WO2015133167A1 - 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
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- WO2015133167A1 WO2015133167A1 PCT/JP2015/050529 JP2015050529W WO2015133167A1 WO 2015133167 A1 WO2015133167 A1 WO 2015133167A1 JP 2015050529 W JP2015050529 W JP 2015050529W WO 2015133167 A1 WO2015133167 A1 WO 2015133167A1
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- WIPO (PCT)
- Prior art keywords
- shaft
- electric power
- power steering
- peripheral surface
- axial direction
- 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
- 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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- 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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D3/00—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
- F16D3/02—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive adapted to specific functions
- F16D3/12—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive adapted to specific functions specially adapted for accumulation of energy to absorb shocks or vibration
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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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- 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
- F16H—GEARING
- F16H1/00—Toothed gearings for conveying rotary motion
- F16H1/02—Toothed gearings for conveying rotary motion without gears having orbital motion
- F16H1/04—Toothed gearings for conveying rotary motion without gears having orbital motion involving only two intermeshing members
- F16H1/12—Toothed gearings for conveying rotary motion without gears having orbital motion involving only two intermeshing members with non-parallel axes
- F16H1/16—Toothed gearings for conveying rotary motion without gears having orbital motion involving only two intermeshing members with non-parallel axes comprising worm and worm-wheel
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. 21 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. 21 is an electric power steering device 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 has an input shaft 12 to which a steering force is applied from the steering wheel 4 (FIG. 21) and auxiliary power using the electric motor 10 (FIG. 21) as a generation source.
- a hollow output shaft 13, a torsion bar 14 that is disposed on the inner diameter side of the output shaft 13, and whose both ends are connected to the output shaft 13 and the input shaft 12 so as to transmit torque, and torsion A torque detector that detects a steering force based on elastic torsional deformation of the bar 14 is included (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. They are connected in a state in which relative rotation is restricted within a predetermined angle range.
- the rear end portion (the right end portion in FIG. 22) 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. 22) 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. Then, 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 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.
- the spring shaft portion is provided on either the outer peripheral surface in the axial intermediate portion of the spring shaft portion or the inner peripheral surface in the axial intermediate portion of the first shaft.
- the radially extending portion is configured so that the radially extending portion is opposite to the other opposing surface of the outer peripheral surface in the axial intermediate portion of the spring shaft portion and the inner peripheral surface in the axial intermediate portion of the first shaft. It is closer to or in contact with the adjacent parts on both sides in the axial direction.
- 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.
- the radially extending portion is constituted by an axially intermediate portion of the spring shaft portion, and has an outer diameter as compared with adjacent portions on both axial sides. Whether the outer diameter of the large diameter portion is closer to the inner peripheral surface of the first shaft than the outer peripheral surface of the portion adjacent to both axial sides of the large diameter portion. Or contact.
- the radially extending portion is a small-diameter portion that is configured by an axially intermediate portion of the first shaft and has a smaller outer diameter than portions adjacent to both sides in the axial direction. The peripheral surface is closer to or in contact with the outer peripheral surface of the spring shaft portion than the inner peripheral surface of the portion adjacent to both axial sides of the small diameter portion.
- the radially extending portion is a bush provided in an axially intermediate portion of the spring shaft portion, and an outer peripheral surface of the bush is axially opposite to the inner peripheral surface of the first shaft. Is closer to or in contact with the outer peripheral surface of the portion adjacent to.
- the radially extending portion is a bush provided in an axially intermediate portion of the inner diameter portion of the first shaft, and the inner peripheral surface of the bush is in relation to the outer peripheral surface of the spring shaft portion. It is closer to or in contact with the inner peripheral surface of the portion adjacent to both sides in the axial direction.
- the large-diameter portion or the small-diameter portion is provided in a portion including the central portion in the axial direction of the spring shaft portion.
- the said large diameter part or the said small diameter part can also be provided only in the one axial direction of the said spring axial part, or may provide in the axial direction several places of the said spring axial part. You can also.
- 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 torsion bar is disposed on the inner diameter side of the first shaft, and the one connecting shaft portion is capable of transmitting torque to the first shaft and preventing relative displacement in the axial direction.
- a gap in the circumferential direction is formed between at least a part of the first and second stopper portions. Provide a dimensional relationship that enables engagement in an intervened state.
