JP2013108608A - Linear motion rolling guide unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a linear motion rolling unit which achieves lubrication maintenance-free by making a spacer, which forms an end cap, with a porous molded body impregnated with lubricant to surely and stably feed a lubricant to balls, which roll on a turnaround path, from the porous molded body of the spacer.SOLUTION: The spacer 6 made of the porous molded body is arranged in a recessed part 16 of an end cap body 5. The spacer 6 consists of a storage part 31, linkage parts integrally constructed on both sides of the storage part 31, and lead-out parts integrated with the linkage parts and forming inner peripheral parts 29 of the turnaround path. When the balls roll on the turnaround path, the balls come into contact with the lead-out part of the porous molded body 7, and the lubricant impregnated the porous molded body is fed to the balls.

Description

  The present invention relates to a linear motion rolling guide unit composed of a slider that relatively moves on a long track rail via balls, which are a plurality of rolling elements.

  In recent years, application of linear motion rolling guide units to sliding parts of various machine devices such as semiconductor manufacturing devices, machine tools, various assembly devices, and transport machines has been expanding. In the conventional roller type linear motion rolling guide unit, a lubricating member is arranged in the end caps at both ends in the sliding direction of the slider, and lubricant is supplied from the lubricating member to the rolling elements in the direction changing path of the end cap. Lubrication maintenance free.

  As a linear motion guide unit according to the present applicant, lubrication of the rolling elements is performed on the direction change path, the structure of the lubrication means is simplified, and the lubricant is reliably and stably lubricated to the rolling elements for maintenance. Those who have achieved free are known. In the linear motion guide unit, a porous molded body impregnated with a lubricant is disposed in a recess formed on an end face of the end cap on the casing side, and an opening communicating with the direction change path is formed in the recess. The projecting part of the porous molded body is exposed to the direction changing path from the opening, and the roller rolling on the direction changing path is brought into contact with the exposed surface of the projecting part and lubricated with the lubricant (for example, Patent Document 1).

  2. Description of the Related Art Conventionally, a lubrication linear guide device is known in which a lubricant-containing polymer is provided on a rolling element return path or a curved path to supply oil to the rolling element. The lubrication linear guide device is formed by inserting a rolling element circulation tube composed of a lubricant-containing polymer member made of a reinforcing material such as polyethylene and a lubricant-containing polymer into a rolling element return passage of a slider body. The return guide that forms the inner wall that is part of the curved path that forms the rolling element circulation path is joined to the reinforcing material and the lubricant-containing polymer without peeling, improving the strength of the lubricant-containing polymer member The lubricant-containing polymer member is fitted into a semi-cylindrical groove on the back side of the end cap (see, for example, Patent Document 2).

JP 2011-149469 A Japanese Patent Laid-Open No. 10-78032

  By the way, in the conventional linear motion rolling guide unit, there is a demand for lubrication maintenance-free that can supply the lubricant to the rolling elements over a long period of time. However, the miniature type linear motion rolling guide unit has a very small external dimension, and there is not enough room to form a lubricating member that can supply lubricant to the rolling elements over a long period of time and realize lubrication maintenance-free. Is the current situation. If the linear motion rolling guide unit is implemented with a structure having a conventional sleeve-like lubrication member, the lubrication member is extremely thin and has a small volume, and the amount of lubricant retained on the lubrication member is reduced. , There is a risk of poor lubrication such as seizure due to insufficient lubrication of the rolling elements. In addition, in order to sufficiently supply the lubricant to the rolling elements, it is necessary to make a large hole for the return path formed in the casing provided with the lubricating member, which may reduce the rigidity of the casing itself. At the same time, there arises a problem that the periphery of the return path through hole becomes extremely thin.

