WO2013153586A1 - Mécanisme de transmission de rotation et dispositif de direction assistée électrique - Google Patents

Mécanisme de transmission de rotation et dispositif de direction assistée électrique Download PDF

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Publication number
WO2013153586A1
WO2013153586A1 PCT/JP2012/006753 JP2012006753W WO2013153586A1 WO 2013153586 A1 WO2013153586 A1 WO 2013153586A1 JP 2012006753 W JP2012006753 W JP 2012006753W WO 2013153586 A1 WO2013153586 A1 WO 2013153586A1
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WO
WIPO (PCT)
Prior art keywords
side shaft
torsion bar
input side
fitting
shaft
Prior art date
Application number
PCT/JP2012/006753
Other languages
English (en)
Japanese (ja)
Inventor
雄介 萬
康浩 岩崎
渡辺　靖
哲英 藤田
徹也 児玉
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 PCT/JP2013/002525 priority Critical patent/WO2013153826A1/fr
Priority to CN201380001637.6A priority patent/CN103597229B/zh
Priority to JP2014510062A priority patent/JP6201986B2/ja
Publication of WO2013153586A1 publication Critical patent/WO2013153586A1/fr

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Classifications

    • 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
    • F16D1/00—Couplings for rigidly connecting two coaxial shafts or other movable machine elements
    • F16D1/02—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for connecting two abutting shafts or the like
    • 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
    • F16D1/00—Couplings for rigidly connecting two coaxial shafts or other movable machine elements
    • F16D1/02—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for connecting two abutting shafts or the like
    • F16D1/027—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for connecting two abutting shafts or the like non-disconnectable, e.g. involving gluing, welding or the like
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
    • G01L3/02—Rotary-transmission dynamometers
    • G01L3/04—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft
    • G01L3/10—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electric or magnetic means for indicating
    • G01L3/101—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electric or magnetic means for indicating involving magnetic or electromagnetic means
    • G01L3/104—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electric or magnetic means for indicating involving magnetic or electromagnetic means involving permanent magnets
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
    • G01L5/22—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring the force applied to control members, e.g. control members of vehicles, triggers
    • G01L5/221—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring the force applied to control members, e.g. control members of vehicles, triggers to steering wheels, e.g. for power assisted steering
    • 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
    • F16D1/00—Couplings for rigidly connecting two coaxial shafts or other movable machine elements
    • F16D1/06—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end
    • F16D1/064—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end non-disconnectable
    • F16D1/072—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end non-disconnectable involving plastic deformation
    • 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
    • F16D1/00—Couplings for rigidly connecting two coaxial shafts or other movable machine elements
    • F16D1/06—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end
    • F16D1/08—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end with clamping hub; with hub and longitudinal key
    • F16D1/0894—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end with clamping hub; with hub and longitudinal key with other than axial keys, e.g. diametral pins, cotter pins and no other radial clamping

Definitions

  • the present invention relates to a shaft used for a rotation transmission mechanism, and more particularly to a steering main shaft of an electric power steering apparatus having a telescopic sliding part, an elliptical fitting part, a sensor for detecting an assist torque, and a mechanism for holding a torsion bar. It is.
  • a conventional electric power steering apparatus has, as described in, for example, Patent Document 1 below, a rigid structure in which an input side shaft connected to a steering wheel and an output side shaft connected to a steering gear mechanism such as a rack and pinion are rigid. It has a structure that connects with a low shaft (torsion bar).
  • a motor for assist torque is connected to the output shaft, the torsion amount of the torsion bar is detected by a torque sensor, the assist torque corresponding to the detected torsion amount of the torsion bar is calculated, and the assist torque is calculated by the motor. This reduces the driver's steering torque.
  • the torsion bar is fitted to both the input side shaft and the output side shaft, and the torque sensor for detecting the torsion amount of the torsion bar is fitted to the outer peripheral surface in the vicinity of the torsion bar fitting portion of the input side shaft.
  • the conventional input side shaft has an integral structure and is formed by forging and cutting.
