WO2016035563A1 - Dispositif de vis à billes - Google Patents

Dispositif de vis à billes Download PDF

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Publication number
WO2016035563A1
WO2016035563A1 PCT/JP2015/073409 JP2015073409W WO2016035563A1 WO 2016035563 A1 WO2016035563 A1 WO 2016035563A1 JP 2015073409 W JP2015073409 W JP 2015073409W WO 2016035563 A1 WO2016035563 A1 WO 2016035563A1
Authority
WO
WIPO (PCT)
Prior art keywords
nut
seal member
screw shaft
lubricant
peripheral surface
Prior art date
Application number
PCT/JP2015/073409
Other languages
English (en)
Japanese (ja)
Inventor
渓太郎 岡
大介 丸山
Original Assignee
日本精工株式会社
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 日本精工株式会社 filed Critical 日本精工株式会社
Publication of WO2016035563A1 publication Critical patent/WO2016035563A1/fr

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    • 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
    • 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
    • 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
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings

Definitions

  • the present invention relates to a ball screw device used as a machine element such as a semiconductor manufacturing apparatus, a compression molding machine, an injection molding machine, or a general conveying apparatus.
  • a ball screw device is known as a mechanism for converting rotational motion into linear motion.
  • the ball screw device has a linear screw shaft having a spiral ball rolling groove formed on the outer peripheral surface, and a spiral ball rolling groove facing the ball rolling groove of the screw shaft on the inner peripheral surface.
  • the nut is fitted on the outer peripheral side of the screw shaft through a number of balls interposed between both ball rolling grooves, and is rotated in the axial direction of the screw shaft by rotating the screw shaft. It can be moved.
  • ⁇ Lubrication of ball screw devices is often performed with lubricating oil or grease to achieve smooth operation and durability.
  • a lubricant having a high viscosity such as grease tends to accumulate in the lubricating portion around the ball, which is a rolling element, so that maintenance is facilitated. Therefore, in the lubrication of the ball screw device, the ratio of grease lubrication is increasing.
  • Japanese Patent Application Laid-Open No. 2000-213619 describes a ball nut in which a flange is provided in the axial center of the ball nut body, and a grease oil supply port communicating with a grease outlet opening inside the ball nut is provided on the flange. Has been.
  • Grease deteriorates with use.
  • the grease also accumulates fine wear powder that is generated when the ball rolls on the screw shaft and the ball rolling groove of the nut. While further improvement in the durability of ball screw devices is required, if lubrication is performed with such deteriorated grease or grease with accumulated fine wear powder, the ball rolling groove of the screw shaft and nut, Wear will be accelerated. In response to this, measures have been taken such as continuous lubrication, that is, continuous supply of new grease to the ball screw device. For example, in Japanese Patent Application Laid-Open No.
  • the present invention has been made in view of such a situation, and provides a ball screw device capable of spreading a supplied lubricant such as grease to every corner between a screw shaft and a nut. Objective.
  • a ball screw device includes a screw shaft that extends in a straight line and has a spiral groove formed on an outer peripheral surface thereof, and an inner peripheral groove that faces the spiral groove.
  • a nut fitted on the screw shaft through a plurality of balls disposed between the groove and the spiral groove of the screw shaft, the screw shaft and the nut In the ball screw device in which the nut is provided with a lubricant supply path having an opening on the inner peripheral surface of the nut, which is an outlet of the lubricant to be supplied, in order to supply the lubricant between the openings.
  • the nut is disposed on one side in the axial direction, and both ends of the screw hole of the nut are discharge ports for the lubricant supplied between the screw shaft and the nut, respectively, and the one closer to the opening The lubricant is discharged to the discharge port more than the discharge port far from the opening.
  • the ring-shaped first sealing member for hardly is provided.
  • the first seal member has an inner diameter side portion that is in contact with an outer peripheral surface of the screw shaft, and a ring located at a discharge port far from the opening.