  For example, in the roller type linear motion rolling guide unit described above, a porous molded body impregnated with a lubricant is fitted to an end cap that constitutes the direction changing path, and the protruding portion of the porous molded body is exposed to the direction changing path. In this structure, the lubricant is supplied to the roller from the inner peripheral side. However, the structure is complicated, and there is a problem that it becomes unsuitable for a miniature type linear motion rolling guide unit. Further, the lubrication linear guide device has a problem that if the proportion of the reinforcing material is increased with respect to the lubricant-containing polymer, the oil content of the lubricant is not sufficient in order to increase the strength of the lubricant-containing polymer member. In other words, the lubricant-containing polymer is formed by mixing a polyolefin polymer and a lubricant such as poly-alpha olefin oil, heating and melting, and then injecting into a predetermined mold and cooling and solidifying while pressing. In the polymer containing lubricant, the resin itself absorbs the lubricant and swells, but when the lubricant is discharged, it shrinks and deforms, and as a result, the lubricant-containing polymer part shrinks rather than the reinforcement part. As a result, there is a problem that the lubricant cannot be supplied to the rolling elements.

  Therefore, the present applicant has attempted to construct a structure suitable for the ball type from the structure in which the lubricating member is arranged in the end cap, which is implemented in the roller type, and in addition, the ball type small size product, In other words, a miniature type linear motion rolling guide unit with a track rail width dimension of 3 mm or less or a rolling element ball diameter of 1 mm or less has been developed, and the linear motion rolling guide unit has a longer lubricant. Supplying over a period, it was possible to realize lubrication maintenance-free.

  An object of the present invention is to solve the above-mentioned problems, and is particularly suitable for a ball type miniature type in which a conventional maintenance-free structure cannot be adopted, and is formed on a spacer that constitutes end caps at both ends in a slider sliding direction. The wall of the direction change path is directly composed of a porous molded body impregnated with a lubricant. When the ball rolls in the direction change path, the ball smoothly rolls along the direction change path. It is to provide a linear motion rolling guide unit that can reliably lubricate and supply lubricant to rolling elements over a long period of time to realize a maintenance-free lubrication.

The present invention has a track rail in which first track grooves are formed along both side surfaces in the longitudinal direction, and a slider slidable in the longitudinal direction across the track rail. A casing in which a second track groove is formed opposite to the track groove and a return path extending along a pair of track paths formed between the second track groove and the first track groove is formed. An end cap attached to each end surface of the casing and formed with a direction change path that extends and communicates with the arc path and the return path, and the track path, the return path, and the pair of direction change paths In a linear motion rolling guide unit comprising a ball consisting of a plurality of rolling elements rolling on a circulation path composed of
The end cap is fitted into an end cap body that forms an outer peripheral portion of the direction changing path, and a concave portion that is open on the casing side of the end cap body to form an inner peripheral portion of the direction changing path and is lubricated. A spacer formed of a porous molded body impregnated with an agent, and when the ball rolls in contact with the wall surface of the inner peripheral portion of the direction change path of the spacer, The present invention relates to a linear motion rolling guide unit in which the impregnated lubricant is supplied to the ball.

  In addition, the spacer is integrally formed on a body part that forms a storage part that fits into the recess of the end cap body and fits within a thickness range of the end cap body, and on both sides of the body part. And a sleeving part constituting the linkage part, and a lead-out part formed integrally with the linkage part and forming the wall surface of the inner peripheral part of the direction change path. Further, the main body portion of the spacer is formed substantially in a rectangular parallelepiped shape, and is formed to be more than three times as thick as the sleeve portion in the slider moving direction than the sleeve portion of the spacer. It protrudes to the side and fits into the recess.

  The outer shape of the connecting portion between the main body portion and the sleeve portion of the spacer is formed in a mounting groove recessed in an arc shape, and the end cap and the end are formed in the mounting groove. A connecting member for fixing an end surface pressing plate disposed on the end surface of the cap to the casing is located. Furthermore, both ends of the wall surface of the inner peripheral portion of the direction change path formed in the sleeve portion of the spacer are formed in an arcuate concave shape so as to communicate with the return path and the second track groove, respectively. doing.

  Further, the flat portion formed at the sleeve end portion of the spacer is formed with a positioning notch for fitting a convex portion formed inside the sleeve end portion of the end cap body. Yes. Furthermore, a plurality of convex portions projecting in the slider sliding direction are formed on at least the front surface of the end cap main body side of the porous molded body constituting the spacer, and the convex portion is configured so that the spacer is the end. The cap body is deformed by being fitted in the concave portion of the cap body and being fixed to the casing, thereby preventing the porous molded body from being lifted or rattling with respect to the end cap body. The porous molded body of the spacer disposed in the recess of the end cap body is exposed to the track rail at a portion facing at least the upper surface of the track rail.

