Transcript Needle Roller Bearing Design

Customer Training
Needle Bearing Product
Overview
Narrated by
David Beach
Motion Industries Retired
Timken
Learn and Lead
5/16/2007
Needle Bearing Overview.PPTA
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Needle Bearing Product Overview
Agenda
 Loose Rollers
 Cage & Roller
 Drawn Cup
 Solid Race
 Thrust Products
 Summary
5/16/2007
Study of Roller
Bearings
Begins Here
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Customer Training
Needle Bearing Design
Overview
Loose Rollers
Timken
Learn and Lead
5/16/2007
Needle Bearing Overview.PPT
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Needle Bearing Product Overview
Loose Needle Rollers
 52100 bearing grade steel
 Hardened and precision ground
 Standard hardness RC 60-64 (or equivalent)
 Multiple uses as bearing elements, precision shafts or pins
 Diameter:
0.060 – 0.500” (1.52 – 12.7 mm)
 Length:
0.100 – 2.000” (2.5 – 50.8 mm)
 Length to diameter: 4:1 – 10:1
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Needle Bearing Product Overview
Full Complement Clearance
Radial (RIC) & Circumferential (cc)
 Successful operation of a
full complement of rollers
not only requires careful
selection of radial internal
clearance (RIC) but,
more importantly,
depends on proper
circumferential clearance
(or the total clearance
between rollers)
Radial
Clearance
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Circumferential
Clearance
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Needle Bearing Product Overview
Loose Needle Rollers
 Benefits of loose rollers
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Reduced component cost
Reduced cross section
Weight savings
Load-carrying capability
Added design flexibility
 Customer requirements
– Assembly techniques
– Loose roller feeding capabilities
– Precision manufacturing & heat treat of raceway surfaces
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Customer Training
Needle Bearing Design
Overview
Cage & Roller Assemblies
Timken
Learn and Lead
5/16/2007
Needle Bearing Overview.PPT
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Needle Bearing Product Overview
Cage & Roller Assemblies
Steel
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Polymer
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Needle Bearing Product Overview
Cage Functions
 Retain Rollers
– Makes for a unitized bearing assembly
– Easier handling
– Easier customer assembly
– Easier customer serviceability
 Guides Rollers
– Outside load zone
 Engineered for application
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Needle Bearing Product Overview
Cage Functions
 Separate Rollers
– Reduces heat and wear at high operating speeds
by cutting the relative surface speed in half
– Allows for increased lube flow through the bearing
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Without
Cage
Needle Bearing Overview.PPT
With
Cage
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Needle Bearing Product Overview
Cage and Roller - Advantages
 Over a Full Complement
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Easier to handle
Less friction
Higher speed
More debris tolerant
More misalignment tolerant
Holds more grease
 Over other Bearings
– Smaller cross section
– Easier installation & replacement
– Lighter weight
 Size Range
– 0.2 – 8 inch (5 – 200 mm) bore (Conversion: One Inch = 25.4mm)
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Customer Training
Needle Bearings Overview
Drawn Cup
Timken
Learn and Lead
5/16/2007
Needle Bearing Overview.PPT
12
Needle Bearing Product Overview
Introduction
 Types of inch series drawn cup needle roller
bearings
B Bearing
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J Bearing
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Needle Bearing Product Overview
Drawn Cup - Closed End
 M-type
 Available as either full complement or caged
 Allows for a through bored housing
 Good contamination resistance
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Needle Bearing Product Overview
Design Features - Seals
 Drawn Cup bearings can utilize a seal on one
or both ends
 Sealed bearings can be pre-greased (greased
for life) if the application warrants it
SEALED
ONE SIDE
SEALED
TWO SIDES
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Needle Bearing Product Overview
Drawn Cup Roller Clutches,
Roller Clutch & Bearing Assemblies
 Transmits torque in one direction
 Free overrun in opposite
direction
 Torque applied thru shaft or
housing
 Available as:
–Clutch-only
–Clutch bearing assembly
 Rollers wedge against internal
ramps to transmit torque
 Operates on hardened shaft
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Size Range
Inch: 1/8 in. - 1 in. bore
Metric: 4mm - 30mm bore
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Needle Bearing Product Overview
Drawn Cup Advantages
 Thin cross section
 Cost effective
– Existing production parts
– New parts
 Ease of assembly – no retention feature needed
 Bearing quality housing not necessary
– Housings can be cast iron, aluminum, plastic
 Special features
– Seals
– Closed end
– Oil holes for lubrication and debris
 Wide size range – drawn cups
– .125 – 5.5 inch (3 - 140mm) bore
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Customer Training
Needle Bearing Product
Overview Part A
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Timken
Learn and Lead
5/16/2007
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