JP2008265419A - Support structure for vehicle steering column - Google Patents

Abstract

A vehicle steering system that makes a driver feel good while suppressing an increase in processing cost without increasing weight, and prevents the driver from feeling strange due to the generation of abnormal noise during telescopic operation. Provides column support structure.
SOLUTION: When a column side bracket 30 is reduced in diameter by a fastening operation of a fastening means 34 of a tilt telescopic mechanism 27, a first elasticity arranged at one lower portion of an inner peripheral surface of the column side bracket and an outer peripheral surface of an inner cylinder portion 12a1. The support member 53 is elastically compressed to bring the inner peripheral surface of the column side bracket into close contact with the outer peripheral surface of the inner cylinder portion. Further, when the fastening means releases the reduced diameter of the column side bracket, the first elastic support member lowers the friction coefficient with respect to the other lower portion of the inner peripheral surface of the column side bracket and the outer peripheral surface of the inner cylinder portion. Abuts slidably.
[Selection] Figure 4

Description

  The present invention relates to a support structure for a vehicle steering column having a tilt telescopic function for tilting or extending / contracting the steering column.

  In a vehicle steering device, a steering shaft is rotatably supported on a steering column arranged with an upward inclination toward the rear of the vehicle. A steering wheel is attached to the vehicle rear end of the steering shaft, and an intermediate shaft is connected to the vehicle front end of the steering shaft via a universal joint. A steering gear comprising a rack and pinion mechanism or the like is connected to the front end of the intermediate shaft via a universal joint, and the output shaft of the steering gear is connected to the left and right steering wheels via tie rods.

  The steering column includes a cylindrical lower column located on the front side of the vehicle and a cylindrical upper column mounted so as to move relative to the lower column in the axial direction. Is supported by a vehicle body side member such as a toe board, and the vehicle rear side of the upper column is supported by the vehicle body side member via a tilt telescopic mechanism that tilts (tilts) or expands and contracts (telescopically) the steering column. .

As a tilt telescopic mechanism, for example, a tilt telescopic mechanism described in Patent Document 1 is known.
The tilt telescopic mechanism disclosed in Patent Document 1 is integrally formed with a vehicle body side bracket fixed to a vehicle body side member so as to surround a vehicle front end side of an upper column built in the lower column from a vehicle width direction, and a vehicle rear end of the lower column. It is formed so as to wrap around the outer peripheral surface of the upper column inside the vehicle body side bracket, and it is formed so as to intersect the vehicle side bracket and the column side bracket that is provided with a slit in the axial direction so that the diameter can be reduced. The tightening shaft that passes through the vertical and horizontal holes and contacts the outer periphery of the column-side bracket, and rotating the tightening shaft in the forward and reverse directions reduces the diameter of the column-side bracket during tightening, and the column-side bracket during tilt telescopic And an operation lever for returning the diameter to the original diameter.
JP 2004-82868 A

  By the way, the vehicle steering device has to improve the column rigidity and the natural vibration characteristics to improve the driver's steering feeling. However, the tilt telescopic mechanism of Patent Document 1 is in close contact with each other in order to improve the above-described characteristics. Thus, if the inner peripheral surface of the column side bracket and the outer peripheral surface of the upper column are processed with high accuracy, there is a problem in terms of processing costs. In order to increase column rigidity and natural vibration characteristics, it is conceivable to increase the thickness of the upper column and the column side bracket, but there is a possibility that the tilt telescopic operability is deteriorated due to an increase in weight.

In addition, the device of Patent Document 1 slides on the inner peripheral surface of the column side bracket and the outer peripheral surface of the upper column during telescopic operation, and generates an unpleasant noise such as a rubbing sound. There is.
Therefore, the present invention has been made paying attention to the above-described conventional unsolved problems, and can improve the driver's steering feeling while suppressing an increase in processing cost without increasing the weight. Another object of the present invention is to provide a support structure for a vehicle steering column that prevents the generation of strange noise during telescopic operation and prevents the driver from feeling uncomfortable.