  • the shaft on the input side of the rotation transmission mechanism requires drilling for fixing the torsion bar, but depending on the structure of the torque sensor, deep drilling is required, and it is difficult to guarantee the drilling accuracy. There is a case. Further, since the outer peripheral surface shape of the torsion bar fitting portion of the input side shaft is determined by the structure of the torque sensor to be fitted, the same structure can be used as long as the torque sensor is not changed. What varies depending on the vehicle (product type) is the length of the shaft, the length of the telescopic sliding portion, and the like. From the above, by dividing both parts, the torsion bar and the torque sensor fitting part are common regardless of the vehicle model, and only the other parts are produced exclusively for each type, and material and processing costs can be reduced. Become.
  • Patent Document 2 when connecting two axes arranged coaxially, a serration portion is formed on one shaft and a cylindrical portion is formed on the other shaft, and the serration portion is cured by heat treatment. A structure is shown in which the other side soft bite is bitten into the mating soft cylindrical part.
  • this structure there is a possibility of a cost increase because a heat treatment step that does not exist in the conventional step is included and there is a possibility of changing the material suitable for the heat treatment.
  • a rotation transmission mechanism is the rotation transmission mechanism in which a first rotation shaft and a second rotation shaft that are arranged coaxially are connected via a torsion bar.
  • the shaft is composed of a joint structure of each part divided into a common part that can be used in common with other kinds and a dedicated part of each kind. Further, it is desirable that the common part and the dedicated part are coupled by serration press-fitting. Moreover, it is desirable that the joint portion to be joined by the serration press-fit is not subjected to heat treatment. Further, it is desirable that a caulking portion is provided in the common portion or the exclusive portion, and the common portion and the exclusive portion are coupled by the caulking portion in addition to the serration press-fitting.
  • the electric power steering apparatus steers the input side shaft, the output side shaft connected to the input side shaft via a torsion bar, and the steering force input to the input side shaft.
  • the input side shaft is divided into a torsion bar fitting portion that can be used in common with other types and fitted with the torsion bar, and a connecting portion that is connected to the steering wheel as a dedicated part of each type. It is characterized by comprising a combined structure of each part.
  • the torsion bar fitting portion and the connecting portion are coupled by serration press-fitting.
  • a caulking portion is provided in the connecting portion, and the torsion bar fitting portion and the connecting portion are coupled by the caulking portion in addition to the serration press-fitting.
  • FIG. 1 is a cross-sectional view showing a main part of the rotation transmission mechanism according to the first embodiment of the present invention.
  • the rotation transmission mechanism of this embodiment is applied to, for example, the input side shaft 2 and the output side shaft 3 of an electric power steering device.
  • a steering wheel of the electric power steering device is integrally attached to the right end (not shown) of the input side shaft 2 in the rotational direction.
  • a pinion shaft constituting a rack and pinion type steering device of the electric power steering device is connected to a left end portion (not shown) of the output side shaft 3.
  • the input side shaft 2 is rotatably supported with respect to a housing (not shown) by a rolling bearing (not shown).
  • the output shaft 3 is rotatably supported by a rolling bearing 5b with respect to a housing (not shown).
  • the input side shaft 2 and the output side shaft 3 are respectively formed with cylindrical holes 2a and 3a concentric with the axial center.
  • the torsion bar 4 is inserted into the cylindrical holes 2 a and 3 a, and the input side shaft 2 and the output side shaft 3 are connected via the torsion bar 4.
  • communication holes 4a (the output side shaft side is not shown) extending in the radial direction are formed.
  • a communication hole having the same diameter as the communication hole 4a extends in the radial direction also on the input side shaft 2, and a communication hole having the same diameter as the communication hole 4a extends in the radial direction also on the output side shaft 3. Is formed.
  • a connecting pin (not shown) is inserted into the communicating hole 4a at one end of the torsion bar 4 and the communicating hole of the input side shaft 2 that correspond to each other, and the communicating hole at the other end of the torsion bar 4 that corresponds to each other.
