JPH0211220U

JPH0211220U -

Info

Publication number: JPH0211220U
Application number: JP8885188U
Authority: JP
Priority date: 1988-07-04
Filing date: 1988-07-04
Publication date: 1990-01-24

Description

[Brief explanation of drawings]

第１図は本考案の実施例に係る予圧調整装置を
適用した軸受ユニツトの縦断正面図である。１……軸受箱、１ａ……軸受部、２……主軸、
３……間座、７……軸受、１０……圧電素子、１
１……熱電対（温度検出手段）、１２……温度比
較手段、１３……軸受基準温度記憶手段、１４…
…寸法変位量演算手段、１５……温度一寸法変位
量換算データ記憶手段、１６……電圧演算手段、
Ａ……予圧調整装置。 FIG. 1 is a longitudinal sectional front view of a bearing unit to which a preload adjustment device according to an embodiment of the present invention is applied. 1...Bearing box, 1a...Bearing part, 2...Main shaft,
3... Spacer, 7... Bearing, 10... Piezoelectric element, 1
1...Thermocouple (temperature detection means), 12...Temperature comparison means, 13...Bearing reference temperature storage means, 14...
...Dimensional displacement calculation means, 15... Temperature-dimensional displacement conversion data storage means, 16... Voltage calculation means,
A... Preload adjustment device.

Claims

[Scope of utility model registration request]

A device for adjusting the preload of a pair of bearings that are arranged at a predetermined distance in the axial direction with a preload applied to the bearing box by a spacer and rotatably supports the shaft, A piezoelectric element is provided integrally and expands and contracts in the axial direction according to temperature changes to change the length of the spacer in the axial direction, and a piezoelectric element is provided in the bearing part of the bearing box to adjust the temperature of the bearing. a temperature detecting means for detecting; a bearing reference temperature storing means storing a preset reference temperature of the bearing during shaft operation; and a bearing reference temperature storing means storing the bearing temperature detected by the temperature detecting means and the bearing reference temperature storing means. temperature comparison means for determining the temperature difference by comparing the temperature with a reference temperature, and temperature-to-dimensional displacement conversion data storage means for storing data on dimensional displacement in the axial direction corresponding to temperature changes of the bearing and spacer. and dimensional displacement calculation means for calculating the dimensional displacement of the bearing and the spacer in the axial direction with respect to the temperature difference determined by the temperature comparison means based on the data stored in the temperature-dimensional displacement conversion data storage means; Voltage calculating means for calculating a voltage so as to displace the piezoelectric element by the same amount of dimensional displacement in a direction opposite to the direction of displacement of the bearing and spacer based on the amount of dimensional displacement calculated by the dimensional displacement calculating means. A bearing preload adjustment device characterized by: