JP2022184266A - steering shaft cover - Google Patents

Abstract

To improve noise barrier performance of a steering shaft cover.SOLUTION: A steering shaft cover 1 includes an inner cover 8 that covers a steering shaft 2, and an outer cover 9 that covers the outer circumferential side of the inner cover 8. The inner cover 8 includes: a first cylindrical portion 10 that covers the steering shaft 2; a first flange portion 11 extending out from one end of the first cylindrical portion 10 toward the outer circumferential side; and a second cylindrical portion 12 that is connected to the other end of the first cylindrical portion 10. A plurality of protruded portions 14 are formed on an inner circumferential surface 13 of the first cylindrical portion 10 at equal intervals in the circumferential direction of the first cylindrical portion 10.SELECTED DRAWING: Figure 3

Description

The present invention relates to a steering shaft cover.

In recent hybrid vehicles and electric vehicles, the required level of sound insulation performance required for the steering shaft cover is increasing in order to ensure the quietness of the vehicle interior.

For example, Patent Literature 1 discloses a steering shaft cover that seals between a steering shaft and a vehicle panel member through which the steering shaft passes. The steering shaft cover has a double structure in which a portion through which the steering shaft passes is a tubular inner cover and a tubular outer cover positioned on the outer peripheral side of the inner cover.

JP 2006-240511 A

However, in the steering shaft cover of Patent Document 1, noise from outside the vehicle enters the inner cover through the through hole of the panel member through which the steering shaft penetrates, and leaks into the vehicle through the inner cover and the outer cover. There is a risk of it coming out.

In other words, the conventional steering shaft cover has room for further improvement in improving the sound insulation performance.

A steering shaft cover according to the present invention seals a space between a steering shaft and a panel member of a vehicle through which the steering shaft penetrates, and is located on the vehicle interior side. An outer cover that covers the outer peripheral side of the cover is provided, and the inner cover includes a tubular first tubular portion that covers the steering shaft, and an annular first tubular portion that protrudes from one end of the first tubular portion to the outer peripheral side. 1 flange portion, and a plurality of protruding portions of the ridge are formed on the inner peripheral surface of the first cylindrical portion so as to be equidistant from each other.

The plurality of projecting portions may be formed parallel to the central axis of the first cylindrical portion.

The plurality of projecting portions may be formed so as to obliquely extend along the axial direction of the first cylindrical portion.

The plurality of projecting portions may be formed so as to spirally extend along the axial direction of the first cylindrical portion.

The inner cover may have an annular inner flange portion projecting inward from one end of the first cylindrical portion, and the inner flange portion may be formed to be spaced apart from the outer peripheral surface of the steering shaft. .

The plurality of protruding portions may be formed parallel to the central axis of the first cylindrical portion and staggered in the circumferential direction of the first cylindrical portion.

The plurality of protrusions comprises a plurality of first protrusions positioned on one end side of the first tubular portion and a plurality of second protrusions positioned on the other end side of the first tubular portion, The plurality of first protrusions and the plurality of second protrusions may be formed so that positions along the circumferential direction of the first tubular portion do not overlap each other.

In the steering shaft cover of the present invention, by providing a plurality of protrusions on the inner peripheral surface of the first cylindrical portion, noise entering the inner peripheral side of the inner cover from the outside of the vehicle can be reduced. It is possible to obtain a sound insulation effect against the noise of

1 is a perspective view of a steering shaft cover according to the present invention; FIG. 1 is a cross-sectional view of a main portion of a steering shaft cover according to a first embodiment of the present invention; FIG. FIG. 3 is a perspective view of the steering shaft cover of the first embodiment split in half along line BB of FIG. 2; FIG. 3 is a cross-sectional view of the steering shaft cover taken along line CC of FIG. 2; FIG. 5 is a cross-sectional view of a main part of a steering shaft cover according to a second embodiment of the invention; FIG. 6 is a perspective view of the steering shaft cover of the second embodiment split in half along line DD of FIG. 5; FIG. 6 is a perspective view of the steering shaft cover viewed from the direction of arrow E in FIG. 5; FIG. 5 is a cross-sectional view of a main part of a steering shaft cover according to a third embodiment of the invention; FIG. 9 is a perspective view of the steering shaft cover of the third embodiment split in half at a position along line FF of FIG. 8; FIG. 11 is a cross-sectional view of a main portion of a steering shaft cover according to a fourth embodiment of the present invention; FIG. 11 is a perspective view of the steering shaft cover of the fourth embodiment split in half along line GG of FIG. 10; FIG. 11 is a cross-sectional view of a main portion of a steering shaft cover according to a fifth embodiment of the present invention; FIG. 13 is a perspective view of the steering shaft cover of the fifth embodiment split in half along line HH of FIG. 12;

