JP2007016752A - Engine compartment for construction machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an engine compartment for a construction machine, having good performance of cooling operating oil while suppressing the generation of noises even when the thermal load of the operating oil is greater. <P>SOLUTION: The engine compartment comprises a heat exchanger unit 6 including a radiator 3, an oil cooler 4 and an intercooler 5 arranged in parallel to one another, and an auxiliary oil cooler 104 in a predetermined space 60 between the heat exchanger unit 6 and a cooling fan 7 which generates cooling air on the downstream side of the radiator 3 and the intercooler 5. Herein, a pipe 50 and a pipe 51 are provided for guiding operating oil returned from a control valve to a lower tank 104b of the auxiliary oil cooler 104 and for guiding the operating oil guided to the auxiliary oil cooler 104 to an upper tank 4a of the oil cooler 4, respectively. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an engine room equipped with a radiator and an oil cooler that are mounted on a construction machine such as a hydraulic excavator and are arranged in parallel with each other.

  A construction machine shown in FIG. 9, for example, a hydraulic excavator 101 includes an engine chamber 1 in which an engine and a hydraulic pump are housed. The engine is ignited to drive the hydraulic pump, and hydraulic fluid discharged from the hydraulic pump is used. Each actuator is operated to perform excavation work and the like. The engine generates heat during the ignition operation, and the hydraulic oil is heated by frictional heat in the hydraulic pump and hydraulic circuit. Therefore, a heat exchanger such as a radiator or an oil cooler is provided in the engine room in order to cool engine cooling water, hydraulic oil, and the like. In recent years, in order to increase engine output and clean exhaust gas, another heat exchanger, that is, an intercooler, is installed in the engine compartment, and the engine intake that has been heated by the turbo is cooled to cool the engine. In order to increase the charging efficiency and burn it.

  Conventionally, techniques shown in Patent Documents 1 and 2 have been proposed as a heat exchanger disposed in the engine room 1 of the excavator 101 shown in FIG. 9 described above.

Patent Document 1 shows a configuration in which a radiator, an oil cooler, and an aftercooler are arranged in parallel with each other, and a cooling fan that generates cooling air is arranged downstream of these heat exchangers. Patent Document 2 discloses a configuration in which a distribution plate is arranged on the upstream side of a radiator and an oil cooler, and the amount of cooling air for the radiator and the oil cooler is controlled by this distribution plate.
Japanese Patent Laid-Open No. 2003-136972 JP-A-10-280959

  By the way, with a hydraulic excavator 101 as shown in FIG. 9 as a base, an application machine is formed by attaching a special attachment such as a crusher or a gripping tool instead of a bucket, and special work such as dismantling work is performed. Sometimes. In such an operation, the pressure loss in the hydraulic circuit becomes larger, and accordingly, the amount of heat generated by the hydraulic oil increases, and the cooling performance of the hydraulic oil by the oil cooler decreases. In general, when the operating oil becomes high temperature, that is, when the heat load of the operating oil increases, there is a risk of causing oil leakage due to deterioration of a member made of a rubber-based material or wear of hydraulic equipment due to insufficient viscosity of the operating oil.

  As a measure for ensuring good cooling performance of the hydraulic oil when the thermal load of the hydraulic oil becomes large in this way, in the conventional technique shown in Patent Document 1 described above, the rotation speed of the cooling fan is usually set. It is conceivable to set the opening area of the cover that forms the engine compartment larger than usual in order to raise the air flow from the time or increase the passing air volume of the cooling air. However, if the number of rotations of the cooling fan is increased or the opening area of the cover is set to be large as described above, noise is generated and the surrounding environment is adversely affected. Also, for example, in order to ensure good cooling performance of the hydraulic oil when the thermal load of the hydraulic oil becomes large, the oil cooler core is made thicker than normal, and the capacity of the oil cooler is made larger than normal. It is possible to do. However, when the core of the oil cooler is made thicker in this way, there arises a situation in which the temperature of the cooling air is hardly lowered in accordance with the thickness of the core, and therefore, it is difficult to always ensure good cooling performance of the hydraulic oil.

