Posi-Lock PSL-K (Standard Specification)

Specifications

How to choose Friction joint

Points to check when selecting, with the values for this product (Posi-Lock PSL-K (Standard Specification)).

1. 1. Match the Shaft Diameter and Boss Bore Diameter

   The applicable shaft diameter d is the outer diameter of the shaft to be installed, and the outer diameter D is the dimension that fits into the boss bore. Friction fastening depends on controlling the fit clearance, so also confirm that the shaft and boss bore can be machined to the manufacturer's specified tolerances and surface roughness.

2. 2. Allow a Margin in Allowable Transmission Torque

   If the allowable transmission torque T is exceeded, the fastening surfaces slip, causing misalignment and wear. Select based not only on the motor's rated torque but also on the peak torque during startup or impact loads multiplied by a service factor.

3. 3. Check Simultaneous Action with Thrust Force

   For applications with axial loads, check the allowable thrust force. When torque and thrust force act simultaneously, they share the friction force, so each allowable value may not be usable independently; confirm the manufacturer's handling of combined loads.

4. 4. Examine Boss Strength from Side Pressure on the Boss

   During fastening, surface pressure acts on the inner surface of the boss, which pushes it outward. Calculate the required boss outer diameter and wall thickness from the boss side pressure and the yield point of the boss material, and for thin-walled bosses or low-strength materials such as aluminum, check for breakage or deformation. Examine the shaft side in the same way using the shaft side pressure.

5. 5. Review the Relationship Between Overall Length and Boss Width

   The overall length L is the axial fastening length. If the boss width is shorter than this, the fastening surface is insufficient and the performance will not be achieved. Together with the installation space, confirm that the boss width satisfies the overall length and that working space for bolt heads and tools is secured.

6. 6. Tighten Evenly to the Specified Tightening Torque

   Because transmission performance depends on the clamping force of the clamping bolts, control the tightening torque (1 to 142 N·m for the listed products) with a torque wrench, and tighten evenly in several passes following a diagonal sequence. Also confirm in advance the required tool size and how to use the removal screw holes.

This guide was written by AI based on the listed products' documents and specification items.

About Friction joint and all products

Description

Composed of three components: outer sleeve, inner sleeve, and clamping bolts. Fastening is achieved by tightening the clamping bolts evenly to the specified tightening torque. Slippage at the fastened section or exceeding the specified transmission torque may cause damage, so caution is required.

FAQ

Q. What are the body material and clamping bolt material of the Posi-Lock PSL-K (Standard Specification)?

A. The body material is equivalent to S45C quenched and tempered, and the clamping bolt material is SCM435 with black oxide treatment.

Q. What is the nominal bolt diameter and tightening torque range for fastening the Posi-Lock PSL-K (Standard Specification)?

A. The nominal bolt diameter is M4 to M5, and the bolt tightening torque is 2 to 8 N·m.

Q. What applications is the Posi-Lock PSL-K (Standard Specification) suited for, and can it be reused?

A. It is used for fastening shafts and hubs and for power transmission sections requiring positioning. It enables high transmission torque and easy, accurate positioning, and is reusable.

Q. How should the Posi-Lock PSL-K (Standard Specification) be removed?

A. It can be easily removed using the removal screw holes (2-M4 to 2-M5).

Q. What should be noted when fastening the Posi-Lock PSL-K (Standard Specification)?

A. Slippage at the fastened section or exceeding the specified transmission torque may cause damage, so caution is required. Tighten the clamping bolts evenly to the specified tightening torque.

Written by AI based on the content of the source documents.

Source documents

• Manual ポジロック PSL-K 取扱説明書 8 pages Open page 2
  Found on: https://www.mikipulley.co.jp/friction-locking-devices/mechanical/