KR20070025996A - Working machine - Google Patents

Abstract

A working machine is provided to enlarge the opening angle of the engine cover and improve the repair work of the engine by installing the linear and V shaped guide parts at the stay guide. A working machine comprises a frame installed with a working apparatus; an engine mounted on the frame; a cover(8) installed with an opening part(9) at the upper side; an engine cover(14) mounted on the cover to be opened and closed; a door opening holding unit(21) placed between the structure cover and the engine cover. The door opening holding unit has a stay(22) erected to draw the circular moving track, and a stay guide(27) guiding the front end of the stay. The stay guide has a linear shaped guide part(28A) guiding the front end of the stay like a linear shape according to the opening angle of the engine cover, and a V shaped guide part(28B) guiding the front end of the stay.

Description

Working machine {WORKING MACHINE}

1 is an overall view showing a hydraulic excavator according to an embodiment of the present invention.

Fig. 2 is a plan view of the upper swing structure in Fig. 1 seen from above.

3 is an enlarged perspective view of the rear portion side of the upper swing structure;

Fig. 4 is a sectional view of the opening of the structure cover, the engine cover, and the like as seen from arrow IV-IV in Fig. 2;

FIG. 5 is an enlarged cross-sectional view of the engine cover and the door opening holding mechanism in FIG. 4; FIG.

FIG. 6 is a cross-sectional view showing a state in which the engine cover in FIG. 5 is opened to a maximum door opening position; FIG.

FIG. 7 is an operation explanatory diagram showing an enlarged view of the door opening and holding mechanism in FIG. 6; FIG.

Fig. 8 is a sectional view showing a state in which the engine cover is opened to the door opening holding position.

FIG. 9 is an operation explanatory diagram showing an enlarged view of the door opening and holding mechanism in FIG. 8; FIG.

Fig. 10 is an exploded perspective view showing the stay and the stay guide of the door opening holding mechanism.

FIG. 11 is a front view showing the stay guide in FIG. 10; FIG.

<Explanation of symbols for the main parts of the drawings>

1: hydraulic shovel (working machine)

2: undercarriage

3: upper pivot

4: working device

5: turning frame (frame)

6: cap

7: counterweight

8: Structure Cover

8A: Side Cover

8B: Top Cover

9: opening

10: engine

11: heat exchanger

12: cooling fan

13: hydraulic pump

14: engine cover

16: hinge

17: sealing member

18: handle

21: door opening holding mechanism (door opening holding means)

22: Stay

23: pivot attachment part (base end side)

24: step roller (tip end side)

25: moving trajectory

26: bracket

27: Stay guide

28: guide hole

28A: straight guide portion

28B: V-shaped guide part

28B1: first bend

28B2: second bend

[Document 1] Japanese Unexamined Patent Publication No. 2001-180526

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a working machine suitably used as a construction machine such as a hydraulic excavator, a crane, a wheel loader, a forklift or a conveying machine, and the like, in particular, a work having a structure cover for accommodating a power source such as an engine. It's about machines.

In general, in a working machine (construction machine) such as a hydraulic excavator, a structure cover is provided on a frame of a vehicle body, and the structure cover divides a machine room inside which accommodates a power source such as an engine. In addition, an opening for inspection is provided on the upper part of the structure cover to maintain and inspect the engine in the machine room, and the opening is covered by an engine cover (bonnet) so as to be openable and closed (for example, refer to Patent Document 1). ).

In addition, a slide bar (stay) and a slide rail (stay guide) are installed between the engine cover and the structure cover to maintain the engine cover in an open state (door open state). The slide bar is slidably displaced from one side to the other side along the slide rails.

A locking portion for locking the slide bar is provided on the other side of the slide rail. When the engine cover is held in the door open state, the driver grips the slide bar and manually engages the locking portion of the slide rail. As a result, the engine cover is maintained (fixed) in the door open state.

[Patent Document 1]

Japanese Patent Laid-Open No. 2001-180526

By the way, in the above-mentioned prior art, it is only the structure which keeps an engine cover in a door open state by locking a slide bar to the latching part provided in the edge part of a slide rail, and opens the engine cover opening angle (door opening angle). The problem is that it cannot be set at a sufficiently large angle.

That is, construction machines such as hydraulic excavators are required to be compactly formed with the vehicle width as small as possible due to recent road conditions. As a result, the width dimension of the structure cover is also limited to a small extent, and the inspection opening provided in the structure cover also inevitably becomes small.

For this reason, the engine cover which opens and closes the inspection opening has an engine cover in terms of servicing and inspecting the engine in the structure cover, unless the opening angle (door opening angle) is set to a sufficiently large angle and kept in the door opening state. There exists a problem that it may interfere, and workability | operativity at the time of maintenance falls.

In addition, in the prior art, it is necessary to manually engage the slide bar with respect to the locking portion provided on the other side of the slide rail when the engine cover is held in the door open state, so it is troublesome to keep the engine cover in the door open state. There is a problem that the burden on the driver increases as a result.

