WO2005120930A1 - 衝撃吸収式ステアリングコラム装置と電動式パワーステアリング装置 - Google Patents
衝撃吸収式ステアリングコラム装置と電動式パワーステアリング装置 Download PDFInfo
- Publication number
- WO2005120930A1 WO2005120930A1 PCT/JP2005/010618 JP2005010618W WO2005120930A1 WO 2005120930 A1 WO2005120930 A1 WO 2005120930A1 JP 2005010618 W JP2005010618 W JP 2005010618W WO 2005120930 A1 WO2005120930 A1 WO 2005120930A1
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- Prior art keywords
- column
- fitting
- fitting portions
- steering
- steering column
- Prior art date
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Classifications
-
- 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
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F7/00—Vibration-dampers; Shock-absorbers
- F16F7/12—Vibration-dampers; Shock-absorbers using plastic deformation of members
- F16F7/125—Units with a telescopic-like action as one member moves into, or out of a second member
-
- 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
Definitions
- the present invention relates to an impact-absorbing steering column device that contracts its entire length in the event of a collision to protect a driver colliding with a steering wheel, and an electric power steering device using the same.
- a transmission mechanism as shown in Fig. 14 is used to transmit the movement of a steering wheel to a steering gear.
- the steering wheel 2 is fixed to the rear end of the first steering shaft 1 (the right end in FIG. 14).
- the steering column 3 is fixed to the vehicle body on the lower surface of the instrument panel 6 and the like by the rear and front brackets 4 and 5.
- the first steering shaft 1 rotatably passes through the inside of the steering column 3.
- the portion of the front end of the first steering shaft 1 (the left end in FIG. 14) from which the opening force of the front end of the steering column 3 also protrudes is connected via the first universal joint 7 to the second steering shaft 8.
- the front end of the second steering shaft 8 is connected via a second universal joint 9 to a third steering shaft 10 communicating with a steering gear (not shown).
- the transmission mechanism of the vehicle steering system is configured as described above, the movement of the steering wheel 2 is controlled by the first steering shaft 1 and the first universal joint 7 passing through the steering column 3.
- the power is transmitted to the steering gear via the second steering shaft 8, the second universal joint 9, and the third steering shaft 10.
- the steering gear gives a wheel a steering angle corresponding to the movement of the steering wheel 2.
- a steering force assisting device called a power steering device is widely used.
- a small vehicle such as a mini vehicle, for example, as described in Patent Document 1 (JP-A-11-171029)
- an electric motor is used as a power source of a power steering device. Data is commonly used.
- FIG. 15 such an electric power steering apparatus includes a first steering shaft 1 for fixing a steering wheel 2 at a rear end, and a steering column 3 through which the first steering shaft 1 can pass.
- an electric motor 28 for applying a force in the rotation direction to the first steering shaft 1 when energized.
- the electric motor 28 applies an auxiliary torque to the first steering shaft 1 via a speed reducer 29 such as a worm speed reducer to reduce the steering force for rotating the steering wheel 2.
- a speed reducer 29 such as a worm speed reducer
- one end of the outer column 11 (left end in FIG. 14) and one end of the inner column 12 (left end in FIG. 14). (The right end in Fig. 14) in a telescope shape.
- the outer column 11 and the inner column 12 are relatively displaced in the axial direction, and the axial direction of the steering column 3 is changed.
- the dimensions are shrunk freely.
- the shock absorbing steering column device as described above has a structure in which a shock is absorbed by a contraction load (Collabs load) when the outer column 11 and the inner column 12 are relatively displaced. It is necessary that the load can be obtained stably.
- FIG. 16 shows a structure described in Patent Document 2 of the above-mentioned patent documents. As shown in FIG. 16, an inner column 12 is provided inside one end of an outer column 11 constituting the steering column 3. A portion where the outer column 11 and the inner column 12 overlap in the radial direction with one end inserted is referred to as an overlapping portion 13.
- the outer column 11 and the inner column 12 are connected to each other until a predetermined load is applied to the steering column 3. Is not relatively displaced I am doing it. Therefore, the magnitude of the load (that is, the Collabs load) required to relatively displace each of the outer column 11 and the inner column 12 depends on the fitting state of the fitting portion 14 constituting the overlapping portion 13 (for example, The size of the interference, the number and position of the fittings, etc.).
- FIG. 17 shows the relationship between the change in the interference of the fitting portion 14 and the Collabs load by the solid line in the case of (A) in FIG. 16 and the chain line in the cases of (B) to (D). Each is shown.
- the fitting portion 14 is provided at two locations in the circumferential direction. 16 (B) to 16 (D), which are arranged in the figure, when the interference of the fitting portion 14 is increased, the rate at which the Collabs load increases is higher.
- the increased interference of the fitting portions 14 in the vertical direction is hardly absorbed by the elastic deformation of the outer column 11, and is directly linked to the increase in the deformation resistance.
- FIGS. 16 (B) to 16 (D) in the case of a structure in which the number of fitting portions 14 is large and these fitting portions 14 are evenly arranged in the circumferential direction, as described above, However, since the change in the interference of each fitting portion 14 directly affects the deformation resistance, the Collabs load determined by the magnitude of the deformation resistance also affects the change in the interference of each fitting portion 14. Will be done.
- the fitting portion 14 exists only in the vertical direction in the figure, and does not exist in the horizontal direction. Therefore, even if the size of the interference of these fitting portions 14 is changed, the outer column 11 is directed to increase the vertical dimension in FIG. 16 (A). It is easy to bend. Therefore, even if this interference is larger than the desired value, the outer column 11 is bent in the direction of increasing the vertical dimension in FIG. It is easy to absorb the part that has become large. For this reason, the influence of the change in the interference of the fitting portions 14 on the above-mentioned deformation resistance is small, so that the change in the Collabs load due to the change in the interference can be suppressed.
- FIG. 16 (B) shows a case where a part of one end of the outer column 11 is square, and the plane forming the square and the outer peripheral surface of the inner column 12 are fitted together with a tight margin.
- this portion is referred to as the fitting portion 14.
- convex portions 15 projecting inward in the radial direction are formed on the inner peripheral surface of one end of the outer column 11, and these convex portions 15 have interferences on the outer peripheral surface of the inner column 12. In this state, the fitting is performed. Further, FIG.
- FIGS. 16 (B) to 16 (D) shows that, on the inner peripheral surface of one end of the outer column 11, convex portions 15 whose distal end surfaces are formed in a concave arc shape are formed, and the distal end surfaces of these convex portions 15 are The fitting portion 14 is fitted in a state where the fitting portion 14 has an interference.
- the number of the fitting portions 14 is the same, and the forces are different in shape.
- the shape of the fitting portion 14 is different, but the effect on the collapse load is almost the same as is apparent from FIG.
- the influence of the change in the interference on the Collabs load differs depending on the number and position of the fitting portions 14. Therefore, as in the case of employing the structure shown in FIGS. 16B to 16D, when the change in the interference of the fitting portion 14 has a large effect on the Collabs load, the outer column 11 Alternatively, if the interference of the fitting portions 14 slightly changes due to a slight dimensional error of the inner column 12, etc., the Collabs load may greatly fluctuate. On the other hand, in order to protect the driver in the event of a collision, it is necessary to stabilize the Collabs load and to reliably contract the steering column when a predetermined load is applied by the collision. On the other hand, if the Collabs load easily fluctuates as described above, there is a possibility that the steering column does not contract and the driver cannot be sufficiently protected even when the predetermined load is applied.
- the shock absorbing steering column device is used for the electric power steering device.
- the shock absorbing steering column device is used for the electric power steering device as described above, there are the following problems.
- the outer column 11 and the inner column 12 overlap the rear portion 13 (FIG. 14). (Right side), the rear bracket 4 for supporting the steering column 3 to the vehicle body is fixed and the position of the electric motor and reduction gear that constitute the electric power steering device is limited. .
- the position of the overlapping portion 13 can be arranged closer to the rear end (closer to the right end in FIG. 15). Even if the above-described electric motor 28 and the like are provided between the front bracket 5 and the front bracket 5, the distance between the overlapping portion 13 and the electric motor 28 and the like can be increased. As a result, the distance for contracting the steering column 3 can be secured.
- the superimposed portion 13 is deformed.
- the gap between the outer column 11 and the inner column 12 and the abutment between the peripheral surfaces of the two columns 11 and 12 may become unstable, and the bending rigidity of the steering column 3 may be reduced.
- the outer surfaces of both columns 11 and 12 are shaved to improve the accuracy of the outer column 11 and inner column 12, these columns 11
- the thickness of the 12 may be reduced. As described above, even when the thickness of each of the columns 11 and 12 is reduced, the bending rigidity of the steering column 3 is reduced. When the bending rigidity of the steering column 3 is low, the vibration force caused by running on a rough road or the like is transmitted to the S steering wheel 2, which causes discomfort to the driver.
- the steering column 3 as described above is required to contract smoothly during a collision and to increase rigidity for holding the steering wheel 2 during normal running. That is, the above-mentioned Collabs load can be obtained stably, and at the time of running or idling.
- the fitting state of the fitting part 14 between the outer column 11 and the inner column 12 that suppresses the vibration of the steering wheel 2 at the time of turning is strong against the bending force in the vertical direction in the mounting state (high rigidity) Is required.
- the tightening margin of each of the fitting portions 14 is increased to increase the fitting strength. It is necessary to lengthen the fitting length.
- the steering column 3 is installed in an attached state in a state of being tilted up and down as shown in FIGS. Therefore, at the time of collision, the steering wheel 2 contracts while an upward bending force acts on the steering wheel 2. Therefore, if the strength (bending rigidity) against the bending force in the upward direction is not sufficient, the steering column 3 contracts while being subjected to the bending force at the time of a collision, at the fitting portions 14 at the time of collision. May not be performed stably (smoothly).
