WO2014069422A1 - 電動式パワーステアリング装置 - Google Patents
電動式パワーステアリング装置 Download PDFInfo
- Publication number
- WO2014069422A1 WO2014069422A1 PCT/JP2013/079176 JP2013079176W WO2014069422A1 WO 2014069422 A1 WO2014069422 A1 WO 2014069422A1 JP 2013079176 W JP2013079176 W JP 2013079176W WO 2014069422 A1 WO2014069422 A1 WO 2014069422A1
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- WO
- WIPO (PCT)
- Prior art keywords
- intermediate plate
- output shaft
- outer peripheral
- electric power
- gear housing
- Prior art date
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
- B62D5/0403—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear characterised by constructional features, e.g. common housing for motor and gear box
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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
Definitions
- the present invention relates to an electric power steering apparatus that has an electric motor as an auxiliary power source and reduces a steering force that is a force for a driver to operate a steering wheel.
- the rotation of the steering wheel 1 is transmitted to the input shaft 3 of the steering gear unit 2, and the pair of left and right tie rods 4, 4 are pushed and pulled along with the rotation of the input shaft 3.
- the steering angle is given to the front wheels.
- the steering wheel 1 is supported and fixed to the rear end portion of the steering shaft 5.
- the steering shaft 5 is rotatably supported by the steering column 6 while being inserted through the cylindrical steering column 6 in the axial direction.
- a front end portion of the steering column 6 is connected and fixed to a rear end portion of a housing 9 that houses a worm speed reducer 7 and a torque measuring device 8 (see FIG. 16) constituting an electric power steering apparatus.
- An electric motor 10 that is a power source of the electric power steering device is supported and fixed to the housing 9.
- the torque measuring device 8 includes an input shaft 12, an output shaft 13, and a displacement measuring device 14 (see FIG. 16) configured to measure a relative displacement amount in the rotational direction of the input shaft 12 and the output shaft 13. Is provided.
- the input shaft 12 and the output shaft 13 are rotatably supported in the housing 9 and are coupled to each other by a torsion bar 11. Since the configuration and operation of such a torque measuring device 8 are well known, detailed description thereof will be omitted.
- the electric motor 10 Based on the measurement result of the torque measuring device 8, the electric motor 10 gives auxiliary torque in the same direction as the operation direction of the steering wheel 1 to the output shaft 13, and the output shaft 13 is input from the steering shaft 5 to the input shaft 12. The motor is rotated with a torque larger than the generated torque.
- the front end portion of the output shaft 13 is connected to the rear end portion of the intermediate shaft 16 through a universal joint 15a.
- the front end portion of the intermediate shaft 16 is connected to the input shaft 3 via another universal joint 15b.
- the front-rear direction is the front-rear direction of the vehicle in a state where the electric power steering device is incorporated in the vehicle, and includes the direction inclined with respect to the horizontal direction.
- the automobile steering device shown in FIG. 15 incorporates a tilt mechanism configured to adjust the vertical position of the steering wheel 1 and a telescopic mechanism configured to adjust the front-rear position.
- An intermediate portion of the steering column 6 is supported by a support bracket 18 supported by the vehicle body 17 so that the vertical position and the front-back position can be adjusted.
- the support cylinder 19 is provided at the front upper end portion of the housing 9 and is supported by the vehicle body 17 so as to be capable of swinging displacement about the horizontal axis.
- the steering shaft 5 has an inner shaft and an outer shaft which are combined to be able to transmit torque and extend and retract
- the steering column 6 is an outer column and inner column which are combined to expand and contract. And have.
- FIG. 16 shows a structure described in Patent Document 1
- FIG. 17 shows a structure described in Patent Document 2 as a more specific structure of the electric power steering apparatus as described above.
- the housing 9 a for housing components other than the electric motor 10 (see FIG. 15) of the electric power steering apparatus is configured by combining the gear housing 20 and the housing cover 21.
- the output shaft 13 is rotated inside the housing 9 a by a front side rolling bearing 22 held on the inner peripheral surface of the front end portion of the gear housing 20 and a rear side rolling bearing 23 held on the inner peripheral surface of the front end portion of the housing cover 21. It is supported freely.
- the input shaft 12 is rotatably supported inside the housing cover 21 by another rolling bearing 24 (radial needle bearing) held on the inner peripheral surface of the intermediate portion of the housing cover 21.
