WO2015136951A1 - トルク伝達ユニット - Google Patents
トルク伝達ユニット Download PDFInfo
- Publication number
- WO2015136951A1 WO2015136951A1 PCT/JP2015/050534 JP2015050534W WO2015136951A1 WO 2015136951 A1 WO2015136951 A1 WO 2015136951A1 JP 2015050534 W JP2015050534 W JP 2015050534W WO 2015136951 A1 WO2015136951 A1 WO 2015136951A1
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- WIPO (PCT)
- Prior art keywords
- diameter side
- connecting pin
- hole
- torque transmission
- yoke
- Prior art date
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Classifications
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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
- F16D3/16—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts
- F16D3/26—Hooke's joints or other joints with an equivalent intermediate member to which each coupling part is pivotally or slidably connected
- F16D3/38—Hooke's joints or other joints with an equivalent intermediate member to which each coupling part is pivotally or slidably connected with a single intermediate member with trunnions or bearings arranged on two axes perpendicular to one another
- F16D3/382—Hooke's joints or other joints with an equivalent intermediate member to which each coupling part is pivotally or slidably connected with a single intermediate member with trunnions or bearings arranged on two axes perpendicular to one another constructional details of other than the intermediate member
- F16D3/387—Fork construction; Mounting of fork on shaft; Adapting shaft for mounting of fork
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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
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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
- B62D1/20—Connecting steering column to steering gear
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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
- F16D1/00—Couplings for rigidly connecting two coaxial shafts or other movable machine elements
- F16D1/06—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end
- F16D1/08—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end with clamping hub; with hub and longitudinal key
- F16D1/0852—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end with clamping hub; with hub and longitudinal key with radial clamping between the mating surfaces of the hub and shaft
- F16D1/0864—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end with clamping hub; with hub and longitudinal key with radial clamping between the mating surfaces of the hub and shaft due to tangential loading of the hub, e.g. a split hub
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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
- F16D1/00—Couplings for rigidly connecting two coaxial shafts or other movable machine elements
- F16D1/06—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end
- F16D1/08—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end with clamping hub; with hub and longitudinal key
- F16D1/0894—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end with clamping hub; with hub and longitudinal key with other than axial keys, e.g. diametral pins, cotter pins and no other radial clamping
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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
- F16D1/00—Couplings for rigidly connecting two coaxial shafts or other movable machine elements
- F16D1/10—Quick-acting couplings in which the parts are connected by simply bringing them together axially
- F16D2001/103—Quick-acting couplings in which the parts are connected by simply bringing them together axially the torque is transmitted via splined connections
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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
- F16D3/10—Couplings with means for varying the angular relationship of two coaxial shafts during motion
Definitions
- the present invention comprises a torque transmission shaft and a torsion bar, which are used by being incorporated in an electric or hydraulic power steering device and connected to each other by a connecting pin, and a universal joint yoke.
- the present invention relates to a torque transmission unit.
- FIGS. 19 to 20 show an example of an electric power steering apparatus which has been conventionally described in Patent Document 1 and the like.
- a steering shaft 2 having a steering wheel 1 fixed to a rear end portion is rotatably supported inside a cylindrical steering column 3.
- the movement of the steering wheel 1 is transmitted to the input shaft 8 of the steering gear unit 7 via the steering shaft 2, the electric assist device 4, the universal joint 5a, the intermediate shaft 6, and another universal joint 5b.
- the pair of tie rods 9, 9 arranged on both sides of the steering gear unit 7 are pushed and pulled, and the steering angle corresponding to the operation amount of the steering wheel 1 is set to the pair of left and right steering wheels.
- the front-rear direction depends on the traveling direction of the automobile, and the left side of each figure except FIGS. 2, 6, 11, and 16 to 18 is the “front side”, and the right side is the “rear side”. It becomes.
- the electric assist device 4 includes an electric motor 10 that is an auxiliary power source, a metal housing 11 that supports the electric motor 10, and torque transmission that is disposed inside the housing 11.
- An output shaft 12, which is a shaft, a torsion bar 13, a torque detector 14, and a worm type speed reducer 15 are provided.
- the housing 11 includes a front lid 16 and a rear main body 17 coupled to each other by a plurality of bolts 18 and 18, and is coupled and fixed to the front end of the steering column 3. A front end portion of the steering shaft 2 is inserted inside the housing 11.
- the output shaft 12 is made of steel in a hollow shape, and is rotatably supported by a pair of ball bearings 19 and 20 on the front side of the steering shaft 2 in the housing 11.
- a universal joint 5 a (see FIG. 19) is coupled to the front end portion of the output shaft 12 protruding from the front end opening of the housing 11.
- the torsion bar 13 is made of steel such as spring steel and is inserted through the inner diameter side of the output shaft 12. In this state, the rear end portion of the torsion bar 13 is press-fitted into a connecting hole portion 21 provided on the inner diameter side of the steering shaft 2 so as to be connected to the steering shaft 2 so that torque can be transmitted.
