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. Phasing is also easy.
  • *S Type :Strong locking with bolts, and a wide variety of shaft diameters available
  • *N Type :Easy locking with nuts and compatible with small diameter shafts.

Features

  • S Type (Available chain sizes :RS35~RS100)
  • *There is no backlash after mounting (locking). Phase alignment is also easy.
  • *Can be mounted or removed with just the bolts.
  • *Sprocket is locked in the thrust direction, making sprocket retainers unnecessary.
  • N Type (Available chain sizes :RS35~RS60)
    In addition to the features of the S type sprockets, N type sprockets also possess the following features.
  • *Compared to S types which require you to fasten several bolts, N types can be locked to the shaft by just fastening nuts. This makes removing and reattachment for minor adjustments easy.
  • *Tsubaki offers lock sprockets with a minimum bore diameter of 7mm to a max of 28mm standard to satisfy any requirement.
  • *Designed for strength with the chain's maximum allowable load in mind -- a compact design with minimal waste.

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

Sleeve mounting type (S type)

Locking principle

Sleeve mounting type (N type)

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

Points of caution regarding sleeve mounting types

  • ・RS35-1B19TQ-S33_ _ _
  • ・RS40-1B15TQ-S33_ _ _

*The above models can use configuration A only, as configuration B will cause interference with the chain.

Appearance of N type and sleeve mounting type

Appearance of N type and sleeve mounting type

Catalogs ・Instruction Manuals

Model No. examples

Lock sprocket S Type

RS40 - 1 B 21T Q - S4 8 25 A

Size

No. of strands



Number of teeth



Sleeve frame No.



Shaft Bore Diameter
mm

Mounting type
A or B
Hub Type Tooth hardening
None :Teeth not hardened
Q:hardened teeth specifications
No. of mounting Bolts

Lock sprocket N Type

RS40 - 1 B 21T Q - N4 18 A

Size

No. of strands



Number of teeth



Sleeve frame No.

Shaft Bore Diameter
mm

Mounting type
A or B
Hub Type Tooth hardening
None :Teeth not hardened
Q:hardened teeth specifications

List of Models

※Click the name for more information.

Size Type
S Type N Type
Base Model No. Tooth no. range Base Model No. Tooth no. range
RS35 RS35-1B□TQ-S○○○○● 15T
 ~
  40T
RS35-1B□TQ-N○○○● 12T
 ~
  40T
RS40 RS40-1B□TQ-S○○○○● 14T
 ~
  56T
RS40-1B□TQ-N○○○● 11T
 ~
  40T
RS50 RS50-1B□T■-S○○○○● 14T
 ~
  40T
RS50-1B□TQ-N○○○● 11T
 ~
  25T
RS60 RS60-1B□T■-S○○○○● 12T
 ~
  40T
RS60-1B□TQ-N○○○● 9T
 ~
  25T
RS80 RS80-1B□T■-S○○○○● 12T
 ~
  35T
---
RS100 RS100-1B□T■-S○○○○● 13T
 ~
  21T
---