REFRIGERATION+AIR COND.TECH.-W/2 ACCESS
8th Edition
ISBN: 9781337370042
Author: TOMCZYK
Publisher: CENGAGE L
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Textbook Question
Chapter 49, Problem 3RQ
True or False: All reciprocating compressors start up fully loaded.
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4.
G
A micarta pinion rotating at 1200 r.p.m. is to transmit 1 kW to a cast iron gear at a speed of 192 r.p.m.
Assuming a starting overload of 20% and using 20° full depth involute teeth, determine the module,
number of teeth on the pinion and gear and face width. Take allowable static strength for micarta as 40
MPa and for cast iron as 53 MPa. Check the pair in wear.
I want to solve these choices
2. A spur gear made of bronze drives a mid steel pinion with angular velocity ratio of 32: 1. The
pressure angle is 14½. It transmits 5 kW at 1800 r.p.m. of pinion. Considering only strength, design
the smallest diameter gears and find also necessary face width. The number of teeth should not be less
than 15 teeth on either gear. The elastic strength of bronze may be taken as 84 MPa and of steel as 105
MPa. Lewis factor for 14½½ pressure angle may be taken
0.684
0.124
y =
No. of teeth
as
[Ans. m 3 mm; b= 35 mm; Dp = 48 mm; D= 168 mm]
Chapter 49 Solutions
REFRIGERATION+AIR COND.TECH.-W/2 ACCESS
Ch. 49 - How does the compressor lubrication system differ...Ch. 49 - True or False: Most reciprocating compressors have...Ch. 49 - True or False: All reciprocating compressors start...Ch. 49 - Describe how a centrifugal compressor starts up at...Ch. 49 - Describe how a centrifugal compressor starts up at...Ch. 49 - When condenser tubes become fouled, they may be...Ch. 49 - Describe what happens when an absorption chiller...
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