- 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.
- connection shaft portion is press-fitted into the connection hole portion provided in the second shaft and the torsion bar is moved to the back end portion of the connection hole portion.
- the first and second stopper portions are placed together. It has a dimensional relationship that enables engagement with a circumferential gap interposed.
- 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 other connecting shaft portion is press-fitted into the connecting hole portion provided in the second shaft,
- the first and second connecting shafts are press-fitted into the connecting hole provided in the first shaft, and the first, And at least a portion of the second stopper portion has a dimensional relationship that enables engagement with a gap in the circumferential direction interposed therebetween.
- the first shaft has a center hole, and a sliding bush insertion hole is provided at a tip of the center hole on the second shaft side. Insert the sliding bush into the sliding bush insertion hole.
- the other connecting shaft portion connected to the connecting hole portion provided in the second shaft is formed long in the axial direction so as to come into contact with the sliding bush.
- an electric power steering device assembly method is the above-described electric power steering device assembly method, wherein the torsion bar is disposed on the inner diameter side of the first shaft, and The connecting shaft portion is connected to the first shaft in a state capable of transmitting torque and preventing relative displacement in the axial direction. Thereafter, 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 is connected to the second shaft.
- the torsion bar is inserted into the inner diameter side of the first shaft while being pressed against the inner end of the connecting hole. Further, 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 torsion bar is engaged with the first shaft in a state in which the mutual positional relationship with respect to the rotation direction of the first and second shafts is aligned with the center position of the predetermined angle range.
- 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 and deformed. 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.
- FIG. 1 The partial cutting side view which shows 1st Embodiment of this invention.
- Sectional drawing which shows the stage following FIG. 3 of an assembly.
- Sectional drawing which shows the state after completion of an assembly.
- Sectional drawing which takes out only some components, such as an input shaft, an output shaft, a torsion bar, etc. among the structures of 2nd Embodiment of this invention, and shows the intermediate
- the fragmentary sectional view which shows the modification of the shape of the large diameter part provided in the spring axial part of a torsion bar.
- the principal part sectional drawing which shows the 1st example of the structure which can aim at the ease of the operation
- the principal part sectional drawing which shows the 2nd example of the structure which can aim at the ease of the operation
- FIG. 8 which shows 4th Embodiment of this invention.
- FIG. 8 which shows 5th Embodiment of this invention.
- FIG. 8 which shows 6th Embodiment of this invention.
- Sectional drawing which takes out only some components, such as an input shaft and an output shaft, from the structure of 7th Embodiment of this invention, and shows the middle stage of the assembly of each of these components.
- FIG. 19 is a cross-sectional view showing a stage subsequent to FIG. 18 of assembly. Sectional drawing which shows the state after completion of an assembly.
- the partially cut side view which shows an example of the electric power steering apparatus conventionally known.
- Sectional drawing which takes out only some components, such as an input shaft, an output shaft, and a torsion bar, from the housing of the electric power steering apparatus known conventionally.
- the electric power steering apparatus of the present embodiment includes a steering column 2a, a steering shaft 3a, a housing 11a, an output shaft 13a, a torsion bar 14a, a torque detection sleeve 22, a torque detection coil unit 23, An electric motor 10 (see FIG. 21) 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 1 (see FIG. 21) 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. 21) 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 are a pair of connecting shaft portions 35a and 35b, and an axial intermediate portion that is a portion between the connecting shaft portions 35a and 35b is a spring shaft portion. 36.
- a large-diameter portion 37 serving as a radially extending portion having a larger outer diameter than the portions adjacent to both sides in the axial direction is provided at the central portion in the axial direction of the spring shaft portion 36.
- the outer diameter dimension of such a spring shaft portion 36 is smaller than the outer diameter size of the connecting shaft portions 35a and 35b at least at a portion other than the large diameter portion 37.
- Such a torsion bar 14a is arranged on the inner diameter side of the output shaft 13a, and the cylindrical outer peripheral surface of the large-diameter portion 37 is brought close to the cylindrical inner peripheral surface of the output shaft 13a. (It is closer to the outer peripheral surface of the portion adjacent to both sides in the axial direction of the large-diameter portion 37), or the contact is made without giving a tightening margin.
