JP2003176830A5

JP2003176830A5 -

Info

Publication number: JP2003176830A5
Application number: JP2001378629A
Authority: JP
Filing date: 2001-12-12
Publication date: 2004-12-16

Description

【０００８】
【課題を解決するための手段】
本発明の目的は、下記構成により達成される。
（１）外輪及び内輪間に複数の転動体を有し、前記外輪に補給孔が設けられた転がり軸受にグリースを補給するリース補給装置であって、監視装置により前記転がり軸受の潤滑状態を監視しながら、前記補給孔を介してグリースを補給することを特徴とするグリース補給装置。
（２）一回のグリース補給量が前記転がり軸受の軸受空間容積の０．１〜４％となるようにグリースを補給する前記（１）に記載のグリース補給装置。
（３）接触角を有し、前記転動体が玉であって、前記外輪の内径面の、軌道面の接触部のある側からずれた箇所に前記補給孔が開口している転がり軸受にグリースを補給する前記（１）又は（２）に記載のグリース補給装置。
（４）前記転動体が円筒ころである転がり軸受にグリースを補給する前記（１）又は（２）に記載のグリース補給装置。
（５）前記複数の転動体がセラミック製である転がり軸受にグリースを補給する前記（１）〜（４）のいずれかに記載のグリース補給装置。
（６）前記監視装置が、前記転がり軸受の金属製の外輪若しくはこの外輪と電気的に導通している部材と、前記転がり軸受の金属製の内輪若しくはこの内輪と電気的に導通している部材との間の電気的特性値を監視し、この電気的特性値が所定範囲から外れた場合に潤滑状態が不良であるとする、前記（１）〜（４）のいずれかに記載のグリース補給装置。
（７）前記複数の転動体が金属製であり、前記電気的特性値が抵抗値若しくはこの抵抗値に基づいて変化する電位差であり、この抵抗値若しくは電位差が所定値を下回った場合に潤滑状態が不良であるとする、前記（６）に記載のグリース補給装置。
（８）前記複数の転動体がセラミック製であり、それら転動体が合成樹脂製の保持器に転動自在に保持されており、前記電気的特性値が電位差であり、この電位差が所定値を越えた場合に潤滑状態が不良であるとする、前記（６）に記載のグリース補給装置。
（９）前記複数の転動体がセラミック製であり、それら転動体のうちの少なくとも１個が導電性セラミック製であり、前記電気的特性値が抵抗値若しくはこの抵抗値に基づいて変化する電位差であり、この抵抗値若しくは電位差が所定範囲から外れた場合に潤滑状態が不良であるとする、前記（６）に記載のグリース補給装置。
（１０）前記（１）〜（９）のいずれかに記載のグリース補給装置によってグリースを補給される転がり軸受を用いた軸受装置。
（１１）前記（１）〜（９）のいずれかに記載のグリース補給装置によってグリースを補給される転がり軸受によって工作機械の主軸用スピンドルを支持したスピンドル装置。
（１２）前記（１）〜（９）のいずれかに記載のグリース補給装置によってグリースを補給される転がり軸受によってモータ用スピンドルを支持したスピンドル装置。
なお、軸受空間容積とは、外輪内径と内輪外径との間にできる空間から、転動体の体積及び保持器の体積を差し引いた容積を意味する。[0008]
[Means for Solving the Problems]
The object of the present invention is achieved by the following constitution.
(1) A lease replenishing device having a plurality of rolling elements between an outer ring and an inner ring and supplying grease to a rolling bearing provided with a replenishing hole in the outer ring, wherein a monitoring device monitors the lubricating state of the rolling bearing Grease replenishing device characterized in that the grease is replenished through the replenishing hole.
(2) The grease replenishing device according to (1), wherein the grease is replenished such that the amount of grease replenished at one time is 0.1 to 4% of the bearing space volume of the rolling bearing.
(3) Grease for a rolling bearing having a contact angle, the rolling element being a ball, and the supply hole being open at a position shifted from the side with the contact portion of the raceway on the inner diameter surface of the outer ring The grease replenishing device according to (1) or (2), which replenishes
(4) The grease replenishing device according to (1) or (2), wherein the rolling bearing in which the rolling elements are cylindrical rollers is replenished with grease.
(5) The grease replenishing device according to any one of (1) to (4), wherein the rolling bearing in which the plurality of rolling elements are ceramic is replenished with grease.
(6) The monitoring device includes a metal outer ring of the rolling bearing or a member electrically connected to the outer ring, and a metal inner ring of the rolling bearing or a member electrically connected to the inner ring The grease supply according to any one of the above (1) to (4), wherein when the electrical property value is out of a predetermined range, the lubrication condition is determined to be defective. apparatus.
(7) The plurality of rolling elements are made of metal, and the electrical characteristic value is a resistance value or a potential difference that changes based on the resistance value, and the lubrication state is obtained when the resistance value or the potential difference falls below a predetermined value. The grease replenishing device according to (6), in which
(8) The plurality of rolling elements are made of ceramic, and the rolling elements are rotatably held by a synthetic resin cage. The electric characteristic value is a potential difference, and the potential difference is a predetermined value. The grease replenishing device according to the above (6), wherein the lubrication condition is considered to be defective when it is exceeded.
(9) The plurality of rolling elements are made of ceramic, and at least one of the rolling elements is made of conductive ceramic, and the electric characteristic value is a resistance value or a potential difference that changes based on the resistance value. The grease replenishing device according to (6), wherein the lubrication condition is determined to be defective when the resistance value or the potential difference is out of a predetermined range.
(10) A bearing device using a rolling bearing which is replenished with grease by the grease replenishing device according to any one of (1) to (9).
(11) A spindle device in which a spindle for a spindle for a machine tool is supported by rolling bearings supplied with grease by the grease supply device according to any one of (1) to (9).
(12) A spindle device in which a motor spindle is supported by a rolling bearing supplied with grease by the grease supply device according to any one of (1) to (9).
In addition, bearing space volume means the volume which deducted the volume of a rolling element, and the volume of a holder | retainer from the space which can be between an outer ring | wheel inner-diameter and an inner ring | wheel outer diameter.