- a partition plate 25 is fitted inside a portion near the rear end inside the gear housing 20a.
- An elastic material 26 is sandwiched between the outer peripheral surface of the partition plate 25 and the inner peripheral surface of the gear housing 20a.
- the output shaft 13a is rotatable inside the housing 9b by a front rolling bearing 22a held on the inner peripheral surface of the front end portion of the gear housing 20a and a rear rolling bearing 23a held on the inner peripheral surface of the partition plate 25. It is supported by.
- the input shaft 12a is rotatably supported inside the housing cover 21a by another rolling bearing 24a. Since the structure shown in FIG. 17 does not have a telescopic mechanism, neither the steering shaft 5a nor the steering column 6a is telescopic.
- the housing 9a is formed by combining the gear housing 20 and the housing cover 21, and the output shaft 13 can be freely rotated into the housing 9a by the front side rolling bearing 22 and the rear side rolling bearing 23. To support. Such work is troublesome and reduces the manufacturing efficiency of the electric power steering apparatus.
- An object of the present invention is to provide an electric power steering device that can be easily assembled and can maintain sufficient performance over a long period of time.
- an electric power steering apparatus includes an output shaft, a gear housing, a first rolling bearing and a second rolling bearing, a housing cover, and an intermediate plate.
- the output shaft rotates to give a steering angle to the wheels.
- the gear housing has a through-hole that rotatably supports the output shaft on the inside, and is configured to house a speed reducer for reducing the rotation of the drive shaft of the electric motor and transmitting it to the output shaft.
- the first rolling bearing and the second rolling bearing are provided apart from each other in the axial direction of the output shaft in order to rotatably support the output shaft with respect to the gear housing.
- the housing cover is coupled and fixed to the gear housing, and is configured such that an input shaft that is rotationally driven by a steering shaft that is rotationally driven based on an operation of the steering wheel is inserted.
- the first rolling bearing is provided between the inner peripheral surface of the through hole and the outer peripheral surface of the output shaft.
- the second rolling bearing is provided between the inner peripheral surface of the intermediate plate and the outer peripheral surface of the output shaft.
- the intermediate plate has an outer peripheral edge supported and fixed to the opening of the gear housing.
- the rear surface of the inner peripheral surface of the gear housing may be provided with a stepped surface facing rearward, and the outer peripheral edge of the intermediate plate may be sandwiched between the stepped surface and the front end surface of the housing cover.
- the intermediate plate may be press-fitted and fixed to the rear part of the inner peripheral surface of the gear housing by an interference fit.
- a step surface facing rearward is provided at the rear end of the gear housing, and the front surface of the outer peripheral edge of the intermediate plate is located on this step surface so that the intermediate plate is positioned with respect to the gear housing with respect to the axial direction of the output shaft. It may be abutted.
- the front end surface of the housing cover may be abutted against the rear surface of the outer peripheral edge of the intermediate plate.
- a protrusion may be formed in the circumferential direction on the rear surface of the outer peripheral edge of the intermediate plate, and the protrusion may be crushed by the front end surface of the housing cover.
- a plurality of protrusions may be formed along the circumferential direction on the rear surface of the outer peripheral edge of the intermediate plate, and the protrusions may be crushed by the front end surface of the housing cover.
- the first rolling bearing may be provided in an intermediate portion of the output shaft, and the second rolling bearing may be provided in a portion of the output shaft closer to the rear end of the output shaft than the intermediate portion.
- the intermediate plate may be made by injection molding of a thermoplastic resin containing a thermosetting resin or glass fiber.
- One of the two rolling bearings that rotatably support the output shaft with respect to the gear housing is provided between the inner peripheral surface of the intermediate plate and the outer peripheral surface of the output shaft. Since the intermediate plate is assembled in a state in which the rolling bearing can be seen before the housing cover is assembled, the assembly work of the electric power steering apparatus can be facilitated.
- the intermediate plate is supported and fixed to the opening of the gear housing.
- the performance of the electric power steering apparatus can be maintained over a long period of time. That is, since the intermediate plate is supported and fixed to the gear housing, the posture of the rolling bearing held on the inner peripheral surface of the intermediate plate does not change even after use for a long period of time. For this reason, the attitude of the output shaft that is rotatably supported by the rolling bearing does not change, and the meshing state of the speed reducer does not become poor, and the measurement accuracy of the torque measuring device does not deteriorate.
