WO2005102820A1 - 車両ステアリング用伸縮軸 - Google Patents
車両ステアリング用伸縮軸 Download PDFInfo
- Publication number
- WO2005102820A1 WO2005102820A1 PCT/JP2005/008385 JP2005008385W WO2005102820A1 WO 2005102820 A1 WO2005102820 A1 WO 2005102820A1 JP 2005008385 W JP2005008385 W JP 2005008385W WO 2005102820 A1 WO2005102820 A1 WO 2005102820A1
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- WO
- WIPO (PCT)
- Prior art keywords
- shaft
- torque
- steering
- male
- panel
- 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
- 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
- B62D1/19—Steering columns yieldable or adjustable, e.g. tiltable incorporating energy-absorbing arrangements, e.g. by being yieldable or collapsible
- B62D1/192—Yieldable or collapsible columns
-
- 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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- 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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C29/00—Bearings for parts moving only linearly
- F16C29/007—Hybrid linear bearings, i.e. including more than one bearing type, e.g. sliding contact bearings as well as rolling contact bearings
-
- 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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C29/00—Bearings for parts moving only linearly
- F16C29/12—Arrangements for adjusting play
- F16C29/123—Arrangements for adjusting play using elastic means
-
- 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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C3/00—Shafts; Axles; Cranks; Eccentrics
- F16C3/02—Shafts; Axles
- F16C3/03—Shafts; Axles telescopic
- F16C3/035—Shafts; Axles telescopic with built-in bearings
-
- 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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/58—Raceways; Race rings
-
- 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
- F16D3/06—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive adapted to specific functions specially adapted to allow axial displacement
- F16D3/065—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive adapted to specific functions specially adapted to allow axial displacement by means of rolling elements
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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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2326/00—Articles relating to transporting
- F16C2326/20—Land vehicles
- F16C2326/24—Steering systems, e.g. steering rods or columns
Definitions
- the present invention relates to a telescopic shaft for a vehicle steering which is assembled into a steering shaft of a vehicle, and a male shaft and a female shaft are fitted to each other so as to be non-rotatable and slidable.
- the telescopic shaft of the steering mechanism of an automobile must be capable of absorbing the axial displacement that occurs when the automobile runs and not transmitting the displacement and vibration to the steering wheel.
- the driver must be able to move the steering wheel in the axial direction and adjust its position in order to obtain the optimal position for driving the car.
- the telescopic shaft should reduce rattling, reduce rattling on the steering wheel, and reduce sliding resistance during axial sliding operation. Is required.
- the male shaft of the telescopic shaft is coated with a nylon film, and the sliding part is coated with grease to absorb or reduce metal noise, metal tapping noise, etc., and reduce sliding resistance. And the rotation direction has been reduced.
- the wear of the coating film progresses due to the progress of use, and the rotational force may become larger.
- the nylon membrane changes its volume, and the sliding resistance becomes extremely large and wear is remarkably accelerated, so that the rotational direction becomes large. And so on.
- German Patent DE 37 30 39 3 C2 discloses that between a plurality of pairs of axial grooves formed respectively on the outer peripheral surface of the male and the inner peripheral surface of the female shaft, Axial phase of both shafts A spherical body, which is a torque transmitting member that rolls during pair movement, is fitted.
- a torque transmitting member is provided between a radially inner or outer side of a spherical body as a torque transmitting member and each pair of axial grooves.
- a plate panel which is an elastic body for preloading, is provided for applying a preload to the male shaft and the female shaft via the spherical body.
- the spherical body which is the torque transmitting member, is pre-pressed by the plate panel to the female shaft so that there is no residual vibration.
- the male and female shafts can slide in the axial direction with a stable sliding load without backlash.
- the plate panel when transmitting torque, the plate panel allows the spherical body, which is the torque transmitting member, to be constrained in the circumferential direction, so that the male and female shafts are prevented from rattling in the rotation direction, Torque can be transmitted in a rigid state.
- one plate panel for preloading a set of torque transmitting members is provided.
- the other panel panel that preloads another set of torque transmitting members (spherical bodies) that are adjacent in the circumferential direction is connected in the circumferential direction by a web that is an arc-shaped connecting portion extending in the circumferential direction.
