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JP-7854843-B2 - Dust cover

JP7854843B2JP 7854843 B2JP7854843 B2JP 7854843B2JP-7854843-B2

Inventors

  • 森山 誠一

Assignees

  • ＮＳＫステアリング＆コントロール株式会社

Dates

Publication Date
20260507
Application Date
20220422

Claims (11)

  1. A cylindrical bush is attached to the outer surface of the steering shaft, which penetrates a cylindrical member of the dash panel and extends in the axial direction of the central axis, and extends along the circumferential direction about the axis of the central axis, A bellows that seals the gap between the cylindrical member and the bush, Equipped with, The bellows includes a sealing portion that protrudes toward the outer circumferential surface of the steering shaft and whose tip abuts against the outer circumferential surface, The bellows is softer than the bushing. The bellows comprises a cylindrical annular portion extending circumferentially along the outer circumference of the bush, a radial wall portion extending radially outward from the annular portion, and a bent portion bending axially from the radially outer end of the radial wall portion. The aforementioned sealing portion is From the radial wall portion, protruding toward the outer circumferential surface of the steering shaft, The aforementioned sealing portion is A base portion joined to the radial wall portion, The base portion comprises a lip portion provided on the opposite side in the axial direction from the radial wall portion and having the tip portion, The radial inner end of the base portion is located radially inward from the inner circumferential surface of the annular portion. The aforementioned bush, The annular portion and the base portion abut against each other, Dust cover.
  2. The bent portion and the base portion are separated radially and face each other. The dust cover according to claim 1 .
  3. A cylindrical bush is attached to the outer surface of the steering shaft, which penetrates a cylindrical member of the dash panel and extends in the axial direction of the central axis, and extends along the circumferential direction about the axis of the central axis, A bellows that seals the gap between the cylindrical member and the bush, Equipped with, The bellows includes a sealing portion that protrudes toward the outer circumferential surface of the steering shaft and whose tip abuts against the outer circumferential surface, The bellows is softer than the bushing. The aforementioned sealing portion is A cylindrical portion extending circumferentially along the outer circumference of the bush, A first seal portion is provided on one side in the axial direction of the cylindrical portion, and the tip on the one side in the axial direction is in contact with the outer circumferential surface of the steering shaft, The device comprises a second seal portion provided on the other axial side of the cylindrical portion, the tip of which on the other axial side contacts the outer circumferential surface of the steering shaft, Dust cover.
  4. The bellows comprises a cylindrical annular portion that extends along the outer circumference of the cylindrical portion and is joined to the outer circumference of the cylindrical portion. The dust cover according to claim 3 .
  5. One of the annular portion and the cylindrical portion has a protrusion, and the other has a recess that fits into the protrusion. The dust cover according to claim 4 .
  6. The aforementioned protrusion comprises a base portion and a tip portion provided at the tip of the base portion. The axial length of the tip portion is greater than the axial length of the base portion. The dust cover according to claim 5 .
  7. The annular portion and the cylindrical portion are two-color molded products. The dust cover according to claim 5 or 6 .
  8. The bellows comprises a first radial wall portion extending radially outward from one axial side of the cylindrical portion, and a second radial wall portion extending radially outward from the other axial side of the outer circumference of the cylindrical portion. The dust cover according to claim 3 .
  9. The radially inner ends of the first radial wall portion and the second radial wall portion each have a protrusion that projects in the axial direction. The cylindrical portion has a recess that fits into the convex portion. The dust cover according to claim 8 .
  10. The radially inner ends of the first radial wall and the second radial wall each have a joint that is joined to the outer circumference of the cylindrical portion, with the axial distance increasing as it moves radially inward. The dust cover according to claim 8 .
  11. The aforementioned joint is bonded to the outer circumference of the cylindrical portion. The dust cover according to claim 10 .