- FIG. 1 is a partial cross-sectional view of an electric power steering apparatus according to a first embodiment of the present invention.
- the enlarged view of the A section of FIG. The front perspective view of the gear housing of an electric power steering device.
- FIG. 6 is a partial cross-sectional view of an electric power steering apparatus according to a second embodiment of the present invention. Sectional drawing of a part of electric power steering device which concerns on 3rd Embodiment of this invention.
- FIG. 9 The enlarged view similar to FIG. 9 which shows 4th Embodiment of this invention.
- FIG. 9 which shows 5th Embodiment of this invention.
- middle plate which concerns on 6th Embodiment of this invention.
- the partial expanded sectional view which shows the other example of the cross-sectional shape of a protrusion or a protrusion.
- the partial expanded sectional view which shows the further another example of the cross-sectional shape of a protrusion or a protrusion.
- the partial expanded sectional view which shows the further another example of the cross-sectional shape of a protrusion or a protrusion.
- the partial cutting side view which shows an example of an electric power steering device. Sectional drawing of the electric power steering apparatus which concerns on a 1st prior art. Sectional drawing of the electric power steering apparatus which concerns on a 2nd prior art.
- the electric power steering apparatus includes an input shaft 12b, an output shaft 13b, and a housing 9 that rotatably supports the input shaft 12b and the output shaft 13b.
- the housing 9 is configured by combining a gear housing 20b and a housing cover 21b.
- Each of the gear housing 20b and the housing cover 21b is formed by, for example, die casting using an aluminum alloy or injection molding using a high-functional resin.
- the input shaft 12b and the output shaft 13b are formed in a hollow circular tube, and are connected by the torsion bar 11 in a state of being arranged concentrically with each other.
- the output shaft 13b is connected to the input shaft 3 (see FIG. 15) of the steering gear unit 2 via the universal joints 15a and 15b and the intermediate shaft 16, and rotates the input shaft 3 in a predetermined direction by a predetermined amount, thereby Is configured to give a predetermined steering angle.
- the input shaft 12b is configured to be rotationally driven by the steering shaft 5.
- the input shaft 12b and the output shaft 13b elastically deform the torsion bar 11 in the twisting direction by the steering torque applied to the input shaft 12b and the resistance against the rotation of the output shaft 13b.
- This relative displacement amount can be measured by a torque measuring device 8b provided between the outer peripheral surface of the intermediate portion of the input shaft 12b and the outer peripheral surface of the rear end portion of the output shaft 13b.
- the measurement signal from the torque measuring device 8b is sent to a controller configured to control energization to the electric motor 10 (see FIG. 15).
- the controller controls the energization direction and the energization amount to the electric motor 10, and applies an auxiliary steering force to the output shaft 13b via the worm reducer 7a.
- a radial needle bearing 27 is provided between the outer peripheral surface of the front end portion of the input shaft 12b and the rear end portion of the inner peripheral surface of the output shaft 13b, and concentricity between the input shaft 12b and the output shaft 13b is ensured. .
- An intermediate plate 28 made in the same manner as the gear housing 20b and the housing cover 21b is supported and fixed in the housing 9c.
- the intermediate plate 28 is used to support a portion near the rear end of the intermediate portion of the output shaft 13b.
- a step surface 29 facing rearward is provided in a portion near the rear end opening of the inner peripheral surface of the gear housing 20b.
- the outer peripheral edge portion of the intermediate plate 28 is sandwiched between the step surface 29 and the front end surface of the housing cover 21b.
- Coupling flanges 30a and 30b are respectively provided at portions where the outer peripheral surface of the housing cover 21b and the outer peripheral surface of the gear housing 20b are engaged with each other at two positions opposite to each other in the diameter direction.
- the output shaft 13b is rotatably supported by the front rolling bearing 22b and the rear rolling bearing 23b on the radially inner side of the gear housing 20b and the intermediate plate 28 that are coupled and fixed in this manner.
- the outer ring of the front rolling bearing 22b is formed on the inner side of the through hole 32 formed in the center part of the gear housing 20b along the front-rear direction and having a stepped surface facing the rear in the middle part of the inner peripheral surface. And is retained by a radially outer retaining ring 33.
- the inner ring of the front rolling bearing 22b is externally fitted to the output shaft 13b together with the worm wheel 34 of the worm reduction gear 7a from the front, and the rear inner peripheral edge of the worm wheel 34 is formed on the outer peripheral surface of the output shaft 13b. While being abutted against the stepped surface that faces, it is prevented from coming off by a radially inner retaining ring 35.
