JP2007112369A - Engine hood opening and holding structure of working machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an engine hood opening and holding structure of a working machine for preventing a stay installed between an engine room and an adjacent room for holding an engine hood of the working machine at an opening position from being heated at high temperatures by the high heat in the engine room and the radiation heat from an engine in a condition in which the engine hood is closed. <P>SOLUTION: In a stay (22) for holding an engine hood (18) at the "opening position" in a freely releasable manner, one end thereof is turnably connected to the engine hood (18), and the other end thereof is movably connected to a guide groove (26) formed in an adjacent room (16) partitioned by a bulkhead (13) from an engine room (12), and the stay (22) at the "closing position" of the engine hood (18) is positioned in the adjacent room (16). <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to an open holding structure for an engine hood that closes an engine chamber of a work machine so as to be freely opened and closed.

A work machine, for example, a hydraulic excavator, includes an engine hood that is rotatably attached to open and close an upper surface of an engine room. A typical engine hood is attached to one side of the upper surface of the engine compartment by a hinge, and the other side is lifted upward and opened around the hinge. The open position of the engine hood is held by a bar-like stay that is passed between the engine hood and the upper surface of the engine room (see, for example, Patent Document 1).

The known stay has one end rotatably connected to the upper surface of the engine chamber by a pin, and the other end is slidably attached to a guide groove formed in the engine hood. The open position is held by engaging the other end of the stay with a notch provided in the guide groove.

When closing the engine hood, the operator manually releases the engagement between the stay and the cut portion of the guide groove so that the engine hood can be freely moved in the closing direction. At this time, the other end of the stay slides freely in the guide groove. The stay in the closed position is positioned in the closed engine compartment of the engine hood.
JP-A-8-254299 (FIG. 2)

The engine hood opening and holding structure of the working machine in the form as described above has the following problems to be solved.

In other words, the engine room of the work machine is heated to a high temperature by the engine with a large work load and large heat generation. Further, the engine room of the work machine has a structure in which the sealing degree is improved in order to suppress the release of engine noise due to the regulation of ambient noise and the like. Further, a heat source such as an exhaust muffler is disposed together in the engine room. Therefore, the engine room of the work machine is in a considerably high temperature state.

On the other hand, the stay that holds the engine hood in the open position is exposed to high temperatures because it is located in the engine compartment with the engine hood closed. Further, the stay is easily heated because it is made of a material such as a steel pipe or a steel bar. In such a state, when the engine hood is opened, the stay is so hot that it is difficult for an operator to touch it with bare hands, so it is difficult to operate the stay at the same position as the engine hood is opened. It is. In addition, when the engine hood is opened, the heated stay may touch the unconscious worker and surprise the worker.

The present invention has been made in view of the above-mentioned facts, and the technical problem is that the stay installed between the engine hood of the work machine and the engine chamber for holding the engine hood in the open position closes the engine hood. The engine hood is not heated to high temperatures due to the high temperature in the engine room or the engine's radiant heat, etc., and at the same time the engine hood is opened, the operator can operate the stay to hold the engine hood in the open position. It is to provide an engine hood opening holding structure.

According to the present invention, as an engine hood opening and holding structure for a work machine that solves the above technical problem, the engine hood that is pivotably attached to open and close the engine room of the work machine is released to the “open position”. The stay is connected to the engine hood so that one end thereof is freely rotatable and the other end is movably connected to a guide groove provided in an adjacent chamber partitioned by a partition wall. An engine hood opening and holding structure for a working machine is provided, wherein a stay is positioned in the adjacent chamber in a hood "closed position".

Preferably, the engine hood includes a bracket projecting from the engine hood, the connecting portion of which is connected to one end of the stay being positioned in the adjacent chamber in the engine hood “closed position”. In addition, the guide groove is formed in the shape of a long hole in the flat plate member, and the other end of the stay is integrally attached to a shaft protruding integrally to be slidably fitted into the guide groove, and a tip portion of this shaft. And a washer for positioning the flat plate member with the stay. The flat plate member has an insertion hole that communicates with the guide groove and allows the washer to be inserted and removed.

