JP2004217146A - Case structure of immobilizer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a case structure of an immobilizer capable of providing favorable transmitting and receiving functions by restraining an influence on a telecommunication facility between an antenna coil and a transponder. <P>SOLUTION: This case structure is constituted of a cylinder part 14a with an annular antenna coil 13 installed on one end part and a case type part 14b projected and connected to the outer peripheral side of the other end part of this cylinder part 14a, the immobilizer unit 33 is formed by storing a control circuit substrate 32 in the case type part 14b, and a bolt mounting hole 53 for connection with other parts is formed on this case type part 14b. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a case structure of an immobilizer for preventing theft of an automobile.
[0002]
[Prior art]
The vehicle anti-theft immobilizer is composed of a main switch main body attached to the vehicle body, an annular antenna coil provided near the key insertion port of the main switch main body, a transponder built in the key shooting part, and this transponder. A control circuit for receiving and discriminating the transmitted ID code via the antenna coil. When an ID code is registered in the transponder and a key is inserted and turned on, an ID code signal is transmitted. This ID code signal is taken into the immobilizer unit via an antenna coil disposed around the key cylinder on the vehicle body side, and is collated and determined by the control circuit. If the verification result shows that the key is valid, the engine is permitted to start, and if the key is invalid, the engine is prohibited.
[0003]
A vehicle anti-theft device using such an immobilizer is disclosed in, for example, Patent Document 1.
[0004]
The antenna coil of the immobilizer receives the ID code signal from the transponder, forms a magnetic field by energizing the coil, and transmits electromagnetic energy serving as the power source to the transponder.
[0005]
When such an immobilizer is incorporated in a vehicle, an antenna coil is housed in an antenna case, a bolt mounting hole is provided in the antenna case, and the antenna case is fixed to a vehicle body frame via bolts and nuts.
[0006]
However, if the antenna case is provided with bolt mounting holes and fixed to the vehicle body frame, metal bolts are placed close to the antenna coil, which affects the communication function with the transponder and reduces the reception function or In addition, there is a problem that a sufficient magnetic field cannot be generated for generating electromagnetic energy, and power cannot be efficiently supplied to the transponder.
[0007]
[Patent Document 1]
JP 2001-71867 A
[Problems to be solved by the invention]
The present invention has been made in consideration of the above conventional technology, and has an object to provide a case structure of an immobilizer that can obtain a good transmission and reception function by suppressing an influence on a communication function between an antenna coil and a transponder. I do.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the present invention comprises a cylindrical portion having an annular antenna coil mounted on one end thereof, and a box-shaped portion protrudingly connected to the outer peripheral side of the other end of the cylindrical portion. An immobilizer case structure is provided, in which a control circuit board is accommodated in the box-shaped portion to form an immobilizer unit, and a bolt mounting hole for coupling with another component is formed in the box-shaped portion.
[0010]
According to this configuration, a compact immobilizer unit is formed by housing the antenna coil and the control circuit board in the case and integrating them, and the box-shaped portion of the case that is far from the antenna coil is formed. The other components are connected to each other via bolts, so the electromagnetic effect of the metal bolt on the antenna coil is reduced, and the effect on the communication function between the antenna coil and the transponder is suppressed, resulting in good transmission and reception functions. Is obtained.
[0011]
In a preferred configuration example, a connecting portion protruding on both sides of the box-shaped portion is provided, and the connecting bolt mounting hole is provided in the connecting portion.
[0012]
According to this configuration, since other components are coupled to the coupling portions protruding from both sides of the side surface of the box-shaped portion, the components can be reliably coupled in a well-balanced manner, and the coupling and assembling work can be easily performed.
[0013]
In a preferred configuration example, the main switch main body and the immobilizer unit are connected to each other by a bolt engaged in the coupling bolt mounting hole to form a collective assembly part including the immobilizer unit and the main switch main body. .
[0014]
According to this configuration, since the main switch body and the immobilizer unit are connected to form a collective assembly, the layout is compact and the handleability is improved, and the layout of the immobilizer unit can be efficiently performed in terms of space.
[0015]
In a preferred configuration example, the immobilizer unit is attached to an upper bracket that connects left and right front forks of a motorcycle.
[0016]
According to this configuration, the immobilizer unit is attached to the vehicle body using the upper bracket that connects the front fork, so that a compact layout can be realized in terms of space.
[0017]
In a preferred configuration example, the immobilizer unit is attached to the upper bracket by fixing the main switch body to the upper bracket with bolts.
