JP2020056152A - Construction machine - Google Patents

Abstract

To enable engine oil to be quickly fed to every sliding part when starting an engine, even when an oil filter is moved to an exchangeable position.SOLUTION: A feeding side oil reservoir section 30 reserving an engine oil 18 with an engine 14 stopped is provided in a feeding pipe 26 between a flow-out port 15B of an engine block 15 forming the engine 14 and an oil filter 25. A return side oil reservoir section 31 reserving the engine oil 18 with the engine 14 stopped is provided in a return pipe 28 between the oil filter 25 and a flow-in port 15C of the engine block 15.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a construction machine such as a hydraulic shovel, for example, and more particularly to a construction machine having an engine that drives a hydraulic pump.

  Generally, a hydraulic shovel is known as a typical example of a construction machine. The body of the hydraulic shovel is composed of a lower traveling body capable of self-propelling and an upper revolving body pivotally mounted on the lower traveling body. A front device is provided on the front side of the upper revolving unit so as to be able to move up and down, and digging work of earth and sand is performed using the front device.

  The upper revolving superstructure of the hydraulic excavator includes a revolving frame having a front device mounted on the front side, a counterweight provided on the rear side of the revolving frame to balance the weight with the front device, and a revolving frame positioned in front of the counterweight. And an engine for driving a hydraulic pump.

  The engine includes an engine block forming an outer shell, a crankshaft, a piston, a connecting rod, a camshaft, a rocker arm provided inside the engine block, and a turbocharger provided outside the engine block. It is composed of The engine also has an engine oil for supplying engine oil to lubricate and cool sliding parts (rotating parts) such as a crankshaft, a piston, a connecting rod, a camshaft, a rocker arm, and a turbocharger. A supply device is provided.

  The engine oil supply device has a suction pipe that sucks up engine oil stored in an oil pan that forms the bottom of the engine block, and an oil gallery that distributes and supplies engine oil to each sliding portion. The suction pipe is provided with a strainer, an oil supply pump, and the like.

  An outlet communicating with the suction pipe and an inlet communicating with the oil gallery are provided on a side surface of the engine block. Further, an oil filter bracket is attached to a side surface of the engine block at a position corresponding to the outlet and the inlet. An oil filter for removing foreign substances contained in engine oil is detachably (replaceably) attached to the oil filter bracket.

  On the other hand, there is a small-sized hydraulic excavator called a mini-excavator, and the small-sized hydraulic excavator has a small upper revolving structure so that it can perform a turning operation with a small radius. For this reason, the installation space on the revolving frame is limited, and a counterweight, an engine, a hydraulic pump, a heat exchanger, various tanks, a control valve, and the like are arranged close to each other on the revolving frame.

  Here, the position of the oil filter bracket is determined in advance for each type (model) of the engine. For this reason, when the engine is mounted on the upper-part turning body, the position of the oil filter bracket may be located at a position where the oil filter cannot be attached or detached. In this case, it is necessary to move the oil filter bracket to a position where the oil filter can be attached and detached. As a configuration for moving the oil filter bracket (oil filter), a supply hose connecting the outflow port of the engine and the oil filter bracket, and a return hose connecting the oil filter bracket and the inflow port of the engine are provided. There is known a configuration in which an oil filter is disposed, for example, in the vicinity of a side door of an exterior cover by each hose (for example, see Patent Document 1).

No. 6-30405

  By the way, when the oil filter is moved to a replaceable position, a path (flow path) for supplying the engine oil in the oil pan to each sliding portion of the engine becomes long. Therefore, there is a possibility that it takes a long time from the start of the engine to the supply of oil to each sliding portion by the length of the supply path of the engine oil. As described above, when the refueling is delayed, there is a problem that the durability of the refueling target portion is reduced.

  The present invention has been made in view of the above-described problems of the related art, and an object of the present invention is to quickly apply engine oil to each sliding portion when the engine is started, even when the oil filter is moved to a replaceable position. An object of the present invention is to provide a construction machine which can be supplied.

  The present invention provides an engine having a self-propelled vehicle body, an outflow port provided in the vehicle body, through which engine oil flows out, and an inflow port through which engine oil flows, and removing foreign matter contained in the engine oil of the engine. And a return line connecting the oil filter and the inflow port, the supply line connecting the outflow port and the oil filter of the engine. An oil reservoir for storing engine oil when the engine is stopped is provided in at least one of the path and the return pipe.

  According to the present invention, even when the oil filter is moved to a replaceable position, the engine oil can be promptly supplied to each sliding portion when the engine is started.

