JP2008024229A - Electric telescopic-adjustment type steering device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric telescopic-adjustment type steering device capable of consistently absorbing the impact energy when an impact load is applied to a steering wheel. <P>SOLUTION: The electric telescopic-adjustment type steering device comprises a steering column 12 having an outer column 12a and an inner column 12b which are connected to each other in a relatively expandable manner and rotatably supporting a steering shaft 11 having a steering wheel 13, and an electric actuator 50 for expanding/contracting the outer column 12a and the inner column 12b with one end mounted on the outer column 12a and the other end mounted on the inner column 12b. The electric actuator 50 has contraction parts 58a, 58b which are contracted to absorb the impact energy while generating a predetermined load in the axial direction when the impact load is input, and a coating film 58d of a solid lubricant is formed on the contraction part 58b of the electric actuator. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention includes an outer column and an inner column that are relatively telescopically connected, a steering column that rotatably supports a steering shaft to which a steering wheel is attached, one end portion of the outer column, and the other end The present invention relates to an electric telescopic adjustment type steering apparatus provided with an electric column actuator attached to the inner column and extending and contracting the outer column and the inner column.

Conventionally, an electric telescopic steering device has been proposed in which a shaft provided on a different axis from the steering column is driven in the axial direction by a motor to expand and contract a column connected to the shaft. As this electric telescopic steering device, for example, as described in Patent Document 1, a housing inner cylinder is slidably accommodated in a housing cylinder, and a steering shaft having a steering wheel at the tip is provided in the housing inner cylinder. The electric motor is attached to the housing cylinder, the mounting plate is attached to the inner cylinder of the housing, and a connecting rod is disposed between the electric motor and the mounting plate. The connecting rod is connected to the electric motor. It consists of a shaft that moves in conjunction with the shaft, and an outer cylinder that is slidably inserted in the axial direction, inserted through the mounting plate, and tightened with a nut, and penetrates the shaft and the outer cylinder. One or more pins are press-fitted, and the pins are broken and collapsed by an impact force generated at the time of a collision or the like.
JP 2003-276616 A (first page, FIGS. 1 and 2)

  In the conventional example described in Patent Document 1, when a secondary collision load acts on the steering wheel, the secondary collision load acts on the outer cylinder of the connecting rod via the housing inner cylinder and the mounting plate. In this way, the pin that is press-fitted so as to penetrate the shaft and the inner cylinder can be broken and collapsed, but in order to absorb the energy at the time of the secondary collision, the pin is broken at the time of collapse. The relative movement between the shaft and the outer cylinder needs to be performed while applying a predetermined load, and the load during the relative movement needs to be stabilized in order to stably absorb energy. For this reason, conventionally, grease is applied to the sliding contact surface between the shaft and the outer cylinder.

  However, even when grease is applied to the sliding contact surface between the shaft and the outer cylinder at the time of assembly of the electric telescopic adjustment type steering device, the grease applied during the relative movement between the shaft and the outer cylinder at the time of the secondary collision There is an unsolved problem that the sliding surface becomes unstable, the lubrication state becomes unstable, the load is not stable, and stick slip may occur.

In addition, in order to stabilize the relative movement at the time of the secondary collision at the joint between the shaft and the outer cylinder instead of the pin, the shaft and the outer cylinder slide on the inner and outer peripheral surfaces between the shaft and the outer cylinder. It is also conceivable to provide an impact absorbing member in which a plurality of concave and convex portions extending in the axial direction in contact with each other are formed in the circumferential direction. In this case, grease is held in the concave portion of the leaf spring, and the lubricity is somewhat good. However, since the concave portion extends in the axial direction, grease is not supplied to the tip of the convex portion that is in sliding contact with the shaft and the outer cylinder, the lubrication state of the contact surface becomes unstable, and the load is not stable. At the same time, there is an unsolved problem that stick-slip may occur.
Therefore, the present invention has been made paying attention to the unsolved problems of the above-mentioned conventional example, can stably perform the lubrication of the contraction portion that contracts when an impact load is applied to the steering wheel, An object of the present invention is to provide an electric telescopic adjustment type steering apparatus capable of stably absorbing impact energy.

