JPH0647872U - Acceleration detector - Google Patents

Abstract

(57) [Abstract] [Purpose] By providing a case and lid with a structure that allows the magnetic body to be assembled without causing distortion in the magnetic body, and the work of assembling, fixing, and connecting the connection pin terminals is easy. An inexpensive acceleration detector with high reliability is provided. [Structure] A magnetic circuit composed of a reed switch 3 and a magnetic body 6 enclosed in a resin container including a case 1 and a lid 2, and a permanent magnet enclosed in the same container and biased by a coil spring 5. A groove 21 is formed on the outer peripheral surface of the cylindrical portion 26 of the lid 2 portion of the acceleration detector that operates the reed switch 3 when the lead wire 4 moves and approaches.
1 and is provided with a pin receiving base 25 on the front surface of the lid 2, and the pin receiving base 25 corresponds to the small hole 12 into which the connection pin terminal 8 provided in the case 1 is inserted. After the small hole 24 is provided at the position, the lid 2 is assembled to the case 1, the U-shaped pin 81 is passed through the small holes 24 and 12,
An acceleration detector characterized by a structure for fixing and holding the connection pin terminal 8.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an acceleration detector that detects speed changes.

[0002]

[Prior art]

 An acceleration detector that detects an acceleration and generates an electric signal when a certain acceleration is reached is conventionally used as an acceleration detector having a structure whose cross section and assembly process are shown in FIGS. 6, 7, and 8. There is. That is, as shown in FIGS. 6 and 7, the reed switch 3, the permanent magnet 4, and the coil spring 5 are mounted in a tubular case 1 formed of an insulating resin or the like, and the tubular shape of the lid 2 is set. The magnetic body 6 is fitted in the step portion 23 on the outer peripheral surface of the portion 26 in the case 1. On the lower surface of the open end of the case 1, a U-shaped pin 81 for electrical connection and fixing at the time of mounting on a substrate or the like is fixed as a connecting pin terminal 8 through a small hole 12. A fixing pin 9 is planted on the lower surface of the middle part of the case. As shown in FIG. 7, the magnetic body 6 is mounted in the case 1 by fixing one end of the magnetic body to a step portion 23 having a step on the outer peripheral surface of the lid 2. In this case, the position of the magnetic body 6 is determined by bringing the tip end portion 61 of the magnetic body 6 into contact with the stepped portion 11 of the tubular portion inside the case 1. Further, as shown in FIG. 8, the lead 7 of the reed switch 3 is electrically connected to the upper end portion of the connecting pin terminal 8 using the U-shaped pin 81 by a means such as spot welding. The leads 7 of the reed switch 3 are distributed and connected to two terminals, respectively. In this way, by using one signal output terminal as two terminals, electrical reliability and mechanical reliability are improved. The operating principle of this acceleration detector will be briefly described below. Normally, the permanent magnet 4 is normally positioned at the end of the case 1 (in this example, the right end in FIG. 6) by the urging force of the coil spring 5, and Since the magnet 4 is separated from the contact portion of the reed switch 3, the contact of the reed switch 3 is open. Then, when the moving body to which this acceleration detector is fixed stops in the axial direction of the coil spring 5 or slows down, acceleration is applied to the acceleration detector in that direction, and the permanent magnet 4 moves toward the coil spring 5. It moves to the left in FIG. 6 by overcoming the urging force and approaches the contact portion of the reed switch 3, so that the contact of the reed switch 3 is closed and it can be detected that the acceleration exceeds a predetermined value. Here, the magnetic body 6 has a function of holding the moved permanent magnet 4 in the vicinity of the contact portion of the reed switch 3 for a long time by a magnetic attractive force, and can hold the detection state of the acceleration detector. Therefore, the magnitude of acceleration, positive / negative, and presence / absence of a signal can be freely set depending on the position of the reed switch 3, the position of the permanent magnet 4, and the urging state of the coil spring 5. The conventional acceleration detector described above has the following problems. As shown in FIGS. 6 and 7, the magnetic body 6 is assembled and fixed by mounting the magnetic body 6 on the step portion 23 of the outer peripheral surface provided at the end of the tubular portion 26 of the resin lid 2. By setting the lid 2 in the case 1 made of resin, the tip 61 of the magnetic body 6 comes into contact with the step 11 of the case 1 for positioning. When the lid 2 is attached, the tip end portion 61 of the magnetic body 6 has nothing to protect it, so a force due to contact with the step portion 11 or a force due to contact with the inner peripheral surface of the case 1 is directly applied. It will be. In some cases, the tip portion 61 of the magnetic body 6 may be deformed by the force due to the contact with the stepped portion 11 of the case 1, or the vicinity of the contact of the magnetic body 6 with the force due to the contact with the inner peripheral surface of the case 1 There is a case where it protrudes from the step portion 23 on the outer peripheral surface and shifts from a predetermined position. Due to this deformation or displacement of the magnetic material, the connection time (dwell time) when the contacts are closed during acceleration detection deviates from the design value, which reduces reliability, making it difficult to attach the magnetic material. Long installation time was required. Further, as shown in FIGS. 6 and 8, after inserting the U-shaped pin 81 serving as the connecting pin terminal 8, the member for defining the position is a thin resin bottom plate around the small hole 12 at the opening end of the case 1. Only one. Therefore, the connecting pin terminal 8 is fixed in an unstable state. Further, since the work for mounting / fixing the U-shaped pin 81 and the connection between the fixed connecting pin terminal 8 and the lead 7 of the reed switch are performed inside the case 1, the work is difficult to perform and a long processing time is required. Therefore, there is a problem that the manufacturing cost is increased and the reliability is lowered.

