Shaving processing method and shaving processing apparatus for gear

Patent metadata

Field	Value
Publication number	US-11192198-B2
Application number	US-202016953053-A
Country	US
Kind code	B2
Filing date	Nov 19, 2020
Priority date	Dec 20, 2019
Publication date	Dec 7, 2021
Grant date	Dec 7, 2021

Abstract

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.

First claim

What is claimed is:

1. A shaving processing method for finishing a tooth surface of a gear in a state where the gear and at least a first shaving cutter are engaged with each other and the first shaving cutter is rotated, the gear comprising a circumference that extends around a central axis of the gear and connects a pair of end surfaces facing each other in a tooth width direction and spaced from each other in a direction of the central axis, the method comprising:
performing a first shaving step of processing the tooth surface so that a radial dimension of a processing region of material being removed gradually gets smaller as machining performed by the first shaving cutter proceeds from one end surface of the pair of end surfaces toward the other end surface; and
performing a second shaving step of processing the tooth surface so that a radial dimension of a processing region of material being removed gradually gets smaller as machining performed by either the first shaver cutter or a second shaving cutter proceeds from the other end surface of the pair of end surfaces toward the one end surface.

2. The shaving processing method according to claim 1 , wherein
an intersection angle between the central axis of the gear and a central axis of the first shaving cutter is set to a first intersection angle in the first shaving step, and an intersection angle between the central axis of the gear and the central axis of the first shaving cutter is set to a second intersection angle in the second shaving step,
the first intersection angle is larger than the second intersection angle, and
the second intersection angle corresponds to a finishing condition of the tooth surface.

3. The shaving processing method according to claim 2 , wherein an intersection angle between a central axis of a shaft supporting the gear and a central axis of a shaft supporting the first shaving cutter is set to the first intersection angle in the first shaving step and is set to the second intersection angle in the second shaving step.

4. The shaving processing method according to claim 2 , wherein the first shaving cutter is used for the second shaving step and a rotational direction of the first shaving cutter is switched to an opposite direction for the second shaving step.

5. The shaving processing method according to claim 1 , wherein
an intersection angle between the central axis of the gear and a central axis of the first shaving cutter is set to a first intersection angle in the first shaving step, and an intersection angle between the central axis of the gear and a central axis of the second shaving cutter is set to a second intersection angle in the second shaving step,
in the first shaving step, the first shaving cutter is used and comprises a first cutting tooth extending in a direction corresponding to the first intersection angle, and
in the second shaving step, the second shaving cutter is used and comprises a second cutting tooth extending in a direction corresponding to the second intersection angle.

6. The shaving processing method according to claim 1 , wherein an intersection angle between a central axis of a shaft supporting the gear and a central axis of a shaft supporting the first shaving cutter is set to a first intersection angle in the first shaving step and is set to a second intersection angle in the second shaving step.

7. The shaving processing method according to claim 1 , wherein
in the first shaving step, the first shaving cutter is used and comprises a first cutting tooth extending in a direction corresponding to a first intersection angle between the central axis of the gear and a central axis of the first shaving cutter, and
in the second shaving step, the second shaving cutter is used and comprises a second cutting tooth extending in a direction corresponding to a second intersection angle between the central axis of the gear and a central axis of the second shaving cutter.

8. The shaving processing method according to claim 1 , wherein the first shaving cutter is used for the second shaving step and a rotational direction of the first shaving cutter is switched to an opposite direction for the second shaving step.

Assignees

• Mazda Motor

Inventors

• Teramoto Yoshihiro
• Ueno Ryoichi

Classifications

• B23F5/163

  the tool and workpiece being in crossed axis arrangement, e.g. skiving, i.e. "Waelzschaelen" · CPC title

• B23F5/202 Primary

  the tool having a shape similar to that of a gear or part thereof, with cutting edges situated on the tooth contour lines (tools therefor B23F21/122) · CPC title

• B23F19/06 Primary

  Shaving the faces of gear teeth · CPC title

• B23F5/22

  the tool being a hob for making spur gears · CPC title

• B23F19/007

  using a gear-shaped tool · CPC title