- This connecting portion (web) applies a tensile force or a compressive force to the two panel panels to generate a preload on the two panel panels.
- the male shaft, the panel panel, the spherical body, and the female shaft narrow each other and transmit torque, so that the contact point between the spherical body and the panel panel is Very high surface pressure.
- high stress is generated in the panel panel, causing permanent set of the panel panel to cause settling, making it difficult to maintain long-term preload performance and hindering the life of the steering shaft.
- the panel panel slides in the circumferential direction from the axial groove, causing a decrease in the transmission torque, and the degree of hysteresis cannot be controlled, resulting in excessive hysteresis. Then, there is a fear that it may happen.
- the contact angle between the male shaft, the spherical body, the panel panel, and the female shaft is not on the same line.
- the steering shaft may not be able to obtain the necessary linear torsional characteristics, but may not be able to obtain proper hysteresis.
- the spline structure is a sliding slide, so that no matter how much the circumferential play is reduced, it is physically impossible to completely eliminate the play. Impossible. Disclosure of the invention
- the present invention has been made in view of the above-described circumstances, and has as its object to provide a telescopic shaft for a vehicle steering that can reliably prevent a rotation direction and transmit torque in a highly rigid state.
- the telescopic shaft for vehicle steering is provided with a vehicle steering shaft.
- a telescopic shaft for a vehicle steering in which a male shaft and a female shaft are non-rotatably and slidably fitted into a tearing shaft,
- the telescopic shaft The telescopic shaft
- a preload torque transmission unit that transmits the steering torque while preloading between the two shafts
- a rigid torque transmission unit that transmits a steering torque between the two shafts by a rigid body contact
- the torsional rigidity generated by the preload torque transmitting section is 5 Nm // deg or more.
- the preload torque transmitting portion includes an elastic body between at least one row of axial grooves formed on an outer peripheral surface of the male shaft and an inner peripheral surface of the female shaft, respectively.
- the rigid torque transmission unit includes:
- a second torque transmitting member is interposed between at least one other row of grooves formed on the outer peripheral surface of the male shaft and the inner peripheral surface of the female shaft.
- the first torque transmitting member includes a rolling element that rolls when the two shafts relatively move in the axial direction
- the second torque transmitting member is formed of a sliding body that slides and slides when the two wheels are relatively moved in the axial direction.
- the predetermined torsional rigidity is generated by a frictional force between the male shaft and the elastic body.
- the predetermined torsional rigidity is generated by a frictional force and an urging force between the male shaft and the elastic body.
- an angle from the neutral position of the rigid torque transmitting portion or the second torque transmitting member to the start of the rotation by the contact of the rigid body is 0.01 to 0. It is preferable that the angle is set within a range of 25 °.
- the torsional stiffness generated in the preload torque transmitting unit is 5 NmZ deg or more. The play can be suppressed and steering stability can be improved.
- FIG. 1 is a side view of a steering mechanism of a vehicle to which a telescopic shaft for vehicle steering according to an embodiment of the present invention is applied.
- Fig. 2A is a characteristic diagram of the rotation angle and the torque when the conventional structure of the telescopic shaft is used
- Fig. 2B is the rotational angle and the torque of the telescopic shaft with no vibration.
- FIG. 3 is a longitudinal sectional view of the telescopic shaft for vehicle steering according to the embodiment of the present invention.
- FIG. 4 is a cross-sectional view along the line IX-IX of FIG.
- FIG. 5 is a perspective view of a plate panel that is an elastic body.
- FIG. 6 is a partial cross-sectional view of the telescopic shaft for vehicle steering according to the embodiment of the present invention in a state where a torque load is not applied.
- FIG. 7 is a partial cross-sectional view of the telescopic shaft for vehicle steering according to the embodiment of the present invention in a state where a torque load is started.
- FIG. 1 is a side view of a steering mechanism of a vehicle to which a telescopic shaft for vehicle steering according to an embodiment of the present invention is applied.
- an upper steering shaft portion 120 (a steering column 103, which is attached to a vehicle body side strength member 100 via an upper bracket 101 and a lower bracket 102). (Including a swinging shaft 104 rotatably held by the steering column 103), a steering wheel 105 mounted on the upper end of the steering shaft 104, and a lower end of the steering shaft 104.
