JP3465614B2 - Body mount structure - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a body mount structure for supporting a subframe with respect to a body in a vibration-proof manner.

[0002]

2. Description of the Related Art Conventionally, a subframe is set independently of a vehicle body, and a vibration source and a noise source such as a drive system element and a suspension system element are attached to the subframe, and the subframe is mounted on a body. There is known a technique in which a soft ride and a quiet passenger compartment are obtained by mounting it on a vehicle body via. A widely known method for improving the performance of body mounts used in this type of technology is to change the spring constant in the displacement direction by inserting a currant into the elastic body of the body mount. ing.

[0003]

However, in the case of the above-mentioned conventional method, although the spring constant of the portion can be lowered by inserting the currant, the effect can be obtained by the body and the load. The relative displacement that occurs between the sub-frames is limited to a displacement (stroke) that does not collapse the currant. In other words, since the linear region is narrow in the method of inserting the currant into the elastic body of the body mount, when a relatively large load is input and the stopper is hit, the spring constant rises sharply and the vibration at that time It is disadvantageous in that it is transmitted to the body side and relatively loud noise is generated.

In view of the above background, it is an object of the present invention to obtain a body mount structure capable of effectively suppressing vibration and noise generated when the vehicle is running by expanding the linear region.

[0005]

The present invention according to claim 1 is provided with left and right integrated sub-frame side rails.
The inner frame fixed to the body and the sub-frame
Between the outer cylinder to which the subframe is fixed and the inner and outer cylinders, and the surrounding
And an elastic body interposed between
The front side button located at the front end of the ram side rail
After the D mount and the subframe side rail
The rear body mount located at the end of the
It has a body mount structure that supports vibration isolation on the dee side.
The front body mount and rear body
-The body mount of the sub-frame in the mount
The front side clip formed between the front end of the
Rear lance and body mount insertion of the subframe
Rear clearer formed between the rear end of the entrance side and the inner cylinder
It is characterized by different from each other .

[0006] Body mounting structure according to the present invention described in claim 2 is the invention according to claim 1, wherein the flow
For front side body mount and rear side body mount
The upper end of the sub-frame and the upper body
And the upper clearance formed between
The bottom formed between the lower end of the ram and the lower body
The feature is that it is different from the side clearance .

[0007]

According to the present invention of claim 1, the subframe is
The arm is equipped with left and right integrated subframe side rails.
Become. Then, the inner cylinder and the sub frame, which are respectively fixed to the body,
Intervene between the outer cylinder to which the ram is fixed and the inner and outer cylinders, and around it
And the sub-frame side
Front body mount located at the front end of the rail
And the rear end of the subframe side rail
Via the rear body mount, the subframe
The vibration is supported by the body on the side of the body.

By the way, loads in various directions are input to the sub-frame while the vehicle is traveling. Taking a rear-drive vehicle as an example, when starting and accelerating, the upward and backward falling moments are input to the subframe because the differential carrier winds up. At the same time, the translational force to the front side of the vehicle is input to the subframe via the suspension arm. On the other hand, braking / deceleration /
When riding over a protrusion, a load that is in the opposite relationship is input. That is, a forward downward and upward rearward moment is input to the subframe, and a translational force to the vehicle rear side is input. These moments and translational forces are
Both are relatively large input loads.

Here, in the present invention, the front body
Mount and rear body mount
Between the front end of the ram body mount insertion side and the inner cylinder
Front side clearance and the sub-frame
It is formed between the rear end of the D mount and the inner cylinder.
Since the rear clearance is different from each other, a larger deformation stroke of the elastic body is secured in the direction in which the subframe is relatively displaced, and thus the linear region in the direction in which the subframe is relatively displaced. Is expanded. For example, from the character of the vehicle, the linear area on the acceleration side (driving side)
Clear rear clearance if you want to enlarge
It should be larger than the lance, and conversely due to the character of the vehicle
If you want to expand the linear area on the deceleration side (braking side), on the contrary,
Make the side clearance larger than the rear clearance.
Just do it. As a result, even when a relatively large load as described above is input, it is possible to avoid the sudden rise of the spring constant.

