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US 7,178,420 B2Granted
Ring gear
AssigneeRobert Bosch GmbH
InventorWalter Barth
Life of this patent
Estimating the term…
Abstract
A ring gear includes teeth (10) and tooth gaps (12), in which the teeth (10) can be brought vie tooth flanks (14) into engagement with a corresponding pinion. The tooth flanks (14), after a final engagement point (16) of the pinion, from the tooth head (18) toward the tooth base (20), compared to standard tooth flanks (22), are made to approximate a trochoid (24, 26), described by the pinion and projected into a normal section.
Claims5
A ring gear with teeth (10) and tooth gaps (12), in which the teeth (10) can be brought into engagement with a corresponding pinion via tooth flanks (14),
- wherein each of said tooth flanks has a first part that corresponds to involute flanks and a second part located after a final engagement point of the pinion, as viewed in a direction from a tooth head toward a tooth base, wherein the second part corresponds to non-involute flanks and compared to involute flanks of standard tooth flanks approximate an orbit of the pinion, wherein the orbit is determined by the first part of the tooth flanks and forms a trochoid when the orbit is projected in a normal section.
Dependencies are inferred from the claim text.