WO2008013150A1 - Dispositif à vis et dispositif guide de mouvement - Google Patents

Dispositif à vis et dispositif guide de mouvement Download PDF

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Publication number
WO2008013150A1
WO2008013150A1 PCT/JP2007/064466 JP2007064466W WO2008013150A1 WO 2008013150 A1 WO2008013150 A1 WO 2008013150A1 JP 2007064466 W JP2007064466 W JP 2007064466W WO 2008013150 A1 WO2008013150 A1 WO 2008013150A1
Authority
WO
WIPO (PCT)
Prior art keywords
ball
holding member
rolling groove
screw shaft
holding
Prior art date
Application number
PCT/JP2007/064466
Other languages
English (en)
Japanese (ja)
Inventor
Hidekazu Michioka
Takeshi Yabe
Mitsuaki Homma
Shoichi Ishii
Hiroaki Mochizuki
Original Assignee
Thk 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 Thk Co., Ltd. filed Critical Thk Co., Ltd.
Priority to JP2008526764A priority Critical patent/JPWO2008013150A1/ja
Publication of WO2008013150A1 publication Critical patent/WO2008013150A1/fr

Links

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
    • 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
    • F16C29/045—Ball or roller bearings having rolling elements journaled in one of the moving parts
    • F16C29/046—Ball or roller bearings having rolling elements journaled in one of the moving parts with balls journaled in pockets
    • 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
    • F16H—GEARING
    • F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
    • F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
    • F16H25/20—Screw mechanisms
    • F16H25/22—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members
    • F16H25/2204—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members with balls
    • 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
    • F16H—GEARING
    • F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
    • F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
    • F16H25/20—Screw mechanisms
    • F16H25/24—Elements essential to such mechanisms, e.g. screws, nuts
    • F16H25/2409—Elements essential to such mechanisms, e.g. screws, nuts one of the threads being replaced by elements specially formed for engaging the screw or nut, e.g. pins, racks, toothed belts
    • 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
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/048—Type of gearings to be lubricated, cooled or heated
    • F16H57/0497—Screw mechanisms
    • 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
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/0406—Absorption elements for lubricants, e.g. oil felts

