JPH0849456A - Key cylinder device - Google Patents

Abstract

PURPOSE:To restrain the output of a primary coil from decreasing in a device in which the primary coil is provided in the coil mounting portion of a key cylinder main body. CONSTITUTION:A bobbin 12 on which a primary coil 16 is wound is mounted in a coil mounting portion 11 provided at the front of a key cylinder main body 1. First 19 and second 20 sheets each made of a magnetic substance are affixed, respectively, to the outer peripheral face of the cylindrical portion 13 and the rear face of the rear flange 15 of the bobbin 12. When a current is passed through the primary coil 16, the magnetic flux of the primary coil 16 passes through the first and second magnetic substance sheets 19, 20 and is restrained from acting on a rotor case 2 and a rotor case 4,both of which are conductors. Therefore, generation of an eddy current on the side of the key cylinder main body 1 due to the magnetic flux is restrained, and the output of the primary coil 16 can be restrained from decreasing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a key cylinder device having a structure in which a primary coil is mounted on a front portion of a key cylinder body into which a key having a secondary coil is inserted.

[0002]

2. Description of the Related Art In recent years, some automobiles are equipped with a so-called wireless door lock device. This wireless door lock device is generally provided with a transmitter circuit and a battery as a power source for the transmitter circuit at the base of the key to be inserted into the ignition key cylinder and the door key cylinder.
When a user emits a radio signal by activating its transmission circuit, the receiver provided on the vehicle body receives the radio signal, and the reception signal discrimination means decodes the radio signal and receives the radio signal. Is a specific signal set for the vehicle, the electric actuator is operated to automatically lock the door, or the lock is automatically released.

By the way, in such a wireless door lock device, when the battery of the key is depleted and the power runs out, the radio signal cannot be emitted, and the lock operation and the unlock operation by the radio signal cannot be performed. There is a problem called.

Therefore, the present inventors have considered the following structure. That is, while a primary coil is provided on the ignition key cylinder side, a secondary battery that can charge the battery of the key is used and a secondary coil is provided on the key, and the key is inserted into the ignition key cylinder and rotated. , When the engine is started, the primary coil is energized to change its current, and based on the change of the current flowing in this primary coil, an induced electromotive force is generated in the secondary coil on the key side by the electromagnetic induction action, The secondary battery of the key is charged based on this electromotive force.
With such a configuration, the secondary battery of the key can be charged while the engine is being driven.

[0005]

However, in the above structure, when the primary coil is energized, the magnetic flux generated by the primary coil is attached to the metal rotor case or rotor, which is a conductor in the key cylinder, or the key cylinder. There is a problem that an eddy current is generated by interlinking the locked body, which causes the output of the primary coil to weaken.

Therefore, an object of the present invention is to provide a key cylinder device in which the primary coil is provided in the front part of the key cylinder body and in which a decrease in the output of the primary coil can be suppressed.

[0007]

In order to achieve the above-mentioned object, the present invention provides a key cylinder main body into which a key having a secondary coil is inserted, and a coil mounting provided on the front portion of the key cylinder main body. And a primary coil mounted on the coil mounting part, wherein the secondary coil produces an induced electromotive force based on a change in current flowing through the primary coil. A magnetic material sheet made of an amorphous magnetic material is interposed between the primary coil and the primary coil.

In this case, in the case where the coil mounting portion has an annular wall located on the outer peripheral portion of the key cylinder body and an annular collar portion projecting laterally from the rear end portion of the annular wall, The magnetic material sheet is preferably interposed between the outer peripheral surface of the annular wall and the primary coil and between the front surface of the collar portion and the primary coil.

Further, when the coil mounting portion is composed of an annular wall located on the outer peripheral portion of the key cylinder body, the magnetic material sheet is interposed between the outer peripheral surface of the annular wall and the primary coil.

[0010]

According to the above-mentioned means, when the primary coil is energized, the magnetic flux from the primary coil passes through the magnetic material sheet, and accordingly, the magnetic flux can be minimized from acting on the key cylinder body side. Along with this, it is possible to suppress the generation of eddy current due to the magnetic flux on the key cylinder body side, and it is possible to suppress the decrease in the output of the primary coil.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment in which the present invention is applied to an ignition key cylinder device will be described with reference to FIGS.
Will be described with reference to. First, in FIG. 1, a key cylinder main body 1 includes a rotor case 2, a rotor 4 rotatably housed in a rotor housing portion 3 of the rotor case 2, and an outer peripheral portion of a front portion of the rotor case 2. It is composed of the attached cover 5. The rotor case 2 and the rotor 4 are made of zinc.

A key insertion opening 6 (see FIG. 2) extending in the axial direction of the rotor 4 is formed, and a plurality of tumblers (not shown) are movably disposed inside the rotor 4. . As is well known, when a regular key 7 is inserted into the key insertion opening 6, the rotor 4 is moved so that each tumbler is housed in the rotor 4 and is allowed to be rotated. When a key other than the regular key is inserted, a part of the tumbler is projected to the outside of the rotor 4 so that it cannot rotate. Further, behind the rotor 4, an ignition switch (not shown) that is operated according to the rotation of the rotor 4 is provided.

