WO2013047048A1 - テレスコピックステアリング装置 - Google Patents
テレスコピックステアリング装置 Download PDFInfo
- Publication number
- WO2013047048A1 WO2013047048A1 PCT/JP2012/071566 JP2012071566W WO2013047048A1 WO 2013047048 A1 WO2013047048 A1 WO 2013047048A1 JP 2012071566 W JP2012071566 W JP 2012071566W WO 2013047048 A1 WO2013047048 A1 WO 2013047048A1
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- WIPO (PCT)
- Prior art keywords
- elastic sleeve
- column
- end portion
- peripheral surface
- steering
- Prior art date
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D1/00—Steering controls, i.e. means for initiating a change of direction of the vehicle
- B62D1/02—Steering controls, i.e. means for initiating a change of direction of the vehicle vehicle-mounted
- B62D1/16—Steering columns
- B62D1/18—Steering columns yieldable or adjustable, e.g. tiltable
- B62D1/185—Steering columns yieldable or adjustable, e.g. tiltable adjustable by axial displacement, e.g. telescopically
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D1/00—Steering controls, i.e. means for initiating a change of direction of the vehicle
- B62D1/02—Steering controls, i.e. means for initiating a change of direction of the vehicle vehicle-mounted
- B62D1/16—Steering columns
- B62D1/18—Steering columns yieldable or adjustable, e.g. tiltable
- B62D1/184—Mechanisms for locking columns at selected positions
Definitions
- the present invention relates to an improvement of a telescopic steering device for adjusting the front-rear position of the steering wheel.
- FIG. 18 shows a conventional example of a steering device for an automobile.
- the steering device transmits the rotation of the steering wheel 1 to the input shaft 3 of the steering gear unit 2 and pushes and pulls the pair of left and right tie rods 4 along with the rotation of the input shaft 3 to give a steering angle to the front wheels.
- the steering wheel 1 is supported and fixed at the rear end portion of the steering shaft 5.
- the steering shaft 5 is rotatably supported by the steering column 6 with the cylindrical steering column 6 inserted in the axial direction.
- the front end portion of the steering shaft 5 is connected to the rear end portion of the intermediate shaft 8 via the universal joint 7, and the front end portion of the intermediate shaft 8 is connected to the input shaft 3 via another universal joint 9. .
- the steering device As the steering device, a structure having a tilt mechanism for adjusting the vertical position of the steering wheel 1 and a telescopic mechanism for adjusting the front-rear position according to the physique and driving posture of the driver is widely adopted.
- the steering column 6 In order to constitute a tilt mechanism, the steering column 6 is supported with respect to the vehicle body 10 so as to be able to swing and swing around a pivot 11 installed in the width direction.
- a displacement bracket fixed to a portion near the rear end of the steering column 6 is supported with respect to the support bracket 12 supported on the vehicle body 10 so as to be able to be displaced in the vertical direction and the front-rear direction.
- the width direction means the width direction of the vehicle body and is synonymous with the left-right direction.
- the front-rear direction means the front-rear direction of the vehicle body.
- the steering column 6 has a structure in which the outer column 13 and the inner column 14 are telescopically combined so that the steering shaft 5 can be extended.
- the shaft 15 and the inner shaft 16 are combined in a manner that allows torque transmission and expansion and contraction by spline engagement or the like.
- the illustrated example also incorporates an electric power steering device that uses the electric motor 17 as an auxiliary power source to reduce the force required to operate the steering wheel 1.
- the tilt mechanism and the telescopic mechanism are configured so that the position of the steering wheel 1 can be adjusted or fixed at the adjusted position based on the operation of the adjustment handle, except for the electric mechanism.
- 19 to 20 show an example of a conventional structure described in Japanese Patent Laid-Open No. 2001-322552.
- the axial dimension of the cam device 20 is expanded and contracted based on the rotation of the adjusting rod 19 by the adjusting handle 18, and at the same time, the cam member 21 is oscillated and displaced, and the outer column is expanded based on the expansion and contraction of the cam device 20.
- the displacement bracket 22 fixed to 13a is engaged with and disengaged from the support bracket 12a. Further, based on the rocking displacement of the cam member 21, whether or not the inner column 14a can slide with respect to the outer column 13a is switched.
- the adjustment rod 19 is inserted in the width direction through a vertical hole 24 formed in each of the pair of left and right support plate portions 23 constituting the support bracket 12a and a longitudinal hole 25 formed in the displacement bracket 22 in the width direction. ing.
- the adjustment handle 18 is rotated in a predetermined direction (usually downward) to cam.
- the axial dimension of the device 20 is reduced, and the cam member 21 is separated from the outer peripheral surface of the inner column 14a.
- the vertical position and the front / rear position of the steering wheel 1 can be adjusted within a range in which the adjustment rod 19 can be displaced in the vertical direction long hole 24 and the front / rear direction long hole 25.
- the adjustment handle 18 is rotated in the direction opposite to the predetermined direction (usually upward) to expand the axial dimension of the cam device 20 and the cam member 21
- the outer peripheral surface of the inner column 14a is suppressed. As a result, the steering wheel 1 is held at the adjusted position.
- a secondary collision occurs in which a driver's body collides with the steering wheel 1 following a primary collision in which the vehicle collides with another vehicle.
- the support bracket 12a is detached forward when a large impact load is applied to the vehicle body 10 (see FIG. 18). Is supported by possible.
- the steering wheel 1 is vigorously displaced to the foremost position and the rear end portion of the longitudinal long hole 25 is vigorously collided with the outer peripheral surfaces of the sleeves 26a and 26b fitted on the adjustment rod 19, the displacement bracket The impact in the same direction as the impact load applied at the time of the secondary collision is applied to the support bracket 12a via the contact 22.
