A method for machining a workpiece, includes: rotating a rotary tool around a rotation axis, the rotary tool including at least one edge positioned on an outer periphery of the rotary tool around the rotation axis; relatively moving the rotary tool toward the workpiece in a first direction so that the at least one edge cuts the workpiece by a predetermined depth while the rotary tool is rotated around the rotation axis; and relatively moving the rotary tool with respect to the workpiece in a second direction that is substantially perpendicular to the first direction and that is inclined to a third direction substantially perpendicular to the rotation axis and the first direction.

A method for machining a workpiece, includes: rotating a rotary tool around a rotation axis, the rotary tool including at least one edge positioned on an outer periphery of the rotary tool around the rotation axis; relatively moving the rotary tool toward the workpiece in a first direction so that the at least one edge cuts the workpiece by a predetermined depth while the rotary tool is rotated around the rotation axis; and relatively moving the rotary tool with respect to the workpiece in a second direction that is substantially perpendicular to the first direction and that is inclined to a third direction substantially perpendicular to the rotation axis and the first direction.

A method to form a gear for motor vehicles includes one or more of the following: placing a blank between a first tool member and a second tool member, each of the first tool member and the second tool member having a set of teeth; and moving the first tool member and the second tool member towards the blank while rotating the first tool member and the second tool member to form a gear with a set of teeth from the blank. Each tooth of the set of teeth has a topography that varies tooth-to-tooth.

A gear machining device is provided which can machine an accurate gear by a cutting process by synchronously rotating a machining tool and a workpiece at a high speed. A machining tool includes roughing cutting teeth for roughing bottom lands and right and left side faces of teeth of a gear, right side face finishing cutting teeth for finishing the right side faces of the teeth, and left side face finishing cutting teeth for finishing the left side faces of the teeth. The cutting teeth thus cut different parts of the teeth of the gear. This can reduce cutting resistance and suppress self-vibration during the cutting process, thereby improving tooth trace accuracy of the gear.

A gear machining device is provided which can machine an accurate gear by a cutting process by synchronously rotating a machining tool and a workpiece at a high speed. A machining tool includes roughing cutting teeth for roughing bottom lands and right and left side faces of teeth of a gear, right side face finishing cutting teeth for finishing the right side faces of the teeth, and left side face finishing cutting teeth for finishing the left side faces of the teeth. The cutting teeth thus cut different parts of the teeth of the gear. This can reduce cutting resistance and suppress self-vibration during the cutting process, thereby improving tooth trace accuracy of the gear.

A method of producing a throttle device includes setting an angle between a fully closed position and a default position to a predetermined angle by processing at least one of a gear-side fully closed position stopper on a throttle gear, a body-side fully closed position stopper on a throttle body, a default position defining member, a body-side engaging portion of the throttle body, or a gear-side engaging portion of the throttle gear.

A method of producing a throttle device includes setting an angle between a fully closed position and a default position to a predetermined angle by processing at least one of a gear-side fully closed position stopper on a throttle gear, a body-side fully closed position stopper on a throttle body, a default position defining member, a body-side engaging portion of the throttle body, or a gear-side engaging portion of the throttle gear.

A hobbing or gear cutting machine uses a rotary tool to rotate a cutting tool around a central axis of the cutting tool. The cutting tool has zero lead cutters, that is, the cutting tool is non-helical. A head holds the rotary tool and moves the cutting tool longitudinally along the central axis of the cutting tool. A workpiece holder holds a workpiece to be machined into a gear proximate the cutting tool. The workpiece holder selectively rotates the workpiece in conjunction with the longitudinal movement of the cutting tool via the head to cut both straight and helical gears from the workpiece.

A shaving processing method and apparatus for a gear are provided which reduce a load at the time of processing a tooth surface, thereby reducing a transmission error of the gear. Embodiments include a method for finishing the tooth surface of the gear in a state where the gear and a shaving cutter are engaged with each other and the shaving cutter is rotated. The gear has a pair of end surfaces facing each other in the tooth width direction. A first shaving step of processing the tooth surface is performed so that a processing region gradually expands from one end surface of the pair of end surfaces toward the other end surface, and a second shaving step of processing the tooth surface is performed so that a processing region gradually expands from the other end surface of the pair of end surfaces toward the one end surface.

The invention relates to a method for machining toothing systems, in which, for a series of workpieces with an identical target geometry, a toothing system is produced or machined on a respective workpiece in a first machining operation and, in a second machining operation, with a machining tool, additional tooth shaping of the toothing system resulting from the first machining - in particular, chamfering of a tooth end edge of this toothing system - is carried out in a relative positioning with respect thereto, wherein a controller of the second machining operation automatically detects, at least in part, a change in a workpiece property, which is in particular independent of the first machining operation, and/or in a setting of the first machining operation - in particular, with respect to a respectively predetermined reference - and carries out the relative positioning as a function of the detected change.