WO2017010087A1 - Accouplement - Google Patents

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Publication number
WO2017010087A1
WO2017010087A1 PCT/JP2016/003295 JP2016003295W WO2017010087A1 WO 2017010087 A1 WO2017010087 A1 WO 2017010087A1 JP 2016003295 W JP2016003295 W JP 2016003295W WO 2017010087 A1 WO2017010087 A1 WO 2017010087A1
Authority
WO
WIPO (PCT)
Prior art keywords
sleeve
joint
coupling
worm
shaft
Prior art date
Application number
PCT/JP2016/003295
Other languages
English (en)
Japanese (ja)
Inventor
城戸　隆一
元祥 吉川
Original Assignee
バンドー化学株式会社
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 バンドー化学株式会社 filed Critical バンドー化学株式会社
Priority to JP2016568981A priority Critical patent/JP6158448B2/ja
Publication of WO2017010087A1 publication Critical patent/WO2017010087A1/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

Definitions

  • the present invention relates to a coupling, and particularly to a flexible joint.
  • a coupling is known as a structure for connecting a drive shaft and a driven shaft whose ends are abutted to each other (see Patent Document 1).
  • a pair of joint parts composed of a high elastic body that is drive-coupled to each end of the drive shaft and the driven shaft, and a cylindrical shape composed of a low elastic body that fits outside the joint part.
  • a sleeve is provided, and a plurality of teeth extending in the direction along the axis is formed on the outer periphery of the joint.
  • a plurality of spline grooves parallel to the center line are formed on the inner peripheral surface of the sleeve, and by engaging the teeth of the joint portion with these spline grooves, the torque due to the rotation of the drive shaft is sleeved. It is the structure which transmits to a driven shaft via.
  • the misalignment between the drive and driven shafts is adapted by the elasticity of the sleeve and the play provided between the sleeve and the tooth portion of the joint, so The quiet transmission can be realized.
  • the technique is used in a connecting portion between a worm in an electric power steering apparatus for an automobile and an output shaft of a control motor including an electric motor that drives the worm.
  • the present invention has been made in view of such points, and the object of the present invention is to improve the structure of the coupling, thereby realizing high rigidity in the torque transmission (rotation) direction, In the direction in which the driven shaft is eccentric, an extremely low rigidity is realized in the initial stage.
  • the tapered portion on the tooth portion of the joint portion, when the driving shaft and the driven shaft are eccentric, the tapered portion does not contact the inner wall of the spline groove. While suppressing the occurrence of the eccentric reaction force, a portion having a uniform width of the tooth portion in the torque transmission direction immediately interferes with the spline groove so that high torque transmission can be realized.
  • the first invention is a coupling in which a driving shaft and a driven shaft whose end portions are abutted with each other are connected for torque transmission in a concentric state or an eccentric state in which an eccentric displacement amount varies.
  • a pair of joint portions provided at end portions of the drive shaft and the driven shaft and arranged to face each other; and a cylindrical shape that is externally fitted between the pair of joint portions and connects the joint portions.
  • a plurality of spline grooves having a constant groove width extending in a direction along the center line of the sleeve are provided at intervals in the circumferential direction.
  • a plurality of tooth portions meshing with the spline grooves are formed on the outer peripheral surfaces of the pair of joint portions, and the tooth portions have a constant width along the axial direction. Uniform width and relative Wherein the width of the teeth toward the joint portion and is narrower tapered portion is provided that.
  • the second invention is characterized in that, in the first invention, the tapered portion is narrowed by an inclined surface inclined with respect to the axial direction.
  • the contact length between the joint portion and the sleeve is S
  • the gap between the pair of joint portions is G
  • the maximum eccentricity that requires play between the drive shaft and the driven shaft is required.
  • any one of the first to third aspects when the contact length between the joint portion and the sleeve is S, and the axial length of the tapered portion is L, 0.8S ⁇ L ⁇ 0.99S.
  • the driven shaft is a worm that is drivingly connected to a steering shaft of an electric power steering apparatus for an automobile via a worm wheel. Is an output shaft of a control motor for driving the worm.
  • a sixth invention is characterized in that, in any one of the first to fifth inventions, the joint portion is made of a high elastic body, and the sleeve is made of a low elastic body.
  • the coupling of the present invention can be applied between the worm of the electric power steering apparatus in which eccentricity can occur and the output shaft of the control motor that drives the worm.
  • the tapered portion is provided on the tooth portion on the outer periphery of the joint. Even when the drive shaft and driven shaft are eccentric, the tip of the tooth portion of the joint portion contacts the inner wall of the spline groove of the sleeve and prevents the occurrence of an eccentric reaction force that inhibits torque transmission. Efficient torque transmission can be realized by contact between the width portion and the spline groove.
  • FIG. 2 is an enlarged view showing a control motor and a reduction gear portion in FIG.
  • FIG. 2 is a perspective view of the joint part of the coupling concerning an embodiment.
  • It is a perspective view which shows the connection structure of the joint part and sleeve of a coupling which concern on embodiment.
