WO2019054095A1 - Dispositif de direction assistée - Google Patents

Dispositif de direction assistée Download PDF

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Publication number
WO2019054095A1
WO2019054095A1 PCT/JP2018/029706 JP2018029706W WO2019054095A1 WO 2019054095 A1 WO2019054095 A1 WO 2019054095A1 JP 2018029706 W JP2018029706 W JP 2018029706W WO 2019054095 A1 WO2019054095 A1 WO 2019054095A1
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WO
WIPO (PCT)
Prior art keywords
pinion shaft
elastic member
shaft
power steering
base
Prior art date
Application number
PCT/JP2018/029706
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English (en)
Japanese (ja)
Inventor
起翔 王
Original Assignee
日立オートモティブシステムズ株式会社
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Filing date
Publication date
Application filed by 日立オートモティブシステムズ株式会社 filed Critical 日立オートモティブシステムズ株式会社
Publication of WO2019054095A1 publication Critical patent/WO2019054095A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D5/00—Power-assisted or power-driven steering
    • B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear

Definitions

  • the present invention relates to a power steering apparatus used in a vehicle.
  • Patent Document 1 As a conventional power steering apparatus, for example, a technology described in Patent Document 1 has been proposed.
  • Patent Document 1 discloses a technique in which a worm shaft that meshes with a worm wheel is provided on an output shaft of an electric motor, and the driving force of the electric motor is transmitted from the worm wheel to the rack bar via a second pinion.
  • an object of the present invention is to provide a power steering apparatus which solves the above-mentioned problems and improves the steering feeling in the area where the rotation of the electric motor has not started.
  • a first pinion shaft comprising a first pinion tooth engaged with a first rack tooth formed on the rack bar and a first pinion shaft connected to the steering wheel, and a second formed on the rack bar
  • a second pinion shaft having a second pinion tooth meshing with the rack tooth and connected to the worm wheel, provided between an engagement portion of the second rack tooth and the second pinion tooth and the worm wheel, and
  • An elastic member is provided which enables relative rotation of the second pinion shaft and the worm wheel in the rotation axis.
  • FIG. 1 is an overall configuration diagram of a power steering apparatus according to a first embodiment. It is a principal part enlarged view of the power steering device concerning a 1st example. It is a figure which shows the state which removed each housing in FIG. It is a perspective view showing the reduction gear mechanism concerning the 1st example. It is a longitudinal cross-sectional view of the assist system structure part shown in FIG. It is a principal part perspective view of the 2nd pinion shaft concerning a 1st example. It is the perspective view which looked at the shaft part from the worm wheel side. It is principal part sectional drawing of the worm wheel which concerns on 1st Example, and a 2nd pinion shaft. It is principal part sectional drawing of the worm wheel and 2nd pinion shaft which concern on 2nd Example.
  • FIG. 1 is an entire configuration diagram of a power steering apparatus 100 according to a first embodiment of the present invention.
  • a steering input to the steering wheel 101 by the driver is transmitted to the first pinion shaft 104 via the column shaft 102 and the intermediate shaft 103 as a rotational movement, and is a rack having first rack teeth 105 b meshing with the first pinion shaft 104
  • the bar 105 converts it into linear motion.
  • the linear motion of the rack bar 105 is transmitted to the steered wheels 107 via the tie rods 106.
  • the rack bar 105 includes a rack bar main body portion 105a, first rack teeth 105b, and second rack teeth 105c.
  • the first rack teeth 105b are provided on the rack bar main body portion 105a, and the second rack teeth 105c are provided at positions separated from the first rack teeth 105b in the longitudinal direction of the rack bar 105.
  • the first pinion shaft 104 includes a first pinion shaft main body portion 104 a and first pinion teeth 104 b, and the first pinion shaft main body portion 104 a is rotatable with the rotation of the steering wheel 101.
  • the first pinion teeth 104b are provided on the first pinion shaft main portion 104a and mesh with the first rack teeth 105b.
  • the steering mechanism includes the column shaft 102, the intermediate shaft 103, the first pinion shaft 104, the rack bar 105, and the tie rods 106, and the rotation of the steering wheel 101 is transmitted to the steered wheels 107.
