TSUBAKI Double Pitch Chain Sprockets
Lock Series

Sprockets with a keyless locking device.

Frictional force on the tapered sleeve locks sprockets to the shaft with no keys. Can be mounted or removed with just the bolts.

Feature

• There is no backlash after mounting (locking).
• Phase alignment is also easy.
• Sprocket is locked in the thrust direction, making sprocket retainers unnecessary.
• Available chain sizes: S roller: RF2040 – RF2100, R roller: RF2040 – RF2100

When Using Lock Series RS Sprockets

Please confirm the following points before considering Lock Series sprockets.

Allowable transmission torque
Ensure that the load torque does not exceed the specified transmission torque in the dimension/specs table.
Shaft diameter tolerance and surface roughness
Use a shaft diameter tolerance of H8 and a surface roughness of 12S as your standards.
Mounting to shafts provided with keyways or D-shaped shafts
The allowable transmission torque will decrease by 10% when mounting the sprocket to a shaft provided with a finished keyway, such as a motor shaft, or to a D-shaped shaft.
Mounting to cold finished carbon steel bars
The allowable transmission torque will decrease by 10% when mounting the sprocket to a cold finished carbon steel bar (drawn steel with an allowable diameter of 8 – 10 class).
Shaft material
Ensure that the shaft is a solid shaft using S35C grade or higher steel.
Operating temperature range
-20ºC to 200ºC
Bolt tightening
Always use a torque wrench when tightening bolts and tighten completely to the torque standards.

Locking principle

The inner diameter of the sprocket and the outer diameter of the lock sleeve are tapered. When locking bolts (nuts) are tightened, sprockets will slide and move up on the tapered surface.

A wedge action will generate force P and P’ in the radial direction to press on the shaft and tapered inner side, and frictional force will tightly lock the sprocket and shaft.

Structure of S type and sleeve mounting type

Reference Number System

(1) Chain number: S or R roller
(2) Other sizes and hub types: 1 = Single strand, B = B type
(3) Working no. of teeth: 912T = 9 and 1/2T (when working number of teeth is 10T, this is indicated as 1000T)
(4) Lock series type: S = S type
(5) Bore diameter
(6) Mounting configuration: A or B

Dimensions/Specifications