That is, the driver needs to grip the slide bar with the other hand and manually engage the locking portion of the slide rail while opening the engine cover with one hand when opening the engine door. The cover cannot be kept open.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to provide a working machine which can keep the engine cover in an open state by only one hand operation, thereby reliably reducing the burden on the driver. There is.

In addition, another object of the present invention is to increase the opening angle when the engine cover is kept in the open state of the door, thereby stably maintaining and inspecting the engine and the like accommodated in the structure cover and reducing the burden on the driver. It is to provide a working machine that can be made to improve workability during maintenance.

In order to solve the above problems, the present invention is divided into a frame of a vehicle body on which a work device is installed, an engine mounted on the frame, and a machine room standing up on the frame to accommodate the engine therein. A structure cover provided with an opening for inspecting the engine, an engine cover installed on the structure cover so as to cover the opening of the structure cover, and installed between the structure cover and the engine cover, and the engine cover opened upwards. It is applied to the working machine provided with the door opening holding means which keeps the said engine cover in the door open state at the time.

In addition, a feature of the configuration employed in the invention of claim 1 is that the proximal end side is rotatably installed on the structure cover, and the distal end side follows the opening and closing operation of the engine cover, and the arc-shaped movement trajectory is formed. And a stay guide installed on the engine cover and guided to guide the tip side of the stay with opening and closing operation of the engine cover, wherein the stay guide opens the engine cover from the door closing position. When opening to the position, the linear guide portion for guiding the tip end side of the stay in a straight shape from one side in the longitudinal direction to the other side in accordance with the opening angle of the engine cover, and V-shaped at the other side position of the linear guide portion Doors that are formed to form a maximum opening angle of the engine cover to the maximum It is set as the structure which has the V-shaped guide part which guides the front-end | tip part side of the said stay to room position, and walks and locks in the locked state by the weight of the said engine cover.

In addition, according to the invention of claim 2, the V-shaped guide portion of the stay guide is further adapted to guide the tip end side of the stay from the other side position of the straight guide portion to the maximum door opening position of the engine cover. The first bent portion which is bent and extended in accordance with the movement trajectory drawn by the tip end side of the stay from the side position; The tip end side of the structure is constituted by a second bent part that is locked in a locked state.

According to the invention of claim 3, when the engine cover is opened to the maximum door opening position, the center of gravity of the engine cover is lower than the V-shaped guide portion of the stay guide so as to move in the door closing direction by its own weight. It is set as the structure arrange | positioned at a position.

EMBODIMENT OF THE INVENTION Hereinafter, the case where the working machine which concerns on embodiment of this invention is applied to a hydraulic excavator is demonstrated in detail according to attached drawing as an example.

1 to 11 show a first embodiment of the present invention. In the figure, reference numeral 1 denotes a hydraulic excavator as a working machine, and the hydraulic excavator 1 includes a crawler type lower traveling body 2 which is self-propelled as shown in FIG. 1, and the lower traveling body 2. The upper swing body 3 rotatably mounted on the head), and a work device provided to be buoyable in front of the upper swing body 3 for excavation work such as earth and sand, for example. It is comprised substantially by (4).

In this case, the upper swing body 3 of the hydraulic excavator 1 constitutes the vehicle body of the working machine together with the lower traveling body 2. The upper swing body 3 is constituted by a swing frame 5, a cap 6, a counterweight 7, a structure cover 8, an engine 10, an engine cover 14, and the like described later. In addition, the vehicle width of the upper swing body 3 is set to the dimension W shown in FIG. 2, and the structure cover 8 mentioned later is formed small and compact in the range of this dimension W. As shown in FIG.

Reference numeral 5 denotes a swing frame constituting the support structure (frame) of the upper swing body 3, and the swing frame 5 is provided with a work device 4 on the front side so as to be able to float but not on the rear side. The counterweight 7 is provided.

Reference numeral 6 denotes a cap which becomes a driver's boarding portion disposed on the front left side of the turning frame 5, and the cap 6 partitions the cab therein, and the driver's seat, the operation lever, and the operation pedal (all of which are seated). And the like, not shown).

Reference numeral 7 denotes a counterweight provided on the rear end side of the revolving frame 5, and the counterweight 7 is detachably mounted on the rear end side of the revolving frame 5, and is attached to the work device 4 on the front side. The weight balance of the entire upper swing structure 3 is taken. In addition, the front cover of the counterweight (7) is provided with a structure cover (8) for accommodating the engine 10 and the like to be described later. And the upper surface 7A of the counterweight 7 is arrange | positioned on substantially the same surface (height position) as the upper cover 8B mentioned later as shown in FIG.