Definitions

  • the present invention relates to a screw device in which a cylinder moves in an axial direction when a screw shaft is rotated relative to a cylinder, and a movement in which a moving block moves linearly relative to a track rail.
  • the present invention relates to a guide device.
  • a ball screw in which a screw shaft groove and a nut groove are aligned, a plurality of balls are filled in the resulting spiral groove, and a return path is provided so that the ball circulates through the nut is well known. ing. By interposing a ball between the screw shaft and the nut, the frictional resistance when rotating the screw shaft with respect to the nut can be reduced, so ball screws have been put to practical use in various fields!
  • Linear guides are also well known as motion guide devices that guide a moving body in a linear motion.
  • a linear guide guides a moving body such as a table to a linear movement with respect to a fixed member such as a bed.
  • the linear guide is attached to the moving member while being slidably assembled to the track rail.
  • a moving block a moving block.
  • Ball rolling grooves are formed in the track rail along the longitudinal direction.
  • the moving block is formed with a load ball rolling groove facing the ball rolling groove of the track rail, and for circulating the balls arranged so as to allow rolling motion between the track rail and the moving block.
  • a ball return passage is provided.
  • Patent Document 1 discloses a ballpoint pen type screw device. As shown in Fig. 14, this screw device has one Threaded ball bearings 1 that hold the balls are arranged in groups of three at 120 degree intervals in the circumferential direction of the screw shaft 2, and a total of two sets of threaded ball bearings in the axial direction of the screw shaft 2 1 is placed.
  • the threaded ball bearing 1 holds a ball rotatably at the tip like a ballpoint pen.
  • a driver groove la is formed at the rear end of the threaded ball bearing 1. The side surface of the rear end portion of the threaded ball bearing 1 is threaded.
  • a linear guide with a simplified structure and manufacturing as shown in Fig. 15, the same document describes a cylindrical body 6 (moving linearly relative to a shaft 5 (corresponding to a track rail) ( (Corresponding to the moving block), three threaded ball bearings 1 are arranged in the axial direction of the shaft 5, and three threaded ball bearings 1 are arranged in a set at intervals of 120 degrees in the circumferential direction.
  • a linear guide is also disclosed. When the cylindrical body 6 is moved relative to the shaft 5 in the axial direction, it rolls on the ball force shaft 5 held by the threaded ball bearing 1.
  • Patent Document 1 Japanese Utility Model Publication No. 57-73422 (see Fig. 3 and Fig. 6)
  • Patent Document 2 JP-A-10-184683
  • the present invention provides a screw device and a motion guide device that can be lubricated in a ballpoint pen type screw device and a motion guide device while maintaining space saving and simplifying the structure and manufacturing. With the goal.
  • the screw device rotates the screw shaft and moves the nut in the axial direction.
  • a load in the axial direction is necessarily applied to the nut. It is desirable to be able to receive the axial load not only with normal ball screws that arrange multiple balls, but also with ballpoint pen type screw devices. Accordingly, another object of the present invention is to provide a ballpoint pen type screw device capable of receiving an axial load.
  • the invention according to claim 1 includes a screw shaft in which a spiral ball rolling groove is formed on an outer peripheral surface, a cylindrical body fitted around the screw shaft, and the cylindrical body
  • the ball is mounted in a plurality of mounting holes that are opened in the circumferential direction when viewed from the axial direction thereof, and the ball that contacts the ball rolling groove can be rotationally moved with a part of the ball exposed, and the rotation of the ball
  • a ball holding member that holds the ball so as to restrain movement other than movement.
  • the ball holding member includes a holding recess with which the ball abuts, and a cavity connected to the holding recess.
  • a lubricant received in the cavity, and the ball receives a compressive load between the ball rolling groove of the screw shaft and the holding recess of the ball holding member, and the cylinder Body is against the screw shaft As the ball rotates relative to the axis of the screw shaft, the ball rolls on the ball rolling groove of the screw shaft and is accommodated in the cavity by the rolling motion of the ball.
  • the screw device is characterized in that the lubricant is applied to the ball rolling groove.
  • the invention according to claim 2 is the screw device according to claim 1, wherein the cylindrical body has a plurality of mounting holes extending in a radial direction of the screw shaft, and the ball holding member.
  • a holding member main body formed in a cylindrical shape so as to have the hollow portion in the central portion, and a lid for closing the base end of the holding member main body so that the lubricant accommodated in the hollow portion does not leak.
  • the holding recess is a cone whose diameter increases from the cavity toward the tip.
  • the holding member main body is formed in a shape, and the distal end portion of the holding member main body is caulked so that the diameter contracts toward the center, and the caulking end portion of the holding member main body is interposed between the holding concave portion and the holding concave portion.
  • the ball is sandwiched.
  • the invention according to claim 3 is the screw device according to claim 1, wherein the cylindrical body is provided with the mounting hole extending in a tangential direction of the screw shaft, and the ball holding member includes an inner portion.
  • the holding recess is formed on the bottom surface inside the box-shaped ball holding member, the contact point (P) between the ball and the holding recess, and The contact angle line (L1) connecting the center (C) of the ball is directed in the radial direction of the screw shaft, and the reaction (F) in which the holding recess compresses the ball is the box-shaped ball holding member. It is transmitted to the cylinder through a bottom wall.
  • the invention according to claim 4 is arranged so as to straddle the track rail, the track rail having a ball rolling groove extending along the longitudinal direction, and moves along the track rail.
