JP6810082B2 - Construction machinery - Google Patents

Description

The present invention relates to a construction machine such as a hydraulic excavator provided with an air cleaner for supplying clean outside air to an engine.

In general, a hydraulic excavator as a typical example of a construction machine is composed of a lower traveling body capable of self-propelling and an upper rotating body provided so as to be swivel on the upper side of the lower traveling body. The device is provided so that it can move up and down.

The upper swivel body includes a swivel frame extending in the front, rear, front, and rear directions orthogonal to the swivel center in the left and right directions, respectively, and a counter weight provided at the rear position of the swivel frame. A partition plate that is erected on the swivel frame with a space on the front side of the counter weight and extends to the left and right of the swivel frame, an engine accommodation chamber formed between the counter weight and the partition plate, and engine accommodation. The engine located in the chamber and installed horizontally on the swivel frame, the heat exchanger located on the left and right sides of the engine and located in the engine housing chamber, and the cooling sucked from the outside. Of the suction-type cooling fan that allows air to flow through the heat exchanger, the exterior cover with left and right side plates and top plates that cover the engine housing, and the left and right side plates that face the heat exchanger. It is located in the engine accommodation chamber located between the side plate on one side located on one side and the heat exchanger, and includes an air cleaner connected to the engine via an intake pipe (for example, Patent Document 1). reference).

Japanese Unexamined Patent Publication No. 2004-352306

According to Patent Document 1, by arranging the air intake for cooling the engine and the outside air intake for intake of the air cleaner separately from each other, the air cleaner sucks in the air whose temperature has risen due to the heat generated by the heat exchanger and the engine. I try not to. However, the heat generated by the heat exchanger and the engine heats not only the surrounding air but also the entire air inside the exterior cover, so the air cleaner sucks in this warmed air, which reduces the intake efficiency of the engine. There's a problem.

Therefore, in order to supply the air cleaner with cold outside air, it is conceivable to open the air intake port of the air cleaner directly to the side plate of the exterior cover. However, this configuration has a problem that the risk of sucking foreign matter and rainwater together with the outside air increases.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to provide a construction machine capable of improving the intake efficiency of an engine by supplying clean and cold air to an air cleaner. There is.

The present invention includes a self-propelled lower traveling body and an upper swivel body provided so as to be swivel above the lower traveling body, and the upper swivel body is forward, backward and forward with respect to a swivel center. , A swivel frame extending in the left and right directions orthogonal to the rear direction, a counter weight provided at the rear position of the swivel frame, and a space on the swivel frame on the front side of the counter weight. A partition plate erected extending in the left and right directions of the swivel frame, an engine accommodating chamber formed between the counter weight and the partition plate, and the swivel frame located in the engine accommodating chamber. An engine installed horizontally, a heat exchanger located on one side in the left and right directions with respect to the engine, and a heat exchanger arranged in the engine housing chamber, and cooling air sucked from the outside to heat the engine. Of the suction-type cooling fan distributed to the exchanger, the exterior cover having the left and right side plates and the top plate covering the engine housing chamber, and the left and right side plates facing the heat exchanger. In a construction machine provided with an air cleaner located in the engine housing chamber located between the side plate on one side located on the one side and the heat exchanger and connected to the engine via an intake pipe. An engine intake chamber located opposite to the counter weight and adjacent to the engine accommodating chamber is provided with respect to the partition plate, and the partition plate is provided on the side plate on one side forming the exterior cover. A cooling air inlet for the heat exchanger to which the cooling air for the heat exchanger flows in is provided at the rear side of the position of the partition plate, and is located at the front side of the partition plate for the engine. An engine outside airflow inlet into which the outside air for the engine flows toward the intake chamber is provided, and the partition plate is provided with a suction port that opens into the engine intake chamber and is connected to the suction side of the air cleaner. The partition plate is provided with a baffle plate that guides the outside air that has flowed into the engine intake chamber from the engine outside airflow inlet toward the suction port.

According to the present invention, clean and cold air can be supplied to the air cleaner, and the intake efficiency of the engine can be improved.

