WO2014200051A1 - 電動式パワーステアリング装置 - Google Patents
電動式パワーステアリング装置 Download PDFInfo
- Publication number
- WO2014200051A1 WO2014200051A1 PCT/JP2014/065566 JP2014065566W WO2014200051A1 WO 2014200051 A1 WO2014200051 A1 WO 2014200051A1 JP 2014065566 W JP2014065566 W JP 2014065566W WO 2014200051 A1 WO2014200051 A1 WO 2014200051A1
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- WIPO (PCT)
- Prior art keywords
- output shaft
- male
- input shaft
- female
- groove
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D6/00—Arrangements for automatically controlling steering depending on driving conditions sensed and responded to, e.g. control circuits
- B62D6/08—Arrangements for automatically controlling steering depending on driving conditions sensed and responded to, e.g. control circuits responsive only to driver input torque
- B62D6/10—Arrangements for automatically controlling steering depending on driving conditions sensed and responded to, e.g. control circuits responsive only to driver input torque characterised by means for sensing or determining torque
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
- B62D5/0409—Electric motor acting on the steering column
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- 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
- G01L3/105—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 inductive means
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- 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
Definitions
- the present invention relates to an electric power steering apparatus configured to reduce the force required for a driver to operate a steering wheel using an electric motor as a source of auxiliary power.
- the automobile steering device is configured as shown in FIG. 6, and transmits the rotation of the steering wheel 1 to the input shaft 3 of the steering gear unit 2, and a pair of left and right tie rods 4 as the input shaft 3 rotates. 4 is pushed and pulled to give a steering angle to the front wheels.
- the steering wheel 1 is supported and fixed to the rear end portion of the steering shaft 5.
- the steering shaft 5 is rotatably supported by the steering column 6 with the cylindrical steering column 6 supported by the vehicle body inserted in the axial direction.
- the front end portion of the steering shaft 5 is connected to the rear end portion of the intermediate shaft 8 via a universal joint 7, and the front end portion of the intermediate shaft 8 is connected to the input shaft 3 via another universal joint 9. .
- the illustrated example is an electric power steering device that reduces the force required to operate the steering wheel 1 using the electric motor 10 as a source of auxiliary power.
- the front-rear direction refers to the front-rear direction of the vehicle unless otherwise specified.
- FIG. 7 to 9 show the electric power steering apparatus disclosed in Patent Document 1.
- FIG. The steering column 6a is configured by combining the inner column 11 and the outer column 12 so that the entire length can be contracted at the time of a secondary collision, and is supported by the vehicle body.
- a steering shaft 5a rotatably supported inside the steering column 6a is configured by combining a lower shaft 13 and an upper shaft 14 so that torque can be transmitted and the entire length can be contracted during a secondary collision.
- the steering wheel 1 (see FIG. 6) is fixed to the rear end portion of the upper shaft 14 protruding from the rear end opening of the outer column 12.
- a housing 15 is coupled and fixed to a front end portion of the inner column 11, and a front half portion of the lower shaft 13 is inserted inside the housing 15.
- An output shaft 16 is rotatably supported by a pair of ball bearings 17 and 18 inside the housing 15 and on the front side of the lower shaft 13 as an input shaft.
- a universal joint 7 (see FIG. 6) is coupled to the front end portion of the output shaft 16 protruding from the front end opening of the housing 15.
- the output shaft 16 and the lower shaft 13 are connected via a torsion bar 19. Most of the torsion bar 19 except the front end portion thereof is disposed on the inner diameter side of the lower shaft 13 formed in a hollow shaft shape.
- a cylindrical portion 20 is provided at the rear end portion of the output shaft 16.
- an uneven female stopper portion 21 in the circumferential direction is provided on the inner peripheral surface of the cylindrical portion 20, on the inner peripheral surface of the cylindrical portion 20, an uneven female stopper portion 21 in the circumferential direction is provided.
- the female stopper portion 21 includes a plurality of female side teeth portions 22 and a plurality of female side groove portions 23 on the inner peripheral surface of the tubular portion 20.
- the plurality of female side tooth portions 22 and the plurality of female side groove portions 23 extend in the axial direction, and are arranged alternately and at equal pitches in the circumferential direction.