- the front end portion of the torsion bar 13 is connected to the output shaft 12 by the connecting pin 22 so as to transmit torque while being fitted in the front end portion of the output shaft 12.
- outer diameter side through holes 23 and 23 are arranged at two positions on the opposite side in the radial direction of the front end portion of the output shaft 12, and inner diameter side through holes 24 are concentric with each other at the front end portion of the torsion bar 13. It is formed in the radial direction.
- the connecting pin 22 is press-fitted inside the outer diameter side and inner diameter side through holes 23 and 24 in a state of being spanned between the outer diameter side and inner diameter side through holes 23 and 24.
- the torque detector 14 is provided at the front end portion of the steering shaft 2 in a state of being arranged around the torque detection uneven portion 25 provided near the rear end portion of the outer peripheral surface of the output shaft 12 and the torque detection uneven portion 25.
- a torque detection sleeve 26 supported and fixed, and a torque detection coil unit 27 supported and fixed to the housing 11 in a state of being arranged around the torque detection sleeve 26 are provided.
- the worm type reduction gear 15 is formed by combining a worm wheel 28 and a worm (not shown).
- the worm wheel 28 is externally fitted and fixed to a substantially central portion in the axial direction, which is a portion between the ball bearings 19 and 20 of the output shaft 12.
- the worm is rotatably supported in the housing 11 in a state where the worm is engaged with the worm wheel 28.
- the base end portion of the worm is coupled to the output shaft of the electric motor 10 so that torque can be transmitted.
- the torsion bar 13 corresponds to the direction and magnitude of the torque. Elastically twisted.
- a change in the circumferential positional relationship between the torque detecting uneven portion 25 and the torque detecting sleeve 26 causes a change in impedance in the coils constituting the torque detecting coil unit 27.
- the electric motor 10 generates auxiliary power corresponding to the direction and magnitude of this torque.
- the auxiliary power is increased by the worm speed reducer 15 and then applied to the output shaft 12. As a result, the force required for the driver to operate the steering wheel 1 is reduced.
- one yoke 29 of a pair of yokes 29, 30 constituting the universal joint 5a is provided at the front end portion of the output shaft 12, for example, as shown in FIG. 21, one yoke 29 of a pair of yokes 29, 30 constituting the universal joint 5a is provided.
- a partially cutout cylindrical base 31 is fitted and fixed.
- one end portion of the connecting pin 22 is a discontinuous portion (slit) 33 formed in the base portion 31 of the yoke 29. May come to a position within the range.
- the connecting pin 22 is axially connected to the output shaft 12a by the repeated use of the torque transmission unit.
- both end portions of the connecting pin 22 are hidden on the inner diameter side of the base portion 31.
- the connecting pin 22 is provided inside each of the through holes 23 and 24 on the outer diameter side and inner diameter side. Whether it is installed or not cannot be confirmed visually from the outside of the yoke 29 (or photographed with a camera and confirmed by image diagnosis). That is, whether or not the connecting pin 22 is installed can be confirmed only at a stage before the yoke 29 is coupled and fixed to the front end portion of the output shaft 12, and there is room for improvement.
- the present invention has been made in view of the circumstances as described above, and an object of the present invention is to reliably regulate axial displacement of a connecting pin that connects one end of a torque transmission shaft and one end of a torsion bar.
- the object is to provide a torque transmission unit capable of
- the torque transmission unit of the present invention is A torque transmission shaft that is hollow and has outer through holes formed concentrically and radially at two positions on the opposite side in the radial direction at one end;
- a torsion bar which is inserted into the inner diameter side of the torque transmission shaft and has an inner diameter side through hole formed in a radial direction at a position aligned with the outer diameter side through hole at one end;
- a connecting pin inserted into the outer diameter side through hole and the inner diameter side through hole in a state of being spanned between the outer diameter side through hole and the inner diameter side through hole,
- a partially cut cylindrical base portion having a discontinuous portion at one circumferential direction, wherein the base portion includes a pair of flange portions formed at positions sandwiching the discontinuous portion, and the pair of flange portions;
- a yoke having a pair of mounting holes formed at positions aligned with each other; In a state where the base of the yoke is externally fitted to one end of the torque transmission shaft, the base is
- the insertion of the connecting pin into the outer diameter side through hole and the inner diameter side through hole may be press-fitting that gives the fitting surface a tightening margin, or simply does not give the fitting surface a tightening margin. It may be an insertion.
- the insertion or screwing of the bolt into the mounting hole specifically means that a pair of mounting holes is inserted into the through hole and further tightened against a nut screwed into the tip.
- one through hole may be used as a through hole, inserted through the through hole, screwed into a screw hole that is the other attachment hole, and further tightened.
- the torque transmission unit includes the outer diameter side through hole and the inner diameter side based on engagement between both end portions of the connecting pin and a displacement restricting portion which is a part of the yoke or the bolt.
- At least one of the both end portions of the connecting pin is present at a position where it can be seen from the outside of the yoke (capable of photographing with a camera). May be.
