Journal Bearing Design
Journal Bearing Design
(OP)
Hi Everyone,
I am helping a colleague with a equivalency mock exam and we cannot agree on the answer to this question:
A journal and bearing are to be designed for a shaft that turns at 250 rpm. Suppose
ISO VG100 (SAE Engine 30) is to be used as lubricant and the bearing length is to be equal to
1.2 times the diameter. If the no-load power loss is not to exceed 2.5 x 10-4 horsepower and the
diametral clearance is 0.0045 times the diameter, estimate the maximum diameter that can be
used for the journal, and the allowable temperature limit.
Any help would be appreciated, it's been forever since I've even cracked my Shigleys!
I am helping a colleague with a equivalency mock exam and we cannot agree on the answer to this question:
A journal and bearing are to be designed for a shaft that turns at 250 rpm. Suppose
ISO VG100 (SAE Engine 30) is to be used as lubricant and the bearing length is to be equal to
1.2 times the diameter. If the no-load power loss is not to exceed 2.5 x 10-4 horsepower and the
diametral clearance is 0.0045 times the diameter, estimate the maximum diameter that can be
used for the journal, and the allowable temperature limit.
Any help would be appreciated, it's been forever since I've even cracked my Shigleys!
Talk To Other Members
RE: Journal Bearing Design
RE: Journal Bearing Design
RE: Journal Bearing Design
Torque = r x A x Fn(t) (r=radius, A = brg surface area, t = clearance, Fn = "some function of")
= D/2 x (Pi x D x 1.2D) x Fn(0.0045D)
You can do the rest.
je suis charlie