- an uneven male stopper 24 in the circumferential direction is provided at the front end of the outer peripheral surface of the lower shaft 13.
- the male stopper portion 24 has a plurality of male side teeth portions 25, 25 and a plurality of male side teeth portions 25, 25 and a plurality of male side grooves 26, 26 at the front end portion of the outer peripheral surface of the lower shaft 13.
- the male side grooves 26 and 26 extend in the axial direction, and are arranged alternately and at equal pitches in the circumferential direction.
- the number of male side teeth 25, 25 (male side grooves 26, 26) is equal to the number of female side grooves 23 (female side teeth 22).
- the male stopper portion 24 and the female stopper portion 21 are capable of relative rotation in a predetermined angle range (for example, a range of ⁇ 5 degrees with respect to a neutral state where the torsion bar 19 is not twisted) (such as loose spline engagement). ) Concavity and convexity are engaged. Thereby, the excessive twist of the torsion bar 19 is prevented.
- the lower shaft 13 is made of steel, which is a magnetic metal.
- a torque near the front end of the outer peripheral surface of the lower shaft 13 adjacent to the rear side of the male stopper portion 24 has a circumscribed circle diameter larger than that of the male stopper portion 24 in the circumferential direction.
- a detection uneven portion 27 is provided.
- Such a torque detecting concavo-convex portion 27 is configured by arranging a plurality of detecting groove portions 28, 28, which are each long in the axial direction, at equal intervals in the circumferential direction at a portion near the front end of the outer peripheral surface of the lower shaft 13. Has been.
- the diameter of the groove bottom circle of the torque detecting uneven portion 27 and the diameter of the groove bottom circle of the male stopper portion 24 are equal.
- the number of the detection groove portions 28, 28 is equal to the number of the male groove portions 26, 26, and the male groove portions 26, 26 and the detection groove portions 28, 28 are continuous in the axial direction (circumferential (With the phases in the direction matched).
- a cylindrical torque detection sleeve 29 made of a nonmagnetic metal having conductivity such as an aluminum alloy is disposed on the outer diameter side of the torque detection uneven portion 27.
- the proximal end portion of the torque detection sleeve 29 is externally fixed to the cylindrical portion 20.
- a plurality of window holes 30 are provided in a portion of the torque detection sleeve 29 located on the outer diameter side of the torque detection uneven portion 27.
- a torque detecting coil unit 31 fitted and fixed to the housing 15 is disposed on the outer diameter side of the torque detecting uneven portion 27 and the torque detecting sleeve 29, a torque detecting coil unit 31 fitted and fixed to the housing 15 is disposed.
- a worm wheel 32 is fitted and fixed to a portion near the rear end of the output shaft 16.
- the worm wheel 32 is engaged with a worm 33 that is rotatably supported in the housing 15.
- An electric motor 10 (see FIG. 6) is supported and fixed to the housing 15.
- the output shaft of the electric motor 10 is coupled to the proximal end portion of the worm 33 so that torque can be transmitted.
- the electric power steering apparatus when a torque, which is a steering force, is applied to the steering shaft 5a by the driver operating the steering wheel 1, the direction and magnitude of this torque are determined.
- the torsion bar 19 is elastically twisted (within a predetermined angle range) by a corresponding amount.
- a change in the circumferential positional relationship between the torque detecting concave-convex portion 27 and the torque detecting sleeve 29 causes an impedance change in the coil of the torque detecting coil unit 31. Based on this impedance change, the direction and magnitude of the torque can be detected.
- the electric motor generates auxiliary power in accordance with the torque detection result.
- Auxiliary power is applied to the output shaft 16 after being increased by a worm-type speed reducer 34 configured by meshing the worm 33 and the worm wheel 32. As a result, the force required for the driver to operate the steering wheel 1 is reduced.
- the height is large enough to ensure the mechanical strength of the cylindrical portion 20, that is, during torque transmission based on the meshing of the tooth portions 22 and 25 of the female stopper portion 21 and the male stopper portion 24 as described above.
- the cylindrical portion 20 is secured to a size that does not cause plastic torsional deformation.