  • a ball-shaped moving block and the ball that is mounted in the mounting hole of the moving block and that makes contact with the ball rolling groove with a part of the ball exposed can rotate, and other than the rotation of the ball
  • the motion guide device is characterized in that the lubricant is applied to the ball rolling groove.
  • the invention according to claim 5 is the movement guide device according to claim 4, wherein the ball holding member is formed in a cylindrical shape so as to have the hollow portion in a central portion; A lid that closes the base end of the holding member main body so that the lubricant contained in the hollow portion leaks! /, And the holding recess has a cone whose diameter increases from the cavity portion toward the tip end.
  • the holding member main body has a tip that is formed in a shape with a diameter toward the center. And the ball is sandwiched between the crimped tip of the holding member and the holding recess.
  • the invention according to claim 6 is the movement guide device according to claim 4, wherein the ball holding member is formed in a box shape having the hollow portion therein, and the holding recess is formed in a box shape. It is formed on the bottom surface inside the ball holding member, and the reaction in which the holding recess compresses the ball is transmitted to the moving block through the bottom wall of the box-shaped ball holding member.
  • the ball can be held at the tip of the ball holding member and the lubricant can be supplied to the ball.
  • the reaction when the holding recess compresses the ball is transmitted to the cylindrical body close to the rigid body via the bottom wall of the box-shaped ball holding member. For this reason, a large compressive load can be applied to the ball, and a screw device capable of applying a large load is obtained.
  • the ball can be held at the tip of the ball holding member and the lubricant can be supplied to the ball.
  • the reaction when the holding recess compresses the ball is transmitted to the moving body via the bottom wall of the box-shaped ball holding member. For this reason, a large compressive load can be applied to the ball, and a motion guide device that can apply a large load is obtained.
  • FIG. 1 is a perspective view of a ballpoint pen type screw device according to a first embodiment of the present invention.
  • FIG. 5 is a front view of a screw device according to a second embodiment of the present invention.
  • FIG. 8 Cross-sectional view of ball holding member (shows another example of ball rolling groove)
  • FIG. 9 is a sectional view showing a screw device according to a third embodiment of the present invention (cross-sectional view along the axis of the screw shaft).
  • FIG. 10 Cross-sectional view of the holding recess of the top ((A) in the figure shows a cross-sectional view along the axis of the screw shaft, (B) in the figure shows a cross-sectional view along the direction perpendicular to the axis of the screw shaft, (C) is the bottom view of the holding recess.
  • FIG. 12 is a front view of a motion guide device (linear guide) according to the first embodiment of the present invention.
  • FIG. 13 is a front view of a motion guide device (linear guide) according to the second embodiment of the present invention.
  • a diagram showing a conventional ballpoint pen type screw device ((A) in the figure shows a cross-sectional view along the axis of the screw shaft, and (B) in the figure shows a cross-sectional view perpendicular to the axis of the screw shaft)
  • FIG. 15 is a view showing a conventional ballpoint pen type linear guide ((A) in the figure shows a cross-sectional view along the axis of the shaft, and (B) in FIG. 15 shows a cross-sectional view perpendicular to the axis of the shaft)
  • FIG. 1 and 2 show a ballpoint pen type screw device in a first embodiment of the present invention.
  • 1 shows a perspective view
  • FIG. 2 shows a front view.
  • a spiral ball rolling groove 11a having a predetermined lead is processed on the outer periphery of the screw shaft 11.
  • the cross-sectional shape of the ball rolling groove 11a is the force formed in the circular arc arch groove consisting of a single arc so as to contact the ball at one point, and the two arcs so as to contact the ball at two points. Formed in a combined Gothic arch groove. In this embodiment, it is formed in a circular one arch groove shape. Since the ball 14 rolls on the ball rolling groove 11a of the screw shaft 11, the surface of the ball rolling groove 11a is hardened.
  • a cylindrical body 12 is fitted around the screw shaft 11 with a clearance.
  • the cylindrical body 12 has an equal angle in the circumferential direction, for example, 120 degrees, and a set of three mounting holes 12a (see FIG. 2). Can be opened.
  • the mounting hole 12a penetrates the cylindrical body 12 in the radial direction.
  • the positions of the three mounting holes 12a are shifted in the axial direction so as to face the spiral ball rolling groove 11a.
  • three sets of mounting holes 12a can be opened, for example, in three sets with the same pitch in the axial direction.
  • FIG. 3 shows a cross-sectional view of the ball holding member 13.
  • the ball holding member 13 holds the ball 14 with its part exposed at the tip like a ballpoint pen. That is, the ball 14 held at the tip of the ball holding member 13 can only rotate and is restricted from movements other than the rotational movement.
  • the ball holding member 13 is formed in a hollow and substantially cylindrical shape, and includes a metal holding member main body 15 that holds the ball 14 at the tip, and a lid 28 that closes the upper end of the holding member main body 15.
  • the holding member main body 15 has a hollow portion 16 at the center portion and a conical holding concave portion 17 whose diameter increases from the hollow portion 16 toward the tip.
  • a tapered portion 18 whose diameter is narrowed toward the tip is formed on the outer periphery of the holding member main body 15. That is, the inner circumference of the holding member main body 15 is widened toward the tip by the holding recess 17, and the outer circumference of the holding member main body 15 is narrowed toward the tip by the tapered portion 18.
  • the tip 19 of the holding member main body 15 is thin.
  • the thin-walled tip 19 is crimped so that its diameter is narrowed toward the center, like a ballpoint pen.
