WO2023145262A1 - ナット及びボールねじ装置 - Google Patents

ナット及びボールねじ装置 Download PDF

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Publication number
WO2023145262A1
WO2023145262A1 PCT/JP2022/044869 JP2022044869W WO2023145262A1 WO 2023145262 A1 WO2023145262 A1 WO 2023145262A1 JP 2022044869 W JP2022044869 W JP 2022044869W WO 2023145262 A1 WO2023145262 A1 WO 2023145262A1
Authority
WO
WIPO (PCT)
Prior art keywords
nut
axial direction
rib
seating surface
crimping
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2022/044869
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
秀平 弓場
靖巳 渡辺
泰明 阿部
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NSK Ltd
Original Assignee
NSK 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 NSK Ltd filed Critical NSK Ltd
Priority to CN202280028879.3A priority Critical patent/CN117157476A/zh
Priority to JP2023540535A priority patent/JP7428299B2/ja
Priority to US18/288,726 priority patent/US12196292B2/en
Priority to EP22924114.6A priority patent/EP4317747A4/en
Publication of WO2023145262A1 publication Critical patent/WO2023145262A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • 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
    • F16H25/2214—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members with balls with elements for guiding the circulating 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
    • F16H25/22—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 disclosure relates to nuts and ball screw devices.
  • a ball screw device includes a nut, a screw shaft passing through the nut, and a plurality of balls rolling on a track between the nut and the screw shaft.
  • the nut has a nut body and a circulation component.
  • the circulating component is a component that circulates the balls that have moved from one end of the track to the other end of the track to one end of the track.
  • the middle deflector is generally arranged in a recess provided on the outer peripheral surface of the nut body.
  • a through hole extending in the axial direction from the end surface of the nut body is provided in each of the nut body and the middle deflector. A pin is inserted into the through hole. Therefore, the middle deflector is caught on the pin and does not separate from the nut body.
  • the pin fixing method increases the number of parts. Moreover, through holes are required in the nut body and the circulation parts, which limits the layout. Therefore, it is desired to develop a nut that can fix the circulating parts by a method other than the pin.
  • the present disclosure has been made in view of the above, and aims to provide a nut and ball screw device capable of suppressing an increase in the number of parts.
  • a nut in order to achieve the above object, includes a cylindrical nut body through which a screw shaft penetrates, and a circulation component assembled to the nut body.
  • the nut body is a recess provided on the outer peripheral surface of the nut body, and has an arcuate receiving portion when viewed in an axial direction parallel to the screw shaft, a seat surface forming a bottom surface of the receiving portion, and the seat. a through hole penetrating through the surface and the inner peripheral surface of the nut body; and a pair of opposing side surfaces disposed on both sides of the accommodating portion in the axial direction parallel to the screw shaft.
  • a direction parallel to the seat surface when viewed from the axial direction is a seat surface direction.
  • the circulating component includes: a circulating component main body arranged in the accommodating portion and the through hole; an arm portion extending from the circulating component main body in the direction of the seat surface and in contact with the seat surface; It has a rib that protrudes in the vertical direction and extends along the side surface in the seat surface direction, and a crimped portion that is formed by crimping at least a part of the rib toward the side surface.
  • the pair of side surfaces are provided with recesses, which are grooves extending in the seat surface direction, face the ribs in the axial direction, and receive the crimped portions.
  • the circulation component when a load in the first vertical direction acts on the circulation component, the caulking portion is caught in the recess. Therefore, the circulating component is not displaced in the first vertical direction. That is, the circulating component does not separate from the nut body.
  • the through hole penetrates a central portion of the seat surface in the seat surface direction.
  • the seat surface has a first seat surface arranged on one side of the seat surface direction relative to the through hole, and a second seat surface arranged on the other side of the seat surface direction relative to the through hole.
  • the arm extends from the circulating component main body in one direction of the seating surface and contacts the first seating surface, and the arm extends from the circulating component main body in the other direction of the seating surface and extends from the second arm. and a second arm that contacts the seat surface.
  • the rib and the crimping portion are provided on each of the first arm portion and the second arm portion.
  • the circulation part may tilt.
  • the circulating component tilts means that a part of the circulating component main body has fallen into the through hole and the arm part is lifted from the seat surface.
  • the tongue is misaligned. Therefore, the ball cannot be scooped up smoothly.
  • the circulation component has the first arm and the second arm. In other words, the circulating component is in contact with the seat surface on both sides in the seat surface direction across the through hole. Therefore, the posture of the circulating parts is stabilized, and the balls are smoothly scooped up.
  • the crimped portion is provided on each arm and there are many crimped portions, it is possible to firmly prevent the circulating component from coming off.
  • the pair of side surfaces are composed of a first side surface arranged on one side of the circulating component in the axial direction and a second side surface arranged on the other side of the circulating component in the axial direction. and have The ribs have first ribs extending along the first side surface and second ribs extending along the second side surface.
  • the crimped portion is a part of the first rib and is crimped toward the first side surface, and the crimped portion is a portion of the second rib and is crimped toward the second side surface. and a second crimped portion crimped to.
  • the crimping portion has a first crimping portion that engages with the recess on the first side surface and a second crimping portion that engages with the recess on the second side surface. can be strengthened.
  • the nut body has a return path extending in the axial direction.
  • the first side has an opening for the return path.
  • the circulation component main body has a ball passage in which balls roll, and a first opposing surface provided with an opening of the ball passage and facing the first side surface.
  • the axial thickness of the second rib is smaller than the axial thickness of the first rib.
  • the second rib which has a smaller thickness in the axial direction, begins to collapse (begin to deform) earlier than the first rib.
  • the crimped portion of the second rib comes into contact with the recess before the first rib and further presses the recess.
  • the second rib receives a reaction force from the inner surface of the recess, and the circulation component moves toward the first side surface. Therefore, the first facing surface and the first side surface are in contact with each other, and the ball passage and the return passage are continuous. This makes the movement of the ball smooth.
  • the nut body has a return path extending in the axial direction.
  • the first side has an opening for the return path.
  • the circulation component main body has a ball passage in which balls roll, and a first opposing surface provided with an opening of the ball passage and facing the first side surface.
  • the first rib has a first crimping surface that faces the other axial direction and is crimped when forming the first crimping portion. The first crimping surface is inclined so as to approach the first side surface as it goes in the first vertical direction.
  • first crimping surface When the inclined surface (first crimping surface) is crimped with a jig, part of the crimping load (load in the direction of the first side surface) is converted into a load perpendicular to the seat surface. That is, the load acting on the first rib in the direction of the first side surface is reduced.
  • the first rib since the first rib is thick on the base side (portion near the arm), it has high rigidity, and the first rib is difficult to deform. From the above, when the first rib and the second rib are crimped at the same time, the first rib collapses (deforms) later than the second rib.
  • the crimped portion of the second rib comes into contact with the recess before the first rib and presses the recess.
  • the second rib receives a reaction force from the inner surface of the recess, and the circulation component moves toward the first side surface. Therefore, the first facing surface and the first side surface are in contact with each other, and the ball passage and the return passage are continuous. This makes the movement of the ball smooth.
  • the nut body has a return path extending in the axial direction.
  • the pair of side surfaces has a first side surface located on one side of the circulation component in the axial direction, and a second side surface located on the other side of the circulation component in the axial direction.
  • the first side has an opening for the return path.
  • the circulation component main body has a ball passage in which balls roll, a first opposing surface provided with an opening of the ball passage, and facing the first side surface, and the circulation component main body facing the second side surface. and a second facing surface.
  • the second facing surface is provided with at least one or more protrusions that protrude in the other axial direction and abut against the second side surface. The convex portion is crushed between the circulation component body and the second side surface.
  • the convex portion is crushed between the circulating component and the second side surface, and the circulating component is arranged closer to the first side surface. That is, the circulating component is arranged near the first side surface, and the first opposing surface and the first side surface are in contact with each other. As a result, the ball path and the return path are continuous, and the ball moves smoothly.
  • the nut body has a positioning hole that is recessed in the axial direction from the side surface and opens to the outer peripheral surface of the nut body.
  • the circulatory component main body has a positioning projection that protrudes in the axial direction and is inserted into the positioning hole.
  • the circulating component is not displaced in the seat surface direction.