  Moreover, in the prior art shown by patent document 2, when the thermal load of hydraulic fluid becomes large, a bigger distribution board is arrange | positioned and it is comprised so that a big cooling air volume may be ensured with respect to an oil cooler. It is possible. However, normally, a condenser or the like used for air conditioning in the cab is arranged on the upstream side of the heat exchanger. In reality, it is difficult to arrange a large distribution plate. For this reason, even in the prior art disclosed in Patent Document 2, it is difficult to obtain good cooling performance of the hydraulic oil when the thermal load of the hydraulic oil increases.

  The present invention has been made from the above-described prior art, and its purpose is to obtain good cooling performance of hydraulic oil while suppressing the generation of noise even when the thermal load of the hydraulic oil is large. It is to provide an engine room of a construction machine that can be used.

  In order to achieve this object, the present invention includes a radiator and an oil cooler arranged in parallel to each other, and a predetermined space is provided between the radiator and the oil cooler and a cooling fan for generating cooling air. The engine room of the construction machine has an auxiliary oil cooler downstream of the radiator in the predetermined space.

  The present invention configured as described above can cool the working oil guided to the oil cooler by the cooling air passing through the oil cooler arranged in parallel with the radiator, and has not been utilized until now. The hydraulic oil guided to the auxiliary oil cooler can be cooled by the cooling air that has passed through. That is, the cooperation of the auxiliary oil cooler downstream of the radiator and the oil cooler arranged in parallel with the radiator does not increase the number of rotations of the cooling fan, and the opening area of the cover is set to be particularly large. The hydraulic oil can be cooled without any problems. Therefore, even when the thermal load of the hydraulic oil is large, good cooling performance of the hydraulic oil can be obtained while suppressing the generation of noise.

  Further, the present invention is characterized in that, in the above invention, an intercooler is provided in parallel with the radiator and the oil cooler, and the auxiliary oil cooler is disposed downstream of both the radiator and the intercooler.

  Moreover, the present invention is characterized in that, in the above-mentioned invention, the auxiliary oil cooler is disposed so as to face the lower portions of the radiator and the intercooler.

  In the present invention, the auxiliary oil cooler is attached to a bracket that is supported by a cover that forms the engine compartment.

  Further, in the present invention, the present invention is provided with a pipe for guiding the hydraulic oil returned from the control valve to the auxiliary oil cooler and a pipe for guiding the hydraulic oil led to the auxiliary oil cooler to the oil cooler. It is characterized by.

  In the present invention, since the auxiliary oil cooler different from the oil cooler provided in parallel to the radiator is provided downstream of the radiator, the oil load can be increased even when the thermal load of the hydraulic oil is large. The cooling air that passes through the cooler and the cooling air that passes through the radiator and then passes through the auxiliary oil cooler can achieve good cooling performance of the hydraulic oil while suppressing noise generation, without adversely affecting the surrounding environment. It is possible to prevent oil leakage due to deterioration of members made of rubber-based materials provided in the construction machine, and to prevent wear of hydraulic equipment provided in the construction machine due to insufficient viscosity of hydraulic oil. A highly reliable engine room can be secured.

  The best mode for carrying out an engine room of a construction machine according to the present invention will be described below with reference to the drawings.

  FIG. 1 is a perspective view showing an embodiment of an engine room of a construction machine according to the present invention. FIG. 2 is a perspective view showing a state in which an engine cover that covers the upper portion is removed in the embodiment shown in FIG. These are side views of this embodiment.

  The present embodiment is an engine room 1 provided in a construction machine, for example, an application machine equipped with a special attachment instead of a bucket using a hydraulic excavator as shown in FIG. 9 as a base, and the engine room 1 is a steel plate. Etc. Front side covers 21, 26, 27, side covers 22, 25, counterweight side covers 23, 24, top covers 28, 29, bottom covers 31, 32, 33, and engine cover 30 covering the top Is formed. A counterweight 15 is provided so as to enclose the above-described counterweight side covers 23 and 24 from the rear of the vehicle body.

  In the engine compartment 1, a battery 34, a fuel cooler 17, and a condenser 16 used for air conditioning in the cab are disposed upstream of the generated cooling air flow, and a heat exchanger is disposed downstream of these. Unit 6 is arranged.

