JP2011068164A - Sealing structure of column hole - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sealing structure of a column hole capable of reliably preventing ingress of dust and noise in a cabin. <P>SOLUTION: A cross member 2 is joined with a dash panel 1 and a closed section is formed of the dash panel 1 and the cross member 2. A first column hole H1 is formed in the cross member 2, and a second column hole H2 is formed in the dash panel 1. The sealing structure has a first sealing member 10 which is fitted to a steering gear box 5 to seal a space between the steering gear box 5 and a circumferential edge part of the first column hole H1 of the cross member 2, and a second sealing member 14 which is fitted to the dash panel 1 to seal a space between the first sealing member 10 and a circumferential edge part of the second column hole H2. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a seal structure for a column hole of a dash panel through which a steering column is disposed.

  In the above column hole seal structure, as disclosed in Patent Document 1, a single seal member is fitted into the steering gear box and seals between the steering gear box and the peripheral portion of the column hole of the dash panel. It was only provided.

JP 2007-223378 A

According to the above-described conventional structure, the seal is sufficient because only the single seal member that fits into the steering gear box and seals between the periphery of the column hole of the steering gear box and the dash panel is provided. Rather, dust and sound sometimes entered the passenger compartment from the engine room side through the column hall.
An object of the present invention is to provide a column hole sealing structure capable of reliably preventing dust and sound from entering a vehicle interior.

The feature of the present invention is that
A column hole seal structure of a dash panel through which a steering column is disposed,
A cross member is joined to the dash panel to form a closed cross section with the dash panel and the cross member,
A first column hole is formed in the cross member and a second column hole is formed in the dash panel;
A first seal member that fits into a steering gear box and seals between the steering gear box and a peripheral portion of the first column hole of the cross member;
The second seal member is provided on the dash panel and seals between the first seal member and a peripheral portion of the second column hole. (Claim 1)

According to this configuration, the first seal member fitted to the steering gear box seals between the steering gear box and the peripheral edge of the first column hole of the cross member, and further, the second seal member attached to the dash panel Since the gap between the first seal member and the peripheral edge of the second column hole is sealed, the sealing performance can be improved sufficiently, and dust and sound can enter the vehicle compartment from the engine room side through the column hole. It can be surely prevented.
Further, since the first seal member and the second seal member are brought into contact to seal the space in the cross member and the vehicle interior, the sealing performance can be improved without impairing the assembly property of the steering column. (Claim 1)

In the present invention,
The peripheral edge of the first column hole is inclined so that the vehicle front side is the upper side,
The first seal member includes a fitting tube portion that fits into the steering gear box, and an annular first lip that has one end in the axial direction continuous to the fitting tube portion. The other end in the axial direction is in pressure contact with the peripheral edge of the first column hole,
As the first seal member fitted to the steering gear box is assembled to the dash panel and cross member side from below, the other end portion of the first lip is guided to the peripheral side of the first column hole. A guide portion is provided on the vehicle front side upper portion of the first lip,
When the guide portion projects from the upper portion of the first lip on the vehicle front side to the radially outer side of the first lip along the panel surface of the cross member, the following effects can be achieved. (Claim 2)

The other end of the first lip of the first seal member in the axial direction is pressed against the peripheral edge of the first column hole of the cross member inclined so that the front side of the vehicle is on the upper side. Seal the gap.
In the automobile assembly process, after the first seal member is assembled to the steering gear box of the steering apparatus, the steering apparatus is assembled to the vehicle body provided with the dash panel and the cross member ascending and approaching from below. In this case, the surface of the peripheral edge of the first column hole is inclined with respect to the approach direction (vertical direction) to the dash panel or the like of the steering device (inclined so that the vehicle front side is on the upper side). If the positions in the front-rear direction are misaligned, the other end portion (upper end portion) of the first lip in the axial center direction may enter the first column hole or be caught by the peripheral portion of the first column hole.

  On the other hand, in the present invention, as the first seal member fitted to the steering gear box is assembled to the dash panel and the cross member side from below, the other end of the first lip is connected to the peripheral side of the first column hole. Since the first seal member is provided with a guide portion for guiding the first lip, the guide portion is provided on the vehicle front side upper portion of the first lip which is easily caught by the peripheral edge portion of the first column hole. As a result, it is possible to prevent the other end of the first column hole from entering the first column hole and the other end of the first lip from being caught by the peripheral edge of the first column hole.