It is a front view which shows the hydraulic excavator which concerns on embodiment of this invention. It is a top view which shows the upper swing body of the hydraulic excavator of FIG. 1 in an enlarged state with a part of an exterior cover omitted. It is a perspective view of the main part enlarged which shows the left rear part of the upper swing body with the counterweight, the cab and the exterior cover omitted. It is sectional drawing which enlarged the left rear part of the upper swivel body from the direction of arrow IV-IV in FIG. It is a perspective view which shows a part of a partition plate, a suction port and a baffle plate in an assembled state. FIG. 5 is an exploded perspective view of a state in which the baffle plate is separated from a part of the partition plate as viewed from the same position as in FIG.

Hereinafter, as a typical example of the construction machine according to the embodiment of the present invention, a rear super-swivel type hydraulic excavator will be taken as an example, and will be described in detail with reference to FIGS. 1 to 6. In the present embodiment, the horizontal directions orthogonal to the front and rear directions are the left and right directions with respect to the front and rear directions of the upper swivel body, and the configuration, arrangement, and air flow direction of each device and member are defined. explain.

In FIGS. 1 and 2, the hydraulic excavator 1 as a construction machine includes a self-propelled crawler-type lower traveling body 2 and an upper rotating body 2 provided on the lower traveling body 2 so as to be able to turn around a turning center O. 3 and a front device 4 provided on the front portion of the upper swivel body 3 so as to be able to move up and down. The front device 4 is used for excavating earth and sand.

Here, the upper swivel body 3 of the rear ultra-small swivel type hydraulic excavator 1 is within a predetermined range with respect to the width dimension (total width) in the left and right directions of the lower traveling body 2 with reference to the swivel center O. It is configured to turn. Specifically, the predetermined range with respect to the total width of the lower traveling body 2 indicates a range within 130% of the total width of the lower traveling body 2. The upper swivel body 3 of the rear ultra-small swivel type hydraulic excavator 1 is set so that the arc-shaped locus drawn by the rear surface of the counterweight 6 described later falls within a range of 130% or less of the total width described above.

The swivel frame 5 constitutes a support structure for the upper swivel body 3. As shown in FIG. 2, the swivel frame 5 is erected on a flat bottom plate 5A made of a thick steel plate or the like extending in the front and rear directions (as a reference) with respect to the swivel center O, and the bottom plate 5A. Left vertical plate 5B, right vertical plate 5C, bottom plate 5A, each vertical plate 5B, 5C extending in the front and rear directions at predetermined intervals in the left and right directions with respect to the turning center O to the outside in the left and right directions. Overhanging beams 5D (only one is shown), which are provided with a plurality of overhanging beams in the front and rear directions, and each of the vertical plates 5B and 5C extending in the left and right directions with an interval in the front and rear directions. It is configured to include a left side frame 5E and a right side frame 5F attached to the tip end side of the beam 5D.

The foot portion of the front device 4 is rotatably supported at the front positions of the left vertical plate 5B and the right vertical plate 5C. On the other hand, counterweights 6, which will be described later, are attached to the rear positions of the left vertical plate 5B and the right vertical plate 5C.

The counterweight 6 balances the weight with the front device 4 and is provided at the rear position of the swivel frame 5. Here, the counterweight 6 is arranged at a position close to the turning center O of the upper swinging body 3, and the rear surface of the counterweight 6 is formed in an arc shape centered on the turning center O of the upper swinging body 3.

The partition plate 7 is erected on the swivel frame 5 so as to have a space on the front side of the counterweight 6 and extend in the left and right directions of the swivel frame 5. Specifically, the partition plate 7 is located between the left side plate 14A of the exterior cover 14 described later and the hydraulic oil tank 26, and is formed as a front wall covering the front side of the engine 10 and the heat exchanger 12 described later. There is. As a result, the partition plate 7 forms an engine accommodating chamber 9, which will be described later, in which the engine 10, the heat exchanger 12, and the like are arranged, between the counterweight 6.

