JP2020050246A - Shaft insertion hole cover structure of vehicle - Google Patents

Abstract

To suppress the intrusion of noise into a cabin from the outside of the cabin.SOLUTION: A steering shaft 5 penetrates a collar penetration hole 33 defined by a collar internal peripheral face 32 of an annular collar 30. A lower cover 20 is an elastic body integrally having a collar support part 21, a flange part 22 and a surrounding part 23. The collar support part 21 face-contacts with a collar external peripheral face 31, and tightly adheres thereto, and the flange part 22 is fixed to a panel 4 while being tightly overlapped thereon at the outside of an entire peripheral edge of a shaft insertion hole 11 of the panel 4. The surrounding part 23 is diameter-contracted in a funnel shape from the flange part 22 toward the collar support part 21, and blocks a clearance between the collar support part 21 and the flange part 22. The collar support part 21 fixedly supports the collar 30. The collar 30 is permitted in relative rotation with a steering shaft 5, and engaged with the steering shaft 5 so as to be prohibited in relative movement in an axial direction in a state that the collar internal peripheral face 32 and the external peripheral face of the steering shaft 5 approximate each other, or contact with each other.SELECTED DRAWING: Figure 2

Description

  The present disclosure relates to a shaft insertion hole cover structure of a vehicle in which a steering shaft is inserted through a shaft insertion hole.

  Patent Document 1 discloses a steering device in a cab-over type vehicle. A steering shaft having a steering wheel at its upper end is rotatably supported by a steering column, extends directly below the floor, and is connected to a steering gear box. The operating force of the steering wheel is transmitted to the steering gear box via the steering shaft, and the front wheels are steered. The lower part of the steering shaft is configured as a telescopic telescopic structure in which a male upper shaft is slidably fitted into a female lower shaft so as not to restrain the cab tilt and the operation of the cab suspension. . The lower portion of the steering shaft is covered with a dust cover that stands up while surrounding the through portion of the steering shaft to the floor, and the lower end of the lower shaft is connected to the steering gear box via a lower joint so as to be freely bent.

JP 2018-69941 A

  In a vehicle in which the cab can be tilted as in Patent Literature 1, the steering shaft is tilted forward around the lower joint as the cab is tilted. It is necessary to form the shaft in such a size as to allow the tilt of the shaft. For this reason, noise (e.g., engine sound or running sound) below the floor easily enters the vehicle interior above the floor from the gap between the steering shaft and the shaft insertion hole.

  Accordingly, an object of the present disclosure is to provide a floor cover structure of a steering shaft capable of suppressing intrusion of noise from below the floor into a vehicle interior.

  In order to achieve the above object, a first aspect of the present invention is a shaft insertion hole cover structure for a vehicle in which a steering shaft is inserted through a shaft insertion hole provided in a panel defining a vehicle compartment, wherein a collar and a lower cover are provided. Is provided.

  The collar has a ring shape having a collar outer peripheral surface and a collar inner peripheral surface. The collar inner peripheral surface defines a circular collar through hole through which the steering shaft is inserted. The lower cover has a collar supporting portion, a flange-shaped flange portion, and a surrounding portion. The collar support is in close contact with the entire periphery of the collar. The flange portion overlaps with the panel outside the entire periphery of the shaft insertion hole and is fixed in a sealed manner. The surrounding portion extends in a funnel shape from the flange portion toward the collar support portion with a reduced diameter, and closes the space between the collar support portion and the flange portion. The collar supporting portion, the flange portion, and the surrounding portion are integrally formed of an elastic material, and the collar supporting portion fixedly supports the collar. In the state where the inner peripheral surface of the collar and the outer peripheral surface of the steering shaft are close to or in contact with each other over the entire circumference, the steering shaft is allowed to rotate relative to the steering shaft and to prohibit relative movement in the axial direction. Engage with.