  • the rotational force of the electric motor 108 is applied to the worm shaft 109 and transmitted to the second pinion shaft 111 via the worm wheel 110 meshing with the worm shaft 109.
  • the reduction gear is composed of the worm shaft 109 and the worm wheel 110.
  • the second pinion shaft 111 includes a second pinion shaft main body portion 111 a and second pinion teeth 111 b.
  • the second pinion teeth 111b are provided on the second pinion shaft main portion 111a and mesh with the second rack teeth 105c.
  • the second pinion shaft 111 is connected to the worm wheel 110, and the worm wheel 110 rotates with the rotation of the second pinion shaft 111.
  • the electric motor 108 is, for example, a three-phase brushless motor, and applies a steering force to the steering mechanism.
  • the column shaft 102 is provided with a steering angle sensor 112 for detecting a steering angle of the steering wheel 101, and a torque sensor 113 for detecting a steering torque is provided between the column shaft 102 and the intermediate shaft 103. . Further, a motor rotation angle sensor 114 for detecting the rotation angle of the electric motor 108 is provided on the output shaft of the electric motor 108. The output of each sensor is input to the electronic control unit 115.
  • the electronic control unit 115 has an absolute angle calculation unit 115 a and a motor drive unit 115 b.
  • the absolute angle calculator 115a calculates the absolute angle of the steering wheel 101 from the steering angle and the motor rotation angle.
  • the motor drive unit 115b controls the current value of the electric motor 108 based on the operating conditions such as the steering torque, the absolute angle of the steering wheel 101, and the vehicle speed, and controls the steering force applied to the steering mechanism.
  • FIG. 2 is an enlarged view of an essential part of the power steering apparatus 100 according to the first embodiment
  • FIG. 3 is a view showing a state in which the respective housings 117 and 118 are removed in FIG.
  • the rack bar 105 is accommodated in the rack housing 116.
  • the steering angle sensor 112, the torque sensor 113 and the first pinion shaft 104 are accommodated in a first gear housing 117.
  • the worm shaft 109, the worm wheel 110 and the second pinion shaft 111 are accommodated in a second gear housing 118.
  • the first gear housing 117 and the second gear housing 118 are fixed to the rack housing 116.
  • the inside of the second gear housing 118 is filled with lubricating grease.
  • Each device accommodated in the second gear housing 118 constitutes an assist system mechanism unit 120.
  • FIG. 4 is a perspective view showing the speed reduction mechanism according to the first embodiment.
  • the worm shaft 109 is rotatably supported at its both ends by a first ball bearing 121 and a second ball bearing 122 with respect to a second gear housing 118 (see FIG. 2).
  • the second ball bearing 122 is provided with a backlash adjustment mechanism 123.
  • a tooth portion 110a that meshes with the screw thread 109a of the worm shaft 109 is formed.
  • the worm shaft 109 is provided with a connection portion 124 connected to the electric motor 108.
  • the backlash adjustment mechanism 123 arranges the rubber ring 123a on the second ball bearing 122, and biases the second ball bearing 122 toward the worm wheel 110 by the rubber ring 123a, whereby the worm shaft 109 and the worm wheel 110 are obtained. It adjusts the gap (backlash) in the meshing of the teeth.
  • FIG. 5 is a longitudinal sectional view of the assist system component shown in FIG.
  • the assist system mechanical unit 120 includes an electric motor 108 that generates a steering assist force according to the driver's steering force, a worm shaft 109 connected to a drive shaft of the electric motor 108, and a thread 109a of the worm shaft 109. It comprises a worm wheel 110 that meshes and a second pinion shaft 111 connected to the worm wheel 110.
  • the worm wheel 110 includes a metal base 110b made of metal and a resin tooth 110a (resin tooth) provided on the outer periphery of the metal base 110b. Further, a through hole 110c is formed in the metal base portion 110b of the worm wheel 110, and the second pinion shaft 111 is fixed by pressing the second pinion shaft 111 into the through hole 110c. It is done.
  • the second pinion teeth 111 b formed on the second pinion shaft 111 mesh with the second rack teeth 105 c formed on the rack bar 105.
  • the rack bar 105 is biased toward the second pinion shaft 111 by a coil spring 125.
  • FIG. 6 is a perspective view of an essential part of the second pinion shaft 111 according to the first embodiment of the present invention.
