JP6470536B2 - Linear motion rolling guide unit with holding band - Google Patents

Description

  The present invention relates to a linear motion rolling guide unit of a type comprising a long track rail and a slider that moves relatively on the track rail via a plurality of rolling elements, and having a holding band for holding the rolling elements on the slider. .

  In recent years, the linear motion rolling guide unit has been increasingly applied to sliding parts of various machine devices such as machine tools, various assembly devices, and transport machines.

Conventionally, the ball holder of the linear motion ball bearing developed by the present applicant is opposed to the raceway surface of the slide unit to prevent the ball group on the raceway surface of the slide unit from falling off when not assembled to the track rail. And attached to the slide unit. The ball retainer is 1, as shown in FIGS. 21 to 23, Ri Contact is formed an elongated metal section height is greater than the width in the U-shaped outer end face of the ends of the side plate of the slide unit It is fixed by being hooked in the locking recess. The holding band 7P includes a holding portion 25P that holds the ball 10, a bent portion 26P that is bent at both ends of the holding portion 25P, and a locking claw portion that bends the tip of the bent portion 26P and locks it to the slider. 27P, extending along the track groove formed in the slider, and loosely fitted in a non-contact manner in the holding band groove 23 formed along the track groove 11 on the side surface 37 of the track rail 1, Both side corners in the longitudinal direction along the surface holding the ball 10 are formed at acute angles. The holding band groove 23 formed on the track rail 1 is formed by a bottom 43 and a slope 44 connecting the bottom 43 and the track groove 11. The holding band 7P is formed so that the width of the opposing surface holding the ball 10 is the same as the width of the back surface on the opposite side, and has a substantially rectangular cross section (see, for example, Patent Document 1).

  Also, a linear motion rolling guide unit developed by the present applicant is known. The linear motion rolling guide unit, as its holding band, has a shape in which the width of the opposing surface for holding the ball is longer than the width of the back surface on the opposite side and has a substantially trapezoidal cross section. This increases the holding amount and rigidity of the holding band to improve the holding ability of the ball (for example, see Patent Document 2).

Japanese Utility Model Publication No. 57-165820 Japanese Patent Application Laid-Open No. 8-232953

  However, in the above ball holder, if there is a gap between the ball holder and the locking recess, the ball holder may be displaced in the vertical direction and approach the grinding clearance groove on the track rail raceway surface. In the case of a small linear motion ball bearing linear with a rail width of 5 mm or less, the width dimension of the grinding relief groove is as small as 0.5 mm or less, the clearance with the ball holder is reduced, and the main part of the ball holder is If the position is shifted, it may contact the grinding clearance groove on the track rail raceway surface. Therefore, if the grinding relief groove is enlarged so as not to come into contact with the grinding relief groove, the thickness of the track rail around the raceway groove is reduced, and the rigidity may be lowered.

  In the linear motion rolling guide unit, the holding portion 25P of the holding band 7P is formed to extend linearly. For example, there is no problem when the holding band 7P is held at the center position of the holding band groove 23 of the track rail 1 as shown in FIG. 23. However, as shown in FIG. When the supporting state deteriorates, the holding portion of the holding band 7P is offset in the holding band groove 23 and comes into contact with the inclined surface of the wall surface of the holding band groove 23, and the wall surface of the holding band 7P or the holding band groove 23 Problems that cause damage. That is, the holding band 7P may be displaced with respect to the holding band groove 23 of the track rail 1 due to the dimensional tolerance of each part. In particular, in the case of a small linear motion rolling guide unit, the holding band 7P. And the holding band groove 23 is small, the position of the holding band 7P is displaced, and the holding band groove 23 of the track rail 1 may be contacted.

  By the way, it is conceivable to form the concave groove for the holding band formed on the end cap so as to narrow the width in accordance with the holding band. However, changing the existing mold for molding the end cap is a major issue, and manufacturing is difficult. It makes the price expensive. However, it becomes difficult to form the holding band with a small size and stably position and fix it in the holding band groove without changing the holding band groove of the existing end cap. Further, in the linear motion guide unit, as the size of the linear motion guide unit is reduced, the clearance between the wall surface of the track rail holding band groove and the holding band holding portion is reduced. Similarly, the holding band holding portion is fixed to the track rail holding band. There is a problem that it is difficult to loosely fit into the groove for the holding band without contacting the wall surface of the groove.