Here, of the partition plates 7 extending in the left and right directions, the outside in the left and right directions of the heat exchanger 12, that is, the front side of the air cleaner 15 described later is the front side of the cooling air inflow chamber 9A of the engine accommodation chamber 9. It is a closing plate 7A in front of the inflow chamber that covers the inflow chamber. As shown in FIGS. 3 to 6, the inflow chamber front closing plate 7A constituting the partition plate 7 is provided with a suction port 22 described later, which is located at the upper closing portion 7A1 at the upper position. The inflow chamber front closing plate 7A partitions the cooling air inflow chamber 9A and the engine intake chamber 21, which will be described later.

As shown in FIG. 4, the upper closed portion 7A1 is provided with a duct connecting portion 7A2 so as to bulge toward the cooling air inflow chamber 9A. The duct connecting portion 7A2 greatly bulges on the left side plate 14A side so that the connecting portion of the duct 18 is inclined with respect to the upper closing portion 7A1. As a result, the duct connecting portion 7A2 can open the duct 18 at an obtuse angle with respect to the flow of air flowing in from the engine outside airflow inlet 14F of the left side plate 14A. With this configuration, the air flowing in from the engine external airflow inlet 14F can smoothly flow toward the duct 18.

Further, the inflow chamber front closing plate 7A is formed with an intake pipe insertion hole 7A3 located below the upper closing portion 7A1. An intake pipe 17 that connects the air cleaner 15 to the engine 10 is inserted into the intake pipe insertion hole 7A3.

As shown in FIG. 2, the rear closing plate 8 is erected at the rear position of the swivel frame 5 extending in the left and right directions so as to extend along the front surface of the counterweight 6. After this, the closing plate 8 closes the rear side of the engine accommodating chamber 9 together with the front surface of the counterweight 6.

The engine accommodating chamber 9 is formed between the counterweight 6 (rear closing plate 8) and the partition plate 7. Further, the left, right side and upper side of the engine accommodating chamber 9 are covered with an exterior cover 14 described later. As a result, the engine accommodating chamber 9 is formed over the entire length of the upper swing body 3 in the left and right directions. The engine accommodating chamber 9 accommodates the engine 10, the hydraulic pump 11, the heat exchanger 12, and the air cleaner 15 therein.

Of the engine housing chambers 9 formed long in the left and right directions with respect to the turning center O, the left position on one side in the left and right directions is upstream in the flow direction of the cooling air for the heat exchanger 12. It is located on the side and serves as a cooling air inflow chamber 9A. The cooling air inflow chamber 9A is surrounded by a partition plate 7, a rear closing plate 8, a heat exchanger 12, a left side plate 14A of the exterior cover 14, and a top plate 14C. External air flows into the cooling air inflow chamber 9A through the main inflow port 14D and the cooling air inflow port 14E provided on the left side plate 14A of the exterior cover 14.

The engine 10 is located in the engine accommodating chamber 9 and is provided in the turning frame 5 in a horizontal position extending in the left and right directions. A suction type cooling fan 13, which will be described later, is provided at the left side position on the left and right sides of the engine 10, and a hydraulic pump 11 described later is provided at the right side position on the other side in the left and right directions. Has been done.

On the other hand, for example, an exhaust manifold 10A is provided on the front side of the engine 10, and the exhaust manifold 10A is provided with a supercharger 10B that forcibly sends air into each cylinder of the engine 10 by using exhaust gas. Has been done. An intake pipe 17, which will be described later, is connected to the air supply port of the turbocharger 10B. Further, a water jacket (not shown) through which cooling water flows is provided inside the engine 10, and the cooling water is cooled by the radiator 12B of the heat exchanger 12.

The hydraulic pump 11 is provided on the right side of the engine 10. The hydraulic pump 11 is driven by the engine 10 to boost (pressurize) the hydraulic oil supplied from the hydraulic oil tank 26, which will be described later, and supply the hydraulic oil to various actuators such as the front device 4. The hydraulic oil that drives the various actuators is cooled by the oil cooler 12C of the heat exchanger 12, which will be described later, and then recirculated to the hydraulic oil tank 26.

The heat exchanger 12 is located on the left side in the left and right directions with respect to the engine 10 and is arranged in the engine accommodation chamber 9. The heat exchanger 12 is provided on the rear side of the swivel frame 5 facing the cooling fan 13 described later. The heat exchanger 12 cools various fluids whose temperature has risen by cooling air.