  In order to achieve the above object, a vehicle steering column support structure according to claim 1 includes a steering column for rotatably supporting a steering shaft, a first column located at the rear of the vehicle, and a column in the first column. A second column that is slidably fitted in the axial direction and is positioned in front of the vehicle, and the first column is supported by a vehicle body side member disposed above the vehicle via a tilt telescopic mechanism. In the steering column support structure, the tilt telescopic mechanism is an outer cylinder portion of the fitting portion that surrounds the inner cylinder portion of the fitting portion of the first column and the second column so that the diameter can be reduced. A certain column side bracket, a vehicle body side bracket which is disposed so as to face the column side bracket from the outside in the vehicle width direction and is fixed to the vehicle body side member, and the vehicle body Mounted on a bracket, the first column and the second column are fastened by reducing the diameter of the column side bracket, or the column side bracket is movable in the vehicle longitudinal direction and the vertical direction. Fastening means for releasing the reduced diameter of the bracket, and when the fastening means releases the reduced diameter of the column side bracket at one lower part of the inner peripheral surface of the column side bracket and the outer peripheral surface of the inner cylinder part Further, the column-side bracket is slidably contacted with the lower part of the inner peripheral surface of the column-side bracket and the outer peripheral surface of the inner cylinder portion with a lower coefficient of friction, while the fastening means is tightened. When the diameter is reduced, a first elastic support member is provided that elastically compresses the inner peripheral surface of the column side bracket to closely contact the outer peripheral surface of the inner cylinder portion.

According to a second aspect of the present invention, in the vehicle steering column support structure according to the first aspect, the first elastic support member is a synthetic resin material that is elastically deformable and has a low friction coefficient.
According to a third aspect of the present invention, in the vehicle steering column support structure according to the first or second aspect, the steering column is arranged with an upward inclination toward the rear of the vehicle. In the event of a secondary collision of the vehicle, there is provided an impact absorbing portion for moving the first column forward of the vehicle together with the tilt telescopic mechanism to absorb impact force, and an inner peripheral surface of the column side bracket and the inner cylinder portion A friction coefficient is lowered to one upper part of the outer peripheral surface of the column-side bracket and the other upper part of the outer peripheral surface of the inner cylinder portion so as to be slidable and elastically compressed. Thus, the second elastic support member that absorbs the impact force was disposed.

  Furthermore, the invention according to claim 4 is the vehicle steering column support structure according to claim 3, wherein the second elastic support member is a synthetic resin material that is elastically deformable and has a low friction coefficient.

  According to the vehicle steering column support structure of the present invention, when the diameter of the column side bracket is reduced by the fastening operation of the fastening means of the tilt telescopic mechanism, one lower portion of the inner peripheral surface of the column side bracket and the outer peripheral surface of the inner cylinder portion Since the first elastic support member arranged on the inner surface is elastically compressed to bring the inner peripheral surface of the column side bracket into close contact with the outer peripheral surface of the inner cylinder portion, the first column and the second column are securely tightened. The natural vibration characteristic can be enhanced to improve the driver's steering feeling. Further, since the column rigidity and the natural vibration characteristics can be improved without increasing the wall thickness, that is, without increasing the weight, the operability can be improved when a manual tilt retesco mechanism is used.

  When the fastening means releases the reduced diameter of the column side bracket, the first elastic support member disposed at one lower portion of the inner peripheral surface of the column side bracket and the outer peripheral surface of the inner cylinder portion Since the friction coefficient is lowered and the slidable contact is made with the other lower part of the outer peripheral surface of the surface and the inner cylinder portion, the telescopic operability of the tilt retesco mechanism can be improved.

Hereinafter, the best mode for carrying out the present invention (hereinafter referred to as an embodiment) will be described in detail with reference to the drawings.
FIG. 1 is a diagram schematically illustrating an embodiment of a vehicle according to the present invention, in which a steering device 10 is disposed to be inclined at a predetermined angle so as to rise rearward of the vehicle with respect to the horizontal direction of the vehicle. A steering column 12 that rotatably supports the steering shaft 11 is provided. 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 through a universal joint 16 at the front end thereof. The output shaft of the steering gear 17 is connected to the steering wheel 19 via a tie rod 18.

  When the driver steers the steering wheel 13, the rotational force is transmitted to the steering gear 17 through the steering shaft 11, the universal joint 14, the intermediate shaft 15, and the universal joint 16, and the rotational motion is transmitted to the vehicle by the rack and pinion mechanism. The steering wheel 19 is steered through the tie rod 18 after being converted into a linear motion in the width direction. Note that peripheral components P such as a combination switch and a column cover are disposed behind the steering column 12 in the vehicle.