It is a front view showing the hydraulic shovel applied to a 1st embodiment of the present invention. It is the top view which looked at the hydraulic shovel from the upper part in the state which omitted a part of a front device and an exterior cover. It is the perspective view which looked at the hydraulic shovel in the state where the right side cover of the exterior cover was opened from the slanting rear side. It is the perspective view which looked at the turning frame in which the engine by a 1st embodiment was mounted from the diagonally front side. FIG. 5 is a partially broken front view of the engine in FIG. 4 as viewed from the front side. FIG. 2 is a schematic diagram illustrating a supply path of engine oil according to the first embodiment. It is the perspective view which looked at the hydraulic shovel applied to the 2nd embodiment of the present invention from the diagonal back side, with the engine cover of the exterior cover opened. FIG. 10 is a perspective view of a partly broken view of a revolving frame on which an engine according to a second embodiment is mounted and a counterweight viewed obliquely from the rear side. It is the perspective view which looked at the turning frame in which the engine by a 2nd embodiment was mounted, and the counterweight from a slanting front side. It is the perspective view which looked at the engine in FIG. 9 from diagonally rear side. It is the perspective view which looked at the engine by a 3rd embodiment from the slanting rear side. It is a perspective view which expands and shows the engine filter bracket and engine filter in FIG. It is a schematic diagram showing a supply path of engine oil according to a third embodiment.

  Hereinafter, as a representative example of a construction machine according to an embodiment of the present invention, a rear-small turning hydraulic excavator will be described as an example, and will be described in detail with reference to the accompanying drawings.

  First, FIGS. 1 to 6 show a first embodiment of the present invention. In FIG. 1, a hydraulic excavator 1 is a crawler-type lower traveling body 2 capable of self-propelling in a forward and rearward direction, and is mounted on the lower traveling body 2 so as to be capable of turning via a turning device 3. The vehicle includes an upper revolving structure 4 that constitutes a vehicle body, and a front device 5 that is provided in front of the upper revolving structure 4 in front of and in the rearward direction so as to be capable of elevating and excavates earth and sand. The turning device 3 includes a turning wheel 3 </ b> A provided between the lower traveling body 2 and the upper turning body 4, and a later-described turning motor 10 that drives the upper turning body 4 to turn.

  Here, as shown in FIG. 2, the hydraulic excavator 1 of the present embodiment has a turning radius R when a distance dimension from a turning center O of the upper turning body 4 to an outer peripheral surface 7A of a counterweight 7 described below is obtained. The rear part of the upper revolving unit 4 (the outer peripheral surface 7A of the counterweight 7) can turn within a virtual circle C drawn by the turning radius R. The diameter of the imaginary circle C drawn by the rear part of the upper revolving unit 4 is within a range that does not greatly protrude from the vehicle width W of the lower traveling unit 2 when the upper revolving unit 4 turns, for example, 120 of the vehicle width W. % Is set within the range.

  The revolving frame 6 forms a support structure for the upper revolving unit 4. As shown in FIGS. 2 and 4, the revolving frame 6 includes a bottom plate 6A made of a thick steel plate extending in the front and rear directions, and is erected on the bottom plate 6A. A left vertical plate 6B and a right vertical plate 6C extending rearward, and a left side frame 6D and a right side frame which are arranged at intervals outside the left and right directions of the vertical plates 6B and 6C, and extend forward and rearward. 6E, a bottom plate 6A, and a plurality of overhanging beams 6F projecting from the vertical plates 6B, 6C in the left and right directions, and supporting the left and right side frames 6D, 6E at the ends thereof. .

  The counterweight 7 is mounted on the rear side of the turning frame 6. The counterweight 7 is formed as a heavy object in order to balance the weight with the front device 5. The counterweight 7 is formed such that the turning radius of the upper swing body 4 becomes smaller when the upper swing body 4 swings. More specifically, the counterweight 7 has an arc-shaped outer peripheral surface 7A by bending both sides in the left and right directions toward the front side. With this shape, the counterweight 7 is disposed closer to the front side near the turning center of the turning frame 6. Have been. Accordingly, the counterweight 7 is disposed at a position where the left end is close to the rear surface of the cab 12 described later, and the right end is disposed at a position close to the rear part of the fuel tank 9 described below.

  As shown in FIGS. 2 and 3, the arc-shaped counterweight 7 has a center weight 7B located at the center in the left and right directions, and a left side of the center weight 7B and lower than the center weight 7B. A left side weight portion 7C formed with a height dimension, for example, the same height dimension as the left side frame 6D of the revolving frame 6, and a height equivalent to the left side weight portion 7C located on the right side of the center weight portion 7B. And a right weight portion 7D formed with the same dimension.

  The center weight portion 7B protrudes rearward, and the left and right side weight portions 7C and 7D extend forward from the center weight portion 7B in the left and right directions. Thus, a space is provided on the left side of the counterweight 7 for disposing the left side cover 13A of the exterior cover 13 due to a step between the center weight portion 7B and the left side weight portion 7C. On the other hand, on the right side of the counterweight 7, a space for disposing the right side cover 13B is formed by a step between the central weight portion 7B and the right weight portion 7D.

