JP2010159541A - Construction machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a construction machine which can effectively cool an oil tank by a simple structure, and can prevent an excessive increase in the temperature of oil in the oil tank. <P>SOLUTION: In an upper machine 12 of a pile driver 10, an opening 14d formed in an upper portion of an oil tank chamber 14 is covered with a duct member 19. The duct member 19 has an upper air channel A2 which makes the inside and outside of the oil tank chamber 14 communicate with each other; and a lower portion of the oil tank chamber 14 has a lower air channel A1 which makes the inside and outside of the oil tank chamber 14 communicate with each other. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a construction machine that operates by hydraulic pressure, such as a pile driver or a hydraulic excavator, and in particular, an oil tank chamber in which an oil tank storing oil (hydraulic oil) is partitioned separately from an engine chamber. The present invention relates to a cooling structure for an oil tank in a construction machine housed inside the machine.

  In construction machines such as pile drivers and hydraulic excavators, an oil cooler is installed in the radiator section of the engine to suppress the temperature rise of the hydraulic pump driven by the engine and the temperature rise of the oil supplied to the hydraulic cylinder. The cooling air is circulated by the driven cooling fan to cool the oil cooler together with the radiator.

  Further, in the case where the hydraulic pump is housed in the pump chamber partitioned from the engine chamber, a temperature increase in the pump chamber is suppressed by providing a cross-flow fan in the pump chamber and taking in outside air (see, for example, Patent Document 1). .)

JP 2007-211163 A

  However, in order to sufficiently cool the oil even when the outdoor temperature in summer is high, it is necessary to install a large oil cooler, and when the above-mentioned Patent Document 1 is applied to the oil tank chamber, Since a cooling fan is installed in each of the engine room and the oil tank room, the cost increases and the oil tank room becomes large, so that it is difficult to apply to small and medium-sized construction machines with limited space.

  Accordingly, the present invention provides a construction machine that can effectively cool the oil tank by taking outside air into a separate oil tank chamber and can prevent the oil temperature in the oil tank from rising excessively. It is intended to provide.

  In order to achieve the above object, a construction machine according to the present invention is a construction machine provided with an oil tank chamber for storing an oil tank in an upper swing body provided at an upper portion of a lower traveling body, and provided at an upper portion of the oil tank chamber. The opening is covered with a duct member, and an upper air flow path is provided in the duct member for communicating the inside and outside of the oil tank chamber, and the lower air for communicating the inside and outside of the oil tank chamber to the lower portion of the oil tank chamber It is characterized by providing a flow path.

  The opening is provided on a top plate of the oil tank chamber, and the duct member is attached to an upper surface of the top plate on the outer periphery of the opening, and the opening is opened at the center of the mounting plate. An air circulation port that communicates with the portion, a tunnel-shaped cover member that covers the upper side of the air circulation port and that has a side opening on the side surface, the side opening of the cover member, and the air circulation port of the mounting plate Between the upper surface of the mounting plate and a weir plate that forms an air flow path with the lower surface of the top plate of the cover member. An oil supply port for supplying oil to the oil tank and an oil supply lid that closes the oil supply port so as to be openable and closable can be provided, and the duct member is formed on the top surface of the top plate of the oil tank chamber. Install with the part openable and closable It is also possible.

  According to the construction machine of the present invention, when the temperature of the oil rises, the air in the oil tank chamber around the oil tank is heated to rise in the chamber, and is discharged to the outside from the upper upper air flow path. Since the outside air flows into the oil tank chamber from the air flow path, the oil tank can be cooled by the outside air, and the oil temperature can be prevented from rising excessively.

  In addition, since it is only necessary to provide an upper air flow path and a lower air flow path at the top and bottom of the oil tank chamber, the oil tank chamber does not increase in size, and equipment such as a cooling fan is not required and has a simple structure. Thus, a sufficient oil cooling effect can be obtained at low cost.

It is a side view of the oil tank chamber which shows the 1st form example of this invention. It is a top view of an oil tank chamber similarly. It is a bottom view of an oil tank chamber similarly. It is an exploded perspective view of a duct member similarly. It is a principal part side view of a pile driver similarly. It is a top view of a pile driver similarly. It is a side view of a pile driver similarly. It is a side view of the pile driver which shows the 2nd example of the present invention.

