JPS62151641A - Method for preventing vibration for component for vehicle - Google Patents

Abstract

PURPOSE:To prevent or damp down vibration by applying a voltage to a piezo-electric material which is covered over a vehicle component such as a door panel, etc. and giving a vibration of frequency which offsets a vibration applied to said vehicle component. CONSTITUTION:A vehicle component such as a door panel 1, etc. is covered with a layer of piezo-electric material such as a barium titanate layer 2, etc., and a layer of an electrode such as an aluminum layer 3, etc. is formed on top of it. The vehicle component and the electrode layer are connected to a DC power source 5 via a lead wire 4, to apply a voltage to the piezo-electric material layer. Since the piezo-electric material layer generates a natural resonance vibration inherent in piezo-electric material, vibration can be prevented or damped down by covering the vehicle component with a piezo-electric material which generates an oscillation frequency desired to be offset.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a method for preventing vibration of automobile components.

[Conventional technology]

In the case of automobiles, engine vibrations, drive system vibrations, road surface irregularities, etc. act as vibration forcing forces, and the vibrations caused by these forces resonate with automobile components or are transmitted to other automobile components. Generates complex vibrations and noise. Such vibrations and noises cause discomfort to passengers, and various methods have been used to combat these vibrations and noises.

In order to prevent vibration and noise (hereinafter simply referred to as vibration), it is desirable to take measures against the vibration source itself, but in the case of automobiles, it is often difficult to take measures against the vibration source, and the resonance system, transmission system, Countermeasures are often taken using radiation systems.

If we look at radiation systems as an example, for example, we have welded asphalt sheets to the floor of a car, and we also have foams and resin laminates that have a damper effect bonded to car components by appropriate methods, and welded car parts. Measures such as increasing the wall thickness of the

[Problem that the invention seeks to solve]

By the way, in the above-mentioned conventional method, the wall thickness of the automobile component parts is reduced to II (sheet thickness), and the asphalt sheet is attached, which increases the weight, which is unfavorable in terms of the performance of the automobile. Methods for bonding foams have a certain amount of PJ, which can lead to narrow spaces and peeling due to vibrations, etc. In addition, these methods also contribute to high costs. was.

Therefore, there was a need for a new device that is lightweight, requires only a small amount of space, and can reliably prevent vibrations.

[Means for solving problems]

The above-mentioned problem is solved by the vibration prevention method for automobile component parts of the present invention, which will be described below.

That is, in the method for preventing vibration of an automobile component of the present invention, a piezoelectric material layer made of titanate, niobate, etc. is formed on at least a part of the automobile component to be prevented from vibration, and the piezoelectric material layer is further After forming an electrode layer thereon, the automotive component and the electrode are connected to a DC power source via lead wires, and when the vehicle is running, a predetermined voltage is applied from the DC power source to the automotive component. It is characterized by applying a frequency that cancels out the applied vibrations.

Next, the present invention will be explained in detail.

Automotive components to which the present invention can be applied include, for example, door panels, roof panels, floor panels, etc. In short, the present invention can be applied to any component as long as it is made of a conductive material such as steel.

Piezoelectric materials used in the present invention include barium titanate (BaTiOz), lead titanate (r-'bT+
Oi), potassium niobate (KNbO,), and p b
i' i 0. qBZ r O, 5202, Pb
(Mg., 3Nb0.7)O,J PbTiO3Pb
Zr0. , etc. can be used. One or more of these piezoelectric materials are used. The piezoelectric material can be coated (adhered) to the automotive component by any suitable method, for example by thermal spraying, preferably by plasma spraying. The thickness of coating this piezoelectric material is, for example, Q,
A value of about 2 dragons to 2.01 stars is desirable. The thickness of this piezoelectric material layer is determined as appropriate in consideration of the vibration frequency to be damped, the type of piezoelectric material, and the like.

In addition, as electrode materials, silver (Ag), platinum (Pt),
Copper (Cu), aluminum (/l), cadmium (Cd
), zinc (Zn), nickel (Ni), etc. can be used. One or more of these materials may be used in combination. This electrode material is formed on the piezoelectric material layer by a vacuum film forming method such as a vacuum evaporation method, an ion blating method, or a sputtering method, or by chemical plating. At this time, it is desirable to use a vacuum film forming method for aluminum, chemical plating or paste coating for silver and platinum, and chemical plating for other materials such as cadmium, zinc, copper, and nickel.

After forming the piezoelectric material layer and the electrode layer, polarization treatment is performed using a conventional method.

Thereafter, the IJ-T wire is drawn out from the automobile component and the electrode layer and connected to a DC power source.

[Effect]

According to the vibration prevention method for automobile components of the present invention, by applying a predetermined voltage to the piezoelectric material layer, a frequency that offsets vibrations generated in the automobile components can be imparted, thereby achieving vibration isolation. .