- a steering rack shaft 112 connected to a pinion shaft 109, and a steering rack shaft 112 supported by the steering rack shaft 112 and fixed to another frame 110 of the vehicle body via an elastic body 111.
- Steering mechanism portion and a ring rack support 1 1 3. 107 uses a telescopic shaft for vehicle steering (hereinafter referred to as a telescopic shaft) according to the embodiment of the present invention.
- the lower steering shaft 107 has a male shaft and a female shaft fitted to each other.
- a mouth steering shaft 107 has the axial displacement generated when a vehicle travels. It is necessary to have a performance that absorbs and does not transmit the displacement and vibration on the steering wheel 105. This performance is due to the fact that the body has a sub-frame structure, and the member 100 that fixes the upper part of the steering mechanism and the frame 110 to which the steering rack support member 113 is fixed are separate bodies.
- the steering rack support member 113 is fastened and fixed to the frame 110 via an elastic body 111 such as rubber.
- the operator contracts the extension shaft once and then fits it to the pinion shaft 109 for expansion and contraction. May be required.
- the upper steering wheel at the top of the steering mechanism The bearing shaft section 120 is also formed by fitting a male shaft and a female shaft.
- such an upper steering shaft section 120 is suitable for a driver to drive a car.
- the function of moving the position of the steering wheel 105 in the axial direction and adjusting the position is required, so that the function of expanding and contracting in the axial direction is required.
- the telescopic shaft reduces the rattling noise of the fitting part, reduces the backlash on the steering wheel 105, and reduces the sliding resistance when sliding in the axial direction. Reduction is required.
- Fig. 2A is a characteristic diagram of the rotation angle and the torque when the conventional structure of the telescopic shaft is used
- Fig. 2B is the rotational angle and the torque of the telescopic shaft with no vibration.
- Fig. 2A shows the characteristics of a conventional telescopic shaft.
- Gauge means that there is a region where torque transmission is not performed at all due to the presence of a gap without using a preload mechanism. Therefore, in theory, the torsional rigidity of this part is ONm / deg.
- the torsional stiffness is not stable because the male shaft and the female shaft may be twisted or fall down, and the torsional stiffness is not stable, ranging from 0 to several NmZ deg. Characteristic. This variation in characteristics is a factor that deteriorates steering stability and is not preferable.
- a predetermined torsional rigidity (Kl) NmZdeg can be maintained in a preload region near neutral.
- the torsional stiffness (K 1) near neutral in this characteristic is 5 NmZ de g or more. Therefore, when steering is performed in the preload area near neutral, torque is transmitted without any loss at all.
- the steering torque can be transmitted by the rolling elements 7 while preloading between the male shaft 1 and the female shaft 2 via the elastic body 9.
- a telescopic shaft having a hybrid structure that has the advantages of rolling and sliding without any evening, and can maintain stable steering performance without feeling a delay in vehicle behavior during steering.
- the torsional stiffness (K1) of 5Nm / deg was calculated from the minimum required torsional stiffness based on a steering stability test using a vehicle. When the driver actually steers, the steering speed is said to be 10Hz or less. In other words, when steering at 10 Hz or less, if the torsional rigidity (K1) is 5 Nm / deg or more, stable steering performance can be maintained without feeling a delay in vehicle behavior during steering. Furthermore, when the steering torque is equal to or more than a predetermined value, the predetermined torsional stiffness (K2) Nm deg can be maintained by the contact of the rigid body, so that the steering torque can be transmitted. That is, as described later, the steering torque can be transmitted between the male shaft 1 and the female shaft 2 by the cylindrical body 8.
- the angle (indicated as the stopper angle in FIG. 2B) from the neutral position of the cylinder 8 (that is, the stopper pin) to the start of its rotation by the contact of the rigid body is 0.01 to It is set in the range of 0.25 °.
- FIG. 3 is a longitudinal sectional view of the telescopic shaft for vehicle steering according to the embodiment of the present invention.
- FIG. 4 is a cross-sectional view taken along the line IX-IX of FIG.
- FIG. 5 is a perspective view of an elastic panel panel.