[0011]

According to the second aspect of the present invention, the front
Side body mount and rear body mount
That the upper side clearance formed between the upper portion and the upper side body of the sub-frame, so made different from each other and a lower side clearance formed between the lower end and the lower side body of the sub-frame If the body mount is set to two points in the front and rear, and if you want to expand the linear area on the acceleration side (driving side) due to the nature of the vehicle, for the front body mount, the upper clearance should be greater than the lower clearance. Also, the size of the body mount on the rear side can be reversed, and vice versa. Also, if you want to expand the deceleration side (braking side) linear area due to the nature of the vehicle, make the lower clearance larger than the upper clearance for the front body mount and vice versa for the rear body mount. You can do this.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a body mount structure according to the present invention will be described below with reference to FIGS. In these figures, the arrow FR, which is shown appropriately, indicates the vehicle front side, the arrow UP indicates the vehicle upper side, and the arrow IN indicates the vehicle interior side.

FIG. 5 is an overall perspective view of a suspension system and a drive system on the rear side in a rear drive vehicle, and FIG. 4 is a rear subframe side rail and a rear subframe cross which constitute a rear subframe. An overall plan view of the member is shown, and further, an enlarged plan view of the rear subframe side rail is shown in FIG. As shown in these figures (mainly FIG. 5), the pair of rear sub-frame cross members 10 are arranged apart from each other in the front-rear direction and substantially parallel to each other with the vehicle width direction as the longitudinal direction. Between the pair of rear sub-frame cross members 10,
A differential carrier 14 connected to the left and right drive shafts 12 is arranged.

Further, the pair of rear sub-frame side rails 16 are arranged so as to be separated from each other in the left-right direction and substantially parallel to each other with the longitudinal direction of the vehicle substantially in the longitudinal direction. Each of the rear sub-frame side rails 16 has a curved shape in a plan view, and connects the ends of the rear sub-frame cross member 10 to the front and rear. The rear sub-frame side rail 16 is swingably connected to the inner ends of an upper arm 18 and a lower arm 20 that form a double wishbone type suspension. An axle carrier 24 that rotatably supports wheels (only the disk rotor 22 forming a part of the wheels is shown in FIG. 5) is connected to the outer ends of the upper arm 18 and the lower arm 20. Has been done.

Rear subframe side rail 1 described above
A front body mount 26 is provided at the front end of 6, and a rear body mount 28 is provided at the rear end of the rear subframe side rail 16. And these front body mounts 26
The rear subframe side rails 16 are vibration-proofed and supported on the body side via the rear body mounts 28.

The detailed structures of the front body mount 26 and the rear body mount 28 will be described below with reference to FIGS. 1 and 2.

FIG. 1 shows a front body mount 26.
2 is a vertical sectional view of the rear body mount 28. As shown in FIG. In both figures, although the parts are slightly different in shape from the front side to the rear side, the same reference numerals are given to indicate substantially the same parts.

As shown in these figures, a front body mount 26 and a rear body mount 28 are provided.
Is an inner cylinder 3 fixed between the upper body 30 and the lower body 32 by bolts and nuts not shown.
4, an outer cylinder 36 fixed by being press-fitted into the rear subframe side rail 16, a rubber 38 vulcanized and bonded between the inner cylinder 34 and the outer cylinder 36, and an upper body 30 An insulator rubber 40 interposed between the lower end portion and the upper end portion of the rear subframe side rail 16 or between the upper end portion of the lower body 32 and the lower end portion of the rear subframe side rail 16 is included. ing. The rubber 38 and the insulator rubber 40 that are interposed between the inner and outer cylinders of the above configuration correspond to the “elastic body” in the present invention. Further, the front side body mount 26 and the rear side body mount 2 configured as described above.
Whether the liquid chamber is provided in the rubber 38 of No. 8 and the vibration damping liquid (oil) is sealed or not is arbitrarily selected according to the character of the vehicle.

Here, in the front side body mount 26 and the rear side body mount 28 having the above structure, the rear subframe side rails 16 are displaced relative to the load input direction at the time of starting and accelerating relative to the body. It is characterized in that the clearance is set to be larger than the clearance on the side opposite to the direction in which the rear subframe side rail 16 is relatively displaced.

