Working machinery

Abstract

To provide a work machine provided with an exhaust treatment device that ensures good maintainability of equipment such as an alternator placed around an engine while enabling efficient arrangement of the equipment in an engine room.SOLUTION: A work machine is provided with: an engine 12 of which an output shaft is projected to one side of a machine body in a left / right direction; a hydraulic pump 35 placed on the other side of the engine 12 in the left / right direction; an exhaust emission control system 70 arranged above the engine 12 to process exhaust gas exhausted from the engine 12; and an alternator 81 that is driven through rotational driving force of the output shaft, wherein the alternator 81 is arranged at a position behind the engine 12 and below an exhaust emission control device 70.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a work machine equipped with an alternator that is driven by the power of an engine to generate electricity.

Background Art

[0002] Conventionally, there has been a work machine equipped with an alternator that is driven by the power of an engine to generate electricity (for example, see Patent Document 1).

[0003] Patent Document 1 discloses a configuration in a backhoe, which is a type of work machine, in which an engine is mounted inside a bonnet provided with an opening / closing cover that can be opened rearward, with the axial direction of the output shaft in the left-right direction of the machine body. A compressor for an air conditioner is arranged at the upper part of the side surface on the output shaft side of the engine, and an alternator is arranged below the compressor and at a position rearward of the output shaft. The configuration disclosed in Patent Document 1 is intended to facilitate access to the alternator and the compressor from the rear side of the bonnet and to obtain good maintainability for these devices.

[0004] On the other hand, some work machines such as backhoes have a configuration in which an exhaust treatment device is provided for the engine. The exhaust treatment device has, for example, a DPF case as a diesel particulate filter (DPF), and is configured to introduce and purify exhaust gas, which is combustion gas discharged from the engine, into the DPF case. The DPF case is configured as, for example, a substantially cylindrical case.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] Exhaust system treatment devices are relatively large compared to alternators and other components. Therefore, if an attempt is made to maintain the alternator while locating the exhaust system treatment device around the engine, it becomes difficult to secure space for the exhaust system treatment device in the engine compartment under the bonnet. In particular, in relatively small work machines such as small excavators, the space in the engine compartment is limited, and the placement of the exhaust system treatment device may cause the driver's compartment located at the front of the engine compartment to be cramped or make it difficult to balance the weight of the machine.

[0007] This invention has been made in view of the above-mentioned problems, and aims to provide a work machine that, in a configuration equipped with an exhaust treatment device, can provide good maintainability for equipment such as alternators arranged around the engine, and can efficiently arrange equipment inside the engine compartment. [Means for solving the problem]

[0008] The work machine according to the present invention comprises an engine with an output shaft protruding from one side in the left-right direction of the machine body, a hydraulic pump located on the other side of the engine in the left-right direction, an exhaust treatment device located above the engine for processing exhaust gases discharged from the engine, and an alternator driven by the rotational power of the output shaft, wherein the alternator is located at the rear of the engine and below the exhaust treatment device.

[0009] Another aspect of the present invention relates to a work machine, which includes a compressor driven by the rotational power of the output shaft, wherein the compressor is located below the alternator.

[0010] Another aspect of the present invention relates to a work machine in which, in the work machine, the compressor is positioned at least partially behind the alternator.

[0011] Another aspect of the present invention relates to a work machine in which the engine is installed in an engine room located at the rear of the machine body, and comprises a shielding part that covers the engine room from the rear and has an opening that allows the engine room to face the outside, and a cover body that covers the opening so that it can be opened and closed, the alternator is positioned so that at least a portion of it overlaps with the opening range of the opening when viewed from the rear of the machine body, and the compressor is positioned so that at least a portion of it overlaps with the shielding part when viewed from the rear of the machine body.

[0012] In another aspect of the present invention, the work machine is characterized in that the exhaust treatment device has a cylindrical filter case that receives exhaust gas discharged from the engine, and the filter case is oriented so that its longitudinal direction is in the front-to-back direction of the machine.

[0013] In another aspect of the present invention, the work machine is configured such that the alternator is rotatably supported at one end relative to the engine, and fixedly supported at the other end by a support bracket extending toward the rear of the machine from a support member supporting the exhaust treatment device relative to the engine, in a position that allows rotation of the alternator.

[0014] Another aspect of the present invention relates to a work machine, which comprises a fan positioned on one side of the engine in the left-right direction, and a protective member detachably provided to the shielding portion and closing a part of the opening, wherein the protective member is provided such that at least a part of it overlaps the space between the engine and the fan when viewed from the rear of the machine.

[0015] In another aspect of the present invention, the work machine comprises a shielding body that forms the lower part thereof, and protruding portions that extend upward from both the left and right ends of the shielding body and together with the shielding body form the opening, and the protective member is provided for one of the left and right protruding portions. [Effects of the Invention]

[0016] According to the present invention, in a configuration provided with an exhaust gas treatment device, it is possible to obtain good maintainability for devices such as an alternator disposed around the engine, and it is possible to efficiently arrange the devices in the engine room.

Brief Description of the Drawings

[0017] [Figure 1] It is a left side view of an excavation working machine according to an embodiment of the present invention. [Figure 2] It is a plan view of an excavation working machine according to an embodiment of the present invention. [Figure 3] It is a plan view showing an arrangement configuration of devices on a base plate of an excavation working machine according to an embodiment of the present invention. [Figure 4] It is a rear view of an upper swing body according to an embodiment of the present invention. [Figure 5] It is a right side view of an engine according to an embodiment of the present invention. [Figure 6] It is a rear view of an engine according to an embodiment of the present invention. [Figure 7] It is a right side view showing a support configuration of an alternator according to an embodiment of the present invention. [Figure 8] It is a rear view showing a support configuration of an alternator according to an embodiment of the present invention. [Figure 9] It is a right rear perspective view showing a support configuration of an alternator according to an embodiment of the present invention. [Figure 10] It is a right side view showing a support configuration of a compressor according to an embodiment of the present invention. [Figure 11] It is a left rear perspective view showing a rear part of an upper swing body according to an embodiment of the present invention. [Figure 12] It is a rear view showing a counterweight and a bonnet according to an embodiment of the present invention. [Figure 13] It is an exploded perspective view showing a mounting structure of a shielding plate according to an embodiment of the present invention. [Figure 14]This is a plan cross-sectional view showing a mounting structure for a shielding plate according to one embodiment of the present invention. [Modes for carrying out the invention]

[0018] The present invention aims to improve the maintainability of equipment in the engine compartment and to make effective use of space in the engine compartment by devising the arrangement of equipment installed around the engine, such as the alternator, in a configuration equipped with an exhaust treatment device for processing engine exhaust. Embodiments of the present invention will be described below with reference to the drawings.

[0019] In the embodiments of the present invention, a slewing work vehicle, specifically an excavating work machine (shovel), will be used as an example of the work machine according to the present invention. However, the work machine according to the present invention is not limited to excavating work machines, which are a type of construction machinery, but can be broadly applied to other work machines such as bulldozers, crane work machines, compact track loaders, skid steer loaders, and wheel loaders.

[0020] The overall configuration of the excavation work machine 1 according to this embodiment will be described with reference to Figures 1 to 3. In the following description, the left and right sides facing forward (left in Figure 1) of the excavation work machine 1 will be referred to as the left and right sides of the excavation work machine 1, respectively. As shown in Figures 1 and 2, the excavation work machine 1 comprises a traveling device 2 as a self-propelled vehicle body, and an excavation device 3 and a soil removal device 4 as working parts attached to the traveling device 2.

[0021] The traveling device 2 is the main body of the excavation work machine 1 and has a pair of left and right crawler-type traveling sections 5, 5, a machine frame 6 which serves as a base and is interposed between the left and right traveling sections 5, 5, and a swivel frame 7 which is provided on the machine frame 6.

[0022] The running section 5 has a configuration in which tracks are wound around multiple rotating bodies such as sprockets and rollers supported by the machine frame 6. The running section 5 has a drive sprocket 5a, which is a drive wheel, at its rear end. The machine frame 6 has a center frame section 6a located in the middle between the left and right running sections 5, 5, and side frame sections 6b provided on both the left and right sides of the center frame section 6a.