Reference numeral 8 denotes a structure cover which is located between the cap 6 and the counterweight 7 and is erected on the turning frame 5, and the structure cover 8 is formed of a steel plate or the like as shown in FIGS. It is formed using a plurality of metal panels, and the machine room is partitioned therein. The structure cover 8 is composed of side covers 8A and 8A standing upright on both the left and right sides of the revolving frame 5, and an upper cover 8B provided on the upper side of each side cover 8A and the like. .

Reference numeral 9 denotes an opening serving as an inspection opening provided in the upper cover 8B of the structure cover 8, and the opening 9 indicates an engine when the engine 10 or the like described later as shown in FIG. 4 is to be inspected from above. It is opened and closed via the cover 14. And the opening part 9 is formed in the front side of the counterweight 7, and is formed as a substantially rectangular angled hole extended in the front-back direction and the left-right direction of the upper cover 8B.

Here, the opening portion 9 is disposed offset to one side (left side in FIG. 4) in the left and right directions with respect to the center position of the upper cover 8B, and the heat exchanger 11 and the cooling fan 12 of the engine 10 described later. It is formed so that maintenance, inspection, etc. of a) etc. can be advantageously performed from upper direction. And this opening part 9 is covered by the engine cover 14 mentioned later so that opening and closing is possible from the upper side.

Reference numeral 10 denotes an engine as a prime mover which is located near the counterweight 7 and installed on the rear side of the swing frame 5, the engine 10 having a structure as shown by a two-dot chain line in FIGS. 2 and 4, for example. It is accommodated in the cover 8 (machine room) in the transverse state, and extends in the structure cover 8 in the left-right direction. On the one side of the engine 10, a heat exchanger 11 made of a radiator, an oil cooler, etc., a cooling fan 12, and the like are provided, for example. On the other side of the engine 10, a plurality of hydraulic pumps 13 and the like are provided. This is to be placed.

Reference numeral 14 denotes an engine cover that opens and closes the opening 9 of the structure cover 8, and the engine cover 14 includes an upper cover plate part having an approximately rectangular shape as shown in FIGS. 2 to 6 and 8 ( 14A) and the left side plate portion 14B, the right side plate portion 14C, and the left side plate portion 14A, which are positioned on both sides in the left and right directions of the cover plate portion 14A, and are enlarged and opened obliquely downward. It is formed as a relatively flat (shallow depth) cover body that forms a square shape by the front plate portion 14D and the rear plate portion 14E extended and opened diagonally downward.

In this case, the left side plate part 14B of the engine cover 14 is rotatably connected to the upper surface of the structure cover 8 (upper cover 8B) using the hinge 16 etc. whose lower part is mentioned later. . As a result, the engine cover 14 is opened and closed upward with the hinge 16 as the rotational support point. At this time, the right side plate portion 14C becomes a free end and is undulated up and down as shown in FIG.

When the engine cover 14 is closed as shown in Figs. 2 and 3, the left side plate portion 14B, the right side plate portion 14C, the front side plate portion 14D, and the like are described later on the upper surface of the upper cover 8B. And the rear plate portion 14E contacts the upper surface 7A of the counterweight 7 via the sealing member 17 or the like. Thereby, the engine cover 14 of the door closed state prevents foreign substances, such as rain water and dust, from entering the structure cover 8 from the opening 9 of the upper cover 8B.

Here, the engine cover 14 is disposed to be offset to one side (left side in FIGS. 2 to 4) of the upper cover 8B in order to open and close the opening 9 of the structure cover 8. The length (dimensions in the left and right directions) of the engine cover 14 is smaller than, for example, 1/3 to 1/2 as compared with the vehicle width (dimension W) in FIG. 2.

As a result, the weight of the engine cover 14 is reduced, and a driver who performs maintenance work can easily open the engine cover 14 by holding the handle 18 described later. In addition, a locking mechanism (not shown) or the like is provided between the upper cover 8B at the right side plate portion 14C of the engine cover 14, and the locking mechanism is provided in the engine 14 by the opening portion of the structure cover 8. When 9) is closed, the engine cover 14 is kept in the closed state and locked as needed.

On the other hand, a stay guide 27, which will be described later, is fixed between the cover plate portion 14A and the front plate portion 14D of the engine cover 14 by means of welding or the like. When the engine cover 14 is operated to open the door, the engine cover 14 passes through the stay 22 by slidably displacing the stay 22 to be described later along the guide hole 28 of the stay guide 27. After opening up to the maximum door opening position shown in Fig. 6, it is held in the door opening position shown in Fig. 8 by its own weight Wg.

In addition, the center of gravity G (weight center position) of the engine cover 14 is the movement trace 25 mentioned later in the maximum door opening position (position of the opening angle (theta) 1) illustrated in FIG. 6 and FIG. It is a position which becomes slightly outside and is arrange | positioned below the V-shaped guide part 28B of the guide hole 28. FIG. The weight (Gg) of the engine cover 14 acts on the center of gravity (G), and the weight (Wg) of the longitudinal component (Wg1) and the transverse component (Wg2) is shown in FIG. It is decomposed into components in the biaxial direction. For this reason, the engine cover 14 receives a force in the door closing direction by the lateral component Wg2 of the self weight Wg.

