JP2012241326A - Working machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reliably connect a cable side connector attached to a cable extended from an electrically-driven device and a machine side connector mounted on electric device equipment.SOLUTION: A cable side connector 46A is attached to a first cable 46 extended from an electric motor 34 fixed on a revolving frame 5. A box body 37 of first electric equipment 36 supported by the revolving frame 5 through vibration isolation mounts 38 has a connector fixing protrusion 39 where a first machine side connector 40 is provided thereon. Then, the cable side connector 46A of the first cable 46 is connected to the first machine side connector 40 and an edge portion of the first cable 46 is fixed to the box body 37 with a first clamp member 50. Thus, vibrations transmitting through the first cable 46 as well as the cable side connector 46A coincide, thereby enabling the cable side connector 46A and the first machine side connector 40 to be reliably connected.

Description

  The present invention relates to a construction machine such as a hydraulic excavator and a wheel loader, and more particularly to a construction machine including an electric device such as an electric motor for a swing device and an electric motor for a hydraulic pump.

  In general, a hydraulic excavator as a typical example of a construction machine has a vehicle body constituted by a lower traveling body that can be self-propelled and an upper revolving body that is mounted on the lower traveling body through a swirling wheel so as to be capable of turning. A work device for performing excavation work or the like is provided on the front side of the revolving structure.

  Here, a turning device for turning the upper turning body is provided between the lower traveling body and the upper turning body, and a hydraulic motor and an electric motor (electric device) are used in combination as a turning motor constituting the turning device. A so-called hybrid-type turning device has been proposed. On the other hand, hybrid hydraulic pumps that are driven by an engine and driven by an electric motor have been proposed as hydraulic pumps used in construction machines.

  By the way, an electric motor used for a swing motor includes an electric device containing an electric component such as an inverter circuit that converts a driving current supplied to the electric motor into a direct current and an alternating current, and an electric device for driving the electric motor. An electric device containing an electric component such as a capacitor for storing energy is connected via a cable. In this case, a cable-side connector is provided at the end of the cable connected to the electric motor, and the cable-side connector is connected to a device-side connector provided in the electric device, so that the electric The component and the electric motor can be electrically connected.

  By the way, the hydraulic excavator vibrates violently during excavation work or the like. Therefore, even if the cable side connector and the equipment side connector described above are connected, the connection terminal (contact) electrically connected to the cable is connected to the cable from the cable. When the vibration is transmitted, corrosion (fretting corrosion) due to fine sliding occurs on the contact surfaces of the connection terminals, and there is a possibility that problems such as contact failure and burnout may occur.

  On the other hand, in a hybrid excavator, in order to protect electrical devices such as a controller and a power storage device mounted on the vehicle body from vibration, a configuration in which these electrical devices are supported on the vehicle body via a vibration isolation mount is adopted. (For example, refer to Patent Document 1).

  However, when the electric device is attached to the vehicle body via a vibration isolation member in order to protect the electric device from vibration, the vibration transmitted to the electric motor is different from the vibration transmitted to the electric device. Excessive external force due to the difference between the vibration of the electric motor and the vibration of the electrical equipment acts on the connection terminal of the cable-side connector provided on the cable-side connector, and the connection terminal of the cable-side connector and the connection terminal of the equipment-side connector It is easy for contact failure to occur.

  In contrast, a connector has been proposed in which a plurality of protrusions are provided in the connector body into which the cable is inserted, and the cable is securely fixed to the connector body by the frictional force generated between the protrusion and the cable. ing. In this way, in the connector in which the cable is fixed to the connector body, vibration transmitted to the connection terminal via the cable can be suppressed, so that contact failure between the connection terminal of the cable side connector and the connection terminal of the device side connector is prevented. It can be reduced (see, for example, Patent Document 2).

JP 2010-270555 A JP-A-3-145079

  However, a cable such as a power cable connected to an electric motor mounted on a hydraulic excavator has a large diameter and a high rigidity because a large current flows. For this reason, when a hydraulic excavator generates vibration, this vibration is easily transmitted to the connection terminal of the cable side connector through the cable, and there is a problem such as poor contact or burnout between the connection terminal of the cable side connector and the connection terminal of the equipment side connector. There is a problem that will occur.

  On the other hand, in order to increase the strength of the connector against vibration, when the outer shape of the connector is increased in accordance with a large-diameter cable, the occupied space of the connector increases, so that the cable between the electric motor and the electric device is increased. There is a problem that the workability when arranging the service is reduced.

  The present invention has been made in view of the above-described problems of the prior art, and is provided in a cable-side connector provided on a cable extending from an electric device mounted on a vehicle body, and an electric device supported via a vibration isolation member. It aims at providing the construction machine which can connect between apparatus side connectors reliably and can prevent generation | occurrence | production of the above malfunctions.

  In order to solve the above-described problems, the present invention provides a self-propelled vehicle body, an electric device mounted on the vehicle body, and an electric component connected to the electric device in a box, and using the vibration isolation member. The present invention is applied to a construction machine including an electric device supported by a vehicle body and a cable connecting the electric device and the electric device.

  A feature of the configuration adopted by the invention of claim 1 is that the box of the electric device is provided with a connector mounting protrusion that is located on the outer surface side and protrudes with a smaller outer shape than the box, and the connector The mounting projection is provided with a device-side connector to which a cable-side connector provided at an end portion of the cable on the electric device side is connected, and the outer surface of the box of the electric device is located in the vicinity of the connector mounting protrusion. And a clamp member for fixing the end of the cable on the electric device side.

  According to a second aspect of the present invention, the box of the electric device is a three-dimensional structure surrounded by an upper surface, a lower surface and a side surface, and the box of the electric device is provided on the vehicle body with the lower surface down, The connector mounting projection is attached to at least the upper surface or the side surface of the box, and the connector mounting projection is attached to the vicinity of the cable-side connector of the cable among the upper surface or the side surface of the box provided with the connector mounting projection. The clamp member is configured to be attached to the remaining portion of the upper surface or the side surface of the box body provided with the connector mounting protrusion.

