JP2015103495A - Ignition switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ignition switch in which a plurality of contact points are provided according to the magnitude of current flowing therethrough, thereby enabling switching of contact points according to the magnitude of current flowing therethrough.SOLUTION: The ignition switch has a contact point mechanism comprising: fixed contact point parts provided at the center part of a circle and an outer peripheral part thereof; and a movable contact point part turning with the center of the circle as a reference. The fixed contact point parts provided at the outer peripheral part include a plurality of contact point parts which are separated from each other in a circumferential direction.

Description

  The present invention relates to an ignition switch, and more particularly to an ignition switch having a configuration in which a plurality of contacts are provided according to the magnitude of a flowing current and the contacts can be switched according to the magnitude of the flowing current.

  The ignition switch is used to switch the power of the key and start the engine when the key rotation operation is transmitted to the switch. The ignition switch is in rotation contact with the fixed contact group on which the fixed contact group is disposed and the fixed contact group. It has a structure having a rotor in which a movable contact is disposed, and a cylindrical housing that is attached to a fixed contact base so as to cover the movable contact and the rotor (see, for example, Patent Document 1). ).

  Conventionally, this type of ignition switch generally has a contact structure using a copper material at a high contact pressure in order to switch a large current. In recent years, with changes in the functions of vehicle control systems, it has been desired to switch not only large currents but also small currents as conventional ignition switch functions.

JP-A-9-209888

  Here, a switch used for switching a small current of several mA level needs to be plated for the purpose of preventing oxidation of the contact. However, even if the plating process is performed, an arc is generated at the time of switching from the large current contact, and there is a problem that the plating is peeled off.

  In addition, it is necessary to increase the contact load in a large current contact, and therefore there is a problem that it is necessary to change the contact load between a large current contact and a small current contact. Further, since the contact point has a function of starting the engine of the vehicle, the contact point is required to have high durability. However, at a high contact load at a large current, there is a problem that the plating is peeled off due to deterioration of durability.

  Therefore, in view of the above-described problems, the present invention provides an ignition having a configuration in which a plurality of contacts are provided according to the magnitude of the flowing current, and the contacts can be switched according to the magnitude of the flowing current. The object is to provide a switch.

  The present invention proposes the following matters in order to solve the above problems.

  (1) The present invention is an ignition switch having a contact mechanism including a fixed contact portion provided at a circular center portion and an outer peripheral portion thereof, and a movable contact portion rotating with respect to the circular center. The ignition switch is characterized in that the fixed contact portion provided on the outer peripheral portion includes a plurality of contact portions spaced in the circumferential direction.

  According to the present invention, since the fixed contact portion provided on the outer peripheral portion includes a plurality of contact portions spaced apart in the circumferential direction, the plating can be performed by selecting the contacts individually according to the magnitude of the current to be switched. It is possible to deal with problems such as peeling.

  (2) The present invention proposes an ignition switch characterized in that the ignition switch of (1) is widened in accordance with the magnitude of current flowing through the radial width area of the plurality of contact portions.

  According to the present invention, a design that contributes to a high durability requirement is possible by increasing the radial area according to the magnitude of the current flowing through the areas of the plurality of contact portions.

  (3) In the ignition switch of (1) or (2), the present invention forms a difference in height between the contact of the fixed contact portion at the center of the circle and the contacts of the plurality of contact portions, and the magnitude of the flowing current Accordingly, an ignition switch is proposed in which the contact pressure of the movable contact portion with respect to the fixed contact portion is increased.

  According to the present invention, the height difference between the contact of the fixed contact portion at the center of the circle and the contact of the plurality of contact portions is formed, and the contact pressure of the movable contact portion to the fixed contact portion according to the magnitude of the flowing current. Is formed to be large. That is, the greater the current to be switched, the greater the difference in height from the contact of the fixed contact portion at the center of the circle, so the contact pressure of the movable contact portion to the fixed contact portion can be increased, and the magnitude of the current to be switched A corresponding contact load can be realized.

  According to the present invention, since the fixed contact portion provided on the outer peripheral portion includes a plurality of contact portions separated in the circumferential direction, the plating is performed by selecting the contact individually according to the magnitude of the current to be switched. There is an effect that it is possible to cope with a problem such as peeling.

  Further, by increasing the radial width area according to the magnitude of the current flowing through the areas of the plurality of contact portions, there is an effect that a design that contributes to a high durability requirement can be achieved.

