WO2019176872A1 - Joint de transmission de couple et dispositif de direction assistée électrique - Google Patents

Joint de transmission de couple et dispositif de direction assistée électrique Download PDF

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Publication number
WO2019176872A1
WO2019176872A1 PCT/JP2019/009761 JP2019009761W WO2019176872A1 WO 2019176872 A1 WO2019176872 A1 WO 2019176872A1 JP 2019009761 W JP2019009761 W JP 2019009761W WO 2019176872 A1 WO2019176872 A1 WO 2019176872A1
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WO
WIPO (PCT)
Prior art keywords
transmission
teeth
transmission member
intermediate transmission
circumferential
Prior art date
Application number
PCT/JP2019/009761
Other languages
English (en)
Japanese (ja)
Inventor
瀬川　徹
亮 大澤
石井　徹
Original Assignee
日本精工株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 日本精工株式会社 filed Critical 日本精工株式会社
Priority to DE212019000215.3U priority Critical patent/DE212019000215U1/de
Priority to JP2020506519A priority patent/JP6927411B2/ja
Publication of WO2019176872A1 publication Critical patent/WO2019176872A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D3/00—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
    • F16D3/50—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive with the coupling parts connected by one or more intermediate members
    • F16D3/54—Couplings comprising a chain or strip surrounding two wheels arranged side by side and provided with teeth or the equivalent
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D3/00—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
    • F16D3/50—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive with the coupling parts connected by one or more intermediate members
    • F16D3/72—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive with the coupling parts connected by one or more intermediate members with axially-spaced attachments to the coupling parts
    • F16D3/74—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive with the coupling parts connected by one or more intermediate members with axially-spaced attachments to the coupling parts the intermediate member or members being made of rubber or other rubber-like flexible material
    • 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
    • B62D5/0409—Electric motor acting on the steering column
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D3/00—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
    • F16D3/50—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive with the coupling parts connected by one or more intermediate members
    • F16D3/64—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive with the coupling parts connected by one or more intermediate members comprising elastic elements arranged between substantially-radial walls of both coupling parts
    • F16D3/68—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive with the coupling parts connected by one or more intermediate members comprising elastic elements arranged between substantially-radial walls of both coupling parts the elements being made of rubber or similar material
    • 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
    • F16H1/00—Toothed gearings for conveying rotary motion
    • F16H1/02—Toothed gearings for conveying rotary motion without gears having orbital motion
    • F16H1/04—Toothed gearings for conveying rotary motion without gears having orbital motion involving only two intermeshing members
    • F16H1/12—Toothed gearings for conveying rotary motion without gears having orbital motion involving only two intermeshing members with non-parallel axes
    • F16H1/16—Toothed gearings for conveying rotary motion without gears having orbital motion involving only two intermeshing members with non-parallel axes comprising worm and worm-wheel
    • 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
    • F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
    • F16H55/02—Toothed members; Worms
    • F16H55/22—Toothed members; Worms for transmissions with crossing shafts, especially worms, worm-gears
    • F16H55/24—Special devices for taking up backlash

