JPH08192644A - Vehicular vibration control device - Google Patents

Abstract

PURPOSE: To effectively lessen the transmission of a fan noise and vibration to a body by providing a spring between a lower tank and a lower bracket for constituting a dynamic damper, and forming a gap between an upper bracket and an upper bush. CONSTITUTION: A vehicular vibration control device utilizing a radiator 6 has the upper tank 8 thereof supported on an upper bracket 28 via an elastic upper bush 30, and the lower tank 12 supported on a lower bracket 32 via an elastic lower bush 34. In this case, gaps L1 and L2 are formed between the upper bracket 28 and the upper bush 30, and a spring 78 for resiliently supporting the radiator 6 is fitted between the lower tank 12 and the lower bracket 32. Furthermore, the radiator 6, inlet and outlet hoses connected thereto, and the spring 78 are made to function as a dynamic damper.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle vibration damping device, and more particularly, to a radiator capable of functioning as a dynamic damper under all temperature conditions to achieve vibration damping of a vehicle, thereby functioning as a dynamic damper for a long period of time. Can be maintained to block vibration propagation from the top side of the radiator,
The propagation of fan noise and fan vibration to the vehicle body side can be reduced, and the simple structure that suppresses large displacement with the upper bush of the radiator without providing springs on the upper side and the lower side of the radiator reduces the cost. The present invention relates to a vehicle vibration damping device that can achieve reduction.

[0002]

2. Description of the Related Art When a vehicle is operating, particularly when the engine is running at a low speed, there is a problem that vibrations due to the engine speed propagate to the vehicle body and cause resonance.

Therefore, some vehicles are equipped with a vehicle anti-vibration device for constructing a dynamic damper by utilizing a radiator of an engine mounted on the vehicle to provide anti-vibration of the vehicle. Examples of conventional vehicle vibration damping devices that use a radiator include, for example, Japanese Utility Model Publication No. 64-330 and Japanese Patent Laid-Open No. 4-4336.
Publication, Japanese Examined Patent Publication No. 63-43246, Japanese Utility Model Publication No. 59-
There are those disclosed in Japanese Patent No. 90638, Japanese Utility Model Laid-Open No. 57-141118, and the like.

In Japanese Utility Model Publication No. 64-330, a radiator is elastically supported on a vehicle body through a rubber bush, and the spring constant of the rubber bush in the vertical direction is a radiator mass containing cooling water and engine idle operation. The resonance frequency of the vehicle body is suppressed by setting the value determined by the vertical frequency of the vehicle body at that time.

Japanese Patent Laid-Open No. 4-4336, Japanese Patent Publication No. 63-
No. 43246, No. 59-90638, and No. 57-141118, each of which discloses a radiator, which elastically supports a radiator via a spring or the like, to prevent vibration of the vehicle body.

[0006]

However, the spring constant of the rubber bush for elastically supporting the radiator disclosed in Japanese Utility Model Publication No. 64-330 is set to a value that suppresses the resonance of the vehicle body to function as a dynamic damper. However, there is a problem that the spring constant greatly changes with the temperature of the rubber bush.

Therefore, as shown in FIG. 6, the one disclosed in Japanese Utility Model Publication No. 64-330 has (A) at room temperature.
Since it can function as a dynamic damper (D) and can have a vibration damping effect (E), the resonance frequency of the dynamic damper changes at low temperature (B),
Not only cannot it function as a dynamic damper at low temperatures, but it also has a disadvantage (C).

Further, the rubber bush has a problem that permanent distortion occurs over time due to repeated vibrations and the influence of heat, and it is difficult to maintain the function of the dynamic damper for a long period of time.

On the other hand, the one disclosed in Japanese Patent Laid-Open No. 4-4336 and three others that elastically supports a radiator via a spring to function as a dynamic damper is temperature-dependent like the rubber bush. However, not only the springs are provided on the upper and lower sides of the radiator, but also the stopper mechanism for restraining the large displacement of the radiator is required. There is the inconvenience of requiring a mounting space for the mechanism.

[0010]

Therefore, in order to eliminate the above-mentioned inconvenience, the present invention provides an upper tank of a radiator supported by an upper bracket attached to a vehicle body upper member via an elastic upper bush. The lower tank of the radiator is supported by a lower bracket attached to a vehicle lower member via an elastic lower bush, a gap is provided between the upper bracket and the upper bush, and the radiator is provided between the lower tank and the lower bracket. It is characterized in that a dynamic damper is constituted by the radiator and a component connected to the radiator via a spring that elastically supports the spring and the spring.

