JPH08304168A - Nonresonant knock sensor - Google Patents

Abstract

PURPOSE: To realize one touch joint of an electrode and an output terminal without requiring any soldering by forming the tip of the lead part of output terminal to be inserted into a pushing-in connecting part and fitted to the lead part of electrode plate on the receiving side of the pushing-in connecting part in a housing. CONSTITUTION: The receiving side 4a of the pushing-in connecting part is formed at the tip of lead part of an electrode plate 4 for taking a signal from a piezoelectric element 3. The inserting part 9a of pushing-in connecting part is formed at the tip of an output terminal 9 which is then resin-molded integrally with a socket member 8. In order to constitute the required knock sensor, the piezoelectric element 3, the electrode plate 4 and a weight (mass body) 2 are stacked sequentially in a housing member 1 and tightened at a screw part 5. The inserting part 9a at the pushing-in connecting part of the terminal is then matched with the electrode plate 4 on the side 4a for receiving the pushing-in connecting part. Finally, the member 8 is pushed in to fit the receiving side 4a and the inserting part 9a and to connect them electrically.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a housing member for accommodating a piezoelectric element, a mass body, and an electrode plate for taking out a detection output, which is attached to an object to be measured, and a socket member closely attached to the housing member via an O-ring. Relates to a non-resonant knock sensor.

[0002]

2. Description of the Related Art As a conventional technique of this type, one in which an electrode plate and a terminal are connected by soldering with a connector is disclosed in JP-A-58 / 58
It is disclosed in Japanese Patent No. 124958.

As a typical prior art of the present invention, Japanese Patent Publication No. 4-21824 (hereinafter referred to as Prior Art 1), which is an invention of an acceleration detector, will be described.

In FIG. 3, reference numeral 301 denotes a housing member,
301a is a screw part, 302 is a weight, 303 is a piezoelectric element, 304 is an electrode terminal, 305 is a screw, and 306 and 307.
Is an insulating tube, 308 is a socket member, 308a is a connector portion, 309 is an output terminal, and 310 and 311 are O-rings. Reference numeral 313 denotes a support member, which is the housing member 301.
Between the socket member 308 and the socket member 308, and the electrode terminal 30
4 supports an output terminal 309 connected to No. 4. The piezoelectric element 303, the electrode terminal 304, and the weight 302 are fastened to the housing member 301 with a screw 305, and the detection signal is led to the outside from the electrode terminal 304 via the output terminal 309.

A large opening having a semicircular shape is formed in the supporting member 313, and an opening of the electrode terminal 304 is formed in the opening so as to facilitate connection work between the electrode terminal 304 and the output terminal 309. A tip portion penetrates a hole 314 provided in the output terminal 309 and is exposed. The work of connecting the output terminal 309 to the exposed end by soldering can be easily performed because this portion is largely open to the open end side of the housing member 301. The supporting member 313 having this opening is covered with the housing member 301 and the socket member 308 attached thereto. The socket member 308 is integrated with the housing member 301 by the caulking portion 301b, and the support member 313 is sandwiched between the both.

The O-ring 310 is the housing member 30.
1, the socket member 308 and the support member 313 are accommodated in the gap. Also, the O-ring 311
Is mounted on the outer periphery of the connector portion 308a of the socket member 308, and when the connector portion and the mating external socket (not shown) are fitted, the fitting portion is waterproofed. That is, the mating external socket and the O-ring 3 with the mating external socket attached to the connector portion 308a.
Each of the joint surfaces of 11, the socket member 308, the O-ring 310, and the housing member 301 has a waterproof function, and the waterproof structure of the acceleration detector is completed.

As described above, according to the first prior art, in the acceleration detector, the electrode terminal for taking out the acceleration signal detected by the detecting element and the output terminal for outputting the acceleration signal to the outside are soldered. Since it has an opening and a supporting member for supporting the output terminal, and the supporting member is sandwiched between the housing member and the socket member, the electrode terminal and the output terminal are securely soldered. For electrical and physical connection to
Since the opening is sandwiched between the socket member and the socket member for soldering to seal, the waterproof effect is obtained, the structure and the assembly process are simplified, and the production is dramatically improved.

[0008]

However, in the prior art example 1, the electrode terminal for taking out the signal detected by the detecting element and the output terminal for outputting the signal to the outside have the openings for soldering, Since the support member for supporting the output terminal is provided and the support member is sandwiched between the housing member and the socket member, it is necessary to securely electrically and physically connect the electrode terminal and the output terminal. , Requires soldering work.

An object of the present invention is to perform soldering work in order to securely electrically and physically connect an electrode plate for taking out a signal detected by a detection element and an output terminal for outputting this signal to the outside. In other words, the present invention provides a non-resonant knock sensor that can electrically connect an electrode plate and an output terminal with one touch.