  • a second seal member is provided, and the inner diameter side portion of the second seal member is in contact with the outer peripheral surface of the screw shaft, and the adhesion force to the outer peripheral surface of the screw shaft is higher than that of the first seal member. Is small.
  • the first seal member has an inner diameter side portion that is in contact with an outer peripheral surface of the screw shaft, and a ring located at a discharge port far from the opening.
  • a second seal member is provided, and an inner diameter side portion of the second seal member is not in contact with the outer peripheral surface of the screw shaft.
  • the first seal member has an inner diameter side portion inclined inward of the nut in an axial direction and in contact with an outer peripheral surface of the screw shaft,
  • a ring-shaped second seal member is provided at the discharge port far from the opening, and the second seal member has an inner diameter side portion inclined in the axial direction toward the outer side of the nut and on the outer peripheral surface of the screw shaft. It is characterized by being in contact.
  • the first seal member is composed of a plurality of seal members whose inner diameter side portions are in contact with the outer peripheral surface of the screw shaft, and the one farther from the opening.
  • a ring-shaped second seal member is provided at the discharge port of the first seal member, and the second seal member includes a seal member whose inner diameter side portion is in contact with the outer peripheral surface of the screw shaft.
  • the number of seal members constituting the member is smaller than the number of seal members constituting the first seal member.
  • a flange extending radially outward is formed on the nut, and the lubricant supply path is provided on the flange.
  • a flange extending radially outward is formed on the nut, and the first seal member is provided on an inner diameter side of the flange. It is characterized by.
  • FIG. 1 is a partial cross-sectional view of a main part of the ball screw device according to the first embodiment.
  • FIG. 2 is a nut cross-sectional view of the ball screw device according to the second embodiment.
  • FIG. 3 is a nut cross-sectional view of the ball screw device according to the third embodiment.
  • the longitudinal direction in which the screw shaft extends is the axial direction
  • the direction orthogonal to the axial direction is the radial direction.
  • FIG. 1 is a cross-sectional view of a main part of a ball screw device according to a first embodiment of the present invention.
  • the ball screw device 1 includes a screw shaft 4 extending linearly and having a substantially circular cross section, and a substantially cylindrical nut 7 fitted to the outer peripheral surface of the screw shaft 4.
  • a spiral rolling groove 13 for rolling a steel ball 10 as a rolling element is formed on the outer peripheral surface of the screw shaft 4.
  • the cross-sectional shape of the rolling groove 13 is a semicircular arc.
  • a spiral rolling groove 16 having a semicircular cross section is formed on the inner peripheral surface of the nut 7 so as to face the rolling groove 13 of the screw shaft 4.
  • the opposing rolling groove 13 on the screw shaft 4 side and the rolling groove 16 on the nut 7 side form a rolling path for the ball 10.
  • a large number of balls 10 are rotatably mounted in the rolling path, and the nut 7 is fitted to the screw shaft 4 via these balls 10. With this configuration, the ball screw device 1 can move the nut 7 in the axial direction of the screw shaft 4 by rotating the screw shaft 4.
  • the ball 10 rolls on the rolling path by the relative rotation of the screw shaft 4 and the nut 7.
  • the peripheral wall of the nut 7 is provided with a circulating top mounting hole 19 formed so as to penetrate the peripheral wall in the radial direction.
  • the circulation top mounting hole 19 is fitted with a circulation top 25 which is a circulation part having a substantially S-shaped ball circulation path 22 for circulating the ball 10 on the inner peripheral surface.
  • a top-type circulation component in which the circulation path 22 is formed on the inner peripheral surface of the circulation top 25 is used.
  • the circulating component for circulating the ball 10 is not limited to the top type, but an end deflector type, a tube type, or an end cap type may be used.
  • an end deflector type a tube type, or an end cap type may be used.
  • the system concerning these circulation paths is a conventionally well-known thing, detailed description is abbreviate
  • a flange 28 for attaching the nut 7 to the mechanical device is formed on one end of the nut 7 in the axial direction, that is, on the left side of the sheet of FIG.