- the thickness of the outer column 11 and the inner column 12 is increased in order to secure the strength of the fitting portion 14 against bending without securing the axial dimension of the steering column 3. Things are possible.
- the change in the Collabs load becomes sensitive to the change in the tightening margin of the fitting portion 14. That is, when the thickness of each of the columns 11 and 12 is increased, it is difficult for the columns 11 and 12 to elastically deform in response to the change in the interference, thereby absorbing the change in the interference. For this reason, the change in the collabs load becomes sensitive to the change in the interference, and an appropriate collabs load is obtained.
- the inner peripheral surface of the outer column 11 or the outer peripheral surface of the inner column 12 for improving the strength of the steering column 3 against the bending force and stabilizing the Collabs load are both treated with metal stone.
- a technique for performing a low friction surface treatment such as the above is known. That is, if surface treatment is performed on any one of these peripheral surfaces to reduce the friction between these peripheral surfaces, the fitting strength of the fitting portion 14 can be increased or the fitting length can be reduced. Even if it is made longer, the increase in the Collabs load can be suppressed.
- the surface treatment is performed as described above, the manufacturing cost of the shock absorbing steering column apparatus increases.
- fitting portions 14 are arranged at equal intervals in the circumferential direction, and each of these fitting portions 14 is provided at four or more locations (in the illustrated example).
- (8) sufficient strength against bending force cannot be secured and vibration may not be sufficiently prevented for the following reasons. That is, if the number of the fitting portions 14 is large, the roundness of the inner column 12 (or the outer column 11 when the inner column 12 is deformed and fitted to the outer column 11) is poor, There is a difference in the contact state (the contact strength) of each of the fitting portions 14, and it is difficult to secure the strength against the bending force. If the roundness between the outer column 11 and the inner column 12 is improved, such a problem does not occur. The manufacturing cost also increases.
- Patent Document 1 JP-A-11-171029
- Patent Document 2 JP-A-63-255171
- Patent Document 3 Japanese Patent Publication No. 8-5095
- Patent Document 4 JP-A-8-142885
- Patent Document 5 Japanese Utility Model Laid-Open No. 6-65149
- Patent Document 6 Japanese Utility Model Laid-Open No. 1 145771
- Patent Document 7 Japanese Utility Model Laid-Open No. 1 145770
- Patent Document 8 Japanese Utility Model Application Laid-Open No. 63-192181
- Patent Document 9 Japanese Utility Model Publication No. 62-6074
- Patent Document 10 Japanese Patent Application Laid-Open No. 2004-130849
- the shock absorbing steering column device and the electric power steering device of the present invention can stabilize the Collabs load, which has a high degree of freedom in design, and can secure bending rigidity. It was invented to obtain the structure at low cost.
- the shock absorbing steering column device and the electric power steering device of the present invention have a structure capable of stabilizing the Collabs load regardless of the interference of the fitting portion. It was invented to obtain it at low cost.
- the shock absorbing steering column device and the electric power steering device of the present invention can reduce the Collabs load regardless of the error (change) in the interference of the fitting portion.
- the present invention was invented to obtain a structure that can stabilize and secure the strength against bending force (bending rigidity) at low cost.
- shock absorbing steering column device and the electric power steering device of the present invention
- the shock absorbing type steering column device includes an outer column and an inner column.
- the outer column is fixed to the bracket, which is supported on the vehicle body via a bracket, by a part of the axial direction by welding.
- one end of the inner column is inserted inside one end of the outer column.
- the outer column and the inner column are fastened to a part in a circumferential direction of an overlapping portion where the outer column and the inner column overlap in the radial direction.
- a fitting part having a margin is provided.
- the position of the bracket is made to coincide with the overlapping portion in the axial direction, and the welding portion between the bracket and the outer column is a position in the overlapping portion where the force of the fitting portion is also removed.
- the outer column and the inner column are provided at a plurality of circumferentially overlapping portions where the outer column and the inner column overlap in the radial direction.
- a fitting portion having an interference is provided.
- each of these fitting portions is Assuming that is divided into two in the diameter direction, it exists in a state where it is biased to a position away from this divided part (the part where the fitting part becomes discontinuous due to the division).
- the position of the bracket is made to coincide with the overlapping portion with respect to the axial direction, and the welding portion between the bracket and the outer column is located on one side of the overlapping portion assuming that the overlapping portion is divided.
- the outer column and the inner column are provided at a plurality of circumferentially overlapping portions where the outer column and the inner column overlap in the radial direction. And fitting portions having interferences are provided, and these fitting portions are arranged unevenly in the circumferential direction.
- one end of the outer column and one end of the inner column overlap one other in a radial direction.
- a plurality of fitting portions each having an interference are provided at a plurality of positions at equal intervals in the circumferential direction.
- one of the fitting portions located in the up-down direction or in the vicinity of the up-down direction when mounted on the vehicle.
- the interference is set larger than the interference of the other fitting parts.
- the fitting portion located in the up-down direction or in the vicinity of the up-down direction when mounted on the vehicle.
- the area is larger than the area of the other fitting parts.
- the vicinity in the up-down direction means that the center position of the fitting portion is present within a range of 10 ° or less on both sides in the circumferential direction from the up-down direction (a total range of 20 °). .
- one end of the outer column and one end of the inner column overlap one another in a radial direction.
- a plurality of fitting portions each having an interference are provided at a plurality of positions located at equal intervals in the circumferential direction. And of these fitting portions, the area of the fitting portion located at the portion where the bending force acts upon collision is made larger than the area of the other fitting portions.
- the electric power steering apparatus of the present invention includes a steering shaft for fixing a steering wheel to a rear end, a steering column that allows the steering shaft to pass through, and a rotation direction of the steering shaft when energized. And an electric motor for applying the force.
- the steering column of each of the above embodiments is used as the above-described shock absorbing steering column device.
- the flexibility of design is high, so that the Collabs load can be stabilized and the bending rigidity can be ensured.
- the structure can be obtained at low cost.
- the Collabs load can be stabilized, it is possible to realize a high-safety shock-absorbing steering column device that facilitates optimal setting of energy absorption at the time of collision.
- a structure capable of stabilizing the Collabs load can be obtained at low cost regardless of a change in the interference of the fitting portion. . That is, by making the arrangement of the fitting portions uneven, it is possible to reduce the influence of the change in the interference of these fitting portions on the Collabs load. In other words, the change in the Collabs load with respect to the change in the interference of each of these fitting portions becomes insensitive. As a result, a stable Collabs load can be obtained without improving the accuracy of the interference of these fitting portions. In this way, if the Collabs load can be stabilized without improving the accuracy of the interference of the fitting part, a highly-safe shock-absorbing steering column that facilitates optimal setting of energy absorption in the event of a collision. The device can be obtained at low cost.
- the Collabs load can be stabilized irrespective of the change in the interference of the fitting portion, and the strength against bending force can be improved. It is possible to obtain a structure that can secure the flexural rigidity (bending rigidity) at low cost. That is, of each fitting part, the interference or the area of the fitting part located in the vertical direction or in the vicinity of the vertical direction is larger or wider than the interference or the area of the other fitting parts. Each of these fittings The influence of the change in the interference on the Collabs load can be reduced.
- the interference or area of the above-mentioned other fitting parts is small or narrow, the error (change) of the interference can be absorbed by this other fitting part.
- the change in the Collabs load to the change in interference becomes less sensitive.
- a stable Collabs load can be obtained without increasing the precision of the interference of these fitting portions.
- the interference or the area of the fitting portion located in the vertical direction or in the vicinity of the vertical direction is increased or increased, the strength against the bending force in the vertical direction can be secured. In this way, it is possible to stabilize the Collabs load without improving the accuracy of the interference of the fitting portion, and if the strength against the bending force in the vertical direction can be secured, it is easy to set the energy absorption at the time of collision optimally.
- the area of the fitting portion located at the portion where the bending force is applied at the time of collision is changed. Since the area of the fitting portion is larger than that of the fitting portion, the influence of the change in the interference of each fitting portion on the Collabs load can be reduced. In addition, the steering column is twisted due to the bending force acting upon the collision, and the contraction of the steering column can be performed stably (smoothly).
- shock absorbing steering column device of the present invention having the above-described effects is incorporated into an electric power steering device, the degree of freedom in design can be improved, such as the welding position of the bracket can be freely determined. In addition, a highly safe electric power steering device can be obtained at low cost.
- FIG. 1 is a view similar to FIG. 16, but showing a first embodiment of the present invention.
- FIG. 2 is a sectional view taken along line AA of FIG. 1.
- FIG. 3 is a view similar to FIG. 1, showing another shape of the bracket.
- FIG. 4 is a view showing another example of a welding method of the bracket and the outer column, also showing the lateral force in FIG.
- FIG. 5 is a view similar to FIG. 1, but showing Example 2 of the present invention.
- FIG. 6 is a sectional view taken along line BB of FIG. 5.
- FIG. 7 is a view similar to FIG. 1, but showing a third embodiment of the present invention.
- FIG. 8 is a sectional view taken along the line CC of FIG. 7.
- FIG. 9 is a view similar to FIG. 1, but showing Example 4 of the present invention.
- FIG. 10 is a sectional view taken along the line DD of FIG.
- FIG. 11 is a view similar to FIG. 1, but showing Example 5 of the present invention.
- FIG. 12 is a sectional view taken along line EE of FIG.
- FIG. 13 is a view similar to FIG. 1, but showing Example 6 of the present invention.
- FIG. 14 is a side view showing an example of a steering mechanism to which the present invention is applied.
- FIG. 15 is a side view showing an example of an electric power steering mechanism to which the present invention is applied.
- FIG. 16 is a view corresponding to a cross section taken along line FF of FIG. 14, showing four examples of a conventional structure of a superposed portion of an outer column and an inner column.