  • the length of the arm in the direction of the seating surface is longer than the length of the rib in the direction of the seating surface.
  • the portion that abuts on the seat surface is increased, and the posture of the circulation component is more stable.
  • the circulation component main body has an outer peripheral surface facing radially outward.
  • the distance from the axial center to the outer peripheral surface of the circulating component main body is equal to or less than the outer diameter of the nut main body.
  • the circulation component does not protrude outside the outer peripheral surface of the nut body. Therefore, an increase in size of the nut is avoided.
  • the seat surface is an edge of the through hole and has an extended seat surface arranged in the axial direction with respect to the through hole.
  • the circulation component body has an extended seating surface that abuts the extended seating surface.
  • the number of parts that come into contact with the seat surface is increased, and the posture of the circulating component is further stabilized. Therefore, the ball can be scooped up smoothly.
  • a mark is attached to the outer peripheral surface of the circulating component body to indicate the mounting direction of the circulating component body with respect to the accommodating portion.
  • a ball screw device includes the nut, a screw shaft penetrating the nut, and a plurality of screw shafts arranged between the nut and the screw shaft. With a ball.
  • the circulation component does not separate from the nut body.
  • pins for fixing circulating parts are not required, and an increase in the number of parts is suppressed.
  • FIG. 1 is a side view of the ball screw device of Embodiment 1 as seen from a direction perpendicular to the axial direction.
  • FIG. 2 is a cross-sectional view of the nut of Embodiment 1 cut in the axial direction.
  • FIG. 3 is a cross-sectional view of the nut body taken along line III-III of FIG. 1 and viewed in the direction of the arrow. 4 is a side view seen from the direction of arrow IV in FIG. 3.
  • FIG. 5 is a side view seen from the direction of arrow V in FIG. 3.
  • FIG. 8 is a perspective view of the middle deflector before crimping according to the first embodiment, viewed from the first vertical direction.
  • FIG. 9 is a perspective view of the middle deflector before crimping according to the first embodiment, viewed from the second vertical direction.
  • 10 is a cross-sectional view taken along line XX of FIG. 6.
  • FIG. 11 is a cross-sectional view taken along the line XI-XI in FIG. 6.
  • FIG. 12 is a side view seen from the direction of arrow XII in FIG. 6.
  • FIG. FIG. 13 is a perspective view showing a preparatory step of the assembling method of Embodiment 1.
  • FIG. 14 is a side view of the state before crimping in the crimping step of the assembling method of Embodiment 1, as seen from the direction of the second seat surface.
  • FIG. 15 is a side view of the state after crimping in the crimping step of the assembling method of Embodiment 1, as seen from the direction of the second seat surface.
  • FIG. 16 is a plan view of the crimping process of Embodiment 1 viewed from the first vertical direction.
  • FIG. 17 is a perspective view of a state of crimping with two jigs in the crimping process of the first embodiment.
  • FIG. 18 is a side view of the nut of Embodiment 2, in a state before crimping the ribs, viewed from the direction of the second seat surface.
  • FIG. 19 is a side view of the nut of Embodiment 2, after crimping the ribs, as seen from the direction of the second seat surface.
  • FIG. 20 is a side view of the nut of Embodiment 3, viewed from the direction of the second seat surface, before crimping the ribs.
  • FIG. 21 is a side view of the nut of Embodiment 3 after crimping the ribs, as seen from the direction of the second seat surface.
  • 22 is a perspective view of the middle deflector of Embodiment 4 as seen from the second axis direction.
  • FIG. 23 is an enlarged view of the gap between the second side surface and the second opposing surface of the nut of Embodiment 4, viewed from the first vertical direction.
  • FIG. 24 is a perspective view of the middle deflector of Embodiment 5.
  • FIG. 25 is a side view of the middle deflector of Embodiment 6 as seen from the first axis direction.
  • FIG. 26 is a cross-sectional view of the middle deflector of Embodiment 6 taken along a plane extending in the seat surface direction and the vertical direction.
  • FIG. 27 is a side view of the middle deflector of Embodiment 7 as seen from the first axis direction.
  • FIG. 1 is a side view of the ball screw device of Embodiment 1 as seen from a direction perpendicular to the axial direction.
  • the ball screw device 100 includes a nut 101, a screw shaft 102 passing through the nut 101, a plurality of balls 103 (see FIG. 2) arranged between the nut 101 and the screw shaft 102, It has
  • the screw shaft 102 is a cylindrical part made of steel.
  • a spiral outer raceway surface 102a is provided on the outer peripheral surface of the screw shaft 102 .
  • a direction parallel to the axis O of the screw shaft 102 will be referred to as an axial direction.
  • the ball screw device 100 is a device that converts rotary motion into linear motion and linear motion into rotary motion.
  • an inner ring 104 is provided on the outer peripheral surface of the nut 101 . Further, the inner ring 104 is arranged on the outer peripheral surface of the nut 101 toward the end in the axial direction.
  • the direction in which the inner ring 104 is arranged when viewed from the axial center of the nut 101 is referred to as a first axial direction (one of the axial directions) X1.
  • a direction opposite to the first axial direction X1 is referred to as a second axial direction (the other axial direction) X2.
  • the inner ring 104 is one part of the bearing that supports the nut 101 so that it can rotate.
  • the outer peripheral surface of the inner ring 104 is provided with an outer peripheral raceway surface 105 on which the balls roll. Therefore, in this embodiment, the nut 101 is rotatably supported by a housing (not shown) or the like, and the screw shaft 102 linearly moves in the axial direction. That is, the ball screw device 100 of this embodiment is designed to convert rotary motion into linear motion.
  • the nut with the inner ring integrally formed is exemplified, but the present disclosure may be a nut with the inner ring not integrally formed. Also, the present disclosure may be applied to a ball screw device that converts linear motion into rotary motion.
  • FIG. 2 is a cross-sectional view of the nut of Embodiment 1 cut in the axial direction.
  • the nut 101 includes a nut body 1 and a middle deflector (circulator) 30 and an end deflector 110 assembled to the nut body 1 .
  • the nut body 1 is a cylindrical part made of steel.
  • An inner peripheral surface 2 of the nut body 1 is provided with a spiral inner peripheral raceway surface 3 .
  • a spiral raceway 106 is formed between the inner raceway surface 3 and the outer raceway surface 102a.
  • a plurality of balls 103 are arranged on this track 106 . When the nut 101 rotates, the balls 103 roll on the inner raceway surface 3 and the outer raceway surface 102a and move along the raceway 106 in the spiral direction.
  • a first accommodating portion (accommodating portion) 5 recessed radially inward from the outer peripheral surface 4 of the nut body 1 is provided on the outer peripheral surface 4 of the nut body 1 and near the end in the second axial direction X2.
  • a second accommodating portion 7 recessed in the second axial direction X2 is provided on the end face 6 of the nut body 1 in the first axial direction X1.
  • a return path 8 is provided through the nut body 1 in the axial direction so as to communicate between the first receiving portion 5 and the second receiving portion 7 .
  • the middle deflector 30 is housed in the first housing portion 5 .
  • the end deflector 110 is housed in the second housing portion 7 .
  • the balls 103 that have moved along the track 106 in the second axial direction X2 are scooped up by the middle deflector 30 and guided to the return path 8.
  • the ball 103 rolls on the return path 8 in the first axial direction X1 and enters the end deflector 110 .
  • the end deflector 110 circulates the ball 103 to the end of the track 106 in the first axial direction X1.
  • the end deflector 110 scoops up the balls 103 from the track 106, and the middle deflector 30 circulates the balls 103 to the rolling path. This keeps the ball 103 rolling on the track 106 .
  • middle deflector 30 and the end deflector 110 are provided as two circulating parts, but in the present disclosure, both of them may be middle deflectors (circulating parts).
  • middle deflectors circulating parts
  • Fig. 3 is a cross-sectional view of the nut body taken along line III-III in Fig. 1 and viewed in the direction of the arrow.
  • the nut body 1 includes a first housing portion 5 , a seat surface 10 forming the bottom surface of the first housing portion 5 , a through hole 17 penetrating the seat surface 10 , and the first housing portion 5 . and a pair of side surfaces 20 (only one of which is shown in FIG. 3) arranged on opposite sides in the axial direction.
  • the first housing portion 5 is a space having a bow shape when viewed from the axial direction.