  • FIG. 7 is a perspective view of the shaft portion as viewed from the worm wheel side.
  • FIG. 8 is a sectional view of an essential part of the worm wheel and the second pinion shaft 111 according to the first embodiment of the present invention.
  • the second pinion shaft 111 has an elastic member base 204 forming an elastic member 200 press-fit and connected to the through hole 110c of the worm wheel 110 (metal base 110b), and a shaft portion on which the second pinion teeth 111b are formed. 300 are provided.
  • the second pinion shaft main body portion 111 a (see FIG. 3) is mainly configured of an elastic member 200 and a shaft portion 300.
  • the elastic member 200 is composed of a torsion bar 202 and an elastic member base 204.
  • the elastic member base 204 is formed in a circular shape, but the cross-sectional shape may be an ellipse, a square, or a triangle.
  • the elastic member base 204 is provided with a base side rotation restricting portion 201.
  • the torsion bar 202 is provided with a torsion portion 202a and a torsion bar fixing portion 202b.
  • the outer diameter of the torsion portion 202a is smaller than the outer diameter of the torsion bar fixing portion 202b.
  • the torsion bar 202 is provided on the second pinion shaft 111.
  • the shaft portion 300 (second pinion shaft 111) is provided with a shaft side rotation restricting portion 301 which abuts on the base side rotation restricting portion 201, a shaft side fixing portion 302, and a torsion removing portion 303.
  • the torsion removing portion 303 is formed such that the outer diameter of the second pinion shaft 111 with respect to the rotation axis is larger than the outer diameter of the shaft side fixing portion 302. That is, a gap is formed between the torsion removing portion 303 and the outer periphery of the torsion portion 202a.
  • the base side rotation restricting portion 201 and the shaft side rotation restricting portion 301 are shaped so as to engage with each other. That is, in the radial direction of the rotation axis of the second pinion shaft 111, the base-side rotation restricting portion 201 which is a side surface of a portion protruding radially outward from the rotation axis center, and radially inward from the rotation axis center.
  • the shaft side rotation restricting portion 301 which is a side surface of the protruding portion abuts, and the second pinion shaft 111 rotates.
  • the shaft side rotation restricting portion 301 is formed larger than the base side rotation restricting portion 201. That is, a play (a gap) is provided between the shaft side rotation restricting portion 301 and the base side rotation restricting portion 201.
  • the elastic member base 204 is provided with a base-side collapse restricting portion 210.
  • the shaft side fall restricting portion 310 is also provided in the shaft portion 300 (second pinion shaft 111). The base-side falling restricting portion 210 and the shaft-side falling restricting portion 310 are used to prevent the torsion bar 202 from falling more than a predetermined amount.
  • the base-side collapse restricting portion 210 and the shaft-side fall restricting portion 310 are concavo-convex surfaces formed in the radial direction of the rotation axis of the second pinion shaft 111.
  • the base-side collapse restricting portion 210 and the shaft-side fall restricting portion 310 can prevent the torsion bar 202 from collapsing more than a predetermined amount when the surfaces thereof abut on each other.
  • the shaft portion 300 is formed with a through hole 304 penetrating from one side surface to the other side surface.
  • a through hole 203 penetrating from one side surface to the other side surface is formed.
  • the torsion bar fixing portion 202b is inserted into the shaft side fixing portion 302, and the fixing pin 305 is inserted into the through hole 304 at a position where the through hole 203 of the torsion bar fixing portion 202b matches the through hole 304 of the shaft side fixing portion 302. It inserts in the through hole 203.
  • the torsion bar fixing portion 202b and the shaft side fixing portion 302 are connected and fixed.
  • fixation of the torsion bar 202 and the shaft part 300 is not limited to the method of using the fixing pin 305.
  • FIG. the torsion bar fixing portion 202b may be press-fitted and fixed to the shaft side fixing portion 302.
  • the first pinion shaft 104 rotates and the rack bar 105 starts to move.
  • the second pinion shaft 111 engaged with the second rack teeth 105c is rotated.
  • the shaft portion 300 rotates on the second pinion shaft 111, and the rotational force is transmitted to the torsion bar 202.