Specifically, the heat exchanger 12 is parallel to the square frame-shaped frame body 12A arranged so that the front and rear directions orthogonal to the flow direction of the cooling air are the horizontal width direction, and the frame body 12A. It is configured to include a radiator 12B, an oil cooler 12C, and an intercooler 12D arranged in the front and rear directions so as to be.

Here, the radiator 12B cools the engine 10 to cool the cooling water whose temperature has risen. The oil cooler 12C cools the hydraulic oil supplied to various actuators of the hydraulic excavator 1 and whose temperature has risen, and returns it to the hydraulic oil tank 26. Further, the intercooler 12D cools the intake air whose temperature has risen in the supercharger 10B of the engine 10 and supplies it into each cylinder of the engine 10.

The cooling fan 13 is provided between the engine 10 and the heat exchanger 12, and is rotated by, for example, the engine 10. The cooling fan 13 is arranged in a straight line in the left and right directions with the engine 10 and the heat exchanger 12, and is a suction type cooling fan that circulates the cooling air sucked from the outside of the exterior cover 14 described later to the heat exchanger 12. It is configured as. Then, the cooling fan 13 can supply the cooling air to the heat exchanger 12 by sucking the cooling air from the outside. The cooling fan 13 may be separated from the engine 10 and rotated by using an electric motor or a hydraulic motor.

The exterior cover 14 is located between the counterweight 6 and the cab 25, which will be described later, and is provided on the swivel frame 5. The exterior cover 14 covers the on-board equipment on the swivel frame 5 including the engine 10, the hydraulic pump 11, and the heat exchanger 12. The exterior cover 14 is composed of a left side surface plate 14A, a right side surface plate 14B, and a top surface plate 14C that cover the engine accommodating chamber 9.

Specifically, the exterior cover 14 has a left side plate 14A erected on the left side frame 5E of the swivel frame 5 so as to cover the left side of the heat exchanger 12 and a right side so as to cover the right side of the hydraulic pump 11. The right side plate 14B erected on the frame 5F and the top plate 14C (1) extending left and right over the upper parts of the side plates 14A and 14B and covering the upper side of the engine 10, the hydraulic pump 11, and the heat exchanger 12. (See FIG. 1) and is included.

Here, the left side plate 14A, which is on the upstream side in the flow direction of the cooling air, is provided with the main inflow port 14D located in a wide range from the middle portion in the upper and lower directions to the lower portion. The cooling air for the heat exchanger 12 flows into the main inflow port 14D mainly toward the engine accommodating chamber 9. Further, a cooling air inflow port 14E is provided at an upper position of the left side plate 14A, which is above the main inflow port 14D, and is located behind the position of the partition plate 7. The cooling air inlet 14E is a dedicated opening of the heat exchanger 12 that allows the cooling air for the heat exchanger 12 to flow in toward the engine accommodating chamber 9.

On the other hand, at the upper position of the left side plate 14A, the engine outside airflow inlet 14F is provided located on the front side of the position of the partition plate 7. The engine outside airflow inlet 14F is a dedicated opening for inflowing air (outside air) for suction by the engine 10 toward the engine intake chamber 21, which will be described later. Since the engine external airflow inlet 14F is arranged to face the baffle plate 23 described later in the left and right directions, the outside air flowing in from the engine external airflow inlet 14F is positively directed toward the baffle plate 23. It is designed to flow.

The air cleaner 15 faces the heat exchanger 12 and is located between the left side plate 14A of the exterior cover 14 and the heat exchanger 12 and is arranged in the engine accommodating chamber 9. That is, the air cleaner 15 is located in the cooling air inflow chamber 9A of the engine accommodating chamber 9 and is mounted on the mounting base 16. The mounting base 16 is provided, for example, extending in the front and rear directions over the inflow chamber front closing plate 7A and the rear closing plate 8 of the partition plate 7.