An object of the present invention is to solve the above-mentioned problem, and by forming a thin holding band for holding the ball of the rolling element on the slider to increase the clearance with the groove for the holding band, at the same time, Form the bent part into a corrugated shape to increase the size of the bent part in the width direction, and give the end cap a tightening margin for the holding band concave groove, which is the fixed part on the end cap side. , yet retaining the band can be applied to the holding band concave groove of existing end caps, even without the mold changes for molding an end cap, the holding band holding unit holding band for the groove To provide a linear motion rolling guide unit characterized in that the holding band can be positioned and fixed at the center position of the width of the groove for holding band, so that the holding band can be positioned and fixed without rattling. A.

The present invention includes a long track rail in which a first track groove is formed along a longitudinal direction, and a slider that is slidable in the longitudinal direction of the track rail. A casing formed with a second raceway groove extending opposite to the first raceway groove and a return path extending in parallel with the second raceway groove, attached to both end faces of the casing, and the first raceway groove and the second A pair of end caps formed with a direction change path that communicates the track path formed between the track path and the return path, end seals disposed respectively on end surfaces of the end cap, the track path, and the track Because it has a rolling element that is a plurality of balls that roll on a circulation path constituted by a return path and a pair of the direction changing paths, and a holding band that holds the rolling element in the casing. In the linear motion rolling guide unit that,
The holding band is made of a rod-like member, and holds the rolling element along the track path, and bends both end portions of the holding portion in a direction perpendicular to the longitudinal direction. A bent portion that fits into a holding band concave groove formed on the end surface, and a locking claw portion that bends each distal end portion of the bent portion and engages the end cap;
The bent portion of the holding band is formed into a first bent portion and a second bent portion by being bent into a plurality of waveforms in the width direction, and the first bent portion and the second bent portion. The top portions of the first and second bent portions are alternately pressed against and brought into contact with the opposing wall surfaces of the holding band concave groove on the other wall surface with respect to one of the wall surfaces. said top portion is positioned and fixed fitted to with interference the second bent portion and the pressing contact with the first bent portion with respect to the holding-band groove, the prior SL retaining band The holding part is configured such that the first bent part and the second bent part of the corrugation, which are the both end parts of the holding part, are positioned and fixed with respect to the concave groove for the holding band. the center of the said longitudinal formed along the retention band groove in a central position of the first raceway groove of About linear motion rolling guide unit is characterized by being positioned set with a gap in the longitudinal direction relative to and bottom in location.

2. The linear motion rolling guide unit according to claim 1 , wherein in the linear motion rolling guide unit, the plurality of waveforms of the bent portion are configured by a triangular waveform or an arc shape.

  In this linear motion rolling guide unit, the rod-shaped member constituting the holding band is made of a wire member and has a square or round cross section.

  Since this linear motion rolling guide unit is configured as described above, the slider is provided with a holding band for holding the rolling element so that the balls of the rolling element do not fall off the slider when the slider is removed from the track rail. In the state where the slider is set on the track rail, the holding band, in particular, the holding portion of the holding band is loosened in the holding band groove formed along the longitudinal direction at the bottom of the first track groove of the track rail. The holding band is thin with respect to the holding band groove, that is, the width is formed small, and the clearance between the holding band groove and the holding band of the track rail is increased, that is, formed to be large. Therefore, the holding part of the holding band that slides with the slider on the long track rail should contact the wall surface of the track rail holding band groove over the entire length of the track rail. It can be stopped. Moreover, the holding band is disposed in the holding band concave groove of the end cap, and the bent part of the holding band is formed in a zigzag shape so that the width of the bent part is reduced. Since it is formed to be larger than the width of the groove and is inserted into the holding band concave groove with a tightening margin and is positioned and fixed, the holding band is held by the end cap without rattling. That is, by bending the bent part of the holding band into a corrugated shape and increasing the width to give a tightening margin, the holding band can be bent at the bent part regardless of the size of the concave groove for the holding band formed on the end cap. Since it can be stably positioned and fixed to the slider, the holding band can be made as thin as possible within the range that has the ball holding function compared to the conventional one. As a result, the holding part of the holding band and the track rail Sufficient clearance can be secured between the holding band groove formed on the metal plate, damage due to contact of the holding band with the holding band groove on the wall surface can be prevented, and the end cap can be held even with a narrow holding band. Since the holding band is stably supported by the bent part without rattling to the band groove, the holding part that holds the ball of the holding band moves vertically in the holding band groove of the track rail. The positional deviation can be prevented.