  • the arcuate shape is a shape formed by combining an arc portion overlapping the outer peripheral surface 4 of the nut body 1 and a straight portion overlapping the bearing surface 10 (a straight portion connecting both ends of the arc portion) when viewed from the axial direction. is.
  • the seat surface 10 is a surface on which the middle deflector 30 abuts (seats). Moreover, the seat surface 10 is a plane perpendicular to the imaginary line K1 extending radially from the axis O when viewed from the axial direction.
  • the direction in which the seat surface 10 extends when viewed from the axial direction (the direction orthogonal to the virtual line K1 and the axial direction) is referred to as the seat surface direction.
  • the direction parallel to the imaginary line K1 (the direction perpendicular to the seating surface) is called the vertical direction.
  • the direction in which the seat surface 10 faces is referred to as a first vertical direction Z1.
  • a direction opposite to the first vertical direction Z1 is referred to as a second vertical direction Z2.
  • the seat surface 10 extends in a direction perpendicular to the axis O when viewed from the outer peripheral side (see FIG. 4).
  • the through hole 17 extends vertically and penetrates the bearing surface 10 and the inner peripheral surface 2 of the nut body 1 . Further, the through-hole 17 penetrates the central portion of the seat surface 10 in the seat surface direction.
  • the seat surface 10 includes a first seat surface 11 arranged on one side of the seat surface direction from the through hole 17, a second seat surface 12 arranged on the other side of the seat surface direction from the through hole 17, are divided into
  • the seat surface direction the direction in which the first seat surface 11 is arranged when viewed from the through hole 17 is referred to as a first seat surface direction Y1.
  • a direction opposite to the first seating surface direction Y1 is referred to as a second seating surface direction Y2.
  • FIG. 4 is a side view seen from the direction of arrow IV in FIG.
  • the through hole 17 has a rectangular shape when viewed from the first vertical direction Z1.
  • the through hole 17 penetrates through the center portion of the seat surface 10 in the axial direction.
  • the axial length L1 of the through hole 17 is shorter than the axial length L2 of the seat surface 10 .
  • the seat surface 10 has an extended seat surface 13 that forms an edge portion 17 a of the through hole 17 and adjoins the through hole 17 on both sides in the axial direction.
  • the four corners of the through-hole 17 in this embodiment are rectangular, they may be rounded corners.
  • the through-hole 17 is not limited to a rectangular shape.
  • the extended seat surface 13 includes a first extended seat surface 14 arranged in the first axial direction X1 with respect to the through hole 17, a second extended seat surface 15 arranged in the second axial direction X2 with respect to the through hole 17, have.
  • the first extended seat surface 14 and the second extended seat surface 15 respectively extend in the seat surface direction and are connected to the first seat surface 11 and the second seat surface 12 at both ends.
  • the extended seat surface 13 only needs to be able to abut (seat on) the middle deflector 30, and does not need to be continuous in the seat surface direction as in the embodiment. Therefore, the present disclosure may be an extended seat surface that is partially notched in the seat surface direction and is not continuous in the seat surface direction.
  • the pair of side surfaces 20 includes a first side surface 20a arranged in the first axial direction X1 with respect to the seat surface 10 and a second side surface 20a arranged in the second axial direction X2 with respect to the seat surface 10. 20b and .
  • the first side surface 20a and the second side surface 20b are axially opposed to each other.
  • the details of the pair of side surfaces 20 will be described below, but the technical content common to the first side surface 20a and the second side surface 20b will be mainly described as the "side surface 20".
  • each will be the subject of the description.
  • the side surface 20 has an arcuate shape. Therefore, the side surface 20 has an arc-shaped outer peripheral edge portion 21 .
  • the side surface 20 is provided with a concave portion 22 that is axially recessed from the side surface 20 and extends in the bearing surface direction. One end of the concave portion 22 extends to the outer peripheral edge portion 21 . Therefore, the concave portion 22 opens toward the first housing portion 5 and toward the outer peripheral side of the nut body 1 .
  • Two recesses 22 are provided for one side surface 20 .
  • One of the two recesses 22 is arranged in the first seating surface direction Y1 relative to the through hole 17 and is opened in the first seating surface direction Y1 by cutting out the outer peripheral edge portion 21 .
  • the other of the two recesses 22 is arranged in the second seating surface direction Y2 relative to the through hole 17, and is opened in the second seating surface direction Y2 by notching the outer peripheral edge portion 21.
  • the two recessed portions 22 provided on one side surface 20 are distributed to one side and the other side in the seating surface direction with the through hole 17 as a boundary.
  • FIG. 5 is a side view seen from the direction of arrow V in FIG.
  • the recess 22 is separated from the seat surface 10 in the first vertical direction Z1.
  • the cross-sectional shape of the recess 22 is triangular. Therefore, the inner surface of the concave portion 22 has a first slope 23 that separates from the first accommodating portion 5 in the first vertical direction Z1 and a second slope 24 that approaches the first accommodating portion 5 in the first vertical direction Z1. ,have.
  • the recessed portion 22 provided on the first side surface 20a is referred to as the first recessed portion 22a
  • the recessed portion 22 provided on the second side surface 20b is referred to as the second recessed portion 22b
  • the first slope 23 and the second slope 24 provided in the first concave portion 22a are referred to as a first slope 23a and a second slope 24a
  • the first slope 23 and the second slope 24 provided in the second concave portion 22b are referred to as a first slope 23b and a second slope 24b.
  • the first side surface 20a is provided with an opening 8a, which is the entrance/exit of the return path 8, and a positioning hole 26.
  • the positioning hole 26 is a hole recessed in the first axial direction X1 from the first side surface 20a.
  • the positioning hole 26 also opens toward the outer peripheral surface 4 of the nut body 1 .
  • the inner surface of the positioning hole 26 includes a pair of opposing surfaces 26a sandwiching the positioning hole 26 from the seat surface direction, a side surface 26b arranged in the first axial direction X1 with respect to the positioning hole 26, and a second direction perpendicular to the positioning hole 26. and a bottom surface 26c located at Z2.
  • the middle deflector 30 will be explained.
  • FIG. 6 is an enlarged view of the middle deflector in FIG. 1 and its periphery.
  • the middle deflector 30 is a metal part manufactured by a method such as metal powder injection molding, cutting, or forging. As shown in FIG. 6 , the middle deflector 30 is arranged in the first accommodating portion 5 . Therefore, when viewed from the outer peripheral side, the middle deflector 30 extends in the same direction as the first accommodating portion 5 (the seat surface 10) (the direction perpendicular to the axis O; see FIG. 4).
  • the middle deflector 30 includes a deflector body (recirculation part body) 31, an arm portion 50 projecting from the deflector body 31 toward the seating surface, a rib 60 projecting from the arm portion 50 in the first vertical direction Z1, and one portion of the rib 60. and a crimping portion 70 formed by crimping a portion.
  • the crimped portion 70 is formed by crimping the rib 60 when the middle deflector 30 is attached to the nut body 1 . Therefore, the drawing showing the middle deflector 30 before assembly does not show the crimping portion 70 .
  • FIG. 7 is a cross-sectional view taken along line VII-VII in FIG.
  • a ball passage 34 through which the ball 103 passes is provided inside the deflector body 31 .
  • the deflector main body 31 has a main body portion 32 arranged in the first housing portion 5 and a scooping portion 33 arranged in the through hole 17 .
  • the ball passage 34 extends in the tangential direction (see the virtual line K2) of the virtual circle C connecting the centers of the balls 103 on the track 106 .
  • the scooping part 33 is provided with a tongue 35 for scooping up the ball 103 from the track 106 .
  • An outer peripheral surface 32a of the body portion 32 in the first vertical direction Z1 is arcuate. Further, the outer peripheral surface 32 a of the body portion 32 overlaps the outer peripheral surface 4 of the nut body 1 when viewed from the axial direction. That is, the distance from the axis O to the outer peripheral surface 32 a of the middle deflector 30 is the same as the outer diameter of the nut body 1 . Therefore, the middle deflector 30 does not protrude from the first accommodation portion 5 .
  • FIG. 8 is a perspective view of the middle deflector before crimping according to Embodiment 1, viewed from the first vertical direction.
  • FIG. 9 is a perspective view of the middle deflector before crimping according to the first embodiment, viewed from the second vertical direction.