Specifically, in the past, the body attachment point B (the solid line B in FIG. 3 corresponds to this) was set at the position of the mount center A (two-dot chain line A in FIG. 3 corresponds to this). In this embodiment, the body attachment point B is offset from the mount center A toward the front by a predetermined distance C. As a result, the rear subframe side rail 1
6, the rear end portion 16B of the rear subframe side rail 16 on the body mount insertion side and the inner cylinder 34 are larger than the front clearance 42 formed between the front end portion 16A on the body mount insertion side and the inner cylinder 34. The rear clearance 44 formed between them is set to be larger. That is, there is a relation of "gap dimension (displacement stroke) D of the rear clearance 44> gap dimension (displacement stroke) E of the front clearance 42".

Further, conventionally, the upper and lower clearances are set to be equal, but in the present embodiment, the front body mount 26 is provided between the upper end portion of the rear subframe side rail 16 and the upper body 30. The upper clearance 46 formed is set to be larger than the lower clearance 48 formed between the lower end of the rear subframe side rail 16 and the lower body 32. That is, there is a relation of "gap size (displacement stroke) F of the upper clearance 46> gap size (displacement stroke) G of the lower clearance 48". Regarding the rear body mount 28, on the contrary, the upper clearance 46 is set smaller than the lower clearance 48. That is, the relationship is such that the clearance dimension (displacement stroke) F of the lower clearance 48> the clearance dimension (displacement stroke) G of the upper clearance 46 ”.

Next, the operation and effect of this embodiment will be described.

As shown in FIG. 5, in the case of a rear drive vehicle, the differential carrier 14 is used when starting and accelerating.
Due to the windup, a relatively large moment (upward and downward), which is a relatively large moment (represented by an arrow P in FIG. 5), is input to the rear subframe side rail 16. For this reason, the front end side of the rear sub-frame side rail 16 tends to relatively displace toward the vehicle upper side, and the rear end side of the rear sub-frame side rail 16 tends to relatively displace toward the vehicle lower side. In accordance with this movement, in the present embodiment,
For the front body mount 26, the upper clearance 46 is set larger than the lower clearance 48 as shown in FIG. 1, and conversely for the rear body mount 28, the upper clearance 46 is lowered as shown in FIG. Since the clearance is set smaller than the side clearance 48 (that is, the vertical clearance is set to the acceleration side (driving side)> the deceleration side (braking side)), the linear region on the acceleration side (driving side) can be expanded.

Further, as shown in FIG. 5, at the time of starting and accelerating, the rear subframe side rail 16 is translated through the upper arm 18 and the lower arm 20 toward the front side of the vehicle (this is indicated by an arrow Q in FIG. 5). Is input). Therefore, the rear sub-frame side rail 16 tends to be displaced relative to the vehicle front side with respect to the upper body 30 and the lower body 32. In accordance with this movement, in this embodiment, the rear clearance 44 is larger than the front clearance 42 for both the front body mount 26 and the rear body mount 28, as shown in FIGS. 1 and 2. Since it is set (that is, the clearance in the front-rear direction is set to the acceleration side (driving side)> the deceleration side (braking side)), the linear region on the acceleration side (driving side) can be expanded.

As a result of the above, according to the present embodiment, it is possible to avoid the sudden rise of the spring constant even when a relatively large load is input such as at the time of starting and accelerating. It is possible to effectively suppress vibrations and noises generated when the vehicle is running (dozen noises when starting and noises when accelerating).

On the other hand, when braking, decelerating, or overcoming bumps,
A force that is completely opposite to the moment P and the translational force Q described above is input. That is, as shown in FIG. 5, to the rear sub-frame side rail 16, a forward downward and upward rearward moment P ′ and a vehicle rearward translational force Q ′ are input. Therefore, the relative displacement of the rear sub-frame side rails 16 with respect to the body also occurs in the opposite direction to the case described above. Therefore, if the setting of the magnitude relationship between the rear clearance 44 and the front clearance 42 and the setting of the magnitude relationship between the upper clearance 46 and the lower clearance 48 are completely opposite to those described above, the deceleration side (braking side) )
Thus, the linear range can be expanded, and vibration and noise (harshness during braking, brake vibration, etc., during braking) can be effectively suppressed. In addition, acceleration side (driving side)
Whether to expand the linear area of the vehicle or the linear area on the deceleration side (braking side) may be set according to the character of the vehicle.

As described above, in this embodiment, the rear clearance 44, the front clearance 42, the upper clearance 46, and the lower clearance 48 are set in accordance with the character of the vehicle, so that even when the same mount volume is used, the vehicle is traveling. Vibration and noise in the can be effectively suppressed.