  Here, in the rear-extra-small swing hydraulic excavator 1 according to the present embodiment, the distance dimension from the swing center O of the upper swing body 4 to the outer peripheral surface 7A of the counterweight 7 is defined as the swing radius R as described above. In this case, the locus drawn by the outer peripheral surface 7A of the counterweight 7 during the turning operation is indicated by a virtual circle C. Since the space required for turning can be reduced by reducing the virtual circle C, work can be performed efficiently even in a small site. For this reason, the hydraulic excavator 1 arranges the counterweight 7 close to the turning center O, so that the diameter of the virtual circle C can be 120% of the vehicle width W of the lower traveling body 2 at the maximum. it can. Accordingly, the installation space for installing various devices in the hydraulic excavator 1 is reduced, so that the counterweight 7, the swing motor 10, the hydraulic oil tank 8, the various pipes, and the hoses come close to the engine 14 to be described later. It is arranged.

  The hydraulic oil tank 8 is disposed on the right side of the front device 5 and at an intermediate position in front of and behind the turning frame 6. Thereby, the hydraulic oil tank 8 is arranged close to the front side of the hydraulic pump 33 described later. The hydraulic oil tank 8 stores hydraulic oil therein, and is formed as a rectangular parallelepiped tank that is elongated upward and downward.

  The fuel tank 9 stores fuel to be supplied to the engine 14, and is disposed on the turning frame 6 so as to be arranged on the right side of the hydraulic oil tank 8. Specifically, the fuel tank 9 is disposed immediately before the right weight portion 7D of the counterweight 7, and is a partition on the front side of a maintenance opening 13D formed when the right side cover 13B of the outer cover 13 described later is opened. Has made.

  The turning motor 10 is provided between the left and right vertical plates 6B and 6C of the turning frame 6 and protrudes upward from the bottom plate 6A. The turning motor 10 constitutes a drive source of the turning device 3 and is formed as a hydraulic motor.

  The control valve group 11 is provided at the right front part of the turning frame 6. The control valve group 11 is configured by connecting a plurality of control valves. In the control valve group 11, some of the control valves are connected to the hydraulic actuator of the front device 5, the swing motor 10, the hydraulic pump 33, and the like via a hydraulic hose (not shown).

  The cab 12 is provided at the left front part of the turning frame 6. That is, the cab 12 is arranged on the left front side in the left and right directions with the foot portion of the front device 5 interposed therebetween. The cab 12 forms a living space in which the operator rides, and forms a long box body in the upward and downward directions.

  As shown in FIGS. 1 to 3, the exterior cover 13 is disposed between the counterweight 7 and the cab 12, and covers the engine 14, the hydraulic pump 33, the heat exchange device 34, and the like. The exterior cover 13 includes a left side cover 13A, a right side cover 13B, and an engine cover 13C.

  The left side cover 13A covers the left side of the heat exchange device 34 so as to be openable and closable, and is arranged using a space formed by a step between the central weight portion 7B of the counterweight 7 and the left weight portion 7C. The left side cover 13A is formed to extend upward and downward while being curved along the arc shape of the counterweight 7. The left side cover 13A is rotatably supported at a front portion on the cab 12 side, for example, and can be opened and closed at a rear side. Thus, the left side cover 13A can perform maintenance of the heat exchange device 34 and the like when the rear side is opened.

  As shown in FIGS. 2 and 3, the right side cover 13B covers the right side of the hydraulic pump 33 and the oil filter 25. The right side cover 13B is disposed using a space formed by a step between the central weight portion 7B of the counterweight 7 and the right weight portion 7D. Like the left side cover 13A, the right side cover 13B is formed to be curved along the arc shape of the counterweight 7. Here, as shown in FIG. 3, the right side cover 13B can open the rear side with the front end as a fulcrum. When the right side cover 13B is opened, a maintenance opening 13D surrounded by the counterweight 7, the fuel tank 9, the engine cover 13C, and the like is formed. Through the maintenance opening 13D, maintenance of the hydraulic pump 33, replacement of the oil filter 25, and the like can be performed from outside the vehicle body.

  The engine cover 13C covers the upper side of the engine 14, the exhaust gas post-processing device 32, and the like. The engine cover 13C includes a rear surface portion 13C1 which is located on the central weight portion 7B of the counterweight 7 and extends in an arc shape, and an upper surface portion 13C2 which extends forward from an upper edge of the rear surface portion 13C1. The front end of the upper surface portion 13C2 is attached to a structure (not shown) provided on the revolving frame 6 so as to be able to rotate upward and downward. Thus, the engine cover 13C can lift the rear side with the front side as a fulcrum, and can perform maintenance of the engine 14 and the like in this open state.

  Next, the configuration of the engine 14 having the features of the present embodiment will be described in detail.