Description

This disclosure relates to a dust cover positioned in the gap between the steering shaft and the dashboard panel. A dust cover may be provided in the gap between the vehicle's steering shaft and the passage through the dashboard panel (see, for example, Patent Document 1). The dust cover described in Patent Document 1 comprises a bellows, a cylindrical bush attached to the steering shaft, and two sealing members vulcanized and bonded to one axial side and the other side of the bush. The sealing members have their tips in contact with the outer surface of the steering shaft, preventing dust and other particles from entering the vehicle interior from outside (e.g., the engine compartment). Japanese Patent Publication No. 2019-6268 Figure 1 is a schematic diagram of the steering device of the first embodiment.Figure 2 is a perspective view of the steering device of the first embodiment.Figure 3 is a cross-sectional view of a dust cover attached to a vehicle.Figure 4 is a front view of the dust cover according to the first embodiment.Figure 5 is a cross-sectional view taken along line V-V in Figure 4.Figure 6 is a cross-sectional view showing the bellows of Figure 5.Figure 7 is a cross-sectional view of the dust cover of the second embodiment.Figure 8 is a cross-sectional view showing a portion of Figure 7.Figure 9 is a cross-sectional view of the dust cover according to the third embodiment.Figure 10 is a cross-sectional view of the dust cover of Modification 1 according to the third embodiment.Figure 11 is a cross-sectional view of the dust cover of the fourth embodiment, and corresponds to Figure 5 with the mounting member and the parts corresponding to the first fitting portion and the second fitting portion removed.Figure 12 is a cross-sectional view of a modified example 2 of the fourth embodiment of the dust cover, and corresponds to Figure 5 with the mounting member and the parts corresponding to the first fitting part and the second fitting part removed.Figure 13 is a cross-sectional view of a modified example 3 of the fourth embodiment of the dust cover, and corresponds to Figure 5 with the mounting member and the parts corresponding to the first fitting portion and the second fitting portion removed.Figure 14 is a cross-sectional view of a modified example 4 of the fourth embodiment of the dust cover, and corresponds to Figure 5 with the mounting member and the parts corresponding to the first fitting portion and the second fitting portion removed.Figure 15 is a cross-sectional view of a modified example 5 of the fourth embodiment of the dust cover, and corresponds to Figure 5 with the mounting member and the parts corresponding to the first fitting part and the second fitting part removed.Figure 16 is a cross-sectional view of a modified example 6 of the fourth embodiment of the dust cover, and corresponds to Figure 5 with the mounting member and the parts corresponding to the first fitting part and the second fitting part removed.Figure 17 is a cross-sectional view of the dust cover of the fifth embodiment, and corresponds to Figure 5 with the mounting member and the parts corresponding to the first fitting portion and the second fitting portion removed.Figure 18 is a cross-sectional view of a modified example 7 of the fifth embodiment of the dust cover, and corresponds to Figure 5 with the mounting member and the parts corresponding to the first fitting part and the second fitting part removed.Figure 19 is a cross-sectional view of a modified example 8 of the fifth embodiment of the dust cover, and corresponds to Figure 5 with the mounting member and the parts corresponding to the first fitting part and the second fitting part removed.Figure 20 is a schematic diagram that is an enlarged portion of Figure 19. The present invention will be described in detail below with reference to the drawings. However, the present invention is not limited to the embodiments described below. Furthermore, the components in the embodiments below include those easily conceivable by those skilled in the art, those substantially identical, and those within the so-called equivalent range. Moreover, the components disclosed in the embodiments below can be combined as appropriate. In each figure, the passenger compartment side is indicated as IN, and the engine compartment side is indicated as OUT. Also, in each embodiment and modification, identical components are denoted by the same reference numerals, and their description is omitted. [First Embodiment] First, a first embodiment of the present invention will be described. Figure 1 is a schematic diagram of the steering device of the first embodiment. Figure 2 is a perspective view of the steering device of the first embodiment. As shown in Figure 1, the steering device 80 comprises a steering wheel 81, a first steering shaft 82, a steering force assist mechanism 83, a first universal joint 84, a second steering shaft 85, and a second universal joint 86, and is connecte