JPH08188024A - Suspension fixing structure - Google Patents

Abstract

PURPOSE: To prevent looseness of bolts from nuts to be used in fixing, concerning a suspension fixing structure suitable for a structure for fixing a vehicular suspension to a body. CONSTITUTION: An upper support 22 for fixing a piston rod 10 of a shock absorber to a body side member 20 is constituted of rotary bearings 16 for gripping the piston rod 10, an elastic body 28, and first and second supporting members 30, 32. Fixing of the piston rod 10 is performed by using bolts 34 and nuts 36 in a state where the body side member 20 is pinched by the first and second supporting members 30, 32.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a suspension fixing structure, and more particularly to a suspension fixing structure suitable as a structure for fixing a vehicle suspension to a vehicle body.

[0002]

2. Description of the Related Art Conventionally, for example, Japanese Utility Model Laid-Open No. 55-9860.
As disclosed in Japanese Patent Publication No. 5, as a structure for fixing the vehicle suspension to the vehicle body,
A structure is known in which an upper support having an elastic body is provided inside, and the upper support is incorporated from below the vehicle body and fixed to the vehicle body by bolts.

That is, in the structure for fixing the vehicle and the suspension, it is possible to appropriately suppress the transmission of the vibration input from the wheels to the suspension to the vehicle body, and the load input to the suspension, particularly the thrusting direction. It is required that the rigidity that can withstand the load be secured.

On the other hand, in the structure disclosed in the above publication, by disposing the elastic body in the upper support,
That is, a structure for ensuring vibration absorbing function by interposing an elastic body between the suspension and the vehicle body, and assuring rigidity against a load in the thrust direction by assembling the upper support by abutting from below the vehicle body. Is.

[0005]

By the way, the above-mentioned conventional suspension fixing structure adopts a structure in which the upper support and the vehicle body are fixed by bolting. However, the torque for fixing the bolt and the nut is It is exhibited when an appropriate tension acts on the nut.

On the other hand, in the above-mentioned conventional structure, when a load in the push-up direction is input to the suspension, the load is generated in the direction of pressing the upper support toward the vehicle body, that is, between the bolt and the nut. It acts in the direction of weakening the applied tension, and the fixing torque between the bolt and the nut is weakened.

That is, the above-mentioned conventional suspension fixing structure is effective in that it can ensure the vibration absorbing function and rigidity required for such a structure, but the bolts for fixing the upper support and the vehicle body may be loosened. It had the drawback of being.

The present invention has been made in view of the above points, and a bolt used for fixing is applied by constantly applying a load input from the suspension in a direction of increasing the tension generated between the bolt and the nut. It is an object of the present invention to provide a suspension fixing structure in which there is no possibility of loosening.

[0009]

SUMMARY OF THE INVENTION The above object is to provide a suspension fixing structure for fixing a suspension member to a member on the vehicle body side by means of first and second support members that receive a load input from the suspension member. Is fixed in the load input direction, and the first and second support members and the vehicle body side member are fixed with a screw member.

[0010]

In the suspension fixing structure according to the present invention, the load input to the suspension member is transmitted to the vehicle body side member via the first and second support members.

At this time, since the vehicle-body-side member is sandwiched between the first and second support members, when a load is applied to the suspension member, the load is a thrust-direction load. Even when the load is in the opposite direction, one of the first and second support members is pressed by the vehicle body side member and the other is separated from the vehicle body side member.

Therefore, when a load is applied to the suspension member, the tension acting on the screw member for fixing the first and second support members and the vehicle-body-side member is not weakened. As a result, the possibility that the screw member will loosen is wiped out.

[0013]

FIG. 1 is a front sectional view of essential parts of a suspension member and a vehicle body side member fixed by using a suspension fixing structure according to an embodiment of the present invention. In the figure, a piston rod 10 is a piston rod of a shock absorber corresponding to the above-mentioned suspension member. As shown in the figure, an upper spring seat 14 that supports the upper end of the coil spring 12 is fixed to the piston rod 10.

Above the upper spring seat 14,
An inner race 16a of a rotary bearing 16 that rotatably grips the piston rod 10 is provided via the seat 15. The inner race 16a is fixed to the piston rod 10 by a nut 18 screwed to the upper end of the piston rod 10.

The rotary bearing 16 is a part of the upper support 22 for fixing the piston rod 10 to the vehicle body side member 20, and the outer race 16b has an upper support inner cylinder 24 and an upper support inner cylinder fitting. Two
6 is fixed. Furthermore, the upper support inner cylinder 2
4, and an elastic member 28 having appropriate elasticity is arranged around the upper support inner cylindrical metal fitting 26, and a first support member 30 is bonded to a lower end surface of the elastic member 28.

Here, the first support member 30 is a member that comes into contact with the vehicle body side member 20 from below, and the upper support 22 is provided in the bolt holes provided in the first support member 30 and the vehicle body side member 20. So that it overlaps with the bolt holes
The vehicle body side member 20 is assembled from below.