- the displacement restricting portion with respect to the one end portion of the connection pin is an inner peripheral surface of the base portion or a flange portion of the bolt.
- the displacement restricting portion with respect to the end portion is an inner peripheral surface of the base portion; Based on the engagement between both end portions of the connecting pin and the both displacement restricting portions, the outer diameter side through hole and the axial displacement of the connecting pin with respect to the inner diameter side through hole are restricted, whereby the outer The state where the connecting pin is spanned between the diameter side through hole and the inner diameter side through hole may be maintained.
- the width dimension of the discontinuous part of the base part may be made smaller than the diameter dimension of the connecting pin.
- one end of the connecting pin may be present at a position that can be seen from the outside of the yoke through the discontinuous portion.
- At least one of the outer diameter side through hole and the inner diameter side through hole is based on the engagement between both ends of the connecting pin and the pair of displacement restricting portions. It is possible to maintain the state where the connecting pin is stretched between the two. Therefore, regardless of repeated use, it is possible to maintain a state in which one end portion of the torque transmission shaft and one end portion of the torsion bar are connected by the connecting pin so as to be able to transmit torque.
- FIG. 1 The top view which shows the coupling
- II-II sectional drawing of FIG. The top view of the front-end part of an output shaft.
- VI-VI sectional drawing of FIG. The figure similar to FIG. 1 which shows 3rd Embodiment of this invention.
- FIGS. 4A to 4C are plan views showing three examples of a front end portion of a torque transmission shaft that can be employed when implementing the present invention.
- FIGS. 6A to 6C are plan views showing other three examples of the front end portion of the torque transmission shaft that can be employed when the present invention is implemented.
- FIGS. FIGS. 4A to 4C are plan views showing three examples of a front end portion of a torque transmission shaft that can be employed when the present invention.
- FIGS. FIGS. 6A to 6C are plan views showing other three examples of the front end portion of the torque transmission shaft that can be employed when the present invention is implemented.
- FIGS. 4A to 4D are cross-sectional views showing four examples of the structure of a connecting portion between an output shaft using a connecting pin and a torsion bar, which can be employed when implementing the present invention.
- the partially cut side view which shows an example of the electric power steering apparatus conventionally known.
- XX-XX sectional drawing of FIG. The top view which shows the coupling
- the top view which shows the other connection part of the front-end part of the output shaft of a motor-assisted device, and the yoke of a universal joint regarding the conventional structure.
- a first embodiment of the present invention will be described with reference to FIGS.
- a feature of the present embodiment is a connecting portion between the front end portion of the output shaft 12a that is a torque transmission shaft and one yoke 29a that constitutes the universal joint 5a, which constitutes the electric assist device. Since the structure and operation of the other parts are the same as those of the conventional structure shown in FIGS. 19 to 20, overlapping illustrations and explanations are omitted or simplified as much as possible. The explanation will focus on the parts that were not explained in.
- the output shaft 12a is made of steel in a hollow shape as in the case of the conventional structure described above, and a steel torsion bar 13 such as spring steel is inserted through the inner diameter side thereof. ing.
- the torsion bar 13 is connected to the output shaft 12a by the connecting pin 22 so that torque can be transmitted, with the front end of the torsion bar 13 being fitted inside the front end of the output shaft 12a.
- the outer diameter side through holes 23 and 23 are located at two positions opposite to the radial direction of the front end portion of the output shaft 12a, and the inner diameter side through hole 24 is concentric with the front end portion of the torsion bar 13. It is formed in the radial direction.
- the connecting pin 22 is press-fitted inside the outer diameter side and inner diameter side through holes 23 and 24 in a state where the connecting pin 22 is passed between the outer diameter side and inner diameter side through holes 23 and 24. .
- one yoke 29a of the pair of yokes 29a and 30 constituting the universal joint 5a is coupled and fixed to the front end portion of the output shaft 12a so as to transmit torque.
- One yoke 29a is made of metal, and includes a base portion 31a and a pair of arm portions 32 and 32 extending from the axial front end portion of the base portion 31a.
- the base 31a is formed in a partially cut cylindrical shape by providing a discontinuous portion (slit) 33 at one place in the circumferential direction, so that the inner diameter can be enlarged or reduced.
- the base portion 31 a forms a pair of flange portions 34 a and 34 b that face each other at a position sandwiching the discontinuous portion 33.
- the one flange portion 34a is formed with a through hole 35, which is one mounting hole, in a twisted positional relationship with respect to the central axis of the base portion 31a.
- the other flange portion 34b is formed with a screw hole 36, which is the other mounting hole, at a position aligned with the through hole 35.
- the male serration portion 37 formed on the outer peripheral surface of the front end portion of the output shaft 12a is replaced with the female serration portion 38 formed on the inner peripheral surface of the base portion 31a. Is engaged.
- the bolt 39 inserted through the through hole 35 is screwed into the screw hole 36 and further tightened.
