JPH03234403A - Method and device for changing pre-load - Google Patents

Method and device for changing pre-load

Info

Publication number
JPH03234403A
JPH03234403A JP20322290A JP20322290A JPH03234403A JP H03234403 A JPH03234403 A JP H03234403A JP 20322290 A JP20322290 A JP 20322290A JP 20322290 A JP20322290 A JP 20322290A JP H03234403 A JPH03234403 A JP H03234403A
Authority
JP
Japan
Prior art keywords
load
arrow
protruding part
spacer
bearing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP20322290A
Other languages
Japanese (ja)
Inventor
Takemichi Tsugai
Sumiaki Inami
Shoji Momoi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yamazaki Mazak Corp
Original Assignee
Yamazaki Mazak Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP9198889 external-priority
Application filed by Yamazaki Mazak Corp filed Critical Yamazaki Mazak Corp
Publication of JPH03234403A publication Critical patent/JPH03234403A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To change between a constant position pre-load and a constant pressure pre-load securely and easily by engaging a first and a second rigid, members rigidly for the constant position pre-load, and releasing the rigid engagement and pressing a bearing toward a main shaft axis by a resilient member for the constant pressure pre-load.
CONSTITUTION: For rotating a main shaft 3 at a low speed, a piston 26 is moved by an oil pressure cylinder 25 to rotate an operation shaft 23 through an engagement pin 23b in the direction of an arrow E, so a rotation spacer 22 is rotated in the direction of an arrow A through an operation groove 22d. A protruding part 22a is then applied to a protruding part 21a of a fixed spacer 21 to be restrained by contact or rigid members with each other for a distance from an outer race 5b of a bearing 5 to an outer race 9b of a bearing 9. In case of high speed rotation, the piston 26 is moved to rotate the operation shaft 23 in the direction of an arrow F through the engagement pin 23b, so the rotation spacer 22 is rotated in the direction of an arrow B to change the application of the protruding part 22a from that with the protruding part 21a of the fixed spacer 21 to that for moving a protruding member 21d of the fixed spacer 21 in the direction of an arrow C against the resiliency of a spring 21e, so a thrust force is applied to the bearings 5, 6, 7, 9 to make a constant pressure pre-load condition, thereby seizure is prevented.
COPYRIGHT: (C)1991,JPO&Japio
JP20322290A 1989-08-04 1990-07-31 Method and device for changing pre-load Pending JPH03234403A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9198889 1989-08-04

Publications (1)

Publication Number Publication Date
JPH03234403A true JPH03234403A (en) 1991-10-18

Family

ID=14041845

Family Applications (1)

Application Number Title Priority Date Filing Date
JP20322290A Pending JPH03234403A (en) 1989-08-04 1990-07-31 Method and device for changing pre-load

Country Status (1)

Country Link
JP (1) JPH03234403A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011104743A (en) * 2009-11-19 2011-06-02 Sodick Co Ltd Spindle device
JP2011251385A (en) * 2010-06-03 2011-12-15 Nsk Ltd Pre-load variable spindle
JP2014122673A (en) * 2012-12-21 2014-07-03 Ntn Corp Electric linear actuator

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011104743A (en) * 2009-11-19 2011-06-02 Sodick Co Ltd Spindle device
JP2011251385A (en) * 2010-06-03 2011-12-15 Nsk Ltd Pre-load variable spindle
JP2014122673A (en) * 2012-12-21 2014-07-03 Ntn Corp Electric linear actuator

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