An embodiment of the present invention will now be described in detail with reference to the drawings.

1 to 4 show a steering shaft cover 1 according to a first embodiment of the invention. FIG. 1 is a perspective view of the steering shaft cover 1. FIG. FIG. 2 is a cross-sectional view of the steering shaft cover 1 of the first embodiment of the present invention, and is a cross-sectional view of the steering shaft cover 1 along line AA in FIG. FIG. 3 is a perspective view of the steering shaft cover 1 split in half along line BB of FIG. FIG. 4 is a cross-sectional view of the steering shaft cover 1 taken along line CC of FIG.

As shown in FIGS. 1 and 2, a steering shaft cover 1 for a vehicle is positioned on the passenger compartment side to seal between a steering shaft 2 and a dash panel 3 as a panel member through which the steering shaft 2 passes. is doing. The steering shaft cover 1 is through which the steering shaft 2 passes.

As shown in FIG. 2, the dash panel 3 separates the engine room 4 and the passenger compartment 5 from each other. A through hole 6 through which the steering shaft 2 passes is formed in the dash panel 3 . The dash panel 3 is folded back toward the vehicle interior 5 along the entire periphery of the through hole 6, thereby having an annular projection 7 protruding from the dash panel 3 toward the vehicle interior 5. .

As shown in FIGS. 2 to 4, the steering shaft cover 1 is roughly composed of an inner cover 8 covering the steering shaft 2 and an outer cover 9 covering the outer peripheral side of the inner cover 8. As shown in FIGS. The steering shaft cover 1 has a double structure consisting of an inner cover 8 and an outer cover 9 to suppress transmission (propagation) of noise from the engine room 4 outside the vehicle compartment to the vehicle compartment 5 .

The steering shaft cover 1 is made of a material such as thermoplastic resin or thermoplastic elastomer.

As shown in FIGS. 2 to 4, the inner cover 8 includes a tubular first tubular portion 10 that covers the steering shaft 2, and an annular first flange projecting outward from one end of the first tubular portion 10. and a tubular second tubular portion 12 connected to the other end of the first tubular portion 10 .

The first tubular portion 10 has an inner diameter larger than that of the steering shaft 2, and is separated from the outer peripheral surface of the steering shaft 2 over the entire circumference in the assembled state.

A plurality of projecting portions 14 are formed on the inner peripheral surface 13 of the first tubular portion 10 at regular intervals in the circumferential direction of the first tubular portion 10 . The plurality of protruding portions 14 are protrusions that protrude from the inner peripheral surface 13 of the first tubular portion 10 toward the inside of the first tubular portion 10 and extend along the axial direction of the first tubular portion 10 . The plurality of projecting portions 14 are formed so that their centers are parallel to the central axis L of the first tubular portion 10 .

The plurality of protruding portions 14 protrude from the inner peripheral surface 13 of the first cylindrical portion 10 by a predetermined constant amount, and the protruding amounts are the same.

The amount of projection from the inner peripheral surface 13 of the first cylindrical portion 10 is set so that the plurality of projecting portions 14 are separated from the outer peripheral surface of the steering shaft 2 over the entire length in the assembled state.

