WO2015133168A1 - 電動式パワーステアリング装置及びその組立方法 - Google Patents
電動式パワーステアリング装置及びその組立方法 Download PDFInfo
- Publication number
- WO2015133168A1 WO2015133168A1 PCT/JP2015/050530 JP2015050530W WO2015133168A1 WO 2015133168 A1 WO2015133168 A1 WO 2015133168A1 JP 2015050530 W JP2015050530 W JP 2015050530W WO 2015133168 A1 WO2015133168 A1 WO 2015133168A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- shaft
- prevention member
- connecting hole
- press
- buckling prevention
- Prior art date
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D1/00—Steering controls, i.e. means for initiating a change of direction of the vehicle
- B62D1/02—Steering controls, i.e. means for initiating a change of direction of the vehicle vehicle-mounted
- B62D1/16—Steering columns
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D1/00—Steering controls, i.e. means for initiating a change of direction of the vehicle
- B62D1/02—Steering controls, i.e. means for initiating a change of direction of the vehicle vehicle-mounted
- B62D1/16—Steering columns
- B62D1/18—Steering columns yieldable or adjustable, e.g. tiltable
- B62D1/185—Steering columns yieldable or adjustable, e.g. tiltable adjustable by axial displacement, e.g. telescopically
-
- 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
-
- 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
-
- 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
-
- 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
Definitions
- the present invention relates to an electric power steering apparatus and an assembling method of the 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.
- a structure as shown in FIG. 28 is widely known as a steering device for giving a steering angle to a steering wheel of an automobile.
- a steering shaft 3 is rotatably supported on the inner diameter side of a cylindrical steering column 2 supported by the vehicle body 1.
- the steering wheel 4 is fixed to the rear end portion of the steering shaft 3 protruding from the rear end opening of the steering column 2.
- this rotation is transmitted to the input shaft 8 of the steering gear unit 7 via the steering shaft 3, the universal joint 5a, the intermediate shaft 6, and the universal joint 5b.
- the front-rear direction refers to the front-rear direction of the vehicle unless otherwise specified.
- the example shown in FIG. 28 is an electric power steering apparatus configured to reduce the operation force of the steering wheel 4 by using the electric motor 10 as an auxiliary power source.
- the housing 11 is fixed to the front end portion of the steering column 2, the electric motor 10 is supported on the housing 11, and a plurality of components are provided inside the housing 11.
- each component includes an input shaft 12 to which a steering force from the steering wheel 4 (see FIG. 28) is applied, and auxiliary power using the electric motor 10 (see FIG. 28) as a generation source.
- Is provided on the inner diameter side of the output shaft 13, and both ends of the output shaft 13 are connected to the output shaft 13 and the input shaft 12 so as to transmit torque.
- a torque detector that detects a steering force based on elastic torsional deformation of the torsion bar 14 (see, for example, Patent Document 1).
- the input shaft 12 and the output shaft 13 are engaged with each other by engaging the male and female stopper portions 15 and 16 provided at the axial end portions with a gap in the circumferential direction interposed therebetween.
- the relative rotation is connected within a predetermined angle range.
- the rear end portion (the right end portion in FIG. 29) of the torsion bar 14 is connected to the input shaft 12.
- the rear end portion of the torsion bar 14 is connected to the input shaft 12 so as to transmit torque by being press-fitted into a connecting hole portion 17 provided on the inner diameter side.
- the torsion bar 14 is inserted into the center hole 18 of the output shaft 13, and the front end portion (left end portion in FIG. 29) of the torsion bar 14 is tightened to the connecting hole portion 19 provided at the front end portion of the center hole 18. Fits without having to.
- the male and female stopper portions 15 and 16 are engaged with each other with a circumferential gap interposed therebetween. Then, the front end portion of the output shaft 13 and the front end portion of the torsion bar 14 are aligned with each other in a state where the positional relationship of the input shaft 12 and the output shaft 13 with respect to the rotation direction is matched with the center position of the predetermined angle range.
- a through-hole 20 in the radial direction is formed at the position by drilling. And by inserting the pin 21 into the through hole 20, the front end portion of the torsion bar 14 is connected to the output shaft 13 so that torque can be transmitted.
- the front end portion of the torsion bar 14 and the output shaft 13 are first connected by the pin 21, and then the rear end portion of the torsion bar 14 is connected to the connection hole of the input shaft 12. If it press-fits into the part 17, since the above jig
- connection structure between the front end portion of the torsion bar 14 and the output shaft 13 is changed to a connection structure by press-fitting, the through hole 20 and the pin 21 are not required.
- the removal work (cleaning work) of the chips (iron powder) generated by the formation of the through holes 20 is unnecessary, and the number of parts can be reduced. Cost can be reduced.
- both end portions of the torsion bar 14 are pressed into the two connecting hole portions 17 and 19 in order, so that the end portion on the side press-fitted first in the press-fitting performed later.
- Patent Document 2 describes an electric power steering apparatus having a configuration to which the present invention can be applied.
- the present invention has been made in view of the circumstances as described above, and the purpose of the present invention is to press-fit at least one of the axial ends of the torsion bar into the connecting hole of the counterpart shaft.
- An object of the present invention is to provide an electric power steering apparatus and an assembling method thereof that can prevent buckling of a spring shaft portion.
- the electric power steering apparatus of the present invention is A hollow first shaft; A second shaft disposed coaxially with the first shaft; A pair of connecting shafts provided at both ends in the axial direction and a spring shaft provided between the pair of connecting shafts, and disposed on the inner diameter side of the first shaft.
- the torsion bar connected to the first shaft and the other connecting shaft to the second shaft so as to transmit torque, respectively.
- At least one of the connecting shafts is press-fitted into a connecting hole provided in a counterpart shaft to which the first and second shafts are connected, A steering force from a steering wheel is applied to one of the first and second shafts.
- a buckling prevention member is externally supported (including external fitting fixation) or coupled and fixed to the outer peripheral surface of the spring shaft portion, and the buckling prevention member
- the outer peripheral surface of the first shaft is close to or in contact with the inner peripheral surface of the first shaft.
- the second shaft is disposed coaxially with the first shaft in a state where relative rotation with the first shaft is restricted within a predetermined angle range.
- other members provided in the middle of the steering force transmission mechanism that transmits the movement of the steering wheel to the steered wheels for example, the other shaft of the first and second shafts, or a rack constituting the steering gear unit
- Auxiliary power using an electric motor as a generation source is applied to the shaft.
- Examples of the material constituting the buckling prevention member include various metals (aluminum alloy, magnesium alloy, copper alloy, iron alloy, etc.), synthetic resin ⁇ polyacetal (POM), polyphenylene sulfide (PPS), polyamide (PA), polypropylene (PP), vinyl chloride (PVC), polyethylene (PE), polyethylene terephthalate (PET), polytetrafluoroethylene (PTFE), polyamideimide (PAI), polyetheretherketone (PEEK), etc. ⁇ , Rubber ⁇ Natural rubber (NR), Isoprene rubber (IR), Butadiene rubber (BR), Acrylonitrile butadiene rubber (NBR), Styrene butadiene rubber (SBR), Ethylene propylene rubber (EPDM, EPM), Silicone rubber (Si, SR) , Fluorine It can be employed arm (FKM, FPM), etc. ⁇ .
- POM polyphenylene sulfide
- PA polyamide
- PP polyprop
- the buckling prevention member is externally supported or coupled and fixed to a portion including the central portion in the axial direction of the outer peripheral surface of the spring shaft portion.
- the buckling prevention member is made of, for example, an elastic material, and is parallel to or inclined with respect to the central axis at one place in the circumferential direction ( A cylindrical member having a discontinuous portion) can be obtained.
- the buckling prevention member can be a cylindrical heat-shrinkable tube.
- the buckling prevention member may be a synthetic resin member that is injection-molded on the outer diameter side of the spring shaft portion.
- the buckling prevention member may be a rubber member vulcanized and bonded to the outer peripheral surface of the spring shaft portion.
- the first stopper portion provided at a part of the first shaft in the axial direction (the axial end or the axial intermediate portion), and the first By engaging a second stopper portion provided in a part of the two shafts in the axial direction (axial end portion or axial intermediate portion) with a circumferential clearance interposed therebetween, the first and second The relative rotation between the two shafts is restricted within a predetermined angle range.
- the one connecting shaft portion is connected to the first shaft in a state where torque can be transmitted and relative displacement in the axial direction is prevented.
- connection shaft portion and the first shaft A pin is press-fitted into a radial through hole provided at a position aligned with each other, or one connecting shaft portion and the first shaft are welded or bonded, or one connecting shaft portion and the first The engaging portion with the shaft is plastically deformed (caulked).
- the other connecting shaft is press-fitted into a connecting hole provided in the second shaft.
- the buckling prevention member is disposed between the outer peripheral surface of the spring shaft portion of the torsion bar and the inner peripheral surface of the first shaft, and the one connecting shaft portion is attached to the first shaft.
- the first connection shaft is inserted into the connection hole provided in the second shaft before the first connection.
- at least a portion of the second stopper portion has a dimensional relationship that allows engagement with a gap in the circumferential direction interposed therebetween.
- the first stopper portion provided at a part of the first shaft in the axial direction (the axial end or the axial intermediate portion), and the first By engaging a second stopper portion provided in a part of the two shafts in the axial direction (axial end portion or axial intermediate portion) with a circumferential clearance interposed therebetween, the first and second The relative rotation between the two shafts is restricted within a predetermined angle range.
- the one connecting shaft portion is press-fitted into a connecting hole portion provided in the first shaft.
- the other connecting shaft portion is press-fitted into a connecting hole provided in the second shaft, and abuts against the inner end of the connecting hole.
- the spring shaft of the torsion bar is pressed in the state where the other connecting shaft portion is press-fitted into the connecting hole portion provided in the second shaft and abutted against the back end portion of the connecting hole portion.
- the buckling prevention member is disposed between the outer peripheral surface of the first portion and the inner peripheral surface of the first shaft, the one connecting shaft portion is press-fitted into the connecting hole provided in the first shaft.
- at least one part of said 1st and 2nd stopper part has a dimensional relationship which can be engaged in the state which interposed the clearance gap in the circumferential direction.
- the first stopper portion provided at a part of the first shaft in the axial direction (the axial end or the axial intermediate portion), and the first By engaging a second stopper portion provided in a part of the two shafts in the axial direction (axial end portion or axial intermediate portion) with a circumferential clearance interposed therebetween, the first and second The relative rotation between the two shafts is restricted within a predetermined angle range.
- the one connecting shaft portion is press-fitted into a connecting hole portion provided in the first shaft.
- the other connecting shaft portion is press-fitted into a connecting hole provided in the second shaft, and abuts against the inner end of the connecting hole.