  • 10 is a cross-sectional view taken along line XX of FIG. 6.
  • FIG. 11 is a cross-sectional view taken along the line XI-XI in FIG. 6.
  • FIG. 12 is a side view seen from the direction of arrow XII in FIG. 6.
  • the body portion 32 has a first opposing surface 36 as a side surface facing the first axial direction X1.
  • the first facing surface 36 faces the first side surface 20a.
  • An opening 37 serving as an entrance to the ball passage 34 is provided in the first opposing surface 36 .
  • the opening 37 is continuous (adjacent) to the opening 8a of the return path 8 in the axial direction. This allows the ball 103 to move from the ball passage 34 to the return passage 8 or from the return passage 8 to the ball passage 34 .
  • the opening 8a and the opening 37 are chamfered (see FIGS. 2 and 10). It should be noted that the present disclosure relates to the chamfering of the openings 8a and the openings 37, and may be corner chamfering instead of the R chamfering.
  • the first opposing surface 36 is provided with positioning projections 38 projecting in the first axial direction X1.
  • the positioning projection 38 has a quadrangular prism shape. As shown in FIG. 6, the positioning projections 38 are inserted into the positioning holes 26. As shown in FIG. The positioning protrusions 38 are in contact with the pair of facing surfaces 26a of the positioning holes 26. As shown in FIG. Therefore, the middle deflector 30 is regulated so as not to be displaced in the direction of the seating surface from the predetermined assembly position.
  • the tip surface 38a of the positioning projection 38 is separated from the side surface 26b of the positioning hole 26. As shown in FIG. That is, a gap S10 is formed between the tip surface 38a and the side surface 26b. According to this, when the positioning protrusion 38 is manufactured larger than the predetermined protrusion amount, the manufacturing error is absorbed by the gap S10. In other words, it is avoided that the positioning protrusion 38 hits the side surface 26b of the positioning hole 26 and the first side surface 20a and the first opposing surface 36 are separated from each other.
  • the separation between the first side surface 20a and the first opposing surface 36 causes separation between the opening 8a of the return path 8 and the opening 37 of the ball passage 34, and the delivery of the ball 103 is not performed smoothly. Therefore, in order to transfer the ball 103 smoothly, it is desirable that the first side surface 20a and the first opposing surface 36 are in contact with each other.
  • the bottom surface 38b of the positioning projection 38 is separated from the bottom surface 26c of the positioning hole 26. That is, a gap S11 is formed between the bottom surface 38b and the bottom surface 26c. According to this, when the positioning projection 38 is manufactured to have a thickness greater than a predetermined amount in the vertical direction, the manufacturing error is absorbed by the gap S11. Therefore, it is avoided that the positioning protrusion 38 abuts (gets caught in) the bottom surface 26 d of the positioning hole 26 and the middle deflector 30 does not sit (abut) on the seat surface 10 .
  • the positioning projection 38 and the positioning hole 26 are provided only in the first axial direction X1 with respect to the middle deflector 30. Therefore, when the middle deflector 30 is arranged in the first accommodating portion 5, the positioning protrusion 38 may be erroneously arranged facing the second axial direction X2 (the opening 37 may face the second axial direction). Avoided.
  • the length L3 of the body portion 32 in the seating surface direction is longer than the length L4 of the scooping portion 33 in the seating surface direction.
  • the body portion 32 has a seating surface 40 that faces the second vertical direction Z2 and abuts (seats on) the seating surface 10 .
  • the seating surface 40 has a first seating surface 41 that contacts the first seating surface 11 and a second seating surface 42 that contacts the second seating surface 12 . That is, the middle deflector 30 has seating surfaces 40 on both sides of the through hole 17 in the seating surface direction.
  • the seating surface 40 has an extended seating surface 43 axially disposed relative to the scoop 33 .
  • the extended seating surface 43 includes a first extended seating surface 44 arranged in the first axial direction X1 with respect to the scooping portion 33 and a second extended seating surface 45 arranged in the second axial direction X2 with respect to the scooping portion 33. and have The first extended seating surface 44 abuts the first extended seating surface 14 of the seating surface 10 .
  • the second extended seating surface 45 abuts the second extended seating surface 15 .
  • the body portion 32 has a second opposing surface 46 as a side surface facing the second axial direction X2.
  • the second facing surface 46 faces the second side surface 20b. Further, the second facing surface 46 is flat.
  • the axial length L5 of the main body portion 32 is slightly smaller than the axial width L7 of the first accommodating portion 5 . That is, a minute gap (not shown) is generated between the first side surface 20a and the first opposing surface 36, between the second side surface 20b and the second opposing surface 46, or between both. Therefore, the middle deflector 30 can be reliably accommodated in the first accommodating portion 5 .
  • the arm portion 50 includes a first arm portion 51 extending from the body portion 32 in the first seating direction Y1, a second arm portion 52 extending from the body portion 32 in the second seating direction Y2, have.
  • the first arm portion 51 has a first arm seating surface 53 as a side surface facing the second vertical direction Z2.
  • the second arm portion 52 has a second arm seating surface 54 as a side surface facing the second vertical direction Z2.
  • the arm first seating surface 53 is in contact with the first seating surface 11 .
  • the second arm seating surface 54 is in contact with the second seating surface 12 .
  • the ribs 60 will be described. As shown in FIG. 6, the ribs 60 are provided on each of the first arm portion 51 and the second arm portion 52 . Therefore, in the following description, the rib 60 provided on the second arm portion 52 will be described, and the description of the first arm portion 51 will be omitted.
  • the rib 60 is a ridge that protrudes from the plane 55 of the second arm portion 52 facing the first vertical direction Z1 and extends linearly in the bearing surface direction.
  • the length of the rib 60 in the bearing surface direction is the same as that of the second arm portion 52 .
  • An end portion of the rib 60 in the first seating surface direction Y1 is connected to the main body portion 32 (the deflector main body 31).
  • the end portion of the rib 60 that is connected to the main body portion 32 will be referred to as a base portion 60a, and the opposite end portion will be referred to as a tip portion 60b.
  • the ribs 60 include a first rib 61 extending along the edge of the plane 55 in the first axial direction X1, a second rib 62 extending along the edge of the plane 55 in the second axial direction X2, have.
  • the first rib 61 extends along the first side surface 20a and is axially adjacent to the first recess 22a (see FIG. 14).
  • the second rib 62 also extends along the second side surface 20b and is axially adjacent to the second recess 22b of the second side surface 20b (see FIG. 14).
  • the crimped portion 70 is formed by crimping a rib 60 extending along the side surface 20 to the side surface 20 .
  • a crimping portion 70 is provided only at the tip portion 60 b of the rib 60 .
  • the crimping portion 70 has a first crimping portion 71 provided on the first rib 61 and a second crimping portion 72 provided on the second rib 62 .
  • the first crimping portion 71 is inserted into the first concave portion 22a. Further, the first crimping portion 71 has a shape along the inner surface of the first recess 22a. Specifically, the first crimping portion 71 is inclined so as to be positioned in the first axial direction X1 from the plane 55 toward the first vertical direction Z1. A side surface 71a of the first crimping portion 71 facing in the first axial direction X1 is in contact with the first slope 23a. An end surface 71b of the first crimping portion 71 facing the first vertical direction Z1 is in contact with the second slope 24a.
  • the second crimping portion 72 is inserted into the second concave portion 22b.
  • the second crimping portion 72 has a shape along the inner surface of the second concave portion 22b. Specifically, the second crimping portion 72 is inclined so as to be positioned in the second axial direction X2 from the plane 55 toward the first vertical direction Z1. A side surface 72a of the second crimping portion 72 facing in the second axial direction X2 is in contact with the first slope 23b. An end surface 72b of the second crimping portion 72 facing the first vertical direction Z1 is in contact with the second slope 24b. As described above, the first crimping portion 71 and the second crimping portion 72 are inclined so as to separate from each other in the axial direction toward the first vertical direction Z1.
  • the middle deflector 30 of this embodiment is formed by combining two parts (an inner peripheral part 81 and an outer peripheral part 82) divided along a dividing plane 80.
  • FIG. 7 the dividing surface 80 extends axially.