Definitions

  • the present invention relates to a torque transmission joint that is incorporated in various mechanical devices and transmits torque between a drive shaft and a driven shaft, and an electric power steering device in which the torque transmission joint is incorporated.
  • FIG. 14 and FIG. 15 show an example of a conventional electric power steering apparatus described in Japanese Patent Application Laid-Open No. 2004-306898.
  • This electric power steering apparatus includes a steering shaft 2 having a steering wheel 1 attached to the rear end, a housing 3 that rotatably supports the front end of the steering shaft 2, and a portion that is rotationally driven by the steering shaft 2.
  • a fixed worm wheel 4 and a worm 7 having a worm tooth 5 meshing with the worm wheel 4 at an axially intermediate portion and driven to rotate by an electric motor 6 are provided.
  • Both end portions of the worm 7 in the axial direction are rotatably supported in the housing 3 by a pair of rolling bearings 8 and 9 such as deep groove type ball bearings.
  • a pressing piece 10 is externally fitted at a portion protruding from the rolling bearing 8 at the tip of the worm 7, and an urging mechanism such as a coil spring 11 is disposed between the pressing piece 10 and the housing 3. .
  • the coil spring 11 urges the worm teeth 5 of the worm 7 toward the worm wheel 4 via the pressing piece 10.
  • a spline hole 13 is provided at the base end portion of the worm 7, and a spline shaft portion 14 is provided at the distal end portion of the output shaft 12 of the electric motor 6, and the spline hole 13 and the output shaft 12 of the worm 7 are provided. Torque transmission between the electric motor 6 and the worm 7 is possible by the spline engagement with the spline shaft portion 14.
  • the sum of the misalignment allowed between the one end transmission member and the intermediate transmission member and the misalignment allowed between the other end transmission member and the intermediate transmission member is the output.
  • the torque transmission joint according to the present invention includes an intermediate transmission member and a pair of end transmission members.
  • the intermediate transmission member has a plurality of intermediate transmission teeth arranged at a plurality of locations in the circumferential direction.
  • the pair of end transmission members are arranged on both sides in the axial direction of the intermediate transmission member, and each of the pair of end transmission members has a plurality of end transmission teeth arranged at a plurality of locations in the circumferential direction. .
  • the intermediate transmission member has a partition wall portion that extends in the radial direction of the intermediate transmission member and axially opposes each inner end portion in the axial direction of the pair of end portion transmission members.
  • the partition portion may be disposed at an intermediate portion in the axial direction of the intermediate transmission member.
  • the partition wall portion may have a plate shape perpendicular to the central axis of the intermediate transmission member and having a constant thickness dimension.
  • the intermediate transmission member includes a cylindrical intermediate tube portion, the intermediate transmission teeth are disposed radially inward of the intermediate tube portion, and the partition wall portion is radially inward of the intermediate tube portion.
  • the space existing on the radially inner side of the intermediate cylinder portion can be divided into two in the axial direction.
  • the partition wall portion may have a pair of projecting portions projecting toward both sides in the axial direction at a radially central portion located radially inward of the intermediate transmission teeth.
  • the partition wall portion may have a circular through hole in the radial center portion.
  • the joint for torque transmission according to the present invention additionally includes an elastic member that is assembled to the intermediate transmission member and has insertion holes through which the plurality of end transmission teeth arranged at a plurality of locations in the circumferential direction are inserted in the axial direction. Can be provided.
  • the end transmission teeth and the intermediate transmission teeth inserted in the axial direction through the insertion hole are arranged alternately in the circumferential direction and with a circumferential gap.
  • the circumferential interval between the circumferential side edges of the insertion hole is smaller than the circumferential interval between adjacent intermediate transmission teeth among the plurality of intermediate transmission teeth.
  • the electric power steering apparatus of the present invention includes a housing, a worm wheel, a worm, and an electric motor.
  • the worm wheel is rotatably supported with respect to the housing.
  • the worm is rotatably supported with respect to the housing in a state of being engaged with the worm wheel.
  • the electric motor has an output shaft for rotationally driving the worm.
  • the electric power steering apparatus includes a torque transmission joint that connects the output shaft of the electric motor and the worm so that torque transmission is possible between the output shaft of the electric motor and the worm.
  • the torque transmission joint is constituted by the torque transmission joint of the present invention.
  • One end transmission member of the pair of end transmission members is fixed or integrally formed at the tip of the output shaft of the electric motor.
  • the other end transmission member of the pair of end transmission members is fixed to or integrally formed with the base end of the worm.
  • the worm is swingable with respect to the output shaft of the electric motor, and the worm is placed on the worm wheel between the tip of the worm and the housing.
  • An urging mechanism that urges toward the camera can be provided.
  • the torque transmission joint and the electric power steering apparatus of the present invention it is possible to properly allow misalignment between the drive shaft and the driven shaft, and to perform intermediate transmission located in the middle with respect to the torque transmission direction. It becomes possible to regulate the axial position of the member.
  • FIG. 1 is a partially cutaway side view showing an electric power steering apparatus of a first example of an embodiment.
  • FIG. 2 is an enlarged view of part A of FIG.
  • FIG. 3 is a view of the torque transmission joint of the first example of the embodiment as viewed from the side in the axial direction.
  • FIG. 4 is a view corresponding to the BB cross-sectional view of FIG. 3, showing the torque transmission joint of the first example of the embodiment assembled in the electric power steering apparatus.
