What is Axle: Definition and 100 Discussions

An axle or axletree is a central shaft for a rotating wheel or gear. On wheeled vehicles, the axle may be fixed to the wheels, rotating with them, or fixed to the vehicle, with the wheels rotating around the axle. In the former case, bearings or bushings are provided at the mounting points where the axle is supported. In the latter case, a bearing or bushing sits inside a central hole in the wheel to allow the wheel or gear to rotate around the axle. Sometimes, especially on bicycles, the latter type axle is referred to as a spindle.

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  1. C

    What is the most efficient way to solve a wheel and axle system problem?

    Homework Statement Hello folks, here is a problem: The effciency of a wheel and axle system is 80% and the ratio of radius of wheel of axle is 4:1. In other to lift a mass of 20 kg, the effort required is A.60N B.62.5N C.32.5N D.250N E.50N Homework Equations I made use of the...
  2. B

    Calculating Torque Split in Axle Differentials

    Folks, I am trying to see how the torque is split 50:50 in a standard axle differential mathematically or via a free body diagram. Does anyone know? Thanks
  3. B

    Can Ductile Iron Withstand the Torsional Stresses of Front Axle Shafts in Jeeps?

    A fellow on a Jeeping forum contends that axle shafts used in Jeep CJ Dana 30 front axles are made of ductile iron. I say they are made of a forged carbon steel similar in composition to 1040 or 1050 which I understand is commonly used in OEM axle shafts. Is it possible for ductile iron to...
  4. C

    Calculating Efficiency in a Wheel and Axle System

    Hello folks, here is a problem: The effciency of a wheel and axle system is 80% and the ratio of radius of wheel of axle is 4:1. In other to lift a mass of 20 kg, the effort required is A.60N B.62.5N C.32.5N D.250N E.50N I started by bringing out the data in the question: Effiency...
  5. E

    Finding Moment of Inertia of axle

    Homework Statement Not really a HW problem (no diagram), I just need to figure out this number for a design. I have an axle with two crank arms attached to either end, pointing in opposite directions. The entire thing will spin. I need to find the equivalent moment of inertia of the axle...
  6. A

    Achieving speed of light via rotation on an axle?

    I was reading about dentist drills, and I discovered an amazing piece of trivia about them: modern dentist drills spin at 400,000 revolutions per minute (over 6666 times per second!). So I thought, if this was spinning a large wheel, whose outer rim would rotate at a rate progressively faster...
  7. M

    Mass needed to rotate wheel and axle (rotational motion)

    I'm sorry for posting another thread but I'm totally lost here.. Homework Statement A wheel and axle having a totel moment of inertia of 0.002kgm is caused to rotate about a horizontal axis by means of an 800g mass attached to a cord wrapped around the axle. The radius of the axle is 2cm...
  8. A

    Moment of Inertia of a drum with center axle

    I am confused with how to find moment of inertia of composite example. Like a hollow shell having one disc at each end and a shaft in the centre. How to find out Moment of Inertia if Force is applied tangentially on the shell and if force is applied tangentially on the shaft. Should I sum up...
  9. B

    What is the formula for calculating the maximum deflection of a bike axle?

    My Question... To find the maximum deflection of this axle, can the formula: (W*a/24*E*I)*(3*l^2-4*a^2) Will the total length simply be 370mm(wheel to wheel), or will I have to include the total length of the axle?
  10. P

    RPM of axle from velocity of car

    Homework Statement I have to derive an equation that relates the rpm of an axle that is fixed to a car wheel of radius r, given the velocity of the car subscripts: w is wheel, a is axle Homework Equations angular velocity of the wheel is given by ω_wheel=2π/T=2πf=v/r_w (1)...
  11. R

    Find Axle of Rotation for Force on Rocket in Space

    I was wondering, if say a rocket in space receives a force perpendicular to its body (on some point on the body), how would one find the axle in which the rotation occurs? Would it be along its center of mass? Thanks.
  12. E

    Rotation- is axle or wheel rotating?

