JPH07266896A - Supporting structure of radiator - Google Patents

Abstract

PURPOSE:To lessen the vibration of car body even at low temperature in the case of making use of a radiator as a dynamic damper. CONSTITUTION:In the supporting structure of a radiator 3, which is arranged with its bottom and top supported by a front member 1 and a front upper member 2, the front member 1 is provided with a coil spring 10, and the radiator 3 is placed through a coil spring 10, and the radiator 3 is supported, making the front upper member 2 have a play for vertical motion of the radiator 3. The resonance frequency of set vibration can have even at low temperature by the property of the coil spring 10 being not influenced much by temperature and the displacement of upward and downward motion of the radiator 3 can be taken large.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radiator support structure installed so as to suppress vibration when an automobile engine operates.

[0002]

2. Description of the Related Art Conventionally, in order to suppress a vibration of a vehicle body during idling when operating an engine of a vehicle or a vibration during traveling, an engine mount or a suspension is mounted as a vibration absorption characteristic suitable for the vehicle body. There is. A radiator installed in the engine room is effective as a mass damper.

It has been proposed to positively vibrate the radiator at a certain resonance frequency to cancel the resonance of the vehicle body as a dynamic damper to reduce the vehicle body vibration. As shown in FIG. 7, this is to be mounted via a mount rubber (rubber bush) 4 when mounting the upper part and the lower part of the radiator 3 to a vehicle body member (front lower member 1 and front upper member 2) ( See the Official Gazette No. 64-330). Alternatively, as shown in FIG. 8, a coil spring 5 is attached in parallel to the mount rubber 4 (see Japanese Utility Model Laid-Open No. 57-141118), or as shown in FIG. 9, the entire radiator 3 is coil spring 5 (or Some are supported by leaf springs (Japanese Patent Laid-Open No. 4-43)
36, Japanese Utility Model Laid-Open No. 59-90638).

[0004]

However, with regard to the elastic member that is elastically supported through the mount rubber 4 and functions as a dynamic damper, the mount rubber 4 has a large change in spring constant with respect to temperature, and therefore the dynamic damper is normal at room temperature. Even if it is used as a rubber, the rubber is hardened at a low temperature and the function is lowered. As an example, as shown in FIG. 10, the radiator vibration at normal time (normal temperature) has a peak as shown by the solid line a, but the radiator vibration when the rubber is cured has a peak as shown by the one-dot chain line b. Moves to the higher side and the peak value becomes lower. That is, the resonance frequency of the dynamic damper is changed to a high level, the vibration of the radiator 3 is reduced, the performance as the dynamic damper is deteriorated, and there is a possibility that vibration noise becomes strong during traveling at low temperature.

Considering the vibration of the vehicle body as a dynamic damper, as shown in FIG. 11, first, when there is no dynamic damper, the vehicle vibration is along the dotted line c. When the dynamic damper by the radiator 3 is used, it is synergistic with the characteristic shown by the solid line a in FIG. 10, and the characteristic shown by the solid line d in FIG. 11 is obtained, and there is the effect of the shaded portion shown in the figure. However, when the rubber is cured, the characteristics shown by the alternate long and short dash line e are obtained, and the effect of the damper is reduced.

In addition, although a spring which is elastically supported by a spring such as a coil spring 5 and functions as a dynamic damper has a small spring constant in temperature dependence, the radiator 3
Since springs are attached to both the upper and lower sides to restrain the displacement of the vertical movement of the, and a stopper structure that suppresses the displacement of the radiator 3 is assembled, the cost is increased and extra space is required.

It is an object of the present invention to provide a radiator support structure which uses a spring having a low temperature dependence and can cope with the magnitude of displacement.

[0008]

In order to achieve the above object, the present invention provides a radiator support structure in which a lower part and an upper part are supported by a front lower member and a front upper member. The lower member is provided with a spring, the radiator is mounted via the spring, and the front upper member is provided with play for vertical movement of the radiator to support the radiator.

According to the present invention, a rubber bush is provided on the front upper member via a bracket, and the upper portion of the radiator is engaged with the rubber bush with a vertical gap.

Further, the present invention is characterized in that a rubber member is provided at each of the lower portion of the radiator and the front lower member located below the radiator and separated by a predetermined distance.

Further, in the present invention, the spring used may have a coil shape or a plate shape.

[0012]

The present invention is constructed as described above. Since the lower part of the radiator is supported by the spring and the upper part of the radiator is supported with play, the spring is involved in the resonance frequency of vibration. Since the characteristics of the spring are not significantly affected by temperature, the resonance frequency of vibration is almost unchanged. In addition, displacement due to vibration can be made sufficiently large.

By supporting the upper portion of the radiator with play by means of a rubber bush, the displacement due to vibration is not affected, and the vibration can be suppressed by the elasticity of the rubber bush in the event of an excessive impact. Further, by interposing a rubber member (rubber bush, rubber sheet, etc.) under the radiator, it is possible to prevent tapping of the metal part.

If the spring is a coil spring,
The protrusion is inserted in the center of the coil at the bottom of the radiator to simplify the installation. Further, the plate spring has a simple shape and is easy to assemble.