Reference numeral 15 denotes a mounting plate for attaching the hinge 16 to the left side plate portion 14B of the engine cover 14, and the mounting plate 15 is shown in FIG. It is formed as shown and fixed to the left side plate part 14B (inner side surface) of the engine cover 14 using means, such as welding. The mounting plate 15 reinforces the left side plate portion 14B of the engine cover 14 from the inside, and firmly installs the hinge 16 described later with respect to the left side plate portion 14B.

Reference numeral 16 denotes a hinge that connects the engine cover 14 to the upper cover 8B of the structure cover 8 so that the engine cover 14 can be opened and closed. These hinges 16 are constituted by, for example, a hinge formed of a hinge or the like. The hinge 16 is rotatably installed between the upper cover 8B of the structure cover 8 and the mounting plate 15 of the engine cover 14 as shown in FIGS. 2 to 6 and 8. This constitutes a support point (rotational center) when opening and closing the engine cover 14.

Reference numeral 17 is a sealing member provided on the lower surface side of the engine cover 14, and the sealing member 17 is the entire lower surface of the engine cover 14 (left plate portion 14B, right plate portion (as shown in Fig. 5). 14C), an upper cover 8B and an upper cover 7A of the counterweight 7 and an engine cover (located on the lower surfaces of the front plate portion 14D and the rear plate portion 14E) located around the opening 9. 14) to seal between.

Reference numeral 18 denotes a handle fixed to the cover plate portion 14A of the engine cover 14, and the handle 18 is attached to the right plate portion 14C of the engine cover 14 as shown in Figs. It is provided in the center part (middle position of the front-back direction) of 14 A of cover board parts in the near position. The driver who performs maintenance work or the like performs a door opening operation by lifting the engine cover 14 and the hinge 16 as a rotational support point while holding the handle 18 with one hand.

Reference numeral 19 is an operating hydraulic tank which is located on the right side of the structure cover 8 and installed on the swing frame 5, as shown in Fig. 2, and the hydraulic oil tank 19 is located on the suction side of the hydraulic pump 13; At the same time, the return oil from the hydraulic actuator (not shown) is refluxed. Further, a fuel tank 20 or the like for supplying fuel to the engine 10 is provided on the front side of the hydraulic oil tank 19.

Reference numeral 21 denotes a door opening holding mechanism as the door opening holding means employed in the present embodiment. The door opening holding mechanism 21 includes a stay 22, a stay guide 27, and the like described later with reference to Figs. The engine cover 14 is locked to the door open holding position shown by the solid line in FIG. The door opening / closing mechanism 21 made up of the stay 22 and the stay guide 27 is located on the front plate portion 14D side of the engine cover 14 so that the upper cover 8B and the engine of the structure cover 8 are located. It is provided between the cover 14.

Reference numeral 22 denotes a stay rotatably installed on the upper cover 8B of the structure cover 8, the stay 22 being an elongated rod-shaped member made of, for example, a steel rod, as shown in FIG. It is formed by bending. And the pivot attachment part 23 is provided in the base end side of the stay 22, This pivot attachment part 23 is rotatably connected to the bracket 26 mentioned later in a fall prevention state. Moreover, the stepped roller 24 which slides (slides) along the guide hole 28 of the stay guide 27 mentioned later is provided in the front end side used as the free end of the stay 22. As shown in FIG.

Here, the stay 22 has an effective length corresponding to the radius R shown in FIGS. 5 to 7, and rotates around the pivot attachment part 23. The tip end side (stepped roller 24) of the stay 22, when the engine cover 14 is opened and closed, as shown in Figs. 5, 6, and 8, follows the radius R in accordance with this. It is up and down to draw a movement trajectory 25 forming an arc shape.

Reference numeral 26 denotes a bracket for rotatably supporting the base end side of the stay 22. The bracket 26 is positioned around the opening 9 (front and rear in the forward direction), and the upper cover 8B of the structure cover 8 is located. ) Is fixed using a bolt or the like. And the bracket 26 is arrange | positioned in the left position closer to the hinge 16 than the stay guide 27 mentioned later, when the engine cover 14 is set to the door closed state as shown in FIG.

In addition, the bracket 26 is arrange | positioned in the position where the pivot attachment part 23 of the stay 22 is spaced to the right by the predetermined dimension L from the hinge 16. FIG. As a result, when the engine cover 14 is opened to the door opening position indicated by the solid line in Fig. 8, the stay 22 moves beyond the upright position (upper position of the bracket 26) to the hinge 16 side. It is arrange | positioned in the state inclined in the reverse direction, and the front end part side (step-type roller 24) of the stay 22 is latched and fixed by self weight with respect to the 2nd bend part 28B2 mentioned later.