The air cleaner 15 purifies the air sucked by the engine 10, and is configured as a centrifugal type air cleaner that removes foreign substances such as dust by using centrifugal force. The air cleaner 15 purifies the air (outside air) sucked through the air guide plate 23, the suction port 22, and the duct 18, which will be described later, and supplies the air (outside air) to the supercharger 10B of the engine 10 via the intake pipe 17. The air cleaner 15 has a filter element (not shown) built in a cylindrical container extending in the front and rear directions, and an intake port 15A (see FIG. 4) is provided near the upper front side. The downstream side of the duct 18 is connected to the intake port 15A. On the other hand, the upstream side of the duct 18 is connected to the suction port 22 via the duct connecting portion 7A2 provided in the inflow chamber front closing plate 7A of the partition plate 7.

Here, the air guide plate 23 opens toward the engine outside airflow inlet 14F of the left side plate 14A, thereby sucking the cold air that has just flowed into the engine intake chamber 21, which will be described later, into the air cleaner 15. It can be supplied to the engine 10.

The front closing plate 19 is erected on the swivel frame 5 so as to face the front side of the inflow chamber front closing plate 7A of the partition plate 7 at intervals. At the right end portion, which is the inner part of the front closing plate 19, a back closing plate 20 extending rearward toward the partition plate 7 is provided. As a result, the range surrounded by the partition plate 7, the left side surface plate 14A of the exterior cover 14, the front closing plate 19, and the back closing plate 20 becomes the engine intake chamber 21 described later.

The engine intake chamber 21 is located on the front side of the partition plate 7 opposite to the counterweight 6, and is provided adjacent to the engine accommodating chamber 9. The engine intake chamber 21 is provided separately from the engine accommodating chamber 9 at a position on the front side of the partition plate 7. The engine intake chamber 21 is surrounded by a partition plate 7, a left side plate 14A of the exterior cover 14, a front closing plate 19, and a back closing plate 20. The engine intake chamber 21 is introduced to the outside through the engine outside airflow inlet 14F provided on the left side surface plate 14A of the exterior cover 14. The engine intake chamber 21 is provided with a baffle plate 23, which will be described later.

The suction port 22 is provided in the upper closing portion 7A1 forming the closing plate 7A in front of the inflow chamber of the partition plate 7. The suction port 22 is formed as, for example, a long rectangular opening in the left and right directions, and is connected to the duct connecting portion 7A2. The suction port 22 is connected to the duct 18 on the suction side of the air cleaner 15 by opening to the intake chamber 21 for the engine. In the suction port 22, the engine 10 serving as a heat source and the heat exchanger 12 side (left and right sides in the right direction) are covered with a baffle plate 23.

Next, the configuration and function of the baffle plate 23, which is a characteristic portion of the present embodiment, will be described in detail.

The baffle plate 23 is provided on the partition plate 7 to guide the outside air flowing into the engine intake chamber 21 from the engine outside airflow inlet 14F provided on the left side surface plate 14A of the exterior cover 14 toward the suction port 22. There is. The baffle plate 23 is formed so that the surface facing the engine external airflow inlet 14F, that is, the left surface is open to the engine intake chamber 21.

Specifically, as shown in FIGS. 5 and 6, the baffle plate 23 faces the suction port 22 at a distance from the rectangular side surface portion 23A and the upper edge portion of the side surface portion 23A toward the partition plate 7. It has a triangular or trapezoidal upper surface portion 23B extending from the surface. Further, a back bottom portion 23C is provided on the right edge portion of the side surface portion 23A so as to close the opening of the baffle plate 23 on the engine 10 side. In the baffle plate 23, the upper surface portion 23B and the back bottom surface portion 23C are attached to the partition plate 7. The baffle plate 23 can also be integrally formed with the partition plate 7 by bending a part of the plate body forming the partition plate 7.

The baffle plate 23 is provided so as to cover about half of the total length of the suction port 22 in the left and right directions on the right side where the engine 10 and the heat exchanger 12 which are heat sources are arranged. In this case, the upper surface portion 23B of the baffle plate 23 is fixed to the upper closing portion 7A1 of the inflow chamber front closing plate 7A with the rear edge portion on the partition plate 7 side located near the upper side of the suction port 22. ing. Further, in the back bottom surface portion 23C of the baffle plate 23, the rear end edge portion is located near the right side of the suction port 22 and is fixed to the upper closing portion 7A1. When the right end portion of the side surface portion 23A is fixed to the upper closing portion 7A1, the back bottom portion 23C can be omitted.