- the torsion bar on which the buckling prevention member is arranged is inserted into the inner diameter side of the first shaft, and the other connecting shaft portion is connected to the connecting hole portion provided in the second shaft.
- at least a part of the first and second stopper portions is given a dimensional relationship that allows engagement with a circumferential gap therebetween.
- the assembly method of the electric power steering apparatus of the present invention is the above-described assembly method of the electric power steering apparatus, wherein the outer peripheral surface of the spring shaft portion of the torsion bar and the inner peripheral surface of the first shaft.
- the buckling prevention member is disposed between the first connecting shaft portion and the first shaft portion so that torque can be transmitted to the first shaft and relative displacement in the axial direction is prevented.
- at least a part of the first and second stopper portions are engaged with each other with a circumferential gap interposed therebetween, and the positional relationship with respect to the rotational direction of the first and second shafts is determined.
- the other connecting shaft portion is press-fitted into the connecting hole portion provided in the second shaft in a state where it is aligned with the center position of the predetermined angle range.
- the method for assembling the electric power steering device is the method for assembling the electric power steering device described above, wherein the other connecting shaft portion of the torsion bar is provided on the second shaft.
- a prevention member is disposed.
- at least a part of the first and second stopper portions are engaged with each other with a circumferential gap interposed therebetween, and the positional relationship with respect to the rotation direction of the first and second shafts is determined.
- the one connecting shaft portion is press-fitted into the connecting hole portion provided in the first shaft in a state of being matched with the center position of the predetermined angle range.
- an electric power steering apparatus assembly method is the above-described electric power steering apparatus assembly method, wherein at least a part of the first and second stopper portions are spaced apart from each other in the circumferential direction.
- the buckling prevention member is disposed in a state where the mutual positional relationship in the rotational direction of the first and second shafts is matched with the center position of the predetermined angle range.
- the torsion bar is inserted into the inner diameter side of the first shaft, and the other connecting shaft portion is press-fitted into the connecting hole portion provided in the second shaft, while the rear end portion of the connecting hole portion is inserted. And the one connecting shaft portion is press-fitted into a connecting hole provided in the first shaft.
- the rear shaft is connected to the counterpart shaft.
- the side connecting shaft portion is press-fitted into the connecting hole provided in the counterpart shaft, or when the pair of connecting shaft portions are press-fitted into the first and second shaft connecting holes.
- the spring shaft portion which is the intermediate portion in the axial direction of the torsion bar, from being buckled. That is, in the case of the present invention, when the connecting shaft portion of the torsion bar is press-fitted into the connecting hole portion provided in the counterpart shaft, a large axial compression force may be applied to the spring shaft portion.
- the buckling prevention member is in contact with or is in contact with the inner peripheral surface of the first shaft. Deformation is prevented. Further, in the case of the present invention, since the buckling deformation of the spring shaft portion can be prevented in this way, vibration transmitted from the steering wheel to the steering wheel can be reduced, and the detection sensitivity of the steering torque can be improved. For this purpose, it is easy to reduce the rigidity of the torsion bar (such as reducing the diameter of the spring shaft).
- FIG. (A) is a side view showing only a torsion bar and a buckling prevention member
- (B) is a sectional view taken along line III-III in (A).
- Sectional drawing which takes out only some components, such as an input shaft, an output shaft, a torsion bar, and a buckling prevention member, and shows the middle stage of the assembly of each of these components.
- Sectional drawing which shows the step following FIG. 4 of the assembly of each components.
- Sectional drawing which shows the state after completion of the assembly of each components.
- Sectional drawing which takes out only some components, such as an input shaft, an output shaft, a torsion bar, and a buckling prevention member, from the structure of 2nd Embodiment of this invention, and shows the middle stage of the assembly of these each components.
- Sectional drawing which shows the step following FIG. 7 of the assembly of each components.
- Sectional drawing which shows the state after completion of the assembly of each components.
- the side view of the torsion bar and buckling deformation member which shows 3rd Embodiment of this invention.
- the figure similar to FIG. 10 which shows 4th Embodiment.
- FIG. 10 which shows 5th Embodiment.
- FIG. 10 which shows 6th Embodiment.
- (A) is a side view showing the torsion bar and the buckling prevention member of the seventh embodiment in a state before the buckling deformation member is thermally contracted
- (B) is a sectional view taken along XIV-XIV
- (C) is a sectional view thereof.
- (D) is the XIV'-XIV 'sectional drawing.
- (A) is a side view of a torsion bar and a buckling deformable member showing an eighth embodiment
- (B) is a cross-sectional view taken along XV-XV in (A).
- FIG. 10 which shows 9th Embodiment.
- FIG. 10 which shows 9th Embodiment.
- FIG. 10 shows 9th Embodiment.
- FIG. 10 which shows 10th Embodiment.
- A is a side view of a torsion bar and a buckling deformable member showing an eleventh embodiment
- (B) is a sectional view taken along line XVIII-XVIII of (A).
- A) is a side view of a torsion bar and a buckling deformable member, showing a twelfth embodiment
- B) is a cross-sectional view along XIX-XIX in (A).
- the principal part sectional drawing which shows the 1st example of the structure which can aim at the ease of the operation
- Sectional drawing which takes out only some components, such as an input shaft and an output shaft, from the structure of 14th Embodiment of this invention, and shows the intermediate
- Sectional drawing which shows the step following FIG. 25 of the assembly of each components.
- Sectional drawing which shows the state after completion of the assembly of each components.
- the partially cut side view which shows an example of the electric power steering apparatus conventionally known.
- the electric power steering apparatus includes a steering column 2a, a steering shaft 3a, a housing 11a, an output shaft 13a, a torsion bar 14a, a buckling prevention member 37, a torque detection sleeve 22, and a torque.
- a detection coil unit 23, an electric motor 10 (see FIG. 28), and a worm-type speed reducer 24 are provided.
- the steering column 2a is formed by combining a cylindrical inner column 25 disposed on the front side and a cylindrical outer column 26 disposed on the rear side in a telescopic manner, and is supported on the vehicle body by a support bracket 27.
- the inner column 25 and the outer column 26 are made of light alloy such as steel or aluminum alloy.
- a hollow shaft-like upper shaft 29 arranged on the rear side is spline-fitted to a lower shaft 28 arranged on the front side so that torque can be transmitted and relative displacement in the axial direction can be achieved. And is rotatably supported inside the steering column 2a.
- the lower shaft 28 and the upper shaft 29 are made of steel.
- a steering wheel 4 (see FIG. 28) is fixed to the rear end portion of the upper shaft 29 protruding from the rear end opening of the outer column 26.
- the housing 11a is made of a light alloy such as an aluminum alloy or a synthetic resin, and is formed by connecting a front lid 30 and a rear main body 31 to each other by a plurality of bolts 32.
- the front end of 25 is coupled and fixed.
- the front end portion of the lower shaft 28 is inserted inside the housing 11a.
- the output shaft 13a is made of a magnetic metal steel in a hollow shape, and is rotatably supported by a pair of ball bearings 33 and 34 on the front side of the lower shaft 28 in the housing 11a.
- a universal joint 5a (see FIG. 28) is coupled to the front end portion of the output shaft 13a protruding from the front end opening of the housing 11a.
- the torsion bar 14a is made of steel such as spring steel, and both axial end portions thereof are a pair of connecting shaft portions 35a and 35b, and an intermediate portion in the axial direction that is a portion between the connecting shaft portions 35a and 35b is used as a spring shaft. This is part 36.
- the outer diameter dimension of the spring shaft portion 36 is smaller than the outer diameter size of both the connecting shaft portions 35a and 35b over the entire length.
- the outer peripheral surface of the spring shaft portion 36 has an axially intermediate portion (most portion excluding both end portions in the axial direction) as a simple cylindrical surface, and both end portions in the axial direction are respectively connected to both connecting shaft portions 35a,
- the inclined surface is inclined in the direction in which the outer diameter dimension increases toward the side of 35b.
- the front connecting shaft portion 35a is input to the output shaft 13a which is the first shaft, and the rear connecting shaft portion 35b is input to the second shaft.
- Each shaft is connected to a lower shaft 28 which is a shaft so that torque can be transmitted.
- the front connecting shaft portion 35a in order to connect the front connecting shaft portion 35a to the output shaft 13a so that torque can be transmitted, the front connecting shaft portion 35a is provided at the front end portion of the center hole 18a of the output shaft 13a.
- the connecting hole 19a is fitted inside.
- the pin 21a is press-fitted into the radial through hole 20a formed at the position where the front connecting shaft portion 35a and the front end portion of the output shaft 13a are aligned with each other.
- the rear connecting shaft portion 35b in order to connect the rear connecting shaft portion 35b to the lower shaft 28 so that torque can be transmitted, the rear connecting shaft portion 35b is provided on the inner diameter side near the front end of the lower shaft 28. Are press-fitted into the connecting hole portion 17a.
- the male serration that has been subjected to hardening treatment such as quenching provided on the outer peripheral surface of the rear connection shaft portion 35b is not subjected to hardening treatment, and the cylindrical inner periphery of the connection hole portion 17a. The surface is mechanically cut.
- the buckling prevention member 37 is a cylinder made of various metals, synthetic resins, rubbers, etc. as described above and having a cut (discontinuous portion) parallel to the central axis at one circumferential direction. It is a member of the shape (a part cylinder shape).
- the buckling prevention member 37 has its outer peripheral surface in proximity to or in contact with the cylindrical inner peripheral surface of the output shaft 13a in a state of being externally supported by the spring shaft portion 36 of the torsion bar 14a.
- the axial dimension of the buckling prevention member 37 is the axis of the axial middle part of the spring shaft part 36 (the part where the outer peripheral surface is a simple cylindrical surface in most parts excluding both axial ends).
- the inner peripheral surface of the buckling prevention member 37 is in contact with the outer peripheral surface of the intermediate portion in the axial direction of the spring shaft portion 36 as a whole.
- the buckling prevention member 37 is loosely fitted to the spring shaft portion 36, and a minute gap is formed between the peripheral surfaces of both members (parts) 37, 36 facing each other. It can also exist.
- a cylindrical tube portion 38 is provided at the front end portion of the lower shaft 28.
- a concave and convex (gear-shaped) female stopper portion 15a in the circumferential direction which is a second stopper portion, is provided.
- the female stopper portion 15a is formed by arranging a plurality of female side tooth portions and female side groove portions, each of which is long in the axial direction, on the inner peripheral surface of the cylindrical portion 38 alternately and at equal pitches in the circumferential direction. .
- the outer peripheral surface of the rear end portion of the output shaft 13a is provided with a male stopper portion 16a having a concavo-convex shape (gear shape) in the circumferential direction, which is a first stopper portion.
- the male stopper portion 16a has a plurality of male side teeth and male side grooves that are long in the axial direction on the outer peripheral surface of the rear end portion of the output shaft 13a, arranged alternately and at equal pitches in the circumferential direction. Become.
