JPH044193Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a piezoelectric shiatsu gauge used to measure the internal cylinder pressure of an engine, that is, a shiatsu chart, and particularly relates to a seal structure of the piezoelectric shiatsu gauge. be.

[Prior art]

An example of a conventionally used piezoelectric acupressure meter is shown in Fig. 1. In the figure, numeral 1 is a cylindrical sleeve as a case made of metal such as stainless steel, and the inner circumference of the bottom 1a is A plate-shaped pressure receiving part 2 made of the same material is attached to the surface. Further, a cylindrical insulating member (not shown) is interposed on the inner surface of the sleeve 1, and plate-shaped piezoelectric elements 3a to 3c made of crystal pieces are provided on the upper surface of the pressure receiving part 2, an acceleration correction mass 4 serving as an electrode, and a hole. Acceleration correction piezoelectric elements 5 made of crystal pieces are sequentially stacked and housed, and these piezoelectric elements 3a to 3c, acceleration correction mass 4, and acceleration correction piezoelectric element 5 constitute a charge generation section 6.

A cylindrical bushing member 7 made of stainless steel and having a through hole 8 is attached to the upper opening 1b of the sleeve 1 in close contact with the acceleration correction piezoelectric element. Part 9 has been applied. A lower insulator 10 made of an insulating material is inserted into the cylindrical space 9 of the bushing member 7, and the body 11 of the lower insulator 10 is fitted into the through hole 8 and the head 1
2 is mounted in contact with the side surface of the cylindrical space 9. Further, a recess 13 is formed in the head 12 of the lower insulator 10, and a lower end portion of a terminal 16 is inserted into the recess 13. This terminal 16 connects a lead wire 19 connected to the acceleration correction mass 4 serving as one electrode to the through hole 1 in the lower insulator 10 in order to take out the charge generated in the charge generating section 6 as an output.
It is electrically connected through 4. Then, the collar portion 17 of the terminal 16 and the bushing member 7
A seal member 20 is interposed between the side surface of the cylindrical space 9 of the terminal 16 and the body 18 of the terminal 16.
By attaching an insulator 15 made of an insulating material to the terminal and curling the tip of the bushing member 7, the sealing member 20 seals the bushing member 7 and the terminal 16, thereby sealing the charge generating portion 6. Configured to seal.

In addition, in the charge generation section 6, the laminated piezoelectric elements 3a to 3c and the acceleration correction piezoelectric element 5 are connected to each other through an acceleration correction mass 4 so as to cancel out the electrodes generated by inertial force due to acceleration. The electric charge of the electric charge generating section 6 is taken out as an output between the terminal 16 led out from the acceleration correction mass 6 via a lead wire 19 and the sleeve 1.

By the way, such piezoelectric type acupressure type is used in the high temperature corrosive atmosphere inside the engine, and because the generated electric charge is small, high insulation resistance is required, so due to its structure, it is difficult to generate electric charge. Part 6 must be completely sealed. Therefore, in the past, the pressure receiving part 2 - sleeve 1 - bushing member 7
In addition to sealing each joint portion by welding or the like, the terminal 16 from which the charge is taken out and the bushing member 7 are electrically insulated and sealed using a sealing member 20. However, this sealing member 20 requires a special material that can withstand high-temperature corrosive atmospheres and has high insulation resistance, which increases the cost, requires time and effort to fill the sealing member, and makes the seal There were drawbacks such as deterioration of the performance of the shiatsu meter due to a decrease in insulation resistance and sealing performance due to deterioration of the components.

[Purpose of invention]

The present invention was made in view of the above points, and its purpose is to eliminate the need for special sealing members.
Provided is a piezoelectric shiatsumeter that can inexpensively and easily seal a charge generating part by using an elastic insulating material such as Teflon, which electrically insulates between a terminal and a bushing member, as a sealing member. It's about doing.

[Structure of the idea]

In order to achieve this purpose, the present invention
A case 1 that houses a charge generating section 6 made of a piezoelectric element, and a cylindrical bushing member 7 that is attached to the top opening of the case and has a cylindrical space 9 at the top.
and an insulator 10 made of an elastic insulating material and housed in the cylindrical space in contact with the bottom surface thereof.
and a terminal 16 which is housed in the cylindrical space in contact with the top surface of the insulator and from which the charge of the charge generation section is taken out as an output, and at least one of the contact surface with the bottom surface of the cylindrical space of the insulator and the contact surface with the terminal. At the contact surface,
By forming tapered seal structures 25 to 32 and curling the upper tip of the bushing member, the joint portions of the insulator, the terminal, and the bushing member are crimped, and the insulator connects the terminal and the bushing member. The charge generating section is electrically insulated and sealed. Embodiments of the present invention will be described below with reference to the drawings.

