WO2016114022A1 - パワーステアリング装置 - Google Patents
パワーステアリング装置 Download PDFInfo
- Publication number
- WO2016114022A1 WO2016114022A1 PCT/JP2015/083389 JP2015083389W WO2016114022A1 WO 2016114022 A1 WO2016114022 A1 WO 2016114022A1 JP 2015083389 W JP2015083389 W JP 2015083389W WO 2016114022 A1 WO2016114022 A1 WO 2016114022A1
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- WO
- WIPO (PCT)
- Prior art keywords
- opening
- insertion portion
- ball
- power steering
- nut
- Prior art date
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Classifications
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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
- 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
- F16H25/2223—Cross over deflectors between adjacent thread turns, e.g. S-form deflectors connecting neighbouring threads
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/02—Die forging; Trimming by making use of special dies ; Punching during forging
- B21J5/025—Closed die forging
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
- B62D5/0421—Electric motor acting on or near steering gear
- B62D5/0424—Electric motor acting on or near steering gear the axes of motor and final driven element of steering gear, e.g. rack, being parallel
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
- B62D5/0442—Conversion of rotational into longitudinal movement
- B62D5/0445—Screw drives
- B62D5/0448—Ball nuts
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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
- F16H25/22—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
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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
- F16H2025/2062—Arrangements for driving the actuator
- F16H2025/2081—Parallel arrangement of drive motor to screw axis
-
- 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
- F16H2025/2062—Arrangements for driving the actuator
- F16H2025/2096—Arrangements for driving the actuator using endless flexible members
Definitions
- the present invention relates to a rack assist type power steering device that is applied to, for example, an automobile and assists the movement of a rack shaft by the rotational force of a motor transmitted via a ball screw.
- Patent Document 1 As a conventional rack assist type power steering device, for example, one described in Patent Document 1 below is known.
- this ball screw is configured by interposing a plurality of balls as rolling elements that circulate through a tube between a pair of ball screw grooves formed opposite to the inner and outer peripheral portions of the screw shaft and the nut, Smooth movement of the ball between the tube and the ball screw groove by processing the connecting portion between the ball inlet / outlet hole provided in the nut and the ball screw groove (nut-side ball screw groove) into a tapered diameter. Is secured.
- the ball screw groove is formed with a lead angle, while the tube is formed along the circumferential direction of the rotating shaft of the nut.
- the present invention has been devised in view of such technical problems, and provides a power steering device that can ensure smooth movement of a ball between a tube and a ball screw groove, and a method of manufacturing the same. is there.
- the present invention connects a first connection passage formed in a nut to one end side of the ball circulation groove and a second connection passage formed in the other end side of the ball circulation groove.
- a first member having a first opening opening on one side in a circumferential direction centering on the rotation axis of the nut, each of which is formed by molding, and a connection member for circulation of the ball between the connection passages;
- a second member having a second opening that opens on the other side in the circumferential direction facing the first opening, and is inserted into the first connection passage in the joined state.
- the second insertion portion is respectively connected to the connection portion with respect to the baud. It is characterized in that it is formed to be inclined along the lead angle of the circular groove.
- each insertion portion of the connection member is configured to be along the lead angle of the ball circulation groove, it is possible to smoothly enter and exit the ball between the connection member and the ball circulation groove.
- the connecting member is divided in the circumferential direction and formed by molding, the connecting member can be easily formed, which is also used for improving productivity and reducing manufacturing costs.
- FIG. 1 is a schematic diagram of a power steering apparatus according to the present invention. It is an expanded sectional view of the motor unit vicinity shown in FIG.
- FIG. 3 is a plan view of the ball screw of FIG. 2.
- FIG. 4 is a sectional view taken along line AA in FIG. 3.
- FIG. 4 is a sectional view taken along line BB in FIG. 3.
- FIG. 4 is a sectional view taken along the line CC of FIG. 3.
- It is a top view of the tube shown in FIG. It is a side view of the tube shown in FIG. It is a bottom view of the tube shown in FIG.
- It is a disassembled perspective view of the tube shown in FIG. It is the perspective view showing the 1st insertion part vicinity of the tube shown in FIG.
- FIG. 6 is a sectional view taken along line DD of FIG. It is a figure which concerns on the manufacturing process of a tube, Comprising: (a) is the figure before 1st shaping
- the power steering device is applied to an automobile steering device.
- the power steering device has an input shaft 2 whose one end is linked to the steering wheel 1 so as to be integrally rotatable, and the other end of the input shaft 2 via a torsion bar (not shown).
- the other end side is connected to the steered wheels 5L and 5R via the rack and pinion mechanism 4, and the other end side is arranged on the outer peripheral side of the input shaft 2.
- a torque sensor 6 for detecting a steering torque based on the relative rotational displacement of the output shaft 3 and a steering assist torque corresponding to the driver's steering torque based on detection results of the torque sensor 6 and a vehicle speed sensor (not shown) will be described later.
- Motor unit 30 to be applied to the rack shaft 7 and transmission transmitted by converting the output (rotational force) of the motor unit 30 into an axial movement force of the rack shaft 7 described later while decelerating.
- a mechanism 20, and is mainly comprised.
- the rack and pinion mechanism 4 is a rack shaft 7 which is a steered shaft that is arranged so as to be substantially orthogonal to one end of the output shaft 3 and a pinion tooth (not shown) formed on the outer periphery of one end of the output shaft 3.
- the rack shaft 7 is moved in the axial direction according to the rotational direction of the output shaft 3.
- the ends of the rack shaft 7 are linked to the steered wheels 5R and 5L via tie rods 8 and 8 and knuckle arms 9 and 9, respectively.
- the rack shaft 7 moves in the axial direction and the tie rods 8 and 8 are connected to each other.
- the directions of the steered wheels 5R and 5L are changed by pulling the knuckle arms 9 and 9 via.
- the rack shaft 7 integrally includes a first gear housing 11 that is used to accommodate the rack and pinion mechanism 4 and a second gear housing 12 that is used to accommodate the transmission mechanism 20.
