JP2006131139A - Mounting structure of strut - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce generation of abnormal noise between an upper support and a suspension tower. <P>SOLUTION: The upper support 11 of a strut 10 is mounted on the suspension tower 20 by using each of bolts 30. In the suspension tower 20, a regular triangle shaped hole 20a is formed. In each corner part C1, C2 and C3 of the hole part 20a, each non-contact part which is not contact with an upper surface of the upper support 11 is formed. At the center outside of each side part L1, L2 and L3 of the hole part 20a, each bolt inserting hole 20b, 20c and 20d for inserting each bolt 30 is formed. When the upper support 11 is mounted on the suspension tower 20, each of the bolts 30, each of the bolt inserting holes 20b, 20c and 20d and each nut part 12b, 12c and 12d are coaxially arranged by using a tool 40. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a strut mounting structure in a vehicle.

  In a strut mounting structure in a vehicle, for example, as described in Patent Document 1 below, the strut upper support is attached to the suspension tower using a plurality of bolts around a hole provided in the suspension tower. It is configured. By the way, in the strut mounting structure described in Patent Document 1, when the upper support of the strut is attached to the suspension tower, a jig (hanger cap) for mounting the strut on the vehicle body is used.

  However, in this strut mounting structure, since the hole portion (jig mounting hole) provided in the suspension tower through which the jig can be inserted is formed to be relatively small, the upper surface of the upper support, the lower surface of the suspension tower, However, the contact is made not only in the vicinity of each bolt insertion hole but also in a wide range outside the hole excluding the vicinity of each bolt insertion hole. Therefore, when an input in the vertical direction is applied to the upper support, the upper support and the suspension tower repeatedly contact and separate at the contact surface outside the hole, and noise may be generated due to the sliding contact. There is.

  Further, in this strut mounting structure, since the jig is formed in a circular shape, the upper support cannot be positioned in the rotational direction with respect to the suspension tower. Therefore, the plurality of bolts provided in the upper support and the bolt insertion holes of the suspension tower may not be coaxial. In such a case, it is necessary to further rotate the upper support so that the bolts and the bolt insertion holes are coaxial with each other. Therefore, the mounting property when the upper support is attached to the suspension tower is deteriorated. There is also a risk.

  The above-described problem of the attachment of the upper support to the suspension tower is caused by the attachment means described in the following Patent Document 2, that is, the hole provided in the suspension tower is formed in a non-circular shape, This can be solved by making the outer peripheral shape of the jig to be mounted a non-circular shape.

However, in this strut mounting structure, even if the bolt insertion holes of the suspension tower are arranged at equal intervals in the circumferential direction of the hole, the shape of the hole provided in the suspension tower is formed in a non-circular shape. For this reason, when the upper support and the suspension tower are attached with the respective bolts, the region of the contact portion between the upper support and the suspension tower is unevenly distributed in the circumferential direction of the hole. The surface pressure in the circumferential direction of the part becomes non-uniform. For this reason, there exists a possibility that an upper support and a suspension tower may repeat contact and separation | spacing in a contact surface with low surface pressure. Therefore, even if the attachment means described in Patent Document 2 is used, the occurrence of abnormal noise cannot be eliminated as described above.
Japanese Patent Laid-Open No. 2002-19441 Japan Society for Invention and Innovation Technical Report 2000-6366

  Therefore, in the present invention, the main problem is to reduce the occurrence of abnormal noise between the upper support and the suspension tower. The feature of the strut is that the upper support of the strut is formed around the hole provided in the suspension tower. In the strut mounting structure that is attached to the suspension tower using a plurality of bolts, the hole of the suspension tower is formed in a regular polygonal shape, and the bolts are formed outside the center of each side of the hole. Bolt insertion holes are provided for inserting the bolts.

  In this case, bolt insertion holes are provided on the center outer sides of the respective side portions of the hole portions provided in the suspension tower, and non-contact portions that do not contact the upper surface of the upper support at the respective corner portions of the hole portions. It is possible to provide. Since the hole portion has a regular polygonal shape, each bolt insertion hole and each non-contact portion are provided at equal intervals in the circumferential direction of the hole portion. Accordingly, the contact area outside the hole except the vicinity of each bolt insertion hole is narrowed and the non-contact area is uniformly distributed in the circumferential direction of the hole, so that the surface pressure in the circumferential direction of the hole is uniform. become. As a result, it is possible to reduce the occurrence of abnormal noise due to contact and separation between the upper support and the suspension tower, and it is possible to reduce the generated abnormal noise.

  Further, when the upper support is attached to the suspension tower in the implementation of the present invention, the bolts and the bolt insertion holes are inscribed in a state in which they cannot rotate on the outer periphery with respect to the holes of the suspension tower. Can be provided so as to be detachable and integrally rotatable with respect to the upper support.

