Gear and method for producing same
AssigneeEnplas Corporation
InventorKenji OHMI
Life of this patent
Estimating the term…
Abstract
A gear including plural teeth 3 to mesh with teeth of a corresponding gear to thereby transmit a rotational motion is provided. A form (b) of a tooth root side of each tooth 3 includes: a first curved surface c that is smoothly connected to a tooth surface a having an involute curve and has a profile expressed by a curve that is convex in an inverse direction of the involute curve of the tooth surface a; and a second curved surface d that is smoothly connected to the first curved surface c and has a profile defined by a hyperbolic function having a curve being convex in the same direction as the first curved surface c. It is possible to reduce a stress generated on the tooth root side at the time of meshing with teeth of the corresponding gear and thus to increase the strength of the teeth.
Claims4
A gear comprising a plurality of teeth to mesh with teeth of a corresponding gear to thereby transmit a rotational motion,
- wherein a form of a tooth root side of each tooth is identical to a form shaped by a gear-generation cutting using a rack-type cutter having a blade edge including a round portion with a curve defined by a hyperbolic function.
A method of producing a gear comprising a plurality of teeth to mesh with teeth of a corresponding gear to thereby transmit a rotational motion, the method comprising the step of:
- forming a tooth root side of each tooth to a form identical to a form shaped by gear-generation cutting using a rack-type cutter having a blade edge including a round portion with a curve defined by a hyperbolic function.
Dependencies are inferred from the claim text.