- the torque detecting uneven portion 27 when the diameter of the circumscribed circle of the torque detecting uneven portion 27 is reduced in order to reduce the diameter of each torque detecting component and its peripheral portion, the torque detecting uneven portion In accordance with the diameter of the circumscribed circle 27, the inner diameter dimension of the torque detection sleeve 29 also needs to be reduced. Furthermore, it is necessary to reduce the outer diameter dimension of the cylindrical portion 20 to which the base end portion of the torque detection sleeve 29 is fitted and fixed in accordance with the inner diameter dimension of the torque detection sleeve 29.
- An object of the present invention is to realize a structure that can easily reduce the diameter of each component for torque detection and its peripheral portion while ensuring the mechanical strength of the uneven portion for torque detection.
- an electric power steering apparatus includes an input shaft to which a steering force from a steering wheel is applied, an output shaft to which auxiliary power using an electric motor as a generation source, and the input shaft. And a torsion bar provided on the inner diameter side of the input shaft and the output shaft, and a torque detection sleeve.
- One of the input shaft and the output shaft has a cylindrical portion provided at the one end of the input shaft and the output shaft connected to the other of the input shaft and the output shaft.
- the cylindrical portion includes a female stopper portion provided on an inner peripheral surface of the cylindrical portion, and the female stopper portion includes a plurality of female side teeth and a plurality of female grooves.
- the female side teeth and the plurality of female side grooves extend in the axial direction and are alternately arranged in the circumferential direction.
- the other of the input shaft and the output shaft is connected to the one of the input shaft and the output shaft, a male stopper provided on the outer peripheral surface of the other end of the input shaft and the output shaft, and an axial direction
- the torque detecting uneven portion provided on the outer peripheral surface of the other portion of the input shaft and the output shaft adjacent to the male stopper portion.
- the male stopper portion has a plurality of male side tooth portions and a plurality of male side groove portions, and the plurality of male side tooth portions and the plurality of male side groove portions extend in the axial direction and are circumferential.
- the male stopper portion is engaged with the female stopper portion so as to allow relative rotation in a predetermined angle range with respect to the female stopper portion.
- the torque detection uneven portion has a plurality of detection groove portions, and the plurality of detection groove portions extend in the axial direction and are arranged at equal intervals in the circumferential direction.
- the torque detection sleeve is disposed on the outer diameter side of the torque detection concavo-convex portion and has a proximal end portion that is fitted and fixed to the cylindrical portion.
- the diameter of the groove bottom circle of the male stopper portion is smaller than the diameter of the groove bottom circle of the torque detecting uneven portion.
- the number of the male side groove portions and the number of the detection groove portions may be equal, and the male side groove portions and the detection groove portions may be provided continuously in the axial direction.
- the other of the input shaft and the output shaft may further include a step surface provided between the groove bottom of the male groove and the groove bottom of the detection groove. The step surface faces the other end of the input shaft and the output shaft.
- the other of the input shaft and the output shaft may further include a facing surface provided on an outer peripheral surface of the other portion of the input shaft and the output shaft adjacent to the torque detecting uneven portion in the axial direction. .
- the facing surface faces the other end of the input shaft and the output shaft, and the facing surface and the tip edge of the torque detection sleeve face each other in the axial direction.
- a portion of the step surface and a portion of the axial tip surface of the female tooth portion are axially opposed, and the portion of the step surface and the portion of the axial tip surface of the female tooth portion are The minimum axial distance between them may be smaller than the minimum axial distance between the facing surface and the tip edge of the torque detection sleeve.
- the diameter of the groove bottom circle of the male stopper portion is smaller than the diameter of the groove bottom circle of the torque detecting uneven portion. For this reason, when attempting to reduce the diameter of each torque detection component and its peripheral portion, the diameter of the groove bottom circle of the male stopper portion is made smaller independently of the diameter of the groove bottom circle of the torque detection uneven portion. I can do it. Therefore, when the torque is transmitted based on the engagement between the teeth of the male stopper portion and the female stopper portion, the diameter of the groove bottom circle of the torque detection uneven portion is such that the torque detection uneven portion does not undergo plastic torsional deformation. The diameter of the groove bottom circle of the male stopper portion can be reduced while keeping the size. As a result, it is possible to easily reduce the diameter of each component for torque detection and its peripheral portion while ensuring the mechanical strength of the portion of the other rotating shaft where the uneven portion for torque detection is provided.