- FIG. 17 is a diagram showing a relationship between a change in interference of a fitting portion and a Collabs load.
- FIG. 18 is a view similar to FIG. 16, but showing Example 8 of the present invention.
- FIG. 19 is a sectional view taken along line HH of FIG.
- FIG. 20 is a view similar to FIG. 16, but showing Example 9 of the present invention.
- FIG. 21 shows Embodiment 10 of the present invention.
- FIG. 21 (A) is a view corresponding to the FF section of FIG. 19, and
- FIG. 21 (B) is a view corresponding to the GG section of FIG.
- FIG. 22 is a view similar to FIG. 19 but showing Embodiment 11 of the present invention.
- FIG. 23 is a view similar to FIG. 16, but showing another example of the conventional structure of the overlapping portion of the outer column and the inner column.
- FIG. 24 is a view similar to FIG. 16, but showing Example 12 of the present invention.
- FIG. 25 is a view similar to FIG. 16, but showing Example 13 as well.
- FIG. 26 is a view similar to FIG. 16, but showing Example 14 in the same manner.
- FIG. 27 is a view similar to FIG. 16, but showing Example 15 in the same manner.
- FIG. 28 is a view similar to FIG. 16, showing Example 16 similarly.
- FIG. 29 is a partial longitudinal sectional view of an outer column showing Example 17 in the same manner.
- FIG. 30 is a view corresponding to a cross section taken along line JJ of FIG. 24, showing Example 18 in the same manner.
- FIG. 31 is a sectional view taken along the line KK of FIG. 30.
- FIG. 32 is a sectional view taken along line LL of FIG. 30.
- the welding portion between the bracket and the outer column be the most distant in the circumferential direction from the fitting portion cap of the overlapping portion. Position.
- fitting portions having interferences at a plurality of positions in the circumferential direction are provided in a superimposed portion where the outer column and the inner column overlap in the radial direction. Assuming that it is divided into two parts in the diameter direction, it exists in a state that is biased at a position distant from the divided part. Then, the welding portion between the bracket and the outer column is set near the fitting portion existing on one side of the assumption that the overlapping portion is divided.
- each of these fitting portions is provided at two locations in the circumferential direction in the portion where the fitting portion exists in the axial direction of the overlapping portion.
- the fitting portions are arranged symmetrically with respect to the center axis of the outer column.
- each fitting portion is present in a state where it is biased at a position distant from the divided portion, assuming that the overlapping portion is divided into two in the diameter direction.
- each fitting portion is unequally present in the circumferential direction.
- At least one of the outer column and the inner column is subjected to a finishing treatment on its surface, and the original tube is left as it is.
- the manufacturing cost can be reduced.
- the outer column or the inner column can be kept as it is because in the case of the present invention, it is necessary to form the outer column and the inner column with high precision in order to stabilize the Collabs load. Because there is no.
- each fitting portion is made uneven.
- the arrangement of the fitting portions is deviated vertically in the mounted state.
- the interference of the fitting portion arranged at a position deviated in the up-down direction in the mounted state is changed to the tightening allowance of the fitting portion arranged at another position. Larger than the teens.
- the strength against vertical bending in the mounted state can be increased, and vibration of the steering wheel during traveling or the like can be prevented. That is, when the shock absorbing steering column device is mounted on an automobile, it is necessary to secure a sufficient strength against a vertical bending force in order to prevent the steering wheel from vibrating.
- the arrangement of the fitting portions is deviated in the vertical direction, or the interference of the fitting portions disposed in the vertically deviated position is increased, thereby increasing the interference.
- the steering column will be twisted in the event of a collision, and the steering column can be stably (smoothly) contracted.
- an impact-absorbing steering column device of the present invention is applied to an electric power steering column device in which it is difficult to secure the axial dimension of the steering column, it is necessary to secure strength against bending. Since the axial length of the overlapping portion can be shortened without increasing the axial length of the fitting portion, the Collabs stroke can be easily secured. It should be noted that by increasing the thickness of the outer column and the inner column constituting the steering column, the strength against bending force can be increased. Even in this case, since the change in the Collabs load with respect to the interference of the fitting portion is insensitive, the Collabs load can be stabilized regardless of the change in the interference of each of the fitting portions.
- fittings which are unequally arranged in the circumferential direction are provided at positions axially separated from each other in the overlapping portion of the outer column and the inner column. There is a joint portion, and the number of fitting portions on which a bending force acts upon a collision is made larger than the number of other fitting portions.
- the area of the fitting portion where the bending force acts upon collision is made larger than the area of the other fitting portions.
- the axial length of the fitting portion on which the bending force acts at the time of collision may be larger than the axial length of the other fitting portions. That is, by increasing the axial length of the fitting portion, the area of the fitting portion can be increased.
- each fitting portion is formed with projections at a plurality of positions in the circumferential direction of one of the outer column and the inner column.
- a spacer made of a low-friction material is arranged between the inner peripheral surface of the outer column and the outer peripheral surface of the inner column, and each fitting portion fits through the spacer. You may do it.
- a low-friction surface treatment may be applied to at least one of the inner peripheral surface of the outer column and the outer peripheral surface of the inner column that is fitted to the other peripheral surface.
- the axial length or circumference of the fitting portion located in the up-down direction or near the up-down direction in the state of attachment to the vehicle is required.
- the length in the direction is made larger than the length in the axial direction or the length in the circumferential direction of the other fitting portion.
- the fitting margin or area (length in the axial direction or circumferential length) of the fitting portion located in the vertical direction or in the vicinity of the vertical direction in the state of attachment to the vehicle is determined.
- the area of the fitting portion located at the portion where the bending force acts upon collision is increased.
- the interference of the fitting portion located in the vertical direction is increased, and the fitting margin of the fitting portion located in the upward and downward direction is increased.
- the area of the fitting portion located at the portion where the bending force acts upon the collision is increased.
- the axial length or circumferential length of the fitting portion located at the portion where the bending force acts upon collision is increased. You may. That is, by increasing the axial length or circumferential length of the fitting portion, the area of the fitting portion can be increased.
- each fitting portion is provided with a plurality of diameters at a plurality of positions in the circumferential direction of one of the outer column and the inner column.
- the projections (projections) projecting in the direction may be formed, and these projections may be fitted to the other member in a state having an interference.
- a spacer made of a low friction material is arranged between the inner peripheral surface of the outer column and the outer peripheral surface of the inner column, and each fitting portion is fitted through the spacer. You may do it.
- a low friction surface treatment may be applied to at least one of the inner peripheral surface of the outer column and the outer peripheral surface of the inner column that is fitted to the other peripheral surface.
- FIGS. 1 and 2 show a first embodiment of the present invention.
- the feature of the present invention is that the position of the bracket 16 that enhances the degree of design freedom is determined by the overlapping portion 13 where the outer column 11 and the inner column 12 overlap in the radial direction, and the axial direction (the front and back direction in FIG. 1). (Left and right directions in FIG. 2), the position of the welded portion between the bracket 16 and the outer column 11 to stabilize the Collabs load and the fitting portion 14 existing in the overlapping portion 13 The point is to regulate the relationship.
- the other structure is the same as the above-described conventional structure, and therefore, the duplicate description will be omitted or simplified, and the following description will focus on features of the present invention.
- the outer column 11 and the inner column 12, which constitute the steering column 3 that rotatably supports a steering shaft (not shown) on the inner diameter side, are subjected to finishing or drawing on the surface.
- the unwelded ERW tube (original tube) remains.
- two ends of the outer column 11 (left end in FIG. 2) separated from each other in the axial direction are left as they are.
- An elliptical portion 17 having a substantially elliptical cross section is formed by press working or the like.
- the elliptical portion 17 may be provided at two or more locations in the axial direction, or the elliptical portion 17 may be provided as one location and elongated in the axial direction.
- the elliptical portion 17 is provided apart from the axial direction or the elliptical portion 17 is lengthened in the axial direction, as described below, one end (the right end in FIG. 2) of the inner column 12 and the above-mentioned key are used. ⁇ ⁇ When the one end of the outer column 11 is fitted, the bending rigidity of the steering column 3 constituted by the inner column 12 and the outer column 11 can be easily secured.
- the outer peripheral shape of one end of the inner column 12 is a cylindrical surface.
- the outer diameter of one end of the inner column 12 is smaller than the length of the major diameter portion of the inner peripheral surface of the elliptical portion 17, but is greater than the length of the minor diameter portion.
- the outer column 11 and the inner column 12 are inserted into one end of the outer column 11 by inserting one end of the inner column 12 so that one end of the outer column 11 and the inner column 12 are inserted.
- the one end portion is overlapped in the radial direction to form the overlapping portion 13. Therefore, in this state, the short-diameter portion of the elliptical portion 17 formed at one end of the outer column 11 is fitted to the outer peripheral surface of one end of the inner column 12 with an interference. .
- each of the fitting portions 14 is formed on the outer peripheral surface of the inner column 12.
- the curvature of the abutment to be brought into contact with a large area is slightly different from other parts.
- the fitting portions 14 present in the respective elliptical portions 17 are arranged so as to be symmetric with respect to the center axis of the outer column 11. In the case of the present embodiment, since the elliptical portion 17 of the outer column 11 has a shape that is crushed in the vertical direction in FIGS. It does not exist in the horizontal direction of Fig. 1 (the front and back direction in Fig. 2).
- the position of the bracket 16 fixed to the vehicle body (not shown) is made coincident with the above-mentioned superimposed portion 13 in the axial direction. Then, a welding portion between the bracket 16 and the outer column 11 is set as a position which is circumferentially deviated from each of the fitting portions 14. That is, the bracket 16 includes a support plate portion 18 disposed in the left-right direction (the left-right direction in FIG. 1 and the front-back direction in FIG. 2) of the outer column 11, and a connection portion 19 connecting the support plate portions 18 to each other. And a bent portion 20 for connecting the support plate portion 18 and the connecting portion 19 to each other. A mounting plate portion (not shown) provided on the opposite side (upper side in FIGS.