  Further, the linear motion rolling guide unit has a diameter of the ball of 1.0 mm or less, a width of the track rail having a substantially rectangular cross section, a width of 6 mm or less, and a total height of the slider and the track rail of 4 mm. It is configured as a miniature type that is 5 mm or less.

  Further, the porous molded body constituting the spacer is made of polyethylene or polypropylene with ultra high molecular weight synthetic resin fine particles. Further, the porous molded body constituting the spacer is heat-molded by pressing the synthetic resin fine particles, and the synthetic resin fine particles are held in a porous portion in communication with each other. Is impregnated with the lubricant.

  Since this linear motion rolling guide unit is configured as described above, the wall surface of the spacer forming the inner peripheral portion of the direction changing path formed in the end cap is directly configured with a lubricant-impregnated porous molded body. As a result, the number of parts can be reduced and the structure of the end cap can be simplified. Further, since the spacer is formed of a porous molded body containing a lubricant, when the ball rolls on the direction change path, the lubricant is applied to the ball from any position on the inner peripheral side wall surface of the direction change path. Lubrication maintenance-free operation can be realized without increasing the number of parts without the need for a separate lubrication member. In the direction change path of the end cap, the ball is subjected to centrifugal force due to inertial force by changing the rolling direction from the straight path of the track path or return path to the circular path of the direction change path. The centrifugal force generated on the ball rolling on the direction change path and the impact force on the wall of the direction change path due to the thrust in the traveling direction of the ball are, on the shape of the direction change path, the outer peripheral portion of the direction change path of the end cap body. Although it is loaded on the inner side, it is hardly loaded on the inner peripheral side of the spacer. Therefore, even if the spacer is made of a porous molded body impregnated with a lubricant, the spacer is hardly damaged, there is no problem in strength, and the spacer has no hole for penetrating other parts. , There are few factors that reduce the strength of the spacer parts, there are no problems in strength, and durability can be maintained.

  In addition, since the main body part fitted into the recess of the end cap main body is formed to be more than three times thicker than the sleeve part and has a large volume, the spacer has a large amount of lubricant in the storage part constituted by the main body part. Impregnation can be held. At the end of the spacer sleeve, there is a positioning notch near the inner peripheral wall of the direction change path. The position of the inner peripheral wall surface is accurately positioned, and the direction change path is accurately formed. Furthermore, the balls rolling in the direction change path are smoothly guided and rolled smoothly, and contact the inner peripheral wall surface to supply an appropriate amount of lubricant at all times, thereby realizing lubrication maintenance-free. In addition, this linear motion rolling guide unit is able to lubricate the ball smoothly by rolling the ball in the direction change path, so it is especially compatible with the miniature type linear motion rolling guide unit that has no dimensional margin in the casing cross section. ¡Lubrication maintenance-free is possible for a long time, and it is not necessary to enlarge the hole diameter of the return path in order to add lubrication parts unlike the conventional structure, so that the rigidity of the slider against external load can be maintained.

It is a partially broken perspective view which shows one Example of the linear motion rolling guide unit by this invention. It is a disassembled perspective view which shows the linear motion rolling guide unit of FIG. It is a perspective view which shows the spacer which comprises the end cap in the linear motion rolling guide unit of FIG. FIG. 4 is a front view showing the spacer of FIG. 3 as viewed from the end cap body side. It is a side view which shows the spacer of FIG. FIG. 2 is a perspective view showing an end cap body constituting an end cap in the linear motion rolling guide unit of FIG. FIG. 7 is a front view showing the end cap body of FIG. 6 as viewed from the casing side. It is sectional drawing in the AA position of the end cap main body of FIG. It is sectional drawing in the BB position of the end cap main body of FIG. It is sectional drawing in CC position of the end cap main body of FIG. It is a side view which shows the linear motion rolling guide unit of FIG. It is sectional drawing in the DD position of the linear motion rolling guide unit of FIG. 11 is a cross-sectional view of the linear motion rolling guide unit at the EE position.

