WO2021172265A1 - 直動案内ユニット - Google Patents

直動案内ユニット Download PDF

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Publication number
WO2021172265A1
WO2021172265A1 PCT/JP2021/006598 JP2021006598W WO2021172265A1 WO 2021172265 A1 WO2021172265 A1 WO 2021172265A1 JP 2021006598 W JP2021006598 W JP 2021006598W WO 2021172265 A1 WO2021172265 A1 WO 2021172265A1
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WO
WIPO (PCT)
Prior art keywords
roller
casing
holding member
cantilever
guide surface
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.)
Ceased
Application number
PCT/JP2021/006598
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English (en)
French (fr)
Japanese (ja)
Inventor
岩田　保
康博 大辻
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.)
Nippon Thompson Co Ltd
Original Assignee
Nippon Thompson Co Ltd
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
Application filed by Nippon Thompson Co Ltd filed Critical Nippon Thompson Co Ltd
Publication of WO2021172265A1 publication Critical patent/WO2021172265A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C29/00—Bearings for parts moving only linearly
    • F16C29/04—Ball or roller bearings
    • F16C29/06—Ball or roller bearings in which the rolling bodies circulate partly without carrying load
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C29/00—Bearings for parts moving only linearly
    • F16C29/12—Arrangements for adjusting play

Definitions

  • the present invention is a roller type in which the holding plate is provided with a means for pressing the end face of the roller in order to align the axis of the roller that rolls into the track so as to be orthogonal to the guide surface between the casing and the holding plate.
  • the linear motion guidance unit This application claims priority based on Japanese Patent Application No. 2020-033859 filed on February 28, 2020, and incorporates all the contents described in the Japanese patent application.
  • the axis of the roller that rolls in the track may tilt with respect to the traveling direction, and at that time, the tilted roller rolls with sliding friction and skew occurs.
  • the skew of the roller which is a rolling element
  • the conventional linear motion guide unit a slight gap is required between the end face of the roller and the guide surface in order to circulate the roller smoothly.
  • an inexpensive measure has been desired to prevent the occurrence of skew.
  • the applicant provides a slit at the end 27 of the holding member 49 constituting the holding plate for holding the end face 25 of the roller 5 which is a rolling element, and holds the roller 5.
  • a spring member provided on the member 49 that elastically deforms the holding member 49 to press the end face 25 of the roller 5 and correct the posture of the roller 5.
  • the linear motion guide unit forms a guide surface 32 for guiding the end surface 25 of the roller 5 on the holding member 49, and forms protruding portions 44 protruding from the guide surface 32 on both end portions 27 of the holding member 49 facing the casing 3. do.
  • the posture of the roller 5 tilted in the no-load region is aligned so that its axis is orthogonal to the guide surface 31 of the casing 3, and the roller 5 is brought into the load region 43 in the correct posture to slide. It suppresses fluctuations in dynamic resistance and heat generation.
  • the roller 5 rolls from the direction change path to the track path 14, the roller 5 is pressed toward the guide surface 31 of the casing 3 by the protrusion 44 provided on the holding member 49.
  • the axial center of the roller 5 is aligned on the inlet side of the casing 3 in a posture orthogonal to the guide surface 31, and the occurrence of skew of the roller 5 is prevented (for example, Patent Document). 1).
  • the linear motion guide unit of Patent Document 1 has a structure in which a slit is formed in the end portion 27 of the holding member 49 to elastically deform the end face 25 of the roller 5.
  • the guide surface 32 and the protruding portion 44 of the holding member 49 may become slanted, and the protruding portion 44 may come into contact with only a part of the rollers 5. Therefore, the function of correcting the posture of the roller 5 by pressing the roller 5 against the guide surface 31 of the casing 3 may be insufficient.
  • the applicant surrounds a protrusion that presses the roller, in addition to a slit that extends from the end face side formed in the center of the holding member constituting the holding plate in the width direction. Therefore, we focused on providing another slit so as to face the end face side. As a result, a plurality of rollers can be pressed at the same time by appropriately contacting the tongue piece portion instead of the protruding portion with the roller end face.
  • an object of the present invention is to align the rollers so that the posture of the rollers tilted in the no-load region in the circulation path, that is, the axis is orthogonal to the guide surface of the casing in the roller type linear motion guide unit, and load the load region. It is to roll in the correct posture.
  • the holding member constituting the holding plate in order to suppress fluctuations in sliding resistance and heat generation, is provided with a structure for pressing the roller end face.
  • slits are provided at the ends of the holding members to form bifurcated elastically deformable cantilever-shaped holding portions, and U-shaped slits are further formed in these cantilever-shaped holding portions.
  • a further cantilever-shaped tongue piece was formed.
  • the longitudinal positions of the free end and the fixed end of the cantilever-shaped holding portion and the tongue piece portion are formed in opposite positions. That is, the cantilever-shaped holding portion and the tongue piece portion are formed in opposite directions.