  • It is a schematic diagram showing the connection state of the tooth part of a joint part, and a spline groove when the drive shaft and driven shaft which concern on embodiment are concentric.
  • FIG. 6 is a view corresponding to FIG. 5 when the drive shaft and the driven shaft according to the embodiment are in a maximum eccentric state.
  • FIG. 8 is a view corresponding to FIG. 7 and showing measurement results according to Comparative Example 1.
  • FIG. 9 is a diagram corresponding to FIG. 8 and showing measurement results according to Comparative Example 1.
  • FIG. 8 is a diagram corresponding to FIG. 7 and showing measurement results according to Comparative Example 2.
  • FIG. 9 is a diagram corresponding to FIG. 8 and showing measurement results according to Comparative Example 2.
  • 6 is a side view of a coupling according to Comparative Example 1.
  • FIG. FIG. 14 is a diagram corresponding to FIG. 13 according to Comparative Example 2.
  • FIG. 1 shows an outline of an electric power steering apparatus 10 for an automobile according to an embodiment.
  • a steering wheel 1 that is steered by a driver is attached to a rear end portion of a column shaft 2 at the center thereof so as to rotate together.
  • the front end portion of the column shaft 2 is connected to the upper end portion of the intermediate shaft 6 (intermediate shaft) via the reduction gear portion 3.
  • the lower end portion of the intermediate shaft 6 is connected to the pinion shaft 7.
  • the pinion shaft 7 is provided with a pinion (not shown), and this pinion is meshed with a rack (not shown) in the rack housing 8 extending in the vehicle width direction.
  • the rack is slidable within the rack housing 8, and both ends thereof are connected to the left and right front wheels (not shown) via tie rods 9, whereby the steering force of the steering wheel 1 by the driver is transmitted to the front wheels.
  • the front wheels are steered.
  • the reduction gear unit 3 is provided with a torque sensor 5.
  • the torque sensor 5 detects the steering torque of the steering wheel 1 by the driver and controls the control motor 4.
  • a worm wheel 33 is rotatably and integrally attached to the column shaft 2 in the reduction gear portion 3.
  • the worm wheel 33 is engaged with the worm 31.
  • the worm wheel 33 is configured to rotate with the rotation of the worm 31.
  • the worm 31 constitutes the driven shaft of the present invention, and at one end thereof, the output shaft 41 of the control motor 4 made of an electric motor is in a state in which the end thereof is confronted with one end of the worm 31 in a concentric state.
  • the output shaft 41 of the control motor 4 constitutes a drive shaft, and a coupling 50 according to the embodiment of the present invention is provided to connect the output shaft 41 (drive shaft) and the worm 31 (driven shaft). It has been.
  • the control motor is controlled in response to a control signal from a controller (not shown), and the output signal of the torque sensor 5 is input to the controller, whereby the torque detected by the torque sensor 5 is detected.
  • the control motor 4 is actuated on the basis of the rotation of the output shaft 41, and the torque generated by the rotation of the output shaft 41 is transmitted to the worm 31 via the coupling 50 to rotate the worm wheel 33 engaged with the worm 31. 2, steering assist (assist) of the steering wheel 1 according to the torque generated by steering is performed, and the function as the electric power steering device 10 is realized.
  • FIG. 3 and 4 show the coupling 50 in an enlarged manner.
  • the coupling 50 has a pair of joint portions 51 and 51 and a cylindrical shape that is externally fitted between the pair of joint portions 51 and 51.
  • the sleeve 56 is provided.
  • the sleeve 56 that fits outside the joint portion 51 is indicated by an imaginary line.
  • FIG. 4 shows the coupling structure of the joint portion 51 and the sleeve 56 of the coupling 50. In order to make the structure easy to understand, half of the sleeve 56 and half of the joint portion 51 on one side (front side of the paper) are omitted. ing.
  • the pair of joint portions 51, 51 are both cylindrical with a uniform diameter, and are composed of, for example, a high elastic body such as iron (elastic modulus: 206 GPa). Both joint portions 51, 51 are arranged to face each other, and one joint portion 51 has one end portion of the worm 31 (the end portion on the control motor 4 side) and the other joint portion 51 has the other joint portion 51.
  • the output shaft 41 of the control motor 4 is inserted in a rotating manner.
  • the pair of joint portions 51 and 51 are drivingly connected to the end portion of the output shaft 41 of the control motor 4 as the drive shaft and the end portion of the worm 31 as the driven shaft.
  • the cylindrical sleeve 56 is externally fitted to the joint portions 51, 51 to connect the joint portions 51, 51, and is a low-elastic body such as rubber or resin (elastic modulus: 100 MPa to 1000 MPa). ).
  • a plurality of spline grooves 57, 57,... Extending in the direction along the center line of the sleeve 56 across the longitudinal ends of the sleeve 56 are spaced at equal pitches in the circumferential direction on the inner peripheral surface of the sleeve 56. Is provided.
  • Each spline groove 57 has a constant groove width and groove depth over the entire length (between both ends in the length direction of the sleeve 56), and the spline groove 57 of the sleeve 56 has the joint portion 51.
  • the tooth part 52 is configured to mesh.
  • each tooth part 52 on the outer peripheral surface of each joint part 51 has a uniform width part 53a having a constant width, and the width of the tooth part 52 increases toward the joint part 51 facing each other.
  • a narrowing point 53b is provided.
  • the tapered portion 53b has an inclined surface that is inclined with respect to the axial direction, and the width of the tooth portion 52 is tapered.
  • the contact length between the joint portion 51 and the sleeve 56 is S