- the base 31a is coupled and fixed to the front end portion of the output shaft 12a by narrowing the width of the discontinuous portion 33 and reducing the diameter of the base 31a.
- the width dimension W 33 of the discontinuous portion 33 is smaller than the diameter dimension D 22 of the connecting pin 22 (W 33 ⁇ D 22 ).
- a locking groove 40 is formed around the entire circumference of the outer peripheral surface of the front end portion of the output shaft 12 a in the axial middle portion of the male serration portion 37.
- the flange portion of the bolt 39 is engaged.
- connection pin 22 exists between the front edge of the discontinuous portion 33 and the bolt 39 with respect to the axial direction of the base portion 31a, and one end of the connection pin 22 is present.
- the assembly position in the axial direction and the circumferential direction between the members is regulated.
- the one end part of the connection pin 22 is made visible through the discontinuous part 33 from the outside of one yoke 29a (it can image
- one end portion of the connecting pin 22 is present at a position where it can be seen through the discontinuous portion 33 from the outside of one yoke 29a. For this reason, for example, when an inspection is performed on the assembly line, the presence of one end of the connecting pin 22 is determined even if the base 31a of the yoke 29a is externally fixed to the front end of the output shaft 12a.
- the connection pin 22 is provided inside the through holes 23 and 24 on the outer diameter side and the inner diameter side based on visual confirmation from the outside through the discontinuous portion 33 (or by photographing with a camera and confirming by image diagnosis). It can be confirmed whether or not it is press-fitted.
- the width dimension W 33 of the discontinuous portion 33 is smaller than the diameter dimension D 22 of the connecting pin 22 (W 33 ⁇ D 22 ). Is in contact with or in close proximity to the inner peripheral surface of the base portion 31a and the portion adjacent to both sides of the discontinuous portion 33 in the circumferential direction. Further, the other end portion of the connecting pin 22 (the rear end portion in the drawing in FIG. 1 and the left end portion in FIG. 2) is in contact with the distant portion 33 on the inner peripheral surface of the base portion 31a. It is in close contact or close proximity.
- the axial displacement of the connecting pin 22 with respect to the outer diameter side and inner diameter side through-holes 23 and 24 is based on the engagement with the displacement restricting part which is a part (the part which is in contact with or close to both ends). It can be regulated to a sufficiently small range. In the case of the present embodiment, specifically, a range in which the axial displacement of the connecting pin 22 is maintained in a state where the connecting pin 22 is stretched between the outer diameter side and inner diameter side through holes 23 and 24. Can be regulated. Therefore, regardless of repeated use, the state where the front end portion of the output shaft 12a and the front end portion of the torsion bar 13 are connected by the connecting pin 22 so as to transmit torque can be maintained.
- one end portion of the connecting pin 22 is set so as to be in a position in phase with the discontinuous portion 33 in the circumferential direction of the base portion 31a. If it is not necessary to visually check the connecting pin 22 from the outside, it is not necessary to match the connecting pin 22 and the discontinuous portion 33 to the same phase. In this case, since it is not necessary to match the connecting pin 22 and the discontinuous portion 33 to the same phase, the connecting step between the front end portion of the output shaft 12a and the front end portion of the torsion bar 13 can be performed in a short time.
- the width of the discontinuous portion 33 is the diameter of the connecting pin 22. Therefore, the axial displacement of the connecting pin 22 can be suppressed.
- FIG. 7 A third embodiment of the present invention will be described with reference to FIG. Also in the present embodiment, the position and range of one end of the connecting pin 22 that can be viewed from the outside of the yoke 29a are different from those in the first embodiment shown in FIGS.
- one end in the width direction (upper end portion in FIG. 7) that is a part of one end portion of the connecting pin 22 or the middle. The portion is hidden on the inner diameter side of the other flange portion 34b. Only the other radial end portion (the lower end portion in FIG. 7) that is the remaining portion of the one end portion of the connecting pin 22 is visible through the discontinuous portion 33 from the outside of the yoke 29a.
- Other configurations and operational effects are the same as those in the first and second embodiments.
- FIG. 8 A fourth embodiment of the present invention will be described with reference to FIG. Also in the present embodiment, the position and range of one end of the connecting pin 22 that can be viewed from the outside of the yoke 29a are different from those in the first embodiment shown in FIGS.
- the front end portion (left end portion in FIG. 8) or the intermediate portion, which is a part of one end portion of the connecting pin 22, is located at the front end edge portion of the discontinuous portion 33 of the base portion 31a of the yoke 29a. It is hidden on the inner diameter side of the front end portion of the base portion 31a. Only the rear end portion (the right end portion in FIG.
- FIGS. 10-10 A sixth embodiment of the present invention will be described with reference to FIGS. Also in the present embodiment, the position and range of one end of the connecting pin 22 that can be viewed from the outside of the yoke 29a are different from those in the first embodiment shown in FIGS.
- a front end portion left end portion in FIG. 10
- an intermediate portion which is a part of one end portion of the connecting pin 22
- the rear end portion the right end portion in FIG.
