JPH0710298Y2 - Accelerometer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an acceleration sensor, and more particularly to an acceleration sensor that can be lightened as a whole and can be improved in workability.

[Prior art and problems to be solved]

Generally, in an acceleration sensor using a strain gauge, its cross section is configured as shown in FIG. 6, and a weight 16 is provided at the tip between the upper surface of the main holder 11 and the lower surface of the sub holder 12. After the rear end of the strain plate 13 is clamped, it is fixed by a screw 14 penetrating them, and in order to reduce the temperature dependence, the sub holder 12
The main holder 11 is made of the same material as the strain plate 13, or is made of a material having a small difference in linear expansion coefficient from the strain plate 13.

Since the strain plate 13 is made of a material having a large fatigue limit such as stainless steel, the main holder 11
Since it itself uses the same material, it has problems that it is not easy to work and that it cannot be made lightweight.

The present invention solves the above-mentioned problems of the conventional ones, and an object thereof is to provide an acceleration sensor that can be lightened as a whole and can be improved in workability.

[Means for solving problems]

In order to solve the above problems, the present invention provides a main holder, a spacer made of a material different from that of the main holder fixed to the main holder, and a spacer made of the same material as the spacer fixed to the spacer by a pair of tightening means. A sub holder, a strain plate made of the same material as the spacer, one end of which is sandwiched and fixed between the sub holder and the spacer, and a weight is provided at the other end, and a strain provided on the strain plate. It is the one that employs a means including a gauge.

[Action]

This invention adopts the above-mentioned means and divides the main holder into two members, that is, the main holder and the spacer made of a different material, and the strain body and the sub holder are made of the same material as the spacer. Since the above is constituted by the two members of the main holder made of aluminum and the spacer made of stainless steel, it is possible to reduce the weight as a whole while keeping the temperature dependency small.

〔Example〕

 An embodiment of the present invention shown in the drawings will be described below.

FIG. 1 to FIG. 3 show an acceleration sensor according to the present invention, in which a pair of opposing standing portions 1a, 1a are provided on the upper surface of the main holder 1 between the standing portions 1a, 1a. Side spacer 4 and two screws 5, 5 penetrating the main holder 1 from the lower surface of the main holder 1.
The spacer 4 is fixed to the main holder 1.

On the other hand, the sub-holder 2 is fixed to the upper surface of the spacer 4 via the two screws 6 and the strain plate 3 is sandwiched and fixed between the spacer 4 and the sub-holder 2.
Fix the weight 7 at the tip of.

In this case, a line A connecting the two screws 5 and 5 fixing the spacer 4 to the main holder 1 and a line B connecting the two screws 6 and 6 fixing the sub holder 2 to the upper surface of the spacer 4. And are orthogonal to each other.

The main holder 1 is made of aluminum, the spacer 4 is made of stainless steel, which is the same material as the strain plate 3, and 10 is a mounting hole for the main holder 1.

In the acceleration sensor configured as described above, when the main holder 1 is attached to the object to be measured as in the conventional one, the main holder 1 and the main holder 1 are screwed through the screws 5 and 5 when the acceleration is applied. The spacer 4 and the sub-holder 2 attached together are moved integrally, and the weight 7 is moved with a delay, so that the strain plate 3 is distorted, and the strain gauge detects the strain amount at this time. It comes to know the acceleration.

If the ambient temperature changes during the above operation,
The main holder 1, the spacer 4, and the sub-holder 2 each perform expansion according to a unique linear expansion coefficient. The spacer 4 is made of the same material as the strain plate 3, and the spacer 4 Since the sub holder 2 and the sub holder 2 are made of the same material as the conventional one in consideration of temperature dependency, the strain plate 3 is sandwiched by the upper surface of the spacer 4 even when the spacer 4 expands and contracts relative to the main holder 1 due to temperature change. Since the distance between the screws 6 for fixing the sub holder 2 does not change, the weight can be reduced as compared with the conventional one while maintaining the conventional temperature dependency.

FIG. 4 and FIG. 5 show another embodiment of the acceleration sensor according to the present invention. The same members as those shown in the above embodiment are designated by the same reference numerals and detailed description thereof will be omitted. .

In this embodiment, one screw 9 is used to fix the main holder 1 and the spacer 4 without using the two screws 5 and 5.

A recess 4a is formed on the lower surface of the spacer 4 in a direction orthogonal to the direction of the line B connecting the screws 6 for fixing the spacer 4 and the sub-holder 2, and the recess 4a is formed. A convex portion 1b which can be located inside is formed on the upper surface of the main holder 1, and the main holder 1 and the spacer 4 are fixed by the screw 9 in a state where the convex portion 1a is combined with the concave portion 4a.

Therefore, the spacer 4 is attached to the main holder 1.
Does not move in the direction orthogonal to the concave portion 4a and the convex portion 1b, that is, in the direction of the line B connecting the screws 6 fixing the sub holder 2 with the strain plate 3 held on the upper surface of the spacer 4. It has become.

Even when configured as described above, the spacer 4 is made of the same material as the strain plate 3 as in the case of the above-described embodiment, and the spacer 4 and the sub-holder 2 are conventional in consideration of temperature dependence. Since the same material as that of the spacer 4 is used, even if the spacer 4 expands and contracts relative to the main holder 1 due to a temperature change, the strain plate 3 is formed on the upper surface of the spacer 4.
Since the distance between the screws 6 for fixing the sub-holder 1 does not change in a state where the sub-holder 1 is sandwiched, the weight can be reduced as compared with the conventional one while maintaining the conventional temperature dependence.

In addition, in both of the above-mentioned embodiments, the screw is used as a means for fixing the space between the main holder 1 and the spacer 4 and the space between the spacer 4 and the sub-holder 2. Is also good.

[Effect of device]

This invention is configured as described above and divides a portion corresponding to the conventional main holder into a main holder and a spacer 2 member made of a different material, and the strain plate and the sub holder for fixing the strain plate are the same as the spacer. Since the material is made of, for example, the main holder is made of aluminum, and the spacer, the strain plate, and the sub-holder are made of stainless steel, the overall weight can be significantly reduced, and the main holder of the spacer can be changed due to temperature change. Even if expansion and contraction occurs relative to the spacer, the distance between the pair of tightening means that fixes the sub-holder while sandwiching the strain plate on the upper surface of the spacer does not change, and the temperature dependence is kept small while the overall weight is light. It has an excellent effect that it can be made into a material.

[Brief description of drawings]

1 to 3 show an embodiment of an acceleration sensor according to the present invention. FIG. 1 is a plan view, FIG. 2 is a sectional view, FIG. 3 is a bottom view, and FIGS. FIG. 4 is a side view, FIG. 5 is a sectional view, and FIG. 6 is a sectional view showing a conventional acceleration sensor. 1, 11 …… Main holder 2,12 …… Sub holder 3,13 …… Distortion plate 4 …… Spacer 5,6,9,14 …… Screw 7,16 …… Weight 10 …… Hole

Claims (1)

[Scope of utility model registration request] 1. A main holder (1), a spacer (4) made of a material different from that of the main holder (1) fixed to the main holder (1), and a pair of tightening means (6) (6).
And a sub-holder (2) made of the same material as the spacer (4) fixed to the spacer (4), and one end of the sub-holder (2) is clamped and fixed between the sub-holder (2) and the spacer (4). Acceleration characterized by comprising a strain plate (3) made of the same material as the spacer (4) provided with a weight (7) at the other end, and a strain gauge provided on the strain plate (3). sensor.