- the outer ring of the rear side rolling bearing 23b is internally fitted and fixed to the cylindrical portion 36 formed at the center of the intermediate plate 28 by an interference fit.
- a plurality of reinforcing ribs 37 arranged in the circumferential direction are formed between the outer peripheral surface of the cylindrical portion 36 and the front side surface of the intermediate plate 28, and the rigidity of the cylindrical portion 36, that is, the rear rolling bearing 23 b is formed. Support rigidity is ensured.
- Each of the reinforcing ribs 37 extends in the radial direction and protrudes in the axial direction.
- the inner ring of the rear rolling bearing 23b is externally fitted and fixed to the large-diameter portion formed near the rear end of the intermediate portion of the output shaft 13b and having a larger outer diameter than both the front and rear side portions.
- the inner peripheral edge of the rear surface of the worm wheel 34 is abutted against the stepped surface that continues from the front edge of the large diameter portion.
- the position of the cylindrical portion 36 of the intermediate plate 28 and the position of the outer peripheral edge of the intermediate plate 28 are shifted in the axial direction.
- the inner ring of the rear side rolling bearing 23b may be fitted on the output shaft 13b by gap fitting. This gap fitting absorbs thermal deformation in the axial direction of the intermediate plate 28. That is, the rear side rolling bearing 23 b is not affected by the axial thermal deformation of the intermediate plate 28. Therefore, the performance of the electric power steering apparatus is not affected by the axial thermal deformation of the intermediate plate 28.
- the front rolling bearing 22b is held inside the through hole 32 of the gear housing 20b. deep. In this state, the radially outer retaining ring 33 is also attached. Since this operation is performed before other members are assembled in the gear housing 20b, it can be easily performed.
- the worm wheel 34, the rear rolling bearing 23b, and the intermediate plate 28 are attached to the portion near the rear end of the outer peripheral surface of the output shaft 13b.
- the input shaft 12b is also coupled to the output shaft 13b via the torsion bar 11, and the torque measuring device 8b is also assembled. Further, the input shaft 12b and the steering shaft 5 are coupled as necessary. Since these operations are also performed before the output shaft 13b is assembled in the gear housing 20b, it can be easily performed.
- the housing cover 21b is loosely fitted to the steering shaft 5 in advance as required, and is moved rearward so as not to hinder the assembly work of other members.
- the output shaft 13b is inserted into the inner ring of the front rolling bearing 22b from the rear to the front, and the rear end face of the inner ring and the front end face of the radially inner end of the worm wheel 34 are brought into contact with each other. Then, a radially inner retaining ring 35 is attached. In this state, the outer peripheral edge of the front surface of the intermediate plate 28 abuts on the step surface 29. Therefore, the housing cover 21b is moved forward so that the front end portion of the housing cover 21b is fitted into the rear end portion of the gear housing 20b, and the front side surface of the flange portion 31 is abutted against the rear end surface of the gear housing 20b. .
- each coupling flange 30a, 30b is adjusted, and each coupling flange 30a, 30b is bolted with a bolt and a nut, or a bolt inserted through a through hole formed in one coupling flange 30b, 30b,
- the other coupling flanges 30a and 30a are coupled and fixed by screwing into the screw holes formed in the other coupling flanges 30a and 30a and further tightening. Since a series of these operations can be performed with visual confirmation, it is easy.
- the worm wheel 34 and the worm constituting the worm speed reducer 7a mesh with each other while rotating the worm when the electric motor 10 is assembled to the gear housing 20b. This is the same as the conventional structure.
- the intermediate plate 28 is firmly supported and fixed inside the housing 9c including the gear housing 20b and the housing cover 21b. Accordingly, the posture of the rear rolling bearing 23b held on the inner peripheral surface of the cylindrical portion 36 of the intermediate plate 28 does not change even after use for a long period of time. For this reason, even if it is used over a long period of time, the posture of the output shaft 13b that is rotatably supported by the rear side rolling bearing 23b and the front side rolling bearing 22b does not change. As a result, the meshing state of the worm speed reducer 7a does not become defective, and the measurement accuracy of the torque measuring device 8b does not deteriorate.
- the intermediate plate 28 can be made by injection molding of synthetic resin.