[0023] Each running section 5 is equipped with a hydraulic motor 11 for driving. The hydraulic motor 11 is mounted on a predetermined part of the machine frame 6, such as the side frame portion 6b, in each running section 5, and is configured to rotate the drive sprocket 5a. The left and right hydraulic motors 11 drive the running sections 5, enabling the running device 2 to move forward and backward in a straight line and to turn left and right.

[0024] The slewing frame 7 is connected to the aircraft frame 6 via a slewing support section 8, which includes a slewing bearing, located on the upper side of the center frame section 6a, and is designed to slewing in either the left or right direction around its vertical axis. The slewing frame 7 rotates by the drive of a slewing motor (not shown), which is a hydraulic motor for rotation.

[0025] An operating unit 10 is provided on the slewing frame 7. A prime mover unit, including an engine 12 and other components, is provided at the rear of the slewing frame 7. To the right of the operating unit 10 is a tank housing 13 containing a fuel tank 14 and a hydraulic oil tank 15 (see Figure 2).

[0026] The driver's unit 10 is for operating the traveling device 2, the excavating device 3, and the soil removal device 4, and is located inside a cabin 16 that is mounted on the slewing frame 7. The cabin 16 has a frame that forms its outer shape and multiple window sections made of transparent material such as glass, and is generally constructed in a box shape. The cabin 16 has an opening / closing door 16a on the left side that opens and closes an entrance / exit for the operator to enter and exit the driver's unit 10.

[0027] Inside the cabin 16, a driver's seat 17 is provided on a driver's seat support platform located on the floor. Around the driver's seat 17 are a control panel with various controls, including a travel lever and other travel control controls, a work control lever and other work control controls for operating work equipment such as the excavation device 3 and the soil removal device 4, and switches.

[0028] Regarding the operation controls, a left-side operation lever 18 is provided on the left side of the driver's seat 17, and a right-side operation lever 19 is provided on the right side of the driver's seat 17 (see Figure 2). The excavation device 3 is operated using these left and right operation levers.

[0029] The base end of the excavation device 3 is attached to the left and right center of the front end of the slewing frame 7. The excavation device 3 has a boom 21 that forms its base end, an arm 22 connected to the tip of the boom 21, and a bucket 23 attached to the tip of the arm 22. The excavation device 3 also has a boom cylinder 24 that rotates the boom 21, an arm cylinder 25 that rotates the arm 22, and a bucket cylinder 26 that rotates the bucket 23.

[0030] The base end of the boom 21 is supported by a boom support bracket 27. The boom support bracket 27 is supported by a bracket mounting portion 28 protruding from the left and right center of the front end of the slewing frame 7, via a swing axis with the vertical direction as the rotation axis. The drilling device 3 is designed to swing left and right around the swing axis relative to the slewing frame 7 by the extension and retraction of a swing cylinder 29 provided between the boom support bracket 27 and the slewing frame 7. The boom cylinder 24, arm cylinder 25, and bucket cylinder 26 that constitute the drilling device 3, as well as the swing cylinder 29 that swings the drilling device 3, are all hydraulic cylinders operated by pressurized oil discharged by a hydraulic pump 35.

[0031] A soil removal device 4 is attached to the front of the machine frame 6. The soil removal device 4 includes a support frame 31 which includes a pair of left and right arms that extend in the front-rear direction between the left and right running sections 5, 5, a blade 32 which is a soil removal plate provided at the tip of the support frame 31, and a blade cylinder 33 which raises and lowers the blade 32 via the support frame 31. The blade cylinder 33 is a hydraulic cylinder which is operated by pressurized oil discharged by a hydraulic pump 35.

[0032] The support frame 31 is mounted to the machine frame 6 so as to be able to move up and down, with the rear ends of the left and right arms supported by support brackets provided on the front of the machine frame 6 so as to be able to move left and right with respect to the axis of rotation. The blade 32 is provided supported on the front end of the support frame 31. The blade cylinder 33 is provided mounted front to back between the machine frame 6 and the back of the blade 32.

[0033] The excavation work machine 1 has a lower traveling body consisting of a machine frame 6 and traveling sections 5, 5 supported on both its left and right sides, and an upper rotating body mounted on the lower traveling body so as to be rotatable. The upper rotating body consists of a rotating frame 7 and an operating section 10, engine 12, tank housing 13, etc., which are provided on the rotating frame 7.

[0034] A counterweight 41 is provided at the lower rear of the slewing frame 7. A bonnet 42 is provided above the counterweight 41 so as to be openable and closable. The bonnet 42 constitutes a cover portion that covers the rear of the slewing frame 7.

[0035] In the excavation machine 1 having the above configuration, the desired operation and work are performed by an operator seated in the driver's seat 17, who appropriately operates the travel lever, work operation lever, etc. Specifically, for example, by operating the travel lever, the travel device 2 is moved forward and backward in a straight line or left and right by operating the left and right travel sections 5. In addition, by operating the work operation lever, excavation work is performed by the excavation device 3, or soil removal work and leveling work is performed by the soil removal device 4.

[0036] The various device configurations provided on the rotating frame 7 will be explained below using Figures 2 to 14. Note that the bonnet 42 is not shown in Figure 4.

[0037] The tank housing section 13 is located on the right-hand portion of the base plate 40 (see Figure 3), which constitutes the slewing frame 7. The base plate 40 is a horizontally arranged plate-shaped frame member that forms the bottom surface of the slewing frame 7.

[0038] The tank housing section 13 is the part that houses the fuel tank 14, hydraulic oil tank 15, etc., within a tank chamber 20 partitioned on the base plate 40. The tank chamber 20 is partitioned off from the left and right central parts of the base plate 40 by a partition wall that includes a part of a vertical plate 43 provided on the base plate 40.

[0039] The tank compartment 20 is spatially continuous at its rear with the engine compartment 30, which houses the engine 12 located at the rear of the base plate 40. The left and right middle sections of the rear of the engine compartment 30 are covered by a counterweight 41 and a bonnet 42. A cabin 16 is provided on the left side of the tank compartment 20 on the slewing frame 7.

[0040] In the tank housing section 13, the portion to the right of the vertical plate 43 on the base plate 40 is covered by a plurality of exterior covers, which are covering members, thereby forming a tank chamber 20 that constitutes the housing space. Each of the plurality of exterior covers has a shape and size corresponding to the shape of the slewing frame 7 and the arrangement of the components on the slewing frame 7.

[0041] The tank housing 13 has an outer cover consisting of a right rear cover 51 that covers the right rear side of the tank chamber 20, a right front cover 52 that covers the right front side of the tank chamber 20, a right lower cover 53 that covers the lower right side of the tank chamber 20, and a front cover 54 that covers the front of the tank chamber 20. These covers are, for example, made of metal. The tank housing 13 also has an outer cover consisting of an upper cover 55 that covers the upper side of the tank chamber 20. The upper cover 55 is, for example, made of resin and is designed to be openable and closable.

[0042] Within the tank chamber 20, a fuel tank 14 is located at the front, and a hydraulic oil tank 15 is located behind the fuel tank 14. The fuel tank 14 is a fuel oil tank that contains fuel oil supplied to the engine 12. The hydraulic oil tank 15 is a tank that contains hydraulic oil that operates the various hydraulic actuators provided by the excavating machine 1. The various hydraulic actuators that operate by receiving pressurized oil supplied by the hydraulic oil include hydraulic cylinders such as the boom cylinder 24, arm cylinder 25, bucket cylinder 26 and swing cylinder 29, as well as the travel hydraulic motor 11 and the slewing motor.

[0043] The hydraulic oil tank 15 is located behind the fuel tank 14 and is positioned approximately in the center of the tank chamber 20 in the front-to-back direction. The fuel tank 14 and the hydraulic oil tank 15 are mounted and supported on the base plate 40. The fuel tank 14 and the hydraulic oil tank 15 are positioned adjacent to each other in the front-to-back direction. Within the tank chamber 20, a control valve 56 is positioned adjacent to the hydraulic oil tank 15 on its right side. The control valve 56 is a device for controlling the flow of pressurized oil supplied from the hydraulic oil tank 15 to multiple hydraulic actuators by the drive of the hydraulic pump 35. The operation of the drilling device 3 and the travel operation of the travel device 2 are performed by controlling the supply of pressurized oil to each hydraulic actuator.