[0018]
According to this configuration, the immobilizer unit can be compactly arranged around the upper bracket via the main switch body.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is an overall configuration diagram of an anti-theft system using an immobilizer according to the present invention. A main switch 11 is built in the main switch body 10, and a key insertion port 12 is formed on an end face thereof. A case 14 accommodating the antenna coil 13 is provided at a peripheral portion of an end face of the main switch body 10. The antenna coil 13 is an annular coil. The key 15 is inserted from the key insertion port 12, and the main switch 11 is turned on and off. The transponder 16 is embedded in the photographing section 17 of the key 15. An ID code is registered in the transponder 16. The transponder 16 receives electromagnetic energy from the antenna coil 13 as shown by an arrow P, and transmits an ID code signal as shown by an arrow Q using this as a power source. The ID code signal received by the antenna coil 13 is sent to the ID reading circuit 19 of the control circuit unit 18 of the immobilizer.
[0020]
The control circuit unit 18 is formed on one printed board (not shown). This printed board (control circuit board) is integrated with the antenna coil 13 in the case 14 to form an immobilizer unit. The immobilizer unit in which the antenna 13 in the case 14 and the printed board on which the control circuit unit 18 is formed is integrally (separated in the drawing) is further integrated with the main switch body 10 as described later. To form an integral part as an immobilizer / main switch assembly (assembly assembly).
[0021]
The control circuit unit 18 includes an ID reading circuit 19, a CPU 20, a power supply circuit 21, an ignition circuit 22, and an EEPROM 23. Note that the ignition circuit 22 may be separate.
[0022]
The ID reading circuit 19 reads the ID code signal received by the antenna coil 13 and controls energization of the coil for sending electromagnetic energy from the antenna coil 13 to the transponder 16.
[0023]
The CPU 20 compares the received ID code with a regular ID code registered in advance in the EEPROM 23 to determine whether the key 15 is a regular one or an illegally operated key. In accordance with this determination result, if the key is a legitimate key, the ignition of the engine 24 is permitted via the ignition circuit 22 and the engine 24 can be started. If the operation is illegal, the ignition of the engine by the ignition circuit 22 is prohibited, and the engine 24 cannot be started.
[0024]
The power supply circuit 21 receives a voltage from the battery 25 via the main switch 11 and supplies a predetermined voltage to each circuit in the control circuit unit 18 via the CPU 20. The power supply circuit 21 has a self-holding circuit (not shown) so as to continue operating for a certain period of time after the main switch 11 is turned off.
[0025]
The CPU 20 is connected to the alarm device 26 via an interface circuit (not shown). The alarm device 26 includes an inclination sensor 27 that detects the inclination and vibration of the vehicle, and an alarm 28 such as a siren or a lamp. When the vehicle leans or vibrates in the alert state (the anti-theft device is in an operable state), the inclination sensor 27 detects this and sounds the siren. The siren also sounds when the main switch is turned on in the alert state, but when the control circuit unit 18 determines that the key 15 is valid, the CPU 20 issues an alert release signal to the alarm device 26, and the siren is turned off. Prohibit noise.
[0026]
The CPU 20 is further connected to a meter 29 for displaying the operation state of the immobilizer (theft prevention device).
[0027]
FIG. 2 is a sectional view of the immobilizer unit according to the present invention.
The immobilizer unit 33 is obtained by mounting the above-described antenna coil 13 of FIG. 1 and the printed board 32 constituting the control circuit unit 18 in a case 14 and integrating them. The case 14 is an integrally molded resin body including a cylindrical portion 14a and a box-shaped portion 14b connected to an outer peripheral side of an end of the cylindrical portion 14a. The box-shaped portion 14b is open on the inner peripheral side as shown in FIG. 3 described later. An annular antenna coil 13 is mounted on the end of the cylindrical portion 14a opposite to the box-shaped portion 14b, with the axis C concentric. The printed board 32 is arranged and accommodated in the box-shaped portion 14b in parallel with the axis C.
[0028]
The antenna coil 13 and the printed board 14b are connected via a terminal member 35 formed by bending a metal plate. In this embodiment, the length a (substantially corresponding to the axial length of the cylindrical portion 14a) up to the bent portion of the terminal member 35 in the cylindrical portion 14a is bent toward the outer peripheral side of the terminal member 35. Is longer than the length b (substantially corresponding to the length of the box-shaped portion 14b protruding toward the outer periphery). Thus, when the immobilizer unit 33 is mounted on an upper bracket of a front fork, which will be described later, the immobilizer unit 33 can be efficiently mounted in a narrow space without causing interference of components.
[0029]
Bolt mounting holes 53 for coupling with other components are formed on both sides of the side surface of the box-shaped portion 14b.
[0030]
FIG. 3 is an exploded perspective view of the immobilizer unit of FIG.