- synthetic resin that can be preferably used include a thermosetting resin or a thermoplastic resin containing about 20 to 60% by volume of reinforcing fibers.
- this resin is made of a resin composition that can be used continuously even in a temperature environment of ⁇ 40 ° C. to 85 ° C., which is the operating environment temperature in the column portion of the electric power steering device, and can be used continuously.
- the linear expansion coefficient is 1.2 ⁇ 10 ⁇ 5 in both the fiber direction and the fiber perpendicular direction in the temperature range of 23 ° C. to 80 ° C. It is preferably in the range of 5.5 ⁇ 10 ⁇ 5 (1 / ° C.), and the water absorption when left in water at 23 ° C. for 24 hours is preferably 4% or less.
- the resin portion when exposed to a high temperature and high humidity environment for a long time during transportation or the like, the resin portion may be damaged due to a decrease in mechanical properties due to moisture absorption deterioration of the intermediate plate formed of the resin. Therefore, the resin preferably has a tensile strength retention of 70% or more after being left in an environment of 85 ° C. and 85% RH for 500 hours.
- the resin composition that can be continuously used in a temperature environment of ⁇ 40 ° C. to 85 ° C. is not particularly limited, but includes polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyamide (PA) 6, polyamide 11, So-called engineering plastics such as polyamide 12, polyamide 66, polyamide 610, polyamide 612, polyamide 46, polyamide 410, modified polyamide 6T, polyamide 9T, fluororesin, polyphenylene sulfide (PPS), polyethersulfone (PES), polyetherimide (PEI), polyamideimide (PAI), thermoplastic polyimide, polyetheretherketone (PEEK), so-called super engineering plastics such as polyethernitrile (PEN) Can be exemplified fat, it may be used alone or in combination.
- PPS polyethersulfide
- PES polyethersulfone
- PAI polyetherimide
- PEEK polyetheretherketone
- super engineering plastics such as
- polyethylene terephthalate (PET), polyamide 66, polyamide 46, and polyphenylene sulfide have a good balance between cost and performance, and can be suitably used.
- thermosetting resins such as phenol resins, urea resins, unsaturated polyester resins, and polyurethane resins can be suitably used for applications requiring heat resistance and dimensional stability.
- the linear expansion coefficient should be in the range of 1.2 ⁇ 10 ⁇ 5 to 5.5 ⁇ 10 ⁇ 5 (1 / ° C.) in the fiber direction and in the direction perpendicular to the fiber in the temperature range of 23 ° C. to 80 ° C. Is preferred.
- the linear expansion coefficient is smaller than 1.2 ⁇ 10 ⁇ 5 (1 / ° C.)
- the linear expansion coefficient of the rear side rolling bearing 23 press-fitted radially inward of the intermediate plate 28 is 1.2 ⁇ 10 ⁇ 5 (1 Therefore, there is a difference between the linear expansion coefficient of the intermediate plate 28 and the linear expansion coefficient of the rear rolling bearing 23, and a gap is formed between the cylindrical portion 36 and the outer diameter surface of the rear rolling bearing 23.
- the fibrous filler is not particularly limited, and examples thereof include glass fiber, carbon fiber, metal fiber, aramid fiber, aromatic polyimide fiber, liquid crystal polyester fiber, silicon carbide fiber, alumina fiber, and boron fiber. It can. Among these, glass fiber and carbon fiber are preferable because of their good reinforcement. As the glass fiber, an insulating glass fiber that has little influence on the electromagnetic induction of the torque measuring device 8 is more preferable.
- the content of the fibrous filler in the total composition is preferably 30 to 55% by mass, more preferably 35 to 55% by mass. Even if the fibrous filler exceeds 55% by mass, not only the melt fluidity of the resin composition is remarkably lowered and the moldability is deteriorated, but further improvement in mechanical properties and dimensional stability is expected. On the other hand, since the deformability of the material becomes extremely small, the intermediate plate 28 may be damaged when the intermediate plate 28 is molded or assembled. Conversely, if the content of the fibrous filler in the entire composition is less than 30% by mass, the reinforcing effect of mechanical properties is small, and the dimensional stability is insufficient.
- the dimensional stability means that the linear expansion coefficient is 1.2 ⁇ 10 ⁇ 5 to 5.5 ⁇ 10 ⁇ 5 (1 / ° C), which means that the water absorption when left in water at 23 ° C for 24 hours is in the range of 4% or less.