  • the torsion bar 202 is provided with a torsion portion 202a, and the torsion portion 202a is twisted by the rotational force received by the torsion bar fixing portion 202b. Since a gap is formed between the torsion removing portion 303 and the outer periphery of the torsion portion 202a, when the torsion portion 202a is twisted, the torsion portion 202a does not contact the torsion removing portion 303, and the torsion portion 202a is twisted. It does not affect
  • the second pinion shaft 111 is provided with the shaft side rotation restricting portion 301 which restricts twisting of the elastic member 200 by more than a predetermined angle by coming into contact with the base side rotation restricting portion 201, the predetermined angle of the torsion bar 202 By restricting the above twisting, damage to the torsion bar 202 can be suppressed.
  • the elastic member 200 is provided between the mesh wheel 110 and the meshing portion between the second rack teeth 105 c and the second pinion teeth 111 b, and the second pinion shaft 111 along the rotation axis of the second pinion shaft 111.
  • the relative rotation of the worm wheel 110 is enabled.
  • the steering feeling can be improved in the region where the rotation of the electric motor 108 has not started.
  • the elastic member 200 is provided on the second pinion shaft 111, manufacturability is better than when the elastic member 200 is provided integrally on the worm wheel 110 or the pinion gear.
  • the torsion bar 202 is provided as the elastic member 200. For this reason, even before the rotation of the electric motor 108, the second pinion shaft 111 can be rotated by following the movement of the rack bar 105, thereby suppressing the feeling of the start of the steering wheel 101 being pulled. it can.
  • the torsion element on the side of the second pinion shaft 111 has the same type as that on the side of the first pinion shaft 104, so the steering feeling differs. It is possible to suppress an increase in incongruity caused by mixing of different types of twisting elements.
  • the worm wheel 110 is composed of a metal base 110b made of metal and a resin tooth 110a (resin tooth) provided on the outer periphery of the metal base 110b. .
  • a high coupling force can be obtained between the metal base 110 b and the torsion bar 202.
  • the metal base 110b has an outer diameter larger than that of the torsion bar 202, it is possible to suppress an increase in the surface pressure of the inner peripheral surface of the resin tooth 110a.
  • FIG. 9 is a sectional view of an essential part of a worm wheel 110 and a second pinion shaft 111 according to a second embodiment of the present invention.
  • the difference from the first embodiment is the configuration of the elastic member 200.
  • the same reference numerals as in the first embodiment denote the same parts as in the first embodiment.
  • an elastic member base 204 is press-fitted and fixed to the through hole 110c of the worm wheel 110 (metal base 110b).
  • a through hole 204 a is formed in the elastic member base 204 in the rotational axis direction of the second pinion shaft 111.
  • the torsion bar fixing portion 202c is provided on the torsion bar 202, and the elastic member base 204 and the torsion bar 202 are fixed by press-fitting the torsion bar fixing portion 202c into the through hole 204a of the elastic member base 204.
  • the elastic member 200 is configured by integrating the elastic member base 204 and the torsion bar 202.
  • the elastic member base 204 is provided between the worm wheel 110 and the torsion bar 202.
  • the torsion bar 202 is provided so as to overlap the worm wheel 110 in the direction of the rotation axis of the second pinion shaft 111.
  • the axial length of the torsion bar 202 can be increased while suppressing increase in the axial dimension of the device, and the rigidity of the torsion bar 202 is reduced. can do. Therefore, the effect of the torsion bar 202 can be obtained even for the movement of the smaller rack bar 105.
  • the elastic member base 204 is provided with the base-side tilt restriction portion 210.
  • the shaft portion 300 (second pinion shaft 111) is provided with a shaft-side tilt restriction portion 310.
  • the base-side falling restricting portion 210 and the shaft-side falling restricting portion 310 are used to prevent the torsion bar 202 from falling more than a predetermined amount.
  • the base-side collapse restricting portion 210 and the shaft-side fall restricting portion 310 are concavo-convex surfaces formed in the radial direction of the rotation axis of the second pinion shaft 111.
  • the torsion bar 202 can be prevented from falling more than a predetermined amount.
  • the axial center misalignment of the worm wheel 110 and the second pinion shaft 111 caused by the tilting of the torsion bar 202 can be suppressed by suppressing the tilting of the torsion bar 202 by a predetermined amount or more. As a result, smooth rotation of both members can be obtained.