- the support plate portion 18 to the connecting portion 19 is supported by the vehicle body. Further, at the position where the bent portion 20 is displaced in the circumferential direction from each of the fitting portions 14, the minor-diameter portion force of the elliptical portion 17 where these fitting portions 14 exist is also the major-diameter portion where the farthest away.
- the bending force S bent portion 20 and the outer peripheral surface of the long diameter portion are fixed by welding. Therefore, in the case of the present embodiment, as shown in FIG. 2, the welding portions of the bracket 16 and the outer column 11 are provided at two portions on the left and right sides of FIG. Each exists.
- the connecting portion 19 is disposed so as to straddle the outer peripheral surface of the outer column 11 by curving upward in FIGS.
- the connecting portion 19 may be arranged below the outer column 11.
- the intermediate portion of the support plate portion 18 and the outer peripheral surface of the long diameter portion of the elliptical portion 17 are welded, or as shown in FIG. 4, a window hole 30 is formed in the support plate portion 18, Of the peripheral edge of the window hole 30, the upper edge and the outer peripheral surface of the long diameter portion may be welded.
- the fitting portion 14 may be provided in the left-right direction in FIGS. 1 and 3 and the bracket 16 and the outer column 11 may be welded in the up-down direction in FIGS.
- the assembling work of the shock absorbing type steering column device of the present embodiment is preferably performed in the following steps. First, the elliptical portion 17 is formed at one end of the outer column 11. Next, the bracket 16 is fixed to one end of the outer column 11 by welding at a major diameter portion of the elliptical portion 17. Then, as described above, one end of the inner column 12 is inserted inside one end of the outer column 11 to which the bracket 16 is fixed, and the inner peripheral surface of the minor diameter portion of the elliptical portion 17 and the inner surface The impact absorbing steering column device is formed by fitting (abutting with a margin) to one end portion outer peripheral surface of the column 12.
- the welding portion between the bracket 16 and the outer column 11 is located at a position deviated from the fitting portion 14 having the interference of the overlapping portion 13, deformation due to welding may be caused by these fitting portions.
- the influence on the joint 14 can be reduced, and the Collabs load of the steering column 3 can be stabilized.
- the portion where the bracket 16 and the outer column 11 are welded is the position of the overlapping portion 13 that is the most distant from the respective fitting portions 14 in the circumferential direction. Since the elliptical portion 17 has a long diameter, the influence of the deformation due to welding on each of the fitting portions 14 can be minimized, and the fluctuation of the collapse load can be further reduced.
- the outer column 11 and the inner column 12 are fitted to each other by forming the elliptical portion 17 at one axial end of one end of the outer column 11.
- the elliptical portion 17 has only two fitting portions 14 in the circumferential direction. Therefore, similarly to the structure shown in FIG. 16 (A) described above, as shown by the solid line (A) in FIG. 17 described above, the influence of the change in the interference of these fitting portions 14 on the Collabs load is small. . Therefore, even if the interference of these fitting portions 14 changes, the fluctuation of the Collabs load can be suppressed low. If the Collabs load can be stabilized in this way, a highly safe shock-absorbing steering column system that can easily set the optimal energy absorption in the event of a collision Can be realized.
- the elliptical portion 17 can be formed with high precision, or the outer portion can be formed.
- the Collabs load can be stabilized without improving the accuracy of the column 11 and the inner column 12. For this reason, it is not necessary to perform surface treatment or the like on the raw tubes used for these columns 11 and 12. Further, it is not necessary to provide a spacer ball at the overlapping portion 13 between the outer column 11 and the inner column 12. Therefore, it is possible to suppress an increase in manufacturing cost in order to stabilize the Collabs load. As a result, a shock absorbing steering column device with a stable Collabs load can be obtained at low cost.
- the bending rigidity of the steering column 3 it is easy to secure the bending rigidity of the steering column 3. That is, as described above, if the deformation due to welding has little effect on the fitting portion 14, the gap between the outer column 11 and the inner column 12 and the peripheral surfaces of these two columns 11, 12 are formed by welding. The contact state becomes unstable, and a decrease in bending rigidity can be suppressed. In addition, since it is not necessary to increase the accuracy of the outer column 11 and the inner column 12 in order to stabilize the Collabs load, the thickness of each of the columns 11 and 12 can be increased, and the bending rigidity is improved. Can do things. In this way, if the bending rigidity of the steering column 3 can be secured, the transmission of vibration to the steering wheel 2 (see Figs. 14 and 15) due to running on rough roads, etc. can be suppressed. You can get it.
- Figs. 5 and 6 show a second embodiment of the present invention.
- the welded portion between the bracket 16 and the filter column 11 is positioned near the upper fitting portion 14 in FIGS. 5 to 6 of the overlapping portion 13 of the outer column 11 and the inner column 12.
- elliptical portions 17 are formed at two axially separated portions of one end (the right end in FIG. 6) of the outer column 11. I have. Then, with one end (the left end in FIG.
- these fitting portions 14 exist in the vertical direction (the vertical direction in FIGS. 5 and 6), but do not exist in the horizontal direction (the left and right directions in FIG. 5 and the front and back directions in FIG. 6). .
- the fitting portions 14 are present in a state of being biased in the upper and lower portions, which are the farthest positions from the divided partial portion. are doing.
- welding portions between the bracket 16 and the outer column 11 are present on both sides of the upper fitting portion 14 in the circumferential direction of the outer column 11.
- the bracket 16 has a shape of the connecting portion 19 connecting the support plate portions 18 on the left and right sides, which is present in the minor diameter portion of the elliptical portion 17 of the outer column 11. It has a shape with a radius of curvature that is almost the same as the radius of curvature of the portion where the curvature is slightly different from other portions.
- the width in the left-right direction of the connecting portion 19 having such a shape is slightly larger than the width of the fitting portion 14 existing on the upper side.
- the support plate 18 is inclined toward the center of the outer column 11 from the intermediate portion to the lower end, and the lower end is interposed between the left and right ends of the connecting portion 19 and the bent portion 20. It is continuous. Therefore, these bent portions 20 are located on both sides of the upper fitting portion 14. Then, the outer column 11 and the bracket 16 are fixed by welding each of the bent portions 20 and both sides of the upper fitting portion 14.
- each of the fitting portions 14 exists only in the vertical direction and does not exist in the horizontal direction. Joint It becomes easier to bend in the direction in which the diameter changes in the direction in which 14 exists (vertical direction). Therefore, as in the present embodiment, when welding is performed in the vicinity of the fitting portion 14 located above the overlapping portion 13, the deformation generated during this welding is easily absorbed by the vertical radius. The effect on these fitting portions 14 can be kept low. In addition, since the welding portion 14 located on the lower side of these fitting portions 14 is not easily deformed by welding, the inner circumference of the outer column 11 at the lower fitting portion 14 The engagement between the surface and the outer peripheral surface of the inner column 12 is hard to change. As a result, even if welding is performed in the vicinity of the upper fitting portion 14, fluctuation of the Collabs load can be suppressed.
- the fitting portion 14 on the welding side may be the lower fitting portion 14. That is, the connecting portion 19 of the bracket 16 is welded to the vicinity of the lower fitting portion 14 and not to the upper fitting portion 14.
- the direction in which the overlapping portion 13 is tentatively divided may be a vertical direction, and the fitting portion 14 may be provided in the horizontal direction.
- the welding portion between the bracket 16 and the outer column 11 is near one of the fitting portions 14 of the fitting portions 14 existing on the left and right sides. Even with such a structure, it is possible to suppress the fluctuation of the Collabs load due to welding as in the case described above.
- Other structures and operations are the same as those in the first embodiment.
- Figs. 7 and 8 show a third embodiment of the present invention.
- the welding portion between the bracket 16 and the filter column 11 is moved from the upper fitting portion 14 of FIGS. 7 to 8 of the overlapping portion 13 of the outer column 11 and the inner column 12 to the shaft.
- the shape of the connecting portion 19 connecting the support plate portions 18 of the bracket 16 to each other is the same as that of the one end of the outer column 11 except for the elliptical portion 17 (same as the original tube). (Part of the shape) has a radius of curvature that is almost the same as the radius of curvature of the outer peripheral surface.
- the connecting portion 19 is One end (the left end in FIG. 8) of the connecting portion 19 and the portion between the elliptical portions 17 above the outer column 11 are fixed by welding.
- the other end of the connecting portion 19 (right end in FIG. 8) is fixed by welding to a position above the outer column 11 and behind the overlapping portion 13 (right side in FIG. 2). ing.
- the welding portion between the bracket 16 and the outer column 11 has the fitting portions 14 existing in the overlapping portion 13. Of these, it exists near the upper fitting portion 14 and does not exist on the lower fitting portion 14 side. Therefore, the lower fitting portion 14 is hardly affected by welding. Also in the case of the present embodiment, since there are two fitting portions 14 present in one elliptical portion 17, the influence of the change of the interference of these fitting portions 14 on the Collabs load is not significant. small. For this reason, also in the case of the structure of the present embodiment, it is possible to suppress the fluctuation of the Collabs load due to welding. Other structures and operations are the same as those in the second embodiment.
- FIG. 9-: LO indicates Example 4 of the present invention.
- a part of the welding portion between the bracket 16 and the filter column 11 is partially replaced with a part of the fitting portion 14 existing in the overlapping portion 13 of the outer column 11 and the inner column 12. It is on the fitting part 14. That is, in the case of the present embodiment, the bracket 16 is formed in an angular U-shape, and the lower end of the support plate 18 is welded to the outer peripheral surface of the outer column 11, respectively.