  According to a third aspect of the present invention, the box of the electric device has a three-dimensional structure surrounded by an upper surface, a lower surface, a front surface, a rear surface, a left side surface, and a right side surface, and the connector mounting protrusion includes an upper surface, a front surface, a rear surface, a left side surface, and A three-dimensional structure surrounded by a right side surface is provided, and the box of the electrical device is provided on the vehicle body with its lower surface facing down, and the connector mounting projection is any of the surfaces of the box except the lower surface. The device-side connector is provided on a surface of each surface of the connector mounting projection that is orthogonal to the installation surface of the connector mounting projection in the box, and the connector mounting projection is connected to the device-side connector. Are arranged so as to be shifted to the rear side of the box so that a space is formed on the front side of the surface on which the cable is provided. It is located on the front side of the surface on which the nectar is provided and is arranged on the installation surface of the connector attachment projection in the box, and the clamp member is on the installation surface of the connector attachment projection in the box. The connector mounting protrusion is mounted on the front side of the surface on which the device-side connector is provided.

  According to a fourth aspect of the present invention, a clamp fixing portion is provided on a surface of the box body on which the connector mounting protrusion is provided, and the clamp member is attached to the clamp fixing portion.

  According to a fifth aspect of the present invention, the box is provided with a cover that covers the device-side connector provided on the connector mounting protrusion and the cable-side connector connected to the device-side connector.

  According to a sixth aspect of the present invention, the electric device is connected to the electric device using a first cable, and the first electric device is connected to the electric device using a second cable. The second electric device is configured to accommodate an inverter circuit in the box of the first electric device, and a capacitor that stores electric energy in the box of the second electric device. It is in.

  According to the first aspect of the present invention, the device side connector is attached to the connector attachment protrusion provided on the box of the electric device, and the cable side connector provided on the cable extending from the electric device is connected to the device side connector. The end on the electric device side can be fixed to the box using a clamp member. As a result, both the end of the cable and the cable-side connector can be fixed to the box of the electric device, so that the vibration transmitted from the electric device to the cable, the vibration generated in the cable, and the electric device through the device-side connector The vibration transmitted to the cable side connector can be matched. As a result, even if the vibration transmitted to the electric device mounted on the vehicle body is different from the vibration transmitted to the electric device supported by the vehicle body via the vibration isolating member, an excessive external force is transmitted to the connection terminal of the cable side connector. It is possible to suppress the occurrence of corrosion (fretting corrosion) due to micro-sliding on the contact surface between the connection terminals of the cable-side connector and the device-side connector during machine operation. Can be prevented from occurring.

  And since it can suppress that the excessive external force by a vibration is transmitted to the connection terminal of a cable side connector, it is not necessary to enlarge a cable side connector and an apparatus side connector. As a result, the space occupied by each connector can be reduced, and the workability when routing each cable can be improved.

  According to the second aspect of the present invention, the vicinity of the cable-side connector in the cable is attached to the remaining part of the upper surface or the side surface of the box to which the connector attachment protrusion is attached, excluding the part to which the connector attachment protrusion is attached. By arrange | positioning, a cable can be reliably fixed using the clamp member attached to the said remaining site | part.

  According to invention of Claim 3, a space can be ensured in the front side of the surface in which the apparatus side connector is provided among the connector attachment protrusions attached to the box. Therefore, when the cable-side connector is connected to the device-side connector of the connector mounting protrusion, the cable-side connector can be stored within the installation surface of the connector mounting protrusion in the box. As a result, the cable-side connector connected to the device-side connector can be prevented from protruding outside from the installation surface of the connector mounting protrusion in the box, and the devices and cable-side connectors arranged around the electric device Can be prevented from interfering with each other.

  Moreover, the cable-side connector can be connected to the device-side connector from the horizontal direction by attaching the device-side connector to a surface orthogonal to the installation surface of the connector-mounting projection in the box of each surface of the connector mounting projection. . As a result, it is possible to prevent moisture due to rain water, condensation, or the like from passing through the cable and entering the connection portion between the cable-side connector and the device-side connector, thereby protecting each connector.

  According to invention of Claim 4, a clamp member is attached to the clamp fixture provided in the surface in which a connector attachment protrusion is provided among box bodies, The edge part of the cable in which the cable side connector was provided is clamped by this clamp member By doing so, the cable can be securely fixed to the box of the electric device.

  According to the invention of claim 5, by covering the device-side connector and the cable-side connector with the cover provided on the box, for example, when performing maintenance or inspection work on the electric device or the electric device, the operator mistakenly It is possible to prevent the connection between the device side connector and the cable side connector from being stepped on. Thereby, the apparatus side connector and the cable side connector can be protected, inadvertent damage can be prevented, and both can be securely connected over a long period of time.

  According to invention of Claim 6, while connecting between the cable side connector provided in the 1st cable, and the apparatus side connector provided in the 1st electric equipment reliably, one side provided in the 2nd cable Reliable connection between the cable-side connector and the device-side connector provided on the first electrical device, and between the other cable-side connector provided on the second cable and the device-side connector provided on the second electrical device can do.

1 is a front view showing a hydraulic excavator according to an embodiment of the present invention. It is a perspective view which shows an upper revolving body in the state which removed the front door and the rear door. It is a top view which shows the state which attached the engine, the turning apparatus, the 1st, 2nd electric equipment etc. on the turning frame. It is a perspective view which shows the state which attached the turning apparatus, the 1st, 2nd electric equipment, and the front partition plate on the turning frame. FIG. 5 is an exploded perspective view showing a state where a front partition plate in FIG. 4 is omitted and a cover is removed from a second electric device. It is a disassembled perspective view which shows a 1st electric equipment and a floor board. It is sectional drawing which looked at the attachment state of the 1st electric equipment with respect to a turning frame from the arrow VII-VII direction in FIG. It is a block diagram which shows the connection relation of the electric motor used for a turning apparatus, and the 1st, 2nd electric equipment. It is a perspective view similar to FIG. 5 which shows the 1st modification of this invention. It is a perspective view which shows the 1st electric equipment by the 2nd modification of this invention.

  Hereinafter, a construction machine according to an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 10 by taking as an example a case where the construction machine is applied to a hydraulic excavator. In the present embodiment, an electric motor used for a turning device will be described as an example of the electric device.