The upper support 22 is made of the elastic body 2.
The second support member 32 is attached to the upper end surface of the vehicle body 8 and the upper surface of the vehicle body-side member 20 so as to be in contact therewith. Here, the second support member 32 includes the first support member 30 described above.
Similarly to the above, a bolt hole that can overlap with the bolt hole of the vehicle body side member 20 is provided, and the assembly of the second support member 32 is
It is done so that they overlap.

The above-mentioned first support member 30, second support member 32, and vehicle body-side member 20 are fixed by bolts 34 penetrating through bolt holes provided therein and nuts 36 screwed onto the bolts 34. It In this case, when the upper support 22 is fixed to the vehicle body-side member 20, the vehicle body-side member 20 includes the first support member 30 and the second support member 32.
It will be sandwiched between and. Incidentally, in this embodiment, the bolt 34 and the nut 36 constitute the above-mentioned screw member.

By the way, the upper support 2 having the above structure
When the piston rod 10 and the upper spring seat 14 are fixed to the vehicle body-side member 20 by using 2, the load in the push-up direction or the pull-out direction input to the piston rod 10 and the coil spring 12 is entirely in the rotary bearing 16. It is transmitted to the elastic body 28 via the elastic body 28, and further transmitted to the vehicle body side member 20 via the first and second support members 30 and 32.

At this time, if the load input to the piston rod 10 and the spring coil 12 is an upward load, the elastic body 22 is deformed between the first support member 30 and the upper support inner tubular metal fitting 26. A tensile force is generated due to. As a result, the first support member 30 has a load in the direction of increasing the pressing force between the vehicle body side member 20 and the first support member 30, that is, the tension acting between the bolt 34 and the nut 36. Will be transmitted in the direction of decreasing

On the other hand, in the same situation, a compressive force is generated between the second support member 32 and the upper support inner cylinder fitting 26 due to the deformation of the elastic body 22, and as a result, the second support member is formed. A load in the direction of increasing the tension acting between the bolt 34 and the nut 36 is transmitted to the member 32.

In this case, when the compressive force and the tensile force generated due to the deformation of the elastic body 22 are compared, the compressive force is larger than the tensile force. The load transmitted to the second support member 32 acts as a load that increases the tension acting between the bolt 34 and the nut 36, while the load transmitted to the first support member 30 is the load on the vehicle body side member 20.
Due to the rigidity of the bolt 34 and nut 36
It does not act as a load that reduces the tension that acts between and.

Therefore, as described above, the piston rod 1
0, and when a load in the push-up direction is input to the coil spring 12, overall, the bolt 34 and the nut 36 are
The tension acting between and will increase. When the force input to the piston rod 10 and the coil spring 12 is in the pulling direction, the first support member 3
0, a load in the direction of increasing the tension acting between the bolt 34 and the nut 36, and a load in the direction of decreasing the tension acting between the bolt 34 and the nut 36 on the second support member 32. Although transmitted to each of them, the tension acting between the bolt 34 and the nut 36 is eventually increased for the same reason.

On the other hand, after the bolts 34 and the nuts 36 are tightened, in order to keep them firmly fixed, appropriate tension must be generated between the bolts 34 and the nuts 36. As described above, when the tension is loosened, the fixing torque for fixing the two is reduced, and the bolt 34 and the nut 36 may loosen.

Therefore, as long as tightening with a sufficient torque at the time of assembly, the tension acting between the bolt 34 and the nut 36 will not decrease even if the traveling vibration is input as the vehicle travels thereafter. According to the structure of this embodiment,
The possibility of loosening between the bolt 34 and the nut 36 can be eliminated.

In this sense, the suspension fixing structure of this embodiment has a higher durability than the conventional structure for fixing the suspension with the upper support only in contact with the lower surface of the vehicle body side member. And, it has an advantage that reliability can be secured.

By the way, FIG. 2 shows an assembly diagram for realizing the suspension fixing structure of this embodiment. That is, in the figure, as described above, the first support member 30 is assembled from below the vehicle body side member 20, and the second support member 32 is assembled from above the vehicle body side member 20, respectively, and the bolt 34 and the nut 3 are assembled.
6 shows a structure in which 6 is screwed.

On the other hand, FIG. 3 shows an assembly diagram for realizing the above-mentioned conventional suspension fixing structure. In this case, in the drawing, the upper support 42 is assembled from below the vehicle side member 40, and the reinforcing plate 44 for reinforcing the vehicle side member 40 from above the vehicle side member 40.
Are assembled and fixed with bolts 46 and nuts 48.

Here, the reinforcing plate 44 is used in the structure shown in FIG. 3 in such a structure that the load in the pulling direction applied to the upper support 42 is entirely taken up only by the seat surface of the nut 48. Therefore, the required strength cannot be secured only by increasing the plate thickness of the vehicle body side member 40.

For the same reason, when the structure shown in FIG. 3 is used, it is necessary to secure a relatively large pitch of the bolt holes, which makes it difficult to reduce the space required for fixing the suspension. Further, the vehicle body side member 40
There is also the disadvantage that it is necessary to provide an annular protrusion 40a for reinforcement.