  In this case, when the upper support is attached to the suspension tower, each bolt and each bolt insertion hole can be arranged coaxially, in addition to the effect of reducing the occurrence of abnormal noise as described above. In addition, it is possible to improve the mountability of the upper support to the suspension tower. In particular, in this case, there are as many attachment positions as there are polygonal corners of the holes provided in the suspension tower, so the conventional non-circular holes (there is only one attachment position) Compared to the above, the attachment of the upper support to the suspension tower can be further improved.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a part of a suspension device to which a strut mounting structure according to the present invention is applied. In this suspension device, a strut 10 is attached to a suspension tower 20 (vehicle body) via an upper support 11 at its upper end. It is attached using three bolts 30, 30, 30. The strut 10 is connected to a knuckle or the like using a well-known means at its lower end (not shown).

  As shown in FIG. 2, the upper support 11 is interposed between the strut 10 and the suspension tower 20 and is assembled to the strut 10 so as to be rotatable around the vertical axis. The upper support 11 includes a base portion 12 and a central metal fitting portion 13.

  The base portion 12 is formed of a substantially equilateral triangular plate-shaped metal fitting, and includes a circular hole portion 12a (see FIG. 1) penetrating in the vertical direction at the center thereof, and each corner of the equilateral triangle. Nut portions 12b, 12c, and 12d that can be screwed onto the bolts 30, 30, and 30 are provided respectively.

  The central metal part 13 is formed of a cylindrical cap, and is assembled to the hole 12 a of the base part 12 in a state of protruding upward from the upper surface of the base part 12. Three cutout pieces 13a, 13b, 13c are cut and raised inward in the circumferential direction at equal intervals on the inner circumference of the central metal fitting 13. The center metal fitting 13 abuts on the inner peripheral surface of a jig 40 described later on the outer peripheral surface thereof, and is removably engaged with the jig 40 by the notched pieces 13a, 13b, 13c.

  The suspension tower 20 includes a regular triangular hole 20a. The hole 20a is formed by an inner peripheral surface of an inclined wall that makes the equilateral triangle smaller as it goes upward, and the corners C1, C2, C3 of the equilateral triangle have substantially the same arc. Is formed. Further, the hole 20a is formed to have such a size that a non-contact portion that hardly contacts the upper surface of the base portion 12 of the upper support 11 is formed at each of the corner portions C1, C2, and C3. The hole 20a guides the jig 40 toward a predetermined position when the jig 40 is inserted, and plays a role of avoiding interference with the suspension tower 20 of the central metal fitting 13 provided in the upper support 11.

  Bolt insertion holes 20b, 20c, and 20d through which the bolts 30, 30, and 30 are inserted are respectively formed on the center outer sides of the side portions L1, L2, and L3 in the hole portion 20a of the suspension tower 20. Each bolt insertion hole 20b, 20c, 20d is coaxially arranged with each nut part 12b, 12c, 12d provided in the base part 12 of the upper support 11, respectively.

  The bolts 30, 30, 30 are respectively inserted through the bolt insertion holes 20 b, 20 c, 20 d from the upper surface side of the suspension tower 20, and are respectively screwed into the nut portions 12 b, 12 c, 12 d in the base portion 12 of the upper support 11. Match.

  By the way, the upper support 11 of the strut 10 described above is attached to the suspension tower 20 through the following steps (first step to fourth step) using the jig 40. The jig 40 has a substantially cross-sectional shape (droplet shape), and the jig 40 cannot rotate to one of the corners C1, C2, C3 of the hole 20a on the outer periphery. It is designed to be inscribed in such a state. In addition, in FIG. 1, the jig | tool 40 has shown the state inscribed in the hole 20a in the corner part C1, as shown with a dashed-two dotted line.

  First, in the first step, the jig 40 is mounted on the upper support 11. In this state, the jig 40 engages with the notch pieces 13 a, 13 b, 13 c of the central metal part 13 and can rotate integrally with the upper support 11.

  Next, in the second step, the jig 40 is inserted into the hole 20 a of the suspension tower 20. In this case, the jig 40 is rotated around the vertical axis while being guided by the inner peripheral surface of the inclined wall of the hole 20a, and, for example, is in a state in which it cannot rotate with respect to the hole 20a at the corner C1. Inscribed in. Further, the upper support 11 rotates together with the jig 40. In the state where the second step is completed, the nut portions 12b, 12c, 12d in the base portion 12 of the upper support 11 and the bolt insertion holes 20b, 20c, 20d of the suspension tower 20 are coaxially arranged. Yes.

  Next, in the third step, the bolts 30, 30, 30 are respectively inserted into the bolt insertion holes 20 b, 20 c, 20 d of the suspension tower 20, and are respectively inserted into the nut portions 12 b, 12 c, 12 d of the upper support 11. Screwed together. Finally, in the fourth step, the jig 40 is removed from the upper support 11.