- the number of each male side tooth part (each male side groove part) and the number of each female side groove part (each female side tooth part) are equal to each other.
- the female stopper portion 15a and the male stopper portion 16a as described above are relatively rotated within a predetermined angle range (for example, a range of ⁇ 5 degrees with respect to a neutral state where the spring shaft portion 36 of the torsion bar 14a is not twisted). Engagement is possible (like loose spline engagement). That is, each female-side tooth portion (each male-side tooth portion) is loosely engaged with each male-side groove portion (each female-side groove portion) with a gap interposed on both sides in the circumferential direction. And the relative rotation between the output shaft 13a are restricted within a predetermined angle range. As a result, excessive twisting of the spring shaft portion 36 of the torsion bar 14a is prevented.
- a predetermined angle range for example, a range of ⁇ 5 degrees with respect to a neutral state where the spring shaft portion 36 of the torsion bar 14a is not twisted.
- a predetermined angle range for example, a range of ⁇ 5 degrees with respect to a neutral state where the spring shaft portion
- the diameter of the circumscribed circle is larger than that of the male stopper portion 16a in the portion near the rear end, which is the portion adjacent to the front side of the male stopper portion 16a in the axial direction.
- a concave / convex portion 39 for torque detection having a concave / convex shape (gear shape) in the circumferential direction is provided.
- the torque detection uneven portion 39 is formed by providing a plurality of detection groove portions, 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 13a.
- the number of detection groove portions and the number of male side groove portions constituting the male stopper portion 16a are equal to each other.
- each detection groove and each male groove are provided continuously in the axial direction.
- the torque detection sleeve 22 is made of a conductive nonmagnetic metal such as an aluminum alloy in a cylindrical shape, and is concentrically disposed on the outer diameter side of the torque detection uneven portion 39.
- a rear end portion, which is a base end portion of the torque detection sleeve 22, is externally fixed to the cylindrical portion 38.
- a plurality of substantially rectangular window holes 40, 40 are formed in the axial direction in the front end portion or the intermediate portion, which is a portion disposed on the outer diameter side of the torque detection uneven portion 39. It is provided in a row and at equal intervals in the circumferential direction. The circumferential direction phases of the window holes 40 in both rows are shifted from each other by a half pitch.
- the torque detection coil unit 23 is formed in a cylindrical shape, and is concentrically disposed on the outer diameter side of the torque detection uneven portion 39 and the torque detection sleeve 22.
- the torque detection coil unit 23 is fitted and fixed to the housing 11 a and includes a pair of coils 41 and 41. Both the coils 41, 41 are arranged so as to overlap in the radial direction with respect to the portion of the torque detection sleeve 22 provided with the windows 40, 40 in both rows.
- the worm reduction gear 24 is formed by combining a worm wheel 42 and a worm (not shown).
- the worm wheel 42 is externally fitted and fixed to a substantially central portion in the axial direction, which is a portion between the ball bearings 33 and 34 in the output shaft 13a.
- a worm (not shown) is rotatably supported in the housing 11a in a state where it is engaged with the worm wheel 42.
- the electric motor 10 (see FIG. 28) is supported and fixed to the housing 11a.
- the output shaft of the electric motor 10 is coupled to a worm base end (not shown) so that torque can be transmitted.
- the buckling prevention member 37 is externally supported by the spring shaft portion 36 of the torsion bar 14a.
- the buckling prevention member 37 of the present embodiment can elastically (or plastically) expand and contract the width of the cut existing at one place in the circumferential direction, and based on this fact, the inner diameter dimension can be reduced. It can expand and contract elastically (or plastically).
- the torsion bar 14a is inserted from the axial direction into the inner diameter side of the buckling prevention member 37 with the inner diameter dimension of the buckling prevention member 37 expanded, or the width of the cut is expanded as described above. Then, after inserting the spring shaft portion 36 radially into the inner diameter side of the buckling prevention member 37 through the portion between the cuts, the buckling prevention member 37 is attached to the spring shaft portion 36 by reducing the width of the cut. It can be in a state of being supported by external fitting.
- the torsion bar 14a and the buckling prevention member 37 are inserted into the inner diameter side of the output shaft 13a through the rear end opening of the center hole 18a of the output shaft 13a.
- the connecting shaft portion 35a on the front side of the torsion bar 14a is fitted in the connecting hole portion 19a of the output shaft 13a, and the radial direction formed in the portion where the connecting shaft portion 35a and the output shaft 13a are aligned with each other.
- the pin 21a is press-fitted into the through hole 20a.
- the connecting shaft portion 35a is connected to the output shaft 13a in a state where torque can be transmitted and relative displacement in the axial direction is prevented.
- the portion corresponding to the connecting shaft portion 35a and the portion corresponding to the output shaft 13a are simultaneously formed by drilling with the connecting shaft portion 35a being fitted in the connecting hole portion 19a. Alternatively, they may be formed separately before assembly work. Further, as shown in the lower half of FIG. 4, the base end portion of the torque detection sleeve 22 is externally fitted and fixed to the cylindrical portion 38 of the lower shaft 28.
- the rear end portion of the male stopper portion 16 a provided on the outer peripheral surface of the rear end portion of the output shaft 13 a and the inner peripheral surface of the cylindrical portion 38 of the lower shaft 28.
- the front end portion of the female stopper portion 15a provided is engaged with a circumferential gap interposed therebetween, and the rear end edge portion of the connecting shaft portion 35b on the rear side of the torsion bar 14a is connected to the lower shaft 28.
- the connecting hole 17a is engaged with the opening.
- the rear end portion of the male stopper portion 16a and the front end portion of the female stopper portion 15a are engaged with a circumferential clearance interposed therebetween.
- the axial dimension A1 from the opening of the connecting hole 17a to the front end edge of the female stopper 15a is An axial dimension from the rear end edge of the male stopper portion 16a to the rear end edge portion of the connecting shaft portion 35b (amount of protrusion of the connecting shaft portion 35b from the rear end opening of the center hole 18a of the output shaft 13a) B1 Slightly larger (A1> B1).
- the engagement state between the male and female stopper portions 16a and 15a is set to the neutral state with respect to the circumferential direction, so that the mutual rotation direction between the lower shaft 28 and the output shaft 13a can be achieved. Is adjusted to the center position of the predetermined angle range.
- the connecting shaft portion 35b is press-fitted into the connecting hole portion 17a.
- the connecting shaft portion 35b is connected to the lower shaft 28 so that torque can be transmitted.
- the axial reaction force applied to the torsion bar 14a when the connecting shaft portion 35b is press-fitted into the connecting hole portion 17a can be sufficiently supported by the pin 21a.
- the assembly of the remaining components with respect to the components shown in FIGS. 3 to 6 may be performed in an appropriate order, and the specific assembly order is not particularly limited. .
- the electric power steering apparatus configured as described above, when a torque, which is a steering force, is applied to the steering shaft 3a by the driver operating the steering wheel 1, the direction and the magnitude of the torque depend on the torque. Accordingly, the torsion bar 14a is elastically twisted (in a predetermined angle range). Along with this, a change in the circumferential positional relationship between the torque detecting concave-convex portion 39 and the torque detecting sleeve 22 causes an impedance change in the coils 41 and 41 constituting the torque detecting coil unit 23. Therefore, the direction and magnitude of torque can be detected based on this impedance change.
- the electric motor 10 generates auxiliary power corresponding to the direction and magnitude of this torque.
- the auxiliary power is increased by the worm type speed reducer 24 and then applied to the output shaft 13a. As a result, the force required for the driver to operate the steering wheel 1 is reduced.
- a pair of connecting shafts that are both ends in the axial direction of the torsion bar 14a.
- the connecting shaft portion 35b on the side to be connected later to the mating shaft (lower shaft 28, output shaft 13a) is connected to the connecting hole portion 17a of the mating shaft (lower shaft 28).
- the spring shaft portion 36 of the torsion bar 14a can be prevented from buckling. That is, in the case of the present embodiment, a large axial compression force is applied to the spring shaft portion 36 when the connection shaft portion 35b is press-fitted into the connection hole portion 17a.
- the outer peripheral surface of the spring shaft portion 36 is in contact with the inner peripheral surface of the output shaft 13a via the buckling prevention member 37.
- the buckling deformation is prevented by contact.
- the buckling deformation of the spring shaft portion 36 is a deformation in a manner that the spring shaft portion 36 bends in an arcuate shape.
- the axial direction center part of the outer peripheral surface of the spring shaft part 36 (the part where the amount of displacement in the radial direction becomes maximum when the spring shaft part 36 is buckled).
- the buckling prevention member 37 is externally supported by the part including For this reason, when the connecting shaft portion 35b is press-fitted into the connecting hole portion 17a, the radial displacement of the central portion in the axial direction of the spring shaft portion 36 can be sufficiently suppressed by the buckling prevention member 37. Therefore, buckling deformation of the spring shaft portion 36 can be efficiently prevented.
- the spring preventing member 37 is provided with a spring so as to sufficiently prevent buckling of the spring shaft portion 36 even at a portion corresponding to the cut in the circumferential direction.
- the width of the cut of the buckling prevention member 37 is as small as possible.
- FIG. 9 A second embodiment of the present invention will be described with reference to FIGS. 7 to 9, the left side is the front side and the right side is the rear side.
- the structure for connecting the connecting shaft portion 35c on the front side of the torsion bar 14b to the output shaft 13b so as to transmit torque is the same as that of the first embodiment described above. Different from the case. That is, in the case of this embodiment, in order to connect the connecting shaft portion 35c to the output shaft 13b so that torque can be transmitted, the connecting shaft portion 35c is provided at the front end portion of the center hole 18b of the output shaft 13b. It press-fits into the connecting hole 19b.
- the male serration provided on the outer peripheral surface of the connecting shaft portion 35c and subjected to hardening treatment such as quenching is machined on the cylindrical inner peripheral surface of the connecting hole portion 19b which has not been hardened. I'm trying to cut it in.
- the torsion bar 14b is inserted into the inner diameter side of the output shaft 13b, and the front end edge portion of the connecting shaft portion 35c on the front side of the torsion bar 14b is connected to the output shaft 13b.
- the rear end opening of the hole 19b is engaged.
- the rear end portion of the male stopper portion 16a provided on the outer peripheral surface of the rear end portion of the output shaft 13b, and the front end portion of the female stopper portion 15a provided on the inner peripheral surface of the cylindrical portion 38 of the lower shaft 28 Are engaged with a gap in the circumferential direction interposed.
- the engagement state between the male and female stopper portions 16a and 15a is set to the neutral state in the circumferential direction, so that each other in the rotational direction of the lower shaft 28 and the output shaft 13b. Is adjusted to the center position of a predetermined angle range in which the relative rotation between the lower shaft 28 and the output shaft 13b is possible.