- the telescopic shaft 10 for vehicle steering includes a male shaft 1 and a female shaft 2 which are non-rotatably and slidably fitted to each other.
- three axial grooves 3 which are equally distributed in the circumferential direction at intervals of 120 degrees (phase) extend.
- three axial grooves 5 equally distributed at 120 ° intervals (phase) in the circumferential direction also extend on the inner peripheral surface of the female shaft 2. It is formed.
- the axial groove 3 of the male shaft 1 and the axial groove 5 of the female shaft 2 there are a plurality of rigid spherical bodies 7 that roll when the shafts 1 and 2 move relative to each other in the axial direction.
- the moving body or pole is interposed so that it can roll freely.
- the axial groove 5 of the female shaft 2 has a substantially circular arc shape or a Gothic arch shape in cross section.
- the axial groove 3 of the male shaft 1 is composed of a pair of inclined flat side surfaces 3a and a bottom surface 3b formed flat between the pair of flat side surfaces 3a.
- a leaf spring 9 for contacting and preloading the spherical body 7 is interposed.
- the plate panel 9 has a substantially arc-shaped spherical body-side contact portion 9a that comes into contact with the spherical body 7 at two points, and a predetermined circumferential distance from the spherical body-side contact portion 9a.
- the groove-side contact part 9b which can be in contact with the flat side surface 3a of the axial groove 3 of the male shaft 1 and the spherical body-side contact part 9a
- a biasing portion 9c bent so as to elastically bias the portion 9b away from each other; a flat bottom surface 9d facing the flat bottom surface 3b of the axial groove 3; have.
- the urging portion 9c has a substantially U-shape and is bent in a substantially arc shape, and the spherical-shaped contact portion 9a and the groove-side contact portion are formed by the bent urging portion 9c. 9b can be sexually biased to be spaced apart from each other.
- a minute gap (1) is set between the urging portion 9c or the groove surface side contact portion 9b and the planar side surface 3a of the axial groove 3.
- the tip of the groove side contact portion 9 b is moved in the direction of the arrow (G) so as not to contact the flat side surface 3 a of the axial groove 3. It is bent.
- the largest outer portion of the R shape of the biasing portion 9c or the groove surface side contact portion 9b, which is a bent portion, is set so as to be closest to the planar side surface 3a of the axial groove 3. This is due to the thickness of the bent part of the leaf spring 9 (biasing part 9c or groove side contact part 9b). In order to make all parts constant. This is because if the tip of the bent portion (the urging portion 9c or the contact portion 9b on the groove side) hits at various places, the torsional rigidity of the preload portion is not stabilized.
- the spherical body-side contact portion 9a that contacts the spherical body 7 is formed in a substantially arc shape larger than the radius of the spherical body 7. Thereby, the contact surface pressure with the spherical body 7 can be reduced as compared with the planar shape.
- three axial grooves 4 are formed extending at equal intervals (phase) in the circumferential direction at 120 ° intervals.
- three axial grooves 6 equally distributed in the circumferential direction at intervals of 120 degrees (phase) are also formed on the inner peripheral surface of the female shaft 2.
- a minute gap ( ⁇ 2) is set between the cylindrical body 8 and the axial groove 6 of the female shaft 2.
- the axial groove 6 of the female shaft 2 may always be in contact with somewhere in the axial direction.
- a small diameter portion 1a is formed at the end of the male shaft 1, a small diameter portion 1a is formed.
- the small-diameter portion la is provided with an annular stopper plate 11 for restricting the axial movement of the needle roller 8.
- the stopper plate 11 is composed of an axial preload elastic body 12 (ie, a disc spring) and a set of annular flat plates 13, 13 (ie, flat) that sandwiches the axial preload elastic body 12. Washers).
- the stopper plate 11 is fitted to the small-diameter portion 1a in the order of the flat plate 13, the elastic member for axial preload 12 and the flat plate 13, and the small-diameter portion 1a is firmly tightened by caulking. It is plastically deformed and fixed.