(First embodiment)
2 to 7 show a first embodiment of a steering column support structure according to the present invention, FIG. 2 is a side view showing the first embodiment, and FIG. 3 is a plan view of the first embodiment. FIG. 4 is a cross-sectional view of the main part showing the tilt telescopic mechanism of the first embodiment. 5 is a view taken along the line AA in FIG. 2, FIG. 6 is a support member made of rigid resin arranged at the uppermost portion of the inner periphery of the first column side bracket, and FIG. 7 is an inner periphery of the first column side bracket. It is a figure which shows the rigid resin-made support member arrange | positioned in the lowest part.

  As shown in FIG. 2, the steering column 12 is composed of a lower column 12a and a hollow upper column 12b that is slidably fitted to the lower column 12a. The lower column 12a has a hollow first lower column 12a1 whose rear end is fitted in the upper column 12b, and a rear end of the vehicle is slidably fitted in the first lower column 12a1. The second lower column 12a2 has a hollow shape with a cap 20 attached to the outer periphery. The cap 20 is inserted into the support hole 22 of the toe board 21 from the rear side of the vehicle body, and inserted into the front of the second lower column 12a2. The end is supported by the toe board 21. When an external force directed toward the front of the vehicle is input to the first lower column 12a1, the fitting force of the first lower column 12a1 and the second lower column 12a2 slides in the direction of the column axis P1 and slightly absorbs the aforementioned external force. Yes.

The steering shaft 11 has a hollow outer shaft 11a with a steering wheel 13 (not shown) attached to the rear end of the vehicle, and, as shown in FIG. 4, is splined or serrated to the outer shaft 11a and slidable. And a solid inner shaft 11b engaged with the inner shaft 11b.
In this steering shaft 11, an outer shaft 11a is rotatably supported by an upper column 12b via a rolling bearing (not shown), and a vehicle front end portion of the inner shaft 11b is connected to a lower column 12a via a rolling bearing (not shown). Is supported rotatably.

The upper column 12b is supported on the vehicle body side member 23 via a manual tilt telescopic mechanism 27 described later.
The tilt telescopic mechanism 27 is formed on the vehicle front side of the upper column 12b and includes a column side bracket 30 that holds the outer periphery of the lower column 12a (first lower column 12a1), and a column side bracket fixed to the vehicle body side member 23. Vehicle body side bracket 31 sandwiching 30 from outside in the vehicle width direction, and first and second friction plates disposed between the side surfaces of column side bracket 30 and vehicle body side bracket 31 facing each other in the vehicle width direction 32a, 32b, a third friction plate 32c disposed between the first and second friction plates 32a, 32b, and a tightening portion 34 for fastening the vehicle body side bracket 31 to the column side bracket 30 side. Yes.

  As shown in FIG. 2, the column side bracket 30 includes a first column side bracket 30a formed in an annular shape so as to surround the outer periphery of the lower column 12a (first lower column 12a1) at the vehicle front end portion of the upper column 12b. The second column side bracket 30b is formed on the rear side of the vehicle via a semicircular circumferential slit 35 with respect to the first column side bracket 30a.

  As shown in FIGS. 4, 6, and 7, the first column side bracket 30 a has a recess 50 formed in the uppermost inner periphery thereof and a recess 51 formed in the lowermost inner periphery thereof. Then, support members 52 and 53 made of a synthetic resin that is elastically deformable and has a low friction coefficient are press-fitted into the recesses 50 and 51 in a state of being in contact with the outer periphery of the first lower column 12a1. The support members 52 and 53 are made of PTFE (polytetrafluoroethylene) resin, PP (polypropylene) resin, POM (polyoxymethylene) resin, urethane resin, or the like.

