JP2019018730A - Column hole cover - Google Patents

Abstract

To provide a column hole cover which has an improved function for prevention of entry of a noise into a cabin.SOLUTION: A column hole cover 6 which is located between a housing 4, which accommodates a pinion shaft 32 which is rotated according to steering operations of a rack shaft 31 and a steering wheel 10, and a dash panel 7 which partitions the interior and the exterior of a cabin, and which seals an insertion port 70 provided in the dash panel 7. This column hole cover comprises a body 61 comprising an elastic body, and a metal plate 60 provided with an open hole 600 for penetration of the pinion shaft 32 therethrough. The body 61 integrally has: a cylindrical part 62 of which one end part elastically contacts the dash panel 7 and the other end part is fitted in the housing 4; an annular seal portion 63 which elastically contacts an outer peripheral surface of the pinion shaft 32; and a connection part 64 which connects the cylindrical part 62 and the seal portion 63 to each other. A dash panel 7 side front face 60a and a housing 4 side rear face 60b of the metal plate 60 are covered by the connection part 64 and are embedded in the connection part 64.SELECTED DRAWING: Figure 3A

Description

  The present invention relates to a column hole cover that is disposed between a housing that houses a rotating shaft that rotates in response to a steering operation of a steering wheel and a dash panel that partitions the interior and exterior of a vehicle interior.

  Conventionally, an engine room and a vehicle compartment of a vehicle are partitioned by a dash panel made of a steel plate constituting a vehicle body. The dash panel is provided with a plurality of insertion holes, through which air conditioner piping, various electrical equipment harnesses, and various rods are inserted. These insertion openings are sealed by a cover member made of an elastic body such as rubber disposed on the outside of the passenger compartment, so that intrusion of noise and dust from the engine compartment into the passenger compartment is suppressed. An insertion port of a dash panel through which a pinion shaft connected to a steering shaft that rotates according to a steering operation of the steering wheel is inserted is sealed by a cylindrical cover member called a column hole cover (for example, Patent Document 1). , 2).

  The column hole cover described in Patent Literatures 1 and 2 includes a seal portion that elastically contacts the dash panel at one end portion, and the other end portion is fitted to an opening end portion of a housing that houses the pinion shaft. In the pinion shaft, pinion teeth provided at the tip thereof are meshed with the rack teeth of the rack shaft that steers the steered wheels (front wheels) by advancing and retreating in the vehicle width direction in the housing.

JP 2004-322788 A JP 2011-1030 A

  According to the column hole cover as described above, it is possible to suppress the noise of the engine, the transmission, etc. generated outside the housing that houses the rack shaft from entering the vehicle interior from the insertion port of the dash panel. As for the noise generated inside the housing due to the engagement between the pinion teeth and the rack teeth, the intrusion into the vehicle interior cannot be sufficiently suppressed.

  In particular, in recent vehicles, a worm gear mechanism including a worm and a worm wheel is disposed in a housing, and the worm is rotated by an electric motor. In many cases, a vehicle equipped with such a steering assist device has increased noise generated in the housing, and some measures have been required.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a column hole cover having an enhanced function of preventing noise from entering a vehicle compartment.

  In order to achieve the above object, the present invention accommodates a turning shaft for turning a steered wheel by movement in an axial direction and a rotating shaft that meshes with the turning shaft and rotates according to a steering operation of a steering wheel. A column hole cover that is disposed between the housing and a dash panel that partitions the interior and exterior of the vehicle and seals the insertion opening of the rotating shaft provided in the dash panel, the main body formed of an elastic body, A metal plate formed with a through-hole through which the rotation shaft passes, and the main body has a cylindrical portion with one end elastically contacting the dash panel and the other end fitted into the housing; An annular seal portion that is arranged on the radially inner side and elastically contacts the outer peripheral surface of the rotating shaft, and a connection portion that connects the cylindrical portion and the seal portion are integrally formed, and the metal plate includes the dash panel If the side surface The surface of the housing side is covered with the connecting portions are embedded inside the connecting part, providing a column hole cover.

  According to the column hole cover of the present invention, it is possible to enhance the function of preventing noise from entering the vehicle compartment.