In addition, it is easy to set the holding portion of the holding band at the center position of the holding band groove of the track rail, and even if the holding portion of the holding band contacts the wall surface of the holding band groove of the track rail, The position of the holding band is flexibly changed so that damage to the wall surface and holding part of the holding band groove is avoided, and both ends of the holding part of the holding band are bent in a direction perpendicular to the longitudinal direction. The bent portion is formed by bending the bent portion into a corrugated shape, and the bent portion is inserted into the holding band concave groove with a tightening margin. In particular, the holding band can be applied to an existing end cap, and it is not necessary to change the forming die so as to reduce the width of the groove for the holding band of the end cap, thereby reducing the manufacturing cost. Further, in this linear motion rolling guide unit, the holding band attached to the slider has the bent portions at both ends fitted and supported on the end surfaces of the pair of end caps, so the holding portion of the holding band is relatively It is configured to be elastically deformable such that it bends flexibly. Therefore, when the slider is relatively moved on the track rail, as the holding portion comes into contact with the wall surface of the groove for the retaining band, the position of the holding portion is flexibly elastic deformation, for the holding band The structure is such that damage to the wall surface of the groove and the holding portion of the holding band is avoided.

It is a partially broken perspective view which shows one Example of the linear motion rolling guide unit by this invention. It is a side view which shows this linear motion rolling guide unit of FIG. It is a front view which shows partially the slider end surface of the AA position of FIG. It is an enlarged front view which shows the area | region shown with the code | symbol C of FIG. It is sectional drawing which shows this linear motion rolling guide unit in the BB position of FIG. It is an expanded sectional view which shows this linear motion rolling guide unit in the area | region of the code | symbol D of FIG. FIG. 6 is a cross-sectional view at the EE position in FIG. 5 to show a circulation path in the linear motion rolling guide unit. It is a perspective view which shows the holding | maintenance band integrated in this linear motion rolling guide unit. It is a top view which shows the holding | maintenance band of FIG. It is a front view which shows the bending part in the holding | maintenance band of FIG. It is sectional drawing which shows the square cross-sectional shape in the FF position of the holding | maintenance band of FIG. It is a front view which shows the end cap in this linear motion rolling guide unit. It is the side view which looked at the end cap of FIG. 12 from the code | symbol G direction. It is sectional drawing which shows the end cap in the HH position of FIG. FIG. 14 is a bottom view partially showing the end cap of FIG. 13. It is a top view which shows another Example of the holding band integrated in this linear motion rolling guide unit. It is a front view which shows the holding | maintenance band of FIG. It is sectional drawing which shows the holding | maintenance band in the II position of FIG. FIG. 17 is an explanatory diagram showing a relationship between the holding band and the holding band groove of the track rail when the holding band shown in FIG. 16 is incorporated in the linear motion rolling guide unit. It is a front view which shows another Example of the holding band integrated in this linear motion rolling guide unit, (A) is 2nd Example which has four bending parts, (B) is 5 bending parts. A third embodiment and (C) show a fourth embodiment in which the bent portion is formed in an arc. It is a top view which shows the holding | maintenance band in the conventional linear motion rolling guide unit. It is sectional drawing which shows the holding | maintenance band in the JJ position of FIG. It is sectional drawing which shows the relationship between the holding band in the conventional linear motion rolling guide unit, and the groove | channel for holding bands of a track rail. It is sectional drawing which shows the relationship between the holding band in the conventional linear motion rolling guide unit and the groove | channel for holding bands of a track rail, and demonstrates the state which the end surface of the holding band interfered with the wall surface of the groove | channel for holding bands of a track rail.