In order to achieve the above object, an electric telescopic adjustment type steering apparatus according to claim 1 has an outer column and an inner column which are relatively telescopically connected, and a steering shaft to which a steering wheel is attached is rotatable. A steering column to be supported; and an electric actuator having one end attached to the outer column and the other end attached to the inner column, and extending and contracting the outer column and the inner column. Is an electric telescopic adjustment type steering device having a contraction part that contracts while absorbing a shock energy while generating a predetermined load in the axial direction,
A solid lubricant film is formed on the contracted portion of the electric actuator.

According to a second aspect of the present invention, there is provided the electric telescopic adjustment type steering apparatus according to the first aspect, wherein the electric actuator is arranged in parallel with a predetermined offset amount with respect to a central axis of the inner column. It is characterized by comprising a rod driven by an electric motor.
Furthermore, the electric telescopic adjustment type steering apparatus according to claim 3 is the invention according to claim 2, wherein the rod is an inner rod, and an outer rod through which the inner rod is inserted so as to be relatively movable through a predetermined gap. An impact that is inserted into a gap between the inner rod and the outer rod and has corrugated irregularities on the inner and outer peripheral surfaces to allow the inner rod and the outer rod to contract while applying a predetermined load when a secondary collision load is applied. And a solid lubricant film is formed on at least one sliding contact surface of the inner rod and the outer rod.

  Furthermore, the electric telescopic adjustment type steering apparatus according to claim 4 is the invention according to claim 2, wherein the rod is an inner rod and a relative load while applying a predetermined load to the inner rod when a secondary collision load is applied. An outer rod that is movably inserted and a pin that breaks when the secondary collision load is interposed between the inner rod and the outer rod, and is solid on at least one sliding surface of the inner rod and the outer rod. It is characterized in that a lubricant film is formed.

  Still further, the electric telescopic adjustment type steering apparatus according to claim 5 is the invention according to claim 2, wherein the rod is formed on a female screw formed on an inner peripheral surface of a worm wheel of a worm speed reduction mechanism having one end connected to an electric motor. The other end of the rod is inserted into the connecting member fixed to either the outer column or the inner column so as to be relatively movable while applying a predetermined load when a secondary collision load is applied. A solid lubricant film is formed on the sliding contact portion with the connecting member.

  According to the present invention, when the impact load in the electric actuator for contracting the outer column and the inner column is input, the coating of the solid lubricant is formed in the contracting portion that contracts in the axial direction and absorbs the impact energy. When the contraction portion contracts due to an impact load, stable lubrication can be performed without the solid lubricant being scraped, and an effect that stable impact energy absorption can be performed is obtained.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an overall configuration diagram showing a vehicle assembled with an electric telescopic adjustment type steering device according to the present invention, FIG. 2 is an overall configuration diagram showing a first embodiment of an electric telescopic adjustment type steering device according to the present invention, and FIG. Is a cross-sectional view taken along line AA in FIG. 2, FIG. 4 is a cross-sectional view taken along line BB in FIG. 3, FIG. 5 is a cross-sectional view of the main part of the present invention, and FIG. 7 is a cross-sectional view taken along the line DD of FIG. 5, and FIG. 8 is a cross-sectional view similar to FIG.

  In FIG. 1, a steering column device 10 includes a steering column 12 that supports a steering shaft 11 so as to be rotatable. A steering wheel 13 is mounted at the rear end of the steering shaft 11, and an intermediate shaft 15 is connected to the front end of the steering shaft 11 via a universal joint 14. A steering gear 17 composed of a rack and pinion mechanism or the like is connected to the intermediate shaft 15 via a universal joint 16 at its front end. The output shaft of the steering gear 17 is connected to the steered wheel 19 through a tie rod 18.

When the driver steers the steering wheel 13, the rotational force is transmitted to the steering gear 17 via the steering shaft 11, the universal joint 14, the intermediate shaft 15, and the universal joint 16, and the rack and pinion mechanism rotates the vehicle. The steered wheel 19 is steered through the tie rod 18 after being converted into a linear motion in the width direction.
In addition, peripheral components P such as a combination switch and a column cover for driving an electric tilt mechanism 30 and an electric telescopic mechanism 50, which will be described later, are disposed in the vehicle rear portion of the steering column 12.

