Tolomatic Power Transmission Products - Tolomatic, TOL-O-MATIC - (Version JPG) - Page n° 101 - PDF Catalogue | Technical Documentation

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Linear actuator, Electric motor, Spring applied brake, Servo-controller, Cylinder

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Caliper Disc Brakes E^rTT^

SELECTION: FORMULAE: VEHICULAR

M VEHICULAR APPLICATIONS FORMULAE

features

applications

selection graphs

pneumatic brakes

p10

p20

p220

hydraulic

brakes h10 h20 h220 h220i

h441

h960

hydraulic/ mechanical

brake

combos

h/me20 h/me220

mechanical brakes

me10

me20

me220

mb3

spring applied brakes

fs20

fs220

fs220i

fs595

discs hubs & bushings

tension control

combinations intensifier selection worksheet

Calculation of Torque Required

wr[ ^a₊±-g 100

Dynamic T =-—--

(D)

Calculation of Heat Generation and Required Dissipation (Vehicular)

[24]

[27]

WV²


Where;	T		Torque perAxle, vehicle, or wheel; in-lbs
	W		Weight on axle including weight transfer, if any, vehicle or wheel; lbs.
	R		Loaded tire radius; in.
	g		32.2 ft./sec²
	b	=	% of grade
	D	=	Gear Reduction, if drive line mounted
And	a	=	Deceleration rate; ft/sec²
V a = — = f	2S		[25]
Where;	V	=	Velocity of vehicle, ft./sec., at moment of brake application
	t	=	Stopping time required; seconds
	S	=	Stopping distance of vehicle; ft.

Where: E = Kinetic Energy; ft-lbs

W = Weight of axle, vehicle, or wheel; lbs.

V = Design speed of vehicle; ft/sec.

stopping \

[28]

BTU/hr. = generated

frequency/hr.J

778

Then solving for the number of square feet of exposed disc area to dissipate the heat generated:

[14]

Sq. Ft. Disc Area =

BTU/hr

660

The constant of 660 is based on a maximum disc temperature of 300°F.

If there is a restriction in the disc diameter(s) and there is sufficient time between stops or multiple of stops for heat dissipation then we can size the disc to act as a heat sink.

wrI"-^ "

1_100 _

BTU/hr.

[26]

[9]

Parking T :

(220)(Sp)

Where; Wd = Weight of disc; lbs.

Specific heat of disc may be taken as .12 for steel; BTU/lbs-°F

Refer to Table 1 (page 94) for selection. If your requirement falls outside of the standard(s) you may calculate the required thickness based on the maximum allowable diameter:

Thickness is in inches

Area of maximum allowable diameter; in²

Disc Thickness =

[10]

Where;

If it is found the disc thickness is unrealistic from an economic or space limitation standpoint, multiple discs will have to be provided or force ventilation must be considered.

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omatic.com

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Tolomatic Power Transmission Products - Tolomatic, TOL-O-MATIC - #101

Linear actuator, Electric motor, Spring applied brake, Servo-controller, Cylinder