  There is a method of making the first lip larger than the diameter of the first column hole as a method for avoiding the entry of the first lip into the first column hole and the catching on the peripheral edge of the first column hole. In the method, the first seal member is enlarged, and it is necessary to provide a wide seal surface at the periphery of the first column hole. In addition, the seal length is increased, the seal surface pressure is lowered, and the seal performance is deteriorated.

  On the other hand, according to the above configuration of the present invention, the first seal member can be reduced in size, and it is not necessary to provide a wide seal surface at the peripheral edge of the first column hole, and the seal length is increased. Therefore, it is possible to avoid the deterioration of the sealing performance due to the bottom of the seal surface pressure. (Claim 2)

In the present invention,
The peripheral edge of the second column hole is inclined so that the vehicle front side is the upper side,
When the second column hole is displaced toward the vehicle front side with respect to the first column hole, the following effects can be obtained. (Claim 3)

For example, in a structure in which the first column hole and the second column hole are positioned concentrically (in a state where they are formed concentrically when viewed from the vertical direction on the panel surface), a steering gear in which the first seal member is assembled. When assembling the box to a dash panel, etc., the shaft center on the upper end side of the steering gear box is on the front side of the vehicle with respect to the shaft center of the second column hole (straight line passing through the center of the second column hole perpendicular to the panel surface). Since the steering gear box is assembled in an inclined state, the distance between the outer peripheral surface of the steering column and the inner peripheral edge portion of the second column hole on the vehicle front side is shortened.
On the other hand, according to the above-described configuration of the present invention, the second column hole is displaced toward the vehicle front side with respect to the first column hole. The distance from the inner peripheral edge portion on the side can be increased, the steering column can be made difficult to interfere with the inner peripheral edge of the second column hole, and the assembling property can be improved. (Claim 3)

In the present invention,
The guide portion is formed in an arc shape along the circumferential direction of the first lip,
The guide surface of the guide portion is formed in an arc-shaped projecting curved surface in a longitudinal section,
As the first seal member fitted to the steering gear box is assembled to the dash panel and the cross member side from below, the guide portion moves the peripheral edge portion of the first column hole to the diameter of the first column hole. When the other end portion of the first lip is guided toward the peripheral edge side of the first column hole while sliding toward the outer side in the direction, the following action can be obtained. (Claim 4)

  As the first seal member fitted to the steering gear box is assembled to the dash panel and cross member side from below, the guide portion moves the peripheral edge of the first column hole to the radially outer side of the first column hole. The other end portion of the first lip is guided toward the peripheral edge side of the first column hole while sliding toward it. Since the guide portion is formed in an arc shape along the circumferential direction of the first lip, and the guide surface of the guide portion is formed in an arc-shaped projecting curved surface in the longitudinal section, when the guide portion contacts the cross member It can begin to slide smoothly, and the other end portion of the first lip can be smoothly guided to the peripheral edge side of the first column hole. (Claim 4)

In the present invention,
The second seal member is annularly formed and attached to the second column hole;
The first seal member includes an annular second lip located radially inward of the first lip;
The second lip has one end portion in the axial direction continuous to the fitting tube portion, and when the other end portion in the axial direction passes through the first column hole and presses against the second seal member, Can be played. (Claim 5)

The shape of the second seal member can be simplified and the assemblability can be improved.
Further, by attaching the second seal member to the second column hole, the second seal member becomes a protective member, and damage due to contact between the steering column and the dash panel can be avoided. As a result, the diameter of the second column hole of the dash panel can be reduced, the diameter of the second lip can be reduced, and the second lip can be easily inserted into the first column hole. Thereby, assembly | attachment property can be improved. (Claim 5)

In the present invention,
The first seal member can reinforce the first lip and the second lip by including a first rib that connects the inner peripheral surface of the first lip and the outer peripheral surface of the second lip. And the stability of the press-contact position with respect to the peripheral part of the 2nd lip of the 2nd lip and press-contact force are secured, and seal performance can be improved. (Claim 6)

In the present invention,
The first seal member includes a second rib that connects the outer peripheral surface of the first lip and the lower surface of the guide portion,
The first rib and the second rib are located at the same position in the circumferential direction of the first seal member;
When a plurality of ribs composed of the first ribs and the second ribs are provided radially with respect to the axial center of the first seal member, the following effects can be achieved. (Claim 7)

Since the first seal member includes the second rib connecting the outer peripheral surface of the first lip and the lower surface of the guide portion, the guide portion can be reinforced, and the other end portion of the first lip can be connected to the guide portion. It can guide more smoothly.
Further, the first rib and the second rib are located at the same position in the circumferential direction of the first seal member, and a plurality of ribs composed of the first rib and the second rib are provided radially with respect to the axis of the first seal member. Therefore, the first lip, the second lip, and the guide portion can be reinforced more reliably. (Claim 7)

According to the present invention,
It was possible to provide a column hole seal structure that can reliably prevent dust and sound from entering the passenger compartment.