It is a block diagram which shows typically the structural example of the steering device with which the column hole cover which concerns on embodiment of this invention was mounted | worn. It is sectional drawing which shows the inside of a housing. It is sectional drawing which shows the state which looked at the joint cover, the column hole cover, and its peripheral part from the vehicle width direction. It is an external view which shows the state which looked at the joint cover, the column hole cover, and its peripheral part from the direction orthogonal to the vehicle width direction and the longitudinal direction of a pinion shaft. It is a perspective view which shows a column hole cover. It is a perspective view which shows the metal plate of a column hole cover. It is a top view which shows the column hole cover which concerns on a comparative example. It is sectional drawing which shows a column hole cover in the cross section along the longitudinal direction of a pinion shaft.

[Embodiment]
Embodiments of the present invention will be described with reference to the drawings. In addition, although embodiment described below is shown as a suitable specific example in implementing this invention, although there are some parts which have illustrated various technical matters that are technically preferable. The technical scope of the present invention is not limited to this specific embodiment.

  FIG. 1 is a configuration diagram schematically illustrating a configuration example of a steering device including a column hole cover according to an embodiment of the present invention.

  This steering device 1 is of a rack and pinion type, and a steering wheel 10 that is rotated by a driver, a steering shaft 2, and a steering wheel that steers a pair of left and right front wheels 13 and 13 by movement in an axial direction. A rack shaft 31 as a shaft, a pinion shaft 32 connected to the steering shaft 2 and meshing with the rack shaft 31, a housing 4 housing each of the rack shaft 31 and the pinion shaft 32, and a steering operation by the driver An assisting steering assisting device 5 and a column hole cover 6 are provided. The rack shaft 31, the pinion shaft 32, and the housing 4 constitute the steering gear 3.

  The steering shaft 2 includes a column shaft 21 to which the steering wheel 10 is fixed at one end, and an intermediate shaft 22 connected to the column shaft 21 via a first universal joint 201. A pinion shaft 32 is connected to the intermediate shaft 22 via a second universal joint 202. The steering shaft 2 rotates in response to a rotation operation of the steering wheel 10 and transmits a steering torque applied to the steering wheel 10 to the pinion shaft 32.

  The pinion shaft 32 is a member corresponding to the rotating shaft of the present invention that rotates in accordance with the steering operation of the steering wheel 10, and has a plurality of pinion teeth 321 formed at the tip opposite to the intermediate shaft 22. Part 320. The rack shaft 31 has a rack tooth portion 310 composed of a plurality of rack teeth 311 meshing with the pinion teeth 321, and moves in the axial direction along the vehicle width direction by the rotation of the pinion shaft 32. The pinion tooth portion 320 of the pinion shaft 32 and the rack tooth portion 310 of the rack shaft 31 are engaged with each other inside the housing 4.

  Ball joint sockets 11, 11 are fixed to both ends of the rack shaft 31, and tie rods 12, 12 connected to the ball joint sockets 11, 11 are connected to a pair of left and right front wheels via a knuckle arm (not shown). 13 and 13. Bellows 14 and 14 made of a bellows-like elastic body are disposed on the outer peripheral side of the ball joint sockets 11 and 11. With this configuration, the rack shaft 31 steers the left and right front wheels 13, 13 that are steered wheels of the vehicle by axial movement caused by the rotation of the pinion shaft 32.

  The housing 4 includes a first cylinder part 41 that accommodates a part of the rack shaft 31 including the rack tooth part 310, a second cylinder part 42 that accommodates a part of the pinion shaft 32 including the pinion tooth part 320, and a second It has a joint cover 43 as a cover member made of resin fitted to the cylindrical portion 42. The first cylinder portion 41 is fixed to the vehicle body such that the longitudinal direction is the vehicle width direction, and bellows 14 and 14 are fixed to both ends thereof. The second cylinder part 42 protrudes obliquely upward with respect to the first cylinder part 41. The joint cover 43 is attached to the end of the second cylinder portion 42 on the opening side, and the pinion shaft 32 is inserted through the inside thereof.

  The steering assist device 5 includes a controller 50, a torque sensor 51 that detects a steering torque applied by the driver to the steering wheel 10, an electric motor 52 that receives supply of motor current from the controller 50, and an output shaft 521 of the electric motor 52. And a speed reduction mechanism 53 that transmits the rotational force of the motor to the pinion shaft 32. The torque sensor 51 and the speed reduction mechanism 53 are accommodated in the second cylindrical portion 42 of the housing 4. In the present embodiment, the speed reduction mechanism 53 is a worm gear mechanism, and a worm 531 that rotates integrally with the output shaft 521 of the electric motor 52 and a worm wheel 532 that rotates integrally with the pinion shaft 32 are engaged with each other. The controller 50 controls the electric motor 52 based on the steering torque, the vehicle speed, etc. detected by the torque sensor 51, and the rotational force of the output shaft 521 of the electric motor 52 decelerated by the speed reduction mechanism 53 serves as a pinion shaft. 32.