  • the flange 28 extends radially outward and has a predetermined thickness in the axial direction.
  • the flange 28 is provided with a grease supply path 31 for supplying a new lubricant inside the nut 7, that is, between the screw shaft 4 and the nut 7.
  • the lubricant includes grease or lubricating oil having a high viscosity, and in this embodiment, grease is used as the lubricant.
  • the grease supply path 31 extends from the outer peripheral surface of the flange 28 along the radial direction to the inner peripheral surface of the flange 28, that is, the inner peripheral surface of the nut 7.
  • the space between the nut 7 is open.
  • the greasing route 31 is connected to an automatic greasing device (not shown), and the lubricant is continuously lubricated.
  • the lubricant is supplied to the greasing passage 31 from the supply port 33 on the outer peripheral surface side of the flange 28 and is discharged between the screw shaft 4 and the nut 7 from the lubricant outlet 36 on the inner peripheral surface of the nut 7.
  • the lubricant is discharged between the screw shaft 4 and the nut 7 in the vicinity of the end portion on one axial side of the nut 7.
  • a circular recess 39 concentric with the nut 7 is formed on the inner diameter side edge of one end in the axial direction of the flange 28, and a ring-shaped seal member 42 is attached to the recess 39.
  • the seal member 42 is formed of a synthetic resin or an elastomer, and includes an outer peripheral edge 45 that fits into the recess 39 and an inner peripheral lip 48 disposed inside the rolling groove 13 of the screw shaft 4.
  • the seal member 42 is a contact seal in which the lip portion 48 is in sliding contact with the rolling groove 13 of the screw shaft 4. The adhesion force of the lip portion 48 of the seal member 42 to the screw shaft 4 is large, and leakage of the lubricant interposed between the screw shaft 4 and the nut 7 can be substantially prevented.
  • the lubricant outlet 36 of the grease supply path 31 is located in the vicinity of the seal member 42 on the other side in the axial direction than the seal member 42, that is, on the right side of the drawing in FIG. Further, the seal member 42 prevents foreign matter from entering between the screw shaft 4 and the nut 7.
  • the inner diameter of the other end of the nut 7 in the axial direction that is, the end of the nut 7 opposite to the flange 28 in the axial direction (hereinafter, the end is abbreviated as “end opposite to the flange 28”).
  • a circular recess 51 concentric with the nut 7 is formed on the side edge, and a ring-shaped seal member 54 is attached to the recess 51.
  • the seal member 54 is formed of a synthetic resin or an elastomer, and includes an outer peripheral edge 57 that fits into the recess 51 and an inner peripheral lip 60 disposed inside the rolling groove 13 of the screw shaft 4.
  • the seal member 54 is a contact seal in which the lip portion 60 is in sliding contact with the rolling groove 13 of the screw shaft 4 in the same manner as the seal member 42 on the flange 28 side, but the screw shaft 4 rolls more than the seal member 42.
  • the adhesion to the groove 13 is small. Therefore, leakage to the outside of the lubricant interposed between the screw shaft 4 and the nut 7 is allowed to some extent. Further, the seal member 54 prevents foreign matter from entering between the screw shaft 4 and the nut 7.
  • the seal member 42 on the flange 28 side where the grease supply path 31 and the lubricant outlet 36 are provided is sealed at the end opposite to the flange 28.
  • the adhesion force of the screw shaft 4 to the rolling groove 13 is greater than that of the member 54. That is, the seal member 42 closer to the lubricant outlet 36 from which new lubricant is discharged between the screw shaft 4 and the nut 7 is more threaded than the seal member 54 farther from the lubricant outlet 36.
  • the adhesion to the rolling groove 13 is large.
  • the old lubricant interposed between the screw shaft 4 and the nut 7 is discharged from both ends of the screw hole of the nut 7 to the outside. That is, both ends of the screw hole of the nut 7 are old lubricant outlets.
  • the old lubricant is formed between the lip portion 48 of the seal member 42 on the flange 28 side and the rolling groove 13 of the screw shaft 4, and the lip portion of the seal member 54 on the end opposite to the flange 28. It is discharged to the outside from between 60 and the rolling groove 13 of the screw shaft 4.