- the resin forming the intermediate plate 28 is made of a silane-based fibrous filler so as to improve the adhesion and dispersibility between the resin and the fibrous filler by giving affinity between the resin and the fibrous filler.
- a silane-based fibrous filler so as to improve the adhesion and dispersibility between the resin and the fibrous filler by giving affinity between the resin and the fibrous filler.
- it can treat with coupling agents, such as a coupling agent and a titanate coupling agent, and the surface treatment agent according to the other objective, it is not limited to these.
- additives may be added within the range not impairing the object of the present invention, such as graphite, hexagonal boron nitride, fluorine mica, tetrafluoroethylene resin powder, tungsten disulfide, molybdenum disulfide, etc.
- a functional epoxy compound, a piperidine derivative, a piperazinone derivative, or the like can be preferably used.
- the hydrolysis inhibitor may be added in an amount of 0.01 to 5% by mass, preferably 0.05 to 2% by mass, based on the polyester resin.
- the temperature at the time of melt impregnation is not particularly limited, but may be appropriately selected within a temperature range in which the melting of the resin as the base material sufficiently proceeds and does not deteriorate.
- the method for manufacturing the intermediate plate 28 is not particularly limited.
- the intermediate plate 28 can be formed by an ordinary method such as injection molding, compression molding, transfer molding, or the like.
- the injection molding method is preferable because it is excellent in productivity and can provide an inexpensive intermediate plate 28.
- the intermediate plate 28 can also be made by die casting of a light alloy such as an aluminum alloy.
- FIG. 7 shows a second embodiment of the present invention.
- the intermediate plate 28a is between the front flange portion 38 formed on the outer peripheral surface of the rear end portion of the gear housing 20c and the rear flange portion 39 formed on the outer peripheral surface of the front end portion of the housing cover 21c.
- An intermediate flange portion 40 formed on the outer peripheral surface is sandwiched. In this state, the peripheral surfaces of the members 20c, 21c, and 28a are fitted to each other so that the radial positions of the members 20c, 21c, and 28a are positioned.
- an intermediate plate 28 made in the same manner as the gear housing 20b and the housing cover 21b is press-fitted and fixed in the housing 9c by an interference fit.
- the intermediate plate 28 is used to support the intermediate portion rear end portion of the output shaft 13b.
- a stepped surface 29 facing rearward is provided in a portion near the rear end opening of the inner peripheral surface of the gear housing 20b. .
- the rear side portion of the step surface 29 is divided into a small-diameter portion 45 near the step surface 29 and the large-diameter portion 46 on the opening side far from the step surface 29. It is made into the stepped cylindrical surface shape made continuous by the part.
- the outer diameter of the intermediate plate 28 in the free state is slightly larger than the inner diameter of the small diameter portion 45 in the free state.
- the inner diameter of the large-diameter portion 46 in the free state is slightly larger than the outer diameter of the intermediate plate 28 in the free state.
- the intermediate plate 28 is press-fitted into the small-diameter portion 45, and the front outer peripheral edge of the intermediate plate 28 is abutted against the stepped surface 29, so that the intermediate plate 28 is press-fitted and fixed at a predetermined position in the housing 9c. .
- the rear end opening of the gear housing 20b is closed by the housing cover 21b.
- Coupling flanges 30a and 30b are provided at portions where the outer peripheral surface of the gear housing 20b and the outer peripheral surface of the housing cover 21b are engaged with each other at two positions opposite to each other in the diameter direction.
- the intermediate plate 28 is press-fitted and fixed in the gear housing 20b, and the front end portion of the housing cover 21b is fitted into the large diameter portion 46 of the rear end opening portion of the gear housing 20b without rattling.
- the front side surface of the flange portion 31 formed on the rear end surface near the front end portion of the outer peripheral surface of the housing cover 21b is abutted against the rear end surface.
- the output shaft 13b is assembled to each other in this manner, and is rotatably supported by front and rear rolling bearings 22b and 23b in a gear housing 20b in which an intermediate plate 28 is press-fitted and fixed.
- the output shaft 13b when the output shaft 13b is assembled in the gear housing 20b, the output shaft 13b is inserted into the inner ring of the front rolling bearing 22b from the rear while the intermediate plate 28 is press-fitted into the small diameter portion 45 of the gear housing 20b. Inserted forward, the rear end surface of the inner ring and the front end surface of the radially inner end of the worm wheel 34 abut against each other. Then, a radially inner retaining ring 35 is attached. In this state, the outer peripheral edge of the front surface of the intermediate plate 28 abuts on the step surface 29.