  As shown in FIG. 4, the engine 14 constitutes a prime mover, and is provided at a rear position of the turning frame 6 on the front side of the counterweight 7 so as to extend horizontally to the left and right with respect to the turning frame 6. Have been. On the left side of the engine 14, a cooling fan 14A for supplying cooling air to a heat exchange device 34 described later is provided. On the other hand, a hydraulic pump 33 described later is mounted on the right side of the engine 14.

  As shown in FIG. 5, the engine 14 includes an engine block 15 including a crankcase, a cylinder block, and the like, an oil pan 16 provided so as to close a lower portion of the engine block 15, and an engine 14 provided inside the engine block 15. The engine includes a crankshaft, a piston, a connecting rod, a camshaft, a rocker arm, etc. (all not shown), and a turbocharger 17 provided outside the engine block 15.

  As shown in FIG. 6, in the engine block 15, an outlet 15B and an inlet 15C are provided close to each other at a front part 15A located on the front side of the upper-part turning body 4. The outlet 15B is connected to a suction pipe 20A of the upstream line 20, which will be described later, and a supply pipe 26. On the other hand, a return pipe 28 described later and an oil cooler 21A of the downstream line 21 are connected to the inflow port 15C. A predetermined amount of lubricating and cooling engine oil 18 is stored in the oil pan 16. Further, the engine 14 has an engine oil supply device for supplying engine oil 18 to sliding parts (rotating parts) such as a crankshaft, a piston, a connecting rod, a camshaft, a rocker arm, and a turbocharger 17. 19 are provided.

  The engine oil supply device 19 slides the engine oil 18 in the oil pan 16, which sucks up the engine oil 18 and supplies it to an oil filter 25, which will be described later, and the engine oil 18 from which small foreign matter has been removed by the oil filter 25. It is configured to include a downstream line 21 described below that is distributed to the portions 21D to 21G, and a filter moving line 22 for moving the position of the oil filter 25.

  The upstream line 20 includes a suction pipe 20A provided between the bottom of the oil pan 16 and the outlet 15B of the engine block 15, a strainer 20B provided at an upstream end of the suction pipe 20A, and a suction pipe 20A. And a pressure valve (relief valve) 20D provided on the suction pipe 20A located downstream of the oil supply pump 20C.

  The downstream end of the suction pipe 20A communicates with the supply oil passage 23A of the engine-side oil filter bracket 23 through the outlet 15B of the engine block 15. The strainer 20 </ b> B removes relatively large foreign matters mixed in the engine oil 18 in the oil pan 16. The oil supply pump 20C pumps up engine oil 18 from the oil pan 16 and supplies it to sliding parts 21D to 21G such as a crankshaft, a piston, a connecting rod, a camshaft, a rocker arm, and a turbocharger 17. . The pressure valve 20D constitutes a relief valve for keeping the pressure in the suction pipe 20A constant.

  The downstream line 21 is provided so as to be connected to an oil cooler 21A connected to an inlet 15C of the engine block 15, an oil gallery 21B formed in the engine block 15 while being connected to the oil cooler 21A, and an oil gallery 21B. Pressure sensor 21C. The oil cooler 21A cools the engine oil 18.

  Most of the oil gallery 21 </ b> B is formed as an oil passage branched to the engine block 15. The tip side (downstream side) of each oil passage is a sliding portion of a crankshaft, a piston, a connecting rod, a camshaft, a rocker arm, etc., arranged in the engine block 15. The tip of each oil passage is formed toward the internal sliding portions 21D, 21E, 21F. On the other hand, a part of the oil gallery 21B is arranged to extend to the outside of the engine block 15 and is formed toward an external sliding portion 21G serving as a sliding portion of the turbocharger 17.

  Here, the position of the engine block 15 where the oil filter 25 described later is mounted is predetermined by the engine 14. For this reason, when the engine 14 is mounted on the upper revolving superstructure 4 (the revolving frame 6), the oil filter 25 may be difficult to attach and detach because the oil filter 25 is disposed in front of the engine block 15. In this case, the oil filter 25 is moved to a position where the oil filter 25 can be detached from the outside by using a filter moving line 22 described later.

  Next, the filter moving line 22 which is a characteristic part of the present embodiment will be described with reference to FIGS.

  The filter moving line 22 is a position where an oil filter 25 described below can be replaced from outside the vehicle body, specifically, a position where the oil filter 25 can be replaced from outside through a maintenance opening 13D formed when the right side cover 13B of the outer cover 13 is opened. It is to be arranged in. The filter moving line 22 includes an engine-side oil filter bracket 23, a filter-side oil filter bracket 24, a supply pipe 26, and a return pipe 28.

  The engine-side oil filter bracket 23 is attached to the front surface portion 15A of the engine block 15 so as to face the outlet 15B and the inlet 15C. The engine-side oil filter bracket 23 has a supply oil passage 23A communicating with the outlet 15B and a return oil passage 23B communicating with the inlet 15C. When the engine-side oil filter bracket 23 is located at a position accessible from the outside, the oil filter 25 can be directly attached. On the other hand, when the oil filter 25 is moved to another place, the plug 23C for closing is mounted on the engine-side oil filter bracket 23 at the position where the oil filter 25 was mounted.

