Catalogues - spherical-roller-bearings

Catalogue Spherical Roller Bearings

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ENGINEERING

DETERMINATION OF APPLIED LOADS AND BEARING REACTIONS - continued


	r	m
	V	J
	^x—	j„:___

BELT AND CHAIN DRIVE FACTORS

Due to variations of belt tightness as set by various operators, an exact equation relating total belt pull to tension F₁ on the tight side and tension F₂ on the slack side, Fig. 11, is difficult to establish. The following equation and Table 4 may be used to estimate the total pull from various types of belts and pulley, and chain and sprocket designs.

(1.91 x 10⁷) H /_BLTn

(newtons)

(1.26 x 10⁵) H /_B


	Type
	Chains, single..............................................	1.00
	Chains, double............................................	1.25
	"V" belts......................................................	1.50

(pounds-force)

Standard roller chain sprocket mean diameter:

L =

180 N

sin

Table 4. Belt or chain pull factor based on 180 degrees angle of wrap.

TRACTIVE EFFORT AND WHEEL SPEED

The relationships of tractive effort, power, wheel speed and vehicle speed are:

SHOCK LOADS

It is difficult to determine the exact effect that shock loading has on bearing life. The magnitude of the shock load depends on the masses of the colliding bodies, their velocities, and deformations at impact.

The effect on the bearing depends on how much of the shock is absorbed between the point of impact and the bearings, as well as whether the shock load is great enough to cause bearing failure. It also is dependent on frequency and duration of shock loads.

As a minimum, a suddenly applied load is equivalent to twice its static value. It may be considerably more than this, depending on the velocity of impact.

Shock involves a number of variables that generally are not known or easily determined. Therefore, it is good practice to rely on experience. Timken has years of experience with many types of equipment under the most severe loading conditions. Your Timken representative should be consulted on any application involving unusual loading or service requirements.

F_t V

—_- (for H in kilowatts, V in kilometers per hour and F_t

3600 in Newtons)

H =

^Fte ^V (for H in horsepower, V in miles per hour and

H =

375

in pounds)

and

5300V ~L

336V

n =

(for n in revolutions per minute, V in kilometers per hour and D_m in millimeters)

n =

(for n in revolutions per minute, V in miles per hour and D_m in inches)

CENTRIFUGAL FORCE

Centrifugal force resulting from imbalance in a rotating member:

F = ^Fw ^r ⁿ² (newtons)

8.94 x 10⁵F r n²

(pounds-force)

3.52 x 10⁴

SPHERICAL ROLLER BEARING CATALOG