JP2004276831A - Damper mounting structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a damper mounting structure whereby mounting rigidity of an upper part of a damper can be enhanced, and a damper arrangement space can be secured. <P>SOLUTION: An upper part of the damper 18 having a lower end connected to a lower arm 16 of a suspension device is housed inside a side frame 11 having a closed cross section, and an upper spring seat 31 which is a mounting part of the damper 18 is fixed on a lower surface of the side frame 11 by a bolt 40. Thus, support rigidity of the damper 18 is enhanced, and responsiveness of the damper 18 with respect to a load inputted from the lower arm 16 can be enhanced. Further, the upper part of the damper 18 is housed inside the side frame 11, and thereby an inside space of the side frame 11 can be used as the arrangement space of the damper 18. It is not necessary to arrange the side frame 11 and the damper 18 side by side along the vehicle lateral direction, and thereby it is easy to secure the arrangement space of the suspension device. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a damper mounting structure for mounting a damper for damping a vertical movement of a suspension arm or a knuckle of a suspension device to a vehicle body.
[0002]
[Prior art]
2. Description of the Related Art Japanese Unexamined Patent Application Publication Nos. H11-64131 and H11-64768 disclose a mounting structure of a damper that supports an upper portion of a damper of an automobile to a vehicle body.
[0003]
In those described in Patent Literatures 1 and 2, the upper portion of the damper is attached to the inner surface of a wheel house that is connected to the outside of the vehicle body frame in the left-right direction.
[0004]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 2000-186738 [Patent Document 2]
JP-A-10-273073
[Problems to be solved by the invention]
By the way, when the upper end of the damper is attached to the inner surface of the wheel house made of a thin plate, the load input from the damper causes the wheel house to bend and the responsiveness of the damper to deteriorate. Conventionally, in order to solve this problem, a reinforcing member is superimposed on a wheel house to reinforce it. However, there is a problem that the reinforcing member causes a weight increase. Further, since the damper and the body frame are juxtaposed in the lateral direction of the vehicle body, it is difficult to secure a space for disposing the damper while avoiding interference with the body frame.
[0006]
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a damper mounting structure capable of increasing the mounting rigidity of an upper portion of the damper and securing a space for disposing the damper.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention, an upper portion of a damper whose lower end is connected to a suspension device is housed in a body frame having a closed cross section, and a mounting portion of the damper is provided. There is proposed a damper mounting structure which is fixed to a lower surface of a body frame.
[0008]
According to the above configuration, since the mounting portion of the damper is fixed to the lower surface of the vehicle body frame having the closed cross section, the stiffness of the damper can be increased, and the responsiveness of the damper to a load input from the suspension device can be improved. Also, since the upper part of the damper is housed inside the vehicle body frame, the internal space of the vehicle body frame can be used as a space for arranging the damper, and there is no need to arrange the vehicle body frame and the damper side by side in the vehicle body, so the suspension device It is easy to secure a space for the arrangement.
[0009]
The side frame 11 of the embodiment corresponds to the vehicle body frame of the present invention, and the upper spring seat 31 of the embodiment corresponds to the mounting portion of the present invention.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described based on examples of the present invention shown in the accompanying drawings.
[0011]
1 to 4 show an embodiment of the present invention. FIG. 1 is a longitudinal sectional view of an automobile damper, FIG. 2 is a sectional view taken along line 2-2 of FIG. 1, and FIG. FIG. 4 is a sectional view taken along line 4-4 in FIG.
[0012]
As shown in FIGS. 1 and 2, the side frame 11 of the automobile is formed in a square cross section by welding a first member 21 having an L-shaped cross section and second and third members 22 and 23 having a flat cross section. The upper and lower ends of the cylindrical bulkhead 24 are welded between the lower surface of the first member 21 and the upper surface of the third member 23 which are vertically opposed. A circular opening 21a is formed in the first member 21 and a circular opening 23a (see FIG. 2) is formed in the third member 23 so as to communicate with the inside of the bulkhead 24. Two bolt holes 23b, 23b and two locking holes 23c, 23c are formed so as to surround the circumference of the circular opening 23a of the third member 23, and these bolt holes 23b, 23b are formed in these bolt holes 23b, 23b. Correspondingly, two weld nuts 25 are provided on the upper surface of the third member 23.
[0013]
The damper 18 includes a cylinder 26 filled with oil therein, and a piston rod 27 protruding and retracting from the upper end of the cylinder 26. The lower end of the cylinder 26 is provided between the lower arm 16 and a rubber bush joint 28 and a bolt 29. Supported by the department.
[0014]
A cup-shaped piston rod holder 30, a dish-shaped upper spring seat 31, and a cylindrical cylinder cover 32 are integrally provided, and a piston rod 27 is elastically supported on the upper surface of the piston rod holder 30. That is, the piston rod 27 penetrates a pair of upper and lower rubber bushes 33 and 34 sandwiching the upper surface of the piston rod holder 30, and includes a washer 35 fixed to the piston rod 27 and a washer 37 fixed to the piston rod 27 with a nut 36. Rubber bushes 33 and 34 are sandwiched between them.