  In the figure, reference numeral 1 denotes a hydraulic excavator as a typical example of a construction machine. The hydraulic excavator 1 is a self-propelled crawler-type lower traveling body 2 and an upper swing that is rotatably mounted on the lower traveling body 2. A vehicle body is constituted by the body 3. A working device 4 is provided on the front side of the upper swing body 3 so as to be able to move up and down, and the working device 4 performs excavation work of earth and sand.

  Reference numeral 5 denotes a revolving frame serving as a base of the upper revolving structure 3, and the revolving frame 5 is formed in a thick flat plate shape and extends in the front and rear directions as shown in FIG. The left vertical plate 7 and the right vertical plate 8 which are erected on the left and right and extend in the front and rear directions while facing the left and right sides, the left extension beam 9 provided to protrude from the left vertical plate 7 to the left side, A right overhanging beam 10 extending rightward from the vertical plate 8, a left side frame 11 which is fixed to the front end side of each left overhanging beam 9 and extends in the front and rear directions, and a front end side of each right overhanging beam 10 The right side frame 12 that is fixed to the front and extends in the front and rear directions is roughly configured to form a strong support structure.

  Here, a turning device 31 described later is provided between the left and right vertical plates 7 and 8 at an intermediate portion in the front and rear directions of the bottom plate 6. On the other hand, the working device 4 is attached to the front end sides of the left and right vertical plates 7 and 8, and the counterweight 20 described later is attached to the rear end sides of the left and right vertical plates 7 and 8. Yes.

  Reference numeral 13 denotes an engine as a prime mover located on the front side of the counterweight 20 and disposed on the rear side of the swing frame 5. The engine 13 is located on the left and right vertical plates 7 and 8 on the left side of the swing frame 5. It is arranged in a horizontal state extending in the right direction. A cooling fan 13A is attached to the left end side of the engine 13, and a hydraulic pump 14 for supplying pressure oil for operation to various hydraulic actuators mounted on the hydraulic excavator 1 is attached to the right end side of the engine 13. It has been.

  A heat exchanger 15 is located on the left side of the engine 13 and mounted on the revolving frame 5. The heat exchanger 15 includes a support frame 16, a radiator 17 supported by the support frame 16, and an oil cooler 18. Etc., and is detachably attached to the revolving frame 5.

  Here, the support frame 16 of the heat exchanger 15 includes a front partition plate 16A facing the front partition cover 25 and the utility chamber 29, which will be described later, a rear partition plate 16B provided on the front side of the counterweight 20, The front partition plate 16A and the connection plate 16C for connecting the upper end sides of the rear partition plate 16B are roughly configured. The support frame 16 supports a radiator 17 that cools engine coolant, an oil cooler 18 that cools hydraulic oil, and the like.

  Reference numeral 19 denotes a cab provided on the left side of the front portion of the revolving frame 5, and the cab 19 defines a cab. Reference numeral 20 denotes a counterweight provided on the rear end side of the revolving frame 5, and the counterweight 20 balances the weight with the work device 4. A hydraulic oil tank 21 is provided on the right side of the front portion of the revolving frame 5. The hydraulic oil tank 21 stores hydraulic oil supplied to various hydraulic actuators.

  Next, reference numeral 22 denotes a building cover that is located on the front side of the counterweight 20 and is provided on the revolving frame 5. The building cover 22 includes the engine 13, the hydraulic pump 14, and the heat exchange mounted on the revolving frame 5. It covers the vessel 15 and the like. Here, the building cover 22 includes a top plate 23, a bonnet 24, a support frame 16 of the heat exchanger 15, a front partition cover 25, a left front door 26, a left rear door 27, and the like which will be described later. .

  The upper side of the building cover 22 is partitioned by the top plate 23 and the bonnet 24, the left side of the building cover 22 is partitioned by the left front door 26 and the left rear door 27, and the right side of the building cover 22 is the right side. It is partitioned by a door (not shown). Further, the front side of the building cover 22 is partitioned by the hydraulic oil tank 21 and the front partition cover 25, and the rear side of the building cover 22 is a rear partition plate 16 </ b> B that constitutes the support frame body 16 of the heat exchanger 15 and a counterweight. It is configured to be partitioned by 20.

  Reference numeral 25 denotes a front partition cover provided between the cab 19 and the heat exchanger 15, and the front partition cover 25 constitutes a part of the building cover 22. Here, the front partition cover 25 faces the support frame 16 (front partition plate 16A) of the heat exchanger 15 with a space in the front and rear directions, and partitions the left front side of the building cover 22.

  Reference numeral 26 denotes a left front door which is attached to the front partition cover 25 so as to be openable and closable. The left front door 26 is rotatably supported by the front partition cover 25 via a hinge member. The left front door 26 opens and closes a utility chamber 29 (to be described later) by rotating forward and backward about the position of the front partition cover 25.

  Reference numeral 27 denotes a left rear door provided on the rear side of the left front door 26. The left rear door 27 is connected to the rear partition plate 16B constituting the support frame 16 of the heat exchanger 15 via a hinge member. It is supported movably. The left rear door 27 opens and closes a heat exchanger front chamber 28B, which will be described later, by rotating forward and backward about the position of the rear partition plate 16B.

  A machine room 28 is formed in the building cover 22, and the machine room 28 includes an upper plate 23, a bonnet 24, a left front door 26, a left rear door 27 and a right door (not shown) constituting the building cover 22. ), A counterweight 20, and a hydraulic oil tank 21. The machine room 28 includes an engine room 28A and a heat exchanger front room 28B which are adjacent to each other with the heat exchanger 15 interposed therebetween.

  That is, 28A is an engine room in which the engine 13, the hydraulic pump 14 and the like are accommodated. The engine room 28A includes the top plate 23 of the building cover 22, the bonnet 24, the right door (not shown), and the heat exchanger 15. The support frame 16, the counterweight 20, and the hydraulic oil tank 21 are defined.

  On the other hand, 28B shows a heat exchanger front chamber formed on the opposite side of the engine chamber 28A across the heat exchanger 15. This heat exchanger front chamber 28 </ b> B is defined by the top plate 23 and the left rear door 27 constituting the building cover 22, and the heat exchanger 15, and is configured to be opened and closed by the left rear door 27. ing. In addition, a second electrical device 42 described later is provided in the heat exchanger front chamber 28B.