- the input shaft and the output shaft are in a direction in which the front end edge of the torque detection sleeve approaches the opposing surface with respect to the axial direction. It is possible to prevent the tip edge of the torque detection sleeve from colliding with the opposing surface due to relative displacement. That is, the tip end surface in the axial direction of the female tooth portion contacts the step surface before the tip edge of the torque detection sleeve hits the opposing surface. Accordingly, the relative displacement of the input shaft and the output shaft in the direction of approaching each other stops, so that the tip edge of the torque detection sleeve can be prevented from colliding with the facing surface. Therefore, assembly workability can be improved.
- the partial cutting side view which shows 1st Embodiment of this invention.
- the left end part enlarged view of FIG.
- the partially cut side view which shows an example of the steering apparatus known conventionally.
- Sectional drawing which shows an example of the conventional structure of an electrically driven power steering apparatus.
- the enlarged view of the upper half part near the left end of FIG. The perspective view of the front part of a lower shaft.
- the electric power steering apparatus of this example includes a steering column 6b, a steering shaft 5b, a housing 15a, an output shaft 16a, a torsion bar 19a, a torque detection sleeve 29a, a torque detection coil unit 31a, and a substrate. 35, an electric motor 10 (see FIG. 6), and a worm reduction gear 34a.
- the steering column 6b is configured by combining a cylindrical inner column 11a disposed on the front side and a cylindrical outer column 12a disposed on the rear side so as to be extendable and contracted, and is supported by the vehicle body by a support bracket 36.
- the inner and outer columns 11a and 12a are made of light alloy such as steel or aluminum alloy.
- the steering shaft 5b has a lower shaft 13a disposed on the front side and a hollow shaft-like upper shaft 14a disposed on the rear side by spline fitting so that torque can be transmitted and relative displacement in the axial direction can be achieved. And is rotatably supported inside the steering column 6b.
- the lower shaft 13a and the upper shaft 14a are made of steel.
- the steering wheel 1 (see FIG. 6) is fixed to the rear end portion of the upper shaft 14a protruding from the rear end opening of the outer column 12a.
- the housing 15a is made of a light alloy such as an aluminum alloy or a synthetic resin, and includes a front lid 37 and a rear main body 38 coupled to each other by a plurality of bolts 39.
- the inner column 11a It is fixedly connected to the front end.
- the front end portion of the lower shaft 13a is inserted inside the housing 15a.
- the output shaft 16a is made of a magnetic metal steel in a hollow shaft shape, and is rotatably supported by a pair of ball bearings 17a and 18a on the front side of the lower shaft 13a in the housing 15a.
- a universal joint 7 (see FIG. 6) is coupled to the front end portion of the output shaft 16a protruding from the front end opening of the housing 15a.
- the torsion bar 19a is made of spring steel.
- the torsion bar 19a includes a lower shaft 13a (an example of an input shaft to which a steering force is applied from a steering wheel) and an output shaft 16a (an axis of rotation that is an electric motor).
- An example of an output shaft to which power is applied is coupled coaxially to each other.
- most of the torsion bar 19a is disposed on the inner diameter side of the output shaft 16a, and the front end of the torsion bar 19a cannot be relatively rotated by the pin 40 to the front end of the output shaft 16a.
- the rear end portion of the lower shaft 13a is spline-fitted into a spline hole 41 provided in the central portion in the radial direction of the portion near the front end of the lower shaft 13a so as not to be relatively rotatable.
- a cylindrical tubular portion 20a is provided at the front end of the lower shaft 13a.
- a female stopper portion 21a having an uneven shape (gear shape) in the circumferential direction in which the diameter of the inscribed circle is larger than that of the spline hole 41.
- the female stopper portion 21a has a plurality of female side teeth portions 22a, 22a and a plurality of female side groove portions 23a, 23a each extending in the axial direction on the inner peripheral surface of the cylindrical portion 20a. And arranged at an equal pitch.
- the outer diameter dimension is a portion closer to the rear end (a portion adjacent to the front side in the axial direction), which will be described later.