The antenna coil 13 is wound around a resin-molded ring-shaped bobbin 36. Terminal members 35 are attached from both sides of a connecting piece 36a formed of a resin mold integral with the bobbin 36. Each terminal member 35 is formed with pin terminals 35a and 35b at the beginning and end of winding of the coil. After assembling the antenna coil 13 and the terminal member 35 wound around the bobbin 36, the assembly is set in a mold for molding the case 14 to form a molded molded body integral with the case 14. After the molding, the printed board 32 is fitted into the box-shaped portion 14b. At this time, the tip projection 35c of the terminal component 35 penetrates the hole provided in the printed board 32, and the tip projection 35c is soldered to fix the printed board 32 in the box-shaped portion 14b.
[0031]
A cable 38 is connected to the printed board 32 via a connector 37. The notch 39 for inserting the cable is formed at the lower end of the box-shaped portion 14 b of the case 14. An opening 40 for inserting and removing a key is formed at the center of the upper end surface of the cylindrical portion 14a of the case 14, and the key insertion port 12 is exposed when the main switch body 10 is assembled (see FIG. 5).
[0032]
The immobilizer unit 33 is connected to the main switch body 10 (see FIGS. 5 and 6) by bolts 34. The bolt 34 is screwed into a bolt mounting hole 53 of the connecting portion 14c integrally formed on both sides of the box-shaped portion 14b of the case 14 to connect the immobilizer unit 33 to the main switch body 10.
[0033]
FIGS. 4, 5, and 6 are a front view, a top view, and a side view, respectively, showing an assembly of the immobilizer and the main switch body according to the embodiment of the present invention.
As shown in FIGS. 2 and 3, the antenna coil 13 is accommodated in the case 14 by being embedded in, for example, a resin mold. The case 14 is provided with a printed board 32 constituting the control circuit unit 18 (FIG. 1) of the immobilizer. Thus, the case 14 in which the antenna coil 13 and the printed board 32 constituting the control circuit unit 18 are integrated by resin molding is formed as an immobilizer unit 33 of one component. The immobilizer unit 33 and the main switch body 10 made of metal are integrally connected by bolts 34 (FIG. 5) to form a one-piece immobilizer / main switch assembly (assembled assembly) 31. At this time, bolt mounting holes 53 are formed in the connecting portions 14c provided on both sides of the box-shaped portion 14b (see FIG. 3). The bolt 34 is inserted into a through hole 55 provided in the connecting piece 54 of the main switch body 10 and screwed into the bolt mounting hole 53. In this case, since the bolt mounting hole 53 is provided at a position away from the antenna coil 13 of the cylindrical portion 14a, the magnetic influence of the metal bolt 53 on the coil 13 is reduced.
Reference numeral 30 denotes a handle lock for preventing the steering shaft (not shown) of the handle from rotating in order to prevent the theft during parking of the motorcycle. As shown in FIGS. 4 and 5, the main switch body 10 is provided with a bolt insertion hole 48 for fixing the assembled assembly to a vehicle body (for example, an upper bracket for connecting a front fork of a front wheel).
[0034]
Since the bolt insertion hole 48 is provided at a position away from the antenna coil 13 of the cylindrical portion 14a, the magnetic influence of the metal bolt 49 (see FIG. 9) on the coil 13 is reduced.
[0035]
By thus integrating the main switch body 10, the antenna coil 13 and the printed circuit board 32 constituting the control circuit unit to constitute one collective assembly part, the handleability is improved and the parts management can be facilitated.
[0036]
FIG. 7 is a frame configuration diagram of a vehicle body front side portion of a motorcycle to which the collective assembly component of the present invention is attached.
A head pipe 42 is fixed to a main frame 41 constituting a front part of the vehicle body. A steering shaft 43 is rotatably inserted into the head pipe 42. An upper bracket 44 and an under bracket 45 are fixed to upper and lower ends of the steering shaft 43. Left and right front forks 46 are inserted into and fixed to the upper bracket 44 and the under bracket 45. The left and right front forks 46 are connected to both sides of the axle of a front wheel (not shown). The handlebar is fixed to the upper bracket 44, and the handle operation causes the upper bracket 44, the steering shaft 43, and the under bracket 45 integrated with the handlebar to rotate with respect to the head pipe 42 fixed to the vehicle body. As a result, the front fork 46 rotates with respect to the vehicle body together with the front wheels to change the direction. The upper bracket 44 is provided with a mounting hole 47 for mounting an immobilizer / main switch assembly component.
[0037]
8 and 9 are a plan view and a sectional view of the upper bracket according to the present invention, respectively.
A hole 51 for inserting and fixing the steering shaft is formed at the center of the upper bracket 44, and holes 50 for inserting and fixing the front fork are formed at both ends. The cylindrical portion 14 a of the immobilizer / main switch assembly (assembly component) 31 is fitted into the mounting hole 47 of the upper bracket 44, and is fixed with a bolt 49. The bolt 49 passes through a bolt insertion hole 48 of the main switch main body 10 and is screwed into a screw hole provided in a boss 52 (FIG. 9) integrally formed with the lower part of the upper bracket 44. Thus, the assembly (assembled assembly) 31 is fixed to the upper bracket 44. The configuration of the immobilizer / main switch assembly 31 is as shown in FIGS.