  • the ball 14 is held between the tip portion 19 and the holding recess portion 17 that have been pressed, and the tip portion 19 that has been pressed and pressed prevents the ball 14 from falling off.
  • the cavity 16 of the holding member body 15 is filled with a lubricant 20.
  • the lubricant may be stored as it is in the cavity so that the liquid is stored in the tank, or the lubricant may be impregnated in a fiber body such as felt, and the fiber body may be stored in the cavity 16.
  • the back side of the ball 14 (upper side in this figure) is filled with lubricant! /, And the lubricant 20 is always applied to the back side of the ball 14.
  • the lid 28 is formed in a disc shape, and a male screw is processed on the outer periphery thereof.
  • a female screw that is screwed into the male screw of the lid 28 is processed.
  • the taper portion 18 on the outer periphery of the holding member main body 15 contacts the taper portion 12al on the inner periphery of the mounting hole 12a. contact
  • the holding member main body 15 is fixed to the cylindrical body 12. In this state, the ball 14 is sandwiched between the ball rolling groove 11a and the holding recess 17 of the ball holding member 13, and receives a compressive load therebetween.
  • the ball 14 and the holding recess 17 are in contact at two points across the top of the ball 14.
  • the screw device rotates the screw shaft 11 to move the cylinder 12 in the axial direction, and the cylinder 12 inevitably receives an axial load.
  • the ballpoint pen type screw device can receive the axial load.
  • An axial load can be applied by the holding recess 17 and the ball 14 coming into contact at two points.
  • FIG. 4 shows another example of the ball rolling groove 1 la.
  • the ball rolling groove 1 la has a V-shaped cross section, and the ball rolling groove 11 a and the ball 14 are in contact at two points. It is difficult for the ball 14 to move in the axial direction with respect to the ball rolling groove 1 l a! /, And the structure becomes! /, So a load in the axial direction can be applied more.
  • FIG. 5 shows a screw device according to the second embodiment of the present invention. Since the screw shaft 11 is the same as that of the above embodiment, the same reference numerals are given and the description thereof is omitted.
  • a set of mounting holes 21a is formed in the cylindrical body 21 at three equal intervals in the circumferential direction, for example, at intervals of 120 degrees.
  • the mounting hole 21a extends in the tangential direction of the screw shaft 11.
  • the cross-sectional shape of the mounting hole 21a is, for example, a rectangular shape.
  • the positions of the three mounting holes 21a are shifted in the axial direction so as to face the spiral ball rolling groove 11a.
  • One set of mounting holes 2 la can be opened, for example, in three sets with an equal pitch in the axial direction.
  • the mounting hole 21a is provided with a box-shaped ball holding member 23 adapted to the shape of the mounting hole 21a. Worn. When viewed from the axial direction of the screw shaft 11, three balls 22 are arranged on the ball rolling groove 11 a of the screw shaft 11 at intervals of 120 degrees in the circumferential direction. The ball 22 is held with the ball holding member 23 partially exposed.
  • FIG. 6 is a perspective view of the ball holding member 23.
  • the box-shaped ball holding member 23 includes a bottom wall and a metal box body 24 composed of three side walls surrounding the bottom wall, an upper lid 25 covering the top of the box body 24, and side portions of the box body 24. It consists of a side lid 26 that closes, and force. Inside the ball holding member 23 constituted by the box body 24, the upper lid 25, and the side lid 26, a substantially cubic hollow portion 27 is formed which is elongated in the left-right direction in the figure.
  • a ball 22 is disposed at one end of the cavity 27 in the longitudinal direction. The ball 22 is held in a state where movements other than rotational movement are restricted.
  • a holding recess 29 that matches the outer shape of the ball 22 is formed on the bottom surface inside the box body 24 (the upper surface of the bottom wall 24a), and the side wall 24b of the box body 24 matches the outer shape of the ball 22.
  • a side wall recess is formed, and an upper wall recess 24d matching the outer shape of the ball 22 is formed on the upper wall 24c of the box body 24.
  • an upper lid recess 25 a that matches the outer shape of the ball 22 is formed at the end of the upper lid 25.
  • Lubricants 30 are accommodated in the hollow portions 27 other than the portion where the balls 22 are arranged.
  • the lubricant 30 may be filled in the cavity 27 as a liquid, or may be accommodated in the cavity while being absorbed by a fiber such as felt.
  • the side lid 26 is formed with a positioning projection 26a projecting toward the cavity 27. After injecting the lubricant into the cavity 27, the side lid 26 is covered.
  • FIG. 7 shows a cross-sectional view of the ball holding member 23.
  • the ball 22 comes into contact with the holding recess 29.
  • a contact angle line L1 connecting the contact point P between the ball 22 and the holding recess 29 and the center C of the ball 22 faces the radial direction of the screw shaft 11.
  • the ball 22 receives a compressive load between the holding recess 29 and the ball rolling groove 11a.
  • the reaction F when the holding recess 29 compresses the ball 22 is transmitted to the bottom wall 24a of the box-shaped ball holding member 23.
  • the ball holding member 23 is inserted into the mounting hole 21a of the cylinder 21. Since it is mounted, this reaction F is finally transmitted to the cylinder 21 through the bottom wall 24a of the ball holding member 23.
  • the box-shaped ball holding member 23 Since the reaction F is transmitted to the cylindrical body 21 close to the rigid body via the bottom wall 24a and the contact area between the holding recess 29 and the ball 22 can be increased, the box-shaped ball holding member 23 is large. There is an advantage that it can receive a load. Further, the box-shaped ball holding member 23 restrains the ball 22 with the two members of the box main body 24 and the upper lid 25 placed on the box main body 24, so that it does not require a caulking step. For this reason, the manufacture of the ball holding member 23 is facilitated.
  • the ball 22 is sandwiched between the ball rolling groove 11a and the holding recess 29 of the ball holding member 23, and receives a compressive load therebetween.