  29 is a utility room formed in the building cover 22 together with the machine room 28, and the utility room 29 includes an upper plate 23 and a left front door 26 constituting the building cover 22, and the support frame 16 of the heat exchanger 15. It is defined by the front partition plate 16A to be configured. Here, an air cleaner 30 for cleaning the intake air sucked into the engine 13 is disposed in the utility chamber 29. Further, the lower side of the utility chamber 29 is closed by a floor plate 35 described later, and a first electric device 36 described later is attached on the floor plate 35.

  Next, reference numeral 31 denotes a turning device mounted on the turning frame 5. The swivel device 31 is positioned between the left and right vertical plates 7 and 8 constituting the swivel frame 5 and is erected at the center of the bottom plate 6. Here, the turning device 31 turns the upper turning body 3 supported on the lower traveling body 2, and is roughly constituted by a hydraulic motor 32, an electric motor 34 to be described later, and a speed reducer 33. This is a so-called hybrid-type turning device in which the upper turning body 3 is driven to turn by the cooperation of the electric motor 32 and the electric motor 34.

  Reference numeral 34 denotes an AC electric motor as an electric device, and the electric motor 34 constitutes a rotation source of the turning device 31 together with the hydraulic motor 32. Here, as shown in FIGS. 4 and 5, the electric motor 34 is attached to the upper end portion of the speed reducer 33 that constitutes the turning device 31, and the speed reducer 33 is vibration-proof with respect to the bottom plate 6 of the turning frame 5. It is directly attached using bolts or the like without interposing a member or the like. A hydraulic motor 32 is attached to the upper end side of the electric motor 34.

  Next, the floor plate 35, the first electrical device 36, the anti-vibration mount 38, the second electrical device 42, and the first and second cables 46, which are main parts according to the present embodiment, are arranged in the utility chamber 29. , 47, the first and second clamp members 50, 51, etc. will be described.

  A floor plate 35 closes the lower side of the utility chamber 29. As shown in FIGS. 6 and 7, the floor plate 35 is formed in a rectangular frame shape as a whole. And the floor board 35 is attached to the turning frame 5 so that attachment or detachment is possible, and the 1st electric equipment 36 mentioned later is attached.

  Here, as shown in FIG. 6, the floor plate 35 includes a flat mounting surface portion 35A to which the first electrical device 36 is mounted, and an outer frame portion 35B bent upward from the outer peripheral edge of the mounting surface portion 35A. The mounting surface portion 35A is roughly constituted by a plurality of ribs 35C fixed to the upper surface of the mounting surface portion 35A and the outer frame portion 35B so as to partition the mounting surface portion 35A into a plurality of areas. Further, the mounting surface portion 35A is provided with a work hole 35D for attaching / detaching the floor plate 35 to / from the revolving frame 5, a large diameter hole 35E for attaching / detaching or visually observing a control valve disposed below the floor plate 35, and the like. It has been. Further, bolt insertion holes 35F are respectively provided at the four corners of the mounting surface portion 35A, and the bolts 35G inserted through the respective bolt insertion holes 35F are fastened to the revolving frame 5, whereby the floor plate 35 is turned into the revolving frame. 5 is detachably attached.

  On the other hand, at the central portion of the mounting surface portion 35A, four mount mounting holes 35H are provided at intervals in the front, rear, left, and right directions, and each of the mount mounting holes 35H has a vibration-proof mount 38 to be described later. The bolt 38D is inserted. In addition, in the vicinity of each mount mounting hole 35H, a small square-shaped rotation stop hole 35J is provided, and each rotation stop hole 35J is engaged with a rotation stop projection 38E of an anti-vibration mount 38 to be described later. It is the composition to do.

  Reference numeral 36 denotes a first electric device disposed in the utility chamber 29. The first electric device 36 is connected to the electric motor 34 using a first cable 46 described later. is there. Here, the first electric device 36 includes a box 37 described later, and an inverter circuit for converting a drive current supplied to the electric motor 34 from a direct current to an alternating current, in the box 37, In addition, electrical components (not shown) such as a chopper circuit for boosting and stepping down are accommodated.

  Reference numeral 37 denotes a box that forms the outer shell of the first electric device 36. The box 37 is formed by, as shown in FIG. 6 and the like, an upper surface 37A and a lower surface 37B that extend in the horizontal direction, and substantially perpendicular to the upper surface 37A. It is formed as a rectangular parallelepiped solid structure surrounded by the front surface 37C, the rear surface 37D, the left side surface 37E, and the right side surface 37F. Here, a cooling water passage (not shown) is provided inside the box body 37, and the heat generated from the electrical components accommodated in the box body 37 is cooled by the cooling water flowing through the cooling water passage. It has become. Further, a connector mounting protrusion 39 (described later) is integrally provided on the upper surface 37 </ b> A of the box body 37.

  Reference numeral 38 denotes a plurality of anti-vibration mounts as anti-vibration members provided between the box body 37 and the floor plate 35 constituting the first electric device 36. Each anti-vibration mount 38 is a first electric device. By supporting 36 in a vibration-proof state with respect to the revolving frame 5, large vibrations of the upper revolving structure 3 are prevented from being transmitted to the first electric device 36.

  Here, as shown in FIGS. 6 and 7, the anti-vibration mount 38 is attached to the flat device-side attachment portion 38 </ b> A attached to the lower surface 37 </ b> B of the box 37 constituting the first electric device 36 and the floor plate 35. A disc-like floor plate side mounting portion 38B to be mounted, an elastic body 38C such as rubber provided between the device side mounting portion 38A and the floor plate side mounting portion 38B, and a center portion of the floor plate side mounting portion 38B. The bolt 38D and the rotation projection 38E provided at the outer peripheral edge of the floor plate side mounting portion 38B and bent at a right angle along the bolt 38D from the floor plate side mounting portion 38B.

  Then, the device side mounting portion 38A of the vibration isolating mount 38 is attached to the lower surface 37B of the box body 37 using the bolt 38F, and the bolt 38D of the vibration isolating mount 38 is inserted into the mount mounting hole 35H of the floor plate 35 to fasten the nut. By doing so, the first electric device 36 can be supported on the floor plate 35 in a vibration-proof state via the vibration-proof mounts 38. At this time, the anti-vibration mount 38 engages with the anti-rotation hole 35J provided in the floor plate 35 by engaging the anti-rotation protrusion 38E provided on the floor plate side mounting portion 38B of the anti-vibration mount 38, so that the vibration isolation mount 38 is centered on the bolt 38D by vibration. It is possible to prevent the anti-vibration mount 38 from being loosened while preventing rotation.