  • the sealing member 42 on the flange 28 side has a greater adhesion to the rolling groove 13 of the screw shaft 4 than the sealing member 54 at the end opposite to the flange 28.
  • the seal member 42 closer to the flange 28, that is, closer to the lubricant outlet 36 has a threaded shaft 4 than the end opposite to the flange 28, ie, the seal member 54 farther from the lubricant outlet 36. It is difficult for the lubricant interposed between the nut 7 and the nut 7 to escape to the outside, and the seal member 54 farther from the lubricant outlet 36 brings the lubricant to the outside than the seal member 42 closer to the lubricant outlet 36. Easy to escape. Therefore, the old lubricant is mainly discharged from the end opposite to the flange 28.
  • the ball screw device 1 according to the present embodiment is configured so that the lubricant supplied to the inside of the nut 7, that is, between the screw shaft 4 and the nut 7, is applied to the corner between the screw shaft 4 and the nut 7. It can spread all the way.
  • the lubricant supplied to every corner between the screw shaft 4 and the nut 7 in the ball screw device 1 according to the present embodiment will be described with reference to FIG.
  • the left side toward the paper surface of FIG. 1 is defined as one side in the axial direction
  • the right side is defined as the other side in the axial direction.
  • new lubricant is continuously supplied through an oil supply path 31 by an automatic oil supply device (not shown). That is, new lubricant is constantly supplied to the ball screw device 1.
  • the lubricant already interposed between the screw shaft 4 and the nut 7 is a lubricant that replaces the lubricant that is newly supplied as the old lubricant.
  • the lubricant discharged from the lubricant outlet 36 of the grease supply path 31 between the screw shaft 4 and the nut 7 is lubricated between the screw shaft 4 and the nut 7 in the axial direction on one side and the other side, and further in the circumferential direction. 1 moves to the opposite side of the agent outlet 36, that is, the lower side of the sheet of FIG. 1, and pushes the old lubricant to one side and the other side in the axial direction, and further to the opposite side to the lubricant outlet 36 in the circumferential direction. It is supplied between the ball 10 and both rolling grooves 13 and 16 while being moved.
  • the new lubricant that has moved to one side in the axial direction immediately reaches the seal member 42.
  • a small amount of the old lubricant that has been present on one axial side of the lubricant outlet 36 is pushed and moved by the new lubricant to the opposite side of the lubricant outlet 36 in one axial direction and the circumferential direction.
  • Part of the old lubricant that has moved to one side in the axial direction is discharged to the outside from between the seal member 42 and the rolling groove 13 of the screw shaft 4, and the rest is lubricated with the lubricant outlet 36 in the circumferential direction by the seal member 42.
  • the old lubricant that has moved to the side opposite to the lubricant outlet 36 in the circumferential direction will then move to the other side in the axial direction.
  • the seal member 42 on the flange 28 side that is, the seal member 42 closer to the lubricant outlet 36 has a large adhesion force to the screw shaft 4, so that a part of the new lubricant that has reached the seal member 42 and the screw shaft 4.
  • most of the movement to the one side in the axial direction is restricted by the seal member 42. Since new lubricant is continuously supplied, new lubricant supplied after this state moves to the other side in the axial direction. Thus, the new lubricant that moves to the other side in the axial direction causes the old lubricant to be pushed and moved to the end opposite to the flange 28.
  • the lip portion 60 of the seal member 54 is axially opposite to the other side by the old lubricant. It is elastically deformed by being pushed to. As a result, the old lubricant is discharged from between the lip portion 60 and the rolling groove 13 of the screw shaft 4 to the outside. Thus, the old lubricant is sequentially discharged from the other axial end of the screw hole of the nut 7, the lubricant between the screw shaft 4 and the nut 7 is replaced with a new lubricant, and the new lubricant is replaced with the screw shaft 4 and the nut. It goes all the way to the 7th.