  • FIG. 5 is a view corresponding to the cross-sectional view taken along the line CC in FIG. 3, showing the torque transmission joint of the first example of the embodiment assembled in the electric power steering apparatus.
  • 6 is a cross-sectional view taken along the line DD of FIG.
  • FIG. 7 is a cross-sectional view taken along line EE in FIG.
  • FIG. 8 is a cross-sectional view corresponding to the BB cross-sectional view of FIG. 3 showing a combined body of the intermediate transmission member and the elastic member.
  • 9 (a) to 9 (c) are views showing an intermediate transmission member constituting the torque transmission joint of the first example of the embodiment, and FIG. 9 (a) is a side view of one of them.
  • 9B is a cross-sectional view taken along the line FF of FIG. 9A, and FIG. 9C is a side view of the other side.
  • FIG. 10 (a) to FIG. 10 (c) are views showing an elastic member constituting the torque transmission joint of the first example of the embodiment, and FIG.
  • FIG. 10 (a) is a side view of one side
  • 10B is a cross-sectional view taken along the line GG of FIG. 10A
  • FIG. 10C is a side view of the other side.
  • 11 (a) and 11 (b) are diagrams showing an end transmission member constituting the torque transmission joint of the first example of the embodiment
  • FIG. 11 (a) is an end view.
  • FIG. 11B is a cross-sectional view taken along the line HH in FIG.
  • FIG. 12 is a diagram corresponding to FIG. 5 regarding the second example of the embodiment.
  • FIG. 13 is a diagram corresponding to FIG. 5 regarding the third example of the embodiment.
  • FIG. 14 is a partially cutaway side view showing an example of a conventional structure of an electric power steering apparatus.
  • FIG. 15 is an enlarged II cross-sectional view of FIG.
  • FIGS. 1 and 2 A first example of the embodiment will be described with reference to FIGS.
  • the electric power steering apparatus of this example is supported rotatably with respect to the housing 3 in a state in which the housing 3, the worm wheel 4 rotatably supported with respect to the housing 3, and the worm wheel 4 are engaged.
  • a worm 7a and an electric motor 6 having an output shaft 12a for rotationally driving the worm 7a are provided.
  • the housing 3 rotatably supports the front end portion (see FIGS. 14 and 15) of the steering shaft 2 to which the steering wheel 1 is attached at the rear end portion.
  • the worm wheel 4 is fixed to a portion that is rotationally driven by the steering shaft 2.
  • the worm 7a has a worm tooth 5 that meshes with the worm wheel 4 at an axially intermediate portion, and both axial ends of the worm 7a have a pair of rolling bearings 8, 9 such as deep groove ball bearings. Thus, it is rotatably supported in the housing 3.
  • An urging mechanism 15 including an elastic body such as a coil spring or a leaf spring is provided between the rolling bearing 8 fitted on the tip of the worm 7a and the housing 3. Based on the elasticity of the elastic body of the urging mechanism 15, the worm teeth 5 of the worm 7 a are pressed or urged toward the worm wheel 4. With such a configuration, generation of rattling noise due to backlash between the worm tooth 5 and the worm wheel 4 is suppressed.
  • the electric power steering apparatus of the present invention includes a torque transmission joint 16 that connects the output shaft 12a of the electric motor 6 serving as a drive shaft and the worm 7a serving as a driven shaft so as to enable torque transmission.
  • a torque transmission joint 16 that connects the output shaft 12a of the electric motor 6 serving as a drive shaft and the worm 7a serving as a driven shaft so as to enable torque transmission.
  • the distal end portion of the output shaft 12a of the electric motor 6 and the proximal end portion of the worm 7a which are arranged in series with each other in the axial direction, are coupled via a torque transmission joint 16.
  • the torque transmission joint 16 includes an intermediate transmission member 17, a pair of end transmission members 18, and an elastic member 19.
  • the intermediate transmission member 17 has a plurality of intermediate transmission teeth 21 arranged at a plurality of locations in the circumferential direction.
  • the pair of end portion transmission members 18 has a plurality of end portion transmission teeth 37 arranged at a plurality of locations in the circumferential direction.
  • One end transmission member 18 (on the right side in FIGS. 2, 4, and 5) constituting the pair of end transmission members 18 is attached to the output shaft 12a.
  • the other end transmission member 18 (left side in FIGS. 2, 4 and 5) is attached to the base end of the worm 7a.
  • the pair of end transmission members 18 includes a plurality of end transmission teeth 37 and a plurality of intermediate transmission teeth 21 in the circumferential direction on the both sides in the axial direction of the intermediate transmission member 17 from the outside in the axial direction of the torque transmission joint 16. With respect to each other and through circumferential gaps.
  • the intermediate transmission member 17 has a function of transmitting torque between one end transmission member 18 and the other end transmission member 18.
  • the elastic member 19 is made of an elastic material including rubber and other elastomers, and is disposed at a plurality of locations in the circumferential direction, and has a plurality of insertion holes 30 through which the plurality of end transmission teeth 37 are inserted in the axial direction.
  • the elastic material 19 exhibits a buffer function between one end transmission member 18 and the intermediate transmission member and between the other end transmission member 18 and the intermediate transmission member 17.
  • the axial direction inside and outside of each member constituting the torque transmission joint 16 is based on the axial central portion of the torque transmission joint 16 in the assembled state. That is, the axially central side of the torque transmission joint 16 corresponds to the inner side in the axial direction, and both axial sides of the torque transmission joint 16 correspond to the outer side in the axial direction.
  • the pair of end portion transmission members 18 are arranged in the axial direction of the pair of end portion transmission members 18 from both outer sides in the axial direction of the torque transmission joint 16 with the inner ends in the axial direction facing each other.
  • the end portions are assembled to the intermediate transmission member 17 in a direction in which the end portions approach each other, and are arranged on both outer sides in the axial direction of the intermediate transmission member 17.
  • the intermediate transmission member 17 is formed in an annular shape as a whole by a material that is less likely to be elastically deformed (has high rigidity) than the elastic material that constitutes the elastic member 19.