  Embodiments of a linear motion rolling guide unit according to the present invention will be described below with reference to the drawings. As shown in FIG. 1, the linear motion rolling guide unit according to the present invention is generally formed with track grooves 11 (first track grooves) along the mounting holes 30 and both side surfaces 37 in the longitudinal direction for mounting on a base or the like. The track rail 1 and the track rail 1 are provided so as to be slidable relative to each other via rolling elements. In this embodiment, 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 on both sides. The slider 2 is mainly attached to the casing 3 formed with the track groove 12 (second track groove) formed opposite to the track groove 11 of the track rail 1 and the both end surfaces 38 of the casing 3, and the track 20 And a plurality of rolling paths 19 formed by the end cap 4, the track path 20, the return path 22, and the pair of direction change paths 21 formed with an arc-shaped direction change path 21 that communicates with the return path 22. The ball 10 is a rolling element, the end seal 8 is disposed on the end face 39 of the end cap 4, and the holding band 7 supported by the slider 2 to hold the ball 10 on the slider 2. The return path 22 formed in the casing 3 is formed by a through-hole of a sleeve 17 fitted into a through-hole 31 formed so as to extend parallel to the raceway groove 12 of the casing 3. The track groove 11 of the track rail 1 and the track groove 12 of the casing 3 are formed in a size matching the diameter φDa of the ball 10 so that the cross section is formed in an arc shape and the ball 10 can roll smoothly. The end seal 8 has a sealing function with respect to the track rail 1 and is fixed in contact with the end face 39 of the end cap body 5 and also has a function of preventing the holding band 7 from being detached from the end cap body 5.

The casing 3 is formed with a pair of return paths 22 extending along a pair of track paths 20 formed between the track grooves 11 and the track grooves 12 and attaches objects such as various devices, workpieces, and attachment bodies. A mounting screw hole 29 is formed. The end cap 4 has an outer peripheral portion of the direction changing path 21 on the side opposite to the casing 3 and a recess 35 formed on the casing 3 side, that is, the end surface 40 side in the sliding direction, and has an oil hole 28 for supplying lubricating oil. the formed end cap body 5, and及beauty inner peripheral portion of the direction changing passage 21 in Ke pacing 3 side is formed and a lubricating oil an oil hole for refueling a is formed, fitted into the recess 35 of the end cap body 5 It is comprised from the spacer 6 arrange | positioned together. The end cap body 5 includes a sleeve portion 16 that forms the wall surface of the outer peripheral portion of the direction changing path 21 and an upper portion 15 that connects the sleeve portion 16. The spacer 6 is configured to be fitted and disposed in the recess 35 of the end cap body 5. The direction changing path 21 is formed by aligning the outer peripheral portion formed in the end cap body 5 and the inner peripheral portion formed in the spacer 6 so as to face each other. The end cap 4 is formed such that the upper surface 46, the lower surface 47 and the side surface 48 are slightly smaller than those of the casing 3 (FIG. 3). The slider 2 is screwed into the mounting screw hole formed in the casing 3 through the fixing screw 9 through the spacer 6, the mounting hole 32 formed in the end cap body 5, and the mounting hole formed in the end seal 8. The end cap 4 and the end seal 8 can be fixed to the casing 3.

  In this linear motion rolling guide unit, the sleeve 17 which is inserted into the through hole 31 formed in the casing 3 to form the return path 22 is a porous molded body impregnated with a lubricant, and is made of ultra high molecular weight synthetic resin fine particles. It is configured. The sleeve 17 is formed by pressing and solidifying synthetic resin fine particles in a sleeve shape, heat-molding them, keeping the shape between the synthetic resin fine particles in a communicating porous portion, and impregnating the porous portion with a lubricant. The end cap 4 is formed with a connecting pipe portion 45 that protrudes from the periphery of the direction change path 21 toward the casing 3. The connecting pipe portion 45 of the end cap 4 is fitted into a through hole 31 formed in the casing 3, and connects one end portion of the direction changing path 21 of the end cap 4 and the return path 22 of the casing 3. The other end of the direction changing path 21 of the end cap 4 is connected to a track 20 formed by the track groove 11 of the track rail 1 and the track groove 12 of the casing 3.