- the gear housing 10 is configured so as to be movable in the axial direction.
- the first housing 11 and the second housing 12 are fitted with a convex portion 12 a protruding from the joint end of the second housing 12 into a concave portion 11 a drilled in the joint end of the first gear housing 11.
- a plurality of (three in this embodiment) bolts 13 for fastening the gear housing 10 and the motor unit 30 are fastened together with the motor unit 30.
- the transmission mechanism 20 is provided on the outer periphery of the distal end portion of an output shaft 31a of an electric motor 31, which will be described later, so as to be integrally rotatable, and an input-side pulley 21 that rotates about an axis L1 of the output shaft 31a.
- An output pulley 22 that is provided on the outer periphery of the rack shaft 7 so as to be relatively rotatable, and rotates about the axis L2 of the rack shaft 7 based on the rotational force of the input pulley 21, and the output pulley 22 and the rack Winding between the ball screw 40 that is interposed between the shafts 7 and converts the axial movement of the rack shaft 7 while decelerating the rotation of the output pulley 22, and the input pulley 21 and the output pulley 22.
- a belt 23 for transmitting the rotation of the input-side pulley 21 to the output-side pulley 22 to provide synchronous rotation of the pulleys 21 and 22, and the contact between the gear housings 11 and 12. Is housed disposed on the field made the transmission mechanism housing portion 14 between the ends.
- the ball screw 40 is formed in a cylindrical shape surrounding the rack shaft 7 as shown in FIGS. 2 to 4, and a nut 41 provided so as to be rotatable relative to the rack shaft 7;
- a ball circulation groove 42 having a predetermined lead angle constituted by a spiral shaft side ball screw groove 42a provided on the outer periphery and a spiral nut side ball screw groove 42b provided on the inner periphery of the nut 41;
- a plurality of balls 43 interposed so as to be able to roll in the ball circulation groove 42 and a cylindrical shape for connecting the both ends of the ball circulation groove 42 to circulate the balls 43 between both ends of the ball circulation groove 42.
- a tube 44 which is a connecting member.
- the nut 41 is rotatably supported at one end in the axial direction by the first gear housing 11 via a ball bearing 24, and the output pulley 22 is fitted and fixed to the outer peripheral surface of the other end.
- the ball bearing 24 includes an inner ring 24a integrally formed with the nut 41, an outer ring 24b press-fitted into the inner peripheral surface of the first gear housing 11 and fastened by a lock nut 25, the inner and outer rings 24a, And a plurality of balls 24c interposed between 24b so as to roll freely. And between the both ball screw grooves 42a and 42b and the inner and outer rings 24a and 24b, a predetermined grease for lubricating friction accompanying the rolling of the balls 43 and 24c is applied, respectively.
- the nut 41 is connected to one end of the tube 44 at one end in the axial direction to supply or discharge the ball 43 to or from the ball circulation groove 42.
- 50 is formed so as to open at one end of the ball circulation groove 42 (nut-side ball screw groove 42b).
- the other end of the tube 44 is connected to the other axial end, and the second connection passage 60 for discharging or supplying the ball 43 from the ball circulation groove 42 is connected to the ball circulation groove 42 (nut-side ball A threaded groove 42b) is formed so as to open at the other end.
- the first and second connection passages 50, 60 are each formed with an opening on the outer peripheral surface of the nut 41 on one end side, and are provided with a first large diameter portion 51 and a second large diameter portion 61 that serve to connect the tube 44, A first small-diameter portion 52 that is formed in a step-reduced diameter shape from the first and second large-diameter portions 51 and 61 toward the other end side and opens to the inner peripheral surface (nut-side ball screw groove 42b) of the nut 41. And a second small diameter portion 62, and a first step portion 53 is provided between the first large diameter portion 51 and the first small diameter portion 52, and the second large diameter portion 61 and the second small diameter portion 52. A second stepped portion 63 is formed between 62.
- the input on the nut 41 side does not act, and the input on the nut 41 side cannot be transmitted to the rack shaft 7. It is a load region NL.
- the ball circulation groove 42 has an intermediate portion set to a constant inner diameter substantially the same as the diameter of the ball 43, and can sufficiently transmit the input from the nut 41 side to the rack shaft 7 side via the ball 43.
- the first predetermined range and the second predetermined range which are the predetermined ranges on both ends, are configured as the load region ML, and are transition regions between the no-load region NL and the load region ML.
- the first and second load transition regions VL1 and VL2 can change (increase or decrease) the input load transmitted from the side to the rack shaft 7 side.
- the first and second load transition regions VL1 and VL2 include a shaft-side ball screw groove 42a formed in a substantially arcuate cross section having a constant depth set to be substantially the same as the radius of the ball 43, and a nut.
- a first taper portion 45 such that a radial distance RL from the axis L2 of the rack shaft 7 corresponding to the rotation shaft 41 gradually increases toward the other end side opening of the first and second connection passages 50 and 60;
- a nut-side ball screw groove 42b in which a second taper portion 46 is formed.
- the first and second taper portions 45 and 46 only have a distance to the center of curvature of the arc-shaped surface so that the shape of the arc-shaped surface which is a cross section of the nut-side ball screw groove 42b is the same. Is changed (specifically, offset outward in the radial direction), and the center distance of curvature gradually increases along the traveling direction of the ball 43, that is, along the lead angle of the ball circulation groove 42. It is going to change.
- the first and second load transition regions VL1 and VL2 are the first and second regions on the load region ML side in the first and second predetermined ranges formed by the first and second taper portions 45 and 46, respectively.
- the first load region ML1 and the second load region ML2 that are formed in the region and configured to transmit at least part of the load input from the nut 41 side to the rack shaft 7 side, and the remaining region, the nut
- the other end side opening of the first and second connection passages 50 and 60 is configured by the first no-load region NL1 and the second no-load region NL2 configured to be unable to transmit the input from the 41 side to the rack shaft 7.