  • the material constituting the intermediate transmission member 17 includes a belt material in which rubber is reinforced with a cloth, a synthetic resin such as PPS, PEEK, polyamide mixed with reinforcing fibers as necessary, an iron alloy such as carbon steel, an aluminum alloy, or the like. A metal is mentioned.
  • the intermediate transmission member 17 is formed by subjecting these materials to processing such as injection molding, casting, forging, sintering, and cutting.
  • the intermediate transmission member 17 includes a cylindrical intermediate tube portion 20, a plurality of intermediate transmission teeth 21, and a partition wall portion 27. .
  • the intermediate cylinder part 20 has circumferential recesses 22 that open on both axial sides in the radial intermediate part on both axial sides.
  • the circumferential recess 22 extends in the circumferential direction of the intermediate transmission member 17 and over the entire circumference of the intermediate transmission member 17.
  • the inner diameter side peripheral surface 23 and the outer diameter side peripheral surface 24 constituting the inner surface of the circumferential recess 22 are cylindrical surfaces centered on the central axis of the intermediate transmission member 17.
  • the intermediate cylinder part 20 has a cylindrical cover part 25 that protrudes on both sides in the axial direction at the radially outer end part on both sides in the axial direction.
  • the inner peripheral surface of the cover part 25 constitutes a single cylindrical surface together with the outer peripheral side peripheral surface 24 of the circumferential recess 22.
  • the intermediate transmission teeth 21 are arranged radially at a plurality of circumferentially equidistant intervals on the radially inner side of the intermediate cylindrical portion 20, and each radial outer end portion of the intermediate transmission teeth 21 is an intermediate cylindrical portion. 20 is coupled to the inner peripheral surface.
  • the circumferential side surfaces of the pair of intermediate transmission teeth 21 adjacent to each other in the circumferential direction are parallel to each other.
  • End transmission teeth 37 of the end transmission member 18 are inserted from both sides in the axial direction between the pair of intermediate transmission teeth 21 adjacent in the circumferential direction, and the intermediate transmission teeth 21 and the end transmission teeth 37 are formed. Are alternately arranged in the circumferential direction.
  • the engagement convex part 26 which protrudes in an axial direction is provided in the circumferential direction center part of each axial direction outer surface of the intermediate transmission teeth 21.
  • the engagement convex portion 26 has a substantially rectangular shape as viewed from the axial direction and extends in the radial direction of the intermediate transmission member 17.
  • Claw portions 28 projecting inward in the radial direction are provided on the axially outer half of the radially inner side surface of the engaging convex portions 26 that are alternately arranged in the circumferential direction of the engaging convex portions 26. ing.
  • the circumferential positions of the engaging projections 26 having the claw portions 28 are different from each other on both axial sides of the intermediate transmission member 17.
  • the partition wall 27 extends in the radial direction of the intermediate transmission member 17.
  • the partition wall 27 extends radially inward of the intermediate transmission member 17.
  • the partition wall 27 is an axial direction of a space (including a space sandwiched between a pair of intermediate transmission teeth 21 adjacent to each other in the circumferential direction) existing on the radially inner side of the intermediate cylinder portion 20.
  • the space is divided into two in the axial direction.
  • the partition wall portion 27 is a plate-like portion that is orthogonal to the central axis of the intermediate tube portion 20 and has a constant thickness dimension, and its outer peripheral portion is coupled to the intermediate tube portion 20 and the intermediate transmission teeth 21. Yes.
  • the partition wall portion 27 has a disk shape, and the outer peripheral edge of the partition wall portion 27 is coupled to the inner peripheral surface of the intermediate cylinder portion 20 in the circumferential direction.
  • the partition wall portion of the intermediate transmission member is optional as long as at least a part of the axially inner end portion of the end transmission member can face the partition wall portion in the axial direction.
  • the shape and size can be adopted, and the axial position thereof is also arbitrary.
  • the thickness dimension of the partition wall portion is arbitrary as long as the axial position of the intermediate transmission member can be regulated, but is set to about 1/15 to 1/5 of the axial length of the intermediate cylinder portion 20. can do.
  • the elastic member 19 in this example is constituted by a pair of elastic members 19.
  • Each of the pair of elastic members 19 is formed in an annular shape as a whole by an elastic material.
  • Specific examples of the elastic material constituting the elastic member 19 include rubbers such as NBR and HNBR, and elastomers such as polyurethane and silicon.
  • each of the pair of elastic members 19 has the same shape and the same size.
  • the pair of elastic members 19 are assembled symmetrically on both sides in the axial direction of the intermediate transmission member 17.
  • each of the pair of elastic members 19 has engaging recesses 29, which are through holes, at a plurality of locations in the circumferential direction that are in phase with the intermediate transmission teeth 21.
  • the elastic member 19 has slit-shaped insertion holes 30 at a plurality of locations in the circumferential direction that have the same phase as a portion (interdental portion) between a pair of adjacent intermediate transmission teeth 21.
  • the engagement recesses 29 and the insertion holes 30 are alternately arranged in the circumferential direction.
  • the engaging recess 29 has a substantially rectangular shape whose shape viewed from the axial direction extends in the radial direction of the elastic member 19.
  • the engagement recess 29 engages with an engagement protrusion 26 provided on the outer surface of the intermediate transmission tooth 21 in the axial direction, and prevents the elastic member 19 from rotating relative to the intermediate transmission member 17.
  • an axially outer portion of the radially inner portion of the engaging recess 29 is provided with a thinning portion having a shape that extends the engaging recess 29 radially inward.
  • An engagement beam 31 extending in the circumferential direction is provided on the inner side in the axial direction of the radially inner portion of the engagement recess 29.
