Construction machine

Abstract

Provided is a construction machine comprising a portable key, a main body frame, an operation cabin (15), a transmitter (31) disposed inside the operation cabin (15), and a controller. The portable key receives the first signal transmitted from the transmitter (31) and transmits the second signal to the controller. The operation cabin (15) is provided with a pair of operation cabin inner side walls (15b) and an operation cabin outer side wall which are separated by the operation cabin inner space, and an entrance and exit is arranged in the operation cabin outer side wall. The transmitter (31) is attached to an operation cabin inner wall (15b). The operation cabin inner side wall (15b) is a side wall closer to the center line of the main body frame in the width direction than the operation cabin outer side wall.

Description

Technical Field

[0001] The present invention relates to a construction machine provided with a portable key for setting a driving source to a startable operation state. Background Art

[0002] The following technology is disclosed in the Japanese Patent Gazette No. 6333712 (Patent Document 1), whereby the operator of a construction machine can put the drive source into a startable operation state without inserting a key into the keyhole of the construction machine. Specifically, the construction machine described in Patent Document 1 includes a cockpit, a transmitting antenna, a portable key, and a controller. The transmitting antenna is arranged inside the cockpit and can send a first signal. The portable key is carried by the operator, receives the first signal, and sends a second signal as an authentication signal in response to the reception of the first signal. The controller receives the second signal and determines whether the portable key corresponds to the construction machine. When it is determined that the portable key corresponds to the construction machine, the controller sets the drive source of the construction machine to a startable operation state. The startable operation state is a state in which an operation for starting the drive source can be performed. In this state, the operator turns on the main switch of the construction machine inside the cockpit, thereby starting the drive source.

[0003] The range in which the first signal is transmitted by the transmitting antenna is set to reach the portable key carried by the operator in the cockpit. Specifically, the output of the transmitting antenna is set large enough so that the first signal covers the entire area of ​​the interior space of the cockpit.

[0004] In the engineering machine, if the first signal transmitted from the transmitting antenna leaks outside the cockpit, it is possible that even though the person carrying the portable key is outside the cockpit, the transmission and reception of the first signal and the second signal are established between the portable key and the controller, and the engineering machine becomes the startable operation state. That is, there is a concern that the main switch is suddenly turned on when a person who does not carry the portable key is inside the cockpit or in other unexpected circumstances. This will cause safety problems, such as the drive source being started against the operator's will, causing the engineering machine to move unexpectedly. The concern becomes greater when an opening provided in the cockpit, such as a door or window, is open.

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent No. 6333712 Summary of the invention

[0008] An object of the present invention is to provide a construction machine including a cockpit and a portable key, wherein the construction machine can prevent the construction machine from being accidentally moved while the portable key is outside the cockpit.

[0009] Provided is a construction machine, which includes a main frame, a cockpit, a transmitter, a portable key, and a controller. The cockpit is mounted on the main frame and allows an operator to board the cockpit. The transmitter is disposed inside the cockpit and transmits a first signal. The portable key can be carried by the operator, can receive the first signal, and transmits a second signal as an authentication signal in response to the reception of the first signal. The controller determines whether the portable key corresponds to the construction machine based on the second signal, and when it is determined that the portable key corresponds to the construction machine, sets the drive source of the construction machine to a startable operation state. The startable operation state is a state in which an operation for starting the drive source can be performed. The cockpit is arranged at a position offset in the frame width direction relative to the width direction frame center line. The width direction frame center line is the center line of the main frame in the frame width direction, and the frame width direction is the width direction of the main frame. The cockpit includes a pair of cockpit inner side walls and a cockpit outer side wall, and the cockpit inner side walls and the cockpit outer side walls are opposite to each other in the width direction of the frame across the cockpit inner space accommodating the operator. The cockpit inner side wall is located closer to the center line of the width direction frame than the cockpit outer side wall. An entrance and exit are formed on the cockpit outer side wall, and the entrance and exit allow the operator to enter and exit the cockpit inner space through the entrance and exit. The transmitter is installed on the cockpit inner side wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a perspective view of a hydraulic excavator which is a construction machine according to the first embodiment of the present invention.

[0011] Figure 2 It is a perspective view of a cab included in the hydraulic excavator.

[0012] Figure 3 It is a block diagram showing a control system mounted on the hydraulic excavator.

[0013] Figure 4 This is a flowchart showing processing performed by a portable key control unit included in the control system.

[0014] Figure 5 This is a flowchart showing the processing performed by the authentication unit included in the control system.

[0015] Figure 6This is a flowchart showing the processing performed by the startup control unit included in the control system.

[0016] Figure 7 It is a perspective view showing the position of the first signal transmitting antenna included in the control system.

[0017] Figure 8 It will follow Figure 7 The cross section along the line VIII-VIII is shown in a perspective view in which the cross section is enlarged.

[0018] Fig. 9 It is a perspective view showing the position of the first signal transmitting antenna according to the first modification example of the first embodiment.

[0019] Fig.10 It is a perspective view showing the position of the first signal transmitting antenna according to the second modified example of the first embodiment.

[0020] Fig.11 It will follow Fig.10 The cross section along the line XI-XI is shown in a front view in which the cross section is enlarged.

[0021] Fig.12 It is a perspective view showing the position of the first signal transmitting antenna according to the third modified example of the first embodiment.

[0022] Fig.13 It will follow Fig.12 The cross section along the line XIII-XIII is shown in a front view in an enlarged manner.

[0023] Fig.14 It is a perspective view showing the position of a first signal transmitting antenna according to the second embodiment of the present invention.

[0024] Fig.15 It means along Fig.14 An enlarged cross-sectional view of the cross section taken along line XV-XV is shown.

[0025] Fig.16 It is a perspective view showing the position of a first signal transmitting antenna according to the third embodiment of the present invention.

[0026] Fig.17 It is a perspective view showing the position of a first signal transmitting antenna according to the fourth embodiment of the present invention.

[0027] Fig.18 It is a perspective view showing the position of a first signal transmitting antenna according to a fifth embodiment of the present invention.

[0028] Fig.19 It means Figures 1 to 18A perspective view showing the position of a first signal transmitting antenna according to a technique different from the disclosed technique.

[0029] Fig. 20 Yes means Fig.19 A cross-sectional side view showing the position of the first signal transmitting antenna.

[0030] Fig.21 Yes means Fig.19 A front view showing the position of the first signal transmitting antenna.

[0031] Fig. 22 It means Figure 1-2 A perspective view showing the position of a first signal transmitting antenna according to a technique different from the disclosed technique.

[0032] Fig.23 Yes means Fig. 22 A cross-sectional side view showing the position of the first signal transmitting antenna.

[0033] Fig.24 Yes means Fig. 22 A front view showing the position of the first signal transmitting antenna. DETAILED DESCRIPTION

[0034] Hereinafter, embodiments of the present invention will be described in detail based on the drawings. Figure 1 This is a perspective view of the hydraulic excavator 10 according to the first embodiment of the present invention as viewed from the left side. Figure 2 This is a perspective view in which a cab 15 included in the hydraulic excavator 10 is selected and viewed from the right front.

[0035] The hydraulic excavator 10 is a construction machine that mainly performs excavation work, and includes a crawler-type lower traveling body 12 , an upper revolving body 13 installed above the lower traveling body 12 via a revolving mechanism, and a working device 14 installed on the upper revolving body 13 .

[0036] The lower traveling body 12 has a pair of crawlers 12a. The upper rotating body 13 is mounted on the lower traveling body 12 in a manner that it can rotate relative to the lower traveling body 12 around a rotating axis extending in the up-down direction. The upper rotating body 13 includes a rotating frame 11 extending in the horizontal direction, and the rotating frame 11 functions as a main frame involved in the present invention. Although the rotating frame 11 can rotate relative to the lower traveling body 12, the main frame involved in the present invention may not be able to rotate. The rotating frame 11 has a frame front-to-back direction and a frame width direction. The frame front-to-back direction is the front-to-back direction of the rotating frame 11. The frame width direction is the width direction of the rotating frame 11, which is orthogonal to the long side direction of the frame.