  • the lubricant discharged from the lubricant outlet 36 of the grease supply path 31 between the screw shaft 4 and the nut 7 is lubricated between the screw shaft 4 and the nut 7 in the axial direction on one side and the other side, and further in the circumferential direction. 1 moves to the opposite side of the agent outlet 36, that is, the lower side of the sheet of FIG. 1, and pushes the old lubricant to one side and the other side in the axial direction, and further to the opposite side to the lubricant outlet 36 in the circumferential direction.
  • the new lubricant directed to one side in the axial direction immediately reaches the seal member 42, and a part of the rolling of the seal member 42 and the screw shaft 4 is caused as in the case where the nut 7 is stopped. Although it leaks to the outside from between the groove 13, most of the movement to one side in the axial direction is restricted by the seal member 42. Since new lubricant is continuously supplied, new lubricant supplied after this state moves to the other side in the axial direction.
  • the old lubricant which was initially positioned on one axial side of the lubricant outlet 36 and then positioned on the other axial side of the lubricant outlet 36, and the other axial direction of the lubricant outlet 36 from the beginning.
  • the old lubricant that was present on the side is moved by being pushed to the other side in the axial direction by the new lubricant that is constantly supplied and moved to the other side in the axial direction, and the nut 7 is moved to the one side in the axial direction. Accordingly, the seal member 54 at the end opposite to the flange 28 is sequentially reached.
  • the lip portion 60 of the seal member 54 is elastically deformed by being pushed to the other side in the axial direction by the old lubricant.
  • the old lubricant is discharged from between the lip portion 60 and the rolling groove 13 of the screw shaft 4 to the outside.
  • the old lubricant is sequentially discharged from the other axial end of the screw hole of the nut 7, the lubricant between the screw shaft 4 and the nut 7 is replaced with a new lubricant, and the new lubricant is exchanged with the screw shaft 4. Go all the way to the nut 7.
  • the supplied new lubricant reaches the sealing member 42 on the flange 28 side sequentially as the nut 7 moves to the other side in the axial direction. Since the seal member 42 closer to the lubricant outlet 36 has a high adhesion force to the screw shaft 4, a part of the seal member 42 leaks to the outside from between the seal member 42 and the rolling groove 13 of the screw shaft 4. Is pushed to the other side in the axial direction by the seal member 42 and moves to the other side in the axial direction of the nut 7.
  • the new lubricant that is pushed by the seal member 42 that moves to the other side in the axial direction and moves to the other side in the axial direction causes the old lubricant to be pushed and moved to the end opposite to the flange 28,
  • the seal member 54 at the end opposite to the flange 28 is sequentially reached. Since the seal member 54 far from the lubricant outlet 36 has a small adhesion force to the screw shaft 4, the lip portion 60 of the seal member 54 is elastically deformed by being pushed to the other side in the axial direction by the old lubricant. As a result, the old lubricant is discharged from between the lip portion 60 and the rolling groove 13 of the screw shaft 4 to the outside.
  • the old lubricant is sequentially discharged from the other axial end of the screw hole of the nut 7, the lubricant between the screw shaft 4 and the nut 7 is replaced with a new lubricant, and the new lubricant is exchanged with the screw shaft 4. Go all the way to the nut 7.
  • the screw shaft can be used regardless of whether the nut 7 moves in one of the axial direction or the other direction.
  • the new lubricant supplied between the nut 4 and the nut 7 can be spread to every corner between the screw shaft 4 and the nut 7.
  • the new lubricant can be reliably distributed to every corner between the screw shaft 4 and the nut 7.
  • the ball screw device 1 is not lubricated with a deteriorated lubricant or a lubricant with accumulated wear powder, resulting in poor lubrication or premature wear of the ball screw device 1. Can be prevented.
  • the operability and durability of the ball screw device 1 can be improved. Furthermore, since a complicated configuration for supplying new lubricant and a complicated configuration for discharging old lubricant are not required, an increase in cost can be suppressed.