- the front connecting shaft portion 35a is connected to the output shaft 13a which is the first shaft
- the rear connecting shaft portion 35b is connected to the lower shaft 28 which is the second shaft and the input shaft so as to transmit torque. ing.
- 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 connected to the front end portion of the center hole 18a of the output shaft 13a. It is internally fitted in the provided connecting hole 19a. In this state, 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. Further, 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 inner serration provided on the outer peripheral surface of the rear connecting shaft portion 35b and subjected to hardening treatment such as quenching is not subjected to hardening treatment, and the cylindrical inner circumference of the connecting hole portion 17a.
- the surface is mechanically cut.
- a cylindrical tube portion 38 is provided at the front end portion of the lower shaft 28.
- a female stopper portion 15a having a concave and convex shape (gear shape) 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
- a concave / convex portion 39 for torque detection having a concave / convex shape (gear shape) in the circumferential direction is provided.
- Such a torque detecting concavo-convex 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. At the same time, 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 11a, 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. 21) 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 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 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. 3, 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.
- a circumferential clearance is interposed between the rear end portion of the male stopper portion 16a and the front end portion of the female stopper portion 15a.
- the dimension A1 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 (the protruding amount of the connecting shaft portion 35b from the rear end opening of the center hole 18a of the output shaft 13a). ) Slightly larger than B1 (A1> B1).
- the engagement state between the male and female stopper portions 16a and 15a is set to the neutral state in the circumferential direction, whereby each other in the rotational direction of the lower shaft 28 and the output shaft 13a. 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 as to transmit torque.
- 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 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.
- the outer peripheral surface of the large diameter portion 37 provided at the axial center portion of the spring shaft portion 36 is the inner peripheral surface of the output shaft 13a.
- the buckling deformation is prevented by being in contact with or contacting.
- the buckling deformation of the spring shaft portion 36 is a deformation in such a manner that the spring shaft portion 36 bends in a bow shape.
- it is large in the axial center portion of the spring shaft portion 36 (the portion where the amount of displacement in the radial direction becomes maximum when the spring shaft portion 36 undergoes buckling deformation).
- a diameter portion 37 is provided. For this reason, the buckling deformation of the spring shaft portion 36 can be efficiently prevented based on the contact between the outer peripheral surface of the large diameter portion 37 and the inner peripheral surface of the output shaft 13a.
- FIG. 8 A second embodiment of the present invention will be described with reference to FIGS. 6 to 8, 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 large-diameter portion 37 provided at the axial center portion of the spring shaft portion 36 is the inner periphery of the output shaft 13b.
- the buckling deformation is prevented by contacting or contacting the surface.
- the axial ends of the male and female stopper portions 16a and 15a are connected to each other prior to press-fitting the connecting shaft portion 35c into the connecting hole portion 19b. Since they can be engaged, it is easy to match the positional relationship of the lower shaft 28 and the output shaft 13b with respect to the rotational 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. 9 shows a third embodiment of the present invention.
- the number and the axial position of the large-diameter portions provided in the axially intermediate portion of the spring shaft portion 36a constituting the torsion bar 14c are different from those in the second embodiment described above. That is, in the case of this embodiment, a pair of large-diameter portions 37, 37 are provided at both ends of the intermediate portion in the axial direction of the spring shaft portion 36a.
- the cylindrical outer peripheral surfaces of the large diameter portions 37 and 37 are brought into contact with the cylindrical inner peripheral surface of the output shaft 13b without having proximity or interference.
- the structure which provides a large diameter part in the axial direction several places of a spring shaft part is the 1st and 2nd embodiment mentioned above and 4th and 7th embodiment mentioned later. It can also be applied to other structures.
- the outer peripheral surface of the large-diameter portion provided in the spring shaft portion is a cylindrical surface.
- the outer peripheral surface of the large-diameter portion has a cylindrical shape. It can also be made into shapes other than a surface. For example, as shown in FIG.
- the shape of the outer peripheral surface of the large-diameter portion 37a provided on the spring shaft portion 36b can be a shape like the outer peripheral surface of the beer barrel.
- low friction materials such as a synthetic resin, can also be coated on the outer peripheral surface of the large diameter part provided in a spring axial part.