  • the cantilever-shaped holding portion and the tongue piece portion can gradually align the postures of the plurality of rollers so that the axis of the roller is orthogonal to the guide surface of the casing.
  • An object of the present invention is to provide a linear motion guide unit capable of allowing a roller to enter a load path of an orbital path in a correct posture and preventing the occurrence of roller skew in the load path.
  • a track rail having a first raceway surface formed along both side surfaces in the longitudinal direction and a second raceway surface straddling the raceway rail and facing the first raceway surface are formed and described above. It consists of a slider that moves relative to the track rail via a roller that is a rolling element that rolls on the track path composed of the first track surface and the second track surface, respectively.
  • the slider A casing in which a pair of the second raceway surfaces and a return path extending parallel to the second raceway surface are formed, and a direction change fixed to both end faces in the longitudinal direction of the casing and communicating the track path and the return path.
  • the casing is formed with a pair of first guide surfaces adjacent to and orthogonal to the second raceway surface and guiding one end surface of the roller, and the raceway is formed at both ends of the second raceway surface.
  • Each crowning part is formed so that it can enter the loaded road from the unloaded road.
  • the cantilever-shaped holding portion of the holding member is formed with a second guide surface that faces the first guide surface of the casing and guides the other end surface of the roller, and the crowning. Tongue pieces protruding from the second guide surface toward the first guide surface of the casing are formed at both ends of the second guide surface facing the portions.
  • the straight tongue piece portion presses one end surface of the plurality of rollers toward the first guide surface to align the postures of the rollers, thereby preventing the occurrence of skew of the rollers.
  • the holding plate is arranged in a synthetic resin holding member on which the second guide surface is formed, and a concave groove formed on the back surface side of the second guide surface of the holding member, and the holding member.
  • a metal fixing member for fixing the casing to the casing, and a plurality of predetermined positions of the holding member in the longitudinal direction are arranged in the cutouts, and the space between the fixing member and the casing is predetermined. It is composed of metal spinning top members set at predetermined predetermined intervals.
  • the tip portion formed by the longitudinal direction between the pair of second guide surfaces of the holding member and the convex portion having a V-shaped cross section of the holding member is the casing. It is fitted into a concave locking groove having a V-shaped cross section formed along the longitudinal direction between the second raceway surfaces.
  • the cantilever-shaped holding portion formed at the end portion of the holding member is formed by the first slit extending from both end faces toward the center in the longitudinal direction at the center in the width direction between the second guide surfaces.
  • Each of the tongue pieces is formed by a U-shaped second slit formed on the second guide surface located in the cantilever-shaped holding part, and the tongue pieces are elastically deformed to form a plurality of pieces. The one end surface of the roller is simultaneously pressed toward the first guide surface.
  • the direction change path side of the end cap is formed at the first free end and the load path side of the track path is formed at the first fixed end, and the tongue piece portion is the tongue piece portion.
  • the direction change path side of the end cap is formed at the second fixed end and the load path side is formed at the second free end.
  • the tongue piece portion is formed on a protruding guide surface protruding from the second guide surface of the cantilever-shaped holding portion, and the protruding guide surface is the second end surface side of the cantilever-shaped holding portion. It is formed in the shape of a cantilever that can be elastically deformed with a fixed end.
  • a spring member that presses the first slit in the direction of expanding the first slit is arranged in the first slit formed in the holding member.
  • the end portion of the holding member constituting the holding plate is formed in the cantilever-shaped holding portion by the first slit, and the second slit is formed in the cantilever-shaped holding portion.
  • the tongue piece formed by the above is formed in a cantilever-like structure, and the tongue piece is inclined so as to project with respect to the second guide surface of the cantilever-shaped holding portion.
  • the linear motion guide unit can press a plurality of rollers at the same time by elastically deforming the tongue piece along the roller end face. Further, by forming the tongue piece portion in the cantilever-shaped holding portion, the strength and slit shape of those springs can be characterized.
  • the pressing force of the tongue piece can be set appropriately, the number of rollers pressed at the same time can be increased or decreased, and the postures of a plurality of rollers can be aligned at the same time. Therefore, fluctuations in sliding resistance and heat generation can be effectively suppressed.
  • the cantilever-shaped holding portion and the cantilever-shaped tongue piece portion formed therein are formed so that their free ends and fixed ends are opposite to each other in the longitudinal direction. In other words, the direction of expansion of the tongue piece and the cantilever-shaped holding part is opposite.
  • the tongue piece and the cantilever-shaped holding part exert a pressing force on both ends of the roller end face in the longitudinal direction, so that the rollers can be aligned in the correct posture.
  • the holding member constituting the holding plate is manufactured by injection molding of resin, the manufacturing cost can be reduced.
  • the concave groove of the holding member for arranging the fixing member constituting the holding plate is provided with a convex portion that abuts on the fixing member, a gap may be provided between the side surface of the fixing member and the holding member. Therefore, when the cantilever-shaped holding portion of the holding member is deformed, the fixing member and the cantilever-shaped holding portion do not interfere with each other.
