JP4451709B2 - Engine hood mounting structure for work machines - Google Patents

Description

  The present invention relates to an engine hood mounting structure for a work machine.

  For example, work machines such as wheel loaders and hydraulic excavators are provided with an engine hood that covers the engine chamber so as to be openable and closable for maintenance / inspection of equipment such as an engine and a radiator in the engine chamber. A typical engine hood is attached to the airframe via a hinge so that the opening / closing operation can be easily performed (see, for example, Patent Document 1).

It is desirable that the engine hood that is opened and closed around the hinge has an open space as large as possible and can be easily opened and closed. However, the hinge for that purpose is likely to be relatively large, and particularly hinders the arrangement of the members of the machine body when downsizing the work machine. Furthermore, since the airframe to which the hinge is attached is usually formed by molding a thin steel plate or plastic or the like, the hinge attachment portion needs to be reinforced. In some cases, it is necessary to prepare a dedicated support member for attaching the hinge to the airframe.
JP 2001-163268 A

  The present invention has been made in view of the above-mentioned facts, and its technical problem is that an engine hood that covers the engine room of the work machine is freely opened and closed, and a special reinforcement is added to the airframe so as not to obstruct the arrangement of members. It is another object of the present invention to provide an engine hood mounting structure for a work machine that can be mounted on a machine body without providing a dedicated support member on the machine body.

In order to solve the above technical problem, according to the present invention, there is provided an engine hood mounting structure that freely opens and closes an engine room of a work machine in which an engine is accommodated, and the engine hood is attached to the engine room. A hinge is attached to a support member that supports a radiator of the engine cooling water that is disposed, and the hinge is engageable in the engine hood “fully open state” and is removably fitted into the engagement hole. The hinge includes a pin having a rectangular four-point linkage, two adjacent points of the four-point linkage are positioned at the upper end of the support member, and the other two opposite points are Positioned on the engine hood, the locking hole is formed in a bracket that defines the two points of the engine hood, and the knob having the pin is provided on each of the engine hood and the support member Is provided to a link connecting the two points, the engine hood mounting structure for a working machine, characterized is provided that.

  According to the engine hood mounting structure for a work machine configured in accordance with the present invention, the engine hood is mounted on a support member that supports a radiator of engine cooling water disposed in the engine compartment. Therefore, the engine hood is attached without adding special reinforcement to the fuselage, without providing a dedicated support member for the fuselage frame, and using the space above the engine compartment that does not interfere with the layout of the fuselage components. be able to.

  As is well known, the supporting member for supporting the radiator encloses and supports a radiator having a heavy structure and having a large number of heat-dissipating fins so as not to be firmly damaged by the body frame in the engine room of the work machine. It is a member with the strength to do.

  Hereinafter, an engine hood mounting 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 wheel loader which is a typical work machine.

  Referring to FIG. 1 which is a side view of the wheel loader, the wheel loader denoted as a whole by number 2 is a refraction steering type machine body in which a front machine body 4 and a rear machine body 5 are refractorably coupled, A front wheel device 6 attached to the body 4 and a rear wheel device 7 attached to the rear body 5 are provided. The front body 4 is provided with a lift arm 8 that is freely swingable in the vertical direction, and a bucket 9 that is a work device attached to the tip of the lift arm 8, and the rear body 5 is provided with a driver's seat 10. And an engine compartment 14 located at the rear end.

  The wheel loader 2 of FIG. 1 will be described with reference to FIG. A counterweight 16 is formed and attached to the lower half of the rear end portion of the rear body 5 in the vertical direction, and the engine hood 18 is similarly attached to the upper half of the rear body 5. It is formed to the full size in the left-right width direction and can be freely opened and closed. The engine chamber 14 is formed with its main portion surrounded by the counterweight 16 and the engine hood 18.

  The description will be continued with reference to FIG. 3 which is a sectional view of the engine chamber 14. Inside the engine compartment 14, the engine 20, the fan 22 driven by the engine 20, and the engine coolant radiator through which the air generated by the fan 22 flows in order toward the rear side (left side in FIG. 3) of the rear body 5. 24 is arranged. The radiator 24 is supported by a support 26 that is a support member, and is attached to a frame 28 of the rear body 5.

  The air that has passed through the radiator 24 is discharged out of the engine compartment 14 through the ventilation openings 17 a and 17 b formed in the counterweight 16 and the ventilation openings 19 a and 19 b formed in the engine hood 18.

  Note that the engine 20, the fan 22, the radiator 24, and the like are well known and do not constitute a novel feature of the present invention, and thus description thereof is omitted.

  The engine hood 18 is attached to the upper end portion of the support 26 by a pair of hinges 30 and 32. The members such as the support 26 that support the radiator differ in details such as shape and size depending on the work machine, but basically the radiator is firmly supported by the frame of the airframe so as not to be damaged. In order to configure the present invention, the engine hood may be attached to the upper end of the existing support.

  The support 26 will be described with reference to FIG. 4 which is a front view and FIG. The support 26 includes a pair of side plates 26 a and 26 b extending vertically in the engine compartment 14 and a lateral beam 26 c that integrally connects the side plates 26 a and 26 b at the upper end portions thereof. The radiator 24 is surrounded and supported by the side plates 26a and 26b and the lateral beam 26c.

  The lower ends of the pair of side plates 26a, 26b are respectively provided with bent portions 26d, 26e that are bent away from each other. The bent portions 26d and 26e are respectively attached to brackets 28a and 28b provided on the frame 28 of the fuselage by two bolts 34, respectively.

