JP2005289305A - Anti-theft device of construction machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an anti-theft device of a construction machine capable of improving operability at start-up of a motor while having a tag type transponder. <P>SOLUTION: This anti-theft device of the construction machine includes a key cylinder 32 disposed in a right operation box 26R with a right operation lever 27R, a key 33 inserted in the key cylinder 32 to allow an operation input of an engine 22 start-up command, the tag-type transponder 35 engaged with the key 33, an antenna 36 transmitting a command signal to the tag-type transponder 35 and receiving a personal identification number stored in the tag-type transponder 35, and a controller 38 determining whether the personal identification number received by the antenna 36 is consistent with a personal identification number previously set and stored in a ROM, and allowing engine 22 start-up control when the numbers are determined consistent. The key cylinder 32 is tilted so that a key insertion hole 32a is tilted to face upward in the diagonal direction, and the antenna 36 is provided in the lower side of the key cylinder 32 in the diagonal direction. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a construction machine such as a hydraulic excavator, and more particularly to a theft prevention device for a construction machine having a tag type transponder attached to a key.

  Construction machines such as hydraulic excavators are often used outdoors, and when they are not used, it is generally attempted to prevent the theft of construction machines by removing the key from the key cylinder. doing. Therefore, for example, an immobilizer system using a transponder in which a personal identification number (ID) is stored has been proposed. This immobilizer system transmits a command signal to the transponder from the antenna provided on the construction machine, receives the code number from the transponder via the antenna, and compares the received code number with the code number set and stored in the controller. If the passwords do not match, the engine start circuit is not released, and if the passwords match, the engine can be started.

  Here, for example, when an immobilizer system is retrofitted to a hydraulic excavator, if an electronic key with a built-in transponder is used, it is necessary to replace the corresponding key cylinder, which increases the cost. Therefore, a tag type transponder is attached to the conventional key. There is. At this time, an antenna for transmitting / receiving radio waves to / from the tag type transponder needs to be provided inside the resin cover because the radio waves are shielded by metal. However, there is a case where it is unavoidable to provide an antenna inside the iron cover. To cope with such a case, conventionally, for example, a plurality of through holes are provided in the iron cover, and the antenna is closely attached to the inside of the through hole position. And a structure in which a resin seal is attached to the outside of the through hole position is proposed (for example, see Non-Patent Document 1).

  In this prior art, as shown in the described figures and photos, the iron cover has a flat portion and a lower side from the back side of this flat portion (although not clearly described, but due to the orientation of the key cylinder, etc.) It is comprised by the inclined part which inclined. Then, the antenna is attached in close contact with the inside of the through hole provided in the front flat portion of the iron cover, and the key cylinder is attached to the rear inclined portion of the iron cover.

Japan Society for Invention and Innovation Public Technical Bulletin No. 2003-505380

However, there are the following problems in the above-described prior art.
That is, in the above-described prior art, although the antenna is disposed at a position relatively close to the key cylinder, it is still presumed that the antenna is still more than the communicable distance (for example, about 30 mm) of the antenna. For this reason, the operation mode when starting the engine is as follows. First, the operator brings the tag type transponder close to the communicable distance of the antenna, receives the PIN number from the transponder to the antenna, and after collating the PIN number, A key is inserted into the engine, and the engine is started by rotating the inserted key. That is, in addition to the normal key insertion / rotation operation, it is necessary to perform an operation of bringing the tag type transponder closer to the antenna, so that there remains room for improvement in operability at the time of starting the engine.

  An object of the present invention is to provide a construction machine anti-theft device capable of improving the operability at the time of starting a prime mover while having a tag type transponder.

  (1) In order to achieve the above object, the present invention provides a key cylinder disposed on the right side of a driver's seat with an operation lever, and a key inserted into the key cylinder and capable of operating and inputting a start instruction for a prime mover. A tag type transponder attached to the key, an antenna for transmitting a command signal to the tag type transponder and receiving a code number stored in the tag type transponder, and a code number received by the antenna. Determination means for determining whether or not the personal identification number preset and stored in the storage means matches, and a starting circuit that enables start control by the starting means of the prime mover when the determination means determines that the personal identification number matches. In the antitheft device for construction machinery having a control means, the key cylinder is inclined so that the key insertion port is inclined upward, and the antenna is Providing the inclination direction lower side of the serial key cylinder.

