JP2013047557A5

JP2013047557A5 -

Info

Publication number: JP2013047557A5
Application number: JP2011186398A
Authority: JP
Filing date: 2011-08-29
Publication date: 2014-10-23

Description

上記目的を達成するために、本発明は下記のスラスト軸受を提供する。
（１）外周面に軌道面を有し、回転可能な内輪と、内周面に軌道面を有し、ハウジングに固定される外輪と、内輪の軌道面及び外輪の軌道面に転動自在に配置される複数の転動体と、複数の転動体を円周方向に亘って等間隔に保持する保持器とを備えるスラスト軸受において、
少なくとも前記内輪が高清浄度鋼製で、かつ、特殊熱処理が施されていることを特徴とするスラスト軸受。
（２）前記高清浄度鋼は、酸素含有量が６ｐｐｍ以下で、介在物の粒径が３０μｍ以下であることを特徴とする上記（１）記載のスラスト軸受。
（３）前記高清浄度鋼は、浸炭処理、窒化処理、浸炭窒化処理の何れか一つの熱処理が施されていることを特徴とする上記（１）または（２）記載のスラスト軸受。
（４）前記内輪のみ、または前記内輪と前記外輪との両方が、高清浄度鋼製で、かつ、熱処理が施されていることを特徴とする上記（１）〜（３）の何れか１項に記載のスラスト軸受。
（５）前記内輪は前記外輪よりも肉厚であることを特徴とする上記（１）〜（４）の何れか１項に記載のスラスト軸受。
（６）油圧式無段変速機、油圧ポンプまたは油圧モータに使用されることを特徴とする上記（１）〜（５）の何れか１項に記載のスラスト軸受。 In order to achieve the above object, the present invention provides the following thrust bearing.
(1) A raceway surface on the outer peripheral surface, a rotatable inner ring, a raceway surface on the inner peripheral surface, an outer ring fixed to the housing, and the inner ring raceway surface and the outer ring raceway surface. In a thrust bearing comprising a plurality of rolling elements arranged and a cage that holds the plurality of rolling elements at equal intervals over the circumferential direction,
A thrust bearing, wherein at least the inner ring is made of high cleanliness steel and is subjected to special heat treatment.
(2) The thrust bearing according to (1), wherein the high cleanliness steel has an oxygen content of 6 ppm or less and an inclusion particle size of 30 μm or less.
(3) The thrust bearing according to (1) or (2), wherein the high cleanliness steel is subjected to any one of heat treatment of carburizing, nitriding, and carbonitriding.
(4) Any one of the above (1) to (3), wherein only the inner ring or both the inner ring and the outer ring are made of high cleanliness steel and are heat-treated. The thrust bearing according to item.
(5) The thrust bearing according to any one of (1) to (4), wherein the inner ring is thicker than the outer ring.
(6) The thrust bearing according to any one of (1) to (5), wherein the thrust bearing is used in a hydraulic continuously variable transmission, a hydraulic pump, or a hydraulic motor.

Claims

A raceway surface is provided on the outer circumferential surface, a rotatable inner ring, a raceway surface on the inner circumference surface, an outer ring fixed to the housing, a raceway surface of the inner ring, and a raceway surface of the outer ring are arranged to be rotatable. In a thrust bearing comprising a plurality of rolling elements and a cage that holds the plurality of rolling elements at equal intervals over the circumferential direction,
A thrust bearing, wherein at least the inner ring is made of high cleanliness steel and is subjected to special heat treatment.

The thrust bearing according to claim 1, wherein the high cleanliness steel has an oxygen content of 6 ppm or less and an inclusion particle size of 30 μm or less.

The thrust bearing according to claim 1 or 2, wherein the high cleanliness steel is subjected to any one of a heat treatment of a carburizing process, a nitriding process, and a carbonitriding process.

The thrust bearing according to any one of claims 1 to 3, wherein only the inner ring or both the inner ring and the outer ring are made of high cleanliness steel and are heat-treated. .

The thrust bearing according to any one of claims 1 to 4, wherein the inner ring is thicker than the outer ring.

The thrust bearing according to any one of claims 1 to 5, wherein the thrust bearing is used in a hydraulic continuously variable transmission, a hydraulic pump, or a hydraulic motor.