  As shown in FIG. 5, the second column side bracket 30b includes a cylindrical portion 30b1 formed in the lower half portion and a pair of vehicle width direction displacement portions 30b2, which are formed in the upper half portion and are spaced apart from each other in the vehicle width direction. 30b3. The cylindrical portion 30b1 holds the outer periphery of the lower column 12a. The pair of vehicle width direction displacement portions 30b2 and 30b3 are formed apart from each other in the vehicle width direction by providing a slit 30d at the top of the cylindrical portion 30b1 along the column axis P1 direction. Telescopic long holes 30e and 30f whose long axes extend in the direction of the column axis P1 are formed in the portions 30b2 and 30b3.

  As shown in FIG. 5, the vehicle body side bracket 31 includes a flange 31a fixed to the vehicle body side member 23 and a pair of side plates 31b and 31c extending downward from the flange 31a and spaced apart in the vehicle width direction. And. A detachment capsule 36 is fitted to the flange 31a at the end on the vehicle rear side, and a bolt through hole 36a is formed in the detachment capsule 36. The pair of side plates 31b and 31c is formed with a tilt long hole 37 whose major axis extends in the vertical direction. Further, the flange 31 a is attached to the vehicle body side member 23 by screwing a fixing bolt (not shown) penetrating the bolt through hole 36 a from below the detachment capsule 36 into the vehicle body side member 23.

  As shown in FIG. 3, the first and second friction plates 32 a and 32 b are members that are bent into a U-shape in plan view. The first friction plate 32a has a pair of parallel portions 32a1 and 32a2 extending in parallel with each other, and a connecting portion 32a3 that connects end portions in the longitudinal direction of the pair of parallel portions 32a1 and 32a2. The second friction plate 32b is bent in a U-shape smaller than the first friction plate 32a, and a pair of parallel portions 32b1 and 32b2 extending in parallel with each other, and the pair of parallel portions 32b1 and 32b2 in the longitudinal direction. It has the connection part 32b3 which connects an edge part. Telescopic elongated holes (reference numeral 38 in FIG. 2) are formed in the parallel portions 32a1 and 32a2 of the first friction plate 32a and the parallel portions 32b1 and 32b2 of the second friction plate 32b.

  And the 2nd friction board 32b arrange | positioned inside the 1st friction board 32a is piled up in the state which matched each other telescopic long hole, and the vehicle front side of parallel part 32a1, 32a2, 32b1, 32b2 is column side bracket. 30 vehicle width direction displacement portions 30b2 and 30b3 are disposed between side surfaces facing the vehicle width direction and side plates 31b and 31c of the vehicle body side bracket 31 (see FIG. 5), and vehicles having parallel portions 32a1, 32a2, 32b1 and 32b2 The rear side is fixed to the column side bracket 30 via a fixing bolt 39.

  Further, as shown in FIG. 5, the third friction plate 32c is a member bent into a substantially inverted U shape when viewed from the rear of the vehicle, and extends in the vertical direction in parallel to each other to form a circular bolt insertion hole. The pair of parallel portions 32c1 and 32c2 and a connecting portion 32c3 for connecting the upper portions of the pair of parallel portions 32c1 and 32c2 are provided. The parallel portion 32c1 of the third friction plate 32c is disposed between one parallel portion 32a1 and 32a2 of the first and second friction plates 32a and 32b, and the parallel portion 32c2 is the first and second friction plates. 32a and 32b are arranged so as to be sandwiched between the other parallel portions 32b1 and 32b2.

As shown in FIGS. 3 and 5, the tightening portion 34 includes a tilt long hole 37 of the vehicle body side bracket 31, telescopic long holes 38 of the first and second friction plates 32a and 32b, and bolt insertion holes of the third friction plate 32c. , And a fastening rod 34a inserted through the telescopic elongated holes 30e and 30f of the column side bracket 30, a fixed cam 34b, a movable cam 34c and an adjusting nut 34d that are externally fitted on the screw side of the fastening rod 34a, and a movable cam And an operation lever 34e fixed to 34c.
Here, the first column of the claims corresponds to the upper column 12b, the second column of the claims corresponds to the first lower column 12a1, and the inner cylinder portion of the fitting portion of the claims is the vehicle rear of the first lower column 12a1. The first elastic support member of the claim corresponds to the support member 53, the second elastic support member of the claim corresponds to the support member 52, the fastening means of the claim corresponds to the tightening portion 34, The shock absorbing portion of the claims corresponds to the flange 31a of the vehicle body side bracket 31 and the capsule 36 for detachment.