  In the present invention, the key cylinder is inclined so that the key insertion side is inclined upward, and an antenna is provided on the lower side in the inclination direction of the key cylinder. As a result, when the operator inserts the key into the key cylinder, the tag-type transponder attached to the key hangs down on the lower side in the key cylinder tilt direction due to its own weight, and the antenna communication provided on the lower side in the key cylinder tilt direction It is possible to approach a possible range (for example, a distance range of about 30 mm). Then, it is possible to transmit a command signal from the antenna to the tag type transponder and receive the code number stored in the tag type transponder by the antenna, and the code number received by the antenna is set and stored in advance in the storage means. Is determined by the determining means. At this time, if it is determined by the determining means that they do not match, the starting control by the starting means of the prime mover cannot be performed, but if it is determined by the determining means that they match, the starting control by the starting means of the prime mover is performed by the starting circuit control means. Is possible. When the operator operates the key as it is and inputs an instruction to start the prime mover, the prime mover is started by the starting means of the prime mover. Therefore, the password of the tag type transponder is easily verified in the key insertion operation that is normally performed, and the operability at the time of starting the engine can be improved.

  (2) In the above (1), an inclined surface formed around the key cylinder and inclined from the key cylinder side to the antenna side is provided.

  Thereby, since the tag type transponder slides on the inclined surface and moves downward, it is possible to assist the tag type transponder to approach the antenna.

  (3) In the above (1) or (2), there is provided display means provided near the antenna and displaying an operating state of the determination means.

  (4) In any one of the above (1) to (3), an instruction switch for instructing transmission of a command signal from the antenna to the tag type transponder is provided.

  (5) In any one of the above (1) to (4), an antenna position display means for displaying the mounting position of the antenna is provided.

  ADVANTAGE OF THE INVENTION According to this invention, the operativity at the time of motor | power_engine start can be improved, providing a tag type transponder.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a side view showing the overall structure of a small hydraulic excavator to which the construction machine antitheft device of the present invention is applied, and FIG. 2 is a perspective view showing the detailed structure of the interior of the hydraulic excavator. . Hereinafter, when the operator is seated in the driver's seat with the excavator shown in FIG. 1, the front side (left side in FIG. 1), rear side (right side in FIG. 1), left side (paper surface in FIG. 1). The front side) and the right side (back side toward the paper surface in FIG. 1) are simply referred to as front side, rear side, left side, and right side.

  1 and 2, this hydraulic excavator includes a lower traveling body 2 having left and right endless track footwear (crawlers) 1L and 1R (only 1L is shown in FIG. 1) as traveling means, The upper swing body 3 that is turnably mounted on the upper part of the traveling body 2 and the swing frame 4 that forms the basic lower structure of the upper swing body 3 can be rotated horizontally around a vertical pin (not shown). A swing post 5 attached to the swing post 5, a multi-joint type front device 6 attached to the swing post 5 so as to be pivotable (can be lifted and lowered), and a so-called canopy type provided on the revolving frame 4. A cab 7, a counterweight 8 attached to the rear part on the swivel frame 4, and an upper cover 9 that covers most of the swivel frame 4 other than the cab 7 are provided.

  The lower traveling body 2 includes a substantially H-shaped track frame 10 and drive wheels 11L and 11R rotatably supported near the rear ends of the left and right sides of the track frame 10 (only 11L is shown in FIG. 1). Left and right traveling hydraulic motors 12L and 12R (only 12L shown in FIG. 1) for driving the drive wheels 11L and 11R, respectively, and rotatably supported in the vicinity of the left and right front ends of the track frame 10, Driven wheels (idlers) 13L and 13R (only 13L is shown in FIG. 1) rotated by the driving force of the drive wheels 11L and 11R via the footwear 1L and 1R, and can be moved up and down in front of the track frame 10. And a blade 14 for earth removal which is moved up and down by a blade hydraulic cylinder (not shown). Further, a swivel bearing (swivel wheel) 15 is disposed in the center of the lower traveling body 2, and a turning hydraulic motor (not shown) for turning the turning frame 4 relative to the lower traveling body 2 in the vicinity of the center of the swirling wheel 15. Z) is built-in.