  As shown in FIG. 5, the steering column device 10 is disposed so as to be inclined backward by a predetermined angle θ with respect to the horizontal direction of the vehicle. As shown in FIG. 5, the steering column device 10 includes an outer shaft 11a to which a steering wheel 13 is attached as shown in FIG. 5, and an inner shaft 11b that is slidably engaged with the outer shaft 11a by spline coupling or serration coupling. It consists of and.

As shown in FIGS. 2 and 5, the steering column 12 includes an outer column 12a and an inner column 12b slidably held by the outer column 12a. The outer shaft 11a of the steering shaft 11 is rotatably supported by the arranged rolling bearings 12c and 12d.
The outer column 12a has a rear end (left end in FIG. 2) on the side of the universal joint 14 supported by a lower bracket 22 attached to the vehicle body side member 21 so as to be swingable in the vertical direction by a pivot pin 23. A front end (right end in FIG. 2) is attached to the vehicle body side member 21 and is supported by the upper bracket 24 so as to be movable in the vertical direction.

As shown in FIG. 3, the upper bracket 24 includes a mounting plate portion 24b having a bulging portion 24a with a central portion bulging upward attached to the vehicle body side member 21, and a bulging portion of the mounting plate portion 24b. The guide plate portions 24c and 24d extending downward from the left and right positions of 24a and the bottom plate portion 24e connecting the lower ends of the guide plate portions 24c and 24d are formed in a rectangular frame shape.
The outer column 12a described above is inserted into the guide space 24f surrounded by the mounting plate portion 24b, the guide plate portions 24c and 24d, and the bottom plate portion 24e of the upper bracket 24. As is apparent from FIG. 3, the outer column 12a has a protruding portion that protrudes in the horizontal direction, and its end portion has guide plate portions 12d and 12e each having a vertical guide surface 12c that is closely opposed to the guide plate portions 24c and 24d. Is formed.

  The guide plate portion 12e is held by the electric tilt mechanism 30 so as to be movable in the vertical direction. As shown in FIG. 3, the electric tilt mechanism 30 is a rolling bearing 33 fixedly arranged by a restraining member 32 in a substantially rectangular frame-shaped gear housing 31 formed integrally with the lower end portion of the guide plate portion 24 d of the upper bracket 24. And a screw shaft 35 that extends in the vertical direction along the guide plate portion 24d and is rotatably supported by the rolling bearing 34 disposed on the lower surface of the mounting plate portion 24b of the upper bracket 24 described above.

  A worm wheel 36 is mounted on the screw shaft 35 in the vicinity of the rolling bearing 33 in the gear housing 31, and a worm 37 is engaged with the worm wheel 36. As shown in FIG. 4, the worm 37 is rotatably held by rolling bearings 38 and 39 disposed in the gear housing 31, and one end of the worm 37 is attached to the guide plate portion 24 d of the upper bracket 24. The output shaft 40a of the electric motor 40 fixed to the plate portion 24g is connected via a coupling 39.

  A cylindrical cover 41 that covers the screw shaft 35 is disposed in an insertion hole 31 a through which the screw shaft 35 of the gear housing 31 is inserted, and a large elasticity that slides on the outer peripheral surface of the screw shaft 35 at the tip of the cylindrical cover 41. A lip 42 made of a synthetic resin, such as polyurethane, is provided. Similarly, a lip 43 slidably contacting the outer peripheral surface of the screw shaft 35 is also provided on the lower end surface of the rolling bearing 34.

  A nut 45 held by a nut holder 44 having a square cross section is screwed between the lips 42 and 43 of the screw shaft 35. The nut holder 44 engages in a guide groove 46 formed in the guide plate portion 24d of the upper bracket 24 and extending in the vertical direction, so that the rotational movement around the axis of the screw shaft 35 of the nut holder 44 is restricted. The nut holder 44 is moved in the vertical direction by forward and reverse rotation of the screw shaft 35. An engaging pin 47 protruding from the nut holder 44 is engaged with a long hole 24h extending in the axial direction of the outer column 12a formed at the tip of the outer column 12a.

Therefore, when the worm 37 is driven forward / reversely by the electric motor 40, the screw shaft 35 is driven forward / reversely via the worm wheel 36, whereby the nut holder 44 is moved up and down, and the outer column 12a is centered on the pivot pin 23. As a result, the tilt function can be exerted.
An electric telescopic mechanism 50 as an electric actuator is provided between the outer column 12a and the inner column 12b of the steering column 12 as shown in FIG.