The first flange portion 11 has an inner portion 15 on the inner peripheral side connected to one end of the first cylindrical portion 10, and an outer portion 16 located on the outer peripheral side of the inner portion 15, and the entire portion extends radially. It is formed to have a stepped cross section along the . The inner portion 15 is positioned inside the through hole 6 . The lower surface side of the outer portion 16 is in close contact with the dash panel 3 around the perimeter of the through hole 6 . That is, the inner cover 8 is in close contact with the dash panel 3 on the outer peripheral side of the first flange portion 11 . In the assembled state of the first flange portion 11 , the projection 7 of the dash panel 3 is in close contact with the step 17 on the inner side (inner peripheral side) formed at the boundary portion between the inner portion 15 and the outer portion 16 . That is, the first flange portion 11 is formed so that the inner step 17 is in close contact with the annular protrusion 7 formed around the through hole 6 .

The second tubular portion 12 is connected to the first tubular portion 10 so as to be coaxial with the first tubular portion 10 . The second tubular portion 12 is formed to be thinner than the first tubular portion 10 . The second tubular portion 12 is formed to have the same inner diameter as the first tubular portion 10 . The second tubular portion 12 seals the outer peripheral surface of the steering shaft 2 via an annular seal member 18 . Reference numeral 19 in FIG. 2 denotes an annular fixing member for pressing the sealing member 18 attached to the outer periphery of the second cylindrical portion 12 against the steering shaft 2 to ensure stable sealing performance. In other words, the steering shaft cover 1 is configured so that the sealing member 18 is always kept in close contact with the outer peripheral surface of the steering shaft 2 .

As shown in FIGS. 2 to 4, the outer cover 9 includes a third tubular portion 22 having a diameter larger than that of the first tubular portion 10, and an annular ring projecting from one end of the third tubular portion 22 to the outer peripheral side. and an inner wall portion 24 projecting from the other end of the third cylindrical portion 22 to the inner peripheral side.

The third tubular portion 22 is separated from the outer peripheral surface of the first tubular portion 10 over the entire circumference. The second flange portion 23 has an inner portion 25 on the inner peripheral side connected to one end of the third tubular portion 22, and an outer portion 26 located on the outer peripheral side of the inner portion 25, and the entire portion extends radially. It is formed to have a stepped cross section along the . The second flange portion 23 is formed so that an inner (inner peripheral side) step 27 formed at a boundary portion between the inner portion 25 and the outer portion 26 overlaps with an outer (peripheral) step 20 of the first flange portion 11 . and is in close contact with the upper surface of the first flange portion 11 . That is, the inner portion 25 of the second flange portion 23 is in close contact with the inner portion 15 of the first flange portion 11 . The outer portion 26 of the second flange portion 23 is in close contact with the outer portion 16 of the first flange portion 11 .

The inner wall portion 24 has an inner peripheral end 24 a attached to an annular groove 12 a formed in the outer peripheral surface of the second tubular portion 12 .

As shown in FIG. 2, the steering shaft cover 1 is fixed to the dash panel 3 with a bracket 28. As shown in FIG. That is, in the steering shaft cover 1 , the outer portion 26 of the second flange portion 23 superimposed on the outer portion 16 of the first flange portion 11 is pressed against the dash panel 3 by the bracket 28 . The steering shaft cover 1 is fixed to the dash panel 3 by sandwiching the outer peripheries of the first flange portion 11 and the second flange portion 23 between the dash panel 3 and the bracket 28 . . This bracket 28 is fixed to the dash panel 3 with a fixing bolt (not shown). A plurality of (four in this embodiment) holes 29 corresponding to the fixing bolts are formed in the first flange portion 11 and the second flange portion 23 .

In the steering shaft cover 1 of the first embodiment, the core (not shown) used for forming the shape of the inner peripheral side of the first tubular portion 10 of the inner cover 8 is, for example, the first tubular portion It is possible to pull out from one end side of 10 or the other end side.

In the steering shaft cover 1 of the first embodiment described above, a plurality of projecting portions 14 are formed on the inner peripheral surface 13 of the first tubular portion 10 .

As a result, the steering shaft cover 1 reflects the noise entering from the outside of the passenger compartment to the inner peripheral side of the inner cover 8 with the plurality of projecting portions 14 provided on the inner peripheral surface 13 of the first tubular portion 10. The sound pressure level of noise entering the inner peripheral side of the inner cover 8 can be reduced.

