JPH0516002Y2 - - Google Patents

Description

[Detailed description of the invention] "Field of industrial application" The present invention relates to a front suspension support structure in which a suspension arm is supported on the vehicle body side via a subframe. Regarding the support structure for.

[Conventional technology]

In automobiles that include a subframe in the front body, a suspension arm of a front suspension and an engine are generally supported by the subframe.

As shown in FIG. 4, the subframe 12 that supports the A-type and L-type suspension arms 10 is fastened to the vehicle body side member by screw means 14, 16, 18 at multiple positions along the longitudinal direction of the vehicle body. It is supported by 20 people.

Incidentally, since the engine 24 is mounted and supported on the subframe 12 by engine mounts 22 disposed on the left and right sides of the subframe, vibrations of the engine 24 are transmitted. Therefore, if the sub-frame 12 is directly supported on the vehicle body member 20 by screw means, engine vibrations will be directly transmitted to the vehicle body member 20, causing problems in terms of riding comfort. For this reason, the subframe 12 is generally supported by the vehicle body side member 20 by a vibration-proof support structure.

[The problem that the idea attempts to solve]

However, in the anti-vibration support structure, since an elastic body is used as the anti-vibration means, the joint rigidity between the sub-frame 12 and the vehicle body member 20 is relatively low. Therefore, as shown in FIG. 4, when a force F is applied from the road surface to the wheels 26 during cornering, the subframe 12 and suspension arm 10 act as one body to rotate as shown by the wavy line. show. This rotation causes the suspension arm 10
This caused the problem that the desired steering stability could not be obtained because the wheel would move relative to the vehicle body.

In consideration of the above-mentioned facts, the present invention aims to provide a front suspension support structure in which the subframe can be used as a vibration-proof support structure without impairing steering stability.

[Means to solve the problem]

In the front suspension support structure according to the present invention according to claim 1, one side 2 along the longitudinal direction of the vehicle body
In a front suspension support structure in which an A-type or L-type suspension arm is supported by a subframe that is supported on the vehicle body at one or three points and has an engine mounted on engine mounts located at both ends in the vehicle width direction. The subframe is characterized in that the sub-frame has a support structure by direct bolt fastening at an end position along the longitudinal direction of the vehicle body, and a vibration-proof support structure at other positions and is supported toward the vehicle body side.

[Effect]

In the front suspension support structure configured as claimed in claim 1, the subframe is supported by direct bolt fastening on the end side along the longitudinal direction of the vehicle body away from the joining position of the chassis arm where the upper and lower components of the load of the suspension arm are received. Centering on the structure, the other end side can swing in the vertical direction of the vehicle body via the anti-vibration support structure, and engine vibrations are transmitted to the vehicle body via the anti-vibration support structure.

In addition, the subframe has a support structure that is directly connected with bolts at the end position along the longitudinal direction of the vehicle body, and is rigidly supported at two positions on the left and right, so external forces from the lateral direction of the vehicle body can be applied via the suspension arm. Even if this happens, the subframe is less likely to move compared to when everything is supported elastically, and there is no loss of steering stability.

〔Example〕

1 to 3 show an embodiment of a front suspension support structure according to the present invention applied to an automobile. As shown in FIG. 2, the subframe 12 has a substantially H-shaped planar shape,
Brackets 2 are attached to the legs 12A and 12A, respectively.
8,30 are fixedly installed. Further, engine mounts 22, 22 are fixedly installed in the vicinity of each leg in the connecting portion 12B that connects the legs 12A.

The brackets 28 and 30 have both ends 1 on the fork side of the L-shaped arm 10, which is a suspension arm.
0A and 10B are swingably supported by bolts and nuts 32 and 34 (see FIG. 1) via bushes (not shown). engine mount 2
An engine 24 is mounted and supported on 2 and 22 via anti-vibration rubber 36 (see FIG. 3).

The subframe 12 is arranged such that the bracket 28 is located on the front side of the vehicle body, the bracket 30 is located on the rear side of the vehicle body, and the leg portions 10A, 10A are located on the vehicle body side member 2.
It is supported by 0.20. The subframe 12 is supported on the vehicle body side member 20 by means of bolts and nuts 14, with each leg 12A located at the front side of the bracket 28, at the intermediate portion between the bracket 28 and the bracket 30, and at the rear side of the bracket 30. ，
16 and 18 are fastened to the vehicle body side member 20. The support by the bolts and nuts 14 and 16 is made into a vibration-proof support structure with vibration-proof rubbers 38 and 38 interposed therebetween. Further, at the position of the rear end of the suspension arm 10 along the longitudinal direction of the vehicle body, the support by the bolts and nuts 18 is not via vibration isolating rubber, but is a support structure using direct bolt fastening rigidity.

As shown in FIG. 1, the vibration isolating rubber 38 is bonded to the inner wall of an outer cylinder 40 that is locked to the subframe 12, and to the outer wall of the inner cylinder 42 through which the bolt 14 (or bolt 16) is inserted. . subframe 12
is movable in the direction of arrow A relative to the vehicle body side member 20 by elastically deforming the vibration isolating rubber 38.