Reference numeral 27 is a stay guide provided on the front plate portion 14D side of the engine cover 14, and the stay guide 27 is formed by bending a metal sheet such as steel sheet, for example, as shown in FIG. And a horizontal plate portion 27A and a vertical plate portion 27B extending in the longitudinal direction of the engine cover 14. The guide plate 28 to be described later extends in the vertical plate portion 27B of the stay guide 27, and the bent portions 27C and 27D forming the sunshade are formed at the upper end side of the vertical plate portion 27B. They are bent at different heights.

Here, the stay guide 27 is provided so that the corner side of both may be covered between 14 A of cover plates of the engine cover 14, and 14 D of front plates. That is, in the stay guide 27, the edge portion of the horizontal plate portion 27A is joined to the front plate portion 14D of the engine cover 14 by welding or the like, and the lower surface of the horizontal plate portion 27A is the front plate portion 14D. It is arranged on the same plane (same surface) as the lower surface of the. The vertical plate portion 27B of the stay guide 27 is welded in a state where the bent portions 27C and 27D are abutted against the inner surface (lower surface) of the cover plate portion 14A.

Thereby, the stay guide 27 is fixed in the engine cover 14 so that it may extend substantially parallel along the front plate part 14D. And the stay guide 27 is arrange | positioned in the engine cover 14 so that it may extend toward the right side surface part 14C from the longitudinal direction (left-right direction of a vehicle) intermediate position of the engine cover 14.

Reference numeral 28 is a long guide hole provided in the vertical plate portion 27B of the stay guide 27, the guide hole 28 is installed in the plate thickness direction of the stay guide 27, the length direction of the stay guide 27 It is formed as an elongate hole extending from one side to the other side. In addition, the guide hole 28 has a width dimension substantially corresponding to the stepped roller 24 of the stay 22, and the tip end side (stepped roller 24) of the stay 22 is formed in the guide hole 28. This is to guide the slide in the longitudinal direction.

Here, the guide hole 28 moves the tip end side of the stay 22 from one side in the longitudinal direction to the other side in accordance with the opening angle of the engine cover 14 when opening the engine cover 14 from the door closing position to the door opening position. Since it is a guide, the long straight guide part 28A extended linearly in the longitudinal direction of the stay guide 27, and the V shape formed by bending in V shape in the other side of the said linear guide part 28A. It is comprised by the shape guide part 28B. The V-shaped guide portion 28B guides the tip end side of the stay 22 to the maximum door opening position of the engine cover 14 so as to self-weight Wg of the engine cover 14 (lateral component Wg2). ], The stay 22 is locked in a locked state.

That is, the V-shaped guide portion 28B provided in the guide hole 28 of the stay guide 27 has the engine cover 14 at the tip end side of the stay 22 from the other side position of the linear guide portion 28A. A first bend 28B1 extending and bent along the movement trajectory 25 drawn by the distal end side of the stay 22 from the other side position of the linear guide portion 28A to guide to the maximum door opening position of the The second bent portion, which is bent from the distal end of the first bent portion 28B1 to the radially outward direction of the movement trajectory 25 and the front end side of the stay 22 is locked to the locked state by the weight Wg of the engine cover 14. It consists of 28B2.

In this case, the first bent portion 28B1 constituting the V-shaped guide portion 28B has an angle α (for example, 130 to 130) which becomes an obtuse angle with respect to the linear guide portion 28A as shown in FIG. 140 degrees), and are bent in a substantially "ku" shape. In addition, the second bent portion 28B2 is formed to be bent in a substantially V shape by an angle β (for example, 85 to 95 degrees) that becomes substantially perpendicular to the first bent portion 28B1.

Then, as shown in Figs. 6 and 7, the first bent part 28B1 opens the engine cover 14 to the maximum door opening position (the position of the opening angle θ1). Is smoothly guided along the movement trajectory 25 of the radius R, and when the door opening angle (opening angle θ1) of the engine cover 14 reaches its maximum, the stay 22 opens the door beyond this. The movement in the direction is regulated at the end of the first bent portion 28B1.

In addition, as shown in Fig. 11, the second bent portion 28B2 is formed in a shape bent in an approximately V shape from the end of the first bent portion 28B1, and the movement trajectory 25 with respect to the first bent portion 28B1. Extends radially outward. Then, the second bent portion 28B2 is opened by the driver from the engine cover 14 in a state in which the engine cover 14 is opened to the maximum door opening position (the position of the open angle θ1) shown in solid lines in FIGS. 6 and 7. When the hand is released (releasing the force in the door opening direction), the engine cover 14 allows the engine cover 14 to start to move in the door closing direction by its own weight Wg (the transverse component Wg2), and at the same time the stay 22 As shown in Fig. 8, the tip end side of the bottom end) is guided into the second bent part 28B2 and locked in a locked state.