  • the dividing surface 80 is parallel to the tangent line (see the virtual line K2) to the virtual circle C when viewed from the axial direction. That is, the dividing surface 80 is inclined so as to be positioned in the first vertical direction Z1 toward the first seating surface direction Y1.
  • the inner peripheral side part 81 the outer peripheral side part 82 arranged on the outer peripheral side of the dividing surface 80 will be referred to. .
  • each configuration of the middle deflector 30 is divided into an inner peripheral side part 81 and an outer peripheral side part 82 with a dividing surface 80 as a boundary line.
  • the inner peripheral part 81 has a first arm 51, a tongue 35 and an extended seating surface 43 (see FIG. 9).
  • the outer peripheral part 82 has a second arm portion 52 .
  • the end surface of the inner peripheral part 81 extending along the dividing surface 80 is hereinafter referred to as an inner peripheral dividing surface 83 .
  • An end surface of the outer peripheral part 82 extending along the dividing surface 80 is referred to as an outer peripheral dividing surface 84 .
  • the dividing surface 80 overlaps the outer peripheral side of the ball passage 34 . Therefore, as shown in FIG. 11, the inner peripheral side parting surface 83 of the inner peripheral side component 81 has an inner peripheral side rolling surface that is a C-shaped or U-shaped groove opening in the first vertical direction Z1. 85 is provided. On the other hand, the outer peripheral side dividing surface 84 of the outer peripheral side component 82 is flat. A part of the outer peripheral dividing surface 84 forms an outer peripheral rolling surface 86 that covers the inner peripheral rolling surface 85 from the first vertical direction Z1. In addition, since the outer peripheral side dividing surface 84 is flat, the manufacturing of the outer peripheral side component 82 is facilitated.
  • the inner peripheral part 81 and the outer peripheral part 82 are manufactured separately. Then, the inner peripheral side dividing surface 83 and the outer peripheral side dividing surface 84 are joined, and the inner peripheral side part 81 and the outer peripheral side part 82 are integrated. Note that the joining method includes heat welding, adhesion, and the like.
  • the end of the dividing surface 80 in the first bearing surface direction Y1 extends in the first vertical direction Z1.
  • a stepped surface 87 extending in the first vertical direction Z1 and facing the second seating surface direction is provided at the end portion of the inner circumferential dividing surface 83 in the first seating surface direction Y1.
  • an end surface 88 extending in the first vertical direction Z1 and facing the first seating surface direction Y1 is provided at the end portion of the outer circumferential dividing surface 84 in the first seating surface direction Y1.
  • the step surface 87 and the end surface 88 are in contact with each other. Therefore, when the inner peripheral side part 81 and the outer peripheral side part 82 are joined, they are regulated so as not to be displaced in the seat surface direction.
  • the assembling method S includes a preparation step S1 and a crimping step S2.
  • FIG. 13 is a perspective view showing a preparatory step for the assembly method of Embodiment 1.
  • FIG. The preparation step S ⁇ b>1 is a step of seating the middle deflector 30 on the seating surface 10 of the nut body 1 .
  • the middle deflector 30 is arranged in the first vertical direction Z1 of the first receiving portion 5 of the nut body 1 .
  • the posture of the middle deflector 30 is such that the seating surface 40 (not shown in FIG. 13) and the scooping portion 33 face the first accommodating portion 5 .
  • the positioning protrusion 38 of the middle deflector 30 is directed in the first axial direction X1.
  • the middle deflector 30 of this embodiment has the positioning projection 38, if the middle deflector 30 does not have the positioning projection 38, the opening 37 instead of the positioning projection 38 faces the first axial direction X1.
  • the middle deflector 30 is moved in the second vertical direction Z2 (see arrow A1 in FIG. 13), and the middle deflector 30 is inserted into the first accommodating portion 5. Also, the middle deflector 30 is adjusted in the axial direction and the seat surface direction so that the scooping portion 33 is inserted into the through hole 17 and the positioning projection 38 is inserted into the positioning hole 26 . After the scooping portion is inserted into the through hole 17 and the positioning projection 38 is inserted into the positioning hole 26, when the middle deflector 30 is further moved in the second vertical direction Z2, the seating surface 40 of the middle deflector 30 is seated. It abuts on surface 10 . Thereby, the middle deflector 30 is seated on the seat surface 10, and the preparatory step S1 is finished.
  • FIG. 14 is a side view of the state before crimping in the crimping step of the assembling method of Embodiment 1, viewed from the direction of the second seat surface.
  • the caulking step S2 is a step of caulking the ribs 60 with the jig 120 .
  • the amount of gap in the axial direction between the first rib 61 and the second rib 62 is L8.
  • the jig 120 includes a head portion 121 inserted between the first rib 61 and the second rib 62, and a grip portion 122 arranged in the first vertical direction Z1 of the head portion 121.
  • a tip portion 123 is provided at the end portion of the head portion 121 in the second vertical direction Z2. The width of the tip portion 123 in the axial direction becomes narrower toward the second vertical direction Z2.
  • the distal end portion 123 has a distal end surface 124 facing the second vertical direction Z2, a first pressing surface 125 facing the first axial direction X1, and a second pressing surface 126 facing the second axial direction X2.
  • An axial width L9 of the tip end surface 124 is smaller than a separation distance L8 between the first rib 61 and the second rib 62 .
  • the axial width of the first pressing surface 125 and the second pressing surface 126 gradually increases toward the first vertical direction Z1, and reaches L10 at maximum.
  • a maximum width L10 in the axial direction of the first pressing surface 125 and the second pressing surface 126 is larger than the separation distance L8 between the first rib 61 and the second rib 62 .
  • the tip 123 of the jig 120 is inserted between the first rib 61 and the second rib 62 from the first vertical direction Z1 (see arrow A2 in FIG. 14).
  • the tip surface 124 is inserted between the first rib 61 and the second rib 62, the first pressing surface 125 abuts the first rib 61, and the second pressing surface 126 contacts the first rib 61. 2 abuts on the rib 62 .
  • the tip surface 124 is in a state of floating (separated) from the flat surface 55 of the arm portion 50 .
  • FIG. 15 is a side view of the state after crimping in the crimping step of the assembling method of Embodiment 1, viewed from the direction of the second seat surface. Then, as shown in FIG. 15, the jig 120 is pushed in the second vertical direction Z2, and the tip surface 124 is brought into contact with the flat surface 55. Then, as shown in FIG. Thereby, the first rib 61 is crimped by the first pressing surface 125 in the first axial direction X1. Also, the second rib 62 is crimped in the second axial direction X2 by the second pressing surface 126 .
  • the caulked portion of the first rib 61 tilts toward the first concave portion 22a arranged in the first axial direction X1 to form the first caulked portion 71.
  • the first caulking portion 71 is axially compressed between the inner surface of the first recess 22a and the first pressing surface 125, and has a shape along the inner surface of the first recess 22a. That is, the first crimping portion 71 has a side surface 71a extending along the first slope 23a and an end surface 71b extending along the second slope 24a.
  • the crimped portion of the second rib 62 tilts toward the second recessed portion 22b arranged in the second axial direction X2 to form a second crimped portion 72.
  • the second crimping portion 72 is axially compressed between the inner surface of the second recess 22b and the second pressing surface 126, and has a shape along the inner surface of the first recess 22a. That is, the second crimping portion 72 has a side surface 72a extending along the first slope 23b and an end surface 72b extending along the second slope 24b.
  • the jig 120 is removed in the first vertical direction Z1, and the crimping step S2 is completed.
  • FIG. 16 is a plan view of the caulking process of Embodiment 1 viewed from the first vertical direction.
  • the portion to be crimped by the jig 120 is not the entire rib 60 but the tip portion 60b of the rib 60.
  • the base portion 60a of the rib 60 is connected to the deflector body 31 and is unlikely to tilt. Further, if the base portion 60a of the rib 60 is forcibly crimped, the deflector body 31 may be deformed.
  • the first crimped portion 71 and the second crimped portion 72 form a substantially V shape when viewed from the first vertical direction Z1.
  • the first crimped portion 71 and the second crimped portion 72 tilt more in the axial direction toward the distal end portion 60b. It should be noted that not only the crimped tip portion 60b but also the center portion of the rib 60 in the bearing surface direction is slightly tilted in the axial direction.