Further, the adjacent room has an opening through which the stay enters and exits according to the opening and closing of the engine hood. The adjacent chamber is a pump chamber that houses a hydraulic pump driven by the engine in the engine chamber.

The engine hood opening and holding structure of the work machine configured according to the present invention is such that a stay that freely holds the engine hood that closes the engine chamber so that the engine chamber can be opened and closed freely is released to the engine hood. The other end is movably connected to a guide groove provided in an adjacent chamber partitioned by a partition from the engine chamber, and the stay is positioned in the adjacent chamber in the engine hood “closed position”. Therefore, in the engine hood “closed position”, the stay cannot be heated by the high temperature of the engine room, the radiant heat of the engine, etc., so the operator can operate the stay and hold the engine hood in the open position simultaneously with the engine hood opening. it can.

Hereinafter, an engine hood opening and holding structure of a work machine configured according to the present invention will be described in more detail with reference to the accompanying drawings illustrating a preferred embodiment of a hydraulic excavator that is a typical work machine.

The hydraulic excavator will be described with reference to FIG. The hydraulic excavator generally indicated by reference numeral 2 includes a lower traveling body 4 and an upper revolving body 6 that is rotatably mounted on the lower traveling body 4. The upper swing body 6 is provided with an articulated working device 8 equipped with a bucket 9, an operator cab 10, an engine compartment 12 containing a power source engine, and the like.

The engine compartment 12 will be described with reference to FIG. The engine chamber 12 provided in the upper swing body 6 accommodates equipment such as an engine body 12a, a radiator 12b, an exhaust muffler 12c, a turbocharger 12d, and an air cleaner 12e. A hydraulic pump 14 as a hydraulic power source is directly connected to a power take-out portion (left side in FIG. 6) of the engine body 12a. The hydraulic pump 14 is positioned in a pump chamber 16 that is an adjacent chamber partitioned from the engine chamber 12 by a partition wall 13. The partition wall 13 is a well-known one having a function of a fire wall that isolates the pump chamber 16 and the engine chamber 12 and prevents an unexpected fire due to oil leakage.

The upper surface of the engine room 12 is opened for attaching and detaching the accommodated devices and for maintenance and inspection. The opening is closed by an engine hood 18 that can be opened and closed and can be held in an open position.

With reference to FIG. 1 and FIG. 2, the open holding structure which hold | maintains the engine hood 18 in an open position releasably is demonstrated. The engine hood opening and holding structure 20 includes a stay 22 that freely holds the engine hood 18 in an “open position” (a position indicated by a solid line in FIGS. 1 and 2). The stay 22 has a guide groove 26 formed in a flat plate member 24 provided in a pump chamber 16 having one end pivotable to a bracket 18 a provided in the engine hood 18 and the other end separated from the engine chamber 12 by a partition wall 13. The slide movement is connected to each other freely. The stay 22 is located in the pump chamber 16 in the engine hood “closed position” (position indicated by a two-dot chain line in FIG. 2).

The engine hood 18 is formed in an outwardly convex rectangular concave lid shape that closes the opening on the upper surface of the engine chamber 22, and one side is rotatably attached to the upper surface of the engine chamber 12 by a pair of hinges 18b. The other side is moved up and down to the center and opened and closed. The other side of the hinge 18b of the engine hood 18 is provided with a pair of handles 18c on which an operator hands when opening and closing. An edge seal 18 d formed of synthetic rubber is attached to the periphery of the engine hood 18.

The bracket 18a of the engine hood 18 is provided inside the rectangular edge of the engine hood 18 so as to protrude toward the pump chamber 16, and a connecting portion with the stay 22 is provided in the pump chamber 16 in the engine hood 18 "closed position". (Indicated by a two-dot chain line in FIG. 2).

The stay 22 will be described with reference to FIG. The stay 22 includes a stay main body 22a having ends 28a and 28b obtained by flattening both ends of a straight steel pipe, and a shaft 22b projecting outwardly integrally joined to one end 28a of the stay main body 22a. And a pair of washers 22c, 22c having a diameter d attached to the shaft 22b with a predetermined interval T, and a rubber tube 22d covering substantially the entire length excluding both ends 28a, 28b of the stay body 22a. The flat end portions 28a and 28b are positioned in parallel on the opposite side in the diameter direction of the stay main body 22a. A pin hole 28c is formed in the other end 28b. The length of the stay 22, that is, the length between the pin hole 28 c and the shaft 22 b is determined in accordance with the opening / closing movement of the engine hood 18. The rubber tube 22d is formed of a relatively thin synthetic rubber having heat resistance, weather resistance, chemical resistance, and the like.

