JP4929850B2 - Vehicle switch - Google Patents

Description

  The present invention relates to a vehicular switch that is mainly used for controlling the extinction of a stop lamp when operating a brake pedal of an automobile.

  In recent years, a push-operated type vehicle switch is mainly used for controlling the stop lamp accompanying the operation of the brake pedal. The stop lamp is turned on when the brake pedal is depressed and turned off when the brake pedal is released. ing.

  Such a conventional push switch for a vehicle will be described with reference to FIGS.

  FIG. 6 is a sectional view of a conventional vehicle switch. In FIG. 6, reference numeral 1 denotes a case made of a substantially box-shaped insulating resin with an opening on the upper surface, and 2 an operating body housed in the case 1 so as to be movable up and down. The case 1 is provided with a plurality of fixed contacts 3 in which terminal portions 3A protrude from the bottom surface.

  Reference numeral 4 denotes a movable contact made of a conductive metal, and the movable contact 4 is elastically contacted to the plurality of fixed contacts 3 from below by a contact pressure spring 5 mounted in a slightly bent state between the bottom of the case 1. The plurality of fixed contacts 3 are electrically connected via the movable contact 4.

  Reference numeral 6 is a return spring, and 7 is a cover that covers the opening on the upper surface of the case 1. The return spring 6 is mounted in a slightly bent state between the lower surface of the operating body 2 and the bottom surface of the case 1. The operation unit 2A at the upper end of the operating body 2 protrudes upward from the hollow cylinder portion 7A at the center of the cover 7 to constitute the vehicle switch 10.

  As shown in the side view of FIG. 5, the vehicular switch 10 thus configured is generally in a state where the operating shaft 2A of the operating body 2 is pressed by the arm 11A in front of the brake pedal 11 of the automobile. The terminal portion of the fixed contact 3 that is mounted and protrudes from the bottom surface of the case 1 is connected to a stop lamp and an electronic circuit by the connector 12.

  That is, when the brake pedal 11 is not depressed, the operation shaft 2A of the operating body 2 is pressed downward, the contact pressure spring 5 and the return spring 6 are bent, and the movable contact 4 moves downward to move the fixed contact. Since it is away from 3 and is electrically disconnected, the stop lamp is turned off.

  When the brake pedal 11 is depressed, the arm 11A is separated from the operation shaft portion 2A and the pressing force is removed, so that the operating body 2 moves upward by the elastic return force of the return spring 6 as shown in FIG. At the same time, the movable contact 4 is also pressed by the contact pressure spring 5 to elastically contact the fixed contact 3, so that the plurality of fixed contacts 3 are electrically connected and the stop lamp is lit.

  In addition, as described above, such a vehicle switch 10 is used in a place near the brake pedal 11 of the vehicle where there is relatively much dust, gas, moisture, etc., and presses the operation shaft 2A of the operating body 2. Generally, a lubricant or the like is applied to the arm 11A or the like to be operated.

  For this reason, these lubricants, gas, dust, moisture, etc. penetrate into the switch and adhere to the fixed contact 3 or the movable contact 4, and carbide or silicon compound is formed on the contact surface of the contact, so that the electrical In order to prevent troubles in the automatic contact / separation, the operation part 2A and the hollow cylinder 7A are covered with a rubber cap, or an adhesive or a shielding material is applied to the gap between the case 1 and the cover 7 and sealed. In general, the switch has a sealed structure.

As prior art document information related to the invention of this application, for example, Patent Document 1 is known.
JP 2004-342437 A

  However, in the conventional vehicle switch described above, in order to perform stable electrical contact / separation of contacts, it is necessary to make the switch a sealed structure, which increases the number of components and takes time to assemble the switch. There was a problem that it took.

  The present invention solves such a conventional problem, and an object of the present invention is to provide a vehicular switch capable of reliable electrical contact and separation with a simple configuration.

In order to achieve the above object, the present invention provides a substantially box-shaped case, an operating body accommodated in the case so as to be movable up and down, a spring for biasing the operating body upward, and the operating body. And a circuit board housed in the case and detecting means for detecting the magnetism of the magnet and a control means connected to the detecting means for opening and closing the switching means. When the operating body is at the lower limit position, the detection magnetism is weak, the operating body moves upward, the detection means and the magnet approach, the detection magnetism becomes strong, and the operating body moves upward. In the position where the detection means and the magnet coincide with each other, the detected magnetism is strongest, and further, the operating body moves upward, and when the operating body is in the upper limit position, the detected magnetic field is equal to or higher than the first value. The above test With placing means, said control means when the detected magnetic is more the first value to the switching means and the closed state or the open state, the detected magnetic following the first value is less than the second value In this case, the vehicle switch is configured to set the switching means to the open state or the closed state, and there is no fixed contact or movable contact. Therefore, there is no electricity due to surrounding lubricant, gas, dust, moisture, etc. It is possible to obtain a vehicular switch capable of reliable electrical contact and separation with a simple configuration by opening and closing the switching means according to the strength of magnetism. Has an effect.

