Double Pitch sprocket Lock sprocket

Product photo
  • Sprockets with a keyless locking device.
  • Frictional force on the tapered sleeve enables sprockets to lock to the shaft with no keys.
  • Can be mounted or removed with just the bolts.

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Features

  • ＊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

Note) When selecting sprocket specifications

・It is necessary to select a sprocket specification that corresponds to the customer's operating environment and the chain specification used. For details, please refer to the compatibility table for each chain and sprocket.

If you require a material or surface treatment other than steel, please contact us as this will be made-to-order product.

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 dimensions/specs table.
  • ＊Shaft bore diameter tolerance and surface roughness
    Use a shaft diameter tolerance of h8 and a surface roughness of Ra3.2 as your standards.
  • ＊Mounting to shafts provided with keyways or notched 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 notched shaft.
  • ＊Mounting to cold finished carbon steel bars
    The allowable torque will decrease by 10% when mounting the sprocket to a cold finished carbon steel bar (drawn steel with an allowable diameter of 8 to 10 class).
  • ＊Shaft material
    Ensure that the shaft is a solid shaft using S35C grade or higher steel.
  • ＊Operating Temperature Range
    -20℃～200℃
  • ＊Bolt tightening
    Always use a torque wrench and tighten completely to a specified tightening torque when tightening bolts/nuts.
    Be sure to check the instruction manual when mounting.

Locking principle

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

Structure of S type and sleeve mounting type

Catalogs ・Instruction Manuals

Model No. examples

RF2040 S - 1 B 912T - S4 4 25 A
｜
Size 		｜
｜
｜		 ｜
No. of
strands 		｜
｜
｜		 ｜
｜
｜		 ｜
Sleeve frame No. 		｜
｜
｜		 ｜
Shaft Bore Diameter
mm		 ｜
Mounting type
A or B
Roller type Hub Type Number of teeth No. of mounting Bolts
912T：9½T
(when the number of effective teeth is 11T, this is indicated as 1100T. )

List of Models

※Click the name for more information.

Size Roller type
S R
Base Model No. Working number of teeth range Base Model No. Working number of teeth range
RF2040 RF2040S-1B□T-S○○○○● 9½
　～
　　12½		 RF2040R-1B□T-S○○○○● 10
　～
　　16
RF2050 RF2050S-1B□T-S○○○○● RF2050R-1B□T-S○○○○●
RF2060 RF2060S-1B□T-S○○○○● RF2060R-1B□T-S○○○○●
RF2080 RF2080S-1B□T-S○○○○● RF2080R-1B□T-S○○○○●
RF2100 RF2100S-1B912T-S○○○○● 9½ RF2100R-1B1100T-S○○○○● 11