[0003]

[Problems to be solved by the device]

 An object of the present invention is to solve the above-mentioned problems and to provide a magnetic circuit composed of a magnetic material and a reed switch enclosed in a resin container composed of a case and a lid, and a coil spring enclosed in the same container. In the acceleration detector that detects the acceleration by activating the read switch when the permanent magnet biased by moves and approaches, the magnetic body can be assembled without causing distortion in the magnetic body, and the connection pin terminal The purpose of the present invention is to provide a highly reliable acceleration detector at low cost by providing a case and lid with a structure that allows easy assembly, fixing, and connection with the reed switch.

[0004]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention provides a magnetic circuit composed of a reed switch and a magnetic body enclosed in a resin-made storage container consisting of a case and a lid, and attached to the storage container with a coil spring. A groove is formed on the outer peripheral surface of the cylindrical part of the lid of the acceleration detector that detects the acceleration by activating the reed switch when the energized permanent magnet moves and approaches, and mount the magnetic body in the groove. In addition, a pin receiving base is provided on the entire surface of the lid, and a small hole is provided on a lower surface of the pin receiving base at a position corresponding to a small hole for inserting a connecting pin terminal provided in the case. This is an acceleration detector characterized by having a structure in which a U-shaped pin serving as a connecting pin terminal is fixed and held in a small hole provided in a pin receiving base of the case and the lid after the lid is attached to the case.

That is, the present invention comprises, as basic components, a reed switch, a permanent magnet, a coil spring, and a magnetic body, and a cylindrical case having a mounting mechanism of a connecting pin terminal for accommodating them, and the case. In an acceleration detector that is fitted with the inside of a lid and has a cylindrical part that holds a magnetic body on one side, the magnetic body is provided on the outer circumference of the cylindrical part that is inserted into the case of the lid. And an acceleration detector characterized by being fitted into a groove, and in the acceleration detector described above, a magnetic body formed by shaping a plate-like magnetic piece into a cylindrical shape is provided with a depth larger than the plate thickness of the magnetic body. In addition, an acceleration detector characterized by a structure assembled by mounting it in the groove of a lid in which a groove having a width wider than that of the magnetic body is processed, and a reed switch, a permanent magnet, Coil springs and magnets It is composed of a cylindrical case made of a flexible body and having a connecting pin terminal attachment mechanism for accommodating them, and a lid that fits inside the case and has a cylindrical portion holding the magnetic body on one side. In the acceleration detector, a small hole provided on a protruding pin receiving base machined on the opposite side of the tubular part of the lid at a position corresponding to the small hole for mounting the pin terminal of the case, and the small hole provided on the case. It is an acceleration detector characterized by a structure in which a U-shaped connecting pin terminal is fixed through a small hole.