Perspective view showing the dash panel and the surrounding structure Longitudinal section of column hole seal structure The perspective view which looked at the 1st seal member from the fitting cylinder part side The perspective view which looked at the 1st seal member from the other end part of the axial direction of the 1st lip The figure which shows the state in the middle of the assembly of the steering gear box

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, front and rear, upper and lower in an explanatory note show the direction in the state mounted in the vehicle. 1 and 2 show a seal structure of a column hole of a dash panel 1 through which a steering column of an automobile is disposed. The dash panel 1 divides the engine room from the vehicle interior, and the upper half is formed of a substantially vertical wall 1S, and the lower half is formed of an inclined wall 1K that is lowered rearward.

  In addition, the upper and lower ends of the cross member 2 which is long in the vehicle width direction are welded and joined from the vehicle front side Fr near the connecting portion between the vertical wall 1S and the inclined wall 1K of the dash panel 1 and are closed by the dash panel 1 and the cross member 2. A cross section is formed. Thereby, the strength of the connecting portion is increased.

  The cross member 2 includes a vertical wall 2S facing the vertical wall 1S of the dash panel 1 and an inclined wall 2K descending rearward facing the inclined wall 1K of the dash panel 1, and an upper flange 2F1 of the vertical wall 2S of the cross member 2 Is welded to the front surface of the vertical wall 1S of the dash panel 1, and the lower flange 2F2 of the inclined wall 2K of the cross member 2 is welded to the lower surface of the inclined wall 1K of the dash panel 1. The interval between the inclined wall 2K of the cross member 2 and the inclined wall 1K of the dash panel 1 is wider toward the front upper side of the vehicle.

  A first column hole H1 that is a hole for inserting the steering column is formed in the inclined wall 2K of the cross member 2, and a second column that is a hole for inserting the steering column in the inclined wall 1K of the dash panel 1 is formed. A hole H2 is formed. (In detail, the pinion shaft protruding from the steering gear box 5 of the steering column is inserted into the first column hole H1 and the second column hole H2.) That is, it is formed on the inclined walls 2K, 1K. Therefore, the peripheral edge of the first column hole H1 and the peripheral edge of the second column hole H2 are inclined such that the vehicle front side Fr is on the upper side. Further, when viewed from the vertical direction of the inclined wall 2K, the second column hole H2 is displaced to the vehicle front side Fr with respect to the first column hole H1. With respect to this positional deviation, the peripheral edge of each column hole H1, H2 that is closest to the vehicle rear side Rr in the front-rear direction of the vehicle is set at substantially the same position, and the second column hole H2 is viewed from the vertical direction of the inclined wall 2K. The position of the vehicle rear side Rr is shifted to such an extent that it can be seen in the first column hole H1. This makes it possible to reduce the second column hole H2 within a range where there is no hindrance to assembly (interference with the pinion shaft).

  The seal structure is attached to the dash panel 1 and the first seal member 10 that fits into the steering gear box 5 and seals between the steering gear box 5 and the periphery of the first column hole H1 of the cross member 2. And a second seal member 14 that seals between the first seal member 10 and the peripheral portion of the second column hole H2. Both the first seal member 10 and the second seal member 14 are made of a rubber-like elastic body, and the first seal member 10 is located below the inclined wall 2K of the cross member 2. The second seal member 14 is formed in an annular shape having a thicker cross section toward the vehicle front side, and an annular groove 14M formed in the outer peripheral portion is fitted (tightly fitted) to the peripheral portion of the second column hole H2. That is, the second seal member 14 is attached to the peripheral portion of the second column hole H2 by grasping the peripheral portion of the second column hole H2 in which the annular groove 14M is inserted into the annular groove 14M. Therefore, the lower surface of the second seal member 14 (the surface on which the second lip 13 described later abuts) corresponds to the change in the interval due to the difference in the inclination angle between the inclined wall 1K and the inclined wall 2K. ) And the surface of the inclined wall 2K are substantially parallel.