As a result, the baffle plate 23 is opened with the left side surface facing the engine external airflow inlet 14F provided on the left side surface plate 14A of the exterior cover 14 as the inflow opening 23D. As a result, the baffle plate 23 can guide the outside air that has flowed into the engine intake chamber 21 from the engine outside airflow inlet 14F to the suction port 22 from the inflow opening 23D.

On the other hand, between the side surface portion 23A and the partition plate 7 (upper closing portion 7A1), the lower side of the suction port 22 is opened downward to form a discharge opening 23E. The discharge opening 23E is indicated by arrow B when foreign matter or rainwater in the air is about to fall due to its own weight when air flows in the direction of arrow A toward the suction port 22 in the baffle plate 23. By permitting the fall, foreign matter and rainwater are prevented from entering the suction port 22.

The lower side of the side surface portion 23A of the baffle plate 23 extends beyond the suction port 22. The side surface portion 23A has a large distance dimension from the partition plate 7 at the left side position 23A1 close to the engine outside airflow inlet 14F of the exterior cover 14. On the other hand, the side surface portion 23A has a smaller distance dimension from the partition plate 7 at the right side position 23A2 away from the engine external airflow inlet 14F. As a result, the side surface portion 23A is formed as an inclined plate having a large opening on the engine external airflow inlet 14F side. By inclining the side surface portion 23A in this way, as shown by arrow C in FIG. 4, the outside air that has flowed into the engine intake chamber 21 from the engine outside airflow inlet 14F is discharged from the greatly opened inflow opening 23D. By flowing into the baffle plate 23 and flowing along the inclined side surface portion 23A, the air is smoothly guided toward the suction port 22.

Further, the baffle plate 23 is provided at a position separated from the engine outside airflow inlet 14F of the exterior cover 14. Therefore, a foreign matter exclusion space 24 is provided between the engine external airflow inlet 14F and the baffle plate 23. The foreign matter exclusion space 24 is provided with foreign matter (dust, plant fragments, etc.) contained in the air when the air (outside air) flowing into the engine intake chamber 21 from the engine outside airflow inlet 14F flows toward the suction port 22. It forms a space where rainwater, etc.) can fall under its own weight. As a result, the foreign matter exclusion space 24 can remove foreign matter from the air flowing from the engine external airflow inlet 14F toward the suction port 22.

As shown in FIGS. 1 and 2, the cab 25 is provided so as to be located on the left front side of the swivel frame 5. The cab 25 is for the operator to board, and inside the cab 25, a driver's seat on which the operator sits, an operating lever for traveling, an operating lever for working, and the like (none of which are shown) are arranged. Further, the hydraulic oil tank 26 stores hydraulic oil, is located on the front side of the hydraulic pump 11, and is provided on the swivel frame 5. The fuel tank 27 stores the fuel supplied to the engine 10 and is provided on the swivel frame 5 adjacent to the right side of the hydraulic oil tank 26.

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

The operator of the hydraulic excavator 1 gets on the cab 25 of the upper swing body 3 and starts the engine 10 to drive the hydraulic pump 11. As a result, pressure oil is discharged from the hydraulic pump 11, and this pressure oil is supplied to various hydraulic actuators via a control valve device (not shown).

When the operator on the cab 25 operates a traveling operation lever (not shown), the lower traveling body 2 can move the vehicle forward or backward. On the other hand, when the operator in the cab 25 operates an operation lever (not shown) for work, the front device 4 can be moved up and down to perform excavation work of earth and sand.

The exterior cover 14 is provided with a left side plate 14A located on the left side in the left and right directions with respect to the turning center O, and the left side plate 14A is provided with a main inflow port 14D and a cooling air inflow port 14E. .. Therefore, when the hydraulic excavator 1 is operating, the cooling fan 13 sucks outside air into the cooling air inflow chamber 9A of the engine accommodating chamber 9 through the main inflow port 14D and the cooling air inflow port 14E, and the heat exchanger 12 is used as cooling air. Supply. As a result, the heat exchanger 12 can cool the engine cooling water and the hydraulic oil.