The guide groove 26 will be described with reference to FIG. 4 together with FIG. The guide groove 26 is formed in the flat plate member 24 having a thickness t in the shape of an elongated hole having a width W that gradually inclines downward along the partition wall 13 from the hinge 18 b side of the rotation center of the engine hood 18. The end of the guide groove 26 on the hinge 18b side (left end in FIG. 4) is provided with a cut portion 26a in which a long hole is bent downward in a bowl shape. The other end (the right end in FIG. 4) of the guide groove 26 is connected to an insertion hole 26b formed on the upper side, into which a washer 22c (FIG. 3) having a diameter d of the stay 22 can be inserted and removed. In the flat plate member 24, bent portions at both longitudinal ends of a strip-shaped flat plate having a thickness t are fixed to the partition wall 13.

1 to 4 and FIG. 5, attachment of the stay 22, that is, connection of the bracket 18 a of the engine hood 18 and the guide groove 26 of the flat plate member 24 of the pump chamber 16 will be described.

Referring to FIG. 5 (a), the bracket 18a of the engine hood 18 and the end portion 28b of the stay 22 are passed through pins 32 with washers 30 and 30 on both sides of the end portion 28b, and are removed by the cotter pin 34. Stopped and connected.

Referring to FIG. 5 (b), the end portion 28a of the stay 22 has a washer 22c at the tip of the integrated shaft 22b passed through the insertion hole 26b (FIG. 4), and a pair of washers 22c with a spacing T. 22 c straddles the flat plate member 24 having a thickness t and is connected to the guide groove 26. The above-mentioned interval T is defined as a size that allows a flat plate having a thickness t to slide between them.

Thus, the end portion 28b of the stay 22 slides the guide groove 26 (indicated by the arrow Z in FIG. 2) in accordance with the opening / closing movement of the engine hood 18 (indicated by the arrow Y in FIG. 2).

The opening and closing of the engine hood 18 and the operation of the stay 22 will be described mainly with reference to FIGS. When the engine hood 18 is rotated upward about the hinge 18b with its handle 18c in the "open position", the shaft 22b of the end portion 28a of the stay 22 slidingly moving the guide groove 26 is cut into the guide groove 26. By engaging with the portion 26 a, the engine hood 18 is held in the “open position” by the stay 22.

To close the engine hood 18, this engagement is released by further moving the engine hood 18 in the opening direction, and the engine hood 18 is rotated downward to the “closed position”. At this time, the connecting portion of the stay 22 to the bracket 18a of the engine hood 18 is positioned in the pump chamber 16, and the end portion 28a is slidably moved in the guide groove 26 to be positioned on the other end side of the guide groove 26. 16 is completely accommodated (indicated by a two-dot chain line in FIG. 2).

Referring to FIGS. 1, 2, and 5 (b), the pump chamber 16 includes a rectangular opening 36 on the upper surface thereof through which the stay 22 enters and exits according to the opening and closing of the engine hood 18. The opening 36 is formed to a minimum size that allows the stay 22 to move, so that the pump chamber 16 is isolated from the engine chamber 12. In order to make the isolation further sufficient, an elastic sheet 38 (FIG. 5B) made of rubber or the like having a slit that enables the stay 22 to move inside the opening 36 may be attached.

The operational effects of the engine hood opening and holding structure 20 of the working machine as described above will be described.

The engine hood opening and holding structure 20 has a stay 22 that freely closes the engine hood 18 that can open and close the engine chamber 12 in an “open position” so that one end of the stay 22 can freely rotate to the engine hood 18 and the other end of the engine hood 18 Each of the stays 22 is positioned in the adjacent chamber 16 at the “closed position” of the engine hood 18. Therefore, in the “closed position” of the engine hood 18, the stay 22 is not heated by the high temperature of the engine room 12, the radiant heat of the engine, etc. Therefore, the operator operates the stay 22 at the same time as the engine hood 18 is opened. Can be held in the open position.

