JPH0632625Y2 - 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 is not damaged even when a large acceleration is applied and has improved impact resistance. Is.

[Prior art and problems to be solved]

In general, an acceleration sensor is configured as shown in FIG. 3, and has a main body 13 that is attached to a moving body on which acceleration acts and that includes a main frame 11 and a case 12, and inside the main body 13. Formed, oil 1
A weight 16 provided in a space 15 filled with the weight 4 and the body 13 for attaching the weight 16 to the body 13.
And a spring plate 18 attached between the weight 16 and the weight 16 by a pin 17, and the strain of the spring plate 18 generated when acceleration is applied is taken out as a strain output of a strain gauge provided on the spring plate 18. What to measure and the weight 1
There is a type in which a displacement gauge is attached to the tip of the displacement gauge 6 and the displacement of the weight 16 caused by the action of acceleration is taken out and measured as the displacement output of the displacement gauge.

And in any case, the acceleration can be measured when the acceleration is not so large, but when the acceleration is excessive, the spring plate is permanently deformed. However, there is a problem that the 0 value is deviated and it becomes impossible to use as an acceleration sensor.

That is, the weight 16 supported by the spring plate 18 arranged inside the space 15 of the main body 11 has its outer surface largely separated from the inner surface of the space 15, and thus the spring plate 1
When a force in the direction of compressing 8 is applied, the outer surface of the weight 16 on which the spring plate 18 is attached comes into contact with the inner surface of the cavity 15 opposite to it, which causes the spring plate 18 to deform. In some cases, it became impossible to use it as an acceleration sensor.

The present invention solves the above-mentioned problems of the conventional one, and eliminates the possibility of permanent deformation of the spring plate even when a large acceleration acts, thereby constantly measuring the acceleration. An object of the present invention is to provide an acceleration sensor that can be used.

[Means for Solving the Problems]

In order to achieve the above object, the present invention provides a polyhedron weight via a flexible member in a space formed inside a main body and filled with oil to be displaceable. An acceleration sensor adapted to detect the amount of flexure of a flexible member or the acceleration applied by the amount of displacement of the weight,
Of the surfaces forming the void, the surface on which the flexible member is attached is a curved surface that curves in the displacement direction of the weight, and the surface of the weight that faces the curved surface is the curved surface. The method adopts a curved surface having the same or a small curvature.

[Action]

According to the present invention, by adopting the above means, when a large force in the direction of compressing the spring plate acts, the spring plate is curved so that the curved surface of the weight and the curved surface of the space are adjacent to each other. Since the spring plate comes into contact with the spring plate before it is deformed and further displacement is prevented, there is no risk of permanent deformation, and the curved portion of the weight and the curved portion of the void have the same curvature. Therefore, the weight can be displaced in the direction orthogonal to the spring plate even in the abutting state.

〔Example〕

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

1 and 2 show an embodiment of an acceleration sensor according to the present invention, in which a main body 3 including a main frame 1 and a case 2 is formed, and an oil 4 is filled inside the main body 3. A polyhedron weight 6 provided in the empty space 5 is attached with a pin 7 between the main body 3 and the weight 6 for attaching the weight 6 to the main body 3, and the central portion is curved. And a spring plate 8.

The weight 6 is supported by the spring plate 8 in a state where the distance between the outer surface of the weight 6 and the inner surface of the space 5 is very close to that of the conventional one, and the weight 6 traverses the acting direction of acceleration. The surface in the direction is a tapered surface 6a, and the surface on the side where the spring plate 8 is attached is
The curved surface 6b is curved in the direction of acceleration.

On the other hand, one surface of the weight 6 that faces the curved surface 6b and forms the void 5 is curved with the same curvature as the curved surface 6b to form a curved surface 5a.

When an excessive acceleration is applied, the weight 6
While displacing the spring plate 8, the tapered surface 6a comes into contact with the inner surface of the space 5, and the spring plate 8 is prevented from further displacement, and in this state, the spring plate 8 is still permanent. Since the amount of deformation does not change, the acceleration can be repeatedly measured.