  • the middle deflector 30 receives a load in the direction in which the rib 60 escapes from the load from the jig 120 (see arrows A3 and A4). Specifically, when the rib 60 of the first arm portion 51 is crimped, a load in the second seating surface direction Y2 acts on the middle deflector 30 (see arrow A3). On the other hand, when crimping the rib 60 of the second arm portion 52, a load in the first seating surface direction Y1 acts on the middle deflector 30 (see arrow A4). Therefore, there is a possibility that the positioning protrusion 38 will be deformed and the middle deflector 30 will be displaced.
  • FIG. 17 is a perspective view of a state of crimping with two jigs in the crimping process of Embodiment 1.
  • FIG. 17 it is desirable to prepare two jigs 120 and crimp the ribs 60 of the first arm portion 51 and the ribs 60 of the second arm portion 52 at the same time.
  • the load acting on the first arm portion 51 see arrow A3 in FIG. 16
  • the load acting on the second arm portion 52 see arrow A4 in FIG. 16
  • deformation of the positioning projection 38 is avoided.
  • the inner peripheral side component 81 having the first arm portion 51 and the outer peripheral side component 82 having the second arm portion 52 are in contact with the step surface 87 and the end surface 88 (see FIG. 7). Therefore, even if the first arm portion 51 and the second arm portion 52 are crimped simultaneously with the two jigs 120, the joint between the inner peripheral side part 81 and the outer peripheral side part 82 is not released.
  • the effects of the ball screw device 100 of Embodiment 1 will be described.
  • the middle deflector 30 when a load acts on the middle deflector 30 in the first vertical direction Z1, the caulked portion 70 is caught in the recessed portion 22 . Therefore, the middle deflector 30 is not displaced in the first vertical direction Z1. That is, the middle deflector 30 does not separate from the nut body 1 .
  • the base portion 60a of the rib 60 is connected to the deflector main body 31, and the rib 60 and the crimping portion 70 have high rigidity and are less likely to tilt.
  • the caulked portion 70 is less likely to deform (more likely to tilt). This also prevents the middle deflector 30 from being displaced in the first vertical direction Z1.
  • the crimping portion 70 is provided on each of the first arm portion 51 and the second arm portion 52 . That is, according to the first embodiment, there are more crimping points (crimping portions 70 ) than when only one of the two arm portions 50 is provided with the crimping portion 70 . Therefore, the middle deflector 30 is strongly prevented from coming off.
  • One of the two arms 50 is provided on the inner peripheral part 81 and the other is provided on the outer peripheral part 82 . Therefore, even if the joint between the inner peripheral part 81 and the outer peripheral part 82 is released, the inner peripheral part 81 and the outer peripheral part 82 do not separate from the nut body 1 .
  • the crimping portion 70 has a first crimping portion 71 and a second crimping portion 72 for one arm portion 50 .
  • the middle deflector 30 of the present embodiment includes, as the seating surface 40, a first seating surface 41 and a first arm seating surface 53 arranged in the first seating surface direction Y with respect to the through hole 17, and the through hole 17 A second seating surface 42 and a second arm seating surface 54 are arranged in the second seating surface direction Y2.
  • the middle deflector 30 has seating surfaces 40 on both sides of the through hole 17 in the seating surface direction. Therefore, the deflector main body 31 does not drop into the through hole 17, and the attitude of the middle deflector 30 is stable. As a result, the ball 103 can be scooped up smoothly.
  • the middle deflector 30 also has an extended seating surface 43 that abuts on the extended seating surface 13 of the seating surface 10 . Therefore, the posture of the middle deflector 30 becomes more stable. Further, the extended seating surface 43 is provided on the inner peripheral side component 81 . Therefore, even if the joint between the inner peripheral part 81 and the outer peripheral part 82 is released, the extended seating surface 43 is caught by the extended seating surface 13, and the inner peripheral part 81 is prevented from falling off into the through hole 17. .
  • a dividing surface 80 between the inner peripheral part 81 and the outer peripheral part 82 extends axially along the ball passage 34 . If the dividing plane is in a direction orthogonal to the axial direction (a plane extending in both the bearing surface direction and the vertical direction), the tongue will be divided in the axial direction and the strength of the tongue will be reduced. In other words, in the present embodiment, the ball passage 34 is axially cut to form the inner peripheral side component 81 without dividing the tongue 35 . Therefore, the strength of the tongue 35 is maintained.
  • the ball screw device 100 of Embodiment 1 includes the nut 101 , the screw shaft 102 passing through the nut 101 , and the plurality of balls 103 arranged between the nut 101 and the screw shaft 102 .
  • the nut 101 has a cylindrical shape and includes a nut body 1 through which a screw shaft 102 penetrates, and a circulation component (middle deflector 30 ) assembled to the nut body 1 .
  • the nut body 1 is a recess provided in the outer peripheral surface 4 of the nut body 1, and has an arch-shaped housing portion (first housing portion 5) when viewed from an axial direction parallel to the screw shaft 102, and a bottom surface of the housing portion.
  • a direction parallel to the seat surface when viewed from the axial direction is the seat surface direction.
  • a first vertical direction Z1 is a direction parallel to the perpendicular line (imaginary line K2) to the seat surface and the direction in which the seat surface 10 faces.
  • the circulation component (middle deflector 30) includes a circulation component body (deflector body 31) arranged in the housing portion and the through hole 17, an arm portion 50 extending from the circulation component body in the seat surface direction and in contact with the seat surface, and an arm It has a rib 60 that protrudes from the portion 50 in the first vertical direction Z1 and extends in the seat surface direction along the side surface 20, and a crimped portion 70 formed by crimping at least a part of the rib 60 toward the side surface. ing.
  • the pair of side surfaces 20 are provided with recesses 22 which are grooves extending in the bearing surface direction, axially opposite the ribs 60 and into which the caulking portions 70 are inserted.
  • the circulation component does not separate from the nut body 1.
  • a pin for fixing the circulating part is not required, and an increase in the number of parts is suppressed.
  • the through-hole 17 penetrates the central portion of the seat surface 10 in the seat surface direction.
  • the seat surface 10 has a first seat surface 11 arranged on one side of the seat surface direction relative to the through hole 17, and a second seat surface 12 arranged on the other side of the seat surface direction relative to the through hole 17.
  • the arm portion 50 extends in one direction in the seat surface direction from the circulation component body (deflector body 31) and contacts the first seat surface 11.
  • the first arm portion 51 extends in the other direction in the seat direction from the circulation component body and extends in the second direction. and a second arm portion 52 that abuts on the seat surface 12 .
  • the rib 60 and the crimping portion 70 are provided on each of the first arm portion 51 and the second arm portion 52 .
  • the deflector main body 31 does not fall off into the through hole 17 . Therefore, the posture of the middle deflector 30 is stabilized, and the ball 103 can be scooped up smoothly. In addition, there are many crimped portions (crimped portions 70), and the middle deflector 30 is strongly prevented from coming off.
  • the pair of side surfaces 20 includes a first side surface 20a arranged on one side in the axial direction of the circulation component (middle deflector 30) and a second side surface 20a arranged on the other side in the axial direction of the circulation component. and a side surface 20b.
  • the rib 60 has a first rib 61 extending along the first side surface 20a and a second rib 62 extending along the second side surface 20b.
  • the crimped portion 70 is a part of the first rib 61 and is crimped toward the first side surface 20a, and is a part of the second rib 62 and is crimped toward the second side surface 20b. and a second crimped portion 72 that is crimped in the forward direction.
  • crimped portions 70 there are many crimped portions (crimped portions 70), and the middle deflector 30 is more firmly prevented from coming off.
  • the nut body 1 of Embodiment 1 has a positioning hole 26 that is recessed in the axial direction from the side surface 20 and opens to the outer peripheral surface 4 of the nut body 1 .
  • the circulation component main body deflector main body 31 ) has positioning projections 38 that protrude in the axial direction and are inserted into the positioning holes 26 .
  • the displacement of the middle deflector 30 in the seating surface direction is restricted. Therefore, the tongue 35 is arranged at a predetermined position, and the ball 103 can be scooped up smoothly.
  • the circulating component main body (deflector main body 31) of Embodiment 1 has an outer peripheral surface 32a facing radially outward.
  • the distance from the axis O to the outer peripheral surface 32 a of the middle deflector 30 is equal to or less than the outer diameter of the nut body 1 .
