The friction is a function of the localized deformation you will have. The harder the material the lower your deformation. The harder material (non magnetic) we used were PH steels (15-5; 17-7; etc.) that get to ~40HRC.
You can machine the raceways form this material.
Try this. It has some fixed cycles (triangular and trapezoidal with 1/3 acc, 1/3 steady-state and 1/3 deceleration) as well as a trapezoidal with varying times.
http://files.engineering.com/getfile.aspx?folder=b1bc1716-2b18-444e-975e-7ffde2710d1f&file=Motion_Profile.xls
There are articles out there on the benefits/drawback of finishes and those are application specific. In bearings (or any Hertzian contact with relative motion), the surface finish cannot be too good or the ability of the oil to form a EHL film is impaired. In roller rocker (the follower od)...
I read the question late. In automotive suspensions (i.e. McPherson struts), designers tend (or at least did so it the 80's) to include thrust bearings to accommodate the spring rotation during compression/extension to improve the NVH of the vehicle itself. These bearing cartridges were...
In a preloaded set of tapered roller bearings without external loads, the net axial force is 0, though there is strain at the interfaces where the preload is applied (flanges, bolts, etc.).
The thrust forces in a tapered roller bearing arrangements using a specific bearing size are a fixed...
Tmoose,
The design rule of thumb I mentioned before is as follows:
Shafts Center distance [mm] = 30 x (torque [kgm])^(1/3)
This is from the older fellow I met years ago that designed most of Iveco truck transmissions.
If you have the formulae for point contact, then you have the formulae for elliptical contact. Point contact is a special case of elliptical contact (at least it is treated that way by all of the texts I have.
The issue you will have to calculate the subsurface stress, is the ability to...
I have heard of a general formula used by the European industry to determine the maximum torque that can be safely transmitted for a given shaft center distance in a cascade automotive gearbox. It was mentioned to me, about 20 years ago, by an Iveco engineer that had been in the business of...
To increase your system load ability you can use angular contact ball bearings, as long as they are suitably matched for stacking, or specially produced thrust cylindrical roller bearings (called "tandem"). The latter were specifically designed for applications with limited radial space but...
Wind drag force is a function of the square of the velocity. Wind drag power is a function of the cube of the velocity. Thus going twice as fast will require 8 times the power.
I believe gas mileage is tied to motive power. At the same speed, the same car should require the same motive power, regardless of gear ratio. The gear ratio will affect the delivery of power to the wheel and the efficiency of the drive train.
A Pontiac GTO with a 6 speed manual transmission...
There are "rules" to select minimum circumferential clearance in full complement bearings. These "rules" are not always published. INA, for example, has an internal document called A315 (I believe my memory is correct) that shows the minimum clearance required as a function of the bearing...