  The swing post 5 can be horizontally rotated with respect to the revolving frame 4 via a vertical pin (not shown). The swing post 5 is connected to a swing hydraulic cylinder (not shown) provided on the swing frame 4 via a connecting pin (not shown), and the swing post 5 is expanded and contracted by the expansion and contraction of the swing hydraulic cylinder. The front device 6 swings to the left and right by rotating around the vertical axis as a whole.

  The front device 6 includes a boom 16, an arm 17 that is rotatably connected to the boom 16, and a bucket 18 that is rotatably connected to the arm 17. The boom 16, the arm 17, and the bucket 18 are operated by a boom hydraulic cylinder 19, an arm hydraulic cylinder 20, and a bucket hydraulic cylinder 21, respectively.

  The upper cover 9 includes an engine 22 (a prime mover, see FIG. 5 described later), a hydraulic pump (not shown) driven by the engine 22, and a device such as a fuel tank for storing fuel of the engine 22. Is housed. A plurality of hydraulic actuators (specifically, the blade hydraulic cylinder, the swing hydraulic motor, the swing hydraulic cylinder, the boom hydraulic cylinder 19, and the arm hydraulic pressure are generated by pressure oil discharged from the hydraulic pump. Cylinder 20, bucket hydraulic cylinder 21, etc.) are driven.

  The driver's cab 7 is provided on the left side of the revolving frame 4 and includes a seat (driver's seat) 23 on which an operator is seated. In front of the seat 23, left and right traveling operation levers 24L and 24R that can be operated by both hands and feet for driving the left and right traveling hydraulic motors 12L and 12R, respectively, to move the hydraulic excavator forward or backward. Is provided. An optional operation pedal 25L for driving an optional hydraulic actuator (for example, a breaker hydraulic motor) is provided on the left side (lower right side in FIG. 2) of the left travel operation lever 24L. A swing for driving the swing hydraulic cylinder and swinging the swing post 5 (in other words, the entire front device 6) to the left and right is further provided on the right foot (upper left side in FIG. 2) of the right travel operation lever 24R. An operation pedal 25R is provided.

  On the left side of the seat 23, for example, a left operation box 26L made of resin is provided. An upper portion of the left operation box 26L is operated leftward or rightward to drive the turning hydraulic motor, and the upper turning body 3 is turned leftward or rightward and operated forward or rearward to operate the arm hydraulic pressure. A cross operation type left manual operation lever 27L for driving the cylinder 20 to dump or cloud the arm 17 is provided. In addition, on the front side of the left operation box 26L, there is provided a lock lever 28 for preventing an erroneous operation that cuts off the original pressure from a hydraulic source such as a pilot pump.

  A right operation box 26 </ b> R made of, for example, resin is provided on the right side portion of the seat 23. The upper portion of the right operation box 26R includes a flat portion 29a on the front side, a flat portion 29b on the rear side that is one step lower than the flat portion 29a, and an inclined portion that is inclined rearward and downward between the flat portions 29a and 29b ( Inclined surface) 29c. The front flat portion 29a of the right operation box 26R is operated for the boom by operating the left side or the right side to drive the bucket hydraulic cylinder 21 to cloud or dump the bucket 18 and operating the front side or the rear side. A cross operation type right manual operation lever 27 </ b> R is provided to drive the hydraulic cylinder 19 to lower or raise the boom 16. Further, a console 30 having various switches and a monitor is provided in the rear flat portion 29b of the right operation box 26R, and a power ON / OFF and engine 22 start instruction is provided in the inclined portion 29c of the right operation box 26R. A key switch 31 and the like for operating the input are provided.

  FIG. 3 is a partial enlarged view as seen from the direction of arrow III in FIG. 2 showing the detailed structure around the key switch 31, which is the main part of the present embodiment, and shows a state in which no key is inserted in the key cylinder. FIG. 4 is a side sectional view showing an arrangement relationship around the key switch 31 in a state where the key is inserted into the key cylinder.

