WO2017043277A1 - Dispositif d'entraînement du type vis et billes et unité flottante à corps mobile - Google Patents

Dispositif d'entraînement du type vis et billes et unité flottante à corps mobile Download PDF

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Publication number
WO2017043277A1
WO2017043277A1 PCT/JP2016/074010 JP2016074010W WO2017043277A1 WO 2017043277 A1 WO2017043277 A1 WO 2017043277A1 JP 2016074010 W JP2016074010 W JP 2016074010W WO 2017043277 A1 WO2017043277 A1 WO 2017043277A1
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WO
WIPO (PCT)
Prior art keywords
rolling element
rolling
element arrangement
arrangement groove
groove
Prior art date
Application number
PCT/JP2016/074010
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English (en)
Japanese (ja)
Inventor
弘幸 岸
勉 富樫
旭 石原
Original Assignee
Thk株式会社
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Application filed by Thk株式会社 filed Critical Thk株式会社
Publication of WO2017043277A1 publication Critical patent/WO2017043277A1/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

Definitions

  • the present invention relates to a ball screw type driving device and a movable body floating unit.
  • Patent Document 1 discloses a ball screw type driving device.
  • This ball screw type driving device includes a nut member on a movable body supported movably by a guide portion. By reciprocating rotation of the screw shaft screwed to the nut member, the movable body is driven to reciprocate along the guide portion via the nut member.
  • the ball screw type driving device includes a mounting bolt fixed to the movable body in a substantially equal circumferential direction and loosely fitted in a mounting hole of the nut member, and a first thrust interposed between the movable body and the nut member.
  • the second thrust bearing interposed between the bearing and the nut member and the mounting bolt supports the nut member movably in the radial direction with respect to the movable body, and absorbs vibration during rotation of the screw shaft.
  • the ball screw type driving device having the above configuration has a thrust bearing between the nut member and the movable body. For this reason, the mounting bolt fixed to the movable body is inserted into the mounting hole of the nut member, and the rotation of the nut member is regulated by the mounting bolt (see paragraph 0023 of Patent Document 1). However, when the rotation of the thrust bearing is restricted by the mounting bolt, the mounting bolt and the nut member are constrained, so that the vibration during rotation of the screw shaft is directly transmitted to the movable body via the nut member and the mounting bolt. Thus, in the above configuration, the floating function of the thrust bearing does not make sense, and there is a possibility that vibration during rotation of the screw shaft cannot be absorbed.
  • the present invention provides a ball screw type driving device and a movable body floating unit capable of restricting the rotation of a nut member and absorbing a vibration during rotation of a screw shaft transmitted to the movable body.
  • a ball screw type driving device includes a screw shaft having a spiral rolling element rolling groove on an outer peripheral surface, and a spiral shape facing the rolling element rolling groove on an inner peripheral surface.
  • a nut member having a rolling element load rolling groove, a plurality of first rolling elements interposed between the rolling element rolling groove and the rolling element load rolling groove, and a movable movable together with the nut member A body, a guide portion that supports the movable body so as to be movable in an axial direction in which the screw shaft extends, and a connection that couples the nut member and the movable body via a plurality of second rolling elements in the axial direction.
  • a vessel A vessel.
  • the coupler includes a rolling element arrangement groove that arranges the plurality of second rolling elements in a circumferential direction of the screw shaft.
  • the rolling element arrangement groove is formed in a non-circular shape when viewed from the axial direction or a circular shape whose center does not coincide with the axis of the screw shaft as viewed from the axial direction.
  • the nut member may be integrally provided with a plate-like flange portion.
  • the rolling element arrangement groove includes a first rolling element arrangement groove disposed on one surface side in the axial direction of the flange portion and a second surface disposed on the other surface side in the axial direction of the flange portion. And rolling element arrangement grooves.
  • the coupler has a pair of plate members that sandwich the flange portion via the plurality of second rolling elements arranged in the first rolling element arrangement groove and the second rolling element arrangement groove, At least one of the pair of plate members may have an attachment portion that is detachably attached to the movable body.
  • the coupler may have an attachment plate that is detachably attached to the movable body.