- the stopper plate 11 is fixed in the axial direction. Stopper hoop
- the fixing method of the rate 11 is not limited to caulking, but may be a retaining ring, a screwing means, a push nut, or the like. Also, the stopper plate 11 allows the plate 13 to abut against the needle roller 8 and the elastic member 12 for axial preload allows the needle roller 8 to be appropriately preloaded so as not to move in the axial direction. ing.
- the six axial grooves 5 and 6 of the female shaft 2 are radially interposed in the axial groove 5 and 6, and the outer peripheral surface of the male shaft 1 is axially coaxial with the six axial grooves 3 and 4.
- the six substantially arc-shaped projections 15 formed in the above are fitted.
- the male shaft 1 and the female shaft 2 can transmit torque, and can play a role of a fail-safe function.
- the projection 15 of the male shaft 1 is arranged in the axial direction with the spherical body 7 and the cylindrical body 8, it also serves as a stopper for regulating the axial movement of the spherical body 7 and the cylindrical body 8. 7. The possibility of the column 8 coming off is reduced, and the fail-safe function can be further improved.
- a lubricant may be applied between the axial groove 3 of the male shaft 1, the axial groove 5 of the female shaft 2, the leaf spring 9, and the spherical body 7. Further, a lubricant may be applied between the axial groove 4 and the cylindrical body 8 of the male shaft 1 and the axial groove 6 of the female shaft 2.
- the spherical body 7 is interposed between the male shaft 1 and the female shaft 2, and the leaf spring 9 moves the spherical body 7 so that the spherical body 7 does not stick to the female shaft 2.
- the preload prevents the rattling between the male shaft 1 and female shaft 2 without fail.
- the panel panel 9 elastically deforms to restrain the spherical body 7 in the circumferential direction, and the three rows of cylindrical bodies 8 interposed between the male shaft 1 and the female shaft 2 play the main role of torque transmission. To fulfill.
- the leaf spring 9 when torque is input from the male shaft 1, in the initial stage, the leaf spring 9 is preloaded, so there is no backlash and the leaf panel 9 generates a reaction force against the torque to transmit the torque. I do. At this time, the overall torque is transmitted in a state where the transmission torque and input torque between the male shaft 1, the panel panel 9, the spherical body 7, and the female shaft 2 are balanced. When the torque further increases, the gap in the rotation direction of the male shaft 1 and the female shaft 2 via the cylindrical body 8 disappears, and the subsequent increase in torque is transferred to the cylindrical body via the male shaft 1 and the female shaft 2. 8 communicate. Therefore, it is possible to reliably prevent the backlash in the rotation direction of the male shaft 1 and the female shaft 2 and transmit the torque in a highly rigid state.
- the cylindrical body 8 is provided in addition to the spherical body 7, the large load can be supported by the cylindrical body 8 when a large torque is input. Accordingly, the contact pressure between the axial groove 5 of the female shaft 2 and the spherical body 7 can be reduced to improve durability, and at the time of a large torque load, torque can be transmitted in a highly rigid state. Can be.
- a stable sliding load can be realized, torque in the rotating direction can be reliably prevented, and torque can be transmitted in a highly rigid state.
- the spherical body 7 is preferably a rigid pole.
- the rigid cylindrical body 8 is preferably a needle roller.
- the cylindrical body (hereinafter referred to as a needle roller) 8 receives the load by line contact, it has various effects such as a lower contact pressure than a pole that receives a load by point contact. Therefore, compared to the case where all rows are pole-rolled, The items are excellent.
- the contact roller can reduce the contact pressure lower, so the axial length can be shortened and the space can be used effectively. • If the same torque is transmitted, the contact pressure can be kept lower by the needle roller, so that an additional process for hardening the axial groove surface of the female shaft by heat treatment or the like is unnecessary.
- the dollar shaft plays the role of a key for transmitting torque between the male shaft 1 and the female shaft 2 and makes sliding contact with the inner peripheral surface of the female shaft 2.
- the length and arrangement of the roller can be changed according to the operating conditions, so it can be used for various applications without changing the design concept.
- needle rollers with different outer diameters can be manufactured at low cost in units of several micrometers, the gap between male shaft and needle roller and female shaft can be minimized by selecting the needle roller diameter. it can. Therefore, it is easy to improve the rigidity of the shaft in the torsional direction.