On the outer peripheral portion of the front portion of the rotor case 2,
A brim portion 8 protruding laterally is provided so as to project. The cover 5 includes a cylindrical annular wall 9 provided so as to cover the outer peripheral portion of the rotor case 2, and a flange portion 10 provided so as to cover the flange portion 8 of the rotor case 2 from the front. It has an integrally formed stepped tubular shape, and the annular wall 9 and the collar portion 10 constitute an annular coil mounting portion 11.

An annular plastic bobbin 12
As shown in FIG. 3, the cylindrical portion 13 and the cylindrical portion 1
3 has a structure in which a front flange portion 14 and a rear flange portion 15 that are provided at the front portion and the rear portion of 3 are provided so as to project laterally, and the primary coil 16 is wound around the outer peripheral portion of the cylindrical portion 13. It has been turned. The bobbin 12 around which the primary coil 16 is wound.
Is mounted on the coil mounting portion 11 and covers the cover 5
It is covered from the outside by a front cover 17 attached to the front part of the. As shown in FIG. 2, on the front surface of the front cover 17, characters for indicating the rotational position of the rotor 4 (state of the ignition switch), “LOCK”, “ACC”,
"ON" and "START" are displayed. The lead wire 18 connected to the primary coil 16 has a front cover 17
Is derived from the outside.

Here, of the hobbin 12, the cylindrical portion 1
As shown in FIG. 4, a first magnetic material sheet 19 made of a band-shaped amorphous magnetic material is attached to the outer peripheral surface of the adhesive sheet 3 by adhesion, and the rear surface of the rear flange portion 15 is shown in FIG. Made of C-shaped amorphous magnetic material
The magnetic material sheet 20 is attached by adhesion.

These first and second magnetic material sheets 1
Although 9 and 20 have different shapes, they have the same structure, and have a multilayer structure as shown in FIG. Specifically, the first and second magnetic material sheets 19 and 20 are
From the outer surface side, a polyester sheet 21 for insulation,
The adhesive layer 22, the amorphous magnetic material layer 23, the adhesive transfer tape layer 24, and the release paper 25 are formed. The release paper 25 is peeled off to remove the adhesive transfer tape layer 24.
Is adhered to the bobbin 12 side so as to be attached to the bobbin 12. In addition, the first and second in the present embodiment
Each of the magnetic material sheets 19 and 20 including the release paper 25 has a thickness of about 0.5 mm.

In this case, however, the first portion is provided between the outer peripheral surface of the annular wall 9 of the coil mounting portion 11 and the primary coil 16.
The magnetic material sheet 19 is interposed, and the second magnetic material sheet 20 is interposed between the front surface of the collar portion 10 and the primary coil 16.

On the other hand, a base portion 7a serving as a grip portion of the key 7
The secondary coil 26, a rechargeable secondary battery 27, an oscillator circuit (not shown) using the secondary battery 27 as a power source, a switch operation button 28 for oscillating the oscillator circuit, and the like are incorporated. In response to the operation of the operation button 28, a radio wave signal is emitted from the transmission circuit.

Now, in the structure described above, the key 7 is inserted into the key insertion opening 6 of the rotor 4, and the rotor 4 is rotated from the "LOCK" position in the direction of arrow A in FIG. When it is rotated to the position, the engine is started via a starter (not shown). When the key 7 is released, the rotor 4 is automatically returned to the "ON" position.

Here, a control device (not shown) provided on the vehicle side energizes the primary coil 16 and controls it when the engine is started. This primary coil 1
Based on the change in the current flowing in 6, the induced electromotive force is generated in the secondary coil 26 on the key 7 side by the electromagnetic induction action, and the secondary battery 27 of the key 7 is generated based on this electromotive force.
Will be charged.

At this time, since the first and second magnetic material sheets 19 and 20 are arranged between the primary coil 16 and the coil mounting portion 11 on the side of the key cylinder body 1, the magnetic flux generated by the primary coil 17 is The first and second magnetic material sheets 19 and 20 are passed through, and accordingly, the magnetic flux can be reduced as much as possible from acting on the side of the rotor case 2 and the rotor 4 which are conductors. Along with this, generation of eddy current due to magnetic flux on the key cylinder body 1 side can be suppressed, reduction in output of the primary coil 16 can be suppressed, and the magnetic flux of the primary coil 16 can be reduced to the secondary coil 26 on the key 7 side. Can be effectively acted upon.

Further, according to this embodiment, since the first and second magnetic material sheets 19 and 20 are thin and flexible,
There is an advantage that it can be easily attached to a curved surface such as the cylindrical portion 13 of the bobbin 12.

Further, when the first magnetic material sheet 19 is wound around the outer peripheral surface of the cylindrical portion 13, even if both end portions of the first magnetic material sheet 19 overlap each other, insulation is provided between the both end portions. Since the polyester sheet 21 for the purpose is interposed, the closed loop of the amorphous magnetic material layer 23 is not formed, and the eddy current can be prevented from flowing through the first magnetic material sheet 19. Further, since the second magnetic material sheet 20 is formed in a C shape, it is possible to prevent eddy currents from flowing through the second magnetic material sheet 20 as well.