[0044] On the base plate 40, a heat exchange unit 60 and an engine 12 are provided in the engine compartment 30, which is connected to the rear of the tank compartment 20. The heat exchange unit 60 is located on the right side, which is one side of the engine 12 in the left-right direction. The heat exchange unit 60 is a device configuration that has a heat exchange function for cooling the engine 12 and includes a radiator 61, an oil cooler 62, and a fan 63.

[0045] The radiator 61 is a device for cooling the coolant of the engine 12. The oil cooler 62 is a device for cooling the oil (hydraulic fluid) pumped by the hydraulic pump 35. Both the radiator 61 and the oil cooler 62 have an outer shape that is roughly rectangular in plan view. In plan view, the radiator 61 and the oil cooler 62 are arranged side by side, with the radiator 61 at the rear and the oil cooler 62 at the front, with their longitudinal directions perpendicular or approximately perpendicular to the axial direction of the output shaft 65 of the engine 12.

[0046] Fan 63 is a cooling fan that rotates in conjunction with engine 12 and blows air toward engine 12. Fan 63 is positioned between the right side of engine 12 and the radiator 61 and oil cooler 62. Fan 63 draws cooling outside air into the engine compartment 30 through multiple openings 51a (see Figure 4) formed in the right rear cover 51, cooling the radiator 61, oil cooler 62, etc.

[0047] The engine 12 is mounted at the rear of the base plate 40, with the axial direction of the output shaft 65 approximately aligned to the left or right. In other words, the engine 12 is mounted transversely so that the axial direction of the output shaft 65 approximately coincides with or coincides with the left or right direction of the aircraft.

[0048] In this embodiment, the engine 12 is positioned horizontally such that, in a plan view, the axial direction of the output shaft 65 is tilted by approximately 5 to 8 degrees counterclockwise (leftward) from the left-right direction. The engine 12 is mounted on a base plate 40 with vibration isolation support at multiple points via vibration isolation members 66 and the like.

[0049] Engine 12 has an output shaft 65 protruding from the right side, which is one side of the aircraft in the lateral direction. The output shaft 65 is located at the lower part of the right side of engine 12, approximately in the front-to-back center (see Figure 5). Engine 12 is a diesel engine that receives fuel from fuel tank 14.

[0050] The hydraulic pump 35 is located on the left side of the engine 12, which is the other side in the left-right direction. In other words, the hydraulic pump 35 is located on the opposite side of the output shaft 65 of the engine 12 in the axial direction from the protruding side of the output shaft 65. The hydraulic pump 35 has its rotating shaft connected to the drive shaft of the engine 12 via a coupling. The hydraulic pump 35 is driven in conjunction with the rotation of the drive shaft of the engine 12 and sends hydraulic fluid from the hydraulic fluid tank 15 to various hydraulic actuators via the control valve 56.

[0051] The engine 12 is equipped with an exhaust gas purification device 70 for purifying the exhaust gases from the engine 12. The exhaust gas purification device 70 is an example of an exhaust treatment device that is located above the engine 12 and processes the exhaust gases discharged from the engine 12. The combustion gases generated in the combustion chamber of the engine 12 are discharged outside the engine room 30 via the exhaust gas purification device 70.

[0052] The exhaust gas purification device 70 has a DPF case 71, which is a diesel particulate filter case, as a cylindrical filter case that receives the exhaust gas discharged from the engine 12. The exhaust gas purification device 70 purifies the exhaust gas by introducing the exhaust gas from the engine 12 into the DPF case 71 and removing particulate matter such as soot contained in the exhaust gas.

[0053] The DPF case 71 has a diesel oxidation catalyst and a soot filter installed inside the case. The diesel oxidation catalyst is an oxidation catalyst such as platinum that generates nitrogen dioxide (NO2). The soot filter is a honeycomb structure filter that continuously oxidizes and removes collected particulate matter at a relatively low temperature. Inside the DPF case 71, the diesel oxidation catalyst and the soot filter are arranged in series with respect to the exhaust gas flow, with the diesel oxidation catalyst on the upstream side and the soot filter on the downstream side. The diesel oxidation catalyst and soot filter remove particulate matter, mainly black smoke, from the exhaust gas of the engine 12 passing through the DPF case 71, and also reduce carbon monoxide (CO) and hydrocarbons (HC) in the exhaust gas.

[0054] The DPF case 71 is configured as a substantially cylindrical case. In the DPF case 71, the longitudinal direction (axis direction of the cylinder) of the substantially cylindrical outer shape is the direction of exhaust gas flow within the case. The DPF case 71 is installed with its longitudinal direction oriented in the front-rear direction or substantially in the front-rear direction of the machine. In this embodiment, the DPF case 71 is arranged so that its longitudinal direction is perpendicular to the axis direction of the output shaft 65 of the engine 12 when viewed from above. A mounting plate 71c is provided on the rear end face of the DPF case 71, which is removed when replacing the filter inside the DPF case 71. By removing the mounting plate 71c, the filter inside the DPF case 71 can be removed.

[0055] The DPF case 71 is located above the engine 12. The DPF case 71 has approximately the same dimensions as the engine 12 in the front-to-back direction and is positioned almost entirely above the engine 12. In the left-to-right direction, the DPF case 71 is located above the right side of the engine 12.

[0056] The DPF case 71 is fixedly supported at two points, front and rear, by a front support stay 75 and a rear support stay 76, relative to the engine 12. The front support stay 75 is fixed to the front of the upper right side of the engine 12 and protrudes upward from the engine 12, supporting the front of the DPF case 71 from below and embracing the front of the DPF case 71 together with a retaining belt 77 that runs along the outer circumference of the DPF case 71. The rear support stay 76 is fixed to the rear of the upper right side of the engine 12 and protrudes upward from the engine 12, supporting the rear of the DPF case 71 from below by being fixed to the lower part of the flange portion 71a provided at the rear of the DPF case 71 with bolts or the like.

[0057] One end (downstream side) of the exhaust pipe 72, which discharges exhaust gas from the engine 12, is connected to the DPF case 71. The DPF case 71 receives the connection to one end of the exhaust pipe 72 at its front left side. The other end (upstream side) of the exhaust pipe 72 is connected to the exhaust gas outlet side of a turbocharger (not shown) provided on the exhaust manifold that constitutes the exhaust gas outlet section of the engine 12. The exhaust gas from the engine 12 is introduced into the DPF case 71 through the exhaust pipe 72.

[0058] An outlet pipe 73 for discharging exhaust gas from the DPF case 71 is provided at the rear of the DPF case 71. The outlet pipe 73 protrudes upward from the top of the DPF case 71. The outlet pipe 73 penetrates the upper surface 42a of the bonnet 42 and protrudes upward from the upper surface 42a. A tailpipe 74, which together with the outlet pipe 73 constitutes the exhaust pipe portion of the exhaust gas purification device 70, is attached to the upper surface 42a of the bonnet 42.

[0059] The excavation work machine 1 includes, as devices installed around the engine 12, an alternator 81 driven by the rotational power of the output shaft 65 of the engine 12, and a compressor 82 driven by the rotational power of the output shaft 65. Both the alternator 81 and the compressor 82 are located on the right side of the engine 12, which is the side facing the output shaft 65.

[0060] The alternator 81 is driven by the engine 12 to generate electricity and output power. The alternator 81 can be used as a power source or as a generator for storing energy in a battery.

[0061] The compressor 82 is a compressor for the air conditioning unit of the excavating machine 1, and is driven by the engine 12 to compress the air conditioning gas (refrigerant). The conditioned air generated by the air conditioning unit is pumped through a duct (not shown) and blown out from multiple outlets provided in the cabin 16. The air conditioning unit is located below the driver's seat 17.

[0062] The alternator 81 is driven by the rotational power transmitted from the output shaft 65 of the engine 12 via a first belt drive mechanism 91. The first belt drive mechanism 91 includes an output pulley 93 attached to the output shaft 65, an alternator input pulley 94 provided for the alternator 81, and a first belt 95 wrapped around these pulleys.