  • the length of the tip 53b in the axial direction is L
  • the gap between the pair of joint portions 51 and 51 is G
  • D is the maximum eccentric displacement that requires play between the shaft 41 (drive shaft) and the worm 31 (driven shaft)
  • A is the inclination angle that the side surface of the tooth portion of the tapered portion 53b is in the axial direction of the output shaft 41 and the worm 31.
  • an inclination angle A satisfying the relationship of tanA ⁇ D / (S + G) can be applied to the tapered portion 53b of the tooth portion 52 of the joint portion 51.
  • the relationship 0.8S ⁇ L ⁇ 0.99S is preferably satisfied.
  • the “maximum eccentric displacement that requires play” is an eccentric displacement that needs to suppress the eccentric reaction force when the output shaft 41 (drive shaft) and the worm 31 (driven shaft) are eccentric. It means the maximum value.
  • Rotational torque due to steering of the steering wheel 1 by the driver is detected by the torque sensor 5, and the control motor 4 is operated and controlled by the controller according to the magnitude, and the output shaft 41 of the control motor 4 rotates.
  • the output shaft 41 and the worm 31 in the reduction gear unit 3 are connected via the coupling 50, the rotation of the output shaft 41 is transmitted to the worm 31, thereby the worm 31 and the worm 31.
  • the meshed worm wheel 33 is rotated.
  • the worm 31 is pressurized in a direction perpendicular to the axis (the direction of pressing against the worm wheel 33).
  • This preload is controlled by a pressurizing unit 32 provided at the end of the worm 31 opposite to the control motor 4, and due to this preload, the axis of the worm 31 is the axis of the output shaft 41 of the control motor 4. It becomes an eccentric state.
  • FIG. 6 schematically shows a connection state between the joint portion 51 and the sleeve 56 when the output shaft 41 (drive shaft) and the worm 31 (driven shaft) of the control motor 4 are in the maximum eccentric state.
  • the configuration of the sleeve 56 is drawn with virtual lines.
  • the joint portion 51 on the lower side in FIG. 6 connected to the worm 31 is the maximum eccentricity that requires play to the right in the drawing with respect to the joint portion 51 on the upper side in FIG. 6 connected to the output shaft 41 of the control motor 4.
  • the displacement amount D is eccentric.
  • the sleeve 56 is inclined due to the eccentricity of the joint portion 51 connected to the worm 31, and the spline groove 57 provided on the inner peripheral surface of the sleeve 56 is also inclined accordingly.
  • the tooth portion 52 of the joint portion 51 is provided with a tapered portion 53 b that becomes narrower toward the opposing joint portion 51, the tapered portion 53 b becomes a spline in the sleeve 56.
  • the tapered portion 53 b becomes a spline in the sleeve 56.
  • extremely low rigidity is realized at the initial stage in the direction in which the output shaft 41 (drive shaft) and the worm 31 (driven shaft) of the control motor 4 are eccentric.
  • D is the maximum eccentric displacement that requires play between the worm 31 and the worm 31 (driven shaft)
  • the relationship between the inclination angle A between the tooth side surface of the tip 53b and the axial direction of the output shaft 41 and the worm 31 is tanA ⁇ D / (S + G), so that even if the amount of eccentric displacement between the output shaft 41 and the worm 31 becomes maximum, the tapered portion 53b of the tooth portion 52 of the joint portion 51 contacts the inner wall of the spline groove 57 in the sleeve 56. Therefore, it is possible to more reliably prevent the generation of a reaction force that inhibits torque transmission.
  • the eccentric reaction force can be sufficiently suppressed with respect to the eccentric displacement.
  • L ⁇ 0.99S
  • the tapered portion 53b is within the range of the contact length S, and there is always a section where the interval between the joint portion 51 and the sleeve 56 is zero. Interfere immediately.
  • the coupling of the present invention is used for the connection between the output shaft 41 of the control motor 4 and the worm 31 of the electric power steering apparatus 10 for an automobile.
  • the present invention can also be applied to the connection between the motor and the driven shaft, and similar effects can be obtained.
  • the relationship between the twist angle and the transmission torque is almost proportional, and it can be read that high torque transmission efficiency is realized.
  • FIG. 9 and 10 show the measurement results of the transmission torque and the eccentric reaction force in Comparative Example 1.
  • FIG. 9 when the play between the sleeve and the joint is eliminated, a high transmission torque proportional to the torsion angle can be realized.
  • the eccentric reaction force also increases at a high rate in a form proportional to the eccentric displacement. This is a result of decent influence of the eccentricity of the joint due to the absence of play between the sleeve and the joint.
  • the torque transmission with respect to the torsional angle can realize high torque transmission efficiency that appears when the play between the sleeve and the joint is eliminated, while it appears when the eccentric displacement occurs.
  • the eccentric reaction force it is possible to suppress the eccentric reaction force that appears when play is provided between the sleeve and the joint. Accordingly, it can be seen that in the coupling of the present invention, high rigidity is realized in the torque transmission direction, while extremely low rigidity is realized in the initial direction in the direction in which the two rotating shafts are eccentric.
  • the present invention is extremely useful for a coupling used to connect a drive shaft and a driven shaft that may cause eccentricity, such as those used in an electric power steering device of an automobile.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Power Steering Mechanism (AREA)