  • the insertion hole 30 extends in the radial direction of the elastic member 19 and opens at the inner periphery of the elastic member 19.
  • the end transmission teeth 37 of the end transmission member 18 are inserted into the insertion hole 30 from the outside in the axial direction.
  • the circumferential interval t 30 between the circumferential edges of the insertion hole 30 is smaller than the circumferential interval T 21 between the adjacent intermediate transmission teeth 21 (t 30 ⁇ T 21).
  • the elastic member 19 can include elastic protrusions 32 that protrude toward the center in the circumferential direction on a part in the radial direction of at least one side edge of each circumferential side edge of the insertion hole 30.
  • elastic protrusions 32 projecting toward the center in the circumferential direction are provided on the radially outer side portions of both side edges of the insertion hole 30 in the circumferential direction.
  • the circumferential interval between the tip surfaces of the elastic protrusions 32 facing in the circumferential direction corresponds to the circumferential interval t 30 between the circumferential edges of the insertion hole 30.
  • the circumferential interval between the portions radially deviated from the elastic protrusion 32 is also smaller than the circumferential interval T 21 between the adjacent intermediate transmission teeth 21.
  • the shape of the elastic protrusion 32 viewed from the axial direction is a convex arc shape.
  • the portions that are radially removed from the elastic protrusions 32 are flat portions parallel to each other.
  • the shape and position of the elastic protrusion 32 are not limited to the illustrated structure.
  • other shapes such as a triangle and a trapezoid can be adopted as the shape of the elastic protrusion 32 viewed from the axial direction.
  • the elastic protrusions are preferably arranged at the radially outward portions of both side edges in the circumferential direction of the insertion hole, but can also be arranged, for example, at the radial center portions of both circumferential edges of the insertion hole.
  • the number of elastic protrusions is not limited to one, and may be plural.
  • the elastic protrusion 32 may be omitted, and one or both of the circumferential direction both side edges of the insertion hole may be configured by a flat portion.
  • the elastic member 19 has a circumferential convex portion 33 projecting inward in the axial direction at a radially outer end located radially outside the engaging concave portion 29 and the insertion hole 30.
  • the circumferential convex portion 33 extends in the circumferential direction of the elastic member 19 and over the entire circumference of the elastic member 19.
  • the pair of elastic members 19 are assembled symmetrically on both sides in the axial direction of the intermediate transmission member 17 to form a combined body 35 of the intermediate transmission member 17 and the pair of elastic members 19. In the state in which the coupling body 35 is configured, the pair of elastic members 19 covers the axially outer surfaces on both sides of the intermediate transmission member 17.
  • the circumferential convex portion 33 of the elastic member 19 is press-fitted inside the circumferential concave portion 22 of the intermediate transmission member 17, and the inner circumferential surface 23 and the circumferential convex portion of the circumferential concave portion 22 are pressed.
  • the inner circumferential surface of the portion 33, the outer circumferential surface 24 of the circumferential recess 22 and the outer circumferential surface of the circumferential projection 33 are all in elastic contact and strongly frictionally engaged.
  • the elastic member 19 is fitted into the cover portion 25 of the intermediate transmission member 17 by an interference fit, and the inner peripheral surface of the cover portion 25 and the outer peripheral surface of the elastic member 19 are in elastic contact and strongly frictionally engaged. .
  • a structure in which a gap is provided at least in one circumferential direction between the inner circumferential surface 23 and the inner circumferential surface of the circumferential convex portion 33, the outer circumferential side surface 24, A structure in which a gap is provided at least at one place in the circumferential direction between the outer circumferential surface of the circumferential convex portion 33, and only in one circumferential surface of the inner diameter side circumferential surface 23 and the outer diameter side circumferential surface 24 in the circumferential direction.
  • a structure in which a discontinuous portion is provided at a location can also be adopted.
  • the engagement convex portion 26 of the intermediate transmission member 17 When the engagement convex portion 26 of the intermediate transmission member 17 is inserted and engaged inside the engagement concave portion 29 of the elastic member 19, relative rotation between the intermediate transmission member 17 and the elastic member 19 is prevented. Further, the claw portion 28 provided on the radially inner side of the engagement convex portion 26 engages with the outer surface in the axial direction of the engagement beam 31. Thereby, the elastic member 19 is prevented from being displaced outward in the axial direction with respect to the intermediate transmission member 17, and the separation of the intermediate transmission member 17 and the elastic member 19 is prevented. In a state where the elastic member 19 is attached to the intermediate transmission member 17, the slit-shaped insertion hole 30 is disposed at a position that is in phase with the portion between the adjacent intermediate transmission teeth 21.
  • the outer surface in the axial direction of the elastic member 19 is positioned on the outer side in the axial direction from the front end surface of the engaging convex portion 26 positioned on the outermost side in the axial direction among the outer surfaces in the axial direction on both sides of the intermediate transmission member 17. That is, the elastic member 19 protrudes outward in the axial direction from the axially outer surfaces on both sides of the intermediate transmission member 17. Further, the inner peripheral surface of the elastic member 19 is located on the radially inner side from the radially inner side surface of the intermediate transmission tooth 21 of the intermediate transmission member 17 and the radially inner end edge of the claw portion 28. That is, the elastic member 19 projects radially inward from the intermediate transmission member 17.
  • Each of the pair of end portion transmission members 18 is formed in an annular shape as a whole.