[0063] The output pulley 93 is fixed to the output shaft 65, and its rotation axis is aligned with the rotation axis of the output shaft 65, allowing it to rotate integrally with the output shaft 65. The output pulley 93 is a so-called double pulley and has two adjacent outer grooves in the direction of the rotation axis. The first belt 95 engages with the groove on the right side (front side in Figure 5) of the output pulley 93. The alternator input pulley 94 is located on the right side of the alternator 81 and is fixed to the rotation axis 81a of the alternator 81, which is parallel to the axial direction of the output shaft 65. The alternator input pulley 94's rotation axis is aligned with the rotation axis 81a of the alternator 81, allowing it to rotate integrally with the rotation axis 81a.

[0064] Above the output pulley 93 is a fan pulley 97 for rotating the fan 63. The fan pulley 97 is rotatably mounted on the right side of the engine 12 with respect to a support located above the output shaft 65, parallel to the output shaft 65 in its axial direction. The fan pulley 97, together with the output pulley 93 and the alternator input pulley 94, is wound around the first belt 95 to form the first belt drive mechanism 91, and receives the rotational power of the output shaft 65. The fan 63 is mounted to rotate integrally with the fan pulley 97 and rotates in conjunction with the rotation of the output shaft 65.

[0065] The compressor 82 is driven by the rotational power transmitted from the output shaft 65 of the engine 12 via a second belt drive mechanism 92. The second belt drive mechanism 92 includes an output pulley 93 attached to the output shaft 65, a compressor input pulley 98 provided for the compressor 82, and a second belt 99 wrapped around these pulleys.

[0066] The second belt 99 engages with the groove on the left side (rear side in Figure 5) of the output pulley 93. In other words, with respect to the axial direction of the output shaft 65, the compressor input pulley 98 is located to the left of the alternator input pulley 94, and the second belt 99 is positioned to the left of the first belt 95. The compressor input pulley 98 is located on the right side of the compressor 82 and is fixed to the rotation axis 82a of the compressor 82, which is parallel to the axial direction of the output shaft 65. The compressor input pulley 98 aligns its rotation axis with the axial direction of the rotation axis 82a of the compressor 82 and rotates integrally with the rotation axis 82a.

[0067] As described above, in the configuration in the engine room 30 which includes an engine 12, a hydraulic pump 35, an exhaust gas purification device 70, an alternator 81, and a compressor 82, the alternator 81 is positioned behind the engine 12 and below the exhaust gas purification device 70.

[0068] As shown in Figure 5, the alternator 81 is located on the right side of the engine 12, at the rear of the upper part of the engine 12. The alternator 81 is positioned behind the output shaft 65, which is located approximately in the center in the front-rear direction. The entire alternator 81 is positioned behind the output pulley 93 in the front-rear direction. In the vertical direction, the alternator 81 is positioned above the fan pulley 97, and is positioned diagonally above and behind the fan pulley 97.

[0069] Furthermore, the alternator 81 is positioned below the rear end of the DPF case 71 in the front-rear direction. More specifically, the alternator 81 is positioned entirely or substantially entirely below the portion of the DPF case 71 that is rearward of the flange portion 71a on which the outlet pipe 73 is located on the upper side.

[0070] Furthermore, as shown in Figure 5, the compressor 82 is positioned below the alternator 81. The alternator 81 and the compressor 82 have roughly cylindrical external shapes, with their relative sizes to the engine 12 being approximately the same. In particular, the alternator 81 is slightly larger than the compressor 82. The upper end of the compressor 82 is positioned lower than the lower end of the alternator 81 in the vertical direction.

[0071] Furthermore, the compressor 82 is positioned at least partially behind the alternator 81. That is, the compressor 82, located below the alternator 81, is positioned behind the alternator 81 in the longitudinal direction. Therefore, in the longitudinal direction, the rotation axis 82a of the compressor 82 is positioned behind the rotation axis 81a of the alternator 81.

[0072] In this embodiment, the compressor 82 is positioned such that approximately half of its front end overlaps approximately half of the rear end of the alternator 81 in the front-rear direction (see Figure 5). With this arrangement, the rear end of the compressor 82 is positioned behind the DPF case 71 in the front-rear direction.

[0073] Furthermore, the alternator 81 and the compressor 82 are positioned so that they overlap almost entirely in the left-right direction (see Figure 6). Therefore, in a plan view, the compressor 82 is positioned so that approximately the front half overlaps the rear of the alternator 81.

[0074] Furthermore, the alternator 81 and compressor 82, which are positioned to overlap overall in the left-right direction, are positioned so that, in relation to the DPF case 71, they overlap the DPF case 71 entirely or substantially entirely, except for the rightmost end, in the left-right direction. In other words, the alternator 81 and compressor 82 are positioned below the DPF case 71 entirely or substantially entirely in the left-right direction. Therefore, in a rear view, the DPF case 71, alternator 81, and compressor 82 are arranged vertically in a line along the vertical direction (see Figure 6). In this embodiment, the DPF case 71, alternator 81, and compressor 82 are arranged at substantially equal intervals in the vertical direction.

[0075] The support configuration of the alternator 81 will be explained using Figures 7 to 9. The alternator 81 is provided such that one end, the lower end, is rotatably supported relative to the engine 12, and the other end, the upper end, is fixedly supported by an upper support bracket 100, which is a support bracket provided on the engine 12 side, so as to be able to change position and allow rotation of the alternator 81. In other words, the alternator 81 is rotatably supported relative to the engine 12 at the lower end as a rotatable support part, and at the upper end as a movable support part so as to be movable.

[0076] The alternator 81 is supported at its lower pivot support portion so as to be rotatable with respect to a lower support bracket 101 attached to the right side of the engine 12, with the pivot axis being in a direction that coincides with (is parallel to) the axial direction of the rotation axis 81a. The lower support bracket 101 has a fixed surface portion 101a that follows the right side of the engine 12, and a horizontal support surface portion 101b that is bent at a right angle to the left from the upper end of the fixed surface portion 101a.

[0077] The lower support bracket 101 has its fixed surface portion 101a fixed to the right side of the engine 12 at multiple points by fixing bolts 102. of On the rear side of the support surface portion 101b, there is a support cylinder portion 103, which is a cylindrical portion with both ends open, with the central axis direction coinciding with the axial direction of the rotation axis 81a. The support cylinder portion 103 is fixed to the support surface portion 101b by welding or the like.

[0078] On the other hand, the alternator 81 has two lower support projections 81b on the lower end side of the housing that forms its exterior, facing each other in the axial direction of the rotating shaft 81a. The two lower support projections 81b are provided on both sides of the rotating shaft 81a of the alternator 81, spaced apart in the axial direction of the rotating shaft 81a, on the lower side of the cylindrical main body portion of the housing of the alternator 81.

[0079] The alternator 81 is pivotally supported by a support cylinder 103 positioned between the left and right lower support projections 81b, with a lower support bolt 104 passing through the left and right lower support projections 81b and the support cylinder 103 as the support axis. The lower support bolt 104 is inserted from the right lower support projection 81b side, with its tip protruding to the left from the left lower support projection 81b and screwed into a nut 105 to fix the alternator 81. A cylindrical collar 106, through which the lower support bolt 104 passes, is interposed between the support cylinder 103 and the left lower support projection 81b.

[0080] The alternator 81 is movably supported by the upper support bracket 100 at its upper movable support portion. The upper support bracket 100 extends towards the rear of the machine from the rear support stay 76, which is a support member that supports the DPF case 71 of the exhaust gas purification device 70 relative to the engine 12.

[0081] The rear support stay 76 has a fixed surface portion 76a that follows the right side of the engine 12, and a support surface portion 76b that is bent at a right angle from the rear of the upper part of the fixed surface portion 76a toward the left, with the front-to-back direction being approximately the thickness direction. The lower part of the fixed surface portion 76a is fixed to the right side of the engine 12 at multiple points by fixing bolts 110, and the upper part extends upward above the engine 12. The support surface portion 76b is the part that receives the fixing of the flange portion 71a of the DPF case 71 by passing through a fastener such as a bolt 111. The bolt 111 passes through the support surface portion 76b and the flange portion 71a and is screwed into a nut 112.