  The pinion shaft 32 is inserted through an insertion port 70 provided in the dash panel 7 constituting a part of the vehicle body. The dash panel 7 is made of a steel plate that constitutes the vehicle body, and partitions the interior and exterior of the vehicle interior. In FIG. 1, the part below the dash panel 7 is disposed in the engine room outside the vehicle compartment, and the part above the dash panel 7 is disposed in the vehicle interior.

  Between the housing 4 and the dash panel 7, a column hole cover 6 that seals the insertion opening 70 is disposed. The column hole cover 6 prevents noise generated by the engine, transmission, etc. in the engine room from entering the vehicle compartment. Further, the column hole cover 6 also prevents the noise generated by the meshing portion of the pinion tooth portion 320 and the rack tooth portion 310, the speed reduction mechanism 53 or the electric motor 52 from entering the vehicle interior. Details of the structure of the column hole cover 6 will be described later.

  FIG. 2 is a cross-sectional view showing the inside of the housing 4 in a cross section including the rotation axis of the pinion shaft 32. In FIG. 2, the lower side of the drawing corresponds to the lower side in the vertical direction when mounted on the vehicle, and the upper side of the drawing corresponds to the upper side of the vertical direction when mounted on the vehicle.

  The pinion shaft 32 includes an input shaft 33 having one end connected to the second universal joint 202, an output shaft 34 having a pinion tooth portion 320, and a torsion bar (torsion shaft) connecting the input shaft 33 and the output shaft 34. 35). A worm wheel 532 is fixed to the output shaft 34 so as not to be relatively rotatable. The torque sensor 51 detects the steering torque based on the twist amount of the torsion bar 35.

  The second cylindrical portion 42 of the housing 4 includes a gear housing 421 formed integrally with the first cylindrical portion 41 and a cylindrical sensor housing 422 that accommodates the torque sensor 51. The gear housing 421 and the sensor housing 422 are made of a metal such as an aluminum alloy, for example. Note that the sensor housing 422 may be formed of resin. The sensor housing 422 has a cylindrical shape through which the pinion shaft 32 is inserted, and the cylindrical portion of the present invention corresponds to this.

  The gear housing 421 and the sensor housing 422 are coupled by inlay fitting and fastened by a bolt (not shown). The gear housing 421 houses a rack guide mechanism 44 that elastically presses the rack tooth portion 310 of the rack shaft 31 against the pinion tooth portion 320.

  A tip portion 422a of the sensor housing 422 to which the joint cover 43 is attached is formed in a stepped cylindrical shape. That is, a small-diameter cylindrical portion 423 is formed at the distal end portion 422a of the sensor housing 422, and between the outer peripheral surface 423a of the small-diameter cylindrical portion 423 and the outer peripheral surface 422b of the sensor housing 422 below the small-diameter cylindrical portion 423. A step surface 423b is formed on the surface.

  3A shows a state in which the joint cover 43 and the column hole cover 6 and the periphery thereof are viewed from the vehicle width direction, and FIG. 3B shows a state in which they are viewed from the direction orthogonal to the vehicle width direction and the longitudinal direction of the pinion shaft 32. Is shown. In FIG. 3A, the joint cover 43 and the column hole cover 6 are shown in a cross section along the longitudinal direction of the pinion shaft 32. 4A is a perspective view showing the column hole cover 6, and FIG. 4B is a perspective view showing the metal plate 60 of the column hole cover 6.

  The joint cover 43 is made of, for example, a resin such as polypropylene, and is formed by injection molding. The joint cover 43 includes a cylindrical portion 431 through which the pinion shaft 32 is inserted, an annular plate-shaped flange portion 432 formed to project outward from the cylindrical portion 431 along the radial direction of the pinion shaft 32, and a cylindrical portion 431. And a bead portion 433 having a triangular plate shape formed between the flange portion 432.

