Question

A 2.5 teeth/in diametral pitch 17‐tooth pinion and 50 tooth gear are paired. The gears are cut on the 20 degrees ̊full‐depth involute system. Find the contact ratio.

Answer #1

For standard gear addendum is equal to one module.

Contact ratio = (Arc of contact)/ ( circular pitch)

Two standard gears have 18 and 32 teeth, respectively. The
diametral pitch is 10, and the pinion rotates at 1000 rpm.
Determine the following:
(a) center distance,
(b) pitch diameters,
(c) circular pitch,
(d) pitch line velocity,
(e) angular velocity of the gear.

You are given a 10 teeth gear, a 20 teeth gear, a 30 tooth gear,
a 40 tooth gear, a 50 tooth gear, and a bunch of axles
(shafts). (3 points)
Draw below how will you connect the gears and shafts so that output
shaft has the highest gear ratio.
(Hint: Think compound gear trains)

A system that drives a centrifugal pump with an electric motor
transmits a 2,800 lb tangential load between a pinion and its gear.
The pinion and gear made with standard 25o , full-depth teeth are
hobbed from an AISI 4140 nitrided steel. They are manufactured to a
quality level of 9, and a reliability of 0.9 is required. The
diametral pitch is 6, and the face width is 2.000 in. The 21 tooth
pinion rotates at 1,800 rpm, and it...

Hello! I am from Kinematics and Dynamics where we are learning
about Spur Gears. Unfortunately, I am lost on how to solve this
problem. Please show and explain each step legibly on how to solve
it. Thanks!
3. The center distance of two 24-tooth, 20-degree pressure
angle, full-depth involute spur gears with diametral pitch of 10
teeth/in is increased by 0.05 in over the standard distance. At
what pressure angle do the gears operate?

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