- the male stopper portion 24a having a concave-convex shape (gear shape) in the circumferential direction, which is smaller than).
- the male stopper portion 24a has a plurality of male teeth 25a, 25a and a plurality of male grooves 26a, 26a extending in the axial direction at the rear end of the outer peripheral surface of the output shaft 16a. Are arranged alternately and at equal pitches.
- the number of male side teeth 25a, 25a (male side grooves 26a, 26a) is equal to the number of female side grooves 23a, 23a (female side teeth 22a, 22a).
- the female stopper portion 21a and the male stopper portion 24a as described above are capable of relative rotation in a predetermined angle range (for example, a range of ⁇ 5 degrees with respect to a neutral state where the torsion bar 19a is not twisted) (a loose spline). Engagement (like engagement). That is, the female side teeth 22a and 22a (male side teeth 25a and 25a) are loosely engaged with the male side grooves 26a and 26a (female side grooves 23a and 23a) with a circumferential clearance. Thus, the relative rotation between the lower shaft 13a and the output shaft 16a is restricted within a predetermined angle range. Thereby, the excessive twist of the torsion bar 19a is prevented.
- a predetermined angle range for example, a range of ⁇ 5 degrees with respect to a neutral state where the torsion bar 19a is not twisted
- a loose spline Engagement (like engagement). That is, the female side teeth 22a and 22a (male side teeth 25a and 25a) are loosely
- a concave / convex portion 27a for torque detection having a concave / convex shape (gear shape) in the circumferential direction is provided.
- Such a torque detection uneven portion 27a is configured by providing a plurality of detection groove portions 28a, 28a, each of which is long in the axial direction, at equal intervals in the circumferential direction at a portion near the rear end of the outer peripheral surface of the output shaft 16a. It is.
- the number of detection groove portions 28a and 28a is equal to the number of male side groove portions 26a and 26a.
- the detection grooves 28a, 28a and the male grooves 26a, 26a are provided continuously in the axial direction. That is, the phase of the arrangement
- the diameter d of the groove bottom circle of the male stopper portion 24a is smaller than the diameter D of the groove bottom circle of the torque detecting uneven portion 27a (d ⁇ D).
- each male side groove part 26a, 26a and the groove bottom of each detection groove part 28a, 28a a step surface 42 facing the rear end side (right side in FIGS. 1 to 3) of the output shaft 16a, 42 is provided.
- the inner diameter side portion of the axial front end surface (front end surface) of the female side teeth 22a, 22a is opposed in the axial direction, and the minimum axial direction between the opposed portions is The distance is T.
- a fitting cylindrical surface portion 43 having an outer diameter larger than that of the torque detection uneven portion 27a is provided on the front side of the torque detection uneven portion 27a in the axial direction of the outer peripheral surface of the output shaft 16a. .
- An inner ring constituting the ball bearing 18 a is externally supported by the fitting cylindrical surface portion 43.
- a partially conical cylindrical large-diameter step surface 44 (opposing surface) facing the rear end side (right side in FIGS. 1 to 3) of the output shaft 16a. Example) is provided.
- the torque detection sleeve 29a is made of a conductive nonmagnetic metal such as an aluminum alloy in a cylindrical shape, and is concentrically arranged on the outer diameter side of the torque detection uneven portion 27a.
- a proximal end portion (rear end portion) of the torque detection sleeve 29a is externally fixed to the cylindrical portion 20a.
- a plurality of axial grooves 45, 45 that are each long in the axial direction are provided at equal intervals in the circumferential direction on the outer peripheral surface of the cylindrical portion 20a.
- a pair of circumferential grooves 46a and 46b, each of which is long in the circumferential direction, are formed on the outer peripheral surface portion of the cylindrical portion 20a that overlaps with the region where the female and male stopper portions 21a and 24a are engaged with each other. Is provided.
- Torque detection for the tubular portion 20a is performed by engaging a plurality of protrusions 47, 47 provided on the proximal end portion of the inner peripheral surface of the torque detection sleeve 29a, with each of the axial grooves 45, 45 one by one. The sleeve 29a is prevented from rotating.