  • the material constituting the end transmission member 18 include synthetic resins such as PPS, PEEK, and polyamide mixed with reinforcing fibers as necessary, and metals such as iron alloys, copper alloys, and aluminum alloys.
  • the end transmission member 18 is formed by subjecting these materials to processing such as injection molding, casting, forging, sintering, and cutting.
  • the pair of end transmission members 18 have the same shape and the same size.
  • the pair of end transmission members 18 are engaged with both sides in the axial direction of the combined body 35 of the intermediate transmission member 17 and the pair of elastic members 19.
  • each of the pair of end portion transmission members 18 includes a cylindrical end tube portion 36 that is an end connection portion, and a plurality of end portion transmissions. And teeth 37.
  • Each of the plurality of end portion transmission teeth 37 has a substantially rectangular plate shape, and is arranged radially at a plurality of locations that are equidistant in the circumferential direction on the radially outer side of the end tube portion 36.
  • the radially inner ends of the end transmission teeth 37 are coupled to the outer peripheral surface of the end cylinder 36.
  • each of the pair of end transmission members 18 and the axially inner ends of the constituent parts thereof are the shafts of the torque transmission joints 18 of the respective end transmission members 18.
  • the end part located in the direction center side means the axial direction outer end part means the end part located in the axial direction both sides of the joint 18 for torque transmission.
  • One of the pair of end portion transmission members 18 is inserted into the inner side in the radial direction of both side portions in the axial direction of the coupling body 35 (FIGS. 2, 4, and FIG. 6, the right side in FIG. 7), the end transmission teeth 37 provided on the end transmission member 18 do not rattle in the circumferential direction in the insertion hole 30 of one elastic member 19, and preferably tighten in the circumferential direction. Engage with the allowance. Further, the end transmission teeth 37 provided on the other end transmission member 18 (left side in FIGS. 2, 4, 6, and 7) have a circumferential direction in the insertion hole 30 of the other elastic member 19. The engagement is preferably performed without rattling, preferably with a circumferential margin.
  • the intermediate transmission teeth 37 engage with each other between the adjacent intermediate transmission teeth 21 via a circumferential gap. That is, as shown in FIG. 7, a first circumferential gap ⁇ exists between the circumferential side surfaces of the straight portion 39 of the end transmission tooth 37 and the intermediate transmission tooth 21.
  • the end transmission teeth 37 can be engaged with the insertion hole 30 of the elastic member 19 with a circumferential gap interposed therebetween.
  • the circumferential gap ⁇ is made larger than the circumferential gap.
  • a radial clearance ⁇ between the radial outer end surface, which is the distal end surface of the end transmission tooth 37, and the bottom surface (radial outer end portion of the inner surface) of the insertion hole 30.
  • a radial gap ⁇ is interposed between the radially outer end surface of the end transmission teeth 37 and the bottom surface of the portion between the adjacent intermediate transmission teeth 21 (the inner peripheral surface of the intermediate cylinder portion 20).
  • the radial gap ⁇ is smaller than the radial gap ⁇ ( ⁇ ⁇ ).
  • a radial gap ⁇ is interposed between the bottom surface of the portion between the adjacent end transmission teeth 37 (the outer peripheral surface of the end cylindrical portion 36) and the inner peripheral surface of the elastic member 19, and the adjacent end portions
  • a radial clearance ⁇ is interposed between the bottom surface of the portion between the transmission teeth 37 and the radially inner end surface that is the tip surface of the intermediate transmission tooth 21.
  • the radial gap ⁇ is smaller than the radial gap ⁇ ( ⁇ ⁇ ).
  • the end cylinder portion 36 of the one end transmission member 18 is tightened against the distal end portion of the output shaft 12a (see FIG. 2). It is externally fixed by a structure capable of transmitting torque, such as a cylindrical surface fitting having a margin, a spline fitting having a margin, and caulking. Further, the end cylinder portion 36 of the other end transmission member 18 is externally fitted and fixed to the base end portion of the worm 7a (see FIG. 2), similarly to the one end transmission member 18. However, the end transmission member 18 can also be formed integrally with the distal end portion of the output shaft 12a and the proximal end portion of the worm 7a.
  • the inner end surface 34 in the axial direction of one end transmission member 18 and the front end surface (axial end surface) 38 of the output shaft 12 a are arranged on the same virtual plane, and the inner end surface 34 in the axial direction of the other end transmission member 18.
  • the base end face (axial end face) 39 of the worm 7a is disposed on the same virtual plane.
  • the distal end surface 38 of the output shaft 12a and the proximal end surface 39 of the worm 7a are also opposed in the axial direction to both axial side surfaces of the partition wall portion 27 constituting the intermediate transmission member 17.
  • the axial distance (interval) L 34 between the axial inner end surfaces 34 of the pair of end transmission members 18 is the axial width dimension (thickness dimension) of the partition wall portion 27 constituting the intermediate transmission member 17. Greater than W 27 (L 34 > W 27 ).
  • the axial position of the coupling body 35 is regulated by the axial inner end surfaces 34 of the pair of end portion transmission members 18. That is, the coupling body 35 can be displaced in the axial direction only within a range in which the partition wall portion 27 can be displaced in the axial direction between the axially inner end surfaces 34 of the pair of end portion transmission members 18.
  • the rotational torque of the output shaft 12a is one end transmission member.
  • 18, one elastic member 19, intermediate transmission member 17, the other elastic member 19, the other end transmission member 18, and the worm 7 a are transmitted in this order.
  • the rotational torque of the output shaft 12 a is transmitted from one end transmission member 18 to one elastic member 19 through an engagement portion between the end transmission teeth 37 and the insertion hole 30.
  • the torque transmitted to one elastic member 19 is transmitted to the intermediate transmission member 17 through the engagement portion between the engagement concave portion 29 of one elastic member 19 and the engagement convex portion 26 of the intermediate transmission member 17.