  • a connecting pin (not shown) is inserted into the communication hole of the output side shaft 3. In this way, the input side shaft 2 and the torsion bar 4, and the torsion bar 4 and the output side shaft 3 are connected.
  • serrations are formed at both ends of the torsion bar 4 and are respectively press-fitted into the cylindrical hole 2a of the input side shaft 2 or the cylindrical hole 3a of the output side shaft 3, thereby connecting the both ends of the torsion bar 4 to the input side shaft.
  • the torsion bar 4 is coupled to the input side shaft 2 or the output side shaft 3 by a pin, and the other end portion of the torsion bar 4 is coupled to the output side shaft 3 or the input side shaft 2 by serration press-fitting. Also good.
  • the input side shaft 2 has a two-part structure. That is, the input side shaft 2 is connected to the torsion bar fitting portion 20a having a cylindrical hole 2a to be fitted to the torsion bar 4 (for example, a common part regardless of the type of vehicle on which the electric power steering device is mounted) and the steering wheel.
  • the connecting portion 20b (a dedicated portion that is not common depending on the vehicle model) is separated.
  • the torsion bar fitting portion 20a includes a large-diameter hole portion 21a that communicates with the cylindrical hole 2a and opens to the steering wheel side.
  • the large-diameter hole portion 21a includes, in the axial direction, a female serration portion 22a having a female serration on the inner peripheral surface and a thin-walled portion 23a having a reduced outer diameter and a reduced thickness in order from the left side in FIG. I have.
  • the connecting portion 20b is a columnar member.
  • the connecting portion 20b includes a male serration portion 21b, a reduced diameter portion 22b, and a cylindrical portion 23b in order from the left side of FIG. 1 in the axial direction.
  • the male serration portion 21b has substantially the same shape as the female serration portion 22a.
  • the reduced diameter portion 22b has an outer diameter slightly smaller than the outer diameter of the bottom of the serration groove of the male serration portion 21b.
  • the cylindrical portion 23b has a slightly larger outer diameter than the reduced diameter portion 22b in FIG. 1, it may have the same diameter as the reduced diameter portion 22b or a smaller diameter than the reduced diameter portion 22b.
  • the torsion bar fitting part 20a and the connecting part 20b are coupled by pressing the male serration part 21b into the female serration part 22a. Thereby, torque transmission without backlash becomes possible. As a result, since it is not necessary to bite one into the other as in the prior art, it is not necessary to heat treat the female serration portion 22a and the male serration portion 21b. Further, as a back-up of serration press-fitting between the torsion bar fitting portion 20a and the connecting portion 20b, the thin-walled portion 23a is crimped radially inward and brought into contact with the reduced diameter portion 22b.
  • the input side shaft 2 when the input side shaft 2 is formed as a separate body for the torsion bar fitting portion 20a and the connecting portion 20b, when the cylindrical hole 2a is formed, the input side shaft has a single structure. It is no longer necessary to machine a hole in a long rod-like member, the machining of the cylindrical hole 2a is simplified, and the machining accuracy is improved. Further, in forming the outer peripheral shape of the torsion bar fitting portion 20a, the restriction on the shape of the die due to die cutting is reduced as compared with the case where a long rod-like member is formed by forging. For this reason, the outer periphery shape of the torsion bar fitting part 20a can be formed with a forging die closer to the final shape. As a result, the material removed by cutting after forging is reduced, the material yield is improved, and the processing cost can be reduced.
  • the common part and the non-common part (dedicated part) depending on the type of vehicle on which the electric power steering device is mounted, so that the processing cost can be reduced.
  • the torsion bar fitting portion 20a and the connecting portion 20b are coupled by serration press-fitting, torque transmission without backlash is possible.
  • FIG. 2 is a cross-sectional view showing a main part of the electric power steering apparatus of the present embodiment.
  • the electric power steering apparatus of this embodiment shown in FIG. 2 has a configuration similar to the rotation transmission mechanism of the first embodiment. Therefore, the same reference numerals are given to the same components as those of the rotation transmission mechanism of the first embodiment.