    What determines if something is rotating? For example, if we have a spaceship with a fake gravity rotation thing, how do we know if the outer ring is rotating or if it is stationary and the inner axle is spinning? Normally we could just say its all relative, etc, but weather or not you feel...
  13. R

    How can I predict the motion of an axle in contact with a wheel?

    I was trying to figure out the motion of an axle in simple dry contact with the inner race of a wheel (see attachment). Even with simplifying assumptions there seemed to be no solution with steady motion except for very special cases (a particular location of the axle in the wheel hole and a...
  14. C

    Rotational Kinematics - The differential gear of a car axle

    Note - pi is not meant to be an exponent, not sure why it looks like one... Homework Statement The differential gear of a car axle allows the wheel on the left side of a car to rotate at a different angular speed than the wheel on the right side. A car is driving at a constant speed...
  15. G

    Force of friction between wheel and axle

    I've been working on a simulation of a Lorenz Waterwheel, and friction was killing it - I couldn't use realistic coefficients of friction. The problem, I discovered was that I was not using the correct equation to calculate the force of friction that counters the wheel's rotation. Having...
  16. E

    Force exerted by a stick on its axle?

    Homework Statement A stick of uniform density with mass M = 8.6 kg and length L = 0.7 m is pivoted about an axle which is perpendicular to its length and located 0.24 m from one end. Ignore any friction between the stick and the axle. What is the magnitude of the vertical component of the...
  17. M

    How much ahead the front axle does the wheel jet the water that it pick

    Homework Statement [/B A bicycle with a speed 12 km/h is driving along a leveled wet road. How much ahead the front axle (see picture) does the wheel jet the water that it picks up from the floor?The radius of the wheel is r = 35 cm. Let’s suppose that the drops of water that are separating...
  18. M

    How much ahead the front axle does the wheel jet the water that it pick

    Homework Statement A bicycle with a speed 12 km/h is driving along a leveled wet road. How much ahead the front axle (see picture) does the wheel jet the water that it picks up from the floor?The radius of the wheel is r = 35 cm. Let’s suppose that the drops of water that are separating from...
  19. T

    Attaching Wheels & Axles: A How-To Guide

    I've got two 14 inch wheels and now I need to attach them so that they rotate on one axle. I also need to put a free hub so that when I stop peddling the wheels keep rotating. How would I do this. I really need to know even if it's a stupid question.
  20. M

    Differential is not necessary for the front axle

    why is it that the differential is not necessary for the front axle and is only in the rear axle?
  21. C

    Solving for Stress on Front Axle: Angular Momentum to Force

    I have a problem with finding stress on this front axle. The problem gives the angle at which the car is raised (front wheels off the ground) and the speed its going. It states the car comes to an immediate halt, dropping the front end. It asks to find the force the front end will withstand...
  22. A

    Explaining Frictional Torque at the Axle

    Let us consider a wheel which rotates about an axle thorugh its center with an angular velociy \omega0. After sometime it comes to rest due to the frictional torque at its axle. Now, if we go by the defination of torque than it is defined as: \tau= r x F. Since the frictional torque is exerted...
  23. K

    Torque about the axle of a rotating disk

    Homework Statement "The 19.8 cm diameter disk rotates on an axle through its center. F1=18.1 N, F2=26.6 N, F3=26.6 N, F4=18.1 N, and d=4.64 cm. What is the net torque about the axle? " http://i4.photobucket.com/albums/y111/kathy_felldown/kn-pic1314.png I have two questions about this...
  24. Saladsamurai

    Axle DesignIs there a common Method for this?

    Okay, so I am trying to analyze the reaction forces that are induced by a loading on this axle. I am running into a problem because my sum of moments equation is not independent of my force summation. That was due to a poor choice of a point to sum the moments about :blushing: So I could do...
  25. C

    Block hits a rod with axle in middle

    A cube of mass m slides without friction at speed v0 and undergoes a perfectly elastic collision with the bottom tip of a rod of length d and mass 2m. The rod is pinned through its center through a frictionless axle. And initially hangs straight down at rest. What is the cubes velocity both...
  26. X

    Angular Acceleration, 2 Pulleys on common axle

    Note: This is similar to 2 previous questions I've seen here (https://www.physicsforums.com/showthread.php?t=261193"), and while this is my first post, I've lurked/found this site to really be helpful in getting me to be able to figure out how to solve problems I have with my physics homework...
  27. A

    What is the net torque about the axle?