- the torque detection sleeve 29a By staking the proximal end edge portion and the proximal end portion of the torque detection sleeve 29a into the circumferential grooves 46a and 46b, the torque detection sleeve 29a can be positioned in the axial direction and prevented from being displaced with respect to the tubular portion 20a. It has been.
- a plurality of substantially rectangular window holes 30a are provided at the tip portion (front end portion) or the middle portion of the torque detection sleeve 29a, which is the torque detection sleeve 29a portion disposed on the outer diameter side of the torque detection uneven portion 27a.
- 30a are provided in double rows in the axial direction and at equal intervals in the circumferential direction.
- the circumferential direction phases of the two window holes 30a and 30a are shifted from each other by a half pitch.
- the inner diameter dimension of the torque detecting sleeve 29a disposed on the outer diameter side of the torque detecting uneven portion 27a is larger by about 0.5 mm than the diameter (outer diameter size) of the circumscribed circle of the torque detecting uneven portion 27a. It has become.
- the tip edge of the torque detection sleeve 29a is opposed to the large-diameter side step surface 44 in the axial direction, and the minimum axial distance between the opposed portions is S.
- the minimum axial distance T is smaller than the minimum axial distance S (T ⁇ S).
- the torque detection coil unit 31a is formed in a cylindrical shape, and is concentrically disposed on the outer diameter side of the torque detection uneven portion 27a and the torque detection sleeve 29a.
- the torque detection coil unit 31a is fitted and fixed to the housing 15a, and includes a pair of coils 48 and 48. These two coils 48 and 48 are arranged so as to overlap in a radial direction with respect to a portion of the torque detection sleeve 29a provided with both rows of window holes 30a and 30a.
- the substrate 35 is installed below the torque detection coil unit 31a in the housing 15a.
- a motor control circuit is configured on the substrate 35. The end portions of the coils 48 are connected to the motor control circuit.
- the worm reduction gear 34a is configured by combining a worm wheel 32a and a worm (not shown).
- the worm wheel 32a is externally fitted and fixed to a substantially central portion in the axial direction of the output shaft 16a, which is a portion of the output shaft 16a between the ball bearings 17a and 18a.
- a worm (not shown) is rotatably supported in the housing 15a while meshing with the worm wheel 32a.
- the electric motor 10 (see FIG. 6) is supported and fixed to the housing 15a.
- the output shaft of the electric motor 10 is coupled to a worm base end (not shown) so that torque can be transmitted.
- a ring 49 is installed.
- the seal ring 49 is a cylinder provided with a bifurcated distal end edge adjacent to the rear end portion of the inner surface of the housing 15a in a state where the seal ring 49 is externally fitted and fixed to the proximal end portion of the torque detection sleeve 29a.
- the inner peripheral surface 50 and the step surface 51 facing forward (axially facing the rear end of the seal ring 49) are in sliding contact with the entire circumference.
- the torsion bar 19a is elastically twisted (within a predetermined angle range).
- a change in the circumferential positional relationship between the torque detecting concave-convex portion 27a and the torque detecting sleeve 29a causes impedance changes in the coils 48 and 48 constituting the torque detecting coil unit 31a. Based on this impedance change, the direction and magnitude of the torque can be detected.
- the motor control circuit on the substrate 35 uses the torque detection result to control energization of the electric motor 10, thereby generating auxiliary power corresponding to the direction and magnitude of the torque in the electric motor 10.
- the auxiliary power is increased by the worm type reduction gear 34a and then applied to the output shaft 16a. As a result, the force required for the driver to operate the steering wheel 1 is reduced.
- the diameter of the circumscribed circle of the torque detecting uneven portion 27a is reduced in order to reduce the diameter of each component for torque detection and the peripheral portion thereof.
- the inner diameter dimension of the torque detection sleeve 29a needs to be reduced in accordance with the diameter of the circumscribed circle of the torque detection uneven portion 27a. Furthermore, it is necessary to reduce the outer diameter of the cylindrical portion 20a to which the proximal end portion of the torque detection sleeve 29a is fitted and fixed in accordance with the inner diameter of the torque detection sleeve 29a.
- the radial thickness of the outer diameter side portion of the cylindrical portion 20a with respect to the groove bottom circle of the female stopper portion 21a, and each female side When the outer diameter of the cylindrical portion 20a is reduced without changing the radial height of the tooth portions 22a, 22a, the tooth tips and groove bottoms of the female stopper portion 21a and the male stopper portion 24a.