- the tube 44 has a cylindrical shape that is divided into almost halves along the extending direction (advancing direction of the ball 43), and is inside the first large-diameter portion 51.
- a first insertion portion 71 inserted into the second insertion portion 72, a second insertion portion 72 inserted into the second large diameter portion 61, and a connection portion 73 connecting the first insertion portion 71 and the second insertion portion 72.
- the first insertion portion 71 and the second insertion portion 72 are formed so as to incline along the predetermined lead angle of the ball circulation groove 42 with respect to the connection portion 73. .
- the tube 44 is a nut 41 formed by molding, respectively.
- a first member 81 having a first opening 81a that continuously opens over the entire region in the longitudinal direction on one side in the circumferential direction centered on the axis L2 of the rack shaft 7 corresponding to the rotation shaft of the first shaft 81;
- a second member 82 having a second opening 82a that opens across the entire length in the other side of the circumferential direction facing the opening 81a, and the first and second openings 81a, 82a are connected to each other. It is configured in a substantially cylindrical shape by abutting and joining.
- the tube 44 has the predetermined lead angle along the circumferential direction corresponding to the traveling direction of the ball 43 because the first and second insertion portions 71 and 72 have the predetermined lead angle.
- the first and second members 81 and 82 are such that the joint surface CS of both 81 and 82 is inclined in the inclination direction of the first and second insertion portions 44a and 44b with respect to the traveling direction of the ball 43 in the connection portion 44c. It is divided. Specifically, the first imaginary surface including the bonding surface (hereinafter referred to as “first bonding surface”) 81b in the first insertion portion 44a and the bonding surface (hereinafter referred to as “second bonding surface”) in the second insertion portion 44b. It is divided so that the first member 81 and the second member 82 have the same shape with a single joint surface CS such that the second virtual surface including 82b is in the same plane. .
- the tube 44 has a narrow angle ⁇ x formed by the first imaginary surface including the first bonding surface 81b and the second imaginary surface including the second bonding surface 82b as shown in FIG.
- the 1st member 81 is the predetermined range of the advancing direction of the ball
- a first undercut suppressing portion 83 is provided for suppressing undercutting during mold forming.
- the second member 82 is also provided with a second undercut suppressing portion 84 similar to the first undercut suppressing portion 83.
- the first and second undercut suppressing portions 83 and 84 are formed along with the molding (press molding) of the first and second members 81 and 82, and are shown in FIG.
- the first flat portion 83a and the second flat portion 84a formed so as to have a substantially straight cross section at the inner ends of the first and second openings 81a and 82a
- the first and second A first tapered portion 83b formed so as to be substantially arc-shaped in cross section in a form continuous with the inner edge of the first and second openings 81a and 82a, which are the leading edges of the two flat portions 83a and 84a;
- a second tapered portion 84b A second tapered portion 84b.
- the first and second undercut suppressing portions 83 and 84 have the inner ends of the first and second openings 81a and 82a flat as described above.
- the mating members (first and second members 81 and 82) facing the first and second undercut suppressing portions 83 and 84 are the first and second undercut suppressing portions 83, respectively. , 84 are formed so that the shape of the inner peripheral surface in the region facing the inner periphery of the tube 44 is along a virtual circle VC along the inner peripheral edge of the tube 44.
- the first and second insertion portions 71 and 72 have first, second and second insertion portions 71 and 72 within a predetermined range in the circumferential direction (around the moving direction of the ball 43) on the shaft-side ball screw groove 42a side.
- the first guide portion 71a which is the first piece for guiding the movement of the ball 43 between the second small diameter portions 52, 62 and the ball circulation groove 42
- the second guide portion 72a which is the second piece, are arranged on the shaft side.
- the first and second step portions are provided in the remaining circumferential range that is spaced from the first and second guide portions 71 a and 72 a and extends toward the ball screw groove 42 a side.
- the first contact portion 71b and the second contact portion 72b that are in contact with 53 and 63 and restrict the insertion positions of the first and second insertion portions 71 and 72 are formed to be substantially flat.
- the first and second contact portions 71b and 72b are provided so as to straddle the first and second members 81 and 82, respectively, and the first member 81 has a first step portion 53 on one end side. In contact with the second stepped portion 63 on the other end side, and the second member 82 contacts the first stepped portion 53 on the one end side and contacts the second stepped portion 63 on the other end side. It comes to touch.
- the first and second guide portions 71 a and 72 a are virtual lines that connect a pair of contact portions 74 and 74 where the shaft-side ball screw groove 42 a contacts each ball 43.
- a predetermined length (extension amount) that does not reach the pair of contact portions 74, 74 is configured to be disposed on the side opposite to the contact portion (the first and second connection passages 52, 62) from VL. Is set to Thereby, scraping off the grease by the first and second guide portions 71a and 72a in the pair of contact portions 74 and 74 can be suppressed, and good lubrication of the ball 43 can be ensured.
- the first guide portion 71a is provided only on the first member 81 side
- the second guide portion 72a is provided only on the second member 82 side.
- the motor unit 30 is supported and fixed to the second gear housing 12 at one end in the axial direction from which the output shaft 31 a protrudes, and the input side pulley 21 is driven to rotate via the transmission mechanism 20.
- An electric motor 31 for generating a steering assist force on the rack shaft 7, and an electronic controller attached to the other end of the electric motor 31 for driving and controlling the electric motor 31 in accordance with predetermined parameters such as steering torque and vehicle speed 32 are integrally formed.
- a first molding composed of a substantially plate-shaped material 70 made of a metal material is constituted by a male die 91 having a convex portion 91a and a female die 92 having a concave portion 92a. Set to mold D1.
- the set material 70 is provided with first and second openings 81a with flat portions 91b and 92b respectively formed on both sides of the convex portion 91a and the concave portion 92a.
- 82a both end portions 70a, 70a in the width direction of the material 70 corresponding to both end edges of the material 70 are held so as to face radially outward with respect to the center of the virtual circle VC along the inner peripheral edge of the tube 44.