  • the rolling element arrangement groove includes a first rolling element arrangement groove disposed on one surface of the mounting plate in the axial direction and a second rolling element disposed on the other surface of the mounting plate in the axial direction. And a moving body arranging groove.
  • the coupler has a pair of plate members that sandwich the mounting plate via the plurality of second rolling elements arranged in the first rolling element arrangement groove and the second rolling element arrangement groove, At least one of the pair of plate members may have an attachment portion that is detachably attached to the nut member.
  • each of the first rolling element arrangement groove and the second rolling element arrangement groove has a predetermined contact angle with respect to the radial direction of the screw shaft. You may contact a rolling element.
  • the contact angle of the first rolling element arrangement groove and the second rolling element arrangement groove may be set to a front combination angular type.
  • the contact angle ⁇ of the first rolling element arrangement groove and the second rolling element arrangement groove is: 45 ° ⁇ ⁇ 90 ° May be satisfied.
  • the movable body floating unit provided in the ball screw type driving device includes a screw shaft having a spiral rolling element rolling groove on the outer peripheral surface, and the rolling element rolling unit on the inner peripheral surface.
  • a coupler coupled via a moving body.
  • the coupler includes a rolling element arrangement groove that arranges the plurality of second rolling elements in a circumferential direction of the screw shaft.
  • the rolling element arrangement groove is formed in a non-circular shape when viewed from the axial direction or a circular shape whose center does not coincide with the axis of the screw shaft as viewed from the axial direction.
  • the rotation of the nut member can be restricted and the vibration during rotation of the screw shaft transmitted to the movable body can be absorbed.
  • FIG. 2 is a cross-sectional view taken along the line AA in FIG. 1 of the present invention. It is a perspective view of a nut member provided with a connector in a 1st embodiment of the present invention. It is a perspective view of nut member 3 which removed a pair of board members in a 1st embodiment of the present invention. It is the figure which looked at the rolling element arrangement
  • FIG. 1 is a plan view of a ball screw type driving device 1 according to a first embodiment of the present invention.
  • 2 is a cross-sectional view taken along line AA in FIG.
  • the ball screw type driving device 1 includes a screw shaft 2, a nut member 3, a ball 4 (first rolling element), a movable body 5, a guide portion 6, and a connection. And a container 7.
  • the screw shaft 2 has a spiral ball rolling groove 21 (rolling element rolling groove) on the outer peripheral surface 2a as shown in FIG. As shown in FIG. 1, both ends of the screw shaft 2 are rotatably supported via a bearing 9 with respect to the base portion 8 of the ball screw type driving device 1. One end of the screw shaft 2 is connected to the motor 10. The motor 10 is supported by a support member 12 fixed to the base portion 8. The motor 10 rotates the screw shaft 2 around its axis C.
  • the nut member 3 has a spiral ball load rolling groove 31 (rolling element load rolling groove) on the inner peripheral surface 3b.
  • the ball load rolling groove 31 faces the ball rolling groove 21.
  • the ball load rolling path 13 is formed in the facing portion.
  • the ball 4 is interposed between the ball rolling groove 21 and the ball load rolling groove 31.
  • the ball 4 rolls under a load on the ball load rolling path 13.
  • the nut member 3 has rolling element circulation parts (not shown) such as a return pipe.
  • the rolling element circulation component has a rolling element circulation path and connects one end and the other end of the ball load rolling path 13. When one end and the other end of the ball load rolling path 13 are connected, an infinite circulation path of the ball 4 is formed. That is, the ball 4 rolls to the other end (tail) of the ball load rolling path 13, then moves in the rolling element circulation component, and is introduced again to one end (lead) of the ball load rolling path 13.
  • the movable body 5 is a movable table having a rectangular shape in a plan view in which a bracket 5a is disposed at the center thereof.
  • the bracket 5a is provided with a plurality of screw holes 5a1, and is fixed to the table portion of the movable body 5 by bolts (not shown).
  • the coupler 7 mentioned later is connected to the bracket 5a.
  • the movable body 5 moves together with the nut member 3 via the coupler 7.
  • the guide unit 6 supports the movable body 5 so as to be movable in an axial direction in which the screw shaft 2 extends (hereinafter, referred to as an axial direction).
  • the guide unit 6 includes a linear guide 61 and a rail 62.