[0082] The upper support bracket 100 is fixed to the fixed surface portion 76a of the rear support stay 76 and extends toward the rear. The upper support bracket 100 has a fixed surface portion 121 which is the part fixed to the rear support stay 76, an arm portion 122 which extends toward the rear from the fixed surface portion 121, and a locking surface portion 123 which extends toward the right from the rear end of the arm portion 122.

[0083] The upper support bracket 100 is fixed to the rear support stay 76 at multiple points by fixing bolts 124, with the fixing surface portion 121 overlapping the upper right side of the fixing surface portion 76a of the rear support stay 76. The arm portion 122 is a plate-shaped portion with the thickness direction approximately in the left-right direction and extends horizontally approximately in the front-rear direction. The locking surface portion 123 is a plate-shaped portion that forms approximately a right angle with the arm portion 122 in a plan view.

[0084] On the other hand, the alternator 81 has an upper support projection 81c on the upper end side of the housing. The upper support projection 81c of the alternator 81 is located on the opposite side (approximately point-symmetric) from the lower support projection 81b with respect to the rotation axis 81a when viewed in the axial direction of the rotation axis 81a. The upper support projection 81c is located in approximately the same position as the right lower support projection 81b in the axial direction of the rotation axis 81a.

[0085] The alternator 81 is supported by a guide block 131, which is roughly rectangular in shape and located to the right of the arm portion 122, and an upper support bolt 132, which is screwed into the upper support projection 81c and passes through the arm portion 122, as its support axis. The arm portion 122 has a guide hole 122a that extends in an arc shape when viewed in the axial direction of the rotation axis 81a, through which the upper support bolt 132 passes. The guide hole 122a has a shape that follows an arc centered on the axis position of the lower support bolt 104, which is the rotation center of the rotation support portion of the alternator 81, and allows the upper support bolt 132 to move relative to the upper support bracket 100 as the alternator 81 rotates.

[0086] The guide block 131 has an upper support bolt 132 passing through it at its lower end and a guide bolt 133 passing through it at its upper end. The guide bolt 133 is provided in a direction perpendicular to the axial direction of the upper support bolt 132 in a plan view, and passes through the locking surface 123 by an upper-open recess 123a formed in the locking surface 123, with its head 133a locked to the rear side of the locking surface 123. A positioning nut 134 is screwed onto the rear side of the guide block 131 on the guide bolt 133.

[0087] With the alternator 81 support configuration described above, loosening the fastening by the lower support bolt 104 of the rotatable support part allows the alternator 81 to rotate around the lower support bolt 104 as an axis. In this state, operating the guide bolt 133 in the movable support part moves the guide block 131 on the guide bolt 133, adjusting the position of the alternator 81 in the rotational direction (see arrow A1 in Figure 7) around the lower support bolt 104.

[0088] As the position of the guide block 131 on the guide bolt 133 is adjusted, the upper support bolt 132 moves along the arc shape of the guide hole 122a, and the guide bolt 133 moves up and down along the recess 123a of the locking surface portion 123. The tension of the first belt 95 is adjusted by adjusting the rotational position of the alternator 81. The adjustable angular range for the rotation of the alternator 81 is, for example, about 20 to 30 degrees.

[0089] The compressor 82, like the alternator 81, is rotatably supported on its lower side as a pivot support and movably supported on its upper side as a movable support, in order to adjust the tension of the second belt 99.

[0090] The compressor 82 has two lower support projections 82b that protrude from the lower side of the housing that forms its exterior (see Figures 6 and 10). The compressor 82 fastens and fixes each lower support projection 82b to each side portion 141b of the lower support bracket 141, which forms a roughly "U" shape when viewed from the rear by its lower surface portion 141a and left and right side portions 141b, using bolts 142.

[0091] The lower support bracket 141 has a support surface 141c formed by extending the right side portion 141b downward, and is rotatably supported by the lower support bolt 172 as a support axis with respect to the support plate portion 171a of the support stay 171 provided on the lower side of the lower support bracket 141. The axial direction of the central axis of the lower support bracket 141, which is the axis of rotation of the lower support bracket 141, is aligned (parallel) to the axial direction of the rotation axis 82a.

[0092] The lower support bolt 172 is screwed into the support plate portion 171a from the left side, passing through the support surface portion 141c, and fixing the lower support bracket 141 to the support stay 171. The lower support bolt 172 extends from the support surface portion 141c to the left as a hexagonal columnar operating portion 172a with a hexagonal cross-section, and the right end is a threaded portion that is screwed into the support plate portion 171a. The support stay 171 is fixed on a roughly "L" shaped mounting bracket 140, which is a predetermined support member provided at the lower rear of the engine 12 (see Figure 5). The mounting bracket 140 is the member that receives the attachment of the vibration damping member 66 on the right rear side.

[0093] On the other hand, the compressor 82 has an upper support projection 82c that protrudes from the upper side of the housing at the upper movable support portion (see Figure 10). The compressor 82 is supported by an upper support bracket 143 that is fixed to the lower support bracket 101 which supports the lower side of the alternator 81 and extends toward the rear, by an upper support bolt 144 that passes through the upper support bracket 143. The front end of the upper support bracket 143 is fixed to the lower support bracket 101 by a fixing bolt 145 with the rear part of the lower part of the fixing surface portion 101a of the lower support bracket 101 overlapped to the left.

[0094] The upper support bolt 144 passes through the support arm 146 fixed to the upper support bracket 143, and also passes through the arc-shaped guide hole 143a, and is screwed into the upper support projection 82c. The guide hole 143a has a shape that follows an arc centered on the axis position of the lower support bolt 172, which is the pivot point of the rotation support part of the compressor 82, and allows the upper support bolt 144 to move relative to the upper support bracket 143 as the compressor 82 rotates.

[0095] As shown in Figure 10, the support arm 146 extends its upper part to the left (towards the rear in Figure 10) along the axial direction of the upper support bolt 144, and the guide bolt 147 passes through it on the left side of the upper support bracket 143. The guide bolt 147 is provided parallel to the upper support bracket 143. In a plan view, the guide bolt 147 is provided along a direction perpendicular to the axial direction of the upper support bolt 144, and passes through the locking surface portion 148 that extends to the left from the rear end of the upper support bracket 143, and the head 147a is locked to the rear side of the locking surface portion 148. The guide bolt 147 passes through the locking surface portion 148 by an upper-open recess 148a (see recess 123a in Figure 8) formed in the locking surface portion 148. A positioning nut 149 is screwed onto the rear side of the support arm 146 on the guide bolt 147.

[0096] With the support configuration of the compressor 82 having the above configuration, by loosening the fastening by the lower support bolt 172 of the rotatable support part, the lower support bracket 141 and the compressor 82 supported by the lower support bracket 141 become able to rotate integrally around the lower support bolt 172 as an axis. In this state, by operating the guide bolt 147 in the movable support part, the support arm 146 on the guide bolt 147 moves, and the position of the compressor 82 and the lower support bracket 141 in the rotational direction around the lower support bolt 172 (see Figure 10, arrow A2) is adjusted.

[0097] As the position of the support arm 146 on the guide bolt 147 is adjusted, the upper support bolt 144 moves along the arc shape of the guide hole 143a, and the guide bolt 147 moves up and down along the recess 148a of the locking surface portion 148. The tension of the second belt 99 is adjusted by adjusting the rotational position of the compressor 82. The adjustable angular range for the rotation of the compressor 82 is, for example, about 20 to 30°.

[0098] Next, the relationship between the arrangement of the alternator 81 and the compressor 82 and the counterweight 41 and the bonnet 42 will be explained using Figures 4, 11, and 12.

[0099] As described above, the engine 12 is installed in the engine room 30 located at the rear of the machine. The excavating machine 1 is equipped with a counterweight 41 as a shielding part and a bonnet 42 as a cover part at the rear of the upper rotating body. The counterweight 41 and the bonnet 42 are configured to be symmetrical or nearly symmetrical.

[0100] The counterweight 41 covers the engine room 30 from the rear and has an opening 150 that allows the engine room 30 to face the outside. The counterweight 41 has a shielding body portion 151 that has a roughly trapezoidal outer shape when viewed from the rear of the aircraft, and protruding portions 152 that extend upward from both the left and right ends of the shielding body portion 151 and together with the shielding body portion 151 form the opening 150.