  The filter-side oil filter bracket 24 is for attaching the oil filter 25 and is connected to the oil filter 25. In the filter-side oil filter bracket 24, a supply oil passage 24A that receives supply of the engine oil 18 and a return oil passage 24B that returns the engine oil 18 to the engine 14 side are formed. An oil filter 25 is detachably attached to the filter-side oil filter bracket 24 so as to be connected to the supply oil passage 24A and the return oil passage 24B.

  Here, the filter-side oil filter bracket 24 is arranged at a position where the oil filter 25 can be replaced from the outside, specifically, at a position where the oil filter 25 faces the maintenance opening 13D of the outer cover 13. The filter-side oil filter bracket 24 is attached to a later-described firewall 35 via an attachment plate 24C. In this case, as shown in FIG. 5, the filter-side oil filter bracket 24 is disposed at a position higher than the engine-side oil filter bracket 23 and oil reservoirs 30, 31 described later.

  The oil filter 25 is provided on the filter-side oil filter bracket 24. The oil filter 25 removes small foreign matters contained in the engine oil 18 of the engine 14. The oil filter 25 can be removably attached to the filter-side oil filter bracket 24 by, for example, rotating in a horizontal direction using a dedicated tool.

  The supply pipe 26 connects the outlet 15 </ b> B of the engine block 15 of the engine 14 and the oil filter 25. The supply pipe 26 includes a supply oil path 23A of the engine-side oil filter bracket 23, a supply oil path 24A of the filter-side oil filter bracket 24, and a supply hose 27 described later.

  The supply hose 27 connects the outlet 15 </ b> B of the engine block 15 and the filter-side oil filter bracket 24, and forms a part of the supply pipe 26. Specifically, the supply hose 27 is made of a flexible resin hose, and the upstream end in the flow direction when supplying the engine oil 18 is connected to the supply oil passage 23A of the engine-side oil filter bracket 23. I have. On the other hand, the downstream end of the supply hose 27 is connected to a supply oil passage 24 </ b> A of the filter-side oil filter bracket 24. A supply-side oil reservoir 30, which will be described later, is provided at an intermediate position in the length direction of the supply hose 27.

  The return pipe 28 connects the oil filter 25 and the inlet 15 </ b> C of the engine block 15. The return pipe 28 includes a return oil path 23B of the engine-side oil filter bracket 23, a return oil path 24B of the filter-side oil filter bracket 24, and a return hose 29 described later.

  The return hose 29 connects the filter-side oil filter bracket 24 and the inflow port 15C of the engine block 15 and forms a part of the return line 28. More specifically, the return hose 29 is made of a flexible resin hose, like the supply hose 27, and has an upstream end connected to the return oil passage 24B of the filter-side oil filter bracket 24. On the other hand, the downstream end of the return hose 29 is connected to the return oil passage 23B of the engine-side oil filter bracket 23. A return-side oil reservoir 31 described later is provided at an intermediate position in the length direction of the return hose 29.

  The supply-side oil reservoir 30 is provided between the outlet 15 </ b> B of the engine block 15 of the engine 14 and the oil filter 25. The supply-side oil reservoir 30 stores the engine oil 18 when the engine 14 is stopped. The supply-side oil reservoir 30 is formed as a U-shaped pipe by bending a part of the supply hose 27 in the length direction in a U-shape toward the lower side. In this case, the supply-side oil reservoir portion 30 is formed in a U-shape by applying an external force to an intermediate portion of the supply hose 27 made of a flexible resin hose to elastically deform or plastically deform. be able to. Further, the supply-side oil reservoir 30 may be formed as a U-shaped metal tube, and a supply hose divided into two may be connected to both ends.

  Here, when the engine 14 is driven, the engine oil 18 is supplied to the sliding parts 21D to 21G through the upstream line 20, the supply pipe 26, the return pipe 28, and the downstream line 21. On the other hand, when the engine 14 is stopped, the engine oil 18 in the supply pipe 26 is returned to the oil pan 16 by gravity. At this time, the supply-side oil reservoir 30 stores a part of the engine oil 18 returned to the oil pan 16 side in the supply pipe 26 as the reservoir oil 18A in the range of the height H shown in FIG. be able to. The accumulated oil 18A stored in the supply-side oil reservoir 30 is pressed by the engine oil 18 from the oil pan 16 via the air in the supply pipe 26 when the engine 14 is started next time. Are supplied to the sliding portions 21D to 21G earlier than the engine oil 18 from the oil pan 16.