- the concave portion 92a, the width direction intermediate portion 70b of the material 70 is bent outwardly in a convex arc shape (first molding).
- the first and second tapered portions 83b and 84b are formed, and along with the extension,
- the first and second flat portions 83a and 84a are formed by being sandwiched between the flat side surfaces 91c and 92c (see FIG. 16A) provided in the convex portion 91a and the concave portion 92a.
- the first insertion portion 71 and the second insertion portion 72 of the tube 44 are respectively connected to the connection portion 73 in the ball circulation groove 42.
- the ball 43 can be smoothly moved in and out between the tube 44 and the ball circulation groove 42.
- the tube 44 is divided in the circumferential direction, and the divided first and second members 81 and 82 are formed by molding, so that the tube 44 can be easily formed. And can be used for improving the productivity of the apparatus and reducing the manufacturing cost.
- the first and second insertion portions 71 and 72 are formed in the first member 81 with the first opening 81 a formed in the entire region of the moving direction of the ball 43, and the second member 82.
- the mold is formed in the entire region of the first and second members 81, 82.
- the first member 81 and the second member 82 are flush with the first virtual surface including the first connection surface 81b and the second virtual surface including the second connection surface 82b. Since the first and second members 81 and 82 are divided with a single joint surface, the moldability when molding these members 81 and 82 is improved, and the device It is used for further improving productivity and lowering manufacturing costs.
- the first member 81 and the second member 82 are configured to have the same shape in accordance with the division of the tube 44, so that the molding dies of both the members 81 and 82 are made common. Therefore, the manufacturing cost of the apparatus can be further reduced.
- the narrow angle ⁇ x formed by the first virtual surface including the first joint surface 81 b and the second virtual surface including the second joint surface 82 b is the first and second insertions into the connection portion 73. Since it is configured to be smaller than the sum of the inclination angles ⁇ 1 and ⁇ 2 of the portions 71 and 72, the divided surfaces of the first and second insertion portions 71 and 72 (joining of the first and second openings 81a and 82a) As compared with a configuration in which the surface is divided into two equal parts, the unevenness of the divided surface can be reduced, and as a result, the moldability of the first and second members 81 and 82 during molding can be improved. it can.
- each of the first and second members 81 and 82 has a predetermined length in the traveling direction of the ball 43 and the circumferential length of the inner peripheral edge in a cross section orthogonal to the traveling direction is the counterpart member 82 or 81.
- the inner peripheral edge on the first and second opening portions 81a, 82a side of the predetermined region that is larger than the circumferential length of each of the inner peripheral edges is more radially outward than the virtual circle VC along the inner peripheral edge of the tube 44.
- the virtual circle VC along the inner peripheral edge of the tube 44 is used. Therefore, the ball 43 can be appropriately supported in the tube 44 with the inner peripheral surfaces of the mating members 82 and 81 facing the undercut suppressing portions 83 and 84, respectively. Become. Thereby, the radial displacement of the ball 43 in the tube 44 is suppressed, and the movement of the ball 43 can be further smoothed.
- the joint surface CS between the first opening 81 a and the second opening 82 a is connected to the connection portion 73 with respect to the traveling direction of the ball 43 in the connection portion 73.
- the first and second members 81 and 82 are molded with respect to the center of the virtual circle VC along the inner peripheral edge of the tube 44. Since both end portions 70a and 70a in the width direction of the material 70, which are the end portions of the first and second openings 81a and 82a, are bent and processed so as to be directed radially outward, The shape can be used as the first and second undercut suppressing portions 83 and 84, and the trouble of separately processing each of the undercut suppressing portions 83 and 84 can be omitted.
- first and second contact portions 71b and 72b capable of contacting the first and second step portions 53 and 63 are provided on both the first and second members 81 and 82, respectively.
- the first and second contact portions 71b and 72b are configured to straddle the first and second members 81 and 82, the insertion direction of both the first and second members 81 and 82 is determined. Can be positioned, and the assembly workability of the apparatus can be improved.
- the first and second guide portions 71a and 72a do not straddle the first and second members 81 and 82, the first guide portion 71a is only the first member 81, and the second guide portion 72a is the second guide portion 72a. Since the first and second guide portions 71a and 72a are not provided with the joining surfaces (divided surfaces) of the first and second members 81 and 82, the first and second guide portions 71a and 72a are provided with the first and second guide portions 71a and 72a. Further, it is possible to suppress the strength reduction of the second guide portions 71a and 72a, and to ensure good durability of the tube 44.
- the shaft-side ball screw groove 42a is on the side opposite the contact portion than the virtual line VL connecting the pair of contact portions 74 and 74 that contact the ball 43. It is configured to be arranged on the (first and second connection passages 52, 62 side), and is set to a predetermined length (extension amount) that does not reach the pair of contact portions 74, 74. It becomes possible to suppress scraping of the grease at the pair of contact portions 74, 74, and good lubrication of the ball 43 can be ensured.
- the following modes can be considered.
- the power steering device has a cylindrical shape that surrounds the steered shaft and the steered shaft that is used to steer the steered wheels by moving in the axial direction as the steering wheel rotates. And a nut provided to be rotatable relative to the steered shaft, a spiral groove-shaped shaft-side ball screw groove provided on the outer periphery of the steered shaft, and an inner periphery of the nut.
- a ball circulation groove composed of a spiral groove-like nut-side ball screw groove, a plurality of balls interposed so as to be able to roll in the ball circulation groove, and one end side being formed in an opening on the outer peripheral surface of the nut;
- the other end side is an inner peripheral surface of the nut and the first connection passage is formed at one end side of the ball circulation groove, the one end side is formed at the outer peripheral surface of the nut, and the other end side is the inner peripheral surface of the nut.
- connection passage formed in the other end of the circulation groove, a connection member connecting the first connection passage and the second connection passage to provide circulation of the balls between the two connection passages, and the nut
- An electric motor that applies a steering force to the steered shaft by rotational driving, and each of the connection members is formed by molding on one side in the circumferential direction around the rotation shaft of the nut.