- a guide shaft portion 43 that is concentric with the connection shaft portion 35 d and has a smaller diameter than the connection shaft portion 35 d is disposed at a portion adjacent to the distal end side (left side in FIG. 11) of the connection shaft portion 35 d.
- 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 outer peripheral surface of the guide shaft portion 43 can also be tapered (tapered) with a smaller diameter dimension toward the left side in FIG. 11.
- a guide hole that is concentric with the connecting hole portion 19c and larger in diameter than the connecting hole portion 19c is adjacent to the inlet side (right side in FIG. 12) of the connecting hole portion 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 of the inner peripheral surface of the guide hole portion 44a provided in the portion adjacent to the inlet side (right side in FIG. 13) of the connecting hole portion 19c increases toward the left side in FIG.
- the example shown in FIG. 14 is an example provided with both the guide shaft portion 43 described in FIG. 11 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.
- the male and female stopper portions 16a as described above are engaged with the other portions. , 15a can be easily engaged in a neutral state in the circumferential direction.
- FIG. 15 shows a fourth 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 tip of the output shaft 13b on the lower shaft 28 side, and the sliding bush 52 supports the connecting shaft portion 35b of the torsion bar 14b, whereby the female stopper portion 15a of the lower shaft 28 is supported.
- the sliding bush 52 supports the connecting shaft portion 35b of the torsion bar 14b, whereby the female stopper portion 15a of the lower shaft 28 is supported.
- the connecting shaft portion 35 b that is connected to the connecting hole portion 17 a of the lower shaft 28 and has a diameter larger than that of the spring shaft portion 36 is connected to the sliding bush 52. Long in the direction.
- Other configurations and operations are the same as in the case of the second embodiment described above, so overlapping illustrations and descriptions are omitted.
- FIG. 16 shows a fifth embodiment of the present invention.
- the portion including the central portion in the axial direction of the center hole 18b of the output shaft 13b has a small diameter as a radially extending portion.
- the point which provided the part 55 and made the state which the inner surface of the small diameter part 55 contacted or contacted the outer peripheral surface of the spring shaft part 36 differs from the case of 2nd Embodiment mentioned above.
- the torsion bar 14b is arranged on the inner diameter side of the output shaft 13b, and the cylindrical inner peripheral surface of the small diameter portion 55 is brought close to the cylindrical outer peripheral surface of the spring shaft portion 36 ( The smaller diameter portion 55 is closer to the inner peripheral surface of the portion adjacent to both sides in the axial direction), or the small diameter portion 55 is brought into contact with no tightening allowance.
- the configuration in which the small diameter portion 55 is provided in the central hole 18b of the output shaft 13b is the same as in the second embodiment in that the spring shaft portion 36 of the torsion bar 14b can be prevented from buckling.
- the connecting shaft portion 35c is press-fitted into the connecting hole portion 19b, a large axial compression force is applied to the spring shaft portion 36.
- FIG. 17 shows a sixth embodiment of the present invention.
- a bush 56 is provided as a radially extending portion, or the axial direction of the center hole 18b of the output shaft 13b.
- the point which provides the bush 56 as a radial direction extension part instead of providing the small diameter part 55 in a center part differs from the case of the said 2nd or 5th Embodiment.
- the bush 56 is press-fitted from the connecting shaft portion 35c side of the torsion bar 14b.
- the bush 56 is made of metal or resin, and the inner diameter is slightly smaller than the outer diameter of the spring shaft portion 36. In this case, the press-in operation can be facilitated by providing the bush 56 with a slit over the entire length in the axial direction.
- the bush 56 is provided in the axial center of the center hole 18b of the output shaft 13b and the bush 56 is to function as a small diameter portion, the bush 56 is provided from the side where the connecting hole 19b of the center hole 18b of the output shaft 13b is not provided. By press-fitting, it is fixed to the central portion in the axial direction of the center hole 18b.
- the outer peripheral surface of the bush 56 is in contact with or in contact with the inner peripheral surface of the center hole 18b of the output shaft 13b, and the inner peripheral surface of the bush 56 is in contact with the outer peripheral surface of the spring shaft portion 36 or
- the point of contact is the same as in the case of the large-diameter portion 37 of the second embodiment and the small-diameter portion 55 of the fifth embodiment described above.