  • This linear motion guide unit is aligned so that the posture of the roller that rolls and tilts in the no-load area of the circulation path, that is, the axis is orthogonal to the guide surface of the casing and the holding member, and the roller is in the correct posture. Can enter the load zone. Therefore, it is possible to suppress sliding catching due to roller skew, early wear, fluctuation of sliding resistance, and heat generation. Further, the inclined surfaces formed on both ends of the tongue piece provided on the holding member can gradually align the posture of the roller so that the roller axis is orthogonal to the guide surface of the casing, so that the roller can be smoothly aligned. Can be rolled in the circulation path.
  • this linear motion guide unit presses the tongue piece against the end face of the roller by utilizing the fact that the cantilever-shaped holding part of the holding member bends when the roller passes through the tongue piece formed on the holding member. Therefore, the tilted roller posture can be reliably aligned with the guide surface of the casing so that the roller axis is orthogonal to the guide surface of the casing. Since this linear motion guide unit does not require strict clearance management between the roller and the circulation path, the manufacturing cost can be reduced. Further, a spring member for urging elastic deformation can be provided on the cantilever-shaped holding portion at the end of the holding member, and the protruding guide surface of the tongue piece can be reliably pressed against the roller end face.
  • FIG. 3 is an exploded perspective view showing the holding member, the fixing member, and the top member constituting the holding plate of FIG. 3 in an exploded manner.
  • FIG. 5 is a plan view of the holding member of FIG. 5 as viewed from the raceway surface side of the casing.
  • FIG. 5 is a plan view of the holding member of FIG. 5 as viewed from the raceway surface side of the raceway rail.
  • FIG. 5 is a plan view of the holding member of FIG. 5 as viewed from the upper surface side of the casing.
  • FIG. 5 is a front view of the casing, holding plate, and roller in the linear motion guide unit of FIG. 1 as viewed from the end face side of the casing.
  • It is sectional drawing which shows the holding member in line BB of FIG.
  • the roller shows the movement of rolling from the direction change path to the track path, and is a conceptual diagram showing a plane seen from the end face side of the roller.
  • the tongue piece portion provided on the cantilever-shaped holding portion formed on the holding member in this linear motion guide unit presses the end face of the roller, and the cantilever-shaped holding portion formed by the first slit is flexed.
  • the linear motion guide unit according to the present invention is generally composed of a track rail 1 and a slider 2.
  • the track rail 1 is formed with two rows of track surfaces 21 (first track surfaces) on both side surfaces 23 in the longitudinal direction.
  • the orbital planes 21 of the two rows are formed in directions orthogonal to each other in a cross section perpendicular to the longitudinal direction.
  • the slider 2 is formed with two rows of raceway surfaces 22 (second raceway surfaces) straddling the raceway rails 1 and facing the raceway surfaces 21.
  • the orbital planes 22 of the two rows are formed in the directions orthogonal to each other in the cross section perpendicular to the longitudinal direction.
  • the slider 2 moves relative to the track rail 1 via a roller 5, which is a rolling element that rolls on the track 14 composed of the track surface 21 and the track surface 22, respectively.
  • the slider 2 has a casing 3, an end cap 4, an end seal 8, a roller 5, and a holding plate 7.
  • the casing 3 is formed with a pair of raceway surfaces 22 and a pair of return paths 15 extending parallel to the raceway surfaces 22.
  • the end cap 4 is fixed to both end faces 26 in the longitudinal direction of the casing 3, and a pair of turning paths 39 (see FIGS. 11 to 14) that communicate the track path 14 and the return path 15 are formed. There is.
  • the end seals 8 are arranged on the end faces of the end caps 4, respectively.
  • the roller 5 rolls on an infinite circulation path composed of a track path 14, a return path 15, and a pair of turnaround paths 39.
  • the holding plate 7 is arranged along the track 14, and holds the roller 5 in cooperation with the casing 3.
  • the end cap 4 is composed of an end cap main body 4H forming the outer peripheral surface side of the turning path 39 and a spacer 4S forming the inner peripheral surface side of the turning path 39. ..
  • the track rail 1 is formed with a plurality of mounting holes 58 into which bolts (not shown) are inserted when the track rail 1 is mounted on a mating member such as a base, a bed, or a machine base.
  • the casing 3 is formed with a plurality of mounting screw holes 57 for mounting on a mating member such as a work or an apparatus on the upper surface thereof.
  • the end cap 4 is provided with a lubrication hole 61 capable of supplying a lubricant in the turning path 39, and is closed by a stopper 62 when lubrication is not performed.
  • An end cap 4 and an end seal 8 are fixed to the casing 3 by fixing bolts 60.
  • this linear motion guide unit is configured as, for example, a four-row row type linear motion guide unit provided with four track paths 14.
  • the casing 3 is composed of a main body portion 64 provided with screw holes 57 and a pair of sleeve portions 65 hanging from both ends of the main body portion 64.
  • the roller 5 is formed of a rolling surface 24 that rolls on a track 14 composed of track surfaces 21 and 22, and both end surfaces 25 thereof.