Abstract

Selon l'invention, une pluralité de rainures de cannelures (57) sont disposées de manière mutuellement espacée dans la direction circonférentielle sur la surface périphérique interne d'un manchon (56), les rainures de cannelures (57) ayant une largeur de rainure fixe et s'étendant dans une direction le long de la ligne centrale du manchon (56). Une pluralité de dents (52) qui s'engrènent avec les rainures de cannelure (57) sont formées sur la surface périphérique externe d'une paire de parties de raccord (51). Les dents (52) comportent des sections de largeur uniforme (53a) dans lesquelles la largeur des dents (52) est fixe le long de la direction axiale, et des sections effilées (53b) dans lesquelles la largeur des dents (52) devient plus étroite vers les parties de raccord opposées (51).
PCT/JP2016/003295 2015-07-13 2016-07-12 Accouplement WO2017010087A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2016568981A JP6158448B2 (ja) 2015-07-13 2016-07-12 カップリング

Applications Claiming Priority (2)

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JP2015-140030 2015-07-13
JP2015140030 2015-07-13

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WO2017010087A1 true WO2017010087A1 (fr) 2017-01-19

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108945088A (zh) * 2018-06-20 2018-12-07 新乡艾迪威汽车科技有限公司 一种新型电动转向系统间隙补偿机构
WO2019176871A1 (fr) * 2018-03-12 2019-09-19 日本精工株式会社 Joint pour transmission de couple et dispositif de direction assistée électrique

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009269518A (ja) * 2008-05-09 2009-11-19 Nsk Ltd ステアリング装置
JP2011173464A (ja) * 2010-02-23 2011-09-08 Jtekt Corp スプライン伸縮軸の製造方法、スプライン伸縮軸及び車両操舵用伸縮軸
JP2014035040A (ja) * 2012-08-09 2014-02-24 Ricoh Co Ltd 駆動伝達装置、画像形成装置

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11270571A (ja) * 1998-03-25 1999-10-05 Mitsubishi Heavy Ind Ltd バックラッシ量調整装置
JP2011001055A (ja) * 2010-06-14 2011-01-06 Yanmar Co Ltd 舶用減速逆転機

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009269518A (ja) * 2008-05-09 2009-11-19 Nsk Ltd ステアリング装置
JP2011173464A (ja) * 2010-02-23 2011-09-08 Jtekt Corp スプライン伸縮軸の製造方法、スプライン伸縮軸及び車両操舵用伸縮軸
JP2014035040A (ja) * 2012-08-09 2014-02-24 Ricoh Co Ltd 駆動伝達装置、画像形成装置

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019176871A1 (fr) * 2018-03-12 2019-09-19 日本精工株式会社 Joint pour transmission de couple et dispositif de direction assistée électrique
CN108945088A (zh) * 2018-06-20 2018-12-07 新乡艾迪威汽车科技有限公司 一种新型电动转向系统间隙补偿机构
CN108945088B (zh) * 2018-06-20 2023-07-25 豫北转向系统(新乡)股份有限公司 一种电动转向系统间隙补偿机构

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Publication number Publication date
JP6158448B2 (ja) 2017-07-05
JPWO2017010087A1 (ja) 2017-07-13

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