  In this linear motion rolling guide unit, the casing 3 includes a pair of upper portions 13 located on the upper surface 36 side of the track rail 1 and a pair of track rails 1 that respectively hang down along the track rail 1 from both sides of the upper portion 13. It is comprised from the sleeve part 14. FIG. A sleeve groove 14 of the casing 3 is formed with a track groove 12 along the longitudinal direction and a return path 22 which is a through hole, and a mating member (not shown) is placed on the upper surface 13 of the casing 3. Four attachment screw holes 29 for attachment to the attachment surface are formed, and attachment screw holes 42 are formed on both sides of the upper portion 13 along the longitudinal direction. Further, as shown in FIG. 12, the end cap body 5 is suspended from an upper portion 15 facing the upper portion 13 of the casing 3, and from a sleeve portion 16 that hangs down from both side portions of the upper portion 15 and faces the sleeve portion 14 of the casing 3. It is configured. The end cap 4 is composed of an upper portion 15 extending in the longitudinal direction and sleeve portions 16 respectively hanging from both side portions of the upper portion 15, and a circulation path 19 of the ball 10 is formed on both sleeve portions 16 of the end cap body 5. The wall surface of the outer peripheral part of the direction change path 21 which comprises is formed, and the wall surface of the inner peripheral part of the direction change path 21 which comprises the circulation path 19 of the ball | bowl 10 is formed in the both sleeve parts of the spacer 6. ing. The direction changing path 21 is formed by aligning and fixing the wall surface of the outer peripheral portion of the end cap body 5 and the wall surface of the inner peripheral portion of the spacer 6, and is formed as an arc-shaped passage that connects the track path 20 and the return path 22. ing. The end cap body 5 is formed with a rake portion 41 at the entrance portion of the direction changing path 21 on the track path 20 side (see FIGS. 12 and 15).

  This linear motion rolling guide unit is particularly characterized by the structure of the holding band 7 that holds the ball 10. As shown in FIGS. 8 to 11, the holding band 7 is formed of a wire shape having a square cross section, and holds the ball 10 along the track 20, and both end portions of the holding portion 25 in the longitudinal direction. Are formed in a bent portion 26 bent in a direction perpendicular to each other, and a locking claw portion 27 in which the respective distal end portions of the bent portion 26 are bent, and in particular, the bent portion 26 is configured to be bent into a plurality of waveforms. The bent portion 26 is characterized by being fitted into the holding band concave groove 24 formed on the end face 39 of the end cap 4 on the end seal 8 side with a tightening margin. The end cap body 5 is formed with a holding band concave groove 24 into which the bent portion 26 of the holding band 7 is fitted on the end surface 39 on the side opposite to the casing 3, and the side band 48 of the end cap body 5 has the holding band 7. A locking claw groove 49 for fitting and locking the locking claw 27 is formed (see FIG. 13). The holding portion 25 of the holding band 7 is set at the center position of the holding band groove 23 which is a concave groove formed along the longitudinal direction on the bottom 43 (FIG. 6) of the track groove 11 of the track rail 1. Even if the holding portion 25 of the band 7 comes into contact with the wall surface (the bottom 43 and the slope 44) of the holding band groove 23 of the track rail 1, the position of the holding portion 25 of the holding band 7 changes flexibly and the holding band groove 23 is obtained. It is comprised in the structure where the damage of the holding | maintenance part 25 of this wall surface and the holding band 7 is avoided. In this linear motion rolling guide unit, as shown particularly in FIGS. 3 and 4, the tops (the first bent portion 33 and the second bent portion 34) of the waveform of the bent portion 26 are concave grooves for holding bands. 24 are pressed alternately on the side wall surfaces facing each other. In addition, the plurality of waveforms of the bent portion 26 includes a central first bent portion 33 and a second bent portion 34 in which the waveform of the first bent portion 33 is inverted on both sides of the first bent portion 33. ing. In the holding band 7 incorporated in this linear motion rolling guide unit, the first bent portion 33 and the second bent portion 34 forming the bent portion 26 have apexes facing in opposite directions, and the first The shapes of the bent portion 33 and the second bent portion 34 are formed such that the fastening allowance is elastically deformed and is stably fixed in the holding band concave groove 24 of the end cap 4.

In the linear motion rolling guide unit according to the present invention, the plurality of waveforms of the bent portion 26 are triangular waveforms as shown in FIGS. 10, 17, and 20A and 20B, or FIG. As shown in FIG. The holding band 7 can be formed in a square shape as shown in FIG. 6 or FIG. 11 or in a round shape as shown in FIG. In this linear motion rolling guide unit, the holding band 7 is formed in a square cross-sectional shape, so that the holding band groove of the track rail 1 can be compared with a conventional holding band 7P having a rectangular cross section. 23 can be formed with a large clearance from the wall portion (slope 44). In addition to the holding band 7 shown in FIGS. 8 to 11, as another embodiment, as shown in FIGS. 16 to 19, the holding band 7 </ b> E having a round wire shape can be formed. . The holding band 7E has the same function as the holding band 7, and includes a holding portion 25E, bent portions 26E at both ends thereof, and a locking claw member 27E as a tip member of the bent portion 26E. In addition, as shown in FIG. 20, the holding band 7 </ b> A in which one bent portion 26 </ b> A is formed in comparison with the bent portion 26 of the holding band 7 of the first embodiment, compared with the holding band 7B of bent portions 26B are formed two more, or to the holding band 7A holding band 7 C of bent portions 26C are formed in an arcuate shape as compared with the bent portion of the holding portion 26A of the It can also be formed. Of course, the holding bands 7A, 7B, and 7C include the holding portions 25A, 25B, and 25C that hold the ball 10, the bent portions 26A, 26B, and 26C at both ends of the holding portion , and the bent portions that are bent. The claw portions 27A, 27B, and 27C are formed respectively.