[0010]

A non-resonant knock sensor according to the present invention includes a housing member for accommodating a piezoelectric element, a mass body, and an electrode plate for extracting a detection output, and a housing member attached to an object to be measured. In a non-resonant knock sensor that has a socket member that is closely attached via a ring, the socket member is formed by integrally molding a crank-shaped lead part from a terminal part that becomes an external terminal, and further, the tip of the lead part is press-fitted. Molded to be the insertion portion of the connecting portion, the lead portion of the electrode plate is molded to be the receiving side of the press-fitting connection portion, the press-fitting connection portion is in a fitted state in the housing, At the same time as the detection output is led to the external terminal, the socket member comes into close contact with the O-ring,
The piezoelectric element and the mass body are sealed.

[0011]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a diagram showing an embodiment of the present invention. In FIG. 1, 1 is a housing member, 1a is a screw part, 2 is a weight, 3 is a piezoelectric element, 4 is an electrode plate, 5 is a screw, 7 is an insulating coating, 8 is a socket member, 9 is an output terminal, and 10 is O.
It is a ring.

Here, as shown in FIG. 2A, the electrode plate 4
Is manufactured so as to be the receiving side of the press-fitting connection portion at the tip of the lead of the electrode plate. The insulation coating 7 covers the leads of the electrode plate 4 with insulation. The output terminal 9 is of a crank type, and its tip serves as an insertion portion of the press-fitting connection portion.

2 (b), (c), and (d) are enlarged views of the lead tip portion of the electrode plate 4. As shown in FIG. In FIG. 2B, a brim having holes for receiving a barb is provided on both sides of the electrode lead tip portion, and the brim is bent in a direction perpendicular to the electrode plate lead fitting direction so that the bent cross section becomes rectangular. It was modeled on. In FIG. 2C, a brim having holes for receiving barbs is provided on both sides of the electrode lead tip, and the brim is bent in a direction perpendicular to the electrode plate lead fitting direction. It is shaped like a circle. In FIG. 2 (d), a brim having a groove into which a barb is inserted is provided on both sides of the tip of the electrode lead, and the brim is bent in a direction perpendicular to the fitting direction of the electrode plate. It was modeled to be.

A receiving side 4a for press-fitting connection is formed at the tip of the lead portion of the electrode plate 4 for extracting a signal from the piezoelectric element 3. The output terminal 9 is formed integrally with the socket member 8 by resin after the insertion portion 9a of the press-fitting connection portion is formed at the tip thereof.

The piezoelectric element 3, the electrode plate 4, and the weight (mass body) 2 are sequentially laminated so as to form a required knock sensor, and the screw portion 5 is tightened. Next, the socket member 8 is pushed in such a position that the insertion portion 9a of the press-fit connection portion of the output terminal is aligned with the receiving side 4a of the press-fit connection portion of the electrode plate. At this time, the receiving side 4a of the electrode plate and the insertion portion 9a of the output terminal are
Mated and electrically connected. The press-fitting connection portions 4a and 9a are provided with barbs or the like.

The connection between the lead portion of the electrode plate and the lead portion of the output terminal is a press-fitted connection portion provided with a barb, and once fitted,
It does not come off, and because it is physically connected securely,
The electrical connection is guaranteed.

[0017]

As described above, according to the present invention, the electrode plate and the terminal can be connected with one touch without soldering work.
In addition, since the socket member is integrally molded with resin, it has excellent airtightness, the number of parts can be reduced without the need for connectors, etc., the waterproof effect can be obtained, the structure and assembly process can be simplified, and the production efficiency can be improved. be able to.

[Brief description of drawings]

FIG. 1 is a diagram specifically showing the present embodiment.

FIG. 2 (a) is a view of a connecting part of a press-fitting connection portion. FIG. 2B is an enlarged view of the lead tip portion of the electrode plate. FIG. 2C is an enlarged view of the lead tip portion of the electrode plate. FIG. 2D is an enlarged view of the lead tip portion of the electrode plate.

FIG. 3 is a diagram of a conventional knock sensor.

[Explanation of symbols]

 1. Housing member 2. Weight 3. Piezoelectric element 4. Electrode plate 4a. 4. Receiving side of press-fitting connection part of lead part of electrode plate Screw 7. Insulation coating 8. Socket member 9. Output terminal 9a. Insertion part of the press-fit connection part of the lead part of the output terminal

Claims (1)

[Claims] 1. A non-resonant knock having a housing member for accommodating a piezoelectric element, a mass body, and an electrode plate for extracting a detection output, and having a housing member to be attached to an object to be measured, and a socket member which is in close contact with the housing member via an O-ring. In the sensor, the socket member is integrally formed with a crank-shaped lead portion from a terminal portion that serves as an external terminal, and further, the tip of the lead portion is formed so as to be an insertion portion of the press-fit connection portion,
The lead portion of the electrode plate is molded so as to be the receiving side of the press-fitting connection portion, the press-fitting connection portion is in a fitted state in the housing, and the detection output is led to the external terminal and, at the same time, the socket. A non-resonant knock sensor in which members are in close contact with each other via an O-ring to seal the piezoelectric element, the mass body, and the like.