- the connecting shaft portion 35c is press-fitted into the connecting hole portion 19b.
- the connecting shaft portion 35c is connected to the output shaft 13b so that torque can be transmitted.
- the axial reaction force applied to the torsion bar 14b when the connecting shaft portion 35c is press-fitted into the connecting hole portion 19b is sufficiently supported by the rear end portion of the connecting hole portion 17a of the output shaft 13b. it can.
- a pair of connecting shafts that are both ends in the axial direction of the torsion bar 14b.
- the connecting shaft portion 35c on the side to be connected later to the mating shaft (lower shaft 28, output shaft 13b) is connected to the connecting hole portion 19b of the mating shaft (output shaft 13b).
- the spring shaft portion 36 of the torsion bar 14b can be prevented from buckling. That is, in the case of the present embodiment, a large axial compression force is applied to the spring shaft portion 36 when the connection shaft portion 35c is press-fitted into the connection hole portion 19b.
- the outer peripheral surface of the spring shaft portion 36 is in contact with the inner peripheral surface of the output shaft 13a via the buckling prevention member 37.
- the buckling deformation is prevented by contact.
- the axial ends of the male and female stoppers 16a and 15a are connected to each other prior to press-fitting the coupling shaft 35c into the coupling hole 19b. Therefore, it is easy to match the positional relationship of the lower shaft 28 and the output shaft 13b with respect to the rotation direction to the center position of the predetermined angle range. Therefore, a normal assembly state can be easily realized.
- the connecting shaft portion 35c and the output shaft 13b are coupled and fixed by welding after the front connecting shaft portion 35c is press-fitted into the connecting hole portion 19b of the output shaft 13b. You can also.
- Other configurations and operations are the same as in the case of the first embodiment described above, and thus overlapping illustrations and descriptions are omitted.
- FIG. 10 shows a third embodiment of the present invention.
- the axial dimension of the buckling prevention member 37a that is externally supported on the outer peripheral surface of the spring shaft portion 36 of the torsion bar 14a (or 14b) is set to be greater than that of the first and second embodiments described above. Is also short (about 1/3 in length).
- the buckling prevention member 37a is being fixed to the outer peripheral surface of the spring axial part 36 with the adhesive agent in the state fitted by the axial direction center part of the outer peripheral surface of the spring axial part 36. As shown in FIG. This prevents the buckling prevention member 37a from being displaced in the axial direction with respect to the spring shaft portion 36 during assembly.
- FIG. 11 shows a fourth embodiment of the present invention.
- the axial dimension of the buckling prevention member 37b that is externally supported by the outer peripheral surface of the spring shaft part 36 of the torsion bar 14a (or 14b) is set to 1 / axis of the axial dimension of the spring shaft part 36. It is larger (just a little) than 2.
- FIG. 12 shows a fifth embodiment of the present invention.
- a plurality (four in the illustrated example) of buckling prevention members 37c and 37c having short axial dimensions are provided on the outer peripheral surface of the spring shaft portion 36 of the torsion bar 14a (or 14b).
- the outer fitting is supported side by side in the axial direction.
- the number of buckling prevention members 37c, 37c is not particularly limited. Further, the axial dimensions of the buckling prevention members 37c, 37c can be different from each other.
- the buckling prevention members 37c and 37c may be capable of relative displacement in the axial direction with respect to the outer peripheral surface of the spring shaft portion 36, or may be fixed with an adhesive or the like.
- only one buckling prevention member 37c having a short axial dimension as described above is fitted to the outer peripheral surface of the spring shaft portion 36 so as to allow relative displacement in the axial direction. Even if it is only supported, a certain effect (the effect of preventing buckling of the spring shaft portion) can be obtained to some extent.
- Other configurations and operations are the same as those in the first or second embodiment described above, and thus overlapping illustrations and descriptions are omitted.
- FIG. 13 shows a sixth embodiment of the present invention.
- the cut provided in the buckling prevention member 37d that is externally fitted to the outer peripheral surface of the spring shaft portion 36 of the torsion bar 14a (or 14b) is inclined with respect to the central axis of the buckling prevention member 37d. It is made (spiral).
- the structure of the buckling prevention member 37d is a structure like a spiral tube in which a strip-shaped material is spirally wound into a tube shape.
- the buckling prevention member 37d has a structure in which the inner diameter dimension can be enlarged or reduced based on the presence of the cut, but the buckling prevention member 37d has a shape closed over the entire circumference. Therefore, buckling of the spring shaft portion 36 can be sufficiently prevented at any position in the circumferential direction.
- the buckling prevention member is as shown in FIGS. Arrangement configuration can be adopted. Other configurations and operations are the same as those in the first or second embodiment described above, and thus overlapping illustrations and descriptions are omitted.
- FIG. 14 shows a seventh embodiment of the present invention.
- the buckling prevention member 37e that is externally fitted and supported on the outer peripheral surface of the spring shaft portion 36 of the torsion bar 14a (or 14b) is constituted by a cylindrical heat-shrinkable tube that does not break all around. is doing. That is, in the case of the present embodiment, when the buckling prevention member 37e is externally supported on the outer peripheral surface of the spring shaft portion 36, first, as shown in FIGS.
- a cylindrical buckling prevention member 37e is prepared which is larger than the outer diameter dimension of the pair of connecting shaft portions 35a (or 35c) and 35b which are both ends in the axial direction of the torsion bar 14a (or 14b).
- the spring shaft portion 36 of the torsion bar 14a (or 14b) is inserted into the inner diameter side of the buckling prevention member 37e.
- the buckling prevention member 37e is heated and contracted, so that the inner circumferential surface of the buckling prevention member 37e becomes the outer circumference of the spring shaft portion 36, as shown in FIGS.
- the buckling prevention member 37e is externally supported by the outer peripheral surface of the spring shaft portion 36 by closely contacting the surface.
- the buckling prevention member 37e of this embodiment which is a heat-shrinkable tube
- polyolefin, a fluoropolymer, a thermoplastic elastomer etc. as a main raw material can be used, for example.
- the buckling prevention member is constituted by a heat shrinkable tube as in this embodiment
- the buckling prevention member is as shown in FIGS. Arrangement configuration can be adopted.
- Other configurations and operations are the same as those in the first or second embodiment described above, and thus overlapping illustrations and descriptions are omitted.
- FIG. 15 shows an eighth embodiment of the present invention.
- the buckling prevention member 37f that is externally fitted or supported and fixed to the outer peripheral surface of the spring shaft portion 36 of the torsion bar 14a (or 14b) is a cylindrical synthetic resin that is continuous and unbroken around the entire periphery. It is made of material.
- the buckling prevention member 37f is injection-molded on the outer diameter side of the spring shaft portion 36 so that the buckling prevention member 37f is externally supported or coupled to the outer peripheral surface of the spring shaft portion 36. It is in a fixed state.
- Other configurations and operations are the same as those in the first or second embodiment described above, and thus overlapping illustrations and descriptions are omitted.
- FIG. 16 shows a ninth embodiment of the present invention.
- the buckling prevention member 37g that is externally supported or coupled and fixed to the outer peripheral surface of the spring shaft portion 36 of the torsion bar 14a (or 14b) is disposed only in the central portion in the axial direction.
- Other configurations and operations are the same as those in the above-described eighth embodiment.
- FIG. 17 shows a tenth embodiment of the present invention.
- the buckling prevention members 37h and 37h that are externally supported or coupled and fixed to the outer peripheral surface of the spring shaft portion 36 of the torsion bar 14a (or 14b) are disposed only at two locations near the center in the axial direction. is doing.
- Other configurations and operations are the same as those in the above-described eighth embodiment.
- FIG. 18 shows an eleventh embodiment of the present invention.
- belt-shaped buckling prevention members 37i and 37i that are long in the axial direction at four locations that are equidistant in the circumferential direction on the outer peripheral surface of the spring shaft portion 36 of the torsion bar 14a (or 14b). Is fixed.
- the formation of the buckling prevention members 37i, 37i and the coupling and fixing to the outer peripheral surface of the spring shaft portion 36 are performed by injection molding the buckling prevention members 37i, 37i on the outer diameter side of the spring shaft portion 36.
- the buckling prevention member can be reduced in weight as compared with the case where a cylindrical member with the entire circumference connected is employed as the buckling prevention member.
- each buckling prevention member can be used even when a configuration in which buckling prevention members are coupled and fixed at a plurality of locations in the circumferential direction of the outer peripheral surface of the spring shaft portion as in the present embodiment.
- FIGS it is possible to employ an arrangement as shown in FIGS.
- Other configurations and operations are the same as those in the first or second embodiment described above, and thus overlapping illustrations and descriptions are omitted.
- FIG. 19 shows a twelfth embodiment of the present invention.
- the buckling prevention member 37j that is externally supported or coupled and fixed to the outer peripheral surface of the spring shaft portion 36 of the torsion bar 14a (or 14b) is made of a cylindrical rubber that is not cut off all around. It is a member.
- the buckling prevention member 37j is formed on the outer diameter side of the spring shaft portion 36, and at the same time, the buckling prevention member 37j is vulcanized and bonded to the outer peripheral surface of the spring shaft portion 36. Yes.
- this buckling prevention member when adopting a configuration in which a rubber buckling prevention member is vulcanized and bonded to the outer peripheral surface of the spring shaft portion, this buckling prevention member
- the arrangement configuration shown in FIGS. 16 to 18 can also be adopted.
- Other configurations and operations are the same as those in the first or second embodiment described above, and thus overlapping illustrations and descriptions are omitted.
- a guide shaft that is concentric with the connecting shaft portion 35d and smaller in diameter than the connecting shaft portion 35d is adjacent to the distal end side (left side in FIG. 20) of the connecting shaft portion 35d.
- a portion 43 is provided.
- the outer peripheral surface of the guide shaft 43 is cylindrical except for the chamfered portion at the tip. Then, by inserting the guide shaft portion 43 into the connecting hole portion 19c without giving a tightening margin, the connecting shaft portion 35d is aligned with the connecting hole portion 19c, thereby connecting the connecting shaft to the connecting hole portion 19c.
- the press-fitting of the part 35d can be guided.
- the entire outer peripheral surface of the guide shaft portion 43 can be tapered (tapered) with a smaller diameter dimension toward the left side in FIG. 20.
- a guide hole that is concentric with the connection hole 19c and larger in diameter than the connection hole 19c is formed in a portion adjacent to the inlet side (right side in FIG. 21) of the connection hole 19c.
- a portion 44 is provided.
- the inner peripheral surface of the guide hole portion 44 is cylindrical except for a continuous portion with the connecting hole portion 19c.
- the diameter dimension of the inner peripheral surface of the guide hole portion 44a provided in the portion adjacent to the inlet side (right side in FIG. 22) of the connecting hole portion 19c increases toward the left side in FIG.
