JP4026372B2 - Vibration isolator for vehicle - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vibration isolator for a vehicle in an automobile engine and transmission mount.
[0002]
[Prior art]
Conventionally, as a mount structure for attaching a power unit including an engine and a transmission to a vehicle body, for example, there is a structure as shown in FIG. 5A is a front view and FIG. 5B is a plan view.
[0003]
This is a case where the power unit is so-called laterally placed in the vehicle width direction. A mount insulator 101 is attached to the other end of the bracket 100, one end of which is attached to the power unit PU by a bolt, and the mount insulator 101 is closed cross-sectional structure. After being embedded in the side member 102 through the mounting hole 103, the mounting flange 104 welded to the outer periphery of the end portion of the mount insulator 101 is attached to the inner side wall 102a of the side member 102 with the bolt 105 and the nut 106. It is what
[0004]
[Problems to be solved by the invention]
However, in the mount structure as described above, the mounting surface of the mount insulator 101 is set to only two surfaces (the vehicle front-rear direction) of the inner wall 102a in the vehicle width direction of the side member 102, so that the mounting rigidity is low. For this reason, in order to increase the mounting rigidity, it is necessary to increase the plate thickness of the side member 102 or to attach a reinforcing material to the mounting surface portion, resulting in a significant increase in weight and an increase in cost. there were.
[0005]
Further, as shown in FIG. 4 (a), in the cross section of the side member 102, the vibration from the engine becomes an offset input (input to the inner wall 102a in the vehicle width direction indicated by hatching in the figure). Therefore, the side member 102 is twisted around the centroid and the vibration and noise increase.
[0006]
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a vibration isolator for a vehicle that can increase the mounting rigidity of a side member without significantly increasing the weight and can effectively suppress twisting input.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, a vibration isolator for a vehicle according to the present invention includes a bracket for mounting a power unit composed of an engine and a transmission to a vehicle body, and a side member having a closed cross-sectional structure positioned outside the bracket. A mounting hole drilled at a predetermined position on an inner side wall in the vehicle width direction of the side member, a mount insulator mounted on the bracket, and a top tubular mounting member fitted on the outer periphery of the mount insulator; The cylindrical main body portion of the mounting member is inserted into the mounting hole, and the top portion is attached to the outer wall in the vehicle width direction of the side member, and the outward flange attached to the cylindrical main body portion has a vehicle width. Each is attached to the inner wall in the direction to increase the attachment rigidity of the side member, and torsional input can be suppressed.
[0008]
Further, when the attachment member is attached to the outer wall in the vehicle width direction of the side member via a stud bolt attached in advance to the attachment member, the attachment work in the side member is eliminated and the attachment workability is improved.
[0009]
Further, when the attachment member is attached to the outer wall in the vehicle width direction of the side member by a bolt via a nut previously attached to the attachment member, the attachment work in the side member is eliminated and the attachment workability is improved. Less protruding to the tire space.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a vibration isolator for a vehicle according to the present invention will be described in detail with reference to the accompanying drawings.
[0011]
FIG. 1 is a perspective view of a vibration isolator for a vehicle according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of an essential part, and FIG. 3 is a cross-sectional view of a modification of a mounting portion on an outer side wall of a side member FIG. 4 is a comparative explanatory diagram regarding torsional input.
[0012]
As shown in FIG. 1, the power unit PU composed of the engine 1 and the transmission 2 is so-called laterally placed in the vehicle width direction of the front part of the vehicle (engine room) and is mounted between the side members 3 of the left and right closed sectional structures ( It is mounted via a mount insulator 8).
[0013]
Specifically, as shown also in FIG. 2, a mount insulator (rubber bush) 8 is attached to the other end of a bracket 7 having one end attached to the power unit PU side by a pair of stud bolts 5 and nuts 6, and this mount insulator. 8 is fitted to the mounting member 4 having a cylindrical shape with an outward flange 4a.
[0014]
A stud bolt 9 is planted outward in the center of the top portion 4 b of the mounting member 4. Further, the outward flange 4a of the mounting member 4 is provided with bolt insertion holes 11 through which the bolts 10 are inserted at two front and rear positions.
[0015]
On the other hand, a mounting hole 12 into which the cylindrical main body 4c of the mounting member 4 can be inserted is formed in the inner wall 3a in the vehicle width direction of the side member 3, and a bolt insertion hole 11 of the outward flange 4a is formed. The bolt insertion hole 13 corresponding to is drilled. A nut 14 that is screwed into the bolt 10 is attached to the back surface side of the vehicle width direction inner side wall 3a corresponding to the bolt insertion hole 13. A bolt insertion hole 15 through which the stud bolt 9 is inserted is formed in the vehicle width direction outer side wall 3 b of the side member 3. In the figure, 16 is a nut that is screwed onto the stud bolt 9.
[0016]
With this configuration, when mounting the power unit PU in the vehicle width direction of the front portion of the vehicle (engine room), the mount insulator 8 and the mounting member 4 that are previously mounted on the power unit PU side are connected via the mounting holes 12. After being embedded in the side member 3, the outward flange 4 a portion of the attachment member 4 is attached to the inner side wall 3 a in the vehicle width direction of the side member 3 with bolts 10 and nuts 14, and the top portion 4 b of the attachment member 4 is attached to the side member 3. What is necessary is just to attach with the stud bolt 9 and the nut 16 to the vehicle width direction outer side wall 3b.