  As shown in FIG. 6, the return-side oil reservoir 31 is provided between the oil filter 25 and the inlet 15 </ b> C of the engine block 15 of the engine 14. The return-side oil reservoir 31, like the supply-side oil reservoir 30, stores the engine oil 18 with the engine 14 stopped. The return-side oil reservoir 31 is formed as a U-shaped pipe by bending a part of the length of the return hose 29 in the length direction downward into a U-shape. The structure of the return-side oil sump 31 is the same as that of the supply-side oil sump 30 and will not be described.

  When the engine 14 stops and the engine oil 18 in the return line 28 moves toward the engine 14 due to gravity, the return-side oil reservoir 31 moves the engine oil 18 moving in the return line 28 toward the engine 14. Can be stored as oil 18A. The pool oil 18A stored in the return-side oil pool 31 is supplied from the oil pan 16 the next time the engine 14 is started, similarly to the pool oil 18A stored in the supply-side oil pool 30 described above. By being pressed by the engine oil 18 via air, the oil is supplied to the sliding portions 21D to 21G earlier than the engine oil 18 from the oil pan 16.

  The exhaust gas post-processing device 32 is provided on the right side of the engine 14 and extends forward and backward. The exhaust gas post-processing device 32 purifies exhaust gas discharged from the engine 14 and is connected to the exhaust side of the engine 14. In the exhaust gas post-processing device 32, for example, an oxidation catalyst, a particulate matter collection filter, a urea water reduction catalyst, and the like (all not shown) are provided.

  The hydraulic pump 33 is provided on the right side of the engine 14. The hydraulic pump 33 supplies pressure oil for driving various hydraulic actuators by being driven by the engine 14.

  The heat exchange device 34 is provided on the revolving frame 6 on the left side of the engine 14. The heat exchange device 34 has a radiator, an oil cooler, and the like at a position facing the cooling fan 14A of the engine 14.

  As shown in FIG. 4, the firewall 35 is provided upright on the revolving frame 6 as a partition plate so as to cover the right side of the exhaust gas post-processing device 32. The firewall 35 partitions the engine 14, the exhaust gas post-processing device 32, and the hydraulic pump 33, thereby preventing the oil liquid on the hydraulic pump 33 side from scattering to the engine 14 side. Further, the firewall 35 forms one of the structures erected on the revolving frame 6, and the filter-side oil filter bracket 24 is mounted on the right side surface thereof.

  The hydraulic excavator 1 according to the present embodiment has the above-described configuration, and the operation thereof will be described next.

  After the operator gets on the cab 12 and starts the engine 14, the operator can operate the operation lever / pedal (not shown) for traveling, so that the lower traveling body 2 can travel. On the other hand, when the operator operates the left and right front operation levers (not shown), the turning operation of the upper turning body 4 and the excavation of earth and sand by the front device 5 can be performed.

  When the engine 14 is started, sliding parts of the crankshaft, piston, connecting rod, camshaft, rocker arm, turbocharger 17 and the like constituting the engine 14, that is, sliding parts 21 </ b> D to 21 </ b> G of the downstream line 21. The engine oil 18 for lubrication and cooling is supplied by an engine oil supply device 19.

  Specifically, when the engine 14 is started, in the engine oil supply device 19, the oil supply pump 20C of the upstream line 20 is driven, and the engine oil 18 in the oil pan 16 is sucked up through the suction pipe 20A. An engine oil supply device 19 for supplying engine oil 18 is provided. The engine oil 18 sucked up by the upstream line 20 is supplied to an oil filter 25 via a supply pipe 26, and fine foreign matter is removed by the oil filter 25. The engine oil 18 from which fine foreign matter has been removed is returned to the downstream line 21 via the return line 28. In the downstream line 21, after being cooled by the oil cooler 21A, internal sliding parts 21D to 21F serving as sliding parts of a crankshaft, a piston, a connecting rod, a camshaft, a rocker arm, etc., by an oil gallery 21B, and turbocharging. The engine oil 18 is supplied to an external sliding portion 21 </ b> G which is a sliding portion of the machine 17. Thereby, each of the sliding portions 21D to 21G can be lubricated and cooled by the engine oil 18.

  The oil filter 25 from which foreign matter is removed needs to be periodically replaced. Therefore, the replacement operation of the oil filter 25 will be described. First, the oil filter 25 moves from the front side of the engine 14 to the right side of the firewall 35 facing the right side cover 13B of the exterior cover 13 by the filter moving line 22 having the supply pipe 26 and the return pipe 28. Have been.

  Therefore, as shown in FIG. 3, by opening the right side cover 13B of the exterior cover 13, the oil filter 25 can be exposed through the maintenance opening 13D. After the oil filter 25 is exposed, the oil filter 25 can be removed from the filter-side oil filter bracket 24 by reaching out from the outside and rotating the oil filter 25 in the horizontal direction using a special tool. On the other hand, a new oil filter 25 can be attached to the filter-side oil filter bracket 24 using a special tool.