  • the middle deflector 30 does not protrude outside the nut body 1 . Therefore, an increase in size of the nut 101 is avoided.
  • the seat surface 10 of Embodiment 1 is the edge portion 17 a of the through hole 17 and has the extended seat surface 13 arranged in the axial direction with respect to the through hole 17 .
  • the circulation component body (deflector body 31 ) has an extended seating surface 43 that contacts the extended seating surface 13 .
  • Embodiment 1 the number of parts that come into contact with the seat surface 10 is increased, and the posture of the middle deflector 30 is further stabilized. In addition, it is possible to prevent the inner peripheral part 81 from falling off into the through hole 17 .
  • the ball screw device 100 of Embodiment 1 has been described above.
  • the nut 101 of Embodiment 1 has a minute gap between the first side surface 20a and the first opposing surface 36, or between the second side surface 20b and the second opposing surface 46, or between both. (not shown) is occurring. If the gap between the first side surface 20a and the first opposing surface 36 is large, the opening 37 of the ball passage 34 and the opening 8a of the return path 8 will be separated from each other, and the delivery of the ball 103 will not be smooth.
  • Second to fourth embodiments in which this point is improved will be described below. Note that the following description will focus on the changes from the first embodiment.
  • FIG. 18 is a side view of the nut of Embodiment 2, in a state before crimping the ribs, viewed from the direction of the second seat surface.
  • FIG. 19 is a side view of the nut of Embodiment 2, after crimping the ribs, as seen from the direction of the second seat surface.
  • the middle deflector 30A of the second embodiment differs from the middle deflector 30 of the first embodiment in that it includes first ribs 61A and second ribs 62A having different thicknesses in the axial direction.
  • the first arm portion 51 is also provided with the first rib 61A and the second rib 62A.
  • the axial thickness L12 of the second rib 62A is smaller than the axial thickness L11 of the first rib 61A.
  • a first crimped portion 71A is generated as shown in FIG.
  • the second crimped portion 72A is generated.
  • the second rib 62A which has a small thickness in the axial direction and a small rigidity, begins to collapse (begins to deform) earlier than the first rib 61A.
  • the crimped portion of the second rib 62A (second crimped portion 72A) is formed on the inner surface of the recess 22 earlier than the crimped portion of the first rib 61A (first crimped portion 71A). and presses the inner surface of the recess 22 . Therefore, a reaction force (see arrow A5) that opposes the pressing force of the second crimping portion 72A acts on the middle deflector 30A. Then, the middle deflector 30A moves in the first axial direction X1, and the first facing surface 36 comes into contact with the first side surface 20a.
  • the opening 37 of the ball passage 34 and the opening 8a of the return passage 8 are continuous (adjacent), and the delivery of the ball 103 is smooth.
  • FIG. 20 is a side view of the nut of Embodiment 3, viewed from the direction of the second seat surface, before crimping the ribs.
  • FIG. 21 is a side view of the nut of Embodiment 3 after crimping the ribs, as seen from the direction of the second seat surface.
  • the middle deflector 30B of the third embodiment has a first rib 61B and a second rib 62B instead of the first rib 61 and the second rib 62, which is the same as the middle deflector of the first embodiment. 30 different.
  • the first rib 61B has a first crimping surface 61a facing the second axial direction X2.
  • the second rib 62B has a second crimping surface 62a facing the first axial direction X1.
  • the first crimping surface 61a and the second crimping surface 62a face each other.
  • the first caulking surface 61a is an inclined surface that is inclined (toward the first axial direction X1) so as to approach the first side surface 20a toward the first vertical direction Z1.
  • part of the crimping load (load in the first axial direction X1) acting on the first crimping surface 61a is converted into a load in the second vertical direction Z2. be done. That is, the load acting on the first rib 61B in the first axial direction X1 is reduced.
  • the base portion side of the first rib 61B portion near the arm portion 50
  • the first rib 61B and the second rib 62B are crimped together by the jig 120, the first rib 61B collapses later than the second rib 62B. Therefore, the crimped portion (second crimped portion 72B) of the second rib 62B comes into contact with the inner surface of the recess 22 before the first rib 61B, and presses the inner surface of the recess 22 further. As a result, the second crimping portion 72B receives a reaction force (see arrow A7) from the inner surface of the recess 22, the middle deflector 30B moves in the first axial direction X1, and the first opposing surface 36 contacts the first side surface 20a. become in contact.
  • the opening 37 of the ball passage 34 and the opening 8a of the return passage 8 are continuous (adjacent), and the delivery of the ball 103 is smooth.
  • FIG. 4 is a perspective view of the middle deflector of Embodiment 4 as seen from the second axis direction.
  • FIG. 23 is an enlarged view of the gap between the second side surface and the second opposing surface of the nut of Embodiment 4, viewed from the first vertical direction.
  • the middle deflector 30C of the fourth embodiment differs from the middle deflector 30 of the first embodiment in that the second facing surface 46 is provided with a plurality of projections 47. As shown in FIG.
  • the convex portion 47 is a protrusion integrally formed with the middle deflector 30C.
  • the convex portion 47 has a hemispherical shape. Therefore, a cross section obtained by cutting the convex portion 47 along a plane extending in the bearing surface direction and the vertical direction has a circular shape.
  • the amount of projection of the convex portion 47 in the axial direction is larger than the minute gap (tolerance) in the axial direction between the first housing portion 5 and the middle deflector 30C.
  • a plurality of protrusions 47 are provided, but the present disclosure may include at least one protrusion 47 .
  • the shape of the convex portion 47 is not limited to a hemispherical shape, and may be a cylinder, a prism, a pyramid, or a frustum, and is not particularly limited.
  • Embodiments 2 to 4 have been described above, the present disclosure may combine the technical contents of Embodiments 2 to 4. That is, the present disclosure may apply all of the second to fourth embodiments. Alternatively, two of the second to fourth embodiments may be selected and applied.
  • FIG. 5 is a perspective view of the middle deflector of Embodiment 5.
  • FIG. The middle deflector 30D of Embodiment 5 differs from the middle deflector 30 of Embodiment 1 in that the length of the arm portion 50D in the seating surface direction is longer than the length of the rib 60 in the seating surface direction. That is, the distal end portion 50a of the arm portion 50D of the fifth embodiment protrudes further outward in the seat surface direction than the distal end portion 60b of the rib 60.
  • the contact area with the seat surface 10 increases, and the posture of the middle deflector 30D becomes more stable.
  • the middle deflector 30D of the fifth embodiment has positioning projections 38 on both the first facing surface 36 and the second facing surface 46 (not shown in FIG. 24, see FIGS. 11 and 12). , is different from the middle deflector 30 of the first embodiment.
  • positioning holes 26 are also provided on the first side surface 20a and the second side surface 20b of the nut body 1, respectively. According to this, the positioning in the seat surface direction by the middle deflector 30D can be strengthened. Additionally, the present disclosure need not have an extended seating surface 43 (see FIG. 9) like the middle deflector 30D of the fifth embodiment.
  • the positioning protrusions 38 are provided on both the first facing surface 36 and the second facing surface 46, so that the middle deflector 30 can be placed in the first housing portion 5 in the wrong direction. have a nature. Therefore, in the middle deflector 30 ⁇ /b>D of Embodiment 5, a mark is provided on the outer peripheral surface of the deflector body (circulating component body) 31 to indicate the mounting direction of the deflector body (circulating component body) 31 with respect to the first accommodating portion (accommodating portion) 5 . preferably attached.
  • FIG. 25 is a side view of the middle deflector of Embodiment 6 as seen from the first axis direction.
  • FIG. 26 is a cross-sectional view of the middle deflector of Embodiment 6 taken along a plane extending in the seat surface direction and the vertical direction.
  • the middle deflector 30E of the sixth embodiment has an inner peripheral part 81E and an outer peripheral part 82E instead of the inner peripheral part 81 and the outer peripheral part 82. It differs from the middle deflector 30 of the first form.
  • a dividing surface 90 between the inner peripheral side component 81E and the outer peripheral side component 82E includes, when viewed from the axial direction, a slope 91 extending along the ball passage 34 and a radially outer end of both ends of the slope 91. It has a lateral surface 92 extending in the first seating surface direction Y1 and a vertical surface 93 extending from the first seating surface direction Y1 of the lateral surface 92 in the second vertical direction Z2.