[0017]
In this way, in this embodiment, the mount insulator 8 has a total of three surfaces of the vehicle width direction inner side wall 3a of the side member 3 via the mounting member 4 and one surface of the vehicle width direction outer side wall 3b. Since it is mounted over the surface, the mounting rigidity is increased, and the side member 3 itself having a reduced mounting strength due to the mounting hole 12 is also reinforced, thereby further improving the rigidity of the vehicle body. As a result, there is no need to increase the plate thickness of the side member 3 or to attach a reinforcing material to the mounting surface portion, and a significant weight increase can be avoided and the cost can be reduced.
[0018]
Further, as shown in FIG. 4B, in the cross section of the side member 3, the vibration from the engine is uniformly input to the entire cross section (the vehicle width direction inner side wall 3a and the vehicle width shown by hatching in the figure). Therefore, the torsional input generated around the centroid in the side member 3 is suppressed. As a result, vibration and noise are greatly reduced.
[0019]
Further, as shown in FIG. 3A, the mounting of the top 4b of the mounting member 4 and the outer wall 3b in the vehicle width direction of the side member 3 is replaced with mounting of the stud bolt 9 and the nut 16, You may make it attach by screwing the volt | bolt 21 from the surface side of the said vehicle width direction outer side wall 3b to the nut 20 attached to the back surface side of the top part 4b. According to this, the mounting work in the side member 3 is eliminated as in the mounting of the stud bolt 9 and the nut 16, and the mounting workability is improved, and the protrusion to the tire space side can be reduced.
[0020]
Further, as shown in FIG. 3 (b), in the coupling structure shown in FIG. 3 (a), the mounting member is formed by forming a concave portion 22 in advance in the bolt mounting portion of the outer wall 3b in the vehicle width direction of the side member 3. 4 may be attached to the top 4b. According to this, the protrusion to the tire space side can be further reduced.
[0021]
Needless to say, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention. The present invention can also be applied to a case where the power unit is placed vertically. Moreover, it is applicable regardless of FF, MR, FR, and RR vehicles.
[0022]
【The invention's effect】
As described above, according to the first aspect of the present invention, the bracket for mounting the power unit composed of the engine and the transmission to the vehicle body, the side member having the closed cross-sectional structure located outside the bracket, and the side member A mounting hole drilled at a predetermined position on the inner side wall in the vehicle width direction, a mount insulator mounted on the bracket, and a top cylindrical mounting member fitted on the outer periphery of the mount insulator; The cylindrical main body portion of the mounting member is inserted into the mounting hole and the top portion thereof is attached to the outer wall in the vehicle width direction of the side member, and the outward flange attached to the cylindrical main body portion is provided on the inner side wall in the vehicle width direction. Since it is mounted, the mounting rigidity of the side member can be increased, and the torsional input can be suppressed to reduce vibration and noise.
[0023]
According to the second aspect of the present invention, the mounting member is attached to the outer wall in the vehicle width direction of the side member via a stud bolt attached in advance to the mounting member. Eliminates installation workability.
[0024]
According to the invention of claim 3, the mounting member is attached to the outer wall in the vehicle width direction of the side member by a bolt via a nut previously attached to the mounting member. And the mounting workability is improved, and the protrusion to the tire space side can be reduced.
[Brief description of the drawings]
FIG. 1 is a perspective view of a vibration isolator for a vehicle according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view of the main part of the same.
FIG. 3 is a cross-sectional view of a modified example of a mounting portion on an outer wall in the vehicle width direction of a side member.
FIG. 4 is a comparative explanatory diagram regarding torsional input.
FIG. 5 is an explanatory diagram of a conventional mount structure.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Engine 2 Transmission 3 Side member 3a Car width direction inner side wall 3b Car width direction outer side wall 4 Mounting member 4a Outward flange 4b Top part 4c Cylindrical main-body part 5 Stud bolt 6 Nut 7 Bracket 8 Mount insulator 9 Stud bolt 10 Bolt 11 Bolt Insertion hole 12 Mounting hole 13 Bolt insertion hole 14 Nut 15 Bolt insertion hole 16 Nut PU Power unit

Claims (3)

A bracket for mounting the power unit consisting of the engine and transmission to the vehicle body,
A side member having a closed cross-sectional structure located outside the bracket;
A mounting hole drilled at a predetermined position on the inner wall of the side member in the vehicle width direction ;
A mount insulator attached to the bracket;
A cylindrical mounting member fitted to the outer periphery of the mount insulator;
Have
The cylindrical main body portion of the mounting member is inserted into the mounting hole and the top portion thereof is attached to the outer wall in the vehicle width direction of the side member, and the outward flange attached to the cylindrical main body portion is provided on the inner side wall in the vehicle width direction. An anti-vibration device for a vehicle characterized by being attached.   2. The vibration isolator for a vehicle according to claim 1, wherein the attachment member is attached to an outer wall in the vehicle width direction of the side member via a stud bolt fixed in advance to the attachment member.   2. The vibration isolator for a vehicle according to claim 1, wherein the attachment member is attached to the outer wall in the vehicle width direction of the side member by a bolt via a nut fixed in advance to the attachment member.

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