  • the base-side collapse restricting portion 210 includes a base-side rotation restricting portion 201 formed integrally with the base-side collapse restricting portion 210.
  • the second pinion shaft 111 is provided with a shaft side rotation restricting portion 301 which is integrally formed with the shaft side inclination restricting portion 310.
  • the shaft side rotation restricting portion 301 restricts twisting of the elastic member 200 by a predetermined angle or more by coming into contact with the base side rotation restricting portion 201.
  • the movement of the rack bar 105 can be followed to rotate the second pinion shaft 111, and the feeling of the start of turning of the steering wheel 101 can be felt. Can be suppressed.
  • the rotation restricting portion and the tilt restricting portion are integrally formed, the axial dimension of the device can be reduced as compared with the case where both are arranged in series in the axial direction. be able to.
  • FIG. 10 is an external perspective view of an elastic member 200 according to a third embodiment of the present invention.
  • FIG. 11 is a cross-sectional view of a worm wheel and a second pinion shaft according to a third embodiment of the present invention.
  • the difference from the second embodiment is the configuration of the base side rotation restricting portion 201.
  • the same reference numerals as in the second embodiment denote the same parts as in the second embodiment.
  • the shaft side rotation restricting portion 301 abuts on the base side rotation restricting portion 201, and the twisting is restricted. At this time, the shaft side rotation restricting portion 301 and the base side rotation restricting portion 201 collide with each other and there is a possibility that rattle may occur in both members.
  • the elastic member base 204 of the elastic member 200 is formed with a base side rotation restricting portion 201 a and a base side rotation restricting portion 201 b in the rotational axis direction of the second pinion shaft 111.
  • the distance from the base-side rotation restricting portion 201b to the outermost periphery of the second pinion shaft 111 from the rotation axis toward the radially outer side is shorter than that of the base-side rotation restricting portion 201a.
  • a buffer member 220 is provided at a portion of the base side rotation restricting portion 201b.
  • the buffer member 220 is formed of an elastic material such as rubber.
  • the buffer member 220 is provided between the base side rotation restricting portion 201 b and the shaft side rotation restricting portion 301 of the second pinion shaft 111.
  • the first pinion shaft 104 rotates and the rack bar 105 starts to move.
  • the second pinion shaft 111 engaged with the second rack teeth 105c is rotated.
  • the shaft portion 300 rotates on the second pinion shaft 111, and the rotational force is transmitted to the torsion bar 202.
  • the torsion bar 202 is provided with a torsion portion 202a, and the torsion portion 202a is twisted by the rotational force received by the torsion bar fixing portion 202b. Since the shock absorbing member 220 is provided between the shaft side rotation restricting portion 301 and the base side rotation restricting portion 201, the shock absorbing member 220 is crushed by the rotational force received by the torsion bar fixing portion 202b, and the rotational force is immediately reduced. It is not transmitted to the base side rotation restricting portion 201.
  • the buffer member 220 suppresses the collision of the base side rotation restricting portion 201b and the shaft side rotation restricting portion 301, and can suppress rattling of both members.
  • FIG. 12 is an external perspective view of a worm wheel 110 and a second pinion shaft 111 according to a fourth embodiment of the present invention.
  • FIG. 13 is a cross-sectional view of a worm wheel 110 and a second pinion shaft 111 according to a fourth embodiment of the present invention.
  • a torsion portion 202a is integrally formed on the elastic member base 204b.
  • the elastic member base 204 b and the torsion portion 202 a are both formed of metal.
  • the worm wheel 110 is formed of a resin material, and the elastic member base 204 b is molded and integrated with the resin material forming the worm wheel 110.
  • the worm wheel 110 is recessed in the rotational axis direction of the second pinion shaft 111, and a base-side rotation restricting portion 201a and a base-side tilt restricting portion 210 are formed in this recessed portion.
  • a shaft side rotation restricting portion 301a and a shaft side collapse restricting portion 310a are formed in the shaft portion 300 (second pinion shaft 111).
  • the shaft side rotation restricting portion 301 a and the shaft side inclination restricting portion 310 a are formed radially outward of the rotation axis of the second pinion shaft 111.