  • a return path 15 for rolling the rolling surface 24 of the roller 5 with no load is formed on both sleeves 65 of the casing 3 so as to extend along the raceway surface 22.
  • the return path 15 is formed by a sleeve 6 fitted in the fitting hole 56 formed in the sleeve portion 65 of the casing 3.
  • a relief groove 66 on which the track surface 21 is formed is formed along the longitudinal direction. Further, in the sleeve portion 65 of the casing 3, a concave locking groove 36 is formed between the upper and lower raceway surfaces 22 extending in a direction orthogonal to each other.
  • a tip portion 33 is formed on the holding member 12 constituting the holding plate 7. The tip portion 33 is composed of a top portion 47 extending in the longitudinal direction adjacent to a guide surface 32 (second guide surface) extending in the longitudinal direction and orthogonal to each other. The top 47 of the holding member 12 is fitted and arranged in the concave locking groove 36 of the casing 3.
  • a guide surface 31 (first guide surface) for guiding one end surface 25 of the roller 5 is formed on the sleeve portion 65 of the casing 3. Further, the holding plate 7 at a position facing the guide surface 31 is formed with a guide surface 32 for guiding the other end surface 25 of the roller 5.
  • the casing 3 is formed with a guide surface 31 orthogonal to the track surface 22 along the track path 14 extending in the longitudinal direction. Further, as shown in FIGS. 11 to 13, the rollers 5 are formed on both ends of the track surface 22 in a gentle curve that allows the rollers 5 to smoothly enter the load path 43 from the unloaded path 43N of the track path 14.
  • the crowning portions 30 are formed respectively.
  • the crowning portion 30 formed on the raceway surface 22 of the casing 2 with a predetermined length LC is composed of a no-load path 43N on the casing end side on the direction change path 39 side and a load path 43 on the track path 14 side. There is.
  • a lower surface seal 59 is arranged between the lower surface of the sleeve portion 65 and the track rail 1.
  • the holding plate 7 is mainly composed of a holding member 12, a fixing member 13, and a top member 18.
  • the holding member 12 is a member made of synthetic resin on which a guide surface 32 for guiding the other end surface 25 of the roller 5 is formed.
  • the fixing member 13 is a metal member that fits into the concave groove 50 formed on the back surface side of the guide surface 32 of the holding member 12 to fix the holding member 12 to the casing 3.
  • the top member 18 is arranged in a top mounting hole 51 in which a plurality of predetermined positions in the longitudinal direction of the holding member 12 are cut out.
  • the top member 18 is a metal member that sets a predetermined interval between the fixing member 13 and the casing 3.
  • the concave groove 50 formed in the holding member 12 is formed with a convex portion 48 extending inwardly in contact with the fixing member 13.
  • a gap is formed between the side surface of the fixing member 13 and the holding member 12 by the convex portion 48, and when the cantilever-shaped holding portion 11 of the holding member 12 is deformed, the fixing member 13 and the cantilever-shaped holding portion 11 are deformed. It is configured so that it does not interfere with.
  • the spinning top member 18 is loosely fitted in the spinning top mounting hole 51 which is a spinning top mounting portion formed in the holding member 12.
  • the holding member 12 is formed with a slit 45 (first slit) extending in the longitudinal direction at an intermediate position in the width direction of the end portion 27.
  • the end portion 27 of the holding member 12 is formed in the pair of cantilever-shaped holding portions 11 by the slit 45.
  • the cantilever-shaped holding portion 11 is formed with elastically deformable guide surfaces 32 on both sides of the slit 45.
  • the cantilever-shaped holding portion 11 has a load path 43 of the track path 14 whose direction change path side, which is the end 27 side of the holding member 12, is the free end 19 (first free end) and which is the center side of the holding member 12.
  • the side is formed at the fixed end 20 (first fixed end).
  • the holding member 12 is formed with a claw portion 55 extending in the longitudinal direction of the guide surface 32 in order to support the corner portion of the rolling surface 24 of the roller 5 and hold the roller 5.
  • Recesses 35 are formed at both ends 27 of the holding member 12 to form a space for arranging the spring member 40.
  • the cantilever-shaped holding portion 11 is configured to be elastically deformable.
  • the holding member 12 is formed with a notch 52 for greasing adjacent to the top mounting hole 51 at the tip 33 thereof.
  • the lubrication notch 52 provides a space for supplying the lubricant from the lubrication hole 61 to the raceway surface 22 and the raceway 14.
  • slits 9 (second slits) notched in a U shape are formed at both ends 27 of the guide surface 32 formed in the cantilever-shaped holding portion 11. It is characterized in that the tongue piece portion 10 is formed.
  • the slit 9 cut out in a U shape is formed so as to surround the tongue piece portion 10, and the tongue piece portion 10 is formed in a cantilever shape.
  • the tongue piece portion 10 is formed on a protruding guide surface 54 that protrudes from the guide surface 32 and guides the end surface 25 of the roller 5.
