Questions tagged [wheels]

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Gizmo away from the object in FreeCAD

I downloaded a Mecanum wheel model from grabcad but its Gizmo is away from the Object. Is there any way to correct it? I tried Changing "Position" under "Placement" but its ...
80 views

Friction force between two wheels at constant rpm

I have two tangent wheels pinned at their centers /which coincide with the center of mass/ and torque is applied to one of them (both roll without slipping). I want to find what force would they exert ...
35 views

How to determine minimum and maximum value of lateral displacement in Railway Equivalent Conicity Calculation

I am trying to calculate the Equivalent Conicity for railway application by referring to ...
66 views

Alternatives of rubber sealant cement for finalizing patch-plug repair on car tyre?

I am doing a patch-plug repair for a 2mm puncture injury on my car tire: I have two questions: 1.) The minimum I got at local stores (in India) is a 6mm patch-plug. Do I need to drill/cut the injury ...
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1 vote
66 views

Modeling of Wheel Rolling Resistance

I have been working on longitudinal tire model for a while and constantly encounter problems with the formulation of rolling resistance. Consider one wheel model coming down from a damp. It is a 2DOF ...
• 11
57 views

Minimum power required to drive a vehicle with a Swedish type omni wheels

I'm trying to find the minimal power needed to drive an omidirectional 3-wheeled robot. I already asked in Robotics Stack Exchange and they didn't respond yet. From the equation $P=Fv$ I know I need ...
1 vote
44 views

Derusting car wheel's control arm by soaking in vinegar?

Would it be safe to remove the built up rust on wheels' control arms by soaking them in vinegar? Or is Hydrogen embrittlement a concern for a run-of-the-mill, 10-years old control arm, which is (I ...
1 vote
43 views

Algorithm to detect flat tyre by comparing wheels speeds

So ABS systems are capable of detecting a flat tyre, because it will roll a bit faster (because of smaller diameter). What could be speed difference, needed to detect such fault? Do ABS systems only ...
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83 views

Why can’t we accelerate a rotating object after some point?

If I push an object in a linear way with constant force bigger than frictional force on ground, the object will accelerate more and more until air drag force matches it. Logically, If I add the same ...
• 125
42 views

shaft connected double water wheel to lift water back in closed loop

This is meant for mechanical closed system for hydroponics. Two wheels connected by same shaft so the wheel going down lifts the water back with the other interconnected wheel to a slight incline. I ...
52 views

How to affix a 3/4" keyed bore wheel/pulley to 5/8" D-profile shaft?

How do I affix a 1.5-inch-thick wheel with a 0.75-inch keyed bore (or pulley) to my motor's 1.25-inch-long x 5/8" diameter D-profile shaft (both pictured)"?
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619 views

Tire engineering - are "free rolling" and "slip ratio" defined with respect to a specific tire/road material pair?

Pacjeka states the following on his introduction to tire characteristics: The upright wheel rolling freely, that is without applying a driving torque, over a flat level road surface along a straight ...
• 101
1 vote
44 views

Incremental encoder with memory

I'm working on a robotics project. In this project we need to control the angle position of the wheels. We are going to use an incremental encoder (we didn't find an absolute encoder that was able to ...
174 views

Connecting a brushed direct drive motor to a wheel with no holes in the hub

I am building a 4 wheel drive rover robot. I was very lucky to find four good condition wheel chair motors on the side of the road. I had to disassemble the wheel chairs of course but well worth the ...
• 147
133 views

On a car with all-wheel drive, how does the engine provide the angled front wheels with power?

Obviously, a single solid axle connected straight through the wheels would bend if the wheels to which is was connected were to rotate right or left with respect to a vertical line (i.e. be steered). ...
78 views

How can wheels with spokes concurrent at the center be solid?

A traditional bicycle wheel looks like the left wheel in the image. The spokes are not concurrent at the center. They connect with the hub at a near tangent. Given their length-to-diameter ratio, it ...
• 441
53 views

Is there an optimal camber for fixed wheels rotating around a point?

I'm working on a project where part of a unit needs to rotate around a fixed point, and be supported on two fixed (i.e. not castor) wheels. When experimenting with the wheels, it feels like fixing ...
• 103
358 views

Why does pressure gauge/pump reading drop when the valve is open?

I just used a simple car tire air pump with a gauge like the one in the picture. The device has a handle, a gauge and a button. Squeezing the handle fills the tire with air, and the button releases it....
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What does a dual bearing motor mounting system look like?

I came across the following excerpt about how to mount wheels: The most robust system is the dual bearing system. In this, the wheel axle is mounted on two bearings and chain driven. This takes all ...
• 147
166 views

Why is the direction of static friction towards centre in case of circular turning?

Here , a car turning on a circular track. I have marked all the kinds of friction , velocity happening in the diagram. For the front wheels , VT (Tangential velocity) ,Vr(Radial velocity) , VR(...
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2k views

Why caster angle causes wheels to self-center?

I have no background in Mechanical Engineering. It's intuitive to use an analogy as this guy demonstrated here @3:48 where he used caster wheels you would see in office chairs where the contact point ...
• 151
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For pure rolling , Proof for every point on wheel has velocity = vc + wr

There are 2 texts I have seen for every point on wheels finding out the exact velocity of certain points. The theory states for all is that : Every point on wheel has total v = rotational + ...
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Understanding velocity of points of wheel

I am very grateful to all for helping me out. Thank you. Also , It will be quicker for me to understand if you tell where at which point am I going wrong or right ? This way , I know exactly how much ...
• 679
322 views

How to calculate maximum rpm for a wheel? [closed]

I have a DC motor with a rated rpm of 2750. At max rpm, the rubber wheel that I've attached to it is pulling itself apart (literally, the rubber is being pulled away from the central hub due to the ...
254 views

Effects of rolling resistance on wheel angular and vehicle longitudinal speed

The differential equation for wheel speed can be given as: In here, $T_t$ is driving torque (not braking), $F_x$ is longitudinal force of tyre, $J_w$ is wheel inertia, $\dot{w}$ is angular speed of ...
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170 views

Suspension for a 135kg velomobile

I'm designing a four-wheel velomobile as a small city bike with good weather protection. The top speed in the city is about 25km/h (7m/s). The total weight of the velomobile is 35-45kg, and I expect ...
1 vote
84 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 the tyres' longitudinal force (tractive force) using some of the inputs. You can see one of the examples below. In ...
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114 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?
• 115
1 vote
511 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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199 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. ...
• 45
66 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....
143 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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1 vote
132 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 ...
67 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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256 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 ...
1 vote
176 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? ...
48 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 ...
371 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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10k 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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92 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 ...
208 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 ...
1 vote
77 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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6k 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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1 vote
100 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 ...
1 vote
240 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 ...
10k 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 ...
586 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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1 vote
279 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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1 vote
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 ...