  As described above, in this linear motion guide unit, the slider 2 has a holding band 7 for holding the ball 10 so that the ball 10 of the rolling element does not fall off from the slider 2 when the slider 2 is removed from the track rail 1. When the slider 2 is set on the track rail 1, the holding band 7, in particular, the holding portion 25 of the holding band 7 is formed on the bottom 43 of the track groove 11 of the track rail 1 along the longitudinal direction. It is loosely fitted into the holding band groove 23 formed of a concave groove. However, the holding band 7 that slides along with the slider 2 with respect to the long track rail 1, in particular, the holding portion 25 of the holding band 7 extends over the entire length of the track rail 1 in the holding band groove 23 of the track rail 1. It is difficult to loosely fit into the holding band groove 23 without contacting the slope 44 of the wall surface. Further, as the linear motion guide unit is formed in a smaller size, the gap between the wall surface of the holding band groove 23 of the track rail 1 and the holding portion 25 of the holding band 7 becomes smaller, and similarly the holding portion 25 of the holding band 7. However, it is difficult to loosely fit into the holding band groove 23 without contacting the inclined surface 44 of the wall surface of the holding band groove 23 of the track rail 1. In the linear motion rolling guide unit according to the present invention, the holding portion 25 of the holding band 7 can be easily set at the center position of the holding band groove 23 of the track rail 1, and the holding portion 25 of the holding band 7 holds the track rail 1. Even if it contacts with the wall surface of the band groove 23, the position of the holding portion 25 of the holding band 7 is flexibly changed so that damage to the wall surface of the holding band groove 23 and the holding portion 25 is avoided. The bent portion 26 is formed by bending the bent portion 26 into a wave shape in the bent portion 26 in which the both end portions of the holding portion 25 of the holding band 7 are bent in a direction perpendicular to the longitudinal direction. The groove 24 is positioned and fixed stably by fitting with a tightening margin.

  In this linear motion rolling guide unit, the bent portion 26 of the holding band 7 is bent so that the width of the bent portion 26 is substantially from the apex of the first bent portion 33 to the apex of the second bent portion 34. The width of the holding band concave groove 24 formed in the end cap 4 is larger than the width of the concave groove 24 for the holding band formed in the end cap 4. A deadline will be given. The bent portion 26 has a first bent portion 33 and a second bent portion 34, which are a plurality of convex portions, and is formed into a waveform that is bent at a plurality of locations. In this embodiment, specifically, The second bent portion 34 provided in the vicinity of the center of the bent portion 26 and two first bent portions 33 provided on both sides thereof, the first bent portion 33 and the second bent portion 34 are It is formed in an obtuse substantially V shape, and the apex of the first bent portion 33 and the second bent portion 34 is fitted and fixed to the wall surface of the holding band concave groove 24 of the end cap 4. .

  The linear motion rolling guide unit is, for example, formed in a miniature compact having a track rail 1 having a width of 5 mm, a slider 2 having a width of 12 mm, and a total height of 6 mm. Further, in the track rail 1, for example, the holding band groove 23 has a substantially trapezoidal cross section. The holding band 7 is formed of a stainless steel material, the cross-sectional dimensions a and b thereof are formed to 0.2 mm, and the end cap 4 is formed of a resin material that can be elastically deformed. In this embodiment, the width d of the holding band concave groove 24 of the end cap 4 is about 0.3 mm between the opposing wall surfaces. The holding band 7 before being assembled into the end cap 4 has a band thickness dimension a of 0.2 mm and a bent part width dimension c of 0.4 mm. Therefore, the bent portion 26 of the holding band 7 is compressed by 0.1 mm between the wall surfaces of the holding band concave groove 24 of the end cap 4 and elastically deformed, and the holding band 7 with respect to the holding band concave groove 24 of the end cap 4 is compressed. The bend portion 26 of the holding band 7 is in contact with the holding band concave groove 24 of the end cap 4 at three locations. The substantially V-shaped apexes of the first bent portion 33 and the second bent portion 34 are directed in the vertical direction of the slider 2 in opposite directions.

