Angular Contact Ball Bearings for Machining Tools
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Angular Contact Ball Bearings for Machining Tools JTEKT CORPORATION CAT.NO. B2006E

Angular Contact Ball Bearings for Machining Tools Machining tools regularly improve in speed and efficiency in response to industrial demands for increased productivity and product machining efficiency. Consequently, bearings for machining tools are required to achieve the following performance levels. • Ultrafast rotation to reduce machining time • Rapid acceleration/deceleration capability for improved efficiency • High rigidity with low increase in temperature for high precision machining Moreover, environmental concerns are now a major issue, bringing into question the oil-and-air...

n 20 to 30% reduction in temperature increase (compared with Koyo's conventional products) Koyo has conducted various tests and analyses and de- veloped elaborate machining techniques to improve the performance of bearings used with machining tool spin- dles. The result is a substantial reduction in frictional heat generated in bearings rotating at a high speed. ra 1.2- to 1.5-fold increases in speed limits (compared with Koyo's conventional products) Speed limits have been extended through re-designing for high-speed rotation and heat reduction. Use of cer- amic balls as rolling elements...

migh Ability Angular Contact Ball Bearings for Machining Tools There are four types of High Ability bearings. • Standard High Ability bearing -Outer ring -Inner ring This bearing has the same dimensions as conven- tional products. The limiting speed has been im- proved by raceways machined to optimal geometry for high-speed rotation. Balls are available in steel High Ability bearing with high load rating Outer ring Inner ring An increased load rating has been achieved by in- creasing the size of the ball. The ball is ceramics to ensure high-speed performance. • Oil-and-air lubrication...

3. Types and Bearing Numbers (1) High Ability bearing types and principal applications Bearing dimension Contact angle rolling element high-rigidity type high load-rating type Ultrafast, low-noise oil-and-air lubrication Extremely ultrafast oil-and-air lubrication (2) Bearing number nomenclature Internal clearance 5 : Denotes a medium value of CY : preload (negative clearance) Combination symbol Typical examples of combination symbol -Cage guide -5 : ball guided No symbol : outer ring guided Bore diameter number, 13: Denotes a bearing bore diameter of 5 mmx13=65mm. Dimension series, 9:...

Angular Contact Ball Bearings for Machining Tools The temperature of an operating bearing increases due to frictional heat produced within the bearing. This increase in temperature imposes a certain speed limit when the bearing is required to rotate at high The reason being that the bearing operation discon- tinues due to seizure caused by temperature increa- ses above a certain temperature. Consequently, in- creases in bearing temperature during operation can serve as a measure in regard to speed limit. High Ability bearings exhibit their maximum perfor- mance when used in pairs or when...

(2) High-speed performance of Type D High Ability Type D bearings are designed for oil-and-air lubrication. Their inner rings have an oiling groove to ensure lubrication on the rolling contact surface for improved lubrication reliability. Outer ringv Oiling port- Inner ring.. Inner ring The oiling nozzle should be aligned with the oiling groove in the inner ring. Fig. 3 Lubrication Method for Type D Fig.4 compares the high-speed performance of Rotational speed Bearing Temp, of Types R and D Furthermore, Type D bearings generate only a slight noise during rotation and are therefore also...

Oligli Ability BALL BEARING SERIES Dimension table Steel balls

rTligh Ability BALL BEARING SERIES

ffligh Ability BALL BEARING SERIES

ÍTiigh Ability BALL BEARING SERIES

niigh Ability BALL BEARING SERIES Dimension table Ceramic balls

ÍTiigh Ability BALL BEARING SERIES

fJligh Ability BALL BEARING SERIES

nHgh Ability BALL BEARING SERIES

(High Ability BALL BEARING SERIES

/High Ability BALL BEARING SERIES Dimension table Ceramic balls These bearings are useful only with oil and air lubrication. Please use with lubricating spacers as shown below. For spacer dimensions and nozzle locations, consult JTEKT. supply discharge Lubricating spaceres

rrSgh Ability BALL BEARING SERIES Dimension table Ceramic balls These bearings are useful only with oil and air lubrication. Please use with lubricating spacers as shown below. For spacer dimensions and nozzle locations, consult JTEKT. supply supply discharge supply supply supply supply

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High Ability Angular Contact Ball Bearings for Machining Tools Value & Technology PRINTED WITH This catalog has been printed on paper of 100% waste paper pulp using environmentally friendly soy ink. JTEKT CORPORATION