  • the screw shaft 11 is rotated relative to the cylinder 21, the ball 22 moves on the ball rolling groove 11a while receiving a compressive load between the holding recess 29 and the ball rolling groove 11a.
  • the frictional force between the ball 22 and the ball rolling groove 11a is larger than the frictional force between the ball 22 and the holding recess 29. For this reason, the ball 22 sandwiched between the holding recess 29 and the ball rolling groove 11 a rolls on the ball rolling groove 11 a and slides on the holding recess 29.
  • the lubricant 30 stored on the side surface of the ball 22 is gradually cut out and applied to the ball rolling groove 11a.
  • FIG. 8 shows another example of the ball rolling groove 11a.
  • the ball rolling groove 1 la has a V-shaped cross section, and the ball rolling groove 11 a and the ball 22 are in contact at two points. It is difficult for the ball 22 to move in the axial direction with respect to the ball rolling groove 1 l a! /, And the structure becomes! /, So a load in the axial direction can be applied more.
  • FIG. 9 shows a screw device according to a third embodiment of the present invention.
  • the configurations of the screw shaft 11 and the cylinder 12 are the same as those of the screw device in the first embodiment shown in FIG.
  • a spiral ball rolling groove 1 la is formed on the outer periphery of the screw shaft 11.
  • the cross-sectional shape of the ball rolling groove 11a is V-shaped, and the ball 32 and the ball rolling groove 11a are in contact at two points.
  • the cylindrical body 12 is provided with a set of three mounting holes 12a at equal intervals in the circumferential direction.
  • the mounting hole 12a penetrates the cylindrical body 12 in the radial direction.
  • a ball holding member 37 is mounted in the mounting hole 12a.
  • the ball holding member 37 is formed with a base 33 that is coupled to the mounting hole 12a and a holding recess 34 that is in contact with the ball 32, and is slidable in the radial direction of the screw shaft 11 with respect to the base 33. And a spring 38 that is interposed between the piece 35 and the base 33 and urges the ball 32 fitted in the holding recess 34 to the ball rolling groove 11a.
  • a male screw is processed on the outer periphery of the base 33, and this male screw is screwed into the female screw of the mounting hole 12a.
  • a hole for slidably guiding the shaft portion 35a of the top 35 is formed.
  • the top 35 has a cylindrical top main body 35b in which a holding recess 34 that contacts the ball 32 is formed at the lower end, and a shaft portion 35a that is integrally provided at the upper end of the top main body 35b.
  • FIG. 10 shows a cross-sectional view of the holding recess of the frame.
  • the holding recess 34 is formed in a Gothic arch groove shape consisting of a pair of arcs so that the cross-sectional shape along the axis of the screw shaft 11 is in contact with the ball 32 at two points.
  • the holding recess 34 has a cross-sectional shape perpendicular to the axis of the screw shaft 11, more precisely along the lead angle direction of the spiral ball rolling groove 11 a of the screw shaft 11.
  • a cross-sectional shape is formed into a circular arcuate groove shape consisting of a single arc slightly larger than the radius of the ball 32 so that the ball can be restrained.
  • the holding recess 34 has a combination of a Gothic arch thread groove shape and a circular arcuate groove shape, and the holding recess 34 has a ridge line 36 along the spiral ball rolling groove 1 la. Is formed.
  • the cross-sectional shape of the holding recess 34 along the axis of the screw shaft 11 is formed in a Gothic arch groove shape, and the holding recess 34 and the ball 32 are in contact at two points, so that the screw device is loaded in the axial direction. Can receive power S. Since the cross-sectional shape of the holding recess 34 perpendicular to the axis of the screw shaft 11 is formed in a circular one arch groove shape, movement other than the rotational motion of the ball 32 can be restricted in the holding recess 34.
  • the ball 32 is sandwiched between the holding recess 34 of the top 35 and the ball rolling groove 11a. Between these, the ball 32 is subjected to a compressive load by the spring 38.
  • the frictional force between the ball 32 and the ball rolling groove 11 a is larger than the frictional force between the ball 32 and the holding recess 34.
  • the ball 32 rolls and moves on the ball rolling groove 11a of the screw shaft 11.
  • a space for accommodating a lubricant is provided in the top 35, and the ball 3 The accommodated lubricant may be cut out by rolling 2 on the ball rolling groove 11a.
  • the screw device is fitted around the screw shaft 11 in which the spiral ball rolling groove 11 a is formed on the outer peripheral surface, and around the screw shaft 11.
  • a ball holding member 37 that holds the ball 32 so as to constrain the movement of the ball 32 other than the rotation movement of the ball 32.
  • the holding recess 34 has an abutment, and the cross-sectional shape of the holding recess 34 along the axis of the screw shaft 11 is formed in the shape of a Gothic arch groove consisting of two arcs so as to contact the ball 32 at two points.
  • S Ball 11 comes into contact with ball rolling groove 11a of screw shaft 11
  • the ball 32 rolls on the screw shaft 11 as the cylinder 12 rotates relative to the screw shaft 11 around the axis of the screw shaft 11 by receiving a compressive load with the holding recess 34. It rolls on the groove 11a and slips in the holding recess 34.
  • a ballpoint pen type screw device capable of applying a load in the axial direction of the screw shaft 11 is obtained.
  • the cross-sectional shape of the holding recess 34 perpendicular to the axis of the screw shaft 11 is a circular one arch groove shape formed of a single arc so that the ball 32 can be restrained. As a result, the ball 32 can be restrained so as to allow only rotational movement within the holding recess 34.
  • the ball holding member 37 includes a base 33 coupled to the cylindrical body 12, a holding member main body 35 that is slidable in the radial direction of the screw shaft 11 with respect to the base 33, and a holding recess 34 is formed. And a spring 38 that is interposed between the member body 35 and the base portion 33 and biases the ball 32 fitted in the holding recess 34 to the ball rolling groove 11a. As a result, a substantially constant compressive load can be applied to the ball 32 by the biasing force of the spring 38.