[0038]
【The invention's effect】
As described above, in the present invention, a compact immobilizer unit is formed by housing and integrating an antenna coil and a control circuit board in a case, and the case box is separated from the antenna coil. Since other parts are connected to the shape part via bolts, the electromagnetic effect of the metal bolt on the antenna coil is reduced, and the effect on the communication function between the antenna coil and the transponder is suppressed to achieve good transmission and A receiving function is obtained.
[0039]
Further, according to the configuration in which the connection portion is provided on both sides of the cylindrical portion side end portion of the box-shaped portion and the connection screw hole is provided in the connection portion, the connection portion is provided so as to protrude on both side surfaces of the box-shaped portion. Since the other parts are connected to the connected part, the parts can be connected reliably in a well-balanced manner, and the connecting and assembling work becomes easy.
[0040]
According to the configuration in which the main switch main body and the immobilizer unit are connected to each other by a bolt screwed into the coupling screw hole to form a collective assembly part including the immobilizer unit and the main switch main body, compactness and easy handling are improved. In addition, the layout of the immobilizer unit can be efficiently performed in terms of space.
[0041]
According to the configuration in which the immobilizer unit is attached to the upper bracket that connects the left and right front forks of the motorcycle, the immobilizer unit is attached to the vehicle body using the upper bracket that connects the front forks. A compact layout becomes possible.
[0042]
According to the configuration in which the immobilizer unit is attached to the upper bracket by fixing the main switch body to the upper bracket with bolts, the immobilizer unit is compactly arranged around the upper bracket via the main switch body. be able to.
[Brief description of the drawings]
FIG. 1 is an overall configuration diagram of an anti-theft system using an immobilizer according to the present invention.
FIG. 2 is a cross-sectional configuration explanatory view of an immobilizer unit according to the present invention.
FIG. 3 is an exploded perspective view of the immobilizer unit according to the present invention.
FIG. 4 is a front view of the immobilizer / main switch assembly according to the present invention.
FIG. 5 is a top view of the assembly of FIG. 4;
FIG. 6 is a side view of the assembly of FIG. 4;
FIG. 7 is a frame configuration diagram of a front portion of a vehicle body of the motorcycle.
FIG. 8 is a front view of the upper bracket according to the present invention.
FIG. 9 is a sectional view of the upper bracket of FIG. 8;
[Explanation of symbols]
10: Main switch body, 11: Main switch, 12: Key slot,
13: antenna coil, 14: case, 14a: cylindrical part, 14b: box-shaped part,
14c: connecting portion, 15: key, 16: transponder, 17: shooting portion,
18: control circuit unit, 19: ID reading circuit, 20: CPU,
21: power supply circuit, 22: ignition circuit, 23: EEPROM, 24: engine,
25: battery, 26: alarm device, 27: tilt sensor, 28: alarm,
29: meter, 30: handle lock,
31: immobilizer / main switch assembly, 32: printed board,
33: immobilizer unit, 34: bolt, 35: terminal member,
35a: Pin terminal, 35b: Pin terminal, 35c: Tip protrusion, 36: Bobbin,
36a: connecting piece, 37: connector, 38: cable, 39: notch,
40: Opening, 41: Main frame, 42: Head pipe,
43: steering shaft, 44: upper bracket,
45: under bracket, 46: front fork, 47: mounting hole,
48: bolt insertion hole, 49: bolt, 50: front fork insertion fixing hole,
51: Steering shaft insertion fixing hole, 52: Boss, 53: Bolt mounting hole,
54: connecting piece, 55: through hole.

Claims (5)

A cylindrical part having an annular antenna coil attached to one end,
It comprises a box-shaped part that protrudes and is connected to the outer peripheral side of the other end of the cylindrical part,
An immobilizer case structure, wherein an immobilizer unit is formed by accommodating a control circuit board in the box-shaped portion, and a bolt mounting hole for coupling with another component is formed in the box-shaped portion. The case structure for an immobilizer according to claim 1, further comprising a connecting portion protruding on both sides of the side surface of the box-shaped portion, wherein the connecting portion is provided with the connecting bolt mounting hole. 3. An assembly assembly comprising an immobilizer unit and a main switch body, wherein the main switch body and the immobilizer unit are connected by a bolt engaged in the coupling bolt mounting hole. The case structure of the immobilizer according to 1. The case structure for an immobilizer according to any one of claims 1 to 3, wherein the immobilizer unit is attached to an upper bracket that connects left and right front forks of a motorcycle. The case structure of the immobilizer according to claim 4, wherein the immobilizer unit is attached to the upper bracket by fixing the main switch body to the upper bracket with bolts.

Images