A power transmission device of a steering system. A first connector includes a first coupling portion coupled to a first shaft and first supporting portions protruding axially from the first coupling portion. A second connector includes a second coupling portion coupled to a second shaft disposed coaxially with the first shaft and second supporting portions protruding axially from the second coupling portion to be circumferentially spaced apart from the first supporting portions. A damper is coupled axially between the first connector and the second connector, and includes blades supported circumferentially between the first supporting portions and the second supporting portions.

A power transmission device of a steering system. A first connector includes a first coupling portion coupled to a first shaft and first supporting portions protruding axially from the first coupling portion. A second connector includes a second coupling portion coupled to a second shaft disposed coaxially with the first shaft and second supporting portions protruding axially from the second coupling portion to be circumferentially spaced apart from the first supporting portions. A damper is coupled axially between the first connector and the second connector, and includes blades supported circumferentially between the first supporting portions and the second supporting portions.

The torque transmission joint includes an intermediate transmission member, and a first transmission member and a second transmission member that are arranged with one each on both side sections in the axial direction of the intermediate transmission member, with the outer side sections in the radial direction of each engaging with the inside section in the radial direction of the intermediate transmission member. The first transmission member and the second transmission member have a first preliminary engagement section and a second preliminary engagement section at the end sections in the axial direction on sides close to each other. The first preliminary engagement section and the second preliminary engagement section engage with each other with a circumferential gap interposed therebetween that does not disappear when torque transmission is performed between the first transmission member and the second transmission member via the intermediate transmission member.

A coupling (1,2) has an inner member (111) and an outer annular member (131) and an intermediate annular member (121) which when aligned share a common axis and have a common centre on the common axis. The inner and the intermediate annular member are constrained to rotate, one with respect to the other about a second axis perpendicular to the common axis. The intermediate annular member and the outer annular member are constrained to rotate, one with respect to the other about a third axis (Z) perpendicular to the common axis (X) and the second axis (Y). The members are spaced apart to leave a gap (103) between each of the members.

A coupling (1,2) has an inner member (111) and an outer annular member (131) and an intermediate annular member (121) which when aligned share a common axis and have a common centre on the common axis. The inner and the intermediate annular member are constrained to rotate, one with respect to the other about a second axis perpendicular to the common axis. The intermediate annular member and the outer annular member are constrained to rotate, one with respect to the other about a third axis (Z) perpendicular to the common axis (X) and the second axis (Y). The members are spaced apart to leave a gap (103) between each of the members.

A main bearing unit for supporting the rotor shaft of a wind turbine, including a rolling bearing having an inner ring, an outer ring and a rolling element arrangement received between the outer and inner ring and a coupling arrangement which is designed to couple the rotor shaft to an output shaft of the wind turbine at least indirectly and so as to transmit torque. The rotor shaft is coupled to one of the outer and inner ring so as to transmit torque. The coupling arrangement is coupled so as to transmit torque to the one of the outer and inner ring as the rotor shaft.

Provided is a reducer of an electric power steering apparatus. The reducer has a significantly reduced volume, a decreased number of components, and a shortened production process and can prevent vibration and noise generated during power transfer while removing noise caused by a clearance between a shaft and a power transfer member.

Provided is a reducer of an electric power steering apparatus. The reducer has a significantly reduced volume, a decreased number of components, and a shortened production process and can prevent vibration and noise generated during power transfer while removing noise caused by a clearance between a shaft and a power transfer member.

Provided are a rotation assist tool 10 attached to a base side of a rotary shaft 12 having an output unit 11 on a front side thereof and a assist-attached rotation tool 31 including the rotation assist tool 10. The rotation assist tool 10 has a first rotating body 13; a second rotating body 14 that is held by the first rotating body 13 to be rotatable in forward and reverse directions; and at least one elastically deformable body 22 that is elastically deformed as the first rotating body 13 and the second rotating body 14 rotate relative to each other, and transmits rotation between the first rotating body 13 and the second rotating body 14, wherein the base side of the rotary shaft 12 is fixed to the first rotating body 13.

A driver for coupling a driving device and a driven device includes a core defining a plurality of corner chamfers and a casing formed on and encasing the core. The casing has a contoured perimeter surface and a variable casing thickness, and is compressible during an interference fit installation to a coupling socket to provide a non-lubricated coupling which has zero backlash and substantially no running noise. The core is made of a metal-based material and includes a shaft bore for receiving an input shaft. In an illustrative example, the driver core is made of a stainless steel core and the casing is made of a high wear thermoset urethane material. The metal core can be recycled from the coated driver by removal of the polymeric casing, then recoated with a new casing to form a new coated driver including the recycled metal core.