  • FIG. 12 shows a motion guide device (linear guide) in the first embodiment of the present invention.
  • the motion guide device is composed of a track rail 41 that extends elongated and a moving block 42 that slides along the track rail 41.
  • the track rail 41 has a rectangular cross section and is elongated and linearly extended. On the side surface of the track rail 41, a ball rolling groove 41a extending along the longitudinal direction is formed. Ball rolling groove 41a
  • the cross-sectional shape is the force formed in the circular search groove consisting of a single arc so as to contact the ball 14 at one point, and the Gothic arch groove combining two arcs so as to contact the ball 14 at two points. It is formed. Since the ball 14 rolls on the ball rolling groove 41a of the track rail 41, the surface of the ball rolling groove 41a is hardened.
  • the moving block 42 is formed in a bowl shape so as to straddle the track rail 41. That is, the moving block 42 includes a base portion 42a that faces the upper surface of the track rail 41, and a pair of side wall portions 42b that face the side surface of the track rail 41 and hang down in the vertical direction from the base portion 42a. Each of the pair of left and right side wall portions 42b is provided with a mounting hole 42c penetrating the side wall portion 42b in the left-right direction so as to face the ball rolling groove 41a. A pair of left and right mounting holes 42 2 c are provided in a plurality of sets with their positions shifted in the axial direction of the track rail 41.
  • a ball holding member 13 (see FIG. 3) having the same configuration as the ball holding member used in the screw device of the first embodiment is mounted in the mounting hole 42c.
  • the bowlet holding member 13 is formed in a hollow, substantially cylindrical shape, and is made of a metal holding member main body 15 that holds the ball 14 at the tip, and a lid 28 that closes the upper end of the holding member main body 15.
  • the holding member body 15 has a hollow portion 16 at the center portion and a conical holding concave portion 17 whose diameter increases from the hollow portion 16 toward the tip.
  • the thin-walled tip 19 is caulked so that its diameter decreases toward the center like a ballpoint pen.
  • the ball 14 is held between the tip 19 and the holding recess 17 where the force is applied.
  • the ball 14 is sandwiched between the ball rolling groove 41a and the holding recess 17 of the ball holding member 13, and receives a compressive load therebetween.
  • the moving block 42 is linearly moved relative to the track rail 41, the ball 14 rolls on the ball rolling groove 41a while receiving a compressive load between the holding recess 17 and the ball rolling groove 41a.
  • the lubricant 20 stored on the back side of the ball 14 is gradually cut out and applied to the ball rolling groove 4 la.
  • FIG. 13 shows a motion guide device (linear guide) in the second embodiment of the present invention.
  • the motion guide device includes a track rail 41 that extends elongated and a moving block 42 that slides along the track rail 41.
  • the track rail 41 has a rectangular cross section and is elongated in a straight line. Side of track rail 41 Is formed with a ball rolling groove 41a extending along the longitudinal direction.
  • the moving block 42 is formed in a bowl shape so as to straddle the track rail 41. That is, the moving block 42 includes a base portion 42a that faces the upper surface of the track rail 41, and a pair of side wall portions 42b that face the side surface of the track rail 41 and hang down in the vertical direction from the base portion 42a. Each of the pair of left and right side wall portions 42b is provided with a mounting hole 42c extending vertically so as to contact the ball rolling groove 41a. A pair of left and right mounting holes 42c are provided in a plurality of sets with their positions shifted in the axial direction of the track rail 41.
  • the shape of the moving block 42 is not limited to the bowl shape.
  • the moving block 42 may be configured in an L shape only from the base portion 42a and one side wall portion 42b, and it does not have a base portion! It may be composed of only one side wall portion 42b.
  • the mounting hole 42c is mounted with a ball holding member 23 (see FIGS. 6 and 7) having the same configuration as the ball holding member used in the screw device of the second embodiment.
  • the box-shaped ball holding member 23 includes a metal box body 24 having a bottom wall 24a and three side walls 24b, an upper lid 25 covering the top of the box body 24, and a box body 24.
  • a side lid 26 that closes the sides and force is also constructed.
  • a substantially cubic cavity 27 is formed which extends in the left-right direction in the figure.
  • a ball 22 is disposed at one end of the cavity 27.
  • the ball 22 After placing the ball 22 in the holding recess 29 of the box body 24 and then covering the upper lid 25, the ball 22 can only rotate with respect to the upper lid 25 and the box body 24 with a part of the ball 22 exposed.
  • Restrained by Lubricants 30 (see FIG. 7) are accommodated in the regions other than the portion where the ball 22 of the hollow portion 27 is disposed. After filling the cavity 27 with the lubricant 30, the side lid 26 is put on.
  • the contact angle line L1 connecting the contact point between the ball 22 and the holding recess 29 and the center of the ball 22 faces in the horizontal direction (see FIG. 13).
  • the ball 22 receives a compressive load between the holding recess 29 and the ball rolling groove 41a.
  • the reaction F when the holding recess 29 compresses the ball is transmitted to the bottom wall 24a of the box-shaped ball holding member 23. Since the ball holding member 23 is mounted in the mounting hole 42c of the moving block 42, this reaction F is finally transmitted to the moving block 42 via the bottom wall 24a of the ball holding member 23.
  • the ball 22 is sandwiched between the ball rolling groove 41a and the holding recess 29 of the ball holding member 23, and receives a compressive load therebetween.
  • the moving block 42 is moved relative to the track rail 41, the ball 22 rolls on the ball rolling groove 41a while receiving a compressive load between the holding recess 29 and the ball rolling groove 41a.
  • the lubricant 30 stored in the cavity 27 is gradually cut out and applied to the ball rolling groove 41a.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transmission Devices (AREA)