  In the strut mounting structure according to this embodiment configured as described above, the bolt insertion holes 20b, 20c, and 20d are provided outside the center of the side portions L1, L2, and L3 of the hole portion 20a provided in the suspension tower 20. A non-contact portion that is formed and is not in contact with the upper surface of the base portion 12 of the upper support 11 is formed at each corner portion C1, C2, C3 of the hole portion 20a. Since the hole 20a has an equilateral triangle shape, the bolt insertion holes 20b, 20c, 20d and the non-contact parts are all arranged at equal intervals in the circumferential direction of the hole 20a. Therefore, the area of the contact portion outside the hole 20a excluding the vicinity of each bolt insertion hole 20b, 20c, 20d is extremely narrow, and the area of the non-contact portion is uniformly distributed in the circumferential direction of the hole 20a. The surface pressure in the circumferential direction of the hole 20a becomes uniform. Thereby, it is possible to reduce the occurrence of abnormal noise itself due to the contact and separation between the base portion 12 of the upper support 11 and the suspension tower 20.

  Further, in this embodiment, when the upper support 11 is attached to the suspension tower 20, the bolts 30, 30, 30, the bolt insertion holes 20 b, 20 c, 20 d of the suspension tower 20, and the nut portions of the upper support 11 12b, 12c, and 12d can be arranged coaxially. For this reason, in addition to the effect of reducing the occurrence of abnormal noise as described above, it is possible to improve the mountability of the upper support 11 to the suspension tower 20. In particular, in this embodiment, since there are only three triangular mounting positions of the hole 20a provided in the suspension tower 20, that is, three attachment positions, a conventional non-circular (elliptical or drop-shaped) hole is provided. As compared with the one having the above (the one having only one attachment position), the attachment of the upper support 11 to the suspension tower 20 can be further improved.

  Further, in this embodiment, as described above, the bolt insertion holes 20b, 20c, 20d of the suspension tower 20 are arranged at equal intervals on the outer sides of the sides of the side portions L1, L2, L3 of the hole 20a. ing. Therefore, the force applied to the upper support 11 acts on each bolt 30, 30, and 30 equally, and the intensity | strength setting which reduced intensity | strength is possible.

  In this embodiment, the size of the hole 20a provided in the suspension tower 20 is larger than that of the conventional one. For this reason, the weight of the suspension tower 20 can be reduced.

  In the above-described embodiment, the present invention is applied to the strut mounting structure in which the upper support 11 is mounted to the suspension tower 20 using the three bolts 30, 30, 30. For example, four or more bolts are used. It is also possible to implement the present invention in a strut mounting structure that uses the upper support to mount the upper support to the suspension tower. In this case, a regular polygonal hole having the same number of corners as the number of bolts to be used is formed in the suspension tower, and each bolt is placed outside the center of each side of the hole in the same manner as in the above-described embodiment. Bolt insertion holes for inserting the bolts may be provided.

  In the above-described embodiment and its modified embodiments, a non-contact portion where the upper surface of the base portion of the upper support does not contact is formed at each corner portion of the regular polygonal hole provided in the suspension tower. Although the size of the hole is set in the hole, it is also possible to set the hole so as to reduce the area of the non-contact portion to be formed to the extent that the generated abnormal noise is reduced. .

  Further, in the above-described embodiment and its various modified embodiments, the present invention is implemented in the strut mounting structure in which each bolt is screwed to each nut portion provided on the upper support. A plurality of protruding stud bolts may be provided, and the stud bolts may be inserted into the bolt insertion holes provided in the suspension tower from below and screwed to the nut portions on the suspension tower side.

It is a top view which shows roughly the suspension apparatus to which the attachment structure of the strut by this invention is applied. It is a perspective view which shows the strut and suspension tower before applying the strut attachment structure by this invention with a jig | tool.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Strut, 11 ... Upper support, 12b, 12c, 12d ... Nut part, 20 ... Suspension tower, 20a ... Hole part, 20b, 20c, 20d ... Bolt insertion hole, 30, 30, 30 ... Bolt, 40 ... Jig

Claims (2)

In the strut mounting structure in which the upper support of the strut is attached to the suspension tower using a plurality of bolts around a hole provided in the suspension tower.
Strut mounting structure characterized in that the shape of the hole of the suspension tower is formed in a regular polygonal shape, and a bolt insertion hole for inserting the bolts is provided outside the center of each side of the hole. . The strut mounting structure according to claim 1,
When the upper support of the strut is attached to the suspension tower, the bolts and the bolt insertion holes are coaxially inscribed with the holes of the suspension tower in a non-rotatable state on the outer periphery. The strut mounting structure is characterized in that a jig disposed on the upper support is detachably attached to the upper support and is integrally rotatable.

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