- One of the support plate portions 18 (left side in FIG. 10) is welded onto the fitting portion 14 above one of the elliptical portions 17 of the elliptical portions 17 formed on the overlapping portion 13. .
- the other (right side in FIG.
- support plate portion 18 is welded to the outer peripheral surface of the outer column 11 at a position separated from the overlapping portion 13.
- the lower end edge of each support plate portion 18 that is to be welded to the outer peripheral surface of the outer column 11 is separated from the outer peripheral surface of the fitting portion 14 or the overlapping portion 13 of the outer column 11.
- a notch is formed in an arc shape in a shape similar to the shape of each of the outer peripheral surfaces of the bent portions. For this reason, by welding this portion in a state where the notched portions are in contact with the corresponding outer peripheral surfaces, it is possible to secure this welded portion that is long in the circumferential direction of the outer column 11.
- the one support plate 18 is connected to the one ellipse. Since welding is performed on the upper fitting portion 14 of the circular portion 17, the upper fitting portion 14 may be deformed by welding, and the interference of the upper fitting portion 14 may be changed. However, also in the case of the present embodiment, since there are only two fitting portions 14 in one elliptical portion 17, even if the interference of the upper fitting portion 14 changes, the load on the Collabs load is reduced. Has little effect. Further, since the welding portion between the fitting portion 14 and the support plate portion 18 exists only above the elliptical portion 17, the lower fitting portion 14 is welded to form the outer column 11 and the inner column 12 by welding. The engagement state of and does not change. For this reason, the variation of the Collabs load can be suppressed to some extent, though not as much as in the above-described embodiments. Other structures and operations are the same as those of the second embodiment.
- FIG. 11 and FIG. 12 show a fifth embodiment of the present invention.
- two deformed portions 21 each having a radially inwardly projecting convex portion 15 are provided at two axially spaced locations at one end (the left end in FIG. 12) of the outer column 11.
- Each of the projections 15 provided on each of the deformed portions 21 is formed at four locations in the circumferential direction for each of the deformed portions 21.
- the shape of each of the projections 15 may be any of the shapes shown in FIGS. 16C and 16D, but in the case of this embodiment, (C ) Have the same shape as the projection 15 shown in FIG. That is, the shape of the tip surface of the convex portion 15 is a convex arc shape.
- the arrangement of the respective protrusions 15 in the circumferential direction is in a state of being biased upward and downward in the outer column 11. That is, assuming that the overlapping portion 13 of the outer column 11 and the inner column 12 is divided into two by a horizontal dividing line N (corresponding to a virtual line in the dividing direction), as shown in FIG.
- the angle ⁇ formed by each of the dividing line N and each of the convex portions 15 and the angle ⁇ formed by each of the vertical imaginary line M orthogonal to the dividing line N and each of the convex portions 15 ⁇ And the size is different.
- the angle ⁇ is
- each of the convex portions 15 is
- the dividing line N force is also provided in a state biased to a distant position.
- these convex portions 15 are unevenly arranged in the circumferential direction of the outer column 11.
- the outer column 11 is easy to bend in the direction in which the cross-sectional shape extends in the up-down direction.
- one end of the inner column 12 (FIG. 12) is provided inside one end of the outer column 11. (The right end of the inner column 12) is inserted, and each of the projections 15 and the outer peripheral surface of the inner column 12 are fitted together with a tightening margin.
- each of the deformed portions 21 has four of the fitting portions 14. Exist one by one. Further, these fitting portions 14 are unequally arranged in the circumferential direction of the overlapping portion 13, specifically, the gaps in the circumferential direction of the fitting portions 14 existing across the virtual line M are different.
- the overlapping portions 13 are arranged so as to be smaller than the interval between the fitting portions 14 existing in the circumferential direction with the dividing line N interposed therebetween, and are biased in the vertical direction of the overlapping portion 13.
- the welding portion between the outer column 11 and the bracket 16 is located near the upper fitting portion 14 of the outer peripheral surface of the outer column 11. That is, the bent portion 20 forming the bracket 16 is fixed to the outer peripheral surface of the outer column 11 by welding at a position displaced in the circumferential direction from each of the convex portions 15.
- the welding portion is located closer to the above-mentioned left-right division line N side than each of the projections 15. However, this welding location may be near the imaginary line M in the vertical direction. In short, it is only necessary that the welding portion be located at a position shifted from the above-mentioned respective convex portions 15 in the circumferential direction.
- the welding location is set in the axial direction (the horizontal direction in FIG. 12) with respect to each of the deformed portions 21. It is shifted to. That is, the welded portion is located between the deformed portions 21 and in front of the deformed portions 21 in the axial direction (left side in FIG. 12) or rearward (right side in FIG. 12). Further, in the present embodiment, this welding location exists only in the upper portion of the outer column 11 and does not exist in the lower portion.
- FIG. 13 shows a sixth embodiment of the present invention.
- convex portions 15 are formed at three circumferential positions of one deformed portion 21 of the outer column 11, respectively. Therefore, when one end of the inner column 12 is inserted inside one end of the outer column 11, there are three fitting portions 14 for each of the deformed portions 21.
- Each of these fitting portions 14 is provided at two locations on the upper side and one location on the lower side of the overlapping portion 13 of the outer column 11 and the inner column 12. Further, the circumferential distance of each of the fitting portions 14 is an angle formed by the lower fitting portion 14 and the upper fitting portion 14, and
- the angle 0 must be greater than the angle 0 between the upper fittings 14 (0> ⁇ ).
- the lower fitting portion 14 exists on the virtual line M.
- two of the three fitting portions 14 are provided on the upper side of FIG. 13 with the virtual line M interposed therebetween, and the other one is provided on the lower side of FIG. It is provided on M.
- the space between the two fitting portions 14 in the circumferential direction is larger than the space between the two fitting portions 14 and the other fitting portion 14 in the circumferential direction. I'm making it smaller.
- the bracket 16 is welded to the upper side of the outer column 11 by welding. It is fixed. Further, the welding location is a position shifted in the circumferential direction and the axial direction from the upper fitting portion 14.
- the number of the fitting portions 14 is all three at one deformed portion 21, the influence of the change in the interference of these fitting portions 14 on the Collabs load is as follows.
- the basic structure and operation are the same as those of the fifth embodiment.
- Example 7 is Example 7 of the present invention.
- an electric power steering device having high design flexibility and high safety is provided. Can be obtained at low cost. That is, the structure of this embodiment is almost the same as the structure shown in FIG.
- the steering column 3 (see FIG. 15) is replaced with the shock absorbing steering column having any of the structures of the above-described embodiments. As a device.
- the position of the rear bracket 4 (corresponding to the bracket 16 shown in Figs. 1 to 13) constitutes the steering column 3. Since the position is the same as the position of the overlapping portion 13 between the outer column 11 and the inner column 12, the degree of freedom in designing the electric motor 28 and the reduction gear 29 can be increased. Further, as described above, even if the position of the rear bracket 4 is at the same position as the overlapping portion 13, the fluctuation of the Collabs load can be suppressed, so that safety can be secured.
- the structure of the electric power steering column device for example, as described in Patent Documents 1 and 4 described above, since conventional power is also known, detailed description is omitted.
- FIGS. 18 to 19 show an eighth embodiment of the present invention.
- the feature of the present invention is to stabilize the Collabs load regardless of a change in the tightening margin of the fitting portion 14 existing in the overlapping portion 13 in which the outer column 11 and the inner column 12 overlap in the radial direction.
- the arrangement of these fitting portions 14 must be devised so as to ensure the strength (rigidity) against the bending force in the vertical direction in the mounted state. Since the structure and operation of the other parts are the same as those of the conventional structure described above, overlapping drawings and explanations are omitted or simplified, and The following mainly describes features of the present embodiment.
- a steering column 3 that rotatably supports a steering shaft (not shown) on the inner diameter side, is axially separated from one end (left end in FIG. 19) of the outer column 2.
- a deformed portion 21 having a projection 15 projecting radially inward is provided at each location.
- Each of the projections 15 provided on each of the deformed portions 21 is formed at four locations in the circumferential direction for one deformed portion 21.
- the shape of each of the projections 15 may be any of the shapes of the projections 15 shown in FIGS. 16 (C) and 16 (D), but in the case of the present embodiment, It has the same shape as the protrusion 15 shown in (C).
- each of the projections 15 is a convex arc.
- the member forming each of the projections 15 may be on the inner column 12 side of the steering column 3. That is, these projections 15 may be formed at one end (the right end in FIG. 19) of the inner column 12 so as to project radially outward.
- the projections 15 are unevenly arranged in the circumferential direction of the outer column 11.
- the arrangement of these projections 15 in the circumferential direction is a position deviated vertically in a state where the steering column 3 is mounted on the lower surface of the instrument panel of the vehicle. That is, assuming that the overlapping portion 13 of the outer column 11 and the inner column 12 is divided into two parts by a virtual line N in the horizontal direction (the horizontal direction in FIG. 18), as shown in FIG.
- the angle ⁇ formed by the line N and each of the protrusions 15 and the angle ⁇ formed by the vertical virtual line M and each of the protrusions 15 are different from each other.
- the angle 0 is larger than the angle 0.
- each of the projections 15 are formed on the outer column 11 as described above, one end of the inner column 12 is provided inside one end of the outer column 11 (see FIG. 19). With the right end) inserted, each of the projections 15 and the outer peripheral surface of the inner column 12 are fitted with a tightening margin, and this portion constitutes the fitting portion 14. Further, in the present embodiment, since each of the projections 15 is provided at four locations in the circumferential direction of each of the deformed portions 21, each of the fitting portions 14 is provided at four locations for each of the deformed portions 21. Exists.
- each fitting portion 14 is unequally arranged in the circumferential direction of the overlapping portion 13, and more specifically, each of the fitting portions 14 sandwiches the virtual line M in the vertical direction.