- a first member having a first opening to be opened, and a second member having a second opening to be opened on the other side in the circumferential direction facing the first opening; and In the joined state, the first insertion portion inserted into the first connection passage, the second insertion portion inserted into the second connection passage, and the first insertion portion and the second insertion portion are connected.
- a connecting portion, and the first insertion portion and the connection portion 2 the insertion portion is formed to be inclined along the lead angle of the ball circulation groove with respect to each of the connecting portions.
- the first member and the second member have the same shape.
- the first connection passage has a first step portion with which one end face of the connection member abuts
- the second connection passage is The second member has a second step portion with which the other end surface of the connecting member contacts, and the first member contacts the first step portion on one end side and contacts the second step portion on the other end side.
- the second member is in contact with the first step portion on one end side and is in contact with the second step portion on the other end side.
- the shaft-side ball screw groove has a pair of contact portions that contact a ball, and the first piece portion and the second piece portion are The first contact portion is disposed on the side opposite the contact portion with respect to the virtual line connecting the pair of contact portions.
- the first member has a predetermined length in the traveling direction of the ball and a circumferential length of an inner peripheral edge in a cross section orthogonal to the traveling direction. Is larger than the circumferential length of the second member, the inner peripheral edge of the first opening side is expanded radially outward from the virtual circle along the inner peripheral edge of the connection member.
- a first undercut suppressing portion for suppressing undercut at the time of molding wherein the second member is a predetermined range in the moving direction of the ball and is a circumferential direction of an inner peripheral edge in a cross section orthogonal to the moving direction In the region where the length is larger than the circumferential length of the first member, the inner peripheral edge on the second opening side is expanded radially outward from the virtual circle along the inner peripheral edge of the connecting member.
- a second undercut suppressing portion subjected to the suppression of undercut during molding.
- the first member and the second member are joint surfaces of the first opening and the second opening in the first insertion portion.
- a narrow angle formed between a first virtual surface including the second virtual surface including a joint surface between the first opening and the second opening in the second insertion portion is the first insertion with respect to the connection portion. It is smaller than the sum of the inclination angle of the part and the inclination angle of the second insertion part with respect to the connection part.
- the first member has an inner peripheral surface in a region facing the second undercut suppressing portion along the inner peripheral edge of the connection member.
- the second member is formed so that the shape of the inner peripheral surface of the region facing the first undercut suppressing portion is along the virtual circle along the inner peripheral edge of the connection member. Has been.
- the first member and the second member are formed by press-molding a plate-shaped material made of a metal material, and the first member Is bent with respect to the center of an imaginary circle along the inner peripheral edge of the connecting member so that the end of the first opening faces radially outward, and the second member is formed of the connecting member. With respect to the center of the virtual circle along the inner peripheral edge, the second opening is bent so that the end of the second opening is directed radially outward.
- the first member and the second member are joint surfaces of the first opening and the second opening in the first insertion portion.
- the first virtual surface including the second virtual surface including the joint surface between the first opening and the second opening in the second insertion portion is formed to be on the same plane.
- the first insertion portion and the second insertion portion are configured such that the first opening portion is disposed in the entire region of the first member in the moving direction of the ball.
- the second member is formed to be inclined with respect to the connection member in a range in which the second opening is formed in the entire area of the second member in the moving direction of the ball.
- the first member and the second member have a connection surface between the first opening and the second opening.
- the first insertion portion and the second insertion portion are inclined with respect to the traveling direction of the ball in the portion.
- the first connection passage has a first step portion with which one end face of the connection member abuts, and the second connection passage is And a second stepped portion with which the other end surface of the connecting member abuts, and the connecting member is disposed within a predetermined range on the shaft-side ball screw groove side around the moving direction of the ball in the first insertion portion.
- a first piece that is provided and extends toward the shaft-side ball screw groove; and a first contact portion that is provided apart from the first piece and contacts the first step portion.
- a second piece portion provided in a predetermined range on the shaft-side ball screw groove side around the moving direction of the ball in the second insertion portion and extending toward the shaft-side ball screw groove side, A second portion that is spaced apart from the two pieces and contacts the second stepped portion; And a contact portion, said first arm portion, said being only provided on the first member side, the second arm portion is provided only on the second member side.
- a method for manufacturing a power steering apparatus includes a turning shaft for turning a steered wheel by moving in an axial direction with rotation of a steering wheel, and a cylinder so as to surround the turning shaft.
- a nut formed to be rotatable relative to the steered shaft, a spiral groove-like shaft-side ball screw groove provided on the outer periphery of the steered shaft, and an inner periphery of the nut.
- a ball circulation groove formed of a spiral groove-shaped nut-side ball screw groove, a plurality of balls interposed so as to be able to roll in the ball circulation groove, and one end side being formed in the outer peripheral surface of the nut.
- the other end side is an inner peripheral surface of the nut and the first connection passage is open at one end side of the ball circulation groove, the one end side is open at the outer peripheral surface of the nut, and the other end side is an inner side of the nut.
- the circumferential surface of the ball circulation groove A second connection passage having an opening formed on the other end side, a first insertion portion inserted into the first connection passage, a second insertion portion inserted into the second connection passage, and the first insertion portion;
- a power steering apparatus manufacturing method comprising: an electric motor that applies a steering force to the steered shaft by driving; and a first opening that opens on one side in a circumferential direction centering on a rotation shaft of the nut.
- the first member and the second member have the same shape.
- the first member is a predetermined range in the traveling direction of the ball and is a circumferential direction of an inner peripheral edge in a cross section orthogonal to the traveling direction.
- the inner peripheral edge on the first opening side is enlarged radially outward from the virtual circle along the inner peripheral edge of the connecting member.
- the first member has a first undercut suppressing portion for suppressing undercut during molding
- the second member has a predetermined range in the moving direction of the ball and has an inner peripheral edge in a cross section perpendicular to the moving direction.
- the first member and the second member are the first opening and the second opening in the first insertion portion.