[0037] The working device 14 can perform working actions for performing construction work including the excavation work. The working device 14 includes a boom 14a, an arm 14b, a bucket 14c, and a plurality of hydraulic cylinders.

[0038] The boom 14a has a base end and a distal end on the opposite side of the base end, and the base end is connected to the revolving frame 11 via a boom pivot. The boom pivot extends in a direction parallel to the width direction of the frame, and the boom 14a can swing in the upward and downward directions with respect to the revolving frame 11 around the boom pivot. The boom 14a extends upward from the base end, changes direction midway, and further extends forward to the distal end.

[0039] The arm 14b has a base end and a distal end on the opposite side of the base end, and the base end is connected to the distal end of the boom 14a via an arm pivot. The arm pivot extends in a direction parallel to the width direction of the frame, and the arm 14b can swing in the upward and downward directions relative to the boom 14a with the arm pivot as the center. The arm 14b extends straightly further forward or downward from the distal end of the boom 14a.

[0040] The bucket 14c is rotatably connected to the distal end of the arm 14b via a bucket pivot extending in a direction parallel to the frame width direction, and the bucket 14c can swing in the vertical direction relative to the arm 14b around the bucket pivot.

[0041] The plurality of hydraulic cylinders include a boom cylinder 14d, an arm cylinder 14e, and a bucket cylinder 14f. The boom cylinder 14d is configured so that the boom 14a can swing around the boom pivot. The arm cylinder 14e is configured so that the arm 14b can swing around the arm pivot. The bucket cylinder 14f is configured so that the bucket 14c can swing around the bucket pivot.

[0042] The upper revolving body 13 further includes a cockpit 15. The cockpit 15 is mounted above the revolving frame 11 and allows an operator to ride in the cockpit 15. The cockpit 15 is arranged on one side of the revolving frame 11 in the width direction relative to the frame center line in the width direction (the left side of the revolving frame 11, on the left side of the revolving frame 11). Figure 1 The width direction frame center line is the center line of the revolving frame 11 in the width direction of the frame, and extends along the front-rear direction of the frame.

[0043] The cockpit 15 is a closed box-shaped body that defines the cockpit interior space, and the cockpit interior space is a space for accommodating operators. The cockpit 15 includes a plurality of cockpit walls that define the cockpit interior space. The plurality of cockpit walls include a top wall 15a, a right side wall 15b, a left side wall 15c, a front wall 15d, a rear wall 15e, and a bottom wall 15f, and these cockpit walls are located at the upper side, right side, left side, front side, lower side, and rear side of the cockpit interior space, respectively. The rear wall 15e and the bottom wall 15f are shown in FIG. Figure 7 . At least a portion of the multiple cockpit walls includes a wall body formed with an opening, and a cover member that closes the opening. That is, the cockpit 15 involved in the present embodiment includes at least one opening. In the interior space of the cockpit, a plurality of operating devices for operating the hydraulic excavator 10 are arranged, and the plurality of operating devices include an operating seat, a joystick, a main switch, various instruments, a main controller, a transmitting antenna, a receiving antenna, and the like. The operating seat allows an operator to sit on the operating seat. In order to ensure the field of vision of the operator sitting on the operating seat, a window serving as an opening is formed on the wall body of at least a portion of the multiple cockpit walls, and the window is closed by a transparent plate serving as the cover member. The transparent plate is composed of, for example, a glass plate, and constitutes a non-shielding portion. The non-shielding portion allows electromagnetic waves constituting the first signal and the second signal described in detail later to pass through the non-shielding portion.

[0044] The right side wall 15b and the left side wall 15c included in the multiple cockpit walls of the cockpit 15 are equivalent to a pair of cockpit side walls facing each other in the width direction of the frame across the cockpit internal space accommodating the operator. In detail, the left side wall 15c is equivalent to the outer side wall of the cockpit, and the right side wall 15b is equivalent to the inner side wall of the cockpit located closer to the center line of the width direction frame than the left side wall 15c. The inner side wall of the cockpit involved in this embodiment, that is, the right side wall 15b, is located along the center line of the width direction frame, and the working device 14 is adjacent to the outer side of the right side wall 15b (inner side wall of the cockpit) (in this embodiment, the right side of the upper rotating body 13, Figure 1The cockpit outer side wall, i.e., the left side wall 15c, includes a side wall body having an entrance and exit 15g, and an entrance and exit door 16 connected to the side wall body in a manner that the entrance and exit 15g can be opened and closed. The entrance and exit 15g penetrates the side wall body along the width direction of the frame to allow the operator to enter and exit the interior space of the cockpit through the entrance and exit 15g. The entrance and exit door 16 is connected to the side wall body in a manner that allows it to rotate around an axis in the up-down direction along the front end or rear end of the entrance and exit door 16, for example. The upper half of the entrance and exit door 16 involved in this embodiment may also be a transparent plate such as a glass plate, and the transparent plate may also be opened and closed relative to the side wall body.

[0045] exist Figure 2 In the embodiment, the portion of the plurality of cockpit walls constituting the cockpit 15 that is formed by the transparent plate is colored. The transparent plate of the front wall 15d among the plurality of cockpit walls is a windshield 17. In addition, the inner side wall of the cockpit, i.e., the right side wall 15b, includes a side wall body extending along a vertical plane, and the side wall body includes a transparent plate 18 and an outer wall plate 19. The transparent plate 18 constitutes at least the upper half of the side wall body. The outer wall plate 19 constitutes the portion of the side wall body other than the transparent plate 18, i.e., the approximate lower half of the side wall body. The transparent plate 18 is, for example, composed of a glass plate, and constitutes a non-shielding portion that allows light and electromagnetic waves to pass through, respectively. The outer wall plate 19 is composed of a metal plate, and constitutes a shielding portion that prevents light and electromagnetic waves from passing through, respectively. In this way, the transparent plate 18 constituting the non-shielding portion is arranged at a position that deviates from the outer wall plate 19 in the direction along the vertical plane (in the upward direction in this embodiment).

[0046] The hydraulic excavator 10 according to the present embodiment includes Figure 3 The driving source start control system 30 shown is a control system for setting the driving source of the hydraulic excavator 10 to a startable operation state. The driving source start control system 30 includes a plurality of system elements. The plurality of system elements include a first signal transmitting antenna 31, a second signal receiving antenna 32, a main switch 33, a main controller 34, a driving source controller 37, a driving source 38, and a plurality of portable system elements included in a portable key 40, and perform electronic control. The system elements other than the plurality of portable system elements among the plurality of system elements are mechanical system elements installed in the hydraulic excavator 10, and the portable key 40 including the plurality of portable system elements can be taken away from the hydraulic excavator 10 when the hydraulic excavator 10 is not in use. The plurality of mechanical system elements are supplied with driving power by a power source (battery, etc.) not shown in the figure. The plurality of portable system elements are supplied with driving power by a dry cell not shown in the figure placed in the portable key 40.

[0047] The main controller 34 includes an authentication unit 35 and a start control unit 36. The main controller 34 transmits and receives a first signal X1 and a second signal X2 between the controller 34 and the portable key 40 via the first signal transmitting antenna 31 and the second signal receiving antenna 32. The first signal X1 is, for example, a LF (Low Frequency) signal in a frequency band of about 125 kHz, and is transmitted from the first signal transmitting antenna 31 (hereinafter, sometimes simply referred to as a "transmitting antenna") as a transmitter.

[0048] The plurality of portable system elements in the portable key 40 include a first signal receiving antenna 41, a second signal transmitting antenna 42, and a portable key controller 43. The portable key controller 43 includes a portable key control unit 44. If the first signal receiving antenna 41 receives the first signal X1 with a strength that can be perceived, the portable key controller 43 causes the second signal transmitting antenna 42 to transmit the second signal X2. The second signal X2 is, for example, an RF (Radio Frequency) signal in a frequency band of approximately 312 MHz, and is an authentication signal including an authentication ID code set corresponding to the portable key 40.