- FIG. 13 A seventh embodiment of the present invention will be described with reference to FIG. Also in the present embodiment, the position and range of one end of the connecting pin 22 that can be viewed from the outside of the yoke 29a are different from those in the first embodiment shown in FIGS.
- a rear end portion at the rear end portion of the discontinuous portion 33 of the base portion 31a of the yoke 29a, a rear end portion (right end portion in FIG. 13) or an intermediate portion which is a part of one end portion of the connecting pin 22.
- the front end portion left end portion in FIG.
- one end portion of the connecting pin 22 exists at a position that is in phase with the discontinuous portion 33 in the circumferential direction of the base portion 31a. Even if it is a case where it does, it can fully suppress that the connecting pin 22 displaces to an axial direction with respect to each outer-diameter side and inner diameter side through-holes 23 and 24.
- the diameter D 22 of the connecting pin 22 the relationship between the width W 33 of the discontinuous portion 33 is not limited to W 33 ⁇ D 22.
- FIG. 15 A ninth embodiment of the present invention will be described with reference to FIG. Also in the present embodiment, the position and range of one end of the connecting pin 22 that can be viewed from the outside of the yoke 29a are different from those in the first embodiment shown in FIGS.
- the width direction half portion of the front half portion (left half portion in FIG. 15) of one end portion of the connecting pin 22 (The upper half of FIG. 15) is hidden on the inner diameter side of the other flange portion 34b. Further, the other half in the width direction of the front half of the connecting pin 22 (the lower half of FIG.
- the rear half of the connecting pin 22 (the right half of FIG. 15) is visible from the outside of the yoke 29a through the discontinuous portion 33. Further, the rear half of the connecting pin 22 (the right half of FIG. 15) is located behind the base 31a and exposed to the outside so that it can be seen. In the case of this embodiment, the rear half of the other end of the connecting pin 22 is also located behind the base 31a and exposed to the outside so that it can be seen. Other configurations and operational effects are the same as those in the first and second embodiments.
- the torque transmission unit of the present invention is installed between the front end portion of the steering shaft and the rear end portion of the intermediate shaft, for example, between the front end portion of the intermediate shaft and the pinion constituting the steering gear unit. You can also.
- the power steering device used by incorporating the torque transmission unit of the present invention is not limited to an electric type, and may be a hydraulic type. In this case, the position where the auxiliary power is applied in the steering device is not particularly limited. That is, the torque transmission unit of the present invention can be used by being incorporated at an appropriate position in various conventionally known electric or hydraulic power steering apparatuses having various structures.
- the position of the opening of the outer diameter side through hole 23 formed at one end of the torque transmission shaft S is as shown in FIGS. 16 (A) to 16 (C) and FIG. Further, it may be a part of the male serration portion 37 of the torque transmission shaft S (output shaft 12a) (a portion engaging with the female serration portion provided on the inner peripheral surface of the base portion of the yoke), or FIG. As shown in FIG. 17C, it may be a portion of the torque transmission shaft S that is out of the male serration portion 37 (a portion that does not engage with the female serration portion). In the case of the former ⁇ FIG. 16A to FIG. 16C and FIG.
- the cross-sectional shape of the outer peripheral surface of the one end portion of the torque transmission shaft S is not particularly limited as long as the torque can be transmitted based on the engagement with the inner peripheral surface of the base portion of the yoke.
- the cross-sectional shapes shown in FIGS. 18A to 18D may be used.
- both end portions of the connecting pin be visible from the outside of the yoke through the discontinuous portion of the base portion of the yoke. That is, when the present invention is carried out, a part of both ends of the connecting pin is placed on the base in a state in which the discontinuous portion of the base of the yoke and the both ends of the connecting pin are shifted from each other in the circumferential direction.
- a configuration in which the base end edge is exposed to the outside may be employed.
- the width dimension of the discontinuous part of the base part may be smaller than the diameter dimension of the connecting pin, or may be larger than this diameter dimension.