  • the end opposite to the flange 28, that is, the seal member 54 far from the lubricant outlet 36 uses a contact seal in which the lip portion 60 is in sliding contact with the rolling groove 13 of the screw shaft 4.
  • the contact seal may not be necessary as long as the adhesion to the screw shaft 4 is smaller than that of the seal member 42 closer to the flange 28, that is, the lubricant outlet 36.
  • the seal member 54 far from the lubricant outlet 36 can more easily release the lubricant interposed between the screw shaft 4 and the nut 7 to the outside than the seal member 42 closer to the lubricant outlet 36.
  • it may not be a contact seal. That is, a non-contact seal in which a slight gap is interposed between the lip portion 60 and the rolling groove 13 of the screw shaft 4 may be used. In this case, the lubricant older than the contact seal can be efficiently discharged to the outside.
  • a configuration in which a seal member is not provided at the end of the nut 7 on the side opposite to the flange 28 may be adopted.
  • the new lubricant can be spread to every corner between the screw shaft 4 and the nut 7. In this case, since dust or the like easily enters between the screw shaft 4 and the nut 7 from the outside, it is desirable to use it in a clean environment with little dust in the air.
  • the end of the nut 7 farther from the lubricant outlet 36 is interposed between the screw shaft 4 and the nut 7 than the end of the nut 7 closer to the lubricant outlet 36.
  • a contact seal may be provided at the end of the nut 7 far from the lubricant outlet 36, a non-contact seal may be provided, or a seal member Need not be provided.
  • FIG. 2 is a cross-sectional view of the nut of the ball screw device according to the second embodiment.
  • the second embodiment is different from the first embodiment in the configuration of the seal members at both ends of the nut.
  • Other configurations are the same as those of the first embodiment.
  • the illustration of the rolling groove 16 on the inner peripheral surface of the nut 107 is omitted.
  • the sealing member 142 on the flange 28 side and the sealing member 154 on the end opposite to the flange 28 have the same adhesion to the screw shaft 4 (not shown in FIG. 2).
  • the seal member 142 closer to the flange 28, that is, closer to the lubricant outlet 36 has an inward seal in which the tip of the lip portion 148 is inclined inward of the nut 107 in the axial direction. It is.
  • the inward seal retains the lubricant interposed between the screw shaft 4 and the nut 107, that is, has an effect of being difficult to discharge to the outside. In other words, the inward seal is unlikely to let the lubricant escape to the outside.
  • the end opposite to the flange 28, that is, the seal member 154 far from the lubricant outlet 36 is an outward seal in which the tip of the lip 160 is inclined in the axial direction to the outside of the nut.
  • the outward seal has an effect of preventing foreign matter from entering the screw shaft 4 and the nut 107 from the outside, but has a small effect of holding the lubricant interposed between the screw shaft 4 and the nut 107. It is easy to let the lubricant escape to the outside.
  • FIG. 3 is a cross-sectional view of the nut of the ball screw device according to the third embodiment.
  • 3rd Embodiment differs from 1st Embodiment in the structure of the sealing member of the both ends of a nut.
  • Other configurations are the same as those of the first embodiment.
  • the illustration of the rolling groove 16 on the inner peripheral surface of the nut 207 is omitted.
  • the sealing member 242 on the flange 28 side and the sealing member 254 on the end opposite to the flange 28 have the same adhesion to the screw shaft 4 (not shown in FIG. 3).
  • an outward seal 242 in which the tip of the lip portion 248 is inclined in the axial direction to the outside of the nut 207 Two are arranged side by side in the axial direction.
  • the end opposite to the flange 28, that is, the seal member 254 far from the lubricant outlet 36, has an outward direction in which the tip of the lip 260 is inclined in the axial direction to the outside of the nut 207, as in the flange 28 side.
  • the number is one.
  • the outward seal has an effect of preventing foreign matter from entering between the screw shaft 4 and the nut 207, but between the screw shaft 4 and the nut 207. The action of retaining the intervening lubricant is small, and the lubricant is easily released to the outside.