- Japanese Patent Publication No. 10-512825 discloses a structure in which elastomeric elastic blocks are arranged at both ends in the longitudinal direction of the inner peripheral surface of a plastic liner corresponding to a longitudinal hole. In the case of such an improved structure, it is possible to reduce the uncomfortable feeling given to the driver during the adjustment work, and to some extent prevent the occurrence of problems due to the adjustment operation by extremely large force. It is considered a thing. However, in the case of the structure described in Japanese Patent Publication No. 10-512825, the plastic liner and the elastic block, which are separate from each other, are combined by bonding or the like, so that the assembly is troublesome and the cost is increased.
- the elastic deformation amount of the elastic block (the stroke that elastically deforms when absorbing an impact) cannot always be sufficiently ensured, and a reduction effect such as a sense of incongruity and an effect of preventing the occurrence of defects are not always sufficiently obtained.
- the present invention can further improve the effect of reducing the uncomfortable feeling given to the driver during the adjustment work and the effect of preventing the occurrence of problems based on the adjustment operation with an extremely large force.
- the purpose is to provide a possible structure.
- the telescopic steering device of the present invention includes a steering column, a displacement bracket, an elastic sleeve, a steering shaft, a support bracket, an adjustment rod, and an expansion / contraction mechanism.
- the steering column has a cylindrical shape, and includes an outer column capable of expanding and contracting at least an inner diameter of one end in the axial direction, and an inner column fitted and supported on the inner diameter side of the outer column so as to be capable of axial displacement. In combination, it can be stretched.
- the displacement bracket is fixed to one of the outer column and the inner column located on the rear side, and is displaced in the axial direction together with the one column as the steering wheel moves back and forth. .
- a long hole in the front-rear direction that is long in the axial direction of the one column is provided.
- the elastic sleeve is made of an elastic material such as an elastomer such as rubber or vinyl, or a plastic material such as a plastomer such as polypropylene (PP) or polyacetal (POM), and is mounted inside the longitudinal hole. ing.
- the elastic sleeve is a member used to relieve an impact based on elastic deformation.
- a plastomer can be used as the material constituting the elastic sleeve, but it is preferable to use an elastomer that is more easily elastically deformed and superior in impact relaxation performance based on elastic deformation as compared to the plastomer. .
- the steering shaft is rotatably supported on the inner diameter side of the steering column, and a steering wheel is fixed to a portion protruding rearward from the rear end opening of the steering column.
- a steering shaft is rotatably supported inside the one column in a state of being axially displaced together with the one column.
- the steering shaft is configured such that torque transmission and expansion and contraction are possible by combining the outer shaft and the inner shaft, one of the outer shaft and the inner shaft (rear side) is used.
- a shaft that fixes the steering wheel to the rear end portion thereof is rotatably supported inside the one column while being axially displaced together with the one column.
- the support bracket supports the steering column with respect to the vehicle body so that the front-rear position of the steering wheel can be adjusted, a pair of support plate portions sandwiching the displacement bracket from both sides in the width direction, and these And a through hole formed in a portion of the support plate portion aligned with each other.
- the adjustment rod is inserted through the through hole and the inside of the elastic sleeve attached to the inside of the longitudinal long hole in the width direction of the displacement bracket.
- the expansion / contraction mechanism expands / contracts a distance between a pair of pressing portions provided at portions facing the outer surface of the support plate portion at both end portions of the adjustment rod, whereby inner surfaces of these support plate portions are provided. Increase or decrease the distance between each other.
- a gap is interposed between the inner peripheral surface of the longitudinally long hole and the outer peripheral surface of the elastic sleeve at one end portion on the side where the adjusting rod is located. This gap increases the amount of elastic deformation of the one end portion of the elastic sleeve when the adjusting rod collides with the inner peripheral surface of the one end portion of the elastic sleeve. It functions to alleviate the impact applied to the adjustment rod from the inner peripheral surface of the one end portion.
- the outer column is disposed on the rear side
- the inner column is disposed on the front side
- the one column is the outer column
- a slit long in the axial direction is formed at the front end of the outer column.
- the inner diameter of the outer column can be elastically expanded and contracted
- the displacement bracket is formed from a pair of sandwiched plate portions fixed to the outer peripheral surface of the outer column with the slit sandwiched from both sides.
- the front and rear direction long holes are formed in these sandwiched plate parts, the one end part is a rear end part, and at least the inner peripheral surface of the rear end part of the front and rear direction long hole and the rear end part of the elastic sleeve
- the said clearance gap is provided between the outer peripheral surfaces.
- the shape of the inner peripheral surface of the one end portion of the longitudinal slot is a semicircular shape with a constant radius of curvature
- the shape of the outer peripheral surface of the one end portion of the elastic sleeve is the radius of curvature of the central portion. Is smaller than the radius of curvature of the semicircular shape, and the radius of curvature of both side portions sandwiching the central portion is larger than the radius of curvature of the semicircular shape.
- the said clearance gap exists between a surrounding surface and the outer peripheral surface of the said one end part of the said elastic sleeve.
- the shape of the inner peripheral surface of the one end portion of the longitudinally long hole is a semicircular shape with a constant radius of curvature
- the shape of the one end portion of the elastic sleeve is the central flat plate portion and the flat plate portion. It shall consist of the curved plate part of the both sides which pinch
- the cushioning performance of one end portion which is the side where the adjustment rod is located, is made higher than the cushioning performance of the other end portion, which is the side where the adjustment rod is located, in the state where the steering column is most extended.
- the thickness dimension in the front-rear direction of the one end portion is made larger than the thickness dimension in the front-rear direction of the other end portion.