  • the torsion bar fixing portion 202b of the torsion bar 202 is inserted into the shaft side fixing portion 302 of the second pinion shaft 111, and the through hole 203 of the torsion bar fixing portion 202b and the shaft
  • the fixing pin 305 is inserted into the through hole 304 and the through hole 203 at a position where the through hole 304 of the side fixing portion 302 is aligned.
  • the shaft-side rotation restriction portion 301a and the shaft-side fall restriction portion 310a of the shaft portion 300 are inserted into the hollow portion of the worm wheel 110, and the base side rotation restriction portion 201a formed in the hollow portion It meshes with the base side fall control part 210.
  • the base-side rotation restricting portion 201a and the base-side falling restricting portion 210 formed in the recessed portion are formed larger than the shaft-side rotation restricting portion 301a and the shaft-side falling restricting portion 310a. That is, a play (a gap) is provided between the base side rotation restricting portion 201a (the base side collapse restricting portion 210) and the shaft side rotation restricting portion 301a (the shaft side collapse restricting portion 310a).
  • the fourth embodiment it is possible to suppress an increase in the number of parts as compared to the case where the worm wheel 110 has the metal base 110b.
  • the axial center misalignment of the worm wheel 110 and the second pinion shaft 111 accompanying the tilting of the torsion bar 202 can be suppressed by suppressing the tilting of the torsion bar 202 by a predetermined amount or more. .
  • smooth rotation of both members can be obtained.
  • FIG. 14 is an external perspective view of a worm wheel 110 and a second pinion shaft 111 according to a fifth embodiment of the present invention.
  • FIG. 15 is a cross-sectional view of a worm wheel 110 and a second pinion shaft 111 according to a fifth embodiment of the present invention.
  • the worm wheel 110 is formed of a resin material, and a through hole 110 c is formed.
  • a metal elastic member base 204 formed of metal is inserted into the through hole 110 c and molded and integrated with a resin worm wheel 110.
  • the elastic member base 204 is recessed in the rotational axis direction of the second pinion shaft 111, and a base-side rotation restricting portion 201a and a base-side falling restricting portion 210 are formed in this recessed portion.
  • a through hole 204 a is formed in the elastic member base 204 in the rotational axis direction of the second pinion shaft 111.
  • the torsion bar fixing portion 202c is provided on the torsion bar 202, and the elastic member base 204 and the torsion bar 202 are fixed by pressing the torsion bar fixing portion 202c into the through hole 204a of the elastic member base 204.
  • the elastic member 200 is configured by integrating the elastic member base 204 and the torsion bar 202.
  • the elastic member base 204 is provided between the worm wheel 110 and the torsion bar 202.
  • the torsion bar 202 is provided so as to overlap the worm wheel 110 in the direction of the rotation axis of the second pinion shaft 111.
  • the axial length of the torsion bar 202 can be increased while suppressing the increase in the axial dimension of the device, and the rigidity of the torsion bar 202 is reduced. can do. Therefore, the effect of the torsion bar 202 can be obtained even for the movement of the smaller rack bar 105.
  • a shaft side rotation restricting portion 301a and a shaft side collapse restricting portion 310a are formed in the shaft portion 300 (second pinion shaft 111).
  • the shaft side rotation restricting portion 301 a and the shaft side inclination restricting portion 310 a are formed radially outward of the rotation axis of the second pinion shaft 111.
  • the fixing of the worm wheel 110 and the second pinion shaft 111 is the same as in the fourth embodiment.
  • damage to the torsion bar 202 can be suppressed by restricting twisting of the torsion bar 202 at a predetermined angle or more.
  • the fifth embodiment it is possible to suppress axial misalignment of the worm wheel 110 and the second pinion shaft 111 caused by the tilting of the torsion bar 202 by suppressing the tilting of the torsion bar 202 by a predetermined amount or more. . As a result, smooth rotation of both members can be obtained.
  • FIG. 16 is an external perspective view of a worm wheel 110 and a second pinion shaft 111 according to a sixth embodiment of the present invention.
  • FIG. 17 is a view of the second pinion shaft 111 according to the sixth embodiment of the present invention as viewed from the rotational axis direction.
  • a through hole 110 c is formed in the worm wheel 110, and the elastic member base 204 is inserted.