  • the linear guide 61 is provided with a plurality of screw holes 61a.
  • the linear guide 61 is arrange
  • the rails 62 are arranged on both sides of the screw shaft 2 in a plan view and extend in parallel with the screw shaft 2.
  • the linear guide 61 engages with the rail 62 via a ball (rolling body) (not shown), and guides the movable body 5 along the rail 62.
  • the coupler 7 connects the nut member 3 and the movable body 5 in the axial direction via a plurality of balls 71 (second ball rolling elements).
  • the coupler 7 has rolling element arrangement grooves 72 that arrange the balls 71 in the circumferential direction of the screw shaft 2.
  • the nut member 3 is integrally provided with a plate-like flange portion 32.
  • the coupler 7 has a pair of plate members 73 a and 73 b that sandwich the flange portion 32 via the balls 71.
  • the rolling element arrangement groove 72 of the present embodiment is formed by a concave rolling element arrangement surface 33 provided in the flange portion 32 and a concave rolling element arrangement surface 74 provided in the pair of plate members 73a and 73b. .
  • At least one of the pair of plate members 73a and 73b (both in the present embodiment) has an attachment hole 75 (attachment portion) that is detachably attached to the movable body 5.
  • the attachment hole 75 penetrates the pair of plate members 73a and 73b in the axial direction.
  • the bracket 5 a of the movable body 5 has a screw hole 5 a 2 at a position facing the mounting hole 75.
  • a bolt 76 is screwed into the screw hole 5a2.
  • the bolt 76 is disposed so as to pass through the attachment hole 75 and tightens the pair of plate members 73a and 73b in the axial direction.
  • the pair of plate members 73 a and 73 b are detachably attached to the movable body 5.
  • FIG. 3 is a perspective view of the nut member 3 including the coupler 7 according to the first embodiment of the present invention.
  • FIG. 4 is a perspective view of the nut member 3 with the pair of plate members 73a and 73b removed in the first embodiment of the present invention.
  • FIG. 5 is a view of the rolling element arrangement groove 72 in the first embodiment of the present invention viewed from the axial direction.
  • FIG. 6 is an enlarged cross-sectional view of a main part of the coupler 7 in the first embodiment of the present invention.
  • the pair of plate members 73a and 73b are formed in a disc shape. At the center of the pair of plate members 73a and 73b, an opening 77 through which the screw shaft 2 is inserted is provided. An outer peripheral surface 78A of the pair of plate members 73a and 73b is formed in a circular shape. On the other hand, inner peripheral surfaces 78B (openings 77) of the pair of plate members 73a and 73b are formed in an elliptical shape.
  • the pair of plate members 73a and 73b is provided with a split surface 80 extending in the radial direction (hereinafter referred to as the radial direction) of the screw shaft 2, and each of the plate members 73a and 73b can be divided into two (see FIG. 4). ).
  • the rolling element arrangement groove 72 includes a first rolling element arrangement groove 72 a arranged on one surface side 32 ⁇ / b> A in the axial direction of the flange portion 32 and the other surface in the axial direction of the flange portion 32.
  • channel 72b arrange
  • the one surface side 32 ⁇ / b> A includes one surface 32 a in the axial direction of the flange portion 32 and one corner portion 32 b in the axial direction of the flange portion 32.
  • the other surface side 32 ⁇ / b> B includes the other surface 32 c in the axial direction of the flange portion 32 and the other corner portion 32 d in the axial direction of the flange portion 32.
  • the first rolling element arrangement groove 72a of the present embodiment is arranged at one corner portion 32b in the axial direction of the flange portion 32. Further, the second rolling element arrangement groove 72 b of this embodiment is arranged at the other corner portion 32 d in the axial direction of the flange portion 32. As shown in FIG. 5, the flange portion 32 is formed in an elliptical shape when viewed from the axial direction. For this reason, the rolling element arrangement groove 72 (the first rolling element arrangement groove 72a and the second rolling element arrangement groove 72b) is formed in an elliptical shape when viewed from the axial direction.
  • the rolling element arrangement groove 72 is formed in an elliptical shape whose center coincides with the axis C of the screw shaft 2. Moreover, the rolling element arrangement
  • the rolling element arrangement groove 72 has a line-symmetric shape with respect to the vertical axis, and also has a line-symmetric shape with respect to the horizontal axis.