  As shown in FIG. 3, a shroud 12 and a cooling fan 7 for generating cooling air are disposed downstream of the heat exchanger unit 6, and an engine 2 and a hydraulic pump 14 are disposed behind the cooling fan 7. Yes.

  As shown in FIG. 3, the cooling fan 7 is attached to the engine 2 via a fan pulley 8 and a water pump drive shaft 9. A crank pulley 11 is directly connected to the crankshaft 10 so that the crank pulley 11 and the fan pulley 8 can transmit a rotational force via fan belts 13a and 13b.

  As shown in FIG. 1, of the covers forming the outer shell of the engine 1, the side cover 22 has openings 22 a and the upper covers 28 and 29 have openings 28 a and 29 a. ing. The engine cover 30 is also provided with openings 30a, 30b, 30c, 30d, 30e, 30f, 30g, and 30h. These openings 22a, 28a, 29a, 30a, 30b, 30c, 30d, 30e, 30f, 30g, 30h communicate the atmosphere side with the interior of the engine compartment 1.

  4 is an AA arrow view of FIG. 3, FIG. 5 is a BB arrow view of FIG. 3, and FIG. 6 is a CC arrow view of FIG.

  The heat exchanger unit 6 described above includes, for example, an oil cooler 4, a radiator 3, and an intercooler 5. The oil cooler 4, the radiator 3, and the intercooler 5 are arranged in parallel with each other in this order from the side closer to the front of the vehicle body. .

  As shown in FIG. 4, a seal material 20 a is provided between the oil cooler 4 and the radiator 3, and a seal material 20 b is provided between the radiator 3 and the intercooler 5. The oil cooler 4, the radiator 3, and the intercooler 5 are supported and integrated by frames 19a, 19b, and 19c.

  The fuel cooler 17 and the condenser 16 described above are supported by brackets 18a and 18b attached to the frame 19c of the heat exchanger unit 6, as shown in FIG.

  As shown in FIG. 5, the oil cooler 4 is provided with an upper tank 4a on the upper side and a lower tank 4b on the lower side. Similarly, the radiator 3 includes an upper tank 3a on the upper side and a lower tank 3b on the lower side, and the intercooler 5 includes an upper tank 5a on the upper side and a lower tank 5b on the lower side.

  As shown in FIG. 5, the upper tank 3a of the radiator 3 is formed with an inlet 3a1 to which an unillustrated inlet pipe for cooling water led from the engine 2 to the radiator 3 is connected, and the lower tank 3b has cooling water. An outlet 3b1 to which an outlet pipe (not shown) is connected is formed. The above-described inlet pipe and outlet pipe (not shown) are connected to the cooling water pipe of the engine 2.

  In this embodiment, as shown in FIG. 6, for example, a predetermined space 60 formed between the heat exchanger unit 6 including the radiator 3, the oil cooler 4, and the intercooler 5 and the cooling fan 7, for example, The auxiliary oil cooler 104 is provided downstream of both the radiator 3 and the intercooler 5. The auxiliary oil cooler 104 is attached so as to face mainly the lower portions of the radiator 3 and the intercooler 5 by brackets 104 c and 104 d fixed to the frame 19 c of the heat exchanger unit 6.

  Further, as shown in FIG. 5, after driving each actuator, the hydraulic oil piping 50 returned via a control valve (not shown) is connected to the lower tank 104 b of the auxiliary oil cooler 104. The upper tank 104 a of the auxiliary oil cooler 104 and the upper tank 4 a of the oil cooler 4 are connected by a pipe 51. The lower tank 4b of the oil cooler 4 and a hydraulic oil tank (not shown) are connected by a pipe 52.

  As shown in FIG. 5, the upper tank 5a of the intercooler 5 is provided with an inlet 5a1 connected to a pipe (not shown) on the turbocharger side, and the lower tank 5b is provided with an engine intake outlet 5b1. Yes. The outlet 5b1 is connected to a cylinder pipe (not shown) of the engine 2.

  Next, the operation of this embodiment will be described.