[0015]

Embodiments of the present invention will be described below with reference to the accompanying drawings. As shown in FIG. 1, an engine 6 and a transmission 7 connected to the engine 6 are mounted in the engine room, and a radiator 3 is connected via a cooling water hose 8. The cooling water hose 8 is made of rubber and can serve to supplement the vibration damping of the radiator 3.

As shown in FIG. 2, the radiator 3 is mounted by inserting a projection 3a protruding from the lower portion of the radiator 3 into a coil spring 10 attached to a bracket 9 fixed to the front lower member 1. ing. The coil spring 10 is formed in a substantially conical shape. A rubber bush 12 is attached to the bracket 11 fixed to the front upper member 2, and a protrusion 3b provided on the upper portion of the radiator 3 is inserted into the rubber bush 12 so as to be vertically movable.

With the above structure, the vibration generated during idling of the engine 6 and the vibration during traveling vibrate the radiator 3 and use the radiator 3 as a dynamic damper. Then, the coil spring 10 installed in the lower portion of the radiator 3 makes the deviation of the resonance frequency at a low temperature small, and the vibration noise can be reduced. Also, it becomes possible to adapt to running at low temperatures.

When supporting the upper portion of the radiator 3, as shown in FIG. 3, the protrusion 3b may be supported by a synthetic resin coupler 13 if the gap between the radiator 3 and the bracket 11 is large.
Further, by placing a rubber sheet (rubber member) 14 between the lower bracket 9 and the coil spring 10, vibration noise can be reduced. Further, as shown in FIG. 4, a rubber bush (rubber member) 15 having flanges formed on the upper and lower ends of the coil spring 10 is fitted and inserted, and the projection 3a provided on the lower portion of the radiator 3 is inserted into the rubber bush 15. You can In this case, by installing the rubber bush 15 side by side, the resonance frequency can be adjusted to some extent,
Further, the vibration noise is reduced, and the rubber bush 15 is made to work against excessive vibration.

The support structure for the radiator 3 shown in FIG.
Plate spring instead of the coil spring 10 above
16 is used. The plate-shaped spring 16 has a step between the surface fixed to the bracket 9 and the surface supporting the radiator 3 so that the radiator 3 is supported by floating from the bracket 9. The amount of displacement of the radiator 3 can be adjusted by the thickness of a stopper rubber (rubber member) 17 provided below the plate spring 16. When the elastic force and the displacement amount of the plate spring 16 are changed, as shown in FIG. 6, the plate spring 16 may have a large step and the stopper rubber 17 may be attached to both opposing surfaces thereof. Further, since the vertical movement of the radiator 3 is fluctuated by the plate-shaped spring 16, a small protrusion 12a is formed on the rubber bush 12 so as to contact the protrusion 3b on the upper portion of the radiator 3.

[0020]

Since the present invention is configured as described above, a spring provided in the lower portion of the radiator and
With the radiator supported so as to be vertically movable, it is possible to cope with the magnitude of displacement when vibrating, and the radiator can function as a dynamic damper for all operating temperatures. In addition, the upper support becomes simple, and since only the spring to which the load of the radiator is loaded is attached to the lower part, the manufacturing cost can be reduced and the space can be saved. Further, since the vibration propagation from the upper part is eliminated, the propagation of fan noise and fan vibration to the vehicle body can be reduced.

[Brief description of drawings]

FIG. 1 is an overall perspective view of a radiator support structure according to an embodiment of the present invention.

FIG. 2 is a side sectional view of the radiator support structure shown in FIG.

FIG. 3 is a side sectional view showing a state in which a rubber material is provided in a lower portion of the radiator shown in FIG.

FIG. 4 is a side sectional view showing a modified example in which a rubber material is provided below the radiator shown in FIG.

FIG. 5 is a side sectional view showing that a plate-shaped spring is provided in a lower portion of a radiator of another embodiment.

FIG. 6 is a side sectional view showing a modified example of the support structure shown in FIG.

FIG. 7 is a side cross-sectional view showing a conventional radiator support structure.

8 is a side sectional view showing a modified example of the support structure shown in FIG.

9 is a side sectional view showing a modified example of the support structure shown in FIG.

FIG. 10 is a graph showing radiator vibration of a conventional radiator support structure.

FIG. 11 is a graph showing vehicle body vibration of a conventional radiator support structure.

[Explanation of symbols]

 1 front lower member 2 front upper member 3 radiator 10 coil spring 11 bracket 12 rubber bush 14 rubber member 16 plate spring

Claims (5)

[Claims] 1. In a radiator support structure in which a lower portion and an upper portion are supported by a front lower member and a front upper member, a spring is provided on the front lower member, and the radiator is mounted via the spring. The radiator supporting structure is characterized in that the radiator is supported by allowing the front upper member to have a play of vertical movement of the radiator. 2. The radiator support according to claim 1, wherein the front upper member is provided with a rubber bush via a bracket, and the upper portion of the radiator is engaged with the rubber bush with a vertical gap. Construction. 3. The radiator support structure according to claim 1, wherein a rubber member is provided at each of a lower portion of the radiator and a front lower member located below the radiator with a predetermined distance therebetween. 4. The radiator support structure according to claim 1, wherein the spring has a coil shape. 5. The radiator support structure according to claim 1, wherein the spring has a plate shape.