[0049] The authentication unit 35 of the main controller 34 compares the authentication ID code included in the second signal X2 received from the portable key 40 with the legitimate ID code pre-stored in the authentication unit 35, thereby determining whether the portable key 40 corresponds to the hydraulic excavator 10. If the main switch 33 is operated in a state where it is determined that the portable key 40 corresponds to the hydraulic excavator 10, the start control unit 36 ​​inputs a start command to the drive source controller 37.

[0050] The drive source controller 37 responds to the start command input to the drive source controller 37 and starts the drive source 38. The drive source 38 involved in this embodiment is an internal combustion engine such as an engine, which includes a starter motor, an igniter, and a fuel injection valve. The starter motor is energized to rotate, the igniter ignites, and fuel is injected from the fuel injection valve of the fuel injection device, thereby actually starting the drive source 38.

[0051] The driving source startup control system 30 is configured to execute a plurality of processes at a predetermined period (e.g., 0.1 seconds), including a process performed by the portable key control unit 44 in the portable key controller 43, a process performed by the authentication unit 35 of the main controller 34, and a process performed by the startup control unit 36 ​​of the main controller 34.

[0052] Figure 4 : is a flowchart showing the processing performed by the portable key control unit 44. The portable key control unit 44 determines whether the first signal receiving antenna 41 has received the first signal X1 (step S11 is "yes"), the portable key control unit 44 inputs the working instruction to the second signal transmitting antenna 42, so that the second signal transmitting antenna 42 transmits the second signal X2 (step S12). On the other hand, when it is determined that the first signal X1 is not received (step S11 is "no"), the portable key control unit 44 does not input the working instruction for transmitting the second signal X2 to the second signal transmitting antenna 42.

[0053] Figure 5 The process performed by the authentication unit 35 is shown. The authentication unit 35 determines whether the second signal receiving antenna 32 has received the second signal X2 (step S21). When it is determined that the second signal receiving antenna 32 has not received the second signal X2 (step S21 is "No"), the authentication unit 35 directly ends the process.

[0054] When it is determined that the second signal receiving antenna 32 has received the second signal X2, the authentication unit 35 performs authentication processing of the portable key 40 based on the received second signal X2 (step S22). Specifically, the authentication unit 35 performs a process of comparing the authentication ID code included in the received second signal X2 with a pre-set regular ID code.

[0055] The authentication unit 35 determines whether the portable key 40 is a legitimate portable key through the comparison (step S23). Specifically, when the authentication ID code included in the second signal X2 is consistent with the legitimate ID code, the authentication unit 35 determines that the portable key 40 is a portable key corresponding to the hydraulic excavator 10, that is, a legitimate portable key. When the authentication ID code included in the second signal X2 is inconsistent with the legitimate ID code, the authentication unit 35 determines that the portable key 40 is not a portable key corresponding to the hydraulic excavator 10, that is, it is not a legitimate portable key.

[0056] When it is determined that the portable key 40 is a legitimate portable key ("Yes" in step S23), the authentication unit 35 sets the drive source 38 to a startable operation state (step S24). The startable operation state is a state in which the drive source 38 can be started by operating the main switch 33 when the drive source 38 is stopped.

[0057] If it is determined that the portable key 40 is not legitimate (step S23: No), the authentication unit 35 sets the drive source 38 to an inoperable operation state (step S25). The inoperable operation state is a state in which the drive source 38 remains stopped and cannot be activated even if the main switch 33 is operated.

[0058] Figure 6 2 shows the process performed by the activation control unit 36. The process performed by the activation control unit 36 ​​is executed when the drive source 38 is stopped.

[0059] The start control unit 36 ​​obtains information related to the operation state of the main switch 33, specifically, obtains information related to whether the main switch 33 has been pressed (step S31), and determines the operation state of the main switch 33 based on the information thus obtained (step S32). When it is determined that the main switch 33 has not been pressed (step S32 is "No"), the start control unit 36 ​​directly ends the processing. When it is determined that the main switch 33 has been pressed (step S32 is "Yes"), the start control unit 36 ​​determines whether the drive source 38 has been set to the startable operation state in the above-mentioned step S24 (step S33).

[0060] In the case where the driving source 38 has been set to the startable operation state (step S33 is "Yes"), since the main switch 33 is operated (step S32 is "Yes"), and the portable key 40 corresponds to the hydraulic excavator 10 ( Figure 5The answer to step S23 shown in the figure is "Yes", so the start control unit 36 ​​inputs the start command of the drive source 38 to the drive source controller 37. The drive source controller 37, which has received the input of the start command, inputs the work command to the starter and the fuel injection valve of the drive source 38, so as to start the drive source 38 (step S34). The drive source 38 thus started drives a hydraulic pump not shown, which supplies hydraulic pressure to multiple hydraulic actuators in the hydraulic excavator 10. The multiple hydraulic actuators include a travel actuator for moving the pair of crawlers 12a, a rotation actuator for rotating the upper rotating body 13, the boom cylinder 14d, the arm cylinder 14e, the bucket cylinder 14f, and a travel actuator for rotating the upper rotating body 13. Figure 1 The scraper 14g is shown as an actuator.

[0061] In the case where the driving source 38 has been set to the inoperable operation state (step S33: No), since the portable key 40 does not correspond to the hydraulic excavator 10 ( Figure 5 Therefore, even though the main switch 33 has been operated ("Yes" in step S32), the activation control unit 36 ​​does not activate the driving source 38 (step S35).

[0062] Next, the position where the transmitting antenna (the first signal transmitting antenna 31 ) is installed in the hydraulic excavator 10 will be described in detail.

[0063] Figure 7 This is a perspective view of the control room inside the cockpit 15 according to the present embodiment as viewed from the left front. Figure 8 The following is a stereoscopic view of the cut surface observed from the left front, the cut surface is taken along the plane VIII-VIII. Figure 7 The cross section is formed by cutting off the right side wall 15b of the cockpit 15 shown in FIG. Figure 7 and Figure 8 In the figure, some parts are omitted from illustration.

[0064] The outer wall plate 19 constituting the approximate lower half of the right side wall 15b is made of a steel plate or other metal plate, and prevents electromagnetic waves in the khz band or the MHz band from penetrating the outer wall plate 19. Therefore, the outer wall plate 19 blocks the first signal X1 and the second signal X2 respectively. The outer wall plate 19 has an outer wall surface facing the outside of the right side wall 15b, and an inner wall surface facing the inside of the cockpit 15, and the inner wall surface is covered by an inner wall plate 49 made of resin. The inner wall plate 49 is a decorative panel facing the interior space of the cockpit, and is a non-shielding member that allows electromagnetic waves to pass through. The inner wall surface, i.e., the surface side surface, of the inner wall plate 49 defines the inner end of the interior space of the cockpit. A wiring space with a narrow width is defined between the inner wall surface of the outer wall plate 19 and the inner side surface, i.e., the outer wall surface, of the inner wall plate 49.

[0065] In the first embodiment, various wirings related to the electrical components and the first signal transmitting antenna 31 as a transmitter are arranged in the wiring space. Figure 8 In the illustrated example, the first signal transmitting antenna 31 is disposed in a central region of the outer wall plate 19 away from the upper edge, the lower edge, the front edge, and the rear edge of the outer wall plate 19 .

[0066] The inner wall plate 49 is made of resin and allows electromagnetic waves in the khz band or the MHz band to pass through the inner wall plate 49. Therefore, when the portable key 40 is located in the inner space of the cockpit, the first signal receiving antenna 41 of the portable key 40 can reliably receive the first signal X1 transmitted from the first signal transmitting antenna 31. In contrast, when the portable key 40 is outside the cockpit 15 and outside the outer wall plate 19 (at the outer wall of the cockpit), the first signal receiving antenna 41 of the portable key 40 can reliably receive the first signal X1 transmitted from the first signal transmitting antenna 31. Figure 1 and Figure 8 In the case of (the left side in the figure), the outer wall plate 19 that shields the first signal X1 will prevent the first signal X1 from reaching the portable key 40 with sufficient strength, that is, prevent it from being received by the first signal receiving antenna 41.