    Homework Statement The 19.6 cm diameter disk rotates on an axle through its center. F1=22.8 N, F2=32.5 N, F3=32.5 N, F4=22.8 N, and d=4.60 cm. What is the net torque about the axle? Homework Equations Torque = F r sin (angle) F = m g The Attempt at a Solution I found all the...
  28. DaveC426913

    Bad rear axle shocks very common?

    Some point a while ago while driving I noticed a car whose rear wheels were noticeably bowed outward, thus: Now, wherever I go I notice cars like this. Always the rear wheels, never the front. It seems to be very common. Is this due to bad shocks? Is there an epidemic?
  29. M

    String energy transfer from mousetrap to axle of wheels

    Well, we have a Physics project which requires us to build a car and power this using energy provided by a mousetrap. We may not add other energy sources to power the car; we can only use the mousetrap provided to power the car. Homework Equations Now, thinking about strings and...
  30. N

    Finding the Axle Force on a Pulley System

    Homework Statement A 12.0kg box resting on a horizontal, frictionless surface is attached to a 5.00 kg weight by a thin, light wire that passes over a frictionless pulley. The pulley has the shape of a uniform solid disk of mass 2.00 kg and diameter 0.500 m. After the system is released, find...
  31. G

    What are the mechanics behind the wheel and axle simple machine?

    I have a question about the simple machine: the wheel and axle. I know already that mechanical advantage through a wheel and axle system is achieved by force being applied through the wheel to turn the axle. This mechanical advantage would be in the form of you applying less force, but over a...
  32. G

    Can you explain the mechanical advantage of a wheel and axle?

    I have a question about the simple machine: the wheel and axle. I know already that mechanical advantage through a wheel and axle system is achieved by force being applied through the wheel to turn the axle. This mechanical advantage would be in the form of you applying less force, but over a...
  33. J

    How Do You Calculate Shear Force and Bending Moments in Stub Axles?

    i have been set a question to draw the shear force and bending moment diagrams for the loading condition shown on the diagram, and am not quite sure how to do this... do i need to work out other forces along the diagram? and help...much appriciated thanks!
  34. A

    How can I prevent my shoulder bolt axle from causing my wheels to lock up?

    Coaching grade school track, I have to carry around several starting blocks. Last year, to store for the next season, I made a rude carrier from 3/4 plywood that held 5 blocks, stacked on top of each other. I put wheels on the back of the cart, using shoulder bolts, which the kind man at Home...
  35. S

    Calculate the net torque about the axle of a wheel

    Homework Statement Could someone explain this problem a little better to me. Problem: Calculate the net torque about the axle of the wheel shown in Fig. 8-39. Assume that a friction torque of 0.45 m·N opposes the motion and that F = 18. *see attachment for picture. I'm confused...
  36. A

    What is the net torque on the pulley about the axle

    Homework Statement What is the net torque on the pulley about the axle if T1 = 18N and T2 = 34N? http://i241.photobucket.com/albums/ff4/alg5045/p13-11.gif Homework Equations The Attempt at a Solution Torque is really confusing me. I have no ideas as to how to start this problem.
  37. A

    X and y components of the force that the axle exerts on the pulley?

    Homework Statement A 12.0-kg box resting on a horizontal, frictionless surface is attached to a 5.00- kgweight by a thin, light wire that passes over a frictionless pulley. The pulley has the shape of a uniform solid disk of mass 2.50 kg and diameter 0.440m . What are the x and y...
  38. A

    Flywheel slows due to friction in its axle bearings

    Homework Statement A high speed flywheel in a motor is spinning at 450 rpm when a power failure suddenly occurs. The flywheel has mass 35.0 kg and diameter 74.0 cm. The power is off for 33.0 seconds and during this time the flywheel slows due to friction in its axle bearings. During the time...
  39. S

    How Does the No-Slipping Condition Affect Wheel Rotation Dynamics?