- the space between the fitting portions 14 in the circumferential direction is arranged to be smaller than the space in the circumferential direction between the fitting portions 14 that interpose the horizontal imaginary line N. 13 exists in a state biased upward and downward.
- each fitting portion 14 is configured by fitting a projection 15 formed on the outer column 11 to the inner column 12.
- the cross section of a part of the outer column must be elliptical or polygonal, and this part should be fitted to the inner column. It may be configured by:
- the collapse load can be stabilized irrespective of the change in the interference of the fitting portion 14, and the strength against the vertical bending in the mounted state can be achieved.
- a structure that can easily secure the structure can be obtained at low cost. That is, by making the arrangement of the fitting portions 14 uneven, the influence of the change in the interference of the fitting portions 14 on the Collabs load can be reduced. In other words, the change in the Collabs load with respect to the change in the interference of these fitting portions becomes insensitive. This will be described in detail below.
- the arrangement of the fitting portions 14 is deviated vertically. Therefore, the outer column 11 easily bends in the direction in which the vertical dimension is changed. For this reason, even if the interference of each of the fitting portions 14 changes, the force of change of the interference is easily absorbed by elastically deforming the cross section of the outer column 11 in the direction of changing the dimension in the vertical direction. As a result, the influence of the change in the interference of the fitting portions 14 on the Collabs load is reduced, and a stable Collabs load can be obtained without increasing the accuracy of the interference of the fitting portions 14.
- the fitting portions 14 of the deformed portions 21 at the positions are arranged so as to be deviated in the vertical direction, the strength against the bending force in the vertical direction can be further increased. As a result, the steering column 3 becomes twisted in the event of a collision, and the steering column 3 can be contracted stably (smoothly).
- shock absorbing steering column device of this embodiment is incorporated in the electric power steering device as shown in Fig. 15 described above, a highly safe and inexpensive electric power steering device can be obtained.
- the portion of the inner column 12 that is fitted inside the outer column 11 at the end is tapered, but this portion is (without changing the outer diameter in the axial direction, ) It may be formed into a simple cylindrical shape.
- FIG. 20 shows a ninth embodiment of the present invention.
- protrusions 15 are formed at three circumferential positions of one deformed portion 21 of the outer column 11, respectively. Therefore, when one end of the inner column 12 is inserted inside one end of the outer column 11, there are three fitting portions 14 for each of the deformed portions 21. Each of these fitting portions 14 is provided at two locations on the upper side and one location on the lower side of the overlapping portion 13 of the outer column 11 and the inner column 12 in the mounted state.
- the circumferential distance between the fitting portions 14 is an angle formed by the lower fitting portion 14 and the upper fitting portion 14, and the upper fitting portion 14 The angle between each other ⁇ , The angle ⁇ ⁇ ⁇ ⁇ with respect to the lower fitting portion 14 is
- the upper fitting portion 14 also has a small vertical line M force ( ⁇ Z2).
- FIG. 21 shows a tenth embodiment of the present invention.
- the axially separated position of the overlapping portion 13 of the outer column 11 and the inner column 12 is not circumferentially related.
- fitting parts 14 There are evenly arranged fitting parts 14.
- the steering wheel is present in the right direction in FIG. 19 and that the steering wheel is inclined upward in the direction of directional force to the right in FIG. Therefore, the direction of the bending force acting on the steering column due to the secondary collision is counterclockwise in FIG. 19 from the outer column 11 to the inner column 12.
- the fitting portions 14 existing in a portion corresponding to the FF cross section on the right side of FIG. 19 are arranged as shown in FIG. 21 (A).
- the fitting portion 14 existing in a portion corresponding to the cross section of the left mouth in FIG. 19 is arranged as shown in FIG. 21 (B).
- the fitting portions 14 existing in the portion corresponding to the FF section are arranged at two places on the lower side in FIG. 21 (A), and only one place is arranged on the upper side. Further, the fitting portions 14 existing in the portion corresponding to the GG section are arranged at two places on the upper side in FIG. 21B, and only one place is arranged on the lower side.
- the bending force due to the secondary collision acts counterclockwise in FIG. For this reason, at the time of collision, the above bending force is applied to the lower fitting portion 14 at the portion corresponding to the FF section and to the upper fitting portion 14 at the portion corresponding to the mouth-to-mouth section.
- the fitting portions 14 by arranging the fitting portions 14 as described above, the number of the fitting portions 14 on which the bending force acts is increased. This With such a configuration, the surface pressure of each fitting portion 14 to which a bending force is applied at the time of a collision can be reduced, so that the steering column is less likely to be twisted at the time of a collision, and the contraction of the steering column is more stabilized (smoothly). Can be done. In addition, even when a load is generated based on a bending force at the time of a collision, the portion forming the fitting portion is less likely to be plastically deformed, and a stable Collabs load can be obtained.
- the portion corresponding to the FF section in FIG. 19 is the structure shown in FIG. 21 (A), and the portion corresponding to the GG section in FIG. 19 is shown in FIG. 21 (B).
- the bending force can be sufficiently supported, and the steering column is liable to be twisted by the bending force.
- Other structures and operations are the same as those in the ninth embodiment.
- FIG. 22 shows an eleventh embodiment of the present invention. Also in the case of the present embodiment, similarly to the above-described Embodiment 10, at the axially separated positions of the overlapping portion 13 of the outer column 11 and the inner column 12, they are respectively arranged unevenly in the circumferential direction. There is a fitting portion 14 that has been fitted. Further, in the case of the present embodiment, it is assumed that the steering wheel is present in the right direction in FIG. 22 and that the steering wheel is inclined upward in the direction of directional force to the right in FIG. Therefore, the direction of the bending force acting on the steering column due to the secondary collision is counterclockwise in FIG. 22 from the outer column 11 to the inner column 12.
- the arrangement of the fitting portions 14 in the circumferential direction is unevenly arranged as in the above-described eighth or ninth embodiment.
- the axial length a of the lower fitting portion 14 of the fitting portion 14 existing on the right side of FIG. Longer than the axial length b (a > b).
- the axial length c of the upper fitting portion 14 is made larger than the axial length d of the lower fitting portion 14. (C> d).
- the fitting portion 14 in the case of the fitting portion 14 existing on the right side of FIG. 22, the axial length of the fitting portion 14 existing below FIG. In the case of the fitting portion 14 on the left side of FIG. 22, the axial length of the fitting portion 14 on the upper side of FIG. 18 is increased.
- the fitting portions 14 are arranged as in the structure of the above-described embodiment 10 shown in FIG.
- the bending force due to the secondary collision acts in the counterclockwise direction in FIG. Therefore, at the time of a collision, the bending force acts on the lower fitting portion 14 on the right side in FIG. 22, and on the upper fitting portion 14 on the left side in FIG. Therefore, in the case of the present embodiment, by restricting the axial length of each fitting portion 14 as described above, the axial length of the fitting portion 14 on which this bending force acts is increased. I have. With this configuration, the surface pressure of each fitting portion 14 to which a bending force is applied at the time of a collision can be reduced, so that the steering column is liable to be twisted at the time of a collision, and the contraction of the steering column is more stabilized (smooth). ).
- the outer column 11 is disposed on the right side (ie, the steering wheel side) in Fig. 22 and the inner column 12 is disposed on the left side in Fig. 22.
- the axial length of the lower fitting portion 14 is shown in the right portion of FIG. 22, and the axial length of the upper fitting portion 14 is shown in the left portion of FIG. If each is increased, the above bending force can be sufficiently supported, and the steering column is less likely to be twisted by the bending force.
- the axial length of the fitting portion 14 on which the bending force acts is increased. Accordingly, the force that increases the strength against the bending force may be increased in the circumferential length of the fitting portion 14. In short, the strength against this bending force can be increased by increasing the area of the fitting portion on which the bending force acts. In addition, if the area of the fitting portion on which the bending force acts is increased, the portion constituting the fitting portion is less likely to be plastically deformed even under a load based on the bending force at the time of a collision, so that the Collabs load is reduced. Fluctuation is suppressed. As a result, a stable collapse load can be obtained.
- fitting portions 14 are also provided at two locations in the horizontal direction, and a total of six fitting portions are provided.
- the interference of the fitting portion 14 arranged at a position deviated in the vertical direction is made larger than the interference of the two fitting portions in the horizontal direction. Even with such a configuration, the change in the Collabs load with respect to the change in the interference of each fitting portion 14 can be made insensitive. Further, since the fitting portion 14 for increasing the interference is a fitting portion 14 arranged at a position deviated in the vertical direction, the bending rigidity in the vertical direction can be sufficiently improved.
- a spacer made of a low friction material such as a synthetic resin may be arranged between the inner peripheral surface of the outer column 11 and the outer peripheral surface of the inner column 12. That is, the spacer is inserted into the overlapping portion 13 of the outer column 11 and the inner column 12, and the fitting portions 14 of the overlapping portion 13 are fitted through the low friction material. May be.
- at least one of the inner peripheral surface of the outer column 11 and the outer peripheral surface of the inner column 12 that is fitted to the other peripheral surface, that is, the superposed portion 13 is treated with metal stone. Low friction surface treatment such as With such a configuration, it is possible to more stably obtain the Collabs load, which increases the cost somewhat.
- FIG. 24 shows a twelfth embodiment of the present invention.
- the features of the present invention are to stabilize the Collabs load regardless of the change in the interference of the fitting portions 14a and 14b (to prevent a large change), and to make the bending force in the up and down direction in the state of attachment to the vehicle To secure strength (rigidity)
- the point is to regulate the interference of the fitting portions 14a and 14b. Since the structure and operation of the other parts are the same as those of the above-described conventional structure, overlapping illustration and description will be omitted or simplified, and the following description will focus on the characteristic parts of this embodiment.
