Gear drive device

Patent metadata

Field	Value
Publication number	US-10393240-B2
Application number	US-201715462193-A
Country	US
Kind code	B2
Filing date	Mar 17, 2017
Priority date	Mar 23, 2016
Publication date	Aug 27, 2019
Grant date	Aug 27, 2019

Abstract

A gear drive device includes a first gear, a second gear that meshes with the first gear to allow torque transmission, and a biasing member that applies rotational torque in one direction to the first gear or the second gear. The first gear and the second gear are brought into contact at a contacting tooth surface thereof by the biasing member. At least one of the first gear and the second gear includes a non-contacting tooth surface that is on an opposite side of the contacting tooth surface and partially removed.

First claim

What is claimed is:

1. A gear drive device, comprising:
a first gear;
a second gear that meshes with the first gear to allow torque transmission;
a driving mechanism that applies a driving torque to the first and second gears, and
a biasing member separate from the driving mechanism that applies rotational torque in one direction to the first gear or the second gear,
wherein the first gear and the second gear are brought into contact at a contacting tooth surface thereof by the biasing member, and
wherein at least one of the first gear and the second gear comprises a non-contacting tooth surface that is on an opposite side of the contacting tooth surface and partially removed.

2. The gear drive device according to claim 1 , wherein the non-contacting tooth surface is removed so as to maintain torque transmission between the first gear and the second gear.

3. The gear drive device according to claim 1 , wherein the non-contacting tooth surface is removed along a line that contacts a tooth root R of a tooth root and extends toward a tooth tip.

4. The gear drive device according to claim 1 , wherein the non-contacting tooth surface is formed on a tooth portion in a range where the first gear and the second gear mesh.

5. The gear drive device according to claim 1 , wherein at least one of the first gear and the second gear comprises the contacting tooth surface formed with an involute curve.

6. The gear drive device according to claim 1 , wherein at least one of the first gear and the second gear comprises a sector gear.

Assignees

• Tokai Rika Co Ltd

Inventors

• Kubo Yuki
• Ishigaki Seiji

Classifications

• F16H55/0886

  with corrections along the width, e.g. flank width crowning for better load distribution · CPC title

• F16H55/0806

  Involute profile · CPC title

• F16H19/08 Primary

  for interconverting rotary motion and oscillating motion · CPC title

• F16H55/17

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

• F16H19/001 Primary

  for conveying reciprocating or limited rotary motion · CPC title