[0011]

According to the structure of the present invention, the vehicle vibration damping device is
Since the dynamic damper is constructed by providing the spring only between the lower tank and the lower bracket of the radiator, the temperature dependence is less like the conventional rubber bush, and the structure is simple. By providing a gap between the upper bracket and the upper bush on the upper side, it is possible to block the large displacement of the radiator by the upper bush and block the vibration propagation from the upper side.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 5 show an embodiment of the present invention. In FIG. 5, 2 is a vehicle body side upper member (not shown), 4 is a vehicle body side lower member, 6 is a radiator, and 8 is a radiator.
Is an upper tank, 10 is a core, and 12 is a lower tank.

The radiator 6 is provided with an inlet pipe 14 for introducing cooling water from an engine (not shown) in an upper tank 8 and an outlet pipe 16 for supplying cooling water to the engine in a lower tank 12. An inlet hose 18 and an outlet hose 20 are connected to the inlet pipe 14 and the outlet pipe 16, respectively. Further, the upper tank 8 is provided with a supply port portion 22 and a cap 24 is detachably provided.

A vehicle vibration damping device 26 utilizing the radiator 6 is provided by supporting the upper tank 8 of the radiator 6 on an upper bracket 28 attached to the vehicle body upper member 2 via an elastic upper bush 30. The lower tank 12 is attached to the lower member 4 on the vehicle body side, and an elastic lower bush 34 is attached to the lower bracket 32.
It is provided through the support.

An upper side fitting shaft 36 is provided on the upper surface of the upper tank 8. The upper bush 30 is fitted to the upper fitting shaft 36. Upper bush 30
As shown in FIG. 2, the upper tank 8 is formed in a substantially stepped cylindrical shape by a large-diameter portion 38 on the upper surface-adjacent side and a small-diameter portion 40 on the upper surface-separated side, and is fitted with the upper fitting shaft 36. An upper fitting hole 42 is provided. A lip portion 44 is provided on the outer peripheral edge of the large-diameter portion 38 so as to project toward the upper bracket 28.

The upper bracket 28 has a cylindrical upper bracket side engaging wall 48 in which an upper bracket side engaging hole 50 is formed in the upper body 46. The inner diameter D1 of the upper bracket side engagement hole 50 is equal to that of the upper bush 30.
It is formed to be larger than the outer diameter D2 of the small diameter portion 40. As shown in FIG. 2, the upper bracket 28 and the upper bush 30 are provided with a circumferentially uniform gap L1 between the inner peripheral surface of the upper bracket side engagement wall 48 and the outer peripheral surface of the small diameter portion 40, and the upper main body. A gap L <b> 2 is provided between the lower surface of 46 and the upper end of the lip portion 44 to be engaged.

Further, the upper bracket 28 has an upper bracket side mounting hole 52 in the upper body 46.
An upper locking body 54 for positioning is provided on the lower surface of a portion of the upper body 46 where the upper bracket side mounting hole 52 is formed, and an upper locking body mounting hole 56 that matches the upper bracket side mounting hole 52 is provided. . In the vehicle body side upper member 2, an upper member side mounting hole 60 into which an upper mounting bolt 58 for mounting the upper bracket 28 is screwed.
Is provided.

A lower side fitting shaft 62 is provided on the lower surface of the lower tank 12. The lower bush 34 is fitted to the lower fitting shaft 62. As shown in FIGS. 1 and 3, the lower bush 34 has an annular plate shape that connects the inner cylindrical portion 64 on the radial center side, the outer cylindrical portion 66 on the radial outer peripheral side, the inner cylindrical portion 64, and the upper portion of the outer cylindrical portion 66. The connecting portion 68 and the annular plate-shaped projecting edge portion 70 projecting in the radial center direction on the lower portion of the outer tubular portion 66 are formed into a substantially double cylinder shape with a lid.

The lower bush 34 is provided with a lower side fitting hole 72 into which the lower side fitting shaft 62 is fitted in the inner cylindrical portion 64, and an upper portion is provided between the inner cylindrical portion 64 and the outer cylindrical portion 66 by a connecting portion 68. An annular internal space 74 that is closed and whose lower portion is opened by the projecting edge portion 70 is formed. Also, lower bush 3
No. 4 is provided with a stopper portion 76 projecting radially outward on the outer periphery of the upper portion of the outer tubular portion 66.

A spring 78 for elastically supporting the radiator 6 is installed in an internal space 74 between the inner cylindrical portion 64 and the outer cylindrical portion 66 of the lower bush 34. As shown in FIG. 4, the spring 78 is formed of a metal material such as a stainless material into a tapered coil shape. The spring 78 installed in the inner space 74 of the lower bush 34 has inner and outer cylindrical portions 64 and 6 respectively on the inner side and the outer side so as to avoid direct contact with the lower tank 12 and the lower bracket 32.
6, the upper side and the lower side are covered with the connecting portion 68 and the projecting edge portion 70.