[0101] The counterweight 41 is formed by linearly connecting the right edge of the shielding body 151 and the right edge of the right protruding portion 152R, which is the right protruding portion 152, to each other, thereby forming the right edge portion 154 of the counterweight 41. The right edge portion 154 of the counterweight 41 abuts against the rear edge portion 51b of the right rear cover 51. In addition, the lower end of the right edge portion 154 of the counterweight 41 abuts against the rear edge portion 53b of the right lower cover 53.

[0102] The counterweight 41 is formed by linearly connecting the left edge of the shielding body 151 and the left edge of the left protruding portion 152L, which is the left protruding portion 152, to each other, thereby forming the left edge portion 155 of the counterweight 41. The left edge portion 155 of the counterweight 41 abuts against the rear edge portion 156b of the left rear cover 156, which is an exterior cover provided on the left rear side of the cabin 16. Furthermore, the lower end of the left edge portion 155 of the counterweight 41 abuts against the rear edge portion 157b of the left lower cover 157, which is an exterior cover. The left lower cover 157 is provided so as to be continuous with the lower left side of the cabin 16 and is configured to be approximately symmetrical with the right lower cover 53.

[0103] Furthermore, the counterweight 41 has its lower edge portion 158 formed from the lower edge portion of the shielding body portion 151 that forms its lower part. The counterweight 41 has its lower edge portion 158 horizontal and is aligned with the base plate 40. When viewed from the rear, the right edge portion 154 and the left edge portion 155 of the counterweight 41 are inclined so that the distance between them (distance in the left-right direction) gradually narrows from the bottom to the top, and as a whole, it has an outer shape that follows a roughly trapezoidal shape with the lower edge portion 158 as the base.

[0104] In the counterweight 41, an opening 150 is formed by the shielding body portion 151 and the left and right protruding portions 152. Specifically, the opening 150 is formed by the upper edge of the shielding body portion 151, the left edge of the right protruding portion 152R, and the right edge of the left protruding portion 152L, so as to form a roughly "U" shape when viewed from the rear. The opening 150 connects the engine room 30 to the outside when the bonnet 42 is open.

[0105] The opening 150 opens up most of the upper half of the counterweight 41 in the vertical direction. When viewed from the rear, the top of the engine 12 and the exhaust gas purification device 70 are positioned within the opening range of the opening 150. Of the counterweight 41, the shielding body portion 151 covers the lower part of the engine 12 from the rear, and the left and right protruding portions 152 are located on the left and right sides of the top of the engine 12 when viewed from the rear.

[0106] The bonnet 42 is provided to cover the opening 150 of the counterweight 41 in an openable and closable manner. As shown in Figure 11, the bonnet 42 has an upper surface portion 42a and a rear surface portion 42b which is a covering body portion that covers substantially the entire opening 150. The bonnet 42 is provided to be rotatable in the left-right direction of the aircraft body by a hinge (not shown) provided at the front of the upper surface portion 42a, and by rotating it upward from the closed state, the opening 150 is opened completely (see Figure 1, arrow B1). The bonnet 42 is provided to open to a rotatable position in which at least its lower end is positioned above the upper surface portion 42a of the bonnet 42 in the closed state. In Figure 1, the open state of the bonnet 42 is shown by a dashed line.

[0107] When closed, the bonnet 42 fits into a stepped portion 159 formed around the opening 150 on the counterweight 41, following the outer shape of the bonnet 42, and forms a rear wall portion integrated with the counterweight 41. As shown in Figure 12, the stepped portion 159 has a lower edge portion 159a that forms a roughly V shape when viewed from the rear along the lower edge of the covering body portion 42b of the bonnet 42, and left and right inclined edge portions 159b that form an inclined shape when viewed from the rear along the left and right edges of the covering body portion 42b, following the left edge portion 155 or the right edge portion 154 of the left and right protruding portions 152, respectively. A sealing member made of rubber or the like is interposed between the counterweight 41 and the bonnet 42 and is positioned along the stepped portion 159.

[0108] In the configuration with the counterweight 41 and bonnet 42 as described above, the alternator 81 is positioned so that at least a portion of it overlaps with the opening range of the opening 150 when viewed from the rear of the aircraft. Specifically, as shown in Figure 4, the alternator 81 is located on the lower right side of the opening 150 when viewed from the rear, with most of its upper portion positioned within the opening range of the opening 150. More specifically, the alternator 81 is positioned so that the middle portion of the right half of the upper edge of the shielding body 151 is located below it when viewed from the rear.

[0109] In a rear view, the lower end of the alternator 81 is covered by the shielding body portion 151 of the counterweight 41. In a rear view, the right end of the alternator 81 is covered by the shielding body portion 151 and a shielding plate 160 attached to the counterweight 41, as will be described later.

[0110] Furthermore, the compressor 82 is positioned so that at least a portion of it overlaps the counterweight 41 when viewed from the rear of the machine. In this embodiment, the compressor 82 is located below the alternator 81 and, as shown in Figure 4, is positioned so that its entirety overlaps the counterweight 41 when viewed from the rear. The compressor 82 is located in front of the upper and lower intermediate portion of the right half of the shielding body 151 and is positioned so that its entirety is covered from the rear by the shielding body 151.

[0111] Furthermore, the exhaust gas purification device 70 is installed such that, when viewed from the rear, the entire DPF case 71 is positioned within the opening range of the opening 150. Therefore, when the bonnet 42 is open, the entire DPF case 71, with the mounting plate 71c facing the rear, is exposed through the opening 150.

[0112] The counterweight 41 is provided with a shielding plate 160 that covers a portion of the opening 150. The shielding plate 160 will be explained using Figures 4 and 12 to 14.

[0113] The shielding plate 160 is an example of a protective member that covers a portion of the opening 150 and functions as a fan guard for the fan 63, which is partially exposed from the opening 150. The shielding plate 160 is detachably attached to the counterweight 41. In a configuration in which the fan 63 is located on the right side, which is one side of the engine 12 in the left-right direction, within the engine room 30, the shielding plate 160 is provided so that at least a portion of it overlaps the space 170 (see Figure 6) between the engine 12 and the fan 63 when viewed from the rear of the aircraft.

[0114] The shielding plate 160 is provided on the right-side protruding portion 152R of the left and right protruding portions 152 of the counterweight 41. Inside the engine room 30, the engine 12 is installed approximately in the center in the left-right direction of the aircraft, and the fan 63 is installed to the right of the engine 12. Therefore, the fan 63 is positioned towards the right in the engine room 30. The shielding plate 160 is attached to the right-side protruding portion 152R of the left and right protruding portions 152, on the side where the fan 63 is located in the left-right direction.

[0115] In detail, in a rear view, the fan 63 is positioned with its upper end near the lower right corner of the opening 150, formed by the shielding body 151 and the right-side projection 152R. That is, in a rear view, the fan 63 is positioned such that most of its lower side, excluding its upper end, is hidden by the shielding body 151 of the counterweight 41. Furthermore, the fan 63 is positioned to the right of the engine 12 at a predetermined distance via a pivot support. As a result, a space 170 exists between the engine 12 and the fan 63 (see Figure 6).

[0116] In this configuration of fan 63 relative to engine 12, a shielding plate 160 is provided on the right-side protruding portion 152R located near the fan 63 when viewed from the rear. The shielding plate 160 is provided to cover from the rear the portion of the space 170 between the engine 12 and the fan 63 between the engine 12 and the upper end of the fan 63. In other words, the shielding plate 160 is provided near the lower right corner of the opening 150 formed by the shielding body portion 151 and the right-side protruding portion 152R. In this embodiment, the shielding plate 160 is provided to cover from the rear the portion between the alternator 81 located on the upper right side of the engine 12 and the upper end of the fan 63.

[0117] The shielding plate 160 is a plate-shaped member having a predetermined shape, and has a shielding plate body portion 161 that functions as a covering portion that partially closes the lower right portion of the opening 150, and a fixing surface portion 162 that serves as the fixing portion of the shielding plate 160 to the counterweight 41. The fixing surface portion 162 is formed on the right side of the shielding plate body portion 161. Therefore, the shielding plate 160 has the fixing surface portion 162 fixed to the right-side projection portion 152R, and the shielding plate body portion 161 extends to the left from the right-side projection portion 152R.

