To provide a rotating member and a forming method thereof that allow formation of protrusions biting into an opposite surface to achieve high slip torque with a simple configuration. The rotating member includes a boss part and an anti-slip surface at least on one of both axial end faces of the boss part. The anti-slip surface has a plurality of corrugated rib parts, which includes a main groove and at least one auxiliary groove extending parallel to the main groove, with a ridge protruding higher than the anti-slip surface between the main groove and the auxiliary groove.

Method for producing a compound, rotationally symmetrical component (3) with internal and external teeth consisting of a blank (1) and a toothed body (5), wherein the two parts (1, 5) are designed in the form of a pot and in a first method step are inserted coaxially one inside another with interlocking, mutual support and in a second method step are interlocked together with at least one forming tool (17, 27) applied against the (inner and/or outer) circumference, wherein in the second method step the circumferential surface (14, 14) of said blank (1) is continuously deformed in a rolling forming process in the axial direction and in the radial direction such that the circumferential surface (14, 14) of the blank (1) is deformed to interlock into the tooth bases (10) of the teeth (6) of the toothed body (5).

A method for forging a gear according to the present disclosure includes pushing a material into a molding space of a teeth profile die from one side of the teeth profile die for molding external teeth by a punch, and after the pushing, discharging a gear having the external teeth formed thereon from another side of the teeth profile die by the punch. The method further includes providing a material outer diameter constraint die for constraining an outer diameter of a previous material before the material is pushed into the molding space of the teeth profile die on the one side of the teeth profile die, and setting an inner diameter size of the material outer diameter constraint die to be smaller than a large diameter size of the gear set in the teeth profile die.

A method for forging a gear according to the present disclosure includes pushing a material into a molding space of a teeth profile die from one side of the teeth profile die for molding external teeth by a punch, and after the pushing, discharging a gear having the external teeth formed thereon from another side of the teeth profile die by the punch. The method further includes providing a material outer diameter constraint die for constraining an outer diameter of a previous material before the material is pushed into the molding space of the teeth profile die on the one side of the teeth profile die, and setting an inner diameter size of the material outer diameter constraint die to be smaller than a large diameter size of the gear set in the teeth profile die.

A synchronizer ring for a synchronization unit of a manual transmission is produced from a sheet metal material and has a conical friction surface on the inner side thereof and has a device for radial centering of the synchronizer ring on the outer side thereof. The device for radial centering includes a plurality of separate arc-shaped centering collar portions spaced apart from one another in the circumferential direction.

Mating bevel gears generally include a pinion gear having a body that rotates about an axis and a side gear having a body that rotates about an axis that intersects the axis of the pinion gear. Pinion gear teeth of the pinion gear have a side that defines a curvature with an involute section through which a pitch line extends and a parabolic shape between the pinion gear teeth. Side gear teeth of the side gear have a side that defines a curvature with an involute section through which a pitch line extends and a parabolic shape between the side gear teeth. The curvatures on the pinion and the side gear teeth cooperatively define a controlled relative radius of curvature section except where the involute sections are located. The controlled relative radius of curvature section defines a sum of values of radius of curvature at a point of contact between the curvatures of the pinion gear teeth and the side gear teeth. The sum has a constant or decreasing value.

Mating bevel gears generally include a pinion gear having a body that rotates about an axis and a side gear having a body that rotates about an axis that intersects the axis of the pinion gear. Pinion gear teeth of the pinion gear have a side that defines a curvature with an involute section through which a pitch line extends and a parabolic shape between the pinion gear teeth. Side gear teeth of the side gear have a side that defines a curvature with an involute section through which a pitch line extends and a parabolic shape between the side gear teeth. The curvatures on the pinion and the side gear teeth cooperatively define a controlled relative radius of curvature section except where the involute sections are located. The controlled relative radius of curvature section defines a sum of values of radius of curvature at a point of contact between the curvatures of the pinion gear teeth and the side gear teeth. The sum has a constant or decreasing value.

Provided is a manufacturing method for a cylindrical portion in a cylindrical shape protruding in a plate thickness direction of a plate-like portion made of metal, the cylindrical portion being formed integrally with the plate-like portion. The manufacturing method uses a manufacturing device including: a first metal mold provided with an inner circumferential surface that comes in contact with an outer circumferential surface of the cylindrical portion; a second metal mold coming in contact with a protruding tip of the cylindrical portion; and a third metal mold coming into press contact with a workpiece toward a side of the second metal mold. The third metal mold is displaced toward the side of the second metal mold and a portion of the workpiece undergoes plastic flow toward the inner circumferential surface, whereby the portion that underwent the plastic flow comes into press contact with the inner circumferential surface.

Provided is a manufacturing method for a cylindrical portion in a cylindrical shape protruding in a plate thickness direction of a plate-like portion made of metal, the cylindrical portion being formed integrally with the plate-like portion. The manufacturing method uses a manufacturing device including: a first metal mold provided with an inner circumferential surface that comes in contact with an outer circumferential surface of the cylindrical portion; a second metal mold coming in contact with a protruding tip of the cylindrical portion; and a third metal mold coming into press contact with a workpiece toward a side of the second metal mold. The third metal mold is displaced toward the side of the second metal mold and a portion of the workpiece undergoes plastic flow toward the inner circumferential surface, whereby the portion that underwent the plastic flow comes into press contact with the inner circumferential surface.

A method for manufacturing a gear includes providing a rim gear, a hub and a core wherein the core is annular and has a core forging temperature below a hot hardness temperature of the rim gear and the hub. The rim gear and the hub are rotated about an axis relative to the core. During the relative rotation, the rim gear and the hub are in contact with the core to generate friction heat to raise an interface temperature of the core to the core forging temperature. The hub is driven into the core to upset a first portion of the core into an outer annular groove defined in a first faying surface of the hub. The rim gear is driven over the core to upset a second portion of the core into an inner annular groove defined in a second faying surface of the rim gear.