  Bending portions 26f and 26g that are bent away from each other are formed at the upper ends of the side plates 26a and 26b. A mounting surface F for mounting the pair of hinges 30 and 32 is positioned and formed on each of the bent portions 26f and 26g on the same plane. Each of the attachment surfaces F is provided with two screw holes 36 and nuts 38 attached to the back side thereof.

  Next, the engine hood 18 will be described mainly with reference to FIG. The engine hood 18 is formed by attaching a reinforcing frame 18b to the inner surface of a hood main body 18a formed in a dome shape from a steel plate or plastic. The reinforcing frame 18b is formed by combining pipe materials, and a pair of hinges 30 and 32 are connected to each other. Two pipes 18c and 18d extend in parallel (extend in a direction perpendicular to the paper surface of FIG. 3). A portion 18e is provided.

  The hinges 30 and 32 will be described with reference to FIG. 6, which is an enlarged perspective view of the hinge 32 attached to the attachment surface F of the one side plate 26 b of the support 26 together with FIG. 3. The hinge 30 attached to the attachment surface F of the other side plate 26a is formed as a contrast with substantially the same configuration as the hinge 32. The hinge 32 has a rectangular four-point link mechanism, that is, fulcrums X1 and X2 and opposed fulcrums Y1 and Y2. A link 32c that is movably connected and a link 32d that rotatably connects the fulcrum X2Y2 are provided.

  The bracket 32a is formed by bending a plate material into an L-shaped cross section. X1 and X2 are defined on one bent surface, and the other surface is formed as a surface to be placed on the mounting surface F of the support 26. Two bolt holes 40 corresponding to the screw holes 36 are formed. Similarly, the bracket 32b is formed by bending a plate material into an L-shaped cross section, and Y1 and Y2 are defined on one surface, and two bolt holes 42 corresponding to the hinge mounting portion 18e of the engine hood 18 are formed on the other surface. ing.

  The bracket 32b is provided with a locking hole 44 in the defined surface of Y1 and Y2, and the link 32d is provided with a knob 46 having a pin that can be removably inserted into the locking hole 44. The locking hole 44 and the pin of the knob 46 are defined such that they can be engaged in the engine hood 18 “fully open state” described later.

  As shown in FIG. 3, one bracket 32 a is attached to the attachment surface F of the support 26 by a bolt 48, and the other bracket 32 b is attached to the hinge attachment portion 18 e of the engine hood 18 by a bolt 50. The other hinge 30 is similarly attached. Thus, the two adjacent points X1 and X2 of the four-point link mechanism are positioned on the mounting surface F side of the upper end portion of the bracket 26, and the two opposite points Y1 and Y2 are positioned on the hinge mounting portion 18e side of the engine hood 18. It is done.

  With reference to FIG. 7 which is an explanatory view of the open / close state of the engine hood together with FIG. 3, the operation of the engine hood mounting structure of the work machine as described above will be described.

Open / close operation:
The engine hood 18 attached to the support 26 which is a support member of the radiator 24 by the hinges 30 and 32 closed the engine chamber 18 shown by a solid line in FIG. 7 by the action of the hinges 30 and 32 having a four-point link mechanism. It is opened and closed between the “closed state” and the “fully open state” indicated by a two-dot chain line. The alternate long and short dash line indicates a “half-open state” along the way.

  The engine hood 18 in the “closed state” abuts the upper surface of the counterweight 16 via an elastic seal 52 attached to the edge of the hood main body 18 a, and the position of the “closed state” is fixed by a lockable latch 54. . In the engine hood 18 in the “fully opened state” indicated by the two-dot chain line, the pin of the knob 46 provided in the hinge 32 is fitted into the locking hole 44 and the “fully opened state” is maintained.

Solving the challenges:
Since the engine hood 18 is attached to a support 26 that is a support member that supports a radiator 24 of engine cooling water disposed in the engine compartment 14, the engine hood 18 is attached to the body with special reinforcement. It can be attached without adding, without providing a dedicated support member for the airframe, and using the space above the engine compartment 14 that does not interfere with the arrangement of the airframe members.

4-point linkage hinge:
In particular, by adopting a rectangular four-point link mechanism for the hinges 30 and 32, the engine hood 18 can be effectively opened greatly by effectively utilizing the upper space in the engine compartment 14.

The side view of the wheel loader which is a typical example of the working machine provided with the engine hood attachment structure comprised according to this invention. The enlarged rear view which looked at the part of the engine room from the back of the wheel loader in the AA arrow direction of FIG. The expanded sectional view of the engine room seen in the BB arrow direction of FIG. The partial front view seen in the CC arrow direction of FIG. The partial top view seen in the DD arrow direction of FIG. The perspective view of the hinge seen in the arrow E direction of FIG. Explanatory drawing of the open / close state of an engine hood.

Explanation of symbols

2: Wheel loader (work machine)
14: Engine compartment 18: Engine hood 20: Engine 24: Radiator 26: Support (supporting member)
30, 32: Hinge

Claims (1)

An engine hood mounting structure for freely opening and closing an engine room of a work machine in which an engine is accommodated,
The engine hood is attached by a hinge to a support member that supports a radiator of engine coolant disposed in the engine compartment,
The hinge includes a knob having a locking hole engageable in the engine hood “fully open state” and a pin that is removably fitted in the locking hole ;
The hinge includes a rectangular four-point link mechanism, two adjacent points of the four-point link mechanism are positioned at the upper end of the support member, and the other two opposite points are positioned at the engine hood.
The locking hole is formed in a bracket that defines the two points of the engine hood,
The knob having the pin is provided in a link connecting two points of the engine hood and the support member ,
An engine hood mounting structure for a working machine.

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