JP2016031114A5

JP2016031114A5 -

Info

Publication number: JP2016031114A5
Application number: JP2014154006A
Authority: JP
Filing date: 2014-07-29
Publication date: 2016-10-13
Anticipated expiration: 2034-07-29

Description

上記した目的を達成するために、本発明の磁性流体シール付き軸受は、磁性を有する内輪及び外輪間に、磁性を有する転動体を転動可能に介在した軸受本体と、前記転動体を挟んで前記軸受本体の軸方向の両側にそれぞれ一体的に保持され、前記軸受本体の内部を磁気的にシールする一対の磁性流体シールと、を有する構成であって、前記各磁性流体シールは、磁石と、この磁石を保持する極板と、前記内輪または前記外輪と前記磁石との間の隙間に保持される磁性流体とを有し、前記一対の磁性流体シールの各磁石は、前記内輪および外輪の一方側に非磁性体であるスペーサを介在して取着され、他方側に前記転動体をシールする磁性流体を保持していることを特徴とする。
In order to achieve the above-described object, a bearing with a magnetic fluid seal according to the present invention includes a bearing body in which a rolling element having magnetism is interposed between an inner ring and an outer ring having magnetism, and the rolling element is sandwiched between A pair of magnetic fluid seals that are integrally held on both sides in the axial direction of the bearing body and magnetically seal the interior of the bearing body, wherein each of the magnetic fluid seals includes a magnet, A magnetic plate that holds the magnet, and a magnetic fluid that is held in a gap between the inner ring or the outer ring and the magnet, and each magnet of the pair of magnetic fluid seals includes an inner ring and an outer ring. The magnetic fluid is attached to one side through a spacer that is a non-magnetic material, and the other side holds a magnetic fluid that seals the rolling element.

Claims

A bearing body in which a rolling element having magnetism is interposed between an inner ring and an outer ring having magnetism so as to roll;
A pair of magnetic fluid seals that are integrally held on both sides in the axial direction of the bearing body across the rolling element, and magnetically seal the interior of the bearing body;
A bearing with a magnetic fluid seal having
Each of the magnetic fluid seals includes a magnet, an electrode plate that holds the magnet, and a magnetic fluid that is held in a gap between the inner ring or the outer ring and the magnet,
Each magnet of the pair of magnetic fluid seals is attached to one side of the inner ring and the outer ring with a spacer that is a non-magnetic material, and holds the magnetic fluid that seals the rolling elements on the other side. A bearing with a magnetic fluid seal.

The magnet of the magnetic fluid seal on one side of the pair of magnetic fluid seals holds the spacer with the inner ring, and the magnet of the magnetic fluid seal on the other side holds the spacer with the outer ring. And
The magnets of the pair of magnetic fluid seals are magnetized so that the magnetic poles are oriented in the axial direction of the bearing body, and the magnetic poles facing each other across the rolling element are the same. Item 2. A bearing with a magnetic fluid seal according to Item 1.

Each magnet of the pair of magnetic fluid seals holds the spacer between the inner ring and the outer ring,
The magnets of the pair of magnetic fluid seals are magnetized so that the magnetic poles are oriented in the axial direction of the bearing body, and the magnetic poles on the sides facing each other with the rolling elements interposed therebetween are different. A bearing with a magnetic fluid seal according to 1.

Each of the inner ring and the outer ring has a stepped portion,
The magnets of the pair of magnetic fluid seals are positioned in the axial direction by the spacers being brought into contact with the stepped portions, and the opposite end portions of the spacers are in the gap between the stepped portions. The magnetic fluid-sealed bearing according to any one of claims 1 to 3, wherein the magnetic fluid is retained.