JP5563925B2 - Switch device - Google Patents

Description

  The present invention relates to a switch device.

  2. Description of the Related Art Conventionally, there has been provided a switch device that is connected to a brake pedal of a motorcycle via a connecting member and switches on / off of a stop lamp according to the operation of the brake pedal (see, for example, Patent Document 1). This switch device forms a contact portion between a rod-shaped shaft member coupled to the coupling member, a cylindrical contact attached to the shaft member so as to cover the side surface of the shaft member, and the contact A contact plate and a case for storing them. The above-mentioned shaft member is movable between a conduction position where the contactor contacts the contact plate and a non-conduction position where the contactor does not contact the contact plate according to the operation of the brake pedal. When the contact is brought into contact with the contact plate, the stop lamp is turned on.

JP 2009-81021 A (paragraph [0011] -paragraph [0024] and FIGS. 1-5)

  In the switch device shown in Patent Document 1 described above, the shaft member moves while sliding with the inner peripheral surface of the case. Since it is not a structure, there is a possibility that water or dust may enter from the sliding portion. And the water and dust which entered from the sliding part adhere to the contactor and the contact plate stored in the case, and as a result, the contact reliability between the contactor and the contact plate may be lowered. . Further, in this conventional example, the contactor and the contact plate slide, and the contactor or the contact plate is worn over time, so the reliability of the contact point is limited.

  The present invention has been made in view of the above problems, and its object is to provide a non-contact type switch device that has improved reliability by protecting the detection unit and the signal output unit from water and foreign matter. It is to provide.

The switch device of the present invention outputs a detection unit for detecting the position of a detection body provided at the tip of a linearly moving shaft, and outputs either an on signal or an off signal based on the detection result of the detection unit. A signal output unit, a first case having a sealed structure in which the detection unit and the signal output unit are accommodated, and a second case in which at least the shaft is accommodated and connected to the first case , The detection unit is a coil made of a conductive pattern formed on a substrate constituting the signal output unit, and has a cylindrical shape having an opening on the surface of the first case and a recess into which the detection body is inserted so as to freely advance and retract. A portion is provided in the first case, and a positioning portion for positioning the substrate housed in the first case is provided in the cylindrical portion .

In this switch device, signal output portion, one of the ON signal or the OFF signal based on the inductance change of coil in accordance with the opposing area between the detection of the coil in a direction intersecting the moving direction of the shaft It is preferable to output.

  There is an effect that it is possible to provide a non-contact type switch device with improved reliability by protecting the detection unit and the signal output unit from water and foreign matter.

It is a disassembled perspective view of the switch apparatus which concerns on this invention. It is an external appearance perspective view same as the above. It is sectional drawing same as the above.

  Embodiments of a switch device according to the present invention will be described below with reference to FIGS. The switch device according to the present invention is connected to, for example, a brake pedal of a two-wheeled vehicle, and is used for switching on / off of a stop lamp according to an operation of the brake pedal.

  FIG. 1 is an exploded perspective view of a switch device A according to the present invention. The switch device A includes a substrate block 5, a shaft 6, and a detection plate (detection body) 4 attached to the tip of the shaft 6. A case (first case) 1 in which the substrate block 5 is accommodated and a case (second case) 2 in which the shaft 6 is accommodated are provided as main components.