  In the above configuration, the inner peripheral surface of the collar is close to or in contact with the outer peripheral surface of the steering shaft over the entire periphery, the collar supporting portion of the lower cover is in surface contact with and is in close contact with the entire outer peripheral surface of the collar, and the lower cover is The flange-shaped flange portion overlaps with the panel outside the entire periphery of the shaft insertion hole and is fixed in a hermetically sealed manner, and the surrounding portion of the lower cover closes between the collar support portion and the flange portion. For this reason, for example, the cab of the vehicle can be tilted, and the steering shaft is tilted about the lower joint on the base end side with the tilt of the cab, and the shaft insertion hole of the panel (for example, a floor panel) through which the steering shaft is inserted is used for steering. Even when the steering shaft is formed to be larger than the outer diameter of the steering shaft so as to allow the tilting, noise outside the vehicle compartment (engine noise, running noise, etc.) below the floor is generated by the steering shaft and the shaft insertion hole. The lower cover and the collar can suppress intrusion into the vehicle cabin through the gap.

  The tilting of the steering shaft when the cab is tilted or the like is allowed by the elastic deformation of the surrounding portion of the lower cover.

  Since the relative rotation between the collar and the steering shaft is allowed, the rotation of the steering shaft according to the input of the steering operation is not blocked by the collar, and the steering shaft can be reliably functioned.

  A second aspect of the present invention is the shaft insertion hole cover structure of the first aspect, wherein the steering shaft is configured to be extendable and contractable by a proximal shaft and a distal shaft that are slidably engaged in the axial direction. Is done. The proximal shaft is inserted into the collar through hole of the collar. The collar has a wire insertion part that allows the insertion of a wire that connects the proximal shaft and the distal shaft when the steering shaft is mounted on the vehicle body side to prevent expansion and contraction of the steering shaft. Formed.

  In the above configuration, when assembling the steering shaft to the vehicle body side, a wire is inserted through the wire insertion portion, and the base shaft and the distal shaft are connected by a wire to prevent expansion and contraction of the steering shaft. After the steering shaft is assembled, the wires are removed to make the steering shaft extendable. Therefore, the assembling work of the steering shaft can be easily performed.

  A third aspect of the present invention is the shaft insertion hole cover structure according to the second aspect, wherein the wire insertion portion is a wire insertion hole penetrating in the axial direction of the steering shaft, and the collar has a wire insertion hole. A lid member that closes openably is provided.

  With the above configuration, the wire insertion hole can be closed by the lid member when the vehicle is used after the steering shaft is assembled, so that the effect of suppressing noise from entering the vehicle interior from outside the vehicle compartment can be enhanced.

  A fourth aspect of the present invention is the shaft insertion hole cover structure of the third aspect, wherein the lid member is urged in the closing direction.

  In the above configuration, since the lid member is urged in the closing direction, it is possible to prevent the wire insertion hole from being maintained open after the steering shaft is assembled and the wire is removed, and the outside of the vehicle compartment can be prevented. The effect of suppressing the intrusion of noise from the vehicle into the vehicle interior can be reliably increased.

  According to a fifth aspect of the present invention, there is provided the shaft insertion hole cover structure according to the first to fourth aspects, wherein the surrounding portion of the lower cover is provided with an easily deformable portion which is easily deformed according to the tilting of the steering shaft.

  In the above configuration, since the easily deformable portion is provided in the surrounding portion of the lower cover, the steering shaft can be tilted more smoothly.

  According to the present disclosure, it is possible to suppress intrusion of noise from outside the vehicle compartment into the vehicle compartment.

It is a side view which shows typically the shaft insertion hole cover structure which concerns on 1st Embodiment of this invention. It is sectional drawing which shows the principal part of FIG. FIG. 3 is a perspective view of FIG. 2 as viewed from below. FIG. 3 is a perspective view of a lower cover of FIG. 2. FIG. 3 is a perspective view of the collar of FIG. 2. It is a perspective view of a collar concerning a 2nd embodiment of the present invention. It is sectional drawing which shows the principal part of 2nd Embodiment of this invention. It is a figure showing the lid member concerning a 3rd embodiment of the present invention, (a) is a top view and (b) is a side view. It is a perspective view showing a modification of a lower cover.

  Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. In the drawings, FR indicates the front of the vehicle, and UP indicates the upper portion of the vehicle. In addition, the front-rear direction in the following description means the front-rear direction of the vehicle, and the left-right direction means the left-right direction in a state facing the front of the vehicle.