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Abstract
Description
尚、本明細書に於いて、前後方向は、自動車の進行方向によるもので、図2、6、11、16~18を除く各図の左側が「前側」となり、同じく右側が「後側」となる。
しかしながら、上述した外嵌固定をする場合に、図21に示した構造の場合の様に、連結ピン22の一方の端部が、ヨーク29の基部31に形成された不連続部(スリット)33の範囲内の位置に来てしまう場合がある。
その場合、不連続部33の幅寸法が連結ピン22の直径寸法よりも大きい寸法であると、トルク伝達ユニットの繰り返しの使用によって、連結ピン22が出力軸12aに対して連結ピン22の軸方向に変位する可能性を否定できず、改善の余地がある。
中空状に造られ、一端部の径方向反対側となる2箇所位置に互いに同心に且つ径方向に形成された外径側貫通孔を有するトルク伝達軸と、
前記トルク伝達軸の内径側に挿通されると共に、一端部の前記外径側貫通孔と整合する位置に径方向に形成された内径側貫通孔を有するトーションバーと、
前記外径側貫通孔、及び前記内径側貫通孔同士の間に掛け渡す状態で、前記外径側貫通孔、及び前記内径側貫通孔に挿入される連結ピンと、
円周方向1箇所に不連続部を有する一部切欠円筒状の基部を備え、該基部が、前記不連続部を挟む位置に形成された1対のフランジ部と、前記1対のフランジ部の互いに整合する位置に形成された1対の取付孔とを有するヨークと、
前記ヨークの基部を前記トルク伝達軸の一端部に外嵌した状態で、前記取付孔に挿通又は螺合させて、前記不連続部の幅を狭める事により、前記基部を前記トルク伝達軸の一端部に結合固定するボルトと、
を備える。
又、ボルトの取付孔への挿通又は螺合とは、具体的には、1対の取付孔を通孔として、該通孔に挿通し、更に先端部に螺合したナットに対して締め付けるか、或いは、一方の取付孔を通孔とし、該通孔を挿通し、他方の取付孔であるねじ孔に螺合し、更に締め付けるものであってもよい。
前記連結ピンの両端部と前記両変位規制部との係合に基づいて、前記外径側貫通孔、及び前記内径側貫通孔に対する前記連結ピンの軸方向変位が規制される事により、前記外径側貫通孔、及び前記内径側貫通孔同士の間に前記連結ピンが掛け渡された状態が維持されてもよい。
本発明の第1実施形態に就いて、図1~4を参照しつつ説明する。尚、本実施形態の特徴は、電動アシスト装置を構成する、トルク伝達軸である出力軸12aの前端部と、自在継手5aを構成する一方のヨーク29aとの結合部にある。その他の部分の構造及び作用は、図19~20に示した従来構造の場合と同様であるから、重複する図示並びに説明はできるだけ省略若しくは簡略にし、以下、本実施形態の特徴部分、並びに、先に説明しなかった部分を中心に説明する。
又、この状態での不連続部33の幅寸法W33は、連結ピン22の直径寸法D22よりも小さく(W33<D22)なっている。又、図示の構造の場合には、出力軸12aの前端部外周面のうち、雄セレーション部37の軸方向中間部に、全周に亙り係止溝40を形成して、係止溝40にボルト39の杆部を係合させている。これにより、出力軸12aの前端部に対する一方のヨーク29aの軸方向の位置決めが図れると共に、ボルト39の締め付けが緩んだ場合でも、出力軸12aと一方のヨーク29aとが軸方向に分離する事を防止できる。
この場合、連結ピン22と不連続部33とを同位相に合わせる必要がないので、出力軸12aの前端部とトーションバー13の前端部との連結工程を短時間で行うことが可能となる。
連結ピン22と不連続部33との位相がランダムであり、連結ピン22と不連続部33の位相が合ってしまうことがあっても、不連続部33の幅寸法は連結ピン22の直径寸法よりも小さく設定されているので前記連結ピン22の軸方向変位を抑制することができる。
本発明の第2実施形態に就いて、図5~6により説明する。本実施形態の場合には、ヨーク29aの外部から目視可能となる連結ピン22の一端部の位置及び範囲が、図1~3に示した第1実施形態の場合と異なる。
本実施形態の場合には、ヨーク29aの基部31aの不連続部33の前端寄り部分に於いて、連結ピン22の一端部の一部である幅方向片半部(図5の上半部)が、他方のフランジ部34bの内径側に隠れている。そして、連結ピン22の一端部の残部である幅方向他半部(図5の下半部)のみが、ヨーク29aの外部から、不連続部33を通じて目視可能となっている。この様な構成を採用する為に、本実施形態の場合には、図6に示す様に、基部31aと、出力軸12a及びトーションバー13との円周方向に関する互いの位置関係を、第1実施形態の場合(図2参照)と異ならせている。
その他の構成及び作用効果は、第1実施形態の場合と同様である。
本発明の第3実施形態に就いて、図7により説明する。本実施形態の場合も、ヨーク29aの外部から目視可能となる連結ピン22の一端部の位置及び範囲が、図1~3に示した第1実施形態の場合と異なる。
本実施形態の場合には、ヨーク29aの基部31aの不連続部33の前端寄り部分に於いて、連結ピン22の一端部の一部である幅方向片端部(図7の上端部)乃至中間部が、他方のフランジ部34bの内径側に隠れている。そして、連結ピン22の一端部の残部である径方向他端部(図7の下端部)のみが、ヨーク29aの外部から、不連続部33を通じて目視可能となっている。