  When the engine 2 is ignited, the power of the crankshaft 10 shown in FIG. 3 is transmitted through the crank pulley 11, the fan belts 13 a and 13 b and the fan pulley 8, the cooling fan 7 rotates, and the cooling air flows into the engine compartment 1. Is born. The cooling air flows from the opening 22 a of the side cover 22, the opening 28 a of the upper cover 28, and the opening 30 a of the engine cover 30, and configures the heat exchanger unit 6 while passing through the heat exchanger unit 6. The oil cooler 4, the radiator 3, and the intercooler 5 are cooled, heated, and heated to high temperature, and then flow into the auxiliary oil cooler 104 to cool the working oil of the auxiliary oil cooler 104, It passes through the vicinity of the hydraulic pump 14 and is released into the atmosphere from the openings 30b, 30c, 30d, 30e, 30f, 30g, and 30h of the engine cover 30.

  The engine intake air is also sucked from the atmosphere, passes through an air cleaner (not shown), is supplied by a turbocharger (not shown), reaches a high temperature of 100 ° C. or higher, and is sent to the intercooler 5. The engine intake air flows from the inlet 5a1 of the upper tank 5a of the intercooler 5 shown in FIG. 5 and is cooled to 60 ° C. or less by exchanging heat with the cooling air while passing through the inner side of the core. Thereafter, the fuel flows out from the outlet 5b1 of the intercooler 5 provided in the lower tank 5b and flows into the cylinder of the engine 2.

  The engine cooling water is pumped by the water pump drive shaft 9 and sent from the water passage of the engine 2 to the upper tank 3a of the radiator 3, and is cooled by exchanging heat with cooling air while passing through the radiator core. Thereafter, the cooling water exit 3b1 of the radiator 3 provided in the lower tank 3b exits and returns to the engine 2 again.

  Since both the intercooler 5 and the radiator 3 are cooled while the engine intake air or the engine cooling water flows in from the upper tanks 5a and 3a and flows downward, the cooling air after passing through the core has a relatively lower temperature in the lower direction. Low. Therefore, the auxiliary oil cooler 104 disposed so as to face the lower portion of the intercooler 5 and the radiator 3 is cooled by the cooling air having a relatively low temperature. The hydraulic oil returned from the control valve (not shown) flows into the auxiliary oil cooler 104 before the oil cooler 4, but maintains a high temperature just returned from the control valve (not shown). Therefore, the auxiliary oil cooler 104 can ensure a temperature difference between the hydraulic oil and the cooling air effective for heat exchange.

  Since the auxiliary oil cooler 104 is disposed downstream of both the radiator 3 and the intercooler 5, the auxiliary oil cooler 104 is cooled by relatively high-temperature cooling air that has passed through the radiator 3 and the intercooler 5. Since the wind is cooler than the temperature of the cooling air that has passed through the oil cooler 4 with a large amount of heat generation, the auxiliary oil cooler 104 can also ensure good cooling efficiency.

  According to the present embodiment, the working oil guided to the oil cooler 4 can be cooled by the cooling air passing through the oil cooler 4 arranged in parallel with the radiator 3 and has not been utilized so far. The working oil guided to the auxiliary oil cooler 104 can be cooled by the cooling air that has passed through the radiator 3. That is, the cooperation of the auxiliary oil cooler 104 downstream of the radiator 3 and the oil cooler 4 arranged in parallel with the radiator 3 does not increase the rotational speed of the cooling fan 7 and the covers 22, 28, The hydraulic oil can be cooled without setting the opening areas of the openings 22a, 28a, 29a, 30a to 30h of the 29 and 30 to be particularly large.

  Therefore, even when the heat load of the hydraulic oil is large, it is possible to obtain a good cooling performance of the hydraulic oil while suppressing the generation of noise, and the rubber system provided in the construction machine without adversely affecting the surrounding environment It is possible to prevent oil leakage due to deterioration of a member made of material and to prevent wear of hydraulic equipment provided in the construction machine due to insufficient viscosity of hydraulic oil, and to secure a highly reliable engine room 1.

  FIG. 7 is a plan view showing another embodiment of the present invention, and FIG. 8 shows another embodiment of the present invention, which is drawn corresponding to FIG.

  7 and 8, the auxiliary oil cooler 104 is attached to the bracket 104 e placed on the bottom of the frame 19 c of the heat exchanger unit 6, and almost the entire auxiliary oil cooler 104 is attached to the radiator 3 and It is arranged so as to face the intercooler 5, and the upper tank 104 a of the auxiliary oil cooler 104 and the upper tank 4 a of the oil cooler 4 are connected by a relatively short pipe 53. Other configurations are the same as those of the embodiment shown in FIGS.