  The shaft insertion hole cover structure of the present embodiment is applied to, for example, a cab overtrack (vehicle) in which a cab 1 is supported at a front end of a body frame (not shown) so as to be tiltable. The cab 1 can be tilted between a non-tilt position in which the rear end of the cab 1 is supported from below by the body frame and a tilt position in which the rear end of the cab 1 is tilted forward and upward about the lower front end of the cab 1. At normal times other than when the engine is being maintained, it is held at the non-tilt position.

  As shown in FIG. 1, the front and the lower part of the cabin 2 of the cab 1 are defined by a dash panel 3 and a floor panel (panel) 4, and the steering shaft 5 extends from inside the cabin 2 to below the floor panel 4. . The steering shaft 5 has a telescopic telescopic structure including a male lower shaft (proximal shaft) 6 and a female upper shaft (distal shaft) 7, and a cylindrical upper end of the lower shaft 6. The portion is inserted from below into the inside of the cylindrical lower end of the female upper shaft 7 and slidably engages in the axial direction so as to be expandable and contractible. The upper shaft 7 has a steering wheel 8 at the upper end operated by a driver, and an intermediate portion of the upper shaft 7 is rotatably supported by a steering column (not shown) supported by the dash panel 3. An intermediate portion of the lower shaft 6 is inserted through a shaft insertion hole 11 (see FIG. 2) formed in the floor panel 4, and a lower end of the lower shaft 6 is a steering gear box fixedly supported on the vehicle body frame. 9 via a lower joint 10. When the driver operates the steering wheel 8, the steering shaft 5 rotates, and the operating force from the driver is transmitted to the steering gear box 9 via the steering shaft 5, and the front wheels (not shown) are steered. Note that the steering shaft 5 may have a structure other than the telescopic telescopic structure.

  When the cab 1 is tilted, the upper shaft 7 moves forward and upward away from the lower shaft 6 to extend the steering shaft 5, and the lower shaft 6 tilts about the lower joint 10. As shown in FIG. 2, the shaft insertion hole 11 is formed in a long hole shape in the front-rear direction so as not to interfere with the lower shaft 6 that tilts.

  As shown in FIGS. 1 and 2, an upper cover (main cover) 12 and a lower cover (grommet) 20 are provided around the steering shaft 5. The upper cover 12 includes a hard and cylindrical cover body 13 and an upper bellows 14 formed of an elastic material such as rubber. The cover body 13 rises from the upper surface of the floor panel 4 around the shaft insertion hole 11 and surrounds the steering shaft 5 (the upper part of the lower shaft 6 and the lower part of the upper shaft 7). The cover main body 13 is integrally formed with a flange-shaped lower end mounting portion 15 protruding from the outer peripheral surface of the lower end of the cover main body 13, and the lower end mounting portion 15 is fixed to the floor panel 4. The upper bellows 14 is attached to the cover body 13 to close the upper end side of the cover body 13.

  As shown in FIGS. 2 to 5, the lower cover 20 is an elastic body in which a collar supporting portion 21, a flange portion 22, and a surrounding portion 23 are integrally formed by an elastic material. Is attached. In the present embodiment, the flange portion 22 of the lower cover 20 is disposed above the floor panel 4 (inside the vehicle compartment 2), and the collar support portion 21 and the collar 30 are disposed below the floor panel 4 (outside the vehicle compartment 2). 11 are arranged.

  The collar 30 has an annular shape having a collar outer peripheral surface 31 and a collar inner peripheral surface 32 on an outer periphery and an inner periphery. The collar inner peripheral surface 32 defines a circular collar through hole 33 through which the lower shaft 6 is inserted. . A collar outer peripheral groove 34 recessed toward the inner diameter side is formed on substantially the entire periphery on the collar outer peripheral surface 31, and a cover inner peripheral surface engaging with the collar outer peripheral groove 34 is formed on the inner peripheral surface of the collar support portion 21 of the lower cover 20. The projection 24 is formed over substantially the entire circumference.