- the example shown in FIG. 23 is an example provided with both the guide shaft portion 43 described in FIG. 20 and the guide hole portion 44 described in FIG.
- at least one of the outer peripheral surface of the guide shaft portion 43 and the inner peripheral surface of the guide hole portion 44 has a smaller diameter dimension toward the left side in FIG. It can also be made into a tapered shape.
- FIG. 24 shows a thirteenth embodiment of the present invention.
- the sliding bush insertion hole 51 is provided at the lower shaft side end portion of the center hole 18b of the output shaft 13b, and the sliding bush 52 is inserted (press-fitted) there.
- the sliding bush 52 is inserted (press-fitted) there.
- the following effects can be obtained. That is, when the sliding bush 52 is not provided at the tip of the output shaft 13b on the lower shaft 28 side, the rotation of the lower shaft 28 accompanying the rotation of the steering wheel 4 causes the female stopper portion 15a of the lower shaft 28 to move to the output shaft.
- the sliding bush 52 is inserted into the lower end of the output shaft 13b on the lower shaft 28 side, and the connecting shaft portion 35b of the torsion bar 14b is supported by the sliding bush 52, whereby the female stopper portion 15a of the lower shaft 28 is provided. It is possible to eliminate a possibility that a phenomenon of swinging in the radial direction occurs with respect to the male stopper portion 16a of the output shaft 13b. As a result, there is no possibility of adversely affecting the detection accuracy of the torque sensor.
- Other configurations and operations are the same as in the case of the second embodiment described above, so overlapping illustrations and descriptions are omitted.
- FIGS. 25 to 27 A fourteenth embodiment of the present invention will be described with reference to FIGS. 25 to 27, the left side is the front side and the right side is the rear side.
- the order of assembling the lower shaft 28, the output shaft 13b, and the torsion bar 14b is different from the case of the second embodiment described above. That is, in the case of this embodiment, first, as shown in FIG. 25, the base end portion of the torque detection sleeve 22 is externally fixed to the cylindrical portion 38 of the lower shaft 28.
- the rear end portion of the male stopper portion 16a provided on the outer peripheral surface of the rear end portion of the output shaft 13b, and the front end portion of the female stopper portion 15a provided on the inner peripheral surface of the cylindrical portion 38 of the lower shaft 28, are engaged with a gap in the circumferential direction interposed.
- the male stopper portion 16a and the female stopper portion 15a are engaged, the lower shaft 28 and the output shaft 13b are respectively fixed by a jig (not shown).
- the mutual positional relationship in the rotational direction of the lower shaft 28 and the output shaft 13b is set within a predetermined angular range.
- the distance from the rear end portion of the output shaft 13b to the opening portion of the connecting hole portion 17a is the output shaft generated when the torsion bar 14b is press-fitted into the lower shaft 28 and the output shaft 13b.
- the distance between the rear end of 13b and the opening of the connecting hole 17a is maintained at the same distance C.
- a buckling prevention member 37 is disposed on the outer peripheral surface of the spring shaft portion.
- the torsion bar 14b is inserted into the center hole 18b of the torsion bar 14b from the front end side of the output shaft 13b, and the connecting shaft portion 35b of the torsion bar 14b is engaged with the opening portion of the connecting hole portion 17a of the lower shaft 28.
- the connecting shaft portion 35b is press-fitted into the connecting hole portion 17a and the connecting shaft portion 35c is press-fitted into the connecting hole portion 19b.
- the connecting shaft portion 35b is connected to the lower shaft 28, and the connecting shaft portion 35c is connected to the output shaft 13b so as to be able to transmit torque.
- a method of externally supporting or coupling and fixing a buckling prevention member made of synthetic resin to the outer peripheral surface of the spring shaft portion a method of injection molding on the outer diameter side of the spring shaft portion is used.
- a method of adhering and melting synthetic resin powder on the outer peripheral surface of the spring shaft portion, or a method of attaching the outer peripheral surface of the spring shaft portion to the melted synthetic resin can be employed.
- this one connecting shaft portion is press-fitted into the inner diameter side of the buckling prevention member, and this inner diameter side is further moved in the axial direction.
- the peak portions of the serrations and splines bite into the inner peripheral surface of the buckling prevention member, and the elastic diameter expansion amount of the buckling prevention member is suppressed, so that the force required for the passage can be suppressed.
- the buckling prevention member is made of metal in the case of carrying out the present invention, it is synthesized on the portion of the inner and outer peripheral surfaces of the buckling prevention member that is in sliding contact with the peripheral surface of the mating member during use. It can also be coated with a low friction material such as resin. If such a configuration is employed, the spring constant of the spring shaft portion is unlikely to change during use.
- the present invention can be implemented by appropriately combining the structures of the respective embodiments as described above.
- the assembling method of the present invention when the buckling prevention member is disposed between the outer peripheral surface of the spring shaft portion of the torsion bar and the inner peripheral surface of the first shaft, the spring shaft of the torsion bar A method of inserting the torsion bar and the buckling prevention member into the inner diameter side of the first shaft after the buckling prevention member is externally supported or coupled and fixed to the outer peripheral surface of the first portion, or the first shaft A method of inserting a spring shaft portion of a torsion bar into the inner diameter side of the buckling prevention member after inserting the buckling prevention member into the inner diameter side of the spring may be adopted.
