Downhole rotary motor with sealed thrust bearing assembly

A rotary device, such as a downhole motor, with a rotary wave seal assembly. The seal assembly is formed by a sinuous or non-linear circumferential gland or groove and an annular seal member, such as an O-ring, supported in the groove. The device further includes at least one thrust bearing assembly for transmitting axial pressure from the bearing housing to the drive shaft. Each thrust bearing comprises a self-lubricating thrust washer as the bearing element. Still further, where the rotary device comprises two coaxial tubular structures that are not to rotate relative to each other, an anti-rotation means is provided. The anti-rotation means includes a cylindrical pin received in mating longitudinal, radiused grooves in the outer wall of the innermost elongate member and the inner wall of the outermost tubular member. The anti-rotation means includes a cylindrical pin received in the mating longitudinal grooves. This configuration allows axial, sliding movement of one tubular member relative to the other, but prevents rotational movement therebetween. Where the rotary device is a downhole motor, it further comprises a radial bearing sleeve positioned between the coaxial downhole ends of the universal housing and the connecting rod, above the bearing section of the motor. This sleeve acts as a barrier to prevent debris in the drilling fluid from moving into the bearing assemblies.