  In this linear motion rolling guide unit, the holding band groove 23 is formed in a shape expanding from the bottom 43 side toward the track groove 11 side, and the wall portion of the holding band groove 23 is formed on the inclined surface 44. That is, the holding band groove 23 formed in the track rail 1 has a substantially trapezoidal cross section, for example. The inclination angle α of the inclined surface 44 of the holding band groove 23 is, for example, about 8 °, and the dimension h from the side surface 37 of the track rail 1 to the bottom 43 of the holding band groove 23 is, for example, about 0.75 mm. Is formed. This linear motion rolling guide unit has the bottom of the holding band 7 and the holding band groove 23 in a state where the slider 2 is straddled on the track rail 1 and the holding band 7 is positioned in the holding band groove 23 of the track rail 1. There is a slight clearance between them and 43. Further, the holding band groove 23 formed in the track rail 1 has a bottom portion 43 having a height dimension e of, for example, about 0.4 mm. Further, regarding the clearance dimension between the upper and lower surfaces of the holding band 7 and the slope 44 of the wall portion of the holding band groove 23, the clearance dimension f on the bottom 43 side is smaller than the clearance dimension g on the opening side. In this linear motion rolling guide unit, the holding band groove 23 formed on the track rail 1 can be formed simultaneously with the side surface 37 of the track rail 1 and the track groove 11.

  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 7, 7A, 7B, 7C, 7E Holding band 8 End seal 10 Ball (rolling element)
11 Track groove (first track groove)
12 Track groove (second track groove)
DESCRIPTION OF SYMBOLS 19 Circulation path 20 Track path 21 Direction change path 22 Return path 23 Holding band groove 24 Holding band concave groove 25, 25A, 25B, 25C, 25E Holding section 26, 26A, 26B, 26C, 26E Bending section 27, 27A , 27B, 27C, 27E Locking claw part 33 First bent part 34 Second bent part 37 Side face 38, 39 End face

Claims (3)

An elongate track rail formed with a first track groove along a longitudinal direction; and a slider slidable in the longitudinal direction of the track rail, the slider being the first track groove of the track rail. A casing having a second raceway groove extending opposite to and a return path extending in parallel with the second raceway groove, attached to both end faces of the casing, and the first raceway groove and the second raceway groove A pair of end caps formed with a direction changing path communicating between the track path formed between the track path and the return path; end seals respectively disposed on end surfaces of the end cap; the track path and the return path paired with each other A rolling element comprising a rolling element that is a plurality of balls that roll on a circulation path constituted by the direction change path, and a holding band that holds the rolling element in the casing. In the guide unit,
The holding band is made of a rod-like member, and holds the rolling element along the track path, and bends both end portions of the holding portion in a direction perpendicular to the longitudinal direction. A bent portion that fits into a holding band concave groove formed on the end surface, and a locking claw portion that bends each distal end portion of the bent portion and engages the end cap;
The bent portion of the holding band is formed into a first bent portion and a second bent portion by being bent into a plurality of waveforms in the width direction, and the first bent portion and the second bent portion. The respective top portions alternately press contact with the opposing wall surfaces of the holding band concave groove, and the first bent portion and the second bent portion on the other wall surface with respect to one of the wall surfaces, of said top portion is positioned and fixed by fitting with interference the second bent portion and the pressing contact with the first bent portion with respect to the holding-band groove, before Symbol retaining band The holding portion is configured so that the first bent portion and the second bent portion of the corrugation, which are the both end portions of the holding portion, are positioned and fixed with respect to the holding band concave groove. of the longitudinal direction are formed along a retaining band groove in a central position of the first raceway groove of the rail Linear motion rolling guide unit is characterized by being positioned set with a gap in the longitudinal direction relative to and bottom in central position. 2. The linear motion rolling guide unit according to claim 1, wherein the plurality of waveforms of the bent portion are configured by a triangular waveform or an arc shape. The linear motion rolling guide unit according to claim 1 or 2, wherein the rod-shaped member constituting the holding band is formed of a wire member and has a square or round cross section.

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