- a gap is usually present between the inner peripheral surface of the buckling prevention member and the outer peripheral surface of the spring shaft portion.
- the present invention can also be applied to a structure in which the first shaft is used as an input shaft to which a steering force is applied from a steering wheel, as in the structure described in Patent Document 2, for example.
- the present invention can also be applied to a structure in which an assist mechanism including the first and second shafts and the torsion bar is installed in the steering gear unit portion.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- Electromagnetism (AREA)
- Power Steering Mechanism (AREA)
- Steering Controls (AREA)
Abstract
Description
尚、本明細書で、前後方向は、特に断らない限り、車両の前後方向を言う。
但し、この場合には、トーションバー14の後端部を入力軸12の連結孔部17に圧入する際に、トーションバー14の軸方向中間部であるばね軸部に、大きな軸方向圧縮力が加わる。この為、この大きな軸方向圧縮力によってばね軸部が座屈するのを防止すべく、ばね軸部の剛性を高くしておく必要がある。ところが、ばね軸部の剛性を高くすると、その分、ばね軸部を通じて、操舵輪側からステアリングホイール4側へ振動が伝わり易くなると共に、操舵トルクの検出感度が低くなると言った不都合を生じる。
但し、この場合には、トーションバー14の両端部を2つの連結孔部17、19に対して順番に圧入する事になる為、後から行う圧入の際に、先に圧入した側の端部を後から圧入する側の端部に向けて軸方向に押圧する様な態様で圧入を行うと、トーションバー14のばね軸部に大きな軸方向圧縮力が加わる。この為、上述した場合と同様の不都合を生じる。
中空状の第一シャフトと、
該第一シャフトと同軸に配置された第二シャフトと、
軸方向両端部に設けられた1対の連結軸部と、該1対の連結軸部間に設けられたばね軸部と、を有し、且つ、前記第一シャフトの内径側に配置されると共に、一方の前記連結軸部を前記第一シャフトに、他方の前記連結軸部を前記第二シャフトに、それぞれトルク伝達可能に連結されたトーションバーと、
を備え、
少なくとも一方の前記連結軸部は、前記第一、及び前記第二シャフトのうち、自身が連結される相手側シャフトに設けられた連結孔部に圧入され、
前記第一、及び前記第二シャフトの何れか一方のシャフトにステアリングホイールからの操舵力が付与される。
特に、本発明の電動式パワーステアリング装置の場合には、前記ばね軸部の外周面に座屈防止部材が外嵌支持(外嵌固定を含む)又は結合固定されており、前記座屈防止部材の外周面が前記第一シャフトの内周面に近接若しくは接触している。
又、ステアリングホイールの動きを操舵輪に伝達する操舵力伝達機構の途中に設けられる他の部材(例えば、前記第一、及び第二シャフトのうちの他方のシャフトや、ステアリングギヤユニットを構成するラック軸)には、電動モータを発生源とする補助動力が付与される。
或いは、前記座屈防止部材を、円筒状の熱収縮チューブとする事もできる。
或いは、前記座屈防止部材を、前記ばね軸部の外径側で射出成形された合成樹脂製部材とする事もできる。
或いは、前記座屈防止部材を、前記ばね軸部の外周面に加硫接着されたゴム製部材とする事もできる。
又、前記一方の連結軸部を、前記第一シャフトに対し、トルク伝達可能に且つ軸方向の相対変位を阻止された状態で連結する。尚、この様な連結を実現する為に、例えば、前記一方の連結軸部を、前記第一シャフトに設けられた連結孔部に内嵌した状態で、一方の連結軸部と第一シャフトとの互いに整合する位置に設けられた径方向の貫通孔にピンを圧入したり、又は、一方の連結軸部と第一シャフトとを溶接若しくは接着したり、又は、一方の連結軸部と第一シャフトとの係合部を塑性変形させる(かしめる)。
又、前記他方の連結軸部を、前記第二シャフトに設けられた連結孔部に対して圧入する。
更に、組立時に、前記トーションバーのばね軸部の外周面と前記第一シャフトの内周面との間に前記座屈防止部材を配置すると共に、前記一方の連結軸部を前記第一シャフトに対してトルク伝達可能に且つ軸方向の相対変位を阻止した状態で連結した後、前記他方の連結軸部を前記第二シャフトに設けられた連結孔部に対して圧入する前に、前記第一、及び第二ストッパ部の少なくとも一部分同士を円周方向の隙間を介在させた状態で係合させる事が可能な寸法関係を持たせる。
又、前記一方の連結軸部を、前記第一シャフトに設けられた連結孔部に対して圧入する。
又、前記他方の連結軸部を、前記第二シャフトに設けられた連結孔部に対して圧入すると共に、前記連結孔部の奥端部に突き当てる。
更に、組立時に、前記他方の連結軸部を前記第二シャフトに設けられた連結孔部に対して圧入すると共に前記連結孔部の奥端部に突き当てた状態で、前記トーションバーのばね軸部の外周面と前記第一シャフトの内周面との間に前記座屈防止部材を配置した後、前記一方の連結軸部を前記第一シャフトに設けられた連結孔部に対して圧入する前に、前記第一、及び第二ストッパ部の少なくとも一部分同士を円周方向の隙間を介在させた状態で係合させる事が可能な寸法関係を持たせる。
又、前記一方の連結軸部を、前記第一シャフトに設けられた連結孔部に対して圧入する。
又、前記他方の連結軸部を、前記第二シャフトに設けられた連結孔部に対して圧入すると共に、前記連結孔部の奥端部に突き当てる。
更に、組立時に、前記座屈防止部材が配置された前記トーションバーを前記第一シャフトの内径側に挿入し、前記他方の連結軸部を前記第二シャフトに設けられた連結孔部に対して圧入しつつ、前記連結孔部の奥端部に突き当てた状態にすると共に、前記一方の連結軸部を前記第一シャフトに設けられた連結孔部に対して圧入する、前記両方の連結軸部の圧入前に、前記第一、及び第二ストッパ部の少なくとも一部分同士を円周方向の隙間を介在させた状態で係合させる事が可能な寸法関係を持たせる。
即ち、本発明の場合、トーションバーの連結軸部を、相手側シャフトに設けられた連結孔部に対して圧入する際には、ばね軸部に大きな軸方向圧縮力が加わる場合がある。但し、この大きな軸方向圧縮力によって、ばね軸部が座屈変形しようとしても、座屈防止部材の外周面が第一シャフトの内周面に接触している又は接触する事により、当該座屈変形が防止される。
又、本発明の場合には、この様にして、ばね軸部の座屈変形を防止できる為、操舵輪からステアリングホイールへ伝達される振動を低減する事や、操舵トルクの検出感度を向上させる事を目的として、トーションバーの低剛性化(ばね軸部の小径化等)を図り易い。
本発明の第1実施形態に就いて、図1~6を参照しつつ説明する。尚、図1~6では、左側が前側となり、右側が後側となる。本実施形態の電動式パワーステアリング装置は、ステアリングコラム2aと、ステアリングシャフト3aと、ハウジング11aと、出力軸13aと、トーションバー14aと、座屈防止部材37と、トルク検出用スリーブ22と、トルク検出用コイルユニット23と、電動モータ10(図28参照)と、ウォーム式減速機24とを備える。
また、本実施形態の構造を実施する場合、図3~6に示した各構成部材に対する、残りの各構成部材の組み立ては、適宜の順序で行えば良く、具体的な組立順序は特に問わない。
本発明の第2実施形態に就いて、図7~9を参照しつつ説明する。尚、図7~9では、左側が前側となり、右側が後側となる。
本実施形態の場合には、図9に示す様に、トーションバー14bの前側の連結軸部35cを出力軸13bに対してトルク伝達可能に連結する為の構造が、上述した第1実施形態の場合と異なる。即ち、本実施形態の場合には、連結軸部35cを出力軸13bに対してトルク伝達可能に連結する為に、連結軸部35cを、出力軸13bの中心孔18bの前端部に設けられた連結孔部19bに圧入している。これにより、連結軸部35cの外周面に設けられた、焼き入れ等の硬化処理を施された雄セレーションを、硬化処理が施されていない、連結孔部19bの円筒状の内周面に機械的に食い込ませている。
尚、本実施形態の構造を実施する場合には、前側の連結軸部35cを出力軸13bの連結孔部19bに圧入した後、連結軸部35cと出力軸13bとを溶接により結合固定する事もできる。
その他の構成及び作用は、上述した第1実施形態の場合と同様であるから、重複する図示並びに説明は省略する。
図10は、本発明の第3実施形態を示している。本実施形態の場合には、トーションバー14a(又は14b)のばね軸部36の外周面に外嵌支持する座屈防止部材37aの軸方向寸法を、上述した第1~2実施形態の場合よりも短く(1/3程度の長さと)している。そして、座屈防止部材37aは、ばね軸部36の外周面の軸方向中央部分に外嵌した状態で、ばね軸部36の外周面に接着剤で固定されている。これにより、組み立ての際に、座屈防止部材37aがばね軸部36に対して軸方向に変位するのを防止している。
その他の構成及び作用は、上述した第1又は第2実施形態の場合と同様であるから、重複する図示並びに説明は省略する。
図11は、本発明の第4実施形態を示している。本実施形態の場合には、トーションバー14a(又は14b)のばね軸部36の外周面に外嵌支持した座屈防止部材37bの軸方向寸法を、ばね軸部36の軸方向寸法の1/2よりも(少しだけ)大きくしている。これにより、座屈防止部材37bがばね軸部36の外径側で、如何なる軸方向位置に変位した場合でも、常に、座屈防止部材37bの軸方向一部分が、ばね軸部36の外周面の軸方向中央部の外径側に位置する様にしている。
その他の構成及び作用は、前述した第1又は第2実施形態の場合と同様であるから、重複する図示並びに説明は省略する。
図12は、本発明の第5実施形態を示している。本実施形態の場合には、トーションバー14a(又は14b)のばね軸部36の外周面に、軸方向寸法の短い複数個(図示の例では4個)の座屈防止部材37c、37cを、軸方向に並べて外嵌支持している。
その他の構成及び作用は、前述した第1又は第2実施形態の場合と同様であるから、重複する図示並びに説明は省略する。
図13は、本発明の第6実施形態を示している。本実施形態の場合には、トーションバー14a(又は14b)のばね軸部36の外周面に外嵌支持する座屈防止部材37dに設ける切れ目を、座屈防止部材37dの中心軸に対して傾斜させている(螺旋状にしている)。これにより、座屈防止部材37dの構成を、帯状素材を螺旋状に巻いてチューブ状としたスパイラルチューブの如き構成としている。本実施形態の場合には、座屈防止部材37dが、切れ目の存在に基づいて内径寸法を拡縮可能とした構造でありながら、座屈防止部材37dが全周に亙り閉じた形状を有している為、円周方向に関する何れの位置でも、ばね軸部36の座屈を十分に防止できる。
その他の構成及び作用は、前述した第1又は第2実施形態の場合と同様であるから、重複する図示並びに説明は省略する。
図14は、本発明の第7実施形態を示している。本実施形態の場合には、トーションバー14a(又は14b)のばね軸部36の外周面に外嵌支持する座屈防止部材37eを、全周に亙り切れ目のない円筒状の熱収縮チューブにより構成している。即ち、本実施形態の場合、ばね軸部36の外周面に座屈防止部材37eを外嵌支持する際には、先ず、図14(A)及び(B)に示す様に、その内径寸法が、トーションバー14a(又は14b)の軸方向両端部である1対の連結軸部35a(又は35c)、35bの外径寸法よりも大きい、熱収縮前の円筒状の座屈防止部材37eを用意すると共に、座屈防止部材37eの内径側に、トーションバー14a(又は14b)のばね軸部36を挿通する。そして、この状態で、座屈防止部材37eを加熱して収縮させる事により、図14(C)及び(D)に示す様に、座屈防止部材37eの内周面をばね軸部36の外周面に密着させる事で、座屈防止部材37eを、ばね軸部36の外周面に外嵌支持した状態とする。尚、熱収縮チューブである、本実施形態の座屈防止部材37eの材料としては、例えば、ポリオレフィン、フッ素系ポリマー、熱可塑性エラストマー等が主原料となるものを使用できる。
その他の構成及び作用は、前述した第1又は第2実施形態の場合と同様であるから、重複する図示並びに説明は省略する。
図15は、本発明の第8実施形態を示している。本実施形態の場合には、トーションバー14a(又は14b)のばね軸部36の外周面に外嵌支持又は結合固定する座屈防止部材37fを、全周に亙り切れ目のない円筒状の合成樹脂製部材としている。特に、本例の場合には、ばね軸部36の外径側で座屈防止部材37fを射出成形する事により、ばね軸部36の外周面に、座屈防止部材37fを外嵌支持又は結合固定した状態としている。
その他の構成及び作用は、前述した第1又は第2実施形態の場合と同様であるから、重複する図示並びに説明は省略する。
図16は、本発明の第9実施形態を示している。本実施形態の場合には、トーションバー14a(又は14b)のばね軸部36の外周面に外嵌支持又は結合固定した座屈防止部材37gを、軸方向中央部分にのみ配置している。
その他の構成及び作用は、上述した第8実施形態の場合と同様である。
図17は、本発明の第10実施形態を示している。本実施形態の場合には、トーションバー14a(又は14b)のばね軸部36の外周面に外嵌支持又は結合固定した座屈防止部材37h、37hを、軸方向中央寄りの2箇所にのみ配置している。
その他の構成及び作用は、上述した第8実施形態の場合と同様である。
図18は、本発明の第11実施形態を示している。本実施形態の場合には、トーションバー14a(又は14b)のばね軸部36の外周面の円周方向等間隔となる4箇所に、それぞれが軸方向に長い帯状の座屈防止部材37i、37iを結合固定している。本実施形態の場合、各座屈防止部材37i、37iの成形とばね軸部36の外周面に対する結合固定とは、ばね軸部36の外径側で各座屈防止部材37i、37iを射出成形する事により、同時に行う。この様な構成を有する本実施形態の場合には、座屈防止部材として全周がつながった円筒状のものを採用する場合に比べて、この座屈防止部材の軽量化を図れる。
その他の構成及び作用は、前述した第1又は第2実施形態の場合と同様であるから、重複する図示並びに説明は省略する。