The lower bracket 32 is a lower body 80.
A lower bracket side engagement hole 84 is formed by a cylindrical lower bracket side engagement wall 82. The inner diameter of the lower bracket side engagement hole 84 is formed to be substantially the same as the outer diameter of the outer tubular portion 66 of the lower bush 34. Lower bracket side engagement wall 8
2, the contact portion 86 is provided at the upper portion so as to project radially outward, and the annular plate-shaped protrusion portion 88 is provided at the lower portion so as to project in the radial center direction. The abutting portion 86 abuts the stopper portion 76 when the radiator 6 is maximally displaced, so that the radiator 6
Regulate the maximum displacement of. The protruding portion 88 is the protruding edge portion 7 of the lower bush 34 engaged with the lower bracket side engaging hole 84.
0 is abutted.

Further, the lower bracket 32 is composed of the lower body 8
No. 0 has a lower bracket side mounting hole 90. The vehicle body side lower member 4 is provided with a lower member side mounting hole 94 into which a lower mounting bolt 92 for mounting the lower bracket 32 is screwed.

As a result, the vehicle vibration damping device 26 has the gap L1 between the upper bracket 28 and the upper bush 30.
-Providing L2, lower tank 12 and lower bracket 32
A spring 78 for elastically supporting the radiator 6 is interposed between the radiator 6 and the inlet hose 18 and outlet hose 20 which are components connected to the radiator 6 and the spring 78 to form a dynamic damper.

Next, the operation will be described.

This vehicle anti-vibration device 26 includes a radiator 6
A spring 78 is incorporated in the inner space 74 of the lower bush 34, and the lower bush 34 is fitted into the lower fitting shaft 62 of the lower tank 12 by the lower fitting hole 72 of the inner tubular portion 64. The lower bracket 32 is mounted by screwing a lower mounting bolt 92 inserted into the lower bracket side mounting hole 90 into a lower member side mounting hole 94 of the vehicle body side lower member 4.

The radiator 6 engages the lower bush 34 with the lower bracket side engaging hole 84 of the lower bracket 32 attached to the vehicle body side lower member 4 to attach the lower tank 12 to the vehicle body side lower member 4. It is supported and provided via an elastic lower bush 34.

Further, the radiator 6 is the upper bush 3
0 is fitted into the upper fitting shaft 36 of the upper tank 8 through the upper fitting hole 42. As shown in FIG. 2, the upper bracket 28 is provided with a gap L1 between the upper bracket side engagement edge 48 and the small diameter portion 40, and the upper body 46.
A gap L2 is provided between the upper bush 30 and the lip portion 44, and the small diameter portion 40 of the upper bush 30 is inserted in the upper bracket side engagement hole 50.
And the large-diameter portion 38 is disposed opposite to the upper body 46, and the upper mounting bolt 58 inserted through the upper bracket side mounting hole 52 and the upper locking body mounting hole 56 is attached to the upper member side mounting hole of the vehicle body side upper member 2. Attach by screwing to 60.

The radiator 6 engages the small diameter portion 40 of the upper bush 30 with the gap L1 in the upper bracket side engagement hole 50 of the upper bracket 28 attached to the vehicle body side upper member 2 and the upper body 46. A gap L2 is provided between the lip portion 44 and the lip portion 44 so that the lip portion 44 is engaged with the lip portion 44 so that the upper tank 8 is elastically attached to the upper bracket 28 attached to the vehicle body side upper member 2.
It is provided by supporting it through 0.

As a result, the vehicle vibration damping device 26
A spring 78 that elastically supports the radiator 6 is interposed between the lower tank 12 and the lower bracket 32, and a dynamic damper is configured by the radiator 6 and the inlet hose 18 and the outlet hose 20 connected to the radiator 6 and the spring 78. There is.

Therefore, the vehicle anti-vibration device 26 can reduce the resonance of the vehicle body that occurs when the vehicle is operating, particularly in the idle rotation band of the engine. Moreover, since the vehicle vibration-damping device 26 is provided with the spring 78 only on the lower side, it is not affected by temperature conditions unlike the conventional rubber bushing, and has a simple structure and can be used at all temperatures. The radiator 6 can function as a dynamic damper under the condition (for example, -30 ° C to 50 ° C), and the vibration damping of the vehicle can be achieved, and the function of the dynamic damper can be maintained for a long time.

Further, in this vehicle vibration damping device 26, the taper coil-shaped spring 78 is provided in the lower bush 34, so that the lower bush 34 is not rubbed with the inner cylinder portion 64, and the space between the lower tank 12 and the lower bracket 32 is prevented. It is possible to prevent the tapping sound from being generated, and to prevent the occurrence of electrolytic corrosion when the spring 78 is made of a stainless material.
Further, the elastic lower bush 34 can prevent the spring 78 installed therein from being soiled and prevent the lower tank 12 from cracking when the lower tank 12 is made of resin, and a stopper portion that contacts the contact portion 86 of the lower bracket 32. By providing 76, the maximum displacement of the radiator 6 can be restricted.