On the other hand, according to the suspension fixing structure of this embodiment, if the second supporting member 32 is provided with sufficient strength, not only the reinforcing plate 44, the annular projection 40, etc. are unnecessary but also the vehicle body side. The member 20 can be made thin, and the fixing space can be made smaller by further reducing the pitch of the bolt holes.

In this sense, the suspension fixing structure of this embodiment has the advantages that it can realize the weight reduction of the vehicle, the space saving for mounting the suspension, and the cost reduction due to the simplification of the structure. become. FIG.
FIG. 6 is a front sectional view of a main part of a suspension member and a vehicle body side member fixed by using a suspension fixing structure according to a second embodiment of the present invention. In the figure, the same components as those in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted.

That is, the suspension fixing structure shown in FIG. 4 is characterized in that the upper support 50 is provided with the plate 54 on the upper end surface of the elastic body 52. That is, in the suspension fixing structure shown in FIG. 1, since the elastic body 28 and the second support member 32 are separate components, and both are merely in pressure contact, when vibration is input to the piston rod 12. In this case, the two relatively move, and the upper end surface of the elastic body 28 and the lower surface of the second support member 32 may slide. At this time, if the elastic body 28 and the second support member 32 are in direct contact with each other, the elastic body 28 may be worn and noise may be generated due to the sliding of the two.

Therefore, in the structure shown in FIG. 4, a plate 54 is adhered to the upper end surface of the elastic body 52 in order to eliminate the adverse effects caused by such sliding. In this case, the plate 54 and the second support member 32 are held by the frictional force generated between them by the pressing force of the elastic body, and the elastic body 52 and the plate 54 are adhered to each other, so that sliding is possible. Does not occur. Therefore, problems such as wear of the elastic body 52 and abnormal noise can be reliably solved.

Further, the upper support inner cylinder fitting 26 in this embodiment is different from the first embodiment in that the piston rod 10 is different from the first embodiment.
The shape is curved to the side, and the stress applied to the elastic body 52 from the upper support inner cylinder fitting 26 is prevented from concentrating, and the durability of the elastic body 52 is improved.

FIG. 5 is a front sectional view of the main parts of the suspension member and the vehicle body side member fixed by using the suspension fixing structure according to the third embodiment of the present invention. In the figure, the same components as those in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted. The upper support 60 shown in FIG.
The rotary bearing 62 is provided in contact with the upper surface of the upper spring seat 14. The rotary bearing 62 is in contact with the lower surface of the first support member 30. Therefore, in the structure of the present embodiment, the load input to the coil spring 12 does not pass through the elastic body 28, but the vehicle body side member 20.
Will be transmitted to.

However, the load applied to the piston rod 10 is the same as in the structure shown in FIGS. 4 and 5 above.
It is transmitted to the first and second support members 30 and 32 via the upper support inner cylinder fitting 26 and the elastic body 28. Therefore, the load input to the suspension eventually acts in the direction of increasing the tension acting between the bolt 34 and the nut 36, and the same effect as the structure shown in FIGS. 1 and 4 is obtained. Will be obtained.

That is, in the suspension fixing structure shown in FIGS. 1 and 4, the load input to the piston rod 10 and the load input to the coil spring 12 are both input to the inner race 16a of the rotary bearing 16. Then, the structure is such that it is transmitted to the vehicle body side member 20 via the elastic bodies 28 and 52, but the scope of application of the present invention is not limited to this, and as shown in FIG. The present invention can be applied to the case where the load and the load input from the shock absorber are separately transmitted.

[0039]

As described above, according to the present invention, when a force is applied to the portion for fixing the suspension member and the vehicle body side member in the thrust direction or the opposite direction, the suspension member and the vehicle body side member. It is possible to appropriately prevent the tension acting on the screw member for fixing and from being weakened.

Therefore, according to the suspension fixing structure of the present invention, it is possible to realize a fixing portion in which the screw member does not loosen when vibration is repeatedly input to the suspension member.

[Brief description of drawings]

FIG. 1 is a front sectional view showing a suspension fixing structure according to a first embodiment of the present invention.

FIG. 2 is an assembly diagram of a suspension fixing structure of this embodiment.

FIG. 3 is an assembly diagram of a conventional suspension fixing structure.

FIG. 4 is a front sectional view showing a suspension fixing structure which is a second embodiment of the present invention.

FIG. 5 is a front sectional view showing a suspension fixing structure which is a third embodiment of the present invention.

[Explanation of symbols]

 10 piston rod 12 coil spring 16 rotary bearing 20 vehicle body side fixing member 22, 50, 60 upper support 28, 52 elastic body 30 first support member 32 second support member 34 bolt 36 nut 54 plate

Claims (1)

[Claims] 1. A suspension fixing structure for fixing a suspension member to a vehicle body-side member, wherein the vehicle body-side member is sandwiched in the load input direction by first and second support members receiving a load input from the suspension member, Also, a suspension fixing structure characterized in that the first and second support members and the vehicle body side member are fixed by a screw member.