In other words, the steering shaft cover 1 is provided with a plurality of projecting portions 14 on the inner peripheral surface 13 of the first tubular portion 10, thereby reducing noise entering the inner peripheral side of the inner cover 8 from the outside of the vehicle compartment. It is possible to improve the sound insulation effect against noise from the outside of the passenger compartment. The steering shaft cover 1 has a configuration that is more advantageous in reducing noise entering the inner peripheral side of the inner cover 8 from the outside of the vehicle compartment as the protrusions 14 protrude from the inner peripheral surface 13 to a greater extent. Become.

Further, in the steering shaft cover 1 of the first embodiment, a plurality of protruding portions 14 are formed on the inner peripheral surface 13 of the first tubular portion 10 so as to be equally spaced from each other. Therefore, in the steering shaft cover 1 of the first embodiment, more protrusions 14 are provided in the same area than in the case where the plurality of protrusions 14 are not provided on the inner peripheral surface 13 of the first tubular portion 10 at regular intervals. can be formed.

In other words, in the steering shaft cover 1 of the first embodiment, since the plurality of projections 14 are provided at regular intervals, it is possible to increase the total surface area of the plurality of projections 14, thereby improving the sound insulation effect. It is advantageous to let In the steering shaft cover 1 , the larger the total surface area of the plurality of projecting portions 14 , the more likely the noise entering the inner peripheral side of the inner cover 8 is reflected by the plurality of projecting portions 14 . This configuration is advantageous for reducing the sound pressure level of noise entering the peripheral side.

Hereinafter, another embodiment of the present invention will be described, but the same constituent elements as those of the first embodiment described above are denoted by the same reference numerals, and overlapping descriptions will be omitted.

A steering shaft cover 31 according to a second embodiment of the present invention will be described with reference to FIGS. 5 to 7. FIG. FIG. 5 is a cross-sectional view of essential parts of a steering shaft cover 31 according to a second embodiment of the present invention, and is a cross-sectional view of the steering shaft cover 31 corresponding to a position along line AA in FIG. FIG. 6 is a perspective view of the steering shaft cover 31 split in half along line DD of FIG. 7 is a perspective view of the steering shaft cover 31 viewed from the direction of arrow E in FIG. 5, and is a perspective view of the first flange portion 11 of the inner cover 8 of the steering shaft cover 31 of the second embodiment.

The steering shaft cover 31 of the second embodiment has substantially the same structure as the steering shaft cover 1 of the first embodiment described above, but has an annular inner side projecting from one end of the first tubular portion 10 toward the inner peripheral side. It has a flange portion 32 . In addition, in FIG. 7, the inner flange portion 32 is hatched for the sake of convenience.

The inner flange portion 32 is formed such that the inner peripheral side end serving as the tip is separated from the outer peripheral surface of the steering shaft 2 in the assembled state.

In the steering shaft cover 31 of the second embodiment, a core (not shown) used for forming the shape of the inner peripheral side of the first cylindrical portion 10 of the inner cover 8 is, for example, the inner flange portion 32 and the inner flange portion 32. It is pulled out from one end side of the first tubular portion 10 so as not to interfere.

With such a steering shaft cover 31 of the second embodiment, it is possible to achieve substantially the same effects as the steering shaft cover 1 of the first embodiment described above. In addition, the steering shaft cover 31 of the second embodiment can reduce noise entering the inner peripheral side of the inner cover 8 from the outside of the vehicle compartment by the inner flange portion 32, thereby further insulating the noise from the outside of the vehicle compartment. effect can be obtained.

A steering shaft cover 35 according to a third embodiment of the present invention will be described with reference to FIGS. 8 and 9. FIG. FIG. 8 is a cross-sectional view of the essential parts of the steering shaft cover 35 of the third embodiment of the invention, and is a cross-sectional view of the steering shaft cover 35 corresponding to the position along line AA in FIG. FIG. 9 is a perspective view of the steering shaft cover 35 split in half along line FF of FIG.