  • the rolling element arrangement groove 72 of the present embodiment is formed in an elliptical shape having a major axis that is approximately 1.2 to 1.5 times the length of the minor axis.
  • the first rolling element arrangement groove 72 a and the second rolling element arrangement groove 72 b are in contact with the ball 71 with a predetermined contact angle with respect to the radial direction of the screw shaft 2.
  • the contact angle of the first rolling element arrangement groove 72a and the second rolling element arrangement groove 72b is set to an angular type of front combination.
  • the angular contact angle of the front combination refers to the straight line L1 connecting the contact point between the ball 71 and the rolling element arrangement surfaces 33 and 74 in the first rolling element arrangement groove 72a and the ball in the second rolling element arrangement groove 72b.
  • the straight line L2 that connects the contact points of 71 and the rolling element arrangement surfaces 33 and 74 gradually approaches the flange portion 32, and the contact angle with respect to the flange portion 32 gradually decreases.
  • the contact angle of the first rolling element arrangement groove 72a and the second rolling element arrangement groove 72b is ⁇
  • the following relational expression (1) is satisfied. 45 ° ⁇ ⁇ 90 °
  • the angle is larger than 45 °.
  • the contact angle ⁇ of the first rolling element arrangement groove 72a and the second rolling element arrangement groove 72b is set with a predetermined margin from the above critical value.
  • the following relational expression (2) is satisfied. It is preferable. 50 ° ⁇ ⁇ 85 ° (2)
  • the contact angle ⁇ of the first rolling element arrangement groove 72a and the second rolling element arrangement groove 72b is set to 60 °, for example.
  • the screw shaft 2 is rotated by a motor 10.
  • the screw shaft 2 rotates, the nut member 3 engaged with the screw shaft 2 through the ball 4 moves in the axial direction.
  • the bracket 5 a of the movable body 5 is connected to the nut member 3 via the connector 7.
  • the movable body 5 moves in the axial direction together with the nut member 3 while being guided in the axial direction by the guide portion 6.
  • vibration during rotation of the screw shaft 2 occurs. Occurs (schematically indicated by reference numeral F1 in FIG. 6).
  • the coupler 7 couples the nut member 3 and the movable body 5 via a plurality of balls 71 in the axial direction.
  • the nut member 3 and the movable body 5 are rigidly connected in the axial direction, and the fluctuation during rotation of the screw shaft 2 in the radial direction is caused by the contact fluctuation of the ball 71 in the rolling element arrangement groove 72. Can be absorbed.
  • the coupler 7 restrains the movable body 5 in the axial direction to improve the positional accuracy, and keeps the movable body 5 in a floating state in the radial direction, and transmits the vibration during rotation of the screw shaft 2 to the movable body 5. Can not be.
  • the coupler 7 has a rolling element arrangement groove 72 for arranging a plurality of balls 71 in the circumferential direction of the screw shaft 2.
  • the rolling element arrangement groove 72 is formed in a non-circular (elliptical) shape when viewed from the axial direction. According to this configuration, the rotation of the nut member 3 can be restricted only by the restraint by the ball 71. That is, even if the screw shaft 2 rotates, the rolling element arrangement groove 72 is non-circular, so that the ball 71 cannot roll in the circumferential direction of the screw shaft 2, and as a result, the nut member 3 does not rotate. For this reason, only the ball 71 can receive the rotational torque of the nut member 3.
  • the rotation of the nut member 3 can be restricted only by the ball 71 without providing a rotation-preventing bolt as in the prior art, and the screw shaft 2 transmitted to the movable body 5 without impairing the floating function due to the contact fluctuation of the ball 71.
  • the vibration during rotation can be absorbed.
  • the rolling element disposing groove 72 has a line-symmetric shape with respect to a vertical axis extending in the vertical direction orthogonal to the axial direction, and a horizontal axis extending in the horizontal direction orthogonal to the axial direction. It is also a line symmetrical shape. According to this configuration, since the contact stress due to the plurality of balls 71 is balanced in the vertical direction and the horizontal direction, anisotropy (bias) of restraining force by the balls 71 in the vertical direction and the horizontal direction can be suppressed. it can. For this reason, it is possible to suppress the deviation of the shake during rotation of the screw shaft 2.