  • a fitting portion 94 is provided on the vertical surface 93 .
  • the portion positioned on the slope 91 is positioned on the inner peripheral side slope 91a
  • the portion positioned on the horizontal surface 92 is positioned on the inner peripheral side horizontal surface 92a
  • the vertical surface 93 is positioned.
  • the part where it does is called the inner peripheral side vertical surface 93a.
  • the portion located on the slope 91 is the outer peripheral side slope 91b
  • the portion located on the horizontal surface 92 is the outer peripheral side horizontal surface 92b
  • the portion located on the vertical surface 93 is the outer peripheral side surface 91b. It will be referred to as the side vertical surface 93b.
  • the slope 91 is inclined so as to be positioned in the first seating surface direction Y1 as it goes in the first vertical direction Z1. In addition, the slope 91 overlaps the central portion of the ball passage 34 when viewed from the axial direction. Therefore, as shown in FIG. 26, a C-shaped inner peripheral rolling surface 85 opening in the first vertical direction Z1 is provided on the inner peripheral slope 91a of the inner peripheral component 81E. A C-shaped outer peripheral rolling surface 86 that opens in the second vertical direction Z2 is provided on the outer peripheral slope 91b of the outer peripheral component 82E. Therefore, groove surfaces (the inner peripheral rolling surface 85 and the outer peripheral rolling surface 86) are provided on each of the inner peripheral dividing surface 83E and the outer peripheral dividing surface 84E. Therefore, the ball 103 rolls in the ball passage 34 more smoothly than in the first embodiment.
  • the lateral surface is 92 and parallel to the seat surface 10.
  • the longitudinal plane 93 is parallel to the vertical direction.
  • the fitting portion 94 has a ridge 95 and a groove portion 96 .
  • the ridge 95 protrudes in the first seating surface direction Y1 from the inner circumferential vertical surface 93a.
  • the groove portion 96 is recessed in the first seating surface direction Y1 from the outer peripheral vertical surface 93b.
  • the ridges 95 and grooves 96 each extend in the axial direction.
  • the ridge 95 is axially inserted and fitted into the groove 96 .
  • the inner peripheral side component 81E of Embodiment 6 has the tongue 35 and the inner peripheral side rolling surface 85 .
  • the outer peripheral part 82 ⁇ /b>E has an outer peripheral rolling surface 86 and two arms 50 .
  • the middle deflector 30E of Embodiment 6 it has a crimping portion (not shown in FIGS. 25 and 26) as in Embodiment 1, and is not displaced in the first vertical direction Z1. Also, if the inner peripheral part 81E and the outer peripheral part 82E are disconnected, the outer peripheral part 82E has two arms 50 and does not shift in the vertical direction. On the other hand, the inner peripheral side component 81E does not have the arm portion 50, but the ridge 95 is caught in the groove portion 96, so that the inner peripheral side component 81E is not displaced in the second vertical direction Z2. In other words, it is possible to prevent the inner peripheral part 81E from falling off into the through hole 17 . Also, the tongue 35 is integrally provided on the inner peripheral side part 81E without being divided. Therefore, the strength of the tongue 35 is maintained, and the ball 103 can be scooped up smoothly.
  • FIG. 27 is a side view of the middle deflector of Embodiment 7 as seen from the first axis direction.
  • the middle deflector 30F of Embodiment 7 differs from the middle deflectors 30 of other embodiments in that there is no dividing surface 80 . That is, the middle deflector 30F is integrally formed as a whole.
  • Such a middle deflector 30F can be manufactured by a 3D printer. Further, even in the case of the middle deflector 30F, positional deviation in the first vertical direction Z1 is restricted by a crimping portion (not shown in FIG. 27) as in the other embodiments.
  • the present disclosure extends in a direction orthogonal to the axis O (see FIG. 4) when the middle deflector 30 and the first accommodation portion 5 (seat surface 10) are viewed from the outer peripheral side. It is not limited to what exists.
  • the middle deflector 30 and the first accommodation portion 5 (seat surface 10 ) may extend in a direction parallel to the track 106 . That is, it may be inclined in a direction other than the direction orthogonal to the axis O when viewed from the outer peripheral side, and is not particularly limited.
  • the through hole 17 may be inclined in the same direction as the seat surface 10 .
  • the crimping portions 70 are provided on both sides of the arm portion 50 in the axial direction.
  • the caulking portion 70 may be provided only in one direction.
  • both the first arm portion 51 and the second arm portion 52 are provided with the crimping portion 70, but only one of the first arm portion 51 and the second arm portion 52 is crimped.
  • a portion 70 may be provided.
  • the outer peripheral surface 32a of the middle deflector 30 in the embodiment is arcuate, the present disclosure does not require the outer peripheral surface 32a of the middle deflector 30 to be arcuate. Further, according to the present disclosure, the distance from the axis O to the outer peripheral surface 32 a of the middle deflector 30 may be smaller than the outer diameter of the nut body 1 .
  • the extended seat surface 13 of the embodiment has a first extended seat surface 14 and a second extended seat surface 15, the present disclosure consists of the first extended seat surface 14 or the second extended seat surface 15. It may be the extended seat surface 13 .

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transmission Devices (AREA)
PCT/JP2022/044869 2022-01-27 2022-12-06 ナット及びボールねじ装置 Ceased WO2023145262A1 (ja)

Priority Applications (4)

Application Number Priority Date Filing Date Title
CN202280028879.3A CN117157476A (zh) 2022-01-27 2022-12-06 螺母和滚珠丝杠装置
JP2023540535A JP7428299B2 (ja) 2022-01-27 2022-12-06 ナット及びボールねじ装置
US18/288,726 US12196292B2 (en) 2022-01-27 2022-12-06 Nut and ball screw device
EP22924114.6A EP4317747A4 (en) 2022-01-27 2022-12-06 NUT AND BALL SCREW DEVICE

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2022010601 2022-01-27
JP2022-010601 2022-01-27

Publications (1)

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WO2023145262A1 true WO2023145262A1 (ja) 2023-08-03

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US (1) US12196292B2 (https=)
EP (1) EP4317747A4 (https=)
JP (1) JP7428299B2 (https=)
CN (1) CN117157476A (https=)
WO (1) WO2023145262A1 (https=)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0211463B2 (https=) 1985-09-30 1990-03-14 Koito Mfg Co Ltd
JP2015025544A (ja) * 2013-07-29 2015-02-05 株式会社ジェイテクト ボールねじ装置
JP2018084305A (ja) * 2016-11-25 2018-05-31 株式会社ジェイテクト ボールねじ装置、及びボールねじ装置を備えたステアリング装置
JP2021188687A (ja) * 2020-05-29 2021-12-13 日本精工株式会社 ボールねじ装置

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5861292B2 (ja) 2011-05-18 2016-02-16 日本精工株式会社 ボールねじ用シール部材及びボールねじ
JP6511463B2 (ja) 2014-10-01 2019-05-15 黒田精工株式会社 ボールねじ機構のデフレクタ及びボールねじ機構
JP2018119583A (ja) 2017-01-24 2018-08-02 株式会社ジェイテクト ベルト伝動装置及びステアリング装置
JP6915004B2 (ja) 2019-08-27 2021-08-04 日本ピストンリング株式会社 ボール循環部品
JP7311074B1 (ja) * 2022-01-27 2023-07-19 日本精工株式会社 ナット及びボールねじ装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0211463B2 (https=) 1985-09-30 1990-03-14 Koito Mfg Co Ltd
JP2015025544A (ja) * 2013-07-29 2015-02-05 株式会社ジェイテクト ボールねじ装置
JP2018084305A (ja) * 2016-11-25 2018-05-31 株式会社ジェイテクト ボールねじ装置、及びボールねじ装置を備えたステアリング装置
JP2021188687A (ja) * 2020-05-29 2021-12-13 日本精工株式会社 ボールねじ装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP4317747A4

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JP7428299B2 (ja) 2024-02-06
CN117157476A (zh) 2023-12-01
US12196292B2 (en) 2025-01-14
US20240209927A1 (en) 2024-06-27
EP4317747A4 (en) 2025-01-15
JPWO2023145262A1 (https=) 2023-08-03
EP4317747A1 (en) 2024-02-07

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