  3 and 4, the key switch 31 includes a key cylinder 32 having a key insertion slot 32a covered with an opening / closing lid 32b, and a key 33 that can be inserted into the key insertion slot 32a of the key cylinder 32. ing. The key cylinder 32 is suspended from the inclined surface 29c of the right operation box 26R (in other words, the key cylinder 32 is inclined), and the key insertion port 32a is directed rearward and upward obliquely (upper right direction in FIG. 4). ing. A through hole 33a is formed on the grip side of the key 33 (upper right side in FIG. 4), and a tag type transponder 35 is engaged with the through hole 33a via a ring 34 or the like. When the key 33 is inserted into the key insertion port 32a of the key cylinder 32, the tag-type transponder 35 is rearwardly lower than the key cylinder 32 due to its own weight (in other words, the lower side in the tilt direction of the key cylinder 32, right in FIG. 4). (Lower side).

  Although the details of the tag type transponder 35 are not shown, the tag type transponder 35 includes, for example, a known thin plate-like transponder (automatic response machine) and a resin tag covering the periphery of the transponder. A ring 34 is engaged with a through hole provided in the. The transponder stores a personal identification number (ID) set for each hydraulic excavator, and transmits the personal identification number in response to an external command signal.

  The rear side of the key cylinder 32 in the inclined portion 29c of the right operation box 26R is closely attached to the inner side (lower side in FIG. 4) of the antenna 36 for transmitting and receiving radio waves with the transponder 35. An antenna position display label 37 (for example, a circle or the like is printed) indicating the mounting position of the antenna 36 is attached to the outside. When the antenna 36 receives the password from the transponder 35, the antenna 36 outputs the received password to a controller 38 (an immobilizer, see FIG. 5) described later.

  Further, a protrusion 29d is formed in the vicinity of the key cylinder 32 in the inclined portion 29c of the right operation box 26R, and an inclined surface 29dA inclined toward the key cylinder 32 side antenna side is formed in the protrusion 29d. Further, an indicator lamp (LED) 39 is provided on the protrusion 29d.

  FIG. 5 is a circuit diagram showing the overall configuration of the construction machine antitheft device according to the present embodiment.

  In FIG. 5, the key switch 31 for operating and inputting power ON / OFF and engine 22 start instruction, the tag-type transponder 35 attached to the key 33, and transmission / reception of radio waves to / from the tag-type transponder 35. The antenna 36 for performing the above operation, the controller 38, the switch 40 connected to the controller 38 and operable by the operator, and the indicator lamp 39 for displaying the operating state of the controller 38 (details will be described later). The engine 22 including the starter 41 is provided.

  One of the key switches 31 is connected to the battery (power source) 42, the other ON position is connected to various electric devices, and the start position (ST position) is connected to the controller 38. Thus, when the key switch 31 is in the OFF position, the electric system is turned off and the engine 22 is instructed to stop driving. When the key switch 31 is turned on by the rotation operation of the key 33, the electrical system is turned on. When the key switch 31 is turned to the start position (ST position) by the rotation operation of the key 33, the electrical system is turned on. In addition, a start instruction signal for the engine 22 is output to the controller 38.

  When the signal from the switch 40 is input, the controller 38 performs a predetermined arithmetic processing on the signal and transmits a command signal for requesting a personal identification number to the tag type transponder 35 via the antenna 36. The controller 38 receives the personal identification number from the tag type transponder 35 via the antenna 36, performs a predetermined calculation process on this, and the received personal identification number is preset and stored in a ROM or the like (storage means). It is determined whether or not it matches the password. The control procedure of the controller 38 will be described with reference to FIG. FIG. 6 is a flowchart showing the contents of control processing of the controller 38.