  Further, a height difference is formed between the contact of the fixed contact portion of the circular center portion and the contacts of the plurality of contact portions, and the contact pressure of the movable contact portion to the fixed contact portion increases according to the magnitude of the flowing current. It is formed as follows. That is, the greater the current to be switched, the greater the difference in height from the contact of the fixed contact portion at the center of the circle. Therefore, the contact pressure of the movable contact portion to the fixed contact portion can be increased, and the magnitude of the current to be switched is increased. A corresponding contact load can be realized.

It is an exploded view of the ignition switch which concerns on embodiment of this invention. It is AA sectional drawing of the contact mechanism part at the time of the large current switching which concerns on embodiment of this invention. It is the perspective view which looked at the contact mechanism part at the time of the large current switching which concerns on embodiment of this invention from the upper part. It is sectional drawing of the fixed contact part for small currents and the fixed contact part for large currents concerning embodiment of this invention. It is BB sectional drawing of the contact mechanism part at the time of the small electric current switching which concerns on embodiment of this invention. It is the perspective view which looked at the contact mechanism part at the time of the small electric current switching which concerns on embodiment of this invention from the upper part.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
Note that the constituent elements in the present embodiment can be appropriately replaced with existing constituent elements and the like, and various variations including combinations with other existing constituent elements are possible. Therefore, the description of the present embodiment does not limit the contents of the invention described in the claims.

  The ignition switch according to the embodiment of the present invention will be described with reference to FIGS. In this embodiment, the case where two fixed contact portions for switching are provided will be described as an example. However, the case where there are two or more fixed contact portions can be realized based on the following description.

<Main configuration of ignition switch>
As shown in FIG. 1, the ignition switch according to the embodiment of the present invention generally includes a terminal base assembly 10, a contact plate 20, a contact spring 30, a rotor 40, a steel ball 50, an action spring 60, and a return. A spring 70 and a switch case 80 are included.

  For example, as shown in FIG. 3, the terminal base Assy 10 is provided at the center of the circle, and is always provided at the outer peripheral portion of the first fixed contact portion 11 that is in contact with the movable contact portion. A second fixed contact portion 12 and a third fixed contact portion 13 that are spaced apart from each other are provided. That is, since the second fixed contact portion 12 and the third fixed contact portion 13 are arranged to be separated from each other in the circumferential direction, by selecting the contacts individually according to the magnitude of the current to be switched. It is possible to cope with problems such as plating peeling.

  The contact plate 20 is a member that forms a movable contact portion, and rotates based on the circular center of the terminal base Assy 10. The contact plate 20 is always in elastic contact with the first fixed contact portion 11 by the contact spring 30 disposed between the terminal base Assy 10 and the rotor 40, and is rotated to move the second fixed contact. It is in elastic contact with the part 12 or the third fixed contact part 13.

  The rotor 40 is supported so as to be movable with respect to the terminal base Assy 10, and is rotatably supported by the terminal base Assy 10 and a switch case 80 described later.

  The rotor 40 is provided with a key hole 40a to which a key cylinder (not shown) into which an ignition key (not shown) for rotating the rotor 40 is inserted can be connected.

  Further, at two locations in the diameter direction of the peripheral surface of the rotor 40, when the rotor 40 rotates, a click feeling is generated in cooperation with a plurality of projections (not shown) formed on the inner peripheral wall of the switch case 80 described later. A ball 50 for caulking is elastically disposed by a spring 60 in the bottom hole 40b for ball disposition.

  The return spring 70 is a spring for restoring the rotor 40 from the START position to the ON position. The switch case 80 is attached to the terminal base Assy 10 so as to cover the rotor 40.

  In the ignition switch configured as described above, the rear end portion of the key cylinder into which the ignition key is inserted is inserted into the key hole 40a, and the rotor 40 is rotated integrally with the key cylinder. At each of the ACC position, the ON position, and the START position, the movable contact portion comes into contact with the second fixed contact portion 12 and the third fixed contact portion 13 so that predetermined electrical conduction is performed. It is configured. In the present embodiment, the second fixed contact portion 12 is electrically connected to the LOCK position, the ACC position, and the ON position, and the third fixed contact portion 13 is electrically connected to the START position.

  In addition, the steel ball 50 generates a click feeling when it climbs over a plurality of protrusions formed on the inner peripheral wall of the switch case 80 so that the operator can detect the LOCK position, the ACC position, the ON position, and the START position. It is configured.

<Configuration and operation of fixed contact part>
2 is a cross-sectional view taken along line AA of the contact mechanism section when switching a large current, FIG. 3 is a perspective view of the contact mechanism section when switching a large current, as viewed from above, and FIG. It is sectional drawing of a stationary contact part and a stationary contact part for large currents.