  Next, the connector attachment protrusion 39 provided in the box body 37 will be described. Here, in the present embodiment, the case where the connector mounting protrusion 39 is provided on the upper surface 37A of the box 37 is illustrated, but the present invention is not limited to this, for example, the front surface 37C, the rear surface 37D, the left side surface 37E, the right side surface. It is good also as a structure which provides the connector attachment protrusion 39 in 37F.

  Reference numeral 39 denotes a connector mounting protrusion protruding on the upper surface 37A of the box body 37. The connector mounting protrusion 39 has a rectangular parallelepiped three-dimensional structure having an outer shape whose front and rear length dimensions are smaller than those of the box body 37. It is formed as a body. In other words, the connector mounting protrusion 39 faces the upper surface 37A of the box 37 and extends in the horizontal direction, and the front surface 39B, the rear surface 39C, the left side surface 39D, and the right side surface 39E that are substantially perpendicular to the upper surface 39A. It is formed in a rectangular parallelepiped shape surrounded by. The connector mounting protrusion 39 has an opening on the lower surface side and communicates with the inside of the box 37, and the cable is inserted into the box 37 through this opening.

  In this case, the connector mounting protrusion 39 is disposed at a position of the upper surface 37A of the box body 37 that is shifted to the rear surface 37D side, and the front surface 39B of the connector mounting protrusion 39 is behind the front surface 37C of the box body 37. Recessed (rear side 37D side). Thereby, the upper surface 37A of the box 37 is located in front of the front surface 39B of the connector mounting projection 39 except for the mounting portion 37A1 provided with the connector mounting projection 39 and the mounting portion 37A1 provided with the connector mounting projection 39. The remaining portion 37A2 is located.

  Reference numerals 40 and 41 denote first and second device-side connectors provided side by side on the front surface 39 </ b> B of the connector mounting protrusion 39. These first and second device-side connectors 40 and 41 are accommodated in the box body 37. Connected to an electrical component such as an inverter circuit. The first device-side connector 40 is connected to a later-described cable-side connector 46A, and the second device-side connector 41 is connected to a later-described cable-side connector 47A.

  Next, the 2nd electric equipment 42 accommodated in the heat exchanger front chamber 28B is demonstrated.

  That is, reference numeral 42 denotes a second electric device arranged in the heat exchanger front chamber 28B, and the second electric device 42 is connected to the first electric device 36 using a second cable 47 described later. It is what is done. Here, the second electrical device 42 stores a box body 43 and an electrical component (not shown) including a capacitor or a battery or the like in order to store electric energy stored in the box body 43 and driving the electric motor 34. ). The capacitor in the second electric device 42 charges regenerative energy generated by the electric motor 34 during braking of the electric motor 34 as electric energy and discharges the electric energy toward the electric motor 34. . The second electric device 42 is configured by connecting a plurality of capacitors.

  On the other hand, as shown in FIG. 5, the box 43 is formed as a rectangular parallelepiped three-dimensional structure extending in the front and rear directions surrounded by the upper surface 43A, the lower surface, the front surface 43B, the rear surface, the left side surface 43C, and the right side surface. The swing frame 5 is supported in a vibration-proof state via a vibration mount (not shown). In addition, a cooling water passage (not shown) is provided inside the box body 43, and heat generated from the electrical components accommodated in the box body 43 is cooled by cooling water flowing through the cooling water passage. ing.

  Next, the connector mounting projection 44 provided on the box 43 will be described. Here, in the present embodiment, the case where the connector mounting protrusion 44 is provided on the upper surface 43A of the box 43 is illustrated, but the present invention is not limited to this, for example, on the front surface 43B, the rear surface, the left side surface 43C, and the right side surface. The connector mounting protrusion 44 may be provided.

  Reference numeral 44 denotes a connector mounting projection that protrudes on the upper surface 43A of the box body 43. The connector mounting projection 44 is surrounded by the upper surface 44A, the front surface 44B, the rear surface 44C, the left side surface 44D, and the right side surface. It is formed as a rectangular parallelepiped three-dimensional structure having an outer shape with a small length in the front and rear directions. The connector mounting projection 44 has an opening on the lower surface side and communicates with the inside of the box body 43, and a cable is inserted into the box body 43 through the opening.

  In this case, the connector mounting protrusion 44 is disposed at a position of the upper surface 43A of the box body 43 that is shifted to the rear surface side, and the front surface 44B of the connector mounting protrusion 44 is rearward of the front surface 43B of the box body 43. I'm retracting. As a result, the upper surface 43A of the box body 43 is located in front of the front surface 44B of the connector mounting projection 44 except for the mounting portion 43A1 provided with the connector mounting projection 44 and the mounting portion 43A1 provided with the connector mounting projection 44. The remaining portion 43A2 is located.

  Reference numeral 45 denotes a third device-side connector provided on the front surface 44 </ b> B of the connector mounting protrusion 44, and the third device-side connector 45 is connected to an electrical component housed in the box body 43. A cable-side connector 47B described later is connected to the third device-side connector 45.

  Next, reference numeral 46 denotes a first cable for electrically connecting the electric motor 34 and the first electric device 36. A cable-side connector 46A having a connection terminal (not shown) disposed therein is provided at the end of the first cable 46 on the first electrical device 36 side. The cable-side connector 46 </ b> A of the first cable 46 is configured to be connected to the first device-side connector 40 attached to the connector attachment protrusion 39 of the first electric device 36. In this case, the vicinity of the cable-side connector 46A of the cable-side connector 46A and the first cable 46 is in the upper surface 37A (remaining portion 37A2) of the box 37 that constitutes the first electrical device 36 when viewed from above. Is in the box.

  Reference numeral 47 denotes a second cable that electrically connects the first electric device 36 and the second electric device 42. At both ends of the second cable 47, cable-side connectors 47A and 47B having connection terminals (not shown) disposed therein are provided. The cable-side connector 47A on one end side is connected to the second device-side connector 41 attached to the connector attachment projection 39 of the first electric device 36, and the cable-side connector 47B on the other end side is connected to the second device-side connector 41B. It is configured to be connected to a third device-side connector 45 attached to the connector attachment protrusion 44 of the electrical device 42.