  On the outer peripheral surface at a predetermined position of the lower shaft 6, an engagement groove 27 that is recessed toward the inner diameter side is formed over substantially the entire circumference. The height (groove width) of the engaging groove 27 along the axial direction is such that the inner peripheral edge of the collar 30 is rotatably engaged with the engaging groove 27. ) Is set slightly larger. The collar 30 can be divided into two color divisions 30A and 30B by a division surface passing through the center of the color through-hole 33. The two color divisions 30A and 30B are engaged with each other in a combined state to engage with each other. The form as 30 is maintained. The inner peripheral edge of one of the color split bodies 30A is inserted into the engagement groove 27 of the lower shaft 6 from one side, and the other color split body 30B is inserted into the engagement groove 27 from the other side, and the one color split body 30A is inserted. By combining with, the collar 30 is engaged with the engagement groove and attached. In such a collar mounting state, the inner peripheral surface 32 of the collar and the outer peripheral surface of the lower shaft 6 come close to or come into contact with each other over the entire circumference, so that the relative rotation between the collar 30 and the lower shaft 6 is allowed and the relative movement in the axial direction is allowed. It is forbidden. The collar 30 may be attached to the lower shaft 6 in another form so that the relative rotation between the collar 30 and the lower shaft 6 is allowed and the relative movement in the axial direction is prohibited.

  After attaching the collar 30 to the lower shaft 6, the cover inner peripheral protrusion 24 is engaged with the collar outer peripheral groove 34, and the annular band member 16 is tightened from the outer periphery of the collar support 21, so that the collar support 21 is elastic. The collar 30 is fixedly supported by the collar support portion 21 in a state in which the collar 30 is deformed and the inner peripheral surface of the collar support portion 21 is in surface contact over the entire circumference of the collar outer peripheral surface 31 and is in close contact therewith.

  The flange portion 22 of the lower cover 20 has a flange shape that overlaps the floor panel 4 from above outside the entire periphery of the shaft insertion hole 11, and is fixed to the floor panel 4 in a sealed manner. In the present embodiment, a sheet-like sealing material 17 having an opening 18 for exposing the shaft insertion hole 11 is superimposed on the upper surface of the floor panel 4 at the periphery of the shaft insertion hole 11, and the lower cover 20 is provided on the upper surface of the sealing material 17. The flange portion 22 is overlapped, the lower end mounting portion 15 of the upper cover 12 is overlapped on the upper surface of the flange portion 22, and a plurality of (four in the present embodiment) of the lower end mounting portion 15 are floor paneled by bolts 19 and nuts (not shown). Fasten to 4. Thus, the upper cover 12 and the lower cover 20 are fixed to the floor panel 4 in a state where the flange portion 22 of the lower cover 20 is sandwiched between the lower end mounting portion 15 of the upper cover 12 and the floor panel 4. Notched bolt insertion portions 25 and 26 through which the bolts 19 are inserted are formed on the outer peripheral edge of the flange portion 22 and the outer peripheral edge of the sealing material 17. In addition, the lower cover 20 may be fixed to the floor panel 4 alone, and in this case, the flange portion 22 may be overlapped on the lower surface of the floor panel 4 from below.

  The surrounding portion 23 of the lower cover 20 extends in a funnel shape from the flange portion 22 toward the lower collar supporting portion 21 with a reduced diameter, and closes between the collar supporting portion 21 and the flange portion 22. In the surrounding portion 23 of the lower cover 20, an easily deformable portion 41 that is easily deformed according to the tilt of the lower shaft 6 is formed. Although the easily deformable portion 41 of the present embodiment has a shape that is folded in one step in a wave shape, the shape of the easily deformable portion is not limited to this. For example, as shown in FIG. The deformation part 42 may be used. In addition, if the deformation request for the surrounding portion 23 is low, the surrounding portion 23 having no easily deformable portion may be used. Further, the collar support 21 and the collar 30 may be arranged above the flange 22 and the floor panel 4. In this case, the surrounding portion 23 extends in a funnel shape from the flange portion 22 toward the upper collar supporting portion 21 while reducing its diameter.

  In the present embodiment, the collar inner peripheral surface 32 of the collar 30 is close to or in contact with the outer peripheral surface of the steering shaft 5 (lower shaft 6) over the entire circumference, and the color support portion 21 of the lower cover 20 is located on the outer peripheral surface of the collar 30. 31, the flange-shaped flange portion 22 of the lower cover 20 overlaps the floor panel 4 outside the entire peripheral edge of the shaft insertion hole 11 and is fixed in an airtight manner, and the surrounding portion 23 of the lower cover 20 is fixed. Closes between the collar support 21 and the flange 22.