- a telescopic steering device that can prevent loss of the support force of the steering column with respect to the vehicle body.
- the adjustment rod and the inner peripheral surface of the elastic sleeve at the end in the front / rear direction end vigorously collide.
- the end portion of the elastic sleeve is elastically deformed.
- the impact energy transmitted between the said adjustment rod and a support bracket is relieve
- FIG. 1 is a side view of an essential part showing a first example of an embodiment of the present invention.
- FIG. 2 is a plan view showing the left end portion of FIG. 1 with a part thereof omitted.
- 3 is a cross-sectional view taken along the line AA in FIG.
- FIG. 4 is a side view of the outer column, the outer shaft, and the adjustment rod taken out and viewed from the same direction as FIG.
- FIG. 5 is an enlarged view of the lower left part of FIG.
- FIG. 6A is an enlarged view showing the lower right part of FIG. 5 in a state before the elastic sleeve is elastically deformed
- FIG. 6B is an enlarged view showing the same elastically deformed state (B). is there.
- FIG. 7 is a view similar to FIG.
- FIG. 5 showing a second example of the embodiment of the present invention.
- FIG. 8 is a view similar to FIG. 6 for the second example of the embodiment of the present invention.
- FIG. 9 is a view similar to FIG. 5 showing a third example of the embodiment of the present invention.
- 10 is a cross-sectional view taken along the line BB of FIG.
- FIG. 11 is a view similar to FIG. 6, showing a third example of the embodiment of the present invention.
- FIG. 12 is a diagram showing the influence of the difference in the specifications of the buffer mechanism on the relationship between the amount of displacement of the steering wheel and the resistance to the displacement in the front-rear direction.
- FIG. 13 is a view similar to FIG. 5 showing a fourth example of the embodiment of the present invention.
- FIG. 14 is a diagram similar to FIG.
- FIG. 15A is an end side view of an elastic sleeve, showing a fifth example of the embodiment of the present invention
- FIG. 15B is a cross-sectional view taken along the line CC of FIG. 15A.
- FIG. 16 is a view similar to FIG. 3, showing a sixth example of the embodiment of the present invention.
- FIG. 17 is a view similar to FIG. 3, showing a seventh example of the embodiment of the present invention.
- FIG. 18 is a partially cut schematic side view of a steering device that is conventionally known and includes a telescopic mechanism and a tilt mechanism.
- the telescopic steering device of this example basically includes a steering column 6b, a displacement bracket 22a, an elastic sleeve 35, a steering shaft 5b, a support bracket 12b, an adjustment rod 19a, and expansion / contraction mechanisms 20a and 38.
- the support bracket 12b is supported to the vehicle body side fixing bracket 27 supported and fixed to the vehicle body so that the support bracket 12b can be detached forward by an impact load applied during a secondary collision.
- the peripheral edge portion of the locking notch 28 formed at the center in the width direction of the vehicle body side fixing bracket 27 and having an opening at the front is formed on the upper surface portion 29 of the upper plate portion 29 of the support bracket 12b.
- the holding plate 30 is clamped between the lower surface of the holding plate portion 31 of the holding bracket 30 fixed to the upper surface of the upper plate portion 29 by welding.
- a small passage formed at a portion where the peripheral edge portion of the locking notch 28, the upper plate portion 29 of the support bracket 12b, and the holding plate portion 31 of the holding bracket 30 are aligned with each other.
- a coupling member made of a material that is easy to tear, such as a synthetic resin, is passed over the hole or notch.
- the vehicle body side fixing bracket 27 and the support bracket 12b are coupled so that they do not rattle during normal times and can be detached forward in a secondary collision.
- various conventionally known structures can be employed, and since these structures are well known, the description thereof is omitted.
- the support bracket 12b is obtained by bending a metal plate having sufficient strength and rigidity, such as a steel plate, and is bent at a right angle downward from both the upper plate portion 29 and the left and right end portions of the upper plate portion 29. And a pair of support plate portions 23a. Vertically long holes 24a are formed in portions of the support plate portions 23a that are aligned with each other. These up-and-down direction long holes 24a have a partial arc shape centering on the pivot 11 (refer to FIGS. 18 to 19) which becomes a swing center when the vertical position adjustment of the steering wheel 1 is performed.
- the steering column 6b has a telescopic structure in which a front portion of the outer column 13b and a rear portion of the inner column 14b are fitted so as to be capable of relative displacement in the axial direction.
- the outer column 13b is formed into a cylindrical shape by casting (die casting) a light alloy such as an aluminum alloy.
- an axial slit 32 that is long in the axial direction is formed at the lower end of the front half of the outer column 13b, and the front end of the axial slit 32 is formed into a circumferential slit 33 formed in the lower half of the front end of the outer column 13b.
- the front end portion of the inner column 14b is coupled and fixed to, for example, a housing of a power steering device.
- the housing is supported by the pivot 11 so as to be swingable and displaceable with respect to the vehicle body. The position can be adjusted.
- the present invention can also be implemented by a steering device that does not include a tilt mechanism but includes only a telescopic mechanism.
- the longitudinal hole is formed on the displacement bracket side.
- a simple through hole may be formed in the displacement bracket, and a longitudinally long hole may be formed in a pair of left and right support plate portions constituting the support bracket.
- the adjustment handle also moves back and forth with the adjustment of the front and rear position of the steering wheel.
- the thickness dimension of the support plate portion is small and the width dimension of the inner circumferential surface of the longitudinally long hole formed in the support plate portion is small, it is difficult to attach the elastic sleeve to the longitudinal slot.
- a pair of sandwiched plate portions 34 constituting the displacement bracket 22a are formed at positions near the both ends in the width direction of the lower surface of the outer column 13b so as to sandwich the axial slit 32 from both the left and right sides.