  The lower end portion of the cylindrical portion 431 is fitted into the distal end portion 422a of the sensor housing 422 by press fitting. The cylindrical portion 431 is provided with an annular receiving portion 431a that receives a pressing force during the press-fitting. The lower end surface 431b of the cylindrical portion 431 is in contact with the step surface 423b of the sensor housing 422, and the inner peripheral surface 431c of the cylindrical portion 431 is in close contact with the outer peripheral surface 423a of the small diameter cylindrical portion 423. A part of the cylindrical portion 431 is formed in a tapered shape, and the inner diameter at the upper end is smaller than the inner diameter at the lower end. The inner diameter at the upper end of the cylindrical portion 431 is formed larger than the diameter of the pinion shaft 32.

  The column hole cover 6 includes a metal plate 60 in which a through hole 600 through which the pinion shaft 32 passes is formed, and a main body 61 made of an elastic body. The main body 61 is made of a softer material than the joint cover 43, and in the present embodiment, the main body 61 is made of a rubber material such as EPDM (ethylene-propylene-diene rubber). The main body 61 has one end elastically contacting the dash panel 7 and the other end fitted to the joint cover 43, and the outer peripheral surface of the pinion shaft 32 provided inside the through hole 600 of the metal plate 60. An annular seal portion 63 that is elastically contacted with each other and a connection portion 64 that connects the cylindrical portion 62 and the seal portion 63 are integrally provided.

  The cylindrical portion 62 has a bellows structure composed of a large diameter portion 621 and a small diameter portion 622, and is disposed between the housing 4 and the dash panel 7 in a state compressed in the axial direction of the pinion shaft 32. In the present embodiment, the cylindrical portion 62 has one large diameter portion 621 and two small diameter portions 622, and the large diameter portion 621 is provided between the two small diameter portions 622. And the number of the small diameter parts 622 can be increased / decreased suitably.

  The cylindrical portion 62 has an oval shape in which the shape viewed from the axial direction of the pinion shaft 32 is long in the protruding direction of the bead portion 433 from the cylindrical portion 431 of the joint cover 43. One end portion of the cylindrical portion 62 is provided with a sealing portion 623 that is in close contact with the surface 7a on the engine room side of the dash panel 7 surrounding the insertion port 70 and seals the insertion port 70. As shown in FIG. 4A, a plurality of annular lips 623a and a plurality of ribs 623b intersecting with the plurality of annular lips 623a are formed. In the present embodiment, two annular lips 623a are formed in the sealing portion 623 in parallel with each other, and 16 ribs 623b are formed so as to be orthogonal to the annular lip 623a. The two annular lips 623a protrude between the three annular grooves 623c. The sealing portion 623 is pressed against the dash panel 7 by the restoring force of the bellows structure of the cylindrical portion 62.

  A fitting groove 624 into which the flange portion 432 of the joint cover 43 is fitted is formed at the other end portion of the cylindrical portion 62. When the column hole cover 6 is attached to the joint cover 43, the other end portion of the cylindrical portion 62 is elastically deformed to accommodate the flange portion 432 in the fitting groove 624, so that the cylindrical portion 62 is fitted to the joint cover 43. Combined.

  The seal portion 63 has a pinion shaft 32 inserted through the center thereof, and surrounds the pair of annular lip portions 631 and 632 that are in sliding contact with the outer peripheral surface 32a of the pinion shaft 32, and these annular lip portions 631 and 632. And an annular buffer portion 633 formed. The annular lip portions 631 and 632 are in sliding contact with the outer peripheral surface 32a of the pinion shaft 32 at positions separated in the axial direction of the pinion shaft 32.

  Even when the position of the pinion shaft 32 with respect to the cylindrical portion 62 is displaced in the radial direction, the buffer portion 633 causes the position of the pair of annular lip portions 631 and 632 to follow the position of the pinion shaft 32 due to its elastic deformation. The lip parts 631 and 632 are brought into sliding contact with the outer peripheral surface 32a of the pinion shaft 32 over the entire circumference. The seal portion 63 is formed at a position corresponding to the inside of the through hole 600 of the metal plate 60 when the column hole cover 6 is viewed from the axial direction of the pinion shaft 32.

  The connection portion 64 covers the front (front) surface 60 a on the dash panel 7 side of the metal plate 60 and the back surface 60 b on the housing 4 side. More specifically, the connecting portion 64 includes a first covering portion 641 that covers the front surface 60 a of the metal plate 60, a second covering portion 642 that covers the back surface 60 b of the metal plate 60, and the inner peripheral surface 600 a of the through hole 600. A connecting portion 643 that covers and connects the first covering portion 641 and the second covering portion 642 is provided. The outer peripheral surface 60 c of the metal plate 60 is covered with the cylindrical portion 62 in the vicinity of the sealing portion 623. Thus, the entire metal plate 60 is covered with the main body 61 and embedded in the connection portion 64, and is not exposed to the outside of the main body 61.