〔Example〕

Figures 2a and b are a main cross-sectional view before sealing and a partially cutaway cross-sectional view after sealing, showing an embodiment of the piezoelectric shiatsumeter according to the present invention, and these figures are the same as or equivalent to Figure 1. The parts are given the same reference numerals and the explanation thereof will be omitted. In this embodiment, Teflon is used as the lower insulator 10 and upper insulator 15 that electrically insulate between the bushing member 7 and the terminal 16, and the bushing member 7 is
The lower insulator 10 in the cylindrical space 9 of
A tapered portion 25 is provided at the portion that joins with the bottom surface of the head 12.
At the same time, a tapered part 26 is provided at the bottom of the collar part 17 of the terminal 16 at the part that joins with the lower insulator 10 (see FIG. 2a), and when curling the upper end of the bushing member 7, each of the tapers The charge generating section 6 is sealed by the lower insulator 10 by crimping the tips of the sections 25 and 26 to the upper and lower surfaces of the lower insulator 10, respectively, as shown in FIG. 2b. This is how it was done.

According to the seal structure of the above embodiment, the Teflon used for the lower insulator 10 and the upper insulator 15 has high elasticity and insulating properties, and has a function as a seal packing. High electrical insulation can be obtained without using such special sealing members.
Further, by eliminating the need for a seal member, the number of man-hours is eliminated, costs are reduced, and there are advantages such as no deterioration of the characteristics of the shiatsu meter due to deterioration of the seal member.

FIG. 3 is a partially cutaway sectional view corresponding to FIG. 2a showing another embodiment of the present invention. The difference from FIG. 2 is that tapered portions 27 and 28 are provided on the upper and lower surfaces of the head 12 of the lower insulator 10, respectively, and when the upper end of the bushing member 7 is curled, the lower insulator 10 The respective taper portions 27 and 28 of the bushing member 7 and the terminal 1
In this embodiment, the same effect as described above can be obtained.

FIG. 4 is a partially cutaway sectional view corresponding to FIG. 2a showing another embodiment of the present invention, and the difference from FIG. By providing a protrusion 29 on the bottom surface of the head 12 of the terminal 10 and a protrusion 30 on the bottom surface of the collar 17 of the terminal 16, It can also be sealed in a manner similar to the embodiments described above.

FIG. 5 shows still another embodiment of the present invention, and the difference from FIG. 2 is that the insulator 10
By providing protrusions 31 and 32 on the outer and inner peripheries of the upper and lower surfaces of the head 12, respectively, sealing can be achieved in the same manner as in the above embodiment.

In addition, in the above-mentioned embodiment, the case where Teflon was used as the lower insulator and the upper insulator was shown, but the present invention is not limited to this.
Of course, sealing can be achieved by using an elastic insulating material with excellent heat resistance and sealing properties, or by using any combination of crimp structures between the lower insulator, terminal, and bushing member.

[Effect of idea]

As explained above, according to the piezoelectric shiatsumeter of the present invention, the elastic insulating member such as Teflon, which electrically insulates between the terminal and the bushing member, is also used as a sealing member.
This eliminates the need for special and expensive sealing members, and provides high insulation properties. Furthermore, since a tapered seal structure is formed on the contact surface of the insulating member, the sealing characteristics are significantly improved. Moreover, there are excellent effects such as reduction in man-hours and cost, and no deterioration in the characteristics of the shiatsu meter due to deterioration of the sealing member.

[Brief explanation of drawings]

FIG. 1 is a main sectional view showing an example of a conventional piezoelectric shiatsu meter, and FIGS. 2 a and b are main sectional views before sealing and after the sealing, showing an embodiment of the piezoelectric shiatsu meter according to the present invention. Partially cutaway sectional views, FIGS. 3 to 5 are FIG. 2a showing other embodiments of the present invention.
It is a corresponding partially cutaway sectional view. 1...Sleeve (case), 2...Pressure receiving part, 6
. . . Charge generation portion, 7 . . . Bush member, 8 . Terminal, 17...Tsubabe,
19... Lead wire, 25, 26, 27, 28...
Tapered portion, 29, 30, 31, 32... protrusion.

Claims (1)

[Scope of Claim for Utility Model Registration] A case housing a charge generating section made of a piezoelectric element, a cylindrical bushing member attached to the top opening of the case and having a cylindrical space at the top, and the bushing. An insulator made of an elastic insulating material is stored in the cylindrical space of the member in contact with the bottom surface thereof, and an insulator is also stored in the cylindrical space of the bushing member in contact with the top surface of the insulator, and the electric charge of the charge generation part is used as output. a terminal to be taken out, forming a tapered seal structure on at least one of the contact surface with the bottom surface of the cylindrical space of the insulator and the contact surface with the terminal, and curling the upper tip of the bushing member. The piezoelectric acupressure device is characterized in that the insulator is crimped at each joint between the terminal and the bushing member, the insulator electrically insulates the terminal and the bushing member, and seals the charge generating part. Total.