図19は、本発明の第12実施形態を示している。本実施形態の場合には、トーションバー14a(又は14b)のばね軸部36の外周面に外嵌支持又は結合固定する座屈防止部材37jを、全周に亙り切れ目のない円筒状のゴム製部材としている。特に、本実施形態の場合には、ばね軸部36の外径側で座屈防止部材37jを成形するのと同時に、座屈防止部材37jをばね軸部36の外周面に加硫接着している。
その他の構成及び作用は、前述した第1又は第2実施形態の場合と同様であるから、重複する図示並びに説明は省略する。
尚、図20に示した例に関して、案内軸部43の外周面は、その全体を、図20の左側に向かう程径寸法が小さくなる(先細りの)テーパ状とする事もできる。
尚、図23に示した例に関して、案内軸部43の外周面と、案内孔部44の内周面とのうちの少なくとも一方は、その全体を、図23の左側に向かう程径寸法が小さくなるテーパ状とする事もできる。
図24は、本発明の第13実施形態を示している。本実施形態の場合には、出力軸13bの中心孔18bのロアシャフト28側先端部に滑りブッシュ挿入穴51を設け、そこに滑りブッシュ52を挿入(圧入)している点が、上述した第2実施形態の場合と異なる。滑りブッシュ52を出力軸13bのロアシャフト28側先端部に設けることによって、以下の効果が得られる。
即ち、滑りブッシュ52を出力軸13bのロアシャフト28側先端部に設けない場合には、ステアリングホイール4の回転に伴なうロアシャフト28の回転によって、ロアシャフト28の雌ストッパ部15aが出力軸13bの雄ストッパ部16aに対して径方向に振れる現象が生じる可能性がある。その結果トルクセンサーの検出精度に悪影響を及ぼす恐れがある。
本実施形態の様に出力軸13bのロアシャフト28側先端部に滑りブッシュ52挿入し、滑りブッシュ52でトーションバー14bの連結軸部35bを支持することによって、ロアシャフト28の雌ストッパ部15aが出力軸13bの雄ストッパ部16aに対して、径方向に振れる現象が生じる虞をなくすことができる。その結果トルクセンサーの検出精度に悪影響を及ぼす虞がなくなる。
その他の構成及び作用は、上述した第2実施形態の場合と同様であるから、重複する図示並びに説明は省略する。
本発明の第14実施形態に就いて、図25~27を参照しつつ説明する。尚、図25~27では、左側が前側となり、右側が後側となる。
本実施形態の場合には、図25~27に示す様に、ロアシャフト28と、出力軸13bと、トーションバー14bとを組み立てる順序が、上述した第2実施形態の場合と異なる。
即ち、本実施形態の場合には、先ず、図25に示す様に、ロアシャフト28の筒状部38に、トルク検出用スリーブ22の基端部を外嵌固定する。次に、出力軸13bの後端部外周面に設けられた雄ストッパ部16aの後端部と、ロアシャフト28の筒状部38の内周面に設けられた雌ストッパ部15aの前端部とを、円周方向の隙間を介在させた状態で係合させる。雄ストッパ部16aと雌ストッパ部15aとの係合の際には、図示しない治具によってロアシャフト28と出力軸13bとをそれぞれ固定して行う。
この場合、出力軸13bの後端部から連結孔部17aの開口部までの距離を、図27に示す様に、トーションバー14bをロアシャフト28と出力軸13bとに圧入した時に生じる、出力軸13bの後端部と連結孔部17aの開口部間の距離Cと同じ距離に維持する。
そして、この状態で、図26→図27の順に示す様に、連結軸部35bを連結孔部17aに、連結軸部35cを連結孔部19bに圧入する。これにより、連結軸部35bをロアシャフト28に対して、連結軸部35cを出力軸13bに対してトルク伝達可能に連結する。
その他の構成及び作用は、上述した第2実施形態の場合と同様であるから、重複する図示並びに説明は省略する。
又、本発明の組立方法を実施する場合に、トーションバーのばね軸部の外周面と第一シャフトの内周面との間に座屈防止部材を配置する際には、トーションバーのばね軸部の外周面に座屈防止部材を外嵌支持又は結合固定した後、トーションバー及び座屈防止部材を第一シャフトの内径側に挿入する方法を採用しても良いし、或いは、第一シャフトの内径側に座屈防止部材を挿入した後、この座屈防止部材の内径側にトーションバーのばね軸部を挿入する方法を採用しても良い。後者の方法を採用する場合には、通常、座屈防止部材の内周面とばね軸部の外周面との間に隙間が存在した状態となる。
又、本発明は、第一、及び第二シャフトとトーションバーとを含んで構成されるアシスト機構を、ステアリングギヤユニット部分に設置する構造に対して適用する事もできる。
本発明を詳細にまた特定の実施態様を参照して説明したが、本発明の精神と範囲を逸脱することなく様々な変更や修正を加えることができることは当業者にとって明らかである。
2、2a ステアリングコラム
3、3a ステアリングシャフト
4 ステアリングホイール
5a、5b 自在継手
6 中間シャフト
7 ステアリングギヤユニット
8 入力軸
9 タイロッド
10 電動モータ
11、11a ハウジング
12 入力軸
13、13a、13b 出力軸
14、14a、14b トーションバー
15、15a 雌ストッパ部
16、16a 雄ストッパ部
17、17a 連結孔部
18、18a、18b 中心孔
19、19a、19b、19c 連結孔部
20、20a 貫通孔
21、21a ピン
22 トルク検出用スリーブ
23 トルク検出用コイルユニット
24 ウォーム式減速機
25 インナコラム
26 アウタコラム
27 支持ブラケット
28 ロアシャフト
29 アッパシャフト
30 蓋体
31 本体
32 ボルト
33 玉軸受
34 玉軸受
35a、35b、35c、35d 連結軸部
36 ばね軸部
37、37a~37j 座屈防止部材
38 筒状部
39 トルク検出用凹凸部
40 窓孔
41 コイル
42 ウォームホイール
43 案内軸部
44、44a 案内孔部
51 滑りブッシュ挿入穴
52 滑りブッシュ
Claims (13)
- 中空状の第一シャフトと、
該第一シャフトと同軸に配置された第二シャフトと、
軸方向両端部に設けられた1対の連結軸部と、該1対の連結軸部間に設けられたばね軸部と、を有し、且つ、前記第一シャフトの内径側に配置されると共に、一方の前記連結軸部を前記第一シャフトに、他方の前記連結軸部を前記第二シャフトに、それぞれトルク伝達可能に連結されたトーションバーと、
を備え、
少なくとも一方の前記連結軸部は、前記第一、及び前記第二シャフトのうち、自身が連結される相手側シャフトに設けられた連結孔部に圧入され、
前記第一、及び前記第二シャフトの何れか一方のシャフトにステアリングホイールからの操舵力が付与される電動式パワーステアリング装置であって、
前記ばね軸部の外周面に座屈防止部材が外嵌支持又は結合固定されており、前記座屈防止部材の外周面が前記第一シャフトの内周面に近接若しくは接触している、電動式パワーステアリング装置。 - 前記座屈防止部材が、前記ばね軸部の外周面の軸方向中央部を含む部分に外嵌支持又は結合固定されている、請求項1に記載した電動式パワーステアリング装置。
- 前記座屈防止部材が、円周方向の1箇所にその中心軸に対して平行な又は傾斜した切れ目を有する円筒状部材である、請求項1又は2に記載した電動式パワーステアリング装置。
- 前記座屈防止部材が、円筒状の熱収縮チューブである、請求項1又は2に記載した電動式パワーステアリング装置。
- 前記座屈防止部材が、前記ばね軸部の外径側で射出成形された合成樹脂製部材である、請求項1又は2に記載した電動式パワーステアリング装置。
- 前記座屈防止部材が、前記ばね軸部の外周面に加硫接着されたゴム製部材である、請求項1又は2に記載した電動式パワーステアリング装置。
- 前記第一シャフトの軸方向一部分に設けられた第一ストッパ部と、前記第二シャフトの軸方向一部分に設けられた第二ストッパ部とが円周方向の隙間を介在させた状態で係合する事により、前記第一、及び第二シャフト同士の相対回転が所定角度範囲内に規制されており、
前記一方の連結軸部が前記第一シャフトに対してトルク伝達可能に且つ軸方向の相対変位を阻止された状態で連結されており、
前記他方の連結軸部が前記第二シャフトに設けられた連結孔部に対して圧入されており、
組立時に、前記トーションバーのばね軸部の外周面と前記第一シャフトの内周面との間に前記座屈防止部材を配置すると共に、前記一方の連結軸部を前記第一シャフトに対してトルク伝達可能に且つ軸方向の相対変位を阻止した状態で連結した後、前記他方の連結軸部を前記第二シャフトに設けられた連結孔部に対して圧入する前に、前記第一、及び第二ストッパ部の少なくとも一部分同士を円周方向の隙間を介在させた状態で係合させる事が可能な寸法関係を有している、
請求項1に記載した電動式パワーステアリング装置。 - 前記第一シャフトの軸方向一部分に設けられた第一ストッパ部と、前記第二シャフトの軸方向一部分に設けられた第二ストッパ部とが円周方向の隙間を介在させた状態で係合する事により、前記第一、及び第二シャフト同士の相対回転が所定角度範囲内に規制されており、
前記一方の連結軸部が前記第一シャフトに設けられた連結孔部に対して圧入されており、
前記他方の連結軸部が、前記第二シャフトに設けられた連結孔部に対して圧入されると共に、前記連結孔部の奥端部に突き当てられており、
組立時に、前記他方の連結軸部を前記第二シャフトに設けられた連結孔部に対して圧入すると共に前記連結孔部の奥端部に突き当てた状態で、前記トーションバーのばね軸部の外周面と前記第一シャフトの内周面との間に前記座屈防止部材を配置した後、前記一方の連結軸部を前記第一シャフトに設けられた連結孔部に対して圧入する前に、前記第一、及び第二ストッパ部の少なくとも一部分同士を円周方向の隙間を介在させた状態で係合させる事が可能な寸法関係を有している、
請求項1に記載した電動式パワーステアリング装置。 - 前記第一シャフトの軸方向一部分に設けられた第一ストッパ部と、前記第二シャフトの軸方向一部分に設けられた第二ストッパ部とが円周方向の隙間を介在させた状態で係合する事により、前記第一、及び第二シャフト同士の相対回転が所定角度範囲内に規制されており、
前記一方の連結軸部が前記第一シャフトに設けられた連結孔部に対して圧入されており、
前記他方の連結軸部が、前記第二シャフトに設けられた連結孔部に対して圧入されると共に、前記連結孔部の奥端部に突き当てられており、
組立時に、前記座屈防止部材が配置された前記トーションバーを前記第一シャフトの内径側に挿入し、前記他方の連結軸部を前記第二シャフトに設けられた連結孔部に対して圧入しつつ、前記連結孔部の奥端部に突き当てた状態にすると共に、前記一方の連結軸部を前記第一シャフトに設けられた連結孔部に対して圧入する、前記両方の連結軸部の圧入前に、前記第一、及び第二ストッパ部の少なくとも一部分同士を円周方向の隙間を介在させた状態で係合させる事を可能とする寸法関係を有している、
請求項1に記載した電動式パワーステアリング装置。 - 前記第一シャフトは中心孔を有し、該中心孔の前記第二シャフト側先端部に滑りブッシ
ュ挿入穴を設け、該挿入穴に滑りブッシュを挿入したことを特徴とする、
請求項1~9のうちの何れか1項に記載した電動式パワーステアリング装置。 - 請求項7に記載した電動式パワーステアリング装置の組立方法であって、
前記トーションバーのばね軸部の外周面と前記第一シャフトの内周面との間に前記座屈防止部材を配置すると共に、前記一方の連結軸部を前記第一シャフトに対してトルク伝達可能に且つ軸方向の相対変位を阻止した状態で連結した後、前記第一、及び第二ストッパ部の少なくとも一部分同士を円周方向の隙間を介在させた状態で係合させると共に、前記第一、及び第二シャフト同士の回転方向に関する互いの位置関係を前記所定角度範囲の中央位置に合わせた状態で、前記他方の連結軸部を前記第二シャフトに設けられた連結孔部に対して圧入する事を特徴とする、
電動式パワーステアリング装置の組立方法。 - 請求項8に記載した電動式パワーステアリング装置の組立方法であって、
前記トーションバーの他方の連結軸部を、前記第二シャフトに設けられた連結孔部に対して圧入すると共に前記連結孔部の奥端部に突き当てた状態で、前記トーションバーのばね軸部の外周面と前記第一シャフトの内周面との間に前記座屈防止部材を配置し、更に、前記第一、及び第二ストッパ部の少なくとも一部分同士を円周方向の隙間を介在させた状態で係合させると共に、前記第一、及び第二シャフト同士の回転方向に関する互いの位置関係を前記所定角度範囲の中央位置に合わせた状態で、前記一方の連結軸部を前記第一シャフトに設けられた連結孔部に対して圧入する事を特徴とする、
電動式パワーステアリング装置の組立方法。 - 請求項9に記載した電動式パワーステアリング装置の組立方法であって、
前記第一、及び第二ストッパ部の少なくとも一部分同士を円周方向の隙間を介在させた状態で係合させると共に、前記第一、及び第二シャフト同士の回転方向に関する互いの位置関係を前記所定角度範囲の中央位置に合わせた状態で、前記座屈防止部材が配置された前記トーションバーを前記第一シャフトの内径側に挿入し、前記他方の連結軸部を、前記第二シャフトに設けられた連結孔部に対して圧入しつつ、前記連結孔部の奥端部に突き当てた状態にすると共に、前記一方の連結軸部を前記第一シャフトに設けられた連結孔部に対して圧入する事を特徴とする、
電動式パワーステアリング装置の組立方法。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP15757733.9A EP3081459B1 (en) | 2014-03-05 | 2015-01-09 | Electric power steering device and method for assembling same |
CN201580003025.XA CN105829190B (zh) | 2014-03-05 | 2015-01-09 | 电动式助力转向装置及其组装方法 |
US15/102,920 US10000227B2 (en) | 2014-03-05 | 2015-01-09 | Electric power steering device and method for assembling the same |
JP2016506159A JP6555250B2 (ja) | 2014-03-05 | 2015-01-09 | 電動式パワーステアリング装置及びその組立方法 |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2014-043293 | 2014-03-05 | ||
JP2014043293 | 2014-03-05 | ||
JP2014-160032 | 2014-08-06 | ||