- a configuration is adopted in which the diameter d of the groove bottom circle of the male stopper portion 24a is smaller (d ⁇ D) than the diameter D of the groove bottom circle of the torque detecting uneven portion 27a. Therefore, when reducing the diameter of each torque detection component and its peripheral portion, the diameter d of the groove bottom circle of the male stopper portion 24a is independent of the diameter D of the groove bottom circle of the torque detection uneven portion 27a. Can be made smaller.
- the diameter D of the groove bottom circle of the torque detecting uneven portion 27a is set to a size that can sufficiently ensure the mechanical strength of the output shaft 16a near the rear end portion where the torque detecting uneven portion 27a is provided, That is, when transmitting torque based on the engagement between the tooth portions 22a and 25a of the male stopper portion 24a and the female stopper portion 21a, the male stopper portion 24a is kept in a size that does not cause the plastic torsional deformation 27a.
- the diameter d of the groove bottom circle can be reduced. As a result, it is possible to easily reduce the diameter of each torque detection component and its peripheral portion while ensuring the mechanical strength of the portion near the rear end where the torque detection uneven portion 27a is provided in the output shaft 16a.
- the lower shaft 13a and the output shaft 16a are prevented from relative displacement in the direction approaching each other with respect to the axial direction by the torsion bar 19a and the pin 40.
- the lower shaft 13a and the output shaft 16a may be relatively displaced in a direction closer to the axial direction than in the state shown in FIGS.
- the present invention is applied to a structure in which an output shaft to which auxiliary power is applied is connected to a lower shaft (input shaft) of a steering shaft.
- the present invention can also be applied to a structure in which an output shaft to which auxiliary power is applied is connected to an input shaft of a steering gear unit.
- the present invention can also be applied to a structure in which a cylindrical portion having a female stopper portion is provided on the output shaft and a male stopper portion and a male stopper portion are provided on the input shaft, as in the conventional structure described above.
Abstract
Description
2 ステアリングギヤユニット
3 入力軸
4 タイロッド
5、5a、5b ステアリングシャフト
6、6a、6b ステアリングコラム
7 自在継手
8 中間シャフト
9 自在継手
10 電動モータ
11、11a インナコラム
12、12a アウタコラム
13、13a ロアシャフト
14、14a アッパシャフト
15、15a ハウジング
16、16a 出力軸
17、17a 玉軸受
18、18a 玉軸受
19、19a トーションバー
20、20a 筒状部
21、21a 雌ストッパ部
22、22a 雌側歯部
23、23a 雌側溝部
24、24a 雄ストッパ部
25、25a 雄側歯部
26、26a 雄側溝部
27、27a トルク検出用凹凸部
28、28a 検出用溝部
29、29a トルク検出用スリーブ
30、30a 窓孔