Abstract

Dispositif à vis d'un stylo de type à pointe bille, dans lequel la lubrification est possible bien que le dispositif présente une taille réduite. Le dispositif à vis comporte un arbre (11) à vis présentant une rainure hélicoïdale de roulement de bille formée sur la surface périphérique externe de l'arbre à vis, un corps (12) tubulaire arrangé autour de la périphérie de l'arbre à vis (11), et un élément (13) de maintien de la bille fixé au corps (13) tubulaire. L'élément (13) de maintien de bille maintient une bille (14) de telle manière que la bille (14) puisse tourner et qu'un mouvement de la bille (14) autre que sa rotation soit limité. L'élément (13) de maintien de la bille comprend un creux (17) de maintien avec lequel la bille (14) est en contact, une cavité (16) reliée au creux (17) de maintien, et un lubrifiant (20) disposé dans la cavité (16). Lorsque le corps (12) tubulaire tourne par rapport à l'arbre (11) à vis, la bille (14) roule sur la rainure (11a) de roulement de bille dans l'arbre (11) à vis, la bille (14) étant maintenue par l'élément (13) de maintien de bille.
PCT/JP2007/064466 2006-07-24 2007-07-23 Dispositif à vis et dispositif guide de mouvement WO2008013150A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2008526764A JPWO2008013150A1 (ja) 2006-07-24 2007-07-23 ねじ装置及び運動案内装置

Applications Claiming Priority (2)