  As shown in FIG. 2, the contact plate (movable contact) 20 is shown to be in elastic contact with the first fixed contact portion 11 and the second fixed contact portion 12 that are always in contact by the contact spring 30. ing. That is, FIG. 2 shows a case where the contact plate (movable contact) 20 rotates clockwise and has a positional relationship as shown in FIG.

  Here, the second fixed contact portion 12 is a contact for large current, and the third fixed contact portion 13 is a contact for small current, and the second fixed contact portion 12 and the third fixed contact portion. As shown in FIG. 3, the width area 13 in the radial direction is formed widely according to the magnitude of the flowing current. Thereby, the design which contributed to the request | requirement of high durability is attained.

  Further, the heights of the first fixed contact portion 11, the second fixed contact portion 12, and the third fixed contact portion 13 are set according to the magnitude of the flowing current, as shown in FIG. The contact pressure with respect to the fixed contact portions 12 and 13 is formed to be high. That is, as the current to be switched increases, the difference in height from the contact of the fixed contact portion at the center of the circle increases, so that the contact pressure can be maintained without changing the contact spring 30 of the contact plate 20 as shown in FIG. The contact load according to the magnitude of the current to be switched can be realized with a simple configuration.

  Furthermore, as shown in FIG. 2, when the contact plate 20 is in contact with the second fixed contact 12, the contact surface 20a that comes into contact with the third fixed contact 13 in FIG. ing. Thereby, it is possible to prevent the contact surface 20a from being worn while the third fixed contact 13 and the contact surface 20b of the contact plate 20 are in contact with each other.

  FIG. 5 is a BB cross-sectional view of the contact mechanism section at the time of switching a small current, FIG. 6 is a perspective view of the contact mechanism section at the time of switching a small current as viewed from above, and FIG. It is sectional drawing of a stationary contact part and a stationary contact part for large currents.

  As shown in FIG. 5, the contact plate (movable contact) 20 is shown to be in elastic contact with the first fixed contact portion 11 and the second fixed contact portion 12 that are always in contact by the contact spring 30. ing. That is, FIG. 5 shows a case where the contact plate (movable contact) 20 rotates clockwise and has a positional relationship as shown in FIG.

  Here, the second fixed contact portion 12 is a contact for large current, and the third fixed contact portion 13 is a contact for small current, and the second fixed contact portion 12 and the third fixed contact portion. As shown in FIG. 6, the width area 13 in the radial direction is widely formed according to the magnitude of the flowing current. Thereby, the design which contributed to the request | requirement of high durability is attained.

  Further, as shown in FIG. 4, the heights of the first fixed contact portion 11, the second fixed contact portion 12, and the third fixed contact portion 13 are increased according to the magnitude of the flowing current. It is formed as follows. That is, as the current to be switched increases, the difference in height from the contact of the fixed contact portion at the center of the circle increases, so that the contact pressure between the fixed contact portion and the movable contact portion remains high while maintaining the same contact spring 30. As shown in FIG. 5, a contact load corresponding to the magnitude of the current to be switched can be realized with a simple configuration.

  The embodiments of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to the embodiments, and includes designs and the like that do not depart from the gist of the present invention. For example, in the present embodiment, the case where two fixed contact points for switching are provided is described as an example, but two or more fixed contact points for switching may be provided.

10; Terminal Base Assy
DESCRIPTION OF SYMBOLS 11; 1st fixed contact part 12; 2nd fixed contact part 13; 3rd fixed contact part 20; Contact plate 30; Contact spring 40; Rotor 40a: Key hole 40b; Steel ball 60; Action spring 70; Return spring 80; Switch case

Claims (3)

An ignition switch having a contact mechanism including a fixed contact portion provided at a circular center portion and an outer peripheral portion thereof, and a movable contact portion rotating with respect to the center of the circle,
The ignition switch according to claim 1, wherein the fixed contact portion provided on the outer peripheral portion includes a plurality of contact portions spaced apart in the circumferential direction.   2. The ignition switch according to claim 1, wherein a radial width area is increased in accordance with a magnitude of a current flowing through an area of the plurality of contact portions.   A height difference is formed between the contact of the fixed contact portion of the circular center portion and the contacts of the plurality of contact portions, so that the contact pressure of the movable contact portion to the fixed contact portion increases according to the magnitude of the flowing current. The ignition switch according to claim 1 or 2, wherein the ignition switch is formed as follows.

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