- the bush 56 is provided at the axial center of the spring shaft 36 or the bush 56 is provided at the axial center of the center hole 18b of the output shaft 13b to prevent the spring shaft 36 of the torsion bar 14b from buckling.
- the possible points are the same as in the second or fifth embodiment.
- Other configurations and operations are the same as those of the second or fifth embodiment described above, and thus overlapping illustrations and descriptions are omitted.
- an example in which only one bush 56 is provided is shown, but two or three or more bushes may be provided.
- FIGS. 18 to 20 A seventh embodiment of the present invention will be described with reference to FIGS. 18 to 20, 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 that in the second embodiment described above. That is, in the case of the present embodiment, first, as shown in FIG. 18, the base end portion of the torque detection sleeve 22 is fitted and 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. Set to the center position of.
- the distance from the rear end portion of the output shaft 13b to the opening portion of the connecting hole portion 17a is determined 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.
- the torsion bar 14b is moved from the front end side of the output shaft 13b to the torsion bar 14b.
- the shaft is inserted into the center hole 18b, and the connecting shaft portion 35b of the torsion bar 14b is engaged with the opening 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.
- 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 from the steering wheel is applied, 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.
- a cylindrical bushing made of a low friction material such as a synthetic resin is fitted and fixed to an end of the inner surface of the first shaft on the second shaft side in the axial direction.
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、
前記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、前記ばね軸部の軸方向中間部における外周面と前記第一シャフトの軸方向中間部における内周面の何れか一方には、前記ばね軸部、前記第一シャフト、又は前記ばね軸部若しくは前記第一シャフトに設けられたブッシュの何れかによって構成され、軸方向両側に隣接する部分に比べて径方向に延出する径方向延出部が設けられ、
該径方向延出部は、前記ばね軸部の軸方向中間部における外周面と前記第一シャフトの軸方向中間部における内周面の何れか他方の対向面に対し、前記径方向延出部の軸方向両側に隣接する部分よりも近づいている、又は、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。
又は、前記径方向延出部は、前記第一シャフトの軸方向中間部によって構成され、軸方向両側に隣接する部分に比べて外径寸法が小さくなった小径部であり、該小径部の内周面が前記ばね軸部の外周面に対し、前記小径部の軸方向両側に隣接する部分の内周面よりも近づいているか、又は、接触している。
或いは、前記径方向延出部は、前記第一シャフトの内径部の軸方向中間部に設けられたブッシュであり、該ブッシュの内周面が前記ばね軸部の外周面に対し、前記ブッシュの軸方向両側に隣接する部分の内周面よりも近づいているか、又は、接触している。
さらに、本発明を実施する場合、前記大径部又は前記小径部は、前記ばね軸部の軸方向1箇所にのみ設ける事もできるし、或いは、前記ばね軸部の軸方向複数箇所に設ける事もできる。
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を前記第一シャフトの内径側に配置すると共に、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を可能とする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を前記第一シャフトの内径側に挿入した後、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を可能とする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。
組立時に、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持たせる。
より好ましくは、前記第二シャフトに設けられた前記連結孔部と連結する前記他方の連結軸部は、前記滑りブッシュと接触するように軸方向に長く形成される。
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、ばね軸部の軸方向中間部の外周面と第一シャフトの軸方向中間部の内周面の何れか一方に設けられた径方向延出部が何れか他方の対向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を図り易い。