  As described above, according to the present invention, it is possible to obtain an advantageous effect that it is possible to realize a vehicle switch capable of reliable electrical contact and separation with a simple configuration.

  Embodiments of the present invention will be described below with reference to FIGS.

(Embodiment)
FIG. 1 is a cross-sectional view of a vehicle switch according to an embodiment of the present invention, and FIG. 2 is a circuit diagram of the same. In FIG. The resin case 22 is a substantially cylindrical and similarly insulating resin operating body. The operating body 22 is accommodated in the case 21 so as to be movable up and down, and a magnet 23 is attached to the lower side surface of the operating body 22. Has been.

  Reference numeral 24 denotes a terminal made of a conductive metal such as a copper alloy, 25 denotes a wiring board on which a plurality of wiring patterns (not shown) are formed on the left and right surfaces, and the wiring board 25 is disposed on the left side wall of the case 21. In addition, the upper ends of the plurality of terminals 24 are connected to the wiring pattern of the wiring substrate 25 by soldering or the like, and the lower ends of the terminals 24 protrude downward from the bottom surface of the case 21.

  In addition, a detection means 26 such as a Hall element and a switching means 27 such as a power transistor are formed on the surface of the wiring board 25 facing the magnet 23, and a differential amplifier 28A such as an FET, a voltage detector 28B, and the like. The control means 28 is formed by the fixed resistor, and the detection means 26 and the switching means 27 are connected to the control means 28.

  Furthermore, 29 is a coiled return spring, 30 is an insulating resin cover that covers the opening on the upper surface of the case 21, and the return spring 29 is slightly bent between the lower surface of the operating body 22 and the bottom surface of the case 21. The actuator 22 is attached to urge the operating body 22 upward, and the locking portion 22B below the operating body 22 abuts the lower surface of the cover 30 so that the upper limit position of the operating body 22 is regulated.

  A hollow cylinder portion 30A that protrudes upward is provided at the center of the upper surface of the cover 30, and the operating shaft 22A of the operating body 22 is inserted into the hollow cylinder portion 30A so as to be movable up and down, and the upper end of the operating shaft 22A is hollow cylinder A vehicle switch 35 is configured to protrude upward from the portion 30A.

  As shown in the side view of FIG. 5, the vehicle switch 35 configured as described above is generally in a state where the operation shaft 22 </ b> A of the operating body 22 is pressed by the arm 11 </ b> A before the brake pedal 11 of the automobile. A plurality of terminals 24 that are mounted and project from the bottom surface of the case 21 are connected to the stop lamp 31 shown in FIG.

  That is, when the brake pedal 11 is not depressed, as shown in the sectional view of FIG. 3, the operating body 22 is pressed downward by a predetermined pressing amount, for example, 6 mm while the return spring 29 is bent, and the operating body 22 is operated. The lower surface is in contact with the inner bottom surface of the case 21, and the operating body 22 is in the lower limit position.

  And when this operating body 22 is in the lower limit position, the magnet 23 mounted on the side surface of the operating body 22 moves downward, and the center of the detection means 26 arranged opposite to the center of the magnet 23 is greatly separated. As shown in the magnetic waveform diagram of FIG. 4, the magnetism of the magnet 23 detected by the detecting means 26 is weak.

  Further, the control means 28 connected to the detection means 26 closes the switching means 27 when the magnetic flux density is 30 mT (millitesla) or more depending on the strength of the magnetism detected by the detection means 26, and the magnetic flux When the density is 20 mT or less, the switching means 27 is opened. Therefore, when the operating body 22 is in the lower limit position, the switching means 27 is opened, and a plurality of light emitting diodes or the like are stopped. The lamp 31 is turned off.

  When the brake pedal 11 is depressed, the arm 11A is separated from the operating shaft 22A and the pressing force is removed, so that the operating body 22 moves upward by the elastic return force of the return spring 29, as shown in FIG. The locking portion 22B comes into contact with the lower surface of the cover 30, and the operating body 22 is held at the upper limit position.

  At this time, since the magnet 23 attached to the operating body 22 also moves upward and approaches the detection means 26 arranged oppositely, the magnetism of the magnet 23 detected by the detection means 26 becomes stronger, as shown in FIG. When the pressing amount approaches 4 mm, the magnetic flux density of the magnet 23 becomes 30 mT or more, so the control means 28 switches the switching means 27 to the closed state, and the stop lamp 31 is lit.

