JP4971938B2 - Construction machinery - Google Patents

Description

  The present invention includes a first cooler disposed in a cooling air flow path, a second cooler disposed upstream of the first cooler, and the first cooler, The present invention relates to a construction machine provided with a dustproof net between the second coolers.

Conventionally, for the purpose of enabling easy and smooth operation of attaching and detaching the dust-proof net of the cooling system structure of the construction machine, the upper part and / or the lower part of the front surface of the oil cooler and / or radiator is used for the air conditioner. A technique is known in which an exposed portion that is not covered with a capacitor is formed, and a dustproof net is configured to be elastically deformable so that it can be taken in and out of the exposed portion (see, for example, Patent Document 1).
JP 2003-49448 A

  By the way, it is usual to arrange a dust-proof net between the first cooler such as a radiator and the second cooler such as a condenser as described in the above-mentioned Patent Document 1. In such a configuration, as described in Patent Document 1 described above, an exposed portion (gap) is formed in the upper part and / or the lower part of the front surface of the second cooler in consideration of workability when the dustproof net is attached and detached. To be done. However, when such an exposed portion is formed, the air flow that flows to the first cooler through the exposed portion without passing through the second cooler is promoted, so that the cooling function by the second cooler is hindered. There was a point.

  Then, this invention aims at provision of the construction machine which can improve the cooling function by a 2nd cooler, without impairing the workability | operativity at the time of attachment or detachment of a dustproof net.

In order to achieve the above object, the present invention includes a first cooler disposed in a flow path of cooling air, and a second cooler disposed upstream of the cooling air from the first cooler. A construction machine equipped with a dustproof net that is mounted between the first cooler and the second cooler and prevents foreign matter from entering the first cooler,
A flexible sheet that is attached to the outer peripheral portion of the second cooler and extends from the outer peripheral portion of the second cooler toward the dustproof net is provided.

  The dependent claims claim some preferred embodiments of the invention.

  ADVANTAGE OF THE INVENTION According to this invention, the construction machine which can improve the cooling function by a 2nd cooler is obtained, without impairing the workability | operativity at the time of attachment or detachment of a dustproof net.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  FIG. 1 is a diagram schematically showing an entire construction machine 100 according to an embodiment of the present invention. A construction machine 100 according to the present embodiment is a hydraulic excavator that is a traveling construction machine. A mechanism 103a, 103b, 103c that is provided in 101 and performs various operations, and hydraulic cylinders 104a, 104b, 104c that operate the mechanisms 103a, 103b, 103c are configured. Although not shown, the hydraulic pressure generated in the hydraulic cylinders 104a, 104b, and 104c is generated by driving a hydraulic pump using the engine 90 as a power source, and is controlled by a microcomputer and a hydraulic circuit.

  The mechanism 103a is a mechanism that rotatably supports the boom with respect to the upper swing body 101, and the position (movement) of the boom 109 with respect to the upper swing body 101 is controlled by the hydraulic pressure of the hydraulic cylinder (boom cylinder) 104a. . The mechanism 103b is a mechanism that rotatably supports the arm 108 with respect to the boom 109, and the position (movement) of the arm 108 with respect to the boom 109 is controlled by the hydraulic pressure of the hydraulic cylinder (arm cylinder) 104b. The mechanism 103c is a mechanism that rotatably supports the bucket 106 with respect to the arm 108. The position (movement) of the bucket 106 with respect to the arm 108 is controlled by the hydraulic pressure of the hydraulic cylinder (bucket cylinder) 104c. Note that the mechanisms 103a, 103b, and 103c are not necessarily the above-described rotation mechanism, and may be an expansion / contraction mechanism (slide mechanism) or a combination mechanism thereof.

  FIG. 2 is a front view showing an overall configuration of an example of the cooling system structure 1 of the construction machine 100 according to the present invention, and FIG. 3 is a side view showing the cooling system structure 1.

  The cooling system structure 1 is disposed in the engine room 110 (see FIG. 1) of the construction machine 100. As shown in FIGS. 2 and 3, the cooling system structure 1 includes an engine cooling radiator 10 and an air conditioner capacitor 30 as main components. The radiator 10 and the capacitor 30 have a rectangular plate shape as a whole, and are arranged so that their surfaces are parallel to each other. A fan 80 (see FIG. 7) driven by the engine 90 is disposed behind the radiator 10. As is known, when the fan 80 is rotated by the engine 90, air passes through the condenser 30 and the radiator 10, whereby the cooling function of the condenser 30 and the radiator 10 is expressed.