  • the holding member 12 has a cantilever-shaped tongue piece portion 10 formed on a protruding guide surface 54 protruding from the guide surface 32 of the cantilever-shaped holding portion 11, and the tongue piece portion 10 can be elastically deformed. It is characterized in that it is formed in a cantilever-like member.
  • the casing 3 is formed with a pair of guide surfaces 31 adjacent to the raceway surface 22 and orthogonal to each other and guiding one end surface 25 of the roller 5. Further, as shown in FIG. 11, the casing 3 is formed with crowning portions 30 at both ends of the track surface 22 so as to be able to enter the load path 43 from the unloaded path 43N of the track path 14.
  • the holding plate 7 is formed with a pair of guide surfaces 32 that face each of the guide surfaces 31 of the casing 3 and guide the other end surface 25 of the roller 5. Further, the holding plate 7 is formed with tongue piece portions 10 protruding from the guide surface 32 toward the guide surface 31 of the casing 3 at both ends of the guide surface 32 facing the crowning portion 30 of the casing 3. ..
  • the protruding guide surface 54 which is the tongue piece portion 10, presses one end surface 25 of the plurality of rollers 5 toward the crowning portion 30 on the guide surface 31 according to the above configuration.
  • the roller 5 is characterized in that the postures of the rollers 5 are aligned with each other.
  • the casing 3 has a pair of guide surfaces 31 adjacent to the raceway surface 22 and orthogonal to each other and guiding one end surface 25 of the roller 5.
  • a pair of guide surfaces 32 facing each other and guiding the other end surface 25 of the roller 5 are formed on both ends 27 in the longitudinal direction of the holding plate 7. That is, the guide surfaces 32 formed on the holding member 12 are formed in pairs, and each guide surface 32 is provided with a tongue piece portion 10.
  • the end surface 28 side of the cantilever-shaped holding portion 11 on the direction change path 39 side of the end cap 4 is formed at the fixed end 17 (second fixed end), and the load path 43 of the track path 14 is formed. The side is formed at the free end 19 (second free end).
  • the longitudinal positions of the free end 16 and the fixed end 17 of the tongue piece portion 10 are opposite to the longitudinal positions of the free end 19 and the fixed end 20 of the cantilever-shaped holding portion 11.
  • the tongue piece portion 10 and the cantilever-shaped holding portion 11 are formed in opposite directions to each other. That is, on the end surface 25 of the roller 5, bending forces due to elastic deformation of the free end 16 of the tongue piece portion 10 and the free end 19 of the cantilever-shaped holding portion 11 act from both sides in the longitudinal direction, thereby causing the roller. 5 will be aligned in the correct posture.
  • the cantilever-shaped holding portion 11 on which the guide surface 32 is formed is formed with slits 9 surrounding the tongue piece portion 10, and the tongue piece portion 10 has a protruding guide surface 54 thereof. It protrudes from the guide surface 32 of the cantilever-shaped holding portion 11.
  • the protruding guide surface 54 of the tongue piece portion 10 elastically deforms and presses a plurality of one end surfaces 25 of the roller 5 toward the guide surface 31 at the same time.
  • the tongue piece portion 10 functions to elastically press one end surface 25 of the plurality of rollers 5 toward the guide surface 31 to align the postures of the rollers 5.
  • the tongue piece portion 10 when the upper and lower rollers 5 rolling on the track 14 pass through the cantilever-shaped tongue piece portions 10, the tongue piece portion 10 casings the end surface 25 of the roller 5.
  • the postures of the rollers 5 can be aligned by pressing each of the guide surfaces 31 of the roller 5.
  • the fixing bolt 41 is inserted into the through hole 34 which is the mounting hole of the casing 3 and screwed into the mounting screw hole 42 formed in the fixing member 13 of the holding plate 7, whereby the holding plate is screwed. 7 is fixed to the casing 3.
  • the slider 2 is formed to have a length that can be efficiently implemented in order to realize high rigidity and high accuracy, and the total length of the casing 3 is an abbreviation of the width dimension of the track rail 1. It is an ultra-long type that is formed as long as four times as long. Further, the length LC of the crowning portion 30 formed in the casing 3 is formed substantially 4 ⁇ 0.5 times the diameter of the roller 5.
  • the casing 3 is formed, for example, to have a length that allows three to four mounting holes 58 of the track rail 1 to hang, and is 6.3 to 8.3 times the length of the end cap 4 in the moving direction. It is formed to a length. Even if the length LC of the crowning portion 30 differs depending on the total length of the casing 3, the tongue piece portion 10 formed on the holding plate 7 is a region from the region of the unloaded passage 43N of the crowning portion 30 to the region of the load path 43. Is formed to reach. Further, the portion of the tongue piece portion 10 facing the guide surface 31 of the casing 3 is formed on a plane parallel to the guide surface 31, and is on the direction change path 39 side of the end portion 27 of the holding member 12 leading to the tongue piece portion 10.
  • the inclination angle of the inclined surface 37 (first inclined surface) is formed to be smaller than the inclined angle of the inclined surface 38 (second inclined surface) on the track 14 side.