[0118] The shielding plate body portion 161 has a straight left edge end portion 161a that runs vertically, and inclined upper edge end portion 161b and lower edge end portion 161c, and these edge ends give it a roughly trapezoidal shape when viewed from the rear, with the left edge end portion 161a side as the base. In other words, the shielding plate body portion 161 has a shape that gradually widens in the vertical direction from the right side to the left side as a covering shape for the opening 150. The fixed surface portion 162 is formed as a projection portion having an outer shape that runs vertically along the middle part of the right side of the shielding plate body portion 161 in the vertical direction.

[0119] The right-side projection 152R is provided with a shielding plate mounting portion 180 for securing the shielding plate 160. The shielding plate mounting portion 180 is located on the inside (left side) of the base portion of the right-side projection 152R. The shielding plate mounting portion 180 is formed at the lower end of the overhang portion 181 formed on the left and right inside (left side) of the right-side projection 152R. The overhang portion 181 is a portion that protrudes inward on both sides of the right-side projection 152R, narrowing the opening 150 at a position further back (front side) than the projection 182, so as to form the inclined edge portion 159b of the stepped portion 159 together with the right-side projection 182 which forms the upper part of the right edge portion 154 of the counterweight 41.

[0120] The protruding portion 181 of the right-side protruding portion 152R, together with the protruding portion 183 of the left-side protruding portion 152L, forms the part of the counterweight 41 that receives the bonnet 42. The left-side protruding portion 183, in the left-side protruding portion 152L, is a part that protrudes inward (to the right) on both sides, narrowing the opening 150 at a position further back (forward) than the protruding portion 184, so as to form the inclined edge portion 159b of the stepped portion 159 together with the right-side protruding portion 184 which forms the upper part of the left edge portion 155 of the counterweight 41. The left-side protruding portion 183 is formed to be wider overall than the right-side protruding portion 181. The left and right protruding portions 181 and 183 are parts that are covered by the bonnet 42 when it is closed.

[0121] As shown in Figures 13 and 14, the shielding plate mounting portion 180 is a rearward projection with a rectangular shape whose longitudinal direction is vertical, and it forms a base portion for mounting the shielding plate 160. The shielding plate mounting portion 180 has a flat support surface 180a that supports the fixed surface portion 162 of the shielding plate 160. The support surface 180a is a vertical plane facing the rear.

[0122] The shielding plate 160 is fixed to the shielding plate mounting portion 180 at two locations, top and bottom, by mounting bolts 185. In the shielding plate mounting portion 180, screw holes 180b for screwing in the mounting bolts 185 are opened at two locations, top and bottom, facing the support surface 180a. The fixing surface portion 162 has holes 162a through which the mounting bolts 185 pass.

[0123] When the shielding plate 160 is attached to the counterweight 41, the fixed surface portion 162 is in surface contact with the support surface 180a of the shielding plate mounting portion 180, and the thickness direction of the fixed surface portion 162 is in the front-to-back direction (up-down direction in Figure 14). When the shielding plate 160 is attached, the shielding plate body portion 161 is inclined in plan view such that the left edge end 161a of the shielding plate body portion 161 is positioned to the left rear side relative to the fixed surface portion 162 (see Figure 14). The shielding plate body portion 161 is inclined to follow the inclination of the shielding body portion 151 of the counterweight 41, which has a curved shape that is convex towards the rear in plan view.

[0124] As shown in Figure 14, the shielding plate 160 has a bent shape in plan view due to the shielding plate body portion 161 and the fixed surface portion 162, forming a straight ridge portion 163 along the vertical direction. In other words, the shielding plate 160 is a bent plate-like member of a certain thickness due to the shielding plate body portion 161 and the fixed surface portion 162. The angle between the shielding plate body portion 161 and the fixed surface portion 162 in plan view is, for example, about 160°.

[0125] On the counterweight 41 side, a recess 186 is formed in the protruding portion 181 of the right-side projection 152R for positioning the shielding plate body portion 161 of the shielding plate 160. In a rear view, the recess 186 is formed in such a way that the lower part of the protruding portion 181 is cut out, and has a roughly trapezoidal concave shape that follows the outer shape of the shielding plate body portion 161. In a rear view, the recess 186 is formed so that it is completely closed by the shielding plate body portion 161, with gaps between it and the upper edge end 161b and the lower edge end 161c of the shielding plate body portion 161 of the shielding plate 160.

[0126] The recess 186 is located at the lower right corner of the opening 150 and forms a concave opening within the opening 150 that is closed by the shielding plate 160. In other words, when the bonnet 42 is opened and the opening 150 is open, the recess 186 becomes an opening that connects the engine room 30 to the outside when the shielding plate 160 is removed. Therefore, when viewed from the rear, the recess 186 is formed so that its opening range overlaps with the portion of the space 170 between the engine 12 and the fan 63 between the engine 12 and the upper end of the fan 63.

[0127] The recess 186 provides a workspace for maintenance when the shielding plate 160 is removed. In other words, when the recess 186 is opened, it provides space to access the maintenance target inside the engine room 30. Maintenance performed through the recess 186 includes, for example, adjusting the tension of the first belt 95 by rotating the alternator 81 as described above.

[0128] According to the excavation machine 1 of this embodiment described above, in a configuration equipped with an exhaust gas purification device 70, good maintainability can be obtained for equipment such as the alternator 81 arranged around the engine 12, and equipment can be efficiently arranged within the engine room 30.

[0129] In terms of the equipment layout within the engine compartment 30, the alternator 81 is positioned at the rear of the engine 12 and below the exhaust gas purification device 70. With this configuration, compared to, for example, a configuration where the alternator 81 is positioned at the front of the engine 12, the alternator 81 is positioned in a location that is easily accessible from the rear of the machine, thus providing good maintainability for the alternator 81. In particular, since the rear of the engine compartment 30 is opened by opening the bonnet 42, the alternator 81, which is positioned at the rear of the engine 12, can be easily accessed and maintained.

[0130] Furthermore, since the exhaust gas purification device 70, which is relatively bulky and heavy, is positioned above the engine 12 on the opposite side from where the hydraulic pump 35 is located, a well-balanced and efficient equipment layout can be achieved within the engine room 30.

[0131] Furthermore, in the equipment layout within the engine room 30, the relatively bulky engine 12 and exhaust gas purification device 70 are separated by a relatively small hydraulic pump 35, which is installed in the space on one side (left side). The driver's unit 10 in the cabin 16 is located above and in front of the space where the hydraulic pump 35 is installed. With this configuration, the driver's unit 10 is less likely to be compressed by the space required in the engine room 30, making it easier to secure space for the driver's unit 10 and thus enabling a comfortable operating space. In particular, in relatively small excavators such as the excavating machine 1, the space in the engine room 30 is limited, so the equipment layout within the engine room 30 according to this embodiment effectively suppresses the compression of space for the driver's unit 10 and makes it easier to balance the weight on the left and right sides of the machine.

[0132] Furthermore, in terms of the equipment layout within the engine room 30, the compressor 82 is positioned below the alternator 81. With this configuration, compared to, for example, a configuration where the compressor 82 is positioned in front of the engine 12, the compressor 82 is positioned in a location that is easily accessible from the rear of the machine, thus providing good maintainability for the compressor 82. In particular, since the rear of the engine room 30 is opened by opening the bonnet 42, the compressor 82, which is located at the rear of the engine 12, can be easily accessed and maintained.

[0133] Furthermore, by positioning the compressor 82 below the alternator 81, these devices are located close to each other, which improves the efficiency of maintenance work on both devices.

[0134] Furthermore, the compressor 82 is positioned so that at least a portion of it is located behind the alternator 81. This configuration allows the compressor 82 to be placed in a more accessible location, resulting in better maintainability.

[0135] Furthermore, the rear wall of the engine compartment 30 is configured with a counterweight 41 having an opening 150 and a bonnet 42 that opens and closes the opening 150. The alternator 81 is positioned so that a portion of it is exposed through the opening 150, and the compressor 82 is positioned so that its entirety is covered by the counterweight 41. With this configuration, the alternator 81 and compressor 82 can be placed in easily accessible locations, and good maintainability for these components can be obtained.