Next, operations and effects of the vehicle steering apparatus 10 according to the present embodiment will be described.
In order to perform the tilt telescopic adjustment, first, the operation lever 34e of the tightening portion 34 is rotated in a direction in which the pair of vehicle width direction displacement portions 30b2 and 30b3 are separated from each other. Thus, the force in the direction in which the pair of vehicle width direction displacement portions 30b2 and 30b3 are brought close to each other via the side plates 31b and 31c of the vehicle body side bracket 31 is released, and the second column side bracket 30b and the vehicle body side bracket of the column side bracket 30 are released. The frictional force between the first to third friction plates 32a to 32c disposed between 31 is released, and the tightening of the cylindrical portion 30b1 to the lower column 12a (first lower column 12a1) is also released.

At this time, the support member 53 disposed below the first column side bracket 30a is crushed while being elastically deformed to the first lower column 12a1 when the cylindrical portion 30b1 is tightening the first lower column 12a1. However, when the tightening is released, the crushed shape is restored.
Then, the steering wheel 13 is tilted by sliding the tightening rod 34 a in the major axis direction of the tilt long hole 37 of the vehicle body side bracket 31.

Further, the column side bracket 30 is moved relative to the first lower column 12a1 in the longitudinal direction of the vehicle while sliding the tightening rod 34a in the longitudinal direction of the telescopic elongated holes 30e and 30f of the column side bracket 30. Perform expansion and contraction.
When the steering wheel 13 is expanded and contracted, the first lower column 12a1 is low in friction with respect to the support member 53 disposed at the lowermost portion of the first column side bracket 30a of the column side bracket 30 in the vehicle front-rear direction. And the contact portion between the outer peripheral surface of the first lower column 12a1 and the inner peripheral surface of the column side bracket 30 (second column side bracket 30b) is reduced, so that an unpleasant noise such as a rubbing noise is suppressed. Telescopic operation is performed smoothly.

  Then, when the operation lever 34e of the tightening portion 34 is rotated so that the pair of vehicle width direction displacement portions 30b2 and 30b3 are close to each other via the side plates 31b and 31c of the vehicle body side bracket 31, the column side bracket 30 and the vehicle body side bracket are rotated. While the frictional force is generated between the contact surfaces of the first to third friction plates 32a to 32c disposed between 31, the lower column 12a is tightened by the cylindrical portion 30b1.

  At this time, the support member 53 disposed below the first column side bracket 30a is crushed while being elastically deformed to the first lower column 12a1, and the inner peripheral surface of the column side bracket 30 and the outer peripheral surface of the first lower column 12a1 And the tightening is ensured, and the movement of the steering column 12 in the direction of the column axis P1 and the movement in the vertical direction are restricted, and the tilt telescopic adjustment is completed.

  On the other hand, when an impact force directed toward the front of the vehicle is input to the steering wheel 13 at the time of a secondary collision of the vehicle, an impact force toward the front of the vehicle is input to the vehicle body side bracket 31 that supports the upper column 12b on the vehicle body side member 23. To do. At this time, the vehicle rear side of the flange 31a of the vehicle body side bracket 31 is fixed to the vehicle body side member 23 via the release capsule 36, and an impact force to the vehicle front side is input to the flange 31a. At this time, the flange 31a comes out of the detachment capsule 36 and moves forward, and a collapse stroke is performed in which the first lower column 12a1 slides forward in the vehicle at the fitting portion with the second lower column 12a2. The impact force at the time of the next collision is absorbed.

  At this time, the steering shaft 11 is supported by a steering column 12 that is disposed at a predetermined angle so as to rise rearward of the vehicle with respect to the horizontal direction of the vehicle, and a steering wheel 13 attached to the rear end of the steering shaft 11. Since a substantially horizontal impact force is input during the secondary collision, the integrally connected flange 31a (vehicle body side bracket 31) and the upper column 12b that move forward of the vehicle are bent with respect to the first lower column 12a1. Input external force.

  Here, in the present embodiment, the support member 52 disposed at the uppermost portion of the first column side bracket 30a of the column side bracket 30 causes the first lower column 12a1 by the bending external force input from the vehicle body side bracket 31 and the upper column 12b. Since it slides with low friction against the first lower column 12a1 while absorbing the bending external force by being abutted and crushed and elastically deformed, the collapse stroke at the time of the secondary collision is smoothly performed.

