JPH08192643A - Vehicular dynamic damper mounting structure - Google Patents

Abstract

PURPOSE: To ensure the prevention of the fall of a mass by laying a dynamic damper in space surrounded by an oil pan and an engine member, and forming a gap between the pan and the damper to such an extent as larger than an engine moving range and capable of preventing the fall of the mass. CONSTITUTION: The rear end of a center member 24 as an engine member is jointed to a vehicular suspension frame, and an engine oil pan 26 is positioned approximately at the intermediate section of the member 24. A dynamic damper 32 with a mass 38 held on a master damper bracket 34 via rubbers 36 and 36 is laid in space surrounded by a recess 28 formed on the bottom of the pan 26 and the upper surface of the member 24. Furthermore, a gap S is formed between the pan 26 and the bracket 34 to such an extent as larger than an engine moving range and stopping the fall of a mass 38. According to this construction, the engine becomes free to move and the fall of the mass 38 is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle dynamic damper mounting structure, and more particularly to a vehicle dynamic damper mounting structure capable of preventing a mass from falling off with a simple structure.

[0002]

2. Description of the Related Art In a vehicle, an engine member is provided to mount a power plant integrally assembled with an engine and a transmission on a vehicle body. However, this engine member may transmit engine vibrations and the like and may adversely affect the vehicle interior noise. Therefore, in order to reduce this adverse effect, a dynamic damper that suppresses targeted vibration due to resonance is provided between the engine member and the engine oil pan.

That is, as shown in FIGS. 8 to 10, a vehicle (not shown) is provided with a suspension subframe 102 oriented in the width direction of the vehicle. The suspension subframe 102 is provided with a center member which is an engine member. The rear end portion 104b of 104 is connected and provided. A front end 104a of the center member 104 is attached to a vehicle body (not shown).

The center member 104 includes a front end portion 104.
The engine front mount 106 is attached to a, and the engine rear mount 10 is attached to the rear end 104b.
8 is attached.

Further, as shown in FIGS.
0 and an oil pan 112 attached to the bottom portion of the engine (not shown), a dynamic damper 114 is attached to the upper surface of the substantially central portion of the center member 104. The dynamic damper 114 includes a mass damper bracket 116, a mass 118 held by the mass damper bracket 116, and a damper mounting that is continuously provided on the lower surface of the mass damper bracket 116 and is inserted into a damper mounting hole 120 of the center member 104. It includes a bolt 122 and a mass drop prevention bracket 124 that prevents the mass 118 from falling off.

In order to mount the dynamic damper 114, as shown in FIGS. 9 and 10, the bottom portion of the oil pan 112 is largely recessed so that the mass drop prevention bracket 124 can be arranged.

A mounting structure for such a dynamic damper is disclosed in, for example, Japanese Utility Model Laid-Open No. 60-112736.
It is disclosed in JP-A-5-147558. In Japanese Utility Model Laid-Open No. 60-112736, a front bumper composed of a bumper face and a backup beam is fixed to a chassis frame through a support bracket, while a space formed by the backup beam and the support bracket. A damper weight for reducing vibration is arranged on the support elastically supported by the support bracket. Japanese Patent Laid-Open No. 5-1
Japanese Patent No. 47558 discloses that a dynamic damper is provided at a connecting portion between a rear end portion of a front side member supporting an engine and a front end portion of a floor under reinforcement to prevent vibration of the engine transmitted to the front side member from being transmitted to the front. When transmitting from the side member to the floor under-reinforce, the dynamic damper provided in the coupling portion significantly attenuates it, thereby effectively damping the vibration of the front side member without increasing the weight of the floor panel, It is intended to sufficiently reduce vibration and noise in the passenger compartment.

[0008]

However, in the conventional mounting structure of the dynamic damper, parts such as a mass drop-off prevention bracket are required to prevent the mass from falling off, so that it is not possible to use the other parts. Therefore, it is necessary to make a large gap between the dynamic damper and other parts, which is disadvantageous in terms of layout, complicates the configuration, causes an increase in weight, and is expensive. Moreover, since the bottom portion of the oil pan is largely recessed, the capacity of the oil pan is reduced, and it is difficult to secure a sufficient amount of oil.

[0009]

In order to eliminate the above-mentioned inconvenience, the present invention provides an engine member for mounting an engine on a vehicle body, and a mass is provided between the engine member and the oil pan of the engine. In a dynamic damper mounting structure for a vehicle, in which the dynamic damper is provided, the dynamic damper is disposed in a space formed by being surrounded by the oil pan and the engine member, and between the oil pan and the dynamic damper. Is provided with a predetermined gap that is larger than the movable range of the engine and that prevents the mass from falling off.

[0010]

According to the structure of the present invention, since the dynamic damper is disposed in the space surrounded by the oil pan and the engine member, it is possible to prevent the mass from falling off without the mass falling prevention bracket. The structure is simplified, the layout is advantageous, the weight is reduced, the price is reduced, and the capacity of the oil pan is increased to easily secure a sufficient amount of oil.

