JPH10311314A - Spring piece for fixing between members - Google Patents

Abstract

(57) [Problem] To provide a spring piece for fixing between members which can surely fix the members and which is not likely to rotate, shift or slip off due to vibration, impact, or the like. SOLUTION: A fixing spring piece 3 is formed in an N shape by bending a band-shaped leaf spring material in a zigzag manner so that bending directions are alternately opposite to each other.
2 into the gap. One end of the fixing spring piece 3 is engaged with the locking portion 5 of the first member 1, and the other end 3 b is engaged with the lower end of the spring piece locking groove 6 of the second member 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spring piece for fixing a member or part to another member or part using the elasticity of the material itself.

[0002]

2. Description of the Related Art Conventionally, a spring pin of JIS B2808 has been known as one of fixing means used for fixing a member to another member. This spring pin is formed in a cylindrical body having a partially open peripheral surface by a leaf spring material, and both ends are tapered and reduced in diameter. Such a spring pin is reduced in diameter by being press-fitted into a gap between two members, and presses and fixes one member against the other member by its elastic force.

[0003]

However, since the conventional spring pin is formed in a tubular body and is basically fixed by the frictional force between the pin and the member, the gap between the members changes due to vibration, impact, and the like. Then, there is a problem in that it is likely to rotate or shift, and in the worst case, it falls out of the gap.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and it is an object of the present invention to be able to securely fix members with a simple structure and to be able to rotate with respect to vibration, impact, etc. An object of the present invention is to provide a spring piece for fixing between members which is not likely to shift or come off.

[0005]

In order to achieve the above-mentioned object, a spring piece for fixing between members according to the present invention is a spring piece for fixing between two members by being interposed between two members. The belt-shaped leaf spring material is bent in a zigzag manner so that the bending directions are alternately opposite, and the shape in side view is N so that one end engages with one member and the other end engages with the other member. It is characterized by being formed in a character shape.

The fixing spring piece is bent in a zigzag manner using a leaf spring material, and one end engages with one member and the other end engages with the other member. Nothing to do. In addition, the two members are urged in opposite directions so that they are securely fixed.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings. FIG. 1 is a cross-sectional view showing a usage form of a fixing spring piece according to the present invention, FIG. 2 is a plan view, and FIG. 3 is a perspective view of the fixing spring piece. In these figures, 1 is a first member, 2 is a second member, and 3 is a fixing spring piece for fixing the second member 2 in the first member 1. The first member 1 is formed in a bottomed cylindrical body and has a cylindrical storage recess 4 on the upper surface, and three engagement members for engaging the upper end of the fixing spring piece 3 above the inner wall surface 4a. Stop portions 5 are formed at equal intervals in the circumferential direction. This locking part 5
It is constituted by an arc-shaped groove formed in the circumferential direction of the inner wall surface 4a. Although the example in which three locking portions 5 are provided is shown, the number is arbitrary. For example, in the case of one, the second member 2
Can be pressed against the inner wall surface of the storage recess 4 and the three cases have the advantage that the centers of the first and second members 1 and 2 can be aligned with each other. Further, the shape of the groove is not limited to the arc shape, but may be an appropriate shape such as a V shape, a U shape, and a rectangle.

The second member 2 is formed in a cylindrical body, and has three spring piece locking grooves 6 on its outer peripheral surface into which the fixing spring pieces 3 are inserted, at equal intervals in the circumferential direction. Have been. This groove 6 is formed in the axial direction of the second member 2,
The upper end is open to the upper surface of the second member 2, and the lower end extends to near the lower surface.

The fixing spring piece 3 is formed by bending a band-shaped leaf spring material having an appropriate width and length in a zigzag manner so that the bending directions are alternately opposite. In this case, in the present embodiment, the fixing spring piece 3 formed into an N-shape in side view by bending twice is shown. However, as shown in FIG. Two may be provided. In addition, an edge 7 may be provided at the tip as shown in FIG. 3B in order to make it easier to bite into the first and second members 1 and 2.

In order to fix the second member 2 to the first member 1 by the fixing spring piece 3, first, the fixing spring piece 3 is mounted in each groove 6. At this time, the fixing spring piece 3 is mounted with the upper end 3a facing outward and the lower end 3b facing inward. next,
In this state, the second member 2 is inserted into the storage recess 4 of the first member 1. In this case, the inner wall surface 4a of the storage recess 4 and the groove 6
The thickness T of the fixing spring piece 3 in the natural state where the gap D is
If it is set smaller, the fixing spring piece 3 extends in the length direction and is compressed in the thickness direction, so that the resilient force holds the second member 2. Therefore, the second member 2 is fixed in the storage recess 4. When the second member 2 is stored in the storage recess 4, the lower end 3 b of the fixing spring piece 3
The upper end 3a engages with the locking portion 5 and urges upward, so that the second member 2 is securely fixed in the storage recess 4 and the second member 2 is pressed downward. The member 2 and the fixing spring piece 3 do not come off upward. Also, the fixing spring piece 3
Is prevented from moving in the circumferential direction by the groove 6. Further, since the fixing spring piece 3 is bent and formed in a zigzag shape and is N-shaped in a side view, it does not rotate like a conventional spring pin formed of a cylindrical body. When three fixing spring pieces 3 having the same spring constant and structure are used, the centers of the first member 1 and the second member 2 can be matched.