- the sandwiched plate portion 34 is basically a flat plate shape and is cast (fixed) integrally with the outer column 13b. However, at a plurality of locations, weight reduction and shrinkage after casting (caused by molding shrinkage). A recess for preventing dents is formed. Longitudinal direction long holes 25a are formed in parallel with the central axis of the outer column 13b at positions where the sandwiched plate portions 34 are aligned with each other.
- the shape of the front and rear end portions of the front / rear direction long hole 25a viewed from the width direction is a semicircular shape with a constant curvature radius.
- the inner circumferential surface of the front / rear direction long hole 25a has stepped portions at two positions in the middle portion, and the opening area increases from the outer surface side to the inner surface side of the sandwiched plate portion 34. It has a stepped shape that becomes narrower. Since the sandwiched plate portion 34 is made by casting a light alloy together with the main body portion of the outer column 13b, the width dimension and the inner peripheral surface shape of the longitudinal long hole 25a can be adjusted almost arbitrarily. it can. Therefore, the contact area between the inner peripheral surface of the longitudinal long hole 25a and the outer peripheral surface of a pair of elastic sleeves 35 described below can also be adjusted almost arbitrarily.
- the displacement bracket 22a is disposed on the lower side of the steering column 6b, but the displacement bracket may be provided on the upper side of the steering column.
- the steering column can be structured such that the outer column is disposed on the front side and the inner column is disposed on the rear side.
- an elastic sleeve 35 made of an elastomer such as rubber is fitted and supported inside the pair of longitudinal holes 25a.
- the elastic sleeve 35 protrudes over the entire circumference from the main body part fitted in the intermediate part in the penetration direction (left-right direction in FIG. 3) of the longitudinal direction long hole 25a and the outer surface side end part of the sandwiched plate part 34.
- the curvature radius of the central portion of the outer peripheral surface of the front and rear end portions of the elastic sleeve 35 in the free state of the elastic sleeve 35 is set to the semicircular shape of the front and rear end portions of the front and rear direction long hole 25a.
- the radius of curvature of both sides sandwiching the central portion is larger than the radius of curvature of the semicircular shape.
- an arc shape (a crescent moon) as shown in FIGS. 5 to 6 is formed between the inner peripheral surfaces of the front and rear end portions of the longitudinal slot 25a and the outer peripheral surfaces of the front and rear end portions of the elastic sleeve 35, respectively. Shape) is present.
- a concave portion 37 is formed in the central portion of the inner peripheral surface of both the front and rear ends of the elastic sleeve 35, and the thickness of the elastic sleeve 35 is determined at the central portion on both side portions sandwiching the central portion. Smaller than that.
- the steering shaft 5b is rotatably supported inside the steering column 6b.
- the steering shaft 5b is formed by spline engagement between the front half of the rear outer shaft 15b and the rear half of the front inner shaft 16b, and enables torque transmission and expansion / contraction.
- the outer shaft 15b is rotatably supported on the inner side of the outer column 13b while preventing axial displacement of the outer column 13b.
- the steering wheel 1 (see FIG. 18) can be fixed to a portion protruding from the rear end opening of the outer column 13b at the rear end portion of the outer shaft 5b.
- the adjustment rod 19a is inserted into the inside of the vertical sleeve 24a and the elastic sleeve 35 attached to the inside of the longitudinal slot 25a.
- the expansion / contraction mechanism incorporating the adjustment rod 19a the space
- a vertical slot 25a is formed in which the head 38 provided at the base end portion (right end portion in FIG. 3) of the adjustment rod 19a is formed in one support plate portion 23a (right side in FIG. 3).
- the adjustment handle 18a When adjusting the vertical position or the front-back position of the steering wheel 1, the adjustment handle 18a is rotated downward to reduce the axial dimension of the cam device 20a. As a result, the distance between the head 38 and the driven cam 42 is increased, and the force with which the support plate portion 23a holds the pair of left and right sandwiched plate portions 34 constituting the displacement bracket 22a is reduced or lost. . At the same time, the inner diameter of the front half of the outer column 13b is elastically expanded, and the surface pressure of the fitting portion between the inner circumferential surface of the front half of the outer column 13b and the outer circumferential surface of the rear half of the inner column 14b is reduced or lost.
- the vertical position of the steering wheel 1 can be adjusted within a range in which the adjustment rod 19a can be displaced in the vertical elongated hole 24a. Further, the front-rear position of the steering wheel 1 can be adjusted within a range in which the adjustment rod 19a can be displaced inside the elastic sleeve 35a.
- the adjustment handle 18a is rotated upward to expand the axial dimension of the cam device 20a, thereby reducing the distance between the head 38 and the driven cam 42.
- the support plate portion 23a strongly suppresses the pair of left and right sandwiched plate portions 34 constituting the displacement bracket 22a.
- the inner diameter of the front half of the outer column 13b is reduced, and the fitting strength between the front half of the outer column 13b and the rear half of the inner column 14b is increased.
- the steering wheel 1 can be held at the adjusted position.
- the thickness of the portion of the elastic sleeve 35 where the adjusting rod 19a hits is also elastically compressed. Together, these two buffering effects absorb a substantial portion of the impact energy applied from the adjustment rod 19a to the end of the elastic sleeve 35.
- the support bracket 12b can be prevented from moving forward. That is, when the driver pushes and moves the outer column 13b forward through the steering wheel 1 and the outer shaft 15b in a state where the adjustment handle 18a is rotated downward, the adjustment rod 19a is moved in the longitudinal direction long hole 25a. Displaced vigorously toward the rear end of the. The kinetic energy that moves the outer column 13b forward is transmitted to the support bracket 12b through the adjustment rod 19a.
