JPS5820886Y2 - displacement meter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for measuring mechanical displacements or loads.

In particular, the present invention relates to a device suitable for measuring displacement frequency using a displacement meter based on a new principle using internal pressure.

Conventionally, a device as shown in FIG. 1 has been used to measure the displacement or frequency of displacement of a mount rubber for attaching an engine to a chassis.

That is, 1 is an engine, 2 is a chassis frame, and 3 is a mount rubber. One end of a wire 4 is fixed at a suitable position on the engine mounting part, and the other end of the wire 4 is connected to a tension meter 6 using a pulley 5. It is connected to.

When the mount rubber 3 is displaced due to the vibration of the engine 1, this appears on the tension meter 6 as a change in the tension of the wire 4.

Such a device has the disadvantage that when the rate of change in displacement becomes large, the measurement cannot be tracked sufficiently, and there is a noise factor between the chassis frame 2 and the fixed point of the displacement meter 6, which prevents accurate measurement. Ta.

The present invention is an improvement on this, and aims to provide a displacement meter that has a high follow-up speed, has a simple device configuration, and has good measurement accuracy.

The present invention involves inserting a balloon filled with a fluid between the object whose mechanical displacement is to be measured and a member that fixedly supports the object, and measuring the pressure of the fluid inside the balloon. It is characterized by a structure that detects by electric means.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 is an explanatory diagram of the usage state of the device according to the present invention.

Engine 1 is mounted on chassis frame 2, and mount rubber 3
It is installed by

An angle 10 is fixed to the chassis frame 2, and a detection section 11 of the device according to the present invention is inserted into a gap between the angle 10 and the engine fixing section.

FIG. 3 is a structural diagram of the detection section of the device according to the embodiment of the present invention.

Reference numeral 12 constitutes a balloon made of a rubber film, and the inside thereof is filled with air.

Reference numeral 14 denotes a strain gauge, which generates strain due to the air pressure inside the balloon, and electrically detects the strain as a change in resistance value.

16 is a valve (belly button) for adjusting the air pressure inside the balloon.

In a device having such a structure, a mechanical change occurring in the mount rubber 3 is detected as a pressure change in the air inside the balloon of the detection unit 11, and this is taken out from the strain gauge 14 as an electrical signal.

FIG. 4 is a block diagram for processing this electrical signal.

A change in resistance value occurring in the strain gauge 14 is detected by a known strain gauge measuring device 18.

A counter 20 is connected to the recorder output terminal via a limiter 19.

According to such a configuration, the mechanical strain generated in the strain gauge 14 is displayed on the measuring device 18, and when the value exceeds a certain value set in the limiter 19, the number of times the mechanical strain occurs is counted by the counter 20.

FIG. 5 is a schematic diagram of another electrical means for detecting pressure changes within the balloon.

In this example, a condenser microphone 14' is used in place of the strain gauge 14 of the previous example.

The capacitance change occurring in the capacitor microphone 14' is converted into a change in voltage signal by a capacitance voltage conversion circuit 22, and is amplified by a DC amplifier 23.

In such a device, the mechanical displacement to be measured is directly replaced by a pressure change within the balloon, with few intervening elements, so tracking is fast and noise is low.

Moreover, since this balloon internal pressure is detected by electrical means, it is possible to select and set the optimum means depending on the required magnitude of change or rate of change (frequency).

If the detection balloon according to the present invention is made small, it can be used in extremely narrow spaces, and the frequency that can be tracked becomes high.

The device of the present invention converts mechanical displacement into pressure changes using pistons and cylinders, and compared to devices that measure this pressure, the valve is inexpensive, making it economical. Since it can also be formed into any shape, desired measurements can be carried out even when the shape of the measurement portion is complex or narrow.

Furthermore, there is no need for fixed brackets for mounting the piston and cylinder, and the direction of displacement to be measured is not limited to surrounding conditions.

The device of the present invention is extremely useful for measuring displacements in the engine compartment of a motor vehicle, where there is little space for arranging a measuring device.

In the above example, air is introduced into the balloon, but the present invention can be similarly implemented using other gases or liquids such as water.

Although the above example of use concerns engine mounting displacements, a variety of mechanical displacements or loads can be measured with the device of the present invention.

[Brief explanation of drawings]

Figure 1 is a configuration diagram of a conventional displacement measurement example, Figure 2 is a configuration diagram of an example of wheat crop measurement according to the present invention, Figure 3 is a diagram showing an example of the structure of the detection section, and Figures 4 and 5 are pressure detection. The figure which shows the example of a structure of the electric means to which 1...Engine, 2...Chassis frame, 3...Mount rubber, 4...
Wire, 5... Pulley, 6... Tension meter,
10...angle, 11...detection section,
12...Rubber film, 14...Strain gauge, 14'...Condenser microphone, 18...
...Strain gauge measuring device, 19...Limiter,
20... Counter, 22... Capacity voltage conversion circuit, 23... DC amplifier.

Claims (3)

[Scope of utility model registration request] (1) A rubber balloon filled with a fluid is inserted between the object whose mechanical displacement is to be measured and a member that fixedly supports the object, and the pressure of the fluid is detected. Displacement meter with electrical means. (2) The displacement meter according to claim (1), wherein the electric means includes a strain gauge attached to a portion that is deformed by the pressure of the fluid in the balloon. (3) The displacement meter according to claim (1), wherein the electric means includes a condenser microphone whose capacitance changes depending on the pressure of the fluid in the balloon.