JP3319236B2 - Power unit support device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power unit supporting apparatus for supporting a power unit for an automobile or the like.

[0002]

2. Description of the Related Art In a reciprocating engine used in an automobile, a crankshaft generates a torsional vibration or a bending vibration by receiving an inertial exciting force due to a reciprocating motion of a piston or a combustion exciting force caused by an explosion in a combustion chamber. . In particular, in an engine having a small number of cylinders, an engine having a high compression ratio, or the like, these vibrations are at a level that cannot be ignored, and the vibrations may be transmitted to the vehicle body and cause occupant discomfort. Therefore, when supporting the engine and the transmission (power unit) integrated therewith, a mount rubber or the like having excellent vibration absorption and damping properties is used, and as shown in FIG. A method of attaching a dynamic damper 2 to a mount bracket 1 is adopted.

As shown in FIG. 6, a dynamic damper 2 has an elastic body 5 interposed between a mounting plate 3 and a weight 4 by vulcanization bonding.
Is fixed to the upper surface of the device by bolts 6 or the like. When the vibration of the mount bracket 1 is transmitted, the weight 4 adhered to the elastic body 5 moves relative to the mount bracket 1 to avoid resonance of a structure including the mount bracket 1 and the engine support bracket 9. In FIG. 5, reference numeral 7 denotes a body panel constituting an engine room, 8 denotes a mount rubber press-fitted into an end of the mount bracket 1, 10;
Denotes an engine to which the engine support bracket 9 is fixed.

[0004]

However, the above-described power unit support device has the following problems. That is, as the elastic body 5 of the dynamic damper 2, a material obtained by kneading various compounding agents into natural rubber, butyl rubber, or the like and vulcanizing it is used, but these rubber materials lose elasticity due to repeated deformation. And causes hardening and swelling due to ultraviolet rays and oils and fats. Therefore, even if the dynamic damper 2 has the expected performance at the beginning of use (at the time of a new vehicle), the vibration absorbing performance gradually decreases after a long period of time, or the weight 4 falls off due to the rupture of the elastic body 5. There is a fear that vibrations may not be absorbed.

[0005] On the other hand, components of automobiles are being reduced in weight in order to improve fuel efficiency and power performance, and engine support brackets 9 and the like have been converted from conventional cast iron to aluminum alloy. However, as is well known, although aluminum alloy has a low specific gravity, it has low rigidity as compared with cast iron, and a resonance point often appears in a practical rotation range of an engine. For this reason, even if the above-described dynamic damper 2 is attached, vibration energy cannot be absorbed by itself, and a problem that the vibration level transmitted to the vehicle body exceeds an allowable range occurs.

[0006] The present invention has been made in view of the above situation,
An object of the present invention is to provide a power unit support device that maintains a desired vibration absorption performance for a long period of time while adopting a relatively simple configuration.

[0007]

SUMMARY OF THE INVENTION In order to achieve this object, according to a first aspect of the present invention, in a power unit supporting apparatus for supporting a power unit on a vehicle body via a bracket , the bracket is supported on an engine side.
It consists of a bracket and a mount bracket on the vehicle body side,
A dynamic damper is provided between the support bracket and the
Recess formed over both und bracket
And the support bracket and the mount
It is proposed that the outside surface be shut off by the joint surface with the bracket . According to a second aspect of the present invention, in the power unit supporting device of the first aspect, the dynamic damper is provided.
The elastic body is interposed between the cylindrical weight and the sleeve.
And the upper and lower surfaces of the cylindrical weight
Is the support bracket and the mounting bracket.
To propose a contact you shall to the door.

[0008]

[0009]

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a power unit support device for a passenger car will be described below in detail with reference to the drawings. In the description of the embodiment, the same members as those of the above-described conventional device are denoted by the same reference numerals. FIG.
Fig. 2 shows a perspective view of a left-side mounting portion of a V-type horizontal engine having an integrated transmission on a vehicle body.
As shown in this figure, an engine support bracket 9 made of aluminum alloy is bolted to the side surface (the end of the crankcase) of the engine 10, while a mount bracket 1 made of cast iron is mounted on the body panel 7 with the mount rubber 8. Attached through. The connection between the engine 10 and the body panel 7 is performed by bolting the engine support bracket 9 and the mount bracket 1 together. A dynamic damper 2 is attached to the upper surface of the end portion of the mount bracket 1, and attenuates the vibration of the engine 10 as in the conventional device. In the present embodiment, two stud bolts 16 are implanted in the engine support bracket 9, and after positioning by coupling with the mount bracket 1 is performed, the nut 17 is used.
And the push bolt 18.

In the present embodiment, as shown in FIGS. 2 and 3, a circular damper holding hole 11 is formed on the upper surface of the engine support bracket 9, and a cylindrical dynamic hole is formed in the damper holding hole 11. The damper 12 is held. The dynamic damper 12 has a cylindrical weight 1.
After the elastic body 15 is interposed between the steel pipe 3 and the sleeve 14 made of steel pipe, the elastic body 15 is integrated by vulcanization bonding, and is press-fitted into the damper holding hole 11. Since the lower surface of the mount bracket 1 is in contact with the upper surface of the engine support bracket 9, the dynamic damper 12 is cut off from the outside air.

Hereinafter, the operation of the present embodiment will be described. Now,
When various vibrations occur with the operation of the engine 10,
These vibrations are transmitted to the body panel 7 via the engine support bracket 9 and the mount bracket 1. However, in the present embodiment, the mounting bracket 1
In addition to the dynamic damper 2 on the side, the dynamic damper 12 built in the engine support bracket 9 also attenuates vibration, so that the amount of vibration transmitted to the body panel 7 is extremely small. Therefore, despite the fact that the engine support bracket 9 is made of an aluminum alloy, the vibration and noise of the vehicle body are suppressed to a very small level, and the riding comfort can be improved.

