Convex gear tooth edge break

Patent metadata

Field	Value
Publication number	US-10295039-B2
Application number	US-201715412928-A
Country	US
Kind code	B2
Filing date	Jan 23, 2017
Priority date	Feb 4, 2016
Publication date	May 21, 2019
Grant date	May 21, 2019

Abstract

A method of manufacturing a gear is provided. The method includes forming a plurality of gear teeth in a surface of a gear, the gear teeth having tooth faces defining tooth edges including tooth edge flanks and tooth edge top land and generating a convex contour at an edge break of at least one of the tooth edge flanks and tooth edge top land.

First claim

What is claimed is:

1. A method of manufacturing a gear, the method comprising:
forming a plurality of gear teeth in a surface of a gear, the gear teeth having tooth faces defining tooth edges including tooth edge flanks and tooth edge top land; and
generating a convex contour at an edge break of at least one of the tooth edge flanks and tooth edge top land;
wherein a same tool is employed for forming the plurality of gear teeth in the surface of the gear and for generating the convex contour at the edge break of the at least one of the tooth edge flanks and tooth edge top land.

2. The method of claim 1 , further comprising hardening the gear.

3. The method of claim 1 , further comprising finishing surfaces of the gear.

4. The method of claim 1 , wherein the generating comprises a multi-axis movement of a machine to form the convex contour.

5. The method of claim 1 , wherein the generating comprises using an electrochemical grinding machine.

6. The method of claim 1 , wherein the convex contour is one of curved, tangential, pointed, radiused, and smooth.

7. The method of claim 1 , wherein the convex contour is a radial curve that is tangent to a gear tooth flank.

8. The method of claim 1 , wherein the gear teeth are splines.

9. The method of claim 1 , wherein the surface of the gear is an end face of the gear.

10. The method of claim 1 , wherein both the tooth edge flanks and the tooth edge top land have a convex contour.

11. The method of claim 1 , wherein generating the convex contour includes using an electrochemical grinding machine to form the convex contour.

12. The method of claim 11 , wherein forming the plurality of gear teeth in the surface of the gear includes using the electrochemical grinding machine to form the plurality of gear teeth in the surface of the gear.

13. The method of claim 12 , wherein generating the convex contour includes using a tip of a tip portion of a grinding spindle of the electrochemical grinding machine to generate the convex contour.

14. The method of claim 12 , wherein the convex contour is generated by a multi-axis movement of the electrochemical grinding machine that forms the convex contour.

15. The method of claim 11 , wherein the electrochemical grinding machine includes a grinding spindle, abrasive for removing material from the gear is attached or formed about a tip of a tip portion of the grinding spindle, and the machine has three spatial axes and one rotational axis to move the grinding spindle and turn the gear.

16. The method of claim 1 , wherein the convex contour is tip-grinded and generated by a multi-axis movement of an electrochemical grinding machine that forms the convex contour, and the machine additionally forms the plurality of gear teeth in the surface of the gear.

17. A gear manufactured by the method of claim 1 .

18. The method of claim 1 , wherein the tool includes a grinding spindle having a tip, the tip is operated to remove material of the gear to form the gear teeth, and the tip is used to form the convex edge break.

Assignees

• Sikorsky Aircraft Corp

Inventors

• Bittner Edward H
• Hansen Bruce D
• Mussel Christopher John

Classifications

• F16H55/17

  Toothed wheels (worm wheels F16H55/22; chain wheels F16H55/30) · CPC title

• F16H55/088 Primary

  with corrections on tip or foot of the teeth, e.g. addendum relief for better approach contact · CPC title

• B23H9/003 Primary

  Making screw-threads or gears · CPC title

• F16H2055/0866

  Profiles for improving radial engagement of gears, e.g. chamfers on the tips of the teeth · CPC title

• F16H55/0873

  for improving axial engagement, e.g. a chamfer at the end of the tooth flank · CPC title