[0006]

[Action]

 The groove provided in the tubular part of the lid is made to have a depth and width close to the thickness and width of the magnetic material and larger than the magnetic material, so that the magnetic material is completely stored in this groove and When the shaped part is inserted into the case part, it can be accurately assembled in a predetermined position without giving strain to the magnetic body. Further, since one connecting pin terminal composed of a U-shaped pin is inserted and fixed in the four small holes provided in the case and the lid, it is stably fixed without tilting to the front, rear, left and right. Also, after temporarily fixing the U-shaped pin to the lid, the lid is assembled into the case, and then the U-shaped pin is pushed down along the front surface of the lid and the guide so that it can be accurately inserted into the small hole of the case, and it can be easily placed in the correct position. Can be fixed to.

[0007]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front sectional view showing the structure of an acceleration detector according to an embodiment of the present invention. 2A and 2B are external perspective views showing a state before assembly of the lid portion and the case portion of the acceleration detector shown in FIG. 1, FIG. 2A shows the lid, and FIG. And show it. FIG. 3 is an exploded perspective view showing the assembly and disassembly of the magnetic body assembled to the lid shown in FIG. FIG. 4 is an external perspective view of the periphery of the front portion of the lid for explaining the assembly of the U-shaped pin according to the embodiment of the present invention. FIG. 5 is an external perspective view showing the front surface of the lid of the acceleration detector of the embodiment shown in FIG.

Example 1. Example 1 will be described with reference to FIGS. 1, 2 and 3. As shown in FIG. 1, the reed switch 3, the permanent magnet 4, and the coil spring 5 which are the basic components are mounted in the resin case 1, and the tubular portion 26 of the resin lid 2 is covered. The magnetic body 6 is attached to the outer peripheral surface of the case 1 and is fitted into the case 1. The shapes of the lid 2 and the magnetic body 6 are, as shown in FIGS. 2A and 3, a groove 21 is formed at the tip of the cylindrical tubular portion 26 of the lid 2, and the depth of the groove 21 is The dimension d and the width dimension w are set to be larger than the thickness dimension t and the width dimension A of the magnetic body 6 such that the magnetic body 6 can be loosely incorporated into the groove 21 and does not protrude outside the groove 21. . The magnetic body 6 is formed by forming a strip-shaped plate into a cylindrical shape, and is processed into the shape shown on the right side of FIG. This magnetic body 6 is incorporated in the groove 21 of the lid 2 as shown in the exploded perspective view of FIG. 3 and the external perspective view of FIG. As shown in FIGS. 2 (a) and 2 (b), the lid 2 having the magnetic body 6 assembled therein is inserted into the case 1 to assemble the acceleration detector, but the lid 2 is positioned by the cylinder of the lid 2. The tip portion 22 of the shaped portion 26 is brought into close contact with the step 11 of the case 1 so that the magnetic substance 6 and the reed switch 3 can be accurately positioned relative to each other. Therefore, the magnetic body 6 could be fixed at a predetermined position in the case 1 without applying any other force. After that, terminal processing etc. are performed and sealing and fixing with sealing resin is completed to complete the acceleration detector. Therefore, the duration (dwell time) when the reed switch contact was closed during acceleration detection was as designed, and an acceleration detector with good yield was manufactured.

Example 2. Example 2 will be described with reference to FIGS. 1, 4 and 5. As shown in FIG. 1, the reed switch 3, the permanent magnet 4, and the coil spring 5 which are the basic components are mounted in a resin case 1, and a resin lid 2 to which a magnetic body 6 is attached is attached to the case 1. It is fitted inside the. The U-shaped pin 81 that serves as the connecting pin terminal 8 is inserted into the small hole 24 provided in the pin receiving base 25 of the lid 2 and the small hole 12 provided in the bottom surface of the case 1, and the lead is provided in the central portion of the U-shape above it. The lead 7 of the switch is connected and completed. That is, as shown in FIGS. 4B and 5, the lid portion 2 is provided with a small hole 24 on the side opposite to the cylindrical portion 26 and made of the same material as the lid 2 at a position corresponding to the small hole 11 of the case 1. The pin receiving base 25 is provided so as to project in a plate shape, and the pin receiving base 25 has a protrusion 28 for reinforcing the pin receiving base in the center and both sides of the pin receiving base 25 when the U-shaped pin 81 is inserted. It is provided in contact with a plate-shaped guide 27 that functions as a guide. Assembly of the U-shaped pin 81 will be described with reference to FIGS. 4 (a) and 4 (b). As shown in FIG. 4 (a), the U-shaped pin 81 is temporarily fixed in the small hole 24 provided in the pin receiving base 25 of the lid 2 and the magnetic body 6 is attached to the groove 21 of the tubular portion 26. At the same time, it is attached to Case 1. When the lid 2 is pushed into a predetermined position while pulling out the lead 7 of the reed switch from the through hole in the center of the lid 2, the small hole 24 of the lid 2 and the small hole 12 of the case part are on the same axis. The U-shaped pin 81 is pushed and fixed along the guide 27 on the side of the pedestal 25. After that, the lead 7 of the reed switch is connected to the back of the U-shaped pin 81 and sealed with the sealing resin 10 to complete the acceleration detector. The U-shaped pin 81 is firmly fixed as a pin terminal 8 for connecting to the outside at a predetermined position of the case 1, and the U-shaped pin 81 is temporarily fixed to the lid 2 and assembled to the case 1. Since it is pushed in using the rear guide 27, it can be easily assembled.