[0067] Thus, the outer wall plate 19 constitutes an outer shielding portion located outside the first signal transmitting antenna 31 disposed in the cockpit 15, preventing the first signal transmitting antenna 31 from penetrating through the outer wall plate 19 and leaking into the outer space of the outer wall plate 19 (at the outer wall plate 19). Figure 1 and Figure 7The space on the left side is in the right side wall 15b including the outer wall panel 19. The right side wall 15b is located on the revolving frame 11 as the main frame and is closer to the center line of the width direction frame than the left side wall 15c as the outer side wall of the cockpit. It is not easy for an operator to approach the right side wall 15b from the outside. Therefore, even if the operator carries the portable key 40, the first signal X1 output from the first signal transmitting antenna 31 is effectively suppressed from reaching the portable key 40. Moreover, in this embodiment, because the operating device 14 is adjacent to the outer side of the right side wall 15b, it is more effective to prevent the operator from the outside (on the Figure 1 The left side in the middle is close to the right side wall 15b.

[0068] On the other hand, the operator is more likely to approach the left side wall 15c, which is the outer side wall of the cockpit, than the right side wall 15b. Furthermore, when the entrance 15g formed on the right side wall 15b is opened, the first signal X1 is allowed to leak to the outer space of the left side wall 15c through the entrance 15g (at Figure 1 However, between the first signal transmitting antenna 31 and the entrance and exit 15g, there is a distance in the width direction of the frame equivalent to the width of the space inside the cockpit. Therefore, the leakage of the first signal X1 through the entrance and exit 15g can still be effectively suppressed.

[0069] Fig. 9 express Figure 8 The position of the first signal transmitting antenna 31 involved in the first variant of the first embodiment is shown. The cockpit 15 involved in the first variant also includes a right side wall 15b as the inner wall of the cockpit, similarly to the cockpit 15 involved in the first embodiment, and the right side wall 15b includes an inclined beam 51 in addition to the outer wall panel 19 facing the outside of the cockpit and the inner wall panel 49 facing the internal space of the cockpit. The inclined beam 51 is arranged in the gap formed between the outer wall panel 19 and the inner wall panel 49, and extends obliquely from the front lower part of the outer wall panel 19 to the rear upper part. The inclined beam 51 is made of steel extending along a specific long side direction, for example, a channel-shaped member, and is arranged along the outer wall panel 19 to increase the rigidity of the cockpit 15, thereby functioning as a reinforcing member. Fig. 9 In order to make the inclined beam 51 visible, the lower part of the inner wall plate 49 is cut away.

[0070] The inclined beam 51 includes an upper wall portion 51b, a lower wall portion 51d, and an intermediate wall portion 51c. The upper wall portion 51b and the lower wall portion 51d are opposed to each other in the up-down direction and extend along the long side direction. The intermediate wall portion 51c extends along the long side direction and is respectively combined with the relevant edges in a manner that the edges of the upper wall portion 51b and the lower wall portion 51d on the same side are connected to each other. Therefore, the inclined beam 51 involved in the first variant has a shape that opens toward the outer wall plate 19, that is, a shape that opens to the outside of the cockpit 15, and has a substantially reverse C-shaped cross-section when viewed from the front side. The edges of the open sides of the upper wall portion 51b and the lower wall portion 51d are in contact with the inner wall surface of the outer wall plate 19. That is, the opening formed between the upper wall portion 51b and the lower wall portion 51d is closed by the outer wall plate 19.

[0071] The inclined beam 51 is a shielding member made of a conductive material and preventing electromagnetic waves from passing through the inclined beam 51. The first signal transmitting antenna 31 is arranged on the inner side of the inclined beam 51, for example, along the lower wall portion 51d. In this way, the inclined beam 51 covers the first signal transmitting antenna 31 on its upper side and front side, shielding the first signal X1 output from the first signal transmitting antenna 31. In other words, the inclined beam 51 includes a portion constituting an inner shielding portion between the first signal transmitting antenna 31 and the transparent plate 18, and the portion prevents the first signal X1 from passing through. Therefore, the first signal X1 transmitted from the first signal transmitting antenna 31 cannot reach the transparent plate (in the inclined beam 51) unless it makes a complex detour in the inclined beam 51. Fig. 9 The transparent plate 18 is located on the upper side of the inclined beam 51). This will prevent the first signal X1 output from the first signal transmitting antenna 31 from passing through the transparent plate 18 as the non-shielding portion and leaking to the outside of the cockpit 15. In this way, the inclined beam 51 as the reinforcing member also functions as an inner shielding portion, which prevents the first signal X1 from passing through the inclined beam 51 from the first signal transmitting antenna 31 and reaching the transparent plate 18 as the non-shielding portion. Therefore, according to Fig. 9 The first modification shown can prevent the drive source 38 from being set to the startable operation state or actually starting even if the portable key 40 is outside the transparent plate 18 as the non-shielding portion, thereby further improving the safety performance of the hydraulic excavator 10.

[0072] Fig.10 is a perspective view showing a second modified example of the first embodiment, Fig.11 The following section is enlarged and shown. The section is taken along Fig.10The vertical plane of the XI-XI line shown is a cross section formed by cutting the right side wall 15b which is the inner wall of the cockpit. Fig. 9 A further variation of the first variation shown.

[0073] The right side wall 15b involved in the second variant includes an inner shielding portion, which includes a mounting member 52 in addition to the inclined beam 51. The mounting member 52 is a member for mounting electrical components on the outer wall panel 19, and is fixed at a position below the inclined beam 51. The mounting member includes a vertical plate 52b and a horizontal plate 52c. The vertical plate 52b extends along a vertical plane and is fixed to the inner wall surface of the outer wall panel 19 in a state of contact with the inner wall surface. The horizontal plate 52c extends from the upper end of the vertical plate 52b to the inner side of the cockpit 15 (at Fig.11 The horizontal plate 52c protrudes to allow the electrical components to be mounted on the horizontal plate 52c.

[0074] The electrical component involved in the second variant is a relay box 53. The relay box 53 is attached to the electrical system of the hydraulic excavator 10 and controls the current supplied to the plurality of electrical components in the control room defined by the cab 15. That is, the relay box 53 is interposed between the plurality of electrical components and the power supply. The relay box 53 is arranged between the control seat (not shown) and the control room 15. Fig.10 The control seat (not shown) is arranged at the center of the cockpit 15 between the outer wall panels 19. The electrical component mounted by the mounting member 52 may be a fuse box or a fuse and relay box.

[0075] The mounting member 52 is made of a metal plate such as a steel plate, and has a function of shielding the first signal X1. On the other hand, the first signal transmitting antenna 31 as a transmitter involved in the second variant is fixed to the lower surface of the horizontal plate 52c of the mounting member 52. Therefore, the vertical plate 52b of the mounting member 52 and the outer wall plate 19 together constitute an outer shielding portion, and the horizontal plate 52c of the mounting member 52 functions as an upper shielding wall (internal shielding portion) covering the first signal transmitting antenna 31 on the upper side of the first signal transmitting antenna 31. That is, the horizontal plate 52c prevents the first signal X1 transmitted from the first signal transmitting antenna 31 from passing through the horizontal plate 52c and reaching the non-shielding portion on the upper side of the horizontal plate 52c, namely, the transparent plate 18, thereby preventing the first signal X1 from passing through the transparent plate 18 and leaking to the outside of the cockpit 15. Therefore, according to Fig.10The second modification shown can more reliably prevent the portable key 40 from being outside the cab 15 while the drive source 38 is set to the activatable operation state or the drive source 38 is actually started, thereby further improving the safety performance of the hydraulic excavator 10.

