Which coupling type utilizes a spider to assist in meshing and reduce wear?

The coupling type that utilizes a spider to assist in meshing and reduce wear is the jaw coupling. This type features two hubs that have jaws, and the spider serves as the connecting element between them. The spider is often made from flexible materials, which allows for some misalignment and absorbs shock loads during operation. The design helps to provide smooth power transmission while minimizing wear on the mating surfaces, as the flexible spider can accommodate slight misalignments and dampen vibrations. This characteristic is particularly important in applications where equipment may not be perfectly aligned or when subjected to variable loads, enhancing the longevity and reliability of the machinery.

In contrast, the other coupling types do not use a spider mechanism. Gear couplings consist of internal and external gear teeth that mesh together for torque transmission, typically suited for high torque applications but do not provide the same flexibility as jaw couplings. Grid couplings utilize a grid element to allow for some axial misalignment but differ significantly in design and application from jaw couplings. Sleeve couplings primarily connect two shafts in a straightforward manner without the use of a spider or flexible component. As such, the jaw coupling stands out for its effective use of a spider to reduce wear and facilitate smoother operation.