In this case, the V-shaped guide portion 28B of the guide hole 28 opens the engine cover 14 to the maximum door opening position (the position of the opening angle θ1) illustrated in FIGS. 6 and 7. The engine cover 14 is disposed at a position above the center of gravity G (weight center position). For this reason, this locking fixation state (lock state) can be stably maintained when the tip end side of the stay 22 is fixed to the second bend portion 28B2 from its first bend portion 28B1 by its own weight.

In addition, the guide hole 28 is provided with a large diameter roller inserting portion 28C at a midway position of the linear guide portion 28A. Then, when the stepped roller 24 (see Fig. 10) provided on the tip end side of the stay 22 is provided to be slidable (slide moving) in the guide hole 28, the stepped roller 24 inserts the roller. It is inserted through the cylinder part 28C, and the stepped roller 24 is hold | maintained in the fall prevention state with respect to the guide hole 28 by this.

That is, when assembling (or disassembling) the door opening and holding mechanism 21, the stepped roller 24 is inserted into the roller with the stepped roller 24 positioned at the position of the roller inserting portion 28C. It inserts in the cylinder part 28C (or extracts | eliminates from within the roller insertion part 28C), and performs assembly | attachment (removal) of the stepped roller 24 with respect to the guide hole 28. As shown in FIG.

The hydraulic excavator 1 which concerns on this embodiment has the structure as mentioned above, and the operation | movement is demonstrated next.

First, when the driver who climbs into the cap 6 of the hydraulic excavator 1 operates the start switch and starts the engine 10 in the structure cover 8, the hydraulic pump 13 or the like is driven by the engine 10. Driven. Then, when the driver tilts the operation lever or the like in the cap 6 appropriately, the hydraulic oil from the hydraulic pump 13 causes the hydraulic cylinder of the work device 4, the turning hydraulic motor, or the lower traveling body. It is dispatched to the traveling hydraulic motor (all of which is not shown) etc. of (2), and excavation work, such as earth and sand, is performed.

In addition, when carrying out maintenance and inspection of the engine 10, heat exchanger 11, cooling fan 12, etc. installed in the structure cover 8, the driver grasps the handle 18 with one hand, and lifts it. The door opening operation of the engine cover 14 is performed. In this case, while opening the hinge 16 upward as a rotation support point by operating the engine cover 14 only by one hand, the opening angle θ2 shown by the door opening holding mechanism 21 in solid lines in Figs. The door can be locked (locked) to the door open position.

That is, when the driver opens the engine cover 14 from the door closed position to the door open position by the operation of one hand only, the tip end side (step roller 24) of the stay 22 is provided on the stay guide 27. The guide hole 28 is guided from one side to the other side of the linear guide portion 28A extending linearly in the longitudinal direction thereof, and the stay 22 moves in the radius R shown in FIGS. 5 to 9. The relief operation is performed in accordance with the trajectory 25.

And if the door opening operation of the engine cover 14 is further continued, the front-end | tip part (step roller 24) of the stay 22 will become the 1st of the guide hole 28 (V-shaped guide part 28B). The bend 28B1 is reached, and as shown by the solid line in FIGS. 6 and 7, the tip end side of the stay 22 can be smoothly guided along the movement trajectory 25 by the first bend 28B1. And when the door opening angle of the engine cover 14 became the maximum door opening position of the opening angle (theta) 1, the stay 22 moves to the door opening direction more than this at the edge part of the 1st curved part 28B1. It can be regulated.

Next, in this state (maximum door opening position shown by solid lines in FIGS. 6 and 7), when the driver releases the force in the door opening direction so that the driver releases the engine cover 14 (knob 18), the engine Since the cover 14 starts to move in the door closing direction by its own weight Wg (lateral component Wg2), the tip end side (stepped roller 24) of the stay 22 is shown in Figs. 8 and 9. As shown in the drawing, the first bent part 28B1 is guided into the second bent part 28B2, and the tip end side of the stay 22 can be automatically locked in the second bent part 28B2 in a locked state.

In this case, when the engine cover 14 is opened to the maximum door opening position (the position of the opening angle θ1) illustrated in Figs. 6 and 7, the center of gravity G of the engine cover 14 is moved by the movement trajectory ( It is a position which is slightly outward from 25, and is located below the V-shaped guide portion 28B of the guide hole 28.

For this reason, when the front end side (step roller 24) of the stay 22 is fixed by hanging from the 1st bend part 28B1 to the 2nd bend part 28B2 by own weight, this locking fixed state (locked state) is It can be stably maintained, for example, and eliminates the problem that the door open state (lock state) of the engine cover 14 is accidentally released by an external force such as wind.

In addition, when performing the door opening operation as described above, the engine cover 14 has an angle Δθ (Δθ = θ1-θ2) from the maximum door opening position of the opening angle θ1 to the door opening holding position of the opening angle θ2. Slightly more] However, this angle Δθ can be suppressed at a small angle of, for example, 2 to 3 degrees, and the opening angle θ2 at the door opening holding position is, for example, at a large door opening angle of 74 to 75 degrees. By setting, a large opening angle θ2 can be secured.