[0011]

Embodiments of the present invention will be described in detail and specifically with reference to the drawings. 1 to 7 show an embodiment of the present invention. 6 and 7, 2 is an engine mounted on a vehicle (not shown), 4 is a transmission, 6 is a power plant in which the engine 2 and the transmission 4 are integrally assembled, 8 is a light side frame, 10 is a left side frame, 12 is a front frame, 14 is an intake manifold, 16 is an exhaust manifold, 18 is a crankshaft, and 20 is a drive shaft. This vehicle is provided with a suspension subframe 22 oriented in the vehicle width direction.

A rear end 24b of a center member 24, which is an engine member, is attached to the suspension frame 22. The front end 24a of the center member is attached to the vehicle body (not shown).

At a substantially central portion of the center member 24,
An oil pan 26 attached to the bottom portion of the engine 2 is located.

At the bottom portion of the oil pan 26 where the center member 24 is located, a recess 28 is formed as shown in FIGS.

A dynamic damper 32 is disposed in a space 30 surrounded by the recess 28 of the oil pan 26 and the upper surface of the center member 24.

The dynamic damper 32 is joined to the upper surface of the center member 24 by a mass damper bracket 34 provided by a fixing means (not shown), and a mass 38 held by the rubber 36, 36 on the mass damper bracket 34. And have.

This dynamic damper 32 is shown in FIGS.
As shown in FIG. 5, the oil pan 26 and the center member 24 are arranged in a space 30.

A predetermined gap S is provided between the outer surface of the oil pan 26 and the outer surface of the mass damper bracket 34, which is larger than the movable range of the engine 2 and prevents the mass 38 from falling off. . This allows the engine 2
Is moved in a predetermined manner and the mass 38 is prevented from falling off.

6 and 7, reference numeral 40 is an engine right mount, 42 is an engine left mount,
44 is an engine front mount, 46 is an engine rear mount, X is a principal axis of inertia, Y is a crank axis, and Z is a drive axis.

Next, the operation of this embodiment will be described.

Engine vibrations and the like from the center member 24 are suppressed by the dynamic damper 32. This can reduce adverse effects on vehicle interior noise.

By the way, in this embodiment, since the dynamic damper 32 is arranged in the space 30 formed by being surrounded by the recess 28 of the oil pan 26 and the center member 24, the conventional mass damper is used. It is possible to prevent the mass 38 from falling off without the falling bracket.

As described above, since the mass drop prevention bracket is not required, the structure is simple, the layout is advantageous, the weight is reduced, the cost is low, and the bottom portion of the oil pan 26 is provided. Since only the recess 28 is formed, it is possible to increase the capacity of the oil pan 26 and easily secure a sufficient amount of oil.

Further, since a predetermined gap S is formed between the outer surface of the mass damper bracket 34 of the dynamic damper 32 and the outer surface of the oil pan 26, the engine 2 can be moved within a predetermined range. At the same time, it is possible to prevent the mass 38 from falling down.

Further, since the mass drop prevention bracket is not required, the chemical treatment can be eliminated at the time of manufacturing the dynamic damper 32, which can reduce the number of working steps and reduce the cost.

[0026]

As is apparent from the above detailed description, according to the present invention, the dynamic damper is disposed in the space formed by being surrounded by the oil pan and the engine member, and between the oil pan and the dynamic damper. By providing a predetermined gap that is larger than the movable range of the engine and prevents the mass from falling off, it is possible to prevent the mass from falling off without the mass falling prevention bracket, thus simplifying the configuration. At the same time, the layout is advantageous, the weight is reduced, the price is reduced, and the capacity of the oil pan can be increased to easily secure a sufficient amount of oil.

[Brief description of drawings]

FIG. 1 is a side view of a center member portion.

FIG. 2 is a cross-sectional view taken along the line 〓-〓 of FIG.

FIG. 3 is a plan view of an oil pan.

FIG. 4 is a front view of an oil pan.

FIG. 5 is a right side view of the oil pan.

FIG. 6 is a plan view of a front portion of the vehicle.

FIG. 7 is a side view of the front portion of the vehicle.

FIG. 8 is an assembly view of a conventional front frame of a vehicle.

FIG. 9 is a side view of a conventional center member portion.

10 is a cross-sectional view taken along line XX of FIG.

[Explanation of symbols]

 2 engine 4 transmission 6 power plant 22 suspension subframe 24 center member 26 oil pan 28 recess 30 space 32 dynamic damper 38 mass

Claims (1)

[Claims] 1. A dynamic damper mounting structure for a vehicle, comprising: an engine member for mounting an engine on a vehicle body; and a dynamic damper provided with a mass between the engine member and an oil pan of the engine. The dynamic damper is arranged in a space formed by being surrounded by the engine member, and a predetermined distance between the oil pan and the dynamic damper is larger than a movable range of the engine and the mass does not drop out. A dynamic damper mounting structure for vehicles, characterized in that a gap is provided.