JPH074730U - Key cylinder device - Google Patents

Abstract

(57) [Abstract] [Purpose] To detect the presence or absence of a key electrically with a relatively simple configuration, and to improve the detection accuracy. [Structure] The shutter 7 made of a magnetic material is biased in a closing direction by a spring member 10. When the shutter 7 is closed, the reed switch 15 is turned off by the magnetic flux of the permanent magnet 11. When the key 20 is inserted and the shutter 7 is rotated to the open position, the permanent magnet 11 is covered by the shutter 7, the magnetic flux of the permanent magnet 11 concentrates on the shutter 7, and the magnetic flux to the reed switch 15 is cut off. The reed switch 15 is turned on. At this time, since the spring member 10 is made of a non-magnetic material, the spring member 10 does not affect the magnetic flux acting on the reed switch 15 from the permanent magnet 11.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a key cylinder device having a function of detecting the presence or absence of a key.

[0002]

[Prior art]

 2. Description of the Related Art Conventionally, for example, in a key cylinder device for a door of an automobile, a device in which a key is inserted into and removed from the rotor of the key cylinder, that is, a device for electrically detecting the presence or absence of the key is not put into practical use.

[0003]

[Problems to be solved by the device]

 Since this type of key cylinder device is particularly exposed to the outside of the vehicle, it is easily affected by the external environment, and it is generally difficult to provide a device that electrically detects the presence or absence of a key. Further, even if such a device can be provided, there is a problem that the structure becomes complicated or becomes large in size.

In view of such circumstances, the present inventors have considered the following configuration. That is, the main body of the key cylinder device is generally configured by rotatably providing a rotor having a key insertion opening in a rotor case. Of these, a rotor for opening and closing the key insertion opening is rotatably provided on the rotor, and a spring member for urging the shutter in the closing direction is provided, and the permanent magnet is placed near this spring member. Set up. On the other hand, the rotor case is provided with a reed switch as a magnetic detection element at a portion where the magnetic flux of the permanent magnet acts on the rotor case when the shutter is closed. At this time, the shutter is made of a magnetic material.

In this configuration, when the key is not inserted into the key insertion opening, the shutter is in the closed position, the magnetic flux of the permanent magnet acts on the reed switch, and the reed switch is in the off state, for example. Has become.

In this state, when the key is inserted into the key insertion opening, the shutter is rotated to the open position against the urging force of the spring member, and accordingly, the shutter comes close to the permanent magnet and the permanent magnet. Flux concentrates on the shutter, the magnetic flux to the reed switch of the permanent magnet is cut off, and the reed switch is turned on.

As described above, the magnetic flux of the permanent magnet that acts on the reed switch changes according to the opening and closing of the shutter. By detecting this change, it is possible to electrically detect the presence or absence of the key.

By the way, in the above-mentioned configuration, a piano wire is formed into a torsion coil spring and used as the spring member for urging the shutter in the closing direction. However, since the piano wire is generally made of a magnetic material and the spring member is arranged in the vicinity of the permanent magnet, the magnetic flux from the permanent magnet easily passes through the spring member. For this reason, especially when the shutter is in the closed state, if a large amount of magnetic flux from the permanent magnet passes through the spring member, the magnetic flux that acts on the reed switch side will decrease, and as a result, the reed switch with respect to opening and closing of the shutter There is a problem that the change in magnetic flux becomes small and the detection accuracy of the presence / absence of a key decreases.

Therefore, an object of the present invention is to provide a key cylinder device capable of electrically detecting the presence / absence of a key with a relatively simple structure and improving the detection accuracy.

[0010]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, a key cylinder device of the present invention has a rotor case, a rotor having a key insertion opening, and a rotor rotatably provided in the rotor case, and the key insertion device in the rotor. A permanent magnet located near the mouth, a magnetic detection element provided on the rotor case so that the magnetic flux from the permanent magnet acts, and a rotor for opening and closing the key insertion opening on the rotor. A shutter made of a magnetic material, which is movably provided and shuts off a magnetic flux from the permanent magnet to the magnetic detection element in response to being rotated to an open position by a key inserted into a key insertion opening, and the rotor. And a spring member made of a non-magnetic material provided so as to urge the shutter in the closing direction.