  Embodiments of a linear motion rolling guide unit according to the present invention will be described below with reference to the drawings. In the linear motion rolling guide unit according to the present invention, the track grooves 11 (first track grooves) are generally provided along the mounting holes 18 penetrating from the upper surface 42 to the lower surface for mounting on the base or the like and the both side surfaces 25 in the longitudinal direction. A slider that includes a formed track rail 1 and a track groove 12 (second track groove) that is formed to face the track groove 11 and that is relatively slidable via a rolling element in the longitudinal direction of the track rail 1. 2 has. In this linear motion rolling guide unit, the rolling element is a ball 10, and track grooves 11 and 12 formed in the track rail 1 and the slider 2 are formed in two rows. The slider 1 is mainly formed with a pair of return paths 20 extending along a track groove 12 (second track groove) and a pair of track paths 17 formed between the track grooves 11 and the track grooves 12. Are attached to both end faces 21 of the casing 3 and the casing 3, respectively, and the track path 17 and the return path 20 extend in an arc shape. A rolling element composed of a plurality of balls 10 rolling on a circulation path 40 constituted by an end cap 4 having a direction change path 15 communicating therewith and a track path 17, a return path 20 and a pair of direction change paths 15. (See FIG. 1).

  In this linear motion rolling guide unit, the casing 3 hangs down along the side face 25 of the track rail 1 from both sides of the main body portion 13 located on the upper surface 42 side of the track rail 1 and the width direction of the main body portion 13. 1 is composed of a pair of sleeve portions 14 straddling 1. The sleeve portion 14 of the casing 3 is formed with a raceway groove 12 along the longitudinal direction and a return path 20 that is a through hole. The end cap 4 includes an end cap body 5 (see FIG. 6) in which an outer peripheral portion 28 of the direction change path 15 is formed on the casing 3 side and a recess 16 opened on the casing 3 side, and the anti-casing 3 side. The inner periphery 29 of the direction change path 15 is formed on the end cap body 5 and the spacer 6 is fitted in the recess 16 formed in the end cap body 5 (see FIG. 3). Further, the end cap 4 is assembled by fitting a convex portion 33 (see FIG. 7) formed in the end cap body 5 into a notch 27 (see FIG. 4) formed in the spacer 6, thereby The direction change path 15 is formed by the outer peripheral portion 28 and the inner peripheral portion 29 being opposed and aligned (see FIG. 13).

  In this linear motion rolling guide unit, a plate-like end surface pressing plate 8 in which a mounting hole 37 is formed is disposed on the end surface 34 on the side opposite to the casing of the end cap body 5. By tightening the end surface pressing plate 8 at the end of the slider with the fixing screw 9, the end surface pressing plate 8 is pressed, and the spacer 6 is pressed into the recess 16 of the end cap body 5 to be fitted and fixed. The slider 2 includes a mounting hole 37 in which the fixing screw 9 is formed in the end face pressing plate 8, a mounting hole 22 formed in the end cap body 5, and a mounting groove that is recessed in an arc shape formed in the spacer 6. The spacer 6, the end cap main body 5, and the end face pressing plate 8 are fixed to the casing 3 by being inserted into the mounting screw hole 23 formed in the casing 3 by being inserted into the casing 41.

  In addition, the end cap body 5 is disposed so as to be opposed to the body portion 13 of the casing 3 and has a recess portion 16 in which the spacer 6 is fitted. It is comprised from the sleeve part 36 which opposes the sleeve part 14 of this. A wall surface of the outer peripheral portion 28, which is the outer peripheral side of the direction changing path 15 constituting the circulation path 40 of the ball 10, is formed on both sleeve portions 36 of the end cap body 5. The wall surface of the outer peripheral portion 28 of the direction changing path 15 is an arc-shaped path connecting the track path 17 and the return path 20, and the cross-sectional shape in a plane perpendicular to the ball rolling direction of the direction changing path 15 is the diameter dimension of the ball 10. It is formed in a substantially arcuate concave shape 44 with a larger diameter dimension. The spacer 6 includes a main body portion 38 disposed opposite to the main body portion 35 of the end cap body 5, and a sleeve hanging from both ends in the width direction of the main body portion 38 and opposed to the sleeve portion 36 of the end cap body 5. The unit 39 is configured. A wall surface of an inner peripheral portion 29 that is the inner peripheral side of the direction change path 15 is formed on the sleeve portion 39 of the spacer 6. The wall surface of the inner peripheral portion 29 of the direction change path 15 is an arc-shaped path connecting the track path 17 and the return path 20, and the cross-sectional shape in a plane perpendicular to the ball rolling direction of the direction change path 15 is the diameter of the ball 10. The diameter dimension is larger than the dimension and is substantially semicircular. That is, both ends of the wall surface of the inner peripheral portion 29 of the direction change path 15 formed in the sleeve portion 39 of the spacer 6 are formed into an arcuate concave shape 44 (see FIG. 4), and the return path 20 of the casing 3 Each communicates with the raceway groove 12.