Claims

A grease replenishing device for replenishing grease to a rolling bearing having a plurality of rolling elements between an outer ring and an inner ring, wherein the outer ring is provided with a replenishing hole,
A grease replenishing device characterized in that grease is replenished through the replenishing hole while monitoring the lubrication state of the rolling bearing by a monitoring device.

The grease replenishing device according to claim 1, wherein the grease is replenished such that the amount of grease replenished once is 0.1 to 4% of the bearing space volume of the rolling bearing.

Grease is supplied to a rolling bearing having a contact angle, the rolling element being a ball, and the supply hole being open at a position shifted from the side where the contact portion of the raceway is on the inner diameter surface of the outer ring The grease replenishing device according to claim 1 or 2.

The grease replenishing device according to claim 1 or 2, wherein the rolling bearing in which the rolling elements are cylindrical rollers is replenished with grease.

The grease replenishing device according to any one of claims 1 to 4, wherein the rolling bearings of which the plurality of rolling elements are made of ceramic are replenished with grease.

Between the metallic outer ring of the rolling bearing or a member electrically connected to the outer ring and the metallic inner ring of the rolling bearing or a member electrically connected to the inner ring of the rolling bearing The grease supply device according to any one of claims 1 to 4, wherein the electrical characteristic value of is monitored, and when the electrical characteristic value is out of a predetermined range, the lubrication condition is considered to be defective.

The plurality of rolling elements are made of metal, and the electric characteristic value is a resistance value or a potential difference that changes based on the resistance value, and when the resistance value or the potential difference falls below a predetermined value, the lubrication state is defective. The grease replenishing device according to claim 6, which is assumed to be present.

When the plurality of rolling elements are made of ceramic, and the rolling elements are rotatably held by a synthetic resin cage, the electric characteristic value is a potential difference, and the potential difference exceeds a predetermined value. The grease replenishing device according to claim 6, wherein the lubrication condition is bad.

The plurality of rolling elements are made of ceramic, and at least one of the rolling elements is made of conductive ceramic, and the electric characteristic value is a resistance value or a potential difference that changes based on the resistance value. 7. The grease replenishing device according to claim 6, wherein the lubrication condition is determined to be defective when the resistance value or the potential difference deviates from the predetermined range.

The bearing apparatus using the rolling bearing replenished with grease by the grease replenishment apparatus in any one of Claims 1-9.

A spindle device supporting a spindle for a spindle of a machine tool by a rolling bearing supplied with grease by the grease replenishing device according to any one of claims 1 to 9.

A spindle device supporting a spindle for a motor by a rolling bearing supplied with grease by the grease supply device according to any one of claims 1 to 9.