TORQUE LIMITER

Torque Limiter Fig 1
Torque Limiter Fig 2
Torque Limiter Fig 3

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The Series 200 torque limiter is a state of the art mechanical device that will disengage at a pre-set torque value.

The trip torque is set above the normal start-up and operating torque, but below a torque setting which would normally damage the driving and / or driven equipment.

In the event of a jam, the torque limiter eliminates the threat of damage by disconnecting the inertia in the drive train.

Drive balls (A) which are seated in detents in the drive plate and the slide plate (C).

These are all held together under pressure from spring (D).

Disengagement on Overload

 

When the driven machine either jams or an overload occurs which is greater than the torque setting, the balls roll out of their seats and force apart the drive plate (B) and the slide plate (C).

The balls are retained by the cage plate (E) and roll freely on the flat surface of the drive plate (B) and slide plate (C)

 

Re-engament

 

Re-angement occurs in one of three ways depending upon which reset type is selected.

 

Type AC - Automatic Random Reset

 

The ball detents in the drive plate (B) and the slide plate (C), as well as the retaining holes in cage plate (E) are equally spaced on the same pitch circle diameter so that the balls will roll into the next detents after tripping in either direction. Immediate shutdown is required to prevent wear of the detents.

 

Type ACT- Automatic Synchronous Reset

 

They are positioned in a scattered pattern so that the balls must return to their original position before they can reset.

Re-engagement will occur within two revolutions in other direction. Immediate shutdown is required to prevent wear of the detents

 

Type AF – Free Wheeling Disengagement

 

As with the AC the detents in drive plate (B) and slide plate (C) are equally spaced. The retaining holes in the engaging plate (E) are elongated so that as the balls roll from the detents they can follow a cam profile onto a different running track away from the detents. The AF can run at higher speeds as the balls will not ratchet in the detents. Re-setting is achieved by manually locking and reversing the drive