31、31a トルク検出用コイルユニット
32、32a ウォームホイール
33 ウォーム
34、34a ウォーム式減速機
35 基板
36 支持ブラケット
37 蓋体
38 本体
39 ボルト
40 ピン
41 スプライン孔
42 段差面
43 嵌合用円筒面部
44 大径側段差面
45 軸方向溝
46a、46b 周方向溝
47 突起
48 コイル
49 シールリング
50 内周面
51 段差面
Claims (3)
- ステアリングホイールからの操舵力を付与される入力軸と、
電動モータを発生源とする補助動力を付与される出力軸と、
前記入力軸と出力軸とを同軸に連結する状態で、前記入力軸及び出力軸の内径側に設けられたトーションバーと、
トルク検出用スリーブと、を備え
前記入力軸と出力軸の一方は、前記入力軸と出力軸の他方に連結された前記入力軸と出力軸の前記一方の端部に設けられた筒状部を有し、
前記筒状部は、当該筒状部の内周面に設けられた雌ストッパ部を有し、当該雌ストッパ部は、複数の雌側歯部と複数の雌側溝部とを有し、当該複数の雌側歯部と複数の雌側溝部は、軸方向に延在し、且つ、円周方向に関して交互に配置され、
前記入力軸と出力軸の前記他方は、前記入力軸と出力軸の前記一方に連結される前記入力軸と出力軸の前記他方の端部の外周面に設けられた雄ストッパ部と、軸方向に関して前記雄ストッパ部に隣接する前記入力軸と出力軸の前記他方の部分の外周面に設けられたトルク検出用凹凸部と、を有し、
前記雄ストッパ部は、複数の雄側歯部と複数の雄側溝部とを有し、当該複数の雄側歯部と複数の雄側溝部は、軸方向に延在し、且つ、円周方向に関して交互に配置され、前記雄ストッパ部は、前記雌ストッパ部に対し、所定角度範囲での相対回転を可能に凹凸係合され、
前記トルク検出用凹凸部は、複数の検出用溝部を有し、当該複数の検出用溝部は、軸方向に延在し、且つ、円周方向に関して等間隔に配置され、
前記トルク検出用スリーブは、前記トルク検出用凹凸部の外径側に配置されると共に、前記筒状部に外嵌固定された基端部を有し、
前記雄ストッパ部の溝底円の直径は、前記トルク検出用凹凸部の溝底円の直径よりも小さい、電動式パワーステアリング装置。 - 前記雄側溝部の数と前記検出用溝部の数が等しく、
前記雄側溝部と前記検出用溝部とが軸方向に連続して設けられ、
前記入力軸と出力軸の前記他方は、前記雄側溝部の溝底と前記検出用溝部の溝底との間に設けられた段差面をさらに有し、当該段差面は、前記入力軸と出力軸の前記他方の前記一端部の側を向いている、請求項1に記載した電動式パワーステアリング装置。 - 前記入力軸と出力軸の前記他方は、軸方向に関して前記トルク検出用凹凸部に隣接する前記入力軸と出力軸の前記他方の部分の外周面に設けられた対向面をさらに有し、当該対向面は、前記入力軸と出力軸の前記他方の前記一端部の側を向いていると共に、当該対向面と前記トルク検出用スリーブの先端縁とが軸方向に対向し、
前記段差面の一部分と、前記雌側歯部の軸方向先端面の一部分とが、軸方向に対向し、
前記段差面の前記一部分と前記雌側歯部の軸方向先端面の前記一部分との間の最小軸方向距離が、前記対向面と前記トルク検出用スリーブの前記先端縁との間の最小軸方向距離よりも小さく、これにより、前記段差面と前記雌側歯部の軸方向先端面が、組立時に当接可能になる、
請求項2に記載した電動式パワーステアリング装置。
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CN201480017778.1A CN105121255B (zh) | 2013-06-14 | 2014-06-12 | 电动式助力转向装置 |
EP14810154.6A EP3009330B1 (en) | 2013-06-14 | 2014-06-12 | Electric power steering device |
JP2015522852A JP6052409B2 (ja) | 2013-06-14 | 2014-06-12 | 電動式パワーステアリング装置 |
US14/779,796 US10005490B2 (en) | 2013-06-14 | 2014-06-12 | Electric power steering apparatus |
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DE102016114678A1 (de) * | 2016-08-08 | 2018-02-08 | Thyssenkrupp Ag | Drehlageranordnung für eine Lenksäule eines Kraftfahrzeugs |
CN107117252A (zh) * | 2017-05-04 | 2017-09-01 | 南京奥特博机电科技有限公司 | 一种电动助力自行车 |
DE102017222999B4 (de) * | 2017-12-18 | 2021-10-21 | Robert Bosch Gmbh | Sensoreinrichtung für ein Lenksystem eines Fahrzeugs |
KR20220010898A (ko) * | 2020-07-20 | 2022-01-27 | 현대모비스 주식회사 | 차량용 동력 전달장치 |
CN111982191A (zh) * | 2020-08-11 | 2020-11-24 | 苏州市艾西依钣金制造有限公司 | 精密钣金柜体自动检测流水线 |
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US20160046322A1 (en) | 2016-02-18 |
EP3009330B1 (en) | 2018-05-09 |
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EP3009330A1 (en) | 2016-04-20 |
JP6052409B2 (ja) | 2016-12-27 |
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CN105121255A (zh) | 2015-12-02 |
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