  After that, the operating body 22 further moves upward, and after the magnetic flux density reaches the strongest magnetic flux density at the position where the center of the magnet 23 coincides with the center of the detection means 26, that is, the position where the pressing amount is near 2 mm, The portion 22B comes into contact with the lower surface of the cover 30 and the operating body 22 is at the upper limit position. At this upper limit position, the magnetic flux density of the magnet 23 is around 40 mT, so the lighting state of the stop lamp 31 is maintained.

  In other words, the magnet 23 is mounted on the operating body 22 accommodated in the case 21 so as to be movable up and down, the detection means 26 for detecting the magnetism of the magnet 23, and the control means 28 connected to the detection means 26 are provided. The control means 28 opens and closes the switching means 27 and turns off the stop lamp 31 according to the strength of the magnet 23 accompanying the pressing operation of the operating body 22, so that dust, gas, moisture, lubricant, etc. Even when used in many places, since it does not use a mechanical structure such as a fixed contact or a movable contact that is susceptible to these influences, the switch can be securely connected and disconnected.

  Further, the magnet 23 mounted on the operating body 22 and the detecting means 26 facing the magnet 23 are set to a predetermined magnetic flux density at the upper limit position of the operating body 22, for example, 30 mT or more, and at a lower limit position, a predetermined magnetic flux density, for example, 20 mT or less. Even when the actuator 22 is slightly displaced, the control means 28 closes the switching means 27 at the upper limit position of the operating body 22 and opens it at the lower limit position. The stop lamp 31 is reliably turned on at the upper limit position and is surely turned off at the lower limit position.

  That is, the magnet 23 and the detection means 26 are arranged so that the magnetism is strong at the upper limit position of the operating body 22 and weak at the lower limit position, and the control means 28 switches the switching means 27 according to the detected magnetism strength. By opening and closing, the switching means 27 is reliably closed at the upper limit position, and the switching means 27 is reliably opened at the lower limit position.

  As described above, according to the present embodiment, the magnet 23 is attached to the operating body 22 accommodated in the case 21 so as to be movable up and down, and the magnetism of the magnet 23 is different between the upper limit position and the lower limit position. When the control means 28 arranged in this manner and connected to the detection means 26 opens and closes the switching means 27 according to the strength of the magnetism, it is used in a place where there is a lot of dust, gas, moisture, lubricant, etc. In addition, it is possible to obtain a vehicular switch that is not affected by these effects and that can be securely connected and disconnected with a simple configuration.

  In the above description, the detection means 26 is disposed above, and the switching means 27 is closed when the operating body 22 is strong at the upper limit position, and the switching means 27 is opened when the magnetism is weak at the lower limit position. In contrast to this, the detection means 26 is disposed below, and when the operating body 22 is at the upper limit position, the magnetism is weakened, and at the lower limit position, the magnetism is strengthened. The present invention can be implemented even if the control means 28 opens and closes the switching means 27 according to the above.

  Further, in the above description, the push operation type vehicle switch operated mainly by the brake pedal has been described. However, the switch used for other functions such as opening and closing of the door, or the operating body is swung. The present invention can also be implemented in a switch of an operation method other than the pressing operation such as sliding in parallel.

  The vehicle switch according to the present invention can be obtained with a simple configuration and capable of reliable electrical contact / separation, and is therefore mainly useful for controlling the turn-off of a stop lamp of an automobile.

Sectional drawing of the switch for vehicles by one embodiment of this invention Same circuit diagram Cross section during the same operation Magnetic waveform diagram Side view of main parts Sectional view of a conventional vehicle switch

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Brake pedal 11A Arm 12 Connector 21 Case 22 Actuator 22A Operation shaft 22B Locking part 23 Magnet 24 Terminal 25 Wiring board 26 Detection means 27 Switching means 28 Control means 28A Differential amplifier 28B Voltage detector 29 Return spring 30 Cover 30A Hollow Tube part 31 Stop lamp 35 Switch for vehicle

Claims (1)

A substantially box-shaped case, an operating body accommodated in the case so as to be movable up and down, a spring for biasing the operating body upward, a magnet mounted on the operating body, and a housing accommodated in the case a detecting means for detecting magnetism of the magnet, this is connected to the detection means consist of a wiring board control means is formed for opening and closing the switching means, in the magnetic said actuating member is the lower limit position of the magnet, the detection The magnetism is weak, the operating body moves upward, the detection means and the magnet approach each other, the detection magnetism increases, and the operating body moves upward so that the detection means and the magnet coincide with each other. In the position, the detection magnetism is the strongest, and further, the operating body moves upward, and when the operating body is at the upper limit position, the detection means is disposed so that the detection magnetic field is equal to or greater than a first value , Control hand Open state the switching means is the detected magnetic is equal to or larger than the first value to the switching means and the closed state or the open state, the case detection magnetic is less than the first value is less than the second value Or a vehicle switch set to be in a closed state .

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