On the other hand, as described above, the dynamic damper 12 is shut off from the outside air by the engine support bracket 9 and the mount bracket 1, and is not exposed to ultraviolet rays, oils and the like. Therefore, the elastic body 15 hardly deteriorates even after long-term use, and the expected vibration damping performance is maintained. Even if the function of the dynamic damper 2 on the mount bracket 1 side is lost due to the falling off of the weight 4 or the like, the predetermined vibration damping performance is secured by the dynamic damper 12, so that the riding comfort may be significantly deteriorated. lost. In the dynamic damper 12 of the present embodiment, as shown in FIG. 3, the vertical movement of the weight 13 is restricted by the damper holding hole 11 and the lower surface of the mount bracket 1, so that the tensile stress applied to the elastic body 15 is reduced. It becomes smaller and the durability is further improved.

Next, an embodiment in which the storage position of the dynamic damper is changed will be described with reference to FIG. In this embodiment, damper holding holes 11a and 11b are formed in both the mount bracket 1 and the engine support bracket 9, and a dynamic damper 12 is interposed so as to extend over both damper holding holes 11a and 11b. In this embodiment, since the mounting bracket 1 and the engine support bracket 9 are positioned by the dynamic damper 12, the above-described stud bolts for positioning are not required, and the cost can be reduced. In this embodiment, the dynamic damper 12
Is present in both the mount bracket 1 and the engine support bracket 9, so that the vibration damping performance is further improved.

As described above, the power unit supporting apparatus of the above embodiment can solve the problems of performance and durability in the conventional apparatus, and can also reduce the weight of the engine support bracket by using an aluminum alloy. Was. This concludes the description of a specific embodiment, but aspects of the present invention are not limited to this embodiment. For example, in the above embodiment, the present invention is applied to the case where the bracket for supporting the power unit on the vehicle body is divided into two, but the present invention may be applied to the case where a single bracket is used. It is desirable to cover the elastic body of the dynamic damper with a lid or the like formed integrally with the sleeve. Further, the basic structure of the dynamic damper is not limited to the above-described embodiment. For example, a structure in which a spherical weight is arranged in the center of an elastic body, a liquid-sealed type, or the like may be adopted. In addition, the specific configuration of the device, the power unit to be supported, and the like can be appropriately changed without departing from the gist of the present invention.

[0016]

In the power unit support system according to claim 1 of the present invention exhibits, in a power unit support device for supporting the power unit to the vehicle body via a bracket, dynamic
The damper is supported with a support bracket and a mount bracket.
In the recess formed over both
Depending on the joint surface between the mounting bracket and the mounting bracket.
Because it shuts off from the outside air, the dynamic damper
The constituent elastic body hardly deteriorated and used for a long time
In this case, the desired damping performance is maintained, and
Support bracket and mount bracket
The positioning stud bolt is positioned.
Cost can be reduced by eliminating the need for
In addition, the dynamic damper is
Vibration damping performance
In addition Ru can be improved.

Further, according to the power unit supporting device of the second aspect, in the power unit supporting device of the first aspect, the dynamic damper is formed of a cylindrical weight and a three-dimensional weight.
And a cylindrical shape with an elastic body interposed between them.
Mount the upper and lower sides of the Eight
Supports vertical movement of weights due to contact with racket
Regulated by the mounting bracket and the mounting bracket,
The tensile stress applied to the elastic body is reduced, further improving durability
And vibration is damped by the internal friction of the elastic body.
Effectively performed and the dynamic damper is cylindrical
Dynamic damper
And processing of the receiving recess is easily ing.

[0018]

[0019]

[Brief description of the drawings]

FIG. 1 is a perspective view showing a mounting portion of an engine according to the present invention on a vehicle body.

FIG. 2 is a perspective view showing an engine support bracket.

FIG. 3 is a vertical sectional view showing a main part of an engine support bracket.

FIG. 4 is a perspective view showing a dynamic damper.

FIG. 5 is an explanatory view showing a conventional power unit support device.

FIG. 6 is a side view showing a conventional dynamic damper.

FIG. 7 is a longitudinal sectional view showing an embodiment in which a storage position of a dynamic damper is modified.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mount bracket 2 Dynamic damper 7 Body panel 8 Mount rubber 9 Engine support bracket 10 Engine 11 Damper holding hole 12 Dynamic damper 13 Weight 14 Sleeve 15 Elastic body

Continuation of the front page (56) References JP-A-59-183421 (JP, A) JP-A-5-147558 (JP, A) JP-A 1-150125 (JP, U) JP-A 61-57030 (JP , U) Japanese Utility Model Application Showa 56-175527 (JP, U) Japanese Utility Model Application Hei 3-112154 (JP, U) Japanese Utility Model Application Hei 2-48636 (JP, U) Special Table Japanese Utility Model Application 4-500716 (JP, A) (58) Field surveyed (Int.Cl. ⁷ , DB name) F16F 15/02-15/08 B60K 5/00-5/12

Claims (2)

(57) [Claims] 1. A power unit support device for supporting the power unit to the vehicle body via the bracket, the blanking
The racket is the support bracket on the engine side and the
And a dynamic damper.
The support bracket and the mount bracket
Housed in a recess formed over both, and
Joining the support bracket and the mounting bracket
A power unit support device characterized in that the surface is shut off from outside air . 2. The dynamic damper has a cylindrical shape.
A cylindrical shape with an elastic body interposed between the eight and the sleeve
The upper and lower surfaces of the columnar weight are
Wherein the contact to Rukoto racket and the mounting bracket, a power unit supporting apparatus according to claim 1.