[0015]
A dish-shaped lower spring seat 38 is fixed to a lower portion of the cylinder 26, and upper and lower ends of a coil spring 39 arranged to surround the periphery of the cylinder 26 are supported by the upper spring seat 31 and the lower spring seat 38, respectively. You. At this time, a rubber insulator 41 is arranged between the lower surface of the upper spring seat 31 and the upper end of the coil spring 39. The upper spring seat 31 is provided with two locking projections 31a, 31a formed in a hook shape by cutting and raising, and two bolt holes 31b, 31b.
[0016]
The damper 18 previously assembled as an assembly is attached to the vehicle body as follows. That is, the piston rod holder 30 on the upper part of the damper 18 is inserted into the opening 23a of the third member 23 of the side frame 11 from below, and the two locking members formed on the upper spring seat 31 fixed to the lower part of the piston rod holder 30 After the projections 31a, 31a are inserted into the locking holes 23c, 23c of the third member 23 (see FIGS. 3 and 4), the damper 18 is rotated around its axis to make the locking projections 31a, 31a into the locking holes 23c. , 23c to temporarily fix the damper 18 to the side frame 11. As described above, since the temporary fixing is completed only by rotating the damper 18, the operation is extremely easy. When the damper 18 is temporarily fixed to the side frame 11, the two bolt holes 31b of the upper spring seat 31 match the two bolt holes 23b of the first member 23 (see FIG. 1).
[0017]
Therefore, in this temporarily fixed state, the two bolts 40, 40 are inserted into the two bolt holes 31b, 31b of the upper spring seat 31 and the two bolt holes 23b, 23b of the third member 23 from below, and By fastening to the two weld nuts 25 on the upper surface of the member 23, the upper part of the damper 18 can be attached to the side frame 11. At this time, the upper end of the damper 18 protrudes upward from the opening 21a of the first member 21 of the side frame 11.
[0018]
As described above, the upper part of the damper 18 is inserted into the openings 23a, 21a of the side frame 11 from below, and the bolts 40, 40 are inserted and tightened from below, which is the same direction as the insertion direction of the damper 18, so that the conventional method is used. The workability is greatly improved as compared with the case where a nut is fastened from above to a stud bolt provided on the damper and the upper part of the damper is attached to the vehicle body. In other words, it is not necessary for one worker to insert the damper from below the vehicle body and for another worker to fasten the nut from above the vehicle body, and one worker can attach the damper 18.
[0019]
In addition, in the temporarily fixed state in which the locking projections 31a are engaged with the locking holes 23c, the damper 18 does not drop even if the hand is released, so that the work of fastening the bolts 40, 40 becomes even easier. After that, when the lower end of the damper 18 is connected to the lower arm 16 with the bolt 29, the damper 18 cannot rotate around its axis. Therefore, even if the two bolts 40, 40 are loosened and come off, the upper part of the damper 18 will remain. It does not fall off the side frame 11. In particular, since the upper portion of the damper 18 is fitted into the inside of the side frame 11, the drop of the damper 18 from the side frame 11 is more reliably prevented.
[0020]
Further, since the upper portion of the damper 18 is fixed to the lower surface of the highly rigid side frame 11 due to having a closed cross section, the stiffness of the support of the damper 18 is increased so that the responsiveness of the damper 18 to the load input from the lower arm 16 is improved. Can be enhanced. Further, since the upper portion of the damper 18 is housed inside the side frame 11, the space inside the side frame 11 can be used for arranging the damper 18, thereby improving the space efficiency. Since it is not necessary to arrange the suspension devices in the left-right direction of the vehicle body, it is easy to secure a space for disposing the suspension device.
[0021]
Although the embodiments of the present invention have been described in detail, various design changes can be made in the present invention without departing from the gist thereof.
[0022]
For example, in the embodiment, the rear wheel damper 18 has been described, but the present invention can be applied to a front wheel damper.
[0023]
In the embodiment, the lower end of the damper 18 is connected to the lower arm 16, but it may be connected to a knuckle.
[0024]
【The invention's effect】
As described above, according to the first aspect of the present invention, since the mounting portion of the damper is fixed to the lower surface of the vehicle body frame having a closed cross section, the support rigidity of the damper is increased, and the damper for the load input from the suspension device is increased. Responsiveness can be improved. In addition, since the upper part of the damper is housed inside the body frame, the internal space of the body frame can be used as a space for arranging the damper, and there is no need to arrange the body frame and the damper side by side in the vehicle body. It is easy to secure a space for the arrangement.
[Brief description of the drawings]
1 is a longitudinal sectional view of an automobile damper; FIG. 2 is a sectional view taken along a line 2-2 in FIG. 1; FIG. 3 is an explanatory view of an operation when the damper is assembled; FIG. 4 is a sectional view taken along a line 4-4 in FIG. [Explanation of symbols]
11 Side frame (body frame)
18 Damper 31 Upper spring seat (mounting part)

Claims (1)

The upper part of the damper (18), the lower end of which is connected to the suspension device, is housed inside the body frame (11) having a closed cross section, and the mounting part (31) of the damper (18) is mounted on the lower surface of the body frame (11). A damper mounting structure that is fixed.

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