[0076] As a modified example (not shown) different from the second modified example, it is also possible to store Figure 3 The ECU (engine control unit) storage box of the driving source controller 37 shown is fixed to the inner wall surface of the outer wall plate 19, and the first signal transmitting antenna 31 is not accommodated in the ECU storage box. In this modified example, the top wall and the front wall of the ECU storage box can function as an upper shielding wall and a front shielding wall for shielding the first signal X1 on the upper side and the front side of the first signal transmitting antenna 31.

[0077] Fig.12 is a perspective view showing a third modified example of the first embodiment. Fig.13 The following cross-sectional view is enlarged and shown. The cross-sectional view is taken along Fig.12 The vertical plane along the line XIII-XIII shown is a cross section obtained by cutting the right side wall 15b serving as the inner wall of the cockpit.

[0078] In the third modification, the electrical component box 54 is fixed to the horizontal plate 52c of the mounting member 52 instead of the relay box 53 of the second modification. Fig.13 As shown, the electrical component box 54 includes an upper cover 54d, a lower cover 54f and a partition plate 54g. The upper cover 54d and the lower cover 54f are arranged up and down and engage with each other, thereby defining a storage space. The partition plate 54g is arranged in a manner of crossing the storage space in a horizontal direction, and the storage space is divided into an upper space and a lower space. The upper space is defined by the upper cover 54d and the partition plate 54g, and the lower space is defined by the lower cover 54f and the partition plate 54g. The lower cover 54f has a bottom surface facing downward, and the bottom surface is fixed to the upper surface of the horizontal plate 52c of the mounting member 52.

[0079] An electronic substrate 55b is placed on the upper surface of the partition plate 54g. A plurality of circuit elements 55 are arranged on the upper surface of the electronic substrate 55b, and each of the plurality of circuit elements 55 is, for example, a fuse element or a relay element. The plurality of circuit elements 55 are electrically connected to each other via the electronic substrate 55b. The plurality of circuit elements 55 are stored in the upper space defined by the upper cover 54d and the partition plate 54g. That is, the upper cover 54d is a storage portion for the plurality of circuit elements 55. The electrical component box 54 is a frame having a larger size than the relay box 53.

[0080] In the third modification, the first signal transmitting antenna 31 as a transmitter is fixed to the lower surface of the partition plate 54g. Therefore, the first signal transmitting antenna 31 is covered by the lower cover 54f directly below the partition plate 54g.

[0081] The upper cover 54d and the lower cover 54f are made of resin, and the partition plate 54g includes a metal plate, for example, the metal plate is coated with an insulating coating film. Therefore, the partition plate 54g has electromagnetic wave shielding properties, and functions as an upper shielding wall covering the first signal transmitting antenna 31 on the upper side of the first signal transmitting antenna 31. That is, the partition plate 54g prevents the first signal X1 transmitted from the first signal transmitting antenna 31 from passing through the partition plate 54g and reaching the non-shielding portion above it, namely, the transparent plate 18, thereby preventing the first signal X1 from passing through the transparent plate 18 and leaking to the outside of the cockpit 15. Therefore, in Fig.12 and Fig.13 In the third modified example shown, it is also possible to prevent the portable key 40 from being set to the startable operation state or the drive source 38 from actually starting when the portable key 40 is outside the cockpit 15, thereby improving safety performance. Fig.12 and Fig.13 In the third modification shown, the plurality of circuit elements 55 and the first signal transmitting antenna 31 can be collectively housed in a common electrical component box 54 as a plurality of electrical components.

[0082] Next, a second embodiment of the present invention will be described. Fig.14 is a perspective view showing the interior of the cockpit 15 according to the second embodiment. Fig.15 The following section is enlarged and shown. The section is taken along Fig.14 The vertical plane along the line XV-XV shown is a cross section obtained by cutting the right side wall 15b serving as the inner wall of the cockpit.

[0083] The right side wall 15b of the cockpit 15 according to the second embodiment further includes Fig.14The beam 56 and the console 57 are shown. The beam 56 and the console 57 are located on the right side of the operating seat 50, that is, on the same side as the right side wall 15b, and are arranged along the inner wall surface of the right side wall 15b.

[0084] The beam 56 is a reinforcing member included in the right side wall 15b as the inner side wall of the cockpit, and is arranged so as to increase the rigidity of the right side wall 15b. Fig.14 In the posture shown, the beam 56 is made of a metal material such as steel extending in the front-rear direction, and has a cross section in the shape of an opening toward the outer wall plate (the outer wall plate 19 in the first modification) constituting the outer shielding portion of the right side wall 15b, similarly to the inclined beam 51 involved in the first modification, for example, a cross section having a substantially reverse C-shaped shape. The beam 56 is fixed to the inner wall surface of the outer wall plate in a state where the end surface on the opening side contacts the inner wall surface of the outer wall plate. Therefore, the outer wall plate covers the opening of the beam 56.

[0085] The bracket 57 includes Fig.15 The joystick 58 and the rod support box 59 shown in the figure. The rod support box 59 is box-shaped and is arranged along the inner wall surface of the outer wall plate of the right side wall 15b. The joystick 58 is connected to the upper end of the rod support box 59 and supported by the rod support box 59. The root of the joystick 58 is covered by a cover body 67 fixed to the upper end of the rod support box 59. The rod support box 59 includes a plurality of box walls, and the plurality of box walls include a top wall 59a, an outer side wall 59b, an inner side wall 59c, a front wall 59d and a rear wall 59e. The outer side wall 59b is a side wall facing outward, that is, a side wall close to the right side wall 15b, and the inner side wall 59c is a side wall facing the inner space of the cockpit of the cockpit 15, that is, a side wall located on the opposite side of the right side wall 15b across the outer side wall 59b.

[0086] In the second embodiment, a first signal transmitting antenna 31 as a transmitter is provided inside the rod support box 59. Specifically, the first signal transmitting antenna 31 is located below the root of the joystick 58 and is fixed to the side wall of the outer wall plate close to the right side wall 15b among the multiple box walls of the rod support box 59, and in the second embodiment, is fixed to the inner wall surface of the outer side wall 59b.

[0087] The multiple box walls of the rod support box 59 are each made of a material that does not allow electromagnetic waves to pass through, for example, a metal plate. Therefore, the multiple box walls, namely the top wall 59a, the outer wall 59b, the inner wall 59c, the front wall 59d and the rear wall 59e, constitute shielding walls respectively arranged on the upper side, the outer side, the inner side, the front side and the rear side of the first signal transmitting antenna 31, and suppress the first signal X1 emitted from the first signal transmitting antenna 31 from leaking to the outside of the rod support box 59.

[0088] An opening 59h for maintenance is provided on the inner wall 59c, which is a side wall of the plurality of box walls and is away from the outer wall plate of the right side wall 15b. The opening 59h penetrates the inner wall 59c along the left-right direction of the cockpit 15, i.e., the frame width direction. Fig.15 As shown, the first signal transmitting antenna 31 is formed so as to be able to be positioned from the inner side of the inner wall 59c (at Fig.15 The position of the first signal transmitting antenna 31 is the position where the first signal transmitting antenna 31 is viewed through the opening 59h along the width direction of the frame. For the convenience of maintenance, it is desirable that the opening 59h is larger than the first signal transmitting antenna 31. Under normal circumstances where the maintenance is not performed, the opening 59h is closed by a resin cover plate not shown.

[0089] According to the second embodiment, the first signal X1 transmitted from the first signal transmitting antenna 31 can reach the control seat 50 inside the cockpit 15 through the opening 59h, but cannot pass through the plurality of box walls each serving as a shielding member, thereby preventing the first signal X1 from leaking to the outside of the cockpit 15 through the non-shielding portion of the right side wall 15b located on the upper side of the rod support box 59, namely, the transparent plate 18. Thus, it is possible to prevent the portable key 40 from being set to the startable operation state or the drive source 38 from actually starting.