In the above configuration, when the rotor cover is provided on the front surface of the rotor, it is preferable that the rotor cover is made of a non-magnetic material, and in the case where the rotor cover is provided with a case cover on the front surface. In addition, it is preferable that the case cover is made of a non-magnetic material.

[0012]

[Action]

 When the key is not inserted, the shutter is in the closed position, and the magnetic flux of the permanent magnet acts on the magnetic detection element. In this state, when the key is inserted into the key insertion opening, the shutter is rotated to the open position against the biasing force of the spring member, and accordingly, the shutter approaches the permanent magnet and the magnetic flux of the permanent magnet is generated. As it concentrates on the shutter, the magnetic flux of the permanent magnet with respect to the magnetic detection element is blocked.

As described above, the magnetic flux of the permanent magnet acting on the magnetic detection element changes according to the opening / closing of the shutter, and the presence or absence of the key can be electrically detected by detecting this change.

At this time, since the spring member that biases the shutter in the closing direction is made of a non-magnetic material, this spring member does not affect the magnetic flux acting on the magnetic detection element from the permanent magnet.

Further, the rotor cover mounted on the front surface of the rotor and the case cover mounted on the front surface of the rotor case are also made of a non-magnetic material so that the rotor cover and the case cover can detect the magnetism from the permanent magnets. The magnetic flux acting on the element can be prevented from being affected.

[0016]

【Example】

 An embodiment in which the present invention is applied to a key cylinder device for an automobile door will be described below with reference to the drawings. First, referring to FIGS. 1 to 3, a key cylinder body 1 attached to a door of an automobile is constructed by rotatably disposing a rotor 4 having a key insertion opening 3 in a rotor case 2 having a cylindrical shape. ing. The rotor case 2 and the rotor 4 are made of zinc which is a non-magnetic material.

A rotor cover 5 having a key insertion hole 5a communicating with the key insertion opening 3 is attached to the front surface of the rotor 4, and a plurality of tumbler grooves 6 are formed on the outer peripheral portion of the rotor cover 5. A tumbler (not shown) is movably arranged in correspondence with the tumbler groove 6. The rotor cover 5 is made of non-magnetic stainless steel.

A shutter 7 is provided inside the rotor 4 inside the rotor cover 5. Since this shutter 7 is made of magnetic stainless steel, it has side plates 8 integrally on both sides and is rotatably attached to the rotor 4 via shafts 9 provided at both ends. ing. The shutter 7 is configured to open and close the key insertion hole 5a and hence the key insertion opening 3 by its rotation, and the shutter 7 is closed by a spring member 10 formed of a torsion coil spring provided inside the rotor 4. It is urged toward. The spring member 10 is made of non-magnetic material such as beryllium copper.

Further, a permanent magnet 11 is arranged inside the rotor 4 so as to contact the spring member 10. The permanent magnet 11 is covered by the shutter 7 when the shutter 7 is rotated to the open position as shown by the chain double-dashed line in FIG.

On the other hand, a case cover 12 having a circular hole 12a in the center is attached to the front surface of the rotor case 2. Like the rotor cover 5, the case cover 12 is made of non-magnetic stainless steel.

Further, in the rotor case 2, a recess 13 having an opening on the rear surface side is formed so as to be located near the permanent magnet 11 in the rotor 4. A circuit board 14 is arranged in the concave portion 13, and a reed switch 15 as a magnetic detection element is arranged in the circuit board 14. Therefore, the reed switch 15 is arranged so as to be located near the permanent magnet 11. The circuit board 14 and the reed switch 15 are sealed with resin 16.

Further, on the outer peripheral portion of the rotor case 2, two lead wire holding portions 17 and 18 having a U-shape are integrally provided. As shown in FIG. 4, the lead wire holding portions 17 and 18 are arranged so as to face each other by being displaced in the axial direction of the rotor case 2, and the lead wires 19 led out from the circuit board 14 are connected to each other. It is supposed to hold.

Next, the operation of the above configuration will be described. When the shutter 7 is in the closed position (see the solid line in FIG. 1), the magnetic flux of the permanent magnet 11 acts on the reed switch 15, and the reed switch 15 is in the off state, for example.