  Here, when the engine 14 is stopped, the engine oil 18 in the supply pipe 26 is returned to the oil pan 16, and the engine oil 18 in the return pipe 28 is returned to the oil pan 16 via the downstream line 21. . In this case, in the present embodiment, the oil filter 25 is arranged at a position away from the normal mounting position of the engine 14 by the supply line 26 and the return line 28. For this reason, the distance from the oil pan 16 to each of the sliding portions 21D to 21G is long. Therefore, when the engine 14 is started, there is a possibility that the sliding starts with an insufficient oil film formed on each of the sliding portions 21D to 21G.

  In particular, the external sliding portion 21G provided on the turbocharger 17 located outside the engine 14 is located at a position far from the inlet 15C of the engine block 15 and at a higher position. . Further, the turbocharger 17 (the external sliding portion 21G) rotates at a high speed immediately after the engine 14 is started. Therefore, the external sliding portion 21 </ b> G easily runs out of the engine oil 18 when the engine 14 is stopped, and also requires time from when the engine 14 is started to when the engine oil 18 is supplied.

  However, according to the present embodiment, engine oil 18 is stored in supply pipe 26 between outlet 15B of engine block 15 and oil filter 25 constituting engine 14 while engine 14 is stopped. A supply-side oil reservoir 30 is provided. A return oil reservoir 31 for storing engine oil 18 when the engine 14 is stopped is provided in the return pipe 28 between the oil filter 25 and the inlet 15C of the engine block 15.

  Therefore, when the engine 14 is stopped, the engine oil 18 in the supply pipe 26 is returned to the oil pan 16 side by gravity, but a part of the engine oil 18 is stored in the supply-side oil reservoir 30 as the storage oil 18A. Can be stored. Although the engine oil 18 in the return pipe 28 is moved toward the engine 14 by gravity, a part of the engine oil 18 can be stored in the return oil reservoir 31 as the storage oil 18A.

  As a result, when the engine 14 is started, the engine oil 18 from the oil pan 16 presses the pool oil 18A via the air in each of the pipes 26 and 28, so that the engine oil 18 is less than the engine oil 18 from the oil pan 16. The engine oil 18 can be quickly supplied to the sliding portions 21D to 21G. As a result, even when the oil filter 25 is arranged at a position distant from the normal mounting position of the engine 14, the engine oil 18 can be promptly supplied to each of the sliding parts 21D to 21G when the engine 14 is started.

  The supply-side oil reservoir 30 is provided on a supply hose 27 that forms the supply pipe 26. The return-side oil reservoir 31 is provided on a return hose 29 that forms the return line 28. Therefore, for example, the oil reservoirs 30 and 31 can be easily provided using a flexible resin hose.

  Each of the oil reservoirs 30 and 31 is formed as a U-shaped conduit bent in a U-shape toward the lower side. As a result, the engine oil 18 can be stored in a simple U-shaped structure, and can be easily adapted to existing models.

  Next, FIGS. 7 to 10 show a second embodiment of the present invention. The feature of this embodiment is that the oil filter is moved to the rear side of the engine, the engine cover of the outer cover is opened, and the oil filter is replaced. Note that, in the present embodiment, the same components as those in the above-described first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

  7 and 8, a filter moving line 41 according to the second embodiment includes an engine-side oil filter bracket 23, a filter-side oil filter bracket 24, and an oil filter 25 described in the first embodiment, and will be described later. It comprises a supply hose 42 (supply pipe), a return hose 43 (return pipe), a supply-side oil reservoir 44, and a return-side oil reservoir 45.

  As shown in FIG. 9, the filter-side oil filter bracket 24 is disposed on the rear side of the engine 14, and is mounted on the front surface of the central weight portion 7B of the counterweight 7 via a mounting plate 24C. That is, the filter-side oil filter bracket 24 and the oil filter 25 are arranged at a position farther from the engine-side oil filter bracket 23 than in the first embodiment.

  Accordingly, the supply hose 42 and the return hose 43 according to the second embodiment are formed longer than the supply hose 27 and the return hose 29 according to the first embodiment. Then, as shown in FIGS. 8 and 10, the supply hose 42 is provided with a supply-side oil reservoir 44 located near the filter-side oil filter bracket 24. The return hose 43 is provided with a return-side oil reservoir 45 located near the filter-side oil filter bracket 24. Each of the oil reservoirs 44 and 45 has the same configuration as the oil reservoirs 30 and 31 according to the first embodiment, and a description thereof will be omitted.

  Thus, in the second embodiment configured as described above, similarly to the first embodiment, by opening the engine cover 13C of the outer cover 13, the oil filter 25 can be easily replaced from the outside. can do. In addition, the oil reservoirs 44 and 45 allow the engine oil 18 to be supplied immediately after the engine 14 is started.