[0090] The device for operation supported by the support member that also serves as the inner shielding portion, such as the rod support box 59, is not limited to the control rod 58. The device for operation may be, for example, a switch, a button, or a touch screen for operation. In addition, the device for operation and the support member may be connected as one body or may be configured as separate members. The support member may not be in a box shape like the rod support box 59.

[0091] Next, a third embodiment of the present invention will be described. Fig.16 It is a perspective view showing the interior of the cockpit 15 according to the third embodiment, and mainly shows the right side wall 15 b as the cockpit inner wall of the cockpit 15 and the control seat 50 .

[0092] The right side wall 15b of the cockpit 15 according to the third embodiment includes the same beam 56 as the beam 56 according to the second embodiment, and the upper end of a shielding member 60 constituting an inner shielding portion is connected to a lower wall portion 56d of the beam 56. The shielding member 60 is made of steel or other metal material having a cross section (for example, a substantially reverse C-shaped cross section) that opens toward an outer wall plate that is an outer shielding portion of the right side wall 15b, and is arranged to extend downward from the beam 56. The opening of the shielding member 60 is covered by the outer wall plate.

[0093] The beam 56 constitutes an upper shielding wall located on the upper side of the first signal transmitting antenna 31 as a transmitter, and the shielding member 60 constitutes a front shielding wall located in front of the first signal transmitting antenna 31. Specifically, the first signal transmitting antenna 31 is arranged directly below the beam 56 and at a position behind the shielding member 60. The first signal transmitting antenna 31 can be mounted on the lower wall portion 56d of the beam 56 or can be separated from the lower wall portion 56d. Similarly, the first signal transmitting antenna 31 can be mounted on the shielding member 60 or can be separated from the shielding member 60.

[0094] According to the third embodiment, the first signal X1 transmitted from the first signal transmitting antenna 31 cannot pass through any of the beam 56 located above the first signal transmitting antenna 31, the shielding member 60 located in front of the first signal transmitting antenna 31, and the outer wall plate located outside the first signal transmitting antenna 31, thereby preventing the first signal X1 from leaking to the outside of the cockpit 15 through the non-shielding portion located above the beam 56, that is, the transparent plate 18. That is, the beam 56 includes a portion constituting an inner shielding portion between the first signal transmitting antenna 31 and the transparent plate 18, and the portion prevents the first signal X1 from reaching the transparent plate 18 from the first signal transmitting antenna 31. Thus, it is possible to prevent the portable key 40 from being set to the startable operation state or the drive source 38 from actually starting when the portable key 40 is outside the cockpit 15. In particular, by arranging the first signal transmitting antenna 31 at a corner formed by the lower wall portion 56d of the beam 56 and the upper end of the shield 60, it is possible to more effectively suppress the first signal X1 transmitted from the first signal transmitting antenna 31 from spreading upward and forward.

[0095] Next, a fourth embodiment and a fifth embodiment of the present invention will be described. Fig.17 2 is a perspective view showing a frame of a cockpit 15 according to a fourth embodiment. Fig.18 It is a perspective view showing a frame of a cockpit 15 according to the fifth embodiment. Fig.17 and Fig.18Each of the columns and beams constituting the cockpit 15 includes a left front column 61, a right front column 62, a left rear column 63, a right rear column 64, and an intermediate column 65. Each of the columns is made of a steel material such as a square tube, a channel-shaped member, or an angle member, and is respectively arranged at the front, rear, left, and right sides of the cockpit 15 to support the roof of the cockpit 15. The left front column 61 and the left rear column 63 respectively constitute the front and rear edges of the outer side wall of the cockpit 15 (the left side wall 15c involved in the first embodiment), and the right front column 62 and the right rear column 64 respectively constitute the front and rear edges of the inner side wall of the cockpit 15 (the right side wall 15b involved in the first embodiment). The intermediate column 65 is located between the left front column 61 and the left rear column 63 in the outer side wall of the cockpit 15, and defines the rear edge of the entrance 15g. Each of the beams is coupled to the upper end or lower end of the corresponding column among the columns. An opening and closing door (not shown) for opening and closing the entrance 15g is arranged between the left front pillar 61 and the middle pillar 65 .

[0096] exist Fig.17 In the fourth embodiment shown, at least the right rear pillar 64 among the plurality of pillars is formed of a pipe member such as a square pipe, and a communication hole 64h is formed at an appropriate position other than the upper end and the lower end of the right rear pillar 64. The communication hole 64h is formed so that the internal space of the pipe member constituting the right rear pillar 64 communicates with the inside of the cockpit 15 rather than the outside. Preferably, the communication hole 64h is a long hole extending in the up-down direction.

[0097] In the fourth embodiment, a first signal transmitting antenna 31 as a transmitter is arranged in the internal space of the right rear pillar 64. The first signal transmitting antenna 31 is arranged at a height position that allows the first signal X1 transmitted from the first signal transmitting antenna 31 to reach the cockpit internal space of the cockpit 15 through the connecting hole 64h, and is preferably arranged at a height position equal to the height position of the connecting hole 64h.

[0098] exist Fig.18In the fifth embodiment shown, at least the right front pillar 62 among the plurality of pillars is formed of a pipe member such as a square pipe, and a connecting hole 62h is formed at an appropriate position of the right front pillar 62 except for the upper end and the lower end. The connecting hole 62h is also formed in such a way that the internal space of the pipe member constituting the right front pillar 62 is connected to the inside of the cockpit 15 rather than the outside. It is more desirable that the connecting hole 62h is also a long hole extending in the up-down direction. In the fifth embodiment, the first signal transmitting antenna 31 as a transmitter is arranged in the internal space of the right front pillar 62. The first signal transmitting antenna 31 is arranged at a height position that allows the first signal X1 transmitted from the first signal transmitting antenna 31 to reach the cockpit internal space of the cockpit 15 through the connecting hole 62h, and is preferably arranged at a height position equal to the height position of the connecting hole 62h.

[0099] according to Fig.17 and Fig.18 In the fourth embodiment and the fifth embodiment respectively shown, the pillar components of the cockpit 15, namely the right rear pillar 64 and the right front pillar 62, are each a shielding member that does not allow electromagnetic waves to pass through, and constitute an outer shielding portion between the first signal transmitting antenna 31 and the space outside the inner wall of the cockpit. Therefore, the right rear pillar 64 and the right front pillar 62 each suppress the first signal X1 transmitted from the first signal transmitting antenna 31 from leaking outside the cockpit 15. Thus, it is possible to prevent the portable key 40 from being outside the cockpit 15 but the drive source 38 being set to a startable operation state or the drive source 38 from actually starting. On the other hand, the first signal X1 is allowed to pass through the connecting holes 64h, 62h to reach the cockpit internal space of the cockpit 15.

[0100] In each of the first to fifth embodiments and their variations described above, the strength of the first signal X1 transmitted from the first signal transmitting antenna 31 as a transmitter can be set arbitrarily. However, it is more desirable that the strength of the first signal X1 is set to a strength such that the first signal X1 reaches the control seat 50 in the cockpit 15 but does not reach the outside of the cockpit 15 through the entrance 15g. This allows the first signal X1 output from the first signal transmitting antenna 31 to reach the portable key 40 carried by the operator sitting in the control seat 50, and effectively utilizes the width dimension of the cockpit internal space, preventing the first signal X1 from leaking to the outside of the cockpit 15 through the entrance 15g.

[0101] Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the illustrated embodiments. Various modifications or variations may be added to the illustrated embodiments within the same scope as the present invention or within the scope equal to the present invention. For example, a part of the structure may be selected from one of the above-mentioned embodiments, another part of the structure may be selected from the above-mentioned other embodiments, and these selected structures may be combined. In addition to the above-mentioned hydraulic excavator, the present invention may also be applied to cranes or other construction machinery.

[0102] For example, in the cockpit 15 in each of the first to fifth embodiments, the right side wall 15b functions as the cockpit inner wall and the left side wall 15c functions as the cockpit outer wall, but conversely, the left side wall 15c may function as the cockpit inner wall and the right side wall 15b may function as the cockpit outer wall. That is, the cockpit 15 may be arranged at a position biased to the right rather than the left relative to the center line of the width direction frame.