The steering shaft cover 35 of the third embodiment has substantially the same structure as the steering shaft cover 1 of the first embodiment described above, but the plurality of protruding portions 14 are aligned with the central axis L of the first cylindrical portion 10. They are formed so as to be parallel and staggered (staggered) in the circumferential direction of the first tubular portion 10 . More specifically, the plurality of projecting portions 14 includes a plurality of first projecting portions 14 a located on one end side of the first tubular portion 10 and a plurality of second projecting portions located on the other end side of the first tubular portion 10 . and a portion 14b. The plurality of first projecting portions 14a and the plurality of second projecting portions 14b are formed so that positions along the circumferential direction of the first cylindrical portion 10 do not overlap each other.

The plurality of first projecting portions 14a are formed at regular intervals in the circumferential direction of the first tubular portion 10 . The first protruding portion 14 a is a protrusion that protrudes from the inner peripheral surface 13 of the first tubular portion 10 toward the inside of the first tubular portion 10 and extends along the axial direction of the first tubular portion 10 . The plurality of first projecting portions 14a are formed so that their centers are parallel to the central axis L of the first cylindrical portion 10. As shown in FIG. The plurality of first projecting portions 14a project from the inner peripheral surface 13 of the first cylindrical portion 10 by a predetermined constant amount, and the projecting amounts are the same. The amount of projection of the plurality of first projecting portions 14a from the inner peripheral surface 13 of the first cylindrical portion 10 is set so that the plurality of first projecting portions 14a are separated from the outer peripheral surface of the steering shaft 2 over the entire length in the assembled state.

The plurality of second protruding portions 14b are formed so as to be equidistant from each other in the circumferential direction of the first cylindrical portion 10. As shown in FIG. The second protruding portion 14 b is a protrusion that protrudes from the inner peripheral surface 13 of the first tubular portion 10 toward the inside of the first tubular portion 10 and extends along the axial direction of the first tubular portion 10 . The plurality of second projecting portions 14b are formed so that their centers are parallel to the central axis L of the first tubular portion 10. As shown in FIG. The plurality of second projecting portions 14b project from the inner peripheral surface 13 of the first cylindrical portion 10 by a predetermined constant amount, and the projecting amounts are the same. The amount of protrusion of the plurality of second protrusions 14b from the inner peripheral surface 13 of the first tubular portion 10 is set so that the plurality of second protrusions 14b are separated from the outer peripheral surface of the steering shaft 2 over the entire length in the assembled state.

In the steering shaft cover 35 of the third embodiment, a core (not shown) used for forming the shape of the inner peripheral side of the first cylindrical portion 10 and the second cylindrical portion 12 of the inner cover 8 is , a first core forming the first protruding portion 14a and a second core forming the second protruding portion 14b. Then, the first core is pulled out from one end side of the first tubular portion 10 so as not to interfere with the second projecting portion 14b. The second core is pulled out from the other end side of the first tubular portion 10 so as not to interfere with the first projecting portion 14a.

With such a steering shaft cover 35 of the third embodiment, it is possible to achieve substantially the same effects as the steering shaft cover 1 of the first embodiment described above.

In addition, in the steering shaft cover 35 of the third embodiment, the plurality of first protrusions 14a and the plurality of second protrusions 14b are formed so as to partially overlap along the circumferential direction of the first tubular portion 10. You may do so.

A steering shaft cover 40 according to a fourth embodiment of the present invention will be described with reference to FIGS. 10 and 11. FIG. FIG. 10 is a cross-sectional view of essential parts of a steering shaft cover 40 according to a fourth embodiment of the present invention, and is a cross-sectional view of the steering shaft cover 40 corresponding to the position along line AA in FIG. FIG. 11 is a perspective view of the steering shaft cover 40 split in half along line GG in FIG.

The steering shaft cover 40 of the fourth embodiment has substantially the same structure as the steering shaft cover 1 of the first embodiment described above. It is formed to extend obliquely. Moreover, the plurality of protruding portions 14 are formed so as to be equidistant from each other in the circumferential direction of the first tubular portion 10 .

In the steering shaft cover 40 of the fourth embodiment, a core (not shown) used to form the shape of the inner circumference of the first cylindrical portion 10 of the inner cover 8 can be pulled out while being rotated. , for example, it can be pulled out from one end side or the other end side of the first tubular portion 10 .