  In FIG. 6, first, in step 100, the unlocking flag F = 0 (locked state) is set, and the process proceeds to step 110, where the control signal to the indicator lamp 39 is turned ON and the indicator lamp 39 blinks. As a result, the controller 38 is activated to indicate that it is locked. In step 120, it is determined whether a signal from the switch 40 is input. If there is no signal input from the switch 40, the determination at step 120 is not satisfied, and the routine returns to step 100 and the same procedure as described above is repeated. On the other hand, if there is a signal input from the switch 40, the determination at step 120 is satisfied, and the routine goes to step 130.

  In step 130, a command signal generated by performing predetermined arithmetic processing is transmitted from the antenna 36 to the tag type transponder 35, and the process proceeds to step 140, where the code number from the tag type transponder 35 is received via the antenna 36. In step 150, it is determined whether or not the received personal identification number matches the personal identification number preset and stored in the ROM or the like. If it is determined that the passwords do not match, the determination in step 150 is not satisfied, and the process returns to step 100 and the same procedure is repeated. On the other hand, if it is determined that the passwords match, the determination at step 150 is satisfied and the routine goes to step 160. In step 160, the unlocking flag F is set to 1 (unlocked state), the process proceeds to step 170, the control signal to the indicator lamp 39 is turned off, and the indicator lamp 39 is turned off.

  Then, when the unlocking flag F = 1, the controller 38 receives a start instruction signal for the engine 22 from the key switch 31, performs a predetermined calculation process on the received signal, and sends the generated drive signal to the engine start circuit 43. Thus, the starter 41 is driven. Further, the controller 38 does not output a drive signal to the engine start circuit 43 when the unlocking flag F = 0.

  In the above description, the starter 41 and the engine start circuit 43 constitute a starting unit for the prime mover described in the claims. Further, the controller 38 constitutes determination means for determining whether the password received by the antenna matches the password set and stored in advance in the storage means, and it is determined by the determination means that the password is matched. Sometimes, the starting circuit control means is configured to enable the starting control by the starting means of the prime mover.

  In addition, the inclined surfaces 29c and 29dA of the right operation box 26R are formed around the key cylinder to form an inclined surface that is inclined from the key cylinder side to the antenna side, and the indicator lamp 39 is provided near the antenna and is determined. Display means for displaying the operating state of the means, the switch 40 constitutes an instruction switch for instructing transmission of a command signal from the antenna to the tag type transponder, and the antenna position display label 37 is the antenna position for displaying the mounting position of the antenna. Display means are configured.

  Next, the operation and effect of this embodiment will be described.

  For example, when the operator starts the engine 22, first, when the operator inserts the key 33 into the key insertion port 32 a of the key cylinder 32, the tag type transponder 35 attached to the key 33 is inclined by the weight of the key cylinder 32. It hangs downward and approaches the communicable range (for example, a distance range of about 30 mm) of the antenna 36 provided on the lower side in the tilt direction of the key cylinder 32. When the operator performs an input operation on the switch 40, the determination in step 120 is satisfied through steps 100 and 110 in FIG. 6 described above. In step 130, the controller 38 performs a predetermined calculation process on the input signal from the switch 40. The command signal is transmitted from the antenna 36 to the tag type transponder 35. In step 140, the password stored in the tag type transponder 35 is received by the antenna 36. In step 150, the controller 35 determines whether or not the received personal identification number matches the personal identification number preset and stored in the ROM or the like. At this time, if it is determined that they do not match, the determination in step 150 is not satisfied, the unlock flag F = 0 (locked state) is set in steps 100 and 110, and the indicator light 39 remains flashing. On the other hand, if it is determined that the passwords match, the determination in step 150 is satisfied, the unlock flag F = 1 (unlocked state) is set in steps 160 and 170, and the indicator light 39 is turned off. Then, when the operator rotates the key 33 as it is to set the key switch 31 to the start position, a start instruction signal for the engine 22 is input from the key switch 31 to the controller 38, and the controller 38 performs a predetermined calculation process. The generated drive signal is output to the engine start circuit 43, whereby the starter 41 is driven and the engine 22 is started.

  As described above, in this embodiment, the key cylinder 32 is tilted so that the key insertion slot 32a is inclined upward, and the antenna 36 is provided on the lower side in the tilt direction of the key cylinder 32, so that the key 33 that is normally performed is provided. In the insertion operation, the tag type transponder 35 approaches the communicable range of the antenna 36, and collation of the password is easily performed. Therefore, the operability when starting the engine can be improved.