  As shown in FIG. 5, the electric telescopic mechanism 50 includes a gear housing 51 fixed to the steering wheel 13 side of the outer column 12 a of the steering column 12. A worm wheel 54 is rotatably supported on the gear housing 51 by rolling bearings 52 and 53 that are arranged to face each other at a predetermined distance in the axial direction of the steering column 12. The worm wheel 54 is formed in a cylindrical shape having a large-diameter outer peripheral surface at the center and small-diameter outer peripheral surfaces fitted with rolling bearings 52 and 53 on both ends sandwiching the large-diameter outer peripheral surface. In addition, a helical gear 54a is formed, and a female screw 54b is formed on the inner peripheral surface.

  As shown in FIG. 6, a worm 56 connected to an output shaft of an electric motor 55 attached to the gear housing 51 is engaged with the helical gear 54 a of the worm wheel 54. A deceleration mechanism is configured. Further, a linear motion mechanism is constituted by a connecting rod 58 and a female screw 54b of the worm wheel 54 described later.

  On the other hand, a connecting plate 57 that extends in the same direction as the gear housing 51 and is disposed at a distance from the end surface of the outer column 12a is attached to a position near the steering wheel 13 of the inner column 12b of the steering column 12. A connecting rod 58 parallel to the center axis of the steering column 12 and a predetermined offset amount L is disposed between the gear housing 51 and the gear housing 51.

The connecting rod 58 includes an outer rod 58a having one end attached to the lower end of the connecting plate 57 and an inner rod 58b slidably engaged with the other end of the outer rod 58a. It is considered to be a part.
At the joint between the outer rod 58a and the inner rod 58b, the relative movement between the outer rod 58a and the inner rod 58b is restricted depending on human power such as a normal driver. An impact absorbing member 60 that allows relative movement between the outer rod 58a and the inner rod 58b when being transmitted to the outer rod 58a via the inner column 12b and the connecting plate 57 is disposed.

The shock absorbing member 60 has a configuration in which a thin leaf spring material having a cross-sectional shape that is concave and convex in the circumferential direction is formed in a ring shape, and a collapse load that allows relative movement of the outer rod 58a and the inner rod 58b is, for example, It is set to about 2 kN or more.
A coating 58d of, for example, molybdenum disulfide-based or fluororesin-based solid lubricant is formed on the outer peripheral surface that is in sliding contact with the inner rod 58b and the impact absorbing member 60.

The inner rod 58b is formed with a male screw 58c on the side opposite to the outer rod 58a. The male screw 58c is screwed into a female screw 54b of a worm wheel 54 rotatably supported by the gear housing 51, thereby connecting rod 58b. Is arranged so as to be parallel to the axial direction of the steering column 12.
Therefore, by driving the electric motor 55 forward / reversely, driving the worm wheel 54 forward / reversely via the worm 56, and moving the inner rod 58 b back and forth in the axial direction of the steering column 12, the outer rod 58 a and the connection The inner column 12b is driven to extend and contract in the axial direction via the plate 57, so that a telescopic function can be exhibited.

Next, the operation of the first embodiment will be described.
Now, in order for the driver to adjust the tilt of the steering column 12 of the steering column device 10, the combination for the tilt mechanism provided in the peripheral part P provided in the vehicle rear portion of the steering column 12 shown in FIG. When the switch is operated in the tilt-up direction (or tilt-down direction), the electric motor 40 of the electric tilt mechanism 30 is driven forward (or reverse), for example.

  In response to this, by driving the screw shaft 35 in reverse (or forward) via the worm 37 via the worm 37, the nut 45 moves upward (or downward) as viewed in FIG. Since the engaging pin 47 formed on the nut holder 44 is engaged with the long hole 24h formed on the outer column 12a of the steering column 12, the outer column 12a rotates upward (downward) about the pivot pin 23. And tilt up (or tilt down) adjustment.

In addition, in order for the driver to perform telescopic adjustment of the steering column 12 of the steering column device 10, a telescopic mechanism combination switch provided in a peripheral part P disposed in the rear portion of the steering column 12 shown in FIG. Is operated in the expansion direction (or contraction direction), the electric motor 55 of the electric telescopic mechanism 50 is driven forward (or reverse), for example.
As a result, the worm wheel 54 is driven to rotate forward (or reversely) through the worm 56, whereby the inner rod 58 b of the connecting rod 58 moves to the steering wheel 13 side (or the side opposite to the steering wheel 13), and the impact The outer rod 58a moves to the steering wheel 13 side (or the side opposite to the steering wheel 13) via the absorbing member 60.