Further, the vehicle anti-vibration device 26 includes front and rear, left and right, between the upper bracket 28 and the upper bush 30.
A gap L1 is provided in each of the up and down directions, that is, in the circumferential direction of the outer circumference of the small diameter portion 40 of the upper bush 30 with respect to the upper bracket 28, and the lip portion 4 of the upper bush 30 is provided.
A gap L2 is provided in the height direction of No. 4. Further, in the vehicle vibration damping device 26, the upper bush 30 is provided with a lip portion 44 that cushions an impact at the time of large displacement of the radiator 6 so as to face the upper body 46 of the upper bracket 28.

As a result, the vehicle vibration damping device 26 is
The lip portion 44 of the upper bush 30 can suppress large displacement of the radiator 6, while the gaps L1 and L2 can block vibration propagation from the upper side.

Therefore, the vehicle vibration-damping device 26 can cut off the propagation of vibrations from the upper side, so that it is possible to reduce the propagation of fan noise and fan vibration to the vehicle body side. The cost can be reduced by the simple structure in which the spring 78 is provided only on the lower side without providing the spring on the lower side and the large displacement is suppressed by the upper bush 30 on the upper side of the radiator 6.

[0035]

As described above, according to the present invention, the vibration isolator for a vehicle has less temperature dependency as in the conventional rubber bush, has a simple structure, and suppresses large displacement of the radiator. The vibration propagation from the upper side can be blocked.

Therefore, in this vehicle vibration isolator, the spring provided only on the lower side of the radiator can cause the radiator to function as a dynamic damper under all temperature conditions, and can achieve vehicle vibration isolation for a long period of time. The function of the dynamic damper can be maintained, and the cost can be reduced by the simple structure. In addition, this vehicle vibration damping device can reduce the propagation of fan noise and fan vibration to the vehicle body side by blocking the vibration propagation from the upper side. Further, this vehicle vibration damping device can achieve cost reduction by a simple structure in which large displacements are suppressed by the upper bushes of the radiator without providing springs on the upper side and the lower side of the radiator, respectively.

[Brief description of drawings]

FIG. 1 is a sectional view of a lower tank portion of a radiator of a vehicle vibration damping device according to an embodiment of the present invention.

FIG. 2 is a sectional view of an upper tank portion of a radiator.

FIG. 3 is a half sectional view of a lower bush.

FIG. 4 is a side view of a spring.

FIG. 5 is an assembled perspective view of a vehicle vibration damping device.

FIG. 6 is a diagram showing a relationship between frequency and vibration acceleration according to a temperature condition showing a conventional example.

[Explanation of symbols]

 2 Vehicle side upper member 4 Vehicle side lower member 6 Radiator 8 Upper tank 10 Core 12 Lower tank 18 Inlet hose 20 Outlet hose 26 Vehicle anti-vibration device 28 Upper bracket 30 Upper bush 32 Lower bracket 34 Lower bush 38 Large diameter section 40 Small diameter section 42 Upper Side fitting hole 44 Lip part 46 Upper body 48 Upper bracket side engaging wall 50 Upper bracket side engaging hole L1 Gap L2 Gap 58 Upper mounting bolt 64 Inner cylinder part 66 Outer cylinder part 68 Connecting part 70 Projection edge part 72 Lower side Fitting hole 74 Internal space 76 Stopper portion 78 Spring 80 Lower body 82 Lower bracket side engaging wall 84 Lower bracket side engaging hole 86 Abutting portion 88 Protruding portion 92 Lower mounting bolt

Claims (3)

[Claims] 1. An upper tank of a radiator is supported by an upper bracket attached to an upper member of a vehicle body via an elastic upper bush, and the lower tank of the radiator is attached to a lower bracket of the vehicle body by an elastic lower member. It is supported by a bush, a gap is provided between the upper bracket and the upper bush, and a spring elastically supporting the radiator is provided between the lower tank and the lower bracket, and the radiator and the radiator are connected to each other. An anti-vibration device for a vehicle, characterized in that a dynamic damper is constituted by the component parts and the spring. 2. The vehicle according to claim 1, wherein a spring elastically supporting the radiator is provided in the lower bush so as to avoid direct contact with the lower tank and the lower bracket. Anti-vibration device. 3. The vibration isolator for a vehicle according to claim 1, wherein the lower bush is provided with a stopper portion that is in contact with the lower bracket and restricts the maximum displacement of the radiator.