Thus, by using the door opening holding mechanism 21 which consists of the stay 22, the stay guide 27, etc., the engine cover 14 is locked to the door opening holding position shown by the two-point lane in FIG. The opening part 9 provided in 8B can be largely opened to the outside. In this state, the opening 9 is used as an inspection window, so that maintenance (maintenance, inspection) work is easily performed on the engine 10, the heat exchanger 11, the cooling fan 12, and the like in the structure cover 8. I can do it.

In particular, when carrying out the desorption work of the dustproof net used for the radiator of the heat exchanger 11, etc., it is necessary to keep the engine cover 14 in the state which opened the door large. However, as described above, since the opening angle θ2 at the door opening holding position can be set to a large door opening angle (for example, 74 to 75 degrees), maintenance performed in the door opening state of the engine cover 14, The inspection (maintenance) operation can be performed with confidence, thereby reducing the burden on the driver involved in the maintenance operation, and improving workability and safety.

In addition, when returning the engine cover 14 to the door opening direction from the door opening holding position shown in FIG. 8 after completion | finish of maintenance work, a driver may slightly rotate the engine cover 14 toward the maximum door opening position with one hand. By lifting, the tip end side of the stay 22 can be moved from the 2nd bend part 28B2 of the guide hole 28 to the 1st bend part 28B1.

At this time, the driver grips the stay 22 with the other hand, and forcibly moves the tip end side of the stay 22 from the first bend portion 28B1 toward the linear guide portion 28A. Can be released, and after that, the tip end side of the stay 22 is slid to one side of the linear guide portion 28A to the door closed position shown by the solid line in FIG. Can be returned.

Thus, according to this embodiment, the guide hole 28 which consists of long linear guide part 28A and V-shaped guide part 28B is provided in the stay guide 27 of the door opening holding mechanism 21, The V-shaped guide portion 28B is bent along the arc-shaped movement trajectory 25 that the first curved portion 28B1 draws from the other side position of the linear guide portion 28A by the tip end side of the stay 22. It is configured to bend as much as possible.

Thereby, when the driver opens the door of the engine cover 14, the front end side of the stay 22 is moved along the movement trajectory 25 to the position (the position of the open angle θ1) at which the door opening angle becomes maximum. It can be guided smoothly, and when the door opening angle becomes the maximum, it can control by the 1st bend part 28B1 that the stay 22 moves to the door opening direction more than this.

And after opening the engine cover 14 to the maximum door opening position, even if a driver removes his hand from the handle 18 of the engine cover 14, the engine cover 14 will close a door by its own weight Wg. By starting to move in the direction, the tip end side of the stay 22 can be fixed to the second bent portion 28B2 of the stay guide 27 (V-shaped guide portion 28B) to fix the movement of the stay 22. At the same time, the engine cover 14 can be locked in a door open state (the position of the open angle θ2) and fixed and held at this time.

Therefore, according to this embodiment, the driver who performs the opening / closing operation of the engine cover 14 can keep the engine cover 14 in the door open state by the operation of only one hand, so as to reliably bear the burden on the driver who performs the door opening operation. I can alleviate it.

The engine cover 14 is held in the door open state by providing V-shaped guide portions 28B (first and second bent portions 28B1 and 28B2) in the guide holes 28 of the stay guide 27. The holding angle θ2 at the time of holding can be enlarged to an angle close to 75 degrees, for example, and the maintenance and inspection (maintenance work) of the engine 10 etc. accommodated in the structure cover 8 can be performed stably. Can be. As a result, the burden on the driver can be reduced, and workability during maintenance can be improved.

In addition, in the said embodiment, the case where the guide hole 28 which consists of the linear guide part 28A and the V-shaped guide part 28B is provided in the stay guide 27 was demonstrated as an example. However, this invention is not limited to this, For example, it is good also as a structure which provides the guide groove, guide rail, guide protrusion, etc. which have substantially the same shape instead of a guide hole.

In addition, in the said embodiment, when opening and closing the engine cover 14 on the upper cover 8B of the structure cover 8, the case where the door opening direction was made into the left-right direction of the vehicle was demonstrated as an example. However, this invention is not limited to this, For example, it is good also as a structure which opens and closes an engine cover upwards in the direction to become back and front of a vehicle.

In addition, in the said embodiment, the hydraulic excavator was demonstrated as an example as a working machine. However, the present invention is not limited to this, and for example, such as a construction machine or a transportation machine such as a hydraulic crane, a wheel loader, a forklift, or the like, an opening configured for opening and closing the inspection cover provided on the upper part of the structure cover may be configured to open and close the engine cover. It is widely applicable to various working machines.

