Sintered bearing

Patent metadata

Field	Value
Publication number	US-9441670-B2
Application number	US-201514976437-A
Country	US
Kind code	B2
Filing date	Dec 21, 2015
Priority date	Mar 7, 2012
Publication date	Sep 13, 2016
Grant date	Sep 13, 2016

Abstract

Provided is a sintered bearing ( 1 ) including an inner layer ( 2 ) and an outer layer ( 3 ) formed by integral molding, the sintered bearing ( 1 ) having a bearing surface (A) formed on an inner peripheral surface ( 2 a ) of an inner layer ( 2 ). The inner layer ( 2 ) is made of sintered metal containing Fe and a hardness increasing element (such as Ni or Mo). The outer layer ( 3 ) is made of sintered metal containing Fe and no hardness increasing element. A concentration gradient of the hardness increasing element is present at an interface between the inner layer ( 2 ) and the outer layer ( 3 ).

First claim

The invention claimed is:

1. A sintered bearing, comprising:
an inner layer;
an outer layer formed on a radially outer side of the inner layer; and
a bearing surface formed on any one of an inner peripheral surface of the inner layer and an outer peripheral surface of the outer layer,
wherein one of the inner layer and the outer layer, which has the bearing surface, is made of sintered metal containing Fe and a hardness increasing element, and another of the inner layer and the outer layer, which has no bearing surface, is made of sintered metal containing Fe and no hardness increasing element,
wherein the inner layer and the outer layer contain Cu, and
wherein a mixing ratio of the Cu in the another of the inner layer and the outer layer, which has no bearing surface, is lower than a mixing ratio of the Cu in the one of the inner layer and the outer layer, which has the bearing surface.

2. The sintered bearing according to claim 1 , wherein the hardness increasing element comprises at least one kind selected from among Ni, Mo, Mn, and Cr.

3. The sintered bearing according to claim 1 , wherein the bearing surface is formed on the inner peripheral surface of the inner layer.

4. The sintered bearing according to claim 3 , wherein the inner layer is made of sintered metal containing Fe, Cu, C, Ni, Mo, and inevitable impurities as the balance, and the outer layer is made of sintered metal containing Fe, Cu, C, and inevitable impurities as the balance.

5. The sintered bearing according to claim 1 , wherein the sintered bearing is used at a joint section of an arm of construction machinery.

6. A sintered bearing, comprising:
an inner layer;
an outer layer formed on a radially outer side of the inner layer; and
a bearing surface formed on any one of an inner peripheral surface of the inner layer and an outer peripheral surface of the outer layer,
wherein one of the inner layer and the outer layer, which has the bearing surface, is made of sintered metal containing Fe, Cu, C, Ni, Mo, and inevitable impurities as the balance, and another of the inner layer and the outer layer, which has no bearing surface, is made of sintered metal containing Fe, Cu, C, and inevitable impurities as the balance.

7. The sintered bearing according to claim 6 , wherein the bearing surface is formed on the inner peripheral surface of the inner layer.

8. The sintered bearing according to claim 6 , wherein the sintered bearing is used at a joint section of an arm of construction machinery.

Assignees

• Mouri Toshihiko
• Yoshizuka Noriyoshi
• Sugai Yousuke
• Satoji Fuminori
• Ntn Toyo Bearing Co Ltd

Inventors

• Mouri Toshihiko
• Yoshizuka Noriyoshi
• Sugai Yousuke
• Satoji Fuminori

Classifications

• B22F3/02

  Compacting only · CPC title

• B22F5/106

  Tube or ring forms · CPC title

• B22F2003/241

  Chemical after-treatment on the surface · CPC title

• B22F3/16

  in successive or repeated steps · CPC title

• B22F2003/033

  with multiple punches working in the same direction · CPC title