A spring articulation structure particularly for play, fitness training and sports instruments, said structure comprising a core element (1) supported in between two rubber rings (2) and provided with a shaft element (5) fitted in said core element; a shell compactly surrounding the core element and the rubber rings and attached to a bottom plate (9), the top part (3') of said shell being in the middle provided with a aperture (8) with a downwardly narrowing conical surface (7) for the shaft element (5); and a cylindrical element (4) resting on top of the top part (3') of the shell and surrounding the shaft element (5).

A fluid-filled elastic cylindrical mount including (a) a core portion including a center shaft member, an intermediate sleeve disposed radially outwardly of the center shaft member, and an elastic body interposed between and connecting the center shaft member and the intermediate sleeve, (b) and an outer sleeve portion having a cylindrical bore in which the core portion is fixedly received, whereby pockets formed in the core portion are closed by the outer sleeve portion to provide fluid chambers, the outer sleeve portion consisting of a plurality of sections having respective part-cylindrical inner surfaces cooperating to define the cylindrical bore, and respective pairs of axially extending abutting surfaces which are contiguous to the part-cylindrical surfaces and at which the sections are butted together, and wherein a sealing member is squeezed by and between the abutting surfaces, and the sections have respective fixing portions which are spaced apart from the sealing member and at which the sections are fixed to each other.

A flywheel-type power storage device comprises a coreless synchronous and outer rotor-type motor and a flywheel. The motor comprises a stator provided with a stator winding having a cylindrical portion, and a rotor having inner and outer field members constituting therebetween a field gap in which the cylindrical portion is positioned. At least one of the inner and outer field members comprises a permanent magnet. A bearing is provided between the stator and the rotor so as to rotatably support the rotor against said stator. The stator is separated into a bearing portion constituting the bearing and a stator body provided with the stator winding. The bearing portion is supported via an elastic member by the stator body. The flywheel is fixed on the outer side of the outer field member.

A self-adjusting bearing assembly comprising a rod end bearing having a ball member and a connector member, and a bearing seat component having at least two bearing seat members arranged to receive the ball member therebetween. The ball member has a substantially spherical segment providing an outer bearing surface, and the bearing seat members include spherically-shaped inner bearing surfaces for engaging the outer bearing surface of the ball member. The connector member extends through a conical passage formed by the bearing seat members, and this passage restricts pivotal movement of the rod end bearing. A slack removal mechanism urges a movable one of the bearing seat members toward the ball member; and comprises a pressure chamber adjacent a pressure surface of the movable bearing seat member, and a fitting for pressurizing this chamber with a fluid. The assembly may include a fitting for feeding lubricant to the bearing surfaces, and a fitting for preventing excessive chamber pressure.

A self-adjusting bearing assembly comprising a ball member, a connector member, and a bearing seat component having at least two seat members arranged to receive the ball member therebetween. The ball member has a shaped segment providing an outer bearing surface, and the seat members include correspondly shaped inner bearing surfaces for engaging the outer bearing surface of the ball member. A slack removal mechanism is provided to urge a movable one of the seat members toward the ball member and may comprise a pressure chamber having a wall formed by a resilient diaphram positioned adjacent a pressure surface of the movable seat member, and a fitting for pressurizing this chamber with a fluid. The assembly may include a second fitting for feeding lubricant from the pressure chamber to the bearing surfaces. Optionally, a screw member may be provided for exerting an adjustable mechanical force to urge the movable seat member against the ball member.