  In particular, with reference to FIGS. 3 to 10, the characteristic configuration of the linear motion rolling guide unit will be described. In particular, this linear motion rolling guide unit is formed entirely of a porous molded body 7 in which the spacer 6 is impregnated with a lubricant, and the ball 10 is placed on the wall surface of the inner peripheral portion 29 of the direction change path 15 of the spacer 6. When rolling in contact, the lubricant impregnated in the porous molded body 7 is supplied to the balls 10. In addition, the spacer 6 is fitted into the concave portion 16 of the end cap body 5 so as to constitute a storage portion 31 that fits in a space formed as large as possible within the thickness range of the end cap body 5. The sleeve portion 39 forming the linkage portion 32 is formed integrally on both sides in the width direction of the main body portion 38, and the wall surface of the inner peripheral portion 29 of the direction changing path 15 is formed integrally with the linkage portion 32. It is comprised from the derivation | leading-out part 30 to form. Further, the main body portion 38 of the spacer 6 is formed in a substantially rectangular parallelepiped shape, and is formed to be more than three times as thick as the sleeve portion 39 in the slider moving direction than the sleeve portion 39 of the spacer 6 (see FIG. 5). Further, it protrudes toward the end cap body 5 and is fitted into the recess 16. In other words, the recess 16 formed in the end cap body 5 is formed to be greatly recessed to a size for fitting the body portion 38 of the spacer 6. Further, this linear motion rolling guide unit is a lubricant-impregnated porous molded body 7 that forms a spacer 6 incorporated in the recess 16 of the end cap body 5, unlike a sleeve-type porous molded body having a conventional structure. The structure can extend the volume of the porous molded body 7 in the slider sliding direction to increase the volume. If the porous molded body 7 can be made larger, the amount of lubricant impregnated in it can be increased. As a result, a long-term lubrication maintenance-free operation for the ball 10 can be realized. Specifically, the storage portion 31 of the main body portion 38 constituting the spacer 6 has a kind of block structure capable of storing a large amount of lubricant, and the storage portion 31 is three times as large as the linkage portion 32 of the sleeve portion 39. It is a main body portion 38 formed to a thickness (see FIG. 5), and the lead-out portion 30 is a wall surface of the inner peripheral portion 29 of the direction changing path 15 of the linkage portion 32 and has a function of leading out the impregnated lubricant. ing. In this linear motion rolling guide unit, when the ball 10 is in contact with or pressed against an arbitrary position on the wall surface of the inner peripheral portion 29 of the direction changing path 15, the lubricant in the storage portion 31 of the porous molded body 7 is pumped. It is led out to the inner peripheral part 29 of the direction change path 15 through the linkage part 32 and then the lead-out part 30.

  Further, in this linear motion rolling guide unit, the porous molded body 7 constituting the spacer 6 disposed in the recess 16 of the end cap body 5 is at least a portion facing the upper surface 42 of the track rail 1 with respect to the track rail 1. Exposed (see FIG. 1). Further, the outer shape of the connecting portion between the main body portion 38 and the sleeve portion 39 of the spacer 6 is formed in a mounting groove 41 that is recessed in an arc shape. The mounting groove 41 includes the end cap 4 and its end cap 4. A fixing screw 9 which is a connecting member for fixing the end surface pressing plate 8 disposed on the end surface 34 to the casing 3 is located. Furthermore, both ends of the wall surface of the inner peripheral portion 29 of the direction change path 15 formed in the sleeve portion 39 of the spacer 6 are formed in an arc-shaped cutout shape. Further, a positioning notch for fitting a convex portion 33 formed inside the end portion of the sleeve portion 36 of the end cap body 5 is fitted into the flat portion 43 formed at the end portion of the sleeve portion 39 of the spacer 6. A portion 27 is formed (see FIG. 4). Accordingly, the notch portion 27 of the spacer 6 is concavo-convexly engaged with the positioning convex portion 33 (see FIG. 7) of the end cap body 5 so that the wall surface position of the inner peripheral portion 29 of the spacer sleeve portion and the end cap body 5 Thus, the direction change path 15 is accurately formed without a step.