  Next, FIGS. 11 to 13 show a third embodiment of the present invention. The feature of this embodiment is that the supply-side oil reservoir is provided in the supply oil passage of the oil filter bracket, and the return-side oil reservoir is provided in the return oil passage of the oil filter bracket. Note that, in the present embodiment, the same components as those in the above-described first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

  In FIG. 11, the filter moving line 51 according to the third embodiment includes an engine-side oil filter bracket 23 and an oil filter 25 described in the first embodiment, and a filter-side oil filter bracket 52 and a supply hose 53 described later. (Supply pipe), a return hose 54 (return pipe), a supply-side oil reservoir 55, and a return-side oil reservoir 56.

  The filter-side oil filter bracket 52 according to the third embodiment is disposed on the rear side of the engine 14, and is mounted on the front surface of the central weight portion 7B of the counterweight 7 via a mounting plate (not shown). That is, the filter-side oil filter bracket 52 and the oil filter 25 are arranged at a position farther from the engine-side oil filter bracket 23 than in the first embodiment. The filter-side oil filter bracket 52 is for attaching the oil filter 25 and is connected to the oil filter 25. As shown in FIGS. 12 and 13, a supply oil passage 52A for receiving the supply of the engine oil 18 and a return oil passage 52B for returning the engine oil 18 to the engine 14 are formed in the filter-side oil filter bracket 52. ing.

  As shown in FIG. 11, the supply hose 53 and the return hose 54 according to the third embodiment are formed longer than the supply hose 27 and the return hose 29 according to the first embodiment. The supply hose 53 and the return hose 54 are not provided with an oil reservoir.

  As shown in FIGS. 12 and 13, the supply-side oil reservoir 55 is provided in a supply oil passage 52 </ b> A of the filter-side oil filter bracket 52. The return-side oil reservoir 56 is provided in the return oil passage 52 </ b> B of the filter-side oil filter bracket 52. Each of the oil reservoirs 55 and 56 has the same basic structure as the oil reservoirs 30 and 31 according to the first embodiment, and a description thereof will be omitted.

  Thus, in the third embodiment configured as described above, similarly to the first embodiment described above, by opening the engine cover 13C of the outer cover 13, the oil filter 25 can be easily replaced from the outside. can do. On this, the supply oil 18A is supplied by the supply oil reservoir 55 provided in the supply oil passage 52A of the filter oil filter bracket 52 and the return oil reservoir 56 provided in the return oil passage 52B after the engine 14 is started. Can be supplied immediately.

  The first embodiment exemplifies a case in which the supply-side oil reservoir 30 is provided in the supply line 26 and the return-side oil reservoir 31 is provided in the return line 28. However, the present invention is not limited to this. The supply oil reservoir 30 may be provided in the supply pipe 26 and the return oil reservoir 31 of the return pipe 28 may be omitted. Further, the return oil reservoir 31 may be provided in the return pipe 28, and the supply oil reservoir 30 of the supply pipe 26 may be omitted. These configurations can be similarly applied to other embodiments.

  In each embodiment, the crawler type hydraulic excavator 1 has been described as an example of a construction machine in each embodiment. However, the present invention is not limited to this, and can be widely applied to other construction machines such as a wheel-type hydraulic excavator, a hydraulic crane, and a wheel loader.

1 Hydraulic excavator (construction equipment)
2 Undercarriage (body)
4 Upper revolving superstructure (body)
14 Engine 15 Engine block 15B Outlet 15C Inlet 18 Engine oil 18A Reservoir oil 24, 52 Filter side oil filter bracket (oil filter bracket)
24A, 52A Supply oil passage 24B, 52B Return oil passage 25 Oil filter 26 Supply conduit 27, 42, 53 Supply hose 28 Return conduit 29, 43, 54 Return hose 30, 44, 55 Supply oil reservoir (oil reservoir) Part)
31, 45, 56 Return oil reservoir (oil reservoir)

Claims (3)

A self-propelled vehicle body, an engine provided in the vehicle body having an outflow port through which engine oil flows out and an inflow port through which engine oil flows, and an oil filter for removing foreign substances contained in the engine oil of the engine And a return line connecting the oil filter and the inflow port, and a supply line connecting the outflow port and the oil filter of the engine,
A construction machine characterized in that at least one of the supply pipeline and the return pipeline is provided with an oil reservoir for storing engine oil when the engine is stopped. An oil filter bracket for attaching the oil filter is provided connected to the oil filter,
A supply oil passage for receiving supply of engine oil and a return oil passage for returning engine oil to the engine side are formed in the oil filter bracket,
The supply pipe is configured to include a supply hose that connects the outflow port of the engine and the oil filter bracket, and the supply oil path that connects the supply hose and the oil filter,
The return pipe is configured to include a return hose connecting the oil filter bracket and the inflow port of the engine, and the return oil path connecting the oil filter and the return hose,
The construction machine according to claim 1, wherein the oil reservoir is provided in at least one of the supply oil passage and the return oil passage.   The construction machine according to claim 1, wherein the oil reservoir is formed as a U-shaped pipe which is bent downward in a U-shape.

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