Bearings – Linear bearing – Recirculating
Patent
1998-05-22
2000-03-28
Footland, Lenard A.
Bearings
Linear bearing
Recirculating
F16C 2906
Patent
active
060422688
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a linear roller guide device using rollers as rolling elements, and more particularly, to a linear roller guide device in which rigidity of a movable block is highly improved.
BACKGROUND ART
As a conventional linear roller guide device of this type, for example, a guide device shown in FIG. 15 is well known.
Namely, this linear roller guide device has a structure in which a movable block 102 is movably guided along a track rail 100 through a number of rollers 101 disposed to right and left portions of the track rail 100. Two rows of the rollers 101 are disposed to each of the right and left portions of the track rail 100 in vertical direction. As a result, four rows of rollers 101 in total are disposed to the track rail 100. Further, four rows of roller rolling surfaces 103 for rolling the four rows of rollers 101 are formed to the track rail 100 in an entire range in which the movable block 102 is moved.
On the other hand, the movable block 102 is provided with four rows of roller rolling surfaces 104 for clamping the rollers 101 so as to oppose to the roller rolling surfaces 103 formed to the track rail 100. The movable block 102 is also provided with four rows of roller circulating passages 105 in unloaded region for circulating the rollers 101 clamped between the roller rolling surfaces 103;104 from one ends to the other ends of the roller rolling surface 103 of the movable block 102.
These four rows of the rollers 101 are disposed in a form of four rows in total so that a pair of rows of rollers disposed vertically are arranged along each of right and left side surfaces of the track rail 100. These four rows of the rollers 101 have a contacting structure in which a contact angle line S constituted by a line orthogonal to center axes of the rollers 101 disposed in upper two rows is set so as to downwardly incline towards the track rail 100 with an inclination angle of almost 45 with respect to a horizontal line H, while a contact angle line S constituted by a line orthogonal to center axes of the rollers 101 disposed in a pair of lower two rows is set so as to upwardly incline towards the track rail 100 with an inclination angle of almost 45.degree. with respect to a horizontal line H, thus adopting a contacting structure in which the loads applied from every four directions are equally supported by the rollers.
In the linear roller guide device described above, however, there was posed a problem that a high rigidity property inherent in the roller 101 cannot be utilized.
In the case of this linear roller guide device, if deformations to be caused by pre-load or external loads applied to the movable block are not eliminated, a contacting state of the rollers 101 with respect to the roller rolling surfaces 103 and 104 are changed, so that a preferable result excellent in rigid performance cannot be obtained.
Namely, conventionally, the paired upper and lower rows of rollers 101 are arranged along the right and left side surfaces of the track rail 100 so as to be apart from each other in a vertical direction, so that a length L from a base portion of a supporting leg portion 106 of the movable block 102 to the lower roller 101 is made long. As a result, when the preload is applied to the roller 101 or when a load in a horizontal direction is applied to an upper surface of the movable block 102 from the right or left direction as an external load, a moment applied in a direction spreading the supporting leg portion 106 is disadvantageously increased.
Further, when a lifting load (i.e., a load applied in a direction detaching the movable block 102 from the track rail 100) is applied as the external load, a force directing upward is applied to upper surfaces of both right and left end portions of the movable block 102 through screw holes 109 formed at upper surfaces of both right and left end portions of the movable block 102. As a reaction of the upward force, a force directing downward is applied to the roller rolling surfaces 104 of the lower side of t
Footland Lenard A.
THK Co. Ltd.
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