本発明の第1実施形態に就いて、図1~5を参照しつつ説明する。尚、図1~5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、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21参照)と、ウォーム式減速機24とを備える。
尚、本実施形態の構造を実施する場合、図3~5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6~8を参照しつつ説明する。尚、図6~8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8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9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14cを構成するばね軸部36aの軸方向中間部に設ける大径部の個数及び軸方向位置が、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、ばね軸部36aの軸方向中間部の両端寄り部分に、1対の大径部37、37を設けている。そして、大径部37、37の円筒状の外周面を、出力軸13bの円筒状の内周面に対し、近接又は締め代を持たせる事なく接触させている。この様に、本実施形態の場合には、ばね軸部36aの軸方向中間部の両端寄り部分に1対の大径部37、37を設けている為、大径部37、37の外周面と出力軸13bの内周面との接触に基づいて、組立作業を行う際のばね軸部36aの座屈変形を効率良く防止できる。
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、上述した第1~第3実施形態では、ばね軸部に設ける大径部の外周面を円筒面としたが、本発明を実施する場合、この大径部の外周面の形状は、円筒面以外の形状とする事もできる。例えば図10に示す様に、ばね軸部36bに設ける大径部37aの外周面の形状を、ビヤ樽の外周面の如き形状とする事もできる。
又、本発明を実施する場合には、ばね軸部に設ける大径部の外周面に合成樹脂等の低摩擦材をコーティングする事もできる。この様な構成を採用すれば、大径部の外周面が第一シャフトの内周面と接触した場合でも、ばね軸部のばね定数が変化しにくくなる。
尚、図11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11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14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14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15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、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を挿入し、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恐れ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恐れがなくなる。
なお、本実施形態に使用されるトーションバー14bでは、ロアシャフト28の連結孔部17aと連結する、ばね軸部36よりも大径の連結軸部35bが、滑りブッシュ52と接触するように軸方向に長く形成される。
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。
図16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、ばね軸部36の軸方向中央部に大径部37を設ける代わりに、出力軸13bの中心孔18bの軸方向中央部を含む部分に径方向延出部として小径部55を設け、小径部55の内面がばね軸部36の外周面に接触している又は接触する状態にした点が、上述した第2実施形態の場合と異なる。
即ち、トーションバー14bは、出力軸13bの内径側に配置された状態で、小径部55の円筒状の内周面を、ばね軸部36の円筒状の外周面に対し、近接させている(この小径部55の軸方向両側に隣接する部分の内周面よりも近づけている)か、又は、締め代を持たせる事なく接触させている。
出力軸13bの中心孔18bに小径部55を設ける構成によって、トーションバー14bのばね軸部36が座屈する事を防止できる点は第2実施形態の場合と同様である。
本実施形態の場合、連結軸部35cを連結孔部19bに対して圧入する際には、ばね軸部36に大きな軸方向圧縮力が加わる。但し、この大きな軸方向圧縮力によって、ばね軸部36が座屈変形しようとしても、出力軸13bの中心孔18bに設けられた小径部55の内面がばね軸部36外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。
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。
図17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、ばね軸部36の軸方向中央部に大径部37を設ける代わりに、径方向延出部としてブッシュ56を設ける、又は、出力軸13bの中心孔18bの軸方向中央部に小径部55を設ける代わりに、径方向延出部としてブッシュ56を設ける点が上記第2又は第5実施形態の場合と異なる。
ばね軸部36の軸方向中央部にブッシュ56を設け、ブッシュ56を大径部として機能させる場合にはブッシュ56をトーションバー14bの連結軸部35cの側から圧入することによって、ばね軸部36の軸方向中央部に固定する。
ブッシュ56は金属製又は樹脂製であって、内径寸法はばね軸部36の外径寸法よりも僅かに小さい寸法となっている。この場合、ブッシュ56に軸方向全長に亘ってスリットを設けることによって、圧入作業をし易くすることができる。
出力軸13bの中心孔18bの軸方向中央部にブッシュ56を設け、ブッシュ56を小径部として機能させる場合にはブッシュ56を出力軸13bの中心孔18bの連結孔部19bが設けてない側から圧入することによって、中心孔18bの軸方向中央部に固定する。
ブッシュ56の外周面が出力軸13bの中心孔18bの内周面に接触している又は接触する状態にした点、及びブッシュ56の内周面がばね軸部36外周面に接触している又は接触する状態にした点は、上述した第2実施形態の大径部37及び第5実施形態の場合の小径部55の場合と同じである。
ばね軸部36の軸方向中央部にブッシュ56を設ける、又は出力軸13bの中心孔18bの軸方向中央部にブッシュ56を設ける構成によって、トーションバー14bのばね軸部36が座屈する事を防止できる点は第2又は第5実施形態の場合と同様である。
その他の構成及び作用は、上述した第2又は第5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。