  A plurality of convex portions 26 projecting in the slider sliding direction are formed at least on the front surface of the porous molded body 7 constituting the spacer 6 on the end cap body 5 side (see FIG. 3). Specifically, the convex portion 26 formed on the porous molded body 7 is located at a position near the linkage portion 32 of the storage portion 31 and below the wall surface of the inner peripheral portion 29 of the direction change path 15 of the linkage portion 32. It is formed at symmetrical positions, and is formed at four places in total. The convex portion 26 formed in the porous molded body 7 is fitted into the concave portion 16 of the end cap body 5 by tightening the end face pressing plate 8 into the casing 3 with the fixing screw 9 with the end cap 4 interposed. Together, they are pressed and deformed, thereby fulfilling the function of preventing the porous molded body 7 from being lifted or rattling with respect to the end cap body 5. Two convex portions 26 are formed on the main body portion 38 and the sleeve portion 39 respectively so as to face the surface on the end cap main body 5 side, but the present invention is not limited to this, and is appropriate so that the posture is stable. A plurality of them can be provided.

  Further, this linear motion rolling guide unit is mainly configured such that the ball diameter is 1.0 mm or less and the width of the track rail 1 is 5 mm or less. In this embodiment, the rail width of the track rail 1 is as follows. If the track rail 1 has a rail height of 2.6 mm and the track rail 1 has a wide structure, the width of the track rail 1 is 3 mm. The dimensions are 6 mm or less, the height of the track rail 1 is 2.8 mm or less, and the total height of the slider 2 and the track rail 1 is 4.5 mm or less. The oil hole and grease nipple for supplying the agent are not provided, and it is configured to realize lubrication maintenance-free. That is, the linear motion rolling guide unit has a ball diameter of the ball 10 of 1.0 mm or less, a width of the track rail 1 having a substantially rectangular cross section is 6 mm or less, and a total height composed of the slider 2 and the track rail 1. It is preferable to constitute a miniature type of 4.5 mm or less. In this miniature size linear motion rolling guide unit, the width of the sleeve 14 of the casing 3 is less than three times the ball diameter, and the height of the sleeve 14 of the casing 3 is less than 2.2 times the ball diameter. Is formed.

  In this linear motion rolling guide unit, the porous molded body 7 constituting the spacer 6 is composed of ultrahigh molecular weight synthetic resin fine particles made of polyethylene or polypropylene. Further, the porous molded body 7 constituting the spacer 6 is formed by heat-molding synthetic resin fine particles, and the synthetic resin fine particles are held in a porous portion in a communication state, that is, in an open pore state. The part is impregnated with a lubricant. Therefore, the porous molded body 7 of the spacer 6 can achieve a good maintenance-free maintenance over a long period of time by properly leaching the impregnated lubricant and supplying oil to the balls 10.

  The linear motion rolling guide unit according to the present invention is incorporated in sliding parts of various devices such as semiconductor manufacturing equipment, precision machinery, measurement / inspection equipment, medical equipment, various robots, various assembling equipment, transfer machines, machine tools, micromachines, etc. It is preferable to use it.