  1 to 7 are views showing a first embodiment in which the present invention is applied to a pile driving machine (ground improvement machine). FIG. 1 is a side view of an oil tank chamber, FIG. 2 is a plan view of the oil tank chamber, and FIG. 3 is a bottom view of the oil tank chamber, FIG. 4 is an exploded perspective view of the duct member, FIG. 5 is a side view of the main part of the pile driver, FIG. 6 is a plan view of the pile driver, and FIG. It is.

  The pile driving machine 10 includes a lower traveling body 11 provided with a crawler 11a, and an upper revolving body 12 provided on the lower traveling body 11 so as to be rotatable. It is provided so that it can be undulated. The upper swing body 12 is provided with an oil tank chamber 14 on the right rear side on the main frame 12a, an cab 16 on the right front side, and an engine chamber 15 containing an engine, a hydraulic pump and the like on the left side. Yes.

  The oil tank chamber 14 that houses the oil tank 17 is a box-like shape formed by a top plate 14a and a bottom plate 14b having a rectangular shape in plan view, and a four peripheral wall 14c, and the top plate 14a has a rectangular opening. 14d is provided, and an inspection door 18 is provided on the wall surface outside the vehicle body. Further, a part of the bottom plate 14b of the oil tank chamber 14 is made of a mesh-like plate material having air permeability such as grating, and the lower air that communicates the inside and outside of the oil tank chamber 14 at the lower portion of the oil tank chamber 14. A flow path A1 is formed.

  The opening 14 d is covered with a duct member 19. The duct member 19 covers a mounting plate 19a larger than the opening 14d, an air circulation port 19b that opens to the center of the mounting plate 19a and communicates with the opening, and covers the air circulation port 19b. A flat tunnel-shaped cover member 19d having a side opening 19c on the side surface, and rises upward from the mounting plate 19a between the side opening 19c of the cover member 19d and the air circulation port 19b. Is integrally provided with a weir plate 20 that inclines in the direction of the side opening 19c and forms an air flow path between the upper edge of the inclined portion and the lower surface of the top plate of the cover member 19d. A plurality of bolt holes 19e are provided in the outer peripheral portion of the mounting plate 19a, and the duct member 19 is fixed to the upper surface of the top plate 14a by bolts 21 inserted through the bolt holes 19e. Further, an oil supply port 19f for supplying oil to the oil tank 17 and an oil supply lid 22 for closing the oil supply port 19f are provided at the center of the top plate of the cover member 19d, which is located above the oil supply port 17a of the oil tank 17. The oil supply lid 22 is formed so as to be able to open and close the oil supply port 19f via a hinge 23.

  The opening 14d and the duct member 19 constitute an upper air flow path A2 that communicates the inside and outside of the oil tank chamber 14 at the upper part of the oil tank chamber 14, and the inside of the oil tank chamber 14 and the outside air are the oil tank. The lower part of the chamber 14 communicates with the lower air flow path A1 provided in a part of the bottom plate 14b. In the upper part of the oil tank chamber 14, the opening 14d of the top plate 14a and the air flow of the mounting plate 19a. It is formed in a state where it communicates via an upper air flow path A2 composed of the opening 19b, the air flow path above the barrier plate 20 and the side opening 19c of the cover member 19d.

  In the pile driving machine 10 having the oil tank chamber 14 formed in this way, the temperature of the oil rises by driving a front device such as a hydraulic auger when the outside air temperature is high in summer, and the outer surface temperature of the oil tank 17 is increased. Becomes higher, the air in the oil tank chamber 14 around the oil tank 17 is heated to rise in the chamber, and the upper air flow path A2 including the opening 14d, the air circulation port 19b, the air flow path and the cover member 19d. Since the outside air flows into the oil tank chamber 14 from the lower lower air flow path A1, the oil tank 17 is cooled by the outside air without the hot air being trapped in the oil tank chamber 14. It is possible to prevent the oil temperature from rising excessively.

  Thereby, the temperature rise of the oil tank 17 can be prevented, and the oil can be prevented from overheating even in the hot summer season. Further, since hot air rises in the oil tank chamber 14, the upper air flow path A2 is provided on the top plate 14a of the oil tank chamber 14, so that the hot air can be discharged well from the upper air flow path A2. Can do. Thereby, size reduction of an oil cooler can also be achieved. Further, since the opening 14d is covered with the duct member 19 and the weir plate 20 is provided in the middle of the upper air flow path A2, rainwater can be prevented from flowing into the oil tank chamber 14. In addition, the dam plate 20 can be reinforced by extending a part of the dam plate 20 upward and joining it to the lower surface of the cover member 19d.

