JP2008117684A - Vehicular switch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicular switch capable of sure electric connection and disconnection by a simple and easy constitution regarding the vehicular switch used mainly for lighting on/off control or the like of a stop lamp of an automobile. <P>SOLUTION: A movable contact 30 of which one end is retained by a driving object 23 carries out lighting on/off of the stop lamp 35 by a non-contact method switching means 29 since after an arm part 30A contacts a fixed contact 24 arranged and installed in a case 21, a contact part 30B contacts, and the non-contact method switching means 29 carries out electric opening and closing according to this connection and disconnection. Further, since the movable contact 30 and the fixed contact 24 contact at different points immediately after contact and when connected, even in the case a small amount of dust, gas, and humidity or the like invades into the switch, the vehicular switch capable of sure electric connection and disconnection can be obtained by a simple constitution. <P>COPYRIGHT: (C)2008,JPO&INPIT

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 vehicle switch will be described with reference to FIG.

  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 portion 2A at the upper end of the operating body 2 protrudes upward from the hollow cylindrical portion 7A at the center of the cover 7 to constitute a vehicle switch.

  The vehicular switch configured as described above is generally mounted in front of the brake pedal of an automobile in a state where the operation shaft 2A of the operating body 2 is pressed by an arm or the like and is fixed from the bottom surface of the case 1 A terminal portion 3A of the contact 3 is connected to a stop lamp such as a light emitting diode by a connector or the like.

  That is, when the brake pedal is not depressed, the operation portion 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 3. The stop lamp is extinguished because it is in an electrically disconnected state.

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

  Since such a vehicle switch is used in a place near the brake pedal of the vehicle where there is a relatively large amount of dust, gas, moisture, etc., the dust, gas, moisture, etc. are activated. There is a possibility of entering the switch from the body 2 and the hollow cylinder portion 7A or the gap between the case 1 and the cover 7 or the like.

  In addition, when a light emitting diode is used for the stop lamp, a current of about DC12V1A to 2A is passed between the movable contact 4 and the fixed contact 3, so that dust, gas, moisture, etc. are in the switch. If it penetrates and adheres to the movable contact 4 or the fixed contact 3, carbides, silicon compounds, etc. are formed on the contact surface, which becomes a factor that hinders electrical contact and separation of the contact.

  For this reason, in the vehicle switch as described above, in order to prevent such dust, gas, moisture and the like from entering the switch, the operation part 2A and the hollow cylinder part 7A are covered with a rubber cap, In general, the switch has a sealed structure by applying an adhesive or a shielding material to the gap of the cover 7 and sealing it.

As prior art document information related to the invention of this application, for example, Patent Document 1 is known.
JP 2001-84867 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 has the following configuration.

  According to the first aspect of the present invention, the movable contact whose one end is held by the driving body comes into contact with the fixed contact disposed in the case, after the arm portion contacts the contact portion. The switching means is configured as a vehicle switch so that the switching means is electrically opened and closed according to contact and separation, and the stop lamp is turned off and turned on by the non-contact type switching means, and some dust, gas, moisture Even when a switch enters the switch, the movable contact and the fixed contact come into contact at different locations immediately after contact and at the time of connection, thereby obtaining a vehicle switch capable of reliable electrical contact with a simple structure. It has the effect of being able to.

  The invention according to claim 2 is the invention according to claim 1, wherein when the movable contact and the fixed contact are separated, a gap is provided between them, and foreign matter or oxide adheres to the contact. In addition, there is an effect that the insulation between the contacts can be reliably ensured by the gap.

  According to a third aspect of the present invention, in the first aspect of the invention, the fixed contact and the switching means are integrally formed via the wiring board, and the fixed contact and the switching means can be easily formed, and the switch Even if assembled, it can be easily performed.

  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, FIG. 2 is an exploded perspective view thereof, and 21 is an insulating resin such as polybutylene terephthalate or ABS having a top opening and a substantially box shape. A case 22 made of an insulating resin is substantially cylindrical and is made of an insulating resin, and a driving body 23 is also made of an insulating resin. The driving body 23 is disposed below the operating body 22, and the driving body 23 and the operating body. 22 is accommodated in the case 21 so as to be movable up and down.

  Reference numeral 24 is a substantially L-shaped or substantially U-shaped fixed contact made of a conductive metal such as a copper alloy, 25 is a holding body made of an insulating resin, and a plurality of fixed contacts 24 are plated with silver or tin. At the same time, the pair of fixed contacts 24 are positioned by insert molding or the like so that the bent portions 24 </ b> A are opposed to each other, and are integrally formed with the holding body 25.