For this reason, the inner column 12b is pulled out from the outer column 12a via the connecting plate 57 (or the inner column 12b is inserted into the outer column 12a), and the steering column 12 is expanded (or contracted) to perform telescopic adjustment. be able to.
At this time, along with the movement of the inner column 12b, the outer shaft 11a of the steering shaft 11 moves relative to the inner shaft 11b.

  As described above, the telescopic adjustment can be performed by expanding and contracting the steering column 12 by the electric telescopic mechanism 50. However, when the connecting rod 58 is moved by the electric motor 55, the impact absorbing member 60 is provided with the outer rod 58a and the outer rod 58a. Expansion and contraction between the inner rods 58b can be reliably prevented, and the outer rod 58a and the inner rod 58b can be integrated to move the connecting plate 57 in the vehicle longitudinal direction, and the inner column 12b can be moved in the vehicle longitudinal direction.

  However, when an impact load F is applied to the steering wheel 13 in the horizontal direction of the vehicle due to the secondary collision, the impact load F is first applied to the column axis direction component force Fx and the column axis direction perpendicular to the column axis direction. It is divided into component force Fy. Then, the inner column 12b and the outer shaft 11a are pushed to the left in the column axial direction as viewed in FIG. 5 by the column axial component force Fx, and the outer rod 58a of the connecting rod 58 is moved to the left via the connecting plate 57 accordingly. The column axial component force Fx is transmitted to the shock absorbing member 60 by being moved. When the column axial component force Fx transmitted to the shock absorbing member 60 reaches a set collapse load, the shock absorbing member 60 allows the outer rod 58a and the inner rod 58b to move relative to each other and enters the outer rod 58a. The inner rod 58b is inserted to ensure a predetermined collapse stroke as shown in FIG.

  In this way, when an impact load for moving the vehicle forward is applied to the steering wheel 13, until the column axial component force Fx reaches the collapse load, between the outer column 12 a and the inner column 12 b of the steering column 12. The sliding resistance of the connecting rod 58 is kept slight between the outer rod 58a and the inner rod 58b of the connecting rod 58 by the shock absorbing member 60.

  However, when the column axial component force Fx transmitted to the position of the shock absorbing member 60 becomes equal to or greater than the collapse load, the shock absorbing member 60 allows the outer rod 58a and the inner rod 58b to move relative to each other, thereby allowing the inner rod 58a to move into the inner rod 58a. 58b is gradually inserted, and the connecting rod 58 contracts. At this time, since the inner rod 58b is inserted into the outer rod 58a while applying a predetermined load to the inner rod 58b by the shock absorbing member 60, the impact energy can be absorbed. At this time, since the coating film 58d of the solid lubricant is formed on the outer peripheral surface of the inner rod 58b that is in sliding contact with the shock absorbing member 60, the coating film 58d of the solid lubricant is inserted in the process of inserting the inner rod 58b into the outer rod 58a. The solid lubricant film 58d is always present on the contact surface between the shock absorbing member 60 and the inner rod 58b, and the lubrication between the shock absorbing member 60 and the inner rod 58b. Can be performed satisfactorily. For this reason, when the impact absorbing member 60 and the inner rod 58b move relative to each other, the load is stabilized, the occurrence of stick-slip can be prevented, and the impact energy can be absorbed stably.

  On the other hand, the inner column 12b and the outer shaft 11a are slightly bent upward by the component force Fy in the direction perpendicular to the column axis of the impact load F, and the connecting plate 57 rigidly connected to the inner column 12b is also perpendicular to the inner column 12b. Moved together while keeping. As a result, a twisting occurs between the outer rod 58a and the inner rod 58b of the connecting rod 58 via the connecting plate 57. However, since the solid lubricant film 58d is formed on the inner rod 58b, the change in the lubrication state due to the twisting is prevented. Stable relative movement with a predetermined load can be secured, and impact energy can be absorbed stably.