  • the electric power steering apparatus according to the present embodiment includes in the housing 1 an input side shaft 2, an output side shaft 3, and a torque sensor 8 that detects a steering force input to the input side shaft as a steering torque.
  • the input side shaft 2 is rotatably supported with respect to the housing 1 by a rolling bearing (not shown).
  • the output side shaft 3 is rotatably supported with respect to the housing 1 by two rolling bearings 5a and 5b.
  • the input side shaft 2 and the output side shaft 3 are respectively formed with cylindrical holes 2a and 3a concentric with the axis center, as in the first embodiment.
  • the torsion bar 4 is inserted into the cylindrical holes 2 a and 3 a, and the input side shaft 2 and the output side shaft 3 are connected via the torsion bar 4.
  • communication holes 4a (the output side shaft side is not shown) extending in the radial direction are formed.
  • a communication hole having the same diameter as the communication hole 4a extends in the radial direction also on the input side shaft 2, and a communication hole having the same diameter as the communication hole 4a extends in the radial direction also on the output side shaft 3. Is formed.
  • connection pin (not shown) is inserted into the communication hole 4a at one end of the torsion bar 4 and the communication hole of the input side shaft 2 that correspond to each other, and the torsion corresponding to each other.
  • a connection pin (not shown) is inserted into the communication hole at the other end of the bar 4 and the communication hole of the output side shaft 3. In this way, the input side shaft 2 and the torsion bar 4, and the torsion bar 4 and the output side shaft 3 are connected.
  • serrations are formed at both ends of the torsion bar 4 and are respectively press-fitted into the cylindrical hole 2a of the input side shaft 2 or the cylindrical hole 3a of the output side shaft 3, thereby connecting the both ends of the torsion bar 4 to the input side shaft. 2 or the output side shaft 3 may be connected. Further, one end portion of the torsion bar 4 is coupled to the input side shaft 2 or the output side shaft 3 by a pin, and the other end portion of the torsion bar 4 is coupled to the output side shaft 3 or the input side shaft 2 by serration press-fitting. Also good.
  • a steering wheel is integrally mounted in the rotational direction on the right end side (not shown) of the input side shaft 2. Further, a pinion shaft constituting a known rack and pinion type steering device is connected to the left end of the output side shaft 3 via a universal joint, for example. Therefore, the steering force generated when the steering wheel steers the steering wheel is transmitted to the steered wheels via the input side shaft 2, the torsion bar 4, the output side shaft 3, the universal joint, and the rack and pinion type steering device. .
  • the output side shaft 3 is fitted with a worm wheel 9 that is coaxial with the output side shaft 3 and rotates integrally therewith.
  • a resin engagement portion 9a provided on the worm wheel 9 and a worm 10a formed on the outer peripheral surface of the output side shaft of the electric motor 10 are engaged with each other. Therefore, the rotational force of the electric motor is transmitted to the output side shaft 3 via the output side shaft, the worm and the worm wheel 9 of the electric motor 10.
  • steering assist torque in an arbitrary direction is applied to the output side shaft 3.
  • This steering assist torque is calculated from a value detected by a torque sensor 8 that detects a steering force transmitted to the input side shaft 2 via the steering wheel as a steering torque (and / or steering angle).
  • the torque sensor 8 is an electromagnetic induction type sensor, and includes a first sensor member 8a including a magnetic member such as a permanent magnet, and a second sensor member 8b including a member forming a magnetic circuit.
  • the first sensor member 8 a is fixed to the output side shaft 3, while the second sensor member 8 b is fixed to the input side shaft 2.
  • the steering torque (and / or steering angle) is detected by the relative angular displacement between the first sensor member 8a and the second sensor member 8b that is generated when the steering force is transmitted to the input side shaft 2.
  • the steering assist mechanism that applies the steering assist torque includes the torque sensor 8 and is included in the housing 1 together with the input side shaft 2 and the output side shaft 3.
  • the housing 1 includes an output side housing member 1a, a bearing supporting housing member 1c, and an input side housing member 1b.
  • the output side housing member 1a contains the output side shaft 3, the worm wheel 9, and the worm 10a, and supports the output side shaft 3 through a rolling bearing 5a so as to be rotatable.
