Needle Bearing Product Overview

Timken Learn and Lead

Customer Training

5/16/2007 Needle Bearing Overview.PPTA 1

Needle Bearing ProductNeedle Bearing ProductOverviewOverview

Narrated by

David BeachMotion Industries Retired

Needle Bearing Product Overview

Agenda

Loose Rollers Cage & Roller Drawn Cup Solid Race Thrust Products Summary

5/16/2007 2

Study of Roller Bearings

Begins Here


Customer Training

5/16/2007 Needle Bearing Overview.PPT 3

Needle Bearing DesignNeedle Bearing DesignOverviewOverview

Loose Rollers



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



Full Complement ClearanceRadial (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 Circumferential

Clearance



Loose Needle Rollers

Benefits of loose rollers– 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


Customer Training


Needle Bearing Design Needle Bearing Design OverviewOverview

Cage & Roller Assemblies



Cage & Roller Assemblies

PolymerSteel



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



Without Cage

With Cage

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



Cage and Roller - Advantages Over a Full Complement

– 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)


Customer Training


Needle Bearings OverviewNeedle Bearings Overview

Drawn Cup



Introduction

Types of inch series drawn cup needle roller bearings

J BearingB Bearing



Drawn Cup - Closed End

M-type Available as either full complement or caged Allows for a through bored housing Good contamination resistance



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

SEALEDONE SIDE

SEALEDTWO SIDES



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

Size Range

Inch: 1/8 in. - 1 in. bore

Metric: 4mm - 30mm bore



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


Customer Training


Needle Bearing ProductNeedle Bearing ProductOverview Part AOverview Part A

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Needle Bearing Product Overview