JP2014160032 | 2014-08-06 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2015133168A1 true WO2015133168A1 (ja) | 2015-09-11 |
Family
ID=54054980
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2015/050530 WO2015133168A1 (ja) | 2014-03-05 | 2015-01-09 | 電動式パワーステアリング装置及びその組立方法 |
Country Status (5)
Country | Link |
---|---|
US (1) | US10000227B2 (ja) |
EP (1) | EP3081459B1 (ja) |
JP (1) | JP6555250B2 (ja) |
CN (1) | CN105829190B (ja) |
WO (1) | WO2015133168A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2016087089A1 (de) * | 2014-12-03 | 2016-06-09 | Trw Automotive Gmbh | Servolenkung für fahrzeuge |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101869160B1 (ko) * | 2016-10-10 | 2018-06-19 | 주식회사 만도 | 전동식 조향장치의 2중 토션바 |
DE102016220140A1 (de) * | 2016-10-14 | 2018-04-19 | Thyssenkrupp Ag | Lenksäule für ein Kraftfahrzeug und Verfahren zum Herstellen einer Lenksäule |
US20180118259A1 (en) | 2016-10-31 | 2018-05-03 | Steering Solutions Ip Holding Corporation | Torsion bar for a steering system assembly |
DE102017222999B4 (de) * | 2017-12-18 | 2021-10-21 | Robert Bosch Gmbh | Sensoreinrichtung für ein Lenksystem eines Fahrzeugs |
US10906578B2 (en) * | 2017-12-29 | 2021-02-02 | Steering Solutions Ip Holding Corporation | Power actuator assembly for steering column assemblies |
CN111683859B (zh) * | 2018-01-15 | 2022-07-29 | 日本精工株式会社 | 电动式动力转向装置用齿轮外壳 |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2003207029A (ja) * | 2002-01-11 | 2003-07-25 | Koyo Seiko Co Ltd | 減速歯車機構及び電動式パワーステアリング装置 |
WO2006048392A1 (de) * | 2004-11-03 | 2006-05-11 | Zf Lenksysteme Gmbh | Vorrichtung zur übertragung von drehmomenten |
JP2007302066A (ja) * | 2006-05-09 | 2007-11-22 | Nsk Ltd | 電動パワーステアリング装置 |
JP2010036678A (ja) * | 2008-08-04 | 2010-02-18 | Nsk Ltd | 電動式パワーステアリング装置 |
JP2010122096A (ja) * | 2008-11-20 | 2010-06-03 | Nsk Ltd | トルク検出器 |
US20100147619A1 (en) * | 2008-12-12 | 2010-06-17 | Delphi Technologies Inc. | Methods and systems involving electromagnetic torsion bars |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3309817B2 (ja) * | 1998-10-29 | 2002-07-29 | 日本精工株式会社 | トルクセンサの製造方法 |
GB2402916B (en) | 2002-06-06 | 2006-02-15 | Nsk Ltd | Electric power steering apparatus |
JP2005091204A (ja) * | 2003-09-18 | 2005-04-07 | Toyoda Mach Works Ltd | 電気式動力舵取装置 |
US20070235246A1 (en) * | 2004-06-17 | 2007-10-11 | Yuji Kawaike | Vehicle Steering System And Assembling Method Thereof |
DE102005053181A1 (de) * | 2005-11-03 | 2007-05-10 | Valeo Schalter Und Sensoren Gmbh | Vorrichtung für ein Lenksystem eines Kraftfahrzeugs |
JP2007333678A (ja) * | 2006-06-19 | 2007-12-27 | Nsk Ltd | トルクセンサ |
JP5104707B2 (ja) | 2008-10-10 | 2012-12-19 | 日本精工株式会社 | ステアリング装置及びその製造方法 |
DE102011054983B4 (de) * | 2011-11-02 | 2024-02-01 | Robert Bosch Gmbh | Sensorbaugruppe für eine elektrische hilfskraftlenkung |
CN203450195U (zh) * | 2013-09-27 | 2014-02-26 | 安徽江淮汽车股份有限公司 | 电动转向管柱 |
EP2988106A4 (en) * | 2014-01-09 | 2016-11-16 | Nsk Ltd | TORQUE SENSOR AND ELECTRIC POWER STEERING DEVICE |
DE102014102807B3 (de) * | 2014-03-04 | 2015-04-02 | Thyssenkrupp Presta Ag | Lenkwelle für eine Kraftfahrzeuglenkung |
JP6555249B2 (ja) * | 2014-03-05 | 2019-08-07 | 日本精工株式会社 | 電動式パワーステアリング装置及びその組立方法 |
-
2015
- 2015-01-09 US US15/102,920 patent/US10000227B2/en active Active
- 2015-01-09 JP JP2016506159A patent/JP6555250B2/ja active Active
- 2015-01-09 EP EP15757733.9A patent/EP3081459B1/en active Active
- 2015-01-09 WO PCT/JP2015/050530 patent/WO2015133168A1/ja active Application Filing
- 2015-01-09 CN CN201580003025.XA patent/CN105829190B/zh active Active
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2003207029A (ja) * | 2002-01-11 | 2003-07-25 | Koyo Seiko Co Ltd | 減速歯車機構及び電動式パワーステアリング装置 |
WO2006048392A1 (de) * | 2004-11-03 | 2006-05-11 | Zf Lenksysteme Gmbh | Vorrichtung zur übertragung von drehmomenten |
JP2007302066A (ja) * | 2006-05-09 | 2007-11-22 | Nsk Ltd | 電動パワーステアリング装置 |
JP2010036678A (ja) * | 2008-08-04 | 2010-02-18 | Nsk Ltd | 電動式パワーステアリング装置 |
JP2010122096A (ja) * | 2008-11-20 | 2010-06-03 | Nsk Ltd | トルク検出器 |
US20100147619A1 (en) * | 2008-12-12 | 2010-06-17 | Delphi Technologies Inc. | Methods and systems involving electromagnetic torsion bars |
Non-Patent Citations (1)
Title |
---|
See also references of EP3081459A4 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2016087089A1 (de) * | 2014-12-03 | 2016-06-09 | Trw Automotive Gmbh | Servolenkung für fahrzeuge |
US10494020B2 (en) | 2014-12-03 | 2019-12-03 | Trw Automotive Gmbh | Power steering for a vehicle |
Also Published As
Publication number | Publication date |
---|---|
EP3081459B1 (en) | 2019-02-27 |
CN105829190B (zh) | 2018-03-16 |
EP3081459A1 (en) | 2016-10-19 |
CN105829190A (zh) | 2016-08-03 |
JP6555250B2 (ja) | 2019-08-07 |
EP3081459A4 (en) | 2017-01-25 |
JPWO2015133168A1 (ja) | 2017-04-06 |
US10000227B2 (en) | 2018-06-19 |
US20160304111A1 (en) | 2016-10-20 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP6555250B2 (ja) | 電動式パワーステアリング装置及びその組立方法 | |
US10005490B2 (en) | Electric power steering apparatus | |
JP6304368B2 (ja) | トルク伝達ユニット | |
KR20160133968A (ko) | 전동식 동력 보조 조향장치의 감속기 | |
KR102582282B1 (ko) | 조향장치의 동력 전달부재 | |
WO2014199959A1 (ja) | 電動式パワーステアリング装置 | |
CN110871835B (zh) | 转向***的动力传动装置 | |
CN108349527B (zh) | 电动式助力转向装置及其组装方法 | |
JP6555249B2 (ja) | 電動式パワーステアリング装置及びその組立方法 | |
JP6471552B2 (ja) | 止め輪及びウォーム減速機 | |
EP3214340A1 (en) | Worm reducer and electrically driven assist device | |
JP6364823B2 (ja) | 電動式パワーステアリング装置及びその製造方法 | |
KR101993295B1 (ko) | 전동식 동력 보조 조향장치의 감속기 | |
KR101818275B1 (ko) | 전동식 동력 보조 조향장치의 감속기 | |
JP5321655B2 (ja) | ステアリング装置用トルク伝達装置 | |
CN113586617B (zh) | 注塑刚性花键轴连接 | |
JP2015168306A5 (ja) | ||
JP2015101237A (ja) | 電動式パワーステアリング装置 | |
CN111065835A (zh) | 扭矩传递轴 | |
JP2008261423A (ja) | 伸縮式回転伝達軸 | |
JP2020085110A (ja) | トルク伝達軸 | |
KR101450321B1 (ko) | 전동식 동력 보조 조향장치의 감속기 | |
CN114616163A (zh) | 带孔盖的外管 | |
JP2021127778A (ja) | 伸縮軸の製造方法 | |
JP2017075649A (ja) | ダストカバー付中間シャフト |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 15757733 Country of ref document: EP Kind code of ref document: A1 |
|
REEP | Request for entry into the european phase |
Ref document number: 2015757733 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2015757733 Country of ref document: EP |
|
ENP | Entry into the national phase |
Ref document number: 2016506159 Country of ref document: JP Kind code of ref document: A |
|
WWE | Wipo information: entry into national phase |
Ref document number: 15102920 Country of ref document: US |
|
NENP | Non-entry into the national phase |
Ref country code: DE |