  • the torque transmitted to the intermediate transmission member 17 is transmitted to the other elastic member 19 through an engagement portion between the engagement convex portion 26 of the intermediate transmission member 17 and the engagement concave portion 29 of the other elastic member 19.
  • the torque transmitted to the other elastic member 19 is transmitted to the other end transmission member 18 and the worm 7 a through the engaging portion between the insertion hole 30 and the end transmission teeth 37.
  • the mutually opposing circumferential side surfaces of a pair of adjacent intermediate transmission teeth 21 are parallel to each other, and both circumferential side surfaces of the end transmission teeth 37 are also parallel to each other. It has become.
  • the circumferential side surfaces of the intermediate transmission teeth 21 and the end transmission teeth 37 are adjacent to each other in the circumferential direction so that the circumferential side surfaces of the intermediate transmission teeth 21 and the end transmission teeth 37 can easily come into contact with each other (surface contact).
  • At least one of a configuration in which the circumferential side surfaces of the pair of intermediate transmission teeth 21 facing each other is inclined and a configuration in which the circumferential side surfaces of the end transmission teeth 37 are inclined to each other is adopted. You can also
  • the torsional rigidity of the torque transmission joint 16 decreases when the torque to be transmitted is small and increases when the torque to be transmitted is large. Has characteristics. However, when the present invention is implemented, for example, the torsional rigidity of the torque transmission joint 16 is increased in two stages by making the circumferential clearance ⁇ different from each other between the pair of end transmission members 18. Can also be more.
  • each of the pair of end portion transmission members 18 radial gaps are respectively formed in the engagement portions between the end portion transmission teeth 37 and the elastic member 19 and the engagement portions between the end portion transmission teeth 37 and the intermediate transmission teeth 21. ⁇ , ⁇ , ⁇ , and ⁇ are present.
  • the axial distance L 39 between the end side surfaces 39 of the pair of end transmission members 18 is larger than the axial width dimension W 35 of the combined body 35 (L 39 > W 35 ). For this reason, the inclination of the central axes of the coupling body 35 and the pair of end portion transmission members 18 can be allowed without difficulty.
  • the pair of end transmission members 18 By smoothly tilting the central axis of the coupling body 35 with respect to the central axis, smooth torque transmission can be performed. Also, the sum of the misalignment allowed between one end transmission member 18 and the coupling body 35 and the misalignment allowed between the other end transmission member 18 and the coupling body 35 is output. Misalignment is allowed between the shaft 12a and the worm 7a. For this reason, misalignment between the output shaft 12a and the worm 7a can be appropriately allowed.
  • the intermediate transmission teeth are provided in the radially inner portion of the intermediate transmission member, and the end transmission teeth are provided in the radially outer portion of the pair of end transmission members.
  • the intermediate transmission teeth are provided in the radially outer portion of the intermediate transmission member, and the end transmission teeth are provided in the radial inner portion of the end transmission member. It can also be adopted.
  • the partition wall portion extends radially outward.
  • the elastic member is composed of a pair of elastic members including an elastic member that engages with one end transmission member and an elastic member that engages with the other end transmission member.
  • the elastic member is constituted by a single elastic member including a portion that engages with one end transmission member and a portion that engages with the other end transmission member. You can also.
  • the elastic member can be assembled to the intermediate transmission member using the elasticity of the elastic member.
  • the number and the circumferential position of the engagement protrusions of the intermediate transmission member, and the engagement recesses of the elastic member are not particularly limited.
  • each of the pair of end portion transmission members includes a flange portion facing the axial side surface of the combined body of the intermediate transmission member and the elastic member.
  • the axial distance between the flange portions of the pair of end transmission members is set in the state in which the torque transmission joint is assembled to the electric power steering device. Slightly larger than the axial width dimension.
  • the present invention is also applicable to a torque transmission joint that does not include an elastic member.
  • the partition wall 27 a of the intermediate transmission member 17 has a pair of protrusions 40.
  • the pair of projecting portions 40 is disposed at the radially central portion of the partition wall portion 27a and is located radially inward of the intermediate transmission teeth 21, and projects to both sides in the axial direction.
  • the shape of the protrusion 40 is a partial sphere. In a state in which the torque transmission joint 16 is assembled to the electric power steering device, the pair of projecting portions 40 face the distal end surface 38 of the output shaft 12a and the proximal end surface 39 of the worm 7a in the axial direction.
  • the protrusion part 40 shape can also be varied from this example. Further, a configuration in which each of the protrusions 4 is always in contact with the distal end surface 38 of the output shaft 12a and the proximal end surface 39 of the worm 7a can be employed. Other configurations and operations of the second example of the embodiment are the same as those of the first example of the embodiment.
  • the intermediate transmission member 17 has a circular through hole 41 at the radial center of the partition wall 27b.
  • the diameter dimension of the through hole 41 (the inner diameter dimension of the partition wall portion 27 b) is equal to the inner diameter dimension of the end cylinder portion 36 of the end transmission member 18.
  • the diameter dimension of the through hole 41 is as long as at least a part of the axially inner end surface 34 of the end transmission member 18 faces the partition wall portion 27b in the axial direction. It can also be different.
  • the weight of the intermediate transmission member 17 can be reduced by the amount of the through holes 41 provided.
  • Other configurations and operations of the third example of the embodiment are the same as those of the first example of the embodiment.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Power Steering Mechanism (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)