  The first covering portion 641 is disposed closer to the joint cover 43 than the sealing portion 623, and a space is formed between the dash panel 7 and the first covering portion 641. The shape of the metal plate 60 viewed from the axial direction of the pinion shaft 32 is an oval shape similar to that of the cylindrical portion 62. At least a part of the first covering portion 641 faces the insertion opening 70 of the dash panel 7. In other words, when the column hole cover 6 is viewed from the vehicle interior side along the axial direction of the pinion shaft 32, a part of the first covering portion 641 can be visually recognized from the insertion port 70. Thereby, a part of the insertion opening 70 is shielded by the metal plate 60.

(Method for manufacturing column hole cover 6)
The main body 61 of the column hole cover 6 is molded by, for example, a primary molding process and a secondary molding process. Specifically, the portion of the cylindrical portion 62 and the connecting portion 64 that is closer to the dash panel 7 than the metal plate 60 and the seal portion 63 are primarily formed, and a metal is formed on the portion that becomes the first covering portion 641 of the obtained intermediate formed body. The plate 60 is placed, and the part closer to the housing 4 than the metal plate 60 is secondarily formed. Each of these steps can be automatically performed in a molding machine.

[Comparative example]
FIG. 5A is a top view showing the column hole cover 8 according to the comparative example, and FIG. 5B is a cross-sectional view showing the column hole cover 8 in a cross section along the longitudinal direction of the pinion shaft 32.

  The column hole cover 8 according to this comparative example includes a metal plate 80 having a through hole 800 through which the pinion shaft 32 passes, a first elastic member 83 integrally including a cylindrical portion 81 and a wall portion 82, and a seal portion 84. And the second elastic member 87 having the buffer portion 85 and the attachment portion 86 integrally. The metal plate 80 is the same member as the metal plate 60 of the column hole cover 6 according to the embodiment. The first elastic member 83 and the second elastic member 87 are made of a rubber material such as EPDM.

  The cylinder part 81 has a bellows structure composed of a large diameter part 811 and a small diameter part 812, like the cylinder part 62 of the column hole cover 6 according to the embodiment, and a sealing part 813 is provided at one end thereof. A plurality of annular lips 813 a and a plurality of ribs 813 b are formed in the sealing portion 813. A fitting groove 814 into which the flange portion 432 of the joint cover 43 is fitted is formed at the other end portion of the cylindrical portion 81. An annular groove 815 into which the outer peripheral end of the metal plate 80 is fitted is formed on the inner peripheral surface of the cylindrical portion 81. The first elastic member 83 is assembled to the metal plate 80 by fitting the outer peripheral end portion of the metal plate 80 into the annular groove 815. The wall portion 82 has a flat plate shape having an insertion port 820 through which the pinion shaft 32 is inserted, and a lower surface 82 a thereof is in contact with the upper end portion of the joint cover 43 inside the cylindrical portion 81.

  The seal portion 84 has a pair of annular lip portions 841 and 842 that are in sliding contact with the outer peripheral surface 32 a of the pinion shaft 32. The buffer portion 85 is formed so as to surround these annular lip portions 841 and 842, and functions in the same manner as the buffer portion 633 of the column hole cover 6 according to the embodiment. The mounting portion 86 is provided in an annular shape around the outer periphery of the buffer portion 85, and an annular groove 860 in which the peripheral portion of the through hole 800 in the metal plate 80 is fitted is formed on the inner peripheral surface thereof. The second elastic member 87 is assembled to the metal plate 80 by fitting the peripheral portion of the through hole 800 in the metal plate 80 into the annular groove 860.

  In the column hole cover 8 according to this comparative example, it is necessary to manually assemble the first elastic member 83 and the second elastic member 87 to the metal plate 80, which increases the number of assembling steps. Although the metal plate 80 has an effect of suppressing the noise generated in the housing 4 from entering the passenger compartment, the surface 80a and the back surface 80b of the metal plate 80 are not covered. It is smaller than the column hole cover 6 according to the embodiment.

