Shear Bolt Torque Limiter for PTO Shaft

Shear Bolt Torque Limiter for PTO Shaft

Shear bolt torque limiters type SB is devices able to interrupt power transmission when the torque transmitted exceeds the setting. This interruption in power is caused by the shearing of a bolt. This bolt must be replaced before power can be restored. The use of shear bolt torque limiters is recommended to avoid damage to drivelines mounted on implements subject to accidental overloads or torque peaks.

Note: For the safety of the operator and the reliable function of the driveline, replace the bolt only with one equal in length, diameter, and grade to the original.

The torque setting for shear bolt torque limiters is usually two or three times the median torque M and must never exceed the maximum torque of the driveline (Max). Standard settings for each size of SFT driveline are in the table to the right. SB torque limiters size S1 to S4 have a pushpin attachment to the splined shaft. Larger sizes use a taper-pin attachment.

Shear Bolt Torque Limiter Specification

Shear Bolt Torque Limiter Parameter

Shear Bolt Torque Limiter Parts

1. Yoke
2. Grease nipple
3. Steel ball
4. Hub
5. Pushpin
6. Shear bolt&Nut

How Do Shear Pin Torque Limiters Work?

Shear pin torque limiters are a simple, cost-effective design for protecting equipment from torque overloads. When torque is being transmitted from the driving to the driven load, the pin experiences a shear force. If the transmitted torque causes a force that exceeds the pin’s shear strength, the pin breaks and the driving and driven loads are immediately de-coupled. This immediate de-coupling of the load makes the shear pin design a type of “disconnect” torque limiter.

It limits the torque thanks to the shearing of a bolt, which must be replaced to reset the transmission of power. The intervention torque depends on the distance of the bolt from the axis of transmission, its diameter and class of resistance.

When the torque exceeds that supported by the bolt, the latter shears and the power transmitted is annulled. To restore the transmission, the sheared bolt must be replaced with one having the same characteristics (diameter, class of resistance, threaded portion and length) as the original bolt. Special design on request. Works in both directions of rotation.

PTO Slip Clutch VS PTO Shear Bolt

Replacing sheared bolts requires stopping work, getting off the tractor, and swapping bolts out. You need to keep a good supply of shear bolts to hand when using your machinery. Whereas the PTO slip clutch allows for the drive to be stopped when needed and resume the torque when free of any obstructions.

Other PTO Shaft Accessories

Shear Bolt Torque Limiter Manufacturers

HZPT covers an area of more than 12000 square meters and employs more than 100 people. We specialize in developing, manufacturing, and selling PTO shafts, industrial universal shafts, automobile drive shafts, universal joint coupling shafts, universal joints, etc. The annual turnover is 60 million yuan and 9 million US dollars, increasing year by year. Our products enjoy a high reputation among customers in Europe, the United States, Asia, Australia, and North America. We are the top three professional OEM suppliers of many agricultural tool factories in the domestic market. HZPT transmission shaft adheres to our “QDP” principle: quality first, rapid delivery, and competitive price. We have obtained CE, TS / 16949, and ISO9001 certification, and have systematic production equipment and a QC team to ensure our quality and delivery. We warmly welcome friends from all walks of life to visit and establish mutually beneficial long-term cooperative relations.

PTO Shafts & Agricultural Gearboxes are Available.

A PTO shaft is a highly sophisticated mechanism that allows implements to draw energy from an engine. It works with a mechanical agricultural gearbox. A PTO shaft can be mounted on a vehicle's transmission, and is an essential part of the system. A high-quality PTO shaft should be durable enough to withstand torsion and minimize vibration.

The agricultural PTO gearbox is designed to change the output speed of a PTO drive shaft. It can be used as a decreasing or increasing ratio gearbox. With the decreased ratio gearbox, it reduces the PTO shaft's speed from 1000 rpm to 540 rpm, allowing you to use equipment designed for 540 rpm. On the other hand, an increasing ratio gearbox increases the speed of the PTO shaft from 540 rpm to 1000 rpm.

HZPT manufactures a wide range of durable PTO shafts and agricultural gearboxes to meet all your requirements.