  • the rolling element arrangement groove 72 is elliptical when viewed from the axial direction.
  • the plurality of balls 71 can receive the rotational torque of the nut member 3 as a whole.
  • the burden of rotational torque on the ball 71 disposed at the corner of the polygon is increased.
  • the rotational torque can be applied to the entire 71 approximately evenly. For this reason, the component lifetime of the plurality of balls 71 is extended, and the maintenance frequency, replacement frequency, and the like can be reduced.
  • the coupler 7 is the flange part 32 via the some ball
  • the pair of plate members 73 a and 73 b have attachment holes 75 that are detachably attached to the movable body 5. According to this configuration, it is possible to connect to the movable body 5 while sandwiching the flange portion 32 between the plurality of balls 71 disposed in the first rolling element arrangement groove 72a and the second rolling element arrangement groove 72b. That is, the structure in which only the ball 71 is in contact with the flange portion 32 (nut member 3) can be realized by the pair of plate members 73a and 73b. The vibration during rotation can be absorbed.
  • each of the first rolling element arrangement groove 72 a and the second rolling element arrangement groove 72 b comes into contact with the ball 71 with a predetermined contact angle with respect to the radial direction of the screw shaft 2. Yes.
  • the contact angle of the first rolling element arrangement groove 72a and the second rolling element arrangement groove 72b is set to an angular type of front combination.
  • the pitching of the nut member 3 (schematically indicated by the symbol F2 in FIG. 6) can also be absorbed. That is, the angular combination of the front combination has a small distance between the operating points with respect to the flange portion 32, and therefore can allow the ball 71 to change the angle of the nut member 3 in the pitch direction due to contact variation. For this reason, it is possible to prevent vibration due to pitching of the nut member 3 from being transmitted to the movable body 5.
  • the contact angle ⁇ of the first rolling element arrangement groove 72a and the second rolling element arrangement groove 72b satisfies the relationship of 45 ° ⁇ ⁇ 90 °. That is, when the contact angle ⁇ is larger than 45 °, the rigidity in the axial direction of the coupler 7 becomes higher than the rigidity in the radial direction, and the nut member 3 and the movable body 5 can be rigidly connected in the axial direction. The moving accuracy of the movable body 5 in the direction can be increased. Further, when the contact angle ⁇ is smaller than 90 °, the coupler 7 can be an angular type as described above, and not only the radial runout (indicated by reference numeral F1) during rotation of the screw shaft 2 but also a nut. The vibration (indicated by reference numeral F2) due to pitching of the member 3 can also be absorbed.
  • the ball screw type driving device 1 includes the screw shaft 2 having the spiral ball rolling groove 21 on the outer peripheral surface 2a and the ball rolling groove 21 on the inner peripheral surface 3b. And a nut member 3 having a spiral ball load rolling groove 31 facing each other, a plurality of balls 4 interposed between the ball rolling groove 21 and the ball load rolling groove 31, and movable together with the nut member 3 It has a movable body 5 and a guide portion 6 that supports the movable body 5 so as to be movable in the axial direction in which the screw shaft 2 extends.
  • the ball screw type driving device 1 includes a coupler 7 that connects the nut member 3 and the movable body 5 via a plurality of balls 71 in the axial direction.
  • the coupler 7 has rolling element arrangement grooves 72 that arrange a plurality of balls 71 in the circumferential direction of the screw shaft 2.
  • the rolling element arrangement groove 72 is formed in a non-circular (elliptical) shape when viewed from the axial direction. With this configuration, it is possible to regulate the rotation of the nut member 3 and absorb the vibration during rotation of the screw shaft transmitted to the movable body 5.
  • FIG. 7 is a cross-sectional view of a ball screw type driving apparatus 1A according to the second embodiment of the present invention.
  • FIG. 8 is a view of the rolling element arrangement groove 72A in the second embodiment of the present invention viewed from the axial direction.
  • the ball screw type driving device 1A of the second embodiment is different from the above embodiment in that it has a movable body floating unit 100 that is detachably attached.