[0010]

[Effect of device]

 As described above, according to the present invention, the magnetic body can be accurately fixed in a predetermined position without being deformed or displaced, and the pin terminal can be assembled easily and in a short time. It is possible to provide an acceleration detector with stable characteristics and good yield that can be firmly fixed and installed.

[Brief description of drawings]

FIG. 1 is a front sectional view showing the structure of an acceleration detector according to an embodiment of the present invention.

2A and 2B are external perspective views showing a state before the lid and the case of the acceleration detector shown in FIG. 1 are assembled, FIG. 2A shows the lid, and FIG. Show.

FIG. 3 is an exploded perspective view for explaining the assembling of the magnetic body to the lid shown in FIG. 2 (a).

FIG. 4 is an external perspective view of the periphery of the front portion of the lid for explaining the assembly of the U-shaped pin according to the embodiment of the present invention.

5 is an external perspective view showing the front surface of the lid of the acceleration detector of the embodiment shown in FIG.

FIG. 6 is a front sectional view showing the structure of a conventional acceleration detector.

FIG. 7 is an external perspective view showing a state before the lid of the conventional acceleration detector is assembled to the case, and FIG. 7A shows the lid,
FIG. 7B shows the case partially transparently.

FIG. 8 is an external perspective view illustrating a state in which a conventional acceleration detector is pulled out by a pin.

[Explanation of symbols]

 1 Case 11 Stepped portion 12 Small hole 2 Lid 21 Groove 22 Tip part (of tubular portion) 23 Stepped portion 24 Small hole 25 Pin receiving stand 26 Cylindrical portion 27 Guide 28 Protrusion 3 Reed switch 4 Permanent magnet 5 Coil spring 6 Magnetic body 61 Tip of magnetic material 7 Reed switch lead 8 Connection pin terminal 81 U-shaped pin 9 Fixing pin 10 Encapsulating resin d (depth of groove) dimension t (thickness of magnetic material) dimension w (width of groove) Dimension A (width of magnetic material) Dimension

Claims (3)

[Scope of utility model registration request] 1. A reed switch as a basic component,
A cylindrical case made up of a permanent magnet, a coil spring, and a magnetic body and having a connecting pin terminal mounting mechanism for accommodating them, and a cylindrical portion that fits inside the case and holds the magnetic body on one side. An acceleration detector configured by a lid having the magnetic body, wherein the magnetic body is fitted into a groove portion provided on an outer periphery of a cylindrical portion to be inserted into a case of the lid and attached. 2. The acceleration detector according to claim 1, wherein:
Assembling a magnetic body formed by shaping a plate-shaped magnetic piece into a cylinder into the groove of a lid having a groove with a depth larger than the plate thickness of the magnetic body and wider than the width of the magnetic body. Acceleration detector characterized by a modified structure. 3. A reed switch as a basic component,
A cylindrical case made up of a permanent magnet, a coil spring, and a magnetic body and having a connecting pin terminal mounting mechanism for accommodating them, and a cylindrical portion that fits inside the case and holds the magnetic body on one side. In an acceleration detector configured by a lid having, a small hole provided on a protruding pin pedestal formed on a side opposite to a cylindrical portion of the lid at a position corresponding to the pin terminal mounting small hole of the case, An acceleration detector characterized in that a U-shaped connecting pin terminal is fixed through a small hole provided in a case.