On the other hand, the air (outside air) that has flowed into the engine intake chamber 21 from the engine outside airflow inlet 14F of the exterior cover 14 flows into the air cleaner 15 through the suction port 22 and the duct 18, and the air cleaner 15 removes foreign matter. Is cleaned. The purified air is supplied to the engine 10 through the intake pipe 17.

Thus, according to the present embodiment, the engine accommodating chamber 9 (cooling air inflow chamber 9A) is located on the front side of the partition plate 7 opposite to the counterweight 6, that is, on the front side of the partition plate 7. ) Is provided adjacent to the engine intake chamber 21. The left side plate 14A of the exterior cover 14 is provided with a cooling air inflow port 14E located on the rear side of the partition plate 7 and into which the cooling air for the heat exchanger 12 flows toward the engine accommodation chamber 9. An engine outside airflow inlet 14F is provided located in front of the position of the partition plate 7 and into which the outside air for the engine 10 flows toward the engine intake chamber 21. Further, the partition plate 7 is provided with a suction port 22 that opens into the intake chamber 21 for an engine and is connected to the suction side of the air cleaner 15. On top of this, the partition plate 7 is provided with a baffle plate 23 that guides the outside air that has flowed into the engine intake chamber 21 from the engine outside airflow inlet 14F toward the suction port 22.

Therefore, the baffle plate 23 can guide the outside air that has flowed into the engine intake chamber 21 from the engine outside airflow inlet 14F of the exterior cover 14 to the suction port 22. As a result, even if the temperature of the surrounding air rises due to the engine 10 or the heat exchanger 12, the baffle plate 23 can guide only the cold outside air flowing in from the engine outside airflow inlet 14F to the suction port 22. .. As a result, cold air can be supplied to the air cleaner 15, and the intake efficiency of the engine can be improved.

Further, the baffle plate 23 is formed so that the surface facing the engine outside airflow inlet 14F opens into the engine intake chamber 21. As a result, the outside air flowing into the engine intake chamber 21 from the engine outside airflow inlet 14F can be positively guided to the baffle plate 23 by the inflow opening 23D opened on the engine outside airflow inlet 14F side.

The baffle plate 23 is provided at a position separated from the engine external airflow inlet 14F. Therefore, a foreign matter exclusion space 24 for removing foreign matter flowing in from the engine external airflow inlet 14F is provided between the engine external airflow inlet 14F and the baffle plate 23. As a result, the foreign matter exclusion space 24 can allow the foreign matter contained in the air to fall under its own weight. As a result, the foreign matter exclusion space 24 can remove foreign matter from the air flowing from the engine external airflow inlet 14F toward the suction port 22. As a result, clean air can be supplied to the air cleaner 15, and the cleaning work of the air cleaner 15 can be simplified.

The baffle plate 23 has a side surface portion 23A facing the suction port 22 at intervals, and an upper surface portion 23B extending from the upper portion of the side surface portion 23A toward the partition plate 7 and attached to the partition plate 7. The side surface portion 23A and the partition plate 7 are opened downward with a discharge opening 23E below the suction port 22. As a result, when the air flows through the baffle plate 23 toward the suction port 22, the discharge opening 23E can drop foreign matter or rainwater in the air by its own weight, and the foreign matter or the like enters the suction port 22. Can be prevented.

Further, the side surface portion 23A of the baffle plate 23 has a large distance dimension from the partition plate 7 at a position close to the engine external airflow inlet 14F, and is separated from the partition plate 7 at a position away from the engine external airflow inlet 14F. It is formed as an inclined plate with a small distance dimension. Therefore, the side surface portion 23A is formed as an inclined plate having a large opening on the engine external airflow inlet 14F side. As a result, the outside air that has flowed into the engine intake chamber 21 from the engine outside airflow inlet 14F can flow into the baffle plate 23 through the greatly opened inflow opening 23D, and is also a suction port 22 along the inclined side surface portion 23A. It can be distributed smoothly toward.

In the embodiment, the case where the side surface portion 23A of the baffle plate 23 is formed as a flat inclined plate has been described as an example. However, the present invention is not limited to this, and for example, the side surface portion may be formed as an arcuate curved surface. Further, the side surface portion may be formed as a plate body parallel to the partition plate.