DESCRIPTION OF SYMBOLS 1 Track rail 2 Slider 3 Casing 4 End cap 5 End cap main body 6 Spacer 7 Porous molded object 8 End surface holding plate 9 Fixing screw 10 Ball 11 Track groove (1st track groove)
12 Track groove (second track groove)
DESCRIPTION OF SYMBOLS 15 Direction change path 16 Recessed part 17 Track path 20 Return path 21,34 End face 25 Side face 26,33 Convex part 27 Notch part 28 Outer peripheral part of direction change path 29 Inner peripheral part of direction change path 30 Derivation part 31 Storage part 32 Cooperation Part 35, 38 Body part 36, 39 Sleeve part 40 Circulation path 41 Groove for mounting recessed in an arc shape 42 Upper surface 43 Plane part 44 Concave shape

Claims (11)

A track rail having first track grooves formed along both sides in the longitudinal direction and a slider slidable in the longitudinal direction across the track rail, the slider facing the first track groove A casing in which a second track groove is formed and a return path extending along a pair of track paths formed between the second track groove and the first track groove is formed, and both ends of the casing An end cap attached to each surface and formed with a direction changing path that extends in a circular arc and communicates with the track path and the return path, and includes the track path, the return path, and a pair of the direction changing paths. In a linear motion rolling guide unit comprising a ball consisting of a plurality of rolling elements rolling on a circulation path,
The end cap is fitted into an end cap body that forms an outer peripheral portion of the direction changing path, and a concave portion that is open on the casing side of the end cap body to form an inner peripheral portion of the direction changing path and is lubricated. A spacer formed of a porous molded body impregnated with an agent, and when the ball rolls in contact with the wall surface of the inner peripheral portion of the direction change path of the spacer, A linear motion rolling guide unit wherein the impregnated lubricant is supplied to the ball.   The spacer is formed in a unitary structure on each side of the main body and a main body constituting a storage portion that fits into the recess of the end cap main body and fits within the thickness range of the end cap main body. 2. The sleeve according to claim 1, further comprising: a sleeve portion constituting a linkage portion; and a lead-out portion formed integrally with the linkage portion to form the wall surface of the inner peripheral portion of the direction change path. The linear motion rolling guide unit described.   The main body of the spacer is formed in a substantially rectangular parallelepiped shape, and is formed in the slider moving direction to be more than three times as thick as the sleeve in the slider moving direction, and on the end cap main body side. The linear motion rolling guide unit according to claim 1, wherein the linear motion rolling guide unit is protruded and fitted into the concave portion.   The outer shape of the connection portion between the main body portion and the sleeve portion of the spacer is formed in a mounting groove recessed in an arc shape, and the mounting groove includes the end cap and the end cap. The linear motion rolling guide unit according to any one of claims 1 to 3, wherein a connecting member for fixing an end surface pressing plate disposed on the end surface to the casing is located.   Both ends of the wall surface of the inner peripheral portion of the direction change path formed in the sleeve portion of the spacer are formed in an arcuate concave shape and communicate with the return path and the second track groove, respectively. The linear motion rolling guide unit according to any one of claims 1 to 4, wherein the linear motion rolling guide unit is provided.   The flat portion formed at the sleeve end portion of the spacer is formed with a positioning notch for fitting a convex portion formed inside the sleeve end portion of the end cap body. The linear motion rolling guide unit according to any one of claims 2 to 5.   A plurality of convex portions projecting in a slider sliding direction are formed at least on the front surface of the porous molded body constituting the spacer on the side of the end cap main body, and the convex portion is configured so that the spacer is the end cap main body. 7. The structure according to claim 1, wherein the porous molded body is deformed by being fitted into the recess and being fixed to the casing to prevent the porous molded body from being lifted or rattled with respect to the end cap body. The linear motion rolling guide unit according to claim 1.   The porous molded body of the spacer disposed in the recess of the end cap body is exposed to the track rail at a portion facing at least the upper surface of the track rail. The linear motion rolling guide unit according to any one of? 7.   The ball diameter is 1.0 mm or less, the width of the track rail having a substantially rectangular cross section is 6 mm or less, and the total height of the slider and the track rail is 4.5 mm or less. The linear motion rolling guide unit according to claim 1, wherein the linear motion rolling guide unit is provided.   The linear motion rolling guide according to any one of claims 1 to 9, wherein the porous molded body constituting the spacer is made of polyethylene or polypropylene with ultra high molecular weight synthetic resin fine particles. unit.   The porous molded body constituting the spacer is heat-molded by pressing and hardening the synthetic resin fine particles, and the synthetic resin fine particles are held in a communicating porous portion, and the porous portion has the shape described above. 11. The linear motion rolling guide unit according to claim 10, which is impregnated with a lubricant.

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