

In most (maybe all?) automobiles, the drum or disc brakes are positioned at the end of the axles, inside the wheel. This increases unsprung mass, which reduces handling performance. Would it not be ...
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1answer
134 views

Why do baseball pitching machines have wheels stacked instead of side by side?

I was working on a project where I have to launch a ball. The current design has two wheels that are side by side with the ball going between them. I noticed that in almost every commercial ball ...
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1answer
905 views

How to make wheel rotate slower in one direction than the other?

For one axle with one wheel, can the following rules be met and if so, what would be the most simplistic implementation? Rule #1. Axle rotates clockwise: Wheel rotates at a 1:1 ratio with the axle. ...
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2answers
1k views

How to add traction to a wheel?

I am not a professional in engineering and was wondering what I could use to add traction to a wheel. (I have to make a small self-car for a school project) I was wondering if there was a cheap or ...
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1answer
11k views

Difference between a “Pulley” and a “Wheel and axle”

A "Pulley" and a "Wheel and axle" seem much similar to each other. What is their actual difference and what are their precise definitions? My understanding of the two terms is much relied on the ...
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2answers
383 views

Is a chair with N+1 wheels ever less stable than a chair with N wheels?

My workplace has a policy to provide standing desks upon request, but no policy to provide chairs of matching height. (I work for the government...) We can buy our own, or build our own. However ...
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2answers
3k views

Force required to move object on wheels

I'm trying to find the best way to move a heavy weight around. Probably the best way is to put it on wheels but I don't know which physics concepts it involves so I can make a better research. I have ...
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1answer
792 views

How do I model the friction on a rolling pulley wheel, which holds weight, on a horizontal cable?

I am currently designing a motorized zipline trolley that will carry a person on a horizontal cable, so I am trying to calculate the friction on the wheels to determine what kind of motors I need. I ...
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2answers
161 views

Equation for comparing force delivered to road at wheel based on varying gear ratios?

By introducing many new gears and changing the tire size I am altering the torque delivered to a rear bicycle wheel from an electric motor. This then changes the "power where rubber meets pavement". "...
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2answers
108 views

Can a six-wheeled F1 car have a better acceleration profile than a typical F1 car? [closed]

I wonder whether the P34 died too soon. Basically, I'm wondering whether the additional pair of wheels could have conferred the car any advantages that, if solved, would have given it an advantage ...
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1answer
245 views

Does toe-in in the wheels of a car help with straight-line stability without steering?

For vehicles that cannot steer (built to travel in a straight line) does having the wheels toe inwards help with straight line stability? That is, will it make the vehicle go straighter with slight ...
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0answers
173 views

How is rolling resistance accounted for in the Pacejka Curves?

I am simulating the acceleration of a car (FSAE) in a straight line. I have data of the Pacejka Curves ($F_x$ vs. $SR$) of the tire we will be using. The thing is that the curve doesn´t pass through ...
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1answer
1k views

Pacejka Formula - natural values

For my racing game I am using a simplified Pacejka Magical Formula: $\mu_{lateral} = \mu_{0} * \mu_{1} * D * \sin(C * \arctan(B * x - E * (B * x - \arctan(B * x))))$ Where: $\mu_{lateral}$ is ...
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2answers
413 views

Wheel rolling resistance

I think that some of you know what is rolling resistance. It is force that works in opposite direction to roll and is caused due to deformation of tire. It also affects car wheels. There is one ...