- each coupling flange 30a, 30b is adjusted, and each coupling flange 30a, 30b is bolted with a bolt and a nut, or a bolt inserted through a through hole formed in one coupling flange 30b, 30b,
- the other coupling flanges 30a and 30a are coupled and fixed by being screwed into the screw holes formed therein and further tightened.
- the intermediate plate 28 is firmly supported and fixed inside the housing 9c including the gear housing 20b and the housing cover 21b. Accordingly, the posture of the rear rolling bearing 23b held on the inner peripheral surface of the cylindrical portion 36 of the intermediate plate 28 does not change even after use for a long period of time. For this reason, even if it is used over a long period of time, the posture of the output shaft 13b that is rotatably supported by the rear side rolling bearing 23b and the front side rolling bearing 22b does not change. As a result, the meshing state of the worm speed reducer 7a does not become defective, and the measurement accuracy of the torque measuring device 8b does not deteriorate. Since the configuration and operation of the other parts are the same as those of the first embodiment described above, the same parts are denoted by the same reference numerals, and redundant description is omitted.
- FIG. 10 shows a fourth embodiment of the present invention.
- the front end surface of the housing cover 21 c is abutted against the outer peripheral edge of the rear surface of the intermediate plate 28. Therefore, in the case of this example, the fixing force of the intermediate plate 28 with respect to the housing 9d is a friction force acting between the outer peripheral surface of the intermediate plate 28 and the small-diameter portion 45 of the gear housing 20b based on press-fitting. This is the total of the clamping force by the step surface 29 on the gear housing 20b side and the front end surface of the housing cover 21c. Therefore, the fixing strength of the intermediate plate 28 with respect to the housing 9d becomes higher. Since the configuration and operation of the other parts are the same as those of the third embodiment described above, the same parts are denoted by the same reference numerals, and redundant description is omitted.
- a protrusion 50 is formed over the entire circumference on the outer peripheral edge of the rear surface of the intermediate plate 28a, with a triangular cross-section that decreases in width in the radial direction toward the tip.
- the front end surface of the housing cover 21b is applied to the outer peripheral edge of the rear surface of the intermediate plate 28a while crushing the protrusion 50 with the front end surface of the housing cover 21b. I'm hitting it.
- the protrusion 50 is crushed in the process of screwing and tightening the bolt and nut (or screw hole) in order to connect and fix the gear housing 20b and the housing cover 21b. It is. For this reason, it is possible to prevent the bolt from loosening while keeping the force required for tightening the bolt low (reducing the loss of axial force). Since the configuration and operation of the other parts are the same as those in the above-described fourth embodiment, illustration and description regarding the equivalent parts are omitted.
- FIG. 13 shows a sixth embodiment of the present invention.
- triangular pyramid-shaped protrusions 51 and 51 are formed at a plurality of circumferentially equidistant positions on the outer peripheral edge of the rear surface of the intermediate plate 28b. Then, in the process of coupling and fixing the gear housing 20b and the housing cover 21b (see FIG. 8), the front end surface of the housing cover 21b is squeezed by the intermediate plate while the projections 51 and 51 are crushed by the front end surface of the housing cover 21b. It abuts on the outer peripheral edge of the rear surface 28b.
- the cross-sectional shape of the protrusion 50 or the protrusion 51 is not restricted to a triangle.
- the cross-sectional shape as shown in FIG. 14A is a trapezoidal protrusion 50a (or a truncated cone-shaped protrusion 51a), and the cross-sectional shape as shown in FIG.
- the protrusion 50b (or columnar protrusion 51b), or the protrusion 50c (or hemispherical protrusion 51c) having a semicircular cross-sectional shape as shown in FIG. 14B can also be used.