その他の構成及び作用効果は、第1及び第2実施形態の場合と同様である。
本発明の第4実施形態に就いて、図8により説明する。本実施形態の場合も、ヨーク29aの外部から目視可能となる連結ピン22の一端部の位置及び範囲が、図1~3に示した第1実施形態の場合と異なる。
本実施形態の場合には、ヨーク29aの基部31aの不連続部33の前端縁部分に於いて、連結ピン22の一端部の一部である前端部(図8の左端部)乃至中間部が、基部31aの前端部の内径側に隠れている。そして、連結ピン22の一端部の残部である後端部(図8の右端部)のみが、ヨーク29aの外部から、不連続部33を通じて目視可能となっている。この様な構成を採用する為に、本実施形態の場合には、第1実施形態の場合に比べて、出力軸12aの前端部の軸方向寸法を少しだけ前方に延長すると共に、連結ピン22の設置箇所(外径側貫通孔23の形成箇所)を少しだけ前方にずらしている。
その他の構成及び作用効果は、第1実施形態の場合と同様である。
本発明の第5実施形態に就いて、図9により説明する。本実施形態の場合も、ヨーク29aの外部から目視可能となる連結ピン22の一端部の位置及び範囲が、図1~3に示した第1実施形態の場合と異なる。
本実施形態の場合には、ヨーク29aの基部31aの不連続部33の前端縁部分に於いて、連結ピン22の一端部の一部である約3/4部分が、基部31aの前端部及び他方のフランジ部34bの内径側に隠れている。そして、連結ピン22の一端部の残部である約1/4部分のみが、ヨーク29aの外部から、不連続部33を通じて目視可能となっている。
その他の構成及び作用効果は、第1、第2、及び第4実施形態の場合と同様である。
本発明の第6実施形態に就いて、図10~12により説明する。本実施形態の場合も、ヨーク29aの外部から目視可能となる連結ピン22の一端部の位置及び範囲が、図1~3に示した第1実施形態の場合と異なる。
本実施形態の場合には、ヨーク29aの基部31aの不連続部33の前後方向中間部に於いて、連結ピン22の一端部の一部である前端部(図10の左端部)乃至中間部が、ヨーク29aの外部から、不連続部33を通じて目視可能となっている。これに対し、連結ピン22の一端部の残部である後端部(図10の右端部)が、ボルト39の杆部の内径側に隠れている。この様な構成を採用する為に、本実施形態の場合には、第1実施形態の場合に比べて、出力軸12aの前端部に対する連結ピン22の設置箇所(外径側貫通孔23の形成箇所)を少しだけ後方にずらせている。又、本実施形態の場合には、ボルト39の杆部が、連結ピン22の一端部に対する変位規制部となる。
その他の構成及び作用効果は、第1実施形態の場合と同様である。
本発明の第7実施形態に就いて、図13により説明する。本実施形態の場合も、ヨーク29aの外部から目視可能となる連結ピン22の一端部の位置及び範囲が、図1~3に示した第1実施形態の場合と異なる。
本実施形態の場合には、ヨーク29aの基部31aの不連続部33の後端部に於いて、連結ピン22の一端部の一部である後端部(図13の右端部)乃至中間部が、ヨーク29aの外部から、不連続部33を通じて目視可能となっている。これに対し、連結ピン22の一端部の残部である前端部(図13の左端部)が、ボルト39の杆部の内径側に隠れている。本実施形態の場合も、ボルト39の杆部が、連結ピン22の一端部に対する変位規制部となる。
その他の構成及び作用効果は、第1及び第6実施形態の場合と同様である。
本発明の第8実施形態に就いて、図14により説明する。本実施形態の場合も、ヨーク29aの外部から目視可能となる連結ピン22の一端部の位置及び範囲が、図1~3に示した第1実施形態の場合と異なる。
本実施形態の場合には、ヨーク29aの基部31aの不連続部33の後端部に於いて、連結ピン22の一端部の一部である約2/3部分が、ボルト39の杆部及び他方のフランジ部34bの内径側に隠れている。そして、連結ピン22の一端部の残部である約1/4部分のみが、ヨーク29aの外部から、不連続部33を通じて目視可能となっている。本実施形態の場合も、ボルト39の杆部が、連結ピン22の一端部に対する変位規制部となる。
その他の構成及び作用効果は、第1、第2、及び第7実施形態の場合と同様である。
本発明の第9実施形態に就いて、図15により説明する。本実施形態の場合も、ヨーク29aの外部から目視可能となる連結ピン22の一端部の位置及び範囲が、図1~3に示した第1実施形態の場合と異なる。
本実施形態の場合には、ヨーク29aの基部31aの不連続部33の後端縁部分に於いて、連結ピン22の一端部の前半部(図15の左半部)の幅方向片半部(図15の上半部)が、他方のフランジ部34bの内径側に隠れている。又、連結ピン22の前半部の幅方向他半部(図15の下半部)が、ヨーク29aの外部から、不連続部33を通じて目視可能となっている。更に、連結ピン22の後半部(図15の右半部)が、基部31aよりも後方に位置して外部に露出し、目視可能となっている。又、本実施形態の場合には、連結ピン22の他端部の後半部も、基部31aよりも後方に位置して外部に露出し、目視可能となっている。