  In another embodiment configured as described above, the oil cooler 4 is arranged in parallel to the radiator 3 and the intercooler 5, and the auxiliary oil cooler is disposed downstream of the radiator 3 and the intercooler 5 in the predetermined space 60 of the engine chamber 1. Since 104 is arranged, the same effect as the above-described embodiment can be obtained.

  In the embodiment shown in FIGS. 1 to 6 described above, the auxiliary oil cooler 104 is attached to the brackets 104c and 104d fixed to the frame 19c of the heat exchanger unit 6, and the above-described FIGS. In another embodiment, the auxiliary oil cooler 104 is attached to the bracket 104e placed on the bottom of the frame 19c of the heat exchanger unit 6. However, in the present invention, the auxiliary oil cooler 104 is thus configured. It is not restricted to the structure which attaches. For example, a bracket whose ends are supported on each of the front side cover 21 and the counterweight side cover 23 forming the engine chamber 1 may be provided, and the auxiliary oil cooler 104 may be attached to the bracket. Further, the auxiliary oil cooler 104 may be attached to the shroud 12 shown in FIG. 3 via a bracket.

  In each of the above embodiments, the hydraulic oil guided to the auxiliary oil cooler 104 and cooled by the auxiliary oil cooler 104 is guided to the oil cooler 4, and the hydraulic oil is further cooled by the oil cooler 4. . That is, although the auxiliary oil cooler 104 and the oil cooler 4 are arranged in series, the auxiliary oil cooler 104 and the oil cooler 4 may be arranged in parallel with each other.

  In the above embodiment, the heat exchanger unit 6 includes the radiator 3, the oil cooler 4, and the intercooler 5. However, the heat exchanger unit 6 includes only the radiator 3 and the oil cooler 4. The auxiliary oil cooler 104 may be arranged downstream of the radiator 3.

It is a see-through | perspective perspective view which shows one Embodiment of the engine room of the construction machine which concerns on this invention. It is a see-through | perspective perspective view which shows the state except the engine cover which covers the upper part in one Embodiment shown in FIG. It is a side view of this embodiment. It is an AA arrow line view of FIG. It is a BB arrow line view of FIG. It is CC arrow line view of FIG. It is a top view which shows another embodiment of this invention. FIG. 6 is a diagram illustrating another embodiment of the present invention and corresponding to FIG. 5. It is a figure which shows the hydraulic shovel mentioned as an example of the construction machine provided with the engine room made into the object of this embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Engine chamber 2 Engine 3 Radiator 4 Oil cooler 4a Upper tank 4b Lower tank 5 Intercooler 6 Heat exchanger unit 7 Cooling fan 21 Front side cover 23 Counterweight side cover 30 Engine cover 50 Piping 51 Piping 52 Piping 53 Piping 60 Predetermined space 101 Excavator 104 Auxiliary oil cooler 104a Upper tank 104b Lower tank

Claims (5)

In an engine room of a construction machine that includes a radiator and an oil cooler that are arranged in parallel to each other, and that has a predetermined space between the radiator and the oil cooler, and a cooling fan that generates cooling air,
An engine room of a construction machine, wherein an auxiliary oil cooler is provided downstream of the radiator in the predetermined space. In the invention of claim 1,
An engine room of a construction machine, wherein an intercooler is provided in parallel with the radiator and the oil cooler, and the auxiliary oil cooler is disposed downstream of both the radiator and the intercooler. In the invention of claim 2,
An engine room of a construction machine, wherein the auxiliary oil cooler is disposed so as to face a lower portion of the radiator and the intercooler. In the invention according to any one of claims 1 to 3,
An engine room of a construction machine, wherein the auxiliary oil cooler is attached to a bracket supported by a cover forming the engine room. In the invention according to any one of claims 1 to 3,
An engine room of a construction machine, comprising: a pipe for guiding hydraulic oil returned from a control valve to the auxiliary oil cooler; and a pipe for guiding hydraulic oil led to the auxiliary oil cooler to the oil cooler.

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