- the plate panel 9 is separated from the spherical body-side contact portion 9a, which contacts the spherical body 7 at two points, with a predetermined circumferential distance from the spherical body-side contact portion 9a.
- the groove-side contact portion 9b that contacts the planar side surface 3a of the axial groove 3 of the male shaft 1 and the spherical body-side contact portion 9a and the groove-side contact portion 9b are separated from each other. It has a pair of right and left biasing portions 9c that elastically bias and a bottom surface 9d facing the bottom surface 3b of the axial groove 3.
- the urging portion 9c has a substantially U-shape and is bent in a substantially arc shape, and the spherical-shaped contact portion 9a and the groove-side contact portion are formed by the bent urging portion 9c. 9b can be sexually biased to be spaced apart from each other. Accordingly, the spherical panel-side contact portion 9a of the panel panel 9 can sufficiently bend via the urging portion 9b, and the amount of bending can be sufficiently ensured.
- a space is provided between the spherical body-side contact portion 9a that contacts the spherical body 7 and the groove surface-side contact portion 9b that contacts the axial groove 3, and the space between them is It is linked to Therefore, the stress generated at the contact portion between the spherical body 7 and the leaf spring 9 at the time of setting can be reduced, and the set of the panel 9 due to permanent deformation can be prevented, and the desired preload performance can be maintained for a long period of time. Obtainable.
- the contact surface pressure with the spherical body 7 can be reduced as compared with the planar shape. preferable.
- the plate panel 9 can secure a sufficient amount of deflection, Since no excessive load (stress) is applied to the leaf spring 9 and the leaf spring 9, the stress generated at the point of contact with the spherical body 7 and the leaf spring 9 during torque transmission can be reduced. However, high stress is not generated, and “set” due to permanent deformation is prevented, and the preload performance can be maintained for a long time.
- the point of contact with the spherical body 7 is strong, and the portion exhibiting the panel properties is made easy to bend, so that a single member has both the race surface and the spring property.
- the cylindrical body 8 since the cylindrical body 8 mainly transmits torque, the structure is such that no excessive stress is generated between the male shaft 1, the female shaft 2, the plate panel, and the spherical body 7. Therefore, it is possible to prevent the occurrence of excessive stress in the leaf spring 9, prevent the set of the leaf spring 9, and maintain a desired preload performance for a long period of time, and additionally, strictly control dimensional accuracy.
- the leaf spring 9 and the race portion can be formed from a single material, and the assembly can be facilitated and the manufacturing cost can be reduced.
- FIG. 6 is a partial cross-sectional view of the telescopic shaft for vehicle steering according to the embodiment of the present invention in a state where a torque load is not applied.
- the chain line shows the state of the spherical body 7 and the leaf spring 9 before the female shaft 2 is fitted
- the solid line shows the spherical body 7 and the leaf spring after the female shaft 2 is fitted. State 9 is shown.
- FIG. 7 is a partial cross-sectional view of the telescopic shaft for vehicle steering according to the embodiment of the present invention in a state where a torque load is started.
- the first operation example is characterized in that the torsional rigidity (K 1) is generated by the frictional force between the male shaft 1 and the leaf spring 9 with 5 NmZ deg as the minimum value.
- the spherical body 7 is pressed in the direction of the arrow (X) by fitting the female shaft 2.
- lubricant such as grease is applied to the flat bottom surface 9 d of the panel panel 9 which is strongly pressed against the bottom surface 3 b of the axial groove 3.
- lubricant such as grease is applied to the flat bottom surface 9 d of the panel panel 9 which is strongly pressed against the bottom surface 3 b of the axial groove 3.
- FIG. 7 when a predetermined steering torque in the direction of the arrow (z) is applied to the male shaft 1, the male shaft 1 ⁇ leaf spring 9 ⁇ spherical body 7 ⁇ with the contact angle shown by the symbol (B) Torque is transmitted in the order of female shaft 2.
- the reason for generating the torsional rigidity with the minimum value of 5 NmZ deg is that the plane indicated by the symbol (A) Is the frictional force at (Second operation example of the embodiment)
- FIG. 6 is a partial cross-sectional view of the telescopic shaft for vehicle steering according to the embodiment of the present invention in a state where a torque load is not applied.