その他の構成及び作用効果は、第1及び第2実施形態の場合と同様である。
又、本発明のトルク伝達ユニットを組み込んで使用するパワーステアリング装置は、電動式に限らず、油圧式であっても良い。又、この場合に、ステアリング装置内での補助動力を付与する位置は、特に問わない。
つまり、本発明のトルク伝達ユニットは、従来から知られている各種構造の電動式又は油圧式のパワーステアリング装置に於ける、適宜の位置に組み込んで使用する事ができる。
前者{図16(A)~図16(C)及び図12}の場合には、外径側貫通孔23の開口部から見える連結ピン22の端面と、雄セレーション部37の表面との光の反射方向が大きく異なる為、連結ピン22の端面を目視により確認し易い(カメラで撮影して画像診断により確認し易い)と言った利点がある。この場合の確認のし易さをより顕著にする為に、連結ピン22の端面を平滑面にする加工(例えば鏡面仕上げ加工)を施しておく事が好ましい。
尚、図17(B)に示す様に、係止溝40の底面に外径側貫通孔23の端部を開口させる構造においても、ボルトを避ける様に斜めから覗くと、当該開口から連結ピン22の端面を目視できる場合がある。
2 ステアリングシャフト
3 ステアリングコラム
4 電動アシスト装置
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 ハウジング
12、12a 出力軸
13 トーションバー
14 トルク検出器
15 ウォーム式減速機
16 蓋体
17 本体
18 ボルト
19 玉軸受
20 玉軸受
21 連結孔部
22 連結ピン
23 外径側貫通孔
24 内径側貫通孔
25 トルク検出用凹凸部
26 トルク検出用スリーブ
27 トルク検出用コイルユニット
28 ウォームホイール
29、29a ヨーク
30 ヨーク
31、31a 基部
32 腕部
33 不連続部(スリット)
34a、34b フランジ部
35 通孔
36 ねじ孔
37 雄セレーション部
38 雌セレーション部
39 ボルト
40 係止溝
Claims (5)
- 中空状に造られ、一端部の径方向反対側となる2箇所位置に互いに同心に且つ径方向に形成された外径側貫通孔を有するトルク伝達軸と、
前記トルク伝達軸の内径側に挿通されると共に、一端部の前記外径側貫通孔と整合する位置に径方向に形成された内径側貫通孔を有するトーションバーと、
前記外径側貫通孔、及び前記内径側貫通孔同士の間に掛け渡す状態で、前記外径側貫通孔、及び前記内径側貫通孔に挿入される連結ピンと、
円周方向1箇所に不連続部を有する一部切欠円筒状の基部を備え、該基部が、前記不連続部を挟む位置に形成された1対のフランジ部と、前記1対のフランジ部の互いに整合する位置に形成された1対の取付孔とを有するヨークと、
前記ヨークの基部を前記トルク伝達軸の一端部に外嵌した状態で、前記取付孔に挿通又は螺合させて、前記不連続部の幅を狭める事により、前記基部を前記トルク伝達軸の一端部に結合固定するボルトと、
を備えるトルク伝達ユニットであって、
前記連結ピンの両端部と、前記ヨーク又は前記ボルトの一部である変位規制部との係合に基づいて、前記外径側貫通孔、及び前記内径側貫通孔に対する前記連結ピンの軸方向変位が規制される事により、前記外径側貫通孔の少なくとも一方と前記内径側貫通孔との間に前記連結ピンが掛け渡された状態が維持される事を特徴とするトルク伝達ユニット。 - 前記連結ピンの少なくとも一方の前記端部が、前記ヨークの外部から目視可能な位置に存在する請求項1に記載したトルク伝達ユニット。
- 前記連結ピンの一端部に対する前記変位規制部が、前記基部の内周面又は前記ボルトの杆部であり、前記連結ピンの他端部に対する前記変位規制部が、前記基部の内周面であり、
前記連結ピンの両端部と前記両変位規制部との係合に基づいて、前記外径側貫通孔、及び前記内径側貫通孔に対する前記連結ピンの軸方向変位が規制される事により、前記外径側貫通孔、及び前記内径側貫通孔同士の間に前記連結ピンが掛け渡された状態が維持される請求項1に記載したトルク伝達ユニット。 - 前記基部の不連続部の幅寸法が、前記連結ピンの直径寸法よりも小さい請求項1~3のいずれか1項に記載したトルク伝達ユニット。
- 前記連結ピンの一端部が、前記ヨークの外部から、前記不連続部を通じて目視可能な位置に存在する請求項4に記載したトルク伝達ユニット。
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JP6304368B2 (ja) | 2018-04-04 |
CN106062396A (zh) | 2016-10-26 |
JPWO2015136951A1 (ja) | 2017-04-06 |
US10288125B2 (en) | 2019-05-14 |
EP3101294A1 (en) | 2016-12-07 |
EP3101294B1 (en) | 2019-05-01 |
CN106062396B (zh) | 2018-10-26 |
EP3101294A4 (en) | 2017-05-24 |
US20160369849A1 (en) | 2016-12-22 |
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