  Therefore, in the apparatus of this embodiment, when the column side bracket 30 tightens the first lower column 12a1, the support member 53 disposed at the lower part of the first column side bracket 30a is elastically deformed to the first lower column 12a1. As a result of being crushed, the inner peripheral surface of the column side bracket 30 and the outer peripheral surface of the first lower column 12a1 are brought into close contact with each other, and tightening is ensured, so that the column rigidity and natural vibration characteristics are improved to improve the driver's steering feeling. be able to.

Further, the apparatus of the present embodiment does not increase the thickness of the first lower column 12a1, the column side bracket 30, and the vehicle body side bracket 31 in order to increase the column rigidity and the natural vibration characteristics. Telescopic operability can be improved.
In the telescopic operation, the first lower column 12a1 slides in the vehicle front-rear direction with low friction with respect to the support member 53 disposed at the lowermost portion of the first column-side bracket 30a of the column-side bracket 30. Since the contact portion between the outer peripheral surface of the first lower column 12a1 and the inner peripheral surface of the column side bracket 30 (second column side bracket 30b) is reduced and harsh noises such as rubbing noises are suppressed, the driver during telescopic operation There is no risk of feeling uncomfortable.

  Further, at the time of a secondary collision of the vehicle, the support member 52 disposed at the uppermost portion of the first column side bracket 30a of the column side bracket 30 causes the first lower column by the bending external force input from the vehicle body side bracket 31 and the upper column 12b. 12a1 is pressed and crushed and elastically deformed to absorb bending external force and slide against the first lower column 12a1 with low friction, so that the collapsing operation at the time of the secondary collision can be performed smoothly. .

(Second Embodiment)
FIG. 8 is a second embodiment showing a structure of the first column side bracket 30a different from FIG.
In the present embodiment, a through hole 54 penetrating in the vertical direction is formed at the uppermost portion of the first column side bracket 30 a, and a female screw 55 is formed at the upper inner periphery of the through hole 54. Then, the support member 52 is inserted into the through hole 54, and the screw member 56 is screwed into the female screw 55, so that the support member 52 is in contact with the outer peripheral surface of the first lower column 12a1 and is compressed and deformed.

The support member 52 of the present embodiment is also pressed against the first lower column 12a1 by the bending external force input from the vehicle body side bracket 31 and the upper column 12b, and is crushed and elastically deformed to absorb the bending external force, while the first lower column. It slides with low friction with respect to 12a1, and the collapse stroke at the time of a secondary collision can be performed smoothly.
In addition, although not shown in figure, the support member 53 arrange | positioned at the lowest part of the 1st column side bracket 30a is also inserted into the through-hole penetrated to an up-down direction, and the state compressed by the screw member screwed in the through-hole Even if it arrange | positions by, the effect similar to the structure shown in FIG. 7 can be show | played.

Further, when the support members 52 and 53 of each of the above embodiments are made of an oil-containing synthetic resin or a synthetic resin containing a low friction material, the friction coefficient is further reduced, and during the collapsing operation and telescopic operation at the time of the secondary collision. The operation can be further improved.
Moreover, in the said embodiment, although the supporting members 52 and 53 were arrange | positioned in the inner periphery of the uppermost part and the lowest part of the 1st column side bracket 30a, the summary of this invention is not limited to this, The 1st lower column Support members 52 and 53 may be disposed on the outer periphery of the uppermost part and the lowermost part of 12a1, and these support members 52 and 53 may abut against the inner peripheral surface of the first column side bracket 30a to be elastically deformed.

  In the present embodiment, the first lower column 12a1 is fitted into the upper column 12b. However, the gist of the present invention is not limited to this, and the upper column 12b is fitted into the first lower column 12a1. It may be a structure.