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JP2006-200844 2006-07-24
JP2006200844 2006-07-24

Publications (1)

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WO2008013150A1 true WO2008013150A1 (fr) 2008-01-31

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WO (1) WO2008013150A1 (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101088592B1 (ko) * 2009-03-04 2011-12-06 양원준 샤프트레일형 엘엠가이드 구조
JP5605875B1 (ja) * 2013-10-09 2014-10-15 英治 川西 転がりナット装置
US20190078681A1 (en) * 2017-09-08 2019-03-14 Hiwin Technologies Corp. Lubricatable ball screw device
KR20200035532A (ko) * 2018-09-27 2020-04-06 현대모비스 주식회사 브레이크 부스터
WO2020240743A1 (fr) * 2019-05-29 2020-12-03 逸人 水野 Mécanisme à vis sphérique et dispositif à mouvement linéaire
US10981748B2 (en) 2017-11-15 2021-04-20 Airbus Defence And Space S.A.U. Frictionless service carriage system
CN117404457A (zh) * 2023-12-15 2024-01-16 常州瑞倍特自动化设备有限公司 智能型电动执行器
EP4343173A1 (fr) * 2022-09-24 2024-03-27 Zhejiang Dingli Machinery Co., LTD. Actionneur linéaire avec écrou de sécurité de type à contact, et plateforme de travail élévatrice
US12084106B2 (en) * 2022-03-16 2024-09-10 Zf Automotive Germany Gmbh Steering column for a vehicle

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JPS5773422U (fr) * 1980-10-08 1982-05-06
JPS57179463A (en) * 1981-04-28 1982-11-05 Sansho:Kk Non-circulating type ball screw
JPS62101913A (ja) * 1985-10-28 1987-05-12 Nippon Thompson Co Ltd 自動調心小形ボ−ルスプライン軸受
JPH0248611U (fr) * 1988-09-30 1990-04-04
JPH11201256A (ja) * 1998-01-09 1999-07-27 Smc Corp アクチュエータ
JP2000145771A (ja) * 1998-11-06 2000-05-26 Nippon Thompson Co Ltd 直動案内ユニット

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5773422U (fr) * 1980-10-08 1982-05-06
JPS57179463A (en) * 1981-04-28 1982-11-05 Sansho:Kk Non-circulating type ball screw
JPS62101913A (ja) * 1985-10-28 1987-05-12 Nippon Thompson Co Ltd 自動調心小形ボ−ルスプライン軸受
JPH0248611U (fr) * 1988-09-30 1990-04-04
JPH11201256A (ja) * 1998-01-09 1999-07-27 Smc Corp アクチュエータ
JP2000145771A (ja) * 1998-11-06 2000-05-26 Nippon Thompson Co Ltd 直動案内ユニット

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101088592B1 (ko) * 2009-03-04 2011-12-06 양원준 샤프트레일형 엘엠가이드 구조
JP5605875B1 (ja) * 2013-10-09 2014-10-15 英治 川西 転がりナット装置
JP2015075167A (ja) * 2013-10-09 2015-04-20 英治 川西 転がりナット装置
US20190078681A1 (en) * 2017-09-08 2019-03-14 Hiwin Technologies Corp. Lubricatable ball screw device
US10619672B2 (en) * 2017-09-08 2020-04-14 Hiwin Technologies Corp. Lubricatable ball spline device
US10981748B2 (en) 2017-11-15 2021-04-20 Airbus Defence And Space S.A.U. Frictionless service carriage system
KR102635780B1 (ko) * 2018-09-27 2024-02-08 현대모비스 주식회사 브레이크 부스터
KR20200035532A (ko) * 2018-09-27 2020-04-06 현대모비스 주식회사 브레이크 부스터
WO2020240743A1 (fr) * 2019-05-29 2020-12-03 逸人 水野 Mécanisme à vis sphérique et dispositif à mouvement linéaire
US11808329B2 (en) 2019-05-29 2023-11-07 Hayato Mizuno Ball screw mechanism and linear moving device
US12084106B2 (en) * 2022-03-16 2024-09-10 Zf Automotive Germany Gmbh Steering column for a vehicle
EP4343173A1 (fr) * 2022-09-24 2024-03-27 Zhejiang Dingli Machinery Co., LTD. Actionneur linéaire avec écrou de sécurité de type à contact, et plateforme de travail élévatrice
CN117404457A (zh) * 2023-12-15 2024-01-16 常州瑞倍特自动化设备有限公司 智能型电动执行器
CN117404457B (zh) * 2023-12-15 2024-02-20 常州瑞倍特自动化设备有限公司 智能型电动执行器

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