[0103] In addition, the non-shielding portion included in the cockpit inner wall or the inner shielding portion provided in association with the shielded portion is not an essential part. For example, the cockpit inner wall may not include the non-shielding portion.

[0104] Furthermore, for example, Figure 19 to Figure 21 The technology shown or Figure 22 to Figure 24 The technology shown achieves prevention of leakage of the first signal X1 to the outside of the cockpit 15 .

[0105] Fig.19 1 is a perspective view showing the interior of the cockpit 15, and shows a state where the control seat area C inside the cockpit 15 is viewed from the left front of the cockpit 15. Fig.19 In the figure, the front wall, the control seat and the joystick of the cockpit 15 are omitted. Fig. 20 and Fig.21 The diagrams are a sectional side view and a front view showing the control seat area C, respectively.

[0106] In the cockpit 15, in addition to the operating seat 50 arranged on the bottom wall 15f of the cockpit 15, a rear tray 71 and a box 72 are also provided at the rear of the operating seat 50. The rear tray 71 is arranged further forward than the rear wall 15e of the cockpit 15. The rear tray 71 has a plurality of side walls respectively arranged at the front, rear, left and right sides, and a bottom wall connected to the lower edges of the plurality of side walls, and defines a rectangular recessed space open upward. The rear tray 71 can store small items not shown in the figure, and the operator can take and place small items relative to the rear tray 71 from above.

[0107] The box 72 is formed of resin, is arranged just below the rear tray 71, and defines a seat rear space P1. The operator seat 50 includes a seat surface 50b for allowing an operator to sit, a backrest 50c located behind the operator sitting on the seat surface 50b, and an under-seat storage portion 27 located below the seat surface 50b. The rear tray 71 and the box 72 are arranged adjacent to the backrest 50c in the front-rear direction.

[0108] In this technology, various wirings related to electrical components and a first signal transmitting antenna 31 as a transmitter are arranged in the seat rear space P1. The first signal transmitting antenna 31 transmits a first signal X1, and the output strength of the first signal X1 is set so that the first signal X1 can pass through the resin box 72 to reach the control seat 50 and the periphery of the control seat 50, but will not reach the outside of the left side wall 15c which is the outer side wall of the cockpit 15. Specifically, in this technology, as Fig.19 As shown, the reachable range of the first signal X1 output from the first signal transmitting antenna 31 is limited to a spherical space centered on the first signal transmitting antenna 31, namely, an effective range T. That is, the effective range T corresponds to the transmittable range of the first signal X1. The diameter of the effective range T is equal to or smaller than the interval between the outer wall panel 19 of the right side wall 15b serving as the inner wall of the cockpit 15 and the outer wall panel 24 of the left side wall 15c serving as the outer wall of the cockpit. In addition, the upper end of the effective range T is lower than the top wall 15a of the cockpit 15. The control seat 50 is located within the effective range T, preferably near the center of the effective range T.

[0109] The effective range T includes the control seat 50 and at least one control seat peripheral member adjacent to the control seat 25. Figure 20 to Figure 22 In the example shown, the at least one control seat peripheral member includes the rear tray 71 and the box 72. The rear wall 15e is made of a steel plate or other metal plate, and shields the first signal X1, preventing the first signal X1 from leaking to the rear of the rear wall 15e. Figure 3 When a portable key like the portable key 40 shown is located within the effective range T, the first signal transmitting antenna 31 and the portable key 40 can transmit and receive the first signal X1 and the second signal X2.

[0110] according to Figure 19 to Figure 21 The disclosed technology allows the operator who carries a valid portable key to operate the controller (for example, Figure 3The main controller 34 shown in the figure transmits and receives the first signal X1 and the second signal X2 with the portable key. Therefore, a person carrying the legitimate portable key can operate the hydraulic excavator without any problem.

[0111] In contrast, when the portable key is outside the operating seat area C, for example, outside the cockpit 15, the first signal X1 will not reach the portable key, and thus, the first signal X1 and the second signal X2 cannot be sent and received between the controller (for example, the main controller 34) and the portable key, and the drive source 38 will not be set to a startable operation state. In this way, it is possible to prevent the drive source 38 from being set to a startable operation state or the drive source 38 from actually starting when the portable key is outside the operating seat area C. This effect can be achieved even if the first signal transmitting antenna 31 is arranged on the rear tray 71. In addition, the operating seat area C is not limited to an area defined by a plate member such as the box 72.

[0112] Fig. 22 It is a perspective view showing another technique, and mainly shows elements in the control seat area C. Fig.23 and Fig.24 They are a sectional side view and a front view of the control seat area C, respectively.

[0113] The technology disclosed herein is useful for types and Figure 19 to Figure 21 The open canopy 75 different from the cockpit 15 shown in the figure applies the technology related to the portable key. The control seat area C is located inside the open canopy 75, and the control seat 50 is arranged in the control seat area C. In the open canopy 75, the Figure 2 At least one of the top wall 15a, the front wall 15b, the windshield 17, the access door 16 and the outer wall plate 24 of the left side wall 15c, the transparent 18 and the outer wall plate 19 of the right side wall 15b, and the rear wall 15e included in the cockpit 15 shown is omitted, and the operator seat area C is open to the outside of the open cab 75. The operator seat area C is substantially the same as the space in the open cab 75 where the operator may be present for operation, and the operator seat area C is set on the upper side of the bottom wall 75f of the open cab 75, and the lower side boundary surface of the operator seat area C is at the same height position as the upper surface of the bottom wall 75f. Figure 22 to Figure 24The open cab 75 shown includes a top wall 75a and a plurality of pillars supporting the top wall 75a, and the upper boundary surface of the operator seat area C is located at a height position substantially equal to the lower surface of the top wall 75a. In an open cab of a type not including the top wall 75a, it is preferred to set the upper boundary surface of the operator seat area C at a position 1.5 to 2.0 m above the bottom wall 75f, although it also depends on the height of the operator.

[0114] exist Figure 22 to Figure 24 In the technology shown in the figure, the first signal transmitting antenna 31 as a transmitter is provided in the control seat 50. Specifically, the first signal transmitting antenna 31 is provided in the under-seat storage portion 27 of the control seat 50. The under-seat storage portion 27 is connected to the control seat 50. Fig. 20 and Fig.21 The control seat 50 shown is similarly located below the seat surface 50b of the control seat 50. The under-seat storage portion 27 is a box-shaped body that defines a storage space P2 for storing small items, and the storage space P2 is open to the front through an opening 28 on its front side. The opening 28 allows the small items to be taken in and out of the storage space P2 through the opening 28. The control seat 50 also includes a cover 29 that can open and close the opening 28. The first signal transmitting antenna 31 is arranged in the under-seat storage portion 27, directly below the seat surface 50b.

[0115] The effective range T of the first signal X1 output from the first signal transmitting antenna 31 is spherical with the first signal transmitting antenna 31 as the center. The radius of the effective range T corresponds to the output strength of the first signal transmitting antenna 31. The effective range T is set in a manner to cover the entire seat surface 50b, the entire under-seat storage portion 27, and a portion of the bottom wall 75f. On the other hand, the size of the effective range T is limited to not exceeding the left and right interfaces of the control seat area C. The effective range T may cover the entire backrest 50c of the control seat 50, or may only cover a portion of the backrest 50c.

[0116] according to Figure 22 to Figure 24 The technology shown, and Figure 19 to Figure 21 Similarly to the technology shown in the figure, as long as the operator carrying a legitimate portable key sits in the control seat 50, the controller (for example, Figure 3The main controller 34 shown in the figure sends and receives the first signal X1 and the second signal X2 with the portable key. Therefore, a person carrying the regular portable key 40 and sitting on the operating seat 50 can operate the hydraulic excavator without any hindrance. On the other hand, even if a person carries the regular portable key, when the person is outside the open cab 75, the portable key can be prevented from receiving the first signal X1. The position of the first signal transmitting antenna 31 in the operating seat 50 for obtaining these effects is not limited to the storage portion 27 under the seat. For example, the effects can also be obtained when the first signal transmitting antenna 31 is located inside the seat face 50b or the backrest 50c.