  • the movable body floating unit 100 has a coupler 7 that connects the nut member 3 and the movable body 5 via a plurality of balls 71 in the axial direction.
  • the coupler 7 of the second embodiment includes a mounting plate 101 that is detachably attached to the movable body 5 and a pair of plate members 102 a and 102 b that sandwich the mounting plate 101 via a plurality of balls 71.
  • the rolling element arrangement groove 72A for arranging a plurality of balls 71 is formed by a concave rolling element arrangement surface 103 provided on the mounting plate 101 and a concave rolling element arrangement surface 104 provided on the pair of plate members 102a and 102b. It is formed.
  • the mounting plate 101 has a mounting hole 105 penetrating in the axial direction.
  • a counterbore 105 a is formed in the mounting hole 105.
  • a bolt 76 that is screwed into the screw hole 5 a 2 of the bracket 5 a of the movable body 5 is inserted into the mounting hole 105.
  • the attachment plate 101 is detachably attached to the movable body 5 by bolts 76.
  • the mounting plate 101 has a through hole 106 that penetrates in the axial direction. Bolts 107 that connect the pair of plate members 102 a and 102 b are inserted through the through holes 106.
  • the plate member 102 a has a through hole 108 that penetrates in the axial direction at a position facing the through hole 106.
  • a counterbore 108 a is formed in the through hole 108.
  • the plate member 102 b has a screw hole 109 at a position facing the through hole 106.
  • a bolt 107 is screwed into the screw hole 109.
  • the bolt 107 is disposed so as to pass through the through holes 106 and 108, and tightens the pair of plate members 102a and 102b in the axial direction. Thereby, a pair of board member 102a, 102b is connected.
  • the through hole 106 is formed larger than the diameter of the bolt 107 and is configured so that the bolt 107 does not contact the mounting plate 101.
  • At least one of the pair of plate members 102a and 102b (in this embodiment, the plate member 102a) has a screw hole 109 (attachment portion) that is detachably attached to the nut member 3.
  • a bolt 110 is screwed into the screw hole 109.
  • the flange part 32 of the nut member 3 is provided with an insertion hole 111 through which the bolt 110 is inserted.
  • a counterbore 111 a is formed in the insertion hole 111.
  • the bolt 110 tightens the plate member 102a and the flange portion 32 in the axial direction. Accordingly, the plate member 102a is detachably attached to the nut member 3.
  • the rolling element arrangement groove 72A is a first rolling element arrangement groove 72a arranged on one surface 101a in the axial direction of the mounting plate 101 and a second rolling element arrangement groove 72a arranged on the other surface 101b in the axial direction of the mounting plate 101.
  • Rolling element arrangement groove 72b The 1st rolling element arrangement
  • channel 72b become a structure which arrange
  • the rolling element arrangement grooves 72A (the first rolling element arrangement grooves 72a and the second rolling element arrangement grooves 72b) are formed in a polygonal shape as viewed from the axial direction, as shown in FIG.
  • the rolling element arrangement groove 72A is formed in a quadrangle whose center of gravity coincides with the axis C of the screw shaft 2. Further, the rolling element arrangement groove 72A is formed in a rectangular shape in which a short side is set along a vertical axis extending in the vertical direction and a long side is set along a horizontal axis extending in the horizontal direction. The rolling element arrangement groove 72A is formed in a rectangular shape having a long side of about 1.2 to 1.5 times the length of the short side. A predetermined curvature is given to the corner portion 72A1 that is an intersection of the short side and the long side of the rectangle, and the corner portion 72A1 is curved.
  • the coupler 7 couples the nut member 3 and the movable body 5 via the plurality of balls 71 in the axial direction as shown in FIG.
  • the nut member 3 and the movable body 5 are rigidly connected in the axial direction, and the fluctuation during rotation of the screw shaft 2 in the radial direction is caused by the contact fluctuation of the ball 71 in the rolling element arrangement groove 72. Can be absorbed. Further, as shown in FIG.
  • the coupler 7 includes a mounting plate 101 detachably attached to the movable body 5, a first rolling element arrangement groove 72 a, and a second rolling element arrangement groove. And a pair of plate members 102 a and 102 b that sandwich the attachment plate 101 via a plurality of balls 71 arranged in 72 b, and the plate member 102 a has a screw hole 109 that is detachably attached to the nut member 3.