That is, while an automobile is running, various vibrations are generated due to conditions such as unevenness of the JQ road, explosive combustion of the engine, resonance of suspension parts, etc. This vibration often has a certain frequency for each specific part, such as a door panel. On the other hand, when a piezoelectric material and an electrode are laminated on such an automobile component and a DC voltage is applied between the electrode and the automobile component, a natural resonance vibration specific to the piezoelectric material, for example 1000 Hz to 10000 kl, is generated.
z can be generated. Therefore, by installing a piezoelectric material that generates the vibration frequency that you want to cancel in the car component parts and applying a voltage while driving, you can cancel the vibration, reduce the vibration frequency, or It is possible to shift to a frequency region or a low frequency region, and as a result, vibration can be prevented or reduced.

〔Example] Next, embodiments of the present invention will be described with reference to the drawings.

Here, FIG. 1 is a sectional view of a main part showing a state in which a method for preventing vibration of automatic 11 components according to an embodiment of the present invention is applied to a door panel.

First, after thoroughly cleaning and drying the inner surface of the door panel l as an automobile component, about 0.5 mm of barium titanate with an average particle size of 20 μm (particle size range: 5 μm to 80 μm) is applied to the inner surface as a piezoelectric material. A barium titanate layer (piezoelectric material layer) 2 was formed by plasma spraying. At this time, the thermal spraying was performed in a nitrogen gas atmosphere, and the thermal spraying conditions were: distance between the thermal spray gun electrode and the door panel to be treated = 801 mm to 120 mm, flow rate of barium titanate powder: 30 g/min to 150 g/min. Minutes, power supply: 500A×
I went at 70v.

Subsequently, on this barium titanate layer 2, aluminum was formed as an external electrode to a thickness of 20 μm by vacuum evaporation to obtain an aluminum layer (electrode layer) 3.

Next, the door panel 1 was heated to 100° C., and a voltage of 1.5 KV to 5 KV was applied for 30 minutes in a nitrogen gas atmosphere to perform polarization treatment. Thereafter, a lead wire 4 was drawn out from the aluminum layer 3 and the door panel 1 and connected to a DC power source 5.

The door panel thus obtained was assembled into a car, and the lead wire was connected to a battery as a DC power source. When the vehicle was running at approximately 60 km/h and the switch was turned on to apply a voltage of approximately 1.5V to the piezoelectric material, vibrations from the door panel were significantly reduced.

Although specific embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, but includes various embodiments within the scope of the claims.

For example, in the embodiment, the present invention was applied to a door panel, but it can also be applied to other automobile components.

Furthermore, although the embodiment shows an example in which the piezoelectric material layer is provided on the inner surface of the door panel, it can also be provided on the outer surface and painted thereon.

In addition, although the example uses specific piezoelectric materials and electrode materials, it is of course possible to select other materials depending on the frequency to be canceled.

Further, in the embodiment, an example was shown in which the door panel is coated with one type of piezoelectric material, but it may be used in combination with a plurality of other piezoelectric materials.

In addition, when many types of vibrations are generated by an automobile component, multiple pieces of piezoelectric material with different frequencies to cancel each other are formed at appropriate locations on the automobile component so that they do not come into contact with each other. You can also use it properly.

Furthermore, although the example shows an example in which a switch is used to apply voltage to the piezoelectric material layer, a computer (microcomputer) is used to automatically apply voltage to the piezoelectric material layer by detecting that a specific vibration occurs in an automobile component. It is also possible to apply a voltage directly.

〔Effect of the invention〕

As described above, according to the method for preventing vibrations of automobile component parts of the present invention, the following effects are achieved.

(a) Since the piezoelectric material and electrode used in the present invention only need to be formed thinly on automobile components, it is possible to achieve significant weight and space savings compared to conventional methods.

(b) By selecting piezoelectric materials according to the type of automobile component parts, it is possible to reduce vibrations in all parts.

(c) When piezoelectric materials and electrodes are formed by thermal spraying or vacuum film formation, durability can be improved because of good adhesion to automobile component substrates.

(d) Since the piezoelectric material is a ceramic, it covers and protects the main body of the automobile component to prevent the occurrence of rust. Therefore, the durability of the automobile component itself is also improved.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a main part showing a state in which a method for preventing vibration of automobile components according to an embodiment of the present invention is applied to a door panel. 1--- Door panel (automobile component) 2------
Barium monotitanate N (piezoelectric material layer) 3-m-aluminum layer (electrode layer) 4--Lead wire 5---1 DC power supply

Claims (1)

[Claims] (1) After forming a piezoelectric material layer made of titanate, niobate, etc. on at least a part of an automobile component for preventing vibration, and further forming an electrode layer on this piezoelectric material layer, Automotive components and electrodes are connected to a DC power source via lead wires, and when the vehicle is running, a predetermined voltage is applied from the DC power source to apply a frequency that cancels out the vibrations applied to the automobile components. Features: A method for preventing vibration of automotive components.