  Between the radiator 10 and the capacitor 30, a dust-proof net (filter) 50 that prevents foreign matter from entering the radiator 10 is disposed. As shown in FIG. 2, the dust net 50 may be disposed so as to cover substantially the entire surface of the radiator 10. In the example shown in the figure, there are two dustproof nets 50, which are respectively attached to the radiator 10 side by the fixtures 51 at the four corners. In the illustrated example, the dustproof net 50 is disposed so as to contact the surface of the radiator 10. However, the dustproof net 50 may be disposed away from the surface of the radiator 10 as long as it is between the radiator 10 and the capacitor 30. Good.

  A flexible sheet 70 is provided on the outer periphery of the capacitor 30. As shown in FIG. 3, the flexible sheet 70 extends from the outer periphery of the capacitor 30 toward the dust-proof net 50. The flexible sheet 70 is cantilevered on the outer periphery of the capacitor 30, and the end on the dustproof net 50 side forms a free end protruding from the outer periphery of the capacitor 30. The flexible sheet 70 is formed of a soft flexible material such as rubber, silicon, or soft resin. The flexible sheet 70 is preferably provided over substantially the entire circumference of the outer peripheral portion of the capacitor 30 (for example, the entire circumference excluding only the corner portion). The function of the flexible sheet 70 will be described in detail later.

  FIG. 4 is a perspective view illustrating an example of the flexible sheet 70. A flexible sheet 70 shown in FIG. 4 is provided on one side (for example, the upper side) of the outer peripheral portion of the capacitor 30. Therefore, when the flexible sheet 70 is provided on substantially the entire circumference of the outer peripheral portion of the capacitor 30, four similar flexible sheets 70 are prepared. However, when the flexible sheet 70 is provided on substantially the entire circumference of the outer peripheral portion of the capacitor 30, two flexible sheets 70 may be prepared in an L-shaped form, closed form, or open. One shape may be prepared in the form of a rectangle (a rectangle corresponding to the outer shape of the capacitor 30).

  As shown in FIG. 4, the flexible sheet 70 may have a hole 70 b used for attachment to the bracket 31 on the capacitor 30 side. The flexible sheet 70 may have a width W corresponding to each side of the outer peripheral portion of the capacitor 30. The flexible sheet 70 has such a length W that the end portion 70a on the dust-proof net 50 side is just in contact with the dust-proof net 50 in a state where the flexible sheet 70 is attached and is not bent. You may have.

  FIG. 5 is an enlarged view of the main cross section of the portion X in FIG. FIG. 5 shows only the manner in which the flexible sheet 70 is attached to the upper side of the outer periphery of the capacitor 30, but the manner of attachment to other parts (for example, the lower side and the side) of the outer periphery of the capacitor 30 is the same. It may be.

  As shown in FIG. 5, the flexible sheet 70 is attached to the bracket 31 on the outer peripheral portion of the capacitor 30 with bolts 71. The bolt 71 passes through a hole (not shown) of the plate 72 placed on the flexible sheet 70 and a hole 70b (see FIG. 4) of the flexible sheet 70, and a weld nut on the back side of the bracket 31. 32 may be screwed. The plate 72 forms a seating surface of the head of the bolt 71 and may have the same width as the flexible sheet 70. Alternatively, the plate 72 may be replaced by a washer of a bolt 71 with a washer. The flexible sheet 70 may be attached to the outer peripheral portion of the capacitor 30 in various ways. For example, the flexible sheet 70 may be bonded to the outer peripheral portion of the capacitor 30 with an adhesive or a screw. And a fitting such as a grommet.

  Next, with reference to FIG.6 and FIG.7, the operation | movement and effect of the cooling system structure 1 by a present Example are demonstrated.

  FIG. 6 schematically shows a conventional cooling system structure as a contrast with the cooling system structure 1 according to this embodiment. 7 (A) and 7 (B) show the cooling system structure 1 according to this embodiment, and FIG. 7 (A) schematically shows the state of the flexible sheet 70 and the flow of wind during engine operation. FIG. 7 (B) schematically shows the state of the flexible sheet 70 and the flow of wind when the engine is not in operation. In FIG. 6, FIG. 7 (A) and FIG. 7 (B), the flow of the wind in each cooling system structure is schematically shown by a white arrow, and the magnitude of the arrow schematically represents the magnitude of the air volume. . 7A and 7B, the flexible sheet 70 provided on the side of the outer periphery of the capacitor 30 is omitted for the sake of clarity, and the upper side of the outer periphery of the capacitor 30 is omitted. Only the flexible sheet 70 provided on the lower side is shown.