  • the nut member 3 and the movable body 5 are detachable while the mounting plate 101 is sandwiched between the plurality of balls 71 arranged in the first rolling element arrangement groove 72a and the second rolling element arrangement groove 72b. Can be linked to. For this reason, the movable body floating unit 100 can be easily installed with respect to the existing ball screw type driving device.
  • the rolling element arrangement groove 72A of the second embodiment is arranged on one surface 101a and the other surface 101b in the axial direction of the mounting plate 101. According to this configuration, it is easy to process the rolling element arrangement groove 72A. That is, when the rolling element disposition groove 72 is disposed in the corners 32b and 32d (see FIG. 6) of the flange portion 32 as in the above-described embodiment, it is necessary to form the groove with a cam grinding machine or the like.
  • the rolling element arrangement groove 72A is formed on the plate surface of the mounting plate 101 as in the embodiment, it can be formed by a general processing machine such as a ball end mill. The groove can be easily formed.
  • the movable body floating unit 100 provided in the ball screw type driving device 1A includes the screw shaft 2 having the spiral ball rolling groove 21 on the outer peripheral surface 2a, the inner shaft A nut member 3 having a spiral ball load rolling groove 31 opposed to the ball rolling groove 21 on the peripheral surface 3b, and a plurality of balls 4 interposed between the ball rolling groove 21 and the ball load rolling groove 31. And a movable body 5 movable together with the nut member 3 and a guide portion 6 that supports the movable body 5 so as to be movable in the axial direction in which the screw shaft 2 extends.
  • the movable body floating unit 100 includes a coupler 7 that couples the nut member 3 and the movable body 5 via a plurality of balls 71 in the axial direction.
  • the coupler 7 has a rolling element arrangement groove 72 ⁇ / b> A for arranging a plurality of balls 71 in the circumferential direction of the screw shaft 2.
  • the rolling element arrangement groove 72A is formed in a non-circular (rectangular) shape when viewed from the axial direction. With this configuration, it is possible to regulate the rotation of the nut member 3 and absorb the vibration during rotation of the screw shaft transmitted to the movable body 5.
  • FIG. 9 is a view of the rolling element arrangement groove 72B in another embodiment of the present invention viewed from the axial direction.
  • the rolling element arrangement groove 72B shown in FIG. 9 has a first rolling element arrangement groove 72a and a second rolling element arrangement groove 72a having a periodicity in which the same shape (wave shape) is repeated a predetermined number of times in the circumferential direction of the screw shaft 2.
  • 72b The period of the first rolling element arrangement groove 72a and the period of the second rolling element arrangement groove 72b are shifted from each other by a half period. According to this configuration, the period of the first rolling element arrangement groove 72a and the period of the second rolling element arrangement groove 72b are equal to each other than the structure of the above-described embodiment (see FIGS. 5 and 8). Anisotropy (bias) due to the restraining force of the ball 71 can be greatly reduced.
  • FIG. 10 is a view of the rolling element arrangement groove 72C in another embodiment of the present invention viewed from the axial direction.
  • the rolling element arrangement groove 72 ⁇ / b> C shown in FIG. 10 is formed in a circular shape when viewed from the axial direction, the circular center C ⁇ b> 1 does not coincide with the axial center C of the screw shaft 2.
  • the center C1 of the rolling element arrangement groove 72C is offset from the axis C of the screw shaft 2, the ball 71 cannot roll in the circumferential direction of the screw shaft 2 even if it is circular. Therefore, similarly to the above embodiment, the rotation of the nut member 3 can be restricted only by the restraint by the ball 71.
  • the rolling element arrangement grooves are arranged in one row, but the rolling element arrangement grooves are arranged in a plurality of rows, and the diameter of the second rolling element is made smaller (preferably than the first rolling element). (Small).
  • the contact stress of Hertz increases, and the rotation of the nut member 3 can be suitably controlled.
  • the ball is exemplified as the second rolling element, but the second rolling element only needs to be able to change the contact point.
  • a spherical roller having a thick center and narrow both ends is adopted. can do.
  • the rolling element arrangement groove is arranged in an angular shape, but may be arranged in a thrust type as in the second embodiment.