Abstract

L'invention concerne une structure dans laquelle il est possible d'autoriser de manière appropriée un défaut d'alignement entre un arbre d'entraînement et un arbre entraîné, la position de direction axiale d'un élément ayant la structure et étant positionné à une position intermédiaire dans une direction de transmission de couple pouvant être limitée. Un élément de transmission intermédiaire (17) possède des dents de transmission intermédiaires (21) au niveau d'une pluralité de positions dans une direction circonférentielle. Chaque élément d'une paire d'éléments de transmission d'extrémité 18 comporte des dents de transmission 37 d'extrémité au niveau d'une pluralité de positions dans la direction circonférentielle. Les dents de transmission 37 d'extrémité et les dents de transmission intermédiaires 21 sont disposées en alternance dans la direction circonférentielle, des espaces étant maintenus entre elles dans la direction circonférentielle. L'élément de transmission intermédiaire 17 comporte une paroi de séparation 27 s'étendant dans sa direction radiale et faisant face, dans la direction axiale, à la face d'extrémité axialement interne 34 de chaque élément de la paire d'éléments de transmission d'extrémité 18.
PCT/JP2019/009761 2018-03-12 2019-03-11 Joint de transmission de couple et dispositif de direction assistée électrique WO2019176872A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE212019000215.3U DE212019000215U1 (de) 2018-03-12 2019-03-11 Drehmomentübertragungsgelenk und elektrische Servolenkung
JP2020506519A JP6927411B2 (ja) 2018-03-12 2019-03-11 トルク伝達用継手および電動式パワーステアリング装置

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2018043977 2018-03-12
JP2018-043977 2018-03-12

Publications (1)

Publication Number Publication Date
WO2019176872A1 true WO2019176872A1 (fr) 2019-09-19

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PCT/JP2019/009761 WO2019176872A1 (fr) 2018-03-12 2019-03-11 Joint de transmission de couple et dispositif de direction assistée électrique

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Country Link
JP (1) JP6927411B2 (fr)
DE (1) DE212019000215U1 (fr)
WO (1) WO2019176872A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001165185A (ja) * 1999-12-07 2001-06-19 Central Japan Railway Co 鉄道車両用撓み軸継手
JP2001206221A (ja) * 2000-01-27 2001-07-31 Hitachi Ltd 鉄道車両
WO2016047643A1 (fr) * 2014-09-26 2016-03-31 日本精工株式会社 Joint de transmission de couple et dispositif de direction assistée électrique
WO2016047188A1 (fr) * 2014-09-26 2016-03-31 日本精工株式会社 Joint de transmission de couple et dispositif de direction assistée électrique
WO2016084403A1 (fr) * 2014-11-28 2016-06-02 日本精工株式会社 Accouplement de transmission de couple et dispositif de direction assistée électrique
WO2017154870A1 (fr) * 2016-03-08 2017-09-14 日本精工株式会社 Assemblage pour transmission de couple, et dispositif de direction assistée électrique

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001165185A (ja) * 1999-12-07 2001-06-19 Central Japan Railway Co 鉄道車両用撓み軸継手
JP2001206221A (ja) * 2000-01-27 2001-07-31 Hitachi Ltd 鉄道車両
WO2016047643A1 (fr) * 2014-09-26 2016-03-31 日本精工株式会社 Joint de transmission de couple et dispositif de direction assistée électrique
WO2016047188A1 (fr) * 2014-09-26 2016-03-31 日本精工株式会社 Joint de transmission de couple et dispositif de direction assistée électrique
WO2016084403A1 (fr) * 2014-11-28 2016-06-02 日本精工株式会社 Accouplement de transmission de couple et dispositif de direction assistée électrique
WO2017154870A1 (fr) * 2016-03-08 2017-09-14 日本精工株式会社 Assemblage pour transmission de couple, et dispositif de direction assistée électrique

Also Published As

Publication number Publication date
DE212019000215U1 (de) 2020-12-16
JPWO2019176872A1 (ja) 2021-02-12
JP6927411B2 (ja) 2021-08-25

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