  Further, the holding body 25 is composed of three connector terminals 26 projecting downward and connected to or separated from the fixed contact 24 by the same material having the same thickness as the fixed contact 24 and 4 projecting sideways. The connection terminals 27 of the book are integrally molded and disposed in the case 21.

  Reference numeral 28 denotes a wiring board having a plurality of wiring patterns (not shown) formed on the front and back surfaces. As shown in the circuit diagram of FIG. 3, the wiring board 28 includes a MOS-FET 29A and an overcurrent detection IC 29B. Various electronic components such as the formed switching means 29, a surge absorbing Zener diode, and a resistor are mounted.

  The wiring board 28 and the connection terminal 27 on the side of the holding body 25 are connected by soldering or the like, and the fixed contact 24 and the switching means 29 are integrally formed via the wiring board 28 and three The connector terminals 26A, 26B, and 26C protrude downward from the bottom surface of the case 21, as shown in FIG.

  The connection terminal 27 includes four connection terminals 27A and 27B connected to the connector terminal 26A, four connection terminals 27C connected to the connector terminal 26C, and connection terminals 27D separated from these, and one side is grounded. The number of units is small.

  In addition, 30 is a substantially U-shaped movable contact made of a conductive metal such as a copper alloy, and the upper end of the arm portion 30A is held on the lower surface of the driving body 23, and the entire arm portion 30A is slightly bent, A contact portion 30B bent in a substantially arc shape at the lower end is in elastic contact with the side surface of the fixed contact 24 above the bent portion 24A.

  The surface of the movable contact 30 is plated with silver, tin or the like, and the surface of the fixed contact 24 is coated with a silicone oil-based lubricant (not shown) so that the contact portion 30B It is designed to reduce wear caused by elastic contact sliding.

  Reference numeral 31 denotes a spring made of steel or copper alloy wire wound in a coil shape, 32 denotes a spacer in which a through-hole through which the operating body 22 is inserted is formed at the center, and the spring 31 is the lower surface of the drive body 23 and the bottom surface of the case 21 Are attached in a slightly bent state to urge the driving body 23 and the operating body 22 upward, and a spacer 32 is press-fitted onto the upper surface of the case 21 and temporarily held.

  Reference numeral 33 denotes a metal or insulating resin cover that covers the opening on the upper surface of the case 21, and a hollow cylinder portion 33A that protrudes upward is provided at the center of the upper surface. The operating body 22 moves up and down in the hollow cylinder portion 33A. The vehicle switch is configured such that the upper end of the operation portion 22A protrudes upward from the hollow cylinder portion 33A while being inserted through the vehicle.

  Then, the vehicular switch configured as described above is mounted in a state where the operation portion 22A of the operating body 22 is pressed by an arm or the like, generally before the brake pedal of the automobile, and as shown in FIG. The connector terminal 26A protruding from the bottom surface of the case 21 is connected to the battery 34 by a connector or a lead wire, the connector terminal 26B is connected to a stop lamp 35 such as a light emitting diode, and the connector terminal 26C is connected to the ground.

  That is, when the brake pedal is not depressed, as shown in the sectional view of FIG. 4, the operating body 22 and the driving body 23 are pressed downward while bending the spring 31, and the movable contact 30 moves downward. Thus, the contact portion 30B is separated from the fixed contact 24, and a gap is formed between the movable contact 30 and the fixed contact 24, and the pair of fixed contacts 24 are electrically disconnected.

  Therefore, since the switching means 29 connected to the fixed contact 24 is also in the open state, the stop lamp 35 such as a light-emitting diode is in an extinguished state.

  When the brake pedal is depressed, the operation body 22 and the drive body 23 are moved upward by the urging force of the spring 31 as shown in the sectional view of FIG. The lower end of the arm portion 30A above the contact portion 30B of the contact 30 contacts the bent portion 24A of the fixed contact 24, and the pair of fixed contacts 24 are electrically connected.

  For this reason, the MOS-FET 29A of the switching means 29 is operated, the switching means 29 is closed, and the stop lamp 35 such as a light emitting diode is turned on.

  At this time, the current around DC12V1A to 2A, which is energized to the stop lamp 35 such as a light emitting diode, is switched by the MOS-FET 29A. Therefore, it is difficult to form carbides, silicon compounds, and the like.

  After that, when the brake pedal is further depressed and the arm is separated from the operating portion 22A of the operating body 22 and the pressing force is removed, the operating body 22 and the driving body 23 are further moved upward by the biasing force of the spring 31. Return to the state shown in FIG.

  At the same time, while the contact between the movable contact 30 and the fixed contact 24 is maintained, the contact portion 30B of the movable contact 30 is elastically slid along the side surface of the fixed contact 24 after elastically contacting the bent portion 24A. In order to return to the state of FIG. 1, the stop lamp 35 remains lit.