- the synthetic resin coupling member that couples the support bracket 12b and the vehicle body side fixing portion racket 27 is torn, and the support bracket 12b is detached forward.
- a considerable portion of the impact energy transmitted from the outer column 13b to the adjusting rod 19a can be absorbed based on the elastic deformation of the elastic sleeve 35, a physique driver can perform a rough operation. With the impact that has been performed, the support bracket 12b is prevented from moving forward.
- the impact energy transmitted to the adjusting rod 19a at the time of the secondary collision is much larger than the impact energy applied by such a violent operation, so that the driver who has collided with the steering wheel 1 by detaching the support bracket 12b forward. Alleviates the impact on the body. Also in this case, shock absorption based on elastic deformation of the elastic sleeve 35 is useful for driver protection.
- the adjustment rod 19a is directly below the upper plate portion 29 constituting the support bracket 12b.
- Such a structure is advantageous in terms of ensuring the support rigidity of the outer column 13b with respect to the support bracket 12b, but the rigidity in the width direction of the support plate part 23a at the installation portion of the adjustment rod 19a is increased.
- the resistance to the reduction of the distance between the head 38 and the driven cam 42 by the adjustment handle 18a is likely to increase, which is somewhat disadvantageous from the viewpoint of increasing the force for holding the outer column 13b by the support plate portion 23a.
- the adjustment rod 19a easily moves to the rear end portion of the elastic sleeve 35 before the support bracket 12b is detached forward. Even in such a case, the impact energy is absorbed based on the elastic deformation of the rear end portion of the elastic sleeve 35, which is advantageous from the viewpoint of driver protection.
- the pushing force is larger than the pulling force, and when the front / rear position of the steering wheel 1 is adjusted, the direction in which the steering wheel 1 is moved vigorously is often forward. Further, there is a possibility that the support bracket 12b is detached forward when the steering wheel 1 is vigorously displaced forward. Therefore, in the state where the steering wheel 1 is moved to the adjustable rear end position, it is not always necessary to provide a buffer function. However, if this cushioning function is provided in both the front and rear directions, it is not necessary to regulate the direction of assembly of the elastic sleeve 35, and in addition to eliminating the possibility of erroneous assembly, also when adjusting to the rear end position. This is advantageous in terms of realizing a structure that does not give the driver a sense of incongruity.
- FIG. 7 to 8 show a second example of the embodiment of the present invention.
- the shape of the front and rear ends of the elastic sleeve 35a for interposing the gap 36a for absorbing shock is different from that of the first example of the embodiment.
- the shape of the inner peripheral surface of the end portion of the longitudinal long hole 25a is a semicircular shape with a constant radius of curvature, and the shape of the front and rear end portions of the elastic sleeve 35a. Is composed of a central flat plate portion 43 and curved plate portions on both sides sandwiching the flat plate portion 43.
- the clearance gap 36a exists between the edge part inner peripheral surface of the front-back direction long hole 25a and the both end part outer peripheral surface of the elastic sleeve 35a.
- FIG. 9 to 12 show a third example of the embodiment of the present invention.
- the front shock absorbers provided at the front and rear end portions of the elastic sleeve 35b are respectively substantially semi-cylindrical.
- the buffer performances of the portion 44 and the rear buffer portion 45 are different from each other. Specifically, the buffering performance of the rear shock absorber 45 facing the adjusting rod 19a in a state where the steering wheel 1 (see FIG. 19) is moved to the foremost position where the steering wheel 1 can be adjusted.
- the thickness dimension T in the front-rear direction of the rear buffer part 45 among the buffer parts 44, 45 existing at both front and rear ends of the elastic sleeve 35b is larger than the thickness dimension t in the front-rear direction of the front buffer part 44 It is large (T> t).
- the support bracket 12b can be separated forward. I try to prevent it.
- the front buffer portion 44 that operates when moving in a direction in which such separation is unlikely to occur, a range in which an uncomfortable feeling given to the driver when adjusting the front-rear position of the steering wheel 1 can be suppressed. Therefore, the thickness dimension t is kept small. Therefore, in order to realize a structure that can prevent the driver from feeling uncomfortable or uncomfortable even when the position of the steering wheel 1 is adjusted in any direction, the front side is provided at the front and rear ends of the longitudinal direction long hole 25a. Despite the structure in which the buffer portion 44 and the rear buffer portion 45 are provided, the longitudinal dimension of the sandwiched plate portion 34 of the displacement bracket 22a provided with the longitudinal slot 25a may become unnecessarily large. Is prevented.
- FIG. 12 shows a characteristic in which the front buffer portion 44 and the rear buffer portion 45 absorb the impact applied from the adjustment rod 19a.
- the horizontal axis indicates the displacement amount of the adjustment rod 19a
- the vertical axis indicates the displacement of the adjustment rod 19a.
- the values of the resistance to doing are shown respectively.
- the broken line ⁇ in FIG. 12 indicates the energy absorption characteristic by the rear buffer part 45
- the chain line ⁇ indicates the energy absorption characteristic by the front buffer part 44.
- the relatively gentle portion starting from the origin (zero point) is elastically deformed by the front buffering portion 44 and the rear buffering portion 45 while the gap 36 is eliminated, whereby the adjusting rod 19a.
- the slopes of the lines ⁇ , ⁇ , and ⁇ shown in FIG. 12 are schematic, and do not represent the buffering performance of each structure by an actual ratio.
- the actual ratio can be arbitrarily adjusted by the material (elastic coefficient) constituting the elastic sleeve 35b, the thickness dimensions t and T of the front and rear buffer portions 44 and 45, the dimension of the gap 36, and the like.