FIG. 7 shows a second embodiment of the present invention. This second embodiment differs from the above-mentioned first embodiment in the following points. That is, in the second embodiment, there is no portion corresponding to the collar portion 8 on the rotor case 2 side of the key cylinder body 1. Further, the cover 29 has the annular wall 30, but does not have the flange portion. The annular wall 30 constitutes a coil mounting portion 31, and the annular wall 30
The bobbin 12 around which the primary coil 16 is wound is attached to the outer peripheral portion of the.

Then, in the bobbin 12, the cylindrical portion 13
Although the first magnetic material sheet 19 is attached to the outer peripheral surface of the, the second magnetic material sheet is not attached to the rear flange portion 15. The bobbin 12 is covered with a front cover 17.

In the second embodiment as described above, it is possible to obtain the same effects as those of the first embodiment. In the second embodiment, the rear collar portion 15 of the bobbin 12 is
In addition, as in the first embodiment, the second magnetic material sheet 20 may be attached.

The present invention is not limited to the above-mentioned embodiments, but can be modified or expanded as follows. The present invention is not limited to the key cylinder device for ignition, but can be applied to the key cylinder device for doors.

The present invention can also be applied to a case where power is supplied from the key cylinder device side to the transponder provided in the key in the immobilizer.

The immobilizer is an ID code transmitted from the transponder provided on the key to the vehicle body.
If the ID code does not match a predetermined code, the engine start is invalidated. In addition, the transponder is a relay device that is supplied with power from a primary coil provided in the key cylinder device by electromagnetic induction, and transmits a predetermined ID code to the vehicle body side when a constant voltage is reached.

[0030]

As is apparent from the above description, according to the present invention, the coil mounting portion is provided at the front portion of the key cylinder body into which the key having the secondary coil is inserted, and the coil mounting portion is provided. In the key cylinder device in which the primary coil is mounted, by interposing the magnetic material sheet made of an amorphous magnetic material between the coil mounting portion and the primary coil, the magnetic flux of the primary coil acts on the key cylinder body side. It can be reduced as much as possible, a decrease in the output of the primary coil can be suppressed, and the magnetic flux can effectively act on the secondary coil side. Further, since the magnetic material sheet is flexible, there is an advantage that it can be easily attached to a curved portion.

[Brief description of drawings]

FIG. 1 shows a first embodiment of the present invention, and is a side view showing a cutaway view of essential parts in a state where a key is inserted.

FIG. 2 is a front view

FIG. 3 is a vertical sectional side view of a hobbin wound with a primary coil.

FIG. 4 is a plan view of a first magnetic material sheet.

FIG. 5 is a plan view of a second magnetic material sheet.

FIG. 6 is an enlarged vertical side view of a magnetic material sheet.

FIG. 7 is a cutaway side view of an essential part showing a second embodiment of the present invention.

[Explanation of symbols]

1 is a key cylinder main body, 2 is a rotor case, 4 is a rotor, 5 is a cover, 7 is a key, 9 is an annular wall, 10 is a collar portion,
Reference numeral 11 is a coil mounting portion, 12 is a bobbin, 16 is a primary coil, 19 is a first magnetic material sheet, 20 is a second magnetic material sheet, 23 is an amorphous magnetic material layer, 26 is a secondary coil, and 27 is a secondary coil. A secondary battery, 29 is a cover, 30 is an annular wall, and 31 is a bobbin mounting portion.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshiyuki Mizuno Noda No. 1 in Oita-machi, Niwa-gun, Aichi Prefecture Toda Rika Electric Co., Ltd. (72) Inventor Shinichi Koga Oguchi-machi, Niwa-gun, Aichi Prefecture Toyota character Noda No. 1 Tokai Rika Electric Co., Ltd.

Claims (3)

[Claims] 1. A key cylinder body into which a key having a secondary coil is inserted, a coil mounting portion provided at a front portion of the key cylinder body, and a primary coil mounted to the coil mounting portion. In a key cylinder device configured to generate an induced electromotive force in the secondary coil based on a change in current flowing in the primary coil, a magnetic material sheet made of an amorphous magnetic material between the coil mounting portion and the primary coil. A key cylinder device characterized by interposing. 2. The coil mounting portion is configured to have an annular wall located on the outer peripheral portion of the key cylinder body, and an annular collar portion projecting laterally from the rear end portion of the annular wall, and a magnetic material sheet. 2. The key cylinder device according to claim 1, wherein the key cylinder device is interposed between the outer peripheral surface of the annular wall and the primary coil, and between the front surface of the collar portion and the primary coil, respectively. 3. The coil mounting portion is composed of an annular wall located on the outer peripheral portion of the key cylinder body, and the magnetic material sheet is interposed between the outer peripheral surface of the annular wall and the primary coil. The key cylinder device according to claim 1.