- the narrow angle formed by the first virtual surface including the joint surface and the second virtual surface including the joint surface of the first opening and the second opening in the second insertion portion is It is smaller than the sum of the inclination angle of the first insertion portion and the inclination angle of the second insertion portion with respect to the connection portion.
- the shape of the inner peripheral surface of the region facing the second undercut suppressing portion of the first member is the inner portion of the connection member.
- the second member is formed along a virtual circle along the periphery, and the shape of the inner peripheral surface of the region facing the first undercut suppressing portion is along the virtual circle along the inner periphery of the connection member. It is formed as follows.
- the first member and the second member are the first opening and the second opening in the first insertion portion.
- the first virtual surface including the joint surface and the second virtual surface including the joint surface between the first opening and the second opening in the second insertion portion are formed to be on the same plane. Yes.
- the first insertion portion and the second insertion portion are arranged in the first member in the entire traveling direction of the ball.
- An opening is formed, and the second member is formed to be inclined with respect to the connection member in a range in which the second opening is formed in the entire region of the second member in the moving direction of the ball.
- the first member and the second member have a joint surface between the first opening and the second opening.
- the first insertion portion and the second insertion portion are inclined with respect to the traveling direction of the ball in the connection portion.
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Abstract
Description
Claims (20)
- ステアリングホイールの回転に伴って軸方向移動することで転舵輪の転舵に供する転舵軸と、
前記転舵軸を包囲するように筒状に形成され、該転舵軸に対し相対回転自在に設けられたナットと、
前記転舵軸の外周に設けられた螺旋溝状の軸側ボールねじ溝と、前記ナットの内周に設けられた螺旋溝状のナット側ボールねじ溝とから構成されるボール循環溝と、
前記ボール循環溝内において転動可能に介装された複数のボールと、
一端側が前記ナットの外周面に開口形成され、他端側が前記ナットの内周面であって前記ボール循環溝の一端側に開口形成された第1接続通路と、
一端側が前記ナットの外周面に開口形成され、他端側が前記ナットの内周面であって前記ボール循環溝の他端側に開口形成された第2接続通路と、
前記第1接続通路と前記第2接続通路とを繋いで該両接続通路間のボールの循環に供する接続部材と、
前記ナットを回転駆動することによって前記転舵軸に操舵力を付与する電動モータと、
を備え、
前記接続部材は、
それぞれ型成形により形成された、前記ナットの回転軸を中心とした周方向の一方側に開口する第1開口部を有する第1部材と、前記第1開口部と対向する前記周方向の他方側に開口する第2開口部を有する第2部材と、を接合することによって構成され、
前記接合された状態において、前記第1接続通路に挿入される第1挿入部と、前記第2接続通路に挿入される第2挿入部と、前記第1挿入部と前記第2挿入部とを接続する接続部と、を有し、
前記第1挿入部及び前記第2挿入部がそれぞれ前記接続部に対し前記ボール循環溝のリード角に沿って傾斜するように形成されたことを特徴とするパワーステアリング装置。 - 前記第1部材と前記第2部材とは、同一形状を有することを特徴とする請求項1に記載のパワーステアリング装置。
- 前記第1接続通路は、前記接続部材の一方側の端面が当接する第1段差部を有し、
前記第2接続通路は、前記接続部材の他方側の端面が当接する第2段差部を有し、
前記第1部材は、一端側において前記第1段差部と当接すると共に、他端側において前記第2段差部と当接し、
前記第2部材は、一端側において前記第1段差部と当接すると共に、他端側において前記第2段差部と当接することを特徴とする請求項2に記載のパワーステアリング装置。 - 前記第1接続通路は、前記接続部材の一方側の端面が当接する第1段差部を有し、
前記第2接続通路は、前記接続部材の他方側の端面が当接する第2段差部を有し、
前記接続部材は、
前記第1挿入部における前記ボールの移動方向周りに、前記軸側ボールねじ溝側の所定範囲に設けられて該軸側ボールねじ溝側へと延出する第1片部と、該第1片部とは離間して設けられて前記第1段差部と当接する第1当接部とを有すると共に、
前記第2挿入部における前記ボールの移動方向周りに、前記軸側ボールねじ溝側の所定範囲に設けられて該軸側ボールねじ溝側へと延出する第2片部と、該第2片部とは離間して設けられて前記第2段差部と当接する第2当接部とを有し、
前記第1片部は、前記第1部材側にのみ設けられ、
前記第2片部は、前記第2部材側にのみ設けられることを特徴とする請求項2に記載のパワーステアリング装置。 - 前記軸側ボールねじ溝は、ボールと接触する1対の接触部を有し、
前記第1片部及び第2片部は、前記1対の接触部同士を結んだ仮想線よりも反接触部側に配置されることを特徴とする請求項2に記載のパワーステアリング装置。 - 前記第1部材は、前記ボールの進行方向の所定範囲であって該進行方向に直交する断面における内周縁の周方向長さが前記第2部材の該周方向長さよりも大きくなる領域に、前記第1開口部側の内周縁が前記接続部材の内周縁に沿う仮想円よりも径方向外側へと拡大されることで前記型成形時におけるアンダーカットの抑制に供する第1アンダーカット抑制部を有し、