FIG. 5 is a sectional view showing an embodiment in which the fixing spring piece according to the present invention is applied to a pressure detecting device. The pressure detecting device 11 is provided with a storage recess 13 at the center of the upper surface of a package 12 formed of a metal such as SUS316, and stores the pressure sensor 15 and the oil spacer 16 in the storage recess 13 via a base 14. The storage recess 13 is liquid-tightly sealed by the seal diaphragm 17.

The oil spacer 16 is used to reduce the amount of the sealing liquid 18 and to prevent expansion due to heat as much as possible. The oil spacer 16 is usually made of ceramics such as alumina, a synthetic resin, or the like, and is mounted on the base 14. It is pressed against the inner wall surface of the housing recess 13 by being urged in the radial direction by the fixing spring piece 3 described above. Therefore, a groove 19 is formed on the outer peripheral surface of the oil spacer 16, and a locking portion 20 is formed on the inner wall surface of the storage recess 13. A housing 21 for housing the pressure sensor 15 and one end of the lead pin 25 is formed inside the oil spacer 16, and the measured pressure P1 applied to the seal diaphragm 17 is stored in the housing 21 in the pressure sensor. 1
5 is sealed. As the filling liquid 18, silicone oil or the like having a small coefficient of thermal expansion is used. Then, on the upper surface of the oil spacer 16,
A pressure inlet 23 is formed to communicate the pressure measuring chamber 22 formed between the seal diaphragm 17 and the oil spacer 16 with the housing 21. The pressure measuring chamber 22
And the storage section 21 communicate with each other via a gap between the package 12 and the oil spacer 16, so that the pressure introduction port 23 is not always necessary.

The pressure sensor 15 has a sensor chip in which a gauge acting as a piezoresistive region is formed on the surface of a strained portion of a semiconductor substrate by an impurity diffusion or ion implantation technique. Anodically bonded. The base 24 has a thermal expansion coefficient close to the thermal expansion coefficient of the sensor chip, because when thermal distortion when the sensor chip is bonded is transmitted to the sensor chip, the temperature characteristic of the pressure detecting device 11 is reduced and a zero point shift is caused. , Such as Pyrex glass and ceramics.

The base 14 has excellent corrosion resistance and weldability,
The pedestal 24 is formed of a material having a thermal expansion coefficient substantially equal to that of the pedestal 24, for example, Kovar, and a lead pin 25 is provided therethrough. The insertion hole 26 of the base 14 through which the lead pin 25 penetrates is provided with the sealing material 2 to electrically insulate the base 14 from the lead pin 25 and prevent leakage of the liquid 18.
7, hermetically sealed. Such a base 14 is usually welded to the package 12 by projection welding in order to prevent leakage of the liquid 18. Therefore, an annular projection 29 (projection welded portion) is integrally provided near the outer periphery of the lower surface of the base 14, and the projection welded portion 29 is welded to the inner bottom surface of the storage recess 13. Projection welding is a process in which a projection (also referred to as projection or embossing) is formed on a workpiece, or a projection or an edge that is present at the time of processing the workpiece is used. This is a method of welding in an extremely short time, which is different from normal welding in that welding is performed while applying pressure.

In such a configuration, when the fluid to be measured is guided to the seal diaphragm 17, the seal diaphragm 17 is displaced in accordance with the pressure P1. The strain P of the sensor 15 is displaced, and the amount of strain is converted into an electric signal and taken out, thereby detecting the pressure P1. Reference numeral 30 denotes a sealing ball that seals the liquid filling hole 31 of the package 12, 32 is a set screw, 33 is a welding ring of the seal diaphragm 17, and 34 is a gold wire that electrically connects the pressure sensor 15 and the lead pin 25. It is.

The pressure detecting device 11 having such a configuration
Also, since the fixing spring piece 3 is used, the oil spacer 16 can be securely fixed in the package 12.

[0017]

As described above, in the spring piece for fixing between members according to the present invention, since it is bent and formed in a zigzag manner by a band-shaped leaf spring material, the conventional spring pin formed in a cylindrical shape is used. It is easier to manufacture than
Further, when press-fitted between the two members, they can be securely fixed without rotating or moving due to vibration, impact or the like.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a usage form of a fixing spring piece according to the present invention.

FIG. 2 is a plan view.

FIG. 3 is a perspective view of a fixing spring piece.

FIGS. 4A and 4B are perspective views showing another embodiment of a fixing spring piece.

FIG. 5 is a sectional view showing an example in which the present invention is applied to a pressure detecting device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... 1st member, 2 ... 2nd member, 3 ... Fixing spring piece,
4 ... storage recess, 5 ... locking part, 6 ... groove for engaging spring piece, 7
... edge part.

Claims (1)

[Claims] 1. A spring piece for fixing a member between two members by interposing the member between two members, wherein a band-shaped leaf spring material is bent in a zigzag manner so that bending directions are alternately opposite to each other, and one end thereof is provided. A spring piece for fixing between members, wherein a side view shape is formed into an N-shape such that a member engages with one member and the other end engages with the other member.