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.

A drill chuck having a chuck body connectable to a drilling spindle, in which are arranged clamping jaws in guide seats extending at an angle to the chuck axis, which are movable for opening and closing via a threaded ring that is arranged to be immovable relative to the chuck body. A locking device includes a coaxial ring of locking recesses as well as a locking element that is engaged in the locking recesses under the force of a locking spring. An adjusting ring rotatable to a limited extent between stops, the rotation of which adjusts the locking element. A detent device creating two detent positions in the circumferential direction. Attached to the axially forward section of the chuck body in a rotationally fixed and axially immovable manner is a locking sleeve that carries the ring of locking recesses and serves to axially secure the threaded ring.

A drill chuck having a chuck body connectable to a drilling spindle, in which are arranged clamping jaws in guide seats extending at an angle to the chuck axis, which are movable for opening and closing via a threaded ring that is arranged to be immovable relative to the chuck body. A locking device includes a coaxial ring of locking recesses as well as a locking element that is engaged in the locking recesses under the force of a locking spring. An adjusting ring rotatable to a limited extent between stops, the rotation of which adjusts the locking element. A detent device creating two detent positions in the circumferential direction. Attached to the axially forward section of the chuck body in a rotationally fixed and axially immovable manner is a locking sleeve that carries the ring of locking recesses and serves to axially secure the threaded ring.

Disclosed is a cold forged gear steel. In addition to Fe and inevitable impurities, the cold forged gear steel further comprises the following chemical elements in mass percentage: 0.15-0.17% of C, 0.10-0.20% of Si, 1.0-1.10% of Mn, 0.80-0.90% of Cr and 0.02-0.04% of Al. Correspondingly, further disclosed is a manufacturing method for the cold forged gear steel, comprising the steps of: (1) smelting and casting; (2) heating; (3) forging or rolling; and (4) spheroidizing annealing: heating to and keeping at 750-770? C., then cooling with a cooling rate of 5-15? C./h to and keeping at 700-720? C., cooling with a cooling rate of 3-12? C./h to and keeping at 660-680? C., and cooling with a cooling rate of 5-20? C./h to 500? C. or below, and then tapping and cooling.

A gear (10) is located inside a constant mesh gear transmission. The gear includes dogs (20) on a side surface thereof. Each of the dogs has a recess (30) in a distal surface (25) thereof.

A method of manufacturing a gear having root fillets between adjacent teeth that are shot peered to improve compressive strength. A robot moves a shot peening nozzle between adjacent teeth. A servomotor drive indexes the gear in increments corresponding to one or more teeth. The nozzle has a tapered tip that is moved between adjacent tooth faces with clearance relative to the tooth faces.

A method of manufacturing a gear having root fillets between adjacent teeth that are shot peered to improve compressive strength. A robot moves a shot peening nozzle between adjacent teeth. A servomotor drive indexes the gear in increments corresponding to one or more teeth. The nozzle has a tapered tip that is moved between adjacent tooth faces with clearance relative to the tooth faces.

Rotary forging for forming a hub-side face spline is started in a state in which a caulking section is made to come in contact with a flat surface section that is an inner end surface of an inner ring in an axial direction and a chamfer. In addition, a contact portion between an inner end surface of the caulking section in the axial direction and a processing surface of a roll at the beginning of the rotary forging overlaps a contact portion between the caulking section and the flat surface section and the chamfer of the inner ring in the axial direction.

A gearwheel for a balance shaft includes a gear ring and a gear core, where the gear ring is fabricated of a first metal and the gear core of a second metal, where the second metal has a lower density than the first metal, where the gear core and the gear ring are compressed to each other at an inner surface of the gear ring, the gearwheel further including formfitting elements to form an additional formfitting between the gear ring and the gear core, where, as seen in a circumferential direction along the inner surface of the gear ring, a distance between two adjacent formfitting elements is larger than an extension of the formfitting element along the circumferential direction.

A gearwheel for a balance shaft includes a gear ring and a gear core, where the gear ring is fabricated of a first metal and the gear core of a second metal, where the second metal has a lower density than the first metal, where the gear core and the gear ring are compressed to each other at an inner surface of the gear ring, the gearwheel further including formfitting elements to form an additional formfitting between the gear ring and the gear core, where, as seen in a circumferential direction along the inner surface of the gear ring, a distance between two adjacent formfitting elements is larger than an extension of the formfitting element along the circumferential direction.