  • the elastic member base 204 is press-fitted and fixed to the worm wheel 110.
  • the elastic member base 204 is formed with a flat base-side rotation restricting portion 201 extending in the rotational axis direction of the second pinion shaft 111. Further, in the base side rotation restricting portion 201, a through hole 230 formed in the radial direction of the rotation axis of the second pinion shaft 111 is formed.
  • a flat shaft side rotation restricting portion 301 extending in the rotation axis direction of the second pinion shaft 111 and a radial direction of the rotation axis of the second pinion shaft 111.
  • An extending first insertion groove 330 and a second insertion groove 331 are formed.
  • the elastic member base 204 and the shaft portion 300 (second pinion shaft 111) are connected by an elastic member 400.
  • the elastic member 400 has a plate spring and has a first bending portion 401 and a second bending portion 402.
  • the elastic member 400 is inserted in a state in which the through hole 230 formed in the elastic member base 204, the first insertion groove 330 formed in the shaft portion 300 (the second pinion shaft 111), and the second insertion groove 331 coincide with each other. Ru.
  • the inside of the first insertion groove 330 and the inside of the second insertion groove 331 are respectively A first bending portion 401 and a second bending portion 402 are provided.
  • the first bent portion 401 and the second bent portion 402 are compressible in the circumferential direction of the rotation axis of the second pinion shaft 111.
  • the first pinion shaft 104 rotates and the rack bar 105 starts to move.
  • the second pinion shaft 111 engaged with the second rack teeth 105c is rotated.
  • the shaft portion 300 rotates on the second pinion shaft 111, and the rotational force is transmitted to the elastic member 400.
  • the elastic member 400 is provided with a first bending portion 401 and a second bending portion 402 accommodated in the first insertion groove 330 and the second insertion groove 331, and the first force is received by the rotational force received by the shaft portion 300.
  • the first bent portion 401 and the second bent portion 402 are compressed in the insertion groove 330 and the second insertion groove 331 to absorb the rotational force. Since a gap is formed between the base side rotation restricting portion 201 and the shaft side rotation restricting portion 301, the rotational force received by the shaft portion 300 is not immediately transmitted to the shaft side rotation restricting portion 301.
  • the shaft side rotation restricting portion 301 abuts on the base side rotation restricting portion 201, and the compression is restricted.
  • the second pinion shaft 111 is provided with the shaft side rotation restricting portion 301 which restricts the compression of the elastic member 400 by a predetermined angle or more by coming into contact with the base side rotation restricting portion 201, the predetermined angle of the elastic member 400 By restricting the above compression, damage to the elastic member 400 can be suppressed.
  • the structure of the elastic member 400 can be simplified.
  • the second pinion shaft is inserted by inserting the first bent portion 401 and the second bent portion 402 in a compressed state in the first insertion groove 330 and the second insertion groove 331.
  • the rattling of the elastic member 200 with respect to 111 can be suppressed.
  • the power steering device is a rack bar, and includes a rack bar main body, a first rack tooth, and a second rack tooth, and the first rack tooth is
  • the rack bar is provided in the rack bar main body
  • the second rack teeth are provided at positions separated from the first rack teeth in the longitudinal direction of the rack bar
  • the first pinion shaft A first pinion shaft main body and a first pinion tooth, wherein the first pinion shaft main body is rotatable with rotation of a steering wheel, and the first pinion teeth are A first pinion shaft and a second pinion shaft provided in the pinion shaft main body and meshing with the first rack teeth;
  • the elastic member enabling rotation between the second pinion shaft and the worm wheel relative to the rotational axis of the second pinion shaft, the worm shaft meshing with the worm wheel, and an electric motor applying rotational force to the worm shaft And.
  • the elastic member is provided on the second pinion shaft.
  • the elastic member includes a torsion bar.
  • the worm wheel includes a metal base and a resin tooth portion, and the elastic member is connected to the metal base.
  • the worm wheel is formed of a resin material.
  • the elastic member overlaps the worm wheel in the direction of the rotation axis of the second pinion shaft.
  • the elastic member has an elastic member base provided between the torsion bar and the worm wheel, and the elastic member base is A shaft side rotation connected to a worm wheel and having a base side rotation restricting portion, wherein the second pinion shaft restricts twisting of the elastic member by a predetermined angle or more by abutting on the base side rotation restricting portion Has a regulatory unit.