  The shaft insertion hole 11 is formed in an elongated shape larger than the outer diameter of the lower shaft 6 so as not to interfere with the lower shaft 6 that tilts when the cab 1 is tilted. 11 is closed by the lower cover 20 and the collar 30 as described above, so that noise (engine sound, running sound, etc.) outside the vehicle cabin below the floor panel 4 is reduced by the gap between the lower shaft 6 and the shaft insertion hole 11. From the vehicle compartment 2 can be suppressed.

  The tilting of the steering shaft 5 when the cab 1 is tilted or the like is allowed by the elastic deformation of the surrounding portion 23 of the lower cover 20.

  In addition, since the relative rotation between the collar 30 and the steering shaft 5 is allowed, the rotation of the steering shaft 5 in accordance with the input of the steering operation is not blocked by the collar 30, and the steering shaft 5 functions reliably. be able to.

  Next, a second embodiment of the present invention will be described with reference to FIGS. In addition, in this embodiment, a wire insertion hole (wire insertion portion) 35 is formed in the collar 30 of the first embodiment, and the other configuration is the same as that of the first embodiment. The same reference numerals are given to the same components, and the detailed description is omitted.

  As shown in FIGS. 6 and 7, a wire W that connects the lower shaft 6 and the upper shaft 7 to prevent the expansion and contraction of the steering shaft 5 can be inserted into the collar 30 when the steering shaft 5 is mounted on the vehicle body side. Two circular wire insertion holes 35 are formed through the steering shaft 5 in the axial direction. Instead of the wire insertion hole 35, a groove (wire insertion portion) penetrating in the axial direction of the steering shaft 5 may be formed in the outer peripheral surface of the collar 30 by notch. The number of the wire insertion holes 35 is not limited to two, and may be one or three or more.

  When the steering shaft 5 is mounted on the vehicle body side, the wire W is inserted into the wire insertion hole 35, and the lower shaft 6 and the upper shaft 7 are connected by the wire W to prevent the steering shaft 5 from expanding and contracting. After assembling the steering shaft 5 to the vehicle body, and after assembling the steering shaft 5, the wire W is removed to make the steering shaft 5 extendable. Therefore, the assembling work of the steering shaft 5 can be easily performed.

  Next, a third embodiment of the present invention will be described with reference to FIG. This embodiment is the same as the second embodiment except that the cover member 36 is provided on the collar 30 of the second embodiment, and the other components are the same as those of the second embodiment. A detailed description is omitted by attaching reference numerals.

  As shown in FIGS. 8A and 8B, a lid member 36 for opening and closing the wire insertion hole 35 is provided on the lower surface of the collar 30 exposed at the lower end of the opening of the collar support portion 21 of the lower cover 20. Is provided. The lid member 36 has a flat plate shape (a disk shape in the example of FIG. 8), and is supported by the collar 30 so as to be rotatable about a hinge shaft 37. The lid member 36 is configured to be hard to rotate so as to open and close only during a forcible opening and closing operation, and is held at an open position or a closed position after the opening and closing operation. For example, as shown by a two-dot chain line in FIG. 8A, a locking piece 38 is protruded from the lid member 36, and two locking projections 39 are separately protruded from the collar 30 to protrude. The cover member 36 is configured to engage with the collar 30 in the closed position, such that the locking piece 38 enters between the two locking projections 39 and locks when the 36 is closed. Is also good. Further, the lid member 36 may be provided on the upper surface of the collar 30.

  Since the wire insertion hole 35 can be closed by the cover member 36 when the vehicle is used after the steering shaft 5 is assembled, the effect of suppressing the entry of noise into the vehicle compartment 2 from below the floor panel 4 is enhanced. be able to.

  Further, a coil spring (urging means) 40 for urging the lid member 36 in the closing direction may be provided on the hinge shaft 37 as shown by a two-dot chain line in FIG. The means for urging the lid member 36 in the closing direction is not limited to the coil spring 40, but may be other means such as a leaf spring.

  Since the lid member 36 is urged in the closing direction, it is possible to prevent the wire insertion hole 35 from being kept open after the steering shaft 5 is assembled and the wire W is removed, and the floor panel can be prevented. Thus, the effect of suppressing the intrusion of noise into the vehicle compartment 2 from beneath from below 4 can be reliably increased.