In the present embodiment, the size relationship of the clearance is set in both the front-rear direction and the up-down direction for both the front body mount 26 and the rear body mount 28, but the invention is not limited to this. You may employ | adopt the structure which sets a magnitude relationship only about the clearance of the front-back direction . Even in that case, some effect can be expected.

Further, in the present embodiment, the present invention is applied to the front side body mount 26 and the rear side body mount 28 set on the rear subframe side rail 16, but the present invention is not limited to this, and the front subframe side is not limited thereto. The present invention may be applied to the front body mount and the rear body mount set on the rail. For example, when the present invention is applied to the front side body mount and the rear side body mount set on the front subframe side rails of the rear drive vehicle as in the present embodiment, since no moment is input, the translational force is not input. It is sufficient to set the magnitude relationship only for the clearance in the front-back direction with respect to.

[0031]

As described above, the body mount structure according to the present invention as set forth in claim 1 is a subframe that is integrated into the left and right.
Sub-frames with arm side rails
The inner cylinder fixed to the dee and the outer cylinder fixed to the sub-frame
Includes a cylinder and an elastic body interposed between the inner and outer cylinders and around the cylinder
And the front end of the subframe side rail
Front side body mount and the sub
Rear side body located at the rear end of the frame side rail
Body mount via body mount for vibration-proof support.
Front mount body mount
Subframe on the rear and body mounts
Formed between the front end of the body mount insertion side and the inner cylinder
Front clearance and subframe body
Rear formed between the rear end of the mount insertion side and the inner cylinder
Since the side clearances are different from each other, it is possible to expand the linear area in the direction in which the subframes are displaced relative to each other. It has an excellent effect that harshness at the time of braking, brake vibration, etc.) can be effectively suppressed. Furthermore, the present invention
According to the vehicle character, the front clearance and the rear clearance
By setting the magnitude relationship with the side clearance,
Effectively suppress vibration and noise caused by translational force
It has an excellent effect that it can be done.

[0032]

The body mount structure according to the present invention described in claim 2 is the invention according to claim 1, front
Side body mount and rear body mount
Between the upper end of the subframe and the upper body
Upper clearance formed and lower edge of subframe
Lower clearer formed between the lower part and the lower body
Since the dimensions are different from each other, by setting the magnitude relationship between the upper clearance and the lower clearance according to the character of the vehicle, vibration and noise caused by the moment can be effectively suppressed. Have the effect.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view (cross-sectional view taken along line 1-1 of FIG. 3) showing a structure of a front body mount according to the present embodiment.

FIG. 2 is a vertical cross-sectional view (cross-sectional view taken along line 2-2 of FIG. 3) showing the structure of the rear body mount according to the present embodiment.

3 is an enlarged plan view of a rear sub-frame side rail shown in FIG. 4 (enlarged view of a portion indicated by an arrow 3 in FIG. 4).

FIG. 4 is an overall plan view of a rear subframe side rail and a rear subframe cross member shown in FIG.

FIG. 5 is an overall perspective view of a suspension system and a drive system on the rear side in a rear drive vehicle.

[Explanation of symbols]

16 Rear subframe side rail 16A front end 16B rear end 26 Front body mount 28 Rear body mount 30 Upper body 32 Lower body 34 Inner cylinder 36 outer cylinder 38 Rubber (elastic body) 40 Insulator rubber (elastic body) 42 Front clearance 44 Rear clearance 46 Upper clearance 48 Lower clearance

Claims (2)

(57) [Claims] 1. A left and right integrated subframe side rail
Sub-frames provided are fixed to each body
Between the inner cylinder and the outer cylinder to which the subframe is fixed, and the inner and outer cylinders
And an elastic body interposed around it and
The flap located at the front end of the subframe side rail
Front side body mount and subframe side
Use the rear body mount located at the rear end of the rail.
Through the body mount structure that supports vibration
The front side body mount and the rear side body mount.
Body mount of the subframe in the und
Front side clear formed between the front end on the insertion side and the inner cylinder
Lance and body mount insertion side of the subframe
Rear clearance formed between the rear end and the inner cylinder
Body mount structure characterized by different from each other . 2. The front side body mount and the lid
Above the sub-frame in the body mount on the ya side
An upper clip formed between the end and the upper body.
Alance, the lower end of the sub-frame and the lower body
And the lower clearance formed between
Body mounting structure according to claim 1 which has become, characterized in that to.