It is the schematic of the steering mechanism part of the motor vehicle carrying the steering column apparatus which concerns on this invention. 1 is a side view showing a vehicle steering apparatus according to a first embodiment of the present invention. It is a top view which shows the steering device for vehicles of 1st Embodiment. It is principal part sectional drawing which shows the tilt telescopic mechanism of 1st Embodiment. It is an AA arrow directional view of FIG. It is a BB line arrow directional view of FIG. It is a principal part enlarged view of FIG. It is a principal part enlarged view of 2nd Embodiment which concerns on this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Steering device for vehicles, 11 ... Steering shaft, 11a ... Outer shaft, 11b ... Inner shaft, 12 ... Steering column, 12a ... Lower column, 12a1 ... First lower column, 12a2 ... Second lower column, 12b ... Upper column, 13 ... Steering wheel, 14 ... Universal joint, 15 ... Intermediate shaft, 16 ... Universal joint, 17 ... Steering gear, 18 ... Tie rod, 19 ... Steering wheel, 20 ... Cap, 21 ... Toe board, 22 ... Support hole, 23 ... Car body side member 27 ... Tilt telescopic mechanism, 30 ... Column side bracket, 30a ... First column side bracket, 30b ... Second column side bracket, 30b1 ... Cylindrical part, 30b2, 30b3 ... Vehicle width direction displacement part, 30d ... Slit, 30e , 30f ... Teles Long hole 31 ... Body side bracket, 31a ... Flange, 31b, 31c ... Side plate, 32a ... First friction plate, 32b ... Second friction plate, 32c ... Third friction plate, 34 ... Tightening part, 34a ... Rod, 34b ... fixed cam, 34c ... movable cam, 34d ... adjustment nut, 34e ... operation lever, 35 ... circumferential slit, 36 ... release capsule, 36a ... bolt through hole, 37 ... tilt slot, 38 ... telescopic slot, 39 ... Fixing bolt, 50, 51 ... Recess, 52, 53 ... Support member, 54 ... Through hole, 55 ... Female screw, 56 ... Screw member, P ... Peripheral parts, P1 ... Column shaft

Claims (4)

A steering column that rotatably supports a steering shaft is composed of a first column located at the rear of the vehicle, and a second column that is slidably fitted to the first column in the column axial direction and located at the front of the vehicle. In the vehicle steering column support structure, the first column is supported by a vehicle body side member disposed above the vehicle via a tilt telescopic mechanism.
The tilt telescopic mechanism includes a column-side bracket that is an outer cylinder portion of the fitting portion that surrounds the inner cylinder portion of the fitting portion of the first column and the second column so that the diameter can be reduced, and the column A vehicle body side bracket that is disposed to face the side bracket from the outside in the vehicle width direction and is fixed to the vehicle body side member, and is attached to the vehicle body side bracket, and the column side bracket is reduced in diameter to reduce the first side. Fastening means for fastening one column and the second column, or releasing the reduced diameter of the column side bracket so that the column side bracket can move in the vehicle longitudinal direction and the vertical direction;
An inner peripheral surface of the column side bracket and an inner surface of the inner surface of the column side bracket when the fastening means releases the reduced diameter of the column side bracket on one lower part of the inner peripheral surface of the column side bracket and the outer peripheral surface of the inner cylinder portion. While lowering the friction coefficient to the other lower portion of the outer peripheral surface of the cylindrical portion and slidably contacting, when the column side bracket is reduced in diameter by the fastening operation of the fastening means, A support structure for a steering column for a vehicle, wherein a first elastic support member is disposed to bring an inner peripheral surface of a column side bracket into close contact with an outer peripheral surface of the inner cylinder portion.   2. The vehicle steering column support structure according to claim 1, wherein the first elastic support member is a synthetic resin material that is elastically deformable and has a low friction coefficient. The steering column is arranged with an upward inclination toward the rear of the vehicle, and the vehicle body side bracket moves the first column to the front of the vehicle together with the tilt telescopic mechanism in the event of a secondary collision of the vehicle. While providing a shock absorbing part to absorb,
The coefficient of friction is lowered at one upper part of the inner peripheral surface of the column side bracket and the outer peripheral surface of the inner cylinder part with respect to the other upper part of the inner peripheral surface of the column side bracket and the outer peripheral surface of the inner cylinder part. 3. The vehicle steering column support structure according to claim 1, further comprising a second elastic support member that is slidably contacted and elastically compresses to absorb an impact force.   4. The vehicle steering column support structure according to claim 3, wherein the second elastic support member is a synthetic resin material that is elastically deformable and has a low friction coefficient.

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