  The first seal member 10 includes a fitting cylinder portion 11 having a circular cross section that is fitted (externally fitted) to a step portion (an end portion from which the pinion shaft protrudes) of the steering gear box 5, and an end portion 12A (lower end) in the axial direction. And the other end 12B (upper end) in the axial direction of the first lip 12 is the first column hole H1. Is pressed against the periphery of the engine room from the engine room side to seal between the steering gear box 5 and the periphery of the first column hole H1. A plurality of ridges 12T (see FIG. 4) are formed on the end face of the other end portion 12B in the axial direction of the first lip 12 to improve the sealing performance.

  Further, the first seal member 10 includes an annular (cup-shaped) second lip 13 that is located on the radially inner side of the first lip 12 and that extends upward. The second lip 13 has an axial end one end portion 13A (lower end portion) connected to the upper end portion of the fitting cylinder portion 11, penetrates the first column hole H1, and the axial end other end portion 13B (upper end portion). ) Is in pressure contact with the lower surface of the second seal member 14 (the surface facing the front lower side) to seal between the steering gear box 5 and the second seal member 14. On the end face of the other end portion 13B in the axial direction of the second lip 13, a plurality of ridges 13T (see FIG. 4) are formed over the entire circumference to improve the sealing performance.

  The fitting cylinder portion 11 is set in an oblique posture that becomes rearward as the axis O1 (which coincides with the axis of the steering gear box 5 and is common with the axis of the first seal member 10) moves upward. Yes. As shown in FIGS. 2 and 4, the front half 12Z1 of the first lip 12 located on the vehicle front side Fr with respect to the axis O1 of the fitting cylinder 11 is a transverse cross section (cross section parallel to the inclined wall 2K). The rear half part 12Z2 of the first lip 12 located on the vehicle rear side Rr with respect to the axis O1 is formed in a V-shaped cross section with a circular arc and smoothly connected to the front half part 12Z1. ing. The same applies to the end surface of the other end portion 12B (upper end portion) in the axial direction of the first lip 12. The front half portion 12Z1 is formed in a semicircular shape, and the rear half portion 12Z2 is formed in a V shape with corners being circular arcs. And is smoothly connected to the front half 12Z1. The shape of the first column hole H1 is also formed to match the end surface (seal surface) of the other end portion 12B (upper end portion) of the first lip 12 in the axial center direction, the front half portion being semicircular, The corner portion has a V-shape with an arc, and the front half and the rear half are smoothly connected.

  Further, a corner portion (V-shaped arc-shaped corner portion) of the rear half portion 12Z2 of the first lip 12 is located on the most rear side Rr in the rear half portion 12Z2, and the axis of the fitting cylinder portion 11 is located. The length from O1 to the outer peripheral surface of the corner is set to be longer than the length from the axis O1 to the outer peripheral surface of the front half 12Z1. The shape of the first column hole H1 is the same, and the second half portion is formed in a V shape and the hole is extended to the rear side, so that the size of the first column hole H1 is kept small, and the tip of the pinion shaft Interference can be avoided, and assemblability is improved. In particular, it is effective in an assembling method that is assembled by approaching from below. The latter half portion 12Z2 is connected to the fitting cylinder portion 11 through an end wall 12D. Since the axis O1 of the fitting cylinder 11 and the inclined wall 2K have a relative angle that is not perpendicular, the length of the first lip 12 from the fitting cylinder 11 (the length in the vertical direction, the axis of the first lip 12). The length in the direction) becomes shorter as it becomes the vehicle rear side Rr.

In the above-described automobile assembly process, after the first seal member 10 is assembled to the steering gear box 5 of the steering apparatus, the steering apparatus is dashed in a state where the steering gear box 5 is inclined with the upper end slightly rearward. The panel 1 and the cross member 2 are assembled by ascending and approaching from below (see FIG. 5).
In this case, the surface of the peripheral portion of the first column hole H1 is inclined with respect to the approaching direction (vertical direction) of the steering device to the dash panel 1 or the like (inclined so that the vehicle front side is on the upper side). If the positions in the vehicle front-rear direction are sometimes shifted, the other end 12B of the first lip 12 may enter the first column hole H1 or get caught by the peripheral edge of the first column hole H1.

  2 and 4, as the first seal member 10 is assembled to the dash panel 1 and the cross member 2 side from below, the first lip 12 at the position of the first column hole H1 is located. A guide portion 15 for guiding the other end portion 12B to the peripheral edge side of the first column hole H1 is provided on the upper portion (the front half portion 12Z1) of the first lip 12 on the vehicle front side Fr.