  In particular, it is a construction machine in which an oil tank chamber 14 is arranged on a side different from the engine chamber 15 in which the air flow is obtained by a radiator fan in a medium-sized or small pile driver with limited space. Even in the case of the oil tank chamber 14 in which the air flow from the cooling fan cannot be obtained, the outside air can be effectively taken into the oil tank chamber 14, so that no cooling device such as a cooling fan is required, and the oil tank The oil tank 17 can be satisfactorily cooled without increasing the size of the chamber 14.

  FIG. 8 is a side view of an oil tank chamber showing a second embodiment of the present invention. Components that are the same as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. .

  In this embodiment, the protrusion 14e rising upward is continuously provided at the opening edge of the opening 14d formed in the top plate 14a, and the protrusion 14e is provided on the outer edge of the mounting plate 19a of the duct member 19. A cover piece 19g surrounding the outside is provided, and one side edge of the attachment plate 19a is rotatably attached to the top plate 14a via a hinge 24, and a handle 19h is attached to the other side edge of the attachment plate 19a. ing.

  Thus, the duct member 19 is attached to the upper surface of the top plate 14a via the hinge 24, and the opening 14d is covered with the duct member 19 so as to be openable and closable. The structure of the portion can be simplified, and oil supply to the oil tank 17 and filter replacement can be easily performed.

  In addition, this invention is applicable not only to what a pile driving machine is applied like the above-mentioned example but to other construction machines, such as a hydraulic shovel and a bulldozer. Further, the opening of the oil tank chamber may be circular, the duct member may be formed in a cylindrical shape, and the air flow path may be formed by providing an opening in the cylindrical portion. Furthermore, by supporting the oil tank with a frame or the like, the bottom plate of the oil tank chamber can be omitted, and the entire bottom surface of the oil tank chamber can be used as the lower air flow path.

  DESCRIPTION OF SYMBOLS 10 ... Pile driver, 11 ... Lower traveling body, 11a ... Crawler, 12 ... Upper turning body, 12a ... Main frame, 13 ... Leader, 14 ... Oil tank chamber, 14a ... Top plate, 14b ... Bottom plate, 14c ... Four round walls , 14d ... opening, 14e ... projecting piece, 15 ... engine room, 16 ... cab, 17 ... oil tank, 17a ... oil supply port, 18 ... inspection door, 19 ... duct member, 19a ... mounting plate, 19b ... air flow Hole, 19c ... side opening, 19d ... cover member, 19e ... bolt hole, 19f ... oil supply hole, 19g ... cover piece, 19h ... handle, 20 ... weir plate, 21 ... bolt, 22 ... oil cover, 23, 24 ... Hinge, A1 ... lower air flow path, A2 ... upper air flow path

Claims (4)

In a construction machine provided with an oil tank chamber for storing an oil tank in an upper revolving structure provided at an upper portion of the lower traveling body, an opening provided in the upper portion of the oil tank chamber is covered with a duct member, and the duct member A construction machine characterized in that an upper air flow path for communicating the inside and outside of the oil tank chamber is provided, and a lower air flow path for communicating the inside and outside of the oil tank chamber is provided at the lower portion of the oil tank chamber. The opening is provided in a top plate of the oil tank chamber, and the duct member is attached to an upper surface of the top plate on the outer periphery of the opening, and is opened in the center of the mounting plate to the opening. An air circulation port that communicates, a tunnel-shaped cover member that covers the upper side of the air circulation port and has a side opening on a side surface, and between the side opening of the cover member and the air circulation port of the mounting plate The construction machine according to claim 1, further comprising a weir plate that rises upward from the upper surface of the mounting plate and forms an air flow path with the lower surface of the top plate of the cover member. The construction machine according to claim 2, further comprising: an oil supply port for supplying oil to the oil tank; and an oil supply lid for closing the oil supply port so that the oil supply port can be opened and closed. The construction machine according to claim 2, wherein the duct member is attached to an upper surface of the top plate of the oil tank chamber so that the opening can be opened and closed.

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