Bearings – Linear bearing – Recirculating
Patent
1998-04-15
2000-04-04
Footland, Lenard A.
Bearings
Linear bearing
Recirculating
F16C 2906
Patent
active
06045265&
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a rolling motion guide apparatus in which a movable member is movably assembled to a track shaft through a rolling member, particularly to a structure for an inner periphery guide portion of a rolling member rolling direction changing passage which is integrally formed to a movable member body.
BACKGROUND ART
As an example of the conventional rolling motion guide apparatus of this type, the applicant had already proposed a rolling motion guide apparatus, as disclosed in Japanese Patent Laid-Open Publication No. HEI 7-317762, in which a circulating passage of the rolling member is integrally formed to the movable member body as a molding shaped portion composed of resin or the like.
That is, the movable member has a structure comprising: a movable member body having a loaded rolling member rolling portion corresponding a loaded rolling member rolling portion formed to the track shaft, and a rolling member return passage for returning a rolling member from one end of the loaded rolling member rolling portion to the other end thereof; and a direction changing passage member provided both end portions of the movable member body, the direction changing passage member constituting a rolling member rolling direction changing passage for scooping up the rolling member from the loaded rolling member rolling portion and then guiding the rolling member to the rolling member return passage.
Further, a rolling member retaining portion provided at a side peripheral portion of the loaded rolling member rolling portion, the inner periphery guide portion of the rolling member rolling direction changing passage and the rolling member return passage portion are integrally formed to the movable member body as a molding shaped portion composed of resin or the like (see Japanese Patent Laid-Open Publication No. HEI 7-317762).
However, in a case of the prior art technics described above, a boundary between the molding shaped portion and the movable member body consists of three boundary portions i.e., a boundary portion between both end surfaces of the movable member body and a shaped portion of the direction changing passage inner periphery guide portion, a boundary portion between the rolling member rolling portion and a shaped portion of the rolling member retaining portion formed at both side peripheral portion of the rolling member rolling portion, and a boundary portion between a side surface of the movable member opposing to a side surface to which rolling member rolling portion is formed and a shaped portion of a rolling member return bore. As a result, the three boundary portions are ranged over three side surfaces of the movable member.
When a clearance between the respective boundary portions between the movable member body and the molding shaped portion and a molding die supporting portion are not set to within a predetermined range, burrs will be disadvantageously formed from a molding material, so that it is required to take a countermeasure against the burrs. In this regard, the conventional movable member is inevitably required to take the countermeasure against the burrs with respect to the three side surfaces of the movable member. Accordingly, the molding die and the movable member were required to be precisely formed so that each of the three side surfaces thereof should have an accurate dimension.
The present invention was conceived for solving the aforementioned problems and an object of the present invention is to provide a rolling motion guide apparatus and a method of manufacturing a movable member for the apparatus enabling to enhance a working efficiency by sufficiently minimizing the boundary portion between the molding shaped portion and the movable member body.
DISCLOSURE OF THE INVENTION
In order to achieve the afore-mentioned object, the present invention provides a rolling motion guide apparatus comprising a track shaft and a movable member movably disposed to the track shaft through a number of rolling members, rolling member rolling portio
REFERENCES:
patent: 4128279 (1978-12-01), Ernst et al.
patent: 4659239 (1987-04-01), Teramachi
Hirokawa Tadashi
Shirai Takeki
Footland Lenard A.
THK Co. Ltd.
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