  In this case, the cable side connector 47A and the portion of the second cable 47 in the vicinity of the cable side connector 47A are accommodated in the upper surface 37A of the box 37 constituting the first electric device 36 when viewed from above, and the cable side connector 47B and a portion of the second cable 47 in the vicinity of the cable-side connector 47B are accommodated in an upper surface 43A of the box body 43 constituting the second electric device 42 as viewed from above.

  Therefore, as shown in FIG. 8, the electric motor 34 and the first electric device 36 are electrically connected via the first cable 46, and the first electric device 36 and the second electric device 42 are connected. Are electrically connected via a second cable 47. Thereby, when the swivel device 31 is operated, the electric energy discharged from the second electric device 42 is supplied to the electric motor 34 through the first electric device 36 as an alternating current, and the electric motor 34 is driven to rotate. To do. On the other hand, when the swing device 31 is braked, the regenerative energy generated by the inertial rotation of the electric motor 34 is stored in the second electric device 42.

  Next, 48 and 49 indicate two mounting seats as clamp fixing portions provided on the box body 37 of the first electric device 36, and the mounting seats 48 and 49 are first and second described later, respectively. The clamp members 50 and 51 are fixed. Here, each mounting seat 48 and 49 is comprised, for example by a hexagon nut, and is being fixed to the remaining part 37A2 among the upper surfaces 37A which comprise the box 37 using means, such as welding.

  Reference numeral 50 denotes a first clamp member provided in the box 37 of the first electrical device 36 located in the vicinity of the connector mounting protrusion 39. Here, the first clamp member 50 is provided on the upper surface 37A of the box body 37 in a state where the vicinity of the cable side connector 46A of the first cable 46, for example, the end portion where the cable side connector 46A is provided is clamped. The mounting seat 48 is fastened with bolts 50A.

  In this way, the cable side connector 46A is connected to the connector mounting protrusion 39 provided on the box 37 of the first electric device 36, and the end of the first cable 46 is further connected to the first electric device 36. By fixing to the box body 37, the vibration transmitted to the end portion of the first cable 46 and the vibration transmitted to the cable side connector 46A are matched, and an excessive external force is prevented from being transmitted to the connection terminal of the cable side connector 46A. It has a configuration that can.

  Reference numeral 51 denotes a second clamp member provided in the box 37 of the first electric device 36 located in the vicinity of the connector mounting protrusion 39, and the second clamp member 51 is a cable of the second cable 47. A portion near the side connector 47A, for example, one end provided with the cable side connector 47A is clamped, and is fastened to a mounting seat 49 provided on the upper surface 37A of the box body 37 using a bolt 51A.

  Reference numeral 52 denotes a third clamp member provided in the box 43 of the second electric device 42 located in the vicinity of the connector mounting protrusion 44, and the third clamp member 52 is a cable of the second cable 47. A portion near the side connector 47B, for example, the other end provided with the cable side connector 47B is clamped, and is fastened to the upper surface 43A of the box 43 using bolts 52A.

  As described above, the cable-side connector 47A is connected to the connector mounting protrusion 39 provided on the box 37 of the first electric device 36, and one end of the second cable 47 is further connected to the first electric device 36. By fixing to the box body 37, the vibration generated in the second cable 47, the vibration transmitted to one end of the second cable 47, and the vibration transmitted to the cable-side connector 47A can be matched. On the other hand, after connecting the cable-side connector 47B to the connector mounting protrusion 44 provided on the box 43 of the second electric device 42, the other end of the second cable 47 is connected to the second electric device 42. By fixing to the box 43, the vibration generated in the second cable 47, the vibration transmitted to the other end of the second cable 47, and the vibration transmitted to the cable-side connector 47B can be matched.

  Thereby, even when the vibration transmitted to the first electrical device 36 and the vibration transmitted to the second electrical device 42 are different during machine operation, an excessive external force is applied to the connection terminal of the cable side connector 47A and the connection terminal of the cable side connector 47B. It is the structure which can suppress that is transmitted.

  Reference numeral 53 denotes a cover attached to the box 43 of the second electric device 42. The cover 53 is formed of a plate body bent into an L-shaped cross section, and is fixed to the box body 43 and the connector mounting projection 44 constituting the second electric device 42 using a plurality of bolts 53A. The cover 53 covers the third device-side connector 45 attached to the connector attachment protrusion 44 and the cable-side connector 47B of the second cable 47 connected to the third device-side connector 45. .

  Thereby, when performing maintenance and inspection work on the heat exchanger 15, it is possible that an operator carelessly steps on the third device side connector 45 or the cable side connector 47B of the second cable 47. The cover 53 can be blocked.

  The hydraulic excavator 1 according to the present embodiment has the above-described configuration. The hydraulic excavator 1 is self-propelled to the work site by the lower traveling body 2 and works while the upper revolving body 3 is swung by the swiveling device 31. Sediment excavation work is performed using the device 4.

  In this case, since the swing frame 5 vibrates greatly when the hydraulic excavator 1 is operated, the swing device 31 attached directly to the swing frame 5 also vibrates together with the swing frame 5.

  On the other hand, the first electrical device 36 disposed in the utility chamber 29 is supported by the floor plate 35 that closes the lower side of the utility chamber 29 via the anti-vibration mount 38. The transmitted vibration is smaller than the vibration transmitted to the turning device 31. In addition, the second electric device 42 disposed in the heat exchanger front chamber 28B is also supported by the swing frame 5 via a vibration-proof mount (not shown), and therefore is transmitted to the second electric device 42. The vibration is smaller than the vibration transmitted to the turning device 31. Thus, when the hydraulic excavator 1 is operated, the vibration transmitted to the turning device 31 and the vibration transmitted to the first electric device 36 and the second electric device 42 are different from each other.

  On the other hand, in the present embodiment, a connector mounting projection 39 protrudes from the upper surface 37A of the box 37 constituting the first electrical device 36, and the first device side is provided on the front surface 39A of the connector mounting projection 39. A connector 40 and a second device side connector 41 are provided. In addition, a connector mounting projection 44 is provided on the upper surface 43A of the box 43 constituting the second electrical device 42, and a third device side connector 45 is provided on the front surface 44A of the connector mounting projection 44.