前記第2部材は、前記ボールの進行方向の所定範囲であって該進行方向に直交する断面における内周縁の周方向長さが前記第1部材の該周方向長さよりも大きくなる領域に、前記第2開口部側の内周縁が前記接続部材の内周縁に沿う仮想円よりも径方向外側へと拡大されることで前記型成形時におけるアンダーカットの抑制に供する第2アンダーカット抑制部を有することを特徴とする請求項1に記載のパワーステアリング装置。 - 前記第1部材及び前記第2部材は、前記第1挿入部における前記第1開口部と前記第2開口部との接合面を含む第1仮想面と、前記第2挿入部における前記第1開口部と前記第2開口部との接合面を含む第2仮想面との成す狭角が、前記接続部に対する前記第1挿入部の傾斜角と前記接続部に対する前記第2挿入部の傾斜角との和よりも小さくなることを特徴とする請求項6に記載のパワーステアリング装置。
- 前記第1部材は、前記第2アンダーカット抑制部と対向する領域の内周面の形状が前記接続部材の内周縁に沿った仮想円に沿うように形成され、
前記第2部材は、前記第1アンダーカット抑制部と対向する領域の内周面の形状が前記接続部材の内周縁に沿った仮想円に沿うように形成されたことを特徴とする請求項6に記載のパワーステアリング装置。 - 前記第1部材及び前記第2部材は、金属材料からなる板状の素材をプレス成型することによって形成され、
前記第1部材は、前記接続部材の内周縁に沿った仮想円の中心に対し、前記第1開口部の端部が径方向外側へ向くように屈曲して形成され、
前記第2部材は、前記接続部材の内周縁に沿った仮想円の中心に対し、前記第2開口部の端部が径方向外側へ向くように屈曲して形成されたことを特徴とする請求項6に記載のパワーステアリング装置。 - 前記第1部材及び前記第2部材は、前記第1挿入部における前記第1開口部と前記第2開口部との接合面を含む第1仮想面と、前記第2挿入部における前記第1開口部と前記第2開口部との接合面を含む第2仮想面と、が同一平面となるように形成されたことを特徴とする請求項1に記載のパワーステアリング装置。
- 前記第1挿入部及び前記第2挿入部は、前記第1部材における前記ボールの進行方向の全域に前記第1開口部が形成され、かつ前記第2部材における前記ボールの進行方向の全域に前記第2開口部が形成された範囲で、前記接続部材に対して傾斜状に形成されたことを特徴とする請求項10に記載のパワーステアリング装置。
- 前記第1部材及び前記第2部材は、前記第1開口部と前記第2開口部との間の接合面が、前記接続部における前記ボールの進行方向に対し、前記接続部に対する前記第1挿入部及び前記第2挿入部の傾斜方向に傾斜して形成されたことを特徴とする請求項10に記載のパワーステアリング装置。
- ステアリングホイールの回転に伴って軸方向移動することで転舵輪の転舵に供する転舵軸と、
前記転舵軸を包囲するように筒状に形成され、該転舵軸に対し相対回転自在に設けられたナットと、
前記転舵軸の外周に設けられた螺旋溝状の軸側ボールねじ溝と、前記ナットの内周に設けられた螺旋溝状のナット側ボールねじ溝とから構成されるボール循環溝と、
前記ボール循環溝内において転動可能に介装された複数のボールと、
一端側が前記ナットの外周面に開口形成され、他端側が前記ナットの内周面であって前記ボール循環溝の一端側に開口形成された第1接続通路と、
一端側が前記ナットの外周面に開口形成され、他端側が前記ナットの内周面であって前記ボール循環溝の他端側に開口形成された第2接続通路と、
前記第1接続通路に挿入される第1挿入部と、前記第2接続通路に挿入される第2挿入部と、前記第1挿入部と前記第2挿入部とを接続する接続部とを有し、前記第1接続通路と前記第2接続通路とを繋いで該両接続通路間のボールの循環に供する接続部材と、
前記ナットを回転駆動することによって前記転舵軸に操舵力を付与する電動モータと、
を備えたパワーステアリング装置の製造方法であって、
前記ナットの回転軸を中心とした周方向の一方側に開口する第1開口部を有する第1部材と、前記第1開口部と対向する前記周方向の他方側に開口する第2開口部を有する第2部材とを、前記第1挿入部及び前記第2挿入部がそれぞれ前記接続部に対して前記ボール循環溝のリード角に沿って傾斜するように型成形し、該両部材を接合することによって前記接続部材を形成することを特徴とするパワーステアリング装置の製造方法。 - 前記第1部材と前記第2部材とは、同一形状を有することを特徴とする請求項13に記載のパワーステアリング装置の製造方法。
- 前記第1部材は、前記ボールの進行方向の所定範囲であって該進行方向に直交する断面における内周縁の周方向長さが前記第2部材の該周方向長さよりも大きくなる領域に、前記第1開口部側の内周縁が前記接続部材の内周縁に沿う仮想円よりも径方向外側へと拡大されることで前記型成形時におけるアンダーカットの抑制に供する第1アンダーカット抑制部を有し、
前記第2部材は、前記ボールの進行方向の所定範囲であって該進行方向に直交する断面における内周縁の周方向長さが前記第1部材の該周方向長さよりも大きくなる領域に、前記第2開口部側の内周縁が前記接続部材の内周縁に沿う仮想円よりも径方向外側へと拡大されることで前記型成形時におけるアンダーカットの抑制に供する第2アンダーカット抑制部を有することを特徴とする請求項13に記載のパワーステアリング装置の製造方法。 - 前記第1部材及び前記第2部材は、前記第1挿入部における前記第1開口部と前記第2開口部との接合面を含む第1仮想面と、前記第2挿入部における前記第1開口部と前記第2開口部との接合面を含む第2仮想面との成す狭角が、前記接続部に対する前記第1挿入部の傾斜角と前記接続部に対する前記第2挿入部の傾斜角との和よりも小さくなることを特徴とする請求項15に記載のパワーステアリング装置の製造方法。
- 前記第1部材は、前記第2アンダーカット抑制部と対向する領域の内周面の形状が前記接続部材の内周縁に沿った仮想円に沿うように形成され、
前記第2部材は、前記第1アンダーカット抑制部と対向する領域の内周面の形状が前記接続部材の内周縁に沿った仮想円に沿うように形成されたことを特徴とする請求項15に記載のパワーステアリング装置の製造方法。 - 前記第1部材及び前記第2部材は、前記第1挿入部における前記第1開口部と前記第2開口部との接合面を含む第1仮想面と、前記第2挿入部における前記第1開口部と前記第2開口部との接合面を含む第2仮想面と、が同一平面となるように形成されたことを特徴とする請求項13に記載のパワーステアリング装置の製造方法。
- 前記第1挿入部及び前記第2挿入部は、前記第1部材における前記ボールの進行方向の全域に前記第1開口部が形成され、かつ前記第2部材における前記ボールの進行方向の全域に前記第2開口部が形成された範囲で、前記接続部材に対して傾斜状に形成されたことを特徴とする請求項18に記載のパワーステアリング装置の製造方法。
- 前記第1部材及び前記第2部材は、前記第1開口部と前記第2開口部との間の接合面が、前記接続部における前記ボールの進行方向に対し、前記接続部に対する前記第1挿入部及び前記第2挿入部の傾斜方向に傾斜して形成されたことを特徴とする請求項18に記載のパワーステアリング装置の製造方法。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
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US15/542,312 US10309502B2 (en) | 2015-01-16 | 2015-11-27 | Power steering device |
CN201580072910.3A CN107110315B (zh) | 2015-01-16 | 2015-11-27 | 动力转向装置及其制造方法 |
JP2016569251A JP6434539B2 (ja) | 2015-01-16 | 2015-11-27 | パワーステアリング装置及びその製造方法 |