Therefore, the amount of strain of the spring plate 8 can be measured by a strain gauge within a range in which the weight 6 does not come into contact with the inner surface of the space 5, or a displacement gauge is attached to the weight 6 to displace the weight 6. The acceleration can be measured by measuring the displacement output of the displacement meter.

Then, when a force in the direction of compressing the spring plate 8 is applied, the spring plate 8 is curved and the curved surface 5a of the space 5 in which the spring plate 8 is provided and the curved surface 5a. The curved surface 6b of the weight 6 which opposes will contact.

In this case, the curved portion 6b of the weight 6 and the curved surface 5a of the space 5 have the same curvature, and the spring plate 8
Since the central portion of the spring is curved, when a force is applied to the weight 6 in the direction of bringing the curved surface 6b into contact with the curved surface 5a of the space 5 during acceleration, the spring plate 8
Since the central part of the
The curved surface 5a of the space 5 and the curved surface 6b of the weight 6 come into contact with each other, and thus the spring plate 8 is prevented from being bent further, and therefore, the spring plate 8 is prevented from being damaged. It

Moreover, since the curved surface 5a of the space 5 and the curved surface 6b of the weight 6 have the same curvature even while such a force is being applied, the spring plate 8 can be displaced and the acceleration Is something that can be measured.

When the tapered surface 6a of the weight 6 comes into contact with the inner surface of the space 5 due to an excessive acceleration, first, the portion close to the spring plate 8 comes into contact, and thereafter, the abutted portion serves as a fulcrum. As a result, the contacting portion is enlarged while rotating.

For this reason, the spring plate 8 is acted upon by a bending force and is unlikely to be permanently deformed. Even if an excessive acceleration is instantaneously applied, the spring plate 8 is surely prevented from being damaged and the impact resistance is remarkably improved. It can be increased.

In the above embodiment, the outer surface of the weight 6 is replaced by the spring plate 8
The case where the taper surface 6a is formed so as to be sequentially separated from the inner surface of the cavity 5 as it is separated from is described, but the invention is not limited to this, and the inner surface of the space 5 may be formed into a taper surface. Of course good things.

Further, in the above-described embodiment, the case where the two spring plates 8 are arranged in parallel has been described, but by doing so, the twisting of the weight 6 can be prevented, and further, the spring plate 8 Although the central portion is curved, a flat spring plate may be used, and the same effect can be obtained even if the curvature of the curved surface 6b of the weight is smaller than that of the curved surface 5a. is there.

[Effect of device]

According to the present invention, the structure as described above allows the inner surface of the cavity and the outer surface of the weight to come into contact with each other even if the force in the direction of compressing the flexible member supporting the weight in the cavity of the main body acts. There is no risk of permanent deformation of the flexible member because the weight does not move further upon contact, and even in this state, the weight can be displaced, thereby significantly improving impact resistance. It has excellent effects such as being able to.

[Brief description of drawings]

1 is a schematic sectional view showing an embodiment of an acceleration sensor according to the present invention, FIG. 2 is a sectional view taken along line II-II of FIG. 1, and FIG. 3 is a schematic sectional view showing a conventional acceleration sensor. It is a figure. 1, 11 ...... Main frame 2, 12 ...... Case 3, 13 ...... Main body 4, 14 ...... Oil 5,15 ...... Space 5a, 6b ...... Curved surface 6, 16 ...... Weight 6a ...... Tapered surface 7, 17 ... pin 8, 18 ... spring plate

Claims (1)

[Scope of utility model registration request] 1. A polyhedral weight (6) is disposed via a flexible member (8) in a space (5) formed inside a main body (3) and filled with oil (4). An accelerating sensor capable of displacing the flexible member (8) or an acceleration acting on the amount of deflection of the flexible member (8) or the amount of displacement of the weight (6). Of the surfaces to be formed, the surface on which the flexible member (8) is attached is a curved surface (5a) that curves in the displacement direction of the weight (6), and the surface facing the curved surface (5a) is formed. An acceleration sensor, wherein the surface of the weight (6) is a curved surface (6b) having the same curvature as or a smaller curvature than the curved surface (5a).