  In other words, the stop lamp 35 is turned off and on by opening and closing the MOS-FET 29A of the non-contact type switching means 29, so that the switch is in the vicinity of the brake pedal of the vehicle where there is relatively much dust, gas, moisture, etc. The stop lamp 35 can be reliably turned off and turned on even when they enter the switch.

  When the movable contact 30 comes into contact with the fixed contact 24 as the drive body 23 moves upward, the lower end of the arm 30A above the contact 30B first contacts the bent portion 24A. The portion 30B slides elastically on the side surface of the fixed contact 24, and the movable contact 30 and the fixed contact 24 are electrically connected. Therefore, even when some foreign matter adheres to the contact surface, stable electrical Connection is maintained.

  That is, the lower end of the arm 30A and the bent portion 24A immediately after contact, the contact 30B and the side of the fixed contact 24 when connected, and the movable contact 30 and the fixed contact 24 contact at different locations immediately after contact and when connected. By doing so, even when the surrounding dust, gas, moisture or the like slightly enters the switch, the movable contact 30 and the fixed contact 24 are surely electrically connected and separated, and the switching means 29 It can be opened and closed electrically.

  Further, when the driving body 23 is pressed downward and the movable contact 30 and the fixed contact 24 are separated, a gap is formed between them, so that foreign matters, oxides, etc. are attached to the contacts. Even in this case, it is possible to reliably ensure insulation between the contacts by the gap.

  As described above, according to the present embodiment, after the movable contact 30 having one end held by the drive body 23 contacts the fixed contact 24 disposed in the case 21, the contact portion 30 </ b> B The contact means and the switching means 29 are electrically opened and closed in accordance with the contact and separation, whereby the stop lamp 35 is turned off by the non-contact type switching means 29 and immediately after the movable contact 30 and the fixed contact 24 are brought into contact with each other. When connecting to a vehicle, it can be contacted at different points, so even if some dust, gas, moisture, etc. penetrates into the switch, it is possible to obtain a vehicle switch that can be securely connected and disconnected with a simple configuration. It can be done.

  In addition, when the movable contact 30 and the fixed contact 24 are separated from each other, a gap is provided between them to ensure insulation between the contacts by the gap even when foreign matter or oxide adheres to the contact. Can do.

  Then, the pair of fixed contacts 24 and the connector terminal 26 and the connection terminal 27 are formed of the same member and formed integrally with the holding body 25, and this and the switching means 29 are integrally formed via the wiring board 28, The plurality of fixed contacts 24 can be positioned with high precision, and the fixed contacts 24 and the switching means 29 can be easily formed, and the switch can be easily assembled.

  Further, as shown in FIG. 2, the fixed portion 24B at the lower end of the fixed contact 24 protrudes from the side surface of the holding body 25 and is integrally formed, whereby a connector, a lead wire or the like is attached to the connector terminal 26 protruding from the bottom surface of the case 21. At this time, even if a slightly large force is applied, this load is received by the side surface of the holding body 25 in which the fixing portion 24B is inserted and is not applied to the connection terminal 27 or the wiring board 28. It is possible to securely maintain the electrical connection.

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

Sectional drawing of the switch for vehicles by one embodiment of this invention Exploded perspective view Same circuit diagram Cross section during the same operation Cross section during the same operation Sectional view of a conventional vehicle switch

Explanation of symbols

DESCRIPTION OF SYMBOLS 21 Case 22 Actuator 22A Operation part 23 Driver 24 Fixed contact 24A Bending part 24B Fixed part 25 Holding body 26, 26A, 26B, 26C Connector terminal 27, 27A, 27B, 27C, 27D Connection terminal 28 Wiring board 29 Switching means 29A MOS-FET
29B Overcurrent detection IC
30 Movable Contact 30A Arm 30B Contact 31 Spring 32 Spacer 33 Cover 33A Hollow Tube 34 Battery 35 Stop Lamp

Claims (3)

A substantially box-shaped case with an opening on the top surface, a substantially L-shaped or substantially U-shaped fixed contact disposed in the case, a driving body housed in the case so as to be movable up and down, and the drive One end of the arm portion is held on the body and a contact portion is formed on the other end, and switching means that performs electrical switching according to the contact and separation of the movable contact and the fixed contact. A vehicle switch in which the contact portion comes into contact with the fixed contact after the arm portion comes into contact with the fixed contact. The vehicle switch according to claim 1, wherein a gap is provided between the movable contact and the fixed contact when the movable contact and the fixed contact are separated. 2. The vehicle switch according to claim 1, wherein the fixed contact and the switching means are integrally formed through a wiring board.

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