(Operation and effect of the embodiment)
According to the embodiment described above, the cylindrical portion 62 and the seal portion 63 of the column hole cover 6 are integrally connected by the connection portion 64, and the front surface 60 a and the back surface 60 b of the metal plate 60 are connected to the connection portion 64. Since it is covered, the function of preventing noise generated in the housing 4 from entering the vehicle compartment is enhanced as compared with the column hole cover 8 according to the comparative example or the column hole cover not having the metal plate. In addition, this makes it possible to improve the quietness of the passenger compartment.

  Further, the column hole cover 6 is formed so that the metal plate 60 is embedded in the main body 61, so that the whole is integrally formed. For example, like the column hole cover 8 according to the comparative example, it is necessary to perform manual assembly. There is no. For this reason, it is possible to reduce the cost by reducing the number of assembling steps.

  In the column hole cover 6, the cylindrical portion 62 has a bellows structure. Therefore, even if the distance between the flange portion 432 of the joint cover 43 and the dash panel 7 varies due to a dimensional error or an assembly error of each portion, the bellows is provided. The change in the spacing can be flexibly absorbed by the elasticity of the structure, and the sealing portion 623 of the column hole cover 6 can be pressed against the dash panel 7 with an appropriate pressing force.

  In the column hole cover 6, a part of the first covering portion 641 faces the insertion port 70 of the dash panel 7, and a part of the insertion port 70 is shielded by the metal plate 60. The noise generated by the sound is insulated by the metal plate 60 having higher rigidity than that of rubber, and the noise entering the vehicle interior from the insertion opening 70 is reduced.

  Further, since the housing 4 has a joint cover 43 made of resin fitted to the second cylindrical portion 42 and the flange portion 432 of the joint cover 43 is fitted into the fitting groove 624 of the cylindrical portion 62, the flange 4 The portion 432 can be easily molded, and the column hole cover 6 can be firmly attached to the housing 4.

(Appendix)
As mentioned above, although this invention was demonstrated based on embodiment, these embodiment does not limit the invention which concerns on a claim. In addition, it should be noted that not all the combinations of features described in the embodiments are essential to the means for solving the problems of the invention.

  Further, the present invention can be appropriately modified and implemented without departing from the spirit of the present invention. For example, in the above embodiment, the case where the worm 531 and the worm wheel 532 of the steering assist device 5 are arranged in the housing 4 has been described. However, the present invention is not limited to this, and for example, a column in which a steering assist force is applied to the column shaft 21. The column hole cover according to the present invention can also be used for an assist system or a rack assist system steering device in which a steering assist force is applied to the rack shaft 31.

DESCRIPTION OF SYMBOLS 1 ... Steering device 10 ... Steering wheel 31 ... Rack shaft (steering shaft) 32 ... Pinion shaft (rotating shaft)
4 ... Housing 43 ... Joint cover (cover member)
6 ... Column hole cover 60 ... Metal plate 600 ... Through hole 61 ... Main body 62 ... Tube portion 63 ... Seal portion 64 ... Connection portion 7 ... Dash panel 70 ... Insertion port

Claims (4)

A steering shaft that steers the steered wheels by movement in the axial direction, a housing that accommodates the rotating shaft that meshes with the steered shaft and rotates according to the steering operation of the steering wheel, and a dash panel that partitions the interior and exterior of the vehicle interior A column hole cover for sealing an insertion port of the rotating shaft provided in the dash panel,
A main body made of an elastic body, and a metal plate formed with a through-hole through which the rotation shaft passes,
The main body has one end portion elastically contacting the dash panel and the other end being fitted to the housing, and a ring disposed radially inside the cylindrical portion and elastically contacting the outer peripheral surface of the rotating shaft And a connecting portion that connects the cylindrical portion and the sealing portion together,
The metal plate has a surface on the dash panel side and a surface on the housing side covered with the connection portion and embedded in the connection portion.
Column hole cover. The cylindrical portion has a bellows structure composed of a large diameter portion and a small diameter portion, and is disposed between the housing and the dash panel in a compressed state in the axial direction of the rotation shaft.
The column hole cover according to claim 1. At least a part of the covering portion that covers the surface on the dash panel side in the connection portion faces the insertion port of the dash panel,
The column hole cover according to claim 1 or 2. The housing has a cylindrical portion through which the rotating shaft is inserted, and a cover member made of a resin fitted to an opening end portion of the cylindrical portion,
The cylindrical portion of the main body is fitted to the cover member.
The column hole cover according to any one of claims 1 to 3.

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