  As described above, the present invention has been described based on the above-described embodiment. However, the present invention is not limited to the content of the above-described embodiment, and can be appropriately changed without departing from the present invention. That is, other embodiments, examples, operation techniques, and the like performed by those skilled in the art based on this embodiment are all included in the scope of the present invention.

  In the above embodiment, the case where the steering shaft 5 is inserted through the shaft insertion hole 11 of the floor panel 4 of the tiltable cab overtrack has been described. However, the vehicle may be other than the tiltable cab overtrack. The hole 11 may be formed in a panel other than the floor panel 4 (for example, the dash panel 3).

  INDUSTRIAL APPLICABILITY The present invention is applicable to a vehicle in which a steering shaft is inserted through a shaft insertion hole of a panel.

1: Cab 2: Cab 3: Dash panel 4: Floor panel (panel)
5: Steering shaft 6: Lower shaft (proximal shaft)
7: Upper shaft (tip side shaft)
8: Steering wheel 9: Steering gear box 10: Lower joint 11: Shaft insertion hole 12: Upper cover 13: Cover body 14: Upper bellows 15: Lower end mounting part 16: Band member 17: Seal material 18: Opening hole 19: Bolt 20: Lower cover 21: Collar support portion 22: Flange portion 23: Enclosure portion 24: Cover inner peripheral projections 25, 26: Bolt insertion portion 27: Engagement groove 30: Collars 30A, 30B: Collar split body 31: Collar outer peripheral surface 32: collar inner peripheral surface 33: collar through hole 34: collar outer peripheral groove 35: wire insertion hole (wire insertion portion)
36: lid member 37: hinge shaft 38: locking piece 39: locking projection 40: coil spring (biasing means)
41, 42: easily deformable portion W: wire

Claims (5)

A shaft insertion hole cover structure of a vehicle in which a steering shaft is inserted through a shaft insertion hole provided in a panel that partitions a vehicle compartment,
A collar having an annular shape having a collar outer peripheral surface and a collar inner peripheral surface, wherein the collar inner peripheral surface defines a circular color through hole through which the steering shaft is inserted;
A collar supporting portion that is in surface contact with and adheres to the entire periphery of the collar outer peripheral surface, a flange-shaped flange portion that is fixed to the panel so as to overlap the panel outside the entire peripheral edge of the shaft insertion hole, and the flange portion, A surrounding portion that extends from the collar supporting portion and the flange portion while reducing the diameter in a funnel shape toward the collar supporting portion, and the collar supporting portion, the flange portion, and the surrounding portion. Is integrally formed by an elastic material, and the lower portion of the collar supporting portion fixedly supports the collar,
In the state where the inner peripheral surface of the collar and the outer peripheral surface of the steering shaft are close to or in contact with each other over the entire circumference, relative rotation with the steering shaft is allowed and relative movement in the axial direction is prohibited. A vehicle shaft insertion hole cover structure that engages with the steering shaft as described above. The shaft insertion hole cover structure according to claim 1, wherein
The steering shaft is configured to be extendable and contractable by a proximal shaft and a distal shaft that slidably engage in the axial direction,
The base shaft is inserted into the collar through-hole of the collar,
The collar includes a wire insertion portion that can insert a wire that connects the base end shaft and the distal end shaft to prevent expansion and contraction of the steering shaft when the steering shaft is mounted on the vehicle body side. A vehicle shaft insertion hole cover structure formed along the axial direction of the shaft. The shaft insertion hole cover structure according to claim 2, wherein
The wire insertion portion is a wire insertion hole penetrating in the axial direction of the steering shaft,
The cover structure for a vehicle shaft insertion hole, wherein the collar is provided with a lid member that closes the wire insertion hole so as to be openable. The shaft insertion hole cover structure according to claim 3, wherein
The cover member is urged in a closing direction. A shaft insertion hole cover structure for a vehicle, wherein: The shaft insertion hole cover structure according to any one of claims 1 to 4, wherein
A shaft insertion hole cover structure for a vehicle, wherein an easily deformable portion that is easily deformed according to the tilting of the steering shaft is provided in the surrounding portion of the lower cover.

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