  In the above-described embodiment, the case where the coating film 58d of the solid lubricant is formed on the inner rod 58b of the connecting rod 58 has been described. However, the present invention is not limited to this, and the solid lubricant is formed on the inner peripheral surface of the outer rod 58a. A film of solid lubricant may be formed on both the inner peripheral surface of the outer rod 58a and the outer peripheral surface of the inner rod 58b. Further, a solid lubricant film may be formed on the inner peripheral surface or the outer peripheral surface of the shock absorbing member 60.

  In the above embodiment, the case where the outer column 12a of the steering column 12 is fixed to the vehicle body side member 21 has been described. However, the present invention is not limited to this, and the inner column 12b is formed by the lower bracket 22 and the upper bracket 24. The steering wheel 13 may be attached to the vehicle body side member 21 and the outer column 12a side.

  Furthermore, in the above embodiment, the case where the outer rod 58a of the connecting rod 58 is directly fixed to the connecting plate 57 has been described. However, the present invention is not limited to this, and the pipe rod is connected to the outer rod 58a of the connecting rod and the connecting plate 57. You may make it connect via. In this case, when the column axial component force Fx is applied to the inner column 12b, it is possible to reliably prevent the bending moment that twists the connecting rod 58 generated in the connecting plate 57 from affecting the connecting rod 58. When the column axial component force Fx becomes equal to or greater than the collapse load, the relative movement between the outer rod 58a and the inner rod 58b of the connecting rod 58 can be further stabilized, and better impact energy absorption can be performed. it can.

  Furthermore, in the above embodiment, the case where the outer rod 58a and the inner rod 58b are connected by the shock absorbing member 60 formed in a ring shape having a corrugated cross section has been described. However, the shock absorbing member 60 is limited to the above configuration. Any configuration can be applied as long as the outer rod 58a and the inner rod 58b are relatively moved when an impact load equal to or greater than the set collapse load is transmitted. For example, a side view of the steering device is shown. As shown in FIG. 9, a synthetic resin pin 61 passing through both the outer rod 58a and the inner rod 58b of the connecting rod 58 is press-fitted, and this pin 61 is subjected to a column axial component force Fx caused by a secondary collision load. Is configured to break and collapse when the load exceeds the collapse load. It may be formed a film 58d of the solid lubricant on the outer circumferential surface of the outer rod 58a in sliding contact of Naroddo 58b. Also in this case, when the column axial component force Fx becomes equal to or greater than the collapse load and the inner rod 58b is inserted into the outer rod 58a, the lubricant film 58d always exists between the two. Stable relative movement can be ensured while applying a predetermined load, and good impact energy absorption can be performed. The solid lubricant coating may be formed on the inner peripheral surface of the outer rod 58a, or may be formed on both the inner peripheral surface of the outer rod 58a and the outer peripheral surface of the inner rod 58b.

Furthermore, in the above-described embodiment, the case where the connecting rod 58 is formed with the contracted portion constituted by the outer rod 58a and the inner rod 58b has been described. However, the present invention is not limited to this, and represents a cross-sectional view of the steering device. As shown in FIG. 10, a mounting portion 57a that extends the connecting plate 57 downward from the inner column 12b, and an intermediate portion 57b that extends from the lower end of the mounting portion 57a to the front side of the vehicle in parallel with the central axis of the steering column 12. The intermediate portion 57b is formed in a crank shape with the support portion 57c extending downward from the front end, and the support portion 57c is formed with an insertion hole 57d through which the connecting rod 58 is inserted. The shock absorption described above is formed in the insertion hole 57d. An impact absorbing member 62 having the same configuration as that of the member 60 is disposed and fixed with a locking nut 63, while The rod 58 has a configuration in which a small-diameter rod portion 58f and a large-diameter rod portion 58g are integrally formed. A male screw is formed on the small-diameter rod portion 58f and is screwed with the female screw 54b of the worm wheel 54. You may make it insert in the insertion hole 57d of the connection plate 57. FIG. Also in this case, the secondary collision load transmitted to the connecting plate 57 is formed by forming the solid lubricant film 58h on the outer peripheral surface of the connecting rod 58 that is in sliding contact with the insertion hole 57d of the connecting plate 57 in the large-diameter rod portion 58g. When the column axial component force Fx is greater than or equal to the collapse load, the shock absorbing member 62 allows relative movement between the connecting rod 58 and the connecting plate 57, so that the large-diameter rod portion 58 g of the connecting rod 58 is connected to the connecting plate 57. The connection plate 57 is inserted into the insertion hole 57d and allowed to move forward of the vehicle. At this time, since the solid lubricant film 58h always exists between the shock absorbing member 62 and the large-diameter rod portion 58g of the connecting rod 58, the connecting plate 57 is smoothly moved while applying a predetermined load. And stable absorption of impact energy can be performed.
Furthermore, although the case where the electric tilt mechanism 30 is provided has been described in the above embodiment, the present invention is not limited to this, and the electric tilt mechanism 30 is omitted and only the electric telescopic mechanism 50 is provided. Also good.