The engine hood 18 includes a bracket 18 a protruding from the engine hood 18, which is positioned in the adjacent chamber 16 at the engine hood 18 “closed position” at a connecting portion with one end of the stay 22. Therefore, the stay 22 can be reliably positioned in the adjacent chamber 16 in the engine hood 18 “closed position”. Further, by providing the bracket 18a that enters the adjacent chamber 16, the stay 22 may be straight, easy to manufacture, and low in manufacturing cost.

The guide groove 26 is formed in the flat plate member 24 in a long hole shape. The end portion 28 a of the stay 22 includes an integrally projecting shaft 22 b that is slidably fitted in the guide groove 26, and a washer 22 c that is integrally attached to the distal end portion and positions the flat plate member 24 between the stay 22. It has. The flat plate member 24 is provided with an insertion hole 26b that communicates with the guide groove 26 and allows the washer 22c to be inserted and removed. Therefore, the stay 22 can be easily incorporated into the guide groove 26 and securely connected.

The adjacent chamber 16 includes an opening 36 on the upper surface through which the stay 18 enters and exits according to the opening and closing of the engine hood 18. Therefore, the pump chamber 16 is sufficiently isolated from the engine chamber 12 so as not to be affected by heat.

The adjacent chamber 16 is a pump chamber that houses a hydraulic pump 14 that is driven by the engine in the engine chamber 12. Therefore, the engine hood opening and holding structure 20 can be easily installed at low cost without any special modification to a hydraulic excavator or the like that is a well-known working machine including this type of pump chamber.

FIG. 8 is a perspective view of a portion of the engine hood opening holding structure of the work machine configured according to the present invention in an engine hood “open position”, as viewed from the front side of the paper in the direction of arrow D in FIG. 7. The figure which showed the principal part of the engine hood open | release holding | maintenance structure of FIG. 1 seeing from the side of FIG. The (a) front view and (b) side view of a stay. The side view of the flat plate member in which the guide groove was formed. (A) The enlarged view of the connection part of an engine hood and a stay seen in the AA arrow direction of FIG. (B) The enlarged view of the connection part of the guide groove and stay of an adjacent chamber seen in the BB arrow direction of FIG. Sectional drawing of the engine compartment part seen in CC arrow direction of FIG. The side view of the hydraulic excavator as a working machine.

Explanation of symbols

2: Excavator (work machine)
12: Engine room 13: Bulkhead 14: Hydraulic pump 16: Pump room (adjacent room)
18: Engine hood 18a: Bracket 20: Engine hood open holding structure 22: Stay 22b: Shaft 22c: Washer 24: Flat plate member 26: Guide groove 26b: Insertion hole 36: Opening

Claims (5)

The engine hood, which is mounted to freely open and close the engine room of the work machine, is provided with a stay that holds the release freely in the “open position”.
This stay is connected to a guide groove provided in an adjacent chamber partitioned from the engine chamber by a partition wall, one end of which is rotatable to the engine hood, respectively.
The stay is located in this adjacent room in the engine hood "closed position".
An engine hood opening holding structure for a working machine. Engine hood
It has a bracket protruding from the engine hood that positions the connecting part with one end of the stay in the adjacent room in the engine hood "closed position".
2. An engine hood opening and holding structure for a working machine according to claim 1, wherein: A guide groove is formed in the shape of a long hole in the flat plate member,
The other end of the stay
An integrally projecting shaft that slidably fits in the guide groove, and a washer that is integrally attached to the tip of this shaft and positions the flat plate member between the stay,
The flat plate member
It has an insertion hole that communicates with the guide groove and allows this washer to be inserted and removed.
The engine hood opening and holding structure according to claim 1 or 2, wherein: The adjacent room has an opening that allows the stay to enter and exit according to the opening and closing of the engine hood.
The engine hood opening and holding structure according to any one of claims 1 to 3. The adjacent chamber is a pump chamber containing a hydraulic pump driven by the engine in the engine chamber.
The engine hood opening and holding structure according to any one of claims 1 to 4.

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