In this state, when the key 20 is inserted into the key insertion opening 3 from the key insertion hole 5 a, the shutter 7 is rotated by the key 20 to the open position against the biasing force of the spring member 10. (See the chain double-dashed line in FIG. 1). Then, as the shutter 7 approaches the permanent magnet 11, both side plates 8 of the shutter 7 are positioned on both sides of the permanent magnet 11, and the shutter 7 is in a state of covering the permanent magnet 11.

When the shutter 7 is rotated to the open position in this way, the magnetic flux of the permanent magnet 11 concentrates on the shutter 7, the magnetic flux of the permanent magnet 11 with respect to the reed switch 15 is cut off, and the reed switch is turned off. The switch 15 is turned on.

In this case, when the regular key 20 is inserted into the key insertion opening 3, each tumbler (not shown) arranged in the rotor 4 is stored in the rotor 4. Therefore, the rotation of the rotor 4 is allowed, but when something other than the proper key is inserted, a part of the tumbler projects outward from the tumbler groove 6 to rotate the rotor 4. I can't.

According to the above-described embodiment, the magnetic flux of the permanent magnet 11 used for the reed switch 15 changes according to the opening / closing of the shutter 7. By detecting this change with the reed switch 15, the presence or absence of the key 20 is detected. Can be detected electrically.

At this time, since the spring member 10 for urging the shutter 7 in the closing direction is made of a non-magnetic material, the spring member 10 is provided in contact with the permanent magnet 11, but the spring member 10 is Therefore, the magnetic flux acting on the reed switch 15 from the permanent magnet 11 is not affected. Therefore, the detection accuracy of the reed switch 15 can be improved.

Further, in this embodiment, the rotor cover 5 mounted on the front surface of the rotor 4 and the case cover 12 mounted on the front surface of the rotor case 2 are made of a non-magnetic material, so that the rotor cover 5 and the case cover 12 can be prevented from affecting the magnetic flux acting on the lead switch 15 from the permanent magnet 11, so that the detection accuracy of the lead switch 15 can be further improved.

[0030]

[Effect of device]

 As is clear from the above description, according to the present invention, the magnetic flux of the permanent magnet acting on the magnetic detection element is changed according to the opening / closing of the shutter for opening / closing the key insertion opening, and this change is detected by the magnetic detection. Since the presence or absence of the key is detected by detecting with the element, the presence or absence of the key can be electrically detected with a relatively simple configuration. However, since the spring member that biases the shutter in the closing direction is made of a non-magnetic material, the detection accuracy of the magnetic detection element can be improved.

Further, the rotor cover mounted on the front surface of the rotor and the case cover mounted on the front surface of the rotor case are made of a non-magnetic material, so that the detection accuracy of the magnetic detection element can be further improved. .

[Brief description of drawings]

FIG. 1 is an enlarged cutaway side view of an essential part showing an embodiment of the present invention.

[Figure 2] Front view

[Fig. 3] Side view

FIG. 4 is a perspective view of a lead wire holding portion.

[Explanation of symbols]

1 is a key cylinder body, 2 is a rotor case, 3 is a key insertion port, 4 is a rotor, 5 is a rotor cover, 7 is a shutter,
Reference numeral 10 is a spring member, 11 is a permanent magnet, 12 is a case cover, 15 is a reed switch (magnetic detection element), and 20 is a key.

Continued Front Page (72) Inventor Yoshiyuki Mizuno No. 1 Noda, Toyota, Oguchi-cho, Niwa-gun, Aichi Prefecture Tokai Rika Electric Co., Ltd.

Claims (3)

[Scope of utility model registration request] 1. A rotor case, a rotor having a key insertion opening and rotatably provided in the rotor case, and a permanent magnet provided in the rotor in the vicinity of the key insertion opening. A magnetic detection element provided on the rotor case such that the magnetic flux from the permanent magnet acts thereon; and a rotor rotatably provided on the rotor so as to open and close the key insertion opening and inserted into the key insertion opening. A shutter made of a magnetic material that blocks a magnetic flux from the permanent magnet to the magnetic detection element in response to being rotated to an open position by a key, and the rotor is provided to urge the shutter in a closing direction. And a spring member made of a non-magnetic material. 2. The key cylinder device according to claim 1, wherein a rotor cover is provided on the front surface of the rotor, and the rotor cover is made of a non-magnetic material. 3. The key cylinder device according to claim 1, wherein a case cover is provided on the front surface of the rotor case, and the case cover is made of a non-magnetic material.