SD Double Universal Joint

The SD Double Universal Joint, also known as a Double Cardan Joint, is a mechanical device used in the power take-off (PTO) shaft of a tractor. The PTO shaft is responsible for transferring power from the tractor’s engine to attached implements, such as a mower, baler, or tiller.

The Double Universal Joint consists of two universal joints connected in series, which allows for greater flexibility and smooth power transmission. Each universal joint consists of a cross-shaped yoke with four arms, with a bearing at each end of the arms. The bearings allow the yoke to rotate freely, enabling the PTO shaft to bend and accommodate changes in angle between the tractor and the implement.

The main purpose of the Double Universal Joint is to compensate for misalignment between the tractor and the implement. As the tractor moves over uneven terrain or changes direction, the angle between the PTO shaft and the implement may vary. The Double Universal Joint allows for these variations in angle, reducing stress on the PTO shaft and minimizing vibrations.

By using two universal joints in series, the Double Universal Joint provides even greater flexibility and reduces the amount of angular misalignment transmitted to the implement. This helps to improve overall performance, reduce wear and tear on the PTO system, and increase the lifespan of the equipment.

It’s important to note that the Double Universal Joint requires regular maintenance, including lubrication, to ensure smooth operation and prevent premature wear. Adequate lubrication helps to minimize friction and heat buildup, preserving the joint’s integrity and extending its lifespan.

In summary, the SD Double Universal Joint is a key component of the PTO shaft in a tractor. It allows for greater flexibility and compensates for misalignment between the tractor and the implement, resulting in smoother power transmission and improved efficiency.