  The guide portion 15 protrudes radially outward of the first lip 12 along the panel surface of the cross member 2 from the upper portion of the front half portion 12Z1 of the first lip 12 (upper portion of the vehicle front side Fr). . The guide portion 15 is formed in a semicircular arc shape along the outer peripheral surface of the front half portion 12Z1, and there is a step between the guide surface 15M and the pressure contact surface of the upper end portion of the first lip 12 with respect to the cross member 2. The guide surface 15M is located below the pressure contact surface (on the fitting tube portion 11 side), and does not contact the cross member 2 when mounted on the vehicle. The longitudinal section of the guide portion 15 is formed in an arcuate projecting curved surface as shown in FIG. 2 so as to slide smoothly along the peripheral edge of the first column hole H1.

  As the first seal member 10 fitted to the steering gear box 5 is assembled to the dash panel 1 and the cross member 2 side from below, the guide portion 15 moves the peripheral portion of the first column hole H1 to the first column hole H1. The other end portion 12B of the first lip 12 is guided to the peripheral edge side of the first column hole H1 while sliding radially outward.

As described above, the guide portion 15 is provided on the first seal member 10, and the guide portion 15 is provided on the vehicle front side Fr of the first lip 12 that is easily caught by the peripheral edge portion of the first column hole H1. Therefore, it is possible to avoid the other end 12B of the first lip 12 from entering the first column hole H1 and the other end 12B of the first lip 12 from being caught on the peripheral edge of the first column hole H1. Can be improved.
Further, since the guide portion 15 is formed in an arc shape along the circumferential direction of the first lip 12, and the guide surface 15M of the guide portion 15 is formed in an arc-shaped projecting curved surface in the longitudinal section, the guide portion 15 is a cross member. 2 can be smoothly slid when abutted against the second lip 12, and the other end 12B of the first lip 12 can be smoothly guided toward the peripheral edge of the first column hole H1.

  As a method for avoiding the entry of the first lip 12 into the first column hole H1 and the catching of the first column hole H1 on the peripheral edge thereof, there is a method of making the first lip 12 larger than the diameter of the first column hole H1. However, in this method, the first seal member 10 becomes large and it is necessary to provide a wide seal surface at the peripheral edge of the first column hole H1. In addition, the seal length is increased, the seal surface pressure is lowered, and the seal performance is deteriorated.

  On the other hand, according to the above configuration of the present invention, the first seal member 10 can be reduced in size, and it is not necessary to provide a wide seal surface at the peripheral portion of the first column hole H1, and the seal length is increased. Therefore, it is possible to avoid the deterioration of the sealing performance due to the bottom of the seal surface pressure.

  As shown in FIGS. 2, 3, and 4, the first seal member 10 includes an inner first rib L <b> 1 that connects the inner peripheral surface of the first lip 12 and the outer peripheral surface of the second lip 13, and the first lip. 12, and an outer second rib L <b> 2 that connects the outer peripheral surface of 12 and the lower surface of the guide portion 15. The first rib L1 and the second rib L2 are located at the same position in the circumferential direction of the first seal member 10. A plurality of ribs L including the first ribs L1 and the second ribs L2 are provided radially with respect to the axis O1 of the first seal member 10 (the axis O1 of the fitting cylinder portion 11). The rib L can reinforce the second lip 13. And the stability and press-contact force of the press-contact position with respect to the peripheral part of the 2nd column hole H2 of the 2nd rib L2 are ensured, and sealing performance improves.

According to the above configuration, the column hole sealing structure is fitted to the steering gear box 5 and seals between the steering gear box 5 and the peripheral portion of the first column hole H1 of the cross member 2. And the second seal member 14 that is attached to the dash panel 1 and seals between the first seal member 10 and the peripheral portion of the second column hole H2, the sealing performance is improved, and dust in the vehicle interior is improved. And sound can be reliably prevented.
Further, since the first seal member 10 and the second seal member 14 are brought into contact with each other to seal the space in the cross member 2 and the vehicle interior, the sealing performance can be improved without impairing the assembling property of the steering gear box 5. .

Further, by attaching the second seal member 14 to the peripheral portion of the second column hole H2, the second seal member 14 becomes a protective member, and damage due to the contact between the steering gear box 5 and the dash panel 1 can be avoided.
As a result, the diameter of the second column hole H2 of the dash panel 1 can be reduced, and the opening of the vehicle interior side portion can be made smaller than the second column hole H2 by the arrangement of the second seal member 14. Accordingly, the diameter of the second lip 13 can be reduced, the second lip 13 can be easily inserted into the first column hole H1, and the assembling property can be improved. Further, since the second column hole H2 is displaced to the vehicle front side Fr with respect to the first column hole H1, the second lip 13 can be easily inserted into the first column hole H1, and further assembled. Can be improved.