[0117] As described above, a construction machine is provided, which includes a cockpit and a portable key. Even if the portable key is outside the cockpit, in view of the above-mentioned actual situation, even if the opening of the cockpit is in an open state, the construction machine can be suppressed from accidentally moving. The construction machine includes a main frame, a cockpit, a transmitter, a portable key, and a controller. The cockpit is mounted on the main frame and allows an operator to board the cockpit. The transmitter is arranged inside the cockpit and sends a first signal. The portable key can be carried by the operator, can receive the first signal, and send a second signal as an authentication signal in response to the reception of the first signal. Based on the second signal, the controller determines whether the portable key corresponds to the construction machine, and when it is determined that it corresponds to the construction machine, sets the drive source of the construction machine to a startable operation state. The startable operation state is a state in which an operation for starting the drive source can be performed. The cockpit is arranged at a position offset in the frame width direction relative to the center line of the width direction frame. The width direction frame centerline is the centerline of the main frame in the width direction of the frame, and the frame width direction is the width direction of the main frame. The cockpit includes a pair of cockpit inner side walls and cockpit outer side walls, and the cockpit inner side walls and the cockpit outer side walls are opposite to each other in the frame width direction across the cockpit internal space accommodating the operator. The cockpit inner side wall is located closer to the width direction frame centerline than the cockpit outer side wall. An entrance and exit are formed on the cockpit outer side wall, and the entrance and exit allow the operator to enter and exit the cockpit internal space through the entrance and exit. The transmitter is installed on the cockpit inner side wall.

[0118] The transmitter is installed on the inner wall of the cockpit that is closer to the center line of the width direction frame than the outer wall of the cockpit. Therefore, it is not easy for an operator outside the cockpit to approach the transmitter compared to the case where the transmitter is set on, for example, the outer wall of the cockpit or the center of the cockpit. Therefore, when the operator holding the portable key is outside the cockpit, it is possible to effectively suppress the first signal output from the transmitter from being received by the portable key. In addition, the transmitter installed on the outer wall of the cockpit is separated from the entrance and exit of the outer wall of the cockpit by a certain distance at least in the width direction of the frame across the internal space of the cockpit. Therefore, even if the entrance and exit are open, the first signal is suppressed from leaking to the outside of the cockpit through the entrance and exit.

[0119] Preferably, the cockpit inner wall includes an outer shielding portion between the outer space of the cockpit inner wall and the transmitter. The outer shielding portion prevents the first signal from passing through the outer shielding portion from leaking from the transmitter to the outer space, thereby more reliably preventing the portable key located outside the outer shielding portion from receiving the first signal.

[0120] The inner wall of the cockpit may further include a non-shielding portion such as a transparent plate. The non-shielding portion is located at a position deviated from the outer shielding portion in the direction along the vertical plane, allowing the first signal to pass through the non-shielding portion. However, the cockpit further includes an inner shielding portion, which is located inside the cockpit between the non-shielding portion and the transmitter, and prevents the first signal from passing through the inner shielding portion from reaching the non-shielding portion from the transmitter, thereby suppressing the first signal from leaking through the non-shielding portion to the outside of the cockpit.

[0121] For example, at least a part of the inner shield portion may be included in a support member that supports equipment for operating the construction machine. This allows the support member to be used as the inner shield portion, thereby reducing the number of components and preventing leakage of the first signal.

[0122] The inner shielding portion may include, for example, at least one of an upper shielding wall covering the transmitter on the upper side of the transmitter, a front shielding wall covering the transmitter on the front side of the transmitter, and a rear shielding wall covering the transmitter on the rear side of the transmitter.

[0123] At least a portion of the inner shield portion may be included in a reinforcing member disposed along the inner wall surface of the outer shield portion in order to increase the rigidity of the inner wall of the cockpit. In this way, the reinforcing member also serves as the inner shield portion, thereby suppressing an increase in the number of components.

[0124] Alternatively, at least a part of the outer shield portion and the inner shield portion may be included in a cockpit pillar member erected on the main body frame so as to extend in the up-down direction.

[0125] Preferably, when the construction machine further includes a working device capable of performing working actions, the working device is arranged on the main frame and is located adjacent to the outer side of the inner wall of the cab in the width direction of the frame. The working device inhibits an operator holding the portable key from approaching the inner wall of the cab from the outer side of the inner wall of the cab, thereby inhibiting the first signal emitted from the transmitter installed on the inner wall of the cab from being received by the portable key on the outer side of the inner wall of the cab.

Claims

1. A construction machinery, characterized in that include: Main frame; A cockpit, which is mounted on the main frame and allows an operator to ride in; A transmitter is disposed inside the cockpit and transmits a first signal; a portable key, which can be carried by the operator and is capable of receiving the first signal and transmitting a second signal as an authentication signal in response to reception of the first signal; as well as The controller determines whether the portable key corresponds to the engineering machine based on the second signal, and when it is determined that the portable key corresponds to the engineering machine, sets the driving source of the engineering machine to a startable operation state, wherein the startable operation state is a state in which an operation for starting the driving source can be performed, wherein: The cockpit is arranged at a position offset in the width direction of the main frame relative to the width direction frame center line, the width direction frame center line being the center line of the main frame in the width direction of the main frame, i.e., in the frame width direction, The cockpit includes a pair of cockpit inner side walls and a cockpit outer side wall facing each other in the width direction of the frame across the cockpit inner space for accommodating the operator. The inner wall of the cockpit is located closer to the center line of the width direction frame than the outer wall of the cockpit, and an entrance is formed on the outer wall of the cockpit, and the entrance allows the operator to enter and exit the inner space of the cockpit through the entrance. The transmitter is mounted on the inner wall of the cockpit.

2. The construction machinery according to claim 1, characterized in that: The cockpit inner wall includes an outer shield portion interposed between an outer space of the cockpit inner wall and the transmitter, and the outer shield portion prevents the first signal from passing through the outer shield portion from leaking from the transmitter to the outer space.

3. The construction machinery according to claim 2, characterized in that: The cockpit inner wall further includes a non-shielding portion, the non-shielding portion is located at a position deviated from the outer shielding portion in a direction along the vertical plane, and allows the first signal to pass through the non-shielding portion. The cockpit further includes an inner shielding portion interposed between the non-shielding portion and the transmitter inside the cockpit and preventing the first signal from passing through the inner shielding portion from the transmitter to reach the non-shielding portion.

4. The construction machine according to claim 3, characterized in that: The non-shielding portion includes a transparent plate.

5. The engineering machine according to claim 3 or 4, characterized in that: At least a portion of the inner shield portion is included in a support member that supports equipment for operating the construction machine.

6. The construction machine according to any one of claims 3 to 5, characterized in that: The inner shield portion includes at least one of an upper shield wall covering the transmitter on an upper side of the transmitter, a front shield wall covering the transmitter on a front side of the transmitter, and a rear shield wall covering the transmitter on a rear side of the transmitter.

7. The construction machine according to any one of claims 3 to 6, characterized in that: At least a portion of the inner shield portion is included in a reinforcing member disposed along an inner wall surface of the outer shield portion in order to increase the rigidity of the inner wall of the cockpit, and is interposed between the transmitter and the non-shielding portion.

8. The construction machine according to any one of claims 3 to 7, characterized in that: At least a part of the outer shield portion and the inner shield portion is included in a cockpit pillar member erected on the main body frame so as to extend in the up-down direction.

9. The construction machine according to any one of claims 1 to 8, characterized in that Also includes: A working device capable of performing working actions is arranged on the main frame and is located adjacent to the outer side of the inner wall of the cab in the width direction of the frame.

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