  • rolling element arrangement grooves are arranged on one surface and the other surface in the axial direction of the flange portion.
  • the shape of the rolling element arrangement groove of the first embodiment may be a polygon (square or other polygon) as shown in FIG. 8, or may be an irregular shape as shown in FIG. As shown in FIG. 10, it may be circular and the center may be offset.
  • the rolling element arrangement groove is arranged in a thrust type, but may be arranged in an angular type as in the second embodiment.
  • the contact angle can be changed in the second embodiment as in the first embodiment by changing the shape and arrangement of the grooves as disclosed in Japanese Patent Application Laid-Open No. 2006-600767.
  • the shape of the rolling element arrangement groove of the second embodiment may be an ellipse as shown in FIG. 5, a polygon other than the quadrangle shown in FIG. 8, or as shown in FIG.
  • the shape may be irregular, or may be circular and offset at the center as shown in FIG.
  • the rotation of the nut member can be restricted and the vibration during rotation of the screw shaft transmitted to the movable body can be absorbed.
  • Ball screw type drive device Screw shaft 2a Outer peripheral surface 3 Nut member 3b Inner peripheral surface 4 Ball (first rolling element) 5 Movable body 6 Guide part 7 Coupler 21 Ball rolling groove (Rolling body rolling groove) 31 Ball-loaded rolling groove (rolling element loaded rolling groove) 32 Flange portion 32A One side 32B The other side 71 Ball (second rolling element) 72, 72A, 72B, 72C Rolling element arrangement groove 72a First rolling element arrangement groove 72b Second rolling element arrangement groove 73a, 73b A pair of plate members 75 Attachment holes (attachment portions) DESCRIPTION OF SYMBOLS 100 Movable body floating unit 101 Mounting plate 102a, 102b A pair of plate member 105 Mounting hole (mounting part) C axis C1 center ⁇ contact angle

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

Abstract

L'invention concerne un dispositif d'entraînement du type vis et billes qui possède un raccord (7) pour relier de façon axiale un élément d'écrou (3) et un corps mobile par l'intermédiaire d'une pluralité de billes (71). Le raccord (7) possède une rainure de disposition de corps de roulement (72) dans laquelle la pluralité de billes (71) sont disposées dans la direction périphérique d'un arbre fileté (2). La rainure de disposition de corps de roulement (72) est formée soit sous une forme non circulaire, vue dans la direction axiale, soit sous une forme circulaire, vue dans la vue axiale, le centre de la forme circulaire ne coïncidant pas avec l'axe (C) de l'arbre fileté (2).
PCT/JP2016/074010 2015-09-09 2016-08-17 Dispositif d'entraînement du type vis et billes et unité flottante à corps mobile WO2017043277A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2015177619A JP6558163B2 (ja) 2015-09-09 2015-09-09 ボールねじ式駆動装置及び可動体フローティングユニット
JP2015-177619 2015-09-09

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WO2017043277A1 true WO2017043277A1 (fr) 2017-03-16

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JP (1) JP6558163B2 (fr)
TW (1) TW201723349A (fr)
WO (1) WO2017043277A1 (fr)

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Publication number Priority date Publication date Assignee Title
JP6935971B2 (ja) 2017-12-13 2021-09-15 Thk株式会社 ボールねじユニットの診断システムおよびモータ制御システム
JP7339500B2 (ja) 2019-03-25 2023-09-06 株式会社今仙電機製作所 シートスライド装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58109757A (ja) * 1981-12-24 1983-06-30 Hiroshi Teramachi サポ−トベアリング付ボ−ルねじ
JPH03277820A (ja) * 1990-03-23 1991-12-09 T H K Kk ボールねじ装置
JP2016017535A (ja) * 2014-07-04 2016-02-01 本田技研工業株式会社 サスペンション装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58109757A (ja) * 1981-12-24 1983-06-30 Hiroshi Teramachi サポ−トベアリング付ボ−ルねじ
JPH03277820A (ja) * 1990-03-23 1991-12-09 T H K Kk ボールねじ装置
JP2016017535A (ja) * 2014-07-04 2016-02-01 本田技研工業株式会社 サスペンション装置

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JP2017053431A (ja) 2017-03-16
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