Tsubaki: The solution for shaft locking devices
EL Series BASIC CHARACTERISTICS
1. Transmissible Torque, Transmissible Thrust and Contact Pressure Mt: Transmissible Torque
2. Contact Pressure and Transmissible Torque for Multiple POWER-LOCK Installation
Pax: Transmissible Load P 、 P': Contact Pressure Fo: Preload Force Fe: Actual Locking Force F: Total Force
In the case of multiple EL POWER-LOCK installation the pressure applied on the rings will distribute as illustrated above. The following table indicates transmissible torque ratios for specific numbers of unit(s) installed.
The EL Series POWER-LOCKs require preload force Fo to obtain a 0 clearance shaft-hub connection. The degree of tightness achieved by applying the actual locking force Fe in addition to the preload force Fo, is directly proportional to the Fe as indicated in the above diagram. Accordingly, we use the following formula to calculate the total force required to reach the desired degree of tightness. F=Fe+Fo2. Transmissible torque and contact pressure are generally determined by the following formulas. Mt = N × μ × d 2 ( μ : Friction Coefficient) (1) Pax = N × μ = 2Mt/d (2) P = N/ π d < (3) P ' = N/ π D < (4) N = (β : EL Power-Lock taper angle) (5) Fe tanβ＋2
A maximum of four EL POWER-LOCKs may be installed.
Corner R Values If you are not using a spacer sleeve, maintain the following Corner R values.
Note: Mt 1 , P 1 ,P 1 ' refer to single unit installation
Spacer Sleeves Use a spacer sleeve (as illustrated below) if indentations or large Corner R values cannot be avoided due to specific machining requirements.
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