- the chain line ⁇ is generally leftward from the state of FIG. 12, or conversely, the broken line ⁇ is generally rightward from the state of FIG. become.
- the concave portion 37 and the gap 36 can be omitted with respect to the front buffer portion 44.
- the right half of the chain line ⁇ has such a characteristic that the portion with a relatively steep slope starts from the origin as it is.
- the structure and operation of other parts in this example are the same as those in the first example of the embodiment.
- [Fourth Example of Embodiment] 13 to 14 show a fourth example of the embodiment of the present invention.
- the shapes of the front buffer portion 44a and the rear buffer portion 45a provided at both front and rear end portions of the elastic sleeve 35c in order to interpose the gap 36a for absorbing shock are the same as the third embodiment. It is different from the example.
- the shape of the inner circumferential surface of the end portion of the longitudinal long hole 25a is a semicircular shape with a constant radius of curvature, and the shape of the front and rear end portions of the elastic sleeve 35c.
- FIG. 15 shows a fifth example of the embodiment of the present invention.
- the shape of the outer peripheral surface of both ends in the front-rear direction of the elastic sleeve 35d is half that matches the shape of the inner peripheral surface of the end of the long hole 25a in the front-rear direction (see FIGS. 13 to 14). It is circular and has a shape that is recessed forward from both ends in the width direction with respect to the center portion in the width direction. And in this width direction center part, the clearance gap exists between the edge part outer peripheral surface of the elastic sleeve 35d, and the edge part internal peripheral surface of the front-back direction long hole 25a.
- the rigidity of the front buffer portion 44a and the rear buffer portion 45a can be slightly increased as compared with the second or fourth example of the embodiment, and the gap
- the configuration and operation of other parts of this example are the same as those of the second and fourth examples of the embodiment. It should be noted that the formation of the gap at the central portion in the width direction can also be applied to the structures of the first example and the third example of the embodiment.
- FIG. 16 shows a sixth example of the embodiment of the present invention.
- a single elastic is provided in a pair of longitudinal holes 25a formed integrally with the outer column 13b and formed in a pair of left and right sandwiched plate portions 34a constituting the displacement bracket 22b. Both ends of the sleeve 35e in the width direction are fitted inside.
- the elastic sleeve 35e is mounted in a state of being stretched between the pair of sandwiched plate portions 34a.
- the support bracket 12c is supported to the portion fixed to the vehicle body through a pair of right and left locking capsules 46 so that the support bracket 12c can be detached forward by impact energy applied during a secondary collision. is doing.
- Such a detachment mechanism using the locking capsule 46 is well known in the art and will not be described.
- the configuration and operation of other parts of this example are the same as those of the first example of the embodiment.
- FIG. 17 shows a seventh example of the embodiment of the invention.