  • the output side housing member 1a is formed of a metal material such as aluminum.
  • the input side housing member 1b contains the input side shaft 2 and a torque sensor.
  • the input side housing member 1b is also formed of a metal material such as aluminum.
  • the bearing supporting housing member 1c supports the rolling bearing 5b located closest to the torque sensor 8 among the rolling bearings 5a and 5b that support the output side shaft 3, and the rolling bearing 5b is interposed therebetween.
  • the output side shaft 3 is rotatably supported.
  • the outer periphery of the bearing supporting housing member 1c is provided with a large-diameter portion 11c that fits with the inner peripheral surface of the output-side housing member 1a and a small-diameter portion 12c that fits with the input-side housing member 1b.
  • the bearing supporting housing member 1c is fitted and fixed by press-fitting the large-diameter portion 11c into the inner peripheral surface of the output-side housing member 1a.
  • step-difference part 11a is provided in the axial direction end surface with which the large diameter part 11c is fitted of the output side housing member 1a.
  • the large diameter portion 11c of the bearing supporting housing member 1c is sandwiched between the stepped portion 11a and the end surface of the input side housing member 1b, and its axial position is restricted. Further, on the inner peripheral surface side of the bearing supporting housing member 1c, a fitting portion 13c that fits on the outer peripheral surface of the rolling bearing 5b and a step surface 14c that contacts one side surface in the axial direction of the rolling bearing 5b are formed. ing. The rolling bearing 5b is fitted and fixed to the bearing supporting housing member 1c by being press-fitted into the fitting portion 13c.
  • the bearing supporting housing member 1c is made of high-strength resin.
  • the high-strength resin include various engineering plastics, particularly polyamide resins and terephthalate resins.
  • As the high-strength resin it is preferable to use a terephthalate-based resin having a low water absorption rate and good dimensional stability at the time of water absorption among engineering plastics.
  • the terephthalate resins polybutylene terephthalate, polyethylene terephthalate, or a mixture thereof is more preferable.
  • a fiber reinforced resin to which a predetermined reinforcing agent or filler is added as the high strength resin.
  • the reinforcing agent include glass fiber and carbon fiber. Among these, glass fiber that does not relatively affect the detection of the electromagnetic induction sensor as the torque sensor 8 is preferable.
  • the bearing supporting housing member 1c By forming the bearing supporting housing member 1c from a high-strength resin as exemplified above, the bearing supporting housing member 1c can be made lighter than when the bearing supporting housing member 1c is formed from a metal material. As a result, in the electric power steering apparatus, the weight of the housing 1 itself can be reduced. Further, when the bearing supporting housing member 1c is formed of a metal material, finishing by cutting is necessary after forming by die casting, plastic working, etc., and the processing process becomes complicated. On the other hand, since the bearing supporting housing member 1c according to the present embodiment is formed of a high-strength resin, it can be processed with high accuracy only by molding by injection molding or the like.
  • the housing member 1c for supporting the rolling bearing 5b closest to the torque sensor 8 among the housing members 1a, 1c for supporting the rolling bearings 5a, 5b is replaced with a high-strength resin.
  • the torque sensor 8 is comprised with an electromagnetic induction type sensor.
  • the detection performance of the electromagnetic induction sensor is not affected by the bearing supporting housing member 1c.
  • the electromagnetic induction type sensor constituting the torque sensor 8 and the bearing supporting housing member 1c can be arranged close to each other. That is, when the bearing supporting housing member 1c is formed of a metal material, the axial distance A between the bearing supporting housing member 1c and the electromagnetic induction sensor affects the detection performance of the electromagnetic induction sensor.
  • the axial distance B may be a distance that does not affect the detection performance of the electromagnetic induction sensor.
  • the space volume in the housing 1 is the same, the degree of freedom in layout can be improved as compared with the case where the bearing supporting housing member 1c is formed of a metal material.
  • the electromagnetic induction sensor and the rolling bearing 5b can be arranged close to each other by the difference between the distances A and B, so the axial dimension of the output shaft 3 can be reduced. it can. As a result, the collapse stroke of the steering column can be extended.