[0136] Furthermore, the cylindrical DPF case 71 positioned above the engine 12 is oriented so that its central axis is in the front-to-back direction or approximately in the front-to-back direction. With this configuration, compared to, for example, a configuration in which the DPF case 71 is installed vertically (with its central axis oriented vertically) or a configuration in which it is placed on the front side of the engine 12, the DPF case 71 is positioned in a location that is easily accessible from the rear of the aircraft, thus providing good maintainability for the DPF case 71.

[0137] In particular, with a configuration in which the DPF case 71 is installed with the mounting plate 71c facing the rear, the filter of the DPF case 71 can be easily replaced from the opening 150 by opening the bonnet 42. Furthermore, with a configuration in which the mounting plate 71c of the DPF case 71, the alternator 81, and the compressor 82 are arranged vertically in a rear view, these components can be centrally located, improving the efficiency of maintenance work.

[0138] Furthermore, by arranging the DPF case 71 above the engine 12 along the longitudinal direction, the space within the engine compartment 30 can be effectively utilized, and the pressure on the driver's unit 10 due to the space required in the engine compartment 30 can be effectively reduced. As a result, it becomes easier to secure space for the driver's unit 10, and the comfort of the driver's unit 10 can be improved.

[0139] Furthermore, the alternator 81 is rotatably supported for adjusting the tension of the first belt 95. With this configuration, the alternator 81, which is positioned in a location easily accessible from the rear of the machine, can be easily accessed for maintenance work, such as adjusting the tension of the first belt 95, thereby achieving good maintainability.

[0140] Furthermore, a shielding plate 160 is provided on the counterweight 41, positioned to block the space between the engine 12 and the fan 63 from the rear. With this configuration, when performing maintenance on the devices and equipment installed in the engine room 30, the access route to the fan 63 can be blocked, thereby preventing entanglement with the fan 63 and ensuring safety.

[0141] Furthermore, the shielding plate 160 is attached to the right-side protruding portion 152R of the counterweight 41. With this configuration, the shielding plate 160 can be provided with a simple structure without the need to provide a separate support member for the shielding plate 160.

[0142] Furthermore, the shielding plate 160 is provided to cover a recess 186 formed in the overhang 181 provided on the right-side protruding portion 152R. With this configuration, by removing the shielding plate 160, access to the fan 63 and the equipment located near it can be ensured by the recess 186, while minimizing the opening range on the side of the opening 150 where the fan 63 is located (right side). This makes it easier to balance the weight of the entire aircraft, which is relatively greatly affected by the shape of the counterweight 41, etc. In addition, by narrowing the opening range of the opening 150, noise such as the operating noise of the engine 12 in the engine room 30 can be reduced.

[0143] As described above using embodiments, the work machine according to the present invention is not limited to the embodiments described above, and various forms can be adopted within the scope consistent with the spirit of the present invention.

[0144] This technology can take the following configurations. Note that the configurations described below can be selected and combined as desired.

[0145] (1) An engine with the output shaft protruding from one side of the aircraft, A hydraulic pump located on the other side of the engine in the left-right direction, An exhaust treatment device positioned above the engine and for processing exhaust gas discharged from the engine, The system includes an alternator driven by the rotational power of the output shaft, The alternator is positioned at the rear of the engine and below the exhaust treatment device. A type of machinery used for industrial work. (2) The system includes a compressor driven by the rotational power of the output shaft, The compressor is located below the alternator. The work machine described in (1) above. (3) The compressor is positioned, at least in part, behind the alternator. The work machine described in (2) above. (4) The aforementioned engine is installed in the engine room located at the rear of the aircraft. A shielding section that covers the engine room from the rear and has an opening that allows the engine room to face the outside, The facility comprises a cover body that can open and close to cover the aforementioned opening, The alternator is positioned such that, when viewed from the rear of the aircraft, at least a portion of it overlaps with the opening range of the opening. The compressor is positioned such that, when viewed from the rear of the aircraft, at least a portion of it overlaps with the shielding portion. The work machine described in (2) or (3) above. (5) The exhaust treatment device has a cylindrical filter case that receives the exhaust gas discharged from the engine, The filter case is installed with its longitudinal direction aligned with the front-to-back direction of the aircraft. A work machine as described in any one of (1) to (4) above. (6) The alternator is provided such that one end is rotatably supported relative to the engine, and the other end is fixedly supported by a support bracket extending toward the rear of the machine from a support member supporting the exhaust treatment device relative to the engine, in a manner that allows the alternator to rotate. The work machine described in (5) above. (7) A fan is positioned on one side of the engine in the left-right direction, A protective member is provided detachably to the shielding portion and closes a part of the opening, The protective member is provided such that, in a rear view of the aircraft, at least a portion of it overlaps the space between the engine and the fan. The work machine described in (4) above. (8) The shielding portion comprises a shielding main body portion that forms its lower part, and protruding portions that extend upward from both the left and right ends of the shielding main body portion and together with the shielding main body portion form the opening. The protective member is provided on one of the left and right protruding portions. The work machine described in (7) above. [Explanation of symbols]

[0146] 1. Excavation equipment (working machinery) 12 Engines 30 Engine Room 35 Hydraulic pump 41 Counterweight (shielding part) 42. Hood (cover) 63 Fans 65 Output shaft 70 Exhaust gas purification device (exhaust treatment device) 71 DPF case (filter case) 76 Rear support stay (support member) 81 Alternator 82 Compressor 100 Upper support bracket (support bracket) 150 opening 151 Shielding main body 152 Protruding section 160 Shielding plate (protective component) 170 Space 181 Overhang 186 recess

Claims

1. An engine with the output shaft protruding from one side of the aircraft, A hydraulic pump located on the other side of the engine in the left-right direction, An exhaust treatment device positioned above the engine and for processing exhaust gas discharged from the engine, An alternator driven by the rotational power of the output shaft, The system includes a compressor driven by the rotational power of the output shaft, The alternator is located at the rear of the engine and below the exhaust treatment device. The compressor is located below the alternator. Agricultural machinery.

2. The compressor is positioned, at least in part, behind the alternator. The work machine according to claim 1.

3. The aforementioned engine is installed in the engine room located at the rear of the aircraft. A shielding section that covers the engine room from the rear and has an opening that allows the engine room to face the outside, The facility comprises a cover body that can open and close to cover the aforementioned opening, The alternator is positioned such that, when viewed from the rear of the aircraft, at least a portion of it overlaps with the opening range of the opening. The compressor is positioned such that, when viewed from the rear of the aircraft, at least a portion of it overlaps with the shielding portion. A working machine according to claim 1 or claim 2.

4. The exhaust treatment device has a cylindrical filter case that receives the exhaust gas discharged from the engine, The filter case is installed with its longitudinal direction aligned with the front-to-back direction of the aircraft. The work machine according to claim 1.

5. An engine with the output shaft protruding from one side of the aircraft, A hydraulic pump located on the other side of the engine in the left-right direction, An exhaust treatment device positioned above the engine and for processing exhaust gas discharged from the engine, The system includes an alternator driven by the rotational power of the output shaft, The alternator is located at the rear of the engine and below the exhaust treatment device. The exhaust treatment device has a cylindrical filter case that receives the exhaust gas discharged from the engine, The aforementioned filter case is installed with its longitudinal direction aligned with the front-to-back direction of the aircraft. The alternator is provided such that one end is rotatably supported relative to the engine, and the other end is fixedly supported by a support bracket extending toward the rear of the machine from a support member supporting the exhaust treatment device relative to the engine, in a manner that allows the alternator to rotate. Agricultural machinery.

6. A fan is positioned on one side of the engine in the left-right direction, A protective member is provided detachably to the shielding portion and closes a part of the opening, The protective member is provided such that, in a rear view of the aircraft, at least a portion of it overlaps the space between the engine and the fan. The work machine according to claim 3.

7. The shielding portion comprises a shielding main body portion that forms its lower part, and protruding portions that extend upward from both the left and right ends of the shielding main body portion and together with the shielding main body portion form the opening. The protective member is provided on one of the left and right protruding portions. The work machine according to claim 6.

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