  In the conventional cooling system structure, as shown in FIG. 6, there is a gap S along the outer periphery of the capacitor between the capacitor and the radiator. Accordingly, when the engine is operating (when the fan is rotating), air (see arrow Y) flowing through the gap S to the radiator is generated, so the flow rate through the condenser is reduced. That is, the pressure loss of the flow path flowing through the condenser to the radiator is significantly larger than the pressure loss of the flow path bypassing the condenser and passing through the gap S to the radiator. This reduces the flow rate of the condenser and impedes the cooling performance of the condenser.

  On the other hand, in the cooling system structure 1 according to the present embodiment, the flexible sheet 70 is provided along the outer peripheral portion of the capacitor 30 between the capacitor 30 and the radiator 10. As shown in FIG. 7A, the flexible sheet 70 is caused by the flow of air (suction force) toward the fan 80 when the engine is operating (when the fan 80 rotates). 70 is configured to extend almost straight toward the dust-proof net 50 against gravity, and the end portion 70 a of the flexible sheet 70 comes into contact with the dust-proof net 50. Therefore, in the cooling system structure 1 according to this embodiment, a gap that can be formed along the outer periphery of the capacitor 30 is closed by the flexible sheet 70 when the engine is operated. This reduces or eliminates the flow rate of air flowing to the radiator 10 through the gap between the condenser 30 and the radiator 10 during engine operation, in contrast to the above-described conventional cooling system structure. Compared with the conventional cooling system structure, the flow rate through the condenser 30 can be increased. Thus, according to the cooling system structure 1 according to the present embodiment, the flexible sheet 70 blocks the flow path that flows from the outside of the outer peripheral portion of the capacitor 30 and flows to the radiator 10. The cooling flow of the condenser 30 can be improved by increasing the flow rate that flows through the radiator 10. As a result, the capacitor 30 can be downsized. In particular, the cooling system structure 1 according to the present embodiment includes a configuration in which the flow rate through the condenser 30 tends to be insufficient, for example, a fan clutch that engages / releases the connection between the engine 90 and the fan 80, and the fan clutch is engaged. This is suitable for a configuration in which the rotation of the fan 80 is insufficient when the fan 30 is not, and a configuration in which the flow rate through the capacitor 30 is likely to be insufficient due to a large offset of the mounting position of the capacitor 30 with respect to the radiator 10.

  Further, in the cooling system structure 1 according to the present embodiment, as described above, even if the gap (distance) between the capacitor 30 and the radiator 10 is increased, the flexible sheet 70 is lengthened by that amount, so that the capacitor Without impeding the cooling performance of 30, it is possible to widen the gap between the condenser 30 and the radiator 10 to improve the cleaning performance.

  Further, in the cooling system structure 1 according to the present embodiment, as shown in FIG. 7B, when the engine is not operated (when the fan 80 is not rotating), the flexible sheet 70 has its flexibility and gravity. Sagging due to. That is, in the cooling system structure 1 according to the present embodiment, a gap is formed between the flexible sheet 70 and the dustproof net 50 without contacting the dustproof net 50 when the engine is not operating. Therefore, in the cooling system structure 1 according to the present embodiment, when removing the dustproof net 50 for replacement of the dustproof net 50 or attaching the cleaned dustproof net 50 or the new dustproof net 50, the flexible sheet 70 does not get in the way, and the workability of the attaching / detaching work of the dustproof net 50 is improved. From this point of view, when the engine is not operated, the flexible sheet 70 provided on the side of the outer periphery of the capacitor 30 is easily provided by the dead weight, so that the flexible sheet 70 is provided on the side of the outer periphery of the capacitor 30. The sheet 70 may be attached with an inclination with respect to the side (substantially vertical direction) of the outer peripheral portion of the capacitor 30. In other words, the flexible sheet 70 provided on the side of the outer peripheral portion of the capacitor 30 may be attached so as to form a C shape when viewed from the front from the left and right (in the view of FIG. 2). In this case, the C shape may be a narrow C shape on the upper side or a wide C shape on the upper side.

  The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above-described embodiments, and various modifications and substitutions can be made to the above-described embodiments without departing from the scope of the present invention. Can be added.

  For example, in the above-described embodiment, the condenser 30 and the radiator 10 are described as an example of the cooler. However, the cooling system structure 1 according to the present embodiment is other than the condenser 30 and the radiator 10 such as an intercooler or an oil cooler. It can also be applied to a cooler. For example, on the outer periphery of the intercooler. A flexible sheet extending toward a similar radiator 10 may be set.