  • the longitudinal length L1 of the inclined surface 37 is formed to be substantially 1.2 times or more the roller diameter
  • the longitudinal length of the inclined surface 38 is formed.
  • L3 is formed to be substantially 0.25 times or more the roller diameter.
  • the length L2 of the flat surface of the tongue piece portion 10 formed on the guide surface 32 of the cantilever-shaped holding portion 11 is formed to be substantially 2 to 3 times or more the roller diameter.
  • the protruding portion length L including the tongue piece portion 10 is formed to be 3 to 4 times the roller diameter.
  • the tongue piece portion 10 is formed at a position where the guide surface 31 of the casing 3 and the rotation shaft core position of the roller end surface 25 are pressed.
  • the inclined surfaces 37 and 38 may have a curved cross-sectional shape in the longitudinal direction.
  • the slit 45 reaches the load path 43 of the track path 14 from the end portion 27 of the holding member 12, and is formed longer than the crowning portion 30 formed on the track surface 22 of the casing 3.
  • spring members 40 for pressing the cantilever-shaped holding portions 11 in the expanding direction are arranged in recesses 35 formed between the cantilever-shaped holding portions 11.
  • the end portions of the guide surfaces 32 are formed on the cantilever-shaped holding portions 11.
  • the end portion 27 of the holding member 12 is formed with a pair of cantilever-shaped holding portions 11 that can be elastically deformed by the slit 45, and the tongue piece portion 10 is formed in the cantilever-shaped holding portion 11.
  • the tongue piece portion 10 when the roller 5 passes through the tongue piece portion 10, the tongue piece portion 10 is brought into contact with one end surface 25 of the roller 5 by utilizing the bending of the elastic deformation of the cantilever-shaped holding portion 11.
  • the other end surface 25 of the roller 5 can be reliably pressed against the guide surface 31 of the casing 3.
  • the tongue piece portion 10 in addition to the bending of the cantilever-shaped holding portion 11, the tongue piece portion 10 is brought into contact with the end surface 25 of the roller 3 by the elastic force of the spring member 40, so that the roller 5 The other end surface 25 can be more reliably pressed against the guide surface 31 of the casing 3.
  • the roller 5 in the correct posture can be sent to the region of the load path 43 of the track path 14 by the above configuration.
  • the tip portion 33 of the holding member 12 is formed along the longitudinal direction between the pair of guide surfaces 32 of the cantilever-shaped holding portion 11, and is fitted into the concave locking groove 36 of the casing 3.
  • the holding member 12 has a mountain-shaped cross section orthogonal to the longitudinal direction, the mountain-shaped inclined surface 46 constitutes a guide surface 32 formed in a flat shape, and the mountain-shaped top 47 has a concave shape of the casing 3. It is fitted in the locking groove 36.
  • a plurality of mounting screw holes 42 are formed in the fixing member 13 so as to be spaced apart from each other in the longitudinal direction. Through holes are formed in the holding plate 7 and the casing 3 at positions corresponding to the mounting screw holes 42.
  • the holding plate 7 is fixed to the casing 3 by inserting the fixing bolt 41 into the through hole from the outside of the casing 3 and screwing it into the mounting screw hole 42. Since the mounting portion of the holding member 12 is fixed to the casing 3 via the metal frame member 18, it is possible to prevent the fastening force of the fixing bolt 41 from being directly transmitted to the holding member 12, and the holding member 12 is deformed. Can be suppressed. Further, the holding member 12 is formed with a spinning top mounting hole 51 into which the spinning top member 18 is inserted. In the top member 18, a convex portion, that is, a tip portion 34 (FIG. 5) having a shape corresponding to the mountain shape of the through hole 53 and the holding member 12 is formed corresponding to the tip portion 33 of the holding member 12. Further, the holding member 12 has a function of introducing the lubricant supplied from the oil supply hole 61 of the sleeve portion 65 of the casing 3 into the track path 14.
  • the tongue piece portion 10 is formed by a U-shaped slit 9 formed on the guide surface 32 of the cantilever-shaped holding portion 11.
  • the tongue piece portion 10 is formed in the shape of a cantilever that can be elastically deformed as described above.
  • the tongue piece portion 10 has a fixed end 17 (second fixed end) formed on the end portion 27 side of the holding member 12, that is, the direction change path 39 side of the end cap 4, and the load on the central side of the holding member 12, that is, the track path 14.
  • An arc-shaped free end 16 (second free end) is formed on the road 43 side.
  • a pair of inclined surfaces 37 (first inclined surface) and 38 (second inclined surface) are formed on both sides of the tongue piece portion 10 in the longitudinal direction.
  • the inclined surfaces 37 and 38 allow the tilted roller 5 to be gradually aligned so that the roller axis is orthogonal to the guide surface 31 of the casing 3.
  • the rollers 5 can be smoothly rolled and the roller shaft cores can be reliably aligned so as to be orthogonal to the guide surface 31 of the casing 3.