    I have a question about this problem. A rotationally symmetric axle wheel system is smoothly joined to a fixed point O. l=distance from O to CM m=mass of axle wheel system R=Radius of wheel Is and I are the principal moments of inertia relative to CM. The axle is horizonal as the wheel...
  40. M

    Angular acceleration of an axle

    A disk with a radial line painted on it is mounted on an axle perpendicular to it and running through its center. It is initially at rest, with the line at theta 0 = -90°. The disk then undergoes constant angular acceleration. After accelerating for 3.1 s, the reference line has been moved part...
  41. T

    Calculate Bending Moment & Stress of Axle w/ 300N Load

    Calculate the bending moment in the centre of the axle?? What limit stress is valid for this loading case ? may i know how to form the moment eqn?? F=300N picture - http://files.filefront.com//;5410274;;/ pls help thanx
  42. K

    Understanding Differential Angular Speeds in Wheel and Axle Systems

    I'm trying to figure out the following problem but I don't know where to begin: Two wheels of diameter 0.78m are attached to opposite ends of an axle of length 1.6m. The wheels roll around a circular track of inside radius 9m. a) Through what angle around the circular track must the axle...
  43. F

    Relative Motion. Wheel and axle.

    This is the PROBLEM: Flinstone has a problem too. He built a beam mover, described below (on the attachment, DOC file, look down), but can't figure it out. Perhaps you can help. Two identical wheels and axles sets were carved from from logs. In each set, the 50 cm diameter wheels and the 14...
  44. E

    Build My Car: Finding the Right Axle

    well I am building my car, now the paper recommends that you use paper clips that are like unfolded. After then you put the paper clip inside a rolled up piece of paper. but i can never seem to get the paper clip like exactly straight. The paper clip is the axle. So when ever the car moves the...
  45. O

    Revamping My Scooter with 12V LED Neon Sticks & Axle Generator

    I have a scooter, which looks like this one http://img47.imageshack.us/my.php?image=gsra3eng9zq.jpg and i have two 7.2 volt battery packs to run two 12 volt led neon sticks that would sit underneath the deck and light up and look cool :rolleyes: . Well this works, but i think the voltage...
  46. C

    Calculate the net torque about the axle of the wheel

    This problem is due on my webassign homework in 3 hours and I can't get it right! Calculate the net torque about the axle of the wheel shown in Fig. 8-39. Assume that a friction torque of 0.43 mN opposes the motion and that F = 26. The picture is here...
  47. M

    Designing a Mouse Trap Car: Wheels and Axle

    Hi all, new guy from CT. We were just assigned a project in physics to build and design a mouse trap car powered solely by the potential energy of a standars mouse trap. The main focus is distance, and so that is what I am aiming for. I have my basic design laid out, as I will attach two...
  48. P

    What is the component of the total angular momentum along the axle?

    Two lightweight rods d = 23 cm are mounted perpendicular to an axle and at 180° to each other. (Fig. 11-24). At the end of each rod is a 700 g mass. The rods are spaced 40 cm apart along the axle. The axle rotates at 41 rad/s. http://www.geocities.com/sinceury/11-24alt.gif (a) What is...
  49. K

    Calculating Horsepower from 100 kgs Load on 10cm Axle with 3 Arms

    Please let me know the equation to calculate the following i have a mass of 100 kgs i have an axel of 10cms diameter connected by 3 arms 120 degrees apart. the length of the arm is 100cms i want to know that if the load is dropped from above, that is when the arm reaches on the top...
  50. C

    Acceleration of a Spindle System with Two Disks and a Solid Axle

    How would I find the acceleration of the above spindles (both left and right instances)? The spindles are composed of two disks with a cylindrical solid axle. The left spindle is unwinding the string as it rolls and the right spindle is winding the string as it rolls. Static friction is present...
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