  Further, the cooling system structure 1 according to the present embodiment is a hydraulic excavator, a bulldozer, a wheel loader, or a crawler loader as long as it is a construction machine including an engine and at least two coolers arranged in front and back in front of the engine. It is applicable to any kind of construction machinery including

  In the above-described embodiment, as shown in FIGS. 2 and 3, the mounting bracket 34 used for attaching the capacitor 30 to the radiator 10 extends from the outer peripheral portion of the capacitor 30 toward the radiator 10. However, as shown in FIG. 2, since the capacitor 30 has a smaller width than the radiator 10, the mounting bracket 34 does not bend immediately from the outer peripheral portion of the capacitor 30 but extends to the vicinity of the side surface of the radiator 10 and then bends. is doing. Therefore, the mounting bracket 34 cannot perform the function of the flexible sheet 70 provided on the side of the outer peripheral portion of the capacitor 30. Therefore, in the above-described embodiment, as a preferable embodiment, the flexible sheet 70 is also set on the side of the outer peripheral portion of the capacitor 30. However, if the mounting bracket 34 is configured to bend immediately from the outer periphery of the capacitor 30, the function of the flexible sheet 70 provided on the side of the outer periphery of the capacitor 30 can be at least partially achieved. The flexible sheet 70 provided on the side of the outer periphery of the capacitor 30 may be partially or completely omitted. From the same point of view, when the gap between the outer peripheral portion of the capacitor 30 and the radiator 10 is substantially blocked by some member, the flexible sheet 70 may be omitted from the portion. Good.

  In the above-described embodiment, the flexible sheet 70 is caused by the flow of air (suction force) toward the fan 80 when the engine is operating (when the fan 80 rotates). Although the end portion 70a is in contact with the dustproof net 50, the end portion 70a of the flexible sheet 70 is not necessarily in contact with the dustproof net 50, and may be separated by a slight gap. That is, the length of the gap formed between the dust-proof net 50 when the engine is not operating may be reduced by the flexible sheet 70 approaching the dust-proof net 50 when the engine is operating.

It is a figure showing roughly the whole of one example of construction machine 100 by the present invention. 1 is a side view showing an overall configuration of an embodiment of a cooling system structure 1 for a construction machine 100 according to the present invention. 1 is a front view showing an overall configuration of an embodiment of a cooling system structure 1 for a construction machine 100 according to the present invention. 3 is a perspective view showing an example of a flexible sheet 70. FIG. It is an enlarged view of the main cross section of the X section of FIG. It is a figure which shows roughly the conventional cooling system structure as contrast with the cooling system structure 1 by a present Example. FIG. 7A schematically shows the state of the flexible sheet 70 and the flow of wind when the engine is operating, and FIG. 7B shows the state of the flexible sheet 70 and the wind when the engine is not operating. It is a figure which shows a flow typically.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cooling system structure 10 Radiator 30 Capacitor 31 Bracket 50 Dust-proof net 51 Attachment 70 Flexible sheet 70a End part 71 Bolt 72 Plate 80 Fan 90 Engine S Crevice 100 Construction machine 101 Upper turning body 102 Lower traveling body 103a, 103b, 103c Mechanism 104a, 104b, 104c Hydraulic cylinder 106 Bucket 108 Arm 109 Boom 110 Engine room

Claims (5)

A first cooler disposed in the flow path of the cooling air; a second cooler disposed upstream of the cooling air from the first cooler; the first cooler and the second cooling; A construction machine equipped with a dustproof net that is mounted between the containers and prevents foreign matter from entering the first cooler,
A construction machine comprising a flexible sheet attached to an outer periphery of the second cooler and extending from the outer periphery of the second cooler toward the dustproof net.   The construction machine according to claim 1, wherein the flexible sheet has flexibility so as to hang down by its own weight when an engine of the construction machine is not operated.   The flexible sheet is bent downward by its own weight when the engine of the construction machine is not operating, and the end on the dust-proof net side is separated from the dust-proof net with a gap. The construction machine according to claim 1, wherein the construction machine has flexibility so that the downward deflection amount is reduced and the gap is thereby reduced.   The flexible sheet is bent by its own weight when the engine of the construction machine is not operating, and the end portion on the dust-proof net side is separated from the dust-proof net. The construction machine according to claim 3, wherein the construction machine has flexibility such that an end portion on a dustproof net side comes into contact with the dustproof net.   The construction machine according to any one of claims 1 to 4, wherein the flexible sheet is provided over substantially the entire circumference of the outer periphery of the second cooler.

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