- the directional slit 32a is welded and fixed in a state where it is sandwiched from both the left and right sides. Then, both ends in the width direction of a single elastic sleeve 35f are fitted into the longitudinal long holes 25b formed in the matching portions of the pair of sandwiched plate portions 34b, respectively, and the resilient sleeve 35f is sandwiched.
- a shock absorbing member made of an elastic material is attached to the inside of the front and rear end portions of the front and rear direction long hole, respectively, and the outer peripheral surface of the adjustment rod and the end portion of the front and rear direction long hole are inside. It is also possible to provide a buffering mechanism that prevents direct collision with the peripheral surface and absorbs collision energy by elastically deforming the buffering member. Furthermore, the buffering performance of the buffer mechanism provided at the end on the side where the adjustment rod is located when the entire length of the steering column is contracted to the end on the side where the adjustment rod is located when the entire length of the steering column is extended to the maximum. It can also be made higher than the buffering performance of the buffer mechanism provided in the.
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Abstract
Description
図1~図6は、本発明の実施の形態の第1例を示している。本例のテレスコピックステアリング装置は、基本的に、ステアリングコラム6bと、変位ブラケット22aと、弾性スリーブ35と、ステアリングシャフト5bと、支持ブラケット12bと、調節ロッド19aと、拡縮機構20a、38とを備える。本例のテレスコピックステアリング装置では、車体に対し支持固定される車体側固定ブラケット27に対して支持ブラケット12bを、二次衝突時に加わる衝撃荷重により、前方への離脱を可能に支持している。このために、車体側固定ブラケット27の幅方向中央部に形成した、前方が開口した係止切り欠き28の周縁部を、支持ブラケット12bの上板部29の上面の幅方向両端寄り部分と、上板部29の上面に溶接固定した抑えブラケット30の抑え板部31の下面との間で挟持している。そして、車体側固定ブラケット27のうちで係止切り欠き28の周縁部と、支持ブラケット12bの上板部29と、抑えブラケット30の抑え板部31との互いに整合する部分に形成した、小通孔または切り欠きに、合成樹脂などの裂断しやすい材料製の結合部材を掛け渡している。この構成により車体側固定ブラケット27と支持ブラケット12bとを、通常時にがたつくことがなく、かつ、二次衝突時には支持ブラケット12bの前方への離脱を可能に結合している。なお、この部分に関しては、従来から知られている各種構造を採用することができ、これらの構造は周知であるため、その説明は省略する。
図7~図8は、本発明の実施の形態の第2例を示している。本例の場合には、衝撃吸収のための隙間36aを介在させるための、弾性スリーブ35aの前後両端部の形状を、実施の形態の第1例と異ならせている。具体的には、前後方向長孔25aの端部内周面の形状を、実施の形態の第1例の場合と同様に、曲率半径が一定の半円形とし、弾性スリーブ35aの前後両端部の形状を、中央部の平板部43と、この平板部43を挟む両側部分の曲板部とからなるものとしている。そして、平板部43に対応する部分で、前後方向長孔25aの端部内周面と弾性スリーブ35aの両端部外周面との間に、隙間36aを存在させている。本例のその他の部分の構成および作用は、実施の形態の第1例と同様である。
図9~図12は、本発明の実施の形態の第3例を示している。本例の場合、弾性スリーブ35bの厚さ寸法を、前端部と後端部とで互いに異ならせることにより、弾性スリーブ35bの前後両端部に設けた、それぞれが略半円筒状である、前側緩衝部44と後側緩衝部45との緩衝性能を、互いに異ならせている。具体的には、ステアリングホイール1(図19参照)を調節可能な最前位置に移動させた状態で調節ロッド19aが対向する、後側緩衝部45の緩衝性能を、ステアリングホイール1を調節可能な最後位置に移動させた状態で調節ロッド19aが対向する、前側緩衝部44の緩衝性能よりも高くしている。このため、弾性スリーブ35bの前後両端部に存在する緩衝部44、45のうち、後側緩衝部45の前後方向に関する厚さ寸法Tを、前側緩衝部44の前後方向の厚さ寸法tよりも大きく(T>t)している。
図13~図14は、本発明の実施の形態の第4例を示している。本例の場合には、衝撃吸収のための隙間36aを介在させるため、弾性スリーブ35cの前後両端部に設けた、前側緩衝部44aおよび後側緩衝部45aの形状を、実施の形態の第3例と異ならせている。具体的には、前後方向長孔25aの端部内周面の形状を、実施の形態の第2例の場合と同様に、曲率半径が一定の半円形とし、弾性スリーブ35cの前後両端部の形状を、中央部の平板部43a、43bと、平板部43a、43bを挟む両側部分の曲板部とからなるものとしている。そして、平板部43a、43bに対応する部分で、前後方向長孔25aの両端部内周面と弾性スリーブ35cの両端部外周面との間に、隙間36aを存在させている。本例のその他の部分の構成および作用は、実施の形態の第3例と同様である。
図15は、本発明の実施の形態の第5例を示している。本例の構造では、弾性スリーブ35dの前後方向両端部の外周面の形状を、幅方向両端部に関して、前後方向長孔25a(図13~図14参照)の端部内周面の形状に見合う半円形とし、幅方向中央部に関して、幅方向両端部よりも前方に凹んだ形状としている。そして、この幅方向中央部で、弾性スリーブ35dの端部外周面と前後方向長孔25aの端部内周面との間に隙間を存在させている。本例の構造により、実施の形態の第2例または第4例の場合よりも、前側緩衝部44aおよび後側緩衝部45a(図13参照)の剛性を少し高くすることができるとともに、隙間の幅方向寸法の変更などにより、調節ロッド19aを前後方向長孔25aの前後両端部に勢いよく変位させた状態での衝撃吸収性能を変えることが可能となる。本例のその他の部分の構成および作用は、実施の形態の第2例および第4例と同様である。なお、この幅方向中央部に隙間を構成することは、実施の形態の第1例および第3例の構造に適用することも可能である。
図16は、本発明の実施の形態の第6例を示している。本例の場合には、アウタコラム13bと一体に設けた、変位ブラケット22bを構成する左右1対の被挟持板部34aにそれぞれ形成された1対の前後方向長孔25aに、単一の弾性スリーブ35eの幅方向両端部をそれぞれ内嵌している。要するに、弾性スリーブ35eを、1対の被挟持板部34a同士の間に掛け渡される状態で装着している。また、本例の場合には、支持ブラケット12cを車体に固定の部分に対し、左右1対の係止カプセル46を介して、二次衝突時に加わる衝撃エネルギにより、前方への離脱を可能に支持している。このような、係止カプセル46を利用した離脱機構については、従来から周知であるため、その説明は省略する。本例のその他の部分の構成および作用は、実施の形態の第1例と同様である。