- each of the fitting portions 14a and 14b is formed by a part of the overlapping portion 13 where one end of the outer column 11 and one end of the inner column 12 constituting the steering column 3 overlap. , At equal intervals in the circumferential direction.
- the interference of the fitting portion 14a that is present in the vertical direction in the state of attachment to the vehicle is made larger than the interference of the fitting portion 14b that is also present in the horizontal direction.
- the inner column is formed at one end of the inner column 11, and The dimensions of the deformed portion 21 having a portion fitted to one end of the 12 by interference fit are regulated as follows.
- the shape of the deformed portion 21 of the outer column 11 is a square having flat portions 22a and 22b at four circumferential positions, the surfaces facing each other being parallel to each other. I have.
- Each of the flat portions 22a and 22b and the outer peripheral surface of one end of the inner column 12 are fitted together with a margin, and these portions are used as the fitting portions 14a and 14b.
- the space Y between the flat portions 22a positioned vertically in the state of being attached to the vehicle is similarly horizontal.
- the distance X between the flat portions 22b located in the direction is smaller than the distance X (Y ⁇ X>).
- both X and Y are slightly smaller than the outer diameter of the inner column 12.
- the outer peripheral surface of the inner column 12 is formed in a cylindrical shape.
- the interference of the fitting portion 14a positioned in the vertical direction is reduced in the horizontal direction. It is larger than the interference of the located fitting portion 14b.
- the Collabs load can be stabilized irrespective of the change in the interference of the fitting portions 14a and 14b, and the bending force in the vertical direction in the state of attachment to the vehicle.
- a structure that can ensure the strength (bending stiffness) of the structure can be obtained at low cost.
- the interference of the fitting portion 14a positioned in the vertical direction is determined by the fitting portion 14b positioned in the horizontal direction, which is another fitting portion described in the claims.
- Each of these fittings 14a, 1 The effect of the change in the interference of 4b on the Collabs load can be reduced. In other words, the change in the Collabs load with respect to the change in the interference of these fitting portions 14a and 14b becomes insensitive. This point will be described in detail below.
- the interference of the fitting portion 14a that is positioned in the up-down direction when mounted on the vehicle is changed by the fitting portion 14b that is also positioned in the left-right direction. It is larger than the deadline. Therefore, the outer column 11 can easily bend in the direction in which the vertical dimension is changed. Therefore, even if the interference of the fitting portions 14a and 14b changes, the change of the interference causes the cross section of the outer column 11 to be elastically deformed in the direction of changing the dimension in the vertical direction. Easy to be absorbed. As a result, the influence of the change in the interference of the fitting portions 14a and 14b on the Collabs load is reduced, and the stable Collabs load without increasing the accuracy of the interference of the fitting portions 14a and 14b is improved. Can be obtained.
- the steering column 2 When the steering column 3 is mounted on an automobile, the steering column 2 (see Figs. 14 and 15) is prevented from vibrating during running or idling. Is needed.
- the fitting margin of the fitting portion 14a located upward and downward is increased, so that the strength against the bending force in the vertical direction ( Support stiffness). As a result, transmission of vibration to the steering wheel 2 during running or idling can be suppressed.
- the interference of the fitting portions 14a and 14b is made different between the fitting portion 14a in the vertical direction and the fitting portion 14b in the horizontal direction, the flat portions 22a and Even if the accuracy with respect to the roundness of the inner column 12 fitted to the inner column 22b is low, the difference in the contact state between the fitting portions 14a and 14b can be absorbed and the strength against bending force can be secured. As a result, even if the accuracy of the inner column 12 regarding roundness is low, a sufficient vibration preventing effect can be obtained. In this way, it is possible to prevent the vibration that would otherwise increase the accuracy of the interference of the fitting portions 14a and 14b and the roundness of the inner column 12 (or the outer column 11), and stabilize the Collabs load. If this is achieved, a highly safe shock-absorbing steering column device that facilitates optimal setting of energy absorption during a collision can be obtained at low cost.
- the shock absorbing steering column device of the present embodiment is incorporated in the electric power steering device as shown in FIG. 15, the safety of the electric power steering device can be improved.
- the device can be obtained at low cost.
- the axial stroke of the overlapping portion 21 is shortened to reduce the collapse stroke. Easy to secure,.
- FIG. 25 shows a thirteenth embodiment of the present invention.
- the fitting portions 14a and 14b are formed in a circular shape at a part of the overlapping portion 13 where one end of the outer column 11 and one end of the inner column 12 overlap.
- the structure is provided at equal intervals in the circumferential direction.
- the interference of the fitting portion 14a positioned in the up-down direction in the state of being attached to the vehicle is set to be larger than the interference of the fitting portion 14b similarly positioned in the horizontal direction. ing.
- the protrusion amounts of the protrusions 15a and 15b formed at four locations located at equal intervals in the circumferential direction are as follows. Regulating. That is, these projections 15a and 15b are arranged at equal intervals in the circumferential direction of the deformed portion 21, and are mounted radially inward at two places in the vertical direction, similarly at two places in the horizontal direction when mounted on the vehicle.
- the shape of the tip surface is formed in a convex arc shape.
- the members forming the projections 15a and 15b may be on the inner column 12 side. That is, the projections 15a and 15b may be formed at one end of the inner column 12 so as to project radially outward.
- one of the protrusions 15a and 15b is vertically positioned before the one end of the outer column 11 is fitted to one end of the inner column 12, one of the protrusions 15a and 15b is vertically positioned.
- the protrusion amount of the projection 15a to be placed is larger than the protrusion amount of the protrusion 15b positioned in the horizontal direction.
- the distance Y between the protrusions 15a located in the vertical direction is smaller than the distance X between the protrusions 15b positioned in the horizontal direction (Y ⁇ X).
- FIG. 26 shows a fourteenth embodiment of the present invention.
- the shapes of the tips of the projections 15c and 15d constituting the fitting portions 14a and 14b are concave arc shapes. For this reason, when one end of the outer column 11 is fitted to one end of the inner column 12, the projections 15c and 15d formed on the deformed portion 21 of the outer column 11 come into contact with the outer peripheral surface of the inner column 12. (In comparison with the protrusions 15a and 15b of the thirteenth embodiment described above), they are fitted over a wide range in the circumferential direction. Other structures and operations are the same as those in the above-described thirteenth embodiment.
- FIG. 27 shows a fifteenth embodiment of the present invention.
- a spacer 23 made of a low-friction material such as a synthetic resin is disposed between the inner peripheral surface at one end of the outer column 11 and the outer peripheral surface at one end of the inner column 12. That is, the spacer 23 is inserted into the overlapping portion 13 of the outer column 11 and the inner column 12, and the spacer 23 is inserted.
- the fitting portions 14a and 14b are fitted via the.
- the provision of the spacer 23 increases the manufacturing cost, but more stably obtains the Collabs load.
- at least one of the inner peripheral surface of the outer column 11 and the outer peripheral surface of the inner column 12 is fitted to the other peripheral surface, that is, The superimposed portion 13 may be subjected to a low friction surface treatment such as a metal stone treatment.
- a low friction surface treatment such as a metal stone treatment.
- FIG. 28 shows a sixteenth embodiment of the present invention.
- the circumferential length of the fitting portion 14a which is present in the up-down direction in the state of being attached to the vehicle is similarly set in the horizontal direction. It is larger than the fitting portion 14b existing at the bottom. That is, the projections 25a and 25b are formed radially inward at four positions located at equal intervals in the circumferential direction of the deformed portion 21 of the outer column 11.
- Each of the protrusions 25a and 25b is formed in a pair facing each other in the vertical and horizontal directions of the deformed portion 21.
- the protrusion 2 The circumferential length of 5a is larger than the circumferential length of the protrusion 25b present in the horizontal direction.
- the angles ⁇ a and ⁇ b formed by imaginary lines connecting the center of the outer column 13 and the circumferential ends of each of the projections 25a are regulated as follows. That is, the angle ⁇ a for the protrusion 25a existing in the vertical direction is set to be larger than the angle ⁇ b for the protrusion 25b existing in the horizontal direction ( ⁇ a> ⁇ b).
- a spacer 23 made of a low-friction material such as a synthetic resin is disposed between the inner peripheral surface at one end of the outer column 11 and the outer peripheral surface at one end of the inner column 12.
- the fitting portions 14a and 14b are fitted via the spacer 23!
- the length in the circumferential direction of the fitting portion 14a present in the vertical direction is changed by the length in the circumferential direction of the fitting portion 14b present in the horizontal direction. Since it is larger than the size, the Collabs load can be stabilized irrespective of a change in the interference of each of the fitting portions 14a and 14b. Further, the strength against the bending force in the vertical direction can be increased. Further, since the area of the fitting portion 14a present in the vertical direction is large, the surface pressure acting on each of the fitting portions 14a in the vertical direction decreases, and the bending force of each fitting portion 14a in the vertical direction decreases. The durability against this is improved (it becomes plastic deformation).
- FIG. 29 shows a seventeenth embodiment of the present invention.
- a pair of deformed portions 21 axially separated from each other is provided at a portion of one end (the left end in FIG. 29) of the outer column 11 which is externally fitted to one end of the inner column (not shown).
- Each of these deformed portions 21 has outer fitting portions 24a and 24b which form fitting portions in a state of being fitted to one end of the inner column. That is, these outer fitting portions 24a and 24b are One end is formed at a plurality of locations located at equal intervals in the circumferential direction.
- the outer column 11 is fitted with an outer peripheral surface of one end of the inner column with a interference.
- the outer fitting portions 24a and 24b for example, the flat portion shown in FIG. 24 described above and the projections shown in FIGS. 25 and 26 can be used.
- one of the outer fitting portions 24a and 24b is vertically mounted in the state of being attached to the vehicle (if it is not in the vertical direction, it is in the vicinity of the vertical direction).
