Metal core for resin gear and resin gear composite member

Patent metadata

Field	Value
Publication number	US-9856965-B2
Application number	US-201414894046-A
Country	US
Kind code	B2
Filing date	May 28, 2014
Priority date	May 31, 2013
Publication date	Jan 2, 2018
Grant date	Jan 2, 2018

Abstract

A metal core for a resin gear and a resin gear composite member are provided. The metal core includes a boss portion into which a shaft is press-fitted, a ring portion to which an outer peripheral resin is joined, and a connecting portion via which the boss portion and the ring portion are coaxially provided. The boss portion is arranged on one side of the connecting portion at an inner circumference of the connecting portion and extends annularly in an axial direction. The ring portion is arranged on the same side of the connecting portion at an outer circumference of the connecting portion and extends annularly in the axial direction. The boss portion, the connecting portion, and the ring portion are formed of an integrally continuous material. The boss portion is thicker than the connecting portion and the ring portion.

First claim

The invention claimed is:

1. A metal core for a resin gear, the metal core comprising:
a boss portion into which a shaft is press-fitted;
a ring portion having an outer circumferential surface provided with a concave-convex structure and to which an outer peripheral resin is joined; and
a connecting portion via which the boss portion and the ring portion are coaxially provided,
wherein the boss portion is arranged on one side of the connecting portion at an inner circumference of the connecting portion and extends annularly in an axial direction,
wherein the ring portion is arranged on the same side of the connecting portion at an outer circumference of the connecting portion and extends annularly in the axial direction,
wherein the boss portion, the connecting portion, and the ring portion are formed of an integrally continuous material,
wherein the metal core is made of a metal plate and the boss portion is thicker than the connecting portion and the ring portion, and
wherein the outer circumferential surface of the ring portion includes a smooth section on each of opposite sides of the concave-convex structure in the axial direction, the smooth sections having a same diameter.

2. The metal core according to claim 1 , wherein the metal core is adapted to be used for a resin gear of a power steering apparatus, and the boss portion is adapted to receive the shaft to which a steering force is transmitted.

3. The metal core according to claim 1 , wherein a thickness of the boss portion is in a range of 1.1 or more to 1.3 or less times a maximum thickness of the ring portion.

4. The metal core according to claim 1 , wherein a portion between the boss portion and the connecting portion and a portion between the connecting portion and the ring portion are each formed with a continuous metal flow.

5. A resin gear composite member comprising:
a metal core; and
an outer peripheral resin provided with gear teeth,
wherein the metal core comprises:
a boss portion into which a shaft is press-fitted;
a ring portion having an outer circumferential surface provided with a concave-convex structure and to which the outer peripheral resin is joined; and
a connecting portion via which the boss portion and the ring portion are coaxially provided,
wherein the boss portion is arranged on one side of the connecting portion at an inner circumference of the connecting portion and extends annularly in an axial direction,
wherein the ring portion is arranged on the same side of the connecting portion at an outer circumference of the connecting portion and extends annularly in the axial direction,
wherein the boss portion, the connecting portion, and the ring portion are formed of an integrally continuous material,
wherein the metal core is made of a metal plate and the boss portion is thicker than the connecting portion and the ring portion, and
wherein the outer circumferential surface of the ring portion includes a smooth section on each of opposite sides of the concave-convex structure in the axial direction, the smooth sections having a same diameter.

6. The metal core according to claim 1 , wherein the boss portion has an end surface and the connecting portion has an end surface that is coplanar with the end surface of the boss portion.

7. The metal core according to claim 6 , wherein the end surface of the connecting portion is continuous with the end surface of the boss portion.

8. The resin gear composite member according to claim 5 , wherein the boss portion has an end surface and the connecting portion has an end surface that is coplanar with the end surface of the boss portion.

9. The resin gear composite member according to claim 8 , wherein the end surface of the connecting portion is continuous with the end surface of the boss portion.

10. A resin gear composite member comprising:
a metal core; and
an outer peripheral resin provided with gear teeth,
wherein the metal core comprises:
a boss portion into which a shaft is press-fitted;
a ring portion having an outer circumferential surface provided with a concave-convex structure and to which the outer peripheral resin is joined; and
a connecting portion via which the boss portion and the ring portion are coaxially provided,
wherein the boss portion is arranged on one side of the connecting portion at an inner circumference of the connecting portion and extends annularly in an axial direction,
wherein the ring portion is arranged on the same side of the connecting portion at an outer circumference of the connecting portion and extends annularly in the axial direction,
wherein the boss portion, the connecting portion, and the ring portion are formed of an integrally continuous material,
wherein the metal core is made of a metal plate and the boss portion is thicker than the connecting portion and the ring portion, and
wherein the ring portion has a pair of opposing end surfaces and the outer peripheral resin has a pair of opposing end surfaces, each of the opposing end surfaces of the ring portion being coplanar with a respective one of the opposing end surfaces of the outer peripheral resin.

Assignees

• Neturen Co Ltd

Inventors

• Ishiki Nobumoto
• Suzuki Ryosuke

Classifications

• F16H55/22 Primary

  for transmissions with crossing shafts, especially worms, worm-gears · CPC title

• F16H2055/065

  Moulded gears, e.g. inserts therefor · CPC title

• F16H55/06

  Use of materials; Use of treatments of toothed members or worms to affect their intrinsic material properties · CPC title

• B62D3/04

  of worm type · CPC title