  • the bearing supporting housing member 1c is formed of high-strength resin, the bearing supporting housing member 1c and the electromagnetic induction sensor constituting the torque sensor 8 can be brought into contact with each other. That is, when the bearing supporting housing member 1c is formed of a metal material, the distance A between the bearing supporting housing member 1c and the electromagnetic induction sensor is a distance that does not affect the detection performance of the electromagnetic induction sensor. It was necessary to. Therefore, it is necessary to use a non-metallic member, mainly a resin member, between the sensor body and the bearing supporting housing member 1c (metal) in order to hold the sensor detection unit itself, and as a result, the layout around the sensor is limited. It had been.
  • the bearing supporting housing member 1c is formed of a high-strength resin, the bearing supporting housing member 1c directly holds the sensor itself or the non-metallic member is reduced. As a result, the degree of freedom of layout around the sensor can be secured.
  • the electromagnetic induction type sensor is provided with a convex portion, and the bearing supporting housing member 1c is engaged with the convex portion. You may provide the recessed part to do. By engaging the convex portion and the concave portion, the electromagnetic induction sensor can be prevented from rotating.
  • the input shaft 2 has a two-part structure. That is, the input side shaft 2 is connected to a torsion bar fitting portion 20a (a common portion regardless of the type of vehicle on which the electric power steering device is mounted) having a cylindrical hole 2a to be fitted to the torsion bar 4 and a steering wheel.
  • the part 20b (a dedicated part that is not common depending on the vehicle model) is separated.
  • the torsion bar fitting portion 20a includes a large-diameter hole portion 21a that communicates with the cylindrical hole 2a and opens to the steering wheel side.
  • the large-diameter hole portion 21a includes, in the axial direction, a female serration portion 22a having a female serration on the inner peripheral surface, and a thin-wall portion 23a having a reduced outer diameter and a reduced thickness in order from the left side in FIG. I have.
  • the connecting portion 20b is a columnar member.
  • the connecting portion 20b includes a male serration portion 21b, a reduced diameter portion 22b, and a cylindrical portion 23b in order from the left side of FIG. 2 in the axial direction.
  • the male serration portion 21b has substantially the same shape as the female serration portion 22a.
  • the reduced diameter portion 22b has an outer diameter slightly smaller than the outer diameter of the bottom of the serration groove of the male serration portion 21b.
  • the cylindrical portion 23b has an outer diameter slightly larger than the reduced diameter portion 22b in FIG. 2, but may have the same diameter as the reduced diameter portion 22b or a smaller diameter than the reduced diameter portion 22b.
  • the torsion bar fitting portion 20a and the connecting portion 20b are coupled by pressing the male serration portion 21b into the female serration portion 22a.
  • torque transmission without backlash becomes possible.
  • the thin-walled portion 23a is crimped radially inward and brought into contact with the reduced diameter portion 22b.
  • the input side shaft 2 is separated into the torsion bar fitting portion 20a and the connecting portion 20b, when the cylindrical hole 2a is formed as in the first embodiment, the input side shaft 2 is There is no need to drill a long rod-like member as in the case where the shaft has an integral structure, the machining of the cylindrical hole 2a is simplified, and the machining accuracy is improved.
  • the restriction on the shape of the die due to die cutting is reduced as compared with the case where a long rod-like member is formed by forging. For this reason, the outer periphery shape of the torsion bar fitting part 20a can be formed with a forging die closer to the final shape. As a result, the material removed by cutting after forging is reduced, the material yield is improved, and the processing cost can be reduced.
  • the common part and the non-common part (dedicated part) depending on the type of vehicle on which the electric power steering device is mounted, so that the processing cost can be reduced.
  • the torsion bar fitting portion 20a and the connecting portion 20b are coupled by serration press-fitting, torque transmission without backlash is possible.
  • the present invention is applied to the electric power steering apparatus.
  • the present invention can be applied to all rotation transmission mechanisms.
  • it can be applied to those that require precision cutting deep inside the shaft.
