Hydraulic / Pneumatic Brake and Clutch Actuation

Hydraulically Actuated Clutches and Brakes
Type Pressure Present Pressure Absent
Hydraulically Engaged Engaged Disengaged
Spring Engaged Disengaged Engaged

Pneumatic / Hydraulically Engaged Clutches and Brakes

Pneumatic brakes and clutches, also referred to as air or hydraulic brakes and clutches, require that air or hydraulic pressure be supplied to an internal piston for engagement. As long as the pressure is supplied, the unit is engaged. When the pressure is removed the clutch or brake is disengaged.

Air or hydraulic fluid forces a piston against a pressure plate that squeezes a set of friction discs together allowing the clutch or brake to transmit or hold torque. An in-depth description of the actuation of our pneumatic/hydraulic clutches and brakes is available on our actuation comparison page.

Pneumatic / Hydraulically Released (Spring Engaged) Clutches and Brakes

Pneumatic or hydraulically released clutches or brakes are engaged whenever air or hydraulic pressure is absent. While the air or hydraulic pressure is off, the unit will remain on. Internal springs are used to push on a pressure plate. The pressure plate then squeezes a set of friction discs together allowing the clutch or brake to transmit or hold torque.

The unit is disengaged when air or hydraulic pressure is supplied to the piston. The piston forces a pressure plate against the springs thereby removing the spring force from the friction discs. The discs are now allowed to spin freely without the ability to transmit or hold torque. An in-depth description of the actuation of our pneumatic or hydraulic clutches and brakes is available on our actuation comparison page.

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Overview

Advantages of Hydraulic / Pneumatic Brakes & Clutches

  • More consistent engagement / disengagement than electric devices
  • Quicker response times than equivalents
  • No electric coil, greater heat dissipation
  • Self-adjusting for wear compensation

Advantages of Spring Applied, Hydraulic / Pneumatic Released Brakes & Clutches

  • Automatic engagement upon loss of air or hydraulic pressure
  • More consistent engagement / disengagement than electric devices
  • Quicker response time than equivalents
  • Greater heat dissipation due to elimination of the electric coil

CJM PNEUMATIC CLUTCH & BRAKE PRODUCTS



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