As described above, according to the invention as set forth in claim 1, a long straight guide portion and a V-shaped guide portion are provided in the stay guide of the door-opening holding means, wherein the V-shaped guide portion is the other side of the linear guide portion. Since it is configured to form a V shape at the position, the front end side of the stay can be smoothly guided to the position where the door opening angle of the engine cover is maximized. This can restrict the stay from moving in the door opening direction. When the driver releases the engine cover from the engine cover after opening the engine cover to the maximum door opening position, the engine cover starts to move in the closing direction with its own weight, so that the tip end side of the stay can be locked to the end of the V-shaped guide part. In this case, the movement of the stay can be locked, and at this time, the engine cover can be locked and held by the door open state.

Therefore, the driver who performs the opening / closing operation of the engine cover can keep the engine cover in the open state by the operation of only one hand, and can reliably reduce the burden on the driver. Then, by providing the linear guide portion and the V-shaped guide portion in the stay guide, the opening angle when the engine cover is kept in the door open state can be increased, and maintenance and inspection of the engine or the like accommodated in the structure cover (maintenance maintenance) Work) can be performed stably. Thereby, burden of a driver can be reduced and workability at the time of maintenance can be improved.

In addition, according to the invention of claim 2, the first bent portion extended by bending the V-shaped guide portion provided in the stay guide in accordance with the movement trajectory drawn by the tip end side of the stay from the other side position of the linear guide portion, and the first bent portion. The V-shaped guide part is configured by the first bent part because the second bent part is bent in the radially outward direction of the movement trajectory from the distal end of the and is fixed by the front end side of the stay locked by the weight of the engine cover. The front end side of the stay can be smoothly guided along the movement trajectory to the position where the door opening angle of the cover is maximized, and when the door opening angle is maximum, the stay is moved in the door opening direction more than this. It can regulate by a bend. When the driver releases the engine cover from the engine cover after opening the engine cover to the maximum door opening position, the engine cover starts to move in the door closing direction due to its own weight, so that the tip end side of the stay is moved to the V-shaped guide part. It is possible to lock the movement of the stay by locking the two bent portions, and at the same time, the engine cover can be locked and held in the door open state at this time. In addition, when the engine cover is closed from the door opening position, the end of the stay can be smoothly moved from the second bend to the first bend to release the locked state, and thereafter, the end of the stay is placed at the first bend. The engine cover can be returned to the door closed position by slidingly displacing toward the linear guide portion.

In addition, according to the invention of claim 3, when the engine cover is opened to the maximum door opening position, the center of gravity is disposed at a position lower than the V-shaped guide portion of the stay guide. This locking fixation state (lock state) can be stably maintained when the V-shaped guide part is fixed to the V-shaped guide part by self weight. For example, the door opening state (lock state) of the engine cover is mistaken due to an external force such as wind. Can be prevented from being released. As a result, maintenance and inspection (maintenance) work on engines and the like performed in the open state of the engine cover can be performed with confidence, thereby reducing the burden on the driver accompanying maintenance work, and improving workability and safety. Can be improved.

Claims (3)

A structure cover having an opening at an upper portion by dividing a frame of a vehicle body on which a work device is installed, an engine mounted on the frame, a machine room standing on the frame and accommodating the engine therein, and an opening at an upper portion thereof, and an opening of the structure cover. An engine cover installed to be opened and closed on the structure cover to cover the door, and a door opening holding means installed between the structure cover and the engine cover and maintaining the engine cover in a door open state when the engine cover is opened upward; In the working machine provided, The door opening and holding means includes a stay rotatably installed at the proximal end side of the structure cover and the tip end side being undulated to follow an opening and closing operation of the engine cover to draw an arc of movement, and installed at the engine cover. It is comprised by the stay guide which guides the front-end | tip side of the said stay with opening / closing operation of an engine cover, The stay guide includes a linear guide part for guiding the tip side of the stay in a straight shape from one side in the longitudinal direction to the other side according to the opening angle of the engine cover when opening the engine cover from the door closed position to the door open position. And forming a V shape at the other side position of the linear guide part and guiding the tip end side of the stay to the maximum door opening position at which the opening angle of the engine cover is maximized so as to be locked by the weight of the engine cover. A work machine comprising a configuration having a V-shaped guide portion to be fixed by walking. 2. The position of the other side of the linear guide portion according to claim 1, wherein the V-shaped guide portion of the stay guide guides the tip side of the stay from the other side position of the linear guide portion to the maximum door opening position of the engine cover. A first bend extending from the tip of the stay and the first bend extending from the tip of the stay and the first bend of the stay to be radially outwardly of the moving trajectory and bent by the weight of the engine cover. The working machine which is comprised by the 2nd bending part which side hangs and locks in the locked state. The center of gravity of the engine cover is lower than the V-shaped guide of the stay guide so that the engine cover moves in the door closing direction by its own weight when the engine cover is opened to the maximum door opening position. The working machine which consists of a structure to arrange in a position to become.

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