  • it is applicable to those that can reduce machining costs by making one part common and adjusting the other according to the specifications. Is possible.
  • the present invention is applied to the input shaft.
  • the present invention can be applied to output or applied to both the input shaft and the output shaft.

Abstract

　L'invention concerne un dispositif de direction assistée électrique et un mécanisme de transmission de rotation ayant une structure divisée et permettant une réduction des coûts de traitement. Par exemple, lors de la liaison, au moyen d'une barre de torsion (4), d'un arbre côté entrée (premier arbre rotatif) (2) et d'un arbre côté sortie (second arbre rotatif) (3), positionné sur le même axe dans un dispositif de direction assistée électrique, l'arbre côté entrée (2) est configuré sous la forme d'une structure de liaison à plusieurs parties qui est divisée en une section d'interverrouillage de barre de torsion (20a) qui est une partie commune qui peut être utilisée communément dans différents produits, et une section de liaison (20b) qui est une partie spécifique pour un produit spécifique. La section d'interverrouillage de barre de torsion (20a) et la section de liaison (20b) sont jointes au moyen d'un emmanchement à force à dentelure ; et une section à paroi mince (23a), qui sert de section de sertissage, est prévue sur la section d'interverrouillage de barre de torsion (20a) (ou la section de liaison (20b)), la section à paroi mince (23a) étant sertie sur la section de liaison (20b) (ou la section d'interverrouillage de barre de torsion (20a)) et servant comme un auxiliaire pour l'emmanchement à force à dentelure.
PCT/JP2012/006753 2012-04-13 2012-10-22 Mécanisme de transmission de rotation et dispositif de direction assistée électrique WO2013153586A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
PCT/JP2013/002525 WO2013153826A1 (fr) 2012-04-13 2013-04-12 Mécanisme de transmission de rotation et dispositif de direction assistée électrique
CN201380001637.6A CN103597229B (zh) 2012-04-13 2013-04-12 旋转传递机构和电动助力转向装置
JP2014510062A JP6201986B2 (ja) 2012-04-13 2013-04-12 回転伝達機構及び電動パワーステアリング装置

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2012-092145 2012-04-13
JP2012092145 2012-04-13
JP2012178041 2012-08-10
JP2012-178041 2012-08-10

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EP3081458B1 (fr) * 2014-03-05 2018-12-26 NSK Ltd. Dispositif de direction assistée électrique et procédé pour son assemblage
GB2524758B (en) * 2014-04-01 2016-12-14 Jaguar Land Rover Ltd Rotating shaft coupling
DE102014116195A1 (de) * 2014-11-06 2016-05-12 Thyssenkrupp Presta Teccenter Ag Nockenwelle mit wenigstens einem axial fixierten Schiebeelement
JP6519452B2 (ja) * 2015-11-11 2019-05-29 日本精工株式会社 ヨークカバー、トルク検出装置及び電動パワーステアリング装置、並びにヨークカバーの製造方法及び電動パワーステアリング装置の製造方法
CN108349527B (zh) * 2015-11-13 2020-03-06 日本精工株式会社 电动式助力转向装置及其组装方法
JP6893420B2 (ja) * 2017-02-06 2021-06-23 株式会社山田製作所 シャフトとヨークの組立体
DE102018206536A1 (de) * 2018-04-27 2019-10-31 Bayerische Motoren Werke Aktiengesellschaft Verfahren zum Herstellen einer Welle-Nabeverbindung und Kraftfahrzeugwelle mit einer solchen Verbindung
US11722035B2 (en) * 2018-09-12 2023-08-08 Nsk Ltd. Electric motor with reverse input cutoff clutch
CN112455530B (zh) * 2019-09-06 2022-06-10 比亚迪股份有限公司 角传动装置、转向系统及车辆

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WO2013153826A1 (fr) 2013-10-17
CN103597229A (zh) 2014-02-19
CN103597229B (zh) 2016-05-25
JPWO2013153826A1 (ja) 2015-12-17
JP6201986B2 (ja) 2017-09-27

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