  Further, by providing the inclined surfaces 29c and 29dA inclined from the key cylinder 32 side to the antenna 36 side around the key cylinder 32, the tag type transponder 35 slides on the inclined surfaces 29c and 29dA and moves downward. The mold transponder 35 can be aided in approaching the antenna 36.

  In addition, by attaching an antenna position display label 37 that indicates the mounting position of the antenna 36, the operator can confirm the positional relationship between the tag-type transponder 35 and the antenna 36, and can securely verify the password. it can.

  In the above-described embodiment, the configuration in which the key cylinder 32 and the antenna 36 are disposed on the inclined portion 29c of the right operation box 26R has been described as an example, but the present invention is not limited thereto. That is, for example, as shown in FIG. 6, the key insertion port 32a is inclined upward and rearward (upper right side in FIG. 7) in the front flat portion 29a of the right operation box 26R (however, on the inclined portion 29c side). The key cylinder 32 may be inclined, and the antenna 36 may be provided on the inclined portion 29c of the right operation box 26R on the rear side of the key cylinder 32. Although not shown, for example, the right operation box may be formed so that the inclined portion faces the inside (seat 23 side) and the key cylinder 32 and the antenna 36 are disposed. In these cases, the same effect as described above can be obtained.

It is a side view showing the whole structure of the small hydraulic excavator which is the application object of the antitheft device of the construction machine of the present invention. It is a perspective view showing the detailed structure in the cab of the hydraulic excavator to which one Embodiment of the antitheft device of the construction machine of this invention is applied. FIG. 3 is a partially enlarged view as seen from the direction of arrow III in FIG. 2, showing a detailed structure around the key cylinder constituting one embodiment of the antitheft device for construction equipment according to the present invention, in which a key is inserted into the key cylinder. There is no state. It is a sectional side view showing the arrangement relation around the key cylinder which constitutes one embodiment of the antitheft device of the construction machine of the present invention, and is in the state where the key was inserted in the key cylinder. It is a circuit diagram showing the whole structure of one Embodiment of the antitheft device of the construction machine of this invention. It is a flowchart showing the control processing content of the controller which comprises one Embodiment of the antitheft device of the construction machine of this invention. It is a sectional side view showing the arrangement | positioning relationship around the key cylinder which comprises the modification of the antitheft device of the construction machine of this invention.

Explanation of symbols

22 Engine (Motor)
23 seats (driver's seat)
26R Right operation box 32 Key cylinder 32a Key insertion port 33 Key 35 Tag type transponder 36 Antenna 37 Antenna position display label (antenna position display means)
38 controller (storage means, determination means, starting circuit control means)
39 Indicator light (display means)
40 switch (indicator switch)

Claims (5)

A key cylinder arranged on the right side of the driver's seat with an operation lever, a key inserted into the key cylinder and capable of operating and inputting a start instruction of a prime mover, a tag type transponder attached to the key, and the tag An antenna for transmitting a command signal to the type transponder and receiving the personal identification number stored in the tag type transponder, and whether the personal identification number received by this antenna matches the personal identification number preset and stored in the storage means In the anti-theft device for construction machinery, comprising a determination means for determining the start number and a start circuit control means for enabling start control by the start means of the prime mover when the determination means determines that the passwords match.
The key cylinder is inclined so that the key insertion opening is inclined upward,
The anti-theft device for a construction machine, wherein the antenna is provided on the lower side in the tilt direction of the key cylinder.   2. The antitheft device for a construction machine according to claim 1, further comprising an inclined surface formed around the key cylinder and inclined from the key cylinder side to the antenna side.   3. The construction machine antitheft device according to claim 1, further comprising a display unit provided near the antenna and displaying an operating state of the determination unit.   4. The construction machine antitheft device according to claim 1, further comprising an instruction switch for instructing transmission of a command signal from the antenna to the tag type transponder. .   5. The construction machine antitheft device according to claim 1, further comprising an antenna position display means for displaying the mounting position of the antenna.

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