In the embodiment, a case where the discharge opening 23E is formed between the side surface portion 23A and the partition plate 7 by opening the lower side of the suction port 22 downward is illustrated. However, the present invention is not limited to this, and a lower surface portion may be provided between the lower portion of the side surface portion 23A and the partition plate 7 to close the side portion 23A.

In the embodiment, the rear super-swivel type crawler type hydraulic excavator 1 has been described as an example as a construction machine, but the present invention is not limited to this, for example, an ultra-small swivel type hydraulic excavator and a wheel type hydraulic excavator. It can be widely applied to other construction machines such as excavators, hydraulic cranes and wheel loaders.

1 Hydraulic excavator (construction machinery)
2 Lower traveling body 3 Upper swivel body 5 Swing frame 6 Counterweight 7 Partition plate 9 Engine accommodation room 10 Engine 12 Heat exchanger 13 Cooling fan 14 Exterior cover 14A Left side plate (side plate on one side)
14B Right side plate 14C Top plate 14E Cooling airflow inlet 14F Engine outside airflow inlet 15 Air cleaner 17 Intake pipe 21 Engine intake chamber 22 Suction port 23 Baffle plate 23A Side part 23B Top surface part 23D Inflow opening 23E Discharge opening 24 Foreign matter exclusion space O turning center

Claims (5)

It is provided with a self-propelled lower traveling body and an upper rotating body provided so as to be able to turn above the lower traveling body.
The upper swivel body
A swivel frame extending in the front, rear, front, and rear directions orthogonal to the center of rotation in the left and right directions, respectively.
A counterweight provided at the rear position of the swivel frame and
A partition plate that has a space on the swivel frame on the front side of the counterweight and is erected extending in the left and right directions of the swivel frame.
An engine accommodating chamber formed between the counterweight and the partition plate,
An engine located in the engine housing chamber and provided horizontally on the turning frame,
A heat exchanger located on one side in the left and right directions with respect to the engine and arranged in the engine housing chamber.
A suction-type cooling fan that circulates the cooling air sucked from the outside to the heat exchanger,
An exterior cover having left and right side plates and a top plate covering the engine housing chamber,
The engine is located in the engine housing chamber and is located between the heat exchanger and the side plate on one side of the left and right side plates facing the heat exchanger. In a construction machine equipped with an air cleaner connected to the air through an intake pipe.
An engine intake chamber located opposite to the counterweight and adjacent to the engine accommodating chamber is provided with respect to the partition plate.
The side plate on one side forming the exterior cover is provided with a cooling air inflow port located behind the position of the partition plate and into which the cooling air for the heat exchanger flows toward the engine accommodating chamber. At the same time, an engine outside airflow inlet is provided located in front of the position of the partition plate and into which the outside air for the engine flows toward the intake chamber for the engine.
The partition plate is provided with a suction port that opens into the intake chamber for the engine and is connected to the suction side of the air cleaner.
A construction machine characterized in that the partition plate is provided with a baffle plate that guides the outside air that has flowed into the engine intake chamber from the engine outside airflow inlet toward the suction port. The construction machine according to claim 1, wherein the baffle plate is formed so that a surface facing the outside airflow inlet for the engine opens into the intake chamber for the engine. The baffle plate is provided at a position separated from the engine external airflow inlet.
The first aspect of claim 1 is characterized in that a foreign matter exclusion space for removing foreign matter flowing in from the engine external airflow inlet is provided between the engine external airflow inlet and the baffle plate. Described construction machinery. The baffle plate has a side surface portion facing the suction port at a distance, and an upper surface portion extending from the upper portion of the side surface portion toward the partition plate and attached to the partition plate.
The construction machine according to claim 1, wherein a lower side of the suction port is opened downward between the side surface portion and the partition plate. The side surface portion of the baffle plate has a large distance dimension from the partition plate at a position close to the engine external airflow inlet, and a distance dimension from the partition plate at a position away from the engine external airflow inlet. The construction machine according to claim 4, wherein the construction machine is formed as an inclined plate having a small size.

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