図17は、本発明の実施の形態の第7例を示している。本例の場合には、鋼板製の(電縫管または引き抜き管である)アウタコラム13dの下面に、変位ブラケット22cを構成する1対の被挟持板部34bを、アウタコラム13cに形成した軸方向スリット32aを左右両側から挟む状態で、溶接固定している。そして、1対の被挟持板部34bの互いに整合する部分に形成した前後方向長孔25bに、単一の弾性スリーブ35fの幅方向両端部をそれぞれ内嵌して、弾性スリーブ35fを、被挟持板部34b同士の間に掛け渡している。ただし、本例の場合には、被挟持板部34bの板厚による制約があるため、前後方向長孔25bの内周面と、弾性スリーブ35fの外周面との接触面積を任意には調節しにくい。本例のその他の部分の構成および作用は、実施の形態の第6例と同様である。
2 ステアリングギヤユニット
3 入力軸
4 タイロッド
5、5a、5b ステアリングシャフト
6、6a、6b ステアリングコラム
7 自在継手
8 中間シャフト
9 自在継手
10 車体
11 枢軸
12、12a、12b、12c 支持ブラケット
13、13a~13d アウタコラム
14、14a、14b インナコラム
15、15a、15b アウタシャフト
16、16a、16b インナシャフト
17 電動モータ
18、18a 調節ハンドル
19、19a 調節ロッド
20、20a カム装置
21 カム部材
22、22a、22b、22c 変位ブラケット
23、23a 支持板部
24、24a 上下方向長孔
25、25a、25b 前後方向長孔
26a、26b スリーブ
27 車体側固定ブラケット
28 係止切り欠き
29 上板部
30 抑えブラケット
31 抑え板部
32、32a 軸方向スリット
33 周方向スリット
34、34a、34b 被挟持板部
35、35a~35f 弾性スリーブ
36、36a 隙間
37 凹部
38 頭部
39 ナット
40 スラスト軸受
41 駆動側カム
42 被駆動側カム
43、43a、43b 平板部
44、44a 前側緩衝部
45、45a 後側緩衝部
46 係止カプセル
Claims (8)
- 筒状で、少なくとも軸方向一端部の内径を拡縮可能としたアウタコラムと、このアウタコラムの内径側に軸方向の変位を可能に嵌合支持されたインナコラムとを組み合わせて、伸縮可能となっている、ステアリングコラムと、
前記アウタコラムと前記インナコラムとのうちの後側に位置する一方に固設され、ステアリングホイールの前後移動に伴って、この一方のコラムとともにその軸方向に変位するもので、この一方のコラムの軸方向に長い、前後方向長孔を備えている、変位ブラケットと、
前記前後方向長孔の内側に装着される、弾性スリーブと、
前記ステアリングコラムの内径側に回転自在に支持されて、前記ステアリングコラムの後端開口よりも後方に突出した部分に、前記ステアリングホイールが固定される、ステアリングシャフトと、
前記ステアリングホイールの前後位置を調節可能に、前記ステアリングコラムを車体に対して支持するもので、前記変位ブラケットを幅方向両側から挟む1対の支持板部と、これらの支持板部の互いに整合する部分に形成された1対の通孔とを備える、支持ブラケットと、
前記通孔、および、前記前後方向長孔の内側に装着された前記弾性スリーブの内側を、前記変位ブラケットの幅方向に挿通する調節ロッドと、
前記調節ロッドの両端部で前記支持板部の外側面に対向する部分に設けた1対の押圧部同士の間隔を拡縮することにより、これらの支持板部の内側面同士の間隔を拡縮する、拡縮機構と、
を備える、ステアリングコラム装置。 - 前記前後方向長孔の前後両端部および前記弾性スリーブの前後両端部のうち、少なくとも前記ステアリングホイールの前後位置を調節可能な最前位置にするため、前記ステアリングコラムの全長を縮めた状態で、前記調節ロッドが位置する側の片端部で、前記前後方向長孔の内周面と前記弾性スリーブの外周面との間に、前記調節ロッドが、前記弾性スリーブの前記片端部の内周面に勢いよく衝突した際に、この弾性スリーブの前記片端部の弾性変形量を多くして、前記前後方向長孔の前記片端部の内周面から前記調節ロッドに加わる衝撃を緩和する機能を果たす隙間が設けられている、請求項1に記載のテレスコピックステアリング装置。
- 前記アウタコラムが後側に、前記インナコラムが前側に、それぞれ配置されており、前記一方のコラムが前記アウタコラムであって、このアウタコラムの前端部に軸方向に長いスリットが形成されていて、このアウタコラムの内径が弾性的に拡縮可能となっており、前記変位ブラケットが、前記スリットを両側から挟む状態で、このアウタコラムの外周面に固設された1対の被挟持板部からなり、前記前後方向長孔がこれらの被挟持板部に形成されており、前記片端部が後端部であって、少なくとも前記前後方向長孔の後端部の内周面と前記弾性スリーブの後端部の外周面との間に、前記隙間が設けられている、請求項2に記載したテレスコピックステアリング装置。
- 前記前後方向長孔の前記片端部の内周面の形状が、曲率半径が一定の半円形であり、前記弾性スリーブの前記片端部の外周面の形状が、中央部の曲率半径がこの半円形の曲率半径よりも小さく、この中央部を挟む両側部分の曲率半径がこの半円形の曲率半径よりも大きな山形であり、この両側部分で、前記前後方向長孔の前記片端部の内周面と前記弾性スリーブの前記片端部の外周面との間に、前記隙間が存在する、請求項2に記載のテレスコピックステアリング装置。
- 前記前後方向長孔の前記片端部の内周面の形状が、曲率半径が一定の半円形であり、前記弾性スリーブの前記片端部の形状が、中央部の平板部とこの平板部を挟む両側部分の曲板部とからなるものであり、この平板部に対応する部分で、前記前後方向長孔の前記片端部の内周面と前記弾性スリーブの前記片端部の外周面との間に、前記隙間が存在する、請求項2に記載のテレスコピックステアリング装置。
- 前記前後方向長孔の前後両端部と前記弾性スリーブの前後両端部で、これら前後方向長孔の内周面と弾性スリーブの外周面との間に、前記隙間が設けられている、請求項2に記載のテレスコピックステアリング装置。
- 前記弾性スリーブの前後両端部のうち、前記ステアリングホイールの前後位置を調節可能な最前位置にするため、前記ステアリングコラムの全長を最も縮めた状態で、前記調節ロッドが位置する側である片端部の緩衝性能を、前記ステアリングコラムを最も伸ばした状態で、前記調節ロッドが位置する側である他端部の緩衝性能よりも高くしている、請求項1に記載のテレスコピックステアリング装置。
- 前記弾性スリーブの前後両端部のうち、前記片端部の前後方向に関する厚さ寸法が、前記他端部の前後方向に関する厚さ寸法よりも大きい、請求項7に記載のテレスコピックステアリング装置。
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- 2012-08-27 US US14/347,639 patent/US9114828B2/en active Active
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Also Published As
Publication number | Publication date |
---|---|
EP2765057B1 (en) | 2017-05-17 |
US9114828B2 (en) | 2015-08-25 |
CN103153753B (zh) | 2016-02-17 |
EP2765057A1 (en) | 2014-08-13 |
US20140331811A1 (en) | 2014-11-13 |
CN103153753A (zh) | 2013-06-12 |
EP2765057A4 (en) | 2015-06-03 |
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