DE112015005969.5T DE112015005969T5 (de) | 2015-01-16 | 2015-11-27 | Servolenkvorrichtung |
KR1020177018308A KR20170092641A (ko) | 2015-01-16 | 2015-11-27 | 파워 스티어링 장치 |
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JP2015006382 | 2015-01-16 | ||
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JP (1) | JP6434539B2 (ja) |
KR (1) | KR20170092641A (ja) |
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CN111566386B (zh) * | 2018-01-11 | 2023-08-18 | 日立安斯泰莫株式会社 | 动力转向装置 |
US20220381282A1 (en) * | 2021-05-25 | 2022-12-01 | Brady Fox-Mudge | Self tightening nut and bolt system |
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JP2003172422A (ja) * | 2001-11-29 | 2003-06-20 | Shangyin Sci & Technol Co Ltd | ボール・スクリュー・ユニットのボール循環管路 |
JP2005076652A (ja) * | 2003-08-29 | 2005-03-24 | Nsk Ltd | ボールねじ装置 |
JP2005249046A (ja) * | 2004-03-03 | 2005-09-15 | Nsk Ltd | ボールねじ装置 |
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JPH0669502U (ja) | 1993-03-11 | 1994-09-30 | ヤマザキマザック株式会社 | チューブ式ボールねじ |
JP3726460B2 (ja) | 1997-01-29 | 2005-12-14 | 日本精工株式会社 | ボールねじ機構 |
US6244125B1 (en) | 1998-06-10 | 2001-06-12 | Koyo Seiko Co., Ltd. | Movement transforming device and power steering apparatus |
JP2001141019A (ja) | 1999-09-03 | 2001-05-25 | Nsk Ltd | ボールねじ装置 |
DE10042610B4 (de) | 1999-09-03 | 2005-01-13 | Nsk Ltd. | "Kugelumlaufspindelvorrichtung" |
US6675669B2 (en) | 2000-08-23 | 2004-01-13 | Nsk Ltd. | Ball screw apparatus |
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JP4351583B2 (ja) * | 2004-05-21 | 2009-10-28 | 株式会社日立製作所 | パワーステアリング装置 |
JP2006046530A (ja) * | 2004-08-05 | 2006-02-16 | Nsk Ltd | ボールねじ装置 |
JPWO2007026801A1 (ja) | 2005-08-31 | 2009-03-26 | Thk株式会社 | ステアリング装置及びこれに用いる運動変換装置 |
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JP6295469B2 (ja) * | 2014-02-27 | 2018-03-20 | 日立オートモティブシステムズ株式会社 | パワーステアリング装置およびパワーステアリング装置の製造方法 |
WO2016114021A1 (ja) | 2015-01-16 | 2016-07-21 | 日立オートモティブシステムズ株式会社 | パワーステアリング装置 |
JP6805752B2 (ja) * | 2016-11-25 | 2020-12-23 | 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 |
-
2015
- 2015-11-27 KR KR1020177018308A patent/KR20170092641A/ko not_active Application Discontinuation
- 2015-11-27 WO PCT/JP2015/083389 patent/WO2016114022A1/ja active Application Filing
- 2015-11-27 CN CN201580072910.3A patent/CN107110315B/zh active Active
- 2015-11-27 US US15/542,312 patent/US10309502B2/en active Active
- 2015-11-27 JP JP2016569251A patent/JP6434539B2/ja active Active
- 2015-11-27 DE DE112015005969.5T patent/DE112015005969T5/de not_active Ceased
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JP2003172422A (ja) * | 2001-11-29 | 2003-06-20 | Shangyin Sci & Technol Co Ltd | ボール・スクリュー・ユニットのボール循環管路 |
JP2005076652A (ja) * | 2003-08-29 | 2005-03-24 | Nsk Ltd | ボールねじ装置 |
JP2005249046A (ja) * | 2004-03-03 | 2005-09-15 | Nsk Ltd | ボールねじ装置 |
JP2013024318A (ja) * | 2011-07-20 | 2013-02-04 | Nsk Ltd | ボールねじ用循環部品、ボールねじ |
JP2014185724A (ja) * | 2013-03-25 | 2014-10-02 | Hitachi Automotive Systems Steering Ltd | パワーステアリング装置 |
WO2014192595A1 (ja) * | 2013-05-31 | 2014-12-04 | Thk株式会社 | ねじ装置 |
Also Published As
Publication number | Publication date |
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JP6434539B2 (ja) | 2018-12-05 |
KR20170092641A (ko) | 2017-08-11 |
CN107110315A (zh) | 2017-08-29 |
CN107110315B (zh) | 2019-06-14 |
US20180274641A1 (en) | 2018-09-27 |
US10309502B2 (en) | 2019-06-04 |
JPWO2016114022A1 (ja) | 2017-08-24 |
DE112015005969T5 (de) | 2017-10-12 |
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