With such a steering shaft cover 40 of the fourth embodiment, it is possible to achieve substantially the same effects as the steering shaft cover 1 of the first embodiment described above.

A steering shaft cover 45 according to a fifth embodiment of the present invention will be described with reference to FIGS. 12 and 13. FIG. FIG. 12 is a cross-sectional view of essential parts of a steering shaft cover 45 according to a fifth embodiment of the present invention, and is a cross-sectional view of the steering shaft cover 45 corresponding to a position along line AA in FIG. 13 is a perspective view of the steering shaft cover 45 split in half along line HH in FIG. 12. FIG.

The steering shaft cover 45 of the fifth embodiment has substantially the same structure as the steering shaft cover 1 of the first embodiment described above. It is formed to extend spirally. Moreover, the plurality of protruding portions 14 are formed so as to be equidistant from each other in the circumferential direction of the first tubular portion 10 .

In the steering shaft cover 45 of the fifth embodiment, a core (not shown) used for forming the shape of the inner peripheral side of the first cylindrical portion 10 of the inner cover 8 can be pulled out while being rotated. , for example, it can be pulled out from one end side or the other end side of the first tubular portion 10 .

In such a steering shaft cover 45 of the fifth embodiment, substantially the same effects as those of the steering shaft cover 1 of the first embodiment described above can be obtained.

Although specific embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention.

For example, in the steering shaft cover 31 of the second embodiment described above, the plurality of first projecting portions 14a and the plurality of second projecting portions 14b are formed to extend obliquely along the axial direction of the first cylindrical portion 10. may

Further, in the steering shaft cover 31 of the second embodiment described above, the plurality of first projecting portions 14a and the plurality of second projecting portions 14b are formed to spirally extend along the axial direction of the first cylindrical portion 10. You may

Further, in each of the above-described embodiments, the plurality of projecting portions 14 can be set so that the intervals between them in the circumferential direction of the first tubular portion 10 are not equal.

Further, in each of the above-described embodiments, the amount of protrusion of the plurality of protrusions 14 from the inner peripheral surface 13 of the first tubular portion 10 may be different for each protrusion 14 .

DESCRIPTION OF SYMBOLS 1... Steering shaft cover 3... Dash panel 8... Inner cover 9... Outer cover 10... First tubular part 11... First flange part 12... Second tubular part 13... Inner peripheral surface 14... Protruding part 22... Third Cylindrical portion 23... Second flange portion 24... Inner wall portion

Claims (7)

A steering shaft cover that is located on the vehicle interior side and seals between the steering shaft and a panel member of the vehicle through which the steering shaft penetrates,
An inner cover covering the steering shaft and an outer cover covering an outer peripheral side of the inner cover,
The inner cover has a tubular first tubular portion that covers the steering shaft, and an annular first flange portion that protrudes outward from one end of the first tubular portion,
A steering shaft cover, wherein a plurality of protruding portions are formed on the inner peripheral surface of the first cylindrical portion at regular intervals. 2. The steering shaft cover according to claim 1, wherein the plurality of protrusions are formed so as to be parallel to the central axis of the first tubular portion. 2. The steering shaft cover according to claim 1, wherein the plurality of projecting portions are formed so as to obliquely extend along the axial direction of the first cylindrical portion. 2. The steering shaft cover according to claim 1, wherein the plurality of projecting portions are formed so as to spirally extend along the axial direction of the first cylindrical portion. The inner cover has an annular inner flange portion projecting inwardly from one end of the first tubular portion,
The steering shaft cover according to any one of claims 1 to 4, wherein the inner flange portion is formed so as to be separated from the outer peripheral surface of the steering shaft. 2. The plurality of projecting portions according to claim 1, wherein the plurality of projecting portions are formed parallel to the central axis of the first cylindrical portion and alternate in the circumferential direction of the first cylindrical portion. steering shaft cover. The plurality of protrusions comprises a plurality of first protrusions positioned on one end side of the first tubular portion and a plurality of second protrusions positioned on the other end side of the first tubular portion,
7. The plurality of first projections and the plurality of second projections are formed so as not to overlap each other along the circumferential direction of the first tubular portion. steering shaft cover.

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