  The case 1 is, for example, a synthetic resin molded product, and includes a rectangular box-shaped case main body 10 having an upper surface opened and a rectangular plate-shaped cover 12 that is attached to the case main body 10 so as to close the opening. Is done. A rectangular plate-like connecting plate 11 having a slightly larger dimension than that of the case body 10 is integrally provided on one end side (case 2 side) of the case body 10 and on the other end side in the longitudinal direction. A connector 9 having a waterproof property is attached. Further, as shown in FIG. 3, the case main body 10 has a rectangular tube-shaped cylindrical portion 14 provided with a concave portion 14 a that opens on the surface of the case main body 10 and into which the detection plate 4 is inserted so as to be able to advance and retreat. It is provided in a shape protruding inward. Further, as shown in FIG. 3, a pair of connection terminals 13 (only one is shown in FIG. 3) is simultaneously formed on the case body 10, and one end side of each connection terminal 13 protrudes to the connector 9 side. ing. Here, a pair of positioning projections (positioning portions) 15 (only one of them is shown in FIG. 3) are integrally provided on the cylindrical portion 14 for positioning a printed circuit board 50 described later. For example, the case 1 is hermetically sealed by welding the cover 12 to the case main body 10 by laser welding, and the connector 9 is connected to a connector (not shown) corresponding to the connector 9 by connecting the connection terminal 13. , 13 are in a sealed state.

  The case 2 is a synthetic resin molded product like the case 1 and has a case body 20 formed in a cylindrical shape. A rectangular plate-like connecting plate 21 set to the same size as the connecting plate 11 of the case body 10 is integrally provided on the other end side in the longitudinal direction of the case body 20 (case 1 side). Are provided with a fitting groove 20a into which the fitting protrusion 3a provided on the rubber boot 3 is fitted over the entire circumference (see FIG. 3). Here, the cases 1 and 2 have an integrated structure by welding the connecting plates 11 and 21 by laser welding, for example.

  The board block 5 includes a printed board 50 formed in a rectangular plate shape. The printed board 50 has through holes 50 a and 50 a through which the connection terminals 13 and 13 are inserted, and positioning protrusions provided on the case body 10. 15 and 15 are provided with insertion holes 50b and 50b, respectively. Further, a coil pattern (not shown) is formed on the back surface of the printed circuit board 50 as a detection unit that detects the position of the detection plate 4. Further, the printed circuit board 50 is compared with an oscillation circuit for causing a current of a predetermined frequency to flow through the coil pattern, and an inductance of the coil pattern is compared with a preset threshold, and a stop lamp ( A signal processing circuit (signal output unit) composed of a comparison circuit that outputs an ON signal for turning on (not shown) or an OFF signal for turning off the stop lamp is mounted.

  The shaft 6 is made of, for example, a metal elongated rod, and an insertion hole 6a through which a connecting member (not shown) for connecting to the brake pedal is inserted is provided on one end side (case 2 side) in the longitudinal direction. Yes. A metal detection plate 4 formed in an L shape is attached to the other end side of the shaft 6 in the longitudinal direction.

  Here, FIG. 3 is a cross-sectional view of the switch device A. The shaft 6 is housed in the cylinder of the case body 20, and the detection plate 4 attached to the front end side of the switch device A can be freely advanced and retracted into the recess 14a. Arranged to be inserted. As shown in FIG. 3, the shaft 6 is moved in the longitudinal direction by a return spring 7 disposed between the washer 22 disposed on one end side in the longitudinal direction in the cylinder of the case body 20 and the detection plate 4. The elastic force is applied to the end side. In this example, as shown in FIG. 3, the amount of insertion of the detection plate 4 into the recess 14 a is limited to a predetermined amount by the front end portion of the shaft 6 coming into contact with the outer surface of the case body 10. It has become.

  Here, the assembly procedure of the switch device A will be described. In the following description, it is assumed that the detection plate 4 is attached to the shaft 6 in advance. Each of the connection terminals 13 and 13 is inserted into the through holes 50a and 50a provided in the printed board 50, and the positioning protrusions 15 and 15 provided in the case body 10 are inserted into the insertion holes 50b and 50b, respectively. The printed board 50 is placed on the upper surface of the cylindrical portion 14. In this state, when each connection terminal 13 is fixed to the printed circuit board 50 by soldering, the substrate block 5 is stored in a state of being held by the case body 10. When the cover 12 is welded to the case body 10 by laser welding, the case 1 is assembled.