  • the elastic member has an elastic member base provided between the torsion bar and the worm wheel, and the elastic member base is a base It has a side rotation control part, the 2nd pinion shaft has a shaft side rotation control part, the buffer member is formed with elastic material, and between the base side rotation control part and the shaft side rotation control part Provided in
  • the elastic member has an elastic member base provided between the torsion bar and the worm wheel, and the elastic member base is A shaft side fall down regulation which is connected to a worm wheel and has a base side fall down regulation part, and the second pinion shaft abuts on the base side fall down regulation part to regulate a predetermined or more fall of the elastic member Have a department.
  • the base-side tilt restricting portion includes a base-side rotation restricting portion integrally formed with the base-side tilt restricting portion, and the second pinion
  • the shaft includes a shaft side rotation restricting portion integrally formed with the shaft side inclination restricting portion, and the shaft side rotation restricting portion abuts on the base side rotation restricting portion to have a predetermined angle or more of the elastic member. Regulate twisting.
  • the elastic member includes a leaf spring.
  • the second pinion shaft includes a first insertion groove and a second insertion groove extending in a radial direction of a rotation axis of the second pinion shaft.
  • the elastic member has a first bending portion and a second bending portion which are compressible in the circumferential direction of the rotation axis of the second pinion shaft in each of the first insertion groove and the second insertion groove.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Power Steering Mechanism (AREA)

Abstract

La présente invention comprend : un premier arbre de pignon (104) qui est relié à un volant de direction (101) et qui est pourvu de premières dents de pignon (104b) qui s'engrènent avec des premières dents de crémaillère (105b) formées sur une barre de crémaillère ; et un deuxième arbre de pignon (111) qui est relié à une roue à vis sans fin (110) et qui est pourvu de deuxièmes dents de pignon (111b) qui s'engrènent avec des deuxièmes dents de crémaillère (105c) formées sur la barre de crémaillère. La présente invention comprend en outre un élément élastique (200) qui est disposé entre la roue à vis sans fin (110) et la partie d'engrènement des deuxièmes dents de crémaillère (105c) et des deuxièmes dents de pignon (111b) et qui permet une rotation relative du deuxième arbre de pignon (111) et de la roue à vis sans fin (110) sur l'axe de rotation du deuxième arbre de pignon (111).
PCT/JP2018/029706 2017-09-13 2018-08-08 Dispositif de direction assistée WO2019054095A1 (fr)

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JP2017-175842 2017-09-13
JP2017175842A JP2019051764A (ja) 2017-09-13 2017-09-13 パワーステアリング装置

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6282275U (fr) * 1985-11-13 1987-05-26
JP2003112635A (ja) * 2001-10-04 2003-04-15 Koyo Seiko Co Ltd 電動式動力舵取装置
JP2006143186A (ja) * 2004-10-22 2006-06-08 Nsk Ltd 電動パワーステアリング装置
JP2006292655A (ja) * 2005-04-14 2006-10-26 Nissan Motor Co Ltd 角度検出器の継手構造
JP2007155117A (ja) * 2005-11-14 2007-06-21 Nsk Ltd 回転軸用結合装置及び回転軸用結合装置用緩衝部材の製造方法
JP2017128210A (ja) * 2016-01-20 2017-07-27 株式会社ショーワ 操舵装置用ギヤ、及び操舵装置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6282275U (fr) * 1985-11-13 1987-05-26
JP2003112635A (ja) * 2001-10-04 2003-04-15 Koyo Seiko Co Ltd 電動式動力舵取装置
JP2006143186A (ja) * 2004-10-22 2006-06-08 Nsk Ltd 電動パワーステアリング装置
JP2006292655A (ja) * 2005-04-14 2006-10-26 Nissan Motor Co Ltd 角度検出器の継手構造
JP2007155117A (ja) * 2005-11-14 2007-06-21 Nsk Ltd 回転軸用結合装置及び回転軸用結合装置用緩衝部材の製造方法
JP2017128210A (ja) * 2016-01-20 2017-07-27 株式会社ショーワ 操舵装置用ギヤ、及び操舵装置

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