chapter 6 design of keys, splines and pins
DESCRIPTION
Chapter 6 Design of Keys, Splines and Pins. Key terms: Keys Splines Keyway, keyseat Hub Crush Pin. 6.1 Key Joints. 1. Basic Concept A key is a fastening inserted into the keyway of two mating parts, it is used to transmit torque from a shaft to - PowerPoint PPT PresentationTRANSCRIPT
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Chapter 6 Design of Keys, Splines and Pins
Key terms:• Keys • Splines • Keyway, keyseat • Hub • Crush • Pin
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6.1 Key Joints
• 1. Basic Concept A key is a fastening inserted into the keyway of two mating parts, it is used to transmit torque from a shaft to a hub or vice versa.
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2. Types of Keys
• Straight keys
• Woodruff keys
• Taper keys
• Splines
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3. Straight Key Joints
• 1) Principles clearance
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2) Types
a. Plain flat keys 普通平键 (fixed joints)
A Key with rounded ends
B Key with square ends
C Key with one square and one rounded end
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b. guided keys (sliding joints)
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c. feather key joints (sliding joints)
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4.Woodruff Key Joints
Greater depth of the key seat in the shaft.
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5. Taper Key Joints
Gib-head taper key
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Tangent Double-taper Key Joints
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6. Strength Calculation of Straight Key Joints
1)Failure Modes: crush, wear, snip
T——torque
d——diameter of shaft
h——thickness of the key
l——working length of the key
[p]——allowable crush stress
2)Crushed Strength Condition
][dhl
T4p
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3) Steps for Selecting Straight Keys
• a. According to the diameter of shaft, get section size
b h;
• b. Select proper key length L in key length series;
• c. Check the Strength Calculation (if necessary);
h
L b
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4) Double-Keys Arrangement
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6.2 Splines Joints • Splines can be dealt as multiple keys w
hich are integral with the shaft.Splines are classified as: Parallel-sided splinesInvolute splines
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Advantages: 1) Greater carrying capacity; 2) Greater fatigue strength of a spline shaft; 3) More accurately centered and guided.
Disadvantages:
Requirements for special equipments and tools, which increase the manufacturing costs.
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6.3 Pin Joints
Cylindrical pin Taper pin Pin for joining
safety pin
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Key Standards
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The endThanks!