  • the posture of the roller 5 is gradually adjusted so that the axis thereof casings. It can be aligned so as to be orthogonal to the guide surface 31 of 3.
  • the roller 5 rolling from the load region can smoothly pass through the tongue piece portion 10.
  • the portion of the tongue piece portion 10 facing the guide surface 31 of the casing 3 is formed in a plane parallel to the guide surface 31, and the inclination angle of the inclined surface 37 on the direction change path 39 side is the inclination on the track path 14 side. It is formed to be smaller than the inclination angle of the surface 38.
  • the length of the inclined surface 37 in the longitudinal direction is formed substantially 1.2 times the diameter of the roller, and the length of the inclined surface 38 in the longitudinal direction is substantially formed by the roller. It is formed to be about 0.25 times the diameter.
  • the tongue piece portion 10 is formed at a position where the guide surface 31 of the casing 3 and the end surface 25 of the roller 3 hold down the position of the rotation axis. Further, the inclined surface 37 and the inclined surface 38 may have a curved cross-sectional shape in the longitudinal direction.
  • the tip portion 33 formed of a convex portion having a V-shaped cross section of the holding plate 7 is formed along the longitudinal direction between the upper and lower guide surfaces 32 of the holding plate 7, and as shown in FIG. 2, the upper and lower portions of the casing 3 are formed. It is fitted into a concave locking groove 36 having a V-shaped cross section formed along the longitudinal direction between the raceway surfaces 22 of the above.
  • the fixing bolt 41 is inserted into a through hole which is a mounting hole of the casing 3 and screwed into a mounting screw hole 42 formed in the fixing member 13 of the holding plate 7.
  • the holding plate 7 is fixed to the casing 3.
  • the slider 2 is formed to have a length that can be efficiently implemented in order to realize high rigidity and high accuracy.
  • the total length of the casing 3 is the width dimension of the track rail 1. It is formed to have a length corresponding to approximately four times that of.
  • FIG. 4 shows a perspective view showing a spring member 40 that enlarges the end portion 27 of the holding plate 7 attached to the casing 3.
  • a top mounting hole 51 is provided as a relief portion so that the cantilever-shaped holding portion 11 deformed by bending does not interfere with the fixing member 13. It is formed.
  • the holding member 12 receives a force in a direction of pushing the guide surface 32 from the end surface 25 of the roller 3, but is backed up by the fixing member 13 as shown in FIG.
  • the pair of cantilever-shaped holding portions 11 formed on both end portions 27 of the holding member 12 are elastically deformed in the direction in which the distance between the slits 45 becomes narrower. Further, the pair of cantilever-shaped holding portions 11 are formed so as to be elastically deformed independently. Further, by setting the slit 45 at the central position in the cross-sectional shape of the holding member 12, the tongue piece portion 10 can be reliably pressed against the end surface 25 of the roller 3.
  • the gap between the guide surface 31 of the casing 3 and the guide surface 32 of the holding member 12 is larger than the height (axis center length) of the roller 5. Since it is formed, a gap is formed between the guide surfaces 31 and 32 and the end surface 25 of the roller 5.
  • the tongue piece portion 10 formed on the guide surface 32 of the holding member 12 has a protruding guide surface 54.
  • the protruding guide surface 54 abuts on one end surface 25 of the roller 5 and presses the other end surface 25 of the roller 5 against the guide surface 31 of the casing 3.
  • the tongue piece portion 10 is formed at a position closer to the raceway surface 22 side of the casing 3, and is formed at a position facing the axial core position which is the center of the end surface 25 of the roller 5. Further, the tongue piece portion 10 has a function of pressing the center of the end surface 25 of the roller 5.
  • the rollers 5 whose shaft cores are tilted can be stably aligned so as to be in a posture orthogonal to the guide surface 31 of the casing 3. Therefore, when the roller 5 passes through the tongue piece portion 10, the two cantilever-shaped holding portions 11 bend and deform in the direction in which the slits 45 are narrowed while pressing the roller 5 against the guide surface 31 of the casing 3. do.
  • the holding member 12 is formed with a hole 63 penetrating the holding member 12 at the base of the slit 45 formed therein. As shown in FIGS. 4 to 7, a hole 63 is formed at the base of the slit 45, and the hole 63 is formed as a round hole cut out on the slit 45 side. The hole 63 is formed to have a round hole larger than the width of the slit 45, and prevents stress from concentrating on the base of the slit 45.
  • the pair of cantilever-shaped holding portions 11 formed by the slits 45 formed at the end portions 27 of the holding member 12 are formed so that the wall thickness at the root is thinned by the holes 63 when the holding member 12 is bent, and the elastic deformation is easily performed. Has been done.
  • the cantilever-shaped holding portion 11 is configured to depend on the elastic force of the spring member 40 incorporated in the end portion 27 of the holding member 12.
  • this linear motion guide unit is in a state in which the roller 5 is easily tilted because no load is applied to the roller 5 in the region of the direction change path 39 and the unloaded path 43N of the crowning portion 30. It has become.