  Subsequently, the shaft 6 on which the return spring 7 and the washer 22 are externally inserted is inserted into the cylinder of the case body 20, and the connecting plate 11 of the case body 10 and the connecting plate 21 of the case body 20 are attached to each other. When laser welding is performed, the case 1 and the case 2 are integrally connected. Finally, when the fitting protrusion 3a provided on the boot 3 is fitted into the fitting groove 20a formed at the rear end of the case body 20, the boot 3 is attached to the case 2 and the switch device A Assembly is complete (see FIG. 2). At this time, the detection plate 4 is in a state where a part thereof is inserted into the recess 14 a of the cylindrical portion 14.

  Next, the operation of the switch device A will be described. When the shaft 6 is pulled outward in response to the depression of the brake pedal, the amount of insertion of the detection plate 4 attached to the tip of the shaft 6 into the recess 14a is reduced. As a result, the area of the coil pattern facing the detection plate 4 on the printed board 50 in the direction intersecting the moving direction of the shaft 6 (vertical direction in FIG. 1) decreases, and the inductance of the coil pattern changes. In the signal processing circuit, the inductance of the coil pattern is compared with the threshold value, and an ON signal for lighting the stop lamp is output to the outside through the connection terminals 13 and 13. When the depression of the brake pedal is released, the shaft 6 is pushed inward by the spring reaction force of the return spring 7, and as a result, the facing area increases and the inductance of the coil pattern changes. In the signal processing circuit, the inductance of the coil pattern is compared with the threshold value, and then an off signal for turning off the stop lamp is output to the outside via the connection terminals 13 and 13.

Thus, according to the present embodiment, since the substrate block 5 constituting the detection unit and the signal output unit is housed in the case 1 having a sealed structure, the substrate block 5 can be protected from water and foreign matter. can, as a result, it is possible to detect the accuracy of the detection unit (coil) provides a high switching device a reliable and can be suppressed from decreasing. Further, since the position of the detection plate 4 provided on the shaft 6 connected to the brake pedal is directly detected by the coil pattern, the position of the detection plate 4 can be detected with high accuracy, and like a magnetic sensor. Since it is not necessary to use a separate part such as a magnet, the cost can be reduced compared to a magnetic sensor. Furthermore, since the coil pattern constituting the detection unit is formed on the printed circuit board 50 constituting the signal output unit, parts such as the detection coil and the coil bobbin can be reduced, resulting in further cost reduction. Can be planned.

  Further, the printed circuit board 50 on which the coil pattern is formed is positioned by the positioning protrusions 15 and 15, and the detection plate 4 is inserted into the concave portion 14 a of the cylindrical portion 14. Therefore, by holding the printed circuit board 50 in the case 1 and guiding the detection plate 4 attached to the shaft 6 into the recess 14a of the case 1, the positional accuracy of the coil pattern and the detection plate 4 can be improved. As a result, the switch device A with improved detection accuracy can be realized. Furthermore, according to the present embodiment, since the coil pattern formed on the printed circuit board 50 and the detection plate 4 are not in contact with each other, there is an advantage that they are not worn as in the conventional example.

1 case (first case)
2 case (second case)
4 Detection plate (detection body)
5 Board block (detection unit, signal output unit)
6 Shaft A switch device

Claims (2)

A detection unit for detecting the position of the detection body provided at the tip of the linearly moving shaft;
A signal output unit that outputs either an on signal or an off signal based on the detection result of the detection unit;
A first case having a sealed structure and accommodating the detection unit and the signal output unit;
A second case in which at least the shaft is housed and connected to the first case ;
The detection unit is a coil made of a conductive pattern formed on a substrate constituting the signal output unit,
A cylindrical portion provided in the first case is provided with a concave portion that is open on the surface of the first case and in which the detector is inserted so as to be able to advance and retreat. The substrate housed in the first case A switch device, wherein a positioning portion for positioning is provided on the cylindrical portion . Before SL signal output unit, one of the ON signal or the OFF signal based on the inductance change of said coil in response to the opposing area between the detection of the coil in a direction intersecting the moving direction of said shaft The switch device according to claim 1, wherein one of them is output .

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