- the axial length of the outer fitting portions 24a, 24b located is regulated as follows. That is, of the fitting portion between the outer column 11 and the inner column 12, the axial length a of the outer fitting portion 24a constituting the fitting portion located at the portion where the bending force acts upon collision, b is larger than the axial lengths c and d of the outer fitting portion 24b constituting the other fitting portion (a> c, b> d).
- the axial lengths a and b of the outer fitting portion 24a constituting each fitting portion located at the portion where the bending force acts are used as other fitting portions.
- the length of the outer fitting portion 24b in the axial direction is larger than c and d (a> c, b> d).
- the structure of the present embodiment is a structure that can sufficiently obtain the axial dimension of the steering column and that is applied to a structure that is required to increase the strength against the bending force acting upon the collision. .
- FIGS. 30 to 32 show an eighteenth embodiment of the present invention. Also in the case of the present embodiment, it is assumed that the steering column 3 is attached to the vehicle, the steering column is present in the right direction in FIG. 30, and the steering column is inclined upward in the direction of directional force to the right in FIG. Therefore, also in the case of the present embodiment, the bending force acting at the time of collision acts from the outer column 11 to the inner column 12 in the counterclockwise direction in FIG.
- outer fitting portions 26a and 26b are respectively provided at two axially separated positions on one end (left end in FIG. 30) of the outer column 11 constituting the steering column 3. Deformation parts 21a and 21b are provided.
- Each of the deformed portions 21a and 21b has a substantially elliptical cross-sectional shape, and has a smaller vertical dimension when mounted on a vehicle.
- the vertically existing portions of the deformed portions 21a and 21b are formed along the outer peripheral surface of the inner column 12 (with a different radius of curvature) to form the outer fitting portions 26a and 26b. .
- the outer fitting portions 26a and 26b When one end of the outer column 11 is externally fitted to one end of the inner column 12 (the right end in FIG. 30), the outer fitting portions 26a and 26b have a It is fitted to the outer peripheral surface of one end of the column 12 to form fitting portions 27a and 27b. Therefore, as described above When the bending force acts in the counterclockwise direction in FIG. 30, the bending force is applied to the fitting portion 27a formed by the lower outer fitting portion 26a in the right deformed portion 21a in FIG. The deformed portion 21b on the left side of FIG. 30 acts on the fitting portion 27a formed by the upper outer fitting portion 26a.
- the circumferential length of each of the fitting portions 27a and 27b is regulated as follows. That is, as for the deformed portion 21a of the steering column 3 on the steering wheel side (right side in FIG. 30), as shown in FIG. 31, the circumferential dimension of the lower fitting portion 27a is changed to the upper fitting portion. It is larger than the circumferential length of 27b. On the other hand, as for the deformed portion 21b on the opposite side of the steering wheel of the steering column 3 (left side in FIG. 30), as shown in FIG. Is larger than the circumferential length of the lower fitting portion 27b. For this reason, in the case of the present embodiment, the virtual lines connecting the circumferential end portions of the outer fitting portions 26a and 26b constituting the fitting portions 27a and 27b and the center of the outer column 11 are formed. Angle ⁇ ⁇ ⁇
- the angle 0 with respect to the outer fitting portion 26 above the deformed portion 21a on the steering wheel side is smaller than the angle ⁇ ⁇ ⁇ ⁇ with respect to the lower outer fitting portion 26a ( ⁇ ⁇ ).
- the angle 0 of the upper outer fitting portion 26a of the deformed portion 21b opposite to the steering wheel is larger than the angle 0 of the lower outer fitting portion 26b (0> ⁇
- fitting portions 27a and 27b having the predetermined circumferential length as described above are obtained.
- the portion of the inner column 12 that is fitted inside the outer column 11 at one end is tapered, but this portion (without changing the outer diameter in the axial direction). It may be formed in a simple cylindrical shape.
- the strength against the bending force acting upon collision can be sufficiently increased. That is, also in the case of the present embodiment, the fitting portion located at the portion where the bending force acts upon collision is the lower fitting portion 27a for the deformed portion 21 and the upper fitting portion 27a for the deformed portion 21b. is there. Therefore, the circumferential length of each of the fitting portions 27a is changed to the circumferential length of the other fitting portions 27b. By making it larger, the strength against the bending force can be made sufficiently large. For this reason, the fitting portions 27a and 27b are twisted by the bending force applied at the time of the collision, and the steering column can be contracted (smoothly) stably.
- outer column 11 and the inner column 12 overlap with each other because the length of each fitting portion 27a in the circumferential direction is increased in order to increase the strength against bending force acting upon collision. It is easy to secure the collapse stroke of the steering column without increasing the axial dimension of the part 13.
- Other structures and operations are the same as those in the seventeenth embodiment.
- the force described when the fitting portion is located in the vertical direction is applicable.
- the present invention is also applicable to a case where the fitting portion does not exist in the vertical direction. That is, among the plurality of fitting portions located at equal intervals in the circumferential direction at a part of the overlapping portion of the outer column and the inner column, the fitting portion existing in the vicinity in the up-down direction among the plurality of fitting portions described above. Similar effects can be obtained by applying the example.
- the vicinity in the up-down direction means that the center position of the fitting portion exists within a range of 10 ° or less on both sides in the circumferential direction from the up-down direction (within a range of 20 ° in total). That is, the angle between the virtual line connecting the center of the fitting portion in the circumferential direction and the center of the steering column and the vertical virtual line passing through the center of the steering column is within 10 °. .
- the above-described embodiments may be implemented in appropriate combinations. That is, Increase the area (axial length or circumferential length) of the fitting part located in the vertical direction or in the vicinity of the vertical direction in the state of attachment to the vehicle, and increase the tightening margin. You can also.
- the tightening of the fitting portion 14a existing in the vertical direction is performed in addition to restricting the circumferential length of the fitting portions 14a and 14b.
- the margin is set larger than the interference of the fitting portion 14b existing in the horizontal direction.
- the fitting margin or the area (length in the axial direction or circumferential direction) of the fitting portion located in the vertical direction or in the vicinity of the vertical direction in the state of attachment to the vehicle is increased or widened, and bent at the time of collision.
- the area of the fitting portion located at the portion where the force acts can be increased.
- the interference of the fitting portions located in the vertical direction is increased.
- the axial dimension of the outer fitting portion 24a constituting the fitting portion on which the bending force acts is increased, and the outer fitting portion constituting the fitting portion located in the up-down direction among the respective fitting portions.
- the protrusion amounts of 24a and 24b are made larger than the protrusion amounts of the outer fitting portions constituting the other fitting portions.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Power Steering Mechanism (AREA)
- Steering Controls (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP05748887A EP1754645A4 (en) | 2004-06-11 | 2005-06-09 | SHOCK-ABSORBING STEERING COLUMN DEVICE AND ELECTRICALLY DRIVEN POWER STEERING DEVICE |
US10/583,307 US20070234838A1 (en) | 2004-06-11 | 2005-06-09 | Impact Absorbing Steering Column Device and Electrically Driven Power Steering Device |
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004-173383 | 2004-06-11 | ||
JP2004173383A JP2005349968A (ja) | 2004-06-11 | 2004-06-11 | 衝撃吸収式ステアリングコラム装置と電動式パワーステアリング装置 |
JP2005-040056 | 2005-02-17 | ||
JP2005040056A JP4792762B2 (ja) | 2005-02-17 | 2005-02-17 | 衝撃吸収式ステアリングコラム装置と電動式パワーステアリング装置 |
JP2005049880A JP2006232103A (ja) | 2005-02-25 | 2005-02-25 | 衝撃吸収式ステアリングコラム装置と電動式パワーステアリング装置 |
JP2005-049880 | 2005-02-25 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005120930A1 true WO2005120930A1 (ja) | 2005-12-22 |
Family
ID=35502945
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2005/010618 WO2005120930A1 (ja) | 2004-06-11 | 2005-06-09 | 衝撃吸収式ステアリングコラム装置と電動式パワーステアリング装置 |
Country Status (3)
Country | Link |
---|---|
US (1) | US20070234838A1 (ja) |
EP (1) | EP1754645A4 (ja) |
WO (1) | WO2005120930A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2020085244A1 (ja) * | 2018-10-22 | 2020-04-30 | 日本精工株式会社 | ステアリングコラムおよびステアリング装置 |
US11447170B2 (en) * | 2018-10-22 | 2022-09-20 | Nsk Ltd. | Steering column and steering device |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2647544B1 (en) * | 2011-02-25 | 2015-09-30 | NSK Ltd. | Steering column device |
JP6003395B2 (ja) * | 2012-08-23 | 2016-10-05 | 日本精工株式会社 | テレスコピックステアリング装置 |
JP2020100357A (ja) * | 2018-12-25 | 2020-07-02 | 株式会社ジェイテクト | ステアリング装置 |
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2020085244A1 (ja) * | 2018-10-22 | 2020-04-30 | 日本精工株式会社 | ステアリングコラムおよびステアリング装置 |
JPWO2020085244A1 (ja) * | 2018-10-22 | 2021-09-16 | 日本精工株式会社 | ステアリングコラムおよびステアリング装置 |
US11447170B2 (en) * | 2018-10-22 | 2022-09-20 | Nsk Ltd. | Steering column and steering device |
US11511788B2 (en) | 2018-10-22 | 2022-11-29 | Nsk Ltd. | Steering column and steering device |
JP7314951B2 (ja) | 2018-10-22 | 2023-07-26 | 日本精工株式会社 | ステアリングコラムおよびステアリング装置 |
Also Published As
Publication number | Publication date |
---|---|
EP1754645A1 (en) | 2007-02-21 |
EP1754645A4 (en) | 2007-12-12 |
US20070234838A1 (en) | 2007-10-11 |
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