  • the slider 2 moves so as to be slippery.
  • the tilted roller 5 enters the region of the load path 43, the roller 5 rolls while sliding on the track paths 21 and 22, so that friction increases, and the end faces 25 of the roller 5 push the guide surfaces 31 and 32 and slide. The resistance will increase and the problem of heat generation will occur.
  • One part 10 is provided.
  • the casing 3 is formed with a gently curved crowning portion 30 at both ends of the track path 14, the roller 5 is smoothly guided from the direction change path 39 to the track path 14. be able to.
  • the depth of the crowning portion 30 is formed, for example, to a depth corresponding to the amount of elastic deformation between the roller 5 and the raceway surface 21 and the raceway surface 22 caused by a load of half the basic static rated load on the slider 2.
  • the curved surface shape of the crowning portion 30 is formed with a single radius of curvature R along the longitudinal direction.
  • the crowning portion 30 is formed continuously with the flat portion of the raceway surface 22 of the casing 3 by simultaneous machining.
  • a curved surface-shaped R chamfered portion is formed on the end surface 26 of the casing 3 and the end portion of the crowning portion 30.
  • the roller 5 tilted in the direction change path 39 as indicated by reference numerals a and b gradually rolls along the first tilted surface 37 of the tongue piece portion 10 of the holding member 12.
  • the shaft cores are aligned so as to be orthogonal to the guide surface 31 of the casing 3.
  • the roller 5 is in a state as shown by the reference numerals c, is guided by the tongue piece portion 10, and is in a normal state as shown by the reference numerals d and e.
  • the posture of the tilted roller 5 is correct by bringing one end surface 25 of the roller 5 indicated by the reference numerals d and e into contact with the tongue piece portion 10 and pressing the other end surface 25 of the roller 5 against the guide surface 31 of the casing 3.
  • the posture is set, and the axis of the roller 5 can be aligned in the correct posture orthogonal to the guide surface 31 of the casing 3.
  • the roller 5 whose roller axis is aligned by the tongue piece portion 10 so that the roller axis is orthogonal to the guide surface 31 of the casing 3 then enters the region of the load path 43 of the track path 14, and is in a state as shown by reference numeral f. become.
  • the roller 5 is smoothly guided to roll.
  • the cantilever-shaped holding portion 11 is elastically deformed in the direction indicated by the reference numeral A, and the tongue piece portion. 10 is elastically deformed in the direction indicated by the reference numeral B, and each presses the end face 25 of the roller 5, so that the posture of the roller 5 is corrected.
  • the cantilever-shaped holding portion 11 is only elastically deformed in the direction indicated by the reference numeral A, and the end face 25 of the roller 5 is pressed by one piece.
  • the holding beam-shaped holding portion 11 is only elastically deformed, and the posture correction with respect to the roller 5 may be insufficient.
  • the linear motion guide unit according to the present invention is preferably applied to sliding parts of various devices such as semiconductor manufacturing devices, precision machines, and automobiles.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bearings For Parts Moving Linearly (AREA)
PCT/JP2021/006598 2020-02-28 2021-02-22 直動案内ユニット Ceased WO2021172265A1 (ja)

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JP2020033859A JP7219240B2 (ja) 2020-02-28 2020-02-28 直動案内ユニット
JP2020-033859 2020-02-28

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WO2021172265A1 true WO2021172265A1 (ja) 2021-09-02

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CN116263287A (zh) * 2021-12-13 2023-06-16 湖北美的电冰箱有限公司 导轨结构、翻盖板和家用电器

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Publication number Priority date Publication date Assignee Title
JP2023102377A (ja) * 2022-01-12 2023-07-25 日本トムソン株式会社 直動案内ユニット
JP7881411B2 (ja) * 2022-08-19 2026-06-29 日本トムソン株式会社 直動案内ユニット

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Publication number Priority date Publication date Assignee Title
JP2013217449A (ja) * 2012-04-09 2013-10-24 Thk Co Ltd 転がり案内装置
WO2018181928A1 (ja) * 2017-03-31 2018-10-04 ヒーハイスト精工株式会社 直動軸受およびハウジング付き直動軸受
JP2018173132A (ja) * 2017-03-31 2018-11-08 日本トムソン株式会社 直動案内ユニット

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ES2613883T3 (es) * 2012-07-13 2017-05-26 Thk Co., Ltd. Unidad de movimiento

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013217449A (ja) * 2012-04-09 2013-10-24 Thk Co Ltd 転がり案内装置
WO2018181928A1 (ja) * 2017-03-31 2018-10-04 ヒーハイスト精工株式会社 直動軸受およびハウジング付き直動軸受
JP2018173132A (ja) * 2017-03-31 2018-11-08 日本トムソン株式会社 直動案内ユニット

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116263287A (zh) * 2021-12-13 2023-06-16 湖北美的电冰箱有限公司 导轨结构、翻盖板和家用电器

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TW202132696A (zh) 2021-09-01
JP2021134903A (ja) 2021-09-13

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