For example, in a structure in which the first column hole H1 and the second column hole H2 are concentrically positioned, when the steering gear box 5 assembled with the first seal member 10 is assembled to the dash panel 1 or the like, the steering gear box 5 When the steering gear box is assembled in a state in which the shaft center on the upper end side of the vehicle is inclined toward the vehicle front side Fr with respect to the regular position, the vehicle of the pinion shaft protruding from the steering gear box 5 and the second column hole H2 The space | interval with the inner peripheral part of the front side Fr becomes short.
On the other hand, according to the above configuration of the present invention, the second column hole H2 is displaced to the vehicle front side Fr with respect to the first column hole H1, and therefore the tip of the pinion shaft protruding from the steering gear box 5 Can be made longer and the pinion shaft can be made difficult to interfere with the inner peripheral edge of the second column hole H2 to improve the assembling property. Can be made.

DESCRIPTION OF SYMBOLS 1 Dash panel 2 Cross member 5 Steering gear box 10 1st seal member 11 Fitting cylinder part 12 1st lip 12A One end part of an axial center direction (one end part of the axial direction of a 1st lip)
12B The other end in the axial direction (the other end in the axial direction of the first lip)
13 Second lip 13A One end portion in the axial direction (one end portion in the axial direction of the second lip)
13B The other end in the axial direction (the other end in the axial direction of the second lip)
14 Second seal member 15 Guide portion 15M Guide surface Fr Vehicle front side H1 First column hole H2 Second column hole L1 First rib L2 Second rib L Rib O1 Shaft core (shaft core of the first seal member)

Claims (7)

A column hole seal structure of a dash panel through which a steering column is disposed,
A cross member is joined to the dash panel to form a closed cross section with the dash panel and the cross member,
A first column hole is formed in the cross member and a second column hole is formed in the dash panel;
A first seal member that fits into a steering gear box and seals between the steering gear box and a peripheral portion of the first column hole of the cross member;
A column hole sealing structure comprising a second seal member attached to the dash panel and sealing between the first seal member and a peripheral portion of the second column hole. The peripheral edge of the first column hole is inclined so that the vehicle front side is the upper side,
The first seal member includes a fitting tube portion that fits into the steering gear box, and an annular first lip that has one end in the axial direction continuous to the fitting tube portion. The other end in the axial direction is in pressure contact with the peripheral edge of the first column hole,
As the first seal member fitted to the steering gear box is assembled to the dash panel and cross member side from below, the other end portion of the first lip is guided to the peripheral side of the first column hole. A guide portion is provided on the vehicle front side upper portion of the first lip,
2. The column hole sealing structure according to claim 1, wherein the guide portion protrudes radially outward of the first lip along a panel surface of the cross member from an upper portion of the first lip on the vehicle front side. The peripheral edge of the second column hole is inclined so that the vehicle front side is the upper side,
The column hole sealing structure according to claim 2, wherein the second column hole is displaced toward the vehicle front side with respect to the first column hole. The guide portion is formed in an arc shape along the circumferential direction of the first lip,
The guide surface of the guide portion is formed in an arc-shaped projecting curved surface in a longitudinal section,
As the first seal member fitted to the steering gear box is assembled to the dash panel and the cross member side from below, the guide portion moves the peripheral edge portion of the first column hole to the diameter of the first column hole. The column hole sealing structure according to claim 2 or 3, wherein the other end portion of the first lip is guided toward the peripheral edge side of the first column hole while sliding outward in the direction. The second seal member is annularly formed and attached to the second column hole;
The first seal member includes an annular second lip located radially inward of the first lip;
2. The second lip has one end in the axial direction continuous to the fitting cylinder, and the other end in the axial direction is in pressure contact with the second seal member through the first column hole. 5. The column hole seal structure according to any one of 4 above.   6. The column hole sealing structure according to claim 5, wherein the first seal member includes a first rib connecting the inner peripheral surface of the first lip and the outer peripheral surface of the second lip. The first seal member includes a second rib that connects the outer peripheral surface of the first lip and the lower surface of the guide portion,
The first rib and the second rib are located at the same position in the circumferential direction of the first seal member;
The column hole seal structure according to claim 6, wherein a plurality of ribs each including the first rib and the second rib are provided radially with respect to an axis of the first seal member.

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