  • new lubricant supplied between the screw shaft 4 and the nut 207 is applied to each corner between the screw shaft 4 and the nut 207. Can be spread to. Further, according to the present embodiment, even when the axial length of the nut 207 is long, new lubricant can be reliably distributed to every corner between the screw shaft 4 and the nut 207. As a result, the ball screw device according to the third embodiment is not lubricated with a deteriorated lubricant or a lubricant with accumulated wear powder, resulting in poor lubrication or accelerated wear of the ball screw device. Can be prevented. Thus, according to this embodiment, the operability and durability of the ball screw device can be enhanced. Further, since a complicated configuration for supplying new lubricant and a complicated configuration for discharging old lubricant are not required, an increase in cost can be suppressed.
  • the present invention is not limited to the above-described embodiments and can be modified as appropriate.
  • the number of nuts 7 loosely fitted to the screw shaft 4 is one, but a double nut type in which two nuts are connected in the axial direction and preload is applied may be used.
  • the flange 28 is formed at one end of the nut 7 in the axial direction.
  • the lubricant outlet 36 may be formed at a position that is biased toward one side or the other side in the axial direction from the central portion of the nut 7 in the axial direction.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transmission Devices (AREA)
  • Sealing With Elastic Sealing Lips (AREA)

Abstract

La présente invention concerne un dispositif (1) de vis à billes qui comporte, en vue de fournir un lubrifiant entre une tige de vis (4) et un écrou (7), un passage d'alimentation (31) en lubrifiant qui présente une sortie (36) de lubrifiant dans la surface périphérique interne de l'écrou (7) et qui est ménagé dans une embase (28). Les extrémités opposées du trou fileté de l'écrou (7) servent respectivement en tant qu'ouvertures de déversement du lubrifiant fourni entre la tige de vis (4) et l'écrou (7). Un élément d'étanchéité (42) agencé au niveau de l'extrémité de l'écrou (7), qui se trouve à proximité de la sortie (36) de lubrifiant, présente sur la surface périphérique externe de la tige de vis (4) une force d'adhérence supérieure à celle d'un élément d'étanchéité (54) agencé au niveau de l'extrémité de l'écrou (7), qui se trouve à l'opposé de la sortie (36) de lubrifiant, et, par conséquent, le lubrifiant est peu susceptible de faire l'objet d'une fuite.
PCT/JP2015/073409 2014-09-03 2015-08-20 Dispositif de vis à billes WO2016035563A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2014-179145 2014-09-03
JP2014179145A JP6446923B2 (ja) 2014-09-03 2014-09-03 ボールねじ装置

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WO2016035563A1 true WO2016035563A1 (fr) 2016-03-10

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PCT/JP2015/073409 WO2016035563A1 (fr) 2014-09-03 2015-08-20 Dispositif de vis à billes

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JP (1) JP6446923B2 (fr)
TW (1) TW201621190A (fr)
WO (1) WO2016035563A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59164861U (ja) * 1983-04-20 1984-11-05 トキコ株式会社 ボ−ルねじ
JPH0488756U (fr) * 1990-08-27 1992-07-31
JPH11118017A (ja) * 1997-10-15 1999-04-30 Nippon Seiko Kk 潤滑剤の補給方法
JP2008133944A (ja) * 2006-10-31 2008-06-12 Nsk Ltd ボールねじ用接触シール
JP2011133049A (ja) * 2009-12-25 2011-07-07 Nsk Ltd ボールねじ装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59164861U (ja) * 1983-04-20 1984-11-05 トキコ株式会社 ボ−ルねじ
JPH0488756U (fr) * 1990-08-27 1992-07-31
JPH11118017A (ja) * 1997-10-15 1999-04-30 Nippon Seiko Kk 潤滑剤の補給方法
JP2008133944A (ja) * 2006-10-31 2008-06-12 Nsk Ltd ボールねじ用接触シール
JP2011133049A (ja) * 2009-12-25 2011-07-07 Nsk Ltd ボールねじ装置

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