Patent ID: 11904383
Assignee: NSK LTD.
Field: Machine tools (Mechanical engineering)
Classification: CPC B  F | IPC B  F

Claim 7:
8. An orbital forging device, comprising:
a frame having a reference axis,
a swinging shaft having a center axis, an end section on one side in an axial direction thereof, and an end on the other side in the axial direction, the center axis arranged to be inclined with respect to the reference axis,
a convex spherical seat having one side section in the axial direction of the swinging shaft, the other side section in the axial direction of the swinging shaft, and a convex spherical surface section provided on the other side section, the convex spherical seat connected to the end section on the one side in the axial direction of the swinging shaft to be coaxial with the swinging shaft,
a molding die comprising a machining surface section in a side surface on the one side in the axial direction of the swinging shaft, the molding die connected to the side surface on the one side of the convex spherical seat to be coaxial with the swinging shaft,
a concave spherical seat fixed to the frame and comprising a concave spherical surface section which spherically engages with the convex spherical surface section and an insertion hole to which the swinging shaft is inserted, and
a driving mechanism assembled in the frame and connected to the end section on the other side in the axial direction of the swinging shaft to provide driving force to the end section on the other side in the axial direction of the swinging shaft for rotating a connected body of the swinging shaft, the convex spherical seat, and the molding die around the reference axis,
wherein the driving mechanism comprises a bearing support, the bearing support supported to the frame rotatably around the reference axis of the frame,
the end section on the other side in the axial direction of the swinging shaft is inserted through the retention hole of the bearing holder,
a rolling bearing is arranged between the retention hole and the end section on the other side in the axial direction of the swinging shaft, and
the end section on the other side in the axial direction of the swinging shaft is supported with respect to the driving mechanism in a state where a movement thereof toward the one side in the axial direction is prevented by the rolling bearing,
the bearing support, comprising:
a case member having a holding recess, the holding recess having an inner peripheral surface and a bottom section;
a bearing holder having an outer peripheral surface and a retention hole inside which the rolling bearing is fitted; and
a holding member arranged between the inner peripheral surface of the holding recess and the outer peripheral surface of the bearing holder, to which preload in a direction toward the bottom section of the holding recess is applied;
wherein the holding member regulates a position of the bearing holder with respect to the holding recess due to wedge effect.