- the chain line shows the state of the spherical body 7 and the leaf spring 9 before the female shaft 2 is fitted
- the solid line shows the spherical body 7 and the leaf spring after the female shaft 2 is fitted. State 9 is shown.
- FIG. 7 is a partial cross-sectional view of the telescopic shaft for vehicle steering according to the embodiment of the present invention in a state where a torque load is started.
- the second operation example is characterized in that the torsional rigidity (K 1) is generated by the frictional force and the urging force of the male shaft 1 and the leaf spring 9 with 5 Nm / deg as the minimum value.
- the torsional stiffness when the torsional stiffness is tuned, that is, when a higher torsional stiffness is required, the frictional force and the load generated at the bent portion of the plate panel 9 (the biasing portion 9c) are obtained.
- the load on the panel panel 9 can be reduced by combining with the frictional force as compared with the case where the torsional rigidity is generated only by the bent portion (the biasing portion 9c) of the panel panel 9. That is, by preventing an excessive stress from being generated in the plate panel 9, “set” of the plate panel 9 can be suppressed, and the required preload performance can be maintained for a long period of time.
- the spherical body 7 is pressed in the direction of the arrow (X) by fitting the female shaft 2.
- the leaf spring 9 has a wedge angle ( ⁇ )
- the flat bottom surface 9 d is strongly pressed against the bottom surface 3 b of the axial groove 3 while being opened in both directions of the arrow (y).
- Lubricant such as grease is applied to the flat bottom surface 9 d of the panel panel 9 that is strongly pressed against the bottom surface 3 b of the axial groove 3. The same applies to other sliding surfaces.
- a predetermined steering torque in the direction of the arrow (z) is applied to the male shaft 1, the male shaft 1—the plate panel 9 ⁇ the spherical body 7 ⁇ with the contact angle indicated by the symbol (B). Torque is transmitted in the order of female shaft 2.
- the cylindrical body 8 makes a stronger contact between the male shaft 1 ⁇ the cylindrical body 8 ⁇ the female shaft 2 at the contact angle of point (D), and reduces the steering torque of the predetermined torsional rigidity (K2). To communicate.
- the elastic contact at the point (C) occurs before the rigid contact at the point (D). That is, the torsional rigidity is generated with the minimum value of 5 Nm / deg because of the frictional force on the surface indicated by the symbol (A) and the spring of the bent portion (biasing portion 9 c) of the plate spring 9. Force (biasing force).
Abstract
Description
Claims
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JP2004-131605 | 2004-04-27 | ||
JP2004131605A JP2005313691A (ja) | 2004-04-27 | 2004-04-27 | 車両ステアリング用伸縮軸 |
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CN108412903A (zh) * | 2018-05-22 | 2018-08-17 | 张家港汉升机械科技有限公司 | 一种具有自润滑和防尘功能的轴承 |
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CN101827741B (zh) * | 2007-10-15 | 2012-05-30 | 德昌机械株式会社 | 用于车辆的伸缩轴 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2003031250A1 (fr) * | 2001-10-01 | 2003-04-17 | Nsk Ltd. | Arbre telescopique de direction de vehicule |
JP2004122938A (ja) * | 2002-10-02 | 2004-04-22 | Nsk Ltd | 車両ステアリング用伸縮軸 |
JP2004122833A (ja) * | 2002-09-30 | 2004-04-22 | Nsk Ltd | 車両ステアリング用伸縮軸 |
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JPS60161251A (ja) * | 1984-01-31 | 1985-08-22 | Nissan Motor Co Ltd | 操舵装置 |
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Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2003031250A1 (fr) * | 2001-10-01 | 2003-04-17 | Nsk Ltd. | Arbre telescopique de direction de vehicule |
JP2004122833A (ja) * | 2002-09-30 | 2004-04-22 | Nsk Ltd | 車両ステアリング用伸縮軸 |
JP2004122938A (ja) * | 2002-10-02 | 2004-04-22 | Nsk Ltd | 車両ステアリング用伸縮軸 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN108412903A (zh) * | 2018-05-22 | 2018-08-17 | 张家港汉升机械科技有限公司 | 一种具有自润滑和防尘功能的轴承 |
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