  When connecting the electric motor 34 of the turning device 31 and the first electric device 36 using the first cable 46, the cable-side connector 46A provided on the first cable 46 is connected to the first cable 46. While connecting with the apparatus side connector 40, it is set as the structure which fixes the edge part in which the cable side connector 46A was provided among the 1st cables 46 with the 1st clamp member 50 arrange | positioned in the upper surface 37A of the box 37. FIG. .

  As described above, by fixing both the end portion of the first cable 46 where the cable-side connector 46A is provided and the cable-side connector 46A to the box 37 of the first electrical device 36, the first cable 46A is provided. The vibration transmitted to the cable 46 and the cable-side connector 46A can be matched. Therefore, even when the vibration transmitted to the electric motor 34 and the vibration transmitted to the first electrical device 36 are different, it is possible to suppress an excessive external force from being transmitted to the connection terminal of the cable-side connector 46A. As a result, the fine sliding that occurs on the contact surfaces of the connection terminals of the cable-side connector 46A and the first device-side connector 40 is suppressed, and there are problems such as corrosion (fretting corrosion), poor contact, and burnout. Generation | occurrence | production can be prevented and between the electric motor 34 and the 1st electric equipment 36 can be stably connected using the 1st cable 46. FIG.

  On the other hand, when the first electrical device 36 and the second electrical device 42 are connected using the second cable 47, the cable-side connector 47A provided at one end of the second cable 47 is connected to the connector. While connecting to the 2nd apparatus side connector 41 provided in the attachment protrusion 39, the one end part of the 2nd cable 47 is fixed with the 2nd clamp member 51 arrange | positioned in the upper surface 37A of the box 37. FIG. In addition, the cable-side connector 47B provided at the other end of the second cable 47 is connected to the third device-side connector 45 provided at the connector mounting protrusion 44, and the other end of the second cable 47 is connected. Is fixed by a third clamp member 52 disposed on the upper surface 43A of the box 43.

  Thereby, both the one end part in which the cable side connector 47A was provided among the 2nd cables 47, and the cable side connector 47A can be fixed to the box 37 of the 1st electric equipment 36, and 2nd The vibration transmitted to the cable 47 and the cable-side connector 47A can be matched. Moreover, both the other end part in which the cable side connector 47B was provided among the 2nd cables 47, and the cable side connector 47B can be fixed to the box 43 of the 2nd electric equipment 42, and 2nd The vibration transmitted to the cable 47 and the cable-side connector 47B can be matched.

  Therefore, according to the present embodiment, even when the vibration transmitted to the first electrical device 36 and the vibration transmitted to the second electrical device 42 are different, the cable-side connectors 47A and 47B provided on the second cable 47 are different. It is possible to suppress an excessive external force from being transmitted to the connection terminal. As a result, the fine sliding that occurs on the contact surfaces of the connection terminals of the cable side connector 47A and the second device side connector 41, and the cable side connector 47B and the third device side connector 45 is suppressed, and the accompanying corrosion. (Fretting corrosion), contact failure, burnout, and other problems are prevented, and the first electric device 36 and the second electric device 42 are stably connected using the second cable 47. can do.

  On the other hand, according to the present embodiment, it is possible to prevent an excessive external force from being transmitted to the connection terminal of the cable-side connector 46A provided in the first cable 46, so that the cable-side connector 46A and the first device-side connector There is no need to increase the size of 40. Further, since it is possible to suppress an excessive external force from being transmitted to the connection terminals of the cable side connectors 47A and 47B provided on the second cable 47, the cable side connectors 47A and 47B and the second and third device side connectors 41 and 45 need not be enlarged.

  As a result, the space occupied by the cable side connectors 46A, 47A, 47B, the first, second, and third device side connectors 40, 41, 45 can be reduced, and the electric motor 34 and the first electric device 36 can be reduced. And when the first and second cables 46 and 47 are routed between the first electric device 36 and the second electric device 42 can be improved.

  Further, the front surface 39B of the connector mounting projection 39 provided on the box body 37 of the first electrical device 36 is connected to the first device-side connector 40 by being shifted to the rear surface 37D side from the front surface 37C of the box body 37. The cable-side connector 46A of the first cable 46 and the cable-side connector 47A of the second cable 47 connected to the second device-side connector 41 are connected to the connector mounting protrusion 39 on the upper surface 37A of the box 37. Can be accommodated in the remaining portion 37A2 excluding the attachment portion 37A1. On the other hand, the front surface 44B of the connector mounting projection 44 provided on the box 43 of the second electrical device 42 is connected to the third device-side connector 45 by shifting it toward the rear side of the front surface 43B of the box 43. The cable-side connector 47B of the second cable 47 can be housed in the remaining portion 43A2 of the upper surface 43A of the box body 43 excluding the attachment portion 43A1 of the connector attachment protrusion 44.

  Thereby, it is possible to prevent the cable-side connector 46A of the first cable 46 and the cable-side connector 47A of the second cable 47 from protruding from the upper surface 37A of the box body 37 to the outside. On the other hand, the cable side connector 47 </ b> B of the second cable 47 can be prevented from projecting outside from the upper surface 43 </ b> A of the box body 43. As a result, it is possible to reliably prevent the cable side connectors 46A, 47A, 47B from interfering with the devices arranged around the first and second electric devices 36, 42.

  Further, the connector mounting protrusion 39 of the first electrical device 36 is formed as a rectangular solid structure, and the first and second device-side connectors 40 and 41 are mounted on the front surface 39B of the connector mounting protrusion 39, whereby the first The cable-side connector 46A of the first cable 46 can be connected to the first device-side connector 40 from the horizontal direction, and the cable-side connector 47A of the second cable 47 can be connected to the second device-side connector 41. Can be connected from the horizontal direction. Further, the connector attachment projection 44 of the second electrical device 42 is formed as a rectangular solid structure, and the third device side connector 45 is attached to the front surface 44B of the connector attachment projection 44, whereby the third device side connector. The cable side connector 47B of the second cable 47 can be connected to 45 from the horizontal direction.