なお、本実施の形態においてはブッシュ56を1個のみを設けた例を示したが、2個又は3個以上であっても良い。
本発明の第7実施形態に就いて、図18~20を参照しつつ説明する。尚、図18~20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18~20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18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20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19→図20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、本発明は、第一、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。
又、本発明を実施する場合には、第一シャフトの内周面のうち軸方向に関して第二シャフト側の端部に、合成樹脂等の低摩擦材製で筒状のブッシュを内嵌固定すると共に、このブッシュの内周面によりトーションバーのばね軸部の外周面を摺動可能に支持する構成を採用する事もできる。この様な構成を採用すれば、第一シャフトとトーションバーとの傾斜防止を図り易くできる。
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、14c 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、36a、36b ばね軸部
37、37a 大径部(径方向延出部)
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
55 小径部(径方向延出部)
56 ブッシュ(径方向延出部)
Claims (17)
- 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、
前記ばね軸部の軸方向中間部における外周面と前記第一シャフトの軸方向中間部における内周面の何れか一方には、前記ばね軸部、前記第一シャフト、又は前記ばね軸部若しくは前記第一シャフトに設けられたブッシュの何れかによって構成され、軸方向両側に隣接する部分に比べて径方向に延出する径方向延出部が設けられ、
該径方向延出部は、前記ばね軸部の軸方向中間部における外周面と前記第一シャフトの軸方向中間部における内周面の何れか他方の対向面に対し、前記径方向延出部の軸方向両側に隣接する部分よりも近づいている、又は、接触している電動式パワーステアリング装置。 - 前記径方向延出部は、前記ばね軸部の軸方向中間部によって構成され、軸方向両側に隣接する部分に比べて外径寸法が大きくなった大径部であり、該大径部の外周面が前記第一シャフトの内周面に対し、前記大径部の軸方向両側に隣接する部分の外周面よりも近づいているか、又は、接触している、請求項1に記載した電動式パワーステアリング装置。
- 前記大径部が、前記ばね軸部の軸方向中央部を含む部分に設けられている、請求項2に記載した電動式パワーステアリング装置。
- 前記大径部が、前記ばね軸部の軸方向複数箇所に設けられている、請求項2に記載した電動式パワーステアリング装置。
- 前記径方向延出部は、前記第一シャフトの軸方向中間部によって構成され、軸方向両側に隣接する部分に比べて外径寸法が小さくなった小径部であり、該小径部の内周面が前記ばね軸部の外周面に対し、前記小径部の軸方向両側に隣接する部分の内周面よりも近づいているか、又は、接触している、請求項1に記載した電動式パワーステアリング装置。
- 前記小径部が、前記第一シャフトの軸方向中央部を含む部分に設けられている、請求項5に記載した電動式パワーステアリング装置。
- 前記小径部が、前記第一シャフトの軸方向複数箇所に設けられている、請求項5に記載した電動式パワーステアリング装置。
- 前記径方向延出部は、前記ばね軸部の軸方向中間部に設けられたブッシュであり、該ブッシュの外周面が前記第一シャフトの内周面に対し、前記ブッシュの軸方向両側に隣接する部分の外周面よりも近づいているか、又は、接触している、請求項1に記載した電動式パワーステアリング装置。
- 前記径方向延出部は、前記第一シャフトの内径部の軸方向中間部に設けられたブッシュであり、該ブッシュの内周面が前記ばね軸部の外周面に対し、前記ブッシュの軸方向両側に隣接する部分の内周面よりも近づいているか、又は、接触している、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を前記第一シャフトの内径側に配置すると共に、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、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を前記第一シャフトの内径側に挿入した後、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、前記トーションバーを前記第一シャフトの内径側に挿入した後、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、該滑りブッシュ挿入穴に滑りブッシュを挿入した、
請求項1に記載した電動式パワーステアリング装置。 - 前記第二シャフトに設けられた前記連結孔部と連結する前記他方の連結軸部は、前記滑りブッシュと接触するように軸方向に長く形成される、請求項13に記載した電動式パワーステアリング装置。
- 請求項10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を前記第一シャフトの内径側に配置すると共に、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、
電動式パワーステアリング装置の組立方法。 - 請求項11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を前記第一シャフトの内径側に挿入し、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、
電動式パワーステアリング装置の組立方法。 - 請求項12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、
電動式パワーステアリング装置の組立方法。
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US15/102,603 US10099718B2 (en) | 2014-03-05 | 2015-01-09 | Electric power steering device and method for assembling the same |
CN201580002898.9A CN105793139B (zh) | 2014-03-05 | 2015-01-09 | 电动式助力转向装置及其组装方法 |
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