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Abstract
Description
3 入力軸
5、5a、5b ステアリングシャフト
7、7a ウォーム減速機
10 電動モータ
12、12a、12b、12c 入力軸
13、13a、13b 出力軸
20、20a、20b、20c ギヤハウジング
21、21a、21b、21c ハウジングカバー
22、22a、22b 第1転がり軸受
23、23a、23b 第2転がり軸受
28、28a 中間プレート
29 段差面
30a、30b 結合フランジ
32 貫通孔
38 前側フランジ部
39 後側フランジ部
40 中間フランジ部
50、50a、50b、50c 突条
51、51a、51b、51c 突起
Claims (10)
- 回転して車輪に舵角を付与する出力軸と、
内側に前記出力軸を回転自在に支持する貫通孔を有し、電動モータの駆動軸の回転を減速して前記出力軸に伝達する為の減速機を収納するように構成されたギヤハウジングと、
前記ギヤハウジングに対して前記出力軸を回転自在に支持する為、前記出力軸の軸方向に離隔して設けられた、第1転がり軸受および第2転がり軸受と、
前記ギヤハウジングに結合固定され、ステアリングホイールの操作に基づいて回転駆動されるステアリングシャフトにより回転駆動される入力軸が挿通されるように構成されたハウジングカバーと、
中間プレートと、を備えた電動式パワーステアリング装置にであって、
前記第1転がり軸受は、前記貫通孔の内周面と前記出力軸の外周面との間に設けられ、
前記第2転がり軸受は、前記中間プレートの内周面と、前記出力軸の外周面との間に設けられ、
前記中間プレートは、前記ギヤハウジングの開口部に支持固定された外周縁部を有する、電動式パワーステアリング装置。 - 前記ギヤハウジングの内周面の後部に、後方を向いた段差面が設けられ、
前記中間プレートの外周縁部は、前記段差面と前記ハウジングカバーの前端面との間で挟持されている、請求項1に記載した電動式パワーステアリング装置。 - 前記ギヤハウジングの後端部の外周面に形成された前側フランジ部と、
前記ハウジングカバーの前端部の外周面に形成された後側フランジ部と、
前記中間プレートの外周面に形成された中間フランジ部と、をさらに備え、
前記中間フランジ部は、前記前側フランジ部と前記後側フランジ部との間で挟持されている、請求項1に記載した電動式パワーステアリング装置。 - 前記中間プレートは、前記ギヤハウジングの内周面の後部に締り嵌めにより圧入固定されている、請求項1に記載した電動式パワーステアリング装置。
- 前記ギヤハウジングの内周面の後部に、後方を向いた段差面が設けられ、
前記中間プレートが前記ギヤハウジングに対して前記出力軸の軸方向に関して位置決めされるように、前記中間プレートの外周縁部の前面が前記段差面に突き当てられている、請求項4に記載した電動式パワーステアリング装置。 - 前記ハウジングカバーの前端面は、前記中間プレートの外周縁部の後面に突き当てられている、請求項5に記載した電動式パワーステアリング装置。
- 前記中間プレートの外周縁部の後面には、突条が周方向に形成され、
前記突条は、前記ハウジングカバーの前端面により押し潰されている、請求項6に記載した電動式パワーステアリング装置。 - 前記中間プレートの後面外周縁部の後面には、複数の突起が周方向に沿って形成され、
前記突起は、前記ハウジングカバーの前端面により押し潰されている、請求項6に記載した電動式パワーステアリング装置。 - 前記第1転がり軸受は、前記出力軸の中間部に設けられ、
前記第2転がり軸受は、前記中間部よりも出力軸の後端寄りの出力軸の部分に設けられている、請求項1に記載した電動式パワーステアリング装置。 - 前記中間プレートは、熱硬化性樹脂又はガラス繊維を含有する熱可塑性樹脂の射出成形により造られている、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。
Priority Applications (4)
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US14/387,700 US10059364B2 (en) | 2012-10-29 | 2013-10-28 | Electric power steering apparatus |
JP2013556698A JP6024673B2 (ja) | 2012-10-29 | 2013-10-28 | 電動式パワーステアリング装置 |
CN201380001906.9A CN104024087A (zh) | 2012-10-29 | 2013-10-28 | 电动式动力转向装置 |
EP13850639.9A EP2913245B1 (en) | 2012-10-29 | 2013-10-28 | Electric power-steering device |
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EP (1) | EP2913245B1 (ja) |
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Also Published As
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EP2913245B1 (en) | 2019-03-27 |
EP2913245A4 (en) | 2015-11-11 |
CN104024087A (zh) | 2014-09-03 |
JPWO2014069422A1 (ja) | 2016-09-08 |
US10059364B2 (en) | 2018-08-28 |
JP6024673B2 (ja) | 2016-11-16 |
US20150298724A1 (en) | 2015-10-22 |
EP2913245A1 (en) | 2015-09-02 |
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