Also, as shown in FIG. 1, subframe 1
The rear end portion of 2 is located at the rising portion of the vehicle body side member 20, and is supported by the vehicle body side member 20 at this portion by the bolt/nut position 8 as described above. The subframe 12 has a structure in which the vehicle body side member 20 and the subframe 12 are slightly elastically deformed at the support portion by bolts and nuts 18, so that the other end side can swing relatively largely in the direction of arrow A around the support portion. ing.

The free end 10C of the L-shaped arm 10 is supported by a strut 44 via a ball joint, knuckle, etc. (not shown), as shown in FIG. The upper part of the strut 44 is supported by a spring support 46 on the vehicle body side. Wheels 26 are attached to the knuckle side (not shown).
In addition, in FIG. 2, the reference numeral 48 is a dash panel.

Next, the operation of this embodiment will be explained.

When the engine 24 is started, a relatively large vibration is generated in the vertical direction of the vehicle body, which is the direction in which the piston moves, and this vibration is transmitted to the subframe 12 via the vibration isolating rubber 36 and the engine mount 22.
Due to this vibration, the other end of the sub-frame 12 is oscillated in the direction of arrow A in FIG. 1, centering around the support part that is directly bolted together by the bolt/nut 18. Since this vibration is transmitted to the vehicle body side member 20 via the vibration isolating rubber 38, the vibration is absorbed by the vibration isolating rubber 38, and the vibration on the vehicle body side is significantly reduced. Anti-vibration rubber 3 prevents vibrations in directions other than the vertical direction of the vehicle body.
Absorbed by 8.

In addition, the support part for direct bolt fastening using the bolt and nut 18 is located away from the engine mount 22, which is the vibration input part, and furthermore, a vibration-proof support structure part (support part by the bolt and nut 16) is located between the support part and the engine mount 22, so that the vibration transmitted to the support part is extremely small.

When a lateral force F is applied to the wheel 26 while the vehicle is running, this force is transferred from the L-shaped arm 10 to the subframe 1 via the nutcle, ball joint, etc.
It acts on 2. The left and right rear ends of the subframe 12 are rigidly supported by the vehicle body side members 20, 20 by bolts and nuts 18, and since the subframe 12 is supported in this way at two positions, the above-mentioned force acts. However, it will not rotate relative to the vehicle body. In addition, since the subframe itself has high rigidity, it does not substantially undergo elastic deformation, and the L-shaped arm 10
is held at the desired support position relative to the vehicle body.

As described above, in this embodiment, the subframe 12 has a support structure in which the rear end part is directly bolted together and a vibration-proof support structure in the middle part and the front part. is movable in the vertical direction, and vibrations from the engine, etc. are absorbed by the anti-vibration support structure, and the subframe is less likely to move than when everything is supported elastically, making it easier to find the desired support position. Retained. Therefore, it is possible to achieve a high level of both steering stability and good riding comfort.

In particular, in this embodiment, as shown in FIG.
Since the subframe 12 is located in the middle of the support structure (the support part), the vibration-proofing effect is further enhanced, and there are extremely few problems caused by the support structure in which the rear end of the subframe 12 is directly bolted with the bolts and nuts 18.

Furthermore, in this embodiment, due to the layout of the suspension, the end 10B of the front arm of the L-shaped arm 10, which receives most of the reaction force of the suspension spring, is located in the middle of the vibration-proof support structure, as described above. Therefore, vibrations from the road surface are effectively absorbed by the anti-vibration support structure.

In the above embodiment, the suspension arm 10 is L-shaped, but instead of this, the suspension arm 10 may be A-shaped. In addition, in the above embodiment, the rear end of the subframe 12, which is least affected by vibration, is provided with a support structure by direct bolt connection, but depending on the layout of the suspension, the shape of the subframe, etc. If the front end is the part least affected by vibration, the front end of the subframe may be directly connected to a support structure by bolts.

In addition, in the above embodiment, three-point support is provided with vibration-proof support structure at two positions along the longitudinal direction of the vehicle body, the front part and the middle part, but it is also possible to use two-point support without supporting the middle part. .

[Effect of idea]

As explained above, since the front suspension support structure according to the present invention has the above structure, it has the effect that the subframe can be made into a vibration-proof support structure without impairing steering stability.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing an embodiment of the front suspension support structure according to the present invention.
FIG. 2 is a plan view, FIG. 3 is a front view, and FIG. 4 is a plan view showing a conventional front suspension support structure. 10... L-shaped arm, 12... Subframe,
14, 16, 18...Boruto Natsuto, 20...
Vehicle body side member, 38... Anti-vibration rubber.

Claims (1)

[Scope of utility model registration request] An A-type or L-type suspension arm is supported by a subframe that is supported on the vehicle body at two or three points on one side along the longitudinal direction of the vehicle, and on which the engine is mounted on engine mounts located at both ends in the vehicle width direction. In the front suspension support structure, the sub-frame has a support structure by direct bolt fastening at an end position along the longitudinal direction of the vehicle body, and a vibration-proof support structure at other positions and is supported toward the vehicle body side. The front suspension support structure is characterized by: