Tsubaki Products

Double Pitch sprocket 　Fit bore BR Type

Fit bore BR type is a sprocket with finished bore for mounting bearings.
No additional troublesome finishing is required when installing bearings.
(Bearings not included )
Can be used as driven side sprockets or idler sprockets for conveyors and other transport chains.
Size 　steel (S-roller )：RF2040～RF2160
　　　　steel (R-roller )：RF2040～RF2100

Catalogs ・Instruction Manuals

Leaflet

Features

・A line-up of deep groove ball bearings to choose from, the most typical of all rolling bearings.
・Bore finishing required to mount the bearing can be indicated by the model number.
・Eliminates the hassle of creating drawings and arranging for additional finishing.
・Housing bore is precision-finished and the bearings can be inserted and used after the product arrives.
　＊Bearings not included

Usage examples

Driven side sprocket

＊If the driven side sprockets are used with a key locking in equipment with two or more chains, the phase of sprocket teeth and keyway must be machined with precision, otherwise variations in the amount of wear of several sprockets on the same shaft may occur.
　Using sprockets with bearings eliminates the need for keyway machining, allows use without concern for phase and installation easier.
＊Equipment can be made compact because there is no need to use an insert bearing unit.

Idler Sprocket

＊Idler sprockets are transmission components that rotate with the power of chain.
　Adjusts chain sag, transmits stable rotation and maintains normal chain transmission.
　Excessive chain sag can cause vibration/noise and prevent the chain from properly engaging the sprocket, which prevents the chain from operating smoothly.

Takes up slack on long center distances.

Functions as a center idler on drives with multiple shafts.

When chain wrap angle is insufficient

Precautions when selecting sprockets

Please confirm the following points before considering Fit bore BR Type.

Bearing life calculation is performed under the following conditions, so please refer to them.

It is assumed that bearings are used on the driven side sprockets in horizontal conveyor layouts.

・Conveying speed ：
　S-roller ：20m/min
　R-roller ：30m/min
・Load ：
　Conveyor chain with attachment 　1/2 of maximum allowable load
・Bearing used ：
　Deep groove ball bearing
＊Calculated based on the basic rating life (L10) specified in JIS B 1518.
　The basic dynamic load rating is based on the values of domestic bearing manufacturers, and is calculated assuming that no axial load is applied.

C：Basic dynamic load rating [N]

P：Dynamic equivalent load [N]

n：Speed [r/min]

Horizontal conveyance image

Fix the driven shaft to the equipment side.

＊The safety factor in relation to the basic static load rating is given in the list of main dimensions.

When Using Lock Series RS Sprockets

Installation

＊Housing bore tolerance is H7 finish.

　For the design of shaft side, a JIS-compliant design is recommended.

　【Reference 】From JIS B 1566 "Shaft tolerance class commonly used for radial bearings"

　　　　　Shaft diameter Φ10～Φ17：js5　Shaft diameter Φ20～Φ70：k5

　The strength of the shaft varies depending on the application, so please determine it according to the general mechanical design.

＊Fix the bearing firmly to prevent it from moving.

　Mounting examples include fixing using collars, end plates and retaining rings.

＊If both the inner and outer rings of the bearing have a loose fit, clamp the bearing as shown in the "Collar + end plate" diagram.

Collar

Collar +End Plate

Retaining ring

Operating temperature

＊Operating temperature of sprocket is -10 to 150°C.

　Check with the bearing manufacturer regarding the operating temperature range of the bearing.

Lubrication

＊Be sure to lubricate sprockets.

＊For lubrication at high temperatures, see the separate catalog "DRIVE CHAINS & SPROCKETS" or "SMALL SIZE CONVEYOR CHAINS & SPROCKETS".

＊Lubricate the bearings to maintain their life.

　Poor lubrication due to grease deterioration will significantly reduce service life.

Model No. examples

Double Pitch sprocket

RF2060S-1B1012T

BR001

06007

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Main Body Code

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(1)shape

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(3)"0"+Bearing
nominal number