1 is an overall configuration diagram illustrating a state in which a steering device according to the present invention is mounted on a vehicle. It is a side view except a steering wheel of a steering column device. It is sectional drawing on the AA line of FIG. It is sectional drawing on the BB line of FIG. It is a longitudinal cross-sectional view of the principal part of a steering column apparatus. It is sectional drawing on the CC line of FIG. It is sectional drawing on the DD line of FIG. It is the longitudinal cross-sectional view similar to FIG. 5 at the time of contraction. It is the side view which made the cross section the principal part which shows other embodiment of this invention. It is a longitudinal cross-sectional view which shows other embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Steering column apparatus, 11 ... Steering shaft, 11a ... Outer shaft, 11b ... Inner shaft, 12 ... Steering column, 12a ... Outer column, 12b ... Inner column, 13 ... Steering wheel, 14, 16 ... Universal joint, 15 ... Intermediate shaft, 17 ... steering gear, 18 ... tie rod, 19 ... steering wheel, 21 ... vehicle body side member, 22 ... lower bracket, 24 ... upper bracket, 30 ... tilt mechanism, 50 ... telescopic mechanism, 51 ... gear housing, 54 ... Worm wheel, 55 ... electric motor, 56 ... worm, 57 ... connecting plate, 58 ... connecting rod, 58a ... outer rod, 58b ... inner rod, 58d ... solid lubricant coating, 58f ... small diameter rod portion, 58g ... large diameter rod portion 58h ... Solid lubricant Film, 60, 62 ... shock absorbing member, 61 ...... pin

Claims (5)

A steering column that has an outer column and an inner column that are relatively telescopically connected, and that rotatably supports a steering shaft to which a steering wheel is attached, one end of the steering column and the other end An electric actuator attached to the inner column and extending and contracting the outer column and the inner column, and the electric actuator contracts while generating a predetermined load in the axial direction when an impact load is input, An electric telescopic adjustment type steering device having a contraction part that absorbs
An electric telescopic adjustment type steering apparatus, wherein a solid lubricant film is formed on a contraction portion of the electric actuator.   The electric actuator according to claim 1, wherein the electric actuator includes a rod driven by an electric motor disposed in parallel with a predetermined offset amount with respect to a central axis of the inner column. Telescopic adjustable steering device.   The rod is inserted into an inner rod, an outer rod through which the inner rod is inserted so as to be relatively movable through a predetermined gap, and a corrugated unevenness is formed on the inner and outer peripheral surfaces of the inner rod and the outer rod. And a shock absorbing member that allows contraction of the inner rod and the outer rod while applying a predetermined load when a secondary collision load is applied, and solid-lubricating at least one sliding contact surface of the inner rod and the outer rod The electric telescopic adjustment type steering device according to claim 2, wherein a coating of an agent is formed.   The rod includes an inner rod, an outer rod that is inserted into the inner rod so as to be relatively movable while applying a predetermined load when a secondary collision load is applied, and a secondary collision interposed between the inner rod and the outer rod. 3. The electric telescopic adjustment type steering apparatus according to claim 2, further comprising a pin that breaks when a load is applied, and a solid lubricant film is formed on at least one sliding contact surface of the inner rod and the outer rod. .   The rod is screwed into a female screw formed on the inner peripheral surface of the worm wheel of the worm speed reduction mechanism, one end of which is connected to the electric motor, and the other end is fixed to one of the outer column and the inner column. 3. A solid lubricant film is formed on a sliding contact portion of the rod with the connecting member while applying a predetermined load when a secondary collision load is applied to the rod. The electric telescopic adjustment type steering device described in 1.

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