  As a result, even if moisture due to rain water or dew condensation adheres to the first and second cables 46 and 47, the moisture travels along the first cable 46 due to a pressure difference between the inside and outside due to a temperature change or the like. It is possible to suppress intrusion into the connecting portion between the cable side connector 46 </ b> A and the first device side connector 40 by being sucked inside. In addition, moisture passes through the second cable 47 and enters the connecting portion between the cable-side connector 47A and the second device-side connector 41 and the connecting portion between the cable-side connector 47B and the third device-side connector 45. Can be suppressed.

  Furthermore, by attaching a cover 53 to the box 43 constituting the second electric device 42, the third device-side connector 45 and the cable of the second cable 47 connected to the third device-side connector 45 are provided. The side connector 47B can be covered with the cover 53. As a result, when maintenance or inspection work is performed on the heat exchanger 15 through the heat exchanger front chamber 28B, the operator carelessly installs the third device-side connector 45 or the cable-side connector 47B of the second cable 47. It can be prevented from stepping on and can be protected.

  In the above-described embodiment, the case where the cable body connector 47B of the second cable 47, the third device side connector 45, and the cover 53 that covers the box body 43 constituting the second electric device 42 are provided. Illustrated.

  However, the present invention is not limited to this. For example, as in the first modification shown in FIG. 9, a cover 54 is provided on the box body 37 constituting the first electrical device 36, and the cover 54 allows the first The cable-side connector 46A of the first cable 46, the cable-side connector 47A of the second cable 47, and the first and second device-side connectors 40 and 41 may be covered.

  Moreover, in embodiment mentioned above, the case where the attachment seats 48 and 49 which consist of a hexagon nut are attached to the upper surface 37A of the box 37 which comprises the 1st electric equipment 36 as a clamp fixing | fixed part is illustrated.

  However, the present invention is not limited to this. For example, as in the second modification shown in FIG. 10, bolt holes (internal thread holes) 55 and 56 are formed as clamp fixing portions, and the bolt holes 55 and 56 are formed in the bolt holes 55 and 56, respectively. It is good also as a structure which fixes a clamp member using the volt | bolt to screw.

  Further, in the above-described embodiment, the electric motor 34 used in the hybrid turning device 31 is described as an example of the electric device mounted on the vehicle body. However, the present invention is not limited to this, and can be applied to, for example, an electric hydraulic pump as a prime mover, or an electric motor for a hydraulic pump used in combination with the engine 13 as a hybrid prime mover.

1 Excavator (construction machine)
2 Lower traveling body (car body)
3 Upper swing body (car body)
34 Electric motor (electric device)
36 1st electric equipment 37, 43 Box 37A, 39A, 43A, 44A Upper surface 37B Lower surface 37C, 39B, 43B, 44B Front surface 37D, 39C, 44C Rear surface 37E, 39D, 43C, 44D Left side surface 37F, 39E Right side surface 37A1 , 43A1 Mounting part 37A2, 43A2 Remaining part 38 Anti-vibration mount (anti-vibration member)
39, 44 Connector mounting protrusion 40 First device side connector 41 Second device side connector 42 Second electrical device 45 Third device side connector 46 First cable 46A, 47A, 47B Cable side connector 47 Second Cable 48, 49 Mounting seat (clamp fixing part)
50 First clamp member 51 Second clamp member 52 Third clamp member 53, 54 Cover 55, 56 Bolt hole (clamp fixing portion)

Claims (6)

A self-propelled vehicle body, an electric device mounted on the vehicle body, an electric device connected to the electric device in a box and supported by the vehicle body using a vibration isolating member, and the electric motor In a construction machine comprising a cable connecting a device and the electric device,
The box of the electric device is provided with a connector mounting protrusion that protrudes with a smaller outer shape than the box located on the outer surface side thereof,
The connector mounting projection is provided with a device-side connector to which a cable-side connector provided at an end of the cable on the electric device side is connected,
A construction machine characterized in that a clamp member is provided on an outer surface of the box of the electric device, and is provided in the vicinity of the connector mounting protrusion to fix an end portion of the cable on the electric device side. The box of the electrical device is a three-dimensional structure surrounded by an upper surface, a lower surface and a side surface,
The box of the electrical device is provided on the vehicle body with its lower surface down,
The connector mounting projection is mounted on at least the upper surface or the side surface of the box,
The vicinity of the cable-side connector of the cable is configured to be disposed in the remaining portion of the upper surface or side surface of the box provided with the connector mounting protrusion except the portion where the connector mounting protrusion is mounted,
The construction machine according to claim 1, wherein the clamp member is configured to be attached to the remaining portion of the upper surface or the side surface of the box body provided with the connector attachment protrusion. The box of the electrical device is a three-dimensional structure surrounded by an upper surface, a lower surface, a front surface, a rear surface, a left side surface, and a right side surface,
The connector mounting protrusion is a three-dimensional structure surrounded by an upper surface, a front surface, a rear surface, a left side surface and a right side surface,
The box of the electrical device is provided on the vehicle body with its lower surface down,
The connector mounting protrusion is provided on any surface except the lower surface of each surface of the box,
Among the surfaces of the connector mounting projections, the device-side connector is provided on a surface orthogonal to the installation surface of the connector mounting projection in the box,
The connector mounting protrusion is arranged to be shifted to the rear side of the box so that a space is formed on the front side of the surface on which the device-side connector is provided,
The vicinity of the cable side connector of the cable is configured to be disposed on the installation surface of the connector mounting projection in the box located on the front side of the surface on which the device side connector of the connector mounting projection is provided,
2. The construction machine according to claim 1, wherein the clamp member is configured to be attached to a front side of a surface on which the device-side connector of the connector mounting protrusion is provided on an installation surface of the connector mounting protrusion in the box.   The construction machine according to claim 2 or 3, wherein a clamp fixing portion is provided on a surface of the box body on which the connector attachment protrusion is provided, and the clamp member is attached to the clamp fixing portion.   5. The structure according to claim 1, 2, 3, or 4, wherein the box is provided with a cover that covers the device-side connector provided on the connector mounting protrusion and the cable-side connector connected to the device-side connector. Construction machinery. The electric device includes a first electric device connected to the electric device using a first cable, and a second electric device connected to the first electric device using a second cable. Configure
An inverter circuit is accommodated in the box of the first electric device, and a capacitor for storing electric energy is accommodated in the box of the second electric device. Construction machinery as described in.

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